CN101075846A - Method for accelerating mobile terminal synchronization process in TD-SCDMA system - Google Patents
Method for accelerating mobile terminal synchronization process in TD-SCDMA system Download PDFInfo
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Abstract
The method relates to the synchronization of mobile terminal in TD-SCDMA system. When the base station is synchronized each other, each base station has a transmission periodical offset of synchronous channel in downlink time slot (DwPTS) and uplink time slot (UpPTS); the mobile terminal is synchronized by matching the downlink synchronous code to the uplink synchronous code.
Description
Technical field
The present invention relates to mobile device in TD-SCDMA (time division SCDMA access) system synchronously.
Background technology:
The patent No. 03150365.9, title " a kind of time-division duplex (TDD TD-SCDMA) system power control method and device ", the method of this time-division duplex (TDD TD-SCDMA) system power control, comprise step: receive the signal of the other side's emission, to obtain the parameter of signal; Extract currently used transmitting power (Ppresent); According to the signal of the other side of described reception emission, extract the transmitting power estimated value (PTX) of current uplink transmission power weighting after level and smooth; Calculate the absolute value of the difference of currently used transmitting power (Ppresent) and the current uplink transmission power weighting transmitting power estimated value after level and smooth, Δ=| PTX-Ppresent|; Judge described Δ=| which predetermined interval is the value of PTX-Ppresent| be in, and adjusts step-length according to the residing interval corresponding predetermined power of described Δ and determine step-length.
Summary of the invention
Purpose of design: the invention provides a kind of TD-SCDMA of assurance mobile device more effective synchronous method and apparatus in comprising the TD-SCDMA system of a large amount of base stations.
Design: in the portable terminal method for synchronous in the TD-SCDMA system that forms by a large amount of base stations that the present invention proposes, the TD-SCDMA base station that relates to is synchronous each other, and wherein each base station has a synchronization channel transmissions timing slip in synchronization slot; This method for synchronous has then comprised in synchronization slot realizes the concrete operations step that the mobile device up-downgoing is synchronous by the match synchronization sign indicating number.
Mobile device in the TD-SCDMA system (or travelling carriage) synchronously by mobile device (therefore being referred to as code division multiple access) from receiving, realizing from special code of search the wireless signal of one or more base stations.The 3GPP/ETSI that this point is published in as 6 months calendar year 2001s publishes among TS25.224 " physical layer procedure (TDD) of Universal Mobile Telecommunications System (UMTS) " the annex C and discusses to some extent.This wireless signal or air interface are being feature as a time duplex wireless signal.
At first, mobile device or mobile device are not known the synchronization timing of TD-SCDMA system fully.This mobile device need at least through the search in a frame period and obtain and special code between coupling.The shortcoming of this code searching is: always can have the possibility of mistake coupling, thereby must not search for no longer again, thereby spend the unnecessary time.
For this reason, the invention provides a kind of method that in above-mentioned preface, defines, in this method, be included at least one frame scanning base station radio signal and have the step of the signal of the feature that designs in advance with detection.One of them feature is the signal strength signal intensity that receives, and these features do not comprise synchronous code, and can extract the timing information relevant with the TD-SCDMA system from signal section, thereby utilizes this timing information to start the synchronizing step of this mobile device.So just can in the effective time of a frame, start synchronizing step by searching downlink synchronous code coupling (as utilizing matched filter).
