CN101548487A - Method for the time-based control of an upward signal transmission in a radio communication system - Google Patents
Method for the time-based control of an upward signal transmission in a radio communication system Download PDFInfo
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- CN101548487A CN101548487A CNA2007800449521A CN200780044952A CN101548487A CN 101548487 A CN101548487 A CN 101548487A CN A2007800449521 A CNA2007800449521 A CN A2007800449521A CN 200780044952 A CN200780044952 A CN 200780044952A CN 101548487 A CN101548487 A CN 101548487A
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Abstract
The invention relates to a method for controlling a time-based transmission of signals of a subscriber terminal (UE A) for synchronous reception at a base station (Node B) of a radio communication system. Upon detection that a determined time offset of received signals is equal to or greater than a predetermined threshold value, a change from one-step control commands to multi-step control commands for controlling the time-based transmission of the subscriber terminal (UE A) is performed by the base station (Node B), or a synchronization procedure is initiated by means of a randomly chosen access channel by the subscriber terminal (UE A).
Description
Technical field
The present invention relates to a kind of being used for controlling in time by subscriber terminal equipment in up link the transmission of signal so that the method that these signals can synchronously be received at the base station location place of radio communications system.In addition, the present invention relates to be used to carry out the assembly of the radio communications system of the method according to this invention.
Background technology
Current be in standardization in radio communications system have to subscriber terminal equipment the transmission in up link and carry out synchronous different necessity, thereby these transmissions can be synchronously or are received by the base station in tolerable time width at least and processed, and described radio communications system adopts different schemes for this reason.
Therefore, for example, not only when subscriber terminal equipment inserts for the first time but also when having connection, use so-called multistep time adjustment control (English: Multi-Step Timing Alignment Control (TAC)) according to known GSM standard (Global System for MobileCommunication (global system for mobile communications)).The first access of STOCHASTIC CONTROL (English: in the time of random access (inserting at random)), this subscriber terminal equipment at first for control insert radio blocks transmission in time according to open adjustable ring (English: openloop (open loop)) principle towards the base station signal that in up link, is transmitted.Described access radio blocks has bigger guard time (English: guard period (protection period)), receive the probability that inserts radio blocks so that improve within time window or time slot by the base station.After the base station receives the access radio blocks, this base station is according to receiving moment of inserting radio blocks to the subscriber terminal equipment signaling: whether need transmission to the subscriber terminal equipment (English: (English: advance), also promptly adjust so-called Timing Advance (TimingAdvance) retract) or in advance that lags behind.At this, utilize the multistep signalingization, this subscriber terminal equipment is informed in this base station, should carry out this hysteresis or in advance with the time quantum of how much quantity.When having connection, for example connect that (English: under situation circuit switched), (English: closed loop) principle is towards the VoP that is transmitted by this subscriber terminal equipment or with the signal of so-called SACCH (SlowAssociated Control Channel (slow associated control channel)) according to the closed type adjustable ring in this base station in this connection in so-called circuit switching.And during voice data transmission is interrupted, promptly for example during the so-called DTX cycle (DTX-Discontinuous Transmission (discontinuous transmission)), to the chain of command of Timing Advance to the so-called SID frame that periodically sends by this subscriber terminal equipment (SID-SilenceDescription (explanation of mourning in silence)) or towards the signal of SACCH, thereby under any circumstance the time coupling is carried out in described transmission every four multiframes or 480ms.
According to GPRS standard (General Packet Radio System (general packet radio)) towards the connection of grouping the time, similarly time coupling is carried out in described transmission every 480ms, wherein this base station is towards the packet that is received.Do not send packet through the long time interval or do not distribute under the situation of the radio resource in up link at this subscriber terminal equipment to this subscriber terminal equipment, chain of command to by this subscriber terminal equipment every eight multiframes or access radio blocks that 960ms sent.
