CN1497882A - Random insertion method fortime-division duplex system - Google Patents
Random insertion method fortime-division duplex system Download PDFInfo
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- 238000012546 transfer Methods 0.000 claims description 9
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Abstract
A random access method for the high-speed data transmission of time division duplex (TDD) system features that sequential 3 time slot (T1, T2 and T3) are set up for each control period, and in the TDD system, the up-line synchronous codes for the user terminals sending random access request are transmitted in the time slot T1, the acknowledgements of network to said random access request are transmitted in the time slot T2, and sending the random access information in the time slot T3 by the user terminal which has the relative access information in the received acknowledgement. Its advantages are high utilization rate of resource, and high reliability.
Description
Technical field
The present invention relates to the access technology at random in the mobile communication system, be meant the method that user terminal inserts at random in time division duplex (TDD) system in high speed data transfer especially.
Background technology
TD SDMA (TD-SCDMA) system is based on the technology of time division duplex (TDD), and this system adopts the different time-gap at same frequency channels to receive and transmit data.
As shown in Figure 1, the physical channel of TD-SCDMA comprises three-decker: ground floor is a radio frames, and the second layer is a subframe, and the 3rd layer is time slot.Specifically, physical channel is made up of several radio frames, and a radio frames is 10ms, and each radio frames is divided into the subframe of continuous two 5ms again, and each subframe comprises seven business time-slots and three special time slots again.
As shown in Figure 2, the 0th time slot fixed allocation is to descending in seven business time-slots, and the 1st time slot fixed allocation is to up, and 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, and it is synchronous to finish initial uplink.In the TDD system, contain 32 kinds of descending synchronous code sequences altogether, each sub-district can be used wherein a kind of, corresponding eight the different uplink synchronous code sequences (SYNC-UL) of each descending synchronous code sequence.
When user terminal was in idle condition, when just not having service interaction with the base station, the user can keep down-going synchronous and broadcast listening information, and learnt eight SYNC-UL of its correspondence from the SYNC-DL of current use.Insert the user terminal that is meant in the mobile communication system at random, do not having under the situation of private resource, tie up a kind of mode of system's public resource to some control information of base station transmits and small data packets by random fashion.
Referring to shown in Figure 3, the detailed process that the TD-SCDMA system user terminal inserts at random is as follows:
Step 301, 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, then according to the corresponding relation between the uplink and downlink synchronous code, obtains operable uplink synchronous code.
Step 303, send uplink synchronous code (SYNC-UL) to the base station by the UpPCH subchannel.
After the uplink synchronous code of user terminal transmission is received in step 304, base station, measure the first footpath time of the UpPCH that receives and the deviation between the reference time, estimate the up transmitting time of this user's correspondence and the adjustment information of transmitting power.
Position and power and time adjustment parameter information that step 305, base station notify the user to send random access information by physical access channel (FPACH).Here, comprise among the FPACH that frame number between the subframe that numbering, the present frame of confirming UpPCH confirm that relatively UpPCH is detected is poor, the starting position that receives UpPCH, the information such as transmitting power adjustment of RACH message.
After step 306, user terminal are received the FPACH of base station transmission,, adjust the transmitting power and the transmitting time of random access information according to adjusting parameter information.
Step 307, user terminal are in the position of determining, with adjusted power and timed sending random accessing message, i.e. RACH message.
In the said process, between uplink synchronous code sequence and the FPACH, the corresponding relation criterion between FPACH and the random access channel resource is made an appointment, and determines so send the position of RACH message.
In order further to improve access efficiency, can set in advance emission maximum number of times, Initial Trans and the power ramp factor " Pow_Ramp_Step " etc. of UpPCH.
In said process, it is to launch UpPCH with Initial Trans that user terminal is launched first, if user terminal is not received effective response within the scheduled time, user terminal is that step-length increases the signature transmitting power with soaring factor Pow_Ramp_Step then, and the retransmission counter of will signing subtracts 1, if counter is still greater than 0, then turn back to step 303, emission once more, otherwise, access failure at random reported once to high level.Certainly, emitting times can not surpass the emission maximum number of times of agreement in advance.Signature described here is meant the uplink synchronous code sequence.
