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WO2025153263A1 - Procédés, dispositifs de communication et équipement d'infrastructure pour retransmission préemptive et planification préventive dans un scénario de liaison latérale - Google Patents

Procédés, dispositifs de communication et équipement d'infrastructure pour retransmission préemptive et planification préventive dans un scénario de liaison latérale

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Publication number
WO2025153263A1
WO2025153263A1 PCT/EP2024/086068 EP2024086068W WO2025153263A1 WO 2025153263 A1 WO2025153263 A1 WO 2025153263A1 EP 2024086068 W EP2024086068 W EP 2024086068W WO 2025153263 A1 WO2025153263 A1 WO 2025153263A1
Authority
WO
WIPO (PCT)
Prior art keywords
communications device
infrastructure equipment
signal
communications
downlink signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/086068
Other languages
English (en)
Inventor
Shin Horng Wong
Basuki PRIYANTO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Europe Bv
Sony Group Corp
Original Assignee
Sony Europe Bv
Sony Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Europe Bv, Sony Group Corp filed Critical Sony Europe Bv
Publication of WO2025153263A1 publication Critical patent/WO2025153263A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • Previous generation mobile telecommunication systems such as those based on the 3GPP defined UMTS and Long Term Evolution (LTE) architecture, are able to support a wider range of services than simple voice and messaging services offered by previous generations of mobile telecommunication systems.
  • LTE Long Term Evolution
  • a user is able to enjoy high data rate applications such as mobile video streaming and mobile video conferencing that would previously only have been available via a fixed line data connection.
  • the demand to deploy such networks is therefore strong and the coverage area of these networks, i.e. geographic locations where access to the networks is possible, is expected to continue to increase rapidly.
  • Current and future wireless communications networks are expected to routinely and efficiently support communications with an ever-increasing range of devices associated with a wider range of data traffic profiles and types than existing systems are optimised to support.
  • it is expected future wireless communications networks will be expected to efficiently support communications with devices including reduced complexity devices, machine type communication (MTC) devices, high resolution video displays, virtual reality headsets, extended Reality (XR) and so on.
  • MTC machine type communication
  • XR extended Reality
  • Some of these different types of devices may be deployed in very large numbers, for example low complexity devices for supporting the “The Internet of Things”, and may typically be associated with the transmissions of relatively small amounts of data with relatively high latency tolerance.
  • Other types of device for example supporting high-definition video streaming, may be associated with transmissions of relatively large amounts of data with relatively low latency tolerance.
  • Other types of device may be characterised by data that should be transmitted through the network with low latency and high reliability.
  • a single device type might also be associated with different traffic profiles / characteristics depending on the application(s) it is running. For example, different considerations may apply for efficiently supporting data exchange with a smartphone when it is running a video streaming application (high downlink data) as compared to when it is running an Internet browsing application (sporadic uplink and downlink data) or being used for voice communications by an emergency responder in an emergency scenario (data subject to stringent reliability and latency requirements).
  • the present disclosure can help address or mitigate at least some of the issues discussed above.
  • Some embodiments of the present technique can provide a method of operating a first communications device configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface.
  • the method comprises receiving, from an infrastructure equipment of the wireless communications network, a downlink signal transmitted by the infrastructure equipment targeted to a second communications device, and decoding, at least partially, the downlink signal.
  • the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • FIG. 1 For embodiments of the present technique, can provide a method of operating a first communications device configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface.
  • the method comprises receiving, from a second communications device, an at least partially encoded uplink signal that is to be transmitted by the second communications device to an infrastructure equipment of the wireless communications network, and transmitting, to the infrastructure equipment, the at least partially encoded uplink signal.
  • the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Such embodiments of the present technique which, in addition to methods of operating communications devices, relate to methods of operating infrastructure equipment, to communications devices and infrastructure equipment, to circuitry for communications devices and infrastructure equipment, to wireless communications systems, to computer programs, and to computer-readable storage mediums, can allow for the more efficient and effective use of radio resources by a communications device operating in a wireless communications network.
  • Figure 1 schematically represents some aspects of an NR-type wireless telecommunications system which may be configured to operate in accordance with certain embodiments of the present disclosure
  • Figure 2 is a schematic block diagram of an example infrastructure equipment and communications device which may be configured to operate in accordance with certain embodiments of the present disclosure
  • FIG. 4 illustrates an example of Physical Downlink Shared Channel (PDSCH) Hybrid Automatic Repeat Request (HARQ) transmission
  • PDSCH Physical Downlink Shared Channel
  • HARQ Hybrid Automatic Repeat Request
  • Figure 1 provides a schematic diagram illustrating an example configuration of a wireless communications network which uses some of the terminology used in NR and 5G but which may also support other radio access technologies, and which may be adapted to implement embodiments of the disclosure as described herein.
