WO2009067890A1 - Method for receiving or transmitting assistant carrier frequency switching information and device thereof - Google Patents

Method for receiving or transmitting assistant carrier frequency switching information and device thereof Download PDF

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Publication number
WO2009067890A1
WO2009067890A1 PCT/CN2008/072957 CN2008072957W WO2009067890A1 WO 2009067890 A1 WO2009067890 A1 WO 2009067890A1 CN 2008072957 W CN2008072957 W CN 2008072957W WO 2009067890 A1 WO2009067890 A1 WO 2009067890A1
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WIPO (PCT)
Prior art keywords
mobile terminal
information
carrier frequency
redirection message
delay
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PCT/CN2008/072957
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French (fr)
Chinese (zh)
Inventor
Juejun Liu
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Huawei Technologies Co., Ltd.
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Publication of WO2009067890A1 publication Critical patent/WO2009067890A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0009—Control or signalling for completing the hand-off for a plurality of users or terminals, e.g. group communication or moving wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment

Definitions

  • the invention belongs to the field of wireless communication technologies, and in particular relates to a method and a device for transmitting and receiving auxiliary carrier frequency switching information.
  • a network redirection function is provided.
  • the base station BS may provide other carrier frequencies or the network may provide If the service is better, or the current network load is heavy, the base station BS can re-rect the mobile terminal MS to other carrier frequencies or networks by carrying the destination carrier frequency or network identifier in the responding RNG-RSP message. go with.
  • the base station BS currently 16e only provides this kind of peer-to-peer network redirection function, that is, each time the base station BS can only redirect one mobile terminal MS that is being accessed, in some other scenarios, such as when the network has some conditions, such as a network.
  • the system cannot notify a mobile terminal MS or a group of mobile terminals MS or all mobile terminals MS currently serving by transferring a point-to-multipoint network redirection message. On other system carrier frequencies or networks, it affects the normal communication of the mobile terminal MS.
  • the inventors have found that at least the following problems exist in the prior art solutions: In the current ultra mobile broadband UMB, when the base station BS transfers a group of mobile terminals MS or all mobile terminals MS to other carrier frequencies or networks, Because the base station BS can provide multiple transfer target carrier frequencies or networks, but the selection is still the mobile terminal MS's own choice, and the mobile terminal MS does not know the load of these target carrier frequencies, etc., which may cause a large number of mobile terminal MSs. If you choose to go to the same target carrier frequency or network, if these mobile terminals MS decide to transfer to other carrier frequencies or networks at the same time, they will also cause instantaneous load impact on these carrier frequencies or networks.
  • the embodiment of the present invention particularly provides a method and an apparatus for transmitting and receiving auxiliary carrier frequency switching information.
  • the method of the embodiment of the invention includes:
  • a method for transmitting auxiliary carrier frequency switching information sending a network redirection message to a mobile terminal, where the network redirection message carries load information or delay information, where the load information or delay information is used to assist a mobile terminal to perform carrier frequency switching.
  • a method for receiving a carrier frequency switching information the mobile terminal receiving a network redirection message, where the network redirection message carries load information or delay information, where the load information or delay information is used to assist the mobile terminal to perform carrier frequency switching.
  • a generating module configured to generate a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
  • the sending module is configured to send the network redirection message to the mobile terminal.
  • a receiving module configured to receive a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
  • Read module Used to read the load information or delay information carried in the network redirect message.
  • the method and apparatus for network redirection according to the embodiment of the present invention can reduce the load impact of a large number of mobile terminals on the same target carrier frequency or network instantaneously when a large number of mobile terminals need to be redirected.
  • FIG. 1 is a schematic diagram of a base station according to an embodiment of the present invention
  • 2 is a flow chart of steps of a method according to Embodiment 1 of the present invention
  • Figure 3 is a flow chart showing the steps of the method of the present invention.
  • FIG. 4 is a schematic diagram of a base station apparatus and a mobile terminal apparatus according to an embodiment of the present invention.
  • the carrier frequency fl needs network maintenance, and the base station stops performing wireless access service on the carrier frequency fl.
  • Step 11 the base station actively assembles the network redirection message, and carries the network redirection destination network identifiers f2, f3, and f4, and sets the transition probabilities p2, p3, and p4 according to the load information of the carrier frequency f2, the carrier frequency f3, and the carrier frequency f4, respectively. And then broadcast the network redirection message on the carrier fl;
  • Step 12 All mobile terminals that are receiving the carrier frequency fl receive the network redirection message sent by the base station;
  • Step 13 a mobile terminal reads the transition probability in the network redirection message first resolves to the destination redirection network f2 and the transition probability p2;
  • Step 14 the mobile terminal randomly generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will redirect to f2, otherwise
  • Step 15 the mobile terminal acquires the transition probability p3 of the carrier frequency f3, and randomly generates a random number and compares it with p3. If it is greater than p3, the mobile terminal will redirect to the carrier frequency f3, otherwise
  • Step 16 The mobile terminal transfers to the carrier frequency f4.
  • Example 2 Referring to FIG. 1 and FIG. 3, in a WiMAX system based on multi-carrier mode, there are four carrier configurations fl, f 2, f 3, and f4 in the coverage area of the base station. At a certain time, the carrier frequency fl needs to perform network maintenance, and the base station stops performing wireless access service on the carrier frequency fl. Includes the following steps:
  • Step 21 The base station actively assembles a network redirection message, and respectively broadcasts a delay information value range preset by the carrier frequency f2, the carrier frequency f3, and the carrier frequency f4 by using a network redirection message to broadcast on the carrier frequency fl; Step 22, receiving After receiving the network redirection message sent by the base station, all the mobile terminals served by the frequency fl read the delay information in the network redirection message;
  • Step 13 The mobile terminal A is a high-priority user, and selects a value from the delayed information in the read network redirection message as its own delay waiting time, for example, 2 frames. Then, after waiting for 2 frames, the mobile terminal A switches to the destination carrier frequency and continues communication.
  • Step 24 The mobile terminal B is a low-priority user. Since the base station presets delay information of different priorities, the delay information in the network redirection message read by the mobile terminal B may be too large, for example, 4 frames. . Then, after waiting for 4 frames, the mobile terminal B switches to the destination carrier frequency and continues to communicate.
  • the base station since the base station pre-sets the QoS priority of the mobile terminal, the high priority user first performs handover.
  • Implementation 1 and Implementation 2 are applicable to the network that needs to be maintained.
  • a large number of users have access to the network.
  • the base station After the base station sends a network redirection message, it can quickly switch a large number of users to other carrier frequencies to continue communication.
  • By setting different priorities of different mobile terminals it is ensured that multiple mobile terminals can switch in order to the same destination carrier frequency at the same time, avoiding the reverse access signal or ranging channel of the destination carrier frequency.
  • Instant load shocks reduce network congestion.
  • the base station may carry network redirection information (eg, in a DCD message) in the system parameter message in the WiMAX system.
  • network redirection information eg, in a DCD message
  • the mobile terminal receiving the service transfers to the carrier frequency f 2 or the carrier frequency f 3 Receive service. Includes the following steps:
  • Step 31 The base station carries the network redirection information in the broadcast system parameter message, first indicating that the network carrier frequency fl is temporarily in the maintenance state, is unavailable, and the mobile terminal may transfer to the destination network carrier frequency f2 or the destination network carrier frequency f3, and Carrying the probability of shifting to the carrier frequency f2;
  • Step 32 Each mobile terminal that captures the network carrier frequency fl, after the mobile terminal receives the system parameter message on the carrier frequency fl, and finds that the carrier frequency fl is unavailable, the mobile terminal parses the destination network carrier frequency f 2 and Its transfer probability;
  • Step 33 The mobile terminal generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will transfer to the carrier frequency f2, otherwise the mobile terminal transfers to the carrier frequency ⁇ .
  • different priorities of different mobile terminals are set, and different transition probabilities are set according to different priorities, so that multiple mobile terminals can be switched in an orderly manner when switching to the same destination carrier frequency at the same time, avoiding the destination
  • the frequency of the reverse access signal or the ranging channel causes a large instantaneous load shock, which reduces the occurrence of network congestion.
  • the base station BS may carry network redirection information (e.g., in a DCD message) in the system parameter message in the WiMAX system.
  • network redirection information e.g., in a DCD message
  • the mobile terminal receiving the service transfers to the carrier frequency f 2 or the carrier frequency f 3 to receive the service, including the following steps:
  • Step 41 The base station carries the network redirection information in the broadcasted system parameter message, first indicating that the network carrier frequency fl is temporarily in the maintenance state, is unavailable, and the mobile terminal may transfer to the destination network carrier frequency f2 or the destination network carrier frequency f3, and Carrying a delay information value range m2 of the access carrier frequency f2;
  • Step 42 Each mobile terminal that captures the network carrier frequency fl, after the mobile terminal receives the system parameter message on the carrier frequency fl, and finds that the carrier frequency fl is unavailable, the mobile terminal parses the destination network carrier frequency f2 and Delay information value range m2;
  • Step 43 The mobile terminal randomly selects a value from the delay information value range m2 as its own cut.
  • the delay time is 3 frames
  • the mobile terminal MS switches to the carrier frequency f2 for communication after waiting for 3 frames.
  • different priorities of different mobile terminals are set, and different delay values are set to ensure that multiple mobile terminals can switch in order to switch to the same destination carrier frequency at the same time, thereby avoiding reverse of the target carrier frequency.
  • the access signal or the ranging channel causes a large instantaneous load shock, which reduces the occurrence of network congestion.
  • the current serving carrier frequency of the base station is not supported for the service that the mobile terminal needs to acquire, and the mobile terminal is redirected to another network carrier frequency f2 or carrier frequency f3 supporting the service. Including the following steps:
  • Step 51 The base station presets the transfer probabilities p2 and p3 in the network redirection message of the carrier frequency f2 and the carrier frequency f3, and sends the transition probabilities p2 and p3 in the network redirection message to the mobile terminal by using a broadcast manner;
  • Step 52 The mobile terminal receives a network redirection message and parses the destination network carrier frequency f2 and its transition probability;
  • Step 53 The mobile terminal generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will transfer to the carrier frequency f2, otherwise the mobile terminal transfers to the carrier frequency ⁇ .
  • the base station current serving carrier frequency fl stops for a certain multicast connection, and redirects all mobile terminals that are receiving the multicast service to another network carrier frequency f2 or carrier frequency f3 that provides the multicast connection service.
  • Step 61 The base station presets the delay information ranges m2 and m3 in the network redirection message of the carrier frequency f2 and the carrier frequency f3, and sends the transition probabilities m2 and m3 in the network redirection message to the mobile terminal by using a broadcast manner;
  • Step 62 the mobile terminal receives the network redirection message and parses the destination network carrier frequency f3 and its delay information value range m3;
  • Step 63 The mobile terminal randomly selects a value from the delay information value range m3 as the delay time for switching to the carrier frequency f3, for example, the delay time is 1 frame, and the mobile terminal switches to the carrier frequency after waiting for 1 frame. f 3 communicates.
  • Embodiment 5 and Embodiment 6 By setting the transition probability and the delay value, the number of mobile terminals allowed to be accessed by the control target carrier frequency can be achieved, thereby avoiding a large instantaneous load impact and network congestion.
