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RE: [802.21] Start ACK requestor and responder state machines

Hi Ruben,

The setting of the MIH ACK bit should depend more on the type of
end-to-end transport protocol that you are using to communicate the two
MIH peers, than on the actual RF signal levels.

The following Internet-Draft (soon to become RFC) has some discussion
and recommendations on the topic:

I hope this helps.

Best regards,

Juan Carlos

-----Original Message-----
From: Ruben Gonzalez [mailto:ruben.gonzalez@ENTEL.UPC.EDU] 
Sent: Thursday, 19 March, 2009 2:56 PM
Subject: [802.21] Start ACK requestor and responder state machines

Hello everybody,

I am working on a master thesis about a wifi to wifi 802.21 handover
implementation and I was thinking about how to determine the AckReq and
AckRsp bits in in a MIH_MESSAGE header. I'm using Atheros wireless cards
which main parameter of quality is the RSSI. It is quite well
how to determine the signal level thresholds to proceed handover
(, but I am not being able to guess when should I
start to improve the channel's fiability by switching in the ACK

I have determined the following signal level thresholds, and the actions
to be taken:

Roaming threshold: -73dBm
- Link_Parameters_Report
- MIH_MN_HO_Candidate_Query
- MIH_MN_HO_Commit
- L2 Connection

Clear channel threshold: -89dBm
- Link_Going_Down
- L3 Handover

Link_Down threshold: -94dBm

Could anybody give me a clue about when to set AckReq and AckRsp bits?
I on the rigth way looking at this indicator (signal level)?

Thanks in advance.