CN102958123A - Method, wireless communication system and device for switching mobile terminal into target cell - Google Patents

Abstract

The invention discloses a method and a device for switching a mobile terminal into a target cell. The method comprises the steps of: determining position information of the mobile terminal at a base station aiming at each activated and centralized target candidate area, and referring to switching of a pilot strength policy of the activated and centralized target candidate area to the target candidate area based on the position information of the mobile terminal. By the embodiment of the invention, the possible frequent switching problem can be restrained; high-speed data transmission of a small cell is fully utilized, and a call drop caused by switching for a plurality of times also can be reduced to improve user experience, and even load balance can be carried out on the basis of the position information such as speed. For example, a high-speed mobile terminal has more chances to serve by a macrocell while a low-speed mobile terminal is more likely to be served by a microcell.

Description

Portable terminal is switched to method, wireless communication system and the equipment of Target cell

Technical field

The present invention relates to radio communication, more specifically, relate in the switching of mobile terminal in radio communication system to Target cell.

Background technology

Along with being widely used of smart phone, data service is along with the variation in time and space presents tidal effect.And network technology has developed into the 4th algebraically word communication (being called for short 4G) technology from third generation digital communication (be called for short 3G) technology, satisfies people to faster, the demand of transmitted data amount and multiple business more.CDMA EVDO technology is one of 3G (Third Generation) Moblie (being called for short 3G) technology, and it has higher data throughout, and data, services at a high speed can be provided, and is the good technology for data, services.In the 3GPP2 standard, EVDO is also referred to as HRPD.And the LTE technology is 4G mobile communication mainstream technology, and the peak rate of descending 326Mbit/s and up 86Mbit/s can be provided under the 20MHz spectral bandwidth, has improved the performance of Cell Edge User, improves cell capacity and reduces system delay.

In the downtown, the high density of the mobile device of the hot zones such as airport, railway station or bus stop uses necessitate so that cover to improve communication quality by focus.Along with the further increase of people to capacity requirement, in present cellular mobile telecommunication system, main by under macrocellular, introducing microcellulor and Pico cell (in an embodiment of the present invention, the two can be integrated general reference and be Microcell, English is Pico cell, and is corresponding with macrocell) so that more " including " honeycomb to be provided, form the hierarchical cellular structure, thereby " blind spot " and " focus " in the solution network improves network capacity.The Microcell radius is much smaller than macrocell, and very high volume of business can be provided.The general covering radius of Microcell is approximately 0.1km～1km.The typical radius of society of Pico cell is between 0.01～0.1km, usually less than 50m.

The Microcell solution can cost effectively the extended wireless network coverage and capacity, and simultaneously from the grand network offload voice-and-data traffic carrying capacity of mobile operator.By being deployed in neatly in family, enterprise and the hot spot region, city, and provide service-specific to resident, enterprise and city focus, Microcell can improve data service throughput and voice capacity.Along with the development of LTE technology, can adopt the LTE technology to be used as focus and cover.Since in most of the cases, LTE (its operating frequency is generally 2.4G or 5.8G) is higher than the frequency of EVDO (operating frequency is generally 800M etc.) work, with and the overlay area less, so the LTE residential quarter also can be regarded one type Microcell as.Simultaneously, the Microcell that uses the EVDO technology is for the focus of LTE carrier wave covers also is attractive because policy and technical risk are not wanted to dispose very soon.

Some researchs concentrate at cell edge and center and dispose little residential quarter.Studies show that, arrange with the center of housing estate Microcell and compare, cell edge is disposed can provide better performance.

For example, Fig. 1 shows the many picocell deployment in the typical macrocell, wherein has a sector, 19 residential quarter/57, (covering radius is in 100 meters for 4 Microcells in each sector in this is disposed, illustrate with triangle) dispose at cell edge, grand in 1732 meters of grand website distances, slightly arrive 700 meters of grand website distances.

To those skilled in the art, macrocell can use the EVDO technology, and Microcell also can use EVDO or LTE technology.

Typical Microcell is shown Fig. 2 and macrocell mixes the deployment situation, and wherein macrocell and Microcell are managed by operator.As shown in Figure 2, Microcell is deployed in the macrocell edge usually.If portable terminal (MS) enters the Microcell overlay area, then it can detect the pilot tone from adjacent macro cell simultaneously.

Fig. 3 illustration the schematic diagram that in the situation shown in Fig. 2, switches.In order to clearly demonstrate the problem of existence, the radius of supposing Microcell is 50 meters.If portable terminal is mobile to C (A, B and C in the drawings from right to left arrange) through B from A with 50 kilometers/hour, portable terminal will stop at most 7 (being 2*50/ (50/3.6)=7) second at this Microcell.As a rule, in fact it only stops within 5 seconds at Microcell.If Microcell and macrocell all are based on EVDO, then will be 300ms switching time.Macrocell is based on EVDO if Microcell is based on LTE, and situation is with even worse.To spend about 6-8 second the unoptimizable switching time between EVDO and the LTE.

And the covering of Microcell is limited to very much, this means that this portable terminal covers finishing the Microcell that will leave this LTE before switching to Microcell.Therefore, point enters into Microcell if portable terminal moves to B, just begin portable terminal is switched to Microcell, then probably before switching is finished portable terminal moved to the C point, left this Microcell this moment, then portable terminal begins to switch to other Microcell again, thereby causes frequent switching problem.Too many hand off signaling will be wasted air interface and backhaul resources.Also can cause the signaling overload and call out the significant problem of cutting off rate and switch frequently, so that user's conversation experience is relatively poor.

This problem is particularly remarkable when the portable terminal high-speed motion, for example has many passengers' train or bus rapid transit when crossing by the street grand and block that Microcell covers.

