CN113727388B - Channel using method and system based on directional monitoring - Google Patents
Channel using method and system based on directional monitoring Download PDFInfo
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- CN113727388B CN113727388B CN202111279768.3A CN202111279768A CN113727388B CN 113727388 B CN113727388 B CN 113727388B CN 202111279768 A CN202111279768 A CN 202111279768A CN 113727388 B CN113727388 B CN 113727388B
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Abstract
The invention discloses a channel using method based on directional monitoring, which comprises the following steps: acquiring a directional transmission beam radiation gain characteristic and a directional monitoring beam radiation gain characteristic; calculating a consistency parameter according to the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam; judging whether the consistency parameter is larger than a preset threshold value; and if the consistency parameter is greater than a preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam. The method and the system disclosed by the invention can effectively select the proper directional monitoring beam for the directional transmission beam, thereby avoiding the performance of channel occupation reduced by mismatching the directional transmission beam and the directional monitoring beam.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a channel using method and system based on directional monitoring.
Background
The wireless spectrum is the basis for wireless communications. Generally, the spectrum is divided into licensed spectrum and unlicensed spectrum. With increasing demand for wireless communications, global spectrum allocations are becoming more and more intense. While the traditional wireless cellular service continues to use the licensed spectrum, the usage of the unlicensed spectrum band is gradually expanded to obtain more spectrum resources. On the other hand, the demand for spectrum bandwidth is rapidly increasing, and spectrum allocation gradually expands to a high frequency band. And globally, a portion of the high-band resources have been allocated to the unlicensed spectrum. In order to maintain the continuity of the operating spectrum of a wireless cellular system, the global standards organization is actively pushing the high-band unlicensed spectrum for standardization of wireless cellular systems.
In high-frequency band wireless communication, since propagation attenuation of high-frequency signals is large, a high-gain directional antenna is generally used, or directional transmission is performed by using a multi-antenna beamforming technology, so as to improve propagation distance and signal quality. Further, since the signal energy will be concentrated in a specific spatial direction when the directional transmission is performed in the high frequency band, the interfered range will also be concentrated in the spatial range of the directional transmission. Therefore, in listening to the channel, it is only necessary to listen to a specific spatial range or whether a beam is free.
In directional monitoring, because it can only monitor the signal energy in the pointed spatial range, but the matching degree between the spatial range covered by the directional transmission beam and the range covered by the monitoring beam determines whether the channel monitoring result of the monitoring beam can be used for determining the effectiveness of whether the transmission beam can be transmitted, and in practical application, the devices (base station, user terminal, and other types of devices) working in a high frequency band usually consider the factors of processing complexity, device performance, power consumption, etc., the transmission beam and the received monitoring beam are not consistent, and the phenomenon that the directional transmission beam and the directional monitoring beam are not matched due to the inconsistency can reduce the performance of channel occupation.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for using a channel based on directional monitoring, which can effectively select a suitable directional monitoring beam for a directional transmission beam, thereby avoiding the performance of channel occupation due to mismatching between the directional transmission beam and the directional monitoring beam.
In order to solve the above technical problem, a first aspect of the present invention discloses a channel using method based on directional monitoring, where the method includes: acquiring a directional transmission beam radiation gain characteristic and a directional monitoring beam radiation gain characteristic; calculating consistency parameters according to the radiation gain characteristics of the directional transmission beams and the radiation gain characteristics of the directional monitoring beams; judging whether the consistency parameter is larger than a preset threshold value; and if the consistency parameter is greater than a preset threshold value, determining that the directional monitoring beam can be used for determining a channel state corresponding to the directional transmission beam.
