WO2024031408A1 - Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence - Google Patents

Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence Download PDF

Info

Publication number
WO2024031408A1
WO2024031408A1 PCT/CN2022/111335 CN2022111335W WO2024031408A1 WO 2024031408 A1 WO2024031408 A1 WO 2024031408A1 CN 2022111335 W CN2022111335 W CN 2022111335W WO 2024031408 A1 WO2024031408 A1 WO 2024031408A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
listen before
before talk
talk procedure
sidelink
Prior art date
Application number
PCT/CN2022/111335
Other languages
English (en)
Inventor
Yong Liu
Diomidis Michalopoulos
Taylan SAHIN
Torsten WILDSCHEK
Stepan Kucera
Renato Barbosa ABREU
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2022/111335 priority Critical patent/WO2024031408A1/fr
Publication of WO2024031408A1 publication Critical patent/WO2024031408A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • Various exemplary embodiments described herein generally relate to communication technologies, and more particularly, to devices, methods, apparatuses and computer readable media supporting efficient positioning reference signal (PRS) detection for sidelink positioning in an unlicensed spectrum.
  • PRS positioning reference signal
  • example embodiments of the present disclosure provide a solution of efficient positioning reference signal detection for sidelink positioning in an unlicensed spectrum.
  • the first terminal device may comprise at least one processor and at least one memory storing instructions.
  • the instructions when executed by the at least one processor, may cause the first terminal device at least to initiate a first listen before talk procedure before transmitting a sidelink positioning reference signal to a second terminal device in the radio access network in an unlicensed spectrum during a sidelink positioning session, transmit positioning related control information to the second terminal device in a licensed spectrum, and transmit the sidelink positioning reference signal in the unlicensed spectrum in response to the first listen before talk procedure initiated by the first terminal device ending successfully.
  • the positioning related control information may comprise an indication for the second terminal device to receive a notification of whether the first listen before talk procedure initiated by the first terminal device is successful or to perform a second listen before talk procedure.
  • an example embodiment of a second terminal device in a radio access network may comprise at least one processor and at least one memory storing instructions.
  • the instructions when executed by the at least one processor, may cause the second terminal device at least to receive positioning related control information from a first terminal device in the radio access network over sidelink in a licensed spectrum, and perform sidelink positioning reference signal detection in an unlicensed spectrum at a timing determined based on the positioning related control information.
  • the positioning related control information may comprise an indication for the second terminal device to receive a notification of whether a first listen before talk procedure initiated by the first terminal device is successful or to perform a second listen before talk procedure.
  • Example embodiments of methods, apparatuses, and computer readable media are also provided. Such example embodiments generally correspond to the above example embodiments of the devices, and a repetitive description thereof is omitted here for convenience.
  • Fig. 1 is a schematic diagram illustrating a communication network in which example embodiments of the present disclosure can be implemented.
  • Fig. 2A is a schematic diagram illustrating a channel occupancy time duration obtained through a listen before talk procedure.
  • Fig. 2B is a schematic flowchart illustrating a Type 1 listen before talk procedure.
  • Fig. 3 is a schematic message flowchart illustrating sidelink communications between multiple user equipments.
  • Fig. 4 is a schematic message flowchart illustrating a process according to an example embodiment of the present disclosure.
  • Fig. 5 is a schematic block diagram illustrating an apparatus according to an example embodiment of the present disclosure.
  • Fig. 6 is a schematic block diagram illustrating an apparatus according to an example embodiment of the present disclosure.
  • Fig. 7 is a schematic block diagram illustrating a device according to an example embodiment of the present disclosure.
  • the term “network device” refers to any suitable entities or devices that can provide cells or coverage, through which the terminal device can access the network or receive services.
  • the network device may be commonly referred to as a base station.
  • the term “base station” used herein can represent a node B (NodeB or NB) , an evolved node B (eNodeB or eNB) , or a gNB.
  • the base station may be embodied as a macro base station, a relay node, or a low power node such as a pico base station or a femto base station.
  • the base station may consist of several distributed network units, such as a central unit (CU) , one or more distributed units (DUs) , one or more remote radio heads (RRHs) or remote radio units (RRUs) .
  • CU central unit
  • DUs distributed units
  • RRHs remote radio heads
  • RRUs remote radio units
  • terminal device refers to any entities or devices that can wirelessly communicate with the network devices or with each other.
  • the terminal device can include a mobile phone, a mobile terminal (MT) , a mobile station (MS) , a subscriber station (SS) , a portable subscriber station (PSS) , an access terminal (AT) , a computer, a wearable device, an on-vehicle communication device, a machine type communication (MTC) device, a device to device (D2D) communication device, a vehicle to everything (V2X) communication device, a sensor and the like.
  • MTC machine type communication
  • D2D device to device
  • V2X vehicle to everything
  • sensor a sensor and the like.
  • the term “terminal device” can be used interchangeably with a UE, a user terminal, a mobile terminal, a mobile station, or a wireless device.
  • Fig. 1 illustrates an example communication network 100 in which exemplary embodiments of the present disclosure may be implemented.
  • the communication network 100 may be a radio access network (RAN) , e.g., a 5G New Radio (NR) RAN.
  • RAN radio access network
  • NR 5G New Radio
  • the communication network 100 may include a plurality of user equipments (UEs) 110a-110c (each also individually referred to as UE 110 or collectively as UEs 110) and a base station 120 in communication with one or more of the plurality of UEs 110a-110c.
