Hello Bill See answers below.
Regards Hannu >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf >Of ext William Herrin >Sent: Wednesday, March 12, 2008 23:44 >To: Flinck Hannu (NSN - FI/Espoo) >Cc: [email protected] >Subject: Re: [RRG] Re: Supposed impossibility of scaling for mobility > >On Wed, Mar 12, 2008 at 3:00 PM, <[EMAIL PROTECTED]> wrote: >> Routing and mobility act on different time scales. 5 - 10s handovers >> are not acceptable in any working system. \ > >Hi Hannu, > >Is "handover" a necessary part of a mobility system? > Yes. Otherwise it is not a mobile system, but wireless extension of fixed access. Right? >What about an add/drop model where a mobile device adds a new >base station when it comes into range and later drops an old >base station that's leaving range? Not sure what do you mean by adding a base station. Do you mean that mobile device discovers a base station and adds that into its own configuration? Or does the terminal itself become a base station starting to offer services to others? Or adds the base station to the global mapp encap database. Is it impossible to design >a system where the mobile device can normally determine 10 >seconds ahead of time that its leaving the coverage area of a >given base station? Proactive solutions have their limitations. It depends on the cell size and speed of the MS. Also how do the cell sizes overlap if not at all. Moreover the mobile node needs to know about the network coverage. There have been various dynamic solutions to learn the coverage and neighboring base stations, but as far as I know no-one is using them. Need a mobile station receive on only one >channel at a time? > No, but this depends the type of the radio and the coding used. But how do these questions relate to the scalability and how the mapping data is distributed? >Regards, >Bill Herrin > > > >-- >William D. Herrin [EMAIL PROTECTED] [EMAIL PROTECTED] >3005 Crane Dr. Web: <http://bill.herrin.us/> Falls Church, VA >22042-3004 > -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
