Enhanced Resource Allocation for Sidelink Communication

Abstract

Embodiments of the present invention provide a method and device for sidelink resource allocation in an NR network. In one exemplary case, sensing and resource allocation based on RXUE are provided. The sensing based on RXUE works independently or works together with the sensing and resource allocation based on TXUE. In one embodiment, the RXUE performs sensing and measures the RSRP by performing SCI decoding on the SCI of other UEs. The RXUE determines whether the reserved resources are acceptable based on the sensing result obtained from the measured RSRP result and the threshold. The RXUE indicates the acceptability of the reserved resources to the TXUE. In one embodiment, the acceptability information is carried by an additional bit multiplexed with the A / N bit. In another embodiment, the acceptability information is not multiplexed with the A / N bit. In yet another embodiment, the acceptability information is transmitted on the feedback resource indicated by the received SCI. By using the present invention, the resource allocation of sidelink communication can be better performed.

Description

[0001] Cross-reference

[0002] This application is filed under 35 USC § 111(a), and claims the priority of the international application No. PCT / CN / 2020 / 085708, titled "Resource Allocation Enhancement for SL Communication", filed on April 20, 2020, based on and claiming the benefit of 35 USC § 120 and § 365(c), and incorporates the above application by reference. Technical Field

[0003] The present invention relates to wireless communication, and more particularly to resource allocation enhancement for sidelink (SL). Background Art

[0004] 5G radio access technology will become a key component of modern access networks, which will address the high traffic growth and the increasing demand for high-bandwidth connections. In 3GPP new radio (NR), SL is continuously evolving. With the supported new features, SL provides low latency, high reliability, and high throughput for device-to-device communication. SL measurements are supported in NR vehicle-to-everything (V2X). Unicast, multicast, and broadcast can all support V2X SL communication. During sidelink establishment, the transmitting UE and the receiving UE perform discovery in mode 1 or mode 2. Resources are selected from a common resource pool configured by the network. Resource allocation for sidelink communication is important. When the discovery of the selected resources fails, new resources will be selected. To support efficient sidelink communication, sidelink needs to consider resource allocation for efficient discovery.

[0005] There is a need for improvement and enhancement in resource allocation for sidelink communication. Summary of the Invention

[0006] Embodiments of the present invention provide a method and device for sidelink resource allocation in an NR network. In an exemplary example, sensing and resource allocation based on the RX UE are provided. The sensing based on the RX UE works independently or in conjunction with the sensing and resource allocation based on the TX UE. In one embodiment, the RX UE performs sensing by performing SCI decoding on the SCI of other UEs, and measures the RSRP on the DMRS of the PSCCH and / or the associated PSCCH / PSSCH. If one or more reserved resources indicated in the SCI of the peer TX UE are the same in the time domain as the sensing resources reserved by other UEs and completely / partially overlap in the frequency domain, the RX UE determines whether the reserved resources are acceptable based on the sensing result derived from the measured RSRP result and the threshold. The RX UE indicates the acceptability of the reserved resources to the TX UE. In one embodiment, the acceptability information is carried by an additional bit multiplexed with the A / N bit. In another embodiment, the acceptability information is not multiplexed with the A / N bit. In yet another embodiment, the acceptability information is transmitted on the feedback resources indicated in the received SCI.

[0007] This section of content is not intended to define the present invention, which is defined by the claims.

[0008] By utilizing the present invention, resource allocation for sidelink communication can be better performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings illustrate embodiments of the present invention, where the same numbers indicate the same components.

[0010] Figure 1 is a schematic diagram of a system of an exemplary wireless network for enhanced resource allocation for sidelink communication according to an embodiment of the present invention.

[0011] Figure 2 is a schematic diagram of an exemplary NR wireless system with a centralized upper layer having an NR radio interface stack according to an embodiment of the present invention.

