WO2012130087A1 - 无线通信系统及其通信方法 - Google Patents
无线通信系统及其通信方法 Download PDFInfo
- Publication number
- WO2012130087A1 WO2012130087A1 PCT/CN2012/072870 CN2012072870W WO2012130087A1 WO 2012130087 A1 WO2012130087 A1 WO 2012130087A1 CN 2012072870 W CN2012072870 W CN 2012072870W WO 2012130087 A1 WO2012130087 A1 WO 2012130087A1
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- WIPO (PCT)
- Prior art keywords
- sequence
- cyclic shift
- random access
- length
- communication method
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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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- 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
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
-
- 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
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
-
- 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]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Definitions
- the present invention relates to the field of wireless communication and network technologies, and in particular to a wireless communication system and a communication method therefor. Background technique
- a conventional WLAN system such as the 802.11 series
- STAs all user terminals
- the CSMA/CA Carrier Sense Multiple Access with Collision Avoidance mechanism
- AP detected access point
- the advantage of this scheme is that it is easy to implement, and no separate design is needed on the physical layer.
- the disadvantage is that since the authentication request frame and the associated request frame are MAC frames, the length training symbols and control symbols, frame control information, etc. are also required. There are many OFDM symbols, so when the number of users is large, the increase of the collision probability will cause the system efficiency to decrease.
- LTE Long Term Evolution
- Wimax Worldwide Interoperability for Microwave Access
- the access sequence is used to assist in the process of random access, but since the two are oriented to the scene of mobile communication, the coverage is large (the coverage radius is in the range of several hundred meters to several tens of kilometers), and the random access sequence they use Not suitable for scenarios with medium to short range wireless communication.
- Figure 1 and Table 1 respectively show the random access sequence format and the specific parameters supported by the LTE system.
- the random access sequence includes the cyclic prefix CP and the sequence subject, and the sequence subject uses the short training sequence Zadoff-Chu sequence.
- the so-called CAZAC sequence is a non-binary complex sequence with excellent characteristics of constant amplitude and zero autocorrelation.
- the format 4 is only applicable to the case where the uplink pilot time slot (UpPTS) has a length of 4384 and 5120 in the TDD frame structure.
- UpPTS uplink pilot time slot
- this example uses 2 OFDM symbols as a random access sequence, and the specification specifies that the number of OFDM symbols that can be used is 2 or 4.
- the sequence body uses the PN sequence.
- Table 2 shows the different CP length values T CP supported by Wimax.
- the OFDM symbol length is 3.2 microseconds
- the cyclic prefix CP has a length T CP of 0.8 microseconds
- the subcarrier spacing is 312.5 kHz
- the corresponding useful subcarriers in the 20M bandwidth are corresponding.
- the number is 52
- the size of the Fast Fourier Transform FFT is 64. From the physical layer parameters, whether it is LTE or Wimax random access sequence, ⁇ can not be directly applied in the existing wireless office i or network system, it is necessary to redesign the random access sequence in 40 pairs. Summary of the invention
- the invention provides a wireless communication system and a communication method thereof, which can better support the random access of the wireless communication system and improve the stability and reliability of the system.
- a communication method of a wireless system provided by the present invention includes:
- N is the number of useful subcarriers
- the sequence performs constellation mapping and subcarrier mapping
- the sequence is orthogonally transformed, and then cyclically shifted based on the cyclic shift parameter ⁇ (5 es ⁇ to obtain a desired sequence;
- a wireless communication system provided by the present invention includes:
- the cyclic shift parameter selection unit determines the cyclic shift parameter set ⁇ 5cs ⁇ according to the system configuration information
- An acquiring unit configured to obtain a MAC address of a central access point CAP or a physical layer identifier ID thereof; a pseudo random sequence generating unit, configured to generate a MAC address of the CAP or a physical layer identifier thereof and a predetermined generator polynomial according to the CAP a PN sequence of length N;
- a constellation mapping unit configured to perform constellation mapping on the generated PN sequence, obtain a new sequence, and provide the new sequence to the subcarrier mapping unit;
- a carrier mapping unit configured to perform subcarrier mapping on the PN sequence
- a first cyclic shift processing unit based on the cyclic shift parameter ⁇ (5 CS ⁇ cyclically shifting the subcarrier mapped sequence; or a second cyclic shift processing unit, for using the orthogonal transformed sequence Performing a cyclic shift based on the cyclic shift parameter ⁇ (5 es ⁇ to obtain a desired sequence;
- a transform processing unit performing orthogonal transform on the subcarrier mapped sequence, and providing the sequence to the second cyclic shift processing unit; or performing orthogonal transform on the cyclically shifted sequence of the first cyclic shift processing unit, Obtain the desired sequence;
- An access signal generating unit configured to add a cyclic prefix CP to the obtained required sequence to obtain a random access signal in a time domain;
- a modulating unit configured to modulate the random access signal
- a sending unit configured to send the modulated random access signal to the receiving end.
