Notes - MIECT
Comunicações Móveis
Notes - MIECT
Comunicações Móveis
  • Comunicações Móveis
  • The Communication Network
    • The Phone Network
    • The Internet
    • The Mobile Network
  • Wireless Systems
    • Wireless Systems
    • Mobile Hassles
    • Device Issues
    • Why is mobile hard?
  • Physical Layer
    • Classifications of Transmission Media
    • Wireless
    • Radio Transmission Impairments
    • Time-Domain View
    • Propagation Degrades
    • Propagation Mechanisms
    • Redundancy
  • Satellite Networks
    • Satellites
    • Satellite Networks
      • GEO - Geostationary Orbit
      • NGSO - Non Geostationary Orbits
    • Routing
  • Mobile Networks
    • Connections and structures
    • Cell
    • Wireless networks
    • 802.11
    • Infrastructure vs Ad Hoc Mode
    • Data Flow Examples
    • Physical layer
    • MAC
      • Multi-bit Rate
      • MAC Layer
      • Carrier Sense Multiple Access
      • Some More MAC Features
    • How does a station connect to an Access Point?
      • IEEE 802.11 Mobility
    • How to extend range in Wi- Fi?
      • IEEE 1905.1 standard, Convergent Digital Home Network for Heterogeneous Technologies
  • Bluetooth, Wireless Sensor Networks, ZigBee
    • Bluetooth
      • Piconets
        • Device Discovery Illustrated
        • Paging
      • Scatternet
      • Bluetooth Stack
        • Baseband in Bluetooth
        • Adaptation protocols
      • Profiles and security
        • Bluetooth
        • Link keys in a piconet
      • 802.15.x
        • Bluetooth Networking Encapsulation Protocol
        • Bluetooth 4.0: Low Energy
          • Device Modes
          • Link Layer Connection
          • How low can the energy get?
          • BLE and GAP
    • Wireless Sensor Networks
      • MIoT and HIoT are different
      • Types of Wireless Networks
      • Wireless Sensor Network
      • 802.15.4 and Zigbee
      • 802.15.4 / ZigBee Architecture
        • IEEE 802.15.4 MAC
        • Channel Access Mechanism
        • Association procedures
        • ZigBee
        • ZigBee and BLE
  • Cellular Networks
    • Wireless cellular network
    • Wide Area Wireless Sensor Networks (WWSN)
      • LTE-M
      • NB-IoT
      • Spectrum & Access
      • Cellular technologies
      • LoRa
      • The Things Network
    • Technological waves
    • 1G - Mobile voice
    • 2G - Global System for Mobile Communications (GSM)
    • 2.5G - General Packet Radio Service (GPRS)
    • 3G - Universal Mobile Telecommunication System
      • Multiplexing mechanisms
      • SIP Protocol
      • Services in IMS
    • 4G - Long Term Evolution/Evolved Packet Core (LTE/EPC)
      • Long Term Evolution (LTE)
    • 5G
      • Example of verticals
      • 3GPP Releases detail
      • Technologies
      • New Radio is required
      • System architecture
      • Non-stand Alone (NSA)
      • Networks deployment
      • Protocol stacks
      • Procedures
      • QoS Model
      • Mobility in 5G
      • Distributed cloud: Edge Computing and 5G
      • Slicing
    • 6G
  • Software and Virtualization Technologies in Mobile Communication Networks
    • Network Function Virtualization
    • Management and Orchestration
    • Software Defined Networking
      • How to “direct” the controller?
      • Emulation
      • Programming Protocol-Independent Packet Processors (P4)
    • OpenRAN
    • Multi-access Edge Computing
    • Network Automation
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  • Defined in IETF RFC 3261.
  • SIP is to the Internet what SS#7 is to telephony.
  • In IMS, SIP is extended to include extra functionality.
  • At the core of IMS there are several SIP proxies:
  • Serving - CSCF.
  • Proxy – CSCF
  1. Cellular Networks
  2. 3G - Universal Mobile Telecommunication System

SIP Protocol

Defined in IETF RFC 3261.

“... an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences.”

SIP is to the Internet what SS#7 is to telephony.

In IMS, SIP is extended to include extra functionality.

  • E.g. 3GPP TS 23.228.

At the core of IMS there are several SIP proxies:

  • I-CSCF, S-CSCF, P-CSCF.

  • The Call Session Control function (CSCF) is the heart of the IMS architecture.

  • The main functions of the CSCF:

    • provide session control for terminals and applications using the IMS network,

    • secure routing of the SIP messages,

    • subsequent monitoring of the SIP sessions and communicating with the policy architecture to support media authorization,

    • responsibility for interacting with the HSS.

Serving - CSCF.

  • Controls the user’s SIP Session.

  • very few per domain.

  • Located in the home domain.

  • Is a SIP registrar (and proxy).

Proxy – CSCF

  • IMS contact point for the user’s SIP signaling.

  • Several in a domain.

  • Located in the visited domain.

  • Terminals must know this proxy (e.g. DHCP used).

  • Compresses and decompresses SIP messages.

  • Secures SIP messages.

  • Assures correctness of SIP messages.

Interrogating – CSCF

  • domain’s contact point for inter- domain SIP signaling.

  • one or more per domain.

  • In case there are more than one S- CSCFs in the domain, locates which S-CSCF is serving a user.

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Last updated 2 years ago