Transcript VTTlandscape

Advanced WiMAX Adapter to Serve Adaptive
Applications/Processes in Convergenced Manner
Tuomas Nissilä,
VTT Research Centre of
Finland, Oulu,
Email: [email protected],
Phone: +358405028168
NGMAST 2008,
16-19th of September, 2008
Cardiff, Wales, UK
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Contents
• Contents
• Preface
• Introduction
• System model
• Evaluation
• Conclusion
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Preface
• This research has been done in EU IST-FP6 WEIRD project.
 24 months integrated EU project to study WiMAX
extension to isolated research data networks.
 WEIRD team consisted of 16 companies from
different European countries.
 4 WiMAX testbeds each connected to GEANT2
through local research data network.
 For more information:
http://www.ist-weird.eu/
GEANT = Gigabit European Academic Network
WiMAX = Worldwide Interoperability for Microwave Access
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Introduction ( 1 / 2 )
• Several recent studies show that future BWA technologies will
exploit increasingly different adaptive and co-operative techniques
to achieve the requested end-to-end QoS and a more efficient
utilisation of system resources.
• Adaptive and environment aware application/processes require
channel state, network state, and other necessary information for
the decisions to assure the operating to be fair, reliably, and
correct.
• Adaptation also needs the related control of equipment and cooperative network to put the adaptive changes into the practice.
BWA = Broadband Wireless Access
QoS = Quality of Service
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Introduction ( 2 / 2 )
• There is need for an Adapter implementation to serve different
adaptative processes/applications with two primary services.
 Retrieval and delivery of necessary input data for adaptive
applications/processes.
 Trigger of management action in network.
• The basic WiMAX Adapter was presented in the 1st BWA
Workshop in adjacent of NGMAST 2007 Conference, 13-14th of
September 2007, Cardiff, Wales, UK.
• Here we present an Advanced WiMAX Adapter implementation that
could serve different adaptive processes/applications among the
future BWA networks.
BWA = Broadband Wireless Access
WiMAX = Worldwide Interoperability for Microwave Access
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System model
High level view of WiMAX Adapter
Adaptive Application/Process
WiMAX Adapter
WiMAX HW
HW = Hardware
WiMAX = Worldwide Interoperability for Microwave Access
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System model
Advanced WiMAX Adapter for SS/UE, and ASN-GW/NCS systems
SNMP
Agent,
Vendor1
Adaptive
App/proc1
(RC)
Adapter
Adaptive
App/proc2
(MIH)
Adaptive
App/procN
(CNMS)
GA
BS = Base Station
CNMS = Conventional
VSA1
VSA2
VSAN
Network Monitoring System
DB = Data Base
GA = Generic Adapter
MIB = Management Information Base
MIH = Media Independend
Handover
WiMAX
RC = Resource Controller
16d
SNMP = Simple Network
Management Protocol
SS = Subscriber Station
SS/UE
UE = User End
VSA = Vendor Specific Adapter
WiMAX = Worldwide Interoperability for Microwave Access
MIB DB
SNMP
Agent,
Vendor2
MIB DB
SNMP
Agent,
VendorN
Adaptive
App/proc1
(RC)
Adapter
VSA1
Adaptive
App/proc2
(MIH)
Adaptive
App/procN
(CNMS)
GA
VSA2
MIB DB
Ethernet
BS
ASN-GW
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VSAN
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Evaluation
Aims for experiments (1)
• SNMP packet sizes are rather low in normal case, which causes
an unoptimal use of the link.
• This gives a motivation for aggregation study to see how the link
behaves with different levels of aggregated data.
• We studied the benefits of aggregation for the presented Advanced
WiMAX Adapter model.
SNMP monitoring (GET request/response)
Application layer aggregation.
WiMAX and Ethernet, considering both SS-side and ASN-GWside Adapter solutions.
ASN-GW = Access Service Network Gateway
SNMP = Simple Network Management Protocol
SS = Subscriber Station
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Aims for experiments (2)
• Baseline measurements
 Maximum throughput for the WiMAX UL.
 UL modulations from BPSK to 64QAM.
• Aggregation experiments
 For WiMAX and Ethernet links.
 For WiMAX link 64QAM used to reach the upper bounds.
• Performance metrics:
 Packet rate, Goodput, Delay.
 Goodput gain (derived metric).
 Percentual amount of system bandwidth used for the
management (derived metric).
