CN1905708B - High-speed switching base station searching method and mobile communication terminal thereof - Google Patents
High-speed switching base station searching method and mobile communication terminal thereof Download PDFInfo
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- CN1905708B CN1905708B CN2005100876331A CN200510087633A CN1905708B CN 1905708 B CN1905708 B CN 1905708B CN 2005100876331 A CN2005100876331 A CN 2005100876331A CN 200510087633 A CN200510087633 A CN 200510087633A CN 1905708 B CN1905708 B CN 1905708B
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Abstract
The invention discloses a method for searching base-stations during the high-speed switching of the mobile communication terminals, which is applicable for the two-way mobile communication terminals to simultaneously receive and transmit signals. When the mobile terminal holds the phone in the first channel with a station, all the other time-slots search the available stations continuously in order to rapidly detect the stations at the same time, except the current time-slot of dialogue in the second channel.
Description
Technical field
The present invention relates to mobile communication system, particularly a kind of mobile communication terminal in high-speed switching process base station search method and realize the mobile communication terminal of this method.
Background technology
Switching claims seamless switching (seamless handover) again at a high speed, is a key technology that improves the radio communication speech quality.Referring to shown in Figure 1, portable terminal among the figure just communicates by base station 1 (CS1), and when this portable terminal moved to the edge of base station 1 coverage, the field intensity of wireless signal descended, degraded signal quality, portable terminal must switch to other signals base station (as the base station among the figure 2) preferably.Switch and to comprise common switching and switch at a high speed, common switching is meant after the communicating by letter of the terminating mobile terminal that will switch and current base station (base station 1 of Fig. 1) that (the also respective interrupt of conversing) searches for again and recovers to converse after new Traffic Channel is set up in all available new base stations (base station 2 among Fig. 1, base station 4, base station 5) and the new base station (base station 2 of Fig. 1) best with one of them signal.Switch at a high speed and be meant that then terminal is keeping unbroken all the available new base stations of searching for simultaneously of existing conversation, with interrupt again after the foundation of new business channel is finished in selected new base station and the communicating by letter of former base station, and switch to new base station continuation and converse.Obviously, the time that Speech Communication interrupts in switching at a high speed is shorter, thereby the user feels that speech quality is higher.Switch in the mobile communication at a high speed and generally adopted.
Adopt the mobile communication system of TDMA mode, its air interface generally adopts the TDMA mode, and the physical layer of this air interface generally is to constitute (system that has also has Hyperframe) by time slot (slot), frame (frame), multi-frame (multi-frame), superframe (super-frame).With the PHS system is example, and Fig. 2 is the data structure schematic diagram of the time slot of this PHS system.A time slot (slot) comprises 240 bits (bit) (0-239).Its concrete implication is as shown in table 1 below.Every frame comprises 8 time slots (4 pairs of transmission/receptions), and 8 time slots can be represented with slot0-slot7 respectively.Slot0-slot3 is used for the transmission (reception of terminal) of base station, and slot4-slot7 is used for the reception (transmission of terminal) of base station.It is right that wherein slot0 and slot4 constitute a transmission/reception, and it is right that slot1 and slot5 constitute a transmission/reception, and the rest may be inferred for other.Certain of 8 time slots is to fixedly time slot is as the control channel (CCH) of communicating control information, and other 3 pairs of time slots are given each user's Traffic Channel (TCH) as Random assignment.The carrier frequency of control channel CCH is fixed.The carrier frequency of Traffic Channel TCH is unfixed, and the carrier frequency of the carrier frequency of Traffic Channel (TCH) and control channel (CCH) is not on same frequency.Usually, a plurality of frames constitute a multi-frame, be used to a plurality of base station assigns control channels (CCH), so the notion of multi-frame only are used for control channel (CCH).A plurality of multi-frames constitute a superframe again.No matter whether there is terminal to communicate by letter, the base station all incessantly according to fixing carrier frequency, be the information that transmits control channel in the cycle with the multi-frame, promptly send the CCH data message.Therefore, in a multi-frame, occur and only occur once,, then ideally can have the control channel of 4 * N base station to be contained in the multi-frame at most if comprise N frame in a multi-frame so for base station CCH data.
