WO2013189411A2

WO2013189411A2 - Communication terminal and method for reducing interferences for communication terminal

Info

Publication number: WO2013189411A2
Application number: PCT/CN2013/082011
Authority: WO
Inventors: 周正林
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-06-09
Filing date: 2013-08-21
Publication date: 2013-12-27
Also published as: CN104242975B; WO2013189411A3; CN104242975A

Abstract

Disclosed are a communication terminal and a method for reducing interferences for a communication terminal. A first filtering module is disposed between a first antenna switch and a first antenna of the communication terminal, and the first filtering module may perform filtering processing on a sent signal from the first antenna switch, and therefore a stray signal output by the first antenna switch may be filtered, where the stray signal comprises a signal such as a second harmonic signal, a third harmonic signal, and a broadband white noise, so as to reduce interferences on the reception of a first work unit of the communication terminal caused by the stray signal generated by a second work unit of the communication terminal during communication.

Description

Communication terminal and method for reducing interference of communication terminal

The present invention relates to the field of communications, and in particular, to a communication terminal and a method for reducing interference of a communication terminal. Background technique

VCC (Voice Call Continuity) refers to how to maintain the continuity of voice services when the UE moves between networks supporting VoIP services. The VoIP voice service carried on the source network is smoothly switched to the target network CS domain, and vice versa. According to the number of different wireless signals received by the terminal at the same time, the VCC can be divided into two modes: dual radio (DR) and single radio (SR). The dual radio frequency (DR) mode is that during the VCC handover, the UE can receive and transmit data in both the source network and the target network; the terminal supporting the mode becomes a dual-pass terminal. The single radio frequency (SR) mode assumes that the UE can only receive one carrier frequency wireless signal at a time point.

For a dual-pass terminal supporting dual radio frequency (DR) mode, in the process of VCC handover, since the terminal can receive and transmit data in both the source network and the target network; therefore, there is a signal transmitted by the radio frequency module through the air interface. One module receives, thereby causing interference to the reception of another module.

The following takes the GSM multimode dual-pass terminal as an example to explain the above problems.

Please refer to FIG. 1 , which shows a block diagram of an existing GSM multi-mode dual-pass terminal, which includes:

A power management unit (PMU) that supplies power to the USIM card or SIM card, and supplies power to devices such as digital baseband chips, RF transceiver chips, RF switches, and memories;

A set of digital baseband chips (DBB) for processing I/Q signals in LTE and GSM modes, and digital baseband chips capable of implementing LTE, GSM and other mode transmission channels and receiving paths for control. The digital baseband chip can simultaneously process LTE and GSM I/Q signals; the digital baseband chip internally includes a clock processing unit, an I/Q data processing unit, a radio frequency control management unit, a SIM card processing unit, and a SOC unit;

Two sets of RF transceiver units, one is a radio transceiver unit that supports at least LTE radio frequency signals for receiving and transmitting LTE, and the other is a GSM radio transceiver unit that supports reception and transmission of GSM radio frequency signals. The LTE radio transceiver module includes at least a transceiver module (including a clock buffer, a PLL, etc.) that supports the reception and transmission of the LTE radio frequency signal, and a plurality of power amplification modules for amplifying the signal of each frequency band, and is disposed after the power amplification module to filter out the outband. A number of scattered band-pass filter modules are placed at the receiving end of the RF transceiver chip to filter out the spoke-sound filter modules that receive out-of-band spurious, a number of duplex devices for frequency division multiplexing, and two sets of antenna switches (one set for the path) One band switching, another band switching for channel two), two sets of RF antennas (one set for signal transmission and reception of path one, and one set for signal transmission and reception of path two).

The GSM radio transceiver unit includes a radio frequency transceiver module (including a clock buffer, a PLL, etc.) supporting at least the reception and transmission of the GSM radio frequency signal, and a GSM radio frequency front end connected to the radio transceiver module path; see FIG. 2, the GSM radio frequency front end The utility model comprises a power amplifier for performing signal amplification of each frequency band, two high-power filters for filtering out-of-band spurs after being placed in the power amplifier PA, and being placed at the receiving end of the RF transceiver module for filtering out the band of the receiving out-of-band spurs. Two filters, one set of antenna switches (for switching between transmit and receive paths of path one and path two), and one set of radio frequency antennas (ANT3) (for signal transmission and reception of path one and path two).

Assume that the transceiver chip of the GSM RF transceiver module can support at least the reception and transmission of signals in the GSM900 and DCS 1800 bands, the built-in ADC and the analog signal acquisition and analog signal output; and the above-mentioned path one is the GSM900 band, the above two are DCS 1800 band. The transmission signal of GSM900 is mainly composed of the useful signal of GSM900, the harmonic signals of the transmitted signal, and the broadband white noise of the transmitted signal. The useful signal transmitted by GSM900 can be regarded as the out-of-band blocking signal of the LTE (TD-SCDMA) receiving frequency band due to its large amplitude. As shown in Figure 3 It shows that the 2nd harmonic of the transmitted signal of GSM900 (1790MHZ-1820 MHz) falls in the receiving frequency band of Band39 (1880MHz-1920 MHz) with the 60 MHz in the future; the 3rd harmonic (2685MHz-2730 MHz) will fall. In the Band38 (2570-2620) receiving band out-of-band; but the third harmonic of GSM900 (2685MHZ-2730 MHz) falls within the Band7/41 receiving band, which will interfere with the Band7/41 high-band receiving performance. The specific calculation process is as follows: :

The receive band of Band7: is 2620MHz-2690 MHz, and the corresponding frequency band of 1/3 of the receive band is 873.33 MHz-896.67 MHz.

