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WO2024170688A1 - Attribution de ressources de signal de référence de positionnement de liaison latérale d'équipement utilisateur - Google Patents

Attribution de ressources de signal de référence de positionnement de liaison latérale d'équipement utilisateur Download PDF

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Publication number
WO2024170688A1
WO2024170688A1 PCT/EP2024/053877 EP2024053877W WO2024170688A1 WO 2024170688 A1 WO2024170688 A1 WO 2024170688A1 EP 2024053877 W EP2024053877 W EP 2024053877W WO 2024170688 A1 WO2024170688 A1 WO 2024170688A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
reference signal
positioning reference
sidelink
resources
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
Application number
PCT/EP2024/053877
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English (en)
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WO2024170688A9 (fr
Inventor
Mohammad Alawieh
Birendra GHIMIRE
Ernst Eberlein
Thomas VON DER GRÜN
Olivier RENAUDIN
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.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
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Publication of WO2024170688A1 publication Critical patent/WO2024170688A1/fr
Publication of WO2024170688A9 publication Critical patent/WO2024170688A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
    • 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 invention relates to the field of wireless communication systems or networks, more specifically to user equipment sidelink positioning reference signal resource allocation.
  • the base stations are provided to serve users within a cell.
  • the one or more base stations may serve users in licensed and/or unlicensed bands.
  • base station refers to a gNB in 5G networks, an eNB in UMTS/LTE/LTE-A/ LTE-A Pro, or just a BS in other mobile communication standards.
  • a user may be a stationary device or a mobile device.
  • the wireless communication system may also be accessed by mobile or stationary loT (Internet of Things) devices which connect to a base station or to a user.
  • the mobile devices or the loT devices may include physical devices, ground based vehicles, such as robots or cars, aerial vehicles, such as manned or unmanned aerial vehicles, UAVs, the latter also referred to as drones, buildings and other items or devices having embedded therein electronics, software, sensors, actuators, or the like as well as network connectivity that enables these devices to collect and exchange data across an existing network infrastructure.
  • Fig. 11 (b) shows an exemplary view of five cells, however, the RAN n may include more or less such cells, and RAN n may also include only one base station.
  • FIG. 11(b) shows two loT devices 110i and HO2 in cell IO64, which may be stationary or mobile devices.
  • the loT device 110i accesses the wireless communication system via the base station gNB4 to receive and transmit data as schematically represented by arrow 112i.
  • the loT device HO2 accesses the wireless communication system via the user UE3 as is schematically represented by arrow 1122.
  • the respective base stations gNBi to gNBs may be connected to the core network 102, e.g. via the S1 interface, via respective backhaul links 114i to 114s, which are schematically represented in Fig. 11(b) by the arrows pointing to “core”.
  • the core network 102 may be connected to one or more external networks.
  • the external network may be the Internet or a private network, such as an intranet or any other type of campus networks, e.g. a private WiFi or 4G or 5G mobile communication system.
  • some or all of the respective base stations gNBi to gNBs may be connected, e.g.
  • a sidelink channel allows direct communication between UEs, also referred to as device-to-device, D2D (Device to Device), communication.
  • D2D Device to Device
  • the sidelink interface in 3GPP (3G Partnership Project) is named PC5 (Proximity-based Communication 5).
  • the physical resource grid may comprise a set of resource elements to which various physical channels and physical signals are mapped.
  • the physical channels may include the physical downlink, uplink and sidelink shared channels, PDSCH (Physical Downlink Shared CHannel), PLISCH (Physical Uplink Shared Channel), PSSCH (Physical Sidelink Shared Channel), carrying user specific data, also referred to as downlink, uplink and sidelink payload data, the physical broadcast channel, PBCH (Physical Broadcast Channel), carrying for example a master information block, MIB, and one or more of a system information block, SIB, one or more sidelink information blocks, SLIBs, if supported, the physical downlink, uplink and sidelink control channels, PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control CHannel), PSSCH, carrying for example the downlink control information, DCI, the uplink control information, UCI, and the sidelink control information, SCI, and physical sidelink
  • PDSCH Physical Downlink Shared CHanne
  • the physical channels may further include the physical random-access channel, PRACH (Packet Random Access Channel) or RACH (Random Access Channel), used by UEs for accessing the network once a UE synchronized and obtained the MIB and SIB.
  • the physical signals may comprise reference signals or symbols, RS, synchronization signals and the like.
  • the resource grid may comprise a frame or radio frame having a certain duration in the time domain and having a given bandwidth in the frequency domain.
  • the frame may have a certain number of subframes of a predefined length, e.g. 1ms.
  • OFDM Orthogonal Frequency-Division Multiplexing
  • a frame may also include of a smaller number of OFDM symbols, e.g. when utilizing a shortened transmission time interval, sTTI (slot or subslot transmission time interval), or a mini- slot/non-slot-based frame structure comprising just a few OFDM symbols.
  • Other waveforms like non-orthogonal waveforms for multiple access, e.g. filter-bank multicarrier, FBMC, generalized frequency division multiplexing, GFDM, or universal filtered multi carrier, LIFMC, may be used.
  • the wireless communication system may operate, e.g., in accordance with the LTE-Advanced pro standard, or the 5G or NR, New Radio, standard, or the NR-U, New Radio Unlicensed, standard.
  • the wireless network or communication system depicted in Fig. 11 may be a heterogeneous network having distinct overlaid networks, e.g., a network of macro cells with each macro cell including a macro base station, like base stations gNBi to gNBs, and a network of small cell base stations, not shown in Fig. 11 , like femto or pico base stations.
  • NTN non-terrestrial wireless communication networks
  • the non-terrestrial wireless communication network or system may operate in a similar way as the terrestrial system described above with reference to Fig. 11 , for example in accordance with the LTE-Advanced Pro standard or the 5G or NR, new radio, standard.
  • UEs that communicate directly with each other over one or more sidelink, SL, channels e.g., using the PC5/PC3 interface or WiFi direct.
  • UEs that communicate directly with each other over the sidelink may include vehicles communicating directly with other vehicles, V2V communication, vehicles communicating with other entities of the wireless communication network, V2X communication, for example road side units, RSUs, or road side entities, like traffic lights, traffic signs, or pedestrians.
  • An RSU may have a functionality of a BS or of a UE, depending on the specific network configuration.
  • Other UEs may not be vehicular related UEs and may comprise any of the above-mentioned devices. Such devices may also communicate directly with each other, D2D communication, using the SL channels.
  • a wireless communication network like the one depicted in Fig. 11 , it may be desired to locate a UE with a certain accuracy, e.g., determine a position of the UE in a cell.
  • Several positioning approaches are known, like satellite-based positioning approaches, e.g., autonomous and assisted global navigation satellite systems, A-GNSS, such as GPS, mobile radio cellular positioning approaches, e.g., observed time difference of arrival, OTDOA, and enhanced cell ID, E-CID, or combinations thereof.
  • TDOA based solutions For positioning applications different methods are distinguished, namely TDOA based solutions (UL-TDOA, OTDOA, etc.) requires synchronized anchors, and RTT based solutions measure the distance (range) to neighbors. For this method a full synchronization is not required.
  • the measurements are performed (nearly) at the same time.
  • the time/frequency resources used by the transmitted reference signals should coordinated accordingly to fulfill this requirement. Furthermore, sharing the time/frequency resources by several devices reduces the total number of required resources or allows a higher measurement repetition rate.
  • Rel-18 needs to support of resource allocation for SL PRS for resource allocation Scheme 2, where Scheme 2 corresponds to UE autonomous SL PRS resource allocation.
  • Scheme 2 corresponds to UE autonomous SL PRS resource allocation.
  • consideration for supporting sensing-based resource allocation, and a random resource selection needs to be taken into account.
  • the solution might make use of congestion control for SL PRS and/or inter-UE coordination.
  • the UE autonomously selects communication sidelink resource(s) from resource pool(s) provided by broadcast system information or dedicated signalling while inside NG-RAN coverage or by pre-configuration while outside NG-RAN coverage.
  • the resource pool(s) can be provided for a given validity area where the UE does not need to acquire a new pool of resources while moving within the validity area, at least when this pool is provided by SIB.
  • the UE is allowed to temporarily use UE autonomous resource selection with random selection for sidelink transmission based on configuration of the exceptional transmission resource pool.
  • a first user equipment for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging within a Radio Access Network (in-coverage or partial coverage) or outside a Radio Access Network (out-of-coverage) is provided.
  • the first user equipment is configured for obtaining configuration information comprising at least one configuration or pre-configuration of one or more sidelink positioning reference signal resources.
