CN104581740A

CN104581740A - Spectrum handover method and equipment based on cognitive radio

Info

Publication number: CN104581740A
Application number: CN201310493785.6A
Authority: CN
Inventors: 谭飞翔
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-10-18
Filing date: 2013-10-18
Publication date: 2015-04-29
Anticipated expiration: 2033-10-18
Also published as: CN104581740B

Abstract

The embodiment of the invention provides a spectrum handover method and equipment based on cognitive radio, relates to the field of communication, and aims to realize quick handover of base stations in the spectrum handover process to avoid disruption of user services. The method comprises the following steps: obtaining spectrum handover information after a base station determines to perform spectrum handover, using a BBU (Base Band Unit) to send the spectrum handover information to a remoter radio unit (RRU) of the base station through a CPRI (Common Public Radio Interface), and using the RRU to send the spectrum handover information to a terminal to enable the terminal to be handed over to a spectrum corresponding to an identification of a target spectrum from a current work spectrum according to a spectrum handover time. The method is applied to spectrum hand over.

Description

The method and apparatus that a kind of frequency spectrum based on cognitive radio switches

Technical field

The present invention relates to the communications field, particularly relate to the method and apparatus that a kind of frequency spectrum based on cognitive radio switches.

Background technology

CR(Cognitive Radio, cognitive radio) technology is the most promising technology solving current frequency spectrum resource anxiety.Current frequency spectrum Distursement is fixed allocation, namely government is that the specific transactions of specific user distributes fixing resource, as TV, broadcast, radar, navigation etc. all use fixing frequency spectrum, some of them frequency spectrum is not use always, so just there is some time period and some geographical position, partial frequency spectrum is used fully, and at present in the frequency spectrum of fixed allocation, there is a large amount of frequency spectrum fully not used, which results in the significant wastage of frequency spectrum resource.Cognitive radio is by cognitive radio spectrum environment, these vacant frequency spectrums occurred can be found whenever and wherever possible, and do not disturbing PU(Primary User, primary user) prerequisite under these frequency spectrums of dynamic access, thus the raising availability of frequency spectrum, wherein, the frequency usage user of this PU and former fixed allocation.

In the existing frequency spectrum based on cognitive radio scene switches, base station is after determining to carry out frequency spectrum switching, by BBU(Base band Unit, baseband processing unit) the frequency spectrum handover information got is sent to terminal, and at BBU, the frequency spectrum handover information got is sent in the process of terminal, BBU needs, by high-level signaling (application layer), this frequency spectrum handover information is sent to bottom (physical layer) by high-rise (application layer), and eventually through physical layer eat dishes without rice or wine this frequency spectrum handover information is sent to terminal, uncertain owing to issuing the time that this high-level signaling can receive this this high-level signaling to physical layer from high-rise (application layer), therefore, the delay that this frequency spectrum handover information transmits can be caused, thus the delay causing frequency spectrum to switch, like this, make base station cannot carry out frequency spectrum switching in time, thus cause the interruption of customer service, reduce Consumer's Experience.

Summary of the invention

The invention provides the method and apparatus that a kind of frequency spectrum switches, to realize the quick switching of base station in the process switched at frequency spectrum, thus avoid the interruption of customer service.

First aspect, a kind of method providing frequency spectrum based on cognitive radio to switch, comprising:

Base station, after determining to carry out frequency spectrum switching, obtains frequency spectrum handover information, and wherein, described frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum;

By Base Band Unit BBU, described frequency spectrum handover information is sent to the radio frequency remote unit RRU of described base station by CPRI interface;

By described RRU, described frequency spectrum handover information is sent to terminal, so that described terminal is according to the frequency spectrum of mark correspondence being switched to described frequency spectrum switching time described target spectrum by current frequency spectrums of operation.

In the first possible implementation of first aspect, describedly by Base Band Unit BBU, the radio frequency remote unit RRU that described frequency spectrum handover information is sent to described base station by CPRI interface to be comprised:

By described BBU, described frequency spectrum handover information is encapsulated as radio frames, and by described CPRI interface, described radio frames is sent to described RRU.

In conjunction with first aspect or the first possible implementation, in the implementation that the second is possible, describedly by BBU, the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface to be comprised:

By described BBU, described frequency spectrum handover information is sent to described RRU by the reservation control word in CPRI superframe.

In conjunction with first aspect or the first possible implementation, in the implementation that the third is possible, describedly by BBU, the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface to be comprised:

By described BBU, described frequency spectrum handover information is sent to described RRU by ethernet link.

In conjunction with first aspect or the first possible implementation, in the 4th kind of possible implementation, describedly by BBU, the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface to be comprised:

By described BBU, described frequency spectrum handover information is sent to described RRU by High-Level Data Link Control HDLC passage.

In conjunction with first aspect or the first possible implementation, in the 5th kind of possible implementation, describedly by BBU, the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface to be comprised:

By described BBU, described frequency spectrum handover information is sent to described RRU by digital baseband I/Q data passage.

