203results about How to "Improve Spectrum Utilization Efficiency" patented technology

The invention discloses a method and a device for D2D (door-to-door) terminal communication. The method comprises the following steps that: a first user device obtains information related with a distance, wherein the distance is a distance between the first user device and a second user device; the first user device reports the information related with the distance to a base station; the first user device or the second user device sends a first device-to-device caching state report to the base station, wherein the first device-to-device caching state report comprises a caching state report of the first user device and / or a caching state report of the second user device; and the first user device receives the first device-to-device caching state report responding to the base station, distributes the resources and transmitting powers used by device-to-device communication between the first user device and the second user device according to the information related with the distance, and performs the device-to-device communication based on the distributed resources and the distributed transmitting powers used by the device-to-device communication between the first user device and the second user device.

The invention discloses an interference suppression method of a hybrid network of macrocell and Femtocell. The method comprises the following steps: the Femtocell in a certain range is clustered; the transmission power of the femto base station in the cluster; the clustering situation of the Femtocell is adjusted; the Femtocell in an interference sensitive area is clustered; for the Femtocell of the clustered interference sensitive area, the transmission power of the femto base station in the cluster is controlled by using the cluster as unit; the clustering situation of the Femtocell in the interference sensitive area is adjusted, the Femtocell cluster in the interference sensitive area is determined; the micro user equipment is divided into a dead zone user equipment and a non-dead zoneuser equipment; spectrum resources are divided into three nonoverlapping parts; and the spectrum resources are distributed for the Femtocell in the interference sensitive area, the dead zone user equipment, the Femtocell in the non-interference sensitive area and the non-dead zone user equipment. By adopting the method of the invention, the spectrum utilization efficiency and system capacity of the overlapped double-layer network of the macrocell and the Femtocell, and the problems of the cross-layer interference between the macrocell and the Femtocell and the same-layer interference of the Femtocell can be effectively solved.

As no single wireless standard can provide both broadband high-speed and seamless mobility for commercial wireless communications in terms of technology, cost, spectrum and performance, a new wireless convergence platform based on Open Wireless Architecture (OWA) has been disclosed, wherein the OWA-based TDD-OFDM is utilized as the principal air interface to provide cost-effective and spectrum-efficient broadband high-speed wireless transmissions, and converges with the second air interface, such as TDD-SCDMA or TDD-WCDMA based on OWA convergence platform to provide seamless mobile communications in order to support the future service-oriented wireless multimedia mobility infrastructure.

A method for adopting network code communication in wireless relaying network, improves the relaying ascending transmission efficiency by setting up relaying nodes and using network coding technique. The method includes the following steps: 1) disposing relaying nodes with network coding function in cellular districts, in order to extend signal coverage and be suitable for adopting network coding; 2) a base station self-adaptively determining whether to adopt relay whether to process using network coding to terminals at the relay point; 3) according to the base station feedback information, relay nodes performing data stream processing based on the network coding technique; 4) the base station centralizedly controlling the switch updating processing of network coding: when terminals move in different service districts, the base station updates relay nodes or service districts, amd newly execute network coding processing at novel relay points. The invention adopts network coding operations at relay nodes, so that the invention can respectively perform coding forwarding to the received different routing information, and largely improves relay transmission efficiency and transmission performance of edge users.

Systems and methods of transmitting a multi-user (MU) wake-up packet in WLAN including wake-up signals to activate main radios on multiple communication devices via the wake-up radios (WURs). In the multi-user wake-up packet, a frequency channel can be divided into several sub-channels for transmitting multiple wake-up signals in FDMA. Each wake-up signal is modulated in ON / OFF Key modulation. Two adjacent wake-up signals are adequately spaced apart by a certain frequency spacing to reduce adjacent channel interferences. Once a WUR on a receive device receives the packet, it generates a wake-up indication to wake up the main radio for active data communication. The MU wake-up packet may also include a sequence of multiple wake-up signals transmitted using the same sub-channel and cascaded in a time-domain. A reconfiguration window may be inserted between consecutive wake-up signals on the same sub-channel, and between a legacy preamble and the following wakeup signals.

