CN101296024A - Uplink Synchronization method for one-way service in mobile communication system - Google Patents
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Abstract
The invention provides an uplink synchronization method of a one-way traffic in a mobile communication system, which can include the following steps: a terminal periodically sends uplink signals to a base station when only a downlink one-way traffic exists; and the base station estimates time advance on the basis of the received uplink signals, and then carries out the renewal process of the periodic time advance. Therefore, by adopting the method of the invention, network access can be more quickly realized in the process of receiving the one-way traffic so as to improve the customer satisfaction to the services, thus maintaining the synchronization of the uplink.
Description
Technical field
The present invention relates to the distributed cellular wireless telecommunication system, more specifically, relate to the uplink synchronisation method of one way traffic in a kind of mobile communcations system.
Background technology
With reference to figure 1, the distributed cellular wireless telecommunication system mainly comprises terminal, base station and core net.The connection of logic or physics can be arranged between the base station as required, and the network that the base station is formed is called wireless access network (RAN), is responsible for the Access Layer affairs, and for example, the management of Radio Resource and the Radio Resource of up-downgoing are according to the scheduling of the mode of shared channel.Each base station can link to each other with one or more than one core net node (CN).Core net is responsible for the Non-Access Stratum affairs, for example, and mobile management etc.Terminal is meant the equipment that can carry out communication with network, for example mobile phone or notebook computer etc.Each terminal can only be connected to a base station in the network on up direction.
At present up-to-date distributed mobile communcations system-long evolving system (being called for short LTE) adopts many toes of frequency orthogonal access technology (being called for short OFDMA) on down direction, and adopts many toes of single carrier frequency division access technology (being called for short SC-FDMA) on up direction.More than two kinds in the toe technology, schedulable wireless resource block is a limited common factor in frequency domain and the time domain scope, as shown in Figure 2 at this.This Resource Block is 12 subcarriers on frequency domain in present LTE system, and each subcarrier is 15KHz (KHz), is 1 millisecond on time domain, is the same with the width of a subframe.In addition, the length of system-frame is 10 milliseconds in the LTE system, and that is to say has 10 subframes in the frame.
With reference to figure 3, suppose that the base station has sent a data block DATA1 at 2 work song frames of certain frame to terminal, terminal is because obtained down-going synchronous, so also can receive DATA1 in identical subframe, but because the propagation delay time of radio wave, the starting point of No. 2 frames is prolonged a period of time after wanting on the terminal, is the same with unidirectional propagation delay time during this period of time.Suppose that terminal replys a DATA2 at 4 work song frames, if terminal sends DATA2 in the starting point of sub-frame of uplink, same because the propagation delay time of radio wave, DATA2 can just not drop on the base station 4 work song frames scope in, but can extend to the scope of 5 work song frames.This not only can have influence on the reception of other data block in the time domain of 5 work song frame correspondences, and can have influence on the demodulating process of DATA2 itself.
If the position of receive window is adjusted in the base station according to the needs of each terminal temporarily, so not only the design of receiver will be very complicated, and make the scheduling of Radio Resource become in disorder, so always being desirably in, the base station receives up data block in the regular time scope.Under such prerequisite, the method of system's reply propagation delay time is, allow terminal shift to an earlier date certain period when sending uplink data block, this period just in time is 2 times of propagation delay time between base station and the terminal, and this period that is shifted to an earlier date is called Timing Advance (being called for short TA).With reference to figure 3, the DATA2 that dotted line is represented has shifted to an earlier date TA and has sent, and DATA2 just just in time drops on 4 work song frames.
As shown in Figure 4, form by an integer modulation symbol in a subframe among the LTE, such as 14 modulation symbols.The transmission of whole subframe in advance just means also in the subframe that each transmission of adjusting symbol in advance.Some is called Cyclic Prefix (being called for short CP) front end of a modulation symbol, the content of the content of this part and this modulation symbol last part, and promptly the part RP among the figure is the same.
