WO2014094641A1 - 一种认知无线电系统竞争频谱资源的方法和系统 - Google Patents

一种认知无线电系统竞争频谱资源的方法和系统 Download PDF

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Publication number
WO2014094641A1
WO2014094641A1 PCT/CN2013/090028 CN2013090028W WO2014094641A1 WO 2014094641 A1 WO2014094641 A1 WO 2014094641A1 CN 2013090028 W CN2013090028 W CN 2013090028W WO 2014094641 A1 WO2014094641 A1 WO 2014094641A1
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WIPO (PCT)
Prior art keywords
interference
threshold
working frequency
transmission parameters
intensity
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English (en)
French (fr)
Inventor
李媛媛
蒋成钢
白文岭
杨宇
胡金玲
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method and system for competing a radio frequency system to compete for spectrum resources. Background of the invention
  • the radio communication spectrum is a valuable natural resource. With the rapid development of wireless communication technology, the problem of poor spectrum resources is becoming more and more serious. To alleviate the current situation of spectrum resource shortage, the current monitoring and research of wireless communication spectrum resources has found such as Certain frequency bands, such as the TV band, have not been used for most of the time or have not been used in most areas, and some bands have multiple systems and multiple users competing at the same time, that is, some services have a large capacity. The system does not have enough spectrum resources, and other systems with small capacity are taking up too much resources.
  • cognitive radio Cognitive Radio
  • the basic idea is: Under the premise of not causing interference to the authorization system, the CR system can dynamically monitor the selection gap of the current wireless environment.
  • the frequency band communicates.
  • the protection authorization system is not interfered with.
  • This premise mainly includes: The CR system accurately determines which licensed system bands are available for the white space. The introduction of the CR system does not affect the normal operation of the authorized system; when the occupied frequency band is no longer available, the CR system needs to relinquish these frequency bands to the authorization system in time.
  • the method for determining the blank spectrum resource by the CR system includes: (1) a sensing method, the base station device of the CR system detects the strength of the authorized system signal in a certain frequency band by using a sensing algorithm, and considers the base station device when the strength of the signal is greater than the set threshold value. The distance from the authorized system using this frequency band is too close, and the introduction of the CR system in this frequency band will have an impact on the normal operation of the authorized system. Therefore, the frequency band is not available; (2) Database method, the CR system reads directly from the local database for a specific location, and which frequency bands can be used as blank spectrum resources.
  • the application scenarios of the CR system are mainly divided into two categories.
  • the first type is the spectrum of the opportunistic use authorization system;
  • the second type is the opportunistic use of a certain frequency band by multiple CR systems.
  • a white space band is not affiliated with any one of the systems, and multiple CR systems use a certain white space band fairly, that is, when a certain frequency band is idle, it is called a fair application scenario; or
  • a certain white space is used according to a certain priority.
  • the low priority CR system needs to exit the corresponding white space. This is called an unfair application. Scenes.
  • the service performance of the authorization system or the high priority CR system is required to be guaranteed.
  • the condition is: the CR system accurately determines which frequency bands are available white space bands, that is, Introducing the CR system on these white space bands does not affect the normal operation of the authorized system or higher priority CR system; when the occupied frequency band is no longer available, that is, when the authorized system or higher priority CR system appears, the CR The system needs to relinquish these bands to an authorized system or a higher priority CR system in a timely manner.
  • the listen-before-talk mode that is, before accessing a certain frequency band
  • Interference measurement once it is confirmed that the frequency band is occupied, the frequency band is abandoned and other frequency bands are tried
  • the second is that no measurement is performed, and a certain frequency band is directly occupied, and other frequency bands are tried when it is not working.
  • An embodiment of the present invention provides a method for a cognitive radio system to compete for a spectrum resource.
  • the method can not directly abandon a white space resource when the CR system determines that the used white space resource interference occurs, thereby avoiding users in the CR system. Innocent spectrum switching to improve the performance of the CR system.
  • An embodiment of the present invention provides a system for authenticating a radio system to compete for a spectrum resource, and the system can not directly abandon the white space resource when the CR system determines that the used white space resource interference occurs, so as to avoid the user in the CR system being innocent. Perform spectrum switching to improve the performance of the CR system.
  • a method for a cognitive radio system to compete for spectrum resources including:
  • the cognitive radio CR system acts as the interference system and occupies the working frequency of the victim system.
  • the CR system detects the interference at the working frequency occupied by the CR system, and obtains the energy average of the first interference sample.
  • the transmission parameter is adjusted to the optimal transmission parameter, and the working frequency point is continuously occupied;
  • the setting of the first interference threshold is: the transmission parameter of the CR system is adjusted to detect the transmission parameter used by the interference of the CR system, and the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work. , using the specified interference strength Setting a first interference threshold;
  • the setting of the second interference threshold is: when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified
  • the interference strength sets a second interference threshold.
  • the method also includes:
  • the CR system determines that the first interference sample energy average is less than the set first interference threshold, the CR system continues to occupy the working frequency point;
  • the CR system determines that the first interference sample energy average value is not less than the set second interference threshold, and exits the working frequency point.
  • the method also includes:
  • the CR system After waiting for the set time, the CR system detects the interference at the occupied working frequency point, and obtains the average value of the second interference sample energy;
  • the CR system determines whether the average value of the second interference sample energy is less than the set third interference threshold, and if so, the transmission parameter of the CR system is adjusted to the optimal transmission parameter; otherwise, the CR system exits the working frequency point;
  • the setting of the third interference threshold is: when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified The interference strength sets the third interference threshold.
  • the transmission parameters of the CR system are adjusted to the optimal transmission parameters as follows:
  • the CR system increases the transmit power of the network side to the maximum transmit power
  • the process of obtaining the first interference sample energy average or the second interference sample energy average is:
  • the CR system detects the interference system at the working frequency point within a preset measurement time Obtaining a signal power of a plurality of sampling points in the preset measurement time, and smoothing signal power of the plurality of sampling points to obtain an energy average value of the first interference sample or energy of the second interference sample average value.
  • the interference system smoothes the signal power of the plurality of sampling points, and specifically includes:
  • the interference system is smoothed by the following formula:
  • N the number of detection periods
  • a system for cognitive radio systems to compete for spectrum resources including:
  • the interference detecting unit is configured to occupy the working frequency of the victim system; and detect interference at the working frequency occupied by the interference, and obtain an average energy value of the first interference sample;
  • the first interference threshold setting unit is configured to adjust a transmission parameter of the CR system to a transmission parameter used for detecting interference of the CR system, and the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work. , setting a first interference threshold by using the specified interference intensity;
  • the second interference threshold setting unit is configured to: when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified The interference strength is set to a second interference threshold; the interference determining unit is configured to determine whether the average energy of the first interference sample is not less than the set first interference threshold and less than the set second interference threshold;
  • a transmission parameter adjustment unit configured to: when the interference determination unit determines that the first interference sample energy average value is not less than the set first interference threshold, and is less than the set second interference threshold, The transmit parameters are adjusted to the optimal transmit parameters and continue to occupy the operating frequency.
  • the interference processing unit is further configured to: when the interference determining unit determines that the first interference sample energy average value is less than the set first interference threshold, does not adjust the transmission parameter, and continues to occupy the working frequency point; when the interference determination unit determines When the average value of the interference sample energy is not less than the set second interference threshold, the working frequency point is exited.
  • the method further includes: a third interference threshold setting unit, when the transmission parameter of the CR system is adjusted to an optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the The specified interference intensity sets a third interference threshold;
  • the interference detecting unit is further configured to detect the interference at the occupied working frequency point after waiting for the set time, and obtain an average value of the second interference sample energy;
  • the interference judging unit is further configured to determine whether the average value of the second interference sample energy is less than the set third interference threshold;
  • the transmission parameter adjustment unit is further configured to: when the interference determination unit determines that the second interference sample energy average value is less than the set third interference threshold, adjust the transmission parameter of the CR system to an optimal transmission parameter;
  • the interference processing unit is further configured to: when the interference determining unit determines that the second interference sample energy average value is not less than the set third interference threshold, exiting the working frequency point.
  • the transmitting parameter adjusting unit is specifically configured to adjust the transmitting parameter of the CR system to an optimal transmitting parameter by one or any combination of the following manners:
  • the interference detecting unit is specifically configured to detect interference of the interference system at the working frequency point within a preset measurement time, and obtain multiple sampling points in the preset measurement time. Signal power, and smoothing the signal power of the plurality of sampling points to obtain a first interference sample energy average or a second interference sample energy average.
  • the interference detecting unit is further configured to perform smoothing by using the following formula:
  • N the number of detection periods
  • a system for a cognitive radio system to compete for spectrum resources comprising: a central processing unit and a storage unit, wherein
  • the central processing unit is configured to adjust the transmission parameter of the CR system to use the transmission parameter used to detect the interference of the CR system.
  • the CR system can work. Otherwise, the CR system cannot work.
  • the specified interference intensity sets the first interference threshold and is stored in the storage unit;
  • the CR system can work when the current interference intensity is not greater than the specified interference intensity. Otherwise, if the CR system fails to work, the second interference is set by using the specified interference intensity. Threshold, stored in the storage unit;
  • the storage unit For occupying the working frequency of the victim system; detecting interference at the working frequency occupied by the interference, obtaining an average value of the energy of the first interference sample; determining whether the average energy of the first interference sample is not less than a first interference threshold stored by the storage unit And being less than the second interference threshold stored by the storage unit, if yes, adjusting the transmission parameter to the optimal transmission parameter, continuing to occupy the working frequency point; and the storage unit, configured to store the first interference threshold and the second interference threshold.
  • the central processing unit is further configured to: when the interference determining unit determines that the first interference sample energy average value is less than the set first interference threshold, does not adjust the transmission parameter, and continues to occupy the working frequency point; when the interference determination unit determines The average value of the first interference sample energy is not less than the setting When the second interference threshold is reached, the working frequency is exited.
  • the central processing unit when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified interference is utilized.
