Group-Based Sleep Mode Management for Wireless Terminals
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Solution Overview
Problem
The existing wireless communication systems face increased system overhead and performance deterioration due to the base station transmitting traffic indication messages to each terminal with similar sleep and listening windows, leading to inefficient power management.
Innovation Solution
A sleep mode management method that groups terminals with similar sleep and listening windows, using a bitmap to indicate data transmission to specific groups, allowing terminals to determine if they need to awaken based on their group ID within a superframe, thereby reducing unnecessary data checks and system overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits traffic indication messages to each terminal individually, then each terminal can be notified of downlink traffic accurately, but system overhead increases and performance deteriorates
Solution Approach 1:
The patent combines multiple individual traffic indication messages into a single group-based notification message. Terminals with similar sleep and listening window patterns are grouped together, and a single traffic indication message is transmitted to the group representative terminal, which then forwards the notification to other terminals in the group. This merging approach reduces the number of messages transmitted over the air interface, thereby decreasing system overhead while maintaining accurate traffic notification for each terminal.
2Reliability
If the base station transmits traffic indication messages to each terminal individually, then each terminal receives accurate traffic information, but system performance deteriorates
Solution Approach 1:
The patent merges multiple individual terminal notifications into a single group-based notification mechanism. By grouping terminals with similar sleep mode parameters and using a representative terminal to receive and distribute traffic indications, the system reduces processing overhead and improves overall system performance while maintaining accurate traffic notification delivery to all terminals.
3Reliability
If terminals check all data in superframe during listening window, then no data is missed, but power consumption increases
Solution Approach 1:
The patent extracts and processes only the group identifier information from the traffic indication message during the listening window. Terminals compare their group ID with the notified group ID without examining the actual data content. This extraction approach allows terminals to determine with high confidence whether they need to wake up for data reception, significantly reducing power consumption while maintaining reliable data reception completeness.
Solution Approach 2:
The patent applies partial action by having terminals perform only a partial check (group ID comparison) rather than a complete check (examining all data fields) during the listening window. This partial verification is sufficient to determine whether full data reception is necessary, thereby reducing power consumption while ensuring no data is missed.
Data Source
AI summary
During a listening window after a sleep window, a terminal receives a control signal that indicates existence of data corresponding to the terminal, and enters a sleep window if no data corresponding to the terminal exists.