WO2014117498A1 - 一种可见光通信设备及终端设备在接入点的切换方法 - Google Patents

一种可见光通信设备及终端设备在接入点的切换方法 Download PDF

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Publication number
WO2014117498A1
WO2014117498A1 PCT/CN2013/081333 CN2013081333W WO2014117498A1 WO 2014117498 A1 WO2014117498 A1 WO 2014117498A1 CN 2013081333 W CN2013081333 W CN 2013081333W WO 2014117498 A1 WO2014117498 A1 WO 2014117498A1
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WIPO (PCT)
Prior art keywords
access point
terminal device
target access
original
visible light
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Ceased
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PCT/CN2013/081333
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English (en)
French (fr)
Inventor
支周
田晓光
陈霖
禹忠
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ZTE Corp
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ZTE Corp
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Priority to EP13873801.8A priority Critical patent/EP2953277B1/en
Priority to US14/763,813 priority patent/US9615302B2/en
Publication of WO2014117498A1 publication Critical patent/WO2014117498A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • 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
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to a visible light communication technology, and more particularly to a solution for ensuring service continuity of a mobile terminal in an access point handover. Background technique
  • Visible Light Communications is a wireless communication technology that uses visible light with a frequency between 400 ⁇ (wavelength 780 nm) and 750 THz (wavelength 400 nm) as a communication medium to complete information transmission.
  • visible light communication uses LED visible light signal to transmit data.
  • the biggest feature of visible light communication is that it combines LED lighting technology with the name of "green lighting” to provide high-speed data transmission without electromagnetic interference while lighting. To solve the problem of narrow band and electromagnetic interference in broadband wireless systems.
  • the visible light transmission linear characteristic is easy to form a coverage dead zone.
  • the terminal device enters the target access point area from the original access point, which may cause the access service of the terminal device to be interrupted. Providing a visible light communication access switching process of the terminal device, which can provide a continuous access service for the terminal device and improve the user experience.
  • Embodiments of the present invention provide a method for switching visible light communication access to improve stability and service continuity of a handover process.
  • a method for switching a visible light communication terminal device at an access point according to an embodiment of the present invention includes:
  • the original access point of the terminal device selects the visible light communication device with stronger signal quality than the original access point according to the identification code and signal quality of each visible light communication device in the access list around the terminal device. Sending, by the target access point, the terminal device capability to the target access point, and initiating a handover request to the target access point; And the original access point indicates the selected working mode according to the target access point, and notifies the terminal device of the selected working mode, and forwards the response information fed back by the terminal device to the target access point. ;
  • the original access point After receiving the response information of the handover request and the downlink resource allocation information fed back by the target access point, the original access point sends a handover command to the terminal device to perform handover.
  • determining that the terminal device meets the handover condition includes:
  • the original access point determines that the terminal device meets the switching condition
  • the above method further includes:
  • the original access point sends a measurement control request to the terminal device
  • the terminal device reports the measurement parameter according to the measurement control requirement, and the reported measurement parameter includes an identification code and a signal quality of the visible light communication device that the terminal device can receive the signal.
  • the above method further includes:
  • the signal quality is stronger than the original access point, and the difference from the original access point signal quality is greater than the set value of the visible light communication device, and is selected as the target access point.
  • the terminal device capability is sent to the target access point, and the method includes:
  • the original access point sends the terminal device capability to the target access point by using an upper layer device.
  • the notifying the selected working mode to the terminal device includes: the original access point notifying the selected working mode to the terminal device by using a separate process; or The original access point notifies the terminal device of the selected working mode through a downlink allocation process.
  • the embodiment of the invention further provides a visible light communication device, the device comprising:
  • the first module is configured to: when it is determined that the terminal device accessed under the original access point meets the handover condition, the signal quality is stronger than the identifier and signal quality of each visible light communication device in the access list around the terminal device The visible light communication device of the original access point is selected as the target access point;
  • a second module configured to: send the terminal device capability to the target access point, and initiate a handover request to the target access point;
  • a third module configured to: indicate a selected working mode according to the target access point, notify the terminal device of the selected working mode, and forward the response information fed back by the terminal device to the target interface Entry point
  • a fourth module configured to: when receiving the response information of the handover request fed back by the target access point and the downlink resource allocation information, send a handover command to the terminal device to perform handover.