  • the third interference threshold is set in the storage unit, and is stored in the storage unit; the interference at the working frequency point is detected after waiting for the set time, and the average energy of the second interference sample is obtained; determining whether the average energy of the second interference sample is less than the storage a third interference threshold stored by the unit, if yes, adjusting a transmission parameter of the CR system to an optimal transmission parameter; if not, exiting the working frequency point;
  • the storage unit is further configured to store a third interference threshold.
  • the embodiment of the present invention has at least the following advantages:
  • the CR system when detecting interference on the working frequency band resource, the CR system adjusts the transmission parameter of the CR system to force the working frequency band resource.
  • the other CR system exits the working frequency point, so that when the CR system determines that the used white space resource interference occurs, the blank frequency band resource is not directly discarded, so as to avoid interference of the user in the system to perform spectrum switching and improve the performance of the interference system.
  • FIG. 1 is a flow chart of a method for competing for spectrum resources of a CR system according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for competing for spectrum resources of a cognitive radio system according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a CR system for competing spectrum resources of a cognitive radio system according to Embodiment 3 of the present invention.
  • the CR system of the present invention adjusts the transmission parameters of the CR system by detecting the transmission parameters of the CR system to force other CR systems on the working frequency band to exit the working frequency point, and the CR system Switching of band resources is not performed directly.
  • FIG. 1 is a flowchart of a method for competing for spectrum resources of a CR system according to an embodiment of the present invention, where specific steps are as follows:
  • Step 101 The CR system acts as an interference system and occupies the working frequency of the victim system. In this step, the CR system may not perform interference detection when occupying the channel of the working frequency of the victim system;
  • Step 102 The CR system detects interference on the occupied working frequency point, and obtains an average value of the first interference sample energy
  • Step 103 the CR system determines whether the first interference sample energy average is not less than the set first interference threshold, and is less than the set second interference threshold, and if so, step 104 is performed; if not, step 105 is performed;
  • the setting of the first interference threshold is: the transmission parameter of the CR system is adjusted to detect the transmission parameter used by the interference of the CR system, and the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work. And setting a first interference threshold by using the specified interference intensity;
  • the setting of the second interference threshold is: when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified The interference strength sets a second interference threshold; Step 104, the CR system adjusts the transmission parameter to an optimal transmission parameter, and continues to occupy the working frequency point;
  • Step 105 the CR system determines whether the first interference sample energy average is less than the set first interference threshold, and if so, step 106 is performed; if not, then not less than the set second interference threshold, step 107;
  • Step 106 The CR system does not adjust the transmission parameters, and continues to occupy the working frequency point.
  • Step 107 The CR system exits the working frequency point.
  • the method further includes:
  • the CR system After waiting for the set time, the CR system detects the interference at the occupied working frequency point, obtains the average value of the second interference sample energy, and determines whether the average value of the second interference sample energy is less than the set third interference threshold, and if so, The transmission parameter of the CR system is adjusted to the optimal transmission parameter; if not, the CR system exits the working frequency point;
  • the setting of the third interference threshold is: when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified The interference strength sets the third interference threshold.
  • Embodiment 1 of the present invention provides a method for a CR system to compete for spectrum resources, and the present invention
  • the system that has occupied a certain frequency point is a victim system
  • the frequency point is also a channel
  • the frequency point is the working frequency point of the victim system
  • the other CR system accessing the frequency point is an interference system. That is, the CR system proposed by the present invention.
  • the victim system is working at a frequency, such as a frequency point fl
  • the interference system starts working at the working frequency of the victim system without performing interference detection on the working frequency of the victim system;
  • the method includes the following steps:
  • Step 201 The interference system directly occupies the working frequency point and operates at the working frequency point without performing interference detection on the working frequency point.
  • the occupied frequency is actually the channel occupying the working frequency; in this step, the working frequency is the working frequency of the victim system.
  • Step 202 The interference system detects the interference situation of the interference system at the working frequency point, and obtains an average value of the first interference sample energy.
  • the interference system in the process of interference detection, in order to avoid interference of the signal of the interference system to the measurement, it is necessary to set a measurement time, that is, a preset measurement time, and detect the interference frequency of the interference system in the preset measurement time.
  • a measurement time that is, a preset measurement time
  • the interference system needs to stop all transmissions at the working frequency point.
  • the interference system needs to recover all the transmissions at the working frequency point; Based on this, the interference system detects the interference situation of the interference system at the working frequency point, and obtains the average energy value of the first interference sample: the interference system detects the interference situation of the interference system at the working frequency point within the preset measurement time, and obtains Predetermining the signal power of multiple sampling points in the measurement time, that is, multiple detection samples, and smoothing the signal power of the plurality of sampling points to obtain the average energy of the first interference sample.
  • the interference system smoothes the signal power of the plurality of sampling points, and may smooth the signal power of the plurality of sampling points at the working frequency point obtained in one detection period; or, Multiple at the working frequency points obtained during the detection period
  • the signal power of the sampling point is smoothed; for example: the detection period is 20ms, and the detection at the working frequency point is completed by X ms every 20ms.
  • the first method is to perform smooth statistics only on the detection samples within 20ms; One way is to perform smooth statistics on multiple 20ms test samples.
  • the interference system smoothes the signal power of the multiple sampling points, and the following includes:
  • the interference system smoothes the signal power of the multiple sampling points by using the following formula:
  • N the number of detection periods
  • Step 203 The interference system determines whether the average energy of the first interference sample is less than a preset first interference threshold. When the first interference sample energy average is less than the preset first interference threshold, step 204 is performed; when the first interference sample energy averages When the value is not less than the preset first interference threshold, step 205 is performed.
  • the setting manner of the preset first interference threshold specifically includes: but is not limited to: when the interference system adjusts the transmission parameter of the interference system to detect the interference condition of the interference system, When the current interference intensity is not greater than the specified interference intensity, the interference system can work under the current interference intensity, and when the current interference intensity is greater than the specified interference intensity, the interference system cannot work under the current interference intensity, then the specified interference intensity can be used to preset Set the first interference threshold.
  • Step 204 The interference system determines that the interference system continues to work at the working frequency.
  • the interference system when the average energy of the first interference sample is less than the preset first interference threshold, the interference system may moderately adjust the transmission parameter, and continue to be the most at the working frequency.
  • the matching transmission parameters work; wherein, the interference system moderately adjusts the transmission parameters specifically: the interference system selects an appropriate transmission parameter according to the interference situation to work, and the transmission power does not need to be adjusted to the maximum allowed transmission power value, and does not necessarily need to be reduced. Modulation coding mode level, etc.
  • Step 205 The interference system determines whether the average energy of the first interference sample is less than a preset second interference threshold. When the average energy of the first interference sample is less than the preset second interference threshold, step 206 is performed; When the value is not less than the preset second interference threshold, step 207 is performed.
  • the setting manner of the preset second interference threshold specifically includes: but is not limited to: adjusting, in the interference system, a transmission parameter of the interference system as an optimal transmission parameter, for example, adjusting a transmission power to a maximum, and/or starting Beamforming technology, and/or, when the modulation coding mode level is reduced to the lowest level, when the current interference intensity is not greater than the specified interference intensity, the interference system can work under the current interference intensity, and when the current interference intensity is greater than the specified interference intensity If the interference system is unable to work under the current interference intensity, the second interference threshold may be preset by using the specified interference intensity setting.
  • Step 206 The interference system adjusts the transmission parameters of the interference system and continues to work at the working frequency.
  • the interference system adjusts the transmission parameters of the interference system, including but not limited to: the interference system adjusts the transmission parameters of the interference system to the optimal transmission parameters by one or any combination of the following manners: The transmission power to the maximum transmission power; the interference system starts the beamforming technology; the interference system reduces the modulation coding mode level to the lowest level.
  • the interference system can broadcast the corresponding information to the user equipment through a common channel such as a broadcast channel; Modulation coding mode level is the most When the level is low, the interference system can directly notify the user equipment of the corresponding information through dedicated signaling.
  • Step 207 the interference system exits the working frequency point, and shifts to work at the alternate frequency point.
  • the interference system starts from adjusting the transmission parameter of the interference system, and after the preset waiting time, detects the interference situation of the interference system at the working frequency point, and obtains the energy average of the second interference sample. And comparing the energy average of the second interference sample with the preset third interference threshold; when the average energy of the second interference sample is less than the preset third interference threshold, the interference system adjusts the transmission parameter of the interference system according to the current interference situation.
  • the interference system needs to maintain the operation with the optimal transmission parameter at all times, thereby increasing the energy consumption, so the interference The system needs to exit the working frequency point and transfer to the alternate frequency point to work.
  • the setting manner of the preset third interference threshold specifically includes, but is not limited to: adjusting the transmission parameter of the interference system in the interference system to optimize the performance of the interference system, that is, the interference system continues to improve the transmission parameters.
  • the interference system will cause a large loss, and the loss may be energy loss or equipment loss.
  • the gains obtained by the interference system may be system capacity, system throughput, dropped call rate or number of access users.
  • the third interference threshold can be preset using the specified interference strength setting.
  • the foregoing step that is, when the average value of the second interference sample energy is less than the preset third interference threshold, the interference system continues to operate at the working frequency; when the second interference When the average value of the sample energy is not less than the preset third interference threshold, the interference system needs to exit the working frequency point, thereby ensuring the optimal performance of the interference system.
  • the process of interference detection in order to avoid interference of the signal of the interference system to the measurement, it is necessary to set a preset measurement time, and detect the interference situation of the interference system at the working frequency point within the preset measurement time. And within a preset measurement time, the interference system needs to stop all transmissions at the working frequency point.
  • the interference system After the preset measurement time ends, the interference system needs to recover all transmissions at the working frequency point; based on this, the interference system Detecting the interference situation of the interference system at the working frequency point, and obtaining the average energy value of the second interference sample includes: The interference system detects the interference situation of the interference system at the working frequency point within the preset measurement time, and obtains the preset measurement time. The signal power of a plurality of sampling points, that is, a plurality of detection samples, and smoothing the signal power of the plurality of sampling points to obtain an average value of the second interference sample energy.
