CN1099774C - Mobile communication equipment - Google Patents
Mobile communication equipment Download PDFInfo
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- CN1099774C CN1099774C CN97199774A CN97199774A CN1099774C CN 1099774 C CN1099774 C CN 1099774C CN 97199774 A CN97199774 A CN 97199774A CN 97199774 A CN97199774 A CN 97199774A CN 1099774 C CN1099774 C CN 1099774C
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Abstract
When a CDMA/TDD mode is adopted to carry out data communication between a base station device and a mobile station device, the base station device and the mobile station device carry out or stop VOX control to sending action on the basis whether sending data exists. When the transmitting side of a base station stops transmission, a mobile station receives an ordinary transmitting channel from the base station device and controls the transmitting power of an open loop. When the transmitting side of the mobile station stops transmission, the mobile station device transmits an empty slot with small transmitting power, and the receiving side of the base station receives the empty slot to carry out transmission space diversity.
Description
Technical field
The present invention relates to the mobile station apparatus that cellular radio Communication systems such as digital automobile phone, mobile phone are used, particularly carry out the open loop transmission power control in VOX (Voice Operated Transmission sound control transmission) when control and prevent to send the mobile station apparatus that diversity performance worsens.
Background technology
In cellular radio Communication systems such as automobile telephone, mobile phone, as can having known CDMA is arranged (Code Division Multiple Access: mode code division multiple access) at the multiple access technology that identical frequency band has a plurality of travelling carriages to communicate simultaneously.Known in the multiple access technology that other also have FDMA (Frequency DivisionMultiple Access: frequency division multiple access) mode, TDMA (Time Division Multiple Access: time division multiple access) mode etc.The CDMA mode is compared with these technology, can realize higher frequency utilization efficient, can comprise more user, and good effect is arranged in this respect.
The CDMA mode is in order to distinguish a plurality of users of total same frequency band, use the intrinsic extended code of user, extended code and information signal are multiplied each other, for much more wide that frequency band transmits, utilize this spread spectrum communication to carry out the multiple access connection spread spectrum of information signal than original information band.Particularly extended code intactly is called direct extended mode with the mode that information signal multiplies each other.Directly expanding in the CDMA mode, the signal of a plurality of travelling carriages is multiplexing in the same time period in identical frequency band.
In addition, reception and transmission use a kind of communication of identical frequency band that TDD (Time DivisionDuplex: mode time division duplex) is arranged.The TDD mode is called bidirectional mode again, is the mode of same wireless frequency being carried out tdm communication when receiving and send.With respect to the TDD mode, also has FDD (Frequency DivisionDuplex: Frequency Division Duplexing (FDD)) mode.The FDD mode is the mode that adopts different frequency to communicate when receiving and send.
Fig. 5 A is depicted as the concept map of TDD mode, and Fig. 5 B is depicted as the concept map of FDD mode.In Fig. 5 A, send at time T 1 base station, travelling carriage receives.Send at ensuing time T 2 travelling carriages, base station receives.By this process repeatedly, realize utilizing the communication of single frequency band.
In Fig. 5 B, base station sends with frequency f 1, and travelling carriage receives, and travelling carriage sends with frequency f 2, and base station receives.The chronomere of this transmission or reception is called time slot (Slot).
Directly expanding in the CDMA mode, when the sending station of hope sending station far away and undesirable (jamming station) is nearer, produce so-called " near-far problem ".In this case, recently want big from the received signal of the sending station of wishing from the received power of jamming station signal, the problem of Chan Shenging is like this, and only (expansion gain) can not suppress the phase cross-correlation between extended code fully according to processing gain, becomes and can not communicate.
For this reason, in adopting the cellular radio Communication system of directly expanding the CDMA mode, must be to the up path of base station according to the State Control transmitted power of each transfer path from travelling carriage.
In addition, in the mobile communication, the reason that worsens as path quality has decline by land.As the way that tackles decline, can consider to adopt the method that compensates the instantaneous value variation of received power by the control transmitted power.
Paper " CDMA/TDD transmit in the discussion of transmission power control " (palace, woods, adds rattan, national congress in spring of electronic intelligence Communications Society in 1994, B-418) reach " POWER CONTROL IN PACKETS SWITCHED TIMEDIVISION DUPLES SEQUENSE SPREAD SPECTRUM COMMUNICATIONS " (R.ESMAILZADEH, M.NAKAGAWA, A.KAJIWARA, proc.of VTC ' 92.pp.989-992,1992) provided the method for the transmission power control in the CDMA/TDD mode.
