CN1243448C - Method of networking of cellular mobile communication system and its wireless transceiver - Google Patents

Abstract

The present invention relates to a networking method of a cellular mobile communication system with code division multiple access and a wireless transceiver for realizing the method. The present invention has the core that spread spectrum symbols inside subframes are spaced by zero element strings on a time axis, and the sum length of all spread spectrum symbols is unequal to and different from that of the corresponding zero element strings. Different arrangements of the unequal and different sum length are assigned inside the subframes on the different adjacent cells/sectors.

Description

Networking Method of Cellular Mobile Communication System

technical field

The present invention relates to a kind of spread spectrum and digital multiple access wireless communication technology, relate in particular to the networking method of the cellular wireless communication network applied in any wireless digital communication system including Code Division Multiple Access (CDMA) and spread spectrum technology and realize this method of wireless transceivers.

Background of the invention

Since the 1970s, mobile communication has developed from a simple intercom system and a single-frequency simplex dedicated system to a full-duplex cellular public communication network that can automatically dial-up with the ground fixed network. This kind of communication network needs to complete the information transmission between multiple points, can accommodate thousands of users, and can be networked across cities, regions, and even across borders. Therefore, it is necessary to design the networking mode to meet the urgent needs of people for wireless communication technology in the information age.

For traditional wireless multiple access technologies, such as FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access), the system capacity is fixed, and it is impossible to increase the number of additional users. CDMA is different, it has the characteristics of large capacity and soft capacity, and its system capacity does not have an insurmountable limit like FDMA or TDMA.

In a code division multiple access (CDMA) communication system, each user has its own unique spread spectrum address code for mutual identification. Generally speaking, in the same cell (or sector), the spreading address codes of users should be completely or nearly completely orthogonal to each other. However, the spread spectrum address codes between users in different cells (or sectors) should have as large a difference as possible. This requirement of orthogonality between different user signals is consistent for any multiple access system. It is required that the spread spectrum address codes between users in different cells (or sectors) have as much difference as possible, not only for the convenience of identifying cells (or sectors) and users, but also to reduce the number of adjacent cells (or sectors) ) Mutual interference between wireless users. Because in general, a subscriber station (or base station) will receive signals from adjacent cell (or sector) base stations (or subscriber stations) in addition to receiving signals from the base station (or subscriber station) of the cell (or sector). Signal.

Existing wireless CDMA cellular mobile communication systems, including the IS-95 system in North America and the W-CDMA system in Europe, all use longer pseudo-random codes for secondary spread spectrum on the cell network. For example: The forward channel design technology of IS-95 is to divide the used frequency band into many channels with 1.25MHz interval, and one cell opens a channel. The forward channel uses the Walsh function code as the address code to establish a code division channel. Each base station uses a pair of orthogonal pseudo-random codes (pilot PN sequences) to perform four-phase modulation, and the pilot PN sequences of all base stations have the same generation structure. However, the pilot PN sequences of different base stations have different phase offsets. The mobile station uses different phase offsets to distinguish signals sent by different cells or sectors. That is, each cell (or sector) base station receiver distinguishes signals from different cells (or sectors) by using different offset phase sequences of the same or several long pseudo-random codes. Therefore, in the forward logical channel division of CDMA, a pilot channel (Pilot channel) is designed. The pilot channel sends a spread spectrum signal without data information, but includes the pilot PN sequence phase offset and Frequency reference information. The pilot channel is always transmitted and has a higher transmission level than other signals. After the mobile station completes synchronization with the nearest base station using the strongest pilot signal, the relationship between the phase offset of the pilot PN sequence and the strength of the pilot signal can be known. The phase offset of the pilot PN sequence indicates the CDMA channel of a particular base station. In CDMA systems, frequency allocation has been transformed into a pilot PN sequence offset planning problem.

In the reverse channel design of IS-95, it adopts a longer PN code sequence as the user's identification code. For example, long PN sequence (242-1) codes with different phase offsets are used as connection addresses. The base station receiver and the mobile user receiver have different mechanisms for distinguishing different users, which leads to the system having to use two receiver technologies in the base station receiver and the mobile station receiver at the same time, resulting in complex hardware and software change.

The method of using different offset segments of a long pseudo-random sequence (Long PN Sequence) as a user identification code, although the orthogonality between all user signals in the same cell will not be changed, and the Inter-signals are also distinguishable due to the different offsets of the longer pseudo-random code. However, due to the introduction of the pseudo-random code, the correlation characteristics between the simple channel codes used in the same cell and the correlation characteristics after adding the base station identification code through secondary spreading have a large change. This change is mainly reflected in the change of the value of the sidelobe of the correlation function. The correlation characteristics between pure channel codes emphasized here include not only the orthogonality characteristics between channel codes, but also the offset correlation characteristics between channel codes. If the identification information of the base station is added by using this secondary spreading method, as mentioned above, the secondary peak value of the correlation function of the spreading code will be changed. If the system requires that the values at some sub-peak positions, especially the adjacent positions of the main peak, do not change (equal to zero is best) due to performance requirements, then the above method will not be able to guarantee the requirement that the relevant sub-peaks remain unchanged.

In a wireless communication system, due to the diversity of propagation paths and the complexity of propagation conditions for wireless signals, the distinction between multiple code division channels at a receiver (or transmitter) end not only depends on the orthogonality between code division channels , and also rely on their mutual offset-related properties. A CDMA scheme with a zero-correlation window is mentioned in the patent (PCT/CN00/00028) entitled "A Spread Spectrum Multi-address Encoding Method with a Zero-Correlation Window". In this invention, a spread spectrum multi-address code is disclosed. Applying the generation method of the spread spectrum multi-address code (see this patent for details), the autocorrelation and cross-correlation functions of the newly generated spread spectrum multi-address code can form a "zero correlation window" near the origin, and in this "zero correlation In the “window”, the Multiple Access Interference (MAI) and Inter-Symbol Interference (ISI) are zero. Therefore, the code division channel codes selected in a cell have unique correlation characteristics with each other. The correlation characteristics between channel codes not only have complete orthogonality, but also its offset correlation characteristics are fixed (0) in a certain offset interval; therefore, this code division multiple access scheme is very suitable for path effect in wireless communication systems.

In order to increase the number of users of the system on the geographical plane distribution, the use of the above-mentioned "spread spectrum multi-address coding method with zero correlation window" in the cellular cell network of the CDMA system is considered. If the original technical scheme similar to IS-95 and W-CDMA is used to network the wireless communication system, the long pseudo-random code introduced in each cell will destroy the zero correlation between the codes in the cell window characteristics, the performance of the system will deteriorate, thus losing the superiority of address codes with zero-correlation window codes.

Contents of the invention

The object of the present invention is to provide a networking method of a cellular wireless communication system using code division multiple access and spread spectrum technology.

The object of the present invention is further to provide a kind of networking method of the cellular wireless communication system using code division multiple access and spread spectrum technology, can not destroy the zero correlation window characteristic of the multi-address code with zero correlation window in networking.

According to one aspect of the present invention, a networking method of a code division multiple access cellular mobile communication system is provided, the core of which is that, on the time axis, the spread spectrum symbols inside the subframe are spaced by zero element strings, each The sum lengths (that is, the sum of lengths) of a spread spectrum symbol and the corresponding zero element strings are not equal and different, and different adjacent cell/sector subframes are assigned different said different Permutations of equal and different and lengths.

According to another aspect of the present invention, a wireless transceiver for realizing the above networking method is provided, which may be a base station or a mobile station of a cellular wireless mobile communication system, and at least includes a modulation and spread spectrum module for transmitting The data is modulated and spread; the despreading and demodulating module is used to despread and demodulate the received data; it further includes a dynamic spreading code generator, which is used to generate spreading codes for the modulation and spreading module and the despreading demodulation module, and according to the framing information of the cell/sector where it is located, the spread spectrum symbols in the subframe are spaced by the zero element string specified by the framing information.

The invention provides a simple and easy-to-implement networking method of a cellular wireless mobile communication system, which can greatly reduce the interference level between adjacent cells/sectors compared with the existing system. The invention solves the multi-district system networking scheme and at the same time maintains the zero-correlation window characteristic of the spread spectrum multiple access code in the same subdistrict. Since the zero-correlation window feature is maintained, the user coverage area and the number of users of the CDMA system are increased; with the increase of the above parameters, the actual cost per unit area and unit user of the system will be greatly reduced; the utilization rate of wireless spectrum resources is improved , which increases the total capacity of the CDMA system, thereby realizing a large-capacity, large-coverage wireless communication system.

Another advantage of the present invention is, adopt 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 hardware of the base station wireless transceiver and the mobile station wireless transceiver Software requirements.

