126results about How to "Good channel quality" patented technology

A method and system for optimizing channel quality indicator (CQI) transmissions by mobile devices in a cellular network allows transmission of CQIs at a slower rate and with fewer bits during voice-over-internet-protocol (VoIP) sessions than during non-real-time (NRT) data transmissions. A VoIP transmission typically includes “talkspurt” periods, during which VoIP packets are transmitted, and silence periods, which start with a silence indication (SID) packet and continue with periodic SID packets until a VoIP packet is received. When the base station is transmitting NRT data, the mobile device transmits CQIs to the base station at a first rate, with each CQI having a first fixed number of bits. When the base station is transmitting VoIP to the mobile device, then during a talkspurt period, the mobile device may transmit CQIs to the base station at a second rate slower than the first rate, and each CQI may have a second fixed number of bits less than the first fixed number of bits. However, during a silence period, the mobile device does not transmit CQIs to the base station, and uplink channel resources allocated for the CQIs can be reallocated to other mobile devices.

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.

Different frequency reuse values are associated with different channels, e.g., different types of channels in a cellular communications system. For a high speed downlink shared type of channel, the frequency reuse may be greater than one in order to achieve higher data rates. On the other hand, the frequency reuse may be set to one for other channel types, e.g., dedicated channels including both uplink and downlink dedicated channels. Alternatively, the frequency reuse may also be set greater than one for channels in addition to the downlink shared channel, e.g., one or more dedicated downlink channels, while a frequency reuse of one is deployed for one or more uplink dedicated channels. Using different frequency reuse values reduces inter-cell interference, particularly at cell borders, while still maintaining existing soft handover schemes for dedicated channels if one or more of the channels is a code division multiple access (CDMA) type of channel.

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 an ant algorithm-based distributed self-network dynamic-routing method, comprises the courses of route finding and route maintaining. The route finding course is completed by both forward ant packet and backward ant packet, where the forward ant packet takes charge of establishing a path back to the source node and the backward ant packet takes charge of establishing a path to the destination node; each middle node implements distributed treatment of jamming problem, chain breaking problem and shortcut problem in the data transmitting course in the route maintaining stage. The method can reduce added expenses and makes network loads trend to balance and reduces end-end delay time for packet transmission.

A channel quality feedback method for wireless transmission is described in which the rate for reporting channel quality information from a mobile station to a base station is variable as a function of the presence or absence of a transmission from the base station to the mobile station. In particular, the feedback rate from the mobile station to the base station is increased when the mobile station detects a transmission from the base station. As such, the feedback rate is slower when there is no data transmission for the mobile station and faster when the mobile station is receiving data.

The invention provides a self-adaptive setting method and device for a CRE bias. The method and device are used for setting the CRE bias in a switch from a macro cell to a cell of low power; S1: carrying out a statistics of a signal to interference and noise ratio (SINR) of boundary users in the cell of low power under the current CRE bias; S2: judging whether the SINR of all the boundary users of the cell of low power is larger than a preset threshold value SINRth, if yes, adopting the current CRE bias and ending the setting process, if no, executing the S3; and S3: subtracting an adjustment step length delta 2 from the current CRE bias value and then an updated current CRE bias is obtained, and then turning to the S1. The self-adaptive setting method and device for the CRE bias ensures expansion of equivalent coverage area of Pico Cells while trying to ensure channel quality for the boundary users to the greatest extent.

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.

A mobile communication system controls switching a transmission diversity system for each channel, and improves the quality of the channel. When the channel type in an uplink is a channel for transmitting voice, open loop transmission diversity is used (steps S1→S3). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S1→S2). Since the open loop transmission diversity or the closed loop transmission diversity whichever is more appropriate can be used, a transmission diversity system can be appropriately switched for each channel, thereby improving the quality of the channel.

The present invention relates to a method for communicating in a network, said network comprising a primary station and at least a first secondary station, wherein the first secondary station transmits to the primary station an indication of a first plurality of precoding vectors, wherein the number of first precoding vectors is greater than a preferred rank of transmission from the primary station to the first secondary station.

The invention provides an inter-station interference coordinating and a pre-coding scheme for a downlink multi-antenna OFDMA system, which aims to solve the problems of the existing dynamic coordinating and pre-coding scheme. In the scheme, special compatible time frequency resources with identical numbers are configured in advance for each community in a network, and the compatible time frequency resources configured for each community in the network are different from the compatible time frequency resources for each community in an interference coordinating community cluster. During coordination, if the current resources are identical to the compatible time frequency resources configured for the community, the coordinating and pre-coding message is transmitted to the community in the interference coordinating community cluster according to feedback channel information from edge user terminals of the community; and if the current resources are identical to the compatible time frequency resources configured for the coordinating community registered by the community, the coordinating and pre-coding message transmitted by the coordinating community is received, and the coordination is implemented. Since the compatible time frequency resources are configured for each community, each community has the opportunity to improve the channel quality of the edge user terminals of the community, and reduce the inter-station interference.

