Browse Prior Art Database

Virtual Multi-Gateway for Wireless Mesh Network by Using Remote Radio Head

IP.com Disclosure Number: IPCOM000174471D
Original Publication Date: 2008-Sep-24
Included in the Prior Art Database: 2008-Sep-24
Document File: 3 page(s) / 368K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Wireless Mesh Networks (WMN) is an innovative technology that offers a cost-effective and flexible solution for broadband services in the residential areas without any necessity for line-of-sight communication. WMNs are formed by a set of mesh nodes among which a small subset is directly connected to the wired network. The hierarchical structure of a WMN is illustrated in Figure 1. It has three levels. At the top of the hierarchy are the gateway nodes that are directly connected to the wired network. The second hierarchy level consists of nodes called AP (Access Points) or mesh nodes that forward the traffic in multi-hop fashion towards the gateway. At the third level of hierarchy are the mobile clients or the end users connected to the AP/mesh node for accessing the wired network services.

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Virtual Multi-Gateway for Wireless Mesh Network by Using Remote Radio Head

Idea: Xue Gang Huang, CN-Beijing

Wireless Mesh Networks (WMN) is an innovative technology that offers a cost-effective and flexible solution for broadband services in the residential areas without any necessity for line-of-sight communication. WMNs are formed by a set of mesh nodes among which a small subset is directly connected to the wired network. The hierarchical structure of a WMN is illustrated in Figure 1. It has three levels. At the top of the hierarchy are the gateway nodes that are directly connected to the wired network. The second hierarchy level consists of nodes called AP (Access Points) or mesh nodes that forward the traffic in multi-hop fashion towards the gateway. At the third level of hierarchy are the mobile clients or the end users connected to the AP/mesh node for accessing the wired network services.

WMNs are aimed to provide high bandwidth broadband connections to a large community and thus should be able to accommodate a large number of users with different application requirements for accessing the Internet. Since the gateways are responsible for forwarding the network traffic, they are likely to become bottlenecks in WMNs. The high concentration of traffic at the gateway can result in packet drops due to potential buffer overflows.

Each node has only limited resources for the data transport, since the WMN uses wireless air interface as the mesh link. Thus, it is nearly impossible to realize a large scale WMN with a single gateway. At present, there are two solutions for building a large scale WMN: The first solution splits the whole mesh network into several smaller mesh networks provided with at least one gateway. This solution has the advantage that it is easy to manage and to control. The disadvantage is that unused capacity of one cluster can not be used by the nodes in other clusters. The second solution uses several gateways depending on the number of mesh nodes in the area to increase the egress capacity of the network. The main disadvantage of this solution is that a lot of information has to be exchanged among gateways.

Furthermore, a potential congestion at the gateway can be detected based on the average queue length over a time period. If the queue is too long, an alert is raised and selective active sources receive notification messages to switch their internet attachment to an alternative less-congested gateway. The drawback of this solution is that it requires a lot of information exchange among gateways and mesh nodes.

It is proposed to build a large scale WMN by using a high capacity gateway and distributed remote RF (Radio Frequency) heads in the WMN. Figure 2 illustrates the proposed solution. A wireless node with external high speed wired connection is installed as the central gateway node fo...