CN102647781A - Method for TA (Time Advance) regulation of LTE (Long Term Evolution) and base station - Google Patents

Abstract

The invention relates to a method for TA (Time Advance) regulation of LTE (Long Term Evolution) and a base station. The method comprises the following steps of: starting a TA timer by the base station; measuring and recording time offset instantaneous value of a target UE (User Equipment) by the base station; saving L newest time offset instantaneous values by the base station and using the average value of the L newest time offset instantaneous values as an effective time offset value; and issuing a TA regulating command by the base station according to the effective time offset value before the timeout of the TA timer and restarting the TA timer. According to the method for the TA regulation of the LTE and the base station, disclosed by the invention, the accuracy and the efficiency for the TA regulation can be increased.

Description

The time of LTE shifts to an earlier date method of adjustment and base station

Technical field

The present invention relates to wireless communication technology field, specifically is that the time of LTE shifts to an earlier date method of adjustment and base station.

Background technology

LTE (Long Term Evolution; Long Term Evolution) in the system, (Time Advance TA) is one and is used to characterize eNodeB (evolved NodeB Timing Advance; Evolution base station) receives the parameter of the timing offset of UE (UserEquipment, the subscriber equipment) data of sending.In order to keep uplink synchronous; ENodeB indication UE sends DMRS (Demodulation reference signal at official hour point; Uplink demodulation reference signal) or SRS (sounding reference signal, detection reference signal), through regularly measuring TA; ENodeB will adjust order the time in advance through Physical Downlink Shared Channel and be handed down to UE and adjust, to keep the uplink synchronous of UE and eNodeB.

Among the LTE, it is with respect to current up timing that the time is adjusted order in advance, representes with the multiple of 16 times of Ts (1Ts is the basic time unit of LTE), and issues through MAC (Medium/Media AccessControl, medium access control) control unit.The time of having carried 6 bits in the time adjustment MAC Control Element is adjusted order T in advance _A, be used for indication with respect to current absolute adjustment amount N _{TA, old}Relative adjustment amount, span is T _A=0,1 ..., 63, so new absolute adjustment amount is expressed as N _{TA, new}=N _{TA, old}+ (T _A-31) * 16, unit is Ts.

In the prior art, generally be the instantaneous TA value of base station, perhaps smoothly obtain smooth value, notify UE to carry out the adjustment of TA then based on instantaneous value according to measurement.Prior art is when up signal to noise ratio is higher, and problem is little, but under low signal-to-noise ratio; Owing to the instantaneous value of measuring receives the influence of noise and interference to become inaccurate easily; Even the result that adjacent moment TA measures fluctuates on a large scale, thus the adjustment that shifts to an earlier date based on the prior art time of carrying out, in the time of can making the up reception signal of base station processes; The information that has comprised adjacent-symbol within the window of its Fourier transform (FFT); Disturb between created symbol (ISI), thereby greatly worsen the performance that uplink demodulation is examined signal, make throughput of system descend.

Summary of the invention

Main purpose of the present invention provides time adjusting method and the base station of a kind of LTE, precision and the efficient adjusted in advance with the raising time.

The technical solution adopted for the present invention to solve the technical problems is:

The time of a kind of LTE shifts to an earlier date method of adjustment, and it comprises:

Base station initiated TA timer;

The time inclined to one side instantaneous value of base station measurement and record object subscriber equipment;

Inclined to one side instantaneous value when the base station is preserved up-to-date L is worth its mean value when effective partially;

The base station was adjusted order in advance according to said when effective, and is restarted the TA timer before the TA timer expiry time that issues phase on weekly duty partially.

Preferably, the condition of said startup TA timer is: subscriber equipment is accomplished random access procedure, and perhaps the base station is accomplished and issued regularly adjustment order in advance.

Preferably, the time inclined to one side instantaneous value of base station measurement and record object subscriber equipment specifically comprises:

Obtain inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by; Perhaps, estimate that according to uplink demodulation reference signal or detection reference signal the due in of channel article one footpath or most powerful path obtains inclined to one side instantaneous value when said.

Preferably, order was adjusted according to said when effective the time that issues phase on weekly duty partially in advance in said base station before the TA timer expiry, specifically comprise:

Before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Target, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.

The present invention also provides a kind of base station, comprising:

The timer start unit is used to start the TA timer;

The surveying record unit is used to measure the also time inclined to one side instantaneous value of record object subscriber equipment;

Calculation processing unit, inclined to one side instantaneous value when being used to preserve up-to-date L is worth its mean value as effectively the time partially;

Adjustment order issues the unit, is used for before the TA timer expiry, the time that issues phase on weekly duty partially adjusts order in advance according to said when effective, and restarts the TA timer.

