Importance

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Abstract

In certain wireless communication systems, including at least some CDMA cellular systems, short messages can be delivered to mobile stations in a broadcast fashion using a common forward (downlink) channel sometimes referred to as the Paging Channel. Economy in the use of the Paging Channel can be achieved by using so-called slotted mode reception. In accordance with this mode, the infrastructure directs messages to a given mobile station only during time slots allocated to the particular group of mobile stations to which the given station belongs. These time slots recur according to a paging slot cycle having a specified length (expressed as a number of slots), or slot cycle index. Disclosed here is a further cycle, referred to as the Broadcast Paging Cycle, for use in implementing a service for broadcasting short messages (to many mobile stations). The Broadcast Paging Cycle has an index that is larger than, and incommensurable with, the paging slot cycle index. Any given broadcast message is transmitted only once during each Broadcast Paging Cycle, in a predetermined slot thereof. This predetermined slot will eventually coincide, in a non-preferential manner, with each slot of the paging slot cycle. Consequently, the load on the Paging Channel due to the broadcast service will be averaged uniformly over all paging slots.

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First Claim