RRH Transmission Control for Uplink CoMP Data Volume Reduction
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Solution Overview
Problem
Conventional uplink CoMP techniques in radio communication systems with MAC-PHY split or SPP schemes unnecessarily transmit bit data and reception quality information from multiple RRHs to a BBU, increasing the total transmission data volume without contributing to improved radio transmission characteristics.
Innovation Solution
Implementing a radio communication system where RRHs control the transmission of bit data and reception quality information based on measured signal power or SNR thresholds, discarding data that does not contribute to improved transmission characteristics and transmitting only data with sufficient signal quality to the BBU, thereby reducing the total transmission data volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bit data and reception quality information are transmitted from all RRHs to the BBU in uplink CoMP, then the BBU can perform selective combining to improve reception quality, but the total transmission data volume between RRHs and BBU increases unnecessarily
Solution Approach 1:
The patent extracts only the necessary information (bit data and reception quality from RRHs meeting the threshold) and transmits it to the BBU, rather than transmitting all data from all RRHs. This is achieved by comparing reception quality against a predetermined threshold and selectively transmitting only from RRHs that meet the criterion, thereby reducing transmission data volume while maintaining the reliability benefits of selective combining.
2Productivity
If multiple RRHs constantly perform CoMP with multiple terminal apparatuses, then the system capacity increases, but the transmission data volume from all RRHs to BBU increases significantly
Solution Approach 1:
The patent applies different transmission behaviors to different RRHs based on their local reception quality characteristics. Each RRH independently evaluates its own reception quality against the threshold and makes a local decision about whether to transmit, rather than all RRHs transmitting uniformly. This localized quality-based filtering enables multiple RRHs to participate in CoMP (maintaining system capacity) while reducing the total transmission volume by excluding RRHs with poor reception quality.
Data Source
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AI summary
A radio apparatus in a radio communication system that includes the radio apparatus and a signal processing apparatus that function as a base station, includes a channel estimation unit that, on the basis of a radio signal transmitted from a terminal apparatus, measures a reception quality of the radio signal; and a transmission control unit that, on the basis of the reception quality measured by the channel estimation unit, controls transmission, to the signal processing apparatus, of bit data or a log likelihood ratio obtained from the radio signal.