- •Introduction
- •Fast Connect Services
- •Basic Algorithm
- •1-Slot Discovery
- •Simple Message Profile
- •Message Profile Rules for Fixed Initiators
- •Default parameters for operation at 115.2 kbps
- •Message Profile Rules for Responders
- •Precise Description of Fast Connect Procedure
- •State Chart
- •State Definitions
- •Event Descriptions
- •Action Descriptions
- •Auto-detect of 9600 bps and 115.2 kbps
IrLAP Fast Connect |
Version 1.0 |
3.5Message Profile Rules for Responders
A message profile defined by a fixed initiator may send a number of commands and allow a number of responses. A responder is not required to respond to all commands nor utilize all responses. Responders that only respond to a 1-slot XID command with an XID response are legal. However, responding to the other commands and utilizing the other responses will usually result in establishing an IrLAP connection faster. Responders must follow the rules given below.
1.A responder must begin its response within 10ms of receiving the command frame.
2.If responding at 9600 bps with an IrLAP frame, the responder must send 10 XBOFs at he beginning of the response as required in the IrLAP specification version 1.1.
3.If responding at 115.2 kbps with an IrLAP frame, the responder must not send any XBOFs but must begin its response with a single BOF (0xC0)
4.When listening at 115.2 kbps the responder should following the auto-detect procedure described in section 5 “Auto-detect of 9600 bps and 115.2 kbps”.
4 Precise Description of Fast Connect Procedure
4.1State Chart
Current |
Event |
Action(s) |
Next |
State |
|
|
State |
NDM |
Fast-Connect-Request(Pi) |
send Discovery-XID-Cmd: one |
QUERYF |
(entry |
|
ProfileI = Pi |
|
state) |
|
start-slot-timer |
|
|
|
log := { } |
|
|
Set-Fast-Connect- |
Change Speed to ProfileI listen speed |
|
|
if mode = True then |
NDM |
|
|
Mode(mode,Pr) |
ProfileR = Pr |
|
|
|
FastConMode = True |
|
|
|
Change Speed to ProfileR listen |
|
|
|
speed |
|
|
|
else |
|
|
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FastConMode = False |
|
|
Recv ProfileR allowed |
Change Speed to 9600 bps |
|
|
Change Speed to ProfileR speed |
NRM(S) |
|
|
Packet |
Negotiate-Connection-Parameters(def) |
|
|
FastConMode = True |
Initialize-Connection-State |
|
|
^ ProfileR response = UA |
send u:ua:rsp:F |
|
|
|
Apply-Connection-Parameters |
|
|
Recv ProfileR allowed |
start-WD-time |
|
|
Change Speed to ProfileR speed |
REPLYF |
|
|
Packet |
Send Discovery-XID-Rsp |
|
|
FastConMode = True |
Start-query-timer |
|
|
^ ProfileR response = |
Change Speed to ProfileR listen speed |
|
|
XID |
|
|
|
Recv ProfileR allowed |
Change Speed to ProfileR speed |
SSETUPF |
|
Packet |
Generate-Random-ConnectionAdr(ca) |
|
|
FastConMode = True |
send u:snrm:cmd:P:ca:NA |
|
|
^ ProfileR response = |
start-P-timer |
|
|
SNRM |
Change Speed to ProfileR listen speed |
|
10
IrLAP Fast Connect |
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Version 1.0 |
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Recv ProfileR allowed |
|
Perform non-IrLAP protocol response |
|
State for |
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|
|
|
|
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||||
|
Packet |
|
|
|
non- |
|
|
|
FastConMode = True |
|
|
|
IrLAP |
|
|
|
^ ProfileR response = |
|
|
|
protocol |
|
|
|
non-IrDA packet |
|
|
|
|
|
|
|
Recv x:x:x:x |
|
Follow normal NDM state machines |
|
See other |
|
|
|
FastConMode = False |
|
|
|
NDM |
|
|
|
|
|
|
|
state |
|
|
|
|
|
|
|
machins |
|
|
QUERYF |
slot-timer-expired |
|
if ProfileI(state) = send XID9600 then |
