Relay Station Access Uplink Power Control
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Solution Overview
Problem
Current multi-hop relay stations lack the capability for closed-loop power control of terminals, particularly in the access uplink, which hinders efficient power management and throughput enhancement.
Innovation Solution
A method and system that enable fast power control of the access uplink by allowing the relay station to directly perform power control, either by measuring and reporting channel quality information to the base station for centralized control or by independently controlling power based on channel quality measurements, thereby facilitating efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If relay station directly performs power control of access uplink, then power control speed is improved, but relay station complexity increases
Solution Approach 1:
The relay station acts as an intermediary between the subscriber station and base station for power control operations. It measures uplink reception quality, generates power control commands, and transmits them to the subscriber station, enabling fast local power control while the base station maintains overall system coordination through periodic power control messages.
2Loss of time
If relay station performs independent power control, then response time is improved, but coordination with base station becomes more complex
Solution Approach 1:
Power control functionality is segmented between relay station and base station. The relay station handles fast, local power control decisions based on immediate channel conditions, while the base station performs periodic power control considering overall cell conditions. This segmentation enables rapid response times while distributing coordination complexity across multiple entities.
Solution Approach 2:
The relay station implements a feedback mechanism where it measures uplink reception quality, compares it against target values, and generates corresponding power control commands. This closed-loop feedback enables rapid adaptation to channel variations while maintaining coordination with base station through periodic message exchanges.
3Productivity
If centralized base station power control is used, then overall cell power management is improved, but power control speed deteriorates
Solution Approach 1:
The power control system is segmented into two layers: centralized base station power control for overall cell management and distributed relay station power control for fast local response. This hierarchical segmentation allows the base station to maintain comprehensive cell-wide power management while the relay station provides rapid local adjustments, resolving the speed-efficiency tradeoff.
Data Source
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AI summary
Provided are a method of controlling power of an access uplink using a relay station (RS) and a system thereof. When a base station (BS) decides that the subject of power control of the access uplink is itself, the BS generates a message for power control of the access uplink based on channel quality measurement information reported from the RS and transmits the power control message to a subscriber station (SS), and when the BS decides that the subject of power control of the access uplink is the RS, the RS generates a message for power control of the access uplink based on channel quality measurement information and transmits the power control message to the SS. Thus, fast power control of the access uplink can be performed.