DRC Ramp Down Duration Optimization for DSDS Tune-Away Throughput
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Solution Overview
Problem
Dual-SIM dual-standby (DSDS) devices engaged in EVDO traffic experience throughput degradation due to the conventional DRC ramp down procedure, which transmits a null cover for an extended duration, causing unnecessary inhibition of EVDO traffic during tune-away operations to other protocols like GSM or 1X.
Innovation Solution
The DRC ramp down procedure is shortened to a duration corresponding to the reception of a single packet, dynamically determined based on the current DRC selected for the EVDO traffic call, allowing for increased EVDO traffic duration before tune-away operations, thereby enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DRC ramp down procedure transmits a null cover for an extended duration, then the device can reliably switch to another protocol during tune-away operations, but the EVDO traffic duration is reduced and throughput is degraded
Solution Approach 1:
The patent changes the duration parameter of the DRC ramp down procedure from an extended fixed duration to a shortened dynamic duration. Specifically, the null cover transmission is limited to a maximum of 16 packet slots instead of extending indefinitely, and the actual duration is dynamically adjusted based on the current DRC value and packet reception timing. This parameter change resolves the contradiction by reducing the unnecessary inhibition period while maintaining sufficient time for reliable protocol switching.
Solution Approach 2:
The patent introduces dynamic adjustment to the DRC ramp down duration based on real-time conditions. The procedure adapts its duration according to the current DRC value selected for the EVDO traffic call and the timing of packet reception. This dynamic approach allows the system to optimize the balance between reliable switching and throughput maintenance, resolving the contradiction by making the null cover transmission duration flexible rather than fixed and extended.
2Reliability
If the DRC ramp down procedure transmits a null cover for an extended duration, then the device ensures sufficient time to resume EVDO traffic calls, but the time available for EVDO traffic before tune-away is reduced
Solution Approach 1:
The patent changes the parameter of null cover transmission duration from extended to shortened (maximum 16 packet slots). This reduction ensures that the EVDO traffic can continue for a longer duration before the tune-away operation begins, while still providing sufficient time for the device to resume the EVDO traffic call after completing the tune-away to another protocol.
Solution Approach 2:
The patent performs the necessary DRC ramp down procedure in advance of the tune-away operation, but limits it to a reasonable duration (maximum 16 packet slots). By completing this preliminary action quickly and efficiently, the system preserves more EVDO traffic duration while ensuring that the device is properly prepared to resume the call after tune-away, thus resolving the contradiction between reliability and duration.
3Adaptability or versatility
If the DRC ramp down procedure uses a fixed extended duration, then the device can handle protocol switching, but the system cannot adapt to different DRC values and packet reception timings
Solution Approach 1:
The patent makes the DRC ramp down procedure dynamic by adjusting its duration based on the current DRC value and packet reception timing. Instead of using a fixed extended duration, the system adapts the null cover transmission length to match the actual needs of each specific situation. This dynamic adaptation increases versatility while maintaining manageable complexity through clear conditional logic.
Solution Approach 2:
The patent changes the DRC ramp down procedure from a fixed-parameter approach to a variable-parameter approach. The duration parameter is dynamically determined based on the current DRC value selected for the EVDO traffic call and the timing of packet reception. This parameter change enables the system to adapt to different communication conditions without significantly increasing overall device complexity.
Data Source
AI summary
Apparatus and methods are disclosed for establishing a call utilizing a traffic channel corresponding to a first communication protocol; transmitting a data rate control (DRC) channel comprising a null cover for no greater than 16 time slots; tuning away from the call to receive signaling corresponding to a second communication protocol; and following the receiving of the signaling corresponding to the second communication protocol, tuning back to the traffic channel to resume the call.