But temporary respite switching in indiscriminate ground also can be with the problem of serving under this kind scene, such as bringing the problems such as throughput decline and cutting off rate rising.

Therefore, this area can effectively utilize the high-speed transfer of little residential quarter and not cause frequently the changing method that switches in the urgent need to a kind of.

Summary of the invention

For this reason, the present invention proposes the auxiliary moving administrative mechanism of position-based information, it attempts using such as position, speed (to those skilled in the art, speed is the function of position, so speed can be regarded a kind of of positional information as), the positional information of parameter that location factor and/or the position influence factor etc. are relevant with the position helps switch.This is particularly useful in the deployment situation that little-macrocell mixes.

According to an aspect of the present invention, a kind of method for portable terminal being switched to Target cell is provided, described Target cell comprises Microcell, and the method can comprise: the positional information of determining portable terminal at the place, base station for each target candidate residential quarter in the Active Set; And based on the positional information of described portable terminal with reference to the make a strategic decision switching of described target candidate residential quarter of the pilot frequency intensity of the target candidate residential quarter in the described Active Set.

Preferably, described steps in decision-making may further include: predict whether described portable terminal is in the zone line of the target candidate residential quarter in the described Active Set; Be in the zone line of described target candidate residential quarter if predict described portable terminal, then comparison prediction is in the pilot frequency intensity of the described target candidate residential quarter in its middle zone; And based on the pilot frequency intensity of described target candidate residential quarter, decision-making is from described former Serving cell to having the switching of the target candidate residential quarter of strong pilot frequency intensity.

Preferably, the described portable terminal of the described prediction step that whether is in the zone line of target candidate residential quarter can further comprise: the position of prediction described portable terminal after predetermined residence time; Determine the relative position of described portable terminal and target candidate residential quarter after described residence time; And the zone line that whether after predetermined residence time, is in the target candidate residential quarter based on the described portable terminal of this Relative position determination.

Preferably, the step of the relative position of described definite described portable terminal and target candidate residential quarter can further comprise: the relative position of determining described portable terminal and target candidate residential quarter based on following equation: L _f=L/R, wherein, L _fBe location factor, L is the distance between portable terminal and the target BS, and R is the radius of target candidate residential quarter.

Preferably, the step of determining the relative position of described portable terminal and target candidate residential quarter can further comprise: primary importance and the second place of determining described portable terminal; Calculate the speed of described portable terminal; The 3rd position of prediction described portable terminal after predetermined residence time; And the relative position of determining described portable terminal and target candidate residential quarter for described the 3rd position based on above-mentioned formula.

Preferably, predict that the step whether described portable terminal is in the zone line of target candidate residential quarter can further comprise: the position of determining described portable terminal; Calculate the speed of described portable terminal; The ratio of the diameter of more described speed and described target candidate residential quarter and the minimum residence time of this residential quarter; And determine that based on described comparative result whether described portable terminal is in the zone line of target candidate residential quarter after predetermined residence time.

Preferably, the described step of determining whether described portable terminal is in the zone line of target candidate residential quarter after predetermined residence time can further comprise: if described location factor greater than predetermined threshold or described speed greater than above-mentioned ratio, then definite described portable terminal is in beyond the edge or cell coverage area of target candidate residential quarter; Otherwise, determine that described portable terminal is in the zone line of target candidate residential quarter.

Preferably, described decision-making can further comprise to the switch step of described target candidate residential quarter: determine the position influence factor for the described target candidate residential quarter in the Active Set based on the positional information of described portable terminal, the described position influence factor has characterized the position of portable terminal to the influence degree of pilot frequency intensity; Relatively the pilot frequency intensity of each target candidate residential quarter and the position influence factor is poor; And decision-making switches to the target candidate residential quarter of the difference with maximum pilot frequency intensity and position influence factor.

Preferably, described method also can comprise: send the message that comprises for the location-based pilot frequency intensity adjustment information of the described portable terminal of the target candidate residential quarter in the Active Set at base station place to described portable terminal, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal.

According to other aspect of the present invention, a kind of method for portable terminal being switched to Target cell is provided, can comprise: receive at described portable terminal place from the base station, pointer is to the message of the location-based pilot frequency intensity adjustment information of the target candidate residential quarter in the Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity; And based on the switching of the described portable terminal decision-making of described pilot frequency intensity adjustment information from described former Serving cell to the target candidate residential quarter.

Preferably, the described former Serving cell of described decision-making may further include to the step of the switching of target candidate residential quarter: switch to the target candidate switching cell with maximum comprehensive pilot frequency intensity from former Serving cell based on comprehensive pilot frequency intensity maximal criterion.

According to other aspect of the present invention, a kind of base station also is provided, it can comprise: determining unit, for the position of determining portable terminal; Computing unit is for the positional information that comprises location factor or speed of calculating described portable terminal; And decision package, be used for the switching to described target candidate residential quarter of assisting with reference to the pilot frequency intensity decision-making position-based of the target candidate residential quarter of described Active Set based on the positional information of described portable terminal.

Preferably, the described computing unit original position factor that also can be configured to calculate described portable terminal is to determine whether described portable terminal is in beyond the edge or cell coverage area of source Serving cell.

Preferably, whether the described computing unit size that also is configured the ratio of more described speed and cell diameter and predetermined service time is in the zone line of target candidate residential quarter with prediction described portable terminal after predetermined service time.

According to other aspect of the present invention, a kind of portable terminal also is provided, comprise: receiving element, be used for to receive from the pointer of the base station message to the location-based pilot frequency intensity adjustment information of the target candidate residential quarter of Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity; Resolution unit is used for from the location-based pilot frequency intensity adjustment information of described message extraction for the target candidate residential quarter the Active Set; Decision package is used for based on the auxiliary switching to described target candidate residential quarter of described pilot frequency intensity adjustment information decision-making position-based.

