WO2021155849A1 - Réservation de ressources pour transmissions de liaison latérale - Google Patents

Réservation de ressources pour transmissions de liaison latérale Download PDF

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Publication number
WO2021155849A1
WO2021155849A1 PCT/CN2021/075630 CN2021075630W WO2021155849A1 WO 2021155849 A1 WO2021155849 A1 WO 2021155849A1 CN 2021075630 W CN2021075630 W CN 2021075630W WO 2021155849 A1 WO2021155849 A1 WO 2021155849A1
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Prior art keywords
reservation
transmission
destination
mobile station
resources
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PCT/CN2021/075630
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English (en)
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Virgile Garcia
Umer Salim
Mohamed-Achraf Khsiba
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Jrd Communication (Shenzhen) Ltd
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    • 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—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the following disclosure relates to management of pre-emption for sidelink transmissions in cellular networks.
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards a broadband and mobile system.
  • UE User Equipment
  • RAN Radio Access Network
  • CN Core Network
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • NR is proposed to utilise an Orthogonal Frequency Division Multiplexed (OFDM) physical transmission format.
  • OFDM Orthogonal Frequency Division Multiplexed
  • NR has added a lot of capabilities and technical features to the wireless strategies going way beyond LTE for operation on licensed spectrum.
  • the NR protocols are intended to offer options for operating in unlicensed radio bands, to be known as NR-U.
  • NR-U When operating in an unlicensed radio band the gNB and UE must compete with other devices for physical medium/resource access. For example, Wi-Fi, NR-U, and LAA may utilise the same physical resources.
  • NR is intended to support Ultra-reliable and low-latency communications (URLLC) and massive Machine-Type Communications (mMTC) are intended to provide low latency and high reliability for small packet sizes (typically 32 bytes) .
  • URLLC Ultra-reliable and low-latency communications
  • mMTC massive Machine-Type Communications
  • a user-plane latency of 1ms has been proposed with a reliability of 99.99999%, and at the physical layer a packet loss rate of 10 -5 or 10 -6 has been proposed.
  • mMTC services are intended to support a large number of devices over a long life-time with highly energy efficient communication channels, where transmission of data to and from each device occurs sporadically and infrequently. For example, a cell may be expected to support many thousands of devices.
  • the disclosure below relates to various improvements to cellular wireless communications systems.
  • This disclosure provides a method of sidelink transmission between mobile stations in a cellular communications network, the method comprising the steps of transmitting a first reservation from a first mobile station, wherein the first reservation reserves a plurality of discrete blocks of transmission resources and indicates a destination mobile station for the discrete blocks; transmitting data in a first of the discrete blocks; and transmitting a second reservation from the first UE, wherein the second reservation is for at least a second of the discrete blocks of transmission resources subsequent to the first discrete block, wherein the second reservation includes a different destination address for the second discrete block than the destination specified in the first reservation; and transmitting data from the first UE in the second discrete block to the destination address for that discrete block which was in the second reservation.
  • the first and second reservations may be sidelink control information messages.
  • the sidelink control information messages may be two-part sidelink control information messages.
  • the destination address may be in the second part of the two-part sidelink control information message.
  • the method may further comprise the step of receiving a configuration message from a base station indicating whether it is permissible to change the destination for previously reserved discrete blocks of transmission resources.
  • the configuration may relate to one or more resource pools of transmission resources.
  • the priority of the transmission in the second of the discrete blocks may be the same or higher than the priority of the transmission for which the second discrete block was reserved by the first reservation.
  • the second reservation may be transmitted in response to the mobile station having data with a higher priority than the transmission for which the second discrete block was reserved by the first reservation, or with a latency budget that could not be met using a new reservation process.
