68 results about "Beam hopping" patented technology

A downlink beam frame signal processing system (100) for a communication satellite includes a packet switch (608) that routes self addressed uplink data to a memory (804). The memory (804) stores queues for at least a first and a second downlink beam hop locations (302, 304). The processing system (100) also includes a power amplifier (108) that amplifies a waveform formed using the uplink data. A power gating circuit (1200) coupled to the power amplifier (108) includes a power gate input (1216) responsive to a power gating signal to remove RF power from at least a portion of the waveform before transmission.

The invention discloses a satellite-ground synchronization method for an on-satellite processing beam-hopping satellite communication system, and belongs to the technical field of satellite communication. By periodically inserting the beam hopping plan corresponding to the beam position into the downlink frame, the ground terminal can be effectively assisted to realize the fast access of the uplink in the beam hopping environment. In addition, in combination with the working principle of the phased-array antenna, the satellite-borne time transmission method oriented to phased-array antenna beam hopping application is provided, and the time reference consistency among multiple phased-array antennas and between each wave position receiving beam and each wave position transmitting beam is effectively ensured. The synchronous control time sequence of the phased-array antenna is provided, the beam switching serial data and the wave speed switching control pulse signal are separately transmitted, the beam switching serial data are sent in advance before the beam switch control pulse is sent, the protection time in the beam switching process is shortened, and the transmission efficiency of the beam hopping application is effectively improved.

A method, and associated equipment, for dynamically allocating resources in a satellite network comprising at least one satellite configured to form a plurality of satellite beams and terminals, comprises the steps of: clustering the beams into groups of beams, allocating frequency resources to each of the groups of beams, determining geographical zones in which these frequency resources can be used simultaneously, determining a hop frame comprising first timeslots, in which the frequency resources are allocated to the whole set of terminals of one of the beams of the group, and second timeslots, in which the frequency resources are allocated to a subset of terminals of at least one beam of the group, identifying the subset of terminals and allocating to the terminals of the frequency resources, and uploading of information relating to the overall loading of each of the beams.

A phased array antenna system having a corporate waveguide distribution network stripline printed circuit board. The stripline printed circuit board receives electromagnetic (EM) wave energy from a 1×4 waveguide distribution network input plate and distributes the EM wave energy to 524 radiating elements. The stripline circuit board enables extremely tight spacing of independent antenna radiating elements that would not be possible with a rectangular air filled waveguide. The antenna system enables operation at millimeter wave frequencies, and particularly at 44 GHz, and without requiring the use of a plurality of look-up tables for various phase and amplitude delays, that would otherwise be required with a rectangular, air-filled waveguide distribution structure. The antenna system can be used at millimeter wave frequencies, and in connection with the MILSTAR communications protocol, without the requirement of knowing, in advance, the next beam hopping frequency employed by the MILSTAR protocol.

The invention provides a satellite communication system resource scheduling method combining beam hopping and precoding. The method comprises the following steps: establishing a beam hopping time slotallocation target function based on service priority; obtaining a time slot allocation optimal solution by using a convex optimization method, and obtaining a time slot allocation matrix of each wavebeam according to the optimal solution; analyzing the time slot allocation result of each wave beam, and finding out the wave beams with serious same-frequency interference according to the same-frequency multiplexing distance; designing precoding of a transmitting end, and performing interference suppression and elimination on beams with same-frequency interference in the beam hopping resource allocation scheme; according to the resource scheduling method provided by the invention, dynamic scheduling of satellite resources is satisfied, performance reduction caused by same-frequency interference is avoided, and the resource utilization rate and the system capacity are improved.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Disclosed are a method and an apparatus for performing adaptive beam hopping in a multi-cell multi-user communication system. The method includes: making a request for allowing multiple accesses for beam hopping for a predetermined operation time to a plurality of accessible base stations (BSs); receiving a response to the request from two or more BSs among the plurality of BSs and determining, according to a predetermined reference, beams above the reference among transmission beams of the two or more BSs as available beams; determining a beam hopping pattern based on the determined available beams and transmitting the determined hopping pattern to the two or more BSs; and forming reception beams based on the determined beam hopping pattern to receive signals.

The invention provides a high-throughput satellite communication system beam hopping method. According to the method, uniform clustering is carried out on total beams according to a business requirement, an objective function is established for the requirement, whether edge beam distance of adjacent clusters is equal to 2R and the same are in working status is monitored, if not, performance satisfies direct calculation of frequency spectrum efficiency, and if yes, an interference avoidance measure is taken, then the frequency spectrum efficiency is calculated, a KKT condition is used for solving of time slot allocation numbers of a closed-form solution, finally, rounding-down is carried out according to values of the closed-form solution, the same is optimized, and optimal capacity allocation is obtained. The method has the advantages that a dynamic requirement of capacity can be satisfied, frequency spectrum efficiency can be improved, and performance decreasing caused by interferenceof the same frequency can also be avoided.