  • the first user equipment is configured for obtaining, from at least one further user equipment, encoded control information, and decoding the encoded control information to obtain decoded control information.
  • the first user equipment is configured for selecting, using the configuration information and the decoded control information, one or more potential transmit resources of the one or more sidelink positioning reference signal resources.
  • the first user equipment is configured for transmitting the sidelink positioning reference signal in one of the one or more potential transmit resources, which have been selected by the first user equipment.
  • the first user equipment may, e.g., be configured for: receiving a trigger for transmitting a sidelink positioning reference signal, wherein the trigger is a configuration message received from another user equipment or is a different kind of trigger signal, (for example, wherein the trigger is an indication on an activation of a deactivation of a sidelink positioning reference signal resource) (for example, wherein the configuration message is provided through higher layers over a sidelink lower layer interface, such as SCI or SL MAC-CE); and/or sensing sidelink control information for user equipments in a monitoring communication range; and/or receiving information on resource pools which are suitable for a sidelink positioning reference signal transmission, and identifying the at least one configuration or pre-configuration on one or more sidelink positioning reference signal resources, and activating a sidelink positioning reference signal depending on the trigger and depending on the at least one configuration or pre-
  • the trigger may, e.g., be provided over a physical channel.
  • the first user equipment may, e.g., be configured to monitor a power level to trigger a re-evaluation or pre-emption for reserved resources.
  • the first user equipment may, e.g., be configured to trigger the re- evaluation or pre-emption for the reserved resources depending on whether the power level being monitored is greater than a threshold value or whether the power level being monitored is smaller than or equal to the threshold value.
  • At least one of the one or more measurement driven priority rules comprises the threshold value.
  • the first user equipment is configured, if a minimum resource pool reuse distance is smaller than a distance between the first user equipment and a road side unit which defines the usage of the resource pool, the first user equipment is configured to be allowed to fully or at least partially reuse a resource pool also used by said one or more other user equipments. According to an embodiment, the first user equipment is configured to obtain one or more priority rules for allocating one or more managed positioning resources.
  • the one or more priority rules prioritize the two or more positioning resources.
  • a second user equipment configured for encoding control information to obtain encoded control information, wherein the control information is suitable for assisting a selection of one or more potential transmit resources of one or more sidelink positioning reference signal resources, wherein the one or more potential transmit resources are suitable for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging out of coverage of a Radio Access Network.
  • the second user equipment is configured for transmitting the encoded control information to a first user equipment.
  • a method for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging within a Radio Access Network (in-coverage or partial coverage) or outside a Radio Access Network (out-of-coverage) comprises:
  • Obtaining configuration information comprising at least one configuration or preconfiguration of one or more sidelink positioning reference signal resources.
  • the method comprises: Encoding control information to obtain encoded control information, wherein the control information is suitable for assisting a selection of one or more potential transmit resources of one or more sidelink positioning reference signal resources, wherein the one or more potential transmit resources are suitable for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging out of coverage of a Radio Access Network. And:
  • Fig. 1 illustrates a system according to an embodiment, which comprises the first user equipment for transmitting a sidelink positioning reference signal according to an embodiment and a second user equipment according to an embodiment.
  • Fig. 2 illustrates a support of SL-PRS in a sidelink mode 2 framework according to an embodiment.
  • Fig. 3a illustrates sidelink positioning in out of coverage involving five user equipments according to an embodiment.
  • Fig. 3b illustrates an embodiment, wherein a user equipment receives assistance data on preferred SL-PRS resources for selection within the resource pool.
  • Fig. 4 illustrates anchor user equipment positioning groups according to an embodiment.
  • Fig. 5 illustrates a wideband SL-PRS using several sub-channels and last symbols of a slot according to an embodiment.
  • Fig. 6 illustrates a possible ranging procedure between a primary user equipment and a secondary user equipment according to an embodiment.
  • Fig. 7 illustrates parallel ranging between a secondary user equipment and several primary user equipments according to an embodiment.
  • Fig. 8 illustrates parallel ranging between a primary user equipment and several secondary user equipments according to an embodiment.
  • Fig. 9 illustrates a grouping of primary user equipments and secondary user equipments according to an embodiment.
  • Fig. 10 illustrates an example according to an embodiment, where a car passes a plurality of road side unit.
  • Fig. 11 illustrates a schematic representation of an example of a terrestrial wireless network.
  • Fig. 12 illustrates an example of a computer system on which units or modules as well as the steps of the methods described in accordance with the inventive approach may execute.
  • Fig. 1 illustrates a first user equipment 110 for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging within a Radio Access Network (in-coverage or partial coverage) or outside a Radio Access Network (out-of-coverage) according to an embodiment according to an embodiment.
  • the first user equipment 110 is configured for obtaining configuration information comprising at least one configuration or pre-configuration of one or more sidelink positioning reference signal resources.
  • the first user equipment 110 is configured for obtaining, from at least one further user equipment 120, encoded control information, and decoding the encoded control information to obtain decoded control information.
  • the first user equipment 110 is configured for selecting, using the configuration information and the decoded control information, one or more potential transmit resources of the one or more sidelink positioning reference signal resources. Moreover, the first user equipment 110 is configured for transmitting the sidelink positioning reference signal in one of the one or more potential transmit resources, which have been selected by the first user equipment 110.
  • the first user equipment 110 may, e.g., be configured for:
  • the trigger may, e.g., be a configuration message received from another user equipment or may, e.g., be a different kind of trigger signal, (for example, wherein the trigger may, e.g., be an indication on an activation of a deactivation of a sidelink positioning reference signal resource) (for example, wherein the configuration message may, e.g., be provided through higher layers over a sidelink lower layer interface, such as SCI or SL MAC-CE); and/or sensing sidelink control information for user equipments in a monitoring communication range; and/or receiving information on resource pools which are suitable for a sidelink positioning reference signal transmission.
  • the trigger may, e.g., be a configuration message received from another user equipment or may, e.g., be a different kind of trigger signal, (for example, wherein the trigger may, e.g., be an indication on an activation of a deactivation of a sidelink positioning reference signal resource) (for example, wherein the configuration message may, e.
  • Activating a sidelink positioning reference signal e.g., depending on the trigger, and depending on the at least one configuration or pre-configuration that has been identified.
  • the first UE may, e.g., receive a trigger, e.g., a bit that is set to a first value (e.g., bit value 1), which indicates a sidelink PRS request.
  • a trigger e.g., a bit that is set to a first value (e.g., bit value 1), which indicates a sidelink PRS request.
  • bit value 1 e.g., bit value 1
  • Such a bit may, for example, be indicated/provided over a physical channel.
  • the first user equipment 110 may, e.g., be configured for:
  • the trigger may, e.g., be a configuration message received from another user equipment or may, e.g., be a different kind of trigger signal.
  • the first user equipment 110 may, e.g., be configured for:
  • Sensing sidelink control information for user equipments in a monitoring communication range Sensing sidelink control information for user equipments in a monitoring communication range.
  • the first user equipment 110 may, e.g., be configured for:
  • the trigger may, e.g., be an indication on an activation of a deactivation of a sidelink positioning reference signal resource.
  • the configuration message may, e.g., be provided through higher layers over a sidelink lower layer interface, such as SCI or SL MAC-CE.
  • the trigger may, e.g., be provided over a physical channel.
  • the trigger may, e.g., be another sidelink positioning reference signal from another user equipment; wherein said other sidelink positioning reference signal may, e.g., be a sidelink positioning reference signal from another user equipment having a desired identifier or may, e.g., be a sidelink positioning reference signal above a threshold.
  • the trigger may, e.g., be a different kind of trigger signal, e.g., semi-persistent transmissions.
  • the first user equipment 110 may, e.g., be configured for:
  • Sensing sidelink control information for user equipments in a monitoring communication range Sensing sidelink control information for user equipments in a monitoring communication range.
  • the first user equipment 110 may, e.g., be configured to establish the connection with the at least one further user equipment by further conducting at least one of:
  • the first user equipment 110 may, e.g., be configured to identify the information about one or more resource pools with an active sidelink positioning reference signal transmission, said information comprising one or more of the following: a supported SL-PRS bandwidth, an allowed sildelink positioning reference signal resource selection mechanism, a dynamic or semi-persistent resource selection, one or more supported operation modes, one or more supported positioning or ranging methods, one or more supported quality of services, a validity area, a priority indication, a usage being one of the following: positioning dedicated; common with communication, a speed, a user equipment type.
  • the first user equipment 110 may, e.g., be configured to monitor a power level to trigger a re-evaluation or pre-emption for reserved resources.
