WO2013107171A1 - Procédé et système d'accès aléatoire, terminal et équipement de station de base pour un système multi-porteuse - Google Patents

Procédé et système d'accès aléatoire, terminal et équipement de station de base pour un système multi-porteuse Download PDF

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Publication number
WO2013107171A1
WO2013107171A1 PCT/CN2012/079038 CN2012079038W WO2013107171A1 WO 2013107171 A1 WO2013107171 A1 WO 2013107171A1 CN 2012079038 W CN2012079038 W CN 2012079038W WO 2013107171 A1 WO2013107171 A1 WO 2013107171A1
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WO
WIPO (PCT)
Prior art keywords
random access
terminal
identifier
access response
base station
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PCT/CN2012/079038
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English (en)
Chinese (zh)
Inventor
刘扬
喻斌
杜忠达
黄亚达
万璐
Original Assignee
中兴通讯股份有限公司
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Publication of WO2013107171A1 publication Critical patent/WO2013107171A1/fr

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Classifications

    • 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

  • LTE-Advanced Long Term Evolution Advance
  • 3GPP 3rd Generation Partner Project
  • IMT International Telecommunication Union
  • LTE-Advanced The standard introduced by the requirements.
  • LTE-Advanced system is an evolved version based on Long Term Evolution (LTE). It introduces many new technologies to meet the basic needs of IMT-Advanced.
  • carrier aggregation One of the most important technologies is carrier aggregation. .
  • the LTE-Advanced system Due to the current shortage of wireless spectrum resources, the spectrum resources owned by mobile operators in the world tend to be scattered, and IMT-Advanced requires higher peak rate indicators (100 Mbps for high mobility and 1 Gbps for low mobility).
  • the current 20MHz bandwidth of the LTE standard cannot meet the requirements of IMT-Advanced, so it needs to be expanded to higher bandwidth, such as 40MHz, 60MHz, or even higher.
  • One of the methods to increase the bandwidth and peak rate is to expand the frequency domain, for example, to expand the bandwidth of several 20MHz-based LTE bands by "carrier aggregation", which is the essence of carrier aggregation technology. Therefore, the LTE-Advanced system also belongs to a multi-carrier system.
  • the carrier corresponding to the primary cell is a primary carrier, and includes a downlink primary component carrier (DL PCC) for controlling station-to-user equipment data transmission, and an uplink master for user equipment to control station number communication.
  • Uplink Primary Component Carrier (UL PCC).
  • the carrier corresponding to the secondary cell is a secondary component carrier, where the downlink secondary component carrier (DL SCC ) for controlling the data transmission of the user equipment to the user equipment and the data communication for the user equipment to the control station are included.
  • Uplink Secondary Component Carrier UL SCC
  • the base station in order to obtain and maintain the uplink synchronization between the UE and the base station, the base station configures an uplink synchronization timer (TAT) for the UE, and if the UE can receive the base station and sends the UE to the UE before the TAT expires.
  • TAT uplink synchronization timer
  • the amount of time advancement is considered to be uplink synchronization between the UE and the base station, otherwise the TAT times out and the UE considers that the uplink synchronization is lost.
  • the UE obtains the uplink synchronization with the base station by using the random access procedure, and after receiving the random access response (RAR) sent by the base station, the UE starts the timer TAT, and according to the base station, the random The timing of advancement carried in the access response is advanced or delayed.
  • RAR random access response
  • the UE obtains the uplink synchronization with the base station during the TAT operation, if the TA (Time Alignment) command (TA command) sent by the base station to the UE is received, the TAT is restarted, and the timing advance carried in the TA (Time Alignment) command is used.
  • TA Time Alignment
  • the user equipment can work on multiple component carriers at the same time.
  • These component carriers may be continuous or discontinuous in the frequency band; they may be in the same frequency band or may be from different frequency bands.
  • the TAs on the component carriers may be different from each other; even if the component carriers belong to the same frequency band and are in the frequency band Continuously, if each component carrier is derived from a different remote radio unit (RRU), or in order to increase cell coverage, each component carrier is processed via a different repeater, respectively, on each component carrier.
  • RRU remote radio unit
  • the timing advances may also differ from each other.
  • the UE obtains uplink synchronization with the base station through a random access procedure.
  • the random access procedure may be initiated by the physical downlink control channel signaling (PDCCH order) or the medium access control (MAC) layer of the UE.
  • the PDCCH order or the RRC signaling may allocate a dedicated random to the UE.
  • Access preamble Random Access Preamble
  • the random access procedure is a non-contention based manner; otherwise, the UE needs to select a random access preamble, and the random access procedure is a contention based method.
  • Selecting the random access resource by the UE includes selecting a time-frequency i or a resource of a random access preamble and a physical random access channel (PRACH).
  • PRACH physical random access channel
  • Step 2 The Medium Access Control (MAC) layer of the base station (eNB) generates a random access response (RAR) message on the downlink shared channel (Downlink-Shared Channel, DL-SCH for short).
