SC-PTM Paging for Group Communications
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Solution Overview
Problem
Current group communication systems face challenges in achieving low latency and efficient call setup for real-time applications like Push-To-Talk (PTT) due to server latency and power consumption issues when devices transition between idle and connected modes, particularly in scenarios with sporadic data transmission patterns.
Innovation Solution
Implementing a Single Cell Point to Multipoint (SC-PTM) transmission mode for early paging in MBMS, allowing for faster activation and notification periods, reducing the time for client nodes to switch from idle to connected mode and enhancing data reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device uses discontinuous reception (DRX) to monitor paging messages at forehand signaled time periods, then power consumption is reduced, but call setup time increases due to the minimum paging cycle interval of 320 ms
Solution Approach 1:
The system performs preliminary actions by pre-synchronizing client nodes to specific time slots for paging message transmission. This allows the network to prepare and transmit paging messages at predetermined times without waiting for the standard DRX cycle, enabling faster call setup while maintaining power efficiency.
Solution Approach 2:
The invention dynamically adjusts the paging mechanism by introducing group-specific synchronization time slots that can be activated on-demand. This dynamic approach allows the system to switch between standard DRX operation and accelerated paging modes based on service requirements, resolving the contradiction between power saving and fast call setup.
2Use of energy by moving object
If the network uses standard paging mechanisms with defaultPagingCycle of 320 ms or longer, then power consumption is optimized, but latency for real-time services deteriorates
Solution Approach 1:
The paging mechanism is segmented into standard paging for non-critical services and accelerated paging for real-time services. By dividing the paging approach based on service type, the system can maintain long paging cycles for power efficiency while providing fast paging paths for time-critical applications like Push-To-Talk.
Solution Approach 2:
The system changes the timing parameters dynamically based on service requirements. For real-time services, it activates group-specific synchronization time slots with shorter intervals, while maintaining the standard defaultPagingCycle for other services, thus optimizing both power consumption and latency according to service needs.
3Use of energy by moving object
If the device enters idle mode during periods of silence, then power consumption is reduced, but data transmission capability is lost until connected mode is restored
Solution Approach 1:
The system prepares for potential data transmission by pre-synchronizing client nodes to specific time slots where paging messages and data can be transmitted. This preliminary synchronization ensures that when data needs to be transmitted, the client is already positioned to receive it quickly without requiring a full mode transition.
Solution Approach 2:
The invention introduces group-specific synchronization time slots as an intermediary mechanism between idle and connected modes. During these synchronized time slots, the client can efficiently receive paging messages and data without being in full connected mode, maintaining a middle ground that balances power consumption and data transmission capability.
Data Source
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Figure 2
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AI summary
A method for paging at least one client node in a group communications system. The method is performed by a control node of the group communications system. The method comprising obtaining a need for paging the at least one client node in the group communications system and transmitting a paging message for the at least one client node in a Single Cell Point To Multipoint, SC-PTM, transmission to the at least one client node.