CN102647783A - Control method for uplink time advance, base station, and terminal - Google Patents

Abstract

The invention provides a control method for uplink time advance, a base station and terminals, which aim at solving the problem of large-coverage-radius communication. The method comprises the following steps of: detecting a random access signal from each terminal; computing uplink transmission delay according to the random access signal, and computing an uplink time adjustment value of the terminal; confirming a delay range of the uplink transmission delay and an adjustment factor/adjustment factor indication information corresponding to the delay range; and sending random access response carrying the uplink time adjustment value and the adjustment factor/adjustment factor indication information to the terminal, and computing the uplink time advance by the terminal according to the uplink time adjustment value and the adjustment factor/adjustment factor indication information. According to the invention, the control on the uplink time advance in a large coverage area is achieved; and further, according to the distances between the terminals and the base station, the base station selects the suitable adjustment factors N for the different terminals requiring to access, therefore, the uplink time advance of each terminal is more accurate.

Description

A kind of control method of up Timing Advance and base station, terminal

Technical field

The application relates to mobile communication technology, particularly relates to a kind of control method and base station, terminal of up Timing Advance.

Background technology

After UE (terminal) start, at first need set up synchronously with the sub-district.Because when UE inserts; Though can receive PSS (main synchronizing sequence)/SSS (secondary synchronization sequences) signal of base station, set up down-going synchronous, and do not know and the base station between distance; This will cause the up transmission of UE can not arrive the base station synchronously, therefore need set up uplink synchronous.Uplink synchronous is set up the initial random access procedure of the system that is generally used for, and after system lost uplink synchronous when perhaps switched the sub-district, rebulids synchronous process and also will pass through uplink synchronous and set up process.

Set up in the process in uplink synchronous, base station side needs to go up line time adjusted value TA (Timing Advance) notice UE, sets up uplink synchronous so that UE calculates up Timing Advance according to TA.

In 3G (Third Generation) Moblie long evolving system (LTE, Long Term Evolution), the maximum covering power of sub-district is 100km (km).But in some scene, for example cover the movable spatial domain of civilian aircraft, the marine site of steamer and drilling platforms, magnetic suspension train, high-speed railway all are that following networking covers indispensable part.And these application scenarioss belong to typical covering constrained system, and the maximum covering radius of sub-district will be greater than 100km.

If radius of society is different in the uplink synchronous, it is differentiated need notifying the value of the TA of UE in base station side, if radius of society surpasses 100km, even greater than 200km, corresponding TA value will be a lot of greatly.

At 2G (GSM; Global System of Mobile communication; Global system for mobile communications)/3G (TD-SCDMA; The mechanism that up Timing Advance is all arranged during Time Division-Synchronous Code Division Multiple Access, TD SDMA) system realizes, for example:

In GSM, during calling was carried out, travelling carriage was issued the time delay value that carries moving table measuring on the measurement report head of base station; And the time that the necessary supervising connections for calling in base station arrives, and on down channel, send instruction to travelling carriage, the time that the indication travelling carriage sends in advance with 480ms frequency once; This time is exactly TA; The codomain of TA is 0-63 (0-233 μ s), and it is limit by the coding 0-63bit that GSM regularly shifts to an earlier date, and making the GSM largest coverage distance is 35km.

In TD-SCDMA; NodeB (base station) carries out synchronous detecting to the upstream data that subscriber equipment sends; And the decision subscriber equipment sends the transmission timing advance TA of the required employing of upstream data next time, and according to the TA indication signaling that is provided with in the base station and send to UE.

No matter be GSM or TD-SCDMA, the realization Timing Advance of standard does not all support big overlay area, especially radius of society to surpass the scene of 100km.

Therefore, need to solve big covering radius at present, like the problem of controlling greater than the up transmission Timing Advance of 100Km.

Summary of the invention

The application provides a kind of control method and base station, terminal of up Timing Advance, to solve the problem of big covering radius communication.

In order to address the above problem, the application discloses a kind of control method of up Timing Advance, comprising:

Detect the accidental access signal of self terminal;

Calculate the uplink time delay according to said accidental access signal, and calculate the last line time adjusted value at terminal;

Confirm the time delay scope under the said uplink time delay, and confirm the adjustment factor/adjustment factor indication information that should the time delay scope;

Send to the terminal with carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information, the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably; The said time delay scope of confirming that said uplink time delay is affiliated; And confirm the adjustment factor/adjustment factor indication information that should the time delay scope; Comprise: whether judge said uplink time delay smaller or equal to predetermined threshold value, if smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2; Wherein, the N1 of the expression adjustment factor is natural number less than N2; The N1 and the N2 of expression adjustment factor indication information are 0 or 1.

Preferably, in the LTE system, when said predetermined threshold value was 0.667 millisecond, the N1 of the expression adjustment factor was 16, and the N2 of the expression adjustment factor is 32.

Preferably; The said accidental access response that will carry said upward line time adjusted value and adjustment factor indication information sends to the terminal; Comprise: in the LTE system; The said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place; The accidental access response that carries said timing adjustment instruction is sent to the terminal.

Preferably; The said time delay scope of confirming that said uplink time delay is affiliated; And confirm the adjustment factor/adjustment factor indication information that should the time delay scope; Comprise: whether judge said uplink time delay smaller or equal to first predetermined threshold value,, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1 if smaller or equal to said first predetermined threshold value; If greater than said first predetermined threshold value and smaller or equal to second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2; If greater than said second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N3; Wherein, the N1 of the expression adjustment factor is less than N2, and N2 is natural number less than N3.