  • the first user equipment 110 may, e.g., be configured to trigger the re-evaluation or pre-emption for the reserved resources depending on whether the power level being monitored is greater than a threshold value or whether the power level being monitored is smaller than or equal to the threshold value.
  • the first user equipment 110 may, e.g., be configured to receive information indicating one or more measurement driven priority rules of reserving indicated resources for a sidelink positioning reference signal transmission and/or one or more measurement driven priority rules of excluding indicated resources from using them for a sidelink positioning reference signal transmission, wherein the one or more measurement driven priority rules depend on a measurement value performed by the first user equipment 110 and/or depend on a distance value related to a range of transmission.
  • the at least one of the one or more measurement driven priority rules comprises the threshold value.
  • the first user equipment 110 may, e.g., be configured to receive information indicating one or more measurement driven priority rules of reserving indicated resources for a sidelink positioning reference signal transmission and/or one or more measurement driven priority rules of excluding indicated resources from using them for a sidelink positioning reference signal transmission, wherein the one or more measurement driven priority rules depend on a measurement value performed by the first user equipment 110 and/or depend on a distance value related to a range of transmission.
  • the first user equipment 110 may, e.g., be configured, if a minimum resource pool reuse distance is smaller than a distance between the first user equipment 110 and a road side unit which defines the usage of the resource pool, the first user equipment 110 may, e.g., be configured to be allowed to fully or at least partially reuse a resource pool also used by said one or more other user equipments.
  • the first user equipment 110 may, e.g., be configured to obtain one or more priority rules for allocating one or more managed positioning resources.
  • the one or more priority rules prioritize the two or more positioning resources.
  • the first user equipment 110 may, e.g., be configured to receive the control information from the at least one further user equipment 120 via at least one sidelink.
  • the first user equipment 110 may, e.g., be configured to transmit a request requesting a transmission of the encoded control information.
  • the first user equipment may, e.g., be configured to transmit the request via at least sidelink to the at least one further user equipment 120.
  • the one or more sidelink positioning reference signal resources are also used by at least another user equipment, being different from the first user equipment, for transmitting one or more further sidelink positioning reference signals.
  • the sidelink positioning reference signal has a sequence being different from a sequence of each of the one or more further sidelink positioning reference signals, wherein the sequences can be differentiated by one or more of the following characteristics
  • the first user equipment 110 may, e.g., be configured to select the one or more potential transmit resources further using one or more evaluations.
  • the first user equipment 110 may, e.g., be configured to receive at least one further sidelink positioning reference signal from the at least one further user equipment 120.
  • the first user equipment 110 may, e.g., be configured to provide information to another user equipment being different from the first user equipment 110, the information being information on a reception of the at least one further sidelink positioning reference signal to the at least one further user equipment 120.
  • the at least one configuration or pre-configuration may, e.g., be provided over a sidelink positioning protocol.
  • the at least one configuration or pre-configuration may, e.g., be provided in an active sidelink positioning protocol session.
  • the at least one pre-configuration may, e.g., be provided over a higher layer interface or over an initial sidelink positioning protocol session.
  • the first user equipment 110 may, e.g., be configured to provide the identified configuration or pre-configuration to a third user equipment by providing the selected configuration to another user equipment, which forwards the selected configuration to the third user equipment.
  • the first user equipment 110 may, e.g., be configured to receive an acknowledgement from the third user equipment confirming a reception of the selected configuration.
  • the first user equipment 110 may, e.g., be configured to provide the identified configuration or pre-configuration to a third user equipment, being different from the first user equipment 110 and being different from the at least one further user equipment 120, so that to enable the third user equipment to perform a measurement on the selected configuration.
  • the first user equipment 110 may, e.g., be configured to receive the configuration information comprising the at least one configuration or pre-configuration of the one or more sidelink positioning reference signal resources within a control channel or via higher layer signalling from the second user equipment 120.
  • the configuration information comprises one or more information elements of the following plurality of information elements: an antenna port identifier, a sequence identifier, information on a chosen transmission comb comprising at least one of a comb value and a comb size and a comb offset, a resource symbol offset indicating a first symbol of a sidelink positioning reference signal within a slot, a reference point defining the location of a point of the sidelink positioning reference signal, one or more suggested resource allocation slots, or a subset of suggested resource allocation slots for the one or more sidelink positioning reference signal resources, a suggested resource allocation comb structure, or a subset of suggested comb structures within a slot for the one or more sidelink positioning reference signal resources, a suggested resource allocation cyclic shift value, or a subset of cyclic shift values for the one or more sidelink positioning reference signal resources, a suggested resource allocation periodicity value, or a subset of periodicity values for the one or more sidelink positioning reference signal resources, an indication for priority resources, which are to be excluded or utilized under
  • the first user equipment 110 may, e.g., be configured to receive two or more reference signals from two or more other user equipments being different from the first user equipment 110.
  • the first user equipment 110 may, e.g., be configured to determine a power value so that the sidelink positioning reference signal to be transmitted by the first user equipment 110 reaches the two or more other user equipments.
  • the first user equipment 110 may, e.g., be configured to transmit the sidelink positioning reference signal depending on the power value that it has determined.
  • the first user equipment 110 exhibits a transmit power control which employs an open loop power control procedure, wherein the open loop power control procedure utilizes an RSRP on a reference signal to determine a transmit power control.
  • the first user equipment 110 may, e.g., be configured to determine a transmit power value for the SL-PRS by performing measurements on a plurality of pre-configured or configured reference signals.
  • the first user equipment 110 may, e.g., be configured to select, as the transmit power value, a value which allows and/or avoids overload on receiver user equipments and which enables a reception by multiple UEs based on the measured reference signals, e.g., with respect to a transmission of the sidelink positioning reference signal by the first user equipment 110.
  • the first user equipment 110 may, e.g., be configured to identify at least one information element of the plurality of information elements, wherein said at least one information element may, e.g., be associated with a sidelink positioning reference signals setting.
  • the first user equipment 110 may, e.g., be configured to complement or to update the configuration or pre-configuration of the one or more sidelink positioning reference signal resources using said at least one information element.
  • the first user equipment 110 may, e.g., be configured to select the one or more potential transmit resources using one or more priority indications provided by other user equipments being different from the first user equipment 110 over a sidelink interface.
  • the one or more priority indications comprise at least one of the following: an indication to exclude one or more slots for reserving sidelink positioning reference signal resources, wherein the priority information indicates, if single or all slots within the multiple slots are to be excluded or reserved according to the priority rules, an indication to exclude sidelink positioning reference signal resources within a slot, wherein the indication indicates the OFDM symbols or resource elements associated with a comb-structure are to be excluded or reserved.
  • the first user equipment 110 may, e.g., be configured to receive priority information comprising one or more rules for performing sidelink positioning reference signal reservation for resources when colliding with sidelink communication resources and/or when a scheduled slot capacity is no longer sufficient for a transmission block.
  • the first user equipment 110 may, e.g., be configured to identify resource elements in selected slots by measuring a control channel and by decoding a priority indication in a sidelink control information message; or wherein the first user equipment 110 may, e.g., be configured to identify and select slots as selected slots and to allocate resource elements within the selected slots by measuring a control channel and by decoding a priority indication in a sidelink control information message.
  • the first user equipment 110 may, e.g., be configured to use priority information related to a sidelink positioning reference signal resource allocation from one or more other user equipments being different from the first user equipment 110 to determine within the selected slots for transmission a subset of symbols and/or resource elements as the one or more potential transmit resources.
  • two or more positioning resources utilize same time and frequency resources and are separated by code and/or by cyclic shift.
  • the user equipment may, e.g., be configured to provide priority information to one or more other user equipments over a sidelink interface.
  • the first user equipment 110 may, e.g., be configured to
  • said information from the one or more other user equipments may, e.g., be control channel information.
  • the first user equipment 110 may, e.g., be configured to measure said at least one reference signal received power of the one or more signals on a subchannel basis, such that the reference signal received power may, e.g., be measured for one or more subchannels of one of the one or more signals.
  • the first user equipment 110 may, e.g., be configured perform sensing and to obtain a comb structure for the reference signal received power being measured; wherein the power relationship between the physical sidelink control channel and the sideling positioning reference signal is fixed or configured, and the first user equipment 110 may, e.g., be configured to measure the reference signal received power and to detect only the physical sidelink control channel part; wherein the first user equipment 110 may, e.g., be configured to employ a correlation technique to conduct reference signal received power sensing.
  • the first user equipment 110 may, e.g., be configured to perform further measurements of one or more further signals transmitted by said one or more other user equipments in a second phase, wherein the user equipment may, e.g., be configured to conduct measuring in the second phase with a higher granularity than in the first phase.
