Multicast Broadcast Synchronization in Radio Access Systems
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Solution Overview
Problem
Current methods for providing multicast broadcast services in wireless networks lack efficiency in ensuring synchronization and accurate packet transmission among multiple radio access systems, particularly in wideband wireless access communication systems.
Innovation Solution
The method involves processing and transmitting multicast broadcast data packets with synchronization information to multiple radio access systems, allowing them to concurrently transmit the same packets to portable subscriber stations, achieving synchronization and a macro diversity effect for stable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RASs simultaneously transmit the same packets to PSS using multiple access method, then the PSS can receive accurate packets through merging, but synchronization between multiple RASs becomes complex and difficult to maintain
Solution Approach 1:
The patent merges the packet transmission process across multiple RASs by having them all transmit identical packets simultaneously to the same PSS. The PSS merges these received packets to achieve accurate reception. This combining approach allows multiple RASs to contribute to reliable packet delivery without requiring complex inter-RAS synchronization, as each RAS independently transmits the same data.
Solution Approach 2:
The patent uses copying by having multiple RASs transmit identical copies of the same packets to the PSS. Each RAS receives a copy of the packet from the network and transmits it simultaneously. This copying mechanism ensures that all RASs send the same data without requiring complex synchronization, as they are essentially replicating the same transmission.
2Stability of the object's composition
If multiple RASs transmit packets concurrently to achieve macro diversity effect, then transmission stability improves, but the requirement for identical packet size and location insertion increases system complexity
Solution Approach 1:
The patent applies homogeneity by requiring all RASs to transmit packets with identical characteristics - same packet size, same location within the frame structure, and same timing. This homogeneous approach simplifies the system because each RAS follows the same transmission template, eliminating the need for complex adaptive packet insertion logic while ensuring stable macro diversity transmission.
Solution Approach 2:
The patent uses preliminary action by pre-defining the packet insertion locations and sizes in the transmission frame structure before actual data transmission begins. The frame structure is predetermined with specific slots for MBS packets, so RASs simply insert packets at these pre-assigned locations without requiring complex real-time decision-making, thus simplifying the insertion process while maintaining stability.
3Reliability
If synchronization information is included in multicast broadcast data packets, then coordination between RASs improves, but the overhead of the data packet increases
Solution Approach 1:
The patent applies universality by designing the synchronization information to serve multiple functions simultaneously. The same synchronization fields in the packet header are used for both timing alignment and packet identification across multiple RASs. This multi-functional approach provides necessary coordination between RASs without requiring separate dedicated synchronization messages, thus minimizing the overhead increase.
Data Source
AI summary
In a communication system, a plurality of radio access systems (RASs) respectively receives connection resources from an MBS server for transmitting a multicast broadcast data packet. The MBS server is involved in transmission of the multicast broadcast data packet. Then, the plurality of RASs receive the multicast broadcast data packet including parameters for synchronization between the plurality of RASs and parameters for size and location of the multicast broadcast data packet and deliver the received multicast broadcast data packet to a portable subscriber station (PSS). Thereby, the plurality of RASs can transmit the multicast broadcast data packets with the same location and the same size to the PSSs at the same time.