Preferably, in the LTE system, the span of said upward line time adjusted value is constant to be 0～1282.

The application also provides a kind of control method of up Timing Advance, comprising:

Send accidental access signal to the base station;

Reception is from the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information of base station;

From said accidental access response, extract line time adjusted value and the adjustment factor/adjustment factor indication information;

Calculate up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably, said line time adjusted value and the up Timing Advance of adjustment factor calculation gone up of said foundation comprises: calculate up Timing Advance: NTA=TA * NT according to following formula _sWherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

Preferably, the said line time adjusted value of going up of said foundation calculates up Timing Advance with adjustment factor indication information, comprising: confirm the corresponding adjustment factor according to said adjustment factor indication information; Calculate up Timing Advance: NTA=TA * NT according to following formula _sWherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

Preferably, in the LTE system, the span of said upward line time adjusted value is constant to be 0～1282; The said adjustment factor is 16 or 32.

The application also provides the up Timing Advance control method under a kind of large coverage, comprising:

Send accidental access signal to the base station;

Reception is from the accidental access response that carries the line time adjusted value of base station;

From said accidental access response, extract the line time adjusted value;

With the acquiescence value is that 32 the adjustment factor multiply by the product of systematic sampling time, multiply by the said line time adjusted value of going up again, obtains up Timing Advance.

The application also provides a kind of base station of controlling up Timing Advance, comprising:

Detection module is used to detect the accidental access signal of self terminal;

Computing module is used for calculating the uplink time delay according to said accidental access signal, and calculates the last line time adjusted value at terminal;

Determination module is used for confirming the time delay scope under the said uplink time delay, and confirms the adjustment factor/adjustment factor indication information that should the time delay scope;

The response sending module; Be used for carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information and send to the terminal, the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably, said determination module comprises:

Decision sub-module is used to judge that whether said uplink time delay is smaller or equal to predetermined threshold value;

Matched sub-block, if be used for smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

Wherein, the N1 of the expression adjustment factor is natural number less than N2; The N1 and the N2 of expression adjustment factor indication information are 0 or 1.

Preferably, in the LTE system, the said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place; The accidental access response that said response sending module will carry said timing adjustment instruction sends to the terminal.

The application also provides a kind of terminal of controlling up Timing Advance, comprising:

AM access module at random is used for sending accidental access signal to the base station;

The response receiver module is used to receive the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information from the base station;

Extraction module is used for extracting line time adjusted value and the adjustment factor/adjustment factor indication information from said accidental access response;

Computing module is used for calculating up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably, in the LTE system, the span of said upward line time adjusted value is constant to be 0～1282; The said adjustment factor is 16 or 32.

The application also provides the terminal of the up Timing Advance of control under a kind of large coverage, comprising:

AM access module at random is used for sending accidental access signal to the base station;

The response receiver module is used to receive the accidental access response that carries the line time adjusted value from the base station;

Extraction module is used for extracting the line time adjusted value from said accidental access response;

Computing module, being used for the acquiescence value is that 32 the adjustment factor multiply by the product of systematic sampling time, multiply by the said line time adjusted value of going up again, obtains up Timing Advance.

Compared with prior art, the application comprises following advantage:

At first, through changing the value of adjustment factor N, solved under the large coverage control problem of (in the LTE system greater than 100km scope) up Timing Advance.

Secondly, suitable adjustment factor N also can be selected for the different terminals that request inserts according to the distance of terminal apart from the base station in the base station, makes terminal up Timing Advance separately more accurate.In the practical application, if terminal asks to insert in apart from the scope of base station 100km (km), the value of the base station N that judges out should be 16 so; If (greater than the 100km) request in the distance scope of same base station 200km of another terminal inserts, this moment, the value of the N that this base station is judged should be adjusted into 32.Like this, for a base station, can dynamically adjust the value of N apart from the distance of base station, thereby let the different terminals that inserts same base station carry out uplink synchronous with more accurate up Timing Advance separately according to the terminal.

Once more, reserved place transmission adjustment factor indication information is used in the base station, does not change the communication protocol of base station and terminal room, does not also change frame structure, more need not to change terminal equipment, realizes simple.

Certainly, arbitrary product of enforcement the application not necessarily need reach above-described all advantages simultaneously.

Description of drawings

Fig. 1 is the sketch map of different districts radius among the application embodiment;

Fig. 2 is the initial access delay sketch map of UE under the different districts radius among the application embodiment;

Fig. 3 be among the application embodiment under the different districts radius base station receive sketch map;

Fig. 4 be in the said a kind of LTE of the application embodiment system base station side to the control method flow chart of up Timing Advance;

Fig. 5 be in the said a kind of LTE of the application embodiment system end side to the control method flow chart of up Timing Advance;

Fig. 6 is the flow chart that the said a kind of LTE uplink random of the application embodiment inserts;

Fig. 7 is the up Timing Advance control method flow chart under the large coverage in the said a kind of LTE of another embodiment of the application system;

Fig. 8 is the said a kind of architecture of base station figure that controls up Timing Advance of the application embodiment;

Fig. 9 is the said a kind of terminal structure figure that controls up Timing Advance of the application embodiment;

Figure 10 is the terminal structure figure of the up Timing Advance of control under the said a kind of large coverage of another embodiment of the application.

Embodiment

For above-mentioned purpose, the feature and advantage that make the application can be more obviously understandable, the application is done further detailed explanation below in conjunction with accompanying drawing and embodiment.

With reference to Fig. 1, be the sketch map of different districts radius.

