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WO2010097021A1 - 一种随机接入控制方法、系统及设备 - Google Patents

一种随机接入控制方法、系统及设备 Download PDF

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Publication number
WO2010097021A1
WO2010097021A1 PCT/CN2010/070455 CN2010070455W WO2010097021A1 WO 2010097021 A1 WO2010097021 A1 WO 2010097021A1 CN 2010070455 W CN2010070455 W CN 2010070455W WO 2010097021 A1 WO2010097021 A1 WO 2010097021A1
Authority
WO
WIPO (PCT)
Prior art keywords
synchronization code
uplink synchronization
code resource
resource
base station
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/CN2010/070455
Other languages
English (en)
French (fr)
Inventor
杨宁
沈晓冬
刘光毅
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.)
China Mobile Communications Group Co Ltd
Original Assignee
China Mobile Communications Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Mobile Communications Corp filed Critical China Mobile Communications Corp
Priority to EP10745805.1A priority Critical patent/EP2403311B1/en
Publication of WO2010097021A1 publication Critical patent/WO2010097021A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a random access control technique applied to a wireless cellular network that introduces a relay device. Background technique
  • the 3GPP (3rd Generation Partnership Project) has initiated the standardization of LTE (Long Term Evolution).
  • LTE Long Term Evolution
  • the existing LTE system adopts a collision-based random access scheme, which can implement two functions of uplink synchronization and random access of a UE (User Equipment).
  • the UE first completes the uplink synchronization process before continuing the connection establishment process.
  • the collision-based random access scheme in the LTE system includes the following steps:
  • S101 The UE randomly sends a Preamble (introduction) resource for uplink synchronization on a PRACH (Physical Random Access Channel) resource, and the specific bearer signaling message is a Random Access Preamble. ;
  • the PRACH resource is a time-frequency resource block that is carried on the PRACH channel
  • the Preamble resource is an uplink synchronization code resource.
  • the eNB base station
  • the UE receives the Random Access Response returned by the eNB, and completes an uplink synchronization process.
  • an uplink synchronization code collision occurs, which may also be referred to as a Preamble collision in the LTE system, and the eNB may feed back the backoff information in the Random Access Response (also It can be called overload information. If the UE performs backoff according to the backoff information, the UE cannot continue the subsequent connection establishment process, and the process ends. If no Preamble collision occurs, the eNB will feedback in the Random Access Response.
  • the uplink acknowledgement information is used to allocate a Preamble resource to the UE, so that the UE can continue the subsequent connection establishment process;
  • the UE sends the access request information to the eNB according to the Preamble resource allocated by the uplink acknowledgement information, where the specific bearer signaling message is Scheduled Transmission;
  • the eNB returns a Connection Resolution to the UE, and confirms that the connection is established, that is, the access is completed.
  • the collision-based random access scheme in the existing LTE system can still be used to complete the random access process of the UE.
  • the existing collision-based random access scheme when multiple UEs select the same Preamble resource for random access on the same PRACH resource, the multiple UEs will have a Preamble collision, and the eNB will go to all UEs that have a Preamble collision.
  • the backoff information is fed back, so that the UE performs backoff according to the backoff information, which results in a large access delay and a low access efficiency, which seriously affects the user experience. Summary of the invention
  • the present invention provides a random access control method and system for solving the problem that the user access delay and the access efficiency are low in the existing collision-based random access scheme.
  • the present invention provides a relay device, a base station device, and a user terminal device.
  • the random access control method provided by the present invention is applied to a wireless cellular network that introduces a relay device, including:
  • the base station feeds back the backoff information to the at least two user terminals;
  • the base station notifies the corresponding user terminal by the relay device
  • the uplink synchronization code resource reservation is successful, so that the user terminal uses the uplink synchronization code resource with a successful reservation to access the wireless cellular network
  • the random access control system provided by the present invention is applied to a wireless cellular network that introduces a relay device, including a relay device and a base station, where:
  • the relay device is configured to reserve the uplink synchronization code resource to the base station when receiving an uplink synchronization code resource sent by the user terminal to the base station on any random access channel resource;
  • the base station when receiving the same uplink synchronization code resource that is sent by the at least two user terminals on the same random access channel resource, feeding back the backoff information to the at least two user terminals, if the at least two users
  • the relay device When the one of the user terminals subscribes to the uplink synchronization code resource by using the relay device, the relay device notifies the corresponding user terminal that the uplink synchronization code resource reservation is successful, so that the user terminal adopts the uplink synchronization code with successful reservation.
  • the resource performs access to the wireless cellular network, and notifies all user terminals that the uplink synchronization code resource has been reserved.
  • the relay device provided by the present invention includes:
  • a reservation unit configured to reserve, according to any random access channel resource, an uplink synchronization code resource sent by the user terminal to the base station, to reserve the uplink synchronization code resource to the base station;
  • a forwarding unit configured to forward the notification to the corresponding user terminal when receiving the notification that the uplink synchronization code resource subscription returned by the base station is successful.
  • the base station device provided by the present invention is applied to a wireless cellular network that introduces a relay device, and includes a receiving unit, a control unit, and a processing unit, where:
  • the receiving unit is configured to receive an uplink synchronization code resource that is sent by the user terminal on the random access channel resource, and receive a reservation of the uplink synchronization code resource by the user terminal by using the relay device;
  • the control unit is configured to: when receiving the same uplink synchronization code resource that is sent by the at least two user terminals on the same random access channel resource, feed back information to the at least two user terminals, if the at least two
  • the processing unit is triggered when one of the user terminals subscribes to the uplink synchronization code resource by using the relay device;
  • the processing unit is configured to notify the corresponding user terminal that the uplink synchronization code resource reservation is successful by using the relay device, so that the user terminal uses the uplink synchronization code resource with a successful reservation to access the wireless cellular network, and notifies all users.
  • the uplink synchronization code resource of the terminal has been reserved.
