Embodiments of the present disclosure relate to the field of communication technology.
For technologies related to vehicle communication, including V2X (Vehicle to Everything), P2X (Pedestrian to Everything), and the like (hereinafter also referred to collectively as V2X), a transmitting device may directly communicate with a receiving device via sidelink. Both current long term evolution (LTE) and new radio (NR) systems support V2X communication, i.e. LTE V2X and NR V2X.
For the sidelink, sidelink control information (SCI) is carried by a physical sidelink control channel (PSCCH), sidelink data information is carried by a physical sidelink shared channel (PSSCH), and sidelink feedback information (ACK/NACK) is carried by a physical sidelink feedback channel (PSFCH). The LTE V2X defines the PSCCH and the PSSCH. The NR V2X defines the PSCCH, the PSSCH and the PSFCH.
The transmitting device in the sidelink may autonomously select time-frequency resources for information transmission based on a result of sensing. The sensing includes monitoring the SCI, measuring reference signal received power (RSRP), and measuring the received signal strength indicator (RSSI), and the like. By sensing, resources that have been reserved by other devices can be avoided at the time of resource selection, and thus collision with sidelink transmissions of other devices can be avoided, thereby avoiding interference.
For autonomous resource selection, the following schemes are currently included: full sensing, partial sensing and random selection. For full sensing, the device performs sensing in each subframe or slot, which can effectively avoid interference, but continuous sensing means continuous power consumption, although this is not a problem for a vehicle device in the V2X, for a pedestrian device in the P2X, device power consumption is also an important factor to consider. For partial sensing, the device does not need to perform sensing in each subframe or slot, but only needs to perform sensing in a partial subframe or slot, which is advantageous for power reduction of the device, e.g., for a transmitting device of a pedestrian in the P2X that does not have a sufficient power supply, power can be saved considerably. For random selection, the device may not perform sensing at all. The three methods offer a compromise between avoiding interference and saving power to varying degrees. The LTE V2X supports full sensing, partial sensing and random selection. The NR V2X currently does not support for partial sensing.
It should be noted that, the above introduction to the background is merely for the convenience of clear and complete description of the technical solution of the present disclosure, and for the convenience of understanding of persons skilled in the art. It cannot be regarded that the above technical solution is commonly known to persons skilled in the art just because that the solution has been set forth in the background of the present disclosure.
The inventor has found that compared to LTE V2X, the NR V2X supports a short periodic service (a service with a periodicity less than 100 milliseconds) with more periodicities. More specifically, for the LTE V2X, the periodicity of the short periodic service can only be 20 milliseconds and 50 milliseconds, and for the NR V2X, the periodicity of the short periodic service may be 1 millisecond to 99 milliseconds. The NR V2X currently does not support partial sensing, and the partial sensing of the related LTE V2X cannot avoid the resources reserved by the NR V2X short periodic service, so the collision and the interference caused thereby cannot be avoided, and thus, the reliability of V2X transmission is affected, for example, the personal safety of pedestrians in P2X cannot be guaranteed.
To address at least one of the above problems, embodiments of the present disclosure provide a method and an apparatus for selecting sidelink resources.
According to one aspect of the embodiment of the present disclosure, there is provided with a method for selecting sidelink resources, including:
determining, by a terminal equipment, a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period;
monitoring sidelink control information in the first monitoring time period; and excluding one or more candidate resources in the selection time period according to the received sidelink control information.
According to another aspect of the embodiment of the present disclosure, there is provided with an apparatus for selecting sidelink resources, including:
a determining portion configured to determine a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period;
a monitoring portion configured to monitor sidelink control information in the first monitoring time period; and
an excluding portion configured to exclude one or more candidate resources in the selection time period according to the received sidelink control information.
According to another aspect of the embodiment of the present disclosure, there is provided with a communication system, including:
a terminal equipment configured to determine a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; monitor sidelink control information in the first monitoring time period; and exclude one or more candidate resources in the selection time period according to the received sidelink control information.
One of the advantageous effects of the embodiments of the present disclosure is that, the terminal equipment determines a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; and monitors the sidelink control information in the first monitoring time period. Hence, a resource collision with the short periodic service can be effectively avoided, thereby improving the reliability of the V2X, such as ensuring the pedestrian safety in the P2X.
With reference to the Description and drawings below, a specific embodiment of the present disclosure is disclosed in detail, which specifies the manner in which the principle of the present disclosure can be adopted. It should be understood that, the scope of the embodiment of the present disclosure is not limited. Within the scope of the spirit and clause of the appended claims, the embodiment of the present disclosure includes many variations, modifications and equivalents.
The features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, can be combined with the features in other embodiments or replace the features in other embodiments.
It should be emphasized that, the term “include/comprise” refers to, when being used in the text, existence of features, parts, steps or assemblies, without exclusion of existence or attachment of one or more other features, parts, steps or assemblies.
Elements and features described in one drawing or one embodiment of embodiments of the present disclosure may be combined with elements and features illustrated in one or more other drawings or embodiments. Furthermore, in the drawings, like reference numerals refer to corresponding parts in the several drawings and may be used to indicate corresponding parts used in more than one embodiment.