In the wireless signal of scanning, first concrete signal part is the signal of base station power that mobile device receives, just received signal intensity indication (RSSI).Like this, above-mentioned method for synchronous may further comprise the steps: (1) forms the tabulation of all received powers (or RSSI) peak value that occurs at least one frame.(2) form one and the corresponding time of occurrence tabulation of above-mentioned each peak value.(3) above-mentioned received power (or RSSI) peak value continues the time period (as 300 chips) of a number of chips that requires in advance at least, and greater than the amplitude (as 3dB) that requires in advance.(4) from above-mentioned tabulation, find out time of peak-peak and appearance thereof.(5) be (peak-peak time of occurrence arrive before) in the frame time of starting point with the peak-peak time of occurrence, start synchronous searching for the first time.In the TD-SCDMA system, the wireless signal that receives in mobile device or travelling carriage has the power peak signal of an obvious periodic appearance, this is because synchronization slot is fixed in the radio frames, and each base station uses a different timing slip to send synchronizing signal in synchronization slot.The peak value of power envelope that therefore, can be by detected wireless signals detects synchronizing signal.(6) based on received power or RSSI information, mobile device is selected the strongest base station of signal, and next step obtains timing information exactly again.Can make the mobile device that enters the TD-SCDMA system have synchronous searching more efficiently like this.(7) utilize protection timing at interval to extract or calculate the timing information of frame and time slot constantly.Another part that above-mentioned signal is formed is that (subframe, as shown in Figure 2) (switch point, protection as shown in Figure 2) at interval for interior first transfer point for each subframe.Wireless sub-frame has a fixing structure: be descending pilot frequency time slot (DwPTS) and uplink pilot time slot (UpPTS) after the 0th time slot TS0.It between DwPTS and the UpPTS protection interval.In this protection at interval in (it has a predetermined length, as 96 chips), there is not signal power (system, terminal not transmit signal power), just this has allowed can carry out input in this protection interval.Can utilize this protection timing at interval to extract or calculate subframe and slot timing information constantly.(8) like this, just make mobile device start synchronizing process, and reduced the probability of synchronous code mistake coupling an optimal time.(9) as the part of this method for synchronous, this method can also comprise a more deep step, selects each channel of the strongest base station of synchronous matched signal that is:.(10) in addition, can on the basis of timing information, further extract cell parameter, referring to: TS25.223v4.1.0 (June calendar year 2001), chapters and sections 8.3 " synchronous code assessment ".(11) this method also comprises a more deep step: the timing oscillator that uses the timing information controlling mobile equipment that extracts.This just allows in the TD-SCDMA system to start the more effective and time overhead of the mode of mobile device still less.
The present invention can be widely used in the TD-SCDMA system.On the other hand, the present invention also is applicable to UTRA-TDD (time division duplex-general land wireless access), UMTS (universal mobile telecommunications system).
The mobile device that is used for said system is made up of the transceiver of processor, memory, transmitting-receiving radiofrequency signal.Wherein, memory links to each other with processor with transceiver, and processor is responsible for carrying out above-mentioned synchronizing step, realizes above-mentioned method for synchronous.
Another aspect of the present invention content relates to a software program product, and this product can download to the equipment with processor, has comprised the instruction of each step that realizes above-mentioned method for synchronous.The present invention also relates to a data medium (as recording medium or transmission medium), formed above-mentioned software program product.
