Multi-Carrier CQI Feedback Over One Uplink Reporting Channel
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Solution Overview
Problem
Current channel quality reporting in multi-carrier WCDMA systems is limited, as existing technologies only support feedback for a single downlink carrier, hindering the full utilization of advanced radio communication features in multi-carrier environments.
Innovation Solution
A method where a radio base station instructs a mobile terminal to report channel quality measurements for multiple frequency carriers over a single uplink channel, allowing for efficient use of radio resources and dynamic reallocation of resources based on these reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel quality feedback is provided for multiple downlink carriers, then system capacity and resource allocation efficiency are improved, but the complexity of the feedback mechanism and uplink channel usage increases
Solution Approach 1:
The feedback mechanism is segmented by time, with each downlink carrier's channel quality measured and reported in separate reporting intervals. The mobile terminal measures channel quality for multiple carriers but reports them sequentially rather than simultaneously, dividing the feedback task into manageable time slots that can be handled by existing single-carrier feedback infrastructure.
Solution Approach 2:
The patent implements periodic channel quality reporting where the mobile terminal reports channel quality measurements for different downlink carriers in successive reporting intervals. This periodic approach allows systematic collection of multi-carrier feedback using the existing periodic single-carrier feedback mechanism, avoiding the need for complex simultaneous multi-carrier reporting.
2Productivity
If multiple frequency carriers are monitored for channel quality, then resource allocation efficiency is improved, but the uplink channel resources are consumed more rapidly
Solution Approach 1:
The uplink channel resource consumption is segmented across multiple reporting intervals rather than concentrated in a single feedback transmission. By dividing the feedback of multiple carriers into successive time slots, the patent distributes the resource consumption over time, allowing efficient multi-carrier monitoring while preventing rapid depletion of uplink resources.
3Adaptability or versatility
If conventional single-carrier feedback is used in multi-carrier systems, then backward compatibility is maintained, but the ability to exploit multi-carrier advantages is lost
Solution Approach 1:
The patent makes the existing single-carrier feedback mechanism universal by enabling it to serve multiple downlink carriers through time-division. The same feedback infrastructure and processing logic used for single-carrier systems is extended to handle multi-carrier feedback by multiplexing reports from different carriers in successive intervals, thus maintaining compatibility while enabling multi-carrier operation.
Data Source
AI summary
A radio base station transmits data symbols to a mobile terminal on multiple frequency carriers, e.g., in accordance with the MC-WCDMA or cdma2000 3x air interface protocols. The radio base station instructs the mobile terminal to report channel quality measurements obtained by the terminal for the multiple carriers over the same uplink channel during successive reporting intervals. According to one embodiment, the mobile terminal reports channel quality by receiving data symbols transmitted on a plurality of frequency carriers in a multi-carrier CDMA environment and measuring channel quality for the different frequency carriers. The mobile terminal reports individual ones of the channel quality measurements over the same uplink channel during successive reporting intervals.