CN1324824C - Mapping method for terminal synchronous control command in multiple time slot communication system - Google Patents
Mapping method for terminal synchronous control command in multiple time slot communication system Download PDFInfo
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- CN1324824C CN1324824C CNB2004100915986A CN200410091598A CN1324824C CN 1324824 C CN1324824 C CN 1324824C CN B2004100915986 A CNB2004100915986 A CN B2004100915986A CN 200410091598 A CN200410091598 A CN 200410091598A CN 1324824 C CN1324824 C CN 1324824C
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Abstract
The present invention discloses a mapping method for terminal synchronous control commands in a multiple time slot communication system. The method uses a sub frame as a processing period; the method comprises the following steps that a base station controller calculates ULSC of UE and position numbers of up time slots occupied by up time slots with ULSC in a user terminal; the base station controller reversely calculates the numbers of the SS symbols of one or a plurality of down time slots corresponding to the sequence numbers of the up time slots according to mapping rules of the SS symbols; the base station controller calculates a down time slot where SS symbols corresponding to ULSC are positioned and positions of the SS symbols of the down time slot, and transmits ULSC to the positions of the SS symbols of the down time slot according to the numbers of the SS symbols of UE, which are arranged in the down time slots which UE occupies. The present invention realizes the maintenance of UE specified in a 3GPP protocol and the down mapping of up synchronization control commands in the up synchronization function of a base station to make the SS symbols capable of being immediately transmitted to the user terminal in the last next available down time slot.
Description
Technical field
The present invention relates to the synchronization processing method of user terminal in the 3-G (Generation Three mobile communication system) (UE, User Equipment) and base station (Node B), especially relate to the mapping method of terminal synchronous control command in a kind of multiple time slot communication system.
Background technology
In 3-G (Generation Three mobile communication system), TD-SCDMA (Time Division Duplex-Synchronous Code Division Multiplex Access, tdd CDMA inserts) one of core technology of system is synchronization CDMA, especially between user terminal and the base station synchronously.Use this simultaneous techniques, the asynchronism(-nization) that can overcome the code channel signal arrival base station of launching owing to each portable terminal in the asynchronous CDMA causes the nonopiate interference problem of bringing of code channel, thereby improved the power system capacity and the availability of frequency spectrum, also can simplify hardware circuit, reduced cost.
Be divided into down-going synchronous and uplink synchronous two parts synchronously in the TD-SCDMA system between user terminal and the base station.Radio frames length of TD-SCDMA is 10ms, and it can be divided into two 5ms subframes, and each subframe is divided into 7 conventional time slots and 3 special time slots again.Special time slot is descending pilot frequency time slot (DwPTS), protection (Gp) and uplink pilot time slot (UpPTS) at interval.DwPTS in each subframe designs for descending pilot frequency and down-going synchronous; this time slot is that the descending synchronous code (SYNC_DL) of 64 chips and the protected code of 32 chips are formed at interval by length normally, is launched in omnirange or on a certain sector with maximum power by Node B.After the UE start, must at first set up down-going synchronous by descending pilot frequency time slot (DwPTS) and network, have only the down-going synchronous set up, UE could begin to set up uplink synchronous.Because down-going synchronous is easy to realize that when it has been generally acknowledged that system works, down-going synchronous is stable, need not special consideration.
Uplink synchronous between user terminal and the base station is divided into uplink synchronous foundation and uplink synchronous keeps two steps to realize.Set up the uplink pilot time slot (UpPTS) that uses in the above-mentioned subframe structure synchronously.This time slot is that the uplink synchronous code (SYNC_UL) of 128 chips and the protection of 32 chips are formed at interval by length usually; when UE is in aerial registration and at random during access state; it will at first launch UpPTS, after obtaining the replying of network, send request at RACH (Random Access Channel).The UpPTS of network side to receiving, in the search window of regulation, (SYNC_UL) carries out the detection of matched filtering mode with the uplink synchronous code that may use, estimate time delay, send response at FPACH (forward physical access channel) and inform UE, make it when sending signal, carry out the corresponding time next time and adjust the uplink synchronous of foundation and base station.