  • the embodiment of the present invention further provides an apparatus involved in the method of the present invention, comprising a base station 301 and a mobile terminal 302, see FIG. 4:
  • the base station includes:
  • a generating module configured to generate a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
  • the sending module is configured to send the network redirection message to the mobile terminal.
  • the mobile terminal includes:
  • the receiving module 3021 is configured to receive a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
  • the reading module 3022 is configured to: read load information or delay information carried in the network redirection message, or read a further transfer probability or delay value in the network redirection message;
  • the searching module 3023 is configured to search, from the mapping table, a transition probability corresponding to the load information, or a delay value corresponding to the delay information;
  • the operation module 3024 randomly generates a number between 0 and 1 to compare with the transition probability in the network redirection message, selects whether to perform carrier frequency switching, or selects carrier frequency switching according to the delay value.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

A method for receiving and transmitting assistant carrier frequency switching information includes: transmitting network redirection message to mobile terminals; the mobile terminals which need to carry out network redirection receive the network redirection message, after the analyzing operation, selecting the carrier frequency to carry out switching. A device for receiving and transmitting assistant carrier frequency switching information includes a base station and a mobile terminal, wherein the base station includes: a memory module, a transmission module; the mobile terminal includes: a receiving module, a reading module, an operation module.

Description

一种收发辅佐载频切换信息的方法及装置 技术领域  Method and device for transmitting and receiving auxiliary carrier frequency switching information
本发明属于无线通讯技术领域， 特别涉及一种收发辅佐载频切换信息的 方法及装置。  The invention belongs to the field of wireless communication technologies, and in particular relates to a method and a device for transmitting and receiving auxiliary carrier frequency switching information.
背景技术 Background technique
目前的 WiMAX***中， 提供一种网络重定向的功能， 比如移动终端 MS在初 始 rang ing时， 向当前接入基站 BS发送 RNG - REQ后， 如果基站 BS发现有其他的 载频或者网络可以提供更好的服务， 或者自己当前网络负载较重， 那么基站 BS可以通过在响应的 RNG-RSP消息中携带目的载频或者网络标识， 将移动终端 MS重定向（redi rect)到其他载频或网络去。 但是目前 16e仅提供这一种点对点 的网络重定向功能， 即每次基站 BS只能将一个正在接入的移动终端 MS重定向， 在一些其他的场景中， 比如当网络发生一些状况， 例如网络需要维护， 网络 计费出现问题， 网络不能提供业务等原因， ***无法通过发送点对多点的网 络重定向消息， 通知一个移动终端 MS或者一群移动终端 MS或者当前服务的所 有移动终端 MS转移到其他***载频或网络上， 影响移动终端 MS的正常通讯。  In the current WiMAX system, a network redirection function is provided. For example, when the mobile terminal MS transmits RNG-REQ to the current access base station BS, the base station BS may provide other carrier frequencies or the network may provide If the service is better, or the current network load is heavy, the base station BS can re-rect the mobile terminal MS to other carrier frequencies or networks by carrying the destination carrier frequency or network identifier in the responding RNG-RSP message. go with. However, currently 16e only provides this kind of peer-to-peer network redirection function, that is, each time the base station BS can only redirect one mobile terminal MS that is being accessed, in some other scenarios, such as when the network has some conditions, such as a network. Maintenance, network billing problems, network failure to provide services, etc. The system cannot notify a mobile terminal MS or a group of mobile terminals MS or all mobile terminals MS currently serving by transferring a point-to-multipoint network redirection message. On other system carrier frequencies or networks, it affects the normal communication of the mobile terminal MS.
在实际应用中， 发明人发现现有技术的方案中至少存在以下问题： 目前 的超移动宽带 UMB中， 对于基站 BS是将一群移动终端 MS或者所有的移动终 端 MS转移到其他载频或者网络时， 因为基站 BS虽然可以提供多个转移目标 载频或者网络， 但是选择仍然是移动终端 MS 自己选择， 而移动终端 MS又不 知道这些目标载频的负荷等消息， 就有可能造成大量移动终端 MS选择到同一 目标载频或网络，此时这些移动终端 MS如果同时决定转移到其他载频或者网 络， 同样会对这些载频或者网络造成瞬间的负荷冲击。  In practical applications, the inventors have found that at least the following problems exist in the prior art solutions: In the current ultra mobile broadband UMB, when the base station BS transfers a group of mobile terminals MS or all mobile terminals MS to other carrier frequencies or networks, Because the base station BS can provide multiple transfer target carrier frequencies or networks, but the selection is still the mobile terminal MS's own choice, and the mobile terminal MS does not know the load of these target carrier frequencies, etc., which may cause a large number of mobile terminal MSs. If you choose to go to the same target carrier frequency or network, if these mobile terminals MS decide to transfer to other carrier frequencies or networks at the same time, they will also cause instantaneous load impact on these carrier frequencies or networks.
发明内容 Summary of the invention
本发明实施例为了解决现有技术中的不足， 特别提供了一种收发辅佐载 频切换信息的方法及装置。 本发明实施例的方法包括： In order to solve the deficiencies in the prior art, the embodiment of the present invention particularly provides a method and an apparatus for transmitting and receiving auxiliary carrier frequency switching information. The method of the embodiment of the invention includes:
一种发送辅佐载频切换信息的方法， 向移动终端发送网络重定向消息， 所述的网络重定向消息携带负载信息或延迟信息， 所述负载信息或延迟信息 用于辅佐移动终端进行载频切换。  A method for transmitting auxiliary carrier frequency switching information, sending a network redirection message to a mobile terminal, where the network redirection message carries load information or delay information, where the load information or delay information is used to assist a mobile terminal to perform carrier frequency switching. .
