201234888 六、發明說明： 【發明所屬之技術領域】 本發明係關於無線通信網路，尤其關於一種在無線通 信網路的基地台中用於切換多媒體廣播多播服務（MB MS )服務的用戶終端的方法。 向用 式使 方效 效高 高指 以是 於其 在尤 務裏 任這 的在 性效 戰高 挑。 有務 項服 _ 體 的媒 中多 1 信供 術通提 技動戶 前移用 先 線 [ ^ 分配給網路的稀缺和昂貴的無線網路資源（如頻帶），從 而可以在無線電頻帶內並行服務於盡可能多的用戶和盡可 能不同的服務。儘管現有第二代無線網路以高效方式支援 語音服務，但是第三代無線系統和基於分組的無線網路的 目標在於以最高效方式爲資料通信和分發提供最優服務》 透過根據服務類型來使用單播或者廣播/多播傳輸技 術，可以最佳化網路容量和投資。當需要從一個來源向大 量接收器並行提供（多媒體）資料時可應用廣播/多播技 術。當需要在不同通信實體之間交換資料時或者當需要向 一個或者少量接收器分發資料（例如點播的多媒體內容） 時可應用單播技術。 設想的傳輸模式之一利用所謂的SFN (單頻網路）操 作，其中組播廣播單頻網（MBMS SFN，MBSFN )區域內 的所有小區使用相同無線電資源以同步方式傳輸相同內容 ，從而有可能讓進行接收的用戶終端在物理層上組合所接 -5- 201234888 收的信號。這要求針對MB MS用戶服務的每個會話在所有 小區中以相同方式配置無線電資源（例如無線資源塊、 TTI、…）和物理層參數（例如MCS、調製和編碼方案） 。此處’可以使用多小區/多播協調實體（MCE)。這樣 的MCE可以控制屬於一個或者多個eNB (基地台）的小 區。然而’如果以SFN區域超過由單個MCE控制的區域 這樣的方式選擇該SFN區域，則要求在這些MCE之間的 協調。 當然，當正在接收一個或多個MBMS的用戶終端，因 爲用戶終端的移動或者其他原因而在基地台一方發生小區 切換時，較爲理想的狀態應當是，該用戶終端所接收的一 個或多個MB MS保持良好的服務連續性。 【發明內容】 然而，在實驗過程中發現，當正在接收一個或多個 MB MS的用戶終端，在其所歸屬的基地台控制下發生切換 過程時，上述用戶終端所接收的一個或多個MBMS往往會 無法繼續。 基於上述發現，加之以進一步的分析可得，一部分的 MBMS接收用戶在切換過程中無法保持服務連續性的原因 經常在於，所切換的目標小區所支援的一個或多個MBMS 與源小區所支援的一個或多個MBMS並不完全相同，甚至 所切換的目標小區所支援的Μ B M S往往會少於源小區所支 援的MBMS，或是目標小區根本就不支援MBMS服務發送 201234888 因此，如果能夠提供一種在無線通信網路的基地台中 用於控制切換用戶終端的方法，從而使得被切換的用戶終 端能最大限度地保持其所接收的MBMS的服務連續性，不 失爲一種有益的方案。 根據本發明的一個實施例，提供了一種在無線通信網 路的基地台中用於切換用戶終端的方法，用戶終端所在的 源小區爲基地台所轄並具有至少一個相鄰小區，用戶終端 用於接收第一多媒體廣播多播服務集，方法包括： A.確定至少一個相鄰小區中的第一相鄰小區所對應 的至少一個組播廣播單頻網區域； B ·根據至少一個組播廣播單頻網區域分別所支援的 多媒體廣播多播服務，確定第一小區所支援的第二多媒體 廣播多播服務集； C.在至少一個相鄰小區中，如果對於第一相鄰小區 ，第一多媒體廣播多播服務集與第二多媒體廣播多播服務 集之間具有最大交集，則將第一相鄰小區確定爲切換目標 小區。 根據本發明的另一個實施例，提供了一種在無線通信 網路的基地台中用於切換用戶終端的裝置，用戶終端所在 的源小區爲基地台所轄並具有至少一個相鄰小區，用戶終 端用於接收第一多媒體廣播多播服務集，裝置包括： -組播廣播單頻網區域確定裝置，用於確定至少一個 相鄰小區中的第一相鄰小區所對應的至少一個組播廣播單 201234888 頻網區域； -第—多媒體廣播多播服務集確定裝置，用於根據至 少一個組播廣播單頻網區域分別所支援的多媒體廣播多播 服務，確定第一小區所支援的第二多媒體廣播多播服務集 1 -切換目標小區確定裝置，用於在至少一個相鄰小區 中’如果對於第一相鄰小區，第一多媒體廣播多播服務集 與第二多媒體廣播多播服務集之間具有最大交集，則將第 一相鄰小區確定爲切換目標小區。 其中，第一多媒體廣播多播服務集爲用戶終端在源小 區中正在接收或能夠接收到的一個或者多個MBMS服務的 集合，而第二多媒體廣播多播服務集爲用戶終端在可以被 作爲切換候選小區的第一小區中可以接收的一個或者多個 MBMS服務的集合。 在上述技術方案中，第一相鄰小區爲用戶終端所在的 源小區的至少一個相鄰小區之一，透過至少一個組播廣播 單頻網區域確定步驟，可以得到覆蓋該第一相鄰小區的至 少一個組播廣播單頻網區域；從而進一步確定該第一小區 所支援的第二多媒體廣播多播服務集，對於用戶終端所在 的源小區的至少一個相鄰小區，如果僅包括一個小區，即 第一相鄰小區，則可直接將用戶終端切換至該第一相鄰小 區；如果包括多個小區，則透過比較，如果該第一相鄰小 區中可接收的第二多媒體廣播多播服務集與上述第一多媒 體廣播多播服務集之間的交集在所有的相鄰小區中最大’ -8- 201234888 則將用戶終端切換至該第一相鄰小區。如果該第—相鄰小 區所對應的上述交集並非最大，則可重複執行本方案的步 驟，直至確定出上述交集最大的—個相鄰小區’再將用戶 終端切換至該具有最大的上述交集的相鄰小區中。因而， 透過上述步驟，可以保證，在所有相鄰小區中，用戶終端 始終可被切換至一個具有最大的上述交集的小區中，從而 使其所接收的MBMS服務保持最大程度的連續性。 在附圖中，相同和相似的附圖標記代表相同或相似的 裝置或方法步驟。 【實施方式】 圖1示出了根據本發明的一個實施例的在無線通信網 路的基地台11中用於切換MB MS用戶終端的方法流程圖 。用戶終端所在的源小區爲基地台所轄並具有至少一個相 鄰小區，例如 NCell_l，NCell_2，NCell_3，NCell_4，而 用戶終端用於接收第一多媒體廣播多播服務集，例如 {MBMS_Service_l - MB M S _S ervi c e_3 > Μ B M S _ S e r v i c e_4 } ，如圖所示，該方法包括步驟Sll，S12以及S13。 在步驟S 1 1中，基地台丨1確定至少一個相鄰小區中 的第一相鄰小區’例如NCell_2，所對應的至少一個組播 廣播單頻網區域。 在步驟S 12中’基地台π根據至少一個組播廣播單 頻網區域分別所支援的多媒體廣播多播服務，確定第一小 區所支援的第二多媒體廣播多播服務集； -9- 201234888 在步驟S 1 3中，基地台1 1在至少一個相鄰小區中， 如果對於第一相鄰小區NCell_2 ’第一多媒體廣播多播服 務集（例如 MBMS_Service_l ， MBMS —Service_3 ， MBMS_Service_4)與第二多媒體廣播多播服務集之間具 有最大交集，則將第一相鄰小區NCell_2確定爲切換目標 小區。 其中，第一多媒體廣播多播服務集（例如 MBMS Service 1 1 MBMS Service 3 > MBMS Service 4) —— _ — — — — 爲用戶終端在源小區中正在接收或能夠接收到的一個或者 多個MBMS服務的集合，而第二多媒體廣播多播服務集爲 用戶終端在可以被作爲切換候選小區的第一小區中可以接 收的一個或者多個MBMS服務的集合。 在一些實施例中，上述的可以被基地台1 1作爲用戶 終端的切換候選小區的至少一個相鄰小區，較佳地，是滿 足來自用戶終端的切換測量上報準則的。對應地，上述方 法還可以包括步驟：基於來自用戶終端的切換測量上報準 則，確定至少一個相鄰小區。 在一些實施例中，如果第一相鄰小區NCell_2爲基地 台1 1所轄的小區，則可選地，在步驟S1 1中，可以直接 透過M2介面應用協定的M2介面建立過程，從多小區組 播協調實體20獲取該第一相鄰小區NCell_2所對應的至 少一個組播廣播單頻網區域，例如 MBSFN_Area_l和 MBSFN_Area —2 0 而在另一些實施例中，如果第一相鄰小區NCell_2爲 -10- 201234888 第二基地台1 2所轄，則在步驟S 1 1中，可以從多小區組 播協調實體獲取第一相鄰小區NCell_2所對應的至少一個 組播廣播單頻網區域（例如 MBSFN_Area_l 和 MBSFN_Area_2 )的指示資訊。 可選地，可以考慮將所有網路中所有基地台所轄的所 有小區分別對應的MBSFN資訊不再集中地儲存到多小區 組播協調實體20之中，而是可以共用地儲存至各個基地 台之中，並即時更新，此時，可選地，在步驟S11中，可 以在多小區組播協調實體20和基地台1 1之間同步操作與 管理配置（0&M )資訊，該操作與管理配置資訊可以包括 第一相鄰小區NCell_2所對應的至少一個組播廣播單頻網 區域（例如MBSFN_Area_l和MBSFN_Area_2)的指示資 訊，或者較佳地，還可以包括用戶終端所在的源小區與至 少一個相鄰小區之間的鄰接關係。則透過這個步驟，基地 台1 1可以從多小區組播協調實體20獲得上述第一相鄰小 區NCell_2的對應的一個或多個MBSFN資訊。 可替代地，在另一個實施例中，步驟S11也可以透過 向多小區組播協調實體MCE 20發請求訊息，從而從第二 基地台1 2的對該訊息的回應中獲取所請求的至少一個組 播廣播單頻網區域（例如 MBSFN_Area_l 和 MBSFN_Area_2 )，具體地，步驟S 1 1可以進一步包括“ 發送至少一個組播廣播單頻網區域的指示資訊的更新請求 至多小區組播協調實體”的子步驟以及“根據更新請求的 回應，確定至少一個組播廣播單頻網區域”的子步驟。 -11 - 201234888 圖2示出了根據本發明的另一個實施例的在無線通信 網路的基地台中用於切換MBMS用戶終端的方法的組播廣 播單頻網區域確定子步驟的流程圖。在該實施例中，“發 送至少一個組播廣播單頻網區域的指示資訊的更新請求至 多小區組播協調實體”的子步驟，具體地，可以進一步包 括步驟S 1 1 1 1和s 1 1 1 2。 在步驟S1111中，基地台11發送至少一個組播廣播 單頻網區域的指示資訊的更新請求至多小區組播協調實體 20。其中的至少一個組播廣播單頻網區域與作爲切換候選 小區的第一相鄰小區NCel 1_2相對應。 在步驟S 1 1 1 2中，基地台1 1根據來自多小區組播協 調實體20的更新請求的回應訊息，確定至少一個組播廣 播單頻網區域，例如，可以爲 MBSFN_Area_l 和 MBSFN_Area_2。 具體地，步驟S 1 1 1 1中所發送的“至少一個組播廣播 單頻網區域的指示資訊的更新請求”可以基於現有的M2 介面應用協定過程，即在M2介面應用協定中的現有訊息 的基礎上爲MBSFN區域增加一個“更新請求域”，則在 步驟S1111中，基地台11可以進一步地透過M2介面應 用協定，向多小區組播協調實體發送M2介面配置更新訊 息’該配置更新訊息包括至少一個組播廣播單頻網區域的 指示資訊的更新請求。對應地，在步驟S1112中，基地台 1 1可以進一步地根據多小區組播協調實體對M2介面配置 更新訊息的回應，確定至少一個組播廣播單頻網區域。 -12- 201234888 上述實施例中的M2介面配置更新訊息及其回應訊息 可以採用例如但不限於如下表1所示的訊息格式，該訊息 由eNB 1 1發送至多小區組播協調實體MCE 20，用以表示 在eNB 11中的應用層配置資料已經改變。 表 1 : M2 介面配置更新（“ENB CONFIGURATION UPDATE)訊息（ eNB 11->MCE 20) (Presence) 範圍(Range) type and reference) (Criticality) 度 (Assigned Criticality) 訊i麵 Μ 9.2.1.1 YES 麵 全局eNB ID 0 9.2.1.10 YES 攤 eNB名稱 0 可列印字串 (1..150,…） YES 忽胳 制、區的eNB MBMS 配 0..1 YES 拒絕 >eNB MBMS 配置 資 Μ目目 1 to <maxnoofCells> EACH 拒絕 »MUeNBID Μ »>eNB MBMS 配 置艱項目目 9.2.1.12 »>E-UTRANCGI 9.2.1,11 》> 麵相鄰小區 歹赚訊元 1 to <maxnoofIntraFreqNCell> EACH 忽略 »»EUTRAN CGI Μ 9.2.1.11 - - 》> 同頻相、區 列表資訊元 1 to <maxnoofInterFreqNCell> EACH 忽路 »»EUTRAN CGI Μ 9.2.1.11 - - 其中，異頻相鄰小區列表資訊元，同頻相鄰小區列表 資訊元及其各自對應的“EUTRAN CGI”爲在訊息中新定 義的資訊元。上述表1中的一些專案的含義如下所示： -13- 201234888 取値範圍 描述 maxnoofCells 被一個eNB所服務的小區的最大數量。該値爲256. maxnooflntraFreqNCell 異頻相鄰/j、區的最大數量。maxn〇〇flntraFreqNCeli的値爲16_ maxnooflnterFreqNCell 異頻相鄰小區的最大數量。maxno〇flntraFreqNCell的値爲16. 對應地，在M2介面配置更新回應（CONFIGURATION UPDATE ACKNOWLEDGE)訊息中，MCE 20 需要將 eNB 11所請求的同頻/異頻的MBSFN區域的id資訊反饋至 eNB 1 1 —方。 鑒於現行的 M2 介面配置更新回應（ENB CONFIGURATION UPDATE ACKNOWLEDGE )訊息。在 本發明的實施例中，可以增加相鄰小區的 MSBFN區域 資訊作爲"ENB CONFIGURATION UPDATE ACKNOWLEDGE ”訊息中的資訊元“MCCH related BCCH Configuration Item”的一部分。