WO2021012981A1 - Procédés et appareils de transmission de signaux de référence de sondage - Google Patents

Procédés et appareils de transmission de signaux de référence de sondage Download PDF

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Publication number
WO2021012981A1
WO2021012981A1 PCT/CN2020/101733 CN2020101733W WO2021012981A1 WO 2021012981 A1 WO2021012981 A1 WO 2021012981A1 CN 2020101733 W CN2020101733 W CN 2020101733W WO 2021012981 A1 WO2021012981 A1 WO 2021012981A1
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WIPO (PCT)
Prior art keywords
srs
srs resource
transmission comb
comb offset
transmission
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PCT/CN2020/101733
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English (en)
Inventor
Li Guo
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Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to CN202080010553.9A priority Critical patent/CN113366900B/zh
Publication of WO2021012981A1 publication Critical patent/WO2021012981A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present disclosure relates to the field of communication systems, and more particularly, to methods and apparatuses of sounding reference signal (SRS) transmission for positioning.
  • SRS sounding reference signal
  • a resource element (RE) mapping method in a design of sounding reference signal (SRS) specified in 3rd generation partnership project (3GPP) release 15 does not support an uplink relative time of arrival (RTOA) measurement for user equipment (UE) positioning well.
  • SRS resource configured with R > 1 each antenna port of an SRS resource is mapped to the same set of subcarriers with same transmission comb offset. That would cause some ambiguity in timing estimation.
  • Another possible implementation method to support staggered RE mapping is to configure multiple SRS resources on consecutive symbols with different transmission comb offsets based on the specification in 3GPP release 15.
  • that implementation method does not work well too because a next generation node B (gNB) cannot assume same antenna ports are transmitted in those different SRS resources transmitted on adjacent orthogonal frequency division multiplexing (OFDM) symbols.
  • gNB next generation node B
  • SRS sounding reference signal
  • An object of the present disclosure is to propose methods and apparatuses of sounding reference signal (SRS) transmission for positioning capable of improving performance of uplink relative time of arrival (RTOA) measurement that is for user equipment (UE) positioning.
  • SRS sounding reference signal
  • a method of a sounding reference signal (SRS) transmission of a user equipment (UE) includes receiving, from a base station (BS) , configuration information of transmission comb offset pattern for an SRS resource used for positioning and transmitting, to the BS, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • SRS sounding reference signal
  • a user equipment (UE) of a sounding reference signal (SRS) transmission includes a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the transceiver is configured to receive, from a base station (BS) , configuration information of transmission comb offset pattern for an SRS resource used for positioning and the transceiver is configured to transmit, to the BS, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • BS base station
  • a method of a sounding reference signal (SRS) transmission of a base station includes transmitting, to a user equipment (UE) , configuration information of transmission comb offset pattern for an SRS resource used for positioning and receiving, from the UE, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • SRS sounding reference signal
  • a base station (BS) of a sounding reference signal (SRS) transmission includes a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the transceiver is configured to transmit, to a user equipment (UE) , configuration information of transmission comb offset pattern for an SRS resource used for positioning and the transceiver is configured to receive, from the UE, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • UE user equipment
  • a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
  • a terminal device includes a processor and a memory configured to store a computer program.
  • the processor is configured to execute the computer program stored in the memory to perform the above method.
  • a network node includes a processor and a memory configured to store a computer program.
  • the processor is configured to execute the computer program stored in the memory to perform the above method.
  • FIG. 1A illustrates a sounding reference signal (SRS) mapping.
  • SRS sounding reference signal
  • FIG. 1B illustrates an SRS resource intra-slot frequency hopping.
  • FIG. 1C illustrates an SRS resource inter-slot frequency hopping.
  • FIG. 2 is a block diagram of a user equipment (UE) and a base station (BS) of an SRS transmission according to an embodiment of the present disclosure.
  • UE user equipment
  • BS base station
  • FIG. 3 is a flowchart illustrating a method of an SRS transmission of a UE according to an embodiment of the present disclosure.
  • FIG. 4 is a flowchart illustrating a method of an SRS transmission of a BS according to an embodiment of the present disclosure.
  • FIG. 5 illustrates a procedure of an SRS transmission for positioning according to an embodiment of the present disclosure.
  • FIG. 6 illustrates a procedure of an SRS transmission for positioning according to an embodiment of the present disclosure.
  • FIG. 7A illustrates an SRS resource for positioning with a transmission comb value and a repetition factor according to an embodiment of the present disclosure.
  • FIG. 7B illustrates an SRS resource for positioning with a transmission comb value and a repetition factor according to an embodiment of the present disclosure.
  • FIG. 8 illustrates an SRS resource for positioning with a transmission comb value and a repetition factor according to an embodiment of the present disclosure.
  • FIG. 9 illustrates an SRS resource for positioning with a transmission comb value and a repetition factor according to an embodiment of the present disclosure.
  • FIG. 10 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.