According to other aspect of the present invention, also comprise a kind of computer program, it has computer-readable instruction, when its when computing equipment moves, be configured to carry out aforesaid method.

In an embodiment of the present invention, by introducing the auxiliary handover mechanism of position-based information, can suppress the frequent switching problem that may occur, and take full advantage of the high speed data transfer of Microcell, can also reduce owing to too much switching the call drop that causes to improve user's experience, even can also carry out load balance based on the positional information such as speed, for example high speed mobile terminal will have more multimachine and can be served by macrocell, and the low speed portable terminal will more may be served by Microcell.

Description of drawings

According to the following specifically describes of carrying out by reference to the accompanying drawings, will more be expressly understood exemplary embodiment.Fig. 1-10 represents non-limiting, exemplary embodiment, wherein:

Fig. 1 illustration typical many picocell deployment in macrocell of the prior art;

Fig. 2 illustration typical Microcell of the prior art and macrocell mix the deployment situation;

Fig. 3 illustration the schematic diagram that in the situation shown in Fig. 2, switches;

Fig. 4 illustration the physical model of location factor according to an embodiment of the invention;

Fig. 5 illustration in communication network, carry out according to an embodiment of the invention the flow chart of location aided rebroadcast handover decisions.

Fig. 6 illustration according to an embodiment of the invention at the flow chart of base station side in the auxiliary decision-making of switching of the basic enterprising line position of position judgment;

Fig. 7 illustration the flow chart that carries out the location aided rebroadcast switchover policy of the position-based factor according to an embodiment of the invention;

Fig. 8 illustration according to an embodiment of the invention based on the flow chart that carries out the location aided rebroadcast switchover policy of speed;

Fig. 9 illustration carry out according to an embodiment of the invention the flow chart of the decision-making that location aided rebroadcast switches at base station side position-based factor of influence;

Figure 10 illustration in communication system, carry out according to an embodiment of the invention according to an embodiment of the invention the flow chart of the auxiliary location aided rebroadcast handover decisions of portable terminal under the EVDO environment;

Figure 11 illustration the block diagram of base station according to an embodiment of the invention; And

Figure 12 illustration the block diagram of portable terminal according to an embodiment of the invention.

Embodiment

Referring now to accompanying drawing embodiments of the invention are described more intactly, shown in it some but be not all embodiment of the invention.Certainly, the present invention can be by many multi-form realizations, and should not be construed the restriction to the embodiment that sets forth here; On the contrary, provide these embodiment, thereby the present invention will satisfy applicable legal requirements.Wherein like numerals will refers to analogous element.

It shall yet further be noted that in some alternatives, the function/behavior of proposition may with from different the occurring in sequence shown in the accompanying drawing.For example, two figure shown in continuously can carry out in fact substantially simultaneously, or can sometimes carry out function/behavior that this foundation relates to reverse order.

Unless opposite definition, all terms used herein (comprising technology and scientific terminology) have the identical meanings of understanding with the exemplary embodiment those skilled in the art.Should also be understood that term (for example defining in the general dictionary) should be interpreted as having in the environment with association area their consistent implication of implication, and do not explain from idealized or undue formalization aspect, unless clearly definition here.

Provide part of the present invention and relevant details to describe according to the symbolic representation of the operation of the data bit in the computer storage and software or algorithm.These descriptions and expression are that those skilled in the art are whereby to the means of their action of others skilled in the art's effective communication.As term used herein, and normally used as it, algorithm can think to cause expected result step certainly be in harmony sequence.Step is those steps that need the physical operations physical quantity.Usually, although unnecessary, the form of light, electricity or magnetic signal that this tittle adopts and can store, transmits, makes up, compares and handles.Often prove easily, for general, these signals are called bit, value, element, symbol, word, item, numeral etc. on the principle.

In the following description, (comprise routine, program, object, assembly, data result etc. with reference to can be used as program module or functional processing, it is carried out particular task or realizes particular abstract data type, and can be in the existing network unit or the control Nodes use existing hardware to realize) behavior and the symbolic representation (for example in a flowchart) of the operation that realizes describe exemplary embodiment.Such existing hardware can comprise one or more CPU (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) computer etc.

Yet, should remember, all these are relevant with the suitable physical amount with similar terms, and only are the labels that makes things convenient for that is applied to this tittle.Unless special the elaboration, or from discussing clearly, refer to behavior and the processing of computer system or similar electronic computing device such as the term of " processing " or " calculating " or " determining " or " decision-making " etc., the data that are expressed as physics, amount of electrons in the RS of its operation computer system also are transformed to similar other data that are expressed as the physical quantity in the such information-storing device of computer system memory or register or other, transmission or the display device with it.

Typically encoding at certain program recorded medium in the aspect that it shall yet further be noted that software realization of the present invention, or realizes at the transmission medium of some types.Program recorded medium can be magnetic (for example floppy disk or hard disk drive) or light (for example compact disk read-only memory or " CD ROM "), and can be read-only or arbitrary access.Similarly, transmission medium can be twisted-pair feeder, coaxial cable, optical fiber or other suitable transmission mediums more known in the art.The present invention is not subject to the restriction of these aspects of any given scheme.

