CN102098703A - Method and device for determining terminal measurement frequency in cell handover - Google Patents

Abstract

The invention discloses a method and a device for determining a terminal measurement frequency in a cell handover, relates to the technical field of radio communication, and provides a scheme for optimizing the terminal measurement frequency, which can reduce the measurement frequency of the terminal as much as possible on the premise of ensuring the success rate of the cell handover. The method provided by the embodiment of the invention comprises acquiring a first distance from the terminal to an evolved node base (eNB) of a service cell when the terminal moves from the service cell to a target cell and when the terminal is in accordance with handover conditions for the first time; and acquiring a critical distance from the terminal to the eNB of the service cell; calculating to obtain a handover effective distance by using the difference between the critical distance and the first distance; and determining the measurement frequency of the terminal according to the handover effective distance.

Description

During switching, the sub-district determines the method and apparatus of terminal measuring frequency

Technical field

The present invention relates to the wireless communication technique field, especially relate to the method and apparatus of determining the terminal measuring frequency in the switching of a kind of sub-district.

Background technology

Long Term Evolution (Long Term Evolution, LTE) network is a kind of wireless network of flattening, UMTS Terrestrial radio access network network (Evolved UMTSTerrestrial Radio Access Network by evolution, the base station of the evolution E-UTRAN) (evolved Node Base, eNB) and the evolution packet switching center (Evolved PacketCore EPC) forms.

(Mobility Management Entity MME) can connect a plurality of eNB to a Mobility Management Entity among the LTE.(User Equipment's subscriber equipment UE) can move around between a plurality of eNB, the mobility of UE among Here it is the LTE.Mobility is very important characteristic in the LTE system, and UE can realize mobility by the sub-district gravity treatment under switching of the sub-district under the connection status and the idle condition.

When UE from current area when Target cell switches, UE need measure the power of detected sub-district, the UE measurement is a conclusive process, and the measurement that holds water not only can reduce the probability of handoff failure, and the performance of UE is also had greatly improved.UE reports the eNB of Serving cell with measured value by measurement report, and has only this measured value when reporting of regulation satisfied the measurement report condition in the time interval always, and UE just can send measurement report to eNB.ENB sends switching command according to the measurement report that receives to UE, so that UE switches to corresponding Target cell from current area.

In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:

Existing scheme is not to carrying out any regulation in the measuring frequency that reports UE in the time interval of regulation, and each manufacturer terminal uses different measuring frequencies according to the difference of UE performance fully.The measuring frequency height that the UE that performance is good uses, measurement is frequent, and measured value is accurately level and smooth relatively, however the effect of monitoring is all just played in most of measurement concerning UE, and measuring too frequently is that finite wireless resources is too wasted in power consumption again; The measuring frequency that the UE of poor performance uses is just lower, and measured value is not accurate especially.

And UE is the switching that realizes in network between the sub-district, and the manufacturer terminal this method that measuring frequency is set based on the UE performance fully, not realistic situation can't obtain a rational measuring frequency.The measuring frequency that how to reduce UE under the situation that guarantees the sub-district handover success rate has as much as possible become one of focus of current research.

Summary of the invention

The embodiment of the invention provides the method and apparatus of determining the terminal measuring frequency in the switching of a kind of sub-district, and a kind of scheme of optimizing the terminal measuring frequency is provided, and can reduce the measuring frequency of terminal under the situation that guarantees the sub-district handover success rate as much as possible.

For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that

The embodiment of the invention provides the method for determining the terminal measuring frequency in the switching of a kind of sub-district, comprising:

When terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, first distance of the base station eNB of distance service sub-district evolution; And,

Obtain the critical distance of terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

Utilize the difference of the described critical distance and first distance to calculate the switching coverage;

Determine the measuring frequency of terminal according to described switching coverage.

The embodiment of the invention also provides the device of determining the terminal measuring frequency in the switching of a kind of sub-district, comprising:

First distance acquiring unit, be used for when terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, first distance of distance service sub-district eNB;

The critical distance acquiring unit, be used to obtain the critical distance of terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

Switch the coverage computing unit, be used to utilize the difference of the described critical distance and first distance to calculate the switching coverage;

The measuring frequency determining unit is used for determining according to described switching coverage the measuring frequency of terminal.