Based on the condition of multi-beam cellular networking in the current satellite network, The invention provides a QoS (Quality of Service)-guarantee-based method for combining load balancing of adjacent beams and hopping beams. According to the method, the quality of service guarantee of users is considered, load balancing is carried out by utilizing the characteristic that multiple beams of theusers in the adjacent beam overlapping coverage areas can be unloaded, meanwhile, the problem that beam center users cannot be unloaded is solved by adopting a beam hopping technology, the packet loss rate of beams of the whole network is effectively reduced, and the effective throughput of each beam of the whole network is improved. By effectively utilizing idle resources of the whole network, the problem of resource distribution bipolarization caused by non-uniform user distribution is solved, the average packet loss rate of the network is effectively reduced, and the network throughput isimproved.

The embodiment of the invention discloses a low-orbit satellite beam scheduling method based on a beam hopping communication system, and the method is characterized in that the method comprises the steps that S10, a user station autonomously calculates the number of a current wave position where the user station is located; S30, the user station carries a wave position number and effective time ofwave position duration in the service application information and reports the wave position number and the effective time to the satellite base station; S50, the satellite base station uniformly schedules beam resources to perform beam projection service according to the wave position number of the user station and the effective time of the wave position duration. According to the method, on theone hand, the satellite computing pressure can be reduced; on the other hand, the air interface transmission pressure can be reduced, the user station does not need to report own position informationin real time, and the computing pressure of the satellite base station and the air interface transmission pressure can be effectively reduced, so efficient beam pointing scheduling is realized, and the resource allocation response time is prolonged.

Provided are an improved procedure and associated hardware to allow a satellite to switch antenna coverages according to predefined repetitive sequences, and to align switching of the antenna sequence with ground data sequence switching. The disclosed technique enables a beam hopping sequence to be changed without losing connectivity between the satellite and ground segment.

The invention discloses a dynamic resource allocation method for a beam-hopping satellite system based on deep reinforcement learning. The method comprises the following steps: step 1, establishing a service model of a forward link of a beam-hopping GEO satellite system; step 2, storing a data packet of a service arriving at a ground wave position in each time slot in a data packet buffer queue; step 3, utilizing a degree reinforcement learning algorithm to model a resource allocation module of the satellite into an intelligent agent, and designing state input of the intelligent agent, an output decision action of the intelligent agent and an award of an evaluation action; 4, simulating the deep reinforcement learning algorithm in the step 3, and continuously training decision neural network weight parameters of the deep reinforcement learning algorithm; and step 5, completing dynamic allocation of the resources of the beam-hopping satellite system by using the decision neural network obtained by training in the step 4, and solving an optimal scheme of resource allocation of the beam-hopping satellite system. According to the invention, the transmission delay of the data packet is reduced, and the throughput of the beam-hopping satellite system is improved.

A satellite communication system is arranged for consecutively illuminating a plurality of contours on earth. The satellite communication system includes a modulator adjusting its transmission of data and dummy data to detected switching time instants, without causing too long delays or buffer overflows, or without impacting a return link synchronization. Traffic can be seamlessly switched to a redundant transmitter which is aligned with the beam hopping satellite to efficiently and reliably achieve synchronization.

A downlink frame processing system (200) includes a packet switch (608) routing self addressed uplink data (706) from an input port to an output port, a memory (804) coupled to the output port, and a downlink scheduler (802) coupled to the memory (804). The memory (804) includes storage for at least two downlink beam hop locations (302, 304). The downlink scheduler (802) processes from one of a plurality of segments at least one scheduling entry (1312) that includes, for example, a header field (1316) defining at least one of a payload and frame type (1404) for at least one of a payload and frame (1200) to be transmitted, and payload data pointers (1502, 1504, 1506) into the memory (804).

A system and method for timing synchronization of satellite switching instants with gateway switching instants is described. The method includes: generating satellite switching instants according to a Beam Hopping Time Plan (BHTP); generating gateway switching instants according to the BHTP; transmitting a channel addressed to a plurality of beams hopped according to the BHTP based on the gateway switching instants, wherein each of the plurality of beams includes a signal including timing markers and a guard period at an end of the signal for the respective beam; receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for the generating of the gateway switching instants, based on the synchronization information, for a transmission of the channel such that at least a portion of the guard period in a respective signal for a respective beam aligns with one of the satellite switching instants; and adjusting a timing and a symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.

A controller device for a satellite communication system has one or more beam hoppers during a hopping period which each illuminate a plurality of contours according to a hopping plan indicating an order in which the plurality of contours is illuminated. The controller device comprises a dynamic hopping plan calculation module for calculating the hopping plan and is arranged for conveying the calculated hopping plan to a transmitter of the satellite communication system. The dynamic hopping plan calculation module is arranged to calculate the hopping plan by subdividing, per beam hopper, the hopping period in at least two scheduling frames, the at least two scheduling frames forming the calculated hopping plan. Each scheduling frame comprises hopping slots each indicating a contour to be illuminated.