Second aspect, a kind of method providing frequency spectrum based on cognitive radio to switch, comprising:

Terminal receives by RRU the frequency spectrum handover information that base station sends, and wherein, described frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum;

By RRU, described frequency spectrum handover information is sent to BBU by CPRI interface, so that described BBU obtains mark and described frequency spectrum switching time of described target spectrum according to described frequency spectrum handover information;

By described BBU, the mark of described target spectrum and described frequency spectrum are sent to RRU by described CPRI interface switching time, so that described RRU is according to the frequency spectrum of mark correspondence described frequency spectrum switching time described terminal being switched to described target spectrum by current frequency spectrums of operation.

In the first possible implementation of second aspect, describedly by described BBU, the mark of described target spectrum and described frequency spectrum are sent to RRU by described CPRI interface switching time and comprise:

By described BBU, the mark of described target spectrum and described frequency spectrum are sent to described RRU by the reservation control word in CPRI superframe switching time.

In the implementation that second aspect the second is possible, describedly by described BBU, the mark of described target spectrum and described frequency spectrum are sent to RRU by described CPRI interface switching time and comprise:

By described BBU, the mark of described target spectrum and described frequency spectrum are sent to described RRU by ethernet link switching time.

In the third possible implementation of second aspect, the RRU that the mark of described frequency spectrum switching time and described target spectrum is sent to described terminal is comprised by described CPRI interface by the BBU of described terminal:

By described BBU, the mark of described target spectrum and described frequency spectrum are sent to described RRU by High-Level Data Link Control HDLC passage switching time.

In second aspect the 4th kind of possible implementation, the RRU that the mark of described frequency spectrum switching time and described target spectrum is sent to described terminal is comprised by described CPRI interface by the BBU of described terminal:

By described BBU, the mark of described target spectrum and described frequency spectrum are sent to described RRU by digital baseband I/Q data passage switching time.

The third aspect, provides a kind of base station, comprising: Base Band Unit BBU and radio frequency remote unit RRU;

Described BBU, for after determining to carry out frequency spectrum switching, obtains frequency spectrum handover information, and described frequency spectrum handover information is sent to described RRU by CPRI interface, and wherein, described frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum;

Described RRU, is sent to terminal for the frequency spectrum handover information obtained by described BBU, so that described terminal is according to the frequency spectrum of mark correspondence being switched to described frequency spectrum switching time described target spectrum by current frequency spectrums of operation;

Described RRU also for, described base station is switched to the frequency spectrum of the mark correspondence of described target spectrum switching time by the frequency spectrum sent according to described BBU by current spectral.

In the first possible implementation of the third aspect, described BBU specifically for, described frequency spectrum handover information is encapsulated as radio frames, and by described CPRI interface, described radio frames is sent to described RRU.

In conjunction with the third aspect or the first possible implementation, in the implementation that the second is possible, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by the reservation control word in CPRI superframe.

In conjunction with the third aspect or the first possible implementation, in the implementation that the third is possible, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by ethernet link.

In conjunction with the third aspect or the first possible implementation, in the 4th kind of possible implementation, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by High-Level Data Link Control HDLC passage.

In conjunction with the third aspect or the first possible implementation, in the 5th kind of possible implementation, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by digital baseband I/Q data passage.

Fourth aspect, provides a kind of terminal, comprising: Base Band Unit BBU and radio frequency remote unit RRU;

Described RRU, for receiving the frequency spectrum handover information that base station sends, is sent to BBU by described frequency spectrum handover information by CPRI interface, and wherein, described frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum;

Described BBU, the frequency spectrum handover information for sending according to described RRU obtains mark and described frequency spectrum switching time of described target spectrum, and the mark of described target spectrum and described frequency spectrum are sent to RRU by described CPRI interface switching time;

Described RRU also for, according to the frequency spectrum of mark correspondence described frequency spectrum switching time described terminal being switched to described target spectrum by current frequency spectrums of operation.

In the first possible implementation of fourth aspect, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by the reservation control word in CPRI superframe switching time.

In the implementation that fourth aspect the second is possible, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by ethernet link switching time.

In the third possible implementation of fourth aspect, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by High-Level Data Link Control HDLC passage switching time.

In fourth aspect the 4th kind of possible implementation, described RRU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by digital baseband I/Q data passage switching time.

By adopting such scheme, the frequency spectrum handover information got is sent to the RRU of base station by base station by CPRI interface by BBU, and by this RRU, this frequency spectrum handover information is sent to terminal, to realize the synchronism switching of the frequency spectrum of base station and terminal, like this, because the CPRI interface between BBU and RRU is the interface of physical layer, therefore, frequency spectrum handover information is directly transferred to RRU by physical layer by the BBU of base station, and eventually through RRU, this frequency spectrum handover information is sent to terminal, do not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The schematic flow sheet of a kind of frequency spectrum switching method based on cognitive radio that Fig. 1 provides for the embodiment of the present invention;

The another kind that Fig. 2 provides for the embodiment of the present invention is based on the schematic flow sheet of the frequency spectrum switching method of cognitive radio;

The Signalling exchange schematic diagram of a kind of frequency spectrum switching method based on cognitive radio that Fig. 3 provides for the embodiment of the present invention;

The structural representation of a kind of base station that Fig. 4 provides for the embodiment of the present invention;

The structural representation of a kind of terminal that Fig. 5 provides for the embodiment of the present invention.

