This disclosure relates to the field of communication technologies.
V2X (Vehicle to Everything) is a vehicle communication technology. Compared with the cellular communication using Uu link, a transmitting device of V2X communicates directly with a receiving device via a sidelink. New Radio (NR) V2X is an important project of 5G Rel-16. Compared with Long Term Evolution (LTE) V2X of Rel-14/Rel-15, NR V2X may support many new scenarios and new services, and may meet higher performance requirements.
Physical channels defined in Rel-16 NR V2X include a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSCCH carries 1st stage sidelink control information (SCI), the 1st stage SCI being mainly used for reserved resource, and the PSSCH carries 2nd stage SCI and transport blocks (TBs), the 2nd stage SCI being mainly used for TB demodulation.
The PSFCH carries sidelink feedback information (which may be referred to as HARQ-ACK). The PSCCH and PSSCH are usually transmitted at the same slot. A PSCCH/PSSCH is/are associated with one or more PSFCH resources according to established rules. After transmitting a PSCCH/PSSCH, a device may receive acknowledgement (ACK)/nonacknowledgement (NACK) on the associated PSFCH resources. NR V2X supports HARQ-ACK feedback for both unicast and groupcast. Groupcast further includes two HARQ-ACK feedback modes: HARQ option 1 and HARQ option 2.
For groupcast with HARQ option 1, only a receiving device within a certain communication range will feed back HARQ-ACK in a NACK-only mode. More specifically, all receiving devices share the same PSFCH resource, that is, they all feed back on the same PSFCH resource, and only feed back (transmit the PSFCH) when NACK, and do not transmit the PSFCH when ACK, and ACK and NACK are distinguished by presence/absence (or strength) of a PSFCH signal. PSFCHs transmitted by multiple devices will produce equidirectional superposition in the same resource, and the transmitting device determines NACK or ACK according to presence/absence (or strength) of the PSFCH signal, and does not know which receiving device transmits NACK.
For groupcast with HARQ option 2, a PSFCH resource used by each receiving device for feeding back ACK/NACK is independent. The receiving device feeds back ACK in correct reception and feeds back NACK in incorrect reception. ACK and NACK are distinguished by different PSFCH sequences (cyclic shifts), and the transmitting device knows which receiving device transmits ACK/NACK.
A resource (time-frequency resource) used in sidelink transmission is located in a certain resource pool. Two operating modes are defined in NR V2X. For NR V2X mode 1, a resource used by a terminal equipment for V2X communication is scheduled or configured by a network device (base station) via an NR Uu link. And for NR V2X mode 2, the terminal equipment may autonomously select time-frequency resources for V2X communication based on a sensing result.
For the autonomous resource selection (mode 2) of Rel-16 NR V2X, the terminal equipment selects and transmits resources based on a sensing result of itself, which may avoid inter-UE interference or conflict to some extent. However, in some cases, conflicts may still occur in resource transmission. Therefore, as enhancement of autonomous resource selection mode 2, inter-UE coordination also becomes one of the research topics in Rel-17 V2X.
It should be noted that the above description of the background is merely provided for clear and complete explanation of this disclosure and for easy understanding by those skilled in the art. And it should not be understood that the above technical solution is known to those skilled in the art as it is described in the background of this disclosure.
However, it was found by the inventors that specific modes of inter-UE coordination are issues that need to be studied and resolved. Current inter-UE coordination solutions may result in unnecessary resource reselection and increase probabilities of occurrence of conflicts, thereby resulting degradation performance of packet reception rate (PRR) of the system.
In order to solve at least one of the above problems, embodiments of this disclosure provide an inter-UE coordination apparatus and method.
According to an aspect of the embodiments of this disclosure, there is provided an inter-UE coordination apparatus, including:
According to another aspect of the embodiments of this disclosure, there is provided an inter-UE coordination method, including:
According to a further aspect of the embodiments of this disclosure, there is provided an inter-UE coordination apparatus, including:
According to still another aspect of the embodiments of this disclosure, there is provided an inter-UE coordination method, including:
According to yet another aspect of the embodiments of this disclosure, there is provided a communication system, including:
An advantage of the embodiments of this disclosure exists in that the terminal equipment determines whether to receive coordination information used to indicate that a conflict occurs in the reserved resource, and/or determines whether to perform resource reselection based on the received coordination information, according to whether the reserved resource is preempted. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
With reference to the following description and drawings, the particular embodiments of this disclosure are disclosed in detail, and the principle of this disclosure and the manners of use are indicated. It should be understood that the scope of the embodiments of this disclosure is not limited thereto. The embodiments of this disclosure contain many alternations, modifications and equivalents within the spirits and scope of the terms of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term “comprises/comprising/including/includes” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
Elements and features depicted in one drawing or embodiment of the invention may be combined with elements and features depicted in one or more additional drawings or embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views and may be used to designate like or similar parts in more than one embodiment.
These and further aspects and features of this disclosure will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the invention may be employed, but it is understood that the invention is not limited correspondingly in scope. Rather, the invention includes all changes, modifications and equivalents coming within the spirit and terms of the appended claims.
In the embodiments of this disclosure, terms “first”, and “second”, etc., are used to differentiate different elements with respect to names, and do not indicate spatial arrangement or temporal orders of these elements, and these elements should not be limited by these terms. Terms “and/or” include any one and all combinations of one or more relevantly listed terms. Terms “contain”, “include” and “have” refer to existence of stated features, elements, components, or assemblies, but do not exclude existence or addition of one or more other features, elements, components, or assemblies.
In the embodiments of this disclosure, single forms “a”, and “the”, etc., include plural forms, and should be understood as “a kind of” or “a type of” in a broad sense, but should not defined as a meaning of “one”; and the term “the” should be understood as including both a single form and a plural form, except specified otherwise. Furthermore, the term “according to” should be understood as “at least partially according to”, the term “based on” should be understood as “at least partially based on”, except specified otherwise.
In the embodiments of this disclosure, the term “communication network” or “wireless communication network” may refer to a network satisfying any one of the following communication standards: long term evolution (LTE), long term evolution-advanced (LTE-A), wideband code division multiple access (WCDMA), and high-speed packet access (HSPA), etc.
And communication between devices in a communication system may be performed according to communication protocols at any stage, which may, for example, include but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G and new radio (NR) in the future, etc., and/or other communication protocols that are currently known or will be developed in the future.
In the embodiments of this disclosure, the term “network device”, for example, refers to a device in a communication system that accesses a user equipment to the communication network and provides services for the user equipment. The network device may include but not limited to the following equipment: a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.
The base station may include but not limited to a node B (NodeB or NB), an evolved node B (eNodeB or eNB), and a 5G base station (gNB), etc. Furthermore, it may include a remote radio head (RRH), a remote radio unit (RRU), a relay, or a low-power node (such as a femto, and a pico, etc.). The term “base station” may include some or all of its functions, and each base station may provide communication coverage for a specific geographical area. And a term “cell” may refer to a base station and/or its coverage area, which may be expressed as a serving cell, and may be a macro cell or a pico cell, depending on a context of the term.
