125results about How to "Good channel quality" patented technology

The present invention is directed to wireless communication, and more particularly, to providing improved signal quality using antenna beam selection and/or switching techniques. Embodiments of the present invention may measure the carrier-to-interference (C/I) level for each channel and for each antenna. Embodiments of the present invention assign forward-link signals to antennas such that only one forward-link signal is transmitted from a respective antenna. Moreover, embodiments prioritize assignment to antennas by the forward-link power, i.e., the forward-link signal associated with the highest power is transmitted from the antenna associated with the best channel quality metric for reverse-link of the respective channel. Additionally, embodiments may employ the assignment scheme with antennas that possess spatial, polarization, and/or directional diversity to minimize the effects of shadow fading.

This invention relates to ARQ mechanism for data link layer error control in the wireless data communication system, and reforms the unreliable wireless physical link into the reliable data logical link to provide the reliable data transmission sphere for the network layer. Compared with the existing ARQ mechanism, this invention greatly increases the acknowledgement rate, yet does not reduce thethroughput rate, greatly lowers the data band-width of acknowledgement, and therefore more data band-width can send the backward data to support two-way data transmission. By fixing the length bit map and relative bias, in accordance with error data PDU distribution, this invention automatically select the acknowledgement type with the highest acknowledgement efficiency to confirm the part of data PDU that need the most acknowlegement in the reception window.

The invention relates to a double-channel data transmitting method in optical fiber differential protection. The method is characterized in that: when only one channel is functioning, a protection device carries out synchronous adjustment at the time of sampling according to the data of the functioning channel; when two channels are functioning and power is on, the channel (confirmed for 3 times) with less time delay is preferably chosen as the synchronous adjustment channel; when the two channels are functioning and the time delay of the two channels only differs a little (less than 0.6ms), the channel A is chosen as the synchronous adjustment channel; when the synchronous adjustment channel is disabled, the other normal functioning channel is chosen as the synchronous adjustment channel. When the time delay of the synchronous channel is larger than the time delay of the other channel (the difference is lager than 0.3ms) and the difference continues for 10s, the other channel is chosen as the synchronous adjustment channel.

The invention discloses a CA (Carrier Aggregation)-based across-carrier scheduling method and a CA-based across-carrier scheduling device. According to the CA-based across-carrier scheduling method and the CA-based across-carrier scheduling device, disclosed by the invention, the activation of across-carrier scheduling can be selected and completed by a PDCCH (Physical Downlink Control Channel) CC (Component Carrier) under the across-carrier scheduling by utilizing the load and the channel quality of a PDCCH of each CC and combining the user number admission control on the CC, thus scheduling signals of SCCs (Secondary Component Carriers) of all across-carrier scheduling users can be transmitted through a better PDCCH CC, the success probability of transmitting the scheduling signals of the SCCs is increased, the resource utilization rate of a business channel is increased, and finally, the system performance is promoted.

The invention provides a relay emergency wireless data communication frame. A relay net is formed by a single low-altitude relay platform; the relay platform is hung below a balloon tied on a rope fixed on a trolley; and an application scene is a land cellular network with one part of damaged base stations and fewer base stations (reserved base stations) which can realize physical connection. A low-altitude relay physical layer can utilize a cognitive radio technology to detect signal frequency spectrums of the reserved base stations so as to carry out radio resource management of emergency data communication; the relay platform can realize following functions: 1) connection close to line-of-sight propagation is provided for a land user; 2) the position of the relay platform is adjusted to guarantee that links among the relay platform and a plurality of land base stations have better channel quality; 3) a certain cognitive radio function is realized; 4) communication with an external network is realized by a gateway which is used as the reserved base station.

The invention discloses a secure transmission method based on relay strategy selection and resource allocation in a relay OFDM (Orthogonal Frequency Division Multiplexing) network. A communication system model employed by the method comprises a sending node S, N destination receiving nodes (D <1>...D <N >), an eavesdropping node Eve and K relay nodes. The method comprises the steps of for data transmission of each time, in a second time slot, after relay strategy selection and resource allocation, sending data to the relay nodes by the sending node S; and in a second time slot, selecting one of the K relay nodes as a forwarding node to forward the data received in the first time slot to the destination node D, and moreover, eavesdropping information sent to N users by the eavesdropping node Eve. Compared with traditional modes of merely employing AF (Amplify-and-Forward) or DF (Decode-and-Forward), the method has the advantages that a lower private interruption probability is obtained in a relay strategy selection mode, and the performance difference between the method and the two traditional modes is more remarkable under a high signal to noise ratio.