  • This disclosure also provides a method of sidelink transmission between mobile stations in a cellular communications network, the method comprising the steps of transmitting a first reservation from a first mobile station, wherein the first reservation reserves a plurality of discrete blocks of transmission resources and indicates a destination mobile station for the discrete blocks; and transmitting data in a first of the discrete blocks, wherein the data or the first reservation includes an indication to the destination mobile station that the destination mobile station can utilise at least a subsequent one of the discrete blocks for a transmission from the destination mobile station.
  • the first reservation may be a sidelink control information messages.
  • the sidelink control information message may be a two-part sidelink control information message.
  • the destination address may be in the second part of the two-part sidelink control information message.
  • the destination mobile station may utilise the indicated discrete block to transmit a message to the first mobile station.
  • the method may further comprise the step of receiving a configuration message from a base station indicating whether it is permissible to change the destination for previously reserved discrete blocks of transmission resources.
  • the method may further comprise the step of receiving a configuration message from a base station indicating whether it is permissible to change the transmitter for previously reserved discrete blocks of transmission resources
  • the configuration may relate to one or more resource pools of transmission resources.
  • the priority of the transmission in the second of the discrete blocks may be the same or higher than the priority of the transmission for which the second discrete block was reserved by the first reservation.
  • the second reservation may be transmitted in response to the mobile station having data with a higher priority than the transmission for which the second discrete block was reserved by the first reservation, or with a latency budget that could not be met using a new reservation process.
  • the indication to the destination may indicate that the subsequent one of the discrete blocks is to be used for a response to the data in the first discrete block.
  • the methods may be performed after the first mobile station has performed a sensing operation to identify available transmission resources.
  • the methods may be performed after the first mobile station has received an indication of available transmission resources.
  • Figure 1 shows selected elements of a cellular wireless communication network
  • Figure 2 shows selected elements in a Radio Area Network of the cellular wireless communication network of Figure 1;
  • Figure 3 shows an example of reserving multiple resources
  • Figures 4 &5 show examples of re-allocating previously reserved transmission resources
  • Figure 6 shows an example of transmission being delay
  • Figure 7 shows an example of utilising the methods of Figures 4 &5;
  • Figure 8 shows an example of re-allocating the transmitter which uses reserved resources.
  • FIG. 1 shows a schematic diagram of three base stations 102 (for example, eNB or gNBs depending on the particular cellular standard and terminology) forming a cellular network.
  • each of the base stations 102 will be deployed by one cellular network operator to provide geographic coverage for UEs in the area.
  • the base stations form a Radio Area Network (RAN) .
  • RAN Radio Area Network
  • Each base station 102 provides wireless coverage for UEs in its area or cell.
  • the base stations 102 are interconnected via the X2 interface and are connected to a core network 104 via the S1 interface.
  • the interface and component names mentioned in relation to Figure 1 are used for example only and different systems, operating to the same principles, may use different nomenclature.
  • the base stations 102 each comprise hardware and software to implement the RAN’s functionality, including communications with the core network 104 and other base stations 102, carriage of control and data signals between the core network and UEs, and maintaining wireless communications with UEs associated with each base station.
  • the core network 104 comprises hardware and software to implement the network functionality, such as overall network management and control, and routing of calls and data.
  • V2V vehicle-to-vehicle
  • the UEs may be incorporated into vehicles such as cars, trucks and buses. These vehicular UEs are capable of communicating with each other in in-coverage mode, where a base station manages and allocates the resources and in out-of-coverage mode, without any base station managing and allocating the resources.
  • V2X vehicle-to-everything
  • the vehicles may be communicating not only with other vehicles, but also with infrastructure, pedestrians, cellular networks and potentially other surrounding devices.
  • V2X use cases include:
  • Vehicles Platooning this enables the vehicles to dynamically form a platoon travelling together. All the vehicles in the platoon obtain information from the leading vehicle to manage this platoon. This information allows the vehicles to drive closer than normal in a coordinated manner, going to the same direction and travelling together.
  • Extended Sensors this enables the exchange of raw or processed data gathered through local sensors or live video images among vehicles, road site units, devices of pedestrian and V2X application servers.
