PUCCH Sequence Cyclic Shifts for HARQ ACK/NACK Transmission
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting uplink control information, particularly in handling Hybrid Automatic Retransmission Request (HARQ) Acknowledgement (ACK/NACK) and Scheduling Request (SR) using Physical Uplink Control Channel (PUCCH), which can lead to increased complexity and resource utilization.
Innovation Solution
A wireless transmit/receive unit (WTRU) employs specific cyclic shifts of sequences to transmit HARQ ACK/NACK and SR, with one-bit information using two cyclic shifts differing by half the sequence length and two-bit information using four cyclic shifts differing by a quarter of the sequence length, allowing for efficient resource allocation and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PUCCH formats and resources are used to transmit different UCI types, then transmission flexibility is improved, but device complexity and resource overhead increase
Solution Approach 1:
The patent combines SR and HARQ-ACK transmissions by using the same PUCCH resource and sequence modulation approach. Instead of maintaining separate PUCCH resources for SR and HARQ-ACK, the invention modulates both types of information onto the same physical uplink control channel resource through sequence selection and modulation, thereby reducing resource overhead and device complexity while maintaining transmission flexibility
Solution Approach 2:
The patent creates a universal PUCCH transmission mechanism that can handle both SR and HARQ-ACK using the same resource and procedure. The base sequence and cyclic shift selection approach serves multiple functions: it can transmit SR alone, HARQ-ACK alone, or both simultaneously, eliminating the need for separate dedicated resources for each UCI type
2Reliability
If separate PUCCH resources are allocated for SR and HARQ-ACK, then transmission reliability is improved, but resource overhead increases
Solution Approach 1:
The patent merges SR and HARQ-ACK transmissions onto the same PUCCH resource by using sequence modulation. The base sequence is selected and cyclically shifted based on the SR state, and the same modulated sequence carries both SR and HARQ-ACK information, thereby reducing resource overhead while maintaining reliable transmission through proper sequence design and detection mechanisms
Data Source
AI summary
A wireless transmit receive unit (WTRU) may be configured to transmit uplink control information such as Hybrid Automatic Retransmission Request (HARQ) Acknowledgement or Negative Acknowledgement (ACK/NACK) using a sequence. The HARQ ACK/NACK may comprise one bit or two bits of information, and the WTRU may use a cyclic shift of the sequence to transmit the HARQ ACK/NACK. The WTRU may use different cyclic shifts of the sequence to transmit different HARQ ACK/NACK values and the cyclic shifts may be separated from each other in a manner to facilitate the transmissions. The WTRU may be further configured to receive, from a physical downlink control channel (PDCCH), an indication of a resource block for transmitting the HARQ ACK/NACK.