The invention relates to a wideband and narrowband integrated multi-connection trunking system and a distribution method of transmission channels of the same and belongs to the technical field of wireless communication. The wideband and narrowband integrated multi-connection trunking system includes a TD-LTE-based broadband trunking base station, a PDT narrowband trunking base station and n digital trunking user terminals. The digital trunking user terminals are provided with wideband receiving interfaces and narrowband receiving interfaces; the wideband receiving interface and the narrowband receiving interface of each digital trunking user terminal are connected with the TD-LTE-based broadband trunking base station and the PDT narrowband trunking base station simultaneously through a wideband digital trunking channel and a narrowband digital trunking channel respectively. The distribution method of the transmission channels of the wideband and narrowband integrated multi-connection trunking system includes that when a calling user terminal sends a calling building request to the PDT narrowband trunking base station, the PDT narrowband trunking base station and the TD-LTE-based broadband trunking base station are interlinked in a wired mode and together conduct physical layer resource distribution. The distribution method can improve the frequency spectrum use ratio in digital trunking communication, improve service experience of trunking users and achieve wideband and narrowband integration of digital trunking communication.

The invention provides a channel detection method, a channel detection device, and a terminal of an LTE system working in an unauthorized frequency band. The channel detection method of the LTE system working in the unauthorized frequency band is characterized in that indication information transmitted by a base station can be received; upstream channel detection can be carried out in the unauthorized frequency band; when the upstream channel is detected to be in the idle state, the upstream data can be transmitted. By adopting the technical scheme, the reasonable channel detection process of the terminal can be carried out, and under the precondition of improving the utilization rate of the frequency spectrum, the coexistence with other systems in the unauthorized frequency band can be realized, and at the same time, the fairness of the channel competition in the unauthorized frequency band can be guaranteed.

The invention provides a wireless local area network access method, an access point and a terminal. The method is characterized in that a notification message sent by AP on a channel of a first frequency band carries channel information of the first frequency band and also carries channel information of a second frequency range which expects the terminal to preferentially access so that the terminal can rapidly acquire and maintain channel information of the plurality of frequency bands; and then when the AP is subsequently accessed, according to a predetermined strategy, in the channel information of the plurality of maintained frequency bands, the frequency band of priority access is directly selected to carry out access. High-efficient and rapid frequency spectrum navigation is realized, several times of repeated overtime processes or disassociation operation in the prior art are avoided, frequency spectrum navigation time and channel occupation are reduced and a user experience is improved.

The present invention relates to an inline interference suppression based geostationary orbit (GEO) and non-geostationary orbit (NGEO) communication satellite spectrum sharing method. In the method, interference analysis is performed on GEO and NGEO satellite communication systems using the same frequency band, so as to determine inline interference constraints of the communication satellite systems in a downlink sharing frequency scene and an uplink sharing frequency scene; mathematical models of the GEO and NGEO satellites in the downlink sharing frequency scene and the uplink sharing frequency scene are established according to a power control method; and a carrier to noise ratio of an NGEO ground station and total interference of the NGEO satellite to a GEO ground station in the downlink sharing frequency scene and the uplink sharing frequency scene are calculated, and a transmitting power range of the NGEO satellite is obtained. Through adoption of the method, the spectrum use efficiency of the two satellite systems is improved, and the problem that the satellite systems cannot work simultaneously due to inline interference is solved.

The invention relates to a method for carrying out grouping cooperative communication on multiple users based on network encoding technology, which means that grouping is carried out on the multiple users in a special grouping way in a cellular relay network; then, each group of user data is encoded and transmitted by a relay node through the network encoding technology, so that the relay transmission efficiency is improved, and the problem of low relay upstream transmission efficiency can be solved; and when the user is positioned at the edge of a subdistrict, the method can improve the transmission performance, and the coverage range of a base station in the whole subdistrict is enlarged. The method comprises the operation steps of: setting the functions of the relay node in an initialized way, channel estimation and base station selection, judgment of a cooperative partner, grouping transmission executed by the user and self-adaptive centralized control executed by the base station. The method fully utilizes the channel characteristics of cellular cell users, and can be used for grouping the multiple users, thus practically improving the relay transmission efficiency and the transmission performance of the edge user, and reducing the outage probability of the system.

The invention relates to the technical field of mobile communication, in particular to data sending technology for a multi-input multi-output (MIMO) system and corresponding data receiving technology. The embodiment of the invention provides a data sending method, a corresponding data receiving method, a corresponding data receiving device and corresponding data receiving equipment for the MIMO system, and is used for increasing the signal-to-interference-plus-noise ratio of received signals of the MIMO system and improving the performance of the system. The data sending method for the MIMO system comprises the following steps: at least two groups of data of the same user are subjected to channel coding and interweaving respectively, and interweaving patterns adopted when the data are interwoven are not same; two data sequences obtained after the interweaving are modulated respectively and then are sent, and interweaving pattern indication information adopted when the data are interwoven is sent.

