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Explain the difference between Ad-hoc network and infrastructure based wireless network.

written 8.4 years ago by teamques10 ★ 67k

•   modified 8.4 years ago

Mumbai University > Computer Engineering > Sem6 > Mobile Communication and Computing

Marks: 5M

Year: Dec 2015

mobile communication

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written 8.4 years ago by teamques10 ★ 67k

•   modified 8.4 years ago

Infrastructure mode	Ad-hoc mode
What is it?
In infrastructure mode, the communication occurs only between the wireless nodes and access points (AP) , but not directly between wireless nodes	In ad-hoc mode, each node communicates directly with other nodes, so no access point control is needed.
External Communication
Access points acts as a bridge to other wireless/wired network	Nodes in Ad-hoc can communicate if they are within the same range.
Physical needs
Physical infrastructure is needed	No physical infrastructure is needed.
Complexity
Designing is simple as most of the network functionality lies within AP and client is just a simple machine.	As no central co-ordination exists, we need to use decentralized MAC protocols such as CSMA/CA, with all nodes having same functionality. This shoots up the complexity and cost.
When it can’t be used:
It can’t be used in critical situations like disaster relief where no infrastructure is left.	It is not always fully connected as two mobile nodes may temporarily be out of range.
Applications
IEEE 802.11 & HIPERLAN2 are based on infrastructure mode.	Bluetooth is a typical ad-hoc network.
Channel Access
Most infrastructure based WLAN uses TDMA-based protocols	Most Ad-hoc based WLAN uses contention MAC protocols (e.g. CSMA)
Topology
Based on topology, one main advantage is the ability of infrastructure WLANs to provide wired network applications and services	Ad-hoc WLANs are easier to set-up and require no infrastructure

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