76 results about "Periodic broadcast" patented technology

A networking conferencing and collaboration tool utilizing an enhanced T.128 application sharing protocol. This enhanced protocol is based on a per-host model command, control, and communication structure. This per-host model reduces network traffic, allows greater scalability through dynamic system resource allocation, allows a single host to establish and maintain a share session with no other members present. The per-host model allows private communication between the host and a remote with periodic broadcasts of updates by the host to the entire share group. This per-host model also allows the host to allow, revoke, pause, and invite control of the shared applications. Subsequent passing of control is provided, also with the hosts acceptance. The model contains no fixed limit on the number of participants, and dynamically allocates resources when needed to share or control a shared application. These resources are then freed when no longer needed.

The invention relates to an emergency message multi-hop broadcast transmission method based on vehicle to vehicle cooperation. The method comprises the steps of effectively identifying the positions, speeds, driving directions, channel quality and the relevant information by a vehicle node by virtue of periodic broadcast beacon information; selecting an optimum coordinating vehicle by the vehicle according to the relevant information of surrounding neighbors, and placing an IP (Internet Protocol) address of the coordinating vehicle into emergency information so as to obtain data with consistent formats, and then broadcasting the emergency information to the surrounding vehicle nodes; broadcasting the information to the latter vehicles after the coordinating vehicle receives the information without the need of setting retreating and waiting time, judging the moving directions and position relationships of the coordinating vehicle and a vehicle subjected to a sudden accident by other vehicles, and then deciding to adopt corresponding measures or discard the information. Compared with the prior art, the emergency message multi-hop broadcast transmission method has the advantages of being high in emergency information transmission reliability, being efficient to transmit and the like.

The invention discloses a base station switching method and a system in wireless communication. The base station switching method comprises the following steps: step 1, a satellite positioning system is used for measuring periodic broadcast message of a satellite, and meanwhile, an inertia measurement system arranged on a mobile station is used for measuring operating states of the mobile station; step 2, data of the measuring results of the satellite positioning system and the inertia measurement system are fused, the accurate position and speed information of the mobile station can be obtained, the distance and the path from the mobile station to a base station can be calculated, and time moving to an appointed switching point under the current speed can be calculated; and step 3, when the mobile station moves to the appointed switching point, handover is carried out. The base station switching method solves the problem that instability and time-lag in the process of switching according to signal strength in switching technology cause problems, solves the problem of switching failure and communication outage when the satellite has operation faults in the satellite positioning auxiliary switching technology, and guarantees stable and continuous proceeding of communication of the mobile station.

A contention-free activation/deactivation mechanism in PRACH, which allows dynamic allocation of the contention-free and contention-based preambles. This allows contention-free preambles which have been allocated to a UE to be revoked once contention-free operation is no longer needed, or cannot be supported due to a shortage of preambles. In one embodiment, a terminal is configured (S12) with a contention-free preamble by specific signalling, and thereafter monitors periodic broadcasts (S14) indicating the set of contention-free preambles; if the configured preamble is within the set (S16, “Y”), the preamble is activated for contention-free operation (S18); otherwise (S16, “N”), the preamble is deactivated and the terminal should follow the contention-based procedure (S20).

The invention discloses a Mesh and clustering combination-based wireless sensing network channel scheduling method. Each node point carries out respective task dispatching periodically in the network, and the communication among the node points is realized. The channel scheduling method adopts the main concept that in intra-cluster communication, after a dispatching cycle of a upper layer node point is formed, a lower layer node point can be informed in a periodic broadcast Beacon frame form, so that the lower layer node point is added into the clusters established by the upper layer node point and to maintain the clock synchronization of the upper node point; in inter-cluster communication, backbone nodes takes charge of route setup and inter-cluster data transmission. The channel scheduling method effectively solves the problems that the interference of the intra-cluster high power communication to the inter-cluster communication and the excessive idle listening of the node point through the division of the intra-cluster communication time interval and the introduction of the sleeping mechanism of the node point. The channel scheduling method provided by the invention is suitable for a certain part of typical wireless sensing network utilization, and simultaneously can be used as an expanding basis for other wireless sensing network.

The invention discloses an edge computing task processing and scheduling method and device in an industrial Internet environment, and the device comprises the steps that an information feedback modulecollects periodic broadcast information of a base station associated with each set user equipment UE in a target region and transmits the periodic broadcast information to an information analysis andprocessing unit, a terminal equipment monitoring unit collects or receives the monitoring information of each UE and sends the monitoring information to the information analysis and processing unit,an information monitoring module collects real-time parameter data of each UE and sends the real-time parameter data to a heterogeneous data processing unit, a service priority processing unit and a terminal equipment monitoring unit, the information analysis and processing unit generates a state feedback result corresponding to the UE according to the received information and sends the state feedback result to the information feedback module and an equipment flow overall scheduling module, and a scheduling module generates an overall resource scheduling instruction according to the state feedback result and the feedback information of a task unloading decision unit, sends the overall resource scheduling instruction to each MEC through the information feedback module, and sends the condition information of the MEC to the task unloading decision unit.

