WO2021199843A1 - Équipement terminal pour l'exécution d'une demande de répétition automatique hybride efficace, dispositif de station de base, procédé de commande et programme - Google Patents

Équipement terminal pour l'exécution d'une demande de répétition automatique hybride efficace, dispositif de station de base, procédé de commande et programme Download PDF

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Publication number
WO2021199843A1
WO2021199843A1 PCT/JP2021/007869 JP2021007869W WO2021199843A1 WO 2021199843 A1 WO2021199843 A1 WO 2021199843A1 JP 2021007869 W JP2021007869 W JP 2021007869W WO 2021199843 A1 WO2021199843 A1 WO 2021199843A1
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WIPO (PCT)
Prior art keywords
response
user data
harq
base station
terminal device
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PCT/JP2021/007869
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English (en)
Japanese (ja)
Inventor
大関　武雄
浩輔 山崎
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Kddi株式会社
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Publication of WO2021199843A1 publication Critical patent/WO2021199843A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a terminal device, a base station device, a control method, and a program, and more particularly to a technique for improving the efficiency of a composite automatic repeat request.
  • the 5th generation (5G) wireless communication standard (NR, New Radio) has been established.
  • a compound automatic repeat request (HARQ) is to be applied as a technique for improving the reliability of communication.
  • the terminal device transmits HARQ-ACK (ACK (affirmative response) / NACK (negative response)) indicating whether or not the user data transmitted by the base station device has been successfully received to the base station device.
  • the base station apparatus receives the NACK, the base station apparatus retransmits the user data (data different from the previously transmitted data such as the previously transmitted data and the data of a different redundancy version).
  • 5G wireless communication is expected to be used for applications such as remote control of machines (see Non-Patent Document 1).
  • remote control for example, on the machine side, the state of the own device is grasped by a sensor, and the information on the state obtained by the sensor is notified to the network side (base station device). Then, the network side decides how to move the device based on the notified information, and transmits control data including the decided content to the device. Then, the device drives the actuator based on the received control data to execute a predetermined operation. Then, the sensor measures the state after the operation and notifies the network side, and the above-mentioned processing is repeated.
  • the area of the uplink control channel PUCCH, Physical Uplink Control Channel
  • the proportion of HARQ-ACK will increase, and the PUCCH area may be insufficient.
  • TDD Time Division Duplex
  • a setting with few uplink resources is generally used, so that the PUCCH region may be significantly insufficient.
  • the present invention provides a technique for improving communication efficiency in a system that utilizes a compound automatic repeat request.
  • the terminal device is a composite automatic repeat request (HARQ) for user data received from the base station device based on a communication means for communicating with the base station device and a signal transmitted from the base station device.
  • the HARQ response is transmitted to the user data for which the HARQ response should be transmitted, and the HARQ response is transmitted to the user data for which the HARQ response should not be transmitted. It has a control means for controlling the communication means so as not to transmit.
  • the base station apparatus gives an instruction indicating whether or not a response to a compound automatic repeat request (HARQ) for the user data is unnecessary when transmitting user data to the terminal apparatus.
  • HARQ compound automatic repeat request
  • the communication means for receiving the response from the terminal device and the user data not instructing that the response is unnecessary are received. It has a retransmission control means that executes the retransmission control of the HARQ based on the response and does not execute the retransmission control for the user data instructed that the response is unnecessary.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system.
  • FIG. 2 is a diagram showing a hardware configuration example of a base station device and a terminal device.
  • FIG. 3 is a diagram showing a functional configuration example of the base station apparatus.
  • FIG. 4 is a diagram showing a functional configuration example of the terminal device.
  • FIG. 5 is a diagram showing an example of a processing flow executed in a wireless communication system.
  • FIG. 6 is a diagram showing an example of a processing flow executed in a wireless communication system.
  • FIG. 7 is a diagram showing an example of a processing flow executed in a wireless communication system.
  • FIG. 8 is a diagram showing an example of a processing flow executed in a wireless communication system.
  • FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment.
  • the wireless communication system includes, for example, a base station device 101 and a terminal device 102 in a 5G cellular communication system. It should be noted that this is an example, and the following discussion can be applied to any system in which two communication devices perform wireless communication. Further, although FIG. 1 shows only one base station device 101 and one terminal device 102 for the sake of simplicity, there may naturally be a plurality of these devices.
  • the base station device 101 transmits a signal including user data and the like to the terminal device 102, and the terminal device 102 receives the signal.
  • the terminal device 102 transmits a HARQ response (ACK / NACK) to the base station device 101 in response to the received signal.
