Physical Channel Types of LTE The physical layer uses resource blocks to transmit binary coded information in QPKS, 16QAM or 64QAM or OOK modulation form. Physical channels determine how data is processed and then mapped via dynamical scheduling onto resource blocks. Thus physical channels also in EUTRAN represent the available physical resources. Like transport channels, … Read more
Basic Function of Uplink & Downlink Transport Channel in LTE Uplink Transport Channel: Purpose: Facilitates the transmission of user data from the User Equipment (UE) to the eNodeB (base station). Channels: Includes the Physical Uplink Shared Channel (PUSCH) for user data and the Physical Uplink Control Channel (PUCCH) for control information. Data Transmission: Carries information … Read more
How 26 and 51 Multiframes in GSM GSM is very complicated when we talk about its rf side and in it very complicated to understand the structure of 26 and 51 Multiframes, here my try to make you understand simply. The 26-frame Traffic Channel Multiframe in GSM The Below Figure shows the time relationship between … Read more
What is Burst in GSM and Burst Types in GSM The Below a GSM burst. It consists of several different elements. These elements are as below: This is the area in which the speech, data or control information is held. Side effects Guard Period The BTS and MS can only receive the burst and decode … Read more
What is BSIC and its use in GSM BSIC=NCC+BCC In GSM system, each BTS is allocated with a color code, which is called BSIC. MS can identify two cells with the same BCCH by the help of BSIC. In network planning, effort should be made to make sure that BCCH of neighbor cells are different … Read more
What is Use of LAC in GSM Location Area Code（LAC) : To locate the location of MS, the whole area covered by each GSM PLMN is divided into different location areas. LAC is used to identify different location areas. LAI contains LAC, which is composed of two bytes. LAC adopts hexadecimal coding. The available range … Read more
Why and How BSIC Planning in GSM Why BSIC Planning in GSM ? Because when tight frequency planning required or we have very limited frequency to plan then to reduce Mobile confusion about cell id BSIC used to identify cell id after BCCH. lets understand How BSIC Planning in GSM? In addition to the assignment of frequency … Read more
GSM Underlaid Overlaid Frequency Allocation and Configuration Underlaid Overlaid Frequency Allocation In the Overlaid/Underlaid technology, all frequency carriers in the cell are divided into two parts, of which the TRX power of some frequency carriers is lowered, then two Overlaid/Underlaid with different coverage appear, as shown in the below figure. The frequency carriers used by … Read more
BCH,CCCH and DCCH Channel of GSM BCH (Broadcast Channels) BCCH(Broadcast Control Channels) Downlink Only. Broadcast information of the serving cell (System Information). Transmitted on timeslot zero of BCCH carrier. Read only by idle mobile at least once every 30 secs. SCH (Synchronization Channels) Downlink Only Carries information for frame synchronization. Contains frame number and BSIC … Read more
The SIM card contains its internal memory, in which the data, personal and financial information as well as the identity for GSM / CDMA are stored. The SIM card stores network-specific information in order to authenticate the identity of the subscriber in the network. SIMs were first launched in 1992 with the first digital “GSM” … Read more