The invention discloses a vehicle network routing method. The vehicle network routing method includes the following steps: 1) vehicle nodes periodically broadcast location information obtained from a GPS (Global Positioning System) receiver, and each vehicle node stores location information in the latest two data packages of the neighboring nodes; 2) each vehicle node serves as a source node after receiving a broadcast data package, and the current locations of the neighboring nodes on a map are predicted according to the location information that is sent through the latest two periodic broadcasts and stored by the source node; 3) the node nearest to a destination node is selected from the neighboring nodes to serve as a forwarding node of the data package, and the data package is forwarded from the source node to the forwarding node; 4) the forwarding node continues to forward the data package and gradually approaches the destination node until the destination node is one of the neighboring nodes. Through exponential smoothing prediction, routing can be achieved according to the predicted location information, so that the routing accuracy and efficiency are improved. The vehicle network routing method has the characteristic of simplicity as well as rapidness of calculation.

This disclosure provides a system of intelligent lights together with control devices and sensors communicating over a wireless network, with methods to allow the lights to take actions based on logical combinations of events generated by other devices. The lights can function autonomously as they have built-in functions of logic processing, storage and wireless communications which allow them to receive events and take actions according to the stored logic configuration data. Complete freedom in the grouping of lights as well as association of control devices and sensors to each individual lights is enabled by this system architecture. Seamless communication coverage is enabled by a wireless protocol that allows the light to form a mesh network. The discovery of devices in the network and their capabilities/services, as well as the setting up of the logic configuration data for the lights, are performed by a smart phone or similarly device with user interface, which facilitates simpler hardware for the lights as well as making it easy to add new devices and discovering their capabilities/services. Additional functions of the intelligent lights are location-based services using periodic broadcast data packets transmitted from the lights, as well as receiving broadcast data packets from other devices.

The invention discloses a threshold adaptive adjustment method based on statistical priority multiple access, and mainly solves the problems that the prior art cannot deal with unknown service proportion or emergency service conditions, the channel utilization rate is low and the high-priority service transmission reliability is poor. According to the scheme, the method comprises the steps of 1) setting an upper bound T of a sending threshold of each priority queue; 2) by a node, counting transceiving information of the frame and periodically broadcasing the transceiving information to a neighbor node; 3) by the node, calculating a frame success transmission probability P according to the received neighbor node statistical information; 4) setting different stable intervals omega accordingto whether the current channel has the highest priority service transmission condition or not; and 5) comparing the omega value with the P value, adjusting the priority threshold value according to acomparison result, and returning to the step 2) to repeat the process. The method can be suitable for the emergency service conditions and unknown service proportion, each service can better access the channel, the channel utilization rate is effectively improved, and the service quality of the service is guaranteed.

The invention discloses an offshore mobile sensor network routing maintenance method based on a cluster ring mechanism; the offshore mobile sensor network comprises a sensor node, set nodes and a UAVunmanned aerial vehicle; the offshore mobile sensor network routing maintenance method based on the cluster ring mechanism comprises the following steps: set structure network establishment, UAV mobile access, cluster ring message periodic broadcast, intra-set node multi-hop routing, and dynamic routing in a complex environment. According to the maintenance method, the path distance for multi-hoptransmission of the data to the UAV by each sensor node can be reduced, network energy consumption is balanced, the method is applicable to various network shapes; meanwhile, network topology routingis optimized, and frequent changes of the mobile sensor network topology structure under a severe seaborne environment are self-adapted through the dynamic routing.

The invention relates to a method for monitoring a Wi-Fi label through multiple terminals. The method comprises the following steps that: S1, a monitoring terminal accesses in a personal login manner; S2, a label and the monitoring terminal respectively record ANonce and SNonce generated in the handshake process for four times, and then obtain a new random seed by calculation according to ANonce and SNonce; S3, the label obtains a new digital signature by calculation according to the new random seed, a currently broadcasted random seed and a pre-shared key; S4, the label and the monitoring terminal obtain same random number sequences R by calculation according to the new random seed and the pre-shared key, and respectively store the same random number sequences R locally; S5, the label updates the currently periodic broadcast random seed and the digital signature, and updates the currently cyclic broadcast random number sequences to R; S6, the monitoring terminal regularly scans the random number broadcasted by the label and compares the random number with the random number in the local random number sequences R so as to verify the authenticity of the label; and S7, ending.