Embodiment

For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment below in conjunction with accompanying drawing, technical scheme provided by the invention is described in further detail.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention is applied to cognitive radio scene system, within the system, frequency spectrum detection is carried out in base station, when base station detects that primary user appears at the frequency spectrum of present terminal use, base station obtains frequency spectrum handover information according to testing result, and by BBU, this frequency spectrum handover information is sent to the RRU (Radio Remote Unit, wireless extension unit) of this base station, by this RRU, this frequency spectrum handover information is sent to terminal.

Terminal obtains this frequency spectrum handover information by RRU and BBU, and by RRU, described terminal is switched to target spectrum by current spectral according to this frequency spectrum handover information, to avoid causing interference to primary user.

A kind of method that the embodiment of the present invention provides frequency spectrum based on cognitive radio to switch, as shown in Figure 1, the executive agent of the method is base station, and the method comprises:

S101, base station, after determining to carry out frequency spectrum switching, obtain frequency spectrum handover information.

Wherein, this frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum, and the time that this frequency spectrum switches is the time that frequency spectrum switching is carried out in this base station, and this target spectrum is the object frequency spectrum that frequency spectrum switching is carried out in this base station.

Particularly, base station detects that on current spectral primary user occurs, then determine to carry out frequency spectrum switching, and determines frequency spectrum switching time, and from the list of the usable spectrum self stored, determine that idle frequency spectrum is as target spectrum.

S102, base station by BBU by this frequency spectrum handover information by CPRI(Common Public Radio Interface, general public wave point) interface is sent to the RRU of this base station.

Particularly, this frequency spectrum handover information is encapsulated as radio frames by this BBU by base station, and by this CPRI interface, this radio frames is sent to this RRU.

Wherein, in existing CPRI agreement, define a kind of CPRI superframe, this CPRI superframe comprises control word and data, and is made up of 256 basic frames (frame number can be designated as 0 to 255), and 150 superframes form a radio frames; Because a basic frame comprises 1 control word, therefore, a CPRI superframe comprises 256 control words (control font size and can be designated as 0 to 255), and these 256 control words are divided into again 64 subchannels, and each subchannel comprises 4 control words, as shown in the table:

Wherein, manufacturer's specified control word can by manufacturer's self-defining function of distinct device.

Particularly, the RRU that this frequency spectrum handover information is sent to this base station by CPRI interface can be comprised following four kinds of modes by BBU by base station:

Mode one: this frequency spectrum handover information is sent to this RRU by the reservation control word in CPRI superframe by this BBU by base station.

Particularly, owing to retaining the control word that control word is the free time, do not comprise any information, therefore the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum can be arranged in this reservation control word by the BBU of base station, and is sent to the RRU of base station by CPRI interface.

Alternatively, the mark of this frequency spectrum switching time and this target spectrum can be arranged in same reservation control word to be transmitted, certainly, the mark of this frequency spectrum switching time and this target spectrum also can be arranged in different reservation control words, and the present invention is not construed as limiting this.

Such as, this frequency spectrum to be arranged on and to control font size switching time by base station is in the control word of 15, and the mark of this target spectrum is arranged on to control font size be in the control word of 79, and just illustrate here, the present invention is not construed as limiting this.

In addition, the form of the basic frame that the above-mentioned control field comprising the mark of frequency spectrum switching time and this target spectrum is corresponding can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

This basic frame is encapsulated as radio frames by the BBU of base station, and is sent to the RRU of base station by CPRI interface, thus the mark of this frequency spectrum switching time and target spectrum is sent to the RRU of this base station.

Mode two: this frequency spectrum handover information is sent to this RRU by ethernet link by BBU by base station.

Wherein, this ethernet link is used for transmitting high speed data.

Particularly, the mark of the frequency spectrum switching time in this frequency spectrum handover information and target spectrum is arranged in control word corresponding to this ethernet link (control word of the quick control maintenance channel namely in above-mentioned table) by the BBU of base station, and is sent to the RRU of this base station by this CPRI interface.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Mode three: base station by BBU by this frequency spectrum handover information by HDLC(High level Data Link Control, High-Level Data Link Control) passage is sent to this RRU.

Wherein, this HDLC passage is for transmitting low speed data.

Particularly, the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum is arranged in control word corresponding to this HDLC passage (control word controlling at a slow speed maintenance channel namely in above-mentioned table) by the BBU of base station, and is sent to this base station RRU by CPRI interface.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Mode four: base station by BBU by this frequency spectrum handover information by IQ(In-phase Quadrature, digital baseband) data channel is sent to this RRU.

Wherein, I/Q data passage is used for service data transmission between BBU and RRU of base station, and this business datum is the form of IQ inphase quadrature.

Particularly, the BBU of base station is when sending I/Q data to the RRU of this base station, the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum is added in this I/Q data, thus the mark of this frequency spectrum switching time and this target spectrum is sent to the RRU of this base station.

In addition, the form of corresponding in transmission I/Q data process basic frame can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

The RRU of this base station after receiving this frequency spectrum handover information, according to the frequency spectrum of the mark correspondence frequency spectrum switching time in this frequency spectrum handover information this base station being switched to this target spectrum by the mark of current goal frequency spectrum.

Alternatively, because the position of base station immobilizes, therefore, BBU time delay in the process transmitting basic frame to the RRU of base station of base station is fixing, in addition, duration due to basic frame is fixing (265 nanosecond), the BBU of base station is after getting frequency spectrum switching time, according to the duration of basic frame, this frequency spectrum is converted to the quantity of corresponding basic frame switching time, and the effective marker position of the basic frame comprising this of section is set to significance bit (being such as set to 1) switching time, and the quantity of this basic frame is sent to the RRU of this base station, the RRU of base station is receiving this basic frame and after determining that the effective marker position of this basic frame is significance bit, quantity according to this basic frame counts, when the quantity of subsequently received basic frame reaches the quantity of this basic frame, the RRU of base station carries out frequency spectrum switching.

Such as, the BBU of base station determines that being divided into line frequency spectrum 7: 30 switches, and determine to send frequency spectrum switching time at 7: 20 RRU to base station, duration due to basic frame is fixing, time period (10 minutes) between 7: 20 to 7: 30 is converted into the quantity of corresponding basic frame by the BBU of base station, and the quantity of this basic frame is sent to the RRU of base station, then the RRU of base station is after the quantity receiving this basic frame, quantity according to frame basic in this radio frames counts, when the quantity of subsequently received basic frame reaches the quantity of this basic frame, the RRU of base station carries out frequency spectrum switching.

Alternatively, if the time period that the RRU of the true directional base station of the BBU of base station sent between the time of frequency spectrum switching time and this frequency spectrum switching time is oversize, the quantity of then corresponding basic frame can be very many, thus make the counting of basic frame very large, in order to simplify, a 10ms radio frames can be divided into 2 5ms wireless frame period, be designated as a 5ms radio frames and the 2nd 5ms radio frames respectively, like this, when the BBU of base station determines to carry out frequency spectrum switching in the moment that the 2nd 5ms radio frames is corresponding, this frequency spectrum can be converted to when the 2nd 5ms radio frames arrives switching time by the BBU of base station, also need the quantity of the basic frame received and the quantity of this basic frame be sent to the RRU of base station, the RRU of base station is when determining to receive the 2nd 5ms radio frames, start the quantity recording the basic frame received, when the quantity of basic frame determining to receive is identical with the quantity of the basic frame that the BBU of base station sends, the RRU of this base station carries out frequency spectrum switching.

Such as, the one 5ms radio frames time period of corresponding 7 o'clock to 7: 15, the 2nd 5ms radio frames time period of corresponding 7: 15 to 7: 30, if the BBU of base station determines that being divided into line frequency spectrum 7: 20 switches, and determine to send frequency spectrum switching time at 7: 10 RRU to base station, the frequency spectrum received then to be converted to the quantity of basic frame corresponding to time period between 7: 15 with 7: 20 switching time by the BBU of base station, like this, after the quantity of the basic frame that the RRU of base station sends at the BBU receiving this base station, start the quantity recording the basic frame received, when the quantity of basic frame determining to receive is identical with the quantity of the basic frame that the BBU of base station sends, the RRU of this base station carries out frequency spectrum switching.The above just illustrates, is not construed as limiting.

This frequency spectrum handover information is sent to terminal by this RRU by S103, base station, so that this terminal is according to the frequency spectrum of mark correspondence being switched to this frequency spectrum switching time this target spectrum by current frequency spectrums of operation.

Particularly, this frequency spectrum handover information is encapsulated as radio frames by this RRU by base station, and the RRU of terminal is sent to by eating dishes without rice or wine, the RRU of terminal receives the radio frames that the RRU from base station sends by eating dishes without rice or wine, and by CPRI interface, radio frames is sent to the BBU of terminal, the BBU of terminal obtains frequency spectrum handover information by resolving this radio frames, and this spectral shaping handover information is sent to the RRU of terminal by CPRI interface, so that the RRU of this terminal obtains the mark of frequency spectrum switching time in this frequency spectrum handover information and target spectrum.When reaching this frequency spectrum switching time, this terminal is switched to the frequency spectrum of the mark correspondence of this target spectrum by the RRU of this terminal by current spectral, thus realizes the synchronism switching with the frequency spectrum of base station.

It should be noted that, because terminal is in moveable state, when terminal is moved, the fiducial time of the RRU of terminal and the RRU of base station may be asynchronous, therefore, if the BBU of terminal obtains frequency spectrum switching time be the concrete moment, then the BBU of terminal is before reaching this concrete moment, RRU to terminal sends section switching time, wherein, this, section was the time period that the BBU of this concrete moment and this terminal determines to send between the moment of this frequency spectrum switching time switching time, now, the BBU of terminal needs the effective marker position (this effective marker position can be arranged in the frame head of basic frame) comprised in the basic frame of this of section to be set to significance bit (being such as set to 1) switching time, the RRU of terminal is when receiving the radio frames comprising this basic frame, if determine, the effective marker position of this basic frame is significance bit, then the RRU of terminal starts to record this of section switching time, when meter section this full switching time, then the RRU of this terminal carries out frequency spectrum switching according to the mark of target spectrum, thus this terminal is switched to target spectrum by current spectral.