In the embodiments of this disclosure, the term “user equipment (UE)” or “terminal equipment (TE) or terminal device” refers to, for example, an equipment accessing to a communication network and receiving network services via a network device. The terminal equipment may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), or a station, etc.
The terminal equipment may include but not limited to the following devices: a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a hand-held device, a machine-type communication device, a lap-top, a cordless telephone, a smart cell phone, a smart watch, and a digital camera, etc.
For another example, in a scenario of the Internet of Things (IOT), etc., the terminal equipment may also be a machine or a device performing monitoring or measurement. For example, it may include but not limited to a machine-type communication (MTC) terminal, a vehicle mounted communication terminal, a device to device (D2D) terminal, and a machine to machine (M2M) terminal, etc.
Moreover, the term “network side” or “network device side” refers to a side of a network, which may be a base station, and may include one or more network devices described above. The term “user side” or “terminal side” or “terminal equipment side” refers to a side of a user or a terminal, which may be a UE, and may include one or more terminal equipment described above. “Device” may refer to a network device, or may refer to a terminal equipment, unless otherwise specified.
Scenarios in the embodiments of this disclosure shall be described below by way of examples; however, this disclosure is not limited thereto.
In the embodiments of this disclosure, existing services or services that may be implemented in the future may be performed between the network device 101 and the terminal equipment 102, 103. For example, such services may include but not limited to an enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.
It should be noted that
In the embodiments of this disclosure, sidelink transmission may be performed between the two terminal equipment 102, 103. For example, the two terminal equipment 102, 103 may both perform sidelink transmission within the coverage of the network device 101 to implement V2X communications, or both of them may perform sidelink transmission outside the coverage of the network device 101 to implement V2X communications, and it may also be that one terminal equipment 102 is within the coverage of the network device 101 and another terminal equipment 103 is outside the coverage of the network device 101 and perform sidelink transmission to implement V2X communications.
In the embodiments of this disclosure, the terminal equipment(s) 102 and/or 103 may autonomously select sidelink resources (i.e. in mode 2), in which case sidelink transmission may be independent of the network device 101, i.e. the network device 101 is optional. Of course, autonomous selection of sidelink resources (i.e. in mode 2) and allocation of sidelink resources by the network device (i.e. in mode 1) may also be combined in the embodiments of this disclosure, which is not limited in the embodiments of this disclosure.
In LTE V2X and NR V2X, the terminal equipment may obtain sidelink transmission resources in a process of sensing detection plus resource selection, wherein continuous sensing may be performed to obtain occupancy of resources in a resource pool. For example, the terminal equipment may estimate occupancy of resources in a latter period of time (referred to as a selection window) according to occupancy of resources in a former period of time (referred to as a sensing window).
For the autonomous resource selection (mode 2) of Rel-16 NR V2X, the terminal equipment performs resource selection and transmission based on a sensing result of itself, which may avoid inter-UE interference or conflict to some extent. Steps for resource selection may be found in subsection 8.1.4 of TS 38.214 V16.6.0.
Enhancement of autonomous resource selection is introduced into Rel-17 V2X, in which transmission reliability of mode 2 may be improved and transmission latency of mode 2 may be reduced through inter-UE coordination, and the inter-UE coordination has become one of the research topics in Rel-17 V2X. The inter-UE coordination requires inter-UE information exchange, which is referred to as coordination information. The coordination information may be used to enhance resource selection in mode 2. And the coordination information may indicate whether there is a conflict, which may include a resource conflict problem, and a half duplex problem, etc.
The first terminal equipment (equipment A) may receive SCI transmitted by equipment B at resource 1, and may also receive SCI transmitted by equipment C at resource 3. Based on the SCI, equipment A may learn that resource 2 and resource 4 of equipment B and equipment C will conflict in the future, that is, a collision problem or a half duplex problem will occur.
For example, the collision problem may cause equipment A to be unable to correctly receive information transmitted by equipment B at resource 2 (or information transmitted by equipment C at resource 4), and the half duplex problem may cause equipment B to be unable to receive, at a slot where resource 2 is located, information transmitted by equipment C at resource 4, or, may cause equipment C to be unable to receive, at a slot where resource 4 is located, information transmitted by equipment B at resource 2.
Therefore, equipment A transmits coordination information to equipment B before the conflict occurs, notifying equipment B that a conflict will occur in its reserved resource 2. After receiving the coordination information, equipment B performs resource reselection on resource 2, that is, it may select a resource not conflicting with resource 4 for transmission, thereby avoiding conflicts.
However, it was found by the inventors that for sidelink inter-UE coordination, resource reselection performed based on coordination information may be unnecessary and increase probabilities of occurrence of conflicts.
According to existing techniques, equipment A is unable to learn that equipment B has performed reselection on resource 1 and resource 2. Equipment A receives SCI at slot m0, and learns that equipment B has reserved resource 1 and resource 2. Equipment A is only able to transmit coordination information for the reserved resources. It is assumed that equipment A finds before slot t2 that resource 2 will conflict with the resources reserved by equipment C, and equipment A transmits coordination information 2 to equipment B at slot t2 to indicate this conflict. Equipment B has actually completed resource reselection of resource 2 before receiving the coordination information 2.
As equipment B does not transmit on resource 2, the conflict observed by equipment A will not actually occur, and there is no need for equipment B to perform reselection on resource 2 based on coordination information 2. If equipment B still performs resource reselection on resource 2 based on coordination information 2, equipment B actually performs resource reselection and retransmission for a further time, and the reselected resource may conflict with transmission resources of other equipment, thereby leading to data transmission failures of the other equipment.
Addressed to at least one of the above problems, the embodiment of this disclosure provides a solution to avoid unnecessary resource reselection.
In the embodiments of this disclosure, a sidelink shall be described by taking V2X as an example; however, this disclosure is not limited thereto, and it may also be applicable to other scenarios of sidelink transmission than V2X. In the following explanation, without causing confusion, the terms “sidelink” and “V2X” are interchangeable, the terms “PSFCH” and “sidelink feedback channel” are interchangeable, the terms “PSCCH” and “sidelink control channel” or “sidelink control information” are interchangeable, and the terms “PSSCH” and “sidelink data channel” or “sidelink data” are interchangeable.
In addition, transmitting or receiving a PSCCH may be understood as transmitting or receiving sidelink control information carried by the PSCCH, transmitting or receiving a PSSCH may be understood as transmitting or receiving sidelink data carried by the PSSCH, transmitting or receiving a PSFCH may be understood as transmitting or receiving sidelink feedback information carried by the PSFCH, and sidelink transmission (also referred to as sidelink transmitting) may be understood as PSCCH/PSSCH transmission or sidelink data/information transmission.
The embodiment of this disclosure provides an inter-UE coordination method, which shall be described by taking a second terminal equipment (equipment B) as an example.
