Uplink Power Control for PUCCH in Multi-Antenna Wireless Systems
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Solution Overview
Problem
Conventional LTE systems do not support multiple antenna transmission in the uplink, which limits the effective control and power management of physical uplink control channels (PUCCH), affecting link performance and data rate.
Innovation Solution
A method and apparatus for performing Hybrid Automatic Repeat Request (HARQ) using multiple resources and antennas, allowing dynamic switching between multiple-antenna and single-antenna transmission modes to optimize transmit power control for PUCCH in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LTE single-antenna transmission is used, then the system is simple to implement, but link performance and data rate are limited
Solution Approach 1:
The patent implements dynamic switching between single-antenna and multiple-antenna transmission modes based on channel conditions and traffic requirements. The system can adaptively select transmit modes (single-antenna port, transmit diversity, spatial multiplexing) to optimize link performance while maintaining implementation simplicity when single-antenna operation is sufficient
Solution Approach 2:
The patent designs a universal uplink transmission framework that supports both single-antenna and multiple-antenna operations within the same system. The same physical channels (PUCCH, PUSCH, SRS) and power control mechanisms are used across different antenna configurations, allowing the system to function effectively in both simple and complex scenarios without requiring separate systems
2Productivity
If multiple antenna transmission is implemented in uplink, then data rate and capacity increase, but power control complexity increases
Solution Approach 1:
The patent segments the power control mechanism into distinct components: base power calculation for each antenna port, transmit diversity power adjustments, and spatial multiplexing power allocations. This segmentation allows independent optimization of each component while maintaining overall system efficiency and reducing the complexity of managing multiple antennas simultaneously
Solution Approach 2:
The patent introduces transmit mode-dependent power offsets as adjustable parameters that can be dynamically modified based on channel conditions, traffic type, and antenna configuration. These parameter changes enable flexible power distribution across multiple antennas without requiring complete redesign of the power control algorithm
3Reliability
If multiple PUCCH resources are allocated for HARQ, then reliability improves, but resource overhead increases
Solution Approach 1:
The patent combines multiple PUCCH resources into a unified HARQ feedback mechanism where multiple antenna ports share common resource pools. Instead of allocating completely separate resources for each antenna, the system merges resource usage through resource block sharing and orthogonal code multiplexing, reducing overall resource overhead while maintaining the reliability benefits of multiple PUCCH resources
Data Source
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AI summary
A method and apparatus for transmitting a physical uplink control channel, PUCCH, in a wireless communication system is provided. A user equipment (UE) having a first antenna port and a second antenna port determines the number of antenna ports to be used for transmitting the PUCCH, selects a transmit power offset value among a pre-stored integer value and higher layer signaled integer values based on the number of the antenna ports used for transmitting the PUCCH, determines an uplink transmit power of the PUCCH based on the transmit power offset value, and transmits the PUCCH at the determined uplink transmit power.