  • Various elements of Figure 1 and certain aspects of their respective modes of operation are well-known and defined in the relevant standards administered by the 3GPP (RTM) body. It will be appreciated that operational aspects of the telecommunications networks discussed herein which are not specifically described (for example in relation to specific communication protocols and physical channels for communicating between different elements) may be implemented in accordance with any known techniques, for example according to the relevant standards and known proposed modifications and additions to the relevant standards.
  • a plurality of transmission and reception points (TRPs) 10 are connected to distributed control units (DUs) 41, 42 by a connection interface represented as a line 16.
  • the TRP 10 may be connected to another TRP (not shown in Figure 1) that is connected to DUs 41, 42.
  • This connectivity can be a wireless connectivity.
  • the TRP 10 can be a non-stationary TRP.
  • Each of the TRPs 10 is arranged to transmit and receive signals via a wireless access interface within a radio frequency bandwidth available to the wireless communications network.
  • each of the TRPs 10 forms a coverage area (i.e.
  • a communications device 14 is represented in Figure 1 within the coverage area of the first communication cell 12. This communications device 14 may thus exchange signalling with the first central unit 40 in the first communication cell 12 via one of the distributed units / TRPs 10 associated with the first communication cell 12. Communications devices 14 may also be referred to as mobile stations, user equipment (UE), user terminal, mobile radio, terminal device, and so forth.
  • UE user equipment
  • certain embodiments of the disclosure as discussed herein may be implemented in wireless telecommunication systems / networks according to various different architectures, such as the example architecture shown in Figure 2. It will thus be appreciated the specific wireless telecommunications architecture in any given implementation is not of primary significance to the principles described herein.
  • certain embodiments of the disclosure may be described generally in the context of communications between network infrastructure equipment / access nodes and a communications device, wherein the specific nature of the network infrastructure equipment / access node and the communications device will depend on the network infrastructure for the implementation at hand.
  • the network infrastructure equipment / access node may comprise a control unit / controlling node 40 and / or a TRP 10 of the kind shown in Figure 1 which is adapted to provide functionality in accordance with the principles described herein.
  • a TRP 10 as shown in Figure 1 comprises, as a simplified representation, a wireless transmitter 30, a wireless receiver 32 and a controller or controlling processor 34 which may operate to control the transmitter 30 and the wireless receiver 32 to transmit and receive radio signals to one or more UEs 14 within a cell 12 formed by the TRP 10.
  • an example UE 14 is shown to include a corresponding transmitter 49, a receiver 48 and a controller 44 which is configured to control the transmitter 49 and the receiver 48 to transmit signals representing uplink (UL) data to the wireless communications network via the wireless access interface formed by the TRP 10 and to receive downlink (DL) data as signals transmitted by the transmitter 30 and received by the receiver 48 in accordance with the conventional operation.
  • UL uplink
  • DL downlink
  • the transmitters 30, 49 and the receivers 32, 48 may include radio frequency filters and amplifiers as well as signal processing components and devices in order to transmit and receive radio signals in accordance for example with the 5G/NR standard.
  • the controllers 34, 44 (as well as other controllers described in relation to examples and embodiments of the present disclosure) may be, for example, a microprocessor, a CPU, or a dedicated chipset, etc., configured to carry out instructions which are stored on a computer readable medium, such as a non-volatile memory.
  • Such services include eMBB, IIoT and URLLC as discussed above, but also include such services as 2-step Random Access (RACH), Unlicensed NR (NR-U), Cross-link Interference (CLI) handling for Time Division Duplexing (TDD), Positioning, Small Data Transmissions (SDT), Multicast and Broadcast Services (MBS), Reduced Capability UEs, Vehicular Communications (V2X), Integrated Access and Backhaul (IAB), UE power saving, Non Terrestrial Networks (NTN), NR operation up to 71GHz, loT over NTN, Non-public networks (NPN), extended Reality (XR) for NR, and Radio Access Network (RAN) slicing.
