CN1457157A - Framing synchronous processing method of inserting channel - Google Patents
Framing synchronous processing method of inserting channel Download PDFInfo
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- CN1457157A CN1457157A CN02160284A CN02160284A CN1457157A CN 1457157 A CN1457157 A CN 1457157A CN 02160284 A CN02160284 A CN 02160284A CN 02160284 A CN02160284 A CN 02160284A CN 1457157 A CN1457157 A CN 1457157A
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Abstract
When a terminal launches an access request to the base station, the signaling information in the access channel is asynchronous transferred i.e. asynchronous access is SCDMA communication system. The method uses synchronous access instead asynchronous access, that is to say the original access frame is sent in two parts in sequences: the access information and the signaling information. The terminal sends the access information first. Then, with the holding control command from the base station being received, the terminal sends the access signaling information at next frame in order to complete the synchronous access.
Description
Technical field
The present invention relates to a kind of S-CDMA (SCDMA) communication system of radio communication, particularly relate to the branch frame synchronization process method of the access channel of SCDMA communication system.
Background technology
In the patent No. is 97118934.X, and denomination of invention has been described a kind of access technology in the patent of " foundation of synchronous code division multiple access communication chain and maintenance method ", and the method that channel inserts in the SCDMA system has been described.In the exemplary embodiments of describing in this patent, the access request signal of access channel and signaling-information send as a frame.In the SCDMA wireless communication system, because the terminal at diverse location place is not also known own distance between nearest base station, so when sending the access request to the base station, signaling information in the access channel is non-synchronous driving, can cause like this and insert difficulty, produce interference simultaneously, influence the speech quality of network on-line user accessed terminal.Owing to insert difficulty, terminal need add high-power simultaneously, inserts again, has increased the power loss of terminal like this.
Summary of the invention
The branch frame synchronization process method of the access channel that the present invention proposes can simply, effectively solve the defective of above-mentioned known technology.This method is to change original asynchronous access into branch frame synchronization to insert, with original access frame, being split into access and signaling information two parts upward sends out successively, terminal at first sends access information, after obtaining the synchronous adjustment instruction of base station, on next frame, send access signaling information, to reach the purpose of synchronous access.
The branch frame synchronization process method of access channel of the present invention, concrete steps comprise:
(1) the up access code sequences Design of wireless channel is become to have the frame structure MUX1UA of protection time slot, synchronization slot 1, empty slot and have the frame structure MUX1UB of empty slot, signalling time slot 1 and protection time slot, descending access code sequences Design becomes to have the frame structure MUX1D that protection time slot, synchronization slot 2, time-delay deviation time slot, power are adjusted time slot, signalling time slot 2 and empty slot;
(2) send out on the terminal access code sequence MUX1UA up, request inserts;
(3) the up access code sequence MUX1UA that sends out is received on the terminal in the base station, according to the deviation and the power of the burst (pseudo noise code, complete 1 sequence) of synchronization slot 1, and the time-delay deviation of computing terminal and ascending power, and adjudicate with this;
(4) by judgement, the base station issues the descending access code sequence of having filled time-delay deviation and ascending power adjusted value, or time-delay deviation is when being invalid value, and it is invalid to announce to insert;
(5) after terminal was received descending access code sequence, by judgement, if effective value, giving out a contract for a project on synchronously contained the up access code sequence MUX1UB in signalling time slot 1; If invalid value, go up again and send out access code sequence MUX1UA up;
(6) after the up access code sequence that comprises the signalling time slot 1 is received in the base station, by judging User PID, issue the descending access code sequence of the admission confirm that comprises the distribution service channel information to the user of correspondence;
(7) terminal switches to Traffic Channel according to the descending access code sequence of admission confirm, finishes access.
By the branch frame synchronization process method of access channel of the present invention, can reduce the difficulty that terminal inserts, make to insert to be more prone to.
Branch frame synchronization process method by access channel of the present invention can reduce the interference to the online user, improves speech quality.
By the branch frame synchronization process method of access channel of the present invention, can reduce the power loss of terminal, prolong the useful life of battery.
Description of drawings
Fig. 1 a is the frame structure of access channel ascending time slot MUX1UA;
Fig. 1 b is the frame structure of access channel ascending time slot MUX1UB;
Fig. 2 is the frame structure of access channel descending time slot MUX1D;
Fig. 3 is the definition block diagram of time-delay deviation time slot;
Fig. 4 is the schematic diagram that inserts synchronously;
Fig. 5 is the flow chart that inserts synchronously;
Fig. 6 is the flow chart of terminal access procedure;
Fig. 7 goes into the flow chart of process for the base station termination;
Fig. 8 a, Fig. 8 b are the schematic diagram that terminal is utilized correlation calculations receive time delay deviation.