UL = Uplink
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Testbed structure
ASN
WiMAX
cell
Fixed
WiMAX 16d
Base
Station
Subscriber
WiMAX Adapter, Station Traffic on link:
* Aggregated SNMP
SS/UE
monitoring data
WiMAX Adapter,
ASN-GW/NCS
ASN-GW = Access Service Network Gateway
NCS = Network Control System
SNMP = Simple Network Management Protocol
SS = Subscriber Station
UE = User End
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
WiMAX configuration
MAC scheduling
PHY
Modulation
Frequency band
Link condition
Link direction
BS-SS distance
Best Effort
WiMAX 16d, 256 OFDM FDD
BPSK, QPSK, 16QAM, 64QAM for baseline measurements
64QAM (FEC: 3/4) for aggregation tests,
3.5 GHz
LOS/NLOS for baseline measurements
LOS for aggregation tests
Uplink, Downlink
10 m (indoor lab condition)
BS = Base Station
FDD = Frequency Division Duplex
LOS = Line-of-Sight
NLOS = Non-Line-of-Sight
SS = Subscriber Station
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Aggregated dataflow, SS/UE -> WiMAX BS
WiMAX
Adapter,
SS/UE
S S S
S H
1
N
SNMP (S)
Variable binding
(SNMP OID + value)
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UDP
1
WiMAX
SS
20
IP
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Ethernet
DL
UL
DL
UL
1
1
Header
(GET)
BS = Base Station
DL = Downlink
H = Header
OID = Object Identifier
S = Sample
SNMP = Simple Network Management Protocol
SS = Subscriber Station
UE = User End
UL = Uplink
WiMAX = Worldwide Interoperability for Microwave Access
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WiMAX
BS
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Evaluation
Aggregated dataflow, ASN-GW/NCS -> WiMAX BS
WiMAX
BS
H S
S S S
1
WiMAX
Adapter,
1 ASN-GW/NCS
ASN-GW = Access Service Network Gateway
BS = Base Station
H = Header
NCS = Network Control System
S = Sample
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Measurement Setup
• The test data consist from the available SNMP OIDs in the MIB DB
of the Airspan MicroMAX-SoC BS.
• We obted to use all available OIDs for experiments to get practical
averaging in the variable binding sizes.
• The average size for an SNMP variable binding was 20 bytes.
• The measurements in each experiment case were made by
averaging the results derived from 10000 consecutive monitoring
requests.
BS = Base Station
DB = Data Base
MIB = Management Information Base
OID = Object Identifier
SNMP = Simple Network Management Protocol
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Evaluation
Baseline measurement results
• The baseline measurements of this research were to evaluate the
maximum throughput in the WiMAX UL.
• The throughputs each different UL modulation were measured.
Modulation Maximum throughput [Mbps]
BPSK 1/2
QPSK 3/4
16QAM 3/4
64QAM 3/4
0.51
1.48
3.76
5.52
UL = Uplink
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Aggregation impact on round-trip delay [1 ms]
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Evaluation
Packet rate and goodput; Ethernet
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Evaluation
Packet rate and goodput; WiMAX 64QAM
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Evaluation
Aggregation impact on goodput gain [1 bps/bps]
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Evaluation
Maximum usage of system bandwidth for management
Modulation
Maximum bandwidth usage [%]
BPSK 1/2
QPSK 3/4
58
20
16QAM 3/4
8
64QAM 3/4
5
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Evaluation
Hypothesis of the results (1)
• We found that SNMP communication, which is motivated to take
only a very strict amount of bandwidth, has a significant benefit
from aggregation.
 Retreaving monitoring information simply object-by-object
leads to unoptimal use of the link.
 Especially for SNMP monitoring, larger amount of information
is motivated to be requested at once, less frequently.
 The results show this to be fact both for wireless WiMAX link
and wired Ethernet link.
SNMP = Simple Network Management Protocol
WiMAX = Worldwide Interoperability for Microwave Access
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Evaluation
Hypothesis of the results (2)
• We found that SNMP OID aggregation in application-layer
increases the goodput even to 45-folds for WiMAX link and 6-folds
for Ethernet link.
 Even using lower aggregation levels, from 2 to 5, aggregation
gives a significant advance in goodput for both.
 For higher than 5 aggregations the benefits become more
visible for wireless WiMAX link.
 Aggregation and compression methods in HW-specific layers
would allow further benefits to be reached for the link capacity
optimisation.
HW = hardware
SNMP = Simple Network Management Protocol
WiMAX = Worldwide Interoperability for Microwave Access
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Conclusion
• This work presents an Advanced WiMAX Adapter implementation
to allow management action triggering of WiMAX HW.
• The Advanced WiMAX Adapter can serve multiple user
applications, and converge between different WiMAX vendor
equipment.
 This was achieved by splitting the Adapter
to Generic Adapter and Vendor Specific Adapter parts.
 Details are hidden into Vendor Specific Adapter parts.
 High level abstract interface is provided for upper layers.
• Aggregation benefits for SNMP management was studied with
promising results.
HW = Hardware
SNMP = Simple Network Management Protocol
WiMAX = Worldwide Interoperability for Microwave Access
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Discussion
Thank You for Attention!
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