Channel Sensitive Scheduler for Wireless Capacity
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Solution Overview
Problem
Wireless communication systems, particularly those using CDMA and WCDMA, face challenges in maximizing capacity due to interference and power management, as they are interference-limited and require efficient allocation of resources among multiple users while minimizing signal-to-interference and overhead channel power.
Innovation Solution
A channel-sensitive scheduling method that calculates priority values for mobile stations based on pilot power indicators, using functions such as Priority(i)=Pilot_Power_Max−Pilot_Power(i) or Priority(i)=a(i)*(Pilot_Power_Average(i)/Pilot_Power(i)), to determine the order of transmissions, thereby optimizing resource allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmissions are scheduled without channel condition awareness, then scheduling simplicity is maintained, but system capacity and throughput are limited due to suboptimal resource allocation
Solution Approach 1:
The system performs preliminary channel condition measurements and pilot power estimations before scheduling decisions are made. The scheduler receives channel condition indicators from mobile stations and uses these pre-collected data to make informed scheduling decisions, thereby improving system capacity without adding real-time computational complexity
Solution Approach 2:
The system implements feedback mechanisms where mobile stations transmit channel condition indicators to the scheduler, and the scheduler adjusts transmission schedules based on this feedback. This feedback loop enables the system to adapt to varying channel conditions and optimize resource allocation dynamically
2Productivity
If pilot power is not controlled, then transmission reliability is maintained, but interference to other users increases and system capacity is reduced
Solution Approach 1:
The system dynamically adjusts the pilot power parameter based on channel conditions and scheduling decisions. By changing the pilot power level as a controllable parameter, the system optimizes the balance between transmission reliability and interference generation, thereby improving throughput while minimizing harmful effects on other users
3Use of energy by moving object
If power is not conserved during transmission, then transmission reliability is maintained, but battery life and energy efficiency deteriorate
Solution Approach 1:
The system implements dynamic power control where the mobile station's transmit power is adjusted in real-time based on current channel conditions and scheduling requirements. This dynamic adaptation allows the system to conserve power during favorable channel conditions while maintaining reliability when needed, thereby extending battery life without sacrificing transmission quality
Data Source
AI summary
Method and apparatus for a channel sensitive scheduler for scheduling transmissions in a communication system. The scheduler is defined by a priority function of the channel condition as determined by amount of transmission power needed by a mobile station. In one embodiment the channel condition is determined based on the transmission pilot power of each mobile station and is used to calculate a priority value for each mobile station. The mobile stations are then scheduled to transmit based on the priority value.