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Articles

 

Cafetele telecom training  team is here to update you with important topics. if you have any question about other topics, please send us your massage. We will be happy to hear from you.

 

5G

5G NR Antenna Port

What is Antenna Port? An antenna port is in the 3GPP specifications an abstract concept that is a logical entity rather than a physical antenna. Each antenna port is associated with a specific set of reference signals such that the channel over which a symbol is transmitted on that antenna

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4G

VOLTE SIP Message

First we have to understand what is SIP ?  In an IMS network, Session Initiation Protocol (SIP) messages are exchanged between UEs using signaling PDP contexts through the PS domain of the LTEnetwork. Similarly, media streams (voice/video) are transmitted using media PDP contexts. Like common interactive PDP contexts, media PDP

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VOLTE Architecture
4G

VOLTE Architecture

VOLTE: VOICE OVER LTE VoIP call support over an LTE network requires IMS support. When a UE with an active VoIP call leaves LTE coverage to an area with only 1xRTT coverage, the call can be seamlessly handed over from the LTE-IMS to the 1xRTT CS domain. Call continuity from

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5G

PSS,SSS,PBCH Overview

SS/PBCH Time domain Resource Allocation SSB Burst set : All SSBs are transmitted within 5 ms. Maxmimum SSB in Cell is depend upon frequency. Less than 3 GHz band  maximum SSB is 4 3 GHz to 6 GHz maximum SSB is 8 greater than 6 GHz maximum SSB is 64.

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5G NR

5G NR Random Access

Random Access: Random access required to do uplink synchronization between UE and eNB and gNB. There are 2 types of Random Access Procedure in 5G Network. Contention Based Random Access Contention Based Random access has four-step MSG1 ( UE to gNB or MN-eNB) MSG2 ( gNB to UE) Msg3 (UE

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5G

5G NR – Primary Synchronization Signal(PSS)

Main pillar of the NR is a Synchronization Signal and PBCH block (SS/PBCH block). SSB Block contains PSS 2 SSS PBCH In this article , I am going to discuss about PSS. Lets see the PCI formula below. Lets first understand LTE PSS location in sub frame. For FDD frame,

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5G

5G Main Abbreviations

3GPP 3rd generation partnership program5G-GUTI 5G globally unique temporary identity5G-AN 5G access network5GC 5G core network5GMM 5G mobility management5GSM 5G session management5GTF 5G technical Forum5QI 5G QoS identifier AAA Authentication, authorization and acountingACK AcknowledgementAKA Authentication and key agreementAM Acknowledged modeAMBR Aggregate maximum bit rateAMC Adaptive modulation and codingAMD Acknowledge mode

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5G

5G NR CORE Architecture

With the rapid development of mobile Internet and Internet of Things(IoT), Telecom services have been increasingly multifarious. The three main usage scenarios for 5G, namely1. enhanced Mobile Broadband(eMBB) 2. massive Machine Type of Communication(mMTC) 3. ultra-Reliable Low Latency Communication(uRLLC), However, in terms of performance, the current 4G system cannot meet

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5G

5G Measurement

•The basic idea on RSRP/RSRQ in NR is also similar to LTE RSRP/RSRQ •In LTE, RSRP and RSRQ are based on Cell-specific Reference Signal (CRS). However, in NR there is no CRS •RSRP / RSRQ definition in NR is based on other physical signals as shown in the following table.

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5G

5G NR Data Rate (Throughput)

Date Rate Throughput defined in 3GPP 38.306(4.1.2) The DL and UL max data rate supported by the UE is calculated by band or band combinations supported by the UE. AUE supporting NR (NR SA, MR-DC) shall support the calculated DL and UL max data rate defined. In NR Data rate

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5G

5G NR System Information Block1

SIB1 contains information relevant when evaluating if a UE is allowed to access a cell and defines the scheduling of other system information. It also contains radio resource configuration information that is common for all UEs and barring information applied to the unified access control. Signalling radio bearer: N/ARLC-SAP: TMLogical

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4G

LTE Architecture

LTE Architecture : LTE network can be considered of two main components: RAN and EPC RAN: Ran includes LTE radio protocol stacks ( RLC, PDCP, RLC, MAC, Physical) when they are connected to EPC core. LTE Radio Protocol stacks new ( SDAP, PDCP, RLC, MAC, Physical, RRC) when they are

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