WO2012065411A1 - 切换基站方法及系统 - Google Patents
切换基站方法及系统 Download PDFInfo
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- WO2012065411A1 WO2012065411A1 PCT/CN2011/074135 CN2011074135W WO2012065411A1 WO 2012065411 A1 WO2012065411 A1 WO 2012065411A1 CN 2011074135 W CN2011074135 W CN 2011074135W WO 2012065411 A1 WO2012065411 A1 WO 2012065411A1
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- Prior art keywords
- base station
- mobile station
- wireless configuration
- level
- configuration
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000004044 response Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Definitions
- BACKGROUND A radio configuration (Radio Configuration, abbreviated as RC) in Code Division Multiple Access (CDMA) refers to a series of working modes of forward or reverse traffic channels, and each RC supports A set of data rate and physical channel parameters, including modulation characteristics and spreading rate.
- the mobile station and the base station can respectively support multiple wireless configurations in the forward and reverse directions, and the mobile station operates in one of the wireless configurations after entering the traffic channel.
- the mobile station moves from the source base station to the target base station, if the target base station does not support the wireless configuration in which the mobile station currently operates under the source base station, the mobile station cannot simultaneously establish wireless communication with the source and target base stations, and thus cannot pass the soft handover.
- the mode is switched to the target base station. If the target base station and the source base station belong to the same base station controller, since the base station controller can obtain the wireless configuration supported by the source base station and the target base station, it can direct the mobile station to work in the wireless configuration supported by both base stations, so that the mobile station It is possible to establish wireless communication with the two base stations at the same time, thereby implementing soft handover.
- a primary object of the present invention is to provide a method and system for switching a base station to solve at least one of the above problems.
- a method for handover base station including: when a mobile station switches a base station, a base station controller of the source base station instructs the mobile station to switch to a wireless configuration whose configuration level is lower than a current wireless configuration level; The mobile station switches from the source base station to the target base station after switching to the wireless configuration with the configuration level ⁇ the current wireless configuration level.
- the base station controller of the source base station instructing the mobile station to switch to the wireless configuration whose configuration level is lower than the current wireless configuration level includes: the base station controller of the source base station sends a wireless configuration switching instruction to the mobile station; The mobile station switches to a wireless configuration in which the configuration level is at the current wireless configuration level in response to the wireless configuration switching instruction.
- the wireless configuration described above at the current wireless configuration level is the wireless configuration of the highest configuration level.
- the handover of the mobile station from the source base station to the target base station includes: the mobile station maintaining a connection with the source base station and establishing a connection with the target base station; the mobile station at the source base station and the Soft handover between target base stations.
- the method further includes: the pilot that is reported by the base station controller of the source base station by the mobile station Signal strength determination switches the mobile station from the source base station to the target base station.
- a handover base station system including: a base station controller, a mobile station, where the base station controller is configured to indicate that the mobile station switches to a configuration level when the mobile station switches the base station
- the wireless configuration of the current wireless configuration level works; the mobile station is set to switch from the source base station to the target base station after switching to the wireless configuration configured to configure the current wireless configuration level.
- the base station controller is configured to send a wireless configuration switching instruction to the mobile station; the mobile station is configured to switch to a wireless configuration with a configuration level of a current wireless configuration level in response to the wireless configuration switching instruction.
- the wireless configuration described above at the current wireless configuration level is the wireless configuration of the highest configuration level.
- the mobile station is further configured to establish a connection with the target base station while maintaining a connection with the source base station, and complete soft handover.
- the base station controller is further configured to determine, by the pilot signal strength reported by the mobile station, to switch the mobile station from the source base station to the target base station.
- FIG. 1 is a flowchart of a method for handover base station according to an embodiment of the present invention
- FIG. 2 is a flowchart of a method for handover base station according to a preferred embodiment of the present invention
- FIG. 3 is a mobile station support according to an example of the present invention.
- FIG. 4 is a schematic structural diagram of a handover base station system according to an embodiment of the present invention.
- the method for switching a base station includes: Step S102: When a mobile station switches a base station, the base station controller of the source base station instructs the mobile station to switch to a wireless configuration configured at a current wireless configuration level. Work under. Step S104: The mobile station switches from the source base station to the target base station after switching to the wireless configuration whose configuration level is lower than the current wireless configuration level. Since the wireless configuration is backward compatible, base stations supporting high-level wireless configurations can be compatible with low-level wireless configurations, in other words when mobile stations operating in lower-level wireless configurations switch to target base stations that support higher-level wireless configurations.
