WO2011144064A2 - Mobile terminal and method for reducing mutual interference in mobile terminal - Google Patents

Abstract

A mobile terminal and a method for reducing mutual interference in mobile terminal are provided in the present invention. The terminal comprises: a mobile communication module, a Fixed Part of Digital Enhanced Cordless Telecommunications (DECT FP), a main processor, a first filter and a second filter; the mobile communication module communicates with Global System of Mobile communication (GSM); the FP works in predetermined frequency band and communicates with a Portable Part of Digital Enhanced Cordless Telecommunications (DECT PP); the main processor implements the communication between the FP and the mobile communication module; the first filter filters out the DECT signals received by the mobile communication module in predetermined frequency band; the second filter filters out the noise signals transmitted by the FP, wherein the noise signals are in the frequency band received by the mobile communication module, and the GSM signals received by the FP in predetermined frequency band.

Description

 Mobile terminal and method for reducing internal mutual interference of mobile terminal

Technical field

 The embodiments of the present invention relate to the field of communications technologies, and in particular, to a mobile terminal and a method for reducing internal mutuality of the mobile terminal. Background technique

 The mobile terminals in the prior art are all a user identity module (Subscriber Identity Module, called: SIM) corresponding to a mobile terminal, and there is no application of an extension or a slave, and an effective communication sharing cannot be realized. In order to solve this problem, the mobile communication module and the fixed part (Fixed Part, referred to as: FP) of the Digital Enhanced Cordless Telecommunications (DECT) may be integrated in the mobile terminal, and moved. The terminal uses the mobile communication module to access the mobile communication network, and uses the DECT FP to establish a communication connection with a plurality of portable parts (PP), so that multiple PPs connected to the DECT FP can pass the SIM in the mobile terminal. The card communicates with the mobile communication network.

 Since the mobile communication module and the DECT FP are both wireless communication modules, both wireless signals need to be transmitted and received. When the working frequency bands of the two are close to each other, mutual interference problems occur. The Global System of Mobile communication (GSM) system operates in most countries and regions with a frequency band of 900MZ1800M, using frequency division duplex mode. For mobile terminals of the GSM system, its high frequency band is 1800M. The transmitting frequency band is 1710. lM~1784.9MHz, and the receiving frequency band is 1805.lM~1879.9MHz. DECT PP operates in most countries and regions from 1880.928M to 1890.208MHz, and uses time division duplex mode to transmit and receive the same frequency. This allows the receiving band of the GSM1800 to be adjacent to the operating band of the DECT 1800 without a guard band.

Since the working frequency band is adjacent and there is no guard band, the interference signal between the mobile communication module and the DECT cannot be effectively suppressed, and the signal transmitted between the FP and the PP of the DECT will directly enter. The GSM1800 system interferes with its reception of useful signals, causing the mobile communication module receiver to block. Similarly, the mobile communication module transmitting signals will block the DECT FP receiving signals, affecting its normal operation. Summary of the invention

 The embodiments of the present invention provide a mobile terminal and a method for reducing mutual interference of the mobile terminal, which are used to solve the problem of mutual interference between the mobile communication module and the DECT FP in the mobile terminal integrated with the mobile communication module and the DECT FP in the prior art.

 An embodiment of the present invention provides a mobile terminal, including: a mobile communication module, a fixed portion FP of a digital enhanced cordless telephone system DECT, a main processor, a first filter, and a second filter;

 The mobile communication module is configured to communicate with a global mobile communication system GSM;

 The FP operates in a predetermined frequency band for communicating with the portable portion PP of the DECT; the main processor is connected to the mobile communication module and the FP, respectively, for implementing between the FP and the mobile communication module. Communication

 The first filter is electrically connected to the mobile communication module, and is configured to filter out a DECT signal of the predetermined frequency band received by the mobile communication module;

 The second filter is electrically connected to the FP of the DECT, and is configured to filter out a noise signal that is sent by the FP in a receiving frequency band of the mobile communication module, and a GSM signal that is received by the FP in the predetermined frequency band. .

 An embodiment of the present invention provides a method for reducing internal interference of a mobile terminal, including:

 Filtering, by the first filter connected to the mobile communication module, the DECT signal of the predetermined frequency band received by the mobile communication module;

 And filtering, by the second filter connected to the FP, the noise signal emitted by the FP in the receiving frequency band of the mobile communication module and the GSM signal of the predetermined frequency band received by the FP.

