Distributed simulcast architecture
A system and method for providing communication in a distributed LMR system architecture is provided herein, wherein the system includes a plurality of LMR subsystems interconnected by a data network. In some embodiments, a subsystem may include a distributed simulcast architecture comprising a plurality of LMR sites, each site having a subsystem controller and a plurality of repeaters. In one embodiment, one subsystem controller operates in an active mode and the remaining subsystem controllers operate in standby to provide redundancy. The repeaters include integrated voter comparator and simulcast controller functionality and circuitry. In some embodiments, the repeaters are operable in an active or standby mode, wherein repeaters in the active mode perform voter comparator and simulcast controller functionality. The distributed simulcast architecture provides simulcast controller and voter comparator redundancy, network failure redundancy, and site redundancy.
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This application claims priority to, the benefit of, and incorporates the contents by reference herein in entirety for any purpose, U.S. patent application Ser. No. 14/217,150, entitled “Distributed Simulcast Architecture” and filed Mar. 17, 2014 and U.S. Provisional Pat. Appl, Ser. No. 61/790,588, entitled “Distributed Simulcast Architecture” and filed Mar. 15, 2013.
FIELDThe present disclosure relates generally to communication systems. More specifically, but not by way of limitation, the present disclosure relates to a system and method for providing communication in a distributed simulcast architecture in a Land Mobile Radio (LMR) communication system.
BACKGROUNDThe statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Land Mobile Radio (LMR) systems are deployed by organizations requiring instant communication between geographically dispersed and mobile personnel. Current LMR systems can be configured to provide for radio communications between one or more sites and subscriber radio units in the field. A subscriber radio unit (hereinafter “radio”) may be a mobile unit or a portable unit. LMR systems can be as simple as two radio units communicating between themselves over preset channels, or they can be complex systems that include hundreds of radio units and multiple sites. Typical users of LMR systems include police departments, fire departments, medical personnel, security personnel, EMS, and the military.
Conventional and trunking LMR system architecture may include multiple LMR sites, each utilizing various equipment including, for example, dedicated site controllers, repeaters, voter comparator and simulcast controllers. Specifically, in simulcast system architecture, a prime site is deployed that hosts the site controllers, simulcast controllers and voter comparators. As the LMR system expands, additional equipment is needed, which becomes increasingly expensive to provide and maintain. Furthermore, each site in the LMR system is often controlled by equipment located at one of the sites comprising the LMR system or by the equipment located at the prime site. Accordingly, when such equipment fails, corresponding portions of the LMR system also fail. As such, conventional and trunking LMR system architecture lacks redundancy and, therefore, is often subject to single points of failure, thereby compromising the integrity of the LMR system architecture.
SUMMARYIn one embodiment, the present disclosure provides a system for providing communication in a distributed LMR system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the system comprising: one or more LMR sites comprising at least one of the one or more subsystems; one or more subsystem controllers disposed at each of the one or more LMR sites comprising the at least one subsystem, each subsystem controller having at least an active mode and a standby mode, wherein at least one subsystem controller is operable in the active mode to control communication between the one or more LMR sites in the at least one subsystem; and one or more repeaters disposed at each of the plurality of sites in the at least one subsystem, each of the repeaters operable to provide a communication channel, wherein each repeater has at least an active mode and a standby mode, and wherein at least one repeater is operable in the active mode to perform at least one of a simulcast controller operation and a voter comparator operation.
In another embodiment, the present disclosure provides a method for providing communication in a distributed land mobile radio (LMR) system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the method comprising: providing a subsystem controller in each of a plurality of LMR sites comprising one of the subsystems, each subsystem controller having at least an active mode and a standby mode; operating one of the subsystem controllers in the active mode to control communication between the plurality of LMR sites; operating the remaining subsystem controllers in the standby mode; providing a plurality of repeaters at each of the plurality of LMR sites comprising the subsystem, each repeater having at least an active mode and a standby mode; operating at least one of the repeaters in the active mode to perform at least one of a simulcast controller operation and a voter comparator operation; and operating the remaining repeaters in the standby mode.
Further embodiments and apparatuses, including other areas of applicability, will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure in any manner
For a more complete understanding of various embodiments of the present invention and the advantages thereof, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts, and in which:
In the following detailed description and accompanying drawings, numerous specific details are set forth to provide a thorough understanding of the present disclosure. However, those skilled in the art will appreciate that the present disclosure may be practiced, in some instances, without such specific details. In other instances, well-known elements have been illustrated in schematic or block diagram form in order not to obscure the present disclosure in unnecessary detail. Additionally, for the most part, specific details, and the like, have been omitted inasmuch as such details are not considered necessary to obtain a complete understanding of the present disclosure, and are considered to be within the purview of persons of ordinary skill in the relevant art.
It is further noted that, unless indicated otherwise, all functions described herein may be performed in hardware or as software instructions for enabling a computer, radio, or other device to perform predetermined operations, where the software instructions are embodied on a computer readable storage medium, such as RAM, a hard drive, flash memory, or other type of computer readable storage medium known to a person of ordinary skill in the art. In certain embodiments, the predetermined operations of the computer, radio, or other device are performed by a processor such as a computer or an electronic data processor in accordance with code such as computer program code, software, firmware, and, in some embodiments, integrated circuitry that is coded to perform such functions. Furthermore, it should be understood that various operations described herein as being performed by a user may be operations manually performed by the user, or may be automated processes performed either with or without instruction provided by the user.
An LMR system may employ a centralized architecture whereby various LMR subsystems are connected by a central network controller and associated network equipment.
In a trunked radio system, system talkgroups are often organized based on responsibility, such as Fire, Police, EMS, Public Works, and Mutual Aid. The user selects the talkgroup with which he wishes to communicate, and the trunked system then allocates the radio channel used for the voice transmission. For LMR systems having multiple groups with access to multiple channels at each site, a trunked system may be implemented to increase the system's efficiency.
A hybrid system combines conventional and trunked repeater channels into a single system. In hybrid systems, users can be organized functionally for either the conventional or trunked part of the system, as needed.
