Multicast Capacity in MANET with Infrastructure Support

Multicast Capacity in MANET with Infrastructure Support

ABSTRACT:

We study the multicast capacity under a network model featuring both node’s mobility and infrastructure support. Combinations between mobility and infrastructure, as well as multicast transmission and infrastructure, have already been showed effective ways to increase it. In this work, we jointly consider the impact of the above three factors on network capacity. We assume that m static base stations and n mobile users are placed in an ad hoc network. A general mobility model is adopted, such that each user moves within a bounded distance from its home-point with an arbitrary pattern. In addition, each mobile node serves as a source of multicast transmission, which results in a total number of n multicast transmissions. We focus on the situations in which base stations actually benefit the capacity improvement, and find that multicast capacity in a mobile hybrid network falls into several regimes. For each regime, reachable upper and lower bounds are derived. Our work contains theoretical analysis of multicast capacity in hybrid networks and provides guidelines for the design of real hybrid system combing cellular and ad hoc networks.

EXISTING SYSTEM:

Many existing studies focus on the combinations of the above characteristics. Some aim to further increase the network performance, while others try to present a more realistic scenario. In, Liet al. explores the multicast capacity in a static hybrid network with infrastructure support. Establishing a multicast tree with the help of infrastructure and employing a hybrid routing scheme, they have showed that the achievable multicast capacity in a hybrid network. On the other hand, Huang, Wanget al. study the unicast capacity of mobile hybrid networks and jointly consider the influences of node’s mobility and infrastructure support on it. A per-node capacity is for strong mobility, and for weak and trivial mobility.

DISADVANTAGES OF EXISTING SYSTEM:

In a many existing systems the scalability is failure of throughput capacity and some of the failures in the mobility nodes, and in networks infrastructure.

PROPOSED SYSTEM:

 In this paper, we further study the multicast capacity scaling laws of a mobile hybrid network characterizing both mobility and infrastructure. In our model, each of the n users moves around a home-point within a bounded radius. An m wire-connected base station is placed in a wireless ad hoc network, of which the area scales with n. There are totally n_c clusters with radius r and the number of destinations in the multicast scheme is assumed as k. A multicast path can be generated with an infrastructure routing and a pure ad hoc routing, as well as a combination of both. Intuitively, in our hybrid routing scheme, we hope to circumvent the bottleneck of backbone transmission or wireless access for cellular networks and take the advantage of them, thus the capacity can be improved.

ADVANTAGES OF PROPOSED SYSTEM:

] Our work is the first one to consider the effect of a general mobility on multicast transmission. Furthermore, we study multicast capacity in a more realistic network model featuring both mobility and infrastructure support. As a result, our work generalizes both unicast and broadcast capacity results in MANETs and hybrid networks.

] We can prove that mobility is trivial and the network acts as a static one.

MODULES

1.     Scheduling policies

2.     Heterogeneous networks

3.     Transmission infrastructure

MODULES DESCRIPTION

SCHEDULING POLICIES

          In this Module, the information about the current and past status of the network, and can schedule any radio transmission in the current and future time slots, similar. We say a packet is successfully delivered if and only if all destinations within the multicast session have received the packet. In each time slot, for each packet p that has not been successfully delivered and each of its unreached destinations, the scheduler needs to perform the following two functions:

1.     Capture

The scheduler needs to decide whether to deliver packet to destination in the current time slot. If yes, the scheduler then needs to choose one relay node (possibly the source node itself) that has a copy of the packet at the beginning of the timeslot, and schedules radio transmissions to forward this packet to destination within the same timeslot, using possibly multi-hop transmissions. When this happens successfully, we say that the chosen relay node has successfully captured the destination of packet. We call this chosen relay node the last mobile relay for packet and destination. And we call the distance between the last mobile relay and the destination as the capture range.

2.     Duplication

For a packet p that has not been successfully delivered, the scheduler needs to decide whether to duplicate packet p to other nodes that does not have the packet at the beginning of the time-slot. The scheduler also needs to decide which nodes to relay from and relay to, and how.

HETEROGENEOUS NETWORKS

          In this Module, All transmissions can be carried out either in ad hoc mode or in infrastructure mode. We assume that the base stations have a same transmission bandwidth, denoted for each. The bandwidth for each mobile ad hoc node is denoted. Further, we evenly divide the bandwidth into two parts, one for uplink transmissions and the other for downlink transmissions, so that these different kinds of transmissions will not interfere with each other.

TRANSMISSION INFRASTRUCTURE

          In this Module, A transmission in infrastructure mode is carried out in the following steps:

1) Uplink: A mobile node holding packet is selected, and transmits this packet to the nearest base station.

2) Infrastructure relay: Once a base station receives a packet from a mobile node, all the other base stations share this packet immediately, (i.e., the delay is considered to be zero) since all base stations are connected by wires.

3) Downlink: Each base station searches for all the packets needed in its own sub region, and transmit all of them to their destined mobile nodes. At this step, every base station will adopt TDMA schemes to delivered different packets for different multicast sessions.

 

SYSTEM CONFIGURATION:-

HARDWARE REQUIREMENTS:-

ü Processor             -        Pentium –IV

ü Speed                             -        1.1 Ghz

ü RAM                    -        256 MB

ü Hard Disk            -        20 GB

ü Key Board            -        Standard Windows Keyboard

ü Mouse                  -    Two or Three Button Mouse

ü Monitor                -    SVGA

SOFTWARE REQUIREMENTS:

•         Operating system           : - Windows XP.

•         Coding Language :  C#.Net.

REFERENCE:

Zhenzhi Qian, Xiaohua Tian, Xi Chen, Wentao Huang and Xinbing Wang “Multicast Capacity in MANET with Infrastructure Support” - IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 2013