Abstract:
Methods, systems, and apparatuses for providing layer-2 connectivity through a non-routed ground segment network, are described. A system includes a satellite configured to transmit data packets. The system further includes a non-autonomous gateway in communication with the satellite. The non-autonomous gateway is configured to receive the data packets from the satellite at layer-1 (Ll) of the OSI-model, generate a plurality of virtual tagging tuples within the layer-2 packet headers of the plurality of data packets. The non-autonomous gateway is further configured to transmit, at layer-2 (L2) of the OSI-model, the virtually tagged data packets. Each of the packets including a virtual tagging tuple and an entity destination. The system further includes a L2 switch in communication with the non-autonomous gateway. The L2 switch configured to receive the data packets and transmit the data packets to the entity based on the virtual tuples associated with each of the data packets. The virtual tagging tuple may be implemented as a VLAN tag according to the 802. IQ standard.
Abstract:
A radioterminal may include a transceiver, a hand-held interface coupled to the transceiver, and an interlock coupled to the transceiver. The transceiver may be configured to transmit and receive wireless communications, and the transceiver may be further configured to transmit high power communications at a high maximum power and/or EIRP and to transmit low power communications at a low maximum power and/or EIRP. The interlock may be configured to prevent the transceiver from transmitting high power communications at a power and/or EIRP that exceeds a threshold when the hand-held interface is activated. Related methods are also discussed.
Abstract:
A messaging system permitting the development and transmission of computer programming from a base station (102) to a mobile communications terminal (MCT) (104) for execution. The user creates programming including conditional logic for transmission to an MCT using a software development workstation (112) at a base station (100). The user programming is designed to extend the functionality of the built-in programming as supplied by the MCT manufacturer. The MCT receives the user programming, and stores it in a memory (204) for later execution, for example, when the manufacturer-supplied operating software initiates execution of the user programming. Messages transmitted from the MCT may be sent during periods of low network activity. The MCT schedules a reasonable number of messages for transmission at a randomly selected time within a certain scheduling window. The scheduling window takes into account network traffic concerns, future messages placed into the queue, and the number of messages present in the queue.
Abstract:
A wireless telephone having a wireless communication transceiver, a global positioning system (GPS) receiver, and a controller connected to both the wireless communication transceiver and the GPS receiver, wherein the controller intelligently adapts its GPS data maintenance schedule according to a unique set of indicators derived from the wireless telephone's operating conditions.
Abstract:
A small-sized planar antenna attached to a portable radio device is only for a narrow band. Therefore, the resonance frequency of the antenna is fluctuated by the interaction between the antenna and a peripheral dielectric, such as the enclosure, the body of the user, etc., and the transmission efficiency and reception sensitivity of the antenna are low. In order to solve such a problem, a communicating section (composed of a coaxial line or microstrip line) is provided in the portable radio device and a circularly polarized wave antenna for satellite communication is attached to the communication section so as to ensure the distances between the enclosure and antenna and between the body of the user and the antenna.
Abstract:
Information is retrieved from an information source (12) by wirelessly receiving, at a cellular telephone switch, a request by a subscriber unit for a predetermined selection of information. The request is communicated to the information source using at least one of a satellite communication system (16) and a wireless data network (22). The information source (12) retrieves the predetermined selection of information. A transmission of the predetermined selection to the cellular telephone switch (20) is inhibited if a utilization level of at least one of the satellite communication system and the wireless data network exceeds a threshold. When the utilization level is below the threshold, the predetermined selection is communicated to the cellular telephone switch. The predetermined selection is then forwarded to the subscriber unit when a utilization level of the cellular telephone switch is below a predetermined threshold.
Abstract:
Terrestrial antennas (10A, 10B and 10C) which are capable of transmitting and receiving radio signals directly to and from satellites in low Earth orbit are disclosed. The preferred embodiments of the invention employ printed circuit antenna elements (18) measuring only a fraction of an inch (less than 2 cm) in diameter. One embodiment (10A) includes an elevation array residing on a circular surface (14) and an azimuth array residing on a conical surface (12). This first embodiment (10A) resembles a flattened pyramid. Both the top and the curved exterior of the pyramid support circular, slotted, printed circuit patches (18). Other embodiment of the invention employ hemispherical (10B) or cylindrical (10C) configurations.
Abstract:
The invention concerns a terminal comprising: a) at least two adjustable antennae (1, 2) for transmitting/receiving radio signals carrying multimedia data; b) electronic means (41, 51, 61; 42, 52, 62) for processing received signals or signals to be transmitted by said antennae (1, 2); c) means (31, 32; 12) associated with each antenna for pointing the latter on a predetermined satellite of a constellation of such moving satellites forming part of a multimedia telecommunication system; and d) means (7) for selectively switching multimedia data transmission between the terminal and the satellites of said constellation, from the satellite whereon is pointed one of its antennae (1, 2) to the satellites whereon is pointed the other antenna, so as to ensure the continuity of data flow transmitted between the terminal and the constellation.
Abstract:
An approach for timing synchronization in a satellite system involving synchronizing a master clock onboard an orbiting satellite with a time standard; synchronizing a plurality of terrestrial gateways with the master clock; and synchronizing a plurality of wireless transceivers with the master clock; whereby each of the plurality of gateways and each of the plurality of wireless transceivers are synchronized with the master clock onboard the orbiting satellite.
Abstract:
An approach for error flow control in a communications system involves receiving a plurality of frames of data; determining in said plurality of frames of data, two or more contiguous defective frames of data, the two or more contiguous defective frames of data being followed by at least one frame of data in said plurality of frames that is not defective; forming a group reject message indicative of a range of the two or more contiguous defective frames; transmitting the group reject message; and receiving replacement frames, the replacement frames corresponding to the two or more contiguous defective frames, wherein said at least one frame that is not defective is not received again in response to the group reject message.