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WO2006050635A1 - Procede pour mesurer la qualite d'une voie sans fil dans un systeme d'acces multiple ofdm - Google Patents

Procede pour mesurer la qualite d'une voie sans fil dans un systeme d'acces multiple ofdm Download PDF

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Publication number
WO2006050635A1
WO2006050635A1 PCT/CN2004/001302 CN2004001302W WO2006050635A1 WO 2006050635 A1 WO2006050635 A1 WO 2006050635A1 CN 2004001302 W CN2004001302 W CN 2004001302W WO 2006050635 A1 WO2006050635 A1 WO 2006050635A1
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WIPO (PCT)
Prior art keywords
test
terminal
base station
information
message
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PCT/CN2004/001302
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English (en)
Chinese (zh)
Inventor
Xuesong Wang
Yanwei Wu
Ning Wang
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2004/001302 priority Critical patent/WO2006050635A1/fr
Priority to CN200480043666XA priority patent/CN1993910B/zh
Publication of WO2006050635A1 publication Critical patent/WO2006050635A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication

Definitions

  • the present invention relates to a method for wireless channel quality measurement, and more particularly to measurement of channel state and packet transmission error rate in a wireless communication system employing orthogonal frequency division multiplexing multiple access techniques (e.g., OFDM).
  • OFDM orthogonal frequency division multiplexing multiple access techniques
  • Orthogonal Frequency Division Multiple Access (OFDM) technology was applied to the military field in the 1960s and gradually applied to the civilian sector after the 1970s. This modulation method has a high spectrum utilization and is suitable for use in wireless data transmission.
  • OFDM Orthogonal Frequency Division Multiple Access
  • FIG. 1 The structure of a conventional OFDM system using a digital modulation technique is shown in Figure 1, in which digital modulation is used, such as QPSK (quadruple phase shift keying), QAM (quadrature amplitude modulation - quadrature) Amplitude modulation ), PAM (pulse amplitude modulation), etc., of course, analog modulation techniques can also be used.
  • the coding method can take various forms, such as RS (Reed-Solomon) code, convolutional code, TCM (trellis coded modulation) code, Turbo code, and the like.
  • RS Random-Solomon
  • the pilot is inserted, and the inverse fast Fourier transform (IFFT operation) is performed after serial-to-parallel conversion, and then subjected to parallel-to-serial conversion, sent to the radio unit for processing, and finally sent to the transmitting antenna.
  • IFFT operation inverse fast Fourier transform
  • the purpose of inserting the cyclic prefix and windowing here is to overcome the multipath interference and to facilitate the fast Fourier transform (FFT operation) on the receiver side to reduce the spur of the transmitted signal.
  • the receiving process is: after the RF-transformed signal from the receiving antenna is subjected to A/D processing, converted into digital information, serial-to-serial converted, FFT operation and parallel-to-serial conversion are performed, channel estimation and channel correction are performed, and digital is performed. Demodulation, deinterleaving and decoding, complete the processing.
  • OFDM systems generally use multi-carrier technology to convert high-speed data streams through serial-to-parallel conversion, so that the duration of data symbols on each sub-carrier is relatively increased, so that the inter-symbol interference ISI caused by the time dispersion of the wireless channel can be effectively reduced.
  • InterSymbol Interference this The method of inserting a cyclic prefix is used to eliminate the adverse effects of ISI.
  • 2 is a time domain waveform diagram of an OFDM symbol using a cyclic insertion prefix.
  • Tb represents the effective symbol period in the OFDM signal
  • Tg is the inserted cyclic prefix, which is the same as part of the Tb period
  • Ts is the entire time. Multipath interference can be overcome by periodically inserting the cyclic prefix Tg.
