Reception Apparatus Selective Subband Reporting for OFDMA
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Solution Overview
Problem
In OFDMA communication systems, the reporting of downlink propagation path states from mobile stations to base stations consumes resources, leading to decreased system capacity, increased processing delay, and higher power consumption, particularly in OFDMA-FDD and OFDMA-TDD systems.
Innovation Solution
A transmission/reception apparatus that determines the propagation path state of received multicarrier signals and reports only regions with good propagation path states within the used frequency band, reducing data transmission and power consumption by using a configuration with a determination section, specifying section, and reporting section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink propagation path state information is reported from mobile station to base station on uplink, then the base station can perform frequency scheduling to improve system throughput, but uplink resources are consumed and system capacity decreases
Solution Approach 1:
The patent extracts only the essential information needed for frequency scheduling - specifically, the mobile station reports only the downlink propagation path state information, not complete channel state information. This selective reporting reduces uplink resource consumption while providing sufficient data for the base station to perform frequency scheduling and improve system throughput.
Solution Approach 2:
The patent applies local quality by having the mobile station report propagation path state information specifically for frequency scheduling purposes, rather than reporting all channel characteristics. The base station then uses this localized information to perform scheduling decisions only in the frequency domain, optimizing resource allocation without requiring complete system information exchange.
2Measurement precision
If complete propagation path state information is reported, then scheduling accuracy is improved, but processing delay increases due to decoding requirements
Solution Approach 1:
The patent extracts only the necessary propagation path state parameters needed for frequency scheduling decisions, excluding redundant information. This allows the base station to process the information quickly without complete decoding, reducing processing delay while maintaining sufficient measurement accuracy for effective scheduling.
Solution Approach 2:
The patent uses partial action by reporting only the essential propagation path state information rather than complete channel state information. This partial reporting provides sufficient data for frequency scheduling to achieve good performance while significantly reducing the processing time and complexity at the base station.
3Adaptability or versatility
If uplink/downlink reversibility is used for scheduling, then downlink scheduling can be performed based on uplink measurements, but pilot signals must be transmitted across the entire frequency band consuming uplink resources
Solution Approach 1:
The patent extracts only the necessary propagation path state information from uplink measurements for downlink frequency scheduling, rather than requiring pilot signals across the entire frequency band. This selective information extraction maintains scheduling flexibility while significantly reducing uplink resource consumption by avoiding unnecessary pilot transmissions.
Data Source
AI summary
A transmission/reception apparatus capable of preventing degradation in system capacity, improving system throughput, and minimizing power consumption of an apparatus is disclosed. In this apparatus, a propagation path determining section (131) determines a propagation path state in all the regions in the used frequency band of a received multicarrier signal based on propagation path estimation information such as a channel estimation value and the like calculated in a propagation path estimating section (126), and specifies a frequency region having a good propagation path state from the used frequency band of OFDM. More specifically, the used frequency band is divided into a plurality of frequency bands (subbands), each comprised of smaller predetermined bandwidth, and by selecting a subband having a good propagation path state in the propagation path determining section (131), a frequency region having the good propagation path state is specified. A transmitting section (110) reports the subband information to a base station.