  • the vehicles can increase the perception of their environment beyond of what their own sensors can detect and have a more broad and holistic view of the local situation.
  • High data rate is one of the key characteristics.
  • Each vehicle and/or RSU shares its own perception data obtained from its local sensors with vehicles in proximity and that allows vehicles to synchronize and coordinate their trajectories or manoeuvres. Each vehicle shares its driving intention with vehicles in proximity too.
  • Remote Driving -this enables a remote driver or a V2X application to operate a remote vehicle for those passengers who cannot drive by themselves or remote vehicles located in dangerous environments. For a case where variation is limited and routes are predictable, such as public transportation, driving based on cloud computing can be used. High reliability and low latency are the main requirements.
  • FIG. 2 illustrates a base station 102 forming a RAN, and a sidelink transmitter (SL Tx UE) UE 150 and a sidelink receiver (SL Rx UE) UE 152 in the RAN.
  • UEs 150 and 152 are described as transmitter and receiver only for the purposes of explanation during a particular communication, and their roles may equally be reversed.
  • the base station 102 is arranged to wirelessly communicate over respective connections 154 with each of the SL Tx UE 150 and the SL Rx UE 152.
  • the SL Tx UE 150 and the SL Rx UE 152 are arranged to wirelessly communicate with each other over a sidelink 156.
  • TDD half duplex
  • a resource pool is a set of time-frequency resources from which resources for a transmission can be selected.
  • UEs can be configured with multiple transmit and receive resource pools.
  • Mode 1 Two modes of operation are used for resource allocation for sidelink communication depending on whether the UEs are within coverage of a cellular network.
  • the V2X communication is operating in-coverage of the base stations (eg eNBs or gNBs) . All the scheduling and the resource assignments may be made by the base stations by transmitting a Downlink Control Information (DCI) to the transmitter UE.
  • DCI Downlink Control Information
  • Mode 2 applies when the V2X services operate out-of-coverage of cellular base stations.
  • the UEs need to schedule themselves. For fair utilization, sensing-based resource allocation is generally adopted at the UEs.
  • UEs reserve resources for a transmission by transmitting a Sidelink Control Information (SCI) message indicating the resources to be used.
  • SCI Sidelink Control Information
  • the SCI notifies the recipient (which may be a single UE in unicast, a group of UEs in groupcast, or all reachable UEs in broadcast) of the details of the transmission it can expect.
  • Figure 3 shows a schematic diagram of a resource reservation process for sidelink transmissions.
  • the UE After performing a sensing operation in Mode 2, or being assigned resources in Mode 1, the UE identifies resources 30 which it wishes to utilise for transmissions, and transmits the first stage 31 of a first SCI in the first resources 30.
  • the first stage SCI 31 can also reserve up to two further blocks of resources 32, 33 for future transmissions.
  • the second stage 34 of the first SCI indicates the source ID (i.e. transmitter identity – “SRC” ) and destination ID (DST) for the payload 35to which the SCI relates, carried on a PSSCH transmission.
  • the subsequent reserved resources 32, 33 can span a window of up to 32 slots and are principally intended for retransmission of the transport block (TB) carried as payload 35.
  • FIG. 4 shows a system in which those resources can be used for transmission of data to a different destination UE.
  • the first transmission may be successfully decoded, and hence retransmission is not required.
  • the UE may decide to utilise them for transmission of a different TB to a different destination UE.
  • the transmitter UE transmits the first stage 41 of a first SCI in selected resources 40.
  • the first stage SCI 41 also reserves at least one subsequent block of transmission resources 42, 43 (in this example two blocks) .
  • the second stage 44 of the first SCI and PSSCH 43 are transmitted in the conventional manner using the first reserved resources 40.
  • the UE wishes to transmit a TB to a second destination UE, different to that originally intended. All relevant UEs in range of the first UE decode both first and second stages of SCI messages to determine whether the indicated transmission is for that UE.
