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1114results about How to "Guaranteed communication quality" patented technology

Central air conditioner intelligent control system based on wireless sensor network and method

The invention discloses a central air conditioner intelligent control system based on a wireless sensor network and a method, and belongs to the technical field of central air conditioner control. The central air conditioner intelligent control system comprises an intelligent information management center, wireless communication devices, a central air conditioner information monitoring and control module, a room information monitoring and control module and the like. The invention adopts the method that the central air conditioner intelligent control system is used to monitor information, build a data base, calculate current load of the system, and realize advance, accurate and optimized control of a central air conditioner system by combining a short-term loading forecasting method based on similar dates and fuzzy control technology, as well as taking the temperature variation of supply/return chilled/cooling water of a central air conditioner as the manipulated variable. The central air conditioner intelligent control system has the characteristics of great communication capacity, guaranteed communication quality, powerful network functions, wide monitoring range and extensive control quantity of the central air conditioner system, optimized control, high control accuracy, good energy saving effect and the like, and can be widely used in energy-saving optimizing control of various buildings, and is particularly suitable for energy-saving optimizing control of central air conditioners of intelligent buildings.
Owner:CHONGQING UNIV

A D2D resource allocation method based on multi-agent deep reinforcement learning

The invention discloses a D2D resource allocation method based on multi-agent deep reinforcement learning, and belongs to the field of wireless communication. The method comprises the following steps:firstly, constructing a heterogeneous network model of a cellular network and D2D communication shared spectrum; establishing a signal to interference plus noise ratio (SINR) of a D2D receiving userand an SINR of a cellular user based on the existing interference, respectively calculating unit bandwidth communication rates of a cellular link and a D2D link, and constructing a D2D resource allocation optimization model in a heterogeneous network by taking the maximum system capacity as an optimization target; For the time slot t, constructing a deep reinforcement learning model of each D2D communication pair on the basis of the D2D resource allocation optimization model; And respectively extracting respective state feature vectors from each D2D communication pair in the subsequent time slot, and inputting the state feature vectors into the trained deep reinforcement learning model to obtain a resource allocation scheme of each D2D communication pair. According to the invention, spectrum allocation and transmission power are optimized, the system capacity is maximized, and a low-complexity resource allocation algorithm is provided.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Pilot frequency information and satellite ephemeris joint Doppler frequency shift estimation and compensation method

The invention provides a pilot frequency information and satellite ephemeris joint Doppler frequency shift estimation and compensation method which includes the steps: a receiving pilot frequency signals from a low-orbit satellite by a ground terminal k; b acquiring satellite ephemeris data of the latest time tk, the frequency and the phase of carrier waves and the frequency and the phase of pseudo codes based on the pilot frequency signals by the ground terminal k; c calculating Doppler frequency shift between the ground terminal k and the low-orbit satellite based on satellite ephemeris information of the pilot frequency signals corresponding to the latest time tk, the frequency and the phase of the carrier waves and the frequency and the phase of the pseudo codes; d adjusting the frequency of the pseudo codes and the frequency of the carrier waves based on the Doppler frequency shift, and performing Doppler compensation when uplink signals are transmitted. The Doppler frequency shift is estimated and compensated by a high-precision pilot frequency method with small calculated amount, and the Doppler frequency shift is preferentially estimated and compensated by a high-precision orbit ephemeris method when the terminal suddenly cannot receive the pilot frequency signals due to reasons such as blocking of tall buildings.
Owner:上海欧科微航天科技有限公司

Multi-frequency carrier aggregation WIFI data transmission method and device, and terminal equipment

The invention relates to a multi-frequency carrier aggregation WIFI data transmission method and device and a terminal device. The multi-frequency carrier aggregation WIFI data transmission method comprises the following steps: when the WIFI networks covering the terminal contain a plurality of signal frequency bands, controlling the WIFI channel operating in the frequency bands in the terminal enter into the enabled state at the same time; establishing a communication link with each one of the signal frequency bands mentioned above; using the established communication links to transmit the data together. Thus, the transmission bandwidth is widened, and the data transmission rate is improved without increasing the antenna; meanwhile, according to the embodiment of the invention, the weight ratio of the first information flow of each communication link is calculated according to the signal transmission rate of each communication link; and the WIFI data to be transmitted is allocated to each communication link according to the first information flow weight ratio of each communication link; therefore, the information flow weight of each signal frequency band can be flexibly configured, the information capacity is maximized while ensuring the communication quality, and the spectrum resources can be better used.
Owner:QINGDAO HISENSE MOBILE COMM TECH CO LTD

Networking work mode selection method and device and terminal

The invention provides a networking work mode selection method and device and a terminal. The networking work mode selection method comprises the steps that the preset work mode parameter informationis acquired; networking work mode ordering information is obtained according to the preset work mode parameter information and the networking work mode information; and the networking work mode ordering information is transmitted to a base station, wherein the preset work mode parameter information includes the work mode preference setting information for the terminal and the power supply state information. According to the scheme, the networking work mode ordering information is obtained according to the preset work mode parameter information and the networking work mode information and the networking work mode ordering information is transmitted to the base station so that the base station is enabled to determine the matched networking work mode to dispatch the terminal from the networking work mode ordering information reported by the terminal according to the capacity information of the base station. The problems in the prior art that the terminal simultaneously supporting the 5G independent networking and non-independent networking mode cannot select the networking work mode can be greatly solved.
Owner:CHINA MOBILE COMM LTD RES INST +1