  • control data for operating the device is transmitted to the terminal device 102 as user data transmitted from the base station device 101, for example, communication for remote control of the device.
  • the HARQ response is transmitted each time for the frequently transmitted user data, the resources of the uplink control channel (PUCCH) are wasted as described above. Communication efficiency may deteriorate. Therefore, in the present embodiment, the HARQ response is transmitted to some user data, and the HARQ response is not transmitted to other user data.
  • the base station device 101 instructs the terminal device 102 whether or not a HARQ response to the user data is required.
  • a HARQ response to the user data is required.
  • the base station apparatus 101 requires HARQ for the downlink control channel (PDCCH, Physical Downlink Control Channel) that is also transmitted when the downlink data signal (PDSCH, Physical Downlink Shared Channel) is transmitted? It is transmitted including predetermined information (for example, a flag) indicating whether or not it is.
  • a 1-bit area in the PDCCH can be used as information indicating whether or not a HARQ response needs to be transmitted to the PDSCH corresponding to the PDCCH.
  • the terminal device 102 identifies the radio resource to which the PDSCH has been transmitted in the PDCCH, and determines whether or not a HARQ response needs to be transmitted for the PDSCH. Then, the terminal device 102 transmits the HARQ response only to the PDSCH that needs to transmit the HARQ response, and does not transmit the HARQ response to the PDSCH that does not need to transmit the HARQ response. As a result, it is possible to prevent the PUCCH resources from being wasted due to the unnecessary transmission of the HARQ response.
  • the base station apparatus 101 can change the sequence used for scrambling the PDCCH corresponding to the PDSCH, depending on whether or not the HARQ response to the PDSCH needs to be transmitted. For example, the base station apparatus 101 scrambles the corresponding PDCCH for a PDSCH that requires a HARQ response, using the value of the first RNTI (Radio Network Temporary Identifier), and does not require a HARQ response. For PDSCH, the corresponding PDCCH is scrambled using a second RNTI value that is different from the first RNTI.
  • first RNTI Radio Network Temporary Identifier
  • the terminal device 102 determines that a HARQ response is required for the PDSCH corresponding to the PDCCH.
  • the terminal device 102 succeeds in demodulating the PDCCH using the second RNTI, it determines that the PDCCH corresponding to the PDCCH does not require a HARQ response.
  • the base station apparatus 101 can notify the terminal apparatus 102 of the necessity of HARQ without preparing a field indicating the necessity of HARQ in the PDCCH.
  • the base station apparatus 101 may instruct the terminal apparatus 102 whether or not to transmit a HARQ response to the PDSCH, for example, by scheduling the PDSCH using a predetermined method. For example, the base station apparatus 101 schedules PDSCHs that do not require a HARQ response by the Semi-Persistent Scheduling (SPS) method, and schedules PDSCHs that require a HARQ response without using SPS. To. On the contrary, the PDSCH that does not require a HARQ response may be scheduled by SPS, and the PDSCH that requires a HARQ response may be scheduled by another method.
  • SPS Semi-Persistent Scheduling
  • the terminal device 102 prevents the transmission of the HARQ response from being transmitted for the PDSCH received in the radio resource scheduled by the first method (for example, the SPS method) that does not require the transmission of the HARQ response. Further, the terminal device 102 transmits the HARQ response for the PDSCH received by the radio resource scheduled by the second method (for example, a method other than SPS) that requires the transmission of the HARQ response.
  • the first method for example, the SPS method
  • the terminal device 102 transmits the HARQ response for the PDSCH received by the radio resource scheduled by the second method (for example, a method other than SPS) that requires the transmission of the HARQ response.
  • the base station apparatus 101 may notify the terminal apparatus 102 of the necessity of transmitting the HARQ response according to the logical channel transmitted by the PDSCH, for example.
  • the terminal device 102 confirms, for example, the MAC (Medium Access Control) header of the data transmitted by the PDSCH, and determines the logical channel used for transmitting the user data in the PDSCH.
  • the terminal device 102 prevents the transmission of the HARQ response when the determined logical channel is a predetermined logical channel, and when the determined logical channel is not the predetermined logical channel, the HARQ To send the response of.
  • the logical channel can correspond to, for example, the type of application (browsing, VoIP (Voice over Internet Protocol), content download, etc.). Therefore, by the above-mentioned method, HARQ can be prevented from being transmitted for the communication of a specific application, and HARQ can be transmitted for the communication by another application.