這樣，則需要定義一個“NCell MBSFN Area Info Item”的新資訊元素β 在本實施例中，對於資訊元“MCCH related BCCH Configuration Item”的具體的改動可以例如但不限於如表 2所示： -14- 201234888 表1向基地台/eNB 11提供與MCCH相關的BCCH配置資訊的資訊元 資訊元(IE)名稱 雜與否 (Presence) 範圍(Range) 資訊元麵或出處(IE type and reference) MBSFN區域標識 Μ 9.2.1.14 PDCCH長度 Μ 枚舉型(s]，s2,…） 重復周期 Μ 枚舉型（rf32，rf64，rfl28， rf256) 偏移 Μ 罄 ®(o..io) 修改周期 Μ 枚舉型(rf512，rfl024) 子幀位置資訊 Μ 位符串(SIZE(6)) 調製編碼方案 Μ 枚舉型(n2，n7，nl3,nl9) 小區資訊列表 0..1 >小區資訊 1 to <maxnoofCells> »E-UTRAN CGI Μ 9.2.1.11 »小區保留資訊 Μ 枚舉型(reservedCell， nonReservedCell，…） »>同頻相鄰小區 1 to MBSFN區域資訊列表 » <maxnooflntraFreqNCell> »>相鄰小區 MBSFN區域資訊專 案 Μ 9.2.1.x >》異頻相鄰小區 1 to MBSFN區域資訊列表 <maxnoofInterFreqNCell> >»相鄰小區 MBSFN區域資訊專 案 Μ 9.2.1.x 其中，“異頻相鄰小區MB S FN區域資訊列表”，“ 同頻相鄰小區MB SFN區域資訊列表”及其各自對應的“ 相鄰小區MBSFN區域資訊專案”爲在訊息中新定義的資 訊元。 具體地，新增加的資訊元定義 “NCell MBSFN Area Info Item”可以以例如但不限於下述表3所給出的形式存 在。該“NCell MBSFN Area Info Item”資訊元提供了相鄰 小區的MBSFN區域的id資訊。 -15- 201234888 表 3 : NCell MBSFN Area Info Item 資訊元（IE)名稱 雜與否 (Presence) 範圍(Range) 資訊元類型 或出處(IE type and reference) 語義描述(Semantics description) EUTRAN CGI M 9.2.1.11 MBSFN Area Id List 1 to <maxnoofMB SFNArea> > MBSFN Area Id M 9.2.1.14 取値範圍 描述 maxnoofMBSFNArea 可在本^J、區中被重疊覆蓋的MBSFN區域的最大數量。此處 maxnoofMBSFNArea 取値爲 8. 作爲另一種備選的替代方法，在本發明的另一實施例 中，在步驟S 1 1 1 1中所發送的“至少一個組播廣播單頻網 區域的指示資訊的更新請求”可以透過在現有的M2介面 中新定義訊息介面實現，即在步驟S 1 1 1 1中，基地台11 可以向多小區組播協調實體發送基地台的多媒體廣播組播 配置資訊請求訊息，該配置資訊請求訊息爲M2介面應用 協定的新增訊息，並包括至少一個組播廣播單頻網區域的 指示資訊的更新請求。對應地，在步驟S 1 1 1 2中，基地台 1 1可以根據多小區組播協調實體對配置資訊請求訊息的回 應，確定至少一個組播廣播單頻網區域。 此處，本領域技術人員應當理解，上述的在M2介面 應用協定中新定義的用於基地台11向MCE 20請求相鄰小 區的MBSFN區域指示資訊的訊息及其回應訊息，其具體 形式可以參照上述表1〜表3中的資訊元定義的形式進行定 義。其具體的定義形式並不構成對本發明的限制。 -16- 201234888 當然，本領域技術人員應當理解：步驟s 1 1的“從多 小區組播協調實體獲取至少一個組播廣播單頻網區域的指 示資訊”的子步驟，不限於上述透過“發送至少一個組播 廣播單頻網區域的指示資訊的更新請求”從而根據多小區 組播協調實體MCE 20對於該請求的回應獲取至少一個組 播廣播單頻網區域的指示資訊，當然，也可以進一步包括 其他形式的獲取子步驟，例如，M C E 2 0可以周期性地主 動發送包括第一相鄰小區NCel 1_2所對應的至少一個組播 廣播單頻網區域的指示資訊的訊息，對應地，第一基地台 1 1 一方透過資訊周期性地接收該訊息，從而獲取上述的至 少一個組播廣播單頻網區域的指示資訊。 可替代地，在本發明的另一實施例中，基地台11不 僅可以從MCE 20 —方，而且還可以從第二基地台12 —方 獲取第一相鄰小區N C e 11 _2所對應的至少一個組播廣播單 頻網區域的資訊。 圖3示出了根據本發明的又一實施例的在無線通信網 路的基地台中用於切換MBMS用戶終端的方法的組播廣播 單頻網區域確定子步驟的流程圖。其中，包括X2介面建 立請求訊息發送步驟S1 121以及X2介面建立回應訊息接 收步驟S 1 1 2 2。 在上述步驟S1121和S1122中，利用了 X2介面建立 過程用以在包括基地台11以及第二基地台12在內的網路 中的多個基地台之間交換各個基地台分別所轄的小區所對 應的MBSFN子幀資訊，因此，本發明的實施例，在該X2 -17- 201234888 介面建立過程中進行基地台以及第二基地台12各自 所轄的小區的MBSFN區域指示資訊的交換。即，在步驟 S1122中’基地台11透過X2介面應用協定，接收來自第 二基地台的X2介面建立請求訊息’或者反之，在步驟 S1121中，基地台11可以向第二基地台發送X2介面建立 請求訊息而在步驟S11U中接收來自第二基地台的X2介 面建立回應訊息，上述的X2介面建立請求訊息或χ2介 面建立回應訊息各自均包括了第二基地台12對應的至少 —個小區的組播廣播單頻網區域（例如MBSFN_Area_l和 MBSFN_Area_2 )的指示資訊。 當然，可選地，基地台11也可以透過X2介面應用協 定，接收來自第二基地台12的“ eNB配置更新訊息”， 或者向第二基地台12發送“eNB配置更新訊息”而接收 來自第二基地台1 2的“ eN B配置更新訊息”的回應訊息 ，上述的配置更新訊息及其回應訊息均包括第二基地台12 所轄的至少一個小區的組播廣播單頻網區域（例如 MBSFN_Area_l和 MB S FN_ Area_2 )的指示資訊的資訊元 〇 根據現有的X2AP信號中的X2建立請求（X2 SETUP REQUEST )，X2 建立回應（X2 SETUP RESPONSE )以及 基地台配置更新（ENB CONFIGURATION UPDATE )訊 息的定義，可以在本發明的某些實施例中，對上述信號訊 息中針對網路中的每個基地台1 1所轄的小區，在“Served Cell Information”的定義中增力□ MBSFN區域資訊，當然， -18- 201234888 此處，較佳地，信號的訊息的改進是以 T S 3 6.4 2 3 V 9.4.0 版本的信號/訊息的形式爲基準進行的。而具體所增加的 例如“MBSFN區域指示”資訊元的格式與上述表1〜3中 的更改格式可以相同，也可以不同，此處不再贅述，但對 信號/訊息的格式的具體的更改形式，並不對本發明構成 限制。 此處，假定用戶終端可接收的MBMS集及其對應的 MB SNF區域如下表4所示： 用戶終端可接收的MBMS 服務 MBMS服務各自所對應的 MBSNF區域 MBMS Servicel MBSFN Area 1 MBMS Service 3 MBSFN Area 1 MBMS Service 4 MBSMF Area 2 同時假定源小區的所有的相鄰小區所對應的MBS FN 區域標識資訊如下表5所示： 異頻相鄰小區 相鄰小區所對應MBSFN 區域的Id NCelll MBSFN Area 1 NCell2 MBSFN Area 1 MBSFN Area 2 NCelB MBSFN Area 3 NCell4 MBSFN Area 2 透過用戶終端的切換測量上報準則的判定，該第一相 鄰小區NCell2，可以作爲用戶終端的候選切換小區。則經 -19- 201234888 過上述實施例中的步驟，基地台1 1可以獲得源小區的一 個相鄰小區，例如第一相鄰小區NCell2，的組播廣播單頻 網區域（例如MBSFN_Area_l和MBSFN_Area_2)的指示 資訊》而在步驟S12中，基地台11可以根據上述組播廣 播單頻網區域MBSFN_Area_l和MBSFN_Area_2分別所支 援的多媒體廣播多播服務的資訊，確定第一相鄰小區 NCel 12所支援的第二多媒體廣播多播服務集。例如，假定 MBSFN_Area_l所支援的多媒體廣播多播服務爲 MBMS_Service_l，MBMS_Service_3，而 Μ B S FN _ A r e a — 2 所支援的多媒體廣播多播服務爲MBMS_ServiCe_4，則基 地台1 1可以確定第一相鄰小區NC ell 2所支援的第二多媒 體廣播多播服務集爲{MBMS_Service_l，MBMS_Service_3 ，MBMS_Service_4}，貝(J 在相鄰小區 NCelll，NCell2， NCell3，NCell4中，對於第一相鄰小區NCell2，第一多媒 體廣播多播服務集{MBMS_Service_l ’ MBMS_Service_3， MBMS_Service_4}與第二多媒體廣播多播服務集 {MBMS_Service_l，MBMS_Service_3 ’ MBMS_Service_4} 之間具有最大交集，此處兩個集合完全重合，則可以將第 一相鄰小區N C el 12確定爲對用戶終端進行切換的目標小 區。 進一步地，在步驟S13中’還可以包括子步驟：在源 小區的至少一個相鄰小區中，如果在該實施例中的第一多 媒體廣播多播服務集’例如是{MBMS-Service-1 ’ MBMS Service 3，MBMS_Service_4}，而第一相鄰小區 -20- 201234888 NCell2和第二相鄰小區NCelU所對應的第二多媒體廣播 多播服務集’例如分別都是{MBMS_Service_l ， MBMS_Service_3，MBMS_Service_4}，即對於第一相鄰小 區NCell2和第二相鄰小區NCell4，其分別對應的第二多 媒體廣播多播服務集與用戶終端所對應的第一多媒體廣播 多播服務集之間具有相同的最大交集，即 {MBMS_Service_l，MBMS_Service_3，Μ B M S _ S e r v i c e_4 } ，此處，第一相鄰小區NCell2和第二相鄰小區NCelM都 可以作爲切換目標小區’從而支援用戶終端在源小區的所 有可接收服務的連續性’則此時’基地台1 1可以根據用 戶終端的關於通道的上報資訊，將第一相鄰小區和第二相 鄰小區中通道質量較好的小區確定爲切換目標小區。 此處，如表 5 所示 MBSFN_Area_l 和 MBSFN_Area_2 已經對第一相鄰小區NC el 1_2形成重疊覆蓋。應當注意’ 即便第一相鄰小區NC el 1_2所對應的至少一個組播廣播單 頻網區域即便沒有任何重疊覆蓋’即第—相鄰小區 NCell一2 僅僅對應 MBSFN_Area_l 或 MBSFN一Area_2 中的 —個，此時，NCell_2所對應的第二多媒體廣播多播服務 集便爲{ MBMS_Service_l ， Μ B M S _ S e r v i c e_ 3 }或{ MBMS_Service_4}，此時在步驟S13中’仍然在源小區的 幾個相鄰小區 NCell_l ’ NCell_2 ’ NCell_3 和 NCell_4 之 中選擇對應的第一多媒體廣播多播服務集和第二多媒體廣 播多播服務集之間的交集最大的相鄰小區作爲切換目標小 區，此時，雖然用戶終端可接收的MBMS服務可能會有部 -21 - 201234888 分被中斷，但透過該實施例的方法，仍然以在最大程度上 使用戶終端的接收的一個或多個MBMS盡可能多地保持連 續性。 如圖1所示，在步驟S13之後轉至步驟S1丨，繼續針 對源小區的其他相鄰小區，判斷該相鄰小區是否在源小區 的所有相鄰小區中，具有最大的第一多媒體廣播多播服務 集和第二多媒體廣播多播服務集之間的交集。執行上述方 法遍曆源小區的所有的相鄰小區之後，即可以確定用戶終 端的切換的目標小區。 當然，如上述實施例中的相鄰小區，例如第一相鄰小 區NCel 12或第二相鄰小區NCel 14等，相對於源小區可以 爲同頻相鄰小區和/或異頻相鄰小區。 圖4示出了根據本發明的一個實施例的在無線通信網 路的基地台中用於切換MBMS用戶終端的裝置1〇〇的結構 圖。組播廣播單頻網區域確定裝置1〇1，第二多媒體廣播 多播服務集確定裝置102以及切換目標小區確定裝置103 〇 上述的用於切換MBMS用戶終端的裝置100通常設置 於基地台1 1中，以供該基地台1 1切換其所轄的用戶終端 。其中，組播廣播單頻網區域確定裝置101，用於確定至 少一個相鄰小區中的第一相鄰小區所對應的至少一個組播 廣播單頻網區域。第二多媒體廣播多播服務集確定裝置 1 02，用於根據至少一個組播廣播單頻網區域分別所支援 的多媒體廣播多播服務，確定第一小區所支援的第二多媒 -22- 201234888 體廣播多播服務集。切換目標小區確定裝置1〇3，用於在 至少一個相鄰小區中，如果對於第一相鄰小區，第一多媒 體廣播多播服務集與第二多媒體廣播多播服務集之間具有 最大交集，則將第一相鄰小區確定爲切換目標小區。 在本發明的另一個實施例中，上述的組播廣播單頻網 區域確定裝置1 〇 1還包括，指示資訊基地台獲取模組，或 者指示資訊多小區組播協調實體獲取模組（未示出）；其 中，指示資訊基地台獲取模組用於從第二基地台獲取至少 一個組播廣播單頻網區域的指示資訊：而指示資訊多小區 組播協調實體獲取模組用於，如果第一相鄰小區爲基地台 所轄，則透過M2介面應用協定的建立過程，從多小區組 播協調實體獲取至少一個組播廣播單頻網區域。 以上對本發明的具體實施例進行了描述。需要理解的 是，本發明並不侷限於上述特定實施方式，本領域普通技 術人員可以在所附申請專利範圍的範圍內做出各種變型或 修改。本發明的技術方案用軟體或硬體皆可實現。 【圖式簡單說明】 透過閱讀以下參照附圖對非限制性實施例所作的詳細 描述，本發明的其他特徵、目的和優點將會變得更明顯。 