Power Control for Forward Access Channel Using Shared Downlink Signals
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Solution Overview
Problem
Existing communication systems face challenges in efficiently managing power for Forward Access Channel (FACH) transport channels, leading to increased complexity, reduced resource usage, and suboptimal capacity due to difficulties in estimating individual User Equipment (UE) power needs and the need for increased data communication over the air interface.
Innovation Solution
Implementing power control on the Downlink Shared Control Channel (DSCH) to derive and apply power control information to the FACH, allowing for optimized power management by adjusting transmit power or scheduling data based on determined power requirements, thereby improving resource allocation and reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional power control methods are used on FACH, then individual UE power needs can be addressed, but the complexity of measurement and processing operations increases
Solution Approach 1:
The patent introduces DSCH as an intermediary channel to carry power control information that indirectly controls FACH power. Instead of direct UE measurements and calculations, the base station uses DSCH to transmit power control commands that the UE applies to FACH receptions, simplifying UE complexity while maintaining accurate power control.
Solution Approach 2:
The patent replaces the mechanical measurement and processing system at the UE with a signal-based control system. Power control information is transmitted via DSCH signals, and the UE applies these signals to adjust FACH power without performing complex local measurements and calculations.
2Use of energy by stationary object
If conventional power control methods are used on FACH, then power management can be implemented, but data communication over the air interface increases
Solution Approach 1:
The patent merges power control functionality into the existing DSCH data communication channel. Power control information is combined with regular data transmissions on DSCH, eliminating the need for separate power control signaling and reducing overall air interface overhead.
Solution Approach 2:
The DSCH channel is given multi-functionality, serving both as a data communication channel and as a power control information channel for FACH. This universal usage reduces the need for dedicated power control signaling resources.
3Ease of operation
If simple power control operation is used, then implementation is straightforward, but optimal resource usage is not achieved
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors FACH reception quality and adjusts power control information sent via DSCH accordingly. This feedback loop enables optimal resource usage while keeping the UE operations simple - the UE just applies received power control commands without needing to perform complex optimizations.
Data Source
AI summary
Power control in a communication system (100) employing a Downlink Shared Control Channel (DSCH) and a Forward Access Control Channel (FACH) is described. The method includes, applying power control on the Downlink Shared Control Channel; deriving power control information from the power control on the Downlink Shared Control Channel; and applying to the Forward Access Control Channel the derived power control information from the power control on the Downlink Shared Control Channel in order to produce power control on the Forward Access Control Channel. The power control of the Forward Access Control Channel may be implemented by scheduling data in response to the derived power control information.