  • the base station device 101 can notify the terminal device 102 of the necessity of transmitting the HARQ response as described above. Then, the base station apparatus 101 receives a response from the terminal apparatus 102 for the user data instructing that a HARQ response is required, and executes retransmission control based on the received response. On the other hand, the base station apparatus 101 does not execute the retransmission control for the user data instructed that the HARQ response is unnecessary.
  • FIG. 2 shows a hardware configuration example of the base station device 101 and the terminal device 102.
  • the base station device 101 and the terminal device 102 include a processor 201, a ROM 202, a RAM 203, a storage device 204, and a communication circuit 205.
  • a computer-readable program recorded in any of the ROM 202, the RAM 203, and the storage apparatus 204, which realizes each function of the base station apparatus 101 as described above, is executed by the processor 201.
  • the processor 201 may be replaced by one or more processors such as an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), and a DSP (digital signal processor).
  • the base station device 101 and the terminal device 102 control the communication circuit 205 by, for example, the processor 201, and wirelessly communicate with the other device (the terminal device 102 for the base station device 101 and the base station device 101 for the terminal device 102). Communicate.
  • FIG. 2 shows a schematic diagram in which the base station device 101 and the terminal device 102 have one communication circuit 205, but the present invention is not limited to this.
  • the base station device 101 may have a communication device for communication with the terminal device 102 and a communication device for communication with another base station device or network node.
  • the terminal device 102 may have a communication device for cellular communication with the base station device 101 and a communication device for communication other than cellular communication such as a wireless LAN.
  • FIG. 3 shows an example of the functional configuration of the base station device 101. Part or all of this functional configuration can be realized, for example, by the processor 201 executing a program stored in the ROM 202 or the storage device 204. In addition, dedicated hardware that realizes this functional configuration may be prepared. Further, for example, the functional configuration shown in FIG. 3 may be realized by the processor included in the communication circuit 205 of the base station apparatus 101 executing a dedicated program. Note that FIG. 3 is a drawing obtained by extracting only the function group according to the present embodiment from the functions of the base station device 101, and the base station device 101 functions as a base station device other than these functions. Naturally has. In addition, some of the functions of FIG. 3 may be omitted, or the functions of FIG. 3 may be replaced by other functions having similar capabilities.
  • the base station device 101 includes, for example, a communication unit 301, a response necessity notification unit 302, and a retransmission control unit 303.
  • the communication unit 301 establishes a connection with the terminal device 102 in accordance with the provisions regarding the base station device in the 5G cellular communication standard, and controls downlink and uplink communication, for example.
  • the response necessity notification unit 302 notifies the terminal device 102 of the necessity of the HARQ response regarding the user data transmitted by the corresponding PDSCH. Whether or not the response necessity notification unit 302 schedules by a predetermined method by, for example, as described above, by including a predetermined information in the PDCCH and selecting a sequence to be used when scrambling the PDCCH.
  • the terminal device 102 By determining whether or not to use a predetermined logical channel for transmitting user data, the terminal device 102 is notified of the necessity of transmitting the HARQ response.
  • the response necessity notification unit 302 determines that HARQ is unnecessary when transmitting predetermined user data specified by the telecommunications carrier, for example, and the response of HARQ is unnecessary according to the determination. Can be notified to the terminal device 102.
  • the response necessity notification unit 302 acquires in advance a setting indicating that HARQ is unnecessary for a predetermined application such as remote control of a device, and transmits data to the terminal device 102 for that application. At that time, the terminal device 102 may be notified that the HARQ response is unnecessary.
  • the response necessity notification unit 302 may specify, for example, a communication service to be executed with the terminal device 102, and determine whether or not to use HARQ according to the characteristics of the communication service. For example, the response necessity notification unit 302 may determine that HARQ is unnecessary for a communication service that is required to transmit a signal with high frequency. Further, the response necessity notification unit 302 may notify the terminal device 102 of the necessity of the HARQ response according to the designation, for example, for the communication in which the necessity of HARQ is specified from the network instead of the preset setting. ..
  • the retransmission control unit 303 executes the retransmission control of HARQ. For example, when the retransmission control unit 303 notifies the terminal device 102 that the HARQ response is not necessary for a certain user data, the retransmission control unit 303 executes the retransmission control of the user data based on the response received from the terminal device 102. do.
  • the retransmission control here is, for example, a HARQ retransmission control defined by a conventional cellular communication standard.
  • the retransmission control unit 303 does not perform retransmission when the response received from the terminal device 102 is ACK, and when the response to a certain user data is NACK, the retransmission control unit 303 retransmits the user data (for example, of the same signal). Retransmission, transmission of signals of different redundancy versions, etc.). Further, when the retransmission control unit 303 notifies the terminal device 102 that the HARQ response is unnecessary for a certain user data, the retransmission control unit 303 does not execute the retransmission control for the user data.
