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Overview of NIST IEEE 802.16 implementation in NS-2. High Speed Network Technology Group. Physical layer. Implement Orthogonal Frequency Division Multiplexing Configurable parameters are: Transmission power Cyclic Prefix Frequency Frequency bandwidth

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Overview of NIST IEEE 802.16 implementation in NS-2

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Overview of nist ieee 802 16 implementation in ns 2 l.jpg

Overview of NIST IEEE 802.16 implementation in NS-2

High Speed Network Technology Group

Information Technology Laboratory, Advance Network Technologies Division


Physical layer l.jpg

Physical layer

  • Implement Orthogonal Frequency Division Multiplexing

  • Configurable parameters are:

    • Transmission power

    • Cyclic Prefix

    • Frequency

    • Frequency bandwidth

    • Modulation (BPSK, QPSK, 16QAM, and 64QAM)

  • Computed values:

    • Sampling frequency

    • OFDM symbol time duration

    • Transmission time for a packet according to its size and the modulation used

    • Maximum packet size for a given modulation and number of available OFDM symbols

Information Technology Laboratory, Advance Network Technologies Division


Mac layer l.jpg

MAC layer

  • Time Division Duplexing (TDD)

  • Management messages for network entry:

    • DCD/UCD, DL_MAP/UL_MAP

    • Ranging request/response

    • Registration request/response

  • Flow management: currently add one downlink and one uplink data connection per SS.

  • Extensible scheduler (currently Best Effort+Round Robin)

  • Fragmentation/Reassembly of packets

  • Mobility Extension (802.16e):

    • Neighbor advertisements

    • Scanning and handover

  • IEEE 802.21 ready (trigger configuration and generation)

Information Technology Laboratory, Advance Network Technologies Division


Mac layer configuration l.jpg

MAC layer configuration

  • Frame duration

  • DCD/UCD interval

  • Burst modulation

  • Channel

  • Contention size

  • Scanning attributes (number of iterations, duration)

  • Frequency of neighbor advertisements

  • Statistics (used for trigger generation)

    • Loss

    • Delay

    • Jitter

    • throughput

Information Technology Laboratory, Advance Network Technologies Division


Future work and missing features l.jpg

Future work and missing features

  • Future improvements:

    • WirelessMAN-OFDMA physical layer

    • ARQ (Automatic Repeat Request)

    • Service Flow and QoS scheduling

    • Periodic ranging and power adjustments

  • Other missing features:

    • ATM convergence sublayer

    • Mesh networks

    • WirelessMAN-SC, WirelessMAN-SCa, WirelessHUMAN physical layers

    • Frequency Division duplexing (FDD)

    • Authentication

Information Technology Laboratory, Advance Network Technologies Division


Implementation overview l.jpg

Upper layer protocols

Outgoing packet

Classifiers

Outgoing queues with

fragmentation per CID

DSx frames

Service Flow Handler

Synchronization

Messages

Service flows

Scheduler

STA: process synchronization messages from BS. Schedule uplink traffic.

BS: generate synchronization messages and schedule downlink traffic. Also perform admission control.

DSx frames

Synchronization

Messages

Controls

frame

transmission

Frame reassembly

OFDM Physical layer

Incoming packet

Implementation overview

Information Technology Laboratory, Advance Network Technologies Division


High level state machines l.jpg

High level state machines

Base Station

Mobile Station

Information Technology Laboratory, Advance Network Technologies Division


Network entry l.jpg

Network entry

MN

BS

Channel Scanning

Downlink synchronization

DL_MAP (Downlink map)

Link Detected

DCD (Downlink Channel Descriptor)

UCD (Uplink Channel Descriptor)

Uplink synchronization

UL_MAP (Uplink map)

Ranging request

Initial ranging

Ranging response

Registration request

Registration

Registration response

Link UP

Establish uplink and downlink data connections

Normal operations (data Tx/Rx and maintain synchronization)

Information Technology Laboratory, Advance Network Technologies Division


Handover in 802 16e link down l.jpg

Handover in 802.16e (Link Down)

MN

Serving BS

Target BS

Normal operations

Link down detection

Link Down

Channel scanning

DL_MAP

Link Detected

Synchronization messages (DCD, UCD, UL_MAP)

Ranging

Registration

Link UP

Layer 3 handover

Normal operations

Information Technology Laboratory, Advance Network Technologies Division


Handover in 802 16e link going down l.jpg

Handover in 802.16e (Link Going Down)

MN

Serving BS

Target BS

Normal operations

Link Going Down

MOB-SCN_REQ

MOB-SCN_RSP

Channel scanning

Repeat scanning

and normal mode intervals

Scanning

Synchronization messages (DL_MAP,DCD, UCD, UL_MAP)

Normal mode

MOB-SCN_REP

MOB-MSHO_REQ

MOB-MSHO_RSP

Link Handoff Imminent

MOB-MSHO_IND

Link Handoff Proceeding

Switch channel

Synchronization messages (DL_MAP,DCD, UCD, UL_MAP)

Full or Partial network entry

Ranging and Registration

Link Handoff Complete

Layer 3 handover

Normal operations

Information Technology Laboratory, Advance Network Technologies Division


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