[0012] Figure 3 is a schematic diagram for comparing resource allocation based on the TX UE with resource allocation considering RX UE sensing in sidelink communication according to an embodiment of the present invention.

[0013] Figure 4 is a schematic flowchart of enhanced resource selection considering RX UE sensing information according to an embodiment of the present invention.

[0014] Figure 5 is a schematic diagram of a sensing process for enhanced sidelink resource allocation according to an embodiment of the present invention.

[0015] Figure 6It is a schematic diagram of an exemplary process for determining acceptability for sidelink resource allocation enhancement according to an embodiment of the present invention.

[0016] Figure 7 It is a schematic diagram of an exemplary process for reporting acceptability information for sidelink resource allocation enhancement according to an embodiment of the present invention.

[0017] Figure 8 It is a schematic diagram of an exemplary RX UE feedback timing for sidelink resource allocation enhancement according to an embodiment of the present invention.

[0018] Figure 9 It is an exemplary flowchart for sidelink resource allocation enhancement according to an embodiment of the present invention. Detailed implementation manners

[0019] Some embodiments of the present invention are now given in detail as references, and their examples are described in the drawings.

[0020] Figure 1 It is a schematic diagram of a system of an exemplary wireless network for resource allocation enhancement for sidelink communication according to an embodiment of the present invention. The wireless system 100 includes one or more fixed infrastructure units forming a network distributed over a geographical area. The basic unit may also be referred to as an access point, access terminal, base station, Node B, evolved Node B (eNode-B), next-generation Node B (gNB), or other terms used in the art. The network may be a homogeneous network or a heterogeneous network, and may be deployed using the same or different frequencies. gNB 101 is an exemplary base station in the NR network.

[0021] The wireless network 100 also includes multiple communication devices or mobile stations, such as user equipment (UE) 111, 112, 113, 114, 115, 116, and 117. Exemplary mobile devices in the wireless network 100 have SL capabilities. The mobile devices can establish one or more connections with one or more base stations, such as gNB 101. UE 111 has an access link with gNB 101, including an uplink (UL) and a downlink (DL). UE 112, which is also served by gNB 101, can also establish UL and DL with gNB 101. UE 111 establishes SL with UE 112. Both UE 111 and UE 112 are devices within the coverage area. Mobile devices on vehicles (e.g., mobile devices 113, 114, and 115) also have SL capabilities. Mobile devices 113 and 114 are covered by gNB 101. The device 113 within the coverage area establishes SL with the device 114 within the coverage area. The mobile device 115 on the vehicle is a device outside the coverage area. The mobile device 114 within the coverage area establishes SL with the device 115 outside the coverage area. In other embodiments, mobile devices such as UE 116 and 117 may all be outside the coverage area, but can send and receive packet data via sidelink with one or more other mobile devices.

[0022] Figure 1 A simplified block diagram of a base station and a mobile device / UE for enhanced resource allocation is further illustrated. gNB 101 has an antenna 156 for transmitting and receiving radio signals. The RF transceiver circuit 153 coupled to the antenna receives RF signals from the antenna 156, converts the RF signals into baseband signals, and sends the baseband signals to the processor 152. The RF transceiver 153 also converts the baseband signals received from the processor 152 into RF signals and sends them to the antenna 156. The processor 152 processes the received baseband signals and invokes different functional modules to perform the functional characteristics in gNB 101. The memory 151 stores program instructions and data 154 to control the operation of gNB 101. gNB 101 also includes a set of control modules 155 for performing functional tasks to communicate with mobile stations. The control modules can be implemented by circuits, software, firmware, or a combination of the above.

