WO2018119941A1 - Channel access method and apparatus - Google Patents

Abstract

Provided by the embodiments of the present application are a channel access method and apparatus. In one aspect in the embodiments of the present application: obtaining a spreading code used by a first system, wherein the spreading code is used to identify a channel occupied by the first system, and thereby obtaining a candidate spreading code; next, obtaining a target spreading code according to the candidate spreading code and the spreading code used by the first system, the target spreading code being used to identify a channel having the least communication interference with the first system among channels which are not occupied by the first system; and finally, indicating to a second receiving terminal to access a channel corresponding to the target spreading code. Hence, the technical solution provided by the embodiments of the present application may solve the problem in existing technology wherein the utilization of spectrum resources in a communication system is low.

Description

Channel access method and device Technical field

The present application relates to the field of communications technologies, and in particular, to a channel access method and apparatus.

Background technique

With the deepening of informatization, the amount of data in wireless communication has exploded, and the existing spectrum resources are becoming more and more tense. The method of resource allocation by using fixed frequency band division method can effectively allocate resources for different types of communication systems and users and avoid conflicts. However, in many divided frequency bands, the allocated spectrum resources have not been fully utilized. In most cases, the frequency band utilization of the static spectrum partitioning method is less than 10%. How to improve the utilization rate of existing spectrum resources is a technical problem that needs to be solved in the direction of improving communication efficiency.

Code Division Multiple Access (CDMA) is a wireless access technology widely used in the prior art. It is easy to implement due to its anti-interference, anti-fading, large capacity, soft handover and anti-spectrum analysis. In recent years, code division multiple access has been increasingly favored. In code division multiple access, the allocation of communication resources is realized by the allocation of spreading codes, and each user occupies a separate spreading code for establishing communication with the base station, in the code division multiple access downlink, The user's spreading code is orthogonal or nearly orthogonal, so that when receiving at the receiving end, the receiving end can effectively recover the transmitted signal as long as it knows the unique spreading code assigned.

In the process of implementing the present application, the inventors found that at least the following problems exist in the prior art:

In the prior art, many well-defined spectrum resources in a wireless communication system are not fully utilized, and the utilization rate of spectrum resources in the communication system is low.

Summary of the invention

In view of this, the embodiment of the present application provides a channel access method and device, which are used to solve the problem of low utilization of spectrum resources in the prior art communication system.

In one aspect, the embodiment of the present application provides a channel access method, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system package The second receiving end and the second sending end are included; the method is performed on the second sending end, and includes:

Obtaining a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system;

Obtaining a candidate spreading code;

And obtaining, by using the candidate spreading code and the spreading code used by the first system, a target spreading code, where the target spreading code is used to identify the first system that is not occupied by the first system. Signal with minimal interference to one channel;

Instructing the second receiving end to access a channel corresponding to the target spreading code.

The foregoing aspect and any possible implementation manner further provide an implementation manner of obtaining a candidate spreading code, including:

Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring a multipath channel matrix between each second receiving end and the second transmitting end;

A candidate spreading code for each second receiving end is obtained according to an autocorrelation matrix and a multipath channel matrix of each second receiving end.

The aspect as described above, and any possible implementation manner, further provide an implementation manner of obtaining a target spreading code according to the candidate spreading code and the spreading code used by the first system, including:

And obtaining, according to the candidate spreading code of each second receiving end, a spreading code used by the first system, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, and performing the first receiving Some of the maximum interference values of the interference values caused by the terminal;

Obtaining a spreading code corresponding to a smallest one of the largest interference values as the target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end .

The foregoing aspect, and any possible implementation manner, further provide an implementation manner, instructing the second receiving end to access a channel corresponding to the target spreading code, including:

Obtaining a sum of interference values caused by the second receiving end of all the second systems in the second system to the first system after the target receiving end accesses the communication system;

And when the sum of the interference values is less than a preset maximum interference threshold, indicating that the target receiving end accesses a channel corresponding to the target spreading code.