一种接收辅佐载频切换信息的方法， 移动终端接收网络重定向消息， 所 述的网络重定向消息携带负载信息或延迟信息， 所述负载信息或延迟信息用 于辅佐移动终端进行载频切换。  A method for receiving a carrier frequency switching information, the mobile terminal receiving a network redirection message, where the network redirection message carries load information or delay information, where the load information or delay information is used to assist the mobile terminal to perform carrier frequency switching.
本发明实施例的基站包括：  The base station of the embodiment of the present invention includes:
生成模块： 用于生成网络重定向消息， 所述网络重定向消息携带负载信 息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述延迟 信息对应的延迟值；  a generating module, configured to generate a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
发送模块： 用于向移动终端发送所述网络重定向消息。  The sending module is configured to send the network redirection message to the mobile terminal.
本发明实施例的移动终端包括：  The mobile terminal of the embodiment of the present invention includes:
接收模块： 用于接收网络重定向消息， 所述网络重定向消息携带负载信 息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述延迟 信息对应的延迟值；  a receiving module, configured to receive a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
读取模块： 用于读取网络重定向消息中携带的负载信息或延迟信息。 釆用本发明实施例网络重定向的方法及装置， 在大量移动终端需要重定 向时， 可以减少大量移动终端选择到同一目标载频或网络瞬间对***的负荷 冲击。  Read module: Used to read the load information or delay information carried in the network redirect message. The method and apparatus for network redirection according to the embodiment of the present invention can reduce the load impact of a large number of mobile terminals on the same target carrier frequency or network instantaneously when a large number of mobile terminals need to be redirected.
附图说明 DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。  In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.
图 1为本发明实施例的基站示意图； 图 2为本发明实施例 1的方法步骤流程图； 1 is a schematic diagram of a base station according to an embodiment of the present invention; 2 is a flow chart of steps of a method according to Embodiment 1 of the present invention;
图 3为本发明方法的步骤流程图；  Figure 3 is a flow chart showing the steps of the method of the present invention;
图 4为本发明实施例的基站装置与移动终端装置的示意图。  FIG. 4 is a schematic diagram of a base station apparatus and a mobile terminal apparatus according to an embodiment of the present invention.
具体实施方式 detailed description
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例 , 都属于本发明保护的范围。  The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
实施例 1  Example 1
参照图 1、 图 2, 基于多载波模式的 WiMAX***中， 基站覆盖区域内存在 4载波配置 fl、 f2、 f3、 f4。 某时刻载频 fl需要进行网络维护， 基站停止在 载频 fl上进行无线接入服务。 包括以下步骤：  Referring to FIG. 1 and FIG. 2, in a WiMAX system based on multi-carrier mode, there are four carrier configurations fl, f2, f3, and f4 in the coverage area of the base station. At a certain time, the carrier frequency fl needs network maintenance, and the base station stops performing wireless access service on the carrier frequency fl. Includes the following steps:
步骤 11, 基站主动组装网络重定向消息， 并携带网络重定向的目的网络 标识 f2、 f3和 f4, 分别根据载频 f2、 载频 f3和载频 f4的负载信息设置转 移概率 p2、 p3和 p4, 然后将网络重定向消息在载波 fl上广播；  Step 11, the base station actively assembles the network redirection message, and carries the network redirection destination network identifiers f2, f3, and f4, and sets the transition probabilities p2, p3, and p4 according to the load information of the carrier frequency f2, the carrier frequency f3, and the carrier frequency f4, respectively. And then broadcast the network redirection message on the carrier fl;
步骤 12,正在接收载频 fl服务的所有移动终端接收基站发送的网络重定 向消息；  Step 12: All mobile terminals that are receiving the carrier frequency fl receive the network redirection message sent by the base station;
步骤 13, 某一个移动终端读取网络重定向消息中的转移概率首先解析到 目的重定向网络 f2及转移概率 p2;  Step 13, a mobile terminal reads the transition probability in the network redirection message first resolves to the destination redirection network f2 and the transition probability p2;
步骤 14, 所述移动终端随机产生一个随机数并与 p2比较， 如果大于 p2, 则移动终端将重定向到 f2, 否则  Step 14, the mobile terminal randomly generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will redirect to f2, otherwise
步骤 15, 所述移动终端获取载频 f3的转移概率 p3, 并随机产生随机数 并与 p3比较， 如果大于 p3, 则移动终端将重定向到载频 f 3, 否则  Step 15, the mobile terminal acquires the transition probability p3 of the carrier frequency f3, and randomly generates a random number and compares it with p3. If it is greater than p3, the mobile terminal will redirect to the carrier frequency f3, otherwise
步骤 16, 所述移动终端转移到载频 f4。  Step 16. The mobile terminal transfers to the carrier frequency f4.