|
QUERYF |
|
|
|
|
|
Change Speed to 9600bps |
|
|
|
|
|
|
|
send Discovery-XID-Cmd: one |
|
|
|
|
|
|
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log := { } |
|
|
|
|
|
|
|
else |
|
|
|
|
|
|
|
Change Speed to ProfileI speed |
|
|
|
|
|
|
|
send ProfileI frame |
|
|
|
|
|
|
|
ProfileI(nextState) |
|
|
|
|
|
|
|
start-slot-timer |
|
|
|
|
|
|
|
Change speed to ProfileI listen speed |
|
|
|
|
|
Last-slot-timer-expired |
|
|
|
|
|
|
|
|
Discovery-Indication(log) |
|
SETUPF |
|
||
|
|
|
Send SNRM (sa from log) |
|
|
|
|
|
|
|
start-F-timer |
|
|
|
|
|
RecvDiscovery-XID- |
|
Change Speed to 9600bps |
|
QUERYF |
|
|
|
Rsp:sa,info at 9600bps |
|
send End-Discovery-XID-Cmd |
|
|
|
|
|
|
|
start-last-slot-timer |
|
|
|
|
|
|
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log := log { <sa,info> } |
|
|
|
|
|
|
|
|
|
|
|
|
|
Recv ProfileI UA |
|
stop-slot-timer |
|
NRM(P) |
|
|
|
Response |
|
Initialize-Connection-State |
|
|
|
|
|
|
|
Negotiate-Connection-Parameters(def) |
|
|
|
|
|
|
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Apply-Connection-Parameters |
|
|
|
|
|
|
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Fast-Connect-Confirm |
|
|
|
|
|
|
|
send s:rr:cmd:P |
|
|
|
|
|
|
|
start-F-timer |
|
|
|
|
|
Recv ProfileI XID |
|
Change Speed to profile speed |
|
SETUPF |
|
|
|
Response(sa) |
|
Send SNRM (sa) |
|
|
|
|
|
|
|
Change speed to ProfileI listen speed |
|
|
|
|
|
|
|
start-F-timer |
|
|
|
|
|
Recv ProfileI SNRM |
|
Fast-Connect-Indication |
|
NRM(S) |
|
|
|
Command |
|
Negotiate-Connection-Parameters |
|
|
|
|
|
|
|
Initialize-Connection-State |
|
|
|
|
|
|
|
Change Speed to profile speed |
|
|
|
|
|
|
|
send u:ua:rsp:F |
|
|
|
|
|
|
|
Apply-Connection-Parameters |
|
|
|
|
|
|
|
start-WD-timer |
|
|
|
|
|
Recv ProfileI non-IrLAP |
|
Perform non-IrLAP protocol |
|
State for |
|
|
|
Response |
|
initialization |
|
non- |
|
|
|
|
|
|
|
IrLAP |
|
|
|
|
|
|
|
protocol |
|
|
|
Recv x:x:x:x |
|
Empty |
|
QUERYF |
|
|
REPLYF |
Recv End-Discovery-XID- |
|
stop-query-timer |
|
REPLYF |
|
|
|
Cmd |
|
Discovery-Indication(remote) |
|
|
|
|
|
|
|
start-query-timer |
|
|
|
|
11
IrLAP Fast Connect |
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Version 1.0 |
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Recv u:snrm:cmd:P:c:d |
Fast-Connect-Indication |
NRM(S) |
|
|
|
Negotiate-Connection-Parameters |
|
|
|
|
Initialize-Connection-State |
|
|
|
|
Change Speed to ProfileR speed |
|
|
|
|
send u:ua:rsp:F |
|
|
|
|
Apply-Connection-Parameters |
|
|
|
|
start-WD-timer |
|
|
|
query-timer-expired |
Empty |
NDM |
|
|
Recv x:x:x:x |
Empty |
REPLY |
|
SSETUPF |
P-timer-expired |
Disconnect-Indication |
NDM |
|
|
recv u:ua:rsp:F |
stop-P-timer |
NRM(P) |
|
|
|
Initialize-Connection-State |
|
|
|
|
Negotiate-Connection-Parameters |
|
|
|
|
Apply-Connection-Parameters |
|
|
|
|
Fast-Connect-Confirm |
|
|
|
|
send s:rr:cmd:P |
|
|
|
|
start-P-timer |
|
|
|
recv x:x:x:x |
Empty |
SSETUP |
|
SETUPF |
F-timer-expired |
Disconnect-Indication |
NDM |
|
|
recv u:ua:rsp:F |
stop-F-timer |
NRM(P) |
|
|
|
Initialize-Connection-State |
|
|
|
|
Negotiate-Connection-Parameters |
|
|
|
|
Apply-Connection-Parameters |
|
|
|
|
Fast-Connect-Confirm |
|
|
|
|
send s:rr:cmd:P |
|
|
|
|
start-F-timer |
|
|
|
recv x:x:x:x |
Empty |
SETUPF |
|
4.2State Definitions
NDM. The station is in the normal disconnected mode. It can initiate or respond to local and remote requests to connect with a remote peer layer, it can initiate or respond to local and remote discovery and address resolution procedure requests.
