WO2007045152A1 - Procede d’acces d’une station de base par une station d’abonne sous la condition de multiples stations de base - Google Patents

Procede d’acces d’une station de base par une station d’abonne sous la condition de multiples stations de base Download PDF

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Publication number
WO2007045152A1
WO2007045152A1 PCT/CN2006/002641 CN2006002641W WO2007045152A1 WO 2007045152 A1 WO2007045152 A1 WO 2007045152A1 CN 2006002641 W CN2006002641 W CN 2006002641W WO 2007045152 A1 WO2007045152 A1 WO 2007045152A1
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Prior art keywords
ranging
base station
configuration information
belongs
information table
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PCT/CN2006/002641
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English (en)
French (fr)
Inventor
Keliang Zhang
Liubo Mei
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007045152A1 publication Critical patent/WO2007045152A1/zh
Priority to US12/106,194 priority Critical patent/US8185106B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to the field of wireless broadband access technologies, and in particular, to a method for accessing a base station (BS, Base Station) by a subscriber station (SS, Subscriber Station) in a multi-base station environment.
  • BS Base Station
  • SS Subscriber Station
  • the wireless broadband access device based on the 802.16d protocol.
  • One of them is that the client SS accesses only a fixed BS according to the network plan.
  • One of the advantages of this access method is that the development and management of the device is relatively simple, and since the SS only accesses the fixed BS, configuration information such as the quality of service (QoS) policy of the user can be configured to the BS, thereby conveniently Different QoS configuration management for different SSs is implemented.
  • QoS quality of service
  • the SS If the SS is fixedly connected to a BS, configuration information such as all QoS policies for the SS and information for determining the ownership of the SS can be statically configured to the BS. At this time, if the SS accesses another BS, the other BS cannot retrieve the configuration information of the SS, and the SS access is rejected. Therefore, the SS can access the network only by accessing the BS that stores its configuration information. It can be seen that the above access method is not problematic in an area covered by only one BS, but when the SS is located in two or several BS coverage overlapping areas, there may be a long time that the SS cannot access the network. Case.
  • the SS is located in the overlapping area of the two base stations BS1 and BS2, and the configuration information of the SS is configured on the BS1. If, during a certain period of time, the signal of BS2 is strong, after SS is started, it may scan to access BS2. When the BS2 check finds that there is no configuration information of the SS, no service connection is established for the SS. At the same time, since BS2 does not have any mechanism to inform the SS to terminate its connection with BS2, it reconnects to BS1, so that the SS is meaninglessly connected to BS2, unable to access the network and cannot be detached from BS2. Summary of the invention
  • the present invention provides a method for an SS to access a BS in a multi-BS environment and an applied BS to overcome the problem that the SS may not be able to access the network or exit from other networks when the SS is required to access the fixed BS. .
  • the method for accessing a base station by a SS in a multi-BS environment includes:
  • the ranging process is started, and a ranging request is sent to the BS;
  • the BS checks whether the SS belongs to the BS, and if not belongs to the BS, sends a termination ranging response to the SS;
  • the SS After receiving the termination ranging response, the SS interrupts the ranging process of the BS, and reselects a new channel for ranging until accessing the correct BS.
  • the base station of the present invention mainly includes:
  • the ranging module is configured to cooperate with the user station SS to complete the ranging function
  • the SS authentication module is connected to the ranging module, and is configured to save its own SS configuration information table. After receiving the ranging request from the SS through the ranging module, determine whether the SS belongs to the BS, and determine When the SS is not attributed to the BS, the ranging module is controlled to send a termination ranging response to the SS.
  • the present invention solves the access problem when the SS is located in the overlapping coverage area of two or more BSs by using the control process to join the BS to the access authentication and ranging process of the SS, so that the SS is connected.
  • the SS performs redirection when it does not belong to the BS, exits the ranging process, and reselects a new channel for ranging until accessing the correct BS.