  • the first user equipment 110 may, e.g., be configured to perform further measurements of one or more further signals transmitted by one or more further user equipments in a second phase, wherein the one or more further user equipments are different from said one or more other user equipments.
  • the information from the one or more other user equipments being different from the first user equipment 110 comprises information on a subset of transmit resources of a larger set of transmit resources.
  • the first user equipment 110 may, e.g., be configured to identify the one or more potential transmit resources only from the subset of transmit resources.
  • the first user equipment 110 may, e.g., be configured to repeatedly broadcast or to repeatedly groupcast a resource selection of the first user equipment 110 or resources that are excluded to the one or more other user equipments.
  • the first user equipment 110 may, e.g., be configured to repeatedly broadcast or to repeatedly groupcast the resource selection or the resources that are excluded using a control channel or using higher layer signaling or using a bitmap in a sidelink control channel.
  • the first user equipment 110 may, e.g., be configured to transmit the sidelink positioning reference signal in a dedicated slot for the sidelink positioning reference signal.
  • the first user equipment 110 may, e.g., be configured to transmit the sidelink positioning reference signal in a slot in which the the sidelink positioning reference signal and other information is transmitted.
  • the first user equipment may, e.g., be configured to use one or more parts of the slot only, without using one or more other parts of the slot.
  • the first user equipment 110 may, e.g., be configured to use one of a plurality of subchannels of the slot such that each of the first user equipment 110 and of the at least one other user equipment uses a different subchannel.
  • a particular part of the slot may, e.g., be reserved for one or more sidelink positioning reference signal transmissions.
  • the first user equipment 110 may, e.g., be configured to use a fully available bandwidth of the slot for transmitting the sidelink positioning reference signal.
  • the first user equipment 110 may, e.g., be configured to receive one or more messages from one or more other user equipments being different from the first user equipment 110, the one or more messages depending on a reception of the sidelink positioning reference signal by the one or more other user equipments that has been transmitted by the first user equipment 110.
  • the first user equipment 110 may, e.g., be configured to receive a resource pool configuration from a network entity being different from a user equipment or may, e.g., be configured select a default resource pool allocation.
  • the first user equipment 110 may, e.g., be configured to search for available resources for SL-PRS transmissions and may, e.g., be configured to select a first portion of free resources for transmitting the sidelink positioning reference signal to another user equipment, and may, e.g., be configured to reserve a second portion of the free resources for a transmission of another sidelink positioning reference signal to be transmitted by said other user equipment.
  • the first user equipment 110 may, e.g., be configured to transmit the sidelink positioning reference signal in the first portion to the other user equipment, and may, e.g., be configured to provide information on the second portion of the free resources to the other user equipment. Furthermore, the first user equipment 110 may, e.g., be configured to receive information on a reception of the positioning reference signal by the other user equipment from the other user equipment. Moreover, the first user equipment 110 may, e.g., be configured to receive the other sidelink positioning reference signal in the second portion of the free resources from the other user equipment.
  • the first user equipment 110 may, e.g., be configured to receive a response from each of two or more other user equipments being different from the first user equipment 110, the response from each of the two or more other user equipments being in response to a reception of the sidelink positioning reference signal by the other user equipment that has been transmitted by the first user equipment 110.
  • the two or more other user equipments comprise one or more road side units.
  • the first user equipment 110 may, e.g., be a vehicle entering an area of the two or more other user equipments.
  • the first user equipment 110 may, e.g., be configured to request a response from each of the two or more other user equipments.
  • the first user equipment 110 may, e.g., be configured to transmit the sidelink positioning reference signal together with control information comprising a parameter depending on the sidelink positioning reference signal and/or assistance data or control data to control a resource allocation of a further user equipment 120 receiving the sidelink positioning reference signal.
  • each of one or more further user equipments may, e.g., be transmitting a further sidelink positioning reference signal to at least one other user equipment.
  • the first user equipment 110 may, e.g., be configured to transmit assistance data to the one or more other user equipments which are to receive the sidelink positioning reference signal from the first user equipment 110, wherein the one or more further user equipments also transmit said assistance data or a portion thereof the at least one other user equipment.
  • the first user equipment 110 may, e.g., be configured to sense at least one sidelink positioning reference signal resource. On reception of another sidelink positioning reference signal from another user equipment being different from the first user equipment 110, the first user equipment 110 may, e.g., be configured to transmit a response to said other user equipment comprising information on the reception of said other sidelink positioning reference signal.
  • said other sidelink positioning reference signal from said other user equipment may, e.g., also be received by one or more further user equipments, which transmit a response to said other user equipment responding to a reception of said other sidelink positioning reference signal.
  • the sidelink positioning reference signal transmitted by the first user equipment 110 may, e.g., be suitable for supporting positioning or ranging.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by a higher layer signaling.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by a combination of higher layer signaling and lower layer signaling.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by lower layer signaling.
  • the first user equipment 110 may, e.g., be configured to generate the sidelink positioning reference signal such that it exhibits a staggered or partially staggered pattern or a comb structure.
  • the first user equipment 110 may, e.g., be configured to select new sidelink positioning reference signal resources when it generates a new transmission block.
  • the one or more sidelink positioning reference signal resources comprise at least one of one or more dedicated resource pools and one or more shared resource pools.
  • the first user equipment 110 comprises one or more of the following: a power-limited UE, or a hand-held UE, like a UE used by a pedestrian, and referred to as a Vulnerable Road User, VRU, or a Pedestrian UE, P-UE, or an on-body or hand-held UE used by public safety personnel and first responders, and referred to as Public safety UE, PS-UE, or an loT UE, e.g., a sensor, an actuator or a UE provided in a campus network to carry out repetitive tasks and requiring input from a gateway node at periodic intervals, or a mobile terminal, or a stationary terminal, or a cellular loT-UE, or a SL UE, or a vehicular UE, or a vehicular group leader UE, GL-LIE, or a scheduling UE, S-llE, or an loT or narrowband loT, NB-loT, device, or a ground based vehicle,
  • Fig. 1 also illustrates a second user equipment 120 according to an embodiment.
  • the second user equipment 120 is configured for encoding control information to obtain encoded control information.
  • the control information is suitable for assisting a selection of one or more potential transmit resources of one or more sidelink positioning reference signal resources, wherein the one or more potential transmit resources are suitable for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging out of coverage of a Radio Access Network.
  • the second user equipment 120 is configured for transmitting the encoded control information to a first user equipment 110.
  • the second user equipment 120 may, e.g., be configured to transmit the control information to the first user equipment 110 via a sidelink.
  • the second user equipment 120 may, e.g., be configured to trigger or to activate or to deactivate a pre-configuration for configuring a sidelink positioning reference signal transmission.
  • the second user equipment 120 may, e.g., be configured to trigger or to activate or to deactivate a pre-configuration of two or more pre-configurations for configuring a sidelink positioning reference signal transmission.
  • pre-configuration defines that only a first part of a slot is to be used for other purposes than transmitting sidelink positioning reference signals.
  • the preconfiguration defines that a remaining part of the slot, being the slot without the first part, is to be used for transmitting sidelink positioning reference signals.
  • the pre-configuration defines that only the first part of the slot is to be used for transmitting a physical sidelink control channel or for transmitting a physical sidelink shared channel.
  • the second user equipment 120 may, e.g., be configured to receive a request requesting a transmission of the encoded control information.
  • the second user equipment 120 may, e.g., be configured to transmit the encoded control information to the first user equipment 110 in response to the request.
  • the second user equipment 120 may, e.g., be configured to receive the request via a sidelink from the first user equipment 110.
  • the second user equipment 120 may, e.g., be configured to transmit one or more further sidelink positioning reference signals via the one or more sidelink positioning reference signal resources.
  • the second user equipment 120 may, e.g., be configured to schedule or coordinate positioning resources within a group of user equipments.
  • the second user equipment 120 may, e.g., be configured to transmit at least one further sidelink positioning reference signal to the first user equipment 110, and the second user equipment 120 may, e.g., be configured to receive information on a reception of the at least one further sidelink positioning reference signal from the first user equipment 110.
  • the second user equipment 120 may, e.g., be configured to receive an information request from a third user equipment.
  • the second user equipment 120 may, e.g., be configured to provide information for identifying resources for sidelink positioning reference signal transmissions to the third user equipment.
  • the second user equipment 120 may, e.g., be configured to provide information on a proper subset of available resources for sidelink positioning reference signal transmissions as the information for identifying the resources for sidelink positioning reference signal transmissions to the third user equipment.
  • the pre-configuration defines that the remaining part of the slot may, e.g., be to be used by several user equipments for transmitting two or more positioning reference signals which share the remaining part.