The mode that portable terminal in the technical scheme 1:TD-SCDMA system is synchronous, base station (4) by synchronization mutually, wherein each base station (4) have a synchronization channel transmissions timing slip in synchronization slot (15) (DwPTS and UpPTS).This method of synchronization is included in the synchronization slot (15) (DwPTS and UpPTS) carries out synchronous step by mating descending synchronous code and uplink synchronous code with mobile device (2), the characteristics of this method of synchronization are may further comprise the steps: (1) is at a base station radio signal of time interscan (3) of at least one frame (10), have the signal section of predetermined characteristic with detection, one of them feature is a received signal intensity; (2) these features do not comprise synchronous code; (3) can extract the timing information relevant from above-mentioned signal section with the TD-SCDMA system; (4) utilize this timing information to start the synchronizing step of this mobile device (2); (5) above-mentioned signal section is base station signal (3) power that mobile device (2) receives, just received signal intensity indication (RSSI); (6) tabulation of all received powers (or RSSI) peak values (18) that occur at least one frame of formation (10); (7) form one and the corresponding time of occurrence tabulation of above-mentioned each peak value (18); (8) above-mentioned received power (or RSSI) peak value (23) continues the time period (as 1000 chips) of a number of chips that requires in advance at least, and greater than the amplitude (as 3dB) that requires in advance; (9) from above-mentioned tabulation, find out time of peak-peak and appearance thereof; (10) be a frame (10) time interior (before the arrival of peak-peak time of occurrence) of starting point with peak-peak (18) time of occurrence, start synchronous searching for the first time; (11) based on received power or RSSI information, mobile device is selected the strongest base station of signal, and next step obtains timing information exactly again.Can make the mobile device that enters the TD-SCDMA system have synchronous searching more efficiently like this; (12) utilize the timing information of protecting the timing of (14) at interval to extract or calculate frame and time slot constantly; (13) like this, just make mobile device (2) start synchronizing process, and reduced the probability of synchronous code mistake coupling an optimal time; (14) as the part of this method for synchronous, this method can also comprise a more deep step, selects each channel of the strongest base station of synchronous matched signal that is:; (15) in addition, can on the basis of timing information, further extract cell parameter; (16) this method also comprises a more deep step: use the timing oscillator (8) of the timing information controlling mobile equipment (2) extract, this just allows to start the more effective and time overhead of the mode of mobile device still less in the TD-SCDMA system.
Technical scheme 2:TD-SCDMA system comprises many mobile devices (2), base station (4), and these mobile devices (2) communicate by wireless signal (3) respectively with base station (4).Described mobile device (2) comprises: (1) digital processing unit or signal processor (7); (2) random access memory or non-transient memory (6); (3) display (5); (4) be the oscillator (8) that processor (7) provides clock signal; (5) be used to receive and dispatch the transceiver (9) of TD-SCDMA wireless signal; (6) antenna.
Technical scheme 3: the software program product that is used to realize technical scheme composition 1, it can be downloaded to technical scheme forms on the equipment that comprises processor (7) (2) described in 2, this software program comprises and is used to realize the instruction of (1) described in the technical scheme composition 1 to (16) step, this software program product relates to a data medium, is used for the software program product that storage downloads to (2).
Description of drawings
Fig. 1 is the block diagram of a mobile communcations system of application of the present invention.
Fig. 2 is the signal format of physical channel in the TD-SCDMA system.
Fig. 3 is a single structure of time slot diagram of using in the TD-SCDMA system.
Fig. 4 has shown the design drawing that is used for synchronizing channel in the TD-SCDMA system.
Fig. 5 is an overtime design drawing of received signal intensity that is used for the TD-SCDMA wireless signal.
Embodiment
Embodiment 1: with reference to accompanying drawing 1～5.The mode that portable terminal in the TD-SCDMA system is synchronous, base station 4 is by synchronization mutually, wherein each base station 4 has a synchronization channel transmissions timing slip in synchronization slot 15 (DwPTS and UpPTS), this method of synchronization is included in the synchronization slot 15 (DwPTS and UpPTS) carries out synchronous step by mating descending synchronous code and uplink synchronous code with mobile device 2, the characteristics of this method of synchronization are may further comprise the steps: (1) is at base station radio signal 3 of the time of at least one frame 10 interscan, have the signal section of predetermined characteristic with detection, one of them feature is a received signal intensity; (2) these features do not comprise synchronous code; (3) can extract the timing information relevant from above-mentioned signal section with the TD-SCDMA system; (4) utilize this timing information to start the synchronizing step of this mobile device 2; (5) above-mentioned signal section is base station signal 3 power that mobile device 2 receives, just received signal intensity indication (RSSI); (6) tabulation of all received powers (or RSSI) peak values 18 that occur at least one frame 10 of formation; (7) form one and above-mentioned each peak value 18 corresponding time of occurrences tabulation; (8) above-mentioned received power (or RSSI) peak value 18 continues the time period (as 1000 chips) of a number of chips that requires in advance at least, and greater than the amplitude (as 3dB) that requires in advance; (9) from above-mentioned tabulation, find out time of peak-peak and appearance thereof; (10) be (peak-peak time of occurrence arrive before) in 10 times an of frame of starting point with peak-peak 18 time of occurrences, start synchronous searching for the first time; (11) based on received power or RSSI information, mobile device is selected the strongest base station of signal, and next step obtains timing information exactly again.Can make the mobile device that enters the TD-SCDMA system have synchronous searching more efficiently like this; (12) utilize the timing information of protecting 14 timing at interval to extract or calculate frame and time slot constantly; (13) like this, just make mobile device 2 start synchronizing process, and reduced the probability of synchronous code mistake coupling an optimal time; (14) as the part of this method for synchronous, this method can also comprise a more deep step, selects each channel of the strongest base station of synchronous matched signal that is:; (15) in addition, can on the basis of timing information, further extract cell parameter; (16) this method also comprises a more deep step: use the timing oscillator 8 of the timing information controlling mobile equipment 2 extract, this just allows to start the more effective and time overhead of the mode of mobile device still less in the TD-SCDMA system.