As shown in Figure 1; Transmission has delay because signal is in the space; If UE moves to the direction away from the base station during calling out, the arrival UE that the signal that then sends from the base station will " more and more slower ", the arrival base station that meanwhile signal of UE also can " more and more slower "; It is overlapped to postpone the time slot that long meeting causes UE that the base station receives signal and the base station on this time slot to receive next other UE signal, causes intersymbol interference.

For this reason, up PRACH (Physical Random Access Channel, Physical Random Access Channel) targeting sequencing is at first sent at the terminal; When sending first access request; Always the time window with oneself is a benchmark, because space transmission has time-delay, so terminal signaling is when arriving the base station; Time window has dislocation, and is as shown in Figure 2.

The PRACH targeting sequencing is detected in the base station in search window, can estimate PRACH targeting sequencing due in.Estimate propagation delay time, calculate UE time adjusted value TA (Timing Advance), then; The base station is through RAR (Random Access Response; Accidental access response) sends feedback information to UE, provide UE time adjusted value TA, so that UE sets up uplink synchronous.Replying of time adjusted value will be made to UE in 4 sub-frame after receiving PRACH in the base station under the normal condition.

The time unifying of uplink to guarantee the orthogonality of upward signal between the UE, causes interference sub-district in thereby help to eliminate propagation delay times different between the UE through realizing with TA in the UE side.As shown in Figure 3, because radius of society is different, it is differentiated need notifying the value of the lead TA of UE in base station side, if radius of society surpasses 100km, even greater than 200km, corresponding TA value will be a lot of greatly.

The application proposes a kind of control method of up Timing Advance, can solve the communication issue under the large coverage.Through embodiment the realization flow of the said method of the application is elaborated below.

Uplink random inserts the access at random of the access (after losing uplink synchronous) that comprises initial access and switching when, and the access during switching is similar with initial access, is example with initial access mainly below.

With reference to Fig. 4, be in the said a kind of LTE of the application embodiment system base station side to the control method flow chart of up Timing Advance.

The handling process of base station is following:

Step 401, detection comes the accidental access signal of self terminal;

Up PRACH targeting sequencing (being carried in the accidental access signal) is at first sent at the terminal, and the PRACH targeting sequencing is detected in the base station in search window, if detect, then gets into step 402.

Step 402 is calculated the uplink time delay according to said accidental access signal, and calculates the last line time adjusted value at terminal;

In case the base station detects the PRACH targeting sequencing of self terminal, the base station just can estimate PRACH targeting sequencing due in.Then, estimate the uplink time delay, and go out the last line time adjusted value TA at terminal according to the uplink time-delay calculation.In the practical application, can preset the mapping relations of uplink time delay and last line time adjusted value TA in advance, when calculating a uplink, delay, can mate the TA value corresponding with its immediate uplink time delay.

In the LTE system, TA representes with 11 binary-coded character, so span is [0,1282].

Enumerate a kind of method of estimating the uplink time delay below, but should not be construed as qualification the application, specific as follows:

It is following that the base station receives the method for calculating transmission delay behind the signal of UE:

1) calls pilot frequency locations according to separating of each UE and distribute, extract and receive all pilot tones that each UE takies in the signal;

$h_{\mathrm{RS}}^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}=\{h_1^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m},h_2^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\·\·\·\·\·\·h_{N_p}^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\}$

m＝1，2 $k_{\mathrm{aV}}\∈{\mathrm{index}}_{\mathrm{vante}}^{k_{\mathrm{UE}}}$ $k_{\mathrm{aV}}^{\′}=1,\·\·\·,N_{\mathrm{vante}}^{k_{\mathrm{UE}}}$

Be user k _UEEmpty antenna number, N _pBe the pilot number of every row pilot tone of every empty antenna of user, m representes that every empty antenna has two row pilot tones, k _ARExpression reception antenna number.

2) ask the phase difference of the adjacent pilot frequency locations place channel impulse response of each symbol frequency domain, can obtain phase difference with conjugate multiplication;

${\mathrm{\φ}}_i^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}=\arctan (h_{i+1}^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\×\mathrm{conj}\left(h_i^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\right))$

i＝1：N _p-1

m＝1，2

$k_{\mathrm{aV}}^{\′}=1,\·\·\·,N^{k_{\mathrm{UE}}}$

3) estimating time bias sample;

Delay deviation between adjacent sub-carrier is:

$n_i^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}=\frac{{\mathrm{\φ}}_i^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\×N_{\mathrm{fft}}}{2\mathrm{\π}{L}_p}$

Wherein, L _pBe the subcarrier spacing of adjacent carrier, L in the existing system _p=1, N _FftThe number of expression FFT conversion.

4) ask average

$n^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}=\frac{1}{N_p-1}\underset{i=1}{\overset{N_{p-1}}{\mathrm{\Σ}}}{n}_i^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}$

5) dual-mode antenna and symbol are asked average

$j_{\mathrm{sync}-\mathrm{offset}}^{\mathrm{BS}}\left(k_{\mathrm{UE}}\right)=\mathrm{round}\left[\frac{1}{N_{\mathrm{Vante}}^{k_{\mathrm{UE}}}\×K_{\mathrm{aR}}\×2}\underset{k_{\mathrm{aV}}^{\′}=1}{\overset{N^{k_{\mathrm{UE}}}}{\mathrm{\Σ}}}\underset{K_{\mathrm{aR}}=1}{\overset{K_{\mathrm{aR}}}{\mathrm{\Σ}}}\underset{m=1}{\overset{2}{\mathrm{\Σ}}}{n}^{k_{\mathrm{UE}},k_{\mathrm{aR}},k_{\mathrm{aV}}^{\′},m}\right]$

Wherein, round () expression 4 houses 5 go into to round, and are worth for just representing the optimal synchronisation point that lags behind, and are worth to be the leading optimal synchronisation point of negative indication.

that obtain at last is the uplink time delay.

