TWI725357B - Base station and handover control method thereof - Google Patents

Base station and handover control method thereof Download PDF

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TWI725357B
TWI725357B TW107143041A TW107143041A TWI725357B TW I725357 B TWI725357 B TW I725357B TW 107143041 A TW107143041 A TW 107143041A TW 107143041 A TW107143041 A TW 107143041A TW I725357 B TWI725357 B TW I725357B
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base station
handover
dual connection
handover request
connection information
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TW107143041A
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TW202023304A (en
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邱子哲
葉昌國
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中磊電子股份有限公司
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

A base station and a handover control method thereof are provided. The base station supports dual connectivity (DC) technology. The method includes the following steps. A handover request is transmitted, and a handover request response corresponding to the handover request is received. Whether the handover request response includes DC information is determined. In response to the handover request response not including the DC information, DC information related to releasing DC configuration is generated, and a handover command including the DC information is transmitted. The handover command corresponds to the handover request response. Accordingly, user equipment can be informed to release the DC configuration, so as to reduce power. In addition, a proper resource configuration would be provided.

Description

基地台及其換手控制方法Base station and its handover control method

本發明是有關於一種通訊換手(handover)技術，且特別是有關於一種基地台及其換手控制方法。The present invention relates to a communication handover technology, and particularly relates to a base station and a handover control method thereof.

圖1是習知雙連接 (Dual Connectivity，DC)系統1架構圖。請參照圖1，此系統1包括兩基地台MBS, SBS及使用者設備UE。基地台MBS是主節點，其負責與使用者設備UE通訊並透過X2介面與輔助(secondary)節點(即，基地台SBS)協調使用者設備所用的無線電資源。無線電資源控制(Radio Resource Control，RRC)信令(singling)連線僅會存在於使用者設備UE與基地台MBS之間，但資料傳遞可在使用者設備UE與兩基地台MBS, SBS之間。此系統1的目的是用於透過基地台SBS提升使用者的資料傳輸量(throughput)。Fig. 1 is an architecture diagram of a conventional dual connectivity (DC) system 1. Please refer to Figure 1. This system 1 includes two base stations MBS, SBS and user equipment UE. The base station MBS is the master node, which is responsible for communicating with the user equipment UE and coordinating the radio resources used by the user equipment with the secondary node (ie, the base station SBS) through the X2 interface. Radio Resource Control (RRC) signaling (singling) connection will only exist between the user equipment UE and the base station MBS, but the data transmission can be between the user equipment UE and the two base stations MBS, SBS . The purpose of this system 1 is to increase the data throughput of users through the base station SBS.

當使用者設備UE在兩基地台資源換手時，使用者設備UE的資料服務將需要受保留。圖2是一範例說明習知換手情境。請參照圖2，來源基地台BSS是使用者設備UE連線的原基地台，而目標基地台BST是使用者設備UE預計連線的基地台。當使用者設備UE由來源基地台BSS移動到目標基地台BST的服務涵蓋範圍時，使用者設備UE會斷開與來源基地台BSS的連線並與目標基地台BST建立連線。至於使用者設備的上下文(context)，若兩基地台BSS, BST之間存在X2介面則直接透過X2介面傳送，或是透過連線到行動管理實體(Mobile Management Entity，MME)MME的S1介面傳送。When the user equipment UE changes hands between two base station resources, the data service of the user equipment UE will need to be reserved. Figure 2 is an example to illustrate the situation of changing hands. Referring to FIG. 2, the source base station BSS is the original base station that the user equipment UE is connected to, and the target base station BST is the base station that the user equipment UE is expected to connect to. When the user equipment UE moves from the source base station BSS to the service coverage of the target base station BST, the user equipment UE will disconnect from the source base station BSS and establish a connection with the target base station BST. As for the context of the user equipment, if there is an X2 interface between the two base stations BSS and BST, it will be sent directly through the X2 interface, or through the S1 interface connected to the Mobile Management Entity (MME) MME. .