圖1示出了根據本發明的一個實施例的在無線通信網 路的基地台中用於切換MB MS用戶終端的方法流程圖； 圖2示出了根據本發明的另—個實施例的在無線通信 網路的基地台中用於切換MBMS用戶終端的方法的組播廣 -23- 201234888 播單頻網區域確定子步驟的流程圖； 圖3示出了根據本發明的再一個實施例的在無線通信 網路的基地台中用於切換MB MS用戶終端的方法的組播廣 播單頻網區域確定子步驟的流程圖； 圖4示出了根據本發明的一個實施例的在無線通信網 路的基地台中用於切換MBMS用戶終端的裝置的結構圖。 【主要元件符號說明】 11 :基地台 20 :多小區組播協調實體 1 2 :基地台 100:用於切換用戶終端的裝置 101 :組播廣播單頻網區域確定裝置 102:第二多媒體廣播多播服務集確定裝置 103 :切換目標小區確定裝置 -24-201234888 VI. Description of the Invention: [Technical Field] The present invention relates to a wireless communication network, and more particularly to a user terminal for switching a Multimedia Broadcast Multicast Service (MB MS) service in a base station of a wireless communication network method. It is effective to use it to make it effective in its role in the task. There are more than 1 in the medium of service, and the number of the media is increased by the first line [^ the scarce and expensive wireless network resources (such as frequency bands) allocated to the network, so that it can be in the radio band. Parallel service to as many users as possible and as different as possible. While existing second-generation wireless networks support voice services in an efficient manner, the goal of third-generation wireless systems and packet-based wireless networks is to provide optimal service for data communication and distribution in the most efficient manner, depending on the type of service. Optimize network capacity and investment with unicast or broadcast/multicast transmission technologies. Broadcast/multicast technology can be applied when it is necessary to provide (multimedia) data in parallel from a source to a large number of receivers. Unicast technology can be applied when there is a need to exchange data between different communicating entities or when it is necessary to distribute data to one or a small number of receivers, such as on-demand multimedia content. One of the envisaged transmission modes utilizes a so-called SFN (single frequency network) operation in which all cells in the area of the multicast broadcast single frequency network (MBMS SFN, MBSFN) use the same radio resources to transmit the same content in a synchronized manner, thereby making it possible Let the receiving user terminal combine the signals received by the -5-201234888 on the physical layer. This requires that radio resources (e.g., radio resource blocks, TTI, ...) and physical layer parameters (e.g., MCS, modulation and coding scheme) be configured in the same manner in all cells for each session of the MB MS User Service. Here, a Multi-Cell/Multicast Coordination Entity (MCE) can be used. Such an MCE can control cells belonging to one or more eNBs (base stations). However, if the SFN area is selected in such a way that the SFN area exceeds the area controlled by a single MCE, coordination between these MCEs is required. Of course, when a user terminal that is receiving one or more MBMSs has a cell handover on the base station side due to the movement of the user terminal or other reasons, the ideal state should be one or more received by the user terminal. MB MS maintains good service continuity. SUMMARY OF THE INVENTION However, during the experiment, it was found that when a user terminal that is receiving one or more MB MSs has a handover procedure under the control of the base station to which it belongs, one or more MBMSs received by the user terminal. Often it can't continue. Based on the above findings, and further analysis, it is often found that a part of the MBMS receiving users cannot maintain service continuity during the handover process, often because one or more MBMSs supported by the switched target cell are supported by the source cell. One or more MBMSs are not identical. Even the target cell supported by the handover will often have less BMS than the MBMS supported by the source cell, or the target cell will not support the MBMS service at all. 201234888 Therefore, if a kind can be provided It is a beneficial solution for controlling the method of switching user terminals in a base station of a wireless communication network, so that the switched user terminal can maximize the service continuity of the MBMS it receives. According to an embodiment of the present invention, a method for switching a user terminal in a base station of a wireless communication network is provided. The source cell where the user terminal is located is under the jurisdiction of the base station and has at least one neighboring cell, and the user terminal is configured to receive The first multimedia broadcast multicast service set, the method includes: A. determining at least one multicast broadcast single frequency network area corresponding to the first neighboring cell in the at least one neighboring cell; B. according to at least one multicast broadcast a multimedia broadcast multicast service supported by the single frequency network area, respectively, determining a second multimedia broadcast multicast service set supported by the first cell; C. in the at least one neighboring cell, if for the first neighboring cell, The first adjacent cell has a maximum intersection between the first multimedia broadcast multicast service set and the second multimedia broadcast multicast service set, and the first neighboring cell is determined as the handover target cell. According to another embodiment of the present invention, an apparatus for switching a user terminal in a base station of a wireless communication network is provided. The source cell where the user terminal is located is under the jurisdiction of the base station and has at least one neighboring cell, and the user terminal is used by Receiving the first multimedia broadcast multicast service set, the apparatus includes: - a multicast broadcast single frequency network area determining means, configured to determine at least one multicast broadcast list corresponding to the first neighboring cell in the at least one neighboring cell And a multimedia broadcast multicast service set determining apparatus, configured to determine, according to the