Relay Station Mode Transition Control for Wireless Power Management
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Solution Overview
Problem
In wireless communication systems using relaying, the processing delay of relay stations can cause asynchronous transmission timing between base stations and mobile stations, leading to missed paging or traffic indication messages, which hinders efficient power management in idle or sleep modes.
Innovation Solution
The proposed solution involves the relay station controlling mode transitions of mobile stations by determining and managing mode transition information, including processing delays, to ensure timely communication of data presence messages, thereby allowing the mobile stations to enter idle or sleep modes effectively and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS transmits paging or traffic indication messages to the MS based on listening duration information, then the MS can receive notifications about data presence, but the processing delay of the RS may cause asynchronous transmission timing between the BS and the MS, leading to missed messages
Solution Approach 1:
The BS determines the transmission timing of paging or traffic indication messages in advance by considering the listening duration information and the processing delay of the RS. This preliminary timing adjustment ensures that messages are transmitted early enough to account for the RS processing delay, allowing the MS to receive them during its listening period despite the relay station's delay.
2Use of energy by moving object
If the MS operates in idle mode or sleep mode to reduce power consumption, then energy efficiency is improved, but the MS can only receive downlink signals during listening periods, requiring precise timing coordination
Solution Approach 1:
The MS provides listening duration information to the BS, creating a feedback mechanism. The BS uses this feedback to determine the appropriate transmission timing for paging or traffic indication messages, ensuring that messages are sent at times when the MS is actually listening, thus coordinating timing without requiring complex continuous monitoring from the MS.
3Area of stationary object
If the RS is introduced to provide relay service and expand cell coverage, then network flexibility and coverage are improved, but the processing delay of the RS creates asynchronous transmission timing
Solution Approach 1:
The BS determines the transmission timing of messages in advance by considering the known processing delay of the RS. This preliminary timing adjustment compensates for the delay introduced by the relay station, ensuring that messages arrive at the MS during its listening period despite the additional processing time required by the RS.
Data Source
AI summary
An apparatus and method for controlling a mode transition of a mobile station (MS) in a relay station (RS) in a wireless communication system are provided, in which upon receipt of a mode transition request signal from at least one MS within a service area of the RS, the RS determines whether to approve the mode transition request, sets management information for the mode transition of the MS, if the mode transition request of the MS is approved, and transmits the management information to the MS.