CN102098703B - 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

The method and apparatus of determining terminal measurement frequency in cell handover

Technical field

The present invention relates to wireless communication technique field, especially relate to a kind of method and apparatus of determining terminal measurement frequency in cell handover.

Background technology

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

A Mobility Management Entity (Mobility Management Entity, MME) in LTE can connect multiple eNB.Subscriber equipment (User Equipment, UE) can move around between multiple eNB, the mobility of UE in Here it is LTE.Mobility is a very important characteristic in LTE system, and UE can realize mobility by the cell reselection under the switching of connection status Xia community and idle condition.

In the time that UE switches from current area to Target cell, UE need to measure the power of the community detecting, UE measurement is a conclusive process, and the measurement holding water not only can reduce the probability of handoff failure, and the performance of UE is also had greatly improved.UE reports measured value the eNB of Serving cell by measurement report, and only has this measured value to meet while measuring report condition reporting in the time interval of regulation always, and UE just can be to eNB transmission measurement report.ENB sends switching command according to the measurement report receiving to UE, so that UE is switched to corresponding Target cell from current area.

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

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 completely.The measuring frequency that the UE that performance is good uses is high, and measurement is frequent, and measured value is relatively accurately level and smooth, but the effect of monitoring is all just played in most of measurement concerning UE, and measuring too is frequently that limited Radio Resource is too wasted again in power consumption; The measuring frequency that the UE of poor performance uses is just lower, and measured value is not accurate especially.

And UE realizes switching between community in network, and this method that measuring frequency is set based on UE performance completely of manufacturer terminal, not realistic situation, cannot obtain a rational measuring frequency.The measuring frequency that how to reduce as much as possible UE in the situation that guaranteeing community handover success rate has become one of focus of current research.

Summary of the invention

The embodiment of the present invention provides a kind of method and apparatus of determining terminal measurement frequency in cell handover, and a kind of scheme of optimizing terminal measuring frequency is provided, and can in the situation that guaranteeing community handover success rate, reduce as much as possible the measuring frequency of terminal.

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

The embodiment of the present invention provides a kind of method of determining terminal measurement frequency in cell handover, comprising:

In the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, the first distance of the base station eNB of distance service community evolution; And,

Obtain the critical distance of terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

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

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

The embodiment of the present invention also provides a kind of device of determining terminal measurement frequency in cell handover, comprising:

The first distance acquiring unit, in the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, the first distance of distance service community eNB;

Critical distance acquiring unit, for obtaining the critical distance of terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

Switch coverage computing unit, calculate switching coverage for the difference of utilizing described critical distance and the first distance;

Measuring frequency determining unit, for determining the measuring frequency of terminal according to described switching coverage.

From above-mentioned, the embodiment of the present invention, by analysing in depth the feature of terminal community switching flow, provides a kind of scheme of definite terminal measuring frequency, has optimized the measuring frequency of terminal.The technical program has taken into full account the impact of network side on terminal measuring frequency in conjunction with actual handoff scenario, based on terminal path loss for network side in switch community, corresponding switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency for terminal, reached the technique effect that reduces as much as possible the measuring frequency of terminal in the situation that guaranteeing community handover success rate.

Accompanying drawing explanation

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

The method flow schematic diagram of a kind of determining terminal measurement frequency in cell handover that Fig. 1 provides for the embodiment of the present invention one;

The community that Fig. 2 provides for the embodiment of the present invention switch in UE measurement procedure schematic diagram;

The Method And Principle schematic diagram of the determining terminal measurement frequency in cell handover that Fig. 3 provides for the embodiment of the present invention two;

The apparatus structure schematic diagram of a kind of determining terminal measurement frequency in cell handover that Fig. 4 provides for the embodiment of the present invention three.

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 is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.