  • the second user equipment 120 may, e.g., be configured to transmit the sidelink positioning reference signal. After a transmission of the sidelink positioning reference signal by the second user equipment 120, the second user equipment 120 may, e.g., be configured to receive one or more messages from one or more other user equipments being different from the second user equipment 120, the one or more messages depending on a reception of the sidelink positioning reference signal by the one or more other user equipments that has been transmitted by the second user equipment 120.
  • the second user equipment 120 may, e.g., be configured to receive a resource pool configuration from a network entity being different from a user equipment or may, e.g., be configured select a default resource pool allocation.
  • the second user equipment 120 may, e.g., be configured to search for available resources for SL-PRS transmissions and may, e.g., be configured to select a first portion of free resources for transmitting the sidelink positioning reference signal to another user equipment, and may, e.g., be configured to reserve a second portion of the free resources for a transmission of another sidelink positioning reference signal to be transmitted by said other user equipment.
  • the second user equipment 120 may, e.g., be configured to transmit the sidelink positioning reference signal in the first portion to the other user equipment, and may, e.g., be configured to provide information on the second portion of the free resources to the other user equipment. Furthermore, the second user equipment 120 may, e.g., be configured to receive information on a reception of the positioning reference signal by the other user equipment from the other user equipment. Moreover, the second user equipment 120 may, e.g., be configured to receive the other sidelink positioning reference signal in the second portion of the free resources from the other user equipment.
  • the second user equipment 120 may, e.g., be configured to receive a response from each of two or more other user equipments being different from the second user equipment 120, the response from each of the two or more other user equipments being in response to a reception of the sidelink positioning reference signal by the other user equipment that has been transmitted by the second user equipment 120.
  • the two or more other user equipments comprise one or more road side units.
  • the second user equipment 120 may, e.g., be a vehicle entering an area of the two or more other user equipments.
  • the second user equipment 120 may, e.g., be configured to request a response from each of the two or more other user equipments.
  • the second user equipment 120 may, e.g., be configured to transmit the sidelink positioning reference signal together with control information comprising a parameter depending on the sidelink positioning reference signal and/or assistance data or control data to control a resource allocation of a further user equipment receiving the sidelink positioning reference signal.
  • each of one or more further user equipments may, e.g., be transmitting a further sidelink positioning reference signal to at least one other user equipment.
  • the second user equipment 120 may, e.g., be configured to transmit assistance data to the one or more other user equipments which are to receive the sidelink positioning reference signal from the second user equipment 120, wherein the one or more further user equipments also transmit said assistance data or a portion thereof the at least one other user equipment.
  • the sidelink positioning reference signal transmitted by the second user equipment 120 may, e.g., be suitable for supporting positioning or ranging.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by a higher layer signaling.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by a combination of higher layer signaling and lower layer signaling.
  • the sidelink positioning reference signal resources are activated, deactivated or triggered by lower layer signaling.
  • the second user equipment 120 may, e.g., be configured to generate the sidelink positioning reference signal such that it exhibits a staggered or partially staggered pattern and/or a comb structure; and/or
  • the second user equipment 120 may, e.g., be configured to select new sidelink positioning reference signal resources when it generates a new transmission block.
  • the one or more sidelink positioning reference signal resources comprise at least one of one or more dedicated resource pools and one or more shared resource pools.
  • the second user equipment 120 comprises one or more of the following: a power-limited UE, or a hand-held UE, like a UE used by a pedestrian, and referred to as a Vulnerable Road User, VRU, or a Pedestrian UE, P-UE, or an on-body or hand-held UE used by public safety personnel and first responders, and referred to as Public safety UE, PS-UE, or an loT UE, e.g., a sensor, an actuator or a UE provided in a campus network to carry out repetitive tasks and requiring input from a gateway node at periodic intervals, or a mobile terminal, or a stationary terminal, or a cellular loT-UE, or a SL UE, or a vehicular UE, or a vehicular group leader UE, GL-UE, or a scheduling UE, S-UE, or an loT or narrowband loT, NB-loT, device, or a ground based vehicle, or an aerial
  • the first user equipment 110 may, e.g., be also a second user equipment 120 according to one of the previously described embodiments.
  • the first user equipment 110 and the second user equipment 120 of Fig. 1 form a system according to an embodiment.
  • the system comprises the first user equipment 110 according to one of the above-described embodiments and the second user equipment 120 according to one of the above-described embodiments.
  • the first user equipment 110 is configured to obtain configuration information comprising at least one configuration or pre-configuration of one or more sidelink positioning reference signal resources.
  • the second user equipment 120 is configured to encode control information to obtain encoded control information, wherein the control information is suitable for assisting a selection of one or more potential transmit resources of the one or more sidelink positioning reference signal resources, wherein the one or more potential transmit resources are suitable for transmitting a sidelink positioning reference signal for supporting or conducting positioning or ranging out of coverage of a Radio Access Network.
  • the second user equipment 120 is configured to transmit the encoded control information to the first user equipment 110.
  • the first user equipment 110 is configured to obtain, from the second user equipment 120, the encoded control information, and is configured to decode the encoded control information to obtain decoded control information.
  • the first user equipment 110 is configured to select, using the configuration information and the decoded control information, one or more potential transmit resources of the one or more sidelink positioning reference signal resources.
  • the first user equipment 110 is configured to transmit the sidelink positioning reference signal in one of the one or more potential transmit resources, which have been selected by the first user equipment 110.
  • a set of UEs may be coordinate the resource allocation.
  • a set of UEs may be road side units (RSUs) in a given area, for example.
  • RSUs road side units
  • the new UE gets the resource allocation by receiving information from any member of the group or at least information on resources the UE can select randomly
  • Target UE UE to be positioned (in this context, using SL, i.e. PC5 interface).
  • Sidelink positioning Positioning UE using reference signals transmitted over SL, i.e., PC5 interface, to obtain absolute position, relative position, or ranging information.
  • Ranging determination of the distance and/or the direction between a UE and another entity, e.g., anchor UE.
  • S PRS Sidelink positioning reference signal
  • SL PRS (pre-)configuration (pre-) configured parameters of SL PRS such as timefrequency resources (other parameters are not precluded) including its bandwidth and periodicity.
  • Anchor UE UE supporting positioning of target UE, e.g., by transmitting and/or receiving reference signals for positioning, providing positioning-related information, etc., over the SL interface.
  • SL resource pool A set of resources (pre-)configured for SL use. Several UEs may share this resource pool using access procedures defined by the standard.
  • the resource pool is a subset of the resources of a carrier or all resources of a carrier are (pre-)configured for SL use (carrier is not managed by a network).
  • a carrier may include several (pre-)configured resource pools.
  • Anchor UE UE supporting positioning of target UE, e.g., by transmitting and/or receiving reference signals for positioning, providing positioning-related information, etc., over the SL interface.
  • a UE may be connected to the network using another carrier. Over this carrier the UE may receive assistance data or this carrier may be used for synchronization (e.g., synchronization of the “time” (framing))
  • a method for selecting transmit resources for a sidelink positioning reference signal (SL-PRS) performed by a UE (UE5) out of coverage over a sidelink interface comprising:
  • 104 - transmit the SL-PRS on one of the selected resources A method performed by a UE (UE1) for assisting other UEs in out of coverage, over a sidelink interface, in selecting transmit resources for a sidelink positioning reference signal (SL-PRS) performed by a UE (UE5).
  • UE1 UE1
  • SL-PRS sidelink positioning reference signal
  • Fig. 2 illustrates a support of SL-PRS in a sidelink mode 2 framework according to an embodiment.
  • At least one of the UE(s) participating in the sidelink positioning operation allocates resources for SL-PRS
  • Fig. 3a illustrates sidelink positioning in out of coverage involving five user equipments according to an embodiment.
  • UE5 wants to find the SL-PRS configuration a transmit pools.
  • UE1 , UE2, and UE3 are transmitting their SL-PRS resources within the same resource pool.
  • UE4 is utilizing a different resource pool for its SL-PRS.
  • Fig. 3a shows an example for UE5 intending an SL-PRS transmission.
  • UE5 performs legacy procedure to establish a connection with at least one UE (such as UE1).
  • UE5 can for this purpose, perform the following: sensing associated with decoding the first stage SCI for UEs in the monitoring communication range (see 102 above);
  • Request from at least one second UE, information about one or more resource pools for an active or managed for SL-PRS transmission
  • ⁇ SL-PRS allowed resource selection mechanism full sensing only, partial sensing only, random resource selection only, or any combination ⁇ dynmaic or semi-persistent resource selection
  • ⁇ UE type e.g., lead or member of a platoon
  • o Information can be received from control channel or higher layer signaling of/through the identified other UE
  • Identify on at least one configuration or pre-configuration on one or more SL-PRS resource(s) (see 101 above); o Information can be received from control channel or higher layer signaling of/through the identified other UE; information about one or more resource pools for an active or managed for SL-PRS transmission; information can include one or more of the following:
  • the choice of the transmission comb includes a comb value or comb size.