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.During the transmission data, lower to the requirement of real-time, but having relatively high expectations to data transmission quality.Therefore, in order to guarantee the quality of transfer of data, just more resources must be used to transmit data, the resource of leaving the control information transmission for is less.
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 the resource of transmission control resource occupation, optimize high speed data transmission system.
Based on the said system design, the invention provides a kind of accidental access method of tdd systems of high speed data transfer, insert so that user terminal can be finished at random fast, and improve the resource utilization of radio data system.
A kind of accidental access method of tdd systems, be applied in the high speed data transfer tdd systems, it is characterized in that, time period T1, time period T2 and time period T3 are set in each control cycle, and time period T2 is arranged at after the time period T1, time period T3 is arranged at after the time period T2, 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. obtain all corresponding uplink synchronous codes according to the descending synchronous code and the descending synchronous code that obtain with the corresponding relation of uplink synchronous code, spendable uplink synchronous code of user terminal picked at random utilizes selected uplink synchronous code to send the request that inserts at random to network side in time period T1;
C. after network side is received the request of access at random of user terminal transmission, according to time of reception and power, estimate the access parameter of respective user terminal, all that will estimate in time period T2 insert users' access parameter and concentrate to all user terminals broadcasting;
D. after each access user terminal was received all access parameters, the uplink synchronous code that adopts according to oneself was judged the access parameter that wherein whether contains self correspondence, if no, this is access failure at random, returns step B, otherwise, take out the access parameter of self correspondence; According to the access parameter of self correspondence, in time period T3, send random access information to network side.
Set in advance a user terminal and send the maximum that inserts request number of times at random; Described step B further comprises:
User terminal judges that whether send the number of times that inserts request at random surpasses maximum, if surpass, inserts the request failure at random, finish access process at random, otherwise in time period T1, user terminal utilizes selected uplink synchronous code to send to network side and inserts solicited message at random.
The described solicited message that inserts is at random launched to network side with Initial Trans first.
This method further comprises: set in advance the power ramp factor, first at random behind the access failure, the user is when the request of access at random that sends subsequently, and all need increases a power ramp factor with transmitted power at every turn.
The described solicited message that inserts at random is ascending pilot channel (UpPCH) emission that user terminal passes through to select at random.
Described access parameter comprises position, time adjustment and the power adjustment information that sends Random Access Channel (RACH) message.
The location parameter of described RACH message is dynamically specified by network side.
The each uplink synchronous code of selecting at random of user terminal utilization sends to network side and inserts solicited message at random.
Method of the present invention is the request of access at random of concentrating all users of response in a period of time, inserts at random with the user who is implemented in the high speed data transfer TDD system, and it has following advantage and characteristics:
1) the present invention can reduce taking of a large amount of downlink resources, and simple, reliable;
2) method of the present invention is the common control information Unified coding, and concentrates in time period T2 and send, and improved the receptivity of common control information, strengthened the error-correcting performance of common control information;
3) the present invention concentrates response message time period T1 before to send concentrated being limited in of solicited message of inserting at random in the control cycle, and the position limit of the random access information that the user is sent subsequently is in the time period T3 that follows closely after concentrating response message, and is effective with timing adjustment and the power adjustment about the random access information of user's transmission that guarantee that the base station makes on the basis of inserting solicited message at random that the user sends.
Description of drawings
Fig. 1 is the physical channel structure schematic diagram in the TD-SCDMA system;
Fig. 2 is the structural representation of subframe in the TD-SCDMA system;
The schematic flow sheet that Fig. 3 inserts at random for existing TD-SCDMA system user terminal;
Fig. 4 is the schematic diagram of control cycle in the high speed data transmission system of optimizing;
Fig. 5 realizes the schematic flow sheet that user terminal inserts at random for the present invention;
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, in high speed data transfer TDD system, at each control cycle are set three time periods, be respectively time period T1, time period T2 and time period T3, all transmissions insert the requesting users terminal at random, and the uplink synchronous code that it is corresponding sent in the T1 time period; Network side is then concentrated in the T2 time period and is sent inserting request responding at random; After user terminal is received access information, in the time period, send random access information at the T3 of next control cycle.Here, control cycle can be a time period greater than frame length, and the setting of these three time periods should be able to guarantee that information that network side responds is effective to the transmission of guides user access information.