In some embodiments, the directional transmission beam radiation gain characteristic comprises a directional transmission beam pattern, the directional listening beam radiation gain characteristic comprises a directional listening beam pattern, and the calculating a consistency parameter from the directional transmission beam radiation gain characteristic and the directional listening beam radiation gain characteristic comprises: acquiring a directional transmission beam direction function of the directional transmission beam pattern and a directional monitoring beam direction function of the directional monitoring beam pattern; substituting the directional transmission beam direction function and the directional monitoring beam direction function into the following formula to calculate a consistency parameter:
wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
In some embodiments, the integration range of the consistency parameter includes a main lobe range and a side lobe range, and the calculating the consistency parameter according to the directional transmission beam radiation gain characteristic and the directional listening beam radiation gain characteristic includes: substituting the directional transmission beam direction function and the directional monitoring beam direction function into the following formula, and respectively calculating a main lobe range consistency parameter of the directional monitoring beam and a main lobe range consistency parameter of the directional transmission beam:
wherein the content of the first and second substances,
a mainlobe range coherence parameter representing the directional listening beam,
a main lobe range coherence parameter representing the directional transmission beam,
representing the main lobe range angle of the directional listening beam,
representing the main lobe range angle of the directional transmission beam.
In some embodiments, determining whether the consistency parameter is greater than a preset threshold value comprises: judging whether the main lobe range consistency parameter of the directional monitoring wave beam and the main lobe range consistency parameter of the directional transmission wave beam are both higher than a preset threshold value; and if the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
In some embodiments, the determining whether the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value includes: if one of the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam is higher than a preset threshold value, and the other one is lower than the preset threshold value, it is determined that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
In some embodiments, if one of the mainlobe range consistency parameter of the directional listening beam and the mainlobe range consistency parameter of the directional transmitting beam is higher than a preset threshold and the other is lower than a preset threshold, determining that the directional listening beam can be used to determine the channel status corresponding to the directional transmitting beam includes: if the mainlobe range consistency parameter of the directional monitoring beam is higher than a preset threshold value and the mainlobe range consistency parameter of the directional transmission beam is lower than the preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam; and the channel state is that the radiation range of the directional transmission beam is larger than the monitoring range of the directional monitoring beam.
In some embodiments, if one of the mainlobe range consistency parameter of the directional listening beam and the mainlobe range consistency parameter of the directional transmitting beam is higher than a preset threshold and the other is lower than a preset threshold, determining that the directional listening beam can be used to determine the channel status corresponding to the directional transmitting beam includes: if the consistency parameter of the main lobe range of the directional monitoring beam is lower than a preset threshold value and the consistency parameter of the main lobe range of the directional transmission beam is higher than the preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam; and the channel state is that the radiation range of the directional transmission beam is smaller than the monitoring range of the directional monitoring beam.
In some embodiments, the method further comprises: acquiring at least two gain differences in the same direction of a directional monitoring beam and a directional transmission beam; calculating a consistency parameter according to the gain difference; and determining, by the consistency parameter, that the directional listening beam can be used to determine a channel state corresponding to the directional transmission beam.
According to a second aspect of the present invention, there is provided a channel using system based on directional listening, the system comprising: the radiation gain characteristic determination module is used for acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam; the calculation module is used for calculating a consistency parameter according to the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam; the judging module is used for judging whether the consistency parameter is larger than a preset threshold value; a channel state module, configured to determine that the directional monitoring beam can be used to determine a channel state corresponding to the directional transmission beam if the consistency parameter is greater than a preset threshold.
In some embodiments, the directional transmission beam radiation gain characteristic comprises a directional transmission beam pattern, the directional listening beam radiation gain characteristic comprises a directional listening beam pattern, the calculation module comprises: a function unit, configured to obtain a directional transmission beam direction function of the directional transmission beam pattern and a directional monitoring beam direction function of the directional monitoring beam pattern; a formula unit, configured to substitute the directional transmission beam direction function and the directional listening beam direction function into the following formula to calculate a consistency parameter:
wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
Compared with the prior art, the invention has the beneficial effects that:
by judging the matching degree between the directional transmission beam and the directional monitoring beam, the invention can determine whether the channel monitoring result of the directional monitoring beam can be used for judging the channel state corresponding to the directional transmission beam. When the channel monitoring result of the directional monitoring beam is effective for judging the channel corresponding to the directional transmission beam, the directional monitoring beam and the directional transmission beam are consistent, and a proper directional monitoring beam can be effectively selected for the directional transmission beam, so that the situation that the directional transmission beam is not matched with the directional monitoring beam to reduce the channel occupation performance is avoided.