Uplink synchronous keeps utilizing in the subframe structure the middle pilot field of each uplink conventional time slot to realize.7 above-mentioned conventional time slots are divided into the time slot of uplink and downlink different directions; each time slot 864 chip is formed by training sequence (middle pilot tone) territory of the data field of two 352 chips, 144 chips and the spatial domain (GP) as the time slot protection of one 16 chip.
3GPP (3
RdGeneration Partnership Project the 3rd generation mobile communication partnership project) agreement 25.224 v480 have carried out following description to synchronous maintenance: uplink synchronous is safeguarded by the up link that sends relative down link time of reception pre-set time.The maintenance of uplink synchronous can utilize the middle pilot regions of each ascending time slot 864 chip.Each ascending time slot can carry a plurality of UE.The middle pilot tone difference of each UE in each ascending time slot.Node B can be by calculating the channel impulse response estimation time of each UE in the same time slot, afterwards, in the available descending time slot of the next one, Node B sends simultaneous bias, and (Synchronisation Shift, SS) order makes UE can suitably adjust its launch time.
And 3GPP agreement 25.221 v470 have carried out following description to the transmission of SS: to each user, (Up link Sync Command, ULSC) information should be sent out once in each subframe the uplink synchronous control command at least.To each distributed time slot, independently indicated this time slot whether to carry ULSC by signaling.If a time slot carries ULSC, the SS symbol sends at the data division of business burst so, and they use the physical channel emission of physical channel sequence number (p) minimum in this time slot.The SS symbol also can send on a plurality of physical channels of a time slot.For this purpose, upper-layer protocol is respectively the other N of each time slot allocation
SSIndividual physical channel.The SS symbol uses the N of physical channel sequence number minimum in this time slot
SS+ 1 physical channel emission.If last physical channel N in this time slot among the result that rate-matched provides
RM＜N
SS+ 1, then the SS symbol is only used last N
RMThe physical channel emission.SS is used to the order of every M subframe and regularly adjusts (k/8) Tc, and Tc is a chip-spaced.K and M are notified by network signal.The every 5ms subframe emission of SS once.
M (span 1～8) and k (span 1～8) can also can readjust in calling procedure setting up the calling procedure adjustment.The all corresponding ascending time slot of descending each SS symbol depends on the ascending time slot of distribution and the SS symbol of descending distribution.For each ascending time slot, synchronously switching command all will be by following rule, i.e. SS mapping (following equation is used for determining the ascending time slot by corresponding SS Signed Domination):
UL
pos＝(SFN′·N
SSsymbols+SS
pos+((SFN′·N
SSsymbols+SS
pos)div(N
ULslot)))mod(N
ULslot)
Herein, UL
PosIt is controlled ascending time slot sequence number; SFN ' is the system frame number of record subframe, and the system frame number of radio frames (SFN) can obtain from SFN ', passes through SFN=SFN '/2, here is the operation of dividing exactly; N
SSsymbolsIt is SS symbolic number in the frame; SS
PosIt is the symbol number of corresponding SS in a subframe; N
ULslotIt is the ascending time slot number in a subframe.
Stipulated in the above-mentioned agreement that uplink synchronous estimates the method for ULSC by channel impulse response, and which descending SS symbol the ULSC that has stipulated each ascending time slot should be mapped to, promptly provided the mapping formula, the every M subframe of this SS symbol just need be revised once, and there are a plurality of uplink and downlink time slots in UE of TD-SCDMA system support, but how regulation sends up ULSC in descending SS symbol.Therefore, how ULSC is write descending time slot according to the mapping formula of agreement, particularly just send the SS symbol at once and go out, rather than need delay several subframes at the available descending time slot of the next one; How between each uplink and downlink time slot, to transmit minimum information to reduce system's computing and communications burden; How to guarantee every M time rather than revise the SS symbol at every turn, become the difficult problem of current prior art.
