CN1492605A - Initial upward synchronizing method of time-division duplexing system - Google Patents
Initial upward synchronizing method of time-division duplexing system Download PDFInfo
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- CN1492605A CN1492605A CNA031213537A CN03121353A CN1492605A CN 1492605 A CN1492605 A CN 1492605A CN A031213537 A CNA031213537 A CN A031213537A CN 03121353 A CN03121353 A CN 03121353A CN 1492605 A CN1492605 A CN 1492605A
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Abstract
This invention discloses an initial up-line synchronization method for a TDD system used in high speed data transmission setting T1 and T2 in every control period. The method includes: in high data transmission TDD system, two time sections are set in one control period: T1 and T2, all user ends of sending initial up-line synchronous set-up requests, its corresponding up-line synchronous codes in T1 and the network side sends response to the up-line synchronous request at T2 in concentration.
Description
Technical field
The present invention relates to the uplink synchronous technology in the mobile communication system, be meant the initial uplink method for synchronous in time division duplex (TDD) system in high speed data transfer especially.
Background technology
TD SDMA (TD-SCDMA) system is based on tdd mode, i.e. uplink and downlink are in a frequency range together, do not need paired frequency, so availability of frequency spectrum height, and the correlation of up-downgoing resource is big.But its disturbed condition is than Frequency Division Duplexing (FDD) (FDD) system relative complex, so in order to reduce interference, the TDD system introduces the notion of uplink synchronous.
The physical channel of TD-SCDMA system is made of radio frames, and each radio frames is divided into two continuous subframes again, and each subframe is made up of seven business time-slots of up-downgoing and three special time slots.The structure of subframe as shown in Figure 1, the 0th time slot fixed allocation given descendingly in seven business time-slots, it is up that the 1st time slot fixed allocation given, remaining time slot can distribute arbitrarily between up-downgoing.Three special time slots of oblique line filling part are respectively descending pilot frequency time slot (DwPTS), uplink pilot time slot (UpPTS), and protection time slot (GP).Wherein, the DwPTS time slot is used for sending descending synchronous code, finishes down-going synchronous; The UpPTS time slot is used for sending uplink synchronous code, finishes initial uplink synchronous.Because employed descending synchronous code has only one in each sub-district, its corresponding eight different uplink synchronous code, this corresponding relation is determined.And, when the user is in idle condition, need to keep down-going synchronous and broadcast listening information, and from available uplink synchronous code one of picked at random, it is synchronous to be used for initial uplink.
Referring to shown in Figure 2, the initial uplink synchronizing process in the TD-SCDMA system is as follows:
Step 201, base station send DwPTS to user terminal, and user terminal is finished down-going synchronous according to descending synchronous code after obtaining descending synchronous code.
The process of down-going synchronous is set up in step 201～202nd.Down-going synchronous is the prerequisite of uplink synchronous, and after user terminal start, it must at first set up down-going synchronous with the sub-district, and only after setting up down-going synchronous, could begin to set up uplink synchronous.
Step 203, user terminal send UpPTS to the base station.
The transmitting power and the transmitting time adjustment information of physical access channel (FPACH) informing user terminal passed through in step 205, base station.
At present, people are more and more higher to the requirement of communication system, and have been not content with by the personal computer access network, but wish can both receive such as send Email in any place, carry out data services such as network browsing and file download.Therefore, wireless communication system develops into 3-G (Generation Three mobile communication system) (3G) from the analog communication system of frequency division multiple access (FDMA), the business of supporting also develops into the mixed business of present data and speech gradually from simple voice service, until data service at a high speed.Yet present TD-SCDMA system can not support high-speed data service, because the difference of transfer of data and voice transfer is: during the transmission data, to the requirement reduction of real-time, but the requirement of data transmission quality is improved.Therefore, in order to guarantee the quality of transfer of data, just more resources must be used to transmit data, with less resource transmission control information.
Summary of the invention
In view of this, the system based on the support high speed data transfer of TDD system has been proposed, referring to shown in Figure 6 in another patent application, in this system, with 128 subframes as a control cycle, wherein, last eight concentration of transmissions that subframe is used for carrying out control information specially.In order to guarantee the accurate transmission of control information, adopted coded system efficiently, the control information of system is concentrated transmit, to reduce taking of transmission control resource, can form a kind of high speed data transmission system of optimization like this.
Based on the said system design, the present invention proposes initial uplink method for synchronous at a kind of tdd systems, make it under the situation of control information concentration of transmissions, it is synchronous that the user sets up initial uplink.