The invention discloses a method for simultaneous communication between DMR (digital mobile radio) / PDT (portable data terminal) devices in double time slots. The method mainly aims to overcome the shortcoming that another idle time slot cannot be effectively utilized for transmitting voice or data information and control instructions while a time slot is utilized for transmitting voice in a current communication terminal or system in DMR / PDT private network or general communication, the advantage of double time slots of a DMR / PDT system is sufficiently utilized, and purposes of voice duplex and simultaneous transmission of industrial data or control signaling and voice business in the double time slots are achieved. The method has the advantages that functions of voice duplex, data and voice synchronous transmission and the like can be effectively realized, application functions of the DMR / PDT communication system are enriched, and the utilization rate of frequency spectrum resources is effectively increased.

The invention discloses a method and a system for realizing large-bandwidth carrier idle state detection. In both the method and the system, a transmitting site and a plurality of receiving sites perform the carrier channel idle state detection to respectively determine the channel bandwidth and the time occupied by performing one or more data packets interaction by the transmitting site and each receiving site, a transmission opportunity in a large-bandwidth system is fully used, the precondition for different receiving sites to respectively perform channel reservation with the transmitting site in one transmission opportunity is ensured, and the frequency spectrum utilization efficiency in the large-bandwidth system is improved.

The invention provides a frequency layout method based on cooperating with multi-point single user multi-input and multi-output which includes steps as follows: averaging a frequency segment occupied by the subdistrict by using CoMP transmitting into three equal parts: three sectors occupy one third of the subdistrict frequency segment orderly; then dividing each sector frequence band into a CoMPSector Zone frequency band for providing service to CoMP user, and residual frequency band services the non-CoMP user by a method of using a frequency reuse factor; selecting CoMP mode participated by a virtual subdistrict according with a user transmitting ratio requirement, then distributing CoMP sector Zone frequency band size according with the transmitting requirement ratio of CoMP user and non-CoMP user, finally deciding whether adjusting or transfering to CoMP Sector Zone frequency band size or CoMP mode real time according with the measurement and feedback of the user chunnel quality. The method can reduce calculating complex degree and information alternation amount to the network carried by CoMP, ensure frequency spectrum of the whole edge user and the whole system, and increase system chunnel capacity.

The invention discloses a method for combining dynamic access and subcarrier allocation under a cache-based ultra-dense network. The method comprises the following specific steps that firstly, multiple users simultaneously send request information to all access points to search a caching content; secondly, each access point judges whether a caching content requested by the current user K exists, all access points meeting the user K transmit respective property parameters to local control, and the local control allocates the optimal access point to the user K, otherwise the user K directly sends a request to a remote server to obtain the content; thirdly, the remote server utilizes popularity analysis to complete cache updating according to the user request information; and lastly, after each user is matched with the respective access point, subcarrier allocation is carried out, so that each user is communicated with the respective access point. The method has the following advantages that multiple factors are synthesized to complete access selection, and promotion of the resource management efficiency and dynamic allocation of the subcarrier are realized, so that the spectral efficiency is remarkably improved.

The method distributes time section for data uplink emitting and downlink emitting within a time frame first; and distributes synchronous time slots for realizing uplink synchronization and downlink synchronization, control time slots for transmitting uplink signaling and downlink signaling, common pilot frequency time slot for channel estimation and service time slot for transmitting high speed data within the abovesaid time section; then data emitting equipment in common pilot frquency time slot and service time slot will transmit pilot frequency signal and high speed service data of the user separately and finally data receiving equipment will carry on receiving of channel estimation and high speed service data according to the distributed common pilot frequency time slot and the distributed service time slot.

The invention discloses a cognitive radio system-based spectrum allocation method and equipment. The method comprises: a spectrum scheduling unit respectively receives spectrum resource application messages from a plurality of cognitive radio systems, wherein the spectrum resource application messages carry service priority levels corresponding to cognitive radio systems; the spectrum scheduling unit utilizes the service priority levels corresponding to all the cognitive radio systems and available white-space spectrum resources to allocate spectrum resources for all the cognitive radio systems; and the spectrum scheduling unit informs the corresponding cognitive radio systems of information of the distributed spectrum resources. According to the embodiment of the invention, on the basis of the system demand and consideration of the equity principle, the white-space spectrum resources are distributed to the multiple cognitive radio systems, thereby maximizing the utilization efficiency of the white-space spectrums, improving the using efficiency of the spectrums, and ensuring service transmission of the system having the higher priority.

