WO2021063521A1 - Nœud de réseau et procédé pour effectuer une transmission de liaison latérale - Google Patents

Nœud de réseau et procédé pour effectuer une transmission de liaison latérale Download PDF

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Publication number
WO2021063521A1
WO2021063521A1 PCT/EP2019/076951 EP2019076951W WO2021063521A1 WO 2021063521 A1 WO2021063521 A1 WO 2021063521A1 EP 2019076951 W EP2019076951 W EP 2019076951W WO 2021063521 A1 WO2021063521 A1 WO 2021063521A1
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WIPO (PCT)
Prior art keywords
transmission
transmit power
network node
path loss
priority
Prior art date
Application number
PCT/EP2019/076951
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English (en)
Inventor
Mate BOBAN
Ramya Panthangi MANJUNATH
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2019/076951 priority Critical patent/WO2021063521A1/fr
Priority to CN201980100686.2A priority patent/CN114503690A/zh
Publication of WO2021063521A1 publication Critical patent/WO2021063521A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
    • 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 present application relates to the field of mobile communication and in particular to a network node and a method for performing sidelink (SL) transmission. More specifically, the present application relates to prioritized power control for Vehicle-to-Everything (V2X) SL in the context of 5G New Radio (NR) V2X.
  • V2X Vehicle-to-Everything
  • NR 5G New Radio
  • 5G NR V2X communication complements LTE V2X (from Rel. 14 and 15) and supports advanced V2X use cases such as vehicle platooning, extended sensors, advanced driving, and remote driving. It is further feasible to support unicast, group cast and broadcast operation in SL via PC5 interface, enables coexistence between SL and other cellular transmissions in a carrier, provides in-coverage, partial coverage, and out-of-coverage operation, as well as cross-RAT (Radio Access Technology) control.
  • LTE V2X from Rel. 14 and 15
  • advanced V2X use cases such as vehicle platooning, extended sensors, advanced driving, and remote driving.
  • cross-RAT Radio Access Technology
  • NR V2X SL Power Control provides open- loop power control (OLPC) procedures that are supported for SL.
  • OLPC open- loop power control
  • a transmitting SL user equipment (UE) is in-coverage
  • a Next Generation Node B (gNB) can enable OLPC for a unicast, groupcast or broadcast transmission based on the path loss between the transmitting UE and its serving gNB in order to mitigate interference to the gNB's UL reception.
  • pre- at least for unicast, (pre-)configuration can enable also using the path loss between a transmitting and receiving UE.
  • SL power control mechanisms have considered avoiding interference to Uu transmissions: certain applications may require guarantees for SL transmissions (e.g., high priority Vehicle-to- Vehicle (V2V) applications), meaning successful SL packet reception is crucial.
  • V2V Vehicle-to- Vehicle
  • determining the transmit power for a particular SL transmission by compensating for Uu path loss and interference conditions may not ensure successful packet reception at the SL receiver as the path loss and interference conditions associated with UL/DL and SL can vary significantly.
  • FIG. 20 shows example scenarios of high priority SL transmissions (e.g. over the PC5 interface) interfered by Uu transmissions on a shared Uu/SL carrier:
  • Example 1 Uu transmissions in shared carrier are known to be low priority (e.g., MBB traffic), defined either statically (always) or dynamically (configuration/ signaling) .
  • Example 2 (SL Mode 2): Mode 2 transmission in partial coverage, UE detects lower priority Uu transmission.
  • LIG. 21 shows example scenarios of interference due to multiple uncoordinated SL transmissions on same resources:
  • Example 3 Two or more uncoordinated (e.g., Mode 1 & Mode 2 shared resource) SL transmissions of in a same RB.
  • Example 4 Two or more Mode 2 GL transmissions with overlapping TLRPs.