A kind of initial uplink method for synchronous of tdd systems, be applied to it is characterized in that in the high speed data transmission system, time period T1 and time period T2 are set in each control cycle, and time period T2 is arranged at after the time period T1, and this method is further comprising the steps of:
A. each user terminal obtains the descending synchronous code that network side sends, and sets up down-going synchronous with network side;
B. according to the descending synchronous code that obtains in the steps A, and descending synchronous code obtains all corresponding uplink synchronous codes with the corresponding relation of uplink synchronous code, user terminal is spendable uplink synchronous code of picked at random from all uplink synchronous codes, sends the uplink synchronous code that this is chosen to network side in time period T1;
C. after network side is received the uplink synchronous code of user terminal transmission, time and power according to this uplink synchronous code that receives, estimate the adjustment parameter of institute's respective user terminal uplink synchronous, the uplink synchronous of all user terminals that will estimate adjustment parameter is broadcasted to all user terminals in time period T2 then;
D. after each user terminal is received the uplink synchronous adjustment parameter that network side sent among the step C, whether judge wherein has the uplink synchronous of issuing oneself to adjust parameter, if do not have, then this uplink synchronization request failure, execution in step B, otherwise, therefrom find out network and issue the uplink synchronous adjustment information of oneself, adjust the uplink synchronous relevant parameter of self then according to this uplink synchronous adjustment information.
Described time period T2 follows time period T1 a period of time afterwards closely.
Described initial uplink synchronous code is to launch to network side with the Initial Trans of high-rise appointment.
Described control cycle is the time period greater than frame length.
Uplink synchronous described in the step C is adjusted parameter and is comprised uplink synchronous adjustment temporal information and uplink transmission power adjustment information at least.
The uplink synchronous that contains in the broadcast message in the described T2 time period is adjusted the parameter corresponding user terminal: all user terminals or the certain customers' terminal that send uplink synchronous code in the T1 time period.
This method further comprises: set in advance the power ramp factor, after uplink synchronous failure first, the user is when uplink synchronous code transmission subsequently, and all need increases a power ramp factor with transmitted power at every turn.
Set in advance the maximum that a user terminal sends the uplink synchronous code number of times; Described step B further comprises:
User terminal judges whether the number of times that sends uplink synchronous code surpasses maximum, if surpass, the uplink synchronization request failure finish the uplink synchronous flow process, otherwise user terminal resends uplink synchronous code to network side in time period T1.
User terminal resends the uplink synchronous code of selecting at random to network side at every turn.
User terminal resends uplink synchronous code in transmission position selected at random in time period T1 to network side at every turn.
The present invention is applicable to the wireless communication system that requires uplink synchronous, its set time section in a control cycle, by concentrating response in this control cycle, to initiate the user terminal of uplink synchronization request, synchronous with the initial uplink of user terminal and network side in the realization high speed data transfer TDD system.This method can reduce taking of a large amount of downlink resources, and simple, reliable; And this method is concentrated common control information and is sent in time period T2, improve the receptivity of common control information, strengthens the error-correcting performance of common control information.
Description of drawings
Fig. 1 is the subframe structure of TDD system;
Fig. 2 is the uplink synchronous process of TDD system;
Fig. 3 is that control information sends the position in optimizing data transmission system;
Fig. 4 realizes the method that initial uplink is synchronous for the present invention;
Fig. 5 is a schematic flow sheet of setting up the synchronous specific embodiment of initial uplink;
Fig. 6 is the physical layer frame structure schematic diagram of high speed data transmission system.
Embodiment
Core content of the present invention is: in high speed data transfer TDD system, at a control cycle are set two time periods, be respectively time period T1 and time period T2, all send initial uplink and set up the requesting users terminal synchronously, and the uplink synchronous code that it is corresponding sent in the T1 time period; Network side is then concentrated the response that sends uplink synchronization request in the T2 time period.
Referring to shown in Figure 4, the present invention realizes that the method for uplink synchronous may further comprise the steps:
Step 401, user terminal obtain the descending synchronous code that network side sends, and set up down-going synchronous with network side; There are corresponding relation in described descending synchronous code and a plurality of uplink synchronous code;
Step 402, according to the descending synchronous code that obtains in the step 401, from described corresponding relation, obtain uplink synchronous code, at T1 in the time period, spendable uplink synchronous code of each user terminal picked at random, and send to network side;
After step 403, network side are received the uplink synchronous code of user terminal transmission, the time that reaches and received power according to the uplink synchronous code that receives, estimate the adjustment parameter of institute's respective user terminal uplink synchronous, all uplink synchronous that estimate are adjusted parameter carry out Unified coding, in time period T2, concentrate to all user terminal broadcasting;
After step 404, each user terminal receive that the uplink synchronous of network side response user in the step 403 is adjusted parameter, whether judge has the uplink synchronous of issuing oneself to adjust parameter in this response message, if do not have, this uplink synchronization request failure, execution in step 402, otherwise, from broadcast message, find out network and issue the uplink synchronous adjustment information of oneself, adjust the uplink synchronous relevant parameter of self then according to this uplink synchronous adjustment information.
