WO2021176783A1 - 無線基地局および無線端末 - Google Patents

無線基地局および無線端末 Download PDF

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Publication number
WO2021176783A1
WO2021176783A1 PCT/JP2020/044869 JP2020044869W WO2021176783A1 WO 2021176783 A1 WO2021176783 A1 WO 2021176783A1 JP 2020044869 W JP2020044869 W JP 2020044869W WO 2021176783 A1 WO2021176783 A1 WO 2021176783A1
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WO
WIPO (PCT)
Prior art keywords
base station
radio base
information
cooperative
radio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/044869
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English (en)
French (fr)
Japanese (ja)
Inventor
田中　健
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.)
Sony Group Corp
Original Assignee
Sony Group Corp
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 Sony Group Corp filed Critical Sony Group Corp
Priority to JP2022504974A priority Critical patent/JPWO2021176783A1/ja
Priority to EP20922667.9A priority patent/EP4099746A4/en
Priority to CN202080097585.7A priority patent/CN115152266A/zh
Priority to US17/802,958 priority patent/US12335951B2/en
Publication of WO2021176783A1 publication Critical patent/WO2021176783A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025043076A priority patent/JP2025089342A/ja
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • 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
    • H04L25/0204—Channel estimation of multiple channels
    • 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
    • H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency

Definitions

  • CJT Coherent Joint Transmission
  • NCJT Non-Coherent Joint Transmission
  • coordinated nulling Non-Coherent Joint Transmission
  • All of these can realize higher system throughput in an environment where a plurality of APs exist than when the plurality of APs do not cooperate with each other.
  • the radio control unit may arrange the allocation of the reference signal in the coordinated transmission with the coordinated radio base station prior to the generation of the reference signal. This has the effect of arranging the allocation of the reference signal in the cooperative transmission prior to the generation of the reference signal.
  • the third aspect of the present technology is a channel estimation unit that separates a reference signal from signals co-transmitted from a plurality of radio base stations based on reference information and estimates a frequency error between the plurality of radio base stations.
  • the wireless terminal includes the signal processing unit that compensates for the phase shift of the coordinatedly transmitted signal based on the estimated frequency error. This has the effect of estimating the frequency error from the coordinated transmitted signal and performing phase shift compensation.
  • the decision-maker of the cooperation method of the multi-AP is defined as the master AP
  • the access point that implements the cooperation method by the notification from the master AP is defined as the slave AP.
  • the master AP may be called a sharing AP
  • the slave AP may be called a shared AP.
  • the master AP may be involved in a multi-AP cooperative scheme.
  • the access point 11 may be a master AP and the access point 12 may be a slave AP.
  • the access point 11 is referred to as a master AP 101 and the access point 12 is referred to as a slave AP 102, but the slave AP may be a plurality of access points.
  • the power supply unit 322 is composed of a battery power source or a fixed power source, and supplies electric power to each unit of the wireless communication device 300.
  • Capability exchange First, the master AP 101, the slave AP 102, and the wireless terminal 201 notify each other whether simultaneous transmission by the multi-AP is possible. This is referred to as Capability Exchange 810. Specifically, it is notified that the master AP 101 and the slave AP 102 can transmit by simultaneous transmission, and the wireless terminal 201 can receive the signal transmitted by simultaneous transmission. Of the simultaneous transmissions (Joint Transmission), CJT (Coherent Joint Transmission) or NCJT (Non-Coherent Joint Transmission) may be notified of information indicating whether or not transmission and reception are possible, respectively.
  • simultaneous transmissions Joint Transmission
  • CJT Coherent Joint Transmission
  • NCJT Non-Coherent Joint Transmission
  • the capability exchange 810 is an example of the communication unit described in the claims.
  • Pilot Allocation negotiation After being notified by the capability exchange 810 that transmission by simultaneous transmission is possible between the multi-AP and the wireless terminal 201, the master AP 101 determined to perform simultaneous transmission by the multi-AP tells the slave AP 102. Notify information for determining the allocation of pilot signals (821). Upon receiving the notification 821 from the master AP 101, the slave AP 102 notifies the master AP 101 of information for determining the allocation of the pilot signal (822). The exchange of these arrangements is referred to as Pilot Allocation Negotiation 820.
  • each access point constituting the multi-AP allocates the pilot signal determined by the pilot signal allocation negotiation 820 when performing simultaneous transmission (830).
  • the data to be transmitted to the wireless terminal 201 may be shared between the multi-APs and the frequency synchronization between the multi-APs may be performed.
  • the simultaneous transmission 840 is an example of the communication unit described in the claims.
  • the "destination address” includes information indicating the terminal that is the destination of this frame. For example, information indicating the MAC address of the destination terminal may be included, but if a specific plurality of terminals or all terminals capable of receiving this frame are the destination terminals, the information may be received by those terminals. The information to be shown may be included.
  • the "source address” (RA) includes information indicating a terminal that is the source of this frame. Similar to the "destination address", information indicating the MAC address of the source may be included.
  • the "Frame Control” includes information indicating that this frame is a frame notified by the capability exchange 810. However, it does not have to be included only in the "frame control", and it is configured to indicate that this frame is a frame notified as capability exchange 810 by combining with other information in this frame. You may.
  • EHT Capabilities includes information indicating the ability of the wireless communication device to transmit this frame, and particularly includes information indicating whether simultaneous transmission is possible.
  • This "EHT capability” includes, but is not limited to, at least one of the "element ID”, "length” and "EHT capability information”.
  • the "joint transmission" of the "EHT capability information” includes information indicating whether or not the simultaneous transmission can be performed.
  • the “simultaneous transmission” may include information indicating in detail whether or not the implementation is possible for some methods. For example, when “simultaneous transmission” is represented by 3 bits, “000” indicates that simultaneous transmission cannot be performed regardless of the method. "010” indicates that only NCJT can be received among simultaneous transmissions. "011” indicates that NCJT can be transmitted and received among simultaneous transmissions. "100” indicates that only transmission can be performed regardless of CJT or NCJT. "101” may be configured to indicate that both transmission and reception can be performed regardless of CJT or NCJT.
  • the “element ID” (Element ID) includes information indicating that this element is a “simultaneous transmission control element”. "Length” contains information indicating the length of this element.
  • the “number of simultaneous transmission terminals” (JTSTANum) includes information indicating the number of "terminal information” fields in the subsequent "simultaneous transmission notification element”.
  • the “Channel ID” includes information indicating a frequency band of interest indicated by the “Channel” subfield.
  • the “allocation type” includes information indicating the allocation of the pilot signal to any access point constituting the multi-AP in the frequency band indicated by the “channel ID”.
  • the "terminal information” includes at least one subfield of "BSSID” and "channel”.
  • BSSID includes information indicating different wireless terminals.
  • the "Channel” includes information indicating a frequency band assigned at the time of simultaneous transmission to the wireless terminal indicated by "BSSID”.
  • “Frame Control” includes information indicating that this frame is a frame notified as Ac 860. “Length” includes information indicating the length of the frame. The “source address” (RA) includes information indicating the wireless terminal 201 that is the source. The “Residual CFO Feedback” includes information indicating the residual CFO for any access point constituting the multi-AP. “FCS” (Frame Check Sequence) includes a sequence necessary for performing error detection or error correction for the received frame.
  • the phase tracking 850 can be performed in the wireless terminal 201 that receives the information. .. Further, by notifying the residual CFO generated in the wireless terminal 201 together with the Ac 860, the frequency error compensation 870 can be performed in the multi-AP.
  • FIG. 9 is a diagram showing a modified example of the data unit configuration notified by the simultaneous transmission 840 in the embodiment of the present technology.
  • FIG. 10 is a diagram showing an example of allocating a pilot signal according to an embodiment of the present technology. The figure shows a plurality of OFDM symbols that make up the "data" section.
  • the present technology can have the following configurations.
  • a radio control unit that generates a reference signal agreed with a cooperative radio base station that performs cooperative transmission, and A radio base station including a communication unit that cooperates with the cooperative radio base station to transmit a signal including the reference signal to a radio terminal.
  • the communication unit exchanges information on a cooperative method that can be supported prior to the cooperative transmission between the cooperative radio base station and the wireless terminal. Station.
  • the radio control unit describes any of (1) to (3) above, in which the allocation of the reference signal in the coordinated transmission is arranged with the coordinated radio base station prior to the generation of the reference signal.
  • Radio base station (5) The radio base station according to (4) above, wherein the reference signal allocation arrangement unit determines information for each frequency channel and information regarding the frequency channel among the frequency bands used in the cooperation method.
  • the radio control unit decides on at least one of information regarding the number of the coordinated radio base stations, information for identifying the coordinated radio base station, and information including a number assigned to the coordinated radio base station (4). Or the radio base station according to (5).

