Simultaneous HARQ-ACK and SR Transmission via Cyclic Shift
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in the simultaneous transmission of HARQ-ACK and SR on the New Radio (NR) physical uplink control channel (PUCCH), leading to potential collisions and inefficiencies in resource allocation.
Innovation Solution
The implementation of cyclic shift techniques on sequences of symbols carrying UCI bits allows for simultaneous HARQ-ACK and SR transmission on the PUCCH, optimizing resource usage and avoiding collisions by employing specific cyclic shift patterns for different configurations of HARQ-ACK and SR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resources are allocated for HARQ-ACK and SR transmissions, then collision avoidance is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent combines HARQ-ACK and SR transmissions into a single PUCCH resource by multiplexing them on the same time-frequency resources. Different cyclic shifts of the base sequence are used to distinguish between HARQ-ACK and SR signals, allowing both transmissions to occur simultaneously without requiring separate dedicated resources, thus improving resource allocation efficiency while maintaining collision avoidance
Solution Approach 2:
The PUCCH resource is designed to serve multiple functions by carrying both HARQ-ACK and SR information. The same physical uplink control channel resource can simultaneously transmit acknowledgment/negative acknowledgment signals and scheduling requests through different cyclic shift variations, making the resource multi-functional and eliminating the need for separate dedicated resources for each signal type
2Adaptability or versatility
If cyclic shift techniques are applied to sequences carrying UCI bits, then simultaneous transmission capability is improved, but signal detection complexity deteriorates
Solution Approach 1:
The patent applies different cyclic shift values to different parts of the transmission (HARQ-ACK versus SR) within the same PUCCH resource. Each signal type is assigned a specific cyclic shift pattern, creating local differentiation in the signal structure. This allows the receiver to detect and separate the signals by correlating with the respective cyclic shift patterns, managing detection complexity through localized signal characteristics rather than global complexity
Data Source
AI summary
A user equipment (UE) is described. The UE includes transmitting circuitry configured to transmit hybrid automatic repeat request acknowledgment/negative acknowledgement (HARQ-ACK) and scheduling request (SR) on a physical uplink control channel (PUCCH) scheduled for the HARQ-ACK transmission. The HARQ-ACK and the SR are transmitted on the PUCCH by applying a cyclic shift on sequences of symbols carrying uplink control information (UCI) bits.