  • the 3GPP standard addresses the problem of SL transmit power control: V2V communications power control is supported by the 3 GPP standard LTE-A Releases 14 and 15, as well as the upcoming standard NR (New Radio) Release 16. Irrespective of the mode of the SL transmission, the provided solutions in Release 14 and 15, as well as upcoming standard NR Release 16, consider power values computed based on DL path loss compensation or DL and SL path loss compensations, and maximum allowed transmit power. Additionally, in NR Release 16, separately configuring parameters such as, Po and alpha values, for DL and SL of the existing power control equation are considered. In particular Po is the power a UE can transmit if the measured path loss is OdB. In particular, alpha is a path loss compensation factor. In particular, these parameters (Po and alpha) can be configured by higher layers based on resource configuration.
  • the prior art limits the number of power values that can be assigned to a SL transmitter to: maximum allowed transmit power or appropriately chosen path loss compensation based transmit power. Setting different values for certain parameters such as Po and alpha in the existing power control scheme or its modifications for path loss compensated transmit power values may not necessarily increase the range of transmit power values that a SL transmitter can be assigned with. The limited number of SL transmit power values may be insufficient to enable SL reachability due to unknown interference at the SL receiver. If a maximum allowed transmit power is chosen, it may not be required for the specific SL application or can result in increased interference.
  • the present invention aims to improve the conventional network nodes for performing SL transmission.
  • the embodiments of the invention in particular allow to determine the SL transmit power for unicast and groupcast transmissions to improve the probability of successful packet reception at the SL receiver(s) for high priority SL transmissions by considering at least one of: priority of SL transmissions relative to Uu or other SL transmissions; coverage scenarios (in-coverage, partial coverage and out-of-coverage);
  • embodiments of the invention allow for joint consideration of SL transmission priority and receiver interference for SL transmit power control. This addresses the case of one SL transmission being prioritized over another SL transmission. This also provides transmit power control for SL in groupcast case, as well as in different coverage scenarios for SL transmissions.
  • a first aspect of the present invention provides a network node for performing side link, SL, transmission, wherein the network node is configured to obtain a transmit power value for a SL transmission, the transmit power value being defined according to a comparison of a first priority indication of the SL transmission with a second priority indication.
  • the second priority indication can be a priority of one or more concurrent transmissions or a default value (e.g., configured or preconfigured by the gNB).
  • the present invention also allows for prioritizing SL transmissions over concurrent uplink transmissions in terms of transmit power, and allows for prioritizing SL transmissions over another SL transmission in terms of transmit power.
  • the present invention ensures that the aspect of SL priority and interference at the SL receiver is included in computing the transmit power. Moreover, a solution for power control in case of relevant SL coverage scenarios is provided.
  • the network node may be a base station, or a user equipment.
  • the first priority indication indicates a priority of an application or a transmission type associated with or of a type of the SL transmission and the second priority indication indicates a priority of an application or a transmission type associated with or of a type of the one or more concurrent transmissions.
  • the one or more concurrent transmissions include at least one SL transmission and/or at least one Uu transmission.
  • the priority can be mapped to an application (e.g. emergency service) or to a transmission type (e.g., higher priority of unicast transmission, lower priority of broadcast transmission).
  • the application is a V2X application, e.g. for implementing co-operative awareness.
  • the application may be included in several classes, such as road safety, traffic efficiency, etc.
  • the transmit power value is defined according to a comparison of a first priority indication of the SL transmission with a second priority indication of one or more concurrent transmissions.
  • the first priority indication indicates a priority of an application associated with the SL transmission and/or the first priority indication indicates a priority of a type of the SL transmission.
  • the second priority indication indicates a priority of an application associated with the one or more concurrent transmissions and/or the second priority indication indicates a priority of a type of the one or more concurrent transmissions.
  • the second priority can be explicitly indicated by an entity involved in concurrent transmission or can be set to a default value (e.g., by gNB).
  • the default value for second priority indicates to the transmitter of the SL transmission with first priority the assumed priority of any concurrent transmission (e.g., in case the second priority indication is not received for initial transmission, or in case where the SL transmission with the first priority has stringent latency requirement and waiting to receive the second priority indication would violate that latency requirement).
  • the transmit power value is further defined according to a comparison of the priority of the SL transmission to a priority of a Uu transmission.