- the wireless communication system and the communication method thereof provided by the present invention use the PN sequence and its cyclic shift sequence as random access sequences.
- random access sequences with 40 pairs of features, changes in sequence length, changes in cyclic shift parameters, changes in cyclic prefix length, etc., to better support wireless communication systems, especially for short- and medium-range wireless communication systems.
- the purpose of access is to improve the stability and reliability of the system.
- FIG. 1 is a schematic diagram of a random access sequence used in an LTE system in the prior art
- FIG. 2 is a schematic diagram of a random access sequence used in a Wimax system in the prior art
- FIG. 3 is a flowchart of a communication method of a wireless system according to the present invention.
- FIG. 5 is a block diagram of generating a PN sequence according to an embodiment of the present invention.
- FIG. 6 is a schematic diagram of subcarrier mapping used in an embodiment of the present invention.
- FIG. 7 is a system frame structure of a wireless communication system according to an embodiment of the present invention.
- FIG. 8 is a block diagram showing a PN sequence generation according to another embodiment of the present invention.
- FIG. 9 is a schematic structural diagram of a communication system provided in an embodiment of the present invention. detailed description
- the present invention provides a communication method, which involves random
- the design of the access sequence uses the PN sequence and its cyclic shift sequence as random access sequences.
- the length of the sequence changes, the cyclic shift parameter changes 4 ⁇ , the cyclic prefix length changes, etc., to achieve better support for wireless communication system random access purposes, It is better to support random access in short- and medium-range wireless communication systems.
- the access point in the following invention is referred to as a central access point (CAP), and the user terminal is referred to as a station (STA).
- CAP central access point
- STA station
- a communication method of a wireless system includes the following steps:
- N is the number of useful subcarriers; for example, the value of N may be - ⁇ , N, and the like.
- the cyclic shift parameter set ⁇ 5 CS ⁇ is determined according to the designed system coverage, and the specific steps include
- the cyclic prefix CP is determined according to the designed system coverage.
- the specific steps include:
- the Zadoff-Chu sequence plus cyclic shift is used as the access sequence, and the PN sequence is used as the access sequence in 802.16.
- the present invention uses the PN plus cyclic shift as the access sequence. The main reasons are as follows: 1) The system uplink data transmission does not consider precoding to reduce the peak-to-average ratio, so the Zadoff-Chu sequence is not used as the access sequence; 2) The cyclic shift can reduce the implementation complexity of the CAP terminal detection. Assuming a cyclic shift set ⁇ (5 es ⁇ has 8 elements, the complexity is reduced to 1/8 of the original; 3) If frequency domain detection is used, the PN sequence uses less logic than the Zadoff-Chu sequence. Resources. This can reduce the cost of the corresponding device.
- LTE Long Term Evolution
- S04 cyclically shifting the constellation mapping and the subcarrier mapped sequence, and performing orthogonal transform; for example, inverse fast Fourier transform IFFT, and other transform manners may also be used.
- orthogonal transform for example, inverse fast Fourier transform IFFT, and other transform manners may also be used.
- the cyclic shift can be performed in the frequency domain or in the time domain.