With reference to the drawings, the foregoing and other features of the present disclosure will become apparent through the following description. The Description and drawings specifically disclose the particular embodiment of the present disclosure, showing part of the embodiment in which the principle of the present disclosure can be adopted, it should be understood that the present disclosure is not limited to the described embodiment, on the contrary, the present disclosure includes all modifications, variations and equivalents that fall within the scope of the appended claims.
In embodiments of the present disclosure, the terms “first,” “second,” and the like are used to distinguish different elements from each other in terms of appellation, but do not denote the spatial arrangement or temporal order or the like of these elements, and these elements should not be limited by these terms. The term “and/or” includes any one and all combinations of one or more of the associated listed terms. The terms “containing”, “including”, “having” and the like refer to presence of the stated features, elements, components or assemblies, but do not exclude presence or addition of one or more other features, elements, components or assemblies.
In embodiments of the present disclosure, the singular form “a,” “the” and the like includes the plural form, and is to be understood in a broad sense as “a kind” or “a type” and is not limited to “one”; in addition, the term “said” is to be understood to include both singular and plural forms, unless otherwise specified clearly in the context. In addition, the term “according to” shall be understood to mean “at least partially according to . . . ” and the term “based on” shall be understood to mean “based at least partially on . . . ”, unless otherwise specified clearly in the context.
In embodiments of the present disclosure, the term “communication network” or “wireless communication network” may refer to a network that conforms to any communication standard, such as long term evolution (LTE), LTE-Advanced (LTE-A), wideband code division multiple access (WCDMA), high-speed packet access (HSPA), and the like.
Also, the communication between the devices in the communication system may be performed according to a communication protocol at any stage, for example, but not limited to, the following communication protocols: 1G, 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio, and the like, and/or other communication protocols currently known or to be developed in the future.
In embodiments of the present disclosure, the term “network device” refers, for example, to a device in the communication system that accesses a terminal equipment to the communication network and provides a service for the terminal equipment. Network devices may include, but are not limited to, 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 is not limited to, a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a 5G base station (gNB), and the like, and may further include a remote radio head (RRH), a remote radio unit (RRU), a relay or a low power node (e.g. femto, pico, etc.). And the term “base station” may include some or all of their functions, and each base station may provide communication coverage for a particular geographic area. The term “cell” may refer to a base station and/or its coverage area, depending on the context in which the term is used.
In embodiments of the present disclosure, the term “user equipment” or “terminal device” (or terminal equipment) refers, for example, to a device that accesses a communication network and receives network services through 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), a station, etc.
The terminal equipment may include, but is not limited to, a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a machine type communication device, a laptop computer, a cordless phone, a smart phone, a smart watch, a digital camera, etc.
For another example, in a scenario such as Internet of Things (IoT) or the like, the terminal equipment may also be a machine or an apparatus for monitoring or measuring, such as but not limited to, a machine type communication (MTC) terminal, a vehicle-mounted communication terminal, a device to device (D2D) terminal, a machine to machine (M2M) terminal, etc.
Furthermore, the term “network side” or “network device side” refers to a side of the network, which may be a certain base station or may include one or more network devices as above. The term “user side” or “terminal side” or “terminal equipment side” refers to a side of a user or terminal, which may be a certain UE or may include one or more terminal equipments as above. Herein, a “device” may refer to both a network device and a terminal equipment unless otherwise specified.
The scenario of the embodiments of the present disclosure is described below by way of examples, but the present disclosure is not limited thereto.
In an embodiment of the present disclosure, existing services or services that can be implemented in the future can be transmitted between the network device 101 and the terminal equipments 102 and 103. For example, these services may include, but are not limited to, enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC) and Ultra-Reliable and Low-Latency Communication (URLLC), etc.
It should be noted that
In an embodiment of the present disclosure, sidelink transmission may be performed between the two terminal equipments 102 and 103. For example, both terminal equipments 102 and 103 may perform sidelink transmission within the coverage of the network device 101 to implement V2X communication, or may also perform sidelink transmission outside the coverage of the network device 101 to implement V2X communication; or alternatively, one terminal equipment 102 is within the coverage of the network device 101 and the other terminal equipment 103 is outside the coverage of the network device 101 for sidelink transmission to implement V2X communication.
In an embodiment of the present disclosure, the terminal equipments 102 and/or 103 may autonomously select sidelink resources (i.e., adopting Mode 2), in which case the sidelink transmission may be independent of the network device 101, i.e., the network device 101 is optional. Of course, in the embodiment of the present disclosure, autonomous selection of the sidelink resources (i.e., adopting Mode 2) and allocation of the sidelink resources by the network device can be combined, and the embodiment of the present disclosure is not limited thereto.
In the LTE V2X, the terminal equipment may obtain the sidelink transmission resource by processes of sensing detection and resource selection, wherein the sensing may be continuously performed to obtain the occupation situation of the resources in the resource pool. For example, the terminal equipment may estimate resource occupancy in the subsequent time period (referred to as a selection window or selection time period) according to the resource occupancy in the preceding time period (referred to as a sensing window or sensing time period).