  • Fifth-generation (5G) wireless systems are generally a multi-beam based system in a frequency range 2 (FR2) ranging from 24.25 GHz to 52.6 GHz, where multiplex transmit (Tx) and receive (Rx) analog beams are employed by a base station (BS) and/or a user equipment (UE) to combat a large path loss in a high frequency band.
  • a base station for example, mmWave systems
  • the BS and the UE are deployed with large number of antennas, so that a large gain beamforming can be used to defeat the large path loss and signal blockage.
  • TXRUs transmission and reception units
  • hybrid beamforming mechanisms can be utilized in both BS and UE.
  • the BS and the UE need to align analog beam directions for a particular downlink or uplink transmission.
  • the BS and the UE need to find the best pair of a BS Tx beam and a UE Rx beam while for an uplink transmission, the BS and the UE need to find the best pair of the UE Tx beam and the BS Rx beam.
  • the BS and the UE For a communication between one UE and a BS, the BS and the UE need to determine which Tx and Rx beam are going to be used. When one UE moves, the beams used by the BS and the UE for communication might change.
  • 3rd generation partnership project (3GPP) 5G specification the following functions are defined to support such multi-beam-based operation.
  • the UE can measure one or multiple Tx beams of the BS and then the UE can select the best Tx beam and report his selection to the BS.
  • the UE can also measure one or more different Rx beams and then select the best Rx beam for one particular Tx beam of the BS.
  • the gNB can also measure one or multiple Tx beams of the UE and then select the best Tx beam of the UE for an uplink transmission.
  • the BS can transmit multiple reference signal (RS) resources and then configures the UE to measure the RS resources.
  • RS reference signal
  • the UE can report an index of one or more selected RS resources that are selected based on some measure metric, for example, a layer 1 reference signal received power (L1-RSRP) .
  • L1-RSRP layer 1 reference signal received power
  • the BS can configure the UE to transmit one or more uplink RS resources, for example, sounding reference signal (SRS) resources, and then the BS can measure the RS resources.
  • SRS sounding reference signal
  • the BS can figure out which Tx beam of the UE is the best for the uplink transmission based on measuring, for example, L1-RSRP of the RS resources.
  • the BS can indicate the UE of which Tx beam of the BS is used to transmit, so that the UE can use proper Rx beam to receive the downlink transmission.
  • the BS can indicate an identify (ID) of one Tx beam of the BS to the UE.
  • the BS can use downlink control information (DCI) in a PDCCH to indicate the ID of one Tx beam that is used to transmit a corresponding PDSCH.
  • DCI downlink control information
  • the BS can also indicate the UE of which Tx beam of the UE to be used.
  • the UE uses a Tx beam that is indicated by the BS through a configuration of spatial relation information.
  • the UE uses the Tx beam that is indicated by the BS through the configuration of spatial relation information.
  • the UE uses a Tx beam that indicated by an information element contained in a scheduling DCI.
  • this function is used by the BS to switch a Tx beam used for a downlink or uplink transmission.
  • This function is useful when the Tx beam used for transmission currently is out of date due to for example a movement of the UE.
  • the BS can send signaling to the UE to inform a change of Tx beam.
  • the BS can switch an uplink Tx beam of the UE used to transmit some uplink transmission.
  • DL signals can include control signaling conveying DCI through a PDCCH, data signals conveying information packet through a PDSCH and some types of reference signals.
  • the DCI can indicate information of how the PDSCH is transmitted, including for example resource allocation and transmission parameters for the PDSCH.
  • the BS can transmit one or more types of reference signals for different purposes, including a demodulation reference symbol (DM-RS) that is transmitted along with the PDSCH and can be used by the UE to demodulate the PDSCH, a channel state information reference signal (CSI-RS) that can be used by the UE to measure BS’s Tx beam or CSI of a downlink channel between the BS and the UE, a phase tracking reference signal (PT-RS) that is also transmitted along with a PDSCH and can be used by the UE to estimate a phase noise caused by imperfection in a radio frequency (RF) part in a transmitter and a receiver and then compensate it when decoding the PDSCH.
  • DM-RS demodulation reference symbol
  • CSI-RS channel state information reference signal
  • PT-RS phase tracking reference signal
  • DL resource allocation for PDCCH, PDSCH, and reference signals is performed in a unit of orthogonal frequency division multiplexing (OFDM) symbols and a group of physical resource blocks (PRBs) .
  • Each PRB contains a few resource elements (REs) , for example 12 REs, in a frequency domain.
  • a transmission bandwidth (BW) of one downlink transmission consists of frequency resource unit called as resource blocks (RBs) and each RB consists of a few subcarriers or REs, for example, 12 subcarriers or 12 REs.
  • UL signals transmitted by the UE to the BS can include data signals conveying data packet through a PUSCH, uplink control signals conveying UL control information (UCI) which can be transmitted in the PUSCH or a PUCCH, and UL reference signals.
  • the UCI can carry a schedule request (SR) used by the UE to request an uplink transmission resource, a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for a PDSCH transmission or a channel state information (CSI) report.