Embodiment 2:TD-SCDMA system comprises many mobile devices 2, base station 4, and these mobile devices 2 communicate by wireless signal 3 respectively with base station 4.Described mobile device 2 comprises: (1) digital processing unit or signal processor 7; (2) random access memory or non-transient memory 6; (3) display 5; (4) provide the oscillator 8 of clock signal for processor 7; (5) be used to receive and dispatch the transceiver 9 of TD-SCDMA wireless signal; (6) antenna.
Processor 7 is used to finish each step that realizes above-mentioned method for synchronous, links to each other with display 5, also with transceiver 9 interface is arranged simultaneously.Transceiver 9 also links to each other with the antenna of travelling carriage 2.Its timing oscillator of timing information control that travelling carriage 2 uses go out from the signal extraction that receives.
In Fig. 1, shown an overall simplified figure who is used for the TD-SCDMA system 1 of mobile communication.A large amount of travelling carriage 2 (MS1 ... MSN) or mobile device can carry out communication with base station 4 by wireless frequency signal 3.TD-SCDMA system 1 employing code division multiple access and time division duplex with channel allocation in one of them communication line 3.Although only listed a base station 4 at Fig. 1,, clearly, in TD-SCDMA system 1, exist a large amount of base station 4, wherein, each base station all has specific a geographical coverage or a sub-district.
Fig. 2 has shown the signal structure form of the physical channel of TD-SCDMA system 1, that is: the structure of wireless frequency signal 3.With regard to time slot 11 and system frame number (SFN), all physical layers have all adopted a three-decker.The configuration meeting of radio frames 10 and time slot 11 is different, specifically depends on resource allocation.Radio frames 10 is long for 10msec, comprises TS0～TS6 time slot 11 and is used for the 1.28Mcps system, publishes TS25.221 " universal mobile telecommunications system (UMTS) as ETSI; Physical channel and transmission channel are to the mapping (TDD) of physical channel " (version in June calendar year 2001) middle narrate the same.Each time slot 11 is long for 0.675ms, comprises 864 chips, and be applied to the up link (from travelling carriage 2 to the base station 4) or down link (from base station 4 to travelling carriage 2).In each frame 10, to distribute a time slot 11 to be used for down link at least and will distribute a time slot 11 to be used for up link at least.
Time slot 11 is a component with TDMA meaning on purposes, is used for separating on time domain the signal of different user.The physical channel of TDD is the pulse of bursty nature, is transmitted in its particular time-slot 11 in the radio frames 10 of having distributed.This distribution can be continuous,, the time slot 11 of each frame 10 can be distributed to a physical channel that is, also can be interrupted, promptly only the time slot 11 of a part of radio frames 10 is distributed to a physical channel.
Because the interference between the travelling carriage, for public TD-SCDMA system 10,4 maintenances just become enforceable requirement synchronously in the base station.Therefore, a capture effect about synchronizing channel 15 has just appearred.Need be offset toffsetn (each base station 4 has different time migrations) with regard to Measuring Time from the beginning of synchronizing channel time slot 15.This time migration toffsetn can make system 1 overcome capture effect.This time migration toffsetn is in 32 values, specifically depends on the code character of sub-district, n.Attention: cell parameter can change along with the change of frame, but this sub-district only belongs to a code character, therefore just has a time migration toffsetn.Can calculate toffsetn by following formula, exact value:
Therefore, for the TD-SCDMA frame 10 that travelling carriage 2 receives, synchronizing channel wherein has obvious characteristics on radio signal power.Fig. 5 signal be travelling carriage 1) power (or received signal intensity indication RSSI) that in a period of time, may receive.As can be seen, in the time period that synchronizing channel 15 wherein (it may occur once or twice) occurs, a plurality of peak values 18 appear in every frame 10.This is because different base stations 4 sends their synchronous code.
These peak values have some specific feature (duration of 864 chips, n minor tick multiply by 48 chips), and this makes these peak values be easy to detect.Can in travelling carriage 2, use special-purpose circuit or software to survey these peak values (for example: than the power average of receiving wireless signal greater than the signal difference of 3dB and less than the width of 1100 chips).In case these peak values are detected, travelling carriage 2 just can extract the timing (because this is the one-period signal) of synchronizing channel 15.
Afterwards, travelling carriage 2 just can be minimum thereby the search of startup synchronous code drops to the possibility of mistake coupling at optimal time (as before the peak value appearance), and make synchronizing process reach optimization (quicker synchronous).
In addition, also be in this stage, travelling carriage 2 may store a series of RSSI peak values 18 and select signal the strongest base station 4 so that set up the best connection of signal to noise ratio 3.
Turn back to Fig. 1, select in the travelling carriage 2 one to show more detailed information for example.This travelling carriage comprises processor 7 (as digital processing unit, signal processor or similar device).This processor 7 is connected to a display 5, memory 6 (for example: random access memory and/or permanent memory) and an oscillator 8, and oscillator 8 provides clock signal to processor 7.Processor 7 is used to carry out step described in the invention.Processor 7 also links to each other with a transceiver 9, and the other end of this transceiver 9 is connected on the antenna of travelling carriage 2.Travelling carriage 2 or mobile device also may use the timing information that extracts from received signal to control the operation (and synchronously) of self timing oscillator 8.
What need understand is: though the foregoing description is to the present invention's detailed explanation of contrasting; but these explanations, just to simple declaration of the present invention, rather than limitation of the present invention; any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.
Claims (4)
1, the synchronous mode of portable terminal in a kind of TD-SCDMA system, base station (4) by synchronization mutually, wherein each base station (4) have a synchronization channel transmissions timing slip in synchronization slot (15) (DwPTS and UpPTS).This method of synchronization is included in the synchronization slot (15) (DwPTS and UpPTS) carries out synchronous step by mating descending synchronous code and uplink synchronous code with mobile device (2), and it is characterized in that: the characteristics of this method of synchronization are may further comprise the steps:
(1) at the base station radio signal of time interscan (3) of at least one frame (10), have the signal section of predetermined characteristic with detection, one of them feature is a received signal intensity;
(2) these features do not comprise synchronous code;
(3) can extract the timing information relevant from above-mentioned signal section with the TD-SCDMA system;
(4) utilize this timing information to start the synchronizing step of this mobile device (2);
(5) above-mentioned signal section is base station signal (3) power that mobile device (2) receives, just received signal intensity indication (RSSI);
(6) tabulation of all received powers (or RSSI) peak values (18) that occur at least one frame of formation (10);
(7) form one and the corresponding time of occurrence tabulation of above-mentioned each peak value (18);