Describe technical scheme of the present invention in detail below in conjunction with the drawings and specific embodiments.
Referring to shown in Figure 3, at T1 in the time period, have initial uplink and set up requesting users transmission uplink synchronization request synchronously, network side utilizes a plurality of users that uplink synchronization request is initiated in response in a plurality of FPACH channel sets in this control cycle in a set time section T2 subsequently.Here, control cycle can be a time period greater than frame length, and time period T2 follows closely after the time period T1.
Need to prove that before the user initiated the initial uplink synchronizing process, user's physical layer need obtain following message from high level or according to preestablishing: the emission maximum number of times of the grade of service, operable uplink synchronous code and uplink synchronous code etc.
Referring to shown in Figure 5, it is as follows that present embodiment is set up the synchronous process of initial uplink:
Step 501, base station send DwPTS to user terminal, and user terminal is finished down-going synchronous according to descending synchronous code after obtaining descending synchronous code.
Step 502, user terminal obtain available uplink synchronous code according to the corresponding relation between the uplink and downlink synchronous code, select one at random according to self grade of service from available uplink synchronous code then.
Step 503, user terminal be at the appointed time in the section T1, with Initial Trans selected uplink synchronous code in base station step 502.
After the uplink synchronous code of user terminal transmission is received in step 504, base station, according to time that receives uplink synchronous code and received power, estimate up transmitting time deviation and uplink transmission power uplink synchronous adjustment such as adjustment information related parameter arranged, then in later time section T2, the adjustment information of uplink synchronous is broadcast to all user terminals by FPACH.
Here, that network side responds can be all users that initiate uplink synchronous in time period T1, also can be the inner user who divides the initiation uplink synchronous of time period T1.
Step 505, user terminal are according to signature, find out the uplink synchronous time adjustment information and the power control information that belong to self, and utilize time adjustment information and the power control information found out to adjust the transmitting time and the transmitted power of uplink synchronization request next time, at this moment, uplink synchronous finishes.
Certainly, if the uplink synchronization request information dropout that user terminal sends, network side will be unable to estimate its parameter so, concentrate the access parameter that does not just comprise this user terminal in the control information that responds, at this moment, user terminal will be initiated uplink synchronization request after finding again, and employed uplink synchronous code and transmission position can be reselected.In addition, system can also further be provided with the maximum that user terminal is initiated the uplink synchronization request number of times, is used to limit the maximum times of continuous initiation uplink synchronization request, and certainly, the number of times that system initiates uplink synchronization request can not surpass this maximum.
By above-mentioned steps as can be seen, the user initiates uplink synchronization request information in a certain set time section T1, after network side is received this request and processing, will in a set time section T2 subsequently, concentrate response to give each user all uplink synchronous adjustment information.For the uplink synchronization request information that time period T1 is sent out can in time be responded, it is time period T2 four subframes before that time period T1 preferably is set, and for the uplink synchronization request beyond the time period T1, system can respond selectively.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1, a kind of initial uplink method for synchronous of tdd systems, be applied in the high speed data transmission system, it is characterized in that, the transmission period of setting fixed number subframe correspondence in system is a control cycle, and time period T1 and time period T2 be set in each control cycle, and time period T2 is arranged at after the time period T1, and this method is further comprising the steps of:
A. each user terminal obtains the descending synchronous code that network side sends, and sets up down-going synchronous with network side;
B. according to the descending synchronous code that obtains in the steps A, and descending synchronous code obtains all corresponding uplink synchronous codes with the corresponding relation of uplink synchronous code, user terminal one of picked at random from all spendable uplink synchronous codes sends the uplink synchronous code that this is chosen to network side in time period T1;
C. after network side is received the uplink synchronous code of user terminal transmission, the time of advent and received power according to this uplink synchronous code that receives, estimate the adjustment parameter of institute's respective user terminal uplink synchronous, the uplink synchronous of all user terminals that will estimate adjustment parameter is broadcasted to all user terminals in time period T2 then;
D. after each user terminal is received the uplink synchronous adjustment parameter that network side sent among the step C, whether judge wherein has the uplink synchronous of issuing oneself to adjust parameter, if do not have, then this uplink synchronization request failure, execution in step B, otherwise, therefrom find out network and issue the uplink synchronous adjustment information of oneself, adjust the uplink synchronous relevant parameter of self then according to this uplink synchronous adjustment information.
2, method according to claim 1 is characterized in that, described time period T2 follows time period T1 a period of time afterwards closely.
3, method according to claim 1 is characterized in that, described initial uplink synchronous code is to launch to network side with the Initial Trans of high-rise appointment.
4, method according to claim 1 is characterized in that, described control cycle is the time period greater than frame length.