UE 100-1 transmits null-steering control information for directing a null to the UE 100-1 in a transmission from eNB 200-2 to UE 100-2, and first channel quality information on a modulation and coding scheme recommended when the null-steering control information is adopted in the eNB 200-2, to eNB 200-1. The UE 100-1 controls to transmit, instead of transmitting the first channel quality information or in addition to transmitting the first channel quality information, second channel quality information on a modulation and coding scheme recommended when the null-steering control information is not adopted in the eNB 200-2, to the eNB 200-1.

The invention discloses a quality of service-oriented downlink radio resource allocation method of a user-centered network, comprising the following steps: (1) calculating an actual signal X<m><k,t>(i) sent by a base station m to a user k on a subcarrier i and a total signal T<k,t>(i) received by the user k; (2) calculating the channel quality C<k,t>(i) under a ZFBF coding strategy, and establishing a utility function of the radio resource allocation problem; (3) performing collaborative user selection according to the utility function of the radio resource allocation problem, and determining collaborative users communicating on each subcarrier; (4) calculating the MU-MIMO-ZFBF pre-coding coefficient according to the result of collaborative user selection and the determined collaborative users communicating on each subcarrier; and (5) calculating the optimal transmitting power of delay-sensitive users and the optimal transmitting power of rate-sensitive users, thus completing quality of service-oriented downlink radio resource allocation of the user-centered network. Through the method, quality of service-oriented resource allocation can be carried out based on user requirements.

The invention discloses a power supply control system and control method. The power supply control system is used for controlling the opening or closing of computer nodes in a computer cluster system and comprises a control terminal and a plurality of power supply control nodes connected by a wireless grid network, wherein the control terminal is suitable for acquiring route information and transmits a control signal to the power supply control nodes in a wireless way; the control signal carries an active address, a destination address, route information and information for the computer nodes to be controlled; the power supply control nodes are connected between the control terminal and the computer nodes, is suitable for receiving and analyzing the control signal and controlling the opening or closing of the corresponding computer nodes on the basis of the information for the computer nodes to be controlled; and when the power supply control nodes are the power supply control nodes pointed by the destination address, the power supply control nodes forward a control signal to the wireless grid network on the basis of the analyzed route information. The power supply control system has the advantages of strong extensibility and high safety.

The invention provides a method for adjusting the CCE (control channel element) aggregation level in a cluster service, a base station and a monitoring terminal. The method comprises the steps that the base station sends group signaling to a group in a periodic mode, wherein the group signaling carries configuration information used for indicating the monitoring terminal to configure SR (scheduling request) resources in a PUCCH (physical uplink control channel); a first time, which is acquired by calculating in the current period, of DCI (downlink control information) sent to the group is sent to the monitoring terminal, thereby enabling the monitoring terminal to report SR signals to the base station on the SR resources when a second time calculated in the current period of the received DCI is less than the first time, wherein the monitoring terminal is located at an uplink self-synchronization state, the base station detects whether the SR signals are received on the SR resources, the aggregation level of a CCE is up-regulated to a target aggregation level from the current aggregation level if the SR signals are detected on the SR resources, and the DCI is sent to the group according to the target aggregation level of the CCE in the next period. The base station flexibly adjusts the aggregation level of the CCE according to the SR signals fed back by the monitoring terminal.

The invention belongs to the technical field of wireless communication, and discloses an unmanned aerial vehicle relay deployment method and system based on a particle swarm optimization algorithm. The unmanned aerial vehicle relay deployment method comprises the steps of: designing and defining a channel model of an unmanned aerial vehicle relay, calculating the large-scale fading path loss and small-scale fading of the unmanned aerial vehicle relay, and acquiring the channel gain and signal-to-interference-and-noise ratio of different equipment during connection; designing and defining an energy consumption model of an unmanned aerial vehicle relay, and defining power consumption compositions of the unmanned aerial vehicle in a hovering state; constructing an optimization target, and converting a constrained mixed 01 integer nonlinear programming problem into an unconstrained optimization problem; and optimizing the transmitting power of the terminal equipment, the candidate deployment position of the unmanned aerial vehicle relay and the association relationship of the terminal equipment, the unmanned aerial vehicle relay and the channel in combination with the improved particleswarm algorithm so as to realize the minimization of the total energy consumption of the system. According to the unmanned aerial vehicle relay deployment method, a standard particle swarm algorithmis improved, the unmanned aerial vehicle relay deployment method is more suitable for solving the optimization problem, and the execution efficiency of the algorithm is improved.

