CN100558003C - A Dynamic Spectrum Management Method Based on Spectrum Multiple Usage - Google Patents

Abstract

The invention discloses a dynamic spectrum management method based on multiple use of spectrum. A dynamic spectrum management system is newly added under the radio management organization to realize the reuse of allocated spectrum by unlicensed users; the dynamic spectrum management system includes dynamic spectrum management center, frequency usage status database, spectrum monitoring unit, and the monitored actual spectrum usage environment; under the guidance of management rules, the dynamic spectrum management center directly receives spectrum applications and assigned spectrum from unlicensed users; the spectrum monitoring module periodically monitors changes in the wireless environment And report the results to the frequency usage status database, the database dynamically records and provides frequency usage status data to the dynamic spectrum management center; the management rules include application frames, allocation frame formats, database query methods, and spectrum allocation methods; Dynamic spectrum management systems use frame format to transmit spectrum application and allocation information to realize automatic and rapid frequency application and allocation.

Description

A Dynamic Spectrum Management Method Based on Spectrum Multiple Usage

technical field

The invention belongs to the technical field of wireless communication. Specifically, it is a dynamic spectrum management method based on spectrum multiple use, which is used to improve spectrum utilization.

Background technique

The existing wireless spectrum management rules adopt a single-purpose spectrum allocation method, that is, the radio spectrum management department allocates a certain frequency band to a certain business, and it can only be used by the business; further, a certain frequency band is allocated to a certain If there is a wireless service operator (or group, department, etc.), the frequency band can only be used by users belonging to the operator, and other users cannot use the frequency band. Even if the former does not use this frequency band, the latter has no right to use this frequency band. In fact, after monitoring spectrum resources for a long time, it will be found that some frequency bands allocated to radio service operators have not been used for a long time, and some frequency bands are only used part of the time, and only some frequency bands are frequently used. Foreign research literature "Cognitive Radio", John Welko, IEEReview, May 2005 and our real-time monitoring of certain frequency bands (see Figure 1) have all confirmed this conclusion. At present, all kinds of radio users are increasing rapidly, making wireless spectrum resources very scarce. However, as mentioned above, the current use of spectrum resources is: on the one hand, many valuable spectrum resources are often idle, and on the other hand, because these spectrums have been allocated, many other users who are eager to use the radio spectrum cannot use them legally these spectrums. This insufficient use of scarce wireless spectrum resources is caused by the single-purpose spectrum allocation method used in current radio spectrum management. It is the management method that limits the ability of potential spectrum users to obtain spectrum access, that is, limits the full use of spectrum resources. . Today, when radio spectrum resources are very precious, partly modifying radio spectrum management methods to improve spectrum utilization should be put on the agenda. The proposed concept of spectrum multi-purpose refers to mining and utilizing the "grey frequency band" of the spectrum or the unused frequency band of the dedicated spectrum, which provides an idea for modifying the spectrum management method. The existing radio spectrum management method is that the radio spectrum management agency formulates frequency use rules, radio frequency users apply for frequencies to the radio spectrum management agency in written form, and the management agency then assigns frequencies to radio users in the form of written documents. For the management method, see figure 2.

The existing radio spectrum management is divided into three levels: frequency band division, frequency band allocation, and channel assignment. The three levels of objects and their implementations are shown in Table 1.

name level object implementer Frequency band division high business   Senior Management frequency band allocation Depend on department Frequency Management Department channel assignment Low radio station Wireless network operator

Table 1

Frequency band allocation: A specific frequency band is included in the frequency allocation table, which stipulates that the frequency band can be used by one or more terrestrial or space radio communication services or radio astronomy services under specified conditions.

Frequency band allocation: The radio frequency band is stipulated by one or more departments to be used by terrestrial or space radio communication services under specified conditions in a designated area.

Channel Assignment: The assignment of a channel to a radio station for use under specified conditions.

To sum up, the existing radio spectrum management methods are suitable for fixed spectrum allocation and assignment to licensed users. However, the existing wireless spectrum management methods alone cannot complete the re-use of the allocated spectrum by unlicensed users and the real-time backoff of unlicensed users when authorized users arrive. This requires designing a dynamic spectrum management method and setting up a special department to assign frequencies to unlicensed users. Therefore, it is necessary to design a dynamic spectrum management method for unlicensed users based on cognitive radio technology as a supplement and modification to the existing radio spectrum management methods. The improved spectrum management system can provide spectrum management for authorized users according to the existing method, and provide spectrum management for unlicensed users according to the dynamic spectrum management method.

