CN101056136B - Method for expanding the uplink synchronization range in the TD-SCDMA mobile communication system - Google Patents
Method for expanding the uplink synchronization range in the TD-SCDMA mobile communication system Download PDFInfo
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- CN101056136B CN101056136B CN2006100728993A CN200610072899A CN101056136B CN 101056136 B CN101056136 B CN 101056136B CN 2006100728993 A CN2006100728993 A CN 2006100728993A CN 200610072899 A CN200610072899 A CN 200610072899A CN 101056136 B CN101056136 B CN 101056136B
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Abstract
The present invention relates a TD-SCDMA mobile communication system, and discloses a method of extending the up synchronization range in the TD-SCDMA mobile communication system to solve the problem that the interface range of the TD-SCDMA system is small. In the TD-SCDMA multi-carrier system according to the present invention, the frame format of the secondary carrier is adjusted simply and theUE up synchronization is performed to the frame structure improved on the basis of the secondary carrier to enlarge the original protection interval from 96bit to 192bit, thus, the up synchronizationrange is doubled; otherwise, the protection interval can be enlarged to 864 bit, then the biggest up synchronization range of the TD-SCDMA is increased by 9 times.
Description
Technical field
The present invention relates to a kind of wireless communication technology, particularly a kind of wireless access (Radio Access) technology relates to the method that enlarges the uplink synchronous scope in a kind of TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) mobile communication system specifically.
Background technology
At present, the whole world representational 3-G (Generation Three mobile communication system) wave point (Radio Interface) standard has three kinds of WCDMA (Wideband Code Division Multiple Access (WCDMA) accesss), CDMA2000 (code division multiple access access 2000) and TD-SCDMA, and they are all write 3G (Third Generation) Moblie technological guidance property file by International Telecommunication Association (ITU).Three big each tool advantage of standard, and formed industry alliance alone.
WCDMA and cdma2000 adopt FDD (Frequency Division Duplexing (FDD)) pattern, and TD-SCDMA adopts TDD (time division duplex) pattern.FDD is the dual-mode that the transmission of up (transmission) and descending (reception) is used two symmetrical frequency bands that separate, need paired frequency, distinguish uplink and downlink by frequency, can make full use of the frequency spectrum of up-downgoing for symmetrical service (as voice), but during for asymmetrical packet switched data service (as the Internet), because ascending load is low, the availability of frequency spectrum then reduces greatly.TDD is the dual-mode that the transmission of uplink and downlink is used identical frequency band, distinguish uplink and downlink and switch according to the time, the time slot of physical layer is divided into uplink and downlink two parts, do not need paired frequency, the professional shared same channel of uplink downlink, can unequally distribute, be specially adapted to asymmetrical packet switched data service (as the Internet).The availability of frequency spectrum height of TDD, and with low cost.
The frame of TD-SCDMA system adopts 3-tier architecture: radio frames (Radio Frame), subframe (Sub-frame), time slot (Slot), as shown in Figure 1.A wireless frame length 10ms, it is divided into the subframe of two 5ms again.Each subframe is made of 7 main time slots (length 675us) and 3 special time slots, comprises ascending time slot and descending time slot in 7 main time slots, represents with upward arrow among the figure and following arrow respectively; 3 special time slots are downward guide time slot (DwPTS), up guide time slot (UpPTS) and protection (GP) at interval, and wherein downward guide time slot and up guide time slot also can be called downlink synchronization slot and uplink synchronous time slot.In 7 main time slots, time slot 0 (TS0) generally is used for descending, uses as Cell Broadcast CB; Time slot 1 (TS1) generally is used for up.
In the TD-SCDMA system, a complete access procedure can be divided into that down-going synchronous is caught, system information reads, set up uplink synchronous, insert four processes at random.Be summarized as follows respectively:
1. down-going synchronous is caught
The first step of subscriber equipment (UE) connecting system is the down-going synchronous of acquisition and current area.This process is to realize by the SYNC_DL (descending synchronous code) that catches among the cell downlink synchronization slot DwPTS.In the DwPTS time slot, the every 5ms of SYNC_DL sign indicating number sends once, has 32 groups of SYNC_DL in the TD-SCDMA system, and this code word has orthogonality preferably each other.Subscriber equipment can obtain correlation peak by receiving this code word, determines the descending timing of current area with this.
2. system information reads
System information periodically goes up at BCH (broadcast channel) and broadcasts to subscriber equipment, and BCH is a transmission channel (Transport Channel), and it is mapped to P-CCPCH (main Common Control Physical Channel) physical channel.P-CCPCH transmits in TS0.After catching, down-going synchronous just can obtain scrambler (Scrambling code) information that current area is used.Above-mentioned information has been arranged, and UE just can finish detection and the decoding to system for transmitting message among the P-CCPCH, thereby understands system information, obtains UE and further operate needed relevant information in system.Information such as Physical Random Access Channel (P-RACH) and physical access channel (F-PACH) resource for example.
3. uplink synchronisation
After UE on the down link and current area obtain synchronously, when UE need be when current area Node B (Node B) sends signal, because now UE also and do not know distance between itself and the current area Node B, send signal for fear of UE in inappropriate time, UE at first to carry out and Node B between uplink synchronous.Being based upon at random of uplink synchronous finished in access (Random Access) process.
UE at first sends SYNC_UL (uplink synchronous code) to Node B in the UpPTS time slot.Node B just can obtain timing and the power information of SYNC_UL, and determine transmitted power and time adjusted value that UE should use thus, and a certain subframe in ensuing 4 subframes sends to UE by the F-PACH channel after receiving the SYNC_UL of UE transmission.UE adjusts its transmitting time and transmitted power after receiving these adjusted value information on the F-PACH, and then the uplink synchronous between foundation and the Node B.
4. random access procedure
UE according to wherein said transmitting time and power adjustment, sets the transmitting time and the transmitted power of its P-RACH channel after receiving the F-PACH channel; Send RRC (Radio Resource control) connection to Node B and set up request message in the P-RACH channel, request is set up RRC with system and is connected, and then finishes random access procedure.
Then, progressively finish authentication, encryption, setup requests processes such as (Setup) between UE and the system.
About the detailed description of described transmission channel, physical channel and access procedure sees also 3-G (Generation Three mobile communication system) normative document 3GPP TS 25.221 and 3GPP TS 25.224.
From the frame structure of aforementioned TD-SCDMA system as can be seen, between downlink synchronization slot and uplink synchronous time slot, has a segment protect at interval.In existing TD-SCDMA system standard, this segment protect length at interval is 96 chips (chip).Because the carriers rate of TD-SCDMA system is 1.28MHz, electromagnetic transmission speed V is 3 * 10
8Meter per second, then the pairing electromagnetic wave propagation distance L of 96 chips is: L=V * 96/ (1.28 * 10
6)=22.5 kilometer.Consider the round propagation delay (Round trip delay) of wireless signal, when that is to say that distance as UE and Node B is in 11.25 kilometers, UE just can set up uplink synchronous with Node B.If the distance of UE and Node B is greater than 11.25 kilometers, UE just can't normally insert.
Therefore, to have limited the access scope of TD-SCDMA system maximum be 11.25 kilometers to the frame structure in the existing TD-SCDMA system.This also is the wretched insufficiency part that two kinds of standards of TD-SCDMA and other are compared.Restricted the application of TD-SCDMA system.
Summary of the invention
In view of this, main purpose of the present invention is to overcome TD-SCDMA system access scope and has only 11.25 kilometers restriction.
To achieve these goals, the invention provides the method that enlarges the uplink synchronous locking range in a kind of TD-SCDMA mobile communication system, in a described intrasystem multi-carrier district, on at least one auxilliary carrier wave of described sub-district, descending pilot frequency time slot and protection are thereafter merged at interval, form new protection at interval;
Wherein, the carrier wave that carries the BCH channel in the described multi-carrier district is a main carrier, and other carrier waves are auxilliary carrier wave;
When UE inserts described multi-carrier district, carry out down-going synchronous by main carrier and catch with system information and read, comprise the relevant information of cell carrier in the described system information;
Based on new protection interval and the uplink synchronous time slot thereafter after merging on the auxilliary carrier wave, the uplink synchronous between UE foundation and Node B.
The method according to this invention at least one auxilliary carrier wave of described sub-district, after descending pilot frequency time slot and thereafter protection are merged at interval, further merges time slot 0 with it, forms new protection interval; Based on new protection interval and the uplink synchronous time slot after merging, the uplink synchronous between UE foundation and Node B.
The method according to this invention, on the main carrier of sub-district, based on original protection interval and uplink synchronous time slot, the uplink synchronous between UE foundation and Node B.
Technical scheme major technique characteristics of the present invention are, the TD-SCDMA frame structure on the auxilliary carrier wave is improved, and make the expanded range that system uplink can be synchronous by the GP after enlarging.Wherein, only merge at interval with thereafter protection by the downlink synchronization slot that will assist on the carrier wave; form new protection at interval; and do not increase just make under the consumption situation of Radio Resource of system whole system the access expanded range one times; make the normal access scope of TD-SCDMA system expand 22.5 kilometers to from 11.25 kilometers, and the resource of the TS0 time slot of auxilliary carrier wave can normally be used.Further; to assist after downlink synchronization slot on the carrier wave merges at interval with thereafter protection; TS0 is merged with it again; form new protection at interval; with the TD-SCDMA system can insert expanded range normally 9 times, make the inserted scope of TD-SCDMA system expand 101.25 kilometers to from 11.25 kilometers.Broken through completely and for a long time perplexed TD-SCDMA always and can insert the little technical bottleneck of scope.