  • the first module is configured to: when the visible signal quality of the measurement report reported by the original access point receiving terminal device is lower than a threshold, determining that the terminal device meets a switching condition Or receiving the handover request initiated by the terminal device, determining that the terminal device meets the handover condition.
  • the device further includes:
  • a fifth module configured to: send a measurement control request to the terminal device, where the measurement control request indicates a measurement parameter reported by the terminal device, including an identifier and a signal quality of the visible optical communication device that the terminal device can receive the signal.
  • the first module is configured to select a target access point in the following manner: the signal quality is stronger than the original access point, and the difference between the signal quality and the original access point is greater than a set threshold
  • the visible light communication device is selected as the target access point.
  • the second module is configured to send the terminal device capability to the target access point in the following manner: by using a wired interface with the target access point, the terminal device Ability to send to the target access point; or pass the terminal device capability through an upper device Sent to the target access point.
  • the third module is configured to notify the terminal device of the selected working mode in the following manner: notifying the selected working mode to the terminal device by using a separate process; or The downlink assignment process notifies the terminal device of the selected mode of operation.
  • the embodiment of the present invention ensures the reliability and validity of the access handover by negotiating between the terminal device and the target access point, and maintains a certain acceptable service quality.
  • 1 is a schematic diagram of coverage blind spots of two access points in visible light communication
  • the embodiment provides a method for switching visible light communication access.
  • the current visible light communication access point of the terminal device is called the original access point
  • the access point to be accessed is called a target connection. Entry point.
  • the upper layer device above the original access point and the target access point may also be involved in the handover process, which may be a gateway or other device.
  • the terminal device accesses the target access point by measuring, notifying, and initiating handover signaling, and the target access point is ready to accept the terminal device request, and performing the access handover.
  • the embodiment provides a method for switching a visible light communication terminal device at an access point, including:
  • the original access point of the terminal device When a terminal device meets the handover condition, the original access point of the terminal device has a stronger signal quality than the original access point according to the identification code of each visible light communication device in the access list around the terminal device and its corresponding signal quality.
  • the visible light communication device is selected as the target access point, and the terminal device capability is sent to the target access point, and the handover request is initiated to the target access point;
  • the original access point indicates the selected working mode according to the target access point, and notifies the terminal device, and forwards the response information fed back by the terminal device to the target access point;
  • the original access point When receiving the response information of the handover request and the downlink resource allocation information fed back by the target access point, the original access point transmits a handover command to the terminal device to perform handover.
  • the method for determining that a terminal device meets the handover condition includes the following two types:
  • the original access point determines that the terminal device meets the switching condition.
  • the terminal device when the terminal device performs measurement, it is determined that the visible light signal quality of the original access point is lower than the threshold value, and then determining that the terminal device meets the handover condition, and may initiate a handover request to the original access point.
  • the original access point may also send a measurement control request to the terminal device, so that when the terminal device reports the measurement parameter according to the measurement control request, the identification code and signal quality of different visible light communication devices that the terminal device can receive are obtained. All reported to the original access point.
  • the original access point selects the target access point, it can refer to the signal quality of each visible light communication device reported by the terminal device.
  • the preferred solution proposes that when the original access point selects the target access point, the signal quality is required to be stronger than the original access point, and the original access point is The visible light communication device whose difference in point signal quality is larger than the set range is selected as the target access point. That is, the original access point is switched to the target access point only when the original access point signal is degraded and the access point signal strength around the terminal device is strong enough.
  • the process of the access point switching by the visible light communication terminal device is described below with reference to FIG. 2, and the process includes the following steps 201 to 212.
  • Step 201 The terminal device performs measurement, and reports to the original access point.
  • Step 202 When the quality of the visible light signal reported by the terminal device is lower than a certain threshold, the original access Point to make a decision to switch, according to the surrounding access list, select the target access point;
  • Step 203 The original access point informs the target access point of the foregoing terminal device capability, and sends a request for handover to the target access point.
