161 results about "Point-to-multipoint communication" patented technology

Point-to-point or point-to-multipoint communications are established based on a database query broadcast to all stations. Stations satisfying the query respond and communications are established with the station(s) responding. The database query is preferably directed to location, status or history of the station being queried. Responding stations may be displayed on a moving map and establishing communications with a responding station can be established by touching an icon of the station on a touch screen display.

A point-to-multipoint communications network includes an optical line terminal (OLT) and a number of optical network terminals (ONTS) which each detect and remove rogue ONTs from the network. The OLT monitors transmission errors to detect the presence of a rogue ONT, and can determine the identity of the rogue. Each ONT monitors its own upstream data packets to detect the presence of a rogue, and turns itself off when a rogue is detected.

Methods and systems for simultaneous transmission of simulcast and single cast information over a hybrid point to multipoint communication systems, including the steps of: selecting an area to be ubiquitously covered by a common channel; assigning a first wireless client to the common channel; assigning a second wireless client to a first private channel; setting a first hybrid converter and a second hybrid converter having an aggregated coverage area that comprises the selected area; connecting the first hybrid converter using an orthogonal multi-carrier transmission having a first frequency and the second hybrid converter using an orthogonal multi-carrier transmission having a second frequency to a centralized synchronizing communication controller via a shared signal wired distribution line; converting, by using the first hybrid converter, the first frequency transmission to a third orthogonal multi-carrier wireless transmission having a third frequency; converting, by using the second hybrid converter, the second frequency transmission to a fourth orthogonal multi-carrier wireless transmission having the third frequency; and creating a downlink ubiquitous coverage in the selected area by transmitting the third and the fourth transmissions, each comprising a common MAP over a first sub-channel, a common payload over a second sub-channel, and a first private payload and a second private payload, correspondingly, over a third sub-channel, wherein the third and fourth transmissions are at least partially coverage-overlapping and are synchronizing and bandwidth allocating a first wireless client and a second wireless client.

Methods and systems for Ubiquitous coverage OFDM hybrid point to multipoint communication system, including the steps of: determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common wireless communication channel, by using a wireless point to multi point centralized synchronizing communication controller; transmitting to the air a download multi carrier transmission, via the common wireless communication channel using a first wireless frequency, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation; receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter; shifting the frequency of the download multi carrier transmission from the first wireless frequency to a second wireless frequency in the first hybrid converter and in the second hybrid converter; and transmitting the frequency-shifted download multi carrier transmission to the air from the first hybrid converter and from the second hybrid converter using the second wireless frequency, wherein the transmission coverage areas of the first and of the second hybrid converters are at least partially overlapping, and wherein the first wireless client is located in the overlapping coverage area.

A point-to-multipoint communications system. The system uses an antenna to generate a single beam having independently steerable, narrow lobes. The phase array and amplitude array distributions used to form the lobes are controlled so that the lobes track and provide full duplex communication links with two or more RF terminals in two or more remote locations. In certain embodiments the dual lobe beam is generated from a fixed, ground-based location, and in other embodiments the single beam is generated from an airborne mobile platform, a mobile land vehicle, or a marine vessel. The various embodiments all enable one, two or more full duplex communication links to be established and maintained with a single beam.

In an Orthogonal Frequency Division Multiplexing communication system wherein a frequency bandwidth is divided into multiple sub-bands, a method and a scheduler is provided for configuring channel quality feedback for a point-to-multipoint communication session involving multiple users equipment (UEs). The scheduler receives multiple channel quality measurements from the multiple UEs and, based on the multiple channel quality measurements, determines whether to implement a frequency selective channel quality feedback scheme or a non-frequency selective channel quality feedback scheme for the point-to-multipoint communication session. The scheduler then implements the determined channel quality feedback scheme. In another embodiment of the invention, the scheduler may determine whether to implement a frequency selective or non-frequency selective channel quality feedback scheme based on a number of UEs serviced by the scheduler.

Methods and systems for hybrid point to multipoint communication systems, including the steps of: determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common communication channel; transmitting a download multi carrier transmission, via a shared signal wired distribution line, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation; receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter connected to the shared signal wired distribution line; shifting the frequency of the download multi carrier transmission from a wired distribution line frequency to a wireless frequency in the first hybrid converter and in the second hybrid converter; and transmitting the frequency-shifted download multi carrier transmission to the air from the first hybrid converter and from the second hybrid converter.

Methods and systems for hybrid point to multipoint communication systems having multiple downlink channels and a single uplink channel, including the steps of: centrally allocating bandwidth to, and synchronizing communications with, a first and a second wireless clients; transmitting, over a shared signal wired distribution line, a first downlink signal transported over a first frequency, a second downlink signal transported over a second frequency, and an uplink signal transported over a fifth frequency; converting the frequency of the first downlink signal to a third frequency, and bi-directionally wirelessly communicating with a first wireless client over the third frequency; converting the frequency of the second downlink signal to a fourth frequency, and bi-directionally wirelessly communicating with a second wireless client over the fourth frequency; and converting and superpositioning a first received wireless uplink signal having the third frequency and a second received wireless uplink signal having the fourth frequency to the uplink signal that is transmitted over the shared signal wired distribution line using the fifth frequency.

Methods and systems for filtering and enhancing the uplink reception sensitivity of OFDMA hybrid point to multipoint communication systems, including the steps of: determining transmission synchronization and bandwidth allocation for a plurality of wireless clients; communicating with the wireless clients via a plurality of hybrid converters connected to a shared signal distribution line, by using a wireless point to multi point centralized synchronizing communication controller and an OFDMA modulation; receiving wireless upload transmission by using the hybrid converters; and blocking non-information carrying sub-carriers, received by at least one of the hybrid converters, before superpositioning the received wireless upload transmissions on the shared signal distribution line.

Some embodiments of the invention provide devices, systems and methods of point to multipoint communication. For example, an apparatus in accordance with an embodiment of the invention includes a resource allocator to allocate a wireless communication channel resource to one or more stations of a wireless communication system based on a net benefit function that takes into account an overhead incurred by controlling the allocation of said channel resource.