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2020/044869 2020-03-04 2020-12-02 無線基地局および無線端末 Ceased WO2021176783A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2022504974A JPWO2021176783A1 (https=) 2020-03-04 2020-12-02
EP20922667.9A EP4099746A4 (en) 2020-03-04 2020-12-02 WIRELESS BASE STATION AND WIRELESS TERMINAL
CN202080097585.7A CN115152266A (zh) 2020-03-04 2020-12-02 无线基站和无线终端
US17/802,958 US12335951B2 (en) 2020-03-04 2020-12-02 Wireless base station and wireless terminal
JP2025043076A JP2025089342A (ja) 2020-03-04 2025-03-18 無線基地局および無線端末

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-036688 2020-03-04
JP2020036688 2020-03-04

Publications (1)

Publication Number Publication Date
WO2021176783A1 true WO2021176783A1 (ja) 2021-09-10

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PCT/JP2020/044869 Ceased WO2021176783A1 (ja) 2020-03-04 2020-12-02 無線基地局および無線端末

Country Status (6)

Country Link
US (1) US12335951B2 (https=)
EP (1) EP4099746A4 (https=)
JP (2) JPWO2021176783A1 (https=)
CN (1) CN115152266A (https=)
TW (1) TW202142042A (https=)
WO (1) WO2021176783A1 (https=)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022209213A1 (ja) * 2021-03-30 2022-10-06 ソニーグループ株式会社 無線通信装置および方法
WO2022222154A1 (zh) * 2021-04-23 2022-10-27 北京小米移动软件有限公司 请求发送、请求接收方法和装置
CN120021185A (zh) * 2023-11-17 2025-05-20 华为技术有限公司 通信方法和通信装置

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See also references of EP4099746A4

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Publication number Publication date
JP2025089342A (ja) 2025-06-12
US20230098215A1 (en) 2023-03-30
CN115152266A (zh) 2022-10-04
EP4099746A1 (en) 2022-12-07
TW202142042A (zh) 2021-11-01
EP4099746A4 (en) 2023-10-04
JPWO2021176783A1 (https=) 2021-09-10
US12335951B2 (en) 2025-06-17

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