The embodiment of the present invention one provides a kind of method of determining terminal measurement frequency in cell handover, and referring to Fig. 1, described method comprises:

11: in the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, first distance of the base station of distance service community evolution (evolved Node Base, eNB); And,

12: the critical distance of obtaining terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

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

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

Above-mentioned terminal can be subscriber equipment (User Equipment, UE), the first above-mentioned distance represents the distance of UE distance service center of housing estate (or signal emitting-source), at this, gets the distance of UE distance service community eNB as the first distance.

From above-mentioned, the embodiment of the present invention, by analysing in depth the feature of terminal community switching flow, provides a kind of scheme of definite terminal measuring frequency, has optimized the measuring frequency of terminal.The technical program has taken into full account the impact of network side on terminal measuring frequency in conjunction with actual handoff scenario, based on terminal path loss for network side in switch community, corresponding switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency for terminal, reached the technique effect that reduces as much as possible the measuring frequency of terminal in the situation that guaranteeing community handover success rate.

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

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

ENB resets message by above-mentioned RRC line and measures the relevant parameter of controlling to terminal configuration, and these parameters comprise the measurement control parameter of the A3 event of the 3rd layer (L3).

The part relevant parameter of L3 is passed to ground floor (L1) by 22:UE.

Because L1 cannot directly resolve the parameter of L3, so need UE to be passed to L1 after the Parameter analysis of electrochemical of the L3 such as the measurement control parameter of A3 event.

23:UE measures the power of the community detecting in cell switch process, obtains measured value.

Because the complexity of practical radio communication environment, may there is larger fluctuation in the measurement of UEDui community, in this case, may impact normal switching if measured value is not carried out to level and smooth conversion, so need to 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 carried out arithmetic average calculating for the measured value before utilizing and the measured value obtaining recently.

26: when measured value is in the time that reporting of regulation all meets report condition in the time interval, UE sends measurement report (MeasurementReport) to eNB, and the measured value after smoothing processing is reported to eNB.

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

The method of the determining terminal measurement frequency in cell handover below embodiment of the present invention two being provided is specifically described.Referring to Fig. 3, the scene that YiUECong community (CELL) 1 moves to community 2 is that example is described.Fig. 3 is a kind of schematic diagram of simplification, wherein, represent respectively the coverage of community 1 and community 2 with two circles with same radius L, distance between the eNB 1 of community 1 and the eNB2 of community 2 is d, and the lap in Fig. 3 between two circles represents the common region covering between community 1 and community 2.In Fig. 3, represent the movement locus of UE with the dotted line of arrow.Specifically comprise following processing:

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

In embodiments of the present invention, adopt a kind of method from 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 is that the signal power value of Target cell of UE reception and the difference of the signal power value of the Serving cell that UE receives are more than or equal to predetermined threshold, and described predetermined threshold is that service cell eNB is measured deviant O to the A3 of UE configuration _ff.At this moment, step 11 can be specially: in the time that the difference of the signal power value of Target cell of UE reception and the signal power value of the Serving cell of UE reception is more than or equal to described A3 measurement deviant first, UE obtains the first distance of distance service community eNB.

The signal power of the community that UE receives is to be determined from the distance of eNB, the transmitter antenna gain (dBi) of eNB, the factor such as receiving antenna gain and operation wavelength of UE by the transmitted signal power of eNB, UE, for example, in the time that UE is r from the distance of eNB, 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 that represents the community of UE reception, r represents the distance of UE apart from community eNB, λ represents the operation wavelength that eNB and UE use, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of UE.

In actual application scenarios, due to the complexity of wireless environment, actual received signal power also may be not exclusively determined from parameters such as distance, antenna gain and the operation wavelengths of base station by above-mentioned UE, for example, local geographical environment has also caused larger impact to signal power value, now, can carry out suitable adjustment according to real situation.

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

According to foregoing, 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 _r1represent the signal power value of the community 1 of UE reception, x ₁represent the distance of UE apart from community 1, P _r2represent the signal power value of the community 2 of UE reception, x ₂represent the distance of UE apart from community 2.

