CN114698092B - TDD test method capable of automatically adjusting time delay and advance - Google Patents
TDD test method capable of automatically adjusting time delay and advance Download PDFInfo
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- 238000004891 communication Methods 0.000 claims abstract description 118
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
Abstract
The invention provides a TDD test method capable of automatically adjusting time delay and advance, which comprises a channel simulator used for simulating communication data to be transmitted in different types of communication channels, wherein the channel simulator is respectively connected with a base station frequency converter and a terminal frequency converter used for compensating and adjusting the communication data, the terminal frequency converter is in data intercommunication with a terminal antenna used for acquiring the communication data through a cable, the base station frequency converter is in data intercommunication with a base station antenna through a cable, the base station antenna is in data intercommunication with the base station through an air interface, and the base station is used for acquiring and reading bursts in the same time slot of different frequency domains and simultaneously giving a frame starting signal and a signal for switching up and down. The invention can accurately acquire the delay generated in the actual transmission process of the communication data, and compensates and adjusts the transmission data according to the delay so as to ensure the accuracy of the uplink and downlink switching of the TDD and improve the data transmission efficiency of the communication system.
Description
Technical Field
The invention relates to the technical field of time delay of uplink and downlink switching of TDD, in particular to a TDD test method capable of automatically adjusting time delay and advance.
Background
With the development of mobile communication technology, the requirements of people on communication are higher and higher, and the requirements of high-speed transmission cannot be met by the traditional low-frequency band and small bandwidth. The 5G NR starts and the mobile communication band is first extended to the millimeter wave band (5G NR FR2 band). And the duplex mode of millimeter wave frequency band communication only supports TDD (time division duplex communication technology), so that the uplink and downlink switching of TDD is crucial to the efficiency of system information transmission.
Frame structure: one TDMA frame is 10ms long, one frame includes two subframes with identical structures, each subframe is 5ms at times, each subframe includes 3 special time slots and 7 conventional time slots (TS 0-TS 6), 7 conventional time slots are used for transmitting user data or control information, TS0 is fixedly used as a downlink time slot in 7 conventional time slots, TS1 is fixedly used as an uplink time slot, and other TS 2-TS 6 time slots are freely switched between uplink and downlink according to requirements.
In practice, the data transmission and processing in the communication system will generate delay, which is easy to switch in uplink and downlink, and further results in data loss in the transmission processing process, which affects the data transmission efficiency of the communication system.
Disclosure of Invention
Accordingly, the present invention is to provide a method for testing TDD with automatic adjustment of delay and advance, which can more accurately obtain delay generated in actual transmission of communication data, and compensate and adjust transmission data according to the delay, so as to ensure accuracy of uplink and downlink switching of TDD, and improve data transmission efficiency of a communication system.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an automatic adjust TDD test system of time delay and lead, includes the channel simulator that is used for simulating communication data transmission in different grade type communication channel, the channel simulator is connected with respectively and is used for carrying out the basic station converter and the terminal converter of compensation adjustment to communication data, terminal converter is through cable and the terminal antenna data intercommunication that is used for acquireing communication data, basic station converter is through cable and basic station antenna data intercommunication, basic station antenna is through air interface and basic station data intercommunication, the basic station is used for acquireing and reading the burst in the same time slot of different frequency domains, gives the signal that the frame starts signal and uplink and downlink switch simultaneously.
Further, the base station includes a baseband processing unit for decoding communication data and giving feedback, the baseband processing unit is respectively in data communication with the channel simulator, the terminal frequency converter and the base station frequency converter, and the baseband processing unit is respectively used for giving a frame start signal, feedback of uplink and downlink switching and an advance duration, so that the channel simulator, the terminal frequency converter and the base station frequency converter can synchronously switch uplink and downlink.
Further, the baseband processing unit, the channel simulator, the terminal frequency converter and the base station frequency converter are all connected with the main control computer through the switch, and the main control computer acquires feedback data of the baseband processing unit and the channel simulator so as to control the terminal frequency converter and the base station frequency converter to act.
Further, the method comprises the steps of acquiring inherent delay generated by a base station due to transmission distance, simulating a transmission processing process of communication data in a base station system through a channel simulator, and acquiring dynamic delay generated by equipment data processing;
the TDD test system is identical to the transmission process of the analog communication data, and performs TDD dynamic self-adaptive test according to the dynamic delay and the inherent delay to obtain a dynamic compensation value of the dynamic delay and an inherent compensation value of the inherent delay.
Further, the inherent delay can be obtained by actually measuring the length of the optical cable, the length of the cable and the air interface distance, and calculating the inherent delay.
Further, the method for obtaining the dynamic delay comprises the following steps: according to the actual transmission process of the communication data, a communication channel is set in the channel simulator, and the master control computer acquires the dynamic delay of the communication channel by recording the time difference of the communication data input and output in the channel simulator.
Further, the communication data is transmitted through a frame, the frame comprises two subframes, the subframes comprise a plurality of time slots, the time slots comprise bursts for bearing the communication data, and the front ends of the bursts are provided with cyclic prefixes for identifying and acquiring the bursts;
the main control computer obtains actual cyclic prefix values in the same time slots of different frequency domains through the baseband processing unit, generates a cyclic compensation value according to the difference value between the actual cyclic prefix values and the theoretical cyclic prefix values, and the terminal frequency converter and the base station frequency converter adjust the positions of bursts in the same time slots of different frequency domains according to the cyclic compensation value, so that the time for the bursts in the same time slot to reach the base station is ensured to be in the cyclic prefix range, and the loss probability of communication data is reduced.
Further, the main control computer generates an actual compensation value of the actual communication base station according to the dynamic compensation value, the inherent compensation value and the cyclic compensation value, and circularly inputs the actual compensation value into a terminal frequency converter and a base station frequency converter of the TDD test system, and the main control computer obtains the transmission effect of communication data through the baseband processing unit.
Further, the main control computer continuously reads the actual cyclic prefix value of the communication data, dynamically adjusts the actual compensation value according to the actual cyclic prefix value, and inputs the actual compensation value into a corresponding terminal frequency converter or base station frequency converter, and the base station frequency converter or the terminal frequency converter adjusts the frame starting time and the burst position.
Further, the communication data includes uplink data and downlink data, the base station frequency converter is used for compensating and adjusting the downlink data, and the terminal frequency converter is used for compensating and adjusting the uplink data.
The invention has the advantages and positive effects that:
by constructing the TDD test system by using the channel simulator, the TDD test system simulates the transmission process of communication data in a communication channel, the master control computer obtains the time difference between the input and output communication data of the channel simulator, generates the dynamic delay of the communication channel, and calculates the inherent delay of the communication channel. The main control computer generates a compensation value according to the acquired inherent delay and dynamic delay, inputs the compensation value into the terminal frequency converter and the base station frequency converter, the TDD test system performs actual transmission simulation of communication data according to the compensation value, and adjusts the dynamic compensation value and the baseband compensation value according to the condition of the communication data acquired by the baseband processing unit, so that the compensation value generated by the delay in the transmission process of the communication data is accurately acquired, the transmission data of the actual communication base station is compensated and adjusted according to the delay, the uplink and downlink switching of TDD is accurately controlled, and the data transmission efficiency of the communication system is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is an overall block diagram of a TDD test system with automatic delay and advance adjustment according to the present invention;
FIG. 2 is a system connection diagram of a baseband processing unit in a TDD test system for automatically adjusting delay and advance according to the present invention;
FIG. 3 is a system connection diagram of a master computer in a TDD test system for automatically adjusting delay and advance according to the present invention;
fig. 4 is a test flow chart of a TDD test method of automatically adjusting delay and advance in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In actual use, as shown in fig. 1, the communication base station comprises a plurality of base transceiver stations, and a complete base transceiver station comprises wireless transmitting/receiving equipment, antennas (terminal antenna and base station antenna) and a signal processing part. The base transceiver station may be regarded as a radio modem responsible for the reception, processing, transmission and transmission of data signals, which are received by the active antenna elements of the communication base station.
