Patent ID: 9474090
Filing Date: 2016-10-18
CPC Classification: H04W

Claim Text:
1. A method for improved resource allocation at a Project 25 (P25) push-to-talk (PTT) server in a P25 system for calls arriving via an Inter Radio Frequency Subsystem Interface (ISSI), comprising: receiving, at the P25 PTT server via an ISSI network to network interface (NNI) of the P25 PTT server, an ad hoc group call from another PTT system directed to a plurality of P25 subscriber units, the call arriving at the ISSI NNI as a plurality of call legs; determining, across the plurality of call legs, that the ad hoc group call received via the plurality of call legs is a single logical call for the plurality of P25 subscriber units; and allocating a single channel at each of one or more P25 sites for the plurality of P25 subscriber units for receiving the single logical call, such that a number of channels allocated across the one or more P25 sites is less than a number of the call legs received at the ISSI NNI.