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WO2011123973A1 - Procédé d'accès aléatoire pour système de communication à relais radio et sa station de base - Google Patents

Procédé d'accès aléatoire pour système de communication à relais radio et sa station de base Download PDF

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Publication number
WO2011123973A1
WO2011123973A1 PCT/CN2010/000443 CN2010000443W WO2011123973A1 WO 2011123973 A1 WO2011123973 A1 WO 2011123973A1 CN 2010000443 W CN2010000443 W CN 2010000443W WO 2011123973 A1 WO2011123973 A1 WO 2011123973A1
Authority
WO
WIPO (PCT)
Prior art keywords
relay node
base station
random access
preamble
preamble set
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/CN2010/000443
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English (en)
Chinese (zh)
Inventor
韩锋
郑武
沈钢
张凯宾
刘继民
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.)
Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
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 Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to CN201080065031.5A priority Critical patent/CN102783238B/zh
Priority to PCT/CN2010/000443 priority patent/WO2011123973A1/fr
Publication of WO2011123973A1 publication Critical patent/WO2011123973A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to a random access procedure in an LTE-A (Long Term Evolution Advance) system, and more particularly, to a random access procedure in a scenario in which a Type I relay is deployed.
  • LTE-A Long Term Evolution Advance
  • Type I relays should have their own physical cell ID and be similar to a stand-alone base station (eNB), visible to the user equipment.
  • eNB stand-alone base station
  • FIG. 1 is a schematic diagram showing basic nodes and interfaces in a system in which a Type I relay is deployed, where
  • Un (user-user) represents the interface between the user equipment and the relay node
  • Un user-network
  • FIG. 2 shows the basic operation of a wireless communication system in which a Type I relay is deployed.
  • a new physical control channel herein referred to as "R-PDCCH"
  • R-PDCCH new physical control channel
  • the relay node RN when it is in the connected state, it can only receive downlink traffic from the base station (DeNB) through the R-PDCCH.
  • DeNB base station
  • the RN will serve
  • the UE is referred to as an RN-UE, and the UE served by the eNB is referred to as a macro-UE.
  • the Un link maintains relatively good channel quality due to the use of higher antenna strength and advanced antenna technology.
  • the Un link may also suffer from Radio Link Failure (RLF), and the relay node must perform the re-establishment process under certain circumstances.
  • RLF Radio Link Failure
  • the relay node must perform the re-establishment process under certain circumstances.
  • high time-varying interference can degrade the performance of the receiver at the relay node.
  • the security of the Un link is not good enough when the relay node moves with the vehicle. When the RLF occurs, considering that one relay node may serve multiple RN-UEs at the same time, it is more desirable that the relay node can quickly recover to the connected state, so as to minimize the impact on the RN-UE.
  • Some schemes have been proposed so that the relay node performs when RLF occurs on the Un link.
  • the RRC connects to the reestablishment process and initiates a random access procedure.
  • the relay nodes are all performing contention-based random access. That is, the relay node randomly selects one preamble from the set of preambles previously broadcast by the base station for random access. In this case, the base station cannot distinguish the random access request from the relay node with the normal macro-UE.
  • the base station Since the base station cannot recognize the random access request from the RN or the normal macro-UE, the base station uses the PDCCH to transmit the random access response. If the relay node continues to serve the RN-UE, since it is in in-band operation as described above, the random access response cannot be received. In this case, as a direct solution, the relay node can stop serving the RN-UE and then use the PDCCH to receive the random access response during the RA (random access) response window. Within this window, the relay node cannot send broadcast information, CRS, control signaling, etc. to the RN-UE it serves. At this time, the RN-UE will be in a deep fading state. It can be seen that this scheme has a great impact on the RN-UE.
  • the RN can perform random access again using the random backoff time. Further, when the number of RN-UEs is large, this effect cannot be ignored, for example, more UEs perform RRC re-establishment, or suddenly enter an idle state.
  • a random access method for a wireless relay communication system comprising a base station and a relay node associated with the base station, the method comprising the following Step: the base station allocates a preamble set dedicated to the relay node; the base station knows the preamble set to the relay node; and when the base station and the relay node When a link between the two links fails, the relay node randomly selects a preamble from the set of preambles to send a random access request to the base station.
  • the base station allocates a preamble set dedicated to the relay node, where: the base station divides the preamble set for random access into a preamble set and a non-contention preamble set, where The preamble set of the preamble is for the user equipment served by the base station itself; the non-contention preamble set is divided into a non-competitive preamble subset for the user equipment served by the station itself and a non-competitive preamble for the relay node a synchronization code subset; and assigning a non-contention preamble subset for the relay node to the relay node.
  • the base station notifying the relay node of the preamble set comprises: the base station notifying the relay node of the preamble set by using broadcast signaling.
  • the notifying the base station of the preamble set by the base station comprises: the base station notifying the relay node of the preamble set by using dedicated signaling.
  • the preamble set is based on a non-contention preamble set.
  • the step of the base station allocating a preamble set dedicated to the relay node is performed based on the following characteristics: the number of relay nodes associated with the base station, the number of user equipments served by the base station, The number of user equipment and wireless link status following the node service.
  • the random access method further comprises: the base station identifying a random access request from the relay node, and transmitting a random access response to the relay node by using the R-PDCCH.
  • the random access method further includes: the relay node receives the random access response, and sends an RRC connection reestablishment message to the base station.
