WO2009024013A1 - Procédé de transfert et dispositif utilisateur - Google Patents

Procédé de transfert et dispositif utilisateur Download PDF

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Publication number
WO2009024013A1
WO2009024013A1 PCT/CN2008/001344 CN2008001344W WO2009024013A1 WO 2009024013 A1 WO2009024013 A1 WO 2009024013A1 CN 2008001344 W CN2008001344 W CN 2008001344W WO 2009024013 A1 WO2009024013 A1 WO 2009024013A1
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WO
WIPO (PCT)
Prior art keywords
cell
signal strength
transmission
reserved
user equipment
Prior art date
Application number
PCT/CN2008/001344
Other languages
English (en)
French (fr)
Inventor
Yonggang Wang
Original Assignee
Alcatel Shanghai Bell Co., Ltd.
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Shanghai Bell Co., Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Co., Ltd.
Priority to US12/673,024 priority Critical patent/US8503401B2/en
Publication of WO2009024013A1 publication Critical patent/WO2009024013A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • 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
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to handover of user equipment between different communication areas, and particularly relates to
  • 3GPP launched the 3G Long Term Evolution project in 2005 to evolve the access technologies, such as E-UTRA, and evolved access networks, such as E-UTRAN, for the growing needs of operators and users. Provide better support. It is explicitly stated in LTE that the evolved MBMS monthly service (E-MBMS) should be supported.
  • E-MBMS is a service introduced in 3GPP Rel.6. It refers to a point-to-multipoint wireless overnight service in which a data source sends data to multiple users, thereby realizing the evolution of network resources including the core network and the access network. Minimize resources to achieve the services of multimedia users with as many different needs as possible.
  • the introduction of the MBMS adds three logical channels to the standard, namely the MBMS control channel MCCH, the MBMS service channel MTCH and the MBMS scheduling channel MSCH, wherein the MCCH channel needs to notify the user equipment about the relevant control information of the MBMS service in time, and therefore is in the cell. There has been.
  • EMBMS is one of the most important features of MBMS evolution technology. Its business data is merged with MBSFN (MBMS Single Frequency Network) on the air structure. That is, for the same service, data transmitted by different base stations is designed to transmit the same content at the same time. Thus, the user equipment will likely receive a natural superposition of physical signals from the plurality of base stations having the same content over the air interface, and the received signal to noise ratio is multiplied.
  • the set of cells that can achieve MBSFN transmission in this way is called the MBSFN area.
  • corresponding service data is used in various forms in the access network.
  • a service that does not participate in MBSFN transmission uses a single cell transmission mode in an access network.
  • RAN2 #58 has proposed that the transmission of MBMS services in E-UTRAN can be either single cell transmission or multi-cell (MBSFN) transmission.
  • MBSFN multi-cell
  • the feature of multi-cell transmission is that in the MBSFN area, multiple cells simultaneously transmit MBMS services and support merging of MBMS transmissions from multiple cells.
  • single cell transmission is characterized in that MBMS traffic is only transmitted within the coverage of a particular cell and does not support the merging of MBMS transmissions from multiple cells. Therefore, when the user equipment moves, especially in the case of moving between the .MBSFN area and the non-MBSFN area, the user equipment needs to perform handover and 'Transmission mode switching operation to provide continuous MBMS service. Summary of the invention
  • the present invention has been accomplished in view of the above problems. It is an object of the present invention to provide a method for performing handover between an MBSFN and a non-MBSFN area and a corresponding user equipment, which can provide continuous contiguous to the user in the case where the user equipment moves between different communication areas.
  • MBMS service
  • a handover method in a communication network through which; includes forming a first communication network MBSFN area cell, a second cell and the boundary is not formed in a first MBSFN area a reserved cell between the cell and the second cell, the reserved cell belongs to the MBSFN area, where the reserved cell indication information is broadcasted in the reserved cell, the method includes the steps of: receiving the reserved cell indication information, to learn that the user equipment is in the reserved cell Measuring a first signal strength based on the MBSFN transmission for the predetermined service in the reserved cell and a second signal strength based on the single cell transmission; and during a period in which the difference between the first signal strength and the second signal strength is less than a predetermined threshold, The first cell or the second cell is selected as the target cell.
  • the MBSFN transmission and the single cell transmission are multiplexed on the same carrier.
  • the MBSFN transmission and the single cell transmission are respectively on respective carriers, and the measuring step includes: measuring a signal strength on a current carrier, and measuring a signal on another carrier in a predetermined time period. Signal strength.
  • the signal strength may be the signal strength of the traffic channel or the signal strength of the reference signal on the traffic channel.