  • the OFDM system since there are multiple orthogonal subcarriers in the OFDM system, and the output signal is a superposition of multiple subchannel signals, there is a disadvantage that is susceptible to frequency deviation compared with the single carrier system. Since the spectrums of the subchannels overlap each other, this imposes strict requirements on the orthogonality between them. At the same time, the OFDM system also has the following advantages. For example, due to the frequency selectivity of the wireless channel, it is impossible for all subcarriers to be in a relatively deep fading condition at the same time. Therefore, the signal bit can be fully utilized by dynamic bit allocation and dynamic subchannel allocation. Higher system subchannels, thereby improving system performance.
  • a subchannel that is not applicable to one user may be a subchannel with better performance for other users, so the subchannel will be turned off unless one subchannel is not applicable to all users. , but the probability of this happening is very small. And because narrowband interference can only affect a small fraction of subcarriers, OFDM systems can resist this narrowband interference to some extent.
  • the offset of the carrier frequency only causes a certain amplitude attenuation and phase rotation on the received signal, which can generally be overcome by equalization and the like.
  • the offset of the carrier frequency will cause interference between the sub-channels, and for the orthogonal frequency division multiplexing system that requires the sub-carriers to maintain strict synchronization, the frequency offset of the carrier is brought about.
  • the impact is more serious, so sensitivity to frequency deviation is one of the main drawbacks of OFDM systems, so measures must be taken to overcome this inter-channel interference ICI.
  • Common methods include two methods of inserting pilot synchronization and maximum likelihood synchronization.
  • FIG. 3 is a frequency domain diagram of an OFDM symbol that implements synchronization by inserting a pilot channel.
  • the pilot synchronization method is to add a pilot carrier to the normal signal, so that when the receiver performs processing, the pilot can be used to implement carrier synchronization.
  • capture Get the stage and the tracking stage Generally divided into two processes in the receiver, capture Get the stage and the tracking stage.
  • the frequency deviation can be large, which may be several times the subcarrier spacing.
  • the rough frequency estimation is performed as soon as possible; but in the tracking phase, only small frequency fluctuations need to be processed.
  • pilot synchronization method Another benefit of using the pilot synchronization method is that channel estimation and channel quality measurements can be made by measuring the pilot channel.
  • the content of the pilot channel is known in advance by the receiver, and the receiver can determine the quality of the wireless channel in the actual transmission process according to the received pilot channel, and adjust the data transmission process as the quality parameter of the data channel. Modulation and coding methods used in the medium, etc.
  • One of the objects of the present invention is to propose a method for measuring the quality of forward channel data transmission in an OFDM system.
  • One of the objects of the present invention is to propose a method for measuring the quality of reverse channel data transmission in an OFDM system.
  • One of the objects of the present invention is to propose a method for measuring the maximum throughput of an OFDM system air interface.
  • One of the objects of the present invention is to propose a method for measuring the wireless coverage of an OFDM system.
  • One of the objects of the present invention is to propose a method for simulating the data transmission situation of an actual user in an OFDM system to achieve the purpose of the face certificate system.
  • the present invention provides a method for measuring downlink transmission quality between a base station and a terminal in a wireless communication system employing orthogonal frequency division multiplexing multiple access technology, the method comprising the following steps : negotiating test parameters between the base station and the terminal; Transmitting, by the base station, a test data packet to the terminal; returning, by the terminal, a reception result of the test data packet to the base station; and obtaining, by calculation, the transmission quality information of the downlink.
  • the present invention provides a method for measuring an uplink transmission quality between a terminal and a base station in a wireless communication system employing orthogonal frequency division multiplexing multiple access technology, The method includes the following steps: negotiating test parameters between the terminal and the base station; transmitting a test data packet from the terminal to the base station; and returning, by the base station, a reception result of the test data packet to the terminal; And obtaining transmission quality information of the uplink by calculation.
  • the quality of the downlink channel and the uplink channel can be measured by using the method of the invention, and the measurement of the downlink channel and the uplink channel does not interfere with each other.
  • the method of the present invention can be tested at a fixed rate or a variable rate, since different transmission rates can correspond to different modulation and coding modes, so that different modulation and demodulation or coding and decoding performance can be measured by using different test rates.
