Describe Handoff in cellular networks.

Describe Handoff in cellular networks.
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1 Answer

Answer :

When a user talks on the mobile phone to other user it may happen that the mobile station moves  from one cell to another. During this conversation signal may become weak. To solve this  problem, the Mobile Switching Center (MSC) checks the level of the signal every few seconds.  If the strength of the signal is week then the MSC searches a new cell that can provide better  communication.
Handoff is the process by which a mobile telephone call is transferred from one base station to  another base station. There are two types of handoff.
- Hard Handoff
- Soft Handoff
Hard Handoff: In this process a mobile station only communicates with one base station. When  the mobile user moves from one cell to another, communication must first be broken with the  previous base station before communication can be established with the new one.
Soft Handoff: In this process a mobile station can communicate with two base stations at the  same time. This means that a mobile station may continue communicate with the new base  station before link is break off from the old one.
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