  • the random access method further includes: when the RRC connection reestablishment fails, the relay node sends an RRC connection release message to the user equipment that is served by the RRC connection.
  • a base station includes: a random preamble allocation unit, configured to allocate a preamble set dedicated to the relay node, the relay node and the And a preamble set notification unit, configured to notify the relay node of a preamble set dedicated to the relay node, so as to be between the base station and the relay node When the link fails, the relay node randomly selects a preamble from the set of preambles to send a random access request to the base station.
  • the base station can quickly restore the connection state to the connected state when the RLF occurs by allocating and notifying the relay node to the dedicated preamble set, while ensuring the least impact on the normal user equipment.
  • FIG. 1 shows a schematic diagram of basic nodes and interfaces in a system in which a Type I relay is deployed
  • FIG. 2 shows communication between a conventional relay node and an RN-UE using normal subframes, and existing An example of communication between a base station and a relay node using a backhaul subframe;
  • FIG. 3 is a flow chart showing a random access method for a wireless relay communication system according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing preamble allocation for random access according to an embodiment of the present invention
  • FIG. 5 shows an example of a random access procedure according to an embodiment of the present invention
  • FIG. 6 shows a modified example of a random access procedure according to an embodiment of the present invention
  • FIG. 7 shows a schematic structural diagram of a system for implementing a random access method according to an embodiment of the present invention.
  • a base station typically allocates two sets of random access preambles, i.e., a contention based preamble set and a non-contention based preamble set.
  • the former is sent to the user equipment through broadcast signaling for contention-based random access of the user equipment.
  • the latter is allocated by dedicated signaling for user equipment for non-contention based random access, such as handover, downlink data arrival and location, and the like.
  • the present invention proposes to allocate a non-contention preamble subset from a conventional non-contention based preamble set to a relay node.
  • the base station further notifies the relay node of the non-contention pre-sync subset assigned to the relay node by broadcast signaling or dedicated signaling.
  • the relay node may perform a random access procedure using a dedicated preamble to enable the base station to recognize an access request from the relay node and utilize the DL Un sub- On the frame
  • the R-PDCCH sends back a random access response.
  • the relay node knows where to receive the access response and quickly sends an RRC Connection Reestablishment message.
  • FIG. 3 shows a flow chart of a random access method for a wireless relay communication system in accordance with an embodiment of the present invention.
  • the wireless relay communication system includes a base station, a user equipment, and a relay node.
  • the base station allocates a preamble set dedicated to the relay node.
  • the preamble set is based on a non-contention preamble set, and the above allocation may be performed based on the following characteristics: number of relay nodes associated with the base station, number of user equipments served by the base station, relay node service Number of user devices and Un wireless link status, etc.
  • the base station notifies the relay node of the preamble set.
  • the base station may perform the above notification by broadcast signaling such as system broadcast information, or may perform directional notification by dedicated signaling.
  • the relay node randomly selects a preamble from the set of preambles for performing random access to the base station (step S305), and then The base station transmits a random access request (step S307).
  • the base station identifies a random access request from the relay node (step S309), and transmits a random access response to the relay node using the R-PDCCH (step S311).
  • the relay node receives the random access response and sends an RRC connection reestablishment message to the base station, which is the same as the existing operation.
  • the base station uses the R-PDCCH to allocate resources to the relay node in the backhaul DL subframe, and thus the relay node knows how to receive the response from the base station.
  • the random access procedure between the RRC connection reestablishment messages sent by the base station is completely the same as the random access procedure in the prior art, and thus will not be described again.
  • the relay node when the relay node fails to perform the RRC connection re-establishment (such as timeout), the relay node actively sends an RRC connection release message (not shown) to the user equipment in the RRC connected state that it serves, thereby avoiding invalid signaling. With data transfer.
  • the base station first divides the entire preamble set into a preamble preamble set (a portion indicated by a left oblique line in FIG. 4) and a non-competitive preamble according to the division in the conventional specification as described above.
  • the set (the portion indicated by the horizontal line in Fig. 4), the two sets being orthogonal to each other (i.e., not associated with each other).
  • the base station further divides the non-contention preamble set into a non-contention preamble subset for the macro-UE and a non-contention preamble subset for the relay node (ie, the relay node-specific preamble) Collection), also the two subsets are also orthogonal to each other. In this way, the impact on the macro-UE can be minimized.
  • the base station can determine based on parameters and configurations of the system (eg, the number of relay nodes associated with the base station, the number of user equipments served by the base station, the number of user equipment served by the relay node, the quality of the radio link channel, etc.) The size of the preamble subset. For example, when the number of relay nodes is small, or only a fixed number of relay nodes are currently used, the size of the non-contention preamble subset for the relay node can be kept very small.
  • random access preamble allocation operation as shown in FIG. 4 is performed by the base station in this example, those skilled in the art will appreciate that this operation may also be performed by a superior node having similar functions to the base station. To be done.
  • FIG. 5 shows an example of a random access procedure according to an embodiment of the present invention
  • FIG. 6 shows a modified example of a random access procedure according to an embodiment of the present invention. Both of these cases are performed on the basis of the random access preamble allocation as shown in FIG. 4, that is, the random access procedures shown in FIG. 5 and FIG. 6 are based on the random access in FIG. Preamble allocation.
