CN102223669A - Method and system for creating data inverse-transmitting channel and distributing internet protocol - Google Patents
Method and system for creating data inverse-transmitting channel and distributing internet protocolDownload PDFInfo
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Abstract
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Description
Translated fromChinese技术领域technical field
本发明涉及长期演进(Long-Term Evolution，简称为LTE)无线通信领域，具体而言，涉及一种LTE无线通信领域中的创建数据反传通道和分配IP的方法及系统。The present invention relates to the field of Long-Term Evolution (LTE for short) wireless communication, in particular, to a method and system for creating a data back-transmission channel and allocating IP in the field of LTE wireless communication.
背景技术Background technique
移动性管理是移动通信系统的一个重要属性，而切换就是移动性管理的关键内容，合理的切换操作可以减少用户终端(User Equipment，简称为UE)掉话的可能性，减少业务数据中断，提高系统稳定性和用户感受。Mobility management is an important attribute of a mobile communication system, and handover is the key content of mobility management. Reasonable handover operations can reduce the possibility of user equipment (UE) drop calls, reduce service data interruption, and improve System stability and user experience.
在长期演进(LTE)系统中，用户终端(UE)的状态分为连接态(RRC_CONNECTED)和空闲态(RRC_IDLE)两种。当处于RRC_CONNECTED状态下的UE从服务小区移动到了另一个小区时，就会触发越区切换(handover)，以保证业务的不中断。In the Long Term Evolution (LTE) system, the state of the user terminal (UE) is divided into two types: a connected state (RRC_CONNECTED) and an idle state (RRC_IDLE). When the UE in the RRC_CONNECTED state moves from the serving cell to another cell, a handover will be triggered to ensure uninterrupted services.
当UE从一个基站(eNB)的小区切换到另一个eNB的小区时，就会触发跨基站的切换。如果切换源基站和切换目标基站之间存在X2接口(X2 Interface)并且与同一MME相连时，根据现有技术(3GPP协议，23.401)，源eNB将会发起经过X2接口的切换(X2 InterfaceHandover)，否则将发起经过S1接口的切换(S1 Interface Handover)。An inter-base station handover is triggered when a UE is handed over from a cell of one base station (eNB) to a cell of another eNB. If there is an X2 interface (X2 Interface) between the handover source base station and the handover target base station and is connected to the same MME, according to the existing technology (3GPP protocol, 23.401), the source eNB will initiate a handover through the X2 interface (X2 InterfaceHandover), Otherwise, a handover via the S1 interface (S1 Interface Handover) will be initiated.
为了减少S1切换过程中业务数据的中断，3GPP引入了数据反传技术(data forwarding)，即源eNB在切换执行时将还未来得及下发给UE的下行数据和UE上发的还未能按序投递到核心网的AM模式上行数据反传到目标eNB，并将PDCP序列号信息通过信令传给目标eNB，由目标eNB对反传过来的上下行数据包进行投递。源eNB根据切换UE已建立的各个业务的业务属性来决定是否需要对该业务数据进行数据反传并将该信息通过信令带给核心网和目标eNB。In order to reduce the interruption of service data during the S1 handover process, 3GPP introduced the data forwarding technology (data forwarding), that is, the source eNB will transmit the downlink data that has not yet been sent to the UE and the data that has not yet been sent by the UE when the handover is performed. The AM mode uplink data delivered to the core network is reversely transmitted to the target eNB, and the PDCP sequence number information is transmitted to the target eNB through signaling, and the target eNB delivers the reversely transmitted uplink and downlink data packets. The source eNB decides whether to perform data backtransmission on the service data according to the service attribute of each service established by the handover UE, and sends the information to the core network and the target eNB through signaling.
如果源eNB与目标eNB之间存在X2偶联，则进行直接路径反传，即源eNB直接将反传数据发送到目标eNB，否则进行非直接路径反传，即源eNB将反传数据发送到核心网，再由核心网将反传数据转发给目标eNB。反传路径由源eNB决定，并通过S1口信令中的直接路径反传标志带给核心网，核心网根据直接路径反传标志来决定是否需要实施非直接路径反传。If there is an X2 coupling between the source eNB and the target eNB, direct path backtransmission is performed, that is, the source eNB directly sends the backtransmission data to the target eNB, otherwise, an indirect path backtransmission is performed, that is, the source eNB sends the backtransmission data to The core network, and then the core network forwards the backhaul data to the target eNB. The backhaul path is determined by the source eNB and brought to the core network through the direct path backhaul flag in the S1 interface signaling. The core network decides whether to implement the non-direct path backhaul flag according to the direct path backhaul flag.
为了接收反传数据，目标eNB需要为切入UE需要数据反传的每个业务(ERAB)分配反传路径IP，并将IP通过S1口信令传给核心网。如果进行直接路径反传，核心网将目标eNB的IP直接发送给源eNB，源eNB直接将反传数据发送到目标eNB；如果进行非直接路径反传，核心网将目标eNB的IP保存，并在核心网侧给需要反传的业务分配反传IP，将该IP发送给源eNB，源eNB将反传数据发送到核心网，核心网将反传数据转发给目标eNB。In order to receive back-transmission data, the target eNB needs to allocate a back-transmission path IP for each service (ERAB) that needs to be back-transmitted to the UE, and transmit the IP to the core network through S1 port signaling. If direct path backtransmission is performed, the core network will directly send the IP of the target eNB to the source eNB, and the source eNB will directly send the backtransmission data to the target eNB; if non-direct path backtransmission is performed, the core network will save the IP of the target eNB, and On the core network side, the reverse transmission IP is assigned to the service that needs reverse transmission, and the IP is sent to the source eNB. The source eNB sends the reverse transmission data to the core network, and the core network forwards the reverse transmission data to the target eNB.
虚拟局域网(Virtual Local Area Network，简称为VLAN)技术是指在传输网络中，将物理上的一个传输网络分成多个虚拟局域网，各个虚拟局域网之间进行隔离，不能相互访问。从而避免网络中出现的广播风暴，同时起到各个虚拟局域网之间的数据安全和保密作用。Virtual local area network (Virtual Local Area Network, referred to as VLAN) technology refers to the division of a physical transmission network into multiple virtual local area networks in the transmission network, and each virtual local area network is isolated and cannot be accessed each other. In this way, the broadcast storm in the network can be avoided, and at the same time, it can play the role of data security and confidentiality among various virtual local area networks.
eNodeB在接收到带有VLAN标签的数据报文后，根据VLAN ID判断该报文属于那个子接口。报文被送出网元时，根据路由查询后，确定出网元的接口号，此时会封装该子接口所对应的VLAN ID。通过对收发报文打标签，根据标签的VLAN ID不同，进行报文的区分，达到通过一个实接口收发多种报文的目的。After receiving a data packet with a VLAN tag, the eNodeB judges which sub-interface the packet belongs to according to the VLAN ID. When the message is sent out of the network element, the interface number of the network element is determined according to the routing query, and the VLAN ID corresponding to the sub-interface will be encapsulated at this time. By tagging the sending and receiving messages, and distinguishing the messages according to the different VLAN IDs of the tags, the purpose of sending and receiving multiple messages through one real interface is achieved.
LTE eNodeB存在S1/MP/X2连接。考虑到分组交换核心网(Packet Switched Core，简称为PS Core)PS Core(简称EPC)与操作维护中心(Operation Management Center，简称为OMC)网络部署上大多数情况下都部署在一个机房中，故考虑S1/MP单独划分一个VLAN，对X2口单独划分另一个VLAN，使得处于同一个L2传输网络的基站之间通信的报文不用上L3进行路由转发。LTE eNodeB has S1/MP/X2 connections. Considering that the Packet Switched Core (PS Core for short) PS Core (EPC for short) and Operation Management Center (OMC for short) network deployment are mostly deployed in one computer room, so Consider dividing one VLAN separately for S1/MP, and another VLAN for X2 interface, so that the packets communicated between base stations on the same L2 transmission network do not need to be routed and forwarded on L3.
在S1口和X2口划分为不同VLAN的情况下，eNB的S1口和X2口之间不能相互访问，相当于虚拟的两个不同的网络。因此，如果eNB在X2口分配了IP并在X2口上建立通道等待接收数据，而数据从S1接口上传入eNB，则eNB将接收不到。When the S1 port and the X2 port are divided into different VLANs, the S1 port and the X2 port of the eNB cannot communicate with each other, which is equivalent to two different virtual networks. Therefore, if the eNB allocates an IP on the X2 port and establishes a channel on the X2 port to receive data, and the data is transmitted to the eNB from the S1 interface, the eNB will not receive it.
然而，相关技术中并未涉及目标eNB如何得知切换时数据反传的路径是直接反传还是非直接反传，因此目标eNB无法确定通过S1口还是X2口建立数据反传通道，也无法确定反传通道的IP是分配S1口的VLAN中的IP还是X2口的VLAN中的IP。这将会导致S1切换时数据反传无法正常进行，引起切换时的数据丢包和业务中断。However, the relevant technology does not involve how the target eNB knows whether the data back-transmission path is direct back-transmission or indirect back-transmission during handover, so the target eNB cannot determine whether to establish a data back-transmission channel through the S1 port or the X2 port. Is the IP of the backhaul channel assigned to the IP in the VLAN of the S1 port or the IP in the VLAN of the X2 port. This will result in the failure of data backtransmission during S1 switchover, causing data packet loss and service interruption during switchover.
发明内容Contents of the invention
针对相关技术中S1切换时数据反传无法正常进行，引起切换时的数据丢包和业务中断的问题，本发明提供了一种创建数据反传通道和分配IP的方法及系统，以解决上述问题至少之一。Aiming at the problem in the related art that data backtransmission cannot be performed normally during S1 switching, causing data packet loss and service interruption during switching, the present invention provides a method and system for creating a data backtransmission channel and assigning IP to solve the above problems at least one.
根据本发明的一个方面，提供了一种创建数据反传通道和分配IP的方法。According to one aspect of the present invention, a method for creating a data reverse transmission channel and allocating IP is provided.
根据本发明的IP分配方法包括：在执行S1切换过程中，目标基站接收来自于核心网的切换请求消息，其中，所述核心网将是否是直接路径反传的第一标识携带在所述切换请求消息中；目标基站按照第一标识创建数据反传通道并分配IP。The IP allocation method according to the present invention includes: during the process of performing S1 handover, the target base station receives a handover request message from the core network, wherein the core network carries the first identifier of whether direct path inversion is carried in the handover In the request message: the target base station creates a data reverse transmission channel and allocates an IP according to the first identifier.
在上述目标基站接收来自于核心网的切换请求消息之前，还包括：源基站确定执行S1切换后，所述核心网接收来自于所述源基站的切换需求消息，其中，所述切换需求消息携带有是否是直接路径反传的第二标识；所述核心网根据所述第二标识将所述第一标识携带在所述切换请求消息中发送。Before the target base station receives the handover request message from the core network, it also includes: after the source base station determines to perform S1 handover, the core network receives a handover request message from the source base station, wherein the handover request message carries There is a second identifier indicating whether it is direct path backpropagation; the core network carries the first identifier in the handover request message and sends it according to the second identifier.
上述核心网根据所述第二标识将所述第一标识携带在所述切换请求消息中发送包括：如果所述核心网中的MME不需要改变，则该MME根据所述第二标识在所述切换请求消息中增加所述第一标识，并将增加所述第一标识后的所述切换请求消息发送至所述目标基站；如果所述核心网中的MME需要改变，则源MME根据所述第二标识在前转切换请求消息中增加是否是直接路径反传的第三标识，并将增加所述第三标识后的所述前转切换请求消息发送至目标MME，所述目标MME根据所述第三标识在所述切换请求消息中增加所述第一标识，并将增加所述第一标识后的所述切换请求消息发送至所述目标基站。The above-mentioned sending of the core network carrying the first identifier in the handover request message according to the second identifier includes: if the MME in the core network does not need to be changed, then the MME in the Add the first identifier in the handover request message, and send the handover request message with the first identifier added to the target base station; if the MME in the core network needs to be changed, the source MME The second identifier adds a third identifier of whether the forwarding handover request message is direct path backhaul in the forwarding handover request message, and sends the forwarding handover request message with the third identifier added to the target MME, and the target MME according to the adding the first identifier to the handover request message with the third identifier, and sending the handover request message with the first identifier added to the target base station.
通过以下之一方式在上述切换请求消息中增加所述第一标识或在所述前转切换请求消息中增加所述第三标识：增加承载所述第一标识或所述第三标识的信元；使用当前信元中的保留字段来承载所述第一标识或第三标识。Adding the first identifier to the handover request message or adding the third identifier to the forwarding handover request message in one of the following ways: adding an information element carrying the first identifier or the third identifier ; Use a reserved field in the current cell to bear the first identifier or the third identifier.
