WO2025123751A9 - Procédés et appareils pour une amélioration de performance de liaison montante dans une architecture de réseau d'accès radio (ran) à division de couche inférieure (lls) - Google Patents

Procédés et appareils pour une amélioration de performance de liaison montante dans une architecture de réseau d'accès radio (ran) à division de couche inférieure (lls)

Info

Publication number
WO2025123751A9
WO2025123751A9 PCT/CN2024/113302 CN2024113302W WO2025123751A9 WO 2025123751 A9 WO2025123751 A9 WO 2025123751A9 CN 2024113302 W CN2024113302 W CN 2024113302W WO 2025123751 A9 WO2025123751 A9 WO 2025123751A9
Authority
WO
WIPO (PCT)
Prior art keywords
srs
configuration
resource
lls
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/113302
Other languages
English (en)
Other versions
WO2025123751A1 (fr
Inventor
Shuigen Yang
Bingchao LIU
Mingzeng Dai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lenovo Beijing Ltd
Original Assignee
Lenovo Beijing Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lenovo Beijing Ltd filed Critical Lenovo Beijing Ltd
Priority to PCT/CN2024/113302 priority Critical patent/WO2025123751A1/fr
Publication of WO2025123751A1 publication Critical patent/WO2025123751A1/fr
Publication of WO2025123751A9 publication Critical patent/WO2025123751A9/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • a wireless communications system may include one or multiple network communication devices, such as a base station (BS) , which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g. time-domain resources (e.g. symbols, slots, subframes, frames, or the like) or frequency-domain resources (e.g. subcarriers, carriers, or the like) .
  • the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g. sixth generation (6G) ) .
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions.
  • an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.
  • a "set" may include one or more elements.
  • the first BS includes at least one memory; and at least one processor coupled to the at least one memory and configured to cause the first BS to: generate a sounding reference signal (SRS) configuration for at least one user equipment (UE) ; and transmit the SRS configuration to a second BS over an lower layer split (LLS) interface between the first BS and the second BS, wherein the SRS configuration is used by the second BS to perform an SRS channel estimation (CE) operation for the at least one UE.
  • SRS sounding reference signal
  • UE user equipment
  • LLS lower layer split
  • a first SRS resource within the at least one SRS resource is used by two or more UEs within the at least one UE to generate two or more SRS sequences.
  • the at least one SRS resource includes spatial domain related information
  • the spatial domain related information includes at least one of the following: a configuration of spatial relation between a reference reference-signal (RS) and an SRS; or a configuration of a transmission configuration indicator (TCI) state of the at least one SRS resource.
  • RS reference reference-signal
  • TCI transmission configuration indicator
  • the TCI state associates one or two downlink (DL) reference signals with a quasi-colocation type.
  • the at least one processor is configured to cause the first BS to receive first information from the second BS, and the first information indicates at least one of the following: the second BS is capable to perform the SRS CE operation; or the second BS is not capable to perform the SRS CE operation.
  • the at least one processor is configured to cause the first BS to receive SRS channel information for the at least one UE from the second BS over the LLS interface.
  • the SRS channel information includes at least one of the following: a signal to interference plus noise ratio (SINR) ; a timing advance (TA) value between the second BS and the at least one UE; or one or more channel coefficients per physical resource block (PRB) .
  • SINR signal to interference plus noise ratio
  • TA timing advance
  • PRB physical resource block
  • At least one of the SRS configuration or the SRS channel information is carried in a section type message over the LLS interface.
  • Some implementations of the present disclosure provide a processor for wireless communication, comprising at least one controller coupled with at least one memory and configured to cause the processor to: generate a sounding reference signal (SRS) configuration for at least one user equipment (UE) ; and transmit the SRS configuration to a base station (BS) over an lower layer split (LLS) interface between the processor and the BS, wherein the SRS configuration is used by the BS to perform an SRS channel estimation (CE) operation for the at least one UE.
  • SRS sounding reference signal
  • UE user equipment
  • LLS lower layer split
  • the first BS includes at least one memory; and at least one processor coupled to the at least one memory and configured to cause the first BS to: receive a sounding reference signal (SRS) configuration for at least one user equipment (UE) from a second BS over an lower layer split (LLS) interface between the first BS and the second BS, wherein the SRS configuration is used by the first BS to perform an SRS channel estimation (CE) operation for the at least one UE; receive an SRS sequence from the at least one UE; and perform the SRS CE operation based on the received SRS sequence to determine SRS channel information for the at least one UE.
  • SRS sounding reference signal
  • UE user equipment
  • LLS lower layer split
  • CE SRS channel estimation
  • a first SRS resource within the at least one SRS resource is used by two or more UEs within the at least one UE to generate two or more SRS sequences.
  • the at least one SRS resource includes time domain related information
