3530results about How to "Improve communication quality" patented technology

Exploiting the substantive reciprocity of internode channel responses through dynamic, adaptive modification of receive and transmit weights, enables locally enabled global optimization of a multipoint, wireless electromagnetic communications network of communication nodes. Each diversity-channel-capable node uses computationally efficient exploitation of pilot tone data and diversity-adaptive signal processing of the weightings and the signal to further convey optimization and channel information which promote local and thereby network-global efficiency. The preferred embodiment performs complex digital signal manipulation that includes a linear combining and linear distribution of the transmit and receive weights, the generation of piloting signals containing origination and destination node information, as well as interference-avoiding pseudorandom delay timing, and both symbol and multitione encoding, to gain the benefit of substantive orthogonality at the physical level without requiring actual substantive orthogonality at the physical level.

This invention relates to a method for performing Power Headroom reporting procedure, adapted for a user equipment, wherein the user equipment is operated in a plurality of activated serving cells, the method includes the steps of: providing a prohibitPHR-Timer; obtaining a plurality of downlink path loss values respectively corresponding to the activated serving cells; triggering a power headroom report when the prohibitPHR-Timer expires or has expired and at least one of the downlink path loss values has changed more than a PathlossChange threshold since the last transmission of a PHR; and reporting the power headroom report.

A cell load balancing method, a cell load measuring method, and devices thereof are provided. The cell load balancing method includes: acquiring information of the load of a current cell and information of the load an adjacent cell; determining a target cell in which a mobility parameter needs to be modified thereof according to the information of the load of the current cell and the information of the load of the adjacent cell; sending a parameter modification request to the determined target cell; and performing a corresponding operation according to information indicating whether the parameter is successfully modified and fed back from the adjacent cell. With the above solution, a load balancing solution can be better implemented in a network, thereby improving a capacity of the network, improving a success rate of user access, and reducing access delay.

From an electric pole outside to a cordless handset inside a building / facility, a communication line is established via an electric power line. At this point, it is judged whether or not electric power line communication is possible, and if electric power line communication is possible, the communication line between the cordless handset and a base unit is switched to an electric power line communication system, and a communication line is formed via an optical fiber cable from the electric power line. By measuring the communication quality levels of all lines of the wireless and electric power lines, the communication line having the highest communication quality level may be selected.

A medium streaming distribution system reduces effects of packet loss in a network before the packet reaches radio base station. A medium distribution device for packet-transmits via the base station, a medium stream to the network by a real time transmission protocol. A packet analyzer monitors the packet arriving at the radio base station and transmits feedback Information associated with loss of a packet to the medium distribution device. Based on the feedback from a relay device and a terminal device of the medium stream, the transmission rates from the medium distribution device to the relay device and from the relay device to the terminal device are obtained to provide a greater transmission rate in a surplus band for re-transmission or a forward error correction.

A relay apparatus for relaying a packet in radio communication by a wireless terminal in a communication area includes a packet monitoring part for obtaining data on a bandwidth to be used in the radio communication by the wireless terminal from a packet to be relayed, a bandwidth managing part for calculating and recording a total bandwidth in use used for the radio communication by the wireless terminal from the obtained data on a bandwidth, a retransmission adjusting part for determining an upper limit of a packet retransmission number, in accordance with an amount of an available bandwidth obtained by excluding a total bandwidth in use from a maximum bandwidth, and a retransmitting part for retransmitting a packet in a range not exceeding the upper limit of the packet retransmission number. Consequently, the relay apparatus enables retransmission appropriately adaptable to a use situation of a bandwidth by wireless communication of a wireless terminal in a communication area.

To secure a communication path between a distribution server that distributes content to clients and a terminal apparatus of a content distributor more reliably while content is distributed by live distribution. In a content supply system 100, in order to use a streaming server 102 to perform a live distribution, a user PC 106 to be used makes a reservation for a time zone, etc. to a server reservation control center 101 over the Internet 103. When the reservation is accepted and the content is sent from the user PC 106 to the streaming server 102, data is sent via a dedicated server connection network 108.

A relay system stores destination information of both end systems for which communications are relayed, the sequence number of the one of the end systems is connected with a high quality transmission path, an ACK response number, a re-transmission count, etc. in a connection management table. Upon receiving a re-transmitted packet from the one of end systems, the relay system searches for the connection management table containing a matching sequence number, and increments the re-transmission count in the table by 1. If the re-transmission count has not reached a certain number, the relay system relays the re-transmitted packet as it is to the other end system.

The invention discloses a collaborative interaction method for an unmanned plane cluster and a visual navigation system of an unmanned plane. The collaborative interaction method for the unmanned plane cluster comprises the following steps of: determining unmanned planes satisfying a collaborative condition in a communication coverage area of a certain unmanned plane by the unmanned plane in the unmanned plane cluster, and establishing an unmanned plane collaboration group according to the unmanned planes satisfying the collaborative condition; determining inter-plane routes of multiple unmanned planes in the unmanned plane collaboration group; allocating collaborative tasks to multiple unmanned planes in the unmanned plane collaboration group according to link state information of the inter-plane routes; and evaluating the link state according to the motion state of multiple unmanned planes in the unmanned plane collaboration group, and updating unmanned planes in the unmanned plane collaboration group and the collaborative task of each unmanned plane according to an evaluation result. The collaborative interaction method for the unmanned plane cluster is good in real-time, strong in reliability and high in communication quality, and can better adapt to an unmanned plane cluster communication environment during visual navigation.

Disclosed is a distributed antenna system that selects an antenna in accordance with the position of a mobile terminal and reduces the variation in the total number of mobile terminals using each antenna while maintaining adequate communication quality. In the distributed antenna system in which a large number of antennas are distributively disposed, an antenna group including antennas having good communication quality is selected in accordance with the position of a mobile terminal. Further, in accordance with the communication quality and load status of a current antenna group and with the communication quality and load status of a post-change antenna group, which is obtained by changing some antennas in the current antenna group, the post-change antenna group is formed by changing some antennas in the current antenna group with which a mobile terminal using a heavily loaded antenna communicates.

A channel response matrix is obtained by performing a training process between a transmitter 401 and a receiver 402 to obtain optimal signal phases of the antenna array. Next, a singular-value decomposition (SVD) process is performed to decompose the channel response matrix into a correlation matrix and eigenvalues. Next, a diagonal matrix having square roots of the eigenvalues as its components is obtained. Next, all but one of diagonal components included in the diagonal matrix are replaced with zeros, and optimal setting of the amplitudes and phases of signals to be applied to the antenna array (antenna weight vector) for use in wireless communication between the transmitter and the receiver is obtained based on a channel response matrix that is reconstructed by using the component-replaced diagonal matrix. In this way, when wireless communication is implemented by performing beam forming, the time necessary to find and set a beam direction can be reduced.

The antenna matching circuit control device with an antenna body includes a sensing module, a processing module, a power adjusting module and a frequency adjusting module. The sensing module senses an object that approaches the antenna body and outputs a sensing signal accordingly. The processing module is coupled to the sensing module and outputs a first control signal and a second control signal according to the sensing signal. The power adjusting module is coupled to the processing module and controls a power amplifier to couple with one of a plurality of first matching circuits according to the first control signal. The frequency adjusting module is coupled to the antenna body and the power adjusting module. The frequency adjusting module controls one of a plurality of second matching circuits to couple with one of the first matching circuits according to the second control signal.

A signal processing apparatus in a multi-input / multi-output (MIMO) communication system includes a transmitting end in which a code rate is differently set and a respectively different modulation method is performed at each antenna in consideration of a channel situation of each transmission antenna, coded bits are separately interleaved, and then collectively interleaved to transmit data, and a receiving end in which received data is collectively deinterleaved and then decoded and deinterleaved separately according to each reception antenna, and a channel situation of each signal received from multiple transmission antennas is estimated and fed back to the transmitting end. A different coding rates and modulation method are used at each transmission antenna and the spatial interleaving is performed to obtain a diversity gain in a space domain, and thus, the communication quality can be enhanced.

A method of and apparatus for beam steering. A feed horn is arranged so that the feed horn illuminates a tunable impedance surface comprising a plurality of individually tunable resonator cells, each resonator element having a reactance tunable by a tuning element associated therewith. The tuning elements associated with the tunable impedance surface are adjusted so that the resonances of the individually tunable resonator cells are varied in a sequence and the resonances of the individually tunable resonator cells are set to values which improve transmission of information via the tunable impedance surface and the feed horn.

The invention discloses a simultaneous common-frequency full duplex self-interference offset method in a multi-path environment. The method comprises the steps that in the transmission end, a digital signal to be transmitted is sent to a signal pre-correction module and a digital interference offset module, and a radio frequency signal to be transmitted is sent to a radio frequency interference reconstruction unit. The signal outputted by the signal pre-correction module passes through a DAC (digital-to-analog converter) and a transmission radio frequency channel to form a pre-corrected radio frequency signal. In the receiving end, the outputted self-interference signal subtracts the pre-corrected radio frequency signal and the radio frequency signal processed by the radio frequency interference reconstruction unit, the radio frequency self-interference offset is finished, and the offset signal, the pre-corrected radio frequency signal and the converted digital signal are sent to the digital interference offset module to finish the digital interference offset, together with the digital signal to be transmitted and the pre-corrected digital signal. The simultaneous common-frequency full duplex self-interference offset method under the multi-path environment is applicable to a simultaneous common-frequency system, the utilization rate of spectrum is doubled, the radio frequency self-interference offset performance is improved, the communication quality of the system is improved, and the working stability of communication equipment in a simultaneous common-frequency multi-path environment is improved.

An AICH control circuit (14) outputs, to an AICH generating Circuit (3), RACH resource information from an RACH resource management circuit (13), SIR information from a finger part (4), error rate information from a decoding part (5), and a call processing control signal. The AICH generating circuit (3) uses AICH information from the RACH resource management circuit (13) and an AICH control signal.

A portable wireless device realizing high-speed transmission in downlink communication in a used state that a foldable portable wireless device is held in a hand of the user and ensuring a high antenna radiation efficiency. In the portable wireless device, platy conductors (1, 3, 4) are arranged in the longitudinal direction on the back of a display section (35) of an upper case (5). The signal of a transmission circuit (25) is distributed by a power distributor (18). One signal is fed to a platy conductor (1) through a phase shifter (17) and the other is fed to the platy conductor (3) or the platy conductor (4) from a high-frequency switch (19) through a transmission / reception duplexer (20) or a transmission / reception duplexer (21). The high-frequency switch (19) selectively feeds power to either the platy conductor (3) or the platy conductor (4) according to the signal from a gravity sensor (26). The received signal is extracted by the transmission / reception duplexers (20, 21), amplified by a receiving circuit (22) and a receiving circuit (23), and multiplied by a predetermined weight coefficient by a demodulating section (24) and combined.

A radio communication system of an HARQ method that makes an HARQ transmission interval of subpackets appropriate and reduces data transmission delay resulting from subpacket retransmission. In the radio communication system in which a packet is transmitted and receives with the HARQ method between a base station and multiple radio mobile stations, each of the base station and the multiple radio mobile stations has: a packet transmission circuit for transmitting subpackets in predetermined intervals; a packet reception circuit for repeating decoding processing by combining a newly received subpacket and a previously received former subpacket until an original packet is successfully decoded; and a HARQ control equipped with a function of, for packet communication whose data length is short, transmitting a subpacket or response from the packet transmission circuit in an HARQ transmission interval that is shortened from the HARQ transmission interval of the normal mode.

A device and method for continuous outer-loop power control on a physical channel which transmits only power control bits and no data while in discontinuous transmission (DTX) mode in a CDMA mobile communication system is disclosed. In the power controlling device according to one aspect of the present invention, a frame error detector detects an error from a frame of predetermined length and generates an error signal indicating whether an error has been generated. A closed-loop power controller compares a threshold with the signal-to-noise ratio (SNR) in each power control group (PCG) in a plurality of periods of the frame and generates power control information according to the comparison result. An outer-loop power controller increases the threshold in order to generate power control information that commands a power increase in response to an error signal indicating the existence of a frame error, and decreases the threshold in order to generate power control information that commands a power decrease in response to an error signal indicating the absence of a frame error. An offset controlling unit, which is connected to the outer-loop power controller, receives gating information about the gated transmission of data in a frame at a predetermined rate, and generates an offset signal, which indicates an offset corresponding to a changed gating rate if the gating rate is changed.