For example, the steps of LTE V2X partial sensing can refer to the contents in 3GPP TS 36.213 V15.2.0, section 14.1.1.6, etc. and the main steps of LTE V2X partial sensing can be described in the following Table 1:
With regard to 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 can avoid interference or collision between devices to a certain extent. The steps for resource selection can be found in sub-section 8.1.4 of Standard TS 38.214 V16.2.0. Partial sensing is not supported by NR V2X currently.
Compared to LTE V2X, NR V2X supports short periodic service with more periodicities. More specifically, for the LTE V2X, the periodicity of the short periodic service can only be 20 milliseconds and 50 milliseconds, and for the NR V2X, the periodicity of the short periodic service can be 1 millisecond to 99 milliseconds. The NR V2X currently does not support partial sensing, and the partial sensing of the related LTE V2X cannot avoid the resources reserved by the NR V2X short periodic service, so the collision and the interference caused thereby cannot be avoided, and thus, the reliability of V2X transmission is affected, for example, the personal safety of pedestrians in P2X cannot be guaranteed.
As shown in
According to the LTE V2X partial sensing, for the short periodic service with a periodicity of 20 milliseconds, the device determines a monitoring window of 15 milliseconds as shown in the upper part of
According to the LTE V2X partial sensing, for the short periodic service with a periodicity of 80 milliseconds, the device determines a monitoring window of 15 milliseconds as shown in the lower part of
In the embodiment of the present disclosure, the sidelink is described by taking V2X as an example, but the present disclosure is not limited thereto, and can also be applied to a sidelink transmission scenario other than V2X. In the following description, the terms “sidelink” and “V2X” may be interchanged, the terms “PSFCH” and “sidelink feedback channel” may be interchanged, the terms “PSCCH” and “sidelink control channel” or “sidelink control information” may be interchanged, and the terms “PSSCH” and “sidelink data channel” or “sidelink data” may also be interchanged without causing confusion.
In addition, transmitting or receiving PSCCH can be understood as transmitting or receiving sidelink control information carried by the PSCCH; transmitting or receiving PSSCH can be understood as transmitting or receiving sidelink data carried by the PSSCH; transmitting or receiving the PSFCH can be understood as transmitting or receiving sidelink feedback information carried by the PSFCH. Sidelink transmission can be understood as PSCCH/PSSCH transmission or sidelink data/information transmission.
An embodiment of the present disclosure provides a method for selecting sidelink resources, which is described from a terminal equipment. The terminal equipment can transmit sidelink data to other terminal equipments, and therefore the terminal equipment needs to perform resource selection/reselection to determine the transmission resource of the sidelink data. From the perspective of sidelink data transmission, the terminal equipment of the embodiments of the present disclosure is a transmitting device, and the other terminal equipments are receiving devices.
301, a terminal equipment determines a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period;
302, the terminal equipment monitors sidelink control information in the first monitoring time period; and
303, the terminal equipment excludes one or more candidate resources in the selection time period according to the received sidelink control information.
It should be noted that
In an embodiment of the present disclosure, the terminal equipment may perform sidelink resource selection or re-selection, referred to as (re-) selection, including resource exclusion. The resource re-selection may be triggered by a result of resource re-evaluation or preemption detection performed by the terminal equipment, and “resource selection or re-selection” may also be referred to as “resource selection/resource re-selection/resource re-evaluation/preemption detection”. With regard to the specific contents of resource selection/resource re-selection/resource re-evaluation/preemption detection, and resource exclusion, reference can be made to the related art, which will not be described in detail herein.
In some embodiments, the service periodicity is a periodicity of a service that a terminal equipment is intended to avoid, and the service periodicity is less than 100 milliseconds. The time unit in the embodiments of the present disclosure represents a logical time unit, that is, a time unit belonging to a sidelink resource pool. The time unit may be a sub-frame, a slot, or a symbol.
It is assumed that T milliseconds can be converted into PT time units, also referred to simply as PT corresponding to T milliseconds. For the physical time unit txSL, the logical time unit (time unit) corresponding thereto may be denoted as x or tx′SL or other forms. For convenience of description, the embodiments of the present disclosure uses x to denote a time unit corresponding to the physical time unit txSL.
In some embodiments, the terminal equipment determines a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, a time length of the reference time period being equal to the service periodicity; periodically repeats the selection time period one or more times in a backward time direction according to the service periodicity, to obtain one or more periodic time periods; and determines a time period in which the reference time period and the one or more periodic time periods at least partially overlap as the first monitoring time period.
In the embodiments of the present disclosure, for a periodic service with a periodicity being less than 100 milliseconds, in other words, the periodic service with the periodicity P is a periodic service with a periodicity being less than 100 milliseconds, denoted as P<P100, where 100 milliseconds is converted into a logical time unit P100, that is, P100 denotes the number of time units included in 100 milliseconds.