  • the handover method further comprises the steps of: selecting an MBSFN transmission and a single cell based on a PDCP SN of a PDCP for the predetermined service during the balance of the first signal strength and the second signal strength The data transferred.
  • the cell in which the signal strength ⁇ in the first cell and the second cell is selected is used as the target cell.
  • the reserved cell indication information is broadcast on the MCCH.
  • a mobile device for use in a communication network comprising a first cell forming an MBSFN area, a second cell not forming an MBSFN area, and a first cell and a second a reserved cell between the cells, the reserved cell belongs to the MBSFN area, where the reserved cell indication information is broadcasted in the reserved cell, and the mobile device includes: a transceiver device, receiving the reserved cell indication letter And determining, by the measuring device, the first signal strength based on MBSFN transmission and the second signal strength based on single cell transmission for the predetermined service in the reserved cell; wherein, in the first signal The first cell or the second cell is selected as the target cell during a period in which the difference between the intensity and the second signal strength is less than a predetermined threshold.
  • a continuous MBMS service can be provided to a user when the user equipment moves between the MBSFN area and the non-MBSFN area.
  • seamless handover is achieved.
  • the data transmitted by the MBSFN and the data transmitted by the single cell are combined by the PDCP SN, and the lossless transmission of the MBMS service data is realized.
  • FIG. 2 is a block diagram showing the structure of a user equipment according to a first embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the operation of the MBMS data extracting unit shown in FIG. 2.
  • FIG. 4 is a schematic diagram showing the execution process of the handoff method according to the first embodiment of the present invention;
  • FIG. 6 is a block diagram showing the structure of a user equipment according to a second embodiment of the present invention. detailed description
  • FIG. 1 is a schematic diagram illustrating a network environment to which a method and apparatus in accordance with a first embodiment of the present invention are applied.
  • the MBMS service and the unicast service are multiplexed in the same On the carrier.
  • both the MBMS service and the unicast service are transmitted on the carrier.
  • a cell that propagates the same MBMS service forms MBSFN, in which a certain service for a user is simultaneously transmitted in each cell in the MBSFN. Therefore, in MBSFN, the physical superposition of signals of the same service allows the user equipment 10 to receive signals without any handover in the MBSFN area.
  • the base station broadcasts the reserved cell indication information on its MCCH channel to inform the user equipment entering the cell that the cell in which it is located is a reserved cell, that is, in the vicinity of the boundary between the MBSFN area and the non-MBSFN area.
  • the base station transmits both MBMS service data and unicast service data on the carrier.
  • a service such as a mobile television program
  • the handoff can be implemented in the reserved area without causing interruption of the mobile television program.
  • FIG. 2 is a block diagram showing the structure of a user equipment according to a first embodiment of the present invention.
  • the user equipment according to the first embodiment of the present invention includes: a transceiver unit 11 configured to receive, from a carrier carrying the MBMS service and the unicast service, a service signal that the user wants to receive; the control unit 12;
  • the strength measuring unit 13 is configured to measure the strengths of the two signals received by the transceiver unit 11 for the same service under the control of the control unit 12, wherein the control unit 12 performs the strengths of the received two signals with a predetermined threshold.
  • MBMS data extracting unit 14 is configured to select service data from different cells in a period of time for performing handover, and merge the data according to the PDCP SN And presenting the single charge 15, processing the MBMS service data obtained by the MBMS data combining unit 14 and presenting it to the user.
  • the control unit 12 instructs the transceiver unit 11 to immediately target the MBSFN area and the single The cell transmission area reads information on the entire MCCH.
  • the control unit 12 can perform a handoff at an appropriate timing based on the strength of the two signals on the carrier for the same service.
  • the signal strength here can be the signal strength on the traffic channel or the strength of the reference signal on the traffic channel.
  • the control unit 12 commands the signal strength measuring unit 13 to measure different signal strengths for the same service on the carrier, and determines whether the absolute value of the difference between the two is less than a predetermined threshold.
  • a predetermined threshold In a case of a period of time, the transceiver unit 11 receives both the traffic signal from the multi-cell transmission and the service signal from the single-cell transmission. When the strengths of the two signals reach equilibrium, the control unit 12 instructs the transceiver unit 11 to perform cell selection, that is, to select the cell with a high signal strength.
  • the control unit 12 Since the switching is performed within a predetermined time period in which the signal strength of the single cell transmission is higher than the signal strength of the multi-cell transmission, it is possible to ensure that the handover is seamless. However, if the cell does not send the service, the control unit 12 establishes an RRC connection with the base station in the carrier through the transceiver unit 11 to trigger single-cell MBMS transmission for the service, but does not immediately perform the handover. Switching, the subsequent process is consistent with the above handoff process.
  • the user equipment 10 returns to the MSFN transmission cell again without triggering the RRC connection to terminate the MBMS single cell transmission.
