Embodiments of the present application are related to wireless communication technology, and more particularly, related to methods and apparatuses for a pre-emption check procedure for a sidelink transmission in 3GPP (3rd Generation Partnership Project) 5G networks.
Vehicle to everything (V2X) has been introduced into 3GPP 5G wireless communication technology. In terms of a channel structure of V2X communication, a direct link between two UEs is called a sidelink. A sidelink is a long-term evolution (LTE) feature introduced in 3GPP Release 12, and enables a direct communication between proximal UEs, and data does not need to go through a base station (BS) or a core network.
3GPP 5G networks are expected to increase network throughput, coverage, and robustness and reduce latency and power consumption. With the development of 3GPP 5G networks, various aspects need to be studied and developed to perfect the 5G technology. Currently, details regarding a pre-emption check procedure for a sidelink transmission have not been discussed in 3GPP 5G technology yet.
Some embodiments of the present application provide a method, which may be performed by a user equipment (UE). The method includes: receiving, from another UE, information associated with a pre-emption check procedure on another reserved resource of the abovementioned UE; and making an adjustment relating to a transmission on a reserved resource of the UE according to the information.
Some embodiments of the present application provide a further method, which may be performed by a UE. The method includes: transmitting, to another UE, information associated with a pre-emption check procedure on a reserved resource of the UE.
Some embodiments of the present application provide an apparatus. The apparatus includes: a non-transitory computer-readable medium having stored thereon computer-executable instructions, a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry and the transmitting circuitry, wherein the computer-executable instructions cause the processor to implement any of the abovementioned methods performed by a UE.
The details of one or more examples are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims.
In order to describe the manner in which advantages and features of the present application can be obtained, a description of the present application is rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. These drawings depict only exemplary embodiments of the present application and are not therefore intended to limit the scope of the present application.
The detailed description of the appended drawings is intended as a description of preferred embodiments of the present application and is not intended to represent the only form in which the present application may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present application.
Reference will now be made in detail to some embodiments of the present application, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architecture and new service scenarios, such as 3GPP 5G, 3GPP LTE Release 8, B5G, 6G, and so on. It is contemplated that along with developments of network architectures and new service scenarios, all embodiments in the present application are also applicable to similar technical problems; and moreover, the terminologies recited in the present application may change, which should not affect the principle of the present application.
In a V2X communication system, a transmission UE may also be named as a transmitting UE, a Tx UE, a sidelink Tx UE, a sidelink transmission UE, or the like. A reception UE may also be named as a receiving UE, a Rx UE, a sidelink Rx UE, a sidelink reception UE, or the like.
As shown in
The V2X transmission implemented in the wireless communication system 100 of the embodiments of
Each UE in
In some embodiments of the present application, a UE in
In some embodiments of the present application, each UE in
According to some embodiments of
The wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a Time Division Multiple Access (TDMA)-based network, a Code Division Multiple Access (CDMA)-based network, an Orthogonal Frequency Division Multiple Access (OFDMA)-based network, a LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high altitude platform network, and/or other communications networks.
In some embodiments of the present application, the wireless communication system 100 is compatible with the 5G NR of the 3GPP protocol, wherein BS(s) (not shown in
Currently, two sidelink resource allocation modes are supported, i.e., Mode 1 and Mode 2. In Mode 1, sidelink resource(s) in time and frequency domains allocation is provided by a network or a BS. In Mode 2, a UE decides sidelink transmission resource(s) in time and frequency domains in a resource pool. According to agreements on a pre-emption check procedure of 3GPP Release 16 V2X, a resource pre-emption check procedure is supported by UE(s) that perform sensing, but not supported by UE(s) that do not perform any sensing (i.e., a physical sidelink control channel (PSCCH) reception); and a resource pre-emption check procedure for Mode 2 is supported. A resource pre-emption check procedure may also be named as a pre-emption check procedure or the like.
In particular, a UE triggers a resource re-selection scheme of already signaled resource(s) as a resource reservation in a case that: (1) the already signaled resource(s) is overlapped with resource(s) of a higher priority reservation from a different UE; and (2) a sidelink reference signal received power (SL-RSRP) measurement associated with the resource(s) reserved by that different UE is higher than an associated SL-RSRP threshold. For a pre-emption check procedure, both full and partial frequency domain overlap in the same slot are considered as the overlapping condition to trigger a resource re-selection scheme, and the whole resource(s) is reselected even if only a partial overlap happens. Once a resource re-selection condition associated with the pre-emption check procedure is met at a UE, a resource re-selection scheme is performed for all resources(s) which satisfy the resource re-selection condition.