  • SR schedule request
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • CSI channel state information
  • the UE can transmit one or more types of uplink reference signals for different purposes, including DM-RS that is transmitted along with a PUSCH transmission and can be used by the BS to demodulate the PUSCH, PT-RS that is also transmitted along with a PUSCH and can be used by the BS to estimate the phase noise caused by imperfection in RF parts and the BS then can compensate it when decoding PUSCH, and SRS signals that are used by the BS to measure one or more UE Tx beams or CSI of the uplink channel between the UE and the BS.
  • UL resource allocation for PUSCH, PUCCH, and UL reference signal is also performed in a unit of symbols and a group of PRBs.
  • a transmission interval for DL or UL channels/signals is referred to as a slot and each slot contains a few, for example 14, symbols in time domain.
  • the duration of one slot can be 1, 0.5, 0.25 or 0.123 millisecond, for the subcarrier spacing 15KHz, 30KHz, 60KHz, and 120 KHz, respectively.
  • NR systems support flexible numerologies and an embodiment can choose proper OFDM subcarrier spacing based on the deployment scenario and service requirement. In the NR system, DL and UL transmission can use different numerologies.
  • a beam indication is conducted per PUCCH resource.
  • a UE For a given uplink bandwidth part (BWP) in a serving Cell, a UE can be configured with 4 PUCCH resource set and in each PUCCH resource set, the UE is configured with one or more PUCCH resources.
  • the UE For a transmission on each PUCCH resource, the UE is configured with a parameter PUCCH-spatialRelationInfo, which can contain one or more reference signal resource ID (s) .
  • PUCCH-spatialRelationInfo can contain one or more reference signal resource ID (s) .
  • Each of those reference signal resource is used to provide information on which transmit beam the UE can use for the transmission on that PUCCH resource.
  • the UE can use the same Tx beam used to transmit that SRS resource on the transmission on that PUCCH resource.
  • the reference signal resource is a channel state information reference signal (CSI-RS) resource or synchronization signal/physical broadcast channel (SS/PBCH) block
  • the UE can use the uplink Tx beam corresponding to the receive beam used to receive the CSI-RS resource transmission or SS/PBCH block transmission on the transmission on that PUCCH resource.
  • CSI-RS channel state information reference signal
  • SS/PBCH synchronization signal/physical broadcast channel
  • a gNB can configure only one PUCCH-spatialRelationInfo to a PUCCH resource and when the gNB wants to switch the Tx beam of that PUCCH resource, the gNB can re-configure a radio resource control (RRC) parameter.
  • the gNB can also configure multiple PUCCH-spatialRelationInfo to a PUCCH resource in RRC and then use medium access control control element (MAC CE) signaling to activate one of those configured PUCCH-spatialRelationInfo as the current Tx beam for that PUCCH resource.
  • RRC radio resource control
  • MAC CE medium access control control element
  • the gNB wants to switch the Tx beam of one PUCCH resource, the gNB can use one MAC CE message to indicate another PUCCH-spatialRelationInfo for that PUCCH resource.
  • the gNB can use MAC CE message to indicate the PUCCH-spatialRelationInfo for each individual PUCCH resource.
  • the UE For PUSCH scheduled by DCI format 0_0 on a cell, the UE can be requested to transmit that PUSCH according to the spatial relation corresponding to the dedicated PUCCH resources with the lowest ID within the UL BWP of the cell. In other word, if the UE is scheduled with a PUSCH transmission by a DCI format 0_0 in one UL BWP, the UE can use the Tx beam configured to the PUCCH with lowest PUCCH resource ID in the same UL BWP to transmit that PUSCH.
  • the Tx beam indication/updating for PUCCH resource will be changed to per PUCCH group.
  • all the PUCCH resource can be divided into one or two groups.
  • Use case for one group is single TRP transmission and use case for two group is multi-TRP transmission. Every TRP can schedule a PUSCH transmission for a user equipment (UE) and the UE can apply different Tx beam accordingly.
  • UE user equipment
  • NR release 15 supports SRS transmission for uplink CSI acquisition, uplink beam management and antenna switching.
  • a UE can be configured with one or more SRS resource sets and for each SRS resource set, the UE can be configured with K ⁇ 1 SRS resources. Every SRS resource set is configured with a use case through a higher layer parameter SRS-ResourceSet.
  • the usage of SRS resource set includes: for codebook based PUSCH transmission, for non-codebook based PUSCH transmission, for beam management, and for antenna switching.
  • Each SRS resource contains 1, 2 or 4 antenna ports and 1, 2 or 4 consecutive symbols within one slot.
  • the SRS resource supports two type of RE mapping: Comb-2 and Comb-4.
  • Comb-2 the SRS signal is mapped to one RE for every two REs and the candidate Comb offset values are 0 or 1.
  • Comb-4 the SRS signal is mapped to one RE for every four REs and the candidate Comb offset values are 0, 1, 2, and 3. Examples of SRS signal mapping are illustrated in FIG. 1A.
