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WO2008022598A1 - Procédé de test, terminal et dispositif côté réseau pour accès aléatoire - Google Patents

Procédé de test, terminal et dispositif côté réseau pour accès aléatoire Download PDF

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Publication number
WO2008022598A1
WO2008022598A1 PCT/CN2007/070506 CN2007070506W WO2008022598A1 WO 2008022598 A1 WO2008022598 A1 WO 2008022598A1 CN 2007070506 W CN2007070506 W CN 2007070506W WO 2008022598 A1 WO2008022598 A1 WO 2008022598A1
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WO
WIPO (PCT)
Prior art keywords
signature sequence
ofdm
random access
detecting
sequence
Prior art date
Application number
PCT/CN2007/070506
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English (en)
Chinese (zh)
Inventor
Bin Li
Wei Ruan
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008022598A1 publication Critical patent/WO2008022598A1/fr

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Classifications

    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a detection technique for random access in an OFDM-based system.
  • random access technology plays an important role in various wireless communication multiple access systems. The following is a brief description of the access control technology in the mobile communication system.
  • the terminal when a terminal moves in each neighboring cell, after entering a cell to complete location registration, the terminal resides in the cell and enters an idle state, which is also referred to as a current cell of the terminal. .
  • the idle state if the terminal performs the cell location update process, or needs to respond to the paging of the cell, or needs to establish a call with other terminals, including a service request, a short message request, etc., the terminal sends the message to the current cell base station. Access request.
  • the random access process is initiated by the terminal. The terminal sends an access request to the cell base station on the random access channel to perform access probe.
  • the network side When the network side receives the access request of the terminal, it allocates a message to the terminal back channel on a common channel, and then the terminal and the base station perform data interaction on the allocated specific channel. It should also be noted that the random access procedure initiated by the terminal is performed according to the access resources of the current cell base station and according to a specific algorithm. The terminal selects an access slot in the available access resources, and the selection is random. After receiving the access probe of the terminal, the base station sends an access indication message to the terminal, indicating whether the current terminal is connected. Successful. If the random access is unsuccessful, the terminal cannot perform data interaction with the current cell, and cannot complete the function of call or data transmission.
  • the random access channel usually consists of a random access prefix and a random access message. Random access
  • the function of the prefix is to implement uplink synchronization, carrying random identification numbers and other information.
  • the random access message part usually carries connection request information and the like.
  • the random access prefix is also called a random access probe.
  • the design of the random access prefix needs to consider the difficulty of capturing the prefix sequence by the base station, the complexity of the base station detection, the anti-interference performance, and the performance in different transmission environments.
  • the sender selects a signature sequence from the candidate signature sequences.
  • a 1024-bit Walsh code (Wash code) is used as the signature sequence.
  • the 1024-bit signature sequence is scrambled and then arranged into a matrix of 128 rows and 8 columns. Each column undergoes a 128-point Discrete Fourier Transform (“DFT”) transformation.
  • DFT Discrete Fourier Transform
  • the 128 data obtained after the transformation is mapped to consecutive 128 subcarriers of an Orthogonal Frequency Division Multiplexing (OFDM) system, and then subjected to OFDM modulation, for example, by 512-point inverse fast Fourier transform ( Inverse Fast Fourier Transform ("IFFT") is transformed, and the cyclic prefix is sent as a random access prefix through the antenna.
  • OFDM Orthogonal Frequency Division Multiplexing
  • IFFT Inverse Fast Fourier Transform
  • 802.20 a physical frame is included. 8 OFDM symbols, so the transmission of the random access prefix occupies 128 subcarriers on one physical frame.
  • the design of receiving the random access prefix at the receiving end is as shown in FIG. 2, firstly, the signal received by the antenna is demodulated by OFDM, for example, after circling and embedding, performing 512-point Fast Fourier Transform ("FFT" for short). Then, the prefix data is extracted from the corresponding 128 subcarriers at the time of transmission, and a column is formed, and 8 columns of data are extracted, and 128 points of Inverse Discrete Fourier Transform (IDFT) are obtained, respectively, and 128 are obtained respectively. Demodulated signature sequence data.
  • FFT Fast Fourier Transform
  • the demodulated signature sequence data of eight columns of 128 elements is rearranged and restored into a sequence of scrambled 1024 elements, which is subjected to descrambling and correlation detection of a 1024-bit Walsh code to obtain a detection signal. Determining whether to capture the prefix according to whether the detection signal exceeds the threshold. If the detection signal exceeds the threshold, it is considered to capture the prefix, and the base station as the receiving end sends the acknowledgement information to the terminal as the transmitting end on the downlink channel, if the detection signal is not exceeded. The value is considered to be not captured.
  • the base station Since the terminal does not implement uplink synchronization when transmitting the prefix sequence, the base station needs to perform timing shift on the signal received by the antenna, and then perform correlation detection after OFDM demodulation or the like.
