Dynamic Channel Access in Unlicensed Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting diverse devices and services, such as Ultra Reliable Low Latency Communications (URLLC) and Enhanced Mobile Broadband (eMBB), due to interference in unlicensed frequency bands and varying data traffic profiles, which affects channel access and latency requirements.
Innovation Solution
The implementation of dynamic and semi-static channel access techniques, including Listen Before Talk (LBT) and Fixed Frame Period (FFP) configurations, to manage channel access in unlicensed bands, ensuring reliable and low-latency communications by optimizing contention window sizes and frame structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dynamic channel access techniques like LBT are implemented in unlicensed bands, then interference management is improved, but channel access latency increases
Solution Approach 1:
The patent implements dynamic channel access techniques where the Listen Before Talk (LBT) procedure adjusts contention window sizes and frame structures based on channel conditions. The system dynamically modifies access parameters to balance interference management with latency requirements, allowing flexible adaptation to varying traffic profiles and channel states in unlicensed bands.
Solution Approach 2:
The patent changes key parameters such as contention window sizes, frame structures, and LBT thresholds to optimize channel access performance. By adjusting these parameters dynamically based on channel occupancy and interference levels, the system achieves improved interference management while controlling access latency for different service types.
2Productivity
If semi-static channel access configurations are used, then channel access efficiency is improved, but adaptability to varying traffic profiles deteriorates
Solution Approach 1:
The patent creates a multi-functional channel access system that supports both dynamic and semi-static configurations within the same framework. The system can operate in different modes depending on traffic requirements, allowing it to serve multiple service types (eMBB, URLLC, mMTC) with varying traffic profiles while maintaining efficient channel access through standardized procedures.
Solution Approach 2:
The patent implements periodic frame structures with configured grant opportunities that allow semi-static channel access. By establishing periodic transmission opportunities with predetermined parameters, the system achieves efficient channel access for periodic traffic patterns while maintaining the ability to adapt to different traffic profiles through configuration changes.
3Reliability
If optimized contention window sizes are used, then channel access reliability is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary configuration of contention window sizes and LBT parameters through network signaling before actual channel access. By pre-configuring these parameters based on network knowledge and traffic requirements, the system achieves reliable channel access while reducing the computational complexity at the device level, as devices simply follow pre-determined configurations.
Data Source
AI summary
A method for communicating in a mobile telecommunications network, the method comprising transmitting, by a first node and in a first transmission portion of a first frame, a grant message to a second node, the grant message scheduling a first transmission, wherein the grant message indicates that the first transmission will be transmitted in a later transmission portion of the first frames; performing, by the first network node, a first contention-based access procedure in respect of the later transmission portion; if the first contention-based access procedure is successful, the first node providing an indication that the later transmission portion was successfully acquired; monitoring, by the second node and based on the received grant, the indication; and determining, by the second node and based on whether the indication was detected, whether the first node successfully acquired the later transmission portion.