  • RACH 2-step Random Access
  • NR-U Unlicensed NR
  • CLI Cross-link Interference
  • TDD Time Division Duplexing
  • SDT Positioning
  • MMS Multicast and Broadcast Services
  • V2X Vehicular Communications
  • IAB Integrated Access and Backhaul
  • NTN Non Terrestrial
  • a subnetwork is a localized network of communication points. Subnetworks have the following characteristics:
  • subnetwork links which can be downlink, uplink, or sidelink, make such subnetworks links suitable for replacing wires, thereby reducing the amount of wiring required in the system, which in some cases, e.g., in a car or robot, would result in a significant reduction of their weights and size. Reducing the amount of wiring required in a system or unit would also make manufacturing and installation of that system or unit easier.
  • a subnetwork can also be in a living room for the purpose of providing immersive Virtual Reality (VR) entertainment.
  • VR Virtual Reality
  • An example of such a home entertainment based subnetwork 61 is shown in Figure 3B, where a user’s headset 63, movement sensors 64 in the user’s haptic gloves, and a fan 65 that blows wind at intensity depending on the scenario currently being experienced in the immersive VR entertainment content may together all form a subnetwork which connects to multiple APs 62.
  • a subnetwork can also be within a single machine, such as a robot arm 71 as shown in the example of Figure 3C.
  • the sensors, joints, and pneumatic systems used to control movements, along with one or more APs 72 may together all form a subnetwork.
  • this may significantly reduce the amount of required wiring, which in turn would allow for the robot arm 80 to be made smaller and lighter.
  • HARQ Hybrid Automatic Repeat Request
  • physical channels carrying data such as Physical Downlink Shared Channels (PDSCHs) and Physical Uplink Shared Channels (PUSCHs).
  • PDSCHs Physical Downlink Shared Channels
  • PUSCHs Physical Uplink Shared Channels
  • HARQ transmissions consist, after the initial transmission of the physical channels carrying the data, of HARQ feedback from the receiver and, if necessary, retransmissions from the transmitter. For example, an initial transmission of a physical channel may be transmitted to a receiver, and the receiver would feed back an ACK if it successfully decodes the physical channel, or otherwise it feeds back a NACK.
  • a retransmission of the physical channel may be transmitted to the receiver if the HARQ feedback for the previous or initial transmission was a NACK, and here, the receiver would soft-combine the logarithmic likelihood ratio (LLR) soft bits of the retransmitted physical channel with all previous transmissions of the same physical channel. This would thereby increase the signal-to-noise ratio (SNR) of the transmission, and after the soft combining, the receiver then attempts to decode the transmission again.
  • LLR logarithmic likelihood ratio
  • SNR signal-to-noise ratio
  • FIG. 4 An example of PDSCH HARQ transmissions in the DL is shown in Figure 4, where a DL Grant carried by downlink control information (DCI#1) is transmitted to a UE in Slot n to schedule a PDSCH#1 in Slot «+I with a corresponding PUCCH#1 (i.e. a Physical Uplink Control Channel) in sub-slot m+5 (Slot «+2) to carry the HARQ feedback for PDSCH# 1.
  • the UE fails to decode PDSCH# 1 and therefore feeds back a NACK in PUCCH#1.
  • the gNB receiving the NACK would send another DL Grant DCI#3 in Slot «+3 scheduling a retransmission of a PDSCH# 1 in the later part of Slot n+3 with a corresponding PUCCH#3 in sub-slot m+9 (Slot n+4).
  • the UE soft-combines PDSCH# 1 received in Slot w+1 with PDSCH#1 in Slot n+3, thereby increasing the SNR of the physical channel, and here, the UE successfully decodes PDSCH# 1 and so feeds back an ACK using PUCCH#3.
  • the total time required for the UE to successfully receive PDSCH# 1 is the time between h and tn.
  • the HARQ Round Trip Time is the time between the transmission of the PDSCH and its following retransmission.
  • the HARQ RTT is the time between time h and tn, which consists of processing time at both the UE and gNB.
  • a Send and Wait (SAW) mechanism is employed for HARQ transmissions, where during the HARQ RTT of one HARQ process, another HARQ process can occur so that the resources can be fully utilised for data transmissions.
  • DL Grant DCI#2 in Slot w+1 schedules a PDSCH#2 in Slot n+2 with a corresponding PUCCH#2 in sub-slot m+ (Slot w+4), where PDSCH#2 occurs between the initial PDSCH#1 in Slot n+1 and the PDSCH#1 retransmission in Slot n+3.
