Base Station Video Loopback for Trunking Terminals
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Solution Overview
Problem
Video surveillance systems face significant transmission delays due to network bandwidth and distance limitations, making real-time data transmission to trunking terminals challenging, especially in applications like airport or hotel security where immediate action is required.
Innovation Solution
A data transmission method that involves receiving video data from a video capture terminal, identifying the relevant bearer using loopback indication information, and directly sending the video data to a trunking terminal, bypassing the core network to reduce latency, by setting up evolved packet bearers and using mobility management entities to manage bearer setup and loopback requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If video data is transmitted through the core network using conventional Internet technology, then the system can achieve wide coverage and remote access, but the transmission delay increases significantly and real-time surveillance requirement cannot be ensured
Solution Approach 1:
The network transmission path is segmented into core network transmission and local access network transmission. Video data is routed through the core network to reach the general area, then transmitted locally through the access network to the target terminal. This segmentation allows the data to bypass the core network's long-distance routing for local destinations, significantly reducing transmission delay while maintaining the ability to achieve wide coverage through the core network infrastructure.
Solution Approach 2:
A gateway device is introduced as an intermediary between the core network and the access network. The gateway receives video data from the core network, determines whether the target terminal is within the coverage area of the access network, and selectively routes data through the access network for local terminals or through the core network for remote terminals. This intermediary enables intelligent path selection that optimizes transmission delay based on the target's location.
2Reliability
If video data is transmitted through the access network directly, then real-time transmission can be achieved, but the coverage area is limited and remote access capability is reduced
Solution Approach 1:
The system dynamically selects the transmission path based on the target terminal's location and the specific surveillance requirements. For local terminals within access network coverage, the system uses the access network path for real-time transmission. For remote terminals or when access network resources are unavailable, the system automatically switches to core network transmission. This dynamic adaptation ensures real-time transmission reliability when possible while maintaining remote access capability when needed.
Solution Approach 2:
The transmission system is designed to support multiple transmission modes (access network mode and core network mode) within a single unified architecture. The gateway device can handle both local and remote transmission requests, and the system can adaptively switch between different transmission paths. This multi-functionality ensures that the system can achieve real-time transmission for local surveillance while maintaining the ability to provide remote access coverage.
3Productivity
If multiple bearers are set up for multiple video streams, then the system can handle multiple surveillance targets simultaneously, but the resource consumption and system complexity increase
Solution Approach 1:
The system pre-establishes bearers between the gateway and access network base stations for multiple video streams in advance. When video surveillance data needs to be transmitted, the pre-established bearers are already available for immediate use, eliminating the need for real-time bearer setup and reducing transmission delay. The gateway device can determine which pre-established bearers to use based on the target terminal's location, optimizing resource utilization while maintaining the ability to handle multiple surveillance targets simultaneously.
Data Source
AI summary
A data transmission method is disclosed. N streams of video data uploaded by a video capture terminal are received, where N is an integer greater than or equal to 1; loopback indication information sent by a mobility management entity or the video capture terminal is received, where the loopback indication information carries an identifier of a bearer of video data to be looped back; according to the identifier of the bearer of the video data to be looped back, the video data to be looped back corresponding to the identifier of the bearer of the video data to be looped back is confirmed; and the video data to be looped back is sent to a trunking terminal. In the data transmission method, data that the trunking terminal needs to monitor is directly looped back at the base station.