multimedia broadcast multicast service supported by the at least one multicast broadcast single frequency network area, the second multimedia supported by the first cell a broadcast broadcast multicast service set 1 - handover target cell determining means for 'in the at least one neighboring cell, if the first multimedia broadcast multicast service set and the second multimedia broadcast are more for the first neighboring cell If there is a maximum intersection between the broadcast service sets, the first neighboring cell is determined as the handover target cell. The first multimedia broadcast multicast service set is a set of one or more MBMS services that the user terminal is receiving or capable of receiving in the source cell, and the second multimedia broadcast multicast service set is the user terminal. A set of one or more MBMS services that may be received in the first cell of the handover candidate cell. In the foregoing technical solution, the first neighboring cell is one of the at least one neighboring cell of the source cell where the user terminal is located, and the at least one multicast broadcast single frequency network area determining step is used to obtain the coverage of the first neighboring cell. At least one multicast broadcast single frequency network area; thereby further determining a second multimedia broadcast multicast service set supported by the first cell, if only one cell is included for at least one neighboring cell of the source cell where the user terminal is located , that is, the first neighboring cell, the user terminal can be directly switched to the first neighboring cell; if multiple cells are included, by comparison, if the second multimedia broadcast is receivable in the first neighboring cell The intersection between the multicast service set and the first set of multimedia broadcast multicast services described above switches the user terminal to the first neighboring cell in the largest '-8-201234888 of all neighboring cells. If the foregoing intersection corresponding to the first neighboring cell is not the largest, the steps of the solution may be repeatedly performed until it is determined that the neighboring cell with the largest intersection is switched to the user terminal to switch to the intersection having the largest intersection. In a neighboring cell. Thus, through the above steps, it can be ensured that in all neighboring cells, the user terminal can always be switched to a cell having the largest intersection, thereby maintaining the maximum continuity of the received MBMS service. In the drawings, the same or similar reference numerals are used to refer to the same or similar device or method steps. [Embodiment] FIG. 1 is a flow chart showing a method for switching an MB MS user terminal in a base station 11 of a wireless communication network according to an embodiment of the present invention. The source cell where the user terminal is located is under the jurisdiction of the base station and has at least one neighboring cell, such as NCell_l, NCell_2, NCell_3, NCell_4, and the user terminal is configured to receive the first multimedia broadcast multicast service set, for example, {MBMS_Service_l - MB MS _S ervi c e_3 > Μ BMS _ S ervic e_4 } , as shown, the method includes steps S11, S12 and S13. In step S11, the base station 1 determines at least one multicast broadcast single frequency network area corresponding to the first neighboring cell in the at least one neighboring cell, such as NCell_2. In step S12, the base station π determines the second multimedia broadcast multicast service set supported by the first cell according to the multimedia broadcast multicast service supported by the at least one multicast broadcast single frequency network area respectively; 201234888 In step S13, the base station 1 1 in at least one neighboring cell, if for the first neighboring cell NCell_2 'the first multimedia broadcast multicast service set (eg MBMS_Service_l, MBMS_Service_3, MBMS_Service_4) When there is a maximum intersection between the second multimedia broadcast multicast service sets, the first neighboring cell NCell_2 is determined as the handover target cell. Wherein, the first multimedia broadcast multicast service set (for example, MBMS Service 1 1 MBMS Service 3 > MBMS Service 4) - _ - - - - is one of the user terminals being received or able to receive in the source cell or A set of multiple MBMS services, and the second set of multimedia broadcast multicast services is a set of one or more MBMS services that the user terminal can receive in a first cell that can be used as a handover candidate cell. In some embodiments, the foregoing at least one neighboring cell of the handover candidate cell that can be used by the base station 1 as the user terminal, preferably satisfies the handover measurement reporting criteria from the user terminal. Correspondingly, the above method may further comprise the step of determining at least one neighboring cell based on a handover measurement reporting criterion from the user terminal. In some embodiments, if the first neighboring cell NCell_2 is a cell under the jurisdiction of the base station 11, then, in step S11, the M2 interface establishment process may be directly applied through the M2 interface, from the multi-cell group. The broadcast coordination entity 20 acquires at least one multicast broadcast single frequency network area corresponding to the first neighboring cell NCell_2, for example, MBSFN_Area_1 and MBSFN_Area — 2 0. In other embodiments, if the first neighboring cell NCell_2 is -10 - 201234888 The second base station 12 is under the jurisdiction of the second base station, in step S11, at least one multicast broadcast single frequency network area corresponding to the first neighboring cell NCell_2 (for example, MBSFN_Area_l and MBSFN_Area_2) may be acquired from the multi-cell multicast coordination entity. ) instructions. Optionally, the MBSFN information corresponding to all the cells in the