Transcript 21-06-0493-07-0000 - IEEE 802 LAN/MAN Standards Committee

• IEEE 802.21 MEDIA INDEPENDENT HANDOVER
• DCN: 21-06-0493-07-0000
• Title: Media Independent Handover QOS Framework and
parameters
• Date Submitted: March 9, 2006
• Presented at IEEE 802.21 session #13 in Denver, Colorado
• Authors or Source(s): Nada Golmie, Ulises Olvera, Reijo
Salminen, Mathieu Peresse, Eric Njedjou
• Abstract: Description of proposed MIH QoS Metrics and
considerations of interworking with media specific technologies
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Motivation and objectives
•
Propose a QOS framework for the MIH including a set of MIH
QOS performance metrics:
1. are derived from media and technology specific parameters.
2. scale well across different media types
3. can be provided as a service to the MIH user (application)
• MIH QOS framework consists of:
1.
2.
MIH QOS performance metrics (MIH QOSM)
Primitives to
(a) communicate MIH user (application) QOS requirements to the MIH
(b) extract network specific measurements
(c) set trigger thresholds for these measurements and
(d) report QoS events upon threshold crossing
(e) report real-time measurements to the MIH user
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Network QOS Model
Performance targets
for audio and video applications
Table I.1/ITU-T G1010
Application
Requirements
Static parameters
Services
Real-time
parameters
Source
Voice
Video
QoS Req.
Destination
Delay (ms)
<150 ms
<150 ms
PLoss
<3%
<1%
IP Network Cloud
No target
performance
metrics are
published
...
Access
Network
Access
Network
Net. Perf.
Param.
Network IP
performance
objectives
Table 1/ ITU-T
Y.1541
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QOS Classes
Class 0
Class 1
Class 2
Class 3
Class4
IPTD
100 ms
400 ms
100 ms
400 ms
1s
IPDV
50 ms
50 ms
U
U
U
IPLR
1 x 10-3
1 x 10-3
1 x 10-3
1 x 10-3
1 x 10-3
IPER
1 x 10-4
1 x 10-4
1 x 10-4
1 x 10-4
1 x 10-4
4
Network performance measures
a layered approach
SRC
UNI
User-Network Interface
AN
Protocol Stack
Segment IP Network Cloud Segment
(may be comprised of Network Sections#n
#1 belonging
to one or more network operators)
UNI
TE
AN
UNI
ER
ER
...
ER
ER
TE Terminal Equipment
Edge
ER Router
DST
. . . ER
ER
TE
LAN
LAN
Layer 1
Layer 2
Layer 3
Layer 4
Layer 5
Layer 1
Layer 2
Example of delay calculation at layer 3
End-to-end delay = delay AN + delay segment #1+ …+ delay segment#n + delay AN
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Why do we care about QoS requirements
in MIH and in 802.21?
• MIH is supposed to facilitate handovers among heterogeneous
network technologies in order to provide seamless mobility and
ubiquitous connectivity (“always best connected”)
• Providing seamless mobility has specific performance
implications with respect to the application requirements, for
example:
• Minimize handover latency so as to minimize the end-to-end
delay and meet the application delay requirements
• Minimize the packet loss incurred during a handover so as to
minimize the end-to-end packet loss and meet the
application packet loss requirements.
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Proposed MIH QOS Framework
MIH User
Application QOS Req.
MIH QOS parameters report
MIH QOS
Model
(QOSM)
Application Layer
Transport Layer
Throughput, delay, delay variation
Network Layer
Throughput, Delay,
Cellular
Delay, Packet
Loss, Delay
Variation,
Throughput,
MAC
Delay, Packet Loss, Delay
Variation, Throughput,
Extract parameter list
Set parameter thresholds
PTD
PDV
PLR
PER
Throughput
PHY
RSSI, BER, Power level,
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Proposed MIH QOS Model (QOSM)
The MIH QOSM consists of the following performance metrics:
1. Packet Transfer Delay (PTD): upper bound on the mean
delay.
2. Packet Delay Variation (PDV): upper bound on the 1-10-3
quantile on the PTD minus the minimum IPTD.
3. Packet Loss Ratio (PLR): upper bound on the packet loss
probability.
4. Packet Errored Ratio (PER): upper bound on the number of
errored packets per total packets sent.
