61 results about "Wireless network" patented technology

A method is provided for performing a clear channel assessment in a wireless network. The method involves first listening for channel energy on a wireless channel. Whatever channel energy is heard over the wireless channel is demodulated into non-synchronized in-phase and non-synchronized quadrature phase components. Each of the non-synchronized in-phase and non-synchronized quadrature phase components are squared, and then the non-synchronized in-phase component is multiplied by the non-synchronized quadrature phase component to produce an I−Q product. The sum of the squared non-synchronized in-phase component, the inverse of the squared non-synchronized quadrature component, and double the I−Q product is determined as a clear channel assessment input value. A carrier signal detection function is then performed on the clear channel assessment input value to produce a clear channel assessment output value, which is used to determine whether a signal is present in the wireless channel.

The invention relates to a method and a system for playing a television program at a mobile terminal and a digital television receiving terminal. The method comprises the following steps that: the mobile terminal establishes communication linkage with the digital television receiving terminal; the terminal mobile transmits a triggering command to the digital television receiving terminal; the digital television receiving terminal receives the triggering command, analyzes the triggering command into a command signal, and executes a corresponding action according to the command signal; and the mobile terminal receives and plays a television live program transmitted by the digital television receiving terminal. The method, the system and the like provided by the invention can transmit the television live program to a mobile phone through a wireless network, such as a WIFI home network, so that the television live program on a set-top box is switched to the mobile phone; and therefore, the television live program on the set-top box can be watched through the mobile phone whenever and wherever possible without wasting the traffic of the mobile phone.

Provided a method and device for efficiently retransmitting packets of which transmissions failed in wired/wireless network including detecting continuity by detecting whether or not a sequence ID of a received packet is continuous with a start sequence ID or an end sequence ID of packets included in reception blocks which are generated in advance of the received packet; depending on the result of the detection, manipulating reception blocks to renew or delete the reception blocks or generate a new reception block by using the sequence ID of the received packet; and transmitting an EBN (Explicit Block NACK) for requesting retransmission of lost packets in units of a block when discontinuity is detected.

The invention discloses a mobile QRC (quick response code) hydropower station inspection system, comprising an intelligent system client connected to a wireless network that is connected with a firewall, the firewall is connected to a server, the server is connected to a management terminal and a central database, and display screen I is fixed to the surface of the intelligent system client. A support platform for the mobile QRC hydropower station inspection system is implemented mainly by using intelligent mobile equipment loaded with Android; as Android is highly extensible, daily inspection tasks are easily run on the corresponding intelligent mobile equipment, it is possible to carry out management and analysis according to a fault sheet uploaded by an inspector, communication is made timely with the inspector for methods of handling, an interactive platform is formed, and working and management levels of a whole team are increased accordingly.

The invention relates to a WiFi signal test method and system. The method comprises setting a plurality of different-class test software, which comprises reference test software, positive deviation software and a negative deviation software, in advance; connecting a wireless network card with a to-be-tested WiFi product through the test software; controlling, through the test software, the to-be-tested WiFi product to send power to the wireless network card to perform a sending performance test, and controlling the to-be-tested WiFi product to receive the power sent by the wireless network card to perform a receiving performance test; and, when a deviation between a power value sent by the to-be-tested WiFi product and a power value received by the wireless network card is within a predetermined first threshold, and when a deviation between a power value received by the to-be-tested WiFi product and a power value sent by the wireless network card is within the predetermined first threshold, the to-be-tested WiFi product is qualified, otherwise the to-be-tested WiFi product is not qualified. The WiFi signal test method and system do not need to use an expensive WiFi signal test instrument to perform the test, the expense of testing is reduced, and cost is saved.

The invention discloses a skid-mounting full integration LNG and LCNG remote monitor unattended filling station, belongs to a liquefied or compressed gas supply system, and particularly relates to a skid-mounting full integration LNG and LCNG on-site substation. The skid-mounting full integration LNG and LCNG remote monitor unattended filling station comprises an LNG storage tank, a pump skid, a boost skid, a filling device and a control and monitor device which are installed on a skid body. The skid body is provided with an explosion-proof variable-frequency speed regulator connected to an LNG immersed pump and an LCNG plunger pump, an explosion-proof electric appliance cabinet connected to electric equipment, and the on-site substation using an PLC controller and with input terminal connected to sensors and control terminal connected to valves. The filling station is in no need of constructing a switching room, a control room, a duty room, an office and a rest room on site. Therefore, investment for constructing the station is reduced and construction time is shortened. When wireless network is used, the data of substations can be shared; and the site is in no need of management personnel, maintenance personnel and duty personnel basically.