It should be noted that
In some embodiments, the second terminal equipment may transmit sidelink control information and sidelink data information to the first terminal equipment, and may also transmit sidelink control information and sidelink data information to other terminal equipment. Description shall be given in
The sidelink data information is carried by a physical sidelink shared channel (PSSCH). The sidelink control information (SCI) indicates a reserved resource, which may be reserved by “Frequency resource assignment” and “Time resource assignment” fields (referred to as time-frequency resource fields) of the SCI, or may also be reserved by a “Resource reservation period” field (referred to as a period field) of the SCI.
For example, as shown in
The case where the SCI indicates the reserved resources are described above, and the terminal equipment may perform preemption detection on the reserved resources. Reference may be made to relevant techniques for contents of the preemption detection. The coordination information shall be described below.
In some embodiments, the first terminal equipment (equipment A) may transmit coordination information to the second terminal equipment (equipment B) and/or other terminal equipment (equipment C). The coordination information may indicate whether there exists a conflict or expected conflict, and it may equivalently say that the coordination information may indicate whether equipment B and/or equipment C performs resource reselection.
In the embodiments of this disclosure, according to whether the reserved resources are preempted, the terminal equipment may determine whether to receive the coordination information indicating the reserved resources where conflicts occur, and/or determine whether to perform resource reselection based on the received coordination information.
In some embodiments, when the reserved resources are not preempted, the second terminal equipment (equipment B) determines to receive the coordination information, and when the reserved resources are preempted, it determines to skip receiving the coordination information.
In some embodiments, when the reserved resources are not preempted, the second terminal equipment (equipment B) determines to perform resource reselection based on the received coordination information, and when the reserved resources are preempted, the second terminal equipment (equipment B) determines to skip performing resource reselection based on the received coordination information.
The term “preemption” in the embodiments of this disclosure may be replaced with “reselection”. “Preemption” refers to finding that a resource has been preempted but resource reselection of the preempted resource is not necessarily completed. “Reselection” indicates that resource reselection of a preempted resource has been completed. Equipment B may determine whether to receive the coordination information, and/or whether to perform resource reselection based on received coordination information, according to whether the reserved resources are preempted, or whether the reserved resources are reselected.
In other words, if equipment B has already determined to perform resource reselection on the reserved resources related to the coordination information before receiving the coordination information, equipment B may skip receiving the coordination information, that is, it does not receive the coordination information; or, equipment B may drop the received coordination information. In other words, equipment B receives the coordination information but deems that the coordination information is invalid. Hence, equipment B does not perform resource reselection on the reserved resources related to it based on the coordination information, that is, equipment B skips performing resource reselection based on the received coordination information.
Table 1 schematically illustrates another expression of the above content; however, this disclosure is not limited thereto.
Here, “the reserved resources related to the coordination information” indicates that the coordination information may indicate whether conflicts occur in the reserved resources. Likewise, “the coordination information related to the reserved resources” also indicates that the coordination information may indicate whether conflicts occur in the reserved resources.
For example, as shown in
For another example, as shown in
Therefore, the terminal equipment identifies unnecessary resource reselection based on the preemption detection and skips receiving relevant coordination information or skips performing resource reselection based on the received coordination information, thereby avoiding unnecessary resource reselection, reducing a probabilities of occurrence of conflicts, and improving transmission reliabilities.
How to transmit the coordination information to indicate expected conflicts is not limited in the embodiments of this disclosure. Transmission of the coordination information and occasions of the preemption detection shall be further described below.
In some embodiments, explanation of “before equipment B receives the coordination information” is as follows. Assuming that slot t is a slot at which equipment B receives the coordination information, slot t-d is deemed as before equipment B receives the coordination information, where, d>0. Optionally, d may be equal to 0. In other words, if equipment B determines to perform resource reselection on the reserved resources related to the coordination information at the slot at which it receives the coordination information, equipment B may skip receiving the coordination information, or equipment B may drop the received coordination information.
In this case, equipment B may skip receiving the coordination information at slot t or drop the coordination information received at slot t. Optionally, equipment B may also perform resource reselection solely based on the coordination information, rather than based on preemption. In general, if equipment B determines to perform resource reselection on resource 0 at slot t based on preemption, and also determines to perform resource reselection on resource 0 based on the coordination information at the same slot t, equipment B will not be triggered to perform resource reselection twice, but perform resource reselection once only.
As shown in
Taking resource 1 at slot m1 as an example, taking reserving sufficient processing time for equipment B into account, the coordination information should not be later than slot m1-T3. The processing time may be ensured in the following method, and it may be ensured that the number of PSSCH slots associated with the same PSFCH slot does not exceed the PSFCH period. Assuming that slot m1-K is a slot temporally earlier than slot m1 by
It should be noted that K here is in units of slots and determined by
Therefore, the slot where coordination information 1 is located is t1=m1-a; wherein, a is a smallest integer greater than or equal to K, and slot t1 is a slot containing the PSFCH. According to the above method, it may be determined that coordination information 1 associated with resource 1 is located in slot t1 in
subchannels, and a PSFCH period thereof is
slots, wherein the number of PRBs allocated for the PSFCH in each slot is
and the resource pool includes
subchannels. According to the above method for determining the PSFCH slot where the coordination information is located, at most
PSSCH slots (where reserved resources may possibly be present) will be associated with the same PSFCH slot.
In other words, PRBs within a PSFCH slot are associated with
,
subchannels within
slots. As shown in
For a reserved resource PSSCH, NtypePSFCH·Msubch,slotPSFCH PRBs associated with the PSSCH may be determined according to its starting subchannel; wherein, NtypePSFCH=1; or, NtypePSFCH·Msubch,slotPSFCH PRBs associated with the PSSCH may be determined according to all subchannels included in the PSSCH; wherein, NtypePSFCH−NsubchPSSCH. Furthermore, each PRB may contain NCSPSFCH cyclic shift pairs.
As a PSFCH resource is determined by a PRB and a cyclic shift pair, the number of PSFCH resources with which a PSSCH is associated is RPRB,CSPSFCH=NtypePSFCH·Msubch,slotPSFCH·NCSPSFCH. For a reserved resource PSSCH, a PSFCH resource with an index of (FID)mod RPRB,CSPSFCH is used to carry the coordination information; wherein, PID is a 8-bit physical layer source ID contained in the SCI reserving the resource.
How to indicate an expected conflict is not limited in the embodiments of this disclosure. For example, when there exists an expected conflict, equipment A transmits the PSFCH (coordination information), and when there exists no expected conflict, equipment A does not transmit PSFCH (coordination information). For another example, when there exists an expected conflict, equipment A transmits a PSFCH (coordination information) with a cyclic shift of C0, and when there exists no expected conflict, equipment A transmits a PSFCH (coordination information) with a cyclic shift of C1.
In some embodiments, at a second slot prior to a first time interval of a first slot receiving the coordination information, detecting whether the reserved resource is preempted, wherein the first time interval is greater than or equal to 0.