  • the Uu transmission is transmitted or received by a base station.
  • the priority of the Uu transmission is obtained in the BS.
  • the network node is further configured to compare the priority of the SL transmission to a priority of a Uu transmission or of at least one other SL transmission, to determine the transmit power value.
  • the at least one other SL transmission is transmitted or received by at least one other UE.
  • the at least one other UE is in coverage of a BS (which includes the network node).
  • the priority of the at least one other SL transmission can be signaled by the UE to the BS directly or to another UE.
  • the at least one other UE is not in coverage of the BS.
  • the priority of the at least one other SL transmission can be signaled by the UE to the BS indirectly (i.e. it is forwarded by other entities), or can be preconfigured in the BS by the UE (i.e. at an earlier time when the UE is in coverage of the BS).
  • the transmit power value is further based on an interference value obtained from a receiver of the SL transmission, if the first priority indication is higher than the second priority indication.
  • the transmit power value can be determined both based on a priority and on an interference value of a transmission. That is, more values can be considered when determining the transmit power value.
  • the interference value relates to interference due to one or more UE transmissions, one or more SL transmissions, or a combination of UE and SL transmissions.
  • the interference value relates to an interference of the SL transmission with a Uu transmission, experienced at the receiver of the SL transmission.
  • the Uu transmission is transmitted or received by the base station.
  • the interference value indicates how signal reception at the receiver of the SL transmission is interfered by the Uu transmission.
  • the interference value relates to an interference of the SL transmission with at least one other SL transmission, experienced at the receiver of the SL transmission.
  • the at least one other SL transmission is transmitted or received by at least one other UE (e.g. the at least one other UE is in coverage of the BS or out of coverage of the BS).
  • the interference value indicates how signal reception at the receiver of the SL transmission is interfered by the at least one other SL transmission.
  • the transmit power value is further based on a SL path loss value obtained from a receiver of the SL transmission.
  • the path loss value relates to Uu path loss of a Uu transmission, experienced at the receiver of the SL transmission.
  • the receiver of the SL transmission also receives Uu transmission from the BS, based on which the path loss is detected.
  • the path loss value further relates to path loss of the SL transmission and/or at least one other SL transmission experienced at the receiver of the SL transmission.
  • the receiver of the SL transmission determines the pass loss based on the SL transmission that is received from the UE. Additionally or alternatively, the receiver of the SL transmission (which is intended to receive the SL transmission of the UE) also receives SL transmission from at least one other UE. Based on the SL transmission from the at least one other UE, the pass loss can be determined.
  • path loss value is beneficial as the transmit power value can be determined both based on a priority and on the path loss value. That is, more values can be considered when determining the transmit power value.
  • the network node is further configured to compare the SL path loss value with the Uu path loss value, wherein the transmit power value is further based on the SL path loss value exclusively, if the SL path loss value is larger than the Uu path loss value.
  • the transmit power value is further based on the SL path loss value exclusively, if the first priority indication is higher than the second priority indication.
  • the comparison is done without the need of receiving the second priority indication and the transmit power is calculated based only on the path loss of the SL transmission associated with the first priority indication.
  • the network node is configured to receive the second priority indication from an entity involved in a concurrent transmission, or the second priority indication is pre-set to a default value in the network node.
  • the transmit power value is set to a pre defined value, if the first priority indication is associated to a predefined set of applications or transmission types.
  • the SL transmission associated with the first priority indication is terminated.
  • the SL transmission is a unicast transmission and/or a group-cast transmission.
  • the network node is a Base Station and is further configured to transmit the obtained transmit power value to a User Equipment, UE, in coverage of the Base Station.
  • the UE is in coverage of the base station, the base station is further configured to update an SL transmit power in the UE based on the transmit power value.
  • the base station is further configured to preconfigure an SL transmit power in the UE based on the transmit power configuration.
  • the network node is further configured to preconfigure constraints in the UE, based on which the preconfigured SL transmit power is activated.
  • the network node is a User Equipment, UE, and is further configured to perform SL transmission using the obtained transmit power value.
