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EP-4122264-B1 - NR SIDELINK DISCONTINUOUS RECEPTION RESOURCE ALLOCATION

EP4122264B1EP 4122264 B1EP4122264 B1EP 4122264B1EP-4122264-B1

Inventors

  • Selvanesan, Sarun
  • GÖKTEPE, Baris
  • FEHRENBACH, THOMAS
  • WIRTH, THOMAS
  • SCHIERL, THOMAS
  • HELLGE, CORNELIUS

Dates

Publication Date
20260506
Application Date
20210318

Claims (15)

  1. A user device, UE, (302) for a wireless communication system (310), the wireless communication system (310) including a plurality of user devices, UEs, (302, 304), wherein the UE (302) is to communicate with one or more further UEs (304) using a sidelink, SL, (308), wherein the UE (302) is to operate in a Discontinuous Reception, DRX, mode, and wherein, when being out-of-coverage, the UE (302) is to obtain one or more resources available for a transmission • from an assistance information message, AIM, received from one or more of the further UEs (304) during an ON duration of one or more DRX cycles, and/or • from an assistance information message, AIM, received from one or more of the further UEs (304) during a listening duration, and/or • by carrying out sensing in a set of sidelink resources or in a sidelink resource pool of the wireless communication system (310) during an ON duration of one or more DRX cycles, and/or • by carrying out sensing in a set of sidelink resources or in a sidelink resource pool of the wireless communication system (310) during a listening duration, characterized in that the listening duration comprises one or more of: • one listening duration preceding the ON duration, the one listening duration being consecutive with the ON duration or being offset from the ON duration by a certain time, • one listening duration following the ON duration, the one listening duration being consecutive with the ON duration or being offset from the ON duration by a certain time, • a plurality of listening durations preceding the ON duration, the respective listening durations being offset from each other by a certain time, • a plurality of listening durations following the ON duration, the respective listening durations being offset from each other by a certain time • an ON duration of the DRX cycle during which the UE (302) is to listen only to control messages and the one or more AIMs. and when the UE (302) obtains resources available for a transmission by carrying out sensing during the listening duration, the UE (302) is to carry out only sensing or receiving of AIMs during the listening duration and is not to transmit or decode any control and/or data during the listening duration.
  2. The user device, UE, (302) of claim 1, wherein the UE (302) is to obtain the one or more resources available for a transmission from the AIM and from the sensing results.
  3. The user device, UE, (302) of claim 2, wherein, when the UE (302) is to obtain the one or more resources available for a transmission from the AIM and from the sensing results, the UE (302) is to • prefer the sensing results over the resources in the AIM, e.g., by overriding resources in the AIM by the sensing results, or • prefer the resources in the AIM over the sensing results, e.g., by overriding the sensing results by resources in the AIM, or • use a combination of the resources indicated in the AIM as well as the resources indicated in the sensing results, or • use one among a plurality of AIMs.
  4. The user device, UE, (302) of any one of the preceding claims, wherein, when the UE (302) obtains resources available for a transmission from an AIM, the UE (302) is not to carry out any type of sensing and rely on one or more of the further UEs (304) in the UE's vicinity to carry out sensing and select resources available for a transmission by the UE (302).
  5. The user device, UE, (302) of any one of the preceding claims, wherein the UE (302) is to receive the AIM as a control packet, e.g., via a PC5 RRC signaling, or as a MAC CE signaling, or as a data packet from the one or more of the further UEs, (304), or as an information block, e.g., a sidelink information block, SLIB.
  6. The user device, UE, (302) of any one of the preceding claims, wherein the UE (302) is to receive the AIM for one of more data packets to be transmitted, and to use the resources indicated in the AIM for the transmission of the data packet for which the AIM was received.
  7. The user device, UE, (302) of any one of the preceding claims, wherein the UE (302) is to request the one or more AIMs.
  8. The user device, UE, (302) of any one of the preceding claims, wherein the UE (302) is to request the one or more AIMs, e.g., when the UE (302) • requires assistance in the resource allocation procedure, and/or • has selected a certain DRX-configuration, and/or • the power status of the UE (302) is below a configured and/or pre-configured threshold.