The invention belongs to the field of Internet of Things communication, and relates to a multi-layer gateway data transmission system and method based on LoRa positioning, and the system comprises anLoRa terminal, an LoRa main gateway, a plurality of LoRa auxiliary gateways, a network server, and an application server. The terminal communicates with the at least three auxiliary gateways in respective allocated time slots by adopting the TDMA technology; each main gateway is connected with three auxiliary gateways; the main gateway is connected with the server through TCP/IP; the main gatewaytransmits data to the DTU, when the DTU is in a working state, the main gateway continuously sends the data to the DTU, and when the DTU is in a dormant state, the main gateway stores the data and waits for the DTU to wake up and then transmits the data again; the DTU transmits the data to a network server through a wireless network; the application server receives the data transmitted by the network server and calculates the positioning position of the terminal. According to the invention, the gateway is subjected to multi-layer processing, so that the stability, data security and transmission efficiency of the gateway are improved.

The invention provides a sleep system which comprises a control module, a health monitoring module, a health information judgment module and a displaying and alarming module. The control module is used for controlling shape of a mattress and controlling the mattress to heat and vibrate according to signals fed back by the health information judgment module, the health monitoring module is used for monitoring sign information of a user and transmitting the same to the health information judgment module through a wireless network, the health information judgment module is used for storing the sign information of the user in real time and performing data analysis, judgment and evaluation, and the displaying and alarming module is used for receiving signals fed back by the health information judgment module and performing information displaying or acousto-optical alarming prompting. By the sleep system, posture of the mattress can be adjusted or a heating function can be provided according to sleep information and human body health information, and sleep quality of the user is improved greatly.

The invention provides a network connection method, a network connection device and a terminal. The network connection method comprises the steps of judging whether the SSID (Service Set Identifier), BSSID (Basic Service Set Identifier) and connection password of the wireless network access point are correspondingly stored in a preset safe network list or not when a wireless network access point is scanned; obtaining preset authentication information corresponding to the wireless network access point when the judging result is yes, encrypting the preset authentication information through a preset encryption key and sending the encrypted preset authentication information to the wireless network access point; detecting whether the response information of the wireless network access point for the encrypted preset authentication information is received or not; and determining whether to establish connection with the wireless network access point by employing the connection key or not according to the response information when it is detected that the response information is received. According to the technical scheme, the security of automatic connection with a wireless network can be effectively improved, the connection with phishing is avoided, the information security of the user is ensured, and the use safety experience of the user is improved.

The invention provides a car movement device with information leakage prevention. The device comprises a dimensional code information note, a car owner sending end, a car movement request sending end, a server, a car owner receiving end, a GPS positioning chip, a wireless network and a mobile terminal. The dimensional code information note is arranged at the front end face of the owner car and is internally provided with the GPS positioning chip. The car owner sending end is connected to the car movement request sending end through the dimensional code information note. According to the car movement device, through the cooperation of the dimensional code information note, the car movement request sending end, the server and the car owner receiving end, when the device is used, the dimensional code information note with car owner information is pasted to a car, when other cars are stopped by the car, the owner of the stopped card can scan the dimensional code information note by using the car movement request sending end in a hand, enter into the server and send the car movement request information to the car owner, the car owner receives the car movement request information and can move the car as soon as possible, and the device is very convenient.

The invention provides a mobile video monitoring system based on cognitive radio. The mobile video monitoring system comprises a control center and a mobile terminal. The control center is wirelessly communicated with the mobile terminal through an ISM frequency band. The control center is used for monitoring communication quality and determining whether spectrum sensing and channel switching need to be carried out or not according to the communication quality. If data transmission between the mobile terminal and the control center cannot be recovered through the channel switching, the data transmission of the mobile terminal is relayed through a relay robot. The invention further provides a mobile video monitoring method. According to the mobile video monitoring system and the method, the unfixed communication frequency band is adopted, and in the ISM frequency band, channel interference is automatically sensed and avoided, and the interference problem is solved. The wireless signal fading problem is solved through power control and relay transferring, and therefore the real-time performance and reliability of video transmission are guaranteed. The mobile video monitoring system and the method do not depend on the coverage of the commercial wireless network, and have actual application significance in video monitoring in the emergency environment, the severe environment and the unknown environment.

The invention discloses a multifunctional intelligent backpack which comprises a backpack main body, a mobile terminal and a cloud server. The backpack main body is connected with the mobile terminal and the cloud server through a wireless network separately and comprises an altitude height measuring system, an air pressure detecting and weather forecasting system, a hiking identifying and reminding system, a charging and discharging managing system, a massaging system, an illuminating system and an object tracking system. According to the multifunctional intelligent backpack, the detects that in a traditional method, the altitude height cannot be measured, and self-adaptive detection cannot be conducted on an ambient environment are solved; the intelligent backpack can identify the landform in the area range, conduct dual identification on the altitude height and the landform according to a GPS and air pressure values and achieve the functions of hiking step counting, illuminating, object tracking and the like.