  • FIG. 1A illustrates a sounding reference signal (SRS) mapping.
  • SRS resource #3 is configured with two symbols and transmission comb 4.
  • one SRS resource is configured with the following higher layer parameters: repetition factor R ⁇ ⁇ 1, 2, 4 ⁇ , number of symbols in one SRS resources: N s ⁇ ⁇ 1, 2, 4 ⁇ and SRS hopping parameters B SRS , C SRS and b hop .
  • the frequency hopping is configured implicitly through the value of R and N s .
  • Each of antenna ports of the SRS resource in each slot in mapped to different sets of subcarriers in each symbol and same transmission comb value is assumed for different sets of subcarriers.
  • FIG. 1B illustrates an SRS resource intra-slot frequency hopping.
  • FIG. 1C illustrates an SRS resource inter-slot frequency hopping. Examples of SRS resource intra-slot and inter-slot frequency hopping are shown in FIG. 1B and FIG. 1C.
  • Each of the antenna ports of the SRS resource is mapped to the same set of subcarriers within each 2 adjacent symbols in each slot.
  • inter-slot frequency hopping is supported.
  • Each of the antenna ports of the SRS resource is mapped to the same set of subcarriers in 2 adjacent symbols in each slot.
  • Each SRS resource can be configured with spatialRelationInfo to indicate a transmit (Tx) beam information for the transmission on that SRS resource.
  • the spatialRelationInfo parameter can be an ID of CSI-RS, SS/PBCH and SRS resource, configured by the serving gNB. If the spatialRelationInfo is a CSI-RS or SS/PBCH, the UE can transmit that SRS resource with Tx beam that corresponds to the Rx beam used to receive the CSI-RS or SS/PBCH. If the spatialRelationInfo is another SRS resource, the UE can transmit that SRS resource with the Tx beam same to that applied to the other SRS resource.
  • FIG. 2 illustrates that, in some embodiments, a user equipment (UE) 10 and a base station 20 of a sounding reference signal (SRS) transmission according to an embodiment of the present disclosure are provided.
  • the UE 10 may include a processor 11, a memory 12, and a transceiver 13.
  • the base station 20 such as a next generation node B (gNB) may include a processor 21, a memory 22 and a transceiver 23.
  • the processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21.
  • the memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21.
  • the transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.
  • the processor 11 or 21 may include an application-specific integrated circuit (ASIC) , other chipsets, logic circuit and/or data processing devices.
  • the memory 12 or 22 may include a read-only memory (ROM) , a random access memory (RAM) , a flash memory, a memory card, a storage medium and/or other storage devices.
  • the transceiver 13 or 23 may include baseband circuitry to process radio frequency signals.
  • modules e.g., procedures, functions, and so on
  • the modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21.
  • the memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21, in which those can be communicatively coupled to the processor 11 or 21 via various means are known in the art.
  • the transceiver 13 is configured to receive, from the base station (BS) 20, configuration information of transmission comb offset pattern for an SRS resource used for positioning and the transceiver 13 is configured to transmit, to the BS 20, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • the SRS transmission method can improve performance of uplink relative time of arrival (RTOA) measurement that is for UE positioning.
  • RTOA uplink relative time of arrival
  • the processor 11 is configured to being indicated, by the BS 20, with the SRS resource in the set of SRS resource used for positioning before transmitting, to the BS 20, the SRS resource in the set of SRS resources with the determined transmission comb offset. In some embodiments, the processor 11 is configured to determining a transmission comb offset for resource element (RE) mapping for each symbol within one SRS repetition for the SRS resource used for positioning according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning before transmitting, to the BS 20, the SRS resource in the set of SRS resources with the determined transmission comb offset.
  • RE resource element
  • the processor 11 is configured to be configured, by the BS 20, with the set of SRS resources, wherein for each SRS resource, the processor 11mis configured with a number of orthogonal frequency division multiplexing (OFDM) symbols, a repetition factor, and a starting symbol index. In some embodiments, the number of OFDM symbols is greater or equal to the repetition factor. In some embodiments, the processor 11 is configured to map each antenna port of the SRS resource to each symbol with a corresponding transmission comb offset indicated in the configured transmission comb offset pattern in each symbol within each repetition of consecutive symbols.
  • OFDM orthogonal frequency division multiplexing
  • each antenna port of the SRS resource is mapped to the same set of subcarriers but with different comb offsets on different symbols.
  • transmitting, to the BS 20, the SRS resource in the set of SRS resources with the determined transmission comb offset is configured to measure at least one of uplink relative time of arrival (RTOA) , angle of arrival (AoA) , uplink RSRP (reference signal received power) , and receive-transmit (Rx-Tx) time difference.
  • the transmission comb offset pattern comprises a UE identity (ID) , an SRS sequence ID, a cell ID, or a scrambling ID.
  • the transmission comb offset pattern comprises a transmission comb value and an SRS repetition factor.
