Radio Communication Apparatus Dynamic TDM FDM Mode Switching
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Solution Overview
Problem
In LTE communication systems, base stations face challenges in correctly switching between TDM and FDM transmission modes due to the inability to accurately control the transmission power of a PUSCH based on PHR_pusch alone, leading to potential deterioration in reception performance.
Innovation Solution
The proposed solution involves a radio communication apparatus and method that includes a trigger information report determination section and a transmission mode control section to determine and transmit trigger information for switching between TDM and FDM transmission modes, thereby allowing for accurate control of transmission power and mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FDM transmission mode is applied, then PUSCH reception performance is improved (data not punctured), but CM increases and transmission power margin decreases
Solution Approach 1:
The patent implements dynamic switching between TDM and FDM transmission modes based on real-time PHR conditions. The base station determines the appropriate multiplexing mode by evaluating the mobile station's power headroom, allowing the system to adapt to changing channel and power conditions. This dynamic approach enables the system to select FDM when power margin is sufficient to maintain single carrier characteristics, and TDM when power constraints require reduced CM.
2Power
If TDM transmission mode is applied, then CM is controlled and power margin is maintained, but PUSCH reception performance deteriorates (data punctured)
Solution Approach 1:
The system dynamically selects between TDM and FDM modes based on PHR evaluation. When the base station determines that the mobile station has sufficient power headroom, it commands FDM transmission to improve PUSCH reception performance. When power margin is insufficient, the system switches to TDM mode to maintain power control and prevent excessive CM, thus resolving the performance-power tradeoff adaptively.
3Loss of information
If PHR_pusch is used for mode switching control, then signaling overhead is reduced, but transmission mode switching accuracy decreases
Solution Approach 1:
The patent introduces PHR_pucch as an intermediary parameter that indirectly reflects the mobile station's power status and channel conditions. Instead of directly reporting detailed power measurements, the mobile station calculates PHR based on PUCCH transmission power requirements, which serves as a mediator for the base station to determine appropriate transmission mode. This intermediary approach reduces signaling overhead while maintaining sufficient accuracy for mode switching decisions.
4Reliability
If FDM transmission mode is used, then data reception quality is improved, but single carrier characteristics are lost and CM increases
Solution Approach 1:
The system dynamically adjusts the multiplexing mode based on real-time power headroom conditions. When the base station determines that the mobile station has sufficient power margin, it commands FDM transmission to improve data reception quality. When power constraints are detected, the system switches to TDM mode to maintain single carrier characteristics and control CM. This dynamic adaptation allows the system to optimize between reception quality and carrier characteristics based on current conditions.
Data Source
AI summary
A radio communication apparatus is provided, which includes a receiver and a controller. The receiver, in operation, receives a first power headroom (PHR), which is obtained by subtracting a transmit power for a data channel from a maximum transmit power at a mobile station and which is transmitted from the mobile station, and receives a second PHR, which is obtained by subtracting the transmit power for the data channel and a transmit power for a control channel from the maximum transmit power at the mobile station and which is transmitted from the mobile station. The controller, in operation, selectively sets a simultaneous transmission of the data channel and the control channel in different frequency bands to be performed by the mobile station. When the data channel and the control channel are simultaneously transmitted in different frequency bands from the mobile station, the second PHR is obtained and transmitted from the mobile station.