CDPD Mobile Data Base Station (MDBS)
Contributed by Yi-Bing Lin
The MDBS is responsible for detailed control of the radio interface, such as
radio channel allocation, interoperation with cellular voice channel usage
and radio media access control.
A MDBS consists of several modem-transceivers each of them supports one
channel pair. The user data received by the modem-transceivers are
processed by the control computers before being delivered to the
- In order to share radio resources with the cellular system,
MDBSs are expected to be co-located with the voice equipments that provide
cellular telephone service.
- Furthermore, MDBSs may share cellular equipments (such as antennas for
transmitters and receivers) to communicate with the
- M-ESs can only communicate with the outside world through MDBSs. There
is no direct communication path between M-ESs.
- Because of the short synchronization delay (i.e., two bit delay) between
the MDBS and the M-ES, the radius of a CDPD is typically limited to less than
JPL's Wireless Communication Reference Website © Yi-Bing
Lin (Author) and Jean-Paul M.G.
Linnartz (Ed.), 1996.