With reference to figure 5, in theory, certain modulation symbol that terminal sends allows in advance or falls behind the scope of a CP of symbol receive window at most, as long as because exceed the scope that the part of window is no more than a CP, the part that exceeds window so can be remedied by part corresponding in the window, with reference to 5_1 and the 5_2 of figure 5.Yet because the complexity that actual wireless is propagated, such as multipath and rapid fading, the part that allows to depart from is wanted much less, 5_3 in the reference diagram and 5_4.Such as in the LTE system, allow the time difference in about OFDM sampling period of departing from, more much smaller than the length of CP.For convenience, the period of departing from of system's permission is called Tab.
Set up between terminal and the base station before the communication relation, terminal can be at first resident to certain sub-district.Terminal can obtain at first that descending terminal could receive the information on the descending common signal channel so synchronously by cell search process, such as broadcast message, and paging information etc.At this moment, terminal also do not obtain up synchronously.
With reference to figure 6, when terminal makes a call or the paging of response to network the time, terminal can at first send a random accessing message.The frame structure of this message comes shortly than normal frame on time domain, can be called to insert frame at random.When receive when inserting frame at random the base station, can drop on position in the random access time slot receive window according to frame and judge bidirectional propagation delay between base station and the terminal.This bidirectional propagation delay can be used as the later initial TA of accessing terminal to network.The base station can feed back to terminal to this initial TA value when replying random accessing message, and terminal has just obtained up synchronous like this.
In the communication process afterwards, run off the receive window of regulation, need a process of bringing in constant renewal in TA between base station and the terminal in order to prevent data that terminal sends.In general, new TA can be estimated according to the upward signal that terminal sends in the base station, then new TA is sent to terminal.This process is called the renewal process of TA.Because terminal can be with high-speed motion, if untimely renewal TA, the variation of the propagation delay time that distance caused that moves of terminal just may exceed the Tab that above mentions so.Supposing the system can be supported to be up to 500 kilometers/hour radial motion, and the period that allows to depart from is 0.52 microsecond, and the maximum cycle that allows so to upgrade is 560 milliseconds.In order to tackle all unfavorable situations, system can be provided with a relatively more fixing maximum update cycle, abbreviates MTu as.
Because whether terminal moves and can't predict in advance, so, in order to keep up synchronized relation, have to suppose that terminal is in the moving process, always so TA also needs periodic renewal, even in fact terminal does not move from the angle of base station.Identical reason, judge terminal whether lost up synchronously, also will be based on the TA that whether upgraded in time.For the base station, can correctly receive up data, can think to have illustrated that indirectly the TA value that terminal keeps is correct.If so the base station is found perhaps correctly to receive after the up data last time, can not upgrade TA again in the time after last TA renewal, so just can think that terminal has lost synchronously at MTu; And for terminal,, after MTu, can not upgrade TA again if after receiving TA and upgrade last time, so also can think terminal lost up synchronously.
For the terminal that loses uplink synchronous,, all need to regain initial TA by the method that inserts at random again if resend data or receive data.
As if when having only descending one way traffic, terminal receives only descending data, do not need to seem the renewal process of TA.But in order to improve utilization ratio of wireless resources, terminal needs feedback channel quality order report (being called for short CQI REPORT).The base station can utilize CQI REPORT to carry out power control or carry out the radio link adaptation control procedure.In order to guarantee the validity of CQI REPORT, the report cycle of CQI REPORT can be shorter, even this just requires terminal when receiving descending one way traffic, also need to keep up synchronously.
Therefore, be badly in need of the uplink synchronous problem that a kind of method solves one way traffic in mobile communcations system.
Summary of the invention
In order to address the above problem, the invention provides the uplink synchronisation method of one way traffic in a kind of mobile communcations system, it can may further comprise the steps: having only under the situation of descending one way traffic, terminal periodic ground sends upward signal to the base station; And the base station comes the evaluation time lead according to receiving described upward signal, carries out the periodically renewal process of Timing Advance then.
