WO2012126248A1

WO2012126248A1 - Method and terminal for eliminating mutual interference between terminal modes

Info

Publication number: WO2012126248A1
Application number: PCT/CN2011/082297
Authority: WO
Inventors: 刘海广
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-22
Filing date: 2011-11-16
Publication date: 2012-09-27
Also published as: CN102148622A

Abstract

A method and terminal for eliminating mutual interference between terminal modes, the terminal comprising reception/transmission paths supporting a first mode and a second mode; the transmission path supporting the two modes comprises an antenna switch and a power amplifier (PA); the reception/transmission paths comprise a digital baseband (DBB) chip; the terminal further comprises a high-Q-value filter located between the antenna switch and the PA for filtering the signals to be transmitted in the two modes. The technical solution of the present invention effectively solves the problem of mutual interference in transmissions from dual-mode dual-standby terminals of the time division-synchronous code division multiple access (TD-SCDMA)/global system for mobile communication (GSM).

Description

Method and terminal for eliminating mutual interference between terminal modes

Technical field

The present invention relates to communication technologies, and in particular, to a method and a terminal for eliminating mutual interference between terminal modes.

Background technique

With the advent of the third generation of mobile communication (3G) era, data services have shown a spurt of development, especially as young people become more accustomed to making web calls, playing games, etc. while on the phone. Most of the terminals such as the handheld do not have the dual-mode dual-standby function, and occasionally the dual-mode dual-standby mobile phone, due to its time division synchronous CDMA (TD-SCDMA or TD) 1900 Voice/data services in the /2010MHz band and the Global System for Mobile communication (GSM) 900/1800MHz band voice and data services will work simultaneously with dual-mode interference, especially GSM 1800MHz and TD When 1900MHz is working at the same time, the transmission of either party will cause serious blockage to the other party's reception, resulting in the other party not working properly. It can be said that the dual-mode terminal currently on the market has not effectively solved the solution of dual-mode mutual interference. The phenomenon of simultaneous voice and data services is rare, and the more encountered is the phone, data. When the service would have been cut, or a system other work, another standard could not get through the phone, it does not adequately reflect the dual-mode phones should have features and superiority.

The conventional design of dual-mode dual standby mobile phones for TD-SCDMA and GSM currently on the market usually has two independent topologies, as shown in FIG. As can be seen from Figure 1, both TD-SCDMA and GSM transceivers have independent baseband chips (DBBs) and transceivers (Transceivers). The two types of transceiver systems work independently. Due to the limitations of the terminal printed circuit board (PCB) structure, The space between the modulo circuits is limited, and the isolation between the antennas is poor. When the dual-mode mobile phone is working at the same time, due to the nonlinear effects of radio frequency devices such as power amplifiers (PAs) and transceivers (Transceiver), GSM and TD are both If any one works, radiating large out-of-band spurs, harmonics, etc. in a small space will cause blocking or adjacent channel interference to the reception of another system; when the working frequencies of the two systems are adjacent or close to each other, For example, GSM DCS and TD F-band, because GSM is FDD duplex mode, DCS downlink (1805.2MHz-1879.8MHz) and TD F-band (1880.8MHz-l 919.2MHz) are adjacent, When dual-mode is working at the same time, the dual-mode dual-standby terminal cannot work normally because the adjacent frequency band will cause the worst co-channel interference and in-band blocking.

Summary of the invention

The present invention provides a method and terminal for eliminating mutual interference between terminal modes to solve the problem of mutual interference of transmission.

The present invention provides a method for eliminating mutual interference between terminal modes, the terminal supporting a first mode and a second mode, the method comprising: transmitting by a high-Q filter pair set on a transmission path of two modes Signal filtering;

The transmit path transmits the filtered transmit signal.

Preferably, the above method can have the following characteristics:

The high Q value filter includes a high Q film bulk acoustic wave resonance (FBAR) filter and a cavity filter.

Preferably, the above method may also have the following characteristics:

The high Q value filter is located between the antenna switch and the power amplifier (PA) in the transmit path. Preferably, the above method may also have the following characteristics:

After the transmitting path sends the filtered transmit signal, the method further includes: when the baseband chip (DBB) in the transmit and receive path detects that the terminal performs the first service in the first mode, and in the When the second mode has an access request of the second service, the transmit power of the first mode or the working rate of the first service is decreased.

Preferably, the above method may also have the following characteristics:

The first mode is a global mobile communication system (GSM) mode, the first service is a voice service, the second mode is a time division synchronous code division multiple access (TD) mode, and the second service is a data service; Or

The first mode is a TD mode, the first service is a data service, the second mode is a GSM mode, and the second service is a voice service. The present invention also provides a terminal, the terminal includes a transceiver path supporting the first mode and the second mode, and the transmission path supporting the two modes includes an antenna switch and a power amplifier (PA), and the transceiver path includes a baseband chip ( DBB), the terminal further includes a high Q value filter,

The high Q value filter is located between the antenna switch and the PA and is configured to: filter the transmit signals of the two modes.

Preferably, the terminal may have the following characteristics:

Preferably, the above terminal may also have the following features:

The DBB includes a protocol detection module, where the protocol detection module is configured to detect that the terminal performs the first service in the first mode, and when the second mode has an access request of the second service, The transmit power of the first mode or the operating rate of the first service is reduced.

Preferably, the above terminal may also have the following features:

The first mode is a Global System for Mobile Communications (GSM) mode, and the first service is a voice service;

The second mode is a Time Division Synchronous Code Division Multiple Access (TD) mode, and the second service is a data service.

Preferably, the above terminal may also have the following features:

The first mode is a TD mode, and the first service is a data service;

The second mode is a GSM mode, and the second service is a voice service.

The above method and terminal for eliminating mutual interference between terminal modes effectively solve the problem of transmitting mutual interference in the TD-SCDMA/GSM dual mode dual standby terminal. BRIEF abstract

1 is a schematic diagram of a circuit topology of a conventional dual mode dual standby transceiver circuit;

2 is a schematic structural diagram of an embodiment of a dual mode dual-transmission mutual interference suppression circuit according to the present invention; FIG. 3 is a schematic diagram of a topology structure of an embodiment of a dual mode dual standby circuit for improving dual-mode mutual interference according to the present invention; 4 is a spectrum distribution diagram of a DCS band and a TD F band according to the present invention;

FIG. 5 is a flow chart of protocol detection for simultaneously operating the F-band of the TD and the DCS band of the GSM introduced by the present invention. Preferred embodiment of the invention

The technical solution will be further described in detail below with reference to the accompanying drawings:

The invention proposes a method for solving dual-mode mutual interference of terminals such as TD-SCDMA and GSM dual-mode dual standby mobile phones, which introduces a high Q value filter such as a high Q value film bulk acoustic resonator (FBAR) filter at the transmitting end. The technology uses the high out-of-band rejection function of the filter in the terminal transmission to eliminate the spurs caused by the transmitter and effectively solve the problem of mutual interference caused by the dual-mode dual-standby terminal.

The invention also introduces a protocol detection mechanism. When the dual mode dual standby terminal works simultaneously, the GSM DCS frequency band (1805.2MHz-1879.8MHz) and the TD F frequency band (1880.8MHZ-1919.2MHz) are adjacent frequencies. The transmission of TD in the F-band is easy to block the reception of GSM in DCS. TD and GSM share a baseband chip. The introduced protocol detection can detect the dual-mode path in real time through the baseband chip, effectively solving the dual-mode dual-standby terminal working in DCS and TD. The F-band does not work properly.

The invention can effectively solve the problem of transmitting mutual interference in the TD-SCDMA/GSM dual mode dual standby terminal, and effectively avoids the mutual interference problem caused by the simultaneous operation of the dual mode by the out-of-band suppression function of the FBAR filter (Filter); The protocol detection mechanism can effectively solve the problem that the GSM DCS and the TD's F-band work cannot be accessed by the other party, and has practical value.