- the method further includes: Step S202: The base station controller of the source base station determines to switch the mobile station from the source base station to the target base station by using the pilot signal strength reported by the mobile station.
- the base station controller of the source base station may determine, by using the pilot signal strength of the mobile station, which base station the mobile station needs to switch to determine the target base station.
- step S102 the base station controller of the source base station instructs the mobile station to switch to the radio configuration configured to configure the current radio configuration level to further include the following processing: Step S204, the source base station The base station controller transmits a wireless configuration switching command to the mobile station.
- Step S206 The mobile station switches to a wireless configuration whose configuration level is lower than the current wireless configuration level in response to the wireless configuration switching instruction.
- the wireless configuration switching instruction I guides the mobile station to reduce the wireless configuration, which is most convenient and fast.
- the wireless configuration of the current wireless configuration level may be set to the highest configuration level wireless configuration.
- the mobile station directly switches to the highest-level wireless configuration to ensure that dropped calls do not occur.
- the mobile station switching from the source base station to the target base station may further include the following processing: Step S208, the mobile station maintains a connection with the source base station, and establishes with the target base station. connection. Step S210, the mobile station performs soft handover between the source base station and the target base station. At the same time, maintaining the connection with the source base station and the target base station is a prerequisite for soft handover, and the soft handover mode is a representative handover mode for avoiding dropped calls. This method is preferred in the present invention.
- 3 is a schematic diagram of a mobile station switching from a base station supporting a higher level wireless configuration to a base station supporting a lower level wireless configuration belonging to another base station controller in accordance with an example of the present invention.
- the mobile station initiates a call at base station 2 of base station controller 1. After entering the traffic channel, the mobile station operates under the forward RC11 and the reverse RC8; the mobile station moves to the base station 3 under the base station controller 2, searches for the pilot of the base station 3, and reports the pilot strength measurement to the source base station controller.
- the base station controller 1 determines that the mobile station is moving to the coverage area of the base station controller 2 according to the pilot information reported by the mobile station, and directs (instructs) the mobile station under the base station 2 to go to the forward RC3 and the reverse RC3.
- FIG. 4 is a schematic structural diagram of a handover base station system according to an embodiment of the present invention.
- the handover base station system according to the embodiment of the present invention includes: a base station controller 42 configured to instruct the mobile station to switch to a wireless configuration whose configuration level is lower than the current wireless configuration level when the mobile station switches the base station.
- the mobile station 46 is configured to switch from the source base station to the target base station after operating in a wireless configuration that switches to the configuration level and the current wireless configuration level.
- the base station controller 42 may be configured to send a wireless configuration switching instruction to the mobile station; the mobile station 46 may be configured to operate in response to the wireless configuration switching instruction to switch to a wireless configuration having a configuration level of the current wireless configuration level.
- the base station controller 42 can direct the mobile station to lower the wireless configuration level by transmitting a wireless configuration switching command.
- the wireless configuration described above at the current wireless configuration level is the highest configuration level wireless configuration. Working in the most advanced level of wireless configuration ensures that mobile station 46 does not drop calls when switching base stations.
- the mobile station 46 can be arranged to establish a connection with the target base station while maintaining the connection with the source base station and complete the soft handoff.
- the base handover is performed preferentially using the soft handover mode.
- the base station controller 42 is further configured to determine that the mobile station 46 is handed over from the source base station to the target base station by the pilot signal strength reported by the mobile station.
- the preferred mode of operation of the base station controller 42 and the mobile station 46 in the above-described handover base station system can be referred to the description of FIG. 2 and FIG. 3, and is not mentioned here.
- the present invention provides a method for switching between two base station controllers, which solves the problem that at the base station controller boundary, since the wireless configurations supported by the base stations on both sides of the boundary are different, when moving
- the problem that the station cannot switch from the base station supporting the higher-level wireless configuration to the base station supporting the higher-level wireless configuration avoids the phenomenon of dropped calls and improves the user experience.
- the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
- the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
- the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
- the invention is not limited to any specific combination of hardware and software.
- the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.