According to agreements made in 3GPP RAN1 meeting, in Release 17 sidelink, a resource pool can be configured to enable full sensing only, partial sensing only, random resource selection only, or any of their combination(s). In Release 16 V2X, a UE may perform a pre-emption check procedure before a reserved sidelink transmission occasion happens. During performing a pre-emption check procedure, a UE needs to determine whether following Conditions 1-3 are fulfilled. A resource re-selection scheme will be triggered if all Conditions 1-3 are fulfilled during the pre-emption check procedure.
According to agreements in 3GPP RAN1 meeting, following three types of power sensitive UE are defined. A power sensitive UE may also be named as a power saving UE or the like.
According to agreements of 3GPP Release 17 sidelink, a resource pool can be configured with following different cases:
For the abovementioned Case 4, Case 5, Case 6, and Case 7, if a resource pool is configured with multiple resource selection schemes and/or resource sensing schemes, a pre-emption check procedure defined in Release 16 V2X may be a problem, because the pre-emption check procedure may not work due to a power sensitive UE not performing the pre-emption check procedure.
In an example, UE-1 performs a sidelink transmission with full sensing, and a UE-2 performs a sidelink transmission with a random resource selection. Before UE-1 performs the sidelink transmission on a reserved sidelink resource, UE-1 may perform a pre-emption check procedure. If the reserved sidelink resource of UE-1 is fully or partially overlapped with that of UE-2 and if a priority of UE-2's sidelink transmission is higher than a priority of UE-1's sidelink transmission, UE-2 will not trigger a resource re-selection scheme. Because UE-2 without a sidelink reception capability cannot do sensing to avoid a sidelink resource collision, the sidelink resource collision between UE-1 and UE-2 will happen.
In a further example, reserved resources of two UEs is fully or partially overlapped, and these two UEs may respectively perform sidelink transmissions on their reserved resource(s) due to one UE is a power sensitive UE and does not perform a pre-emption check procedure as expected by the other UE. Then, a sidelink resource collision between two UEs may happen. A specific example is described in
In the embodiments of
In the embodiments of
When the abovementioned Condition 1 and Condition 2 of the pre-emption check procedure are fulfilled, UE-1 will not trigger a resource re-selection scheme because Condition 3 is not fulfilled, and UE-1 expects that UE-2 can perform a pre-emption check procedure and avoid the resource collision. However, UE-2 will not perform the pre-emption check procedure, since UE-2 is a power sensitive UE without the pre-emption check procedure. Then, UE-1 and UE-2 will respectively perform sidelink transmissions on their own reserved resource(s). Thus, a sidelink resource collision between UE-1 and UE-2 may happen.
Currently, details regarding how to solve a sidelink resource collision between two sidelink UEs have not been discussed in 3GPP 5G technology yet. Embodiments of the present application aim to address a co-existence of a random resource selection scheme and other resource selection scheme(s). Embodiments of the present application define specific alternatives to solve the above issue for different cases. With the above alternatives, a UE with a pre-emption check may perform different pre-emption check behaviors for different UEs. If the UE obtains information that a resource will not be pre-emption checked by another UE, the UE may only check the abovementioned Conditions 1 and 2 of a pre-emption check procedure. Otherwise, the UE may check all the abovementioned Conditions 1-3 of the pre-emption check procedure. More details will be illustrated in the following text in combination with the appended drawings.
The embodiments of
In the exemplary method 300 as shown in
According to some embodiments, the received information may be received via sidelink control information (SCI). For example, the received information is carried in 1st stage sidelink control information (SCI) and/or 2nd stage SCI.
According to some further embodiments, the received information includes at least one of following fields:
According to some embodiments, at least one of Fields (1)-(5) within the information which is received in operation 301 may be explicitly carried in a field in SCI. For instance, the field in SCI includes 1 bit, or some reserved bit(s) defined in SCI format 1-A, SCI format 2-A, or SCI format 2-B may be used for the field.
