CN1949693B - Method for improving up synchronous transmission accuracy in TD SCDMA - Google Patents
Method for improving up synchronous transmission accuracy in TD SCDMA Download PDFInfo
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- CN1949693B CN1949693B CN2006101449494A CN200610144949A CN1949693B CN 1949693 B CN1949693 B CN 1949693B CN 2006101449494 A CN2006101449494 A CN 2006101449494A CN 200610144949 A CN200610144949 A CN 200610144949A CN 1949693 B CN1949693 B CN 1949693B
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- 238000000034 method Methods 0.000 claims abstract description 17
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Abstract
The invention discloses a method of improving uplink synchronous transmission accuracy in TD-SCDMA system, comprising the steps of: (1) terminal estimates space transmission path loss according to the received base station-transmitted downlink pilot frequency time gap or first common control physical channel power, and calculates space delay value according to the path loss; (2) the terminal extracts the pre-measured terminal hardware delay value stored inside, and transmits uplink pilot frequency time gap to the base station by using the sum of the terminal hardware delay value and the space transmission delay value as advanced time. Thus, it can assure the base station can accurately receive uplink pilot frequency time gap, improving uplink synchronous transmission accuracy in the TD-SCDMA system.
Description
Technical field
The present invention relates to a kind of method that improves the uplink synchronous transmission quality, improve the method for uplink synchronous transmission precision in the particularly a kind of TD-SCDMA system.
Background technology
TD-SCDMA (Time Division-Synchronization Code Division Multiple Access, TD SDMA) require to have strict up-downgoing synchronous, based on above-mentioned strict demand, the base station needs the upward signal of mobile phone to arrive the antenna for base station end at official hour, because there is time delay in the propagation of wireless signal in mobile phone hardware and space, so just require mobile phone must shift to an earlier date a period of time emission, the time that this section launched in advance just is the required Timing Advance (TA) of emission.
For transmitting of mobile phone, it at first will pass through the hardware components of mobile phone and then could arrive the antenna end of base station by space outerpace, so Timing Advance comprises two parts, a part is the propagation delay time of mobile phone hardware, and another part is the propagation delay time of space outerpace.The hardware components of mobile phone comprises numerical portion and simulation part, and the propagation delay time of digital hardware part can obtain by analyzing accurate Calculation; And simulate the propagation delay time of part (comprising after the DAC and radio frequency) because the discreteness of hardware is can't be by calculating, the difference of simulating the part propagation delay time simultaneously between the different mobile phone boards is bigger.
Stipulate according to the TD-SCDMA agreement, the basic process of uplink synchronous is, UE (User Equipment at first, terminal) according to DwPTS (the Downlink Pilot Time Slot that receives, descending pilot frequency time slot) or PCCPCH (Primary CommonControl Physical Channel, primary public control physical channel) power estimates the path loss of spatial transmission, and then according to propagation delay between this path loss calculation clearancen, thereby can obtain the Timing Advance UpPCH of UpPTS (Uplink Pilot Time Slot, uplink pilot time slot) emission
ADv, with this Timing Advance emission UpPTS.The base station calculates the adjustment amount UpPCH that UpPTS at this moment also needs launch time after receiving the UpPTS of UE emission then
POS, this adjustment amount UpPCH
POSIt is exactly the hardware time delay of mobile phone; The base station in FPACH (Fast Physical Access Channel, physical access channel) with this adjustment amount UpPCH
POSSend to UE.UE is receiving UpPCH
POSAfterwards, at UpPCH
ADvThe basis on add UpPCH
POS, and with this Timing Advance emission PRACH (Physical Random Access Channel, Physical Random Access Channel), thereby finally finish uplink synchronous.But if the hardware delay of UE is bigger, it is bigger with the time phase difference of requirement to make UpPTS arrive time of base station, thereby makes the base station correctly not receive UpPTS, causes uplink synchronous to be failed the most at last.
Summary of the invention
For defective and the deficiency that overcomes prior art, the object of the present invention is to provide the method that improves the uplink synchronous transmission precision in a kind of TD-SCDMA system, can avoid bigger, make that the base station can not correctly receive uplink pilot time slot and uplink synchronous failure that cause by the terminal hardware time delay.
In order to achieve the above object, improve the method for uplink synchronous transmission quality in a kind of TD-SCDMA of the present invention system, may further comprise the steps:
(1) terminal estimates the path loss of spatial transmission according to the power that receives descending pilot frequency time slot that the base station sends or primary public control physical channel, and according to propagation delay value between this path loss calculation clearancen;
(2) terminal is taken out and to be stored in the terminal hardware time delay value that this terminal inner records in advance, and with this terminal hardware time delay value and spatial transmission time delay value and be that Timing Advance is launched uplink pilot time slot to the base station.