  • the user terminal device provided by the present invention is applied to a wireless cellular network that is used to introduce a relay device, and includes: a random access initiating unit, configured to randomly send an uplink synchronization code resource to a base station on a random access channel resource;
  • a random access processing unit configured to: if receiving the notification that the uplink synchronization code resource subscription is successfully sent by the relay device, and receiving the backoff information fed back by the base station, omitting the backoff information, and adopting a successful uplink reservation
  • the synchronization code resource is used for accessing the wireless cellular network.
  • the random access control method, system and device provided by the present invention are applied to a wireless cellular network that introduces a relay device, if the relay device receives an uplink synchronization code resource sent by a user terminal to a base station on any random access channel resource. And the base station reserves the uplink synchronization code resource; when an uplink synchronization code collision occurs at the base station, if one of the user terminals reserves the uplink synchronization code resource to the base station through the relay device, the base station notifies the corresponding device through the relay device.
  • the user terminal successfully subscribes to the uplink synchronization code resource, and notifies all user terminals that the uplink synchronization code resource has been reserved; if the user terminal receives the backoff information and receives the notification that the uplink synchronization code resource reservation is successful, the backoff information is ignored, and the reservation is adopted.
  • a successful uplink synchronization code resource is used for accessing the wireless cellular network.
  • the method for the uplink synchronization code resource reservation by the relay device enables the user terminal that successfully subscribes to the uplink synchronization code resource to avoid the backoff and access the wireless cellular network in time, thereby effectively reducing the access delay of the user and improving the user's access delay. Access efficiency, which enhances the user experience.
  • FIG. 2 is a schematic diagram of comparison of access paths in an embodiment of the present invention.
  • FIG. 3 is a flowchart of a random access control method according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a relay device according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a user terminal according to an embodiment of the present invention. detailed description
  • the relay device can effectively cover a region with the base station as an effective way to expand system coverage and increase system capacity.
  • the number of UEs that the relay device and the base station cover are different, and the UE1 in the relay coverage area and the UE2 outside the relay coverage area send the same Preamble resource to the base station on the same PRACH resource.
  • the Preamble resource can be reserved by the relay device, so that the collision user UE1 in the relay coverage area avoids backoff and access the wireless cellular network in time, thereby reducing the access delay of the user and improving the access efficiency of the user. Improved user experience.
  • the LTE-Advanced system is taken as an example to compare the access paths.
  • a relay device is introduced in the LTE-Advanced system, and the random access process of the UE can still be completed by using a collision-based random access scheme in the existing LTE system, and the access path is as shown in FIG. 2
  • the access path is as shown in the access path 2 in FIG. 2 .
  • the random access control method provided by the embodiment of the present invention is applied to a wireless cellular network that introduces a relay device, and includes the following steps:
  • the base station feeds back the backoff information to the at least two UEs.
  • the base station If one of the at least two UEs subscribes to the base station by using the relay device, The line synchronization code resource, the base station notifies the corresponding UE that the uplink synchronization code resource reservation is successful, and the notification that the uplink synchronization code resource reservation is successful is used to instruct the UE to ignore the backoff information, and adopts the uplink synchronization code with successful reservation.
  • the resource accesses the wireless cellular network, and notifies all UEs that the uplink synchronization code resource has been reserved;
  • the UE may reserve the uplink synchronization code resource to the base station by using the relay device, and for the relay device that simultaneously accesses multiple UEs, After the uplink synchronization code collision occurs at the device, the relay device does not reserve the uplink synchronization code resource to the base station;
  • one of the at least two UEs receives the notification that the uplink synchronization code resource reservation is successful, and receives the backoff information, the backoff information is ignored, and the uplink synchronization code resource with successful reservation is used for the wireless cellular network.
  • the backoff information If only one of the at least two UEs receives the backoff information, it is backed off according to the backoff information in accordance with the prior art.
  • the base station determines that the uplink synchronization code resource reservation fails; after determining that the uplink synchronization code resource reservation fails, the base station may also The corresponding UE is notified by the relay device that the uplink synchronization code resource reservation fails.
  • the base station If the base station does not receive the reservation of the uplink synchronization code resource by the relay device, the base station feeds back the backoff information to the at least two UEs in accordance with the prior art.
  • the random access solution provided by the embodiment of the present invention is applicable to a wireless cellular network, such as an LTE-Advanced network and its subsequent evolved network, and a WiMAX (World Interoperability for Microwave Access) network. , and many more.
  • the base station in the embodiment of the present invention specifically refers to an eNB in an LTE-Advanced network and its subsequent evolved network, a BS (Base Station) in a WiMAX network, and the like.
  • the random access scheme provided by the embodiment of the present invention will be described in detail below by taking the LTE-Advanced network as an example.
  • the LTE-Advanced system includes an eNB, a relay device, and A plurality of UEs, where the random access channel resource specifically refers to a PRACH resource, and the uplink synchronization code resource specifically refers to a Preamble resource.
  • UE1 and UE2 select the same Preamble resource to initiate a random access procedure on the same PRACH resource, UE1 is in the coverage area of the relay device 1, and UE2 is not in the coverage area of any relay device, as shown in FIG. As shown, it includes the following steps:
  • UE1 and UE2 respectively send Preamble resources for uplink synchronization to the eNB through the PRACH channel on the same PRACH resource, and the specific bearer signaling message is a Random Access Preamble;
  • the eNB receives a Preamble resource that is sent by the UE1 and the UE2 on the same PRACH resource, and a Preamble collision occurs at the eNB.
  • the eNB needs to feed back the backoff information to UE1 and UE2.
  • the backoff information can be fed back within 10ms.
  • the relay device 1 receives, on the current PRACH resource, a Preamble resource sent by the UE1 to the eNB, and sends the reservation information to the eNB, where the reservation information is used to reserve the Preamble resource.
  • S404 The eNB feeds back the backoff information to UE1 and UE2.
  • the eNB receives the reservation of the Preamble resource by the UE1 through the relay device 1, and sends a reservation confirmation to the UE1 through the relay device 1, and notifies the UE1 that the Preamble resource reservation is successful.
  • the eNB notifies all UEs that the Preamble resource has been reserved.
