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Information Technology Laboratory, Advance Network Technologies Division Overview of NIST IEEE 802.16 implementation in NS-2 High Speed Network Technology.

Published byClifford Burns Modified over 9 years ago

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Presentation on theme: "Information Technology Laboratory, Advance Network Technologies Division Overview of NIST IEEE 802.16 implementation in NS-2 High Speed Network Technology."— Presentation transcript:

1 Information Technology Laboratory, Advance Network Technologies Division Overview of NIST IEEE 802.16 implementation in NS-2 High Speed Network Technology Group

2 Information Technology Laboratory, Advance Network Technologies Division 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

3 Information Technology Laboratory, Advance Network Technologies Division 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)

4 Information Technology Laboratory, Advance Network Technologies Division 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

5 Information Technology Laboratory, Advance Network Technologies Division 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

6 Information Technology Laboratory, Advance Network Technologies Division Implementation overview OFDM Physical layer Upper layer protocols Classifiers Frame reassembly Outgoing queues with fragmentation per CID Service Flow Handler 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 Outgoing packet Incoming packet Synchronization Messages

7 Information Technology Laboratory, Advance Network Technologies Division High level state machines Base StationMobile Station

8 Information Technology Laboratory, Advance Network Technologies Division Network entry MNBS Channel Scanning Establish uplink and downlink data connections DL_MAP (Downlink map) Link Detected DCD (Downlink Channel Descriptor) Ranging request Link UP UCD (Uplink Channel Descriptor) UL_MAP (Uplink map) Downlink synchronization Uplink synchronization Ranging response Initial ranging Registration request Registration response Registration Normal operations (data Tx/Rx and maintain synchronization)

9 Information Technology Laboratory, Advance Network Technologies Division Handover in 802.16e (Link Down) MNServing BSTarget BS Normal operations Link Down Link down detection Normal operations Channel scanning DL_MAP Link Detected Synchronization messages (DCD, UCD, UL_MAP) Ranging Registration Link UP Layer 3 handover

10 Information Technology Laboratory, Advance Network Technologies Division Handover in 802.16e (Link Going Down) MNServing BSTarget BS Normal operations Link Going Down Normal operations Channel scanning Synchronization messages (DL_MAP,DCD, UCD, UL_MAP) Link Handoff Imminent MOB-SCN_REQ MOB-SCN_RSP Scanning Normal mode Repeat scanning and normal mode intervals MOB-SCN_REP MOB-MSHO_REQ MOB-MSHO_RSP Link Handoff Proceeding Synchronization messages (DL_MAP,DCD, UCD, UL_MAP) Switch channel Ranging and Registration Link Handoff Complete Full or Partial network entry MOB-MSHO_IND Layer 3 handover

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