IP Multicast Transport for WiMAX Base Station Resource Efficiency
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Solution Overview
Problem
Current WiMAX access service network (ASN) architectures are inefficient due to the use of unicast IP transport for last hop links, leading to redundant data transmission across multiple base stations, resulting in suboptimal resource utilization, especially in multicast and broadcast services.
Innovation Solution
Implementing IP multicast transport mechanisms within the ASN, allowing a single data flow to be split across multiple base stations via an IP-multicast capable R6 interface, utilizing routers to distribute IP-multicast signals and GRE tunneling with selected GRE keys for efficient data path setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unicast IP transport is used for last hop links in WiMAX ASN, then individual data paths can be established to each base station, but redundant data transmission occurs across multiple base stations resulting in suboptimal resource utilization
Solution Approach 1:
The patent merges multiple unicast data paths into a single multicast data path by implementing IP multicast transport over the R6 interface between ASN-GW and base stations. This allows one data flow to be shared across multiple base stations simultaneously, eliminating redundant transmissions while maintaining reliable delivery through multicast group management protocols.
Solution Approach 2:
The R6 interface is enhanced to support both unicast and multicast IP transport modes, making it universally capable of handling different service types. The system can dynamically select between unicast and multicast based on service requirements, with multicast providing efficient one-to-many delivery for broadcast/multicast services and unicast maintaining compatibility for traditional services.
2Ease of operation
If unicast transport is used for MCBCS service, then individual connections can be maintained, but identical packets are sent over the last hop transport in several independent and synchronized copies resulting in inefficient resource usage
Solution Approach 1:
Multiple synchronized unicast connections carrying identical MCBCS packets are merged into a single multicast connection. The ASN-GW joins a multicast group and receives one copy of the data flow, which is then distributed to multiple base stations through the multicast-capable R6 interface, dramatically improving resource utilization while maintaining service functionality.
Solution Approach 2:
IP multicast protocol acts as an intermediary mechanism between the ASN-GW and multiple base stations. The multicast group membership management and data distribution are handled by the multicast protocol layer, freeing the application layer from managing individual connections while ensuring efficient resource usage through shared data paths.
3Adaptability or versatility
If multiple independent unicast data paths are established to base stations, then individual data flow control is possible, but bandwidth is wasted due to redundant transmission of the same data
Solution Approach 1:
The patent combines multiple unicast data paths into a single multicast data path for the downlink direction, where the same data is sent to multiple base stations. This merging reduces bandwidth consumption by eliminating redundant transmissions while maintaining the flexibility to use unicast for uplink traffic or services requiring individual data flow control.
Solution Approach 2:
The system implements dynamic path selection, allowing the network to adaptively choose between unicast and multicast transport modes based on service requirements. For MCBCS services, multicast is used for efficient downlink distribution, while unicast remains available for services requiring individualized data flow control or for uplink traffic.
Data Source
AI summary
An apparatus for providing IP multicast transport may include a processor and a memory. The memory may store exécutable instructions that in response to exécution by the processor cause the apparatus to at least perform opérations including receiving a key for encapsulation of multicast data at a base station, using the key to generate a response to a message indicative of a multicast connection for a particular service received from a gateway device, the base station being joined to a same multicast tree in a multicast-broadcast zone as the gateway device, and establishing the multicast connection with the gateway device via a multicast data path comprising a multicast tunnel associated with the key. Corresponding methods and computer program products are also provided.