The active antenna unit is connected with a baseband processing unit, and the baseband processing unit is used for acquiring bursts in frames, and the bursts are used for bearing communication data. The baseband processing unit decodes and reads the communication data in the burst and gives corresponding feedback. The communication data comprises uplink data and downlink data, and the feedback given by the baseband processing unit comprises a unified frame starting signal, an uplink and downlink switching signal and downlink data.
The TDD test system comprises a channel simulator for simulating the transmission of communication data in different types of communication channels, wherein the channel simulator is respectively connected with a base station frequency converter and a terminal frequency converter for performing dynamic compensation adjustment on the communication data, the terminal frequency converter and the base station frequency converter are both used for modulating wireless signals, converting received radio frequency signals into intermediate frequency signals which are convenient for the transmission processing of the channel simulator, and superposing the intermediate frequency signals with carriers to generate continuous intermediate frequency signals carrying the communication data.
The terminal frequency converter is in data intercommunication with a terminal antenna for acquiring communication data through a cable (when a TDD test system is built, a used base station antenna, the terminal antenna and an active antenna unit are small-sized devices), and the base station frequency converter is in data intercommunication with the base station antenna through the cable. When TDD uplink switching test is carried out, the mobile terminal sends out communication data, the terminal antenna receives the communication data and transmits the communication data to the terminal frequency converter, and the terminal frequency converter converts the communication data into intermediate frequency communication signals and inputs the intermediate frequency communication signals into the channel simulator; after the channel simulator simulates the transmission and processing process of communication data, the base station frequency converter converts the intermediate frequency communication signal into a radio frequency communication signal, and the radio frequency communication signal is sent out by the base station antenna.
The radio frequency communication signal is received by the active antenna unit, the active antenna unit is connected with the baseband processing unit through an optical cable, the baseband processing unit reads communication data received by the active antenna unit, decodes the communication data and reads information, judges the transmission efficiency of the data according to the read information content, and simultaneously gives a frame start signal, feedback of uplink and downlink switching and feedback of downlink data.
As shown in fig. 2, when the TDD test system performs the uplink and downlink switching test, in order to ensure that the channel simulator, the terminal frequency converter and the base station frequency converter move up and down synchronously, the baseband processing unit is respectively in data intercommunication with the channel simulator, the terminal frequency converter and the base station frequency converter. After the baseband processing unit gives feedback of frame starting signals and uplink and downlink switching, the channel simulator, the terminal frequency converter and the base station frequency converter act simultaneously, so that the accuracy of uplink and downlink transmission during TDD test can be ensured.
A base station system generally includes a plurality of terminal antennas, where the terminal antennas are used for receiving uplink data sent by a terminal device or sending downlink data sent by a baseband converter, so that a communication channel is formed between each terminal antenna and the base station antenna, and the communication channel is a transmission path of communication data.
Taking uplink transmission as an example: the terminal antenna sends uplink data, the uplink data is transmitted to the base station antenna through a communication channel, the base station antenna transmits the uplink data to the baseband processing unit through the base station equipment, the baseband processing unit decodes and identifies the uplink data, and downlink data (feedback data) is given according to the identified information.
The transmission process of the downlink data is opposite to the transmission process of the uplink data, the baseband processing unit acquires the downlink data, the downlink data is transmitted to the base station antenna through the base station equipment, and the base station antenna transmits to the terminal antenna through the corresponding communication channel.