Embodiment
Wireless channel has N code channel, comprises M access channel and N-M Traffic Channel (N=32 or 64; M=1 or 2), described code channel distributes, and when N=32 promptly has 32 code channels, because the PSTN incoming end of system can insert 30 code channels, is feasible so above-mentioned code channel distributes.Insert code channel and can be 1 and also can be 2, be i.e. M=1 or 2.Code channel is distinguished by pseudo random sequence, so use two to insert code channel and select synchronism WALSHO and two accesses of WALSH17 differentiation code channels preferably herein.If number of users is many, the quantity of Traffic Channel is had when more being strict with, can selecting one, to insert code channel be M=1, uses the good WALSHO of synchronism to distinguish the access code channel.
In Fig. 1 a; G represents to protect time slot; because the transmitting-receiving conversion needs the regular hour; when terminal is attempted connecting system and do not know distance with system; also just can not keep synchronously with the base station; if there is not guard time, when distant terminal arrived the base station from the base station, the beginning part of upward signal just possibly can't be received in the base station.SYNC1 represents the synchronization slot 1 of up access code sequence, is complete 1 sequence of 3 SYMBOL length; EMPTY is an empty slot, and (S represents SYMBOL in institute's drawings attached, 1SYMBOL=2bit) not pass any Useful Information.
In Fig. 1 b, G represents to protect time slot equally, and EMPTY represents empty slot, and REG is the reference symbol of DQPSK, and ECS is up signaling information, and comprising the PID number of marking terminal, both have formed the signalling time slot 1.
In Fig. 2, G represents to protect time slot, and EMPTY represents empty slot, and SS represents the time-delay deviation time slot, and PC represents power adjustment time slot, and CS is the signalling time slot 2, comprises traffic channel information.
Fig. 3 has identified the definition of time-delay deviation (conventional letter SS), value be expressed as binary system, wherein the highest order of SS value is represented sign bit.
Fig. 4 is the schematic diagram that branch frame synchronization inserts, and its step is as follows: send out up on the terminal access code sequence MUX1UA, the request access; After the up access code sequence MUX1UA that sends out on the terminal is received in the base station, the time-delay deviation of computing terminal and ascending power; Give out a contract for a project on the terminal synchronizes and contain the up access code sequence MUX1UB in signalling time slot 1; The base station issues the descending access code sequence of the admission confirm that comprises the distribution service channel information to the user of correspondence; Last terminal switches to Traffic Channel according to the descending access code sequence of admission confirm, finishes access.
Fig. 5 has illustrated the flow process that branch frame synchronization inserts, and promptly terminal is given out a contract for a project earlier and contained the MUX1UA of synchronization slot 1, and request inserts; The up access code sequence MUX1UA that sends out is received on the terminal in the base station, according to the burst (pseudo noise code, complete 1 sequence) of synchronization slot 1, and the time-delay deviation of computing terminal and ascending power, and adjudicate with this; By judgement, the base station issues the descending access code sequence of having filled time-delay deviation and ascending power adjusted value, or time-delay deviation is when being invalid value, and it is invalid to announce to insert; After terminal is received descending access code sequence, by judgement, if effective value, giving out a contract for a project on synchronously contains the up access code sequence MUX1UB in signalling time slot 1, the base station provides the MUX1D frame structure that comprises signalling time slot 2 (traffic channel information is wherein arranged) according to the signalling time slot 1; If invalid value, go up again and send out access code sequence MUX1UA up; After the up access code sequence that comprises the signalling time slot 1 is received in the base station, by judging User PID, issue the descending access code sequence of the admission confirm that comprises the distribution service channel information to the user of correspondence; Last terminal switches to Traffic Channel according to the descending access code sequence of admission confirm, finishes access.So just can guarantee the synchronous of signalling time slot 1, reduce, improve systematic function inserting the interference of mobile phone.
Fig. 6 has illustrated the access process of terminal one side, uses mobile phone as terminal herein.In the link setup process, at first utilizing gives out a contract for a project on the terminal contains the MUX1UA of synchronization slot 1, and opening timing device 1.The base station solves the synchronization slot signal after receiving MUX1UA, issues time-delay deviation time slot and power and adjusts time slot.In timer 1 official hour, mobile phone receives that the base station issues comprises the MUX1D that time-delay deviation time slot and power are adjusted time slot, and solving the correct and time-delay deviation time slot SS of CRC check is effective value, and mobile phone is sent out MUX1UB on code channel 17, and opens timer 2; Otherwise mobile phone adds high-power MUX1UA again on code channel 0.The base station issues the MUX1D that comprises the signalling time slot 2 in the timer 2 official hour after receiving MUX1UB.Mobile phone is received signalling time slots 2 explanation link setup success, has finished access.Otherwise, then send out MUX1UA on high-power adding on the code channel 0 again.The time interval between the double MUX1UA frame is the random number that a mobile phone produces.
Fig. 7 has illustrated the channel access process of base station one side.Because the base station is that the 10ms one-period sends and receives, i.e. 5ms reception, 5ms send, and in the 5ms that receives, receive synchronization slot 1, just use known up access code (PN sign indicating number) to carry out correlation computations accurately.Almost require simultaneously to insert owing to may have a plurality of users, can form a plurality of peak values that differ in size at synchronization slot 1.When peak-peak greater than threshold value, when time peak value was less than threshold value simultaneously, we can think to have only a customer requirements to insert, correspondingly calculation delay deviation and power control value, otherwise it is negative peak that the time-delay deviation that issues is adjusted field, and it is invalid that expression inserts.Threshold value is to obtain exact value by simulation calculation and actual measurement.Then the demodulation signalling time slot 1, if the CRC check in the signalling time slot that obtains 1 is incorrect, then signalling time slots 2 field fills 0.Last information according to each field that has obtained is filled descending MUX1D frame, sends in the time at the 5ms that sends.
Fig. 8 a, Fig. 8 b explanation terminal utilizes synchronization slot 2 to receive the effect of adjusting synchronously, the correlation peak such as Fig. 8 a that when utilizing a SYMBOL length to do correlation calculations, obtain, utilizing several (more than one) when SYMBOL length is done correlation calculations, the correlation peak that obtains such as Fig. 8 b, relevant effect be improved significantly.
Above-mentioned up channel and down channel are nonoverlapping in time, are identical on frequency range.Ascending time slot and descending time slot circulate at interval, and the length of each time slot is 5ms herein.
The synchronization slot 1 of above-mentioned terminal in up access code sequence is overlapping with empty slot in the reverse link traffic channel in time, promptly in this ascending time slot, the terminal of having only requirement to insert just goes up sends out synchronization slot 1 signal, and other terminal of communicating by letter is gone this time slot of code channel thereon and do not gone up and send out this signal; The signalling time slot of the up access code sequence of described terminal and the business datum time slot of reverse link traffic channel are overlapping, the synchronous signalling time slot will reduce the interference to other user who is communicating by letter greatly in time.
Above-mentioned base station time delay deviation and power control are to realize by the deviation and the power that calculate the access code sequence.The method of Cai Yonging is as follows in the present embodiment:
A. despreading:
B. calculate
Obtain power
C. obtain power maximum and position thereof
D. by look-up table, obtain the power adjustment of terminal, the difference between maximum value position and the reference value is time delay error.
Described base station is passed through judgement and is filled invalid value, be because at a time having a plurality of users asks to insert, and an access request can only be handled in the base station, at this moment access interference can occur.Have two values to surpass given threshold value when rated output, thinking has two users to insert simultaneously, and the time-delay deviation time slot then issues invalid value, selects herein to represent the time-delay deviation invalid value with negative peak.After terminal was received invalid value, random delay was after a period of time, added high-power going up and sent out up the access code sequence, the request access.So just can avoid the generation of access interference.
Described downlink synchronization slot 2 is used for utilizing the correlation of synchronization slot 2, adjusts the receive time delay deviation of terminal, guarantees the undistorted sampling of terminal; Uplink synchronous time slot 1 is used for adjusting the emission time-delay deviation of terminal, guarantees that terminal arrives the synchronous of base station end, to reduce system interference.
Claims (10)
1. the branch frame synchronization process method of an access channel is applied to it is characterized in that in the SCDMA communication system, comprises the steps:
(1) the up access code sequences Design of wireless channel is become to have the frame structure MUX1UA of protection time slot, synchronization slot 1, empty slot and have the frame structure MUX1UB of empty slot, signalling time slot 1 and protection time slot, descending access code sequences Design becomes to have the frame structure MUX1D that protection time slot, synchronization slot 2, time-delay deviation time slot, power are adjusted time slot, signalling time slot 2 and empty slot;
(2) send out on the terminal access code sequence MUX1UA up, request inserts;
(3) the up access code sequence MUX1UA that sends out is received on the terminal in the base station, according to the deviation and the power of the burst of synchronization slot 1, and the time-delay deviation of computing terminal and ascending power, and adjudicate with this;
(4) by judgement, the base station issues the descending access code sequence of having filled time-delay deviation and ascending power adjusted value, or time-delay deviation is when being invalid value, and it is invalid to announce to insert;
(5) after terminal was received descending access code sequence, by judgement, if effective value, giving out a contract for a project on synchronously contained the up access code sequence MUX1UB in signalling time slot 1; If invalid value, go up again and send out access code sequence MUX1UA up;
(6) after the up access code sequence that comprises the signalling time slot 1 is received in the base station, by judging User PID, issue the descending access code sequence of the admission confirm that comprises the distribution service channel information to the user of correspondence;
(7) terminal switches to Traffic Channel according to the descending access code sequence of admission confirm, finishes access.