  • FIG. 4 shows an example of the functional configuration of the terminal device 102. Part or all of this functional configuration can be realized, for example, by the processor 201 executing a program stored in the ROM 202 or the storage device 204. In addition, dedicated hardware that realizes this functional configuration may be prepared. Further, for example, the functional configuration of FIG. 4 may be realized by the processor included in the communication circuit 205 of the terminal device 102 executing a dedicated program. Note that FIG. 4 is a drawing obtained by extracting only the function group according to the present embodiment from the functions of the terminal device 102, and the terminal device 102 naturally functions as a terminal device other than these functions. Have. In addition, some of the functions of FIG. 4 may be omitted, or the functions of FIG. 3 may be replaced by other functions having similar capabilities.
  • the terminal device 102 includes a communication unit 401, a response necessity determination unit 402, and a response transmission control unit 403.
  • the communication unit 401 establishes a connection with the base station device 101 in accordance with the provisions regarding the terminal device in the 5G cellular communication standard, and controls downlink and uplink communication, for example.
  • the response necessity determination unit 402 determines whether or not to transmit the HARQ response for the received user data in response to the instruction from the base station apparatus 101 as described above. For example, the response necessity determination unit 402 schedules the PDSCH in a predetermined method by identifying the sequence in which the PDCCH was scrambled by confirming the predetermined information included in the PDCCH.
  • the response transmission control unit 403 should transmit a HARQ response (ACK or NACK) to the user data determined by the response necessity determination unit 402 that the HARQ response should be transmitted, and transmit the HARQ response. Control is performed so that the HARQ response is not transmitted to the user data determined not to be.
  • FIG. 5 shows a first processing example.
  • the base station apparatus 101 includes predetermined information in the PDCCH, so that the terminal apparatus 102 determines the necessity of HARQ-ACK for the user data transmitted by the corresponding PDSCH. It can be so. That is, the base station apparatus 101 terminals, for example, a PDCCH containing predetermined information indicating that a HARQ response (HARQ-ACK) is required and a PDSCH using the radio resource specified by the PDCCH. It can be transmitted to the device 102 (S501). In this case, the terminal device 102 determines that the HARQ-ACK should be transmitted by confirming the predetermined information contained in the PDCCH, and indicates whether or not the reception is successful, HARQ-ACK (ACK).
  • HARQ-ACK HARQ-ACK
  • NACK is transmitted to the base station apparatus 101 (S502). Further, the base station apparatus 101 transmits, for example, a PDCCH including predetermined information indicating that HARQ-ACK is unnecessary and a PDSCH using the radio resource specified by the PDCCH to the terminal apparatus 102. Uru (S503). In this case, the terminal device 102 determines that the HARQ-ACK should not be transmitted by confirming the predetermined information contained in the PDCCH (S504), and performs the reception process as it is without transmitting the HARQ-ACK. finish. By including the predetermined information in the PDCCH in this way, the terminal device 102 is notified whether or not HARQ-ACK is unnecessary.
  • the PDCCH contains the predetermined information
  • the PDCCH does not include the predetermined information, so that the above notification may be performed. good. That is, the notification that HARQ-ACK is necessary does not necessarily have to be given.
  • the above notification is given by including the predetermined information in the PDCCH when HARQ-ACK is required and not including the predetermined information in the PDCCH when HARQ-ACK is not required. May be good.
  • FIG. 6 shows a second processing example.
  • the base station apparatus 101 selects the RNTI used for scrambling the PDCCH according to the necessity of transmitting the HARQ, thereby performing the HARQ for the user data transmitted by the corresponding PDSCH. -Allows the terminal device 102 to determine the necessity of ACK.
  • the base station apparatus 101 scrambles the PDCCH using "RNTIx" when it is necessary to transmit HARQ (S601).
  • the base station apparatus 101 scrambles the PDCCH using "RNTIy" when the transmission of HARQ is unnecessary (S603).
  • the terminal device 102 attempts to demodulate the PDCCH using RNTIx and RNTIy, and determines that the RNTI that succeeded in the demodulation was used for scrambling. Then, the terminal device 102 transmits HARQ-ACK when it is determined that RNTIx has been used (S602), and does not transmit HARQ-ACK when it is determined that RNTIy has been used (S604).
  • FIG. 7 shows a third processing example.
  • the terminal device 102 determines the necessity of HARQ-ACK for the user data transmitted by the PDSCH depending on whether or not the radio resource to which the PDSCH is transmitted is allocated by a predetermined method.