In an embodiment, a UE implicitly informs other UEs whether it will perform a pre-emption check procedure for the UE's reserved resource(s) by at least one of following manners: 1 bit in SCI to indicate a UE type of the UE; 1 bit in SCI to indicate the UE's sidelink reception capability; 1 bit in SCI to indicate the UE's SCI reception capability; and 1 bit in SCI to indicate the UE's sensing capability. Based on the bit in SCI of these manners, other UEs may determine whether the UE will perform a pre-emption check procedure for the UE's reserved resource(s). More details are illustrated in Embodiments 1 and 2 in following text.
In a further embodiment, a UE explicitly transmits 1 bit in SCI, e.g., in 1st stage SCI or 2nd stage SCI, to indicate to other UEs whether the UE will perform a pre-emption check procedure for the UE's reserved resource(s). For example, value “1” of the bit in SCI means that the UE will perform the pre-emption check procedure, and value “0” of the bit in SCI means that the UE will not perform the pre-emption check procedure. More details are illustrated in Embodiment 3 in following text.
According to some other embodiments, at least one of Fields (2)-(5) within the information received in operation 301 may be implicitly carried by at least one of:
Referring back to
According to some embodiments, if the UE detects that both the abovementioned Condition 1 and the abovementioned Condition 2 are fulfilled (i.e., the abovementioned another reserved resource is fully or partially overlapped with the reserved resource; and a SL-RSRP measurement result associated with the abovementioned another reserved resource is higher than an associated SL-RSRP threshold), the UE may perform different behaviors in following Case A to Case G.
In particular, in each of Case A to Case E, the UE making the adjustment in operation 302 further comprises: triggering a resource re-selection scheme for the transmission on the reserved resource of the UE; and/or increasing a power of the transmission on the reserved resource of the UE. The UE increasing a power of the transmission may be implemented by performing power boosting for this transmission. For example, if a UE detects that remaining packet delay budget (PDB) of this UE is not sufficient for its resource re-selection scheme or the UE detects that remaining candidate resources are not sufficient for its resource re-selection scheme, the UE may perform power boosting for this transmission.
In following Case F or Case G, the UE making the adjustment in operation 302 further comprises: triggering a resource re-selection scheme for the transmission on the reserved resource of the UE.
Details described in the embodiments as illustrated and shown in
In the embodiments of
As shown in
In an embodiment, the information transmitted in operation 401 includes an explicit UE type indication or an implicit UE type indication. In a further embodiment, the information transmitted in operation 401 includes an explicit sidelink reception capability indication or an implicit sidelink reception capability indication. In another embodiment, the information transmitted in operation 401 includes an explicit SCI reception capability indication or an implicit SCI reception capability indication. In an additional embodiment, the information transmitted in operation 401 includes an explicit sensing capability indication or an implicit sensing capability indication.
Details described in the embodiments as illustrated and shown in
The following texts describe specific Embodiments 1-3 of the methods as shown and illustrated in
Embodiment 1 handles a case in which a UE (e.g., any of UE 102 to UE 105 illustrated and shown in
Embodiment 1 assumes that a pre-emption check procedure is not supported by a power sensitive UE (e.g., Type A UE, Type B UE, or Type D UE). In Embodiment 1, a power sensitive UE may perform a random resource selection scheme or a resource selection scheme based on partial sensing, and the power sensitive UE will not perform a pre-emption check procedure before a sidelink transmission.
In particular, according to Embodiment 1, a UE may explicitly or implicitly transmit a UE type indication to other UE(s).
In an explicit manner of Embodiment 1, the UE may transmit 1 bit in SCI (e.g., in 1st stage or 2nd stage SCI) to indicate its UE type. For instance, value “1” of the bit in SCI means that the UE is a power sensitive UE, and value “0” of the bit in SCI means that the UE is a non-power sensitive UE, or vice versa.
In an implicit manner of Embodiment 1, the UE may adopt any of following three options.
In Embodiment 1, a pre-emption check behavior may be configured as that only non-power sensitive UEs perform a pre-emption check procedure. In particular, regarding a UE's pre-emption check behavior:
Embodiment 2 handles a case in which a UE (e.g., any of UE 102 to UE 105 illustrated and shown in
Embodiment 2 assumes that a pre-emption check procedure is supported by Type D power sensitive UE, but not supported by Type A power sensitive UE or Type B power sensitive UE. In Embodiment 2, a power sensitive UE may perform a random resource selection scheme, a resource selection scheme based on partial sensing, or a resource selection scheme based on full sensing. Embodiment 2 may include following two alternatives.
