NB-IoT

Comments

  1. NB IoT23 June 2019 at 22:25

    Nice blog... NB IoT on a licensed spectrum means improved reliability for users as well as the guaranteed resource allocation needed for managed QoS.

    ReplyDelete

Post a Comment

Popular posts from this blog

5G Deployment Option-3/3a/3x

Image
Home                 LTE                NB-IoT            5G(NR-NSA)   Hi Guys today we are learning about 5G deployment options, if you want to know more about other 5G deployment option please  click here Option 3: EN-DC (EUTRA-NR Dual Connectivity) Option 3 represents a network having both LTE and NR radio access, but using only the EPC core of LTE to route the Control signals. In this option, LTE is used as the control plane anchor for NR, and both LTE and NR are used for user data traffic.(user plane). It could also be called as Non-Standalone (NSA) NR in Evolved Packet System. The only difference between Options 3 and 3A is based on whether the user plane data is sent to NR directly or via the LTE RAN. This standardization was concluded in 3GPP Rel-15. This is a possible first step in the migration towards 5G-SA. This option wi...
Read more

Authentication in LTE

Home                 LTE                NB-IoT            5G(NR-NSA)   What is Authentication and what type of Authentication is used in LTE? Authentication is a process by which both the UE and Network check whether the other party is authorized to communicate with them. In LTE and WCDMA, a mutual authentication process is used i.e. the Network checks whether the UE is authorized to camp on it and the UE also checks whether it is trying to camp on is the correct Network. The UE becomes authorized to camp on a network by subscribing to the network. In LTE, EPS AKA i.e. Authentication Key Agreement procedure is used for Mutual Authentication. Why is Authentication required from both sides in LTE? The UE needs to be authenticated by the NW to check whether it has subscribed to the NW or not. Only UEs which have a valid subscription shou...
Read more

DRX (Discontinuous Reception)

Image
Home                 LTE                NB-IoT            5G(NR-NSA)   What is DRX and DRX active period? What channels does it monitor in active period? Data transmission between UE and their base stations(eNodeB) uses radio frames with10ms duration, where in each radio frame consists of 10 1ms( 1 frame=10ms duration=10 subframe) subframes. Physical Downlink Control Channel (PDCCH) at the beginning of each subframe indicates whether there is data for UE to receive or not. Devices has to monitor these PDCCHs in each subframe so that it can find out whether they carry any data to receive. Because devices do not receive data in every subframe, this monitoring process naturally leads to high battery consumption.  What is the purpose of DRX? The main purpose of DRX is to lower battery consumption when there is no UL/DL...
Read more

Control Plane CIoT EPS optimization

Image
Home                 LTE                NB-IoT            5G(NR-NSA) Hi Guys today we are learning about  Control Plane CIoT EPS optimization  in detail for NB-IoT, For more update Please visit our NB-IoT page . Control Plane CIoT EPS optimization: In order to reduce the total number of control plane messages when handling a short data transaction, user data or SMS messages is conveyed to the IOT services via MME by encapsulating them in NAS messages. There are two paths through which, user data or SMS can be transmitted on the Control Plane CIoT EPS optimization: UL data are transferred from the eNB (CIoT RAN) >> the MME >> the Serving Gateway (SGW) >> the Packet Data Network Gateway (PGW) >> IOT Services UL data are transferred from the eNB (CIoT RAN) >> the MME >> the Service Capability Exposu...
Read more

PRACH Basic-3

Image
Home                 LTE                NB-IoT               5G(NR-NSA) In this section we will learn about PRACH Preamble Format and its basics as well as interview questions. Random access with NR supports different PRACH formats and numerologies to cope up with different deployments. The random access sequences themselves are based on the preamble format. Preamble Format: (Qus: How many new preamble format are introduce by 3gpp in NSA or SA case?) In 5G NSA or SA cases, there are 13 types of preamble format for FR1/FR2 and they are known as Format 0/1/2/3, Format A1/A2/A3, Format B1/B2/B3/B4, Format C0/C2. These 13 types of preamble format can be categorized into two categories: • Sequence length of L = 139, with subcarrier spacing of 15, 30, 60, and 120 kHz. These can be solutions for different coverage situations. • Sequence length of L ...
Read more

cell selection part-2

Home                 LTE                NB-IoT               5G(NR-NSA) In this section, we will learn about cell selection criteria for SA and LTE. How is cell selection criteria defined? The cell selection criterion which is abbreviated as S in normal coverage is fulfilled when: Srxlev > 0 AND Squal > 0 Where: Srxlev = Qrxlevmeas – (Qrxlevmin + Qrxlevminoffset) – Pcompensation - Qoffsettemp Squal = Qqualmeas – (Qqualmin + Qqualminoffset) - Qoffsettemp Where: Srxlev Cell selection RX level value (dB) Squal Cell selection quality value (dB) Qoffsettemp Offset temporarily applied to a cell (dB) Qrxlevmeas Measured cell RX level value (RSRP) Qqualmeas Measured cell quality value (RSRQ) Qrxlevmin Minimum required RX level in the cell (dBm). If the UE supports SUL...
Read more

HARQ Basic Part-1

Home                 LTE                NB-IoT               5G(NR-NSA) In this section, we will learn about HARQ basic.  What is ARQ? ARQ stands for automatic repeat request. It refers to the re-transmission protocol in which the receiver checks for errors within the received data and if an error is detected then the receiver discards the data and request a re-transmission forms the sender. For acknowledged mode the RLC layer uses an ARQ protocol.   What is HARQ? HARQ stands for hybrid ARQ. It refers to a re-transmission protocol in which the receiver checks for errors in the received data and if an error is detected then the receiver buffers (soft buffers) the data and requests a retransmission from sender. HARQ receiver then is able to combine the buffered data with the re-transmitted data to channel decoding and error detection. This...
Read more