  • the transmission comb value is 2, 4, 6, 8, or 12.
  • the processor 11 is requested, by the BS 20, to trigger the SRS transmission for positioning.
  • the processor 11 is requested, by the BS 20, to activate the SRS transmission for positioning.
  • the transceiver 23 is configured to transmit, to the user equipment (UE) 10, configuration information of transmission comb offset pattern for an SRS resource used for positioning and the transceiver 23 is configured to receive, from the UE 10, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • the SRS transmission method can improve performance of uplink relative time of arrival (RTOA) measurement that is for UE positioning.
  • RTOA uplink relative time of arrival
  • the processor 21 is configured to indicate, to the UE 10, the SRS resource in the set of SRS resource used for positioning before receiving, from the UE 10, the SRS resource in the set of SRS resources with the determined transmission comb offset. In some embodiments, the processor 21 is configured to configure, to the UE 10, the set of SRS resources, wherein for each SRS resource, the processor 21 is configured to configure, to the UE 10, a number of orthogonal frequency division multiplexing (OFDM) symbols, a repetition factor, and a starting symbol index. In some embodiments, the number of OFDM symbols is greater or equal to the repetition factor.
  • OFDM orthogonal frequency division multiplexing
  • each antenna port of the SRS resource is mapped to each symbol with a corresponding transmission comb offset indicated in the configured transmission comb offset pattern in each symbol within each repetition of consecutive symbols. In some embodiments, each antenna port of the SRS resource is mapped to the same set of subcarriers but with different comb offsets on different symbols.
  • receiving, from the UE 10, the SRS resource in the set of SRS resources with the determined transmission comb offset is configured to measure at least one of uplink relative time of arrival (RTOA) , angle of arrival (AoA) , uplink RSRP (reference signal received power) , and receive-transmit (Rx-Tx) time difference.
  • the transmission comb offset pattern comprises a UE identity (ID) , an SRS sequence ID, a cell ID, or a scrambling ID.
  • the transmission comb offset pattern comprises a transmission comb value and an SRS repetition factor. In some embodiments, the transmission comb value is 2, 4, 6, 8, or 12.
  • the processor 21 is configured to request the UE 10 to trigger the SRS transmission for positioning. In some embodiments, if the SRS resource is semi-persistent, the processor 21 is configured to request the UE 10 to activate the SRS transmission for positioning.
  • FIG. 3 illustrates a method 300 of an SRS transmission of a UE according to an embodiment of the present disclosure.
  • the method 300 includes: a block 310, receiving, from a base station (BS) , configuration information of transmission comb offset pattern for an SRS resource used for positioning, and a block 320, transmitting, to the BS, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • the SRS transmission method can improve performance of uplink relative time of arrival (RTOA) measurement that is for UE positioning.
  • RTOA uplink relative time of arrival
  • the method further comprises being indicated, by the BS, with the SRS resource in the set of SRS resource used for positioning before transmitting, to the BS, the SRS resource in the set of SRS resources with the determined transmission comb offset.
  • the method further comprises determining a transmission comb offset for resource element (RE) mapping for each symbol within one SRS repetition for the SRS resource used for positioning according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning before transmitting, to the BS, the SRS resource in the set of SRS resources with the determined transmission comb offset.
  • RE resource element
  • the method further comprises being configured, by the BS, with the set of SRS resources, wherein for each SRS resource, the UE is configured with a number of orthogonal frequency division multiplexing (OFDM) symbols, a repetition factor, and a starting symbol index. In some embodiments, the number of OFDM symbols is greater or equal to the repetition factor. In some embodiments, the method further comprises mapping each antenna port of the SRS resource to each symbol with a corresponding transmission comb offset indicated in the configured transmission comb offset pattern in each symbol within each repetition of consecutive symbols.
  • OFDM orthogonal frequency division multiplexing
  • each antenna port of the SRS resource is mapped to the same set of subcarriers but with different comb offsets on different symbols.
  • transmitting, to the BS, the SRS resource in the set of SRS resources with the determined transmission comb offset is configured to measure at least one of uplink relative time of arrival (RTOA) , angle of arrival (AoA) , uplink RSRP (reference signal received power) , and receive-transmit (Rx-Tx) time difference.
  • the transmission comb offset pattern comprises a UE identity (ID) , an SRS sequence ID, a cell ID, or a scrambling ID.
  • the transmission comb offset pattern comprises a transmission comb value and an SRS repetition factor.
  • the transmission comb value is 2, 4, 6, 8, or 12.
  • the UE if the SRS resource is aperiodic, the UE is requested, by the BS, to trigger the SRS transmission for positioning. In some embodiments, if the SRS resource is semi-persistent, the UE is requested, by the BS, to activate the SRS transmission for positioning.
  • FIG. 4 illustrates a method 400 of an SRS transmission of a BS according to an embodiment of the present disclosure.