  • the base station or the network can perform periodic polling to determine whether there is a user equipment in the reserved cell, thereby stopping the MBMS single cell transmission.
  • the user equipment can simultaneously receive the MBMS signal and the single cell signal, this optimized handover mechanism can obtain the advantages of UE non-destructive mobility.
  • the PDCP (Packet Data Convergence Protocol) layer is a layer common to the EMBMS GW (EMBMS Gateway), and the MBSFN cell and the single cell transmit the same PDCP SDU (Service Data Unit). Therefore, when the mobile television program is transmitted in the form of PDCP based on the PDCP SN (serial number), the MBMS data extracting unit 14 in the user equipment 10 can perform selective merging to provide the MBMS service under different conditions, and No packet transmission loss will occur.
  • the PDCP SDU for a certain service is transmitted from the EMBMS GW. Since the MBSFN area (multi-cell transmission) and the reserved cell (single-cell transmission) are transparent to the user equipment, at the PDCP layer of the user equipment 10, the MBMS data extracting unit 14 selects according to the PDCP SN for the service. The PDCP data is merged to form a data stream for the mobile television program. Further, the rendering unit 15 processes the obtained data stream and presents it to the user.
  • the hybrid cell that is, the 1BMS reserved cell
  • the hybrid cell that is, the 1BMS reserved cell
  • the user equipment 10 can receive the control information of the single cell transmission and the control information of the multi-cell transmission.
  • User equipment 10 then proceeds with service reception from two wireless telecommunications sources and combines the received packets based on PDCP. This process is similar to the above, except that switching from single cell transmission to multi-cell transmission, that is, transmission of the MBSFN area.
  • FIG. 4 is a diagram showing an execution procedure of a handover method according to a first embodiment of the present invention.
  • the user equipment 10 can receive the signal leaking from the MBSFN area, and does not need to perform the handover immediately, although the single cell transmission is in progress. Therefore, when the user equipment 10 has entered a relatively long distance in the reserved cell, for example, 3/4 of the cell radius as shown in FIG. 3, the handover is performed.
  • the control unit 12 instructs the transceiver unit 11 to select a cell with a high signal strength to complete the handover.
  • the MBMS data extracting unit 14 selects signals from two wireless telecommunication sources, extracts PDCP data for the mobile television program, and merges them.
  • the reason for choosing to switch during this time period is that the power of the service signal does not differ much before or after the handoff, or is less than a predetermined threshold. This ensures continuity of the MBMS service to the user.
  • the above-described first embodiment is directed to the case where the MBMS service and the unicast service are multiplexed on the same carrier.
  • the MBMS service can have a dedicated carrier, that is, the MBMS service is transmitted on a dedicated carrier, and the unicast service or other services (such as MBMS single cell transmission) are multiplexed on another carrier.
  • FIG. 5 is a schematic diagram illustrating a network environment to which the method and apparatus in accordance with the second embodiment of the present invention are applied.
  • the MBMS service in the MBSFN area is transmitted using a dedicated carrier, and other services are transmitted using another carrier, this constitutes a layered network structure.
  • the cells in the MBSFN area utilize dedicated carriers to transport an MBMS service, such as a mobile television program.
  • the mobile TV program can also be transmitted on another carrier, using a single cell mode but with different coverage.
  • the cellular network is layered, which can receive the mobile television program either in the MBSFN area or in the single cell transmission area. Since there are two different carriers, the user equipment 20 is required to perform handover based on inter-frequency measurement.
  • Handover between the dedicated carrier and the hybrid carrier requires the user equipment 20 to make an inter-frequency measurement during discontinuous reception (DRX) or in a corresponding time slot.
  • the reserved reserved cell indication information is broadcasted on the MCCH of the reserved cell, and is used to indicate to the user equipment 20 that the cell in which it is located is a reserved cell.
  • the user equipment 20 enters the reserved cell it reads the information on the MCCH. This helps to trigger the target The inter-frequency measurement of the target cell, and triggering itself and the network ready for MBMS service switching. Therefore, this reduces the continuous interruption time of the service of the user equipment.
  • FIG. 6 is a block diagram showing the structure of a user equipment according to a second embodiment of the present invention.