Preferably, said timer start unit is used for accomplishing random access procedure at subscriber equipment, and perhaps the base station is accomplished under the condition that issues regularly adjustment order in advance and started the TA timer.

Preferably; Said surveying record unit; Be used for obtaining inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by; Perhaps, estimate that according to uplink demodulation reference signal or detection reference signal the due in of channel article one footpath or most powerful path obtains inclined to one side instantaneous value when said.

Preferably, said adjustment order issues the unit, also be used for before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Target, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.

The technical scheme of embodiment of the present invention; Has following beneficial effect: the time adjusting method of LTE provided by the invention and base station; Adopt current up-to-date be worth partially when the mean value of inclined to one side instantaneous value is as target UE effective when a plurality of; Confirm to adjust order in advance to the target UE time that issues, the precision of measuring partially in the time of can improving, avoid since the time partially measurement receive the time that measurement that noise and interference effect cause forbidden to cause and adjust inaccurate in advance; Even cause the problem of uplink loss, the precision that the time under the low signal-to-noise ratio of particularly having improved is greatly adjusted in advance; Choose inclined to one side instantaneous value when a plurality of flexibly, can be when guaranteeing precision, the implementation complexity that the time that greatly reduces is adjusted in advance; Reliability for discontinuous dispatching and the time of even reading the situation of dispatching are adjusted in advance can both achieve a solution and improve.Adjustment precision and efficient that the time of having improved greatly shifts to an earlier date, thus throughput of system finally improved.

Description of drawings

The method flow diagram that Fig. 1 provides for the embodiment of the invention;

The structural representation of the base station that Fig. 2 provides for the embodiment of the invention.

The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.

Embodiment

In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

The embodiment of the invention provides the time of a kind of LTE to shift to an earlier date method of adjustment, and the step of this method is implemented through the base station, and as shown in Figure 1, the method comprising the steps of:

S110, base station initiated TA timer; In other embodiment, further, the condition of said startup TA timer is: subscriber equipment is accomplished random access procedure, and perhaps the base station is accomplished and issued regularly adjustment order in advance.

The time inclined to one side instantaneous value of S120, base station measurement and record object subscriber equipment; In other embodiment, further, this step S120 specifically comprises:

Obtain inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by; Perhaps, estimate that according to uplink demodulation reference signal or detection reference signal (this most powerful path is: due in prominent footpath) obtains inclined to one side instantaneous value when said for channel article one footpath or most powerful path.

Inclined to one side instantaneous value when S130, base station preserve up-to-date L is worth its mean value when effective partially;

Wherein, the choosing of inclined to one side instantaneous value in the time of L can combine signal to noise ratio to choose or be taken as fixed value.If select in conjunction with signal to noise ratio, when then signal to noise ratio was low, the L value was bigger; When signal to noise ratio was higher, the L value was less.

S140, base station were adjusted order in advance according to said when effective, and are restarted the TA timer before the TA timer expiry time that issues phase on weekly duty partially.Repeating step S120～S140 can carry out next time and shift to an earlier date the adjustment process of adjustment cycle.

In other embodiment, further, this step S140 specifically comprises:

Before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Target, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.

The time adjusting method of the LTE that the embodiment of the invention provides; Adopt current up-to-date be worth partially when the mean value of inclined to one side instantaneous value is as target UE effective when a plurality of; Confirm to adjust order in advance to the target UE time that issues; The precision of measuring partially in the time of can improving; Avoid owing to the time partially measure and receive time that measurement that noise and interference effect cause forbidden to cause and adjust inaccurately in advance, even cause the problem of uplink loss, the precision that the time under the low signal-to-noise ratio of particularly having improved is greatly adjusted in advance; Choose inclined to one side instantaneous value when a plurality of flexibly, can be when guaranteeing precision, the implementation complexity that the time that greatly reduces is adjusted in advance; Reliability for discontinuous dispatching and the time of even reading the situation of dispatching are adjusted in advance can both achieve a solution and improve.Adjustment precision and efficient that the time of having improved greatly shifts to an earlier date, thus throughput of system finally improved.

The embodiment of the invention also provides a kind of base station, and is as shown in Figure 2, and this base station comprises:

Timer start unit 210 is used to start the TA timer; Among other the embodiment, more specifically, said timer start unit 210 is used for accomplishing random access procedure at subscriber equipment, and perhaps the base station is accomplished under the condition that issues regularly adjustment order in advance and started the TA timer.

Surveying record unit 220 is used to measure the also time inclined to one side instantaneous value of record object subscriber equipment; Among other the embodiment; More specifically; Said surveying record unit 220; Be used for obtaining inclined to one side instantaneous value when said, perhaps, estimate that according to uplink demodulation reference signal or detection reference signal the due in of channel article one footpath or most powerful path obtains inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by.

