Dual SIM RRC Connection Sharing for Power Optimization
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Solution Overview
Problem
Dual SIM mobile phones face challenges in power consumption optimization when both SIMs are camped and registered on the same cell of a Public Land Mobile Network (PLMN), leading to increased power usage and duplication of Radio Resource Control (RRC) procedures, especially in dual SIM dual active (DSDA) mode where both transceivers are always on.
Innovation Solution
A method and system that utilize a single RRC connection for both SIMs, allowing the idle SIM to receive paging messages through the available RRC connection of the active SIM, and enabling the idle SIM to trigger signaling connections using the existing RRC connection, thereby reducing power consumption and eliminating duplicated RRC procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both transceivers are switched on for complete duration in DSDA mode, then both SIMs can remain in connected mode, but power consumption increases
Solution Approach 1:
The patent merges the RRC connections of both SIMs into a single shared RRC connection. This allows both SIMs to maintain connected mode functionality while using a single transceiver, thereby reducing power consumption compared to having both transceivers running simultaneously.
Solution Approach 2:
The single RRC connection serves multiple functions by handling signaling for both SIMs. The connection acts as a universal interface that enables both SIMs to access network services without requiring separate dedicated connections, thus optimizing resource utilization.
2Adaptability or versatility
If two transceivers are present in DSDA mode, then both SIMs can be actively connected, but device complexity increases
Solution Approach 1:
The patent combines the RRC connection resources for both SIMs into a single shared connection. This merging approach maintains the ability to support both SIMs in connected mode while reducing the complexity of managing multiple separate transceiver connections and their associated configuration.
3Productivity
If both SIMs are camped on the same cell, then network resources are shared, but RRC procedures are duplicated
Solution Approach 1:
The patent merges the RRC procedure execution into a single connection context. By establishing one RRC connection that serves both SIMs, the system eliminates the duplication of RRC procedures that would otherwise occur when each SIM has its own separate connection, thereby reducing time loss.
Data Source
AI summary
A method of optimizing connection mode procedures for a dual subscriber identity module (SIM) mobile communication device is provided. The method includes receiving, by a base station, a paging message for a first SIM in an idle mode from a core network; determining, by the base station, if a radio resource control (RRC) connection linked with the first SIM is available or not; triggering, by the base station, a second paging type message for the first SIM with a normal cause through the RRC connection linked with the first SIM if the RRC connection of the first SIM is available; determining, by the base station, if a RRC connection linked with a second SIM is available or not if the RRC connection of the first SIM is not available; triggering, by the base station, a second paging type message for the first SIM with a mapped new cause through the RRC connection linked with the second SIM if the second SIM is available; and triggering, by the base station, a first paging type message with a temporary identity and a cause received in the paging message from the core network through a paging channel if the RRC connection linked with the second SIM is not available.