  • the calculation amount at the receiving end is very large, and the receiving structure is complicated. Since the random access prefix is transmitted only on 128 subcarriers of all 512 OFDM subcarriers, and the uplink sequence is not implemented when the prefix sequence is transmitted, the timing information is unknown, and therefore, the receiving end is performing time synchronization. At this time, it is necessary to re-execute 512-point FFT operation, 128-point IDFT operation and Walsh code correlation operation for each newly received signal sample point, which results in a huge computational amount at the receiving end, and has to have extremely complicated reception. Machine structure.
  • the present invention provides a method for detecting random access, a terminal, and a network side device, so that the calculation amount when the network side detects random access is greatly reduced, and the related device is simplified.
  • the present invention provides a method for detecting random access in an OFDM-based system, which includes the following steps:
  • the terminal transmits the signature sequence in the entire frequency band by using OFDM
  • the signature sequence is detected in the time domain.
  • the present invention also provides a method for detecting random access in an OFDM-based system, comprising: removing the received signal from a cyclic prefix and detecting the signature sequence in a time domain.
  • the invention also provides an OFDM-based terminal, comprising:
  • a unit that transmits the OFDM signal in a full frequency band A unit that transmits the OFDM signal in a full frequency band.
  • the present invention also provides an OFDM-based network side device, including: a unit that receives an OFDM signal;
  • the unit of the signature sequence is detected in the time domain for the signal from which the cyclic prefix is removed.
  • the main difference between the technical solution of the present invention and the prior art is that it is possible to detect a signature sequence in the time domain by transmitting an OFDM signal containing a signature sequence in the entire frequency band. Since the correlation operation is not required for all possible timing sequences for all possible timing shifts, the detection in the time domain greatly reduces the amount of computation on the network side.
  • All-band transmission means that all subcarriers are used to transmit a prefix containing a signature sequence.
  • the signature sequence can be mapped to all subcarriers, or only to a part of subcarriers, and other subcarriers do not carry data.
  • the present invention can complete the transmission of the signature sequence with fewer symbols than the prior art, and the signature sequence can be obtained with a lower moving speed of the terminal. Better detection results.
  • the signature sequence can be sent on consecutive subcarriers and detected by direct time domain correlation, which facilitates direct acquisition of the signature sequence and timing correction information.
  • the signature sequence can also be transmitted on equally spaced subcarriers and detected by time domain differential correlation.
  • the time domain differential correlation method can detect whether there is a prefix with a smaller amount of calculation, and further identify a specific signature sequence only when there is a prefix, so that the terminal access is not frequent. In the case, the total amount of computation associated with random access detection is small.
  • the reserved guard time can prevent the random access prefix from interfering with the traffic channel and ensure the performance of the traffic channel.
  • FIG. 1 is a schematic diagram of a terminal transmitting a random access prefix according to the prior art
  • FIG. 2 is a schematic diagram of receiving a random access prefix by a network side according to the prior art
  • 3 is a flowchart of a method for detecting random access in an OFDM-based system according to a first embodiment of the present invention
  • 4 is a schematic diagram of a terminal transmitting a random access prefix in a method for detecting random access in an OFDM-based system according to a first embodiment of the present invention
  • FIG. 5 is a schematic diagram of a network side receiving a random access prefix in a method for detecting random access in an OFDM-based system according to a first embodiment of the present invention
  • FIG. 6 is a flowchart of a method for detecting random access in an OFDM-based system according to a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a network side receiving a random access prefix in a method for detecting random access in an OFDM-based system according to a second embodiment of the present invention.
  • the terminal maps the generated signature sequence to consecutive subcarriers, or maps to a part of the subcarriers at equal intervals, and the other subcarriers do not carry data, and the OFDM signal containing the signature sequence is transmitted in the entire frequency band, so that The receiving end can detect the signature sequence in a direct time domain correlation manner or in a time domain differential correlation manner, thereby avoiding performing related operations on all possible signature sequences for all possible timing shifts, thereby greatly reducing the calculation amount on the network side. .
  • the terminal in step 301, the terminal generates a signature sequence. Specifically, the terminal generates a signature sequence of length m*N 2 bits, that is, the signature sequence is composed of sub-sequences of length m of ⁇ 2 .
  • m is an integer greater than or equal to 1
  • ⁇ is the number of subcarriers available in each OFDM symbol of the OFDM system, the number of subcarriers being less than or equal to the total number of subcarriers included in each OFDM symbol of the OFDM system.
  • Each of the sub-sequences constituting the signature sequence includes: a GCL sequence, a Walsh code or a DFT-transformed Walsh code, a PN sequence, or a DFT-transformed PN sequence.