  • the subscriber station may not be able to access the network or exit from other networks, and the invention only needs to modify the ranging procedure of the BS, and the SS measurement
  • the process is completely processed according to the process specified in the agreement, and does not require any additional modifications, which is very convenient and practical.
  • Figure 1 is a schematic diagram of a network location where SSs are located in two BS overlapping regions;
  • FIG. 2 is a flowchart of a method for an SS to access a base station in a multi-base station environment according to a preferred embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a BS initial ranging device according to a preferred embodiment of the present invention
  • FIG. 4 is a schematic diagram of an SS access process according to a preferred embodiment of the present invention
  • FIG. 5 shows the internal structure of a BS given by a preferred embodiment of the present invention. Mode for carrying out the invention
  • a preferred embodiment of the present invention provides a method for an SS to access a base station in a multi-base station environment.
  • the main process is as shown in FIG. 2, and includes the following steps:
  • the SS starts the ranging process and sends a ranging request to the BS.
  • step B The BS checks whether the SS belongs to the BS, and if it is not at the BS, performs step C; if the BS checks that the SS belongs to the BS, step E is performed.
  • the BS determines whether the SS belongs to itself by checking its own SS configuration information table.
  • the checking process specifically includes: the BS checks whether the SS is in its own SS configuration information table, and if not in its own SS configuration information table, the SS does not belong to the BS; if the SS configuration information in itself In the table, the SS is attributed to the BS. For example, if the MAC address of all the SSs belonging to the BS is recorded in the SS configuration information table, the BS may check whether the SS belongs to the BS according to whether the MAC address of the accessed SS is in its own SS configuration information table. .
  • the interrupt and the BS's ranging process are re-determined. Re-select the new channel to the process for the ranging process until the correct BS is accessed.
  • the BS sends a ranging success response to the SS, and the SS accesses the BS.
  • the inspections described in this step are defined in detail in the relevant process of 802.16d, such as checking whether the signal quality is good enough.
  • FIG. 3 is a schematic diagram of a BS initial ranging procedure according to the foregoing step A in the preferred embodiment of the present invention.
  • the ranging process is used to obtain parameters such as a time offset of a SS transmission and a transmission power.
  • the initial ranging process mainly includes:
  • the BS receives the ranging request message from the SS RNG-REQ;
  • the R G-REQ is a packet sent during the ranging process, and is used to determine network delay, transmit power, and modification of the downlink transmission mode.
  • the BS judges whether the link identifier CID (Connection identifier) carried by the RNG-REQ is all zeros. If not all zeros, the next step is processed according to the procedure specified in the 802.16d protocol;
  • the CID is a link identifier defined in the 802.16d protocol, and according to the protocol, the all-zero CID is used for message transmission in the ranging process;
  • the SS is allowed to access the BS, it is further determined according to the 802.16d protocol.
  • the SS transfers to another channel processing. If not, the next step is continued according to the 802.16d protocol;
  • the BS adds the SS to the SS after receiving the RNG-REQ. Ownership judgment, if the parameters of the SS are not configured in the BS, indicating that the SS should not access the current BS, the SS response and the ranging procedure of the BS are required in the ranging response RNG-RSP sent to the SS, according to 802.16d.
  • the protocol defined procedure reselects the new channel for the ranging process until the correct BS is accessed.
  • FIG. 4 is a schematic diagram of an access process of an SS according to a preferred embodiment of the present invention. This embodiment is described by taking an overlay of only two base stations BS1 and BS2 as an example. It should be noted that the above method is also applicable when there are two or more BSs covering overlapping regions.
  • the initial ranging process it is determined whether the SS is allowed to access the current BS. If not, the ranging process is interrupted, and the SS is searched for other channels and accesses other BSs. Proceed as follows:
  • the SS first scans the signal to the base station BS1 and starts the ranging process
  • the SS sends the RNG-REQ to the BS1, and then waits for the BS1 to reply to the RNG-RSP.
