WO2011157133A2

WO2011157133A2 - Frequency spectrum sensing method and device

Info

Publication number: WO2011157133A2
Application number: PCT/CN2011/075007
Authority: WO
Inventors: 邱晶; 柳光
Original assignee: 华为技术有限公司
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2011-12-22
Also published as: CN102960013B; CN102960013A; WO2011157133A3

Abstract

A method and device for frequency spectrum sensing are disclosed by the invention, which relate to communication technology and are invented for solving the problem of the poor frequency spectrum sensing performance of a cognitive radio system in the prior art. The technical solution provided by the embodiments of the invention includes: obtaining frequency spectrum sensing performances of at least two nodes for a target frequency band (101); according to the ranking of the frequency spectrum sensing performances, obtaining a preferred node with the higher frequency spectrum sensing performance from the at least two nodes (102); transmitting a frequency spectrum sensing instruction to the preferred node, so that after receiving the frequency spectrum sensing instruction, the preferred node implements the frequency spectrum sensing for the target frequency band (103). The embodiments of the invention can be applied in the cognitive radio system.

Description

Spectrum sensing method and device

The present invention relates to communication technologies, and in particular, to a spectrum sensing method and apparatus.

Background technique

Cogn iti ve Radio (CR) is a new type of radio that senses the wireless communication environment, dynamically detects the presence of primary users, and adaptively allows secondary users to occupy available free spectrum resources while simultaneously communicating Avoid interference to the primary user during the process. Spectrum sensing is one of the key technologies of CR. The purpose of spectrum sensing is to monitor and detect the activity of the primary user signal in a specific frequency band. When detecting the presence of available free spectrum resources, the CR system can use the frequency band. In the process of the idle spectrum, if the CR system detects the presence of the primary user signal, the CR system needs to exit the frequency band at the specified time.

The method for performing spectrum sensing in the prior art includes: using nodes at different locations as sensing nodes to simultaneously perceive the target frequency band, and transmitting the sensing result to the central node; the central node weights and merges the sensing results sent by the nodes at different locations, Get the detection result of whether the target frequency band is idle.

In the process of implementing the above-mentioned spectrum sensing, the inventor has found that at least the following problems exist in the prior art: When the detection threshold of the sensing node is low, the complexity and the perceived overhead of the sensing algorithm are large, resulting in a spectrum sensing performance of the CR system. difference.

Summary of the invention

Embodiments of the present invention provide a spectrum sensing method and apparatus capable of improving spectrum sensing performance of a cognitive radio system.

On one hand, a spectrum sensing method is provided, including: acquiring spectrum sensing performance of two or more nodes to a target frequency band; and obtaining spectrum sensing performance from the two or more nodes according to the order of the spectrum sensing performance a preferred node; sending a spectrum sensing instruction to the preferred node, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

In another aspect, a spectrum sensing method is provided, including: receiving, by a receiving center node, a spectrum sensing instruction sent by a node with high spectrum sensing performance of a target frequency band to two or more nodes; after receiving the spectrum sensing instruction, Performing spectrum sensing on the target frequency band to obtain a spectrum sensing result of the target frequency band; and sending the spectrum sensing result to the associated node. In another aspect, a spectrum sensing device is provided, comprising:

a performance acquisition module, configured to acquire spectrum sensing performance of two or more nodes to a target frequency band;

a node obtaining module, configured to acquire, from the two or more nodes, a preferred node with high spectrum sensing performance according to a sequence of spectrum sensing performance acquired by the performance obtaining module; and an instruction sending module, configured to acquire the node The preferred node obtained by the module sends a spectrum sensing command, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

In a further aspect, a spectrum sensing device is provided, comprising:

An instruction receiving module, configured to receive a spectrum sensing instruction sent by a central node to a node with higher spectrum sensing performance of a target frequency band among two or more nodes;

a result obtaining module, configured to perform spectrum sensing on the target frequency band after obtaining the spectrum sensing instruction by the instruction receiving module, to obtain a spectrum sensing result of the target frequency band; and a result sending module, configured to send the As a result, the spectrum sensing result obtained by the module is obtained.

The spectrum sensing method and apparatus provided by the embodiment of the present invention, after transmitting the spectrum sensing instruction to the preferred node, enable the preferred node to perform spectrum sensing on the target frequency band after receiving the spectrum sensing instruction. Since the preferred node with higher spectrum sensing performance is selected from the two or more nodes, the complexity and the sensing overhead of the sensing algorithm can be reduced when the preferred node senses the spectrum, thereby improving the spectrum sensing performance of the cognitive radio system. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the claims Other drawings may also be obtained from these drawings without paying creative labor.

