Download - September 17, 2008 OBELE Brownson O . [email protected]

IEEE NGMAST 2008 Fixed Mobile Convergence: A Self-

Aware QoS Architecture for Converging WiMAX and GEPON

Access NetworksObele Brownson and Kang Minho

September 17, 2008

OBELE Brownson O.

[email protected]

Information and Communications University

Information and Communications University 2

Agenda

Abstract1

Introduction 2

The Converged WiMAX-GEPON Architecture3

Simulation Results4

Conclusion5

References6


1.1 Abstract

The access network has remained the bottleneck in efforts to deliver bandwidth intensive new-generation applications and services to subscribers

In the wired access network, GEPON is a promising technology for relieving this bottleneck while GEPON’s counterpart in wireless access networks, is WiMAX

A converged quadruple-service (video, voice, data and mobility) enabled access network, which takes full advantage of the strengths and weaknesses of each of these remarkable technologies, no doubt makes an attractive new-generation access network solution

3


NeedsNeeds Access networks that are robust, have high bandwidth, low cost, deep coverage, support mobility, quick to roll-out, rich QoS support Video, voice, data and mobility in the access network

ApproachApproach Integration of the pros of GEPON – Low cost, low error-rate, reliability and high bandwidth with the pros of WiMAX – deep coverage, mobility, rich QoS support, NLOS etc. GEPON as backhaul for connecting multiple dispersed WiMAX BSs

BenefitsBenefits Almost seamless integration as both GEPON and WiMAX have a broadcast-and-select style downlink and a shared uplink A cost effective and true First Mile solution with quadruple services An attractive FMC solution for new-generation access networks

1.2 NABC Summary

CompetitionCompetition

FMC Solutions Integration of WiMAX & other PON types Integration of Wifi or other wireless techs & PON types

Non FMC Solutions EPON and WiMAX deployed separately


2.1 Introduction

GEPON (IEEE 802.3ah) A promising optical-fiber based new-generation wired access network technology,

which provides low-cost high bandwidth access over longer distances to the curb, FTTC; to the building, FTTB; or directly to the home, FTTH

No active elements in the signals path from source to destination Broadcast-and-select style downstream and a shared upstream Connectionless and provides DiffServe QoS Defines seven (7) QoS classes OLT aggregates BW requests from ONUs and schedules the shared upstream

WiMAX (IEEE 802.16e) A promising low cost new-generation wireless access network technology with

high bandwidth, mobility, NLOS, and finely provisioned QoS Connection / flow oriented technology with IntServe QoS Provisioning Defines five (5) QoS classes: UGS, rtPS, ertPS, nrtPS, and BE BS aggregates BW requests from SSs and schedules the shared upstream

6


They both have a broadcast-and-select style downlink and a shared uplink

They are both low-cost, high bandwidth, and far-reach new-generation access network technologies, but they operate over different interfaces (wired and wireless interfaces respectively)

Their convergence makes a very attractive solution for low-cost, far-reach, fine-grained QoS, and QPS(video, voice, data and mobility) enabled new-generation converged wired-wireless access networks

7

2.2 Why Converge WiMAX and GEPON?


3.1 Proposed Convergence Architecture

9

Traditional GEPON / WIMAX subscribers are supported via wired / wireless connections to the ONU-BS

The OLT is retained at it’s CO location GEPON ONUs and WiMAX BSs are

replaced with a single CPE –> ONU-BS eSSs and wSSs connected to the same

ONU-BS form a LAN -> the ONU-BS switches inbound traffic between them

Can be implemented over already deployed PONs; ONUs would simply be replaced by the converged ONU-BSs

Eliminates the network-wide single point of failure found in OLT-BS convergence models

Reduced queuing delay and probability of packet drop at the user-nodes compared with OLT-BS models

Decentralized architecture reduces latency and enables quicker scheduling


3.2 The Converged WiMAX-GEPON Architecture

We present a network, which studies the traffic behavior of its attached subscriber stations over time and adjusts its procedures and algorithms to suite this observed behavior

Specifically, the network observes and learns the traffic arrival rate / behavior at the eSSs, wSSs, and ONU-BSs; and then attempts to fairly estimate instantaneous queue sizes, so as to be able to predict overall network load at any point in time

This knowledge can be applied to improve QoS and overall network performance by dynamically adapting to the true nature of network traffic

The converged network supports integrated multimedia (video, audio, and data) services, which is a key to revenue generation, customer satisfaction, and ultimately, the key for the survival of service providers

In the converged network, communication between the ONU-BS and wSSs is via WiMAX PDUs; while for ONU-BS <-> eSS <-> OLT, it’s via Ethernet PDUs

10


3.3 QoS Mapping and ONU-BS Queues

Proposed Mapping of GEPON and WiMAX QoS Queues

11

Proposed set of Queues for both the OLT, and the Converged ONU-BS


3.4 Converged ONU-BS Architecture

12


3.5.1 Proposed Amendments to GEPON

Unlike in normal GEPON, REPORTs don’t have to come at the end of a GRANT window

All ONU-BSs in the network, work co-operatively to ensure an improved overall network performance

When there are newly arriving high priority traffic or an increased arrival rate of packets during an ONU-BS’s GRANT window, the ONU-BS should send a timely request to the OLT for a possible extension of its GRANT window or an earlier rescheduling

This is based on the assumption that the OLT has sufficient information regarding the network (obtained through the network learning process) to suggest that other nodes will not fully utilize their minimum guaranteed grant

13


The OLT grants this extension request, if and only if the probability of other ONU-BSs starving is within an agreed acceptable range for the network

REPORTs contain time within which the queued packets arrived; enabling the OLT better predict the arrival of more packets before the REPORT is served

A network-wide fair, minimum grant time per ONU-BS, which is based on the UGS queues is computed at the OLT

ONU-BSs are sequentially polled to transmit for at least this minimum time slot with the actual GRANT time depending on observed total network load

ONU-BSs with nothing to send, working co-operatively, will promptly inform the OLT during their minimum time slot, so their allocated slot can be terminated and the next ONU-BS polled

14

3.5.2 Proposed Amendments to GEPON


4.1 Simulation Results

16

Fig. 4. Average End-to-End Delay in Seconds Fig. 5. Throughput of the OSC to OLT uplink


5.1 Conclusion

18

We’ve reviewed WiMAX and GEPON access networks; and discussed the enormous benefits and good market sense we believe their convergence brings;

We’ve proposed a self-aware QoS architecture for such a convergence, which requires some modifications to the traditional GEPON to make it self-aware and thus helps to improve both the performance of the converged network and GEPON;

We showed the results of simulation experiments conducted to evaluate the effectiveness of our proposed converged network; and

As future work, we are deriving closed form mathematical expressions of the queuing time and end-to-end delay per QoS class under both Poisson and Self-Similar traffic conditions, because it helps the understanding of the network and facilitates the provisioning of tightly bound QoS parameters to end-users


References

1) Shen, G., Tucker, R. S., Chae, C. J., “Fixed Mobile Convergence Architectures for Broadband Access: Integration of EPON and WiMAX,” IEEE Communications Magazine, August 2007

2) Luo, Y., Yin, S., Wang, T., Suemura, Y., Nakamura, S., Ansari, N., Cvijetic, M., “Qos-Aware Scheduling over Hybrid Optical Wireless Networks,” OFC/NFOEC 2007, March 25-29, 2007

3) Luo, Y., Wang, T., Weinstein, S., Cvijetic, M., Nakamura, S., “Integrating Optical and Wireless Services in the Access Network,” OFC/NFOEC, 2006

4) Luo, Y., Ansari, N., Wang, T., Cvijetic, M., Nakamura, S., “A QoS Architecture of Integrating GEPON and WiMAX in the Access Network,” IEEE Sarnoff Symposium 2006, Princeton, New Jersey, March 2006

5) Luo, Y., Yin, S., Ansari, N., Wang, T., “Resource Management for Broadband Access Over Time-Division Multiplexed Passive Optical Networks,” IEEE Network, September/October 2007

6) Kramer, G., Mukhejee, B., Pesavento, G., “IPACT: A Dynamic Protocol for an Ethernet PON (EPON),” IEEE Communications Magazine, February 2002

20


References

7) Kramer, G., Mukhejee, B., “Supporting differentiated classes of service in Ethernet passive optical networks,” Journal of Optical Networking, vol. 1, Nos. 8&9, August/September 2002

8) Rajen Datta, “WiMAX 802.16e timing requirements & TimeMAX”, http://ngn.symmetricom.com/pdf/WiMAXandTimeMAX_Ext_v5.pdf, July 2007

9) WiMAX Forum, “Mobile WiMAX – Part I: A Technical Overview and Performance Evaluation,” August 2006

10) WiMAX Forum, “Mobile WiMAX – Part II: A Comparative Analysis,” May 2006

11) Xhafa, A. E., Kangude, S., Lu, X., “MAC Performance of IEEE 802.16e,” IEEE 62nd Vehicular Technology Conference, Vol. 1, pp. 685-689, September 2005

12) Bhandari, B. N., Kumar, R. V. R., Maskara, S. L., “Uplink Performance of IEEE802.16 Medium Access Control (MAC) Layer Protocol,” IEEE International Conference on Personal Wireless Communications, 2005

21


Acronyms

UGS Unsolicited Grant Service rtPS real-time Polling Service ertPS extended real-time Polling Service nrtPS non real-time Polling Service BS Best Effort FMC Fixed and Mobile Convergence EPON Ethernet Passive Optical Network WiMAX Worldwide Interoperability for Microwave Access Forum NLOS Non Line Of Sight QoS Quality of Service DL Downlink / Downstream UL Uplink / Upstream MAC Media Access Control ONU Optical Network Unit CID Connection Identifier BW Bandwidth BS Base Station SS Subscribed Station OLT Optical Line Terminal SPoF Single Point of Failure QPS Quadruple Play Service

Download - September 17, 2008 OBELE Brownson O . [email protected]

Top Related