Broadcast Service Continuity During Wireless Handover

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Solution Overview

Problem

There is a need for a method to seamlessly support continuity of broadcast services in wireless communication systems, particularly during handovers between base stations, to ensure uninterrupted service in mobile communication systems.

Innovation Solution

The method involves a user equipment (UE) and a base station (BS) exchanging radio resource control (RRC) messages to configure multicast and broadcast services, including temporary mobile group identity (TMGI) lists and radio link control (RLC) bearer information, to facilitate smooth handovers and maintain service continuity across different cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a handover command is transmitted to switch the serving base station, then the UE can access a new base station, but the broadcast service may be interrupted during the handover process

Engineering Contradiction:

Improvehandover capabilityVSAvoidbroadcast service continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The target base station is pre-configured with broadcast service information (TMGI list, RLC bearer information) before the handover is executed. This preliminary preparation ensures that when the handover occurs, the broadcast service can continue without interruption as the target base station is already ready to provide the service.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains broadcast service continuity by ensuring that the broadcast service is transmitted without interruption during handover. The source base station continues transmitting until handover completion, while the target base station is pre-prepared to take over, ensuring continuous service delivery to the UE throughout the handover process.

Inventive Principle:

Principle #20Continuity of useful action

2Reliability

If the source base station continues transmitting broadcast service until handover completion, then service continuity is maintained, but transmission resources are occupied longer

Engineering Contradiction:

Improvebroadcast service continuityVSAvoidtransmission resource occupation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The target base station receives and stores broadcast service information in advance before the handover is executed. This preliminary action allows the target base station to be ready to take over immediately when handover occurs, enabling the source base station to release transmission resources sooner while ensuring seamless service continuity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230124420A1Method and device for supporting continuity of broadcast service in wireless communication system

Publication Date: 2023.04.20 SAMSUNG ELECTRONICS CO LTD

AI summary

An operating method of a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure may include: receiving, from a first base station (BS), a radio resource control (RRC) message including multicast and broadcast service (MBS) configuration information; receiving an MBS from the first BS, based on the MBS configuration information; receiving, from the first BS, a handover command received from a second BS, based on information about the MBS; performing a handover to the second BS, based on the handover command; and receiving the MBS from the second BS, wherein the MBS is transmitted from the first BS until the handover is successful.