RF Scheduling for VoIP Packet Aggregation
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Solution Overview
Problem
Current wireless telecommunications systems face inefficiencies in RF transport efficiency, particularly with Voice over Internet Protocol (VoIP) services due to small packet sizes and tight delay budgets, which degrade RF efficiency and hinder multi-user diversity gain, even with header compression and technologies like EVDO.
Innovation Solution
A novel RF scheduling scheme that accumulates latency-sensitive and VoIP packets and transmits them within a single time slot, optimizing RF efficiency by introducing controlled latency for multiplexing and minimizing time slot occupancy, thereby enhancing both VoIP and data packet throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDMA scheduling is used for VoIP traffic, then RF efficiency is improved through time slot allocation, but transport packing efficiency deteriorates due to small packet sizes
Solution Approach 1:
The patent combines multiple small VoIP packets into a single aggregated packet that occupies one time slot. This merging approach allows the system to maintain the time slot structure required by TDMA for RF efficiency while increasing the effective payload size to improve transport packing efficiency. The aggregation buffer holds individual VoIP packets temporarily before combining them into a larger transmission unit.
2Quantity of substance
If header compression is applied to VoIP traffic, then transport efficiency is improved, but RF transport efficiency remains poor due to fixed physical framing structure
Solution Approach 1:
The patent performs packet aggregation in advance before transmission, combining multiple compressed VoIP packets into a single time slot allocation. This preliminary aggregation action allows the system to take advantage of header compression benefits while simultaneously improving RF transport efficiency by reducing the number of separate transmissions required, thereby optimizing both efficiency metrics.
3Productivity
If EVDO common time slot transmission is used for multiple access terminals, then RF efficiency is improved, but QoS scheduler performance deteriorates in mixed VoIP and data environment
Solution Approach 1:
The patent segments the scheduling function into separate handling for VoIP traffic and data traffic. VoIP packets are aggregated into dedicated time slots with guaranteed QoS parameters, while data traffic uses the common time slot structure of EVDO. This segmentation allows the system to maintain EVDO's RF efficiency benefits for data while providing specialized QoS scheduling for VoIP traffic, resolving the performance deterioration in mixed environments.
Data Source
AI summary
In one aspect of the instant invention, a method is provided for controlling a communications system in which VoIP traffic and data traffic are both provided. The method comprises receiving voice over internet protocol packets, accumulating a plurality of the voice over internet protocol packets, and transmitting the accumulated plurality of voice over internet protocol packets within a single time slot.