P2P data server in the IPTV transmission bottleneck in the solution (Figure)-IPTV, multicast, multicast - Communications Industry

P2P data server in the IPTV transmission bottleneck in the solution (Figure)-IPTV

, multicast, multicast - Communications Industry

Embedded technology in recent years with the rapid developments in the PC market is showing strong demand for streaming media technology, now there is a growing trend to shift the embedded platform. Personal portable and home appliances of the media consumer demand for the platform-shifting market opportunities. IPTV It is in this consumer revolution in the focus of cusp. Most of the industry that IPTV Contains a huge commercial interests, but still rarely involved, of whom one reason is the network speed. This article describes the peer network technology, namely peer (P2P) technology, will be applied to IPTV network transmission, you can make full use of each terminal in the downlink channel, and does not require Router Hardware support such as multicast, IPTV network transmission can provide a solution to the bottleneck problem.

One peer network technology 1. On the other network profile

Peer network (peer-to-peernetwork), often called P2P or peer to peer, the rise in recent years a new type of network technology. It broke in the transmission of traditional network client / server (C / S) model is formulated, the establishment of a client on the client's direct Communicate Mechanisms, such Communicate Way for the future development of the network provides a guideline. In such networks, each node both as a client, but also acts as their server, in a sense, each node are in the same position. On the concept of distributed network such as the successful expansion of the traditional mode of the server it will burden assigned to each node on the network, each node would have a limited storage and computing tasks to the more nodes in the network more resources to contribute node the more, the higher the quality of its services.

Contrast, the network is still dominated by the C / S service model, although in recent years, the end user's network bandwidth has increased annually, but users still have great feelings change, mainly because the major server is overwhelmed, significant increase in the number of users, the server and even the danger of collapse, at a time when idle link bandwidth is being wasted. The P2P mode network service, just be able to fully tap the network of free resources, no additional input, we can service more users. So we can see the advantages of peer network technology is self-evident, it will future network applications, and create significant value.

2. On the basic structure of such networks

Peer networks are generally different according to the organizational structure divided into three kinds.

(1) centralized peer networks Centralized peer network is not really the sense of a peer network, which is a cross between C / S mode with the P2P-based networks such as ideas on ways to expand the traditional networks. Centralized peer networks based on the central directory server, the programs for the network to provide directory inquiry services, delivering content without go through the central server. This network structure is relatively simple, greatly reduced the burden on the central server. However, there is still the central node, and easy to form a transmission bottleneck, scalability is also relatively poor, not suitable for large networks. However, centralized directory for small network management and control that's an optional program.

(2) unstructured distributed network No centralized structure of the distributed network and the most significant difference is that it is no central server, all nodes with communication between adjacent nodes, access to the entire network. In unstructured networks, the nodes using a query mechanism to search for the package the resources needed. Specific manner, a node will contain the query query packet is sent to adjacent nodes, the query packet approach to the spread of the spread in the network, because that way if not restrained, will cause message flooding, so General will set an appropriate survival time (TTL), the process of decline in the query, when the TTL value is 0, will not continue to send.

This unstructured way, organization is a loose nodes join and leave the more liberal, when the query popular content, it is easy to find, but if the demand for more popular content, the smaller the TTL is not easy to find , while the larger TTL value may easily lead to a greater flow of inquiries, especially when the network extended to a certain size, even if limited TTL value is small, still give rise to the rapid increase traffic. However, there are some rich network of resources, the so-called class of server nodes, can significantly increase the efficiency of query.

(3) the structure of distributed network

Structured distributed networks, distributed hash table based on the past few years (Distributed HashTable) technology research. The basic idea is to network all of the resources organized into a large table, the table contains the resources of the keywords and the address of the storage node, and then split after this table are stored in the network each node and going. When users search for the appropriate network resources, it can be stored and key words found in the hash table corresponding to the contents of the storage node in the node that contains the resources required to store the node address, and then launched search node information according to these addresses with the corresponding node connection and transmission resources. This is a technically more advanced peer network, it is highly structured, high scalability, nodes join and leave more freedom. This way for more large-scale networks.

2, on the other network technology in the IPTV Application

1.IPTV Status Domestic IPTV and P2P have been down in two different directions. As the IPTV and traditional television viewing, like, basically be seen as a cable television (CATV) or digital TV (DVB) upgrade, which followed the train of thought in the design of a central server with a similar pattern. In traditional ways, the network is essentially one-way broadcast channels, that is, the client can not afford or only very little ability to send up information, in this way, all the service content sent by the central server, all processing fully completed by the central server, can not be achieved P2P connections.

To C / S mode solution in the IPTV server bottlenecks, most of the current program be adopted multicast technology, and with the central server and edge server content distribution strategies (CDS) to achieve.

Multicast technology is also very popular in recent years, better than the broadcast networks in a multi-point transmission service technology. In the traditional one-to-multipoint communication, the server connection for each client must request the establishment of an independent connection, a

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