Such as, in 7 o'clock sharps, the BBU of base station informs that the BBU of terminal carries out frequency spectrum switching 7: 30 (i.e. concrete moment), when the BBU of terminal determined this concrete moment to be sent to the RRU of terminal at 7: 20, the effective marker position comprised in the basic frame in this concrete moment is set to 1 by the BBU of terminal, and determine that the BBU of this terminal time period determining to send between the moment (namely 7: 20) in this concrete moment and concrete moment (7: 30) is 10 minutes (i.e. switching time section), and this of section is sent to switching time the RRU of terminal, the RRU of terminal is when the effective marker position determining this basic frame is 1, start to record this section switching time (namely 10 minutes), when this of section is designated as 0(i.e. record from 10 minutes switching time, often just this is subtracted 1 minute in 10 minutes after one minute, until be kept to 0) time, the RRU of this terminal carries out frequency spectrum switching according to the mark of target spectrum, thus this terminal is switched to target spectrum by current spectral, here just illustrate, be not construed as limiting.

In the another kind of possible implementation of the present invention, if the BBU of terminal receives frequency spectrum switching time be a time period, the BBU of terminal is when sending this time period to the RRU of terminal, this time period is needed to be converted to the concrete moment, and obtain section switching time between moment that this concrete moment and this terminal determine to send this time period by this concrete moment, the effective marker position of the basic frame comprising this of section is set to significance bit (being such as set to 1) switching time, the RRU of terminal is when receiving this basic frame, if determine, this effective marker position is significance bit, then the RRU of terminal starts to record this of section switching time, when meter section this full switching time, then the RRU of this terminal carries out frequency spectrum switching according to the mark of target spectrum, thus this terminal is switched to target spectrum by current spectral.

It should be noted that, when not comprising frequency spectrum switching time in this basic frame, then the effective marker position in this basic frame is invalid bit (being namely set to 0).

By adopting executive agent to be the scheme of base station, due to base station BBU and RRU between CPRI interface be the interface of physical layer, therefore, frequency spectrum handover information is directly transferred to RRU by physical layer by the BBU of base station, and eventually through RRU, this frequency spectrum handover information is sent to terminal, do not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

A kind of method that the embodiment of the present invention provides frequency spectrum based on cognitive radio to switch, as shown in Figure 2, the executive agent of the method is terminal, and the method comprises:

S201, terminal receive the frequency spectrum handover information of base station transmission by RRU.

This frequency spectrum handover information is sent to BBU by CPRI interface by RRU by S202, terminal, so that this BBU obtains mark and this frequency spectrum switching time of this target spectrum according to this frequency spectrum handover information.

Particularly, the RRU of terminal receives the radio frames that the RRU from base station sends by eating dishes without rice or wine, and by CPRI interface, radio frames being sent to the BBU of terminal, the BBU of terminal obtains frequency spectrum handover information by resolving this radio frames, thus obtains mark and frequency spectrum switching time of target spectrum.

The mark of this target spectrum and this frequency spectrum are sent to RRU by this CPRI interface by this BBU switching time by S203, terminal, so that this RRU is according to the frequency spectrum of mark correspondence this frequency spectrum switching time this terminal being switched to this target spectrum by current frequency spectrums of operation.

In existing CPRI agreement, define a kind of CPRI superframe, this CPRI superframe comprises control word and data, and is made up of 256 basic frames (frame number can be designated as 0 to 255), and 150 superframes form a radio frames; Because a basic frame comprises 1 control word, therefore, a CPRI superframe comprises 256 control words (control font size and can be designated as 0 to 255), and these 256 control words are divided into again 64 subchannels, and each subchannel comprises 4 control words, as shown in the table:

Particularly, the mark of this target spectrum and this frequency spectrum are sent to RRU by this CPRI interface by this BBU can comprise following four kinds of modes switching times by terminal:

Mode one: the mark of this target spectrum and this frequency spectrum are sent to this RRU by the reservation control word in CPRI superframe by this BBU switching time by terminal.

Particularly, owing to retaining the control word that control word is the free time, do not comprise any information, therefore the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum can be arranged in this reservation control word by the BBU of terminal, and is sent to the RRU of terminal by CPRI interface.

Alternatively, the mark of this frequency spectrum switching time and this target spectrum can be arranged on same reservation and control to transmit in son, certainly, the mark of this frequency spectrum switching time and this target spectrum also can be arranged in different reservation control words, and the present invention is not construed as limiting this.

Such as, this frequency spectrum to be arranged on and to control font size switching time by the BBU of terminal is in the control word of 15, and the mark of this target spectrum is arranged on to control font size be in the control word of 79, and just illustrate here, the present invention is not construed as limiting this.

Frame head

Frequency spectrum switching time

The mark of target spectrum

This basic frame is encapsulated as radio frames by the BBU of terminal, and is sent to the RRU of terminal by CPRI interface, thus the mark of this frequency spectrum switching time and target spectrum is sent to the RRU of this terminal.

Mode two: the mark of this target spectrum and this frequency spectrum are sent to this RRU by ethernet link by this BBU switching time by terminal.

Wherein, this ethernet link is used for transmitting high speed data.