  • the time domain related information includes at least one of the following: a starting symbol in a slot; a total number of symbols for an SRS sequence transmission of the at least one UE; a total number of repetitions for an SRS transmission occasion of the at least one UE; a periodicity of the at least one SRS resource, and an offset corresponding to the periodicity for a periodic and semi-persistent SRS, wherein the periodicity and the offset are given in a total number of slots; or an offset between downlink control information (DCI) triggering an SRS transmission by the at least one UE and a slot for a reception of an SRS sequence, if the at least one SRS resource is associated with an aperiodic SRS.
  • DCI downlink control information
  • the at least one SRS resource includes frequency domain related information
  • the frequency domain related information includes at least one of the following: an identifier (ID) of a resource block; a resource element mask within the resource block; or information used to determine a length of an SRS sequence for a partial frequency sounding, and the SRS sequence is generated by the UE based on the at least one SRS resource.
  • ID an identifier
  • the SRS sequence is generated by the UE based on the at least one SRS resource.
  • the at least one SRS resource includes at least one of the following: hopping finer granularity enabling finer granular hopping, and a set of cyclic shifts, if the SRS configuration is associated with cyclic shift hopping; a time-domain behaviour for a total number of repetitions for an SRS transmission occasion of the at least one UE, and a set of comb offsets, if the at least one SRS resource is associated with comb offset hopping; or a total number of one or more cyclic shifts for an antenna port, where a cyclic shift within the one or more cyclic shifts is associated with an identifier (ID) of the at least one UE.
  • ID identifier
  • the at least one SRS resource includes spatial domain related information
  • the spatial domain related information includes at least one of the following: a configuration of spatial relation between a reference reference-signal (RS) and an SRS; or a configuration of a transmission configuration indicator (TCI) state of the at least one SRS resource.
  • RS reference reference-signal
  • TCI transmission configuration indicator
  • the section type message includes at least one of the following: a first indicator for indicating a type of the SRS channel information; a second indicator for indicating that the one or more channel coefficients per PRB are included in the section type message; a first section extension including the one or more channel coefficients per PRB; a second section extension indicating one or more sets of contiguous PRBs that are not used for the SRS CE operation; or a third indicator for indicating the one or more sets of contiguous PRBs that are not used for the SRS CE operation.
  • the first BS is a radio unit (RU) hosting low physical layers
  • the second BS is a distributed unit (DU) hosting high physical layers.
  • FIG. 3 illustrates an example of a network equipment (NE) 300 in accordance with some aspects of the present disclosure.
  • Figure 4 illustrates a diagram of a logical architecture of an LLS RAN in accordance with some aspects of the present disclosure.
  • Figure 7 illustrates a flowchart of a method for receiving an SRS configuration in accordance with some aspects of the present disclosure.
  • Some embodiments of the present disclosure introduce a section type in an SRS configuration message to convey a UE specific SRS configuration.
  • the UE specific SRS configuration includes the cyclic shift and the corresponding UE ID.
  • Other SRS configurations may be common for multiple UEs.
  • the SRS report may include SRS channel information, where each element in the SRS channel information is associated with the corresponding UE ID.
  • the controller 202 may be configured to fetch (e.g. obtain, retrieve, receive) instructions from the memory 204 and determine subsequent instruction (s) to be executed to cause the processor 200 to support various operations in accordance with examples as described herein.
  • the controller 202 may be configured to track memory address of instructions associated with the memory 204.
  • the controller 202 may be configured to decode instructions to determine the operation to be performed and the operands involved.
  • the controller 202 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 200 to cause the processor 200 to support various operations in accordance with examples as described herein.
  • the controller 202 may be configured to manage flow of data within the processor 200.
  • the controller 202 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 200.
  • ALUs arithmetic logic units
  • a receiver chain 310 may be configured to receive signals (e.g. control information, data, packets) over a wireless medium.
  • the receiver chain 310 may include one or more antennas for receive the signal over the air or wireless medium.
  • the receiver chain 310 may include at least one amplifier (e.g. a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receiver chain 310 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal.
  • the receiver chain 310 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
  • BS #1 may receive, from BS #2, information (denoted as information #1) which indicates at least one of the following:
  • startPrb an index of the starting PRB of the data section description, i.e., the initial PRB.
  • - numPrb a total number of contiguous PRBs per data section description.
  • the combOffset has the value range [0 ...1] for the reception comb type 2, value range [0 ...3] for the reception comb type 4, and value range [0 ...7] for the reception comb type 8.