Existing changing method is based on the pilot frequency intensity that detects from portable terminal, and this value is by the E of all useful multipath components in the portable terminal joint account search window _c/ I _oAnd obtain.For example, under the environment based on the EVDO technology, if portable terminal measures the E of residential quarter B on the forward link _c/ I _oE greater than residential quarter A _c/ I _o, this terminal can attempt asking the data from residential quarter B, and then portable terminal is reported pilot frequency intensity by routing update message (for example the Route Uupdate Message among the EVDO is called for short RUM message).Can also be by the load balancing feature of being introduced by EVDO rev.C standard (3GPP2C.S0024-Cv1.0), reference signal quality and business load state carry out handover decisions.As mentioned above, mix under the deployment situation at macrocell and Microcell, the portable terminal fast moving can produce the problems such as frequent switching.

Mix the problems such as frequent switching of disposing under the situation in order to solve at macrocell and Microcell, in an embodiment of the present invention, the location aided rebroadcast handover mechanism has been proposed, its basic conception is by introducing the positional information relevant with the position such as location factor (characterizing the relative position of portable terminal and target candidate residential quarter), come relative position and pilot frequency intensity, thereby can determine whether switch to the target candidate Microcell in conjunction with pilot frequency intensity position-based information.

In an embodiment of the present invention, for simplicity, (BS) and portable terminal (MS) illustrate the operation of the decision-making location aided rebroadcast switching in cordless communication network as example take the base station.But those skilled in the art should understand that, in different communication networks, the title that the base station is corresponding different, for example in the EVDO communication network of third generation partner program 2 (3GPP2) definition, entity corresponding to base station is called AN (Access Network), and in the WCDMA and LTE communication network of third generation partner program (3GPP) definition, entity corresponding to base station is called NodeB and eNode B, in this collectively is the base station.

Fig. 4 illustration the physical model of location factor according to an embodiment of the invention.In an embodiment of the present invention, shown in Fig. 4 A, in order to address the above problem, introduce location factor (L _f), the positional information that it is included in the portable terminal of base station under covering can characterize the relative position of portable terminal and residential quarter, is defined as follows:

L _f＝L/R (1)

Wherein L is the relative distance of the base station of portable terminal and residential quarter, and R is radius of society.

Shown in Fig. 4 B, in an embodiment of the present invention, can the setting position threshold alpha.

If L _f＜=α determines that then travelling carriage is in the zone line of cell/section (zone shown in the blank), and has more trend to be served by current area/sector.

If L _f＞α can determine that travelling carriage is in outside the fringe region of residential quarter (shown in the shade zone) or the residential quarter, and is not the best by current area/sector service quality.Especially, if L _f＞1, mean that then travelling carriage has left the coverage of residential quarter.

In an embodiment of the present invention, α is configurable value, and for example its scope can be between 70% to 90%.

Shown in Fig. 4 C, portable terminal is that (coordinate is X1 to L1 from the position, Y1) A point moves into place and is set to L2 (coordinate is X2, Y2) B point, and move to the C point with this direction after second at m, m can be the predetermined residence time of residential quarter, and minimum residence time for example, this minimum residence time refer to the minimum time that must stop in this residential quarter.This parameter can configure in the base station, will be described in detail below.

For the purpose of knowing brief description, can characterize portable terminal in the movement of this residential quarter by linear uniform motion.Suppose that it is two position A of T and coordinate L1 and the L2 of B that the base station obtains the time interval, can estimate by following formula the moving velocity vector of portable terminal:

$\stackrel{\→}{V}=\stackrel{\→}{D}(L1,L2)T---\left(2\right)$

At this

That A is to the displacement vector of B.

Then the C position coordinates L3 of ordering can by as the prediction of getting off:

$\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HDA0000087406380000042.png"\; state="\{\{state\}\}">L</figure-callout>}3=m\stackrel{\&RightArrow;}{V}+L2---\left(3\right)$

By adopt above-mentioned location factor can predict predetermined residence time for example after the minimum residence time this portable terminal whether be in this place, residential quarter.

For example, according to the new position L3 that formula (3) obtains predicting, the distance by L3 coordinate and target candidate switching cell base station center position coordinates obtains the relative distance L between it, calculates the L of target candidate switching cell by formula (1) _f, and compare with threshold alpha, if greater than α, then show this time after portable terminal will be in the edge of this residential quarter or leave this residential quarter.

In a further embodiment, can also introduce positional information such as speed.For the purpose of knowing brief description, can characterize portable terminal in the movement of this residential quarter by linear uniform motion.By determining portable terminal at least twice position at certain time intervals, can determine the speed of this portable terminal.

Yet, it will be understood by those skilled in the art that any motion mode of portable terminal in cellular cell all is possible, can use location information, determine the speed of portable terminal according to existing physics and geometric knowledge.

So for those skilled in the art, if this speed V greater than covering diameter (getting the maximum span of coverage at this) 2R of this residential quarter with at the predetermined residence time of this residential quarter ratio of minimum residence time m for example, can be understood as then that this portable terminal will shift out this residential quarter after this residence time.Therefore speed also can characterize the relative position of portable terminal and residential quarter to a certain extent.

To those skilled in the art, for example minimum residence time m is by default for the predetermined residence time of residential quarter, if portable terminal wants to switch to Microcell, it must stop m second at least.Determining of this value is relevant with the handoff time (for example switching between the EVDO system different districts) of identical systems and the handoff time of different system (for example the switching of LTE residential quarter is arrived in the EVDO residential quarter), can also be relevant with index requests such as the cutting off rate of system, signaling load designs.

Suppose between transfer period it is t, then make m=nt, wherein n is configurable value.For example, only supposing under the minimum residence time prerequisite relevant with handoff time, if at last 300 milliseconds in advance of switching times, and n is set as 10, then m=3 second.

