Multi-SIM Paging Assistance for Limited RX/TX Chains
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Solution Overview
Problem
Wireless terminals with multiple SIMs face inefficiencies in resource utilization due to the inability to independently monitor paging for all SIMs when the number of RX/TX chains is less than the number of SIMs, leading to unnecessary network resource consumption and paging message retransmissions.
Innovation Solution
Implementing paging assistance information transmission between SIMs, allowing the connected SIM to inform the core network about the idle SIM's paging preferences, enabling the network to determine whether to page the idle SIM based on this information, thereby reducing unnecessary paging and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless terminal monitors paging for all SIMs independently, then all SIMs can receive paging messages, but the number of RX/TX chains required increases
Solution Approach 1:
The patent merges the paging monitoring function for multiple SIMs into a single RX/TX chain by implementing a paging indicator channel that can indicate paging messages for multiple SIMs simultaneously. The network device sends a single paging indicator that the terminal processes to determine which SIM(s) have pending paging messages, eliminating the need for separate monitoring chains for each SIM.
Solution Approach 2:
The paging indicator channel is designed with multi-functionality to serve multiple SIMs simultaneously. A single paging indicator message can indicate paging for one or more SIMs based on the terminal's configuration, allowing the same communication resource to perform multiple paging indication functions for different SIMs.
2Reliability
If the network pages the idle SIM when the connected SIM is active, then all SIMs can be reached, but network resource consumption increases
Solution Approach 1:
The terminal performs preliminary action by sending paging assistance information to the network device before the network initiates paging. This assistance information includes indicators about the terminal's paging monitoring status for different SIMs, allowing the network to pre-determine whether paging is necessary and avoid unnecessary paging transmissions.
Solution Approach 2:
The system implements feedback through the paging assistance information mechanism, where the terminal provides feedback to the network about its paging monitoring capabilities and status. The network uses this feedback to make informed decisions about whether to page the terminal for a specific SIM, thereby avoiding unnecessary network resource consumption.
Data Source
AI summary
According to an example aspect of the present invention, there is provided a method comprising, transmitting, via a first subscriber identity module hosted by a wireless terminal, paging assistance information associated with a second subscriber identity module hosted by the wireless terminal to a core network node serving the second subscriber identity module, wherein said paging assistance information comprises information to be used to determine whether to page the second subscriber identity module when the first subscriber identity module is in connected mode and the second subscriber identity module is in idle mode and receiving, by the wireless terminal, a paging message from the core network node serving the second subscriber identity module in accordance with said paging assistance information when the first subscriber identity module is in connected mode and the second subscriber identity module is in idle mode.