CN104242975A - Communication terminal and method for reducing interference of communication terminal - Google Patents
Communication terminal and method for reducing interference of communication terminal Download PDFInfo
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- CN104242975A CN104242975A CN201310230848.9A CN201310230848A CN104242975A CN 104242975 A CN104242975 A CN 104242975A CN 201310230848 A CN201310230848 A CN 201310230848A CN 104242975 A CN104242975 A CN 104242975A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The invention discloses a communication terminal and a method for reducing the interference of the communication terminal. A first filtration module is arranged between a first antenna switch of the communication terminal and a first antenna of the communication terminal, the first filtration module can filter sending signals from the first antenna switch, and therefore spurious signals output by the first antenna switch can be filtered out. The spurious signals comprise a second harmonic signal, a third harmonic signal, a broadband white noise signal and the like. Thus, the interference on the receiving of a first working unit of the communication terminal from the spurious signals generated by a second working unit of the communication terminal in the communication process can be reduced.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of method of communication terminal and the interference of reduction communication terminal.
Background technology
VCC(Voice Call Continuity) refer to that how to keep the continuity of speech business, the VoIP speech business being about to be carried on source network takes over seamlessly objective network CS territory when UE moves between the network supporting VoIP business, otherwise still.Receive the quantity of different wireless signal according to terminal simultaneously, VCC can be divided into Double RF (Dual Radio, DR) and injection (Single Radio, SR) two kinds of patterns frequently.Double RF (DR) pattern is in the process of VCC switching, and UE can receive at source network and objective network simultaneously and send data; Support that the terminal of this pattern becomes bilateral terminal.Injection frequently (SR) pattern is hypothesis UE can only receive carrier frequency wireless signal at a time point.
For the bilateral terminal supporting Double RF (DR) pattern, in the process switched at VCC, because terminal can receive at source network and objective network and send data simultaneously; The signal that therefore can there is a radio-frequency module transmitting can be received by another module by eating dishes without rice or wine, thus causes interference to the reception of another module.Below for GSM multimode bilateral terminal, the problems referred to above are described.
Shown in Figure 1, this figure is depicted as the architecture block diagram of existing GSM multimode bilateral terminal, and it comprises:
A set of Power Management Unit (PMU), powers to usim card or SIM card, supplies the devices such as digital baseband chip, rf chip, radio-frequency (RF) switch, memory simultaneously and powers;
A set of digital baseband chip (DBB), for the treatment of LTE, GSM isotype transmitting-receiving i/q signal, digital baseband chip can realize LTE, GSM isotype transmitting path, receiving path controls, and processes while digital baseband chip can realize LTE and GSM i/q signal; Digital baseband chip inside is containing clock processing unit, I/Q data processing unit, radio frequency control and management unit, SIM card processing unit, SOC unit;
Two cover Transmit Receive Unit, a set of is at least support the reception of LTE radio signal and launch the Transmit Receive Unit of LTE, the GSM Transmit Receive Unit of another set of reception and transmitting for supporting GSM radiofrequency signal.The transceiver module that LTE radio transceiver module at least comprises reception and the transmitting supporting LTE radio signal is (inner containing clock Buffer, PLL etc.), the power amplifier module carrying out each frequency band signals amplification is some, the bandpass filtering modules block of carrying out filtering band stray after being placed in power amplifier module is some, be placed in rf chip receiving terminal to carry out filtering to receive the sound table filtration module of band stray some, the diplexing components carrying out frequency division multiplexing is some, duplexer two overlaps, and (a set of frequency range for path one switches, the another set of frequency range for path two switches), (a set of transmitting and receiving of the signal for path one that radio-frequency antenna two overlaps, the another set of transmitting and receiving of the signal for path two) etc.
GSM Transmit Receive Unit comprises the radio-frequency (RF) receiving and transmission module (inner containing clock Buffer, PLL etc.) of reception and the transmitting at least supporting GSM radiofrequency signal, the GSM radio-frequency front-end be connected with this radio-frequency (RF) receiving and transmission module path; Shown in Figure 2, GSM radio-frequency front-end comprise carry out each frequency band signals amplification one, power amplifier, be placed in power amplifier PA after carry out filtering band stray high power filter 2, be placed in radio-frequency (RF) receiving and transmission module receiving terminal and carry out a set of (a set of signal transmitting and receiving etc. for path one and path two of 2, filter, duplexer a set of (the transmitting-receiving path for path one and path two switches) in band that filtering receives band stray, radio-frequency antenna (ANT3).
Suppose that the transceiving chip of GSM radio-frequency (RF) receiving and transmission module at least can support reception and the transmitting of the signal of GSM900 and DCS1800 frequency range, built-in ADC and for the collection of analog signal and the output of analog signal; And above-mentioned path one is GSM900 frequency range, is DCS1800 frequency range above by two.GSM900 transmit primarily of the useful signal of GSM900, each harmonic signal transmitted, transmit wideband white noise composition.Wherein the useful signal launched of GSM900 is large due to amplitude, can be considered LTE(TD-SCDMA) receive the band external blocking signal of frequency range.As shown in Figure 3,2 subharmonic (1790MHz-1820MHz) transmitted of GSM900 drop on beyond the outer 60MHz of reception frequency range (1880MHz-1920MHz) band of Band39; 3 subharmonic (2685MHz-2730MHz) can drop on Band38(2570-2620) receive outside frequency range band; But the triple-frequency harmonics of GSM900 (2685MHz-2730MHz) has dropped on and has received in frequency range band at Band7/41, and can disturb Band7/41 high band receptivity, concrete computational process is as follows:
Band7: reception frequency range be 2620MHz-2690MHz, its frequency range of 1/3 correspondence receiving frequency range is 873.33MHz-896.67MHz.
