CN1238079A - Radiocommunication system and method therefor - Google Patents
Radiocommunication system and method therefor Download PDFInfo
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- CN1238079A CN1238079A CN 97199769 CN97199769A CN1238079A CN 1238079 A CN1238079 A CN 1238079A CN 97199769 CN97199769 CN 97199769 CN 97199769 A CN97199769 A CN 97199769A CN 1238079 A CN1238079 A CN 1238079A
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Abstract
A CDMA/TDD type radiocommunication system and a method therefor. At the time of switching the base station of a communication partner in accordance with movement, a moving station monitors the received electric power of data, as received from a peripheral base station, by a received power detector (12). When the received power from a base station other than the main one in communication exceeds a preset value, the base station is employed as a follower one to transmit the same data as those of the main base station so that the data from the main and the follower base stations are simultaneously received by a correlator (5) and a correlator (6). When the received power of the follower base station then exceeds that of the main one, the moving station switches the main base station to the follower base station and transmits the data to a new base station.
Description
The present invention relates to be used for the radio communication equipment and the method for the work of automobile electricity, portable phone etc.
In the celluler radio communication system (a plurality of radio station communicate on same frequency band simultaneously in the described system) as the automobile telephone of the multi-address system of transmission signals, portable phone etc., FDMA system, tdma system etc. are known.Recently, cdma system (code division multiple access system) has been applied to using in the system of upper frequency, and offers than such as more system users of other technologies such as FDMA system, tdma systems.
In addition, realize that with reverse link the transmission system that bi-directional transfer of data is communicated by letter also has FDD system and TDD system with the forward link between the base station as mobile station through cellular system.The FDD system adopts different frequency bands in forward direction and reverse link.The TDD system adopts identical frequency band and uses time slot to send forward link signal and reverse link signal.Thereby the CDMA/TDD mobile station equipment is that a kind of cdma system that uses uses the mobile station equipment of TDD system as the system that differentiates forward link and reverse link as multi-address system.
The structure of the CDMA/TDD mobile station equipment of the block diagram illustrating routine of use Fig. 1.
As shown in Figure 1, mobile station comprises: antenna 101, be used for and the base station between send and receive data; Switch 102 switches the time period that sends with reception; RF receiving unit 103 will become baseband signal by the data transaction that receives of switch; AD converter 104 will be converted to numerical data in RF receiving unit 103 data converted; Correlator 105 is expanded going in AD converter 104 place's data converted with extended code; And decoder 106, to go expanded data decoding at correlator 105 places.
Mobile station also comprises: synchronous circuit 107 produces according to the output of AD converter 104 and to be used in the synchronizing signal that correlator 105 places go to expand usefulness, and produces frame synchronizing signal according to the data through decoding; With timing generating circuit 108, produce the switching timing of switch 102 according to frame synchronizing signal from synchronous circuit 107 outputs.
Mobile station also comprises: encoder 111, the transmission data are encoded; Expansion multiplex electronics 112 is to making spread spectrum with each channel of multiplexing in encoder 111 place's coded datas; DA transducer 113 is converting analogue data in expansion multiplex electronics 112 place's expanded data; And RF radiating portion 114, will convert the RF data in DA transducer 113 place's data converted.
In addition, mobile station comprises control circuit 120, with the control entire equipment, such as through-put power, frame structure etc.
The mobile station of Gou Chenging as mentioned above is corresponding to the control signal from timing generating circuit 108 outputs, by switch 102 selective receptions or transmission.Under the situation of selective reception, it uses antenna 101, RF receiving unit 103, AD converter 104, correlator 105 and 106 pairs of data that receive from the base station of decoder to decipher.On the other hand, selecting under the situation about sending, it uses encoder 111, expansion multiplex electronics 112, DA transducer 113, RF radiating portion 114 and antenna 101 that the transmission data are sent to the base station.According to the frame synchronizing signal that takes place at synchronous circuit 107 places, provide the switching timing of switch 102 by timing generating circuit 108.By the control of control circuit 120 execution to each part in the mobile station.
