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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

User Plane Protocol 5G

The 5G NR radio access network is comprised of these protocol entities: Service data adaptation protocol (SDAP) Packet data convergence protocol (PDCP) Radio link control (RLC) Medium access control (MAC) Physical layer (PHY)

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Signalling radio bearers
5G

Signalling Radio Bearers in details

* Signalling radio bearers Signalling Radio Bearers” (SRBs) define as Radio Bearers (RBs) that can be used only for the transmission of RRC and NAS messages.

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5G

Key performance indicators

From IMT Advanced to IMT 2020 Performance measure Requirement Peak data rate DL: [20 Gbps] UL: [10 Gbps] Peak spectral efficiency DL: [30 bps/Hz] UL: [15 bps/Hz] Spectrum Scalability Yes Bandwidth Reference to IMT-2020 Bandwidth Scalability Yes Control plane latency [10 ms] UP latency URLLC, one-way [0,5 ms] UP latency

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5G

RRC Radio Resource Control Protocol

Services and Functions The main services and functions of the RRC Broadcast of System Information related to AS and NAS. Paging initiated by 5GC or NG-RAN Establishment, maintenance, and release of an RRC connection between the UE and NG-RAN including( Addition, modification, and release of carrier aggregation) & Addition, modification,

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5G

Dual Connectivity architecture options(MR-DC)

Multi-Radio Dual Connectivity: Multi-Radio Dual Connectivity (MR-DC) is a generalization of the Intra-E-UTRA Dual Connectivity (DC) described in TS 36.300 [2], where a multiple Rx/Tx capable UE may be configured to utilize resources provided by two different nodes connected via non-ideal backhaul, one providing NR access and the other one

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5G

Reference signal LTE VS NR

REFERENCE SIGNAL USE IN NETWORK LTE 5G-NR DL Channel State Information CRS, CSI-RS CSI-RS UL Channel State Information SRS SRS Data Channel Modulation CRS,DMRS DMRS Control Channel Demodulation CRS DMRS Phase tracking   PTRS Time and Frequency Tracking CRS TRS Beam Management   SSB,CSI-RS Radio Link Monitoring CRS CSI-RS,SSB RRM

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5G Protocols
5G

5G-NR Protocols

Radio Protocol Architecture The 5G NR radio access network is comprised of these protocol entities: Service data adaptation protocol (SDAP) Packet data convergence protocol (PDCP) Radio link control (RLC) Medium access control (MAC) Physical layer (PHY) To meet the desired key capabilities of 5G NR, the other layers of the

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5G

5G NR Frame Structure

Frame Structure 5G-NR In NR, similar to LTE, a radio frame is fixed to be 10 ms, which consists of 10 subframes each of 1ms. However, different from LTE which has a fixed subcarrier spacing (SCS) for 15 kHz, NR supports scalable numerology for more flexible deployments covering a wide

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5G-NR
5G

5GS Connection Management states

5GS Connection Management states Two CM states are used to reflect the NAS signaling Connection of the UE with the AMF: CM-IDLE CM-CONNECTED CM-IDLE state A UE in CM-IDLE state has no NAS signalling connection established with the AMF over N1. The UE performs cell selection/cell reselection according to TS 38.304 [50]

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5G-NR
5G

5G Registration Management

A UE/user needs to register with the network to receive services that requires registration. 5GS Registration Management states Two RM states are used in the UE and the AMF that reflect the registration status of the UE in the selected PLMN. RM-DEREGISTERED. RM-REGISTERED RM-DEREGISTERED state In the RM‑DEREGISTERED state, the

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5G NR
5G

5G-NR Network Function

The 5G System architecture consists of the following network functions (NF). Service-based interfaces: This Service based interface is connected to each interface. The 5G System Architecture contains the following service-based interfaces: SBI Interface   Namf    Service-based interface exhibited by AMF Nsmf    Service-based interface exhibited by SMF Nnef    Service-based interface exhibited

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4G

System Information Block LTE

System Information Blocks in LTE, SIBs carry relevant information for the UE, which helps UE to access a cell, perform cell re-selection, information related to INTRA-frequency, INTER-frequency, and INTER-RAT cell selections.In LTE there are 13 types of SIBs. Each SIB has its own job to do, which means, they are

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