- the sequence of the constellation mapping and the subcarrier mapping is cyclically shifted based on the cyclic shift parameter ⁇ 5 es ⁇ , and the cyclically shifted sequence is orthogonally transformed to obtain a desired sequence; specifically, Use the inverse fast Fourier transform IFFT (including positive and negative frequency shifting).
- the subcarrier-mapped sequence is orthogonally transformed (such as IFFT, including positive and negative frequency shifting). Converting, and then performing cyclic shift based on the cyclic shift parameter ⁇ (5 es ⁇ to obtain a desired sequence;
- the length of the IFFT is used.
- CS ⁇ ⁇ 0 43 86 129 172 215 ⁇ .
- the user terminal randomly selects or uses the sequence index and the cyclic shift index allocated by the CAP to generate a random access signal as a resource request signal.
- the random access signal is used as a resource request signal, and the difference between the two is: a sequence index when the random access signal is generated, and the cyclic shift index is randomly selected by each STA, and there is a possibility of conflict; and as a resource request signal
- the competitive resource request signal is generated with the random access signal; when the non-competitive resource request signal is generated, the sequence index and cyclic shift used by the STA
- the index is allocated by the CAP to each STA through the control channel, and there is no possibility of collision.
- the random access and resource requests can be distinguished in the form of time division or code division.
- the resource request and random access of the system are time-division in an uplink transmission frame, the resource request can use the same code resource as the random access. If the two are not time-division, they must be distinguished by using different code resources or cyclic shift parameters.
- the bandwidth of the physical channel is 20M, and the inverse fast Fourier transform IFFT is used.
- the communication method of the wireless system provided by this embodiment refers to FIG. 4, and the method includes the following steps:
- N ⁇ N U a random access sequence length
- N is the system configuration parameter, for example, its value can be configured as , , N .
- the 5102. Determine a MAC address of the CAP or a physical layer identifier ID of the CAP.
- the MAC address of the CAP is obtained by the broadcast information of the system, and the physical layer identifier ID of the CAP may be included in the system synchronization symbol.
- the cyclic shift parameter and the cyclic prefix length can work with the system. Scene changes.
- the working scenario mainly refers to the coverage of the system.
- the backhaul delay plus the channel delay extension is about 1.46 microseconds, so the CP length is set to 1.6 microseconds, considering the backhaul.
- the time-domain sample number corresponding to the delay plus channel delay extension is about 30, and the cyclic shift interval of the adjacent sequence should be greater than or equal to 30 samples.
- the initial state of the linear feedback register (LFSR) in Figure 5 is [0010101 10000000], and the pseudo-random binary sequence of the output is : Its period is 32767. Then the ith available random access sequence corresponding to the CAP is:
- T(k) M(k)e ' (2)
- ke[- ⁇ , ⁇ -l] 5 CS is a cyclic shift parameter.
- the cyclic prefix CP is added to obtain a random access signal in the time domain, and thus the baseband signal processing is completed.
- 5110 Perform subsequent processing on the random access signal, and send the signal to the receiving end.
- the random access sequence can also be used as a resource request sequence, which can be distinguished from the random access channel in the form of time division or code division.
- the resource request and random access of the system are time-division in an uplink transmission frame, so the resource request can use the same code resource as the random access.
- the random access sequence is generated in the time domain.
- the difference from the frequency domain implementation scheme described in the first embodiment is mainly that, in the frequency domain implementation scheme provided in the first embodiment, the cyclic shift is performed before the IFFT, which is equivalent to performing different phases on different subcarriers. Rotation; and the time domain implementation in this embodiment is performed after the IFFT, corresponding to the cyclic shift of the i or the sample.
- a generator polynomial different from Wimax is used, for example, a maximum length linear feedback shift register sequence with a generator polynomial of 1 + ; ⁇ + ;, and a block diagram of the PN sequence generation is shown in FIG.
- the initial state of the linear feedback register (LFSR) in Figure 8 is [001010110000000]
- the subsequent constellation mapping, subcarrier mapping, and IFFT transformation are basically the same as those in the first embodiment, and are not described herein again.
- the embodiment of the present invention provides a wireless communication system 300.