In an embodiment of the present invention, also introduced a kind of positional information that is called the position influence factor.Be similar to the adjusted value with respect to load parameter (LoadingAdjust) (referring to 3GPP2C.S0024-Cv1.0) in the load balancing situation, the position influence factor in the embodiment of the invention has characterized the location parameter of portable terminal to the influence degree of pilot frequency intensity.Because the sign E of pilot frequency intensity _c/ I _oCorresponding with SNIR (ratio of signal and interference plus noise is called for short signal to noise ratio among the present invention), in an embodiment of the present invention, this pilot frequency intensity can be used signal to noise ratio, and namely SINR represents.In an embodiment of the present invention, this position influence factor can be pilot frequency intensity with respect to the adjusted value of location parameter (that is, comprehensive pilot frequency intensity can be SINR-PositionAdjust), and unit is dB.

Location factor L _fBe mapped as the PositionAdjust take dB as unit method can as:

PositionAdjust＝b＊lg(L _f)(4)

Wherein b is positive integer, and the suggestion value is between 1 to 30.

For example: the position is 100 meters apart from the target BS distance, and the radius of target BS is 50 meters, if get b=20, then location factor is: 20lg (100/50)=6dB.

In an embodiment of the present invention, setting position factor of influence by the following: in Microcell, assumed position factor of influence max threshold is 5dB.Then method to set up can for: if L _f＞α, then PositionAdjust=5dB; Otherwise, PositionAdjust=0dB.This simple mapping method can avoid location factor excessive for the Decision Making Effect that switches by restriction site factor of influence max threshold.

In an embodiment of the present invention, preferably, this parameter can be the adjusted value with respect to load parameter and location parameter (that is, comprehensive pilot frequency intensity is SINR-LoadingAdjust-PositionAdjust) of signal to noise ratio.

It will be understood by those skilled in the art that any method that can the calculating location factor of influence all can be applied in the embodiments of the invention, above only is illustration, and embodiments of the invention are not limited to above-mentioned example.

In an embodiment of the present invention, provide a kind of method for portable terminal being switched to Target cell, can comprise: the positional information of determining portable terminal at the place, base station for each target candidate residential quarter in the Active Set; And based on the positional information of described portable terminal with reference to the make a strategic decision switching of described target candidate residential quarter of the pilot frequency intensity of the target candidate residential quarter in the described Active Set.

In an embodiment of the present invention, preferably, described decision-making can further comprise to the switch step of described target candidate residential quarter: predict whether described portable terminal is in the zone line of the target candidate residential quarter in the described Active Set; Be in the zone line of described target candidate residential quarter if predict described portable terminal, then comparison prediction is in the pilot frequency intensity of the described target candidate residential quarter in its middle zone; And based on the pilot frequency intensity of described target candidate residential quarter, decision-making is from described former Serving cell to having the switching of the target candidate residential quarter of strong pilot frequency intensity.

In an embodiment of the present invention, preferably, described decision-making further comprises to the switch step of described target candidate residential quarter: determine the position influence factor for the described target candidate residential quarter in the Active Set based on the positional information of described portable terminal, the described position influence factor has characterized the position of portable terminal to the influence degree of pilot frequency intensity; Relatively the pilot frequency intensity of each target candidate residential quarter and the position influence factor is poor; Decision-making switches to the target candidate residential quarter of the difference with maximum pilot frequency intensity and position influence factor.

Fig. 5 illustration the flow chart of the handover decisions of position-based information in communication network according to an embodiment of the invention.Suppose that travelling carriage wants to switch to cell/section B (target cell/sector, for example Microcell) from cell/section A (source service cell/sector, for example macrocell).As shown in Figure 5, at step S501, the Event triggered portable terminal occurs measure, these events such as pilot measurement time timer expires or activates pilot set variation etc.

Next, at step S503, thereby detecting pilot tone at portable terminal changes some timer in increase and decrease that pilot tone in the Active Set will occur or the base station and expires and trigger routing update and measure in the situation of request (such as route update request) etc. each base station pilot intensity parameters that portable terminal measures to the base station reporting terminal.In different networks, can report with dissimilar message.For example, under the EVDO environment, travelling carriage reports to the base station its measurement result with routing update RUM message.The form of this message will describe in detail below.

At step S505, the positional information of portable terminal is determined in the base station, can comprise any information or the parameter of position, location factor, speed or the position influence factor etc. and location association in this positional information.

In an embodiment of the present invention, various known and applicable methods in future can be adopted in the position of determining portable terminal, known method such as global position system GPS technology commonly used, signal strength signal intensity, time-based method (time of advent and the time of advent are poor) and the time of advent poor and round-trip delay method etc.Brief description is as follows:

1. global position system GPS technology GPS is based on the navigation system of satellite.Gps receiver must lock onto the signal of at least three satellites to calculate 2D position (longitude and latitude).By visible 4 or more satellites, receiver can be determined user's 3D position (longitude, latitude and height).

2. the radio position finding radio directional bearing of signal strength signal intensity use signal strength signal intensity is the known localization method of Mathematical Modeling that uses known description strength retrogression with the variation of distance.Because the measurement of signal strength signal intensity provides the range estimation between terminal and the BS, so terminal must be positioned at a plurality of BS is the center of circle, take a plurality of intersection points of terminal to the estimated distance of each BS as a plurality of circumference of radius of being surveyed.

For example the RUM message among the EVDO comprises the pilot frequency intensity of a plurality of base station BSs.Therefore, the position that obtains portable terminal by signal strength signal intensity is possible.But because the impact of the randomness of multipath fading uses this position estimation method accuracy under urban environment lower.

3. time-based method: the time of advent (ToA) and the time of advent poor (TDoA)

The method is based on the ToA of the signal of estimating to be sent by terminal and receive at a plurality of BS or at the TDoA of a plurality of BS to the reference signal that receives.