  • the interference system smoothes the signal power of the plurality of sampling points, and may smooth the signal power of the plurality of sampling points at the working frequency point obtained in one detection period; or, The signal power of multiple sampling points at the working frequency point obtained during the detection period is smoothed; for example: the detection period is 20ms, and every 20ms, the detection at the working frequency point is completed by X ms.
  • the first way is Smooth statistics are only performed on the detected samples within 20 ms; the second method is to perform smooth statistics on multiple 20 ms test samples.
  • the interference system smoothes the signal power of the multiple sampling points, and the following includes:
  • the interference system smoothes the signal power of the multiple sampling points by using the following formula:
  • N the number of detection periods, and N is a positive integer .
  • the interference system is dry on the detected working frequency.
  • the transmission parameters of the interference system are adjusted to force the victim system to exit the working frequency point, thereby avoiding the user's innocent spectrum switching in the interference system and improving the system performance of the interference system.
  • the cognitive radio systems CRS1 and CRS2 share the frequency band X fairly, and there are three frequency points on the frequency band X, and the three frequency points are fl, f2, and f3, respectively.
  • the current working system is CRS1, that is, the victim system, the working frequency is fl, the first alternate frequency is f2, the maximum transmit power of the base station equipment is P_base_CRS1, and the maximum allowable transmit power of the user equipment is P_UE_CRS1, and the downlink modulation coding mode level Divided into three, respectively, Modulation and Coding Style (MCS), MCS Level 2 and MCS Level 3, MCS Level 1 is lower than MCS Level 2, MCS Level 2 is lower than MCS Level 3, and high
  • MCS Modulation and Coding Style
  • MCS Level 1 is lower than MCS Level 2
  • MCS Level 2 is lower than MCS Level 3
  • the level modulation coding mode uses a lower coding rate and a higher modulation mode; the modulation coding mode level of the downlink service of a UE operating in CRS1 is MCS level 3.
  • the modulation coding mode level is divided into three types, MCS level 1, MCS level 2 and MCS level 3, MCS level 1 is lower than MCS level 2, MCS level 2 is lower than MCS level 3, and high level modulation coding mode, The coding rate adopted is lower, and the modulation mode is higher.
  • the modulation coding mode level of the downlink service of a user equipment working in CRS2 is MCS level 3.
  • CRS2 in the case that CRS2 does not perform interference detection on fl, CRS2 directly occupies the channel of fl and works on fl.
  • the CRS2 detects the interference condition on the fl, and obtains the signal power of the plurality of sampling points in the measurement time, assuming that the sampling points on the fl in one detection period are nl; The signal power of the sampling point is smoothed to obtain an average value of the first interference sample energy.
  • the CRS2 compares the first interference sample energy average value with the preset first interference threshold; when the first interference sample energy average value is less than the preset first interference threshold, the CRS2 can moderately adjust the transmission parameter. And continue to work on the fl with the best matching transmission parameters; and CRS2 adjusts the transmission parameters specifically: CRS2 selects the appropriate transmission parameters according to the interference situation to work, at this time, the transmission power does not need to be adjusted to the maximum allowable transmission power value, not necessarily It is necessary to reduce the modulation coding mode level and the like; for example, the CRS2 can still use the MCS level 3 according to the interference situation, but since the UE moves to the base station device, the transmission power is reduced to P_UE.
  • the CRS2 compares the first interference sample energy average with the preset second interference threshold; when the first interference sample energy average is not less than the preset second interference At the threshold, CRS2 exits the working frequency and moves to the first alternate frequency to work.
  • the CRS2 adjusts the CRS2 transmission parameter to an optimal transmission parameter, such as: the transmit power is adjusted to the maximum, and/or, the start beamforming technique, and/or, Reduce the modulation coding mode level to the lowest level and continue to work on fl.
  • the CRS2 starts from adjusting the transmission parameter to the optimal transmission parameter, and the CRS2 needs to detect the interference condition on the fl after the preset waiting time, and obtains the signal power of the multiple sampling points in the measurement time, assuming that the detection period is within the fl.
  • the sampling points are nl; the average value of the second interference sample energy is obtained by smoothing the signal power of the plurality of sampling points.
  • CRS2 performs smoothing processing using the following formula to obtain an average value of the second interference sample energy on fl: P_md Pi . , wherein only one detection week is selected
  • n l ⁇ J , j is the signal power at each sampling point.
  • the CRS2 compares the second interference sample energy average with the preset third interference threshold; when the second interference sample energy average is not less than the preset third interference threshold, the CRS2 needs to maintain the operation with the optimal emission parameter, increasing the Energy consumption, therefore CRS2 needs to exit fl and transfer to the first alternate frequency point; when the second interference sample energy average is less than the preset third interference threshold, CRS2 adjusts the transmission parameters according to the current interference situation, and continues to be in fl Working with the most matching transmission parameters; the method of adjusting the transmission parameters is similar to the current general method. For example, when the distance between the UE and the base station device becomes close, the transmission power of the small UE can be adjusted, and the modulation coding mode level of the data service is increased. Wait.
  • an embodiment of the present invention further provides an interference system for recognizing a spectrum in a radio system.
  • the system includes:
  • the interference detecting unit 11 is configured to occupy a working frequency of the victim system; and detect interference at the working frequency occupied by the interference, and obtain an average energy of the first interference sample;
  • the first interference threshold setting unit 110 is configured to adjust a transmission parameter of the CR system to use a transmission parameter used to detect interference of the CR system, where the current interference intensity is not greater than the specified interference At the time of strength, the CR system can work. Otherwise, the CR system cannot work, and the first interference threshold is set with the specified interference intensity;
  • the second interference threshold setting unit ill when the transmission parameter of the CR system is adjusted to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work, and the specified
  • the interference strength sets a second interference threshold
  • the interference judging unit 12 is configured to determine whether the average energy of the first interference sample is not less than the set first interference threshold and less than the set second interference threshold;
  • the transmitting parameter adjusting unit 14 is configured to adjust the transmitting parameter to the optimal transmitting parameter when the interference determining unit 12 determines that the first interference sample energy average value is not less than the set first interference threshold and is less than the set second interference threshold. , continue to occupy the working frequency.
  • the interference processing unit 13 is further configured to: when the interference determining unit 12 determines that the first interference sample energy average value is less than the set first interference threshold, does not adjust the transmission parameter, and continues to occupy the working frequency. Point; when the interference judging unit 12 judges that the first interference sample energy average value is not less than the set second interference threshold, the working frequency point is exited.
  • the method further includes: a third interference threshold setting unit 112, when the transmission parameter of the CR system is adjusted to an optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity, otherwise, If the CR system is inoperable, the third interference threshold is set using the specified interference strength;
  • the interference detecting unit 11 is further configured to detect interference at the occupied working frequency point after waiting for the set time, and obtain an average value of the second interference sample energy;
  • the interference determining unit 12 is further configured to determine whether the average energy of the second interference sample is smaller than the third interference threshold that is set;
  • the transmission parameter adjustment unit 14 is further configured to: when the interference determination unit 12 determines that the second interference sample energy average value is less than the set third interference threshold, adjust the transmission parameter of the CR system
  • the interference processing unit 13 is further configured to: when the interference determining unit 12 determines that the second interference sample energy average value is not less than the set third interference threshold, exiting the working frequency point.
  • the interference detecting unit 11 is configured to occupy a channel of the working frequency point and perform operation at the working frequency point without performing interference detection on a working frequency point of the victim system; and detecting the interference system Observing the interference condition at the working frequency point, obtaining an average energy value of the first interference sample;
  • the interference judging unit 12 is configured to compare the first interference sample energy average value with a preset first interference threshold; and when the first interference sample energy average value is not less than the preset first interference threshold, compare the The first interference sample energy average value and the preset second interference threshold; the interference processing unit 13 is configured to: when the first interference sample energy average value is less than the preset first interference threshold, determine that the interference system continues to be in the Working at a working frequency point; when the first interference sample energy average is less than the preset second interference threshold, determining to continue to work at the working frequency point; when the first interference sample energy average is not When the preset second interference threshold is less than, the working frequency point is exited;
  • the transmission parameter adjustment unit 14 is configured to adjust a transmission parameter of the interference system when the first interference sample energy average value is less than the preset second interference threshold.
  • the setting of the preset first interference threshold by the interference processing unit 13 is: when the interference system adjusts the transmission parameter of the interference system to detect the interference condition of the interference system, at the current When the interference intensity is not greater than the specified interference intensity, the interference system can work under the current interference intensity, and when the current interference intensity is greater than the specified interference intensity, the interference system cannot work under the current interference intensity, and the designation is utilized.
  • the interference strength sets the preset first interference threshold.
  • the setting manner of the preset second interference threshold by the interference processing unit 13 is: When the interference system adjusts the transmission parameter of the interference system to be the optimal transmission parameter, when the current interference intensity is not greater than the specified interference intensity, the interference system can work under the current interference intensity, and the current interference intensity is greater than the specified interference intensity. And the interference system is unable to work under the current interference intensity, and the preset second interference threshold is set by using the specified interference intensity.
  • the transmitting parameter adjusting unit 14 is configured to: when the first interference sample energy average value is less than the preset second interference threshold, adjust the emission parameter of the interference system to the most Good emission parameters:
  • the interference detecting unit 11 is further configured to: after adjusting a transmission parameter of the interference system, after the preset waiting time, detecting interference of the interference system at the working frequency point, and obtaining an energy average of the second interference sample. ;
  • the interference determining unit 12 is further configured to compare the energy average of the second interference sample with a preset third interference threshold;
  • the transmitting parameter adjusting unit 14 is further configured to: when the average value of the second interference sample energy is less than the preset third interference threshold, adjust the transmission parameter of the interference system according to the current interference condition;
  • the interference processing unit 13 is further configured to continue to work at the working frequency when the second interference sample energy average is less than the preset third interference threshold; and when the second interference sample energy averages When the value is not less than the preset third interference threshold, the working frequency point is exited.