The correspondence between channel and frequency of EGSM is

880.2 MHz (975 channels)

889.8 MHz (1023 channels)

890.2 MHz (1 channel)

896.6 MHz (33 channels)

896.8 MHz (34 channels)

Therefore, the third harmonic frequency of each transmission channel is

880.2 MHz (975 channels) x3=2640.6 MHz

895 MHz (25 channels) x3=2685 MHz

889.8 MHz (1023 channels) χ3=2669·4 MHz

890.2 MHz (1 channel) χ3=2670·6ΜΗζ

896.6 MHz (33 channels) χ3=2689·8ΜΗζ

896.8 MHz (34 channels) 3=2690.4MHz

910 MHz (100 channels) 3=2730MHz

914.8 MHz (124 channels) 3=2744.4MHz

Therefore, when EGSM900 transmits on channel 975 to channel 1023 and channel 1 to channel 34, its 3rd harmonic will interfere with the Band7 and Band41 high-band receive channels. In order to solve this problem, the existing solution is to use high power between the output power amplifier and the antenna switch. Bandpass filtering to filter out the 3rd harmonic of the power amplifier output, as shown in Figure 4. However, the scheme shown in Figure 4 cannot solve the harmonic characteristics caused by the antenna switch. The 3rd harmonic characteristic of the common antenna switch is less than -70dBc. If it is the 35dBm GSM900 transmission signal, at the 3rd harmonic of the antenna switch. Signals of less than -35dBm will be generated. These spurious signals will still be transmitted through the GSM antenna and coupled to the Band7/41 receiving port through the air port, causing co-channel interference to their reception. Summary of the invention

The main technical problem to be solved by the present invention is to provide a communication terminal and a method for reducing interference of the communication terminal, and to reduce interference caused by spurious signals generated by the existing communication terminal in the communication process to the LTE reception of the communication terminal.

In order to solve the above problem, an embodiment of the present invention provides a communication terminal, including a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; the first working unit is an LTE working unit; The second working unit is a GSM working unit, a WCDMA working unit or a CDMA working unit;

The second working unit includes a signal transceiving module, a first antenna switch, a first filtering module, and a first antenna. The signal transceiving module includes a first frequency band signal transmitting submodule, and the signal transceiving module is configured to pass the first The first signal filtering module sends the signal to be sent to the first antenna switch, and sends the signal to the first filtering module by using the first antenna switch; After filtering processing, it is sent out through the first antenna.

In an embodiment of the present invention, the signal transceiver module further includes a first frequency band signal receiving submodule, and the signal transceiver module is further configured to receive, by the first frequency band signal receiving submodule, the first through the first An antenna and a signal transmitted by the first antenna switch.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal transmitting submodule, the second working unit further includes a second antenna switch and a second antenna, and the signal transceiver module is further configured to Passing the second frequency band signal transmitting submodule to pass the signal to be sent The second antenna switch is described and is outgoing through the second antenna.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal receiving submodule, and the signal transceiver module is further configured to receive, by the second frequency band signal receiving submodule, the second through the second a signal transmitted by the antenna and the second antenna switch.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal transmitting submodule, the second working unit further includes a second antenna switch, and the signal transceiver module is further configured to pass the The second-band signal transmitting sub-module sends the to-be-transmitted signal to the second antenna switch, and sends the signal to the first filtering module through the second antenna switch; the first filtering module is a multi-path filtering module, configured as After the signal to be transmitted is filtered, it is sent out through the first antenna.

In an embodiment of the present invention, the second working unit further includes a signal amplifying module, and the signal amplifying module is configured to perform amplification processing on the to-be-transmitted signal from the first frequency band signal transmitting sub-module Send to the first antenna switch.

In an embodiment of the present invention, the baseband unit includes an interference detection module, and further includes a first work unit control module and a second work for controlling operation of the first work unit and the second work unit, respectively. a unit control module; the interference detection module is configured to acquire control information of the first work unit control module and the second work unit control module, and determine the first work unit and the second according to the acquired control information Is there interference between the work units?

In an embodiment of the present invention, the second working unit further includes a second filtering module connected between the first frequency band signal transmitting submodule and the first antenna switch; the second filtering module And configured to filter the to-be-transmitted signal from the first-band signal sending sub-module and send the signal to the first antenna switch.

