267 results about "Time-Division Long-Term Evolution" patented technology

The invention discloses a terminal D2D (device-to-device) cooperation relay communication implementation method in a TD-LTE-A (time division-long term evolution-advanced) system, and relates to a relay communication implementation method in the TD-LTE-A system. The method disclosed by the invention aims at realizing communication coverage on terminals in the TD-LTE-A system under a 4G (4th generation) standard and improving service quality and system throughput. According to the method disclosed by the invention, an on-net idle user in a cell is used as a mobile relay, terminal D2D cooperation relay communication is established with a user on the edge of the cell, relay service is provided for the user on the edge of the cell, the coverage range of the cell, the service quality of the user on the edge and the system throughput are significantly improved by resource allocation and time slot allocation of the cell, and the network construction cost of the system can be further greatly reduced. The method disclosed by the invention is suitable for the TD-LTE-A system.

The invention provides an alternating current charging pile system on the basis of a TD-LTE (time division long term evolution) network. Application of the TE-LTE network is combined. A charging pile substation serves as a site management center of alternating current charging piles, an analysis result on fault diagnosis of the site charging piles is provided via an embedded WEB server, aerial update service is provided for site charging pile firmware, load for an alternating current charging pile group is controlled and scheduled, remote fault diagnosing and monitoring and program updating service are realized, maintaining efficiency is improved, orderly charging is guaranteed by load controlling and scheduling, normal power supplying is reduced, charging quality for users is guaranteed, and stability of a power grid is maintained.

The invention discloses a method for realizing trunking traffic and a trunking user terminal. The method is realized in a digital trunking communication system based on a time division long term evolution (TD-LTE) technique. In the digital trunking communication system based on the TD-LTE technique, a logical channel and a transmission channel which are used for realizing the trunking traffic arenewly added, wherein the logical channel is a trunking paging control channel (TPCCH) and a trunking traffic channel (TTCH), the transmission channel is a trunking paging transmission channel (TPCH),and identifications and mapping approaches which are used for distinguishing the logical channel from the other logical channels are respectively defined for the TPCCH and the TTCH. Through the TPCCH, paging and control messages, such as the call setup, the call release, the discourse right notice and the like of the trunking traffic, are loaded. Through the TTCH, the data messages of the trunking traffic are loaded. By applying the scheme of the invention, call setup time can be shortened, and resource utilization ratio can be increased.

The invention discloses a digital clustering communication system, in particular a digital clustering communication system based on a TE-LET technology, which is realized on the base of a time division-long term evolution technology and by expanding the functions of a certain network elements and adding new network elements of the prior TD-LTE technology. The invention also provides two clustering service implementation methods. The system and the methods not only can better provide broadband clustering multimedia services but also can backwards evolve smoothly.

The invention discloses a method for achieving a group calling business. The method is achieved based on a broadband digital trunking communication system which is achieved on the basis of a time division-long term evolution (TD-LTE) technology. As a TD-LTE system uses a full internet protocol (IP)-based and flattened network framework, a base station communicates with a core network directly, accordingly, the time delay of a control plane and a user plane is small, and calling setting time is shortened; and as the TD-LTE technology uses an advanced air interface technology, so that the transmission delay of a wireless network is reduced greatly; in addition, during the setting process of group callings, a signaling message parallel processing mode is used, that is resources are allocated to a calling terminal and a called terminal in parallel, a radio bearer, an S1 bearer and the like are built, and accordingly, the calling setting time is further shortened; and as the TD-LTE system is achieved in a packet domain, smooth backward evolution is facilitated.