In the ToA method, the distance between terminal and the BS was measured by the propagation time of finding the paths between terminal and the BS.Must to be in the center be on the circumference of distance between terminal and the BS at BS, radius to portable terminal on the geometry.If there are at least three BS to receive this terminal signaling, the position of MS provides by the common factor of three circles.

In the TDoA method, come to estimate terminal location by two above neighbor bss and the difference time of advent that receives signal with reference to BS with the difference of the time of advent.Since hyperbola be with the plane on the absolute value of difference of distance of two fixed points be the track of the point of definite value, if the known time of advent of this moment is poor, terminal track must be on the hyperbola of constant time difference of arrival of two BS, its focal length is at two BS places.If there are three BS to receive the signal of this terminal, then the base station can measure two time differences.Therefore the position of portable terminal is at two groups of hyp common factor places.Therefore need at least 3 paths to use the TOA/TDOA method.

For example comprised a plurality of pilot phase offset informations that measure from portable terminal in the RUM message among the EVDO, the base station demodulation chip also can obtain more accurate signal and arrive phase deviation, so the TDoA location method also is possible.

Especially, for the EVDO system, comprise a plurality of information relevant with the location in the RUM message, for example: reference pilot biasing, reference pilot intensity, and each non-reference pilot phase bias is non-reference pilot intensity etc.The base station can obtain TDoA with reference base station by decoding RUM.

Can be such as the operation of getting off: at first each BS calculates pilot offset separately according to the RUM message of receiving.Because in CDMA2000 and EVDO system, bit rate is per second 1.2288 million, the minimum interval of pilot offset is 64 sections (chip), and the length of each section is 244 meters, and time span was 813.8 nanoseconds.Optional pilot offset (totally 512) between 0 and 511 for reducing presence of intercell interference, is isolated by configuration pilot tone increment (PilotIncrement).If for example the pilot tone increment is 3, and PilotPNPhase is 237, then its PN biasing can for:

PilotPN＝floor[mod(PilotPNPhase+32＊PilotIncrement，512＊64)/(64＊PilotIncement)]＊PilotIncement (5)

Wherein floor is lower bracket function, and mod is the remainder function.After the substitution, can obtain PilotPN=3.

Known reference pilot tone (BS1) and non-reference pilot (BS2) phase bias, the distance of terminal and BS2 can be calculated as follows with the difference Diff (unit is chip) of the one-way propagation time of terminal and BS1:

Diff＝(PilotPNPhase-ReferencePilotPN＊64)-64＊(PilotPN-ReferencePilotPN)(6)

Wherein, ReferencePilotPN is the PN biasing (unit is 64chip) of reference pilot BS1, can carry in RUM message.PilotPNPhase then is the pilot frequency deviation (chip of unit) of non-reference pilot BS2.And PilotPN is calculated according to formula (5) by PilotPNPhase to get.This is on duty both can to have obtained range difference (unit rice) with 244, and it is poor that this time with each chip on duty (813.8 nanosecond) then obtains the time of advent, i.e. TDoA (unit second).

In like manner can calculate the distance of terminal and BS1 and the TDoA of terminal and BS3.

Therefore, find the solution the position that two hyp common factors can computing terminal.

4. the time of advent poor (TDoA) and round-trip delay (RTD) method

Because portable terminal is reported the pilot frequency intensity that it records, poor if two base stations can measure separately earliest arrival time and obtain the time of advent, the track of terminal is on the hyperbola with the constant time difference of the arrival of two BS, and its focal length is at two BS places.And one of them base station can calculate terminal to the time-delay of this base station (for example can by mobile phone for measuring to the PilotPNPhase ReferencePN*64 that deducts this base station configuration obtain, for some baseband chip, also can directly read transmission delay from baseband chip such as CSM5500, the CSM6800 of Qualcomm, CSM6850 etc.).The position of terminal is positioned at distance take BS as the center of circle, take terminal to BS on the circle of radius.By finding the solution the common factor of hyperbola and circle, position that can computing terminal.

Following illustration the example of certain the routing update message RUM in the EVDO network.In this message, terminal has measured three pilot tones, and the PN of reference pilot is biased to 424, and the reference PN phase place of other two pilot tones is 22247 and 228.By as can be known above, after these three base stations are received this message separately, namely can calculate according to the method for TDOA or RTD/TDOA the position of base station.

Usually, for the EVDO network, in case obtain RUM, a plurality of base stations can be by using a position that obtains portable terminal in above-mentioned at least 4 methods.The mode that it will be understood by those skilled in the art that any definite mobile terminal locations all can be applicable in the embodiments of the invention, and more than enumerating only is example and the specific implementation of non exhaustive embodiments of the invention.

In an embodiment of the present invention, in this step, the position information such as location factor, speed or the position influence factor of the pilot tone of concentrating for mobile terminal activating can also be calculated based on said method in the base station.

Next, in step 507, proceed to the decision-making of the location aided rebroadcast switching of target candidate residential quarter.

In an embodiment of the present invention, can implement in base station side the decision-making of the location aided rebroadcast switching of position-based information.

Fig. 6 illustration according to an embodiment of the invention at the flow chart of base station side in the auxiliary decision-making of switching of the basic enterprising line position of position judgment.As shown in Figure 6, at step S610, predict whether described portable terminal is in the zone line of the target candidate residential quarter in the described Active Set.

Fig. 7 illustration the flow chart that carries out the location aided rebroadcast switchover policy of the position-based factor according to an embodiment of the invention.As shown in Figure 7, in an embodiment of the present invention, can the position-based factor predict by following operation whether portable terminal is in the zone line of the target candidate residential quarter in the Active Set:

At step S710, can predict the afterwards position of portable terminal of predetermined residence time.For example, can suppose that portable terminal is linear uniform motion, then can determine primary importance L1 and the second place L2 of the portable terminal of certain hour interval T, then can calculate according to as above formula (2) speed of this portable terminal.Then, can predict according to formula (3) the 3rd position L3 of portable terminal after predetermined residence time.

At step S720, knowing the relative distance that to determine portable terminal and target candidate residential quarter after this residence time on the basis of position.This can obtain according to the Euclidean distance formula.

Afterwards, at step S730, determine based on this relative distance whether described portable terminal is in the zone line of target candidate residential quarter after predetermined residence time.For example can determine location factor L for the portable terminal of this target candidate residential quarter according to formula (1) _fIf this location factor, determines then that this portable terminal is in beyond the fringe region or cell coverage area of this target candidate residential quarter greater than predetermined threshold; Otherwise, determine that this portable terminal is in the zone line of this target candidate residential quarter.Thereby can determine based on aforesaid operations the target candidate residential quarter of more suitable switching.

Fig. 8 illustration according to an embodiment of the invention based on the flow chart that carries out the location aided rebroadcast switchover policy of speed.As shown in Figure 8, in an embodiment of the present invention, can also predict by following operation whether portable terminal is in the zone line of the target candidate residential quarter in the Active Set based on speed:

At step S810, determine the position of portable terminal.In an embodiment of the present invention, can come as mentioned above to determine the position of portable terminal.Afterwards, at step S820, can as on calculate the speed V of portable terminal.Next, at step S830, the ratio of the predetermined residence time of the diameter of this speed V and this target candidate residential quarter and this residential quarter (can be minimum residence time) relatively.

At last, at step S840, the result determines whether portable terminal is in the zone line of target candidate residential quarter after predetermined residence time based on the comparison.In an embodiment of the present invention, for example, if V＞2R/m, then after predetermined residence time, this portable terminal will leave this target candidate residential quarter, perhaps be in the edge of this residential quarter.Can avoid like this switching to this target candidate residential quarter (for example Microcell).Otherwise, can determine that this portable terminal will be in the zone line of this target candidate residential quarter.Thereby can determine the target candidate residential quarter of more suitable switching.

Turn back to now Fig. 6, at step S620, until the target complete candidate cell in the Active Set has all been carried out aforesaid operations, be in the subset of it in the middle of the target candidate residential quarter in zone to determine prediction for the operation of next the target candidate residential quarter repeating step S610 in the Active Set.In an embodiment of the present invention, can identify the target candidate residential quarter by pilot offset (for example PN_offset).Thereby can filter out by the zone line whether the prediction portable terminal is in this target candidate residential quarter some the target candidate residential quarter in the Active Set that not too is fit to switch.

Afterwards, at step S630, determine whether the subset of this target candidate residential quarter is empty.If be not empty, then proceed to step S640.

At step S640, for the target candidate residential quarter in this subset, compare its pilot frequency intensity.In an embodiment of the present invention, can compare signal to noise ratio SINR.

At last, at step S650, the switching of decision-making from described former Serving cell to the target switching cell.In an embodiment of the present invention, can signal to noise ratio be the selected Target cell that switches of criterion to the maximum, namely switch to and have the target candidate residential quarter of strong pilot frequency intensity.

In an embodiment of the present invention, if the subset of this target candidate residential quarter is empty, in any target candidate residential quarter that to be portable terminal be not in after predetermined residence time in the Active Set, then proceed to step S660, in this step, can determine whether it is in the zone line of former Serving cell.In an embodiment of the present invention, similarly, can determine according to formula (1) location factor of this portable terminal, and the size of the comparison position factor and predetermined threshold determines whether portable terminal is in the zone line of former Serving cell.

If be no, namely the position factor is greater than predetermined threshold, and then at step S670, the decision-making portable terminal will proceed to the switching of target candidate residential quarter.This also can be the selected switching target small area of criterion to the maximum with signal to noise ratio.In an embodiment of the present invention, can determine to have the target candidate residential quarter of strong pilot frequency intensity according to the pilot frequency intensity of all the target candidate residential quarters in the Active Set.Thereby decision-making switches to this has the target candidate residential quarter of strong pilot frequency intensity.

If be yes, then do not switch, finish in step S680 handover decisions process.

In an embodiment of the present invention, can also carry out the decision-making that location aided rebroadcast switches by the position-based factor of influence.In an embodiment of the present invention, can determine the position influence factor based on the positional information of described portable terminal for the described target candidate residential quarter in the Active Set, the described position influence factor has characterized the position of portable terminal to the influence degree of pilot frequency intensity; Relatively the pilot frequency intensity of each target candidate residential quarter and the position influence factor is poor; Decision-making switches to the target candidate residential quarter of the difference with maximum pilot frequency intensity and position influence factor.

Fig. 9 illustration carry out according to an embodiment of the invention the flow chart of the decision-making that location aided rebroadcast switches at base station side position-based factor of influence.As shown in Figure 9, at step S910, determine its position influence factor for each target candidate residential quarter in the Active Set.As mentioned above, by location factor is quantized, determine the position influence factor.

At step S920, make up former pilot frequency intensity and the position influence factor, obtain the comprehensive pilot frequency intensity of each candidate target cells.In an embodiment of the present invention, this parameter can be SINR-PositionAdjust.In an embodiment of the present invention, it is also conceivable that the situation of load, if consider simultaneously situation and the loading condition of the terminal of network, then can obtain comprehensive pilot frequency intensity is SINR-LoadingAdjust-PositionAdjust.Standardization of the EVDO network optimization based on load balancing, usually LoadingAdjust can adopt forward direction non-empty queue number to characterize (after for example taking the logarithm, unit is dB), specifically see also 3GPP2C.S0024-Cv1.0, its full content is incorporated herein by reference.