The mobile terminal and the method for reducing internal mutual interference of the mobile terminal in the embodiment of the present invention, by restricting the DECT from operating in a predetermined frequency band, and filtering the DECT of the predetermined frequency band received by the mobile communication module by using the first filter connected to the mobile communication module Signal, filtered by a second filter connected to the FP of the DECT In addition to DECT, the noise signal in the receiving frequency band of the mobile communication module and the GSM signal in the predetermined frequency band received by the FP are transmitted. The mutual interference between the mobile communication module and the DECT in the mobile terminal is effectively reduced. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 FIG. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;

 FIG. 2 is a flowchart of a method for reducing internal interference of a mobile terminal according to an embodiment of the present invention. detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. As shown in FIG. 1, the mobile terminal includes: a mobile communication module 101, a FP102 of DECT, a main processor 103, a first filter 104, and a second filter. 105. The mobile communication module 101 is configured to communicate with the GSM, and the FP102 of the DECT operates in a predetermined frequency band for communicating with each PP201 of the DECT. The main processor 103 is respectively connected to the mobile communication module 101 and the FP 102 for implementing the FP102 and The communication between the mobile communication module 101, the first filter 104 is electrically connected to the mobile communication module 101, and is used for filtering out the DECT signal in the predetermined frequency band received by the mobile communication module 101, and the second filter 105 and the FP102 of the DECT The electrical connection is used to filter out the noise signals emitted by the FP102 and the PP201 in the receiving frequency band of the mobile communication module 101 and the GSM signals in the predetermined frequency band received by the FP 102. Wherein, the first filter The device 104 can be electrically connected to the antenna of the mobile communication module 101, and the second filter 105 can be electrically connected to the antenna of the FP102.

 The DECT transmitting the noise signal in the receiving frequency band of the mobile communication module 101 can be understood as: Suppose the DECT transmitting signal operates at a frequency of 1890 MHz, and the actual transmitted signal is at 10 MHz, that is, at 1880 M, there is also a signal, of course, this signal Not as big as 1890M. A signal with a small difference between the operating frequency and 1880M can be understood as a noise signal, or it can also be called a spurious signal.

 It should be noted that the DECT signal is an interaction signal between the FP102 and the PP201. For the mobile communication module 101, the working frequency band of the DECT signal is the working frequency band specified by the standard organization. In the embodiment of the present invention, a frequency band is selected as a predetermined frequency band in a working frequency band of the DECT signal, and the predetermined frequency band may be from a first predetermined frequency point to a second predetermined frequency point, where the first predetermined frequency point is smaller than the second predetermined frequency point. . In order to ensure that there is a certain protection band between the working frequency band of the DECT and the receiving frequency band of the mobile communication module 101, the first predetermined frequency point needs to be greater than 1880 MHz. The selection of the first predetermined frequency point may be determined according to the size of the guard band. For example, if the guard band is 10 MHz, the first predetermined frequency point may be selected to be 1890 MHz. The second predetermined frequency point may be 1900 MHz or less, preferably 1900 MHz.

 In a preferred embodiment, the passband of the first filter 104 is a signal of a GSM receiving frequency band of 1805 MHz to 1880 MHz, and the stop band is a signal of a 1890 MHz-1900 MHz transmitted by the DECT. The pass band of the second filter 105 is a signal of 1890MHz-1900MHz in the DECT operating band, and the signals of the 1805MHz-1880MHz and 1705MHz-1880MHz are blocked.

 The second filter 105 needs to suppress the noise signal falling from 1805MHz to 1880MHz generated by the DECT transmission. When the noise signal is received by the mobile communication module 101, the same frequency interference is generated. In addition, the second filter 105 also needs to suppress the mobile communication module 101 from transmitting signals at 1705 MHz to 1880 MHz. Although this signal is not the DECT operating band, since the signal power is too large, if the receiver front end of the DECT does not have sufficient suppression, This will cause the DECT front-end receiver to saturate.

DECT's FP102 and its multiple PP201 operate in a predetermined frequency band. There may be multiple available channels in this frequency band. PP201 and FP102 preferably use the highest available intermediate channel frequency in the predetermined frequency band. Channel. For example, the predetermined frequency band is 1890MHz to 1900MHz. In this frequency band, the number of available channels is five, and the frequency points are recorded from high to low as channel 0, channel 1, channel 2, channel 3 and channel 4. It should be noted that the channel number and the corresponding specific operating frequency are specified by the standard organization, for example, channel 0 is 1897.344 MHz, and channel 5 is 1888.704 MHz. Then, the FP 102 of the DECT and its plurality of PPs 201 preferably use channel 0.

 When the channel needs to be switched, for example, the signal quality of the current channel is unacceptable or the current channel has interference, the channel needs to be reselected, and the available channels that meet the connection establishment conditions are selected, such as available channels with good signal quality and small interference; or new The user needs to occupy a new channel and needs to apply for a channel again. DECT's FP102 and its multiple PP201s are gradually switched to the lower frequency channel to reduce the influence of system mutual interference.

 Specifically, FIG. 2 is a flow chart of a method for reducing internal interference of a mobile terminal according to an embodiment of the present invention. The mobile terminal shown in FIG. 2 may refer to the mobile terminal provided in the foregoing embodiment, and details are not described herein. As shown in Figure 2, the method includes:

 Step 201: PP201 and FP102 negotiate a working channel, that is, establish a connection on channel N; wherein, channel N is an available channel operating in a predetermined frequency band. The initial value of N starts from the value of the signal with the highest frequency in the allowed range.

