PUSCH Repetition RV Selection for Variable Symbol Lengths
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Solution Overview
Problem
Existing methods for repetitive uplink channel transmission in wireless communication systems, particularly in 5G systems, face challenges in optimizing redundancy version (RV) values for PUSCH repetitive transmission type B, leading to reduced reception performance and coverage due to varying numbers of symbols in each transmission.
Innovation Solution
A method and apparatus for determining RV values by comparing the number of symbols configured by the base station with the number of symbols used for repetitive transmissions, ensuring appropriate RV values are assigned for each transmission to maximize the gain from repetitive transmissions and improve uplink reception performance and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for repetitive uplink channel transmission are used, then the transmission can be performed with standard RV values, but the reception performance and coverage are reduced due to varying numbers of symbols in each transmission
Solution Approach 1:
The patent changes the RV value parameter dynamically based on the number of symbols in each transmission. Specifically, when the number of symbols is less than a threshold, the RV value is set to 0; when the number of symbols is greater than or equal to the threshold, the RV value is set to 3. This parameter adaptation resolves the contradiction by making the transmission reliable across varying symbol lengths.
2Ease of manufacture
If standard RV values are used for repetitive transmissions, then the implementation is simple, but the coverage and reception performance deteriorate in varying transmission environments
Solution Approach 1:
The patent introduces a threshold-based parameter change mechanism that maintains implementation simplicity while improving coverage. The base station configures a threshold value, and the terminal automatically adjusts RV values based on comparing the actual symbol count against this threshold. This approach achieves better coverage without complex algorithms, resolving the contradiction between simplicity and reliability.
3Reliability
If RV values are optimized based on symbol count comparison, then reception performance and coverage improve, but the complexity of determining appropriate RV values increases
Solution Approach 1:
The patent uses a simple threshold-based parameter change strategy where RV values are adjusted based on whether the symbol count is above or below a configured threshold. This avoids complex optimization algorithms while still achieving improved reception performance, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The base station performs preliminary action by configuring the threshold value in advance through RRC signaling. This pre-configuration simplifies the terminal's decision-making process during actual transmission, as the terminal only needs to compare the symbol count against the pre-configured threshold rather than performing complex real-time optimization, thereby reducing device complexity while maintaining improved performance.
Data Source
AI summary
An operating method of a terminal in a wireless communication system may include receiving, from a base station, configuration information for repetitive transmissions of uplink data, based on the configuration information, determining a redundancy value (RV) value of the uplink data, and transmitting the uplink data based on the RV value, wherein the determining of the RV value may include determining the RV value by comparing a number of symbols configured by the base station with a number of symbols used for the repetitive transmissions of the uplink data.