Contents of the invention

Aiming at the deficiencies of existing radio spectrum management methods, in order to satisfy unlicensed users to re-use the allocated spectrum without using it, the present invention proposes a dynamic spectrum management method based on multiple use of spectrum as a solution to the existing radio spectrum management Supplementation and modification of the method to dynamically manage spectrum usage by unlicensed users. The present invention defines users (usually registered users of a certain wireless service operator) who have obtained authorized frequency bands through application and can use the allocated frequency bands without interference as authorized users; The user who does not affect the normal use of the frequency band by other authorized users (usually a temporary user alone or in a small group) is defined as an unlicensed user. Such unauthorized users should have some agile radio capability. This manual mainly studies the reuse of licensed frequency bands by unlicensed users to improve spectrum utilization.

In order to achieve the above object, the technical solution of the present invention is to add a new dynamic spectrum management system under the radio management organization to realize the reuse of the allocated spectrum by unlicensed users; the dynamic spectrum management system includes a dynamic spectrum management center, Frequency usage status database, spectrum monitoring unit, and the monitored actual radio frequency usage environment; among them, the dynamic spectrum management center directly receives spectrum applications from unlicensed users and completes the assignment of their spectrum under the guidance of management rules; the spectrum monitoring unit cycle To monitor changes in the wireless environment and report the monitoring results to the frequency usage database, which dynamically records and provides frequency usage data to the dynamic spectrum management center; non-authorized users and authorized users constitute the monitored actual Users in the wireless frequency usage environment; the management rules include application frame, distribution frame format, database query mode, and spectrum allocation mode; unauthorized users send applications to the dynamic spectrum management center in the form of application frames, and the dynamic spectrum management center is in the query method Under the guidance of the system, query the database, perform spectrum allocation, and reply the allocation results to unlicensed users in the form of allocation frames, realizing the frame format transmission of spectrum application and spectrum allocation information between unlicensed users and the dynamic spectrum management system.

The non-authorized user application process and the dynamic spectrum management center allocation process of the present invention rely on the network to realize, and the spectrum monitoring unit periodically monitors changes in the wireless environment, and feeds back the monitoring results to the spectrum usage database; the database makes corresponding actions according to the monitoring results Modify and record spectrum hole-related data in real time; when an unauthorized user generates a demand for spectrum, the demand information and personal related information will be formed into an application frame according to the application frame format, and automatically sent to the dynamic spectrum management center through the network; the dynamic spectrum management center After receiving the application frame, first analyze the information of the applicant user, and then query the spectrum usage database according to the principle of hole level first, then hole stability, and finally hole bandwidth, and compare user requirements with the queried available spectrum resources For comparison, select the appropriate spectrum for the application user, and form an allocation frame according to the allocation frame format requirements of the selection result, and automatically send it to the application user through the network, which completes the automatic application of unauthorized users and the automatic response of the dynamic spectrum management center , to realize automatic and rapid frequency application and allocation on communication lines.

The frequency application frame format and main parameters used by unauthorized users of the present invention are:

Application frame: 50 bits

Frame header Head: 8 bits

User registration number Number: 7 bits

User category Type: 1 bit

Application data Data: 23 bits

Emergency level Emergency: 1 bit

Power lower limit PowerDown: 8 bits,

Other Other: 2 bits are reserved.

The distribution frame format and main parameters used by the dynamic spectrum management center of the present invention are:

Allocation frame: 47 bits

Frame header Head: 8 bits

User registration number Number: 7 bits

Response status Response: 3 bits

Allocation data Data: 19 bits

Power Cap PowerUp: 8 bits

Other: 2 bits are reserved.

The present invention receives the application frame sent by the unauthorized user, the dynamic spectrum management center queries the database, sends the corresponding allocation frame, and performs frequency dynamic allocation:

If there is a frequency band that meets the requirements, set the response status Response in the allocation frame to 001, indicating that the unauthorized user has applied for a suitable frequency band, and fill in the detailed information about the applied frequency band in the allocation data item Data;

If there is no frequency band that meets the requirements, set the response status Response in the allocation frame to 011, indicating that the network is all busy and the application is rejected;

If the application information is not clear, set the response status Response in the allocation frame to 100, indicating that the information is not detailed and further negotiation is required;

If the application frame does not carry the user registration number Number, set the response status Response of the allocation frame to 000, indicating that the user will not be allocated as an invalid user;

If the allocation frame response status Response is set to 010, it means that the applied frequency band can be used after a period of delay due to some reasons.

Compared with the existing radio frequency spectrum management method, the present invention has the following characteristics: the newly added dynamic spectrum management system under the radio management organization directly completes the assignment of spectrum to unlicensed users without going through the existing spectrum allocation process The frequency band allocation process for wireless service operators. The spectrum application of unlicensed users and the spectrum allocation of the dynamic spectrum management system are different from the way of file transmission adopted by the existing radio spectrum management, but are completed automatically under the guidance of the frame format and management method.

Description of drawings

Figure 1 Spectrum utilization rate of each frequency point in the 935-960MHz frequency band for one day

Figure 2 Schematic diagram of existing radio spectrum management methods

Figure 3 Schematic diagram of the comparison between the existing radio spectrum allocation, assignment level and dynamic spectrum management assignment level

Figure 4 Schematic Diagram of the Structure and Management Method of the Dynamic Spectrum Management System

Figure 5 Dynamic Spectrum Management Center Database Query Flowchart

Figure 6 Dynamic Spectrum Management Center Allocation Flowchart

Figure 7 Schematic diagram of the main parameters of the application frame format

Figure 8 Schematic diagram of the main parameters of the allocated frame format

Figure 9 Frequency dynamic allocation process diagram

908～910MHzGSM frequency band wireless frequency spectrum usage status figure in the specific embodiment of Fig. 10

Figure 11 Request frame format expected to occupy a channel

Figure 12 corresponds to Figure 10, the allocation frame format of a successful application

Fig. 13 corresponds to the situation described in Fig. 10 and Fig. 11, and the spectrum monitoring unit monitors a wireless spectrum utilization status diagram of a frequency channel occupied by unlicensed users

Figure 14 Expected to occupy two consecutive channel application frame format

Figure 15 corresponds to Figure 13, the allocation frame format of a successful application

Figure 16 corresponds to the situation described in Figure 13 and Figure 14, and the spectrum monitoring unit monitors the wireless spectrum usage status diagram of two continuous channels used by unlicensed users to transmit services

Figure 17 The allocation frame format for which the application is rejected

Detailed ways

Referring to the above-mentioned accompanying drawings, the specific implementation manners of the present invention will be described in further detail.

Referring to Fig. 3, the present invention adds a dynamic spectrum management system under the existing radio spectrum management organization, and directly assigns frequencies to unlicensed users as a supplement and modification to the existing radio spectrum management method. The improved spectrum management system can provide spectrum management for authorized users according to the existing method, and provide spectrum management for unlicensed users according to the dynamic spectrum management method.

(1) The composition of the dynamic spectrum management system

Referring to Figure 4, the dynamic spectrum management system is composed of a dynamic spectrum management center, a frequency usage status database, a spectrum monitoring unit and the monitored actual radio spectrum usage environment. The dynamic spectrum management center directly receives spectrum applications from unlicensed users and completes spectrum assignment under the guidance of "rules"; the spectrum monitoring unit periodically monitors changes in the wireless environment and reports the monitoring results to frequency The use status database, the frequency use status database dynamically records and provides frequency use status data to the dynamic spectrum management center; non-authorized users and authorized users constitute users in the monitored actual wireless frequency use environment; the invention is used to guide dynamic The "rules" of the spectrum management system, that is, the dynamic spectrum management rules include application frames, allocation frame formats, database query methods, spectrum allocation methods, etc.; unauthorized users send applications to the dynamic spectrum management center in the form of application frames, and the dynamic spectrum management center is querying Under the guidance of the method, the database is queried, the spectrum is allocated, and the allocation result is replied to the unlicensed user in the form of allocation frame, which realizes the transfer of spectrum application and spectrum allocation information in frame format between the unlicensed user and the dynamic spectrum management system.