移动终端决定转移到选定的目的载频后， 将断开与原来的网络服务。 实施例 2 参照图 1、 图 3 , 基于多载波模式的 WiMAX***中， 基站覆盖区域内存在 4载波配置 f l、 f 2、 f 3、 f4。 某时刻载频 f l需要进行网络维护， 基站停止在 载频 f l上进行无线接入服务。 包括以下步骤： After the mobile terminal decides to transfer to the selected destination carrier frequency, it will disconnect from the original network service. Example 2 Referring to FIG. 1 and FIG. 3, in a WiMAX system based on multi-carrier mode, there are four carrier configurations fl, f 2, f 3, and f4 in the coverage area of the base station. At a certain time, the carrier frequency fl needs to perform network maintenance, and the base station stops performing wireless access service on the carrier frequency fl. Includes the following steps:
步骤 21 , 基站主动组装网络重定向消息， 分别将载频 f2、 载频 f 3和载 频 f4预先设置的延迟信息值范围通过网络重定向消息在载频 f l下广播； 步骤 22 ,正在接收载频 f l服务的所有移动终端接收到基站发送的网络重 定向消息后， 读取网络重定向消息中的延迟信息；  Step 21: The base station actively assembles a network redirection message, and respectively broadcasts a delay information value range preset by the carrier frequency f2, the carrier frequency f3, and the carrier frequency f4 by using a network redirection message to broadcast on the carrier frequency fl; Step 22, receiving After receiving the network redirection message sent by the base station, all the mobile terminals served by the frequency fl read the delay information in the network redirection message;
步骤 13 , 移动终端 A为高优先级用户， 从读取到的网络重定向消息中的 延迟信息中随即选取一个值作为自己的延迟等待时间， 例如为 2帧。 则该移 动终端 A在等待 2帧后， 切换到目的载频， 继续进行通讯。  Step 13: The mobile terminal A is a high-priority user, and selects a value from the delayed information in the read network redirection message as its own delay waiting time, for example, 2 frames. Then, after waiting for 2 frames, the mobile terminal A switches to the destination carrier frequency and continues communication.
步骤 24 , 移动终端 B为低优先级用户， 由于基站预先设定了不同优先级 的延迟信息， 则移动终端 B从读取到的网络重定向消息中的延迟信息会偏大， 例如为 4帧。 则该移动终端 B在等待 4帧后， 切换到目的载频， 继续进行通 讯。  Step 24: The mobile terminal B is a low-priority user. Since the base station presets delay information of different priorities, the delay information in the network redirection message read by the mobile terminal B may be too large, for example, 4 frames. . Then, after waiting for 4 frames, the mobile terminal B switches to the destination carrier frequency and continues to communicate.
在同种情况下， 由于基站对于移动终端 QoS优先级进行了预先设定， 高 优先级用户先进行切换。  In the same case, since the base station pre-sets the QoS priority of the mobile terminal, the high priority user first performs handover.
实施 1和实施 2适用于当前需要维护的网络已经有大量用户接入， 经过 基站发送网络重定向消息， 可迅速将大量用户切换到其他载频下继续进行通 讯。 通过设置不同移动终端的不同优先级， 保证了多个移动终端同时切换到 同一个目的载频时能够有序的切换， 避免对目的载频的反向接入信号或者测 距信道造成很大的瞬间负荷冲击， 减少了网络拥挤的发生。  Implementation 1 and Implementation 2 are applicable to the network that needs to be maintained. A large number of users have access to the network. After the base station sends a network redirection message, it can quickly switch a large number of users to other carrier frequencies to continue communication. By setting different priorities of different mobile terminals, it is ensured that multiple mobile terminals can switch in order to the same destination carrier frequency at the same time, avoiding the reverse access signal or ranging channel of the destination carrier frequency. Instant load shocks reduce network congestion.
实施例 3  Example 3
基站在 WiMAX ***中， 可以在***参数消息中携带网络重定向信息 （例 如在 DCD消息中）。 某时刻， 基站覆盖的区域存在 3载波配置 f l、 f 2、 f 3 , 由 于载频 f l对应的计费***出现问题， 载频 f l将不提供无线接入服务， 运营 商希望所有本应该在 f 1上接收服务的移动终端转移到载频 f 2或者载频 f 3上 接收服务。 包括以下步骤： The base station may carry network redirection information (eg, in a DCD message) in the system parameter message in the WiMAX system. At a certain moment, there are 3 carrier configurations fl, f 2, and f 3 in the area covered by the base station. Due to the problem of the charging system corresponding to the carrier frequency fl, the carrier frequency fl will not provide the wireless access service, and the operator hopes that all should be in the f. 1 The mobile terminal receiving the service transfers to the carrier frequency f 2 or the carrier frequency f 3 Receive service. Includes the following steps:
步骤 31 , 基站在广播的***参数消息中携带网络重定向信息， 首先指示 网络载频 fl暂时处于维护状态， 不可用， 移动终端可以转移到目的网络载频 f2或者目的网络载频 f 3 , 并且携带转移到载频 f2的概率；  Step 31: The base station carries the network redirection information in the broadcast system parameter message, first indicating that the network carrier frequency fl is temporarily in the maintenance state, is unavailable, and the mobile terminal may transfer to the destination network carrier frequency f2 or the destination network carrier frequency f3, and Carrying the probability of shifting to the carrier frequency f2;
步骤 32 ,每个捕获到网络载频 fl的移动终端， 当所述移动终端接收到载 频 fl上的***参数消息后， 发现载频 fl不可用， 则移动终端解析目的网络 载频 f 2及其转移概率；  Step 32: Each mobile terminal that captures the network carrier frequency fl, after the mobile terminal receives the system parameter message on the carrier frequency fl, and finds that the carrier frequency fl is unavailable, the mobile terminal parses the destination network carrier frequency f 2 and Its transfer probability;
步骤 33, 所述移动终端产生随机数并与 p2比较， 如果大于 p2 , 则移动 终端将转移到载频 f2 , 否则移动终端转移到载频 Π。  Step 33: The mobile terminal generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will transfer to the carrier frequency f2, otherwise the mobile terminal transfers to the carrier frequency Π.
本实施例通过设置不同移动终端的不同优先级， 进而根据不同的优先级 设置不同的转移概率， 保证了多个移动终端同时切换到同一个目的载频时能 够有序的切换， 避免对目的载频的反向接入信号或者测距信道造成很大的瞬 间负荷冲击， 减少了网络拥挤的发生。  In this embodiment, different priorities of different mobile terminals are set, and different transition probabilities are set according to different priorities, so that multiple mobile terminals can be switched in an orderly manner when switching to the same destination carrier frequency at the same time, avoiding the destination The frequency of the reverse access signal or the ranging channel causes a large instantaneous load shock, which reduces the occurrence of network congestion.