In addition to the foregoing, LMR system types may include wide area systems, which, in some embodiments, are designed to enable radios to move throughout an area without their users needing to change channels while roaming. A simulcast system is an example of a wide area system. An example of a simulcast system 500 is illustrated in
Another example of a wide area LMR system is a multicast system. In multicast systems, different transmitters within adjacent geographic areas communicate on different radio channel frequencies. The multicast system switches the user to the proper channel automatically. The multicast system configuration offers similar coverage advantages of a simulcast system at a reduced cost. However, multicast systems require multiple frequencies, and their users need to change mobile channels as they move between sites.
Referring again to
The present disclosure provides a system and method for providing communication in a distributed LMR system architecture. The distributed architecture eliminates the need for a central network controller and associated network equipment. Instead, the functionality of the network controller is distributed among controllers at each of the subsystems comprising the LMR system, thereby providing peer-to-peer communication over an internet protocol (IP) network.
As mentioned above, the distributed LMR architecture 600 eliminates the central network controller and associated equipment that is typically provided with a centralized architecture, and instead distributes the functionality of the central network controller and associated equipment among subsystem controllers deployed at each of the subsystems 610-630 comprising the distributed LMR architecture 600. In some embodiments, the central network controller functionality and associated equipment may also be distributed among dispatch stations 650.
As discussed in greater detail below, the distributed LMR architecture disclosed herein incorporates repeaters, subsystem controllers, network management systems, and dispatch consoles. In some embodiments, these components are IP-based and may be managed remotely over the IP network.
Repeaters provide channels/frequencies for over-the-air communication and, in some embodiments, are equipped with circuitry to provide integrated voter comparator and simulcast controller functionality/operations.
Subsystem controllers provide interface and gateway functionality for interconnecting multiple types of LMR subsystems through a common IP network. The subsystem controllers enable dispatch console control of local repeaters, provide distributed call control and mobility management functions, and enable direct routing of calls between conventional and trunked systems and/or dispatch consoles without talkgroup patching. The distributed architecture of the disclosed system enables each subsystem controller to perform central network controller functionality for a call originating from its local subsystem, thereby eliminating the need for a dedicated central network controller. As discussed in greater detail below, providing a subsystem controller at each site in a subsystem provides multi-level redundancy of the controller functionality, and allows for communication in case of equipment or site failure.
Network management systems provide redundant, web-based, and centralized network management functionality for the infrastructure comprising the distributed architecture system, including the various LMR subsystems (e.g., conventional, trunked, etc.), subsystem controllers, and dispatch consoles. The network management systems provide management and deployment of subscriber and talkgroup records; radio administration including radio inhibit, dynamic regrouping, and radio check; agency specific management of subscriber records, talkgroup records, and reporting; and pre-defined and custom roles that restrict operator access and activity based on access credentials. The network management systems also provide real-time fault monitoring of system components, extensive reports covering system usage and user activities, real-time monitoring of user and channel activities, and full redundancy capability.
Dispatch consoles provide interoperability via direct IP connection to the LMR subsystems. In some embodiments, the dispatch consoles are IP-based and fully distributed with no requirement for central control equipment, thereby allowing extensive scalability and expansion with no single point of failure.
Reference is now made to
The trunked subsystem 610 provides redundancy by incorporating two subsystem controllers 720. One of the subsystem controllers 720 is active, and the other is on standby. If the active subsystem controller 720 fails, then the standby subsystem controller 720 becomes active to provide a fail-safe transition with no visible impact to the radio users 725 and 740. As discussed above, the local subsystem controller 720 performs call controls, thereby eliminating the need for a central controller.
In accordance with the embodiment illustrated in
Reference is now made to
The sites 800A-800C are connected via their respective subsystem controllers 820, thereby eliminating the need for a central controller. The subsystem controllers 820 communicate directly with each other to setup a wide area call between interested sites. For example, a call originating from a first site (e.g., site 800A) is transferred to other interested sites (e.g., sites 800B and 800C) using the local subsystem controllers 820.
In accordance with the embodiment illustrated in
Reference is now made to
To provide redundancy, a single subsystem controller 920 located at one of the sites 900 is active for the entire subsystem 630, and the remaining subsystem controllers 920 located at the remaining sites 900 serve as standby. Additionally, a single repeater 910 located at one of the sites 900 is active to provide control channel functionality, or operations, and a single repeater 910 located at each of the remaining sites 900 is provided as standby in the event of failure of the active control channel repeater 910. The remaining repeaters 910 located at each of the sites are generally designated as voice channels for each of the channels provided by the subsystem 630, however, each repeater is also capable of performing voting and simulcast operations as explained below.
The trunked simulcast subsystem 630 employs both voting and simulcast operations to provide communication across the subsystem 630. In a simulcast operation, a single channel is usually provided by a collection of repeaters 910 distributed across multiple geographic sites comprising the subsystem (e.g., sites 900A, 900B, and 900C), wherein the repeaters 910 operate on the same frequency pair (transmit and receive), under voted and simulcast configurations, to expand the coverage area of the subsystem 630 into the sites (e.g., sites 900A, 900B, and 900C). In other words, in some embodiments, a single channel may be provided by one repeater 910 at each of the sites 900A-900C in the subsystem 630.
In a traditional simulcast LMR system, the capability of a radio's communication to reach the prime site can be limited by the transmit power of the radio. One way to improve the talkback capability of the radios is to use receiver voting to determine the location (e.g., site) of the radio to determine the best means for communicating with the radio.
In traditional systems, such as that illustrated in
In accordance with an embodiment of the present disclosure, the single voter comparator is eliminated (as is the central network controller), and the voter comparator functionality is integrated into each repeater in the subsystem. For example,
The repeater 1110 with active voter comparator functionality may perform voter comparator operations, including voting of signals 1120 for all sites in the subsystem 1130 (for the particular channel assigned to the repeater 1110). The voter comparator functionality of the remaining repeaters 1110 for the channel are on standby in case of failure of the active repeater 1110. This redundancy reduces the potential of operational downtime because, if the voter comparator functionality of one repeater 1110 fails, the voter comparator functionality of another repeater 1110 will become active.