In some embodiments, there exists a second time interval between the reserved resource and at least one piece of sidelink control information indicating the reserved resource, such as an interval between slot m0 where the sidelink control information indicating reserved resource 1 is located and slot m1 where reserved resource 1 is located shown in
In some embodiments, the second time interval includes a third time interval and a fourth time interval.
The third time interval is a time interval between the reserved resource and a receiving slot of the corresponding coordination information, such as an interval between slot m1 where reserved resource 1 is located and slot t where coordination information 1 is located, as shown in
The third time interval is greater than or equal to a threshold in units of logical slots, for example, the threshold is
In some embodiments, the fourth time interval is determined based on a UE capability or UE implementation.
Taking limitation of processing time into account, transmitting or receiving the coordination information after slot m1-T3 is meaningless, as equipment B has no time to perform resource reselection according to the coordination information. Assuming that resource 0 at slot m0 reserves resource 1 at slot m1, if the coordination information is to be used, a time interval between resource 0 and resource 1 should be at least greater than one threshold; otherwise, the coordination information is unable to be used to perform resource reselection on resource 1.
In some embodiments, in order to utilize inter-UE coordination, equipment B may ensure one minimum time interval (the second time interval) between the reserved resource and at least one piece of SCI reserving the resource during resource selection, wherein the minimum time interval satisfies a requirement of the coordination information for processing time.
More specifically, the minimum time interval consists of two parts, one part is a time interval (the third time interval) between the reserved resource and the coordination information associated therewith, which may be determined in the method for determining a PSFCH as described above, and the other part is a time interval (fourth time interval) between the SCI reserving the resource and the coordination information, which may be determined based on the UE capability or UE implementation.
The coordination information and preemption detection are schematically described above, and whether to receive the coordination information shall be further described below.
Equipment B transmits the SCI at slot m0 of resource 0, the SCI reserving resource 1 and resource 2. Assuming that equipment B does not receive the coordination information at slot t1, equipment B performs preemption detection on reserved resource 1 and reserved resource 2 at slot t. When it detects that reserved resource 2 is not preempted, it determines to receive coordination information 2, and performs resource reselection based on received coordination information 2. When equipment B detects that reserved resource 2 is preempted, it may determine that a conflict occurs in reserved resource 2, and then decide to perform reselection on reserved resource 2. For example, the resource reselection is performed based on a resource reselection method in existing standards, and receiving coordination information 2 is skipped.
As shown in
In some embodiments, a meaning of receiving the coordination information but skipping performing resource reselection based on the received coordination information is dropping the received coordination information. For example, equipment B receives the coordination information but deems that the coordination information is invalid, hence, it does not perform resource reselection on the reserved resource related thereto based on the coordination information.
Based on preemption detection, equipment B determines that there is a need to perform reselection on reserved resource 1. Equipment B may skip receiving coordination information 1 at slot t and perform reselection on resource 1 based on preemption detection, such as performing resource reselection based on a resource reselection method in existing standards; or, equipment B may receive the coordination information but skip performing resource reselection based on the received coordination information, and perform reselection on resource 1 based only on preemption detection; or, equipment B may receive coordination information, perform resource reselection based on the coordination information, and skip performing resource reselection based on preemption detection. That is, when the first time interval (d) is equal to 0, equipment B will not be triggered to perform resource reselection twice, but perform resource reselection only once.
Equipment B does not receive the coordination information at slot t1, detects at slot t=m1-T3 that resource 1 and resource 2 are preempted, and decides to perform reselection on the reserved resources; for example, resource reselection is performed in a resource reselection method in existing standards, and reselected resources are resource 1′ and resource 2′. Equipment B may skip receiving coordination information 2, or, equipment B may receive coordination information 2 but skip performing resource reselection based on received coordination information 2 (receiving coordination information 2 but dropping contents indicated by received coordination information 2).
The above implementation takes preemption detection of some reserved resources at some specific slots as examples. The above operations may be similarly performed in this disclosure in performing preemption detection on other reserved resources at other slots, which is not limited in this disclosure.
In some embodiments, the coordination information may be carried by a physical sidelink feedback channel (PSFCH). For example, when the coordination information is used to indicate reselection, PSFCH resources may be additional configured or preconfigured RB resources, or sequence resources. The sequences here may be determined by such parameters as cyclic shift, etc. For example, the slot where the physical sidelink feedback channel (PSFCH) carrying the coordination information is located is determined according to the above method; however, this disclosure is not limited thereto, and other resources may also be used to carry the coordination information.
In some embodiments, the first terminal equipment is a destination receiving terminal equipment of the second terminal equipment. In some embodiments, the first terminal equipment is not a destination receiving terminal equipment of the second terminal equipment, but the first terminal equipment is a destination receiving terminal equipment of the third terminal equipment. The destination receiving terminal equipment, for example, refers to a receiving equipment that receives PSCCHs/PSSCHs, and this disclosure is not limited thereto.
In some embodiments, the first terminal equipment (equipment A) and the second terminal equipment (equipment B) perform unicast or groupcast or broadcast sidelink communication. That is, the above embodiments may be applicable to any unicast or groupcast or broadcast scenario.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It can be seen from the above embodiments that the equipment performs preemption detection on the reserved resources, and determines whether to receive the coordination information indicating that a conflict occurs in the reserved resources according to whether the reserved resources are preempted, and/or determine whether to perform resource reselection based on the received coordination information. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between receiving coordination information and receiving coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination method, which shall be described from a first terminal equipment. The embodiments of this disclosure may be implemented in combination with the embodiments of the first aspect, or may be implemented separately, with contents identical to those in the embodiments of the first aspect being not going to be described herein any further.
It should be noted that
In some embodiments, in a case where the reserved resource is not reselected by a second terminal equipment, first coordination information is transmitted to the second terminal equipment, and in a case where the reserved resource is reselected by the second terminal equipment, transmitting the first coordination information to the second terminal equipment is skipped.
After receiving the SCI transmitted at resource 1, equipment A will find that resource 1 reserves resource 2′ but does not reserve resource 2, hence, it infers that resource 2 has been reselected by equipment B. As resource 2 has been reselected by equipment B, equipment A may skip transmitting coordination information 2.
Optionally, equipment B finds at slot m1-T3 that resource 2 has not been preempted, and does not perform resource reselection, that is, the SCI of resource 1 still reserves resource 2. After receiving the SCI transmitted at resource 1, equipment A will find that resource 1 still reserves resource 2, hence, equipment A proceeds with transmitting coordination information 2 to equipment B.
Under normal circumstances, resource 1 reserves resource 2. However, equipment B finds at slot m1-T3 that resource 2 is preempted, and performs resource reselection. The reselected resource is resource 2′, causing the SCI of resource 1 to reserve resource 2 no longer, but reserves reselected resource 2′ instead.