  • the method 400 includes: a block 410, transmitting, to a user equipment (UE) , configuration information of transmission comb offset pattern for an SRS resource used for positioning, and a block 420, receiving, from the UE, the SRS resource in a set of SRS resources with a determined transmission comb offset according to the configuration information of transmission comb offset pattern for the SRS resource used for positioning.
  • the SRS transmission method can improve performance of uplink relative time of arrival (RTOA) measurement that is for UE positioning.
  • RTOA uplink relative time of arrival
  • the method further comprises indicating, to the UE, the SRS resource in the set of SRS resource used for positioning before receiving, from the UE, the SRS resource in the set of SRS resources with the determined transmission comb offset.
  • the method further comprises configuring, to the UE, the set of SRS resources, wherein for each SRS resource, the BS is configured to configure, to the UE, a number of orthogonal frequency division multiplexing (OFDM) symbols, a repetition factor, and a starting symbol index.
  • OFDM orthogonal frequency division multiplexing
  • the number of OFDM symbols is greater or equal to the repetition factor.
  • each antenna port of the SRS resource is mapped to each symbol with a corresponding transmission comb offset indicated in the configured transmission comb offset pattern in each symbol within each repetition of consecutive symbols.
  • each antenna port of the SRS resource is mapped to the same set of subcarriers but with different comb offsets on different symbols.
  • receiving, from the UE, the SRS resource in the set of SRS resources with the determined transmission comb offset is configured to measure at least one of uplink relative time of arrival (RTOA) , angle of arrival (AoA) , uplink RSRP (reference signal received power) , and receive-transmit (Rx-Tx) time difference.
  • the transmission comb offset pattern comprises a UE identity (ID) , an SRS sequence ID, a cell ID, or a scrambling ID.
  • the transmission comb offset pattern comprises a transmission comb value and an SRS repetition factor.
  • the transmission comb value is 2, 4, 6, 8, or 12.
  • the BS is configured to request the UE to trigger the SRS transmission for positioning.
  • the BS is configured to request the UE to activate the SRS transmission for positioning.
  • a UE can be configured with a set of SRS resources and for each SRS resource, the UE is configured with number of symbols Ns, repetition factor R, and starting symbol index.
  • a gNB can send configuration information of transmission comb offset pattern for SRS resource used for positioning to the UE.
  • the gNB can indicate the UE the SRS resource in the set of SRS resource is used for positioning, then the UE can transmit the SRS resource in that set with configured transmission comb offset.
  • the UE can map each antenna port of SRS resource to each symbol with the corresponding transmission comb offset indicated in the configured transmission comb offset pattern in each symbol within each repetition of R consecutive symbols.
  • FIG. 5 illustrates one procedure of SRS transmission for positioning according to the methods of an embodiment in this disclosure.
  • a serving gNB 101 can send configuration information SRS resources through higher layer parameter to a UE 102 at an operation 110.
  • the configuration information can include transmission comb value and transmission comb offset pattern for each SRS resource used for positioning.
  • the UE 102 can determine the transmission comb offset value for each symbol within each SRS repetition in one SRS resource at an operation 120. If the SRS resource is aperiodic, the serving gNB 101 sends DCI to trigger the transmission at an operation 130. If the SRS resource for positioning is semi-persistent, the serving gNB 101 can send activation command to activate the transmission at the operation 130.
  • the UE 102 transmits the SRS resource with RE mapping on each symbol based on the determined transmission comb offset value for each given symbol at an operation 140.
  • the gNB can use the usage of an SRS resource set to indicate that the SRS resources contained in that SRS resource set are used for uplink positioning.
  • the UE can be configured with an SRS resource set by higher layer parameter SRS-ResourceSet.
  • the UE can be configured with K ⁇ 1 SRS resources through higher layer parameter SRS-Resource.
  • the SRS resource set is configured with higher layer parameter usage in SRS-ResourceSet to indicate the usage applicability of the SRS resources contained in that set.
  • One value of usage, for example, ‘positioning’ can indicate that the SRS resource set is applicable for positioning.
  • the following SRS parameters are configured: number of SRS antenna ports, number of OFDM symbols in the SRS resources, N s , repetition factor R ⁇ N s , transmission comb value: the example value can be 2, 4, 6, 8 and 12, transmission comb offset for the first symbol within one repetition, and/or transmission comb offset pattern for symbols within one repetition.
  • the UE determines the transmission comb offset value for each OFDM symbol of R OFDM symbols within each repetition in that SRS resource.
  • the transmission comb offset values on different OFDM symbols within each repetition would be different.
  • the UE transmits each SRS antenna port with determined transmission comb offset on each OFDM symbol on the same set of subcarriers on those R consecutive OFDM symbols within one repetition.
  • FIG. 6 illustrates a procedure of SRS transmission for positioning according to the methods of some embodiments in this disclosure.
  • transmission comb offset ⁇ that can take value of 0, 1, ..., ⁇ -1, and a repetition factor R ⁇ 1 at operations 210 and 220
  • the UE can determine the transmission comb offset value for each OFDM symbol within one repetition with R consecutive OFDM symbols at an operation 230 as follows. For the first OFDM symbol among those R consecutive OFDM symbols in one repetition, the transmission comb offset value is ⁇ .