  • the message is sent to the terminal; the message includes at least a Random Access Preamble Identifier (RAPID), Time Alignment (TA) information, an initial uplink grant (UL Grant, Uplink Grant), and a temporary cell-wireless Temporary C-RNTI;
  • RAPID Random Access Preamble Identifier
  • TA Time Alignment
  • UL Grant Uplink Grant
  • a temporary cell-wireless Temporary C-RNTI The message passes the Random Access-Radio Network Temporary Identifier on the Physical Downlink Control Channel (PDCCH).
  • PDCCH Physical Downlink Control Channel
  • Step 3 The terminal is in the Uplink-Shared Channel (UL-SCH) Cell-Radio Network Temporary Identity (C-RNTI), Medium Access Control Element (MAC Control Element) or Common Control Logical Channel Service Data Unit (CCCH SDU) including Contention Resolution Identity; Support Hybrid Automatic Retransmission Re Quest (HARQ).
  • UL-SCH Uplink-Shared Channel
  • C-RNTI Cell-Radio Network Temporary Identity
  • MAC Control Element Medium Access Control Element
  • CCCH SDU Common Control Logical Channel Service Data Unit
  • Contention Resolution Identity Support Hybrid Automatic Retransmission Re Quest
  • Step 4 The base station sends a contention resolution message on the DL-SCH; the message is indicated by a C-RNTI or a temporary C-RNTI (ie, TC-RNTI) on the PDCCH, and may include a contention resolution identifier; The sending of the message supports HARQ.
  • a C-RNTI or a temporary C-RNTI ie, TC-RNTI
  • the SCell may be scheduled by other cells (secondary cell or primary cell), and the PDCCH or PDCCH on the SCell that does not schedule RAR message resources is interfered by signals of other cells.
  • the RAR in step 2 can only be scheduled and transmitted on another carrier (as shown in Figure 3), that is, scheduled and transmitted on the scheduling cell.
  • the protocol that supports multiple timing advances is called a new protocol (for example, the R11 protocol in LTE-A), and the terminal that supports multiple timing advances is called a new terminal (for example, an R11 terminal), and a protocol that does not support multiple timing advances is called.
  • a new protocol for example, the R11 protocol in LTE-A
  • a terminal that does not support multiple timing advances is called an old terminal (for example, an R10 terminal).
  • the cell that is scheduled by the cross-carrier in the present case is called the scheduled cell and can only be the secondary cell, and the scheduling cell can be the primary cell or the secondary cell.
  • Question 1 How to distinguish the random access response returned from the scheduling cell corresponding to the random access preamble sent by the terminal supporting the multi-time advancement on the scheduled cell, and the terminal not supporting the multi-time advancement on the scheduling cell The random access preamble corresponding to the random access response returned from the scheduled cell. As shown in FIG. 4, how to distinguish the random access response corresponding to the terminal 4 and corresponding to The random access response of the terminal 1.
  • Question 2 How to distinguish the random access response returned from the scheduling cell corresponding to the random access preamble sent by the terminal supporting the multi-time advancement on the scheduled cell, and the terminal supporting the multi-time advancement on the scheduling cell
  • the random access preamble corresponds to the random access response returned from the scheduling cell. As shown in FIG. 4, how to distinguish the random access response corresponding to the terminal 4 from the random access response corresponding to the terminal 2, or how to distinguish the random access response corresponding to the terminal 3 and the random access response corresponding to the terminal 2 .
  • an embodiment of the present invention provides a random access method for a multi-carrier system, including:
  • the base station uses a random access radio network temporary identifier (RA-RNTI) to indicate a random access response
  • RA-RNTI random access radio network temporary identifier
  • the terminal is a terminal supporting an MTA
  • the identifier information carried in the random access response includes a terminal-specific RAPID that supports the MTA, and identifier information indicating the terminal.
  • the terminal sends a random access preamble
  • the terminal identifies the random access response of the terminal according to the received random access radio network temporary identifier (RA-RNTI) and the identification information carried by the random access response.
  • RA-RNTI random access radio network temporary identifier
  • the terminal is a terminal supporting multiple time advance (MTA);
  • the step of the terminal identifying the random access response of the terminal includes: Determining, by the received RA-RNTI, the time-frequency resource of the random access preamble corresponding to the terminal, and the random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific RAPID supporting the MTA, and the random When the identifier of the terminal that is carried in the access response is the same as the identifier of the local terminal, it is determined that the random access response indicated by the RA-RNTI is a random access response corresponding to the random access procedure of the terminal.
  • an embodiment of the present invention further provides a base station device, including a base station side random access process processing module, where
  • the base station side random access procedure processing module is further configured to set a random access preamble identifier dedicated to the terminal supporting the MTA.
  • the identifier information carried in the random access response includes a random access preamble identifier corresponding to the random access preamble, and identifier information indicating the terminal.
  • the identifier information carried in the random access response includes a terminal-specific random access preamble identifier that supports the MTA, and identifier information indicating the terminal.