  • startRbIndexAndFreqScalingFactor may be further included which is to be used to determine the length of the SRS sequence for partial frequency sounding.
  • hoppingFinerGranularity The hopping finer granularity is given by hoppingFinerGranularity.
  • hoppingSubset The set of cyclic shifts or the set of comb offsets is given by hoppingSubset: if the hoppingFinerGranularity is include, the hoppingSubset indicates the set of cyclic shifts; otherwise, if the hoppingWithRepetition is included, the hoppingSubset indicates the set of comb offsets.
  • the RU may receive one or more SRS sequences from a UE (and/or one or more other UEs not shown in Figure 8) after operation 801.
  • the RU may receive one or more SRS sequences from the UE at 803A before operation 802.
  • the RU may receive one or more SRS sequences from the UE at 803B after operation 802.
  • the SRS channel information includes SINR and/or "a TA value between the RU and the UE. " The SINR and/or the TA value may be calculated based on each SRS resource reception occasion.
  • the SRS channel information includes the channel coefficients (in-phase quadrature (IQ) sample) for specific PRBs for an SRS resource reception occasion.
  • the SRS channel information can be the wideband channel coefficients for all the PRBs for the SRS resources, or the SRS channel information can be the sub-band channel coefficients for all the PRBs, wherein every two of four PRBs may have a set of channel coefficients.
  • an indicator is included in the SRS report at 805, to indicate the type of the SRS channel information.
  • the indicator includes 2 bits, where the value 01 indicates that the SINR is included, value 10 indicates that the TA value is included, and value 11 indicates that both the SINR and the TA value are included.
  • the SRS report may further include the channel coefficients per PRB.
  • an indicator may be included in the SRS report, to indicate that the channel coefficients are further included.
  • - startSymbolID indicates the starting symbol used for the CE, i.e., the initial symbol.
  • - startPrb indicates the starting PRB used for the CE, i.e., the initial PRB.
  • - numPrb indicates the number of contiguous PRBs used for the CE.
  • channelEstimationReport indicates channel estimation information of the corresponding UE, e.g. the SINR and/or the TA value.
  • the SRS report may include the SRS channel information for multiple UEs (i.e. multiple CE reports) , where each CE report is associated with one UE ID of these multiple UEs.
  • the "mf" in the SRS report associated with the UE indicates whether the channel coefficients are further provided for the corresponding UE. For example, value 0 of mf indicates that no channel coefficient is further included in the SRS report, while value 1 of mf indicates that that one or more channel coefficients are further included in the SRS report.
  • a new section extension type e.g. Section Extension M as below
  • Section Type Y i.e. the SRS report
  • a section extension includes the parameters that apply to the Section Type Y beyond those within the Section Type Y.
  • the channel coefficients may be provided per PRB and per antenna in Section Extension M.
  • Section Extension M may include IQ samples per antenna of each PRB, e.g. ciIsample and ciQsample as below.
  • Embodiment #2 provides solutions for non-contiguous PRB channel report by a RU, where the RU can report a part of PRB’s channel coefficients but not all PRBs in order to reduce the traffic over the LLS interface.
  • Operations 801, 802, 803 and 804 in Embodiment #2 are the same as the operations 801, 802, 803 and 804 in Embodiment #1.
  • the RU may report the SRS channel information for the UE by sending an SRS report to the DU.
  • the detailed description of the SRS report shown in Format #2 of Embodiment #1 as described above may be applicable here in Embodiment #2.
  • Embodiment #2 To support the non-contiguous PRB channel report, the following two solutions are supported in Embodiment #2.
  • Solution #1 If one or more PRBs are not used for the SRS CE, the RU provides the channel coefficients of the one or more PRBs (e.g. Section Extension M as shown above) with a default value, e.g. value 0. For example, in Section Extension M conveying the channel coefficients per PRB, the channel coefficients are set to value 0. On receipt of the channel coefficients with value 0, the DU may determine that the corresponding one or more PRBs are not used for the SRS CE.
  • Section Extension M conveying the channel coefficients per PRB
  • the DU On receipt of the channel coefficients with value 0, the DU may determine that the corresponding one or more PRBs are not used for the SRS CE.
  • Solution #2 A new section extension type (e.g. Section Extension P as below) (i.e. the IE of "Section Extensions for providing additional report as indicated by 'mf' in previous report” ) is included in the SRS report (i.e. Section Type Y) , to provide one or more PRBs that are not used for the SRS CE.
  • Section Extension P includes the following fields or IEs.
  • offStartPrb indicates the starting PRB (i.e., the first or initial PRB) within the contiguous PRBs that is not used for the SRS CE.
  • - numOffStartPrb indicates the total number of PRBs within the contiguous PRBs that are not used for the SRS CE.
  • the DU may determine that the corresponding PRBs are not used for the SRS CE.
  • the total line number of Section Extension P may be varied due to different total number of PRBs according to different embodiments.
  • Section Extension P which includes two sets of "offStartPrb and numOffStartPrb"
  • the DU can determine that PRB #5, PRB #6 and PRB #7 within the contiguous PRBs are not used for the SRS CE for the corresponding UE.

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

Abstract

La présente invention divulgue des procédés et des appareils pour une amélioration de performance de liaison montante dans une architecture RAN à division de couche inférieure (LLS). Le procédé mis en œuvre par une première station de base (BS) comprend les étapes suivantes consistant à : recevoir une configuration de signal de référence de sondage (SRS) pour au moins un équipement utilisateur (UE) depuis une seconde BS sur l'interface LLS entre la première BS et la seconde BS, la configuration de SRS étant utilisée par la première BS pour effectuer une opération d'estimation de canal SRS (CE) pour le ou les UE ; recevoir une séquence de SRS depuis le ou les UE ; et exécuter l'opération de CE de SRS sur la base de la séquence de SRS reçue pour déterminer des informations de canal de SRS pour le ou les UE.
PCT/CN2024/113302 2024-08-20 2024-08-20 Procédés et appareils pour une amélioration de performance de liaison montante dans une architecture de réseau d'accès radio (ran) à division de couche inférieure (lls) Pending WO2025123751A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/113302 WO2025123751A1 (fr) 2024-08-20 2024-08-20 Procédés et appareils pour une amélioration de performance de liaison montante dans une architecture de réseau d'accès radio (ran) à division de couche inférieure (lls)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/113302 WO2025123751A1 (fr) 2024-08-20 2024-08-20 Procédés et appareils pour une amélioration de performance de liaison montante dans une architecture de réseau d'accès radio (ran) à division de couche inférieure (lls)

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WO2025123751A1 WO2025123751A1 (fr) 2025-06-19
WO2025123751A9 true WO2025123751A9 (fr) 2025-08-21

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Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
KR101674315B1 (ko) * 2015-08-18 2016-11-08 서울대학교산학협력단 분산 안테나 구조의 무선 통신 시스템에서 채널 추정 방법
US11956041B2 (en) * 2022-04-22 2024-04-09 At&T Intellectual Property I, L.P. Massive multiple-input-multiple-output (MIMO) uplink enhancement in split radio access network (RAN) deployments
EP4535691A4 (fr) * 2022-06-23 2025-09-03 Samsung Electronics Co Ltd Dispositif et procédé de transmission fronthaul dans un système de communication sans fil
WO2024025172A1 (fr) * 2022-07-24 2024-02-01 삼성전자주식회사 Dispositif électronique et procédé pour mettre en œuvre une configuration de srs dans une interface fronthaul
WO2024161343A1 (fr) * 2023-02-01 2024-08-08 Telefonaktiebolaget Lm Ericsson (Publ) Saut à décalage en peigne et à décalage cyclique srs combinés/séparés

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