  • the eNB notifies all UEs that the Preamble resource has been reserved to ensure that the random access procedure of the subsequent UE1 is smoothly performed.
  • the eNB may notify all UEs that the Preamble resource has been reserved by means of a broadcast message on the broadcast channel, or may use a bit-map ( Bit mapping) informs all UEs that the Preamble resource has been reserved;
  • the bit-map method is to set a bit for each of the 64 Preamble resources. If the bit corresponding to a certain Preamble resource is set to 1, it indicates that the Preamble resource has been reserved, and the bit is set to 0, indicating the Preamble resource. Not made a reservation;
  • the UE1 that has received the reservation confirmation and the backoff information ignores the backoff information, and performs the access of the LTE-Advanced network by using the reserved Preamble resource; and the UE2 that receives only the backoff information performs the backoff according to the backoff information.
  • UE1 and UE2 select the same Preamble resource to initiate a random access procedure on the same PRACH resource, UE1 is in the coverage area of the relay device 1, and UE2 is in the coverage area of the relay device 2, as shown in FIG.
  • the indication includes the following steps:
  • UE1 and UE2 send the Preamble resource for uplink synchronization to the eNB through the PRACH channel on the same PRACH resource, and the specific bearer signaling message is a Random Access Preamble;
  • the eNB receives a Preamble resource that is sent by the UE1 and the UE2 on the same PRACH resource, and a Preamble collision occurs at the eNB.
  • the relay device 1 receives, on the current PRACH resource, a Preamble resource that is sent by the UE1 to the eNB, and then sends the reservation information to the eNB, where the reservation information is used to reserve the Preamble resource; and the relay device 2 is on the current PRACH resource.
  • S504 The eNB feeds back the backoff information to UE1 and UE2.
  • the eNB determines that the reservation of the Preamble resource fails.
  • the UE1 and the UE2 that receive only the backoff information perform backoff according to the backoff information. It should be noted that S504 and S505 only give step numbers for convenience of description. Actually, there is no strict timing relationship between the two steps.
  • UE1, UE2, and UE3 select the same Preamble resource to initiate a random access procedure on the same PRACH resource, UE1 is in the coverage area of the relay device 1, and UE2 and UE3 are in the coverage area of the relay device 2, As shown in Figure 6, the following steps are included:
  • S601, UE1, UE2, and UE3 send Preamble resources for uplink synchronization to the eNB through the PRACH channel on the same PRACH resource, and the specific signaling message is Random Access Preamble;
  • the eNB receives a Preamble resource that is sent by the UE, the UE2, and the UE3 on the same PRACH resource, and a Preamble collision occurs at the eNB.
  • the relay device 1 receives, on the current PRACH resource, a Preamble resource sent by the UE1 to the eNB, and sends the reservation information to the eNB, where the reservation information is used to reserve the Preamble resource;
  • the relay device 2 receives the Preamble resources sent by the two user terminals, that is, the UE2 and the UE3 to the eNB, on the current PRACH resource, and the Preamble collision also occurs at the relay device 2, and the relay device 2 does not send the reservation information to the eNB. ;
  • the eNB feeds back the backoff information to UE1, UE2, and UE3.
  • the eNB receives the reservation of the Preamble resource by the UE1 through the relay device 1, and sends a reservation confirmation to the UE1 through the relay device 1, and notifies the UE1 that the reservation of the Preamble resource is successful.
  • the eNB notifies all UEs that the Preamble resource has been reserved;
  • the eNB notifies all UEs that the Preamble resource has been reserved to ensure that the random access procedure of the subsequent UE1 is smoothly performed.
  • the eNB may notify all UEs that the Preamble resource has been reserved by means of a broadcast message on the broadcast channel, or may use a bit-map ( Bit mapping) informs all user terminals that the Preamble resource has been reserved;
  • the UE1 that receives the reservation confirmation and the backoff information ignores the backoff information and adopts the reservation.
  • the working Preamble resource performs access to the LTE-Advanced network; only UE2 and UE3 that receive the backoff information perform backoff according to the backoff information.
  • the eNB does not directly send the backoff information to all UEs that have a Preamble collision, and prompts the UE to back off according to the backoff information. Waiting for the reservation information of the relay device, if the random access of the UE does not cause a Preamble collision at the relay device, the relay device sends the reservation information to the eNB to reserve the Preamble resource; the eNB receives one of the UEs through After the reservation information sent by the relay device, the backoff information is still sent to all UEs that have a Preamble collision, and the reservation confirmation is fed back to the relay device.
  • the relay device After receiving the reservation confirmation, the relay device forwards the reservation confirmation to the corresponding UE.
  • the eNB notifies all UEs by means of a broadcast message or a bit-map, and the Preamble resource has been reserved. If the UE only receives the backoff information of the eNB, the UE can only perform the backoff. If the UE receives the backoff information and the reservation confirmation forwarded by the relay device, the UE does not need to evade, and the Preamble resource with the subscription is successfully used for accessing the LTE-Advanced network.
  • an embodiment of the present invention provides a random access control system, which is applied to a wireless cellular network that introduces a relay device.
  • the present invention includes a relay device 701 and a base station 702, where:
  • the relay device 701 is configured to reserve, by using a random access channel resource, an uplink synchronization code resource sent by the UE to the base station, to reserve the uplink synchronization code resource to the base station;
  • the base station 702 is configured to: when receiving the same uplink synchronization code resource that is sent by the at least two UEs on the same random access channel resource, feed back information to the at least two UEs, if one of the at least two UEs passes the medium
  • the relay device After the device reserves the uplink synchronization code resource, the relay device notifies the corresponding UE that the uplink synchronization code resource reservation is successful, so that the UE uses the uplink synchronization code resource with successful reservation to access the wireless cellular network, and notifies all UEs.
  • the uplink sync code resource has been reserved.
  • the base station 702 is further configured to: if at least two UEs are respectively pre-routed through different relay devices When the uplink synchronization code resource is about, it is determined that the uplink synchronization code resource reservation fails.
