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next generation networks


next generation networks chapter in Talukder – PowerPoint PPT presentation

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Title: next generation networks

Next Generation Networks
Next generation networks (NGN)
  • In NGN all traffic will be packet based and
    through IP, subsequently with next generation
  • Offers seamless roaming
  • NGN is about convergence all technologies of
    the past and the future
  • NGN can be thought of as an object oriented
    networks where objects are various services.

All in one the converged scenario
  • Convergence of voice and data
  • Convergence of wire and wireless
  • Convergence of circuit switching and packet
  • Convergence of IT and CT
  • Convergence of OSS and BSS

Narrowband to broadband
  • DSL broadband networks
  • WiMAX broadband wireless networks
  • High speed broadband cellular networks
  • WiBro

DSL broadband networks
  • Provides the data service over the wires of
    telephone networks
  • Can be ADSL or SDSL
  • Voice and data connection can be operate
  • Download speed of consumer DSL service ranges
    from 256 kbps to 24000 kbps
  • HDSL ( high bit rate DSL) offers much higher

2. WiMAX broadband wireless networks
  • WiMAX can be either fixed or mobile
  • In fixed WiMAX, do not provide handoff between BS
    so the service providers do not offer mobility
  • Mobile WiMAX offers handoffs
  • With line-of-sights environment with portable
    WiMAX device, bandwidth can be expected around
    10Mbit/s over 10 km radius.

3. High speed broadband cellular networks
  • High Speed Packet Access (HSPA) is a suit of
    mobile telephony protocols that aim to extends
    and improve the performance of existing UMTS.
  • Two protocols of HSPA
  • High speed Uplink Packet Access (HSUPA)
  • Provides speed of up to 5.76 Mbits/s
  • Uses enhance dedicated channels and faster link
    adaptation methods
  • High speed Downlink Uplink Packet Access (HSDPA)
  • Provides downlink speeds of 1.8, 3.6, 7.2 and
    14.4 Mbit/s
  • And uplink speeds to a max of 384 kbit/s
  • Improves downlink performance using faster
    scheduling of packets and quick retransmission
    and adaptive modulation and coding (AMC)

4. WiBro
  • Wireless broadband is south Korean name for IEEE
    802.16e(mobile WiMAX)
  • Base stations offers aggregate data throughput
    from 30 to 50 Mbit/s
  • Provides mobility for moving devices up to 120
    Km/h compared to WLAN which provides the mobility
    up to walking speed

All IP and B3G networks
  • NGN is also called as beyond 3G.
  • B3G concepts and idea includes following
  • Transition towards an IP based network
  • Support of heterogeneous technologies.
  • Seamless handover
  • Mobility management
  • QoS support on the IP layer
  • Use of policy-based mechanisms in order to
    determine QoS, accounting and billing
  • Network access control of mobile users (i.e.
    deployment of AAA protocols)

All IP and B3G networks cont
  • Secure access to multimedia services across
    different networks
  • Access to multimedia services in hybrid IPv4/IPv6
  • It will offer RASP that includes reliability,
    availibility, security and performance
  • More users per cellular cell
  • A highly efficient spectral system
  • Backward compatibility with existing wireless

  • To allow higher spectral utilization OFDM is
    increasing being used.
  • Some services that use OFDM today are DSL,
  • Based on principle of spreading data over large
    number of carriers
  • Advantages
  • High spectral efficiency
  • Facilitation of transmitter micro diversity
  • Robustness against ISI(Inter symbol
    interference). Interference on a given frequency
    only affect small umber of carriers
  • Nullls caused multi-path effects
  • Good error coding
  • Transceiver system must be orthogonal

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OFDM cont
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  • In order to resolve medium access control issues,
    the FAMA protocol was proposed
  • It characterized by the assignment of capacity in
    fixed manner among multiple channels
  • FAMA can be in different flavours TDMA, FDMA,
    CDMA and DSMA
  • Have some potential drawbacks.
  • Improvement over FAMA is DAMA protocols have
    capacity assignment in a manner that optimally
    responds to demands from/amongst multiple
  • Assign channels based on traffic information
  • Assignment of channels achieved through
    reservation or polling techniques

  • Smarter routing is essential for traffic
    engineering and efficient routing of packets in a
    converged network, MPLS does exactly this.
  • MPLS lie between layer 2 and 3
  • Make use of labels for data forwarding
  • Provides a unified data carriage service
  • Runs over any link layer technology
  • Scalable enough to support internet growth and
    current IP network operations
  • Major applications
  • Traffic engineering
  • Class of service(CoS)
  • VPNs

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  • What is MPLS?
  • MPLS stands for Multi Protocol Label Switching.
  • The MPLS serves as a method to forward packets of
    data easily by using labels.
  • Multiprotocol Label Switching (MPLS) is a
    vendor-independent protocol that applies labels
    to packets providing QOS and advance route
    selection functions.
  • MPLS can be implemented over any media-type and
    can be used with point-to-point, multipoint and
    ATM links. MPLS can be used with different
    network layer protocols (hence the term
    multiprotocol) by using a control component
    specific to the desired protocol.
  • MPLS can speed up the flow of network traffic and
    make it easier to manage.
  • MPLS is flexible, fast, cost-efficient and allows
    for network segmentation and quality of service
  • MPLS also offers a better way of transporting
    latency-sensitive applications like voice and

Wireless ATM
  • Mobility is incorporated in WATM by keeping the
    following as mandatory
  • ATM cell is a basic unit in both wireless and
  • Standard ATM services at transport layer
  • Custom medium access and data link control for
    wireless segment
  • Mobility extensions to ATM signalling handoff
    and location management

An illustration of wireless base stations
connected through an ATM switch
Wireless ATM
  • Service scenarios for WATM
  • Providing mobility supports in IP
  • ATM connection to appears as a tunnel to IP
  • Mobility of tunnel endpoints
  • Mobile telephony
  • ATM base station terminated GSM radio protocol
  • Translates GSM call setup to UNI signling
  • Bridging GSM air interface and ATM dial path
  • Wireless ATM systems
  • End-to-end ATM connection to mobile end points
  • Broadband wireless access to the tune of 25 Mbps

  • Wireless ATM,17 or Mobile ATM, consists of an
    ATM core network with a wireless access network.
    ATM cells are transmitted from base stations to
    mobile terminals. Mobility functions are
    performed at an ATM switch in the core network,
    known as "crossover switch",18 which is similar
    to the MSC (mobile switching center) of GSM
    Networks. The advantage of Wireless ATM is its
    high bandwidth and high speed handoffs done at
    Layer 2. Mobile ATM aimed to provide high speed
    multimedia communications technology, capable of
    delivering broadband mobile communications beyond
    that of GSM and WLANs
  • WATM is nowbeing actively considered as a
    potential framework for next-generation wieless
    communicationt ionnetworks capable of supporting
    integrated, quality of-service (QoS)
    basedmultimedia services

Multimedia broadcast services
  • DAB
  • DVB
  • IPTV
  • Internet TV

Multiple play
  • Triple play
  • Quadruple play

Future trends
  • 3GPP long term evolution
  • iBurst