Technical scheme of the present invention is simple, realizes easily, and is significant.Made full use of the resource of TD-SCDMA system.Especially under the multicarrier situation, the resource that auxilliary carrier wave is underused.
Description of drawings
Fig. 1 is a TD-SCDMA frame structure schematic diagram;
Fig. 2 is the TD-SCDMA frame structure schematic diagram on the auxilliary carrier wave in according to a particular embodiment of the invention;
Fig. 3 is the TD-SCDMA frame structure schematic diagram on the auxilliary carrier wave in two according to a particular embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Basic ideas of the present invention are based on the multi-carrier district notion of the TD-SCDMA system of recent proposition, are utilized as the main carrier and the auxilliary carrier wave of cell configuration, finish access procedure jointly.By the frame structure on the subcarrier is adjusted, enlarge uplink synchronous time slot GP length before, thereby make the expanded range of uplink synchronous.Overcome the original technical bottleneck of TD-SCDMA.
In the multi-carrier TD-SCDMA system notion of coming in to propose, a sub-district will no longer only be configured to a single carrier, but can be configured to a plurality of carrier waves, as two or more carrier waves.Wherein, the carrier wave that carries the BCH channel is called as main carrier, and all the other carrier waves are called as auxilliary carrier wave.Under such multicarrier system notion, a multi-carrier district can provide about N doubly to the peak data rate of single-carrier cell, and wherein N is the number of the supported carrier wave in sub-district, thereby can significantly improve data throughout and spectrum efficiency in the sub-district.
The method according to this invention, in the specific embodiment of the invention one, the frame structure after adjusting on the auxilliary carrier wave as shown in Figure 2.
In this embodiment, descending pilot frequency time slot and original thereafter protection on the auxilliary carrier wave merge at interval, form new protection at interval.
New GP length is 192 chips, has increased by 96 chips than original GP, and whole access procedure is similar to aforementioned access procedure, and down-going synchronous is caught to read on the main carrier with system information and finished.
Down-going synchronous is caught by sending descending synchronous code in the DwPTS time slot on main carrier and is undertaken, and concrete synchronizing process as previously mentioned.
After down-going synchronous was caught, UE obtained system message by the BCH channel that receives on the main carrier, and and then the relevant required information of access of acquisition.It should be noted that to comprise the relevant information of cell carrier in the system information this moment, as being the frequency point information of the carrier wave that the sub-district disposed.Also will contain the relevant information of assisting carrier wave accordingly, with in the system informations such as resource that insert relevant F-PACH, P-RACH and S-CCPCH.
According to relevant system information, UE can utilize the uplink synchronous time slot on the auxilliary carrier wave to send SYNC_UL and Node B carries out uplink synchronous.The transmitting time of uplink synchronous code will with existing uplink synchronous process in different.In the uplink synchronous process in the prior art, UE is behind the descending synchronous code of receiving Node B, and UE just sends uplink synchronous code.According to the far and near distance difference of UE from Node B, uplink synchronous code can be 96 chips by the normal excursion that receives of Node B, i.e. GP length before the uplink synchronous time slot.And in according to a particular embodiment of the invention, owing to used the frame structure after improving on the auxilliary carrier wave to carry out uplink synchronous, uplink synchronous code can have been reached 192 chips, promptly new GP length by the normal excursion that receives of Node B.Thus, pairing electromagnetic wave propagation distance L will expand as: L=V * 192/ (1.28 * 10
6)=45 kilometer.Consider the round propagation delay of wireless signal, when that is to say that distance as UE and Node B is in 22.5 kilometers, UE can set up uplink synchronous with Node B.
Uplink synchronous is finished whole access procedure after setting up then.
According to a particular embodiment of the invention in one, only changed the purposes of idle downlink synchronization slot on the auxilliary carrier wave, itself and uplink synchronous time slot GP are before merged, utilized the Radio Resource of system fully, access process does not become substantially, but the access scope that the distance that UE can normally insert is compared and had now in the TD-SCDMA system is extended one times, and scheme is simple.Significant.
The method according to this invention, in the specific embodiment of the invention two, the frame structure after adjusting on the auxilliary carrier wave as shown in Figure 3.
In this embodiment, TS0, descending pilot frequency time slot and GP on the auxilliary carrier wave merge, and form new GP.
New GP length is 864 chips, has increased by 768 chips than original GP, and whole access procedure is similar to aforementioned access procedure, and down-going synchronous is caught to read on the main carrier with system information and finished.