Drawings
Fig. 1 is a schematic diagram illustrating a relationship between a directional monitoring beam and a directional transmission beam according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a channel using method based on directional monitoring according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another method for channel usage based on directional monitoring according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of channel usage based on directional listening according to another embodiment of the present invention;
fig. 5 is a schematic flow chart of another channel usage based on directional listening according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a gain relationship between a directional listening beam and a directional transmitting beam according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a channel utilization system based on directional monitoring according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a channel utilization apparatus based on directional listening according to an embodiment of the present invention.
Detailed Description
For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a channel using method and a system based on directional monitoring, which can determine whether a channel monitoring result of a directional monitoring beam can be used for judging a channel state corresponding to the directional transmission beam by judging the matching degree between the directional transmission beam and the directional monitoring beam. When the channel monitoring result of the directional monitoring beam is effective for judging the channel corresponding to the directional transmission beam, the directional monitoring beam and the directional transmission beam are consistent, and a proper directional monitoring beam can be effectively selected for the directional transmission beam, so that the situation that the directional transmission beam is not matched with the directional monitoring beam to reduce the channel occupation performance is avoided.
Example one
Referring to fig. 2, fig. 2 is a flowchart illustrating a channel using method based on directional monitoring according to an embodiment of the present invention. The channel usage based on directional monitoring can be applied to a wireless communication system, and the application of the channel usage method based on directional monitoring is not limited in the embodiment of the present invention. As shown in fig. 2, the channel using method based on directional listening may include the following operations:
101. and acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam.
In wireless communication, generally, for the radiation gain characteristic, the radiation gain characteristic of the directional transmitting beam and the radiation gain characteristic of the directional listening beam, i.e. the relationship between the directional listening beam and the directional transmitting beam is schematically shown in fig. 1, the relatively dark line represents the directional listening beam, and the number of the directional listening beams is often less than or equal to the number of the directional transmitting beams.
102. And calculating a consistency parameter according to the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam.
The inventor uses the beam pattern corresponding to the radiation gain characteristic as a calculation medium, namely, the radiation gain characteristic of the directional transmission beam comprises a directional transmission beam pattern, the radiation gain characteristic of the directional listening beam comprises a directional listening beam pattern, and a final consistency parameter calculation formula is derived through the correlation between the directional listening beam and the directional transmission beam. The following explains the concept of the inventor:
because Energy Detection (ED) is usually used for channel monitoring as a physical quantity for determining the channel state, when the monitored and received Energy exceeds a specific threshold value, it is determined that the channel is occupied, otherwise, the channel is considered to be idle for transmission.
When directional monitoring is used, the spatial distribution of the received power is determined by the spatial power spectrum of the received signal and the monitoring beam, as shown in the following formula (1).
.
.(1)
Wherein，
In order to receive the spatial distribution of the power,
for the directional listening beam direction function to which the directional listening beam pattern corresponds,
is the spatial distribution of the received signal. The total received power is therefore:
.
. (2)
when in use
It is assumed that the channel in the direction of the listening beam is currently occupied,
the energy detection threshold value.
Similarly, when directional transmission is used, the spatial distribution of transmit power is determined by the transmit power in conjunction with the transmission beam, as shown in equation (3).
Wherein the content of the first and second substances,
in order to transmit the spatial distribution of power,
for a directional transmit beam function corresponding to the directional transmit beam pattern,
is a transmit power signal.
To simplify the derivation steps, the following analysis may assume that the above physical quantities are all normalized. If the above-mentioned physical quantity is an absolute value, it is only necessary to multiply by the corresponding amplitude value. Further, the following analysis also assumes an angular distribution based on a two-dimensional plane, which can be calculated in a manner that extends directly to the angular distribution in three-dimensional space.