The invention provides a TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for a relay system and relates to services or facilities suitable for a wireless communication network. The method comprises the following steps: obtaining positions of synchronizing signals and information about cell ID (Identity) number and cell group ID number inside a cell identification group from receiving signals at a relay end, so as to obtain a synchronizing signal sequence received by a relay; secondly, generating a local PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) according to the obtained relay-end cell ID number and cell group ID number relay end; thirdly, carrying out an integer-frequency-offset estimation process by using the PPS received at the relay end and the obtained relay locally-generated PSS; and finally, carrying out integer-frequency-offset adjustment on the receiving signals of the PSS / SSS at the relay end by using the obtained result epsilon I of the integer-frequency-offset estimation, and carrying out fine-frequency-offset estimation process by using a corresponding algorithm. Therefore, the problem of the frequency offset estimation at the relay end can be solved, and the sending frequencies of the signals received at the relay end and the signals at a base station end are synchronous.

The invention discloses a method for determining and regulating group calling region information. The method is applied to a broad band digital trunking communication system based on a time division long term evolution (TD-LTE) technology. The method comprises the following steps that: a group user starts up to execute an attachment process so as to report position information of the group user to an enhanced mobile management entity (eMME); the eMME transmits the received position information to an enhanced home subscriber server (eHSS); the eHSS stores the received position information and forms the group calling region information of the group by using the position information of all the group users belonging to the same group; and the eMME determines that the position information of the group user is changed and informs the eHSS of updating the stored group calling region information. By the method, the group users in various states can be guaranteed to be added into the group calling.

The invention provides a wideband digital cluster system based on TD-LTE (time division-long term evolution) and a data transmission method thereof. The system comprises one or more cluster application servers, an LTE core network and a wireless access sub-system, wherein the cluster application servers are used for scheduling a cluster business, scheduling and managing an end-to-end session of a user terminal, and sending the data from the user terminal to the LTE core network; the LTE core network is used for receiving the data, allocating an IP (Internet protocol) multicast address to the session according to the group identifier of a target terminal, sending the IP multicast address to the wireless access sub-system, and then sending the data to an evolved base station joining the IP multicast corresponding to the IP multicast address; and the wireless access sub-system comprises one or more evolved base stations which are used for joining the IP multicast corresponding to the IP multicast address according to the IP multicast address, receiving the data and sending the data to each target terminal in the target terminal group. Through the invention, the cluster business can be realized by expanding the existing LTE core network.

The invention discloses a method for resolving time synchronization and decimal frequency synchronization in a time division long-term evolution (TD-LTE) system by using weighted average and relates to the technical field of mobile communication. Aiming at the synchronization problem in the TD-LTE system in the prior art, the method comprises the following steps of: delaying an orthogonal frequency division multiplexing (OFDM) symbol sampling point for a baseband digital signal which is received at a receiving end, performing normalized autocorrelation in a time domain to generate a peak value, and obtaining a time synchronization point and decimal frequency offset; performing cross-correlation on the baseband digital signal and a locally generated primary synchronization signal (PSS) in the time domain, and obtaining higher-accuracy time synchronization point and decimal frequency offset according to a peak value which is generated trough the cross-correlation; and obtaining time-domain channel estimation through the PSS signal by using non-coherent detection, performing weighted average in time synchronization and decimal frequency synchronization which are obtained in a simplified maximum likelihood (ML) algorithm and the PSS respectively according to channel impulse response length so as to adapt to environmental change of the channel and effectively acquire stable-performance time-frequency synchronization. The invention provides a method for time synchronization and decimal frequency synchronization which adapt to channel environment.

The invention relates to a planning method of a multi-system intelligent configurable wireless network. The planning method comprises the following steps of: determining systems and requirements of wireless network planning by users, and configuring network planning parameters according to the systems and requirements; respectively carrying out rough network planning and fine network planning; and finishing planning results, and providing output data and charts for planning as a total result of the current network intelligent planning for providing reality basis and reference for users. The planning method disclosed by the invention is used for carrying out rough network planning and fine network planning on a set region by combining with an actual geographic information system on the basis of current situation of coexistence of multiple networks and supports single-network and multi-network simulation. Multiplex network systems supported by the method disclosed by the invention not only comprise a 2G (2-generation) network, a 3G (3-generation) network, a 3G (HSPA (High Speed Packet Access), EV-DO (Evolution-Data Optimized)) and 4G (TD-LTE (Time Division-Long Term Evolution), FDD-LTE (Frequency Division Duplexing-Long Term Evolution)), supports planning of multiple clustering systems (TETRA (Terrestrial Trunked Radio), iDEN (Integrated Digital Enhanced Network), GoTa (Global open Trunking Architecture) and GT800) and has complete and perfect functions.