FIG. 1 is a flowchart of a spectrum sensing method according to Embodiment 1 of the present invention;

2 is a flowchart of a spectrum sensing method according to Embodiment 2 of the present invention;

3 is a flowchart of a spectrum sensing method according to Embodiment 3 of the present invention; 4 is a flowchart 1 of a spectrum sensing method according to Embodiment 4 of the present invention; FIG. 5 is a flowchart 2 of a spectrum sensing method according to Embodiment 4 of the present invention;

6 is a flowchart of a spectrum sensing method according to Embodiment 5 of the present invention;

FIG. 7 is a schematic structural diagram 1 of a spectrum sensing apparatus according to Embodiment 6 of the present invention; FIG. 8 is a schematic structural diagram 2 of a spectrum sensing apparatus according to Embodiment 6 of the present invention; FIG. 9 is a performance acquisition of the spectrum sensing apparatus shown in FIG. FIG. 10 is a schematic structural diagram 2 of a performance acquisition module in the spectrum sensing device shown in FIG. 7; FIG. 11 is a schematic structural diagram 3 of a performance acquisition module in the spectrum sensing device shown in FIG. 7; 2 is a schematic structural diagram of a spectrum sensing device according to Embodiment 7 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In order to solve the problem that the spectrum sensing performance of the prior art CR system is poor, the embodiment of the present invention provides a spectrum sensing method and apparatus.

As shown in FIG. 1, the spectrum sensing method provided by the first embodiment of the present invention includes: Step 1 01: Acquire spectrum sensing performance of two or more nodes to a target frequency band.

In this embodiment, in step 119, the frequency perception performance of the central node may be obtained by detecting thresholds of the target frequency band by two or more nodes, or by acquiring the positional relationship between the transmitters of the two or more nodes and the target frequency band. It can also be obtained in other ways.

Step 1 02: Obtain a preferred node with higher spectrum sensing performance from more than two nodes according to the order of the spectrum sensing performance.

In this embodiment, after obtaining the frequency-aware performance of the target frequency band by two or more nodes in step 101, the central node may first sort the spectrum sensing performance; and then obtain the spectrum from two or more nodes through step 102. A preferred node with higher perceived performance.

Step 1 03: Send a spectrum sensing instruction to the preferred node, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

In this embodiment, after the central node sends the spectrum sensing instruction to the preferred node in step 103, the preferred node may perform spectrum sensing on the target frequency band according to the spectrum sensing instruction. The spectrum sensing result of the target frequency band is obtained. After obtaining the spectrum sensing result, the node may send the spectrum sensing result to the associated node associated with the preferred node, so that the associated node can update the frequency used by the associated node according to the spectrum sensing result. .

In this embodiment, through the foregoing process, a plurality of preferred nodes may be selected from two or more nodes to perform spectrum sensing on one target frequency band; or from two or more nodes, corresponding preferences may be selected for different target frequency bands. The node performs spectrum sensing.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. Specifically, the process of performing spectrum sensing on the multiple target frequency bands by the central node may include: First, the central node acquires spectrum sensing performance of two or more nodes for different target frequency bands; second, the central node acquires different targets from two or more nodes. The preferred node with high spectrum sensing performance when the frequency band performs spectrum sensing; finally, the central node sends a spectrum sensing instruction to the preferred node, so that the preferred node can perform spectrum sensing on the target frequency band allocated by the central node according to the spectrum sensing instruction.

In this embodiment, in order for the preferred node to receive the spectrum sensing command sent by the central node, the preferred node may first establish an association relationship with the central node. The process of establishing the association relationship between the preferred node and the central node may include: the central node sending a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement information indicating whether the preferred node can The target frequency band performs spectrum sensing; when the acknowledgment information received by the central node is that the preferred node can perform spectrum sensing on the target frequency band, the preferred node and the central node successfully establish an association relationship; the preferred node may also establish an association relationship with the central node by other methods. Optionally, when the acknowledgment message received by the central node is that the preferred node cannot perform hopping on the target frequency band, the preferred node may be re-acquired from the two or more nodes.

In this embodiment, the node may include a sensing device such as a base station, an access point (AP), a terminal, and a sensor node.