When the directional monitoring beam is consistent with the directional transmission beam, and the power of the signal received by the directional monitoring beam exceeds a preset threshold value, it indicates that the channel in the spatial range corresponding to the directional transmission beam is unavailable, that is, if the signal is transmitted by the directional transmission beam at this time, significant interference is caused to the corresponding neighbor node. That is, the listening beam and the transmission beam are considered to be identical only when equations (4) and (5) below are satisfied at the same time.
Wherein, satisfying both formula (4) and formula (5) can be specifically expressed as: when a neighbor node with a radiation power distribution is detected to exist, signals are still transmitted by directional transmission beam transmission power, and the interference caused to the neighbor node is proportional to
. Considering equations (1) - (5) together, it can be considered that the correlation between the directional listening beam pattern and the directional transmitting beam pattern can be expressed as
And
and thus, derives a main conclusive formula of the present invention, as shown in the following formula (6).
Wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
The consistency parameter calculated according to equation (6) may indicate the degree of similarity between the directional listening beam and the directional transmitting beam.
It should be noted that the above-mentioned derivation concepts of the present invention are not used as the basis for limiting the scope of the present invention, but the intermediate steps or the whole derivation processes of the derivation concepts similar or equivalent to the derivation concepts of the present invention also belong to the protection scope of the present invention.
103. And judging whether the consistency parameter is larger than a preset threshold value.
And then, determining whether the obtained consistency parameter is larger than a preset threshold value according to the obtained consistency parameter, wherein the threshold value can be set according to manual experience about high-frequency communication or according to communication requirements of a channel, and a specific numerical value of the threshold value is not set in the invention.
104. And if the consistency parameter is greater than a preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
If the obtained value of the consistency parameter is larger than the preset threshold value, the higher the similarity degree of the directional monitoring beam and the directional transmission beam is, so that the state of the spatial channel corresponding to the directional transmission beam can be effectively represented by the monitoring result of the directional monitoring beam at the moment, and the channel occupation condition can be conveniently and timely judged.
Example two
Referring to fig. 3, fig. 3 is a flowchart illustrating another channel using method based on directional listening according to an embodiment of the present invention. The channel usage based on directional monitoring can be applied to a wireless communication system, and the application of the channel usage method based on directional monitoring is not limited in the embodiment of the present invention. As shown in fig. 3, the channel using method based on directional listening may include the following operations:
201. and acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam.
202. And calculating a consistency parameter according to the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam, wherein the integral range of the consistency parameter comprises a main lobe range and a side lobe range.
The implementation manners of step 201 and step 202 are substantially the same as those of step 101 and step 102, and are not described herein again. The difference with respect to step 202 is that the typical radiation gain is concentrated in the main lobe, since most of the beams have a main lobe and side lobes structure. Illustratively, this may be embodied as a beam main lobe, or an angular range with a gain above a certain threshold. In general, the beam main lobe may be defined as the angular range within the first null before and after the maximum radiation direction where the gain is above a certain threshold, e.g., a-3 dB threshold (relative to the maximum gain direction).
The beam pattern is represented as corresponding to different angle ranges, that is, in this embodiment, a main lobe range consistency parameter of the directional listening beam and a main lobe range consistency parameter of the directional transmitting beam need to be calculated respectively, and the directional transmitting beam direction function and the directional listening beam direction function are substituted into the following equations (7) and (8), respectively:
wherein the content of the first and second substances,
a mainlobe range coherence parameter representing the directional listening beam,
a main lobe range coherence parameter representing the directional transmission beam,
representing the main lobe range angle of the directional listening beam,
representing the main lobe range angle of the directional transmission beam.
203. And judging whether the main lobe range consistency parameter of the directional monitoring beam and the main lobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value.
Whether the main lobe range consistency parameter of the directional monitoring beam and the main lobe range consistency parameter of the directional transmission beam are calculated or compared with a preset threshold value is needed to judge the correlation degree of the main lobe range consistency parameter of the directional monitoring beam and the main lobe range consistency parameter of the directional transmission beam.
