Contributed by Yi-Bing Lin
in communication moves from one cell to another, a handover
radio link transfer process is required to re-connect the M-ES in
the new cell.
The CDPD transfer process is controlled by the M-ES as follows.
The M-ES monitors the
radio link quality. If the quality falls below the pre-defined thresholds
for the radio signal strength and error rates,
the M-ES initiates the link transfer process by searching a better quality
channel (a list of available channels are broadcast by the
The M-ES tunes to the new channel and informs the new MDBS that it has entered
the cell. The new MD-IS updates its
so that the future data for the M-ES are directed to the current cell.
If the old MDBS and the new MDBS connect to different
the transport layer retransmission is required to re-establish the end-to-end
JPL's Wireless Communication Reference Website © Yi-Bing
Lin (Author) and Jean-Paul M.G.
Linnartz (Ed.), 1996.