  • the beneficial effect of the present invention is to maintain backward compatibility while satisfying the new version protocol for MTA For the requirement of random access, in the compatible cross-carrier scheduling and local carrier scheduling applications, the terminal supporting MTA and the terminal not supporting MTA can accurately complete the random access process.
  • This solution is of great value to the engineering implementation of the new version of the communication system.
  • FIG. 5 is a schematic diagram of a random access method of a multi-carrier system according to an embodiment of the present invention.
  • the identifier information carried in the random access response includes a random access preamble identifier (RAPID) corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble.
  • RAPID random access preamble identifier
  • the scheduling cell in the cross-carrier random access process may be fixed in the PCell, or may be configured to send a PCell of the random preamble cell or schedule the SCell of the random preamble cell.
  • the random access preamble is received by the base station on the secondary cell, and the random access response is sent by the base station on the primary cell or a secondary cell different from the secondary cell that sends the random access preamble.
  • the base station device in the solution includes a base station side random access procedure processing module, configured to receive a random access preamble sent by the terminal, and use a random access radio network temporary identifier (RA-RNTI) to indicate a random access response scenario. And transmitting, in the random access response, the identifier information used by the terminal to identify the random access response of the terminal.
  • RA-RNTI random access radio network temporary identifier
  • the identifier information carried in the random access response includes a random access preamble identifier (RAPID) corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble.
  • RAPID random access preamble identifier
  • the base station side random access procedure processing module is further configured to set the same partial resource in the dedicated random access preamble resource of each cell to be a terminal-specific random access preamble resource supporting multiple time advance (MTA).
  • MTA multiple time advance
  • the base station side random access procedure processing module is further configured to set a random access preamble identifier dedicated to the terminal that supports the MTA, and after receiving the random access preamble sent by the terminal supporting the MTA, the base station carries the random access response in the sent random access response.
  • the dedicated random access preamble identifier is a cell radio network temporary identifier (C-RNTI)
  • C-RNTI cell radio network temporary identifier
  • the base station side random access procedure processing module is further configured to identify the cell radio network temporary identifier (C-RNTI) in the random access response.
  • the identifier information carried in the random access response includes a random access preamble identifier corresponding to the random access preamble received by the base station, and identifier information indicating a terminal that sends the random access preamble.
  • the terminal side random access process processing module identifies the random access response of the terminal by: determining that the random access wireless network temporary identifier (RA-RNTI) corresponds to the time frequency resource for transmitting the random access preamble by itself, and The random access preamble identifier carried in the random access response indicated by the RA-RNTI is the same as the identifier corresponding to the random access preamble sent by the local terminal, and the identifier information of the terminal carried in the random access response is the same as the local terminal identifier. And determining that the random access response is a random access response corresponding to the random access procedure of the terminal.
  • the identifier information carried in the random access response includes a terminal-specific random access preamble identifier supporting a multi-time advance (MTA), and identifier information indicating a terminal that sends the random access preamble.
  • MTA multi-time advance
  • the terminal side random access process processing module further identifies the random access response of the terminal by: determining that the random access wireless network temporary identifier (RA-RNTI) corresponds to the time frequency resource for transmitting the random access preamble, and
  • the random access preamble identifier carried in the random access response indicated by the RA-RNTI is a terminal-specific random access preamble identifier (RAPID) supporting the MTA, and the identifier of the terminal carried in the random access response and the local terminal identifier
  • RAPID terminal-specific random access preamble identifier
  • the identification information of the terminal is a cell radio network temporary identifier (C-RNTI).
  • C-RNTI cell radio network temporary identifier
  • the random access system of the multi-carrier system in the solution includes the above-mentioned base station device and the above-mentioned terminal.
  • the terminal that does not support the MTA does not use the random access preamble resource dedicated to the new terminal, and compares the identifier of the random access preamble in the random access response with the random transmission when the terminal initiates the random access procedure.
  • the identifier of the access preamble can distinguish the random access response of the old terminal from the random access response of the new terminal.
  • the random access response of the terminal 1 and the terminal 2 the random access response of the terminal 1 and the terminal 3, and the random access response of the terminal 1 and the terminal 4 can be distinguished. The problem is solved.