  • the gNB and UE keep track of the HARQ process using a HARQ Process Number (HPN), and the UE maintains a soft buffer for each HARQ process for soft combining.
  • HPN HARQ Process Number
  • HARQ transmissions in the uplink for PUSCH is similar to those in the downlink for PDSCH as described above.
  • Figure 11 shows a part schematic, part message flow diagram representation of a second wireless communications system comprising a first communications device 141 (e.g. a UE 14), an infrastructure equipment 142 (e.g. an AP such as a gNB / TRP 10), and a second communications device 143 (e.g. a UE 14) in accordance with at least some embodiments of the present technique.
  • a first communications device 141 e.g. a UE 14
  • an infrastructure equipment 142 e.g. an AP such as a gNB / TRP 10
  • second communications device 143 e.g. a UE 14
  • FIG. 12 An example is shown in Figure 12, where a subnetwork has five UEs 153-157 and two proximity groups 151, 152 in the same manner as the example of Figure 8.
  • UE1 153, UE2 154, and UE3 155 form a first proximity group 151 and UE4 156 and UE5 157 form a second proximity group 152.
  • the AP 150 schedules a PUSCH for UE1 153, and here, in addition to UE1 ’s 153 transmission 158 of the scheduled PUSCH, UE2 154 also transmits 159 the same PUSCH to the AP 150, providing transmit diversity and thereby improved reliability for that PUSCH.
  • the diversity UE transmits a fully encoded uplink packet such as a PUSCH or CG-PUSCH (i.e. a configured grant PUSCH) of a targeted UE to the AP.
  • a fully encoded uplink packet such as a PUSCH or CG-PUSCH (i.e. a configured grant PUSCH) of a targeted UE to the AP.
  • the at least partially encoded uplink signal received from the second communications device and transmitted to the infrastructure equipment may be a fully encoded uplink signal.
  • the network may configure the eavesdropping UE to fully or partially decode a PDSCH, for example, it may configure one eavesdropping UE to fully decode a PDSCH and another eavesdropping UE to partially decode a PDSCH (e.g., just the DMRS or soft bits).
  • the first communications device may be configured by the infrastructure equipment either to partially decode the downlink signal or to fully decode the downlink signal.
  • the AP may configure a diversity UE to transmit a fully encoded PUSCH, i.e., encoded from info bits or a partially encoded PUSCH, i.e., modulated from soft bits.
  • the first communications device may be configured by the infrastructure equipment either to partially encode the uplink signal or to fully encode the uplink signal.
  • the network configuration can be cell / subnetwork specific, proximity group specific, or UE specific.
  • a new RNTI (as part of the PDCCH) is introduced. That is, a Proximity RNTI is used to mask the CRC of the DL Grant or UL Grant, where the Proximity RNTI is read by the UEs configured for eavesdropping or diversity. This enables the eavesdropping UE or diversity UE to decode the DL Grant and UL Grant, so that they can receive or transmit the PDSCH or PUSCH respectively.
  • the Proximity RNTI may also be used for encoding the PDSCH and PUSCH.
  • the first control signal may comprise a radio network temporary identifier, RNTI, wherein the RNTI is for use by the first communications device in decoding a second control signal transmitted by the infrastructure equipment to the second communications device, wherein the second control signal schedules the downlink signal or the uplink signal.
  • RNTI radio network temporary identifier
  • the RNTI of one or more target UE in a proximity group is broadcasted to the UEs in the proximity group, for example, using a group common DCI (GC-DCI).
  • Eavesdropping and diversity UEs may be configured to monitor this said GC-DCI.
  • the first communications device is configured by the infrastructure equipment to decode the downlink signal and/or to transmit the uplink signal by receiving at least one RNTI in a broadcast signal from the infrastructure equipment, wherein one of the RNTIs (i.e. the RNTI of the second communications device) is for use by the first communications device in decoding a control signal transmitted by the infrastructure equipment to the second communications device, wherein the control signal schedules the downlink signal or the uplink signal.
  • an AP may group-broadcast the C-RNTI of a target UE, followed by (or together with) a DL Grant for that target UE.
  • the UEs in the proximity group may decide to read the DL Grant and decode the corresponding PDSCH.
  • this is different to the previously described arrangements in which the DL Grant and UL Grant are directly masked with a Proximity RNTI.
  • the C-RNTI of a target UE is broadcast and the eavesdropping or diversity UEs would then use that C- RNTI to decode a DL Grant and/or UL Grant that is dedicated to the target UE.