值得注意的是，雙連接技術在以下情況可能遭遇問題。圖3是習知換手行為的信令流程圖。請參照圖3，假設目標基地台BST是不支援雙連接功能的傳統基地台，而使用者設備UE則經組態與來源基地台BSS和輔助基地台SBS執行雙連接。此外，在此情境中，使用者設備UE的上下文可在來源基地台BSS與輔助基地台SBS之間的X2介面交換傳遞，但非透過S1介面。當來源基地台BSS決定換手至目標基地台BST時，來源基地台BSS傳送伴隨著使用者設備UE的上下文的換手請求(handover request)(步驟S301)。目標基地台BST無法得知使用者設備UE的雙連接組態(configuration)，亦無法在換手請求回應中提供相關於雙連接設定。在接收到換手請求回應(handover request acknowledge) (步驟S302)之後，來源基地台BSS基於輔助基地台SBS的類型傳送輔助演進型節點B(Secondary eNodeB，SeNB)釋放或輔助次世代節點B(Secondary gNodeB，SgNB)釋放請求(步驟S303)，以釋放使用者設備UE所用輔助基地台SBS的無線電資源。若輔助基地台SBS屬於gNB，則會回覆SgNB釋放請求確認(步驟S304)。另一方面，來源基地台BSS會直接傳送換手指令(handover command)給使用者設備UE(步驟S305)。在換手至目標基地台BST(步驟S306)之後，使用者設備UE的雙連接組態仍存在，且使用者設備UE會持續監控輔助基地台SBS。然而，目標基地台BST因不支援雙連接功能而無法連接輔助基地台SBS，讓輔助基地台SBS繼續與使用者設備UE通訊。接著，若使用者設備UE偵測到與輔助基地台SBS的連線失敗，即請求目標基地台BST處理失敗情況。然而，目標基地台BST因不支援雙連接功能，而使得使用者設備UE將無法自目標基地台BST得到任何回應。在此情境中可能會有兩個缺點。第一缺點是，使用者設備UE將浪費電力來繼續監控輔助基地台SBS。第二缺點是，使用者設備UE的資源組態與目標基地台BST不一致。而不一致的資源組態將使得目標基地台BST可能會傳送不合適的資源組態，且進一步影響與使用者設備UE的連線或資料服務。It is worth noting that dual connection technology may encounter problems in the following situations. Figure 3 is a signaling flow chart of the conventional handover behavior. Referring to FIG. 3, it is assumed that the target base station BST is a traditional base station that does not support the dual connection function, and the user equipment UE is configured to perform dual connections with the source base station BSS and the auxiliary base station SBS. In addition, in this scenario, the context of the user equipment UE can be exchanged on the X2 interface between the source base station BSS and the auxiliary base station SBS, but not through the S1 interface. When the source base station BSS decides to handover to the target base station BST, the source base station BSS transmits a handover request accompanied by the context of the user equipment UE (step S301). The target base station BST cannot know the dual connection configuration of the user equipment UE, and cannot provide the dual connection configuration in the handover request response. After receiving the handover request acknowledge (step S302), the source base station BSS transmits the secondary eNodeB (Secondary eNodeB, SeNB) release or secondary generation node B (Secondary NodeB) based on the type of the secondary base station SBS. gNodeB, SgNB) release request (step S303) to release the radio resources of the secondary base station SBS used by the user equipment UE. If the secondary base station SBS belongs to the gNB, it will reply to the SgNB release request confirmation (step S304). On the other hand, the source base station BSS will directly send a handover command to the user equipment UE (step S305). After switching to the target base station BST (step S306), the dual connection configuration of the user equipment UE still exists, and the user equipment UE will continue to monitor the auxiliary base station SBS. However, the target base station BST cannot connect to the auxiliary base station SBS because it does not support the dual connection function, so that the auxiliary base station SBS continues to communicate with the user equipment UE. Then, if the user equipment UE detects that the connection with the auxiliary base station SBS fails, it requests the target base station BST to process the failure condition. However, since the target base station BST does not support the dual connection function, the user equipment UE will not be able to get any response from the target base station BST. There may be two disadvantages in this situation. The first disadvantage is that the user equipment UE will waste power to continue monitoring the auxiliary base station SBS. The second disadvantage is that the resource configuration of the user equipment UE is inconsistent with the target base station BST. The inconsistent resource configuration will cause the target base station BST to transmit inappropriate resource configuration, and further affect the connection or data service with the user equipment UE.

有鑑於此，本發明提供一種基地台及其換手控制方法，期能解決前述情境所遭遇的缺點或問題，進而讓基地台與使用者設備的連線或資料服務能持續。In view of this, the present invention provides a base station and its handover control method, which is expected to solve the shortcomings or problems encountered in the aforementioned scenarios, and thereby enable the connection or data service between the base station and the user equipment to continue.

本發明實施例的換手控制方法，其適用於支援雙連接技術的基地台。此換手控制方法至少包括但不僅限於下列步驟。傳送換手請求。接收對應於此換手請求的換手請求回應。判斷此換手請求回應是否有雙連接資訊。反應於此換手請求回應未有雙連接資訊，產生相關於釋放雙連接組態的雙連接資訊，並傳送包括此雙連接資訊的換手指令。而此換手指令是對應於前述換手請求回應。The handover control method of the embodiment of the present invention is suitable for base stations supporting dual connection technology. This handover control method at least includes but is not limited to the following steps. Send a handover request. Receive a handover request response corresponding to this handover request. Determine whether this handover request response has dual connection information. In response to the fact that there is no dual connection information in the response to the handover request, the dual connection information related to the release of the dual connection configuration is generated, and the handover command including the dual connection information is sent. And this handover instruction corresponds to the aforementioned handover request response.

本發明實施例的基地台，其支援雙連接技術，並至少包括但不僅限於傳送器、接收器及處理器。傳送器用以傳送訊號。接收器用以接收訊號。處理器耦接傳送器及接收器，並經組態用以執行下列步驟。透過傳送器傳送換手請求。透過接收器接收對應於此換手請求的換手請求回應。判斷換手請求回應是否有雙連接資訊。反應於此換手請求回應未有此雙連接資訊，產生相關於釋放雙連接組態的雙連接資訊，並透過傳送器傳送包括此雙連接資訊的換手指令，而此換手指令對應於換手請求回應。The base station of the embodiment of the present invention supports dual connection technology, and includes at least but not limited to a transmitter, a receiver, and a processor. The transmitter is used to transmit the signal. The receiver is used to receive the signal. The processor is coupled to the transmitter and the receiver, and is configured to perform the following steps. Send a handover request through the transmitter. Receive a handover request response corresponding to this handover request through the receiver. Determine whether there is dual connection information in the response to the handover request. In response to the fact that there is no such dual connection information in the handover request response, the dual connection information related to the release of the dual connection configuration is generated, and the handover command including the dual connection information is sent through the transmitter, and the handover command corresponds to the handover Hand asks for a response.