  • the original access point notifies the target access point through the wired interface with the target access point; or the upper access device of the original access point, (the upper layer device may be the management gateway) notifies the target access point of various information.
  • Step 204 target access point decision
  • Step 205 The target access point informs the original access point to select a working mode.
  • the target access point notifies the original access point through the wired interface of the target access point; or notifies the original access point through the upper management gateway of the target access point.
  • Step 206 The original access point informs the terminal device of the selected working mode of the target access point.
  • the original access point informs the selected working mode of the terminal device by a separate process and prepares to switch; or selects the selected working mode.
  • the notification is included in the process of downlink allocation.
  • Step 207 The terminal device sends a response signal.
  • Step 208 The original access point forwards the response signal to the target access point.
  • Step 209 The target access point performs admission control, so that the terminal device to be switched accesses the target access point.
  • Step 210 The target access point sends a response signal of the handover request to the original access point.
  • Step 211 downlink resource allocation information transmission
  • Step 212 The original access point sends a handover command to the terminal device.
  • step 201 Before performing step 201, the following operations may also be included:
  • the terminal device reports measurement parameters including the signal quality of different neighboring access points that the terminal device can receive.
  • the terminal device can select any of the following access methods before accessing the new device: The terminal device is disconnected from the original access point and accesses the new access point.
  • the terminal device maintains a normal connection with the original access point, and disconnects from the original access point after the connection with the new access point is normal.
  • FIG. 3 is a process of including a terminal device handover key process, in which a user equipment leaves the original access point and accesses the target access point.
  • the process includes the following steps 301 to 320:
  • Step 301 The access point sends a measurement control request to the user equipment.
  • Step 302 The original access point performs a handover decision.
  • Step 303 The original access point reports the terminal device capability and the handover request to the target access point.
  • the original access point informs the target access point user equipment of the multi-antenna working mode set through the wired interface.
  • two possible modes are included:
  • the original access point notifies the target access point through a wired interface with the target access point
  • Step 304 the target access point makes a handover decision
  • Step 305 The target access point notifies the original access point to prepare for handover;
  • Step 306 The original access point sends a preparation switch to the terminal device.
  • Step 307 The target access point performs admission control, so that the user equipment to be switched accesses the target access point.
  • Step 308 The target access point sends a handover response to the original access point.
  • Step 309 The original access point sends downlink resource allocation information to the user equipment.
  • Step 310 The original access point sends a handover command to the user equipment.
  • Step 311 After the new link preparation is completed, the user equipment is disconnected from the original access point.
  • Step 312 The user equipment sends a synchronization request to the target access point.
  • Step 313 The target access point sends resource allocation information to the user equipment.
  • Step 314 The user equipment sends the target access point handover confirmation information.
  • Step 315 The target access point sends a handover end command to the upper layer device.
  • Step 316 The upper device performs path switching.
  • Step 317 The upper device sends a handover end response signal to the target access point.
  • Step 318 The target access point issues a release resource command to the original access point.
  • Step 319 the original access point clears the downlink buffer data, and continues to transmit data
  • Step 320 The original access point releases all user equipment resources.
  • the user equipment fully accesses the target access point and begins to provide connection services.
  • the present embodiment provides a visible light communication device, which can implement the method of Embodiment 1 above, and the device includes the following modules.
  • the first module is configured to: when a certain terminal device accessed by the device meets the switching condition, the signal quality is strong according to the identification code of each visible light communication device in the access list around the terminal device and the corresponding signal quality thereof The visible light communication device at the original access point is selected as the target access point;
  • the first module when the visible light signal quality in the measurement report reported by the receiving terminal device of the device is lower than the threshold value, determining that the terminal device meets the switching condition; or determining the terminal when receiving the handover request initiated by the terminal device The device meets the switching conditions.
  • the difference between the signal quality of the first access point and the original access point is greater than the set threshold, so as to prevent the terminal from frequently switching. causes wasted system resources.
  • the second module is configured to: send the terminal device capability to the target access point, and initiate a handover request to the target access point;
  • the second module can send the terminal device capability to the target access point through a wired interface with the target access point or through an upper layer device.
  • the third module is configured to: according to the target access point indication, select a working mode, and notify the terminal device, and forward the response information fed back by the terminal device to the target access point;
  • the third module can be selected by a separate process or by a downlink allocation process The working mode is notified to the terminal device.
  • the fourth module is configured to: when receiving the response information of the handover request fed back by the target access point and the downlink resource allocation information, send a handover command to the terminal device to perform handover.
  • the device may further include a fifth module, where the module is configured to: send a measurement control request to the terminal device, where the measurement control request indicates the measurement parameter reported by the terminal device, including the different visible light communication that the terminal device can receive.
  • the embodiment of the present invention ensures the reliability and validity of the access handover by negotiating between the terminal device and the target access point, and maintains a certain acceptable service quality.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
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Abstract

一种可见光通信设备及终端设备在接入点的切换方法和设备，涉及可见光通信技术，为可见光通信设备配置不同的识别码；当某一终端设备满足切换条件时，该终端设备的原接入点根据周围接入列表，将信号质量强于原接入点的可见光通信设备选为目标接入点，将终端设备能力发送给目标接入点，发起切换请求；原接入点根据目标接入点指示选定工作模式，通知给终端设备，将终端设备反馈的应答转发给目标接入点；原接入点收到目标接入点反馈的切换请求的应答以及下行资源分配信息时，向终端设备发送切换命令以进行切换。

Description

一种可见光通信设备及终端设备在接入点的切换方法 技术领域
本发明涉及可见光通信技术， 特别涉及一种保证移动终端在接入点切换 中的业务连续性的方案。 背景技术
可见光通信 ( VLC, Visible Light Communications ) , 是一种无线通信技 术， 它利用频率介于 400 ΤΗζ (波长为 780 nm )至 750THz (波长为 400 nm ) 之间的可见光作为通信媒介完成信息传送。
可见光通信作为一种无线接入技术， 它使用 LED可见光信号传输数据， 可见光通信最大的特色是其结合了具有 "绿色照明"之称的 LED 照明技术,在 照明同时提供无电磁干扰的高速数据传输， 解决宽带无线系统的频带狭窄和 电磁干扰的问题。
