Multi-carrier CQI Feedback via Single Uplink 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 MC-WCDMA environments.
Innovation Solution
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 resource allocation and prioritization of the best channel quality measurements, reducing the need for multiple uplink control channels and minimizing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel quality measurements for multiple frequency carriers are reported over separate uplink control channels, then measurement precision is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent combines multiple channel quality measurement reports for different frequency carriers into a single uplink control channel (HS-DPCCH). Instead of creating separate uplink control channels for each carrier, the invention merges all CQI reports into one unified reporting mechanism, thereby reducing device complexity and resource consumption while maintaining the ability to report precise channel quality measurements for multiple carriers
Solution Approach 2:
The HS-DPCCH uplink control channel is designed to serve multiple functions: it reports channel quality measurements for the primary downlink carrier and simultaneously reports measurements for multiple secondary frequency carriers. This multi-functional approach eliminates the need for separate dedicated uplink control channels for each carrier, reducing overall system complexity while preserving measurement precision
2Loss of information
If multiple uplink control channels are allocated for multi-carrier CQI reporting, then channel quality information completeness is improved, but resource consumption increases
Solution Approach 1:
The invention merges channel quality information for multiple frequency carriers into a single uplink control channel report. The CQI messages include measurements for the primary carrier and multiple secondary carriers, consolidated into one transmission on the HS-DPCCH, thereby maintaining information completeness while reducing resource consumption by eliminating redundant separate channel allocations
3Speed
If channel quality reports are transmitted frequently for all carriers, then link adaptation speed is improved, but loss of time due to processing overhead increases
Solution Approach 1:
The patent implements periodic channel quality reporting where the mobile terminal transmits CQI reports for multiple frequency carriers at regular intervals through the HS-DPCCH. This periodic action enables the Node B to perform link adaptation at optimized intervals, balancing the need for fast adaptation with the processing overhead, thereby reducing unnecessary frequent transmissions while maintaining effective link adaptation speed
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 3× 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.