  • the comb value is selected from a list supported by the UE and value indutes the frequency resource allocation within an OFDM symbol.
  • anchor Provide selected configuration to the other UE (anchor) so that to enable the other UEs (example UE2) within the positioning range to perform a measurement on the selected configuration without the need to establish a communication link and reduce sensing overhead o
  • Other UE forward the information to the one or more (anchor) UEs o UE5 receives an acknowledgment on the reception of the SL-PRS configuration
  • information on at least one configuration or pre-configuration on a SL-PRS resource may, e.g., be identified.
  • the selection (by UE5) of the one or more SL-PRS resources reservation for transmission comprises priority indications provided from other UE(s) over the sidelink interface.
  • the UE Prior to this step, the UE monitors one or more messages indicating a sidelink resource reservation or/and receives higher information providing the indication or/and monitors channel measurements on these or subset of these resources.
  • the UE receives an indication, for priority resources, to exclude slot(s) for reserving the SL- PRS resources.
  • the priority information indicates if single or all slots within the multiple slots are to be excluded or reserved according to the priority rules.
  • the UE receives an indication, for priority resources, to exclude SL-PRS resources within a slot.
  • the priority information indicates the OFDM symbols or resource elements associated with a comb-structure are to be excluded or reserved.
  • the priority information provides rules for performing SL-PRS reservation for resources when colliding with sidelink communication resources.
  • the UE is expected to exclude the communication resources from reservations.
  • the priority rule can inform a SL communication UE to exclude certain slots or/and certain symbols within a slot from transmission for SL-PRS transmission.
  • a UE can identify the slots by measuring the control channel and decoding the priority indication in the SCI message. In a later step, the UE uses the priority information related to the SL-PRS allocation from other devices to determine within the selected slots for transmission SL PRS resources on a subset of symbols and/or resource elements within the slot.
  • the UE can further receive information, the information indicating measurement driven priority rules of reserving indicated resources for SL-PRS transmission.
  • the information associates the priority information with a measurement value performed by the UE or a distance value related to the range of transmission.
  • the UE may perform an RSRP measurement or sense the subchannel power to determine according to the priority rules if these resources can be used.
  • the UE can be further configured to monitor the power level to trigger a re-evaluation or pre-emption for the reserved resources.
  • the priority information can provide a threshold value allowing to reserve or exclude a certain resource.
  • the UEs may share the same resources using code multiplex or different cyclic shifts, for example.
  • the UE is allowed full or partial resource pool reuse between certain UEs. If the sharing may cause strong interference the UE may search for alternative resources. For example, if a UE needs to re-evaluate its resources and identify new resources to use, the anchor UE can monitor its resource pool and compare with the resource pools of the adjacent anchor UEs sharing the same resource pool in order to identify unused resources in all resource pools to avoid high interference.
  • the UE may receive from one or more UEs or from a pre-configuration information related to priority resource assignments.
  • resource assignment configuration can be associated with certain UEs (for example RSU, these can for example be RSUs/Anchor UE (UE1 and UE2).
  • Other UEs may be allowed to select resources for its SL PRS transmission under the condition that the priority rules related with the managed positioning resources are met.
  • SL-PRS resources within a managed positioning resource can utilize the same frequency resources.
  • the solution allows UEs to be better coordinated by improving the time-frequency utilization. This is achieved by allowing certain SL-PRS resources to be separated by code or by cyclic shift conditioned that noncoordinated UEs will not interfere/transmit on these resources according to the priority rules.
  • the channel characteristics can allow multiple RSUs to use the same resources and be separated cyclic shift.
  • Other mobile UEs in this example shall avoid transmitting on the coordinated SL-PRS resources.
  • One realization is to indicate high priority SL-PRS resources, and/or OFDM symbols reserved for certain UEs.
  • a different realization is that resources are implicitly excluded by a target UE such that the UE received assistance on SL-PRS transmission if certain UEs (ex. RSUs, Anchor UEs).
  • the UE will exclude SL-PRS reservation on these resources within a validity area regardless of the monitoring status.
  • the procedure permits long-term sensing and resource selection for UEs transmitting periodically or with high priority (e.g., RSUs) in order to avoid transmissions on resources reserved by other UEs for aperiodic transmission
  • a UE provides priority information of the one or more SL-PRS resources reservation for transmission.
  • the information comprises priority indications provided to the other UE(s) over the sidelink interface.
  • resource allocation according to an embodiment is described, in particular, full sensing, coordinated selection, pre-configuration or random selection.
  • a UE decodes other UEs control channel information and measures the corresponding received power (RSRP) in a first sensing phase.
  • the UE identifies potential RPs for SL- PRS future transmissions; wherein the UE identified candidate resources have a granularity of at least one slot in the time domain.
  • Resource allocation, sensing, and resource selection are performed in units of a sub-channel, although it is possible that a small number of PRBs within a sub-channel are not used for transmission.
  • the UE receives an indication or selects one of the following options if no indication is receiving: on a random allocation within pre-configured OFDM symbols within the slot of the pre-configured resource pools; or
  • the UE may select [or switch between] any resource allocation option among the ones listed above depending on the conditions.
  • the target UE(2) can reserve resources for retransmission of SL-PRS if no feedback is received within a certain time window; o If a retransmission of the SL-PRS is necessary, these resources are used, o Otherwise, they are released and other UEs can use them.
  • the sensing may be performed on subchannel basis.
  • the resources may be allocated on sub-channel basis.
  • the sensing is also performed on sub-channel basis (either measurement of the RSRP per subchannel or decoding of the SCI of all subchannels with sufficient RSRP) .
  • UE measures the RSRP, and detects the PSCCH part only and the power relationship between PSCCH and SL-PRS is fixed or configured.
  • RSRP sensing can be performed on the PSCCH and SL-PRS and the value are combined to a common RSRP indicator.
  • the RSRP sensing supports also very low SINR (e.g., correlation techniques are assumed for RSRP measurements).
  • the SL-PRS is sensed by decoding the SCI and the SCI uses a higher PSD (power spectral density) to ensure a higher effective SINR for the RE used by the SCI.
  • PSD power spectral density
  • the UE is expected to perform a second sensing phase to select candidate resource for the SL-PRS transmissions.
  • the second phase depends on the first select in the first phase.
  • the second phase provides a higher granularity sensing on an OFDM symbols within the slot(s) identified in the first phase.
  • the UE in the second phase may monitor SL-PRS resource from other UEs.
  • the UE is not expected to monitor additional channel information from the other UEs, not associated with the sensing, performed or measurements from the UE in the first phase.
  • the UE might sense information on a subset of resources suggested in the first phase from the other UE.
  • the UE monitors the candidate resources from the subset of the resources and selects the transmission resources or triggers a re- evaluation depending on the sensing information.
  • Fig. 3b shows an example scenario for this procedure: UE5 receives a subset of possible resources from UE1. If the higher layer requests the UE(UE5) to determine a subset of resources from which the higher layer will select resources for SL-PRS transmission as part of sensing procedure, the higher layer (via UE1) provides a set of resources which may be subject to re-evaluation and a set of resources which may be subject to pre-emption.
  • Fig. 3b illustrates an embodiment, wherein UE5 receives Assistance Data on preferred SL-PRS resources for selection within the RP pool. UE5 sense if these resources interferes with UEs outside the sensing range of the UEs in the group. UE5 can sense a SL-PRS transmission even if it did not decode the control information from UE2.
  • the UE can broadcast periodically its resource selection to the other UEs so that they can reselect their resources based on sensing of the available resources of the total resource pool. This can be done by means of
  • SL-PRS and other information can be transmitted (see Figure 5) o
  • the UEs use parts of a slot only (e.g., the first N OFDM symbols) o If several UEs transmit in the same slot, each UE may use a different subchannel o The remaining part of the slot is reserved for SL-PRS transmissions. o
  • a SL-PRS typically uses the full bandwidth available for the RP (yellow area in the figure)
  • An anchor UE can coordinate with a second or more anchor UEs (UE2).
  • Each anchor UE can be able for scheduling/coordinating positioning resources within a group.
  • the positioning resources are reserved per anchor UE or per group.
  • the two or more anchor UEs can coordinate belong to the same positioning group.
  • positioning groups are coordinated separately (by the network, for example).