  • the subsequences constituting the same signature sequence may be the same or different, for example, a GCL sequence repeated by two columns in the same signature sequence.
  • the terminal maps the signature sequence to consecutive subcarriers and transmits the OFDM method in the entire frequency band.
  • the signature sequence generated by the terminal and having a length of m*N 2 bits may be arranged into an array of N 2 rows and m columns, and each of the columns is mapped to all of the OFDM symbols.
  • the m columns are mapped to m consecutive OFDM symbols, which are transmitted through the antenna after OFDM modulation, as shown in FIG.
  • the signature sequence is transmitted by using all available subcarriers in the OFDM symbol. Therefore, the signature sequence is transmitted in only part of the frequency band in the prior art, and the signature sequence can be completed with fewer symbols in this embodiment. The transmission can still obtain better detection results when the terminal moves at a higher speed.
  • the network side removes the cyclic prefix from the received signal, and performs a detection signature sequence in a direct time domain correlation manner, as shown in FIG. 5. Specifically, since the terminal transmits the generated signature sequence through all available subcarriers in the OFDM symbol, even if the number of subcarriers available in each OFDM symbol is smaller than the total number of subcarriers included in each OFDM symbol of the OFDM system The signature sequence as a random access prefix still occupies the entire frequency band. Therefore, the network side can detect the received signal by using the direct time domain correlation method after removing the cyclic prefix, and does not need to perform related operations on all candidate signature sequences for all possible timing shifts, thereby greatly reducing The amount of calculation on the network side.
  • the network side determines whether a random access prefix is captured. Specifically, the network side determines whether a random access prefix is captured based on the result of detecting the signature sequence in the time domain, and if yes, proceeds to step 305, otherwise, the flow ends.
  • the network side acquires the corresponding signature sequence number and timing correction information. Specifically, if the network side determines that a random access prefix is captured based on the result of detecting the signature sequence in the time domain, the corresponding signature sequence number and timing correction information are obtained. Since the terminal transmits the signature sequence ⁇
  • FIG. 6 A method for detecting random access in a system based on OFDM according to a second embodiment of the present invention is shown in FIG. 6.
  • the terminal In step 601, the terminal generates a signature sequence. Specifically, the terminal generates a signature sequence of length m*(N 2 /2) bits, that is, the signature sequence is composed of sub-sequences of length m segments. Where m is an integer greater than or equal to 1, and N 2 is the number of subcarriers available in each OFDM symbol of the OFDM system, the number of subcarriers being less than or equal to the total number of subcarriers included in each OFDM symbol of the OFDM system.
  • Each of the sub-sequences constituting the signature sequence includes: a GCL sequence, a Walsh code or a DFT-transformed Walsh code, a PN sequence, or a DFT-transformed PN sequence.
  • the subsequences constituting the same signature sequence may be the same or different, for example, a GCL sequence repeated by two columns in the same signature sequence.
  • the terminal maps the signature sequence to equally available subcarriers, and transmits the OFDM in the full frequency band.
  • the signature sequence generated by the terminal with the length m*N 2 /2 bits may be arranged into an array of N 2 /2 rows and m columns, and each of the columns is respectively mapped to an equally spaced available subcarrier of one OFDM symbol. On, for example, only on odd or only on even available subcarriers, the other available subcarriers that are mapped to do not carry data. And mapping the m columns to m consecutive OFDM symbols to generate two identical signals in the time domain so that the network side performs simple correlation processing on the time domain to obtain timing synchronization.
  • m is still related to the moving speed of the terminal. The higher the speed of the terminal moves, the smaller the value of the selected m is. For example, for a system with 5M bandwidth and 512 subcarriers, if m is less than or equal to 4, that is, transmission of the signature sequence is completed by 4 or less OFDM symbols, good performance can be obtained even at a speed of 300 km/h. .
  • a signature sequence having a length of m*N 2 /2 bits is taken as an example.
  • the length of the subsequence in the signature sequence may be set to fewer bits.
  • Each of the subsequences is mapped to equally spaced available subcarriers of one OFDM symbol, such as 3 subcarriers.
  • the network detects the signature sequence by means of time-domain differential correlation, as shown in FIG. 7. Specifically, the network side separately samples the first half and the second half of the time domain signal for each OFDM time domain signal, and then performs correlation detection on the two signals, and accumulates the detection energy on the m OFDM symbols to generate Differential detection. Since the terminal maps the signature sequence to the equally available available subcarriers, the other available subcarriers that are mapped do not carry data. Therefore, even if the number of subcarriers available in each OFDM symbol is smaller than the total number of subcarriers included in each OFDM symbol of the OFDM system, the signature sequence as a random access prefix still occupies the entire frequency band. Place Therefore, the network side does not need to perform related operations on all candidate signature sequences for all possible timing shifts, which greatly reduces the amount of computation on the network side.