The invention discloses a reconfigurable wireless node, which comprises a first communication device, a second communication device and a coaxial cable providing an analogue channel and a digital channel for communication between the first and second communication devices, wherein the analogue channel is used for transmitting a radio frequency signal in a radio frequency repeating way from a receiving antenna of the first communication device to a transmission antenna of the second communication device, or transmitting the radio frequency signal in the radio frequency repeating way from a receiving antenna of the second communication device to a transmission antenna of the first communication device; and the digital channel is used for transmitting data and control information from the first communication device to the second communication device or from the second communication device to the first communication device. The invention also discloses a method for cooperative work between the reconfigurable wireless node and a wireless access point of a macro cell. By the reconfigurable wireless node and the method, the categories of hardware platforms are reduced, the production and maintenance cost of the product is decreased, and the interference of the wireless node of a micro cell in the macro cell can be avoided.

The present invention discloses a data transmission method, a base station, and a communication system, which are applied in the communication field. The method includes: determining to perform semi-persistent scheduling on data of a user equipment; setting a value of first information for the user equipment, so that the user equipment determines a cyclic shift value of a reference signal sequence of the user equipment according to the value of the first information; and obtaining the reference signal sequence of the user equipment, performing channel estimation according to the reference signal sequence of the user equipment, and performing demodulation on data information of the user equipment according to a channel coefficient obtained by performing the channel estimation.

The invention discloses an MIMO-EDM wireless communication system and method. The MIMO-EDM wireless communication system comprises a hybrid system and a separation system. Multiple-input multiple-output technology and MIMO technology are combined, and multiple paths of signals can be separated from entropy domains by using an entropy division multiplexing algorithm. The MIMO-EDM wireless communication method comprises the following processes: transmitting n paths of source signals; receiving the aliasing signals through a receiving end; and separating the multiple paths of aliasing signals through the separation system. According to the MIMO-EDM wireless communication system and method, the utilization rate of spectrum resources and the capacity of wireless channels are improved; negentropy is used as the criterion of statistical independence, and the separation of the multiple paths of aliasing signals is realized in the information entropy domains for the first time; and high-speed and high- quality broadband wireless communication is realized.

The invention discloses a PTS method for lowering PAPR of an MIMO-OFDM system. Sub-block segmentation is carried out after information source bits are subjected to baseband modulation and series-parallel-connection conversion, time domain sub-block signals are obtained through IFFT modulation, all the time domain sub-block signals are subjected to time domain circulation shift of different lengths and then subjected to sub-block synthesis, and time alternative signals with different PAPRs are obtained. Meanwhile, after corresponding sub-blocks among antennas are switched, time domain circulation shift and sub-block synthesis are carried out to generate more time domain alternative signals, and then a sequence with the minimum PAPR is selected and emitted. Phase change is achieved through different lengths of circulation shift of the sub-blocks, more alternative sequences are obtained through sub-block switch among the antennas, more alternative sequence sets can be obtained under the condition of the same IFFT modulation amount, good PAPR inhibition performance is achieved, and blind detection of received signals is achieved by comparing the distance between a reverse rotary signal and a signal constellation point.

The invention relates to an ultra low loss optical fiber replacement scheduling method and system in a backbone network for improving the spectrum utilization efficiency of an operator. The method provided by the invention comprises the following steps: S1 calculating gains after the replacement of optical fiber links, that is, calculating remaining times of reduced frequency slot FS after the replacement of the optical fiber links to complete replacement of the rest optical fiber links; S2, selecting the optical fiber link with the highest gain after the replacement of one optical fiber linkfor replacement; and repeating S1 to S2 until all optical fiber links needing to be replaced are completely replaced. According to the ultra low loss optical fiber replacement scheduling method and system, by determining the most reasonable optical fiber replacement sequence, the spectrum resources are saved for the operators as much as possible for additional service use.

Provided are methods and devices for determining or acquiring radio resources. The method for determining radio resources includes that: predefined information is acquired, wherein the predefined information includes indication information of a dedicated node, and / or, measured values of Component Carriers (CCs) on a multisystem shared spectrum, wherein the indication information includes: information of the maximum number of CCs, which are available to a system, on the multisystem shared spectrum, and the measured values are acquired according to preset signals on the CCs; and the maximum number of CCs, which are available to a system, on the multisystem shared spectrum is determined according to the predefined information. By the technical solution, the problem of interference between systems may be solved, and spectrum utilization efficiency is improved.

