Serving Sector Power Control for Wireless Interference
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Solution Overview
Problem
Wireless communication systems face interference and performance degradation due to uncoordinated transmissions from neighboring sectors, particularly at sector edges, where terminals lack accurate information to set optimal transmit power levels.
Innovation Solution
An access point generates and transmits power control information to terminals within its sector, overriding terminal-based computations to determine appropriate transmit power levels, considering interference from non-serving sectors and quality of service requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals autonomously compute transmit power levels, then device autonomy and operational flexibility are improved, but interference from uncoordinated transmissions in neighboring sectors increases
Solution Approach 1:
The serving sector acts as an intermediary between the terminal and the network, receiving power control information from the network and relaying it to the terminal. This mediator approach allows centralized power control decisions to be implemented without requiring direct terminal-autonomous computation, thereby reducing interference while maintaining operational efficiency
Solution Approach 2:
The system implements feedback loops where terminals report channel quality and interference measurements to the serving sector, which then adjusts power control information accordingly. This feedback mechanism enables dynamic optimization of transmit power levels, balancing terminal autonomy with interference reduction through continuous adaptation
2Reliability
If serving sector directs transmit power levels, then interference coordination and quality of service are improved, but device autonomy and operational flexibility are reduced
Solution Approach 1:
The serving sector pre-computes and provides power control information to terminals before transmissions occur, based on network-wide knowledge of channel conditions and interference patterns. This preliminary action ensures that terminals operate with optimized power levels without needing to autonomously compute them, maintaining reliability while reducing operational complexity at the terminal
Solution Approach 2:
While the serving sector directs power levels, the terminal still autonomously applies the provided power control information to its transmissions and reports its own measurements back to the serving sector. This self-service approach maintains a degree of device autonomy in execution and feedback, even while centralized direction improves quality of service
3Reliability
If terminals transmit at higher power levels, then signal coverage and connectivity are improved, but battery consumption increases
Solution Approach 1:
The serving sector dynamically adjusts the power control information parameter based on terminal position, channel conditions, and quality of service requirements. This parameter change approach allows terminals to transmit at lower power levels when possible (conserving battery) while automatically increasing power when signal coverage or connectivity requires it, optimizing the trade-off between energy consumption and communication reliability
4Reliability
If terminals transmit at higher power levels, then signal coverage is improved, but interference to neighboring sectors increases
Solution Approach 1:
The serving sector provides differentiated power control information to different terminals based on their specific locations, channel conditions, and interference environments. This local quality approach ensures that each terminal transmits at the minimum necessary power level to achieve adequate coverage in its specific context, rather than using uniform high power levels that would cause excessive interference to neighboring sectors
Solution Approach 2:
The terminal copies the power control information provided by the serving sector and applies it to its transmissions. This copying mechanism ensures that centralized interference coordination decisions are accurately implemented at the terminal level, allowing signal coverage to be maintained while interference to neighboring sectors is controlled through the serving sector's global perspective
Data Source
AI summary
Systems and methodologies are described that facilitate serving sector directed transmit power control in a wireless communication environment. Under certain conditions, an access point can have better data with which to determine appropriate power levels than an individual terminal. Accordingly, an access point can transmit power control information to one or more terminals supported by the access point overriding normal power determination procedures. In particular, power control information can be included within an assignment message that designates resources (e.g., frequency, time) assigned to a terminal. Power control information can be based upon SNR, quality of service requirements, interference information, any other relevant information or any combination thereof.