  • Setting the preset third interference threshold by the interference processing unit 13 is: adjusting the transmission parameter of the interference system in the interference system to optimize the performance of the interference system.
  • the interference system can work under the current interference intensity, and when the current interference intensity is greater than the specified interference intensity, the interference system cannot work under the current interference intensity.
  • setting the preset third interference threshold by using the specified interference strength.
  • the interference detecting unit 11 is configured to detect interference of the interference system at the working frequency point within a preset measurement time, and obtain signal power of multiple sampling points in the preset measurement time, and The signal powers of the plurality of sampling points are smoothed to obtain a first interference sample energy average or a second interference sample energy average.
  • the interference detecting unit 11 is further configured to perform smoothing processing by using the following formula:
  • N the number of detection periods
  • the modules of the system of the present invention may be integrated into one or may be deployed separately.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • An embodiment of the present invention further provides a system for competing a spectrum resource of a cognitive radio system, including: a central processing unit and a storage unit, where
  • the central processing unit is configured to adjust the transmission parameter of the CR system to use the transmission parameter used to detect the interference of the CR system.
  • the CR system can work. Otherwise, the CR system cannot work.
  • the specified interference intensity sets the first interference threshold and is stored in the storage unit;
  • the CR system can work when the current interference intensity is not greater than the specified interference intensity. Otherwise, the CR system cannot work. And using the specified interference intensity to set a second interference threshold, stored in the storage unit; for occupying the working frequency of the victim system; detecting interference at the occupied working frequency point, obtaining an average value of the first interference sample energy; Determining whether the average energy of the first interference sample is not less than a first interference threshold stored by the storage unit, and smaller than a second interference threshold stored by the storage unit, and if yes, adjusting the transmission parameter to an optimal transmission parameter, continuing to occupy the working frequency a storage unit, configured to store a first interference threshold and a second interference threshold.
  • the central processing unit is further configured to: when the interference determining unit determines that the first interference sample energy average value is less than the set first interference threshold, does not adjust the transmission parameter, and continues to occupy the working frequency point.
  • the interference judging unit judges that the first interference sample energy average value is not less than the set second interference threshold, the working frequency point is exited.
  • the CR system when the central processing unit is used to adjust the transmission parameter of the CR system to the optimal transmission parameter, the CR system can work when the current interference intensity is not greater than the specified interference intensity; otherwise, the CR system cannot work. And using the specified interference intensity to set a third interference threshold, stored in the storage unit; detecting the interference at the occupied working frequency point after waiting for the set time, obtaining an average value of the second interference sample energy; determining the second interference sample Whether the average value of the energy is smaller than a third interference threshold stored by the storage unit, and if yes, adjusting a transmission parameter of the CR system to an optimal transmission parameter; if not, exiting the working frequency point;
  • the storage unit is further configured to store a third interference threshold.
  • the solution provided by the present invention can be applied to the fair application scenario of the second application scenario.
  • the direct occupation of a certain frequency band without any measurement obviously causes the mutual interference phenomenon to occur. It can also be performed when interference occurs in the CR system that has occupied the white space resource, and is not limited herein.
  • the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium, and includes a plurality of instructions for causing a computer device (may be It is a personal computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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Abstract

本发明公开了一种认知无线电系统竞争频谱资源的方法和系统,CR系统在检测到工作频段资源上发生干扰时,通过调整本CR系统的发射参数,以迫使该工作频段资源上的其他CR系统退出该工作频点,从而在CR系统确定所使用的空白频段资源干扰发生时,不直接放弃空白频段资源,以避免干扰系统内的用户无辜的进行频谱切换,提高干扰系统性能。

