WO2002025965A1 - Procede de mise en reseau d'un systeme de communication mobile cellulaire et emetteur-recepteur sans fil associe - Google Patents

Procede de mise en reseau d'un systeme de communication mobile cellulaire et emetteur-recepteur sans fil associe Download PDF

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Publication number
WO2002025965A1
WO2002025965A1 PCT/CN2000/000288 CN0000288W WO0225965A1 WO 2002025965 A1 WO2002025965 A1 WO 2002025965A1 CN 0000288 W CN0000288 W CN 0000288W WO 0225965 A1 WO0225965 A1 WO 0225965A1
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WIPO (PCT)
Prior art keywords
spreading
code
different
communication system
mobile communication
Prior art date
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PCT/CN2000/000288
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English (en)
Chinese (zh)
Inventor
Yan Gao
Daoben Li
Original Assignee
Linkair Communications, Inc.
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Publication date
Application filed by Linkair Communications, Inc. filed Critical Linkair Communications, Inc.
Priority to PCT/CN2000/000288 priority Critical patent/WO2002025965A1/fr
Priority to CN00819808.XA priority patent/CN1243448C/zh
Priority to AU2000275037A priority patent/AU2000275037A1/en
Publication of WO2002025965A1 publication Critical patent/WO2002025965A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques

Definitions

  • the present invention relates to a spread spectrum and digital multiple access wireless communication technology, and in particular, to a method for networking a cellular wireless communication network applied in any wireless digital communication system containing code division multiple access (OTMA) and spread spectrum technology, and A wireless transceiver implementing the method.
  • OTMA code division multiple access
  • a wireless transceiver implementing the method.
  • CDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • each user has its own unique spread-spectrum address code for mutual identification.
  • the spreading address codes of users should be completely orthogonal or nearly completely orthogonal to each other.
  • the spreading address codes between users in different cells (or sectors) should be as different as possible. This requirement for orthogonality between different user signals is consistent for any multiple-access system of. It is required that the spreading address codes of users in different cells (or sectors) have as large a difference as possible, not only to facilitate identification of cells (or sectors) and users, but also to reduce neighboring cells (or sectors) ) Mutual interference between wireless users. Because in general, a user station (or base station) will receive signals from the base station (or user station) of the neighboring cell (or sector) in addition to the signal from the base station (or user station) of the cell (or sector). signal.
  • the forward channel design technique in IS-95 is to divide the frequency band into a number of 1.25 channels with z intervals, and one cell opens one channel.
  • the forward channel uses the Wa 1 s h function code as the address code to establish a code division channel.
  • Each base station uses a pair of orthogonal pseudorandom codes
  • the pilot channel sends a spread spectrum signal without data information, but contains the phase offset and frequency reference information of the pilot PN sequence.
  • the pilot channel is continuously transmitted and has a higher transmission level than other signals. After the mobile station uses the strongest pilot signal to complete synchronization with the nearest base station, it can know the relationship between the phase offset of the pilot PN sequence and the strength of the pilot signal.
  • the phase offset of the pilot PN sequence represents the CDMA channels.
  • the frequency allocation has been transformed into a pilot PN sequence offset planning problem.
  • a method of using a long pseudo-random sequence (Long PN Sequence) with different offsets as a user identification code although the orthogonality between all user signals in the same cell will not change, and Inter-signals can also be distinguished due to different offsets of longer pseudo-random codes.
  • Long PN Sequence Long PN Sequence
  • Inter-signals can also be distinguished due to different offsets of longer pseudo-random codes.
  • the correlation characteristics between the simple channel codes emphasized here include, besides the orthogonal characteristics between the channel codes, the offset correlation characteristics between the channel codes.
  • the secondary peak of the correlation function of the spreading code will be changed. If the system requires the performance of some secondary peak positions, especially the adjacent positions of the main peaks, do not change (equivalent to zero is the best), then the above method will not be able to ensure that the relevant secondary peaks remain unchanged.
  • wireless signals are transmitted due to the diversity of propagation paths and propagation.
  • the complexity of the conditions, and the distinction between multiple code division channels at a receiver '(or transmitter) end, depends not only on the orthogonality between the code division channels, but also on their offset correlation characteristics.
  • a patent (PCT / CNOO / 00028) entitled "A Spread Spectrum. Multiple Address Coding Method with Zero Correlation Window” mentions a CDMA scheme with zero correlation window.
  • a spread-spectrum multi-address code is disclosed.
  • the auto-correlation and cross-correlation functions of the newly generated spread spectrum multi-address code can form a "zero correlation window" near the origin, In the "window", multiple access interference (MAI) and intersymbol interference (ISI) are zero. Therefore, the code division channel codes selected within a cell have unique correlation characteristics with each other. The correlation characteristics between channel codes not only have complete orthogonality, but their offset correlation characteristics are also fixed within a certain offset interval (0); therefore, the code division multiple access scheme is very suitable for applications with multiple Path effect in wireless communication systems.
  • MAI multiple access interference
  • ISI intersymbol interference
  • the object of the present invention is to provide a method for networking a cellular wireless communication system using code division multiple access and spread spectrum technology.
  • An object of the present invention is to provide a method for networking a cellular wireless communication system using code division multiple access and spread spectrum technology.
  • the zero correlation window characteristic of a multi-address code with zero correlation window may not be destroyed in the network.
  • a method for networking a CDMA cellular mobile communication system is provided.
  • the core of the method is that, on the time axis, spreading symbols within a subframe are separated by a zero-element string phase interval.
  • the sum length (that is, the sum of lengths) of a spreading symbol and a corresponding zero-element string are different and different, and different sub-frames are allocated within the subframes of different neighboring cells / sectors. Equal and different and length permutations.
  • a wireless transceiver for implementing the above networking method.
  • the wireless transceiver may be a base station or a mobile station of a cellular wireless mobile communication system, and at least includes a modulation and spreading module for transmitting. Data is subjected to modulation and spreading; a despreading and demodulation module is configured to perform despreading and demodulation on the received data; further including a dynamic spreading code generator for generating a spreading code and providing the modulation and spreading The module and the despreading and demodulation module, and according to the framing information of the cell / sector in which it is located, the spreading symbols inside the subframe are spaced apart by a zero element string specified by the framing information.
  • the invention provides a simple and easy-to-implement networking method for a cellular wireless mobile communication system, which can greatly reduce the interference level between adjacent cells / sectors compared with the existing system.
  • the invention not only solves the networking scheme of the multi-cell system, but also maintains the zero correlation window characteristic of the spread-spectrum multiple-access code in the same cell. Because the characteristics of the zero correlation window are maintained, the user coverage area and the number of users of the CDMA system are increased. With the above parameters, The increase will greatly reduce the unit area of the system and the actual cost of the unit user; increasing the utilization of wireless spectrum resources will also increase the total capacity of the CDMA system, thereby achieving a large-capacity, large-coverage wireless communication system.
  • Another advantage of the present invention is that using the present invention, the base station wireless transceiver and the mobile station wireless transceiver can be designed with the same technology, thereby greatly simplifying the base station wireless transceiver and the mobile station wireless transceiver. Hardware and software requirements.
  • Figure 1 shows a block diagram of a cellular network
  • Fig. 2 shows a preferred embodiment of the wireless transceiver of the present invention
  • Fig. 3 shows a physical layer frame structure using the networking method of the present invention
  • Fig. 4 shows the networking method according to the present invention
  • the lengths of the zero element strings inserted in different subframe structures within the cell In a preferred embodiment, the lengths of the zero element strings inserted in different subframe structures within the cell;
  • Fig. 5 shows a typical topological structure model of a 7-cell wireless communication cellular network
  • Fig. 6 shows a symbol characteristic evaluation diagram of the LA method between two cells
  • Figure 7 shows a 16-cell subframe construction scheme with a zero-element insertion arrangement.
  • FIG. 8 shows the period and minimum interval of a 16-pulse LA code.
  • FIG. 1 shows a block diagram of a cellular network. Please refer to FIG. 1.
  • the main implementation steps of this method are as follows: In the network activation or update phase, the mobile service switching center MSC will send a specific subframe allocation scheme to the base station controller BSC according to the parameters such as traffic volume and service type, and the base station sends and receives messages.
  • the spreading code generator in the BS will perform corresponding transformation according to the framing parameters sent by the base station controller BSC.
  • the mobile transceiver MS When a mobile user performs access or handover, the mobile transceiver MS obtains the corresponding dynamic framing information from the public control information sent by the base station transceiver BS, and applies these parameters to its own transmitter and receiver internal
  • the spreading code generator realizes corresponding communication services.
  • FIG. 2 shows a preferred embodiment of the wireless transceiver of the present invention. Please refer to FIG. 2.
  • the receiving antenna 103 couples the high-frequency modulation signal through the coupler 104, completes down-conversion in the carrier frequency unit 106, and the dynamic spreading code generator 110 receives according to the common control channel.
  • the framing control information of the module 109 performs demodulation and despreading on the information output by the carrier frequency unit 106 in the demodulation and despreading device 108, and then outputs data.
  • the dynamic spreading code generator 110 receives the module 109 according to the common control channel.
  • the framing control information is used to modulate and spread the input data in the modulation and spreader 107, and then becomes a radio frequency signal through the carrier frequency unit 105, and is transmitted by the transmitting antenna 102 after passing through the coupler 1 to Q4.
  • the main frequency generator 1 00 provides the carrier frequency unit 1 05, 106 through the clock single without 01 01 and provides a standard clock for the entire transceiver.
  • the common control channel receiving module 109 receives the public signal from the back end of the carrier frequency unit 106. Control channel information and provide this information to the dynamic spreading code generator 110.
  • the dynamic spreading code generator 110 is used to dynamically allocate cells (or sectors). The internal structure of the subframe to complete the communication between different cells.
  • the dynamic spreading code generator 110 obtains the framing information (including the allocation information of the spreading code) from the common control channel receiving module 109.
  • the core of a CDMA cellular mobile communication system according to the present invention lies in that on the time axis, spreading symbols within a subframe are separated by a string of zero elements, and each spreading symbol is associated with the spreading symbol.
  • the sum of the lengths of the corresponding zero-element strings that is, the sum of lengths
  • are different ones of the different unequal and different sums are allocated. arrangement.
  • the so-called zero element string corresponding to the spreading symbol can be defined as a zero element string immediately following the spreading symbol, or a zero element string preceding the spreading symbol, or it can be defined as being located at A part of the zero element string before the spreading symbol plus a part of the zero element string immediately following the spreading symbol should meet the uniform definition of "corresponding zero element string" in the cellular mobile communication system.
  • the so-called "sum length” refers to the sum of the lengths of the spreading symbols and the corresponding zero-element strings.
  • the unequal and different sum lengths satisfy: only one sum length is any odd number greater than the minimum sum length, and the remaining sum lengths are even numbers, and any one sum length is not equal to the other two or more And the sum of length.
  • the spreading symbols described in the subframe are spread by an LS code (the LS code will be described in detail later).
  • the subframes of different cells / sectors have the same and fixed subframe length.
  • the lengths of the spreading symbols inside the subframe are the same and fixed.
  • the present invention implements a new cellular mobile communication network networking method by reconstructing the frame structure on the physical layer, especially the subframe structure.
  • the present invention completely changes the sub-frame structure and allocates different sub-frame structures for different cells / sectors to achieve the purpose of distinguishing different neighboring cells / sectors.
  • the present invention performs cell networking by changing the arrangement of the intervals between spreading symbols within a subframe. For example, by using a reasonable arrangement of inserting unequal length zero element strings between spreading symbols in each cell signal, the probability of complete collision of symbols between signal code groups in different cells is reduced, that is, adjacent cell interference CI is reduced).
  • it can be implemented by changing the interval arrangement between the spreading symbols inside the sub-frame while keeping the sub-frame length unchanged.
  • the length of the spreading symbol and the zero-element string may be a fixed-length spreading code.
  • the length of the spreading symbol and the zero-element string may also be the sum of the lengths of the spreading codes of different lengths (such as LS codes) and the lengths of the zero-element strings of different lengths.
  • LS codes long-term evolution codes
  • an expansion method is disclosed. A method for encoding a multiple-access multiple-frequency code. This spreading code has good auto-correlation and cross-correlation characteristics. For clarity, in the description of the present invention, this type of spreading code is simply referred to as an LA code.
  • the LA code is composed of polarized basic pulses with a normalized amplitude and width of 1.
  • the number of basic pulses is based on the number of users required, the number of pulse compression codes that can be used, and the number of available pulse compression codes.
  • the actual factors such as the number of orthogonal pulse compression codes, the number of orthogonal frequencies that can be used, the system bandwidth, and the maximum signal transmission rate of the system are determined.
  • the intervals of the basic pulses on the time coordinate are different and different. Equal and different pulse position and pulse polarity arrangement coding.
  • the characteristics of this LA code are: First: the main peaks of the autocorrelation function are equal to the number of basic pulses, which is also equal to the number of orthogonal codewords in the code group; ,-1 and Q are three possible values.
  • the LA code can be used to identify different cells.
  • the sum of the lengths of each spreading symbol and a corresponding zero-element string can be obtained by an LA code. That is, the sum length uses the width of each interval of the basic code of the LA code.
  • an expansion with zero correlation window is disclosed.
  • Frequency multi-address code is called LS code. Because LS code is composed of C code and S code, it is also called CS code. The method of generating LS code (CS code) is described in detail in PCT / CN00 / 00028.
  • the designed spread-spectrum multi-address code with "zero correlation window” has the following two characteristics: First: each spread-spectrum The autocorrelation function of the address code is zero everywhere except the origin, that is, it has the most ideal characteristics. From the perspective of orthogonality, each spreading address code is completely orthogonal to any non-zero delay except for the zero delay. Second: The cross-correlation function between the spreading address codes has a "zero correlation window" near the origin. From the perspective of orthogonality, the spreading address codes are completely orthogonal when the relative delay is smaller than the width of the "zero correlation window".
  • each sub-frame of SF1, SF2, ... SFK is composed of m symbols extended by a spreading code, shown by CS, and a zero element string after each symbol.
  • the positions of the marked letters A, B, C, D, E, F, G, H, I, J, K, L, M, N, 0, P represent the insertion of zero elements
  • each letter represents the length of the inserted zero element string. In the future description, it is indicated that the length of the zero element string at the position A is n.
  • FIG. 4 shows a length of a zero-element string inserted in different subframe structures in a cell according to a preferred embodiment of the networking method according to the present invention.
  • the two tables respectively represent the lengths of the zero element strings inserted in different subframe structures in the two cells at the positions where zero elements need to be inserted.
  • the length of the zero-element string inserted in the subframe of cell A is: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 1;
  • the length of the frame inserting zero element string is: 2, 6, 10, 14, 18, 22, 26, 1, 0, 4, 8, 12, 16, 20, 24, 28;
  • the sub-frame of cell C inserts zero elements
  • the length of the string is another arrangement different from the cells A and B, and is omitted here.
  • the length of the zero-element string in the subframe can be either an odd number or an even number. In the above-mentioned special embodiment, only one of the lengths of the zero element strings of each type of cell subframe is an odd length, and the other are even lengths. However, the method of the present invention also includes any combination of other odd and even lengths.
  • the present invention can be implemented as follows:
  • FIG. 8 shows the period and minimum interval of a 16-pulse LA code.
  • each codeword is composed of 16 basic pulses, and the interval between each basic pulse is: 136, 138, 140, 142, 144, 146, 148, 150, 152, 154 , 156, 160, 162, 164, 137.
  • different cells are distinguished by changing the arrangement order of the pulse interval of the codeword, that is, for a codeword with the same polarity, by changing its pulse Different arrangement of intervals to identify different cells (or sectors).
  • the CS code can be used to increase the duty cycle.
  • the CS code is used to spread the symbols within the subframe.
  • the CS codes used in one subframe may be the same CS code or different CS codes.
  • the lengths between the CS codes may be the same or different. In this embodiment, the lengths of the selected CS codes are the same. In this embodiment, a CS code of the same length is used as the spreading code, and its length is 136.
  • the frame structure can use the same frame structure as IS-95, that is, the frame length is 20ms, and the bandwidth is 1.2288MHz.
  • each frame is composed of 10 subframes, which are SFO, SF1, SF2, ... SF9. Among them, the length of each subframe of SF1, SF2, ... SF9 remains unchanged.
  • Code 1 is taken as an example, and it is filled with the above-mentioned CS code to increase the occupation ratio. Air ratio.
  • a CS code with a length of 136 is used for padding.
  • the LA symbol interval is the same as the CS symbol interval, and both are in units of T c .
  • the pulse interval of the LA code it can be achieved by inserting a zero element string after the symbol extended by the CS code. For example, when the pulse interval is 136, 0 zeros are inserted, when the pulse interval is 138, 2 zero element strings are inserted, and when the pulse interval is 140, 4 zero element strings are inserted, and so on analogy.
  • different arrangement of the pulse intervals can be achieved by inserting different zero element strings after the symbols extended by the CS code.
  • an interval arrangement between the spreading symbols in the subframe such as inserting a zero element string of this length after the 16 symbols extended by the CS code, 0, 2, 4, 6, 8 , 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 1, at this time, a spaced arrangement shown in No. 1 in FIG. 7 is obtained, and this arrangement can be used
  • a spaced arrangement shown in No. 1 in FIG. 7 is obtained, and this arrangement can be used
  • an interval arrangement shown in No. 2 in FIG. 7 is obtained, and this arrangement can be used for the identification of the B cell.
  • any other set of data in FIG. 7 can be applied to the subframe construction method in other cells to achieve the difference between the base station signal and the mobile user signal between each cell.
  • the code length of the basic CS code listed in FIG. 7 is 136, which can be applied to the data in the subframe arrangement of 16 different cells (or sectors), respectively.
  • the first row example is 136, 138, respectively. 140,... 137, which indicates that the number of zero element strings inserted after each symbol extended by the CS code is 0, 2, 4, ... ... 1.
  • Each row can be used in a cell (or sector).
  • a total of 16 sets of data are listed in the table. This is a preferred embodiment of the present invention. It is characterized in that each column of the data in the table is different, that is, zeros are inserted at the same position in the subframe of each cell (or sector). The number of element strings is different.
  • any 7 different groups of data can be selected in the attached table and applied to the sub-frames within each cell.
  • the difference between the base station signal and the mobile user signal between the cells is realized.
  • adjacent cell interference ACI
  • the change of the basic pulse interval of the LA code basically does not affect the correlation characteristics of the CS code in the same cell (or sector)
  • the correlation sub-peaks of the CS code in different cells (or sectors) are also relatively small, which is effective.
  • the networking method can be simple and easy to implement. From the simulation curve, refer to FIG. 6, which is a symbol characteristic of the LA method between NO. 1 and NO 0.2 cells. Evaluation (subframe zero offset).
  • FIG. 6 is a symbol characteristic of the LA method between NO. 1 and NO 0.2 cells. Evaluation (subframe zero offset).
  • the beneficial effects of the cell networking scheme of the present invention are known.
  • This figure describes the use of two sets of LA arrangement data in No. 1 and No. 2 in FIG. 7 for Cell A and Cell B, respectively.
  • Use CS code 8 CS code 1 and CS code 8 are a pair of equal-length orthogonal code groups generated according to the "spreading address code method with zero correlation window".
  • the abscissa represents the 16 expanded symbols in a subframe at the 16 output moments of the relevant receiver.
  • the target represents the output value at the output moment of the relevant receiver, and this value reflects the interference of the interference users in cell B to the users in cell A under investigation.
  • the neighboring cell interference of the two cells is very small. This also illustrates the beneficial effects of the networking method of the present invention. It is obvious and understood by those skilled in the art that the above-mentioned embodiments are only used to illustrate the present invention, but not intended to limit the present invention. The present invention can be modified and improved in many ways, and in addition to the specific preferred methods given above, the present invention can also have many other embodiments. Therefore, any method or improvement that can be obtained according to the concept of the present invention should be included in the scope of rights of the present invention.

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

Abstract

L'invention concerne un procédé de mise en réseau d'un système de communication mobile cellulaire à accès multiple à répartition par code et un émetteur-récepteur sans fil permettant la mise en oeuvre de ce procédé. L'invention est caractérisée en ce que sur l'axe du temps, les symboles du spectre étalé contenus dans une sous-trame sont séparés par une série d'éléments zéro, la somme des longueurs d'ondes des séries d'éléments zéro correspondant à la trame des symboles du spectre étalé n'est pas égale. De plus, dans les différentes sous-trames des zones adjacentes sont réparties différentes séquences de longueurs d'ondes.
PCT/CN2000/000288 2000-09-25 2000-09-25 Procede de mise en reseau d'un systeme de communication mobile cellulaire et emetteur-recepteur sans fil associe WO2002025965A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2000/000288 WO2002025965A1 (fr) 2000-09-25 2000-09-25 Procede de mise en reseau d'un systeme de communication mobile cellulaire et emetteur-recepteur sans fil associe
CN00819808.XA CN1243448C (zh) 2000-09-25 2000-09-25 蜂窝移动通信系统的组网方法
AU2000275037A AU2000275037A1 (en) 2000-09-25 2000-09-25 A method of networking of cellular mobile communication system and its wireless transceiver

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PCT/CN2000/000288 WO2002025965A1 (fr) 2000-09-25 2000-09-25 Procede de mise en reseau d'un systeme de communication mobile cellulaire et emetteur-recepteur sans fil associe

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100372248C (zh) * 2003-11-14 2008-02-27 华为技术有限公司 一种实现蓝牙蜂窝组网的跳频序列生成方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100338961C (zh) * 2001-06-21 2007-09-19 中兴通讯股份有限公司 实现移动通信系统混合拓扑组网方式的装置和方法

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Publication number Priority date Publication date Assignee Title
US5509002A (en) * 1993-08-20 1996-04-16 At&T Corp. Operation of a CDMA net
CN1171709A (zh) * 1996-06-07 1998-01-28 Ntt移动通信网株式会社 用导频信道的传输衰减进行cdma通信系统小区选择的方法

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US5509002A (en) * 1993-08-20 1996-04-16 At&T Corp. Operation of a CDMA net
CN1171709A (zh) * 1996-06-07 1998-01-28 Ntt移动通信网株式会社 用导频信道的传输衰减进行cdma通信系统小区选择的方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100372248C (zh) * 2003-11-14 2008-02-27 华为技术有限公司 一种实现蓝牙蜂窝组网的跳频序列生成方法

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