PUCCH Cyclic Shift Multiplexing for HARQ-ACK and Scheduling Requests
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink control channels, particularly in simultaneously transmitting HARQ-ACK information and uplink control information, and allocating resources for uplink control channels in cellular wireless communication systems.
Innovation Solution
A User Equipment (UE) in a wireless communication system determines cyclic shift values for a physical uplink control channel (PUCCH) based on HARQ-ACK information and request information, using a sequence generated by cyclic-shifting a base sequence to transmit request and HARQ-ACK information simultaneously, with different cyclic shift values for positive and negative scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resources are allocated for HARQ-ACK information and uplink control information, then resource allocation is simple and reliable, but resource efficiency decreases and transmission overhead increases
Solution Approach 1:
The patent combines HARQ-ACK information and uplink control information into a single PUCCH resource for simultaneous transmission. The base sequence is cyclically shifted to generate different sequences for multiplexing both information types, eliminating the need for separate resources and improving resource efficiency while maintaining transmission reliability through unified resource allocation and detection.
2Measurement precision
If cyclic shift values are determined separately for HARQ-ACK and request information, then detection accuracy is high, but device complexity increases
Solution Approach 1:
The patent determines cyclic shift values by changing parameters of a base sequence through cyclic shifting. The cyclic shift value is derived from the sum of HARQ-ACK information bits and request information bits, allowing different sequences to represent different information combinations. This parameter-based approach maintains high detection accuracy while reducing device complexity compared to separate determination methods.
Data Source
AI summary
A UE in a wireless communication system is disclosed. The UE includes a communication module and a processor for controlling the communication module. The processor determines a first cyclic shift (CS) value based on hybrid automatic repeat request acknowledgment (HARQ-ACK) information representing a response to a downlink channel having been received from a base station, determines a CS offset based on request information representing a request to be transmitted from the UE to the base station, determines a second CS value representing a degree of cyclic-shifting a base sequence to be used in a physical uplink control channel (PUCCH) based on the first CS value and the CS offset, and transmits the PUCCH for simultaneous transmission of the request information and the HARQ-ACK information using a sequence generated by cyclic-shifting the base sequence based on the second CS value.