If an adequate number of frequencies are not available for communication in an LMR system, a simulcast operation may be performed to reuse frequencies and cover a large geographic area. Referring again to
In a traditional simulcast LMR system, such as that illustrated in
In traditional simulcast LMR systems, such as that illustrated in
In accordance with an embodiment of the present disclosure, the single simulcast controller is eliminated (as is the central network controller), and the simulcast controller functionality is integrated into each repeater in the subsystem. For example,
Referring again to
For example, in one embodiment, repeaters 910A, 910B, and 910C are allocated to a particular channel. Repeater 910A may be active to provide simulcast controller operations for the channel allocated to repeaters 910A, 910B, and 910C, and repeaters 910B and 910C are on standby. If repeater 910A fails, repeater 910B or repeater 910C may become active to provide simulcast controller functionality for the channel allocated to repeaters 910A, 910B, and 910C.
It should be appreciated that other variations and embodiments may be considered within the scope of the present disclosure. For example, in some embodiments, one repeater 910 may provide active simulcast controller functionality for more than one channel in the subsystem 630. In this embodiment, the active simulcast repeater 910 may provide simulcast controller functionality for some, or all, of the channels in the subsystem 630. For example, repeater 910A may be allocated to a first channel, repeater 910B allocated to a second channel, and repeater 910C allocated to a third channel. Repeater 910A may provide active simulcast controller functionality for the first channel, second channel, third channel, or any combination thereof, and the remaining repeaters 910B and 910C may operate in standby mode.
In accordance with an embodiment of the present disclosure, the trunked simulcast subsystem 630 may operate in accordance with the following example call sequence discussed with reference to
As discussed above and illustrated in
Referring now to
As illustrated in
Referring briefly to
Reference is now made to
One of the subsystem controllers in each of the smaller subsystems 1710 and 1720 becomes active and continues to provide user communication on a reduced number of channels. For example, in the first reduced subsystem 1710, the subsystem controller at site 1715A becomes active and provides call control functionality for sites 1715A and 1715C. In the second reduced subsystem 1720, the subsystem controller at site 1715D remains active and provides call control functionality for sites 1715B and 1715D. This built-in redundancy ensures that users in each half 1710 and 1720 can still communicate with each other without interfering with RF signals in the overlapping area.
When compared to centralized LMR system architecture and traditional simulcast LMR systems, the foregoing disclosure of the distributed simulcast architecture provides various advantages and benefits. For example, the disclosed system provides increased reliability because the removal of a prime site eliminates the single-point-of-failure structure provided in a traditional simulcast system. Furthermore, distributing the functionality of the prime site to the various sites and equipment comprising the distributed simulcast subsystem reduces costs and maintenance required to maintain the system. Additionally, providing a subsystem controller at each site in the subsystem offers multiple levels of redundancy of the controller, and affords communication throughout the subsystem even in the event of various failures. Finally, providing voter comparator and simulcast controller functionality in each repeater provides N times the voter/simulcast controller availability in a traditional simulcast system, where N represents the number of sites in the subsystem. This also allows redundancy of voter comparator functionality and simulcast controller functionality within a site or across multiple sites (to survive network failure, site failure, or equipment failure), thereby providing communication in the event of multiple failures, and providing automatic and dynamic tuning of transmission launch time.
A number of additional and alternative embodiments of the disclosed system and method may be provided without departing from the spirit or scope of the present disclosure as set forth in the claims provided herein. These various embodiments are believed to be understood by one of ordinary skill in the art in view of the present disclosure.
Claims
1. A system for providing communication in a distributed land mobile radio (LMR) system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the system comprising:
- a plurality of LMR sites for providing radio communication between land mobile radios associated with the system, the plurality of LMR sites comprising at least one of the one or more subsystems;
- one or more subsystem controllers disposed at one or more of the plurality of LMR sites, the one or more of the plurality of LMR sites comprising one or more of the at least one or more subsystems, and one or more of the subsystem controllers having at least an active mode and a standby mode, wherein at least one subsystem controller is configured in the active mode to control communication between one or more of the land mobile radios and to control communication between LMR sites; and
- one or more repeaters disposed at one or more of the plurality of LMR sites in the at least one or more subsystems, one or more of the repeaters configured to provide a communication channel for at least one of the land mobile radios to communicate with one or more of the plurality of LMR sites,
- wherein one or more repeater has at least an active mode and a standby mode, and wherein at least one repeater is configured in the active mode to initiate at least one of a voter comparator operation and a simulcast controller operation,
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by repeaters on the communication channel, and
- wherein subsystem controllers in a standby mode are configurable to switch to the active mode upon failure of at least a portion of the one or more sites comprising a subsystem controller operating in the active mode.
2. The system as set forth in claim 1, wherein the simulcast controller operation includes synchronizing a transmit time of calls transmitted by one or more of the repeaters.
3. The system as set forth in claim 1, wherein a first repeater in the active mode is configurable to perform the simulcast controller operation for the communication channel that is provided by the first repeater.
4. The system as set forth in claim 1, wherein a first repeater in the active mode is configurable to perform the simulcast controller operation for a communication channel that is provided by a different repeater than the first repeater.
5. The system as set forth in claim 4, wherein the communication channel provided by the first repeater in the active mode is a first frequency, and the communication channel provided by the different repeater is a second frequency different than the first frequency.
6. The system as set forth in claim 1, wherein the subsystem controller is further configurable to provide communication between two or more subsystems comprising the distributed LMR system architecture.
7. The system as set forth in claim 1, wherein the data network is an Internet Protocol network.
8. The system as set forth in claim 1, wherein the at least one subsystem is a simulcast subsystem.
9. A system for providing communication in a distributed land mobile radio (LMR) system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the system comprising:
- a plurality of LMR sites for providing radio communication between land mobile radios associated with the system, the plurality of LMR sites comprising at least one of the one or more subsystems;
- one or more subsystem controllers disposed at one or more of the plurality of LMR sites, the one or more of the plurality of LMR sites comprising one or more of the at least one or more subsystems, and one or more of the subsystem controllers having at least an active mode and a standby mode, wherein at least one subsystem controller is configured in the active mode to control communication between one or more of the land mobile radios and to control communication between LMR sites; and
- one or more repeaters disposed at one or more of the plurality of LMR sites in the at least one or more subsystems, one or more of the repeaters configured to provide a communication channel for at least one of the land mobile radios to communicate with one or more of the plurality of LMR sites,
- wherein one or more repeater has at least an active mode and a standby mode, and wherein at least one repeater is configured in the active mode to initiate at least one of a voter comparator operation and a simulcast controller operation,
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by repeaters on the communication channel, and
- wherein the voter comparator operation includes comparing a strength of one or more received signals to determine a strongest signal to use for communication between two or more land mobile radios associated with the system.