The fdd mode (FDD-Frequency Division Duplex (Frequency Division Duplexing (FDD))) that is also referred to as the UMTS standard (UMTS-Universal MobileTelecommunication System (Universal Mobile Telecommunications System)) of W-CDMA (Wideband-Code Division Multiple Access (Wideband Code Division Multiple Access (WCDMA))) is compared with foregoing GSM standard or GPRS standard, is in the first scope that inserts or does not all have time control to the transmission in up link under the situation in already present connection.Transmission in up link is only towards the moment that signal in down link is received, thereby synchronously do not received in time by this base station with the signal of base station, base station at a distance of the subscriber terminal equipment of different distance.
For in 3GPP (3rd Generation Partnership Project (third generation partner program)) scope standardized UMTS standard improve that (universal terrestrial radio that is called as evolution inserts for (E-UTRA) or the LTE (Long Term Evolution (Long Term Evolution)); 9.1.2.6 chapter according to current technical report 3GPP TR 25.814 v7.0.0 (2006-06) " Physical layer aspects for evolved Universal TerrestrialRadio Access (UTRA) (Release 7) " stipulates that at present (English: timingcontrol commands) time for control subscriber terminal equipment (UE-User Equipment (subscriber equipment)) sends the so-called time control command of one side from the base station (eNB-E-UTRAN NodeB) signalling. At this； consider two kinds of interchangeable forms of implementation of described order.At first be so-called two elementary time control commands ( English: binary timing-controlcommand ) ； this two elementary times control command utilizes two binary conditions of signaling bit to control with a certain that what also will define is the hysteresis of the described transmission carried out of the step pitch of unit or in advance with microsecond ( us ) ； and utilizes the periodicity that equally also will define by signalingization.Be more or less corresponding to the order of the multistep time adjustment control command of GSM standard in addition, however should order only as required by signalingization.
By only using unique signaling bit, the use of two elementary time control commands provides the only advantage of the signaling load of pettiness undoubtedly, wherein as a supplement, must be given in advance to step pitch and periodic definition on higher protocol layer where necessary from network one side, and must give this subscriber terminal equipment with signaling, this can according to circumstances or also can periodically carry out again.Yet disadvantageously, utilize order only can realize the change of determining that the time is sent, the fast-changing multipath transmission (English: may cause this adjusting can not enough follow these variations apace in the time of multi-path transmission) that this especially occurs on radio interface.In addition, the what is called dead example of birth (Birth-Dead-Beispiel) with reference to the accessories B .4 of technical specification TS 25.104 V7.4.0 (2006-06) " BaseStation (BS) radio transmission and reception (FDD) (Release 7) ", in view of the above, the path can experience the relative change up to 9us within the time interval of 191ms.
By using multistep time control command, can react relatively effectively and neatly with respect to two elementary time control commands, yet this causes the signaling load to improve significantly for binary information unfriendly path change fast.
Summary of the invention
Therefore, task of the present invention is, illustrates a kind ofly can flexibly and control the method for the signal transmission in the up link and the assembly of radio communications system simultaneously effectively in time.This task is solved by the feature of independent claims. and favourable improvement project of the present invention can draw from dependent claims.
According to the present invention, for the signal transmission in time of controlling subscriber terminal equipment receives to be used for locating time synchronized ground in the base station of radio communications system, when the determined time deviation of the signal of having determined to be received is equal to or greater than threshold value given in advance, to be used to control the transmission in time of this subscriber terminal equipment, perhaps under the situation of the access channel that uses STOCHASTIC CONTROL, synchronization program is carried out initialization by this base station execution conversion by this subscriber terminal equipment from the one-step control order to the multistep control command.
Advantageously make when needed thus, also promptly when bigger time deviation occurring, can be transformed into the multistep control command from beginning described two elementary time control commands neatly, so that realize the Fast Reconstruction of synchronism thus.For example under the situation of the access channel that uses STOCHASTIC CONTROL, the alternative advantage that execution had to synchronization program according to the present invention is, replace time-consuming synchronism to rebuild, the time control command of utilization uses known mechanism to be used to realize synchronism, and has therefore reduced the total signaling load on the radio interface.