[0023] UE 111 has an antenna 165 for transmitting and receiving radio signals. The RF transceiver circuit 163 coupled to the antenna receives RF signals from the antenna 165, converts the RF signals into baseband signals, and sends the baseband signals to the processor 162. In one embodiment, the RF transceiver may include two RF modules (not shown). The first RF module is for high-frequency (HF) transmission and reception; the other RF module, different from the HF transceiver, is for transmission and reception in different frequency bands. The RF transceiver 163 also converts the baseband signals received from the processor 162 into RF signals and sends them to the antenna 165. The processor 162 processes the received baseband signals and invokes different functional modules to perform the functional features in the UE 111. The memory 161 stores program instructions and data 164 to control the operation of the UE 111. The antenna 165 sends an uplink transmission to the antenna 156 of the gNB 101 and receives a downlink transmission from the antenna 156 of the gNB 101.

[0024] UE 111 also includes a set of control modules for performing functional tasks. These functional modules can be implemented by circuits, software, firmware, or a combination of the above. The sidelink configuration module 191 receives a sidelink configuration for performing sidelink operations using SL in the NR network. The sidelink configuration is configured by the network and / or pre-configured by the UE. The sensing module 192 performs sensing based on the sidelink control information (SCI) received from the transmitting UE to obtain reference signal received power (RSRP) measurement results, where the received SCI includes the current resources at the current time and one or more reserved resources for subsequent transmissions. The sidelink resource module 193 determines the acceptability of one or more reserved resources for subsequent transmissions based on one or more sensing results. The sidelink reporting module 194 sends the acceptability information of one or more reserved resources to the transmitting UE based on the determined acceptability.

[0025] Figure 2FIG. is a schematic diagram of an exemplary NR radio system with a centralized upper layer having an NR radio interface stack. There may be different protocol partitioning options between the central unit (CU) and the distributed unit (DU) of the gNB node. The functional partitioning between the CU and the DU of the gNB node may depend on the transport layer. Since the higher protocol layers have lower performance requirements for the transport layer in terms of bandwidth, latency, synchronization, and jitter, the low-performance transport between the CU and the DU of the gNB node can enable the higher protocol layers of the NR radio stack to be supported in the CU. In one embodiment, the service data adaptation protocol (SDAP) and the packet data convergence protocol (PDCP) layers are located in the CU, while the radio link control (RLC), media access control (MAC), and physical (PHY) layers are located in the DU. The core unit 201 is connected to the central unit 211 having the gNB upper layer 252. In one embodiment 250, the gNB upper layer 252 includes the PDCP layer and an optional SDAP layer. The central unit 211 is connected to the distributed units 221, 222, and 223, where the distributed units 221, 222, and 223 correspond to cells 231, 232, and 233, respectively. The distributed units 221, 222, and 223 include the gNB lower layer 251. In one embodiment, the gNB lower layer 251 includes the PHY, MAC, and RLC layers. In another embodiment 260, each gNB has a protocol stack 261 including the SDAP, PDCP, RLC, MAC, and PHY layers.

[0026] Figure 3It is an exemplary diagram for comparing resource allocation based on the TX UE with resource allocation considering RX UE sensing in sidelink communication according to an embodiment of the present invention. In an NR network, UEs 301 and 302 establish Uu links with gNB 303. In step 311, UE301 (RX UE) receives a resource configuration including a common resource pool for sidelink from gNB 303. In step 312, UE 302 (TX UE) receives a resource configuration including a common resource pool for sidelink from gNB 303. In one embodiment, TX UE 302 initiates mode 2 discovery by selecting resources based on TX UE sensing. Process 310 shows resource allocation based only on the TX UE. In step 321, UE 302 sends a discovery message such as a mode 2 related message using resources based on TX UE sensing. After the discovery message fails, in step 322, TX UE 302 retransmits the discovery message. In one embodiment, TX UE302 reselects new resources based only on the TX UE. After the second discovery message fails, in step 323, TX UE 302 retransmits the discovery message again. Since the TX UE relies only on its own results, the delay caused by failed discovery messages or any other messages is uncertain. The TX UE needs to retry the above messages until successful, or trigger other conditions. The delay caused by failed discovery messages or any other messages is uncertain. The TX UE needs to retry the above messages until successful, or trigger other conditions.