  • a possible structure of the relay device includes:
  • the reservation unit 801 is configured to reserve, by using a random access channel resource, an uplink synchronization code resource that is sent by the UE to the base station, and reserve the uplink synchronization code resource to the base station;
  • the forwarding unit 802 is configured to forward the notification to the corresponding UE when receiving the notification that the uplink synchronization code resource reservation returned by the base station is successful.
  • a possible structure of the base station device includes a receiving unit 901, a control unit 902, and a processing unit 903:
  • the receiving unit 901 is configured to receive an uplink synchronization code resource that is sent by the UE on the random access channel resource, and receive a reservation of the uplink synchronization code resource by the receiving UE by using the relay device.
  • the control unit 902 is configured to: when receiving the same uplink synchronization code resource that the at least two UEs send on the same random access channel resource, feed back information to the at least two UEs, if one of the at least two UEs passes
  • the relay device reserves the uplink synchronization code resource, and triggers the processing unit 903;
  • the processing unit 903 is configured to notify the corresponding UE that the uplink synchronization code resource reservation is successful by using the relay device, so that the UE uses the uplink synchronization code resource with a successful reservation to perform access of the wireless cellular network, and notifies all UEs of the uplink synchronization code.
  • the resource has been reserved.
  • control unit 902 is further configured to determine that the uplink synchronization code resource reservation fails if at least two UEs respectively reserve the uplink synchronization code resource through different relay devices.
  • the embodiment of the present invention further provides a user terminal device, as shown in FIG. 10, including: a random access initiating unit 1001, configured to randomly send an uplink synchronization code resource to a base station on a random access channel resource;
  • a random access initiating unit 1001 configured to randomly send an uplink synchronization code resource to a base station on a random access channel resource;
  • the random access processing unit 1002 is configured to: if receiving the notification that the uplink synchronization code resource reservation succeeded by the relay device is successful, and receiving the backoff information fed back by the base station, omitting the backoff information, and performing wireless reservation with the successfully reserved uplink synchronization code resource. Access to cellular networks.
  • the random access control method, system and device provided by the embodiments of the present invention are applied to a wireless cellular network that introduces a relay device, if the relay device receives one UE on any random access channel resource.