After receiving the SCI transmitted at resource 1, equipment A will find that resource 1 reserves resource 2′ but does not reserve resource 2, hence, it infers that resource 2 has been reselected by equipment B. As resource 2 has been reselected by equipment B, equipment A may skip transmitting coordination information 2.
Optionally, equipment B finds at slot m1-T3 that resource 2 has not been preempted, and does not perform resource reselection, that is, the SCI of resource 1 still reserves resource 2. After receiving the SCI transmitted at resource 1, equipment A will find that resource 1 still reserves resource 2, hence, equipment A proceeds with transmitting coordination information 2 to equipment B.
In some embodiments, in the case where the reserved resource is reselected by the second terminal equipment, it is determined that the reserved resource is released, and skipping transmitting to other terminal equipment the second coordination information indicating conflicts occur between other reserved resources and the reserved resource.
In some embodiments, after equipment A determines that a reserved resource is reselected by equipment B, in determining an expected conflict, equipment A deems that the reserved resource is released, that is, it does not treat the reselected resource as a reserved resource. For example, if equipment A finds that a conflict occurs between resource 1 reserved by equipment B and resource 2 reserved by equipment C and determines to transmit coordination information to equipment C to notify of the conflict, but if equipment A finds that resource 1 has been reselected by equipment B, it no longer deems that resource 1 conflicts with resource 2, and therefore does not transmit second coordination information to equipment C.
In some embodiments, the first coordination information and second coordination information are carried by a physical sidelink feedback channel (PSFCH).
In some embodiments, the first terminal equipment and the second terminal equipment perform unicast or groupcast or broadcast sidelink communication. That is, the above embodiments may be applicable to any unicast or groupcast or broadcast scenario.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It can be seen from the above embodiment that equipment determines whether to transmit the coordination information indicating that a conflict occurs in the reserved resources according to whether the reserved resources are selected. Hence, unnecessary transmission of coordination information may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary transmission of coordination information is avoided, thereby avoiding probabilities of occurrence of conflicts, and improving transmission reliabilities. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination method, which shall be described from a first terminal equipment and a second terminal equipment. The embodiments of this disclosure may be implemented in combination with the embodiments of the first and second aspects, or may be implemented separately, with contents identical to those in the embodiments of the first and second aspects being not going to be described herein any further.
It should be noted that
In some embodiments, in a case where the ACK has been received before receiving the coordination information, skipping receiving the coordination information or skipping performing resource reselection based on the received coordination information. In a case where the ACK is not received before receiving the coordination information and the reserved resource is not preempted, determining to receive the coordination information or performing resource reselection based on the received coordination information; and in a case where the ACK is not received before receiving the coordination information and the reserved resource is preempted, determining to skip receiving the coordination information or skip performing resource reselection based on the received coordination information.
In some embodiments, reference may be made to the embodiments of the first aspect for other implementations in which equipment B does not receive the ACK or receives the NACK at slot ta before receiving coordination information 1, which shall not be repeated herein any further.
In some embodiments, the ACK and coordination information are for the same transport block (TB). As equipment B has received the ACK, it will not transmit at the reserved resources related to the coordination information, nor will perform resource reselection on the reserved resources. Therefore, receiving the coordination information or performing resource reselection based on the received coordination information may be skipped. In some embodiments, equipment B actually refers to any equipment that is able to receive the coordination information.
In some embodiments, behaviors of equipment B are used for unicast and groupcast.
In some embodiments, the above behaviors of equipment B are used for unicast and groupcast with HARQ option 2, but not for groupcast with HARQ option 1. This is because the groupcast with HARQ option 1 is groupcast that feeds back NACK only, and equipment B is unable to distinguish between the ACK and DTX. For the DTX, equipment B may actually proceed with receiving the coordination information, and perform resource reselection based on the coordination information.
In some embodiments, the PSFCH indicating the ACK/NACK may reuse the existing standards.
Assuming that equipment A is a receiver of equipment B, after receiving the PSCCH/PSSCH of equipment B, equipment A decides to indicate ACK/NACK and/or reselection to equipment B, and transmits one or more PSFCHs corresponding thereto.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It can be seen from the above embodiment that the equipment receives the acknowledgement (ACK) or the nonacknowledgement (NACK) fed back for the sidelink transmission indicated by the sidelink control information, and determines whether to receive the coordination information indicating that a conflict occurs in the reserved resources or whether to perform resource reselection based on the received coordination information according to whether the acknowledgement (ACK) is received. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination method, which shall be described from a first terminal equipment. The embodiments of this disclosure may be implemented in combination with the embodiments of the first, second and third aspects, or may be implemented separately.
It should be noted that
In some embodiments, in a case where the acknowledgement (ACK) is fed back for sidelink transmission indicated by the sidelink control information, skipping transmitting the first coordination information to the second terminal equipment. In some embodiments, for a reserved resource where the acknowledged (ACK) is transmitted, it is determined that the reserved resource is released, and skipping transmitting the second coordination information indicating that a conflict occurs between other reserved resources and the reserved resource to other terminal equipment.
In some embodiments, for a reserved resource after the ACK is indicated, equipment A deems that the reserved resource is released in determining the expected conflict, that is, it does not treat the reselected resource as a reserved resource.
In some embodiments, as shown in
In some embodiments, the ACK and the first coordination information are for the same TB.
In some embodiments, behaviors of equipment A are used for unicast and groupcast. In some embodiments, the unicast or groupcast refers to that a PSSCH addressed by the ACK belongs to unicast or groupcast. Equipment A is able to learn via the SCI (2nd stage SCI) that the PSSCH belongs to unicast or groupcast, or belongs to groupcast with HARQ option 1 or groupcast with HARQ option 2.
In some embodiments, the above behaviors of equipment A are used for unicast but not for groupcast. This is because for groupcast, equipment B may possibly receive NACK transmitted by other member than equipment A. Hence, equipment B will still perform retransmission at the reserved resource. If equipment A does not transmit coordination information, it may cause equipment A to be unable to correctly receive retransmission from equipment B or equipment C.
In some embodiments, indicating the ACK by equipment A to equipment B refers to that equipment A has determined the ACK and does not drop the ACK according to a priority rule, that is, equipment A has actually transmitted the ACK. For groupcast with HARQ option 1, as equipment A only transmits a PSFCH in NACK and does not transmit a PSFCH in ACK, not transmitting a PSFCH is deemed as indicating the ACK to equipment B.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It can be seen from the above embodiments that the equipment determines whether to feed back acknowledgement (ACK) for sidelink transmission to which the sidelink control information corresponds, and determine whether to transmit the coordination information indicating that a conflict occurs in the reserved resources according to whether the acknowledgement (ACK) is fed back. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination apparatus. The apparatus may be, for example, a terminal equipment (such as the above-described second terminal equipment), or may be one or more components or assemblies configured in a terminal equipment. Contents in this embodiment identical to those in the embodiments of the first to the fourth aspects shall not be described herein any further.
