U. Madhow et al., OPTIMIZATION OF WIRELESS RESOURCES FOR PERSONAL COMMUNICATIONS MOBILITY TRACKING, IEEE/ACM transactions on networking, 3(6), 1995, pp. 698-707
In personal communications applications, users communicate via wireles
s with it wireline network. The wireline network tracks the current lo
cation of the user, and can therefore route messages to a user regardl
ess of the user's location, In addition to its impact on signaling wit
hin the wireline network, mobility tracking requires the expenditure o
f wireless resources as well, including the power consumption of the p
ortable units carried by the users and the radio bandwidth used for re
gistration and paging, Ideally, the mobility tracking scheme used for
each user should depend on the user's call and mobility pattern, so th
e standard approach, in which all cells in a registration area are pag
ed when a cap arrives, may be wasteful of wireless resources, In order
to conserve these resources, the network must have the capability to
page selectively within a registration area, and the user must announc
e his or her location more frequently, In this paper, we propose and a
nalyze a simple model that captures this additional flexibility. Dynam
ic programming is used to determine an optimal announcing strategy for
each user, Numerical results for a simple one-dimensional mobility mo
del show that the optimal scheme may provide significant savings when
compared to the standard approach even when the latter is optimized by
suitably choosing the registration area size on a per-user basis, Ong
oing research includes computing numerical results for more complicate
d mobility models and determining how existing system designs might be
modified to incorporate our approach.