  • the uplink synchronization code resource sent to the base station reserves the uplink synchronization code resource to the base station; when an uplink synchronization code collision occurs at the base station, if one of the UEs reserves the uplink synchronization code resource to the base station through the relay device, the base station passes The relay device notifies the corresponding UE that the uplink synchronization code resource reservation is successful, and notifies all UEs that the uplink synchronization code resource has been reserved, and the UE may use the uplink synchronization code resource with a successful reservation to access the wireless cellular network.
  • the scheme of the uplink synchronization code resource is reserved by the relay device, so that the UE that successfully subscribes to the uplink synchronization code resource avoids backoff and accesses the wireless cellular network in time, thereby effectively reducing the access delay of the user and improving the user access. Efficiency, which enhances the user experience.

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Description

一种随机接入控制方法、 系统及设备 技术领域
本发明涉及无线通信领域， 尤其涉及一种应用于引入中继设备的无线蜂窝 网络的随机接入控制技术。 背景技术
3GPP ( 3rd Generation Partnership Project, 第三代移动通信标准化组织）已 启动了 LTE ( Long Term Evolution, 长期演进） 的标准化工作。 现有 LTE系统 采用基于碰撞的随机接入方案， 可以实现 UE ( User Equipment, 用户终端）的 上行同步和随机接入两个功能， UE首先完成上行同步过程， 才能继续之后的 连接建立过程。
如图 1所示， LTE系统中基于碰撞的随机接入方案包括如下步骤：
S 101、 UE在 PRACH ( Physical Random Access Channel , 物理随机接入信 道）资源上随机发送用于上行同步的 Preamble (引言）资源， 具体承载的信令 消息为 Random Access Preamble (随积接入引言）；
其中， PRACH资源为承载在 PRACH信道上的时频资源块， Preamble资 源是一种上行同步码资源； 在 LTE系统中， 共有 64个可用的 Preamble资源， UE可以随机选择一个 Preamble资源在 PRACH资源上发送；
S102、 eNB (基站）向 UE返回 Random Access Response (随机接入响应）， UE接收到 eNB返回的 Random Access Response, 完成上行同步过程；
如果 eNB接收到至少两个 UE在相同 PRACH资源上发送的同一 Preamble 资源， 则发生了上行同步码碰撞，在 LTE系统中也可称为 Preamble碰撞， eNB 会在 Random Access Response中反馈退避信息（也可以称为过载信息）， 使 UE 根据退避信息进行退避， 则 UE无法继续之后的连接建立过程， 流程结束； 如果没有发生 Preamble碰撞， eNB会在 Random Access Response中反馈 上行确认信息， 为 UE分配 Preamble资源， 使 UE可以继续之后的连接建立过 程；
5103、 UE根据上行确认信息所分配的 Preamble资源向 eNB发送接入请求 信息， 具体承载的信令消息为 Scheduled Transmission (预定的传输）；
5104、 eNB向 UE返回 Connection Resolution (连接决定）， 确认连接建立 即接入完成。
在未来的 LTE-Advanced (超长期演进） 系统中， Relaying Technology (中 继技术） 是扩大系统覆盖、 增加系统容量的候选技术之一， 这就需要在 LTE-Advanced网络中引入中继设备（或称中继节点）。 在 LTE-Advanced系统 中 ,仍然可以采用现有 LTE系统中基于碰撞的随机接入方案完成 UE的随机接 入过程。 但是在现有基于碰撞的随机接入方案中， 当多个 UE在相同 PRACH 资源上选择同一 Preamble资源进行随机接入时， 该多个 UE将发生 Preamble 碰撞， eNB会向发生 Preamble碰撞的所有 UE反馈退避信息， 使 UE根据退避 信息进行退避， 导致用户的接入时延较大、 接入效率较低， 从而严重影响了用 户体验。 发明内容
本发明提供一种随机接入控制方法及系统， 用以解决现有基于碰撞的随机 接入方案存在的用户接入时延较大、 接入效率较低的问题。
相应的， 本发明提供一种中继设备、 基站设备和用户终端设备。
本发明提供的随机接入控制方法， 应用于引入中继设备的无线蜂窝网络， 包括：
当至少两个用户终端在相同随机接入信道资源上向基站发送同一上行同 步码资源时， 基站向所述至少两个用户终端反馈退避信息；
如果所述至少两个用户终端中的其中一个用户终端通过中继设备向所述 基站预约所述上行同步码资源， 则基站通过该中继设备通知相应的用户终端所 述上行同步码资源预约成功，使该用户终端采用预约成功的上行同步码资源进 行无线蜂窝网络的接入； 并
通知所有用户终端所述上行同步码资源已被预约。
本发明提供的随机接入控制系统， 应用于引入中继设备的无线蜂窝网络， 包括中继设备和基站， 其中：
所述中继设备， 用于在任一随机接入信道资源上接收到一个用户终端向基 站发送的上行同步码资源时， 向所述基站预约所述上行同步码资源；
所述基站， 用于当接收到至少两个用户终端在相同随机接入信道资源上发 送的同一上行同步码资源时， 向所述至少两个用户终端反馈退避信息， 如果所 述至少两个用户终端中的其中一个用户终端通过中继设备预约所述上行同步 码资源， 则通过该中继设备通知相应的用户终端所述上行同步码资源预约成 功， 使该用户终端采用预约成功的上行同步码资源进行无线蜂窝网络的接入， 并通知所有用户终端所述上行同步码资源已被预约。
本发明提供的中继设备， 包括：