Table 1
| Abbreviation | Title | Length | Purposes |
| R | Rising/ | 4 | The adjacent time-slots buffer space is for terminal and base station conducting transmitter |
| SS | | 2 | The frame synchronization code word |
| PR | Lead code | 62/6 | Be used for Phase synchronization |
| UW | Identifier word | 32/16 | One group of specific code word is used for terminal and base station time slot is synchronous, and the indication reception condition |
| CI | | 4 | The kind of indication logic channel |
| I | Information | 104/176 | Signaling or communication data |
| CRC | Cyclic redundancy check (CRC) | 16 | Check bit for useful data error detection generation |
| G | Guard bit | 16 | Prevent the overlapping of adjacent time-slots |
Fig. 3 is frame, the multi-frame structure schematic diagram of PHS system.Fig. 3 has shown CS1, the control channel of CS2 and CS3 (CCH), and they are respectively at the diverse location of a multi-frame.Fig. 3 has also shown the Traffic Channel (TCH) of CS3.It has used the time slot different with the CS3 control channel.
Fig. 4 is a process schematic diagram of setting up flow process with the conversation of new base station.Shown among the figure is the action that terminal (PS) end is adopted, and wherein RX indication PS receives, and TX indication PS sends, and detailed process is:
Stage (1) base station search;
The request and the distribution of stage (2) Traffic Channel;
The foundation of stage (3) Traffic Channel;
Stage (4) voice communication.
Base station search is exactly each base station around the mobile terminal to search, just receives the data of the CCH frame of (carrier frequency is identical) all base stations, if can correctly receive complete CCH frame data, then thinks the base station that has searched this CCH frame data correspondence.This CS search comprises that two stages, process A are to seek all to meet the CS of communication condition, when receiving its CCH frame data, writes down the relevant information that it comprises field intensity, CS identifier (CSID), time etc.; Process B selects the CS of corresponding (is signal the best as the field intensity maximum) then according to these information, and obtains synchronously with this CS.
The request of Traffic Channel and distribution are meant that upward the communication request and the distribution service channel (TCH) of receiving terminal are given terminal at control channel (CCH) in the base station.
The foundation of Traffic Channel is meant in the Traffic Channel after the application (TCH) goes up synchronous foundation and agreement link setup process between base station and the terminal.
Voice communication just can have been talked about enterprising the working of Traffic Channel (TCH) after said process is finished.
In the base station search stage, if PS end without any aerial base station temporal information, need to adopt the mode of continuous operation (continue work, terminal receives on control channel continuously) to carry out work usually; And,, then can take the working method of burst (burst, 5ms transmission/reception once) because terminal has obtained the temporal information of corresponding base station in other stages.
For switching at a high speed, be in the search of carrying out new base station and newly still keep original conversation when TCH sets up with the main distinction of common switching, its flow process is represented with Fig. 5, as can be seen from Figure 5, (1) step was that a road of terminal is being conversed (RX1/TX1 among the figure), and after terminal monitored signal generation deterioration, conversation was continued to keep in this road, another road (RX2/TX2 among the figure) begins to carry out the search and the selection of base station, (2) step as shown; And (2) step, (3) step and (4) goes on foot and general conversation shown in Figure 4 to set up the process of flow process identical.(5) step then was after TCH successfully sets up, and just cut off original conversation, and can forward at once in the communication of new base station.
The realization that former high speed is switched mainly is based on to be carried out under the situation of desirable aerial signal shown in Figure 2, because the channel that supposition is being communicated by letter has obtained the temporal information of aerial signal, so portable terminal is searched for (promptly receiving) operation by the mode that burst receives one by one to other all time slots except the time slot of conversing.