First expansion scheme according to the present invention is used as the one-step control order with binary or ternary signaling bit.In addition, be alternative in known binary signaling bit and the use of ternary signaling bit is used as independent invention in independent claims, is protected.Use to the ternary signaling bit advantageously makes it possible to the signaling third state or order, for example should not carry out temporal change to the transmission of subscriber terminal equipment, and therefore stops the originally unnecessary time coupling that causes the subscriber terminal equipment energy consumption to improve.
Another expansion scheme according to the present invention, by base station and/or subscriber terminal equipment determine based on the time deviation of the comparison of threshold value, wherein according to another expansion scheme, described time deviation compares to determine by the time of reception and the time reference of the signal that will be received.Thus, can be from the base station or subscriber terminal equipment determine and determine send control and whether should change or should carry out synchronization program the form of time control command.
Another expansion scheme according to the present invention in decision whether should carry out the conversion of control command or should not carry out initialization to synchronization program the time, takes in to the current state of user terminal and/or to the type of service of the existing connection of subscriber terminal equipment.If for example be have high quality-of-service (English: business Quality of Service (QoS)), when carrying out synchronization program, may no longer satisfy requirement given in advance so.In this case, only just can compensate determined time deviation, and therefore can observe described requirement by being transformed into multistep time control command.Under the situation that only has the low business that requires aspect the time delay is different situation.In this case, can advantageously move synchronization program, and can satisfy given requirement.Be equally applicable to for example state of subscriber terminal equipment, that is to say for example to keep on one's own initiative connecting or be passive or dormancy.
The assembly with base station and subscriber terminal equipment form according to radio communications system of the present invention and this system has device respectively in order to carry out the method according to this invention.
Description of drawings
Next the invention will be further described by embodiment.This:
Fig. 1 illustrates the exemplary configurations of radio communications system,
Fig. 2 illustrates and is used for the timetable of exemplary illustration at the time drift of the transmission of up link,
Fig. 3 illustrates the timetable that is used for the time deviation of exemplary illustration between the signal of different user terminals equipment,
Fig. 4 illustrates the flow chart according to first method of the present invention,
Fig. 5 illustrates the flow chart according to second method of the present invention.
Embodiment
The structure of radio communications system exemplarily is shown, especially according to the structure of the radio communications system of E-UTRA standardization or the standardized current standard of UMTS-LTE in Fig. 1.So-called IAD aGW (Access Gateway) is connected with other assembly of this system or with other system by the network based on IP (IP-InternetProtocol (Internet Protocol)).The data communication service of IAD aGW and this network exchange data packet form.In addition, IAD aGW is connected with a plurality of base station node B, and described base station node B is supplied to exemplary radio plot ZA or ZB respectively with radio technical resources.The described exemplary base station node B that illustrates is connected with subscriber terminal equipment UE A, UE B by radio interface again.On this radio interface, signal is transmitted in up link UL (Uplink) and down link DL (Downlink).The related in the method according to the invention assembly of radio communications system has at least one control device ST that is used to send with the transmission/receiving system SEE of received signal and is used to control the behavior of this assembly and transmission/receiving system SEE respectively.
Fig. 2 illustrates the timetable that is used for signal relevant with variation transmission delay the time drift that exemplary illustration sent at up link UL by subscriber terminal equipment UE.At this, Fig. 2 uses from the technical literature Tdoc R1-062372 with title " Considerations on E-UTRA Uplink TimeSychronization ", described technical literature is to be suggested in the framework of the 3GPP TGS-RAN WG1 #46 meeting that hold in Estonian Tallin on August 28th, 2006 to September 1, consults the document to obtain further elaboration.In the timetable below, received desirable (Ideal UL Timing atthe Node B (the desirable UL at the Node B place regularly)) has exemplarily defined in maximum time deviation (Max.Timing margin (maximum timing nargin)) that receiver side is supported constantly at base station node B from the signal that sent in subframe (sub-frame) in up link UL.Above two timetables illustrated since short transmission delay (shorter propagationdelay (short propagation delay)) and this ideal compare constantly do sth. in advance in time to reception with the signal of the subframe of so-called CP field (CP-cyclic prefix (Cyclic Prefix)) beginning, with because the reception that long transmission delay (longer propagation delay (long propagation delay)) lags in time to the signal of subframe, described reception should be controlled by the time of the present invention respectively and compensate.