As a further improvement on the present invention, also comprise after the described step (2):
(3) after the uplink pilot time slot that terminal sends is received in the base station, calculate the adjustment amount that this moment, uplink pilot time slot also needed launch time, and in physical access channel, send to terminal;
(4) after terminal is received this adjustment amount, with this terminal hardware time delay value, spatial transmission time delay value, adjustment amount and be that Timing Advance transmit physical Random Access Channel is given the base station.
As a further improvement on the present invention, the method that records and be stored in the terminal hardware time delay value of this terminal inner in the described step (2) in advance is:
(A) terminal is linked to each other by coaxial cable with the whole instrument of surveying, record this terminal hardware time delay value by whole survey instrument and be stored in terminal inner.
As a further improvement on the present invention, described step (A) is specially:
(A1) with terminal with survey eventually instrument and link to each other by coaxial cable after, terminal is to surveying instrument transmission uplink pilot time slot eventually;
(A2) survey eventually instrument and receive this uplink pilot time slot after, by computing time adjustment amount obtain the terminal hardware time delay value;
(A3) survey instrument eventually and in physical access channel, send this terminal hardware time delay value to terminal;
(A4) after terminal is received this time delay value, this time delay value is stored in the not evanescent fixed memory of terminal.
After adopting above-mentioned method, because terminal is first when the base station sends uplink pilot time slot, the hardware time delay value that in the Timing Advance that sends, has just added terminal, the base station can be not bigger because of the excessive time phase difference of time that uplink pilot time slot arrives the base station and requirement that causes of the hardware time delay of terminal, make the uplink synchronous failure, thereby can guarantee this uplink pilot time slot of the correct reception in base station, improve the transmission precision of uplink synchronous in the TDS-CDMA system.
Description of drawings
Fig. 1 carries out the communication flow diagram of uplink synchronous in the TD-SCDMA system for the present invention;
Fig. 2 is for recording the structure chart of terminal hardware time delay among the present invention;
Fig. 3 is for recording the flow chart of terminal hardware time delay among the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, the communication flow diagram for the present invention carries out uplink synchronous in the TD-SCDMA system may further comprise the steps:
(101) terminal estimates the path loss of spatial transmission according to the power that receives descending pilot frequency time slot that the base station sends or primary public control physical channel, and according to propagation delay value between this path loss calculation clearancen;
(102) terminal is taken out and to be stored in the terminal hardware time delay value that this terminal inner records in advance, and with this terminal hardware time delay value and spatial transmission time delay value and be that Timing Advance is launched uplink pilot time slot to the base station;
(103) after the uplink pilot time slot that terminal sends is received in the base station, calculate the adjustment amount that this moment, uplink pilot time slot also needed launch time, and in physical access channel, send to terminal;
(104) after terminal is received this adjustment amount, with this terminal hardware time delay value, spatial transmission time delay value, adjustment amount and be Timing Advance transmit physical Random Access Channel.
Like this, when terminal first when the base station sends uplink pilot time slot, the hardware time delay value that in the Timing Advance that sends, has just added terminal, the base station can be not bigger because of the excessive time phase difference of time that uplink pilot time slot arrives the base station and requirement that causes of the hardware time delay of terminal, make the uplink synchronous failure, thereby can guarantee this uplink pilot time slot of the correct reception in base station, improve the transmission precision of uplink synchronous in the TDS-CDMA system; Wherein, if terminal hardware without any variation, above-mentioned step (101) and step (102) just can be finished uplink synchronous accurately, have not only guaranteed the transmission precision of uplink synchronous, and have shortened the needed time of uplink synchronous; If terminal just can be adjusted uplink synchronous by the process in step (103) and the step (104), thereby can further improve the transmission precision of uplink synchronous owing to problems such as wearing out of hardware change the time delay of hardware.
Because the discreteness of terminal hardware, each terminal hardware time-delay all has difference, therefore, employed terminal hardware time delay value is by calibrating of each terminal obtained in the communication process of the present invention, as Fig. 2, shown in Figure 3, the method that the present invention obtains the hardware time-delay is that terminal is linked to each other by coaxial cable with the whole instrument of surveying, use such connection just can make terminal and survey the spatial transmission time delay of instrument in communication process eventually and be approximately zero, the time adjustment amount that records by whole survey instrument is exactly the hardware time delay of this terminal, and the process that records this hardware time delay is specially:
(301) with terminal with survey eventually instrument and link to each other by coaxial cable after, terminal is to surveying instrument transmission uplink pilot time slot eventually;
(302) survey eventually instrument and receive this uplink pilot time slot after, by computing time adjustment amount obtain the terminal hardware time delay value, and in physical access channel, send this terminal hardware time delay value to terminal;
(303) after terminal is received this time delay value, this time delay value is stored among the NV (Non-Vanishing, not evanescent fixed memory).
