NR PUCCH Short Long Duration Design for Resource Efficiency

Solution Overview

Problem

Next-generation wireless communication systems, such as 5G New Radio (NR), face challenges in efficiently managing uplink control channels to support diverse services and applications with varying performance dimensions, particularly in terms of resource allocation and interference mitigation across different user equipment (UE) devices and cell edges.

Innovation Solution

The implementation of short and long physical uplink control channels (PUCCH) using Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) with varying lengths, multiplexing techniques like frequency division multiplexing (FDM) and time division multiplexing (TDM, and the use of demodulation reference signals (DMRS) with constant amplitude zero autocorrelation (CAZAC) sequences to enhance resource efficiency and immunity to interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If short duration PUCCH is used for uplink control information transmission, then resource efficiency and latency are improved, but coverage and link budget are worsened

Engineering Contradiction:

Improveresource efficiencyVSAvoidcoverage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments PUCCH transmission into two distinct formats: short duration PUCCH (1-2 OFDM symbols) for resource efficiency and long duration PUCCH (4-14 OFDM symbols) for coverage extension. This segmentation allows the system to select the appropriate format based on service requirements, resolving the contradiction between resource efficiency and coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically selects between short and long PUCCH formats based on service type, channel conditions, and coverage requirements. The gNB configures the UE with multiple PUCCH formats, and the UE adapts its transmission format dynamically, allowing the system to optimize between resource efficiency and coverage on a per-transmission basis.

Inventive Principle:

Principle #15Dynamics

2Reliability

If long duration PUCCH is used for uplink control information transmission, then coverage and link budget are improved, but resource efficiency and latency are worsened

Engineering Contradiction:

ImprovecoverageVSAvoidresource efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments PUCCH transmission into two distinct formats: short duration PUCCH (1-2 OFDM symbols) for resource efficiency and long duration PUCCH (4-14 OFDM symbols) for coverage extension. This segmentation allows the system to select the appropriate format based on service requirements, resolving the contradiction between resource efficiency and coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically selects between short and long PUCCH formats based on service type, channel conditions, and coverage requirements. The gNB configures the UE with multiple PUCCH formats, and the UE adapts its transmission format dynamically, allowing the system to optimize between resource efficiency and coverage on a per-transmission basis.

Inventive Principle:

Principle #15Dynamics

3Productivity

If multiple UEs are multiplexed on the same PUCCH resources, then resource utilization is improved, but intercell interference increases

Engineering Contradiction:

Improveresource utilizationVSAvoidintercell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different multiplexing strategies to different PUCCH formats and service types. For short PUCCH, FDM with cyclic shifts provides local orthogonality within cells, while for long PUCCH, TDM with orthogonal cover codes provides frequency diversity and interference mitigation. This localized optimization of multiplexing quality resolves the contradiction between resource utilization and interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces demodulation reference signals (DMRS) with constant amplitude zero autocorrelation (CAZAC) sequences as intermediaries between multiple UEs sharing PUCCH resources. These reference signals enable precise channel estimation and interference cancellation, allowing multiple UEs to be multiplexed while maintaining low intercell interference through advanced receiver processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11252705B2Radio (NR) short and long duration physical uplink control channel (PUCCH) design

Publication Date: 2022.02.15 APPLE INC

AI summary

Technology for a user equipment (UE) operable to encode a New Radio (NR) short duration physical uplink control channel (PUCCH) for transmission to a Next Generation NodeB (gNB) is disclosed. The UE can identify uplink control information (UCI) for the UE. The UE can multiplex, using frequency division multiplexing (FDM) at the UE, the UCI and a pseudo-random sequence associated with a demodulation reference signal (DMRS) onto a plurality of subcarriers in one or more physical resource blocks (PRBs) of one or more orthogonal frequency division multiplexing (OFDM) symbols. The UE can encode the UCI and the pseudo-random sequence associated with the DMRS multiplexed onto the plurality of subcarriers of the one or more OFDM symbols for transmission on the NR short duration PUCCH to the gNB.