Channel and the frequency corresponding relation of EGSM are
880.2MHz (975 channel)
889.8MHz (1023 channel)
890.2MHz (1 channel)
896.6MHz (33 channel)
896.8MHz (34 channel)
Therefore, each 3 subharmonic frequencies launching channel are respectively
880.2MHz (975 channel) * 3=2640.6MHz
895MHz (25 channel) * 3=2685MHz
889.8MHz (1023 channel) * 3=2669.4MHz
890.2MHz (1 channel) * 3=2670.6MHz
896.6MHz (33 channel) * 3=2689.8MHz
896.8MHz (34 channel) * 3=2690.4MHz
910MHz (100 channel) * 3=2730MHz
914.8MHz (124 channel) * 3=2744.4MHz
So when EGSM900 launches at channel 975 to channel 1023 and channel 1 to channel 34, its 3 subharmonic can cause interference to Band7 and Band41 high band receive channel.In order to solve this problem, existing scheme way is that use between output power amplifier and duplexer can resistance to powerful bandpass filtering, 3 subharmonic exported with filtering power amplifier, as shown in Figure 4.But the scheme shown in Fig. 4 can not solve the harmonic characterisitic that duplexer causes, 3 subharmonic characteristics of common duplexer are less than-70dBc, if the transmitting of the GSM900 of 35dBm, the signal being less than-35dBm can be produced at 3 subharmonic places of duplexer, these spurious signals still can pass through GSM antenna transmission, be coupled to Band7/41 receiving port by eating dishes without rice or wine, co-channel interference is caused to its reception.
Summary of the invention
The main technical problem to be solved in the present invention is, provides a kind of method of communication terminal and the interference of reduction communication terminal, and the spurious signal that reduction existing communication terminal produces in communication process receives the interference caused to communication terminal LTE.
In order to solve the problem, the invention provides a kind of communication terminal, comprise Base Band Unit, the first working cell be connected with described Base Band Unit respectively and the second working cell; Described first working cell is LTE working cell; Described second working cell is GSM working cell, WCDMA working cell or CDMA working cell;
Described second working cell comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Described signal transmitting and receiving module comprises the first frequency band signals and sends submodule, described signal transmitting and receiving module is used for sending submodule by described first frequency band signals and signal to be sent is sent to described first day wiretap, and sends to described first filtration module by described first day wiretap; Described first filtration module is used for carrying out it after filtering process by described first antenna outgoing described signal to be sent.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the first frequency band signals and receives submodule, and described signal transmitting and receiving module also receives successively by signal that described first antenna and described first day wiretap send over for receiving submodule by described first frequency band signals.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer and the second antenna, described signal transmitting and receiving module also sends submodule by signal to be sent through described second duplexer for passing through described second frequency band signals, and by described second antenna outgoing.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and receives submodule, and described signal transmitting and receiving module also receives successively by signal that described second antenna and described second duplexer send over for receiving submodule by described second frequency band signals.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer, signal to be sent is also sent to described second duplexer for sending submodule by described second frequency band signals by described signal transmitting and receiving module, and sends to described first filtration module by described second duplexer; Described first filtration module is multichannel filtering module, for carrying out it described signal to be sent after filtering process by described first antenna outgoing.
In an embodiment of the present invention, described second working cell also comprises signal amplification module, and described signal amplification module is sent to described first day wiretap after being used for that the signal described to be sent sending submodule from described first frequency band signals is carried out amplification process.
In an embodiment of the present invention, described Base Band Unit comprises interference detection module, also comprises the first working cell control module and the second working cell control module that are respectively used to control described first working cell and described second working cell work; Described interference detection module is for obtaining the control information of described first working cell control module and described second working cell control module, and the control information according to obtaining judges whether there is interference between described first working cell and described second working cell.
In an embodiment of the present invention, described second working cell also comprises the second filtration module be connected between described first frequency band signals transmission submodule and described first day wiretap; Described second filtration module sends to described first day wiretap after being used for that the signal described to be sent sending submodule from described first frequency band signals is carried out filtering process.
In an embodiment of the present invention, described first filtration module and described second filtration module are harmonic filter circuit module.