  • the transmitting UE can thus update the destination address in the second stage 45 (which is carried on PSSCH) of the second SCI, indicating the intended destination for the TB/payload of the PSSCH 46. Effectively this is a new reservation, but of the same transmission resources with a new destination address.
  • the original destination was DST #1, but in SCI 45 is changed to DST #2.
  • the intended destination UE will decode this second stage 45 of the SCI and hence is made aware that it should receive and decode the PSSCH 46 referenced by the second SCI message.
  • the use of the second reserved resources is therefore modified compared to the original intended purpose.
  • the originally-intended recipient and any other UEs receiving the transmission) will ignore the PSSCH 46 as they are not indicated as the destination in the second stage 45 of the second SCI message.
  • the originally intended recipient will assume the originally scheduled (re) transmission did not occur.
  • the subsequent transmission in transmission resources 43 may proceed to the originally-intended recipient (DST #1) .
  • the transmitter may also modify the destination address in the second stage 50 of the third SCI to also direct the corresponding PSSCH transmission 51 to an alternative destination (in this case DST #2, the same as the destination for PSSCH 46) .
  • the second transmission 52 may include a reservation of resources, indicated to be for the second UE, which overlaps with the original reservation for the first UE. Upon receipt of that reservation the first UE may interpret this as cancellation of the original reservation.
  • the transmissions whose original details are altered can be any reserved resource, including resources reserved using both aperiodic and periodic reservation schemes.
  • Whether the resourcescan be reserved are for the same TB or possibly for other TB is configurable per resource pool, using the resource pool parameter reserveResourceDifferentTB.
  • a periodicity parameter in first-stage SCI Resource reservation period is added to enable the scheduling of periodic traffic, even if the TB is not in the queue yet, which is similar to a configured grant situation.
  • the priority of the actually transmitted PSSCH should be the same or higher than that of the original reservation. This avoids a high-priority reservation being used to transmit a low priority TB. If a low priority TB was transmitted on a high-priority reservation this would give unfair preference to the low priority data and may prevent other UEs pre-empting the low priority transmission because it looks like a higher priority.
  • a transmitter UE has reserved at least one future transmission resource for an intended destination. Prior to the transmission resources the transmitter UE receives new data with a higher priority, or tighter latency budget, which could not be met if a standard reservation process is followed or for which suitable resources are not available. Alternatively, even if transmission is possible the transmitter UE may decide to prioritise transmission of the new data.
  • the transmitter thus decides to utilise the previously reserved resources for this new data, rather than the originally intended data.
  • the transmitter UE thus prepares the TB from the new data.
  • the transmitter UE transmits a first-stage SCI with updated information as required (for example, priority, DMRS) , and a second-stage SCI with the transmitter UE’s source identity (which remains the same) , and the new destination with relevant TB-related fields (for example, HARQ ID, NDI, feedback configuration) .
  • the previously reserved resources are thus utilised for the new data which has been prioritised over the previously planned data.
  • the UE may then perform a resource reselection process to reserve new resources for the original data.
  • the new data is for the same destination UE as the original data. In this case the same process can be utilised, but the destination address remains the same.
  • the new content of the TB can be indicated to the destination UE by suitable HARQ ID and NDI settings in the second stage SCI for the new TB.
  • the same transmission resources are used for the new data, which assumes they can adapt to the size of the resource, for example using different MCS or puncturing. For example, if the new data is smaller the MCS can be reduced to improve the reliability, albeit with reduced resource efficiency. Similarly, if the data is too large the MCS can be increased, or a partial/punctured version of the data can be transmitted.
  • the resources may not be directly reused, but can be part of a larger resource selection.
  • resource selection a UE can indicate that previously reserved resources are available for use such that the resources can be used for a more urgent transmission (either by the same UE or another one) .