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- Mobile Radio Communication Systems (AREA)
Abstract
本发明公开了一种切换基站方法及系统，上述切换基站方法包括：当移动台切换基站时，源基站的基站控制器指示该移动台切换到配置级别低于当前无线配置级别的无线配置下工作；该移动台在切换到配置级别低于当前无线配置级别的无线配置下工作之后，从源基站切换至目标基站。通过本发明提供的技术方案，解决了在基站控制器边界，由于边界两侧基站支持的无线配置不相同，当移动台从支持较高级别无线配置的基站向支持较低级别无线配置的基站移动时无法切换的问题，进而达到了在上述情况下可以持软切换的效果。
Description
切换基站方法及系统 技术领域 本发明涉及通信领域， 具体而言， 涉及一种切换基站方法及系统。 背景技术 码分多址接入（Code Division Multiple Access , 简称为 CDMA ) 中的无 线配置（Radio Configuration, 简称为 RC ), 是指一系列前向或反向业务信道 的工作模式， 每种 RC支持一套数据速率和物理信道参数， 包括调制特性和 扩频速率等。 移动台和基站可以在前向和反向两个方向上分别支持多种无线 配置， 移动台进入业务信道后工作在其中一种无线配置下。 当移动台从源基站向目标基站移动时， 如果目标基站不支持移动台当前 在源基站下工作的无线配置， 则移动台无法同时与源和目标基站建立无线通 信， 也就无法通过软切换的方式切换到目标基站。 如果目标基站和源基站属于同一个基站控制器， 由于基站控制器能够获 得源基站和目标基站支持的无线配置， 它可以引导移动台转到两个基站都支 持的无线配置下工作， 这样移动台能够同时与这两个基站建立无线通信， 从 而实现软切换。 但如果目标基站属于另一个基站控制器， 源基站控制器无法 获得目标基站支持的无线配置， 当源基站控制器向目标基站请求某种无线配 置的资源时， 如果目标基站不支持这种无线配置， 则请求会被拒绝， 从而导 致切换失败。 发明内容 本发明的主要目的在于提供一种切换基站方法及系统， 以解决上述问题 至少之一。 根据本发明的一个方面， 提供了一种切换基站方法， 包括： 当移动台切 换基站时， 源基站的基站控制器指示该移动台切换到配置级别低于当前无线 配置级别的无线配置下工作； 该移动台在切换到配置级别氐于当前无线配置 级别的无线配置下工作之后， 从源基站切换至目标基站。
上述源基站的基站控制器指示所述移动台切换到配置级别低于当前无线 配置级别的无线配置下工作包括： 所述源基站的基站控制器向所述移动台发 送无线配置切换指令； 所述移动台响应于所述无线配置切换指令， 切换到配 置级别 氏于当前无线配置级别的无线配置下工作。 上述氏于当前无线配置级别的无线配置为最氏配置级别的无线配置。 上述移动台从所述源基站切换至所述目标基站包括： 所述移动台保持与 所述源基站的连接， 并与所述目标基站建立连接； 所述移动台在所述源基站 和所述目标基站之间进行软切换。 在上述源基站的基站控制器引导所述移动台切换到配置级别低于当前无 线配置级别的无线配置下工作之前， 还包括： 所述源基站的基站控制器通过 所述移动台上报的导频信号强度确定将所述移动台从所述源基站切换到所述 目标基站。 根据本发明的另一个方面， 提供了一种切换基站系统， 包括： 基站控制 器、 移动台， 其中， 基站控制器， 设置为在移动台切换基站时， 指示该移动 台切换到配置级别 氐于当前无线配置级别的无线配置下工作； 移动台， 设置 为在切换到配置级别 氏于当前无线配置级别的无线配置下工作之后， 从源基 站切换至目标基站。 上述基站控制器， 设置为向所述移动台发送无线配置切换指令； 所述移 动台， 设置为响应所述无线配置切换指令， 切换到配置级别 氐于当前无线配 置级别的无线配置下工作。 上述氏于当前无线配置级别的无线配置为最氏配置级别的无线配置。 上述移动台还用在保持与所述源基站的连接的同时， 与所述目标基站建 立连接， 并完成软切换。 上述基站控制器， 还设置为通过所述移动台上报的导频信号强度确定将 所述移动台从所述源基站切换到所述目标基站。 通过本发明， 釆用在切换基站时引导移动台转到配置级别较氐的无线配 置下工作的方案， 解决了在基站控制器边界， 由于边界两侧基站支持的无线 配置不相同， 当移动台从支持较高级别无线配置的基站向支持较氐级别无线
