In this chapter we shall see SIP Registration and SIP Invite call flow. SIP REGISTRATION Call flow: User1 SIP Server | | | REGISTER M1 | |------------------------------>| | 401 Unauthorized M2 | |<------------------------------| | REGISTER M3 | |------------------------------>| | 200 OK M4 | |<------------------------------| | …
Basic Registration call flow is as shown in image below: Below image shows the sequence of steps followed for Registration process: First step involves in UE attaching to LTE Network. Once UE is attached to LTE network, UE needs to register with SIP server to make …
VoLTE Introduction 1. VoLTE stands for Voice Over LTE. 2. Until VoLTE was launched, all the calls made from LTE network used to go to Circuit Switched Network. 3. VoLTE was launched after LTE was launched. 4. As 4G is fully PS service, to make calls …
ARQ procedure is performed by RCL AM entity. This is initiated when the transmitting side RLC entity starts the polling procedure. Polling procedure will trigger STATUS reporting from receiving side AM RLC entity. For ARQ procedure, we need to concentrate on 3 topics: 1. Retransmission 2. …
It will preform segmentation, reassembly, retransmission of RLC SDU. RLC Headers are added and removed. It will guarantees delivery of RLC PDU. Note: In RLC AM mode, it will receive/sends AMD PDU or AMD PDU segment. This is RLC data PDU. In RLC AM mode, it …