Abstract: A network management systems (NMS) and methods for automating aircraft wideband streaming L band providing dedicated high data rate communication links from an aircraft fitted with an approved L-band terminal and antenna over a satellite communication network, such as the Inmarsat Swift Broadband network. The systems and methods allow for modifying the L-band terminal wiring to inject a dedicated single channel per carrier (SCPC) signal from an external modem to achieve return data rates in the range of several Mbps over a dedicated leased satellite bandwidth.

Abstract: A method for prediction of UT handovers in a satellite communications network is provided. Optimal characteristics regarding the beams of satellites and regarding a one UT are determined. For each of a plurality of the satellite beams, for each of a plurality of instants of time tn, an estimated signal strength as seen at the UT is determined, wherein each estimated signal strength is determined based on the optimal at the respective time tn. A next instant of time tm is determined at which the estimated signal strength for a candidate beam that is within the view of the UT is greater than or equal to the estimated signal strength for the satellite beam that is currently servicing the UT. A handover of the UT, at the time tm, from the satellite beam that is currently servicing the one UT to the candidate beam is determined.

Abstract: A method (20) of determining sign of a calibration compensation for use in an antenna system (10) is provided, the antenna system (10) comprising individually calibrated subarrays (2a, 2b).

Abstract: A method for transmitting a data packet from a sensor to a controller via a peripheral sensor interface includes transmitting the data packet from the sensor via the sensor interface in a time window of a transmission period of a sensor interface operating mode which is synchronized by the controller. The data packet is re-transmitted by the sensor within the transmission period in at least one additional time window of the transmission period.

Abstract: A method for orienting reflectors of a communications system in a zone, wherein the communications system includes an antenna and the reflectors. The antenna is operable in one or more frequencies in a frequency range from 0.1 THz to 10.0 THz, with each of the reflectors being spaced apart from each other and the antenna. The method includes the steps of digitally predicting a future motor vehicle density distribution in the zone based on obtained past motor vehicle density distributions in the zone; digitally computing an orientation of each reflector such that the estimated power reception of electromagnetic waves radiated by the antenna is globally maximized for each motor vehicle of the future motor vehicle density distribution; and orienting each reflector according to the digitally computed orientation.

Abstract: A terrestrial terminal enables communications, over a network connection through a satellite, between a local host of one or more connected local hosts and a remote host. The terrestrial terminal is configured to perform operations comprising: receiving, from the remote host, a network packet for the local host; obtaining, from the network packet, an included TCP segment; determining, from the TCP segment, a receive window size advertised by the remote host; computing, using one or more characteristics of the network connection, a target receive window size; comparing the target receive window size with the advertised receive window size; and in response to determining that the target receive window size is different from the advertised receive window size: modifying the TCP segment by replacing the advertised receive window size with the target receive window size, and forwarding the network packet with the modified TCP segment to the local host.

Abstract: An illustrated embodiment disclosed herein is a method including determining, by an endpoint, a Doppler frequency offset and a first derivative of the Doppler frequency offset, calculating, by the endpoint, a second derivative of the Doppler frequency offset based on an orbital model, and calculating, by the endpoint, a first delta to the Doppler frequency offset and a second delta to the first derivative of the Doppler frequency offset.

Abstract: A high throughput fractionated satellite (HTFS) system and method where the functional capabilities of a conventional monolithic spacecraft are distributed across many small or very small satellites and a central command and relay satellite, the satellites are separated and flight in carefully design formations that allows the creation of very large aperture or apertures in space drastically reducing cost and weight and enabling high throughput capabilities by spatially reuse spectrum.

Abstract: Adaptive scheduling of compute functions in a fog network is described herein. An example method includes synchronizing kernel and hypervisor scheduling of applications used to control one or more edge devices using a global schedule, wherein the global schedule comprises timeslots for applications, and adapting the timeslots in real-time or near real-time based on application-based time related feedback that is indicative of time delays.

Abstract: This disclosure relates to a method in a satellite telecommunications system, and a device for performing the method, the satellite telecommunications system including one or more satellites, wherein the one or more satellites are configured to transmit data via a first plurality of spotbeams, the method including analyzing data relating to the first plurality of spotbeams; identifying a set of spotbeams of the first plurality of spotbeams based on the analysis; assigning a group identifier to each spotbeam of the set of spotbeams; and sending an update message to the one or more satellites associated with each spotbeam of the set of spotbeams, the update message including the group identifier.