Alternative 1 of Embodiment 2:
Alternative 1 of Embodiment 2 assumes that a pre-emption check procedure is mandatory for Type D power sensitive UE, and Type D power sensitive UE should perform a pre-emption check before a transmission on each reserved transmission occasion. In particular, the UE may explicitly or implicitly transmit a sidelink reception capability indication, a SCI reception capability indication, and/or a sensing capability indication.
In an explicit manner of Alternative 1, a UE may transmit 1 bit in SCI (e.g., in 1st stage SCI or 2nd stage SCI) to indicate its sidelink reception capability, its SCI reception capability, or its sensing capability. In an example, value “1” of the bit means that the UE has no sidelink reception capability, and value “0” of the bit means that the UE has a sidelink reception capability, and vice versa. In a further example, value “1” of the bit means that the UE has no SCI reception capability, and value “0” of the bit means that the UE has a SCI reception capability, and vice versa. In another example, value “1” of the bit means that the UE has no sensing capability, and value “0” of the bit means that the UE has a sensing capability, and vice versa.
In an implicit manner of Alternative 1, different RNTI values are configured for “a UE with a sidelink reception capability, a SCI reception capability, or a sensing capability” and “a UE without a sidelink reception capability, a SCI reception capability, or a sensing capability”. For example, two RNTI values can be respectively configured, pre-configured, or specified for UEs with and without a sidelink reception capability, a SCI reception capability, or a sensing capability. A RNTI value is used to scramble the CRC for 1st stage SCI and/or 2nd stage SCI. According to the RNTI value, a UE can distinguish different resource reservations from UEs with and without a sidelink reception capability, a SCI reception capability, or a sensing capability.
In Alternative 1 of Embodiment 2, regarding a pre-emption check behavior, UE(s) with a sidelink reception capability, a SCI reception capability, or a sensing capability (e.g., Type D UE and a non-power sensitive UE) will perform a pre-emption check procedure.
In particular, with reference to some embodiments of
With reference to some other embodiments of
Alternative 2 of Embodiment 2:
Alternative 2 of Embodiment 2 assumes that a pre-emption check procedure is not mandatory for Type D power sensitive UE, and Type D power sensitive UE may determine if it will perform a pre-emption check procedure by its implementation. For example, Type D power sensitive UE may determine if it will perform a pre-emption check procedure based on the remaining power, block error radio (BLER) of a previous sidelink transmission, and/or a hybrid automatic repeat request (HARD) feedback of the previous sidelink transmission. In Alternative 2 of Embodiment 2, a manner of using 1 bit in SCI to indicate a UE's sidelink reception capability doesn't work.
In Embodiment 3, a UE may directly transmit an explicit indicator to indicate whether the UE will perform a pre-emption check procedure for reserved resource(s). For instance, the indicator is carried by 1 bit in SCI, e.g., in 1st stage SCI or 2nd stage SCI. Value “1” of the bit means that the UE will perform a pre-emption check procedure for the reserved resource(s), and value “0” of the bit means that the UE will not perform a pre-emption check for the reserved resources.
For example, Type A power sensitive UE or Type B power sensitive UE may always transmit value “0” due to a loss of a sidelink reception capability. Type D power sensitive UE may always transmit value “1” if a pre-emption check procedure is mandatory for Type D power sensitive UE. Otherwise, Type D power sensitive UE may transmit value “0” or value “1” based on its implementation. A non-power sensitive UE may always transmit value “1”.
In Embodiment 3, regarding a pre-emption check behavior, for a UE which would perform a pre-emption check procedure (e.g., a non-power sensitive UE or Type D power sensitive UE):
As shown in
Although in
In some embodiments of the present application, the at least one non-transitory computer-readable medium 506 may have stored thereon computer-executable instructions which are programmed to implement the operations of the methods, for example as described in view of any of
Those having ordinary skills in the art would understand that the operations of a method described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations may be apparent to those skilled in the art. For example, various components of the embodiments may be interchanged, added, or substituted in the other embodiments. Also, all of the elements of each figure are not necessary for operation of the disclosed embodiments. For example, those having ordinary skills in the art would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the disclosure.
In this document, the terms “includes,” “including,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “a,” “an,” or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. Also, the term “another” is defined as at least a second or more. The term “having” and the like, as used herein, are defined as “including.”
Filing Document | Filing Date | Country | Kind |
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PCT/CN2021/075411 | 2/5/2021 | WO |