2. as claimed in claim 1 minute frame synchronization process method is characterized in that described up channel and down channel are nonoverlapping in time, is identical on frequency range, and ascending time slot and descending time slot circulate at interval.
3. as claimed in claim 1 minute frame synchronization process method is characterized in that, the burst of described synchronization slot 1 can be pseudo noise code, complete 1 sequence.
4. as claimed in claim 1 minute frame synchronization process method, it is characterized in that, the synchronization slot 1 of described terminal in up access code sequence is overlapping with empty slot in the reverse link traffic channel in time, in this ascending time slot, the terminal of having only requirement to insert just goes up sends out synchronization slot 1 signal, and other terminal of communicating by letter is gone this time slot of code channel thereon and do not gone up and send out this signal.
5. as claimed in claim 1 minute frame synchronization process method is characterized in that, the signalling time slot of the up access code sequence of described terminal and the business datum time slot of reverse link traffic channel are overlapping in time.
6. as claimed in claim 1 minute frame synchronization process method is characterized in that, in the described step (4), has two values to surpass given threshold value when rated output, thinks that the time-delay deviation time slot then issues invalid value when having two users to insert simultaneously.
7. as claimed in claim 1 minute frame synchronization process method is characterized in that described downlink synchronization slot 2 is used to utilize its correlation, adjusts the receive time delay deviation of terminal.
8. as claimed in claim 1 minute frame synchronization process method is characterized in that described uplink synchronous time slot 1 is used to adjust the emission time-delay deviation of terminal, guarantees that terminal arrives the synchronous of base station end.
9. as claimed in claim 1 minute frame synchronization process method is characterized in that described access code channel is distinguished by pseudo random sequence.
10. as claimed in claim 1 minute frame synchronization process method, it is characterized in that, described synchronization slot 1 can form a plurality of peak values that differ in size, when peak-peak greater than threshold value, when time peak value is less than threshold value simultaneously, thinks and have only a customer requirements to insert, correspondingly calculation delay deviation and power control value, otherwise it is negative peak that the time-delay deviation that issues is adjusted field, and it is invalid that expression inserts.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021602840A CN1233122C (en) | 2002-12-31 | 2002-12-31 | Framing synchronous processing method of inserting channel |
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| CNB021602840A CN1233122C (en) | 2002-12-31 | 2002-12-31 | Framing synchronous processing method of inserting channel |
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| CN1457157A true CN1457157A (en) | 2003-11-19 |
| CN1233122C CN1233122C (en) | 2005-12-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372247C (en) * | 2004-04-26 | 2008-02-27 | 北京天碁科技有限公司 | Downstream synchronization monitoring apparatus and method for mobile terminal and application thereof |
| CN101132223B (en) * | 2006-08-23 | 2011-11-16 | 北京信威通信技术股份有限公司 | Method for adjusting ascending random access time slot in TDD radio communication system |
| CN103124191A (en) * | 2011-11-21 | 2013-05-29 | 电信科学技术研究院 | Method and device of data transmission in mixed self-organizing network |
| CN104038264A (en) * | 2014-04-22 | 2014-09-10 | 中国水产科学研究院渔业工程研究所 | Short wave communication system power automatic control method |
-
2002
- 2002-12-31 CN CNB021602840A patent/CN1233122C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372247C (en) * | 2004-04-26 | 2008-02-27 | 北京天碁科技有限公司 | Downstream synchronization monitoring apparatus and method for mobile terminal and application thereof |
| CN101132223B (en) * | 2006-08-23 | 2011-11-16 | 北京信威通信技术股份有限公司 | Method for adjusting ascending random access time slot in TDD radio communication system |
| CN103124191A (en) * | 2011-11-21 | 2013-05-29 | 电信科学技术研究院 | Method and device of data transmission in mixed self-organizing network |
| CN103124191B (en) * | 2011-11-21 | 2015-06-10 | 电信科学技术研究院 | Method and device of data transmission in mixed self-organizing network |
| CN104038264A (en) * | 2014-04-22 | 2014-09-10 | 中国水产科学研究院渔业工程研究所 | Short wave communication system power automatic control method |
| CN104038264B (en) * | 2014-04-22 | 2017-09-29 | 中国水产科学研究院渔业工程研究所 | Shortwave Communication System power autocontrol method |
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