Two-Stage Paging Signal Segmentation for Wireless Terminals
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Solution Overview
Problem
Existing paging systems in wireless communication face challenges in achieving low paging latency for emerging services like push-to-talk without significantly increasing battery power consumption, as large paging cycles conserve power but result in high latency, and reducing cycle duration increases power consumption due to frequent wake-ups.
Innovation Solution
The implementation of a two-stage paging method using non-coherent and coherent modulation techniques, where a first paging signal indicates the presence of a message without requiring channel estimation, followed by a second signal with detailed information, allowing wireless terminals to determine if they need to wake up and perform channel estimation only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large paging cycle is used to conserve battery power, then power consumption is reduced, but paging latency increases
Solution Approach 1:
The paging signal is segmented into two stages: a first paging signal that provides basic paging indication, and a second paging signal that provides detailed paging information. This segmentation allows the wireless terminal to process only the essential first signal quickly, determine whether full paging information is needed, and avoid complete channel estimation and processing when not necessary, thus reducing power consumption while maintaining low latency for actual pages
Solution Approach 2:
The wireless terminal performs partial channel estimation and processing only when the first paging signal indicates that a second paging signal will be transmitted. When no paging is present, the terminal performs minimal processing and returns to sleep state, avoiding the excessive power consumption associated with full channel estimation and processing that would be required if the terminal always monitored the complete paging channel
2Loss of time
If the paging cycle is reduced to decrease latency, then paging latency is improved, but battery power consumption increases due to frequent wake-ups
Solution Approach 1:
By segmenting the paging signal into two stages, the system enables shorter paging cycles because the first paging signal can be processed quickly without requiring full channel estimation. This allows the terminal to wake up more frequently with minimal power consumption, process the first signal rapidly, and return to sleep state if no paging is present, thus achieving low latency while maintaining power efficiency
3Reliability
If channel estimation is performed during each wake-up period to receive DLPG channel, then reliable signal reception is achieved, but battery power consumption increases significantly
Solution Approach 1:
The wireless terminal performs channel estimation only partially and only when necessary - specifically, when the first paging signal indicates that a second paging signal will be transmitted. For the first paging signal itself, the terminal uses simplified processing without full channel estimation, thus maintaining sufficient reception reliability for the critical paging indication while dramatically reducing power consumption compared to performing full channel estimation at every wake-up
Data Source
AI summary
Methods and apparatus for efficient two-stage paging wireless communications systems are described. Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using non-coherent modulation) into a first paging signal and communicated from a base station to wireless terminals. WTs wake-up, receive the first paging signal and quickly ascertain whether its paging group should expect a second paging signal, if so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates (using coherent modulation) a number of second message information bits into a second paging signal and transmits the signal to WTs. From the information in first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit an acknowledgement signal on a dedicated uplink resource.