The invention provides a method and a device for migrating users in a high-speed railway communication network, which comprises the following steps: obtaining the speed state of a user terminal according to a plurality of speed values and at least one preset speed threshold value reported by the base station within the speed deciding period; obtaining the movement state of the user terminal according to the speed state of the user terminal; sending measurement control information to the user terminal according to the movement state and characteristic information of a high-speed railway communication network in which the user terminal is positioned; causing the user terminal to carry out 1G / 2A event measurement and / or the period measurement of the neighbor cell to the appointed neighbor communication cell, and reporting a measurement report; and migrating the user terminal to a target communication cell according to the measuring results reported by the user terminal. According to the technical scheme disclosed by the invention, low-speed users can be migrated out of the high-speed railway communication network so as to improve the communication quality of high-speed users under the condition of ensuring the normal communication of the users.

It is provided a wireless communication system comprising base stations that communicate with a terminal. Each of the base station has antennas. Each of the base stations transmits a first reference signal unique to each of the antennas which does not overlap with another antenna among the base stations at least in a vicinity thereof. The terminal receives the first reference signal and estimates a received power of the first reference signal for each of the antennas, selects antennas suitable for communication from among the antennas based on a result of estimating the received power, and transmits a result of selecting the antennas to the each of the base stations. The each of the base stations refers the result of selecting the antennas transmitted from the terminal, assigns the selected antennas belonging to different cells to the terminal, and notifies the terminal of a result of assigning the antennas.

A method for intelligently switching on / off an antenna of a mobile terminal and a corresponding mobile terminal are provided. A method includes: detecting a current working frequency band and a surrounding environment of a terminal; and according to a preset correspondence among an antenna radiation unit, an environmental condition, and the current working frequency band, changing impedance characteristics of a parasitic unit radiator. Another method includes: detecting a current working frequency band of a terminal; and according to a preset correspondence between an antenna radiation unit and the current working frequency band, changing impedance characteristics of a parasitic unit radiator. Another method includes: detecting a current surrounding environment of a terminal; and according to a preset correspondence between an antenna radiation unit and an environmental condition, changing impedance characteristics of a parasitic unit radiator. The terminal includes: a detection unit, an antenna control unit, and an antenna radiation unit.

A system and method for effectively exchanging photo data in an instant messaging environment includes a first device coupled to an electronic network for utilizing a first messaging program and a first messaging display to create text messages for performing messaging procedures. A photo data source such as a digital camera is configured to capture photo data when the first device is instructed to transmit the text messages by activating a “send message” icon on the first messaging display. The first messaging program automatically creates and transmits photo messages that include the photo data and corresponding text messages. A second device coupled to the electronic network may then utilize a second messaging program to receive and display the text messages and photo data from the transmitted photo messages upon a second messaging display. The second device may also similarly create and send reciprocal photo messages to the first device during the foregoing messaging procedures.

The invention discloses a wave tracking method, a device and a system, which belongs to a communication technology field, can quickly find and in-time be swiched to a backup link from an optimal link, or be switched from the optimal link to the backup link, and effectively raise handling capacity of the system links. The wave beam tracking method comprise: a wave beam tracking initiator sends a wave beam tracking request to a wave beam tracking responder; the wave beam tracking initiator receives an enhanced wave beam tracking training auxiliary sequence sent by the wave beam tracking responder based on the enhanced wave beam tracking request; and when determaining whether needed to be swiched to the backup wave beam link based on a received detection result of the enhanced wave beam tracking training auxiliary sequence, the wave beam tracking initiator sends a first link swich information to the wave beam tracking responder.

Disclosed is a method for controlling a routing path for a voice-over-internet protocol service based on a mobile internet protocol and a session initiation protocol, the method including the steps of sensing a mobile terminals entry into a different network and performing a mobile internet protocol re-registration; the mobile terminal transmitting a register message, which includes a Foreign Agent Care-of Address and a home address of the mobile terminal, to a session initiation protocol server after performing the mobile internet protocol re-registration through a foreign agent, thereby carrying out a session initiation protocol registration; the session initiation protocol server creating a tunnel between the session initiation protocol server and the foreign agent with reference to the register message when receiving an invite message from a correspondent terminal after the session initiation protocol registration is carried out, and transmitting the invite message to the mobile terminal through the tunnel.