In the CDMA/TDD of above-mentioned routine system mobile station, when mobile station when a cell of the base station of current communication moves to another cell of another base station of communication thereafter, the switching that control circuit 120 is carried out transmissions and receive frequency or extended code communicates with the base station with new traffic.
Yet, existing problems are effective switched systems that above-mentioned conventional CDMA/TDD system mobile station does not have quick base station shifting, therefore for needing time and base station, new traffic obtains synchronously, and when a cell from the base station of current communication moved to another cell of another base station of communication thereafter, mobile station must temporary transient interrupt communication.
An object of the present invention is to provide the CDMA mobile station equipment, its base station shifting at short notice when a cell from the base station of current communication moves to another cell of another base station of communication thereafter, even and appear at boundary vicinity between the cell of two base stations when mobile station, also can avoid transmission characteristic to suffer damage.
Described purpose reaches according to the following step: at first, mobile station is paid close attention to the received power that receives from the data of peripheral base station, and the performance number that receives when the base station that never is the dominant base of current communication is during greater than the predetermined electric power value, just determine that this base station is time base station, then, with dominant base is transmitted and receive data to this time base station simultaneously.After this, when the power that receives from this time base station during greater than the power that receives from dominant base, mobile station just switches dominant base and time base station, so that send data to new dominant base.
Fig. 1 is the block diagram of explanation according to the formation of the CDMA/TDD system mobile station of embodiments of the invention;
Fig. 2 is the block diagram of explanation according to the formation of the CDMA/TDD system mobile station of embodiments of the invention;
Fig. 3 is carried out the schematic diagram of handover operation by the base station when mobile station moves according to the foregoing description for explanation;
Fig. 4 to Fig. 6 is the flow chart of explanation according to the handling process of control circuit in the foregoing description CDMA mobile station equipment.
It is as follows to use accompanying drawing to describe embodiments of the invention in detail.In addition, this embodiment illustrate about with CDMA equipment as multi-address system and TDD system situation as the system that differentiates forward link and reverse link.
Fig. 2 is the block diagram of the formation of the CDMA/TDD system mobile station of the explanation embodiment of the invention.
As shown in Figure 2, mobile station comprises: antenna 1, be used for and the base station between transceive data; Switch 2 switches the time period that sends with reception; RF receiving unit 3 will become baseband signal by the data transaction that receives of switch 2; AD converter 4 will convert numerical data in RF receiving unit 3 place's data converted; Correlator 5 and correlator 6 are expanded going in AD converter 4 place's data converted with extended code, and decoder 7, to going expanded data decoding at correlator 5 and correlator 6 places.
Mobile station according to the embodiment of the invention also comprises: synchronous circuit 8, use from the output of AD converter 4 being created in the synchronizing signal that correlator 5 is used to expand, and use the data through decoding to produce frame synchronizing signal; And timing generating circuit 10, according to the switching timing of the frame synchronizing signal generation switch of exporting from synchronous circuit 82; Extended code is selected circuit 11, is created in the signal of the selection extended code of using in correlator 5 and correlator 6 places; And received power testing circuit 12, detect from the performance number that receives of the data of phaser 5 and correlator 6 outputs.
Mobile station according to the embodiment of the invention also comprises: encoder 13, the transmission data are encoded; Expansion multiplex electronics 14 is to making spread spectrum with each channel of multiplexing in encoder 13 place's coded datas; DA transducer 15 is converting analogue data in expansion multiplex electronics 14 place's expanded data; And RF radiating portion 16, will convert the RF data in DA transducer 15 place's data converted.
In addition, also comprise control circuit 20, in order to the control entire equipment according to the mobile station of the embodiment of the invention.
In addition, the control signal of 20 of control circuits and inferior base station communication, switch the function of dominant base and inferior base station control signal, finish and the control signal of the timing of the control signal of the inferior base station communication that is switched and control data transmission is sent to encoder 13.So far, be included in the timing that time adjustment information from the data that the base station receives is used to control data transmission.
