CN101814924A - Mobile terminal and method for switching frequency bands - Google Patents
Mobile terminal and method for switching frequency bands Download PDFInfo
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- CN101814924A CN101814924A CN200910078290A CN200910078290A CN101814924A CN 101814924 A CN101814924 A CN 101814924A CN 200910078290 A CN200910078290 A CN 200910078290A CN 200910078290 A CN200910078290 A CN 200910078290A CN 101814924 A CN101814924 A CN 101814924A
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Abstract
The invention discloses a mobile terminal and a method for switching frequency bands. The mobile terminal comprises a plurality of antennae with different frequency bands, a plurality of radio frequency channels, and a baseband processor, wherein the antennae are used for receiving and sending signals; each one of the plurality of the radio frequency channels corresponds to one antenna of the plurality of the antennae with the different frequency bands; and the baseband processor is connected with each one of the plurality of the radio frequency channels, is used for acquiring a control signal which is used for controlling a first radio frequency channel in the plurality of radio frequency channels, and controls the first radio frequency channel and a first antenna, corresponding to the first radio frequency channel, in the plurality of the antennae to work based on the control signal. Besides, the antennae are realized by using correlative metal structural members, so the mobile terminal can cover a plurality of frequency bands and the volume is reduced.
Description
Technical field
The present invention relates to the communications field, more specifically, the frequency band switching method that relates to a kind of portable terminal and use this portable terminal to realize.
Background technology
The increase of communication requirement, more and more higher to the requirement of communication speed, communications band is more and more wideer, and especially present communication system is from 2G to 3G, even the 4G development, and frequency range is constantly expanded, and for example, 2G need support 900MHz and 1800MHz.The adding of 3G makes portable terminal not only need to support above two frequency ranges, and TD-SCDMA also will support 1900MHz, 2100MHz and 2300MHz.UMTS need support 900MHz, 1700MHz and many frequency ranges of 2100MHz, and this frequency to antenna requires more and more; In addition, mobile terminal design trends towards ultra-thin, miniaturization Design, and area and volume that multiband aerial requires are increasing; For sound construction, ID is attractive in appearance, needs to adopt a lot of hardwares in the design simultaneously, and antenna must could guarantee the performance of antenna with these hardwares maintenance certain distances, is difficult to realize the miniaturization Design of portable terminal.Comprehensive the above, the broad-band antenna performance becomes the difficult problem of multi-modulation scheme mobile terminal design.
At the problems referred to above, Fig. 1 shows the realization block diagram of existing antenna equipment, in existing antenna equipment, adopts two kinds of schemes to support multiband communication usually.
First kind of scheme: guarantee that antenna and metal structure or board circuit distance is greater than 5cm, various communication standards and frequency range all adopt the same antenna, baseband processing chip provides multiplexed control signal, the control multiplexer switch determines that antenna links to each other with the radio frequency path of a certain frequency range of a certain standard, and portable terminal is radiated the space by antenna with radiofrequency signal and carries out the signal transmission.This antenna adopts humorous wave method to realize the dual frequency characteristics of antenna, as: support the 900MHz frequency range, also support second harmonic 1800MHz frequency range, to adopting coupling unit to expand with the 1900MHz frequency range.This implementation method, coupling unit is bigger to the influence of radiating element, and the radiation efficiency of antenna can be affected, and the multiband aerial performance is difficult to realize.
Second kind of scheme: guarantee that antenna and metal structure or circuit board distance is greater than 5cm.Various communication standards and frequency range all adopt the same antenna, and baseband processing chip provides multiplexed control signal, determine that antenna links to each other with the radio frequency path of a certain frequency range of a certain standard, and portable terminal is radiated the space by antenna with radiofrequency signal and carries out the signal transmission.Antenna adopts many radiating elements to realize the multifrequency characteristic of antenna, adopts four radiating element expansions to realize as supporting 900MHz, 1800MHz, 1900MHz and 2100MHz simultaneously.This implementation method, the distance between the branch units is very near, and the mutual coupling between the radiating element is increased, and will influence the radiation efficiency of antenna, makes the multiband aerial performance be difficult to realize.
Summary of the invention
Technical problem to be solved by this invention has been to provide a kind of a plurality of frequency ranges and little portable terminal and frequency band switching method of volume of being applicable to.
According to an aspect of the present invention, provide a kind of communicating terminal, having comprised: the antenna of many different frequency ranges, antenna are used to carry out the reception and the transmission of signal; A plurality of radio frequency paths, each radio frequency path in a plurality of radio frequency paths is corresponding with a antenna in the antenna of many different frequency ranges; And baseband processor, be connected with each radio frequency path in a plurality of radio frequency paths, be used to obtain a control signal, control signal is used for controlling first radio frequency path of a plurality of radio frequency paths, and controls first radio frequency path and the first antenna work corresponding with first radio frequency path in many antennas based on control signal.
Preferably, portable terminal also comprises: a plurality of multiplex switch, each multiplex switch in the multiplex switch is corresponding with a antenna in the antenna of many different frequency ranges, be used for a plurality of radio frequency paths of the near frequency band of a plurality of radio frequency paths are corresponded to an antenna, and according to second radio frequency path in a plurality of radio frequency paths of controlling near frequency band by control signal and the second antenna work corresponding with second radio frequency path in many antennas.
Preferably, baseband processor also is used to send the base band control signal to control first radio frequency path and the first antenna work, and wherein control signal can comprise: radio frequency path is selected information.
Preferably, the base band control signal also comprises: day line options information.
Preferably, the base band control signal comprises: Frequency Band Selection information and standard are selected information.
Preferably, one or more in the antenna of many different frequency ranges is to be that the structural member of metal or its constitute by portable terminal to small part.