Description

一种认知无线电系统竟争频谱资源的方法和系统 技术领域
本发明涉及了通信技术领域, 尤其是涉及了一种认知无线电系统竟 争频谱资源的方法和系统。 发明背景
无线电通信频谱是宝贵的自然资源, 随着无线通信技术的飞快发 展, 频谱资源贫乏的问题日益严重, 为緩解频谱资源紧张的现状, 当前 对无线通信频谱资源进行了监测和研究后, 发现出现诸如电视频段等某 些频段在大多数时间内并未使用或在大多数地域内并未使用, 而某些频 段出现多系统多用户同时竟争的情况, 也就是出现某些业务承载量很大 的系统没有足够频谱资源, 另一些业务承载量不大的系统却占用太多资 源的情况。 认知无线电 (CR, Cognitive Radio ) 系统的概念正是在这种 背景下产生的, 其基本思想是: 在不对授权系统造成干扰的前提下, CR 系统通过监测当前无线环境的变化动态的选择空白频段进行通信。
当 CR系统机会性使用授权系统的空白频段时,保护授权系统不受干 扰^ ^本前提, 这种保护主要包含: CR系统准确判断出哪些授权系统的 频段是可用的空白频段,在这些空白频段上引入 CR系统不会影响授权系 统的正常工作; 当占用频段不再可用时, CR系统需要及时的将这些频段 退让给授权系统。
CR系统确定空白频谱资源的方法包括: (1 )感知方法, CR系统的 基站设备通过感知算法检测某频段上授权系统信号的强度, 当信号的强 度大于设置的门限值时, 认为该基站设备距离使用这个频段的授权系统 距离过近, 在此频段上引入 CR系统会对授权系统的正常工作产生影响, 因此该频段不可用; ( 2 )数据库方法, CR系统从本地数据库中直接读取 针对某具体位置, 哪些频段作为空白频谱资源可以使用。
CR系统的应用场景主要分为两大类,第一类为机会式使用授权系统 的频谱; 第二类为多个 CR系统机会式使用某个频段。在第二类应用场景 中, 某个空白频段不隶属于任何一个系统, 多个 CR系统公平的使用某个 空白频段, 即当某个频段空闲时即可使用, 称为公平式应用场景; 或按 一定的优先级使用某个空白频段,即当某个优先级较高的 CR系统使用某 个空白频段时,低优先级的 CR系统则需要退出相应空白频段的使用, 称 为非公平式应用场景。
对于第一类应用场景和第二类应用场景的非公平式应用场景, 要求 保障授权系统或者高优先级 CR系统的业务性能, 条件为: CR系统准确 判断出哪些频段是可用的空白频段,即在这些空白频段上引入该 CR系统 不会影响授权系统或更高优先级的 CR系统的正常工作;当占用频段不再 可用时, 即授权系统或更高优先级的 CR系统出现时, 该 CR系统需要及 时的将这些频段退让给授权系统或更高优先级的 CR系统。
对于第二类应用场景的公平式应用场景, 在接入某个频段时, 目前 存在如下两种方式: 第一种是 listen-before-talk的方式, 即在接入某个频 段之前, 先进行干扰测量, 一旦确认该频段被占用, 则放弃该频段, 尝 试其他频段; 第二种是不进行任何测量, 直接占用某个频段, 当不能工 作时再尝试其他频段。
在实现本发明的过程中, 发明人发现现有技术中至少存在以下问 题:
对于已经占用空白频段资源的 CR系统来说, 如果发生干扰, 就会直 接放弃对本频段的使用。 特别是对于第二类应用场景的公平式应用场 景, 当采用第二种方式接入的 CR系统来说, 不经过任何测量直接占用某 个频段显然会导致互干扰现象的发生,采用第二种方式接入的 CR系统如 果直接放弃对本频段的使用。但是, 当前占用空白频段资源的 CR系统当 检测到干扰发生时直接放弃空白频段资源时,对该 CR系统内的用户是不 公平的, 该 CR系统内的用户需要无辜地进行频谱资源切换, 对该 CR系 统的性能带来不良影响。 发明内容
本发明实施例提供一种认知无线电系统竟争频谱资源的方法, 该方 法能够在 CR系统确定所使用的空白频段资源干扰发生时, 不直接放弃 空白频段资源, 以避免该 CR系统内的用户无辜的进行频谱切换, 提高 该 CR系统性能。
本发明实施例提供一种认证无线电系统竟争频谱资源的系统, 该系 统能够在 CR系统确定所使用的空白频段资源干扰发生时, 不直接放弃 空白频段资源, 以避免该 CR系统内的用户无辜的进行频谱切换, 提高 该 CR系统性能。
为了达到上述目的, 本发明是这样实现的:
一种认知无线电系统竟争频谱资源的方法, 包括:
认知无线电 CR系统作为干扰系统, 占用受扰系统的工作频点; CR 系统检测所占用的工作频点上的干扰, 得到第一干扰样本能量 平均值, 当判断第一干扰样本能量平均值不小于所设置的第一干扰门 限, 且小于设置的第二干扰门限时, 将发射参数调整为最佳发射参数, 继续占用所述工作频点;
所述第一干扰门限的设置为: CR系统的发射参数调整为检测 CR系 统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度 设置第一干扰门限;
所述第二干扰门限的设置为: CR 系统的发射参数调整为最佳发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限。
该方法还包括:
CR 系统确定第一干扰样本能量平均值小于所设置的第一干扰门限 时, 继续占用所述工作频点;
CR系统确定第一干扰样本能量平均值不小于设置的第二干扰门限, 退出所述工作频点。
方法还包括:
CR 系统在等待设置的时间后, 检测所占用的工作频点上的干扰, 得到第二干扰样本能量平均值;
CR 系统判断第二干扰样本能量平均值是否小于所设置的第三干扰 门限, 如果是, CR 系统的发射参数调整为最优发射参数; 否则, CR 系统退出所述工作频点;
所述第三干扰门限的设置为: CR 系统的发射参数调整为最优发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第三干扰门限。
所述 CR系统的发射参数调整为最佳发射参数为:
所述 CR系统提高网络侧的发射功率至最大发射功率;
或 /和所述 CR系统启动波束赋形技术;
或 /和所述 CR系统降低调制编码模式等级为最低等级。
所述得到第一干扰样本能量平均值或者第二干扰样本能量平均值 的过程为:
所述 CR系统在预设测量时间内检测本干扰系统在所述工作频点上 的干扰情况, 得到所述预设测量时间内的多个采样点的信号功率, 并对 所述多个采样点的信号功率进行平滑处理, 得到第一干扰样本能量平均 值或者第二干扰样本能量平均值。
所述干扰系统对所述多个采样点的信号功率进行平滑处理, 具体包 括:
所述干扰系统通过如下公式进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 其中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测 周期内, 第 j个采样点的信号功率, N表示检测周期的数量。
一种认知无线电系统竟争频谱资源的系统, 包括:
干扰检测单元, 用于占用受扰系统的工作频点; 以及检测所占用的 工作频点上的干扰, 得到第一干扰样本能量平均值;
第一干扰门限设置单元,用于将 CR系统的发射参数调整为检测 CR 系统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度 时, CR系统能够工作, 否则, CR系统无法工作, 利用所指定的干扰强 度设置第一干扰门限;
第二干扰门限设置单元, 用于 CR系统的发射参数调整为最佳发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限; 干扰判断单元, 用于判断第一干扰样本能量平均值是否不小于所设 置的第一干扰门限, 且小于设置的第二干扰门限;
发射参数调整单元, 用于当干扰判断单元判断第一干扰样本能量平 均值不小于所设置的第一干扰门限, 且小于设置的第二干扰门限时, 将 发射参数调整为最佳发射参数, 继续占用所述工作频点。
还包括干扰处理单元, 用于当干扰判断单元判断第一干扰样本能量 平均值小于所设置的第一干扰门限时, 对发射参数不调整, 继续占用所 述工作频点; 当干扰判断单元判断第一干扰样本能量平均值不小于设置 的第二干扰门限时, 退出工作频点。
还包括: 第三干扰门限设置单元, 用于 CR系统的发射参数调整为 最优发射参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能 够工作, 否则, CR 系统无法工作, 则利用所指定的干扰强度设置第三 干扰门限;
干扰检测单元, 还用于在等待设置的时间后检测所占用的工作频点 上的干扰, 得到第二干扰样本能量平均值;
干扰判断单元, 还用于判断第二干扰样本能量平均值是否小于所设 置的第三干扰门限;
发射参数调整单元, 还用于当干扰判断单元判断第二干扰样本能量 平均值小于所设置的第三干扰门限, 将 CR系统的发射参数调整为最优 发射参数;
干扰处理单元, 还用于当干扰判断单元判断第二干扰样本能量平均 值不小于所设置的第三干扰门限, 退出工作频点。
所述发射参数调整单元, 具体用于通过如下方式之一或任意组合将 CR系统的发射参数调整为最佳发射参数:
提高网络侧的发射功率至最大发射功率;
启动波束赋形技术;
降低调制编码模式等级为最低等级。
所述干扰检测单元, 具体用于在预设测量时间内检测本干扰系统在 所述工作频点上的干扰情况, 得到所述预设测量时间内的多个采样点的 信号功率, 并对所述多个采样点的信号功率进行平滑处理, 得到第一干 扰样本能量平均值或者第二干扰样本能量平均值。
所述干扰检测单元, 进一步用于通过如下公式进行平滑处理:
P _ mean ^— ~ ·
∑nt , 其中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测 周期内, 第 j个采样点的信号功率, N表示检测周期的数量。
一种认知无线电系统竟争频谱资源的系统, 包括: 中央处理单元及 存储单元, 其中,
中央处理单元, 用于将 CR系统的发射参数调整为检测 CR系统的 干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR 系统无法工作, 利用所指定的干扰强度设置 第一干扰门限, 存储到存储单元中;
用于将 CR系统的发射参数调整为最佳发射参数时, 在当前干扰强 度不大于指定干扰强度时, CR系统能够工作,否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限, 存储到存储单元中;
用于占用受扰系统的工作频点; 检测所占用的工作频点上的干扰, 得到第一干扰样本能量平均值; 判断第一干扰样本能量平均值是否不小 于存储单元存储的第一干扰门限, 且小于存储单元存储的第二干扰门 限, 如果是,将发射参数调整为最佳发射参数, 继续占用所述工作频点; 存储单元, 用于存储第一干扰门限及第二干扰门限。
所述中央处理单元, 还用于当干扰判断单元判断第一干扰样本能量 平均值小于所设置的第一干扰门限时, 对发射参数不调整, 继续占用所 述工作频点; 当干扰判断单元判断第一干扰样本能量平均值不小于设置 的第二干扰门限时, 退出工作频点。
所述中央处理单元, 用于 CR系统的发射参数调整为最优发射参数 时, 在当前干扰强度不大于指定干扰强度时, CR系统能够工作, 否则, CR 系统无法工作, 则利用所指定的干扰强度设置第三干扰门限, 存储 在存储单元中; 在等待设置的时间后检测所占用的工作频点上的干扰, 得到第二干扰样本能量平均值; 判断第二干扰样本能量平均值是否小于 存储单元存储的第三干扰门限, 如果是, 将 CR系统的发射参数调整为 最优发射参数; 如果否, 退出工作频点;
所述存储单元, 还用于存储第三干扰门限。
与现有技术相比, 本发明实施例至少具有以下优点: 本发明实施例 中, CR系统在检测到工作频段资源上发生干扰时,通过调整本 CR系统 的发射参数,以迫使该工作频段资源上的其他 CR系统退出该工作频点, 从而在 CR系统确定所使用的空白频段资源干扰发生时, 不直接放弃空 白频段资源, 以避免干扰系统内的用户无辜的进行频谱切换, 提高干扰 系统性能。 附图简要说明
为了更清楚地说明本发明的技术方案, 下面将对实施例描述中所需 要使用的附图作筒单地介绍, 显而易见地, 下面描述中的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳 动的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种 CR系统竟争频谱资源的方法流程 图;
图 2是本发明实施例一提供的一种认知无线电系统竟争频谱资源的 方法流程示意图; 图 3是本发明实施例三提供的一种认知无线电系统竟争频谱资源的 CR系统的结构示意图。 实施本发明的方式 下面将结合本发明中的附图, 对本发明中的技术方案进行清楚、 完 整地描述, 显然, 所描述的实施例仅仅是本发明的一部分实施例, 而不 是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有 做出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
从背景技术可以看出, 在 CR系统确定所使用的空白频段资源干扰 发生时, 直接放弃空白频段资源, 使得该 CR系统内的用户无辜的进行 频谱切换, 是该 CR系统的性能不好的原因。 为了克服这个问题, 本发 明 CR系统在检测到工作频段资源上发生干扰时, 通过调整本 CR系统 的发射参数,以迫使该工作频段资源上的其他 CR系统退出该工作频点, 而本 CR系统不直接进行频段资源的切换。
图 1是本发明实施例提供的一种 CR系统竟争频谱资源的方法流程 图, 其具体步骤为:
步骤 101、 CR系统作为干扰系统, 占用受扰系统的工作频点; 在本步骤中, CR 系统在占用受扰系统的工作频点的信道时, 可以 不进行干扰检测;
步骤 102、 CR系统检测所占用的工作频点上的干扰,得到第一干扰 样本能量平均值;
步骤 103、 CR系统判断第一干扰样本能量平均值是否不小于所设置 的第一干扰门限,且小于设置的第二干扰门限,如果是,则执行步骤 104; 如果否, 则执行步骤 105; 所述第一干扰门限的设置为: CR系统的发射参数调整为检测 CR系 统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度 设置第一干扰门限;
所述第二干扰门限的设置为: CR 系统的发射参数调整为最佳发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限; 步骤 104、 CR系统将发射参数调整为最佳发射参数, 继续占用所述 工作频点;
步骤 105、 CR系统确定第一干扰样本能量平均值是否小于所设置的 第一干扰门限, 如果是, 则执行步骤 106; 如果否, 则不小于设置的第 二干扰门限, 执行步骤 107;
步骤 106、 CR系统对发射参数不调整, 继续占用所述工作频点; 步骤 107、 CR系统退出所述工作频点。
在本发明中, 当执行完步骤 104之后, 该方法还包括:
在等待设置的时间后, CR 系统检测所占用的工作频点上的干扰, 得到第二干扰样本能量平均值, 判断第二干扰样本能量平均值是否小于 所设置的第三干扰门限, 如果是, CR系统的发射参数调整为最优发射 参数; 如果否, 则 CR系统退出所述工作频点;
所述第三干扰门限的设置为: CR 系统的发射参数调整为最优发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第三干扰门限。
以下举几个实施例进行详细说明。
实施例一
本发明实施例一提供一种 CR系统竟争频谱资源的方法, 本发明实 施例中, 假设已经占用某频点的系统为受扰系统, 该频点也就是信道, 该频点为受扰系统的工作频点, 另一个接入该频点的 CR系统为干扰系 统, 也就是本发明所提出的 CR系统。 其中, 受扰系统在工作频点, 如 频点 fl上工作时,干扰系统在未对受扰系统的工作频点进行干扰检测的 情况下, 在受扰系统的工作频点上开始工作; 如图 2所示, 该方法包括 以下步骤:
步骤 201 , 干扰系统在未对工作频点进行干扰检测的情况下, 直接 占用工作频点, 并在工作频点上工作。
在本步骤中, 占用工作频点实际上就是占用该工作频点的信道; 在本步骤中, 对工作频点为受扰系统的工作频点。
步骤 202, 干扰系统检测本干扰系统在工作频点上的干扰情况, 得 到第一干扰样本能量平均值。
本发明实施例中, 在干扰检测过程中, 为了避免本干扰系统信号对 测量带来干扰, 需要设置测量时间, 也就是预设测量时间, 并在预设测 量时间内检测本干扰系统在工作频点上的干扰情况, 且在预设测量时间 内, 干扰系统需要停止在该工作频点上的所有传输, 在预设测量时间结 束之后, 干扰系统需要恢复在该工作频点上的所有传输; 基于此, 干扰 系统检测本干扰系统在工作频点上的干扰情况, 得到第一干扰样本能量 平均值包括: 干扰系统在预设测量时间内检测本干扰系统在工作频点上 的干扰情况, 得到预设测量时间内的多个采样点的信号功率, 即多个检 测样本, 并对多个采样点的信号功率进行平滑处理, 得到第一干扰样本 能量平均值。
本发明实施例中, 干扰系统对多个采样点的信号功率进行平滑处 理, 可以为对一个检测周期内得到的工作频点上的多个采样点的信号功 率进行平滑处理; 或者, 为对多个检测周期内得到的工作频点上的多个 采样点的信号功率进行平滑处理; 例如: 检测周期为 20ms, 每 20ms期 间, 利用 X ms 完成一次工作频点上的检测, 第一种方式是只对 20ms 内的检测样本进行平滑统计; 第二种方式是对多个 20ms的检测样本进 行平滑统计。
进一步的, 干扰系统对多个采样点的信号功率进行平滑处理, 具体 包括: 干扰系统通过如下公式对多个采样点的信号功率进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 在上述公式中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测周期内, 第 j个采样点的信号功率, N表示检测周期的数量, 且 N为正整数。
步骤 203 , 干扰系统判断第一干扰样本能量平均值是否小于预设第 一干扰门限; 当第一干扰样本能量平均值小于预设第一干扰门限时, 执 行步骤 204; 当第一干扰样本能量平均值不小于预设第一干扰门限时, 执行步骤 205。
本发明实施例中, 所述预设第一干扰门限的设置方式具体包括但不 限于: 当干扰系统调整本干扰系统的发射参数为检测本干扰系统的干扰 情况时所使用的发射参数时, 在当前干扰强度不大于指定干扰强度时, 干扰系统在当前干扰强度下能够工作, 且在当前干扰强度大于指定干扰 强度时, 干扰系统在当前干扰强度下不能够工作, 则可以利用指定干扰 强度设置预设第一干扰门限。
步骤 204, 干扰系统确定本干扰系统继续在工作频点上工作。
本发明实施例中, 当第一干扰样本能量平均值小于预设第一干扰门 限时, 则该干扰系统可以适度调整发射参数, 并继续在工作频点上以最 匹配的发射参数工作; 其中, 该干扰系统适度调整发射参数具体包括: 干扰系统根据干扰情况选择恰当发射参数进行工作, 此时发射功率不需 要调整到最大允许的发射功率值, 也不一定需要降低调制编码模式等级 等。
步骤 205 , 干扰系统判断第一干扰样本能量平均值是否小于预设第 二干扰门限; 当第一干扰样本能量平均值小于预设第二干扰门限时, 执 行步骤 206; 当第一干扰样本能量平均值不小于预设第二干扰门限时, 执行步骤 207。
本发明实施例中, 上述预设第二干扰门限的设置方式具体包括但不 限于: 在干扰系统调整本干扰系统的发射参数为最佳发射参数, 例如发 射功率调整到最大, 和 /或, 启动波束赋形技术, 和 /或, 降低调制编码 模式等级为最低等时, 在当前干扰强度不大于指定干扰强度时, 干扰系 统在当前干扰强度下能够工作, 且在当前干扰强度大于指定干扰强度 时, 干扰系统在当前干扰强度下不能够工作, 则可以利用指定干扰强度 设置预设第二干扰门限。
步骤 206, 干扰系统调整本干扰系统的发射参数, 并继续在工作频 点上工作。
本发明实施例中, 干扰系统调整本干扰系统的发射参数具体包括但 不限于: 干扰系统通过如下方式之一或任意组合将本干扰系统的发射参 数调整为最佳发射参数: 干扰系统提高网络侧的发射功率至最大发射功 率; 干扰系统启动波束赋形技术; 干扰系统降低调制编码模式等级为最 低等级等。
进一步地, 干扰系统在提高网络侧的发射功率至最大发射功率和 / 或启动波束赋形技术时, 该干扰系统可以通过广播信道等公共信道将相 应信息广播给用户设备; 此外, 干扰系统在降低调制编码模式等级为最 低等级时, 该干扰系统可以通过专用信令将相应信息直接通知给用户设 备。
步骤 207, 干扰系统退出工作频点, 并转移到备用频点上工作。 在步骤 206之后, 本发明实施例中, 干扰系统从调整本干扰系统的 发射参数开始, 在预设等待时间之后, 检测本干扰系统在工作频点上的 干扰情况, 得到第二干扰样本能量平均值, 并比较第二干扰样本能量平 均值与预设第三干扰门限; 当第二干扰样本能量平均值小于预设第三干 扰门限时, 该干扰系统根据当前干扰情况调整本干扰系统的发射参数, 并继续在工作频点上工作; 当第二干扰样本能量平均值不小于预设第三 干扰门限时, 此时干扰系统需要一直以最佳发射参数维持工作, 增加了 能量消耗, 因此该干扰系统需要退出工作频点, 并转移到备用频点上工 作。
本发明实施例中, 上述预设第三干扰门限的设置方式具体包括但不 限于: 在干扰系统调整本干扰系统的发射参数为使本干扰系统性能最 优, 即干扰系统继续提升发射参数进行工作时, 对干扰系统将造成较大 的损耗,损耗可以为能量损耗或设备损耗等,此时干扰系统获得的收益, 收益可以为系统容量, 系统吞吐量, 掉话率或接入用户数等, 远低于付 出的发射参数时, 在当前干扰强度不大于指定干扰强度时, 干扰系统在 当前干扰强度下能够工作, 且在当前干扰强度大于指定干扰强度时, 干 扰系统在当前干扰强度下不能够工作, 可以利用指定干扰强度设置预设 第三干扰门限。
在采用上述方式设置预设第三干扰门限之后, 通过上述步骤, 即当 第二干扰样本能量平均值小于预设第三干扰门限时, 本干扰系统继续在 工作频点上工作; 当第二干扰样本能量平均值不小于预设第三干扰门限 时,本干扰系统需要退出工作频点,从而可以保证本干扰系统性能最优。 本发明实施例中, 在干扰检测过程中, 为了避免本干扰系统信号对 测量带来干扰, 需要设置预设测量时间, 并在预设测量时间内检测本干 扰系统在工作频点上的干扰情况, 且在预设测量时间内, 干扰系统需要 停止在该工作频点上的所有传输, 在预设测量时间结束之后, 干扰系统 需要恢复在该工作频点上的所有传输; 基于此, 干扰系统检测本干扰系 统在工作频点上的干扰情况, 得到第二干扰样本能量平均值包括: 干扰 系统在预设测量时间内检测本干扰系统在工作频点上的干扰情况, 得到 预设测量时间内的多个采样点的信号功率, 即多个检测样本, 并对多个 采样点的信号功率进行平滑处理, 得到第二干扰样本能量平均值。
本发明实施例中, 干扰系统对多个采样点的信号功率进行平滑处 理, 可以为对一个检测周期内得到的工作频点上的多个采样点的信号功 率进行平滑处理; 或者, 为对多个检测周期内得到的工作频点上的多个 采样点的信号功率进行平滑处理; 例如: 检测周期为 20ms, 每 20ms期 间, 利用 X ms 完成一次工作频点上的检测, 第一种方式是只对 20ms 内的检测样本进行平滑统计; 第二种方式是对多个 20ms的检测样本进 行平滑统计。
进一步地, 干扰系统对多个采样点的信号功率进行平滑处理, 具体 包括: 干扰系统通过如下公式对多个采样点的信号功率进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 在上述公式中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测周期内, 第 j个采样点的信号功率, N表示检测周期的数量, N 为正整数。
综上所述, 本发明实施例中, 干扰系统在检测到工作频点上发生干 扰时, 通过调整本干扰系统的发射参数, 以迫使受扰系统退出该工作频 点, 从而可避免干扰系统内的用户无辜的进行频谱切换, 并可提高干扰 系统的系统性能。
实施例二
以下结合具体的应用场景对本发明实施例进行详细说明。 在本发明 实施例的应用场景中,认知无线电系统 CRS1和 CRS2公平共享频段 X, 频段 X上共有三个频点, 且三个频点分别为 fl, f2, f3。
殳当前正常工作的系统为 CRS1, 即受扰系统, 工作频点为 fl, 第一备用频点为 f2, 基站设备最大发射功率为 P_base_CRSl, 用户设备 最大允许发射功率为 P_UE_CRS1, 下行调制编码模式等级分为三种, 分别为调制编码模式 (MCS, Modulation and Coding Style, )等级 1, MCS等级 2和 MCS等级 3, MCS等级 1低于 MCS等级 2, MCS等级 2低于 MCS等级 3, 且高等级的调制编码模式, 其采用的编码率更低, 调制方式更高阶; CRS1 中工作的某 UE的下行业务的调制编码模式等 级为 MCS等级 3。
假设未经检测直接占用 CRS1的工作频点 fl的系统为 CRS2, 也就 是干扰系统, CRS2 的第一备用频点为 f2, 基站设备最大发射功率为 P_base_CRS2, 用户设备最大允许发射功率为 P_UE_CRS2, 下行调制编 码模式等级分为三种,分别为 MCS等级 1, MCS等级 2和 MCS等级 3, MCS等级 1低于 MCS等级 2, MCS等级 2低于 MCS等级 3,且高等级 的调制编码模式, 其采用的编码率更低, 调制方式更高阶; CRS2 中工 作的某用户设备的下行业务的调制编码模式等级为 MCS等级 3。
在上述应用场景下, CRS2的处理机制如下:
对应于上述步骤 201 , CRS2在未对 fl进行干扰检测的情况下, CRS2 直接占用 fl的信道, 并在 fl上进行工作。 对应于上述步骤 202, CRS2在工作过程中, 检测 fl上的干扰情况, 得到测量时间内的多个采样点的信号功率,假设一个检测周期内 fl上的 采样点为 nl 个; 通过对多个采样点的信号功率进行平滑处理, 得到第 一干扰样本能量平均值。
具体的, CRS2利用如下公式对 nl个采样点进行平滑处理, 得到 fl 上的第一干扰样本能量平均值: P— , = 其中, 当只选 取了一个检测周期内的采样点的信号功率时, 则 N=l , 且上述公式筒化 为
Figure imgf000019_0001
为每个采样点上的信号功率。
对应于上述步骤 203-步骤 207, CRS2 比较第一干扰样本能量平均 值与预设第一干扰门限; 当第一干扰样本能量平均值小于预设第一干扰 门限时, CRS2可以适度调整发射参数, 并继续在 fl上以最匹配的发射 参数工作; 且 CRS2调整发射参数具体包括: CRS2根据干扰情况选择 恰当发射参数进行工作, 此时发射功率不需要调整到最大允许的发射功 率值, 也不一定需要降低调制编码模式等级等; 例如, CRS2根据干扰 情况, UE仍可使用 MCS等级 3, 但是由于 UE向基站设备方向移动了, 降低其发射功率为 P_UE。
当第一干扰样本能量平均值不小于预设第一干扰门限时, CRS2 比 较第一干扰样本能量平均值与预设第二干扰门限; 当第一干扰样本能量 平均值不小于预设第二干扰门限时, CRS2 退出工作频点, 并转移到第 一备用频点上工作。 当第一干扰样本能量平均值小于预设第二干扰门限 时, CRS2调整 CRS2发射参数为最佳发射参数, 比如: 发射功率调整 到最大, 和 /或, 启动波束赋形技术, 和 /或, 降低调制编码模式等级为 最低等, 并继续在 fl上工作。 进一步地, CRS2从调整发射参数为最佳发射参数开始, 需要在预 设等待时间之后 CRS2检测 fl上的干扰情况,得到测量时间内的多个采 样点的信号功率, 假设一个检测周期内 fl上的采样点为 nl个; 通过对 多个采样点的信号功率进行平滑处理, 得到第二干扰样本能量平均值。 具体地说, CRS2利用如下公式进行平滑处理, 得到 fl上的第二干扰样 本能量平均值: P_ m d Pi ., 其中, 当只选取了一个检测周
期内的采样点的信号功率时, 则 Ν=1 , 且上述公式筒化为
1 nl
P— mean -― (^ ) p
nl ^ J , j为每个采样点上的信号功率。
之后, CRS2 比较第二干扰样本能量平均值与预设第三干扰门限; 当第二干扰样本能量平均值不小于预设第三干扰门限时, CRS2需要一 直以最佳发射参数维持工作,增加了能量消耗, 因此 CRS2需要退出 fl , 并转移到第一备用频点上工作; 当第二干扰样本能量平均值小于预设第 三干扰门限时, CRS2根据当前干扰情况调整发射参数, 并继续在 fl上 以最匹配的发射参数进行工作; 调整发射参数的方法与当前通用方法类 似, 如 UE与基站设备之间距离变近时, 可调小 UE的发射功率, 调高 数据业务的调制编码模式等级等。
实施例三
基于与上述方法同样的发明构思, 本发明实施例中还提供了一种认 知无线电系统中竟争频谱的干扰系统, 如图 3所示, 该系统包括:
干扰检测单元 11 , 用于占用受扰系统的工作频点; 以及检测所占用 的工作频点上的干扰, 得到第一干扰样本能量平均值;
第一干扰门限设置单元 110, 用于将 CR系统的发射参数调整为检 测 CR系统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰 强度时, CR系统能够工作, 否则, CR系统无法工作, 利用所指定的干 扰强度设置第一干扰门限;
第二干扰门限设置单元 ill , 用于 CR系统的发射参数调整为最佳 发射参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工 作, 否则, CR 系统无法工作, 则利用所指定的干扰强度设置第二干扰 门限;
干扰判断单元 12,用于判断第一干扰样本能量平均值是否不小于所 设置的第一干扰门限, 且小于设置的第二干扰门限;
发射参数调整单元 14, 用于当干扰判断单元 12判断第一干扰样本 能量平均值不小于所设置的第一干扰门限, 且小于设置的第二干扰门限 时, 将发射参数调整为最佳发射参数, 继续占用所述工作频点。
在该实施例中, 还包括干扰处理单元 13, 用于当干扰判断单元 12 判断第一干扰样本能量平均值小于所设置的第一干扰门限时, 对发射参 数不调整, 继续占用所述工作频点; 当干扰判断单元 12判断第一干扰 样本能量平均值不小于设置的第二干扰门限时, 退出工作频点。
在该实施例中, 还包括: 第三干扰门限设置单元 112, 用于 CR系 统的发射参数调整为最优发射参数时, 在当前干扰强度不大于指定干扰 强度时, CR系统能够工作, 否则, CR系统无法工作, 则利用所指定的 干扰强度设置第三干扰门限;
干扰检测单元 11 ,还用于在等待设置的时间后检测所占用的工作频 点上的干扰, 得到第二干扰样本能量平均值;
干扰判断单元 12,还用于判断第二干扰样本能量平均值是否小于所 设置的第三干扰门限;
发射参数调整单元 14, 还用于当干扰判断单元 12判断第二干扰样 本能量平均值小于所设置的第三干扰门限, 将 CR系统的发射参数调整 干扰处理单元 13, 还用于当干扰判断单元 12判断第二干扰样本能 量平均值不小于所设置的第三干扰门限, 退出工作频点。
举具体例子进行说明。
干扰检测单元 11 ,用于在未对受扰系统的工作频点进行干扰检测的 情况下, 占用所述工作频点的信道, 并在所述工作频点上工作; 以及, 检测本干扰系统在所述工作频点上的干扰情况, 得到第一干扰样本能量 平均值;
干扰判断单元 12,用于比较所述第一干扰样本能量平均值与预设第 一干扰门限; 当所述第一干扰样本能量平均值不小于所述预设第一干扰 门限时, 比较所述第一干扰样本能量平均值与预设第二干扰门限; 干扰处理单元 13,用于当所述第一干扰样本能量平均值小于所述预 设第一干扰门限时, 确定本干扰系统继续在所述工作频点上工作; 当所述第一干扰样本能量平均值小于所述预设第二干扰门限时, 确 定继续在所述工作频点上工作; 当所述第一干扰样本能量平均值不小于 所述预设第二干扰门限时, 退出所述工作频点;
发射参数调整单元 14,用于当所述第一干扰样本能量平均值小于所 述预设第二干扰门限时, 调整本干扰系统的发射参数。
所述干扰处理单元 13 对所述预设第一干扰门限的设置方式为: 当 所述干扰系统调整本干扰系统的发射参数为检测本干扰系统的干扰情 况时所使用的发射参数时, 在当前干扰强度不大于指定干扰强度时, 所 述干扰系统在当前干扰强度下能够工作, 且在当前干扰强度大于指定干 扰强度时, 所述干扰系统在当前干扰强度下不能够工作, 则利用所述指 定干扰强度设置所述预设第一干扰门限。
所述干扰处理单元 13 对所述预设第二干扰门限的设置方式为: 当 所述干扰系统调整本干扰系统的发射参数为最佳发射参数时, 在当前干 扰强度不大于指定干扰强度时, 所述干扰系统在当前干扰强度下能够工 作, 且在当前干扰强度大于指定干扰强度时, 所述干扰系统在当前干扰 强度下不能够工作, 则利用所述指定干扰强度设置所述预设第二干扰门 限。
所述发射参数调整单元 14,具体用于当所述第一干扰样本能量平均 值小于所述预设第二干扰门限时, 通过如下方式之一或任意组合将本干 扰系统的发射参数调整为最佳发射参数:
提高网络侧的发射功率至最大发射功率;
启动波束赋形技术;
降低调制编码模式等级为最低等级。
所述干扰检测单元 11 , 还用于从调整本干扰系统的发射参数开始, 在预设等待时间之后, 检测本干扰系统在所述工作频点上的干扰情况, 得到第二干扰样本能量平均值;
所述干扰判断单元 12,还用于比较所述第二干扰样本能量平均值与 预设第三干扰门限;
所述发射参数调整单元 14,还用于当所述第二干扰样本能量平均值 小于所述预设第三干扰门限时, 根据当前干扰情况调整本干扰系统的发 射参数;
所述干扰处理单元 13,还用于当所述第二干扰样本能量平均值小于 所述预设第三干扰门限时, 继续在所述工作频点上工作; 当所述第二干 扰样本能量平均值不小于所述预设第三干扰门限时, 退出所述工作频 点。
所述干扰处理单元 13 对所述预设第三干扰门限的设置方式为: 在 所述干扰系统调整本干扰系统的发射参数为使本干扰系统性能最优的 发射参数时, 在当前干扰强度不大于指定干扰强度时, 所述干扰系统在 当前干扰强度下能够工作, 且在当前干扰强度大于指定干扰强度时, 所 述干扰系统在当前干扰强度下不能够工作, 则利用所述指定干扰强度设 置所述预设第三干扰门限。
所述干扰检测单元 11 ,具体用于在预设测量时间内检测本干扰系统 在所述工作频点上的干扰情况, 得到所述预设测量时间内的多个采样点 的信号功率, 并对所述多个采样点的信号功率进行平滑处理, 得到第一 干扰样本能量平均值或者第二干扰样本能量平均值。
所述干扰检测单元 11 , 进一步用于通过如下公式进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 其中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测 周期内, 第 j个采样点的信号功率, N表示检测周期的数量。
