Dispatch call origination and set up in a CDMA mobile communication system
First Claim
1. A method of setting up a dispatch call to a target mobile communication device over a code division multiple access (CDMA) air interface, comprising:
- receiving a page notification from a fixed equipment network at the target mobile communication device, the page notification including a dispatch notification;
transmitting a page response from the target mobile communication device to the fixed equipment network, the page response including a pilot power measurement; and
if the pilot power measurement indicates a power level above a preselected threshold, transmitting a talk permission message to an originating CDMA mobile communication device from the fixed equipment network;
wherein the talk permission message is transmitted to the originating CDMA mobile communication device before a traffic channel between the originating CDMA mobile communication device and the fixed equipment network is set up.
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Accused Products
Abstract
In a CDMA wireless communication system (200) a dispatch call can be established between two CDMA mobile stations (202, 226), or between other mobile stations and the CDMA mobile station, or between a CDMA mobile station and a computer (236) located outside of the wireless system. To reduce the delay normally association with call set up in a CDMA system, a dispatch processing network (128, 144) is provided in addition to a telephony switch (118). Dispatch calls and call set up requests are routed to the dispatch processing network from the radio access network (110) which includes base stations (204, 206). Once a dispatch call request is made, while the dispatch processing network begins setting up a traffic channel for the originating mobile communication device, the target is also paged, and upon responding, set up on a traffic channel. The concurrence of establishing radio links with the target and originating communication devices substantially reduces dispatch call set up time.
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Citations
15 Claims
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1. A method of setting up a dispatch call to a target mobile communication device over a code division multiple access (CDMA) air interface, comprising:
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receiving a page notification from a fixed equipment network at the target mobile communication device, the page notification including a dispatch notification; transmitting a page response from the target mobile communication device to the fixed equipment network, the page response including a pilot power measurement; and if the pilot power measurement indicates a power level above a preselected threshold, transmitting a talk permission message to an originating CDMA mobile communication device from the fixed equipment network; wherein the talk permission message is transmitted to the originating CDMA mobile communication device before a traffic channel between the originating CDMA mobile communication device and the fixed equipment network is set up. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of setting up a dispatch call between an originating code division multiple access (CDMA) mobile communication device and a target CDMA mobile communication device, comprising:
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transmitting a dispatch call origination message from the originating CDMA mobile communication device to a fixed equipment network over a CDMA channel, the dispatch call origination message containing a target identifier corresponding to the target CDMA mobile communication device; in response to the transmitting, initiating the set up of a traffic channel between the originating CDMA mobile communication device and the fixed equipment network; paging the target CDMA mobile communication device from the fixed equipment network; receiving a page response from the target CDMA mobile communication device at the fixed equipment network, the page response including a pilot power measurement made by the target CDMA mobile communication device; and in response to transmitting the page response, transmitting a talk permission message to the originating CDMA mobile communication device from the fixed equipment network if the pilot power measurement is above a preselected threshold; wherein the talk permission message is transmitted to the originating CDMA mobile communication device before the traffic channel between the originating CDMA mobile communication device and the fixed equipment network is set up. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification