Dynamic Active Set Management in CDMA Mobile Stations
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Solution Overview
Problem
Current CDMA-based telecommunications systems face limitations in signal processing due to fixed active set sizes, leading to interference from weak signals and inefficient resource utilization, as they lack flexibility in adjusting the number of base stations transmitting to mobile stations, which affects reception quality and user capacity.
Innovation Solution
A method and apparatus that allow mobile stations to dynamically adjust the number of active base stations by selecting and deselecting them based on signal strength measurements, enabling variable active sets that optimize signal processing and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed active set size is used in CDMA-based telecommunications systems, then the system structure is simple and easy to manage, but interference from weak signals increases and resource utilization becomes inefficient
Solution Approach 1:
The patent implements dynamic active set management where the mobile station can adjust the number of active base stations based on signal strength measurements. The active set size is no longer fixed but adapts dynamically to changing channel conditions, allowing the system to optimize between simplicity and performance by selecting an appropriate active set size from multiple options.
Solution Approach 2:
The invention changes the parameter of active set size from a fixed value to a variable that can be adjusted based on signal conditions. The mobile station measures signal strengths from multiple base stations and selects an optimal number of active base stations, thereby changing the system parameter to balance complexity and interference levels.
2Reliability
If the number of active base stations is increased to improve reception quality, then signal processing performance improves, but resource utilization efficiency decreases
Solution Approach 1:
The system dynamically adjusts the number of active base stations based on real-time signal strength measurements. When reception quality is poor, more base stations are activated to improve reliability. When conditions improve, the active set size is reduced to optimize resource utilization, creating a dynamic balance between reliability and productivity.
Solution Approach 2:
The active set size parameter is adjusted based on signal conditions. The mobile station measures pilot signals from multiple base stations and selects an optimal number to activate, changing the system parameter to achieve the desired balance between reception quality and resource efficiency under different operating conditions.
3Object-generated harmful factors
If the active set size is dynamically adjusted based on signal strength, then interference reduction and resource utilization improve, but the complexity of active set management increases
Solution Approach 1:
The mobile station autonomously performs signal strength measurements and determines the optimal active set size without requiring complex centralized control. The system uses self-service mechanisms where the mobile station independently manages its active set based on local measurements, reducing the need for complex network-side management while still achieving interference reduction.
Solution Approach 2:
The system implements feedback mechanisms where the mobile station continuously measures signal strengths from active and candidate base stations. This feedback information is used to dynamically adjust the active set size, creating a closed-loop control system that automatically optimizes performance while managing complexity through measured response to signal conditions.
Data Source
AI summary
A first communication device wirelessly coupled to a second communication device. The first communication device includes a first receiver, a message processor, and a first transmitter. The first receiver is configured to receive first signals corresponding to a first number of communication devices, where the second communication device is one of the communication devices, and is also configured to measure first strengths of the first signals. The message processor is configured to determine that a second number of the communication devices can be processed by the first communication device according to the first strengths measured. The first transmitter is configured to transmit one or more first messages to the second communication device indicating the second number.