Fig. 3 shows the corresponding timetable of subscriber terminal equipment UE A, the UE B (UE channeling) that use different frequency respectively, and described subscriber equipment is as exemplarily illustrating among Fig. 1.Because apart from the physical distance difference of base station node B, therefore the signal of corresponding subframe arrives constantly in difference and receives base station node B place.For in the signal, for example data block LB# 2 demodulation simultaneously that guarantee under such exemplary cases within time window (demodulation window (demodulation window)) two subscriber terminal equipment UE A, UE B, should not surpass maximum time deviation (max.timing misalignment (maximum regularly misalignment)).
According to the standardized current standard of E-UTRA (referring to Tdoc R1-062372), maximum time, deviation should be less than Cyclic Prefix (English: length cyclic prefix), preferably less than half length of this Cyclic Prefix, the length of wherein said Cyclic Prefix adopts～3.65 to 4.13us.Value in this can consider 0.5 to 1us scope, wherein according to the example of Fig. 3, maximum time deviation should be selected must be less than Cyclic Prefix half long, promptly less than～2us.Yet, be 500km/h and be vertical (English: in the time of perpendicular), after 0.5 or 1 second, reached this maximum to the moving direction of base station in the maximal rate that is adopted of subscriber terminal equipment.Yet, 0.5 to 2us the maximum time deviation of being approximately that is determined size like this is not suitable for utilizing the quick variation up to 9us of two elementary time control commands according to the dead example of the described birth of the beginning of technical specification TS 25.104 compensation transmission path within 191ms, and the maximum step pitch of wherein said two elementary time control commands and signaling are periodically towards described maximum time deviation.
Now, first embodiment and second embodiment according to the inventive method have been shown in Fig. 4 and Fig. 5, wherein in illustrated flow chart, illustrated in exemplary base Node B and each action among the subscriber terminal equipment UE A at Fig. 1 and the transmission of the signal on the radio interface between described base station node B and the subscriber terminal equipment UE A according to time t.Except illustrated action, also have other action and signaling transmission certainly, yet described other action and signaling transmission are unimportant for explanation the method according to this invention.
Suppose as initial situation, subscriber terminal equipment UE A is in the so-called RRC connection mode (RRC Connected Mode), that is to say in the state that is in the exchange of the active signaling of base station node B, keep in addition with the time reference of base station node B in time synchronously.This means, in up link, give base station node B on one's own initiative transmission signals (for example at communication traffic channel (English: the packet of the business traffic channel) or during signaling channel (English: particular message control channel) or sequence), this base station node B is determined the time deviation of received signal and the time reference of self.Under the situation that the multichannel on the radio interface is propagated, base station node B for example determines time deviation towards the strongest path of received signal.According to determined time deviation, be or with which kind of degree whether received signal arrive with lagging ahead of time or, base station node B in down link DL to subscriber terminal equipment UE A signaling: the transmission in up link UL of data subsequently or signal should do sth. in advance or carry out with lagging with definite time measure.If for example subscriber terminal equipment UE A keeps Packet data service and only will be used for keeping the data of synchronism and/or signaling to send to base station node B in up link with the bigger time interval (for example every four multiframes), yet base station node B carry out signalingization to each coupling of subscriber terminal equipment UE A transmission in time in each multiframe, and this can carry out with a plurality of signaling steps aspect base station node B where necessary.