5, method according to claim 1 is characterized in that, the uplink synchronous described in the step C is adjusted parameter and comprised uplink synchronous adjustment temporal information and uplink transmission power adjustment information at least.
6, method according to claim 1 is characterized in that, the uplink synchronous that contains in the broadcast message in the described T2 time period is adjusted the parameter corresponding user terminal and is: all user terminals or the certain customers' terminal that send uplink synchronous code in the T1 time period.
7, method according to claim 1, it is characterized in that this method further comprises: set in advance the power ramp factor, after uplink synchronous failure first, the user is when uplink synchronous code transmission subsequently, and all need increases a power ramp factor with transmitted power at every turn.
8, method according to claim 1 is characterized in that, sets in advance the maximum that a user terminal sends the uplink synchronous code number of times; Described step B further comprises:
User terminal judges whether the number of times that sends uplink synchronous code surpasses maximum, if surpass, the uplink synchronization request failure finish the uplink synchronous flow process, otherwise user terminal resends uplink synchronous code to network side in the time period of next control cycle T1.
9, method according to claim 8 is characterized in that, user terminal resends the uplink synchronous code of selecting at random to network side at every turn.
10, method according to claim 9 is characterized in that, the transmission position that user terminal is selected in time period T1 at every turn at random resends uplink synchronous code to network side.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031213537A CN100558019C (en) | 2002-10-23 | 2003-03-26 | A kind of initial uplink method for synchronous of tdd systems |
| PCT/CN2004/000018 WO2004086780A1 (en) | 2003-03-26 | 2004-01-06 | Method for initial uplink synchronization in tdd system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02145920.7 | 2002-10-23 | ||
| CN02145920 | 2002-10-23 | ||
| CNB031213537A CN100558019C (en) | 2002-10-23 | 2003-03-26 | A kind of initial uplink method for synchronous of tdd systems |
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| CN1492605A true CN1492605A (en) | 2004-04-28 |
| CN100558019C CN100558019C (en) | 2009-11-04 |
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| CNB031213537A Expired - Fee Related CN100558019C (en) | 2002-10-23 | 2003-03-26 | A kind of initial uplink method for synchronous of tdd systems |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388647C (en) * | 2004-07-29 | 2008-05-14 | 华为技术有限公司 | Method for up going synchronization and accessing customer equipment in multicarrier system |
| CN1855767B (en) * | 2005-04-18 | 2010-10-06 | 大唐移动通信设备有限公司 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
| CN101193416B (en) * | 2006-11-24 | 2011-05-04 | 大唐联诚信息系统技术有限公司 | A random access method and base station and user terminal using this method |
| CN101282141B (en) * | 2007-04-05 | 2012-06-06 | 华为技术有限公司 | Method, apparatus and system for transmitting and receiving data |
| CN101425889B (en) * | 2007-10-30 | 2013-01-23 | 电信科学技术研究院 | Synchronization method and system in non-scheduling transmission |
| CN103795434A (en) * | 2010-10-21 | 2014-05-14 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN104052570A (en) * | 2013-03-15 | 2014-09-17 | 华为技术有限公司 | Information transmission method based on time division duplex and devices |
| WO2015089833A1 (en) * | 2013-12-20 | 2015-06-25 | Nokia Technologies Oy | Cross-carrier scheduling and acknowledgment transmission |
-
2003
- 2003-03-26 CN CNB031213537A patent/CN100558019C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388647C (en) * | 2004-07-29 | 2008-05-14 | 华为技术有限公司 | Method for up going synchronization and accessing customer equipment in multicarrier system |
| CN1855767B (en) * | 2005-04-18 | 2010-10-06 | 大唐移动通信设备有限公司 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
| CN101193416B (en) * | 2006-11-24 | 2011-05-04 | 大唐联诚信息系统技术有限公司 | A random access method and base station and user terminal using this method |
| CN101282141B (en) * | 2007-04-05 | 2012-06-06 | 华为技术有限公司 | Method, apparatus and system for transmitting and receiving data |
| CN101425889B (en) * | 2007-10-30 | 2013-01-23 | 电信科学技术研究院 | Synchronization method and system in non-scheduling transmission |
| CN103795434A (en) * | 2010-10-21 | 2014-05-14 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN104052570A (en) * | 2013-03-15 | 2014-09-17 | 华为技术有限公司 | Information transmission method based on time division duplex and devices |
| CN104052570B (en) * | 2013-03-15 | 2017-08-18 | 华为技术有限公司 | A kind of information transferring method and equipment based on time division duplex |
| WO2015089833A1 (en) * | 2013-12-20 | 2015-06-25 | Nokia Technologies Oy | Cross-carrier scheduling and acknowledgment transmission |
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| CN100558019C (en) | 2009-11-04 |
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