Zone-Based MBS Control Across Cells for Seamless Handover
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Solution Overview
Problem
Existing mobile communication systems face inefficiencies in providing multicast broadcast services (MBS) on a per zone basis, which are narrower than a cell, leading to suboptimal reception and management of MBS data.
Innovation Solution
A communication control method that includes broadcasting zone information, receiving and processing it by user equipment (UE), and performing operations like cell reselection or handover based on this information to efficiently receive MBS data within the specified zones, along with coordinated handover requests and session management between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multicast broadcast service is provided on a per cell basis, then service coverage is simplified, but service precision and user experience deteriorate due to inability to target specific zones
Solution Approach 1:
The patent divides the cell into multiple zones (e.g., zone A, zone B, zone C) and provides separate MBS configuration information for each zone. This segmentation allows precise targeting of specific geographic areas while maintaining manageable structure through standardized zone definitions and associated configuration parameters.
Solution Approach 2:
The patent implements zone-specific MBS configuration information that includes zone identifier, zone coverage area, and zone-specific parameters. Each zone can have customized service parameters tailored to local requirements, enabling differentiated service quality across different geographic areas within the same cell.
2Ease of operation
If user equipment receives system information in one cell, then information acquisition is simplified, but inability to access zone information in other cells prevents efficient MBS reception
Solution Approach 1:
The patent makes system information blocks universal by including zone information from multiple cells within a single SIB. The SIB contains both serving cell information and neighbor cell zone information, allowing UE to acquire both current and neighboring zone data through one information retrieval operation, thereby maintaining ease of operation while ensuring reliable MBS reception across cell boundaries.
3Ease of operation
If user equipment transmits notifications for MBS data regardless of zone location, then notification transmission is simplified, but network efficiency deteriorates due to unnecessary notifications from outside zones
Solution Approach 1:
The patent enables user equipment to autonomously determine whether to transmit notifications by comparing its own location information with the zone coverage area defined in the MBS configuration. The UE self-evaluates its eligibility based on stored zone information and makes autonomous decisions about notification transmission, eliminating the need for complex network-controlled filtering while improving network efficiency.
4Device complexity
If handover decisions ignore zone information, then handover processing is simplified, but MBS service continuity deteriorates during cell transitions
Solution Approach 1:
The patent performs preliminary action by pre-configuring zone information and MBS parameters in the handover request before the actual handover occurs. The target base station receives and stores zone information in advance, enabling seamless MBS service continuation without requiring complex real-time zone matching during the handover execution phase.
Data Source
AI summary
A communication control method is used in a mobile communication system for providing a multicast broadcast service (MBS) on a per zone basis, the zone being narrower than a cell. The communication control method includes broadcasting, by a base station configured to manage a first cell, in the first cell, system information including zone information indicating a zone where MBS transmission is to be performed in a second cell different from the first cell, receiving, by a user equipment located in the first cell, the system information, and performing, by the user equipment, a predetermined operation to receive MBS data within the zone based on the system information.