Dynamic PUCCH Resource Allocation for LTE Uplink Control
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Solution Overview
Problem
Current PUCCH resource allocation in 3GPP-LTE networks is semi-static, leading to inefficient resource utilization, especially when load is low, and fixed modulation and coding schemes do not adapt to varying channel conditions, limiting multiplexing capacity even in good channel conditions.
Innovation Solution
Dynamic PUCCH resource allocation with explicit PRB indication in downlink grants, adaptive modulation and coding schemes based on channel conditions, and improved A/N feedback protection using channel coding and orthogonal cover codes, allowing flexible multiplexing of ACK/NACK bits from multiple UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-static PUCCH resource allocation is used, then resource assignment is simple and stable, but resource utilization efficiency deteriorates when load is low
Solution Approach 1:
The patent implements dynamic PUCCH resource allocation where the network device can flexibly adjust the number and location of PUCCH resources based on real-time uplink control information requirements. This allows the system to adapt resource allocation dynamically rather than using fixed semi-static allocation, thereby improving resource utilization efficiency when load varies.
Solution Approach 2:
The patent changes the parameters of PUCCH resource allocation by introducing dynamic configuration of resource blocks and cyclic shifts based on traffic load and channel conditions. This enables the system to optimize resource utilization by adjusting allocation parameters according to actual network conditions rather than maintaining fixed parameters.
2Adaptability or versatility
If fixed modulation and coding schemes are used for PUCCH, then implementation is simple, but adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent introduces dynamic modulation and coding schemes for PUCCH transmissions, allowing the system to adapt the modulation order and coding rate based on real-time channel quality measurements. This enables the system to optimize transmission reliability and spectral efficiency by adjusting MCS parameters dynamically according to channel conditions.
Solution Approach 2:
The patent implements feedback mechanisms where channel quality indicators are measured and used to adjust modulation and coding schemes for PUCCH. This closed-loop approach allows the system to adapt to varying channel conditions by using feedback information to optimize transmission parameters.
3Productivity
If semi-static PUCCH resource allocation is used, then multiplexing capacity is fixed, but resource flexibility deteriorates when all UEs experience good channel conditions
Solution Approach 1:
The patent implements dynamic multiplexing capacity adjustment by allowing the network to flexibly configure the number of PUCCH resources and their allocation among multiple UEs based on actual traffic load and channel conditions. This enables the system to maximize multiplexing capacity when conditions permit while maintaining flexibility to adjust according to varying network states.
Data Source
AI summary
A radio access network element includes a transceiver and a processor. The transceiver is configured to communicate with at least a first user equipment. The processor is operatively coupled to the transceiver, and the processor is configured to allocate first wireless resources for transmission of first control information by the first user equipment on an uplink control channel during at least a first subframe among a plurality of subframes of a radio frame. The first wireless resources are assigned a format independent of wireless resources allocated for transmission during others of the plurality of subframes of the radio frame.