When descending one way traffic adopted discontinuous transmission technology, this method can comprise following processing: terminal is only sending upward signal when sleep state is waken up.
When descending one way traffic adopts discontinuous transmission technology, and the cycle of discontinuous transmission surpass maximum duration lead that mobile communcations system allows during the update cycle, comprise following processing: terminal does not send upward signal.
Wherein, descending one way traffic comprises descending multimedia broadcast-multicast service.
When descending one way traffic was descending multimedia broadcast-multicast service, upward signal was the response reference signal.
Thereby, by the present invention, when terminal has only descending one way traffic, for access network quickly in receiving the process of one way traffic, improve user's professional satisfaction, send upward signal to the base station by sending periodically, thus kept up synchronously.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of distributed cellular wireless telecommunication system of the prior art;
Fig. 2 is the schematic diagram of wireless resource block;
Fig. 3 is the physical schematic of Timing Advance;
Fig. 4 is the structural representation of wireless-modulated symbol;
Fig. 5 is the schematic diagram that the wireless-modulated symbol departs from receive window;
Fig. 6 is the schematic diagram that terminal obtains the process of initial TA;
Fig. 7 is the flow chart according to the uplink synchronisation method of one way traffic in the mobile communcations system of the present invention;
Fig. 8 is the schematic diagram of TA renewal process;
Fig. 9 be according to first embodiment of the invention have only MBMS professional the time the schematic diagram that upgrades of TA; And
Figure 10 has only the professional schematic diagram that the TA when but DRX is arranged upgrades of MBMS according to second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 7 is the flow chart according to the uplink synchronisation method of one way traffic in the mobile communcations system of the present invention.As shown in Figure 7, this method may further comprise the steps:
Step S702 is having only under the situation of descending one way traffic, and terminal periodic ground sends upward signal to the base station; And
Step S704, the evaluation time lead is come according to receiving described upward signal in the base station, carries out periodicity Timing Advance renewal process then.
When descending one way traffic adopted discontinuous transmission technology, this method can comprise following processing: terminal is only sending upward signal when sleep state is waken up.
When descending one way traffic adopts discontinuous transmission technology, and the cycle of discontinuous transmission surpass maximum duration lead that mobile communcations system allows during the update cycle, comprise following processing: terminal does not send upward signal.
Wherein, descending one way traffic comprises descending multimedia broadcast-multicast service.
When descending one way traffic was descending multimedia broadcast-multicast service, upward signal was the response reference signal.
Fig. 8 is the schematic diagram of TA renewal process.Why more the base station key factor of the TA of new terminal, is because the measurement that TA changes can be carried out according to up signal in the base station.
When only having downlink business between terminal and the base station, when having only the MBMS business, terminal needs feedback channel quality indication (being called for short CQI REPORT).The base station can utilize CQI REPORT to carry out the operation of power control or link circuit self-adapting.If the report cycle of CQI REPORT is long, the reference value of these data that report will descend greatly so, and this is because the variation of wireless channel is very fast.That is to say that the cycle of terminal to report CQI REPORT is unsuitable long in order to allow the CQI REPORT that reports play effect conscientiously.Such as, if use as the link circuit self-adapting process, the rank of general a few tens of milliseconds in cycle so.Terminal need report CQI REPORT in relatively shorter blanking time, just need terminal to remain on the state of uplink synchronous always, reports CQI REPORT all to need a random access procedure to obtain initial TA in the past else if at every turn.May bump because have access at random, so can cause extra delay.And in order to estimate initial TA exactly, the bandwidth of Random Access Channel has a lower limit, this lower limit is 1.25MHz in LTE, this bandwidth is compared with the channel width that reports CQI REPORT and is wanted big many, if so report CQI REPORT all to adopt random access procedure in the past at every turn, not only incur loss through delay CQI REPORT on call time, and can consume more Radio Resource.When descending one way traffic adopts discontinuous transmission (being called for short DTX) technology, terminal will adopt discontinuous reception (being called for short DRX) technology, so that prolong the service time of battery.At this moment the report cycle of CQI REPORT can be received the constraint in terminal D RX cycle, but as long as DRX cycle is no more than the cycle that the maximum TA of system's permission upgrades, control still has reference value to the CQI REPORT that reports for power, so in this case because same reason, terminal also need to keep up synchronously.If DRX cycle has exceeded the maximum TA update cycle that system allows, terminal just there is no need to send upward signal more so because terminal when sleep state is waken up, always can think lost up synchronously.
The way that solves is to have only under the scene of descending one way traffic, allows the up signal of terminal periodic transmission to the base station.Periodicity TA renewal process can be carried out then by receiving the estimation process that these up signals carry out TA in the base station.
If descending one way traffic adopts the discontinuous transmission technology of (being called for short DTX), that is to say that terminal is in the state of discontinuous reception (DRX).In order not destroy the process of normal DRX, terminal should only send up signal in terminal when sleep state is waken up.
Fig. 9 be according to first embodiment of the invention have only MBMS professional the time the schematic diagram that upgrades of TA.As shown in Figure 9, when having only descending MBMS business, terminal can periodically send special-purpose response reference signal (hereinafter to be referred as sounding referencesignal) and give the base station.Up TA is estimated by receiving sounding reference signal in the base station, sends the TA update command then to terminal.
Figure 10 has only the professional schematic diagram that the TA when but DRX is arranged upgrades of MBMS according to second embodiment of the invention.As shown in figure 10, when having only descending MBMS business, and MBMS has the mode of operation of two kinds of DRX.The cycle of short DRX is 240 milliseconds, and long DRX cycle is 420 milliseconds.When terminal was in 240 milliseconds DRX pattern, terminal sent sounding referencesignal to the base station every the cycle of two DRX, and the update cycle that is to say TA is 480 milliseconds.When terminal was in 420 milliseconds DRX pattern, the step of terminal and DRX was consistent, that is to say each 420 milliseconds of renewal process of carrying out a TA.
In sum, adopt method of the present invention, can be in receiving the process of one way traffic access network quickly, improve user's professional satisfaction, thus keep up synchronously.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the uplink synchronisation method of one way traffic in the mobile communcations system is characterized in that,
May further comprise the steps:
Having only under the situation of descending one way traffic, terminal periodic ground sends upward signal to described base station; And
The evaluation time lead is come according to receiving described upward signal in described base station, carries out the renewal process of Timing Advance then.
2. uplink synchronisation method according to claim 1 is characterized in that, when described descending one way traffic adopts discontinuous transmission technology, comprises following processing:
Described terminal is only sending upward signal when sleep state is waken up.
3. uplink synchronisation method according to claim 1, it is characterized in that, when described descending one way traffic adopts discontinuous transmission technology, and the cycle of discontinuous transmission surpass maximum duration lead that described mobile communcations system allows during the update cycle, comprise following processing:
Described terminal does not send described upward signal.
4. uplink synchronisation method according to claim 1 is characterized in that, described descending one way traffic comprises descending multimedia broadcast-multicast service.
5. uplink synchronisation method according to claim 1 is characterized in that, when described descending one way traffic was described descending multimedia broadcast-multicast service, described upward signal was the response reference signal.
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| WO2011020426A1 (en) * | 2009-08-17 | 2011-02-24 | 中兴通讯股份有限公司 | Method and system for uplink signal synchronization |
| CN101990282B (en) * | 2009-08-04 | 2014-02-05 | 联芯科技有限公司 | Method and device for improving performance of receiver |
| CN103582109A (en) * | 2012-07-23 | 2014-02-12 | 京信通信系统（中国）有限公司 | Method and device for synchronizing time |
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| CN109246754A (en) * | 2017-01-04 | 2019-01-18 | 华为技术有限公司 | A kind of communication means and its terminal device, the network equipment |
| CN109246754B (en) * | 2017-01-04 | 2019-10-22 | 华为技术有限公司 | A communication method, terminal device and network device thereof |
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Application publication date: 20081029 |