  • the predetermined method is the above-mentioned SPS.
  • the present invention is not limited to this, and the necessity of HARQ-ACK may be determined depending on whether or not another scheduling method is used.
  • the terminal device 102 transmits HARQ-ACK for the user data transmitted by the PDSCH (S702). ..
  • the terminal device 102 does not transmit HARQ-ACK for the user data transmitted by the PDSCH when the radio resource is allocated in advance by the SPS and the PDSCH is transmitted by the radio resource (S703). (S704).
  • FIG. 8 shows a fourth processing example.
  • the terminal device 102 determines the necessity of HARQ-ACK for the user data transmitted by the PDSCH depending on whether or not the logical channel of the user data transmitted by the PDSCH is a predetermined logical channel. To be able to judge. In this case, for example, it is determined in advance that HARQ-ACK is not required when the logical channel of user data is “y”, and HARQ-ACK is required for other logical channels. Then, the base station apparatus 101 transmits PDCCH and PDSCH for the user data requiring HARQ-ACK, with the logical channel set to other than "y" (here, it is assumed to be "x”) (S801). ).
  • the terminal device 102 Upon receiving this signal, the terminal device 102 analyzes the MAC header included in the PDSCH to identify the logical channel of the user data (S802). Then, the terminal device 102 determines that the HARQ-ACK should be transmitted based on the determination that the logical channel of the user data transmitted in S801 is "x" and not "y", and receives the HARQ-ACK. HARQ-ACK indicating success or failure is transmitted to the base station apparatus 101 (S803). On the other hand, the base station apparatus 101 transmits PDCCH and PDSCH with the logical channel as “y” for user data that does not require HARQ-ACK (S804).
  • the terminal device 102 Upon receiving this signal, the terminal device 102 analyzes the MAC header included in the PDSCH to identify the logical channel of the user data (S805). Then, the terminal device 102 determines that HARQ-ACK should not be transmitted based on the determination that the logical channel of the user data transmitted in S804 is "y" (S806), and ends the reception process. do.
  • the necessity of HARQ-ACK can be notified from the base station device 101 to the terminal device 102 by various methods. This makes it possible to prevent the HARQ-ACK from being unnecessarily transmitted in a situation where the HARQ-ACK is unnecessary. As a result, the resources of PUCCH can be used efficiently, and the communication efficiency of the entire wireless communication system can be improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un équipement terminal qui communique avec un dispositif de station de base : il détermine, sur la base d'un signal émis par le dispositif de station de base, si oui ou on un accusé de réception de demande de répétition automatique hybride (HARQ) par rapport à des données d'utilisateur reçues en provenance du dispositif de station de base doit être émis ; et il effectue une commande pour émettre l'accusé de réception HARQ par rapport à des données d'utilisateur dans lesquelles l'accusé de réception HARQ doit être émis et pour ne pas émettre l'accusé de réception HARQ par rapport à des données d'utilisateur dans lesquelles l'accusé de réception HARQ ne doit pas être émis.
PCT/JP2021/007869 2020-03-30 2021-03-02 Équipement terminal pour l'exécution d'une demande de répétition automatique hybride efficace, dispositif de station de base, procédé de commande et programme WO2021199843A1 (fr)

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JP2020061037A JP2021163996A (ja) 2020-03-30 2020-03-30 効率化された複合自動再送要求を実行するための端末装置、基地局装置、制御方法、及びプログラム
JP2020-061037 2020-03-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015519821A (ja) * 2012-05-04 2015-07-09 パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ しきい値に基づく電力効率の高いスケジューリング要求手順
WO2018237275A1 (fr) * 2017-06-23 2018-12-27 Qualcomm Incorporated Transmission de données dans un canal physique de commande de liaison descendante
JP2019517753A (ja) * 2016-06-10 2019-06-24 クアルコム，インコーポレイテッド 共有通信媒体上でのアップリンク手順
JP2020507282A (ja) * 2017-02-09 2020-03-05 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ５ｇ／ｌｔｅデュアルコネクティビティ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015519821A (ja) * 2012-05-04 2015-07-09 パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ しきい値に基づく電力効率の高いスケジューリング要求手順
JP2019517753A (ja) * 2016-06-10 2019-06-24 クアルコム，インコーポレイテッド 共有通信媒体上でのアップリンク手順
JP2020507282A (ja) * 2017-02-09 2020-03-05 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ５ｇ／ｌｔｅデュアルコネクティビティ
WO2018237275A1 (fr) * 2017-06-23 2018-12-27 Qualcomm Incorporated Transmission de données dans un canal physique de commande de liaison descendante

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