  • the terminal can determine.
  • the RAR message is sent to itself. If two new terminals use the same specific random access preamble and the same access time frequency resource to initiate random access on different scheduled cells, as long as the C-RNTI in the RAR is parsed according to the solution of the present invention, It is accurately determined which terminal of the RAR is the RAR in the random access process. Corresponding to Fig. 4, terminal 3 and terminal 4 can be distinguished. Question 3 is resolved.
  • the old terminal can only use the dedicated random access preamble allocated by the base station on the scheduling cell (because the old terminal cannot initiate random access on the scheduled cell), and the new terminal uses the scheduled base station on the cell when the random access preamble is initiated on the scheduling cell.
  • the allocated dedicated random access preamble uses a dedicated random access preamble allocated by the base station on the scheduled cell when initiating a random access preamble on the scheduled cell.
  • the base station After receiving the random access preamble of the old terminal, the base station carries the random access preamble itself as a random access preamble identifier in the sent random access response, and after the base station receives the random access preamble of the new terminal, the base station sends the The random access response carries a random access preamble identifier dedicated to the new terminal.
  • the new terminal accesses the random access preamble on the scheduled cell, and the other new terminal accesses the same random access preamble on the scheduled cell, and the base station includes the new terminal specific in the related RAR message.
  • a random access preamble identifier RAPID and a cell-radio network temporary identifier C-RNTI are used instead of the temporary cell-radio network temporary identifier TC-RNTI, and the two terminals can identify the corresponding random access response through the C-RNTI.
  • terminal 3 and terminal 4 can be distinguished, and problem three can be solved.
  • the terminal that initiates random access in the secondary cell does not use the random access preamble resource dedicated to the random access by the terminal on the primary cell, thereby comparing the identifier and terminal of the random access preamble in the random access response.
  • the identifier of the random access preamble sent when the random access procedure is initiated may distinguish the random access response of the old terminal from the random access response of the random access procedure initiated by the new terminal in the scheduled cell.
  • the random access response of the terminal 1 and the terminal 3, and the random access response of the terminal 1 and the terminal 4 can be distinguished. The problem is solved.
  • the terminal supporting the MTA sends a random access preamble dedicated to the primary cell on the scheduling cell, and the base station sends the traditional random access response to the random access preamble on the scheduling cell.
  • the RAPID corresponding to the dedicated random access preamble is included in the relevant RAR message in the scheduling cell. And indicating the RAR with the RA-RNTI corresponding to the received random access preamble.
  • the terminal supporting the MTA follows the tradition in the scheduling cell.
  • the RA-RNTI calculation method receives the RAR, and uses the RAPID of the transmitted random access preamble and the RAPID included in the reconciliation RAR. If both information are the same, it can be determined that the RAR message is sent to itself.
  • the MTA-enabled terminal receives the RAR according to the conventional RA-RNTI calculation method on the scheduling cell, and uses the RAPID and C-RNTI of the transmitted random access preamble to check the RAPID and C-RNTI included in the RAR, if both information are the same. , it can be judged that the RAR message is sent to itself. If two new terminals use the same specific random access preamble and the same access time frequency resource to initiate random access on different scheduled cells, as long as the C-RNTI in the RAR is parsed according to the solution of the present invention, It is accurately determined which terminal of the RAR is the RAR in the random access process. Corresponding to Fig. 4, terminal 3 and terminal 4 can be distinguished. The third problem is solved.
  • the base station includes the identification information in the RA-RNTI identifying the cross-carrier scheduling RAR message. For example, the calculation of the RA-RNTI adds a predetermined offset to the result of the conventional calculation method.
  • the calculation method including the identifier is
  • offset is a value corresponding to the access cell, for example, an index of the accessed cell, or a linear combination of parameters such as t-id, f-id, and visited cell index, in order to ensure the calculated
  • the RA-RNTI is not overlapped with the RA-RNTI of the R10 UE existing on the carrier that schedules the RAR, and the RA-RNTI in the random access response of the new terminal accessed by the different access cells is also different. Therefore, the new terminal that is scheduled across carriers can identify the random access response corresponding to the random access procedure itself.
  • the conventional RA-RNTI calculation method is only applicable to PCELL.
  • the beneficial effect of the present application is to maintain backward compatibility while satisfying the new version protocol for MTA For the requirement of random access, in the compatible cross-carrier scheduling and local carrier scheduling applications, the terminal supporting MTA and the terminal not supporting MTA can accurately complete the random access process.
  • This solution is of great value to the engineering implementation of the new version of the communication system.