  • the method of the present invention can support the test of maximum throughput.
  • the test data packet can be sent to the bandwidth scheduling module of the system to apply for the largest possible transmission bandwidth until it cannot be provided, so that the actual situation can be measured.
  • Maximum data throughput for the air channel can be provided.
  • the coverage of the network can be accurately evaluated during network planning and actual network acceptance, and the PER and system performance at various points in the coverage area are measured.
  • FIG. 1 is a block diagram of an OFDM system
  • 2 is a time domain waveform diagram of an OFDM signal to which a cyclic prefix is added;
  • FIG. 3 is a waveform diagram of an OFDM signal in which a pilot subcarrier is inserted
  • FIG. 5 is a schematic flowchart of a downlink test call initiated by a base station to a terminal in a loopback mode
  • FIG. 7 is a structural diagram of a device for processing a test packet by a terminal in a downlink loopback test mode
  • FIG. 8 is a schematic flow chart of a test call from the terminal to the base station JL3 ⁇ 4 in the non-loopback mode
  • FIG. 9 is a schematic flowchart of a method for a terminal to initiate an uplink channel test statistic information acquisition and clearing a message to a base station. detailed description
  • the terminal 3 After the terminal 3 is powered on, it first scans and synchronizes with the downlink. Once the physical layer has reached synchronization, the MAC layer will attempt to obtain control parameters for the upstream and downstream channels. When the terminal 3 captures the Downlink Map DL-MAP message, it establishes a synchronization relationship with the downlink.
  • the terminal 3 After obtaining the synchronization, the terminal 3 waits for the Uplink Channel Descriptor UCD message from the base station 1 to obtain the transmission parameters of the possible uplink channel.
  • terminal 3 also performs at least one ranging process to obtain the correct timing offset and power adjustment.
  • the uplink situation is obtained by using the UCD message, and the time slot for initializing the ranging is obtained through the uplink mapping (UPlink Map) UL-MAP message, and the terminal 3 sends the time slot to the base station 1 at the moment.
  • Ranging Request RNG-REQ message once the base station 1 successfully receives the RNG-REQ message, it feeds back a Ranging Response R G-RSP message, in which the base station 1 will assign it to the terminal.
  • the present invention gives One of the methods is: when measuring the downlink quality, the base station first initiates a downlink channel test request message, that is, a DCT-REQ (Downlink Channel Test Request) message, after establishing a call connection with the terminal. To request the parameters necessary for the test.
  • a downlink channel test request message that is, a DCT-REQ (Downlink Channel Test Request) message
  • the message includes the following parameters: (1) message type; (2) the sequence number of the DCT-REQ message, each time the newly transmitted DCT-REQ message is incremented based on the sequence number of the previous DCT-REQ message, the parameter is (3) used to indicate the identifier of the terminal receiving the message; (4) test the data source generation mode, including the random mode and the fixed mode: when in the random mode, the test data is generated in a pseudo-random manner; In fixed mode, test data is generated in a predefined manner; (5) data rate mode, including variable rate mode and fixed rate mode; (6) data loopback mode, indicating whether loopback is used; (7) selecting fixed rate Under the mode test condition, the rate of the selected test packet: when the parameter is equal to "0", it is the Blank mode; when the parameter is equal to "1111,", it is the maximum rate mode; when the parameter is equal to other, it represents the other Fixed test rate.
  • the terminal After receiving the DCT-REQ message, the terminal checks its own test capability, and then sends a downlink channel test response message, that is, a DCT-RSP (Downlink Channel Test Response) message, to the base station to feed back the negotiated test parameters.
  • the message includes the following parameters: (1) message type; (2) the sequence number of the DCT-RSP message, each time the newly sent DCT-RSP message is incremented based on the sequence number of the previous DCT-RSP message, the parameter is (3) an identifier for indicating the terminal that receives the message; (4) a verification code indicating whether the terminal succeeds or fails to negotiate the test request in the DCT-REQ message, and if not, gives the reason; (5) the terminal The maximum rate that can be supported. This parameter occurs when the verification code indicates that the rate requested by the base station exceeds the maximum rate supported by the terminal.