A data routing subsystem (200) for a communication satellite includes an inbound module (602) that accepts demodulated uplink data. The inbound module (602) includes a routing table (702) that stores queue tags (714) specifying downlink beam hop locations (302, 304) for the uplink data. The subsystem (200) also includes a self addressed packet switch (608) having an input port coupled to the inbound module (602), and an outbound module (610) coupled to an output port of the switch (608). A memory (804) in the outbound module (610) stores the uplink data in accordance with the downlink beam hop locations (302, 304). A multiple beam array antenna (116–122) is coupled to the outbound module (610). The multiple beam array antenna (116-122) includes a first feed element (116) assigned to a first downlink beam hop location (302) and a second feed element (118) assigned to a second downlink beam hop location (304).

Disclosed is a communication method of a satellite and a ground station and apparatuses performing the same. The communication method includes transmitting a plurality of frames to a satellite based on a beam hopping time plan (BHTP) of the satellite and a ground station and synchronizing the BHTP based on an index of a frame received through a beam switching window (BSW) allocated to the ground station among the plurality of frames, and an identification value indicating at least one sub-frame included in the frame.

A method is provided for conveying communications within a satellite communication network, by implementing a beam hopping technique for communicating with half-duplex user terminals.

The invention discloses a hopping beam resource allocation method taking a user service weight gain as a target function. The method comprises the following steps: calculating the service volume and time delay tolerance of each cell at the current time slot; establishing an optimization problem based on a decision problem with maximization of the deviation by taking the maximum total deviation of all attributes to the decision scheme as a target; solving the optimization problem, and determining an optimal attribute pair decision scheme; and performing resource allocation on each cell according to the optimal attribute decision scheme, and completing hopping beam resource allocation taking the user service weight gain as a target function. The method can meet real-time business service requirements and improve the overall throughput of the system.

The invention belongs to the technical field of satellite communication, and discloses a low-orbit satellite communication system-oriented beam-hopping communication method and satellite load equipment, and the method comprises the steps: dividing beam-hopping loads into transparent beam-hopping loads and processing beam-hopping loads according to whether a gateway station is visible or not, carrying out beam hopping processing; selecting a hopping beam communication mode combining cluster coverage and single-user independent coverage according to user characteristics; and periodically broadcasting time information on the satellite, highly reliably receiving the time information on the satellite on the ground, carrying out deviation analysis and supplement, and carrying out feed link hopping beam synchronous communication on the satellite based on ground synchronization. According to the invention, the processing complexity of the hopping beam load is optimized by combining the transparent hopping beam and the hopping beam processing technology, and the use flexibility of the system is improved; and the complexity of the low-orbit network and the complexity and resource overhead of on-satellite load processing are simplified.

The invention relates to the technical field of communication, in particular to a beam hopping control method and device for a transparent forwarding satellite, which are used for improving beam control accuracy. The method comprises the following steps: a ground gateway station generates corresponding beam control information based on terminal resource configuration information corresponding to a terminal, and sends the beam control information to the transparent forwarding satellite, and enabling the transparent forwarding satellite to control the hopping of the hopping beam and the effective time point of the hopping beam based on the beam control information. Therefore, the ground gateway station sends the beam control information including the synchronization identifier, the beam effective time information and the beam adjustment information to the transparent forwarding satellite, so that the transparent forwarding satellite can accurately control the hopping of the hopping beam and the beam effective time based on the beam control information; the timing uncertainty brought by the time from ground gateway station resource allocation to satellite beam execution is shortened, and the beam control accuracy is further improved.

The invention relates to a low-orbit satellite constellation-oriented beam-hopping multiple access method. The method comprises the following steps of: constructing a self-similar information source model of a user and a beam-hopping time slot model of a low-orbit satellite constellation; time slots are distributed according to user requirements, and beams corresponding to the user groups are activated; and in the allocated time slot, performing power domain superposition on service flow data of a plurality of users in a beam coverage range by adopting a power domain multiple access method through the activated hopping beam, and sending the service flow data to a low-orbit satellite. And the low-orbit satellites serving as the receiving ends extract the received multiple user signals by adopting an interference elimination method. The utilization rate of resources on the satellite is improved from the two dimensions of time and power; in other words, all the beams do not need to work at the same time, and part of the beams are selected according to needs to send and receive multi-user signals; meanwhile, the service quality of multi-user terminal access is improved; and the requirements of various users are met while resource allocation is dynamically carried out.

The invention relates to a switching method of a satellite mobile terminal based on a beam hopping scene. The method comprises the following steps: acquiring channel retention time of a terminal, analyzing new call average channel retention time and switching call channel retention time of the terminal, randomly distributing the terminal in each cluster, and obtaining a new connection request arrival rate when switching requests and new connection request arrival rates are independent Poisson processes, analyzing the switching request arrival rate, according to the switching request arrival rate and the channel retention time, analyzing the average connection time of the terminal under the wave beam, and according to a probability density function, analyzing to obtain a new connection blocking rate and the probability that all time slots are occupied; obtaining a switching failure rate according to the probability that the time slot is not released within the maximum queuing time and the probability that the terminal keeps active connection all the time in the overlapping area; and when the switching failure rate is smaller than or equal to the threshold, if convergence occurs, outputting the switching failure rate and the new connection blocking rate, so that the switching failure rate of the high-speed terminal is reduced.