  • Another method to cope with urgent transmission yet applying some intra-user priority handling is to set the already reserved resource with a RSRP equivalent to the priority of the reserved transmission, so that a resource selection with a packet of stronger priority will consider that resource available.
  • a UE pre-empts its own transmission may be more attractive than pre-empting a different UE’s transmission as it leads to less unexpected interference with other UEs, and removes the need for signalling and procedures towards the pre-empted UE and its receiver.
  • a UE may be aware at the time of a reservation process that it has data for more than one destination UE and utilise the above techniques for a more efficient transmission process.
  • FIG. 6 The conventional approach is shown in Figure 6, in which a UE has data for two destinations (DST #1 and DST#2) .
  • the UE would usually make the initial transmission of the data for DST #1 at 60, and plan for transmission to DST #2 at 61, but not reserve those resources.
  • a further transmitter makes a transmission at 62 and reserves resources at 61 thus preventing the first UE from transmitting and delaying the initial transmission to DST #2.
  • the UE performs an initial transmission to DST #1 at 70 as with Figure 6 but included in that transmission is a reservation of resources at 71.
  • This reservation initially has the destination set to DST #1, but the UE intends to use those for DST #2.
  • the second UE makes a transmission but is aware of the reservation at 71 and hence does not claim those resources but reserves later resources at 73.
  • the transmission to DST #2 is thus not affected, and the UE proceeds by update the destination address (and any other details) to reflect the new destination
  • This approach enables a single resource reservation procedure to reserve resources for multiple transmissions, thus reducing control processing and signalling. This approach may also reduce latency for the subsequent transmission as delays caused by conflicts are avoided, and there is also no need to wait for the subsequent reservation processes to complete before being able to transmit.
  • Figure 7 may be most attractive where the data for each destination has a similar size such that a common resource size is a good fit for each of them, with adjustments made by changing the MCS. If the data for each destination has a different priority the sensing and reservation process should be performed using the lowest priority, or make the lowest priority first, so that other UEs do not overestimate the priority of the data to be transmitted on the reserved (and changed) resources.
  • a UE may reserve future transmission resources for retransmissions of a particular TB transmitted using HARQ feedback. If the TB is successfully decoded prior to all retransmissions being made the UE has additional reserved resources that are not required. In such a situation any reserved resources after reception of a success indication (for example ACK or no-NACK depending on the feedback mode) may be re-used by the UE for other TBs to the same destination (indicated by suitable setting of the HARQ process ID and NDI indicator) , or to a different UE by updating the destination address.
  • a success indication for example ACK or no-NACK depending on the feedback mode
  • subsequent transmission resources of a multiple reservation are used by a different transmitting UE. That is, the source address in the subsequent second stage SCI is updated and the transmission made by that other UE.
  • the subsequent resources may be utilised by the destination of the first transmission in order to transmit a response such that the source and destination swap roles.
  • the technique may also be used to enable one UE to schedule resources for another, or for L1-relaying.
  • Figure 8 shows an example of a transmitter UE reserving resources for use by the recipient of the first transmission.
  • UE #0 performs the normal sensing procedure and transmits the first stage 80 of a first SCI to reserve two blocks of transmission resources.
  • the Second stage 81 of the first SCI refers to the TB part of PSSCH 82 and includes the source address (UE #0) and the destination address (UE #1) .
  • the PSSCH 82 includes the TB for UE #1, and also scheduling information 83 (which could be part of the second stage SCI transmitted on the PSSCH) giving UE #1 details of resources that can be used by UE #1 for further transmission (i.e. the subsequent resources reserved by SCI 80) .
  • UE #1 can extract the scheduling information and prepare a transmission on the indicated resources.
  • the UE #1 transmits a first stage SCI 84 and a second stage SCI 85 including the source address (UE #1) and destination address (UE #2) .
  • the PSSCH 85 thus carries the TB for delivery to UE #2.
  • UE #2 may be the same as UE #0, or may be a different UE.