Preferably, portable terminal also comprises: the time-sharing multiplex switch, be used for when the GSM/TD-SCDMA standard, and one of antenna of selecting many different frequency ranges is as receiving the time division multiplexing antenna of path with the emission path, and carries out the switching of signal time-division transmitting-receiving.
Preferably, portable terminal also comprises: mixer, be arranged between transmission, reception path and the antenna of radio frequency path, and be used for when the UMTS/CDMA standard, close the road to receiving path and transmission path.
According to a further aspect in the invention, also provide a kind of frequency band switching method of portable terminal, portable terminal comprises: the antenna of many different frequency ranges, antenna are used to carry out the reception and the transmission of signal; A plurality of radio frequency paths, each radio frequency path in a plurality of radio frequency paths is corresponding with a antenna in the antenna of many different frequency ranges; And baseband processor, be connected with each radio frequency path in a plurality of radio frequency paths; Frequency band switching method may further comprise the steps: receive a control signal, control signal is used for controlling first radio frequency path of a plurality of radio frequency paths; Control first radio frequency path carries out signal by first corresponding with first radio frequency path in the many antennas antenna reception and transmission based on control signal.
Preferably, before receiving a control signal, also comprise step: detect mobile terminal state automatically and whether satisfy switching condition,, send control signal if satisfy switching condition.
Preferably, switching condition is specially the radio frequency path effect of can't working or work and does not satisfy predetermined demand.
Preferably, before receiving a control signal, also comprise step: receive user's switching command, send control signal.
Preferably, control described first radio frequency path and in many antennas the first antenna work corresponding with first radio frequency path be specially: obtain the transfer sequence table, the transfer sequence table comprises that first radio frequency path selects information; Obtain first radio frequency path and select information, first radio frequency path is selected corresponding first radio frequency path of information; Send the base band control signal; Determine first radio frequency path; Determine first antenna of the first radio frequency path correspondence; First radio frequency path carries out the reception and the transmission of signal by first antenna.
Preferably, when portable terminal also comprises a plurality of multiplex switch, control first radio frequency path and in many antennas the first antenna work corresponding with first radio frequency path be specially: obtain the transfer sequence table, the transfer sequence table comprises that the first Frequency Band Selection information and first standard select information; Obtain the first Frequency Band Selection information and first standard and select information; Send the base band control signal, the base band control signal comprises the first Frequency Band Selection information and first standard selection information; Determine first radio frequency path according to the first Frequency Band Selection information and the first standard selection information; Believe that according to first frequency range then information and the first standard selection information are determined first multiplex switch, and determine first antenna that is connected with first multiplex switch; First radio frequency path carries out the reception and the transmission of signal by first antenna.
Preferably, control based on control signal first radio frequency path by many antennas in first antenna corresponding with first radio frequency path carry out the reception of signal and send after also comprise step: when the acceptance of signal with when sending failure, send control signal.
The present invention provides path to select by baseband processor and the antenna handover information is finished the switching of communication system under different antennae, makes portable terminal can use many antennas to cover a plurality of radio bands.
On the one hand from aerial angle: the different frequency range antenna can adopt independently radio frequency matching circuit, guarantees the optimum Match performance of each antenna; Can make the antenna of the antenna of different frequency range, the flexibility that improves Antenna Design according to the requirement employing different structure form of structural member; The design of antenna need not to evade the distance problem of antenna and hardware, but makes full use of hardware in the portable terminal as the part of antenna or antenna, satisfies the ultra-thin of portable terminal, miniaturization Design.
On the other hand from communication link quality: the communication effect that the mode that adopts many antennas to switch, portable terminal can also the implementation space diversity receptions, realize the seamless switching of frequency satisfying the switching and the roaming of communication system, improve the communications of Mobile Terminals quality.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram of the antenna equipment of prior art;
Fig. 2 is the block diagram according to the portable terminal of the embodiment of the invention;
Fig. 3 is the particular hardware enforcement figure of 3G portable terminal according to the embodiment of the invention shown in Figure 2;
Fig. 4 is the particular hardware enforcement figure of the compatible portable terminal of 2G/3G according to the embodiment of the invention shown in Figure 2;
Fig. 5 is the flow chart according to the frequency band switching method of the portable terminal of the embodiment of the invention;
Fig. 6 is the flow chart according to the frequency band switching method of the portable terminal of the embodiment of the invention;
Fig. 7 is the baseband processor control signal enforcement figure according to the portable terminal of the embodiment of the invention;
Fig. 8 is the flow chart according to the frequency band switching method of the portable terminal of the embodiment of the invention;
Fig. 9 is the flow chart that carries out frequency band search and switching according to the portable terminal of the embodiment of the invention;
Figure 10 A and Figure 10 B are the structural representations according to the portable terminal of the embodiment of the invention;
Figure 11 A and Figure 11 B are the structural representations according to the microstrip antenna of the portable terminal of the embodiment of the invention;
Figure 12 is the 900MHZ antenna return loss performance map that realizes according to the structural member of the embodiment of the invention;
Figure 13 is the 1800MHz antenna return loss performance map that realizes according to the structural member of the embodiment of the invention;
Figure 14 is the 2100MHz antenna return loss performance map that realizes according to the structural member of the embodiment of the invention; And
Figure 15 is the antenna return loss performance map of prior art.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Fig. 2 is the block diagram according to the portable terminal 200 of the embodiment of the invention.