  • the transmission comb offset value is mod ( ⁇ +r-1, ⁇ ) .
  • the transmission comb offset value is mod ( ⁇ -r+1, ⁇ ) .
  • transmission comb offset ⁇ that can take value of 0, 1, ..., ⁇ -1, and a repetition factor R ⁇ 1
  • the UE can determine the transmission comb offset value for each OFDM symbol within one repetition with R consecutive OFDM symbols as follows. For the first OFDM symbol among those R consecutive OFDM symbols in one repetition, the transmission comb offset value is ⁇ .
  • the UE can determine the transmission comb offset value for each OFDM symbol based on a configured transmission comb value, transmission comb offset configured for the first symbol within one repetition and the location of each symbol within one repetition.
  • transmission comb offset ⁇ that can take value of 0, 1, ..., ⁇ -1, and a repetition factor R ⁇ 1
  • the UE can determine the transmission comb offset value for each OFDM symbol within one repetition with R consecutive OFDM symbols as follows.
  • the transmission comb offset value is ⁇ .
  • the UE determine the transmission comb offset value for it as For the third OFDM symbol among those R consecutive OFDM symbols in one repetition, the UE determine the transmission comb offset value for it as For the third OFDM symbol among those R consecutive OFDM symbols in one repetition, the UE determine the transmission comb offset value for it as And so, on so forth.
  • the transmission comb offset value is ⁇ .
  • the transmission comb offset values are mod ( ⁇ +2, ⁇ ) , mod ( ⁇ +1, ⁇ ) , mod ( ⁇ +3, ⁇ ) , ⁇ , mod ( ⁇ +2, ⁇ ) ..., respectively.
  • the transmission comb offset value is ⁇ .
  • the transmission comb offset values are mod ( ⁇ +3, ⁇ ) , mod ( ⁇ +1, ⁇ ) , mod ( ⁇ +4, ⁇ ) , mod ( ⁇ +2, ⁇ ) , mod ( ⁇ +5, ⁇ ) , ⁇ ..., respectively.
  • the transmission comb offset value is ⁇ .
  • the transmission comb offset values are mod ( ⁇ +4, ⁇ ) , mod ( ⁇ +2, ⁇ ) , mod ( ⁇ +6, ⁇ ) , mod ( ⁇ +1, ⁇ ) , mod ( ⁇ +5, ⁇ ) , mod ( ⁇ +3, ⁇ ) , mod ( ⁇ +7, ⁇ ) , ⁇ ..., respectively.
  • the transmission comb offset value is ⁇ .
  • the transmission comb offset values are mod ( ⁇ +6, ⁇ ) , mod ( ⁇ +3, ⁇ ) , mod ( ⁇ +9, ⁇ ) , mod ( ⁇ +1, ⁇ ) , mod ( ⁇ +7, ⁇ ) , mod ( ⁇ +4, ⁇ ) , mod ( ⁇ +10, ⁇ ) , mod ( ⁇ +2, ⁇ ) , mod ( ⁇ +8, ⁇ ) , mod ( ⁇ +5, ⁇ ) , mod ( ⁇ +11, ⁇ ) , ⁇ ..., respectively.
  • the UE can determine the transmission comb offset value for each OFDM symbol based on the configured transmission comb value and the value of repetition factor R.
  • transmission comb offset ⁇ that can take value of 0, 1, ..., ⁇ -1, and a repetition factor R ⁇ 1
  • the UE can determine the transmission comb offset value for each OFDM symbol within one repetition with R consecutive OFDM symbols as follows.
  • the transmission comb offset value is ⁇ .
  • the transmission comb offset value is mod ( ⁇ + ⁇ , ⁇ ) , where ⁇ is calculated based on the configured transmission comb ⁇ and the configured repetition factor R.
  • ⁇ is:
  • One alternative is to use variable ⁇ for different symbol location and for example, the transmission comb offset for the four consecutive symbols in one repetition are: mod ( ⁇ + (0, 2, 3, 4, 6, 7, 8, 10) , ⁇ 12) , respectively.
  • the UE can determine the transmission comb offset value for each OFDM symbol based on one or more of the following parameters: a configured transmission comb value, the location of each symbol within one repetition, the cell ID of the serving cell, the UE ID, and/or a scrambling ID configured by higher layer parameter.
  • transmission comb offset ⁇ that can take value of 0, 1, ..., ⁇ -1, and a repetition factor R ⁇ 1
  • the UE can determine the transmission comb offset value for each OFDM symbol within one repetition with R consecutive OFDM symbols as follows based on the cell ID of the serving cell. For the first OFDM symbol among those R consecutive OFDM symbols in one repetition, the transmission comb offset value is ⁇ .
  • the transmission comb offset for each OFDM symbol within a repetition is explicitly configured through higher layer parameters.