In order to solve the problem, present invention also offers a kind of method reducing communication terminal interference, described communication terminal comprises Base Band Unit, the first working cell be connected with described Base Band Unit respectively and the second working cell; Described first working cell is LTE working cell; Described second working cell is GSM working cell, WCDMA working cell or CDMA working cell;
Described second working cell comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Described signal transmitting and receiving module comprises the first frequency band signals and sends submodule, described signal transmitting and receiving module sends submodule by described first frequency band signals and signal to be sent is sent to described first day wiretap, and sends to described first filtration module by described first day wiretap;
Described first filtration module to carry out it after filtering process by described first antenna outgoing described signal to be sent.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the first frequency band signals and receives submodule, and described signal transmitting and receiving module receives submodule by described first frequency band signals and receives successively by signal that described first antenna and described first day wiretap send over.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer and the second antenna, described signal transmitting and receiving module sends submodule by signal to be sent through described second duplexer by described second frequency band signals, and by described second antenna outgoing.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and receives submodule, and described signal transmitting and receiving module receives submodule by described second frequency band signals and receives successively by signal that described second antenna and described second duplexer send over.
In an embodiment of the present invention, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer, described signal transmitting and receiving module sends submodule by described second frequency band signals and signal to be sent is sent to described second duplexer, and sends to described first filtration module by described second duplexer; Described first filtration module to carry out it after filtering process by described first antenna outgoing described signal to be sent; Described first filtration module is multichannel filtering module.
In an embodiment of the present invention, described second working cell also comprises signal amplification module, and described signal amplification module is sent to described first day wiretap after the signal described to be sent sending submodule from described first frequency band signals is carried out amplification process.
In an embodiment of the present invention, described second working cell also comprises the second filtration module be connected between described first frequency band signals transmission submodule and described first day wiretap; Described second filtration module sends to described first day wiretap after the signal described to be sent sending submodule from described first frequency band signals is carried out filtering process.
In an embodiment of the present invention, described Base Band Unit comprises interference detection module, also comprises the first working cell control module and the second working cell control module that control described first working cell and described second working cell work respectively;
Described interference detection module obtains the control information of described first working cell control module and described second working cell control module, and the control information according to obtaining judges whether there is interference between described first working cell and described second working cell.
In an embodiment of the present invention, described control information comprises working frequency range information, working channel information and transmission power information; According to the control information obtained, described interference detection module judges that whether there is interference between described first working cell and described second working cell comprises:
According to described working frequency range information, described interference detection module judges whether the working frequency range of described first working cell and described second working cell exists interference;
As existed, according to described working channel information, described interference detection module judges whether the working channel of described first working cell and described second working cell exists interference further;
As existed, described interference detection module judges whether there is interference between described first working cell and described second working cell according to described transmission power information further.
In an embodiment of the present invention, described working channel information comprises the center frequency point of the transmitting channel of the second working cell, the second working cell transmits the bandwidth taken, and the center frequency point of the first working cell receive channel, the first working cell receive channel bandwidth sum first working cell receptivity protect bandwidth without degrade signal; Described transmission power information comprises the emitting power grade of the first working cell, also comprises interference power grade;
According to described working channel information, described interference detection module judges whether the working channel of described first working cell and described second working cell exists interference and comprise further:
Interference detection module judges whether the transmitting channel of described second working cell and the receive channel of described first working cell exist interference; As existed, the MHz that judges whether 3* (F02-BW0/2, F02+BW0/2) MHz is contained in (F01-BW1/2-Δ BW, F01+BW1/2+ Δ BW); Wherein, described F02 is the center frequency point that channel is launched in the second working cell, BW0 is the occupied bandwidth that the second working cell transmits, F01 is the center frequency point of the first working cell receive channel, BW1 is the bandwidth of the first working cell receive channel, and Δ BW is that the first working cell receptivity protects bandwidth without degraded channel; As judged to comprise, described interference detection module judges whether there is interference between described first working cell and described second working cell according to described transmission power information further, comprising:
Judge whether the power grade that the second working cell is launched is greater than interference power grade, as no, is judged to be to there is not interference; Otherwise, be judged to be to there is interference.
The invention has the beneficial effects as follows:
Communication terminal provided by the invention comprises Base Band Unit, the first working cell be connected with Base Band Unit respectively and the second working cell; First working cell is LTE working cell; Second working cell can be GSM working cell, WCDMA working cell or CDMA working cell; First working cell is used in the second working cell and sends while data to objective network, receives data from source network; Second working cell comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Signal transmitting and receiving module comprises the first frequency band signals and sends submodule, and by this first frequency band signals transmission submodule, signal to be sent is sent to first day wiretap, then send to described first filtration module by first day wiretap, the first filtration module carries out after filtering process by a GSM antenna outgoing this signal to be sent.Visible, communication terminal provided by the invention, the first filtration module is also provided with between first day wiretap and the first antenna, this first filtration module can enter filtering process to the signal to be sent from first day wiretap, spurious signal (the comprising 3 subharmonic) filtering that therefore first day wiretap can be exported, and then the interference that can reduce that the reception of spurious signal to terminal first working cell that terminal second working cell produces in communication process cause.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of communication terminal;
Fig. 2 is the structural representation of GSM radio-frequency front-end in Fig. 1;
Fig. 3 is the schematic diagram of GSM900 frequency range to other band interference situations;
Figure 4 shows that the structural representation of another kind of GSM radio-frequency front-end;
The structural representation one of the communication terminal that Fig. 5 provides for the embodiment of the present invention one;
The structural representation two of the communication terminal that Fig. 6 provides for the embodiment of the present invention one;
The structural representation three of the communication terminal that Fig. 7 provides for the embodiment of the present invention one;
Fig. 8 is the structural representation one of the first filtering mould in Fig. 6;
Fig. 9 is the structural representation two of the first filtering mould in Fig. 6;
Figure 10 is the structural representation three of the first filtering mould in Fig. 6;
Figure 11 is the structural representation four of the first filtering mould in Fig. 6;
The structural representation four of the communication terminal that Figure 12 provides for the embodiment of the present invention one;
The structural representation five of the communication terminal that Figure 13 provides for the embodiment of the present invention one;
The Base Band Unit structural representation that Figure 14 provides for the embodiment of the present invention one;
The schematic flow sheet judging whether to exist between the first working cell and the second working cell interference that Figure 15 provides for the embodiment of the present invention one;
The communication terminal structural representation that Figure 16 provides for the embodiment of the present invention two;
Figure 17 is the structural representation one of GSM radio-frequency front-end in Figure 16;
Figure 18 is the structural representation two of GSM radio-frequency front-end in Figure 16;
The schematic flow sheet judging whether to exist between LTE working cell and GSM working cell interference that Figure 19 provides for the embodiment of the present invention two.
