Link Adaptation for 5G PUCCH Coverage Enhancements
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Solution Overview
Problem
Current 5G communication systems face challenges in adjusting the number of repetitions for physical uplink control channel (PUCCH) transmissions, particularly in mmWave bands, which affects the reliability and latency of different service/priority types, leading to inefficiencies in link adaptation and prioritization mechanisms.
Innovation Solution
A method is introduced where user equipment (UE) generates and transmits channel state information (CSI) reports using channel state information reference signals (CSI-RS), allowing for adjustable repetitions of PUCCH transmissions based on received CSI-RS, enabling better link adaptation and prioritization for different service types by distinguishing between different CSI reports and adapting transmission power accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of repetitions for PUCCH transmission is increased to improve reliability, then the reliability of control information transmission is improved, but the transmission time and latency increase
Solution Approach 1:
The patent applies dynamics by making the number of repetitions configurable and adaptable rather than fixed. The system can dynamically adjust the number of PUCCH repetitions based on channel conditions, service type, and reliability requirements, allowing optimization between reliability and latency for different scenarios
Solution Approach 2:
The patent changes the parameter of repetition count from a static value to a variable that can be adjusted based on different service types and channel conditions. This parameter change enables the system to achieve higher reliability when needed while maintaining lower latency for time-sensitive services
2Adaptability or versatility
If different service types are supported with different reliability requirements, then the adaptability of the system is improved, but the device complexity increases
Solution Approach 1:
The patent segments the link adaptation mechanism by introducing separate handling procedures for different service types (e.g., URLLC, eMBB, mMTC). Each service type can have its own repetition configuration and priority settings, allowing differentiated reliability treatment without requiring a completely complex unified system
Solution Approach 2:
The system dynamically adapts the number of repetitions and transmission parameters based on the detected service type and priority level. This dynamic adaptation enables the system to handle diverse service requirements flexibly, adjusting complexity only when needed while maintaining simplicity for standard cases
3Productivity
If transmission power is adjusted for different CSI reports, then the efficiency of link adaptation is improved, but the difficulty of detecting and measuring channel conditions increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports channel state information (CSI) including CQI indices to the base station. This feedback enables the base station to adjust transmission power and repetition counts based on actual channel conditions, improving link adaptation efficiency while using standardized measurement procedures
Solution Approach 2:
The system replaces complex real-time power adjustment mechanisms with a more manageable approach using discrete CQI indices and pre-configured power settings. Instead of continuously adjusting power based on complex measurements, the system uses quantized channel quality indicators to select from predefined transmission parameters
Data Source
AI summary
A methods and apparatuses for providing and configuring channel state information (CSI) reports. A method of operating a user equipment includes receiving a channel state information reference signal (CSI-RS) and generating, based on the CSI-RS reception, a first CSI report and a second CSI report. The first CSI report includes a first channel quality indicator (CQI) index from a first set of CQI indexes and the second CSI report includes a second CQI index from a second set of CQI indexes. The method further includes transmitting the first CSI report in a first channel and the second CSI report in a second channel.