26-07-2014, 12:21 PM
Optimal Multicast Capacity and Delay Tradeoffs In MANETs
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ABSTRACT
In this paper, we give a global perspective of multicast capacity and delay analysis in Mobile Ad Hoc Networks (MANETs). Specifically, we consider four node mobility models:
EXISTING SYSTEM
In existing system, it was established in a static network with n, nodes
There has been tremendous interest in the networking has been research
community to understand the fundamental achievable capacity in wireless ad hoc network performance in terms of the capacity and delay has been a central issue
Heterogeneous networks with multi cast traffic pattern were studied by existing system
Wire base station are used and their transmission range can cover the whole network
One of the work in existing system studied a dense network. with fixed unit area the helping nodes in their network are wireless, but have higher power and only act as relays instead of source or destinations other existing work all study static networks
Disadvantage:
Limiting factors
Low redundancy.
PROPOSED SYSTEM
In Proposed System, assume that at each time slot, bits can be transmitted in a successful transmission. Mobility time scales: Two time scales of mobility are considered in this paper:
Fast mobility: The mobility of nodes is at the same time scale as the transmission of packets, i.e., in each time-slot, only one transmission is allowed.
Slow mobility: The mobility of nodes is much slower than the transmission of packets, i.e., multiple transmissions may happen within one time-slot.
ADVANTAGE
1. The advantage of dimensional mobility lies in the fact that it is simple and easily predictable, thus increasing the inter contact rate.
2. Though nodes are limited to only moving horizontally or vertically, the mobility range on their orbit lines is not restricted.
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.