WO2009021419A1 - Procédé d'accès aléatoire pour un système de radiocommunication cellulaire - Google Patents

Procédé d'accès aléatoire pour un système de radiocommunication cellulaire Download PDF

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Publication number
WO2009021419A1
WO2009021419A1 PCT/CN2008/071393 CN2008071393W WO2009021419A1 WO 2009021419 A1 WO2009021419 A1 WO 2009021419A1 CN 2008071393 W CN2008071393 W CN 2008071393W WO 2009021419 A1 WO2009021419 A1 WO 2009021419A1
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WO
WIPO (PCT)
Prior art keywords
random access
physical layer
response message
receiving
access response
Prior art date
Application number
PCT/CN2008/071393
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English (en)
Chinese (zh)
Inventor
Junfeng Zhang
Zhongda Du
Original Assignee
Zte Corporation
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
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Publication of WO2009021419A1 publication Critical patent/WO2009021419A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to the field of communications and, in particular, to a random access method for a cellular wireless communication system.
  • the cellular wireless communication system is mainly composed of a terminal, a base station, and a core network (Core Network, CN).
  • a network composed of base stations is called a Radio Access Network (RAN), and is responsible for access layer transactions, such as management of radio resources.
  • RAN Radio Access Network
  • a physical or logical connection may exist between a base station (e.g., base station 1 and base station 2 or base station 3 in Figure 1) depending on the actual situation.
  • Each base station can be connected to one or more core network nodes.
  • the core network is responsible for non-access layer transactions, such as location updates.
  • a terminal is a device that can communicate with a cellular wireless communication system, such as a mobile phone, a personal digital assistant, a laptop, and the like.
  • the wireless protocol layer above the physical layer is simply referred to as a high-level protocol, which generally refers to a MAC (Media Access Control) layer protocol in a cellular wireless communication system, and a RLC (Radio Link Control).
  • the random access process of the cellular radio communication system generally includes the following three steps from the perspective of the physical layer: 1.
  • the physical layer of the terminal sends a random access preamble message under the request of the upper layer protocol; 2.
  • the network side responds randomly. Accessing the response message; 3.
  • the physical layer of the terminal transmits the received random access response message to the upper layer protocol for further processing.
  • the terminal After the terminal sends the random access message preamble, it may not receive the random access response message. The reason may be that the signal to noise ratio of the signal of the random access preamble received by the base station is too weak, or the base station sends a random access response message, but the terminal misses the received time or the signal to noise ratio of the received random access response message. Too weak to be able to decode and so on. Whether the terminal determines whether the random access response message is received in time may affect the further progress of the random access process, for example, whether the terminal decides whether to Send random access preamble messages and retransmitted power or no retransmissions.
  • the random access procedure includes the following three steps: a. The terminal sends a random access preamble message on a random access slot; b. The base station responds to the random access response. Message; cl, if the terminal receives a random access response message for the transmitted random access preamble message within the receiving time window, then the corresponding processing is performed according to the content thereof; c2, if the terminal is not receiving time If any random access response message is received in the window, the random access procedure may be considered to be resent, which may trigger the retransmission of the random access preamble message or end the random access procedure.
  • step a different terminals may send different or the same random access preamble on the same random access slot.
  • step b the random access response message replied by the base station may include response information for one or more terminals.
  • the content of the random access response message may also be distributed in different TTI (Transmission Time Interval) within the receiving time window, that is, the terminal may receive multiple random accesses within the receiving time window.
  • Response message The receiving time window is a time interval, and is used to define a time range in which the terminal waits for a random access response message after sending the random access preamble, and may use, for example, a start time and an end time relative to a time when the random access preamble message is sent. Expressed, but not limited to this.
  • steps cl and c2 can be further described by a model of interaction between the physical layer and the upper layer protocol of the terminal in the LTE random access procedure, which is described from the perspective of the terminal, as shown in FIG. 2:
  • the higher layer protocol of the terminal triggers the physical layer to send a random access preamble
  • the message is delivered to the upper layer protocol; if the upper layer protocol receives the indication message delivered by the physical layer (ie, after the random access response message), the high layer protocol message may be triggered.
  • the physical layer may Triggering the retransmission of the random access preamble message.
  • a protection timer is set to prevent the indication message of the physical layer from being waited for, similar to the universal mobile communication system.
  • the timer T2 set by the MAC Media Access Control
  • the upper layer protocol considers that there is no Received a random access response message.
  • the physical layer does not know the timer protection time of the higher layer protocol. In this way, the physical layer will always be in the receiving state, and may receive random access response information of other terminals, and is continuously sent to the upper layer protocol for processing, which increases the processing complexity. Summary of the invention
  • the present invention is directed to a random access method for a cellular wireless communication system, which solves the problem that the physical layer does not know the protection time of the high-layer protocol timer in the prior art, and continuously receives the random access response message and sends it to the upper layer protocol for processing, resulting in increased processing complexity. Degree problem.
  • the present invention provides a random access method for a cellular wireless communication system.
  • the physical layer transmits a random access preamble under the trigger of a high layer protocol, and the physical layer receives a random access response message in a receiving time window. Upon arrival, the physical layer stops receiving the random access response message.
  • the foregoing method may further have the following feature: the receiving time window is a time interval, and is configured to: after the high-layer protocol triggers the sending of the random access preamble, the physical layer receives the random access response message. time limit.
  • the foregoing method may further have the following feature: the receiving time window is configured by the high layer protocol, or is transmitted to the physical layer in an initial random access procedure.
  • the foregoing method may further have the following feature: if the physical layer receives one or more related random access response messages within the receiving time window, the one or more random connections received An incoming response message is passed to the higher layer protocol.
  • the foregoing method may further have the following feature, in the random access process, the physical layer determines, according to the receiving time window, a time to start receiving a random access response message.
  • the present invention also provides a random access method for a cellular wireless communication system.
  • the physical layer transmits a random access preamble triggered by a high layer protocol, and the physical layer receives a random access response message, where:
