Handover Drop Recovery via Code Ranging Signal
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Solution Overview
Problem
In wireless communication systems, handover drops can lead to inconsistencies in communication states between Mobile Stations (MS) and Base Stations (BS), causing communication interruptions and potential allocation issues with Connection IDs (CIDs), as the BS may mistakenly allocate a CID to another MS, resulting in service disruptions.
Innovation Solution
The method involves selecting a BS for handover, identifying stored communication information, performing code ranging with the serving BS, transmitting a message ranging request signal, and resuming service when the BS confirms service provision, ensuring consistent communication states by using specific signal types and timers to manage resource maintenance and re-initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MS returns to the serving BS after HO drop using conventional procedures, then the MS can resume communication with the serving BS, but the BS may have already allocated the CID to another MS causing communication state inconsistency and service disruption
Solution Approach 1:
The MS performs code ranging with the serving BS before attempting to resume service, thereby proactively verifying whether the serving BS still retains communication information. This preliminary action prevents the subsequent problem of CID allocation inconsistency by detecting the BS's current state in advance.
Solution Approach 2:
The MS uses the response from code ranging as feedback to determine the next action: if the serving BS responds positively, the MS resumes service; if not, the MS selects a new target BS. This feedback mechanism ensures the MS adapts to the actual state of the serving BS and avoids communication state inconsistency.
2Productivity
If the BS releases communication information after HO initiation to free resources, then resource allocation efficiency improves, but the BS loses ability to serve the MS if HO fails causing communication interruption
Solution Approach 1:
The MS performs code ranging before service resumption to preliminarily verify the serving BS's retention of communication information. This allows the BS to confidently release resources after confirmation that the MS will not return, improving resource allocation efficiency without compromising service continuity.
Solution Approach 2:
The MS autonomously determines whether to resume service with the serving BS or select a new target BS based on the code ranging response. This self-service approach enables the MS to handle HO failure independently, allowing the BS to release resources promptly while ensuring service continuity through MS's autonomous decision-making.
Data Source
AI summary
An apparatus and method for processing handover in a wireless communication system are provided. The method includes selecting a cell for handover when a HandOver (HO) drop occurs, identifying if information for communicating with a serving BS is stored, transmitting a message ranging request signal to the serving BS, identifying provision or non-provision of a service from the serving BS comprised in a response signal to the message ranging request signal, and transmitting/receiving a signal with the serving BS.