Have in the mobile station of different distance with the base station, it is to proofread and correct transmission burst arrival base station temporal differences in each mobile station one side by adjusting transmit timing that the time harmonizes.
In addition, control circuit 20 transmits control signal and selects circuit 11 to extended code, is correlator 5 and correlator 6 selection extended codes; Transmit control signal to expansion multiplex electronics 14 to select extended code; Transmit control signal to decoder 7, with instruction with the situation of inferior base station communication under use two kinds of correlation data of dominant base and time base station to decipher; And transmit control signal to RF radiating portion 16, with control transmission power.So far, the control signal that is included in from the data that the base station receives is used to control transmission power.
Carry out through-put power control and time adjustment for dominant base.Yet, when dominant base is switched with time base station, before the base station is switched, receive the through-put power and the time adjustment information of time base station.Utilize this information to make control circuit can switch dominant base and time base station apace.
The following describes the reception operation of mobile station equipment in the CDMA/TDD system as constituted above.
At first, be chosen at switch 2 under the situation of reception, the reception data from the base station that receive by antenna 1 are converted into baseband signal at RF receiving unit 3 places, and are quantized at AD converter 4 places.Input to correlator 5, correlator 6, synchronous circuit 8 and synchronous circuit 9 from the numerical data of AD converter 4 outputs.
The data of input correlator 5 and correlator 6 are used in the corresponding extended code of selecting at extended code selection circuit place 11 respectively and go expansion, input to decoder 7 then.So far, the synchronizing signal by synchronous circuit 8 and 9 outputs obtains synchronously.The decoded back of data that inputs to decoder 7 exports the main body of mobile station to as the data through decoding.
In addition, the data through decoding also export control circuit 20 and synchronous circuit 8 to.Produce frame synchronizing signal at synchronous circuit 8 places according to these data, and export timing generating circuit 10 to, in view of the above, carry out the switching that transmits and receives at switch 2 places through decoding.
In addition, received power testing circuit 12 uses from the output of correlator 5 and correlator 6 and supervises the power that shows that the base station around the mobile station receives, and will point out that the data of the performance number that receives export control circuit 20 to.
The following describes the firing operation of mobile station equipment in the CDMA/TDD system.
At first, in encoder 13 place's coding transmission data,, export expansion multiplex electronics 14 to then with the control data configuration frame.In addition, be controlled at the output timing of encoder 13 place's coded datas by the control signal that is used for the time adjustment from control circuit 20.
Encoded data are expanded frequency spectrum at expansion multiplex electronics 14 places, and are multiplexed with each channel to be sent, export DA transducer 15 to.By the extended code of selecting from the control signal of control circuit 20 to be used to expand.
The numerical data multiplexed through spread-spectrum converts analog signal at DA transducer 15 places, converts the RF signal at RF radiating portion 16 places then.The RF signal is from antenna 1 output when switch is selected transmission.The through-put power of RF signal at RF radiating portion 16 places by from control circuit 20 transmission power control signal controlled.
Below, with reference to the operation of the schematic view illustrating of Fig. 3 according to base station shifting in the CDMA mobile station of the embodiment of the invention.
Shown in Fig. 3 (a), in the time of near mobile station is positioned at base station A, mobile station is communicated by letter with base station A with extended code A, pays close attention to simultaneously the value of the power that receives from base station A and base station B at received power testing circuit 12 places.Mobile station uses from the correlation of correlator 5 outputs and detect the power that receives from base station A current communication, and uses from another correlation of correlator 6 outputs and detect the power that receives from peripheral base station.At this moment, the base station A of 20 pairs of current communications of control circuit carries out through-put power control and time adjustment control.
When mobile station near the mesozone between base station A and the base station B, shown in Fig. 3 (b), shift to simultaneously base station B gradually, so when detecting the power that receives from base station B greater than the predetermined electric power value at received power testing circuit 12 places, 20 pairs of encoders of the control circuit at mobile station place 13 send and base station B control of communication signal as time base station.
A receiving control information and base station B sent control information from the data that receive in base station makes the inferior base station work of base station B as mobile station.When base station B receives this control information, base station B uses the extended code B that is different from base station A that mobile station is sent the information identical with the base station.