  • the BS1 is in its own SS configuration information table, and checks whether the SS is in its own SS configuration information table.
  • BS1 If the SS is not in the SS configuration information table of BS1, BS1 sends RNG-RSP Abort to SS;
  • the SS After receiving the RNG-RSP Abort, the SS interrupts the ranging process of itself and BS 1, and transfers to the next frequency point, for example, the frequency point where the BS2 is located, to start a new ranging process;
  • the SS sends R G-REQ to BS2, and then waits for BS2 to reply to RNG-RSP;
  • the BS2 checks whether the SS is in its own SS configuration information table according to its SS configuration information table.
  • the BS2 sends a ranging success response RNG-RSP Success to the SS;
  • the SS After receiving the RNG-RSP Success, the SS accesses the BS2 and continues to follow 802.16d.
  • the standard specifies the next step in the initialization process.
  • the initialization process is a very long process, and ranging is only one of them.
  • FIG. 5 shows the internal structure of the BS according to the preferred embodiment of the present invention. It can be seen that, in addition to the ranging module that completes the ranging process with the SS, the BS further includes an SS authentication module connected to the ranging module, which is used to save the SS configuration information table and is received by the ranging module. After the ranging request from the SS, it is determined whether the SS belongs to the BS, and when it is determined that the SS is not attributed to the BS, the ranging module is controlled to send a termination ranging response to the SS.
  • the preferred embodiment of the present invention adopts a control procedure to join the BS to the SS access authentication process and the ranging procedure, so that the SS needs to perform authentication when accessing the BS, when the SS does not When it belongs to the BS, it withdraws from the ranging procedure, and reselects a new channel for ranging until accessing the correct BS, thereby solving the access problem when the SS is located in the overlapping coverage area of the two BSs.