Like this, this UE takes out this value from NV when making uplink synchronous later on, and is superimposed upon the space propagation delay time value that terminal records and sends uplink pilot time slot.
Claims (4)
1. improve the method for uplink synchronous transmission precision in the TD-SCDMA system, may further comprise the steps:
(1) power of the descending pilot frequency time slot that sends according to the base station that receives of terminal or primary public control physical channel estimates the path loss of spatial transmission, and according to propagation delay value between this path loss calculation clearancen;
It is characterized in that described step also comprises after (1):
(2) terminal is taken out the terminal hardware time delay value record and be stored in this terminal inner in advance, and with this terminal hardware time delay value and spatial transmission time delay value and be that Timing Advance is launched uplink pilot time slot to the base station.
2. according to the method that improves the uplink synchronous transmission precision in the described TD-SCDMA of claim 1 system, it is characterized in that described step also comprises after (2):
(3) after the uplink pilot time slot that terminal sends is received in the base station, calculate the adjustment amount that this moment, uplink pilot time slot also needed launch time, and in physical access channel, send to terminal;
(4) after terminal is received this adjustment amount, with this terminal hardware time delay value, spatial transmission time delay value, adjustment amount and be that Timing Advance is transmitted to the base station by Physical Random Access Channel.
3. according to the method that improves the uplink synchronous transmission precision in claim 1 or the 2 described TD-SCDMA systems, it is characterized in that, record in advance in the described step (2) and storage terminal hardware time delay value in the method for this terminal inner is:
(A) terminal is linked to each other by coaxial cable with the whole instrument of surveying, record this terminal hardware time delay value by whole survey instrument and be stored in terminal inner.
4. according to the method that improves the uplink synchronous transmission precision in the described TD-SCDMA of claim 3 system, it is characterized in that described step (A) is specially:
(A1) with terminal with survey eventually instrument and link to each other by coaxial cable after, terminal is to surveying instrument transmission uplink pilot time slot eventually;
(A2) survey eventually instrument and receive this uplink pilot time slot after, by computing time adjustment amount obtain the terminal hardware time delay value;
(A3) survey instrument eventually and in physical access channel, send this terminal hardware time delay value to terminal;
(A4) after terminal is received this time delay value, this time delay value is stored in the not evanescent fixed memory of terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101449494A CN1949693B (en) | 2006-11-24 | 2006-11-24 | Method for improving up synchronous transmission accuracy in TD SCDMA |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101449494A CN1949693B (en) | 2006-11-24 | 2006-11-24 | Method for improving up synchronous transmission accuracy in TD SCDMA |
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| Publication Number | Publication Date |
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| CN1949693A CN1949693A (en) | 2007-04-18 |
| CN1949693B true CN1949693B (en) | 2011-06-08 |
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| CN2006101449494A Expired - Fee Related CN1949693B (en) | 2006-11-24 | 2006-11-24 | Method for improving up synchronous transmission accuracy in TD SCDMA |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101472341B (en) * | 2007-12-26 | 2010-09-08 | 展讯通信（上海）有限公司 | Enhanced FACH access method based on user identity mapping FPACH allocation |
| CN102111196A (en) * | 2010-12-30 | 2011-06-29 | 中兴通讯股份有限公司 | Data sending method and device as well as remote radio unit (RRU) |
| WO2013060016A1 (en) * | 2011-10-28 | 2013-05-02 | Renesas Mobile Corporation | Methods and apparatuses for provision of an effective pathloss offset calculation mechanism for a communication system |
| CN110896560B (en) * | 2018-09-13 | 2022-06-07 | 维沃移动通信有限公司 | Uplink signal sending method and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214175A (en) * | 1996-01-18 | 1999-04-14 | 艾利森电话股份有限公司 | Procedure for Determining Transmission Delay |
| KR20050078557A (en) * | 2004-02-02 | 2005-08-05 | 엘지전자 주식회사 | Power control apparatus and method of communication system |
| CN1707972A (en) * | 2004-06-10 | 2005-12-14 | 中兴通讯股份有限公司 | Realizing method for TD-SCDMA receiving timed error LCR measurement |
-
2006
- 2006-11-24 CN CN2006101449494A patent/CN1949693B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214175A (en) * | 1996-01-18 | 1999-04-14 | 艾利森电话股份有限公司 | Procedure for Determining Transmission Delay |
| KR20050078557A (en) * | 2004-02-02 | 2005-08-05 | 엘지전자 주식회사 | Power control apparatus and method of communication system |
| CN1707972A (en) * | 2004-06-10 | 2005-12-14 | 中兴通讯股份有限公司 | Realizing method for TD-SCDMA receiving timed error LCR measurement |
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| CN1949693A (en) | 2007-04-18 |
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Granted publication date: 20110608 Termination date: 20121124 |