上述目标基站按照所述第一标识创建数据反传通道并分配IP包括：如果所述第一标识指示是直接路径反传，则通过X2口建立数据反传通道，并为反传数据分配X2口VLAN的IP；如果所述第一标识指示不是直接路径反传，则通过S1口建立数据反传通道，并为反传数据分配S1口VLAN的IP。The above-mentioned target base station creates a data back-transmission channel according to the first identification and assigns an IP including: if the first identification indicates a direct path back-transmission, then establishes a data back-transmission channel through the X2 port, and allocates the X2 port for the back-transmission data The IP of the VLAN; if the first identifier indicates that it is not a direct path back-transmission, then establish a data back-transmission channel through the S1 port, and allocate the VLAN IP of the S1 port for the back-transmission data.
上述目标基站按照所述标识创建数据反传通道并分配IP之后，还包括：所述目标基站向所述核心网发送切换请求确认消息，其中，所述切换请求确认消息中携带有所述分配的IP。After the above-mentioned target base station creates a data back-transmission channel according to the identifier and allocates an IP, it further includes: the target base station sends a handover request confirmation message to the core network, wherein the handover request confirmation message carries the allocated IP.
根据本发明的另一方面，提供了一种创建数据反传通道和分配IP的系统。According to another aspect of the present invention, a system for creating a data return channel and allocating IP is provided.
根据本发明的IP分配系统包括：核心网，包括：扩展模块，用于在切换请求消息中携带是否是直接路径反传的第一标识；目标基站；目标基站包括：第一接收模块，用于在执行S1切换过程中，接收来自于核心网的切换请求消息，其中，切换请求消息中携带有是否是直接路径反传的第一标识；处理模块，用于按照第一标识创建数据反传通道并分配IP。The IP distribution system according to the present invention includes: a core network, including: an extension module, used to carry a first identifier of whether the direct path backtransmission is carried in the handover request message; the target base station; the target base station includes: a first receiving module, used for In the process of performing S1 handover, a handover request message from the core network is received, wherein the handover request message carries a first identifier of whether it is a direct path reverse transmission; a processing module is used to create a data reverse transmission channel according to the first identifier And assign IP.
上述系统还包括：源基站，包括：判决模块，用于判决是否需要执行S1切换；第一发送模块，用于发送切换需求消息，其中，所述切换需求消息携带有是否是直接路径反传的第二标识；则所述核心网包括：第二接收模块，用于在源基站确定执行S1切换后，接收来自于所述源基站的所述切换需求消息；第二发送模块，用于根据所述第二标识将所述第一标识携带在所述切换请求消息中发送。The above system also includes: a source base station, including: a judging module for judging whether S1 handover needs to be performed; a first sending module for sending a handover request message, wherein the handover request message carries a direct path reverse transmission second identifier; then the core network includes: a second receiving module, configured to receive the handover request message from the source base station after the source base station determines to perform S1 handover; a second sending module, configured to receive the handover requirement message from the source base station according to the The second identifier carries the first identifier in the handover request message and sends it.
上述处理模块包括；判断单元，用于判断所述第一标识是否指示直接路径反传；处理单元，用于在所述判断单元输出为是时，通过X2口建立数据反传通道，并为反传数据分配X2口VLAN的IP；在所述判断单元输出为否时，通过S1口建立数据反传通道，并为反传数据分配S1口VLAN的IP。The above-mentioned processing module includes; a judging unit for judging whether the first identifier indicates direct path back-transmission; a processing unit for establishing a data back-transmission channel through the X2 port when the output of the judging unit is yes; The IP of the VLAN of the X2 port is allocated for data transmission; when the output of the judgment unit is negative, a data back-transmission channel is established through the S1 port, and the IP of the VLAN of the S1 port is allocated for the back-transmission data.
上述目标基站还包括；第三发送模块，用于向所述核心网发送切换请求确认消息，其中，所述切换请求确认消息中携带有所述分配的IP。The above target base station further includes; a third sending module, configured to send a handover request confirmation message to the core network, wherein the handover request confirmation message carries the allocated IP.
通过本发明，核心网将是否是直接路径反传的标识携带在切换请求消息中发送给目标基站，目标基站按照该标识创建数据反传通道并分配IP。解决了相关技术中S1切换时数据反传无法正常进行，引起切换时的数据丢包和业务中断的问题，进而可以保证S1切换时数据反传正常进行，避免出现切换时的数据丢包和业务中断情况。Through the present invention, the core network carries the identifier of whether direct path backtransmission is carried in the handover request message and sends it to the target base station, and the target base station creates a data backtransmission channel and allocates IP according to the identifier. It solves the problem that data backtransmission cannot be performed normally during S1 switching in the related technology, which causes data packet loss and service interruption during switching, and then can ensure that data backtransmission is normal during S1 switching, avoiding data packet loss and business interruption during switching Outage situation.
附图说明Description of drawings
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:
图1是根据本发明实施例的创建数据反传通道和分配IP的方法的流程图；Fig. 1 is a flowchart of a method for creating a data reverse transmission channel and assigning an IP according to an embodiment of the present invention;
图2是根据本发明优选实施例一的创建数据反传通道和分配IP的方法的流程图；Fig. 2 is a flowchart of a method for creating a data reverse transmission channel and assigning an IP according to a
图3是根据本发明优选实施例一的发生S1切换的UE、切换源eNB、目标eNB、MME和S-GW的接口关系图；Fig. 3 is an interface relationship diagram of UE, handover source eNB, target eNB, MME and S-GW where S1 handover occurs according to
图4是根据本发明优选实施例二的创建数据反传通道和分配IP的方法的流程图；Fig. 4 is a flowchart of a method for creating a data reverse transmission channel and assigning an IP according to the second preferred embodiment of the present invention;
图5是根据本发明优选实施例二的发生跨MME的S1切换(S-GW不改变)的UE、切换源eNB、目标eNB、切换源MME、目标MME和S-GW的接口关系图；Fig. 5 is an interface relationship diagram of UE, handover source eNB, target eNB, handover source MME, target MME, and S-GW where cross-MME S1 handover occurs (S-GW does not change) according to
图6是根据本发明实施例的创建数据反传通道和分配IP的系统的结构框图；Fig. 6 is a structural block diagram of a system for creating a data reverse transmission channel and assigning IP according to an embodiment of the present invention;
图7是根据本发明优选实施例的创建数据反传通道和分配IP的系统的结构框图。Fig. 7 is a structural block diagram of a system for creating a data reverse transmission channel and allocating IP according to a preferred embodiment of the present invention.
