Bandwidth Allocation for Wireless Voice Traffic
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Solution Overview
Problem
Wireless broadband access networks like WiMax face congestion issues due to shared bandwidth, leading to performance degradation, as existing methods like the Erlang B model assume uniform bandwidth usage for voice traffic, resulting in inefficient allocation and potential call blocking, especially with varying codec technologies.
Innovation Solution
A method for traffic engineering that determines the number of subscriber stations a base station can support based on performance objectives, using a combination of the Equivalent Bandwidth model, Markov Modulated Poisson Process, and Erlang B model to allocate bandwidth dynamically, prioritizing voice traffic and accounting for different codec technologies, while implementing admission control and fair blocking mechanisms to maintain service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Erlang B model is used to determine bandwidth requirements, then the calculation is simplified, but the allocation becomes inefficient due to uniform bandwidth assumption
Solution Approach 1:
The patent applies local quality by transitioning from uniform bandwidth allocation to differentiated bandwidth allocation based on codec type. Each codec (e.g., G.711, G.729, iLBC) is assigned specific bandwidth requirements that reflect its actual characteristics. This allows the system to maintain calculation simplicity while improving allocation efficiency by treating different voice codecs with their respective bandwidth needs rather than applying a blanket uniform allocation.
2Quantity of substance
If more subscribers are supported on shared bandwidth, then network capacity increases, but congestion occurs and performance objectives are not met
Solution Approach 1:
The patent implements preliminary action by performing admission control before subscribers are connected to the network. The system calculates the number of concurrent calls that can be supported based on available bandwidth and codec-specific requirements in advance. This pre-calculation allows the network to accept only those subscribers that can be accommodated without violating performance objectives, thereby increasing overall network capacity while maintaining reliability.
3Reliability
If voice traffic is prioritized over data traffic, then voice quality is maintained, but data traffic may experience increased delay
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting bandwidth allocation based on traffic type and codec characteristics. Voice traffic receives guaranteed bandwidth allocation based on its specific codec requirements, ensuring quality of service. Data traffic is allocated remaining bandwidth after voice requirements are met. This dynamic parameter adjustment allows the system to maintain voice quality while minimizing data delay through efficient residual bandwidth utilization.
Data Source
AI summary
A method and apparatus for performing traffic engineering, e.g., allocating bandwidth, on a wireless access network are disclosed. For example, the method determines a number of subscriber stations (SSs) that a Base Station (BS) is capable of supporting in accordance with at least one performance objective for voice traffic, wherein the at least one performance objective for voice traffic comprises a type of codec. The method then allocates bandwidth by the base station in accordance with the number of subscriber stations that the base station is capable of supporting.