As shown in
As shown in
For example, as shown in
In some embodiments, the terminal equipment determines a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, a time length of the reference time period being equal to the service periodicity; periodically repeats the selection time period in a backward time direction for one or more times according to the service periodicity to obtain a last periodic time period at least partially overlapping with the reference time period, a last time unit in the last periodic time period along the reference time period being divided into a first time period and a second time period; and offsets the second time period in a backward time direction by a time length of the service periodicity, and determines the first time period and the offset second time period as the first monitoring time period.
For example, as shown in
In some embodiments, the first monitoring time period includes a time unit x;
x=y−k×P; when y≤x′+(α−1)×P; k=α−1; otherwise,
where, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the first monitoring time period includes a time unit x;
x=x′−mod(A,P),
mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the first monitoring time period includes a time unit x;
x=x′−P+mod(B,P),
where, mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the service periodicity is less than a time interval between the last time unit of the sensing time period and the last time unit of the selection time period. That is, P<y′−x′.
In some embodiments, a time length of the first monitoring time period is less than or equal to the service periodicity.
In some embodiments, the time length of the selection time period is less than the service periodicity.
In the embodiments of the present disclosure, no limitation is placed on how to determine the last time unit x′ that the device can monitor. For example, x′ is a time unit in which a periodic service of 100 milliseconds is monitored; or x′ is a time unit in which an aperiodic service is monitored; or x′ is the last time unit that can be monitored, as determined by the processing capability of the device.
In some embodiments, the last time unit of the sensing time period is: a time unit y′−P100, where y′ denotes the last time unit of the selection time period and P100 denotes the number of time units included in 100 milliseconds.
In some embodiments, the last time unit of the sensing time period is: the last time unit temporally preceding a physical time unit n−Tproc,0SL, wherein n denotes a physical time unit for a higher layer to trigger resource selection, and Tproc,0SL denotes a processing time, in units of physical time units.
In some embodiments, the last time unit of the sensing time period is: the last time unit temporally preceding a physical time unit tz′SL−T; where, z′ denotes the first time unit of the selection time period, tz′SL denotes a first physical time unit of the selection time period, and T denotes a processing time, in units of physical time units.
For example, T=Tproc,0SL+Tproc,1SL+1, or T=Tproc,0SL+Tproc,1SL, where Tproc,0SL and Tproc,1SL denotes processing time, in units of physical time units.
Assuming that the time unit is a slot, Tproc,0SL and Tproc,1SL may follow the values in Standard TS 38.214, e.g. as shown in Tables 2 and 3.
The embodiments of the present disclosure do not limit how Pstep is determined. For example, in LTE V2X partial sensing, the last physical slot (sub-frame) that the device can monitor is tx′SL, where x′=y′−Pstep, Pstep is the number of logical slots obtained after converting 100 milliseconds into logical slots. If the device needs to monitor the periodic service with a periodicity of Prsvp_RX (Prsvp_RX<Pstep, Prsvp_RX in logical slots), for a physical slot tySL in Y physical slots, the device monitors a physical slot tzSL, where z=y′−Pstep−mod(A, Prsvp_RX), and
in
in
In some embodiments, the terminal equipment further monitors sidelink control information in a union set formed by a second monitoring time period and the first monitoring time period; wherein a last time unit of the second monitoring time period is the last time unit of the sensing time period, and a time length of the second monitoring time period is equal to the service periodicity or the time length of the selection time period.
As shown in
The first monitoring time period is schematically described above, and resource selection or resource exclusion of the device is described below.
In some embodiments, the terminal equipment receives first sidelink control information indicating that the service periodicity is Prsvp_RX in a time unit m, and a reference signal received power (RSRP) obtained based on the first sidelink control information is higher than the RSRP threshold, and the terminal equipment excludes candidate resources as follows:
the candidate resource Rx,y+j×P
where, j=0, 1, . . . , Cresel−1, q=1, 2, . . . , Q, Cresel denotes the number of time units that the terminal equipment needs to transmit; if Prsvp_RX<Pstep, and the time unit m is in the reference time period,
otherwise Q=1, Pstep is the time interval between the last time unit of the sensing time period and the last time unit of the selection time period, Prsvp_TX denotes a service periodicity that the terminal equipment needs to perform transmission, and Rx,y denotes a number of consecutive sub-channels with a frequency lowest sub-channel x located at the time unit y.
The description above is only made by taking the service with a certain periodicity Prsvp_RX as an example, when the device needs to monitor more than one service with a periodicity Prsvp_RX, each periodic service will correspond to a monitoring time period, and the monitoring time period is the first monitoring time period described above, or a union set of the first monitoring time period and the second monitoring time period. The device monitors the union set of all monitoring time periods.
A certain time unit that the terminal equipment needs to monitor may be determined in order to monitor a certain periodic service, but the terminal equipment is not limited to only monitoring the periodic service in the time unit, and the terminal equipment monitors the SCI indifferently. For example, even if a certain time unit is determined in order to monitor P1 periodic service, P2 periodic service may be received in the time unit. For convenience of explanation, the monitoring time period determined by the terminal equipment for monitoring the P periodic service is simply referred to as the monitoring time period of the P periodic service.
