Cellular Base Station Edge Cell Unicast Switching for MBS Continuity
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Solution Overview
Problem
Existing multimedia broadcasting services in cellular networks face challenges in maintaining service continuity, particularly at the edges of the broadcasting area, where terminal devices may lose access to multimedia broadcast services due to unavailability or restricted transmission in certain cells, leading to disruptions in content delivery.
Innovation Solution
The solution involves a method where base stations identify edge cells within the multimedia broadcast service area and transmit control information to terminal devices, including an identifier and an indication to request multimedia broadcast service content as a unicast transmission, ensuring seamless service continuity by allowing devices to request and receive content even when moving out of the standard broadcast area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If standard broadcast transmission is used in MBS area, then resource-efficient delivery of multimedia content is achieved, but service continuity is lost at edge cells where broadcast is not available
Solution Approach 1:
The system dynamically switches between broadcast and unicast transmission modes based on the terminal device's location. When a terminal moves to an edge cell where broadcast is unavailable, the system transitions from standard broadcast transmission to unicast transmission, ensuring continuous service while adapting to changing conditions.
Solution Approach 2:
The patent introduces control information as an intermediary mechanism that guides terminal devices on how to receive content. This control information indicates whether a cell is an edge cell and instructs terminals to request content via unicast transmission when appropriate, bridging the gap between broadcast efficiency and unicast reliability.
2Reliability
If unicast transmission is used for all terminals, then service continuity is maintained, but resource efficiency of broadcast delivery is lost
Solution Approach 1:
The patent applies different transmission qualities to different locations: standard broadcast transmission is used in core MBS area cells for resource efficiency, while unicast transmission is used in edge cells for service continuity. This local differentiation resolves the contradiction by optimizing each area according to its specific requirements.
Solution Approach 2:
The system changes the transmission parameter (from broadcast to unicast) based on the terminal's location parameters. When a terminal enters an edge cell, the transmission mode parameter changes from broadcast to unicast, allowing the system to maintain service continuity while preserving broadcast efficiency for the majority of users.
3Adaptability or versatility
If broadcast transmission is restricted in certain cells, then network control is improved, but terminal devices lose access to multimedia content at edge cells
Solution Approach 1:
The network performs preliminary actions by transmitting control information in advance that indicates to terminal devices which cells are edge cells and how they should request content. This preliminary guidance ensures that terminals are prepared before they potentially lose broadcast access, maintaining ease of operation while preserving network control.
Data Source
AI summary
This document discloses a solution of maintaining service continuity in a multimedia broadcast service provided by a cellular network in a multimedia broadcast service area. A base station may transmit, in at least one cell provided by the base station, control information comprising an information element, wherein the information element may comprise an identifier of the multimedia broadcast service area and an indication that may cause at least one terminal device located in the at least one cell to request the multimedia broadcast service content as a transmission addressed to the at least one terminal device. The at least one terminal device may receive the control information comprising the information element that may cause the at least one terminal device to request the multimedia broadcast service content as the transmission addressed to the at least one terminal device.