In an embodiment of the invention, the first filtering module and the second filtering module are harmonic filtering circuit modules. In order to solve the above problem, an embodiment of the present invention further provides a method for reducing interference of a communication terminal, where the communication terminal includes a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; a working unit is an LTE working unit; the second working unit is a GSM working unit, a WCDMA working unit or a CDMA working unit;

The second working unit includes a signal transceiving module, a first antenna switch, a first filtering module, and a first antenna; the signal transceiving module includes a first frequency band signal transmitting submodule, and the signal transceiving module passes the first frequency band The signal sending sub-module sends a signal to be sent to the first antenna switch, and sends the signal to the first filtering module through the first antenna switch;

The first filtering module filters the to-be-transmitted signal and sends it out through the first antenna.

In an embodiment of the present invention, the signal transceiver module further includes a first frequency band signal receiving submodule, and the signal transceiver module receives the first antenna and the device through the first frequency band signal receiving submodule. The signal sent by the first antenna switch.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal transmitting submodule, the second working unit further includes a second antenna switch and a second antenna, and the signal transceiver module passes the The second frequency band signal transmitting submodule passes the signal to be transmitted through the second antenna switch, and is sent out through the second antenna.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal receiving submodule, and the signal receiving and receiving module receives, by the second frequency band signal receiving submodule, the second antenna and the The signal sent by the second antenna switch is described.

In an embodiment of the present invention, the signal transceiver module further includes a second frequency band signal transmitting submodule, the second working unit further includes a second antenna switch, and the signal transceiver module passes the second frequency band signal The sending sub-module sends the to-be-transmitted signal to the second antenna switch, and sends the signal to the first filtering module by using the second antenna switch; the first filtering module filters the to-be-transmitted signal and then Passing out through the first antenna; the first filter The wave module is a multi-path filter module.

In an embodiment of the present invention, the second working unit further includes a signal amplifying module, and the signal amplifying module amplifies the to-be-transmitted signal from the first-band signal transmitting sub-module and sends the signal to The first antenna switch.

In an embodiment of the present invention, the second working unit further includes a second filtering module connected between the first frequency band signal transmitting submodule and the first antenna switch; the second filtering module And transmitting the to-be-transmitted signal from the first-band signal transmission sub-module to the first antenna switch.

In an embodiment of the present invention, the baseband unit includes an interference detection module, and further includes a first work unit control module and a second work unit control for controlling operation of the first work unit and the second work unit, respectively. Module

The interference detection module acquires control information of the first work unit control module and the second work unit control module, and determines whether there is a existence between the first work unit and the second work unit according to the acquired control information. interference.

In an embodiment of the present invention, the control information includes working frequency band information, working channel information, and transmitting power information; the interference detecting module determines the first working unit and the second working according to the acquired control information. Whether there is interference between units includes:

The interference detection module determines, according to the working frequency band information, whether there is interference in the working frequency bands of the first working unit and the second working unit;

If present, the interference detection module further determines, according to the working channel information, whether there is interference in the working channels of the first working unit and the second working unit;

If present, the interference detection module further determines whether there is interference between the first work unit and the second work unit based on the transmit power information.

In an embodiment of the present invention, the working channel information includes a center frequency of a transmission channel of the second working unit, a bandwidth occupied by a second working unit, and a first work order. The central frequency point of the meta-receiving channel, the bandwidth of the first working unit receiving channel, and the first working unit receiving performance non-degraded signal protection bandwidth; the transmit power information includes a transmit power level of the first working unit, and an interference power level;

The interference detecting module further determining, according to the working channel information, whether the working channel of the first working unit and the second working unit has interference includes:

The interference detecting module determines whether there is interference between the transmit channel of the second working unit and the receiving channel of the first working unit; if yes, determine whether 3x (F02-BW0/2, F02+BW0/2) MHz is included in ( F01-BWl/2- A BW, F01+BWl/2+A BW ) MHz; wherein, F02 is the central frequency point of the second working unit transmission channel, and BW0 is the occupied bandwidth of the second working unit transmitting signal, F01 The first working unit receives the center frequency of the channel, BW1 is the bandwidth of the first working unit receiving channel, and A BW is the first working unit receiving performance without degraded channel protection bandwidth; if the judgment includes, the interference detecting module further according to the Determining whether there is interference between the first working unit and the second working unit by using the transmit power information, including:

It is judged whether the power level transmitted by the second working unit is greater than the interference power level, and if not, it is determined that there is no interference; otherwise, it is determined that there is interference.

The beneficial effects of the embodiments of the present invention are:

The communication terminal provided by the embodiment of the present invention includes a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; the first working unit is an LTE working unit; and the second working unit is a GSM working unit and a WCDMA working unit. Or a CDMA work unit; the first work unit is configurable to receive data from the source network while the second work unit transmits data to the target network; the second work unit includes a signal transceiver module, a first antenna switch, a first filter module, and The first antenna; the signal transceiving module includes a first frequency band signal transmitting submodule, and the signal to be sent is sent to the first antenna switch by the first frequency band signal transmitting submodule, and then sent to the first through the first antenna switch And a filtering module, the first filtering module performs filtering processing on the to-be-transmitted signal, and then sends out through the first GSM antenna. It can be seen that the communication terminal provided by the embodiment of the present invention, A first filtering module is further disposed between the first antenna switch and the first antenna, and the first filtering module can filter the signal to be sent from the first antenna switch, so that the spur of the output of the first antenna switch can be The signal (including the 3rd harmonic) is filtered, thereby reducing the interference caused by the spurious signals generated by the second working unit of the terminal during the communication to the first working unit of the terminal. DRAWINGS

1 is a schematic structural diagram of a communication terminal;

2 is a schematic structural view of a GSM radio frequency front end in FIG. 1;

Figure 3 is a schematic diagram of the interference of the GSM900 band to other frequency bands;

Figure 4 shows a schematic diagram of another GSM RF front end;

FIG. 5 is a schematic structural diagram 1 of a communication terminal according to Embodiment 1 of the present invention; FIG.