  • the base station transmits a pre-sync code subset for the relay node as shown in FIG. 4 through the system broadcast information (step S501). Since the preamble subset for the relay node is shared by the plurality of relay nodes at this time, this method can reduce the size of the preamble subset for the relay node, so that the macro-UE can be allocated more. Large non-competitive preamble subsets.
  • the relay node randomly selects a preamble from the preamble subset for the relay node to transmit a random access request to the base station (step S503).
  • the base station identifies the random access request from the relay node, and transmits a random access response to the relay node using the R-PDCCH (step S505).
  • the relay node receives the random access response and transmits an RRC Connection Reestablishment message to the base station (step S507).
  • the next process is exactly the same as the existing random access procedure, so it will not be described here.
  • numberOfRA -Preambles-RN represents the size of the preamble subset for the relay node.
  • the relay node can infer that the preamble uses numberO TiA-Preambles to numberOfRA-Preambles-RN-1, where numberOfRA-Preambles is based on the size of the non-contention preamble.
  • the relay node is notified of the preamble subset for it mainly by dedicated signaling in Fig. 6.
  • the base station sends a preamble subset for the relay node as shown in FIG. 4 through dedicated signaling (step S601), that is, the RRC connection reconfiguration message is directed to each relay node.
  • each relay node is assigned a different preamble within the subset of preambles for the relay node, it may be avoided between the relay nodes that may occur in the example shown in FIG. competition.
  • different relay nodes can also be assigned the same preamble.
  • step S603 the relay node sends an R C connection reconfiguration complete message to the base station to indicate that the preamble is received. Then, when an RLF occurs on the Un link between the base station and the relay node, the relay node transmits a random access request to the base station using the received preamble (step S605).
  • the base station identifies the random access request from the relay node and transmits a random access response to the relay node using the R-PDCCH (step S607).
  • the relay node receives the random access response and transmits an RRC Connection Reestablishment message to the base station (step S609).
  • the next process is exactly the same as the existing random access process, so it will not be described here.
  • a schematic configuration of an information element dedicated to dedicated signaling of a relay node is also given.
  • the base station assigns a dedicated preamble to the relay node in the form - e a We/mfec, where - / ⁇ 6/e/ «ife represents the sequence number of the dedicated preamble assigned to the relay node.
  • Figure 7 shows a block diagram of a system implementing a random access method in accordance with an embodiment of the present invention, the system comprising a base station 10 and a relay node 20 associated with the base station.
  • the base station 10 includes: a random preamble allocation unit 101, configured to allocate a preamble set dedicated to a relay node, the preamble set is based on a non-contention preamble set, and The allocation is performed based on the following characteristics: the number of relay nodes associated with the base station, the number of user equipments served by the base station, the number of user equipments served by the relay node, and the state of the radio link; and the preamble set
  • the notifying unit 103 is configured to notify the relay node of the preamble ⁇ A dedicated to the relay node.
  • the random preamble allocation unit 101 is configured to: divide the preamble set for random access into a preamble set and a non-contention preamble set, where the preamble set of the preamble is for the base station itself a user equipment of the service; dividing the non-contention preamble set into a non-contention preamble subset for the user equipment served by the base station itself and a non-contention preamble subset for the relay node; A subset of the non-contention preamble of the relay node is allocated to the relay node.
  • the preamble set notification unit 103 notifies the relay node by broadcast signaling such as system broadcast information or by dedicated signaling.
  • the base station 10 further includes: a random access request receiving unit 105, configured to receive a random access request from the relay node; and a random access request identifying unit 107, configured to identify a random access request from the relay node. And a random access response transmitting unit 109, which transmits a random access response to the relay node by using the R-PDCCH.
  • a random access request receiving unit 105 configured to receive a random access request from the relay node
  • a random access request identifying unit 107 configured to identify a random access request from the relay node.
  • a random access response transmitting unit 109 which transmits a random access response to the relay node by using the R-PDCCH.
  • the relay node 20 is the same as the existing type I relay node, and the main difference is: when the relay node 20 performs the RRC connection reestablishment failure, such as timeout, the relay node 20 actively The user equipment in the RRC connected state sends an RRC connection release message, thereby avoiding invalid signaling and data transmission.
  • the present invention provides a random preamble allocation mechanism and a notification mechanism for a random preamble conforming to the current specification, which is used to allocate and notify a dedicated preamble to a relay node, so that the relay node is in the RLF. Quickly return to the connected state when it appears.
  • the proposed mechanism has the following advantages: When RLF occurs, it provides a very fast recovery mechanism; has the least impact on RN-UE and macro-UE; and has good scalability and can be easily Expand to multi-hop scenarios (ie multiple relay nodes).
  • the present invention can also be implemented by dividing one unit into a plurality of units or combining a plurality of units into one unit as long as it can still perform the corresponding functions.
  • the present invention has been specifically described by taking the type I relay as an example, those skilled in the art should understand that the present invention is also applicable to other systems of LTE-A in which a relay node similar to the type I relay is deployed.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a disk and tape), a hardware or an optically readable digital data storage medium.
  • the implementation also includes a programming computer that performs the steps of the above method.