具体实施方式Detailed ways
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
图1是根据本发明实施例的创建数据反传通道和分配IP的方法的流程图。如图1所示，该创建数据反传通道和分配IP的方法主要包括以下处理：Fig. 1 is a flow chart of a method for creating a data back-transmission channel and assigning an IP according to an embodiment of the present invention. As shown in Figure 1, the method for creating a data return channel and assigning an IP mainly includes the following processes:
步骤S102：在执行S1切换过程中，目标基站接收来自于核心网的切换请求消息，其中，核心网将是否是直接路径反传的第一标识携带在切换请求消息中；Step S102: During the process of performing S1 handover, the target base station receives a handover request message from the core network, wherein the core network carries the first identifier of whether direct path inversion is carried in the handover request message;
步骤S104：目标基站按照第一标识创建数据反传通道并分配IP。Step S104: The target base station creates a data back-transmission channel according to the first identifier and allocates an IP.
相关技术中并未涉及目标eNB如何得知切换时数据反传的路径是直接反传还是非直接反传，因此目标eNB无法确定通过S1口还是X2口建立数据反传通道，也无法确定反传通道的IP是分配S1口的VLAN中的IP还是X2口的VLAN中的IP。这将会导致S1切换时数据反传无法正常进行，引起切换时的数据丢包和业务中断。图1所示的方法中，核心网将是否是直接路径反传的标识携带在切换请求消息中发送给目标基站，目标基站按照该标识创建数据反传通道并分配IP。解决了上述技术问题，进而可以保证S1切换时数据反传正常进行，避免出现切换时的数据丢包和业务中断情况。The relevant technology does not involve how the target eNB knows whether the data back-transmission path is direct back-transmission or indirect back-transmission during handover, so the target eNB cannot determine whether to establish a data back-transmission channel through the S1 port or the X2 port, nor can it determine the back-transmission path Is the IP of the channel assigned to the IP in the VLAN of the S1 port or the IP in the VLAN of the X2 port. This will result in the failure of data backtransmission during S1 switchover, causing data packet loss and service interruption during switchover. In the method shown in FIG. 1 , the core network carries the identifier of whether direct path backtransmission is carried in the handover request message and sends it to the target base station, and the target base station creates a data backtransmission channel and allocates an IP according to the identifier. The above-mentioned technical problems are solved, and then data backtransmission can be ensured normally during S1 switching, and data packet loss and service interruption during switching can be avoided.
优选地，在执行步骤S102之前，还可以包括以下处理：Preferably, before performing step S102, the following processing may also be included:
(1)源基站确定执行S1切换后，核心网接收来自于源基站的切换需求消息，其中，切换需求消息携带有是否是直接路径反传的第二标识；(1) After the source base station determines to perform S1 handover, the core network receives a handover request message from the source base station, wherein the handover request message carries a second identifier indicating whether direct path inversion is carried;
(2)核心网根据第二标识将第一标识携带在切换请求消息中发送。(2) The core network carries the first identifier in the handover request message and sends it according to the second identifier.
在优选实施过程中，源基站(源eNB)判决需要进行S1切换，通过S1口给核心网发送切换需求(Handover Required)消息，该切换需求消息包括但不限于移动性触发的切换。Handover Required消息中包括但不限于UE的RRC上下文、UE能力以及直接路径反传标志(Direct Forwarding Path Availability)。In the preferred implementation process, the source base station (source eNB) determines that S1 handover is required, and sends a handover required (Handover Required) message to the core network through the S1 interface, and the handover required message includes but is not limited to mobility-triggered handover. The Handover Required message includes, but is not limited to, the UE's RRC context, UE capabilities, and Direct Forwarding Path Availability.
优选地，上述核心网根据第二标识将第一标识携带在切换请求消息中发送包括以下处理：Preferably, the core network sending the first identifier in the handover request message according to the second identifier includes the following processing:
如果核心网中的MME不需要改变，则该MME根据第二标识在切换请求消息中增加第一标识，并将增加第一标识后的切换请求消息发送至目标基站；If the MME in the core network does not need to be changed, the MME adds the first identifier in the handover request message according to the second identifier, and sends the handover request message after adding the first identifier to the target base station;
如果核心网中的MME需要改变，则源MME根据第二标识在前转切换请求消息中增加是否是直接路径反传的第三标识，并将增加第三标识后的前转切换请求消息发送至目标MME，目标MME根据第三标识在切换请求消息中增加第一标识，并将增加第一标识后的切换请求消息发送至目标基站。If the MME in the core network needs to be changed, the source MME adds a third identifier of whether the forwarding handover request message is a direct path inversion according to the second identifier, and sends the forwarding handover request message after adding the third identifier to The target MME, the target MME adds the first identifier to the handover request message according to the third identifier, and sends the handover request message with the first identifier added to the target base station.
优选地，可以通过以下之一方式在切换请求消息中增加上述第一标识或在前转切换请求消息中增加上述第三标识：Preferably, the above-mentioned first identifier can be added to the handover request message or the above-mentioned third identifier can be added to the forwarding handover request message in one of the following ways:
(1)增加承载第一标识或第三标识的信元；(1) adding a cell carrying the first or third identifier;
(2)使用当前信元中的保留字段来承载第一标识或第三标识。(2) Use a reserved field in the current cell to bear the first identifier or the third identifier.
在优选实施过程中，核心网可以根据切换请求(Handover Required)消息中的信元填写Handover Request消息，具体可以分两种情况：(1)如果MME不需要改变，MME根据Handover Required消息中的是否是直接路径反传的标识填写Handover Request消息中的是否是直接路径反传的标识，将Handover Request消息通过S1口发送给目标eNB。(2)如果MME需要改变，源MME根据Handover Required消息中的是否是直接路径反传的标识填写Forward Relocation Request消息中的是否是直接路径反传的标识，将Forward RelocationRequest消息通过S10口发送给目标MME，目标MME根据Forward Relocation Request消息中的直接路径反传标识填写Handover Request消息中的是否是直接路径反传的标识，将Handover Request消息通过S1口发送给目标eNB。In the preferred implementation process, the core network can fill in the Handover Request message according to the information element in the Handover Required message, which can be divided into two cases: (1) if the MME does not need to be changed, the MME can fill in the Handover Request message according to the information in the Handover Required message. It is the identifier of the direct path reverse transmission Fill in the Handover Request message whether it is the identifier of the direct path reverse transmission, and send the Handover Request message to the target eNB through the S1 port. (2) If the MME needs to be changed, the source MME fills in the identifier of whether it is a direct path reverse transmission in the Forward Relocation Request message according to whether the Handover Required message indicates whether it is a direct path reverse transmission, and sends the Forward RelocationRequest message to the target through the S10 port MME, the target MME fills in the Handover Request message whether it is a direct path backhaul identifier according to the direct path backhaul identifier in the Forward Relocation Request message, and sends the Handover Request message to the target eNB through the S1 interface.
