Multi-Carrier CQI Reporting Across Successive Uplink Intervals
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Solution Overview
Problem
Current channel quality reporting in multi-carrier WCDMA systems is limited to feedback for a single downlink carrier, hindering the full utilization of advanced radio communication features offered by HSDPA, such as fast link adaptation and hybrid ARQ, due to the need for separate uplink control channels for each carrier.
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 use of radio resources by individually reporting measurements during successive intervals, ranking, or skipping intervals, thereby enabling the radio base station to reallocate resources based on channel quality feedback from all carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel quality feedback is provided for multiple carriers using separate uplink channels, then measurement precision is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent combines multiple channel quality feedback signals for different carriers onto a single uplink control channel. The mobile terminal multiplexes feedback information from multiple downlink carriers onto one uplink channel using time-division or code-division methods, thereby reducing the number of uplink channels required while maintaining comprehensive channel quality monitoring across all carriers.
Solution Approach 2:
A single uplink control channel is designed to serve multiple functions by carrying channel quality feedback information for multiple different carriers. This universal channel structure allows the system to maintain simplified uplink architecture while achieving comprehensive carrier monitoring and feedback capability.
2Reliability
If multiple uplink channels are used for multi-carrier feedback, then reliability of feedback is improved, but loss of radio resources increases
Solution Approach 1:
By merging multiple carrier feedback signals onto a single uplink control channel, the patent reduces the total number of active uplink channels required. This consolidation decreases radio resource consumption and energy usage while maintaining reliable feedback transmission through proper multiplexing techniques and error protection mechanisms on the shared channel.
3Productivity
If channel quality measurements are reported simultaneously for all carriers, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent segments the channel quality feedback reporting process into discrete time slots or reporting intervals. Instead of requiring simultaneous reporting for all carriers, the system divides the feedback transmission into sequential segments where different carriers are reported in different time periods, thereby reducing the complexity of the reporting mechanism while maintaining efficient feedback collection.
Solution Approach 2:
The patent implements periodic reporting intervals where channel quality measurements are transmitted at regular time intervals rather than simultaneously. This periodic action allows the mobile terminal to systematically report carrier measurements in a structured manner, reducing reporting mechanism complexity while maintaining efficient feedback updates through time-division multiplexing.
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 cmda2000 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.