Re: [802.21] HLSI
On Tue, Sep 06, 2005 at 10:19:18AM -0700, Gupta, Vivek G wrote:
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> List of Networks Supported, Roaming_list_Availabale,
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> Neighbor_reports_Available is questionable as well.
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> [Vivek G Gupta]
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> Why are these questionable? These seem lot more promising from a
> handover policy perspective.
"List of Networks Supported" and "Neighbor_reports_Available" can be
integrated into Neighbor List (i.e., a list of neighboring PoAs) in
which network type is included in each PoA in the list. Similarly,
Roaming_list_Available should be Roaming List (i.e., a list of roaming
operators, not just a flag).
Yoshihiro Ohba
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> Network_Operator
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> could be improved to contain an IANA-assigned, global unique SMI
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> enterprise number as well as the name of the operator. Location could
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> be improved to carry RFC 3825 Location Configuration Information (just
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> having latitude and longitude is insufficient to represent a
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> geo-coordinate).
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> [Vivek G Gupta] Agree
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> > The media dependent IEs currently include:
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> >
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> > { Cipher_Suites, Authentication_Methods, Cost (free/not free),
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> > IP_Version, Data_Rates, QoS, Neighbor_Maps }
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> In my analysis, Cipher_Suites, Authentication_Methods, Data_Rates, QoS
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> are questionable.
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> [Vivek G Gupta]
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> Again why?
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> Knowledge of security (supported or not), availability of QoS and
> supported data rates can influence selecting PoA decisions.
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> I agree on representing Cost as a binary value
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> (free or not free).
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> > We could use a basic TLV format to represent these, along with a
> simple
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> > mechanism to query or set the values,
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> >
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> > of different IEs, so not sure why we really need a basic schema and an
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> > extended schema and all the other baggage along with it.
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> I am currently defining TLV format for IEs defined in basic set. I
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> think the IEs defined in basic set should be able to be queried using
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> not only XML but also TLV. On the other hand, I do believe schemas
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> (basic schema and extended schema) are needed to support extensibility
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> to deal with any link-layer technologies including the existing ones
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> and future ones as well as to make flexible and efficient information
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> queries.
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> [Vivek G Gupta]
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> Why cannot extensibility be supported with a basic TLV type format?
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> You can always query for list of supported networks and supported
> capabilities and go from there.
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> In any case would like to see more focus on definition/identification of
> appropriate IEs across different networks.
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> After the July meeting, I did qualitative analysis on the
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> applicability of XML/RDF to 802.21 information service and the
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> analysis result will be described in my another contribution prepared
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> for the September meeting, which is a white paper about 802.21
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> information service using XML/RDF technologies.
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> [Vivek G Gupta]
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> Great!
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> We also need draft text for the 802.21 specification and need to clean
> up the Information Services section as well.
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> I really want to settle on all of those basic issues on information
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> service in the September meeting.
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> [Vivek G Gupta]
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> Fantastic! Lemme know how I can help
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> Best regards,
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> Yoshihiro Ohba
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> >
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> >
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> >
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> > Best Regards,
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> >
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> > -Vivek
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> >
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> >
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> >
>
> > -----Original Message-----
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> > From: stds-802-21@ieee.org [mailto:stds-802-21@ieee.org] On Behalf Of
>
> > Yoshihiro Ohba
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> > Sent: Monday, September 05, 2005 8:59 PM
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> > To: stds-802-21@listserv.ieee.org
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> > Subject: HLSI
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> >
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> >
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> >
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> > I am currently writing up a contribution to revise Information Service
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> >
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> > sections and I have the following questions:
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> >
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> >
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> > The HLSI IE defines several flags indicating the available
> higher-layer
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> > services including ISP, MMS, IMS, MIP, VPN, SIP and NAT.
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> >
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> >
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> >
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> > - What is the exact meaning of "VPN support"? Does it mean that if
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> >
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> > you connect to the PoA then all data traffic will be automatically
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> >
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> > forwarded to some remote network over a dedicated tunnel between the
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> >
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> > PoA and the remote network? Or does it mean that the network provides
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> >
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> > a VPN gateway? Or does it mean that the mobile terminal connected to
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> >
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> > the PoA can establish a VPN connection to any VPN gateway. Or
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> >
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> > something else? The first definition does not make sense because you
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> >
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> > will need additional information about the remote network to make a
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> >
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> > handover decision. The latter two definitions do not make sense
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> >
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> > either, because there are several different ways of establishing a VPN
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> >
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> > connection (i.e., IPsec, SSL, L2TP, PPTP, etc.) and you will need
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> >
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> > additional information as to which VPN method is used to make a
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> >
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> > handover decision.
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> >
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> >
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> >
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> > - What is the exact meaning of "SIP support"? Does it mean that the
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> >
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> > network has a SIP server or proxy, or something else?
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> >
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> >
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> >
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> > - Do we really need HLSI IE defined in the basic set? I think it can
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> >
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> > be defined in extended set. This is because we might need more
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> >
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> > detailed information about higher-layer (such as IP addresses and
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> >
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> > prefixes of access routers, supported IP mobility optimization
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> >
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> > mechanism, list of supported ISPs, etc.) to make a higher layer
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> >
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> > information and just defining a set of flags seems like a half-baked
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> >
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> > solution. Such detailed information can be provided via schema-based
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> >
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> > query by which various higher-layer (and lower-layer) MIB objects can
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> >
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> > be retrieved once converted to RDF data.
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> >
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> >
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> >
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> > Regards,
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> >
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> >
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> >
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> > Yoshihiro Ohba
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> >
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