  • the user equipment according to the second embodiment of the present invention includes: a transceiver unit 21, including a first transceiver unit 11A that transmits and receives signals on a dedicated carrier, and a second transceiver unit 11B that transmits and receives signals on another carrier;
  • the signal strength measuring unit 23 is configured to measure the signal strength on the current carrier under the control of the control unit 22, and measure the signal strength on the other carrier during the DRX, where the control unit 12 will receive
  • the strengths of the two signals are compared with a predetermined threshold, and cell selection, that is, handover, is performed according to the comparison result;
  • MBMS data extracting unit 24 is configured to select service data from different cells before and after the handover is performed. And merging the data according to the PDCP SN; and the presentation unit 25 processes the MBMS service data obtained by the MBMS data extraction unit 24 and presents
  • the control unit 22 triggers the inter-frequency measurement action, and the signal strength measurement unit 23 measures the signal strength on the current carrier. Signal strength on another carrier. Then, the control unit 22 compares the inter-frequency measurement results of the serving cell and the neighboring cell to determine a cell with better reception conditions. User equipment 20 may automatically receive the MCCH of the neighboring cell during the inter-frequency measurement period. If the neighboring cell is transmitting the service, the UE performs cell selection at the appropriate time. For example, after the single cell signal strength is higher than the multi-cell signal strength for a predetermined time, a handoff is performed. However, if the cell does not transmit the service, the control unit 22 establishes an RRC connection in the hybrid carrier through the second transceiver unit 11B to trigger the MBMS transmission because there is no uplink in the dedicated carrier.
  • the base station When the user equipment 20 enters a hybrid cell having an overlapping area with a cell in the MBSFN area, the base station not only broadcasts its own control information but also broadcasts the carrier frequency and MCCH configuration information of the target cell in the MBSFN.