(8) above-mentioned received power (or RSSI) peak value (18) continues the time period (as 1000 chips) of a number of chips that requires in advance at least, and greater than the amplitude (as 3dB) that requires in advance;
(9) from above-mentioned tabulation, find out time of peak-peak and appearance thereof;
(10) be a frame (10) time interior (before the arrival of peak-peak time of occurrence) of starting point with peak-peak (18) time of occurrence, start synchronous searching for the first time;
(11) based on received power or RSSI information, mobile device is selected the strongest base station of signal, and next step obtains timing information exactly again.Can make the mobile device that enters the TD-SCDMA system have synchronous searching more efficiently like this;
(12) utilize the timing information of protecting the timing of (14) at interval to extract or calculate frame and time slot constantly;
(13) like this, just make mobile device (2) start synchronizing process, and reduced the probability of synchronous code mistake coupling an optimal time;
(14) as the part of this method for synchronous, this method can also comprise a more deep step, selects each channel of the strongest base station of synchronous matched signal that is:;
(15) in addition, can on the basis of timing information, further extract cell parameter;
(16) this method also comprises a more deep step: use the timing oscillator (8) of the timing information controlling mobile equipment (2) extract, allow to start the more effective and time overhead of the mode of mobile device still less in the TD-SCDMA system;
2, the synchronous mode of portable terminal in the TD-SCDMA according to claim 1 system, it is characterized in that: mobile device (2) communicates by wireless signal (3) respectively with base station (4).
3, the synchronous mode of portable terminal in the TD-SCDMA according to claim 1 system, it is characterized in that: described mobile device (2) comprises:
(1) digital processing unit or signal processor (7);
(2) random access memory or non-transient memory (6);
(3) display (5);
(4) be the oscillator (8) that processor (7) provides clock signal;
(5) be used to receive and dispatch the transceiver (9) of TD-SCDMA wireless signal;
(6) antenna;
This processor (7) is connected to display (5), memory (6) (as random access memory and/or permanent memory) and oscillator (8), oscillator (8) provides clock signal to processor (7), processor (7) is used to carry out step described in the invention, processor (7) also links to each other with transceiver (9), the other end of this transceiver (9) is connected on the antenna of mobile device (2), and mobile device (2) also may use the timing information that extracts from received signal to control the operation (and synchronously) of self timing oscillator (8).
4, the synchronous mode of portable terminal in the TD-SCDMA according to claim 1 system, it is characterized in that: the implementation method of the described method of synchronization comprises a software program product, this software program product can be downloaded on the mobile device that comprises processor (7) (2) described in the claim 3, and this software program comprises and is used to realize the instruction of (1) described in the claim 1 to (16) step.This software program product relates to a data medium, is used for the software program product that storage downloads to mobile device (2).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101990294A (en) * | 2009-07-30 | 2011-03-23 | 大唐移动通信设备有限公司 | GPS deviation detecting and processing method and system |
| CN102318415A (en) * | 2010-10-21 | 2012-01-11 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN101615921B (en) * | 2008-06-25 | 2014-04-02 | 上海贝尔股份有限公司 | Method and device for detecting ascending time migration of mobile station |
| US8798030B2 (en) | 2010-04-07 | 2014-08-05 | Qualcomm Incorporated | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
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2006
- 2006-10-10 CN CNA2006101319128A patent/CN101075846A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615921B (en) * | 2008-06-25 | 2014-04-02 | 上海贝尔股份有限公司 | Method and device for detecting ascending time migration of mobile station |
| CN101990294A (en) * | 2009-07-30 | 2011-03-23 | 大唐移动通信设备有限公司 | GPS deviation detecting and processing method and system |
| CN101990294B (en) * | 2009-07-30 | 2013-04-03 | 电信科学技术研究院 | GPS deviation detecting and processing method and system |
| US8798030B2 (en) | 2010-04-07 | 2014-08-05 | Qualcomm Incorporated | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN102318415A (en) * | 2010-10-21 | 2012-01-11 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN102318415B (en) * | 2010-10-21 | 2014-08-20 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
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