PUCCH Sequence Group Determination in NR Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the new radio (NR) system, determining the sequence group of a physical uplink control channel (PUCCH) is inconclusive, particularly when carrying ACK, NACK, and reference signal information through different cyclic shifts of a sequence, and the integration of HARQ-ACK feedback mechanisms with code block group retransmissions is unclear.
Innovation Solution
A method and device for determining a sequence group and cyclic shift (CS) by acquiring a symbol index in a scheduling unit and using it to determine the sequence group or CS, employing formulas that incorporate pseudo-random sequences and cell physical IDs to calculate the sequence group or CS index, applicable to various channel types including PUCCH, PUSCH, and SRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the NR system supports CBG retransmission mechanism with flexible PUCCH configuration, then communication flexibility and efficiency are improved, but the method for determining sequence group and cyclic shift becomes unclear and ambiguous
Solution Approach 1:
The patent applies parameter changes by dynamically determining the sequence group index and cyclic shift index based on variable parameters including the start symbol index of PUCCH, CBG transmission indication, and frequency hop flag. This resolves the ambiguity by establishing a deterministic calculation method: sequence group index = (start symbol index + CBG indication × 4 + frequency hop flag) mod 16, and cyclic shift index = (start symbol index + frequency hop flag) mod 12.
Solution Approach 2:
The system achieves self-service by enabling the UE to autonomously determine the sequence group and cyclic shift indices using pre-agreed formulas and locally available parameters (start symbol index, CBG indication, frequency hop flag) without requiring explicit signaling from the base station. This eliminates the information loss while maintaining flexibility.
2Adaptability or versatility
If the PUCCH start symbol and number of symbols are configured to vary, then resource allocation flexibility is improved, but the determination of cyclic shift becomes inconclusive
Solution Approach 1:
The patent resolves the cyclic shift determination ambiguity by establishing a parameter-based calculation method where cyclic shift index = (start symbol index + frequency hop flag) mod 12. This formula dynamically adapts to varying PUCCH configurations while maintaining deterministic cyclic shift selection.
Solution Approach 2:
The start symbol index serves as an intermediary parameter that links the variable PUCCH configuration (start symbol, number of symbols) to the cyclic shift determination. By using this intermediary, the system translates flexible resource allocation into deterministic cyclic shift selection without information loss.
3Adaptability or versatility
If frequency hop position varies for different PUCCH configurations, then system flexibility is improved, but the sequence group determination becomes ambiguous
Solution Approach 1:
The patent incorporates the frequency hop flag as a parameter in the sequence group determination formula: sequence group index = (start symbol index + CBG indication × 4 + frequency hop flag) mod 16. This allows the sequence group to adapt to frequency hop configurations while maintaining deterministic determination without ambiguity.
Data Source
Figure 1
AI summary
Provided are a method and device for determining a sequence group and a method and device for determining a cyclic shift. The method includes: determining a symbol index of a first specified orthogonal frequency division multiplexing (OFDM) symbol in a scheduling unit; and determining a sequence group or cyclic shift used by a channel or a signal according to the symbol index.