LQS%20Project%20QoS%20Client%20Protocol

1
LQS ProjectQoS Client Protocol

• Jochen Eisl ICM N PG SP RC
• 27-08-2002

2
Presentation Overview

• CASP QoS Feature Overview
• Reservation Range
• Partial Reservation
• Advance Reservation
• Resource Query
• Reserve / Commit Mechanism
• Local Information
• Mobility Showcase

3
Reservation Range

• Specification of upper and lower resource
  threshold
• Nodes reserve highest amount below maximum
• Nodes with higher reservation are updated on
  return path
• Message reduction
• Support for adaptive application

4
Partial Reservation (PR)

• Reservation initially may fail at some nodes
• Application may accept backholes for some time
• PR objects includes
• Counters to record number of failed hops (C1)
• Counters with acceptable number of failed hops
  (C2)
• Retry flag
• Reservation fails at any node, if C1 gt C2
• Application of local algorithm if retry flag is
  set
• Enhanced resource utilization
• Higher chance of service delivery
• New accounting charging schemes

5
Advance Reservation

• Resource reservation at any time in future
• Time object includes start / end time in NTP
  format
• Potential feature for conference applications
• Periodic reservation seems attractive but needs
  further investigation

6
Resource Query

• Query resources before requesting them
• Return of response message with status object
• Status object includes for each hop
• Node idendity
• Success of (potential) reservation
• Failure reasons
• Reservation idendity (version)
• Resources dont have to be allocated
• 3rd party query to coordinate resource allocation
  among different parties

7
Reserve / Commit Mechanism

• Reserve assigns resources soft state
  reservation
• Commit allocates resources for exclusive use
  hard state reservation
• Receiver / Sender oriented reservation
• Priority object for reservation priority
• Fast reservation of resources (first message)
  ?? RESV message (RSVP)
• Efficient resource usage
• Applicable for mobility handover

8
Local Information

• CASP- QoS carries local information
• Information insertion / deletion by any node
• Examples for local information
• Authorization token
• DSCP
• Aggregation
• Accounting charging
• Syntax and path information decoupled from the
  protocol
• Minimize transport of information overhead
• Authorization of sink / source nodes

9
Mobility Showcase

• zhtzt

oCoA
Old Access Router
Crossover Router
CN
New Access Router
nCoA
CR determined by next hop discovery
10
Mobility Showcase

• zhtzt

oCoA
Old Access Router
Crossover Router
CN
CASP-ADD
New Access Router
nCoA
11
Mobility Showcase

• zhtzt

CASP-DEL
oCoA
CASP/QOS-REL
Old Access Router
Crossover Router
CN
New Access Router
nCoA
12
Mobility Showcase

• zhtzt

oCoA
Old Access Router
Crossover Router
CN
CASP/QOS-COMMIT
New Access Router
nCoA