  • Such arrangements also enable a target UE to know that it is the target UE by comparing its own C-RNTI with the C-RNTI broadcast by the AP in the said GC-DCI.
  • a time window may be defined after the AP broadcasts the RNTI of the target UE to which the DL Grant and/or UL Grant will be transmitted.
  • the broadcast signal comprises an indication of a time window in which the first communications device can use the RNTI to decode the control signal transmitted by the infrastructure equipment to the second communications device.
  • the time window information can be pre-configured (e.g., configured by the RRC) or defined in the specifications.
  • FIG. 13 An example is shown in Figure 13, where at time to, the AP transmits a GC-DCI indicating two target UEs’ RNTI; i.e., C-RNTI# 1 and C-RNTI#2.
  • the said time window starts after the end of the GC-DCI at time ti and ends at time t «.
  • the eavesdropping or diversity UEs can monitor for a DL Grant or UL Grant of the target UEs in addition to their individual DL/UL Grants.
  • a DL Grant with C-RNTI#2 is transmitted in time C, which schedules a PDSCH in time t 4 .
  • the eavesdropping UE can be configured to pass the fully or partially decoded PDSCH to the target UE.
  • the first communications device may be configured to receive, from the infrastructure equipment, an indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device, wherein the first communications device transmits the at least partially decoded downlink signal to the second communications device based on receiving the indication.
  • This configuration can be configured by the RRC or indicated dynamically via a DCI.
  • the eavesdropping UE can be configured to send a HARQ feedback for the PDSCH of a target UE.
  • the first communications device may be configured to receive, from the infrastructure equipment, an indication that the first communications device is to transmit the feedback signal to the infrastructure equipment, wherein the first communications device transmits the feedback signal to the infrastructure equipment based on receiving the indication.
  • This configuration can be configured by the RRC or indicated dynamically via a DCI.
  • the target UE will expect that PDSCH in a predetermined time.
  • the said predetermined time can be RRC configured or indicated in the DCI.
  • the indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device may comprise an indication of a time window in which the first communications device is to transmit the at least partially decoded downlink signal to the second communications device.
  • the eavesdropping UE fails to decode the PDSCH, it may not pass the PDSCH to the target UE as it may not be beneficial to do so. In such case the target UE will blind decode for the presence of the PDSCH, e.g. by detecting the DMRS of the PDSCH.
  • the eavesdropping UE transmits an indication to the target UE whether it will transmit or not transmit the PDSCH to the target UE.
  • the first communications device may be configured to transmit to the second communications device, before transmitting the at least partially decoded downlink signal to the second communications device, an indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device.
  • the target UE reads the HARQ feedback of the eavesdropping UE. That is, the HARQ feedback indicating the decoding outcome of the target UE’s PDSCH by the eavesdropping UE acts as an indication whether the target UE should expect a PDSCH from the eavesdropping UE.
  • the eavesdropping UE fails to decode the target UE’s PDSCH, it will send a NACK to the gNB and the target UE reading the NACK will know that the eavesdropping UE may not pass the PDSCH to the target UE since it failed to decode it.
  • the target UE reading the ACK will know that the eavesdropping UE will pass the PDSCH to the target UE since the eavesdropping UE successfully decoded the PDSCH.
  • Figure 14 shows a flow diagram illustrating a first example process of communications in a communications system in accordance with embodiments of the present technique.
  • the process shown by Figure 14 is specifically a method of operating a first communications device (i.e. UE) configured to transmit signals to and/or to receive signals from a wireless communications network (i.e. to an infrastructure equipment which may be an AP such as a gNB) via a wireless access interface.
  • a first communications device i.e. UE
  • a wireless communications network i.e. to an infrastructure equipment which may be an AP such as a gNB
  • the method begins in step Si l.
  • the method comprises, in step S12, receiving, from an infrastructure equipment of the wireless communications network, a downlink signal transmitted by the infrastructure equipment targeted to a second communications device.
  • the process comprises decoding, at least partially, the downlink signal.
  • the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • the process ends in step S14.
  • Figure 15 shows a flow diagram illustrating a second example process of communications in a communications system in accordance with embodiments of the present technique.
  • the process shown by Figure 15 is specifically a method of operating a first communications device (i.e. UE) configured to transmit signals to and/or to receive signals from a wireless communications network (i.e. to an infrastructure equipment which may be an AP such as a gNB) via a wireless access interface.