The base station comprises a plurality of communication channels, because the geographic positions of different terminal antennas are different, communication devices used in the communication channels are not identical (the power of the devices is also different, and the generated delays are different), so that the delays of different communication channels are not identical, and the delays generated by communication data in different communication channels are defined as dynamic delays.
After the actual communication base station is built, the cable length, the optical fiber length and the distance of the air interface are fixed, and the coverage area of the terminal antenna is fixed, so that the delay generated by communication data on the cable, the optical fiber and the air interface tends to be fixed (named as inherent delay). The inherent delay of the communication channel can be calculated by acquiring the length of the optical fiber, the length of the optical cable and the distance of the air interface. Such as: the transmission delay formula in the optical fiber is: t= Lxn/v; where t is the transmission time, L is the fiber length, n is the medium refractive index, and v is the speed at which light propagates in vacuo.
As shown in fig. 3, the channel simulator, the baseband processing unit, the base station frequency converter and the terminal frequency converter are all connected with the main control computer through the switch, the main control computer obtains intermediate frequency communication signals input and output by the channel simulator, compares the received intermediate frequency communication signals, records the time difference of the channel simulator input and output by the same group of intermediate frequency communication signals, and defines the time difference as the dynamic time delay of the communication channel.
And transmitting communication data of different contents in different communication channels by using a channel simulator so as to acquire dynamic delays of the different channels. And inputting the calculated inherent delay into a main control computer, calculating a dynamic compensation value and an inherent compensation value of a communication channel by the main control computer according to the inherent delay and the dynamic delay, and guiding the dynamic compensation value and the inherent compensation value into a base station frequency converter and a terminal frequency converter.
When the TDD test system simulates the transmission process of communication data: the base station frequency converter or the terminal frequency converter dynamically adjusts the frame starting signal of uplink transmission or downlink transmission according to the dynamic compensation value and the inherent compensation value, so that the time of frame starting and the delay generated by the communication base station are compensated, the main control computer obtains the transmission efficiency of the communication data according to the communication data decoded by the obtained baseband processing unit, and correspondingly adjusts the dynamic compensation value or the inherent compensation value according to the transmission efficiency. After the whole dynamic compensation value or the inherent compensation value is adjusted, the TDD test is continued.
The uplink and downlink switching comprises the uplink and downlink switching among frames and the internal time slots of the frames. The subframe comprises 10 time slots, and other time slots can be freely configured to uplink and downlink except that a plurality of specific time slots correspond to specific uplink and downlink transmission, so that the situation of data loss in the transmission process is caused, and the subframe also comprises uplink and downlink switching in the same frame.
The data signals carrying communication data in TDD mode are bursts which are transmitted only in specific time slots in the allocated radio frames, the time slots of the specific frames may be consecutive (the time slots of each frame are allocated for transmitting data signals) or discontinuous (only part of the time slots in one frame are forced to be allocated for transmitting data signals).
The frame is composed of two subframes, the subframes comprise bursts of downlink pilot frequency (DwPTS) and uplink access (UpPTS), the downlink pilot frequency (DwPTS) is used for transmitting downlink synchronous codes, and the time slot length is 96 chips; uplink access (UpPTS) is used to transmit uplink synchronization codes, and the slot length is 160 chips. After receiving the downlink synchronous code or the downlink synchronous code, the baseband processing unit controls the uplink and downlink switching equipment, the base station frequency converter or the terminal frequency converter to synchronously act, so that the base station and the terminal equipment are uplink and downlink synchronized, and uplink and downlink transmission or downlink transmission is conveniently carried out.
The subframe also comprises a burst (random configured uplink and downlink burst, one burst is a time slot) for transmitting the data signal, the burst has the same structure and comprises two sections of data sequences, one section of training sequence code and one protection time slice, and the data sequences are symmetrically distributed at two ends of the training sequence code. In order to facilitate the identification of a burst sequence without breaking the orthogonality of the carriers, a guard time slice within the burst is set to a Cyclic Prefix (CP), and a sequence at the tail end of the burst is superimposed on the front end of the data sequence. Thus, the structure of a burst is sequentially composed of a cyclic prefix, a data sequence, a training sequence and a data sequence.