204. And if the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
Therefore, the two-way beam selection based on local consistency can be realized, and the state of the spatial channel corresponding to the directional transmission beam under the main lobe structure can be effectively shown according to the monitoring result of the directional monitoring beam at the moment, so that the channel occupation condition can be judged in time.
EXAMPLE III
Referring to fig. 4, fig. 4 is a schematic flowchart illustrating another channel using method based on directional listening according to an embodiment of the present invention. The channel usage based on directional monitoring can be applied to a wireless communication system, and the application of the channel usage method based on directional monitoring is not limited in the embodiment of the present invention.
301. And acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam.
302. And calculating a consistency parameter according to the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam, wherein the integral range of the consistency parameter comprises a main lobe range and a side lobe range.
303. And judging whether the main lobe range consistency parameter of the directional monitoring beam and the main lobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value.
The implementation manners of steps 301 to 303 are substantially the same as those of steps 201 to 203, and are not described herein again.
304. If one of the main lobe range consistency parameter of the directional monitoring beam and the main lobe range consistency parameter of the directional transmission beam is higher than a preset threshold value, and the other one is lower than the preset threshold value, it is determined that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
The specific implementation of the step includes two cases, and in the first case, it is determined that the directional monitoring beam can be used to determine the channel state corresponding to the directional transmission beam if the main lobe range consistency parameter of the directional monitoring beam is higher than a preset threshold value and the main lobe range consistency parameter of the directional transmission beam is lower than the preset threshold value; and the channel state is that the radiation range of the directional transmission beam is larger than the monitoring range of the directional monitoring beam. Specifically, the radiation range of the directional transmission beam may be or must be larger than the monitoring range of the directional monitoring beam, and then it is determined whether the directional through beam transmission is possible based on the monitoring result, so that the false-alarm probability of the monitoring beam can be improved.
In the second case, it is shown that if the main lobe range consistency parameter of the directional monitoring beam is lower than the preset threshold value and the main lobe range consistency parameter of the directional transmission beam is higher than the preset threshold value, it is determined that the directional monitoring beam can be used to determine the channel state corresponding to the directional transmission beam; and the channel state is that the radiation range of the directional transmission beam is smaller than the monitoring range of the directional monitoring beam. Specifically, the monitoring range of the directional monitoring beam may be or must be larger than the radiation range of the directional transmitting beam, and at this time, it is determined whether the directional transmitting beam can be transmitted based on the monitoring result, so that the false alarm probability of monitoring can be improved.
Therefore, single beam selection based on local consistency can be realized, the state of the spatial channel corresponding to the directional transmission beam under the main lobe structure can be effectively shown according to the monitoring result of the directional monitoring beam at the moment, and the channel occupation condition can be conveniently and timely judged.
Example four
Referring to fig. 5, fig. 5 is a flowchart illustrating another channel using method based on directional listening according to an embodiment of the present invention. The channel usage based on directional monitoring can be applied to a wireless communication system, and the application of the channel usage method based on directional monitoring is not limited in the embodiment of the present invention.
401. And acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam. The implementation manner of step 401 is substantially the same as that of step 201, and is not described herein again.
402. And acquiring at least two gain differences in the same direction of the directional monitoring beam and the directional transmission beam, and calculating a consistency parameter according to the gain differences.
Since the relationship between the directional listening beam and the directional transmission beam determined by the above equations (7) and (8) requires a relatively complicated process, it is necessary to accurately measure the radiation patterns of both beams and calculate the correlation therebetween. In this embodiment, a method for simply representing the relationship between two beams under the concept is provided, that is, based on measuring the maximum value of the gain difference between two beams in the same direction, the difference between two beams in the listening/radiating direction is represented, specifically, as shown in fig. 6, the schematic diagram of the relationship between two beams represented by the maximum value of the gain difference between two beams in the same direction is provided, so that the beam pattern is not needed as a main calculation method.
The same-direction gain difference of the two beams can be divided into two types:
1) the directional listening beam is larger than the directional transmission beam by the gain difference,
2) the directional transmission beam is larger than the directional listening beam by the gain difference.
403. The determination of the directional listening beam through the consistency parameter can be used to determine a channel state corresponding to the directional transmission beam.
By measuring the gain difference of the two beams in all directions, the maximum of the two gain differences can be determined, as shown by Ymax and Xmax in fig. 6. It can be seen that the smaller the two maximum gain differences, the higher the similarity between the two beams, and the higher the corresponding beam correlation value.
Specifically, with the scenario where the directional listening beam and the directional transmitting beam are completely the same as the reference scenario, when the directions/shapes of the two beams are different, and the transmitter power back-off (Ymax + Xmax) dB, it can be ensured that the generated interference is not greater than the interference strength generated in the reference scenario.
Therefore, the state of the spatial channel corresponding to the directional transmission beam under the main lobe structure can be effectively shown according to the beam selection of the difference between the gain of the monitoring beam and the gain of the sending beam, and the channel occupation state can be conveniently and timely judged.
EXAMPLE five
Referring to fig. 7, fig. 7 is a schematic structural diagram of a channel utilization system based on directional monitoring according to an embodiment of the present invention. As shown in fig. 7, the channel using system based on directional listening may include:
a beam pattern determining module 1, configured to obtain a directional transmission beam pattern and a directional listening beam pattern. In wireless communication, generally, the relationship between the directional monitoring beams and the directional transmission beams is schematically shown in fig. 1, and the relatively dark lines represent the directional monitoring beams, and the number of the directional monitoring beams is often less than or equal to the number of the directional transmission beams.
And the calculating module 2 is used for calculating the consistency parameter according to the directional transmission beam pattern and the directional monitoring beam pattern.
And the judging module 3 is used for judging whether the consistency parameter is greater than a preset threshold value. And determining whether the obtained consistency parameter is larger than a preset threshold value according to the obtained consistency parameter, wherein the threshold value can be set according to manual experience about high-frequency communication or according to the communication requirement of a channel, and a specific numerical value of the threshold value is not set in the invention.
And a channel state module 4, configured to determine that the directional monitoring beam can be used to determine a channel state corresponding to the directional transmission beam if the consistency parameter is greater than a preset threshold. If the obtained value of the consistency parameter is larger than the preset threshold value, the higher the similarity degree of the directional monitoring beam and the directional transmission beam is, so that the state of the spatial channel corresponding to the directional transmission beam can be effectively represented by the monitoring result of the directional monitoring beam at the moment, and the channel occupation condition can be conveniently and timely judged.
Wherein, the calculation module 2 comprises: a function unit 21, configured to obtain a directional transmit beam direction function of the directional transmit beam pattern and a directional listening beam direction function of the directional listening beam pattern.
A formula unit 22, configured to substitute the directional transmission beam direction function and the directional listening beam direction function into the following formula to calculate a consistency parameter:
wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
For the origin of the above formula: because Energy Detection (ED) is usually used for channel monitoring as a physical quantity for determining the channel state, when the monitored and received Energy exceeds a specific threshold value, it is determined that the channel is occupied, otherwise, the channel is considered to be idle for transmission.
When directional monitoring is used, the spatial distribution of the received power is determined by the spatial power spectrum of the received signal and the monitoring beam, as shown in the following formula (1).
.
.(1)
Wherein the content of the first and second substances,
in order to receive the spatial distribution of the power,
for the directional listening beam direction function to which the directional listening beam pattern corresponds,
is the spatial distribution of the received signal. The total received power is therefore:
.
. (2)
when in use
It is assumed that the channel in the direction of the listening beam is currently occupied,
the energy detection threshold value.
Similarly, when directional transmission is used, the spatial distribution of transmit power is determined by the transmit power in conjunction with the transmission beam, as shown in equation (3).