  • a first communications device i.e. UE
  • a wireless communications network i.e. to an infrastructure equipment which may be an AP such as a gNB
  • Paragraph 1 A method of operating a first communications device configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface, the method comprising receiving, from an infrastructure equipment of the wireless communications network, a downlink signal transmitted by the infrastructure equipment targeted to a second communications device, and decoding, at least partially, the downlink signal, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 15 A method according to Paragraph 13 or Paragraph 14, wherein the one or more channel characteristics comprise a maximum modulation and coding scheme, MCS, that, if the downlink signal had been transmitted in accordance with the maximum MCS, the first communications device would have been able to successfully receive the downlink signal in accordance with a predefined error rate.
  • MCS modulation and coding scheme
  • Paragraph 23 A method according to Paragraph 22, comprising transmitting, to the infrastructure equipment, an indication of the estimation of whether or not the first communications device is able to fully decode the downlink signal.
  • Paragraph 25 A method according to Paragraph 24, comprising receiving, from the infrastructure equipment, an indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device, wherein the first communications device transmits the at least partially decoded downlink signal to the second communications device based on receiving the indication.
  • Paragraph 30 A method of operating an infrastructure equipment forming part of a wireless communications network configured to transmit signals to and/or to receive signals from a plurality of communications devices via a wireless access interface, the method comprising transmitting, to each of a first and a second of the plurality of communications devices, a downlink signal targeted at the second communications device, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 32 A method according to Paragraph 30 or Paragraph 31, comprising transmitting a first control signal to the first communications device, wherein the first control signal indicates that the communications device is to decode the downlink signal.
  • Paragraph 33 A method according to Paragraph 32, wherein the first control signal comprises a radio network temporary identifier, RNTI, wherein the RNTI is for use by the first communications device in decoding a second control signal transmitted by the infrastructure equipment to the second communications device, wherein the second control signal schedules the downlink signal.
  • RNTI radio network temporary identifier
  • Paragraph 34 A method according to any of Paragraphs 30 to 33, comprising broadcasting a broadcast signal comprising at least one RNTI, wherein the first communications device is configured by the infrastructure equipment to decode the downlink signal by receiving the broadcast signal, wherein one of the RNTIs is for use by the first communications device in decoding a control signal transmitted by the infrastructure equipment to the second communications device, wherein the control signal schedules the downlink signal.
  • Paragraph 35 A method according to Paragraph 34, wherein the broadcast signal comprises an indication of a time window in which the first communications device can use the RNTI to decode the control signal transmitted by the infrastructure equipment to the second communications device.
  • Paragraph 36 A method according to Paragraph 34 or Paragraph 35, wherein the broadcast signal comprises an indication of a set of time resources of the wireless access interface in which the infrastructure equipment is to transmit the control signal to the second communications device.
  • Paragraph 37 A method according to any of Paragraphs 30 to 36, comprising receiving, from the first communications device, a feedback signal indicating whether or not the first communications device successfully decoded the downlink signal.
  • Paragraph 38 A method according to Paragraph 37, comprising transmitting, to the first communications device, an indication that the first communications device is to transmit the feedback signal to the infrastructure equipment, wherein the infrastructure equipment receives the feedback signal from the first communications device based on transmitting the indication.
  • Paragraph 39 A method according to Paragraph 37 or Paragraph 38, comprising transmitting, to the second communications device based on receiving the feedback signal from the first communications device, an indication that the infrastructure equipment is to retransmit the downlink signal to the second communications device.
  • Paragraph 40 A method according to any of Paragraphs 30 to 39, comprising transmitting, to the infrastructure equipment, an indication of one or more channel characteristics determined by the first communications device by at least partially decoding the downlink signal.
  • Paragraph 41 A method according to Paragraph 40, wherein the one or more channel characteristics comprise a signal to interference and noise ratio, SINR, of the downlink signal.
  • Paragraph 42 A method according to Paragraph 40 or Paragraph 41, wherein the one or more channel characteristics comprise a maximum modulation and coding scheme, MCS, that, if the downlink signal had been transmitted in accordance with the maximum MCS, the first communications device would have been able to successfully receive the downlink signal in accordance with a predefined error rate.
  • MCS modulation and coding scheme
  • Paragraph 43 A method according to any of Paragraphs 40 to 42, comprising determining, based on the received indication of the one or more channel characteristics, one or more transmission parameters in accordance with which the infrastructure equipment will transmit future downlink signals to the first communications device and/or to the second communications device.
