Bandwidth Part Switching Contention Window Determination
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Solution Overview
Problem
Existing technologies face challenges in operating channel access in unlicensed bands efficiently, particularly in multicarrier communication systems.
Innovation Solution
The implementation of specific physical layer modulation and transmission mechanisms, such as Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Time Division Multiple Access (TDMA), along with dynamic modulation and coding scheme adjustments based on transmission requirements and radio conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel access is implemented in unlicensed bands using conventional methods, then basic communication functionality is achieved, but efficiency and performance are insufficient due to lack of adaptation to varying radio conditions
Solution Approach 1:
The patent implements dynamic modulation and coding scheme adjustments based on transmission requirements and radio conditions. The system continuously monitors channel state information and adapts modulation order, coding rate, and transmission parameters in real-time to optimize channel access efficiency under varying radio conditions in unlicensed bands.
Solution Approach 2:
The patent changes multiple transmission parameters dynamically including modulation order, coding rate, resource allocation, and power settings based on measured radio conditions. These parameter adjustments enable the system to adapt to varying channel quality, interference levels, and traffic requirements, thereby improving overall channel access efficiency.
2Productivity
If specific physical layer modulation and transmission mechanisms are implemented, then channel access efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the transmission mechanism into distinct modular components including separate modulation modules, coding modules, and resource allocation modules. Each module operates independently with well-defined interfaces, allowing for easier implementation, testing, and optimization of individual functions while maintaining overall system efficiency.
3Productivity
If dynamic modulation and coding scheme adjustments are made based on transmission requirements, then performance is enhanced, but processing overhead and complexity increase
Solution Approach 1:
The patent pre-calculates and stores modulation and coding schemes for various channel conditions in lookup tables. During actual transmission, the system quickly retrieves appropriate parameters based on current channel state information rather than performing complex real-time calculations, thereby reducing processing overhead and latency while maintaining optimal performance.
Data Source
AI summary
A base station transmits to a wireless device configuration parameters of a first bandwidth part (BWP) and a second BWP of an unlicensed cell. The base station determines a first contention window for a first listen before talk (LBT) procedure for the first BWP. The determination of the first contention window being based on hybrid automatic repeat request (HARQ) feedback of one or more transmissions via a first channel of the first BWP. Based on switching from the first BWP to the second BWP, as the active BWP, the base station determines a second contention window for the LBT procedure of a second channel of the second BWP. The second coantention window being the minimum contention window of a plurality of contention windows. Finally, the base station receives, via the second BWP, a transport block based on the second LBT procedure using the second contention window indicating a clear channel.