The device may need to monitor and avoid a plurality of periodic services, and for different periodic services, a same time unit is selected as the last time unit that the device can monitor, which is beneficial for reducing the total number of time units that the device needs to monitor, thereby saving power. This is because the monitoring time periods for different periodic services determined based on the same last time unit may have an intersection, and monitoring the intersection can obtain a resource reservation situation of multiple periodic services, which actually reduces the number of time units required to be monitored by the device, and is beneficial for reducing power consumption.
For example, for the purpose of monitoring 100-millisecond periodic service, the monitoring time period of the 100-millisecond periodic service may be determined according to the LTE V2X partial sensing, and the last time unit of the monitoring time period is denoted as x′. x′ is used as the last time unit that the device can monitor to determine the monitoring time period of other periodic services with the periodicity being less than 100 milliseconds.
The above embodiments merely exemplify the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments. For example, each of the above embodiments may be used alone or in combination with one or more of the above embodiments.
As can be seen from the above embodiments, the terminal equipment determines a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; and monitors the sidelink control information in the first monitoring time period. Hence, a resource collision with the short periodic service can be effectively avoided, thereby improving the reliability of the V2X, such as ensuring the pedestrian safety in the P2X.
An embodiment of the present disclosure provides a method for selecting sidelink resources, which is described from a terminal equipment, and the same content as the embodiments of the first aspect will not be described in detail. An embodiment of the second aspect may be performed in combination with the embodiment of the first aspect or may be performed separately.
For the periodic service satisfying P<P100, the determination of the monitoring time period is also based on the size relationship between P and y′−x′.
In some embodiments, the first monitoring time period includes a time unit x, x=y−P, P denotes the service periodicity, and y denotes a time unit in the selection time period. wherein the service periodicity is greater than or equal to a time interval between the last time unit of the sensing time period and the last time unit of the selection time period.
For example, if P<y′−x′, the monitoring time period is determined using the embodiments of the first aspect; if P≥y′−x′, the monitoring time period is determined as follows: for the time unit y in the resource selection period, the device needs to monitor the time unit y−P.
For another example, if P y′−x′, for the time unit y in the resource selection time period, the device needs to monitor the time unit x′−mod(A,P), where
and if P≥y′−x′, the device needs to monitor the time unit y−P for the time unit y in the resource selection time period.
In some embodiments, the device monitors 100-millisecond periodic service and the device also monitors aperiodic service. The last time unit that the device can monitor is a time unit that the device determines in order to monitor the aperiodic service, and in other words, the device determines the last time unit based on monitoring the aperiodic service. In this case, instead of determining the monitoring time period to monitor P periodic service based on the last time unit in which the 100-millisecond periodic service is monitored, the device determines the monitoring time period to monitor P periodic service based on the last time unit in which the aperiodic service is monitored.
For example, the last time unit x′ determined by the device based on monitoring the 100-millisecond periodic service satisfies y′−x′=P100, and the last time unit x′ determined by the device based on monitoring the aperiodic service may satisfy y′−x′<P100. Since y′−x′<P100, there may be P such that y′−x′≥P<P100. If P≥y′−x′, the device should not actually treat the P periodic service as a short periodic service, otherwise there may still be an unavoidable P periodic service.
The above embodiments merely exemplify the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments. For example, each of the above embodiments may be used alone or in combination with one or more of the above embodiments.
As can be seen from the above embodiments, a resource collision with the short periodic service can be effectively avoided, thereby improving the reliability of the V2X, such as ensuring the pedestrian safety in the P2X.
An embodiment of the present disclosure provides a method for selecting sidelink resources, which is described from a terminal equipment, and the same content as the embodiments of the first and second aspects will not be described in detail. An embodiment of the third aspect may be performed in combination with the embodiments of the first and second aspects or may be performed separately.
In some embodiments, the terminal equipment determines whether to enable the first monitoring time period; and in a case where the first monitoring time period is enabled, monitors the sidelink control information in the first monitoring time period, and in a case where the first monitoring time period is disabled, does not monitor the sidelink control information in the first monitoring time period.
For example, the monitoring time period for the device to monitor a periodicity P (P<P100) service is not constant, but may be dynamically enabled or disabled. In order to monitor the service of the periodicity P, the device may need to additionally monitor some time units, and for these additional monitoring time units, the device may additionally consume power for monitoring, and it may therefore be considered to enable or disable the first monitoring time period.
In some embodiments, the terminal equipment, in a case where a periodic service with a periodicity of the service periodicity is received before the first monitoring time period, enables the first monitoring time period, and in a case where a periodic service with a periodicity of the service periodicity is not received before the first monitoring time period, disable the first monitoring time period.
For example, if the device has not received an SCI indicating the periodicity P before the monitoring time period, the device considers that the probability of being interfered by the periodicity P service at the time of resource selection is small, the device can therefore disable these additional monitoring time units, i.e. it is not necessary to increase the monitoring occasions specifically for the monitoring time period P service. Power can be saved since no time units to monitor are added. Otherwise, the device monitors the determined monitoring time period according to the embodiments of the first and second aspects described above.
