Mobile Station CQI Reporting via Subframe Segmentation
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Solution Overview
Problem
In wireless communication systems using multiple component frequency bands, efficiently controlling channel quality indicators (CQIs) is challenging, particularly for mobile stations with limited power, as concurrent transmission of uplink control channels leads to increased Peak-to-Average Power Ratio (PAPR), making it difficult to maintain single-carrier transmission quality.
Innovation Solution
The system prioritizes radio resource allocation for uplink control channels, allowing mobile stations to transmit CQIs efficiently by selecting the appropriate radio resource for each downlink component frequency band, maintaining single-carrier attribute and ensuring power constraints are met, even when multiple channels are allocated in the same subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink control channels are transmitted concurrently in the same subframe, then channel quality indicators for multiple downlink component frequency bands can be reported, but the Peak-to-Average Power Ratio increases and single-carrier transmission quality deteriorates
Solution Approach 1:
The patent segments the CQI reporting by dividing downlink component frequency bands into different groups, where each group is associated with a specific uplink component frequency band. This segmentation allows CQIs for different downlink bands to be reported in different uplink subframes, avoiding concurrent transmission of multiple CQIs in the same subframe and thus maintaining single-carrier transmission quality while still achieving efficient multi-band CQI reporting.
2Loss of information
If multiple uplink control channels are allocated in the same subframe, then comprehensive channel quality information can be obtained, but power constraints of mobile stations with limited power cannot be satisfied
Solution Approach 1:
The patent segments CQI reporting across different uplink subframes by associating different groups of downlink component frequency bands with different uplink component frequency bands. This temporal segmentation distributes the power consumption of CQI reporting over multiple subframes, preventing excessive peak power demands on mobile stations with limited power while ensuring comprehensive channel quality information is collected from all downlink bands.
3Use of energy by moving object
If CQI transmission power is reduced to maintain single-carrier attribute, then power constraints are satisfied, but transmission quality of CQI signals deteriorates
Solution Approach 1:
By segmenting CQI reporting across different uplink subframes and component frequency bands, the patent avoids the need to reduce individual CQI transmission power to maintain single-carrier attribute. Each CQI is transmitted separately in its designated uplink resource, allowing each to maintain adequate transmission power for reliable reception while the overall system maintains single-carrier transmission characteristics.
Data Source
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AI summary
To efficiently control channel quality indicators CQIs in response to a plurality of downlink component frequency bands in a wireless communication system using a plurality of component frequency bands, and enable a mobile station apparatus to suitably transmit signals including the channel quality indicators CQIs, the mobile station apparatus is provided with an uplink control data generation part 407 that generates a channel quality indicator in response to each of the downlink component frequency bands, an uplink control channel selection part 409 that selects a particular radio resource when a plurality of radio resources, which are beforehand allocated from the base station apparatus to transmit the channel quality indicator for each of the downlink component frequency bands, occurs in the same time frame, and a transmission processing part 405 that arranges the channel quality indicator generated in the uplink control data generation part 407 in the radio resource selected in the uplink control channel selection part 409 to transmit to the base station apparatus.