Chapter 4: Location Management for Networks with Mobile Users - PowerPoint PPT Presentation

1 / 22
About This Presentation
Title:

Chapter 4: Location Management for Networks with Mobile Users

Description:

Huge discrepancy between MobileIP and location management schemes in cellular/PCN ... registered a MTSO when the phone is turned on ... – PowerPoint PPT presentation

Number of Views:99
Avg rating:3.0/5.0
Slides: 23
Provided by: BcA6
Category:

less

Transcript and Presenter's Notes

Title: Chapter 4: Location Management for Networks with Mobile Users


1
Chapter 4 Location Management for Networks
with Mobile Users
  • B. R. Badrinath and Tomasz Imielinski
  • 1997/9/19
  • ???

2
Introduction (1)
  • Location management
  • Internet connectionless, MobileIP working group
  • cellular/PCN connection oriented
  • Binding
  • mapping between the logical identifier of a user
    and physical location
  • Huge discrepancy between MobileIP and location
    management schemes in cellular/PCN

3
Introduction (2)
  • Key issues in location management
  • Where is the binding stored?
  • Who is responsible for keeping the binding up to
    date?
  • What happens if the binding is not available or
    is outdated?
  • Location directory
  • Home location

4
Location Management in the Internet
  • Sonys Virtual IP Proposal
  • IBM Proposal
  • Columbia Proposal
  • IETF Proposal
  • Comparison of location management in MobileIP
    proposals

5
Sonys Virtual IP Proposal (1/2)
  • Binding information
  • Mobile host ltVN, PNgt
  • VN permanent address of the mobile host
  • PN acquired by the mobile host when it moves to
    a new network
  • Store the binding home location of the user
  • Binding is updated by the mobile whenever it
    obtains a new physical address
  • Cache the binding intermediate gateways

6
Sonys Virtual IP Proposal (2/2)
7
IBM Proposal (1/2)
  • Binding information
  • Physical location IP address of base station
  • Store the binding LD in home location
  • Cache the binding senders
  • Loose source routing (LSR option)
  • redirection of packets sent to home gateway
  • mobile host reply to the sender
  • Update the binding mobile host

8
IBM Proposal (2/2)
9
Columbia Proposal (1/3)
  • Binding information
  • same to the IBM scheme
  • Store the binding
  • no home location directory
  • several MSS covering a mobile subnet
  • IP within IP packet
  • Update the binding new MSS
  • if binding information is not valid, search is
    used by the MSSs to find he up to date binding

10
Columbia Proposal (2/3)
  • Classification of moves
  • intra-campus moves only binding changes
  • inter-campus moves
  • logical identifier of the mobile host changes
  • acquire a new temporary address nonce address
  • tunneling packets to foreign network (FN)

11
Columbia Proposal (3/3)
12
IETF Proposal (1/2)
  • Binding informaion
  • home agent
  • maintaining information about the current
    location of MH
  • tunneling packets to that location
  • MH moving to a new network
  • acquire a temporary IP address
  • register with a foreign agent
  • ltIP, care-of-addressgt or ltIP, IP of foreign
    agentgt
  • Extension of basic IETF proposal
  • route optimization and cache agent

13
IETF Proposal (2/2)
14
Comparison of Location Management in MobileIP
proposals
15
Location Management in Cellular Telephone
Networks and in PCN
  • Location management in American Mobile Phone
    System (AMPS)
  • Location management in Cellular Digital Packet
    Data (CDPD)
  • Proposals for future Personal Communication
    Network (PCN)

16
Location Management in AMPS
  • Mobile Telephone Switching Office (MTSO)
  • several BS are connected to a MTSO
  • interconnected to a public switched public
    telephone network
  • Binding information
  • logical identifier unique terminal equip. number
  • registered a MTSO when the phone is turned on
  • finding the location of callee, BS within the
    home area are paged for the terminal equip.
    number
  • roaming

17
Location Management in CDPD
  • Configuration of CDPD
  • mobile end system (MES)
  • mobile data base station (MDBS)
  • mobile data intermediate system (MDIS)
  • Binding information
  • logical identifier unique terminal equip. number
    or an IP address assigned by MDIS
  • Moving to a new MDIS
  • re-register with the new MDIS
  • appropriate forwarding of packets

18
Location Management in PCN (1/3)
  • Future PCN
  • high density of mobile subscribers
  • moving across possibly picocells
  • central DB is infeasible
  • Architectures proposed for PCN
  • set of DBs distributed in a hierarchical network
  • HLR (Home Location Register)
  • VLR (Visitor Location Register)

19
Location Management in PCN (2/3)
  • Using the hierarchical topology of the network
  • location updates are sent only when the mobile
    terminal enters a new region
  • leave a level of uncertainty
  • search strategy in the PCN
  • Flat scheme
  • Expanding scheme
  • Hybrid scheme

20
Location Management in PCN (3/3)
  • Structure of PCN architecture

21
Performance Issues
  • Minimize the overhead on the network traffic
  • traffic due to location updates
  • traffic associated by control messages
  • Schemes based on HLR and VLR do not scale well
  • Location update costs vs. network search costs
  • Latency in connection establishment

22
Future Adaptive Location Management
  • Mobility profile
  • knowing where the receivers are
  • knowing where the usual senders are spatial
    distribution of the likely caller
  • Call to mobility ratio
  • paging scheme vs. pointer forwarding scheme
  • No single optimal location strategy for all users
Write a Comment
User Comments (0)
About PowerShow.com