5. Throughput (bits/s): the number of bits successfully
received divided by the time it took to transmit them over the
medium.
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An example of mapping of MIH User QOS
onto MIH QOSM
3GPP UMTS (TS 23.107)-ITU-T (Y.1541)
Source: Liaison Statement on Mapping between ITU-T and 3GPP QoS Classes and Traffic Descriptors. Technical Specification Group Services and
System Aspects. Meeting #23, Phoenix, AZ, USA, 15-18 March 2004
3GPP UMTS
QoS
Real Time
Conversational
• Preserve time relation
(variation) between info
entities of the stream
Y.1541
QoS Class
Class 0
• Conversational Pattern
(stringent and low delay)
Streaming
• Preserve time
relationship between
info entities of the
stream
Best Effort
Interactive
Background
•
Request/Response
pattern
• Destination is
not expecting data
within a certain
time
• Preserve Payload
content
• Transfer delay
• Transfer delay
•Transfer delay
•SDU error ratio
• SDU error ratio
• SDU error ratio
• Preserve payload
content
•SDU error ratio
IPTD≤100 ms, IPDV≤50 ms
IPLR≤10-3 ms, IPER≤10-4ms
Class 1
IPTD≤400 ms, IPDV≤50 ms
IPLR≤10-3 ms, IPER≤10-4ms
Class 2
Class 3
IPTD≤400 ms,100 ms, 1
s, IPLR≤10-3 ms,
IPER≤10-4ms
Class 4
Class 5
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Best Effort
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An example for mapping MIH QoSM to media specific
real-time parameters
802.21 QoS
Metric
ITU-T
1540/1541
PTD
IPTD
fctn
IETF NSIS
qspec
802.1 - ’AV
bridging TG’
802.11
802.16
802.20
Path Latency
TBD (included
in draft .1AS
PAR)
Delay Bound (.11e)
Maximum
Latency
Max_Latency
TBD (included
in draft .1AS
PAR)
Delay Bound (.11e)
Tolerated
Jitter
Max_Jitter
Packet Loss
Ratio
TBD
dot11CountersGroup
(.11k)
N.A.
Max_Packet_L
oss_Rate
Packet Error
Ratio
TBD
Packet Error
Rate
N.A.
Bandwidth
TBD
Maximum
Sustained
Traffic Rate
Peak Rate,
Bucket Size,
Token Rate
fctn
PDV
IPDV
PLR
IPLR
fctn
PER
IPER
Throughput
N.A.
Path Jitter
dot11BSSLoadGroup
(.11k)
QoS Metrics Report
(.11k)
dot11BSSLoadGroup
(.11k)
QoS Metrics Report
(.11k)
QoS Metrics Report
(.11k)
dot11CountersGroup
(.11k)
QoS Metrics Report
(.11k)
Minimum/Mean/Peak
Data Rate (.11e)
Functions that are mapping the MIH QOSM to media specific parameters is
left implementation dependent
Translation ’challenge’ colour codes: Easy Medium Hard
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Next steps
• Make changes to the 802.21 draft D05
• Investigate availability and use of media specific parameters
• informative material or annex added to 802.21 spec.
• Work with IETF Next Steps In Signaling (NSIS) Group.
• Establish a liaison with NSIS and ITU-T study group 12
working on network performance objectives for IP-based
services.
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Additions and extensions to the 802.21
draft D05
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Proposed MIH QOS Model (QOSM)
Propose to add the following QOS performance metrics definition for
characterizing the MIH service in IEEE 802.21 D05 draft on section
5.1.3 QoS in latest 802.21 draft (version 5)
The MIH QOSM consists of the following metrics:
1. Packet Transfer Delay (PTD): upper bound on the mean
delay
2. Packet Delay Variation (PDV): upper bound on the 1-10-3
quantile on the PTD minus the minimum IPTD.
3. Packet Loss Ratio (PLR): upper bound on the packet loss
probability.
4. Packet Errored Ratio (PER): upper bound on the number of
errored packets per total packets sent.
5. Throughput (bits/s): the number of bits successfully
received divided by the time it took to transmit them over the
medium.