[0027] In an example, for SL resource allocation, a resource allocation mechanism based on RX UE sensing can be applied to improve reliability and reduce overall delay. In one embodiment, the resource allocation based on the RX UE can be applied independently. In another embodiment, the resource allocation based on the RX UE is applied in combination with the resource allocation mechanism based on TXUE sensing. Process 320 shows sidelink resource allocation considering RX UE sensing. In step 331, UE 302 sends a discovery message such as a message related to mode 2 using resources based on TX UE sensing. In step 332, RX UE 301 sends acceptability information to TX UE 302. The acceptability information is based on the sensing performed by RX UE 301. In step 333, considering the acceptability information received from RX UE 301, TX UE 302 sends another discovery message via resources. In one embodiment, TX UE 302 reselects resources based only on RX UE sensing. In another embodiment, TX UE 302 reselects resources based on both RX UE sensing and TX UE sensing. Compared with process 310, process 320 reduces the delay caused by reselecting resources. The delay in process 320 is more predictable.

[0028] Figure 4It is an exemplary flowchart of resource selection enhancement considering RX UE sensing information according to an embodiment of the present invention. In an NR network, Uu links are established between UE 401 and UE 402 and gNB 403. UE 401 and UE 402 are respectively configured with SL resources in steps 411 and 412. In step 421, UE 401 (RX UE) receives a resource configuration including a common resource pool for the sidelink from gNB 403. In step 422, UE 402 (TX UE) receives a resource configuration including a common resource pool for the sidelink from gNB 403. RX UE 401 performs sensing based on the received SL resource configuration in step 431. In one embodiment, sensing is performed on one or more interfering peer UEs that reserve resources identical to one or more resources indicated in the received SCI. In one embodiment, sensing is performed on the current resources indicated in the SCI. In other embodiments, sensing is performed on one or more reserved resources indicated in the SCI. TX UE 402 performs sensing based on the received SL resource configuration in step 432. In step 441, a data packet for transmission to RX UE 401 arrives at TX UE 402. In step 442, TX UE 402 selects resources for sidelink transmission based on its own sensing. In step 451, TX UE 402 uses the selected sidelink resources to transmit to RX UE 401. In one embodiment, the transmission includes sidelink data traffic, current sidelink resources, and sidelink resources reserved for subsequent transmissions, as well as optionally preferred feedback resources for use by the RX UE.

[0029] In step 461, RX UE 401 determines the acceptability of the sidelink resources. In one embodiment, RSRP measurements can be performed on the current resources indicated in the received SCI. The acceptability of one or more reserved resources is determined based on the RSRP measurement of the current resources. When the RSRP is higher than a predefined threshold, the acceptability is determined to be unacceptable. In other embodiments, the acceptability is further based on one or more other factors, including the relevant transmission priorities of the current resources of the TX UE, the relevant transmission priorities of one or more reserved resources of the TX UE, the relevant transmission priorities of one or more interfering peer UEs, and the RSRP measurements of one or more interfering peer UEs. In one embodiment, the RX UE determines the acceptability based on one or more factors, including the RSRP on the resources used by the TX UE, the current and reserved resources indicated in the SCI received from the TX UE, the transmission priority of the TX UE, the sensing results from one or more interfering peer UEs (which have resources conflicting with or identical to one or more resources indicated in the SCI), the RSRP from one or more interfering peer UEs, and the corresponding transmission priorities of the peer interfering UEs.

[0030] At step 462, the RX UE 401 sends acceptability information to the TX UE 402. In one embodiment, the acceptability information is a 1-bit indicator indicating whether the resources reserved for the first subsequent time are acceptable. In another embodiment, the acceptability information includes a preference resource list or a non-preference resource list. At step 471, when determining that a sidelink resource needs to be reselected, the TX UE 402 reselects the sidelink resource considering the acceptability information received from the RX UE 401. At step 481, the TX UE 401 performs transmission to the RX UE 401 using the reselected resources. In one embodiment, the transmission includes sidelink data traffic, new / updated reserved resource information, and optionally preferred feedback resources for the RX UE to use.