  • UEs user equipments
  • the base station 120 is shown as a 5G base station gNB, but it may also be implemented as other base stations like a Long Term Evolution (LTE) base station eNB, a beyond 5G base station or a future base station.
  • the base station 120 may communicate with one or more of the UEs 110 via uplink (UL) and downlink (DL) channels over a Uu interface.
  • the base station 120 may implement other radio access technologies to communicate with one or more of the UEs 110.
  • the UEs 110 may be a mobile phone, a vehicle mounted terminal, a roadside unit or the like. In addition to communicating with the base station 120, the UEs 110 may also perform direct communication, referred to as sidelink (SL) communication, to each other over for example a PC5 interface.
  • the UEs 110 each may function as a SL transmitter (Tx) UE to transmit transmissions on the sidelink or a SL receiver (Rx) UE to receive transmissions on the sidelink.
  • the Tx UE may transmit sidelink transmissions to one or more Rx UEs by unicast, groupcast or broadcast with or without control of the network.
  • the sidelink may be established between the UEs 110 of which all are within the network coverage (in-coverage scenario) , all are outside the network coverage (out-of-coverage scenario) , or one or more are within the network coverage while the others are outside the network coverage (partial-coverage scenario) .
  • the UEs 110 may use different spectrum for different sidelink communications.
  • the UEs 110 may transmit a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) in a licensed spectrum e.g. LTE or NR bands, and transmit a sidelink reference signal e.g. a sidelink positioning reference signal (SL-PRS) in an unlicensed spectrum.
  • the unlicensed spectrum may refer to any frequency band (s) that does not require a license from an appropriate regulating entity, such that the frequency band (s) are open to use by any devices, not just devices that have a license to use the particular frequency band (s) . Examples of the unlicensed spectrum that have worldwide availability include 2.4 GHz, 5 GHz and 60 GHz.
  • the unlicensed spectrum may also be used by other communication systems.
  • the 2.4 GHz and 5 GHz frequency bands are used for WiFi communication.
  • a Tx UE needs to perform a clear channel assessment procedure to evaluate whether a channel in the unlicensed spectrum is available or not before the Tx UE initiates a sidelink transmission in the unlicensed spectrum.
  • a Listen Before Talk (LBT) channel access mechanism is introduced for the channel availability assessment.
  • LBT Listen Before Talk
  • the Tx UE intends to initiate a sidelink transmission, it performs an “extended” LBT procedure to evaluate whether the channel is available during a contention window (CW) .
  • the “extended” LBT procedure is commonly known as LBT Type 1 or LBT Cat. 4.
  • the Tx UE acquires the “right” to access the channel for a certain period of time, denoted as channel occupancy time (COT) , immediately after the contention window.
  • COT channel occupancy time
  • Fig. 2A shows a schematic diagram of the contention window (CW) and the channel occupancy time (COT) .
  • the Tx UE may transmit the sidelink transmission upon it acquires the COT.
  • Fig. 2B is a schematic flowchart illustrating a Type 1 LBT procedure 200.
  • the UE observes the channel as a number of consecutive clear channel assessment (CCA) slots, also referred to as sensing slots.
  • CCA clear channel assessment
  • the CCA slots have a duration T sl of 9 ⁇ s.
  • the UE deems the channel as idle/available in a CCA slot if the measured power (i.e., the collected energy) during the CCA slot is below a predetermined threshold.
  • the UE when the UE senses the channel to be idle for a defer period T d at 210, the UE may initialize at 212 a backoff counter N for the Type 1 LBT procedure with a rando number uniformly distributed between 0 and CW.
  • the UE may determine whether the backoff counter N equals to zero or not. If the backoff counter N equals to zero, the UE acquires the right to access the channel for the channel occupancy time (COT) and it can transmit the sidelink transmission in the unlicensed spectrum immediately.
  • COT channel occupancy time
  • the UE may decrement the backoff counter N by one at 216 and sense the channel for an additional slot duration T sl at 218. If the channel is idle for the additional slot duration T sl , the process 200 goes back to the step 214. If the channel is busy (the collected energy is higher than or equal to the predetermined energy threshold) for the additional slot duration T sl , the UE may sense the channel at 220 until an additional defer period T d is detected to be idle, and then the process 200 may go back to the step 214.
  • transmissions can only start at the beginning of a slot (e.g., a NR slot) or a symbol within a slot (e.g., an OFDM symbol within a NR slot) .
  • the backoff counter N equals to zero (i.e., the Type 1 LBT procedure ends) , the UE acquires the right to access the channel.
  • the UE if the UE is going to start transmitting a transmission at the beginning of a slot or a symbol (the slot or the symbol is after the Type 1 LBT procedure ends) , it performs an additional short/reduced LBT procedure (e.g., checks if the channel is idle for an additional duration of a defer period T d ) right before the slot or the symbol.
  • the UE can start transmitting at the beginning of the slot or the symbol after verifying the channel is idle for the duration.
  • the UE senses the channel additionally when the UE is ready to transmit a transmission. The UE may transmit the transmission on the channel if the channel is sensed to be idle at least in a CCA slot duration T sl .
  • the UE performs the Type 1 LBT procedure based on a channel access priority class (CAPC) associated with the sidelink transmission to be transmitted in the unlicensed spectrum.
  • CAC channel access priority class
  • the above-mentioned parameters CW, m p , T d and COT for the Type 1 LBT procedure may be determined based on the CAPC.
  • the UE acquires the COT when the Type 1 LBT procedure is successfully completed, and the acquired COT is valid even in a case where the UE pauses its transmission. If the UE wants to initiate a new transmission within the COT, it is still required to perform a “reduced” (or short) LBT procedure.
  • the “reduced” LBT procedure commonly known as LBT Type 2, has the following variants:
  • Type 2A 25 ⁇ s LBT, also referred to as LBT Cat. 2