jurisdiction of all the base stations in all the networks may be stored in the multi-cell multicast coordination entity 20, but may be shared and stored in each base station. And updating in real time. At this time, optionally, in step S11, the operation and management configuration (0&M) information may be synchronized between the multi-cell multicast coordination entity 20 and the base station 1 1 . The configuration information may include indication information of at least one multicast broadcast single frequency network region (for example, MBSFN_Area_1 and MBSFN_Area_2) corresponding to the first neighboring cell NCell_2, or preferably, the source cell and the at least one phase where the user terminal is located. Adjacency relationship between neighboring cells. Then, through this step, the base station 11 can obtain the corresponding one or more MBSFN information of the first adjacent cell NCell_2 from the multi-cell multicast coordination entity 20. Alternatively, in another embodiment, step S11 may also obtain the requested at least one from the response of the second base station 12 to the message by sending a request message to the multi-cell multicast coordination entity MCE 20. The multicast broadcast single frequency network area (for example, MBSFN_Area_1 and MBSFN_Area_2), specifically, step S1 1 may further include: “sending an update request of at least one indication information of the multicast broadcast single frequency network area to the multi-cell multicast coordination entity” And the substep of "determining at least one multicast broadcast single frequency network area according to the response of the update request". -11 - 201234888 FIG. 2 is a flow chart showing a multicast broadcast single frequency network region determining sub-step of a method for switching an MBMS user terminal in a base station of a wireless communication network according to another embodiment of the present invention. In this embodiment, the sub-step of "sending an update request of indication information of at least one multicast broadcast single frequency network area to the multi-cell multicast coordination entity" may specifically include steps S 1 1 1 1 and s 1 1 1 2. In step S1111, the base station 11 transmits an update request of the indication information of at least one multicast broadcast single frequency network area to the multi-cell multicast coordination entity 20. At least one of the multicast broadcast single frequency network areas corresponds to the first neighboring cell NCel 1_2 as the handover candidate cell. In step S1 1 1 2, the base station 1 1 determines at least one multicast broadcast single frequency network area according to the response message from the update request of the multi-cell multicast coordination entity 20, for example, may be MBSFN_Area_1 and MBSFN_Area_2. Specifically, the “update request of the indication information of the at least one multicast broadcast single frequency network area” sent in the step S 1 1 1 1 may be based on the existing M2 interface application agreement process, that is, the existing information in the M2 interface application agreement. On the basis of adding an "update request field" to the MBSFN area, in step S1111, the base station 11 can further send an M2 interface configuration update message to the multi-cell multicast coordination entity through the M2 interface application protocol. An update request including indication information of at least one multicast broadcast single frequency network area. Correspondingly, in step S1112, the base station 1 1 may further determine at least one multicast broadcast single frequency network area according to the response of the multi-cell multicast coordination entity to the M2 interface configuration update message. -12- 201234888 The M2 interface configuration update message and the response message in the foregoing embodiment may use, for example, but not limited to, the message format shown in Table 1 below, and the message is sent by the eNB 1 1 to the multi-cell multicast coordination entity MCE 20, The application layer configuration data indicated in the eNB 11 has been changed. Table 1: M2 interface configuration update ("ENB CONFIGURATION UPDATE" message (eNB 11->MCE 20) (Presence) Range (Range) type and reference) (Criticality) Degree (Assigned Criticality) Information Μ 9.2.1.1 YES Face Global eNB ID 0 9.2.1.10 YES eNB Name 0 Printable String (1..150,...) YES Negative System, Zone eNB MBMS with 0..1 YES Reject > eNB MBMS Configuration Assets 1 to <maxnoofCells> EACH Rejection »MUeNBID Μ »>eNB MBMS Configuration Difficult Project 9.2.1.12 »>E-UTRANCGI 9.2.1,11 》> Face neighboring cell 歹 earning cell 1 to <maxnoofIntraFreqNCell> EACH ignores »»EUTRAN CGI Μ 9.2.1.11 - - 》> Same frequency phase, zone list information element 1 to <maxnoofInterFreqNCell> EACH 忽路»»EUTRAN CGI Μ 9.2.1.11 - - Where, inter-frequency neighboring cell The list information element, the co-frequency neighbor cell list information element and their respective corresponding "EUTRAN CGI" are the information elements newly defined in the message. The meanings of some of the items in the above Table 1 are as follows: -13- 201234888 Range description ma xnoofCells The maximum number of cells served by an eNB. This is 256. maxnooflntraFreqNCell The maximum number of adjacent/j, the maximum number of regions. The maximum number of maxn〇〇flntraFreqNCeli is 16_maxnooflnterFreqNCell The maximum number of inter-frequency neighboring cells. maxno〇 The flntraFreqNCell is 16. In the M2 interface configuration update response (CONFIGURATION UPDATE ACKNOWLEDGE) message, the MCE 20 needs to feed back the id information of the same-frequency/inter-frequency MBSFN area requested by the eNB 11 to the eNB 1 1 - In view of the current M2 interface configuration update response (ENB CONFIGURATION UPDATE ACKNOWLEDGE) message. In an embodiment of the present invention, the MSBFN area information of the neighboring cell may be increased as part of the information