Terminal PUCCH Mode Selection for Concurrent SR and HARQ-ACK
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Solution Overview
Problem
The existing techniques for transmitting Scheduling Request (SR) in 1-symbol Physical Uplink Control Channel (PUCCH) in 5G NR have not been fully examined, leading to potential latency issues when SR and HARQ-ACK transmissions occur simultaneously.
Innovation Solution
A method for simultaneously transmitting SR and HARQ-ACK on 1-symbol PUCCH by allocating dedicated resources for each signal and using blind detection to determine the transmission resource, thereby enabling simultaneous transmission without increasing Peak-to-Average Power Ratio (PAPR) in certain channel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If SR and HARQ-ACK are transmitted simultaneously on 1-symbol PUCCH using existing techniques, then transmission latency is reduced, but the PAPR increases significantly
Solution Approach 1:
The patent divides the PUCCH resource into two separate resource blocks: a first resource block for transmitting SR and a second resource block for transmitting HARQ-ACK. This segmentation allows simultaneous transmission of both signals without overlapping, thereby maintaining low latency while preventing PAPR increase that would occur if both signals were transmitted on the same resource.
Solution Approach 2:
The patent transitions from transmitting both SR and HARQ-ACK on a single PUCCH resource (one-dimensional approach) to using separate resource blocks in the frequency domain (two-dimensional approach). This dimensional expansion allows independent transmission of each signal type, resolving the conflict between latency and PAPR.
2Reliability
If dedicated resources are allocated for SR and HARQ-ACK transmission, then transmission reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements dynamic resource allocation where the base station determines, based on transmission needs, whether to allocate the first resource block for SR, the second resource block for HARQ-ACK, or both. This dynamic approach ensures reliable transmission when needed while optimizing resource utilization by avoiding unnecessary allocations, thereby resolving the contradiction between reliability and efficiency.
3Speed
If 1-symbol PUCCH mode is used for low latency transmission, then transmission speed is improved, but the complexity of handling simultaneous SR and HARQ-ACK transmission increases
Solution Approach 1:
The patent pre-configures multiple PUCCH modes (first mode for SR only, second mode for HARQ-ACK only, third mode for both simultaneously) before actual transmission occurs. The base station and terminal agree on the appropriate mode in advance based on transmission requirements, which simplifies the real-time transmission process by eliminating the need for complex dynamic decision-making during the 1-symbol transmission window.
Data Source
AI summary
In a terminal, a signal allocation unit allocates uplink control information including at least one of a response signal responsive to downlink data and an uplink radio resource allocation request signal to a resource for an uplink control channel on the basis of a mode selected from among a plurality of modes relating to the channel configuration of the uplink control channel in accordance with an operating environment of the terminal. A transmitting unit transmits the uplink control information.