  • a second aspect of the present invention provides a method for performing side link, SL, transmission, wherein the method comprises the steps of obtaining, by a network node, a transmit power value for a SL transmission, the transmit power value being defined according to a comparison of a first priority indication of the SL transmission with a second priority indication of one or more concurrent transmissions.
  • the first priority indication indicates a priority of an application associated with or of a type of the SL transmission and the second priority indication indicates a priority of an application associated with or of a type of the one or more concurrent transmissions.
  • the method further includes comparing, by the network node, the priority of the SL transmission to a priority of a Uu transmission or of at least one other SL transmission, to determine the transmit power value.
  • the transmit power value is further based on an interference value obtained from a receiver of the SL transmission, if the first priority indication is higher than the second priority indication.
  • the transmit power value is further based on a SL path loss value obtained from a receiver of the SL transmission.
  • the path loss value relates to Uu path loss of a Uu transmission, experienced at the receiver of the SL transmission.
  • the path loss value further relates to path loss of the SL transmission and/or at least one other SL transmission experienced at the receiver of the SL transmission.
  • the method further includes comparing, by the network node, the SL path loss value with the Uu path loss value, wherein the transmit power value is further based on the SL path loss value exclusively, if the SL path loss value is larger than the Uu path loss value.
  • the transmit power value is further based on the SL path loss value exclusively, if the first priority indication is higher than the second priority indication.
  • the method further includes the step of receiving, by the network node, the second priority indication from an entity involved in a concurrent transmission, or the second priority indication is pre-set to a default value in the network node.
  • the transmit power value is set to a pre defined value, if the first priority indication is associated to a predefined set of applications or transmission types.
  • the SL transmission is a unicast transmission and/or a group-cast transmission.
  • the network node is a Base Station and the method further includes the step of transmitting, by the network node, the obtained transmit power value to a User Equipment, UE, in coverage of the Base Station.
  • the UE is in coverage of the base station, and the method further includes the step of updating, by the base station, an SL transmit power in the UE based on the transmit power value.
  • the method further includes preconfiguring, by the base station, an SL transmit power in the UE based on the transmit power configuration. In a further implementation form of the second aspect, the method further includes preconfiguring, by the base station, constraints in the UE, based on which the preconfigured SL transmit power is activated.
  • the network node is a User Equipment, UE, and the method further includes the step of performing, by the UE, SL transmission using the obtained transmit power value.
  • the second aspect and its implementation forms include the same advantages as the first aspect and its respective implementation forms.
  • a third aspect of the present invention provides a computer program which, when executed by a processor, causes the method of the second aspect or any of its implementation forms to be performed.
  • a further aspect of the invention also relates to a computer program product comprising a computer readable medium and said mentioned computer program, wherein said computer program is included in the computer readable medium, and the computer medium comprises of one or more from the group: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically EPROM) and hard disk drive.
  • ROM Read-Only Memory
  • PROM PROM
  • EPROM Erasable PROM
  • Flash memory Flash memory
  • EEPROM Electrically EPROM
  • FIG. 1 shows a schematic view of a network device according to an embodiment of the present invention.
  • FIG. 2 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 3 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 4 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 5 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 6 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 7 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 8 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 9 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 10 shows a schematic view of an operating scenario according to the present invention.
  • FIG. 11 shows unicast SF power control mechanisms according to the present invention.
  • FIG. 12 shows group cast SF power control mechanisms according to the present invention.
  • FIG. 13 shows unicast SF power control mechanisms according to the present invention.
  • FIG. 14 shows group cast SF power control mechanisms according to the present invention.
  • FIG. 15 shows a schematic view of a signaling scenario according to the present invention.
  • FIG. 16 shows a schematic view of a signaling scenario according to the present invention.
  • FIG. 17 shows a schematic view of a signaling scenario according to the present invention.
  • FIG. 18 shows a power control mechanism according to the present invention.
  • FIG. 19 shows a schematic view of a method according to an embodiment of the present invention.
  • FIG. 20 shows a schematic view of an operating scenario according to the prior art.
  • FIG. 21 shows a schematic view of operating scenario according to the prior art.