- the method includes: a setting unit 310, configured to determine a random access sequence length N according to system configuration information,
- N is a useful subcarrier
- the parameter selection unit 320 determines, according to the system configuration information, a cyclic shift parameter set ⁇ (5 CS ⁇ ; an obtaining unit 330, configured to acquire a MAC address of the access point CAP or a physical layer identifier ID thereof; the sequence generating unit 340 is configured to Generating a PN sequence of length N according to the MAC address of the CAP or its physical layer identification ID and a predetermined generator polynomial;
- the constellation mapping unit 350 is configured to perform constellation mapping on the generated PN sequence to obtain a new sequence, and provide the new sequence to the sequence processing unit for subcarrier mapping.
- a carrier mapping unit 360 configured to perform subcarrier mapping on the PN sequence
- the first cyclic shift processing unit 370A performs cyclic shift based on the cyclic shift parameter ⁇ (5 CS ⁇ on the subcarrier mapped sequence; or the second cyclic shift processing unit 370B is configured to perform orthogonal transform)
- the sequence is cyclically shifted based on the cyclic shift parameter ⁇ (5 es ⁇ to obtain a desired sequence;
- the transform processing unit 380 performs orthogonal transform (such as IFFT, including normal shift of positive and negative frequency) on the subcarrier mapped sequence of the carrier mapping unit 360, and provides the sequence to the second cyclic shift processing unit; or a cyclic shift processing unit performs cyclic transform on the sequence to perform orthogonal transform (such as IFFT, including positive and negative frequency shifting) to obtain a desired sequence;
- orthogonal transform such as IFFT, including normal shift of positive and negative frequency
- the access signal generating unit 390 is configured to add a cyclic prefix CP to the obtained required sequence to obtain a random access signal in the time domain;
- a modulating unit for modulating the random access signal
- a transmitting unit for transmitting the modulated random access signal to the receiving end.
- the wireless communication system and the communication method thereof provided by the present invention use a PN sequence and a cyclic shift sequence thereof as random access sequences.
- a PN sequence and a cyclic shift sequence thereof are designed as random access sequences.
- changes in sequence length, changes in cyclic shift parameters, changes in cyclic prefix length, etc. to better support the random access of wireless communication systems, especially better
- the ground supports medium-and short-range wireless communication systems for random access, improving system stability and reliability.
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CN201280012988.2A CN103430615B (zh) | 2011-03-25 | 2012-03-23 | 无线通信系统及其通信方法 |
US14/007,529 US9007887B2 (en) | 2011-03-25 | 2012-03-23 | Wireless communication system and communication method therefor |
DK12763215.6T DK2690920T3 (da) | 2011-03-25 | 2012-03-23 | Trådløst kommunikationssystem og kommunikationsfremgangsmåde dertil |
EP12763215.6A EP2690920B1 (en) | 2011-03-25 | 2012-03-23 | Wireless communication system and communication method therefor |
JP2014501418A JP5901086B2 (ja) | 2011-03-25 | 2012-03-23 | 無線通信システム及びその通信方法 |
KR1020137028185A KR101990487B1 (ko) | 2011-03-25 | 2012-03-23 | 무선통신시스템 및 통신방법 |
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EP (1) | EP2690920B1 (zh) |
JP (1) | JP5901086B2 (zh) |
KR (1) | KR101990487B1 (zh) |
CN (2) | CN103430615B (zh) |
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KR20140023327A (ko) | 2014-02-26 |
EP2690920A4 (en) | 2014-08-27 |
CN103430615B (zh) | 2016-11-02 |
JP5901086B2 (ja) | 2016-04-06 |
KR101990487B1 (ko) | 2019-06-18 |
CN103430615A (zh) | 2013-12-04 |
US20140022884A1 (en) | 2014-01-23 |
JP2014514820A (ja) | 2014-06-19 |
US9007887B2 (en) | 2015-04-14 |
DK2690920T3 (da) | 2020-04-14 |
EP2690920B1 (en) | 2020-01-22 |
CN102548018A (zh) | 2012-07-04 |
EP2690920A1 (en) | 2014-01-29 |
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