  • the first transceiver unit 11A in the user equipment 20 detects the MCCH in the target cell, and the signal strength on the dedicated channel is measured by the signal strength measuring unit 23, and the control unit 22 compares with the threshold to perform cell selection, that is, the handover. Switch.

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  • Computer Networks & Wireless Communication (AREA)
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Description

越区切换方法和用户设备 技术领域
本发明涉及用户设备在不同通信区域之间的越区切换， 具体涉及一种在
•MBSFN和非 MBSFN区域之间的执行越区切换的方法和相应的用户设备， 在用户 设备在不同的通信区域之间移动的情况下， 能够为用户提供连续的 MBMS服务。 背景技术
3GPP在 2005年启动了 3G长期演进研究项目 （Long Term Evolution), 以演进 的接入技术， 例如 E-UTRA, 和演进的接入网络， 例如 E-UTRAN, 为运营商和用 户不断增长的需求提供更好的支持。 在 LTE中明确提出， 应该支持演进的 MBMS 月艮务 （E-MBMS )。 MBMS是 3GPP Rel.6版本引入的一项业务， 是指一个数据源向 多个用户发送数据的点到多点无线通侉服务， 从而实现包括核心网和接入网的网 络资源的演进， 以尽可能少的资源实现对尽可能多的、 相同需求的多媒体用户的 ,服务。 MBMS的引入对标准增加了 3条逻辑信道，即 MBMS控制信道 MCCH，MBMS 业务信道 MTCH和 MBMS调度信道 MSCH， 其中 MCCH信道因为需要及时向用户 设备通知关于 MBMS服务的相关控制信息， 因此在小区中一直存在。
EMBMS作为 MBMS的演进技术， 一个最重要的特征是其业务数据在空中结 构上釆用 MBSFN ( MBMS Single Frequency Network) 合并。 即， 对于同一个业 务， 不同基站发送的数据被设计成在同一时刻发送相同的内容。 这样， 用户设备 在空中接口上将可能收到来自多个基站的具有相同内容的物理信号的自然叠加， 接收信噪比得到成倍的增加。 这样可以实现 MBSFN传输的小区的集合称为 MBSFN区域。 为了实现业务数据的 MBSFN传输， 相应的业务数据在接入网络中 '使用多种形式。 不参与 MBSFN传输的业务在接入网络中使用单小区传输模式。
另外 RAN2 # 58已经提出在 E-UTRAN中 MBMS业务的传输既可以是单小区 '传输，也可以是多小区（MBSFN)传输。如上所述，多小区传输的特征是在 MBSFN 区域中， 多个小区同时发送 MBMS业务， 并且支持来自多小区的 MBMS传输的合 并。 相反， 单小区传输的特征是 MBMS业务仅仅在特定小区的覆盖范围内传输， 并且不支持来自多小区的 MBMS传输的合并。 因此， 当用户设备移动时， 尤其在 .MBSFN区域和非 MBSFN区域之间移动的情况下， 用户设备需要执行越区切换和 '传输模式切换操作， 以便提供连续的 MBMS服务。 发明内容
. 鉴于上述问题， 完成了本发明。 本发明的目的是提供一种在 MBSFN和非 MBSFN区域之间的执行越区切换的方法和相应的用户设备， 在用户设备在不同 的通信区域之间移动的情况下， 能够为用户提供连续的 MBMS服务。
在本发明的第一方面， 提出了一种应用于通信网络中的越区切换方法， 该通 ;信网络包括形成 MBSFN区域的第一小区、 未形成 MBSFN区域的第二小区和界于 第一小区和第二小区之间的保留小区， 保留小区隶属于 MBSFN区域， 其中在该 保留小区中广播保留小区指示信息， 该方法包括步骤： 接收保留小区指示信息， 以获知该用户设备处于保留小区中； 测量保留小区中针对预定业务的基于 MBSFN传输的第一信号强度和基于单小区传输的第二信号强度； 以及在所述第 一信号强度与所述第二信号强度的差别小于预定阈值期间， 选择第一小区或者第 二小区作为目标小区。
根据本发明的实施例， 所述 MBSFN传输和单小区传输被复用在同一载波上。 根据本发明的实施例， 所述 MBSFN传输和单小区传输分别在各自的载波上， 所述测量步骤包括： 测量当前载波上的信号强度， 以及在预定的时间段中， 测量 另一载波上的信号强度。
根据本发明的实施例， 所述信号强度可以是业务信道的信号强度， 也可以是 业务信道上参考信号的信号强度。
根据本发明的实施例， 该越区切换方法还包括步骤： 在所述第一信号强度与 所述第二信号强度平衡期间， 基于针对该预定业务的 PDCP的 PDCP SN来选择 MBSFN传输和单小区传输的数据。
根据本发明的实施例， 选择第一小区和第二小区中信号强度髙的那个小区作 为目标小区。
根据本发明的实施例， 所述保留小区指示信息是在 MCCH上广播的。