配置的基站移动时无法切换的问题， 进而达到了在上述情况下可以实现软切 换的效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1是 居本发明实施例的切换基站方法的流程图； 图 2是根据本发明优选实施例的切换基站方法的流程图； 图 3是根据本发明实例的移动台从支持较高级别无线配置的基站向属于 另一个基站控制器的支持较低级别无线配置的基站切换的示意图； 图 4是 居本发明实施例的切换基站系统的架构示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 1是根据本发明实施例的切换基站方法的流程图。 如图其所示， 根据 本发明实施例的切换基站方法包括： 步骤 S 102, 当移动台切换基站时， 源基站的基站控制器指示移动台切换 到配置级别 氏于当前无线配置级别的无线配置下工作。 步骤 S 104 ,移动台在切换到配置级别 氐于当前无线配置级别的无线配置 下工作之后， 从源基站切换至目标基站。 由于无线配置是向下兼容的， 支持高级别无线配置的基站可以兼容低级 别的无线配置， 换句话说当在较低级别无线配置下工作的移动台向支持更高 级别无线配置的目标基站切换时不会出现掉话， 只有当在较高级别无线配置 下工作的移动台向只支持较低级别无线配置的目标基站切换时才会出现掉 话。 因此， 在本发明的技术方案中， 移动台在切换基站时， 不去比较源基站 和目标基站无线配置级别的高氐， 而是默认移动台当前工作的无线配置级别
较高， 目标基站支持的无线配置级别较低， 在切换基站时， 源基站的基站控 制器都会引导移动台降低其工作的无线配置级别， 这样一来就大大降低了掉 话发生的几率， 提高了用户体验。 同时由于无线配置是向下兼容， 即使实际 上是目标基站支持的无线配置级别更高， 移动台降低了无线配置级别， 也不 会对切换造成影响。 优选地， 如图 2所示， 步骤 S 102之前， 还可以包括： 步骤 S202,源基站的基站控制器通过移动台上报的导频信号强度确定将 移动台从源基站切换到目标基站。 在具体实施过程中， 源基站的基站控制器可以通过移动台上 ·ί艮的导频信 号强度确定该移动台需要向哪一个基站切换， 从而确定目标基站。 优选地， 如图 2所示， 步骤 S 102 中， 源基站的基站控制器指示移动台 切换到配置级别氏于当前无线配置级别的无线配置下工作可以进一步包括以 下处理： 步骤 S204, 源基站的基站控制器向所述移动台发送无线配置切换指令。 步骤 S206, 移动台响应于上述无线配置切换指令， 切换到配置级别 氐于 当前无线配置级别的无线配置下工作。 通过无线配置切换指令 I导移动台降低无线配置的方法， 实现上最为方 便、 快捷。 优选地， 步 4聚 S 102 中， 氐于当前无线配置级别的无线配置可以设置为 最氏配置级别无线配置。 切换基站时， 移动台直接切换到最氏级别的无线配置下工作可以确保掉 话不会出现。 优选地， 如图 2所示， 步骤 S 104 中， 移动台从源基站切换至目标基站 可以进一步包括以下处理： 步骤 S208, 移动台保持与所述源基站的连接， 并与所述目标基站建立连 接。 步骤 S210, 移动台在源基站和目标基站之间进行软切换。
同时保持与源基站和目标基站的连接是进行软切换的前提， 软切换方式 是避免掉话的具有代表性的切换方式， 本发明中优先使用这种方式。 图 3是根据本发明实例的移动台从支持较高级别无线配置的基站向属于 另一个基站控制器的支持较低级别无线配置的基站切换的示意图。 下面结合 实例对上述优选实施方式进行详细说明。 移动台在基站控制器 1的基站 2下发起呼叫。 进入业务信道后， 移动台 工作在前向 RC11、 反向 RC8下； 移动台向基站控制器 2下的基站 3移动， 并搜索到基站 3的导频， 向源 基站控制器报告导频强度测量消息； 基站控制器 1根据移动台上报的导频信息， 判断出移动台正在向基站控 制器 2的覆盖区域移动， 引导 （指示）基站 2下的移动台转到前向 RC3、 反 向 RC3下工作； 基站控制器 1引导移动台在前向 RC3 ,反向 RC3下软切换到基站控制器 2的基站 3下。 图 4是 居本发明实施例的切换基站系统的架构示意图。 如图 4所示， 根据本发明实施例的切换基站系统包括： 基站控制器 42 , 设置为在移动台切换基站时， 指示移动台切换到配置级 别氐于当前无线配置级别的无线配置下工作。 移动台 46 ,设置为在切换到配置级别 氐于当前无线配置级别的无线配置 下工作之后， 从源基站切换至目标基站。 上述系统充分利用了无线配置的向下兼容性， 由于移动台在从源基站切 换至目标基站前， 已经将配置级别降低了， 因此大大降低了掉话发生的几率， 提高了用户体验。 优选地， 基站控制器 42 , 可以设置为向移动台发送无线配置切换指令； 移动台 46 , 可以设置为响应无线配置切换指令， 切换到配置级别 氐于当前无 线配置级别的无线配置下工作。
