What is Handoff

Handoff refers to a process of transferring an ongoing active call / data session from one channel to another channel network.

Handoff is also called as ‘Handover’. 

What is Handoff in mobile communication

Handoff is the mechanism which transfers an ongoing call fromHandoff fromone cell to another cell as users are near to the coverage area ofone ofthe neighbouring cell.

White Frame CornerWhite Frame CornerClassification Of Handoff

# Networks type involved

Frequencies Engaged  # Number of Connection Involved  # Administrative Domains Involved  #Necessity of Handsoff  User Control allowance

Desirable Handoff Features

An efficient handoff algorithm can achieve many desirable features by trading off different operating characteristics.

Necessity of Handsoff

Handoffs can be classified based on need.

(i) Obligatory handoff (ii) Voluntary handoff

Handoff in 4G 

Heterogeneous Networks

Handoffs can be further defined as the transition of signal transmission between different cells.  A handoff scheme is required to preserve connectivity as devices move about, and at the same time curtail disturbance to ongoing as  transfers.

Handoff in 4G 

Heterogeneous Networks

* Horizontal handoff   * Desirable Handoff Features  * Handoff Process  * Voluntary and Obligatory Handoffs 

The integration of heterogeneous wireless networks is one of the most anticipated features of fourth-generation systems.  

One of the main challenges for seamless mobility is the availability of reliable horizontal (intrasystem) and vertical (intersystem) handoff schemes. Horizontal and vertical handoffs are integral components of future fourth-generation communications. 

Both horizontal and vertical handoff processes consist of a three phases:handoff decision, radio link transfer and channel ssignment.

Handoff Process

The integration of heterogeneous wireless networks is one of the most anticipated features of fourth-generation systems. 

Summary