The difference of the signal power value of Ze Dang community 1 and community 2 equals A3 and measures deviant O _fftime, can obtain 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 that can be obtained the residing location point of UE while meeting switching condition for the first time by above-mentioned formula (5), is expressed as A point by this location point, and A point is the distance x from Serving cell at UE ₁with the distance x of UE from adjacent cell ₂distance meet the point at equation (5) place, now, UE obtain from service cell eNB 1 first apart from x ₁.Referring to Fig. 3, in the some A process that represents to move to community 2 UECong community 1, an example of present location point when first fit switching condition on a certain specific movement locus.

12: the critical distance of obtaining UE distance service community eNB, described critical distance meets following condition: the location point of UE distance service community eNB critical distance is critical localisation point, UE can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that UE moves from described critical localisation point to Target cell.

Above-mentioned critical distance is UE maximum distance apart from eNB1 can receive the switching command that service cell eNB 1 issues 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 _minrepresent that 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 that represents eNB received when UE can receive service cell eNB switching command, λ represents the operation wavelength that eNB and UE use, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of UE.

13: utilize the difference of described critical distance and the first distance to calculate 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 while needs and weighted value or side-play amount also can be set to (y-x ₁) value adjust.

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

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

RT＜(y-x1) (7)

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

In the common area of coverage of cell1 and cell2, what on the specific mobile alignment of UE, meet switching condition only has x1 to segment distance so between y.

If UE measures the rational situation that belongs to for n time meeting reporting of switching condition in the time interval, namely measurement curve now can make measured value smoothly can react really again the power contrast of each community, according to effectively switch distance (y-x1) and reasonably measurement frequency n can determine the measuring frequency that draws a relative energy-saving, saving resource and can guarantee handover success rate.

Measuring frequency F _measmeet:

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

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

In the time that the measuring frequency of choosing meets formula (8), just can avoid UE to measure too frequently, the performance requirement of UE is also reduced accordingly.And, also can find out from above-mentioned formula (8), the performance of the terminal that places one's entire reliance upon determines that measuring frequency is irrational, measuring frequency is not only to be determined by UE itself.

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

In the time that the measuring frequency of above-mentioned UE is optimized, conventionally suppose that T is constant.But further, this method embodiment can also be optimized to the time interval T that reports of UE configuration eNB according to the technical program.Known by above-mentioned analysis, T must be less than UE and move to from x1 this period of time of y, cannot successfully realize community and switches if T is greater than this time UE.Like this, if under certain scene the frequent handoff failure of UE and while causing call drop, eNB must consider to revise handoff parameter, this wherein just comprises T and O _ffdeng.

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

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.

From above-mentioned, the embodiment of the present invention, by analysing in depth the feature of terminal community switching flow, provides a kind of scheme of definite terminal measuring frequency, has optimized the measuring frequency of terminal.The technical program has taken into full account the impact of network side on terminal measuring frequency in conjunction with actual handoff scenario, based on terminal path loss for network side in switch community, corresponding switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency for terminal, reached the technique effect that reduces as much as possible the measuring frequency of terminal in the situation that guaranteeing community handover success rate.

The embodiment of the present invention three also provides a kind of device of determining terminal measurement frequency in cell handover, and referring to Fig. 4, described device comprises:

The first distance acquiring unit 41, in the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, the first distance of the base station eNB of distance service community evolution;

Critical distance acquiring unit 42, for obtaining the critical distance of terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

Switch coverage computing unit 43, calculate switching coverage for the difference of utilizing described critical distance and the first distance;

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

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

Described the first distance acquiring unit 41, while measuring deviant specifically for being more than or equal to first described A3 when the difference of the signal power value of Target cell of terminal reception and the signal power value of the Serving cell of terminal reception, terminal is obtained the first distance of distance service community eNB.

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

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

Described critical distance acquiring unit 42, 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 above-mentioned formula _rthe signal power value that represents the community of terminal reception, r represents the distance of terminal apart from community eNB, y represents critical distance, P _minrepresent that terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, λ represents the operation wavelength that eNB and terminal are used, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of terminal.

