LHN ID Exchange in X2 Setup for SIPTO Local Gateway
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Solution Overview
Problem
In wireless communication systems, particularly in LTE networks, dual connectivity for SIPTO@LN (Selected IP Traffic Offload at the Local Network) faces challenges in SeNB mobility support and MME triggered S-GW relocation due to lack of information about the Local Home Network Identity (LHN ID) and L-GW support during the X2 setup procedure.
Innovation Solution
The method involves transmitting and receiving LHN ID information through X2 Setup Request and X2 Setup Response messages between eNBs to determine LHN ID matching and trigger SeNB addition procedures, and using modified messages like SeNB Modification Request to facilitate S-GW relocation with updated transport information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual connectivity is supported for SIPTO@LN, then network flexibility and local access capability are improved, but information about LHN ID and L-GW support is lost during X2 setup procedure
Solution Approach 1:
The patent applies preliminary action by including LHN ID and L-GW support indication information in the X2 Setup Request message during the initial X2 interface establishment between eNBs. This ensures that the Master eNB obtains the Secondary eNB's LHN ID and L-GW support capability before dual connectivity is activated, preventing information loss and enabling proper SIPTO@LN operation.
2Device complexity
If centralized gateway architecture is used, then network management is simplified, but local network access capability is reduced
Solution Approach 1:
The patent applies segmentation by introducing standalone Local Gateways (L-GWs) that are collocated with S-GWs, creating a segmented architecture where local network traffic can be offloaded independently from the centralized gateway. This allows the network to maintain simplified centralized management while simultaneously providing enhanced local network access capability through distributed L-GW nodes.
Solution Approach 2:
The patent applies local quality by enabling eNBs to identify and connect to local L-GWs using LHN ID matching, allowing traffic to be routed locally when possible while maintaining centralized gateway connectivity. This creates different quality levels for different traffic flows - local traffic gets low-latency direct access while other traffic uses the centralized path.
3Reliability
If LHN ID matching is performed during SeNB addition, then network stability is improved, but signaling overhead increases
Solution Approach 1:
The patent performs LHN ID matching during the X2 Setup procedure, which occurs before SeNB addition and dual connectivity activation. By completing the LHN ID exchange and matching determination in advance, the patent avoids the need for additional signaling messages during the actual SeNB addition process, thus maintaining network stability while minimizing signaling overhead.
Data Source
AI summary
A method and apparatus for transmitting a local home network identity (LHN ID) in a wireless communication system is provided. A first evolved NodeB (eNB) transmits an X2 Setup Request message including a LHN ID of the first eNB to a second eNB, and receives an X2 Setup Response message including a LHN ID of the second eNB from the second eNB. The first eNB may determine whether or not to trigger a secondary eNB (SeNB) addition procedure according to the LHN ID of the second eNB. When it is determined that the LHN ID of the second eNB is the same as the LHN ID of the first eNB, the first eNB may trigger the SeNB addition procedure.