2 is a schematic structural diagram of an embodiment of a dual mode dual standby transmit interference rejection circuit according to the present invention. In this embodiment, a GSM900/1800, TD 1900/2010 is integrated between an antenna switch of a transmission path and a PA. The four-band out-of-band suppresses the high-Q Fbar Filter above 45db. The high-Q filter introduced has a narrow transition band and a strong out-of-band rejection. According to the general PA characteristics, the TD2010 band transmits signals to GSM. For example, the interference of the DCS receiver is as follows: the typical TD-SCDMA power amplifier has a noise of -134dBm/Hz in the DCS 1800 receiving band, and the GSM mode has a bandwidth of 200KHz per channel. Then the TD power is placed in the DCS 1800 band. The power is _134+101g (200000) = -81dBm. For GSM mode transmitters, The DCS 1800 band power amplifier has an output noise of -85dBm (RBW100KHz) in the TD band, and the TD channel bandwidth is 1.28MHz. The actual output noise of the power amplifier per TD channel is -85+101g (l.28/0.1) = -74dBm. This adds FBAR's out-of-band rejection of 45db and antenna isolation of about 15db. When TD-SCDMA and GSM dual-mode terminals work simultaneously, the mutual interference between TD's 2010 frequency band and GSM DCS frequency band can be greatly reduced, which can effectively improve. The dual-mode dual standby terminal simultaneously runs the quality of working voice and data services.

The introduced Fbar Filter has a narrow Q-band and a high Q-value. It has the advantage of large out-of-band attenuation, which can reduce the complex performance indicators of the terminal, such as transmitting spurs, even harmonics, radiated spurs, radiated disturbances, etc. In particular, when a plurality of terminals in the same cell work simultaneously, the solution can effectively reduce mutual interference when the dual-mode terminal works at the same time, and increase system capacity.

The present invention provides a terminal, the terminal includes a transceiver path supporting the first mode and the second mode, and the transmission path supporting the two modes includes an antenna switch and a power amplifier (PA), and the transceiver path includes a baseband chip (DBB) The terminal further includes a high-Q filter, and the high-Q filter is located between the antenna switch and the PA for filtering the two modes of the transmit signal.

The terminal can eliminate mutual interference between terminal modes, and the implementation process includes:

The transmitted signal is filtered by a high Q filter disposed on the transmit path of the two modes; the transmit path transmits the filtered transmit signal.

The above terminal including the high Q value filter can better solve the problem of transmitting mutual interference.

In addition, the DBB may include a protocol detection module, where the protocol detection module is configured to detect that the terminal performs a first service in the first mode, and has access to a second service in the second mode. When requested, the transmit power of the first mode or the working rate of the first service is reduced.

The first mode is a Global System for Mobile Communications (GSM) mode, the first service is a voice service, the second mode is a Time Division Synchronous Code Division Multiple Access (TD) mode, and the second service is data. business. Or the first mode is a TD mode, the first service is a data service, the second mode is a GSM mode, and the second service is a voice service.

Introducing a protocol detection module, which can realize the simultaneous operation of TD-SCDMA and GSM in dual mode in any frequency band, which can solve the problem that the dual mode in the current dual mode dual standby terminal cannot be in the full frequency band at the same time. The problem of work. Especially for the worst GSM DCS bands (1800MHz TX: 1710.2MHz-1784.8MHz, RX: 1805.2MHz-1879.8MHz) and TD's F-band (1880.8MHz-1899.2MHz), in either the DCS or TD F-band In the data (PS) service, the protocol detection module detects the signal of the voice (CS) channel in real time to confirm whether the CS has voice telephone access. If there is a CS telephone access, the protocol detection part informs the PS module to reduce the data service. The rate or temporary suspension can avoid the problem that the F-band of the GSM DCS and the TD in the dual-mode dual standby cannot be compatible, so that the CS voice cannot be accessed when the terminal performs the PS service.

Of course, for other frequency bands of GSM, such as the 900 frequency band and other frequency bands of the TD, such as the F-band, there is also a problem that another service access is affected when there is one service, but there is no GSM DCS band and TD F-band. The problem is serious.