  • LBT Cat. 2 for sidelink transmissions within the initiating device acquired COT (in case a gap between two sidelink transmissions is larger than or equal to 25 ⁇ s, as well for sidelink transmissions following another sidelink transmission) ;
  • Type 2B (16 ⁇ s LBT, also referred to as LBT Cat. 2) –for sidelink transmissions within the initiating device acquired COT (only used for sidelink transmissions following another sidelink transmission with a gap equal to 16 ⁇ s) ;
  • Type 2C (no LBT, also referred to as LBT Cat. 1) –for sidelink transmission following another sidelink transmission with a gap less than 16 ⁇ s and the allowed duration of the sidelink transmission is less than or equal to 584 ⁇ s.
  • the initiating UE i.e., the UE initiating the sidelink transmission
  • the initiating UE may inform, e.g. via a control signaling, the responding UE about the duration of the COT.
  • the responding UE may use this information to decide which type of LBT it should apply upon performing a transmission for which the intended receiver is the initiating UE.
  • the responding UE will have to acquire a new COT using the LBT Type 1 with an appropriate CAPC.
  • Fig. 3 illustrates an example of sidelink communications 300 between multiple UEs.
  • a first UE 110a may perform the Type 1 LBT procedure to obtain a first COT at 310 and then transmit at 312 a sidelink transmission via PSCCH/PSSCH to a second UE 110b within the first COT.
  • the first UE 110a may also share the first COT with the second UE 110b via a control signaling.
  • the second UE 110b may perform the “reduced” LBT (LBT Type 2) to confirm channel availability at 314 and transmit at 316 a hybrid automatic retransmission request (HARQ) feedback via a physical sidelink feedback channel (PSFCH) to the first UE 110a, in response to the PSCCH/PSSCH transmission received from the first UE 110a.
  • the PSFCH is introduced to enable HARQ feedback over sidelink from a UE that is the intended recipient of a sidelink transmission (i.e., the Rx UE) to a UE that performed the sidelink transmission (i.e., the Tx UE) .
  • the Rx UE If the Rx UE receives and decodes the sidelink transmission successfully, it generates a positive HARQ acknowledgement (ACK) and sends the HARQ ACK on the PSFCH to the Tx UE to confirm successful receipt of the sidelink transmission. If the Rx UE fails to receive or decode the sidelink transmission, it generates a negative HARQ acknowledgement (NACK) and sends the HARQ NACK on the PSFCH to the Tx UE to request for a retransmission of the sidelink transmission.
  • ACK positive HARQ acknowledgement
  • NACK negative HARQ acknowledgement
  • the second UE 110b may perform the Type 1 LBT procedure to obtain a second COT at 318 and then transmit at 320 the sidelink transmission on e.g. PSCCH/PSSCH to the third UE 110c.
  • the second UE 110b may also share the second COT with the third UE 110c via a control signaling.
  • the third UE 110c may perform the Type 2 LBT procedure to confirm channel availability at 322 and transmit at 324 an HARQ feedback on the PSFCH to the second UE 110b, in response to the sidelink transmission received from the second UE 110b.
  • the Rx UE may apply continuous PRS sequence detection. This, however, requires high power consumption.
  • Another option for the Rx UE is to perform PRS sequence detection only at a slot/symbol indicated from the Tx UE. In this case, however, the Tx UE may not be able to catch the channel before the indicated slot/symbol, which results in a high latency.
  • a mechanism of efficient PRS detection for sidelink positioning in the unlicensed spectrum is provided.
  • a Tx UE can dynamically determine an efficient way for a Rx UE to detect the sidelink PRS transmitted in the unlicensed spectrum. For example, if a delay between PSSCH and associated PSFCH is longer than remaining time of the LBT procedure performed at the Tx UE for the PRS transmission, the Tx UE may use the modified PSFCH to inform the Rx UE of whether the LBT procedure performed at the Tx UE is successful or not.
  • the Tx UE may request the Rx UE to perform the same LBT procedure as the LBT procedure performed at the Tx UE to predict the timing of the PRS transmission.
  • the Tx UE can transmit the PRS to the Rx UE in the unlicensed spectrum and transmit positioning related control information to the Rx UE in the licensed spectrum, so that the positioning related control information can be transmitted before the Tx UE acquires the right to transmit the PRS in the unlicensed spectrum.
  • the proposed mechanism can enable the Rx UE to detect the PRS promptly in the unlicensed spectrum with reduced complexity and power consumption.
  • Fig. 4 illustrates a process 400 of sidelink PRS transmission and detection in the unlicensed spectrum according to an example embodiment of the present disclosure.
  • the process 400 may be performed by a Tx UE to transmit the sidelink PRS and one or more Rx UEs to receive the sidelink PRS.
  • the Tx and Rx UEs may include a plurality of means, modules, components or elements for performing operations in the process 400, and the means, modules, components or elements may be implemented in various manners, including but not limited to software, hardware, firmware, or any combination thereof.
  • the Tx UE 110a may perform a sidelink positioning establishment procedure with the Rx UE 110b in response to a request for sidelink positioning from a higher layer.
  • the sidelink positioning request may be associated with a procedure for positioning the Tx UE 110a or the Rx UE 110b.
  • the Tx UE 110a may determine whether the Tx UE 110a and the Rx UE 110b observe the same radio environment.
  • the Tx UE 110 may determine whether the Tx UE 110a and the Rx UE 110b are in the same radio environment based on a distance between the Tx UE 110a and the Rx UE 110b.
  • the Tx UE 110a may estimate a rough distance between the Tx UE 110a and the Rx UE 110b by exploiting a reference signal received from the Rx UE 110b, e.g., a demodulation reference signal (DMRS) received on the PSSCH from the Rx UE 110b. If the distance is less than or equal to a configured threshold, the Tx UE 110a determines that the Tx UE 110a and the Rx UE 110b observe the same radio environment.
  • DMRS demodulation reference signal
  • the Tx UE 110a and the Rx UE 110b can exchange information via PSSCHs transmitted in the licensed spectrum. Since the carrier is in the licensed spectrum, the distance estimation is rough, which is not accurate enough for positioning but is acceptable for the radio environment estimation.
