Terminal Frequency Hopping Gap Management for PUSCH Latency

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Solution Overview

Problem

In 5G NR, the existing random access procedure lacks a suitable technology for frequency hopping during PUSCH transmission, which is essential for reducing latency and power consumption.

Innovation Solution

A terminal that acquires a gap length between the first and second hops in PUSCH transmission and performs frequency hopping by transmitting the first hop followed by the second hop after providing this gap length, thereby preventing interference and enabling efficient frequency hopping in the random access procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If frequency hopping is applied to PUSCH transmission in random access procedure, then latency and power consumption are reduced, but interference between user terminals may occur without proper gap management

Engineering Contradiction:

ImprovelatencyVSAvoidinterference

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the gap length between first and second hops based on whether frequency hopping is applied. When frequency hopping is enabled, a specific gap length is configured to prevent interference, while allowing rapid transmission when hopping is not used, thus reducing latency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system dynamically configures the gap length parameter based on the frequency hopping status. The control unit adapts the time gap between hops according to whether frequency hopping is applied, making the system flexible and context-aware to optimize both latency and interference prevention.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If frequency hopping is applied to PUSCH transmission in random access procedure, then power consumption is reduced, but device complexity increases due to gap length management

Engineering Contradiction:

Improvepower consumptionVSAvoiddevice complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The terminal autonomously determines whether frequency hopping is applied and self-configures the appropriate gap length without requiring complex external coordination. The control unit uses pre-configured parameters and simple logic to manage the gap, keeping the implementation straightforward while achieving power savings.

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If gap length is configured between first and second hops, then interference is prevented, but transmission time increases

Engineering Contradiction:

ImproveinterferenceVSAvoidtransmission time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent changes the gap length parameter dynamically based on the frequency hopping status. When frequency hopping is not applied, the gap length can be reduced or eliminated, minimizing transmission time. When frequency hopping is applied, the gap length is optimized to prevent interference while keeping the increase in transmission time acceptable.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20230328721A1terminal

Publication Date: 2023.10.12 NTT DOCOMO INC

AI summary

Disclosed is a terminal including: a control unit acquiring a gap length between a first hop and a second hop in PUSCH transmission to which frequency hopping in a random access procedure is applied; and a transmitting unit performing the PUSCH transmission by the first hop and then the PUSCH transmission by the second hop after the gap length.