Mobile Station Sleep Mode Control via Neutral Interval
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Solution Overview
Problem
In IEEE 802.16e communication systems, mobile stations continuously consume power due to constant monitoring, leading to resource waste and increased power consumption, as they transition between sleep and awake modes with unnecessary message transmissions and bandwidth requests.
Innovation Solution
Implementing a neutral interval within the sleep mode operation that allows adaptive transitions between awake and sleep states based on data transmission/reception needs, reducing unnecessary resource usage and power consumption by allowing data exchange during the neutral interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station continuously monitors the downlink to receive data, then the data reception capability is maintained, but the power consumption increases continually
Solution Approach 1:
The mobile station transitions between awake mode and sleep mode periodically, monitoring the downlink only during awake mode intervals. The base station indicates data availability through MOB-TRF-IND messages during sleep mode, allowing the mobile station to wake up only when necessary, thus converting continuous monitoring into periodic action to reduce power consumption while maintaining data reception capability.
2Use of energy by moving object
If the mobile station transitions to sleep mode to reduce power consumption, then the power consumption is minimized, but unnecessary message transmissions occur causing resource waste
Solution Approach 1:
The base station performs preliminary action by sending MOB-TRF-IND messages during the mobile station's sleep mode to indicate data availability in advance. This allows the mobile station to wake up only when necessary, preventing unnecessary MOB-SLP-REQ message transmissions and reducing uplink resource waste while maintaining power savings.
3Ease of operation
If the mobile station transmits MOB-SLP-REQ message to transition to sleep mode, then the sleep mode transition is initiated, but uplink resources are wasted and bandwidth ranging delay occurs
Solution Approach 1:
The invention extracts and eliminates the unnecessary MOB-SLP-REQ message transmission step from the sleep mode transition process. The base station directly assigns the mobile station to sleep mode based on buffer status and channel conditions, removing the uplink resource consumption and bandwidth ranging delay associated with the traditional MOB-SLP-REQ message exchange while maintaining the mobile station's ability to transition to sleep mode.
Data Source
AI summary
A method for controlling a sleep mode operation by a mobile station (MS) in a communication system. In the sleep mode operation control method, after entering a sleep mode, the MS transitions to an awake state in a listening interval. When there is data to transmit or receive to/from a base station (BS) in the awake state, the MS causes a neutral interval following the listening interval to transition to the awake state, and transmits or receives the data. The neutral interval is an interval where transition to the awake state and sleep state is available according to the data transmission/reception of the MS operating in the sleep mode.