10. A system for providing communication in a distributed land mobile radio (LMR) system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the system comprising:
- a plurality of LMR sites for providing radio communication between land mobile radios associated with the system, the plurality of LMR sites comprising at least one of the one or more subsystems;
- one or more subsystem controllers disposed at one or more of the plurality of LMR sites, the one or more of the plurality of LMR sites comprising one or more of the at least one or more subsystems, and one or more of the subsystem controllers having at least an active mode and a standby mode, wherein at least one subsystem controller is configured in the active mode to control communication between one or more of the land mobile radios and to control communication between LMR sites; and
- one or more repeaters disposed at one or more of the plurality of LMR sites in the at least one or more subsystems, one or more of the repeaters configured to provide a communication channel for at least one of the land mobile radios to communicate with one or more of the plurality of LMR sites,
- wherein one or more repeater has at least an active mode and a standby mode, and wherein at least one repeater is configured in the active mode to initiate at least one of a voter comparator operation and a simulcast controller operation
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by repeaters on the communication channel, and
- wherein repeaters in a standby mode are configurable to switch to the active mode upon failure of a repeater operating in the active mode.
11. A system for providing communication in a distributed land mobile radio (LMR) system architecture, the distributed LMR system architecture comprising one or more subsystems in communication with a data network, the system comprising:
- a plurality of LMR sites for providing radio communication between land mobile radios associated with the system, the plurality of LMR sites comprising at least one of the one or more subsystems;
- one or more subsystem controllers disposed at one or more of the plurality of LMR sites, the one or more of the plurality of LMR sites comprising one or more of the at least one or more subsystems, and one or more of the subsystem controllers having at least an active mode and a standby mode, wherein at least one subsystem controller is configured in the active mode to control communication between one or more of the land mobile radios and to control communication between LMR sites; and
- one or more repeaters disposed at one or more of the plurality of LMR sites in the at least one or more subsystems, one or more of the repeaters configured to provide a communication channel for at least one of the land mobile radios to communicate with one or more of the plurality of LMR sites,
- wherein one or more repeater has at least an active mode and a standby mode, and wherein at least one repeater is configured in the active mode to initiate at least one of a voter comparator operation and a simulcast controller operation
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by repeaters on the communication channel, and
- wherein subsystem controllers in a standby mode are configurable to switch to the active mode upon failure of a subsystem controller operating in the active mode.
12. An LMR site for providing radio communication between land mobile radios, the LMR site comprising:
- a subsystem controller having at least an active mode and a standby mode, wherein the subsystem controller is configured in the active mode to control communication between at least one of the land mobile radios and the LMR site; and
- a first repeater configured to provide a first communication channel for the at least one of the land mobile radios,
- wherein the first repeater has at least an active mode and a standby mode, and wherein the first repeater is configured in the active mode to initiate at least one of a voter comparator operation and a simulcast controller operation to transmit a radio call by the first repeater at least substantially simultaneously with a second repeater on the communication channel, and
- wherein the voter comparator operation includes comparing a strength of one or more received signals to determine a strongest signal to use for communication between two or more land mobile radios associated with the system.
13. The system as set forth in claim 12, wherein the simulcast controller operation includes synchronizing a transmit time of calls transmitted by the first repeater and the second repeater.
14. The system as set forth in claim 12, wherein the first repeater is in the active mode and is configurable to perform the simulcast controller operation for the first communication channel, wherein the first communication channel is provided by the second repeater.
15. The system as set forth in claim 12, in the first repeater is in the active mode and is configurable to perform the simulcast controller operation for the first communication channel, wherein the first communication channel provided by the first repeater, and wherein a second communication channel provided by the second repeater is a second frequency different than the first frequency.
16. A subsystem configured for providing communication in a distributed land mobile radio (LMR) system architecture, the subsystem comprising:
- a subsystem controller associated with at least one of a plurality of LMR sites, the subsystem controller configured to provide radio communication between land mobile radios,
- wherein the subsystem controller has at least an active mode and a standby mode, and the subsystem controller is configured in the active mode to control communication between a land mobile radio and the at least one of the plurality of LMR sites,
- wherein the subsystem controller is further configured to control a first repeater at a first LMR site and a second repeater at a second LMR site, the first repeater and the second repeater configured to initiate at least one of a voter comparator operation and a simulcast controller operation,
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by the first repeater and the second repeater on a same radio frequency,
- wherein the simulcast controller operation further comprises assigning a launch time, and sending a signal to a plurality of repeaters including the first repeater and the second repeater all on the same radio frequency whereby the radio call is transmitted at least substantially simultaneously at the assigned launch time by the repeaters on the same radio frequency.
17. A subsystem configured for providing communication in a distributed land mobile radio (LMR) system architecture, the subsystem comprising:
- a subsystem controller associated with at least one of a plurality of LMR sites, the subsystem controller configured to provide radio communication between land mobile radios,
- wherein the subsystem controller has at least an active mode and a standby mode, and the subsystem controller is configured in the active mode to control communication between a land mobile radio and the at least one of the plurality of LMR sites,
- wherein the subsystem controller is further configured to control a first repeater at a first LMR site and a second repeater at a second LMR site, the first repeater and the second repeater configured to initiate at least one of a voter comparator operation and a simulcast controller operation,
- wherein the simulcast controller operation comprises transmitting a radio call at least substantially simultaneously by the first repeater and the second repeater on a same radio frequency,
- wherein the voter comparator operation includes comparing a strength of one or more received signals to determine a strongest signal to use for communication between the land mobile radio and the at least one of the plurality of LMR sites.
