CID Allocation for Fast Handover in Mobile Networks
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Solution Overview
Problem
Current handover methods in mobile communication systems face delays due to the inefficiency in allocating and updating connection identifiers (CIDs) during the handover process, which hinders fast handover and ranging procedures.
Innovation Solution
A method is introduced to efficiently allocate and update CIDs by transmitting handover request and response messages between serving and target base stations, including CID update information such as transport CID allocation start position and allocable values, represented as a bitmap string, to minimize service delays during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover methods are used where the target base station generates CID after receiving ranging request from MS, then the ranging procedure can be completed, but service delay increases due to the sequential nature of the process
Solution Approach 1:
The target base station performs CID allocation in advance during the handover request phase, before the MS performs ranging. The allocated CID information is included in the handover response message, so when the MS completes ranging, the CID is already ready and can be immediately activated, eliminating the sequential delay of generating CID after ranging.
Solution Approach 2:
The serving base station acts as an intermediary to transmit the CID allocation information from the target base station to the MS through the handover response message. This mediator enables the MS to obtain pre-allocated CID information without waiting for the post-ranging CID generation process.
2Reliability
If the target base station allocates CID after ranging procedure, then the ranging can be completed with proper synchronization, but the handover process becomes slower
Solution Approach 1:
The target base station performs CID allocation before the ranging procedure completes. The CID is prepared in advance and transmitted to the MS through the serving base station in the handover response message, allowing the MS to have CID ready before actual handover execution, thus reducing handover time while maintaining synchronization quality.
3Device complexity
If CID allocation is performed sequentially after ranging request, then the system maintains simplicity, but communication efficiency decreases during handover
Solution Approach 1:
The system maintains relative simplicity by having the target base station allocate CID in advance during the handover request phase and include it in the handover response message. This preliminary action allows the MS to obtain CID information before handover, improving communication efficiency without requiring complex post-ranging CID generation and transmission mechanisms.
Data Source
AI summary
A handover performing method and a method of allocating a connection identifier (CID) at the time of handover are disclosed. The method includes transmitting a handover request message to a serving base station, and receiving a handover response message including CID update information used in a target base station from the serving base station. At this time, the CID update information may include a transport CID (TCID) allocation start position and a TCID allocable value used in the target base station. Accordingly, it is possible to minimize service delay of a mobile station by providing a method of updating the CID of the mobile station for performing fast handover.