Abstract: Methods and systems are provided that support the transmission of transport blocks over carrier bundles and bandwidth part (BWP) bundles. These carrier bundles and BWP bundles include physical resources from multiple carriers, the multiple carriers being a proper subset of the carriers configured for a user equipment (UE). A base station transmits an indication to the UE identifying one or more carrier bundles and/or BWP bundles. Each carrier bundle and BWP bundle supports the transmission of a respective transport block over a given duration, and is associated with a respective hybrid automatic repeat request (HARQ) entity.

Abstract: An interleaved encoder includes a number of encoders consisting of L parallel encoders, and a first switch circuit to sequentially couple an input node to an input port of one of the encoders. The input node receives a group of K*L symbols. Each symbol of the group of K*L symbols is received in synch with a respective clock pulse of a group of K*L clock pulses. The first switch circuit is synched with clock pulses of the group of K*L clock pulses, and sequentially couples the input node to an input port of a subsequent one of the encoders in response to each clock pulse of the group of K*L clock pulses.

Abstract: Techniques, systems, devices, and methods for utilizing a mobile communicator for communicating with multiple satellites, e.g., simultaneously over an interval of time, are disclosed. The mobile communicator is disposed on a vehicle, and the multiple satellites may be disposed in different satellite constellations operating in different orbits. The mobile communicator establishes multiple communication links to the multiple satellites by utilizing only the set of antenna resources provided by a single antenna platform or array. Subsets of the antenna resources are dynamically apportioned and adapted, e.g., while the vehicle travels, to establish and maintain different communication links to different satellites via different spatial channels and their respective air interfaces to thereby maintain optimal satellite communicative connectivity. On-board connectivity services for personal electronic devices and/or other on-board applications may be supported by the disclosed techniques.

Abstract: A satellite system has satellites supporting inter-satellite communication to form a multihop communication network; computing servers distributed over the satellites and networked together to form a space-based Internet network; and Border Gateway Protocol (BGP) routers integrated to the space-based Internet network. Each satellite is installed with a BGP router to locally manage the servers installed in this satellite. Data packets generated by the servers are transmitted from the servers to the BGP router entirely over an in-satellite local area network for carrying out routing of the data packets, lessening a communication burden on inter-satellite communication. The BGP routers also assign autonomous system (AS) numbers to the servers so as to enable the space-based Internet network to function independently without a need for support from a terrestrial Internet network.

Abstract: A constellation of Earth-orbiting spacecraft includes a first spacecraft disposed in a first orbit and a second spacecraft disposed in a second orbit. Each of the first orbit and the second orbit is substantially circular with a radius of approximately 42,164 km. The first orbit and the second orbit have a respective inclination with respect to the equator within a range of 5° to 20°. The first orbit has a first right ascension of ascending node (RAAN1) and the second orbit has a second RAAN (RAAN2) of approximately RAAN1+90°.

Abstract: A telecommunications payload for multibeam satellite coverage, includes at least one antenna and a plurality of sources connected to the antenna in order to deliver a beam corresponding to a spot on the Earth's surface, the satellite comprising a plurality of high-power amplifiers configured so as to supply the sources, wherein the payload also comprises a plurality of ring-shaped routing devices, each ring-shaped routing device comprising Ne input ports, where Ne?2, each input port being connected to one of the high-power amplifiers, and also comprising Ns output ports, each output port being connected firstly to a source, and being able to be connected secondly to at most one input port, and change alternately from a connection state to a disconnection state, each ring-shaped routing device being configured such that, at a time t, Ne output ports out of the Ns output ports are able to be supplied depending on the desired coverage.

Abstract: This spectrum protection system enables spectrum sharing that protects Earth Exploration-Satellite Services (EESS) observations, which allows for uninterrupted weather forecasting, from terrestrial operations that operate near or within EESS frequency bands without cumbersome restrictions on telecommunications (telecom) providers. The system calculates the satellite observation times using a device's location recognizing that these satellites are only observing a particular location on Earth for a very small amount of time because of their orbital dynamics and scanning characteristics. Using this calculated list of observation times and comparing it to the current time input, the system then enacts a mechanism for action when EESS observations are occurring. Two simple embodiments for the mechanism for action include momentarily changing frequencies or reducing transmission power levels to prevent erroneous EESS measurements.

Abstract: A method and system for performing handover in a third generation (3G) long term evolution (LTE) system are disclosed. A source evolved Node-B (eNode-B) makes a handover decision based on measurements and sends a handover request to a target eNode-B. The target eNode-B sends a handover response to the source eNode-B indicating that a handover should commence. The source eNode-B then sends a handover command to a wireless transmit/receive unit (WTRU). The handover command includes at least one of reconfiguration information, information regarding timing adjustment, relative timing difference between the source eNode-B and the target eNode-B, information regarding an initial scheduling procedure at the target eNode-B, and measurement information for the target eNode-B. The WTRU then accesses the target eNode-B and exchanges layer 1/2 signaling to perform downlink synchronization, timing adjustment, and uplink and downlink resource assignment based on information included in the handover command.

Abstract: Systems are disclosed for a communication system optimized for low data volume communications. In embodiments of the invention, a terminal in the communication system is configured to communicate with a satellite and a terrestrial hub using the same communications architecture, such as an air interface. In embodiments of the invention, the terminal sends a burst comprising a message to network infrastructure at a pre-scheduled time such that the network infrastructure can derive a terminal identity for the terminal by the time of the burst without having to include terminal identity information in the message. The terminal can communicate with the network infrastructure either through the satellite or through the terrestrial hub.

Abstract: A method includes receiving an ingress Diameter message related to a mobile subscriber from a MME located in a non-home network, sending a RIR message containing a mobile subscriber identifier to a HSS in a home network of the mobile subscriber, receiving identification information identifying a MME in the home network that conducted a most recent attachment of the mobile subscriber, utilizing the identification information to send an IDR message containing the mobile subscriber identifier to the identified MME, receiving an IDA message containing attachment timestamp data corresponding to the most recent attachment of the mobile subscriber in the home network, determining a transit time using the UE attachment timestamp data and timestamp information corresponding to the ingress Diameter message, and analyzing the transit time to determine if the ingress Diameter message is to be designated as a suspicious ingress message.

Abstract: A system and method for estimating calibration parameters and locating a Calibration Earth Station (CES) is described. The method may be performed offline. The method includes: providing L×M pilot signal measurements in a matrix R from L CESs and the M feed elements, wherein the matrix R comprises a set of channel coefficients c={c1, c2, . . . , cM}, and k={k1, k2, . . . , kL} perturbations; linking a subset of channel coefficients {c1, c2, . . . , cM} using each of the L CESs; and estimating a relative estimate of the k={k1, k2, . . . , kL} pertubations across the L CESs by using each of the L CESs as a bridging element. In the method, the bridging element provides a strong pilot signal for at least two of the L CESs. A set of criteria for determining locations of CESs have been described. A set of desirable properties for the solution set of L CESs have been disclosed. A combination of inner loop and outer loop methods for determining the final set of optimal locations have been described.

Abstract: A base station computer that includes a processor and memory storing instructions executable by the processor is described. The processor may be programmed to: determine a geographic position of a user terminal (UT); store the position in the memory; determine to page the UT; correlate a satellite beam based on the position; and page the UT via the satellite beam.

Abstract: A spectrum management system includes circuitry that determines available spectrum for a secondary communication system. The available spectrum is determined based on a disturbance tolerance of a primary communication system that is managed by the spectrum management system and a disturbance tolerance of another primary communication system that is managed by another spectrum management system. The circuitry then causes the setting of a spectrum for the secondary communication system based on the available spectrum and whether or not a spectrum request is received from the secondary communication system.

Abstract: A wireless communication system may include an SGW operably coupled to a PGW to setup a session responsive to a request from a terminal to establish the session between the terminal and the PGW. The system further includes an MME configured to authenticate the terminal and provide bearer management in response to the request. The MME is configured to provide bearer information to the SGW. The system also includes base stations operably coupled to the SGW via a data plane connection and operably coupled to the MME via a control plane connection. The base stations are configured to handover connection to the terminal between the base stations in response to movement of the terminal between coverage areas of the base stations.

Abstract: In particular embodiments, a system may include a spacecraft and optical ground terminals. The spacecraft includes at least an optical space terminal and a space switch unit. The space switch unit is configured to receive physical layer data frames from one optical space terminal, regenerate data-link layer data packets based on the physical layer data frames and route the regenerated data-link layer data packets to another optical space terminal. The optical ground terminals are configured to receive data-link layer data packets by one of the optical ground terminals, encode the received data-link layer data packets into physical layer data frames, transmit encoded physical layer data frames from one of the optical ground terminals to a respective optical space terminal through multiple forward channels at a data rate of 1 Tbps or above, the encoded physical layer data frames are decoded by the respective optical space terminal.

Abstract: Embodiments herein relate to a communication terminal (10) for handling communication, which communication terminal (10) is being served by a radio access node (12, 13) in a first cell (11) on a carrier of a licensed frequency spectrum and cross-carrier scheduled in a second cell (14) on a carrier of an unlicensed frequency spectrum by the radio access node (12, 13) via the first cell (11). The communication terminal receives an indication that data may be scheduled for the communication terminal (10) on a data channel in the second cell (14). The communication terminal attempts to detect presence of the data channel intended for the communication terminal (10). Then, in case the communication terminal (10) detects presence of the data channel intended for the communication terminal (10), the communication terminal (10) decodes the data channel.

Abstract: The present application includes systems and methods for determining pointing error of a satellite antenna. In one aspect a method for determining pointing error of a satellite antenna includes receiving, at a receiving station, a pointing error signal formed by the antenna and transmitted from a satellite, wherein the pointing error signal includes a first beacon (reference) signal and a modulated second beacon (error) signal. The receiving station may demodulate the received pointing error signal to recover the second beacon signal with respect to the first beacon signal, and based at least in part on the demodulated beacon signal, the receiving station may determine the pointing error of the satellite antenna.

Abstract: A phased array antenna system configured for communication with a satellite that emits or receives radio frequency (RF) signals and has a repeating ground track in a first direction, the antenna system includes a phased array antenna including a plurality of antenna elements distributed in a plurality of M columns oriented in the first direction and a plurality of N rows extending in a second direction normal to the first direction, and a plurality of fixed phase shifters aligned for phase offsets between antenna elements in the first direction and a gain-enhancement system configured for gain enhancement in the second direction of radio frequency signals received by and emitted from the phased array antenna.

Abstract: A method of controlling transmission of signals in a group of beams emitted by a satellite, wherein each beam has an associated area of coverage, includes adjusting an allocation of a channel resource by re-distributing portions of the channel resource among the beams in the group of beams in accordance with respective capacity demands for the areas of coverage of the beams in the group. The method further includes obtaining, for each of the areas of coverage, an indication of a signal quality from a terminal in the respective area of coverage for the adjusted allocation of the channel resource, and applying a co-channel interference mitigating technique to the group of beams in accordance with the obtained indications of the signal quality. The application further relates to an apparatus for performing such method.

Abstract: Disclosed is a satellite communication system that allocates bandwidth to maximize the capacity of the communication system while providing service to geographical areas having different demands. A smaller portion of the frequency spectrum can be allocated for subscriber beams that supply service to low demand areas. A larger portion of the frequency spectrum can be provided to subscriber beams that provide access to high demand areas. Allocation of bandwidth can be determined by the amount of demand in low demand areas versus the amount of demand in high demand areas. High demand gateways are physically located in low demand subscriber beams, while low demand gateways are physically located in high demand subscriber beams, which prevents interference.

Abstract: The terrestrial-based satellite telephone monitoring system may be used for, among other things, intelligence gathering purposes that intercept communications to or from target satellite handsets or terminals. The exemplary signal processing units receive wireless signals and extend the line-of-sight range of a terrestrial-based satellite telephone monitoring system. The exemplary signal processing unit may be installed in or on an aerial vehicle, such as an unmanned aerial vehicle (UAV), or a satellite, such as a CubeSat, or other vehicle.

Abstract: Embodiments provide in-flight configuration of satellite pathways to flexibly service terra-link and cross-link traffic in a constellation of non-processed satellites, for example, to facilitate flexible forward-channel and return-channel capacity in a satellite communications system. For example, each satellite in the constellation can include one or more dynamically configurable pathway, and switching and/or beamforming can be used to configure each pathway to be a forward-channel pathway or a return-channel pathway in each of a number of timeslots according to a pathway configuration schedule. At least some of the pathways can be further selectively configured, in each timeslot, to carry “terra-link” traffic to and/or from terrestrial terminals and “cross-link” traffic to and/or from one or more other satellites of the constellation.

Abstract: The present disclosure describes methods and apparatuses for satellite-based narrow-band communication. In some aspects, the systems include a user device (102) that establishes a Narrow-Band Internet of Things (NB-IoT) wireless connection (106) with one or more orbital satellites (104) in order to transmit (108) and receive (110) data when other wireless connections are not available. The data may be relayed by the orbital satellite (104) to and from a base station (202) on Earth.

Abstract: A satellite system can include one or more satellites that orbit the Earth. The one or more satellites may have satellite buses that support antenna arrays. The antenna arrays may include space fed arrays. Each space fed array may have an antenna feed array and an inner array that is coupled to a direct radiating array. The direct radiating array may operate in the same satellite band as the space fed array, or upconversion and downconversion circuitry may be used to communicatively couple a direct radiating array that operates in a different satellite band to the space fed array. The satellites may have peripheral walls with corner fittings that can be selected to provide the satellite bus with particular leg strengths. This can reduce overall mass of the satellites in a payload fairing while accommodating different types of antenna arrays.

Abstract: A system and method for regional routing of internet protocol based real-time communication that includes registering a set of client application endpoint routes, comprising registering at least a first client gateway route of a first endpoint in a first region; receiving a communication invitation of the first endpoint; processing a set of communication instructions associated with the communication invitation and identifying a set of communication resources and at least a second endpoint; querying the client application endpoint routes and identifying a client gateway route of the second endpoint; and dynamically directing signaling path and media path of the communication according to the regional availability of the communication resources, the client gateway route of the first endpoint, and client gateway instance route of the second endpoint.

Abstract: A method and apparatus for operating a satellite system including different satellites that may belong to different types of satellite constellations. In some implementations, the satellite system may include a LEO satellite constellation and one or more non-LEO satellite constellations that can be used to increase the forward link capacity of the LEO satellite constellation, for example, by allowing an LEO satellite to offload at least some of its forward link traffic to one of the non-LEO satellites. The user terminals can dynamically switch forward link communications between a LEO satellite and a non-LEO satellite while maintaining a return link connection with the LEO satellite.

Abstract: A satellite communications system comprising satellites in low earth orbit (LEO) as well as one or more satellites in orbits other than LEO, such as satellites in medium earth orbit (MEO) and/or satellites in geostationary orbit (GEO). The system routes data packets, such as may be received from the Internet, to either the LEO satellites or non-LEO satellites in accordance with routing logic. In some embodiments, the routing logic is based on the latency of the communications.

Abstract: When a Real-Time Transport Protocol (RTP) packet receiving manner of a user equipment (UE) is switched between a unicast transmission manner and a multicast transmission manner, a group communication service application server (GCS AS) obtains a time difference between a time at which the UE receives a first RTP packet before the switching and a time at which the UE receives a second RTP packet after the switching. The GCS AS calculates a delay difference, according to the time difference, of RTP packet transmissions in different transmission manners, and adjusts, according to the delay difference, timing for RTP packet transmission in the unicast transmission manner.

Abstract: Systems, methods, and software described herein provide enhancements for deploying communication networks in clusters of satellite devices. In one example, satellite system may include a ground node including a geosynchronous communication interface configured to transmit data to a geosynchronous satellite device in a geosynchronous orbit, the geosynchronous satellite device including a ground communication interface configured to receive data from at least the ground node, and a low earth orbit communication interface configured to broadcast the data for receipt by a plurality of low-earth orbiting satellite devices. The plurality of low-earth orbiting satellite devices each may include a geosynchronous communication interface configured to receive the data broadcast by the geosynchronous satellite device.

Abstract: A method of wireless communication includes receiving a plurality of parameter values at a user equipment (UE) using a first local oscillator (LO) frequency value, where the plurality of parameter values includes indications of a downlink frequency channel and an uplink frequency channel. The method further includes determining a second LO frequency value at the UE, where the second LO frequency value is determined using the indications of downlink and uplink frequency channels. The method further includes receiving downlink signals from an associated base station using the second LO frequency value.

Abstract: Various enhanced operations and orbital techniques for satellite devices are discussed herein. In one example, a method of operating an orbital satellite platform is provided. The method includes establishing relative distances between a plurality of satellite devices, and performing temporary adjustments to the relative distances between the satellite devices. The method also includes directing at least communication processes among the satellite devices based at least in part on the temporary adjustments to the relative distances.

