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WO2022082787A1 - Communication sur liaison latérale - Google Patents

Communication sur liaison latérale Download PDF

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Publication number
WO2022082787A1
WO2022082787A1 PCT/CN2020/123432 CN2020123432W WO2022082787A1 WO 2022082787 A1 WO2022082787 A1 WO 2022082787A1 CN 2020123432 W CN2020123432 W CN 2020123432W WO 2022082787 A1 WO2022082787 A1 WO 2022082787A1
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WIPO (PCT)
Prior art keywords
sidelink
packets
aperiodic
periodic
sensing
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.)
Ceased
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PCT/CN2020/123432
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English (en)
Inventor
Dong Li
Yong Liu
Torsten WILDSCHEK
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.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
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.)
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Application filed by Nokia Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2020/123432 priority Critical patent/WO2022082787A1/fr
Priority to CN202080026469.6A priority patent/CN114667778B/zh
Publication of WO2022082787A1 publication Critical patent/WO2022082787A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present disclosure relate to sidelink communication.
  • sidelink communication Device to device communication between terminals of a cellular telecommunications network can be described as sidelink communication. Specific channels and protocols are defined to enable the transmission of sidelink packets directly from one terminal device to another terminal device.
  • sidelink (SL) communication is also described as communication via the Proximity-based Communication (Interface) 5, the PC5 interface.
  • the time-frequency resources where control and data can be transmitted are called resource pools.
  • a terminal device can autonomously select resources for transmission from the resource pool. In 3GPP, this occurs in Mode 4 in Long Term Evolution (LTE) SL and in Mode 2 in New Radio (NR) SL.
  • LTE Long Term Evolution
  • NR New Radio
  • a terminal device can for example, continuously perform sensing in a sensing window and then make a resource selection in an associated selection window based on the sensing results.
  • LTE Long Term Evolution
  • a partial sensing mechanism for periodic traffic can be used to achieve a tradeoff between collision avoidance and power consumption reduction.
  • an apparatus comprising means for:
  • selecting a sensing pattern for periodic sidelink packets and/or a sensing pattern for aperiodic sidelink packets based, at least, on the determined occupation of the sidelink communication resource pool by at least aperiodic sidelink packets; and selecting resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns.
  • a triggering time determines a sensing window before the triggering time and a resource selection window after the triggering time, wherein the selected sensing pattern for periodic sidelink packets and/or the sensing pattern for aperiodic sidelink packets is used within the sensing window and is a partial pattern compared to the sensing window, and wherein the transmission of the one or more sidelink packets occurs within the resource selection window.
  • the sensing pattern for periodic sidelink packets is dependent upon supported periodicities of the periodic sidelink packets and a sensing pattern for aperiodic sidelink packets is dependent upon resource reservation intervals for retransmission (s) of aperiodic packets.
  • the sensing pattern for periodic sidelink packets comprises logically discontinuous sidelink slots and the sensing pattern for aperiodic sidelink packets comprises logically continuous sidelink slots, both in a relevant sidelink resource pool.
  • the apparatus comprises means for determining occupation of the sidelink communication resource pool by periodic sidelink packets, wherein the selection, within a single sensing window, of a sensing pattern for periodic sidelink packets and/or a sensing pattern for aperiodic sidelink packets is based, at least, on the determined occupation of the sidelink communication resource pool by at least periodic sidelink packets.
  • the apparatus comprises means for determining occupation of the sidelink communication resource pool by measuring a proportion of periodic sidelink packets and a proportion of aperiodic sidelink packets.
  • the selection is based, at least, on a comparison of occupation of the sidelink communication resource pool by periodic sidelink packets and by aperiodic sidelink packets.
  • the selection is based, at least, on whether occupation by at least aperiodic sidelink packets exceeds an aperiodic threshold and/or on whether occupation by at least periodic sidelink packets exceeds a periodic threshold.
  • the periodic threshold and/or the aperiodic threshold is defined by a network and communicated to the apparatus or is defined by the apparatus.
  • the apparatus comprises means for:
  • a sensing pattern for periodic sidelink packets when a determined occupation of the sidelink communication resource pool by periodic sidelink packets is greater than a determined occupation of the sidelink communication resource pool by aperiodic sidelink packets;
  • a sensing pattern for aperiodic sidelink packets when a determined occupation of the sidelink communication resource pool by aperiodic sidelink packets is greater than a determined occupation of the sidelink communication resource pool by periodic sidelink packets.