Calculation processing unit 230, inclined to one side instantaneous value when being used to preserve up-to-date L is worth its mean value as effectively the time partially;

Adjustment order issues unit 240, is used for before the TA timer expiry, the time that issues phase on weekly duty partially adjusts order in advance according to said when effective, and restarts the TA timer.

Among other the embodiment, more specifically, said adjustment order issues unit 240, also be used for before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Target, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.

The base station that the embodiment of the invention provides; Adopt current up-to-date be worth partially when the mean value of inclined to one side instantaneous value is as target UE effective when a plurality of; Confirm to adjust order in advance to the target UE time that issues, the precision of measuring partially in the time of can improving, avoid since the time partially measurement receive the time that measurement that noise and interference effect cause forbidden to cause and adjust inaccurate in advance; Even cause the problem of uplink loss, the precision that the time under the low signal-to-noise ratio of particularly having improved is greatly adjusted in advance; Choose inclined to one side instantaneous value when a plurality of flexibly, can be when guaranteeing precision, the implementation complexity that the time that greatly reduces is adjusted in advance; Reliability for discontinuous dispatching and the time of even reading the situation of dispatching are adjusted in advance can both achieve a solution and improve.Adjustment precision and efficient that the time of having improved greatly shifts to an earlier date, thus throughput of system finally improved.

More than be merely preferred embodiment of the present invention,, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.

Claims (8)

1. the time of a LTE shifts to an earlier date method of adjustment, it is characterized in that, comprising:

Base station initiated Timing Advance TA timer;

The time inclined to one side instantaneous value of base station measurement and record object subscriber equipment;

Inclined to one side instantaneous value when the base station is preserved up-to-date L is worth its mean value when effective partially;

The base station was adjusted order in advance according to said when effective, and is restarted the TA timer before the TA timer expiry time that issues phase on weekly duty partially.

2. method according to claim 1 is characterized in that, the condition of said startup TA timer is: subscriber equipment is accomplished random access procedure, and perhaps the base station is accomplished and issued regularly adjustment order in advance.

3. method according to claim 1 is characterized in that the time inclined to one side instantaneous value of base station measurement and record object subscriber equipment specifically comprises:

Obtain inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by; Perhaps, estimate that according to uplink demodulation reference signal or detection reference signal the due in of channel article one footpath or most powerful path obtains inclined to one side instantaneous value when said.

4. method according to claim 1 is characterized in that, order was adjusted according to said when effective the time that issues phase on weekly duty partially in advance in said base station before the TA timer expiry, specifically comprise:

Before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Tgrget, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.

5. a base station is characterized in that, comprising:

The timer start unit is used to start the TA timer;

The surveying record unit is used to measure the also time inclined to one side instantaneous value of record object subscriber equipment;

Calculation processing unit, inclined to one side instantaneous value when being used to preserve up-to-date L is worth its mean value as effectively the time partially;

Adjustment order issues the unit, is used for before the TA timer expiry, the time that issues phase on weekly duty partially adjusts order in advance according to said when effective, and restarts the TA timer.

6. like the said base station of claim 5, it is characterized in that said timer start unit is used for accomplishing random access procedure at subscriber equipment, perhaps the base station is accomplished under the condition that issues regularly adjustment order in advance and is started the TA timer.

7. like the said base station of claim 5; It is characterized in that; Said surveying record unit; Be used for obtaining inclined to one side instantaneous value when said, perhaps, estimate that according to uplink demodulation reference signal or detection reference signal the due in of channel article one footpath or most powerful path obtains inclined to one side instantaneous value when said according to the adjacent of uplink demodulation reference signal or detection reference signal or the channel response phase difference calculating between subcarrier of being separated by.

8. like the said base station of claim 5, it is characterized in that said adjustment order issues the unit, also be used for before the TA timer expiry, according to calculate effective the time value TA partially _EffWith TA desired value TA _Target, generation time is adjusted order TAC in advance, wherein, when effective, is worth TA partially _EffDeduct TA desired value TA _TargetGreater than 8 o'clock, then to adjust order TAC in advance be 32 the time; When effective, be worth TA partially _EffDeduct TA desired value TA _TargetLess than-8 o'clock, then to adjust order TAC in advance be 30 the time; When partially value was for other situation when effective, then to adjust order TAC in advance be 31 the time; Perhaps adjust order TAC in advance according to the formula generation time, this formula is:

$\mathrm{TAC}=\mathrm{round}\left(\frac{{\mathrm{TA}}_{\mathrm{eff}}-{\mathrm{TA}}_{t\arg \mathrm{et}}}{16}\right)+31$

Wherein, round () representes to round up computing.