Through the embodiments of the present disclosure, the monitoring of the short periodic service can be dynamically turned on or off, so that the beneficial effect of saving power can be achieved.
The above embodiments merely exemplify the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments. For example, each of the above embodiments may be used alone or in combination with one or more of the above embodiments.
An embodiment of the present disclosure provides an apparatus for selecting sidelink resources. The apparatus may be, for example, a terminal equipment or may be a certain or some parts or components configured in the terminal equipment, and the same content as the embodiments of the first to third aspects will not be described in detail.
a determining portion 1501 configured to determine a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period;
a monitoring portion 1502 configured to monitor sidelink control information in the first monitoring time period; and
an excluding portion 1503 configured to exclude one or more candidate resources in the selection time period according to the received sidelink control information.
In some embodiments, the first monitoring time period includes a time unit x;
x=y−k×P; when y≤x′+(α−1)×P; k=α−1; otherwise,
where, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the first monitoring time period includes a time unit x;
x=x′−mod(A,P),
where, mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the first monitoring time period includes a time unit x;
x=x′−P+mod(B,P),
where, mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
In some embodiments, the determining portion 1501 is used to: determine a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, a time length of the reference time period being equal to the service periodicity; periodically repeat the selection time period one or more times in a backward time direction according to the service periodicity, to obtain one or more periodic time periods; and determine a time period in which the reference time period and the one or more periodic time periods at least partially overlap as the first monitoring time period.
In some embodiments, the determining portion 1501 is used to: determine a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, a time length of the reference time period being equal to the service periodicity; periodically repeat the selection time period in a backward time direction for one or more times according to the service periodicity to obtain a last periodic time period at least partially overlapping with the reference time period, a last time unit in the last periodic time period along the reference time period being divided into a first time period and a second time period; and offset the second time period in a backward time direction by a time length of the service periodicity, and determine the first time period and the offset second time period as the first monitoring time period.
In some embodiments, the monitoring portion 1502 is further used to monitor sidelink control information in a union set formed by a second monitoring time period and the first monitoring time period; wherein a last time unit of the second monitoring time period is the last time unit of the sensing time period, and a time length of the second monitoring time period is equal to the service periodicity or the time length of service the selection time period.
In some embodiments, the service periodicity is less than a time interval between the last time unit of the sensing time period and the last time unit of the selection time period.
In some embodiments, a time length of the first monitoring time period is less than or equal to the service periodicity.
In some embodiments, the time length of the selection time period is less than the service periodicity.
In some embodiments, the first monitoring time period includes a time unit x, x=y−P, P denotes the service periodicity, and y denotes a time unit in the selection time period.
In some embodiments, the service periodicity is greater than or equal to a time interval between the last time unit of the sensing time period and the last time unit of the selection time period.
In some embodiments, the service periodicity is a periodicity of a service that a terminal equipment is intended to avoid, and the service periodicity is less than 100 milliseconds.
In some embodiments, the last time unit of the sensing time period is one of the following:
a time unit y′−P100; where y′ denotes the last time unit of the selection time period, and P100 denotes the number of time units included in 100 milliseconds;
or, a last time unit temporally preceding a physical time unit n−Tproc,0SL; where, n denotes a physical time unit where a high-layer triggers resource selection, and Tproc,0SL denotes a processing time, in units of physical time units;
or, a last time unit temporally preceding a physical time unit tz′SL−T; where, z′ denotes the first time unit of the selection time period, tz′SL denotes a first physical time unit of the selection time period, and T denotes a processing time, in units of physical time units.
In some embodiments, T=Tproc,0SL+Tproc,1SL+1, or T=Tproc,0SL+Tproc,1SL, where Tproc,0SL and Tproc,1 denotes processing time, in units of physical time units.
In some embodiments, the first sidelink control information indicating that the service periodicity is Prsvp_RX is received in a time unit m, and a reference signal received power (RSRP) obtained based on the first sidelink control information is higher than the RSRP threshold,
the excluding portion 1503 excludes the following candidate resources that:
the candidate resource Rx,y+j×P
where, j=0, 1, . . . , Cresel−1, q=1, 2, . . . , Q, Cresel denotes the number of time units that the terminal equipment needs to transmit; if Prsvp_RX<Pstep, and the time unit m is in the reference time period,
otherwise Q=1, Pstep is the time interval between the last time unit of the sensing time period and the last time unit of the selection time period, Prsvp_TX denotes a service periodicity that the terminal equipment needs to transmit, and Rx,y denotes a number of consecutive sub-channels with a frequency lowest sub-channel x located at the time unit y.
In some embodiments, the determining portion 1501 is further used to: determine whether to enable the first monitoring time period; and in a case where the first monitoring time period is enabled, monitor the sidelink control information in the first monitoring time period, and in a case where the first monitoring time period is disabled, not monitor the sidelink control information in the first monitoring time period.