[0031] Figure 5 is an exemplary schematic diagram of a sensing process for enhanced sidelink resource allocation according to an embodiment of the present invention. In one example, the sidelink resource allocation of the TX UE is based on the information sensed by the RX UE. At step 511, the RX UE decodes one or more SCIs from the corresponding one or more TX UEs. The RX UE performs sensing based on the SCI decoding of the SCIs of other UEs. The received SCI includes the current resources at the current time and (optionally) one or more resources reserved for subsequent transmissions. In one embodiment, the SCI 520 from the TX UE includes {R0_T0, R1_T1, R2_T2}. R0 521 is the sidelink resource at the current time T0. R1 522 is the sidelink resource reserved for the first subsequent time T1. R2 523 is the sidelink resource reserved for the second subsequent time T2. In other embodiments, one or more reserved resources are included in the TX UE SCI received by the RX UE. At step 512, the RX UE measures the RSRP. In one embodiment, the RSRP measurement is performed on the demodulation reference signal (DMRS) of the physical sidelink control channel (PSCCH) and / or the associated PSCCH / physical sidelink shared channel (PSSCH). If the reserved resources indicated in the SCI from the peer TX UE are the same as or overlap with the sensed resources, then at step 513, the RX UE determines whether the reserved resources are acceptable based on the sensing result derived from the measured RSRP result and a threshold. The RX UE will indicate the acceptability of the reserved resources to the TX UE.

[0032] Figure 6It is an exemplary schematic diagram of a process for determining acceptability for enhanced sidelink resource allocation according to an embodiment of the present invention. RSRP measurement is performed at the RX UE. At step 611, the RX UE obtains the result of the RSRP measurement. At step 621, the RX UE determines whether the obtained RSRP is higher than a threshold. In one embodiment, the threshold for comparison with the RSRP result is determined as a function of the priority indicated by other UEs in the SCI and the priority indicated by the peer TX UE in the SCI. For example, if the RSRP measured on the sensed / reserved resources is higher than the threshold corresponding to a certain priority relationship between the peer TX UE and other TX UEs, the RX UE will indicate that the above resources are unacceptable. Otherwise, the RX UE may indicate that the above resources are acceptable.

[0033] If the determination at step 621 is yes, the RX UE determines at step 651 that the reserved resources are unacceptable. If the determination at step 621 is no, the RX UE determines at step 652 that the reserved resources are acceptable. If only some of the reserved resources in the frequency domain are unacceptable, such as one or several reserved sub-channels being unacceptable, all the resources reserved in the frequency domain will be regarded as "unacceptable". In another embodiment, the ratio of the unacceptable (or acceptable) resources in the reserved time slot to all the resources in the frequency domain can be compared with a threshold to determine whether the resources are acceptable. For example, if the unacceptable ratio is higher than the corresponding high-frequency band threshold, it is regarded as "unacceptable" resources; or if the acceptable ratio is lower than the corresponding low-frequency band threshold, it is regarded as "unacceptable" resources. In yet another embodiment, the summed RSRP results from multiple other TX UEs are compared with a total threshold to determine the acceptability of the reserved resources occupied by multiple other TX UEs. The reference signal received quality (RSRQ) and / or the received signal strength indicator (RSSI) can be used alone or together with the RSRP for evaluation. In one embodiment, the threshold related to the acceptability determination is pre-configured for the UE. In another embodiment, the threshold related to the acceptability determination is configured through PC5-RRC signaling between UEs or Uu RRC signaling between the UE and the BS.

