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It mobile communication unit1 1. Wave Propagation Example electric field magnetic field propagation direction 5 6. The most common wireless technologies use radio.
Cellular System Overview 23 Dropped Call Rate DCR is a term in telecommunications denoting the fraction of the calls which, due to technical reasons, were cut off before the speaking parties had finished their conversation and before one of them had hung up.
This fraction is usually measured as a percentage of all calls. Handoff Main Steps 1. Initiation 2. Resource reservation 3. Execution 4. From the decision process point of view, one can find at least three different kinds of handoff decisions.
This mainly means allocation and release of radio channels and handoff management. Hard handoff - break-before-make 2. Soft handoff- make-before-break 3. Softer handoff- Softer handover is the situation where one base station receives two user signals from two adjacent sectors it serves.
The MS is linked to no more than one BS at any given time. The MS is linked to two BS for a brief interval of time.
Thus soft handover involves connection to more than one cell. Inter system handoff: If during ongoing call mobile unit moves from one cellular system to a different cellular system which is controlled by different MTSO, a handoff procedure which is used to avoid dropping of call is referred as Inter System Handoff.
Intra system handoff: If during ongoing call mobile unit moves from one cellular system to adjacent cellular system which is controlled by same MTSO, a handoff procedure which is used to avoid dropping of call is referred as Intra System Handoff.
The perception of dropped call rate by the subscribers can be higher due to: 1. The subscriber unit not functioning properly needs repair. The user operating the portable unit in a vehicle misused.
The user not knowing how to get the best reception from a portable unit needs education. The channel is allocated following an algorithm which accounts likelihood of future blocking within the cell. It requires the MSC to collect real time data on channel occupancy 67 Cellular Wireless Networks 68 This protocol deals with issues such as addressing, assigning multiplex channels to different users, and avoiding collisions.
This implies that relatively narrow filters are needed in each receiver and transmitter. Frames are repeated continuously 81 CDMA 85 You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips. Visibility Others can see my Clipboard. Cancel Save.
UNIT-one-IT2402-MOBILE COMMUNICATION unit 1 2 marks
It has a control unit, radio cabinets, antennas, a power plant, and data terminals. MTSO- The switching ofce, the central coordinating element for all cell sites, contains the cellular processor and cellular switch. It interfaces with telephone company zone ofces, controls call processing, provides operation and maintenance, and handles billing activities. There are two basic cellular systems; one is the circuit-switched system and the other is the packet-switched system.
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