element "MCCH related BCCH Configuration Item" in the "ENB CONFIGURATION UPDATE ACKNOWLEDGE" message. Thus, an "NCell MBSFN Area" needs to be defined. New Information Element β of Info Item” In this embodiment, specific changes to the information element “MCCH related BCCH Configuration Item” may be, for example but not limited to, as shown in Table 2: -14- 201234888 Table 1 to base station/eNB 11 Information Element Information Element (IE) Name Providing BCCH Configuration Information Related to MCCH Presence Range (IE type and reference) MBSFN Area Identification Μ 9.2.1.14 PDCCH Length Μ Lift type (s), s2, ...) Repeat period Μ Enumeration type (rf32, rf64, rfl28, rf256) Offset Μ 罄® (o..io) Modify period 枚 Enum type (rf512, rfl024) Subframe position Information Μ bit string (SIZE(6)) Modulation coding scheme 枚 Enumeration type (n2, n7, nl3, nl9) Cell information list 0..1 > Cell information 1 to <maxnoofCells> »E-UTRAN CGI Μ 9.2.1.11 »Cell reservation information 枚 enumerated type (reservedCell, nonReservedCell,...) »> co-frequency neighboring cell 1 to MBSFN area information list » <maxnooflntraFreqNCell>»> neighboring cell MBSFN area information projectΜ 9.2.1.x >"Inter-frequency neighboring cell 1 to MBSFN area information list <maxnoofInterFreqNCell>>»Neighboring cell MBSFN area information project Μ 9.2.1.x Among them, "inter-frequency neighboring cell MB S FN The area information list, the "same frequency neighboring cell MB SFN area information list" and their corresponding "adjacent cell MBSFN area information project" are newly defined information elements in the message. Specifically, the newly added information element definition The "NCell MBSFN Area Info Item" may exist in a form such as, but not limited to, Table 3 below. The "NCell MBSFN Area Info Item" information element provides id information of the MBSFN area of the neighboring cell. -15- 201234888 Table 3: NCell MBSFN Area Info Item Information Element (IE) Name Presence Range (IE type and reference) Semantics description EUTRAN CGI M 9.2. 1.11 MBSFN Area Id List 1 to <maxnoofMB SFNArea>> MBSFN Area Id M 9.2.1.14 値 Range Description MaxnoofMBSFNArea The maximum number of MBSFN areas that can be overlapped in this area. Here, maxnoofMBSFNArea is taken as 8. As an alternative method, in another embodiment of the present invention, the indication of "at least one multicast broadcast single frequency network area sent in step S1 1 1 1" The information update request may be implemented by newly defining a message interface in the existing M2 interface, that is, in step S1 1 1 1 , the base station 11 may send the multimedia broadcast multicast configuration information of the base station to the multi-cell multicast coordination entity. The request message, the configuration information request message is a new message of the M2 interface application agreement, and includes an update request of the indication information of at least one multicast broadcast single frequency network area. Correspondingly, in step S1 1 1 2, the base station 1 1 may determine at least one multicast broadcast single frequency network area according to the response of the multi-cell multicast coordination entity to the configuration information request message. Here, those skilled in the art should understand that the above-mentioned information newly used in the M2 interface application agreement for the base station 11 to request the MCE 20 to request the MBSFN area indication information of the neighboring cell and the response message thereof can be referred to the specific form. The form of the information element definition in Tables 1 to 3 above is defined. The specific form of its definition does not constitute a limitation of the invention. -16- 201234888 Of course, those skilled in the art should understand that the sub-step of "acquiring the indication information of at least one multicast broadcast single frequency network area from the multi-cell multicast coordination entity" in step s 1 1 is not limited to the above At least one update request of the indication information of the multicast broadcast single frequency network area, thereby obtaining the indication information of the at least one multicast broadcast single frequency network area according to the response of the multi-cell multicast coordination entity MCE 20 to the request, of course, further Including other forms of obtaining sub-steps, for example, the MCE 20 may periodically actively send a message including indication information of at least one multicast broadcast single-frequency network area corresponding to the first neighboring cell NCel 1_2, correspondingly, first The base station 1 1 periodically receives the message through the information, so as to obtain the indication information of the at least one multicast broadcast single frequency network area. Alternatively, in another embodiment of the present invention, the base station 11 can acquire not only the MCE 20 side but also the second neighboring cell 12 from the second neighboring cell NC e 11 _2. A multicast broadcast single-frequency network area information. 