基於上述，本發明實施例的基地台及其換手控制方法，透過對應於換手請求的回應中的資訊判斷目標基地台是否支援雙連接功能。反應於目標基地台不支援雙連接功能，來源基地台主動產生相關於釋放雙連接組態的雙連接資訊，並將此雙連接資訊傳送給使用者設備，讓使用者設備可據以停止/禁能/解除雙連接功能。藉此，使用者設備將無須浪費電力來繼續監控輔助基地台，且使用者設備與來源基地台之間的資料傳輸及服務能不會異常中斷。Based on the above, the base station and its handover control method according to the embodiment of the present invention determine whether the target base station supports the dual connection function through the information in the response corresponding to the handover request. Reflecting that the target base station does not support the dual connection function, the source base station actively generates the dual connection information related to the release of the dual connection configuration, and sends the dual connection information to the user device, so that the user device can stop/ban accordingly Enable/disable dual connection function. In this way, the user equipment will not need to waste power to continue to monitor the auxiliary base station, and the data transmission and service between the user equipment and the source base station will not be abnormally interrupted.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

圖4是依據本發明一實施例的通訊系統4的示意圖。請參照圖4，此通訊系統4至少包括但不僅限於使用者設備401、來源基地台410、輔助基地台420、目標基地台430及行動管理實體(MME)440。需說明的是，此通訊系統4中各裝置的數量及位置僅適用於範例說明，應用者可依據實際需求而改變。FIG. 4 is a schematic diagram of a communication system 4 according to an embodiment of the invention. Please refer to FIG. 4, this communication system 4 at least includes but is not limited to a user equipment 401, a source base station 410, an auxiliary base station 420, a target base station 430 and a mobile management entity (MME) 440. It should be noted that the number and location of each device in the communication system 4 are only suitable for example, and the user can change it according to actual needs.

使用者設備401可能有多種實施態樣，例如可包含(但不限於)移動站、先進移動站(Advanced Mobile Station，AMS)、電話裝置、客戶駐地設備(Customer Premise Equipment，CPE)、無線感測器等。The user equipment 401 may have various implementations, such as (but not limited to) mobile stations, advanced mobile stations (Advanced Mobile Station, AMS), telephone devices, customer premise equipment (Customer Premise Equipment, CPE), wireless sensing器等。

來源基地台410可能有多種實施態樣，例如是(但不限於)家用演進型節點B(Home Evolved Node B，HeNB)、eNB、次世代節點B(gNB)、進階基地台(Advanced Base Station，ABS)、基地收發器系統(Base Transceiver System，BTS)、中繼器(relay)、轉發器(repeater)、及/或基於衛星的通信基地台。The source base station 410 may have multiple implementation modes, such as (but not limited to) Home Evolved Node B (HeNB), eNB, next-generation node B (gNB), and advanced base station (Advanced Base Station). , ABS), Base Transceiver System (BTS), relay, repeater, and/or satellite-based communication base station.

圖5是依據本發明一實施例的來源基地台410的元件方塊圖。請參照圖5，來源基地台410可至少包括(但不限於)一根或更多根天線411、接收器412、傳送器413、類比至數位(A/D)/數位至類比(D/A)轉換器414、儲存器415及處理器416。FIG. 5 is a block diagram of components of a source base station 410 according to an embodiment of the invention. 5, the source base station 410 may include (but not limited to) at least one or more antennas 411, receiver 412, transmitter 413, analog to digital (A/D)/digital to analog (D/A) ) Converter 414, storage 415 and processor 416.

接收器412及傳送器413分別用以透過天線411無線地接收上行鏈路(uplink)訊號及傳送下行鏈路(downlink)訊號。接收器412及傳送器413亦可執行諸如低雜訊放大、阻抗匹配、混頻、升頻或降頻轉換、濾波、放大及其類似者的類比訊號處理操作。類比至數位/數位至類比轉換器414經組態以在上行鏈路信號處理期間自類比信號格式轉換為數位信號格式，且在下行鏈路信號處理期間自數位信號格式轉換為類比信號格式。The receiver 412 and the transmitter 413 are used to wirelessly receive an uplink signal and transmit a downlink signal through the antenna 411, respectively. The receiver 412 and the transmitter 413 can also perform analog signal processing operations such as low noise amplification, impedance matching, frequency mixing, frequency up or down conversion, filtering, amplification and the like. The analog-to-digital/digital-to-analog converter 414 is configured to convert from an analog signal format to a digital signal format during uplink signal processing, and to convert from a digital signal format to an analog signal format during downlink signal processing.

儲存器415可以係任何型態的固定或可移動隨機存取記憶體（Random Access Memory，RAM）、唯讀記憶體（Read-Only Memory，ROM）、快閃記憶體（Flash Memory）或類似元件或上述元件的組合。儲存器415記錄程式碼、裝置組態、碼本(Codebook)、緩衝的或永久的資料，並記錄諸如無線電資源控制(Radio Resource Control，RRC)層、媒體存取控制(Media Access Control，MAC)層(或媒體存取層)、實體層等其他各種通訊協定相關軟體模組。The storage 415 can be any type of fixed or removable random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), flash memory (Flash Memory) or similar components Or a combination of the above elements. The memory 415 records code, device configuration, codebook, buffered or permanent data, and records such as Radio Resource Control (RRC) layer and Media Access Control (MAC) Layer (or media access layer), physical layer and other various communication protocol-related software modules.

處理器416經組態以處理數位信號且執行根據本發明的例示性實施例之程序，並可存取或載入儲存器415所記錄的資料及軟體模組。處理器416的功能可藉由使用諸如中央處理單元(Central Processing Unit，CPU)、微處理器、微控制器、數位信號處理(Digital Signal Processing，DSP)晶片、場可程式化邏輯閘陣列(Field Programmable Gate Array，FPGA)等可程式化單元來實施。處理器416的功能亦可用獨立電子裝置或積體電路(Integrated Circuit，IC)實施，且處理器416之操作亦可用軟體實現。The processor 416 is configured to process digital signals and execute programs according to the exemplary embodiment of the present invention, and can access or load data and software modules recorded in the memory 415. The functions of the processor 416 can be achieved by using central processing units (CPU), microprocessors, microcontrollers, digital signal processing (DSP) chips, and field programmable logic gate arrays (Field Programmable Logic Gate Array). Programmable Gate Array, FPGA) and other programmable units to implement. The function of the processor 416 can also be implemented by an independent electronic device or an integrated circuit (IC), and the operation of the processor 416 can also be implemented by software.