As seen by above-mentioned, the embodiment of the invention provides a kind of scheme of definite terminal measuring frequency by analysing in depth the characteristics of terminal sub-district switching flow, has optimized the measuring frequency of terminal.The technical program has taken into full account the influence of network side to the terminal measuring frequency in conjunction with the handoff scenario of reality, based on terminal path loss for network side in switch the sub-district, pairing switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency, reached the technique effect that under the situation that guarantees the sub-district handover success rate, reduces the measuring frequency of terminal as much as possible for terminal.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

During switching, a kind of sub-district that Fig. 1 provides for the embodiment of the invention one determines the method flow schematic diagram of terminal measuring frequency;

UE measured schematic flow sheet during switched the sub-district that Fig. 2 provides for the embodiment of the invention;

During switching, the sub-district that Fig. 3 provides for the embodiment of the invention two determines the method principle schematic of terminal measuring frequency;

During switching, a kind of sub-district that Fig. 4 provides for the embodiment of the invention three determines the apparatus structure schematic diagram of terminal measuring frequency.

Embodiment

Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope of protection of the invention.

The embodiment of the invention one provides the method for determining the terminal measuring frequency in the switching of a kind of sub-district, and referring to Fig. 1, described method comprises:

11: when terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, the base station of distance service sub-district evolution (evolved Node Base, first distance eNB); And,

12: the critical distance of obtaining terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

13: utilize the difference of the described critical distance and first distance to calculate the switching coverage;

14: the measuring frequency of determining terminal according to described switching coverage.

Above-mentioned terminal can for subscriber equipment (User Equipment, UE), the distance of the above-mentioned first distance expression UE distance service center of housing estate (perhaps signal emitting-source), at this, the distance of getting UE distance service sub-district eNB is as first distance.

As seen by above-mentioned, the embodiment of the invention provides a kind of scheme of definite terminal measuring frequency by analysing in depth the characteristics of terminal sub-district switching flow, has optimized the measuring frequency of terminal.The technical program has taken into full account the influence of network side to the terminal measuring frequency in conjunction with the handoff scenario of reality, based on terminal path loss for network side in switch the sub-district, pairing switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency, reached the technique effect that under the situation that guarantees the sub-district handover success rate, reduces the measuring frequency of terminal as much as possible for terminal.

For the technical scheme of various embodiments of the present invention clearly is described, below some the corresponding technology features in the handoff scenario of sub-district are described.Referring to Fig. 2, comprise the steps:

21:eNB sends Radio Resource control to UE, and (Radio Resource Control, RRC) line is reset (Connection-Reconfiguration) message.

ENB resets message by above-mentioned RRC line and measures the relevant parameter of control to terminal configuration, comprises the measurement Control Parameter of the A3 incident of the 3rd layer (L3) in these parameters.

22:UE is passed to ground floor (L1) with the part correlation parameter of L3.

Because L1 can't directly resolve the parameter of L3, so be passed to L1 after needing UE that the parameter of the L3 such as measurement Control Parameter of A3 incident is resolved.

23:UE measures the power of detected sub-district in the cell switch process, obtains measured value.

Because the complexity of practical radio communication environment, bigger fluctuation may take place to the measurement of sub-district in UE, in this case, if measured value is not smoothly converted and may impact normal switching, so need realize the level and smooth of measured value by filtering.

24:UE filters measured value at L1.

25:UE filters measured value at L3.

A kind of mode of above-mentioned filter operation can be calculated for utilizing former measured value and the measured value that obtains recently to carry out arithmetic average.

26: when measured value the reporting when all satisfying report condition in the time interval of regulation, UE sends measurement report (MeasurementReport) to eNB, will report eNB through the measured value after the smoothing processing.

27:eNB initiates the switching of UE to Target cell according to measurement report.

Determine that the method for terminal measuring frequency is specifically described during switch the sub-district that the embodiment of the invention two is provided below.Referring to Fig. 3, be that example is described with the UE scene that (CELL) 1 moves to sub-district 2 from the sub-district.Fig. 3 is a kind of schematic diagram of simplification, wherein, the coverage of representing sub-district 1 and sub-district 2 with two circles with same radius L respectively, distance between the eNB 1 of sub-district 1 and the eNB2 of sub-district 2 is d, and the lap among Fig. 3 between two circles is represented the common zone that covers between sub-district 1 and the sub-district 2.The dotted line that has arrow among Fig. 3 is represented the movement locus of UE.Specifically comprise following processing:

11: when UE from Serving cell (as sub-district 1) when Target cell (as sub-district 2) is mobile, when obtaining UE first fit switching condition, first distance of the base station eNB of distance service sub-district evolution.