4870408 | September 26, 1989 | Zdunek et al. |
5214789 | May 25, 1993 | George |
5293638 | March 8, 1994 | Sasuta et al. |
5420909 | May 30, 1995 | Ng et al. |
5594940 | January 14, 1997 | Peterson et al. |
5850444 | December 15, 1998 | Rune |
5901341 | May 4, 1999 | Moon et al. |
6028846 | February 22, 2000 | Cain |
6119010 | September 12, 2000 | Labedz |
6134514 | October 17, 2000 | Liu et al. |
6134515 | October 17, 2000 | Skogby |
6141347 | October 31, 2000 | Shaughnessy et al. |
6199032 | March 6, 2001 | Anderson |
6336035 | January 1, 2002 | Somoza et al. |
6374115 | April 16, 2002 | Barnes |
6545995 | April 8, 2003 | Kinnunen et al. |
6571082 | May 27, 2003 | Rahman et al. |
6618696 | September 9, 2003 | Dean et al. |
6744746 | June 1, 2004 | Bartelme |
6754224 | June 22, 2004 | Murphy |
6771703 | August 3, 2004 | Oguz |
6771966 | August 3, 2004 | Chow |
6813593 | November 2, 2004 | Berger |
6822947 | November 23, 2004 | Sawyer et al. |
6898188 | May 24, 2005 | Hamami |
6934555 | August 23, 2005 | Silva et al. |
6940838 | September 6, 2005 | Stead |
6941457 | September 6, 2005 | Gundavelli et al. |
6985735 | January 10, 2006 | Gustafsson |
6996510 | February 7, 2006 | Reilly et al. |
7006467 | February 28, 2006 | Anton, Jr. et al. |
7035643 | April 25, 2006 | Slawitschka et al. |
7056217 | June 6, 2006 | Pelkey et al. |
7075893 | July 11, 2006 | Mlinarsky et al. |
7080147 | July 18, 2006 | Wang et al. |
7113791 | September 26, 2006 | Lepschy et al. |
7120432 | October 10, 2006 | Voyer |
7133679 | November 7, 2006 | Zhu |
7184790 | February 27, 2007 | Dorenbosch et al. |
7218620 | May 15, 2007 | Lee |
7221660 | May 22, 2007 | Simonson et al. |
7231330 | June 12, 2007 | Hernandez-Mondragon et al. |
7236779 | June 26, 2007 | Lahav et al. |
7246055 | July 17, 2007 | Singh |
7251456 | July 31, 2007 | Chiu |
7263471 | August 28, 2007 | Barbaresi et al. |
7277395 | October 2, 2007 | Rosen et al. |
7308268 | December 11, 2007 | Barbosa da Torre et al. |
7324588 | January 29, 2008 | Green et al. |
7379740 | May 27, 2008 | Da Torre et al. |
7386435 | June 10, 2008 | Sutinen et al. |
7403779 | July 22, 2008 | De Cambray-Mathan |
7433692 | October 7, 2008 | De Santis et al. |
7486636 | February 3, 2009 | Francalanci et al. |
7564805 | July 21, 2009 | Cortez et al. |
7596377 | September 29, 2009 | Barberis et al. |
7636339 | December 22, 2009 | Shaffer et al. |
7639988 | December 29, 2009 | Abusch-Magder et al. |
7664846 | February 16, 2010 | Tiruthani |
7672669 | March 2, 2010 | Alexander et al. |
7698121 | April 13, 2010 | Steenkiste et al. |
7729287 | June 1, 2010 | Griffiths |
7738407 | June 15, 2010 | Chow et al. |
7747248 | June 29, 2010 | Escott |
7747249 | June 29, 2010 | Guo et al. |
7760660 | July 20, 2010 | Conway |
7764633 | July 27, 2010 | Marque-Pucheu |
7765093 | July 27, 2010 | Li et al. |
7770068 | August 3, 2010 | Drees |
7783463 | August 24, 2010 | Herro |
7796983 | September 14, 2010 | Pao et al. |
7809659 | October 5, 2010 | Paiz |
D636361 | April 19, 2011 | Frandsen et al. |
7929475 | April 19, 2011 | Simonson et al. |
7970425 | June 28, 2011 | Balachandran et al. |
8059574 | November 15, 2011 | Roy et al. |
8160076 | April 17, 2012 | Aggarwal et al. |
8255684 | August 28, 2012 | Benshetler et al. |
8300668 | October 30, 2012 | Kim et al. |
8352223 | January 8, 2013 | Anthony et al. |
8483114 | July 9, 2013 | Roy et al. |
8694037 | April 8, 2014 | Hartless |
8694774 | April 8, 2014 | Benshetler et al. |
9042813 | May 26, 2015 | Milhorn et al. |
9148421 | September 29, 2015 | Benshetler et al. |
9252982 | February 2, 2016 | Jobe et al. |
9407499 | August 2, 2016 | Brown et al. |
9516475 | December 6, 2016 | Roy et al. |
9763260 | September 12, 2017 | Bane et al. |
9774386 | September 26, 2017 | Roy et al. |
9800460 | October 24, 2017 | Roy et al. |
10004082 | June 19, 2018 | Bane et al. |
10117111 | October 30, 2018 | Jobe et al. |
10212026 | February 19, 2019 | Roy et al. |
20010010689 | August 2, 2001 | Awater |
20020114302 | August 22, 2002 | McDonald et al. |
20020155839 | October 24, 2002 | Nisbet |
20030016834 | January 23, 2003 | Blanco |
20030058858 | March 27, 2003 | Berlyoung et al. |
20030063569 | April 3, 2003 | Kalliokulju et al. |
20030086405 | May 8, 2003 | Silva et al. |
20030095510 | May 22, 2003 | Dorenbsoch |
20040070515 | April 15, 2004 | Burkley et al. |
20040132453 | July 8, 2004 | Gabriel et al. |
20040170149 | September 2, 2004 | Lee |
20040214577 | October 28, 2004 | Borst et al. |
20040214583 | October 28, 2004 | Graham et al. |
20050165919 | July 28, 2005 | Qian et al. |
20050174986 | August 11, 2005 | Emond et al. |
20050180448 | August 18, 2005 | Kobayashi |
20050198359 | September 8, 2005 | Basani et al. |
20050233751 | October 20, 2005 | Bardwell |
20050267928 | December 1, 2005 | Anderson et al. |
20050281208 | December 22, 2005 | Dorenbosch et al. |
20050282590 | December 22, 2005 | Haparnas |
20060140125 | June 29, 2006 | Ottinger et al. |
20060160562 | July 20, 2006 | Davis |
20060205398 | September 14, 2006 | Seckendorf et al. |
20060211443 | September 21, 2006 | Wegman |
20060217120 | September 28, 2006 | Annunziato et al. |