輔助基地台420的實施態樣及其具備元件可參酌來源基地台410的說明，於此不再贅述。值得注意的是，於本實施例中，來源基地台410及輔助基地台420支援雙連接功能。來源基地台410作為主節點，而輔助基地台420作為輔助節點。當來源基地台410及輔助基地台420透過雙連接功能服務使用者設備401時，控制信令係在來源基地台410與使用者設備401之間傳遞，而資料可在來源基地台410與使用者設備401之間或是輔助基地台420與使用者設備401之間傳遞。The implementation of the auxiliary base station 420 and its components can be referred to the description of the source base station 410, which will not be repeated here. It is worth noting that in this embodiment, the source base station 410 and the auxiliary base station 420 support the dual connection function. The source base station 410 serves as the master node, and the auxiliary base station 420 serves as the auxiliary node. When the source base station 410 and the auxiliary base station 420 serve the user equipment 401 through the dual connection function, the control signaling is transferred between the source base station 410 and the user equipment 401, and the data can be transmitted between the source base station 410 and the user equipment 401. Transfer between the equipment 401 or between the auxiliary base station 420 and the user equipment 401.

目標基地台430的實施態樣及其具備元件可參酌來源基地台410的說明，於此不再贅述。值得注意的是，於本實施例中，目標基地台430不支援雙連接功能。即，目標基地台430無法與輔助基地台420或其他基地台同時服務使用者設備401，且僅能獨自提供服務。The implementation mode of the target base station 430 and its components can be referred to the description of the source base station 410, which will not be repeated here. It is worth noting that in this embodiment, the target base station 430 does not support the dual connection function. That is, the target base station 430 cannot simultaneously serve the user equipment 401 with the auxiliary base station 420 or other base stations, and can only provide services alone.

行動管理實體440可能有多種實施態樣，例如是(但不限於)伺服器、電腦主機、工作站等裝置。行動管理實體440可與來源基地台410、及目標基地台430透過S1介面連接，並用以管理使用者設備401的位置、換手的相關資料或行為。The mobile management entity 440 may have various implementation modes, such as (but not limited to) servers, computer hosts, workstations and other devices. The mobile management entity 440 can be connected to the source base station 410 and the target base station 430 through the S1 interface, and is used to manage the location of the user equipment 401 and related data or behaviors of handover.

為了方便理解本發明實施例的操作流程，以下將舉諸多實施例詳細說明本發明實施例中通訊系統4之運作流程。下文中，將搭配通訊系統4中各裝置說明本發明實施例所述之方法。本發明實施例方法的各個流程可依照實施情形而隨之調整，且並不僅限於此。In order to facilitate the understanding of the operation process of the embodiment of the present invention, a number of embodiments will be given below to describe in detail the operation process of the communication system 4 in the embodiment of the present invention. Hereinafter, the method described in the embodiment of the present invention will be explained in conjunction with each device in the communication system 4. Each process of the method of the embodiment of the present invention can be adjusted accordingly according to the implementation situation, and is not limited to this.

圖6是依據本發明一實施例的換手控制方法的流程圖。請參照圖4及圖6，假設使用者設備401原先受來源基地台410及輔助基地台420透過雙連接功能同時服務。而當使用者設備401移動到目標基地台430時，來源基地台410決定將使用者設備401換手至目標基地台430(例如，目標基地台430的接收訊號強度大於來源基地台410的接收訊號強度等判斷機制)。來源基地台410的處理器416會透過其傳送器413傳送換手請求(步驟S610)。若基於X2的換手行為，則此換手請求可以是3GPP TS 36.423所定義的HANDOVER REQUEST訊息，並是傳送至目標基地台430；而若基於S1的換手行為，則此換手請求可以是3GPP TS 36.413所定義的HANDOVER REQUIRED訊息，並是傳送至行動管理實體440。Fig. 6 is a flowchart of a handover control method according to an embodiment of the present invention. Please refer to FIGS. 4 and 6, assuming that the user equipment 401 is originally served by the source base station 410 and the auxiliary base station 420 at the same time through the dual connection function. When the user equipment 401 moves to the target base station 430, the source base station 410 decides to switch the user equipment 401 to the target base station 430 (for example, the received signal strength of the target base station 430 is greater than that of the source base station 410 Judgment mechanism such as intensity). The processor 416 of the source base station 410 transmits the handover request through its transmitter 413 (step S610). If the handover behavior is based on X2, the handover request can be a HANDOVER REQUEST message defined in 3GPP TS 36.423 and sent to the target base station 430; and if the handover behavior is based on S1, the handover request can be The HANDOVER REQUIRED message defined in 3GPP TS 36.413 is sent to the mobile management entity 440.

接著，來源基地台410的處理器416可透過其接收器412接收來自目標基地台430或行動管理實體440對應於步驟S610所傳送換手請求的換手請求回應(步驟S620)。若基於X2的換手行為，則此換手請求回應可以是3GPP TS 36.423所定義的換手請求確認(HANDOVER REQUEST ACKNOWLEDGE)訊息(可包括換手指令(HANDOVER COMMAND))，並是來自目標基地台430；而若基於S1的換手行為，則此換手請求可以是3GPP TS 36.413所定義的換手指令(HANDOVER COMMAND)訊息，並是來自行動管理實體440。Then, the processor 416 of the source base station 410 may receive a handover request response from the target base station 430 or the mobile management entity 440 corresponding to the handover request transmitted in step S610 through its receiver 412 (step S620). If it is based on the X2 handover behavior, the handover request response can be a handover request confirmation (HANDOVER REQUEST ACKNOWLEDGE) message defined in 3GPP TS 36.423 (which can include a handover command (HANDOVER COMMAND)), and it can be from the target base station 430; and if the handover behavior is based on S1, the handover request can be a handover command (HANDOVER COMMAND) message defined by 3GPP TS 36.413, and it comes from the action management entity 440.