Embodiment
The present invention by arranging the first filtration module between the first day wiretap and the first antenna of communication terminal, this first filtration module can enter filtering process to the transmission signal from first day wiretap, the spurious signal filtering that therefore first day wiretap can be exported, spurious signal comprises the signals such as 2 rd harmonic signal, 3 rd harmonic signal, wideband white noise; The interference that the reception of the spurious signal that second working cell that therefore can reduce communication terminal produces in communication process to the first working cell of communication terminal causes.
For a better understanding of the present invention, below in conjunction with specific embodiment, the present invention is described further:
Embodiment one:
The structural representation of the communication terminal that the present embodiment provides is shown in Figure 5, and this communication terminal comprises: Base Band Unit, the first working cell be connected with Base Band Unit respectively and the second working cell; Wherein the first working cell is LTE working cell; Second working cell can be GSM working cell, WCDMA working cell or CDMA working cell according to the difference of working form; The first working cell in the present embodiment is used in the second working cell and sends while data to objective network, receives data from source network.Namely the communication terminal in the present invention can be the bilateral terminal supporting Double RF (DR) pattern.
Shown in Figure 6, in the present embodiment, the second working cell of communication terminal comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Signal transmitting and receiving module comprises the first frequency band signals and sends submodule (not shown), and the first radiofrequency signal transmission submodule, first day wiretap, the first filtration module are connected successively with the first antenna; Signal transmitting and receiving module is used for sending submodule by the first frequency band signals and signal to be sent is sent to first day wiretap, and this signal to be sent is then sent to the first filtration module by first day wiretap; First filtration module to carry out it after filtering process by the first antenna outgoing this signal to be sent.
Visible, second working cell of the present embodiment communication terminal is when objective network sends data, be arranged at first day wiretap and the signal to be sent from first day wiretap can be entered filtering process by the first antenna first filtration module, with the spurious signal exported by first day wiretap (comprising each harmonic, wideband white noise signal etc.) filtering, these spurious signals are avoided to be launched by the first antenna; Therefore, in the second working cell to objective network send data time, when receiving data to the first working cell from source network, the interference that produces reduces greatly.
In the present embodiment, the first filtration module can select concrete implementation according to concrete application scenarios, and such as, the first filtration module can be filter shown in 7, the filter shown in Fig. 8 on path L, C in parallel to form; First filtration module can be also filter shown in 8, the filter shown in Fig. 9 on path, use band pass filter and L, C in parallel to form; First filtration module can be also filter shown in 9, the filter shown in Fig. 9 on path, use low pass filter and L, C in parallel to form; First filtration module can also be filter shown in 10, the filter shown in Figure 11 on path, use L//C and L, C in parallel to form.
In the present embodiment, signal transmitting and receiving module also comprises the first frequency band signals reception submodule (not shown); Shown in Figure 6, signal transmitting and receiving module receives submodule by the first frequency band signals and receives successively by signal that the first antenna and first day wiretap send over.
Communication terminal in the present embodiment can be multi-mode communication terminal, shown in Figure 6, signal transmitting and receiving module in the present embodiment also comprises the second frequency band signals and sends submodule (not shown), second working cell also comprises the second duplexer and the second antenna, signal transmitting and receiving module also sends submodule by the second frequency band signals and signal to be sent is sent to the second duplexer, and this signal to be sent is sent by the second antenna by the second duplexer.
Signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, shown in Figure 6, and signal transmitting and receiving module is also received successively by signal that the second antenna and the second duplexer send over for being received submodule by the second frequency band signals.
Certainly, during the non-multi-mode communication terminal of the communication terminal in the present embodiment, second working cell also can only include an antenna, shown in Figure 7, the difference of Fig. 7 and Fig. 6 is, signal transmitting and receiving module comprise second frequency band signals send submodule time (not shown), the second working cell comprises the second duplexer; But can not comprise the second antenna, signal transmitting and receiving module then sends submodule by the second frequency band signals and signal to be sent is sent to the second duplexer, and sends to the first filtration module by the second duplexer; First filtration module to carry out it after filtering process by the first antenna outgoing this signal to be sent.Such as, but the first filtration module is now multichannel filtering module, Diplexer, multichannel filtering module can realize the problem that multiple frequency range shares an antenna.Such as, multichannel filtering module can be set there are two filtering operation paths, a closed-circuit working is in low-frequency range, as 700MHz-960MHz, in low frequency length of tape, have less differential loss, a closed-circuit working is at high band, as 1700MHz-2690MHz, in high frequency length of tape, there is less differential loss, between two paths, be provided with suitable isolation, above-mentioned two frequency ranges can be realized and share an antenna.
Shown in Figure 12, the second working cell in the present embodiment also comprises the signal amplification module be arranged between the first frequency band signals transmission submodule and first day wiretap; The signal to be sent that signal amplification module is used for the first frequency band signals to send submodule transmission carries out being sent to first day wiretap after amplification processes.Equally, the second duplexer is sent to after the signal to be sent that signal amplification module also sends for the second frequency band signals being sent submodule carries out amplification process.
In communication terminal shown in Figure 12, after signal amplification module carries out filtering process to transmission signal, its signal exported comprises spurious signal, after first day wiretap processes the transmission signal that signal amplification module sends, first day wiretap self also can produce output factors signal, therefore the first filtration module between first day wiretap with the first antenna need carry out filtering process to superposing of the spurious signal that signal amplification module and first day wiretap produce, therefore it has larger in-band insertion loss at 3 subharmonic places, reception frequency range and transmit frequency band can be caused to have larger Insertion Loss, impact receives the receiving feature of frequency range.
Shown in Figure 13, in order to solve the problem, on the basis shown in Figure 12, send between submodule and first day wiretap at the first frequency band signals and being also provided with the second filtration module; Second filtration module sends to first day wiretap after being used for that the signal to be sent sent from signal amplification module is carried out filtering process again.Second filtration module amplifies the transmission signal after processing to signal amplification module and carries out filtering process, the spurious signal that signal amplification module exports can be filtered, the superposition of the spurious signal produced for signal amplification module and first day wiretap to avoid the spurious signal exported at first day wiretap place, and then reduce the in-band insertion loss of the first filtration module at 3 subharmonic places, thus reduce the impact on the receiving feature receiving frequency range.It should be noted that the first filtration module in the present embodiment and the second filtration module all can be harmonic filter circuit module.
Certainly, also directly can send between submodule at the first frequency band signals of the first day wiretap shown in Fig. 6 and signal transmitting and receiving module and the second filtration module is directly set, to reduce the in-band insertion loss of the first filtration module at 3 subharmonic places, thus reduce the impact on the receiving feature receiving frequency range.
In the present embodiment, except the first filtration module shown in Figure 13 and the second filtration module, also can receive between submodule at first day wiretap and the first frequency band signals and the 3rd filtration module is set, 3rd filtration module specifically can adopt band pass filter, for the out of band signal filtering will comprised in the signal received; Equally, receive between submodule at the second duplexer and the second frequency band signals and also can arrange the 4th filtration module, the 4th filtration module specifically also can adopt band pass filter, for the out of band signal filtering will comprised in the signal received; Between second switch and signal amplification module, also can arrange the 5th filtration module, the 5th filtration module can make band pass filter and/or low pass filter etc., and the spurious signal that the transmission signal for being exported by signal amplification module comprises carries out filtration treatment.
Shown in Figure 14, the Base Band Unit in the present embodiment comprises interference detection module, is respectively used to the first working cell control module and the second working cell control module of control first working cell and the work of the second working cell; Interference detection module obtains the control information of the first working cell control module and the second working cell control module, and the control information according to obtaining judges whether there is interference between the first working cell and the second working cell.Control information herein refers to that the first working cell control module and the second working cell control module control the relevant information that work is carried out in the first working cell and the second working cell respectively, can comprise the working frequency range information of the first working cell and the second working cell, working channel information, transmission power information (comprising emitting power grade information and interference power class information etc.); According to the control information obtained, interference detection module is judged that whether there is interference between the first working cell and the second working cell is specifically described below:
In the present embodiment, the control information of the first control module relevant controlling first working cell, working cell is reported to interference detection module; The control information of relevant controlling second working cell is also reported to interference detection module by the second working cell control module; Concrete, working channel information in the present embodiment can comprise that the center frequency point of channel is launched in the second working cell, the second working cell transmits the bandwidth taken, and first working cell receive channel center frequency point and the bandwidth of the first working cell receive channel, and the first working cell receptivity protects bandwidth without degrade signal; Transmission power information in embodiment comprises the emitting power grade information of the first working cell, also comprises interference power class information etc.Shown in Figure 15, according to the above-mentioned control information obtained, interference detection module judges that whether there is interference between the first working cell and the second working cell comprises:
Step 1401: according to the working frequency range of the working frequency range of the first working cell and the second working cell, interference detection module judges whether the working frequency range of the first working cell and the second working cell exists interference; Judge whether that the criterion that there is interference can be selected to arrange according to concrete application scenarios according to working frequency range, whether such as, the standard such as superposition, the two close degree can be had to judge according to the two, the present embodiment no longer repeats it; As there is interference, go to step 1402: otherwise, go to step 1405
Step 1402: according to working channel information, interference detection module judges whether the working channel of described first working cell and described second working cell exists interference further; Be specially interference detection module and judge whether the transmitting channel of the second working cell and the receive channel of the first working cell exist interference further; The concrete calculating and the determination methods that whether there is interference between channel can adopt the scheme shown in Fig. 3, do not repeat them here; As judged to there is interference, go to step 1403; Otherwise, go to step 1405
Step 1403: judge 3* (F0
2-BW0/2, F0
2+ BW0/2) whether MHz be contained in (F0
1-BW1/2-Δ BW, F0
1+ BW1/2+ Δ BW) MHz; Wherein, F0
2be the center frequency point that channel is launched in the second working cell, BW0 is the occupied bandwidth that the second working cell transmits, F0
1be the center frequency point of the first working cell receive channel, BW1 is the bandwidth of the first working cell receive channel, and Δ BW is that the first working cell receptivity protects bandwidth without degraded channel; As judged not comprise, going to step 1405 as comprised, going to step 1404;
Step 1404; Judge whether the power grade PCL that the second working cell is launched is greater than interference power grade PCL, if be not more than, goes to step 1405; As being greater than, go to step 1406;
Step 1405; Do not carry out the first job network gravity treatment and/or do not carry out the second job network gravity treatment.