In some embodiments, in a case where a periodic service with a period of the service periodicity is received before the first monitoring time period, the first monitoring time period is enabled, and in a case where a periodic service with a period of the service periodicity is not received before the first monitoring time period, the first monitoring time period is disabled.
The above embodiments merely exemplify the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments. For example, each of the above embodiments may be used alone or in combination with one or more of the above embodiments.
It should be noted that only the components or modules related to the present disclosure have been described above, but the present disclosure is not limited thereto. The apparatus 1500 for selecting sidelink resources may further include other components or modules, and related art may be referred to for details of these components or modules.
In addition, for the sake of simplicity,
As can be seen from the above embodiments, the terminal equipment determines a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; and monitors the sidelink control information in the first monitoring time period. Hence, a resource collision with the short periodic service can be effectively avoided, thereby improving the reliability of the V2X, such as ensuring the pedestrian safety in the P2X.
An embodiment of the present disclosure further provides a communication system, which can refer to
In some embodiments, the communication system 100 may include at least:
a terminal equipment 102 configured to determine a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; monitor sidelink control information in the first monitoring time period; and exclude one or more candidate resources in the selection time period according to the received sidelink control information.
An embodiment of the present disclosure further provides a network device, which may be, for example, a base station, but the present disclosure is not limited thereto, and may also be other network devices.
In addition, as shown in
An embodiment of the present disclosure further provides a terminal equipment, but the present disclosure is not limited thereto, and may also be other devices.
For example, the processor 1710 may be configured to execute a program to implement the method for selecting sidelink resources as described in the embodiments of the first to third aspects. For example, the processor 1710 may be configured to control to: determine a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period; monitor sidelink control information in the first monitoring time period; and exclude one or more candidate resources in the selection time period according to the received sidelink control information.
As shown in
Embodiments of the present disclosure further provide a computer program, wherein when the program is executed in a terminal equipment, the program causes the terminal equipment to execute the method for selecting sidelink resources as described in the embodiments of the first to third aspects.
Embodiments of the present disclosure further provide a storage medium in which a computer program is stored, wherein the computer program causes the terminal equipment to execute the method for selecting sidelink resources as described in the embodiments of the first to third aspects.
The above apparatus and method of the present disclosure may be implemented by hardware, or may be implemented by hardware in combination with software. The present disclosure relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or constituent components described above, or enables the logic component to implement the various methods or steps described above. The present disclosure also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.
The method/apparatus described in connection with embodiments of the present disclosure may be embodied directly in hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional blocks and/or one or more combinations of the functional blocks shown in the drawings may correspond to each software module or each hardware module of a computer program flow. These software modules may correspond to the respective steps shown in the drawings. The hardware modules may be implemented, for example, by solidifying the software modules using a field programmable gate array (FPGA).
A software module may be located in an RAM memory, a flash memory, an ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor to enable the processor to read information from and write information to the storage medium, or the storage medium may be an integral part of the processor. The processor and the storage medium may reside in an ASIC. The software module may be stored in a memory of the mobile terminal or in a memory card insertable into the mobile terminal. For example, if the device (such as a mobile terminal) employs a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the large-capacity flash memory device.
One or more of the functional blocks and/or one or more combinations of the functional blocks depicted in the accompanying drawings may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, a discrete gate or a transistor logic device, a discrete hardware component, or any suitable combination thereof designed to perform the functions described in the present disclosure. One or more of the functional blocks and/or one or more combinations of the functional blocks depicted in the accompanying drawings may also be implemented as combination of computing devices, e.g., combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with the DSP, or any other such configuration.
The present disclosure is described in combination with specific embodiments hereinabove, but a person skilled in the art should know clearly that the description is exemplary, but not limitation to the protection scope of the present disclosure. A person skilled in the art can make various variations and modifications to the present disclosure according to spirit and principle of the disclosure, and these variations and modifications should also be within the scope of the present disclosure.
As to implementations containing the above embodiments, following supplements are further disclosed.
Supplement 1. A method for selecting sidelink resources, including:
determining, by a terminal equipment, a first monitoring time period at least according to a service periodicity, a last time unit of a sensing time period and a last time unit of a selection time period;
monitoring sidelink control information in the first monitoring time period; and excluding one or more candidate resources in the selection time period according to the received sidelink control information.
Supplement 2. The method according to the supplement 1, wherein the first monitoring time period includes a time unit x;
x=y−k×P; when y≤x′+(α−1)×P, k=α−1; otherwise,
where x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
Supplement 3. The method according to the supplement 1, wherein the first monitoring time period includes a time unit x;
x=x′−mod(A,P),
where, mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
Supplement 4. The method according to the supplement 1, wherein the first monitoring time period includes a time unit x;
x=x′−P+mod(B,P),
where, mod( ) denotes a modulo operation, x′ denotes the last time unit of the sensing time period, P denotes the service periodicity, y′ denotes the last time unit of the selection time period, and y denotes a time unit in the selection time period.
Supplement 5. The method according to the supplement 1, wherein the method further includes:
determining, by the terminal equipment, a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, and the time length of the reference time period being equal to the service periodicity;
periodically repeating the selection time period in a backward time direction for one or more times according to the service periodicity to obtain one or more periodic time periods; and determining at least partially overlapped time periods of the reference time period and the one or more periodic time periods as the first monitoring time period.