20060217122 | September 28, 2006 | Levit et al. |
20060240814 | October 26, 2006 | Cutler |
20060262800 | November 23, 2006 | Martinez et al. |
20060274659 | December 7, 2006 | Ouderkirk |
20060282247 | December 14, 2006 | Brennan et al. |
20070014263 | January 18, 2007 | Ferrato et al. |
20070019769 | January 25, 2007 | Green et al. |
20070061442 | March 15, 2007 | Kan et al. |
20070072619 | March 29, 2007 | Wei |
20070104121 | May 10, 2007 | Shaffer et al. |
20070147296 | June 28, 2007 | Barbaresi et al. |
20070147357 | June 28, 2007 | Pelletier et al. |
20070160181 | July 12, 2007 | Barbaresi et al. |
20070242670 | October 18, 2007 | Simonson et al. |
20070259692 | November 8, 2007 | Venkatachalam |
20070263597 | November 15, 2007 | Morinaga et al. |
20070263798 | November 15, 2007 | Dewing |
20070293159 | December 20, 2007 | Etelapera |
20080056466 | March 6, 2008 | Nishimura |
20080076425 | March 27, 2008 | Khetawat |
20080114239 | May 15, 2008 | Randall |
20080123650 | May 29, 2008 | Bhaskar |
20080144644 | June 19, 2008 | Allan et al. |
20080161006 | July 3, 2008 | Ferrato et al. |
20080270098 | October 30, 2008 | Sarkkinen |
20080293402 | November 27, 2008 | Rajan et al. |
20090024845 | January 22, 2009 | Benshetler et al. |
20090028059 | January 29, 2009 | Barbaresi et al. |
20090052339 | February 26, 2009 | Spring et al. |
20090112569 | April 30, 2009 | Angus et al. |
20090140949 | June 4, 2009 | Stratis et al. |
20090175209 | July 9, 2009 | Roy et al. |
20090185502 | July 23, 2009 | Sung et al. |
20090254330 | October 8, 2009 | Goria |
20090305709 | December 10, 2009 | Panico et al. |
20100020735 | January 28, 2010 | Roy et al. |
20100035619 | February 11, 2010 | Panico et al. |
20100105399 | April 29, 2010 | Akerlund |
20100141565 | June 10, 2010 | Frandsen et al. |
20100162036 | June 24, 2010 | Linden |
20100169446 | July 1, 2010 | Linden |
20100178925 | July 15, 2010 | Bernini et al. |
20100227583 | September 9, 2010 | Roy et al. |
20100232299 | September 16, 2010 | Conway |
20100303033 | December 2, 2010 | Shahar et al. |
20110034170 | February 10, 2011 | Zhong |
20120002588 | January 5, 2012 | Roy et al. |
20120035904 | February 9, 2012 | Seckendorf et al. |
20120039201 | February 16, 2012 | Roy et al. |
20120083307 | April 5, 2012 | Roy et al. |
20120102097 | April 26, 2012 | Jobe et al. |
20120331289 | December 27, 2012 | Benshetler et al. |
20130072165 | March 21, 2013 | Rondeau |
20130114493 | May 9, 2013 | Olivier et al. |
20130165134 | June 27, 2013 | Touag et al. |
20130215819 | August 22, 2013 | Ji et al. |
20130294323 | November 7, 2013 | Roy et al. |
20130337822 | December 19, 2013 | Rubin |
20140195801 | July 10, 2014 | Benshetler et al. |
20140273916 | September 18, 2014 | Roy |
20140357234 | December 4, 2014 | Sullivan |
20150057040 | February 26, 2015 | Kuehner |
20150326471 | November 12, 2015 | Anandan et al. |
20160014818 | January 14, 2016 | Reitsma et al. |
20160036624 | February 4, 2016 | Roy et al. |
20160100294 | April 7, 2016 | Ruelke et al. |
20160112882 | April 21, 2016 | Jobe et al. |
20160135207 | May 12, 2016 | Bane et al. |
20160249230 | August 25, 2016 | Akbar et al. |
20170311336 | October 26, 2017 | Bane et al. |
20180054350 | February 22, 2018 | Roy et al. |
20180295635 | October 11, 2018 | Bane et al. |
20190069186 | February 28, 2019 | Jobe et al. |
4434372 | March 1996 | DE |
10104926 | November 2001 | DE |
10061550 | June 2002 | DE |
102007008196 | August 2008 | DE |
1317158 | June 2003 | EP |
1335617 | August 2003 | EP |
1534032 | May 2005 | EP |
1534033 | May 2005 | EP |
2136582 | December 2009 | EP |
2427796 | January 2007 | GB |
WO-99/052314 | October 1999 | WO |
WO-2005/006798 | January 2005 | WO |
WO-2007/060808 | May 2007 | WO |
WO-2007/078467 | July 2007 | WO |
WO-2007/136270 | November 2007 | WO |
WO-2008/014818 | February 2008 | WO |
WO-2008/064706 | June 2008 | WO |
WO-2008/151464 | December 2008 | WO |
WO-2009/069507 | June 2009 | WO |
- Alcober, J. et al., “Multi-site Model and Simulation of Trunking Systems,” 5th IEEE International Conference on Universal Personal Communications, 1996, pp. 236-239, Universitat Politecnica de Catalunya, Barcelona.
- Baker, D. et al., “The Design and Simulation of a Mobile Radio Network with Distributed Control,” IEEE Journal on Selected Areas in Communications, Jan. 1984, pp. 226-237, vol. 2, Issue 1.
- Chiani, M. et al., “A Semi-Analytical Approach for Performance Evaluation of TCP-IP Based Mobile Radio Links,” Proceedings of Global Telecommunications Conference, 2000, pp. 937-942, vol. 2, IEEE, Piscataway, NJ.
- Chrapkowski, A. et al., “Mobile Trunked Radio System Design and Simulation,” 41st IEEE Vehicular Technology Conference, 1991, pp. 245-250, IEEE, New York, NY.
- D'Aria, G. et al., “Simulation and Performance of the Pan-European Land Mobile Radio System,” IEEE Transactions on Vehicular Technology, May 1992, pp. 177-189, vol. 41, Issue 2, IEEE.
- Farrell, T.C., et al., “A Computer Simulation Analysis of Conventional and Trunked Land Mobile Radio for a System with a Small Number of User Groups,” Military Communications Conference, Oct. 15-18, 1989, pp. 923-927, vol. 3.