The invention is applicable to the technical field of short wave communication networks, and provides a private network frequency-selecting networking chain building method based on a short wave channel. The method comprises the following steps: a stable and reliable time synchronization system is built and a standard synchronous clock is provided via satellite timing equipment; all users in a subnet shares a common frequency set, and after start-up, the users synchronously scan the frequency set under the control of the synchronous clock; when in communication, a source user computes next time slot resident frequency of a target user, and initiates a call on the frequency; and after communication business between the source user and the target user is completed by building a chain therebetween, the frequency is released for the other users. According to the method provided by the invention, depending on the time synchronization system formed by Beidou or GPS, the source user computes the next time slot resident frequency of the target user, and then initiates the call on the frequency, so that frequency consistency between two communication parties is ensured, and channel quality is improved; waveform with a minimum format is used, so that utilization frequency is small, and time for building the short wave chain is short.

Characterizing channel response in a single upstream burst using redundant information from training tones (TTs). The invention is operable to utilize inserted TTs, contained within a transmitted data frame, to provide for an improved estimate of a communication channel's actual response and an improved estimate of the noise of the communication channel. The invention determines a maximum allowable delay spread of the many communication paths within a multi-path communication channel. Using the redundant TTs information, then a portion of the finite impulse response of the communication channel, within the time domain, may be zeroed, thereby providing a much improved channel estimate and noise estimate. Using the redundant TTs, less noise is introduced onto the data tones (DTs) within a data frame. The present invention is also able to identify those portions of the TTs that are attributable to the actual channel and those that are attributable to the channel's noise.

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 discloses a user equipment downlink transmitting power allocation method in a multi-user-multiple?input?and?multiple?output (MUMIMO) system. The method comprises the following steps that: A, in a system initialization phase, a mapping table of the modulation and coding mode of each order and transmission efficiency is set, in the mapping table, the modulation and coding mode of each order is uniquely corresponding to one transmission efficiency value; B, the modulation and coding mode of each set of user equipment in a community is obtained according to scheduling information; C, as for any set of user equipment in the community, the mapping table is queried according to the modulation and coding mode of the user equipment so as to obtain a corresponding transmission efficiency value, and the downlink transmitting power of the user equipment can be calculated according to the transmission efficiency value, wherein the transmitting power of the user equipment is a monotone increasing function of the transmission efficiency value; and D, corresponding transmitting power is allocated to each set of user equipment according to the calculation results of the downlink transmitting power, such that downlink data transmission can be performed. The invention also discloses a user equipment downlink transmitting power allocation device in the multi-user-multiple?input?and?multiple?output (MUMIMO) system.

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 a random channel access method of a narrow pulse ultra wide band network and based on business priorities. The control structure refers to the CDPD structure characteristic that uplink channel and downlink channel are included, in improving throughput capacity, measures of CSMA and time slot ALOHA for overcoming data packet collision are learned, and through defining the grades and the structures of control frames, nodes with different business priorities in the network obtain the right to use channels through acquiring different grades of control frames. According to the invention, channel resources in the narrow pulse ultra wide band network are reasonably utilized, the channel utilization rate of the network is increased, services can be provided according to grades before data packet collision, and a service grade safeguard mechanism which is different from a previous mechanism based on a back off algorithm is achieved. The random channel access method can be applied to occasions of narrow pulse ultra wide band radio networks, multi-hop mobile ad hoc networks, wireless local area networks and next generation heterogeneous networks and the like.

The invention provides a broadband switching method, a user terminal and network side equipment, and belongs to the technical field of wireless communication. The broadband switching method applied tothe network side equipment comprises the steps of configuring a measurement interval, and adopting the measurement interval for the network side equipment to carry out channel measurement on a non-activated bandwidth part (BWP). The broadband switching method applied to the user terminal comprises the following steps: receiving configuration information of a measurement interval sent by network side equipment through a first high-level signaling, wherein the measurement interval is used for the user terminal to send an uplink sounding reference signal SRS on an inactive BWP. Through the technical scheme of the invention, the BWP to be switched can be determined through channel quality measurement.

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 present invention provides a channel quality reporting method used for a communication system including a channel quality indicator, including: detecting a first measurement reflecting a first communication quality of the communication system; providing a series of thresholds and mapping functions, each mapping functions in association with a bin defined by two adjacent thresholds, so the first measurement is mapped to the channel quality indicator by the mapping function in association with the bin which matches the first measurement; updating a second measurement used for reflecting a second communication quality of the communication system; and updating at least one of the thresholds according to the second measurement. The present invention also provides a channel quality reporting apparatus. The channel quality reporting method and apparatus provided by the present invention not only track the actual channel characteristics, but also obtain better channel quality.