预约单元， 用于在任一随机接入信道资源上接收到一个用户终端向基站发 送的上行同步码资源时， 向所述基站预约所述上行同步码资源；
转发单元， 用于在接收到所述基站返回的所述上行同步码资源预约成功的 通知时， 将所述通知转发给相应的用户终端。
本发明提供的基站设备， 应用于引入中继设备的无线蜂窝网络， 包括接收 单元、 控制单元和处理单元， 其中：
所述接收单元， 用于接收用户终端在随机接入信道资源上发送的上行同步 码资源， 以及接收用户终端通过中继设备对上行同步码资源的预约；
所述控制单元， 用于当接收到至少两个用户终端在相同随机接入信道资源 上发送的同一上行同步码资源时， 向所述至少两个用户终端反馈退避信息， 如 果所述至少两个用户终端中的其中一个用户终端通过中继设备预约所述上行 同步码资源， 则触发所述处理单元； 所述处理单元， 用于通过该中继设备通知相应的用户终端所述上行同步码 资源预约成功，使该用户终端采用预约成功的上行同步码资源进行无线蜂窝网 络的接入， 并通知所有用户终端所述上行同步码资源已被预约。
本发明提供的用户终端设备，应用于引入中继设备的无线蜂窝网络，包括： 随机接入发起单元， 用于在随机接入信道资源上向基站随机发送上行同步 码资源；
随机接入处理单元， 用于如果接收到中继设备发送的所述上行同步码资源 预约成功的通知、并且接收到所述基站反馈的退避信息，则忽略所述退避信息， 采用预约成功的上行同步码资源进行无线蜂窝网络的接入。
本发明提供的随机接入控制方法、 系统及设备， 应用于引入中继设备的无 线蜂窝网络， 如果中继设备在任一随机接入信道资源上接收到一个用户终端向 基站发送的上行同步码资源， 则向基站预约该上行同步码资源； 当在基站处发 生上行同步码碰撞时， 如果其中一个用户终端通过中继设备向基站预约该上行 同步码资源， 则基站通过该中继设备通知相应的用户终端该上行同步码资源预 约成功， 通知所有用户终端该上行同步码资源已被预约； 如果用户终端接收到 退避信息、 以及接收到上行同步码资源预约成功的通知， 则忽略退避信息， 采 用预约成功的上行同步码资源进行无线蜂窝网络的接入。本发明通过中继设备 对上行同步码资源的预约机制，使上行同步码资源预约成功的用户终端避免退 避而及时接入无线蜂窝网络， 从而有效降低了用户的接入时延， 提高了用户的 接入效率， 从而提升了用户体验。 附图说明
图 1为现有技术中 LTE系统的随机接入方案流程图；
图 2为本发明实施例中对接入路径的比较示意图；
图 3为本发明实施例中随机接入控制方法流程图；
图 4为实施例一中 LTE-Advanced系统的随机接入控制方法流程图； 图 5为实施例二中 LTE-Advanced系统的随机接入控制方法流程图； 图 6为实施例三中 LTE-Advanced系统的随机接入控制方法流程图； 图 7为本发明实施例中随机接入控制系统框图；
图 8为本发明实施例中中继设备的结构框图；
图 9为本发明实施例中基站的结构框图；
图 10为本发明实施例中用户终端的结构框图。 具体实施方式
在引入中继设备的无线蜂窝网络中， 例如 LTE-Advanced网络中， 中继设 备作为扩大系统覆盖、 增加系统容量的一种有效方式， 可以与基站共同覆盖一 片区域。 由于中继设备与基站的发射功率不同， 导致中继设备与基站覆盖的 UE数量不同， 如果中继覆盖区域内的 UE1与中继覆盖区域外的 UE2在相同 PRACH 资源上向基站发送同一 Preamble 资源， 可以通过中继设备预约该 Preamble资源， 使中继覆盖区域内的碰撞用户 UE1避免退避而及时接入该无 线蜂窝网络， 从而降低了用户的接入时延， 提高了用户的接入效率， 提升了用 户体验。
以 LTE-Advanced 系统为例对接入路径进行比较说明。 如图 2 所示， 在 LTE-Advanced系统中引入了中继设备， 仍然可以采用现有 LTE系统中基于碰 撞的随机接入方案完成 UE的随机接入过程， 接入路径如图 2中的接入路径 1 所示； 而釆用本发明实施例提供的随机接入方案完成 UE的随机接入过程时， 接入路径如图 2中的接入路径 2所示。
如图 3所示， 本发明实施例提供的随机接入控制方法， 应用于引入中继设 备的无线蜂窝网络， 包括如下步骤：
S301、 当至少两个 UE在相同随机接入信道资源上向基站发送同一上行同 步码资源时， 基站向该至少两个 UE反馈退避信息；
S302、 如果至少两个 UE中的其中一个 UE通过中继设备向基站预约该上 行同步码资源， 则基站通过该中继设备通知相应的 UE该上行同步码资源预约 成功， 其中， 上行同步码资源预约成功的通知用于指示该 UE忽略退避信息， 采用预约成功的上行同步码资源进行无线蜂窝网络的接入， 并通知所有 UE该 上行同步码资源已被预约；
需要指出的是， 对于接入其中一个 UE的中继设备， UE可以通过该中继 设备向基站预约该上行同步码资源， 而对于同时接入了其中多个 UE的中继设 备， 在该中继设备处也发生了上行同步码碰撞， 则该中继设备不会向基站预约 该上行同步码资源；
相应的， 如果该至少两个 UE中的其中一个 U5, 接收到该上行同步码资 源预约成功的通知、 并且接收到退避信息， 则忽略退避信息， 采用预约成功的 上行同步码资源进行无线蜂窝网络的接入；
如果该至少两个 UE中的其中一个 UE， 仅接收到退避信息， 则与现有技 术中一致， 根据退避信息进行退避。
较佳的， 如果至少两个 UE分别通过不同的中继设备向基站预约该上行同 步码资源， 则基站判定该上行同步码资源预约失败； 基站在判定该上行同步码 资源预约失败之后， 也可以通过中继设备通知相应的 UE该上行同步码资源预 约失败。
如果基站没有接收到中继设备对该上行同步码资源的预约， 则与现有技术 中一致， 基站向该至少两个 UE反馈退避信息。
本发明实施例提供的随机接入方案， 适用于引入中继设备的无线蜂窝网 络，例如 LTE-Advanced网络及其后续演进网络、 WiMAX( World Interoperability for Microwave Access, 全球微波接入互操作性） 网络， 等等。 本发明实施例中 所述的基站具体是指 LTE-Advanced网络及其后续演进网络中的 eNB, WiMAX 网络中的 BS ( Base Station )， 等等。
下面将结合说明书附图， 以 LTE-Advanced网络为例对本发明实施例提供 的随机接入方案进行详细说明。 LTE-Advanced系统中包括 eNB、 中继设备和 多个 UE， 其中， 随机接入信道资源具体是指 PRACH资源， 上行同步码资源 具体是指 Preamble资源。
针对不同的应用场景分别进行介绍。
实施例一
本实施例中， 假设在相同 PRACH资源上 UE1和 UE2选择同一 Preamble 资源发起随机接入过程， UE1在中继设备 1的覆盖区域内， UE2没有在任何中 继设备的覆盖区域内， 如图 4所示， 则包括如下步骤：
5401、 UE1和 UE2分别在相同 PRACH资源上，通过 PRACH信道向 eNB 发送用于上行同步的 Preamble资源， 具体承栽的信令消息为 Random Access Preamble (随机接入引言）；
在 LTE-Advanced系统中， 可用的 Preamble资源共有 64个；
5402、 eNB接收到 UE1和 UE2在相同 PRACH资源上发送的同一 Preamble 资源， 则在 eNB处发生了 Preamble碰撞；