The spectrum sensing method provided by the embodiment of the present invention sends a spectrum sensing command to a preferred node to enable the preferred node to perform spectrum sensing on the target frequency band after receiving the spectrum sensing instruction. Since the preferred node with higher spectrum sensing performance is selected from the two or more nodes, when the preferred node senses the spectrum, the complexity and the perceived overhead of the sensing algorithm can be reduced, thereby improving the spectrum sensing performance of the cognitive radio system. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art. Question.

As shown in FIG. 2, the spectrum sensing method provided in Embodiment 2 of the present invention includes: Step 201 to Step 202: Acquire spectrum sensing performance of two or more nodes to a target frequency band, and obtain a preferred node from two or more nodes. For the specific process, refer to step 101 to step 102 shown in FIG. 1.

Step 203: Send a sensing assistance request to the preferred node, so that the preferred node sends the confirmation information after receiving the sensing assistance request.

In this embodiment, the sensing assistance request sent in step 203 may include information such as a perceived target frequency band, a transmitter site, and a detection threshold. The confirmation information in step 203 may indicate whether the preferred node is capable of spectral sensing of the target frequency band.

Step 204: The received confirmation information is that when the preferred node is capable of performing spectrum sensing on the target frequency band, the spectrum sensing instruction is sent to the preferred node, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

In this embodiment, after the central node sends the spectrum sensing instruction to the preferred node in step 204, the preferred node may perform spectrum sensing on the target frequency band according to the spectrum sensing instruction, thereby obtaining a spectrum sensing result of the target frequency band; After the result is perceived, the spectrum sensing result may be sent to the associated node associated with the preferred node, so that the associated node may update the frequency used by the associated node according to the spectrum sensing result.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. Specifically, the process of performing spectrum sensing on the multiple target frequency bands by the central node may include: First, the central node acquires spectrum sensing performance of two or more nodes for different target frequency bands; second, the central node acquires different targets from two or more nodes. The preferred node having a higher frequency spectrum sensing performance when the frequency band performs spectrum sensing; again, the central node sends a sensing assistance request to the preferred node, so that the preferred node sends the confirmation information after receiving the sensing assistance request; finally, the confirmation information received by the central node When the preferred node is capable of performing spectrum sensing on the target frequency band, the spectrum sensing instruction is sent to the preferred node, so that the preferred node can perform spectrum sensing on the target frequency band allocated by the central node according to the spectrum sensing instruction.

In this embodiment, the node may include a base station, an AP, a terminal, and a sensor node. Such as sensing devices.

The spectrum sensing method provided by the embodiment of the present invention sends a spectrum sensing command to a preferred node to enable the preferred node to perform spectrum sensing on the target frequency band after receiving the spectrum sensing instruction. Since the preferred node with higher spectrum sensing performance is selected from the two or more nodes, when the spectrum is perceived by the preferred node, the complexity and the perceived overhead of the sensing algorithm can be reduced, thereby improving the spectrum sensing performance of the cognitive radio system. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art.

As shown in FIG. 3, the spectrum sensing method provided in Embodiment 3 of the present invention includes: Step 301: Acquire detection thresholds of two or more nodes to a target frequency band.

In this embodiment, the detection threshold of the target frequency band is obtained by two or more nodes in step 301, and the strength of the received signal at the node is obtained by calculating the strength of the received signal, and the strength of the received signal is the transmitted signal strength and the propagation loss. The difference can also be obtained directly from the database, and other methods can be used to obtain the detection threshold of the target frequency band by more than two nodes.

Step 302: Acquire, according to the detection threshold, a spectrum sensing performance of the target frequency band by two or more nodes.

In this embodiment, the performance of the spectrum sensing of the node with the higher detection threshold is better, and the performance of the spectrum sensing of the node with the lower detection threshold is worse. Therefore, the detection threshold of the target frequency band can be obtained according to the detection of the target frequency band by two or more nodes. Spectral perception of target frequency bands by more than two nodes

Fi.

Step 303 to step 304: Obtain a preferred node with higher spectrum sensing performance from two or more nodes, and send a spectrum sensing instruction to the preferred node. For the specific process, refer to step 1 02 to step 1 03 shown in Figure 1.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. The specific spectrum sensing process may include: First, the central node acquires a detection threshold of the target frequency band by two or more nodes, and the target frequency band may be one or more frequency bands; secondly, according to the detection threshold, acquiring two or more nodes to the target Spectral sensing performance of the frequency band; again, the central node obtains spectrum sensing performance when spectrum sensing is performed on different target frequency bands from more than two nodes. Preferably, the central node sends a spectrum sensing instruction to the preferred node, so that the preferred node can perform spectrum sensing on the target frequency band allocated by the central node according to the spectrum sensing instruction. The detecting process of the central node acquiring the target frequency band by the two or more nodes may include: the central node sending a detection threshold request to two or more nodes associated with the node; and after receiving the detection threshold request, the two or more nodes determining the target at each position Detection threshold of the frequency band; two or more nodes send the detection threshold to the central node. Other methods can also be used to obtain the detection threshold of the target frequency band by more than two nodes. For the method for determining the detection threshold of the target frequency band at each position by two or more nodes, reference may be made to step 301.

