A Multicast Mechanism in WiMax Mesh Network

Abstract

The IEEE standard 802.16x based broadband wireless Lots of multicast routing protocols are proposed for ad-hoc access is a promising technology to provide wireless broadband wireless networks. One category is called tree-based protocols connectivity. Besides Point to Multi-Point mode, a mechanism to (e.g. MAODV, ABAM, ADMR [3,4,5]) running on the similar create multi-hop network through Mesh mode is defined for the network topology as WiMax mesh network, in which there frequency spectrum band 2-11 GHz. The standard only defines unicast transmission under mesh mode, but does not specify exists only a single path for a source-receiver pair. Tree based multicast transmission scheme. This paper proposes a novel multicast protocols can be further divided into two types: multicast mechanism in WiMax mesh network by building a high source-tree-based and share-tree-based. In source-tree-based efficient multicast tree with utilization of scheduling messages multicast protocols, the tree is rooted at the source and each defined in the standard. An easy-to-implement tree construction session has its own multicast tree, whereas in shared-treealgorithm is presented based on the adjustment of the centralized based multicast protocols, a single tree is shared by all the routing tree. Simulation results show the proposed multicast sources within the multicast group. However, because of mechanism improves transmission efficiency and reduces group frequent topology changing in ad-hoc network, flooding latency over the traditional way to fulfill multicast by multiple message exchanging will be generated during the process of unicast transmissions.constructing and maintaining a multicast tree. Time durationIndex terms: WiMax, multicast, centralized scheduling,802.16to finish constructing may vary a lot under topology updating.Multicast routing protocol is independent of any specific I. Introduction unicast routing protocol to reduce the packet overhead and dependency[6], which is a common principle to design a IEEE 802.16 series standards based WiMax (Worldwide multicast routing protocol in ad-hoc networks. Interoperability for Microwave Access) networks provides In this paper, a multicast tree construction mechanism is multiple services for the broadband wireless access (BWA) proposed based on the unicast routing tree in WiMax mesh network. In addition to single-hop PMP (Point-to-Multipoint) network, therefore the feature of periodical updating and operation, specifications of Mesh mode were integrated into synchronization of routing tree will be inherited so that there the standard of IEEE 802. [1], which can be is no need to define new messages for multicast. At the same considered as a new approach to implement wireless mesh time, the broadcasting feature of omni-directional antenna is network (WIMN) [2]. The capability of self-organization in used to improve the transmission efficiency. Thus a global WMNs reduces the complexity of network deployment and unicast and partial broadcast are integrated into a unified maintenanc...

WIMAX Basics From PHY Layer to Scheduling And Multicasting Approaches

“…Studies that proposed scheduling schemas specifically for WiMAX mesh was also conducted. In [21] a Scheduling schema was proposed in which the authors tried to exploit more of the capabilities of the WiMAX technology for a better throughput. They make use of parallel transmission for this purpose.…”

A Source-Based Multicast Scheme in IEEE 802.16 Mesh Mode

“…Other classification exists based on link scheduling: In [5] the frame is proposed for downlink scheduling with multimedia traffic, in [6] a cooperative multicast scheduling scheme is proposed for IPTV service over IEEE 802.16 networks, which used two phase cooperative transmission to exploit the spatial diversity gain among nodes. The other classification is related to multicast mechanisms: in [3] the mechanism is proposed based on tree that generated traffic in source is transmitted to rendezvous point as BS, then a tree is constructed with the root to BS and traffic through this tree is transmitted to group members. In [7] is proposed an efficient MAC layer multicast approach that use a reserved field of MCA-REQ message for mapping the multicast address to CID (connection ID).…”

“…Dijkstra algorithm has used in previous schemes like [3] for construct routing tree among source and group members in which propagation delay has consider as link weight between two nodes. For construction of tree, we evaluate both propagation delay and bandwidth between two nodes.…”

“…The basic approach for multicasting is to establish a multicast tree for a group of node that constitute the multicast session. How to construct a multicast tree in mesh mode is undefined in the standard [3].…”

“…The basic approach for multicasting is to establish a multicast tree among group members [3]. In this paper, we propose a scheme to construct multicast tree among group members and the source of packet generator, however in the constructed tree, some nodes use unicast transmission and others under special condition use broadcast transmission.…”