MBSFN MCCH Modification Period Configuration for Public Safety Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in LTE architecture, face challenges in supporting public safety group communication due to the inflexible MCCH modification period, which results in unacceptably high latency and resource inefficiencies, especially when multiple MCCHs are used for different services like mobile TV and public safety.
Innovation Solution
The method involves configuring multiple MCCHs per MBSFN area with independently adjustable modification periods, allowing for a shorter modification period for additional MCCHs dedicated to public safety services, and scheduling MTCHs from different MCCHs to share the same physical multicast channel without resource collisions, enabling efficient radio resource allocation at the subframe level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single MCCH with fixed modification period is used for all services in an MBSFN area, then system complexity is reduced and resource allocation is simplified, but latency for time-critical services like public safety communication cannot be reduced below the fixed period
Solution Approach 1:
The patent divides the single MCCH into multiple independent MCCHs (first MCCH and second MCCH) within the same MBSFN area. Each MCCH can have different modification periods tailored to specific service requirements. The first MCCH serves general services with standard modification periods, while the second MCCH is dedicated to public safety services with configurable shorter modification periods, thereby reducing latency for time-critical applications without unnecessarily complicating the entire system.
Solution Approach 2:
The patent introduces dynamic configurability where the modification period of the second MCCH can be independently adjusted based on service requirements. This allows the system to adapt the MCCH modification period dynamically - using longer periods for non-critical services to save resources and shorter periods for public safety services to reduce latency, making the system flexible rather than rigid.
2Adaptability or versatility
If multiple MCCHs with different modification periods are configured per MBSFN area, then service-specific optimization is achieved, but resource allocation complexity and scheduling overhead increase
Solution Approach 1:
The patent segments the MCCH functionality into multiple specialized channels (first MCCH for general services, second MCCH for public safety services). Each segmented MCCH handles specific service types with appropriate modification periods, allowing service-specific optimization while keeping each individual MCCH relatively simple and manageable.
Solution Approach 2:
The patent applies different modification period characteristics to different MCCHs based on local service requirements. The first MCCH uses standard modification periods suitable for general mobile TV and data services, while the second MCCH uses shorter modification periods specifically for public safety services. This local differentiation optimizes performance for each service type without requiring all MCCHs to be complex.
3Loss of time
If MCCH modification period is reduced for public safety services, then latency is reduced improving response time, but radio resource consumption increases
Solution Approach 1:
The patent segments radio resource usage by creating separate MCCHs for different service types. The second MCCH dedicated to public safety services uses shorter modification periods only when public safety services are active, while the first MCCH continues with standard modification periods for other services. This segmentation ensures that increased resource consumption is localized only to the necessary public safety transmissions rather than affecting the entire system.
Solution Approach 2:
The patent implements dynamic resource allocation where the second MCCH with shorter modification periods is activated only when public safety services require it. When no public safety services are present, the system can rely on the first MCCH with standard modification periods, thereby dynamically adjusting resource consumption to match actual service needs rather than permanently allocating additional resources.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method, performed in a wireless telecommunication system providing communication services to multiple user equipment (UE) devices across multiple cells of the system and supporting broadcast information services in one or more multimedia-broadcast multicast-service single frequency network (MBSFN) areas of the system, comprising providing a first point-to-multipoint multicast control channel (MCCH) and at least one additional MCCH channel per MBSFN area.