Once the data has been scrambled with the user specific long code, the closed loop power control data is then punctured into the data stream. Remember that the power control bits are sent every 1.25 milli-seconds – once in every power control group (a CDMA frame is 20 milli-seconds with each frame having 16 1.25 … Read more
CDMA means all depedancy on power control here i write on Power Control Inaccuracy in cdma. Traffic capacity of CDMA systems is increased by implementing an appropriate power control scheme to equalize the performance of all subscribers in the system. The appropriate power control scheme reduces the interference to the other adjacent cells. The less … Read more
The user then decides to make a call. The number is keyed in and the send key is hit. This initiates an Access Probe. The mobile uses a special code channel called the Access Channel to make contact with the cell site. CDMA mobiles can transmit two types of channels on the single physical channel … Read more
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
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
Effect in Cell Coverage Area In coverage limited cells the frequency hopping may increase the cell coverage area because of the frequency diversity gain, but since the BCCH time slot doesn’t hop, the increased coverage area is relevant only for the ongoing calls that have been successfully established and are allocated a hopping TCH. According … Read more
The Mobile Equipment and SIM are the only parts of the GSM network which the subscriber will really see. Let’s see what inside it. GSM Mobile Equipment There are three main types of ME, these are listed below: Vehicle Mounted These devices are mounted in a vehicle and the antenna is physically mounted on the … Read more
Orthogonal frequency division multiple access (OFDMA): Mobile WiMAX uses OFDM as a multiple-access technique, whereby different users can be allocated different subsets of the OFDM tones. As discussed in detail in Chapter 6, OFDMA facilitates the exploitation of frequency diversity and multiuser diversity to significantly improve the system capacity. Flexible and dynamic per user resource … Read more
Here I write not all but important List of EUTRAN Capacity Limiting Factors for LTE and its definition. Impact of Interference on Capacity Interference is always a main contributor to capacity degradation in 1G to 3G cellular network and LTE is no difference. Besides external interference, there is a strong relationship also between the number … Read more
Here I write down about How to UE Distribution and Channel Model : Pedestrian vs High Mobility, TDD Specific Uplink and Downlink Configuration and Power Boosting Configuration selection during initial planning of LTE Network and why it needs to take care by radio engineer during LTE network plan. UE Distribution and Channel Model: Pedestrian vs … Read more