With reference to Fig. 2, portable terminal 200 comprises: the antenna of many different frequency ranges, and first antenna 2022, second antenna 2024, third antenna 2026 are used to carry out the transmitting-receiving of signal; A plurality of radio frequency paths, first radio frequency path 2042, second radio frequency path 2044, the 3rd radio frequency path 2046, first radio frequency path 2042 is connected with first antenna 2022, and second radio frequency path 2044 is connected with second antenna 2024, and the 3rd radio frequency path 2046 is connected with third antenna 2026; And baseband processor 206, be connected with first radio frequency path 2042, second radio frequency path 2044, the 3rd radio frequency path 2046, be used for after receiving a control signal, control radio frequency path (such as the first radio frequency path 2042) antenna (such as first radio frequency path corresponding first antenna 2022) corresponding with radio frequency path carries out the transmitting-receiving of signal.
In Fig. 2, solid line represents it is base-band data signal, and baseband processor 206 output individual channel IO base-band data signals are to radio frequency path, and dotted line represents it is the base band control signal, the work of control radio frequency path.
In addition, portable terminal can also be arranged on baseband processor between a plurality of radio frequency paths and the many antennas, and baseband processor is sent the base band control signal according to switching signal, being connected of control radio frequency path and radio frequency path respective antenna, and carry out the transmitting-receiving of signal or data.
Fig. 3 is the particular hardware enforcement figure of 3G portable terminal according to the embodiment of the invention shown in Figure 2.
With reference to Fig. 3, portable terminal 200 also comprises mixer 2082,2084,2086, is arranged between the transmission and reception path of antenna and radio frequency path, is used for when the UMTS/CDMA standard, and signal reception path and transmission path are closed the road.
The reception path of the first radio frequency path 2042UMTS900 and transmission path are by mixer 2082 shared 900MHz antennas 2022, the reception path of the second radio frequency path 2044UMTS1700 and transmission path pass through mixer 2086 shared 2100MHz antennas 2026 by reception path and the transmission path of mixer 2084 shared 1700MHz antenna 2024, the three radio frequency path 2046UMTS210000.
During UMTS900 work, baseband circuit provides the base band control signal, makes the UMTS900 radio frequency path connect the communication function that 900MHz antenna 2022 is realized UMTS900, and the communication of other paths realizes by that analogy.The realization of three antennas 2022,2024,2026 can be adopted identical structure, also can adopt different structures, for example, the 900MHz antenna can adopt built-in PIFA antenna, and the 1700MHz antenna can adopt unipole antenna and 2100MHz antenna can adopt microstrip antenna.
Fig. 4 is the particular hardware enforcement figure of the compatible portable terminal of 2G/3G according to the embodiment of the invention shown in Figure 2.
With reference to Fig. 4, portable terminal 200 can also comprise two multiplex switch, multiplex switch 4022 and antenna 2022 corresponding connections, multiplex switch 4024 and antenna 2024 corresponding connections, each multiplex switch also is connected with a plurality of radio frequency paths of near frequency band respectively, makes a plurality of radio frequency paths of near frequency band can correspond to an antenna.Can be according to controlling a radio frequency path by the base band control signal that baseband processor produced by carrying out the transmitting-receiving of signal with multiplex switch and corresponding antenna.
Only provided the embodiment of two multiplex switch among Fig. 4, but the not restriction of the quantity of multiplex switch, can be more than two.In general, the frequency range that is used for portable terminal generally can be divided into three kinds, and is a kind of near 900MHz, a kind of near 1700MHz, and at last a kind of is 2100MHz, so need three multiplex switch usually.
Portable terminal 200 also can comprise time division multiplexing switch (not shown), is used for when the GSM/TD-SCDMA standard, carries out the time-division transmitting-receiving and switches, and is about to receive path and the antenna of launching the corresponding connection of path time division multiplexing.In addition, the multiplex switch that can the GSM/TD-SCDMA radio frequency path connects is set to possess simultaneously the function of time division multiplexing switch and the multiplex switch that is used to switch.
With reference to Fig. 4, the reception path of UMTS900 is connected multiplexing 900MHz antenna 2022 with the emission path with multiplex switch 4022 by mixer 2082; Same, the reception path of GSM900 and transmission path are by identical multiplex switch 4022 multiplexing 900MHz antennas 2022.
The reception path of UMTS1700 is connected with multiplex switch 4024 by mixer 2084 with transmission path, multiplexing 1700MHz antenna 2024; Same, DCS1800, the reception path of PCS1900 and transmission path are by identical multiplex switch 4024 multiplexing 1700MHz antennas 2024;
The reception path of UMTS2100 and transmission path use 2100MHz antenna 2026 by mixer 2086.
When GSM900 needed work, baseband circuit provided the base band control signal, made GSM900 receive path and was connected 900MHz antenna 2022 with the GSM900 transmission path by 4042 time-divisions of multiplex switch ground, realized the communication function of GSM900; The concrete communication of other paths realizes not repeating them here.
Wherein the base band control signal is mainly used in control radio frequency path and respective antenna work, therefore:
Portable terminal in the embodiment of the invention does not have multiplex switch, only have under the situation of radio frequency path and antenna, under the situation that baseband processor only is arranged on radio frequency path is connected, be connected owing to radio frequency path and with respective antenna, the base band control signal can only comprise radio frequency path and select information, just can determine radio frequency path and respective antenna; When baseband processor was arranged on situation between radio frequency path and the antenna, the base band control signal need comprise that radio frequency path selects information and day line options information, thereby determines radio frequency path and respective antenna.
, and comprise under the situation of multiplex switch that the base band control signal can directly comprise radio frequency path selection information equally in a plurality of standards of the mobile terminal design of embodiments of the invention, or directly comprise radio frequency path selection information and day line options information; In the specific implementation of another execution mode, also can allow the base band control signal comprise Frequency Band Selection information and standard selection information, thereby obtain radio frequency path and corresponding multiplex switch and antenna.
In addition, relate to the GSM/TD-SCDMA standard, time-division system transmitting-receiving handover information etc. are also in the base band control signal.