來源基地台410的處理器416會判斷步驟S620所接收的換手請求回應是否有雙連接資訊(步驟S630)。具體而言，諸如fullConfig-r9、輔助細胞群組(Secondary Cell Group，SCG)-組態-r12 (SCG-Confguration-r12)、及新無線電(New Radio，NR)-Config-r15 (nr-Config-r15)、及/或使用者設備(User Equipment，UE)上下文(context)保留(kept)指示(indicator)等資訊元件(Information Element，IE)都是來源基地台410用於判斷是否釋放雙連接組態的雙連接資訊。例如，使用者設備保留指示是來源基地台410用於判斷目標基地台430是否支援雙連接功能且是否保留使用者設備401的輔助節點上下文(關於與輔助基地台420的資源及其他設定)。而處理器416可判斷換手請求回應中的換手指令是否有fullConfig-r9、SCG-Confguration-r12、或nr-Config-r15資訊元件、換手請求回應是否有使用者設備保留指示、及/或這些資訊元件是否有值，以決定是否有雙連接資訊。The processor 416 of the source base station 410 determines whether the handover request response received in step S620 has dual connection information (step S630). Specifically, such as fullConfig-r9, Secondary Cell Group (SCG)-Configuration-r12 (SCG-Confguration-r12), and New Radio (NR)-Config-r15 (nr-Config -r15), and/or User Equipment (UE) context (kept) indication (indicator) and other information elements (Information Element, IE) are used by the source base station 410 to determine whether to release the dual connection Configured dual connection information. For example, the user equipment reservation instruction is used by the source base station 410 to determine whether the target base station 430 supports the dual connectivity function and whether to reserve the auxiliary node context of the user equipment 401 (with regard to resources and other settings with the auxiliary base station 420). The processor 416 can determine whether the handover command in the handover request response includes fullConfig-r9, SCG-Confguration-r12, or nr-Config-r15 information elements, whether the handover request response has a user equipment reservation instruction, and/ Or whether these information components have values to determine whether there is dual connection information.

反應於換手請求回應未有雙連接資訊(例如，使用者設備保留指示、fullConfig-r9、SCG-Confguration-r12、nr-Config-r15或其他雙連接資訊)(或這些資訊元件未有值)，則來源基地台410的處理器416可產生相關於釋放雙連接組態的雙連接資訊，並透過傳送器413傳送包括產生的雙連接資訊的換手指令(步驟S650)。於本實施例中，處理器416可將諸如SCG-Confguration-r12、或nr-Config-r15資訊元件等雙連接資訊中選擇(CHOICE)欄位設為釋放(release) (基於輔助基地台420的類型(例如，SeNB、或SgNB)可能僅使用特定資訊元件；例如，SeNB對應到SCG-Confguration-r12，SgNB對應到nr-Config-r15)。處理器416會將包括釋放雙連接組態的雙連接資訊加入到換手指令，並將此換手指令透過傳送器413傳送給使用者設備401，讓使用者設備401可依據由來源基地台410產生的雙連接資訊來停用或禁用雙連接功能。換句而言，本發明實施例來源基地台410的處理器416會修改傳送到使用者設備401的換手指令，以主動提示使用者設備401可解除與來源基地台410及輔助基地台420的雙連接組態。Reflecting that there is no dual connection information in the response to the handover request (for example, the user device reservation instruction, fullConfig-r9, SCG-Confguration-r12, nr-Config-r15 or other dual connection information) (or these information components have no value) , The processor 416 of the source base station 410 may generate dual connection information related to the release of the dual connection configuration, and transmit a handover command including the generated dual connection information through the transmitter 413 (step S650). In this embodiment, the processor 416 can set the CHOICE field in the dual connection information such as the SCG-Confguration-r12 or nr-Config-r15 information element to release (release) (based on the auxiliary base station 420 The type (for example, SeNB, or SgNB) may only use specific information elements; for example, SeNB corresponds to SCG-Confguration-r12, and SgNB corresponds to nr-Config-r15). The processor 416 adds the dual connection information including the release of the dual connection configuration to the handover command, and transmits the handover command to the user device 401 through the transmitter 413, so that the user device 401 can be based on the source base station 410 The dual connection information is generated to disable or disable the dual connection function. In other words, in the embodiment of the present invention, the processor 416 of the source base station 410 will modify the handover command sent to the user equipment 401 to actively prompt the user equipment 401 to cancel the connection with the source base station 410 and the auxiliary base station 420. Dual connection configuration.

另一方面，假設在其他實施例中，目標基地台430支援雙連接功能，而使來源基地台410接收到來自目標基地台430或行動管理實體440的換手請求回應具有前述雙連接資訊，則來源基地台410的處理器416會透過傳送器413而直接將包括來自目標基地台430換手指令(已包括雙連接資訊)傳送給使用者設備401(步驟640)，而無須自行產生雙連接資訊或修改換手指令。On the other hand, assuming that in other embodiments, the target base station 430 supports the dual connectivity function, and the source base station 410 receives the handover request response from the target base station 430 or the mobile management entity 440 with the aforementioned dual connectivity information, then The processor 416 of the source base station 410 will directly send the handover command (including dual connection information) from the target base station 430 to the user device 401 through the transmitter 413 (step 640), without the need to generate the dual connection information by itself Or modify the handover instruction.

為了方便讀者更加理解本發明實施例之精神，以下將另舉兩實施例說明。In order to facilitate the reader to better understand the spirit of the embodiments of the present invention, two additional embodiments are described below.

