Radio Communication System Dynamic Base Station Selection
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Solution Overview
Problem
Current radio communication systems, such as UMTS, face inefficiencies in data throughput due to suboptimal power control and modulation schemes during soft handover, particularly for packet data links, leading to increased packet corruption and power consumption.
Innovation Solution
Implementing multiple parallel closed-loop power control mechanisms between a mobile station and multiple base stations to dynamically select the best base station for each packet transmission, allowing for individual power control and optimal modulation and coding scheme selection, thereby minimizing packet corruption and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft handover is used to maintain continuous connection with multiple base stations, then connection reliability is improved, but power control accuracy deteriorates because only one set of power control commands is transmitted
Solution Approach 1:
The patent segments the single set of power control commands into multiple separate sets, each corresponding to a different base station. Each base station transmits its own dedicated power control commands, allowing independent and accurate power control for each radio link while maintaining soft handover connectivity.
2Duration of action of stationary object
If the same downlink information is transmitted by all base stations in the active set, then connection continuity is improved, but system throughput deteriorates because the optimum base station cannot be selected for each data packet
Solution Approach 1:
The patent introduces dynamic base station selection for data packet transmission while maintaining static soft handover for control information. The system dynamically chooses the optimum base station based on current radio conditions for each data packet, improving throughput, while control continuity is maintained through the persistent soft handover mechanism.
3Measurement precision
If individual power control is implemented for each base station, then power control accuracy is improved, but signaling requirements increase
Solution Approach 1:
The patent makes the physical control channels universal by using the same channel structure and format for multiple base stations. The channels serve multiple functions: maintaining soft handover connectivity, transmitting individual power control commands from each base station, and enabling dynamic base station selection, thereby achieving individual power control without proportionally increasing signaling overhead.
Data Source
AI summary
A radio communication system comprises a secondary station (110) having a plurality of communication channels (226a,226b,226c) with a plurality of primary stations (100a,100b,100c). Separate closed loop power control is performed for each of the communication channels (226a,226b, 226c). This enables the optimum primary station for transmission of data to the secondary station (110) to be selected. Parameters derived from operation of each power control loop enable optimum setting of channel parameters for each primary station (100a,100b,100c).Such an arrangement is particularly suitable for a high speed downlink data service, where the fast selection of the optimum primary station and/or channel parameters improves link robustness and system throughput.