Multicast Priority Service Discovery with Reduced Latency
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Solution Overview
Problem
Current LTE multicast service announcement file delivery mechanisms suffer from increased latency and data processing times due to the large size of the file, which is exacerbated by the inclusion of information for all nationwide broadcasts, making it difficult to accommodate low latency communications required by emerging applications like autonomous driving and real-time vehicle-to-vehicle communication.
Innovation Solution
Implementing a user device that automatically connects to a multicast priority service with reduced latency by creating a priority service announcement file with limited scope, allowing for expedited parsing and delivery, and using a priority service discovery channel that pulses the file every 0.3 seconds, compared to the standard 1.7 seconds, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single universal service announcement file is used for all LTE multicast services, then comprehensive service information is provided, but file size increases and delivery latency increases
Solution Approach 1:
The patent divides the universal service announcement file into multiple priority-based segments (priority service announcement files). Each segment contains service information for specific priority levels, allowing the system to transmit only the necessary portion based on service urgency. This segmentation reduces the amount of data that needs to be transmitted for time-critical services while maintaining comprehensive information availability for non-urgent services.
Solution Approach 2:
The patent extracts high-priority service information from the universal service announcement file to create separate priority service announcement files. By taking out only the essential service information needed for low-latency applications, the system reduces file size and transmission time while still providing access to complete service information through the full announcement file for non-urgent cases.
2Adaptability or versatility
If service announcement file size increases to include all nationwide broadcasts, then service coverage is improved, but parsing time and processing time increase
Solution Approach 1:
The patent segments service announcement data by priority level, creating separate files for different service categories. User devices can selectively parse only the priority level files relevant to their needs, dramatically reducing processing time compared to parsing the complete universal service announcement file containing all nationwide broadcast information.
Solution Approach 2:
The patent implements partial action by having user devices parse only the necessary portion of service announcement files based on their service requirements. Instead of processing the entire universal service announcement file, devices perform partial parsing on priority-specific files, improving parsing speed while maintaining adequate service coverage for their specific needs.
3Loss of energy
If standard service discovery channel is used with 1.7 second pulse interval, then network resource usage is optimized, but connection time to multicast services increases
Solution Approach 1:
The patent implements dynamic pulse intervals for service discovery channels based on service priority. High-priority services use shorter pulse intervals (faster updates) while standard services use the conventional longer intervals. This dynamic adjustment allows time-critical applications to connect faster without permanently increasing network resource consumption across all services.
Solution Approach 2:
The patent applies different quality characteristics to different parts of the service discovery mechanism. Priority service discovery channels have higher update frequencies and lower latency characteristics, while standard channels maintain resource-efficient longer intervals. This local differentiation allows fast connection for urgent services without compromising overall network resource efficiency.
Data Source
AI summary
A device connects to a standard channel of a multicast network based on entering a service area, and receives a service announcement (SA) file via the standard channel. The device parses the SA file to determine a list of services identified in the SA file, and receives a selection of a priority service from the list of services. The device updates a priority counter associated with the priority service based on the selection. The device receives, after the period of time, information indicating entry into the service area, and determines that the priority counter satisfies a threshold based on receiving the information indicating entry into the service area. The device automatically connects to a priority channel of the multicast network, associated with the priority service, based on the priority counter satisfying the threshold, and receives a priority SA file, associated with the priority service, via the priority channel.