The invention provides a time division long term evolution (TD-LTE) rapid switching method based on relay switching. The TD-LTE rapid switching method based on the relay switching aims at the phenomenon that channel switching of a high speed railway TD-LTE communication system is frequent and aims at meeting the requirements for short switching time and a high switching success rate. The TD-LTE rapid switching method based on the relay switching is characterized in that a train head train-mounted relay of a train and a train tail train-mounted relay of the train are respectively and additionally provided with a back-up train-mounted relay, main train-mounted relays and the back-up train-mounted relays are connected with a user in the train, when the train does not enter a switching zone, the user carries out communication through the main vehicle-mounted relays, when a source base station evolved node B (eNodeB) decides that switching is required according to a measurement report of user equipment (UE), the main train-mounted relays carry out the switching, meanwhile, the back-up train-mounted relays are started to transmit data flow, and an original data link is recovered after the train runs out of the switching zone. According to the TD-LTE rapid switching method based on the relay switching, switching time delay is reduced, and particularly, the phenomenon of call drop due to failed wireless link caused by hard switching of a long time evolution (LTE) system is reduced. The aim of rapid switching in high-speed moving environment is achieved. The times of communication call drop are reduced. The switching success rate is improved. Service quality of a high-speed broadband mobile service is enhanced. A multi-media broadband mobile internet service inside the high-speed railway train is developed in a promoted mode. The day-by-day increasing requirements of a passenger for a mobile communication service are met.

The invention discloses an antenna downward inclination angle determination method and device based on a geographic information system (GIS). The method comprises the following steps: determining an equivalent coverage radius of a cell of each base station according to base station location information in the GIS and the Thiessen polygon principle and determining a maximum coverage radius of the cell of each base station according to an application scene which the cell of each base station is located in; when the equivalent coverage radius is ascertained to be smaller than or equal to the maximum coverage radius, determining the antenna downward inclination angle of the base station which the cell belongs to based on the equivalent coverage radius; and when the equivalent coverage radius is ascertained to be larger than the maximum coverage radius, determining the antenna downward inclination angle of the base station which the cell belongs to based on the maximum coverage radius. According to the technical scheme of the antenna downward inclination angle determination method and device based on the GIS, the problems, that handling capacity in a border cell is reduced and a resource usage ratio is low, caused by unreasonable arrangement of the antenna downward inclination angle of the base station in same-frequency networking in a time division-long term evolution (TD-LTE) system can be avoided, same and adjacent channel interference among cells can be reduced effectively and network service quality and user experience effects are improved.

The invention discloses a realization method of a speaking right signaling of a broadband multimedia cluster system dispatching station based on TD-LTE (Time Division Long Term Evolution), which relates to a realization method of a speaking right signaling of a broadband multimedia cluster system dispatching station and solves the problems of low efficiency and easy mistake making of the traditional digital cluster technology. The realization method of the speaking right signaling is completed on the basis of a broadband multimedia cluster system. The system comprises a terminal connected with a broadband wireless access subsystem through an LTE-Uu (Long Term Evolution User to User) interface, the broadband wireless access subsystem is connected with a network subsystem through an S1-MME (Mobility Management Entity) interface, and the network subsystem and the broadband wireless access subsystem are connected with an operation maintenance subsystem. The specific procedures of the realization method are as follows: when group calling is established, a DC (data center) sends a speaking right application request to a TDS (Transaction Data Set), and the TDS replies a speaking right application response to inform the DC whether the speaking right is granted; when the DC owns the speaking right and conversation is finished, the DC sends a speaking right release request to the TDS, and the TDS releases the speaking right and returns a speaking right release response to the DC. The invention can satisfy the application requirements of commanding and dispatching.