  • FIG. 1 shows a schematic view of a network node 100 according to an embodiment of the present invention.
  • the network node 100 is for performing SL transmission and is configured to obtain a transmit power value 101 for a SL transmission, the transmit power value 101 being defined according to a comparison of a first priority indication 102 of the SL transmission with a second priority indication 103 of one or more concurrent transmissions.
  • the network node 100 can be a base station BS or can be a user equipment UE, in particular a SL UE.
  • the first priority indication 102 optionally indicates a priority of an application associated with or of a type of the SL transmission.
  • the second priority indication 103 optionally indicates a priority of an application associated with or of a type of the one or more concurrent transmissions.
  • the network node 100 further optionally can compare the priority of the SL transmission to a priority of a Uu transmission or of at least one other SL transmission, to determine the transmit power value.
  • SL transmissions prioritized over Uu transmissions for: o NR SL Mode 1 (BS-scheduled SL) transmissions (Scenario 1), or o NR SL Mode 2 (autonomously scheduled SL) transmissions (Scenario 2); Multiple SL transmissions with different priorities (Scenario 3).
  • FIG. 2 illustrates Scenario la, where high priority SL transmissions are not interfered by Uu transmissions.
  • the SL UE(s) (transmitter and receiver) are under BS coverage.
  • a solution is to adapt transmit power of the TX UE to reach the receiver by overcoming SL path loss.
  • the SL transmit power can be updated either by the BS or the SL transmitter (the UE).
  • LIG. 3 illustrates Scenario lb, where Uu transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver) are under BS coverage.
  • a solution is to adapt SL Tx power to reach the receiver by overcoming interference at the Rx UE and SL path loss.
  • the SL transmit power can be updated either by the BS or by the SL transmitter.
  • LIG. 4 illustrates scenario lc, where Uu transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver) are under partial BS coverage, that is, the SL transmitter is in-coverage, the SL receiver is out-of-coverage.
  • a solution is to adapt the SL Tx power to reach the receiver by overcoming interference at Rx and SL path loss.
  • SL transmit power can be updated either by the BS or the SL transmitter.
  • LIG. 5 illustrates scenario 2a, where high priority SL transmissions are not interfered by Uu transmissions.
  • the SL UE(s) (transmitter and receiver) are under BS coverage.
  • a solution is to adapt transmit power to reach the receiver by overcoming SL path loss.
  • SL transmit power can be updated either by the BS or SL transmitter.
  • FIG. 6 illustrates scenario 2b, where Uu transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver) are under BS coverage.
  • a solution is to adapt SL Tx power to reach the receiver by overcoming interference at the Rx UT, and SL path loss.
  • SL transmit power can be updated either by the BS or the SL transmitter.
  • FIG. 7 illustrates scenario 2c, where Uu transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver) are under partial or out of BS coverage.
  • a solution is to adapt SL Tx power to reach the receiver by overcoming interference at the Rx UE and SL path loss.
  • the SL transmit power can be updated either by the BS or the SL transmitter.
  • LIG. 8 illustrates scenario 3a, where high priority SL transmission is not interfered by other SL transmissions.
  • the SL UE(s) (transmitter and receiver pairs) are under BS coverage.
  • a solution is to adapt SL Tx power to reach the receiver by overcoming mainly SL path loss.
  • the SL transmit power can be updated either by the BS or the SL transmitter.
  • LIG. 9 illustrates scenario 3b, where simultaneous SL transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver pairs) are under BS coverage.
  • a solution is to a adapt SL Tx power to reach the receiver by overcoming mainly interference and SL path loss.
  • the SL transmit power can be updated either by the BS or SL transmitter.
  • LIG. 10 illustrates scenario 3c, where simultaneous SL transmissions interfere with high priority SL transmissions.
  • the SL UE(s) (transmitter and receiver pairs) are under partial or out of BS coverage.
  • a solution is to adapt SL Tx power to reach the receiver by overcoming mainly interference and SL path loss.
  • the SL transmit power can be updated either by the BS or SL transmitter.