  9. The user device, UE, (302) of claim 8, wherein the UE (302) requires assistance in the resource allocation procedure in one or more of the following cases: • a transmission of one or more packets requires a high reliability and/or a low latency, • inadequate or no sensing results are available at the UE (302), e.g., in case of a change of resource pools, • the UE's power level is below a configured and/or pre-configured threshold, • the UE (302) wants improve its power consumption by reducing sensing efforts and limit sensing to a configured and/or pre-configured set of resources/resource pools.
  10. The user device, UE, (302) of any one of the preceding claims, wherein, the UE (302) obtains resources available for a transmission by carrying out sensing during an ON duration of one or more DRX cycles.
  11. The user device, UE, (302) of claim 10, wherein, responsive to a regular DRX cycle configuration, the UE (302) is expected to carry out sensing whenever it is in the ON duration.
  12. The user device, UE, (302) of any one of the preceding claims, wherein the UE (302) is to carry out sensing during the listening duration and during at least a part of the ON duration, e.g., responsive to a regular DRX cycle configuration indicating the listening duration.
  13. The user device, UE, (302) of any one of the preceding claims, wherein, when being out-of-coverage, the UE (302) • is not connected to a base station of the wireless communication system (310), e.g., the UE (302) operates in Mode 2 or is not in an RRC connected state, so that the UE (302) does not receive from the base station a sidelink resource allocation configuration or assistance, and/or • is connected to a base station of the wireless communication system (310), which, for one or more reasons, is not capable to provide a sidelink resource allocation configuration or assistance for the UE (302), and/or • is connected to a base station of the wireless communication system (310) not supporting a sidelink service, like a NR V2X service, e.g., a GSM, UMTS or LTE base station.
  14. A wireless communication system (310), comprising a plurality of user devices, UEs, (302) of any one of the preceding claims and configured for a sidelink communication using, for example resources from a set of sidelink resources of the wireless communication system (310).
  15. A method for operating a user device, UE, (302) of a wireless communication system (310) including a plurality of user devices, UEs, (302, 304), the method comprising: operating the UE (302) to communicate with one or more further UEs (304) using a sidelink, SL, (308), operating the UE (302) in a Discontinuous Reception, DRX, mode, and when being out-of-coverage, obtaining, by the UE (302), one or more resources available for a transmission • from an assistance information message, AIM, received from one or more of the further UEs (304) during an ON duration of one or more DRX cycles, and/or • from an assistance information message, AIM, received from one or more of the further UEs (304) during a listening duration, and/or • by carrying out sensing in a set of sidelink resources or in a sidelink resource pool of the wireless communication system (310) during an ON duration of one or more DRX cycles, and/or • by carrying out sensing in a set of sidelink resources or in a sidelink resource pool of the wireless communication system (310) during a listening duration, characterized in that the listening duration comprises one or more of: • one listening duration preceding the ON duration, the one listening duration being consecutive with the ON duration or being offset from the ON duration by a certain time, • one listening duration following the ON duration, the one listening duration being consecutive with the ON duration or being offset from the ON duration by a certain time, • a plurality of listening durations preceding the ON duration, the respective listening durations being offset from each other by a certain time, • a plurality of listening durations following the ON duration, the respective listening durations being offset from each other by a certain time • an ON duration of the DRX cycle during which the UE (302) is to listen only to control messages and the one or AIMs, and when the UE (302) obtains resources available for a transmission by carrying out sensing during the listening duration, carrying out only sensing or receiving of AIMs during the listening duration and not transmitting or decoding any control and/or data during the listening duration.