  • the Tx UE 110 may determine whether the Tx UE 110a and the Rx UE 110b are in the same radio environment based on channel measurements made by the Tx UE 110a and the Rx UE 110b. In the sidelink positioning establishment procedure, the Tx UE 110a and the Rx UE 110b can negotiate when and how to measure channels in the unlicensed spectrum and then measure the channels in the unlicensed spectrum as negotiated. The Rx UE 110b may send its measurement to the Tx UE 110a e.g. via the PSSCH in the licensed spectrum.
  • the Tx UE 110a can determine that the Tx UE 110a and the Rx UE 110b are in the same radio environment. It would be appreciated that the Tx UE 110a and the Rx UE 110b may also use other solutions to determine if they are in the same radio environment, and the example embodiments are not limited to the examples described above.
  • the Tx UE 110a may initiate the Type 1 LBT procedure. Before initiating the Type 1 LBT procedure, the Tx UE 110a may determine parameters for the Type 1 LBT procedure. For example, the Tx UE 110a may determine the contention window (CW) value, the deferred period T d , the channel occupancy time (COT) value for the Type 1 LBT procedure based on a channel access priority class (CAPC) associated with the sidelink positioning reference signal (PRS) .
  • the Type 1 LBT procedure may be performed as described above with reference to Fig. 2B, and a repetitive description thereof is omitted here for convenience.
  • the Tx UE 110a may select a sidelink resource for transmission of positioning related control information in the licensed spectrum.
  • the positioning related control information may be transmitted as a part of sidelink control information (SCI) .
  • the SCI may have a two stage SCI structure, including a first stage SCI carried on the PSCCH and a second stage SCI carried on the PSSCH, to support a size difference between SCIs for various NR sidelink service types.
  • the Tx UE 110a may select a PSCCH or/and PSSCH resource for transmission of the SCI containing the positioning related control information.
  • Two radio resource allocation modes may be configured for the Tx UE 110a.
  • the network is responsible for sidelink resource allocation to the Tx UE 110a.
  • the Tx UE 110a may transmit a sidelink scheduling request (SL-SR) to the base station 120, and the base station 120 may send a resource allocation to the Tx UE 110a in response to the received SL-SR.
  • SL-SR sidelink scheduling request
  • the Tx UE 110a can autonomously select a sidelink resource from a sidelink resource pool (s) configured for the Tx UE 110a. For example, the Tx UE 110a may first perform a sensing procedure over the configured sidelink resource pool to obtain knowledge of the reserved resources, and then select a sidelink resource based on the sensing result.
  • the Tx UE 110a may perform the operation 412 before the operation 414, or perform the operations 412, 414 in parallel.
  • the Type 1 LBT procedure may be still in progress.
  • the Tx UE 110a may perform the operation 412 after the operation 418.
  • the Tx UE 110a may initiate the Type 1 LBT procedure after transmitting the positioning related control information to the Rx UE 110b using the selected sidelink resource in the licensed spectrum.
  • the Tx UE 110a may decide an efficient way of sidelink PRS detection for the Rx UE 110b.
  • the Tx UE 110a can dynamically determine the efficient PRS detection for the Rx UE 110b based on for example at least one of progress of the Type 1 LBT procedure initiated at the Tx UE 110a, a delay between the selected sidelink resource for transmission of the positioning related control information and a physical sidelink feedback channel (PSFCH) resource associated with the selected sidelink resource, the radio environment of the Tx UE 110a and the Rx UE 110b, or additional factors.
  • PSFCH physical sidelink feedback channel
  • the Tx UE 110a can estimate that the Type 1 LBT procedure would end before an HARQ feedback is transmitted on the PSFCH. Then the Tx UE 110a can decide to reuse the PSFCH resource to notify the Rx UE 110 whether the Type 1 LBT procedure is successful or not.
  • the estimated remaining time of the Type 1 LBT procedure may be determined as at least n times of the CCA sensing slot duration T sl (n ⁇ T sl ) where n is the current value of the backoff counter N.
  • the delay between the selected sidelink resource and the associated PSFCH resource may be determined from a PSSCH-to-PSFCH time gap parameter K configured via an information element sl-MinTimeGapPSFCH for the Tx UE 110a and the Rx UE 110b.
  • K a PSSCH-to-PSFCH time gap parameter
  • the associated PSFCH resource is expected in a slot s+a where a is the smallest integer larger than or equal to K.
  • external interference may also be considered when the Tx UE 110a decide whether to reuse the PSFCH to notify the Rx UE 110 whether the Type 1 LBT procedure is successful or not. If there is almost no or sporadic external interference, the probability that the Rx UE 110b successfully receives the sidelink transmission from the Tx UE 110a is high. Therefore, the Rx UE 110b does not need to use the PSFCH to confirm successful receipt of the sidelink transmission, and the Tx UE 110a can reuse the PSFCH to notify the Rx UE 110b of whether the LBT procedure initiated at the Tx UE 110a is successful or not. And if there is almost no or sporadic external interference, the channel is idle most of the time within the delay.
  • the Tx UE 110a may decide at 416 to indicate the Rx UE 110b to perform the Type 1 LBT procedure to predict the timing of PRS transmission from the Tx UE 110a.
  • the Rx UE 110b may perform the Type 1 LBT procedure in synchronization with the Type 1 LBT procedure performed at the Tx UE 110a, which will be described in detail below.
  • the LBT procedure performed at the Tx UE 110a will be referred to as first LBT procedure
  • the LBT procedure performed at the Rx UE 110b will be referred to as second LBT procedure.
  • the Tx UE 110a may transmit the positioning related control information to the Rx UE 110b using the selected sidelink resource in the licensed spectrum.
  • the positioning related control information may be contained in the sidelink control information (SCI) , and the positioning related control information may be transmitted to the Rx UE 110b before the first LBT procedure initiated at the Tx UE 110a ends.
  • SCI sidelink control information
  • the positioning related control information may include an indication for the Rx UE 110b to receive a notification of whether the first LBT procedure is successful or not, or an indication for the Rx UE 110b to perform the second LBT procedure.