虽然可见光通信有以上优点， 但是可见光传输直线特性容易形成覆盖盲 区， 如图 1所示， 终端设备从原接入点进入目标接入点区域， 此时可能造成 终端设备的接入服务中断， 通过提供终端设备的可见光通信接入切换流程， 可以为终端设备提供连续的接入服务， 改善用户体验。
发明内容
本发明实施例提供一种可见光通信接入切换的方法，以提高切换过程的 稳定性和业务连续性。 本发明实施例公开的一种可见光通信终端设备在接入点的切换方法， 包 括：
当终端设备满足切换条件时， 该终端设备的原接入点根据该终端设备周 围接入列表中各可见光通信设备的识别码及信号质量， 将信号质量强于原接 入点的可见光通信设备选择为目标接入点， 将所述终端设备能力发送给所述 目标接入点， 向所述目标接入点发起切换请求； 所述原接入点根据所述目标接入点指示选定工作模式， 并将选定的工作 模式通知给所述终端设备， 将所述终端设备反馈的应答信息转发给所述目标 接入点；
所述原接入点接收到所述目标接入点反馈的切换请求的应答信息以及下 行资源分配信息后， 向所述终端设备发送切换命令， 进行切换。 较佳地， 上述方法中， 确定终端设备满足切换条件包括：
所述原接入点接收终端设备上报的测量报告中可见光信号质量低于阔 值， 则所述原接入点确定所述终端设备满足切换条件； 或者
所述终端设备进行测量时， 判断原接入点的可见光信号质量低于阔值， 则确定本终端设备满足切换条件， 向所述原接入点发起切换请求。 较佳地， 上述方法还包括：
所述原接入点向所述终端设备发送测量控制要求；
所述终端设备根据所述测量控制要求上报测量参数， 所上报的测量参数 中包括所述终端设备可接收到信号的可见光通信设备的识别码及信号质量。 较佳地， 上述方法还包括：
所述原接入点选择目标接入点时， 将信号质量强于原接入点， 且与原接 入点信号质量之差大于设定阔值的可见光通信设备， 选择为目标接入点。 较佳地， 上述方法中， 将所述终端设备能力发送给所述目标接入点， 包 括：
所述原接入点通过与所述目标接入点的有线接口将所述终端设备能力发 送给所述目标接入点； 或者
所述原接入点通过上层设备将所述终端设备能力发送给所述目标接入 点。 较佳地， 上述方法中， 将选定的工作模式通知给所述终端设备， 包括： 所述原接入点利用单独过程将选定的工作模式通知给所述终端设备； 或 者 所述原接入点通过下行分配过程将选定的工作模式通知给所述终端设 备。 本发明实施例还提供一种可见光通信设备， 该设备包括：
第一模块， 其设置为： 当确定原接入点下接入的终端设备满足切换条件 时，根据该终端设备周围接入列表中各可见光通信设备的识别码及信号质量， 将信号质量强于原接入点的可见光通信设备选择为目标接入点；
第二模块， 其设置为： 将所述终端设备能力发送给所述目标接入点， 向 所述目标接入点发起切换请求；
第三模块， 其设置为： 根据所述目标接入点指示选定工作模式， 并将选 定的工作模式通知给所述终端设备， 将所述终端设备反馈的应答信息转发给 所述目标接入点；
第四模块， 其设置为： 接收到所述目标接入点反馈的切换请求的应答信 息以及下行资源分配信息时， 向所述终端设备发送切换命令， 进行切换。
较佳地， 上述设备中， 所述第一模块， 是设置为： 在所述原接入点接收 终端设备上报的测量报告中可见光信号质量低于阔值时， 确定所述终端设备 满足切换条件； 或者收到所述终端设备发起的切换请求时， 确定所述终端设 备满足切换条件。 较佳地， 上述设备还包括：
第五模块， 其设置为： 向所述终端设备发送测量控制要求， 该测量控制 要求指示终端设备上报的测量参数， 包括所述终端设备可接收到信号的可见 光通信设备的识别码及信号质量。
较佳地， 上述设备中， 所述第一模块是设置为以如下方式选择目标接入 点： 将信号质量强于原接入点， 且与原接入点信号质量之差大于设定阔值的 可见光通信设备， 选择为目标接入点。 较佳地， 上述设备中， 所述第二模块是设置为以如下方式将所述终端设 备能力发送给所述目标接入点： 通过与所述目标接入点的有线接口将所述终 端设备能力发送给所述目标接入点； 或者通过上层设备将所述终端设备能力 发送给所述目标接入点。
较佳地， 上述设备中， 所述第三模块是设置为以如下方式将选定的工作 模式通知给所述终端设备： 利用单独过程将选定的工作模式通知给所述终端 设备； 或者通过下行分配过程将选定的工作模式通知给所述终端设备。