  • Paragraph 44 A method according to any of Paragraphs 40 to 43, comprising determining, based on the received indication of the one or more channel characteristics, whether or not to remove the first communications device and/or the second communications device from the proximity group.
  • Paragraph 45 A method according to any of Paragraphs 30 to 44, comprising receiving, from the first communications device, an indication of an estimation of whether or not the first communications device is able to fully decode the downlink signal.
  • Paragraph 46 A method according to any of Paragraphs 30 to 45, comprising transmitting, to the first communications device, an indication that the first communications device is to transmit, after at least partially decoding the downlink signal, the at least partially decoded downlink signal to the second communications device via a sidelink interface between the first communications device and the second communications device.
  • Paragraph 47 A method according to Paragraph 46, wherein the indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device comprises an indication of a time window in which the first communications device is to transmit the at least partially decoded downlink signal to the second communications device.
  • Paragraph 48 A method according to any of Paragraphs 30 to 45, comprising transmitting, to the first communications device, an indication that the first communications device is to transmit, after at least partially decoding the downlink signal, the at least partially decoded downlink signal to the second communications device via a sidelink interface between the first communications device and the second communications device.
  • An infrastructure equipment forming part of a wireless communications network, the infrastructure equipment comprising transceiver circuitry configured to transmit signals to and/or to receive signals from a plurality of communications devices via a wireless access interface, and controller circuitry configured in combination with the transceiver circuitry to transmit to each of a first and a second of the plurality of communications devices, a downlink signal targeted at the second communications device, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 50 A method of operating a second communications device configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface, the method comprising receiving, from a first communications device via a sidelink interface between the first communications device and the second communications device, a downlink signal that has been at least partially decoded by the first communications device, wherein the downlink signal was transmitted by an infrastructure equipment of the wireless communications network targeted to the second communications device, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 51 A method according to Paragraph 50, comprising receiving the downlink signal from the infrastructure equipment.
  • Paragraph 52 A method according to Paragraph 50 or Paragraph 51, comprising receiving the at least partially decoded downlink signal from the first communications device within a specified time window.
  • Paragraph 53 A method according to any of Paragraphs 50 to 52, comprising receiving, from the first communications device, before receiving the at least partially decoded downlink signal from the first communications device, an indication that the first communications device is to transmit the at least partially decoded downlink signal to the second communications device.
  • Paragraph 54 A method according to any of Paragraphs 50 to 53, comprising receiving, from the infrastructure equipment, an indication that the infrastructure equipment is to retransmit the downlink signal to the second communications device before the second communications device sends a feedback signal to the infrastructure equipment indicating that the second communications device had failed to decode the downlink signal.
  • Paragraph 55 A method according to any of Paragraphs 50 to 54, comprising receiving an indication of a feedback signal transmitted by the first communications device to the infrastructure equipment, the feedback signal indicating whether or not the first communications device successfully decoded the downlink signal.
  • a second communications device comprising transceiver circuitry configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface, and controller circuitry configured in combination with the transceiver circuitry to receive, from a first communications device via a sidelink interface between the first communications device and the second communications device, a downlink signal that has been at least partially decoded by the first communications device, wherein the downlink signal was transmitted by an infrastructure equipment of the wireless communications network targeted to the second communications device, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Circuitry for a second communications device comprising transceiver circuitry configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface, and controller circuitry configured in combination with the transceiver circuitry to receive, from a first communications device via a sidelink interface between the first communications device and the second communications device, a downlink signal that has been at least partially decoded by the first communications device, wherein the downlink signal was transmitted by an infrastructure equipment of the wireless communications network targeted to the second communications device, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 58 A wireless communications system comprising a first communications device according to Paragraph 28 and an infrastructure equipment according to Paragraph 48.
  • Paragraph 59 A wireless communications system according to Paragraph 58, further comprising a second communications device according to Paragraph 56.
  • Paragraph 60 A method of operating a first communications device configured to transmit signals to and/or to receive signals from a wireless communications network via a wireless access interface, the method comprising receiving, from a second communications device, an at least partially encoded uplink signal that is to be transmitted by the second communications device to an infrastructure equipment of the wireless communications network, and transmitting, to the infrastructure equipment, the at least partially encoded uplink signal, wherein the first communications device and the second communications device each form part of a proximity group of a subnetwork of the wireless communications network, the subnetwork comprising at least the first communications device, the second communications device, and the infrastructure equipment.