To further improve the accuracy of TDD up-down switching, it is required that the time for signals from different mobile terminals of the same subframe but different frequency domain resources to reach the active antenna element is substantially aligned, and the time for up-down switching is within the cyclic prefix of all bursts of the same time slot. When switching between uplink and downlink, the integrity of the data sequence and the adjacent sequence codes in the same time slot in different frequency domains can be ensured, and the transmission efficiency of the data is further ensured. The cyclic prefix has three lengths: conventional cp:4.687us, extension cp:16.67us, ultralong cp:33.33us. And the terminal antenna acquires communication data.
As shown in fig. 4, taking the downlink transmission procedure as an example: after receiving a data intercommunication request sent by a mobile terminal, a baseband processing unit feeds back downlink data, wherein the downlink data comprises duration with cyclic prefix, a main control computer obtains a theoretical cyclic prefix value through the baseband processing unit, the main control computer generates a cyclic compensation value according to the theoretical cyclic prefix value, and the main control computer obtains a dynamic compensation value, an inherent compensation value and the cyclic compensation value of a communication channel, generates an actual compensation value and inputs the actual compensation value into a terminal frequency converter and a base station frequency converter.
After receiving the downlink data, the terminal equipment feeds back the uplink data, the terminal antenna acquires the burst and transmits the burst to the terminal frequency converter, the terminal frequency converter superimposes the burst into a carrier wave, and the terminal frequency converter and the base station frequency converter adjust the positions of a plurality of bursts in different frequency domains in the same time slot according to the cyclic compensation value so as to compensate the time delay generated by the uplink and downlink switching equipment, and simultaneously ensure that the time of the burst in the same time slot reaching the base station is in the cyclic prefix range, thereby reducing the loss probability of the communication data.
After passing through terminal antenna, channel simulator, base station antenna and active antenna unit, uplink data is input to baseband processing unit, which decodes the uplink data, main control computer reads the actual cyclic prefix value of decoded uplink data, dynamically adjusts the actual compensation value according to the actual cyclic prefix value, and inputs the adjusted actual compensation value to terminal frequency converter or base station frequency converter again, to simulate the transmission of new communication data, base station frequency converter or terminal frequency converter readjust the frame start time and burst position in time slot according to the adjusted actual compensation value, and readjust and actually compensate value according to the feedback downlink data and received uplink data of baseband processing unit.
The communication data comprises uplink data and downlink data, the base station frequency converter is used for compensating and adjusting the downlink data, and the terminal frequency converter is used for compensating and adjusting the uplink data. The built TDD test system is used for obtaining the dynamic self-adaptive test of the TDD switch, the actual compensation value of the communication base station is obtained, the actual compensation value is the actual delay of the communication base station, the actual base station adjusts the equipment according to the actual delay, the accuracy of the uplink and downlink switching of the TDD can be effectively ensured, and the data transmission efficiency of the communication system is improved.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by this patent.