  • the network side decides whether a random access prefix is captured. Specifically, the network side determines whether a random access prefix is captured based on the result of detecting the signature sequence in the time domain, and if yes, proceeds to step 605; otherwise, the flow ends.
  • step 605 the network side acquires corresponding timing correction information. Specifically, if the network side determines that a random access prefix is captured based on the result of detecting the signature sequence in the time domain, the corresponding timing correction information is acquired.
  • the network side recognizes the signature sequence. Specifically, the network side corrects the received signal after the cyclic prefix is removed based on the acquired timing correction information, thereby identifying the signature sequence, as shown in FIG.
  • the candidate signature sequence and the received signal correlation may be used to detect whether the output energy exceeds the threshold value to identify the signature sequence; or a specific detector may be selected according to the characteristics of the signature sequence, such as Walsh sequence detection by Hadmar transform
  • the GCL sequence is detected by a differential coding-reverse complex leaf transform method to identify the signature sequence.
  • the network side can detect whether there is a prefix with a smaller computation amount in a time domain differential correlation manner, and further identify only when there is a prefix. A specific signature sequence is generated, so that the total amount of computation associated with random access detection is small in the case where the terminal access is not frequent.
  • the method for detecting random access in the OFDM-based system reserves the OFDM symbol as the guard time and does not carry the service data.
  • the random access prefix is designed. Contiguous OFDM symbols, M 2 ⁇ + 1.
  • the signature sequence is transmitted with consecutive delays ⁇ symbols in consecutive OFDM symbols, that is, within [ , + ⁇ - 1] symbols, where ⁇ is an integer greater than or equal to 0, + ⁇ - 1 ⁇ ⁇ 2 - 1 , the last OFDM symbol that does not carry the signature sequence is reserved as the guard time and does not carry data.
  • a fourth embodiment of the present invention is directed to an OFDM-based terminal, including a unit for generating a signature sequence, a unit for modulating the generated signature sequence into an OFDM signal, and a unit for transmitting an OFDM signal in the entire frequency band.
  • the unit that modulates the generated signature sequence into an OFDM signal maps the signature sequence on consecutive subcarriers, or maps the signature sequence on equally spaced subcarriers, and the remaining subcarriers are filled with 0, and the actual bearer signature is actually carried.
  • the number of subcarriers in the sequence is less than or equal to the number of subcarriers in the full band.
  • the signature sequence is transmitted in consecutive OFDM symbols by the unit that transmits the OFDM signal in the full frequency band, and the number of OFDM symbols of the actual transmission signature sequence is smaller than the number N of consecutive OFDM symbols allocated by the system to the random access channel, and the signature is not carried.
  • the OFDM symbols of the sequence do not carry data.
  • the signature sequence uses a random delay ⁇ symbols, which are transmitted in the [ ⁇ , ⁇ + ⁇ -l] symbol, ⁇ is an integer greater than or equal to 0, and ⁇ + ⁇ -1 ⁇ -1.
  • the OFDM signal containing the signature sequence By transmitting the OFDM signal containing the signature sequence in the full frequency band, it is possible to detect the signature sequence in the time domain, so that the network side does not need to perform related operations on all candidate timing sequences for all possible timing shifts when detecting random access. , greatly reducing the amount of calculations and simplifying related equipment. Moreover, by using the reserved guard time, the interference of the random access prefix on the traffic channel can be prevented, and the performance of the traffic channel can be ensured, and the random delay is also beneficial to reduce the chance of the random access prefix detection colliding with each other.
  • a fifth embodiment of the present invention is directed to an OFDM-based network side device, comprising: a unit for receiving an OFDM signal, a unit for removing a received signal from a cyclic prefix, and a unit for detecting a signature sequence for a signal for removing a cyclic prefix in a time domain, And according to the result of detecting the signature sequence in the time domain, it is determined whether a random access prefix is captured, and if it is determined that a random access prefix is captured, the corresponding unit of the signature sequence number and the timing correction information is output.
  • the unit for detecting the signature sequence in the time domain for the signal with the cyclic prefix removed detects the signature sequence by direct time domain correlation.
  • the network side device detects the signature sequence by direct time domain correlation, which can greatly reduce the calculation amount when detecting random access, and is convenient for directly obtaining the signature sequence and the timing correction information.
  • a sixth embodiment of the present invention is a network side device based on OFDM, comprising: a unit for receiving an OFDM signal, a unit for removing a received signal from a cyclic prefix, and a unit for detecting a signature sequence for a signal for removing a cyclic prefix in a time domain, According to the result of detecting the signature sequence in the time domain, it is determined whether a random access prefix is captured, and if it is determined that a random access prefix is captured, a corresponding timing correction information is output. And correcting the signal after removing the cyclic prefix according to the timing correction information and identifying the signature sequence

