4g LTE: LTE HARQ
HARQ stands for Hybrid Automatic Repeat Request (HARQ). This is a physical layer functionality in LTE. ARQ: Automatic Repeat Request. It…
4g LTE: LTE Frame Structure
LTE Physical Layer 2 radio frames are supported: 1. Type 1: FDD : Frequency Division Duplex 2. Type 2: TDD : Time Division Duplex For multiple…
4g LTE: LTE control Plane protocol Stack
In the last chapter we learn about LTE User Plane Protocol stack, in this chapter we shall see LTE Control Plane Protocol Stack. Below 2…
4g LTE: LTE user plane protocol stack
In LTE, depending upon User plane or Control Plane, the protocol stack has been divided into 2 different types. 1. LTE User Plane Protocol…
4g LTE: LTE Security
LTE security is an very important topic. In LTE we have 3 key pillars of security. They are 1. Authentication 2. Integrity 3. Encryption. 1.…
4g LTE: The AIR interface protocol stack
Below diagram shows the architecture of AIR interface: The above image shows the protocols used in the air interface with User Equipment…
4g LTE: Bearers in LTE
Bearer means a “carrier”, which carries something form one point to another. LTE provides end to end service using multiple LTE…
4g LTE: LTE Interfaces
In this chapter we shall see what are the different interfaces available in LTE. First, what is an interface? Interface is a channel that is…
4g LTE: Identifiers in LTE
IMSI IMSI stands for International Mobile Subscriber Identity. IMSI is used to identify globally unique SIM or USIM card. It is comprised of 3…
4g LTE: Introduction to EPC network architecture elements
EPC will be having below elements: MME : Mobility Management Entity S-GW : ServingGateway P-GW : PDNGateway HSS : HomeSubscriberServer PCRF :…