In embodiments of the present invention, adopted a kind of method from the UE measuring frequency to the measurement side-play amount of UE configuration that utilize path loss and eNB to optimize, at this, above-mentioned switching condition be the difference of signal power value of the Serving cell that receives of signal power value and the UE of the Target cell that receives of UE more than or equal to predetermined threshold, described predetermined threshold is that service cell eNB is to the A3 of UE configuration measurement deviant O _FfAt this moment, step 11 can be specially: the difference of the signal power value of the Serving cell that the signal power value of the Target cell that receives as UE and UE receive is during first more than or equal to described A3 measurement deviant, and UE obtains first distance of distance service sub-district eNB.

The signal power of the sub-district that UE receives is from factor decisions such as the receiving antenna gain of the transmitter antenna gain (dBi) of the distance of eNB, eNB, UE and operation wavelengths by the transmission signal power of eNB, UE, for example, when UE when the distance of eNB is r, the received signal power of UE can be expressed as formula:

$P_r={\left(\frac{\mathrm{\λ}}{4\mathrm{\πr}}\right)}^2{P}_0{G}_1{G}_2---\left(1\right)$

Wherein, P _rThe signal power value of the sub-district that expression UE receives, r represents the distance of UE apart from sub-district eNB, λ represents eNB and the employed operation wavelength of UE, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression UE.

In the application scenarios of reality, because the complexity of wireless environment, actual received signal power also may be not exclusively by parameters such as distance, antenna gain and the operation wavelength decision of above-mentioned UE from the base station, for example, local geographical environment has also caused bigger influence to the signal power value, at this moment, can carry out suitable adjustment according to real situation.

Calculate the signal power value of the Serving cell that UE receives and the signal power value of the Target cell that UE receives by following formula (2) and (3), and judge whether to satisfy switching condition according to this signal power value.When satisfying switching condition, calculate the distance of UE distance service sub-district eNB1, because the position of eNB is fixed, so UE can be by the own distance from eNB of known information acquisition, for example, UE can pass through global positioning system, and (Global Positioning System GPS) obtains the positional information of self, thereby calculates above-mentioned first distance; Perhaps, UE utilizes the distance measurement function of configuration on it to obtain above-mentioned first distance according to the wireless signal of receiving and dispatching between itself and the eNB1.

According to foregoing, then there is following formula:

$P_{r1}={\left(\frac{\mathrm{\λ}}{4\mathrm{\π}{x}_1}\right)}^2{P}_0{G}_1{G}_2---\left(2\right)$

$P_{r2}={\left(\frac{\mathrm{\λ}}{4\mathrm{\π}{x}_2}\right)}^2{P}_0{G}_1{G}_2---\left(3\right)$

Wherein, P _R1The signal power value of the sub-district 1 that expression UE receives, x ₁Expression UE is apart from the distance of sub-district 1, P _R2The signal power value of the sub-district 2 that expression UE receives, x ₂Expression UE is apart from the distance of sub-district 2.

The difference of then working as the signal power value of sub-district 1 and sub-district 2 equals A3 and measures deviant O _FfThe time, can access following formula:

$O_{\mathrm{ff}}/2=10\lg \left(\frac{P_{r2}}{P_{r1}}\right)=10\lg {\left(\frac{x_1}{x_2}\right)}^2---\left(4\right)$

Can obtain:

$\frac{x_1}{x_2}={10}^{\frac{O_{\mathrm{ff}}}{40}}---\left(5\right)$

The track of the residing location point of UE in the time of can being obtained to satisfy switching condition for the first time by above-mentioned formula (5) is expressed as the A point with this location point, promptly the A point be UE from Serving cell apart from x ₁With UE from adjacent sub-district apart from x ₂Distance satisfy the point at equation (5) place, at this moment, UE obtain from service cell eNB 1 first apart from x ₁Referring to Fig. 3, some A represent UE from sub-district 1 to the process that move sub-district 2, an example of present location point during the first fit switching condition on a certain specific movement locus.