  • An example use-case of this system is to enable transmission of data from UE #0 to UE #2, where a direct link is not possible, but UE #1 can act as a relay.
  • the reserved resources can be used to send that without the delay of a sensing process (i.e. UE #2 is UE #0) .
  • UE #1 is thus able to transmit its data on resources reserved originally by UE #0.
  • UE #0 will not attempt to use those resources as it has explicitly indicated them to be available for UE #1. It is possible that a further UE could pre-empt the resources UE #1 is going to use.
  • UE #1 detects a pre-emption it can check the RSRP and decide whether to use the resources or not. If UE #1 decides not to transmit it can trigger a reselection process directly, or indicate to UE #0 the failure and need for new resources. Requesting resources via UE #0 incurs greater signalling overhead and latency, but may be necessary if UE #1 is not allowed or is incapable of reselecting resources for the TB that is to be transmitted. If UE #0 detects the pre-emption, and is responsible for resource allocation rather than UE #1, UE #0 will trigger a resource resection and will perform a new (re) transmission.
  • the scheduling information for the re-allocated transmission resources is carried in the PSSCH payload, but other mechanisms may be used to provide this indication to UE #1.
  • An advantage of using the PSSCH is that only the intended destination (and also the UE intended to use the resources) decodes the PSSCH and hence can identify the available resources.
  • the precise format and location of the scheduling information can be defined in the (pre-) configuration, for example in the resource pool configuration.
  • the information used by UE #1 to generate and schedule its message can be derived from UE #0’s first stage SCI and the scheduling information, which will include the resource indications, priority, and optionally the UE #2 ID (unless that is to be selected by UE #1) .
  • UE #0 may also provide additional information, for example the reasons for allocating the resources (e.g. details of specific content to be sent –for example measurement reports, feedback, sensing reports, or resource indications) .
  • the UE #1 will need to receive the scheduling information with sufficient time-gap prior to the transmission time to be able to prepare the messages for transmission, which may present limitations on the ability to re-allocate resources if they are closely spaced in time.
  • the 3GPP NR DCI 3_0 format (or 3_1 if NR schedules LTE sidelink) that is meant for a gNB to schedule a user sidelink transmission can be reused to provide the scheduling information to UE #1.
  • the resource for transmission indicated matches the reserved resource and that way the original destination knowns it was reserved for it.
  • a new control indicator, a reduced version of DCI 3_0, that can also be designed based on DCI 3_0 but removing fields such a HARQ process ID, NDI, PFSCH-to-HARQ timing, PUCCH indicator and configurationindex could be utilised.
  • UE #1 Prior to using the resources re-allocated by UE #0, UE #1 should check an validate that the reserved resources are still available for transmission (for example in case they have been pre-empted by a different UE) .
  • resource re-allocation is to enable a fast reply from the initial destination UE to the source UE. That is, the source and destination swap roles for the subsequent transmission resources reserved by the initial transmitter.
  • ⁇ Measurement e.g. CSI report: when measurement reports are required quickly, the transmitter can reserve a resource for a PSSCH-based report to be sent back instead of waiting for the initial receiver to sense and select resources for the response.
  • Sensing/scheduling reports the receiver UE will report the results of its sensing procedure (i.e. the available resources) or a specific resource indication. This can be used in the case where an intended receiver suggests an alternative resource to the source (instead of a currently reserved resource) in the case of sensed pre-emption, interference or scheduling conflict.
  • ⁇ HARQ feedback if the next available PSFCH is too far in the future to meet the HARQ latency budget of a transmission.
  • the HARQ feedback will be sent using PSSCH data payload instead of the regular PSFCH. This case can happen if the periodicity of PSFCH is long, and since it is logical slot, the actual delay can be extended when the bandwidth is shared with UL/DL. Plus, the PSFCH may be subject to duplexing conflicts that will cancel the transmission of PSFCH.
  • response message can be multiplexed/combined with other data if any is available to fully use the resources reserved.
  • an indication of this may be provided in the SCI, rather than embedding scheduling data in the PSSCH. This may allow more efficient control signalling, and fast and better decoding due to the differences between SCI and PSSCH coding. A single bit flag can be utilised thus avoiding significant expansion of the SCI.
  • the capability to change the destination or source of a reserved resource may thus be configured in (pre-) configuration per resource pool.
  • the configuration can be done with specific bit-flags for different authorizations. For example:
  • bit-flag to enable/disable changing both source and destination of a reserved resource, limited to the case of switching source and destination.
  • flags are given as examples only any the functionalities and specific attributes can be changed as required to provide efficient signalling.
  • the additional flags or scheduling information corresponding to these features are (pre-) configured to be part of the signalling (e.g. format of second-stage SCI) or format of the scheduling information multiplexed with data.
  • the network may select to enable or disable the discussed features dependent on relevant aspects of network performance, for example the number of users in the network, channel occupancy, compared to a threshold.
  • a transmitter UE may receive a DCI where the resources are at least partly overlapping already reserved resources by that same transmitter UE and the UE utilises the new resources for transmission.
  • the techniques described herein may be applicable to all types of sidelink transmission, and in particular to unicast, groupcast and broadcast transmissions.
  • any of the devices or apparatus that form part of the network may include at least a processor, a storage unit and a communications interface, wherein the processor unit, storage unit, and communications interface are configured to perform the method of any aspect of the present invention. Further options and choices are described below.
  • the signal processing functionality of the embodiments of the invention especially the gNB and the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface, such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product ‘computer-readable medium’a nd the like may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally 45 referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module (in this example, software instructions or executable computer program code) , when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • an embodiment of the invention 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.
  • the present invention has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the accompanying claims. Additionally, although a feature may appear to be described in connection with particular embodiments, one skilled in the art would recognise that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term ‘comprising’ does not exclude the presence of other elements or steps.

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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 des procédés de réservation et de réattribution de ressources de transmission pour des transmissions de liaison latérale. Une pluralité de ressources de transmission peut être réservée par une première réservation pour des transmissions d'une première station mobile à une deuxième station mobile. L'une de ces transmissions peut être réattribuée pour des transmissions par la première station à une troisième station mobile, ou pour une utilisation pour des transmissions par une troisième station mobile.
PCT/CN2021/075630 2020-02-07 2021-02-05 Réservation de ressources pour transmissions de liaison latérale WO2021155849A1 (fr)

Applications Claiming Priority (2)

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US202062971842P 2020-02-07 2020-02-07
US62/971,842 2020-02-07

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Citations (4)

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Publication number Priority date Publication date Assignee Title
US20190191461A1 (en) * 2016-09-10 2019-06-20 Lg Electronics Inc. Method for reserving finite number of resources used for performing v2x communication in wireless communication system, and terminal using same
CN110351687A (zh) * 2019-07-02 2019-10-18 北京邮电大学 V2v资源调配方法和装置
CN110741710A (zh) * 2017-08-10 2020-01-31 Oppo广东移动通信有限公司 设备对设备通信的方法和终端设备
CN111294102A (zh) * 2019-08-02 2020-06-16 展讯半导体(南京)有限公司 Csi-rs发送方法及装置、存储介质、发送ue

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190191461A1 (en) * 2016-09-10 2019-06-20 Lg Electronics Inc. Method for reserving finite number of resources used for performing v2x communication in wireless communication system, and terminal using same
CN110741710A (zh) * 2017-08-10 2020-01-31 Oppo广东移动通信有限公司 设备对设备通信的方法和终端设备
CN110351687A (zh) * 2019-07-02 2019-10-18 北京邮电大学 V2v资源调配方法和装置
CN111294102A (zh) * 2019-08-02 2020-06-16 展讯半导体(南京)有限公司 Csi-rs发送方法及装置、存储介质、发送ue

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