Step 1406; Carry out the first job network gravity treatment and/or carry out the second job network gravity treatment.
Visible, the present embodiment also goes out between the first working cell and the second working cell whether there is interference by above-mentioned testing process fast detecting, adjusts with the timely common group network to the two, ensures normally carrying out of communication.
Embodiment two:
According to the difference of network formats, the second working cell in the present embodiment can be GSM working cell, WCDMA working cell or CDMA working cell; In order to understand the present invention better, be that the present invention is described further for example for the multimode bilateral terminal of GSM standard with communication terminal in the present embodiment; Shown in Figure 16, this figure is depicted as the structural representation of the communication terminal that the present embodiment provides.Compared with communication terminal shown in its with Fig. 1, difference is that the structure of GSM radio-frequency front-end is different, and GSM working cell comprises two cover GSM antennas, specifically refers to shown in Figure 17 and Figure 18.
According to Figure 17, the communication terminal that the present embodiment provides, the GSM radio-frequency front-end of its GSM working cell comprises GSM signal amplification module, two cover duplexers, be respectively a GSM duplexer and the 2nd GSM duplexer, also comprise two corresponding cover the one GSM antenna (ANT3) and the 2nd GSM antennas (ANT4), be connected with the first filtration module between one GSM duplexer and a GSM antenna, the first frequency band signals of a GSM duplexer and GSM signal transmitting and receiving module receives between submodule and is connected with the 3rd filtration module; First frequency band signals of the one GSM duplexer and GSM signal transmitting and receiving module sends between submodule and is connected with GSM signal amplifier;
2nd GSM duplexer is directly connected with the 2nd GSM antenna, and the second frequency band signals of GSM duplexer and GSM signal transmitting and receiving module receive between submodule and be connected with the 4th filtration module; Second frequency band signals of the 2nd GSM duplexer and GSM signal transmitting and receiving module sends between submodule and is connected with GSM signal amplifier.
Shown in Figure 18, the difference of Figure 18 and Figure 17 is, between a GSM duplexer and GSM signal amplifier, be also provided with the second filtration module.
In Figure 17 and Figure 18, the concrete set-up mode and acting in embodiment one of each filtration module is described in detail, does not repeat them here.
Send submodule and the first frequency band signals for the first frequency band signals below to receive submodule and be respectively GSM900 signal and send submodule and GSM900 Signal reception submodule, the second frequency band signals and send submodule and the second frequency band signals and receive submodule and be respectively DCS1800 signal and send submodule and DCS1800 Signal reception submodule the present invention will be further described; Should be understood that, when network formats is different, also can there is this interference problem in the frequency range of correspondence, such as, also can there is this interference problem in WCDMA900 and CDMA900 frequency range in this reality.
Under above-mentioned application scenarios, shown in Figure 3, there is co-channel interference to the receive channel of LTE working cell in Band7 and Band41 frequency range in the transmitting channel of GSM working cell.Below, with the scheme shown in Figure 17 and Figure 18, the principle solved the problem is described respectively.
Refer to Figure 17, in scheme shown in this figure, GSM900 signal sends after transmission signal is amplified by GSM signal amplification module by submodule and exports a GSM duplexer to, then the first filtration module is exported to through a GSM duplexer, after first filtration module carries out filtering process to the spurious signal (comprising 3 rd harmonic signal) in this transmission signal, through a GSM antenna outgoing.Spurious signal herein comprises the spurious signal of GSM signal amplification module generation and the spurious signal of GSM duplexer generation; Therefore there is larger in-band insertion loss at 3 subharmonic places in a GSM duplexer herein.
