diff options
Diffstat (limited to 'doc/sequence_charts/inter_bsc_ho.msc')
| -rw-r--r-- | doc/sequence_charts/inter_bsc_ho.msc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/doc/sequence_charts/inter_bsc_ho.msc b/doc/sequence_charts/inter_bsc_ho.msc new file mode 100644 index 000000000..2bc1276ef --- /dev/null +++ b/doc/sequence_charts/inter_bsc_ho.msc @@ -0,0 +1,36 @@ +msc { + hscale=2; + bsca [label="BSC-A"], i[label="MSC-I"], a[label="MSC-A"], t[label="MSC-T"], bscb[label="BSC-B"]; + + i note t [label="'MSC-A,I,T' are explained in 3GPP TS 49.008 '4.3 Roles of MSC-A, MSC-I and MSC-T'"]; + i note i [label="I = Internal; the MSC that does BSSMAP to the BSC (may change to a remote MSC-B after HO)"]; + a note a [label="A = first; the MSC that has MM control BSSMAP to the BSC (never changes)"]; + t note t [label="T = transitory; the MSC that a handover is going towards (may be MSC-A for inter-BSC HO, may be a remote MSC-B)"]; + + bsca => i [label="BSSMAP Handover Required"]; + i -> a [label="BSSMAP Handover Required"]; + + a -> t [label="MAP Prepare Handover"]; + t => bscb [label="BSSMAP Handover Request"]; + t <= bscb [label="BSSMAP Handover Request ACK"]; + a <- t [label="MAP Prepare Handover Response"]; + i <- a [label="MAP Prepare Handover Response"]; + bsca <= i [label="BSSMAP Handover Command"]; + + --- [label="MS sends RACH to new cell"]; + + t <= bscb [label="BSSMAP Handover Detected"]; + a <- t [label="MAP Access Signaling Request"]; + + t <= bscb [label="BSSMAP Handover Complete"]; + a <- t [label="MAP Send End Signal"]; + + + a abox a [label="MSC-A accepts the new BSC"]; + i note t [label="previous MSC-I gets dropped, MSC-T becomes the new MSC-I"]; + i abox i [label="discard"]; + t abox t [label="MSC-I"]; + + bsca <= i [label="BSSMAP Clear Command"]; + +} |