(2) Automatic and rapid frequency application and allocation on communication lines

Referring to Figure 5 and Figure 6, the application process of unauthorized users and the allocation process of the dynamic spectrum management center are completely implemented by the network. The spectrum monitoring unit periodically monitors changes in the wireless environment, and feeds back the monitoring results to the spectrum usage database, and the database makes corresponding changes according to these detection results. For example, when an authorized user ends the use of the authorized frequency band, the spectrum monitoring unit will monitor the power drop of this frequency band when performing periodic monitoring and report it to the spectrum usage status database immediately. The low power record of this frequency band in the database indicates that The band is free at this time. Once an unlicensed user generates a demand for spectrum, he will form an application frame with his own application information (such as calling location, required bandwidth, required hole stability, business type, reserved service time, etc.) according to the application frame format, and pass The network is automatically sent to the Dynamic Spectrum Management Center. After receiving the application frame, the dynamic spectrum management center first analyzes the information of the applicant user, and then, as shown in Figure 5, inquires the spectrum usage status under the guidance of the database first hole level, then hole stability, and finally hole bandwidth query method The database compares the user's requirements with the queried available spectrum resources, selects the appropriate frequency band for the applicant, and finally forms an allocation frame according to the allocation frame format requirements of the selection result, and automatically sends it to the applicant through the network. The process is shown in Figure 6. If the application is successful, the unlicensed user will access and use the frequency band immediately or after a period of delay after receiving the relevant information of the allocated frequency band. During the monitoring process, it was noticed that the monitoring results were also fed back to the spectrum usage status database. The high power record of this frequency band in the database indicates that the spectrum is not idle at this time, which completes the automatic application of unauthorized users and the dynamic spectrum management center. Automatic response to achieve automatic and fast frequency application and allocation on communication lines during the whole process of dynamic spectrum management.

(3) Unauthorized user frequency application frame format

Unlicensed users have spectrum requirements, but no dedicated channels are available, so they must apply to the dynamic spectrum management center for transmission services on idle channels not used by authorized users at this time. As an unauthorized user, the Dynamic Spectrum Management Center knows nothing about its user information and cannot allocate spectrum at all. This requires unauthorized users to transmit their personal information to the Dynamic Spectrum Management Center in a way that both parties agree with. The way is to apply for the frame format. Only through the application frames of unauthorized users can the dynamic spectrum management center know the specific information of the applicant users (such as required bandwidth, stability requirements, reservation time, etc.), and find suitable channels for them.

1. Application frame format and parameters

Referring to Fig. 7, according to the dynamic spectrum management rule, the application frame format and main parameters used by the unauthorized user of the present invention are as follows:

Application frame: 50 bits.

Head frame header: 8 bits

Number User registration number: 7 bits, the position of the applicant in the application queue. After the users arrive, they line up according to the requirements of business type and urgency to form an application queue. The queue can accommodate no more than 100 users.

Type User category: 1 bit.

1: It has a cognitive function, and does not need a dynamic spectrum management center to find available channels for it. It has spectrum monitoring and search functions, and automatically searches for suitable spectrum for it to use.

0: No cognitive function, and the dynamic spectrum management center needs to find suitable spectrum for it to use.

Data application data:

·Bandwidth used: 9 bits, the bandwidth required to complete its business transmission. Here it is assumed that unauthorized users apply for a frequency band to the GSM system and the application bandwidth does not exceed 400kHz, there are the following two situations:

Case 1: The requested bandwidth is less than or equal to 200kHz

Case 2: The requested bandwidth is greater than 200kHz and less than or equal to 400kHz

In the above two cases, the 9-bit representation is as follows, in kHz:

Case 1: 0××××××××, the highest bit 0 indicates that the bandwidth is less than or equal to 200, and the actual value is calculated from the last 8 bits.

Case 2: 1××××××××, the highest bit 1 indicates that the bandwidth is greater than 200 but less than or equal to 400, and the actual value is calculated by adding 200 to the number shown in the last 8 bits.

For example:

000100000 indicates that the bandwidth is less than or equal to 200kHz, and the last 8 bits 00100000 calculate 64kHz

100100000 indicates that the bandwidth is greater than 200kHz and less than or equal to 400kHz, 200 plus the last 8 bits 00100000 is calculated as 200+64=264(kHz)

·Using time: 6 bits, the transmission time required by the service, there are the following 3 situations:

Case 1: For services such as telephone calls and faxes, the transmission time is very short, less than or equal to 10 minutes

Case 2: For video services, etc., the transmission time is greater than 10 minutes and less than or equal to 60 minutes

Case 3: Transmission time of more than one hour

Corresponding to the above three situations, the 6-bit notation is as follows, and the unit is min:

Case 1: 00××××, the last four digits represent less than or equal to 10

Case 2: ××××××, a total of six digits means greater than 10 and less than or equal to 60

Case 3: 111111, means more than one hour

·Location of use: 2 bits, select the appropriate spectrum usage status database for the user.

00: Eastern District

01: South District

10: West End

11: North District

Stability: 2 bits, the expected hole stability for completing its service transmission.

00: low stability

01: medium stability

10: High stability

·Business type: 2 bits.

00: Voice

01: data

10: Video

Voice service: According to the characteristics of voice, the service traffic is small, the requirement of hole stability is not high, the real-time performance is strong, and the requirement of hole level is not high

Data business: The real-time requirements are not high, the business traffic is in the middle, the hole stability is in the middle, the accuracy is in the middle, and the hole level is in the middle

Video business: high real-time performance, large business traffic, the highest requirement for hole stability, high accuracy, and the highest requirement for hole level

·Caller's geographic location: 2 bits, the place where the requesting user is generated.

00: Eastern District

01: South District

10: West End

11: North District

Emergency urgency: 1 bit.

Emergency=1 Urgent needs to be dealt with immediately, with the highest priority

Emergency=0 non-emergency processing according to normal business priority

PowerDown power lower limit: 8 bits, the minimum transmit power required for normal transmission of its services.

Other: Other reserved 2 bits.

2. Application Regulations

·Condition: The user is an unauthorized user with agile radio function.

·Business volume: The business volume should not be too large, and the duration should not be too long, because the frequency spectrum holes are unstable and highly random.

(4) Dynamic Spectrum Management Center Allocation Frame Format

With the application result, the dynamic spectrum management center will return the application result to the applicant user in some way, and the unauthorized user can access the allocated frequency band or further apply according to the application result. This method is exactly the allocation frame format. There is only application without allocation, and the application is meaningless, and non-authorized users cannot realize frequency reuse. If the application is successful, the information about the applied frequency band will be returned. If the application information is unclear or the application is not successful, the dynamic spectrum management center will further exchange information with unauthorized users. This exchange process is also completed by the allocation frame.

Referring to Fig. 8, according to the dynamic spectrum management rule, the distribution frame format and main parameters used by the dynamic spectrum management center of the present invention are as follows:

Frame structure: 47 bits.

Head frame header: 8 bits.

Number User registration number: 7 bits, same as Number in the application frame format.

Response status: 3 bits.

000 Unregistered user, invalid

001 Allocated

010 Suspension of distribution (postponed)

011 busy, refused

100 If in doubt, negotiate again

Data allocation data: when the Response is 001, it is meaningful, 19 bits, if the Response is other, this item is empty.

· Center frequency 13 bits, the center frequency of the applied frequency band.

In the GSM system, 13 bits are represented as follows, in MHz:

The first 10 bits represent the integer digits of the frequency, the last 3 bits represent the decimal places, and the two are separated by

·Bandwidth 1 bit, the bandwidth of the applied frequency band. When applying for a GSM system channel and the bandwidth of the applied channel does not exceed 400kHz, it is represented by 1 bit as follows, and the unit is kHz

0:200 Apply for a GSM channel

1:400 Apply for two consecutive GSM channels. At this time, two allocation frames are combined to indicate that two consecutive channels have been applied for. Here, the bandwidths of the two allocated frames are both set to 1, indicating that one unauthorized user applies for two consecutive channels, rather than two unauthorized users applying for two channels respectively.

· Hole level 2 bits, applied to the hole level of the frequency band.

00: blank

01: gray empty

10: Black space

·The stability of the hole is 2 bits, which is the stability of the applied frequency band.

00: low stability

01: medium stability

10: High stability

·The best modulation method is 1 bit, and different services need to choose different modulation methods.

0: OFDM modulation

PowerUp power upper limit: 8 bits, unit W, the maximum power that does not affect the normal communication of other authorized users or unauthorized users.

Others: 2 bits are reserved.

(5) Frequency dynamic allocation process

The frequency dynamic allocation process is shown in Figure 9. Unauthorized users send application frames to the dynamic spectrum management center, and the dynamic spectrum management center queries the database, and then sends corresponding allocation frames. Different forms of allocation frames have different applications and meanings. If there is a frequency band that meets the requirements, set the Response in the allocation frame to 001, indicating that the unauthorized user has applied for a suitable frequency band, and fill in the detailed information about the applied frequency band in the Data item. If there is no frequency band that meets the requirements, set the Response in the allocation frame to 011, indicating that the network is all busy and the application is rejected. If the application information is unclear, set the Response in the allocation frame to 100, indicating that the information is not detailed and further negotiation is required. If the Response is set to 000, it means that the application frame does not carry the user registration number Number, and the user will not be assigned as an invalid user. If the Response is set to 010, it means that the applied frequency band will be used after a period of delay due to some reasons.

Referring to FIG. 10 , the monitoring unit in the dynamic spectrum management system monitors the use of wireless spectrum, such as involving the GSM frequency band of 908-910 MHz, and the channel interval is 200 kHz. The meaning of the graph is as follows: each rectangle represents a channel, the width of the rectangle corresponds to the channel bandwidth of 200kHz, the height of the rectangle corresponds to the channel power, the number below the rectangle indicates the center frequency of the channel, and the number in the rectangle indicates the hole stability, which is the channel in a day The probability of idleness, 1, 2, and 3 represent low, medium, and high hole stability, respectively. Dotted lines A and B passing through the rectangle are used to distinguish black space, gray space and white space. The height of the rectangle higher than A means that the channel is black space, that is, the channel is being used. The height of the rectangle lower than the dotted line B means that these channels are white space. That is, there is only background noise on the channel, and the channel whose rectangular height is between the dotted lines A and B is gray, that is, the power on this channel is relatively small, and it can also be used by unauthorized users. For example, the first rectangle represents a gray space with a center frequency of 908MHz, a bandwidth of 200kHz, and low hole stability. The meanings of other rectangles can be deduced in turn, so as to obtain the usage status of the wireless spectrum in the 908-910 MHz GSM frequency band.

When an unauthorized user sends an application to the dynamic spectrum management center, due to the different application information of the user, the query results obtained by the dynamic spectrum management center query database are different, and the subsequent changes in the wireless environment are different. Four embodiments are listed to further illustrate :

Embodiment 1, the unauthorized user sends the application frame format as shown in Figure 11: the meaning of each parameter is: Number 0101110, that is, the 2 ¹ + 2 2 ^{+ 2 3} + 2 ⁵ = 46 application users in the queue; Type 1 means no With cognitive radio function; the first item in Data 01011001 is the required bandwidth 2 ⁰ + 2 ³ + 2 ⁴ + 2 ⁶ = 89kHz, the second item 000011 is the actual required reservation 2 ⁰ + 2 ¹ = 3min, the third item 10 means that the call location is located in the west area, the fourth item 00 means that the hole stability is low, the fifth item 00 means the type of voice service, and the sixth item 10 means that the user who made the call is located in the west area; 0 in Emergency means a non-emergency call; 00001111 in PowerDown means It is guaranteed that the lower limit of the transmit power required by the user's basic service is 2 ⁰ +2 ¹ +2 ² +2 ³ =15W. The above user application information is summarized as follows: the 46th applicant in the queue does not have the cognitive radio capability, the required bandwidth is 89kHz, the scheduled call is 3 minutes, the call location is in the west area, the service type is voice, the hole stability is low, and the calling user Located in the West District, for non-emergency calls, the minimum power required for calls is 15W. The dynamic spectrum management center queries the database and finds a channel that meets the requirements, and sends the channel information to the user in the allocation frame. The format and parameters of the allocation frame are shown in Figure 12: Number0101110 is the 2nd ¹ +2 ² +2 ³ +2 ⁵ = 46 applicants; Response 1 has a suitable channel for allocation; the first item in Data 1110001101|000 means the center frequency of the allocated channel is 2 ⁰ + ^{2 2} + 2 ³ + 2 ⁷ + 2 ⁸ + 2 ⁹ ＝909MHz , the second item 0 means that the bandwidth of the applied channel is 200kHz, the third item 00 means blank space, the fourth item 00 means the hole stability is low, the fifth item 0 means the modulation method is OFDM modulation; PowerUp 00011110 means that in order not to affect other The transmission power of the user's normal communication should not be higher than 2 ¹ +2 ² +2 ³ +2 ⁴ =30W. The response information is: the 46th applicant successfully applied for the channel, the channel bandwidth is 200kHz, the center frequency is 909MHz, the space is empty, the stability of the hole is low, the OFDM modulation method is adopted, and the transmission power is less than 30W. After a period of time, when the user starts to use the channel, the spectrum monitoring unit will monitor the power change of the channel as shown in FIG. 13 . Notice that the power on the 909MHz channel exceeds the dotted line A, indicating that the channel is occupied at this time, and report it to the spectrum usage database immediately, so that it can be modified accordingly to indicate that this frequency band is not idle.

Embodiment 2. Unauthorized user application frame format is shown in Figure 14, except that the first item 101101010 in Data indicates that the required bandwidth is 2 ¹ + 2 ³ + 2 ⁵ + 2 ⁶ + 200 = 306kHz, and the meanings of other items are the same as those in Figure 11 exactly the same. Therefore, the user's application information is: the 46th applicant in the queue, does not have the cognitive radio capability, the required bandwidth is 306kHz, the scheduled call is 3 minutes, the call location is in the west area, the service type is voice, the required hole stability is low, the main If the caller is located in the West District and makes a non-emergency call, the minimum power required for the call is 15W. Note that this user requires a bandwidth of 306 kHz, more than one channel bandwidth but less than two consecutive channel bandwidths. The format of the allocation frame sent back by the Dynamic Spectrum Management Center after querying the database is shown in Figure 15: except for the first item 1110001100|100 and 1110001101|000 in Data, it means that the center frequency of the allocated channel is 2 ² +2 3 ^{+2 7} +2 ⁸ +2 ⁹ +2 ³ ×0.1＝908.8MHz and 2 ⁰ +2 ² +2 ³ +2 ⁷ +2 ⁸ +2 ⁹ ＝909MHz, the second item 1 means that the bandwidth of the applied channel is 400kHz, and the third item 00 means Blank space, the fourth item 01 and 00 indicate that the stability of the two adjacent channels is medium and low, and the other meanings are the same as those shown in Figure 12. So the response information is: the 46th applicant successfully applied for two consecutive channels, with a bandwidth of 400kHz, center frequencies of 908.8MHz and 909MHz, blank space, medium and low hole stability, OFDM modulation mode and transmission power less than 30W . After a period of time, the user starts to use the two consecutive channels, and the spectrum monitoring unit will monitor the power changes of the channels as shown in FIG. 16 . Notice that the power on both channels 908.8MHz and 909MHz exceeds the dotted line A, indicating that these two consecutive channels are occupied at this time, and immediately report to the spectrum usage database to make corresponding modifications to indicate that the two frequency bands are not idle.

Embodiment 3, in the frame format of an unauthorized user's application, except that the service type is set to data, other items are shown in FIG. 11 . In the corresponding allocation frame format, except that the center frequency of the applied frequency band is 908.4MHz and the hole stability is high, other items are shown in Figure 12. Since the data service requires high hole stability, a channel with high hole stability is selected. From this, it is known that different channels are selected for different transmission services of applicant users.

Embodiment 4, when the hole stability or bandwidth expected by unlicensed users cannot be met, or when there is no free channel in the applied frequency band at this time, the allocation frame format will be as shown in Figure 17, and the Number item represents the queue Among the 46 applicants, Response 011 said that they refused to allocate channels, and PowerUp said that the transmission power should not exceed 30W.

The above discussion discloses a dynamic spectrum management method based on multiple use of spectrum to improve spectrum utilization from the management point of view. Those skilled in the art will know that other embodiments can be obtained from the dynamic spectrum management method based on spectrum multiple usage proposed by the present invention without exceeding the scope of the claims.

Claims (4)

1, a kind of dynamic spectrum management method based on the multiple use of frequency spectrum, newly-increased Dynamic Spectrum Management system under radio management mechanism realizes that unauthorized user is to distributing the once more utilization of frequency spectrum when not using; Described Dynamic Spectrum Management system comprises Dynamic Spectrum Management center, frequency behaviour in service database, spectrum monitoring unit and monitored actual radio frequency spectrum environment for use; Wherein, the Dynamic Spectrum Management center under rule instructs, directly receive the frequency spectrum application of unauthorized user and finish its frequency spectrum assignment; The spectrum monitoring unit periodically the monitoring wireless environment variation and monitoring result reported to frequency behaviour in service database, the record of frequency behaviour in service Database Dynamic also provides frequency behaviour in service data to the Dynamic Spectrum Management center; Unauthorized user and authorized user have then constituted the user in the monitored actual wireless frequency spectrum environment for use; Described rule comprises the application frame, distributes frame format, data base querying mode and spectrum allocation may mode, and described application frame is that unauthorized user sends spectrum requirement application information and the used frame format of individual relevant information to the Dynamic Spectrum Management center; Described distribution frame format is the frame format that the application user is returned the spectrum allocation may result at the Dynamic Spectrum Management center; Described data base querying mode for the Dynamic Spectrum Management center receive the application frame after, at first application user's information is analyzed, then to database according to first empty grade, the inquiry mode of empty stability and last empty bandwidth again, enquiry frequency behaviour in service database; Described spectrum allocation may mode will be applied for customer requirements and the utilizable frequency spectrum resource that inquires for the Dynamic Spectrum Management center and be compared, and for the application user selects suitable frequency range, and distribute frame to answer the selection result formation and will apply for the user; Send the application frame by unauthorized user to the Dynamic Spectrum Management center, data query mode Query Database is pressed at the Dynamic Spectrum Management center, carry out spectrum allocation may, and, be implemented in and rely on network frame format transmissibility spectrum application and spectrum allocation may information between unauthorized user and the Dynamic Spectrum Management system the form answer unauthorized user of allocation result with the distribution frame.

2, according to right instructions for use 1 described dynamic spectrum management method based on the multiple use of frequency spectrum, it is characterized in that: frequency application frame format and major parameter that unauthorized user uses are as follows:

Application frame: 50 bits

Frame head Head:8 bit

User's number of registration Number:7 bit

Class of subscriber Type:1 bit

Request for data Data:23 bit

Urgency level Emergency:1 bit

Power lower limit PowerDown:8 bit

Other Other: keep 2 bits.

3, the dynamic spectrum management method based on the multiple use of frequency spectrum according to claim 1 is characterized in that: distribution frame format and the major parameter that use at the Dynamic Spectrum Management center are as follows:

Distribute frame: 47 bits

Frame head Head:8 bit

User's number of registration Number:7 bit

Response status Response:3 bit

Distribute data Data:19 bit

Power upper limit PowerUp:8 bit

Other Other: keep 2 bits.

4, according to claim 1 or 3 described dynamic spectrum management methods based on the multiple use of frequency spectrum, it is characterized in that: described Dynamic Spectrum Management center receive behind the application frame of unauthorized user, Query Database, according to the spectrum allocation may mode, send the corresponding frame that distributes, carry out frequency dynamic and distribute:

If satisfactory frequency range is arranged, will distribute the response status Response in the frame to be changed to 001, the application of expression unauthorized user is to suitable frequency range, and distribute data item Data fills in the details about the frequency range of applying for;

If there is not satisfactory frequency range, will distribute the response status Response in the frame to be changed to 011, the expression network is no-trunk, and application is rejected;

If application information is indeterminate, it is 100 that the response status in the distribution frame is put Response, and expression information is not exhaustive, needs further to consult;

If do not carry user's number of registration Number in the application frame, will distribute the response status Response in the frame to be changed to 000, expression is considered as inactive users and is not distributed;

If distribute the response status Response of frame to be changed to 010, the frequency range that expression is applied for is because could use after postponement a period of time of some reason.

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