The realization of three antennas 2022,2024,2026 of embodiment of the invention portable terminal can be adopted identical structure, also can adopt different structures, for example, the 900MHz antenna can adopt built-in PIFA antenna, and the 1700MHz antenna can adopt unipole antenna and 2100MHz antenna can adopt microstrip antenna.
And, one or more antenna of embodiment of the invention portable terminal, perhaps the part of antenna can be made of the hardware of portable terminal.
Structural member is generally framework, support, rotating shaft or the housing of portable terminal; Hardware refers to by the structural member that is made of metal fully or part is made of metal: such as metal frame, metallic support, and metal rotating shaft or metal shell; Perhaps by the structural member of electroplating, the non-metallic material of spraying constitutes: the plastic frame of plated metal, the plastic stent of plated metal, be coated with the rotating shaft of metal or be coated with the plastic housing of metal coating.Except using a hardware as one or more antenna, can also be by the antenna that constitutes of a plurality of hardwares.
Owing in wireless communication procedure,, also can switch in different frequency ranges because the complexity of network environment not only will be switched on standard so communicate by letter.Antenna seamless switching during the design of employing spaced antenna also needs to realize communicating by letter.According to the implementation method of the embodiment of the invention as shown in Figure 5.In addition, this switching can also be used to realizing the roaming switching.
Fig. 5 is the flow chart according to the portable terminal frequency band switching method of further embodiment of this invention.
With reference to Fig. 5, comprise according to the frequency band switching method of further embodiment of this invention:
Step S502, Base-Band Processing electrical equipment receives a control signal, and control signal is used for controlling a radio frequency path of a plurality of radio frequency paths; And
Step S504, baseband processor is controlled a radio frequency path based on control signal and is reached an antenna job corresponding with radio frequency path in many antennas.
Fig. 6 is the flow chart according to the frequency band switching method of the portable terminal of the embodiment of the invention, specifically, is the frequency range switching flow figure in startup and search network process of 3G portable terminal.
With reference to Fig. 6, the frequency band switching method of the embodiment of the invention may further comprise the steps:
Step S602, the 3G portable terminal starts, need carry out web search, after baseband processor receives instruction, obtain coding schedule, first is encoded to 1000, baseband processor is according to coding gating UMTS900 radio frequency path and 900MHz antenna, carry out web search, base station network is if replying portable terminal inserts successfully, and system adopts UMTS900 and the work of 900MHz antenna; If there is not the base station to reply, wait for that promptly the base station answer is overtime, then execution in step S604;
Step S604, reply when overtime when waiting for the base station, obtain the radio frequency path switching command, read next coding, be encoded to 1001, baseband processor gating UMTS1700 and 1700MHz antenna carry out web search, if base station network is replied portable terminal and inserted successfully, system adopts UMTS1700 and the work of 1700MHz antenna; If there is not the base station to reply, wait for that promptly the base station answer is overtime, then execution in step S606;
Step S606, reply when overtime when waiting for the base station, obtain the radio frequency path switching command, read next coding, be encoded to 1xxx, baseband processor gating UMTS2100 radio circuit and 2100MHz antenna carry out web search, if base station network is replied portable terminal and inserted successfully, system adopts UMTS2100 and the work of 2100MHz antenna; If there is not the base station to reply, wait for that promptly the base station answer is overtime, then execution in step S608; And
Step S608, the system prompt current environment does not have available network.
Fig. 7 is the baseband processor control signal enforcement figure according to the portable terminal of the embodiment of the invention.
With reference to Fig. 7,4 GPIO of baseband processor provide 4 control signal bit4 to bit1, and 4 control signals can be controlled the switching of 16 road paths.Wherein, highest order bit4 is that standard is selected signal, and when bit4 was high level, terminal adopted the work of 3G standard, and bit4 adopts the work of 2G/2.5G standard, this signal controlling multiplex switch 4022, multiplex switch 4024 and UMTS2100 radio frequency path during for low level; Bit3 is as the time-division transceiving switch-over control signal of GSM/DCS/PCS, and control multiplex switch 4022, multiplex switch 4024 make the reception path of GSM/DCS/PCS be connected with antenna with emission path time division multiplexing ground, finish the requirement of system's time-division communication; Bit2 is as the switching signal of 1800/1900MHz, connection multiplexing switch 4024; Bit1 is as the switching signal of 850/900MHz, connection multiplexing switch 4022; Bit1, bit2 signal also pass through or logic, NAND Logic forms antenna selection signals, bit1, be connected to the Enable Pin of multiplex switch 4022 after bit2 or the logic, be connected to the Enable Pin of multiplex switch 4024 after the NAND Logic, realize day line options control: as bit1, when the bit2 signal is 11 or 00, logic sum gate output is high, multiplex switch 4022 enables, select antenna 2022 work, the output of logical AND not gate is low, and multiplex switch 4024 is forbidden, antenna 2024 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet; Work as bit1, the bit2 signal is 01 or 10 o'clock, and the output of logical AND not gate is high, multiplex switch 4024 enables, and selects antenna 2024 work, and logic sum gate output is low, multiplex switch 4022 forbids that antenna 2022 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet; When bit1, bit2 were high-impedance state, multiplex switch 4022,4024 forbade that all antenna 4042,4044 is all not selected, and the work of UMTS2100 radio frequency path is selected by system, and antenna 2026 is selected.
The logic of switch-over control signal table is as shown in table 1:
Table 1
Above-mentioned switch-over control signal table 1 is stored in the flash of the system assigned address, and system is in handoff procedure, and is tactful in a certain order, read the value of switch-over control signal table, by selecting communication standard, multiplex switch and antenna, the radio frequency path switching of realization system under a plurality of antennas.