  • Paragraph 61 A method according to Paragraph 60, wherein the at least partially encoded uplink signal received from the second communications device and transmitted to the infrastructure equipment is a fully encoded uplink signal.
  • Paragraph 66 A method according to any of Paragraphs 60 to 65, comprising receiving, from the infrastructure equipment, an indication of a first set of uplink resources of the wireless access interface in which to transmit the at least partially encoded uplink signal to the infrastructure equipment.
  • Paragraph 67 A method according to any of Paragraphs 60 to 66, comprising receiving, from the infrastructure equipment, an indication of a first set of uplink resources of the wireless access interface, wherein the transmitting the at least partially encoded uplink signal to the infrastructure equipment comprises transmitting the at least partially encoded uplink signal to the infrastructure equipment in the first set of uplink resources with an indication that the at least partially encoded uplink signal is to be transmitted by the second communications device to the infrastructure equipment.
  • Paragraph 68 A method according to any of Paragraphs 60 to 67, comprising receiving, from the infrastructure equipment, a feedback signal indicating whether or not the infrastructure equipment successfully decoded the uplink signal.
  • Paragraph 93 A method according to Paragraph 92, wherein the at least partially encoded uplink signal transmitted to the first communications device is a fully encoded uplink signal.
  • Paragraph 94 A method according to Paragraph 92 or Paragraph 93, wherein the at least partially encoded uplink signal is transmitted to the first communications device via a sidelink interface between the first communications device and the second communications device.
  • Paragraph 95 A method according to any of Paragraphs 92 to 94, wherein the at least partially encoded uplink signal transmitted to the first communications device comprises logarithmic likelihood ratios, LLRs, of each bit of the uplink signal.
  • Paragraph 99 A wireless communications system according to Paragraph 98, further comprising a second communications device according to Paragraph 96.
  • Paragraph 100 A computer program comprising instructions which, when loaded onto a computer, cause the computer to perform a method according to any of Paragraphs 1 to 27, Paragraphs 30 to 47, Paragraphs 50 to 55, Paragraphs 60 to 75, Paragraphs 78 to 89, or Paragraphs 92 to 94.
  • Described embodiments may be implemented in any suitable form including hardware, software, firmware or any combination of these. Described embodiments may optionally be implemented at least partly as computer software running on one or more data processors and/or digital signal processors.
  • the elements and components of any embodiment may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units. As such, the disclosed embodiments may be implemented in a single unit or may be physically and functionally distributed between different units, circuitry and/or processors.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un premier dispositif de communication configuré pour transmettre des signaux à un réseau de communication sans fil et/ou pour recevoir des signaux en provenance d'un réseau de communication sans fil par l'intermédiaire d'une interface d'accès sans fil. Le procédé consiste à recevoir, en provenance d'un équipement d'infrastructure du réseau de communication sans fil, un signal de liaison descendante transmis par l'équipement d'infrastructure ciblé vers un second dispositif de communication, et à décoder, au moins partiellement, le signal de liaison descendante. Ici, le premier dispositif de communication et le second dispositif de communication font chacun partie d'un groupe de proximité d'un sous-réseau du réseau de communication sans fil, le sous-réseau comprenant au moins le premier dispositif de communication, le second dispositif de communication et l'équipement d'infrastructure.
PCT/EP2024/086068 2024-01-17 2024-12-12 Procédés, dispositifs de communication et équipement d'infrastructure pour retransmission préemptive et planification préventive dans un scénario de liaison latérale Pending WO2025153263A1 (fr)

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EP24152458 2024-01-17

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WO2021127196A1 (fr) * 2019-12-18 2021-06-24 Qualcomm Incorporated Procédés et appareils de retransmission de données utilisant une diversité de liaison latérale
US20220263605A1 (en) * 2021-02-18 2022-08-18 Qualcomm Incorporated Harq procedure for cooperative relay in sidelink networks
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WO2021127196A1 (fr) * 2019-12-18 2021-06-24 Qualcomm Incorporated Procédés et appareils de retransmission de données utilisant une diversité de liaison latérale
US20220263605A1 (en) * 2021-02-18 2022-08-18 Qualcomm Incorporated Harq procedure for cooperative relay in sidelink networks
US20220408445A1 (en) * 2021-06-21 2022-12-22 Intel Corporation Link adaptation for 5g systems
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