In this embodiment, the node may include a sensing device such as a base station, an AP, a terminal, and a sensor node.

As shown in FIG. 4, the spectrum sensing method provided in Embodiment 4 of the present invention includes: Step 401: Obtain spectrum sensing performance of two or more nodes to a target frequency band according to a positional relationship between two or more nodes and a transmitter of a target frequency band.

In this embodiment, since the detection threshold of two or more nodes depends on the strength of the primary user signal detected by the node, the strength of the primary user signal detected by the node is transmitted and transmitted. The distance between the machine and the node is directly related. In the cognitive radio system, the node near the transmitter can detect the strong signal strength of the primary user, and the spectrum sensing performance is better; the signal of the primary user that can be detected by the node far from the transmitter is weak, and the spectrum sensing performance is weak. Poor.

In this embodiment, the positional relationship between the two nodes and the transmitter in step 401 can be obtained from the node information and the transmitter information in the database, and can also be obtained by other means. The transmitter may be a TV tower or other equipment.

Step 402 to step 403, obtaining a preferred node with higher spectrum sensing performance from two or more nodes, and sending a spectrum sensing instruction to the preferred node. For the specific process, refer to step 102 to step 103 shown in Figure 1.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. Specifically, the process of performing spectrum sensing on the multiple target frequency bands by the central node may include: first, acquiring two or more sections according to the positional relationship of the transmitters of the two or more nodes and the target frequency band, and performing spectral sensing performance on the target frequency band; The central node obtains a preferred node with higher spectrum sensing performance when spectrum sensing is performed on different target frequency bands from more than two nodes; finally, the central node sends a spectrum sensing instruction to the preferred node, so that the preferred node can according to the spectrum sensing instruction The target frequency band allocated by the central node performs spectrum sensing.

Further, as shown in FIG. 5, the spectrum sensing method in this embodiment may further include: Step 404: Obtain transmitter information and node information from a database.

In this embodiment, the transmitter information in step 404 may include information such as a address of the transmitter, a used frequency band, a transmission power, and an antenna height; the node information may include information such as a site address of the node, and is not described herein again. .

Step 405: Acquire, according to the transmitter information and the node information, a positional relationship between two or more nodes and a transmitter.

In this embodiment, in order for the preferred node to receive the spectrum sensing instruction sent by the central node, the preferred node may first establish an association relationship with the central node. The process of establishing the association relationship between the preferred node and the central node may include: the central node sending a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement information indicating whether the preferred node can Target frequency band for spectrum sensing; central node receiving When the acknowledgment information is that the preferred node can perform spectrum sensing on the target frequency band, the preferred node and the central node successfully establish an association relationship. Optionally, when the acknowledgment information received by the central node is that the preferred node is not capable of performing frequency hopping on the target frequency band, the preferred node may be re-acquired from the two or more nodes. The preferred node may also establish an association relationship with the central node by other methods.

As shown in FIG. 6, the spectrum sensing method provided in Embodiment 5 of the present invention includes: Step 601: Receive a spectrum sensing instruction sent by a central node to a node with higher spectrum sensing performance of a target frequency band to two or more nodes.

In this embodiment, the spectrum sensing performance of the target frequency band in step 601 may be obtained by using a detection threshold or by a positional relationship between two or more nodes and a transmitter of the target frequency band.

Step 602: After receiving the spectrum sensing instruction, perform spectrum sensing on the target frequency band to obtain a spectrum sensing result of the target frequency band.

Step 603: Send a spectrum sensing result to the associated node.

