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Packet Roaming Phase 2 --- For discussion --- February 27, 2002 Masaaki Koga ([email protected])

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Packet Roaming Phase 2 --- For discussion --- February 27, 2002 Masaaki Koga ([email protected]) Masaru Fukumitsu ([email protected]) KDDI Corporation. Phase 1. Requirements WAP Connectivity to Home Gateway Internet Access via Serving Network

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slide1

Packet Roaming Phase 2

--- For discussion ---

February 27, 2002

Masaaki Koga ([email protected])

Masaru Fukumitsu ([email protected])

KDDI Corporation

CDG International Roaming Team Meeting in Tokyo

slide2

Phase 1

  • Requirements
    • WAP Connectivity to Home Gateway
    • Internet Access via Serving Network
    • Bilateral Solution (Architecture, Billing)
    • To solve the IP address conflict
    • MIN based billing
    • Circuit Data and/or Packet Data

Phase 1 document has been almost completed.

CDG International Roaming Team Meeting in Tokyo

slide3

Phase 2

  • - Requirements
    • WAP Connectivity to Home Gateway
    • Internet Access via Serving Network
    • Home ISP / Corporate VPN Access
    • Connection with multi-roaming partners
    • Common Solution (Architecture, Billing)
    • To solve the IP address conflict
    • MIN/IMSI based Billing
    • Packet Data

Requirements above has been already captured in the baseline document of Phase 1.

CDG International Roaming Team Meeting in Tokyo

slide4

Figure: Why PAP or CHAP is required

ISP server

Billing Server

WAP server

Corporate server

CDMA carrier A

IP Network

CDMA carrier B

Carrier B cannot get the charge.

Packet network

User of carrier A

Packet Data

Billing Data

CDMA carrier C

CDG International Roaming Team Meeting in Tokyo

slide5

Either PAP or CHAP is required in the Phase 2.

Study item

- The PAP or CHAP can be implemented in all the handsets?

- The serving system can support both PAP and CHAP?

CDG International Roaming Team Meeting in Tokyo

slide6

How to solve the IP address conflict

There are four solutions:

(1) Pooling Private IP addresses for WAP session which has no conflict between two carriers and allocating global IP address for the RADIUS and WAP G/W. (DNS may be used to get the IP address for the RADIUS and WAP G/W.)

No flexibility

Concern about the number of required global IP addresses

(2) Full global IP address network

Not feasible

(3) Full IPv6 address network

Not feasible

(4) Tunneling

Flexible

CDG International Roaming Team Meeting in Tokyo

slide7

Tunneling: Method 1

RADIUS

Contents

Network

GW

(LNS)

Home network

Serving Network

L2TP Tunnel

PDSN

IWF

(LAC)

: Datagrams Route

: Account Packets Route

: Auth Packets Route

Tunneled portion

CDG International Roaming Team Meeting in Tokyo

slide8

Tunneling: Method 2

RADIUS

Contents

Network

GW

Home Network

Serving Network

GW

Tunnel

PDSN

IWF

: Datagrams Route

: Account Packets Route

: Auth Packets Route

Tunneled portion

CDG International Roaming Team Meeting in Tokyo

slide9

Choice of Method 1 or 2

  • Some carriers prefer Method 1 and others prefer Method 2. It will be difficult to choose one as our CDMA community.
  • Two Methods should be allowed in the CDG specification and carriers will choose one bilaterally. The choice may not be symmetric. For example between Carrier A and Carrier B, it is viable that Carrier A terminates tunneling in their network and Carrier B established tunneling to Carrier A.

CDG International Roaming Team Meeting in Tokyo

slide10

Distribution of authentication packet (Example)

Serving Network

[email protected]@kddi

Distribution function

[email protected]@tnz

Network B user

Network C user

[email protected]@skt

Network A user

[email protected]

[email protected]

[email protected]

Network A

Network B

Network C

CDG International Roaming Team Meeting in Tokyo

slide11

How to distribute authentication packets to home network

Assumptions

- Authentication packet is distributed by checking the user name.

- The user name includes domain name

- The number of contracted home ISP and corporate VPN users will increase day by day.

CDG International Roaming Team Meeting in Tokyo

slide12

Proposals

Proposal 1 - Putting a suffix in the handset -

<cdmaone>@<au-net.ne.jp>@<kddi>

(1) (2) (3)

(1) User ID. To be used for user authentication.

(2) Optional. To be used for routing within the home network.

(3) Suffix. To be used for routing from the serving network to the home network. The serving network shall delete the suffix.

Proposal 2

Domain names are programmed in the serving system in response to the request from home network.

CDG International Roaming Team Meeting in Tokyo

slide13

Next work - Interoperability -

Interoperability of the following messages should be studied among our CDMA carriers.

- RADIUS Access Request

- RADIUS Account Request

- L2TP

CDG International Roaming Team Meeting in Tokyo

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