由于在 eNB处发生了 Preamble碰撞， eNB需要向 UE1和 UE2反馈退避 信息， 一般情况下， 退避信息在 10ms之内反馈即可；
5403、 中继设备 1在当前 PRACH资源上接收到一个用户终端即 UE1向 eNB发送的 Preamble 资源， 则向 eNB发送预约信息， 预约信息用于预约该 Preamble资源；
5404、 eNB向 UE1和 UE2反馈退避信息；
5405、 eNB接收到 UE1通过中继设备 1对该 Preamble资源的预约， 则通 过中继设备 1向 UE1发送预约确认， 通知 UE1该 Preamble资源预约成功；
5406、 eNB通知所有 UE该 Preamble资源已被预约；
eNB通知所有 UE该 Preamble资源已被预约可以保证后续 UE1的随机接 入过程顺利进行， eNB可以在广播信道上通过广播消息的方式通知所有 UE该 Preamble资源已被预约， 也可以通过 bit-map (比特映射 )的方式通知所有 UE 该 Preamble资源已被预约； 其中， bit-map的方式是指针对 64个 Preamble资源分别设置比特位，如果 某一个 Preamble资源对应的比特位设置为 1， 表明该 Preamble资源已被预约， 比特位设置为 0， 表明该 Preamble资源未被预约；
S407、接收到预约确认以及退避信息的 UE1 , 忽略退避信息， 采用预约成 功的 Preamble资源进行 LTE- Advanced网络的接入；仅接收到退避信息的 UE2， 根据退避信息进行退避。
需要指出的是， S404与 S405只是为了描述方便而给出了步骤编号， 实际 上两步據之间并无严格的时序关系。
实施例二
本实施例中， 假设在相同 PRACH资源上 UE1和 UE2选择同一 Preamble 资源发起随机接入过程， UE1在中继设备 1的覆盖区域内， UE2在中继设备 2 的覆盖区域内， 如图 5所示， 则包括如下步骤：
5501、 UE1和 UE2在相同 PRACH资源上， 通过 PRACH信道向 eNB发 送用于上行同步的 Preamble 资源， 具体承载的信令消息为 Random Access Preamble (随机接入引言）；
5502、 eNB接收到 UE1和 UE2在相同 PRACH资源上发送的同一 Preamble 资源 , 则在 eNB处发生了 Preamble碰撞；
5503、 中继设备 1在当前 PRACH资源上接收到一个用户终端即 UE1向 eNB发送的 Preamble 资源， 则向 eNB发送预约信息， 预约信息用于预约该 Preamble资源； 中继设备 2在当前 PRACH资源上接收到一个用户终端即 UE2 向 eNB发送的 Preamble资源， 则向 eNB发送预约信息， 预约信息用于预约该 Preamble资源；
5504、 eNB向 UE1和 UE2反馈退避信息；
5505、 eNB 同时接收到两个中继设备即中继设备 1 和中继设备 2对该 Preamble资源的预约， 则判定该 Preamble资源预约失败；
5506、 仅接收到退避信息的 UE1和 UE2， 根据退避信息进行退避。 需要指出的是， S504与 S505只是为了描述方便而给出了步骤编号， 实际 上两步骤之间并无严格的时序关系。
实施例三
本实施例中， 假设在相同 PRACH 资源上 UE1、 UE2和 UE3 选择同一 Preamble资源发起随机接入过程， UE1在中继设备 1 的覆盖区域内， UE2和 UE3在中继设备 2的覆盖区域内， 如图 6所示， 则包括如下步骤：
S601、 UE1、 UE2和 UE3在相同 PRACH资源上，通过 PRACH信道向 eNB 发送用于上行同步的 Preamble资源， 具体承栽的信令消息为 Random Access Preamble (随机接入引言）；
5602、 eNB接收到 UE1、 UE2和 UE3在相同 PRACH资源上发送的同一 Preamble资源， 则在 eNB处发生了 Preamble碰撞；
5603、 中继设备 1在当前 PRACH资源上接收到一个用户终端即 UE1向 eNB发送的 Preamble 资源， 则向 eNB发送预约信息， 预约信息用于预约该 Preamble资源；
中继设备 2在当前 PRACH资源上接收到两个用户终端即 UE2和 UE3向 eNB发送的 Preamble资源， 则在中继设备 2处也发生了 Preamble碰撞， 中继 设备 2不会向 eNB发送预约信息；
5604、 eNB向 UE1、 UE2和 UE3反馈退避信息；
5605、 eNB接收到 UE1通过中继设备 1对该 Preamble资源的预约， 则通 过中继设备 1向 UE1发送预约确认， 通知 UE1该 Preamble资源预约成功；
5606、 eNB通知所有 UE该 Preamble资源已被预约；
eNB通知所有 UE该 Preamble资源已被预约可以保证后续 UE1的随机接 入过程顺利进行， eNB可以在广播信道上通过广播消息的方式通知所有 UE该 Preamble资源已被预约， 也可以通过 bit-map (比特映射） 的方式通知所有用 户终端该 Preamble资源已被预约；
5607、接收到预约确认以及退避信息的 UE1 , 忽略退避信息， 采用预约成 功的 Preamble资源进行 LTE- Advanced网络的接入； 仅接收到退避信息的 UE2 和 UE3， 根据退避信息进行退避。
需要指出的是， S604与 S605只是为了描述方便而给出了步骤编号， 实际 上两步糠之间并无严格的时序关系。
本发明实施例提供的 LTE-Advanced 系统中的随机接入控制方法， 若在 eNB处发生了 Preamble碰撞， eNB并不直接对所有发生了 Preamble碰撞的 UE 发送退避信息， 促使 UE根据退避信息进行退避， 而是等待中继设备的预约信 息， 如果 UE的随机接入在中继设备处没有发生 Preamble碰撞， 则中继设备向 eNB发送预约信息，预约该 Preamble资源； eNB在接收到其中一个 UE通过中 继设备发送的预约信息后，仍然向所有发生了 Preamble碰撞的 UE发送退避信 息， 同时向中继设备反馈预约确认， 中继设备接收到预约确认之后， 即刻向相 应的 UE转发该预约确认。 eNB会通过广播消息或者 bit-map的方式通知所有 UE, 该 Preamble资源已被预约。 如果 UE仅接收到 eNB的退避信息， 则只能 进行退避； 如果 UE接收到退避信息以及中继设备转发的预约确认， 则无需退 避， 采用预约成功的 Preamble资源进行 LTE- Advanced网络的接入。
基于同一技术构思， 本发明实施例提供了一种随机接入控制系统， 应用于 引入中继设备的无线蜂窝网络， 如图 7所示， 包括中继设备 701和基站 702， 其中：
中继设备 701 , 用于在任一随机接入信道资源上接收到一个 UE向基站发 送的上行同步码资源时， 向基站预约该上行同步码资源；
基站 702， 用于当接收到至少两个 UE在相同随机接入信道资源上发送的 同一上行同步码资源时， 向至少两个 UE反馈退避信息， 如果至少两个 UE中 的其中一个 UE通过中继设备预约该上行同步码资源， 则通过该中继设备通知 相应的 UE该上行同步码资源预约成功， 使该 UE采用预约成功的上行同步码 资源进行无线蜂窝网络的接入， 并通知所有 UE该上行同步码资源已被预约。