其中，可以在Handover Request消息或Forward Relocation Request消息中增加直接路径反传标识信元，或者使用现有的信元(即上述当前信元)中的保留字段来承载是否是直接路径反传的标识。Wherein, it is possible to add the direct path inversion identification cell in the Handover Request message or the Forward Relocation Request message, or use the reserved field in the existing cell (that is, the above-mentioned current cell) to carry the identification of whether the direct path inversion .
优选地，上述步骤S104可以进一步包括：Preferably, the above step S104 may further include:
(1)如果第一标识指示是直接路径反传，则通过X2口建立数据反传通道，并为反传数据分配X2口VLAN的IP；(1) If the first identification indicates direct path backtransmission, then establish a data backtransmission channel through the X2 port, and assign the IP of the X2 port VLAN for the backtransmission data;
(2)如果第一标识指示不是直接路径反传，则通过S1口建立数据反传通道，并为反传数据分配S1口VLAN的IP。(2) If the first identification indicates that it is not a direct path back-transmission, then establish a data back-transmission channel through the S1 port, and allocate the IP of the VLAN of the S1 port for the back-transmission data.
优选地，在目标基站按照标识创建数据反传通道并分配IP之后，目标基站需要向核心网发送切换响应消息，其中，切换响应消息中携带有分配的IP。Preferably, after the target base station creates a data backtransmission channel according to the identifier and allocates an IP, the target base station needs to send a handover response message to the core network, wherein the handover response message carries the allocated IP.
在优选实施过程中，目标eNB根据Handover Request消息为即将切入的UE分配资源，准备无线资源信息，等待UE接入。目标eNB根据Handover Request消息中的是否是直接路径反传的标识和业务是否反传标识为上下行反传数据创建传输通道，分配IP，如果上述标识指示为直接路径反传，则为反传数据分配X2口VLAN的IP，否则为反传数据分配S1口VLAN的IP，然后组建切换请求确认(Handover RequestAcknowledge)消息发送给核心网，其中，该切换请求确认消息包含需要反传的业务的反传通道目的IP以及目标eNB通过核心网和源eNB转发给UE的包含移动性信息的重配消息(即切换命令)。In a preferred implementation process, the target eNB allocates resources for the UE that is about to switch in according to the Handover Request message, prepares radio resource information, and waits for the UE to access. The target eNB creates a transmission channel for the uplink and downlink reverse transmission data according to the identifier of whether the direct path reverse transmission and whether the service is reverse transmission in the Handover Request message, and allocates an IP. If the above identification indicates direct path reverse transmission, it is reverse transmission data Assign the IP of the VLAN of the X2 port, otherwise assign the IP of the VLAN of the S1 port for the reverse transmission data, and then form a Handover Request Acknowledge (Handover Request Acknowledge) message and send it to the core network, wherein the Handover Request Acknowledge message contains the reverse transmission of the service that needs to be reversed The destination IP of the channel and the reconfiguration message (that is, the handover command) including the mobility information forwarded by the target eNB to the UE through the core network and the source eNB.
之后，核心网根据Handover Request Acknowledge消息组建切换命令(HandoverCommand)消息，如果是直接路径反传，核心网将目标eNB发过来的业务反传目的IP填入Handover Command消息中，如果是非直接路径反传，核心网保存目标eNB传来的目的IP，并对需要反传的业务创建上下行数据反传通道，为反传通道分配目的IP，将分配的IP填入Handover Command消息，然后通过S1口发送给源eNB。After that, the core network constructs a handover command (HandoverCommand) message according to the Handover Request Acknowledge message. If it is a direct path backhaul, the core network will fill in the Handover Command message with the service backhaul destination IP sent by the target eNB. If it is an indirect path backhaul , the core network saves the destination IP sent by the target eNB, and creates an uplink and downlink data reverse transmission channel for the business that needs reverse transmission, allocates the destination IP for the reverse transmission channel, fills the allocated IP into the Handover Command message, and then sends it through the S1 port to the source eNB.
源eNB接收到Handover Command消息，解码得到其中的切换命令，发送给UE，并将各业务的上下行反传数据发送到Handover Command消息中携带的相应IP上，如果为直接路径反传，反传数据通过X2口直接发送到了目标eNB；如果为非直接路径反传，反传数据通过S1口发送到核心网，再由核心网通过S1口发送到目标eNB。The source eNB receives the Handover Command message, decodes it to obtain the handover command, sends it to the UE, and sends the uplink and downlink reverse transmission data of each service to the corresponding IP carried in the Handover Command message. If it is a direct path reverse transmission, the reverse transmission The data is directly sent to the target eNB through the X2 port; if it is a non-direct path backhaul, the backhaul data is sent to the core network through the S1 port, and then the core network sends it to the target eNB through the S1 port.
UE接入到目标eNB，给目标eNB发送重配完成消息，目标eNB给核心网发送HandoverNotify消息通知核心网切换完成，核心网给源eNB发送上下文释放命令，开始给目标eNB发送下行数据并开始接收上行数据，目标eNB将上行反传数据发给核心网，将下行反传数据发给UE，并开始正常处理上下行数据，切换完成。The UE accesses the target eNB, sends a reconfiguration completion message to the target eNB, the target eNB sends a HandoverNotify message to the core network to notify the core network that the handover is complete, the core network sends a context release command to the source eNB, and starts sending downlink data to the target eNB and starts receiving For the uplink data, the target eNB sends the uplink backtransmission data to the core network, sends the downlink backtransmission data to the UE, and starts to process the uplink and downlink data normally, and the handover is completed.
经过上述处理，经过S1接口的切换在目标eNB的S1口和X2口划分为不同VLAN的情况下目标eNB能够正确创建反传通道，分配反传IP，使反传数据能够正常接收。After the above processing, the target eNB can correctly create the backtransmission channel and assign the backtransmission IP when the S1 interface and X2 interface of the target eNB are divided into different VLANs after the switching of the S1 interface, so that the backtransmission data can be received normally.
以下结合图2和图3描述核心网中的MME不需要改变时S1切换流程图。The flow chart of the S1 handover when the MME in the core network does not need to be changed is described below with reference to FIG. 2 and FIG. 3 .