在本发明的第二方面， 提出了一种用于通信网络中的移动设备， 该通信网络 包括形成 MBSFN区域的第一小区、 未形成 MBSFN区域的第二小区和界于第一小 区和第二小区之间的保留小区， 保留小区隶属于 MBSFN区域， 其中在该保留小 区中广播保留小区指示信息， 该移动设备包括： 收发装置， 接收保留小区指示信 息， 以获知该用户设备处于保留小区中； 测量装置， 测量保留小区中针对预定业 务的基于 MBSFN传输的第一信号强度和基于单小区传输的第二信号强度； 其中， 在所述第一信号强度与所述第二信号强度的差别小于预定阈值期间， 选择第一小 区或者第二小区作为目标小区。
利用本发明的方法和设备， 在用户设备在 MBSFN区域和非 MBSFN区域之间 移动时， 可以向用户提供连续的 MBMS服务。 另外， 由于在用户设备已经深入到 目标基站的覆盖区域之内才进行小区选择， 实现了无缝越区切换。 另外， 在越区 切换的时间段中， 通过 PDCP SN来合并 MBSFN传输的数据和单小区传输的数据， 实现了 MBMS业务数据的无损传输。 附图说明
从下面结合附图的详细描述中， 本发明的上述特征和优点将更明显， 其中： 图 1是说明根据本发明第一实施方式的方法和设备所应用的网络环境的示意 图；
图 2示出了根据本发明第一实施方式的用户设备的结构框图；
图 3示出了如图 2所示的 MBMS数据提取单元的工作过程的示意图； 图 4示出了根据本发明第一实施方式的越区切换方法的执行过程的示意图； 图 5是说明根据本发明第二实施方式的方法和设备所应用的网络环境的示意 图； 以及
图 6示出了根据本发明第二实施方式的用户设备的结构框图,。 具体实施方式
下面， 参考附图详细说明: 发明的优选实施方式。 在附图中， 虽然示于不同 的附图中， 但相同的附图标记用于表示相同的或相似的组件。 为了清楚和简明， 包含在这里的已知的功能和结构的详细描述将被省略， 否则它们将使本发明的主 题不清楚。
【第一实施方式】
图 1是说明根据本发明第一实施方式的方法和设备所应用的网络环境的示意 图。
如图 1所示， 根据本发明第一实施方式， MBMS业务和单播业务复用在同一 载波上。 换言之， 在载波上既传输 MBMS业务， 也传输单播业务。
通常， 传播相同 MBMS业务的小区形成了 MBSFN,其中针对用户的某项服务 在 MBSFN中的各个小区中同时传输。 因此， 在 MBSFN中， 相同业务的信号的物 理叠加使得用户设备 10可以在 MBSFN区域中不进行任何切换地接收信号。
如图 1所示， 在 MBSFN区域的外层， 为了防止来自其他非 MBSFN区域中小区 的发射信号的干扰， 存在一圈保留小区。 在保留小区中， 基站在其 MCCH信道上 广播保留小区指示信息， 以向进入该小区的用户设备通知其所在的小区是保留小 区， 也就是处于 MBSFN区域和非 MBSFN区域之间的边界附近。
另外， 在保留小区中， 基站在载波上既传输 MBMS业务数据， 也传输单播业 务数据。 这样， 如果某项业务， 例如移动电视节目， 在用户设备从 MBSFN区域 移动到非 MBSFN区域的过程中， 可以在保留区域中实现越区切换， 而不会造成 该移动电视节目的中断。
图 2示出了根据本发明第一实施方式的用户设备的结构框图。 如图 2所示， 根 据本发明第一实施方式的用户设备包括： 收发单元 11， 用于从承载了 MBMS业务 和单播业务的载波上接收用户想要接收的业务信号； 控制单元 12; 信号强度测量 单元 13 , 用于在控制单元 12的控制下， 测量收发单元 11所接收的针对同一业务的 两种信号的强度， 其中由控制单元 12将接收的两种信号的强度与预定的阈值进行 比较， 并且根据比较结果进行小区选择， 也就是越区切换； MBMS数据提取单元 14， 用于在进行越区切换的一段时间内选择来自不同小区的业务数据， 并且根据 PDCP SN对这些数据进行合并； 和呈现单充 15， 对 MBMS数据合并单元 14所得到 的 MBMS业务数据进行处理并呈现给用户。
如上所述， 当用户设备 10从 MBMS传输小区进入保留小区时， 在通过收发单 元 11从保留小区的 MCCH信道上接收到保留小区指示信息后， 控制单元 12指示收 发单元 11立即针对 MBSFN区域和单小区传输区域读取整个 MCCH上的信息。
如果该保留小区同时也在单小区传输模式下传输该业务， 例如移动电视节 目， 控制单元 12可以根据载波上针对同一业务的两种信号的强度在适当的时机进 行越区切换。 这里的信号强度可以是业务信道上的信号强度或者业务信道上的参 考信号的强度。
例如， 控制单元 12命令信号强度测量单元 13测量载波上针对同一业务的不同 信号强度， 并且判断二者之差的绝对值是否小于预定的阈值。 在满足上述阈值的 情况下的一段时间内， 收发单元 11既接收来自多小区传输的业务信号， 也接收来 自单小区传输的业务信号。 在两种信号的强度达到平衡的时候， 控制单元 12命令 收发单元 11进行小区选择， 也就是选择信号强度高的那个小区。
由于在单小区传输的信号强度高于多小区传输的信号强度预定的时间内， 进 行切换，所以能够保证越区切换是无缝的。但是， 如果该小区并未发送该项服务， 控制单元 12通过收发单元 11在该载波中建立起与基站的 RRC连接， 以便触发针对 该项业务的单小区 MBMS传输， 但是并不立即执行越区切换， 其后的过程与上述 越区切换过程一致。
