LTE Uplink PUCCH Configuration for Flexible Bandwidth Allocation
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Solution Overview
Problem
Current LTE Rel. 8 SC-FDMA systems face challenges in supporting transmission bandwidths larger than 20 MHz due to continuous spectrum usage requirements, leading to inefficient bandwidth allocation and reduced spectral efficiency, especially in LTE-A deployments where non-contiguous spectrum allocation is necessary.
Innovation Solution
The method involves over-provisioning periodic channel quality indicator resources and allocating them in a way that reduces effective system bandwidth and accounts for out-of-band emissions, allowing for flexible spectrum usage and adjusted bandwidth configurations, including the use of PUCCH format 2/2a/2b resources to leave spectrum edges unused.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous spectrum usage is required for SC-FDMA transmission, then uplink orthogonality and frequency-domain equalization are achieved, but bandwidth allocation efficiency decreases and spectral efficiency is reduced
Solution Approach 1:
The patent segments the uplink control channel resources by introducing separate PUCCH resources for different UE groups (first group with first uplink bandwidth, second group with second uplink bandwidth). This segmentation allows different bandwidth allocations for different UE groups, improving overall bandwidth allocation efficiency while maintaining SC-FDMA orthogonality within each group.
Solution Approach 2:
The patent implements dynamic bandwidth allocation where the network can configure different uplink bandwidths (first uplink bandwidth or second uplink bandwidth) for different UE groups based on system conditions. This dynamic adjustment enables efficient spectrum usage while maintaining the continuous spectrum requirement for SC-FDMA operation.
2Reliability
If PUCCH is configured for all UEs with maximum bandwidth, then control channel coverage is ensured, but resource waste occurs in UEs with smaller bandwidth requirements
Solution Approach 1:
The patent applies local quality by configuring different PUCCH bandwidth resources for different UE groups based on their specific bandwidth requirements. The first UE group uses first PUCCH resources with first uplink bandwidth, while the second UE group uses second PUCCH resources with second uplink bandwidth. This localized resource configuration ensures adequate control channel coverage for each UE while avoiding resource waste.
Solution Approach 2:
The patent changes the bandwidth parameter for PUCCH resources based on UE group classification. By configuring different uplink bandwidth parameters (first uplink bandwidth vs. second uplink bandwidth) for different UE groups, the system optimizes radio resource usage while maintaining sufficient control channel coverage for all UEs.
3Adaptability or versatility
If LTE Rel. 8 SC-FDMA system uses standardized bandwidth configurations, then system compatibility is maintained, but flexibility in spectrum allocation is reduced
Solution Approach 1:
The patent implements multi-functionality by creating a universal PUCCH configuration mechanism that can serve multiple UE groups with different bandwidth requirements. The system maintains compatibility with LTE Rel. 8 SC-FDMA while adding the capability to configure different uplink bandwidths for different UE groups, achieving both system compatibility and spectrum allocation flexibility.
Data Source
AI summary
In accordance with an example embodiment of the present invention, there is at least a method, apparatus, and computer program product to perform an over-provisioning of a radio resource including a periodic channel quality indicator resource in a predetermined way, and an allocating of the radio resource in such a manner that at least one of an effective system bandwidth is reduced and out-of-band emissions related to the allocated radio resource are taken into account.