  • the indication for the Rx UE 110b to perform the second LBT procedure may include one or more parameters related to the first LBT procedure performed at the Tx UE 110a.
  • the one or more parameters related to the first LBT procedure may include for example at least one of the starting or continuing time of the first LBT procedure, a current value of the backoff counter of the first LBT procedure, the defer period of the first LBT, the energy threshold for the first LBT procedure, or the channel access priority class for the first LBT procedure.
  • the Rx UE 110b may perform the second LBT procedure at 420.
  • the UE 110b may perform the second LBT procedure using the one or more parameters of the first LBT procedure such that the first LBT procedure and the second LBT procedure are performed synchronously with each other.
  • the Rx UE 110b may initiate the backoff counter N for the second LBT procedure with the current backoff counter value of the first LBT procedure.
  • the first LBT procedure performed at the Tx UE 110a ends successfully. If the Rx UE 110b was indicated to perform the second LBT procedure at 418, the second LBT procedure performed at the Rx UE 110b also ends successfully at the same time at 422b because the Tx UE 110a and the Rx UE 110b are in the same radio environment and the second LBT procedure is performed synchronously with the first LBT procedure.
  • the Rx UE 110b may determine at 423 the timing for the sidelink positioning reference signal (PRS) detection.
  • the Rx UE 110b may decide to perform the sidelink PRS detection in the unlicensed spectrum immediately after the second LBT procedure ends successfully.
  • the Rx UE 110b may decide to start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of a slot (e.g., a NR slot) or a symbol within a slot (e.g., an OFDM symbol within a NR slot) .
  • the slot or the symbol is after the second LBT procedure ends successfully.
  • the Rx UE 110b may perform an additional short/reduced LBT procedure (e.g., checks if the channel is idle for an additional duration of a defer period T d ) right before the slot or the symbol.
  • the Rx UE 110b may start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of the slot or the symbol after verifying the channel is idle for the duration.
  • the Rx UE 110b If the Tx UE 110a indicates the Rx UE 110b to receive a notification of whether the first LBT procedure is successful or not at 418, the Rx UE 110b knows that the PSFCH resource associated with transmission of the positioning related control information is used to convey the notification, and then the Rx UE 110b would not transmit the HARQ feedback to the Tx UE 110a on the PSFCH resource associated with the positioning related control information. Instead, at 424, the Rx UE 110b would receive the notification transmitted from the Tx UE 110a on the PSFCH resource.
  • the first LBT procedure may have already successfully ended when the Tx UE 110a transmits the notification on the PSFCH resource to the Rx UE 110b. Then the Tx UE 110a may transmit HARQ ACK on the PSFCH resource to the Rx UE 110b, and the Rx UE 110b can determine from the HARQ ACK that the first LBT procedure is successful.
  • the Tx UE 110a may transmit HARQ NACK on the PSFCH resource to the Rx UE 110b.
  • the Rx UE 110b can determine from the HARQ NACK that the first LBT procedure has not ended successfully.
  • the Rx UE 110b may determine at 425 the timing for the sidelink positioning reference signal (PRS) detection based on the received notification. In an example, if the received notification indicates that the first LBT procedure initiated by the Tx UE 110a ends successfully, the Rx UE 110b may decide to perform the sidelink PRS detection in the unlicensed spectrum immediately.
  • PRS sidelink positioning reference signal
  • the Rx UE 110b may decide to start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of a slot (e.g., a NR slot) or a symbol within a slot (e.g., an OFDM symbol within a NR slot) .
  • the slot or the symbol is after that the notification is received at the Rx UE 110b.
  • the Rx UE 110b may decide not to detect the sidelink PRS transmitted from the Tx UE 110a in the unlicensed spectrum. In this case, the operations 418, 424 and 425 may be performed repeatedly until the first LBT procedure ends successfully.
  • the positioning related control information may further include a resource allocation for transmission of the LBT ending notification.
  • the Rx UE 110b can use the PSFCH resource to confirm receipt of the positioning related control information as usual, and the Tx UE 110a can transmit the LBT ending notification to the Rx UE 110b based on the resource allocation.
  • the Rx UE 110b may start to detect the sidelink PRS in the unlicensed spectrum at 426.
  • the Tx UE 110a may transmit the sidelink PRS to the Rx UE 110b in the unlicensed spectrum at 428.
  • the Tx UE 110a may transmit the sidelink PRS periodically during the channel occupancy time (COT) obtained through the first LBT procedure.
  • COT channel occupancy time
  • the Rx UE 110b may transmit a measurement report related to the sidelink PRS to the Tx UE 110a.
  • the Rx UE 110b may transmit the measurement report in the licensed spectrum or in the unlicensed spectrum.
  • the Rx UE 110b may perform a Type 2 LBT procedure to confirm channel availability if the measurement report transmission is within the COT shared by the Tx UE 110a or perform a new Type 1 LBT procedure to obtain a new COT if the measurement report transmission is after the COT shared by the Tx UE 110a.
  • the Tx UE 110a can dynamically determine an efficient sidelink PRS detection for the Rx UE 110b, and thus the Rx UE can detect the sidelink PRS promptly in the unlicensed spectrum with reduced complexity and power consumption. Since the PSFCH may be reused to inform the Rx UE of the LBT procedure ending at the Tx UE, the signaling overhead is not significantly increased between the Tx UE and the Rx UE.
  • the first LBT procedure (e.g. the Type 1 LBT procedure) may end before the preparation of the positioning related control information.
  • the Tx UE 110a may transmit the positioning related control information to the Rx UE 110b using the selected sidelink resource in the licensed spectrum indicating the first LBT procedure ends.
  • the Rx UE 110b may determine the timing for the sidelink positioning reference signal (PRS) detection based on the positioning related control information.
  • the Rx UE 110b may decide to perform the sidelink PRS detection in the unlicensed spectrum immediately after it received the positioning related control information.