[0034] Figure 7FIG. is a schematic diagram illustrating an exemplary process for reporting acceptability information for enhanced sidelink resource allocation according to an embodiment of the present invention. After determining acceptability, the RX UE sends the acceptability information to the TX UE. In one embodiment, the acceptability information 730 is a preferred resource list 731 and / or a non-preferred resource list 732. In one embodiment, to indicate the preferred and / or non-preferred resource lists, resources in the time domain are indicated by a bitmap, where 1 bit indicates whether the resource in the corresponding time slot exists in the total next / subsequent N time slots. In another embodiment, a 1-bit indicator 750 is used for the acceptability information.

[0035] In one embodiment 710, the acceptability information is sent to the TX UE based on one or more preferred feedback resources in the SCI (such as the first-phase SCI or the second-phase SCI). The preferred feedback resources indicated in the received SCI may carry the preferred and / or non-preferred resource list 730. The preferred feedback resources indicated in the received SCI may also carry the 1-bit indicator 750. If multiple feedback resources are indicated in 710, the RX UE selects one of them by considering the RX UE sensing result. In one embodiment, whether the feedback resource is included in the received SCI is dynamically configured. The received SCI includes an indicator regarding whether the feedback resource is included in the received SCI. In another embodiment, whether the feedback resource is included in the received SCI is pre-configured. In one embodiment, if the peer TX UE indicates multiple reserved resources in the SCI, the RX UE indicates whether each resource is acceptable. For example, based on the mapping between the bit position and the reserved resources, 1 bit in the bitmap may indicate whether one of the multiple reserved resources indicated in the SCI is acceptable or unacceptable. In this case, multiple bits may be carried, each corresponding to each reserved resource in the SCI from the TX UE, for indicating resource acceptability. This acceptability feedback information is sent together with the channel carrying ACK / NACK (A / N), such as the sequence-based physical sidelink feedback channel (PSFCH) channel, or the payload-based feedback channel, such as the PUSCH / PSSCH type hybrid automatic repeat request (HARQ) feedback channel. In another embodiment, the acceptability information is sent by the RX UE through the SCI (the first-phase SCI or the second-phase SCI) with or without A / N information.

[0036] In another embodiment 720, the acceptability information is transmitted on the PSFCH. In embodiment 721, the acceptability information is carried by an additional bit multiplexed with the A / N bit. In embodiment 722, the acceptability information is not multiplexed with the A / N bit. In one embodiment, the RX UE only indicates the acceptability of the first resource reserved in the SCI, that is, if the TX UE reserves one or more resources in the SCI, one bit is used to indicate the acceptability of the first reserved resource for the next / first subsequent transmission. This feedback information on the resource acceptability is sent together with the PSFCH or carried in the PSFCH, and is indicated by a bit other than the A / N bit. For example, in addition to the 1 bit for A / N in the PSFCH, the PSFCH carries another 1 bit to indicate whether the first subsequent reserved resource is acceptable based on the sensing result of the RX UE. In another embodiment, the RX UE is configured or pre-configured with two A / N-pair resources. For example, A / N-pair resource-1 indicates "acceptable", and A / N-pair resource-2 indicates "unacceptable", and vice versa. Since the time / frequency relationship between the data transmission associated with the SCI and the corresponding PSFCH resources is known, the TX UE knows how to interpret the received acceptability indication of the corresponding reserved resources.

[0037] In one embodiment, upon receiving an acceptability indication or a non-preferred resource, the TX UE performs resource reselection based on a re-evaluation by excluding the unacceptable and / or non-preferred resources for updated resource reservation and / or transmission. In one embodiment, for the re-evaluation, the sensing result of the TX UE can be jointly considered to make a decision. In another embodiment, upon receiving a preferred resource, the TX UE performs resource reselection based on a re-evaluation by prioritizing the resources preferred by the RX UE.