较佳的， 基站 702, 还用于如果至少两个 UE分别通过不同的中继设备预 约该上行同步码资源， 则判定该上行同步码资源预约失败。
其中， 中继设备的一种可能结构， 如图 8所示， 包括：
预约单元 801， 用于在任一随机接入信道资源上接收到一个 UE向基站发 送的上行同步码资源时， 向该基站预约该上行同步码资源；
转发单元 802, 用于在接收到基站返回的该上行同步码资源预约成功的通 知时， 将该通知转发给相应的 UE。
其中， 基站设备的一种可能结构， 如图 9所示， 包括接收单元 901、 控制 单元 902、 处理单元 903:
接收单元 901， 用于接收 UE在随机接入信道资源上发送的上行同步码资 源， 以及接收 UE通过中继设备对上行同步码资源的预约；
控制单元 902 , 用于当接收到至少两个 UE在相同随机接入信道资源上发 送的同一上行同步码资源时，向至少两个 UE反馈退避信息，如果至少两个 UE 中的其中一个 UE通过中继设备预约上行同步码资源， 则触发处理单元 903;
处理单元 903， 用于通过该中继设备通知相应的 UE该上行同步码资源预 约成功， 使该 UE采用预约成功的上行同步码资源进行无线蜂窝网络的接入， 并通知所有 UE该上行同步码资源已被预约。
较佳的， 控制单元 902， 还用于如果至少两个 UE分别通过不同的中继设 备预约该上行同步码资源 , 则判定该上行同步码资源预约失败。
相应的， 本发明实施例还提供一种用户终端设备， 如图 10所示， 包括： 随机接入发起单元 1001，用于在随机接入信道资源上向基站随机发送上行 同步码资源；
随机接入处理单元 1002，用于如果接收到中继设备发送的上行同步码资源 预约成功的通知、 并且接收到基站反馈的退避信息， 则忽略退避信息， 采用预 约成功的上行同步码资源进行无线蜂窝网络的接入。
本发明实施例提供的随机接入控制方法、 系统及设备， 应用于引入中继设 备的无线蜂窝网络， 如果中继设备在任一随机接入信道资源上接收到一个 UE 向基站发送的上行同步码资源， 则向基站预约该上行同步码资源； 当在基站处 发生上行同步码碰撞时， 如果其中一个 UE通过中继设备向基站预约该上行同 步码资源，则基站通过该中继设备通知相应的 UE该上行同步码资源预约成功， 通知所有 UE该上行同步码资源已被预约， 该 UE可以采用预约成功的上行同 步码资源进行无线蜂窝网络的接入。本方案通过中继设备对上行同步码资源的 预约机制， 使上行同步码资源预约成功的 UE避免退避而及时接入无线蜂窝网 络， 从而有效降低了用户的接入时延， 提高了用户的接入效率， 从而提升了用 户体验。
显然， 本领域的技术人员可以对本发明进行 种改动和变型而不脱离本发 明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要求及 其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种随机接入控制方法， 应用于引入中继设备的无线蜂窝网络， 其特 征在于， 包括：
当至少两个用户终端在相同随机接入信道资源上向基站发送同一上行同 步码资源时， 基站向所述至少两个用户终端反馈退避信息；
如果所述至少两个用户终端中的其中一个用户终端通过中继设备向所述 基站预约所述上行同步码资源， 则基站通过该中继设备通知相应的用户终端所 述上行同步码资源预约成功，使该用户终端采用预约成功的上行同步码资源进 行无线蜂窝网络的接入； 并
通知所有用户终端所述上行同步码资源已被预约。
2、 如权利要求 1所述的方法， 其特征在于， 还包括： 行同步码资源， 则基站判定所述上行同步码资源预约失败。
3、 如权利要求 1 所述的方法， 其特征在于， 所述基站通过广播消息或者 比特映射 bit-map的方式， 通知所有用户终端所述上行同步码资源已被预约。
4、 如权利要求 1所述的方法， 其特征在于， 还包括：
接收到所述上行同步码资源预约成功的通知、并且接收到所述退避信息的 用户终端， 忽略所述退避信息， 采用预约成功的上行同步码资源进行无线蜂窝 网络的接入。
5、 如权利要求 1至 4任一所述的方法， 其特征在于， 所述引入中继设备 的无线蜂窝网络为超长期演进' LTE-advanced 网络， 以及所述随机接入信道资 源为物理随机接入信道 PRACH资源，所述上行同步码资源为引言 Preamble资 源。
6、 一种随机接入控制系统， 应用于引入中继设备的无线蜂窝网络， 包括 中继设备和基站， 其特征在于， 其中： 所述中继设备， 用于在任一随机接入信道资源上接收到一个用户终端向基 站发送的上行同步码资源时， 向所述基站预约所述上行同步码资源；
所述基站， 用于当接收到至少两个用户终端在相同随机接入信道资源上发 送的同一上行同步码资源时， 向所述至少两个用户终端反馈退避信息， 如果所 述至少两个用户终端中的其中一个用户终端通过中继设备预约所述上行同步 码资源， 则通过该中继设备通知相应的用户终端所述上行同步码资源预约成 功， 使该用户终端采用预约成功的上行同步码资源进行无线蜂窝网络的接入， 并通知所有用户终端所述上行同步码资源已被预约。
7、 如权利要求 6所述的系统， 其特征在于，
所述基站，还用于如果所述至少两个用户终端分别通过不同的中继设备预 约所述上行同步码资源， 则判定所述上行同步码资源预约失败。
8、 一种中继设备， 其特征在于， 包括：
预约单元， 用于在任一随机接入信道资源上接收到一个用户终端向基站发 送的上行同步码资源时， 向所述基站预约所述上行同步码资源；
转发单元， 用于在接收到所述基站返回的所述上行同步码资源预约成功的 通知时， 将所述通知转发给相应的用户终端。
9、 一种基站设备， 应用于引入中继设备的无线蜂窝网络， 其特征在于， 包括接收单元、 控制单元和处理单元， 其中：
所述接收单元， 用于接收用户终端在随机接入信道资源上发送的上行同步 码资源， 以及接收用户终端通过中继设备对上行同步码资源的预约；
所述控制单元， 用于当接收到至少两个用户终端在相同随机接入信道资源 上发送的同一上行同步码资源时， 向所述至少两个用户终端反馈退避信息， 如 果所述至少两个用户终端中的其中一个用户终端通过中继设备预约所述上行 同步码资源， 则触发所述处理单元；
所述处理单元， 用于通过该中继设备通知相应的用户终端所述上行同步码 资源预约成功，使该用户终端釆用预约成功的上行同步码资源进行无线蜂窝网 络的接入， 并通知所有用户终端所述上行同步码资源已被预约。
10、 如权利要求 9所述的基站设备， 其特征在于，
所述控制单元，还用于如果至少两个用户终端分别通过不同的中继设备预 约所述上行同步码资源， 则判定所述上行同步码资源预约失败。
11、 一种用户终端设备， 应用于引入中继设备的无线蜂窝网络， 其特征在 于， 包括：
随机接入发起单元， 用于在随机接入信道资源上向基站随机发送上行同步 码资源；
随机接入处理单元， 用于如果接收到中继设备发送的所述上行同步码资源 预约成功的通知、并且接收到所述基站反馈的退避信息，则忽略所述退避信息， 采用预约成功的上行同步码资源进行无线蜂窝网络的接入。
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