In this embodiment, the associated node in step 603 is a node associated with the preferred node. The preferred node may send the spectrum sensing result to the associated node in a periodic manner; or may send the spectrum sensing result to the associated node in an event triggering manner, such as sending the spectrum sensing result to the central node when the spectrum sensing result changes; The spectrum sensing result is sent to the associated node in other ways. The spectrum sensing result is sent to the associated node in an event-triggered manner, and the specific process is not limited to the above. In this embodiment, after receiving the spectrum sensing result in step 603, the associated node may determine whether the target frequency band has an available frequency band. When the target frequency band has an available frequency band, the associated node may use the available frequency band to perform signal transmission until the The available frequency band is occupied.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. Specifically, the spectrum sensing process may include: firstly, receiving a spectrum sensing instruction sent by the central node; secondly, performing spectrum sensing on the target frequency band allocated by the central node according to the spectrum sensing instruction, and obtaining a spectrum sensing result of the corresponding target frequency band; The spectrum sensing result is sent to the associated node.

In this embodiment, in order for the preferred node to receive the spectrum sensing command sent by the central node, the preferred node may first establish an association relationship with the central node. The process of establishing the association relationship between the preferred node and the central node may include: the central node sending a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement information indicating whether the preferred node can The target frequency band performs spectrum sensing; when the acknowledgment information received by the central node is that the preferred node can perform spectrum sensing on the target frequency band, the preferred node and the central node successfully establish an association relationship. Optionally, when the acknowledgment information received by the central node is that the preferred node is not capable of frequency-aware sensing of the target frequency band, the preferred node may be re-acquired from the two or more nodes. The preferred node may also establish associations with the central node by other methods. The preferred node may also establish an association relationship with the associated node through the above process.

In this embodiment, the owner of the target frequency band is the primary user, and the owner of the non-target frequency band is the secondary user. After receiving the idle frequency band information, the associated node can use the idle frequency band for signal transmission, so that the secondary user can perform multi-dimensional spectral multiplexing with the primary user in time, frequency and space, thereby effectively utilizing the white space resource. When the associated node detects that the primary user signal appears in the process of using the idle frequency band, the associated node needs to exit the idle frequency band within a predetermined time, thereby avoiding interference of the secondary user to the primary user. The associated node may be within the geographic range or outside the geographic range, and is not described here.

In the spectrum sensing method provided by the embodiment, a node with a high detection threshold is selected as a preferred node from two or more nodes by cooperation between two or more nodes, and the preferred node performs spectrum sensing on the target frequency band, and reduces the sensing algorithm. The complexity and perceived overhead ensure spectrum sensing performance, which reduces interference to the primary user and the white space resources are effectively utilized.

The spectrum sensing method provided by the embodiment of the present invention receives the spectrum sensing command sent by the central node, and after receiving the spectrum sensing instruction, performs spectrum sensing on the target frequency band. Since the preferred node is selected from nodes with higher spectrum sensing performance among the two or more nodes, when the preferred node senses the spectrum, the complexity and the perceived overhead of the sensing algorithm can be reduced, thereby improving the cognitive radio system. Spectrum sensing performance. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art.

As shown in FIG. 7, the spectrum sensing apparatus provided in Embodiment 6 of the present invention includes: a performance obtaining module 701, configured to acquire spectrum sensing performance of two or more nodes to a target frequency band.

In this embodiment, the spectrum sensing performance of the performance obtaining module 701 can be obtained by the detection threshold of the target frequency band of two or more nodes, or by the positional relationship between the transmitters of the two or more nodes and the target frequency band. , can also be obtained by other means.

The node obtaining module 702 is configured to obtain a preferred node with high spectrum sensing performance from two or more nodes according to the order of the spectrum sensing performance acquired by the performance obtaining module.

In this embodiment, after the performance obtaining module 701 obtains the spectrum sensing performance of the target frequency band by the two or more nodes, the central node may first sort the spectrum sensing performance; and then obtain the node obtaining module 702 from the two or more nodes. A preferred node with high spectrum sensing performance.

The instruction sending module 703 is configured to send a spectrum sensing instruction to the preferred node acquired by the node acquiring module, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

In this embodiment, after the central node sends the spectrum sensing instruction to the preferred node by using the command sending module 703, the preferred node may perform spectrum sensing on the target frequency band according to the spectrum sensing instruction, thereby obtaining a spectrum sensing result of the target frequency band; After the spectrum sensing result, the spectrum sensing result may be sent to the associated node associated with the preferred node, so that the associated node may update the frequency used by the associated node according to the spectrum sensing result.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. Specifically, the process of performing spectrum sensing on the plurality of target frequency bands by the central node may include: First, the central node obtains Taking the spectrum sensing performance of two or more nodes to different target frequency bands; secondly, the central node obtains the preferred nodes with higher spectrum sensing performance when spectrum sensing is performed on different target frequency bands from more than two nodes; finally, the central node sends the preferred node to the preferred node The spectrum sensing instruction is configured to enable the preferred node to perform spectrum sensing on the target frequency band allocated by the central node according to the spectrum sensing instruction.

Further, as shown in FIG. 8, the spectrum sensing apparatus provided in this embodiment may further include:

The request sending module 704 is configured to send a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement message indicating whether the preferred node can perform spectrum sensing on the target frequency band.

In this embodiment, the sensing assistance request sent by the request sending module 704 may include information such as a perceived target frequency band, a transmitter site, and a detection threshold. The acknowledgment information in the request sending module 704 may indicate whether the preferred node is capable of spectral sensing of the target frequency band.

The command sending module 705 is configured to send the spectrum sensing command to the preferred node when the queried information is that the preferred node can perform spectrum sensing on the target frequency band.

In this embodiment, after the central node sends the spectrum sensing instruction to the preferred node by using the command sending module 705, the preferred node may perform spectrum sensing on the target frequency band according to the spectrum sensing instruction, thereby obtaining a spectrum sensing result of the target frequency band; After the spectrum sensing result, the spectrum sensing result may be sent to the associated node associated with the preferred node, so that the associated node may update the frequency used by the associated node according to the spectrum sensing result.

Further, as shown in FIG. 9, the performance obtaining module 701 in this embodiment may include: a threshold acquiring sub-module 7011, configured to acquire detection of a target frequency band by two or more nodes. Threshold.

In this embodiment, the threshold for obtaining the target frequency band by the two or more nodes is obtained by the threshold acquisition sub-module 701 1 , and the strength of the received signal at the node is obtained by calculating the strength of the received signal at the node, and the strength of the received signal is a transmit signal. The difference between the strength and the propagation loss; it can also be directly obtained from the database, and other methods can be used to obtain the detection threshold of the target frequency band by more than two nodes.

The first obtaining sub-module 701 2 is configured to acquire, according to the threshold of the threshold acquired by the threshold acquiring sub-module, the spectrum sensing performance of the target frequency band by the two or more nodes.

Fi.

In this embodiment, two or more nodes may be nodes that are randomly distributed in different locations; preferably, the two or more nodes may be nodes in a certain geographical range. The specific spectrum sensing process may include: First, the central node acquires a detection threshold of the target frequency band by two or more nodes, and the target frequency band may be one or more frequency bands; secondly, according to the detection threshold, acquiring two or more nodes to the target The spectrum sensing performance of the frequency band; again, the central node obtains the preferred nodes with higher spectrum sensing performance when spectrum sensing is performed on different target frequency bands from more than two nodes; finally, the central node sends a spectrum sensing instruction to the preferred node to make the preferred node The spectrum sensing of the target frequency band allocated by the central node may be performed according to the spectrum sensing instruction. The detecting process of the central node acquiring the target frequency band by the two or more nodes may include: the central node sending a detection threshold request to two or more nodes associated with the node; and after receiving the detection threshold request, the two or more nodes determining the target at each position Detection threshold of the frequency band; two or more nodes send the detection threshold to the central node. Other methods can also be used to obtain the detection thresholds for the target band by more than two nodes. The method for determining the detection threshold of the target frequency band at the respective positions by the two or more nodes may refer to the threshold acquisition sub-module 701 1.

Further, as shown in FIG. 10, the performance obtaining module 7 01 in this embodiment may include:

The second obtaining submodule 7 01 3 is configured to acquire spectrum sensing performance of the target frequency band by two or more nodes according to the positional relationship of the transmitters of the two or more nodes and the target frequency band.

In this embodiment, the positional relationship between the two or more nodes and the transmitter in the second acquisition submodule 701 3 can be obtained from the node information and the transmitter information in the database, and can also be obtained by other means. The transmitter may be a TV tower or other equipment.

As shown in FIG. 1 , the performance obtaining module 701 in this embodiment may further include: an information acquiring submodule 7 014, configured to obtain transmitter information and node information from a database.

In this embodiment, the information of the transmitter in the information acquisition sub-module 7014 may include information such as the address of the transmitter, the frequency band used, the transmission power, and the height of the antenna; the node information may include information such as the site address of the node, and is no longer - Narration.

The relationship acquisition sub-module 7 01 5 is configured to acquire the positional relationship between the two nodes and the transmitter according to the transmitter information and the node information acquired by the information acquisition sub-module.

