Why soft handover and softer handover are used in WCDMA?

Why soft handover and softer handover are used in WCDMA?

Handovers are an important part of every cellular communication system. Especially in WCDMA two special types of handovers have been introduced; soft and softer handovers, allowing a mobile user to use 2 separate air interface channels when being in the overlapping area of two adjacent sectors.

What is soft handover in 3G?

3G UMTS soft handover Soft handover is a form of handover that was enabled by the introduction of CDMA. Soft handover occurs when a UE is in the overlapping coverage area of two cells. Links to the two base stations can be established simultaneously and in this way the UE can communicate with two base stations.

Can you have soft handover in GSM?

Soft and softer handovers are only possible when UE is in connected state with dedicated channel (DCH). Even with HSDSCH (High-Speed Downlink Shared Channel) there is no soft handover in UMTS. In cased HSDPA communication there is only hard handover which is break before connect.

What is soft and hard handover?

Hard Handover:- When mobile(in Call) switches to a new sector/Cell which is on different frequency , then it performs hard Handover. It is basically an inter-frequency handover. SOft Handover:- When mobile ( in Call) switches to a new sector/cell which is on the same frequency then it is called a soft handover.

What is the advantage of a soft handoff?

Soft handoff is one of the major advantages of using CDMA systems. TDMA and FDMA cellular systems. known advantages are fade margin improvement and higher reverse link capacity.

Which is soft handover?

Soft handover or soft handoff refers to a feature used by the CDMA and W-CDMA standards, where a cell phone is simultaneously connected to two or more cells (or cell sectors) during a call. Soft handover results in a diversity gain called soft handover gain.

Is soft same as smooth?

Usually, smooth refers to the surface texture of something, and soft refers to the solidity of something. A burlap bag full of feathers can be soft but not smooth. A piece of glass is smooth, but not soft.

What is the difference between a soft handoff and a softer handoff?

Soft handover – handover between two sectors of the same cell of a NodeB is called soft handover. Softer handover – handover between two cells (different NodeB) is called softer handover.

What is softsoft handover?

Soft handover or soft handoff refers to a feature used by the CDMA and W-CDMA standards, where a cell phone is simultaneously connected to two or more cells (or cell sectors) during a call.

Why soft handover is possible in CDMA?

Soft handover is possible in CDMA because adjacent cells can operate on the same frequencies as long as they use different scrambling codes. So, a UE can listen to two different cells by decoding the received signals twice, using a scrambling code from each cell on each for each decoded signal.

What is intra-frequency soft handover?

Intra-Frequency soft handover is a function in which the UE is connected to several cells at the same time. Addition or release of radio links are controlled by the ACTIVE SET UPDATE procedure. A UE is in the overlapping cell coverage area of two sectors belonging to different base stations.

What is compressed mode handover?

Compressed mode handover: Using compressed mode handover the UE uses the gaps in transmission that occur to analyse the reception of local GSM base stations. The UE uses the neighbour list provided by the UMTS network to monitor and select a suitable candidate base station.