Method and system for transmit frequency hopping
AssigneeMotorola, Inc.
InventorScott A. Fudally
Life of this patent
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Abstract
A mobile device (110) and combined method (400/500) for frequency hopping is provided. The frequency hopping can combine a receive scanning (400) with a scanning (500) for a transmit frequency for providing automated channel selection. The transmit scanning can include determining whether a push to talk (PTT) is pressed (501), and selecting a transmit frequency from a set of frequency channels (130) based on a measured activity (150) on the set of frequencies. If the PTT (240) is within the hang-time (504), a frequency that is currently active during the hangtime can be selected, else, a frequency having a lowest activity count (506) can be selected for transmitting a communication in response to the PTT.
Claims12
A method for receive frequency hopping on a mobile device, comprising:
- combining a receive scanning over a set of frequency channels with a scanning for a transmit frequency on the set of frequency channels for providing automated channel selection, wherein:
- on the receive scanning,
- scanning the set of frequency channels;
- determining whether a frequency is an active frequency;
- and
- and wherein:
- if a push-to-talk (PTT) is not initiated within a predetermined amount of time,
- determining whether the active frequency remains active during the predetermined amount of time, and
- if so,
- determining whether the active frequency corresponds to a private line of the mobile device;
- else,
- repeating the scanning of the set of frequency channels.
A method for transmit frequency hopping, comprising:
- determining whether a push to talk (PTT) is pressed;
- and
- selecting a transmit frequency from a set of frequencies based on a measured activity on the set of frequencies;
- determining whether the PTT is Dressed within a hang-time, and
- if the PTT is within the hang-time,
- selecting the frequency that is currently active during the hangtime,
- else
- selecting the frequency having a lowest activity count, for transmitting a communication in response to the PTT;
- determining whether the transmit frequency is an active frequency, and
- if so,
- repeating the scanning of the set of frequency channels;
- selecting the transmit frequency that has a next highest activity count,
- else,
- transmitting the communication on the transmit frequency until the PTT is released;
- upon a completion of the transmitting,
- repeating the scanning of the set of frequency channels;
- and
- updating activity levels for active frequencies.
A mobile device for transmit frequency hopping, comprising:
- a receiver for performing a receive scanning on a set of frequency channels;
- a transmitter coupled to the receiver for transmitting a communication on a frequency identified by the receiver;
- a processor coupled to the transmitter and receiver for combining the receive scanning with the transmitting for providing automated channel selection,
- wherein on detecting a push-to-talk (PTT), the processor selects a transmit frequency from the set of frequency channels based on a measured activity on the set of channels,
- a counter for assigning an activity level to active frequencies;
- a timer for determining whether a push to talk (PTT) is initiated within a hang-time;
- a comparator for selecting a transmit frequency based on an activity level measured during the receive scanning;
- and
- wherein the mobile device utilizes the transmit frequency hopping amongst a plurality of mobile devices which are in direct radio frequency communication without infrastructure support.
Dependencies are inferred from the claim text.