Step 403 is confirmed the time delay scope under the said uplink time delay, and confirms the adjustment factor/adjustment factor indication information that should the time delay scope;

Wherein, "/" expression " or ", what promptly determine can be the adjustment factor, also can be adjustment factor indication information.

In the practical application, using more is following situation:

Whether judge said uplink time delay smaller or equal to predetermined threshold value, if smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

Wherein, N1 and N2 both can represent to adjust the factor, also can represent to adjust factor indication information.When the expression adjustment factor, N1 is natural number less than N2; When expression adjustment factor indication information, N1 and N2 are 0 or 1, are 0 like N1, and N2 is 1, and is perhaps opposite, and N1 is 1, and N2 is 0.

When said predetermined threshold value was 0.667 millisecond, the N1 of the expression adjustment factor was 16, and the N2 of the expression adjustment factor is 32.

For example, in a single day the base station detects the targeting sequencing of self terminal, and the time of its arrival has also just been known so.The regularly instruction of adjustment is confirmed in the base station, and sends to the terminal in the accidental access response afterwards.Regularly the instruction of adjustment is the TA value of 11 bits and 1 adjustment factor indication information, and wherein this remaining 1 is reserved place, so TA is span: TA=[0,1282].

The terminal is according to the regularly instruction of adjustment, calculates corresponding up Timing Advance NTA to be:

NTA＝TA×16T _s；

The Δ T=16T that gives tacit consent among the LTE _s, Ts is the sampling time of system, Ts=32.55 μ s, and therefore the span of up Timing Advance is NTA=[0,0.667ms], the maximum uplink time delay of the covering radius that it is corresponding: the R=* light velocity=0.667ms*3*10 ⁸M/s=100km.

When radius of society surpassed 100km, the value of NTA=[0,0.667ms] can not satisfy system requirements; Therefore the value of Δ T need be adjusted in the base station; And notice gives the terminal, so that after the terminal receives TA value and adjust factor indication information accordingly, calculate according to following formula:

NTA＝TA×NT _s；

The radius that covers if desired is 200km; N=32 change the corresponding TA value in base station remains from 0 to 1282 like this, and up Timing Advance NTA scope is [0 so; 1.3354ms], the radius of society that this stylish adjustment relation can be supported down: R=1.3354ms*3*10 ⁸M/s=200km.

Need to prove that no matter the value of N is 16 or 32, the said span that goes up the line time adjusted value is constant to be 0～1282.

Except above-mentioned situation, also possibly there is the judgement of following situation:

Whether judge said uplink time delay smaller or equal to first predetermined threshold value,, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1 if smaller or equal to said first predetermined threshold value;

If greater than said first predetermined threshold value and smaller or equal to second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

If greater than said second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N3;

Wherein, the N1 of the expression adjustment factor is less than N2, and N2 is natural number less than N3.

For example, if the uplink time delay smaller or equal to first predetermined threshold value, then the corresponding district covering radius is 100km; If the uplink time delay is greater than said first predetermined threshold value and smaller or equal to second predetermined threshold value, then the corresponding district covering radius is 200km; If the uplink time delay is greater than said second predetermined threshold value, then the corresponding district covering radius is 300km.Certainly, 300km is the super large coverage radius of cell, uses less in the reality.

Step 404 sends to the terminal with carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information, and the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

The base station can or be adjusted factor indication information and issue the terminal the adjustment factor.

As previously mentioned, be under the situation of 200km at maximum coverage range, if send adjustment factor indication information, then can use above-mentioned reserved place, specifically:

The said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place;

The accidental access response that carries said timing adjustment instruction is sent to the terminal.

The benefit of above-mentioned use reserved place is: reserved place belonged to 1 in the regularly adjustment instruction originally; Therefore use reserved place to transmit adjustment factor indication information, can not change the communication protocol of base station and terminal room, also do not change frame structure; More need not to change terminal equipment, and realize simple.Certainly, if do not consider above factor, also can adopt other modes to transmit adjustment factor indication information.

Send the adjustment factor if desired, then can adopt other modes to send, for example in accidental access response, add data bit and represent to adjust the concrete value of the factor, directly issue the terminal 16 or 32.

Up Timing Advance is calculated according to following formula in the terminal:

NTA＝TA×NT _s；

Wherein, N can be 16, also can be 32.

With reference to Fig. 5, be in the said a kind of LTE of the application embodiment system end side to the control method flow chart of up Timing Advance.

The handling process at terminal is following:

Step 501 is sent accidental access signal to the base station;

After the base station receives said accidental access signal, handle, finally return accidental access response according to above-mentioned step 402,403 and 404.

Step 502 receives the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information from the base station;

As previously mentioned, "/" expression " or ", promptly can carry the adjustment factor in the accidental access response, as 16,32, also can carry adjustment factor indication information, like 0 in the reserved place or 1.

Step 503 extracts line time adjusted value and the adjustment factor/adjustment factor indication information from said accidental access response;

Step 504 is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

If what carry in the accidental access response is the adjustment factor, then calculate up Timing Advance according to following formula:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

In the LTE system, the span of said upward line time adjusted value is constant to be 0～1282.But the value of N can be 16, also can be 32.If coverage radius of cell surpasses 200km, then the value of N can be bigger.