在具体实施过程中， 基站控制器 42 可以通过发送无线配置切换指令引 导移动台降低无线配置级别。 优选地， 上述氏于当前无线配置级别的无线配置为最氏配置级别无线配 置。 在最氐级别的无线配置下工作可以确保移动台 46 在切换基站时不会出 现掉话。 优选地， 移动台 46 , 可以设置为在保持与源基站的连接的同时， 与目标 基站建立连接， 并完成软切换。 上述切换基站系统中， 优先使用软切换方式完成基站切换。 优选地， 基站控制器 42 , 还可以设置为通过移动台上报的导频信号强度 确定将移动台 46从源基站切换到目标基站。 上述切换基站系统中的基站控制器 42和移动台 46相互结合的优选工作 方式可以参见图 2和图 3的描述， 此处不再赞述。 从以上的描述中， 可以看出， 本发明提供了一种在两个基站控制器之间 切换的方法， 解决了在基站控制器边界， 由于边界两侧基站支持的无线配置 不相同， 当移动台从支持较高级别无线配置的基站向支持较氐级别无线配置 的基站移动时无法切换的问题， 避免了掉话现象的出现， 提高了用户体验。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。
Claims
1. 一种切换基站方法， 包括：
当移动台切换基站时， 源基站的基站控制器指示所述移动台切换 到配置级别 氏于当前无线配置级别的无线配置下工作；
所述移动台在切换到配置级别 氐于当前无线配置级别的无线配置 下工作之后， 从所述源基站切换至目标基站。
2. 根据权利要求 1所述的方法， 其中， 所述源基站的基站控制器指示所 述移动台切换到配置级别 氐于当前无线配置级别的无线配置下工作包 括：
所述源基站的基站控制器向所述移动台发送无线配置切换指令； 所述移动台响应于所述无线配置切换指令， 切换到配置级别 氐于 当前无线配置级别的无线配置下工作。
3. 根据权利要求 1所述的方法， 其中， 所述低于当前无线配置级别的无 线配置为最氏配置级别的无线配置。
4. 根据权利要求 1所述的方法， 其中， 所述移动台从所述源基站切换至 所述目标基站包括：
所述移动台保持与所述源基站的连接， 并与所述目标基站建立连 接；
所述移动台在所述源基站和所述目标基站之间进行软切换。
5. 根据权利要求 1所述的方法， 其中， 在所述源基站的基站控制器引导 所述移动台切换到配置级别 氐于当前无线配置级别的无线配置下工作 之前， 还包括：
所述源基站的基站控制器通过所述移动台上报的导频信号强度确 定将所述移动台从所述源基站切换到所述目标基站。
6. —种切换基站系统， 包括： 基站控制器、 移动台；
所述基站控制器， 设置为在所述移动台切换基站时， 指示所述移 动台切换到配置级别 氐于当前无线配置级别的无线配置下工作； 所述移动台， 设置为在切换到配置级别 氐于当前无线配置级别的 无线配置下工作之后， 从源基站切换至目标基站。
7. 根据权利要求 6所述的系统， 其中，
所述基站控制器， 设置为向所述移动台发送无线配置切换指令； 所述移动台， 设置为响应所述无线配置切换指令， 切换到配置级 别氐于当前无线配置级别的无线配置下工作。
8. 根据权利要求 6所述的系统， 其中， 所述低于当前无线配置级别的无 线配置为最氏配置级别的无线配置。
9. 根据权利要求 6所述的系统， 其中， 所述移动台还用在保持与所述源 基站的连接的同时， 与所述目标基站建立连接， 并完成软切换。
10. 根据权利要求 6所述的系统， 其中， 所述基站控制器， 还设置为通过 所述移动台上报的导频信号强度确定将所述移动台从所述源基站切换 到所述目标基站。
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| CN101803244A (zh) * | 2007-09-18 | 2010-08-11 | Lg电子株式会社 | 在无线通信系统中执行小区重新选择过程的方法 |
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| CN101080088A (zh) * | 2006-05-24 | 2007-11-28 | 普天信息技术研究院 | 一种无线通信中的硬切换方法 |
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