Brief description of the drawings

In order to make the object, technical solution and advantages of the present invention clearer, the following examples are given together with the accompanying drawings to further describe the present invention in detail. in

Fig. 1 shows a block diagram of the composition of a cellular network;

Fig. 2 shows a preferred embodiment of the wireless transceiver of the present invention;

Fig. 3 shows a kind of physical layer frame structure adopting the networking method of the present invention;

Fig. 4 shows a preferred embodiment of the networking method according to the present invention, the length of the zero element string inserted in different subframe structures inside the cell;

Figure 5 shows a typical 7 cell wireless communication cellular network geographic topology model;

Fig. 6 shows a symbol characteristic evaluation diagram of the LA method between two cells;

Fig. 7 shows a diagram of a 16-cell subframe construction scheme with zero element insertion arrangement;

Figure 8 shows the period and minimum interval of the 16-pulse LA code.

Modes of Carrying Out the Invention

Figure 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 stage, the mobile service switching center MSC will send the specific subframe allocation scheme to the base station controller BSC according to the traffic volume, parameters such as business types, and the base station sends and receives signals. The spreading code generator in the machine BS will perform corresponding conversion according to the framing parameters sent by the base station controller BSC. 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 transceiver station BS, and applies these parameters to its own transmitter and receiver internal A spread spectrum code generator to realize corresponding communication services.

Figure 2 shows a preferred embodiment of the wireless transceiver of the present invention. Please refer to Fig. 2, at the receiving end of the transceiver, the receiving antenna 103 couples the high-frequency modulation signal through the coupler 104, completes the down-conversion in the carrier frequency unit 106, and the dynamic spread spectrum code generator 110 receives the signal according to the public control channel The framing control information of the module 109 is demodulated and despreaded in the demodulator and despreader 108 to the information output by the carrier frequency unit 106, and then output data; The framing control information of the input data is modulated and spread in the modulation spreader 107, and then converted into a radio frequency signal by the carrier frequency unit 105, and sent by the transmitting antenna 102 after passing through the coupler 104. The main frequency generator 100 provides an intermediate frequency reference source for the carrier frequency units 105 and 106 through the clock unit 101 and provides a standard clock for the entire transceiver, and the common control channel receiving module 109 receives the common control channel information from the carrier frequency unit 106 rear end, And provide this information to the dynamic spreading code generator 110.

The dynamic spreading code generator 110 is used to dynamically allocate the subframe internal structure of each cell (or sector), so as to complete the communication between different cells. In this embodiment, the dynamic spreading code generator 110 obtains the framing information (also including the spreading code allocation information) from the common control channel receiving module 109 .

The core of the networking method of a code division multiple access cellular mobile communication system of the present invention is that, on the time axis, the spread spectrum symbols inside the subframe are spaced by zero element strings, and each spread spectrum symbol sums with it The sum lengths (that is, the sum of lengths) of the corresponding zero element strings are unequal and different, and within the subframes of different adjacent cells/sectors, different sum lengths of the unequal and different sum lengths are allocated. arrangement. Wherein the so-called “zero element string corresponding to the spread spectrum symbol” can be defined as the zero element string immediately following the spread spectrum symbol, can also be defined as the zero element string located before the spread spectrum symbol, and can also be defined as the zero element string located before the spread spectrum symbol A part of the zero-element string before the spread spectrum symbol plus a part of the zero-element string immediately following the spread spectrum 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.

Preferably, the unequal and different sum lengths satisfy: only one sum length is any odd number greater than the minimum sum length, 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 lengths.

Preferably, the spreading symbols in the subframe are spread by LS codes (the LS codes will be described in detail later).

Preferably, subframes of different cells/sectors have the same and fixed subframe length.

Preferably, the lengths of the spreading symbols in the subframe are the same and fixed.

The present invention realizes the networking method of the new cellular mobile communication network by reconstructing the frame structure on the physical layer, especially the subframe structure.

When networking a cellular wireless communication system in the prior art solution, it is usually assumed that the frame structure adopted by users in different cells is consistent, and the subframe structure is also consistent, and the only difference is the number of extended symbols. Spread spectrum address codes are different. The present invention completely changes the subframe structure, and allocates different subframe structures for different cells/sectors, so as to achieve the purpose of distinguishing different adjacent cells/sectors.

Specifically, the present invention implements cell networking by changing the arrangement of intervals between spread spectrum symbols inside a subframe. For example, by adopting a reasonable arrangement of inserting unequal-length zero-element strings between the spreading symbols in each cell signal, the probability of complete symbol collision between different cell signal code groups is reduced, that is, adjacent cell interference (ACI) is reduced. .

