Point-to-Multipoint Power Control via Shared Uplink Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In point-to-multipoint radio communication systems, existing power control methods are inefficient, leading to wasteful power usage and interference, as they require separate power control loops for each secondary station and allocate excessive channel resources for transmit power control commands.
Innovation Solution
Implementing a method where multiple secondary stations transmit common power control signals in a shared time period and frequency allocation, allowing the primary station to adjust transmit power based on combined signals, reducing the need for individual resource allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power control loops are operated for each secondary station, then individual receive quality can be maintained, but channel resources are excessively consumed
Solution Approach 1:
The patent merges separate power control loops for multiple secondary stations into a single common power control loop. Instead of allocating individual uplink channels for TPC commands from each secondary station, the invention allows multiple secondary stations to share common uplink resources and transmit their power control commands in a multiplexed manner, thereby reducing the total channel resources required while maintaining individual receive quality monitoring
2Reliability
If transmit power is increased to satisfy poorest reception conditions, then all secondary stations can receive data, but power is wasted and interference increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment by continuously monitoring receive quality from multiple secondary stations through their TPC commands and adapting the downlink transmit power in real-time. The system transitions from static power levels to dynamic power control, increasing power only when necessary to maintain adequate reception at the poorest quality station, and reducing power when all stations experience good reception conditions, thereby eliminating wasteful power consumption and reducing interference
3Measurement precision
If TPC commands are transmitted on individual channels, then power control accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent makes uplink channel resources universal by allowing them to serve multiple functions: data transmission and power control command transmission. Instead of dedicating separate channels exclusively for TPC commands, the invention enables secondary stations to transmit power control information on shared uplink resources, thereby reducing device complexity related to channel allocation and management while maintaining power control accuracy through proper signal processing and command detection
Data Source
AI summary
A transmit power control scheme for use in point-to-multipoint communication uses a random access channel for power control signals transmitted by the receiving stations (200).