  • PRS sidelink positioning reference signal
  • the Rx UE 110b may decide to start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of a slot (e.g., a NR slot) or a symbol within a slot (e.g., an OFDM symbol within a NR slot) .
  • the slot or the symbol is after the Rx UE 110b received the positioning related control information.
  • the Rx UE 110b may perform an additional short/reduced LBT procedure (e.g., checks if the channel is idle for an additional duration of a defer period T d ) right before the slot or the symbol.
  • the Rx UE 110b may start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of the slot or the symbol after verifying the channel is idle for the duration.
  • the first LBT procedure is a Type 2 LBT procedure and the first LBT procedure is initiated after the operation 418.
  • the Tx UE 110a may transmit the positioning related control information to the Rx UE 110b using the selected sidelink resource in the licensed spectrum indicating the first LBT procedure is a Type 2 LBT procedure.
  • the Rx UE 110b may determine the timing for the sidelink positioning reference signal (PRS) detection based on the positioning related control information.
  • the Rx UE 110b may decide to perform the sidelink PRS detection in the unlicensed spectrum immediately after it received the positioning related control information.
  • PRS sidelink positioning reference signal
  • the Rx UE 110b may decide to start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of a slot (e.g., a NR slot) or a symbol within a slot (e.g., an OFDM symbol within a slot) .
  • the slot or the symbol is after the Rx UE 110b received the positioning related control information.
  • the Rx UE 110b may perform an additional short/reduced LBT procedure (e.g., Type 2 LBT) right before the slot or the symbol.
  • the Rx UE 110b may start performing the sidelink PRS detection in the unlicensed spectrum at the beginning of the slot or the symbol after verifying the channel is idle.
  • Fig. 5 is a schematic block diagram illustrating an apparatus 500 according to an example embodiment of the present disclosure.
  • the apparatus 500 may be implemented at a terminal device like the Tx UE 110a to perform operations relating to the Tx UE 110a as discussed above. Since the operations relating to the Tx UE 110a have been discussed in detail with reference to Figs. 1-5, the blocks of the apparatus 500 will be described briefly here and details thereof may refer to the above description.
  • the apparatus 500 may include a first means 510, a second means 520 and a third means 530.
  • the first means 510 may initiate a first listen before talk (LBT) procedure before the Tx UE 110a transmits a sidelink positioning reference signal (PRS) to the Rx UE 110b in an unlicensed spectrum during a sidelink positioning session.
  • the second means 520 may transmit positioning related control information to the Rx UE 110b in a licensed spectrum.
  • the positioning related control information may include an indication for the Rx UE 110b to receive a notification of whether the first LBT procedure initiated by the Tx UE 110a is successful or to perform a second LBT procedure.
  • the third means 530 may transmit the sidelink PRS in the unlicensed spectrum in response to the first LBT procedure initiated by the Tx UE 110a ending successfully.
  • the indication for the Rx UE 110b to perform the second LBT procedure may include one or more parameters related to the first LBT initiated at the Tx UE 110a, so that the Rx UE 110b can perform the second LBT procedure synchronously with respect to the first LBT procedure performed at the Tx UE 110a.
  • the one or more parameters related to the first LBT procedure may include at least one of starting or continuing time of the first LBT procedure, a backoff counter value of the first LBT procedure, a defer period of the first LBT procedure, an energy threshold for the first LBT procedure, or a channel access priority class for the first LBT procedure.
  • the positioning related control information is transmitted before the first LBT procedure ends.
  • the apparatus 500 may further include a fourth means 540 and a fifth means 550.
  • the fourth means 540 may select a sidelink resource for transmitting the positioning related control information to the Rx UE 110b.
  • the fifth means 550 may decide whether to notify the Rx UE 110b of whether the first LBT procedure is successful or to indicate the Rx UE 110b to perform the second LBT procedure, based on at least one of: progress of the first LBT procedure, a delay between the selected sidelink resource and a sidelink feedback channel resource associated with the selected sidelink resource, or radio environment of the Tx UE 110a and the Rx UE 110b.
  • the fifth means 550 may decide to notify the Rx UE 110b of whether the first LBT procedure is successful in a case where the delay between the selected sidelink resource and the sidelink feedback channel resource associated with the selected sidelink resource is longer than estimated remaining time of the first LBT procedure.
  • the fifth means 550 may decide to indicate the Rx UE 110b to perform the second LBT procedure in a case where the Tx UE 110a and the Rx UE 110b are in a same radio environment.
  • the apparatus 500 may further include a sixth means 560 for transmitting to the Rx UE 110b the notification of whether the first LBT procedure is successful on a sidelink feedback channel resource associated with the positioning related control information in a case where the positioning related control information comprises the indication for the Rx UE 110b to receive the notification.
  • the apparatus 500 may further include a seventh means 570 for determining whether the Tx UE 110a and the Rx UE 110b are in a same radio environment before transmitting the positioning related control information.
  • the seventh means 570 determines the Tx UE 110a and the Rx UE 110b are in the same radio environment in a case where a distance between the Tx UE 110a and the Rx UE 110b is less than or equal to a threshold, or the Tx UE 110a and the Rx UE 110b obtain a same measurement result by measuring the unlicensed spectrum.
  • the first LBT procedure performed at the Tx UE 110a is a Type 1 LBT procedure
  • the second LBT procedure performed at the Rx UE 110b is a Type 1 LBT procedure.
  • Fig. 6 is a schematic block diagram illustrating an apparatus 600 according to an example embodiment of the present disclosure.