Suppose in addition, based on realizing that as known two elementary time control commands from current existing standard or three elementary time control commands according to the present invention the signaling of base station node B is used for controlling in time the transmission of subscriber terminal equipment UE A.This means that for example utilize the signaling subscriber terminal equipment UE A of the signaling bit with value+1: with transmission lag 1us, signaling is used in same duration-1: will send 1us in advance.Under the situation of three elementary time control commands, for example be worth 0 and use signaling, should not carry out temporal change subscriber terminal equipment UE A one side to transmission.As previously described, can determine the step pitch and the periodic size of transmitting time control command according to the maximum time deviation.Yet under any circumstance all need subscriber terminal equipment UE A to know described periodicity and step pitch, so as can to receive described order and can as the base station is desired, transform as described in order.For this reason, for example realize signalingization in the well-known protocol on more high-rise from base station node B one root certificate.
In Fig. 4, based on foregoing initial situation realize subscriber terminal equipment UE A on the wave point in up link UL to the signal transmission of base station node B, according to the example of Fig. 1, this subscriber terminal equipment UE A is current to be among its radio plot ZA.This signal transmission (for example packet of data service or synchronizing sequence) is received by base station node B, and in order to determine time deviation, for example the time reference with detected strongest signal paths and inside of base station compares.Subsequently, base station node B will compare at determined time deviation of subscriber terminal equipment UE A and threshold value given in advance.If this relatively draws determined time deviation less than this threshold value (result is a "No"), base station node B further carries out the signalingization of binary or three elementary time control commands so, and the user equipment (UE) A that wherein receives this order takes in so that the time control that sends is subsequently mated this time control command.If in contrast, this relatively draws determined time deviation and is equal to or greater than threshold value given in advance (result is a "Yes"), and base station node B is transformed into the signaling of multistep time control command from the signaling of utilizing binary or three elementary time control commands so.
Multistep time control command has foregoing advantage: bigger step pitch makes it possible to be matched with current time deviation quickly, and also needn't be as necessary under the situation of binary or three metacommands by the higher level's and therefore slowly agreement mate step pitch.Therefore, be in situation under the threshold value given in advance for the main time deviation that occurs in practice, use binary or three metacommands of saving resource, and be equal to, or greater than under the situation of threshold value given in advance in the determined time deviation that does not more often occur, employ comparatively fast and multistep order more flexibly.
If definition for example has the threshold value of 3us, this makes base station node B to be 1us and periodically to be the time deviation 3us that utilizes under the situation of a time control command of every multiframe within binary or three multiframes of three elementary time control commands compensation in step pitch so, that is to say before subscriber terminal equipment UE A execution signal transmission subsequently.If according to foregoing method, for example determine that by base station node B the time deviation of the signal of subscriber terminal equipment UE A is 5us, this means that so the threshold value that surpassed 3us and base station node B can be correspondingly be converted to the signaling of the multistep order that is used to compensate this time deviation from current binary or ternary command signaling.
This conversion of the form of the necessary recognition command signaling of subscriber terminal equipment UE A is so that can correspondingly realize these orders.According to the present invention, this identification can be carried out with different types and mode.Therefore can be for example by being arranged on the ISO-OSI layer model physical layer or more high-rise on the mode bit of signaling message give subscriber terminal equipment UE A with the conversion of command format or to the ground, dominance ground that for example surpasses of this threshold value with signaling.At this, described mode bit can for example upward be transmitted at the channel that is used for a plurality of subscriber terminal equipments jointly (English: shared channel (shared channel) or common channel (common signal channel)) in physical layer (the 1st layer) or link layer (the 2nd layer).
In addition replacedly, also can constantly attempt receiving or detecting the multistep order from subscriber terminal equipment UE A one side, that is to say, can distinguish aspect their content binary or three metacommands and multistep signal by this subscriber terminal equipment, thereby in this case, needn't carry out dominance signalingization to this conversion from base station node B one side.This can also only carry out with periodic interval where necessary from subscriber terminal equipment UE A one side, and in other words, this subscriber terminal equipment is attempted for example detecting the multistep order every two frames, and therefore discovers the command format conversion of being carried out by this base station.In an identical manner, this subscriber terminal equipment is discovered and is changed back binary or ternary command signaling.Advantageously limited the processing of the power consumption in subscriber terminal equipment UE A thus.
According to another replacement scheme, if subscriber terminal equipment UE A receive base station node B have time deviation big for the former signal that receives or surpass the time deviation of threshold value signal (below can contrasting to Fig. 5 explanation) even and also suppose temporal reciprocity when using different frequency between the transmission in up link UL and down link DL, then subscriber terminal equipment UE A can independently determine the conversion of command format, and should detect and correspondingly match.In addition, subscriber terminal equipment UE A for example also can be towards the signal of pilot channel, synchronizing channel or broadcast channel.
Be alternative in above-mentioned expansion scheme in addition, also can change like this or additional known signaling (being used to define the step pitch and the periodicity of binary command as these signalings), make and under the situation of stride value of determining and/or periodicity value, use signaling recessively: use the multistep order in base station side subsequently to this subscriber terminal equipment.
The front at the described process in accordance with the present invention of Fig. 4 especially for need being favourable for changing subscriber terminal equipment or the connection that strong time drift reacts rapidly.These are the subscriber terminal equipments in the RRC connection mode of for example business (for example video Data Transmission) in so-called active RRC connection mode (RRC Connected Active Mode) or that have sensitivity aspect transmission delay.
Flow chart form shown in Figure 5 according to a second embodiment of the method according to the invention, this second embodiment is once more based on aforesaid initial situation.According to this embodiment, subscriber terminal equipment UE A receives the signal of base station node B, wherein subscriber terminal equipment UE A is currently located among its radio plot ZA, and is controlled in transmission in time from the up link to base station node B according to the principle of open adjustable ring.This can be the signal of pilot channel, synchronizing channel or broadcast channel for example, and described signal is sent with high relatively transmitting power by base station node B, and makes subscriber terminal equipment UE A to detect reliably.
In subscriber terminal equipment UE A, received signal or the strongest signal path are compared with the signal that received in the past or its time benchmark that is determined, and the relative time deviation between definite former signal that receives that receive and current.Subscriber terminal equipment UE A compares determined time deviation and threshold value given in advance subsequently.At this, this threshold value for example defines by standard criterion, perhaps sends subscriber terminal equipment UE A by the last level assembly of base station node B or this system with signaling as independent changeable value.
If this relatively draws determined time deviation less than this threshold value (result is a "No"), then in case of necessity under the situation of considering binary received or three elementary time control commands by base station node B, subscriber terminal equipment UE A according to known method to subsequently in up link the transmission of the signal among the UL carry out time control.
If this draws determined time deviation more on the contrary and is equal to or greater than threshold value given in advance (result is a "Yes"), so subscriber terminal equipment UE A in up link, at first do not send other signal to base station node B, but carry out new synchronization program.What this was new is significant synchronously, because the detection probability of the signal that is transmitted in up link UL is reduced greatly owing to big time deviation subsequently.
If subscriber terminal equipment UE A carries out for example RACH program of so-called asynchronization (RACH-Random Access Channel (Random Access Channel)), that is to say, subscriber terminal equipment UE A according to open adjustable ring at first only by means of pilot channel, the signal that is received by base station node B of synchronizing channel or broadcast channel comes the control time to send, and in the access channel RACH of STOCHASTIC CONTROL, send one or more access message, then structure and the employed access message by access channel RACH improves the detection probability at base station node B place significantly.At this, contention based mode (based on the pattern of competition)) or non-competing ground (English: contention free mode (non-competing pattern)) carry out, that is to say in the resource of using access channel RACH (described resource exclusively keeps for this synchronization program or subscriber terminal equipment UE with already present connection) or be used for equally that other is functional (for example to be used for being used under the situation of resource of first access (English: initialaccess)) transmission that inserts message can be competed ground (English:.This can select according to state and/or the current business of supporting of subscriber terminal equipment UE A, perhaps by standard criterion or next given in advance by the system parameters of base station node B signalingization.