Down-going synchronous is caught by sending descending synchronous code in the DwPTS time slot on main carrier and is undertaken, and concrete synchronizing process as previously mentioned.
After down-going synchronous was caught, UE obtained system message by the BCH channel that receives on the main carrier, and and then the relevant required information of access of acquisition.To comprise the relevant information of cell carrier this moment in the system information, as frequency point information.Also will contain the relevant information of assisting carrier wave accordingly, with in the system informations such as resource that insert relevant F-PACH, P-RACH and S-CCPCH.
According to relevant system information, UE can utilize the uplink synchronous time slot on the auxilliary carrier wave to send SYNC_UL and Node B carries out uplink synchronous.Owing to used the frame structure after improving on the auxilliary carrier wave to carry out uplink synchronous, uplink synchronous code can be reached 864 chips, promptly new GP length by the normal excursion that receives of Node B.Thus, pairing electromagnetic wave propagation distance L will expand as: L=V * 864/ (1.28 * 10
6)=202.5 kilometer.Consider the round propagation delay of wireless signal, when that is to say that distance as UE and Node B is in 101.25 kilometers, UE can set up uplink synchronous with Node B.
Uplink synchronous is finished whole access procedure after setting up then.
According to a particular embodiment of the invention in two, the UE normally scope of connecting system is further expanded to 101.25 kilometers, has increased the normal access scope of TD-SCDMA system greatly, lays a good foundation for the TD-SCDMA system realizes wide the covering.
In according to a particular embodiment of the invention, frame structure on the cell main carrier is not subjected to any change, UE still can utilize the uplink synchronous time slot on the main carrier to carry out and Node B between uplink synchronous, therefore, the method according to this invention also can be supported the UE in the existing TD-SCDMA system, makes the TD-SCDMA system that has implemented according to the inventive method have compatibility to the UE in the existing TD-SCDMA system.
Claims (3)
1.TD-SCDMA enlarge the method for uplink synchronous scope in the mobile communication system, it is characterized in that in a described intrasystem multi-carrier district, on at least one auxilliary carrier wave of described sub-district, descending pilot frequency time slot and protection are thereafter merged at interval, form new protection at interval; Wherein, the carrier wave that carries the BCH channel in the described multi-carrier district is a main carrier, and other carrier waves are auxilliary carrier wave;
When UE inserts described multi-carrier district, carry out down-going synchronous by main carrier and catch with system information and read, comprise the relevant information of cell carrier in the described system information; Based on new protection interval and the uplink synchronous time slot thereafter after merging on the auxilliary carrier wave, the uplink synchronous between UE foundation and Node B.
2. method according to claim 1 is characterized in that at least one auxilliary carrier wave of described sub-district, after descending pilot frequency time slot and thereafter protection are merged at interval, further time slot 0 is merged with it, forms new protection interval; Based on new protection interval and the uplink synchronous time slot after merging, the uplink synchronous between UE foundation and Node B.
3. method according to claim 1 is characterized in that on the main carrier of sub-district, based on original protection interval and uplink synchronous time slot, and the uplink synchronous between UE foundation and Node B.
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| CN101159478B (en) * | 2007-10-29 | 2012-12-19 | 中兴通讯股份有限公司 | Physical accidental channel transmitting method |
| US8184599B2 (en) * | 2008-06-23 | 2012-05-22 | Qualcomm Incorporated | Management of UE operation in a multi-carrier communication system |
| CN101719786A (en) * | 2008-10-09 | 2010-06-02 | 华为技术有限公司 | Synchronous method, synchronous terminal and communication system |
| CN102045781B (en) * | 2009-10-14 | 2013-09-11 | 电信科学技术研究院 | Method, system and devices for scheduling terminal |
| CN102111846A (en) * | 2009-12-29 | 2011-06-29 | 上海无线通信研究中心 | Method for resolving uplink physical random access channel (PRACH) resource congestion in multicarrier system |
| CN102164398B (en) * | 2010-02-22 | 2014-01-08 | 鼎桥通信技术有限公司 | Scheduling method |
| CN102238721B (en) * | 2010-04-29 | 2015-11-25 | 联芯科技有限公司 | terminal synchronous timing control method and device |
| CN103368636B (en) * | 2012-03-26 | 2016-03-23 | 鼎桥通信技术有限公司 | A kind of method and apparatus merging upward signal |
| CN103582111A (en) * | 2012-07-27 | 2014-02-12 | 联芯科技有限公司 | Non-main carrier downlink synchronization method and device |
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| CN1719932A (en) * | 2004-07-09 | 2006-01-11 | 中兴通讯股份有限公司 | Random access method of multi-carrier covering of TD-SCDMA system |
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