Wireless Sleep Mode Control via Autonomous Terminal Scheduling
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Solution Overview
Problem
In wireless access communication systems, particularly the IEEE 802.16e system, managing sleep modes for multiple subscriber terminals is challenging due to exponentially increasing sleep intervals, making it difficult for base stations to control and manage sleep intervals effectively.
Innovation Solution
The method involves generating a group identifier using a connection identifier, assigning index values for sleep periods, and determining listening positions based on these values to synchronize sleep and awake modes across subscriber terminals, reducing the complexity of managing sleep intervals and minimizing traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sleep interval is increased according to exponential power of 2 in IEEE 802.16e system, then power consumption is reduced, but management complexity of sleep mode increases significantly
Solution Approach 1:
The terminal autonomously determines its own sleep and awake times using a predetermined algorithm based on its connection identifier, eliminating the need for the base station to manually manage and coordinate sleep intervals for multiple terminals. The terminal self-manages its sleep mode by calculating listening positions and sleep durations independently.
Solution Approach 2:
The patent changes the management approach from centralized base station control to distributed terminal-based autonomous management, fundamentally altering the system parameter of who controls sleep mode. This transforms the complex coordination problem into a simple autonomous operation for each terminal.
2Use of energy by moving object
If multiple subscriber terminals are managed with individual sleep intervals, then each terminal can optimize its power consumption, but the base station cannot easily manage sleep intervals of multiple terminals
Solution Approach 1:
The patent creates a universal sleep mode management algorithm that all terminals use independently, where each terminal's connection identifier serves multiple purposes: terminal identification and sleep schedule determination. This multi-functional use of the connection identifier simplifies management by eliminating separate control mechanisms.
Solution Approach 2:
Each terminal autonomously manages its own sleep schedule using its unique connection identifier to calculate its specific listening positions and sleep intervals, allowing simultaneous optimization for multiple terminals without requiring base station coordination for each individual terminal.
3Reliability
If sleep mode control messages are transmitted frequently, then sleep mode can be accurately controlled, but traffic for broadcasting messages increases
Solution Approach 1:
The terminal pre-calculates its sleep and awake schedule based on its connection identifier before entering sleep mode. The listening position and sleep duration are determined in advance using a predetermined algorithm, eliminating the need for frequent control messages during sleep mode operation.
Solution Approach 2:
The terminal independently determines its sleep parameters using its own connection identifier without requiring continuous base station instructions, significantly reducing the traffic volume needed for sleep mode control while maintaining accurate timing.
Data Source
AI summary
A method for controlling a sleep mode in a wireless access communication system is disclosed. In the method, a base station and a subscriber terminal share a predetermined number of SI for a sleep mode control, and the base station sets a paging position by means of a predetermined BCID assigned to subscriber terminals and the SI, so that the base station can easily manage sleep intervals of the subscriber terminals. Further, since information for a sleep interval scheduling is not transmitted when the subscriber terminal shifts to a sleep mode, the amount of traffic between the subscriber terminal and the base station can be reduced.