3 is a flow chart showing a multicast broadcast single frequency network region determining sub-step of a method for switching an MBMS user terminal in a base station of a wireless communication network in accordance with still another embodiment of the present invention. The X2 interface establishment request message transmission step S1 121 and the X2 interface establishment response message reception step S 1 1 2 2 are included. In the above steps S1121 and S1122, the X2 interface establishment process is utilized to exchange the cells of the respective base stations under the jurisdiction of the plurality of base stations in the network including the base station 11 and the second base station 12. The MBSFN subframe information is exchanged. Therefore, in the embodiment of the present invention, the MBSFN area indication information exchanged by the base station and the cell under the jurisdiction of the second base station 12 is performed in the X2-17-201234888 interface establishment process. That is, in step S1122, 'the base station 11 receives the X2 interface setup request message from the second base station through the X2 interface application protocol' or vice versa, in step S1111, the base station 11 may send the X2 interface to the second base station. Receiving the message and receiving the X2 interface setup response message from the second base station in step S11U, each of the X2 interface setup request message or the χ2 interface setup response message includes a group of at least one cell corresponding to the second base station 12. The indication information of the broadcast single frequency network area (for example, MBSFN_Area_l and MBSFN_Area_2) is broadcasted. Of course, the base station 11 may also receive the “eNB configuration update message” from the second base station 12 through the X2 interface application protocol, or send the “eNB configuration update message” to the second base station 12 to receive the The response message of the "eN B configuration update message" of the second base station 12, the configuration update message and the response message thereof include a multicast broadcast single frequency network area of at least one cell under the jurisdiction of the second base station 12 (for example, MBSFN_Area_l and The information element of the indication information of the MB S FN_ Area_2 ) is based on the X2 SETUP REQUEST, the X2 SETUP RESPONSE and the definition of the ENB CONFIGURATION UPDATE message in the existing X2AP signal. In some embodiments of the present invention, in the above-mentioned signal message, for the cell under the jurisdiction of each base station 11 in the network, the definition of "Served Cell Information" is added to the MBSFN area information, of course, - 18- 201234888 Here, preferably, the improvement of the signal information is based on the form of the signal/message of the TS 3 6.4 2 3 V 9.4.0 version. Line. The specific format of the information element such as the "MBSFN area indication" may be the same as the format changed in the above Tables 1 to 3, or may be different, and will not be described herein, but the specific modification form of the signal/message format. It is not intended to limit the invention. Here, it is assumed that the MBMS set receivable by the user terminal and its corresponding MB SNF area are as shown in Table 4 below: MBMS service area MBMSNF1 MBMS Service Area MBMBN Area 1 corresponding to the MBMS service MBMS service MBMS service area MBMSN Area 1 MBMS Service 4 MBSMF Area 2 Simultaneously assume that the MBS FN area identification information corresponding to all neighboring cells of the source cell is as shown in Table 5: Id NCelll MBSFN Area 1 NCell2 MBSFN of the MBSFN area corresponding to the adjacent cell of the different frequency neighboring cell Area 1 MBSFN Area 2 NCelB MBSFN Area 3 NCell4 MBSFN Area 2 The first neighboring cell NCell2 can be used as a candidate handover cell of the user terminal by determining the handover criterion of the handover of the user terminal. Then, in step -19-201234888, the base station 11 can obtain a multicast broadcast single frequency network area (for example, MBSFN_Area_l and MBSFN_Area_2) of a neighboring cell of the source cell, for example, the first neighboring cell NCell2. In step S12, the base station 11 can determine the first supported by the first adjacent cell NCel 12 based on the information of the multimedia broadcast multicast service supported by the multicast broadcast single frequency network regions MBSFN_Area_1 and MBSFN_Area_2, respectively. Two multimedia broadcast multicast service sets. For example, assuming that the multimedia broadcast multicast service supported by MBSFN_Area_1 is MBMS_Service_1, MBMS_Service_3, and the multimedia broadcast multicast service supported by ΜBSFN_A rea-2 is MBMS_ServiCe_4, the base station 1 1 can determine the first neighboring cell NC. The second multimedia broadcast multicast service set supported by ell 2 is {MBMS_Service_l, MBMS_Service_3, MBMS_Service_4}, and (in neighboring cells NCelll, NCell2, NCell3, NCell4, for the first neighboring cell NCell2, first The multimedia broadcast multicast service set {MBMS_Service_l 'MBMS_Service_3, MBMS_Service_4} has the largest intersection with the second multimedia broadcast multicast service set {MBMS_Service_l, MBMS_Service_3 'MBMS_Service_4}, where the two sets are completely coincident, then The first neighboring cell NC el 12 is determined as the target cell that performs handover to the user terminal. Further, in step S13, 'sub-step may also be included: in at least one neighboring cell of the source cell, if in this embodiment The first multimedia broadcast multicast service set 'for example is {MBMS-Service-1 ' MBMS Servi Ce 3, MBMS_Service_4}, and the second multimedia broadcast multicast service set corresponding to the first neighboring cell -20-201234888 NCell2 and the second neighboring cell NCelU are, for example, {MBMS_Service_l, MBMS_Service_3, MBMS_Service_4}, respectively That is, for the first neighboring cell NCell2 and the second neighboring cell NCell4, the corresponding second multimedia broadcast multicast service set respectively has the same relationship as the first multimedia broadcast multicast service set corresponding to the user terminal. The maximum intersection, that is, {MBMS_Service_l, MBMS_Service_3, Μ BMS_S ervic e_4 }, where both the first neighboring cell NCell2 and the second neighboring cell NCelM can serve as the handover target cell', thereby supporting the user terminal in the source cell. The continuity of the service can be received. At this time, the base station 11 can determine the cell with better channel quality in the first neighboring cell and the second neighboring cell as the handover target according to the reporting information about the channel of the user terminal. Here, as shown in Table 5, MBSFN_Area_l and