  • the apparatus comprises means for:
  • a sensing pattern for periodic sidelink packets if a determined occupation of the sidelink communication resource pool by periodic sidelink packets is greater than a periodic threshold
  • a sensing pattern for aperiodic sidelink packets if a determined occupation of the sidelink communication resource pool by aperiodic sidelink packets is greater than an aperiodic threshold.
  • the apparatus comprises means for asymmetric selection of resources for transmission of one or more sidelink packets in dependence upon whether the one or more sidelink packets for transmission are periodic or aperiodic.
  • selection of resources for transmission of one or more sidelink packets uses a periodic selection condition if the one or more sidelink packets for transmission are periodic and uses an aperiodic selection condition if the one or more sidelink packets for transmission are aperiodic, wherein a reserved resource is more likely to be excluded to avoid persistent collisions between periodic sidelink packets.
  • selection of resources for transmission of one or more sidelink packets uses a periodic selection condition if the one or more sidelink packets for transmission are periodic and uses an aperiodic selection condition if the one or more sidelink packets for transmission are aperiodic, wherein the periodic selection condition is a lower threshold, when there is a likelihood of persistent periodic collisions between periodic sidelink packets, than the aperiodic selection condition.
  • the apparatus comprises means for determining whether or not to perform further sensing for aperiodic sidelink packets before using the selected resources for transmission of a sidelink packet; and performing resource re-selection for transmission of the sidelink packet based on the results of the further sensing.
  • the apparatus is configured as a user equipment.
  • selecting a sensing pattern for periodic sidelink packets and/or a sensing pattern for aperiodic sidelink packets based, at least, on the determined occupation of the sidelink communication resource pool by at least aperiodic sidelink packets; and selecting resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns.
  • selecting a sensing pattern for periodic sidelink packets and/or a sensing pattern for aperiodic sidelink packets based, at least, on the determined occupation of the sidelink communication resource pool by at least aperiodic sidelink packets; and selecting resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns.
  • an apparatus comprising means for:
  • an apparatus comprising means for:
  • NR New radio also known as 5G
  • TX transmission transmitter, transmitting (depending on context)
  • V2P vehicle to pedestrian communication
  • FIG. 1 shows an example of the subject matter described herein
  • FIG. 2A, 2B, 2C show another example of the subject matter described herein;
  • FIG. 3 shows another example of the subject matter described herein
  • FIG. 4 shows another example of the subject matter described herein
  • FIG. 5 shows another example of the subject matter described herein
  • FIG. 6 shows another example of the subject matter described herein
  • FIG. 7 shows another example of the subject matter described herein
  • FIG. 8 shows another example of the subject matter described herein
  • FIG. 9 shows another example of the subject matter described herein.
  • FIG. 10 shows another example of the subject matter described herein
  • FIG. 11 shows another example of the subject matter described herein.
  • Fig 1 illustrates an example of a method 100 comprising:
  • selecting a sensing pattern for periodic sidelink packets and/or a sensing pattern for aperiodic sidelink packets based, at least, on the determined resource occupation by at least aperiodic sidelink packets
  • the resource occupation is an occupation of a sidelink communication resource pool by the periodic packets or aperiodic packets. Also, sensing using the sensing pattern (s) occurs within a sub-set of the sidelink communication resource pool. Also, the resources selected for transmission are within the sidelink communication resource pool.
  • the method 100 may enable autonomous resource selection, for sidelink packet transmission, by a terminal device.
  • the method may also comprise sensing, within a configured resource pool, using the selected sensing pattern or patterns. There is coexistence of periodic and aperiodic sidelink packets in same resource pool.
  • the sensing determines which resources of the resource pool are available because they are not in use by other terminal devices or not in use by other terminal devices with higher-priority traffic.
  • Selecting resources for transmission comprises selecting resources for transmission from the available resources. Having selected such resources, the terminal device may, in at least some examples, transmit and re-transmit in them a certain number of times, or until a cause of resource reselection is triggered.
  • the use of a sensing pattern that is optimized for a current utilization of the resource pool, shared by periodic and aperiodic sidelink packets, may reduce power consumption of the sensing devices.
  • the sensing pattern 20 for periodic sidelink packets is a pattern for partial sensing and the sensing pattern 22 for aperiodic sidelink packets is a pattern for partial sensing.
  • Partial sensing is sensing where some but not all of the available time for sensing is used. For example, some but not all of the available time slots in a sensing window 12 that may be used for sensing are used for sensing
  • the sensing patterns 20, 22 are patterns within the same sensing window 12 and are partial patterns compared to the sensing window 12.
