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System and method for efficiently managing communication channel assignments within talkgroups having dual mode communication units capable of operating on a first communication channel type and on a second communication channel type, and single mode communication units capable of operating only on

System and method for efficiently managing communication channel assignments within talkgroups having dual mode communication units capable of operating on a first communication channel type and on a second communication channel type, and single mode communication units capable of operating only on the second communication channel type. If, at a base site, each of the communication units associated with a talkgroup is a dual mode communication unit, a call for that talkgroup is assigned to be broadcast using a channel of the first communication channel type. If, at least one of the communication units associated with the talkgroup at the base site is a single mode communication unit, the call for that talkgroup is assigned to a channel of the second communication channel type. As communication units roam between sites, channel assignments are continuously updated based on the types of communication units at each base site at any one time.

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1. A method for managing communication channel assignments at a base site configured to wirelessly communicate with a talkgroup having a plurality of talkgroup members, the plurality of talkgroup members including at least one of a single mode communication unit or a dual mode communication unit, th

1. A method for managing communication channel assignments at a base site configured to wirelessly communicate with a talkgroup having a plurality of talkgroup members, the plurality of talkgroup members including at least one of a single mode communication unit or a dual mode communication unit, the dual mode communication unit being capable of operating on a first communication channel type and a second communication channel type and the single mode communication unit being capable of operating only on the second communication channel type, the method comprising: assigning a call to a first communication channel of the first communication channel type upon determining that each talkgroup member in wireless communication with the base site is a dual mode communication unit;broadcasting the call from the base site using the first communication channel;determining that a single mode communication unit associated with the talkgroup has roamed to the base site;determining whether a communication channel of the second communication channel type is available at the base site;assigning the call to a second communication channel of the second communication channel type if a communication channel of the second communication channel type is available at the base site;broadcasting the call from the base site using the second communication channel;broadcasting, from the base site, a channel grant signal for the second communication channel; anddeassigning the call from the first communication channel. 2. The method of claim 1 further comprising: if a communication channel of the second communication channel type is not available, determining if the call is a high priority call; andpreempting a lower priority call on a communication channel of the second communication channel type. 3. The method of claim 1 further comprising ceasing broadcast of a channel grant signal for the first communication channel upon broadcasting the channel grant signal for the second communication channel. 4. The method of claim 1 wherein deassigning the call from the first communication channel includes deassigning the call from the first communication channel upon the occurrence of a predetermined event. 5. The method of claim 4 wherein the predetermined event includes at least one of a dekey by a transmitting communication unit, a transition grant being received by the transmitting communication unit, end of the call, and a loss of audio from the transmitting communication unit for a predetermined amount of time. 6. The method of claim 1 wherein the first communication channel type is comprised of a communication channel at a first frequency and the second communication channel type is comprised of a communication channel at a second frequency. 7. A method for managing communication channel assignments at a base site configured to wirelessly communicate with a talkgroup having a plurality of talkgroup members, the plurality of talkgroup members including at least one of a single mode communication unit or a dual mode communication unit, the dual mode communication unit being capable of operating on a first communication channel type and a second communication channel type and the single mode communication unit being capable of operating only on the second communication channel type, the method comprising: assigning a call to a first communication channel of the second communication channel type upon determining that at least one talkgroup member in wireless communication with the base site is a single mode communication unit;broadcasting the call from the base site using the first communication channel;determining that each single mode communication unit in the talkgroup has roamed away from the base site;determining whether a communication channel of the first communication channel type is available at the base site;assigning the call to a second communication channel of the first communication channel type if a communication channel of the first communication channel type is available at the base site;broadcasting the call from the base site using the second communication channel;broadcasting, from the base site, a channel grant signal for the second communication channel; anddeassigning the call from the first communication channel. 8. The method of claim 7 further comprising ceasing broadcast of a channel grant signal for the first communication channel upon broadcasting the channel grant signal for the second communication channel. 9. The method of claim 7 wherein assigning the call to the second communication channel includes assigning the call to the second communication channel upon the occurrence of a predetermined event. 10. The method of claim 9 wherein the predetermined event includes at least one of a dekey by a transmitting communication unit, a transition grant being received by the transmitting communication unit, and a loss of audio from the transmitting communication unit for a predetermined amount of time. 11. A communication system comprising: a talkgroup having a plurality of talkgroup members, the plurality of talkgroup members including at least one of a single mode communication unit or a dual mode communication unit, the dual mode communication unit being capable of operating on a first communication channel type and a second communication channel type and the single mode communication unit being capable of operating only on the second communication channel type;a base site configured to communicate with the talk group members; anda controller configured to, upon initialization of a call, assign the call to a communication channel of the first communication channel type upon determining that each talkgroup member in wireless communication with the base site is a dual mode communication unit, and assign the call to a communication channel of a second communication channel type upon determining that at least one talkgroup member in wireless communication with the base site is a single mode communication unitwherein the controller is further configured to, at a base site having the call assigned to a communication channel of the first communication channel type, determine whether a single mode communication unit in the talkgroup has roamed to the base site, assign the call to a communication channel of the second communication channel type upon determining that a single mode communication unit in the talkgroup has roamed to the base site and determining that the communication channel of the second communication channel type is available, and deassign the call from the communication channel of the first communication channel type after assigning the call to the communication channel of the second communication channel type. 12. The communication system of claim 11 wherein the controller is configured to deassign the call from the communication channel of the first communication channel type upon the occurrence of a predetermined event. 13. The communication system of claim 12 wherein the predetermined event is at least one of a dekey by a transmitting communication unit, a transition grant being received by the transmitting communication unit, end of the call, and a loss of audio from the transmitting communication unit for a predetermined amount of time. 14. The communication system of claim 11 wherein the controllers is further configured to determine, if the communication channel of the second communication channel type is not available, whether the call is a high priority call, and preempt a lower priority call on a communication channel of the second communication channel type if the call is a high priority call. 15. The communication system of claim 11 wherein the controller is further configured to, at a base site having the call assigned to a communication channel of the second type, determine whether each single mode communication unit in the talkgroup has roamed away from the base site, assign the call to a communication channel of the first communication channel type if each single mode communication unit in the talkgroup has roamed away from the base site, and deassign the call from the communication channel of the second communication channel type after assigning the call to the communication channel of the first communication channel type. 16. The communication system of claim 11 wherein the system includes a plurality of base sites, and wherein the call is assigned to a communication channel of the first communication channel type at one of the plurality of base sites and the call is assigned to a communication channel of the second communication channel type at another one of the plurality of base sites.