Be alternative in new synchronous direct transformation, as the with dashed lines encirclement illustrates among Fig. 5, at first utilize the signaling the up link UL also to inform base station node B from subscriber terminal equipment UE A one side: this threshold value is exceeded.In addition, subscriber terminal equipment UE A can at first utilize the autonomous coupling of signal transmission in time in up link UL is attempted compensating determined time deviation.And then, the signaling among the up link UL is analyzed by base station node B, compared by determine (as described in) with self where necessary at Fig. 4, and decision when correct or consistent, subscriber terminal equipment UE A should carry out new synchronization program.At next step, this gives subscriber terminal equipment UE A with signaling, thus described base station node B foregoing new synchronization program of initialization after analyzing this signaling.For signalingization, can for example change like this or additional known signaling, as be used to define the step pitch and the periodic signaling of binary command, make in the stride value of determining and/or periodically send signaling to carry out new synchronization program to subscriber terminal equipment UE A under the situation of value recessively.
Be alternative in or be complemented at the method step among Fig. 5, when determining determined time deviation and be equal to or greater than this threshold value, subscriber terminal equipment UE A can under any circumstance at first attempt carrying out the autonomous coupling to signal transmission in time in up link UL, its objective is determined time deviation is compensated.If this utilizes in up link UL to the signal that base station node B sent and achieves success, then base station node B proceeds the signalingization of binary or three elementary time control commands, perhaps when bigger deviation, proceed conversion, be not performed yet be used for new synchronous program to the multistep order.After receiving the time control command, subscriber terminal equipment UE A will use the time deviation of autonomous compensation as new fiducial value, and from this fiducial value, send corresponding to the order of the signalingization that is used for sending subsequently and to the time and mate.If on the contrary, this autonomous compensation is unsuccessful, proceeds former at the described method step of Fig. 5 so.
At the described process in accordance with the present invention of Fig. 5 is favourable for subscriber terminal equipment or the connection that needn't make rapid reaction to the time drift of strong variations especially.These are for example in so-called dormancy RRC connection mode (RRC connected Dormant Mode) or have a subscriber terminal equipment in the RRC connection mode of business (such as profile download) of tolerance transmission delay.
Also can advantageously make up mutually at Fig. 4 and the described method step of Fig. 5, for example as follows, promptly both in base station node B, also in subscriber terminal equipment UE A, determined time deviation separately, and according to this between them aspect the further exchange of time control command or new synchronization program is being carried out coordinating aspect the initialization.At this, especially foregoing threshold value can be variously defined, for example be variously defined aspect the following meaning: when surpassing first threshold, carry out from binary or three elementary time control commands to the conversion of multistep time control command with when surpassing the second higher threshold value, carry out new synchronization program.
Under the situation of the use control command of having stated in front, making utilizes the ternary value (to that is to say that signaling bit has for example three states (+1,0 ,-1)) can be with desirable time control or the variation signalingization on " early ", " no change ", " slower " meaning.This advantage that especially has for known two mega signalingizations is: even (that is to say in the transmission that changes subscriber terminal equipment UE A in time according to the original not needs of determined time deviation, time deviation is less than maximum time deviation given in advance) time, utilizing two mega signalings also to be merely able to will " early " and " slower " two status signalingization, as for example at more or less fixing terminal equipment, little radio plot, perhaps may occur during the small speed of the vertical moving direction of this terminal equipment like that, only can signalingization " early " and " slower ".In this case, from the signalingization to " early " and " slower " that base station node B one side's execution cycle property replaces, described signalingization may cause permanent coupling and cause higher energy consumption thus in subscriber terminal equipment.But the state " no change " by the 3rd signalingization can be used the signaling subscriber terminal equipment: should not mate the temporal transmission of the signal in the up link.
Be alternative in and use unique signaling bit, also can for example have three states 11 " early ", 00 " later " and 10 and/or 01 " no change " for identical two signaling bits of three time control command definition with three states.In addition, the third state " no change " also can alternatively be implemented on the meaning of discontinuous transmission DTX (discontinuous transmission) by the transmission of inhibition time control command.This means that although if according to the transmission structure of ordering, subscriber terminal equipment is former should to receive this order, subscriber terminal equipment receives order from the base station, and this base station is not transmitted this and is interpreted as order " no change " so.