In order to solve the problem, refer to Figure 18, Figure 18 adds the second filtration module on the basis of Figure 17, and its course of work is as follows:
GSM900 signal sends after transmission signal is amplified by GSM signal amplification module by submodule and exports the second filtration module to, the spurious signal (comprising 3 rd harmonic signal) that second filtration module comprises this signal carries out filtering process, namely filtering process is carried out to the spurious signal that GSM signal amplification module exports, then filtered transmission signal is sent to a GSM duplexer, then the first filtration module is exported to through a GSM duplexer, after first filtration module carries out filtering process to the spurious signal (comprising 3 rd harmonic signal) in this transmission signal, through a GSM antenna outgoing, now the spurious signal of the first filtration module process then mainly the one GSM duplexer produce spurious signal, therefore a GSM duplexer now in the relative Figure 17 of in-band insertion loss at 3 subharmonic places the first filtration module to reduce a lot.
Corresponding, interference detection module obtains corresponding control message by GSM working cell control module and LTE working cell control module, and the process whether its GSM working cell judged and LTE working cell exist interference is shown in Figure 19, and it comprises:
Step 1801: according to the working frequency range of the working frequency range of LTE working cell and GSM working cell, interference detection module judges whether the working frequency range of LTE working cell and GSM working cell exists interference; Judge whether that the criterion that there is interference can be selected to arrange according to concrete application scenarios according to working frequency range, whether such as, the standard such as superposition, the two close degree can be had to judge according to the two, the present embodiment no longer repeats it; As there is interference, go to step 1802: otherwise, go to step 1805
Step 1802: according to working channel information, interference detection module judges whether the working channel that described LTE does unit and described GSM working cell exists interference further; In this way, described interference detection module judges whether the transmitting channel of GSM working cell and the receive channel of LTE working cell exist interference further; The concrete calculating and the determination methods that whether there is interference between channel can adopt the scheme shown in Fig. 3, do not repeat them here; As judged to there is interference, go to step 1803; Otherwise, go to step 1805
Step 1803: judge 3* (F0
gsm-BW0/2, F0
gsm+ BW0/2) whether MHz be contained in (F0
lte-BW1/2-Δ BW, F0
lte+ BW1/2+ Δ BW) MHz; Wherein, F0
gsmfor the center frequency point of channel is launched in GSM working cell, BW0 is the occupied bandwidth that GSM working cell transmits, F0
ltefor the center frequency point of LTE working cell receive channel, BW1 is the bandwidth of LTE working cell receive channel, and Δ BW is that LTE working cell receptivity protects bandwidth without degraded channel; As judged not comprise, going to step 1805 as comprised, going to step 1804;
Step 1804; Judge GSM do unit launch power grade PCL whether be greater than interference power grade PCL, if be not more than, go to step 1805; As being greater than, go to step 1806;
Step 1805; Do not carry out GSM network gravity treatment and/or do not carry out LTE network gravity treatment.
Step 1806; Carry out GSM network gravity treatment and/or carry out LTE network gravity treatment.
Visible, second working cell of communication terminal of the present invention is when objective network sends data, be arranged at first day wiretap and the signal to be sent from first day wiretap can be entered filtering process by the first antenna first filtration module, with the spurious signal exported by first day wiretap (comprising each harmonic, wideband white noise signal etc.) filtering, these spurious signals are avoided to be launched by the first antenna; Therefore, in the second working cell to objective network send data time, when receiving data to the first working cell from source network, the interference that produces reduces greatly.
Meanwhile, the present invention also goes out between the first working cell and the second working cell whether there is interference by above-mentioned testing process fast detecting, adjusts with the timely common group network to the two, ensures normally carrying out of communication.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (12)
1. a communication terminal, is characterized in that, comprises Base Band Unit, the first working cell be connected with described Base Band Unit respectively and the second working cell; Described first working cell is LTE working cell; Described second working cell is GSM working cell, WCDMA working cell or CDMA working cell;
Described second working cell comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Described signal transmitting and receiving module comprises the first frequency band signals and sends submodule, described signal transmitting and receiving module is used for sending submodule by described first frequency band signals and signal to be sent is sent to described first day wiretap, and sends to described first filtration module by described first day wiretap; Described first filtration module is used for carrying out it after filtering process by described first antenna outgoing described signal to be sent.
2. communication terminal as claimed in claim 1, it is characterized in that, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer and the second antenna, described signal transmitting and receiving module also sends submodule by signal to be sent through described second duplexer for passing through described second frequency band signals, and by described second antenna outgoing.
3. communication terminal as claimed in claim 1, it is characterized in that, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer, signal to be sent is also sent to described second duplexer for sending submodule by described second frequency band signals by described signal transmitting and receiving module, and sends to described first filtration module by described second duplexer; Described first filtration module is multichannel filtering module, for carrying out it described signal to be sent after filtering process by described first antenna outgoing.
4. the communication terminal as described in any one of claim 1-3, it is characterized in that, described Base Band Unit comprises interference detection module, also comprises the first working cell control module and the second working cell control module that are respectively used to control described first working cell and described second working cell work; Described interference detection module is for obtaining the control information of described first working cell control module and described second working cell control module, and the control information according to obtaining judges whether there is interference between described first working cell and described second working cell.
5. the communication terminal as described in any one of claim 1-3, is characterized in that, described second working cell also comprises the second filtration module be connected between described first frequency band signals transmission submodule and described first day wiretap; Described second filtration module sends to described first day wiretap after being used for that the signal described to be sent sending submodule from described first frequency band signals is carried out filtering process.
6. reduce a method for communication terminal interference, it is characterized in that, described communication terminal comprises Base Band Unit, the first working cell be connected with described Base Band Unit respectively and the second working cell; Described first working cell is LTE working cell; Described second working cell is GSM working cell, WCDMA working cell or CDMA working cell;
Described second working cell comprises signal transmitting and receiving module, first day wiretap, the first filtration module and the first antenna; Described signal transmitting and receiving module comprises the first frequency band signals and sends submodule, described signal transmitting and receiving module sends submodule by described first frequency band signals and signal to be sent is sent to described first day wiretap, and sends to described first filtration module by described first day wiretap;
Described first filtration module to carry out it after filtering process by described first antenna outgoing described signal to be sent.
7. the method reducing communication terminal interference as claimed in claim 6, it is characterized in that, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer and the second antenna, described signal transmitting and receiving module sends submodule by signal to be sent through described second duplexer by described second frequency band signals, and by described second antenna outgoing.
8. the method reducing communication terminal interference as claimed in claim 6, it is characterized in that, described signal transmitting and receiving module also comprises the second frequency band signals and sends submodule, described second working cell also comprises the second duplexer, described signal transmitting and receiving module sends submodule by described second frequency band signals and signal to be sent is sent to described second duplexer, and sends to described first filtration module by described second duplexer; Described first filtration module to carry out it after filtering process by described first antenna outgoing described signal to be sent; Described first filtration module is multichannel filtering module.
9. the method for the reduction communication terminal interference as described in any one of claim 6-8, is characterized in that, described second working cell also comprises the second filtration module be connected between described first frequency band signals transmission submodule and described first day wiretap; Described second filtration module sends to described first day wiretap after the signal described to be sent sending submodule from described first frequency band signals is carried out filtering process.
10. the method for the reduction communication terminal interference as described in any one of claim 6-8, it is characterized in that, described Base Band Unit comprises interference detection module, also comprises the first working cell control module and the second working cell control module that control described first working cell and described second working cell work respectively;
Described interference detection module obtains the control information of described first working cell control module and described second working cell control module, and the control information according to obtaining judges whether there is interference between described first working cell and described second working cell.
11. methods reducing communication terminal interference as claimed in claim 10, it is characterized in that, described control information comprises working frequency range information, working channel information and transmission power information; According to the control information obtained, described interference detection module judges that whether there is interference between described first working cell and described second working cell comprises:
According to described working frequency range information, described interference detection module judges whether the working frequency range of described first working cell and described second working cell exists interference;
As existed, according to described working channel information, described interference detection module judges whether the working channel of described first working cell and described second working cell exists interference further;
As existed, described interference detection module judges whether there is interference between described first working cell and described second working cell according to described transmission power information further.
12. methods reducing communication terminal interference as claimed in claim 11, it is characterized in that, described working channel information comprises the center frequency point of the transmitting channel of the second working cell, the second working cell transmits the bandwidth taken, and the center frequency point of the first working cell receive channel, the first working cell receive channel bandwidth sum first working cell receptivity protect bandwidth without degrade signal; Described transmission power information comprises the emitting power grade of the first working cell, also comprises interference power grade;
According to described working channel information, described interference detection module judges whether the working channel of described first working cell and described second working cell exists interference and comprise further:
Interference detection module judges whether the transmitting channel of described second working cell and the receive channel of described first working cell exist interference; As existed, judge 3* (F0
2-BW0/2, F0
2+ BW0/2) whether MHz be contained in (F0
1-BW1/2-Δ BW, F0
1+ BW1/2+ Δ BW) MHz; Wherein, described F0
2be the center frequency point that channel is launched in the second working cell, BW0 is the occupied bandwidth that the second working cell transmits, F0
1be the center frequency point of the first working cell receive channel, BW1 is the bandwidth of the first working cell receive channel, and Δ BW is that the first working cell receptivity protects bandwidth without degraded channel; As judged to comprise, described interference detection module judges whether there is interference between described first working cell and described second working cell according to described transmission power information further, comprising:
Judge whether the power grade that the second working cell is launched is greater than interference power grade, as no, is judged to be to there is not interference; Otherwise, be judged to be to there is interference.
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| CN201310230848.9A CN104242975B (en) | 2013-06-09 | 2013-06-09 | Communication terminal and the method for reducing communication terminal interference |
| PCT/CN2013/082011 WO2013189411A2 (en) | 2013-06-09 | 2013-08-21 | Communication terminal and method for reducing interferences for communication terminal |
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| CN201310230848.9A CN104242975B (en) | 2013-06-09 | 2013-06-09 | Communication terminal and the method for reducing communication terminal interference |
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Also Published As
| Publication number | Publication date |
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| CN104242975B (en) | 2018-04-10 |
| WO2013189411A3 (en) | 2014-05-08 |
| WO2013189411A2 (en) | 2013-12-27 |
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