  • the apparatus 600 may be implemented at a terminal device like the Rx UE 110b to perform operations relating to the Rx UE 110b as discussed above. Since the operations relating to the Rx UE 110b have been discussed in detail with reference to Figs. 1-5, the blocks of the apparatus 600 will be described briefly here and details thereof may refer to the above description.
  • the apparatus 600 may include a first means 610 for receiving positioning related control information from the Tx UE 110a over sidelink in the licensed spectrum, and a second means 620 for performing sidelink positioning reference signal (PRS) detection in the unlicensed spectrum at a timing determined based on the positioning related control information.
  • the positioning related control information may include an indication for the Rx UE 110b to receive a notification of whether a first LBT procedure initiated by the Tx UE 110a is successful or to perform a second LBT procedure.
  • the apparatus 600 may further include a third means 630 for receiving the notification of whether the first LBT procedure initiated by the Tx UE 110a is successful on a sidelink feedback channel resource associated with the positioning related control information in a case where the positioning related control information comprises the indication for the Rx UE 110b to receive the notification, and a fourth means 640 for determining the timing for the sidelink PRS detection when the received notification indicates the first LBT procedure initiated by the Tx UE 110a is successful.
  • the apparatus 600 may further include a fifth means 650 for performing the second LBT procedure in a case where the positioning related control information includes the indication for the Rx UE 110b to perform the second LBT procedure, and a sixth means 660 for determining the timing for the sidelink PRS detection when the second LBT procedure performed at the Rx UE 110b is successful.
  • the indication for the Rx UE 110b to perform the second LBT procedure may include one or more parameters related to the first LBT procedure initiated by the Tx UE 110a.
  • the one or more parameters related to the first LBT procedure may include at least one of starting or continuing time of the first LBT procedure, a backoff counter value of the first LBT procedure, a defer period of the first LBT procedure, an energy threshold for the first LBT procedure, or a channel access priority class for the first LBT procedure.
  • the first LBT procedure initiated by the Tx UE 110a is a Type 1 LBT procedure and the second LBT procedure performed at the Rx UE 110b is a Type 1 LBT procedure.
  • Fig. 7 illustrates a schematic block diagram of a device 700 according to an example embodiment of the present disclosure.
  • the device 700 may be implemented as the Tx UE 110a and/or the Rx UE 110b discussed above.
  • the device 700 may include one or more processors 711, one or more memories 712 and one or more transceivers 713 interconnected through one or more buses 714.
  • the one or more buses 714 may be address, data, or control buses, and may include any interconnection mechanism such as series of lines on a motherboard or integrated circuit, fiber, optics or other optical communication equipment, and the like.
  • Each of the one or more transceivers 713 may comprise a receiver and a transmitter, which are connected to one or more antennas 716.
  • the device 700 may wirelessly communicate with a network device or a terminal device through the one or more antennas 716.
  • the one or more memories 712 may include instructions 715 which, when executed by the one or more processors 711, may cause the device 700 to perform operations relating to the Tx UE 110a and/or operations relating to the Rx UE 110b as described above.
  • the one or more processors 711 may be of any appropriate type that is suitable for the local technical network, and may include one or more of general purpose processors, special purpose processor, microprocessors, a digital signal processor (DSP) , one or more processors in a processor based multi-core processor architecture, as well as dedicated processors such as those developed based on Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC) .
  • the one or more processors 711 may be configured to control other elements of the device 700 and operate in cooperation with them to implement the procedures discussed above.
  • the one or more memories 712 may include at least one storage medium in various forms, such as a volatile medium and/or a non-volatile medium.
  • the volatile memory may include but not limited to for example a random access memory (RAM) or a cache.
  • the non-volatile memory may include but not limited to for example a read only memory (ROM) , a hard disk, a flash memory, and the like.
  • the one or more memories 712 may include but not limited to an electric, a magnetic, an optical, an electromagnetic, an infrared, or a semiconductor system, apparatus, or device or any combination of the above.
  • Some exemplary embodiments further provide computer program code or instructions which, when executed by one or more processors, may cause a device or apparatus to perform the procedures described above.
  • the computer program code or instructions for carrying out procedures of the exemplary embodiments may be written in any combination of one or more programming languages.
  • the computer program code or instructions may be provided to one or more processors or controllers of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code or instructions, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code or instructions may be executed entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • Some exemplary embodiments further provide a non-transitory computer program product or a non-transitory computer readable medium having the computer program code or instructions stored therein.
  • the term “non-transitory” as used herein is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .
  • the non-transitory computer readable medium may be any tangible medium that may contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • blocks in the drawings may be implemented in various manners, including software, hardware, firmware, or any combination thereof.
  • one or more blocks may be implemented using software and/or firmware, for example, machine-executable instructions stored in the storage medium.
  • parts or all of the blocks in the drawings may be implemented, at least in part, by one or more hardware logic components.
  • FPGAs Field-Programmable Gate Arrays
  • ASICs Application-Specific Integrated Circuits
  • ASSPs Application-Specific Standard Products
  • SOCs System-on-Chip systems
  • CPLDs Complex Programmable Logic Devices