6 is a schematic structural diagram 2 of a communication terminal according to Embodiment 1 of the present invention;

FIG. 7 is a schematic structural diagram 3 of a communication terminal according to Embodiment 1 of the present invention; FIG.

8 is a schematic structural view 1 of the first filter mode in FIG. 6;

9 is a schematic structural view 2 of the first filter mode in FIG. 6;

10 is a schematic structural view 3 of the first filter mode in FIG. 6;

Figure 11 is a fourth structural diagram of the first filter mode of Figure 6;

FIG. 12 is a schematic structural diagram 4 of a communication terminal according to Embodiment 1 of the present invention; FIG.

FIG. 13 is a schematic structural diagram 5 of a communication terminal according to Embodiment 1 of the present invention; FIG.

FIG. 14 is a schematic structural diagram of a baseband unit according to Embodiment 1 of the present invention; FIG.

FIG. 15 is a schematic flowchart of determining whether interference exists between a first working unit and a second working unit according to Embodiment 1 of the present invention;

16 is a schematic structural diagram of a communication terminal according to Embodiment 2 of the present invention;

17 is a schematic structural diagram 1 of the GSM radio frequency front end in FIG. 16;

18 is a schematic structural diagram 2 of the GSM radio frequency front end in FIG. 16;

FIG. 19 is a schematic diagram of determining an LTE working unit and a GSM working unit according to Embodiment 2 of the present invention; A schematic diagram of the flow of interference between them. The embodiment of the present invention provides a first filtering module between the first antenna switch and the first antenna of the communication terminal, where the first filtering module can filter the transmission signal from the first antenna switch, so The spurious signal outputted by the first antenna switch is filtered, and the spurious signal includes signals of the second harmonic signal, the third harmonic signal, and the broadband white noise; thus, the second working unit of the communication terminal is reduced during the communication process. Interference caused by spurious signals to the reception of the first working unit of the communication terminal.

In order to better understand the present invention, the present invention will be further described in conjunction with the specific embodiments.

Embodiment 1:

For the structure of the communication terminal provided in this embodiment, as shown in FIG. 5, the communication terminal includes: a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; wherein the first working unit is an LTE working unit The second working unit may be a GSM working unit, a WCDMA working unit or a CDMA working unit according to the working system; the first working unit in this embodiment may be configured to send data to the target network while the second working unit is transmitting The source network receives the data. That is, the communication terminal in the present invention may be a dual-pass terminal supporting dual radio frequency (DR) mode.

Referring to FIG. 6, the second working unit of the communication terminal in this embodiment includes a signal transceiver module, a first antenna switch, a first filtering module, and a first antenna. The signal transceiver module includes a first frequency band signal transmitting submodule (FIG. The first radio frequency signal transmitting submodule, the first antenna switch, the first filtering module, and the first antenna are sequentially connected; the signal transceiving module is configured to send the to-be-sent signal to the first through the first frequency band signal transmitting submodule An antenna switch sends the to-be-transmitted signal to the first filtering module. The first filtering module filters the to-be-transmitted signal and sends it out through the first antenna. It can be seen that, when the second working unit of the communication terminal in this embodiment sends data in the target network, the first antenna switch and the first antenna first filtering module can filter the to-be-transmitted signal from the first antenna switch to The spurious signals output by the first antenna switch (including harmonics, broadband white noise signals, etc.) are filtered out to prevent these spurious signals from being transmitted through the first antenna; therefore, the second working unit transmits data to the target network. At the same time, the interference generated when the first working unit receives data from the source network is greatly reduced.

In this embodiment, the first filtering module may select a specific implementation manner according to a specific application scenario. For example, the first filtering module may be a filter shown in FIG. C is grounded; the first filter module can also be a filter shown in Figure 8. The filter shown in Figure 9 is formed by using a bandpass filter on the path and connected in parallel with L and C. The first filter module can also be 9 The filter shown in Fig. 9 is composed of a low-pass filter on the path and a parallel C ground; the first filter module can also be a filter shown in Figure 10, and the filter shown in Figure 11 is in the path. It is composed of L//C and parallel L and C ground.

In this embodiment, the signal transceiver module further includes a first frequency band signal receiving submodule (not shown); as shown in FIG. 6, the signal transceiver module receives the first antenna through the first frequency band signal receiving submodule. And the signal sent by the first antenna switch.