但是， 也有可能用户设备 10再次返回到 MSFN传输小区， 而不触发 RRC连接 来终止 MBMS单小区传输。 在这种情况下， 基站或者网络可以执行周期的轮询来 判断在保留小区中是否存在用户设备， 进而停止 MBMS单小区传输。
由于用户设备可以同时接收 MBMS信号和单小区信号， 这种最优化的越区切 换机制可以获得 UE无损移动性的优点。 如图 3所示， PDCP (分组数据汇聚协议） 层是 EMBMS GW (EMBMS网关） 中共有的层， 并且 MBSFN小区和单小区传输 相同的 PDCP SDU (业务数据单元）。 因此， 当该移动电视节目基于 PDCP SN (序 列号） 以 PDCP的形式发送出去的时候， 用户设备 10中的 MBMS数据提取单元 14 可以执行选择性的合并来在不同的状况下提供 MBMS服务， 而不会产生分组传输 损失。
如图 3所示， 从 EMBMS GW传输针对某项业务的 PDCP SDU。 由于对于用户设备 来说， MBSFN区域 （多小区传输） 和保留小区 （单小区传输） 是透明的， 因此 在用户设备 10的 PDCP层， MBMS数据提取单元 14根据针对该项业务的 PDCP SN 来选择性地合并 PDCP 数据， 形成针对该移动电视节目的数据流。 进而， 呈现单 元 15， 对获得的数据流进行处理， 并呈现给用户。
下面描述保留区域到 MBSFN区域越区切换过程。 如上所述， 混合小区， 也 就是] 1BMS保留小区， 不仅在 MCCH上广播其自身的控制信息， 而且广播 MBSFN 中多小区传输的配置信息。 一旦用户设备 10从单播小区进入保留小区， 用户设备 10就可以接收到单小区传输的控制信息和多小区传输的控制信息。 然后， 用户设 备 10继续进行来自两个无线电信源的服务接收， 并且基于 PDCP来合并所接收到 的分组。 这一过程与上述的类似， 区别在于从单小区传输切换到多小区传输， 也 就是 MBSFN区域的传输。 图 4示出了根据本发明第一实施方式的越区切换方法的执行过程的示意图。 如图 4所示， 在靠近 MBSFN区域中传输小区的边界处， 用户设备 10可以接收从 MBSFN区域泄漏的信号， 并不需要立即执行越区切换， 尽管单小区传输正在进 行中。 因此， 当用户设备 10已经进入到保留小区中比较远的一段距离时， 例如达 到如图 3所示的小区半径的 3/4时， 执行越区切换。 或者， 在用户设备 10的信号测 量单元 13所测量的两种信号强度的差值小于预定阈值的一段时间内， 控制单元 12 命令收发单元 11选择信号强度高的一个小区，完成越区切换。但是在该段时间内， 如上所述， MBMS数据提取单元 14选择来自两个无线电信源的信号， 提取针对该 移动电视节目的 PDCP数据， 并进行合并。
选择在该时间段中进行切换的原因在于， 服务信号的功率在越区切换之前和 之后区别不大， 或者小于预定的阈值。 这样可以保证是供给用户的 MBMS服务的 连续性。
【第二实施方式】
上面描述的第- 实施方式针对的是 MBMS业务与单播业务复用在同一载波 上的情况。 但是， MBMS业务可以拥有专用的载波， 也就是 MBMS业务在专用载 波上进行传输， 而单播业务或者其他业务 （如 MBMS单小区传输） 复用在另一载 波上。
图 5是说明根据本发明第二实施方式的方法和设备所应用的网络环境的示意 图。 如图 5所示， 由于 MBSFN区域中 MBMS业务采用专用载波来传输， 而其他的 业务利用另一载波来传输， 这构成了分层的网络结构。 如图 5所示， MBSFN区域 中的小区利用专用载波来传输某项 MBMS业务， 例如移动电视节目。 同时， 在另 一载波上也可以传输该移动电视节目， 采用的是单小区方式但是覆盖不同。 因此 对于用户设备 20来说， 蜂窝网络是分层的， 它既可以在 MBSFN区域中接收该移 动电视节目， 也可以在单小区传输区域中接收该移动电视节目。 由于存在两种不 同的载波， 需要用户设备 20基于异频测量 （Inter-frequency measurement) 来进行 越区切换。
在专用载波和混合载波之间进行越区切换需要用户设备 20在不连续接收期 间 （DRX) 或者在相应的时隙中进行异频测量。 另外， 在保留小区的 MCCH上广 播保留保留小区指示信息， 用于向用户设备 20指示其所在的小区是保留小区。 当 用户设备 20进入到保留小区中时， 它读取该 MCCH上的信息。 这有助于触发对目 标小区的异频测量， 并且触发其自身和网络准备进行 MBMS服务切换。 因此， 这 减少了用户设备的服务连续中断时间。
图 6示出了根据本发明第二实施方式的用户设备的结构框图。 如图 6所示， 根 据本发明第二实施方式的用户设备包括： 收发单元 21， 包括在专用载波上收发信 号的第一收发单元 11A和在另一载波上收发信号的第二收发单元 11B ; 控制单元 22; 信号强度测量单元 23， 用于在控制单元 22的控制下， 测量当前载波上的信号 强度，.并且在 DRX期间测量另一载波上的信号强度， 其中由控制单元 12将接收的 两种信号的强度与预定的阈值进行比较， 并且根据比较结果进行小区选择， 也就 是越区切换； MBMS数据提取单元 24， 用于在进行越区切换的之前和之后选择来 自不同小区的业务数据，并且根据 PDCP SN对这些数据进行合并；和呈现单元 25， 对 MBMS数据提取单元 24所得到的 MBMS业务数据进行处理并呈现给用户。
