Mobile Station TFC Selection for Power-Constrained WCDMA Transmission
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Solution Overview
Problem
In WCDMA wireless communication systems, mobile stations face challenges in selecting transport format combinations for simultaneous data transmission in EUDCH and DPCH channels without exceeding maximum transmission power, leading to potential power shortages and reduced data quality.
Innovation Solution
A method where a mobile station calculates and compares transmission powers for multiple TFCs in both channels, selecting combinations that keep total power within limits, ensuring data can be transmitted without reducing channel power, thus maintaining quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station selects TFCs to maximize transmission rate in both EUDCH and DPCH channels, then the data throughput is improved, but the total transmission power exceeds the maximum power limit
Solution Approach 1:
The mobile station dynamically adjusts the transport format combination selection based on current channel conditions and power availability. The TFC selection is not fixed but adapts in real-time to balance throughput requirements with power constraints, allowing the system to operate at optimal performance levels under varying conditions
Solution Approach 2:
The system changes the transmission parameters (transport format combinations) to optimize performance. By selecting different TFCs from available options based on calculated power requirements, the system adjusts transmission rate, coding scheme, and resource allocation to achieve maximum throughput within power limits
2Power
If the mobile station reduces transmission power to stay within maximum power limits, then power constraints are satisfied, but data quality deteriorates
Solution Approach 1:
The mobile station performs preliminary calculations of transmission power requirements for each available TFC combination before actual transmission. By pre-evaluating power needs and comparing them against the maximum power limit, the system identifies suitable TFCs that satisfy both power constraints and quality requirements, preventing power shortages before they occur
Solution Approach 2:
The system uses feedback from power calculations and channel conditions to make informed TFC selections. The mobile station continuously monitors transmission requirements and adjusts TFC choices based on calculated power margins, ensuring that quality requirements are met while staying within power limits
3Productivity
If the mobile station selects TFCs without considering total power constraints, then individual channel performance is optimized, but power shortage occurs leading to reduced overall system reliability
Solution Approach 1:
The mobile station merges the TFC selection processes for EUDCH and DPCH channels into a unified power-aware selection mechanism. Instead of selecting TFCs for each channel independently, the system evaluates combined power requirements of TFC pairs, ensuring that the sum of transmission powers for both channels remains within the maximum power limit while optimizing overall system reliability
Data Source
AI summary
In a method of selecting a transport format combination according to the present invention, a mobile station calculates the transmission power of a first physical channel using a first TFC with respect to each of first TFCs, and determines whether the mobile station is in a transmission capable state or not. Then, the mobile station calculates the sum of the transmission power of first and second physical channels using first and TFCs, with respect to each of combinations of the first and second TFCs, and determines whether the mobile station is in the transmission capable state or not. Then, the mobile station selects a first TFC from the first TFCs wherein the mobile station is in the transmission capable state. Then, the mobile station selects a second TFC from the second TFCs which are included in combinations wherein the mobile station is in the transmission capable state among the combinations including the selected first TFC. Thereafter, the mobile station transmits data in the first and second physical channels using the selected first and second TFCs, respectively.