The communication terminal in this embodiment may be a multi-mode communication terminal. As shown in FIG. 6, the signal transceiver module in this embodiment further includes a second frequency band signal transmission sub-module (not shown), and the second working unit. The second antenna switch and the second antenna are further included, and the signal transceiver module can further send the signal to be sent to the second antenna switch through the second frequency band signal transmitting submodule, and the second antenna switch sends the to-be-transmitted signal through the second antenna. .

The signal transceiver module further includes a second frequency band signal transmitting sub-module. As shown in FIG. 6, the signal transceiver module is further configured to receive, by the second frequency band signal receiving submodule, the signals sequentially sent through the second antenna and the second antenna switch.

Of course, when the communication terminal in this embodiment is a multimode communication terminal, the second working unit can also Only one antenna is included. Please refer to FIG. 7. The difference between FIG. 7 and FIG. 6 is that when the signal transceiver module includes the second frequency band signal transmitting submodule (not shown), the second working unit includes the second antenna switch. However, the second antenna is not included, and the signal transceiving module sends the to-be-transmitted signal to the second antenna switch through the second-band signal transmitting sub-module, and sends the signal to the first filtering module through the second antenna switch; After the signal to be transmitted is filtered, it is sent out through the first antenna. However, the first filtering module at this time is a multi-path filtering module, such as a Diplexer, and the multiplex filtering module can realize the problem of sharing one antenna in multiple frequency bands. For example, the multiplexed filter module can be configured to have two filtering working paths, one working in a low frequency band, such as 700 MHz-960 MHz, with a small differential loss in the low frequency band, and one path operating in a high frequency band, such as 1700 MHz-2690 MHz. There is a small difference in the high-band band, and proper isolation between the two channels is achieved, so that one antenna can be shared by the two frequency bands.

Referring to FIG. 12, the second working unit in this embodiment further includes a signal amplifying module disposed between the first frequency band signal transmitting submodule and the first antenna switch; the signal amplifying module is configured to transmit the first frequency band signal The to-be-sent signal sent by the sending sub-module is amplified and sent to the first antenna switch. Similarly, the signal amplifying module is further configured to amplify the to-be-transmitted signal sent by the second-band signal transmitting sub-module and send the signal to the second antenna switch.

In the communication terminal shown in FIG. 12, after the signal amplifying module filters the transmission signal, the output signal includes a spurious signal, and after the first antenna switch processes the transmission signal sent by the signal amplification module, the first antenna switch itself The output spurious signal is also generated, so the first filtering module between the first antenna switch and the first antenna needs to filter the superposition of the spurious signals generated by the signal amplifying module and the first antenna switch, so that it is at 3 There is a large in-band insertion loss at the subharmonic, which causes a large insertion loss in the receiving band and the transmitting band, which affects the receiving characteristics of the receiving band.

Referring to FIG. 13 , in order to solve the above problem, on the basis of FIG. 12 , a second filtering module is further disposed between the first frequency band signal transmitting submodule and the first antenna switch; The wave module is configured to filter the signal to be transmitted sent from the signal amplification module and then send the signal to the first antenna switch. The second filtering module performs filtering processing on the transmission signal amplified by the signal amplification module, and can filter the spurious signal output by the signal amplification module to avoid the spurious signal outputted at the first antenna switch as the signal amplification module and the first The superposition of spurious signals generated by an antenna switch reduces the in-band insertion loss of the first filter module at the 3rd harmonic, thereby reducing the influence on the receiving characteristics of the receiving band. It should be noted that both the first filtering module and the second filtering module in this embodiment may be harmonic filtering circuit modules.

Of course, the second filter module may be directly disposed between the first antenna switch and the first frequency band signal transmitting submodule of the signal transceiver module shown in FIG. 6 to reduce the band of the first filter module at the third harmonic. The insertion loss is internally reduced, thereby reducing the influence on the reception characteristics of the reception band.

In this embodiment, in addition to the first filtering module and the second filtering module shown in FIG. 13, a third filtering module may be disposed between the first antenna switch and the first frequency band signal receiving submodule, and the third filtering The module may specifically adopt a band pass filter configured to filter out the out-of-band signal included in the received signal; similarly, a fourth filtering module may be disposed between the second antenna switch and the second-band signal receiving sub-module, The fourth filtering module may also adopt a band pass filter configured to filter out the out-of-band signal included in the received signal; a fifth filtering module may be disposed between the second switch and the signal amplifying module, and the fifth filtering The module may configure a band pass filter and/or a low pass filter or the like to filter the spurious signals included in the transmission signal output from the signal amplification module.