Summary of the invention
Technical problem to be solved by this invention provides the mapping method of terminal synchronous control command in a kind of multiple time slot communication system, this method realized that the user terminal stipulated in the 3GPP agreement keeps and base station uplink synchronous function in the uplink synchronous control command to descending mapping, the simultaneous bias symbol can be sent at nearest next available descending time slot immediately to user terminal, thereby set up the uplink synchronous between user terminal and the base station rapidly, and the data interaction of uplink and downlink time slot is very little with the burden of communicating by letter to the inside of base station computing.
In order to solve the problems of the technologies described above, the invention provides the mapping method of terminal synchronous control command in a kind of multiple time slot communication system, this method is the processing cycle with a subframe, comprises the steps:
(a) base station controller judges whether user terminal needs to revise simultaneous bias order in the current subframe, if need to revise simultaneous bias order, execution in step (b) then, otherwise this subframe is not carried out the simultaneous bias sign map, inserts corresponding synchronous deviant in the subframe in the simultaneous bias symbol;
(b) the base station controller Position Number of ascending time slot in the shared ascending time slot of described user terminal that calculate the uplink synchronous control command of described user terminal and carry this uplink synchronous control command, i.e. ascending time slot sequence number;
(c) according to the rule of simultaneous bias sign map, the reverse simultaneous bias symbol number that calculates in the pairing one or more descending time slots of the ascending time slot sequence number of carrying described uplink synchronous control command of base station controller, the computing formula of described simultaneous bias sign map rule is
UL
pos＝(SFN′·N
SSsymbols+SS
pos+((SFN′·N
SSsymbols+SS
pos)div(N
ULslot)))mod(N
ULslot)
Wherein, UL
PosBe the ascending time slot sequence number; SFN ' is the system frame number of record subframe; NSS
SymbolsIt is simultaneous bias symbolic number total in the frame; SS
PosIt is the symbol number of respective synchronization skew in a subframe; N
ULslotBe the ascending time slot number of described user terminal in a subframe;
(d) base station controller calculates the descending time slot at the pairing simultaneous bias symbol of described uplink synchronous control command place and the simultaneous bias character position in this descending time slot according to the simultaneous bias symbol numbers that the described user terminal that obtains disposes in its each shared descending time slot;
(e) base station controller is sent to described uplink synchronous control command the simultaneous bias character position of the descending time slot that step (d) draws.
Further, said method can have following characteristics: judge that the method whether user terminal needs to revise simultaneous bias order is in the described step (a), whether the number of sub frames that judgement is write down after user's terminal is set up is the multiple of M, M is notified by network signal, its span 1～8 can be adjusted or readjust in calling procedure setting up in the calling procedure.
Further, said method can have following characteristics: base station controller calculates the uplink synchronous control command of described user terminal by channel impulse response in the described step (b), and the ascending time slot sequence number can be obtained by the configuration of network side.
Further, said method can have following characteristics: the value of SFN ' is the count value of a counter safeguarding voluntarily of base station network side in the described step (c), and this counter adds 1 every 5ms, and span is 0～8191.
Further, said method can have following characteristics: NSS in the described step (c)
SymbolsThe simultaneous bias symbolic number of each descending time slot of taking by the described user terminal that adds up of value obtain, the simultaneous bias symbolic number of descending time slot is obtained from the user terminal information of network side configuration.
Further, said method can have following characteristics: N in the described step (c)
UlslotValue dispose when the distributing user terminal related resource by network side.
Further, said method can have following characteristics: described user terminal can be one or several, when the number of user terminal greater than 1 the time, base station controller is taked parallel processing to several user terminals.
Compared with prior art, the mapping method of terminal synchronous control command has the following advantages in the multiple time slot communication system of the present invention:
A, this method are the simultaneous bias sign map rules of reverse application 3GPP agreement defined, on the basis of known ascending time slot sequence number, obtain its corresponding synchronous skew character position, realized that the user terminal of stipulating in the agreement keeps and base station uplink synchronous function in the uplink synchronous control command to descending mapping;
The ascending time slot that is mapped in of simultaneous bias symbol is just finished in B, this method, and need not to wait for the uplink synchronous control command of other ascending time slots, and every M subframe just this uplink synchronous control command is write appointment descending time slot the simultaneous bias character position once, make the simultaneous bias symbol to send to immediately at nearest next available descending time slot to user terminal, thereby set up the uplink synchronous between user terminal and the base station rapidly, and the data interaction of uplink and downlink time slot is very little with the burden of communicating by letter to the inside of base station computing.