  • the UE can be requested to apply the corresponding configured transmission comb offset for RE mapping in each of the OFDM symbols.
  • a list of transmission comb offset values is configured in higher layer parameter SRS-Resource: ⁇ 1 , ⁇ 2 , ⁇ 3 , ..., ⁇ R ⁇ .
  • the UE can apply the transmission comb offset ⁇ 1 , ⁇ 2 , ⁇ 3 , ..., ⁇ R ⁇ on each of the OFDM symbols within one repetition of R consecutive OFDM symbols. If the SRS resource is not configured for positioning usage, for the transmission in that SRS resource, the UE can apply the transmission comb offset ⁇ 1 ⁇ on every OFDM symbol within one repetition of R consecutive OFDM symbols.
  • a transmission comb offset ⁇ and a list of inter-symbol offset of transmission comb offset ⁇ 2 , ⁇ 3 , ..., ⁇ R ⁇ are configured in higher layer parameter SRS-Resource. If the SRS resource is configured for positioning usage, for the transmission in that SRS resource, the UE can apply the transmission comb offset ⁇ , mod ( ⁇ + ⁇ 2 , ⁇ ) , ..., mod ( ⁇ + ⁇ R , ⁇ ) ⁇ on each of the OFDM symbols within one repetition of R consecutive OFDM symbols. If the SRS resource is not configured for positioning usage, for the transmission in that SRS resource, the UE can apply the transmission comb offset ⁇ on every OFDM symbol within one repetition of R consecutive OFDM symbols.
  • the methods of SRS transmission for uplink positioning are proposed.
  • the SRS transmission can be used for measuring uplink relative time of arrival (RTOA) , angle of arrival (AoA) , uplink reference signal received power (RSRP) and Rx-Tx time difference.
  • RTOA uplink relative time of arrival
  • AoA angle of arrival
  • RSRP uplink reference signal received power
  • Rx-Tx time difference In an SRS resource for positioning, within each SRS symbol repetition, each SRS antenna port is mapped to the same set of subcarriers but with different Comb offsets on different symbols.
  • the UE determines the RE mapping method based on the SRS set usage and for an SRS resource configured in SRS resource set used for positioning, the UE maps the SRS signal within each symbol repetition based on various pre-configured or configured transmission comb offset pattern.
  • the transmission comb offset pattern can be a function of UE ID, SRS sequence ID, cell ID or scrambling ID.
  • the transmission comb offset pattern can be a function of transmission comb value and SRS repetition factor.
  • One method of an embodiment is each SRS resource is configured with a transmission comb offset pattern for RE mapping within a symbol repetition.
  • SRS sounding reference signal
  • RTOA uplink relative time of arrival
  • UE user equipment
  • FIG. 10 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software.
  • FIG. 10 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated.
  • RF radio frequency
  • the application circuitry 730 may include a circuitry, such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include any combinations of general-purpose processors and dedicated processors, such as graphics processors and application processors.
  • the processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.
  • the baseband circuitry 720 may include a circuitry, such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include a baseband processor.
  • the baseband circuitry may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry.
  • the radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc.
  • the baseband circuitry may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) .
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency.
  • baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network.
  • the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency.
  • RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitry.
  • “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC) , an electronic circuit, a processor (shared, dedicated, or group) , and/or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC) .
  • the memory/storage 740 may be used to load and store data and/or instructions, for example, for system.
  • the memory/storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM) ) , and/or non-volatile memory, such as flash memory.
  • the I/O interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system.
  • User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc.
  • Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface.
  • USB universal serial bus
  • the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system.
  • the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit.
  • the positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
  • the display 750 may include a display, such as a liquid crystal display and a touch screen display.
  • the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, etc.
  • system may have more or less components, and/or different architectures.
  • methods described herein may be implemented as a computer program.
  • the computer program may be stored on a storage medium, such as a non-transitory storage medium.
  • the units as separating components for explanation are or are not physically separated.
  • the units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments.
  • each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
  • the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer.
  • the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product.
  • one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product.
  • the software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure.
  • the storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.

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Abstract

L'invention concerne des procédés et des appareils de transmission de signaux de référence de sondage (SRS). Un procédé d'une transmission de SRS d'un équipement utilisateur (UE) comprend la réception, en provenance d'une station de base (BS), d'informations de configuration de motif de décalage de peigne de transmission pour une ressource de SRS utilisée pour le positionnement, et la transmission, à la BS, de la ressource de SRS dans un ensemble de ressources de SRS avec un décalage de peigne de transmission déterminé en fonction des informations de configuration du motif de décalage de peigne de transmission pour la ressource de SRS utilisée pour le positionnement. Le procédé de transmission de SRS peut améliorer les performances d'une mesure de temps d'arrivée relative (RTOA) de liaison montante qui est destinée à un positionnement d'UE.
PCT/CN2020/101733 2019-07-22 2020-07-13 Procédés et appareils de transmission de signaux de référence de sondage WO2021012981A1 (fr)

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