It should be noted that the foregoing protocol detection module may be located in the DBB shown in FIG. 1, that is, two interconnected protocol detection modules are provided in the DBB of two modes; in addition, the two DBBs may also be The protocol detection module is combined into one, as shown in Figure 3.

As shown in FIG. 3, it is a schematic diagram of a topology structure of a dual-mode dual-standby circuit embodiment for improving dual-mode mutual interference according to the present invention. The introduced protocol detection module can effectively solve the F-band of TD-SCDMA (1880.8MHz-l 919.2MHz). ) and the GSM DCS (1800MHz TX: 1710.2MHz-1784.8MHz, RX: 1805.2MHz-l 879.8MHz), the problem of communication cannot be established when dual-mode operation. The spectrum distribution of the DCS and TD F bands is shown in Figure 4. From the spectrum structure, the last channel of the DCS downlink is adjacent to the 9404 channel band of the F band of the TD. No measures are taken. In theory, the two The frequency band cannot work at the same time. By adding a protocol detection module and adjusting the dual mode working state, the dual mode dual standby terminal can work simultaneously on the two adjacent frequencies.

As shown in FIG. 5, a protocol detection flowchart for simultaneously operating the F-band of the TD and the DCS band of the GSM introduced by the present invention, when the F-band of the TD-SCDMA is in a transmitting state, and the DCS band of the GSM is simultaneously in a receiving state, At this time, the F-band of the TD is adjacent to the DCS of the GSM. When the TD transmits at the maximum power of 24 dBm, the reception of the DCS of the GSM is very badly affected, causing the DCS to receive congestion and fail to establish communication, such as the terminal in the TD F. The frequency band performs the PS service. At this time, if the CS of the GSM network (referred to as the G network) has voice call access, the CS voice call of the G network cannot be established due to the reception blocking, and the introduced protocol detection module can be in the TD. When the PS service is performed, the CS channel of the G network is detected in real time for voice access. For example, when the PS service of the TD is performed, the CS access of the G network is detected, and the protocol detection module notifies the control module of the DBB, and the control of the DBB. By reducing the TD transmit power or reducing the PS service rate to ensure the access of the G network CS voice call, the module can ensure the success of the random access of the TD-SCDMA and GSM dual mode dual standby terminals, thereby realizing the dual mode terminal in two modes. At the same time work normally.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program that instructs the associated hardware to be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the invention. It should be understood by those skilled in the art that the present invention may be modified or equivalently substituted without departing from the spirit and scope of the invention.

Industrial applicability

The above method and terminal for eliminating mutual interference between terminal modes effectively solve the problem of transmitting mutual interference in the TD-SCDMA/GSM dual mode dual standby terminal.

Claims

Claim

A method for eliminating mutual interference between terminal modes, the terminal supporting a first mode and a second mode, the method comprising:

The transmitted signal is filtered by a high Q filter placed on the transmit path of both modes;

The transmit path transmits the filtered transmit signal.

2. The method according to claim 1, wherein

3. The method according to claim 1, wherein

The high Q value filter is located between the antenna switch and the power amplifier (PA) in the transmit path.

4. A method according to any of claims 1-3, wherein

5. The method according to claim 4, wherein

The first mode is a TD mode, the first service is a data service, the second mode is a GSM mode, and the second service is a voice service.

A terminal, the terminal includes a transceiver path supporting the first mode and the second mode, and the transmission path supporting the two modes includes an antenna switch and a power amplifier (PA), and the transceiver path includes a baseband chip (DBB). Wherein, the terminal further includes a high Q value filter,

The high Q filter is located between the antenna switch and the PA, and is configured to: filter the two modes of the transmit signal.

7. The terminal according to claim 6, wherein

8. The terminal according to claim 6 or 7, wherein

The DBB includes a protocol detection module, where the protocol detection module is configured to: detect that the terminal performs the first service in the first mode, and when the second mode has an access request of the second service, The transmit power of the first mode or the operating rate of the first service is reduced.

9. The terminal according to claim 8, wherein

10. The terminal according to claim 8, wherein

The first mode is a TD mode, and the first service is a data service;

The second mode is a GSM mode, and the second service is a voice service.