  • the sensing pattern 20 for periodic sidelink packets occupies a part (not the whole) of the sensing window 12.
  • the sensing pattern 22 for aperiodic sidelink packets occupies a part (not the whole) of the sensing window 12.
  • a resource selection triggering time 10 is defined when there is a packet for transmission at a transmission buffer.
  • the triggering time 10 determines the sensing window 12 before the triggering time and a resource selection window 14 after the triggering time.
  • the selected sensing pattern (s) (e.g. the sensing pattern 20 for periodic sidelink packets and/or the sensing pattern 22 for aperiodic sidelink packets) is used within the sensing window 12.
  • the transmission of the one or more sidelink packets occurs within the resource selection window 14.
  • the partial sensing pattern 20 consists of single or multiple non-contiguous sidelink slots which corresponds to the configured supported periods in the resource pool.
  • the sensing pattern 20 for periodic sidelink packets is a sensing pattern that is dependent upon supported periodicities of the periodic sidelink packets in the resource pool.
  • the sensing pattern 20 for periodic sidelink packets comprises logically discontinuous sidelink slots.
  • Logical slots are a sub-set of physical slots that are configured as sidelink resources available for sensing and sidelink transmissions.
  • the sensing pattern 20 for periodic sidelink packets may be defined at least by a bitmap signaling.
  • the sensing pattern 22 for aperiodic sidelink packets comprises multiple logically continuous sidelink slots.
  • Logical slots are a sub-set of physical slots that are configured as sidelink resources available for sensing and sidelink transmissions.
  • the sensing pattern 22 for aperiodic sidelink packets is a sensing pattern dependent upon resource reservation intervals for retransmission (s) of the aperiodic packets.
  • the sensing pattern 20 for periodic sidelink packets and the sensing pattern 22 for aperiodic sidelink packets share the same sidelink resource pool and sensing window 12.
  • One or two partial sensing patterns 20, 22 from the same sensing window 12 can be used.
  • the methods described can provide sidelink (SL) enhancement in 5G NR.
  • SL sidelink
  • resource allocation enhancements to reduce power consumption of the user equipments (UEs) in sidelink operations e.g. pedestrian UEs or public safety UEs involved in sidelink transmissions.
  • UEs user equipments
  • Sidelink transmissions are confined to a configured resource pool (RP) .
  • the allowed resource reservation periods are defined (by ‘sl-ResourceReservePeriodList-r16’ in NR SL and ‘SL- RestrictResourceReservationPeriodList’ in LTE SL) .
  • PSCCH and PSSCH resources for sidelink control and sidelink data channels respectively are defined within resource pools for the sidelink transmissions.
  • a UE will make its resource selections based on sensing within the pool. The sensing, resource selection, and sidelink transmission operations are confined within the sidelink resource pool.
  • a resource pool can, for example, be divided into sub-channels in the frequency domain, which may be consecutively non-overlapping sets of ⁇ 10 PRBs in a slot, the size depending on (pre-) configuration. Resource allocation, sensing, and resource selection are performed in units of a sub-channel.
  • Resource pools are (pre-) configured to a UE separately from the transmission perspective (TX pools) and the reception perspective (RX pools) . This allows a UE to monitor PSCCH, and hence receive PSSCH transmissions, in resource pools other than those in which it transmits, so that it may attempt to receive transmissions made by other UEs in those RX pools.
  • the terminal device determines occupation of the sidelink communication resource pool (resource occupation) by sidelink packets.
  • a periodic sidelink packet may reserve resources for the next periodic transmission.
  • An aperiodic packet may reserve resources for subsequent retransmissions of the same data.
  • the current transmission may reserve resources for the next one or two retransmissions over up to 32 contiguous logical SL slots.
  • the contiguous multiple (e.g. up to 32 logical SL slots) slots before the resource selection triggering time may act as the partial sensing pattern 22.
  • the resource reservation in a sidelink packet is indicated by sidelink control information (SCI) which is carried by PSCCH.
  • SCI sidelink control information
  • a terminal device may therefore decode the PSCCH to become aware of what resources in what slots are reserved by different terminal devices.
  • the terminal device may therefore select resources for transmission with knowledge of reserved resources.
  • a resource selection window 14 is defined after slot n, i.e. [n+T1, n+T2] from which the resource is selected for the UE’s transmission.
  • a sensing window 12 is defined before slot n, i.e. over which channel sensing is performed (e.g. T 0 could be about one second) .
  • T 0 is a higher layer parameter and is a predefined parameter.