Referring to FIG. 14 , the baseband unit in this embodiment includes an interference detection module, which is respectively configured to control a first working unit control module and a second working unit control module that work by the first working unit and the second working unit; The module acquires control information of the first work unit control module and the second work unit control module, and determines whether there is interference between the first work unit and the second work unit according to the acquired control information. The control information herein refers to information that the first work unit control module and the second work unit control module respectively control the work of the first work unit and the second work unit, and may include the work of the first work unit and the second work unit. Frequency band information, work Channel information, transmission power information (including transmission power level information and interference power level information, etc.); below, the interference detection module determines whether there is interference between the first working unit and the second working unit according to the acquired control information. Description:

In this embodiment, the control information of the first working unit control module for controlling the first working unit is reported to the interference detecting module; the second working unit control module also reports the control information about controlling the second working unit to the interference detecting module; Specifically, the working channel information in this embodiment may include a center frequency point of the second working unit transmission channel, a bandwidth occupied by the second working unit transmission signal, and a center frequency point of the first working unit receiving channel and the first working unit. The bandwidth of the receiving channel and the first working unit receiving performance are no deterioration signal protection bandwidth; the transmitting power information in the embodiment includes the transmitting power level information of the first working unit, and the interference power level information and the like. Referring to FIG. 15, the interference detecting module determines, according to the obtained control information, whether interference exists between the first working unit and the second working unit, including:

Step 1401: The interference detection module determines, according to the working frequency band of the first working unit and the working frequency band of the second working unit, whether there is interference in the working frequency band of the first working unit and the second working unit; determining whether there is interference according to the working frequency band may be The setting is determined according to the specific application scenario. For example, the method may be determined according to the criteria such as whether the two are superimposed or not, and the details are not described in this embodiment. If there is interference, step 1402 is performed: Otherwise, the steps are performed. 1405.

Step 1402: The interference detection module further determines, according to the working channel information, whether there is interference in the working channels of the first working unit and the second working unit. Specifically, the interference detecting module further determines the transmitting channel and the first working of the second working unit. Whether there is interference in the receiving channel of the unit; the specific calculation method for determining whether there is interference between the channels, that is, the method shown in FIG. 3, may not be described here; if it is determined that there is interference, step 1403 is performed; otherwise, step 1405 is performed.

Step 1403: Determine whether 3x (FO2-BWO/2, FO2+BWO/2) MHz is included in (F0i-BWl/2-ABW, F0i+BWl/2+ABW) MHz; where F0 ₂ is the second working unit The center frequency of the transmitting channel, BW0 is the occupied bandwidth of the transmitted signal of the second working unit, FOi is the central frequency point of the receiving channel of the first working unit, and BW1 is the bandwidth of the receiving channel of the first working unit,

The ABW is the first working unit receiving performance without degraded channel protection bandwidth; if the determination is not included, the executing step 1405, if included, performs step 1404;

Step 1404; determining whether the power level PCL transmitted by the second working unit is greater than the interference power level PCL, if not greater, performing step 1405; if greater than, performing step 1406;

Step 1405; Perform no first working network reselection and/or no second working network reselection. Step 1406: Perform a first working network reselection and/or perform a second working network reselection.

It can be seen that, in this embodiment, the detection process can quickly detect whether there is interference between the first working unit and the second working unit, and adjust the co-group network of the two to ensure normal communication.

Embodiment 2:

The second working unit in this embodiment may be a GSM working unit, a WCDMA working unit, or a CDMA working unit according to the network standard. In order to better understand the present invention, the communication terminal is a multimode GSM system. The dual-pass terminal is taken as an example to further illustrate the present invention. Referring to FIG. 16, the figure shows a schematic structural diagram of a communication terminal according to the embodiment. Compared with the communication terminal shown in FIG. 1, the difference is that the structure of the GSM radio frequency front end is different, and the GSM working unit includes two sets of GSM antennas, as shown in FIG. 17 and FIG.

According to FIG. 17, the GSM radio frequency front end of the communication terminal provided by the embodiment includes a GSM signal amplifying module and two sets of antenna switches, which are respectively a first GSM antenna switch and a second GSM antenna switch, and further includes corresponding Two sets of first GSM antenna (ANT3) and second GSM antenna (ANT4), a first filtering module is connected between the first GSM antenna switch and the first GSM antenna, and the first GSM antenna switch and the first GSM signal transceiver module are connected A third filtering module is connected between the band signal receiving submodules; the first GSM day A GSM signal amplifier is connected between the line switch and the first frequency band signal transmitting submodule of the GSM signal transceiver module;

The second GSM antenna switch and the second GSM antenna are directly connected, and the fourth GSM antenna switch and the second frequency band signal receiving submodule of the GSM signal transceiver module are connected with a fourth filtering module; the second GSM antenna switch and the GSM signal transceiver module A GSM signal amplifier is connected between the second frequency band signal transmitting submodules.

Referring to FIG. 18, FIG. 18 is different from FIG. 17 in that a second filtering module is further disposed between the first GSM antenna switch and the GSM signal amplifier.

The specific arrangement and function of each filter module in FIG. 17 and FIG. 18 have been described in detail in the first embodiment, and details are not described herein again.

The first frequency band signal transmitting submodule and the first frequency band signal receiving submodule are respectively a GSM900 signal transmitting submodule and a GSM900 signal receiving submodule, a second frequency band signal transmitting submodule and a second frequency band signal receiving submodule respectively being DCS1800 signals. The present invention is further described by the transmitting sub-module and the DCS1800 signal receiving sub-module. It should be understood that when the network system is different, the interference problem may also exist in the corresponding frequency band, for example, in the WCDMA900 and CDMA900 bands. The interference problem.