其中, 本发明系统的各个模块可以集成于一体, 也可以分离部署。 上述模块可以合并为一个模块, 也可以进一步拆分成多个子模块。
实施例四
本发明实施例还提供一种认知无线电系统竟争频谱资源的系统, 包括: 中央处理单元及存储单元, 其中,
中央处理单元, 用于将 CR系统的发射参数调整为检测 CR系统的 干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR 系统无法工作, 利用所指定的干扰强度设置 第一干扰门限, 存储到存储单元中;
用于将 CR系统的发射参数调整为最佳发射参数时, 在当前干扰强 度不大于指定干扰强度时, CR系统能够工作,否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限, 存储到存储单元中; 用于占用受扰系统的工作频点; 检测所占用的工作频点上的干扰, 得到第一干扰样本能量平均值; 判断第一干扰样本能量平均值是否不小 于存储单元存储的第一干扰门限, 且小于存储单元存储的第二干扰门 限, 如果是,将发射参数调整为最佳发射参数, 继续占用所述工作频点; 存储单元, 用于存储第一干扰门限及第二干扰门限。
在该实施例中, 所述中央处理单元, 还用于当干扰判断单元判断第 一干扰样本能量平均值小于所设置的第一干扰门限时, 对发射参数不调 整, 继续占用所述工作频点; 当干扰判断单元判断第一干扰样本能量平 均值不小于设置的第二干扰门限时, 退出工作频点。
在该实施例中, 所述中央处理单元, 用于 CR系统的发射参数调整 为最优发射参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统 能够工作, 否则, CR 系统无法工作, 则利用所指定的干扰强度设置第 三干扰门限, 存储在存储单元中; 在等待设置的时间后检测所占用的工 作频点上的干扰, 得到第二干扰样本能量平均值; 判断第二干扰样本能 量平均值是否小于存储单元存储的第三干扰门限, 如果是, 将 CR系统 的发射参数调整为最优发射参数; 如果否, 退出工作频点;
所述存储单元, 还用于存储第三干扰门限。
上述本发明提供的方案可以对于第二类应用场景的公平式应用场 景, 当采用第二种方式接入的 CR系统, 不经过任何测量直接占用某个 频段显然会导致互干扰现象的发生时进行, 也可以对于已经占用空白频 段资源的 CR系统发生干扰时进行, 这里不再限定。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现, 当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解, 本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以 软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服 务器, 或者网络设备等)执行本发明各个实施例所述的方法。
本领域技术人员可以理解附图只是一个优选实施例的示意图,附 图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实 施例描述进行分布于实施例的装置中,也可以进行相应变化位于不同 于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个 模块, 也可以进一步拆分成多个子模块。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。 以上公开的仅为本发明的几个具体实施例, 但是, 本发明并非局 限于此,任何本领域的技术人员能思之的变化都应落入本发明的保护 范围。

Claims

权利要求书
1、 一种认知无线电系统竟争频谱资源的方法, 其特征在于, 包括: 认知无线电 CR系统作为干扰系统, 占用受扰系统的工作频点; CR 系统检测所占用的工作频点上的干扰, 得到第一干扰样本能量 平均值, 当判断第一干扰样本能量平均值不小于所设置的第一干扰门 限, 且小于设置的第二干扰门限时, 将发射参数调整为最佳发射参数, 继续占用所述工作频点;
所述第一干扰门限的设置为: CR系统的发射参数调整为检测 CR系 统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度 设置第一干扰门限;
所述第二干扰门限的设置为: CR 系统的发射参数调整为最佳发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限。
2、 如权利要求 1所述的方法, 其特征在于, 该方法还包括:
CR 系统确定第一干扰样本能量平均值小于所设置的第一干扰门限 时, 继续占用所述工作频点;
CR系统确定第一干扰样本能量平均值不小于设置的第二干扰门限, 退出所述工作频点。
3、 如权利要求 1或 2所述的方法, 其特征在于, 该方法还包括: CR 系统在等待设置的时间后, 检测所占用的工作频点上的干扰, 得到第二干扰样本能量平均值;
CR 系统判断第二干扰样本能量平均值是否小于所设置的第三干扰 门限, 如果是, CR 系统的发射参数调整为最优发射参数; 否则, CR 系统退出所述工作频点; 所述第三干扰门限的设置为: CR 系统的发射参数调整为最优发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第三干扰门限。
4、 如权利要求 3所述的方法, 其特征在于, 所述 CR系统的发射参 数调整为最佳发射参数为:
所述 CR系统提高网络侧的发射功率至最大发射功率;
或 /和所述 CR系统启动波束赋形技术;
或 /和所述 CR系统降低调制编码模式等级为最低等级。
5、 如权利要求 3 所述的方法, 其特征在于, 所述得到第一干扰样 本能量平均值或者第二干扰样本能量平均值的过程为:
所述 CR系统在预设测量时间内检测本干扰系统在所述工作频点上 的干扰情况, 得到所述预设测量时间内的多个采样点的信号功率, 并对 所述多个采样点的信号功率进行平滑处理, 得到第一干扰样本能量平均 值或者第二干扰样本能量平均值。
6、 如权利要求 5 所述的方法, 其特征在于, 所述干扰系统对所述 多个采样点的信号功率进行平滑处理, 具体包括:
所述干扰系统通过如下公式进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 其中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测 周期内, 第 j个采样点的信号功率, N表示检测周期的数量。
7、 一种认知无线电系统竟争频谱资源的系统, 其特征在于, 包括: 干扰检测单元, 用于占用受扰系统的工作频点; 以及检测所占用的 工作频点上的干扰, 得到第一干扰样本能量平均值; 第一干扰门限设置单元,用于将 CR系统的发射参数调整为检测 CR 系统的干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度 时, CR系统能够工作, 否则, CR系统无法工作, 利用所指定的干扰强 度设置第一干扰门限;
第二干扰门限设置单元, 用于 CR系统的发射参数调整为最佳发射 参数时, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限; 干扰判断单元, 用于判断第一干扰样本能量平均值是否不小于所设 置的第一干扰门限, 且小于设置的第二干扰门限;
发射参数调整单元, 用于当干扰判断单元判断第一干扰样本能量平 均值不小于所设置的第一干扰门限, 且小于设置的第二干扰门限时, 将 发射参数调整为最佳发射参数, 继续占用所述工作频点。
8、 如权利要求 7所述的系统, 其特征在于, 还包括干扰处理单元, 用于当干扰判断单元判断第一干扰样本能量平均值小于所设置的第一 干扰门限时, 对发射参数不调整, 继续占用所述工作频点; 当干扰判断 单元判断第一干扰样本能量平均值不小于设置的第二干扰门限时, 退出 工作频点。
9、 如权利要求 7或 8所述的系统, 其特征在于, 还包括: 第三干 扰门限设置单元, 用于 CR系统的发射参数调整为最优发射参数时, 在 当前干扰强度不大于指定干扰强度时, CR系统能够工作, 否则, CR系 统无法工作, 则利用所指定的干扰强度设置第三干扰门限;
干扰检测单元, 还用于在等待设置的时间后检测所占用的工作频点 上的干扰, 得到第二干扰样本能量平均值;
干扰判断单元, 还用于判断第二干扰样本能量平均值是否小于所设 置的第三干扰门限; 发射参数调整单元, 还用于当干扰判断单元判断第二干扰样本能量 平均值小于所设置的第三干扰门限, 将 CR系统的发射参数调整为最优 发射参数;
干扰处理单元, 还用于当干扰判断单元判断第二干扰样本能量平均 值不小于所设置的第三干扰门限, 退出工作频点。
10、 如权利要求 9所述的干扰系统, 其特征在于,
所述发射参数调整单元, 具体用于通过如下方式之一或任意组合将 CR系统的发射参数调整为最佳发射参数:
提高网络侧的发射功率至最大发射功率;
启动波束赋形技术;
降低调制编码模式等级为最低等级。
11、 如权利要求 9所述的干扰系统, 其特征在于,
所述干扰检测单元, 具体用于在预设测量时间内检测本干扰系统在 所述工作频点上的干扰情况, 得到所述预设测量时间内的多个采样点的 信号功率, 并对所述多个采样点的信号功率进行平滑处理, 得到第一干 扰样本能量平均值或者第二干扰样本能量平均值。
12、 如权利要求 11所述的干扰系统, 其特征在于,
所述干扰检测单元, 进一步用于通过如下公式进行平滑处理:
P— mean = 1 ~ (∑∑ ) ·
∑nt , 其中, 表示第 i个检测周期的采样点个数, 表示在第 i个检测 周期内, 第 j个采样点的信号功率, N表示检测周期的数量。
13、一种认知无线电系统竟争频谱资源的系统, 其特征在于, 包括: 中央处理单元及存储单元, 其中, 中央处理单元, 用于将 CR系统的发射参数调整为检测 CR系统的 干扰所使用的发射参数, 在当前干扰强度不大于指定干扰强度时, CR 系统能够工作, 否则, CR 系统无法工作, 利用所指定的干扰强度设置 第一干扰门限, 存储到存储单元中;
用于将 CR系统的发射参数调整为最佳发射参数时, 在当前干扰强 度不大于指定干扰强度时, CR系统能够工作,否则, CR系统无法工作, 则利用所指定的干扰强度设置第二干扰门限, 存储到存储单元中;
用于占用受扰系统的工作频点; 检测所占用的工作频点上的干扰, 得到第一干扰样本能量平均值; 判断第一干扰样本能量平均值是否不小 于存储单元存储的第一干扰门限, 且小于存储单元存储的第二干扰门 限, 如果是,将发射参数调整为最佳发射参数, 继续占用所述工作频点; 存储单元, 用于存储第一干扰门限及第二干扰门限。
14、 如权利要求 13所述的系统, 其特征在于, 所述中央处理单元, 还用于当干扰判断单元判断第一干扰样本能量平均值小于所设置的第 一干扰门限时, 对发射参数不调整, 继续占用所述工作频点; 当干扰判 断单元判断第一干扰样本能量平均值不小于设置的第二干扰门限时, 退 出工作频点。
15、 如权利要求 13所述的系统, 其特征在于, 所述中央处理单元, 用于 CR系统的发射参数调整为最优发射参数时, 在当前干扰强度不大 于指定干扰强度时, CR系统能够工作, 否则, CR系统无法工作, 则利 用所指定的干扰强度设置第三干扰门限, 存储在存储单元中; 在等待设 置的时间后检测所占用的工作频点上的干扰, 得到第二干扰样本能量平 均值; 判断第二干扰样本能量平均值是否小于存储单元存储的第三干扰 门限, 如果是, 将 CR系统的发射参数调整为最优发射参数; 如果否, 退出工作频点; 所述存储单元, 还用于存储第三干扰门限。
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