And the foregoing aspect, and any possible implementation manner, further providing an implementation manner, according to the candidate spreading code and the spreading code used by the first system, and obtaining each second receiving by using the following formula When the terminal accesses the channel corresponding to each candidate spreading code, the interference value caused by the first receiving end is:

Where J(c,q _i ) is the total mean squared correlation interference value of the i-th candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c represents the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.

On the other hand, the embodiment of the present application provides a channel access apparatus, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a The second receiving end and the second sending end; the device is located on the second sending end, and includes:

a first obtaining unit, configured to obtain a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system;

a second acquiring unit, configured to obtain a candidate spreading code;

a third obtaining unit, configured to obtain a target spreading code according to the candidate spreading code and a spreading code used by the first system, where the target spreading code is used to identify a channel that is not occupied by the first system A channel in which the signal interference of the first system is the smallest.

An access unit, configured to indicate that the second receiving end accesses a channel corresponding to the target spreading code.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the second obtaining unit is configured to:

Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring a multipath channel matrix between each second receiving end and the second transmitting end;

Obtaining each second receiving end according to an autocorrelation matrix and a multipath channel matrix of each second receiving end Candidate spreading code.

The aspect as described above and any possible implementation manner further provide an implementation manner, where the third obtaining unit is configured to:

And obtaining, according to the candidate spreading code of each second receiving end, a spreading code used by the first system, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, and performing the first receiving Some of the maximum interference values of the interference values caused by the terminal;

Obtaining a spreading code corresponding to a smallest one of the largest interference values as the target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end .

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, the device further includes:

a fourth acquiring unit, configured to acquire a sum of interference values caused by the second receiving end of all the second systems in the second system to the first system after the target receiving end accesses the communication system;

The access unit is configured to: when the sum of the interference values is less than a preset maximum interference threshold, instruct the target receiving end to access a channel corresponding to the target spreading code.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the third obtaining unit is further specifically configured to:

Determining, according to the candidate spreading code and the spreading code used by the first system, by using the following formula, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, The interference value caused by the receiving end:

Where J(c,q _i ) is the total mean squared correlation interference value of the i-th candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c represents the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.

One of the above technical solutions has the following beneficial effects:

The channel access method provided by the embodiment of the present application is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second a transmitting end; the method is performed on the second transmitting end, specifically, by obtaining a spreading code used by the first system, the spreading code is used to identify a channel occupied by the first system, and obtain a candidate spreading code, and further, Obtaining a target spreading code according to the candidate spreading code and the spreading code used by the first system, where the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least signal interference to the first system. Finally, Instructing the second receiving end to access the channel corresponding to the target spreading code. In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. One of ordinary skill in the art can also obtain other drawings based on these drawings without paying for inventive labor.

1 is a schematic diagram of a communication system in an embodiment of the present application;

2 is a schematic flowchart of Embodiment 1 of a channel access method according to an embodiment of the present application;

3 is a schematic flowchart of Embodiment 2 of a channel access method provided by an embodiment of the present application;

4 is a performance simulation diagram of a multi-user access communication system in an embodiment of the present application;

FIG. 5 is a functional block diagram of a channel access apparatus according to an embodiment of the present application.

detailed description

For a better understanding of the technical solutions of the present application, the embodiments of the present application are performed below with reference to the accompanying drawings. A detailed description.

It should be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms used in the embodiments of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the application. The singular forms "a", "the", and "the"

It should be understood that the term "and/or" as used herein is merely an association describing the associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, while A and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe a system or the like in the embodiments of the present application, these systems and the like should not be limited to these terms. These terms are only used to distinguish systems from each other. For example, the first system may also be referred to as a second system without departing from the scope of the embodiments of the present application. Similarly, the second system may also be referred to as a first system.

Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining" or "in response to detecting." Similarly, depending on the context, the phrase "if determined" or "if detected (conditions or events stated)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event) "Time" or "in response to a test (condition or event stated)".

Embodiment 1

The embodiment of the present application provides a channel access method. The method is applied to a communication system including a first system and a second system, wherein the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second transmitting end.

It should be noted that, in order to facilitate the description, the second receiving end involved in the present application is both The state of the channel to be accessed. In the actual application process, there may be z second receiving ends that have accessed the channel in the second system. The number of z is not particularly limited in this embodiment of the present application.

Specifically, please refer to FIG. 1 , which is a schematic diagram of a communication system in an embodiment of the present application. As shown in FIG. 1, the system includes a first system and a second system, where the first system includes one first transmitting end and K first receiving ends, and the second system includes one second transmitting end and one second system. The second receiving end of the communication system to be accessed.

In the communication system shown in FIG. 1, the signal sent by the first transmitting end can be received by the first receiving end and the second receiving end in the communication system, which is indicated by a solid line in FIG. 1; the signal sent by the second transmitting end is shown in FIG. It can be received by the first receiving end and the second receiving end in the communication system, and is indicated by a broken line in FIG.

In the communication system shown in FIG. 1, in the first system, the K first receiving ends have established communication with the first transmitting end, that is, the first transmitting end allocates K devices to the K first receiving ends. The spreading code is not limited in this embodiment. The number of Ks is at least one.

In the communication system shown in FIG. 1, one second receiving end is a receiving end of a channel to be accessed, and at this time, the second receiving ends are not connected to the communication system; wherein the number of Is may be one or more One.

In a specific implementation process, the first system may be the primary system and the second system may be the secondary system.

In another specific implementation, the communication system including the first system and the second system may be a code division multiple access communication system.

It can be understood that, in the communication system shown in FIG. 1, if any second receiving end accesses the channel, the communication between the newly accessed second receiving end and the second transmitting end is the first The communication between the first receiving end and the first transmitting end in the system generates signal interference. Therefore, the channel access method provided by the embodiment of the present application is determined by blindly analyzing signals on the first system frequency band. After the channel occupied by the system, the second receiving end accesses a channel with the least interference to the signal of the first system, so that normal communication between the first receiving end and the first transmitting end in the first system can be ensured. It also improves the utilization of spectrum resources in the communication system.

Based on the above concept, please refer to FIG. 2 , which is a schematic flowchart of Embodiment 1 of a channel access method according to an embodiment of the present application. As shown in FIG. 2 , the method includes the following steps:

S201. Obtain a spreading code used by the first system.

The spreading code is used to identify a channel occupied by the first system.

S202. Acquire a candidate spreading code.

S203. Obtain a target spreading code according to the candidate spreading code and the spreading code used by the first system.

The target spreading code is used to identify a channel in the channel that is not occupied by the first system that has the least interference to the signal of the first system.

S204. Instruct the second receiving end to access a channel corresponding to the target spreading code.

It should be noted that the execution body of S201-S204 may be a channel access device, and the device may be located at a second transmitting end in the communication system.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

Embodiment 2

Embodiment 3

The method for obtaining the candidate spreading code in S203 is specifically described in the embodiment of the present application, based on the channel access method provided in the first embodiment.

In the embodiment of the present application, a plurality of second receiving ends are in a state to be accessed by the channel. In this case, the candidate spreading codes corresponding to each of the second receiving ends are obtained. Specifically, the process includes the following steps:

Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring a multipath channel matrix between each second receiving end and the second transmitting end;

A candidate spreading code for each second receiving end is obtained according to an autocorrelation matrix and a multipath channel matrix of each second receiving end.

Hereinafter, for convenience of description, a candidate spreading code of a second receiving end is taken as an example for specific description.

To specifically describe the solution, the following embodiments of the present application provide the following two implementation manners for obtaining a candidate spreading code:

In the first implementation manner, according to the autocorrelation matrix R and the multipath channel matrix G, the candidate spreading code can be obtained according to the Rank-2 method by using the following formula:

q _i =arg max c ^T G ^H R ^-1 Gc

Where q _i is the _ith candidate spreading code in the candidate spreading code, j=1, 2...L,c represents a parameter, and at this time, c is a general spreading code, q _i ∈c, G is more The path channel matrix, R is the autocorrelation matrix, T is the transpose, and H is the conjugate transpose.

In the second implementation manner, the combination of the following Form 1 and Form 2 is continuously used to obtain the candidate spreading code.