In the above application scenario, as shown in Figure 3, the transmit channel of the GSM work unit has the same-frequency interference to the receive channel of the LTE work unit in the Band7 and Band41 bands. Next, the principle for solving the above problem will be described with reference to the schemes shown in Figs. 17 and 18, respectively. Referring to FIG. 17, in the solution shown in the figure, the GSM900 signal transmitting sub-module amplifies the transmission signal through the GSM signal amplifying module, outputs the signal to the first GSM antenna switch, and then outputs the first GSM antenna switch to the first filtering module. The first filtering module filters the spurious signals (including the third harmonic signals) in the transmitted signal, and then sends out the first GSM antenna. The spurious signal here includes the spurious signal generated by the GSM signal amplification module and the first The spurious signal generated by the GSM antenna switch; therefore, the first GSM antenna switch here has a large in-band insertion loss at the 3rd harmonic.

In order to solve the above problem, please refer to FIG. 18, and FIG. 18 adds a second filtering module based on FIG. 17, and the working process is as follows:

The GSM900 signal transmitting sub-module amplifies the transmitted signal through the GSM signal amplifying module and outputs the signal to the second filtering module, and the second filtering module performs filtering processing on the spurious signals (including the third harmonic signal) included in the signal, that is, GSM The spurious signal outputted by the signal amplifying module is filtered, and then the filtered transmitting signal is sent to the first GSM antenna switch, and then output to the first filtering module via the first GSM antenna switch, and the first filtering module is in the transmitting signal. The spurious signal (including the 3rd harmonic signal) is filtered and processed by the first GSM antenna; the spurious signal processed by the first filtering module is mainly the spurious signal generated by the first GSM antenna switch; Therefore, the in-band insertion loss at the 3rd harmonic of the first GSM antenna switch at this time is much lower than that of the first filter module in FIG.

Correspondingly, the interference detection module obtains a corresponding control message by using the GSM work unit control module and the LTE work unit control module, and the process of determining whether the GSM work unit and the LTE work unit have interference is shown in FIG. 19, which includes:

Step 1801: The interference detection module determines, according to the working frequency band of the LTE working unit and the working frequency band of the GSM working unit, whether there is interference in the working frequency band of the LTE working unit and the GSM working unit; determining whether the interference exists according to the working frequency band may be determined according to a specific application. The scene selection setting, for example, may be judged according to whether the two are superimposed or not, and the details are not described in detail in this embodiment; if there is interference, step 1802 is performed: Otherwise, step 1805 is performed.

Step 1802: The interference detection module further determines, according to the working channel information, whether the working channel of the LTE working unit and the GSM working unit has interference; if yes, the interference detecting module further determines the transmitting channel of the GSM working unit and the LTE working unit. Whether the receiving channel There is interference; the specific calculation of whether there is interference between the channels, that is, the judgment method can adopt the scheme shown in FIG. 3, and will not be described again here; if it is determined that there is interference, step 1803 is performed; otherwise, step 1805 is performed.

Step 1803: Determine whether 3 X ( F0 _gsm -BW0/2, F0 _gsm +BW0/2 ) MHz is included in (F0it _e -BWl/2-ABW, F0 _lte +BWl/2+ABW ) MHz; where F0 _g j The center frequency of the GSM working unit transmission channel, BW0 is the occupied bandwidth of the GSM working unit transmission signal, ?0 is the central frequency point of the LTE working unit receiving channel, BW1 is the bandwidth of the LTE working unit receiving channel, and ABW is the LTE working unit Receive performance without degraded channel protection bandwidth; if the determination does not include, step 1805 is included, step 1804 is performed;

Step 1804; determining whether the power level PCL transmitted by the GSM unit is greater than the interference power level PCL, if not greater, performing step 1805; if greater than, performing step 1806;

Step 1805; GSM network reselection is not performed and/or LTE network reselection is not performed.

Step 1806; Perform GSM network reselection and/or perform LTE network reselection.

It can be seen that, when the second working unit of the communication terminal of the present invention sends data in the target network, the first antenna switch and the first antenna first filtering module can filter the signal to be sent from the first antenna switch to be processed. The spurious signals output by an antenna switch (including harmonics, broadband white noise signals, etc.) are filtered out to prevent these spurious signals from being transmitted through the first antenna; therefore, when the second working unit transmits data to the target network The interference generated when the first working unit receives data from the source network is greatly reduced.

At the same time, the invention can also quickly detect whether there is interference between the first working unit and the second working unit through the above detection process, and adjust the co-group network of the two to ensure the normal communication.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific implementation of the invention is not limited to the description. For those skilled in the art to which the present invention pertains, a number of simple ones can be made without departing from the inventive concept. Deduction or replacement is considered to be within the scope of protection of the present invention.

Industrial applicability

In the embodiment of the present invention, a first filtering module is disposed between the first antenna switch of the communication terminal and the first antenna, and the first filtering module can filter the transmission signal from the first antenna switch, so that the first antenna can be used. The spurious signal of the switch output is filtered out, and the spurious signal includes signals of 2nd harmonic signal, 3rd harmonic signal, broadband white noise, etc.; thus, the spurious signal generated by the second working unit of the communication terminal during communication can be reduced. Interference caused by the reception of the first working unit of the communication terminal.