  • the sensing window 12 is divided into 10 sub-intervals and a sensing UE only senses the channel within some specific sub-intervals depending on configuration. Which sub-intervals will be sensed or not sensed is determined by the selected sensing pattern (s) 20.
  • the terminal device selects a sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic sidelink packets based on the determined resource occupation by sidelink packets.
  • a resource selection When a resource selection is triggered (e.g. by traffic arrival or a re-selection trigger) , the UE considers a sensing window12which starts a (pre-) configured time in the past and finishes shortly before the trigger time.
  • a sensing UE makes a received signal measurement, e.g. SL-RSRP, in the slots of the sensing window 12defined by the selected sensing pattern (s) . This measurement implies a level of interference which would be caused and experienced if the sensing UE were to transmit in those slots.
  • sensing pattern selection is described below with reference to FIG 3, 4 and 5.
  • the terminal device selects resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns 20, 22.
  • the terminal device selects resources for its (re-) transmission (s) from within the resource selection window.
  • the window starts shortly after the trigger for (re- ) selection of resources, and cannot be longer than the remaining latency budget of the packet due to be transmitted.
  • Reserved resources in the selection window 14 with a measured received signal parameter, e.g. SL-RSRP, above a threshold may be excluded from being candidates by the sensing terminal device.
  • the threshold can be set according to the priorities of the traffic of the sensing and transmitting UEs. Thus, a higher priority transmission from a sensing UE may occupy resources which are reserved by a transmitting UE with sufficiently low received signal parameter e.g. SL-RSRP and sufficiently lower-priority traffic.
  • a sensing terminal device Shortly before transmitting in a reserved resource, a sensing terminal device re-evaluates the set of resources from which it may select, to check whether its intended transmission is still suitable, for example, taking account of late-arriving SCIs due, typically, to an aperiodic higher-priority service starting to transmit after the end of the original sensing window.
  • the method 100 can enable autonomous resource selection, for sidelink packet transmission, by a terminal device.
  • the method 100 comprises:
  • a sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic packets based on the determined resource occupation by aperiodic sidelink packets and resource occupation by periodic sidelink packets;
  • the partial sensing procedure is conditional on determining resource occupation by periodic packets and conditional on determining resource occupation by aperiodic packets.
  • the method 100 can also comprise, at block 104, sensing within the single sensing window 12 using the selected sensing pattern (s) 20.
  • FIG 4 illustrates in more detail, an example of a method that may be performed at block 104.
  • the method at block 104 comprises selecting, for use within a single sensing window 12, a sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic packets based on the determined resource occupation by aperiodic sidelink packets and resource occupation by periodic sidelink packets.
  • the selection is based on a comparison of resource occupation by periodic sidelink packets and by aperiodic sidelink packets.
  • the selection is based, at least, on whether occupation by at least aperiodic sidelink packets exceeds a periodic threshold T p and/or on whether occupation by at least aperiodic sidelink packets exceeds an aperiodic threshold T ap .
  • the periodic threshold T p and/or the aperiodic threshold T p can be defined by a network and communicated to the terminal device or can be defined by the terminal device.
  • the thresholds can be congestion dependent.
  • the threshold parameters T p and T ap may be preconfigured or configured by a network node e.g. in the sidelink resource pool configuration signaling that is configured to potentially use partial sensing for power efficient UE autonomous resource selection.
  • the network node may take into account two aspects in determining the threshold values:
  • the network node can configure that at most one partial sensing pattern 20, 22 is used.
  • the method 104 determines whether resource occupation by periodic sidelink packets is above a periodic threshold T p .
  • the method 104 selects a sensing pattern 20 for periodic sidelink packets.
  • the method 104 determines whether resource occupation by aperiodic sidelink packets is above the aperiodic threshold T ap .
  • the method 104 selects a sensing pattern 22 for aperiodic sidelink packets.
  • the support of at most two sensing patterns 20, 22, or only one of the two sensing patterns for use in the same sensing window 12 may be preconfigured or configured by the network or determined by the terminal device.
  • the periodic sensing pattern 20 is selected and/or the aperiodic sensing pattern 22 is selected.
  • contention resolution 130 is used when it has been determined that resource occupation by periodic sidelink packets is above the periodic threshold T p and it has been determined that resource occupation by aperiodic sidelink packets is above the aperiodic threshold T ap .
  • the contention resolution process 130 can, for example, select for use as the one sensing pattern, a sensing pattern 20 for periodic sidelink packets, when the determined resource occupation by periodic sidelink packets is greater than the determined resource occupation by aperiodic sidelink packets and select for use as the one sensing pattern, a sensing pattern 22 for aperiodic sidelink packets, when the determined resource occupation by aperiodic sidelink packets is greater than the determined resource occupation by periodic sidelink packets.
  • the one sensing pattern from a group comprising: a sensing pattern 20 for periodic sidelink packets, if a determined resource occupation by periodic sidelink packets is greater than a periodic threshold; and a sensing pattern 22 for aperiodic sidelink packets, if a determined resource occupation by aperiodic sidelink packets is greater than an aperiodic threshold.
  • the periodic threshold used for contention resolution in favor of the periodic sensing pattern 20 is dependent upon resource occupation by aperiodic sidelink packets.
  • the aperiodic threshold used for contention resolution in favor of the aperiodic sensing pattern 20 is dependent upon resource occupation by periodic sidelink packets.
  • a different selection procedure can be used. For example, random selection or default selection of one of the sensing pattern 20 for aperiodic sidelink packets and the sensing pattern 22 for aperiodic sidelink packets.
  • a default procedure 132 can be performed. For example, random selection of a sensing pattern.
  • FIG 5 illustrates in more detail, an example of a method that can be performed at block 104.
  • the method comprises selecting, for use within a single sensing window 12, a sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic packets based on the determined resource occupation by aperiodic sidelink packets and resource occupation by periodic sidelink packets.
  • the resource occupation by periodic sidelink packets is measured as a proportion r p .
  • the proportion r p represents the ratio of resources occupied by the sensed periodic packets over the resources occupied by all the sensed packets in the resource pool (or over the total resources in the resource pool)
  • the resource occupation by aperiodic sidelink packets is measured as a proportion r ap .
  • the proportion r ap represents the ratio of resources occupied by the sensed aperiodic packets over the resources occupied by all the sensed packets in the resource pool (or over the total resources in the resource pool)
  • the determining of resource occupation can be performed, for example, by measuring a proportion of periodic sidelink packets and a proportion of aperiodic sidelink packets.
  • the periodic threshold T p is “thres1” and the aperiodic threshold T ap is “thres2” .
  • the partial sensing pattern 20 for periodic sidelink packets is “partial sensing duration-1” and the partial sensing pattern 20 for aperiodic sidelink packets is “partial sensing duration-2” .
  • the partial sensing pattern selection is based on channel occupation proportion for periodic/aperiodic packets
  • the partial sensing duration-1 is used in the sensing procedure if the measured r p is equal to or larger than a first threshold (thres1) and the partial sensing duration-2 is used in the sensing procedure if the measured r ap is equal to or larger than a second threshold (thres2) .
  • thres1 and thres2 could be the same or different. They may be preconfigured or configured by high layers or determined by UE implementations.
  • FIG 6 illustrates an example of block 106 and comprises selecting resources for transmission of one or more sidelink packets based on results of sensing using the selected sensing pattern or patterns 20, 22.
  • the selection is asymmetric.
  • the asymmetry is dependent upon whether the one or more sidelink packets for transmission are periodic or aperiodic.
  • the selection of resources for transmission of the one or more sidelink packets uses a periodic selection condition.
  • the selection of resources for transmission of the one or more sidelink packets uses an aperiodic selection condition.
  • the asymmetry can result in a reserved resource being more likely to be excluded from selection for transmission of the one or more sidelink packets to avoid persistent collisions between periodic sidelink packets.
  • the periodic selection condition is a lower threshold, when there is a likelihood of persistent periodic collisions between periodic sidelink packets, than the aperiodic selection condition. This results in a reserved resource being more likely to be excluded from selection for transmission of the one or more sidelink packets to avoid persistent collisions between periodic sidelink packets.
  • FIG 7 is an example of FIG 6.
  • the method checks whether it is reserved (by another terminal device) in the partial sensing procedure.
  • the method branches at block 162, to block 164 where the candidate resource is not excluded from a candidate resource set.
  • the method branches at block 162, to block 166 where a selection condition is determined. It is determined whether or not a measured level (e.g. SL-RSRP) is higher than a threshold.
  • a measured level e.g. SL-RSRP
  • the candidate resource is excluded from the candidate resource set at block 168.
  • the threshold used at block 166 for the selection condition is a variable threshold.
  • the offset is set to a configured (negative) value if all of the following conditions are satisfied, otherwise it is zero:
  • the resource is reserved by a (sensed) terminal device in the sensing pattern 20 for periodic sidelink packets (partial sensing duration-1)
  • the sensed terminal device transmits periodic sidelink packets (e.g. there is resource reservation for next period in the sidelink control channel) ;
  • the sensing terminal device is performing partial sensing to transmit periodic sidelink packets with a sidelink resource selected from the candidate resource set.
  • the combinations of conditions i) , ii) , iii) means that the candidate resource, if used, is likely to be subject persistent collisions between periodic sidelink packets. It is therefore excluded.
  • the method is performed irrespective of the whether periodic/aperiodic partial sensing has been performed.
  • Selection of resources for transmission of one or more sidelink packets is a selection made from the candidate resource set (minus the excluded candidates) .
  • the third threshold thres3 can be dependent on a priority level of the sensed packet compared to the sidelink packet for transmission.
  • a re-selection process is enabled at block 70.
  • re-selection processes include re-evaluation and pre-emption.
  • the terminal device Immediately before use of the selected resource, the terminal device enables a re-selection process that checks whether the selected resource is collided by other terminal devices.
  • a sensing UE re-evaluates the set of candidate resources from which it can select, to check whether its intended selected resource for transmission is still suitable. This can, for example, take account of late-arriving SCIs due, typically, to an aperiodic higher-priority service starting to transmit after the end of the original sensing window 12.
  • aperiodic sidelink packets e.g. r ap
  • T ap aperiodic threshold
  • the method branches to block 74 and the re-selection process is not performed.
  • the previously selected resource is used for transmission.
  • the method branches to block 76 where a new, additional partial sensing is performed for aperiodic sidelink packets using the sensing pattern 22 for aperiodic sidelink packets.
  • the method therefore performs further partial sensing for aperiodic sidelink packets before using the selected resources for transmission of a sidelink packet.
  • the sensing pattern 22 for aperiodic sidelink packets is used to evaluate the selected resource.
  • the method comprises resource re-selection for transmission of the sidelink packet based on the results of the further partial sensing.
  • the sensing terminal device will check whether the pre-selected resource is still in the candidate resource set and if not, the sensing terminal may re-select a new resource for its sidelink transmission from the candidate resource set.
  • i) determined as the ratio of the occupied resources by the sensed packets over the total number of resources in the resource pool.
  • r p and r ap are equal to one. Therefore, the sum of r p may be determined from r ap and vice versa.
  • the sensing UE senses in slot t x SL -5*P step that there is some SL transmission which reserves resources in slot t x SL (which also shows that the sensed UE is transmitting periodic packets)
  • the measured SL-RSRP e.g. from the sensed PSCCH or PSSCH
  • the associated threshold i.e. thres3 in FIG 7
  • the sensing UE is to transmit periodic packets with periodicity of 10*P step .
  • a negative value -3dB is set to the offset value, then according to the resource reserved by the sensed UE shall be excluded from the candidate resource set. Note that the purpose of this operation is to avoid the persistent collisions between the periodic packets of the sensed UE and the periodic packets of the sensing UE.
  • the sensing UE is to transmit an aperiodic packet
  • the offset value is set to 0 according to FIG 7, thus the resource reserved by the sensed UE is not excluded from the candidate resource set and thus it may be selected by the sensing UE for its sidelink transmission.
  • both the partial sensing duration-1 (sensing pattern 20) and partial sensing duration-2 (sensing pattern 22) are applied.
  • the sensing UE selects a resource in the slot m.
  • the sensing UE may choose to make re-evaluation to see whether the pre-selected resource in slot m is collided by other UEs.
  • the partial sensing duration-2 (sensing pattern 22) relative to the new resource selection triggering time is used as described in FIG 8.
  • the sensing UE will check whether the pre-selected resource is still in the new candidate resource set and if not, the UE may re-select a resource for its sidelink transmission.
  • FIG 9 illustrates an example of a network 100 comprising a plurality of network nodes including terminal nodes 110, access nodes 120 and one or more core nodes 129.
  • the terminal nodes 110 and access nodes 120 communicate with each other.
  • the one or more core nodes 129 communicate with the access nodes 120.
  • the network 100 is in this example a radio telecommunications network, in which at least some of the terminal nodes 110 and access nodes 120 communicate with each other using transmission/reception of radio waves.
  • the one or more core nodes 129 may, in some examples, communicate with each other.
  • the one or more access nodes 120 may, in some examples, communicate with each other.
  • the network 100 may be a cellular network comprising a plurality of cells 122 each served by an access node 120.
  • the interface between the terminal nodes 110 and an access node 120 defining a cell 122 is a wireless interface 124.