In order to realize uniqueness control, shown in the switching controls table, the control information of each path is encoded to radio frequency path and day line options.That is:
0000, select radio-frequency channel GSM850RX (multiplex switch 4022) and antenna 2022;
0011, select radio-frequency channel GSM900RX (multiplex switch 4022) and antenna 2022;
0100, select radio-frequency channel GSM850TX (multiplex switch 4022) and antenna 2022;
0111, select radio-frequency channel GSM900TX (multiplex switch 4022) and antenna 2022;
1000, select radio-frequency channel UMTS900 (multiplex switch 4022) and antenna 2022;
0001, select radio-frequency channel DCS1800RX (multiplex switch 4024) and antenna 2024;
0010, select radio-frequency channel PCS1900RX (multiplex switch 4024) and antenna 2024;
0101, select radio-frequency channel DCS1800TX (multiplex switch 4024) and antenna 2024;
0110, select radio-frequency channel PCS1900TX (multiplex switch 4024) and antenna 2024;
1001, select radio-frequency channel UMTS1700 (multiplex switch 4024) and antenna 2024; And 1XXX, select radio-frequency channel UMTS2100 (antenna 2026).
Above uniqueness coding has been arranged, i.e. baseband processor output specific coding signal just can be selected and specify radio frequency path and antenna, and portable terminal just can be realized standard, the switching of frequency range and antenna by exporting different codings.
The strategy that switches has two kinds, and a kind of is that portable terminal automaticallyes switch, and also having a kind of is the mobile phone users manual switchover.The strategy that automaticallyes switch can be formulated the transfer sequence table in advance according to the situation and the portable terminal self-condition of real network, be that portable terminal connects which frequency range of which kind of standard earlier, switch to which frequency range of which standard again, portable terminal is stored in this switchover policy sequence list in the flash position of portable terminal appointment, reads this sequence valve and implement to switch in handoff procedure.
Manual switchover then is the requirement according to people, and the artificially selects standard or frequency range to communicate.Following chart 2 is portable terminals according to first China U.S. again, and first 3G is 2G again, and first low frequency is the transfer sequence table formulated of the full system type pictorial of high frequency/full frequency band switchover policy again.Transfer sequence is 1 → 2 → 3 → 4 → 5 → 6 → 7 → 1.
Table 2:
Fig. 8 is according to the flow chart of the frequency band switching method of the portable terminal of the embodiment of the invention.Be applicable to portable terminal at search network, roaming is switched, the switching flow in the processes such as manual switchover.
With reference to Fig. 8, the switching of portable terminal frequency range comprises following steps:
Step S802: obtain handoff trigger signal, carry out step S804;
Step S804: according to handoff trigger signal, obtain the transfer sequence table, carry out step S806;
Step S806: baseband processor is determined target standard and target frequency bands according to the transfer sequence table, makes the target radio frequency closed-circuit working according to target standard and target frequency bands, carries out step S808; And
Step S808: baseband processor sends the gating signal with target standard and target frequency bands to the multiplex switch of target standard and target frequency bands correspondence; Multiplex switch is selected corresponding antenna according to target standard and target frequency bands, makes the target radio frequency path carry out signal transmitting and receiving by target antenna.
Need to prove, the selection of radio frequency path, the selection of multiplex switch, the selection of antenna and the requirement of out-of-order can be carried out in any order or simultaneously.
Fig. 9 is the flow chart that carries out frequency band search and switching according to the portable terminal of the embodiment of the invention, specifically, be the flow chart that carries out multi-modulation scheme multiband search network process according to embodiment of the invention 2G/3G portable terminal at start process according to the transfer sequence of table 2.
With reference to Fig. 9, portable terminal may further comprise the steps according to the process that the transfer sequence of table 2 carries out the search network of full system type pictorial full frequency band at start process:
Step S902, the 2G/3G portable terminal starts, need carry out web search, after baseband processor receives instruction, read the transfer sequence table of mobile terminal stores assigned address in flash, obtain first state value, be set to 1 according to the first state value bit4, communication system is operated under the 3G pattern, further bit1 to bit3 is set to high resistant xxx, thereby the base band control signal of output 1xxx, this signal gating UMTS2100 radio frequency path and antenna 2026, multiplex switch 4022,4024 is forbidden, antenna 2022,2024 is not selected.Portable terminal adopts the UMTS2100 frequency range, sends to the base station by antenna 2026 and inserts signal, if replying portable terminal in this frequency range, the base station inserts, and the success of portable terminal access base station, portable terminal adopts UMTS2100 to communicate by antenna 2026 and base station.If does not reply the base station, portable terminal is at this frequency band search network failure of this standard, then execution in step S904;
Step S904, baseband processor reads the transfer sequence table, reads second state value, is set to 0 according to the second state value bit4, communication system is operated under the 2G/2.5G pattern, further bit3 to bit1 is set to 011 and 111, thereby makes the base band control signal switch between 0011 and 0111, this a pair of signal enables multiplex switch 4022, terminal is selected antenna 2022, multiplex switch 4024 forbids that antenna 2024 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet.This a pair of signal is also controlled the reception of multiplex switch 4022 gating GSM900 radio frequency paths and is connected antenna 2022 with sending the time-division, portable terminal adopts the GSM900 frequency range, send the access signal by antenna 2022 to the base station, if the base station is replied terminal in this frequency range and is inserted, base station access by terminal success, terminal adopt GSM900 to communicate by antenna 2022 and base station.If does not reply the base station, terminal is at this frequency band search network failure of this standard, then execution in step S906;