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

Abstract

L'invention concerne un procédé d'accès aléatoire pour un système multi-porteuse, ledit procédé comprenant les étapes suivantes : une station de base reçoit un préambule d'accès aléatoire envoyé par un terminal ; et la station de base transmet dans une réponse d'accès aléatoire envoyée les informations d'identification permettant au terminal d'identifier sa réponse d'accès d'aléatoire, dans un scénario dans lequel la station de base utilise une identité temporaire de réseau d'accès radio aléatoire (RA-RNTI) pour indiquer la réponse d'accès aléatoire. Le procédé répond aux spécifications d'un protocole nouvelle version pour l'accès aléatoire d'un MTA, tout en conservant la compatibilité ascendante, permet à la fois à un terminal prenant en charge le MTA et à un terminal ne prenant pas en charge le MTA d'exécuter avec précision un processus d'accès aléatoire du fait qu'il est compatible avec l'ordonnancement inter-porteuse et l'ordonnancement porteuse locale, et apporte une importante contribution à la réalisation d'un projet de système de communication nouvelle version.
PCT/CN2012/079038 2012-01-20 2012-07-23 Procédé et système d'accès aléatoire, terminal et équipement de station de base pour un système multi-porteuse WO2013107171A1 (fr)

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CN201210019170.5A CN103220813B (zh) 2012-01-20 2012-01-20 一种多载波系统的随机接入方法及系统及终端及基站设备
CN201210019170.5 2012-01-20

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WO2018102966A1 (fr) * 2016-12-05 2018-06-14 广东欧珀移动通信有限公司 Procédé d'accès aléatoire, dispositif de réseau et dispositif terminal
US11051342B2 (en) * 2016-12-26 2021-06-29 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Random access method and apparatus
CN110719648B (zh) * 2017-08-11 2020-09-18 华为技术有限公司 一种信息发送、信息接收方法及装置
WO2019119257A1 (fr) * 2017-12-19 2019-06-27 华为技术有限公司 Procédé et appareil d'accès aléatoire
CN111886918B (zh) * 2018-03-19 2023-03-24 华为技术有限公司 一种随机接入方法及装置
TWI704826B (zh) * 2018-09-28 2020-09-11 財團法人資訊工業策進會 用於行動通訊系統之使用者裝置及基地台
CN111082906B (zh) * 2018-10-22 2022-04-26 成都鼎桥通信技术有限公司 一种特殊小区的prach配置方法和设备
CN111867122B (zh) * 2019-04-26 2022-08-30 中国移动通信有限公司研究院 随机接入方法、网络侧节点及终端
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