The invention relates to a hybrid access method based on partial resource sharing. The method comprises the following steps: browsing all available resources of each femtocell, and dividing all the available resources of each femtocell into public resources and private resources, which correspond to each femtocell; determining a femtocell base station subjected to candidate access, which correspond to accessed MUE (Micro User Equipment), and collecting and acquiring an MUE assembly which is subjected to candidate access and corresponds to each femtocell; and for each femtocell, selecting the MUE from the MUE assembly subjected to candidate access and accessed the selected MUE into the femtocell, and the accessed MUE and FUE (Femtocell User Equipment) accessed into the femtocell share the public resources of the femtocell. The invention also relates to a hybrid access system based on partial resource sharing. According to the invention, difference between PRBs (Physical Resource Blocks) is drawn into consideration, the available resources of the femtocell are divided into the public resources and the private resources. The MUE accessed into the femtocell can use the part of public resources, so that part of the MUE seriously interfered by the femtocell is accessed into the femtocell, the channel quality of the MUE is improved, accordingly, the throughput of the MUE is improved under the condition that the FUE throughput is ensured.

Apparatuses, methods, and systems are disclosed for conditional handovers involving multiple candidate cells. One apparatus (102) includes a receiver (212) that receives (602) a handover command involving multiple candidate cells. The apparatus (102) includes a processor (202) that selects (604) a target cell of the multiple candidate cells in response to the target cell meeting a predetermined condition.

The invention discloses an FDMA-based unmanned aerial vehicle measurement and control cellular communication method. The method comprises the following steps: establishing a hybrid base station; constructing a cellular communication network by using the hybrid base station; allocating a downlink frequency band, an uplink frequency band and a broadband frequency band to the cellular communication network; allocating a narrowband downlink frequency band and a narrowband uplink frequency band to each unmanned aerial vehicle; selecting a movable base station of the unmanned aerial vehicle from thehybrid base stations, and adjusting the direction of an antenna unit of the movable base station; sening notification information to the unmanned aerial vehicle, so that the direction of the unmannedaerial vehicle antenna unit is matched with the direction of the base station antenna unit of the movable base station by the movable base station; broadcasting a telemetry frame signal in a narrowband downlink frequency band by the unmanned aerial vehicle; receiving the telemetry frame signal and performing demodulation, decoding and frame format analysis by the movable base station to obtain atelemetry frame; and forwarding the telemetering frame by the movable base station to a main console. T through the FDMA technology, signal interference between unmanned aerial vehicles is avoided, multiple unmanned aerial vehicles can be accommodated, and the multiple access problem of an unmanned aerial vehicle measurement and control system is solved.

A method, a communication system and a user entity for communicating channel state information in a communication system are provided. The system includes at least one radio transmitter for providing a communication link to at least one user entity, when in the coverage area of the radio transmitter, wherein the communication system includes a first communication resource for transmitting channel state information to the radio transmitter from the user entity, and a second communication resource for transmitting additional channel state information to the radio transmitter from the user entity. An indication indicating whether the user entity has additional channel state information to be communicated on the second communication resource from the user entity is transmitted in a first message on the first communication resource.

The invention discloses a process industry control system based on a wireless field subnetwork and channel assessment. The system comprises a basic wireless network and a field wireless network, wherein the basic wireless network is formed by adding wireless access points on the basis of conventional wireless networks or Ethernet gateways, and the gateways and the wireless access points form a mesh network to form the basic wireless network serving as a backbone network and an access network of the field wireless network. The wireless technology in the control system is used for formation of an own architecture, functional characteristics of wireless communication are brought into full play, and reliability and instantaneity of the process industry control system and channel quality are improved.

The invention discloses a pr-coding matrix selection method for a closed loop multiple input multiple output system. The method comprises the following steps of: traversing all pre-coding matrixes, and calculating values of carrier to interference and noise ratios (CINR) corresponding to the pre-coding matrixes respectively; and obtaining modulation and coding scheme (MCS) values according to the values of the CINRs corresponding to the pre-coding matrixes, calculating spectral efficiency corresponding to the MCS values, and selecting the pre-coding matrix with the highest spectral efficiency. When the method is applied to the closed loop multiple input multiple output system, channel quality can be improved, the throughput of a closed loop multiplexing system can be improved, and the gain can be increased.