QoS Issues in Wireless LAN Jian Zhang

1
QoS Issues in Wireless LAN
Jian Zhang

• Integrate Servive
• Admission Control
• Mobile RSVP (Talukdar A.)
• Differentiate Service
• Hierarchical QoS architecture (J.Antonio)
• Enhanced QoS architecture(Indu Mahadevan)
• Ad hoc (MANET)

2
Mobile Reservation Issues and Solution

• request for the entire connection time, no matter
  handoff
• make advance resource reservation at the multiple
  locations it may possibly visit

• admission control
• mobile RSVP

3
Admission Control

• Fixed strategy fixed percentage of AR capacity
  for handover connection
• Static strategy reserve a fraction of AR
  capacity for each possible traffic class,
  fraction calculated from historical traffic
• Dynamic strategy adapt capacity reservation
  based on connections in the neighbouring cells

4
Mobile RSVP

• MSPEC the set of locations the mobile node will
  visit during the connection. (a mobile node can
  specify its own MSPEC, either from the network or
  from its mobility profile )
• A mobile makes active reservation from its
  current location and passive reservation from the
  other locations in its MSPEC
• 3 service classes
• Mobility Independent Guarantees
• Mobility Independent Predictive
• Mobility Dependent Predictive

5
QoS Issues in Wireless LAN

• Integrate Servive
• Admission Control
• Mobile RSVP (Talukdar A.)
• Differentiate Service
• Hierarchical QoS architecture (J.Antonio)
• Enhanced QoS architecture(Indu Mahadevan)
• Ad hoc (MANET)

6
Hierarchical QoS architecture

• Global QoS Management Edge router QoS_POLITY
  (bandwidth, admission control, traffic class in
  one cell)
• Local QoS Management Access router QoS_CONFIG
  (EF rate, AF/BE rate, AF weight)
• Need QoS signaling
• In-band, piggyback data packet, QoS_request,
  handoff
• Out-band, ICMP packet, QoS_policy, QoS_config

7
Hierarchical QoS architecture (continue)

• Edge router set policy of access routers
• In-band request from mobile
• Out-of-band config by access router

8
Enhanced QoS architecture

• Mobility allocate a small percentage of the
  bandwidth for handoff
• High loss rate the receiver periodically sends
  feedback, BS creates a compensation class and
  reallocate to lossy receiver temporarily
• Low bandwidth reducing traffic at BS by flow
  control
• Power constrain handling battery power level
  periodically sent to the BS, mobile DSCP is
  remarked

9
QoS Issues in Wireless LAN

• Integrate Servive
• Admission Control
• Mobile RSVP (Talukdar A.)
• Differentiate Service
• Hierarchical QoS architecture (J.Antonio)
• Enhanced QoS architecture(Indu Mahadevan)
• Ad hoc (MANET)

10
QoS issues in Ad hoc (MANET)

• Ad hoc wireless network
• no network infrastructure
• dynamically changed topology
• self-create, self-organize, and self-administer
• MANET QoS is open research area
• QoS-aware Routing a path from a source to the
  destination that satisfies the needs of the
  desired QoS

11
Core Extraction Distributed Ad Hoc Routing

• Core extraction minimum dominating set of the ad
  hoc network, maintains the local topology,
  perform route computations
• Link state propagation propagates the link
  states of stable high-bandwidth links to the core
  nodes
• Route computation first establishes a core path
  from the source to the domain of the destination
  satisfying the requested bandwidth. This node
  then becomes the source of the next iteration.

12
Conclusion

• Wireless local area networks provide many
  advantages compared to the wired network, a large
  number of QoS enhancement schemes have been
  proposed
• Reservation protocol mechanism integrated with
  wireless LAN
• Extending DiffServ to wireless LAN provides
  consistent end-to-end QoS behaviour