Because in fact available new base station may occur at 6 time slots except that the terminal call time slot, search all base stations and select, and adopts the burst receive mode, terminal will be searched for these 6 time slots one by one.The front is mentioned, and each multi-frame of CCH Frame of base station search just occurs once, and can appear in the multi-frame on arbitrary frame, so each time slot of this method will search for the time of a multi-frame at least, and the time slot of every frame all will receive in the multi-frame.For example, in the PHS system, the cycle of every frame is 5ms, and the cycle of a multi-frame of public network is generally 100ms, and with reference to figure 6, Fig. 6 is the schematic diagram of CCH frame data of each base station of search of prior art.As can be seen from Figure 6, the at first every 5ms of terminal receives time slot 0, receives the time of a multi-frame 100ms at least; Software switches to every 5ms time slot 2 is received then, receives the time of a multi-frame 100ms at least; And the like, 6 time slots are all finished above-mentioned reception operation after, just think the search end of base station.In the actual implementation, owing to consider accidental factors such as signal interference, usually extend to 2～3 times an of multi-frame search time of actual each time slot, and under the situation of not considering the software operation time, the time of finishing all base station searchs is 1～3 times of 6 multiframe periods.
The flow chart of Fig. 7 for adopting burst (burst) receive mode to carry out base station search and selection.Suppose that current what conversing is the channel 1 (channel 1) of terminal, after this channel 1 is monitored to the wireless signal deterioration, beginning starts at a high speed at channel 2 (channel 2) and switches, terminal is in the temporal information of channel 2 replication channels 1, and opening time is synchronous, and working time slot (slot) is set on channel 2 then, and adopts the burst receive mode, set gradually the burst receiving slot of channel 2, the time of each at least one multi-frame of time slot search.Each time slot except that conversation is repeated above-mentioned search.After all time slots are finished, select a best base station CS, and the channel 2 of terminal is synchronized to this base station.So far, base station search and selection finish.
Japanese patent application JP-2000-397776 discloses a kind of method of when switching at a high speed the base station being searched for, it switches to sending time slots by time slot being switched, be about to receiving slot, or sending time slots switched to receiving slot, make before switching to be that the time slot that can not search for becomes the time slot that can search for, enlarged the scope that to search for thus.But the same with above-mentioned general discussion to prior art, its search to the base station remains that time slot one by one carries out, therefore, except enlarging (before this patent was announced, the hunting zone was 3 receiving slots) the hunting zone, it does not have to shorten the search time to the base station.
From top method as can be seen, the method for prior art can realize switching at a high speed the most basic base station search and selection.But there is following shortcoming in this method:
The search time of finishing the base station is longer: adopt said method, will be 1～3 times of 6 multiframe periods the search time of base station, then be 600ms-1800ms in the PHS system, and the typical time requirement of switching at a high speed is 1s-2s.The obvious shared overlong time of search base station;
The hunting zone is still limited, for the bad base station of base station synchronization as shown in Figure 8 (as the CS3 among Fig. 8), though in fact this base station is operable, searches between the time slots because it drops on two, thereby can't correctly be found.
Need the repeatedly switching of software control receiving slot: in order to search all CS, need be by the software switching of Control work time slot one by one.
Summary of the invention
Technical problem to be solved by this invention is in the process of switching at a high speed, can shorten the search time of base station effectively, enlarges the hunting zone, thereby improves the performance of switching at a high speed.
Main technical schemes of the present invention is, portable terminal shortens terminal search time to other base stations (CS) in high-speed switching process by the method that adopts continuous base station (CS) search, enlarge the hunting zone, improve the performance of switching (seamless handover) at a high speed effectively.
For realizing purpose of the present invention, according to an aspect of the present invention, the base station search method of a kind of mobile communication terminal in high-speed switching process is provided, mobile communication terminal is when first channel is keeping conversing with a base station under it is characterized in that, at the every other time slot except that the current time slots of carrying out this conversation available base stations is being searched for continuously on the second channel, to detect the base station that all can switch.