Landscapes

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

Abstract

Des exemples de modes de réalisation de la présente divulgation concernent des dispositifs, des procédés, des appareils et des supports lisibles par ordinateur prenant en charge une détection de signal de référence de positionnement efficace pour un positionnement de liaison latérale dans un spectre sans licence. Un premier dispositif terminal dans un réseau d'accès radio peut être conçu pour lancer une première procédure "écouter avant de parler" avant de transmettre un signal de référence de positionnement de liaison latérale à un second dispositif terminal dans le réseau d'accès radio dans un spectre sans licence pendant une session de positionnement de liaison latérale, transmettre des informations de commande associées au positionnement au second dispositif terminal dans un spectre sous licence, et transmettre le signal de référence de positionnement de liaison latérale dans le spectre sans licence en réponse à la fin réussie de la première procédure "écouter avant de parler". Les informations de commande relatives au positionnement comprennent une indication pour que le second dispositif terminal reçoive une notification indiquant si la première procédure "écouter avant de parler" est réussie ou pour effectuer une seconde procédure "écouter avant de parler".
PCT/CN2022/111335 2022-08-10 2022-08-10 Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence WO2024031408A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/111335 WO2024031408A1 (fr) 2022-08-10 2022-08-10 Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/111335 WO2024031408A1 (fr) 2022-08-10 2022-08-10 Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence

Publications (1)

Publication Number Publication Date
WO2024031408A1 true WO2024031408A1 (fr) 2024-02-15

Family

ID=89850152

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/111335 WO2024031408A1 (fr) 2022-08-10 2022-08-10 Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence

Country Status (1)

Country Link
WO (1) WO2024031408A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210058889A1 (en) * 2019-08-23 2021-02-25 Qualcomm Incorporated Ranging signal transmission in unlicensed band
CN112425248A (zh) * 2018-05-15 2021-02-26 上海诺基亚贝尔股份有限公司 Nr未许可频谱中的rlm的增强型rs传输
US20220240074A1 (en) * 2021-01-27 2022-07-28 Qualcomm Incorporated Timing determination for signals in sidelink positioning

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112425248A (zh) * 2018-05-15 2021-02-26 上海诺基亚贝尔股份有限公司 Nr未许可频谱中的rlm的增强型rs传输
US20210058889A1 (en) * 2019-08-23 2021-02-25 Qualcomm Incorporated Ranging signal transmission in unlicensed band
US20220240074A1 (en) * 2021-01-27 2022-07-28 Qualcomm Incorporated Timing determination for signals in sidelink positioning

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
INTEL CORPORATION: "Rel-18 NR Positioning", 3GPP DRAFT; RP-212335, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. 20210913 - 20210917, 6 September 2021 (2021-09-06), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052049594 *
ZTE: "Discussion on Rel-18 NR positioning evolution", 3GPP DRAFT; RP-213385, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. Electronic Meeting; 20211206 - 20211217, 29 November 2021 (2021-11-29), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052097472 *

Similar Documents

Publication Publication Date Title
US11265911B2 (en) Methods for performing multi-subframe scheduling in enhanced LAA
US11546943B2 (en) Uplink carrier selection for PRACH transmission between a NR dedicated carrier and a LTE/NR shared carrier
US20240057169A1 (en) Method and apparatus for performing multiple rach procedures
WO2017024998A1 (fr) Procédé et dispositif de transmission de données
KR20160126009A (ko) 비면허 스펙트럼에서의 동작을 위한 채널 예약
JP2017520149A (ja) ライセンスド周波数帯タイミングを有するアンライセンスド周波数帯
CN108810827B (zh) 获取系统信息的方法和装置
US20200351923A1 (en) Uplink Transmission Scheme
CN111972028A (zh) 无线通信的设备及该设备的无线通信方法
EP3105975B1 (fr) Procédé et appareil pour l'exécution de transmission de sous-trame fractionnelle
US20220182877A1 (en) Methods and apparatus for reducing overhead in a random access procedure
CN116326057A (zh) 用于免许可频谱中的nr侧链通信的harq反馈
EP4319448A2 (fr) Évitement de collision avec transmission synchronisée
ES2927128T3 (es) Indicación de uso del destinatario para una frecuencia portadora en BFD/IBFD
WO2020088498A1 (fr) Procédés et dispositifs d'accès aléatoire
CN111919481B (zh) 用于无线通信系统中的上行链路传输的方法、设备和计算机可读介质
US11490422B2 (en) Methods, terminal device and base station for channel sensing in unlicensed spectrum
WO2020029070A1 (fr) Procédé, appareil et supports lisibles par ordinateur pour le traitement d'images
WO2024031408A1 (fr) Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence
US20190215865A1 (en) Self-contained communication with coordination signaling for listen-after-talk scheme
KR20240004980A (ko) 사이드링크 ue 간 조정 프로시저들
US20210168739A1 (en) Method and apparatus for data transmission on common resources
EP3890224A1 (fr) Procédé d'envoi de signal de liaison montante et terminal
WO2023201610A1 (fr) Affectation d'une ressource secondaire de retour de harq pour une communication sur liaison latérale dans un spectre sans licence
EP3105985B1 (fr) Procédé et appareil pour la transmission fractionnelle d'une sous-trame

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22954384

Country of ref document: EP

Kind code of ref document: A1