The present invention discloses a method and device for distribution of communication resources. The method comprises: receiving a communication resource distribution request sent by a vehicle user VUE, wherein the communication resources comprise time resource and frequency resource; determining a subarea where the VUE is located and the required resource unit quantity according to the communication resource distribution request; and in a communication resource pool corresponding to the subarea, selecting one group of communication resources according to the resource unit quantity, and distributing the communication resources to the VUE to allow the VUE to perform periodic broadcast information report according to the VUE. The scheme is employed to optimize the current method of dynamic dispatching and distribution of communication resources of a base station so as to solve the technical problem of large signaling cost.

The invention relates to the field of position services, particularly to a position privacy protecting method. According to the position privacy protecting method, a whole service area is divided into n*m mesh areas, position service information is correspondingly partitioned into every mesh area Iij; every mobile device is provided with a cache for caching the corresponding position service information; when processing the Iij, a mobile device P in a sub area Cij periodically broadcasts a beacon Bp to the neighboring devices to inform the neighboring devices that the sub area processes the corresponding position information; if other mobile devices in the Cij area receive the beacon and meanwhile do not process the Iij, the neighboring device which has the highest signal quality is chosen for providing Iij information; other devices obtaining the Iij through a mixed receiving mode; when needing the position information and if not having the information in the cache, one mobile device can require the information from a server. The position information privacy protecting method improves the transmission efficiency of the position information, reduces the dependency of users on position servers more effectively and improves the privacy security of the position services.

The invention belongs to the technical field of satellite communication, and particularly relates to a dynamic network access method and device based on a concealed satellite communication system, andthe system comprises a satellite and a user terminal. The method comprises the following steps: the satellite broadcasts channel information according to a set fixed period, wherein the broadcast channel information carries resource information and a satellite ID number; the user terminal monitors channel information broadcasted by the satellite in real time, acquires the channel information, analyzes the channel information to enter a silent mode, and triggers a dynamic network access process according to whether a service demand exists or not. The signaling interaction process is simplified, and the network access time is greatly reduced.

Spatial listen before talk (LBT) with broadcasting or multicasting reception is disclosed. Aspects of the disclosure provide for managing spatial LBT transmissions between broadcast communication nodes and neighboring cells. In one aspect, the broadcast transmitter transmits a preamble that identifies the broadcast transmission durations and the non-broadcast durations in the upcoming transmit opportunity. The potential interferer would read the preamble and yield any transmissions during the broadcast durations. Additional aspects provide for a periodic broadcast clear-to-send (CTS) signal transmitted by the broadcast receivers. The interferer may use the broadcast CTS to perform spatial LBT during the broadcast durations. Further aspects allow the broadcast receivers to determine when potential interferers would cause interference above a threshold. In such circumstances, the broadcast receivers would send the CTS to allow the interferer to perform spatial LBT during the broadcast durations.

The invention discloses a dynamic time-space domain resource allocation access method based on a directional antenna, which comprises the following steps of: 1, monitoring a scanning message of a sending node, and updating a local resource allocation table; 2, periodically broadcasting resource allocation information of nodes; 3, counting the demand number; 4, judging whether to release the time slot or apply for the time slot according to the required number of the sending time slots; 5, generating an application or release message according to the request type and the request mechanism; 6, enabling a receiving node to analyze and confirms request items in the request message according to the time slot application request message or the time slot release request message and the resource allocation table, generate a confirmation message and update the resource allocation table; and 7, enabling a sending node to update the resource allocation table according to the received acknowledgement message. According to the invention, the nodes can obtain the right to use more beam channels in the current time slots, and the channel utilization rate and throughput are improved.

The invention provides a data file receiving method in a mobile multimedia broadcasting system. The method comprises the following steps of: A, receiving a File Attribute Table (FAT) of the periodic broadcast of a server by a terminal, when the preset condition is satisfied, judging whether the FAT is completely received, if so, executing a step C, otherwise, requesting missing FAT fragments from the server, and executing a step B; B, receiving the missing FAT fragments returned by the server by a terminal; C, receiving a file of the periodic broadcast of the server by a terminal, when the preset condition is satisfied, judging whether the file is completely received, if so, ending the processing, otherwise, requesting missing file fragments from the server; and D, receiving the missing file fragments returned by the server by a terminal. The invention simultaneously discloses a terminal and a server. By using the scheme of the invention, the receiving time of the data file can be reduced so as to further improve the user experience.