Mobile station obtains the data as the base station A of dominant base at correlator 5 places, the while uses from the data of data acquisition through deciphering of correlator 5 and correlator 6 outputs then in the data of correlator 6 places acquisition as the base station B of time base station.Extended code A with base station A expands to the data that will send from mobile station.In addition, also carry out through-put power control and time alignment in response to base station A.
As mentioned above, owing to, before base station shifting, obtain subsequently to switch the required data of communication party, so can realize switching fast the communication party in mobile station and the data that receive when dominant base is communicated by letter from inferior base station.
Shown in Fig. 3 (c), when mobile station is crossed mesozone between base station A and the base station B, further shift to base station B, when detecting the power that receives from base station B greater than the power that receives from base station A, 20 pairs of encoders of the control circuit in the mobile station 13 send and make base station A for time base station with to make base station B be the control signal of dominant base.
When base station A from the data that receive during receiving control information, base station A sends data as the inferior ground level work of mobile station and with extended code A.When base station B received the control breath from the data that receive, base station B used extended code B that mobile station is sent the data identical with base station A.
Mobile station obtains at correlator 5 places from the data as the base station B of dominant base, obtains at correlator 6 places simultaneously from the data as the base station A of time base station, uses then from the data of correlator 5 and correlator 6 outputs and obtains data through decoding.Extended code B with base station B expands to the data that will send from mobile station.In addition, also carry out through-put power control and time adjustment in response to base station B.
In operation according to the present embodiment base station shifting, owing to obtain synchronously by base station A and B, therefore do not needed to obtain synchronously, and since base station B is time base station, the control information that through-put power and time are harmonized has sent to mobile station.Therefore, can carry out the switching of base station in the short time.
When mobile station was further shifted to base station B and be positioned near the B of base station, shown in Fig. 3 (d), 20 pairs of encoders 13 of the control circuit of mobile station transmitted control signal and communicate by letter with inferior base station A finishing.Base station B is receiving control information from the data that receive, and base station A is sent control information, so that base station A is as time base station work.When base station A received this control information, base station A just stopped the operation as time base station.
As mentioned above, during moving in the base station shifting, pay close attention to the power that receives of the data that receive from peripheral base station at received power testing circuit 12 places according to the mobile station of present embodiment.When from not being that the received power of another base station of the dominant base in the current communication is during greater than predetermined value, mobile station sends data to dominant base, these data comprise control information, when it is as dominant base, make another base station send data, and dominant base send to time base station with this control information as time base station.In addition, mobile station receives from the data of dominant base with time base station simultaneously at correlator 5 and correlator 6 places.After this, when the power of the inferior base station that receives during greater than the power of the dominant base that receives, mobile station switches dominant base and time base station, with to new dominant base send data.
Below with the flowchart text of Fig. 4 to Fig. 6 handling process according to the control circuit 20 of the mobile station of present embodiment.In addition, hypothesis base station A is a dominant base in flow chart.
At first will input to control circuit 20 (step S401) from decoder 7, then from the power information that receive (step S402) of received power testing circuit 12 inputs from each base station through the data of decoding.The performance number (step S403) of the performance number of the base station A that control circuit 20 relatively receives and the base station B that receives.When the performance number of the base station B that receives during less than the performance number of the base station A that receives, performance number and the predetermined threshold value performance number (step S404) of control circuit 20 and then the base station B that relatively receives.
Below explanation be that such situation is provided: mobile station is away from base station B, and the performance number of the base station B that receives is lower than the performance number of the base station A that receives, also is lower than predetermined threshold.
In this case, mobile station is only communicated by letter with base station A, and does not communicate by letter with base station B.
Under the situation that base station B works as time base station (step S405), 20 pairs of encoders 13 of control circuit transmit control signal, to discharge the state (step S406) of base station B as time base station.
