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AssigneeM/A-COM Private Radio Systems, Inc.
InventorsWilliam Oscar Janky, Eugene H. Peterson III
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An extended addressing protocol for use with digital trunked radio systems that allows the maximum number of radios on a digital trunked radio system to be increased, and also allows the maximum number of groups within the system to be increased, while at the same time remaining consistent with the timing structure currently used by existing radios. The preferred embodiment of the present invention increases the logical identifier from 14 bits to 20 bits (corresponding to an increase in the number of individual radios on a system from 16,384 available in the prior art to 1,048,574 available on a system operating in accordance with the present invention), and increases the group identifier from 11 bits to 16 bits (corresponding to an increase in the number of groups available on a system from 2,048 available in the prior art to 65,534 available on a system operating in accordance with the present invention), while remaining within the standard protocol timing structure currently used by existing EDACS systems.
A method for reliable communication within a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use by a subset of radio units by digital control signals transmitted over said control channel, said control channel carrying outbound digital control signals from a base site to said radio units, said outbound digital control signals having a fixed transmission time slot, said method comprising the steps of:
A method for reliable communication within a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use by a subset of radio units by digital control signals transmitted over said control channel, said control channel carrying inbound digital control signals from said radios to a base site, said inbound digital control signals having a fixed transmission time slot, said method comprising the steps of:
Dependencies are inferred from the claim text.
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Large scale networks; Deep hierarchical networks: trunked mobile radio systems
Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective…:…
Network data management: network addressing or numbering for mobility support
Wireless communication networks
Term end not estimated
The present invention relates, in general, to digital trunked radio systems, and more specifically to a system for extended addressing for a digital trunked radio system.
Digital trunked radio communication systems are commonly used by public service organizations, such as police, fire, and ambulance squads, and by many private organizations to communicate with each other. Digital trunked radio systems provide an efficient means to communicate between single users and/or groups of users. They allow for one call to be made to many users simultaneously, such as a police dispatcher sending out a call to a group of officers at once. Any officer receiving the call has the ability to respond to the dispatcher, as well as to all other officers in the group. This makes this type of communication system well suited for public safety and municipal applications.
Digital trunked radio systems operate by allowing a user to transfer a voice call (or data call) to another user or group of users on the system. The information is transferred on one of a plurality of channels, referred to as working channels. A control channel assigns a working channel to every transmission, and notifies both the transmitting radio and all receiving radios of the working channel assignment. When the transmission is completed, the assigned working channel is released, and thus becomes available for a new transmission.
FIG. 1 is an illustration of a digital trunked radio system, such as EDACS, in accordance with the prior art.
FIG. 2a is a bit diagram of an outbound control channel transmission.
FIG. 2b is a table of examples of items sent within an outbound control channel transmission.
The preferred embodiment of the present invention provides an extended addressing protocol for increasing the number of users and groups in a digital trunked radio communication system. For sake of example, the following description shall be set forth in connection with an EDACS radio system. However, it should be understood that the same technique can be applied to various other digital trunked radio communication systems.
The preferred embodiment increases the number of individual radio identifiers to 1,048,574 (from 16,384 currently available) and increases the number of group identifiers to 65,534 (from 2,048 currently available) on an EDACS digital trunked radio system. However, it should be understood that other embodiments of the present invention would provide for various levels of increased LIDs and GIDs, and such increased levels are not limited to the numbers used in the preferred embodiment.
The EDACS system, like all digital trunked radio communication systems, uses a plurality of working channels for voice and data communication, and a control channel for system management purposes (e.g., working channel assignment, radio identifier information, group identifier information). The EDACS system in accordance with the present invention uses the working channels in the same manner as the prior art systems; thus, no discussion of these channels is contained herein. The following description is limited to a detailed discussion of the techniques used to transmit information on the control channel.