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CDMA Handoff Defination,Types and Capacity

CDMA Handoff Defination,Types and Capacity Handoffs The TIA/EIA Interim Standard, Mobile Station – Base Station Compatibility Standard of Dual- Mode Wideband Spread Spectrum Cellular System (TIA/EIA/IS-95), states that a CDMA base station shall support three types of handoff processes. Which type of handoff used in cdma? CDMA to CDMA Hard Handoff A CDMA to CDMA … Read more

Functions and Architecture of PDCP in LTE

PDCP layer performs the following functions: 1. Header compression and decompression plane of the user data; 2. Security features: encryption and deciphering the user plane and control plane data; the protection of the integrity and operation of the plane data; 3. Provide support functions: order to delivery and reorder PDU to the layer above a … Read more

Frequency or RAT Evaluation for LTE UE

E-UTRAN configures a priority for all applicable frequencies for each RAT. In addition to the priorities of specific cells that are optionally provided by SI, E-UTRAN can assign specific EU priorities through dedicated signaling. Since frequencies are indicated in the information system, the EU is expected to take into account only the cell reselection which … Read more

GSM RF Optimization Step by Step

Here I write about GSM RF Optimization Step by Step and how to find KPI degradation and its solution. The RF network optimization process can be categorized by the following steps: Problem analysis Analyzing performance retrieved from tool reports and statistics for the worst performing BSCs and/or Sites Viewing ARQ reports for BSC/Site performance trends … Read more

LTE Frame Structure and Resource Block Architecture

LTE Frame Structure The figure below shows the LTE frame structure under Time division mode (TDD) Type 2 and Frequency Division mode (FDD) Type 1. Differences in LTE Frame Structure Main differences in LTE Frame Structure between the two modes are Frame 0 and frame 5 (always downlink in TDD) Frame 1 and frame 6 … Read more

What is RAKE RECEIVER and its Purpose in CDMA

Rake Receiver Instead of trying to overpower or correct multipath problems, CDMA takes advantage of the multipath to improve reception quality in fading conditions. CDMA does this by using multiple correlating receivers and assigning them to the strongest signals.  This is possible because the CDMA mobile is synchronized to the serving base station. The mobile’s … Read more

LTE Architecture- SERVICE, EPC, E-UTRAN and User Equipment

lets talk about LTE Architecture- SERVICE, EPC, E-UTRAN and User Equipment. In the LTE network is divided into 2 basic networks, namely: 1. EUTRAN (Evolved Universal Terrestrial Radio Access Network) 2. EPC (Evolved Packet Core) SERVICE IP Multimedia Subsystem (IMS) is a good example of cars that can be used in the service layer connectivity Services … Read more

List of Parameters and Terms for PN Offset Planning in CDMA

There are various parameters and terms which come into play when discussing PN offsets and their function in CDMA. System Time All base station digital transmissions are referenced to a common CDMA system-wide time scale that uses the Global Positioning System (GPS) time scale, which is traceable to and synchronous with Universal Coordinated Time (UTC). … Read more

What is the Result of Incorrect PN Planning in CDMA ?

The design of a PN offset plan for CDMA is comparable to that of a signalling channel frequency plan in analog. The consequences of poor offset planning include the following: Active Set Pilot Interference – This phenomenon would occur in the active area and involve the active search window (SRCH_WIN_A). The interfering signal would need … Read more