Method and system for implementing X2 proxy

#The present disclosure relates to a wireless cellular communication technology, and in particular to a method and system for implementing X2 proxy.

#In order to meet growing requirements on broadband high-speed mobile access, the Third Generation Partnership Project (3GPP) puts forward a Long-Term Evolution Advance (LTE-Advanced) standard. LTE-Advanced is an evolution of Long-Term Evolution (LTE), keeps a core of LTE, and expands the frequency domain and the time domain on such a basis to fulfil the aims of increasing a spectrum utilization rate, improving system capacity and the like by adopting a series of technologies.

#A wireless relay technology is one of technologies for LTE-Advanced, and aims to widen coverage of a cell, reduce dead areas in communication, balance a load, transfer a service of a hotspot and reduce transmitted power of User Equipment (UE). In the wireless relay technology, a Relay Node (RN) provides a function and service similar to those of an ordinary evolved Node B (eNB) for UE accessing the cell of the RN, and further accesses an eNB which serving the RN through a wireless interface like ordinary UE; and here, the eNB serving the RN may be called a Donor eNB (DeNB), and the DeNB is connected with a Mobility Management Entity (MME). As shown in FIG. 1, a DeNB has provided with Serving GateWay (S-GW) and Packet Data Network GateWay (P-GW) functions, and also has a relay GateWay (GW) function. When an RN accesses a DeNB, an MME may select a local S-GW and P-GW located in the DeNB for the RN, wherein the S-GW is responsible for data information transmission, forwarding, routing and the like between the DeNB and the P-GW as well as caching of a downlink data packet; and the P-GW is an anchor point of data bearer, and is responsible for data packet forwarding, analysis, legal monitoring and service-based charging and Quality of Service (QoS) control. A relay GW has an S1/X2 proxy function, and is responsible for processing related S1/X2 signalling of UE, distinguishing signalling of different UE and performing correct message processing. For example, there are multiple RN like RN1 in a fixed relay scenario, and the X2 proxy function is defined as follows: there is an X2 interface between a DeNB and RN1, there are also X2 interfaces between the DeNB and adjacent eNBs around or other RNs, and when the DeNB with a relay GW function receives an X2 message from RN1, the DeNB may determine the adjacent eNBs or RNs to which related X2 information is to be transmitted according to cell information in the X2 message; here, if the received X2 message contains a UE application layer protocol identifier, the DeNB allocates a new UE application layer protocol identifier to UE or replaces the UE application layer protocol identifier in the message with a UE application layer protocol identifier which has been allocated to the UE, and contains the new UE application layer protocol identifier in the X2 message sent to the other adjacent eNBs as the UE application layer protocol identifier allocated by the DeNB; correspondingly, when the DeNB with the relay GW function receives an X2 message from another eNB or another RN except RN1, the DeNB may determine whether to send the related X2 message to RN1 or not according to the cell information in the X2 message; and here, if the received X2 message contains the UE application layer protocol identifier, the DeNB allocates the new UE application layer protocol identifier to the UE or replaces the UE application layer protocol identifier contained in the message, and includes the new UE application layer protocol identifier into the X2 message sent to RN1 as the UE application layer protocol identifier allocated by the DeNB. For example, if the received X2 message indicates that RN1 is a target cell, the corresponding X2 message is sent to RN1. For example, if the received X2 message is an eNB configuration updating message, the eNB configuration updating message may further be sent to RN1. In such an X2 proxy manner, information transmission between an RN and another adjacent eNB or RN is implemented; wherein, S1/X2 signalling between the RN and the DeNB with the relay GW function is wirelessly born by the RN, and is routed and forwarded for transmission through an RN SGW/PGW.

#In the drawings (which may not be proportionally drawn), similar reference signs may describe similar parts in different figures. Similar reference signs with different letter suffixes may represent different examples of similar parts. The figures substantially show each embodiment discussed in the present disclosure as, not limited to, examples.

#FIG. 1 is an architecture diagram of an RN;

#FIG. 2 is a diagram of a deployment scenario of an MR;

#The present disclosure is further described below with reference to the drawings and specific embodiments in detail.

#In each embodiment of the present disclosure: a function of a next-hop node serving as an X2 proxy of a previous-hop node is activated; and X2 message interaction between an initial node and a target node is implemented through more than one X2 proxy including the previous-hop node and the next-hop node.

#An embodiment of the present disclosure provides a method for implementing an X2 proxy, and as shown in FIG. 3, the method includes the following steps: