You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
148 lines
3.0 KiB
148 lines
3.0 KiB
// bounded retransmission protocol [D'AJJL01]
|
|
// gxn/dxp 23/05/2001
|
|
|
|
dtmc
|
|
|
|
// number of chunks
|
|
const int N = 16;
|
|
// maximum number of retransmissions
|
|
const int MAX = 2;
|
|
|
|
// reliability of channels
|
|
const double pL;
|
|
const double pK;
|
|
|
|
// timeouts
|
|
const double TOMsg;
|
|
const double TOAck;
|
|
|
|
module sender
|
|
|
|
s : [0..6];
|
|
// 0 idle
|
|
// 1 next_frame
|
|
// 2 wait_ack
|
|
// 3 retransmit
|
|
// 4 success
|
|
// 5 error
|
|
// 6 wait sync
|
|
srep : [0..3];
|
|
// 0 bottom
|
|
// 1 not ok (nok)
|
|
// 2 do not know (dk)
|
|
// 3 ok (ok)
|
|
nrtr : [0..MAX];
|
|
i : [0..N];
|
|
bs : bool;
|
|
s_ab : bool;
|
|
fs : bool;
|
|
ls : bool;
|
|
|
|
// idle
|
|
[NewFile] (s=0) -> (s'=1) & (i'=1) & (srep'=0);
|
|
// next_frame
|
|
[aF] (s=1) -> (s'=2) & (fs'=(i=1)) & (ls'=(i=N)) & (bs'=s_ab) & (nrtr'=0);
|
|
// wait_ack
|
|
[aB] (s=2) -> (s'=4) & (s_ab'=!s_ab);
|
|
[TO_Msg] (s=2) -> (s'=3);
|
|
[TO_Ack] (s=2) -> (s'=3);
|
|
// retransmit
|
|
[aF] (s=3) & (nrtr<MAX) -> (s'=2) & (fs'=(i=1)) & (ls'=(i=N)) & (bs'=s_ab) & (nrtr'=nrtr+1);
|
|
[] (s=3) & (nrtr=MAX) & (i<N) -> (s'=5) & (srep'=1);
|
|
[] (s=3) & (nrtr=MAX) & (i=N) -> (s'=5) & (srep'=2);
|
|
// success
|
|
[] (s=4) & (i<N) -> (s'=1) & (i'=i+1);
|
|
[] (s=4) & (i=N) -> (s'=0) & (srep'=3);
|
|
// error
|
|
[SyncWait] (s=5) -> (s'=6);
|
|
// wait sync
|
|
[SyncWait] (s=6) -> (s'=0) & (s_ab'=false);
|
|
|
|
endmodule
|
|
|
|
module receiver
|
|
|
|
r : [0..5];
|
|
// 0 new_file
|
|
// 1 fst_safe
|
|
// 2 frame_received
|
|
// 3 frame_reported
|
|
// 4 idle
|
|
// 5 resync
|
|
rrep : [0..4];
|
|
// 0 bottom
|
|
// 1 fst
|
|
// 2 inc
|
|
// 3 ok
|
|
// 4 nok
|
|
fr : bool;
|
|
lr : bool;
|
|
br : bool;
|
|
r_ab : bool;
|
|
recv : bool;
|
|
|
|
|
|
// new_file
|
|
[SyncWait] (r=0) -> (r'=0);
|
|
[aG] (r=0) -> (r'=1) & (fr'=fs) & (lr'=ls) & (br'=bs) & (recv'=T);
|
|
// fst_safe_frame
|
|
[] (r=1) -> (r'=2) & (r_ab'=br);
|
|
// frame_received
|
|
[] (r=2) & (r_ab=br) & (fr=true) & (lr=false) -> (r'=3) & (rrep'=1);
|
|
[] (r=2) & (r_ab=br) & (fr=false) & (lr=false) -> (r'=3) & (rrep'=2);
|
|
[] (r=2) & (r_ab=br) & (fr=false) & (lr=true) -> (r'=3) & (rrep'=3);
|
|
[aA] (r=2) & !(r_ab=br) -> (r'=4);
|
|
// frame_reported
|
|
[aA] (r=3) -> (r'=4) & (r_ab'=!r_ab);
|
|
// idle
|
|
[aG] (r=4) -> (r'=2) & (fr'=fs) & (lr'=ls) & (br'=bs) & (recv'=T);
|
|
[SyncWait] (r=4) & (ls=true) -> (r'=5);
|
|
[SyncWait] (r=4) & (ls=false) -> (r'=5) & (rrep'=4);
|
|
// resync
|
|
[SyncWait] (r=5) -> (r'=0) & (rrep'=0);
|
|
|
|
endmodule
|
|
|
|
// prevents more than one file being sent
|
|
module tester
|
|
|
|
T : bool;
|
|
|
|
[NewFile] (T=false) -> (T'=true);
|
|
|
|
endmodule
|
|
|
|
module channelK
|
|
|
|
k : [0..2];
|
|
|
|
// idle
|
|
[aF] (k=0) -> pK : (k'=1) + 1-pK : (k'=2);
|
|
// sending
|
|
[aG] (k=1) -> (k'=0);
|
|
// lost
|
|
[TO_Msg] (k=2) -> (k'=0);
|
|
|
|
endmodule
|
|
|
|
module channelL
|
|
|
|
l : [0..2];
|
|
|
|
// idle
|
|
[aA] (l=0) -> pL : (l'=1) + 1-pL : (l'=2);
|
|
// sending
|
|
[aB] (l=1) -> (l'=0);
|
|
// lost
|
|
[TO_Ack] (l=2) -> (l'=0);
|
|
|
|
endmodule
|
|
|
|
label "error" = s=5;
|
|
|
|
rewards
|
|
[TO_Msg] true : TOMsg;
|
|
[TO_Ack] true : TOAck;
|
|
endrewards
|
|
|
|
|