  • the physical layer stops receiving the random access response message, otherwise, when the receiving time window arrives, the physical layer stops receiving the random Access response message.
  • the foregoing method may further have the following feature: if the high-layer protocol receives the random access response message transmitted by the physical layer and determines the random access response message and the random access The preamble corresponds to send an indication to stop receiving the random access response message to the physical layer.
  • the receiving time window is a time interval, and is configured to: after the high-layer protocol triggers the sending of the random access preamble, the physical layer receives the random access response message.
  • the time range, the receiving time window is configured by the higher layer protocol, or is transmitted to the physical layer during initial random access.
  • the foregoing method may further have the following feature, in the random access process, the physical layer determines, according to the receiving time window, a time to start receiving a random access response message.
  • the physical layer determines the start/stop reception of the random process response signal according to the reception time window, improves the efficiency of the protocol processing, reduces the complexity of the physical layer processing, and reduces the physical layer. Signaling burden between parameter delivery and messaging between the upper layer and the higher layer.
  • FIG. 1 is a schematic diagram of a cellular wireless communication system in accordance with the prior art
  • 2 is a schematic diagram of interaction between a physical layer and a higher layer protocol according to the prior art
  • FIG. 3 is a schematic diagram of a reception time window in a random access method of a cellular wireless communication system according to an embodiment of the present invention
  • Example 4 is a flow chart of Example 1 of a random access method of a cellular mobile system according to an embodiment of the present invention
  • Figure 5 is a flow diagram of an example 2 of a random access method of a cellular mobile system in accordance with an embodiment of the present invention. Preferred embodiment of the invention
  • a random access method for a cellular wireless communication system is provided.
  • a high layer protocol such as layer 2, layer 3, ie, the second layer and the third layer mentioned above
  • transmits a reception time window specifically, The parameter of the receiving time window is given to the physical layer (layer 1), and the receiving time window can also be configured by the higher layer protocol.
  • the physical layer determines, according to the receiving time window or the indications of layer 2 and layer 3, the time for stopping receiving the random access response message, specifically, if layer 2 and layer 3 have relevant indications, according to the Instructing to perform an operation, that is, if the upper layer protocol sends an indication to stop receiving the random access response message to the physical layer, the physical layer root stops the receiving the random access response message, and if layer 2 and layer 3 do not indicate, the receiving time window is received. When it is reached, the physical layer automatically stops receiving the random access response message. In addition, the physical layer may also determine the time to start receiving the random access response message based on the reception time window.
  • layer 2 and layer 3 also need to send any one or more of the following (parameters) to the physical layer: frequency position, time period, time offset, and preamble format of random access , preamble sequence set, ZC sequence number, preamble transmit power, etc.
  • reception TTI window is a time interval, and is used to define a time range in which the physical layer waits for a random access response message after the layer 2 and layer 3 protocols trigger the transmission of the random access preamble. That is, you can define the Receive Time Window parameter as random.
  • the physical layer receives the random access response message from the start time of the random access window, and stops receiving the random access response message at the end of the random access window.
  • the receive time window can also contain the start time and window length.
  • the repetition period of the random access slot is 10 milliseconds
  • the offset of the random access slot from the radio frame is 1 millisecond
  • the start time of the reception time window is 2 milliseconds from the random access time slot
  • the end time of the reception time window is 5 milliseconds from the start time.
  • the high-level (layer 2, layer 3) protocol of the terminal triggers the physical layer to send the random access preamble. The reason may be that the terminal wants to establish an RRC radio connection, or receives a handover command sent by the base station, and requests to switch to the target cell, or the terminal wants to Regain the uplink synchronization to resume uplink or downlink data transmission.
  • the physical layer may receive the random access response message or may not receive the random access response message.
  • the following describes the processing in the above two cases in combination with the examples.
  • Example 1 The physical layer receives a random access response message within the receive time window.
  • Step S402 layer 2, layer 3 (for example, the MAC layer) triggers the physical layer to send a random access preamble; step S404, after completing the transmission of the random access preamble, the physical layer starts to wait for the random access response message;
  • Step S406 if the physical layer receives the random access response message within the receiving time window, the received random access response message is transmitted to layer 2, layer 3;
  • Step S408 the layer 2 and the layer 3 determine whether the delivered random access response message corresponds to the random access preamble sent by the physical layer. If the determination result is yes, the physical layer is notified to stop receiving the random access response message. That is, the indication to stop receiving the random access response message is sent to the physical layer.
  • Step S410 After receiving the indication, the physical layer stops receiving the random access response message.
  • step S408 if the physical layer receives multiple related random access response messages within the receiving time window, the received multiple random access response messages are transmitted to layer 2 and layer 3 unless layer 2 Layer 3 has required the physical layer to stop receiving random access response messages.
  • step S408 if the random access response message received by the physical layer in the receiving time window is judged by the higher layer, it does not correspond to the transmitted random access preamble, that is, layer 2 and layer 3 will not send to stop receiving the random access response. The notification of the message goes to the physical layer, so that the physical layer will automatically stop receiving the random access response message when the receiving time window arrives.
  • Example 2 The physical layer does not receive any random access response message in the receiving time window. As shown in Figure 5, the following processing is included:
  • Step S502 layer 2, layer 3 (for example, the MAC layer) triggers the physical layer to send a random access preamble; step S504, the physical layer waits for the random access response message after completing the transmission of the random access preamble;
  • Step S506 The physical layer stops continuing to receive the random access response message when the receiving time window arrives.
  • the physical layer can also decide the time to start receiving the random access response message according to the receiving time window.
  • the physical layer determines to start/stop receiving the response signal of the random access process according to the receiving time window, improves the efficiency of the protocol processing, reduces the complexity of the physical layer processing, and reduces the complexity. Signaling burden of parameter passing and messaging between the physical layer and the upper layer.
  • the physical layer determines to start/stop receiving the response signal of the random access process according to the receiving time window, improves the efficiency of the protocol processing, reduces the complexity of the physical layer processing, and reduces the complexity. Signaling burden of parameter passing and messaging between the physical layer and the upper layer.