Form 1, according to the autocorrelation matrix R and the multipath channel matrix G, and obtain the first candidate spreading code by using the following formula:

A=G ^H RG

Where A is the equivalent matrix of the channel and the periodic mean square correlation, G is the multipath channel matrix, R is the autocorrelation matrix, and H is the conjugate transpose;

Form 2, according to the autocorrelation matrix R and the multipath channel matrix G, and obtain the second candidate spreading code by using the following formula:

Where A is the equivalent matrix of the channel and the total mean square of the period, and A' is the equivalent matrix of the channel and the periodic mean square correlation of the previous calculation.

a cyclic shifting pattern of a spreading code occupied by the ith first receiving end, wherein

S _{i / l} is the 1-bit cyclic shift of the i-th first receiving end, and I is a unit matrix.

It should be noted that, when obtaining the second candidate spreading code by using the second mode, it is necessary to use the channel and the total mean square correlation matrix of the previous calculation, and then the last calculated channel and the period total mean square correlation. The equivalent matrix may be obtained according to the manner described in Form 1; or it may be obtained by the method described in Form 2.

It should be noted that, when acquiring the candidate spreading code of each second receiving end, any one of the foregoing two implementation manners may be used. However, when the number of the second receiving ends is multiple, the pins respectively acquire I. The same implementation is used when selecting the candidate spreading code for each of the second receiving ends.

In the second system, each second receiving end can obtain an autocorrelation matrix R related to its own wireless channel interference and noise, and therefore, when acquiring the autocorrelation matrix R of each second receiving end, the second sending The end can obtain the autocorrelation matrix R of the second receiving end directly in the second receiving end. However, when there are multiple second receiving ends of the communication system to be accessed, the autocorrelation matrix of each second receiving end to be accessed can be expressed as:

Where y _t represents the signal on the first system band received by the tth second receiving end, and N is the number of the second receiving end.

After the tth second receiving end accesses the channel, the total autocorrelation matrix of the second system can be expressed as:

among them,

For the total autocorrelation matrix after the t second second receiving end access signal, R _t is the autocorrelation matrix of the tth second receiving end, and G _t is the multipath channel matrix of the tth second receiving end, and P _j is The tth second receiving end corresponds to the jth transmitted signal energy matrix, c is a number, Z represents the number of second receiving ends that have been accessed, H represents conjugate transposition, and T represents transposition.

In addition, considering that each second receiving end has multiple candidate spreading codes, therefore, for convenience The continuation of the target spreading code is determined. In a specific implementation process, a candidate spreading code set corresponding to each second receiving end may be established.

It should be noted that the candidate spreading code may include the spreading code used by the first system.

In addition, according to the autocorrelation matrix R, the multipath channel matrix G, and the obtained candidate spreading code vector, the transmit signal energy corresponding to the second receiving end can also be obtained:

Where P _i is the transmitted signal energy corresponding to the ith second receiving end, and γ is a parameter.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

Embodiment 3

Based on the channel access method provided in the first embodiment, the method in the present application specifically describes the method for obtaining a target spreading code according to the candidate spreading code and the spreading code used by the first system in S203.

In the embodiment of the present application, a plurality of second receiving ends are in a state to be accessed by the channel, and therefore, in order not to affect the normal communication of the first system, the second receiving end of the communication system to be accessed may be At least one second receiving end is selected to access the communication system at a time, so that only one spreading code and the second receiving end having the least interference to the signal of the first system are acquired each time.

Specifically, when the number of the second receiving ends of the to-be-accessed channel is multiple, acquiring the target spreading code may include the following steps:

Obtaining each according to the candidate spreading code of each second receiving end and the spreading code used by the first system When the second receiving end accesses the channel corresponding to each candidate spreading code, the maximum interference value of the interference value caused by the first receiving end;

Obtaining a spreading code corresponding to a minimum one of the largest interference values as a target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end.

In a specific implementation process, according to the candidate spreading code and the spreading code used by the first system, and using the following formula, the interference value caused by the second receiving end to the first receiving end when accessing a candidate spreading code is obtained. :

Where J(c,q _i ) is the total mean squared interference value of the ith candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c is the parameter indicating the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.

The communication system shown in FIG. 1 is taken as an example for illustration.

