Dual SIM Paging Collision Mitigation via DRX Offset Adjustment
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Solution Overview
Problem
Dual SIM devices experience inefficiencies due to page collisions, where paging messages from different subscriptions overlap, leading to missed notifications and decreased system performance, especially when using a single transceiver.
Innovation Solution
The implementation of modified radio access technology (RAT) priority settings to avoid overlap between discontinuous reception (DRX) cycles of different subscriptions, allowing the device to prioritize RATs with different time intervals, such as GSM over LTE, and reducing DRX durations to increase paging opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transceiver is used in Dual SIM devices, then device complexity is reduced, but paging message reception reliability deteriorates due to page collisions between subscriptions
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment where the system adaptively modifies the discontinuous reception cycle parameters based on detected page collision patterns. The network side can dynamically change drx-OffsetIndicator and drx-HARQ-Offset values to resynchronize paging occasions, allowing the single transceiver to reliably receive paging messages from both subscriptions without requiring multiple receivers.
Solution Approach 2:
The patent changes temporal parameters of the paging mechanism by adjusting DRX cycle lengths, offsets, and timing configurations. By modifying these parameters, the system shifts paging occasions to non-overlapping time slots, enabling a single transceiver to successfully receive paging messages from both SIM subscriptions without collision.
2Reliability
If DRX cycles are shortened to increase paging opportunities, then paging reliability improves, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts DRX cycle parameters based on actual paging collision detection rather than using fixed short cycles. When collisions are detected, the network modifies drx-OffsetIndicator and drx-HARQ-Offset to resynchronize paging occasions, allowing the device to maintain longer DRX cycles without missing pages, thus preserving energy while ensuring reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the device monitors for page collisions and reports them to the network. The network then adjusts DRX parameters based on this feedback, creating a closed-loop system that optimizes the balance between paging reliability and energy consumption rather than using static aggressive DRX configurations.
3Reliability
If paging messages are monitored simultaneously for both subscriptions, then paging completeness improves, but page collisions increase due to overlapping time slots
Solution Approach 1:
The system dynamically adjusts the timing of paging occasions by modifying DRX cycle parameters when collisions are detected. The network changes drx-OffsetIndicator and drx-HARQ-Offset values to shift paging time slots, allowing both subscriptions to be monitored simultaneously without overlapping paging messages, thus eliminating collisions while maintaining completeness.
Solution Approach 2:
The patent changes the temporal parameters of paging monitoring by adjusting DRX cycle lengths and offsets for different subscriptions. This parameter modification shifts the time slots where paging messages are expected, separating overlapping paging occasions and allowing simultaneous monitoring of both subscriptions without collision interference.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Some wireless devices (e.g., dual subscriber identity modules (SIM) devices) may support two subscriptions such that while one subscription is actively transmitting or receiving, the other subscription is put on standby. The wireless device may identify collisions in time between monitored paging messages associated with the first and second subscriptions. Accordingly, the wireless device may modify a radio access technology (RAT) priority setting for one of the subscriptions, such that paging messages may be received via a RAT different that the RAT used for the other subscription (e.g., following a cell reselection procedure performed according to the modified RAT priority). Operation using a modified RAT priority setting may be referred to as a fallback mode, which may be exited upon expiration of a timer. Additionally, discontinuous reception (DRX) durations associated with the RATs used for subscription paging may be reduced.