实施例 4  Example 4
基站 BS在 WiMAX***中，可以在***参数消息中携带网络重定向信息（例 如在 DCD消息中）。 某时刻， 基站覆盖的区域存在 3载波配置 fl、 f2、 f 3 , 由 于载频 fl对应的计费***出现问题， 载频 fl将不提供无线接入服务， 运营 商希望所有本应该在 f 1上接收服务的移动终端转移到载频 f 2或者载频 f 3上 接收服务， 包括以下步骤：  The base station BS may carry network redirection information (e.g., in a DCD message) in the system parameter message in the WiMAX system. At a certain moment, there are 3 carrier configurations fl, f2, and f3 in the area covered by the base station. Since the charging system corresponding to the carrier frequency fl has a problem, the carrier frequency fl will not provide the wireless access service, and the operator hopes that all should be in the f 1 The mobile terminal receiving the service transfers to the carrier frequency f 2 or the carrier frequency f 3 to receive the service, including the following steps:
步骤 41 , 基站在广播的***参数消息中携带网络重定向信息， 首先指示 网络载频 fl暂时处于维护状态， 不可用， 移动终端可以转移到目的网络载频 f2或者目的网络载频 f 3 , 并且携带接入载频 f2的延迟信息值范围 m2;  Step 41: The base station carries the network redirection information in the broadcasted system parameter message, first indicating that the network carrier frequency fl is temporarily in the maintenance state, is unavailable, and the mobile terminal may transfer to the destination network carrier frequency f2 or the destination network carrier frequency f3, and Carrying a delay information value range m2 of the access carrier frequency f2;
步骤 42 ,每个捕获到网络载频 fl的移动终端， 当所述移动终端接收到载 频 fl上的***参数消息后， 发现载频 fl不可用， 则移动终端解析目的网络 载频 f2及其延迟信息值范围 m2;  Step 42: Each mobile terminal that captures the network carrier frequency fl, after the mobile terminal receives the system parameter message on the carrier frequency fl, and finds that the carrier frequency fl is unavailable, the mobile terminal parses the destination network carrier frequency f2 and Delay information value range m2;
步骤 43,所述移动终端随机从延迟信息值范围 m2选取一个值作为自己切 换至载频 f2的延迟时间， 例如延迟时间为 3帧， 则该移动终端 MS在等待 3 帧后， 切换至载频 f2进行通讯。 Step 43: The mobile terminal randomly selects a value from the delay information value range m2 as its own cut. When the delay time to the carrier frequency f2 is changed, for example, the delay time is 3 frames, the mobile terminal MS switches to the carrier frequency f2 for communication after waiting for 3 frames.
本实施例通过设置不同移动终端的不同优先级， 进而设置不同的延迟取 值， 保证了多个移动终端同时切换到同一个目的载频时能够有序的切换， 避 免对目的载频的反向接入信号或者测距信道造成很大的瞬间负荷冲击， 减少 了网络拥挤的发生。  In this embodiment, different priorities of different mobile terminals are set, and different delay values are set to ensure that multiple mobile terminals can switch in order to switch to the same destination carrier frequency at the same time, thereby avoiding reverse of the target carrier frequency. The access signal or the ranging channel causes a large instantaneous load shock, which reduces the occurrence of network congestion.
实施例 5  Example 5
基站当前服务载频 fl对于某个移动终端需要获取的业务不支持， 而将该 移动终端重定向到另一个支持该业务的网络载频 f2或者载频 f3。包括以下步 骤：  The current serving carrier frequency of the base station is not supported for the service that the mobile terminal needs to acquire, and the mobile terminal is redirected to another network carrier frequency f2 or carrier frequency f3 supporting the service. Including the following steps:
步骤 51, 基站预先设定载频 f2和载频 f3的网络重定向消息中的转移概 率 p2、 p3, 并通过广播方式， 将网络重定向消息中的转移概率 p2、 p3发送给 移动终端；  Step 51: The base station presets the transfer probabilities p2 and p3 in the network redirection message of the carrier frequency f2 and the carrier frequency f3, and sends the transition probabilities p2 and p3 in the network redirection message to the mobile terminal by using a broadcast manner;
步骤 52,所述移动终端接收网络重定向消息并解析目的网络载频 f2及其 转移概率；  Step 52: The mobile terminal receives a network redirection message and parses the destination network carrier frequency f2 and its transition probability;
步骤 53, 所述移动终端产生随机数并与 p2比较， 如果大于 p2, 则移动 终端将转移到载频 f2, 否则移动终端转移到载频 Π。  Step 53: The mobile terminal generates a random number and compares it with p2. If it is greater than p2, the mobile terminal will transfer to the carrier frequency f2, otherwise the mobile terminal transfers to the carrier frequency Π.
实施例 6  Example 6
某时刻， 基站当前服务载频 fl对于某种多播连接停止服务， 将所有正在 接收该多播业务的移动终端重定向到另一个提供该多播连接服务的网络载频 f2或者载频 f3。 包括以下步骤：  At some point, the base station current serving carrier frequency fl stops for a certain multicast connection, and redirects all mobile terminals that are receiving the multicast service to another network carrier frequency f2 or carrier frequency f3 that provides the multicast connection service. Includes the following steps:
步骤 61, 基站预先设定载频 f2和载频 f3的网络重定向消息中的延迟信 息范围 m2、 m3, 并通过广播方式， 将网络重定向消息中的转移概率 m2、 m3发 送给移动终端；  Step 61: The base station presets the delay information ranges m2 and m3 in the network redirection message of the carrier frequency f2 and the carrier frequency f3, and sends the transition probabilities m2 and m3 in the network redirection message to the mobile terminal by using a broadcast manner;
步骤 62,所述移动终端接收网络重定向消息并解析目的网络载频 f3及其 延迟信息值范围 m3; 步骤 63 ,所述移动终端随机从延迟信息值范围 m3选取一个值作为自己切 换至载频 f 3的延迟时间，例如延迟时间为 1帧，则该移动终端在等待 1帧后， 切换至载频 f 3进行通讯。 Step 62, the mobile terminal receives the network redirection message and parses the destination network carrier frequency f3 and its delay information value range m3; Step 63: The mobile terminal randomly selects a value from the delay information value range m3 as the delay time for switching to the carrier frequency f3, for example, the delay time is 1 frame, and the mobile terminal switches to the carrier frequency after waiting for 1 frame. f 3 communicates.
实施例 5和实施例 6通过设置转移概率和延迟取值， 达到控制目的载频 允许接入的移动终端的数量， 避免造成很大的瞬间负荷冲击和网络拥挤。 本发明实施例还提供了一种本发明的方法所涉及的装置， 包括一种基站 301和一种移动终端 302 , 参见图 4 :  Embodiment 5 and Embodiment 6 By setting the transition probability and the delay value, the number of mobile terminals allowed to be accessed by the control target carrier frequency can be achieved, thereby avoiding a large instantaneous load impact and network congestion. The embodiment of the present invention further provides an apparatus involved in the method of the present invention, comprising a base station 301 and a mobile terminal 302, see FIG. 4:
所述基站包括：  The base station includes:
生成模块： 用于生成网络重定向消息， 所述网络重定向消息携带负载信 息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述延迟 信息对应的延迟值；  a generating module, configured to generate a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
发送模块： 用于向移动终端发送所述网络重定向消息。  The sending module is configured to send the network redirection message to the mobile terminal.
所述移动终端包括：  The mobile terminal includes:
接收模块 3021 : 用于接收网络重定向消息， 所述网络重定向消息携带负 载信息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述 延迟信息对应的延迟值；  The receiving module 3021 is configured to receive a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
读取模块 3022:用于读取网络重定向消息中携带的负载信息或延迟信息， 或读取所述网络重定向消息中进一步携带的转移概率或延迟值；  The reading module 3022 is configured to: read load information or delay information carried in the network redirection message, or read a further transfer probability or delay value in the network redirection message;
查找模块 3023: 用于从映射表中查找与负载信息对应的转移概率， 或与 延迟信息对应的延迟值；  The searching module 3023 is configured to search, from the mapping table, a transition probability corresponding to the load information, or a delay value corresponding to the delay information;
运算模块 3024:在 0 ~ 1之间随机生成一个数字与网络重定向消息中的转 移概率进行比较选择是否进行载频切换， 或根据延迟值选择进行载频切换。  The operation module 3024: randomly generates a number between 0 and 1 to compare with the transition probability in the network redirection message, selects whether to perform carrier frequency switching, or selects carrier frequency switching according to the delay value.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程， 是可以通过计算机程序来指令相关的硬件来完成， 所述的程序可存储于 一计算机可读取存储介质中， 该程序在执行时， 可包括如上述各方法的实施 例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体（ Read-Only Memory, ROM )或随机存 己忆体 ( Random Access Memory, RAM )等。 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When implemented, may include implementation of the methods as described above The flow of the example. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
本发明在不脱离其精神和本质特征前提下， 可以有多种具体实施方式， 应当理解上述实施例并不限于上述的任何细节， 而应该在所附权利要求所定 义的精神和范围内被广泛地解释， 因此， 所有落在权利要求的边界和范围内 的或者与这些边界和范围等价的变化和修改都试图包含在附加权利要求内。  The present invention may be embodied in a variety of specific embodiments without departing from the spirit and scope of the invention. All changes and modifications that come within the scope and range of the claims are intended to be included in the appended claims.

Claims

权 利 要求 书 Claim
1、 一种发送辅佐载频切换信息的方法， 其特征在于， 向移动终端发送网络 重定向消息， 所述的网络重定向消息携带负载信息或延迟信息， 所述负载信息 或延迟信息用于辅佐移动终端进行载频切换。 A method for transmitting auxiliary carrier frequency switching information, which is characterized in that: a network redirection message is sent to a mobile terminal, where the network redirection message carries load information or delay information, and the load information or delay information is used to assist The mobile terminal performs carrier frequency switching.
2、 根据权利要求 1所述的方法， 其特征在于， 所述网络重定向消息可进一 步携带与所述负载信息对应的转移概率或与所述延迟信息对应的延迟值。  The method according to claim 1, wherein the network redirection message further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information.
3、 根据权利要求 2所述的方法， 其特征在于， 所述延迟值可根据移动终端 的型号为该终端选用与其它型号移动终端不同的数据单位。  The method according to claim 2, wherein the delay value is a data unit different from the other types of mobile terminals for the terminal according to the model of the mobile terminal.
4、 根据权利要求 1或 2所述的方法， 其特征在于， 在向移动终端发送网络 重定向消息之前， 所述负载信息、 转移概率、 延迟信息、 延迟值在基站进行预 先设定。  The method according to claim 1 or 2, wherein the load information, the transition probability, the delay information, and the delay value are pre-set at the base station before transmitting the network redirection message to the mobile terminal.