In some embodiments, the transmitting unit 2401 is configured to transmit sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; the preemption detecting unit 2402 is configured to perform preemption detection on the reserved resource; and the processing unit 2403 is configured to determine whether to receive coordination information used to indicate that a conflict occurs in the reserved resource, and/or determine whether to perform resource reselection based on the received coordination information, according to whether the reserved resource is preempted.
In some embodiments, the inter-UE coordination apparatus 2400 may further include a receiving unit 2404 configured to receive coordination information from a first terminal equipment.
In some embodiments, in a case where the reserved resource is not preempted, the processing unit 2403 determines to receive the coordination information, and determines to perform the resource reselection based on the received coordination information, and in a case where the reserved resource is preempted, the processing unit 2403 determines to skip receiving the coordination information or skip performing the resource reselection based on the received coordination information. In the case where the reserved resource is preempted, the processing unit 2403 determines to skip receiving the coordination information or skip performing the resource reselection based on the received coordination information.
In some embodiments, at a second slot prior to a first time interval of a first slot receiving the coordination information, the preemption detecting unit 2402 detects whether the reserved resource is preempted, wherein the first time interval is greater than or equal to 0.
In some embodiments, the reserved resources are indicated by frequency resource assignment and time resource assignment field or a resource reservation period field in the sidelink control information.
In some embodiments, there exists a second time interval between the reserved resource and at least one piece of sidelink control information indicating the reserved resource, and there exists a receiving slot of the coordination information within the second time interval.
In some embodiments, the second time interval includes a third time interval and a fourth time interval. The third time interval is a time interval between the reserved resource and a receiving slot of the corresponding coordination information, and the fourth time interval is an interval between the receiving slot of the coordination information and the sidelink control information indicating the reserved resource. The third time interval is greater than or equal to a threshold in units of logical slots.
In some embodiments, on the premise that the third time interval is satisfied, the receiving slot of the coordination information corresponding to the reserved resource is a slot where a physical sidelink feedback channel is located most close to a slot where the reserved resource is located. In some embodiments, the fourth time interval is determined based on a UE capability or UE implementation.
In some embodiments, the inter-UE coordination apparatus 2400 further includes a receiving unit 2404 configured to receive acknowledgement (ACK) or nonacknowledgement (NACK) fed back for sidelink transmission, and the processing unit 2403 is further configured to determine whether to receive the coordination information, or determine whether to perform the resource reselection based on the received coordination information, according to whether the ACK has been received before the coordination information is received.
In a case where the ACK has been received before the coordination information is received, the processing unit 2403 determines to skip receiving the coordination information or skip performing the resource reselection based on the received coordination information. In a case where the ACK has not been received before the coordination information is received and the reserved resource is not preempted, the processing unit 2403 determines to receive the coordination information or determines to perform the resource reselection based on the received coordination information; and in a case where the ACK has not been received before the coordination information is received and the reserved resource is preempted, the processing unit 2403 determines to skip receiving the coordination information or skip performing the resource reselection based on the received coordination information.
In some embodiments, sidelink transmission indicated by the sidelink control information is of unicast, groupcast or broadcast.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It should be noted that the components or modules related to this disclosure are only described above. However, this disclosure is not limited thereto, and the inter-UE coordination apparatus 2400 may further include other components or modules, and reference may be made to related techniques for particulars of these components or modules.
Furthermore, for the sake of simplicity, connection relationships between the components or modules or signal profiles thereof are only illustrated in
It can be seen from the above embodiment that the equipment performs preemption detection on the reserved resources, and determines whether to receive the coordination information indicating that a conflict occurs in the reserved resources and/or determine whether to perform resource reselection based on the received coordination information according to whether the reserved resources are preempted. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between receiving coordination information and receiving coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination apparatus. The apparatus may be, for example, a terminal equipment (such as the above-described first terminal equipment), or may be one or more components or assemblies configured in a terminal equipment. Contents in this embodiment identical to those in the embodiments of the first to the fifth aspects shall not be described herein any further.
In some embodiments, the receiving unit 2501 receives sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; the determining unit 2502 determines whether the reserved resource is reselected; and the transmitting unit 2503 determines whether to transmit coordination information used to indicate that a conflict occurs in the reserved resource according to whether the reserved resource is reselected.
In some embodiments, in a case where the reserved resource is not reselected by a second terminal equipment, the transmitting unit 2503 transmits first coordination information to the second terminal equipment.
In some embodiments, in a case where the reserved resource is reselected by the second terminal equipment, the transmitting unit 2503 skips transmitting the first coordination information to the second terminal equipment. In some embodiments, in a case where the reserved resource is reselected by the second terminal equipment, the determining unit 2502 determines that the reserved resource is released, and the transmitting unit 2503 skips transmitting second coordination information to other terminal equipment, the second coordination information being used to indicate that other reserved resources conflict with the reserved resource.
In some embodiments, in a case where acknowledgement (ACK) is fed back for sidelink transmission indicated by the sidelink control information from a second terminal equipment, the transmitting unit 2503 skips transmitting first coordination information to the second terminal equipment. In some embodiments, in a case where acknowledgement (ACK) is fed back for sidelink transmission indicated by the sidelink control information from a second terminal equipment, the determining unit 2502 determines that the reserved resource is released, and the transmitting unit 2503 skips transmitting second coordination information used to indicate that other reserved resources conflicts with the reserved resource to other terminal equipment.
In some embodiments, the determining unit 2502 determines whether the reserved resource is reselected at a second slot with a first time interval prior to a first slot at which the coordination information is transmitted, wherein the first time interval is larger than or equal to zero.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It should be noted that the components or modules related to this disclosure are only described above. However, this disclosure is not limited thereto, and the inter-UE coordination apparatus 2500 may further include other components or modules, and reference may be made to related techniques for particulars of these components or modules.
Furthermore, for the sake of simplicity, connection relationships between the components or modules or signal profiles thereof are only illustrated in
It can be seen from the above embodiment that equipment determines whether to transmit the coordination information indicating that a conflict occurs in the reserved resources according to whether the reserved resources are selected. Hence, unnecessary transmission of coordination information may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary transmission of coordination information is avoided, thereby avoiding probabilities of occurrence of conflicts, and improving transmission reliabilities. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination apparatus. The apparatus may be, for example, a terminal equipment (such as the above-described first terminal equipment), or may be one or more components or assemblies configured in a terminal equipment. Contents in this embodiment identical to those in the embodiments of the first to the sixth aspects shall not be described herein any further.
In some embodiments, the transmitting unit 2601 transmits sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; the receiving unit 2602 receives acknowledgement (ACK) or non-acknowledgement (NACK) fed back for the sidelink transmission indicated by the sidelink control information; and the determining unit 2603 determines whether to receive coordination information indicating that a conflict occurs in the reserved resource, or determines whether to perform resource reselection based on the received coordination information, according to whether the acknowledgement (ACK) has been received.