  • a DCT-RSP Downlink Channel Test Response
  • the base station and the terminal can negotiate the test packet rate to be transmitted for the test call, and have two modes of fixed rate and variable rate.
  • the variable rate mode the data rate sent by the base station to the terminal will change at a time, that is, a non-fixed rate.
  • the base station first informs the terminal of the data rate to be transmitted, and the terminal judges according to its own situation. If the terminal cannot support the data rate to be sent by the base station, it returns a failure indication and tells the base station that it can The maximum data rate received.
  • the base station supports sending the data rate mode of the Blank to the terminal.
  • the base station can also test the maximum data rate mode of the terminal.
  • the base station first randomly selects a data rate to transmit to the terminal, and applies a sufficiently wide downlink bandwidth to the bandwidth scheduling control module of the system during the transmission process, until the system cannot satisfy the MAC header. That is, the BR setting in the Bandwidth request header is performed. When the maximum bandwidth that the system can support is reached, the maximum data rate is maintained for testing. However, in the Loopback test mode mode, the application for maximum bandwidth should consider the uplink situation at the same time, especially for the TDD system.
  • the advantage of using the maximum data rate mode test is that it can measure the maximum data throughput of the base station's downlink transmission.
  • the error detection mode of the terminal for downlink data can be completed by data source comparison. To implement this method, the terminal side has a corresponding data source regeneration device. The data source reproducing device performs the data source generating method according to the transmitting end, and ensures that the content of the data packet generated by the reproducing device is consistent with the content generated by the data source at the transmitting end.
  • the base station After receiving the DCT-RSP message, the base station sends a Downlink Channel Test Acknowledge DCT-ACK message to the terminal, where the message includes the following parameters: (1) type of message; (2) DCT-ACK message Serial number, each new DCT-ACK message is incremented based on the previous DCT-ACK message sequence number, the parameter is optional; (3) is used to indicate the identifier of the terminal receiving the message;
  • the verification code indicates the reply information after receiving the DCT-RSP message, which is used to indicate success or failure.
  • the terminal After the terminal receives the DCT-ACK message, it will be ready to receive test packets from the base station. After the DCT-ACK message is sent, the base station will send a test packet of a predetermined rate to the terminal. This process is shown in Figure 5.
  • the base station When the test call of the downlink wide measurement is to be stopped, the base station will send a downlink channel test statistics rely message (DCTStat-REQ) to the terminal, and set the StopTest field in the DCTStat-REQ message to "1" to notify the terminal to test. End.
  • DCTStat-REQ downlink channel test statistics rely message
  • the terminal After receiving the DCTStat-REQ message, the terminal determines that if the StopTest field is "1", it does not receive the test data packet from the base station, and returns the downlink channel test statistical response message DCTStat-RSP of the base station; the base station receives the DCTStat After the RSP message, it is judged that if the success flag is included, the test packet is stopped.
  • the base station can also obtain the statistics information of the terminal side by sending a DCTStat-REQ message to the terminal.
  • the DCTStat-REQ information includes the following parameters: (1) the type of message; (2) The sequence number of the DCTStat-REQ series message, each time the newly transmitted DCTStat-REQ message is incremented on the basis of the previous DCTStat-REQ message sequence number; (3) the identifier of the terminal used to indicate the message; (4) The flag used to inform the terminal that the test process is to end or continue; once the terminal receives the DCTStat-REQ information from the base station, the terminal will reply the base station with the downlink channel test statistical response message DCTStat-RSP.