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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 porte sur un procédé d'accès aléatoire pour un système de communication à relais radio. Le système de communication à relais radio comprend une station de base et un nœud de relais associé à la station de base. Le procédé comprend les étapes suivantes : la station de base attribue un agrégat de préambules dédié pour le nœud de relais ; la station de base notifie l'agrégat de préambules au nœud de relais ; lorsqu'une liaison entre la station de base et le nœud de relais est défaillante, le nœud de relais envoie une requête d'accès aléatoire à la station de base par utilisation d'un préambule aléatoirement sélectionné dans l'agrégat de préambules. La présente invention porte également sur une station de base destinée à réaliser le procédé d'accès aléatoire. Selon la présente invention, par attribution et notification de l'agrégat de préambules dédié au nœud de relais, la station de base permet au nœud de relais de rétablir rapidement l'état de connexion lorsque la défaillance de liaison radio (RLF) se produit, et assure en même temps une influence minimale sur les équipements utilisateur ordinaires.
PCT/CN2010/000443 2010-04-06 2010-04-06 Procédé d'accès aléatoire pour système de communication à relais radio et sa station de base Ceased WO2011123973A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201080065031.5A CN102783238B (zh) 2010-04-06 2010-04-06 用于无线中继通信系统的随机接入方法和基站
PCT/CN2010/000443 WO2011123973A1 (fr) 2010-04-06 2010-04-06 Procédé d'accès aléatoire pour système de communication à relais radio et sa station de base