Abstract: A method of providing cellular coverage involving: using an antenna system including S 2-dimensional, downward tilting phased array panels arranged about a common vertical axis, wherein with the S panels are organized into a plurality of groups, each of which includes L adjacent panels; generating a first plurality of narrow beams covering a first plurality of cells forming an outer ring of cellular coverage; and generating a second plurality of narrow beams covering a second plurality of cells forming an inner ring of coverage, wherein generating the first plurality of narrow beams involves, with each panel, generating N narrow beams of the first plurality of narrow beams; and wherein generating the second plurality of narrow beams involves, with each group of panels, generating M narrow beams of the second plurality of narrow beams.

Abstract: Techniques to reduce scheduling grants to minimize or eliminate the use of control channels, at the expense of flexibility, allow protection of the system from unnecessary retransmissions in case of interference from the primary system. Use of a single grant to allocate a set of resources across all carriers, or communication channels simplifies the system at the cost of retransmission of a grant for all carriers in the case if interference corrupts the transmission of a subset of the carriers. Thus, complementing a single grant embodiment with detection of the affected frequency carriers or victim carriers and remove such carriers from the carrier aggregation configuration allows more efficient use of the allocated spectrum.

Abstract: A first set of signal data is received. Generative machine learning models are trained based on the first set of signal data. The generative machine learning models include at least a first model trained to identify a first signal component and a second model trained to identify a second signal component. An incoming mixed signal data stream is dynamically separated into a clean signal component and a noise signal component by running the generative machine learning models.

Abstract: The disclosure provides for the flexible assignment of user beams to gateway beams in digital payload satellite systems. A “virtual beam”—a set of data values associating a physical user satellite beam with a Gateway Earth Station (“GW”) and used by the GW to service the physical user satellite beam, may be created or defined each time a physical user satellite beam is assigned to a GW. For one physical user beam, a plurality of virtual beams may be created, where each virtual beam corresponds to a GW. The virtual beams may be used to provide for the flexible assignment of user beams to gateway beams in a variety of applications such as GW expansion, physical user beam reassignment from one GW to another GW, diversity operation of terminals, and GW redundancy.

Abstract: An electronic device for a communications satellite for beamforming, channelization, and/or routing is implemented using a digital folded architecture to reduce the number of serial communication paths and provide more flexible routing and network configurability and scalability. A method for configuring the switching network of a system comprising multiple electronic devices allows the system to be dynamically reconfigured to implement different types of networks.

Abstract: Described techniques and apparatuses relate to determining an attenuation environment surrounding a satellite terminal in a satellite communication system. The satellite terminal may receive signals from an auxiliary satellite system, and determine aspects of an attenuation environment that may affect communications with a communications satellite system. For example, transmissions from an auxiliary satellite system may be associated with a respective location of the transmitting satellite in order to define an attenuation profile for the satellite terminal antenna assembly. Subsequent signals from the auxiliary satellite system may be compared with the attenuation map, and the comparison may be used to identify a diagnostic condition for communications with a communications satellite system.

Abstract: Methods, systems, and computer readable mediums for command engine execution are disclosed. One method for command engine execution includes receiving free-form information for requesting or modifying information about a computing system. The method also includes identifying a portion in the free-form information that is unsupported by a command engine. The method further includes converting, using a grammar module that supports the portion, the free-form information into at least one compatible command for interacting with at least one data set. The method also includes requesting or modifying the information about the computing system by interacting with the at least one data set using the at least one compatible command.

Abstract: In one implementation, interference generated by a constellation of satellites is mitigated. Each satellite is configured to provide multiple beams that define a coverage footprint. Anticipated positions are determined for satellites. Based on the anticipated positions, a determination is made that, during a defined period of time, portions of a coverage footprint for a first satellite will be covered by coverage footprints for other satellites. Based on this, a beam assignment for the first satellite is defined in which a first subset of beams configured to provide coverage of a first portion of the first coverage footprint are inactive, and a beam assignment for a second satellite is defined in which a second subset of beams are active, where the second subset of beams provide coverage within the first portion of the first coverage footprint.

Abstract: An emergency response system includes remote computing devices programmed via executable code instructions to broadcast an emergency alert to recipients, responsive to instructions received from administrators or emergency responders, the emergency alert including a response request permitting recipients to provide a binary positive or negative user status response, receive the responses from the recipients along with location information, send a map showing known recipient locations coded by corresponding response status to the administrators/responders, provide chat functionality between users during an emergency alert, provide social media functions including message exchange between users, and override the social media functions during an emergency alert so that social media messages cannot be exchanged.