Subcarrier Selection for Multicast Reception Quality
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Solution Overview
Problem
Conventional radio transmission methods for MBMS in mobile communication systems face challenges in maintaining reception quality while increasing system capacity, as boosting transmission power for multicasting or broadcasting interferes with other cells and reduces dedicated channel capacity.
Innovation Solution
A radio transmission apparatus and method that acquire reception quality information from multiple receivers, dynamically set subchannels for data transmission among multiple subchannels of common physical channels, and control transmission power to optimize data delivery, thereby minimizing interference and enhancing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power of common channel is increased to ensure reception quality for all receivers, then reception quality is improved, but interference against other cells increases and system capacity decreases
Solution Approach 1:
The common physical channel is divided into multiple subchannels, each with different transmission powers. The base station segments the channel resources and assigns appropriate subchannels to different receivers based on their reception capabilities, allowing simultaneous service to multiple receivers without requiring maximum power for all transmissions.
Solution Approach 2:
Different subchannels are assigned different transmission power levels according to the specific reception requirements of target receivers. Receivers with good reception quality use subchannels with lower transmission power, while receivers with poor reception quality use subchannels with higher transmission power, optimizing both system capacity and individual reception quality.
2Reliability
If transmission power of common channel is increased to ensure reception quality, then reception quality is improved, but capacity of dedicated channel decreases
Solution Approach 1:
The total transmission power is segmented and allocated to different subchannels based on reception quality requirements. This allows the system to use minimum necessary power for common channel transmissions while preserving more power for dedicated channel communications, thereby maintaining dedicated channel capacity.
Solution Approach 2:
The base station dynamically selects and switches between different subchannels based on real-time reception quality information from receivers. This dynamic adaptation allows the system to optimize power usage continuously, ensuring reception quality while minimizing impact on dedicated channel capacity.
3Reliability
If transmission power is increased to deliver data surely to all receivers, then data delivery reliability is improved, but interference against other cells increases
Solution Approach 1:
Each subchannel is configured with transmission power appropriate for its specific reception scenario. Receivers located in cells with good signal conditions receive data on subchannels with lower transmission power, minimizing interference to other cells, while receivers in poor signal conditions receive data on subchannels with higher transmission power to ensure reliable delivery.
Solution Approach 2:
The system changes the transmission power parameter of different subchannels based on reception quality feedback from receivers. By adjusting this parameter dynamically, the system ensures reliable data delivery to each receiver while minimizing overall interference to other cells through optimized power distribution.
Data Source
AI summary
A radio transmission apparatus and method for multicasting or broadcasting common data to a plurality of radio receiving apparatuses. The apparatus and method acquire per-subcarrier reception quality information from a radio receiving apparatus. A subcarrier is selected for the multicasting or broadcasting among a plurality of subcarriers, each of which has a different frequency, based on the acquired per-subcarrier reception quality information. And the transmission power of the selected subcarrier is controlled.