In some embodiments, in a case where ACK has been received before receiving the coordination information, the determining unit 2603 determines to skip receiving the coordination information or to skip performing resource reselection based on the received coordination information.
In some embodiments, in a case where ACK is not received before receiving the coordination information and reserved resources are not preempted, the determining unit 2603 determines to receive the coordination information or perform resource reselection based on the received coordination information; and in a case where the ACK is not received before receiving the coordination information and the reserved resource is preempted, the determining unit 2603 determines to skip receiving the coordination information or skip performing resource reselection based on the received coordination information.
In some embodiments, sidelink transmission indicated by the sidelink control information is of unicast, groupcast or broadcast.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It should be noted that the components or modules related to this disclosure are only described above. However, this disclosure is not limited thereto, and the inter-UE coordination apparatus 2600 may further include other components or modules, and reference may be made to related techniques for particulars of these components or modules.
Furthermore, for the sake of simplicity, connection relationships between the components or modules or signal profiles thereof are only illustrated in
It can be seen from the above embodiment that the equipment receives the acknowledgement (ACK) or the nonacknowledgement (NACK) fed back for the sidelink transmission indicated by the sidelink control information, and determines whether to receive the coordination information indicating that a conflict occurs in the reserved resources or whether to perform resource reselection based on the received coordination information according to whether the acknowledgement (ACK) is received. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides an inter-UE coordination apparatus. The apparatus may be, for example, a terminal equipment (such as the above-described first terminal equipment), or may be one or more components or assemblies configured in a terminal equipment. Contents in this embodiment identical to those in the embodiments of the first to the seventh aspects shall not be described herein any further.
In some embodiments, the receiving unit 2701 receives sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; the determining unit 2702 determines whether to feed back acknowledgement (ACK) for the sidelink transmission to which the sidelink control information corresponds; and the transmitting unit 2703 determines whether to transmit coordination information used to indicate that a conflict occurs in the reserved resource according to whether the acknowledgement (ACK) is fed back.
In some embodiments, in a case where the acknowledgement (ACK) is fed back for sidelink transmission indicated by the sidelink control information, the transmitting unit 2703 skips transmitting the first coordination information to the second terminal equipment.
In some embodiments, for a reserved resource where the acknowledged (ACK) is transmitted, the determining unit 2702 determines that the reserved resource is released, and the transmitting unit 2703 skips transmitting the second coordination information indicating that a conflict occurs between other reserved resources and the reserved resource to other terminal equipment.
The above implementations only illustrate the embodiments of this disclosure. However, this disclosure is not limited thereto, and appropriate variants may be made on the basis of these implementations. For example, the above implementations may be executed separately, or one or more of them may be executed in a combined manner.
It should be noted that the components or modules related to this disclosure are only described above. However, this disclosure is not limited thereto, and the inter-UE coordination apparatus 2700 may further include other components or modules, and reference may be made to related techniques for particulars of these components or modules.
Furthermore, for the sake of simplicity, connection relationships between the components or modules or signal profiles thereof are only illustrated in
It can be seen from the above embodiments that the equipment receives the acknowledgement (ACK) fed back for the sidelink transmission to which the sidelink control information corresponds, and determines whether to transmit the coordination information indicating that a conflict occurs in the reserved resources according to whether the acknowledgement (ACK) is fed back. Hence, unnecessary resource reselection may be avoided, probabilities of occurrence of conflicts may be reduced, and transmission reliabilities may be improved.
On the one hand, unnecessary resource reselection is avoided, thereby avoiding unnecessary conflicts and improving transmission reliability. On the other hand, as the equipment may avoid unnecessary transmission and reception of the coordination information, probabilities of conflicts between receiving and transmitting the coordination information and/or between transmitting coordination information and transmitting coordination information may be reduced.
Specifically, taking that the PSFCHs carry the coordination information an as example, when the equipment needs to transmit the PSFCHs and receive the PSFCHs simultaneously, it will drop PSFCHs with lower priorities and only transmit or receive PSFCHs with higher priorities; when the equipment needs to transmit multiple PSFCHs simultaneously and the number of the PSFCHs exceeds the UE capability, the equipment will drop some PSFCHs with lower priorities and only transmit PSFCHs with higher priorities. When the PSFCHs are used to transmit the coordination information, probabilities of occurrence of conflicts between the above receiving PSFCHs/transmitting PSFCHs and/or between transmitting PSFCHs/transmitting PSFCHs is actually increased. In the embodiments of this disclosure, transmission and reception of some PSFCHs carrying the coordination information may be avoided, hence, probabilities of occurrence of conflicts between receiving PSFCHs/transmitting PSFCHs and/or between transmitting and receiving PSFCHs/transmitting PSFCHs may be reduced to some extent.
The embodiment of this disclosure provides a communication system, and reference may be made to
In some embodiments, the communication system 100 may at least include:
In some embodiments, the communication system 100 may at least include:
In some embodiments, the communication system 100 may at least include:
In some embodiments, the communication system 100 may at least include:
The embodiment of this disclosure further provides a network device, which may be, for example, a base station. However, this disclosure is not limited thereto, and it may also be another network device.
Furthermore, as shown in
The embodiment of this disclosure further provides a terminal equipment; however, this disclosure is not limited thereto, and it may also be another equipment.
For example, the processor 2910 may be configured to execute a program to carry out the inter-UE coordination method as described in the embodiments of the first aspect. For example, the processor 2910 may be configured to perform the following control: transmitting sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; performing preemption detection on the reserved resource; and determining whether to receive coordination information used to indicate that a conflict occurs in the reserved resource, and/or determining whether to perform resource reselection based on the received coordination information, according to whether the reserved resource is preempted. For example, the processor 2910 may be configured to execute a program to carry out the inter-UE coordination method as described in the embodiments of the second aspect. For example, the processor 2910 may be configured to perform the following control: receiving sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; determining whether the reserved resource is reselected; and determining whether to transmit coordination information used to indicate that a conflict occurs in the reserved resource according to whether the reserved resource is reselected.
For example, the processor 2910 may be configured to execute a program to carry out the inter-UE coordination method as described in the embodiments of the third aspect. For example, the processor 2910 may be configured to perform the following control: transmitting sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; receiving acknowledgement (ACK) or non-acknowledgement (NACK) fed back for the sidelink transmission indicated by the sidelink control information; and determining whether to receive coordination information indicating that a conflict occurs in the reserved resource, and/or determining whether to perform resource reselection based on the received coordination information, according to whether the acknowledgement (ACK) has been received.
For example, the processor 2910 may be configured to execute a program to carry out the inter-UE coordination method as described in the embodiments of the fourth aspect. For example, the processor 2910 may be configured to perform the following control: receiving sidelink control information and sidelink data information, the sidelink control information indicating a reserved resource; determining whether to feed back acknowledgement (ACK) for sidelink transmission to which the sidelink control information corresponds; and determining whether to transmit coordination information used to indicate that a conflict occurs in the reserved resource according to whether to feed back acknowledgement (ACK).
