Thomas Kunz
Systems and Computer Engineering
20
CDPD: Intra-Area Cell Transfer
–intra-area
cell transfer: controlled by same MD-IS
–M-ES
initiates transfer if channel becomes bad (extended loss of channel
synchronization and/or unacceptable error rate)
–to assist
M-ES in locating CDPD channel, MDBS periodically broadcasts RF
channel number in use or as candidates for use in adjacent
cell
–after M-ES synchronized with new RF channel,
sends link-layer receive ready to serving MD-IS
–MD-IS
acknowledges frame and updates its information for M-ES
(physical media association)