Mobile Subscriber Station Handover Optimization via Preliminary Action
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Solution Overview
Problem
The existing handover methods in mobile communication systems, particularly in 4G wireless networks, result in significant delays and service interruptions due to frequent network reentries and poor connection conditions during handovers, especially when signal quality is low, leading to increased random access delays and potential connection interruptions.
Innovation Solution
A system and method that utilize a stepped backbone communication mechanism and polling mechanism to optimize handover processes by omitting specific steps in the network reentry process, such as basic capability re-negotiation, security key reuse, and pre-authentication schemes, to reduce handover time delays and improve handover efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete network reentry process is performed during handover, then connection reliability is ensured, but handover time delay increases significantly
Solution Approach 1:
The patent applies preliminary action by performing capability negotiation and security key exchange between the serving base station and target base station before the actual handover occurs. The serving base station transmits capability information to the target base station in advance, and security keys are exchanged beforehand, so that when handover is needed, these preparations are already in place and the MSS can proceed directly to connection establishment without repeating these time-consuming steps.
Solution Approach 2:
The patent extracts and separates the essential handover components into two distinct phases: a preparation phase where the serving base station and target base station complete capability negotiation and security key exchange, and an execution phase where only the essential connection establishment occurs. This extraction allows the time-consuming preparation work to be done in advance, leaving only the critical connection establishment for the actual handover moment.
2Stability of the object's composition
If frequent handovers are performed to track mobile user, then service continuity is improved, but random access delays increase and connection interruptions occur
Solution Approach 1:
The patent applies preliminary action by having the serving base station transmit capability information and perform security key exchange with the target base station before handover is needed. This preparation eliminates the need for random access procedures during handover, as the connection parameters are already negotiated and security is already established, thereby eliminating random access delays even when frequent handovers are required to track mobile users.
3Reliability
If handover is initiated when signal quality degrades below threshold, then connection reliability is maintained, but service quality deteriorates due to frequent reentries
Solution Approach 1:
The patent applies preliminary action by preparing the target base station in advance with capability information and security keys before the actual handover is needed. This allows the system to maintain connection reliability by having pre-prepared handover targets while minimizing service quality impact, as the pre-prepared handover process eliminates repeated capability negotiation and security re-establishment that would otherwise occur with frequent signal-quality-triggered handovers.
Data Source
AI summary
Disclosed are a system and a method for optimizing a handover process in a mobile broadband wireless access system. The method performs handover in a mobile communication system including a mobile subscriber station, a serving base station currently providing service to the mobile subscriber station, and at least one neighbor base stations adjacent to the serving base station. The method includes the steps of receiving a handover request from the mobile subscriber station by the serving base station; instructing the mobile subscriber station to perform handover by the serving base station in response to the handover request from the mobile subscriber station and performing by the mobile subscriber station a network reentry process for fast handover in accordance with information included in a handover instruction from the serving base station.