According to another aspect of the present invention, a kind of baseband circuit that comprises also is provided, the mobile communication terminal of radio frequency module and modem, described baseband circuit comprises the channel coding/decoding controller at least, described channel coding/decoding controller comprises the parallel parts of two-way that are used for first channel and second channel: receive and sending module RX1, RX2 and TX1, TX2, the radio frequency control module RFC1 and the RFC2 of control radio frequency module, reception and sending module and radio frequency control module are carried out the time block TMG CH1 and the TMG CH2 of sequencing control, and the interrupt module INT1 and the INT2 that produce interruption, it is characterized in that described mobile communication terminal also is provided with: mode decoder in described channel coding/decoding controller, deciphering first channel produces the occupied information of radio frequency module and is used to control the signal of second channel to the radio frequency module, and wherein said radio frequency control module RFC1 and RFC2 are under the control of the signal that mode decoder produces, the receiver module RX2 that makes second channel is at the every other time slot except that the working time slot of the reception of first channel and sending module RX1 and TX1, available base stations is searched for continuously, to detect the base station that all can switch.
The present invention has the following advantages: shorten the search time of finishing the base station greatly, adopt said method, be 1 multiframe period the search time of base station, though in fact may need 1～3 times an of multi-frame, also than shortening greatly the search time in the existing P HS system; Owing to adopt search continuously,, enlarged the hunting zone so can search and the synchronous bad base station (CS3 among Fig. 8) of current communication base station (CS1 among Fig. 8).
Description of drawings
These and other purposes of the present invention and advantage will be from becoming clear the specific descriptions for the embodiment of the invention, wherein with reference to the accompanying drawings:
Fig. 1 is the schematic diagram of the mobile communication system of prior art;
Fig. 2 is the data structure schematic diagram of the time slot of this PHS system;
Fig. 3 is frame, the multi-frame structure schematic diagram of PHS system;
Fig. 4 is a process schematic diagram of setting up flow process with the conversation of new base station;
Fig. 5 is the flow chart that still keeps original communication process in the search of carrying out new base station and new TCH foundation of prior art;
Fig. 6 is the schematic diagram of CCH frame data of each base station of search of prior art;
The flow chart of Fig. 7 for adopting burst (burst) receive mode to carry out base station search and selection;
Fig. 8 is that the time slot between each base station CS of prior art exists overlapping schematic diagram;
Fig. 9 is the functional block diagram according to mobile terminal system of the present invention;
Figure 10 is the CHC partial interior structural representation according to portable terminal of the present invention;
Figure 11 is the structure of time slot figure according to continuous search of the present invention;
Figure 12 is the time slot map according to the reception/transmission of channel 1 of the present invention and channel 2 and control thereof;
Figure 13 is the flow chart according to continuous search of the present invention;
Figure 14 is the time slot map according to each parameter of continuous search of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in detail.
The present invention is directed to baseband circuit and need support 2 road operations that receive simultaneously and send, wherein one the tunnel is used to keep former communication, and another road is used to carry out the search of new base station and the foundation of new business channel.
Fig. 9 is the modular structure block diagram of mobile terminal system of the present invention, and it is an example with the PHS system, and wherein CHC (channel coding/decoding controller) part is to realize the main functional modules of baseband functions and sequential control etc.Figure 10 is the internal structure of the CHC part of terminal.As shown in Figure 9, this portable terminal comprises: baseband circuit, this baseband circuit comprises: central controller CPU, its control high speed bridgt circuit, and receive interrupt signal from interrupt control unit (INTC), and the high speed bridgt circuit is connected with peripheral unit control (peripheralcontrol), vocoder (VOICE), channel coding/decoding controller (CHC) and modulator-demodulator (MODEM) by the low speed bridgt circuit.Also comprise memory, ancillary equipment and radio-frequency module (RF module) outside baseband circuit, it is connected with baseband circuit respectively, and the data and the processing that are used to store from baseband circuit receive aerial radiofrequency signal by antenna.Referring to Figure 10, this CHC circuit comprises: submodule RX1, the RX2 and TX1, the TX2 that finish reception and sending function, wherein, TX module (TX1 and TX2) links to each other with TMG module (TMG1 and TMG2), and the RX1 module links to each other with TMG2 with TMG1 respectively with the RX2 module, and receives the signal from external modem respectively; Also comprise submodule RFC1 and RFC2 that control external radio frequency module (RF module) switch and parameter are provided with, this