Enhanced Link Adaptation for Wireless Personal Networks
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Solution Overview
Problem
The WiMedia MAC protocol for ultra-wideband wireless personal area networks faces challenges in fulfilling strict quality of service and latency requirements due to fixed transmission rates and dynamic link quality degradation, particularly when objects obstruct the wireless link, and lacks effective adaptation of transmission parameters beyond rate and power.
Innovation Solution
An enhanced link adaptation technique is introduced, utilizing an ELA information element that includes link quality feedback and packet information to dynamically adjust transmission parameters such as rate, power, and packet size, allowing receivers to provide detailed link feedback to transmitters for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed transmission rate is utilized to transfer data over a wireless link, then device complexity is reduced, but quality of service and latency requirements cannot be fulfilled when link conditions change
Solution Approach 1:
The patent implements dynamic link adaptation by enabling the receiver to select optimal transmission parameters (rate, power, packet size) based on current link conditions and forward them to the transmitter. This transforms the static fixed-rate system into a dynamic adaptive system that responds to changing wireless conditions, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent introduces a feedback mechanism where the receiver measures link quality and sends recommendations back to the transmitter through enhanced link feedback information elements. This feedback loop enables the system to adapt transmission parameters based on actual link conditions, achieving quality of service requirements without requiring complex transmitter-side measurements.
2Productivity
If the receiver selects transmission parameters based on link conditions, then transmission efficiency is improved, but the receiver cannot derive exact information about traffic pattern/load and QoS requirements
Solution Approach 1:
The patent enhances the link feedback information element to include not only link quality measurements but also traffic pattern information, load conditions, and QoS requirements. This comprehensive feedback mechanism allows the receiver to provide the transmitter with complete information needed for optimal parameter selection, resolving the information loss problem while maintaining high transmission efficiency.
3Adaptability or versatility
If only link feedback information element is used for link adaptation, then protocol simplicity is maintained, but other transmission parameters such as packet size cannot be adapted
Solution Approach 1:
The patent extends the existing link feedback information element to serve multiple functions: it not only provides link quality measurements for rate adaptation but also enables adaptation of power, packet size, and other transmission parameters. This multi-functional approach achieves comprehensive parameter adaptation without requiring separate complex protocols for each parameter.
4Adaptability or versatility
If moving objects are present in the line-of-sight between devices, then wireless communication flexibility is maintained, but link quality is significantly degraded
Solution Approach 1:
The patent implements dynamic adaptation that continuously monitors link quality and adjusts transmission parameters in response to moving objects obstructing the line-of-sight. When objects block the path, the system dynamically selects lower rates, adjusted power levels, or modified packet sizes to maintain reliable communication, thus preserving both flexibility and reliability in mobile environments.
Data Source
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AI summary
A method (300) for performing link adaptation of wireless links in a wireless network. The method comprises generating a first enhanced link adaptation (ELA) information element (100) by the transmitter (S310); sending the first ELA information element to at least one receiver (S320); upon reception of a second ELA information element at the transmitter, determining optimal transmission parameters for the transmitter, wherein the second ELA information element is generated and sent by the at least one receiver in response to the first ELA information element (S370).