Decline is if identical frequency band, and the variation in sending and receiving is identical, has this symmetry.Therefore, the CDMA/TDD mode adopts the open loop transmission power control, promptly detects the power of received signal, and grasps transmission status in view of the above, sends according to transmission status decision transmission power level again.By like this, in the CDMA/TDD mode, compare with the FDD mode, can be simply and carry out high-precision transmission power control at a high speed.
As the way that tackles decline, space diversity reception to communicate also is effective in addition.Space diversity reception to communicate is that what is called utilizes a plurality of antennas of diverse location to receive electric waves, received signal is synthesized the technology of in addition demodulation again.Because the decline of received signal variation does not have correlation with every transfer path, therefore can reduce to suppress the deterioration of the quality of reception owing to decline causes the sharply probability of decline of received power level.
In the TDD mode, remain the transmitting-receiving symmetry of the decline variation that utilizes wireless transmission path, at base station a plurality of antennas are set, in base station receives, carry out diversity reception in base station one side, the transmission environment of each antenna is detected, when when base station sends, with best antenna.By like this, even the antenna of travelling carriage has only 1, in downlink path, also can carry out space diversity, can improve communication quality and do not increase the hardware size of travelling carriage.
(p25-30 1994-09) has provided transmission space diversity method in the CDMA/TDD mode to paper " scheme of the base station transmit-receive diversity mode of CDMA/TDD in transmitting " for palace etc., BCS 94-73.
The VOX control of mobile phone etc. is only to send when the sound of transmission is arranged, and stops to send when not transmitting sound, is that so a kind of purpose is energy-conservation technology.In the CDMA mode, the VOX control technology is the major technique that increases power system capacity.
In TDMA and FDMA, power system capacity is fixed, and different therewith, and in CDMA, power system capacity is according to the user's who communicates simultaneously interference volume decision.This is called soft capacity (SoftCapacity).Power system capacity in the CDMA mode can disturb the increase capacity by reducing.
Utilizing VOX to stop to send and just mean the interference that reduces in this state other user's generations, is associated with the increase power system capacity.For example, when whole users sound/when noiseless ratio is 50%, say statistically that the number of users of Fa Songing is half simultaneously, capacity becomes 2 times as a result.
But, in the CDMA/TDD mode, under the situation of carrying out VOX control, when noiseless, just become the time slot that existence does not send.Corresponding therewith, can not the signal when receiving in the time slot that does not send infer the state of transfer path at receiver side.Its resultant problem is, can not carry out the open loop transmission power control and send space diversity, and the decline pace of change that control can be followed the tracks of is slow, the speed ability variation.
Invention discloses
The present invention proposes in view of above-mentioned actual conditions, and its purpose is, even provide at the mobile station apparatus that carries out also not making the open loop transmission power control under the VOX control situation and send the diversity performance deterioration.
For reaching aforementioned purpose, the present invention is in VOX control, when the base station transmitter side stops to send, travelling carriage receives the usual channel that always sends of base station, carry out the open loop transmission power control, when travelling carriage stopped to send, the empty slot that transmitted power is little sent, and base station receives empty slot and sends space diversity.
Communication system of the present invention has a plurality of base stations and a plurality of travelling carriage, these a plurality of base stations and a plurality of travelling carriage have the means of communication of directly expanding CDMA/TDD (CDMA/TDD) mode as the utilization of multi-access mode, in base station and travelling carriage, have according to having or not in the communication and send the VOX function that data send or stop to send, have a plurality of antennas at base station, and has a takeover diversity function that the signal that will utilize aforementioned a plurality of antenna to receive in the time of reception of TDD synthesizes, also have and be used in the transmission diversity feature that the TDD received power time of reception sends at the delivery time of TDD for maximum antenna, have when stopping to send the function that will the spacing wave littler sends at travelling carriage than common transmitted power.
Have following effect according to such communication system,,, also can suppress to send in the base station deterioration of space diversity performance by utilizing spacing wave even promptly under the situation that travelling carriage stops to send in VOX control.
Other communication system of the present invention, have the common control information transmitting-receiving control channel sending function that connects of a plurality of travelling carriages at base station, travelling carriage have TDD detect the time of reception received signal power level function, control the transmission power control function of transmitted power and when base station stops to send, receive the function that aforementioned control channel carries out transmission power control at the TDD delivery time with aforementioned received signal level.
Have following effect according to this communication system,, receive control channel and be used for transmission power control, also can suppress the mis-behave of open loop transmission power control by travelling carriage even promptly under the situation that base station stops to send in VOX control.