5G mobile edge computing-based task unloading and resource allocation joint optimization method

The invention relates to a 5G mobile edge computing-based task unloading and resource allocation joint optimization method, and belongs to the technical field of mobile communication. According to themethod, a task unloading decision, resource block distribution and computing resource distribution are jointly modeled into a minimum system overhead problem, and the minimum system overhead problemis decomposed into three sub-optimization problems to be solved. The method comprises the following steps of firstly, considering that UE delay sensitivity in an actual network is different, proposinga distributed resource block distribution algorithm based on the UE delay priority, dividing the UE into UE blocks with different priorities according to the UE delay sensitivity, preferentially allocating the resource blocks for the UE with high priorities, and meanwhile, ensuring the communication quality of the UE with low priority; secondly, enabling each piece of UE to make an unloading decision according to the task local computing overhead and the task unloading computing overhead; and finally, with the goal of minimizing the total execution time of the total unloading task in the MECas a target, allocating the computing resources to the UE.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Quantum key distribution system and method based on time-slot mixed active polarization compensation

The invention discloses a quantum key distribution system and method based on time-slot mixed active polarization compensation. The quantum key distribution system comprises a transmitting terminal, an optical signal generation module, a polarization modulator, a synchronous signal generator, a wavelength division multiplexing module, a wavelength division multiplexing solution module, a synchronous signal receiver, a polarization demodulator, a signal detection module and a receiving terminal. According to the quantum key distribution system and method, adopted reference light pulse signals and quantum pulse signals have the same wavelength, the magnitude of single pulse energy of the reference light pulse signals is far larger than the magnitude of single pulse energy of the quantum pulse signals, and the magnitude can be detected through a photoelectric detector. The reference light pulses do not need to be accumulated repeatedly to calculate sums when the detection is carried out, and the polarization compensation rate can be greatly promoted. After the active polarization compensation, and different polarization codes are detected based on a unified polarization detection device, so the quantity of SPAD can be reduced. An optical switch is utilized to carry out switchover on a detection light path, the phenomenon that the strong reference light pulse signals directly impact the SPAD, and therefore communication quality of quantum signals can be guaranteed.
Owner:东莞先进光纤应用技术研究院有限公司 +1

Joint power control and proportional fair scheduling method for D2D communication in cellular network

InactiveCN106231620AImprove fairnessGuaranteed minimum signal-to-noise ratio requirementsPower managementNetwork traffic/resource managementFair schedulingNetwork model
The invention discloses a joint power control and proportional fair scheduling method for D2D communication in a cellular network, relates to the field of D2D communication in the cellular network, and aims to solve the problem of common-channel interference between users and the problem of fairness between the users due to the fact that the maximum throughput capacity of a system is used as a target in the existing interference suppression algorithm. An optimal power control method is used for realizing interference suppression. Meanwhile, aiming at the problem of user fairness caused by the time-varying characteristic of a channel under the condition of coexistence of multiple users, the invention adopts the proportional fair scheduling method so as to meet the demand of the users for the fairness. A cellular network model for multiplexing uplink resources for D2D communication is constructed, and mathematical modeling and solving for joint power control and proportional fair scheduling are carried out for the network model. The interference suppression method for joint power control and proportional fair scheduling, which is provided by the invention, can guarantee the quality of user communication and improve the throughput capacity and the fairness of the system.
Owner:HARBIN INST OF TECH

Multi-cell interference suppression method between cell and end-to-end hybrid network

The invention discloses a multi-cell interference suppression method between a cell and an end-to-end hybrid network in the technical field of mobile communication. Communication interference is produced by a cell user, the ID (Identity) of an interfered end-to-end user is decoded by the cell user through monitored public control channel information monitored, and the information is reported to a central controller; information exchange is carried between the central controller and a central controller of an adjacent cell, and the exchanged information is transmitted by the central controller of the adjacent cell to the interfered end-to-end user in the local cell; frequency information capable of being multiplexed is obtained when uplink resource distribution information detected by the cell user of the local cell is received by the interfered end-to-end user, and the multiplexing frequency is adopted for end-to-end communication; and the communication priority of the cell user producing the communication interference is higher, and the interfered end-to-end user controls the transmission power to resist against interference caused by the cell user producing the communication interference. The quality of the communication of end-to-end users can be improved.
Owner:BEIJING JIAOTONG UNIV

Antenna system and control method for antenna system

The invention relates to an antenna system and a control method for the antenna system. The antenna system comprises a control module, a master set high-frequency antenna, a master set medium and low-frequency antenna, a diversity high, medium and low-frequency antenna, a master set high-frequency antenna switch module, a master set medium and low-frequency antenna switch module, a diversity medium and low-frequency antenna switch module and an antenna selector switch, wherein the master set high-frequency antenna is connected with the master set high-frequency antenna switch module; the master set medium and low-frequency antenna and the diversity high, medium and low-frequency antenna are connected with the master set medium and low-frequency antenna switch module and the diversity medium and low-frequency antenna switch module through the antenna selector switch; the control module is configured to judge a frequency band in which a current network signal is located; and when the current network signal is in a high-frequency band, the antenna selector switch is controlled to be in an unswitched state. On one hand, the antenna system is relatively simple and compact in structure, and does not affect the use experience of a user; and on the other hand, the problem that the signal which is received and transmitted through the master set high-frequency antenna is affected by the signal which is received and transmitted through the diversity high, medium and low-frequency antenna in the high-frequency band is solved.
Owner:XIAOMI INC
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