Radio Base Station Frequency Switch Latency Control

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Solution Overview

Problem

In 5G radio communication systems, especially for URLLC, there is a challenge in maintaining low latency and high reliability due to the need for frequent handovers and potential communication interruptions during gap sections when radio terminals switch frequencies, leading to increased latency in downlink transmission data.

Innovation Solution

A radio base station controls radio communication by allowing the radio terminal to measure a second radio frequency during a specified period, transmitting control signals with the new frequency information and transferring data addressed to the terminal during this period, thereby avoiding data loss and reducing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the radio terminal switches frequency to measure neighboring cells during gap section, then handover capability is improved, but downlink data transmission latency increases

Engineering Contradiction:

Improvehandover capabilityVSAvoiddownlink data transmission latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The base station transmits downlink data to the radio terminal during the gap section before the terminal completes frequency switching, so that data transmission does not need to wait for the terminal to return to the original frequency. This preliminary action eliminates the waiting time and reduces latency while maintaining handover capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the data transmission timing to coincide with the terminal's frequency switching schedule. The base station transmits data during the gap section when the terminal is switching frequencies, rather than using static timing that would require waiting for the terminal to complete switching. This dynamic approach resolves the contradiction between maintaining handover capability and reducing transmission latency.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the base station waits for the gap section to end before transmitting downlink data, then data loss is prevented, but transmission latency increases

Engineering Contradiction:

Improvedata loss preventionVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station performs data transmission during the gap section in advance, before the terminal completes frequency switching and returns to the original frequency. This preliminary transmission action ensures data is delivered without waiting, preventing latency while the system design inherently prevents data loss by coordinating transmission with the terminal's switching schedule.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The data transmission continues during the gap section rather than being interrupted or delayed until the gap ends. By maintaining continuous transmission activity during the frequency switching period, the system achieves both reliability and low latency, as the transmission is neither lost nor delayed.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If the radio terminal measures second radio frequency during gap section, then frequency diversity is improved, but communication interruption occurs

Engineering Contradiction:

Improvefrequency diversityVSAvoidcommunication interruption duration

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The base station transmits data during the gap section before the terminal completes frequency switching, so the terminal receives data during the frequency switching process itself rather than after. This preliminary transmission reduces the effective communication interruption duration while the terminal maintains frequency diversity by switching to measure neighboring cells.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically coordinates data transmission with the terminal's frequency switching behavior, transmitting data during the gap section when the terminal is switching frequencies. This dynamic coordination allows the terminal to maintain frequency diversity for handover purposes while minimizing communication interruption, as data transmission occurs concurrently with frequency switching rather than after.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11516720B2Radio base station, radio terminal, radio communication system, and data transmission method

Publication Date: 2022.11.29 1FINITY INC

AI summary

A radio base station that controls radio communication with a radio terminal using a first radio frequency includes: a controller that controls a period in which the radio terminal enables to measure a second radio frequency different from the first radio frequency; a transmitter that transmits a control signal including information regarding the second radio frequency and the period to the radio terminal; and a transfer unit that transfers data addressed to the radio terminal in a case where the data occurs during the period.