Description

The present application relates to the field of wireless communication systems or networks, more specifically to a discontinuous reception, DRX, on a sidelink, SL. Embodiments of the present invention concern the resource allocation in case of a DRX on a SL. Fig. 1 is a schematic representation of an example of a terrestrial wireless network 100 including, as is shown in Fig. 1(a), a core network 102 and one or more radio access networks RAN1, RAN2, ...RANN. Fig. 1(b) is a schematic representation of an example of a radio access network RANn that may include one or more base stations gNB1 to gNB5, each serving a specific area surrounding the base station schematically represented by respective cells 1061 to 1065. The base stations are provided to serve users within a cell. The one or more base stations may serve users in licensed and/or unlicensed bands. The term base station, BS, refers to a gNB in 5G networks, an eNB in UMTS/LTE/LTE-A/ LTE-A Pro, or just a BS in other mobile communication standards. A user may be a stationary device or a mobile device. The wireless communication system may also be accessed by mobile or stationary loT devices which connect to a base station or to a user. The mobile devices or the loT devices may include physical devices, ground based vehicles, such as robots or cars, aerial vehicles, such as manned or unmanned aerial vehicles, UAVs, the latter also referred to as drones, buildings and other items or devices having embedded therein electronics, software, sensors, actuators, or the like as well as network connectivity that enables these devices to collect and exchange data across an existing network infrastructure. Fig. 1(b) shows an exemplary view of five cells, however, the RANn may include more or less such cells, and RANn may also include only one base station. Fig. 1(b) shows two users UE1 and UE2, also referred to as user equipment, UE, that are in cell 1062 and that are served by base station gNB2. Another user UE3 is shown in cell 1064 which is served by base station gNB4. The arrows 1081, 1082 and 1083 schematically represent uplink/downlink connections for transmitting data from a user UE1, UE2 and UE3 to the base stations gNB2, gNB4 or for transmitting data from the base stations gNB2, gNB4 to the users UE1, UE2, UE3. This may be realized on licensed bands or on unlicensed bands. Further, Fig. 1(b) shows two loT devices 1101 and 1102 in cell 1064, which may be stationary or mobile devices. The loT device 1101 accesses the wireless communication system via the base station gNB4 to receive and transmit data as schematically represented by arrow 1121. The loT device 1102 accesses the wireless communication system via the user UE3 as is schematically represented by arrow 1122. The respective base station gNB1 to gNB5 may be connected to the core network 102, e.g., via the S1 interface, via respective backhaul links 1141 to 1145, which are schematically represented in Fig. 1(b) by the arrows pointing to "core". The core network 102 may be connected to one or more external networks. The external network may be the Internet, or a private network, such as an Intranet or any other type of campus networks, e.g., a private WiFi or 4G or 5G mobile communication system. Further, some or all of the respective base station gNB1 to gNB5 may be connected, e.g., via the S1 or X2 interface or the XN interface in NR, with each other via respective backhaul links 1161 to 1165, which are schematically represented in Fig. 1(b) by the arrows pointing to "gNBs". A sidelink channel allows direct communication between UEs, also referred to as device-to-device, D2D, communication. The sidelink interface in 3GPP is named PC5. For data transmission a physical resource grid may be used. The physical resource grid may comprise a set of resource elements to which various physical channels and physical signals are mapped. For example, the physical channels may include the physical downlink channel, PDSCH, the physical uplink shared channel, PUSCH, and the physical sidelink shared channel, PSSCH, carrying user specific data, also referred to as downlink, uplink or sidelink payload data, the physical broadcast channel, PBCH, and the physical sidelink broadcast channel, PSBCH, carrying for example a master information block, MIB, and one or more of a system information block, SIB, one or more sidelink information blocks (SLIBs) if supported, the physical downlink control channel, PDCCH, the physical uplink control channel, PUCCH, and the physical sidelink control channels, PSSCH, carrying for example the downlink control information, DCI, the uplink control information, UCI, or the sidelink control information, SCI. The sidelink interface may also support a 2-stage SCI, which refers to a first control region containing some parts of the SCI, and, optionally, a second control region, which contains a second part of control information. For the uplink, the physical channels may further include the phys