Then, control circuit 20 discharges the timing information that base station B is time base station from the data extract through decoding, and extracts time adjustment information and the transmission power control signal of base station A, sends these information (step S407) from the base station corresponding to control signal.Control circuit 20 and then discharge in inferior base station constantly according to this information and to select circuit 11 to transmit control signal to extended code is to discharge the extended code (step S408) of base station B.In addition, extended code selects 11 pairs of correlators 6 of circuit to transmit control signal, and makes it not dateout.
In addition, under the situation that base station B does not work as time base station (step S405), control circuit 20 is from time adjustment information and the transmission power control information (step S409) of the data extract base station A through deciphering.
Then, 20 pairs of encoders 13 of control circuit transmit control signal, and to be controlled to be the base station A time is harmonized and the timing (step S410) of the data exported, and RF radiating portion 16 is transmitted control signal, with control transmission power (step S411), end process (step S412) then.In addition, data are sent to base station A.
Following explanation is that such situation is provided: the performance number of the base station B that receives is lower than the power of the base station A that receives, but is higher than predetermined threshold.
When base station B does not work as time base station (step S501), 20 pairs of encoders 13 of control circuit transmit control signal, so that base station B is time base station (step S502).
In addition, when work as time base station in the base station (step S501), control circuit 20 is from time adjustment information and the transmission power control information (step S506) of the data extract base station A through deciphering.
Then, 20 pairs of encoders 13 of control circuit transmit control signal, and to be controlled to be time of base station A is harmonized and the timing (step S410) of the data of output, and RF radiating portion 16 is transmitted control signal, with control transmission power (step S411), end process (step S412) then.In addition, data are sent to base station A.
Because mobile station obtained before base station shifting from for communicating by letter thereafter from the base station communication data necessary, therefore can finish processing at short notice, switch the required time thereby can reduce such as synchronization gain through-put power control of going to expand and time adjustment.
Following explanation is that such situation is provided: the performance number of the base station B that receives is greater than the performance number of the base station A that receives.
At first, control circuit transmits control signal to encoder 13, and making base station B is that dominant base is time base station (step S601) with making base station A.
Then, control circuit 20 switches the timing information of dominant base and time base station from input through the data extract of decoding, and extracts time adjustment information and the transmission power control information (step S602) of base station B.Control circuit 20 and then expansion multiplex electronics 14 is transmitted control signal in the moment of switching dominant base and time base station, come growth data (step S603) with the extended code of base station B, for time of base station B harmonizes encoder 13 is transmitted control signal, timing (step S604) with control data output, RF radiating portion 16 is transmitted control signal, with control transmission power (step S605), and select circuit 11 to transmit control signal, with the extended code of base station shifting A and base station B to extended code.In addition, extended code selects 11 pairs of correlators 5 of circuit to transmit control signal, and adopts the data of the extended code of base station B with output, and correlator 6 is transmitted control signal, and adopts the data of the extended code of base station A with output.
Then, 20 pairs of decoders 7 of control circuit transmit control signal, so that be used for the output (step S608) of autocorrelator 5 and correlator 6.In addition, data are sent to base station B.After this, dominant base is switched with time base station.
Switching the moment of dominant base with time base station, because mobile station obtained in advance synchronously and can obtain through-put power control and time adjustment information, so base station shifting at short notice.And then in the CDMA/TDD system, receive in the mobile station of pulse train time and can realize the base station switching controls, thereby help the switching of base station.
According to above-mentioned processing, can realize the switching with the base station of mobile service at short notice, thus interrupt communication temporarily.Even and then mobile station is between two cells on the border, also may restrain the decline of transmission quality.
The invention enables radio communication equipment and method to be applicable in equipment such as automobile telephone, portable phone to realize at short notice switching with the base station of mobile service.
The invention is not restricted to the embodiment of above-mentioned explanation, and can do various changes and correction not departing under the scope of the invention situation.
Claims (13)
1. radio communication mobile station equipment based on CDMA/TDD system transmissions data is characterized in that described equipment comprises:
Power detection device detects the power from the data of base station receive;
Comparison means compares power and the predetermined electric power value from the data of other base stations beyond the dominant base that receive in the current communication; With
Code translator, when receive from the power of described another base station during greater than the predetermined power value, selecting described another base station is time base station, and the data decoding from described base station to receiving, the data decoding from dominant base to receiving in the current communication simultaneously.