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

Abstract

La présente invention concerne un procédé d'accès aléatoire pour un système de radiocommunication cellulaire. Les couches supérieures déclenchent l'émission par la couche physique d'un préambule d'accès aléatoire, et la couche physique reçoit le message de réponse relatif à l'accès aléatoire. Lorsque l'intervalle temporel de réception est écoulé, la couche physique arrête la réception du message de réponse relatif à l'accès aléatoire. Si la couche physique reçoit des couches supérieures la consigne d'arrêter la réception du message de réponse relatif à l'accès aléatoire avant que l'intervalle temporel de réception soit écoulé, la couche physique arrête la réception du message de réponse relatif à l'accès aléatoire. Dans la présente invention, la couche physique démarre ou arrête la réception d'un message de réponse relatif à un accès aléatoire en fonction de l'intervalle temporel de réception pendant le processus d'accès aléatoire, la présente invention permettant d'améliorer l'efficacité du processus protocolaire, de réduire la complexité du processus de la couche physique, et de diminuer la charge de signalisation des paramètres et des messages qui circulent entre la couche physique et les couches supérieures.
PCT/CN2008/071393 2007-08-15 2008-06-20 Procédé d'accès aléatoire pour un système de radiocommunication cellulaire WO2009021419A1 (fr)

Applications Claiming Priority (2)

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CN200710138100.0 2007-08-15
CN2007101381000A CN101102605B (zh) 2007-08-15 2007-08-15 蜂窝无线通讯系统的随机接入方法

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CN101102605B (zh) * 2007-08-15 2011-12-07 中兴通讯股份有限公司 蜂窝无线通讯系统的随机接入方法
CN101547075B (zh) * 2008-03-25 2013-08-21 中兴通讯股份有限公司 系统消息发送及接收方法
CN101562897B (zh) * 2008-04-18 2010-11-17 大唐移动通信设备有限公司 确定随机接入前导序列响应发送窗口的方法、装置及系统
CN102448181B (zh) * 2010-09-30 2016-04-06 重庆重邮信科通信技术有限公司 Tdd-lte系统竞争解决随机接入方法
WO2016144084A1 (fr) * 2015-03-11 2016-09-15 Lg Electronics Inc. Procédé d'exécution d'une procédure d'accès aléatoire rapide dans un système de communication sans fil et dispositif associé
CN107006032B (zh) * 2015-08-14 2020-05-08 华为技术有限公司 一种信息的传输方法和基站以及用户设备
CN109661830B (zh) * 2016-09-29 2020-08-25 华为技术有限公司 一种随机接入配置的方法及其设备
JP6897443B2 (ja) * 2017-09-13 2021-06-30 ブラザー工業株式会社 制御システム、副制御装置及び制御方法

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