If what carry in the accidental access response is adjustment factor information, then:

Confirming the corresponding adjustment factor according to said adjustment factor indication information earlier, is 0 like adjustment factor indication information, and the corresponding adjustment factor N of expression is 16, and adjustment factor indication information is 1, and the corresponding adjustment factor N of expression is 32;

Calculate up Timing Advance according to following formula then:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

In sum, the foregoing description has solved under the large coverage control problem of (in the LTE system greater than 100km scope) up Timing Advance.And, use reserved place not change the communication protocol of base station and terminal room, do not change frame structure yet, more need not to change terminal equipment, realize simple.

Further, suitable adjustment factor N also can be selected for the different terminals that request inserts according to the distance of terminal apart from the base station in the base station, makes terminal up Timing Advance separately more accurate.In the practical application, if terminal asks to insert in apart from the scope of base station 100km (km), the value of the base station N that judges out should be 16 so; If (greater than the 100km) request in the distance scope of same base station 200km of another terminal inserts, this moment, the value of the N that this base station is judged should be adjusted into 32.Like this, for a base station, can dynamically adjust the value of N apart from the distance of base station, thereby let the different terminals that inserts same base station carry out uplink synchronous with more accurate up Timing Advance separately according to the terminal.

In addition, according to formula NTA=TA * NT _s, systematic sampling time T s is unmodifiable, so except changing the value of N, can also change the span (this moment, the value of N was always 16) that goes up line time adjusted value TA, makes coverage radius of cell under large coverage, also can support.For example, in the LTE system, when coverage radius of cell is in the 100km scope; Regularly line time adjusted value TA on 11 bit representations is used in the adjustment instruction, and the span of TA is [0,1282]; NTA=[0,0.667ms], the covering radius that it is corresponding: R==0.667ms*3*10 ⁸M/s=100km.When coverage radius of cell when 100km is above, regularly the adjustment instruction takies 1 reserved place, uses line time adjusted value TA on 12 bit representations altogether; The span of TA is [0,2564], and NTA=[0; 1.335ms], the covering radius that it is corresponding: R==1.335ms*3*10 ⁸M/s=400km.

But take reserved place and adjust the shortcoming that TA exists and be: base station and terminal all will change corresponding protocol, and be bigger to the change of equipment, dumb, implemented certain degree of difficulty.Therefore, the application preferably supports the communication under the large coverage through the value of adjustment N.

Based on above-mentioned Fig. 4 and Fig. 5 embodiment, through the flow process of Fig. 6 the reciprocal process between terminal and base station is described below.

With reference to Fig. 6, be the flow chart that the said a kind of LTE uplink random of the application embodiment inserts.

Wherein, UE representes the terminal, and eNB is the abbreviation of eNodeB, refers to the base station.

The LTE uplink random inserts the access that comprises initial access and switching when, is example with initial access below, comprises MSG1, MSG2, MSG3 and MSG4 plurality of processes, and is specific as follows:

MSG1, random access leader sequence Preamble is sent at the terminal;

Among the LTE, there are 64 targeting sequencings that insert at random each sub-district, is used to respectively based on the access at random (like initial access) of competition and non-competing access at random (like switching time access).Wherein, the number number of the targeting sequencing that inserts at random that is used to compete is numberofRA-Preambles, in the SIB2 system message, broadcasts.The targeting sequencing at random that is used to compete is divided into two groups of GroupA and GroupB again.Wherein the number of GroupA is decided by parameter p reamblesGroupA, if the number of the number of GroupA and the sum of the targeting sequencing at random that is used to compete is equal, just means that GroupB does not exist.

The main distinction of GroupA and GroupB be will be in MSG3 the size of information transmitted, essageSizeGroupA representes by parameter m.Under the situation that GroupB exists, if the length of the information transmitted of wanting (adding the MAC head, MAC Control Element etc.) greater than messageSizeGroupA, and UE can satisfy under the condition of transmitting power, UE will select the targeting sequencing among the GroupB.

UE can implicitly notify the eNodeB size of its MSG3 that will transmit through selecting the targeting sequencing of GroupA or GroupB the inside.ENodeB can distribute corresponding ascending resource in view of the above, thereby has avoided the wasting of resources.

After UE sends Preamble; Need to wait for the accidental access response of network side; If the response of in the given time (the parameter ra-ResponseWindowSize according to the high level configuration judges), correctly not receiving network side; Then in the Preamble maximum number of times of transmission (the parameter p reambleTransMax by the high level configuration confirms) of configuration, UE can repeat to send Preamble.

MSG2 after the base station receives Preamble, confirms to go up the value of line time adjusted value TA and adjustment factor N, and returns accidental access response RAR to the terminal;

Accidental access response (RAR), it is produced by the MAC layer of eNB, sends to physical layer through accidental access response MAC PDU, is carried by DL-SCH (descending transmission channel).When eNB detects the targeting sequencing that UE sends, will on DL-SCH, send a response.

An accidental access response MAC PDU can comprise the accidental access response of a plurality of UE; RAR MAC PDU to each UE; Main contents comprise: the call number of detected targeting sequencing, the time adjustment information that is used for uplink synchronous, initial ascending resource distribute (being used to send MSG3 subsequently); And an interim C-RNTI, whether this interim C-RNTI will decision convert permanent C-RNTI in step 4 (conflict solves).

UE need use RA-RNTI (Random Access RNTI) to monitor RAR message on PDCCH.

The message content of MSG2 is as shown in table 1 below:

The message content of table 1MSG2

In the table 1, the TA of 11 bits is last line time adjusted value, and span is [0,1282], and the CQI request of 1 bit is adjustment factor indication information during as reserved place.

The base station can calculate the uplink time delay after detecting random access leader sequence Preamble, and determines the last line time adjusted value TA at terminal according to said uplink time delay; Then, judge: if time delay smaller or equal to 0.667ms, indicating terminal is according to NTA=TA * 16T so _sCalculate up Timing Advance, if greater than 0.667ms, indicating terminal calculates up Timing Advance according to NTA=TA * 32Ts.

MSG3 after the terminal receives the accidental access response of base station feedback, calculates up Timing Advance, and sends MSG3 according to said up Timing Advance;

So-called MSG3 is exactly the 3rd message in fact, because in the process that inserts at random, the content of these message is unfixing, and what sometimes possibly carry is the RRC connection request, sometimes may be with some control messages even business data packet, therefore abbreviates MSG3 as

After UE receives the accidental access response of eNB feedback, earlier according to NTA=TA * NT _sCalculate up Timing Advance, wherein the value of N can obtain according to accidental access response.Then, according to scheduling grant, on UL-SCH, send MSG3 according to said up Timing Advance.MSG3 adopts HARQ, and number of retransmissions can be disposed by RRC.The message content of the last carrying of MSG3 is different and different, specifically as shown in table 2 according to inserting reason:

Table 2MSG3 carries content

UE receives RAR message, obtains up time synchronized and ascending resource.But can not confirm that RAR message is the UE that sends to UE oneself rather than send to other this moment.Because targeting sequencing picked at random from public resource of UE; Therefore; Exist different UE sends identical access lead sequence on identical time-frequency resources possibility, like this, they will receive same RAR through identical RA-RNTI.And UE also is unable to find out the UE whether other are arranged and is using identical resource to insert at random.UE need solve such access interference at random through MSG3 and MSG4 message subsequently for this reason.

MSG3 is that article one is based on uplink scheduling; Through HARQ (Hybrid Automatic Repeat request; Mix automatic repeat requests); Go up the message of transmission at PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel), its maximum retransmission is defined by maxHARQ-Msg3TX.In initial access at random, that transmit among the MSG3 is RRCConnectionRequest.If different UE receives identical RAR message, they will obtain identical ascending resource so, send MSG3 message simultaneously.In order to distinguish different UE, in MSG3, can carry a UE specific I D, be used to distinguish different UE.Under initial situation about inserting, this ID can be the S-TMSI (if existence) of UE or one 40 the value (can think that the possibility that different UEs generates 40 identical place values at random is very little) that generates at random.

UE will start conflict at once and solve timer mac-ContentionResolutionTimer (and subsequently resend messages 3 will restart this timer) each time after distributing MSG3 message, monitor eNodeB between UE needs at this moment to return to own conflict solution message.

MSG4, conflict solves.

If at mac-ContentionResolutionTimer in the time; UE receives the ContentionResolution message that eNodeB returns; And the UE ID that wherein carries reports conforming to of eNodeB with own in MSG3; UE just thinks and the access interference at random that oneself has won this inserts successfully at random so, and the interim C-RNTI that will in RAR message, obtain is changed to the C-RNTI of oneself.

Otherwise UE thinks this access failure, and the retransmission processes that inserts at random according to rule recited above.

It should be noted that conflict solves message MSG4, also is based on HARQ's.The UE that only wins conflict just sends the ACK value, loses maybe can't the decode UE of MSG4 of conflict and does not send any feedback message.

Can find out through above-mentioned Fig. 6 embodiment; The base station needs to calculate the uplink time delay, and judges that whether this time delay is smaller or equal to 0.667ms after receiving the access lead sequence at terminal; If; N value 16 in the calculating of the up Timing Advance of indicating terminal then, if greater than 0.667ms, then the N value 32.

Based on above content, the application is according to practical situations, also provide a kind of more simply, more practical implementation, to solve the large coverage problem of communication down, specifically shown in Fig. 7 embodiment.

With reference to Fig. 7, be the up Timing Advance control method flow chart under the large coverage in the said a kind of LTE of another embodiment of the application system.

In the LTE system, under large coverage, in the scene like covering radius 200km:

The handling process of base station is the same with prior art, does not make any change;

The handling process at terminal is following:

Step 701 is sent accidental access signal to the base station;

Step 702 receives the accidental access response that carries line time adjusted value TA from the base station;

Step 703 extracts line time adjusted value TA from said accidental access response;

Step 704 is the product that 32 adjustment factor N multiply by systematic sampling time T s with the acquiescence value, multiply by the said line time adjusted value TA of going up again, obtains up Timing Advance.

In the scene of covering radius 100km, NTA=TA * 16T is adopted at the terminal _sCalculate up Timing Advance; And surpass in the scene of 100km at covering radius, adopt new relational expression NTA=TA * NT _sCalculate, wherein the covering radius expanded as required of N is provided with in advance and plans, such as needs covering radius 200km, N=32 so.

Terminal equipment obtains to go up line time adjusted value TA by the new relation mechanism that is provided with in advance, and terminal equipment sends upstream data according to the up Timing Advance NTA of reality then, guarantees that the terminal signaling of different distance near or farthest in time arrives the base station.

Fig. 7 embodiment can propose effective solution not changing standard, not changing under the situation of system frame structure to the problem that big covering signal post of the system that influences produces.

More than each embodiment be to be that example describes with the LTE system, but also can be applied in other GSMs such as GSM or TD-SCDMA in concrete the application, it is similar to the aforementioned embodiment that it implements principle, so repeat no more.

