IP Network Band Reservation for AV Stream Switching
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Solution Overview
Problem
In IP multicast transmission, efficiently securing transmission bands between transmission and reception apparatuses is challenging, as existing methods like RSVP-TE reserve a single band, which is not suitable for varying bandwidth requirements and lacks centralized management, potentially disrupting other network traffic.
Innovation Solution
A communication control device and system that acquires channel information, calculates maximum traffic, and reserves transmission bands on an IP network based on this traffic to ensure efficient band allocation without affecting other traffic, using a network resource management server to manage relay apparatuses and reserve bands centrally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmission band is reserved using existing methods like RSVP-TE, then band reservation is simplified, but it cannot accommodate varying bandwidth requirements of different data streams
Solution Approach 1:
The patent segments the transmission band reservation into multiple discrete bands, each allocated to specific data streams based on their individual bandwidth requirements. Instead of reserving a single aggregated band, the system divides the total bandwidth into multiple smaller bands that can be independently managed and assigned to different multicast groups, thereby accommodating varying bandwidth requirements while maintaining manageable complexity through structured allocation
Solution Approach 2:
The patent implements dynamic band reservation where the transmission bands are not fixed but can be adjusted based on real-time network conditions and data stream requirements. The reservation system dynamically allocates and reassigns bands as data streams are added, removed, or modified, allowing the system to adapt to changing bandwidth demands while maintaining efficient resource utilization
2Reliability
If transmission bands are reserved without considering switching patterns, then reservation process is simplified, but data stream interruptions may occur during switching
Solution Approach 1:
The patent performs preliminary traffic calculation by analyzing all possible switching patterns before finalizing band reservations. The system pre-calculates the maximum traffic that may flow through each network link considering all potential switching scenarios, and reserves bands accordingly in advance. This preliminary action ensures that sufficient bandwidth is guaranteed for any switching pattern that may occur, preventing data stream interruptions while maintaining reliable transmission
Solution Approach 2:
The patent introduces a communication control device as an intermediary between the data streams and the network infrastructure. This intermediary device performs the complex traffic calculation and band reservation tasks, shielding the actual transmission system from complexity. The control device acts as a mediator that translates switching patterns into appropriate band allocations, ensuring reliability without burdening the network infrastructure with complex calculation logic
3Reliability
If all available bandwidth is reserved for multicast transmission, then multicast data streams are guaranteed, but other network traffic is affected
Solution Approach 1:
The patent applies local quality by allocating transmission bands specifically to multicast data streams only where and when needed, rather than reserving bandwidth globally. The band reservation is localized to specific network links and time periods based on actual multicast traffic requirements. This allows other network traffic to utilize available bandwidth in segments where multicast is not active, ensuring multicast reliability while maintaining overall network productivity through efficient localized resource allocation
Solution Approach 2:
The patent implements periodic review and adjustment of band reservations based on actual network usage patterns. Rather than permanently reserving all allocated bands, the system periodically evaluates whether reserved bands are currently needed for multicast transmission and releases them for general network use when not required. This periodic action ensures multicast transmission guarantees are maintained when needed while maximizing network throughput during periods when multicast demand is lower
Data Source
AI summary
[Object] To provide a communication control device configured to efficiently secure bands of an IP network in order to transmit data streams.[Solution] There is provided a communication control device including: a channel information acquisition unit configured to acquire, when AV streams are transmitted from a plurality of transmission apparatuses to one or more reception apparatuses on an IP network while being switched, all channel information from the transmission apparatuses to the reception apparatuses; a traffic calculation unit configured to calculate a maximum traffic generated in switching patterns of the transmission of the AV streams from the transmission apparatuses to the reception apparatuses, on the basis of the channel information acquired by the channel information acquisition unit; and a transmission band reservation unit configured to reserve a transmission band on the IP network, on the basis of the maximum traffic calculated by the traffic calculation unit.