  • the target UE requiring a SL-PRS transmission requires to decode the information from one anchor UE in the group.
  • the target UE receives assistance to identify the resources for SL-PRS transmission.
  • the target UE can receive information related to SL-PRS sequence comprising at least comb factor or/and frequency offset or/and OFDM symbols indication or/and a slot offset indication.
  • the target UE uses these information to generate the SL-PRS and inform an Anchor UE on the SL- PRS configuration including the sequence ID and information on the frequency time allocation if this information differs from the information provided by the anchor.
  • the SL-PRS configuration can be reduced to a selected subset of SL-PRS configurations which can be provided to target UE.
  • the subset includes pre-selected resources assignments on different OFDM symbols, and/or Comb offsets or further related assistance data.
  • the packet size is reduced for exchanging the AD, and the target UE provides SL-PRS UE specific information and the configuration ID or a confirmation on the configured SL-PRS information.
  • Fig. 4 illustrates Anchor UE positioning groups according to an embodiment: Group 1 (UE1 ,2,6,7) and Group 2 (UE4,7,8,9) central coordinate positioning resources. Coordinated resource allocation between Group 1 and Group 2 may be considered.
  • the anchor UEs are configured to coordinate positioning resources. Coordination can occur via a different entity, or direct sidelink communication.
  • the anchor UEs coordination can enable adjust the resources for changes, such as the number of UEs in the group.
  • UE1 can for example request utilizing resources coordinated or reserved by UE4 for positioning transmission.
  • Another example enables to adjust the resources for temporary resource allocation or handover preparation.
  • a set of vehicles is considered as group. Another vehicle may want to become a member of the platoon and allocates its resources according to the information received from at least one member of the platoon.
  • a pre-configuration associated with a validity ID such as zone ID or multiple preconfiguration which can be triggered or activated or deactivated by an Anchor UE.
  • Bundle the SL-PRS with TBs (transport block) for communication The TB may be transmitted in the physical channel PSSCH.
  • the TBs may use only use the first part of a slot (and subchannel).
  • the remaining OFDM symbols can be reserved for SL-PRS transmissions. Assuming several subchannels are used and each UE may selects a different subchannel all UEs using the slot should use only the first OFDM symbols for PSCCH and PSSCH.
  • the remaining OFDM symbols are assigned for wideband SL-PRS transmissions, wherein several UEs share the resources [COMB multiplex, optional combined with other sharing concepts like code multiplex or different cyclic shifts]. The principle is depicted in Fig. 5.
  • Fig. 5 illustrates a wideband SL-PRS using several sub-channels and last symbols of a slot according to an embodiment:
  • the UE In the sensing window (first phase) the UE detects the allocation and periodicity of allocated TBs, detects free slots per subchannels and reserves the free resources for future transmissions.
  • the direction of the signal is defined by the signal type.
  • the gNB is the transmitter and the UE the receiver, for example.
  • a UE For SL based solutions a UE must know if it shall receive the signal transmitted in this slot or it can be a transmitter in the slot. Accordingly, the UE must decide (or will be configured) for which slots it looks for free resources for transmission and for which slots the UE shall act as a receiver. For RTT based positioning applications a signal is transmitted in two directions. An example is:
  • a first device transmits a first signal (e.g., a SL-PRS with or without related control information).
  • a first signal e.g., a SL-PRS with or without related control information.
  • a second device receives this signal and sends back a response
  • the P_UE may perform initial sensing of the free resources and may reserve the resources for the P_UE(s) and S_UE(s).
  • An anchor UE performing this functionality is considered as a P UE.
  • the P_UE may transmit together with the SCI for the allocation of the resources for the current and future (P-)SL-PRS transmissions of the P_UE and AD (assistance data) for the selection of the resources by the S_UE(s).
  • the S_UE(s) may configure the (S-)SL_PRS) transmissions using the AD.
  • the S_UE(s) may perform a complementary sensing.
  • a pair of UEs performs independent measurements.
  • One UE of the pair becomes the P_UE and the other UE of the pair the S_UE.
  • the pairs may perform the measurements sequential (using different slots of OFDM symbols) or in parallel by sharing the time/frequency resources
  • the S_UE(s) may be triggered by control signals associated to the P-SL-PRS or may sense P-SL-PRS transmissions and may react on the P-SL-PRS with a S-SL-PRS transmission.
  • the S_UEs perform measurements on the received signals (TDOA measurements, for example) and send back o Only measurements (TDOA method) o SL-PRS and measurements.
  • a P_UE requests responses from several devices.
  • the P_UE transmits a first signal, which may be received by several S_UEs.
  • the P_UE may use a group cast message to select the related S_UEs or the S_UEs are selected by the AD associated with the P-SL-PRS or by other means.
  • the S_UEs are triggered.
  • Several S_UEs send back a SL-PRS which is received by the P_UE.
  • the signals transmitted by the S_UEs can be distinguished using different sequence parameters.
  • the sequence parameters or parts of it may be (pre-)configured and/or derived from the SL-PRS transmitted by the P_UE and/or related control information.
  • each UE can have 4 states
  • the UE may transmit a SL-PRS together with control information.
  • the control information may define the parameter selected for the SL-PRS and further AD or control data to control the resource allocation of the S_UE
  • the UE decodes the control information associated with the SL-PRS and performs measurements
  • Each UE can become a P_UE or a S_UE.
  • a UE can be configured over higher layer signaling to be a P_UE.
  • a UE can decide to become a P_UE.
  • a P_UE functionality can be subject to UE capability.
  • the resource pool management may define for which slot the UE is in receive mode or transmit mode .
  • Fig. 6 illustrates a possible ranging procedure between P_UE and S_UE (example RTT) according to an embodiment.
  • the resource pool configuration is provided by the network or a default resource pool allocation is selected
  • the UEs Before starting a ranging procedure the UEs may have already exchanged some information. This may include UE identification information, capability information or information required to encrypt data exchanged between UEs
  • P_UE search (sense) available resources for the SL-PRS transmissions and selects free resources.
  • the P-llE may reserve or (pre-)allocate resources for the SL-PRS transmitted by the S_SU (“S-SL-PRS”).
  • This reservation or (pre-)allocation information is provided by the P_UE to the S_UE as AD (transmitted within the PSSCH area, for example) or control data (e.g., additional data fields in SCI2).
  • the S_UE may rely on this AD or may perform complementary sensing for free resources
  • the S_UE configures the transmits a (S-)SL-PRS
  • the S_UE may report measurements.
  • the report may be included in the same slot used for the (S-)SL-PRS (e.g., in the PSSCH area of the slot including a SL-PRS) or in another slot
  • P UE Primary UE
  • S UE secondary UE
  • pre-allocation preferred resources
  • the signals may use different resources elements of a slot (different COMB offset or different OFDM symbol) or may even use the same REs and distinguished by different sequence IDs (Code multiplex) or different cyclic shifts.
  • Fig. 7 illustrates parallel ranging between S_UE and several P_UE, Positioning (e.g., P_UEs act as anchor) according to an embodiment.
  • P_UEs of the group coordinate the resources and configuration for the P-SL-PRS transmissions to allow a separation of the signals, even if the UEs use the same resources.
  • the P_UE can exchange sensing information.
  • the scenario is applicable to
  • Each P_UE transmits allocation information and SL-PRS configuration information of all P-SL-PRSs related to the group
  • the S_UEs may respond with a constant (effective) delay and may transmit a S-SL-PRS only
  • Fig.8 illustrates parallel ranging between a P_UE and several S_UE, Positioning (e.g., S_UEs act as anchor) according to an embodiment.
  • a P_UE may reserve/pre-allocate the resources and the SL-PRS sequence parameters for a group of S_UE.
  • the S_UEs may act as anchors for positioning. Possible application examples are:
  • the S_UEs are RSUs
  • the P_UE is a vehicle entering the area of the S_UEs •
  • the P_UE requests responses from several S_UEs
  • a report free RTT method (e.g., the S_UEs transmit the S-SL-PRS only) may be attractive in this scenario
  • the S_UEs may respond with a constant (effective) delay and may transmit a S-SL-PRS only
  • Fig. 9 illustrates a grouping of P_UE and S_UE according to an embodiment.
  • a S_UE responds to a group of P_UE, wherein each S_UE responds with a group- east message to the group of P_UE, for example
  • N P_UE triggers for a group of S_UEs to respond. This results that for N P_UEs and M S_UEs N*M responses are generated.
  • the N*M responses may be multiplexed to the same slot.
