Dynamic Channel Assignment for Wireless Access Terminals
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel assignments for access terminals based on signal strength, leading to potential overloading and increased delays, especially for delay-sensitive data like VoIP, which affects network capacity and resource utilization.
Innovation Solution
A method and apparatus that dynamically assign frequency channels to access terminals based on their signal-to-noise ratio (SNR), adjusting the number of channels in response to changes in signal strength, thereby optimizing channel allocation according to the 1×EV-DO, 3×EV-DO, and IS856-Rev-B protocols to reduce average delay and conserve resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of channels is increased to support more access terminals, then network capacity is improved, but transmission delay increases for delay-sensitive traffic
Solution Approach 1:
The patent applies local quality by differentiating channel assignment based on the local signal conditions (SNR) of each access terminal. Terminals with poor signal quality receive more channels to ensure adequate throughput, while terminals with good signal quality receive fewer channels. This localized adaptation resolves the contradiction by optimizing resource distribution according to individual terminal needs rather than applying a uniform allocation strategy.
Solution Approach 2:
The patent implements dynamics by making channel assignments adaptive and time-varying based on changing signal conditions. The system continuously monitors SNR and dynamically adjusts the number of channels assigned to each terminal. This dynamic approach allows the network to respond to fluctuating channel conditions, maintaining low delay for delay-sensitive traffic while supporting varying numbers of terminals as conditions change.
2Loss of time
If channels are assigned to maintain low transmission delay, then delay-sensitive traffic quality is improved, but network power consumption and resource utilization increase
Solution Approach 1:
The patent applies parameter changes by using SNR as a key parameter to determine channel assignment. By changing the number of channels based on SNR thresholds and requirements, the system optimizes the balance between delay performance and power consumption. Terminals with high SNR require fewer channels to maintain acceptable delay, reducing their power consumption, while terminals with low SNR receive more channels to achieve the same delay performance.
Solution Approach 2:
The dynamic channel assignment based on real-time SNR measurements allows the system to adapt power consumption to actual channel conditions. When signal conditions are good, terminals consume less power with fewer channels; when conditions deteriorate, the system allocates more channels to maintain delay performance. This dynamic adjustment resolves the contradiction between delay quality and power consumption.
3Device complexity
If uniform channel assignment is used for all access terminals, then device complexity is reduced, but network efficiency and resource utilization deteriorate
Solution Approach 1:
The patent implements local quality by assigning different numbers of channels to different terminals based on their specific signal conditions rather than applying a uniform assignment. The complexity is localized to the channel assignment decision logic, which uses simple SNR-based rules to determine the appropriate number of channels for each terminal. This approach significantly improves network efficiency while keeping the additional complexity manageable through rule-based differentiation.
Data Source
AI summary
In a radio access network, an access terminal is assigned frequency channels for communication between the access terminal and a radio node of a radio access network based on a strength of a signal determined for the access terminal.