PUCCH Cyclic Shift Parameter Adjustment for NACK Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in enhancing the robustness and efficiency of HARQ feedback in multicast and broadcast transmissions, particularly in diverse application scenarios, where existing methods fail to optimize NACK feedback information transmission effectively.
Innovation Solution
The proposed method involves using cyclic shifts and frequency hopping to generate and transmit PUCCH signals, where the target parameter is determined based on the position of multicarrier symbols, and pseudo-random sequences are used to enhance cyclic shifts, allowing for diverse cyclic shifts and improved resource utilization in NACK feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is supported in multicast/broadcast transmission, then robustness of transmission is improved, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the target parameter (cyclic shift value) based on the time-domain position of multicarrier symbols. This allows the system to optimize NACK feedback transmission by selecting appropriate cyclic shift values from candidate parameters, thereby improving robustness without requiring complex additional hardware structures.
2Reliability
If cyclic shifts are used to generate diverse sequences, then diversity gains are improved, but computational complexity increases
Solution Approach 1:
The patent uses parameter changes by determining the target parameter (cyclic shift value) based on the time-domain position of multicarrier symbols. This approach generates diverse sequences through parameter variation rather than complex computational operations, achieving diversity gains while keeping computational complexity manageable.
3Reliability
If multiple candidate parameters are used for cyclic shift determination, then NACK feedback transmission robustness is improved, but resource overhead increases
Solution Approach 1:
The patent efficiently manages resource overhead by selecting the target parameter from a predefined set of candidate parameters based on time-domain position. This approach provides multiple options for robust NACK feedback transmission without requiring additional physical resources, as the candidate parameters are determined through mathematical relationships rather than additional signaling.
Data Source
AI summary
The present application discloses a method and a device in a node for wireless communications. A node receives a first PDCCH; and transmits a first PUCCH, the first PUCCH occupying X1 multicarrier symbols in time domain; a first basic sequence generates the first PUCCH, and the first basic sequence generates X2 sequences; a target multicarrier symbol is one of the X1 multicarrier symbols, and a target RE set comprises multiple REs, any RE comprised by the target RE set occupying the target multicarrier symbol in time domain; a target sequence is one of the X2 sequences, and a target parameter is used to determine a cyclic shift of the target sequence, the target sequence generating a complex-valued symbol mapped onto the target RE set; the target parameter is one of X3 candidate parameters. The present application enhances the HARQ feedback transmission performance.