Mobile Subscriber Uplink Transmission Diversity
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining the quality of uplink transmission, particularly for mobile subscribers at the edge of cells, where transmission path losses and interference are significant, leading to insufficient power and signal quality issues.
Innovation Solution
Mobile subscribers identify uplink transmission conditions and adapt by transmitting messages over multiple frames, using different sets of sub-carriers and introducing cyclic delays between antennas, thereby enhancing transmission diversity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile subscribers transmit messages over single uplink frames, then transmission speed is maintained, but transmission quality deteriorates due to path losses and interference at cell edges
Solution Approach 1:
The patent segments the uplink transmission by dividing a single message into multiple transmissions across different uplink frames. The mobile subscriber transmits the same message over multiple frames (e.g., frame n, frame n+1, frame n+2) with cyclic delays between antennas, allowing the base station to combine these transmissions for improved signal quality and reliability.
2Reliability
If mobile subscribers use single carrier frequency, then device complexity is reduced, but transmission reliability deteriorates due to interference and fading
Solution Approach 1:
The patent extends the transmission from a single frequency dimension to multiple frequency dimensions by transmitting the same message over different sets of sub-carriers in different uplink frames. This frequency diversity approach spreads the transmission across multiple frequency resources, improving reliability through frequency diversity while managing complexity through structured resource allocation.
3Reliability
If mobile subscribers transmit over multiple frames with different sub-carriers, then transmission diversity is improved, but power spectral density decreases
Solution Approach 1:
The patent changes the transmission parameters by introducing cyclic delays between different antennas across multiple uplink frames. The mobile subscriber transmits with cyclic delays between antennas, where the delay varies between frames, creating time and frequency diversity. This parameter variation improves transmission diversity while the total power is distributed across the multiple frames and frequency resources.
Data Source
AI summary
Methods and apparatuses of a mobile subscriber transmitting information to a base station are disclosed. One method includes identifying an uplink transmission condition. If the uplink transmission condition is identified, the mobile subscriber transmits a message over multiple uplink frames using multiple uplink frame types. The mobile subscriber may inform the base station that it is transmitting the message over the multiple uplink frames.