The invention discloses a blind test efficiency improvement method for a TD-LTE (Time Division Long Term Evolution) system. Data repeat is utilized when the speed rates are matched at a sending terminal, sliding self-correlation is utilized at a receiving terminal, starting positions of data reuse are estimated, candidate sets are arranged according to the possibility, and blind tests are sequentially performed, so that the accuracy of the blind tests is improved; two large polymerization degree blind test sets are combined, so that the maximum blind test numbers are reduced; and judgment can be performed on a correlation value of a public search space first and then calculation can be performed when two search spaces simultaneously exist, so that the speed rates of the blind tests are improved. The blind test efficiency improvement method for the TD-LTE system can effectively improve the blind test efficiency and enables the blind tests to be rapid.

The invention discloses a group calling service rapid-continuing method, which is applied after the cell reselection of called user equipment (UE) in group calling in time vision long term evolution broadband digital trunking mobile communication system. The method comprises that: the UE transmits a message carrying a first cell to a base station where a target cell is, wherein the first cell represents a group calling service performed in a source cell by the UE; after receiving the message carrying the first cell, the base station transmits a group calling paging message to the UE; and the UE continues the group calling service according to the group calling paging message. By the group calling service rapid-continuing method, an original group calling service can be rapidly continued after the cell reselection of the UE, so the continuity and real-time of the group calling service are improved.

The invention provides a time division long term evolution (TD-LTE) broadband digital cluster business application appliance, a system and a method based on an enhanced multimedia broadcast multicast service (eMBMS). The method comprises that a packet data network gateway (PDN-GW) can be used for receiving the cluster business responding and founding cluster loading requests sent by a cluster scheduling management center and the cluster business responding and founding cluster loading requests can be transponded to a gateway, wherein the gateway is used for supporting a cluster business playing specialty. The cluster business responding and founding cluster loading requests are transponded a mobile management entity (MME) by the gateway. After the MME is configured with transmission bearing information, a wireless access bearer establishment can be launched to a base station with the transmission bearing information. After the base station is used for completing the wireless access bearer establishment, cluster business convention can be returned to the cluster scheduling management center to found a response by the MME. The TD-LTE broadband digital cluster business application appliance, the system and the method can be used for regarding a cluster communication as a business to integrate into a public honeycomb mobile system.

The invention provides an achieving method of dynamic regrouping serve and a broadband digital cluster system. The method is applied to the broadband digital cluster system based on time division long term evolution (TD-LTE). The method includes that after a cluster scheduling management center receives dynamic regrouping requests, authentication is conducted to objects sending the requests and users in operation objects carried in the requests; the dynamic regrouping requests further carry operation indication information; after the authentication is passed, the cluster scheduling management center sends group user information updating requests to a mobile management entity (MME), and the group user information updating requests carry label information of all users inside groups related by the operation; and after MME receives the group user information updating requests, corresponding users conduct updating of user group information through a group paging method. The achieving method achieves a dynamic regrouping function through minimal standard agreement modification, and is an important constituting part of the broadband digital cluster system based on TD-LTE.

The invention discloses an OPC (Object Linking and Embedding for Process Control) data acquisition and monitoring intelligent terminal based on TD-LTE (Time Division-Long Term Evolution). The OPC data acquisition and monitoring intelligent terminal comprises a TD-LTE communication management module, an OPC data service terminal, an OPC client terminal and an access control module. The OPC data acquisition and monitoring intelligent terminal based on the TD-LTE can establish a reliable data acquisition and control command transmitting channel between an upper management information system and underlying monitoring equipment, adopts a standard interface and wireless communication automatic networking functions, realizes the integration of enterprise information management and industry process real-time control, has the distributed monitoring and centralized data management capability, is high in data transmission speed, portable and movable and suitable for the vast majority of field data acquisition equipment controlled by an OPC server developed based on OPC-DA specifications, is provided with an open and efficient communication mechanism and provides a consistent solution on accessing field equipment data for a monitoring system.

The invention provides a terminal uplink / downlink HARQ (Hybrid Automatic Repeat Request) ACK / NACK (Acknowledgement / Negative Acknowledgement) information dispatching method and device. The uplink information dispatching method comprises the following step: a terminal confirms a subframe number of a subframe of the current ACK / NACK to be received, carries out database access control on a subframe database by adopting the subframe number as an index, obtains ACK / NACK information corresponding to the subframe number and dispatches the following PUSCH (Physical Uplink Shared Channel) new transmission or retransmission according to obtained information. The downlink information dispatching method comprises the following step: the terminal receives and decodes a TB (Transmission Block), generates ACK / NACK information, confirms the subframe number of the subframe of the received ACK / NACK information, carries out database access control on the subframe database by adopting the subframe number as the index and dispatches PUCCH (Physical Uplink Control Channel) / PUSCH to carry out ACK / NACK feedback according to the generated ACK / NACK information. By adopting the invention, the problems of complex ACK / NACK dispatching realization and resource waste by TD-LTE (Time Division-Long Term Evolution) terminal equipment can be solved.

An embodiment of the invention provides a TD-LTE (time division long term evolution) based power distribution and utilization network business management system. The system comprises an EPC (evolved packet core) network device, multiple base station devices and multiple terminal devices which form a TD-LTE wireless communication system. The terminal devices are connected with a business platform of a power distribution and utilization network, and collect business data of various power businesses in the business platform. The EPC network device is connected with a management system of the business platform of the power distribution and utilization network, processes the business data transmitted from the base station devices, and then transmits the processed business data to the management system of the business platform. Wireless coverage of a trial area is realized by establishing a TD-LTE power wireless broadband communication access network, a lot of capital investments for condition-limited optical cable construction and communication resource renting are avoided, and the businesses and communications in the power distribution and utilization network are effectively managed.

The invention discloses a random access detection device and a detection method in a TD-LTE (Time Division-Long Term Evolution) system. The device comprises a data extraction unit, a Fourier transform unit, a spectrum shifting unit, a local root sequence generating unit, a relative detection unit and a threshold detection unit, wherein the data extraction unit is used for extracting base band data; the Fourier transform unit is used for carrying out discrete Fourier transform on extracted data to obtain a frequency domain signal; the spectrum shifting unit is used for carrying out spectrum shifting on the frequency domain signal to obtain a frequency domain signal after the spectrum shifting; the local root sequence generating unit is used for generating N1 local frequency domain root sequences according to a logical root number broadcasted in broadcast information; the relative detection unit is used for carrying out relative frequency domain detection on the frequency domain signal after the spectrum shifting and the local frequency domain root sequences to obtain N1 time domain relative values; and the threshold detection unit is used for detecting and judging the time domain relative values according to a set threshold value, judging whether a terminal is allowed to be accessed into the system or not and calculating timing advance. The device and the method can be used for quickly detecting a random access precursor in the TD-LTE system, thereby greatly reducing the computation complexity and improving the operation efficiency.

The invention relates to a multimode mobile communication terminal and a working method thereof, wherein a TD-LTE (Time Division-Long Term Evolution) terminal communication module in the multimode mobile communication terminal is closed when no available TD-LTE network exists, an application processing module is used for determining whether services formerly built on a GSM-GPRS (Global System for Mobile Communication-General Packet Radio Service) network or a TD-SCDMA network are automatically rebuilt on the TD-LTE network according to the kinds and the requirements of the services when the TD-LTE terminal communication module is started and registered in TD-LTE network; and when the TD-LTE terminal communication module is closed, the services formerly built on the TD-LTE network are automatically rebuilt on the GSM-GPRS network or the TD-SCDMA network. The invention preferably solves the problems of high standby power consumption and poor service continuity caused by insufficient coverage at the initial stage of building TD-LTE network, and provides good user experience.