 The predetermined frequency band may be from a first predetermined frequency point to a second predetermined frequency point, the first predetermined frequency point being less than the second predetermined frequency point. In order to ensure that there is a certain guard band between the working frequency band of the DECT and the receiving frequency band of the mobile communication module 101, the first predetermined frequency point needs to be greater than 1880 MHz. The selection of the first predetermined frequency point may be based on the size of the guard band. For example, if the guard band is 10 MHz, the first predetermined frequency point may be selected to be 1890 MHz. The second predetermined frequency point may be 1900 MHz or less, preferably 1900 MHz.

 For example, the predetermined frequency band is 1890MHz to 1900MHz. In this frequency band, the number of available channels is five, and the frequency points are recorded from high to low as channel 0, channel 1, channel 2, channel 3 and channel 4. It should be noted that the channel number and the corresponding specific operating frequency are specified by the standard organization, for example, channel 0 is 1897.344 MHz, and channel 5 is 1888.704 MHz. In this embodiment, channel 0 is preferably used.

Step 202: The PP201 and the FP102 determine, according to the environment, whether to establish a connection on the channel N. If yes, establishing a connection on channel N, ending the method;

 If no, go to step 203.

 The determining whether to establish a connection on the N channel according to the environment may include: detecting whether there is interference on the frequency of the channel N, and how the signal quality is equal. If there is interference or the signal quality is not good, the connection is not established on channel N, that is, channel N is an available channel that does not meet the establishment conditions. It should be noted that how to judge the signal quality has specific evaluation criteria specified in the DECT protocol. For details, see ETSI ETR 310 [9], which is not described here.

 Step 203: The value corresponding to the channel with the highest frequency in the allowed range is used as the number of N, and the step is performed.

201.

 The mobile terminal provided by the embodiment of the invention and the method for reducing internal mutual interference of the mobile terminal

The DECT operates in a predetermined frequency band, and then filters the DECT signal of the predetermined frequency band received by the mobile communication module through the first filter connected to the mobile communication module, and filters the DECT transmission through the second filter connected to the FP of the DECT. The communication module receives the noise signal in the frequency band and the GSM signal of the predetermined frequency band received by the FP, thereby effectively reducing the mutual interference between the mobile communication module and the DECT in the mobile terminal.

 A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

 It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request  A mobile terminal, comprising: a mobile communication module, a fixed portion FP of a digital enhanced cordless telephone system DECT, a main processor, a first filter, and a second filter;  The mobile communication module is configured to communicate with a global mobile communication system GSM;  The FP operates in a predetermined frequency band for communicating with the portable portion PP of the DECT; the main processor is connected to the mobile communication module and the FP, respectively, for implementing between the FP and the mobile communication module. Communication  The first filter is electrically connected to the mobile communication module, and is configured to filter out a DECT signal of the predetermined frequency band received by the mobile communication module;  The second filter is electrically connected to the FP of the DECT, and is configured to filter out a noise signal that is sent by the FP in a receiving frequency band of the mobile communication module and a GSM signal that is received by the FP in the predetermined frequency band. .  The mobile terminal according to claim 1, wherein the first filter is electrically connected to an antenna of the mobile communication module; and the second filter is electrically connected to an antenna of the FP.  The mobile terminal according to claim 1 or 2, wherein the working channels of the PP and the FP of the DECT are: the channel with the highest intermediate frequency of the available channels in the predetermined frequency band.  The mobile terminal according to any one of claims 1 to 3, wherein the predetermined frequency band is from a first predetermined frequency point to a second predetermined frequency point, and the first predetermined frequency point is smaller than the a second predetermined frequency point, the first predetermined frequency point being greater than 1880 MHz, and the second predetermined frequency point being less than or equal to 1900 MHz.  The mobile terminal according to claim 4, wherein the first predetermined frequency point is 1890MHz, the second predetermined frequency point is 1900MHz.  A method for reducing internal interference of a mobile terminal according to any one of claims 1 to 5, characterized in that it comprises:  Filtering, by the first filter connected to the mobile communication module, the DECT signal of the predetermined frequency band received by the mobile communication module; Filtering the FP transmission through the second filter connected to the FP to connect to the mobile communication module And a GSM signal in the predetermined frequency band received by the FP.  The method according to claim 6, wherein the method further comprises: the FP negotiating a working channel with the PP, where the working channel is an available channel in the predetermined frequency band.  The method according to claim 6 or 7, wherein the FP and the PP select the channel with the highest frequency as the working channel among the available channels that meet the establishment connection condition.  The method according to any one of claims 6 to 8, wherein the predetermined frequency band is from a first predetermined frequency point to a second predetermined frequency point, and the first predetermined frequency point is smaller than the a second predetermined frequency point, the first predetermined frequency point is greater than 1880 MHz, and the second predetermined frequency point is less than or equal to 1900 MHz.  10. The method according to claim 9, wherein the first predetermined frequency point is 1890 MHz, and the second predetermined frequency point is 1900 MHz.