  • the access node 120 is a cellular radio transceiver.
  • the terminal nodes 110 are cellular radio transceivers.
  • the cellular network 100 is a third generation Partnership Project (3GPP) network in which the terminal nodes 110 are user equipment (UE) and the access nodes 120 are base stations.
  • 3GPP third generation Partnership Project
  • the network 100 is an Evolved Universal Terrestrial Radio Access network (E-UTRAN) .
  • the E-UTRAN consists of E-UTRAN NodeBs (eNBs) 120, providing the E-UTRA user plane and control plane (RRC) protocol terminations towards the UE 110.
  • the eNBs 120 are interconnected with each other by means of an X2 interface 126.
  • the eNBs are also connected by means of the S1 interface 128 to the Mobility Management Entity (MME) 129.
  • MME Mobility Management Entity
  • the network 100 is a Next Generation (or New Radio, NR) Radio Access network (NG-RAN) .
  • the NG-RAN consists of gNodeBs (gNBs) 120, providing the user plane and control plane (RRC) protocol terminations towards the UE 110.
  • the gNBs 120 are interconnected with each other by means of an X2/Xn interface 126.
  • the gNBs are also connected by means of the N2 interface 128 to the Access and Mobility management Function (AMF) .
  • AMF Access and Mobility management Function
  • a user equipment comprises a mobile equipment. Where reference is made to user equipment that reference includes and encompasses, wherever possible, a reference to mobile equipment.
  • the terminal device can be a user equipment (UE) .
  • the UE performs autonomous UE sidelink resource pool selection as described by selecting a partial sensing pattern 20 for sensing periodic sidelink packets and/or a partial sensing pattern 22 for sensing aperiodic sidelink packets. This saves power. This is useful is the mobile equipment is battery powered.
  • the UE can, for example, be a pedestrian UE, a public safety UE or other hand held UE involved in the sidelink transmissions.
  • the partial sensing UE can adaptively select the appropriate partial sensing duration (s) for its resource selection. For example, the sensing UE may adaptively select the partial sensing duration-1 (which corresponds to periodic packets) if periodic packets dominate the resource occupation in the resource pool, and vice versa. If both periodic and aperiodic packets occupy a large amount of resources, the sensing UE may adaptively use both the partial sensing durations for its partial sensing procedure. In this way, the scheme achieves good trade-off between power consumption reduction and mitigation of resource selection collisions.
  • the resource selection collisions with the periodic packets may increase to some extent. But it is the cost that have to be paid to achieve the benefits: 1) to avoid more severe/frequent collisions with the aperiodic packets; 2) at the same time to only use single partial sensing duration for power saving.
  • Fig 10 illustrates an example of a controller 400 suitable for use in an apparatus 110.
  • Implementation of a controller 400 may be as controller circuitry.
  • the controller 400 may be implemented in hardware alone, have certain aspects in software including firmware alone or can be a combination of hardware and software (including firmware) .
  • the controller 400 may be implemented using instructions that enable hardware functionality, for example, by using executable instructions of a computer program 406 in a general-purpose or special-purpose processor 402 that may be stored on a computer readable storage medium (disk, memory etc) to be executed by such a processor 402.
  • a general-purpose or special-purpose processor 402 may be stored on a computer readable storage medium (disk, memory etc) to be executed by such a processor 402.
  • the processor 402 is configured to read from and write to the memory 404.
  • the processor 402 may also comprise an output interface via which data and/or commands are output by the processor 402 and an input interface via which data and/or commands are input to the processor 402.
  • the memory 404 stores a computer program 406 comprising computer program instructions (computer program code) that controls the operation of the apparatus 110 when loaded into the processor 402.
  • the computer program instructions, of the computer program 406, provide the logic and routines that enables the apparatus to perform the methods illustrated in Figs 1 to 8.
  • the processor 402 by reading the memory 404 is able to load and execute the computer program 406.
  • the apparatus 110 therefore comprises:
  • processor 402 At least one processor 402;
  • At least one memory 404 including computer program code the at least one memory 404 and the computer program code configured to, with the at least one processor 402, cause the apparatus 110 at least to perform:
  • sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic sidelink packets based, at least, on the determined occupation of the sidelink communication resource pool by at least aperiodic sidelink packets;
  • selecting resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns.
  • the computer program 406 may arrive at the apparatus 110 via any suitable delivery mechanism 408.
