Dynamic PRB Bundling for Excessive Delay Spread
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Solution Overview
Problem
Existing communication systems face challenges in mitigating excessive delay spread (EDS) in radio channels, leading to inter-symbol interference (ISI) and inter-carrier interference (ICI), which result in signal distortion and reduced communication reliability.
Innovation Solution
The solution involves a communication device that dynamically adapts the size of physical resource blocks (PRBs) based on the delay spread of the radio channel. When the delay spread exceeds the cyclic prefix (CP) length, the device transmits symbols in larger PRBs, improving bandwidth efficiency and data rate. Additionally, the device can puncture low-priority symbols, extend the cyclic prefix of high-priority symbols, or add a cyclic postfix to ensure reliable transmission of high-priority symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cyclic prefix length is increased to mitigate ISI and ICI in EDS channels, then communication reliability is improved, but bandwidth efficiency and data rate decrease
Solution Approach 1:
The patent applies dynamics by making the PRB bundling size adjustable rather than fixed. The network device dynamically selects between first PRB bundling (smaller size) and second PRB bundling (larger size) based on channel delay spread conditions. When EDS is detected, the system transitions to the second PRB bundling configuration, enabling adaptive optimization of both reliability and bandwidth efficiency according to actual channel conditions.
Solution Approach 2:
The patent changes the parameter of PRB bundling size from a fixed value to a variable that can be adjusted based on channel conditions. By switching between different PRB bundling configurations (first with smaller size, second with larger size), the system modifies the effective resource allocation parameters to mitigate EDS effects while maintaining optimal bandwidth efficiency.
2Reliability
If the cyclic prefix length is increased to mitigate ISI and ICI, then signal distortion is reduced, but transmission energy consumption increases
Solution Approach 1:
The system dynamically adjusts PRB bundling size based on detected channel conditions. When EDS is present, it switches to the second PRB bundling configuration which allocates resources more effectively, avoiding the need to uniformly increase CP length across all PRBs. This dynamic adaptation reduces unnecessary energy consumption while maintaining signal quality.
Solution Approach 2:
The patent applies local quality by differentiating PRB bundling configurations based on local channel conditions. Instead of uniformly increasing CP length across the entire bandwidth, the system selectively applies different PRB bundling sizes (first or second) based on the specific EDS conditions detected in different frequency regions or time slots, optimizing energy efficiency locally.
3Device complexity
If fixed PRB bundling size is used, then system complexity is reduced, but adaptability to varying delay spread conditions deteriorates
Solution Approach 1:
The patent implements dynamics by introducing adjustable PRB bundling size that can switch between first (smaller) and second (larger) configurations. The network device determines which configuration to use based on detected channel delay spread, enabling the system to adapt to varying EDS conditions while maintaining manageable complexity through predefined configuration options.
Data Source
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AI summary
The invention relates to a first communication device (100) for handling excessive delay spread in a radio channel. The first communication device (100) is configured to transmit at least one first symbol in a first physical resource block bundling in a radio channel to a second communication device (300) and transmit at least one second symbol in a second physical resource block bundling to the second communication device (300) upon determining that a delay spread of the radio channel exceeds a cyclic prefix length of the first symbol, wherein a size of the second physical resource block bundling is larger than a size of the first physical resource block bundling. Thereby, PRB bundling is dynamically adapted for different delay spread conditions on the radio channel and hence bandwidth efficiency and data rate are improved. Furthermore, the disclosure also relates to a second communication device (300), corresponding methods and a computer program.