  • the DCTStat-RSP message includes the following parameters: (1) the type of the message; (2) the sequence number of the DCTStat-RSP series message, each time the newly transmitted DCTStat-RSP message is incremented based on the sequence number of the previous DCTStat-RSP message; (3) an identifier for indicating the terminal that receives the message; (4) a verification code indicating that the reply message after receiving the DCTStat-REQ message is used to indicate success or failure; (5) the terminal is in the downlink test call The number of correct test packets received during the process. This parameter only appears if the verification code is displayed as successful.
  • the base station can query the number of correct test packets received by the terminal and send the downlink channel state quality by sending a DCTStat-REQ message to the terminal at any time.
  • the base station side maintain the following statistics related to the test process:
  • dSentPakNum the number of test data packets sent by the base station to the terminal
  • dlRevPakNum The number of test packets received by the base station and judged to be correct from the terminal loopback.
  • the base station should clear the downlink test statistics maintained by the terminal before starting the test (also during the test), which can be completed by the base station initiating a downlink channel test clear request message (DCTClear-REQ) to the terminal.
  • the DCTClear-REQ message includes the following parameters: (1) the type of the message; (2) the sequence number of the DCTClear-REQ series message, each time the newly transmitted DCTClear-REQ message is incremented based on the previous DCTClear-REQ message sequence number; (3) An identifier used to indicate the terminal receiving the message.
  • the terminal After the terminal receives the DCTClear-REQ message from the base station, the terminal will maintain it. The statistics related to the downlink test are cleared. Upon completion, the downlink channel test clear response message (DCTClear-RSP) will be replied to the base station.
  • the DCTClear-RSP message includes the following parameters: (1) the type of the message; (2) the sequence number of the DCTClear-RSP series message, each time the newly transmitted DCTClear-RSP message is incremented based on the sequence number of the previous DCTClear-RSP message;
  • the base station After receiving the DCTClear-RSP message, the base station will also reset the registers of the statistics information related to the DCT test that it maintains, and set it to 0.
  • the terminal performs the test process, and then the received demodulated and decoded test data packet is passed through the buffer, and then re-encoded and modulated.
  • the base station is sent back to the base station, and the process performed by the base station is as shown in FIG.
  • 30-32 are receiving devices in the terminal.
  • 30 is an RF receiving device in the terminal, which amplifies and down-converts the received radio frequency signal, and finally becomes a digital signal and sends it to the demodulating device 31.
  • 31 is a demodulation device for OFDM, which mainly estimates and synchronizes channels, and performs operations such as FFT.
  • 32 is a deinterleaving and decoding device.
  • 35-37 is a transmitting device in the terminal, and 35 is an encoding and interleaving device that encodes and interleaves the data stream to be transmitted.
  • 36 is an OFDM modulation apparatus that performs an IFFT operation on the encoded and interleaved data, and inserts a cyclic prefix, a pilot, and the like.
  • 37 is an RF transmitting device, which performs D/A conversion on the modulated data, and is amplified by up-conversion and transmitted.
  • 34 is a statistical computing device. In the non-loopback test mode, statistically judges the received DCT test data packet from the base station, determines whether the received test data packet is correct, and counts the number of correct test data packets received.
  • the device 33 for the buffer, in non-Loopback In the test mode, the device 33 sends the received test data packet from the base station to the device 34 for statistical determination, and in the Loopback test mode, the device 33 sends the received test data packet from the base station directly to the device 35.
  • the coding/interleaving, modulation, and RF conversion are directly sent back to the base station.
  • the base station side compares and counts the returned Loopback test packets.
  • the quality of the forward and reverse links can be tested at the same time.
  • the base station can initiate a loopback call to the terminal to test the base station under the condition of ensuring the quality of the forward link. Receiver performance. Of course, this can only be done when there is someone on the base station side. If the quality of the reverse link is judged during the wild start, the terminal side can request the uplink channel test (UTT) from the base station side. .
  • UTT uplink channel test
  • the base station calculates various statistical parameters to obtain the quality information of the downlink transmission link.
  • the packet error rate PER ( % ) of the downlink can be calculated by the following formula:
  • dRevPakNum is the number of test packets received from the base station and determined by the terminal
  • dSentPakNum is the number of test packets sent by the base station to the terminal.
  • the throughput of the downlink can be calculated by the following formula:
  • dTestStartTime is the test start time and dTestEndTime is the test end time.
  • the uplink packet error rate UpLinkPER ( The calculation of %) can be done by the following formula:
  • the dlRevPak um is the number of loopback test packets that the base station receives from the terminal loop and is determined to be correct.
  • the dSentPakNum is the number of loopback test packets sent by the base station to the terminal.
  • the second method of the present invention is that, when measuring the uplink quality, the terminal first sends an uplink to the base station after establishing a call connection with the base station.
  • the channel channel test request message that is, the UCT-REQ (Uplink Channel Test) message
  • the message body format includes the following parameters: (1) message type; (2) serial number of the UCT-REQ message, each newly issued UCT-REQ The message is incremented on the basis of the previous UCT-REQ message sequence number, which is optional; (3) is used to indicate the identifier of the terminal receiving the message; (4) the test data source generation mode is divided into random Mode and fixed mode: When in random mode, test data is generated in a pseudo-random manner; when in fixed mode, test data is generated in a predefined manner; (5) data rate mode, select variable rate mode test or fixed rate Mode to test; (6) Data loopback mode, indicating whether loopback is used; (7) Number of selected tests under the condition of selecting fixed rate mode test Rate packet; when the parameter is equal to "0" for the Blank mode; when the parameter is equal to "1111", the maximum rate mode; when the parameter is equal to the other, it represents other fixed test rate.
  • UCT-REQ Uplink
  • the base station Once the base station receives the message, it will reply the terminal with the uplink channel test response message.
  • the message includes the following parameters: (1) message type; (2) sequence number of the UCT-RSP message, each time the newly issued UCT-RSP message is based on the sequence number of the previous UCT-RSP message Increment, the parameter is optional; (3) is used to indicate the identifier of the terminal receiving the message;
  • the verification code represents the success or failure of the terminal to negotiate the test request in the UCT-REQ message, and if it fails, the reason is given.
  • the maximum rate that the base station can support This parameter occurs when the verification code indicates that the rate requested by the terminal exceeds the maximum rate supported by the base station.
  • the terminal can negotiate with the base station on the test packet rate to be transmitted by the test call, and has two modes of fixed rate and variable rate.
  • the variable rate mode the data rate sent by the terminal to the base station will change at a time, that is, a non-fixed rate.
  • the terminal In the fixed rate mode, the terminal first informs the base station of the data rate to be transmitted, and the base station determines according to its own situation. If the base station cannot support the data rate to be sent by the terminal, it returns a failure indication and tells the terminal that it can. The maximum data rate received. At the same time, the terminal supports sending the data rate mode of the Blank to the base station. In addition, the terminal may also initiate a test of the maximum data rate mode to the base station.
  • the terminal randomly selects a data rate to transmit to the base station, and during the sending process,
  • the bandwidth scheduling control module of the system relies on a sufficiently wide uplink bandwidth until the system cannot meet the requirements, such as the BR setting in the MAC header, that is, the Bandwidth request header.
  • the maximum bandwidth that the system can support is reached, the maximum data rate is maintained for testing.
  • the maximum bandwidth should be considered in consideration of the downlink, especially for the TDD system.
  • the advantage of using the maximum data rate mode is that the maximum data throughput of the base station's uplink transmission can be measured by this test mode.
  • the error detection mode of the uplink data by the base station can be completed by data source comparison.
  • the base station side needs to have a corresponding data source regeneration device.
  • the data source reproducing device performs the data source generating method according to the transmitting end, and ensures that the content of the data packet generated by the reproducing device is consistent with the content generated by the data source at the transmitting end.
