Long PUCCH Slot Structure for 5G NR UCI Multiplexing
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in the design of the long physical uplink control channel (PUCCH) for 5G New Radio (NR), which affects the ability to efficiently schedule and multiplex uplink control information across different services such as enhanced mobile broadband, ultra-reliable low latency communication, and massive machine-type communications.
Innovation Solution
The proposed solution involves a detailed design for the slot structure of the long PUCCH, including specific formats, demodulation reference signal (DMRS) patterns, and frequency hopping mechanisms to support more than 2 bits of uplink control information (UCI) payload, optimizing DMRS locations and orthogonal sequences for improved multiplexing and resource allocation across multiple slots and symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detailed slot structure design for long PUCCH is implemented, then flexibility and efficiency of UCI transmission is enhanced, but device complexity increases
Solution Approach 1:
The long PUCCH slot structure is divided into multiple segments including DMRS symbols, UCI data symbols, and frequency hopping points. Each segment can be independently configured and optimized, allowing flexible adaptation to different service requirements while managing complexity through modular design.
Solution Approach 2:
The patent implements dynamic slot structure configuration where DMRS positions, frequency hopping patterns, and symbol allocations can be adjusted based on traffic conditions, service type, and channel characteristics. This dynamic adaptability enhances flexibility without requiring complete redesign for each scenario.
2Productivity
If DMRS locations are optimized for improved multiplexing, then capacity increases, but measurement precision requirements increase
Solution Approach 1:
Different DMRS placement strategies are applied to different regions of the slot structure based on local requirements. For example, DMRS are positioned at specific symbols depending on the service type (eMBB, URLLC, mMTC), allowing optimized multiplexing capacity in each region while maintaining adequate measurement precision through localized adaptation rather than uniform high-precision requirements across the entire slot.
3Reliability
If frequency hopping mechanisms are implemented, then reliability of UCI transmission is improved, but device complexity increases
Solution Approach 1:
Frequency hopping is implemented with periodic patterns where the PUCCH frequency changes at predetermined intervals or after specific numbers of symbols. This periodic structure provides reliable frequency diversity for UCI transmission while maintaining manageable complexity through regular, predictable hopping behavior rather than complex adaptive algorithms.
4Productivity
If orthogonal sequences are optimized for multiplexing, then capacity increases, but ease of operation decreases
Solution Approach 1:
The patent optimizes orthogonal sequences by adjusting parameters such as sequence length, modulation order, and resource element mapping patterns to increase multiplexing capacity. While this enhances productivity, it simultaneously increases the complexity of resource allocation and configuration, making operation less straightforward and requiring more sophisticated scheduling algorithms.
Data Source
AI summary
A user equipment (UE) is described. The UE includes a processor and memory in electronic communication with the processor. Instructions stored in the memory are executable to determine the uplink control channel (PUCCH) format and configuration based on a signaling from a base station (gNB). The instructions are also executable to determine the demodulation reference signal (DMRS) locations in the configured PUCCH. The instructions are further executable to determine the uplink control information (UCI) multiplexing methods on the configured PUCCH. The instructions are additionally executable to determine the resource of the control channel for UCI feedback. The instructions are also executable to transmit UCI feedback on the selected control channel.