Step S906, baseband processor reads the transfer sequence table, reads third state value, and bit4 is set to 0 according to third state value, communication system is operated under the 2G/2.5G pattern, further bit3 to bit1 is set to 001 and 101, thereby makes the base band control signal switch between 0001 and 0101, this enables multiplex switch 4024 to signal, system selectes antenna 2024, multiplex switch 4022 forbids that antenna 2022 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet.The reception of these a pair of signal controlling multiplex switch 4024 gating DCS1800 radio frequency paths is connected antenna 2024 with transmission time-division ground, terminal adopts the DCS1800 frequency range, send the access signal by antenna 2024 to the base station, if the base station is replied terminal in this frequency range and is inserted, base station access by terminal success, terminal adopt DCS1800 to communicate by antenna 2024 and base station.If does not reply the base station, terminal is at this frequency band search network failure of this standard, then execution in step S908;
Step S908, baseband processor reads the transfer sequence table, reads the four condition value, and bit4 is set to 1 according to the four condition value, and system works is under the 3G system; Further bit3 to bit1 is set to 000, thereby makes baseband processor export 1000 signals, this signal enables multiplex switch 4022, selected antenna 2022, multiplex switch 4024 forbids that antenna 2024 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet.This signal is also controlled multiplex switch 2022 the UMTS900 radio frequency path is connected on the antenna 2022, terminal inserts signal to base station, search UMTS900 frequency range, if terminal is replied in the base station, the success of terminal searching network, then terminal works is in the UMTS900 frequency range, communicate by antenna 2022 and base station, if does not reply the base station, then do not search network, execution in step S910 in this frequency range;
Step S912, baseband processor reads the transfer sequence table, reads the 6th state value, according to the 6th state value bit4 is changed to 0, communication system is operated under the 2G/2.5G pattern, further bit3 to bit1 is set to 000 and 100, thereby makes the base band control signal switch between 0000 and 0100, this enables multiplex switch 4022 to signal, select antenna 2022, forbid multiplex switch 4024, antenna 2024 is not selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet.This also is connected antenna 2022 by the reception of multiplex switch 4022 control terminal GSM850 radio frequency paths with transmission time-division ground to signal, terminal adopts GSM850 to send to the base station and inserts signal, search GSM850 frequency range, if then search network success of terminal is replied in the base station, terminal adopts GSM850 to communicate by antenna 2022 and base station.If does not reply the base station, terminal is at this frequency band search network failure of this standard, then execution in step S914;
Step S914, baseband processor reads the transfer sequence table, reads the 7th state value, according to the 7th state value bit4 is changed to 0, communication system is operated under the 2G/2.5G pattern, further bit3 to bit1 is set to 010 and 110, thereby makes the base band control signal switch between 0010 and 0110, this enables multiplex switch 2024 to signal, terminal is selected antenna 2024, forbid multiplex switch 4022, antenna 2022 does not have selected, and UMTS2100 radio frequency path and antenna 2026 are not selected yet.This reception of signal also being passed through the PCS1900 of multiplex switch 4024 control terminals is connected antenna 2024 with transmission time-division ground, send the access signal to the base station, search PCS1900 frequency range, if then search network success of terminal is replied in the base station, terminal adopts the PCS1900 frequency range to communicate by antenna 2024 and base station, if does not reply the base station, terminal is at this frequency band search network failure of this standard, promptly all frequency ranges of all standards all do not search, and inform that then the user does not have network.
Standard in the above starting up of terminal search network and frequency range handoff procedure only are the embodiment that terminal antenna switches, but are not limited to this.Provide the several exemplary embodiments that produce switching condition in the portable terminal use below again:
The neighbor base station cell status of intercepting in the communication process is in like manner realized with the start search network, the order of intercepting is relevant according to the situation and the terminal current state of the standard frequency range of country, the network that adopts Netcom in China such as terminal then encoding state has three: the first state UMTS2100, the second state GSM900, third state DCS1800, state variation order 1 → 2 → 3 → 1.Communicate as current employing GSM900, be in second order status, control is encoded to 0011,0111, then terminal is intercepted neighbor base station cell signal state next step is switched to the 3rd order status, base band control is encoded to 0001 and 0101, and terminal is intercepted DCS1800 base station signal state and record, as the foundation of roaming switching; Next step then switches to first order status again, and base band control encoding setting is 1xxx, intercepts the signal condition of UMTS2100 neighbor base station and the foundation that record switches as roaming.
The roaming switching also can realize by changing the switching of control signal coding control antenna, just switchover policy is determined frequency range and standard switching by the base station according to network condition, as: terminal adopts UMTS900 and base station communication at present, control signal is encoded to 1000, when if communication link detection module detection this moment communication link quality does not satisfy the demands, promptly normal talking or transfer of data can't be carried out, a detection signal can be produced.If the frequency range of known other base stations such as UMTS1700 and portable terminal link-quality are fine, base station notice terminal switches to UMTS1700, promptly send switching command to terminal, base band control coding output 1001, this signal is selected antenna 2024, and the UMTS1700 radio frequency path is connected to antenna, realize that terminal and base station employing UMTS1700 communicates by letter, perhaps ought not know under the UMTS1700 radio frequency path link quality condition in advance, terminal is according to the transfer sequence table, switch back communication link detection module and communicate the link-quality detection again,, can continue again to switch if can't satisfy the demands.
Same user manually also can realize the switching of antenna, only wishes to adopt the 2G network of China Mobile as the user, and terminal only adopts the communication of GSM900 frequency range, control then manually is set is encoded to 0011,0111.Promptly in terminal man-machine interface is set, the 2G of China Mobile network is manually selected this option, and switching command manually is set, and after baseband processor read the switching command of manual setting, it was 0011,0111 that base band is controlled encoding setting.This control signal is selected antenna 2022, and the reception of GSM900 radio frequency path is linked to each other with antenna 2022 with emission timesharing ground, and the realization terminal is communicated by letter with the 2G of China Mobile network.