圖7是依據本發明一實施例的X2介面換手的信令流程圖。請參照圖7，本實施例的換手行為是基於X2介面。使用者設備401經組態有雙連接功能(步驟S701)，並可與來源基地台410及輔助基地台420連接。使用者設備401會持續傳送量測報告(例如，相關於訊號強度、訊號品質等資運)給來源基地台410(步驟S702)。接著，來源基地台410依據量測報告決定將使用者設備401換手到目標基地台430(步驟S703)，並傳送換手請求(HANDOVER REQUEST)至目標基地台430 (步驟S704)。而此目標基地台430不支援雙連接功能，因此其回送給來源基地台410的換手請求確認(HANDOVER REQUEST ACKNOWLEDGE)將不會包括使用者設備保留指示，且換手請求確認中的換手指令(HANDOVER COMMAND)將不會包括fullConfig-r9、SCG-Confguration-r12、或nr-Config-r15資訊元件(步驟S705)。Fig. 7 is a signaling flowchart of an X2 interface handover according to an embodiment of the present invention. Please refer to FIG. 7, the hand-changing behavior in this embodiment is based on the X2 interface. The user equipment 401 is configured with a dual connection function (step S701), and can be connected to the source base station 410 and the auxiliary base station 420. The user equipment 401 will continuously send measurement reports (for example, information related to signal strength, signal quality, etc.) to the source base station 410 (step S702). Then, the source base station 410 decides to switch the user equipment 401 to the target base station 430 according to the measurement report (step S703), and transmits a handover request (HANDOVER REQUEST) to the target base station 430 (step S704). The target base station 430 does not support the dual connection function, so the handover request confirmation (HANDOVER REQUEST ACKNOWLEDGE) sent back to the source base station 410 will not include the user equipment reservation instruction, and the handover instruction in the handover request confirmation (HANDOVER COMMAND) will not include fullConfig-r9, SCG-Confguration-r12, or nr-Config-r15 information elements (step S705).

若輔助基地台420屬於eNB，則來源基地台410會傳送輔助eNB釋放請求(SeNB RELEASE REQUEST)(步驟S706)；若輔助基地台420屬於gNB，則是輔助gNB釋放請求(SgNB RELEASE REQUEST)被傳送(步驟S707)，且輔助基地台420會傳送gNB釋放請求確認(SgNB RELEASE REQUEST ACKNOWLEDGE)(步驟S708)。另一方面，來源基地台410會判斷換手請求確認(HANDOVER REQUEST ACKNOWLEDGE)是否有使用者設備保留指示資訊元件且HANDOVER REQUEST ACKNOWLEDGE中的HANDOVER COMMAND是否有fullConfig-r9、SCG-Confguration-r12、或nr-Config-r15資訊元件等雙連接資訊(步驟S709)。If the secondary base station 420 belongs to an eNB, the source base station 410 will transmit a secondary eNB release request (SeNB RELEASE REQUEST) (step S706); if secondary base station 420 belongs to a gNB, the secondary gNB release request (SgNB RELEASE REQUEST) will be transmitted (Step S707), and the auxiliary base station 420 will send a gNB release request confirmation (SgNB RELEASE REQUEST ACKNOWLEDGE) (step S708). On the other hand, the source base station 410 will determine whether the handover request confirmation (HANDOVER REQUEST ACKNOWLEDGE) has a user equipment retention indicator information element and whether the HANDOVER COMMAND in the HANDOVER REQUEST ACKNOWLEDGE has fullConfig-r9, SCG-Confguration-r12, or nr -Config-r15 information component and other dual connection information (step S709).

由於本實施例的目標基地台430不支援雙連接功能，因此來源基地台410會基於輔助基地台420的類型(eNB或gNB)產生對應雙連接資訊(例如，SCG-Confguration-r12、或nr-Config-r15等)，並將自行產生的雙連接資訊(指示釋放雙連接組態)加入換手指令(HANDOVER COMMAND)中。來源基地台410將前述修改的換手指令透過無線電資源控制連線重新組態(RRC Connection Reconfiguration)訊息傳送給使用者設備401(步驟S710)。藉此，使用者設備401會依據修改的換手指令來釋放雙連接組態(步驟S711)，此時使用者設備401未受組態有雙連接功能且不繼續監聽輔助基地台420的封包。使用者設備401接著回傳無線電資源控制連線重新組態完成(complete)給目標基地台430(步驟S712)。Since the target base station 430 in this embodiment does not support the dual connectivity function, the source base station 410 will generate corresponding dual connectivity information (for example, SCG-Confguration-r12, or nr- Config-r15, etc.), and add the self-generated dual connection information (instructing to release the dual connection configuration) into the HANDOVER COMMAND. The source base station 410 transmits the modified handover command to the user equipment 401 through an RRC Connection Reconfiguration message (step S710). In this way, the user equipment 401 releases the dual connection configuration according to the modified handover command (step S711). At this time, the user equipment 401 is not configured with the dual connection function and does not continue to monitor the packets of the auxiliary base station 420. The user equipment 401 then returns the radio resource control connection reconfiguration complete (complete) to the target base station 430 (step S712).