当用户设备 20从 MBMS传输小区进入到保留小区中时， 在从 MCCH信道接收 到保留小区指示信息之后， 控制单元 22触发异频测量动作， 由信号强度测量单元 23测量当前载波上的信号强度和另一载波上的信号强度。 然后， 控制单元 22比较 服务小区和相邻小区的异频测量结果， 以便确定接收条件较好的小区。 用户设备 20可以在异频测量期间中自动地接收相邻小区的 MCCH。 如果相邻小区正在传输 该服务， UE在适当的时机进行小区选择。例如， 单小区信号强度高于多小区信号 强度预定时间之后， 执行越区切换。 但是， 如果该小区并未传输该服务， 控制单 元 22通过第二收发单元 11B在混合载波中建立起 RRC连接， 以便触发 MBMS传输， 这是因为在专用载波中不存在上行链路。
下面描述与上述相反的切换过程。 当用户设备 20进入到与 MBSFN区域中的 小区具有重叠区域的混合小区中时， 该混合小区 MCCH中， 基站不但要广播自身 的控制信息， 而且广播 MBSFN中目标小区的载波频率和 MCCH配置信息。用户设 备 20中的第一收发单元 11A检测目标小区中的 MCCH， 并且由信号强度测量单元 23测量该专用信道上的信号强度， 由控制单元 22与阈值进行比较以进行小区选 择， 也就是越区切换。
上面的描述仅用于实现本发明的实施方式， 本领域的技术人员应该理解， 在 不脱离本发明的范围的任何修改或局部替换， 均应该属于本发明的权利要求来限 定的范围， 因此， 本发明的保护范围应该以权利要求书的保护范围为准。

Claims

权利要求
1、 一种应用于通信网络中的越区切换方法， 该通信网络包括形成 MBSFN 区域的第一小区、 未形成 MBSFN区域的第二小区和界于第一小区和第二小区之 间的保留小区， 保留小区隶属于 MBSFN区域， 其中在该保留小区中广播保留小 区指示信息， 该方法包括步骤- 接收保留小区指示信息， 以获知该用户设备处于保留小区中；
测量保留小区中针对预定业务的基于 MBSFN传输的第一信号强度和基于单 小区传输的第二信号强度； 以及
在所述第一信号强度与所述第二信号强度的差别小于预定阈值期间， 选择 第一小区或者第二小区作为目标小区。
2、 如权利要求 1所述的越区切换方法， 其中， 所述 MBSFN传输和单小区传 输被复用在同一载波上。
3、 如权利要求 1所述的越区切换方法， 其中所述 MBSFN传输和单小区传输 分别在各自的载波上， 所述测量步骤包括- 测量当前载波上的信号强度， 以及
在预定的时间段中， 测量另一载波上的信号强度。 ，
4、 如权利要求 1所述的越区切换方法， 其中， 所述信号强度是业务信道的 信号强度。
5、 如权利要求 1所述的越区切换方法， 其中， 所述信号强度是是业务信道 上参考信号的信号强度。
6、 如权利要求 2所述的越区切换方法， 还包括步骤：
在所述第一信号强度与所述第二信号强度平衡期间， 基于针对该预定业务 的 PDCP的 PDCP SN来选择 MBSFN传输和单小区传输的数据。
7、 如权利要求 1所述的越区切换方法， 其中选择第一小区和第二小区中信 号强度高的那个小区作为目标小区。
8、 如权利要求 1所述的越区切换方法， 其中， 所述保留小区指示信息是在 MCCH上广播的。
9、 如权利要求 2所述的越区切换方法， 还包括： 若所述保留小区并未发送 该项业务， 则在该保留小区中发起与基站的 RRC连接， 建立起所述预定业务的单 小区传输。
10、 一种用于通信网络中的用户设备， 该通信网络包括形成 MBSFN区域的 第一小区、 未形成 MBSFN区域的第二小区和界于第一小区和第二小区之间的保 留小区， 保留小区隶属于 MBSFN区域， 其中在该保留小区中广播保留小区指示 信息， 该用户设备包括：
收发装置， 接收保留小区指示信息， 以获知该用户设备处于保留小区中； 测量装置， 测量保留小区中针对预定业务的基于 MBSFN传输的第一信号强 度和基于单小区传输的第二信号强度；
其中， 在所述第一信号强度与所述第二信号强度的差别小于预定阈值期间， 选择第一小区或者第二小区作为目标小区。 .-
11、 如权利要求 10所述的用户设备， 其中， 所述 MBSFN传输和单小区传输 被复用在同一载波上。
12、 如权利要求 10所述的用户设备， 其中所述 MBSFN传输和单小区传输分 别在各自的载波上， 所述测量装置测量当前载波上的信号强度， 并且在预定的时 间段中， 测量另一载波上的信号强度。
13、 如权利要求 10所述的用户设备， 其中， 所述信号强度是业务信道的信 号强度。 .
14、 如权利要求 10所述的用户设备， 其中， 所述信号强度是是业务信道上 参考信号的信号强度。
15、 如权利要求 11所述的用户设备， 还包括：
提取装置， 在所述第一信号强度与所述第二信号强度平衡期间， 基于针对 该预定业务的 PDCP的 PDCP SN来选择 MBSFN传输和单小区传输的数据。
16、 如权利要求 11所述的用户设备， 其中， 若所述保留小区并未发送该项 业务， 则在该保留小区中发起与基站的 RRC连接， 建立起所述预定业务的单小区 传输。
17、 如权利要求 10所述的用户设备， 其中选择第一小区和第二小区中信号 强度高的那个小区作为目标小区。
18、如权利要求 10所述的用户设备，其中，所述保留小区指示信息是在 MCCH 上广播的。
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