Description of drawings
Fig. 1 is the schematic flow diagram of the mapping method of terminal synchronous control command in the multiple time slot communication system of the present invention;
Fig. 2 is the mapping relations exemplary plot that the respective synchronization of a descending time slot of application this method is offset the Signed Domination ascending time slot;
Fig. 3 is the schematic diagram that descending time slot simultaneous bias character position is shone upon and be sent to the uplink synchronous control command of a kind of up generation of application this method;
Fig. 4 is the required key event figure of the simultaneous bias symbol from the uplink synchronous control command to descending time slot among the present invention.
Embodiment
For understanding the mapping method of terminal synchronous control command in the multiple time slot communication system of the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, the mapping method of terminal synchronous control command in the multiple time slot communication system of the present invention, with a subframe as the processing cycle, describe with single UE (user terminal) in the example, if need to handle a plurality of UE, base station controller can comprise the steps: a plurality of UE parallel processings
Step 1, base station controller judges whether UE needs to revise SS (simultaneous bias) order in the current subframe, judge promptly whether the number of sub frames that is write down is the multiple of M after UE sets up, M can be notified by network signal, and its span 1～8 can be adjusted or readjust in calling procedure setting up in the calling procedure, if need to revise the SS order, then execution in step two, otherwise this subframe is not carried out the SS sign map, insert corresponding SS value in the subframe in the SS symbol;
The Position Number of ascending time slot in the shared ascending time slot of described UE that step 2, base station controller calculate the ULSC (uplink synchronous control command) of described UE and carry this ULSC, i.e. ascending time slot sequence number UL
PosIn fact, in the process of base station uplink synchronous, base station controller is estimated the ULSC value by channel impulse response in maintenance customer's terminal, the ascending time slot that this UE takies is by network side configuration, the therefore current numbering UL of ascending time slot in the ascending time slot that this UE takies
PosCan obtain;
Step 3, according to the rule of SS sign map, the reverse UL that obtains in the step 2 that calculates of base station controller
PosSS symbol number SS in pairing one or more descending time slot
Pos, the computing formula of described SS sign map rule is
UL
pos＝(SFN′·N
SSsymbols+SS
pos+((SFN′·N
SSsymbols+SS
pos)div(N
ULslot)))mod(N
Lslot)
Wherein, SFN ' is the system frame number of record subframe, the count value of the counter that its value is safeguarded voluntarily for the base station network side, and this counter adds 1 every 5ms, and span is 0～8191; NSS
SymbolsBe SS symbolic number total in the frame, its value obtains by the SS symbolic number of each descending time slot that the described UE that adds up takies, and the SS symbolic number of descending time slot is obtained from the UE information of network side configuration; N
ULslotBe the ascending time slot number of described UE in a subframe, its value is disposed when distributing the UE related resource by network side;
Fig. 2 provides the mapping relations exemplary plot of the corresponding SS Signed Domination ascending time slot of a descending time slot, and 3 ascending time slots that UE takies among the figure have been described SS symbol configuration number under two kinds of situations, and the left side is 2 SS symbols of configuration of situation 1; The right is configuration 4 SS symbols, i.e. N of situation 2
ULslot=3, N
SSsymbols=2 or N
SSsymbols=4, in addition among the figure 1
StUL
PosBe meant first UL that calculates in the mapping formula
Pos, other UL accordingly
PosShown in arrow among the figure;
Step 4 is obtained the SS symbol numbers that described UE disposes respectively in the UE information of base station controller by the network side configuration in its each shared descending time slot;
Step 5, base station controller calculate the descending time slot at the pairing SS symbol of described ULSC place and the SS character position in this descending time slot according to the result who obtains in the step 4;
Step 6, base station controller write described ULSC or be sent to the SS character position of the descending time slot that step 5 draws.