Claims

Claim

A communication terminal, comprising: a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; the first working unit is an LTE working unit; and the second working unit is a GSM working unit a WCDMA working unit or a CDMA working unit; the second working unit includes a signal transceiving module, a first antenna switch, a first filtering module, and a first antenna; the signal transceiving module includes a first frequency band signal transmitting submodule, The signal transceiving module is configured to send the to-be-transmitted signal to the first antenna switch by using the first frequency band signal transmitting sub-module, and send the signal to the first filtering module by using the first antenna switch; The module is configured to filter the to-be-transmitted signal and send it out through the first antenna.

The communication terminal according to claim 1, wherein the signal transceiver module further comprises a second frequency band signal transmitting submodule, wherein the second working unit further comprises a second antenna switch and a second antenna, and the signal is transmitted and received. The module is further configured to pass the signal to be transmitted through the second antenna switch through the second frequency band signal transmitting submodule, and send out through the second antenna.

The communication terminal according to claim 1, wherein the signal transceiver module further includes a second frequency band signal transmitting submodule, the second working unit further includes a second antenna switch, and the signal transceiver module is further configured to Transmitting, by the second frequency band signal sending submodule, the signal to be sent to the second antenna switch, and sending the signal to the first filtering module by using the second antenna switch; the first filtering module is multiplexed And a module configured to filter the to-be-transmitted signal and send it out through the first antenna.

The communication terminal according to any one of claims 1 to 3, wherein the baseband unit includes an interference detecting module, and further includes a second for controlling the working of the first working unit and the second working unit, respectively a working unit control module and a second working unit control module; the interference detecting module is configured to acquire control information of the first working unit control module and the second working unit control module, and determine, according to the acquired control information, First work unit and said first Whether there is interference between the two work units.

The communication terminal according to any one of claims 1 to 3, wherein the second working unit further comprises a second connection between the first frequency band signal transmitting submodule and the first antenna switch a filtering module; the second filtering module is configured to filter the to-be-transmitted signal from the first-band signal transmitting sub-module and send the signal to the first antenna switch.

A method for reducing interference of a communication terminal, the communication terminal comprising a baseband unit, a first working unit and a second working unit respectively connected to the baseband unit; the first working unit is an LTE working unit; The second working unit is a GSM working unit, a WCDMA working unit or a CDMA working unit;

The method for reducing interference of a communication terminal according to claim 6, wherein the signal transceiver module further comprises a second frequency band signal transmitting submodule, and the second working unit further comprises a second antenna switch and a second antenna, The signal transceiving module passes the signal to be transmitted through the second antenna switch through the second frequency band signal transmitting submodule, and is sent out through the second antenna.

The method for reducing interference of a communication terminal according to claim 6, wherein the signal transceiver module further comprises a second frequency band signal transmitting submodule, wherein the second working unit further comprises a second antenna switch, and the signal is sent and received. The module sends a to-be-transmitted signal to the second antenna switch by using the second-band signal transmitting sub-module, and sends the signal to the first filtering module by using the second antenna switch; After the signal to be transmitted is subjected to filtering processing, it is sent out through the first antenna; the first filtering module is a multiplexing filter module.

The method for reducing interference of a communication terminal according to any one of claims 6 to 8, wherein the second working unit further comprises a signal transmitting sub-module connected to the first frequency band and the first antenna switch a second filtering module; the second filtering module performs filtering processing on the to-be-transmitted signal from the first-band signal transmitting sub-module, and then sends the signal to the first antenna switch.

The method for reducing interference of a communication terminal according to any one of claims 6 to 8, wherein the baseband unit includes an interference detection module, and further includes controlling respectively, the first working unit and the second working unit to work a first work unit control module and a second work unit control module;

The method for reducing interference of a communication terminal according to claim 10, wherein the control information includes working frequency band information, working channel information, and transmission power information; and the interference detecting module determines the first according to the acquired control information. Whether there is interference between the work unit and the second work unit includes:

12. The method for reducing interference of a communication terminal according to claim 11, wherein the working channel information comprises a center frequency of a transmission channel of the second working unit, a bandwidth occupied by a transmission signal of the second working unit, and a first work. The center frequency of the unit receiving channel, the first working unit The bandwidth of the receiving channel and the first working unit receiving performance are no deterioration signal protection bandwidth; the transmitting power information includes a transmitting power level of the first working unit, and further includes an interference power level;

The interference detection module determines whether there is interference between the transmit channel of the second working unit and the receive channel of the first working unit; if yes, determine whether 3x (FO2-BWO/2, FO2+BWO/2) MHz is included in ( FOi-BWI-ABW, F0i+BWl/2+ABW) MHz; wherein, F0 ₂ is the center frequency of the second working unit transmission channel, and BW0 is the occupied bandwidth of the second working unit transmitting signal, and FOi is the first The working unit receives the center frequency of the channel, BW1 is the bandwidth of the first working unit receiving channel, and ABW is the first working unit receiving performance without degrading channel protection bandwidth; if the judgment includes, the interference detecting module further performs the transmitting power information according to the Determining whether there is interference between the first working unit and the second working unit, including: