Adaptive Multi-Rate Codec Half-Rate Mode for Emergency Handover Capacity
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Solution Overview
Problem
In cellular telecommunication networks, emergency handovers often result in dropped calls when the candidate handover cell lacks available capacity, as existing methods fail to efficiently manage call capacity during such situations.
Innovation Solution
The system adjusts call capacity by dividing Full-Rate timeslots into Half-Rate sub-slots using Adaptive Multi-Rate codecs, allowing for increased call handling during emergency handovers by instructing codecs to switch to Half-Rate mode when the candidate cell is fully loaded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the candidate handover cell is fully loaded with calls, then the network maintains call capacity stability, but emergency handovers result in dropped calls
Solution Approach 1:
The patent applies dynamics by making the timeslot rate adaptive - switching between Full-Rate and Half-Rate modes based on network conditions and handover requirements. The system dynamically adjusts the call capacity of the candidate cell by instructing codecs to switch to Half-Rate mode when the cell is fully loaded, allowing emergency handovers to succeed while maintaining overall network stability.
Solution Approach 2:
The patent changes the rate parameter of timeslots from Fixed Full-Rate to variable Half-Rate/Full-Rate. By modifying the timeslot rate parameter, the system increases call capacity in the candidate cell during emergency handovers. The Base Station Controller monitors cell load and signal quality, then adjusts the timeslot rate parameter to enable or disable Half-Rate mode, resolving the contradiction between maintaining capacity stability and enabling emergency handovers.
2Reliability
If the system uses Fixed Full-Rate timeslots, then the call quality is maintained, but the call capacity is insufficient during emergency handovers
Solution Approach 1:
The system transitions from static Full-Rate timeslots to dynamic Half-Rate/Full-Rate timeslots. The rate parameter becomes adaptive, switching between Full-Rate (higher quality) and Half-Rate (higher capacity) modes based on whether normal operation or emergency handover is required. This dynamic adjustment allows the system to maintain call quality under normal conditions while increasing capacity during emergencies.
Solution Approach 2:
The patent modifies the timeslot rate parameter from a fixed Full-Rate setting to a variable parameter that can switch between Full-Rate and Half-Rate modes. The Base Station Controller monitors cell load and signal quality parameters, then adjusts the timeslot rate parameter accordingly - maintaining Full-Rate for quality when capacity is sufficient, and switching to Half-Rate for increased capacity during emergency handovers when the cell is fully loaded.
Data Source
AI summary
Call handover in a cellular telecommunication system is improved by adjusting a rate-based parameter, such as that controlled by an adaptive multi-rate (AMR) codec in a time-division multiple access (TDMA) network, to increase call handling capacity when handover is indicated but the candidate handover cell does not have sufficient capacity to handle another call.