Radio frequency multicasting
First Claim
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1. A multicast site architecture for communicating land mobile radio (LMR) content, said multicast site architecture comprising:
- a plurality of communication sites; and
an LMR over Internet Protocol (IP) interface associated with at least one communication site of said plurality of communication sites, said LMR over IP interface configured to;
transmit call control and signaling information to a plurality of LMR units using at least one control multicast IP address,assign a different traffic multicast IP address to each of a plurality of talkgroups for communicating LMR content between LMR units of said plurality of LMR units which subscribe to at least one of said plurality of talkgroups,identify at least one talkgroup of said plurality of talkgroups having an active communication within said at least one communication site,determine if an LMR unit, which is not currently participating in said active communication, is a subscriber to said at least one talkgroup,identify a traffic multicast IP address that is assigned to said at least one talkgroup, andcommunicate said traffic multicast IP address to said LMR unit only if it is determined that said LMR unit is a subscriber to said talkgroup.
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Abstract
A method for radio frequency multicasting and a multicast site architecture are provided. The method includes assigning a different traffic multicast Internet Protocol (IP) address to each of a plurality of groups of LMR users and encapsulating the LMR content within IP packets. The method further includes transmitting the IP packets to one of the plurality of groups of LMR users using at least one of the assigned traffic multicast IP addresses.
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Citations
13 Claims
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1. A multicast site architecture for communicating land mobile radio (LMR) content, said multicast site architecture comprising:
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a plurality of communication sites; and an LMR over Internet Protocol (IP) interface associated with at least one communication site of said plurality of communication sites, said LMR over IP interface configured to; transmit call control and signaling information to a plurality of LMR units using at least one control multicast IP address, assign a different traffic multicast IP address to each of a plurality of talkgroups for communicating LMR content between LMR units of said plurality of LMR units which subscribe to at least one of said plurality of talkgroups, identify at least one talkgroup of said plurality of talkgroups having an active communication within said at least one communication site, determine if an LMR unit, which is not currently participating in said active communication, is a subscriber to said at least one talkgroup, identify a traffic multicast IP address that is assigned to said at least one talkgroup, and communicate said traffic multicast IP address to said LMR unit only if it is determined that said LMR unit is a subscriber to said talkgroup. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification