Cellular Base Station Power Allocation via Data Flow Observation
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Solution Overview
Problem
Current scheduling procedures in cellular data transmission systems, such as those using the CDMA 2000 standard, do not optimally utilize limited transmission resources, leading to inefficient power allocation and varying transmission rates, which are dependent on random buffered data sizes and reception conditions, without considering quality of service (QoS) or business policies.
Innovation Solution
A method to estimate the power required for radio transmission to each active subscriber unit by observing data ingress over a series of observation windows, calculating relative power levels, and using these estimates for power-dependent channel allocation, enabling more efficient resource management and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current scheduling procedures are used for data transmission, then transmission resources are allocated based on buffered data sizes and reception conditions, but transmission resources are not optimally utilized and power allocation is inefficient
Solution Approach 1:
The patent implements feedback mechanisms where the base station controller receives information about subscriber reception conditions and buffered data sizes, then adjusts power allocation and channel assignment accordingly. This closed-loop feedback enables dynamic optimization of transmission resources based on actual system state, resolving the contradiction between resource utilization efficiency and power expenditure.
Solution Approach 2:
The scheduling procedure is made dynamic by continuously adapting power allocation and channel assignment to changing reception conditions and data buffer states. Instead of static resource allocation, the system dynamically adjusts transmission parameters for each subscriber unit, improving resource utilization while preventing excessive power expenditure on poor reception channels.
2Speed
If transmission rates are increased to improve data delivery speed, then data transmission efficiency improves, but power consumption increases significantly
Solution Approach 1:
The patent applies local quality by assigning different power levels and channel qualities to different subscriber units based on their specific reception conditions. Instead of uniform high-power transmission to all subscribers, the system tailors transmission quality locally to each subscriber's needs, achieving adequate data delivery speeds while minimizing overall power consumption.
Solution Approach 2:
The system changes transmission parameters (power level, channel assignment, modulation scheme) dynamically based on reception conditions and QoS requirements. By adjusting these parameters rather than maintaining fixed high-rate transmission, the system achieves necessary data delivery speeds while controlling power consumption within acceptable limits.
3Reliability
If power is allocated to maintain constant transmission rates, then transmission reliability improves, but resource flexibility decreases and QoS requirements cannot be met
Solution Approach 1:
The patent applies partial action by allocating power and transmission resources selectively based on QoS requirements and current system state. Instead of maintaining constant maximum transmission rates for all subscribers, the system provides adequate transmission reliability only where needed, allowing resource flexibility to accommodate varying QoS requirements while maintaining necessary reliability levels.
Data Source
AI summary
A cellular radio system transmits data from an IP-based network, through a base station controller (BSC) and any Base Station Transceiver (BTS) controlled by the BSC, to a plurality of active subscriber units. Instantaneous data transmission from the BTS to any active subscriber unit is at one of a plurality of given transmission rates and at a defined power level that is a product of a specific power and a multiplier, relative to a maximum total power transmittable by the corresponding BTS. A method for estimating the instantaneous specific power of transmission from the BTS to active subscriber units comprises defining in time a succession of observation windows, observing the data flowing into the BSC and addressed to each of the active subscribers and, for each subscriber, measuring the data flow during each of the observation windows, thus allowing calculation of an estimated specific power for each of the subscribers.