In a word, the switched design that adopts a plurality of antennas to cover portable terminal multiband and a plurality of antennas can satisfy the requirement that the various standard frequency ranges of communication system are switched, search network and intercept switchover policy and can determine by terminal, the roaming strategy can be accepted base station information by terminal and formulate, network can also manually be set, fixing a certain antenna communication.
Figure 10 A and Figure 10 B are the structural representations according to the portable terminal of the embodiment of the invention;
Shown in Figure 10 A and 10B, portable terminal 1000 back sides are plastic housing 1002, and the upside of broadside downside has a strip metal frame 1004 and interior metal support (not shown), and the long side face has two metal rotating shaft 1006.
In the present embodiment, GSM900, promptly the 900MHz antenna adopts PIFA antenna 8022: metal spraying belongs to coating in the plastic housing 1002 at portable terminal 1000 back sides, links to each other with circuit board by the POGO connected mode.Structural member only requires to realize single-frequency 900MHz antenna, the radiance that promptly satisfies the 880MHz～960MHz frequency range of GSM900 and UMTS900 frequency range requirement gets final product, the requirement of radiant body area and volume is all little, metal coating area requirements 20mm*45mm, height 5mm just can access radiation characteristic preferably, the floor file on this radiant body and the wiring board or the ground of radome form resonance, realize the radiation function of antenna.As the return loss performance figure of Figure 12 for the antenna of realization.
The upside of broadside downside is electroplate with the unipole antenna of a strip metal frame 1004 as 1800/1900MHz at plastic frame, and the length of metal frame 1004 is quarter-waves of frequency range: 42mm.As long as this metal edge frame satisfies the requirement of DCS1800/UMTS1700 at 1710MHz～1910MHz, as the return loss performance figure of Figure 13 for the antenna of realization, these portable terminal 1000 complete machine width are 56mm, reserve 14mm and meet structural requirement as renovating axle.
At the long side face two metal rotating shaft 1006 are arranged, the line of upper and lower covers passes connection by one in two metal rotating shaft 1006 at present, and another metal rotating shaft is not used at present, therefore can be with its antenna as the 2100MHz signal.
Figure 11 A and Figure 11 B are the structural representations according to the microstrip antenna of the portable terminal of the embodiment of the invention.
Shown in Figure 11 A and Figure 11 B, the center of microstrip antenna 900 is a metal rotating shaft, central metal rotating shaft ground connection, and the surface is medium between surperficial microstrip circuit and the central rotating shaft around microstrip circuit.Microstrip circuit, medium, and central metal rotating shaft formation antenna, antenna surface is sprayed paint.H=2.5mm among the figure, W=2mm, ε
r=4.5, and L=λ
g/ 4=20mm.As long as this microstrip antenna satisfies UMTS2100 at 1920MHz～1980MHz, the performance requirement of 2110～2170MHz gets final product, as the return loss performance figure of Figure 14 for the antenna of this structural member realization.
Antenna size in the antenna integrated design in the prior art scheme shown in Figure 1 is generally 28.5*45.5*6.8mm, bigger than spray antenna volume 20*45*5mm in the embodiments of the invention on structural member, the performance of the return loss that antenna is realized as shown in figure 15.Contrast Figure 15 and Figure 12, Figure 13 and Figure 14 as can be seen, good than shown in Figure 15 of the antenna overall performance shown in Figure 12, Figure 13, Figure 14.Antenna integrated performance shown in Figure 15 is in EGSM900/UMTS900 and two frequency ranges of DCS1800/UMTS1700, the performance that is 880MHz～960MHz and 1710MHz～1880MHz also meets the demands substantially, return loss can satisfy substantially-below the 4.5dB, but in PCS1900 and two frequency ranges of UMTS2100MHz, the return loss that is 1780MHz～1920MHz and 1910MHz～2170MHz has only-4～-2dB about, performance can't guarantee.As seen Antenna of small dimensions is difficult to satisfy radio communication full range band performance requirement.And this programme adopts the antenna covering full frequency band of a plurality of frequency ranges can satisfy system requirements.
By the foregoing description, the present invention provides path to select by baseband processor and the antenna handover information is finished the switching of communication system under different antennae, makes portable terminal can adopt many antennas to cover the design of communication multiband.
On the one hand from aerial angle: the different frequency range antenna can adopt independently radio frequency matching circuit, guarantees the optimum Match performance of each antenna; Can make the distance between the antenna of different frequency range become far away, improve the isolation between the different frequency range antenna, avoid the coupling between the different frequency range antenna, be convenient to improve radiation efficiency; Adopt the antenna of many different frequency ranges to cover the whole wireless communication frequency band of portable terminal, the bandwidth number that single antenna is required is few, and structural member is realized easily; The antenna of different frequency range can be according to the antenna of structural member different mining with different structure, the flexibility that improves Antenna Design; The design of last antenna need not to evade the distance problem of antenna and hardware, but can make full use of hardware in the portable terminal as the part of antenna or antenna, satisfies the ultra-thin of portable terminal, miniaturization Design.
On the other hand from communication link quality: the mode that adopts many antennas to switch, portable terminal can also the implementation space diversity reception the communication effect, a little less than some aerial signals, under the situation of communication quality difference, portable terminal can initiatively switch on the another one antenna, has directly improved the link-quality of communication; Many Antenna Design seamless switching of can also realizing communicating by letter at different frequency range, a little less than some frequency band signals, under the situation of communication quality difference, portable terminal can initiatively switch to another communications band, satisfy the switching and the roaming of communication system, improve the communications of Mobile Terminals quality.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (15)
1. a portable terminal is characterized in that, comprising:
The antenna of many different frequency ranges, described antenna are used to carry out the reception and the transmission of signal;
A plurality of radio frequency paths, each radio frequency path in described a plurality of radio frequency paths is corresponding with a antenna in the antenna of described many different frequency ranges; And
Baseband processor, be connected with each radio frequency path in described a plurality of radio frequency paths, be used to obtain a control signal, described control signal is used for controlling first radio frequency path of described a plurality of radio frequency paths, and controls described first radio frequency path and the first antenna work corresponding with described first radio frequency path in described many antennas based on described control signal.