In the communication system shown in FIG. 1, the second system has a second receiving end of a channel to be accessed, and the first system has K first receiving ends of the accessed channels, assuming each second to be received There are x candidate spreading codes at the end. Then, in the second receiving ends of FIG. 1, when each of the second receiving ends accesses the corresponding candidate spreading codes, communication between the K first receiving ends and the first transmitting end is generated. Signal interference, therefore, K interference values can be obtained according to each candidate spreading code, and by comparing the K interference values, one of the K interference values can be obtained. In this way, each of the second receiving ends can have x maximum interference values, and all the second receiving ends in the communication system to be accessed share I×x maximum interference values.

After that, the I×x maximum interference values are compared, and the candidate spreading code corresponding to the largest interference value with the smallest value is found as the target spreading code, and the second receiving end corresponding to the largest interference value with the smallest value. As the target receiver.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

Embodiment 4

Based on the channel access method provided in the first embodiment, the method in the embodiment of the present application specifically describes the method of “instructing the second receiving end to access the channel corresponding to the target spreading code” in S204.

It should be noted that, when the number of the second receiving ends is multiple, it is considered that there may be other second receiving ends of the accessing communication system in the second system. In this case, in order not to affect the normal communication of the first system, After determining the target receiving end and the target spreading code, determining that the second receiving end of all the accessed channels of the second system is caused by the second receiving end after the target receiving end accesses the channel corresponding to the target spreading code Whether the signal interference meets the specified conditions.

Specifically, if the signal interference caused by the second receiving end of all the accessed channels in the second system meets the specified condition, the target receiving end is connected to the channel corresponding to the target spreading code to the first system. The signal interference is still within a reasonable range, and therefore, the target receiving end is instructed to access the channel corresponding to the target spreading code. Or, if the signal interference caused by the second receiving end of all the accessed channels in the second system does not meet the specified condition, the target receiving end may be affected by the channel corresponding to the target spreading code. Normal communication of a system, therefore, does not indicate that the target receiving end accesses the channel corresponding to the target spreading code.

In a specific implementation process, the sum of the interference values caused by the second receiving end of all the second receiving systems in the second system to the first system may be obtained after the target receiving end accesses the channel corresponding to the target spreading code, and then, When the sum of the interference values is less than the preset maximum interference threshold, the target receiving end is instructed to access the channel corresponding to the target spreading code. Or when the sum of the interference values is equal to or greater than the preset maximum When the interference threshold is exceeded, the target receiving end is not given an access indication.

It can be understood that after the target receiving end accesses the channel corresponding to the target spreading code, the transmit signal power of all the receiving ends including the first receiving end and the second receiving end may be updated.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

Embodiment 5

Based on the channel access method provided in the foregoing Embodiment 1, the embodiment of the present application provides a specific implementation method of the foregoing channel access method.

Specifically, please refer to FIG. 3 , which is a schematic flowchart of Embodiment 4 of a channel access method according to an embodiment of the present application. As shown in FIG. 3, the method includes the following steps:

S301. Determine a plurality of second receiving ends of the communication system to be accessed.

S302. Acquire an autocorrelation matrix of each second receiving end, and obtain a multipath channel matrix between each second receiving end and the second sending end.

S303. Update a total autocorrelation matrix according to the second receiving end that has been accessed.

S304. The method according to the fifth embodiment, when obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, the maximum interference value of the interference value caused by the first receiving end.

S305. Acquire a spreading code corresponding to a minimum one of the maximum interference values, and obtain a spreading code corresponding to the smallest one of the maximum interference values, and obtain a second receiving end corresponding to the smallest one of the maximum interference values as the target receiving end.

S306. Acquire a sum of interference values caused by the second receiving end of all the second receiving systems in the second system to the first system, if the target receiving end accesses the channel corresponding to the target spreading code.

S307. Determine whether the sum of the interference values is less than a preset maximum interference threshold; if yes, execute S308; if not, execute S303.

S308. Instruct the target receiving end to access a channel corresponding to the target spreading code.