MBSFN_Area_2 have formed overlapping coverage for the first neighboring cell NC el 1_2. It should be noted that even if at least one multicast broadcast single frequency network area corresponding to the first neighboring cell NC el 1_2 does not have any overlapping coverage, that is, the first neighboring cell NCell-2 only corresponds to one of MBSFN_Area_l or MBSFN-Area_2. At this time, the second multimedia broadcast multicast service set corresponding to NCell_2 is {MBMS_Service_l, ΜBMS_S ervic e_ 3 } or { MBMS_Service_4}, and at this time, in step S13, 'still several in the source cell. Selecting, in the neighboring cell NCell_l 'NCell_2' NCell_3 and NCell_4, a neighboring cell having the largest intersection between the corresponding first multimedia broadcast multicast service set and the second multimedia broadcast multicast service set as the handover target cell, At this time, although the MBMS service receivable by the user terminal may be interrupted by the section - 21 - 201234888, the method of the embodiment still uses the one or more MBMSs of the user terminal to be maximized as much as possible. Maintain continuity in many places. As shown in FIG. 1, after step S13, the process goes to step S1, and continues to determine for the neighboring cells of the source cell whether the neighboring cell is in all neighboring cells of the source cell and has the largest first multimedia. An intersection between a broadcast multicast service set and a second multimedia broadcast multicast service set. After performing the above method to traverse all neighboring cells of the source cell, the target cell of the handover of the user terminal can be determined. Certainly, the neighboring cells in the foregoing embodiment, for example, the first neighboring cell NCel 12 or the second neighboring cell NCel 14, etc., may be intra-frequency neighbor cells and/or inter-frequency neighbor cells with respect to the source cell. 4 is a block diagram showing an apparatus 1 for switching an MBMS user terminal in a base station of a wireless communication network in accordance with one embodiment of the present invention. The multicast broadcast single frequency network area determining apparatus 101, the second multimedia broadcast multicast service set determining apparatus 102, and the handover target cell determining apparatus 103. The apparatus 100 for switching the MBMS user terminal described above is usually set in the base station. In 1 1 , the base station 11 switches the user terminal under its jurisdiction. The multicast broadcast single frequency network area determining apparatus 101 is configured to determine at least one multicast broadcast single frequency network area corresponding to the first neighboring cell in at least one neighboring cell. The second multimedia broadcast multicast service set determining apparatus 102 is configured to determine, according to the multimedia broadcast multicast service supported by the at least one multicast broadcast single frequency network area, the second multimedia 22 supported by the first cell - 201234888 Volume Broadcast Multicast Service Set. a handover target cell determining apparatus 1-3 for use in at least one neighboring cell, if for the first neighboring cell, between the first multimedia broadcast multicast service set and the second multimedia broadcast multicast service set With the largest intersection, the first neighboring cell is determined as the handover target cell. In another embodiment of the present invention, the multicast broadcast single frequency network area determining apparatus 1 further includes an indication information base station acquisition module or an information multi-cell multicast coordination entity acquisition module (not shown). And indicating that the information base station acquisition module is configured to acquire, from the second base station, at least one indication information of the multicast broadcast single frequency network area: and the indication information multi-cell multicast coordination entity acquisition module is used, if An adjacent cell is under the jurisdiction of the base station, and at least one multicast broadcast single frequency network area is obtained from the multi-cell multicast coordination entity through the establishment process of the M2 interface application protocol. The specific embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the appended claims. The technical solution of the present invention can be realized by software or hardware. BRIEF DESCRIPTION OF THE DRAWINGS Other features, objects, and advantages of the invention will be apparent from the description of the appended claims. 1 shows a flow chart of a method for switching an MB MS user terminal in a base station of a wireless communication network in accordance with an embodiment of the present invention; FIG. 2 illustrates a wireless device in accordance with another embodiment of the present invention. A flowchart of a multicast wide -23-201234888 broadcast single frequency network region determining sub-step of a method for switching an MBMS user terminal in a base station of a communication network; FIG. 3 illustrates a wireless device according to still another embodiment of the present invention. A flowchart of a multicast broadcast single frequency network region determining sub-step of a method for switching an MB MS user terminal in a base station of a communication network; FIG. 4 illustrates a base in a wireless communication network according to an embodiment of the present invention A block diagram of a device for switching an MBMS user terminal in Taichung. [Description of main component symbols] 11: Base station 20: Multi-cell multicast coordination entity 1 2: Base station 100: Apparatus for switching user terminals 101: Multicast broadcast single frequency network area determining apparatus 102: Second multimedia Broadcast Multicast Service Set Determination Apparatus 103: handover target cell determination apparatus-24-