Semi-Persistent Scheduling for VoIP Traffic Spurts

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Solution Overview

Problem

Wireless communication systems face inefficiencies in resource assignment, leading to high overhead and reduced system capacity due to the need for frequent requests and grants for uplink and downlink resources, especially in scenarios like VoIP where data transmission occurs in spurts.

Innovation Solution

Implementing semi-persistent and non-persistent resource assignments, where resources are allocated for a predetermined time period or specific transmission, reducing the need for continuous requests and grants by anticipating data activity and releasing resources when not in use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional resource assignment is used with frequent requests and grants, then resource allocation flexibility is improved, but control channel overhead increases and system capacity decreases

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidcontrol channel overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by anticipating data activity and proactively assigning resources before actual transmission occurs. The base station predicts upcoming data bursts and pre-allocates resources, eliminating the need for frequent real-time requests and grants. This reduces control channel overhead while maintaining allocation flexibility through predictive scheduling based on traffic patterns.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by making resource assignment adaptive and flexible rather than static. The semi-persistent assignment allows dynamic adjustment of resource allocation based on actual data transmission needs, enabling the system to adapt to varying traffic conditions while reducing overhead through automated persistence of assignments.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If semi-persistent resource assignment is used, then control channel overhead is reduced, but resource allocation precision for short bursts may be compromised

Engineering Contradiction:

Improvecontrol channel overheadVSAvoidresource allocation precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The system performs preliminary resource assignment based on predicted data patterns, which works effectively for sustained traffic bursts. The preliminary action allows the system to allocate resources in advance, reducing overhead while maintaining precision for expected transmission durations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent incorporates feedback mechanisms where the base station monitors actual data transmission and adjusts assignments accordingly. This feedback loop ensures that semi-persistent assignments remain precise by adapting to actual usage patterns, correcting any initial predictions, and optimizing resource allocation for both sustained and short bursts.

Inventive Principle:

Principle #23Feedback

3Productivity

If resources are allocated for anticipated data spurts, then resource utilization is improved, but potential data transmission delays may increase

Engineering Contradiction:

Improveresource utilizationVSAvoiddata transmission delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs preliminary resource assignment based on predicted data patterns, which improves resource utilization by preventing idle time. However, this may introduce delays if predictions are inaccurate or if assignment takes time to process. The patent balances this by using intelligent prediction algorithms that consider historical data patterns while maintaining quick response capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic adjustment where resource assignments can be modified or accelerated based on actual transmission needs. If data arrives sooner than predicted, the system can dynamically adjust the timing, ensuring low latency while maintaining the benefits of predictive resource allocation for improved utilization.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8848618B2Semi-persistent scheduling for traffic spurts in wireless communication

Publication Date: 2014.09.30 QUALCOMM INC

AI summary

Techniques for efficiently assigning resources for spurts of traffic in a wireless communication system are described. The system may support semi-persistent and non-persistent resource assignments. A semi-persistent resource assignment is valid for as long as more data is sent within a predetermined time period of last sent data and expires if no data is sent within the predetermined time period. A non-persistent resource assignment is valid for a predetermined duration or a specific transmission. A semi-persistent resource assignment may be granted for an expected spurt of data to send via the communication link. For Voice-over-Internet Protocol (VoIP), a semi-persistent resource assignment may be granted for a voice frame in anticipation of a spurt of voice activity, and a non-persistent resource assignment may be granted for a silence descriptor (SID) frame during a period of silence.