The embodiment of the invention discloses a method for transmitting secondary synchronization signals by introducing an uplink time slot to downlink, which is applied to a time division-long term evolution (TD-LTE) system comprising a terminal and a base station, and comprises the following steps: the terminal receives the secondary synchronization signals from the base station in a downlink special time slot of an uplink channel; the terminal calculates the transmitting power according to the secondary synchronization signals; and the terminal transmits access lead codes of a random access channel (RACH) to the base station according to the transmitting power, and carries out the RACH access process. In the embodiment of the invention, the secondary synchronization signals are transmitted in an uplink special time slot, so that the terminal can acquire the quality information of the uplink channel by receiving the secondary synchronization signals in a cell synchronizing phase, and the transmitting power can be determined according to the quality information of the uplink channel before the RACH process occurs, thereby reducing the steps of adjusting the transmitting power.

The invention discloses a fourth-generation multi-standard fully-compatible mobile radio-frequency front-end broadband low-noise amplifying device which comprises a single-end input and differential output noise cancellation type low-noise amplifier, a tracking filter quality factor boosting circuit and a class AB module, wherein the single-end input and differential output noise cancellation type low-noise amplifier is used for enabling noise cancellation and signal complementary addition by the aid of opposite phases of signals and noise; the tracking filter quality factor boosting circuit is used for increasing quality factors of an output cavity by adjusting negative transconductance so as to obtain optimal out-of-band interference filtering effects; and the class AB module is used for enabling a current mode amplifier not to be unsaturated so as to respond to strong out-of-band interference. The broadband amplifier adopts single-end input and uses single inductor to meet noise performance, can filter large out-of-band signals and covers TD-LTE (time division-long term evolution), TD-SCDMA (time division-synchronous code division multiple access) and quad-band GSM (global system for mobile communications), and the fourth-generation multi-standard fully-compatible mobile radio-frequency front-end broadband low-noise amplifying device has the advantages of low cost, multiple applicable standards, high data rate, high sensitivity, low noise and small occupied space.

The invention requests to protect a self-adaptive auxiliary synchronization signal detection method for a TD-LTE (time division-long term evolution) system, relating to the technical field of mobile communication and aiming at solving the problems in the aspects of low auxiliary synchronization signal detection accuracy and the like in the existing TD-LTE system. The method comprises the following steps: obtaining a timing fine synchronization position according to cross-correlation peak values of baseband signals received by a receiving end and master synchronization signals generated locally; leading the baseband signals of the receiving end to pass through a low-pass filter, remaining data on 62 subcarriers close to direct-current subcarriers, and obtaining a frequency-domain channel impulse response by the master synchronization signals; estimating the current channel environment according to the duration of the frequency-domain channel impulse response, adopting a self-adaptive feedback method to carry out modification on the frequency-domain channel impulse response; and according to the estimated value of the modified frequency-domain channel, adopting a coherent detection method to detect auxiliary synchronization signals.

The invention relates to a time division-long term evolution (TD-LTE) / time division-synchronous code division multiple access (TD-SCDMA) radio-frequency front transmitter-receiver system, which is characterized in that one output of a radio-frequency front circuit is connected with a baseband processor, the other output of the radio-frequency front circuit is connected with a signal input end of a single-pole four-throw switch respectively through a first power amplifier and a second power amplifier, one input end of the radio-frequency front circuit is connected with a signal output end of the single-pole four-throw switch and a second antenna, the other input end of the radio-frequency front circuit is connected with the baseband processor, and the single-pole four-throw switch is connected with a first antenna. The radio-frequency front circuit comprises a receiver, a transmitter and a frequency synthesizer, wherein the signal input end of the receiver is respectively connected with the signal output end of the single-pole four-throw switch, the second antenna and the output end of the frequency synthesizer, and the signal output end of the receiver is connected with the baseband processor; and the signal input end of the transmitter is connected with the baseband processor and the frequency synthesizer, and the signal output end of the transmitter is connected with the signal input end of the single-pole four-throw switch respectively through the first power amplifier and the second power amplifier. Due to the adoption of the TD-LTE / TD-SCDMA radio-frequency front receiver-transmitter system, the system complexity is reduced, the system cost is reduced, and the performance is improved.