本发明实施例通过在终端设备与目标接入点之间的协商保证接入切换的 可靠性和有效性， 并保持一定的可接受的业务质量。
附图概述
图 1是可见光通信中两个接入点覆盖盲区示意图；
图 2是本实施例中可见光通信接入切换的流程图；
图 3是本优选实施例中可见光通信接入切换的流程图。 本发明的较佳实施方式
下文将结合附图对本发明的较佳实施方式作详细说明。 需要说明的是， 在不冲突的情况下， 本申请的实施例和实施例中的特征可以任意相互组合。
实施例 1
发明人考虑到切换操作涉及可见光通信测量， 可以为不同的可见光通信 设备分别设置不同的识别码， 这样， 终端设备可以通过识别码区分不同接入 点的信号强度及其它接入信息。 基于此， 本实施例提供一种可见光通信接入 切换的方法，在此切换过程中，终端设备的当前可见光通信接入点称为原接入 点， 所要接入的接入点称为目标接入点。 在切换过程中还可能涉及在原接入 点和目标接入点之上的上层设备， 可能为网关或其它设备。 终端设备通过测 量， 通知， 发起切换信令等过程接入目标接入点， 目标接入点准备接受终端 设备请求， 执行接入切换即可。 基于上述思想， 本实施例提供一种可见光通信终端设备在接入点的切换 方法， 包括：
当某一终端设备满足切换条件时， 该终端设备的原接入点根据该终端设 备周围接入列表中各可见光通信设备的识别码及其对应的信号质量， 将信号 质量强于原接入点的可见光通信设备选择为目标接入点， 将该终端设备能力 发送给目标接入点， 向目标接入点发起切换请求；
原接入点根据目标接入点指示选定工作模式， 并通知给终端设备， 将终 端设备反馈的应答信息转发给目标接入点；
原接入点接收到目标接入点反馈的切换请求的应答信息以及下行资源分 配信息时， 向终端设备发送切换命令， 进行切换。
而确定某一终端设备满足切换条件的方式包括如下两种：
第一， 原接入点接收终端设备上报的测量报告中可见光信号质量低于阔 值时， 则原接入点确定该终端设备满足切换条件。
第二， 终端设备进行测量时， 判断原接入点的可见光信号质量低于阔值， 则确定本终端设备满足切换条件， 向原接入点发起切换请求即可。
另外， 原接入点还可以向终端设备发送测量控制要求， 这样， 终端设备 根据该测量控制要求上报测量参数时， 就会将终端设备可接收到的不同可见 光通信设备的识别码及其信号质量全部上报给原接入点。 而原接入点选择目 标接入点时， 即可参考终端设备上报的各可见光通信设备的信号质量。
还要特别指出的是， 考虑到频繁的切换会造成系统资源浪费， 故优选方 案提出， 原接入点选择目标接入点时， 要求将信号质量强于原接入点， 且与 原接入点信号质量之差大于设定范围的可见光通信设备，选择为目标接入点。 也就是说， 仅当原接入点信号变差且终端设备周围的接入点信号强度足够强 时才会从原接入点切换到目标接入点。
下面结合图 2 , 说明可见光通信终端设备进行接入点切换的过程， 该过 程包括如下步骤 201至 212。
步骤 201 , 终端设备进行测量， 向原接入点报告；
步骤 202 , 当终端设备上报的可见光信号质量低于一定阔值， 则原接入 点做出切换的决定， 根据周围接入列表， 选择目标接入点；
步骤 203 , 原接入点告知目标接入点上述终端设备能力， 并向目标接入 点发出切换的请求；
该步骤中， 原接入点通过与目标接入点的有线接口通知目标接入点； 或 者通过原接入点的上层设备， （上层设备可能为管理网关）通知目标接入点 各种信息。
步骤 204, 目标接入点决策；
步骤 205 , 目标接入点告知原接入点选定工作模式；
该步骤中， 目标接入点通过目标接入点的有线接口通知原接入点； 或者 通过目标接入点的上层管理网关通知原接入点。
步骤 206, 原接入点告知终端设备目标接入点选定的工作模式； 该步骤中， 原接入点用单独过程告知终端设备选定的工作模式并准备切 换； 或者将选定的工作模式的通知包含在下行分配的过程之中。
步骤 207 , 终端设备发送应答信号；
步骤 208, 原接入点向目标接入点转发应答信号；
步骤 209 , 目标接入点做出准许控制， 以便待切换的终端设备接入目标 接入点；
步骤 210, 目标接入点向原接入点发送切换请求的应答信号；
步骤 211 , 下行资源分配信息传送；
步骤 212, 原接入点向终端设备发送切换命令。
在上述流程中， 在执行步骤 201之前， 还可以包括如下操作：
