Channel Management for Point-to-Multipoint Cellular Services
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Solution Overview
Problem
Existing wireless cellular telephone systems face limitations in supporting a large number of participants in point-to-multipoint services due to the limited number of dedicated forward and reverse link channels, necessitating a method for efficient channel management that enables both group services and telephone services while minimizing resource waste.
Innovation Solution
The proposed solution involves assigning shared forward channels during active periods and dedicated reverse channels, with active subscribers modulating user and control data, and passive subscribers modulating control data, and using different forward and reverse links based on service activity states, allowing for efficient channel usage and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated forward and reverse link channels are assigned to each subscriber station for point-to-multipoint services, then communication reliability is improved, but the system capacity is limited due to the finite number of available channels
Solution Approach 1:
The patent implements dynamic channel assignment where subscriber stations transition between active and silent periods. During active periods, dedicated channels are assigned for reliable communication; during silent periods, channels are released or shared with other services. This dynamic allocation allows the system to maintain reliability when needed while maximizing overall capacity utilization.
Solution Approach 2:
The patent employs periodic active and silent periods in point-to-multipoint services. During active periods, dedicated channels ensure reliable communication; during silent periods, resources are freed for other uses. This periodic structure resolves the contradiction by ensuring reliability during service periods while preventing permanent channel occupation that would limit system capacity.
2Reliability
If dedicated channels are allocated for point-to-multipoint services, then service quality is improved, but resource waste increases due to channels remaining idle during silent periods
Solution Approach 1:
The patent implements periodic active and silent periods where dedicated channels are allocated only during active service periods. During silent periods, channels are released or made available for other services, eliminating resource waste while maintaining service quality during actual communication periods.
Solution Approach 2:
The system dynamically adjusts channel allocation based on service activity state. Channels are dedicated during active periods to ensure service quality, then dynamically released or shared during silent periods to prevent resource waste. This dynamic behavior resolves the contradiction between maintaining quality and avoiding waste.
3Adaptability or versatility
If the system supports both group services and telephone services with dedicated channels, then service versatility is improved, but channel availability decreases leading to increased channel allocation complexity
Solution Approach 1:
The patent implements dynamic channel sharing between point-to-multipoint and point-to-point services. Channels are allocated based on current service type and activity state, allowing the same physical resources to serve multiple service types at different times. This dynamic multiplexing achieves service versatility without proportionally increasing channel allocation complexity.
Solution Approach 2:
The patent makes communication channels universal by allowing them to serve both point-to-multipoint and point-to-point services. Through dynamic allocation and the concept of active/silent periods, single channels can be reused for different service types, achieving versatility without requiring separate dedicated infrastructure for each service type.
Data Source
AI summary
To enable both point-to-multipoint and point-to-point communication services in an existing cellular communication system infrastructure, a apparatus and system for channel management and overhead functions associated with use of the assigned channels for point-to-multipoint services in the cellular communication system infrastructure are described.