The invention discloses a video monitoring system of an electric power construction field. The video monitoring system comprises monitoring devices, a wireless network, a server and a monitoring terminal device. The monitoring device is provided with a video collecting module and a digital processing module. The monitoring device is provided with a wireless communication module, and the server is provided with a wireless communication module. According to the video monitoring system of the electric power construction field, the monitoring device is used for obtaining video data which are transmitted into the server through the wireless network, the monitoring terminal device is used for calling the video data in the server, and remote monitoring on the electric power construction field is achieved. The system can save human resources. In addition, the real-time performance of the system is high, problems can be found in time, and the construction field can be monitored comprehensively and continuously by increasing the number of the monitoring device. In addition, the invention discloses a video monitoring method of the electric power construction field.

The invention discloses a transmission method for adaptive streaming media in a wireless network environment, and proposes an adaptive streaming media data transmission method which does not depend onthroughput prediction and network prior knowledge. A code rate selection problem is formally described into a random optimization problem; personalized demands of a user are added into a code rate selection decision; and maximization of user experience quality is taken as the objective. The method implements optimization in multiple aspects of video definition, playing smoothness and the like, and moreover, decision calculation cost and complexity are reduced, so that real-time performance of code rate level switching is further improved.

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

The invention belongs to the technical field of illuminating systems, and in particular relates to an illuminating lamp system for an underground garage. The illuminating lamp system comprises intelligent illuminating lamps, each intelligent illuminating lamp comprises a lamp main body, connecting hanging lugs are arranged on the top face of the lamp main body, a light source module is arranged inthe middle of the lamp main body, navigation light sources are arranged on two sides of the light source module, LED lamp beads are arranged inside the light source module and the navigation light sources, the lamp main body is provided with infrared sensing devices, a sound sensing module, a wireless lamp intelligent control module and a working state indicating lamp, and a circuit interface isarranged on the top face of the lamp main body. The system comprises wireless network modules, middle control modules and wireless infrared sensing modules, and the wireless network modules, the middle control modules and the wireless infrared sensing modules are in wireless connection with the intelligent illuminating lamp. For the system, with the wireless connection control mode, the working amount for wiring design and construction is reduced, through the intelligent control mode realizing unattended operation, the illumination control flexibility is improved, and thus the management costof the underground garage is reduced.

The invention relates to the technical field of unmanned aerial vehicles, in particular to a light-load long-distance cruising unmanned aerial vehicle group system. The system comprises a ground control base station and at least one unmanned aerial vehicle group. The at least one unmanned aerial vehicle group comprises at least one main control unmanned aerial vehicle and N controlled unmanned aerial vehicles. AAT full-automatic tracking holders and wireless network bridges are carried on the ground control base station and the main control unmanned aerial vehicle. The AAT full-automatic tracking holders and the wireless network bridges are used for point-to-point transmission of control instructions between the ground control base station and the main control unmanned aerial vehicle. A router is carried on the main control unmanned aerial vehicle, wifi modules are carried on the N controlled unmanned aerial vehicles, and signal communication and instruction transmission are carried out between the main control unmanned aerial vehicle and the controlled unmanned aerial vehicles through wifi signals. According to the technology, the whole unmanned aerial vehicle group can fly farther and is higher in cruising ability, the adopted radio wave signals enable the unmanned aerial vehicle group to have the functions of investigation prevention and better concealment, and the unmannedaerial vehicle group can execute tasks in mountainous areas and seismic zones without 4G, 5G or other signals.

The invention discloses a checking-in locating system which comprises a management system server, a GIS server, a locating SP, a PC terminal and a wireless signal emitting device. The checking-in locating system is characterized in that the management system server comprises a shell, the center of the inner wall of the bottom of the shell is connected with an ARM9TAMI series embedded processor through a screw, a GIS server and the locating SP are connected with the signal input end of a processor through signal lines, the signal output end of the processor is connected with the signal input end of the PC terminal through a signal line, and the locating SP is connected with the wireless signal emitting device through a wireless network. The checking-in locating system and a human resource system are used in an integrated mode, the checking-in system to which a user can logs in at different geographic positions and network positions is achieved, checking-in sites can be distributed, multiple checking-in tasks can be completed flexibly, and the limit of time and space on common checking-in systems is avoided.

A multi-cast download method for downloading an image file is applicable to downloading the image file from an image file server to a computer. The multi-cast download method includes the steps of establishing a wire network connection and a wireless network connection in the computer, in which the wire network connection connects the computer and the image file server; and simultaneously performing a retransmitted packet receiving process and the following steps. The image file is downloaded from the image file server to the computer in a multicast manner by using the wire network connection. When a lost packet is detected, a packet retransmitting request corresponding to the lost packet is sent by using the wireless network connection and Transmission Control Protocol (TIC).