As shown in
An embodiment of this disclosure provides a computer readable program, which, when executed in a terminal equipment, will cause the terminal equipment to carry out the inter-UE coordination method as described in the embodiments of the first to the fourth aspects.
An embodiment of this disclosure provides a computer readable medium, including a computer readable program, which will cause a terminal equipment to carry out the inter-UE coordination method as described in the embodiments of the first to the fourth aspects.
The above apparatuses and methods of this disclosure may be implemented by hardware, or by hardware in combination with software. This disclosure relates to such a computer-readable program that when the program is executed by a logic device, the logic device is enabled to carry out the apparatus or components as described above, or to carry out the methods or steps as described above. This disclosure also relates to a storage medium for storing the above program, such as a hard disk, a floppy disk, a CD, a DVD, and a flash memory, etc.
The methods/apparatuses described with reference to the embodiments of this disclosure may be directly embodied as hardware, software modules executed by a processor, or a combination thereof. For example, one or more functional block diagrams and/or one or more combinations of the functional block diagrams shown in the drawings may either correspond to software modules of procedures of a computer program, or correspond to hardware modules. Such software modules may respectively correspond to the steps shown in the drawings. And the hardware module, for example, may be carried out by firming the soft modules by using a field programmable gate array (FPGA).
The soft modules may be located in an RAM, a flash memory, an ROM, an EPROM, and EEPROM, a register, a hard disc, a floppy disc, a CD-ROM, or any memory medium in other forms known in the art. A memory medium may be coupled to a processor, so that the processor may be able to read information from the memory medium, and write information into the memory medium; or the memory medium may be a component of the processor. The processor and the memory medium may be located in an ASIC. The soft modules may be stored in a memory of a mobile terminal, and may also be stored in a memory card of a pluggable mobile terminal. For example, if equipment (such as a mobile terminal) employs an MEGA-SIM card of a relatively large capacity or a flash memory device of a large capacity, the soft modules may be stored in the MEGA-SIM card or the flash memory device of a large capacity.
One or more functional blocks and/or one or more combinations of the functional blocks in the drawings may be realized as a universal processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware component or any appropriate combinations thereof carrying out the functions described in this application. And the one or more functional block diagrams and/or one or more combinations of the functional block diagrams in the drawings may also be realized as a combination of computing equipment, such as a combination of a DSP and a microprocessor, multiple processors, one or more microprocessors in communication combination with a DSP, or any other such configuration.
This disclosure is described above with reference to particular embodiments. However, it should be understood by those skilled in the art that such a description is illustrative only, and not intended to limit the protection scope of the present invention. Various variants and modifications may be made by those skilled in the art according to the spirits and principle of the present invention, and such variants and modifications fall within the scope of the present invention.
As to implementations containing the above embodiments, following supplements are further disclosed.
Supplement 1. An inter-UE coordination method, including:
Supplement 2. The method according to supplement 1, wherein when the reserved resources are not preempted, the second terminal equipment determines to receive the coordination information, and when the reserved resources are preempted, the second terminal equipment determines to skip receiving the coordination information.
Supplement 3. The method according to supplement 1, wherein when the reserved resources are not preempted, the second terminal equipment determines to perform resource reselection based on the received coordination information, and when the reserved resources are preempted, the second terminal equipment determines to skip performing resource reselection based on the received coordination information.
Supplement 4. The method according to any one of supplements 1-3, wherein at a second slot prior to a first time interval of a first slot receiving the coordination information, the second terminal equipment detects whether the reserved resource is preempted, wherein the first time interval is greater than or equal to 0.
Supplement 5. The method according to any one of supplements 1-4, wherein the reserved resources are indicated by frequency resource assignment and time resource assignment field or a resource reservation period field in the sidelink control information.
Supplement 6. The method according to any one of supplements 1-5, wherein there exists a second time interval between the reserved resource and at least one piece of sidelink control information indicating the reserved resource, and there exists a receiving slot of the coordination information within the second time interval.
Supplement 7. The method according to supplement 6, wherein the second time interval includes a third time interval and a fourth time interval, the third time interval being a time interval between the reserved resource and a corresponding receiving slot of the coordination information, and the fourth time interval being an interval between the receiving slot of the coordination information and the sidelink control information indicating the reserved resource.
Supplement 8. The method according to supplement 7, wherein the third time interval is greater than or equal to a threshold in units of logical slots.
Supplement 9. The method according to supplement 7 or 8, wherein on the premise that the third time interval is satisfied, the receiving slot of the coordination information corresponding to the reserved resource is a slot where a physical sidelink feedback channel is located most close to a slot where the reserved resource is located.
Supplement 10. The method according to supplement 7, wherein the fourth time interval is determined based on a UE capability or UE implementation.
Supplement 11. The method according to any one of supplements 1-10, wherein the method further includes:
Supplement 12. The method according to supplement 11, wherein in a case where the ACK has been received before the coordination information is received, the second terminal equipment determines to skip receiving the coordination information or skip performing the resource reselection based on the received coordination information.
Supplement 13. The method according to supplement 11, wherein in a case where the ACK has not been received before the coordination information is received and the reserved resource is not preempted, the second terminal equipment determines to receive the coordination information or determines to perform the resource reselection based on the received coordination information;
Supplement 14. The method according to any one of supplements 1-13, wherein sidelink transmission indicated by the sidelink control information is of unicast, groupcast or broadcast.
Supplement 15. An inter-UE coordination method, including:
Supplement 16. The method according to supplement 15, wherein the method further includes:
Supplement 17. The method according to supplement 15, wherein the method further includes:
Supplement 18. The method according to any one of supplements 15-17, wherein the method further includes:
Supplement 19. The method according to any one of supplements 15-17, wherein the method further includes:
Supplement 20. The method according to any one of supplements 15-19, wherein at a second slot prior to a first time interval of a first slot receiving the coordination information, the first terminal equipment determines whether the reserved resource is reselected, wherein the first time interval is greater than or equal to 0.
Supplement 21. An inter-UE coordination method, including:
Supplement 22. The method according to supplement 21, wherein in a case where the ACK has been received before receiving the coordination information, the second terminal equipment determines to skip receiving the coordination information or skip performing resource reselection based on the received coordination information;
Supplement 23. The method according to supplement 21, wherein sidelink transmission indicated by the sidelink control information is of unicast, groupcast or broadcast.
Supplement 24. An inter-UE coordination method, including:
Supplement 25. The method according to supplement 24, wherein the method further includes:
Supplement 26. The method according to supplement 24, wherein the method further includes:
Supplement 27. A terminal equipment, including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to carry out the inter-UE coordination method as described in any one of supplements 1-26.
This application is a continuation of International Application No. PCT/CN2021/110813, filed on Aug. 5, 2021, the entire contents of which are incorporated herein by reference.
Number | Date | Country | |
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Parent | PCT/CN2021/110813 | Aug 2021 | WO |
Child | 18430162 | US |