RFC1 is connected with TMG2 with TMG1 respectively with RFC2, and (conventional method is that RFC1 is connected with TMG1, RFC2 is connected with TMG2), and be connected with modulator-demodulator with the RF module respectively, be used to control the work of RF module and modulator-demodulator; Also comprise the submodule TMG CH1 and the TMG CH2 that realize portable terminal and base station synchronization and the required sequencing control of other frame structures is provided, it is connected with RX2 with RX1 respectively; Produce the submodule INT1 and the INT2 of various interruptions, it produces interrupt signal respectively to CPU, comes work to be controlled this CHC by CPU; It can also be seen that from accompanying drawing 10, this CHC also comprises mode decoder (mode decoder) and switches radio frequency control circuit (HSHOV RF control circuit) at a high speed, wherein, mode decoder respectively with RX1, RX2 and high speed are switched radio frequency control circuit and are connected, its high speed switching radio frequency control circuit is controlled RFC1 and RFC2 respectively, switching the search phase at a high speed, the work that radio frequency control circuit is controlled RFC1 and RFC2 is respectively switched in mode decoder control at a high speed, RFC1 and RFC2 use TMG1 as work clock under this mode of operation, so that the continuous search of RX2 all time slots outside the working time slot of RX1/TX1, all obtain CCH data from the reception of RF module, may detected all CS to detect.
With regard to high speed switching itself, base station search scope in the ideal should be illustrated in fig. 11 shown below, All Ranges except the time slot that portable terminal is being conversed, as long as the base station is dropped on wherein, and do not surpass the correctly scope of demodulating data of terminal internal modulation demodulator (MODEM) with the time slot of current talking overlapping (overlap), just should be all found.
For the base station search scope that reaches in the ideal receives, the present invention adopts the method for a kind of " base station search continuously " to realize.The schematic diagram of this method is referring to Figure 12, realize that RFC submodule RFC1 and RFC2 among the CHC of the present invention finish conversation time slot (corresponding TCH) and (other zones, base station search district, corresponding CCH) the frequency and the automatic switchover repeatedly of RF power switch, keeping a route RX1/TX1 who converses to finish, another road RX2 then receives always, correct CCH frame data are not subjected to the restriction of any frame structure, so long as just can receive.That is to say; no matter the CCH frame of arbitrary new base station is the position that appears at the current communication sending time slots of counterpart terminal; appear on two positions between the time slot no matter also be; still have necessarily overlapping with current communication time slot; so long as CCH frame data or effective CCH frame are (for example; remove the overlapping frame protection bit G of possibility; other valid data in the CCH frame still can be used as correct CCH Frame after receiving) fall in the zone that RFC switches to the CCH frequency; all will be received, the base station in the promptly desirable hunting zone can be found.The sequencing control of " base station search continuously " is that mode decoder (mode decoder) is finished.To specifically describe the flow process of continuous search of the present invention below.
Come the continuous base station search method of specification below in conjunction with Figure 10 and Figure 14, wherein keep communication with channel (channel) 1, it is example that channel (channel) 2 carries out continuous base station search.Mode of operation combination as shown in the table, that the traditional baseband chip of " √ " expression is supported, " zero " expression mode of operation combination and control circuit for realizing that the continuous base station search of second channel is increased newly of the present invention, the combination of " * " expression mode of operation is not supported.As existing P HS system, on channel 1 and channel 2, do not support the combination of continuous operation.The present invention is for realizing the continuous search in the switching at a high speed, newly-increased being supported in adopted prominent method mode and adopted continuously-running duty to come work on channel 2 on the channel 1, and is supported in and adopts prominent method mode on the channel 2 and adopt continuously-running duty to come work on channel 1.
| CH1/CH2 | Do not work | Continuous operation | Burst mode |
| Do not work | √ | √ | √ |
| Continuous operation | √ | × | ○ |
| Burst mode | √ | ○ | √ |
As shown in figure 10, original design is all adopted same set of temporal information for the RX and the RFC of the channel (as channel 2) that carries out new CS search usually, promptly adopts the temporal information of the channel of conversing (as channel 1).But, in new system, control by mode decoder (ModeDecorder), switching the CS search phase at a high speed, RFC (comprising RFC1 and RFC2) adopts the temporal information of the channel 1 of communicating by letter to carry out outside RF control, and therefore receiving unit RX2 works and adopts the temporal information of channel 2 owing to adopted the pattern of continuous operation.Distributed by the RFC control data like this, RX2 receives search continuously, has just realized the CS search of all non-communication time slots.
