I think Pars' point is not restricted to L2 mechanisms, though. No matter what layer has to wake up a dormant host, bandwidth will be consumed at multiple base stations to achieve this?
Bert > -----Original Message----- > From: James Kempf [mailto:[EMAIL PROTECTED] > Sent: Wednesday, September 20, 2006 3:03 PM > To: Pars MUTAF > Cc: Erik Nordmark; ipv6@ietf.org > Subject: Re: Proposal to change aspects of Neighbor Discovery > > So here's a counter example. > > Suppose there is an IP based but wireless link layer specific > protocol that > lets BSes communicate about dormant mode hosts. When a host goes into > dormant mode, all BSes in the paging area learn about it via > the protocol. > When paging happens, this protocol is used by the BS where > the mobile node > originally went into dormant mode to notify other BSes to > page. Etc. That > should take care of filtering. > > Right now, paging is handled by L2 specific mechanisms. In > 3GPP, I think it > even depends on the MSC, i.e. the circuit switched part of > the network. > Bottom line is, other SDOs get to say how it works, not the IETF. > > jak > > > > ----- Original Message ----- > From: "Pars MUTAF" <[EMAIL PROTECTED]> > To: "James Kempf" <[EMAIL PROTECTED]> > Cc: "Erik Nordmark" <[EMAIL PROTECTED]>; <ipv6@ietf.org> > Sent: Wednesday, September 20, 2006 12:49 PM > Subject: Re: Proposal to change aspects of Neighbor Discovery > > > > Selon James Kempf <[EMAIL PROTECTED]>: > > > >> There is an assumption here that the "L2 paging system" is > run off the > >> AR. > >> This is not necesarily the case. It won't be for Wimax, > for example. > > > > Hello, > > OK. The discussion about Wimax now ;-) > > > > But this should be orthogonal to our problem. In paging, in general, > > the system (AR in this case) doesn't know where the dormant host is > > located. The mobile host is "asked" to report its exact location, > > i.e. cell. (This is what is meant by "paging"). > > > > *The BSs don't know anything about the dormant host*. The > host is paged > > in all cells of the paging area. That's why wireless > bandwidth needs to be > > consumed for paging in all cells of the paging area. (This > is a well-known > > problem of paging. 100s of research papers attempted to reduce this > > bandwidth cost.) > > > > Then, the host hears the paging message while sleeping in one of > > the cells, wakes up, and a location update is sent. > > > > The AR has now learned the current BS of the host. The packet that > > triggered paging is forwarded to the current BS of the host. > > > > Filtering of the RA by the BS is too late. Because the host was > > already paged in all cells and woken up. > > > > pars -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
