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Versions: (draft-shao-opsawg-capwap-hybridmac) 00 01 02 03 04 05 06 07 08 RFC 7494

Network Working Group                                            C. Shao
Internet-Draft                                                   H. Deng
Intended status: Standards Track                            China Mobile
Expires: April 14, 2014                                    R. Pazhyannur
                                                                   Cisco
                                                                 F. Bari
                                                                    AT&T
                                                                R. Zhang
                                                           China Telecom
                                                           S. Matsushima
                                                        SoftBank Telecom
                                                        October 11, 2013


                   IEEE 802.11 MAC Profile for CAPWAP
                 draft-ietf-opsawg-capwap-hybridmac-01

Abstract

   The CAPWAP protocol defines two modes of operation for IEEE 802.11
   WTPs: Split and Local MAC (medium access control), as described in
   [RFC5415],[RFC5416].  Specifically, [RFC5416] describes in detail the
   division of labor between WTP and AC in the Split and Local MAC
   modes.  Unfortunately, there are many functions that have not yet
   been clearly defined whether they belong to the WTP or the AC.  For
   example IEEE 802.11 encryption is specified as located in either in
   the AC or the WTP with no clear way to negotiate where it should be
   located.  This lack of specification leads to interoperability
   between AC and WTP when AC and WTP come from different vendors.  To
   solve this problem, this specification defines the concept of IEEE
   802.11 MAC profile where each profile refers to a table containing an
   unambigous division of labor between WTP and AC.  The profile is used
   as follows: the WTP informs the AC of the supported profiles and the
   AC selects the profile when it configures the WTP.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.







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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on April 14, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   4
   3.  IEEE MAC Profile Descriptions . . . . . . . . . . . . . . . .   4
     3.1.  Split MAC Profile . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Local MAC Profile . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Hybrid MAC Profile  . . . . . . . . . . . . . . . . . . .   6
       3.3.1.  Hybrid-MAC model Frames Exchange  . . . . . . . . . .   7
   4.  IEEE 802.11 MAC Profile . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The CAPWAP protocol supports two MAC modes of operation: Split and
   Local MAC, which has been described in [RFC5415][RFC5416].  In Split
   MAC mode, all L2 wireless data and management frames are encapsulated
   via the CAPWAP protocol and exchanged between the AC and the WTP.
   The Local MAC mode of operation allows for the data frames to be
   either locally bridged or tunneled as 802.3 frames.  Unfortunately,
   there are many functions that have not yet been clearly defined



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   whether they belong to either the WTP or the AC in the Split and
   Local modes.  For example IEEE 802.11 encryption is specified as
   located in either in the AC or the WTP with no clear way to negotiate
   where it should be located.  Because different vendors have their own
   definition of the MAC mode, many MAC layer functions are mapped
   differently to either the WTP or the AC by different vendors.
   Therefore, depending upon the vendor, the operators in their
   deployments have to perform different configurations based on
   implementation of the two modes by their vendor.  If there is no
   clear definition of split MAC and local MAC, then operators will
   continue to experience difficulty in interoperating WTPs and ACs from
   different vendors.

   Figure 1 quoted from [RFC5416], illustrates how the functions are
   processed in different places in the Local MAC and Split MAC.
   Further, for some functions such as the Frag. / Defrag.  Assoc. /
   Disassoc / Reassoc., Encryption the protocol does not explicitly map
   processing of such functions to the WTP or the AC.  Therefore the
   location of these features becomes vendor specific and this increases
   the difficulty of interoperability between WTPs and ACs from
   different vendors.


   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Functions                  | Local MAC | Split MAC |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Distribution Service     |  WTP/AC   |     AC    |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Integration Service      |   WTP     |     AC    |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Beacon Generation        |   WTP     |     WTP   |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Probe Response Generation|   WTP     |     WTP   |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Function    |Power Mgmt               |   WTP     |     WTP   |
   +             |/Packet Buffering        |           |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Fragmentation            |   WTP     |    WTP/AC |
   +             |/Defragmentation         |           |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Assoc/Disassoc/Reassoc   |  WTP/AC   |     AC    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Classifying              |   WTP     |     AC    |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 QoS  |Scheduling               |   WTP     |    WTP/AC |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Queuing                  |   WTP     |    WTP    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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   |             |IEEE 802.1X/EWTP         |   AC      |    AC     |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 RSN  |RSNA Key Management      |   WTP     |     AC    |
   +  (WPA2)     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.11              |   WTP     |    WTP/AC |
   +             |Encryption/Decryption    |           |           |
   |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

              Figure 1: Functions in Local MAC and Split MAC

   To allievate the above mentioned problem, this specification
   introduces IEEE MAC profle.  The MAC profile unamabigously specifies
   where the various MAC fucntionaity should be located.  Further we
   define different MAC profiles based on currently known MAC
   implementations.  The WTP may support one or more pfofiles and will
   indicate the supported profiles to the AC.  The AC will select a
   profile and configure it the WTP.

2.  Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL","SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  IEEE MAC Profile Descriptions

   A IEEE MAC Profile refers to a description of a fucntional split
   between the WTP and AC s shown in Figure 1

3.1.  Split MAC Profile

   The functional split for the Split MAC profile is provided in Figure
   2.  The Split MAC profile is identical to the Split MAC mode defined
   in [RFC5416].  Description of various fucntionality is available in
   Section 2.2.1 of [RFC5416].


   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Functions                  | Split MAC |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Distribution Service     |   AC      |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Integration Service      |   AC      |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Beacon Generation        |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Probe Response Generation|   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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   | Function    |Power Mgmt               |   WTP     |
   +             |/Packet Buffering        |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Fragmentation            |   WTP/AC  |
   +             |/Defragmentation         |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Assoc/Disassoc/Reassoc   |   AC      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Classifying              |   AC      |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 QoS  |Scheduling               |   WTP/AC  |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Queuing                  |   WTP     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.1X/EAP          |   AC      |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 RSN  |RSNA Key Management      |   AC      |
   +  (WPA2)     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.11              |   WTP/AC  |
   +             |Encryption/Decryption    |           |
   |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                     Figure 2: Functions in Split MAC

3.2.  Local MAC Profile

   The functional split for the Local MAC profile is provided in Figure
   3.  The local MAC profile is identical to the Local MAC mode defined
   in [RFC5416].  Description of various fucntionality is available in
   Section 2.2.2 of [RFC5416].

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Functions                  | Local MAC |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Distribution Service     |   WTP/AC  |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Integration Service      |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Beacon Generation        |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Probe Response Generation|   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Function    |Power Mgmt               |   WTP     |
   +             |/Packet Buffering        |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Fragmentation            |   WTP     |
   +             |/Defragmentation         |           |



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   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Assoc/Disassoc/Reassoc   |   WTP/AC  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Classifying              |   WTP     |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 QoS  |Scheduling               |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Queuing                  |   WTP     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.1X/EAP          |   AC      |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 RSN  |RSNA Key Management      |   AC      |
   +  (WPA2)     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.11              |   WTP     |
   +             |Encryption/Decryption    |           |
   |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                     Figure 3: Functions in Local MAC

3.3.  Hybrid MAC Profile

   The functional split for the Hybrid MAC profile is provided in Figure
   4.  The Hybrid MAC is similar to the Split MAC except that scheduling
   is done only at the WTP, and IEEE 802.11 encryption/decryption is
   done at the WTP.  Note that the Split MAC profile allowed encryption
   to be either at the WTP or the AC.


   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            Functions                  | Hybrid MAC|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Distribution Service     |   AC      |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Integration Service      |   AC      |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Beacon Generation        |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Probe Response Generation|   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Function    |Power Mgmt               |   WTP     |
   +             |/Packet Buffering        |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Fragmentation            |   AC      |
   +             |/Defragmentation         |           |
   |             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Assoc/Disassoc/Reassoc   |   AC      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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   |             |Classifying              |   AC      |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 QoS  |Scheduling               |   WTP     |
   +             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |Queuing                  |   WTP     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.1X/EWTP         |   AC      |
   +   IEEE      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | 802.11 RSN  |RSNA Key Management      |   AC      |
   +  (WPA2)     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             |IEEE 802.11              |   WTP     |
   +             |Encryption/Decryption    |           |
   |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                     Figure 4: Functions in Hybrid MAC

3.3.1.  Hybrid-MAC model Frames Exchange

   An example of frame exchange using the proposed Hybrid-MAC Model
   shown in Figure 5.


   +-+-+-+-+-+-+               +-+-+-+-+-+                    +-+-+-+-+-+-+
   |    STA    |               |    WTP  |                    |    AC     |
   +-+-+-+-+-+-+               +-+-+-+-+-+                    +-+-+-+-+-+-+
         |                          |                               |
         |        Beacon            |                               |
         |<-------------------------|                               |
         |        Probe             |                               |
         |<------------------------>|                               |
         |              802.11 AUTH/Association                     |
         |<-------------------------------------------------------->|
         |                          |Station Configuration Request [|
         |                        Add Station (Station MAC Address),|
         |                        IEEE 802.11 Add Station (WLAN ID),|
         |                        IEEE 802.11 Session Key(Flag=A)]  |
         |                          |<------------------------------|
         |                          |                               |
         |                          |Station Configuration Response |
         |                          |------------------------------>|
         |       802.1X Authentication & 802.11 Key Exchange        |
         |<-------------------------------------------------------->|
         |                          |Station Configuration Request [|
         |                        Add Station (Station MAC Address),|
         |                        IEEE 802.11 Add Station (WLAN ID),|
         |                        IEEE 802.11 Station Session Key]  |
         |                          |<------------------------------|
         |                          |                               |



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         |                          |Station Configuration Response |
         |                          |------------------------------>|
         |                 802.11 Action Frames                     |
         |<-------------------------------------------------------->|
         |                DATA Frame Exchange                       |
         |    802.11 Data           |       802.11 or 802.3 Data    |
         |<-------------------------+------------------------------>|


                Figure 5: Hybrid-MAC model Frames Exchange

4.  IEEE 802.11 MAC Profile

   The IEEE 802.11 WTP Profile message element allows the WTP to
   communicate the profile it supports to the AC.  The Discovery Request
   message, Primary Discovery Request message, and Join Request message
   may include one such message element

        0               1               2               3
        0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0
       +=+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
       | Num_Profiles  |  Profile_1    |   Profile_[2..N]..
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

                     Figure 6: IEEE 802.11 MAC Profile

   o  Type: TBD for IEEE 802.11 MAC Profile
   o  Num_Profiles >=1: This refers to number of profiles presnt in this
      messaage element.  There must be at least one profile.
   o  Profile: Each profile is idnentified by a value as given below

      *  0: This refers to the Local MAC Profile described in
         Section 3.2
      *  1: This refers to the Split MAC Profile described in
         Section 3.1
      *  2: This refers to the Hybrid MAC Profile described in
         Section 3.3

5.  Security Considerations

   This document doesn't specify security risk difference from
   [RFC5416].  It could directly refer to Security section of [RFC5416]









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6.  IANA Considerations

   This document requires the following IANA actions.

   o  This specification defines a new message element, IEEE 802.11 MAC
      Profile.  The format of this option is described in Section 3.3.
      Type value for this option needs to be assigned from the same
      numbering space as allocated for the other IEEE 802.11 message
      elements as defined in [RFC5416] in the CAPWAP IEEE 802.11 Message
      Types sub-registry
   o  The Profile field in the IEEE 802.11 MAC Profile Type message
      element (see Figure 6) The namespace is 8 bits (0-255), where the
      value of zero (0) through two (2) are allocated in this
      specification, and can be found in Figure 6.  This namespace is
      managed by IANA and assignments require an Expert Review under the
      registry IEEE 802.11 MAC Profile for CAPWAP

7.  Contributors

   Yifan Chen chenyifan@chinamobile.com

   Naibao Zhou zhounaibao@chinamobile.com

8.  Acknowledgments

   The author thanks the kind advices from Dorothy Stanley in the
   development of this document.

   The efforts of Margaret Wasserman, Wes George in reviewing this
   document are gratefully acknowledged.

   Guidance from management team: Melinda Shore, Scott Bradner, Chris
   Liljenstolpe, Benoit Claise, Joel Jaeggli, Romascanu Dan are highly
   appreciated.

9.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4564]  Govindan, S., Cheng, H., Yao, ZH., Zhou, WH., and L. Yang,
              "Objectives for Control and Provisioning of Wireless
              Access Points (CAPWAP)", RFC 4564, July 2006.

   [RFC5415]  Calhoun, P., Montemurro, M., and D. Stanley, "Control And
              Provisioning of Wireless Access Points (CAPWAP) Protocol
              Specification", RFC 5415, March 2009.




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   [RFC5416]  Calhoun, P., Montemurro, M., and D. Stanley, "Control and
              Provisioning of Wireless Access Points (CAPWAP) Protocol
              Binding for IEEE 802.11", RFC 5416, March 2009.

Authors' Addresses

   Chunju Shao
   China Mobile
   No.32 Xuanwumen West Street
   Beijing  100053
   China

   Email: shaochunju@chinamobile.com


   Hui Deng
   China Mobile
   No.32 Xuanwumen West Street
   Beijing  100053
   China

   Email: denghui@chinamobile.com


   Rajesh S. Pazhyannur
   Cisco
   170 West Tasman Drive
   San Jose, CA 95134
   USA

   Email: rpazhyan@cisco.com


   Farooq Bari
   AT&T
   7277 164th Ave NE
   Redmond WA 98052
   USA

   Email: farooq.bari@att.com











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   Rong Zhang
   China Telecom
   No.109 Zhongshandadao avenue
   Guangzhou  510630
   China

   Email: zhangr@gsta.com


   Satoru Matsushima
   SoftBank Telecom
   1-9-1 Higashi-Shinbashi, Munato-ku
   Tokyo
   Japan

   Email: satoru.matsushima@g.softbank.co.jp



































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