Dual-SIM User Equipment DRX Coordination for Data Transmission
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Solution Overview
Problem
Dual-SIM dual-standby user equipment faces inefficiencies in data transmission due to the lack of coordination between independent DRX cycles of different public land mobile networks, leading to data loss and system inefficiency when switching between networks for paging channel reception.
Innovation Solution
Implementing a method where the user equipment operates in a discontinuous reception scheme with a defined paging occasion time interval for one network, preventing data transmission during this interval to avoid interference and ensure reliable data reception from the second network, by transmitting timing information to coordinate data transmission with the second network's schedule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment monitors the paging channel during DRX cycles for the first public land mobile network, then the user equipment can receive paging messages from the first network, but data transmission from the second public land mobile network is interrupted
Solution Approach 1:
The network side performs preliminary actions by scheduling data transmission before the paging occasion time interval begins and preventing scheduling during this interval. This ensures data transmission completes before the UE needs to monitor the paging channel, eliminating the conflict between paging reception and data transmission
Solution Approach 2:
The network side acts as an intermediary by coordinating between the paging channel monitoring requirements and data transmission scheduling. The network controller manages the timing alignment between DRX cycles and data transmissions, preventing data transmission during paging occasions and ensuring seamless operation
2Adaptability or versatility
If the user equipment switches between different public land mobile networks for paging reception, then the user equipment can maintain connectivity with multiple networks, but data packet loss increases
Solution Approach 1:
The network side schedules data transmissions in advance, completing all data transmissions before the UE switches to monitor paging channels of other networks. This preliminary scheduling prevents data packet loss by ensuring no data is transmitted during network switching periods
Solution Approach 2:
The system implements feedback mechanisms where the network side receives information about DRX cycle timing and paging occasion intervals, then uses this feedback to optimize data transmission scheduling. This ensures transmissions are aligned with UE availability across multiple networks
Data Source
AI summary
A method for using a user equipment with a first public land mobile network and a second public land mobile network includes operating the user equipment, with respect to the first public land mobile network, according to a discontinuous reception scheme in an idle mode of the user equipment and operating the user equipment, with respect to the second public land mobile network, in a connected mode of the user equipment. In the connected mode with respect to the second public land mobile network, transmission of data from the second public land mobile network to the user equipment is prevented during a paging occasion time interval of the discontinuous reception scheme corresponding to the first public land mobile network.