In this embodiment, in order for the preferred node to receive the spectrum sensing instruction sent by the central node, the preferred node may first establish an association relationship with the central node. The process of establishing the association relationship between the preferred node and the central node may include: the central node sending a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement information indicating whether the preferred node can The target frequency band performs spectrum sensing; when the acknowledgment information received by the central node is that the preferred node can perform spectrum sensing on the target frequency band, the preferred node and the central node successfully establish an association relationship; the preferred node can also use other methods and the central node. Establish an association. Optionally, when the acknowledgment information received by the central node is that the preferred node is not capable of performing frequency hopping on the target frequency band, the preferred node may be re-acquired from the two or more nodes.

The spectrum sensing device provided by the embodiment of the present invention sends a spectrum sensing command to a preferred node to enable the preferred node to perform spectrum sensing on the target frequency band after receiving the spectrum sensing command. Since the preferred node with higher spectrum sensing performance is selected from the two or more nodes, when the spectrum is perceived by the preferred node, the complexity and the perceived overhead of the sensing algorithm can be reduced, thereby improving the spectrum sensing performance of the cognitive radio system. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art.

As shown in FIG. 12, the spectrum sensing apparatus provided in Embodiment 7 of the present invention includes: an instruction receiving module 1201, configured to receive, by a central node, a node with higher spectrum sensing performance of a target frequency band among two or more nodes. Spectrum sensing instructions.

In this embodiment, the spectrum sensing performance of the target frequency band in the command receiving module 1 2 01 may be obtained by using a detection threshold or by a positional relationship between two or more nodes and a transmitter of the target frequency band.

The result obtaining module 1202 is configured to perform spectrum sensing on the target frequency band after receiving the spectrum sensing instruction by the instruction receiving module, to obtain a spectrum sensing result of the target frequency band.

The result sending module 1 203 is configured to send the spectrum sensing result obtained by the result obtaining module to the associated node.

In this embodiment, the associated node in the result sending module 1 203 is a node associated with the preferred node. The result sending module 1 203 may include: a periodic sending submodule, configured to send the spectrum sensing result to the associated node in a periodic manner; or trigger a sending submodule, configured to send the spectrum sensing result to the associated node in an event triggering manner. The triggering sending sub-module may send the spectrum sensing result to the central node when the spectrum sensing result changes, and send the spectrum sensing result to the associated node in an event triggering manner, and the specific process is not limited to the above. In this embodiment, after receiving the spectrum sensing result by the result sending module 1 2 03, the associated node may determine whether the target frequency band has an available frequency band; when the target frequency band has an available frequency band, the associated node may use the available frequency band to perform the signal. Transfer until the available frequency band is occupied.

The spectrum sensing device provided in this embodiment reduces the complexity of the sensing algorithm and the sensing cost by using the preferred node to perform spectrum sensing on the target frequency band through cooperation between two or more nodes, thereby ensuring spectrum sensing performance, thereby reducing the performance. Interference to the primary user and white spectrum resources are effectively utilized.

The spectrum sensing device provided by the embodiment of the present invention receives the spectrum sensing command sent by the central node, and after receiving the spectrum sensing command, performs spectrum sensing on the target frequency band. Since the preferred node is selected from nodes with higher spectrum sensing performance among the two or more nodes, when the preferred node senses the spectrum, the complexity and the perceived overhead of the sensing algorithm can be reduced, thereby improving the cognitive radio system. Spectrum sensing performance. The embodiment of the invention solves the problem that the spectrum sensing performance of the CR system is poor due to the low detection threshold of the sensing node in the prior art.

The spectrum sensing method and apparatus provided by the embodiments of the present invention can be applied to a cognitive radio system.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A frequency-aware sensing method, comprising:

Obtaining spectrum sensing performance of two or more nodes to the target frequency band;

Obtaining a preferred node having higher spectrum sensing performance from the two or more nodes according to the order of the spectrum sensing performance;

Generating a spectrum sensing instruction to the preferred node, so that the preferred node performs spectrum sensing on the target frequency band after receiving the spectrum sensing instruction.

2. The spectrum sensing method according to claim 1, wherein before the sending the spectrum sensing instruction to the preferred node, the method further includes:

Sending a sensing assistance request to the preferred node, so that after receiving the sensing assistance request, the preferred node sends an acknowledgement information indicating whether the preferred node can perform spectrum sensing on the target frequency band;

The transmitting the spectrum sensing command to the preferred node is: when the received confirmation information is that the preferred node can perform spectrum sensing on the target frequency band, sending the spectrum sensing instruction to the preferred node.