Particularly, the mark of the frequency spectrum switching time in this frequency spectrum handover information and target spectrum is arranged in control word corresponding to this ethernet link (control word of the quick control maintenance channel namely in above-mentioned table) by the BBU of terminal, and is sent to the RRU of terminal by this CPRI interface.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Mode three: the mark of this target spectrum and this frequency spectrum are sent to this RRU by High-Level Data Link Control HDLC passage by this BBU switching time by terminal.

Wherein, this HDLC passage is for transmitting low speed data.

Particularly, the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum is arranged in control word corresponding to this HDLC passage (control word controlling at a slow speed maintenance channel namely in above-mentioned table) by the BBU of terminal, and is sent to the RRU of terminal by CPRI interface.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Mode four: the mark of this target spectrum and this frequency spectrum are sent to this RRU by digital baseband I/Q data passage by this BBU switching time by terminal.

Wherein, I/O data passage is used for service data transmission between the BBU and the RRU of this terminal of terminal, and this business datum is the form of IQ inphase quadrature.

Particularly, the mark of the frequency spectrum switching time in this frequency spectrum handover information and this target spectrum, when sending I/Q data, is added in this I/Q data by the BBU of terminal, thus the mark of this frequency spectrum switching time and this target spectrum is sent to the RRU of this terminal.

In addition, the form of corresponding in transmission I/O data process basic frame can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Similarly, base station is after determining to carry out frequency spectrum switching, obtain frequency spectrum handover information, by BBU, this frequency spectrum handover information is encapsulated as radio frames, and by this CPRI interface, this radio frames is sent to this RRU, the RRU of this base station, after receiving this frequency spectrum handover information, according to the frequency spectrum of the mark correspondence frequency spectrum switching time in this frequency spectrum handover information this base station being switched to this target spectrum by the mark of current goal frequency spectrum, thus realizes the synchronism switching of the frequency spectrum of base station and terminal.

By adopting executive agent to be the scheme of terminal, the frequency spectrum handover information of acquisition listened CPRI interface to be sent to the RRU of base station by the BBU of base station, the frequency spectrum handover information that the RRU that terminal receives base station by RRU sends, and by CPRI interface, this frequency spectrum handover information is sent to the BBU of terminal, the BBU of this terminal obtains the mark of frequency spectrum switching time and target spectrum according to this frequency spectrum handover information, thus the synchronism switching of frequency spectrum is completed according to the mark of frequency spectrum switching time and target spectrum and this base station, like this, because the interface between BBU and RRU of base station and BBU and RRU of terminal is the interface of physical layer, like this, the transmission of frequency spectrum handover information does not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

A kind of method that the embodiment of the present invention provides frequency spectrum based on cognitive radio to switch, as shown in Figure 3, the method comprises:

S301, base station, after determining to carry out frequency spectrum switching, obtain frequency spectrum handover information.

Particularly, the BBU of base station detects that on current spectral primary user occurs, then determine to carry out frequency spectrum switching, and determines frequency spectrum switching time, and from the list of the usable spectrum self stored, determine that idle frequency spectrum is as target spectrum.

S302, by BBU, this frequency spectrum handover information is sent to the RRU of this base station by CPRI interface.

Particularly, this frequency spectrum handover information is encapsulated as radio frames by this BBU by base station, and this radio frames is sent to the RRU of base station by this CPRI interface.

Frame head

Frequency spectrum switching time

The mark of target spectrum

Wherein, this ethernet link is used for transmitting high speed data.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Mode three: this frequency spectrum handover information is sent to this RRU by High-Level Data Link Control HDLC passage by BBU by base station.

Wherein, this HDLC passage is for transmitting low speed data.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Frame head

Frequency spectrum switching time

The mark of target spectrum

Frequency spectrum handover information is sent to the RRU of terminal by the RRU of S303, base station by eating dishes without rice or wine.

Particularly, this frequency spectrum handover information is encapsulated as radio frames by eating dishes without rice or wine by the RRU of base station, and this radio frames is sent to the RRU of terminal by eating dishes without rice or wine.

Frequency spectrum handover information is sent to terminal BBU by CPRI interface by the RRU of S304, terminal.

Particularly, after the radio frames that the RRU of terminal receives base station RRU by eating dishes without rice or wine sends, this radio frames is sent to the BBU of terminal by CPRI interface.

It should be noted that, this frequency spectrum handover information can be sent to four kinds of modes of the RRU of this base station in base station in refer step S302 by the specific implementation of this step by CPRI interface by BBU, repeated no more herein.

The BBU of S305, terminal is according to the mark obtaining frequency spectrum switching time and target spectrum of this frequency spectrum handover information.

The mark of this frequency spectrum switching time and this target spectrum is sent to the RRU of terminal by the BBU of S306, terminal by CPRI interface.

Particularly, the BBU of terminal resolves this radio frames, obtains the mark of this frequency spectrum switching time and target spectrum, and the mark of this frequency spectrum switching time and target spectrum is sent to the RRU of terminal by CPRI interface.

The RRU of S307, terminal is according to the frequency spectrum of mark correspondence this frequency spectrum switching time this terminal being switched to this target spectrum by current frequency spectrums of operation.