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Proposed Link/MIH parameter
discovery commands
Propose to add the following MIH/Link commands for
discovering link and network specific parameters
Add following command to Table 5, section 6.2.6.2, page 41
• Link Parameter Discover: Discover link specific parameters
Add the following command to Table 4, section 6.2.6.1, page
41
• MIH Parameter Discover: Discover higher layers specific
parameters
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Proposed Link/MIH parameter
discovery primitives (2)
Propose to add the following MIH/Link primitives for discovering link and network
specific parameters:
Add following command to Table 14, section 7.2.2.1, page 65
• MIH Parameter Discover: Discover higher layer specific parameters
Add the following command to Table 15, section 7.2.2.2, page 65
• Link Parameter Discover: Discover link specific parameters
Add the following primitives in section 7:
“7.3.20 Link_Parameter_Discover.request”
“7.3.21 Link_Parameter_Discover.response”
“7.4.16 MIH_Parameter_Discover.request”
“7.4.17 MIH_Parameter_Discover.response”
expect potential changes to this section
section 7.2.1 lists media dependent SAPs. Additional information found in each of the standards could get
fed into that section. The additional primitives in the media independent sections should address the
scalability issue for future standards that we do nothing about today.
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Proposed re-using Link/MIH parameter
threshold setting commands
Propose to re-utilize existing commands for setting Link/MIH parameter
thresholds.
• MIH Configure Link thresholds:Table 4, section 6.2.6.1, page 41
• Link Configure thresholds: Table 5, section 6.2.6..2, page 41
The parameters used in these commands are those discovered by the
proposed Link_Parameter_Discover command. The same applies to the
MIH_Configure_Thresholds.
Therefore the primitives described in section 7.3.7.2 and 7.4.8.1 need to be
changed in order to reflect that.
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Proposed reusing Link/MIH QOS
parameters report
Propose to use existing Link/MIH events in order to report MIH QOS
parameters to the MIH user:
Table 2, section 6.1.7 page 37:
• Link Parameters Change: Link parameters have crossed specified
thresholds
Table 3, section 6.1.8, page 37
• MIH Link Parameters Report: Link parameters have crossed specified
threshold and need to be reported.
Check consistency with primitives described in section 7.
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Proposed QoS requirements primitives
between the MIH user and the MIH
Propose to add the following primitives to provide the MIH user
(application) a standardized interface in order to communicate their
QOS needs.
• One primitive using the Command Service:
• MIH_Configure_QoS.request/response:
•
•
From MIH user to MIH.
Parameters: Packet Transfer Delay, Packet Delay Variation, Packet Loss
Ratio, Packet Errored Ratio, Throughput, MIH User ID, Mobile Node
Address.
• One primitive using the Event Service:
• MIH_Configure_QoS.indication:
•
•
From MIH to MIH user
Parameters: Packet Transfer Delay, Packet Delay Variation, Packet Loss
Ratio, Packet Errored Ratio, Throughput, MIH User ID, Mobile Node
Address.
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Backup slides
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Useful Performance Metrics
Background slide
ITU-T Y.1541: Network Performance objectives for IP-based services. Metrics
defined in ITU-T Y.1540
•
IP Packet Transfer Delay (IPTD): upper bound on the mean end-to-end delay
(UNI-to-UNI).
•
IP Packet Delay Variation (IPDV): upper bound on the 1-10-3 quantile on the
IPTD minus the minimum IPTD.
•
IP Packet Loss Ratio (IPLR): upper bound on the packet loss probability.
•
IP Packet Errored Ratio (IPER): upper bound on the number of errored packets
per total packets sent.
Other useful measures
•
Throughput (bits/s): the number of bits successfully received divided by the time
it took to transmit them over the medium
The reason we care about this slide from an MIH perspective is that the MIH
is providing a service to the application the same way the network does. Therefore
in order to provide a better service to the application, the MIH needs to track
and characterize its functionality/service in terms of how they impact the application
QOS.
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NSIS layering
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QoS NSLP in a node
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Basic sender- and receiver initiated NSLP
operations
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Changing QoS Models in NSLP
As RESERVE enters the
region, the end-to-end
reservation is mapped into
the local QoS Model, and put
on top of QSpec stack. It is
then popped off the stack at
the egress.
RESERVE
{QSpec1}
RESERVE
{QSpec2, QSpec1}
RESERVE
{QSpec2, QSpec1}
RESERVE
{QSpec1}
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