  • the terminal After receiving the UCT-RPS message, the terminal sends an Uplink Channel Test Acknowledgement (UCT-ACK) message to the base station, and the message includes the following parameters: (1) the type of the message; (2) the serial number of the UCT-ACK message, each time The newly issued UCT-ACK message is incremented based on the previous UCT-ACK message sequence number, which is optional; (3) is used to indicate the identifier of the terminal receiving the message; (4) the verification code represents the reception The reply message after the UCT-RSP message is used to indicate success or failure.
  • UCT-ACK Uplink Channel Test Acknowledgement
  • the base station After the base station receives the UCT-ACK message, it will be ready to receive the test data packet from the terminal. After the terminal sends a UCT-ACK message, it will send a test packet of a predetermined rate to the base station. This process is shown in Figure 8.
  • the terminal sends an uplink channel test statistic request message UCTStat-REQ to the base station, and sets the end flag field StopTest in the UCTStat-REQ message to "1" to notify the end of the terminal test.
  • the base station receives the UCTStat-REQ message, it determines that if the StopTest field is "1", it will no longer receive the obtained test data packet, and reply to the terminal UCTStat-RSP message, and the terminal receives the UCTstat-RSP message. After judging that if the success flag is included, the test packet will be stopped.
  • the terminal sends the uplink channel test statistics request message UCTStat-REQ to the base station, and can also be used to obtain the statistics information of the base station side.
  • the UCTStat-REQ information includes the following parameters: (1) the type of the message; (2) the serial number of the UCTStat-REQ series message, each new transmission The UCTStat-REQ message is incremented based on the previous UCTStat-REQ message sequence number; (3) the identifier used to indicate the terminal receiving the message; (4) the flag used to inform the base station that the test process is ending or continuing.
  • the base station will reply to the terminal for the channel test statistical response message (UTTStat-RSP).
  • the UCTStat-RSP message includes the following parameters: (1) the type of the message; (2) the sequence number of the UCTStat-RSP series message, each time the newly issued UCTStat-RSP message is incremented on the base of the previous UCTStat-RSP message sequence number; (3) an identifier for indicating the terminal that receives the message; (4) a verification code, which represents a reply message after receiving the UCTStat-REQ message, used to indicate success or failure; (5) the base station is in the uplink test call The number of correct test packets received during the process. This parameter only appears if the verification code is displayed as successful.
  • the terminal can query the number of correct test packets received by the base station by sending a UCTStat-REQ message to the base station at any time, and calculate the uplink channel state quality.
  • the terminal side maintain the following statistics related to the test process:
  • uSentPakNum The number of test data packets sent by the terminal to the base station
  • ulRevPakNum The number of test packets received by the terminal that are judged to be correct from the loopback of the base station.
  • the terminal should clear the statistics of the maintenance of the base station side before starting the test (also during the test), which can be completed by the terminal initiating an uplink channel test clear request message (UTTClear-REQ) to the base station.
  • the UCTClear-REQ message includes the following parameters: (1) the type of the message; (2) the sequence number of the UCTClear-REQ series message, each time the newly issued UTCCrear-REQ message is incremented on the basis of the sequence number of the previous UTCLerr-REQ message; (3) An identifier used to indicate the terminal receiving the message.
  • the base station After the base station receives the UTCCrear-REQ message from the terminal, the base station will maintain itself. All statistics related to the uplink test are cleared. Upon completion, the terminal will reply with an Upstream Channel Test Clear Response message (UCTClear-RSP).
  • the UCTClear-RSP message includes the following parameters: (1) the type of the message; (2) the sequence number of the UCTClear-RSP series message, each time the newly issued UTCdlear-RSP message is incremented based on the sequence number of the previous UTCClear-RSP message; (3) an identifier for indicating the terminal that receives the message; (4) a reply message after receiving the UCTCaler-REQ message, indicating success or failure.
  • the terminal After receiving the UCTClear-RSP message, the terminal will also reset the registers of the statistics information related to the UCT test that it maintains, and set it to 0.