  • a possible embodiment is: o Using COMB and/or TIME multiplex N responses can be distinguished in the time-frequency domain o
  • the M S_UEs are distinguished by Code multiplex or different Cyclic shifts
  • Each pair of P_UE and S_UE may perform independent RTT measurements, but several pairs may share the same slot using different resources of a slot (e.g., COMB or TIME multiplex)
  • a slot e.g., COMB or TIME multiplex
  • a group of S_UE may respond to each P_UE individually.
  • the resource allocation for the S_UE is derived from the P_UE allocation (e.g., same COMB offset and same OFDM symbol offset in slot), the S_UEs are separated by different cyclic shifts or code multiplex)
  • the P_UE may use cyclic shift or code multiplex and the S_UE are separated by COMB multiplex or time multiplex
  • the resource allocation scheme in mode 2 enables SL measurements to support positioning RTT-type solutions including single-sided RTT or double-sided RTT.
  • RTT-type solutions including single-sided RTT or double-sided RTT.
  • double sided RTT at least two SL-PRS should be transmitted from the same device and enabled by the resource allocation provided solution.
  • the resource allocation scheme in mode 2 enables SL measurements to support SL-TDoA, AL-AoA or SL-AoD solutions.
  • SL-TDoA the SL-PRS resources are pre-configured according to the resource allocation coordinated solution.
  • the SL-PRS resources in mode 2 is configured, activated, deactivated or triggered from a higher layer signaling received from other UEs.
  • the low layer signaling do not play a role in activation or triggering a pre-configured SL PRS.
  • the low-layer signaling includes the physical layer channel such as SL-MAC-CE, or DCI, or first stage SCI or second stage SCI.
  • the SL-PRS resources in mode 2 is configured, activated, deactivated or triggered by a combination of higher layer signaling received and lower layer signaling from other UEs. In this case, the low layer signaling are used to trigger, initiate or request and update a SL-PRS signaling as well as for the sensing procedure.
  • the SL-PRS resources in mode 2 is configured, activated, deactivated or triggered by low layer signaling received from other UEs.
  • Partially staggered SL-PRS pattern e.g., M symbol(s) of SL-PRS with comb-N, with M ⁇ N, at each symbol a different RE offset is used).
  • SL-PRS patterns e.g., M symbol(s) of SL-PRS with comb- N, at each symbol a same RE offset is used, N > 1).
  • the Comb-structure will allow to effectively, within the same slot, multiple UEs can be allocated to the share one or more OFDM symbols.
  • a coordinating UE such as an Anchor UE, can manage in mode the SL-PRS so that two or more UEs uses different RE offset pattern or different non-colliding Comb-N relations.
  • mode 2 in SL communication defines on-demand (aperiodic) or semi-persistent resource selection in mode 2.
  • Aperiodic selects new resources for each transmission block (TB).
  • Semi-persistent, select resources for a number of consecutive TBs which are enabled or disabled in a RP pre-configuration.
  • a UE can select new SL resources when it generates a new TB.
  • a new selection can also be triggered (only for the semi-persistent scheme) because a new TB does not fit in the previously reserved resources.
  • SL-PRS resource allocation can support dedicated resource pool for SL-PRS.
  • Dedicated resource pool is defined by one or more of: SL frame structure, SL positioning slot structure, multiplexing of SL-PRS with control information (if included in the same slot).
  • the resource pool can be shared between sidelink communication and SL-PRS.
  • Fig. 10 illustrates an example according to an embodiment, where a car passes a plurality of road side units (RSUs) .
  • RSUs road side units
  • RSUs in an area in the example a “road segment” coordinate its configuration and may share a set of resources
  • RSUs in the next road segment may use a different set of resources (e.g., different COMB-offset or different slots)
  • the car detects resources allowed for SL-PRS transmission and selects randomly a set of resources. Transmitting together with the SL-PRS a PSCCH the other UEs can detect which resources are allocated o For RTT like operation modes the RSUs transmit also SL-PRS.
  • the SL-PRS configuration of the car may be derived directly from the SL-PRS configuration of the RSUs o
  • the car requests the allocation from one member of the group.
  • the group may exchange information about the allocated resources.
  • aspects of the described concept have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or a device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus.
  • Various elements and features of the present invention may be implemented in hardware using analog and/or digital circuits, in software, through the execution of instructions by one or more general purpose or special-purpose processors, or as a combination of hardware and software.
  • embodiments of the present invention may be implemented in the environment of a computer system or another processing system.
  • Fig. 12 illustrates an example of a computer system 600.
  • the units or modules as well as the steps of the methods performed by these units may execute on one or more computer systems 600.
  • the computer system 600 includes one or more processors 602, like a special purpose or a general-purpose digital signal processor.
  • the processor 602 is connected to a communication infrastructure 604, like a bus or a network.
  • the computer system 600 includes a main memory 606, e.g., a random-access memory, RAM, and a secondary memory 608, e.g., a hard disk drive and/or a removable storage drive.
  • the secondary memory 608 may allow computer programs or other instructions to be loaded into the computer system 600.
  • the computer system 600 may further include a communications interface 610 to allow software and data to be transferred between computer system 600 and external devices.
  • the communication may be in the from electronic, electromagnetic, optical, or other signals capable of being handled by a communications interface.
  • the communication may use a wire or a cable, fiber optics, a phone line, a cellular phone link, an RF link and other communications channels 612.
  • computer program medium and “computer readable medium” are used to generally refer to tangible storage media such as removable storage units or a hard disk installed in a hard disk drive. These computer program products are means for providing software to the computer system 600.
  • the computer programs also referred to as computer control logic, are stored in main memory 606 and/or secondary memory 608. Computer programs may also be received via the communications interface 610.
  • the computer program when executed, enables the computer system 600 to implement the present invention.
  • the computer program when executed, enables processor 602 to implement the processes of the present invention, such as any of the methods described herein. Accordingly, such a computer program may represent a controller of the computer system 600.
  • the software may be stored in a computer program product and loaded into computer system 600 using a removable storage drive, an interface, like communications interface 610.
  • the implementation in hardware or in software may be performed using a digital storage medium, for example cloud storage, a floppy disk, a DVD, a Blue-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate or are capable of cooperating with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
  • Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
  • embodiments of the present invention may be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer.
  • the program code may for example be stored on a machine readable carrier.
  • inventions comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier.
  • an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.
  • a further embodiment of the inventive methods is, therefore, a data carrier or a digital storage medium, or a computer-readable medium comprising, recorded thereon, the computer program for performing one of the methods described herein.
  • a further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet.
  • a further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein.
  • a further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.
  • a programmable logic device for example a field programmable gate array, may be used to perform some or all of the functionalities of the methods described herein.
  • a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein.
  • the methods are preferably performed by any hardware apparatus.

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Abstract

L'invention concerne un premier équipement utilisateur (110) destiné à transmettre un signal de référence de positionnement de liaison latérale pour prendre en charge ou effectuer un positionnement ou une télémétrie à l'intérieur d'un réseau d'accès radio (en couverture ou en couverture partielle) ou à l'extérieur d'un réseau d'accès radio (hors couverture) selon un mode de réalisation est décrit. Le premier équipement utilisateur est configuré pour obtenir des informations de configuration comprenant au moins une configuration ou une pré-configuration d'une ou plusieurs ressources de signal de référence de positionnement de liaison latérale. De plus, le premier équipement utilisateur est configuré pour obtenir, à partir d'au moins un autre équipement utilisateur (120), des informations de commande codées, et décoder les informations de commande codées pour obtenir des informations de commande décodées. En outre, le premier équipement utilisateur est configuré pour sélectionner, à l'aide des informations de configuration et des informations de commande décodées, une ou plusieurs ressources de transmission potentielles de la ou des ressources de signal de référence de positionnement de liaison latérale. De plus, le premier équipement utilisateur est configuré pour transmettre le signal de référence de positionnement de liaison latérale dans l'une de la ou des ressources de transmission potentielles, qui ont été sélectionnées par le premier équipement utilisateur.
PCT/EP2024/053877 2023-02-17 2024-02-15 Attribution de ressources de signal de référence de positionnement de liaison latérale d'équipement utilisateur Ceased WO2024170688A1 (fr)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SHINYA KUMAGAI ET AL: "Discussion on potential solutions for SL positioning", vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), XP052222552, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/TSG_RAN/WG1_RL1/TSGR1_111/Docs/R1-2211988.zip R1-2211988_DCM_SL-pos solutions_fin.docx> [retrieved on 20221107] *
XUEMING PAN ET AL: "Discussion on potential solutions for sidelink positioning", vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), XP052221577, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/TSG_RAN/WG1_RL1/TSGR1_111/Docs/R1-2211012.zip R1-2211012 Discussion on potential solutions for sidelink positioning-final.docx> [retrieved on 20221107] *

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