The invention discloses a TTI (Transmission Time Interval) binding method for reducing business delaying in a TD-LTE (Time Division-Long Term Evolution) system. The TTI binding method comprises the following steps: utilizing a base station to determine whether a TTI binding function is configured to an edge user or not according to a continuously-received transmitting power margin reported by cell edge user UE (Unified Equipment) or detected uplink chain channel quality of the UE; determining an uplink dispatching result and a bound first physical uplink sharing channel (PUSCH) sending moment according to configuration of TDD (Time Division Duplex) uplink and downlink sub-frames, and a uplink authorization and data sending time relation; otherwise, carrying out data transmission according to normal dynamic or semi-static dispatching; continuously sending different RVs of the same TB to the base station by the cell edge UE with the binding function through a physical uplink sharing channel (PUSCH); after receiving the data, carrying out decoding processing on the data by the base station no matter whether the four RV exist in a caching region or not; judging whether the uplink data is successfully decoded at the base station side or not; if so, finishing the operation; otherwise, carrying out retransmission operation on the data. According to the TTI binding method, unnecessary RV waiting time can be greatly shortened so that the business transmission delaying of the TD-LTE system is reduced and the spectral efficiency and the system throughput are improved.

The invention discloses a time division-long term evolution (TD-LTE) dual-polarization radiation unit, which comprises symmetrical vibrator radiation arms, feed baluns and supporting arms, wherein the number of the symmetrical vibrator radiation arms is two pairs, and the two pairs of symmetrical vibrator radiation arms are distributed across; each pair of symmetrical vibrator radiation arms is fixed on a floor through the supporting arms respectively; and the number of the feed baluns is 2, one end of each feed balun is connected with one of the corresponding symmetrical vibrator radiation arm, and the other end of the feed balun is fixed at the bottom of the supporting arm of the other one of the corresponding symmetrical vibrator radiation arm. Because two pairs of symmetrical vibrators form an integrated structure, the dual-polarization radiation unit has electric properties such as high gain, wide working bandwidth, high isolation degree, low cross polarization level and the like.

The invention discloses a video encoding and transmitting method based on TD-LTE (time division long term evolution) channel detection. Adaptive video encoding and transmitting technology based on channel detection is used for TD-LTE system video services, a video rate is adaptively adjusted along with the change of channel conditions by adding a TD-LTE channel real-time detection module and a video encoding coefficient estimation module at a video source end, the real-time detection module obtains parameters of a TD-LTE system such as channel capacity, channel error rate and received signal strength at the video source end, so that video encoding coefficients such as resolution, a quantization coefficient QP and frame rate are determined, and the video encoding rate is adaptively adjusted based on channel detection. The video encoding and transmitting method has the advantages that the video source end can adaptively adjust encoding parameters and code stream rate to meet video data transmitting requirements under the condition of dynamically changing channels, video transmitting real-time performance and video transmitting continuity can be ensured, and the method solves the problems of high error rate, long delay, low channel use rate and the like when the video data are transmitted.

The invention discloses a system for automatically testing the performance of a TD-LTE (Time Division-Long Term Evolution) terminal, comprising a terminal tester and a PC (Personal Computer), wherein the terminal tester starts performance measurement under the control of the PC to carry out performance measurement on the TD-LTE terminal to be measured according to the information of each measuring item in an item configuring file of the PC and then transmits a measuring result to the PC. The system can successfully measure the performance of the TD-LTE terminal to be measured without artificial participation in the whole process of performance measurement so that the manpower cost is reduced, and the measuring progress is improved. The system can measure one item or all times for many times. The invention simultaneously discloses a method for automatically testing the performance of the TD-LTE terminal.