Preferably, it can be implemented by changing the arrangement of intervals between spreading symbols within the subframe under the premise of keeping the subframe length unchanged.

The length of the spreading symbol and the zero-element string may be the sum of a fixed-length spreading code (such as an LS code) and lengths of zero-element strings of different lengths.

The lengths of the spread symbols and zero-element strings may also be the sum of different lengths of spreading codes (such as LS codes) and different lengths of zero-element strings.

In a PCT international patent application with the application number PCT/CN98/00151, the inventor being Li Daoben, and the title "A Spread Spectrum Multiple Address Code Encoding Technology", a method for encoding a spread spectrum multiple address code is disclosed. This kind of spreading code has good auto-correlation and cross-correlation characteristics. For the sake of brevity, this kind of spreading code is referred to as LA code for short in the description of the present invention.

The LA code is composed of polarized basic pulses with a normalized amplitude and width of 1. The number of basic pulses depends 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 number of orthogonal pulse compression codes, the number of orthogonal frequencies that can be used, the system bandwidth, and the maximum transmission rate of the system are determined by these actual factors. The intervals of the basic pulses on the time coordinate are not equal and different. Equal and distinct pulse position and pulse polarity permutation coding. By adopting the above design, a simple and fast design method of spread spectrum address code is provided for spread spectrum technology and digital multiple access technology. The characteristics of the LA code are: first: the main peak of the autocorrelation function is equal to the number of basic pulses, and also equal to the number of orthogonal codewords in the code group; second: the secondary peak of the autocorrelation and cross-correlation functions is only +1 , -1 and 0 three possible values. The LA code can be used to identify different cells.

In relation to the present invention, preferably, in the same subframe, the sum length of each spreading symbol and corresponding zero element string can be obtained by LA code. That is, the sum length adopts the width of each interval of the basic pulse of the LA code.

In a PCT international patent application with the application number PCT/CN00/00028, the inventor is Li Daoben, and the title "A Spread Spectrum Multiple Access Coding Method with Zero Correlation Window", a spread spectrum multiple access coding method with zero correlation window is disclosed. Multiple address codes are called LS codes. Since LS codes are composed of C codes and S codes, they are also called CS codes. The generation method of LS codes (CS codes) is described in detail in PCT/CN00/00028. It is omitted here. The designed spread spectrum multi-address code with "zero correlation window" has the following two characteristics: First, the autocorrelation function of each spread spectrum address code is zero everywhere except the origin, that is, it has the most ideal characteristics. From the point of view of orthogonality, each spread spectrum address code is completely orthogonal to any non-zero time delay except zero time delay. Second: There is a "zero correlation window" near the origin in the cross-correlation function between the spread spectrum address codes. From the perspective of orthogonality, when the relative time delay between the spread spectrum address codes is smaller than the width of the "zero correlation window", they are completely orthogonal.

In the case of using the LS code as the spread spectrum multi-address code, if the original technical scheme similar to IS-95 and W-CDMA is used to network the wireless communication system, then the long pseudo-random code introduced in each cell The code will destroy the zero-correlation window characteristic between the LS code and the LS code in the cell, and the performance of the system will deteriorate, thus losing the superiority of the code-divided address code with the zero-correlation window. However, the networking method of the present invention can avoid destroying the zero-correlation window characteristic of the LS code. In this way, the superiority of the LS code having a zero-correlation window can be reflected. Thus, more access code channels and higher communication quality are simply realized.

Fig. 3 shows a physical layer frame structure using the networking method of the present invention. Each frame is composed of k+1 subframes, K=0, 1, 2, ... N, and SF* in the figure represents a subframe. Each subframe of SF1, SF2, ... SFK is composed of m symbols spread by the spreading code shown as CS and a string of zero elements after each symbol. As shown in the subframe expansion schematic diagram in the figure, the positions marked with letters A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, and P represent the insertion of zero elements At the same time, each letter represents the length of the inserted zero element string. In the following description, A=n means that the length of the string of zero elements at position A is n. The CS in the subframe represents an extended symbol, which is extended by a CS code mentioned in "A Spread Spectrum Multi-address Coding Method with Zero Correlation Window", and the CS code used in a subframe They can be the same CS code or different CS codes. Also, the lengths of the respective CSs may be the same or different.

Based on the basis of the frame structure described above, we will further describe the specific implementation of the present invention. Fig. 4 shows the lengths of zero-element strings inserted in different subframe structures inside a cell according to a preferred embodiment of the networking method of the present invention. In FIG. 4 , the two tables respectively represent the lengths of zero element strings inserted in different subframe structures inside two cells at positions where zero elements need to be inserted. The lengths of the zero-element string inserted into the subframe of cell A are: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 1; The lengths of the frame insertion zero element string are: 2, 6, 10, 14, 18, 22, 26, 1, 0, 4, 8, 12, 16, 20, 24, 28; the subframe of cell C inserts zero elements The length of the string is other arrangement different from cells A and B, which is omitted here. The length of the string of zero elements in a subframe can be either an odd number or an even number. In the above-mentioned special embodiment, only one of the lengths of zero-element strings of each type of cell subframe has an odd length, and the others have even lengths. However, the method of the present invention also includes any combination of other odd lengths and even lengths.

Fig. 7 shows a diagram of a 16-cell subframe construction scheme with zero element insertion arrangement. In this construction scheme as an embodiment, among 16 different cells, the subframe lengths are all 2387 TC.

Considering the LA code, the present invention can be implemented as follows:

Select an LA code group. Taking the 16-pulse LA code group as an example, the period and minimum interval of the 16-pulse LA code can be selected in many ways. Referring to FIG. 8, FIG. 8 shows the period and the minimum interval of the 16-pulse LA code. Take an orthogonal code group in which the minimum interval is 136 and the minimum period is 2387 as an example. In the LA orthogonal code group, each code word is composed of 16 basic pulses, and the intervals between each basic pulse are: 136, 138, 140, 142, 144, 146, 148, 150, 152, 154 , 156, 160, 162, 164, 137. In this embodiment, taking one of the codewords as an example, different cells (or sectors) 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 interval Different arrangements of intervals are used to identify different cells (or sectors).

In order to improve the duty cycle of the LA code, the CS code can be used to increase the duty cycle. By inserting unequal-length zero-element strings between the symbols extended by the CS code, the arrangement order of pulse intervals with the same polarity codeword can be changed. The CS code is used to spread symbols within a subframe. The CS codes used in one subframe may be the same CS code or different CS codes. Moreover, the lengths of the respective 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 with the same length is used as the spreading code, and its length is 136.

Preferably, the frame structure can adopt the same frame structure as IS-95, that is, the frame length is 20 ms and the bandwidth is 1.2288 MHz. In this embodiment, each frame is composed of 10 subframes, namely SF0, SF1, SF2, ... SF9. Wherein, the length of each subframe of SF1, SF2, ... SF9 remains unchanged. In each subframe, it is extended by the above-mentioned LA code, and at the same time, in each LA pulse interval, taking code 1 as an example, it is filled with the above-mentioned CS code to increase the duty cycle. In this embodiment, a CS code with a length of 136 is used for padding. The LA symbol interval is the same as that of the CS code, and both take T _c as the unit.

In order to still maintain the pulse interval of the LA code, it can be realized by inserting a string of zero elements behind the symbol extended by the CS code. For example, when the pulse interval is 136, insert 0 zeros, when the pulse interval is 138, insert a zero element string of 2 zeros, when the pulse interval is 140, insert a zero element string of 4 zeros, and so on analogy.

In order to realize different arrangements of LA pulse intervals, different arrangements of pulse intervals can be realized by inserting different zero-element strings behind the symbols extended by CS codes. For example, we can adopt an arrangement of intervals between spreading symbols within a subframe, such as inserting zero-element strings of this length after the 16 symbols spread by CS codes, 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 Figure 7 is obtained, which can be used To identify cell A; we can also insert a string of zero elements of this length after the 16 symbols extended by the CS code, 2, 6, 10, 14, 18, 22, 26, 1, 0, 4, 8, 12, 16, 20, 28, at this time, a spaced arrangement shown in No. 2 in Fig. 7 is obtained, and this arrangement can be used as the identification of the B cell. According to this method, any other set of data in FIG. 7 can be applied to the subframe construction method inside each cell, so as to realize the distinction between base station signals and mobile user signals between cells.

The code length of the basic CS code listed in FIG. 7 is 136, which can be respectively applied to the data in the subframe arrangement of 16 different cells (or sectors). Each line is the sum of the lengths of the basic CS code and different zero element strings. In this embodiment, taking the first line as an example, they are 136, 138, 140, ... 137, indicating that each CS code is The number of zero-element strings inserted after the extended sign is 0, 2, 4, ... 1. Each row can be used in one cell (or sector). 16 groups of data have been listed in the table, which is a preferred embodiment of the present invention, and it is characterized in that each column of the data in the table is different, that is, for inserting zero at the same position of the subframe of each subdistrict (or sector) The number of element strings is different.

As mentioned above, in the most common wireless communication cellular network, taking the 7-cell model as an example, referring to Figure 5, you can select any 7 sets of data in the attached table, and apply these data to the subframes inside each cell In the construction method, in order to realize the difference between the base station signal and the mobile user signal between each cell.

The cell (or sector) networking solution of the present invention can effectively reduce adjacent cell interference (ACI). Because the change of the basic pulse interval of the LA code basically does not affect the correlation characteristics of the CS codes in the same cell (or sector), and the correlation sub-peaks of the CS codes in different cells (or sectors) are relatively small, so that the effective Adjacent Cell Interference (ACI) is reduced. Using this cell (or sector) networking method can make the networking method simple and easy to implement. From the simulation curve, refer to Figure 6. Figure 6 is the evaluation of the sign characteristics of the LA method between the NO.1 and NO.2 cells (subframe zero offset). It can be seen that the beneficial effects of the cell networking scheme of the present invention are obtained. This figure describes that two sets of LA arrangement data in No.1 and No.2 in Figure 7 are used for A cell and B cell respectively. The investigated user in A cell uses CS code 1, and the interfering user signal in B cell Use CS code 8. Among them, CS code 1 and CS code 8 are a pair of equal-length orthogonal code groups generated according to the "spread spectrum address code method with zero correlation window". The abscissa in the figure represents the 16 output moments of the 16 spread symbols in a subframe at the 16 output moments of the relevant receiver, and the ordinate represents the output value at the output moment of the relevant receiver, which reflects the influence of the interfering users of cell B on cell A The interference of the user under investigation. As shown in the figure, the adjacent cell interference between the two cells is very small. This also illustrates the beneficial effects of the networking method of the present invention.

Those of ordinary skill in the art clearly understand and understand that the above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. The present invention can be modified and improved in many ways, and in addition to the above-mentioned specific preferred modes, the present invention can also have many other embodiments. Therefore, all methods or improvements that can be obtained according to the concept of the present invention should be included in the scope of rights of the present invention.

Claims (10)

1, a kind of network-building method of code vision multiple address cellular mobile communication system, it is characterized in that: on time shaft, dynamically the spreading code maker with between the spread symbol of subframe inside with zero element strain step separately, each spread symbol and corresponding zero element strain with it each is unequal and different with length; Dynamically the spreading code maker distributes different described each steps unequal and different and arrangement length in the subframe inside of different adjacent cells/sectors.

2, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1, it is characterized in that: described each unequal and different satisfying with length, have only one and length to be any odd number greater than minimum and length, all the other and length are even number, and any one and be uneven in length in other two or more and the length sum.

3, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1 is characterized in that: the spread symbol described in the subframe is to be expanded by the LS sign indicating number.

4, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1 is characterized in that: the subframe of different districts/sector has identical and fixing subframe lengths.

5, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1 is characterized in that: the length of the described spread symbol of subframe inside is identical and fixing.

6, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1 is characterized in that: base station transceiver adds the framing information of this cell/section in Common Control Channel, inserts or switches for mobile transceiver.

7, the network-building method of code vision multiple address cellular mobile communication system as claimed in claim 1, it is characterized in that: in network activation or update stage, mobile services switching centre sends to base station controller with the sub-frame allocation scheme, and the framing information that the dynamic spreading code maker in the base station transceiver is sent according to base station controller carries out corresponding conversion; Insert or during handover, mobile transceiver is finished and inserted or handover according to the framing information in the base station transceiver at mobile transceiver.

8, a kind of radio receiving-transmitting unit that is used for code vision multiple address cellular mobile communication system includes at least, and the modulation spread spectrum module is used for the data that send are modulated spread spectrum; Despread and demodulator is used for the data that receive are carried out despread-and-demodulation; It is characterized in that further including:

Dynamic spreading code maker, it is connected with Despread and demodulator, modulation spread spectrum module, be used to generate spreading code and offer described modulation spread spectrum module and described Despread and demodulator, and described dynamic spreading code maker is according to the framing information of cell/section of living in, between the spread symbol of subframe inside with the zero element strain of described framing information appointment separately.

9, radio receiving-transmitting unit as claimed in claim 8 is characterized in that further including: the Common Control Channel receiver module is used for the framing information of receiving common control channels, this framing information is offered described dynamic spreading code maker.

10, radio receiving-transmitting unit as claimed in claim 8 is characterized in that: described spreading code is the LS sign indicating number.

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