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

Abstract

Dans le domaine des communications sans fil, un procédé de test, un terminal et un dispositif côté réseau pour un accès aléatoire sont décrits, lesquels sont utilisés pour réduire considérablement la quantité de calcul lorsque le dispositif côté réseau teste l'accès aléatoire et pour simplifier les dispositifs pertinents. Selon le procédé décrit dans cette invention, grâce à la transmission d'un signal OFDM contenant une séquence de signature dans la bande de fréquence complète, il est possible de tester la séquence de signature dans le domaine temporel. La séquence de signature peut être transmise sur les sous-porteuses en série, puis elle est testée selon une relation temps-domaine directe. La séquence de signature peut également être transmise sur les sous-porteuses à intervalle égal, puis elle est testée selon une relation différentielle temps-domaine. Un symbole OFDM ultérieur peut être utilisé pour un temps de protection présélectionné et sans transport de données, après la fin de la transmission des symboles OFDM transportant la séquence de signature.
PCT/CN2007/070506 2006-08-18 2007-08-17 Procédé de test, terminal et dispositif côté réseau pour accès aléatoire WO2008022598A1 (fr)

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CN200610115131XA CN101128004B (zh) 2006-08-18 2006-08-18 随机接入的检测方法、终端及网络侧设备
CN200610115131.X 2006-08-18

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CN104053244B (zh) * 2013-03-12 2018-11-23 普天信息技术研究院有限公司 一种随机接入方法
CN106817707B (zh) * 2015-11-30 2021-02-23 上海诺基亚贝尔股份有限公司 在基站中用于检测以及辅助检测信号来源的方法及装置
CN110943820B (zh) * 2016-08-12 2023-11-10 华为技术有限公司 信号发送装置、信号检测装置及方法
CN107888528B (zh) * 2016-09-29 2020-06-02 电信科学技术研究院 一种数据发送方法、接收方法及装置
CN111225438B (zh) * 2019-03-26 2021-02-02 西安电子科技大学 随机接入前导检测方法、装置、计算机设备及存储介质

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