Supplement 6. The method according to the supplement 1, wherein the method further includes:
determining, by the terminal equipment, a reference time period, the last time unit of the reference time period being the last time unit of the sensing time period, and the time length of the reference time period being equal to the service periodicity;
periodically repeating the selection time period in a backward time direction for one or more times according to the service periodicity to obtain a last periodic time period at least partially overlapping with the reference time period, a last time unit in the last periodic time period along the reference time period being divided into a first time period and a second time period; and
offsetting the second time period in a backward time direction by a time length of the service periodicity, and determine the first time period and the offset second time period as the first monitoring time period.
Supplement 7. The method according to any of the supplements 1 to 6, wherein the method further includes:
the terminal equipment further monitors sidelink control information in a union set formed by a second monitoring time period and the first monitoring time period; wherein a last time unit of the second monitoring time period is the last time unit of the sensing time period, and a time length of the second monitoring time period is equal to the periodicity or the time length of the selection time period.
Supplement 8. The method according to any of the supplements 1 to 7, wherein the service periodicity is less than a time interval between the last time unit of the sensing time period and the last time unit of the selection time period.
Supplement 9. The method according to any of the supplements 1 to 8, wherein a time length of the first monitoring time period is less than or equal to the service periodicity.
Supplement 10. The method according to any of the supplements 1 to 9, wherein the time length of the selection time period is less than the service periodicity.
Supplement 11. The method according to the supplement 1, wherein the first monitoring time period includes a time unit x, x=y−P; where, P denotes the service periodicity, and y denotes a time unit in the selection time period.
Supplement 12. The method according to the supplement 11, wherein the service periodicity is greater than or equal to a time interval between the last time unit of the sensing time period and the last time unit of the selection time period.
Supplement 13. The method according to any of the supplements 1 to 12, wherein the service periodicity is a periodicity of a service that a terminal equipment is intended to avoid, and the service periodicity is less than 100 milliseconds.
Supplement 14. The method according to any of the supplements 1 to 13, wherein the last time unit of the sensing time period is one of the following:
a time unit y′−P100; where y′ denotes the last time unit of the selection time period, and P100 denotes the number of time units included in 100 milliseconds;
or, a last time unit temporally preceding a physical time unit n−Tproc,0SL; where, n denotes a physical time unit where a high-layer triggers resource selection, and Tproc,0SL denotes a processing time, in units of physical time units;
or, a last time unit temporally preceding a physical time unit tz′SL−T; where, z′ denotes the first time unit of the selection time period, tz′SL denotes a first physical time unit of the selection time period, and T denotes a processing time, in units of physical time units.
Supplement 15. The method according to the supplement 14, wherein T=Tproc,0SL+Tproc,1SL+1, or T=Tproc,0SL+Tproc,1SL, where, Tproc,0SL and Tproc,1SL denote processing times, in units of physical time units.
Supplement 16. The method according to any of the supplements 1 to 10, wherein the terminal equipment receives first sidelink control information indicating that the service periodicity is Prsvp_RX in a time unit m, and a reference signal received power (RSRP) obtained based on the first sidelink control information is higher than the RSRP threshold, and the terminal equipment excludes candidate resources as follows:
the candidate resource Rx,y+j×P
where, j=0, 1, . . . , Cresel−1, q=1, 2, . . . , Q, Cresel denotes the number of time units that the terminal equipment needs to transmit; if Prsvp_RX<Pstep, and the time unit m is in the reference time period,
otherwise Q=1, Pstep is the time interval between the last time unit of the sensing time period and the last time unit of the selection time period, Prsvp_TX denotes a service periodicity that the terminal equipment needs to transmit, and Rx,y denotes a number of consecutive sub-channels with a frequency lowest sub-channel x located at the time unit y.
Supplement 17. The method according to any of the supplements 1 to 16, wherein the method further includes:
determining, by the terminal equipment, whether to enable the first monitoring time period; and
in a case where the first monitoring time period is enabled, monitoring the sidelink control information in the first monitoring time period, in a case where the first monitoring time period is disabled, not monitoring the sidelink control information in the first monitoring time period.
Supplement 18. The method according to the supplement 17, wherein the terminal equipment, in a case where a periodic service with a periodicity of the service periodicity is received before the first monitoring time period, enables the first monitoring time period, and in a case where a periodic service with a periodicity of the service periodicity is not received before the first monitoring time period, disable the first monitoring time period.
Supplement 19. A terminal equipment, including a memory and a processor, the memory storing a computer program, the processor being configured to execute the computer program to implement the method for selecting sidelink resources according to any of the supplements 1 to 18.
This application is a continuation application of International Application PCT/CN2020/122997 filed on Oct. 22, 2020 and designated the U.S., the entire contents of which are incorporated herein by reference.
Number | Date | Country | |
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Parent | PCT/CN2020/122997 | Oct 2020 | US |
Child | 18134622 | US |