Please refer to FIG. 4 , which is a performance simulation diagram of a multi-user access communication system in an embodiment of the present application. As shown in FIG. 4, the curve 1, the curve 2, the curve 3, the curve 4, and the curve 5 are the signal access proposed by the embodiment of the present application when the number of the first receiving ends is 2, 6, 10, 14, and 18, respectively. The performance simulation diagram obtained by the scheme for multi-user access.

As shown in FIG. 4, for a case where a plurality of second receiving ends access the communication system, when the idleness of the first receiving end is high, and/or when the maximum interference threshold is high, the second receiving that can be accessed is The success rate of the terminal is higher. At this time, more second receiving ends can be accessed without affecting the normal communication of the first system.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

Embodiment 6

Based on the channel access method provided in the first embodiment, the embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments.

The embodiment of the present application provides a channel access apparatus, which is applied to a communication system including a first system and a second system, where the first system includes a first receiving end and a first transmitting end, and the second system includes a to-be-accessed a second receiving end and a second transmitting end of the communication system; the device is located on the second transmitting end.

Specifically, please refer to FIG. 5 , which is a functional block diagram of a channel access apparatus according to an embodiment of the present application. As shown in Figure 5, the device includes:

The first obtaining unit 51 is configured to obtain, according to the signal received from the first system frequency band, a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system;

a second obtaining unit 52, configured to obtain a candidate spreading code;

The third obtaining unit 53 is configured to obtain a target spreading code according to the candidate spreading code and the spreading code used by the first system, where the target spreading code is used to identify a signal in the first system that is not occupied by the first system. One channel with the least interference.

The access unit 54 is configured to indicate that the second receiving end accesses the channel corresponding to the target spreading code.

Specifically, in the embodiment of the present application, the second obtaining unit 52 is configured to:

Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring a multipath channel matrix between each second receiving end and the second transmitting end;

A candidate spreading code for each second receiving end is obtained according to an autocorrelation matrix and a multipath channel matrix of each second receiving end.

Specifically, in the embodiment of the present application, the third obtaining unit 53 is configured to:

Obtaining interference on the first receiving end when the channel corresponding to each candidate spreading code corresponding to each second receiving end is obtained according to the candidate spreading code of each second receiving end and the spreading code used by the first system Some of the largest interference values in the value;

Obtaining a spreading code corresponding to a minimum one of the largest interference values as a target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end.

In a specific implementation process, the device further includes:

The fourth obtaining unit 55 is configured to acquire, if the target receiving end accesses the communication system, the sum of the interference values caused by the second receiving end of all the second receiving systems in the second system to the first system;

The access unit 54 is configured to indicate the target when the sum of the interference values is less than a preset maximum interference threshold. The receiving end accesses the channel corresponding to the target spreading code.

In another specific implementation process, the third obtaining unit 53 is further configured to:

Determining, according to the candidate spreading code and the spreading code used by the first system, by using the following formula, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, The interference value caused by the receiving end:

Where J(c,q _i ) is the total mean squared correlation interference value of the i-th candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c represents the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.

Since the units in this embodiment can perform the method shown in FIG. 2, and the parts not described in detail in this embodiment, reference may be made to the related description of FIG. 2.

The technical solution of the embodiment of the present application has the following beneficial effects:

In the embodiment of the present application, the second sending end may obtain the spreading code used by the first system, and then the second sending end may determine a target extension for the second receiving end in the second system according to the current resource usage situation. The frequency code, the target spreading code is used to identify a channel in the unoccupied channel of the first system that has the least interference to the signal of the first system, so that the indication can be indicated without affecting the normal communication in the first system. The second receiving end accesses the channel corresponding to the target spreading code, which improves the frequency band utilization of the communication system. Therefore, the technical solution provided by the embodiment of the present application can solve the problem that the utilization rate of spectrum resources in the communication system in the prior art is low.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division, and may be implemented in actual implementation. In a different manner, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present application. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims (10)

1. A channel access method is characterized in that it is applied to a communication system including a first system and a second system, the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second a sending end; the method is performed on the second sending end, and includes:

   Obtaining a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system;

   Obtaining a candidate spreading code;