( A )原接入点向终端设备发送要求测量控制的要求；
( B )终端设备报告测量参数，测量参数中包括终端设备可接收到的不同 相邻接入点的信号质量。
另外， 除以上流程外， 终端设备接入新设备前可以选择以下的任一种接 入方法： 终端设备与原接入点断开， 接入新接入点。
终端设备保持与原接入点的正常连接， 与新接入点连接正常后断开与原 接入点连接。
下面结合图 3， 说明一个应用实例， 是一个包含终端设备切换关键流程， 一个用户设备离开原接入点并接入目标接入点的过程。 该过程包括如下步骤 301至 320:
步骤 301 , 接入点给用户设备发送测量控制的要求；
步骤 302 , 原接入点进行切换决策；
步骤 303 , 原接入点向目标接入点报告终端设备能力， 切换请求； 原接入点通过有线接口告诉目标接入点用户设备的多天线工作模式集 合； 在此包括两种可能的方式：
a. 原接入点通过与目标接入点的有线接口通知目标接入点；
b. 通过接入点的上层设备通知目标接入点；
步骤 304, 目标接入点做出切换决策；
步骤 305 , 目标接入点通知原接入点准备切换；
步骤 306 , 原接入点向终端设备发出准备切换；
步骤 307 , 目标接入点做出准许控制， 以便待切换的用户设备接入目标 接入点；
步骤 308, 目标接入点向原接入点发送切换应答；
步骤 309, 原接入点向用户设备发送下行资源分配信息；
步骤 310, 原接入点向用户设备发送切换命令；
步骤 311 , 新链路准备工作完成后， 用户设备从原接入点断开； 步骤 312 , 用户设备向目标接入点发出同步请求；
步骤 313， 目标接入点给用户设备发送资源分配信息；
步骤 314, 用户设备发给目标接入点切换确认信息； 步骤 315 , 目标接入点向上层设备发送切换结束命令；
步骤 316, 上层设备执行路径切换；
步骤 317 , 上层设备给目标接入点发送切换结束应答信号；
步骤 318, 目标接入点给原接入点发出释放资源命令；
步骤 319, 原接入点清空下行緩冲数据， 继续传送数据；
步骤 320, 原接入点释放所有用户设备资源；
用户设备完全接入目标接入点， 开始提供连接服务。
实施例 2
本实施例提供一种可见光通信设备， 可实现上述实施例 1的方法， 该设 备包括如下各模块。
第一模块， 设置为： 当本设备下接入的某一终端设备满足切换条件时， 根据该终端设备周围接入列表中各可见光通信设备的识别码及其对应的信号 质量， 将信号质量强于原接入点的可见光通信设备选择为目标接入点；
需要说明的是， 第一模块， 在本设备接收终端设备上报的测量报告中可 见光信号质量低于阔值时， 确定终端设备满足切换条件； 或者在收到终端设 备发起的切换请求时， 确定终端设备满足切换条件。
优选地， 第一模块选择目标接入点时， 除了要求信号质量强于原接入点 夕卜， 还要求其与原接入点信号质量之差大于设定阔值， 以防止终端频繁切换， 造成系统资源浪费。
第二模块， 设置为： 将终端设备能力发送给目标接入点， 向目标接入点 发起切换请求；
较佳地， 第二模块， 可以通过与目标接入点的有线接口， 或者通过上层 设备将终端设备能力发送给目标接入点。
第三模块， 设置为： 根据目标接入点指示选定工作模式， 并通知给终端 设备， 将终端设备反馈的应答信息转发给目标接入点；
较佳地， 第三模块， 可利用单独过程， 或者通过下行分配过程将选定的 工作模式通知给终端设备。
第四模块， 设置为： 接收到目标接入点反馈的切换请求的应答信息以及 下行资源分配信息时， 向终端设备发送切换命令， 进行切换。
一些优选方案还提出， 上述设备可以包括第五模块， 该模块设置为： 向 终端设备发送测量控制要求，该测量控制要求指示终端设备上报的测量参数， 包括终端设备对可接收到的不同可见光通信设备的识别码及其信号质量， 从 而便于第一模块进行目标接入点的选择。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本申请不限制于任 何特定形式的硬件和软件的结合。
以上所述， 仅为本发明的较佳实例而已， 并非用于限定本发明的保护范 围。 凡在本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。
工业实用性
本发明实施例通过在终端设备与目标接入点之间的协商保证接入切换的 可靠性和有效性， 并保持一定的可接受的业务质量。