图2是根据本发明优选实施例一的IP分配方法的流程图。其中，同一个MME下进行S1切换的UE、eNB、MME、S-GW的连接关系图如图3所示，两个eNB均与同一个MME之间存在S1口偶联，两eNB之间无X2口，两eNB与同一S-GW相连，与切换前UE与eNB1存在UU口，即空口，切换后UE与eNB1的UU口断，与eNB2建立起UU口。需要注意的是，图2中将核心网的MME和S-GW画在同一框图内。如图2所示，该IP分配方法主要包括以下处理：Fig. 2 is a flow chart of the IP allocation method according to the
步骤S202：由于UE上发测量报告或者负荷均衡等原因，触发源eNB判决处于RRC连接态的UE需要进行站间切换，且由于没有可用的X2口，判决需要进行S1切换，数据反传类型为非直接路径反传，UE的所有业务均为AM模式，需要进行下行反传。Step S202: Due to reasons such as the UE sending a measurement report or load balancing, the trigger source eNB judges that the UE in the RRC connection state needs to perform an inter-site handover, and because there is no available X2 port, it decides that an S1 handover is required, and the data reverse transmission type is For non-direct path backtransmission, all services of the UE are in AM mode, and downlink backtransmission is required.
步骤S204：源eNB组建切换需求(Handover Required)消息通过S1口发送给MME，Handover Required消息中包括但不限于UE的RRC上下文、UE能力以及直接路径反传标志(是否直接路径反传的标识为FALSE)。Step S204: The source eNB sends a Handover Required message to the MME through the S1 port. The Handover Required message includes, but is not limited to, the UE's RRC context, UE capability, and direct path reverse flag (whether the direct path reverse flag is FALSE).
步骤S206：核心网的MME根据Handover Required消息中的信元填写切换请求(Handover Request)消息，该消息中包含但不限于UE的RRC上下文、UE能力、需要目标eNB建立的业务列表。Step S206: The MME of the core network fills in a handover request (Handover Request) message according to the information element in the Handover Required message, which includes but is not limited to the UE's RRC context, UE capabilities, and a list of services that need to be established by the target eNB.
步骤S208：MME根据Handover Required消息中的是否是直接路径反传的标识，将Handover Request消息中的是否是直接路径反传的标识信元或协议规定的作为直接路径反传标识的保留字段置为FALSE，Step S208: According to the identifier of whether the Handover Required message is a direct path reverse transmission, the MME sets the identification cell of whether it is a direct path reverse transmission in the Handover Request message or the reserved field specified by the protocol as the direct path reverse transmission identifier to FALSE,
步骤S210：将Handover Request消息通过S1口发送给目标eNB。Step S210: Send the Handover Request message to the target eNB through the S1 interface.
步骤S212：目标eNB根据Handover Request消息为即将切入的UE分配资源，准备无线资源信息，等待UE接入。Step S212: The target eNB allocates resources for the UE that is about to switch in according to the Handover Request message, prepares radio resource information, and waits for the UE to access.
步骤S214：目标eNB根据Handover Request消息中的是否是直接路径反传的标识为FALSE，判断反传路径为非直接路径反传，为反传数据分配S1口VLAN的IP；Step S214: The target eNB judges that the reverse transmission path is a non-direct path reverse transmission according to the flag of whether the direct path reverse transmission in the Handover Request message is FALSE, and allocates the IP of the S1 port VLAN for the reverse transmission data;
步骤S216：目标eNB组建切换请求确认(Handover Request Acknowledge)消息发送给MME，其中包含但不限于需要反传的业务的上下行反传数据通道目的IP以及目标eNB通过核心网和源eNB转发给UE的包含移动性信息的重配消息(即切换命令)。Step S216: The target eNB sends a handover request acknowledgment (Handover Request Acknowledge) message to the MME, including but not limited to the destination IP of the uplink and downlink reverse transmission data channels of the services that need to be reverse transmitted, and the target eNB forwards it to the UE through the core network and the source eNB A reconfiguration message (that is, a handover command) containing mobility information.
步骤S218：MME根据Handover Request Acknowledge消息组建Handover Command消息。由于是非直接路径反传，MME通知S-GW对切换UE的所有业务创建上下行反传通道，将目标eNB分配的目的IP带给S-GW。W-GS为反传通道分配目的IP并发给MME，MME将S-GW分配的目的IP填入Handover Command消息，然后通过S1口发送给源eNB。Step S218: The MME constructs a Handover Command message according to the Handover Request Acknowledge message. Since it is a non-direct path reverse transmission, the MME notifies the S-GW to create an uplink and downlink reverse transmission channel for all services of the handover UE, and brings the destination IP allocated by the target eNB to the S-GW. The W-GS allocates the destination IP for the backhaul channel and sends it to the MME. The MME fills the Handover Command message with the destination IP assigned by the S-GW, and then sends it to the source eNB through the S1 interface.
步骤S220：源eNB收到Handover Command消息，解码得到其中的切换命令，发送给UE；将各业务的上下行反传数据发送到Handover Command消息中携带的S-GW分配的目的IP上，反传数据通过S1口发送到核心网的S-GW，再由S-GW通过S1口发送到目标eNB分配的目的IP上，目标eNB接收到上下行反传数据。Step S220: The source eNB receives the Handover Command message, decodes it to obtain the handover command, and sends it to the UE; sends the uplink and downlink backtransmission data of each service to the destination IP assigned by the S-GW carried in the Handover Command message, and backtransmits The data is sent to the S-GW of the core network through the S1 port, and then sent by the S-GW to the destination IP allocated by the target eNB through the S1 port, and the target eNB receives the uplink and downlink reverse transmission data.
步骤S222：UE接入到目标eNB，给目标eNB发送重配完成消息；Step S222: The UE accesses the target eNB, and sends a reconfiguration complete message to the target eNB;
步骤S224：目标eNB给MME发送Handover Notify消息通知MME切换完成；Step S224: The target eNB sends a Handover Notify message to the MME to notify the MME that the handover is complete;
步骤S226：MME给源eNB发送上下文释放命令，并通知S-GW切换路径，S-GW停止给源eNB发送下行数据，开始给目标eNB发送下行数据和接收目标eNB的上行数据，目标eNB将上行反传数据按序投递给核心网，将下行反传数据发给UE，并开始正常处理上下行数据，切换完成。Step S226: MME sends a context release command to the source eNB and notifies the S-GW to switch paths, the S-GW stops sending downlink data to the source eNB, starts sending downlink data to the target eNB and receives uplink data from the target eNB, and the target eNB will go uplink The reverse transmission data is delivered to the core network in sequence, the downlink reverse transmission data is sent to the UE, and the uplink and downlink data are processed normally, and the handover is completed.
以下结合图4和图5描述核心网中的MME不需要改变时S1切换流程图。The flow chart of the S1 handover when the MME in the core network does not need to be changed is described below with reference to FIG. 4 and FIG. 5 .
