This paper presents a novel location management technique,
         HOPPER, that is designed to support in a scalable and effcient
         manner non-geographical (lifelong) personal numbers in Personal
         Communications Services Performance comparisons between our
         scheme and previous schemes are derived from large scale
         simulations using a realistic traffc modeling framework for
         the ten largest cities of the United States. Results show that,
         in addition to inherently providing non-geographical numbers, the
         proposed scheme significantly improves lookup performance and
         requires relatively little database access and network signaling
         resources.