Claims

权 利 要 求 书
1、 一种可见光通信终端设备在接入点的切换方法， 该方法包括： 当终端设备满足切换条件时， 该终端设备的原接入点根据该终端设备周 围接入列表中各可见光通信设备的识别码及信号质量， 将信号质量强于原接 入点的可见光通信设备选择为目标接入点， 将所述终端设备能力发送给所述 目标接入点， 向所述目标接入点发起切换请求；
所述原接入点根据所述目标接入点指示选定工作模式， 并将选定的工作 模式通知给所述终端设备， 将所述终端设备反馈的应答信息转发给所述目标 接入点；
所述原接入点接收到所述目标接入点反馈的切换请求的应答信息以及下 行资源分配信息后， 向所述终端设备发送切换命令， 进行切换。
2、 如权利要求 1所述的方法， 其中， 确定终端设备满足切换条件包括： 所述原接入点接收终端设备上报的测量报告中可见光信号质量低于阔 值， 则所述原接入点确定所述终端设备满足切换条件； 或者
所述终端设备进行测量时， 判断原接入点的可见光信号质量低于阔值， 则确定本终端设备满足切换条件， 向所述原接入点发起切换请求。
3、 如权利要求 1或 2所述的方法， 所述方法还包括：
所述原接入点向所述终端设备发送测量控制要求；
所述终端设备根据所述测量控制要求上报测量参数， 所上报的测量参数 中包括所述终端设备可接收到信号的可见光通信设备的识别码及信号质量。
4、 如权利要求 3所述的方法， 该方法还包括：
所述原接入点选择目标接入点时， 将信号质量强于原接入点， 且与原接 入点信号质量之差大于设定阔值的可见光通信设备， 选择为目标接入点。
5、 如权利要求 3所述的方法， 其中， 将所述终端设备能力发送给所述目 标接入点， 包括：
所述原接入点通过与所述目标接入点的有线接口将所述终端设备能力发 送给所述目标接入点； 或者
所述原接入点通过上层设备将所述终端设备能力发送给所述目标接入 点。
6、 如权利要求 3所述的方法， 其中， 将选定的工作模式通知给所述终端 设备， 包括：
所述原接入点利用单独过程将选定的工作模式通知给所述终端设备； 或 者
所述原接入点通过下行分配过程将选定的工作模式通知给所述终端设 备。
7、 一种可见光通信设备， 该设备包括：
第一模块， 其设置为： 当确定原接入点下接入的终端设备满足切换条件 时，根据该终端设备周围接入列表中各可见光通信设备的识别码及信号质量， 将信号质量强于原接入点的可见光通信设备选择为目标接入点；
第二模块， 其设置为： 将所述终端设备能力发送给所述目标接入点， 向 所述目标接入点发起切换请求；
第三模块， 其设置为： 根据所述目标接入点指示选定工作模式， 并将选 定的工作模式通知给所述终端设备， 将所述终端设备反馈的应答信息转发给 所述目标接入点；
第四模块， 其设置为： 接收到所述目标接入点反馈的切换请求的应答信 息以及下行资源分配信息时， 向所述终端设备发送切换命令， 进行切换。
8、 如权利要求 7所述的设备， 其中，
所述第一模块， 是设置为： 在所述原接入点接收终端设备上报的测量报 告中可见光信号质量低于阔值时， 确定所述终端设备满足切换条件； 或者收 到所述终端设备发起的切换请求时， 确定所述终端设备满足切换条件。
9、 如权利要求 7或 8所述的设备， 该设备还包括：
第五模块， 其设置为： 向所述终端设备发送测量控制要求， 该测量控制 要求指示终端设备上报的测量参数， 包括所述终端设备可接收到信号的可见 光通信设备的识别码及信号质量。
10、 如权利要求 9所述的设备， 其中，
所述第一模块是设置为以如下方式选择目标接入点： 将信号质量强于原 接入点， 且与原接入点信号质量之差大于设定阔值的可见光通信设备， 选择 为目标接入点。
11、 如权利要求 9所述的设备， 其中，
所述第二模块是设置为以如下方式将所述终端设备能力发送给所述目标 接入点： 通过与所述目标接入点的有线接口将所述终端设备能力发送给所述 目标接入点；或者通过上层设备将所述终端设备能力发送给所述目标接入点。
12、 如权利要求 9所述的设备， 其中，
所述第三模块是设置为以如下方式将选定的工作模式通知给所述终端设 备： 利用单独过程将选定的工作模式通知给所述终端设备； 或者通过下行分 配过程将选定的工作模式通知给所述终端设备。
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