图4是根据本发明优选实施例二的创建数据反传通道和分配IP的方法的流程图。其中，不同MME下进行S1切换的UE、eNB、MME、S-GW的连接关系图如图5所示，eNB1与MME1之间存在S1偶联，eNB2与MME2之间存在S1偶联，eNB1、eNB2、MME1、MME2均与同一个S-GW相连，两个eNB之间存在X2口偶联，切换前UE与eNB1存在UU口，即空口，切换后UE与eNB1的UU口断，与eNB2建立起UU口。如图5所示，该IP分配方法主要包括以下处理：Fig. 4 is a flowchart of a method for creating a data reverse transmission channel and assigning an IP according to the second preferred embodiment of the present invention. Among them, the connection relationship diagram of UE, eNB, MME, and S-GW performing S1 handover under different MMEs is shown in Figure 5. There is S1 coupling between eNB1 and MME1, there is S1 coupling between eNB2 and MME2, eNB1, eNB2, MME1, and MME2 are all connected to the same S-GW. There is an X2 interface coupling between the two eNBs. Before the handover, the UE and eNB1 have a UU interface, that is, an air interface. After the handover, the UU interface between the UE and eNB1 is disconnected, and it is established with eNB2. Open the UU port. As shown in Figure 5, the IP allocation method mainly includes the following processing:
步骤S402：由于UE上发测量报告或者负荷均衡等原因，触发源eNB判决处于RRC连接态的UE需要进行站间切换。由于源eNB与目标eNB与不同的MME相连，源eNB判决需要进行S1切换。由于源eNB与目标eNB之间有X2口，源eNB判决数据反传类型为直接路径反传。切换UE的所有业务均为AM模式，且需要进行下行反传；Step S402: The trigger source eNB determines that the UE in the RRC connected state needs to perform inter-site handover due to the UE sending a measurement report or load balancing. Since the source eNB and the target eNB are connected to different MMEs, the source eNB decides that an S1 handover is required. Since there is an X2 interface between the source eNB and the target eNB, the source eNB decides that the data backtransmission type is direct path backtransmission. All services of the handover UE are in AM mode, and downlink backtransmission is required;
步骤S404：源eNB组建Handover Required消息通过S1口发送给源MME，HandoverRequired消息中包括但不限于UE的RRC上下文、UE能力以及是否是直接路径反传的标识(例如，直接路径反传标志为TRUE)；Step S404: The source eNB sends a Handover Required message to the source MME through the S1 interface. The HandoverRequired message includes, but is not limited to, the UE's RRC context, UE capabilities, and the identifier of whether it is a direct path reverse transmission (for example, the direct path reverse transmission flag is TRUE );
步骤S406：源MME根据Handover Required消息中的信元填写Forward RelocationRequest；Step S406: The source MME fills in the Forward RelocationRequest according to the cell in the Handover Required message;
步骤S408：源MME根据Handover Required消息中的是否是直接路径反传的标识为TRUE，填写Forward Relocation Request消息中的是否是直接路径反传的标识为TRUE；Step S408: The source MME fills in the flag of whether the direct path inversion in the Forward Relocation Request message is TRUE according to whether the direct path inversion flag in the Handover Required message is TRUE;
步骤S410：源MME选择目标MME，并将填写了是否是直接路径反传的标识的ForwardRelocation Request消息发送给目标MME；Step S410: the source MME selects the target MME, and sends the ForwardRelocation Request message filled with the identifier of whether it is a direct path reverse transmission to the target MME;
步骤S412：目标MME收到Forward Relocation Request，根据该消息中的信元填写Handover Request消息，其中，该消息中包含但不限于UE的RRC上下文、UE能力、需要目标eNB建立的业务列表；Step S412: The target MME receives the Forward Relocation Request, and fills in the Handover Request message according to the information element in the message, wherein the message includes but not limited to the UE's RRC context, UE capabilities, and a list of services that need to be established by the target eNB;
步骤S414：目标MME根据Handover Required消息中的是否是直接路径反传的标识，填写Handover Request消息中的是否是直接路径反传的标识信元或协议规定的作为直接路径反传标识的保留字段为TRUE，将Handover Request消息通过S1口发送给目标eNB；Step S414: According to whether the Handover Required message indicates whether it is a direct path reverse transmission, the target MME fills in the Handover Request message whether it is a direct path reverse transmission identification cell or the reserved field specified by the protocol as the direct path reverse transmission identification. TRUE, send the Handover Request message to the target eNB through the S1 port;
步骤S416：目标eNB根据Handover Request消息为即将切入的UE分配资源，准备无线资源信息，等待UE接入。Step S416: The target eNB allocates resources for the UE that is about to switch in according to the Handover Request message, prepares radio resource information, and waits for the UE to access.
步骤S418：目标eNB根据Handover Request消息中的是否是直接路径反传的标识为TRUE，判断反传路径为直接路径反传，为反传数据分配X2口VLAN的IP；Step S418: The target eNB judges that the reverse transmission path is a direct path reverse transmission according to whether the flag of whether it is a direct path reverse transmission in the Handover Request message is TRUE, and allocates the IP of the X2 port VLAN for the reverse transmission data;
步骤S420：目标eNB组建Handover Request Acknowledge消息发送给MME，其中，Handover Request Acknowledge消息包含但不限于需要反传的业务的上下行反传数据通道目的IP以及目标eNB通过核心网和源eNB转发给UE的包含移动性信息的重配消息(即切换命令)。Step S420: The target eNB forms a Handover Request Acknowledge message and sends it to the MME, wherein the Handover Request Acknowledge message includes but is not limited to the destination IP of the uplink and downlink reverse transmission data channel of the service that needs reverse transmission and the target eNB forwards it to the UE through the core network and the source eNB A reconfiguration message (that is, a handover command) containing mobility information.
步骤S422：目标MME根据Handover Request Acknowledge消息组建ForwardRelocation Response消息，发送给源MME。Step S422: The target MME constructs a ForwardRelocation Response message according to the Handover Request Acknowledge message, and sends it to the source MME.
由于是直接路径反传，目标MME直接将目标eNB分配的反传路径IP填写到ForwardRelocation Response消息中。Since it is a direct path backhaul, the target MME directly fills in the ForwardRelocation Response message with the backhaul path IP assigned by the target eNB.
步骤S424：源MME根据Forward Relocation Response消息组建Handover Command消息，并将Forward Relocation Response消息中的反传目的IP填入Handover Command消息，然后通过S1口发送给源eNB。Step S424: The source MME constructs a Handover Command message according to the Forward Relocation Response message, fills the Handover Command message with the destination IP in the Forward Relocation Response message, and then sends it to the source eNB through the S1 interface.