Brief Description Of Drawings
Fig. 1 is the functional-block diagram of the cellular radio Communication system base station side device of the embodiment of the invention.
Fig. 2 is the functional-block diagram of the cellular radio Communication system mobile station side device of the embodiment of the invention.
Figure 3 shows that the frame pie graph of the embodiment of the invention.
The only travelling carriage that Fig. 4 A is depicted as the embodiment of the invention stops the frame pie graph under the transmission situation.
Fig. 4 B is depicted as the base station of the embodiment of the invention and travelling carriage both sides and all stops frame pie graph under the transmission situation.
Fig. 5 A is the concept map of expression TDD mode notion.
Fig. 5 B is the concept map of expression FDD mode notion.
The optimal morphology that carries out an invention
The cellular radio Communication system that just has base station side device and a plurality of mobile station side devices with reference to the accompanying drawings adopts embodiments of the invention to be specified.
Figure 1 shows that the base station side device in the relevant cellular radio Communication system of present embodiment, Figure 2 shows that the mobile station side device in the same cellular radio Communication system.In the cellular radio Communication system of present embodiment, establish and utilize the CDMA/TDD mode to carry out data communication between base station and travelling carriage.
Base station side device 1 is arranged side by side a plurality of baseband processing unit 2-1～2-n.In cellular radio Communication system, because base station communicates with a plurality of travelling carriages simultaneously, so baseband processing unit 2-1～2-n has and the corresponding quantity of maximum quantity that can the while mobile stations communicating.Not distinguishing under the situation of baseband processing unit 2-1～2-n one by one, only be illustrated below as baseband processing unit 2.
Base station side device 1 will be sent the transmission data 3 of travelling carriage at the base station sending time slots of TDD.In the TDD mode, each time slot of configuration frame is divided into base station sending time slots and travelling carriage sending time slots by the time.When base station was sending time slots, travelling carriage was in receiving slot.In addition, when travelling carriage was sending time slots, base station was in receiving slot.
To send data 3 input baseband processing units 2.Transmission data 3 are admitted to the encoder 4 in the baseband processing unit 2.Encoder 4 will send the data 3 back configuration frame structure of encoding and export to expander 5.Expander 5 at baseband processing unit 2 distributes different extended codes to each travelling carriage.The intrinsic extended code of travelling carriage in expander 5 usefulness transmission sources is carried out extension process to the transmission data of configuration frame structure.The transmission data of spread spectrum offer switch 6.The signal that switch 6 utilizes diversity synthesizer described later to provide will send a certain side that data are exported to the 1st adder 7-1 or the 2nd adder 7-2.In addition, control channel generator 8 will be exported to the 1st adder 7-1 with the control channel signals of proprietary extensions sign indicating number expansion.The 1st adder 7-1 and the 2nd adder 7-2 carry out addition with the output of a plurality of baseband processing unit 2-1～2-n and control channel generator 8.Each output of the 1st adder 7-1 and the 2nd adder 7-2 is exported to corresponding the 1st transmission RF unit 9-1 and the 2nd respectively and is sent RF unit 9-2.The 1st send RF unit 9-1 and the 2nd send RF unit 9-2 to the transmission data of input modulate, frequency translation and processing and amplifying, send to wireless transmission path from the 1st antenna 11-1 and the 2nd antenna 11-2 respectively by the 1st switch 10-1 and the 2nd switch 10-2 respectively.
In addition, base station side device 1 receives multiplexed signals from a plurality of travelling carriages at the base station receiving slot of TDD.The 1st antenna 11-1 and the 2nd antenna 11-2 receive the signal of sending here by the different radio transfer path from the multiplexed signals of a plurality of travelling carriages, and export to the 1st reception RF unit 12-1 and the 2nd reception RF unit 12-2 respectively.
The 1st reception RF unit 12-1 and the 2nd receives RF unit 12-2 and carries out frequency translation, automatic gain control and treatment and demodulation process for the received signal of multiplexing process, exports to a plurality of baseband processing unit 2-1～2-n.The 1st output that receives RF unit 12-1 and the 2nd reception RF unit 12-2 inputs to correlator 13-1 and the 13-2 that is provided with in the baseband processing unit 2 side by side.Correlator 13-1 and 13-2 isolate the signal to this TV station by the 1st output that receives RF unit 12-1 and the 2nd reception RF unit 12-2 is carried out relevant treatment with the intrinsic extended code of the travelling carriage in transmission source.The signal that separates carries out RAKE with RAKE (separating multiple diameter) synthesizer 14-1 and 14-2 and synthesizes, and exports to diversity synthesizer 15 again.