Claims (5)
1. The TDD test method is characterized by comprising a TDD test system, wherein the TDD test system comprises a channel simulator for simulating communication data to be transmitted in different types of communication channels, the channel simulator is respectively connected with a base station frequency converter and a terminal frequency converter for compensating and adjusting the communication data, the terminal frequency converter is in data intercommunication with a terminal antenna for acquiring the communication data through a cable, the base station frequency converter is in data intercommunication with the base station antenna through the cable, the base station antenna is in data intercommunication with the base station through an air interface, and the base station is used for acquiring and reading bursts in the same time slot of different frequency domains and simultaneously giving a frame starting signal and an uplink and downlink switching signal;
the method comprises the steps of acquiring inherent delay generated by a base station due to transmission distance, simulating a transmission processing process of communication data in a base station system through a channel simulator, and acquiring dynamic delay generated by equipment data processing;
the TDD test system is identical to the transmission process of the analog communication data, and performs TDD dynamic self-adaptive test according to the dynamic delay and the inherent delay to obtain a dynamic compensation value of the dynamic delay and an inherent compensation value of the inherent delay;
the inherent delay can be obtained by actually measuring the length of the optical cable, the length of the cable and the air interface distance and calculating the inherent delay;
the dynamic delay obtaining method comprises the following steps: setting a communication channel in the channel simulator according to the actual transmission process of the communication data, and acquiring the dynamic delay of the communication channel by the main control computer by recording the time difference of the communication data input and output in the channel simulator;
the communication data is transmitted through a frame, the frame comprises two subframes, the subframes comprise a plurality of time slots, the time slots comprise bursts for bearing the communication data, and the front ends of the bursts are provided with cyclic prefixes for identifying and acquiring the bursts;
the main control computer obtains actual cyclic prefix values in the same time slots of different frequency domains through the baseband processing unit, generates a cyclic compensation value according to the difference value between the actual cyclic prefix values and the theoretical cyclic prefix values, and adjusts the positions of bursts in the same time slots of different frequency domains according to the cyclic compensation value by the terminal frequency converter and the base station frequency converter, so that the time for the bursts in the same time slot to reach the base station is ensured to be in the cyclic prefix range, and the loss probability of communication data is reduced;
the main control computer generates an actual compensation value of the actual communication base station according to the dynamic compensation value, the inherent compensation value and the cyclic compensation value, and circularly inputs the actual compensation value into a terminal frequency converter and a base station frequency converter of the TDD test system, and the main control computer obtains the transmission effect of communication data through the baseband processing unit.
2. The method according to claim 1, wherein the base station includes a baseband processing unit for decoding communication data and giving feedback, the baseband processing unit is in data communication with the channel simulator, the terminal frequency converter and the base station frequency converter, and the baseband processing unit is used for giving a frame start signal, feedback of uplink and downlink switching and an advance duration, so as to synchronize the channel simulator, the terminal frequency converter and the base station frequency converter to uplink and downlink switching.
3. The method for testing the TDD system according to claim 2, wherein the baseband processing unit, the channel simulator, the terminal frequency converter and the base station frequency converter are all connected with the main control computer through the switch, and the main control computer obtains feedback data of the baseband processing unit and the channel simulator so as to control the terminal frequency converter and the base station frequency converter to act.
4. The method according to claim 1, wherein the master computer continuously reads an actual cyclic prefix value of the communication data, dynamically adjusts an actual compensation value according to the actual cyclic prefix value, and inputs the actual compensation value to a corresponding terminal frequency converter or base station frequency converter, and the base station frequency converter or terminal frequency converter adjusts a frame start time and a burst position.
5. The method for TDD test with automatic delay and advance adjustment according to claim 1, wherein the communication data includes uplink data and downlink data, the base station frequency converter is used for compensating and adjusting the downlink data, and the terminal frequency converter is used for compensating and adjusting the uplink data.
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| CN105282766A (en) * | 2014-07-11 | 2016-01-27 | 普天信息技术有限公司 | Method of simulating terminal and base station access distance and system simulator |
| WO2016127688A1 (en) * | 2015-02-15 | 2016-08-18 | 中兴通讯股份有限公司 | Method and system for simulating borderless network channel environment, and computer storage medium |
| CN111555826A (en) * | 2020-04-28 | 2020-08-18 | 中国信息通信研究院 | Millimeter wave end-to-end performance test system and method facing base station |
| CN113133120A (en) * | 2021-04-22 | 2021-07-16 | 海能达通信股份有限公司 | Communication scheduling method, system, terminal and base station equipment |
| CN113783630A (en) * | 2021-08-13 | 2021-12-10 | 中国信息通信研究院 | System and method for dynamically testing terminal performance |
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