  • Those skilled in the art can understand that the above method only needs to modify the ranging process of the BS, and the ranging process of the SS is completely processed according to the procedure specified in the protocol, and does not require any additional modifications, and is very convenient and practical.

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

Description

多基站环境下用户站接入基站的方法
技术领域
本发明涉及无线宽带接入技术领域， 尤其涉及一种多基站环境下用 户站（SS, Subscriber Station )接入基站（BS, Base Station ) 的方法。 发明背景
基于 802.16d协议的无线宽带接入设备有很多应用场景， 其中之一 就是客户端 SS根据网络规划只接入某个固定的 BS。 这种接入方式的优 点之一就是设备的开发以及管理比较简单， 并且由于 SS只接入固定的 BS, 因此可以把该用户的服务质量（QoS )策略等配置信息配置到 BS， 从而方便地实现对不同 SS的不同 QoS配置管理。
如果将 SS固定接入某个 BS, 针对该 SS的所有 QoS策略以及判断 SS归属的信息等配置信息都可以静态配置到 BS。此时，如果该 SS接入 别的 BS， 别的 BS检索不到该 SS的配置信息， 就会拒绝该 SS接入， 这 样， SS只有接入保存其配置信息的 BS才能接入网络。 由此可以看出， 上述接入方式在只有一个 BS覆盖的地区是不会有问题的，但是当 SS位 于两个或几个 BS覆盖交叠区时就可能会存在 SS长时间无法接入网络的 情况。
如图 1所示， SS位于两个基站 BS1和 BS2的交叠区，且 SS的配置 信息都配置在 BS1上。 如果在某个时间段， 由于 BS2的信号强， SS启 动后， 可能会扫描接入到 BS2上。 当 BS2检查发现没有该 SS的配置信 息时， 就不会为该 SS建立业务连接。 同时由于 BS2没有任何机制通知 SS终止其和 BS2的连接，使其重新连接到 BS1上，这样 SS就被毫无意 义的挂到 BS2上， 无法接入网络也无法从 BS2退出。 发明内容
本发明提供了在多 BS环境下 SS接入 BS的方法以及所应用的 BS， 以克服现有技术要求 SS接入固定 BS的情况下， SS可能无法接入网络 也无法从其它网络退出的问题。
本发明所述在多 BS环境下 SS接入基站的方法， 包括：
SS扫描到某一 BS的信号后， 启动测距过程， 向所述 BS发送测距 请求；
该 BS检查所述 SS是否归属于本 BS， 若不归属于本 BS, 则发送终 止测距响应给所述 SS;
所述 SS收到终止测距响应后， 中断和所述 BS的测距过程， 重新选 择新的信道进行测距， 直到接入正确的 BS。
本发明所述的基站主要包括：
测距模块， 用于配合用户站 SS完成测距功能；
SS认证模块， 连接到所述测距模块， 用于保存自身的 SS配置信息 表， 在通过测距模块收到来自 SS的测距请求后， 判断该 SS是否归属于 本 BS, 并在判断得到 SS不归属于本 BS时， 控制所述测距模块发送终 止测距响应到所述 SS
由此可以看出，本发明通过采用控制流程将 BS对 SS的接入认证和 测距流程相接合，解决了当 SS位于两个以上 BS交叠覆盖区域时的接入 问题， 使 SS在接入 BS时进行认证， 在 SS不归属于该 BS时进行重定 向， 退出测距流程， 重新选择新的信道进行测距， 直到接入正确的 BS。 从而克服了现有技术要求用户站接入固定基站的情况下， 用户站可能无 法接入网络也无法从其它网络退出的缺点， 并且本发明仅需对 BS的测 距流程进行修改， SS的测距流程完全按协议中规定的流程处理， 不需要 任何额外的修改， 非常方便实用。 附图简要说明
图 1为 SS位于两个 BS交叠区的网络位置示意图；
图 2为本发明优选实施例所述的在多基站环境下 SS接入基站的方 法流程图；
图 3为本发明优选实施例所述的 BS初始化测距部分流程示意图； 图 4为本发明优选实施例所述的 SS的接入过程示意图；