For example, corresponding to aerial 8 working time slots (slot), if original communication of terminal receives on slot 1 as shown in figure 11, on slot 5, send, we represent the situation that takies of RF with one 8 bit variable, it can represent that traditional continuous reception can be represented with 11111111 taking then of RF with 01000100 (the absolutely empty sky of empty receipts is sent out absolutely empty) to taking of RF so.Clearly, two channel require to take the external RF module on slot1 and slot5, therefore can't carry out correct work.Now in order to realize the task of Figure 12, we adopt new coding to control to RF, RF represents that with coding 10111011 channel 2 (search channel continuously) only takies the external RF module in channel 1 (original communication channel) idle time, and the RX2 then continuous operation mode with intrinsic is identical.This shows, in switching at a high speed, the continuous operation mode of RF is different with traditional continuous operation mode, and it mainly is owing to increased " switching radio frequency control circuit at a high speed " (HSHOV RF control circuit) in RFC (RF control) module.
Wherein, the external output of this RFC mainly comprises:
The control of RXSW:RF module receiving key;
The control of TXSW:RF module transmit button;
Control is received/sent out to the ANTSW:RF module antenna;
The PLL_DATA:3-wire serial ports is used to be provided with the operating frequency and the parameter of RF module, is provided with before work slot usually;
PLLSW1: one group of signal, RF module/MODEM channel 1 work control;
PLLSW2: one group of signal, RF module/MODEM channel 2 work controls.
Switching under the control of radio frequency control circuit at a high speed, carrying out high speed when switching, (the equal high level of signal is effective among the figure as shown in figure 14 for the RF module controls sequential that realizes, ANTSW high level transmission/low level receives), after starting switching at a high speed, channel 2 enters continuous accepting state, but its corresponding RFC then is responsible for the outside RF module of control, time slot in channel 1 communication (burst reception/transmission) is given channel 1 the RF module assignment, and gives channel 2 with the RF module assignment constantly at all the other.As shown in figure 14, after channel 2 entered continuous reception, when in-position (1), RFC was operated on the receive frequency of channel 1 the RF module by PLL_DATA; Simultaneously, make modulator-demodulator (MODEM) only send the data that receive by conducting PLLSW1 and disconnection PLLSW2 to RX1 (RX1 of channel 1).During to position (2), RFC is operated on the receive frequency of channel 2 the RF module by PLL_DATA; Simultaneously, make modulator-demodulator only send the data that receive by conducting PLLSW2 and disconnection PLLSW1 to RX2 (RX2 of channel 2).Similarly, when went up (3) in the position, RFC was operated on the transmission frequency of channel 1 the RF module by PLL_DATA; Simultaneously, by closed TXSW, ANTSW also disconnects RXSW and begins to send (selection of data source by PLLSW1 realize).During to position (4), RFC is operated on the receive frequency of channel 2 the RF module by PLL_DATA; Simultaneously, by closed RXSW, PLLSW2, and disconnect TXSW, ANTSW, PLLSW1 make modulator-demodulator only send the data that receive to RX2 (RX2 of channel 2).By such moving in circles, realized switching at a high speed the continuous base station search on the basis of the original communication of maintenance that requires.
Below in conjunction with Figure 13 the control flow chart of continuous base station search is described, Figure 13 is the control flow chart of continuous base station search of the present invention.Switch starting at a high speed, order another road (for example channel 2) to carry out continuous base station search operation after, software need not other switching controls.Searching period after receiving correct CCH frame data, all can produce by the INT submodule of CHC and interrupt information such as this base station of software records and field intensity thereof.Above-mentioned interrupt operation adopts any method all must carry out.After carrying out the continuous base station search arrival time of a multiframe period, the search of all base stations is finished, then, according to the information of the base station of being write down, the field intensity information that comprises in the information as the base station or the signal to noise ratio of signal etc., terminal is selected a preferred base station, distribute new Traffic Channel then, and switch Speech Communication on new Traffic Channel, and disconnect original Traffic Channel then, thus complete whole high-speed switching process.
