GSM

The development of the simulator that will be implemented can be classified in two phases. The first phase is the development of a simulator, capable for the investigation of the typical handover procedure. The second phase will include the implementation of the LAH algorithm that will consider the location of the user. Simulations that will … Read more

Taking into account the algorithm LAH we have designed a LAH logical diagram, based on a general cellular handover architecture. The flowchart in Figure below is a general description of the procedures that have to be taken into account for combining the location information with the handover measurements to avoid the undesirable effects of current … Read more

Location-Aided Handover (LAH) Algorithm is actually a set of algorithms, which aims to solve the current handover procedure problems. The set of algorithms include current handover algorithm, fuzzy handover, handover algorithm based on the use of adaptive antennas, handover prioritization algorithm, etc. LAH is based on the CELLO Architecture, which is shown below: This figure clearly shows … Read more

Handover is the mechanism that transfers an ongoing call from one cell to another as a user moves through the coverage area of a cellular system. The number of cell boundary crossings increases because smaller cells are deployed in order to meet the demands for increased capacity. If we minimize the expected number of handovers … Read more

ERP,EIRP,dB and dBm calculation are Most important thing to take care in RF Planning of any site. Isotropic RF Source A point source that radiates RF energy uniformly in all directions (I.e.: in the shape of a sphere) Theoretical only: does not physically exist. Has a power gain of unity I.e. 0dBi. Effective Radiated Power … Read more

Which step to make clear before select any site at any location like equipment type, construction and link balance calculation which describe detail as below. Select Equipment Type For Site Select equipment for the cell depending on channel requirements Selection of antenna type and accessories. Locate Equipment On Site For Construction Drawing Plan of the … Read more

Here I write about selection of new site in rf planning, how step by step any new site planned is as per below. Prepare Initial Search Ring Note the latitude and longitude from planning tool. Get the address of the area from mapping software. Release the search ring with details like radius of search ring, … Read more

DTX has some effect on the RXQual distribution. Normally the BER is averaged over the duration of one SACCH frame lasting 0.48 seconds and consisting of 104 TDMA frames. However, four of these TDMA frames are used for measurements, so that only 100 bursts are actually transmitted and received. When DTX is in use and … Read more

Both the power control and the DTX are standard GSM features, which are designed to minimize the interfering transmission when possible. They are both mandatory features in the mobile terminals, but it is up to the network operator to decide whether to use them or not. DTX prevents unnecessary transmissions when there is no need … Read more

In a conventional non-hopping network, each call is transmitted on a single fixed frequency. This means that the interference situation in a network is also quite stable. Some calls may experience very little interference and the other calls may be interfered severely. Severe interference can be avoided by a handover, but the probability of finding … Read more