图 5显示了本发明优选实施例给出的 BS的内部结构。 实施本发明的方式
下面结合附图和本发明的优选实施例对本发明作进一步详细说明。 本发明优选实施例给出了多基站环境下 SS接入基站的方法， 主要 过程如图 2所示， 包括以下步驟：
A: 在初始化测距（initial Ranging )过程中， SS在扫描到某一 BS 的信号后， 启动测距过程， 向该 BS发送测距请求。
B: 所述 BS检查该 SS是否归属于该 BS, 若不归属于该 BS， 则执 行步骤 C; 若 BS检查该 SS是归属于该 BS, 则执行步骤 E。
在该步骤中 , 所述 BS通过检查自身的 SS配置信息表来判断该 SS 是否归属于自身。所述检查过程具体包括： 所述 BS检查所述 SS是否在 自身的 SS配置信息表中， 若不在自身的 SS配置信息表中， 则该 SS不 归属于该 BS; 若在自身的 SS配置信息表中， 则该 SS归属于该 BS。 例 如， 若 SS配置信息表中记录了归属于该 BS的所有 SS的 MAC地址， 则 BS可以根据所接入的 SS的 MAC地址是否在自身 SS配置信息表中 来检查该 SS是否归属于本 BS。
C: 所述 BS发送终止测距响应给该 SSo
D: SS收到终止测距响应后， 中断和该 BS的测距过程， 通过重定 向过程重新选择新的信道进行测距过程， 直到接入正确的 BS。
E: 若 SS通过该 BS测距过程的所有检查， 则该 BS发送测距成功 响应给该 SS, SS接入该 BS。
该步職所述的检查在 802.16d的相关流程中有详细的定义， 例如检 查信号质量是否足够好等等。
图 3为本发明优选实施例中上述步骤 A所述的 BS初始化测距流程 示意图， 通常情况下， 测距过程用于获取 SS发射的时间偏移以及发射 功率等参数。 如图 3所示， 该初始化测距过程主要包括：
1、 BS接收来自 SS的测距请求报文 RNG-REQ;
其中， R G-REQ是在测距过程中发送的报文， 用来判断网络延时、 发射功率以及下行发送模式的修改等；
2、 BS判断 RNG-REQ 载的链路标识 CID ( Connection identifier ) 是否全零， 如果不是全零， 则按照 802.16d协议中规定的流程作下一步 处理；
其中， CID为 802.16d协议中定义的链路标识， 根据协议规定， 全 零的 CID用于测距过程中的消息传递；
3、 如果 CID是全零， 根据 SS的 MAC地址判断 SS是否应该接入 到该 BS,如果 SS不应该接入该 BS,则发送终止测距响应 RNG-RSP abort 给 SS, 终止和该 SS的测距过程；
4、 如果允许该 SS接入 BS, 则进一步按 802.16d协议判断是否将
SS转移到另外的信道处理， 如果不需要， 则按 802.16d协议继续下一步 处理；
5、 如果需要将 SS转移到另外的信道处理， 则发送 RNG-RSP abort 给 SS， 终止当前初始化测距过程。
在上述 BS的初始测距过程中， BS在收到 RNG-REQ后增加了对 SS 归属判断， 如果 BS中没有配置该 SS的参数， 说明 SS不应该接入当前 的 BS, 则在发给 SS的测距响应 RNG-RSP中要求 SS中断和该 BS的测 距过程，按照 802.16d协议定义的流程重新选择新的信道进行测距过程， 直到接入正确的 BS。
如图 4为本发明优选实施例给出的， SS的接入过程示意图。 本实施 例以只有两个基站 BS1和 BS2覆盖交叠为例进行说明， 需要说明的是， 上述方法在有两个以上的 BS覆盖交叠区域的情况下同样适用。 在初始 化测距过程中确定是否允许 SS接入当前 BS， 如果不允许， 就中断测距 流程， 让 SS搜寻其他信道， 接入其他 BS。 步骤如下：
1、 在初始化测距过程中， SS首先扫描到基站 BS1的信号， 并启动 测距过程；
2、 所述 SS发送 RNG-REQ到 BS1 , 然后等待 BS1回复 RNG-RSP; 3、 BS1 居自身的 SS配置信息表， 检查该 SS是否在自身的 SS配 置信息表中；
4、若该 SS不在 BS1的 SS配置信息表中，则 BS1发送 RNG-RSP Abort 给 SS;
5、 所述 SS接收到 RNG-RSP Abort后， 中断自身和 BS 1的测距过 程， 转到下一个频点， 例如， BS2所在频点， 开始新的测距过程；
6、 所述 SS发送 R G-REQ到 BS2, 然后等待 BS2回复 RNG-RSP;
7、 BS2根据自身的 SS配置信息表， 检查该 SS是否在自身的 SS配 置信息表中；
8、若该 SS在 BS2自身的 SS配置信息表中，并且该 SS已通过 BS2 测距过程的所有检查， 则 BS2发送测距成功响应 RNG-RSP Success给 SS;