Wherein the content of the first and second substances,
in order to transmit the spatial distribution of power,
for a directional transmit beam function corresponding to the directional transmit beam pattern,
is a transmit power signal.
To simplify the derivation steps, the following analysis may assume that the above physical quantities are all normalized. If the above-mentioned physical quantity is an absolute value, it is only necessary to multiply by the corresponding amplitude value. Further, the following analysis also assumes an angular distribution based on a two-dimensional plane, which can be calculated in a manner that extends directly to the angular distribution in three-dimensional space.
When the directional monitoring beam is consistent with the directional transmission beam, and the power of the signal received by the directional monitoring beam exceeds a preset threshold value, it indicates that the channel in the spatial range corresponding to the directional transmission beam is unavailable, that is, if the signal is transmitted by the directional transmission beam at this time, significant interference is caused to the corresponding neighbor node. That is, the listening beam and the transmission beam are considered to be identical only when equations (4) and (5) below are satisfied at the same time.
Wherein, satisfying both formula (4) and formula (5) can be specifically expressed as: when a neighbor node with a radiation power distribution is detected to exist, signals are still transmitted by directional transmission beam transmission power, and the interference caused to the neighbor node is proportional to
. Considering equations (1) - (5) together, it can be considered that the correlation between the directional listening beam pattern and the directional transmitting beam pattern can be expressed as
And
and thus, derives a main conclusive formula of the present invention, as shown in the following formula (6).
Wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
The consistency parameter calculated according to equation (6) may indicate the degree of similarity between the directional listening beam and the directional transmitting beam.
EXAMPLE six
Referring to fig. 8, fig. 8 is a schematic structural diagram of a channel utilization apparatus based on directional monitoring according to an embodiment of the present invention. The directional listening based channel utilization apparatus described in fig. 8 may be applied to a wireless communication system, and the application system of the directional listening based channel utilization apparatus is not limited in the embodiments of the present invention. As shown in fig. 8, the apparatus may include:
a memory 601 in which executable program code is stored;
a processor 602 coupled to a memory 601;
the processor 602 calls the executable program code stored in the memory 601 for executing the directional snoop-based channel using method described in the first to fourth embodiments.
EXAMPLE seven
The embodiment of the invention discloses a computer-readable storage medium which stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute the directional interception based channel using method described in the first embodiment to the fourth embodiment.
Example eight
The embodiment of the invention discloses a computer program product, which comprises a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to make a computer execute the directional interception based channel using methods described in the first embodiment to the fourth embodiment.
The above-described embodiments are only illustrative, and the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, where the storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc-Read-Only Memory (CD-ROM), or other disk memories, CD-ROMs, or other magnetic disks, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
Finally, it should be noted that: the channel using method and system based on directional monitoring disclosed in the embodiments of the present invention are only disclosed as preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for using a channel based on directional listening, the method comprising:
acquiring a directional transmission beam radiation gain characteristic and a directional monitoring beam radiation gain characteristic;
calculating a consistency parameter for representing the similarity degree of the directional transmission beam and the directional monitoring beam according to the directional transmission beam radiation gain characteristic and the directional monitoring beam radiation gain characteristic;
judging whether the consistency parameter is larger than a preset threshold value;
and if the consistency parameter is greater than a preset threshold value, determining that the directional monitoring beam can be used for determining a channel state corresponding to the directional transmission beam.
2. The directional-listening-based channel usage method according to claim 1, wherein the directional transmission beam radiation gain characteristic comprises a directional transmission beam pattern, the directional listening beam radiation gain characteristic comprises a directional listening beam pattern, and the calculating the consistency parameter according to the directional transmission beam radiation gain characteristic and the directional listening beam radiation gain characteristic comprises:
acquiring a directional transmission beam direction function of the directional transmission beam pattern and a directional monitoring beam direction function of the directional monitoring beam pattern;
substituting the directional transmission beam direction function and the directional listening beam direction function into the following formula to calculate a consistency parameter:
wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
as the parameters of the angle, the angle is,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
3. The method for using the channel based on directional listening of claim 2, wherein the integration range of the consistency parameter comprises a main lobe range and a side lobe range, and the calculating the consistency parameter according to the directional transmission beam radiation gain characteristic and the directional listening beam radiation gain characteristic comprises:
substituting the directional transmission beam direction function and the directional monitoring beam direction function into the following formula, and respectively calculating a main lobe range consistency parameter of the directional monitoring beam and a main lobe range consistency parameter of the directional transmission beam:
wherein the content of the first and second substances,
a mainlobe range coherence parameter representing the directional listening beam,
representing directional transmission beamsA main-lobe range consistency parameter that is,
representing the main lobe range angle of the directional listening beam,
representing the main lobe range angle of the directional transmission beam.
4. The method of claim 3, wherein determining whether the consistency parameter is greater than a preset threshold comprises:
judging whether the main lobe range consistency parameter of the directional monitoring wave beam and the main lobe range consistency parameter of the directional transmission wave beam are both higher than a preset threshold value;
and if the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
5. The method for using the channel based on directional listening of claim 4, wherein the determining whether the mainlobe range consistency parameter of the directional listening beam and the mainlobe range consistency parameter of the directional transmission beam are both higher than a preset threshold value comprises:
if one of the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam is higher than a preset threshold value, and the other one is lower than the preset threshold value, it is determined that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam.
6. The method as claimed in claim 5, wherein if one of the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam is higher than a preset threshold value and the other one is lower than the preset threshold value, determining that the directional monitoring beam can be used to determine the channel status corresponding to the directional transmission beam comprises:
if the mainlobe range consistency parameter of the directional monitoring beam is higher than a preset threshold value and the mainlobe range consistency parameter of the directional transmission beam is lower than the preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam;
and the channel state is that the radiation range of the directional transmission beam is larger than the monitoring range of the directional monitoring beam.
7. The method as claimed in claim 5, wherein if one of the mainlobe range consistency parameter of the directional monitoring beam and the mainlobe range consistency parameter of the directional transmission beam is higher than a preset threshold value and the other one is lower than the preset threshold value, determining that the directional monitoring beam can be used to determine the channel status corresponding to the directional transmission beam comprises:
if the consistency parameter of the main lobe range of the directional monitoring beam is lower than a preset threshold value and the consistency parameter of the main lobe range of the directional transmission beam is higher than the preset threshold value, determining that the directional monitoring beam can be used for determining the channel state corresponding to the directional transmission beam;
and the channel state is that the radiation range of the directional transmission beam is smaller than the monitoring range of the directional monitoring beam.
8. A system for channel utilization based on directional listening, the system comprising:
the radiation gain characteristic determination module is used for acquiring the radiation gain characteristic of the directional transmission beam and the radiation gain characteristic of the directional monitoring beam;
the calculation module is used for calculating a consistency parameter for representing the similarity degree of the directional transmission beam and the directional monitoring beam according to the directional transmission beam radiation gain characteristic and the directional monitoring beam radiation gain characteristic;
the judging module is used for judging whether the consistency parameter is larger than a preset threshold value;
a channel state module, configured to determine that the directional monitoring beam can be used to determine a channel state corresponding to the directional transmission beam if the consistency parameter is greater than a preset threshold.
9. The system of claim 8, wherein the directional listening based channel using characteristic comprises a directional transmitting beam pattern, the directional listening beam radiation gain characteristic comprises a directional listening beam pattern, and the calculating module comprises:
a function unit, configured to obtain a directional transmission beam direction function of the directional transmission beam pattern and a directional monitoring beam direction function of the directional monitoring beam pattern;
a formula unit, configured to substitute the directional transmission beam direction function and the directional listening beam direction function into the following formula to calculate a consistency parameter:
wherein Coh is a consistency parameter for indicating the degree of similarity of the directional transmission beam and the directional listening beam,
as the parameters of the angle, the angle is,
for directional listening beam direction function
Is composed of
The conjugate of (a) to (b),
as a function of the directional transmission beam direction.
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