  • the delivery mechanism 408 may be, for example, a machine readable medium, a computer-readable medium, a non-transitory computer-readable storage medium, a computer program product, a memory device, a record medium such as a Compact Disc Read-Only Memory (CD-ROM) or a Digital Versatile Disc (DVD) or a solid state memory, an article of manufacture that comprises or tangibly embodies the computer program 406.
  • the delivery mechanism may be a signal configured to reliably transfer the computer program 406.
  • the apparatus 110 may propagate or transmit the computer program 406 as a computer data signal.
  • Computer program instructions for causing an apparatus to perform at least the following or for performing at least the following:
  • sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic sidelink packets based, at least, on the determined occupation of the sidelink communication resource pool by at least aperiodic sidelink packets;
  • selecting resources for transmission of one or more sidelink packets based on the results of partial sensing using the selected sensing pattern or patterns.
  • the computer program instructions may be comprised in a computer program, a non-transitory computer readable medium, a computer program product, a machine readable medium. In some but not necessarily all examples, the computer program instructions may be distributed over more than one computer program.
  • memory 404 is illustrated as a single component/circuitry it may be implemented as one or more separate components/circuitry some or all of which may be integrated/removable and/or may provide permanent/semi-permanent/dynamic/cached storage.
  • processor 402 is illustrated as a single component/circuitry it may be implemented as one or more separate components/circuitry some or all of which may be integrated/removable.
  • the processor 402 may be a single core or multi-core processor.
  • references to ‘computer-readable storage medium’ , ‘computer program product’ , ‘tangibly embodied computer program’ etc. or a ‘controller’ , ‘computer’ , ‘processor’ etc. should be understood to encompass not only computers having different architectures such as single /multi-processor architectures and sequential (Von Neumann) /parallel architectures but also specialized circuits such as field-programmable gate arrays (FPGA) , application specific circuits (ASIC) , signal processing devices and other processing circuitry.
  • References to computer program, instructions, code etc. should be understood to encompass software for a programmable processor or firmware such as, for example, the programmable content of a hardware device whether instructions for a processor, or configuration settings for a fixed-function device, gate array or programmable logic device etc.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
  • the blocks illustrated in the Figs 1 to 8 may represent steps in a method and/or sections of code in the computer program 406.
  • the illustration of a particular order to the blocks does not necessarily imply that there is a required or preferred order for the blocks and the order and arrangement of the block may be varied. Furthermore, it may be possible for some blocks to be omitted.
  • sensing pattern 20 for periodic sidelink packets and/or a sensing pattern 22 for aperiodic sidelink packets based, at least, on the determined resource occupation by at least aperiodic sidelink packets
  • selecting resources for transmission of one or more sidelink packets based on the results of sensing using the selected sensing pattern or patterns.
  • the above described examples find application as enabling components of: automotive systems; V2X, especially V2P, telecommunication systems; electronic systems including consumer electronic products; distributed computing systems; media systems for generating or rendering media content including audio, visual and audio visual content and mixed, mediated, virtual and/or augmented reality; personal systems including personal health systems or personal fitness systems; navigation systems; user interfaces also known as human machine interfaces; networks including cellular, non-cellular, and optical networks; ad-hoc networks; the internet; the internet of things; virtualized networks; and related software and services.
  • a property of the instance can be a property of only that instance or a property of the class or a property of a sub-class of the class that includes some but not all of the instances in the class. It is therefore implicitly disclosed that a feature described with reference to one example but not with reference to another example, can where possible be used in that other example as part of a working combination but does not necessarily have to be used in that other example.
  • the presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself and also to features that achieve substantially the same technical effect (equivalent features) .
  • the equivalent features include, for example, features that are variants and achieve substantially the same result in substantially the same way.
  • the equivalent features include, for example, features that perform substantially the same function, in substantially the same way to achieve substantially the same result.

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

Abstract

Un appareil comprend des moyens pour : déterminer l'occupation d'un groupe de ressources de communication sur liaison latérale par au moins des paquets de liaison latérale apériodiques ; sélectionner un motif de détection pour des paquets de liaison latérale périodiques et/ou un motif de détection pour des paquets de liaison latérale apériodiques, au moins sur la base de l'occupation déterminée du groupe de ressources de communication sur liaison latérale par au moins des paquets de liaison latérale apériodiques ; et sélectionner des ressources pour la transmission d'un ou de plusieurs paquet(s) de liaison latérale sur la base des résultats de la détection à l'aide du ou des motif(s) de détection sélectionné(s).
PCT/CN2020/123432 2020-10-23 2020-10-23 Communication sur liaison latérale Ceased WO2022082787A1 (fr)

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