- Gladstone, K.J. et al., “Computer Simulation of Multipath Fading in the Land Mobile Radio Environment,” Electronic Circuits and Systems, IEE Proceedings, Pt. G., Dec. 1980, pp. 323-330, vol. 127, Issue 6.
- Harada, H. et al., “Simulation and Software Radio for Mobile Communications,” book, 2002, pp. 335-364.
- Liebl, G. et al., “A Real-Time Simulation Environment for IP-Traffic Over Cellular Links,” 6th World Multiconference on Systemics, Cybernetics and Informatics Proceedings, 2002, pp. 1-6, vol. 4.
- Liu, W. et al., “Parallel Simulation Environment for Mobile Wireless Networks,” Proceedings of the 1996 Winter Simulation Conference, 1996, pp. 605-612, Coronado, CA.
- Loo, C., “A Statistical Model for a Land Mobile Satellite Link,” IEEE Transactions on Vehicular Technology, Aug. 1985, pp. 122-127, vol. 34, Issue 3, IEEE Vehicular Technology Society.
- Nehme, G. et al., “A Simulation Study of High-Capacity Cellular Land-Mobile Radio-Communication Systems,” Can. Elec. Eng. Journal, Jan. 1982, pp. 36-39, vol. 7, Issue 1, EIC, Canada.
- Onoe, Y. et al., “Cooperation of Multiple Simulators for Mobile IP Networks,” 17th International Conference on Advanced Information Networking and Applications, AINA 2003, pp. 367-372, IEEE, Piscataway, NJ.
- Patzold, M. et al., “A Deterministic Digital Simulation Model for Suzuki Processes with Application to a Shadowed Rayleigh Land Mobile Radio Channel,” IEEE Transactions on Vehicular Technology, May 1996, pp. 318-331, vol. 45, No. 2, IEEE.
- Perennou, T. et al., “Two-Stage Wireless Network Emulation,” Broadband Satellite Communication Systems and the Challenges of Mobility, 2005, pp. 181-190, vol. 169, IFIP International Federation for Information Processing.
- Prasad, M.V. et al., “A Comparison of Land Mobile Radio Prediction Methods in Indian Rural Zones,” IEEE International Conference on Personal Wireless Communications, 2005, pp. 217-219, IEEE.
- Short, J. et al., “Mobile Wireless Network System Simulation,” Wireless Networks, 1995, pp. 451-467, vol. 1, Issue 4, J.C. Baltzer AG, Science Publishers.
- Simon, G. et al., “Simulation-based Optimization of Communication Protocols for Large-Scale Wireless Sensor Networks,” 2003 IEEE Aerospace Conference Proceedings, 2003, pp. 1-8, IEEE.
- Smith, J. I., “A Computer Generated Multipath Fading Simulation for Mobile Radio,” IEEE Transactions on Vehicular Technology, Aug. 1975, pp. 39-40, vol. 24, Issue 3, IEEE.
- Song, James, WARNSimulator, WayBack Machine, dated Jul. 1, 2007, 1 pg.
- Zeng, X. et al., “GloMoSim: A Library for Parallel Simulation of Large-scale Wireless Networks,” Parallel and Distributed Simulation, 1998, pp. 154-161, Dept of Computer Science, Los Angeles, CA.
- Zhi-Yong, S. et al., “Design and Simulation of Trunking Communication System in TD-SCDMA Network Based on SIP Protocol,” 2009 International Symposium on Information Engineering and Electronic Commerce, May 2009, pp. 481-485, IEEE.
- Office Action, dated Apr. 22, 2014, in U.S. Appl. No. 13/278,641.
- Response to Office Action, dated Sep. 18, 2014, in U.S. Appl. No. 13/278,641.
- Final Office Action, dated Oct. 8, 2014, in U.S. Appl. No. 13/278,641.
- Response to Final Office Action, dated Jan. 5, 2015 in U.S. Appl. No. 13/278,641.
- Advisory Action and Applicant-Initiated Interview Summary, dated Jan. 29, 2015 in U.S. Appl. No. 13/278,641.
- Response to Advisory Action dated Feb. 9, 2015 in U.S. Appl. No. 13/278,641.
- Notice of Allowance dated Sep. 22, 2015 of U.S. Appl. No. 13/278,641.
- Office Action dated Feb. 21, 2017 in U.S. Appl. No. 14/815,095.
- Notice of Allowance dated Jun. 21, 2017 in U.S. Appl. No. 14/815,095.
- Copending U.S. Appl. No. 14/979,007, filed Dec. 22, 2015, first-named inventor: Marshall Jobe.
- Office Action dated Apr. 22, 2016 of U.S. Appl. No. 14/979,007.
- Response to Office Action dated Apr. 22, 2016 of U.S. Appl. No. 14/979,007, filed Sep. 22, 2016.
- Final Office Action dated Nov. 15, 2016 of U.S. Appl. No. 14/979,007.
- Response to Final Office Action dated Nov. 15, 2016 of U.S. Appl. No. 14/979,007, filed Jan. 17, 2017.
- Advisory Action and Interview Summary dated Feb. 7, 2017 of U.S. Appl. No. 14/979,007.
- Response to Final Office Action dated Nov. 15, 2016 of U.S. Appl. No. 14/979,007, filed Feb. 15, 2017.
- Office Action dated Jun. 28, 2017 of U.S. Appl. No. 14/979,007.
- Response to Office Action dated Jun. 28, 2017 of U.S. Appl. No. 14/979,007, filed Sep. 28, 2017.
- U.S. Appl. No. 15/641,747, Office Action dated Oct. 18, 2017.
- copending U.S. Appl. No. 15/786,476, filed Oct. 17, 2017, first-named inventor: Roy.
- U.S. Appl. No. 15/786,476, Office Action dated Feb. 26, 2018.
- U.S. Appl. No. 14/979,007, Office Action dated Jan. 5, 2018, 23 pgs.
- U.S. Appl. No. 14/979,007, Notice of Allowance, dated Jul. 3, 2018, 28 pgs.
- U.S. Appl. No. 14/979,007, Notice of Allowance, dated Jul. 25, 2018, 22 pgs.
- copending U.S. Appl. No. 16/171,177, filed Oct. 25, 2018, first-named inventor Marshall Jobe.