In addition, mobile station side device 18 sends in the transmission data 19 that the travelling carriage sending time slots of TDD will send to base station.To send data 19 input coding devices 20.Encoder 20 will send the data 19 back configuration frame structure of encoding.The transmission data input expander 21 of configuration frame structure.At this moment, spacing wave generator 22 is exported to expander 21 in the moment of aftermentioned regulation with spacing wave.The different extended code of each travelling carriage of expander 21 usefulness is carried out extension process to input signal, spread signal is exported to sent RF unit 23.Send that the 23 pairs of input signals in RF unit are modulated, frequency translation and processing and amplifying.The output that sends RF unit 23 sends to wireless transmission path by switch 24 from antenna 25.
In addition, mobile station side device 18 receives transmission signal from base station at the travelling carriage receiving slot of TDD.To export to by the signal that antenna 25 receives and receive RF unit 26 from base station.Receive RF unit 26 and carry out frequency translation, automatic gain control and treatment and demodulation process, export to correlator 27 for the received signal of multiplexing process.Correlator 27 utilizes the different extended code of each travelling carriage to carry out relevant treatment, isolates signal to oneself from the output that receives RF unit 26.The signal that separates carries out RAKE with RAKE synthesizer 28 and synthesizes, and decodes at decoder 29, as receiving data 30 outputs.
In addition, the output of correlator 27 is input to incoming level testing circuit 31.Incoming level testing circuit 31 detects the relevant output average power in the travelling carriage sending time slots, and with the transmitted power of time-multiplexed next sending time slots of this value decision, control signal is exported to sent RF unit 23.
Figure 3 shows that the frame that sends data constitutes.As shown in Figure 3,1 frame is made of a plurality of time slots, is such decision in frame, and promptly the sending time slots of base station is before.In this figure institute example, constitute 1 frame by 8 time slots.Each frame has the state notifying position 32 of free of data in its most preceding time slot sends the expression frame.Thereby even do not sending the also necessary the most preceding time slot of transmit frame under the data conditions, the frame of being difficult that has that sends data is that unit switches.
Below in the cellular radio Communication system that just as above constitutes the action during VOX control be illustrated.Being divided into three kinds of situations that base station only stops to send, only travelling carriage stops to send and base station and travelling carriage both sides stop to send is illustrated.
Only base station side device stops to send the situation of action.
Base station side device 1 sends the state notifying position 32 that expression stops to send action at the most preceding time slot of frame, and 7 time slots of back then stop to send.
Receive the most preceding time slot at mobile station side device 18, this most preceding time slot sends the state notifying position 32 that expression stops to send action.Mobile station side device 18 is by the content of inspection in the state notifying position 32 of the most preceding time slot reception of received frame, and in fact know does not have data in the received frame.
The most preceding time slot at received frame receives under the situation of state notifying position 32, and the extended code that correlator 27 usefulness are distributed to each travelling carriage is only isolated signal to oneself for the state notifying position 32 of preceding time slot.Incoming level testing circuit 31 is in order to carry out transmission power control, detects power to the signal of oneself from the received signal of preceding time slot.The extended code of the control channel that sends at ordinary times in the correlator 27 usefulness receiving slots is carried out relevant treatment for back 7 time slots of the received frame that sends state notifying position 32 at the most preceding time slot.Incoming level testing circuit 31 detects the power of the relevant correlation of control channel for back 7 time slots, and carries out transmission power control according to this testing result.
Thereby even when base station side device 1 does not send signal, in mobile station side device 18, the control interval of transmitted power power control does not change yet, and can worsen by rejection.
Only the mobile station side device stops to send the situation of action
Mobile station side device 18 sends the state notifying position 32 that expression stops to send action at the most preceding time slot of transmit frame, and back 7 time slots in this transmit frame send spacing wave.Fig. 4 A is depicted as the transmit status of each time slot when only the mobile station side device stops to send action.This spacing wave is expanded by the spacing wave that expander 21 produces spacing wave generator 22 to form.
Base station side device 1 is identical with common situation at the most preceding time slot of frame, transmitting antenna when the power selection of the hope signal of the Signal Separation that utilization receives from the 1st antenna 11-1 and the 2nd antenna 11-2 at correlator 13-1 and 13-2 and RAKE synthesizer 14-1 and 14-2 sends next time, the transmitting antenna the when power selection of the spacing wave of the Signal Separation that receives from the 1st antenna 11-1 and the 2nd antenna 11-2 at correlator 13-1 and 13-2 and RAKE synthesizer 14-1 and 14-2 with 7 time slot utilizations of the back of this frame sends next time.
By like this, there is the data conditions of transmission identical with mobile station side device 18, can send space diversity.
In addition, in order to carry out the purpose of day line options in the base station side, send spacing wave from mobile station side.Just to carrying out day line options in the base station side and use under the situation of spacing wave, spacing wave is just enough with the transmitted power littler than common time slot.Therefore, mobile station side device 18 is controlled the transmitted power that makes spacing wave less than the transmitted power of time slot usually.By like this, can reduce interference to other users.
Base station side device and mobile station side device both sides stop to send the situation of action.
The identical control of situation that the open loop transmission power control of mobile station side device 18 and base station side device 1 only stop to send.
Base station side device 1 is transmit frame the most preceding interior time slot only.Base station side device 1 is in order to select transmitting antenna when sending the transmission data of the most preceding time slot, as long as the receiving slot in its front is the last time slot of former frame received signal is arranged.Therefore, mobile station side device 18 only sends spacing wave at the last time slot of 1 frame.Thereby mobile station side device 18 exists and stops the time slot to send fully, can more improve minimizing to other user's effects of jamming.
The possibility that industry is utilized
As mentioned above, the mobile station apparatus that the present invention is relevant is for the cellular radio that adopts the CDMA/TDD mode VOX control in the communication system is useful, open loop transmission power control and inhibition when being applicable to VOX control Send the deterioration of diversity performance.
Claims (6)
1. a mobile station apparatus is characterized in that, comprises:
Check the inspection part whether data send from base station device; With
Control section, if send data from base station device, then this control section sends to the time slot transmitted power of base station device according to the received power control of these data, if do not send data from base station device, then this control section is controlled the time slot power that sends to base station device according to the received power of control channel signals, and this control channel signals always sends from base station device.
2. mobile station apparatus as claimed in claim 1 is characterized in that, wherein, described inspection part checks that described state notifying position is included in first time slot of received frame whether by sending described data with reference to the state notifying position from described base station device.
3. mobile station apparatus as claimed in claim 1 is characterized in that, also comprises:
Send part, just in first time slot of transmit frame, do not send another state notifying position if there are data to send to base station device, also at least one other time slot except described first time slot of transmit frame, send spacing wave, described another state notifying bit table is bright not to have data to send to base station device, and described spacing wave is used for selecting transmitting antenna at base station device.
4. mobile station apparatus as claimed in claim 3 is characterized in that, wherein, described transmission part sends described spacing wave at least one time slot of transmit frame.
5. mobile station apparatus as claimed in claim 3 is characterized in that, wherein, described transmission part is low to the power that the time slot that does not comprise this spacing wave sends to the power ratio that the time slot that comprises spacing wave sends.
6. a mobile station apparatus transmitted power control method is characterized in that, this transmitted power control method comprises the following step:
Check whether send data from base station device; With
If send data from base station device, then send to the time slot transmitted power of base station device according to the received power control of these data, if do not send data from base station device, then send to the time slot transmitted power of base station device according to the received power control of control channel signals, this control channel signals always sends from this base station device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97199774A CN1099774C (en) | 1997-09-19 | 1997-09-19 | Mobile communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97199774A CN1099774C (en) | 1997-09-19 | 1997-09-19 | Mobile communication equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238080A CN1238080A (en) | 1999-12-08 |
| CN1099774C true CN1099774C (en) | 2003-01-22 |
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ID=5179823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97199774A Expired - Fee Related CN1099774C (en) | 1997-09-19 | 1997-09-19 | Mobile communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1099774C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7139324B1 (en) * | 2000-06-02 | 2006-11-21 | Nokia Networks Oy | Closed loop feedback system for improved down link performance |
| JP3801526B2 (en) * | 2002-04-30 | 2006-07-26 | 松下電器産業株式会社 | Wireless transmission device and wireless reception device |
| JP4551814B2 (en) * | 2005-05-16 | 2010-09-29 | Ｏｋｉセミコンダクタ株式会社 | Wireless communication device |
| CN101840219B (en) * | 2009-09-30 | 2012-09-19 | 浙江大学 | Wetland park oriented security precaution integrated system and method |
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1997
- 1997-09-19 CN CN97199774A patent/CN1099774C/en not_active Expired - Fee Related
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| CN1238080A (en) | 1999-12-08 |
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Granted publication date: 20030122 Termination date: 20130919 |