Dual-USIM LTE Paging Offset Control for Collision Avoidance
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Solution Overview
Problem
In wireless communication devices with multiple USIMs, overlapping paging occasions lead to collisions and increased power consumption due to frequent wake-ups, especially when USIMs are camped on different or same cells.
Innovation Solution
The method controls paging occasions to avoid collisions by separating them for USIMs on different cells and minimizing gaps, or maximizes overlapping ratios for USIMs on the same cell to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paging occasions for multiple USIMs are configured independently, then each USIM can be monitored separately, but paging collisions occur when USIMs are camped on different cells
Solution Approach 1:
The patent changes the timing parameter of paging occasions by introducing an IMSI offset that shifts the paging occasion timing for different USIMs. This parameter adjustment separates the paging occasions in time domain, preventing collisions while maintaining reliable monitoring for each USIM.
Solution Approach 2:
The patent introduces a new dimension for paging occasion differentiation by using IMSI-based offset calculation. Instead of only relying on cell-based configuration, the solution adds an identity-based timing offset dimension that uniquely identifies each USIM's paging timing, thereby avoiding collisions.
2Object-generated harmful factors
If paging occasions for multiple USIMs are separated to avoid collisions, then paging collision is avoided, but the gap between paging occasions increases leading to frequent wake-ups
Solution Approach 1:
The patent optimizes the timing parameters by calculating the IMSI offset to achieve the minimum necessary separation between paging occasions. This parameter optimization ensures collision avoidance while minimizing the time gap, thereby reducing the frequency of wake-ups and lowering power consumption.
Solution Approach 2:
The patent implements dynamic paging occasion adjustment where the offset is calculated based on individual USIM characteristics and network conditions. This dynamic approach allows the system to adaptively minimize gaps between paging occasions while maintaining collision-free operation, optimizing power consumption in real-time.
3Reliability
If paging occasions for multiple USIMs are configured far apart, then paging collision is avoided, but the device must frequently wake up increasing power consumption
Solution Approach 1:
The patent modifies the paging timing parameters by introducing an optimized IMSI offset calculation that minimizes the time gap between paging occasions. This parameter change ensures that USIMs wake up as infrequently as possible while maintaining collision-free operation, thereby maximizing sleep time and reducing time loss.
4Reliability
If the device monitors paging occasions for multiple USIMs frequently, then paging reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic paging monitoring with optimized intervals by calculating appropriate IMSI offsets for different USIMs. This periodic action with optimized timing ensures that each USIM is monitored reliably at its designated paging occasion while minimizing the overall number of wake-ups, thereby reducing power consumption.
Solution Approach 2:
The patent changes the monitoring frequency parameters by introducing identity-based timing offsets. This parameter change allows the device to maintain reliable paging monitoring for multiple USIMs while reducing the overall monitoring frequency compared to uniform frequent monitoring, thus lowering power consumption.
Data Source
AI summary
A controlling method for a wireless communication device is provided. The controlling method for the wireless communication device includes: attaching a first Universal Subscriber Identity Module (USIM) to a Long-Term Evolution (LTE) network; determining whether a second USIM is camped on the LTE network; detecting whether a paging collision is happened, if the second USIM is camped on the LTE network; generating a requested International Mobile Subscriber Identity (IMSI) offset for the second USIM, if the paging collision is happened, wherein the requested IMSI offset is 1 or min(T, nB)−1, T is a default paging period and nB is a number of paging occurrences within the default paging period; transmitting an attach request with the requested IMSI offset to the LTE network for the second USIM; receiving a negotiated IMSI offset from the LTE network; and attaching the second USIM to the LTE network with the negotiated IMSI offset.