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7.0

Programming the protocol stack for GPRS/WLAN interconnection

Asked by rcamaren in General Packet Radio Service (GPRS)

Tags: gprs, programming, stack, protocol

Hi all,

I'm pursuing my Master in Communications and trying to decide on my thesis. I´m trying to establish a seamless roaming between GRPS and WLAN in a laptop (of course I would have a Wi-Fi card and a GPRS PCMCIA card). I mean, the laptop could access internet/email/... from both networks without loosing the session when roaming bw them.

I have read several docs in IEEE and 3GPP and think the best solution is to use a tight coupling approach, the WLAN acts as another RAN on the GPRS network. To achieve this, a IEEE document recommends to add a protocol called WAF (Wireless Adaptation Function) in the middle of the LLC and RLC/MAC layers. The WAF signals the activation of WLAN interface when entering a WLAN area. It also signals the change of RA to GMM, supports the paging procedure. etc.

I have read all the questions/answers posted here. Very helpful.

Some my questions are:
1. I haven't found a PCMCIA card for GPRS, anyone knows about one comercially available ?
2. Since I need to add the WAF layer, I could not use a current phone (because I cannot modify the protocol stack) so I need a internal GPRS modem so I can modify the stack of protocols in the laptop. Any recommendation about the best environment to do this I mean to use Linux (this way I only have to introduce my code for the WAF layer) or use some Active X alredy developed?
3. How does the IP assigment work in GPRS? Does my IP change when moving to another Routing Area or do I have the same IP all the time moving to other cells, Routing Areas?
4. This is becoming a big project, do you know any company, university or people working on this?

Any help is very welcomed.

View the Solution FREE for 30 Days

20091021-EE-VQP-81

Programming the protocol stack for GPRS/WLAN interconnection

Asked by rcamaren in General Packet Radio Service (GPRS)

Tags: gprs, programming, stack, protocol

About this solution