The spectrum sensing method according to claim 1, wherein the acquiring spectrum sensing performance of the target frequency band by the two or more nodes includes:

Obtaining detection thresholds of the target frequency bands by the two or more nodes;

Obtaining, according to the detection threshold, spectrum sensing performance of the two or more nodes to the target frequency band.

And obtaining spectrum sensing performance of the two or more nodes for the target frequency band according to the positional relationship between the two or more nodes and the transmitter of the target frequency band.

The spectrum sensing method according to claim 4, wherein the two or more nodes are acquired for the target according to the positional relationship of the transmitters of the two or more nodes and the target frequency band Before the spectrum sensing performance of the frequency band, the method further includes:

Obtaining transmitter information and node information from a database;

And obtaining, according to the transmitter information and the node information, a positional relationship between the two or more nodes and the transmitter.

6. A frequency speech sensing method, comprising:

The receiving center node has higher spectrum sensing performance on the target frequency band to more than two nodes. a spectrum sensing instruction sent by the node;

After receiving the spectrum sensing command, performing spectrum sensing on the target frequency band to obtain a spectrum sensing result of the target frequency band;

The spectrum sensing result is sent to the associated node.

The spectrum sensing method according to claim 6, wherein the spectrum sensing performance of the target frequency band includes:

Spectrum sensing performance of the target frequency band obtained by detecting the threshold; or

Spectrum-aware performance of the target frequency band obtained by the positional relationship between the two or more nodes and the transmitter of the target frequency band.

The spectrum sensing method according to claim 6, wherein the transmitting, by the preferred node, the spectrum sensing result to the associated node includes:

Transmitting the spectrum sensing result to the associated node in a periodic manner; or

The spectrum sensing result is sent to the associated node in an event triggered manner.

9. A spectrum sensing device, comprising:

a performance obtaining module, configured to acquire spectrum sensing performance of the target frequency band by two or more nodes; and a node acquiring module, configured to acquire a spectrum from the two or more nodes according to a sequence of spectrum sensing performance acquired by the performance acquiring module a preferred node having a higher perceived performance; an instruction sending module, configured to send a spectrum sensing instruction to the preferred node acquired by the node acquiring module, so that after the receiving, by the preferred node, the spectrum sensing instruction, performing the target frequency band Spectrum sensing.

The spectrum sensing device according to claim 9, further comprising: a request sending module, configured to send a sensing assistance request to the preferred node, so that the preferred node receives the sensing assistance request And sending an acknowledgement information, where the acknowledgement information indicates whether the preferred node is capable of performing spectrum sensing on the target frequency band;

And the command sending module is configured to: when the received confirmation information is that the preferred node is capable of performing spectrum sensing on the target frequency band, send the spectrum sensing instruction to the preferred node.

The spectrum sensing device according to claim 9, wherein the performance obtaining module comprises:

a threshold acquisition submodule, configured to acquire a detection threshold of the target frequency band by the two or more nodes;

And a first acquiring submodule, configured to acquire, according to the detection threshold acquired by the threshold acquisition submodule, the spectrum sensing performance of the two or more nodes to the target frequency band.

a second obtaining submodule, configured to obtain, according to a positional relationship between the two or more nodes and the transmitter of the target frequency band, spectrum sensing of the target frequency band by the two or more nodes.

Fi.

The spectrum sensing device according to claim 12, further comprising: an information acquiring submodule, configured to acquire transmitter information and node information from a database; and a relationship obtaining submodule, configured to The transmitter information and the node information acquired by the information acquisition sub-module acquire the positional relationship between the two or more nodes and the transmitter.

A spectrum sensing device, comprising:

An instruction receiving module, configured to receive a spectrum sensing instruction sent by the central node to a node with higher spectrum sensing performance of the target frequency band among the two or more nodes;

a result obtaining module, configured to perform spectrum sensing on the target frequency band after receiving the spectrum sensing instruction by the instruction receiving module, to obtain a spectrum sensing result of the target frequency band;

And a result sending module, configured to send, to the associated node, a spectrum sensing result obtained by the result obtaining module.

The spectrum sensing device according to claim 14, wherein the result sending module comprises:

a periodic sending submodule, configured to send the spectrum sensing result to the associated node in a periodic manner; or

And triggering a sending submodule, configured to send the spectrum sensing result to the associated node in an event triggered manner.