Described time control command respectively based on step pitch can for example on the basis of radio plot, be defined or also can be defined individually by subscriber terminal equipment.If for time synchronized control being used the dedicated channel (promptly under already present connection situation) among the up link UL, so for example the order of following in succession " no change " of given number can be used the signaling subscriber terminal equipment: the order " early " or the step pitch of " slower " are reduced or are increased, and/or the periodicity in the time interval of Synchronization Control is reduced, that is to say that the time control command is less by signalingization.For the method for known two mega signalingizations, this does not advantageously need the signalingization on higher level special-purpose and that therefore cause system load to improve for subscriber terminal equipment.In addition advantageously, not only one side all can not carry out velocity estimation to subscriber terminal equipment from a subscriber terminal equipment side itself but also from the base station, and this is essential for known two mega signalingizations.
Claims (10)
1. one kind is used to control the signal transmission in time of subscriber terminal equipment (UE A) so that locate the method that time synchronized ground receives in the base station of radio communications system (Node B), wherein
When the determined time deviation of the signal of having determined to be received is equal to or greater than threshold value given in advance, base station (Node B) is used to control subscriber terminal equipment (UE A) transmission in time from the one-step control command conversion to the multistep control command, perhaps subscriber terminal equipment (UE A) carries out initialization to synchronization program under the situation of the access channel that uses STOCHASTIC CONTROL.
2. method according to claim 1, wherein binary or ternary signaling bit are used as the one-step control order.
3. method according to claim 1 and 2 is wherein determined described time deviation by base station (Node B) and/or subscriber terminal equipment (UE A).
4. according to the described method of one of aforementioned claim, wherein the time of reception and the time reference by the signal that will be received compares to determine described time deviation.
5. according to the described method of one of aforementioned claim, wherein when selecting whether should to carry out the conversion of control command or should carry out initialization, take in to the current state of subscriber terminal equipment (UE A) and/or to the type of service of the existing connection of subscriber terminal equipment (UE A) to synchronization program.
6. a signal transmission in time that is used to control subscriber terminal equipment (UE A) is wherein used three elementary time control commands by base station (Node B) so that locate the method that time synchronized ground receives in the base station of radio communications system (Node B).
7. the base station of radio communications system (Node B) has
At least one transmission/receiving system (SEE), be used in up link (UL) from least one subscriber terminal equipment (UE A, UE B) received signal, and be used for the transmitting time control command and the transmission in time of signal subsequently of at least one subscriber terminal equipment (UE A) controlled being used for, and
At least one control device (ST), be used for determining time deviation from the signal that is received, with be used for determined time deviation and threshold value given in advance compared and be used for when determined time deviation is equal to or greater than threshold value given in advance the one-step control command conversion to the multistep control command.
8. the subscriber terminal equipment of radio communications system (UE A) has
At least one transmission/receiving system (SEE) is used for sending signal in up link (UL) at least one base station (Node B) of radio communications system, and be used for down link (DL) from described base station (Node B) received signal, and
At least one control device (ST), be used for determining time deviation from the signal that is received, determined time deviation and threshold value given in advance are compared and be used for when determined time deviation is equal to or greater than threshold value given in advance, under the situation of the access channel that uses STOCHASTIC CONTROL, synchronization program being carried out initialization with being used for.
9. subscriber terminal equipment according to claim 8 (UE A), wherein
Described at least one control device (ST) is configured, and is used for considering under the situation of determined time deviation the transmission subsequently of (Node B) to the base station of control signal in time.
10. radio communications system has at least one base station according to claim 7 (Node B) and subscriber terminal equipment according to claim 8 (UE A).
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| EP06460034.9 | 2006-10-04 | ||
| EP06460034 | 2006-10-04 | ||
| EP06022237.9 | 2006-10-24 |
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| CN101548487A true CN101548487A (en) | 2009-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001367A1 (en) * | 2018-06-28 | 2020-01-02 | 华为技术有限公司 | Time information correction method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001367A1 (en) * | 2018-06-28 | 2020-01-02 | 华为技术有限公司 | Time information correction method and device |
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