   And obtaining, by using the candidate spreading code and the spreading code used by the first system, a target spreading code, where the target spreading code is used to identify the first system that is not occupied by the first system. Signal with minimal interference to one channel;

   Instructing the second receiving end to access a channel corresponding to the target spreading code.
2. The method according to claim 1, wherein obtaining the candidate spreading code comprises:

   Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring a multipath channel matrix between each second receiving end and the second transmitting end;

   A candidate spreading code for each second receiving end is obtained according to an autocorrelation matrix and a multipath channel matrix of each second receiving end.
3. The method according to claim 1, wherein the target spreading code is obtained according to the candidate spreading code and the spreading code used by the first system, including:

   And obtaining, according to the candidate spreading code of each second receiving end, a spreading code used by the first system, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, and performing the first receiving Some of the maximum interference values of the interference values caused by the terminal;

   Obtaining a spreading code corresponding to a smallest one of the largest interference values as the target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end .
4. The method according to claim 1, wherein said second receiving end access station is indicated The channel corresponding to the target spreading code includes:

   Obtaining a sum of interference values caused by the second receiving end of all the second systems in the second system to the first system after the target receiving end accesses the communication system;

   And when the sum of the interference values is less than a preset maximum interference threshold, indicating that the target receiving end accesses a channel corresponding to the target spreading code.
5. The method according to claim 1 or 3, wherein, according to the candidate spreading code and the spreading code used by the first system, and using the following formula, obtaining a corresponding correspondence for each second receiving end The interference value caused to the first receiving end when the channel corresponding to each candidate spreading code:

   

   Where J(c,q _i ) is the total mean squared correlation interference value of the i-th candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c represents the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.
6. A channel access device is characterized in that it is applied to a communication system including a first system and a second system, the first system includes a first receiving end and a first transmitting end, and the second system includes a second receiving end and a second a sending end; the device is located on the second sending end, and includes:

   a first obtaining unit, configured to obtain a spreading code used by the first system, where the spreading code is used to identify a channel occupied by the first system;

   a second acquiring unit, configured to obtain a candidate spreading code;

   a third obtaining unit, configured to obtain a target spreading code according to the candidate spreading code and a spreading code used by the first system, where the target spreading code is used to identify a channel that is not occupied by the first system a channel in which the signal interference of the first system is the smallest;

   An access unit, configured to indicate that the second receiving end accesses a channel corresponding to the target spreading code.
7. The device according to claim 6, wherein the second obtaining unit is configured to:

   Obtaining an autocorrelation matrix obtained by each second receiving end, and acquiring each second receiving end and the second sending Multipath channel matrix between the ends;

   A candidate spreading code for each second receiving end is obtained according to an autocorrelation matrix and a multipath channel matrix of each second receiving end.
8. The device according to claim 6, wherein the third obtaining unit is configured to:

   And obtaining, according to the candidate spreading code of each second receiving end, a spreading code used by the first system, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, and performing the first receiving Some of the maximum interference values of the interference values caused by the terminal;

   Obtaining a spreading code corresponding to a smallest one of the largest interference values as the target spreading code; and acquiring a second receiving end corresponding to the smallest one of the largest interference values as the target receiving end .
9. The device according to claim 6, wherein the device further comprises:

   a fourth acquiring unit, configured to acquire a sum of interference values caused by the second receiving end of all the second systems in the second system to the first system after the target receiving end accesses the communication system;

   The access unit is configured to: when the sum of the interference values is less than a preset maximum interference threshold, instruct the target receiving end to access a channel corresponding to the target spreading code.
10. The device according to claim 6 or 8, wherein the third obtaining unit is further configured to:

    Determining, according to the candidate spreading code and the spreading code used by the first system, by using the following formula, obtaining a channel corresponding to each candidate spreading code corresponding to each second receiving end, The interference value caused by the receiving end:

    

    Where J(c,q _i ) is the total mean squared correlation interference value of the i-th candidate spreading code for the first receiving end, M is the number of decomposable multipaths of the multipath channel, and c represents the parameter In this case, c is a general spreading code, q _i ∈ c, q _{i / l} represents a 1-bit cyclic right shift of the i-th candidate spreading code q _i , and T represents a transposition.

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