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WO2018119941A1 - Procédé et appareil d'accès à un canal - Google Patents

Procédé et appareil d'accès à un canal Download PDF

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Publication number
WO2018119941A1
WO2018119941A1 PCT/CN2016/113236 CN2016113236W WO2018119941A1 WO 2018119941 A1 WO2018119941 A1 WO 2018119941A1 CN 2016113236 W CN2016113236 W CN 2016113236W WO 2018119941 A1 WO2018119941 A1 WO 2018119941A1
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WO
WIPO (PCT)
Prior art keywords
spreading code
receiving end
channel
target
obtaining
Prior art date
Application number
PCT/CN2016/113236
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English (en)
Chinese (zh)
Inventor
李明
遆光宇
Original Assignee
深圳天珑无线科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳天珑无线科技有限公司 filed Critical 深圳天珑无线科技有限公司
Priority to PCT/CN2016/113236 priority Critical patent/WO2018119941A1/fr
Publication of WO2018119941A1 publication Critical patent/WO2018119941A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a channel access method and apparatus.
  • Code Division Multiple Access 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.
  • 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.
  • 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 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;
  • 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:
  • the interference value caused by the first receiving end is:
  • 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
  • c represents the parameter
  • c is a general spreading code
  • q i / l represents a 1-bit cyclic right shift of the i-th candidate spreading code q i
  • T represents a transposition.
  • 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 third obtaining unit is configured to:
  • 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.
  • 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
  • c represents the parameter
  • c is a general spreading code
  • q i / l represents a 1-bit cyclic right shift of the i-th candidate spreading code q i
  • T represents a transposition.
  • 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.
  • 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.
  • FIG. 1 is a schematic diagram of a communication system in an embodiment of the present application.
  • Embodiment 1 of a channel access method according to an embodiment of the present application
  • Embodiment 3 is a schematic flowchart of Embodiment 2 of a channel access method provided by an embodiment of the present application;
  • FIG. 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.
  • 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.
  • the first system may also be referred to as a second system without departing from the scope of the embodiments of the present application.
  • the second system may also be referred to as a first system.
  • the word “if” as used herein may be interpreted as “when” or “when” or “in response to determining” or “in response to detecting.”
  • 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)”.
  • 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.
  • the second receiving end involved in the present application is both The state of the channel to be accessed.
  • the number of z is not particularly limited in this embodiment of the present application.
  • FIG. 1 is a schematic diagram of a communication system in an embodiment of the present application.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first system may be the primary system and the second system may be the secondary system.
  • the communication system including the first system and the second system may be a code division multiple access communication system.
  • 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.
  • FIG. 2 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:
  • the spreading code is used to identify a channel occupied 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.
  • 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 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.
  • 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.
  • a plurality of second receiving ends are in a state to be accessed by the channel.
  • the candidate spreading codes corresponding to each of the second receiving ends are obtained.
  • the process includes the following steps:
  • 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.
  • a candidate spreading code of a second receiving end is taken as an example for specific description.
  • the candidate spreading code can be obtained according to the Rank-2 method by using the following formula:
  • q i is the ith candidate spreading code in the candidate spreading code
  • j 1, 2...L
  • c represents a parameter
  • c is a general spreading code
  • G is more
  • R is the autocorrelation matrix
  • T is the transpose
  • H is the conjugate transpose.
  • 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 is the equivalent matrix of the channel and the periodic mean square correlation
  • G is the multipath channel matrix
  • R is the autocorrelation matrix
  • 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:
  • A is the equivalent matrix of the channel and the total mean square of the period
  • A' is the equivalent matrix of the channel and the periodic mean square correlation of the previous calculation.
  • 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.
  • 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.
  • 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.
  • the autocorrelation matrix of each second receiving end to be accessed can be expressed as:
  • y t represents the signal on the first system band received by the tth second receiving end
  • N is the number of the second receiving end
  • the total autocorrelation matrix of the second system can be expressed as:
  • R t is the autocorrelation matrix of the tth second receiving end
  • G t is the multipath channel matrix of the tth second receiving end
  • 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
  • T represents transposition.
  • each second receiving end has multiple candidate spreading codes, therefore, for convenience
  • the continuation of the target spreading code is determined.
  • a candidate spreading code set corresponding to each second receiving end may be established.
  • the candidate spreading code may include the spreading code used by the first system.
  • the transmit signal energy corresponding to the second receiving end can also be obtained:
  • P i is the transmitted signal energy corresponding to the ith second receiving end
  • ⁇ is a parameter
  • 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.
  • 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.
  • 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.
  • acquiring the target spreading code may include the following steps:
  • the interference value caused by the second receiving end to the first receiving end when accessing a candidate spreading code is obtained.
  • 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
  • c is the parameter indicating the parameter
  • 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
  • T represents a transposition.
  • the communication system shown in FIG. 1 is taken as an example for illustration.
  • the second system has a second receiving end of a channel to be accessed
  • the first system has K first receiving ends of the accessed channels, assuming each second to be received
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • the second receiving end and the target spreading code 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.
  • 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.
  • 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.
  • 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.
  • the transmit signal power of all the receiving ends including the first receiving end and the second receiving end may be updated.
  • 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.
  • the embodiment of the present application provides a specific implementation method of the foregoing channel access method.
  • FIG. 3 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.
  • FIG. 4 is a performance simulation diagram of a multi-user access communication system in an embodiment of the present application.
  • 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.
  • 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 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.
  • 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.
  • FIG. 5 is a functional block diagram of a channel access apparatus according to an embodiment of the present application.
  • 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 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.
  • the access unit 54 is configured to indicate that the second receiving end accesses the channel corresponding to the target spreading code.
  • the second obtaining unit 52 is configured to:
  • 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 third obtaining unit 53 is configured to:
  • 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.
  • the third obtaining unit 53 is further configured to:
  • 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
  • c represents the parameter
  • c is a general spreading code
  • q i / l represents a 1-bit cyclic right shift of the i-th candidate spreading code q i
  • T represents a transposition.
  • 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.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division, and may be implemented in actual implementation.
  • multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented.
  • 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.
  • 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. .

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Abstract

Selon certains modes de réalisation, la présente invention concerne un procédé et un appareil d'accès à un canal. Un aspect des modes de réalisation de la présente invention consiste à : obtenir un code d'étalement utilisé par un premier système, le code d'étalement étant utilisé pour identifier un canal occupé par le premier système, et ainsi obtenir un code d'étalement candidat ; ensuite, obtenir un code d'étalement cible en fonction du code d'étalement candidat et du code d'étalement utilisé par le premier système, le code d'étalement cible étant utilisé pour identifier un canal ayant la plus basse interférence de communication avec le premier système parmi des canaux qui ne sont pas occupés par le premier système ; et enfin, indiquer à un second terminal de réception d'accéder à un canal correspondant au code d'étalement cible. Par conséquent, la solution technique fournie par les modes de réalisation de la présente invention permet de résoudre le problème dans la technologie existante selon lequel l'utilisation de ressources spectrales dans un système de communication est faible.
PCT/CN2016/113236 2016-12-29 2016-12-29 Procédé et appareil d'accès à un canal WO2018119941A1 (fr)

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CN101803432A (zh) * 2007-09-21 2010-08-11 高通股份有限公司 使用功率和衰减曲线的干扰管理
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CN104754702A (zh) * 2013-12-26 2015-07-01 华为技术有限公司 一种随机接入的干扰控制方法、设备及系统

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