  • UCTStat-REQ UCTStat-DSP and UCTCIear-REQ
  • UCTClear-RSP messages are shown in Figure 9 for message interaction between the terminal and the base station.
  • UCTClear-REQ, UCTClear-RSP messages are generally executed before the test starts, and UCTStat-REQ, UCTStat-DSP messages can be initiated at any time during the test.
  • the terminal After the test is over, the terminal notifies the base station that the test is over by setting the StopTest bit in the UCTStat-REQ message.
  • the base station If the terminal initiates a loopback mode UCT test call to the base station, the base station performs the test process, and then receives the demodulated and decoded test data packet through the buffer, and then re-encodes and modulates. Send back to the terminal on the uplink.
  • the process performed by the base station is similar to the case where the terminal performs during the DCT Loopback test. Refer to Figure 7 and its description.
  • the terminal side compares and counts the returned Loopback test packets.
  • the quality of the forward and reverse links can be tested at the same time.
  • the terminal can be tested by the terminal to the base station by loopback call under the condition of ensuring the uplink quality. Receiver performance, especially in laboratory environments for testing and productivity testing.
  • the shield information of the uplink transmission link is obtained through calculation of the terminal through various statistical parameters.
  • the uplink packet error rate UpLinkPER ( % ) can be calculated by the following formula:
  • uSentPakNum is the number of test packets that the base station receives from the terminal and is judged to be correct
  • uSentPakNum is the number of test packets sent by the terminal to the base station.
  • the throughput of the uplink, UpLinkThroughput ( bps ), can be calculated as follows:
  • uTestStartTime is the test start time and uTestEndTime is the test end time.
  • the downlink packet error rate DownLinkPER ( % ) can be calculated by the following formula:
  • ulRevPakNum is the number of correct loopback test packets received by the terminal from the base station
  • uSentPakNum is the number of loopback test packets sent by the terminal to the base station.
  • the method provided by the invention can conveniently and accurately measure the wireless transmission quality of the air interface, and can quickly obtain the throughput, PER and other indicators, and especially in the field start and wireless coverage test, the method can be quickly obtained. Test data, saving time and cost.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé pour mesurer une qualité de transmission de liaison descendante et de liaison ascendante entre une station de base et un terminal dans un système de communication sans fil utilisant une technique d'accès multiple OFDM. Ce procédé consiste à négocier un paramètre de test entre la station de base et le terminal. Ensuite, la station de base envoie un paquet de données de test au terminal, le terminal renvoie à la station de base un résultat reçu concernant le paquet de données de test, puis obtient par calcul une information concernant la qualité de transmission de la liaison descendante.
PCT/CN2004/001302 2004-11-15 2004-11-15 Procede pour mesurer la qualite d'une voie sans fil dans un systeme d'acces multiple ofdm Ceased WO2006050635A1 (fr)

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PCT/CN2004/001302 WO2006050635A1 (fr) 2004-11-15 2004-11-15 Procede pour mesurer la qualite d'une voie sans fil dans un systeme d'acces multiple ofdm
CN200480043666XA CN1993910B (zh) 2004-11-15 2004-11-15 正交频分复用多址接入系统无线信道质量的测量方法

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PCT/CN2004/001302 WO2006050635A1 (fr) 2004-11-15 2004-11-15 Procede pour mesurer la qualite d'une voie sans fil dans un systeme d'acces multiple ofdm

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WO2006050635A1 true WO2006050635A1 (fr) 2006-05-18

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CN102934369A (zh) * 2010-04-12 2013-02-13 Lg电子株式会社 在支持多天线的无线通信系统中的有效反馈的方法和设备

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CN102769516B (zh) * 2011-05-06 2017-08-11 中兴通讯股份有限公司 一种信道测量信息反馈方法及系统
CN103166701B (zh) * 2013-02-27 2015-09-30 华为技术有限公司 在光传输中参数协商的方法、发送设备、接收设备及光模块

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