The invention discloses a W waveband broadband millimeter wave full duplex access method and system based on local oscillation broadcasting. In a central station, N downlink data generation modules generate N SSB signals, a sharing local oscillation generation module generates W waveband light local oscillations, and wavelength division multiplexing is carried out on the N SSB signals and the light local oscillations, and the N SSB signals and the light local oscillations are transmitted to far-end nodes. After demultiplexing is carried out on the far-end nodes, each path of signals are regrouped into a light local oscillation and an SSB signal, and local oscillation broadcasting is achieved. Nonlinear interaction is carried out various paths of signals trough SOAs to generate multi-idler-frequency-light, carrier waves in the SSB signals and certain idler frequency light carrying signals with frequency space within a range of 75-110GHz with the SSB signals are coupled to be transmitted to a base station, beat frequency is carried out, and W waveband radio frequency electrical signals are generated. In the base station, a part of carrier waves in down links are extracted through fiber bragg gratings to serve as carrier waves of uplink signals. Wavelength division multiplexing is carried out on the uplink signals after modulation on the far-end nodes, the uplink signals are transmitted to the central station, and a full duplex RoF link is completed.

The invention discloses a three-dimensional space bee colony networking architecture construction method based on a heterogeneous cellular network, wherein the architecture is oriented to the heterogeneous and heterogeneous characteristics of medium and large unmanned aerial vehicles and small unmanned aerial vehicles. The method supports unmanned aerial vehicle group dynamic networking of a double-layer architecture in which medium and large unmanned aerial vehicles construct an upper-layer macro cellular network and small unmanned aerial vehicles construct a lower-layer micro cellular network. The construction process comprises the steps of micro-cellular initial networking, macro-cellular network establishment and network topology maintenance. The method also supports macro-micro cellular two-level cooperative spectrum sensing and distribution resource management and an efficient information sharing processing mechanism, improves timeliness of accurate identification and efficient sharing of the bee colony spectrum, and highlights efficient utilization of limited resources and flexible construction of the network. The method focuses on improving the spectrum utilization efficiency of the bee colony network and the energy efficiency of the unmanned aerial vehicle, and can realize rapid networking and dynamic topology management of large-scale unmanned aerial vehicle swarms and dynamic management and efficient utilization of wireless resources. In addition, the scheme can improve the efficiency of the unmanned bee colony, and copes with a complex and changeable networking environment.

The apparatus is composed of the narrow beam antenna of different direction and predetermined number, between the narrow beam antenna of same direction, the polarization diversity is achieved to supply the antenna system of multiple beam. In addition, the signal processing method is supplied to execute the balanced receiving on up-run multi-beam signal. The invention enlarges the coverage area, improves the system capacity and the efficiency of utilization.

The invention belongs to the technical field of wireless communication, and particularly relates to an active intelligent reflection surface auxiliary communication system. According to the invention,an active intelligent reflection surface is introduced into the design of a wireless communication system to assist original signal transmission, so that the spectral efficiency and the energy efficiency of the wireless communication system are further improved. Specifically, in the active intelligent reflection surface, each independent reflection unit can utilize an active circuit to realize anegative impedance characteristic, phase adjustment is performed on an incident signal to enable multiple paths of reflection signals to be mutually enhanced or offset at a receiver, and meanwhile, amplitude amplification is performed on the incident signal to enable a signal transmission distance to be enhanced. In order to achieve the purpose, the reflection coefficient of a reflection unit of the active intelligent reflection surface needs to be optimized, and meanwhile a receiver needs to optimize a receiving beam forming vector of the active intelligent reflection surface. The scheme of the method is simple to implement, it can be proved that the spectrum efficiency higher than that of allocating special communication resources to respective systems can be achieved, and the method hasvery high application value.

The invention belongs to the technical field of wireless communication, and particularly relates to a block selected mapping (SLM) method for reducing the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. According to the block SLM method for reducing the PAPR of the OFDM signal, a large number of alternative sequences can be obtained through a small amount of low-dimension IFFT (Inverse Fast Fourier Transform) operation based on an IFFT property, so that the complexity of a transmitting end is lowered. A low-complexity blind detection way is adopted at a receiving end, and the transmitting end does not need to transmit additional sideband information, so that the spectrum utilization efficiency is increased.

The invention discloses a method and a system for restraining interference between adjacent-channel coexisting systems, which are applied to two communication systems in different modes. The method includes: a first communication node in a first communication system is subjected to or possibly subjected to adjacent-channel interference from a second communication node in a second communication system; and the first communication system and the second communication system cooperate for adjustment to control the adjacent-channel interference on the first communication node. The system comprises the first communication node in the first communication system and cooperative adjusting devices in the first communication system and the second communication system, wherein the first communication node is used for determining the adjacent-channel interference or possible adjacent-channel interference from the second communication node in the second communication system, and the cooperative adjusting devices are used for realizing cooperative adjustment between the first communication system and the second communication system to control the adjacent-channel interference on the first communication node. Using the method and the system can improve service quality of the system and frequency spectrum utilization rate and evidently improve adaptability of wireless communication systems to practical environment.