2. portable terminal according to claim 1 is characterized in that, also comprises:
A plurality of multiplex switch, each multiplex switch in the described multiplex switch is corresponding with a antenna in the antenna of described many different frequency ranges, be used for a plurality of radio frequency paths of the near frequency band of described a plurality of radio frequency paths are corresponded to a described antenna, and according to second radio frequency path in a plurality of radio frequency paths of controlling described near frequency band by described control signal and the second antenna work corresponding with described second radio frequency path in described many antennas.
3. portable terminal according to claim 1, it is characterized in that, described baseband processor also is used to send the base band control signal to control described first radio frequency path and the described first antenna work, and wherein said base band control signal comprises: first radio frequency path is selected information.
4. portable terminal according to claim 3 is characterized in that, described base band control signal also comprises: first day line options information.
5. portable terminal according to claim 2 is characterized in that, described base band control signal comprises: the first Frequency Band Selection information and first standard are selected information.
6. portable terminal according to claim 1 is characterized in that, one or more in the antenna of described many different frequency ranges is to be that the structural member of metal or its constitute by described portable terminal to small part.
7. portable terminal according to claim 1 is characterized in that, described portable terminal also comprises:
The time-sharing multiplex switch is used for when the GSM/TD-SCDMA standard, and one of the antenna of selecting described many different frequency ranges is as receiving the time division multiplexing antenna of path with the emission path, and carries out the switching of described signal time-division transmitting-receiving.
8. portable terminal according to claim 1 is characterized in that, described portable terminal also comprises:
Mixer is arranged between transmission, reception path and the antenna of described radio frequency path, is used for when the UMTS/CDMA standard described reception path and described transmission path being closed the road.
9. the frequency band switching method of a portable terminal, described portable terminal comprises:
The antenna of many different frequency ranges, described antenna are used to carry out the reception and the transmission of signal;
A plurality of radio frequency paths, each radio frequency path in described a plurality of radio frequency paths is corresponding with a antenna in the antenna of described many different frequency ranges; And
Baseband processor is connected with each radio frequency path in described a plurality of radio frequency paths;
It is characterized in that described frequency band switching method comprises:
Receive a control signal, described control signal is used for controlling first radio frequency path of described a plurality of radio frequency paths;
Control described first radio frequency path based on described control signal and carry out the reception and the transmission of signal by first corresponding in the described many antennas antenna with described first radio frequency path.
10. frequency band switching method according to claim 9 is characterized in that, before described reception one control signal, also comprises step:
Automatically detect described mobile terminal state and whether satisfy switching condition,, send described control signal if satisfy switching condition.
11. frequency band switching method according to claim 10 is characterized in that, described switching condition is specially:
The effect of can't working radio frequency path or work does not satisfy predetermined demand.
12. frequency band switching method according to claim 9 is characterized in that, before described reception one control signal, also comprises step:
Receive user's switching command, send described control signal.
13. frequency band switching method according to claim 9 is characterized in that, described first radio frequency path of described control and in described many antennas the first antenna work corresponding with described first radio frequency path be specially:
Obtain the transfer sequence table, described transfer sequence table comprises first radio frequency path selection information;
Obtain described first radio frequency path and select information, described first radio frequency path is selected corresponding first radio frequency path of information;
Send the base band control signal;
Determine described first radio frequency path;
Determine first antenna of the described first radio frequency path correspondence;
Described first radio frequency path carries out the reception and the transmission of signal by described first antenna.
14. frequency band switching method according to claim 9 is characterized in that, described portable terminal also comprises:
A plurality of multiplex switch, each multiplex switch in the described multiplex switch is corresponding with a antenna in the antenna of described many different frequency ranges, be used for a plurality of radio frequency paths of the near frequency band of described a plurality of radio frequency paths are corresponded to a described antenna, and according to second radio frequency path in a plurality of radio frequency paths of controlling described near frequency band by described control signal and the second antenna work corresponding with described second radio frequency path in described many antennas;
Described first radio frequency path of described control and in described many antennas the first antenna work corresponding with described first radio frequency path be specially:
Obtain the transfer sequence table, described transfer sequence table comprises the first Frequency Band Selection information and first standard selection information;
Obtain described first Frequency Band Selection information and described first standard and select information;
Send the base band control signal, described base band control signal comprises described first Frequency Band Selection information and described first standard selection information;
Determine first radio frequency path according to described first Frequency Band Selection information and the described first standard selection information;
Believe that according to described first frequency range then information and the described first standard selection information are determined first multiplex switch, and determine first antenna that is connected with described first multiplex switch;
Described first radio frequency path carries out the reception and the transmission of signal by described first antenna.
15. frequency band switching method according to claim 9, it is characterized in that, described control based on described control signal described first radio frequency path by described many antennas in first antenna corresponding with described first radio frequency path carry out the reception of signal and send after also comprise step:
When the acceptance of described signal with when sending failure, send described control signal.
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|---|---|---|---|
| CN200910078290A CN101814924A (en) | 2009-02-24 | 2009-02-24 | Mobile terminal and method for switching frequency bands |
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|---|---|---|---|
| CN200910078290A CN101814924A (en) | 2009-02-24 | 2009-02-24 | Mobile terminal and method for switching frequency bands |
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| CN101814924A true CN101814924A (en) | 2010-08-25 |
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| CN200910078290A Pending CN101814924A (en) | 2009-02-24 | 2009-02-24 | Mobile terminal and method for switching frequency bands |
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Application publication date: 20100825 |