Referring to shown in Figure 5, realize that method of the present invention may further comprise the steps:
After step 503, network side are received the request of access at random of user terminal transmission, according to time of reception and power, estimate the access parameter of respective user terminal, all users' that will estimate in time period T2 access parameter is concentrated to all user terminal broadcasting;
After step 504, each access user terminal are received all access parameters,, judge the access parameter wherein whether contain self correspondence according to the used uplink synchronous code of self, if no, this is access failure at random, returns step 502, otherwise, take out the access parameter of self correspondence; According to the access parameter of self correspondence, in time period T3, send random access information to network side.
From user side and network side the process that present embodiment inserts is at random described respectively below.
The processing procedure of subscriber terminal side is such:
A., it is that M and signature transmitting power are Sig_Init_Pow that the signature retransmission counter is set.
B. after user terminal obtains descending synchronous code, finish down-going synchronous,, obtain operable uplink synchronous code sequence then according to the corresponding relation between the uplink and downlink synchronous code according to descending synchronous code, and uplink synchronous code sequence of picked at random therefrom.
C. in several frames before the time period of concentrating the transmitting downstream control information, from the UpPCH subchannel that given access service grade can be used, select one at random.
D. launch a signature with selected UpPCH subchannel with the signature transmitting power, this signature is the uplink synchronous code sequence; When the signature transmitting power surpasses the value of maximum permission, then launch this signature with maximum.
E. behind the emission signature, in the time period of the transmitting downstream common control information that follows closely, detect FPACH message, so that obtain network validation.Here, need to judge whether FPACH message is to respond to give local terminal, finding out the relevant FPACH of UpPCH that launches with this user terminal, can number learn by the signature that comprises among the FPACH.
If do not detect effective response within the scheduled time, be that step-length increases the signature transmitting power then with soaring factor Pow_Ramp_Step, and the retransmission counter of will signing subtracts 1, if counter is still greater than 0, then turn back to step c, launch once more in several frames in control cycle subsequently before the time period of concentrated emission control information, otherwise, access failure at random reported once to high level;
If detect effective response within the scheduled time, then the indication according to network among the FPACH is provided with time and power level value, and sends RACH message in the position by corresponding FPACH indication.
The processing procedure of network side is such:
The base station is after receiving an effective signature, the first footpath time of the UpPCH that measurement receives and the deviation between the reference time, estimate the adjustment parameter of respective user terminal launch time and power, and in the time period of the concentrated transmitting downstream control information after following the subframe that receives UpPCH closely, to send the FPACH burst by relevant FPACH, confirm detected signature.Here, comprise the numbering of confirming signature, the starting position that receives UpPCH, the transmitted power level of RACH message, the information such as transmitting site of RACH message among the FPACH.Because the access solicited message of all user terminals in control cycle all is to respond in one concentrated period, should not stipulate the corresponding relation criterion between a kind of FPACH and the PRACH resource in advance, so the transmitting site of RACH message is to be specified by the base station here.
From said process as can be seen, when the repeating transmission number of times is no more than the maximum that sets in advance, if sending, the user inserts the request failure, cause the user can't correctly receive the response message of network side, the user can send the request of access in the next cycle specified location, and, when sending the access request, increase transmitting power next time.Certainly, send used signature of access request and transmission position can be different with this next time.In addition, network side response user's information comprises transmission position, time and the power setting etc. of random access information, and these echo messages can send with other Downlink Control Information.
Need to prove, the transmission in regulation is inserted the access request that sends beyond the T1 time period of signature, do not adopt said process to handle.