Although the present invention is described by above-mentioned embodiment shown in the drawings, it will be understood by those skilled in the art that to the invention is not restricted to these embodiment, on the contrary, under the prerequisite that does not break away from spirit of the present invention, can carry out various changes or modification.Therefore, scope of the present invention is only determined by appended claim and equivalent claim thereof.
Claims (14)
1. the base station search method of a mobile communication terminal in the high-speed switching process of mobile communication system, it is characterized in that described mobile communication terminal is when first channel is keeping conversing with a base station, at the every other time slot except that the current time slots of carrying out this conversation available base stations is being searched for continuously on the second channel, the information of the base station that obtains according to continuous search, to detect the base station that all can switch, select a preferred base station, distribute new Traffic Channel then, and switch Speech Communication on new Traffic Channel.
2. the method for claim 1, wherein said continuous search comprises the following steps:
Described mobile communication terminal all time slots on second channel all receive;
Wherein at the time slot that carries out described conversation, described mobile communication terminal is operated in first channel;
And at the every other time slot except that the time slot that carries out described conversation, described mobile communication terminal is operated in second channel, to receive the data message of base station.
3. method as claimed in claim 2 comprises that also described mobile communication terminal is just carried out Interrupt Process whenever the described data message that receives a base station, with timing and the field intensity information that writes down described base station.
4. method as claimed in claim 2, wherein said continuous search is finished in a multi-frame.
5. method as claimed in claim 2, the data message of wherein said base station are the control channel frame data.
6. the method for claim 1, wherein said mobile communication system is the tdma communication system.
7. method as claimed in claim 6, wherein said tdma communication system is the PHS system.
8. one kind comprises baseband circuit, the mobile communication terminal of radio frequency module and modem, described baseband circuit comprises the channel coding/decoding controller at least, described channel coding/decoding controller comprises the parallel parts of two-way that are used for first channel and second channel: receive and sending module RX1, RX2 and TX1, TX2, the radio frequency control module RFC1 and the RFC2 of control radio frequency module, reception and sending module and radio frequency control module are carried out the time block TMG CH1 and the TMG CH2 of sequencing control, and produce interrupt module INT1 and the INT2 that interrupts, it is characterized in that described mobile communication terminal also is provided with in described channel coding/decoding controller:
Mode decoder is deciphered first channel and the occupied information of radio frequency module is produced is used for the signal of second channel to the control of radio frequency module, and
Wherein said radio frequency control module RFC1 and RFC2 are under the control of the signal that mode decoder produces, the receiver module RX2 that makes second channel is at the every other time slot except that the working time slot of the reception of first channel and sending module RX1 and TX1, available base stations is searched for continuously, to detect the base station that all can switch.
9. mobile communication terminal as claimed in claim 8, wherein when carrying out described continuous search, described mode decoder is controlled described RX2, and all time slots on second channel all receive; Described mode decoder is controlled described RFC1 and RFC2, makes described mobile communication terminal:
At the working time slot of reception and sending module RX1 and TX1, described mobile communication terminal is operated in first channel;
And at the every other time slot except that the working time slot of reception and sending module RX1 and TX1, described mobile communication terminal is operated in second channel, to receive the data message of base station.
10. mobile communication terminal as claimed in claim 9, wherein said interrupt module INT2 produce and interrupt, with timing and the field intensity information that writes down described base station when receiver module RX2 receives the described data message of a base station.
11. mobile communication terminal as claimed in claim 9, wherein said continuous search is finished in a multi-frame.
12. mobile communication terminal as claimed in claim 9, the data message of wherein said base station are control channel CCH frame data.
13. mobile communication terminal as claimed in claim 8, wherein said mobile communication terminal are the TDMA mobile communication terminals.
14. mobile communication terminal as claimed in claim 13, wherein said TDMA mobile communication terminal is a phs terminal.
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