[0038] In one embodiment, if channel state information (CSI) reporting for a subchannel or subband that includes a set of subchannels is supported, reporting may be performed only for acceptable resources or subbands. If reporting is performed in the SCI or a physical layer channel, the reported CSI result may be associated with acceptability information. In another embodiment, subchannel or subband CSI reporting may be transmitted in a MAC CE or a MAC header. For example, if a frequency resource is indicated as acceptable, a corresponding CSI report will be appended. A bitmap or 1 bit may be used to indicate the presence of a CSI report. For example, one bit in the bitmap may indicate the presence of a CSI report in the corresponding subchannel or subband. For unacceptable resources, the bit for the CSI report may be set to a value indicating the absence of a CSI report for the corresponding resource. This can save signaling overhead for CSI (RI, PMI, and / or CQI) reporting to avoid unnecessary CSI reporting.

[0039] Figure 8 FIG. 4 is an exemplary diagram of an RX UE feedback timing for sidelink resource allocation enhancement according to an embodiment of the present invention. After determining the acceptability information, the RX UE determines the feedback timing to transmit the acceptability information. The feedback timing is configured with reference to the timing information in the received SCI, where the timing information includes the current time T0, the next or first subsequent time T1, and the second subsequent time T2. In Embodiment 810, the acceptability information is multiplexed with A / N. The feedback timing 811 is at T0 + N, where N is the number of time slots. One additional bit for the acceptability information is at a predetermined number of time slots after the current time. In one embodiment, N = 4. When the acceptability information is multiplexed with A / N, the feedback timing is set to T0 + 4. In Embodiment 820, the acceptability information is multiplexed with A / N. The feedback timing 821 is at T1 - X. X is the processing time considering HARQ readiness and resource reselection and / or reevaluation. One additional bit for the acceptability information is at a few time slots before the first subsequent transmission time, where the number of time slots is determined based on the HARQ readiness processing time and the resource reselection processing time. In Embodiment 830, the acceptability information is not multiplexed with A / N. The feedback timing 831 is at T1 - Y. Y is the processing time considering resource reselection and / or reevaluation. When the acceptability information is not multiplexed with A / N bits, the acceptability information is at a few time slots before the first subsequent transmission time, where the number of time slots is determined based on the resource reselection processing time.

[0040] Figure 9FIG. 0 is an exemplary flowchart for enhanced sidelink resource allocation according to an embodiment of the present invention. At step 901, a UE receives sidelink (SL) configuration for SL operations using SL in a wireless network. At step 902, the UE performs sensing based on a sidelink control information (SCI) received from a transmitting UE to obtain a reference signal received power (RSRP) measurement result, where the received SCI includes a current resource at a current time and one or more reserved resources for subsequent transmissions. At step 903, the UE determines the acceptability of one or more reserved resources for subsequent transmissions based on one or more sensing results. At step 904, the UE sends acceptability information of one or more reserved resources to the transmitting UE based on the determined acceptability.

[0041] Although the present invention has been described in connection with specific embodiments for purposes of illustration, the present invention is not limited thereto. Accordingly, various modifications, adaptations, and combinations of the various features of the described embodiments may be made without departing from the scope of the invention as set forth in the claims.

Claims

1. A resource allocation method for sidelink communication, comprising: receiving, by a user equipment in a wireless network, a sidelink configuration for performing sidelink operations using the sidelink; performing sensing based on sidelink control information SCI received from a transmitting user equipment to obtain a reference signal received power RSRP measurement, wherein the received SCI includes a current resource at a current time and one or more reserved resources for subsequent transmissions; determining the acceptability of the one or more reserved resources for subsequent transmissions based on one or more sensing results; and sending, based on the determined acceptability, acceptability information for the one or more reserved resources to the transmitting user equipment, wherein the acceptability information is sent on a physical sidelink feedback channel.

2. The resource allocation method for sidelink communication according to claim 1, wherein, performing an RSRP measurement on the current resource indicated in the received SCI, and determining the acceptability of the one or more reserved resources based on the RSRP measurement of the current resource, and when the RSRP is higher than a predefined threshold, the acceptability is determined to be unacceptable.