  • the transmit power value 101 can be based on an interference value obtained from a receiver of the SL transmission, if e.g. the first priority indication 102 is higher than the second priority indication 103.
  • the transmit power value 101 can further be based on a SL path loss value obtained from a receiver of the SL transmission (that is, one of the above receiving SL UEs).
  • the path loss value also can relate to Uu path loss of a Uu transmission, experienced at the receiver of the SL transmission (that is, one of the above receiving SL UEs).
  • the path loss value further can relate to path loss of the SL transmission and/or at least one other SL transmission experienced at the receiver of the SL transmission.
  • the SL path loss value can be compared with the Uu path loss value, wherein the transmit power value 101 is further based on the SL path loss value if the SL path loss value is larger than the Uu path loss value and if the first priority indication 102 is higher than the second priority indication 103.
  • the transmit power value 101 can be set to a pre-defmed value, if the first priority indication 102 is associated to a predefined set of applications or transmission types.
  • the enhancements of the present invention to enable priority based SL power control are now going to be described in view of FIG. 11 to FIG. 14 in more detail.
  • the present invention in particular modifies the existing LTE SL power control mechanism for Mode 1 and Mode 2 described in 3GPP TS 36.213.
  • SL transmit power for high priority SL transmissions can either be set to a certain pre-determined maximum value (Pma PCS IC / P max PC 5 oc ) or to a value depending on the path loss and interference at the receiver given by the function f((Popcs + 10 log (M) + apes PLpcs), Pmax PCS IC) which is lower bounded by: (Popes + 10 log (M) + apes PLpcs) and upper bounded by: Pmax PCS IC.
  • Parameters Popes and apes are either pre-configured or can be determined based on interference information available at the entity configuring the transmit power (SL Tx or gNB).
  • Pmax PCS IC is the maximum SL transmit power for a SL UE transmitter in-coverage of a base station.
  • Pma PCS oc is the maximum SL transmit power for a SL UE transmitter out-of-coverage of a base station.
  • Popes is the power the UE can transmit on the SL if the measured path loss from the respective SL receiver is OdB.
  • M is the number of assigned resource blocks.
  • apes is a SL path loss compensation factor.
  • PLpcs is path loss measured at the SL receiver.
  • the function f((Popcs + 10 log (M) + apes PLpcs), Pmax PCS IC) is any function that determines the SL transmission that improves the packet reception success at the SL receiver for high priority SL transmissions, considering the link quality between the receiver and the transmitter and the interference at the receiver.
  • the function f (PLpcs j , ... PLpcs N) is any function that determines a single representative path loss value for a group (e.g. min(), max(), or mean()) of multiple path loss values.
  • Application type e.g., to enable transmission at max power for emergency applications.
  • Interference-based power setting which might not be as critical as emergency, but has higher priority compared to Uu transmissions. Compared to case 1), some SL applications that are not as critical as emergency could benefit by compensating appropriately for interference at the receiver, as it can minimize interference and improve the probability of successful reception.
  • the proposed modifications further introduce additional variables for max power of SL transmission in and out of coverage (Pmax PCS ic , Pmax PCS oc ). This allows for limiting interference to Uu in coverage (in case of uncoordinated transmissions), and can be provided through configuration (e.g., by BS or via pre-configuration).
  • the above power control mechanism is in particular applied to the previously described scenarios. Specifically, the modifications are presented in FIG. 11 for SL/UL power control for Unicast (both in-coverage and out of coverage), FIG. 12 for SL/UL power control for Group cast (both in-coverage and out of coverage), FIG. 13 for SL/SL power control for Unicast (both in-coverage and out of coverage), and FIG. 14 for SL/SL power control for Group cast (both in-coverage and out of coverage).
  • the choice of the variables B1 and B2 will decide whether the SL transmission is prioritized over the other transmissions (either the UL or another SL transmission); in case the SL transmission is prioritized, it will effectively ignore the impact it has on the interference of other transmissions.
  • the values that the variables can hold are based on different factors that are described in the table associated with each of said four figures. Value ‘ 1 ’ indicates the part of the equation that is computed to determine the transmit power.
  • the Bi part of the equation corresponds to the SL transmission for which the transmit power needs to be determined.
  • the B2part corresponds to another SL transmission in the vicinity of Bi SL transmission.
  • Tx power is is determined straightforward from the above equation. If B2 is prioritized over Bi (UC), Tx power is determined by a function that considers path loss associated with Bi part (Popes + 10 log (M) + apes PLpcs 1), interference at Rx for Bi part, and upper bounded by Pmax PCS ic2 (which is the max SL transmit power given SL transmission associated with B2 is prioritized).
  • Bi and B2 hold values provided in the table in Fig. 14. The above is in particular relevant for in- and out-of-coverage scenarios.
  • the SL transmitter UE(s) can be in-coverage of the BS (Scenarios: la, lb, 2a, 2b, 3a, 3b).
  • BS or SL transmitter UE can determine the transmit power parameters.
  • the receiver interference information e.g. SINR
  • SINR the receiver interference information
  • the SL transmitter UE(s) can also be out-of-coverage of the BS (Scenarios: lc, 2c, 3c):
  • the SL transmitter UE can determine the transmit power parameters. Transmit power parameters can be either pre-configured or informed to the UE when in-coverage.
  • the receiver interference information e.g. SINR
  • SINR can be shared with the SL transmitter to determine the transmit power.
  • the Rel. 14 power control equation can be extended to include the SL path loss (which is in line with statements above) as it is shown in FIG. 18.
  • Modifying the parameters of the equation of FIG. 18 allows for a "soft" switching of the priorities between Uu and SL path loss, i.e. the parameters can be chosen such that only SL path loss is considered.
  • compensating for SL path loss only may not always ensure successful reception over the SL, mainly due to interference at the receiver.
  • the present invention provides a solution to combat jointly both path loss and interference in case of SL prioritized over UL. In relation to the equation of FIG. 18, this means that in extreme cases where there is high priority application on SL and interference is high, disregarding the PL for both SL and UL and using PMax directly.
  • the purpose of the equation and the added variables are: to appropriately determine the SL transmit power based on multiple criteria such as those mentioned above; if SL is prioritized, determine the transmit power based on both the SL path loss and any existing interference to improve reception success e.g., referring to the equation above.
  • B2 will be 1 and f((P0_PC5%) will be used.
  • B2 will be 1 and P_max_PC5_IC will be used; and in addition to determining priority between Uu and PC5, the present invention also enables prioritizing a certain SL unicast/group cast transmission with respect to other SL unicast/group cast transmissions.
  • FIG. 19 shows a schematic view of a method 1900 according to an embodiment of the present invention.
  • the method 1900 is for performing SL transmission and comprises the step of obtaining 1901, by a network node 100, a transmit power value 101 for a SL transmission, the transmit power value 101 being defined according to a comparison of a first priority indication 102 of the SL transmission with a second priority indication 103 of one or more concurrent transmissions.

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

Abstract

La présente invention concerne le domaine de la communication mobile et en particulier un nœud de réseau et un procédé pour effectuer une transmission par liaison latérale (SL). Plus précisément, la présente invention concerne la commande de puissance prioritaire pour une SL de Vehicle-to-Everything (V2X) dans le contexte de la nouvelle radio 5G (NR) V2X. La présente invention concerne un nœud de réseau pour effectuer une transmission SL, dans laquelle le nœud de réseau est configuré pour obtenir une valeur de puissance d'émission pour une transmission SL, la valeur de puissance d'émission étant définie selon une comparaison d'une première indication de priorité de la transmission SL avec une seconde indication de priorité d'une ou plusieurs transmissions concurrentes.
PCT/EP2019/076951 2019-10-04 2019-10-04 Nœud de réseau et procédé pour effectuer une transmission de liaison latérale WO2021063521A1 (fr)

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CN201980100686.2A CN114503690A (zh) 2019-10-04 2019-10-04 用于执行侧行链路传输的网络节点和方法

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