Fig. 3 has provided the ULSC command mapping of a kind of up generation of using this method and has been sent to the mapping situation of descending time slot SS character position, and suppose: the ascending time slot that UE takies is counted N
ULslot=3, be respectively time slot 1, time slot 2, time slot 3; UE takies two descending time slots, is respectively time slot 4, time slot 5; And time slot has disposed the SS symbol of this UE for 4 times, and time slot has disposed 3 SS symbols of this UE for 5 times.
In this case, what the SS symbol can be total is numbered 0,1,2,3, and wherein the SS symbol number of time slot 4 is 0, and the SS symbol number of time slot 5 is 1～3.Among Fig. 3, the ULSC that ascending time slot 1 produces puts into the SS symbol of descending time slot 4, has promptly taken master serial number and be 0 SS symbol; The ULSC that ascending time slot 2 produces puts into two SS symbols according to the mapping relations needs, and corresponding respectively master serial number is 1 and 3 SS symbol, that is to say to correspond to be numbered 0 and 2 SS character position in the time slot 5; The ULSC that ascending time slot 3 produces puts into the 2nd SS character position of master serial number according to the mapping formula, promptly is numbered 1 SS position in the time slot 5.
The process of putting into after the required SS positional information of putting into of this ULSC of obtaining is optimum, has used minimum information to realize the concrete function of mapping.This method both avoided ascending time slot finish mapping and the time need the communication process of the ULSC that all ascending time slots produce (this can cause mapping in the end an ascending time slot do, easily cause the time-delay of waiting for other gap informations and make and to take place in the situation that the descending time slot that closes on sends at once), (this can require just to finish mapping at first descending time slot also to have avoided finishing mapping at descending time slot, require all ULSC all to be dealt into this time slot, and the SS that this time slot produces needs to issue other descending time slots, and also easily causing the time-delay of waiting for other gap informations to make in the process can not take place in the situation that the descending time slot that closes on sends at once).
Order the required key event of the SS symbol of descending time slot as shown in Figure 4 from ULSC among the present invention, to the SS symbol,, can obtain corresponding D LTS number after the SS numbering and the numbering of the SS in this DLTS, and directly send and put in place knowing ascending time slot number from ULSC.
The invention discloses the method for the synchronous control command mapping of terminal and base station uplink synchronous in a kind of multiple time slot communication system.This method is simply efficient, at first obtain current ascending time slot numbering with and the UE information relevant with mapping, promptly finish the SS mapping in advance at this ascending time slot, obtain the position of the required transmission of ULSC, and then a direct step is sent completely, reduced amount of calculation and memory space, avoided the influence of communication delay, guaranteed the quick foundation in the synchronous maintenance synchronous control command validity.
Above embodiment only is used to illustrate the present invention, but not be used to limit the present invention, though current execution mode can use in the TD-SCDMA system, this method is not limited to the TD-SCDMA system, so long as have the communication system of a plurality of uplink and downlink timeslots all may use, and obtain beneficial effect.
Claims (8)
- The mapping method of terminal synchronous control command is characterized in that in l, a kind of multiple time slot communication system, and this method is the processing cycle with a subframe, comprises the steps:(a) base station controller judges whether user terminal needs to revise simultaneous bias order in the current subframe, if need to revise simultaneous bias order, execution in step (b) then, otherwise this subframe is not carried out the simultaneous bias sign map, inserts corresponding synchronous deviant in the subframe in the simultaneous bias symbol;(b) the base station controller Position Number of ascending time slot in the shared ascending time slot of described user terminal that calculate the uplink synchronous control command of described user terminal and carry this uplink synchronous control command, i.e. ascending time slot sequence number;(c) according to the rule of simultaneous bias sign map, the reverse simultaneous bias symbol number that calculates in the pairing one or more descending time slots of the ascending time slot sequence number of carrying described uplink synchronous control command of base station controller, the computing formula of described simultaneous bias sign map rule isUL pos＝(SFN′·N SSsymbols+SS pos+((SFN′·N SSsymbols+SS pos)div(N ULslot)))mod(N ULslot)Wherein, UL PosBe the ascending time slot sequence number; SFN ' is the system frame number of record subframe; Nss SymbolsIt is simultaneous bias symbolic number total in the frame; SS PosIt is the symbol number of respective synchronization skew in a subframe; N ULslotBe the ascending time slot number of described user terminal in a subframe;(d) base station controller calculates the descending time slot at the pairing simultaneous bias symbol of described uplink synchronous control command place and the simultaneous bias character position in this descending time slot according to the simultaneous bias symbol numbers that the described user terminal that obtains disposes in its each shared descending time slot;(e) base station controller is sent to described uplink synchronous control command the simultaneous bias character position of the descending time slot that step (d) draws.
- 2, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 1, it is characterized in that: judge that the method whether user terminal needs to revise simultaneous bias order is in the described step (a), whether the number of sub frames that judgement is write down after user's terminal is set up is the multiple of M, M is notified by network signal, and the span of M is 1～8.
- 3, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 2 is characterized in that: described M can adjust or readjust in calling procedure setting up in the calling procedure.
- 4, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 1, it is characterized in that: base station controller calculates the uplink synchronous control command of described user terminal by channel impulse response in the described step (b), and the ascending time slot sequence number can be obtained by the configuration of network side.
- 5, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 4, it is characterized in that: the value of SFN ' is the count value of a counter safeguarding voluntarily of base station network side in the described step (c), this counter adds 1 every 5ms, and span is 0～8191.
- 6, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 5 is characterized in that: Nss in the described step (c) SymbolsThe simultaneous bias symbolic number of each descending time slot of taking by the described user terminal that adds up of value obtain, the simultaneous bias symbolic number of descending time slot is obtained from the user terminal information of network side configuration.
- 7, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 6 is characterized in that: N in the described step (c) UlslotValue dispose when the distributing user terminal related resource by network side.
- 8, the mapping method of terminal synchronous control command in the multiple time slot communication system according to claim 1, it is characterized in that: described user terminal can be one or several, when the number of user terminal greater than 1 the time, base station controller is taked parallel processing to several user terminals.
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| CN101060364B (en) * | 2006-04-20 | 2011-02-09 | 上海宣普实业有限公司 | Uplink data transmission equipment in TD-SCDMA system |
| EP1919148A1 (en) * | 2006-10-30 | 2008-05-07 | Mitsubishi Electric Information Technology Centre Europe B.V. | Method for transmission in a TDD system with a variable length guard period |
| CN101394668B (en) * | 2008-10-24 | 2012-04-18 | 中兴通讯股份有限公司 | Method and device for sending scheduling request signal |
| CA3047928A1 (en) * | 2012-07-27 | 2014-01-30 | Kenneth Kerpez | Management system and methods of managing time-division duplex (tdd) transmission over copper |
| SG11202009721WA (en) | 2018-04-02 | 2020-10-29 | Beijing Xiaomi Mobile Software Co Ltd | Method and apparatus for transmitting synchronized broadcast information |
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| CN1182990A (en) * | 1997-10-05 | 1998-05-27 | 北京信威通信技术有限公司 | Method for establishing and holding synchronous code division multiple access communication chain |
| CN1236235A (en) * | 1998-05-08 | 1999-11-24 | 松下电器产业株式会社 | Base station apparatus and control method for transmitting power |
| CN1452821A (en) * | 2001-07-13 | 2003-10-29 | 连宇通信有限公司 | Method and system for quickly synchronizing uplink and base station access channel receiver |
| CN1461156A (en) * | 2002-05-23 | 2003-12-10 | 株式会社Ntt都科摩 | Radio communication system, wireless terminal base station, control equipment and communication method |
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2004
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182990A (en) * | 1997-10-05 | 1998-05-27 | 北京信威通信技术有限公司 | Method for establishing and holding synchronous code division multiple access communication chain |
| CN1236235A (en) * | 1998-05-08 | 1999-11-24 | 松下电器产业株式会社 | Base station apparatus and control method for transmitting power |
| CN1452821A (en) * | 2001-07-13 | 2003-10-29 | 连宇通信有限公司 | Method and system for quickly synchronizing uplink and base station access channel receiver |
| CN1461156A (en) * | 2002-05-23 | 2003-12-10 | 株式会社Ntt都科摩 | Radio communication system, wireless terminal base station, control equipment and communication method |
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