12: the critical distance of obtaining UE distance service sub-district eNB, described critical distance satisfies following condition: the location point of UE distance service sub-district eNB critical distance is the critical localisation point, UE can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves as UE.

Above-mentioned critical distance is UE maximum distance apart from eNB1 can receive the switching command that service cell eNB 1 issues the time.

Can calculate described critical distance by following formula:

$y=\frac{\mathrm{\λ}}{4\mathrm{\π}{\left(\frac{P_{\min }}{P_0{G}_1{G}_2}\right)}^{\frac{1}{2}}}---\left(6\right)$

Wherein, y represents critical distance, P _MinExpression UE is positioned at the signal power value of the Serving cell of critical localisation point reception, i.e. P _MinThe minimum signal power value of received eNB when expression UE can receive the service cell eNB switching command, λ represents eNB and the employed operation wavelength of UE, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression UE.

13: utilize the difference of the described critical distance and first distance to calculate the switching coverage.

Obtain first apart from x by above-mentioned steps ₁With critical distance y, by (y-x ₁) obtain above-mentioned switching coverage.Be appreciated that and weighted value or side-play amount also can be set when needing (y-x ₁) value adjust.

14: the measuring frequency of determining UE according to described switching coverage.

At this, only according to one-shot measurement report the carrying out switch decision of UE, i.e. the scene that switching occurs in after the one-shot measurement report describes with eNB, and hence one can see that will make handover success satisfy:

RT＜(y-x1) (7)

Wherein, R represents the movement velocity of UE, and R can be the equivalent uniform motion speed of UE when UE does variable motion.

Promptly in the common area of coverage of cell1 and cell2, that satisfies switching condition on the specific mobile alignment of UE has only x1 to segment distance so between the y.

If UE measures and belongs to rational situation n time satisfying reporting in the time interval of switching condition, just Ci Shi measurement curve can make measured value smoothly can react the power contrast of each sub-district again really, then according to effectively switching distance (y-x1) and reasonably measuring the measuring frequency that frequency n can be determined to draw more energy-conservation, a saving resource and can guarantee handover success rate.

Measuring frequency F _MeasSatisfy:

$\frac{1}{F_{\mathrm{meas}}}<\frac{y-x_1}{\mathrm{Rn}}---\left(8\right)$

Wherein, F _MeasThe measuring frequency of expression UE, y-x ₁Value representation switch coverage, n represents UE at the measurement number of times that reports in the time interval, R represents the movement velocity of UE, R can be the equivalent uniform motion speed of UE when UE does variable motion.

When the measuring frequency of choosing satisfies formula (8), just can avoid the too frequent measurement of UE, to the also reduction accordingly of performance requirement of UE.And from above-mentioned formula (8) also as can be seen, the performance of the terminal that places one's entire reliance upon determines that measuring frequency is irrational, and measuring frequency is not only to be determined by UE itself.

During actual the use, can provide a series of available n values, UE selects different n according to the channel circumstance of this concrete scene then according to the weak value of the concrete channel of measuring of former Serving cell.

When the measuring frequency to above-mentioned UE is optimized, suppose that usually T is constant.Yet further, this method embodiment can also be optimized to the time interval T that reports of UE configuration eNB according to the technical program.By above-mentioned analysis as can be known, T must move to this section period of y from x1 less than UE, if T can't realize successfully that greater than this time UE the sub-district switches.Like this, if under certain scene the frequent handoff failure of UE and when causing call drop, then eNB must consider to revise handoff parameter, this wherein just comprises T and O _FfDeng.

For example, can according to switching coverage service cell eNB be adjusted to the time interval that reports of UE configuration based on following formula:

RT＜(y-x ₁)

Wherein, y-x ₁Value representation switch coverage, R represents the movement velocity of UE, T represents to report the time interval.

As seen by above-mentioned, the embodiment of the invention provides a kind of scheme of definite terminal measuring frequency by analysing in depth the characteristics of terminal sub-district switching flow, has optimized the measuring frequency of terminal.The technical program has taken into full account the influence of network side to the terminal measuring frequency in conjunction with the handoff scenario of reality, based on terminal path loss for network side in switch the sub-district, pairing switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency, reached the technique effect that under the situation that guarantees the sub-district handover success rate, reduces the measuring frequency of terminal as much as possible for terminal.

The embodiment of the invention three also provides the device of determining the terminal measuring frequency in the switching of a kind of sub-district, and referring to Fig. 4, described device comprises:

First distance acquiring unit 41, be used for when terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, first distance of the base station eNB of distance service sub-district evolution;

Critical distance acquiring unit 42, be used to obtain the critical distance of terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

Switch coverage computing unit 43, be used to utilize the difference of the described critical distance and first distance to calculate the switching coverage;

Measuring frequency determining unit 44 is used for determining according to described switching coverage the measuring frequency of terminal.

Further, described switching condition be the difference of signal power value of the Serving cell that receives of signal power value and the terminal of the Target cell that receives of terminal more than or equal to predetermined threshold, described predetermined threshold is that service cell eNB is to the A3 of terminal configuration measurement deviant;

Described first distance acquiring unit 41, the difference of the signal power value of the Serving cell that the signal power value that specifically is used for the Target cell that receives when terminal and terminal receive is during first more than or equal to described A3 measurement deviant, and terminal is obtained first distance of distance service sub-district eNB.

Concrete, described first distance acquiring unit 41 is utilized the signal power value of the Target cell that following formula computing terminal receives or the signal power value of the Serving cell that terminal receives:

$P_r={\left(\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;r}}\right)}^2{P}_0{G}_1{G}_2$

Described critical distance acquiring unit 42 is used for calculating described critical distance by following formula:

$y=\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;}{\left(\frac{P_{\min }}{P_0{G}_1{G}_2}\right)}^{\frac{1}{2}}}$

Wherein, P in the above-mentioned formula _rThe signal power value of the sub-district that the expression terminal receives, r represents the distance of terminal apart from sub-district eNB, y represents critical distance, P _MinThe expression terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, and λ represents eNB and the employed operation wavelength of terminal, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression terminal.

Further, described measuring frequency determining unit 44 specifically is used to utilize following formula, determines the measuring frequency of terminal according to switching coverage:

$\frac{1}{F_{\mathrm{meas}}}<\frac{y-x_1}{\mathrm{Rn}}$

Wherein, F _MeasThe measuring frequency of expression terminal, y-x ₁Value representation switch coverage, R represents the movement velocity of terminal, n represents that terminal is at the measurement number of times that reports in the time interval.

The concrete working method of each functional module of apparatus of the present invention embodiment does not repeat them here referring to method embodiment of the present invention.

As seen by above-mentioned, the embodiment of the invention provides a kind of scheme of definite terminal measuring frequency by analysing in depth the characteristics of terminal sub-district switching flow, has optimized the measuring frequency of terminal.The technical program has taken into full account the influence of network side to the terminal measuring frequency in conjunction with the handoff scenario of reality, based on terminal path loss for network side in switch the sub-district, pairing switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency, reached the technique effect that under the situation that guarantees the sub-district handover success rate, reduces the measuring frequency of terminal as much as possible for terminal.

Those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can software product form embody, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (10)

1. determine the method for terminal measuring frequency during switch a sub-district, it is characterized in that described method comprises:

When terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, first distance of the base station eNB of distance service sub-district evolution; And,

Obtain the critical distance of terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

Utilize the difference of the described critical distance and first distance to calculate the switching coverage;

Determine the measuring frequency of terminal according to described switching coverage.

2. method according to claim 1 is characterized in that,

Described switching condition be the difference of signal power value of the Serving cell that receives of signal power value and the terminal of the Target cell that receives of terminal more than or equal to predetermined threshold, described predetermined threshold is that service cell eNB is to the A3 of terminal configuration measurement deviant;

Described when obtaining terminal first fit switching condition, first distance of the base station eNB of distance service sub-district evolution specifically comprises:

The difference of the signal power value of the Serving cell that the signal power value of the Target cell that receives when terminal and terminal receive is during first more than or equal to described A3 measurement deviant, and terminal is obtained first distance of distance service sub-district eNB.

3. method according to claim 2 is characterized in that, utilizes the signal power value of the Target cell that following formula computing terminal receives or the signal power value of the Serving cell that terminal receives:

$P_r={\left(\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;r}}\right)}^2{P}_0{G}_1{G}_2$

Wherein, P _rThe signal power value of the sub-district that the expression terminal receives, r represents the distance of terminal apart from sub-district eNB, λ represents eNB and the employed operation wavelength of terminal, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression terminal.

4. method according to claim 1 is characterized in that, the described critical distance of obtaining terminal distance service sub-district eNB comprises:

Calculate described critical distance by following formula:

$y=\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;}{\left(\frac{P_{\min }}{P_0{G}_1{G}_2}\right)}^{\frac{1}{2}}}$

Wherein, y represents critical distance, P _MinThe expression terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, and λ represents eNB and the employed operation wavelength of terminal, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression terminal.

5. method according to claim 1 is characterized in that, describedly determines that according to described switching coverage the measuring frequency of terminal comprises:

Utilize following formula, determine the measuring frequency of terminal according to switching coverage:

$\frac{1}{F_{\mathrm{meas}}}<\frac{y-x_1}{\mathrm{Rn}}$

Wherein, F _MeasThe measuring frequency of expression terminal, y-x ₁Value representation switch coverage, R represents the movement velocity of terminal, n represents that terminal is at the measurement number of times that reports in the time interval.

6. method according to claim 1 is characterized in that, described method also comprises:

Based on following formula, service cell eNB was adjusted to the time interval that reports of terminal configuration according to switching coverage:

RT＜(y-x ₁)

Wherein, y-x ₁Value representation switch coverage, R represents the movement velocity of terminal, T represents to report the time interval.

7. determine the device of terminal measuring frequency during switch a sub-district, it is characterized in that described device comprises:

First distance acquiring unit, be used for when terminal from Serving cell when Target cell moves, when obtaining terminal first fit switching condition, first distance of the base station eNB of distance service sub-district evolution;

The critical distance acquiring unit, be used to obtain the critical distance of terminal distance service sub-district eNB, described critical distance satisfies following condition: the location point of terminal distance service sub-district eNB critical distance is the critical localisation point, terminal can receive the switching command that service cell eNB issues at described critical localisation point, and then can't receive the switching command that service cell eNB issues from described critical localisation point when Target cell moves when terminal;

Switch the coverage computing unit, be used to utilize the difference of the described critical distance and first distance to calculate the switching coverage;

The measuring frequency determining unit is used for determining according to described switching coverage the measuring frequency of terminal.

8. device according to claim 7 is characterized in that,

Described switching condition be the difference of signal power value of the Serving cell that receives of signal power value and the terminal of the Target cell that receives of terminal more than or equal to predetermined threshold, described predetermined threshold is that service cell eNB is to the A3 of terminal configuration measurement deviant;

Described first distance acquiring unit, the difference of the signal power value of the Serving cell that the signal power value that specifically is used for the Target cell that receives when terminal and terminal receive is during first more than or equal to described A3 measurement deviant, and terminal is obtained first distance of distance service sub-district eNB.

9. device according to claim 8 is characterized in that,

Described first distance acquiring unit is utilized the signal power value of the Target cell that following formula computing terminal receives or the signal power value of the Serving cell that terminal receives:

$P_r={\left(\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;r}}\right)}^2{P}_0{G}_1{G}_2$

Described critical distance acquiring unit is used for calculating described critical distance by following formula:

$y=\frac{\mathrm{\&lambda;}}{4\mathrm{\&pi;}{\left(\frac{P_{\min }}{P_0{G}_1{G}_2}\right)}^{\frac{1}{2}}}$

Wherein, P _rThe signal power value of the sub-district that the expression terminal receives, r represents the distance of terminal apart from sub-district eNB, y represents critical distance, P _MinThe expression terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, and λ represents eNB and the employed operation wavelength of terminal, P ₀The transmission signal power value of expression eNB, G ₁The transmitter antenna gain (dBi) of expression eNB, G ₂The receiving antenna gain of expression terminal.

10. device according to claim 7 is characterized in that,

Described measuring frequency determining unit specifically is used to utilize following formula, determines the measuring frequency of terminal according to switching coverage:

$\frac{1}{F_{\mathrm{meas}}}<\frac{y-x_1}{\mathrm{Rn}}$

Wherein, F _MeasThe measuring frequency of expression terminal, y-x ₁Value representation switch coverage, R represents the movement velocity of terminal, n represents that terminal is at the measurement number of times that reports in the time interval.

Images