3. The resource allocation method for sidelink communication according to claim 1, wherein, the sensing is performed on one or more interfering peer user equipments that reserve resources identical to one or more resources indicated in the received SCI.

4. The resource allocation method for sidelink communication according to claim 3, wherein, the acceptability is further based on one or more of the following factors, including the relevant transmission priority of the current resource of the transmitting user equipment, the relevant transmission priority of the one or more reserved resources of the transmitting user equipment, the relevant transmission priority of one or more interfering peer user equipments, and one or more RSRP measurements of the interfering peer user equipments.

5. The resource allocation method for sidelink communication according to claim 1, wherein, the acceptability information is carried by an additional bit multiplexed with ACK / NACK bits.

6. The resource allocation method for sidelink communication according to claim 5, wherein, the additional bit for the acceptability information is located at a predetermined number of time slots after the current time.

7. The resource allocation method for sidelink communication according to claim 5, wherein, the additional bit for the acceptability information is located at several time slots before a first subsequent transmission time, and the number of the time slots is determined based on a hybrid automatic repeat request preparation processing time and a resource reselection processing time.

8. The resource allocation method for sidelink communication according to claim 1, wherein, when the acceptability information is not multiplexed with ACK / NACK bits, the acceptability information is located at several time slots before a first subsequent transmission time, and the number of the time slots is determined based on a resource reselection processing time.

9. The resource allocation method for sidelink communication according to claim 1, It is characterized in that the acceptability information is sent on a feedback resource indicated in the received SCI.

10. The resource allocation method for sidelink communication according to claim 9, It is characterized in that the feedback resource is selected from a plurality of preferred feedback resources indicated in the received SCI based on the sensed result.

11. The resource allocation method for sidelink communication according to claim 9, It is characterized in that the received SCI includes an indicator for indicating whether the feedback resource is included in the received SCI.

12. The resource allocation method for sidelink communication according to claim 1, It is characterized in that the acceptability information includes a list of preferred resources or a list of non-preferred resources.

13. A user equipment, comprising: a transceiver for transmitting and receiving radio frequency signals in a wireless network; a sidelink configuration module for receiving sidelink configuration for sidelink operation using sidelink in the wireless network; a sensing module for performing sensing based on sidelink control information SCI received from a transmitting user equipment to obtain a reference signal received power RSRP measurement, wherein the received SCI includes a current resource at a current time and one or more reserved resources for subsequent transmissions; a sidelink resource module for determining the acceptability of the one or more reserved resources for subsequent transmissions based on one or more sensing results; and a sidelink reporting module for sending acceptability information for the one or more reserved resources to the transmitting user equipment based on the determined acceptability, wherein the acceptability information is sent on a physical sidelink feedback channel.

14. The user equipment according to claim 13, It is characterized in that performing an RSRP measurement on the current resource indicated in the received SCI, and determining the acceptability of the one or more reserved resources based on the RSRP measurement of the current resource, and when the RSRP is higher than a predefined threshold, the acceptability is determined to be unacceptable.

15. The user equipment according to claim 13, It is characterized in that the acceptability information is carried on a physical sidelink feedback channel by an additional bit multiplexed with ACK / NACK bits.

16. The user equipment according to claim 15, It is characterized in that the additional bit for the acceptability information is located at a predetermined number of time slots after the current time.

17. The user equipment according to claim 13, It is characterized in that the acceptability information is at several time slots before a first subsequent transmission time, and the number of the time slots is determined at least based on a resource reselection processing time.

18. The user equipment according to claim 13, It is characterized in that the acceptability information is sent on a feedback resource indicated in the received SCI.

19. The user equipment according to claim 13, It is characterized in that the acceptability information includes a list of preferred resources or a list of non-preferred resources.

20. A storage medium stores a program which, when executed, causes a user equipment to perform the steps of the resource allocation method for sidelink communication according to any one of claims 1-12.

Images