A method of paging a mobile terminal in a radio access network wherein the
last known location of a mobile terminal is stored. A location message
(also called a Route Update message) is sent from a terminal and received
at a sector in the network, identifying the location of the terminal. The
network determines a paging zone for that terminal based on configuration
information for that sector. The configuration information for each
sector typically includes a Route Update radius, and then one or both of
a paging zone radius offset, and statically configured sectors. When the
terminal needs to be paged, the network then broadcasts a page to the
terminal in each sector in the paging zone. Such a system adjusts the
paging zone to include sectors which the terminal has a reasonable
likelihood of moving to before the network learns that the terminal has
moved out of the previously established paging zone. Aspects of the
invention provide two complementary methods of adjusting the paging zone:
adjusting using a paging zone offset, and adjusting based on a sector
list. The paging zone offset adjusts the radius of the paging zone,
thereby maintaining a generally circular shape. The sector list adjusts
the generally circular paging zone by adding or deleting any sector in
any direction, thereby allowing any arbitrary shape to be used for the
paging zone. The adjustments to the paging zone achieved by these methods
account for such factors as RF coverage, geographic features, congestion,
population density and expected rate of movement of terminals between
sectors.