9、所述 SS接收到 RNG-RSP Success后，接入 BS2,继续按照 802.16d 标准规定进行初始化过程的下一步流程。
根据协议规定， 初始化过程是一个很长的过程， 测距只是其中的一 步而已。
从上述接入过程可以看出， 为了实现多 BS环境下 SS的接入， 还需 要对现有 BS进行改进，图 5显示了本发明优选实施例给出的 BS的内部 结构， 从图 5可以看出， BS中除了配合 SS完成测距过程的测距模块之 外， 还进一步包括一个连接到所述测距模块的 SS认证模块， 用于保存 SS配置信息表，在通过测距模块收到来自 SS的测距请求后， 判断该 SS 是否归属于本 BS, 并在判断得到 SS不归属于本 BS时， 控制所述测距 模块发送终止测距响应到所述 SS。
由此可以看出， 上述本发明的优选实施例采用了控制流程将 BS对 SS的接入认证流程和测距流程相接合， 使得 SS在接入 BS之间， 首先 需要进行认证， 当 SS不归属于该 BS时， 退出测距流程， 重新选择新的 信道进行测距， 直到接入正确的 BS， 从而解决了当 SS位于两个 BS交 叠覆盖区域时的接入问题。 本领域的技术人员可以理解， 上述方法仅需 对 BS的测距流程进行修改， SS的测距流程完全按协议中规定的流程处 理， 不需要任何额外的修改， 非常方便实用。
本领域技术人员不脱离本发明的实质和精神， 可以有多种变形方案 实现本发明， 以上所述仅为本发明较佳可行的实施例而已， 并非因此局 限本发明的权利范围， 凡运用本发明说明书及附图内容所作的等效变 化， 均包含于本发明的权利范围之内。

Claims

权利要求书
1、 多基站环境下用户站 SS接入基站 BS的方法， 其特征在于， 包 括：
SS扫描到某一 BS的信号后， 启动测距过程， 向所述 BS发送测距 请求；
该 BS检查所述 SS是否归属于本 BS， 若不归属于本 BS, 则发送终 止测距响应给所述 SS;
所述 SS收到终止测距响应后， 中断和所述 BS的测距过程， 重新选 择新的信道进行测距， 直到接入正确的 BS。
2、根据权利要求 1所述的多基站环境下用户站接入基站的方法，其 特征在于， 进一步包括：
若所述 BS检查所述 SS归属于本 BS, 并且该 SS通过所述 BS测距 过程的所有检查， 则所述 BS发送测距成功响应给所述 SS， 所述 SS接 入所述 BS。
3、根据权利要求 2所述的多基站环境下用户站接入基站的方法，其 特征在于， 在所述 BS检查得到所述 SS归属于本 BS后， 进一步包括： 所述 BS进一步判断是否需要将 SS转移到另外的信道处理，如果需 要， 则发送终止测距响应给所述 SS; 否则， 进一步检查该 SS是否通过 所述 BS过程的所有检查。
4、根据权利要求 1或 2所述的多基站环境下用户站接入基站的方法， 其特征在于， 所述 BS检查所述 SS是否归属于本 BS的步骤包括：
所述 BS根据自身的 SS配置信息表，检查所述 SS是否在自身的 SS 配置信息表中， 若不在自身的 SS配置信息表中， 则该 SS不归属于所述 BS; 若在自身的 SS配置信息表中， 则所述 SS归属于所述 BS。
5、根据权利要求 3所述的多基站环境下用户站接入基站的方法，其 特征在于，在所述 BS检查所述 SS是否归属于本 BS之前，进一步包括： 所述 BS接收来自 SS的测距请求报文；
所述 BS判断测距请求报文承载的链路标识是否全零， 如果所述链 路标识全零，则执行检查所述 BS检查所述 SS是否归属于本 BS的步職。
6、根据权利要求 3所述的多基站环境下用户站接入基站的方法，其 特征在于， 所述 SS配置信息表中保存归属于本 BS的所有 SS的媒体访 问控制 MAC地址；
所述检查所述 SS是否在自身的 SS配置信息表中的步骤包括： 所述 BS才艮据 SS的 MAC地址判断所述 SS是否在 BS的用户站配置信息表中。
7、 一种基站 BS, 其特征在于， 包括：
测距模块， 用于配合用户站 SS完成测距功能；
SS认证模块， 连接到所述测距模块， 用于保存自身的 SS配置信息 表， 在通过测距模块收到来自 SS的测距请求后， 判断该 SS是否归属于 本 BS, 并在判断得到 SS不归属于本 BS时， 控制所述测距模块发送终 止测距响应到所述 SS。
PCT/CN2006/002641 2005-10-19 2006-10-09 Procede d’acces d’une station de base par une station d’abonne sous la condition de multiples stations de base WO2007045152A1 (fr)

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