A packet transferring / transmitting method is provided for use in a mobile communication system 50. In this packet transferring / transmitting method, an upper node 1 determines the implementation of handover (determination step), and a handover addressing node 2 transfers, of a plurality of packets, a non-transmitted residual packet to a handover addressed node 3, and the upper node 1 transmits a new packet to the handover addressed node 3 (transfer / transmission step). This enables maintaining the number of users to be accommodated while securing a wide bandwidth, sharing a line with high efficiency at soft handover, avoiding data residual in the case of the employment of variable communication rate, and preventing an increase in retransmission.

The invention discloses a wave beam updating method applied to sender equipment. The method comprises: after candidate transmitting beam information sent by receiver equipment is received, a transmitting beam for updating a current transmitting beam is selected based on the candidate transmitting beam information; transmitting beam indication information carrying a selection result of the candidate transmitting beam by the sender equipment is sent to the receiver equipment; and data are transmitted to the receiver equipment by using the selected transmitting beam. According to another embodiment, the invention also discloses a wave beam updating method applied to receiver equipment. The method includes: candidate transmitting beam information is sent to sender equipment; after transmitting beam indication information sent by the sender equipment is received, an updated transmitting beam is determined based on the transmitting beam indication information; and data are received on a receiving beam corresponding to the updated transmitting beam. Therefore, the good communication quality of a communication link can be kept and a transmission problem caused by communication link deterioration can be solved. Besides, the invention also discloses wave beam updating equipment.

A cell load balancing method, a cell load measuring method, and devices thereof are provided. The cell load balancing method includes: acquiring information of the load of a current cell and information of the load an adjacent cell; determining a target cell in which a mobility parameter needs to be modified thereof according to the information of the load of the current cell and the information of the load of the adjacent cell; sending a parameter modification request to the determined target cell; and performing a corresponding operation according to information indicating whether the parameter is successfully modified and fed back from the adjacent cell. With the above solution, a load balancing solution can be better implemented in a network, thereby improving a capacity of the network, improving a success rate of user access, and reducing access delay.

The embodiment of the invention provides an antenna switching device and a mobile terminal. The antenna switching device comprises an antenna switching module and a controller, wherein at least three antennae are respectively in corresponding connection with a transmitting and master receiving channel and at least two slave receiving channels through the antenna switching module; and the controller is respectively connected with a radio frequency transceiver circuit and the antenna switching module, when the mobile terminal is in a non-sleep mode, the controller determines the antenna with the highest received signal strength in the at least three antennae which are connected with the antenna switching module every preset time and controls the antenna switching module to switch the transmitting and master receiving channel to connect with the antenna with the highest received signal strength. According to the antenna switching device and the mobile terminal provided by the embodiment of the invention, each downlink antenna can be guaranteed to receive signals simultaneously, and the antenna with the highest received signal strength in the at least three antennae can also be randomly selected to transmit uplink signals, the defects of the prior art can be solved, and the communication quality of the mobile terminal can be greatly improved.

The invention discloses a same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method. A wireless unit receiving end outputs self-interference signals, self-interference offset is not conducted at first, after being processed by a radio frequency receiving channel and an analog-digital converter, the self-interference signals are sent to a pattern recognition module to generate an adjustment value, multiple taps are controlled to interfere in a reconstruction filter to reconstruct sending end radio frequency signals in a radio frequency mode, radio frequency self-interference offset is conducted on output reconstruction signals through a summator, signals after the radio frequency self-interference offset are sent to an adjustment algorithm module again through the radio frequency receiving channel and the analog-digital converter to obtain digital signals which are sent to the adjustment algorithm module, an adjusting value needed for adjusting the time delay zero is obtained, radio frequency interference reconstruction is further controlled, controlling over the radio frequency interference reconstruction is carried out repeatedly according to the method, and self-interference offset is achieved. According to the same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method, joint control of the pattern recognition module and the adjustment algorithm module is used, same-time same-frequency-radio self-interference can be removed effectively, the frequency spectrum utilization rate is improved, the radio frequency self-interference offset performance is improved, and the working stability of communication equipment is guaranteed.