Need to prove; For aforesaid method embodiment, for simple description, so it all is expressed as a series of combination of actions; But those skilled in the art should know; The application does not receive the restriction of described sequence of movement, because according to the application, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action might not be that the application is necessary.

Based on the explanation of said method embodiment, the application also provides the base station and the terminal embodiment of the up Timing Advance of may command, describes through Fig. 8 to Figure 10 respectively below.

With reference to Fig. 8, be the said a kind of architecture of base station figure that controls up Timing Advance of the application embodiment.

Said base station can comprise with lower module:

Detection module 81 is used to detect the accidental access signal of self terminal;

Computing module 82 is used for calculating the uplink time delay according to said accidental access signal, and calculates the last line time adjusted value at terminal;

Determination module 83 is used for confirming the time delay scope under the said uplink time delay, and confirms the adjustment factor/adjustment factor indication information that should the time delay scope;

Response sending module 84; Be used for carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information and send to the terminal, the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably, said determination module 83 specifically can comprise following submodule:

Decision sub-module is used to judge that whether said uplink time delay is smaller or equal to predetermined threshold value;

Matched sub-block, if be used for smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

Wherein, the N1 of the expression adjustment factor is natural number less than N2; The N1 and the N2 of expression adjustment factor indication information are 0 or 1.

Preferably, in the LTE system, when said predetermined threshold value was 0.667 millisecond, the N1 of the expression adjustment factor was 16, and the N2 of the expression adjustment factor is 32.

Preferably, in the LTE system, the said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place; The accidental access response that said response sending module 84 will carry said timing adjustment instruction sends to the terminal.

Preferably, in another embodiment, said determination module 83 specifically can comprise following submodule:

Whether first decision sub-module is used to judge said uplink time delay smaller or equal to first predetermined threshold value, if smaller or equal to said first predetermined threshold value, confirms that then the corresponding adjustment factor/adjustment factor indication information is N1;

Second decision sub-module if be used for greater than said first predetermined threshold value and smaller or equal to second predetermined threshold value, confirms that then the corresponding adjustment factor/adjustment factor indication information is N2;

The 3rd decision sub-module if be used for greater than said second predetermined threshold value, confirms that then the corresponding adjustment factor/adjustment factor indication information is N3;

Wherein, the N1 of the expression adjustment factor is less than N2, and N2 is natural number less than N3.

Preferably, in the LTE system, the span of said upward line time adjusted value is constant to be 0～1282.

For above-mentioned base station embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of Fig. 4 and method embodiment shown in Figure 6.

With reference to Fig. 9, be the said a kind of terminal structure figure that controls up Timing Advance of the application embodiment.

Said terminal can comprise with lower module:

AM access module 91 at random, are used for sending accidental access signal to the base station;

Response receiver module 92 is used to receive the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information from the base station;

Extraction module 93 is used for extracting line time adjusted value and the adjustment factor/adjustment factor indication information from said accidental access response;

Computing module 94 is used for calculating up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

Preferably, in the LTE system, the span of said upward line time adjusted value is constant to be 0～1282; The said adjustment factor is 16 or 32.

Preferably, if carry in the accidental access response be the adjustment factor, then computing module 94 calculates up Timing Advance according to following formula:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

Preferably, if what carry in the accidental access response is adjustment factor indication information, then computing module 94 is confirmed the corresponding adjustment factor according to said adjustment factor indication informations earlier;

Calculate up Timing Advance according to following formula then:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

For above-mentioned terminal embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of Fig. 5 and method embodiment shown in Figure 6.

With reference to Figure 10, be the terminal structure figure of the up Timing Advance of control under the said a kind of large coverage of another embodiment of the application.

Said terminal can comprise with lower module:

AM access module 11 at random, are used for sending accidental access signal to the base station;

Response receiver module 12 is used to receive the accidental access response that carries the line time adjusted value from the base station;

Extraction module 13 is used for extracting the line time adjusted value from said accidental access response;

Computing module 14, being used for the acquiescence value is that 32 the adjustment factor multiply by the product of systematic sampling time, multiply by the said line time adjusted value of going up again, obtains up Timing Advance.

For above-mentioned terminal embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment shown in Figure 7.

The communication system that above-mentioned base station and terminal are formed is through changing the value of adjustment factor N, solved under the large coverage control problem of (in the LTE system greater than 100km scope) up Timing Advance.

And suitable adjustment factor N also can be selected for the different terminals that request inserts according to the distance of terminal apart from the base station in the base station, makes terminal up Timing Advance separately more accurate.

And reserved place transmission adjustment factor indication information is used in the base station, does not change the communication protocol of base station and terminal room, does not also change frame structure, more need not to change terminal equipment, realizes simple.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.

More than to the control method of a kind of up Timing Advance that the application provided and base station, terminal; Carried out detailed introduction; Used concrete example among this paper the application's principle and execution mode are set forth, the explanation of above embodiment just is used to help to understand the application's method and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to the application's thought, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the application.

Claims (17)

1. the control method of a up Timing Advance is characterized in that, comprising:

Detect the accidental access signal of self terminal;

Calculate the uplink time delay according to said accidental access signal, and calculate the last line time adjusted value at terminal;

Confirm the time delay scope under the said uplink time delay, and confirm the adjustment factor/adjustment factor indication information that should the time delay scope;

Send to the terminal with carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information, the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

2. method according to claim 1 is characterized in that, the said time delay scope of confirming under the said uplink time delay, and confirm the adjustment factor/adjustment factor indication information that should the time delay scope is comprised:

Whether judge said uplink time delay smaller or equal to predetermined threshold value, if smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

Wherein, the N1 of the expression adjustment factor is natural number less than N2; The N1 and the N2 of expression adjustment factor indication information are 0 or 1.

3. method according to claim 2 is characterized in that:

In the LTE system, when said predetermined threshold value was 0.667 millisecond, the N1 of the expression adjustment factor was 16, and the N2 of the expression adjustment factor is 32.

4. method according to claim 2 is characterized in that, the said accidental access response that will carry said upward line time adjusted value and adjustment factor indication information sends to the terminal, comprising:

In the LTE system, the said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein to go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place;

The accidental access response that carries said timing adjustment instruction is sent to the terminal.

5. method according to claim 1 is characterized in that, the said time delay scope of confirming under the said uplink time delay, and confirm the adjustment factor/adjustment factor indication information that should the time delay scope is comprised:

Whether judge said uplink time delay smaller or equal to first predetermined threshold value,, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1 if smaller or equal to said first predetermined threshold value;

If greater than said first predetermined threshold value and smaller or equal to second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

If greater than said second predetermined threshold value, confirm that then the corresponding adjustment factor/adjustment factor indication information is N3;

Wherein, the N1 of the expression adjustment factor is less than N2, and N2 is natural number less than N3.

6. method according to claim 1 is characterized in that:

In the LTE system, the span of said upward line time adjusted value is constant to be 0～1282.

7. the control method of a up Timing Advance is characterized in that, comprising:

Send accidental access signal to the base station;

Reception is from the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information of base station;

From said accidental access response, extract line time adjusted value and the adjustment factor/adjustment factor indication information;

Calculate up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

8. method according to claim 7 is characterized in that, said line time adjusted value and the up Timing Advance of adjustment factor calculation gone up of said foundation comprises:

Calculate up Timing Advance according to following formula:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

9. method according to claim 7 is characterized in that, the said line time adjusted value of going up of said foundation calculates up Timing Advance with adjustment factor indication information, comprising:

Confirm the corresponding adjustment factor according to said adjustment factor indication information;

Calculate up Timing Advance according to following formula:

NTA＝TA×NT _s；

Wherein, NTA representes up Timing Advance, and TA representes the line time adjusted value, and N representes to adjust the factor, and Ts representes the systematic sampling time.

10. method according to claim 7 is characterized in that:

In the LTE system, the span of said upward line time adjusted value is constant to be 0～1282;

The said adjustment factor is 16 or 32.

11. the up Timing Advance control method under the large coverage is characterized in that, comprising:

Send accidental access signal to the base station;

Reception is from the accidental access response that carries the line time adjusted value of base station;

From said accidental access response, extract the line time adjusted value;

With the acquiescence value is that 32 the adjustment factor multiply by the product of systematic sampling time, multiply by the said line time adjusted value of going up again, obtains up Timing Advance.

12. the base station of the up Timing Advance of control is characterized in that, comprising:

Detection module is used to detect the accidental access signal of self terminal;

Computing module is used for calculating the uplink time delay according to said accidental access signal, and calculates the last line time adjusted value at terminal;

Determination module is used for confirming the time delay scope under the said uplink time delay, and confirms the adjustment factor/adjustment factor indication information that should the time delay scope;

The response sending module; Be used for carrying the said accidental access response of going up line time adjusted value and the adjustment factor/adjustment factor indication information and send to the terminal, the terminal is calculated up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

13. base station according to claim 12 is characterized in that, said determination module comprises:

Decision sub-module is used to judge that whether said uplink time delay is smaller or equal to predetermined threshold value;

Matched sub-block, if be used for smaller or equal to, confirm that then the corresponding adjustment factor/adjustment factor indication information is N1; If greater than, confirm that then the corresponding adjustment factor/adjustment factor indication information is N2;

Wherein, the N1 of the expression adjustment factor is natural number less than N2; The N1 and the N2 of expression adjustment factor indication information are 0 or 1.

14. base station according to claim 12 is characterized in that:

In the LTE system, the said line time adjusted value of going up is adjusted the instruction expression with adjustment factor indication information with 12 timing, wherein to go up the line time adjusted value and account for 11, adjustment factor indication information accounts for remaining 1 reserved place;

The accidental access response that said response sending module will carry said timing adjustment instruction sends to the terminal.

15. the terminal of the up Timing Advance of control is characterized in that, comprising:

AM access module at random is used for sending accidental access signal to the base station;

The response receiver module is used to receive the accidental access response that carries line time adjusted value and the adjustment factor/adjustment factor indication information from the base station;

Extraction module is used for extracting line time adjusted value and the adjustment factor/adjustment factor indication information from said accidental access response;

Computing module is used for calculating up Timing Advance according to the said line time adjusted value of going up with the adjustment factor/adjustment factor indication information.

16. terminal according to claim 16 is characterized in that:

In the LTE system, the span of said upward line time adjusted value is constant to be 0～1282;

The said adjustment factor is 16 or 32.

17. a large coverage is controlled the terminal of up Timing Advance down, it is characterized in that, comprising:

AM access module at random is used for sending accidental access signal to the base station;

The response receiver module is used to receive the accidental access response that carries the line time adjusted value from the base station;

Extraction module is used for extracting the line time adjusted value from said accidental access response;

Computing module, being used for the acquiescence value is that 32 the adjustment factor multiply by the product of systematic sampling time, multiply by the said line time adjusted value of going up again, obtains up Timing Advance.

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