Base station in wide-band wireless access-in system and method for realizing multi-cast business
An access system, broadband wireless technology, applied in the transmission system, wireless communication, digital transmission system, etc., can solve the problems of waste of air interface bandwidth resources, insecurity, network bottlenecks, etc., to save bandwidth resources, ensure security, reduce The effect of power consumption
Inactive Publication Date: 2009-04-15
HUAWEI TECH CO LTD
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This implementation method is relatively simple, but it also has certain disadvantages: it increases the processing burden of receivers who do not need multicast messages, and also increases the power consumption of SS equipment
In addition, hosts that have not joined the group can also receive multicast packets, which will lead to an unsafe situation
[0007] b. According to certain rules (for example, it can be manually configured), change the multicast message into a unicast message and send it to the SS in need, so that only the receiver (SS) who needs the multicast message will receive it However, in this implementation method, BS equipment or other equipment is required to implement the multicast replication function, which increases the complexity of the equipment. For example, if there are many SSs in the multicast group, they need to be copied one by one To each SS, this will increase the complexity of the BS equipment, and also greatly waste the bandwidth resources of the air interface. Due to traffic duplication, it will easily become the bottleneck of the network
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[0026] The host referred to in the present invention refers to a node (non-router) that cannot forward IP data packets that are not explicitly addressed to itself. Typically, hosts are the source and destination of IP traffic. A host silently discards traffic it receives that is not explicitly addressed to itself, as in Figure 1 to Figure 3 The user in can be thought of as a form of host.
[0027] See Figure 4 As shown in the layered system of the multicast protocol, it can be seen that the Internet Group Management Protocol (Internet Group Management Protocol, IGMP) is at the bottom of the multicast protocol and is the basis of the entire multicast protocol. IGMP is used for routers to join hosts Or leave the multicast group for dynamic management, and establish a three-layer multicast address forwarding table. Among the multicast protocols, only the IGMP protocol directly communicates with on-demand hosts. The router running IGMP is responsible for managing the joining ...
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A base station(BS) of wideband wireless access system includes: message obtaining module used for obtaining the group-broadcast protocol message between user station and router; group-broadcast address forwarding list maintaining module used for maintaining group-broadcast address forwarding list according to the type of obtained message; establishing group-broadcast module used for distributing same connection sign for all the user stations in the group-broadcast group, and managing the said user stations n the group-broadcast group according to the connection sign and maintained group-broadcast address forwarding list. A method for realizing group-broadcast service in wideband wireless access system includes the following steps: obtaining the group-broadcast protocol message between user station and router and maintaining group-broadcast address forwarding list according to the type of obtained message; distributing same connection sign for all the user stations in the group-broadcast group and managing the said user stations n the group-broadcast group according to the connection sign and maintained group-broadcast address forwarding list. Both the BS and the method provided in the invention can save bandwidth resource in the air.
Description
technical field [0001] The present invention relates to a broadband wireless access system, in particular to a base station in the broadband wireless access system and a method for realizing multicast service. Background technique [0002] Traditional IP communication (such as IPv4 communication) is performed between a source IP host and a target IP host (unicast) or between a source IP host and all IP hosts in the network (broadcast). If we want to send information to multiple but not all IP hosts in the network, either broadcast or the source IP host sends IP packets to multiple target IP hosts in the network. The former method not only wastes bandwidth by sending information to unnecessary IP hosts, but may also cause a serious broadcast storm due to routing loopbacks; the latter method wastes a lot of bandwidth due to repeated sending of IP packets, and also Increased server load. It can be said that the traditional IP communication technology cannot effectively solve ...
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IPC IPC(8): H04L12/56H04L12/28H04L29/06H04W4/06H04W4/08H04W88/08
CPCH04W76/002H04W72/121Y02B60/50H04W88/08H04L45/16H04W76/40Y02D30/70
Inventor 凌魏
Owner HUAWEI TECH CO LTD