圖8是依據本發明一實施例的S1介面換手的信令流程圖。請參照圖8，本實施例的換手行為是基於S1介面。步驟S801、S802、S803、S808~S813及S814可參照圖7的步驟S701、S702、S703、S706~S712的說明，於此不再贅述。與圖7實施例不同之處在於，圖8的來源基地台410與目標基地台430無法透過X2介面傳遞訊息，因此來源基地台410會傳送換手需求(HANDOVER REQUIRED)至行動管理實體440(步驟S804)，且行動管理實體440會發送換手請求(HANDOVER REQUEST)至目標基地台730(步驟S805)。而目標基地台730回傳換手請求確認(HANDOVER REQUEST ACKNOWLEDGE)(因未支援雙連接功能而無fullConfig-r9、SCG-Confguration-r12、或nr-Config-r15資訊元件)給行動管理實體440(步驟S806)。行動管理實體440即將換手請求確認中的換手指令(HANDOVER COMMAND)傳送給來源基地台410(步驟S807)。此外，在步驟S811中，來源基地台410僅需要判斷來自行動管理實體440的換手指令是否有fullConfig-r9、SCG-Confguration-r12、或nr-Config-r15資訊元件等雙連接資訊。若沒有雙連接資訊，則來源基地台410會直接將修改的換手指令(包括釋放雙連接組態的雙連接資訊)透過無線電資源控制連線重新組態傳送給使用者設備401(步驟S812)，讓使用者設備401同樣可解決與輔助基地台420之間的雙連接功能(步驟S813)。Fig. 8 is a signaling flow chart of S1 interface handover according to an embodiment of the present invention. Please refer to FIG. 8, the hand-changing behavior in this embodiment is based on the S1 interface. Steps S801, S802, S803, S808~S813, and S814 can refer to the description of steps S701, S702, S703, S706~S712 in FIG. 7, which will not be repeated here. The difference from the embodiment in FIG. 7 is that the source base station 410 and the target base station 430 in FIG. 8 cannot transmit messages through the X2 interface, so the source base station 410 sends a handover request (HANDOVER REQUIRED) to the mobile management entity 440 (step S804), and the mobile management entity 440 will send a handover request (HANDOVER REQUEST) to the target base station 730 (step S805). The target base station 730 returns a handover request confirmation (HANDOVER REQUEST ACKNOWLEDGE) (due to the lack of dual-connection support without fullConfig-r9, SCG-Confguration-r12, or nr-Config-r15 information components) to the mobile management entity 440 ( Step S806). The mobile management entity 440 transmits the handover command (HANDOVER COMMAND) in the handover request confirmation to the source base station 410 (step S807). In addition, in step S811, the source base station 410 only needs to determine whether the handover command from the mobile management entity 440 has dual connection information such as fullConfig-r9, SCG-Confguration-r12, or nr-Config-r15 information element. If there is no dual connection information, the source base station 410 will directly send the modified handover command (including the dual connection information for releasing the dual connection configuration) to the user equipment 401 through the radio resource control connection reconfiguration (step S812) , So that the user equipment 401 can also solve the dual connection function with the auxiliary base station 420 (step S813).

綜上所述，本發明實施例的基地台及其換手控制方法，反應於目標基地台未支援雙連接功能，透過修改發送給使用者設備的換手指令，讓使用者設備能據以釋放雙連接組態。藉此，使用者設備將不再繼續監聽是否有來自輔助基地台的封包，從而節省電力。此外，目標基地台不用擔心資源組態有衝突，且能提供合適資源組態給使用者設備，並維持資料傳輸及服務。To sum up, the base station and its handover control method in the embodiments of the present invention reflect that the target base station does not support the dual connection function. By modifying the handover command sent to the user equipment, the user equipment can be released accordingly. Dual connection configuration. In this way, the user equipment will no longer continue to monitor whether there are packets from the auxiliary base station, thereby saving power. In addition, the target base station does not need to worry about resource configuration conflicts, and can provide appropriate resource configuration to user equipment, and maintain data transmission and services.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

1:系統MBS、SBS:基地台UE、401:使用者設備BSS、410:來源基地台BST、430:目標基地台MME、440:行動管理實體X2、S1:介面4:通訊系統411:天線412:接收器413:傳送器414:類比/數位-數位/類比轉換器415:儲存器416:處理器420:輔助基地台S301~S306、S610~S650、S701~S712、S801~S814:步驟1: System MBS, SBS: Base Station UE, 401: User Equipment BSS, 410: Source Base Station BST, 430: Target Base Station MME, 440: Mobile Management Entity X2, S1: Interface 4: Communication System 411: Antenna 412 : Receiver 413: Transmitter 414: Analog/digital-digital/analog converter 415: Storage 416: Processor 420: Auxiliary base station S301~S306, S610~S650, S701~S712, S801~S814: Steps

圖1是習知雙連接系統架構圖。 圖2是一範例說明習知換手情境。 圖3是習知換手行為的信令流程圖。 圖4是依據本發明一實施例的通訊系統的示意圖。 圖5是依據本發明一實施例的來源基地台的元件方塊圖。 圖6是依據本發明一實施例的換手控制方法的流程圖。 圖7是依據本發明一實施例的X2介面換手的信令流程圖。 圖8是依據本發明一實施例的S1介面換手的信令流程圖。Figure 1 is an architecture diagram of a conventional dual-connection system. Figure 2 is an example to illustrate the situation of changing hands. Figure 3 is a signaling flow chart of the conventional handover behavior. Fig. 4 is a schematic diagram of a communication system according to an embodiment of the present invention. FIG. 5 is a block diagram of components of a source base station according to an embodiment of the invention. Fig. 6 is a flowchart of a handover control method according to an embodiment of the present invention. Fig. 7 is a signaling flowchart of an X2 interface handover according to an embodiment of the present invention. Fig. 8 is a signaling flow chart of S1 interface handover according to an embodiment of the present invention.