- Telecommunications Industry Association (TIA) with Electronic Industries Alliance (EIA), TIA/EIA Standard: Project 25—Trunking Control Channel Messages New Technology Standards Project Digital Radio Technical Standards (ANSI/TIA/EIA-102.AABC), May 2000, Telecommunications Industry Association (TIA), Arlington, VA (150 pages).
- Telecommunications Industry Association (TIA) with Electronic Industries Alliance (EIA), TIA/EIA Standard: Project 25—Trunking Control Channel Messages, Addendum 1, SNDCP Trunking Control Channel Messages (ANSI/TIA/EIA-102.AABC-1), Sep. 2001, Telecommunications Industry Association (TIA), Arlington, VA (11 pages).
- Telecommunications Industry Association (TIA) with Electronic Industries Alliance (EIA), TIA Standard: Project 25—Trunking Control Channel Messages, Addendum 2 Multiband Operations, New Technology Standards Project Digital Radio Technical Standards (ANSI/TIA-102.AABC-2), Dec. 2002, Telecommunications Industry Association (TIA), Arlington, VA (39 pages).
- Telecommunications Industry Association (TIA) with Electronic Industries Alliance (EIA), TIA/EIA Telecommunications Systems Bulletin, APCO Project 25—Trunking Overview (TSB102.AABA), Apr. 1995, Telecommunications Industry Association (TIA), Arlington, VA (12 pages).
- U.S. Appl. No. 60/950,868, filed Jul. 19, 2007; first-named inventor: Benshetler.
- U.S. Appl. No. 60/950,870, filed Jul. 19, 2007; first-named inventor: Benshetler.
- U.S. Appl. No. 60/963,131, filed Aug. 2, 2007; first-named inventor: Benshetler.
- U.S. Appl. No. 61/790,588, filed Mar. 15, 2013; first-named inventor: Arindam Roy.
- U.S. Appl. No. 62/076,473, filed Nov. 6, 2014; first-named inventor: Bane.
- Office Action dated Oct. 15, 2010 issued in U.S. Appl. No. 11/937,963 (15 pages).
- 1st Notice of Allowance dated Mar. 4, 2011 issued in U.S. Appl. No. 11/937,963 (5 pages).
- 2nd Notice of Allowance dated Jul. 1, 2011 issued in U.S. Appl. No. 11/937,963 (7 pages).
- Office Action dated Dec. 17, 2010 issued in U.S. Appl. No. 11/940,936 (12 pages).
- Final Office Action dated Jul. 1, 2011 issued in U.S. Appl. No. 11/940,936 (16 pages).
- Office Action dated Sep. 19, 2012 in U.S. Appl. No. 13/251,895.
- Response to Non-Final Office Action, dated Dec. 19, 2012, in U.S. Appl. No. 13/251,895.
- Notice of Allowance dated Mar. 12, 2013 in U.S. Appl. No. 13/251,895.
- Office Action dated May 20, 2013 in U.S. Appl. No. 13/595,981.
- Response to Office Action, dated Oct. 21, 2013, in U.S. Appl. No. 13/595,981.
- Terminal Disclaimer dated Oct. 21, 2013, in U.S. Appl. No. 13/595,981.
- Notice of Allowance dated Nov. 19, 2013 in U.S. Appl. No. 13/595,981.
- Office Action dated Mar. 27, 2015, in U.S. Appl. No. 13/937,005.
- Response to Office Action, dated Aug. 27, 2015, in U.S. Appl. No. 13/937,005.
- Final Office Action dated Sep. 16, 2015, in U.S. Appl. No. 13/937,005.
- Response to Final Office Action, dated Nov. 16, 2015, in U.S. Appl. No. 13/937,005.
- Terminal Disclaimer dated Dec. 2, 2015, in U.S. Appl. No. 13/937,005.
- Notice of Allowance dated Jan. 13, 2016 in U.S. Appl. No. 13/937,005.
- Notice of Allowance dated Apr. 19, 2016 in U.S. Appl. No. 13/937,005.
- Notice of Allowance dated Jul. 29, 2016 in U.S. Appl. No. 13/937,005.
- Office Action dated Dec. 10, 2014 in U.S. Appl. No. 14/200,812.
- Response to Office Action, dated Apr. 8, 2015, in U.S. Appl. No. 14/200,812.
- Terminal Disclaimer dated Apr. 8, 2015, in U.S. Appl. No. 14/200,812.
- Notice of Allowance dated May 26, 2015 in U.S. Appl. No. 14/200,812.
- copending U.S. Appl. No. 14/217,150, filed Mar. 17, 2014; first-named inventor: Arindam Roy.
- Office Action dated Oct. 2, 2015, in U.S. Appl. No. 14/217,150.
- Response to Office Action, dated Mar. 31, 2016, in U.S. Appl. No. 14/217,150.
- Office Action dated Jul. 11, 2016, in U.S. Appl. No. 14/217,150.
- Response to Office Action, dated Oct. 11, 2016, in U.S. Appl. No. 14/217,150.
- Response to Advisory Action, dated Oct. 31, 2016, in U.S. Appl. No. 14/217,150.
- Notice of Allowance dated Dec. 14, 2016, in U.S. Appl. No. 14/217,150.
- Notice of Allowance dated Jul. 11, 2017, in U.S. Appl. No. 14/217,150.
- Preliminary Amendment dated May 10, 2016, in U.S. Appl. No. 14/935,270.
- Notice of Allowance dated Apr. 4, 2017, in U.S. Appl. No. 14/935,270.
- copending U.S. Appl. No. 15/641,747, filed Jul. 5, 2017; first-named inventor: Bane.
- Copending U.S. Appl. No. 16/262,781, filed Jan. 30, 2019, entitled Interoperability Gateway for Land Mobile Radio System, first-named inventor Arindam Roy.
Type: Grant
Filed: Apr 21, 2017
Date of Patent: Aug 20, 2019
Patent Publication Number: 20170230107
Assignee: E.F. JOHNSON COMPANY (Irving, TX)
Inventors: Arindam Roy (Plano, TX), Larry Emmett (Dallas, TX)
Primary Examiner: Joseph Arevalo
Application Number: 15/494,391
International Classification: H04M 11/04 (20060101); H04B 7/26 (20060101); H04B 7/155 (20060101); H04B 7/14 (20060101);