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Advantages of Multi layer frequency Reuse Pattern

Capacity increase when reuse density is multiplied: Supposing there are 300 cells Bandwidth: 8 MHz (40 frequency) Normal 4*3 reuse: reuse density=12 Network capacity = 40/12 * 300 = 1000 TRX Multiple reuse: “0” BCCH layer: re-use =14,  (14 frq.) “+” Normal TCH layer: re-use =10, (20 frq.) ” ^-“ Aggressive TCH layer: re-use = … Read more

Multi layer Frequency Reuse Pattern in GSM

Multi-layer reuse pattern technology means to divide the whole frequency resources into different subgroups according to specific principles. Each subgroup allocates frequency carriers to every cell by means of different reuse models, so the reuse density of each frequency carrier as well as the interference will be different in each cell. The frequency carrier with … Read more

BTS Color Code BCC in GSM

BCC is a part of BSIC. For its function, please refer to above sections. BCC is composed of 3 bits. The available range is from 0 to 7. BSIC includes BCC and NCC which is transmitted on SCH. BCC is a part of BSIC, used to identify different cell with the same BCCH in the … Read more

What is Frequency Hopping in GSM

When using close frequency reuse technique, system interference is the most important factor for frequency reuse ratio. Usually, power control and discontinuous transmission technologies are adopted to lower system interference. To prevent interference and improve system communication quality under the same interference condition, frequency hopping technology is used. Therefore, frequency hopping is a very important … Read more

Comparison between Multi layer Reuse and 1*3 in GSM

Multi-layer reuse pattern is a gradual process for TCH frequency planning. In other words, the reuse is rather loose in TCH1 layer and it is quite close in the last TCH layer .The reason for this pattern is that base band hopping is used in the Multi-layer reuse pattern. When there are rather few frequency … Read more

Comparison Between Status of Mobile Ideal and Mobile Busy

MOBILE IDLE When the mobile is idle, it listens to the best cell to camp. Mobile decides to choose the cell by itself without the help of BSC. This is done by comparing signal strength of each BCCH frequency and if found the strongest then it will camp once the C1 > 0 (Cell Selection … Read more

How Cell Selection in GSM

Once the mobile is switched on and the registered home PLMN was selected (e.x. SMART), it will next search for a BCCH frequency list, stored in its memory or in its SIM card. The list can have up to 32 BCCH frequencies for the mobile to scan. This reduces the time of cell selection, compared … Read more

Work of MA, HSN and MAIO in GSM

Mobile Allocation The MA is a list of hopping frequencies transmitted to a mobile every time it is assigned to a hopping physical channel. The MA-list is a subset of the CA list. The MA-list is automatically generated if the baseband hopping is used. If the network utilizes the RF hopping, the MA-lists have to … Read more

What is Cell Allocation in GSM

The Cell Allocation (CA) is a list of all the frequencies allocated to a cell. The CA is transmitted regularly on the BCCH. Usually it is also included in the signaling messages that command the mobile to start using a frequency hopping logical channel. The cell allocation may be different for each cell. In GSM … Read more

How many Frequency Hopping Modes in GSM

The requirement that the BCCH TRX must transmit continuously in all the time slots sets strict limitations on how the frequency hopping can be realized in a cell. The current solutions are Baseband Frequency Hopping (BB FH) and Synthesized Frequency Hopping (RF FH). In the baseband frequency hopping the TRXs operates at fixed frequencies. Frequency … Read more