Further, described measuring frequency determining unit 44, specifically for utilizing 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 _measrepresent the measuring frequency of 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 reporting in the time interval.

The specific works mode of the each functional module of apparatus of the present invention embodiment, referring to embodiment of the method for the present invention, does not repeat them here.

From above-mentioned, the embodiment of the present invention, by analysing in depth the feature of terminal community switching flow, provides a kind of scheme of definite terminal measuring frequency, has optimized the measuring frequency of terminal.The technical program has taken into full account the impact of network side on terminal measuring frequency in conjunction with actual handoff scenario, based on terminal path loss for network side in switch community, corresponding switching coverage when computing terminal can successful switch on its mobile alignment, utilize this switching coverage to choose a suitable measuring frequency for terminal, reached the technique effect that reduces as much as possible the measuring frequency of terminal in the situation that guaranteeing community handover success rate.

Those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize.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 storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the present invention or embodiment.

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

Claims (8)

1. a method for determining terminal measurement frequency in cell handover, is characterized in that, described method comprises:

In the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, the first distance of the base station eNB of distance service community evolution; And,

Obtain the critical distance of terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

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

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

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

Described while obtaining terminal first fit switching condition, the first distance of the base station eNB of distance service community evolution specifically comprises:

In the time that the difference of the signal power value of Target cell of terminal reception and the signal power value of the Serving cell of terminal reception is more than or equal to described A3 measurement deviant first, terminal is obtained the first distance of distance service community eNB.

2. method according to claim 1, is characterized in that, the signal power value of Target cell or the signal power value of the Serving cell that terminal receives of utilizing following formula computing terminal to receive:

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

Wherein, P _rthe signal power value that represents the community of terminal reception, r represents the distance of terminal apart from community eNB, λ represents the operation wavelength that eNB and terminal are used, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of terminal.

3. method according to claim 1, is characterized in that, described in obtain terminal distance service community eNB critical distance comprise:

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 _minrepresent that terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, λ represents the operation wavelength that eNB and terminal are used, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of terminal.

4. 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 _measrepresent the measuring frequency of 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 reporting in the time interval.

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

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

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.

6. a device for determining terminal measurement frequency in cell handover, is characterized in that, described device comprises:

The first distance acquiring unit, in the time that terminal moves from Serving cell to Target cell, while obtaining terminal first fit switching condition, the first distance of the base station eNB of distance service community evolution;

Critical distance acquiring unit, for obtaining the critical distance of terminal distance service community eNB, described critical distance meets following condition: the location point of terminal distance service community eNB critical distance is critical localisation point, terminal can receive at described critical localisation point the switching command that service cell eNB issues, and cannot receive the switching command that service cell eNB issues in the time that terminal moves from described critical localisation point to Target cell;

Switch coverage computing unit, calculate switching coverage for the difference of utilizing described critical distance and the first distance;

Measuring frequency determining unit, for determining the measuring frequency of terminal according to described switching coverage;

Wherein,

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

Described the first distance acquiring unit, while measuring deviant specifically for being more than or equal to first described A3 when the difference of the signal power value of Target cell of terminal reception and the signal power value of the Serving cell of terminal reception, terminal is obtained the first distance of distance service community eNB.

7. device according to claim 6, is characterized in that,

The signal power value of the Target cell that the following formula computing terminal of described the first distance acquiring unit utilization 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, 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 that represents the community of terminal reception, r represents the distance of terminal apart from community eNB, y represents critical distance, P _minrepresent that terminal is positioned at the signal power value of the Serving cell of critical localisation point reception, λ represents the operation wavelength that eNB and terminal are used, P ₀represent the transmitted signal performance number of eNB, G ₁represent the transmitter antenna gain (dBi) of eNB, G ₂represent the receiving antenna gain of terminal.

8. device according to claim 6, is characterized in that,

Described measuring frequency determining unit, specifically for utilizing 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 _measrepresent the measuring frequency of 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 reporting in the time interval.

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