The RRU of S308, base station is according to the frequency spectrum of mark correspondence this frequency spectrum switching time this base station being switched to this target spectrum by current frequency spectrums of operation.

It should be noted that, because the position of base station immobilizes, therefore, BBU time delay in the process transmitting basic frame to the RRU of base station of base station is fixing, in addition, duration due to basic frame is fixing (265 nanosecond), the BBU of base station is after getting frequency spectrum switching time, according to the duration of basic frame, this frequency spectrum is converted to the quantity of corresponding basic frame switching time, and the effective marker position of the basic frame comprising this of section is set to significance bit (being such as set to 1) switching time, and the quantity of this basic frame is sent to the RRU of this base station, the RRU of base station is receiving this basic frame and after determining that the effective marker position of this basic frame is significance bit, quantity according to this basic frame counts, when the quantity of subsequently received basic frame reaches the quantity of this basic frame, the RRU of base station carries out frequency spectrum switching.

By adopting such scheme, because the interface between BBU and RRU of base station and BBU and RRU of terminal is the interface of physical layer, like this, the transmission of frequency spectrum handover information does not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

It should be noted that, for said method embodiment, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.

The embodiment of the present invention provides a kind of base station 40, and as shown in Figure 4, this base station 40 comprises BBU41 and RRU42,

This BBU41, for after determining to carry out frequency spectrum switching, obtains frequency spectrum handover information, and this frequency spectrum handover information is sent to this RRU by CPRI interface.

Wherein, this frequency spectrum handover information comprises mark and frequency spectrum switching time of target spectrum.

This RRU42, is sent to terminal for the frequency spectrum handover information obtained by this BBU41, so that this terminal is according to the frequency spectrum of mark correspondence being switched to this frequency spectrum switching time this target spectrum by current frequency spectrums of operation.

This RRU42 also for, this base station is switched to the frequency spectrum of the mark correspondence of this target spectrum switching time by the frequency spectrum sent according to this BBU41 by current spectral.

Further, this BBU41 specifically for, this frequency spectrum handover information is encapsulated as radio frames, and by this CPRI interface, this radio frames is sent to this RRU.

Alternatively, this BBU41 specifically for, this frequency spectrum handover information is sent to this RRU42 by the reservation control word in CPRI superframe.

It should be noted that, the mark of this frequency spectrum switching time and this target spectrum can be arranged in same reservation control word to be transmitted, certainly, the mark of this frequency spectrum switching time and this target spectrum also can be arranged in different reservation control words, and the present invention is not construed as limiting this.

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU41 specifically for, this frequency spectrum handover information is sent to this RRU42 by ethernet link.

Wherein, this ethernet link is used for transmitting high speed data.

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU41 specifically for, this frequency spectrum handover information is sent to this RRU42 by High-Level Data Link Control HDLC passage.

Wherein, this HDLC passage is for transmitting low speed data.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU41 specifically for, this frequency spectrum handover information is sent to this RRU42 by digital baseband I/Q data passage.

Frame head

Frequency spectrum switching time

The mark of target spectrum

It should be noted that, the RRU of terminal receives the frequency spectrum handover information of the RRU transmission of base station by eating dishes without rice or wine, and this frequency spectrum handover information is sent to the BBU of terminal, the BBU of terminal obtains the mark of frequency spectrum switching time and target spectrum according to this frequency spectrum handover information, and the mark of this frequency spectrum switching time and target spectrum is sent to the RRU of terminal, so that the RRU of this terminal is according to the frequency spectrum of mark correspondence this frequency spectrum switching time this terminal being switched to this target spectrum by current frequency spectrums of operation.

Alternatively, because terminal is in moveable state, when terminal is moved, the fiducial time of the RRU of terminal and the RRU of base station may be asynchronous, therefore, if the BBU of terminal obtains frequency spectrum switching time be the concrete moment, then the BBU of terminal is before reaching this concrete moment, RRU to terminal sends section switching time, wherein, this, section was the time period that the BBU of this concrete moment and this terminal determines to send between the moment of this frequency spectrum switching time switching time, now, the BBU of terminal needs the effective marker position (this effective marker position can be arranged in the frame head of basic frame) comprised in the basic frame of this of section to be set to significance bit (being such as set to 1) switching time, the RRU of terminal is when receiving the radio frames comprising this basic frame, if determine, the effective marker position of this basic frame is significance bit, then the RRU of terminal starts to record this of section switching time, when meter section this full switching time, then the RRU of this terminal carries out frequency spectrum switching according to the mark of target spectrum, thus this terminal is switched to target spectrum by current spectral.

By adopting above-mentioned base station, due to base station BBU and RRU between CPRI interface be the interface of physical layer, therefore, frequency spectrum handover information is directly transferred to RRU by physical layer by the BBU of base station, and eventually through RRU, this frequency spectrum handover information is sent to terminal, do not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

Affiliated those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the base station of foregoing description and description, with reference to the corresponding process in the embodiment of the method shown in earlier figures 1, can not repeat them here.

The embodiment of the present invention provides a kind of terminal 50, and as shown in Figure 5, this terminal 50 comprises: BBU51 and RRU52;

This RRU52, for receiving the frequency spectrum handover information that base station sends, is sent to BBU51 by this frequency spectrum handover information by CPRI interface.

This BBU51, the frequency spectrum handover information for sending according to this RRU52 obtains mark and this frequency spectrum switching time of this target spectrum, and the mark of this target spectrum and this frequency spectrum are sent to RRU52 by this CPRI interface switching time.

This RRU52 also for, according to the frequency spectrum of mark correspondence this frequency spectrum switching time this terminal being switched to this target spectrum by current frequency spectrums of operation.

Alternatively, this BBU51 specifically for, the mark of this target spectrum and this frequency spectrum are sent to this RRU52 by the reservation control word in CPRI superframe switching time.

It should be noted that, the mark of this frequency spectrum switching time and this target spectrum can be arranged on same reservation and control to transmit in son, certainly, the mark of this frequency spectrum switching time and this target spectrum also can be arranged in different reservation control words, and the present invention is not construed as limiting this.

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU51 specifically for, the mark of this target spectrum and this frequency spectrum are sent to this RRU52 by ethernet link switching time.

Wherein, this ethernet link is used for transmitting high speed data.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU51 specifically for, the mark of this target spectrum and this frequency spectrum are sent to this RRU52 by High-Level Data Link Control HDLC passage switching time.

Wherein, this HDLC passage is for transmitting low speed data.

The form of the basic frame of its correspondence can be following form:

Frame head

Frequency spectrum switching time

The mark of target spectrum

Alternatively, this BBU51 specifically for, the mark of this target spectrum and this frequency spectrum are sent to this RRU52 by digital baseband I/Q data passage switching time.

Frame head

Frequency spectrum switching time

The mark of target spectrum

By adopting executive agent to be the scheme of terminal, because the interface between BBU and RRU of base station and BBU and RRU of terminal is the interface of physical layer, like this, the transmission of frequency spectrum handover information does not need through high level to the transmission of bottom (namely application layer is to physical layer), thus avoid the delay of this frequency spectrum handover information transmission caused due to high level to the transmission of bottom, ensure that base station and terminal can carry out the synchronism switching of frequency spectrum in time, avoid the interruption of customer service, improve Consumer's Experience.

Affiliated those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the base station of foregoing description and description, with reference to the corresponding process in the embodiment of the method shown in earlier figures 2, can not repeat them here.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.

Claims

1., based on the method that the frequency spectrum of cognitive radio switches, it is characterized in that, comprising:

2. method according to claim 1, is characterized in that, describedly the radio frequency remote unit RRU that described frequency spectrum handover information is sent to described base station by CPRI interface is comprised by Base Band Unit BBU:

3. method according to claim 1 and 2, is characterized in that, is describedly comprised by the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface by BBU:

4. method according to claim 1 and 2, is characterized in that, is describedly comprised by the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface by BBU:

5. method according to claim 1 and 2, is characterized in that, is describedly comprised by the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface by BBU:

6. method according to claim 1 and 2, is characterized in that, is describedly comprised by the RRU that described frequency spectrum handover information is sent to described base station by CPRI interface by BBU:

7., based on the method that the frequency spectrum of cognitive radio switches, it is characterized in that, comprising:

8. method according to claim 7, is characterized in that, describedly by described BBU, the mark of described target spectrum and described frequency spectrum is sent to RRU by described CPRI interface switching time and comprises:

9. method according to claim 7, is characterized in that, describedly by described BBU, the mark of described target spectrum and described frequency spectrum is sent to RRU by described CPRI interface switching time and comprises:

10. method according to claim 7, is characterized in that, the RRU that the mark of described frequency spectrum switching time and described target spectrum is sent to described terminal is comprised by described CPRI interface by the BBU of described terminal:

11. methods according to claim 7, is characterized in that, the RRU that the mark of described frequency spectrum switching time and described target spectrum is sent to described terminal is comprised by described CPRI interface by the BBU of described terminal:

12. 1 kinds of base stations, is characterized in that, comprising: Base Band Unit BBU and radio frequency remote unit RRU;

13. base stations according to claim 12, is characterized in that, described BBU specifically for, described frequency spectrum handover information is encapsulated as radio frames, and by described CPRI interface, described radio frames is sent to described RRU.

14. base stations according to claim 12 or 13, is characterized in that, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by the reservation control word in CPRI superframe.

15. base stations according to claim 12 or 13, is characterized in that, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by ethernet link.

16. base stations according to claim 12 or 13, is characterized in that, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by High-Level Data Link Control HDLC passage.

17. base stations according to claim 12 or 13, is characterized in that, described BBU specifically for, described frequency spectrum handover information is sent to described RRU by digital baseband I/Q data passage.

18. 1 kinds of terminals, is characterized in that, comprising: Base Band Unit BBU and radio frequency remote unit RRU;

19. terminals according to claim 18, is characterized in that, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by the reservation control word in CPRI superframe switching time.

20. terminals according to claim 18, is characterized in that, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by ethernet link switching time.

21. terminals according to claim 18, is characterized in that, described BBU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by High-Level Data Link Control HDLC passage switching time.

22. terminals according to claim 18, is characterized in that, described RRU specifically for, the mark of described target spectrum and described frequency spectrum are sent to described RRU by digital baseband I/Q data passage switching time.