QUERYF. The local layer is currently executing the discovery procedure. It has transmitted a 1-slot discovery XID command frame and is waiting for a response that matches its message profile.
REPLYF. A 1-slot XID discovery command frame has been received from a remote peer layer. An XID response has been sent. The local layer is waiting for a SNRM frame. If it receives an the final XID command frame indicating the end of discovery it will send an indication to the upper layer.
SSETUPF. The local layer has transmitted a SNRM command frame to a remote peer layer that earlier issued a sniff-XID-response frame and is awaiting a reply.
SETUPF. The local layer has transmitted a SNRM command frame to a remote peer layer and is awaiting a reply.
NRM(P). The station is in the normal response (connected) mode playing the primary role.
NRM(S). The station is in the normal response (connected) mode playing the secondary role.
State for non-IrLAP protocol. The station supports both IrDA and non-IrDA protocols and is branching to the non-IrDA state machine.
12
IrLAP Fast Connect |
Version 1.0 |
4.3Event Descriptions
Fast-Connect-Request(Pi). The service user has requested a fast connect procedure be initiated using the Initiator Profile Pi. The Pi profile specifies the command message sequence, allowed responses and the transmit/listen speeds.
Set-Fast-Connect-Mode(mode,Pr). The service user has requested that the IrLAP layer change the NDM state machine. If mode is true then enter into a fast connect listen mode using profile Pr. The Responder Profile (Pr) specifies the command messages to listen for, the allowed response(s), the listen/respond speed, and the number of times to retry failed response attempts before responding to the required XID message at 9600bps. If mode is false then use the standard NDM state machine.
Recv ProfileR allowed Packet. A packet that matches the allowed commands as specified in the responder (Pr) profile has been received.
FastConMode = True. The IrLAP layer is currently in fast connect listen mode (using the Fast Connect state machine).
ProfileR response = UA. The Responder Profile specifies that the response is an UA frame.
ProfileR response = XID. The Responder Profile specifies that the response is an XID frame.
ProfileR response = SNRM. The Responder Profile specifies that the response is a SNRM frame.
ProfileR response = non-IrDA packet. The Responder Profile specifies that the response is a non-IrDA packet.
Recv x:x:x:x Indicates the event “receive any frame addressed to this station that has not been specifically enumerated for this state”.
FastConMode = False The variable FastConMode is equal to False which means use the standard IrLAP NDM state machines.
slot-timer-expired The slot timer has expired.
Last-slot-timer-expired The timer used to time the final XID in a standard 1-slot discovery has expired. This event indicates that the final XID has been sent so a SNRM can then be sent.
RecvDiscovery-XID-Rsp:sa,info at 9600bps An XID response to the 1-slot XID command has been received at 9600 bps. This is the normal response to a 1-slot discovery and indicates to the initiator that it should send the final XID and then a SNRM at 9600 bps.
Recv ProfileI UA Response Received an UA response frame at a valid speed as allowed by the Initiator profile.
Recv ProfileI XID Response(sa) Received a XID response frame at a valid speed as allowed by the Initiator profile.
Recv ProfileI SNRM Command Received a SNRM command frame at a valid speed as allowed by the Initiator profile.
Recv ProfileI non-IrLAP Response Received a non-IrLAP packet at a valid speed as allowed by the Initiator profile.
Recv End-Discovery-XID-Cmd Received the final XID command frame of a 1-slot discovery.
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