5、 根据权利要求 1所述的方法， 其特征在于， 在向移动终端发送网络重定 向消息之前， 所述方法进一步包括：  The method according to claim 1, wherein before the sending the network redirection message to the mobile terminal, the method further includes:
对移动终端的服务质量 QoS优先级预先进行设定， 以使得高优先级的移动 终端优先进行目标载频的切换。  The quality of service QoS priority of the mobile terminal is set in advance so that the high priority mobile terminal preferentially performs the switching of the target carrier frequency.
6、 一种接收辅佐载频切换信息的方法， 其特征在于， 移动终端接收网络重 定向消息， 所述的网络重定向消息携带负载信息或延迟信息， 所述负载信息或 延迟信息用于辅佐移动终端进行载频切换。  A method for receiving auxiliary carrier frequency switching information, wherein the mobile terminal receives a network redirection message, where the network redirection message carries load information or delay information, where the load information or delay information is used to assist mobile The terminal performs carrier frequency switching.
7、 根据权利要求 6所述的方法， 其特征在于， 所述网络重定向消息可进一 步携带与所述负载信息对应的转移概率或与所述延迟信息对应的延迟值。  The method according to claim 6, wherein the network redirection message further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information.
8、 根据权利要求 6所述的方法， 其特征在于， 所述方法进一步包括： 所述移动终端读取网络重定向消息中携带的负载信息或延迟信息并根据负 载信息或延迟信息查找相应的转移概率或延迟值， 或直接读取网络重定向消息 中携带的转移概率或延迟值。  The method according to claim 6, wherein the method further comprises: the mobile terminal reading the load information or the delay information carried in the network redirection message and searching for the corresponding transfer according to the load information or the delay information. Probability or delay value, or directly read the transition probability or delay value carried in the network redirect message.
9、 根据权利要求 8所述的方法， 其特征在于， 所述网络重定向消息中携带 的是负载信息或转移概率时， 移动终端在 0 ~ 1之间随机生成一个数字， 与所述 转移概率进行比较： The method according to claim 8, wherein when the network redirection message carries the load information or the transition probability, the mobile terminal randomly generates a number between 0 and 1, and the method Transfer probabilities are compared:
如果随机生成数字大于该转移概率， 则移动终端接入该转移概率针对的目 的载频；  If the randomly generated number is greater than the transition probability, the mobile terminal accesses the target carrier frequency for which the transition probability is directed;
否则， 移动终端继续扫描其他载频发送的网络重定向消息或等待下一时刻 继续监测同一载频发送的网络重定向消息。  Otherwise, the mobile terminal continues to scan for network redirection messages sent by other carrier frequencies or waits for the next time to continue to monitor network redirection messages sent by the same carrier frequency.
10、 根据权利要求 8所述的方法， 其特征在于， 所述网络重定向消息中携 带的是延迟信息或延迟值时， 移动终端根据所述延迟值进行载频切换。  The method according to claim 8, wherein when the network redirection message carries delay information or a delay value, the mobile terminal performs carrier frequency switching according to the delay value.
11、 根据权利要求 6所述的方法， 其特征在于， 所述方法进一步包括： 移动终端获取自身服务质量优先级信息， 所述移动终端根据所述负载信息 或转移概率结合所述移动终端自身服务质量优先级信息选择目标载频进行切 换。  The method according to claim 6, wherein the method further comprises: the mobile terminal acquiring its own quality of service priority information, the mobile terminal combining the mobile terminal's own service according to the load information or the transition probability The quality priority information selects the target carrier frequency to switch.
12、 一种基站， 其特征在于， 包括：  12. A base station, comprising:
生成模块（3011 ): 用于生成网络重定向消息， 所述网络重定向消息携带负 载信息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述延 迟信息对应的延迟值；  a generating module (3011): configured to generate a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
发送模块（3012 ): 用于向移动终端发送所述网络重定向消息。  The sending module (3012) is configured to send the network redirection message to the mobile terminal.
1 3、 一种移动终端， 其特征在于， 包括：  1 3, a mobile terminal, comprising:
接收模块（ 3021 ): 用于接收网络重定向消息， 所述网络重定向消息携带负 载信息或延迟信息， 或进一步携带与所述负载信息对应的转移概率或与所述延 迟信息对应的延迟值；  a receiving module (3021): configured to receive a network redirection message, where the network redirection message carries load information or delay information, or further carries a transition probability corresponding to the load information or a delay value corresponding to the delay information;
读取模块（ 3022 ):用于读取网络重定向消息中携带的负载信息或延迟信息。  The reading module (3022) is configured to read load information or delay information carried in the network redirection message.
14、 如权利要求 1 3所述的终端， 其特征在于， 所述读取模块还用于读取所 述网络重定向消息中进一步携带的转移概率或延迟值。 The terminal according to claim 13, wherein the reading module is further configured to read a transition probability or a delay value further carried in the network redirection message.
15、 如权利要求 1 3或 14所述的终端， 其特征在于， 所述终端还包括： 查找模块（ 3023 ): 用于从映射表中查找与负载信息对应的转移概率， 或与 延迟信息对应的延迟值； 运算模块（ 3024 ): 在 0~1 之间随机生成一个数字与网络重定向消息中的 转移概率进行比较选择是否进行载频切换， 或根据延迟值选择进行载频切换。 The terminal according to claim 13 or 14, wherein the terminal further comprises: a searching module (3023): configured to search for a transition probability corresponding to the load information from the mapping table, or correspond to the delay information. Delay value The operation module (3024): randomly generates a number between 0~1 and compares the transition probability in the network redirection message to select whether to perform carrier frequency switching, or select carrier frequency switching according to the delay value.
PCT/CN2008/072957 2007-11-06 2008-11-05 Method for receiving or transmitting assistant carrier frequency switching information and device thereof WO2009067890A1 (en)

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