Thomas Kunz
Systems and Computer Engineering
21
CDPD: Inter-Area Cell Transfer
–starts
out identical to intra-area cell transfer
–once
M-ES synchronized with new channel, mobile sends “end system hello”
(ESH) to new serving MD-IS
–ESH
informs MD-IS of presence of M-ES, register its address (NEI)
–new
serving MD-IS sends message to home MD-IS to tell it where data
for M-ES should be redirected
–home
MD-IS acknowledges if registration is successful
–new
serving MD-IS confirms successful registration to M-ES
–home
MD-IS “flushes” previous serving MD-IS, telling it that messages are
no longer forwarded for this M-ES