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 accidental access method of tdd systems, be applied in the high speed data transfer tdd systems, it is characterized in that, the transmission period of setting fixed number subframe correspondence in system is a control cycle, and time period T1, time period T2 and time period T3 be set in each control cycle, and time period T2 is arranged at after the time period T1, and time period T3 is arranged at after the time period T2, 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. obtain all corresponding uplink synchronous codes according to the descending synchronous code and the descending synchronous code that obtain with the corresponding relation of uplink synchronous code, spendable uplink synchronous code of user terminal picked at random utilizes selected uplink synchronous code to send the request that inserts at random to network side in time period T1;
C. after network side is received the request of access at random of user terminal transmission, according to time of reception and power, estimate the access parameter of respective user terminal, the access parameter of all user terminals that will estimate in time period T2 is concentrated to all user terminals broadcasting;
D. after each access user terminal is received all access parameters,, judge the access parameter wherein whether contain self correspondence according to self used uplink synchronous code, if no, this is access failure at random, returns step B, otherwise, take out the access parameter of self correspondence; According to the access parameter of self correspondence, in time period T3, send random access information to network side.
2, method according to claim 1 is characterized in that, sets in advance a user terminal and sends the maximum that inserts request number of times at random; Described step B further comprises:
User terminal judges whether send the number of times that inserts request at random surpasses maximum, if surpass, insert the request failure at random, finish access process at random, otherwise, in the time period of next control cycle T1, user terminal utilizes selected uplink synchronous code to send to network side and inserts solicited message at random.
3, method according to claim 1 is characterized in that, the described solicited message that inserts is at random launched to network side with Initial Trans first.
4, according to claim 1 or 3 described methods, it is characterized in that this method further comprises: set in advance the power ramp factor, first at random behind the access failure, the user is when the request of access at random that sends subsequently, and all need increases a power ramp factor with transmitted power at every turn.
5, method according to claim 1 is characterized in that, the described solicited message that inserts at random is ascending pilot channel (UpPCH) emission that user terminal passes through to select at random.
6, method according to claim 1 is characterized in that, described access parameter comprises position, time adjustment and the power adjustment information that sends Random Access Channel (RACH) message.
7, method according to claim 6 is characterized in that, the location parameter of described RACH message is dynamically specified by network side.
8, method according to claim 2 is characterized in that, the each uplink synchronous code of selecting at random of user terminal utilization sends to network side and inserts solicited message at random.
9, method according to claim 2 is characterized in that, user terminal resends uplink synchronous code to network side at every turn on selected at random uplink synchronous channel.
10, method according to claim 1 is characterized in that, described control cycle is the time period greater than frame length.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03121343 CN1497882B (en) | 2002-10-23 | 2003-03-26 | Random insertion method fortime-division duplex system |
| PCT/CN2004/000019 WO2004086794A1 (en) | 2003-03-26 | 2004-01-06 | A random access method of tdd system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN02145920.7 | 2002-10-23 | ||
| CN02145920 | 2002-10-23 | ||
| CN 03121343 CN1497882B (en) | 2002-10-23 | 2003-03-26 | Random insertion method fortime-division duplex system |
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| CN1497882A true CN1497882A (en) | 2004-05-19 |
| CN1497882B CN1497882B (en) | 2010-04-07 |
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| WO2007082458A1 (en) * | 2006-01-17 | 2007-07-26 | Shanghai Ultimate Power Communications Technology Co., Ltd. | A method, device, and terminal for physical layer random access in wideband tdd mobile communication system |
| WO2007082407A1 (en) * | 2006-01-18 | 2007-07-26 | Zte Corporation | A random access method for user equipment in time division synchronization code division multiple access communication system |
| CN100411375C (en) * | 2005-03-30 | 2008-08-13 | 华为技术有限公司 | Method for controlling terminal access network |
| CN100461956C (en) * | 2006-01-12 | 2009-02-11 | 华为技术有限公司 | Method for accessing radio communication system using different radom heuristic data pack |
| CN1838574B (en) * | 2005-03-25 | 2010-04-28 | 中兴通讯股份有限公司 | TDD-CDMA system random access method |
| CN101026607B (en) * | 2007-01-23 | 2010-07-07 | 北京天碁科技有限公司 | Common frequency community downlink synchronous code detecting method and device |
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| US9913256B2 (en) | 2007-08-08 | 2018-03-06 | Huawei Technologies Co., Ltd. | Conditional uplink timing alignment in a mobile station device of a radio communication system |
| CN101803252B (en) * | 2007-12-11 | 2013-03-06 | 中兴通讯股份有限公司 | A transmitting method and system for short physical random access channel based on time division duplex system |
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| CN1497882B (en) | 2010-04-07 |
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