S610~S650:步驟 S610~S650: steps

Claims (10)

一種換手(handover)控制方法，適用於支援雙連接(Dual Connectivity，DC)技術的一基地台，包括： 傳送一換手請求； 接收一換手請求回應，其中該換手請求回應對應於該換手請求； 判斷該換手請求回應是否有一雙連接資訊；以及 反應於該換手請求回應未有該雙連接資訊，產生相關於釋放雙連接組態(configuration)的該雙連接資訊，並傳送包括該雙連接資訊的一換手指令，其中該換手指令對應於該換手請求回應。A handover control method, applicable to a base station supporting Dual Connectivity (DC) technology, includes: transmitting a handover request; receiving a handover request response, wherein the handover request response corresponds to the Handover request; Determine whether the handover request response has a pair of connection information; and in response to the fact that the handover request response does not have the dual connection information, generate the dual connection information related to the release of the dual connection configuration (configuration), and send it A handover command including the dual connection information, wherein the handover command corresponds to the handover request response. 如申請專利範圍第1項所述的換手控制方法，其中該雙連接資訊包括一fullConfig-r9、一輔助細胞群組(Secondary Cell Group，SCG)-組態-r12 (SCG-Confguration-r12)、及一新無線電(New Radio，NR)-Config-r15 (nr-Config-r15)資訊元件(Information Element，IE)中的至少一者。The handover control method described in item 1 of the patent application, wherein the dual connection information includes a fullConfig-r9, a secondary cell group (Secondary Cell Group, SCG)-configuration-r12 (SCG-Confguration-r12) , And at least one of New Radio (NR)-Config-r15 (nr-Config-r15) Information Element (IE). 如申請專利範圍第2項所述的換手控制方法，其中該換手請求回應包括該換手指令，而判斷該換手請求回應是否有該雙連接資訊的步驟包括： 判斷該換手請求回應中的該換手指令是否有該fullConfig-r9、該SCG-Confguration-r12、或該nr-Config-r15資訊元件或該些資訊元件是否有值，以決定是否有該雙連接資訊。For example, in the handover control method described in item 2 of the scope of patent application, the handover request response includes the handover instruction, and the step of determining whether the handover request response has the dual connection information includes: determining the handover request response Whether there is the fullConfig-r9, the SCG-Confguration-r12, or the nr-Config-r15 information element in the handover command or whether the information elements have values to determine whether there is the dual connection information. 如申請專利範圍第2項所述的換手控制方法，其中產生相關於釋放雙連接組態的該雙連接資訊的步驟包括： 將該SCG-Confguration-r12、或該nr-Config-r15資訊元件中的選擇(choice)欄位設為釋放。The handover control method described in item 2 of the scope of patent application, wherein the step of generating the dual connection information related to the release of the dual connection configuration includes: the SCG-Confguration-r12 or the nr-Config-r15 information element The choice field in is set to release. 如申請專利範圍第1項所述的換手控制方法，其中該雙連接資訊是使用者設備(User Equipment，UE)上下文(context)保留(kept)指示(indicator)資訊元件。For the handover control method described in item 1 of the scope of patent application, the dual connection information is a user equipment (UE) context (kept) indication (indicator) information element. 一種基地台，支援雙連接技術，並包括： 一傳送器，傳送訊號； 一接收器，接收訊號： 一處理器，耦接該傳送器及該接收器，並經組態用以執行：       透過該傳送器傳送一換手請求；       透過該接收器接收一換手請求回應，其中該換手請求回應對應於該換手請求；       判斷該換手請求回應是否有一雙連接資訊；以及       反應於該換手請求回應未有該雙連接資訊，產生相關於釋放雙連接組態的該雙連接資訊，並透過該傳送器傳送包括該雙連接資訊的一換手指令，其中該換手指令對應於該換手請求回應。A base station that supports dual connection technology and includes: a transmitter, which transmits signals; a receiver, which receives signals: a processor, coupled to the transmitter and the receiver, and configured to perform: through the The transmitter sends a handover request; receives a handover request response through the receiver, where the handover request response corresponds to the handover request; determines whether the handover request response has a pair of connection information; and the response is to the handover The request response does not have the dual connection information, the dual connection information related to the release of the dual connection configuration is generated, and a handover command including the dual connection information is sent through the transmitter, wherein the handover command corresponds to the handover Request a response. 如申請專利範圍第6項所述的基地台，其中該雙連接資訊包括一fullConfig-r9、一SCG-Confguration-r12、及一nr-Config-r15資訊元件中的至少一者。As for the base station described in item 6 of the scope of patent application, the dual connection information includes at least one of a fullConfig-r9, an SCG-Confguration-r12, and an nr-Config-r15 information element. 如申請專利範圍第7項所述的基地台，其中該換手請求回應包括該換手指令，而該處理器更經配置用以執行： 判斷該換手請求回應中的該換手指令是否有該fullConfig-r9、該SCG-Confguration-r12、或該nr-Config-r15資訊元件或該些資訊元件是否有值，以決定是否有該雙連接資訊。For example, in the base station described in item 7 of the scope of patent application, the handover request response includes the handover command, and the processor is further configured to execute: determine whether the handover command in the handover request response has Whether the fullConfig-r9, the SCG-Confguration-r12, or the nr-Config-r15 information element or the information elements has a value to determine whether there is the dual connection information. 如申請專利範圍第7項所述的基地台，其中該處理器更經配置用以執行： 將該SCG-Confguration-r12、或該nr-Config-r15資訊元件中的選擇欄位設為釋放。For the base station described in item 7 of the scope of patent application, the processor is further configured to execute: set the selection field in the SCG-Confguration-r12 or the nr-Config-r15 information element to release. 如申請專利範圍第6項所述的基地台，其中該雙連接資訊是使用者設備上下文保留指示資訊元件。For the base station described in item 6 of the scope of the patent application, the dual connection information is a user equipment context retention indicator information element.
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Citations (1)

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US20170318504A1 (en) * 2014-10-30 2017-11-02 Nokia Solutions And Networks Oy Control of communication using dual-connectivity mode description

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US20170318504A1 (en) * 2014-10-30 2017-11-02 Nokia Solutions And Networks Oy Control of communication using dual-connectivity mode description

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3GPP, "Technical Specification; 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 15)" , 3GPP TS 36.300 V15.3.0, 2018-09 *

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