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Application Number Priority Date Filing Date Title
PCT/CN2010/000443 WO2011123973A1 (fr) 2010-04-06 2010-04-06 Procédé d'accès aléatoire pour système de communication à relais radio et sa station de base

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CN107800523B (zh) * 2016-09-02 2021-03-19 上海诺基亚贝尔股份有限公司 用于配置随机接入信道资源的方法和设备
CN108924962B (zh) * 2017-03-24 2021-05-04 华为技术有限公司 信息指示的方法和装置

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CN101448325A (zh) * 2007-11-27 2009-06-03 大唐移动通信设备有限公司 一种随机接入过程中的处理方法和基站
CN101529754A (zh) * 2006-10-25 2009-09-09 三星电子株式会社 移动通信系统中使用随机接入过程分配无线资源的方法和装置
WO2009110176A1 (fr) * 2008-03-06 2009-09-11 パナソニック株式会社 Station de base radio, dispositif de terminal radio, dispositif de station relais radio, procédé de commande de puissance d'émission, procédé de relais de radiocommunication et système de radiocommunication
CN101686559A (zh) * 2008-09-26 2010-03-31 中兴通讯股份有限公司 一种中继站随机接入方法及系统

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CN101919284B (zh) * 2008-01-18 2015-04-01 爱立信电话股份有限公司 电信系统中用于无线电链路故障恢复的方法和设备

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CN101529754A (zh) * 2006-10-25 2009-09-09 三星电子株式会社 移动通信系统中使用随机接入过程分配无线资源的方法和装置
CN101448325A (zh) * 2007-11-27 2009-06-03 大唐移动通信设备有限公司 一种随机接入过程中的处理方法和基站
WO2009110176A1 (fr) * 2008-03-06 2009-09-11 パナソニック株式会社 Station de base radio, dispositif de terminal radio, dispositif de station relais radio, procédé de commande de puissance d'émission, procédé de relais de radiocommunication et système de radiocommunication
CN101686559A (zh) * 2008-09-26 2010-03-31 中兴通讯股份有限公司 一种中继站随机接入方法及系统

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