2. radio communication mobile station equipment as claimed in claim 1 is characterized in that described equipment sends command information to described dominant base, so that described base station sends the identical data of data in the current communication with dominant base.
3. radio communication mobile station equipment as claimed in claim 1, it is characterized in that when receive from the power of the data of inferior base station greater than receive from the power of the data of the dominant base of current communication the time, it is dominant base that described equipment switches described base station, with the transmission data.
4. radio communication mobile station equipment as claimed in claim 1 is characterized in that described code translator is not to the data decoding from described base station when the power from the data of described base station that receives is lower than predetermined value.
5. radio communication base station equipment based on CDMA/TDD system transmissions data, it is characterized in that receiving command information from described mobile station when described equipment, instruct another base station to send identical data to the described mobile station of described devices communicating the time, described equipment sends described command information to described another base station.
6. the radio communication base station equipment of base station CDMA/TDD system transmissions data, it is characterized in that receiving instruction from another base station with described mobile service when described equipment, when sending data to described mobile station, described equipment sends the data identical with described another base station to described mobile station.
7. radio communications system based on CDMA/TDD system transmissions data is characterized in that described radio communications system comprises:
A plurality of base stations; With
Mobile station when it is communicated by letter with described dominant base, is selected a base station as time base station the base station beyond dominant base, the power that receives from this base station receives the data identical with described dominant base greater than predetermined value from described base station.
8. radio communications system as claimed in claim 7 is characterized in that described mobile station sends command information to described dominant base, so that described base station sends the identical data of data in the current communication with described dominant base.
9. radio communications system as claimed in claim 7, it is characterized in that when receive from the power of the data of described base station receive in greater than current communication from the data power of described base station the time, it is that described dominant base is with the transmission data that described equipment switches described base station.
10. radio communications system as claimed in claim 7 is characterized in that described mobile station is not to the data decoding from described base station when the power from the data of described base station that receives is lower than predetermined value.
11. radio communications system as claimed in claim 7, it is characterized in that receiving command information from described mobile station when described dominant base, instruct described base station when sending identical data with the described mobile station of described devices communicating, described dominant base sends described command information to described base station.
12. radio communications system as claimed in claim 7, it is characterized in that receiving instruction from described dominant base with described mobile service when described base station, when instruction sent data for described mobile station, described time the base station sent the data identical with described dominant base to described mobile station.
13. the radio communications system based on CDMA/TDD system transmissions data is characterized in that comprising the steps:
Will by mobile station from the dominant base of described mobile service beyond the power that receives and the described predetermined value of the data that receive of base station compare;
During greater than predetermined value, select described base station to be time base station from the power of the data of described base station when what receive, make described base station send the data identical with the described dominant base of described mobile service; And
When receive from the power of the data of described base station greater than receive from the power of the data of the described dominant base of described mobile service the time, the described base station of switching communication with it is described base station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97199769 CN1106730C (en) | 1997-09-19 | 1997-09-19 | Radiocommunication system and method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97199769 CN1106730C (en) | 1997-09-19 | 1997-09-19 | Radiocommunication system and method therefor |
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| CN1238079A true CN1238079A (en) | 1999-12-08 |
| CN1106730C CN1106730C (en) | 2003-04-23 |
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| CN 97199769 Expired - Fee Related CN1106730C (en) | 1997-09-19 | 1997-09-19 | Radiocommunication system and method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645766A (en) * | 2016-07-21 | 2018-01-30 | 中兴通讯股份有限公司 | Poewr control method and device |
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- 1997-09-19 CN CN 97199769 patent/CN1106730C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645766A (en) * | 2016-07-21 | 2018-01-30 | 中兴通讯股份有限公司 | Poewr control method and device |
| CN107645766B (en) * | 2016-07-21 | 2021-08-27 | 中兴通讯股份有限公司 | Power control method and device |
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| CN1106730C (en) | 2003-04-23 |
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