步骤S426：源eNB收到Handover Command消息，解码得到其中的切换命令，发送给UE，并将各业务的上下行反传数据发送到Handover Command消息中携带的反传目的IP，即目标eNB分配的反传目的IP上，目标eNB接收到上下行反传数据。Step S426: The source eNB receives the Handover Command message, decodes it to obtain the handover command, sends it to the UE, and sends the uplink and downlink backtransmission data of each service to the backtransmission destination IP carried in the Handover Command message, that is, the one allocated by the target eNB On the reverse transmission destination IP, the target eNB receives the uplink and downlink reverse transmission data.
步骤S428：UE接入到目标eNB，给目标eNB发送重配完成消息；Step S428: The UE accesses the target eNB, and sends a reconfiguration complete message to the target eNB;
步骤S430：目标eNB给目标MME发送Handover Notify消息通知切换完成。Step S430: the target eNB sends a Handover Notify message to the target MME to notify the completion of the handover.
步骤S432：目标MME给S-GW发送业务修改请求(Modify Bearer Request)消息；Step S432: The target MME sends a service modification request (Modify Bearer Request) message to the S-GW;
步骤S434：目标MME给源MME发送Forward Relocation Complete Notification消息；Step S434: the target MME sends a Forward Relocation Complete Notification message to the source MME;
步骤S436：源MME给源eNB发送上下文释放命令，源eNB释放本地的UE资源。S-GW切换路径到目标eNB，在给源eNB发送End Marker包后停止给源eNB发送下行数据，开始处理目标eNB上的上下行数据。源eNB将End Marker包反传给目标eNB，目标eNB收到End Marker包后将上行反传数据按序投递给核心网，将下行反传数据发给UE，并开始正常处理上下行数据，切换完成。Step S436: the source MME sends a context release command to the source eNB, and the source eNB releases local UE resources. S-GW switches the path to the target eNB, stops sending downlink data to the source eNB after sending the End Marker packet to the source eNB, and starts processing uplink and downlink data on the target eNB. The source eNB transmits the End Marker packet back to the target eNB. After receiving the End Marker packet, the target eNB delivers the uplink reverse data to the core network in sequence, sends the downlink reverse data to the UE, and starts to process the uplink and downlink data normally. Finish.
图6是根据本发明实施例的创建数据反传通道和分配IP的系统的结构框图。如图6所示，该IP分配系统主要包括：核心网10和目标基站20；所述核心网10包括：扩展模块100，用于将是否是直接路径反传的第一标识携带在所述切换请求消息中；目标基站20可以进一步包括：第一接收模块200，用于在执行S1切换过程中，接收来自于核心网的切换请求消息，其中，切换请求消息中携带有是否是直接路径反传的第一标识；处理模块202，用于按照第一标识创建数据反传通道并分配IP。Fig. 6 is a structural block diagram of a system for creating a data reverse transmission channel and allocating IP according to an embodiment of the present invention. As shown in Figure 6, the IP allocation system mainly includes: a
优选地，如图7所示，上述系统还可以包括；还包括：源基站30；其中，源基站30包括：判决模块300，用于判决是否需要执行S1切换；第一发送模块302，用于发送切换需求消息，其中，切换需求消息携带有是否是直接路径反传的第二标识；核心网10还包括：第二接收模块102，用于在源基站确定执行S1切换后，接收来自于源基站的切换需求消息；第二发送模块104，用于根据第二标识将第一标识携带在切换请求消息中发送。Preferably, as shown in FIG. 7, the above-mentioned system may further include: a source base station 30; wherein, the source base station 30 includes: a judging module 300 for judging whether an S1 handover needs to be performed; a first sending module 302 for Sending a handover request message, where the handover request message carries a second identifier indicating whether it is direct path inverse transmission; the
优选地，如图7所示，处理模块202可以进一步包括：判断单元(图7未示出)，用于判断第一标识是否指示直接路径反传；处理单元(图7未示出)，用于在判断单元输出为是时，通过X2口建立数据反传通道，并为反传数据分配X2口VLAN的IP；在判断单元输出为否时，通过S1口建立数据反传通道，并为反传数据分配S1口VLAN的IP。Preferably, as shown in FIG. 7 , the processing module 202 may further include: a judging unit (not shown in FIG. 7 ), configured to judge whether the first identifier indicates direct path backpropagation; a processing unit (not shown in FIG. 7 ), using When the output of the judging unit is yes, establish a data reverse transmission channel through the X2 port, and assign the IP of the X2 port VLAN for the reverse data; when the judgment unit output is no, establish a data reverse transmission channel through the S1 port, and assign Data transmission assigns the IP of S1 port VLAN.
优选地，如图7所示，目标基站20还包括；第三发送模块204，用于向核心网发送切换请求确认消息，其中，切换请求确认消息中携带有分配的IP。Preferably, as shown in FIG. 7, the target base station 20 further includes; a third sending module 204, configured to send a handover request confirmation message to the core network, wherein the handover request confirmation message carries the allocated IP.
需要注意的是，上述目标基站、源基站和核心网中的各模块、各单元相互结合的优选实施方式具体可以参见图1至图5的描述，此处不再赘述。It should be noted that, the preferred implementation manners of combining modules and units in the above-mentioned target base station, source base station, and core network can refer to the descriptions in FIG. 1 to FIG. 5 , and will not be repeated here.
从以上的描述中，可以看出，本发明实现了如下技术效果：在现有LTE技术的基础上，有效地解决了S1切换时划分VLAN的目标eNB由于无法知道切换的反传路径而导致无法正确建立反传通道来接收反传数据，以及无法正确按照VALN的划分来分配反传通道IP的问题，保证了S1切换的数据反传成功，减小了切换过程的数据丢失和业务中断，极大地提高了LTE系统性能和用户感受。From the above description, it can be seen that the present invention achieves the following technical effects: on the basis of the existing LTE technology, it effectively solves the problem that the target eNB that divides the VLAN during the S1 handover cannot know the reverse transmission path of the handover. The correct establishment of the reverse transmission channel to receive the reverse transmission data, and the problem that the IP of the reverse transmission channel cannot be correctly allocated according to the division of the VLAN, ensure the success of the data reverse transmission of the S1 handover, reduce the data loss and service interruption during the handover process, and extremely Greatly improved LTE system performance and user experience.
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or their Multiple modules or steps are implemented as a single integrated circuit module. As such, the present invention is not limited to any specific combination of hardware and software.
以上仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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| WO2012174798A1 (en) | 2012-12-27 |
| CN102223669B (en) | 2018-06-12 |
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