Multi-USIM UE Paging Response via Idle Mode Indication
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Solution Overview
Problem
Multi-USIM devices and C-RAT-capable UEs face challenges in responding to paging messages without being connected to both cells simultaneously, due to resource and capability restrictions, leading to potential network inefficiencies and increased paging attempts.
Innovation Solution
A method and apparatus for a UE with multiple USIMs or C-RAT capabilities to respond to a paging message by transmitting a response indicating a request to enter an idle or inactive mode on the cell, thereby informing the network of its preference without needing to maintain simultaneous connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-USIM device responds to paging messages by entering connected mode on multiple cells simultaneously, then the network can maintain communication with the UE on all cells, but the device exceeds its resource and capability restrictions
Solution Approach 1:
Instead of entering connected mode on all paged cells simultaneously, the UE inverts the approach by selecting only one cell to respond to paging while sending a response indication message to other cells to inform them not to initiate paging. This reverses the conventional behavior of maintaining connections on all cells.
Solution Approach 2:
The response indication message acts as an intermediary mechanism that communicates the UE's connection selection decision to the network. This message serves as a mediator between the UE's resource constraints and the network's paging requirements, allowing the network to understand which cell should handle the connection.
2Reliability
If the network continues to page the UE on multiple cells when the UE cannot respond to all, then the UE may miss important communications, but increasing paging attempts increases network overhead
Solution Approach 1:
The UE provides feedback to the network through the response indication message, informing the network about its actual connection status and which cell it has selected for communication. This feedback mechanism allows the network to adjust its paging strategy and stop unnecessary paging attempts on other cells, reducing network overhead while ensuring reliable communication delivery.
3Device complexity
If the UE selects one cell to respond to paging, then resource constraints are satisfied, but the network loses information about which cell the UE prefers for communication
Solution Approach 1:
The response indication message contains information about the UE's selected cell, providing feedback to the network about the UE's connection preference. This allows the network to understand which cell the UE has chosen for communication while the UE maintains its resource constraints by not connecting to all paged cells simultaneously.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for responding to paging by multiple-universal subscription identity module (multi-USIM) devices. A method that may be performed by a user equipment (UE) includes camping on a first cell associated with a first universal subscriber identity module (USIM), wherein the UE has a first USIM and a second USIM; receiving a paging message from the first cell; and transmitting, in response to the paging message, a first response message indicating that the UE requests to enter an idle or inactive mode on the first cell.