At last, at step S930, carry out the decision-making that location aided rebroadcast switches.In an embodiment of the present invention, can be the selected switching target small area of criterion to the maximum with comprehensive pilot frequency intensity.Switch as Target cell by the target candidate residential quarter of selecting in the comprehensive signal to noise ratio of each target candidate residential quarter from Active Set to have maximum comprehensive signal to noise ratio.

At last, turn back to Fig. 5, at step S509, finish this process.

In an embodiment of the present invention, the base station can indicate whether portable terminal is switched by the switching indication parameter is set.For example in the EVDO system, the base station can determine whether by the value that DRCLock is set portable terminal is switched.If the DRCLock of target BS is made as 1, then expression allows to switch to this target BS.If the DRCLock of target BS is made as 0, then expression does not allow to switch to this target BS.

In an embodiment of the present invention, can also carry out the auxiliary handover decisions of portable terminal.As mentioned above, can determine its position influence factor for each target candidate residential quarter in the Active Set in base station side, this position influence factor position-based factor and generating.This position influence factor characterizes the degree of location-based adjustment to pilot frequency intensity, therefore also can be described as in an embodiment of the present invention the pilot frequency intensity adjustment information.Can send the message that comprises for the pilot frequency intensity adjustment information of each target candidate residential quarter the Active Set from the base station to portable terminal in an embodiment of the present invention, with the notice portable terminal.

In an embodiment of the present invention, also provide a kind of method for portable terminal being switched to Target cell, this Target cell can be Microcell.The method can comprise: receive at described portable terminal place from the base station, pointer is to the message of the location-based pilot frequency intensity adjustment information of the target candidate residential quarter in the Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity; And based on the switching of the described portable terminal decision-making of described pilot frequency intensity adjustment information from described former Serving cell to the target candidate residential quarter.

In an embodiment of the present invention, can be criterion to the maximum with comprehensive pilot frequency intensity like the Decision Classes of this switching and determine switching target small area, thereby switch to the target candidate switching cell with maximum comprehensive pilot frequency intensity from former Serving cell.

In the situation that only consider position influence, in an embodiment of the present invention, comprehensive pilot frequency intensity (being also referred to as comprehensive pilot frequency intensity parameter) can be SINR-PositionAdjust.In an embodiment of the present invention, it is also conceivable that the situation of load, consider at the same time situation and the loading condition of the terminal of network, comprehensive pilot frequency intensity parameter can be SINR-LoadingAdjust-PositionAdjust.The processing of this and base station side is similar, does not repeat them here.

In an embodiment of the present invention, can utilize the LoadInformation message in the EVDO system to carry the pilot frequency intensity adjustment information, to transmit positional information to portable terminal, carry out handover decisions.

As shown in Table 1, broadcast load information is come by Loadinformation message in the base station.The structure of this message is shown in following table one, referring to 3GPP2C.S0024-Cv1.0:

Table one

Wherein:

In the MessageID field, it is 0x02 that the base station can arrange this field.

In the LoadingAdjust field, it is that unit is that the unsigned number of 0.5dB is to represent the adjustment of load of this sector that the base station can arrange this field.In an embodiment of the present invention, in order to carry positional information, it is LoadingAdjust+PositionAdjust that the base station can arrange this field, and wherein PositionAdjust is the result's (dB of unit) (for example position influence factor) after location factor is quantized.

In the NeighborCount field, the base station can arrange this field and be the number of the adjacent sectors in this message.

In the NeighborSectorLoadingAdjust field, the base station can arrange this field and be adjustment of load corresponding with adjacent sectors, that unsigned number that unit is 0.5dB represents this sector.In an embodiment of the present invention, in order to carry positional information, it is NeighborSectorLoadingAdj ust+NeighborSectorPositionAdjust that the base station can arrange this field, wherein NeighborSectorPositionAdjust is the result (for example, the dB of unit) after the location factor of adjacent sectors is quantized.The order of NeighborSectorLoadingAdjust field is identical with adjacent sectors sequence of information in the SectorParameters message.

In the Reserved field, it is 0 that the base station can arrange this reserved field.Portable terminal can be ignored this field.

In an embodiment of the present invention, portable terminal can measure E _c/ I _o, so the comprehensive pilot frequency intensity parameter of each target candidate residential quarter in the Active Set is easily determined.Thereby can determine that the Target cell that switches comes the auxiliary switching of executing location at mobile terminal side.

The below illustrates the flow process according to the auxiliary location aided rebroadcast handover decisions of the execution portable terminal of communication system of the present invention as an example of the EVDO environment example.As shown in figure 10, at step S101, the trigger event triggering mobile terminals occurs carry out measure and transmit message.

In an embodiment of the present invention, the auxiliary handover mechanism of position-based information can be operated in activation switching or the switching of free time in.But more meaningful for the switching that activates.In the switching that activates, the base station will be received the RUM of portable terminal more continually.In certain embodiments, the base station will periodically send triggering message, and for example the base station is triggered travelling carriage and sent RUM message by sending RUM request message or having the AttributeOverride message of the pilot threshold of modification.

At step S102, after receiving these triggering message, portable terminal will be with the RUM message response.As implied above, in RUM message, comprised a plurality of pilot frequency deviation information that detect from portable terminal, therefore, this message can be used for location-based service.

At step S103, base station decodes RUM message, record Ec/Io, and utilize two the nearest RUM message that receive recently to obtain the position of portable terminal by one of above-mentioned technology, and the pilot tone in the Active Set of portable terminal is calculated the position information such as location factor, speed or the position influence factor of portable terminal.In an embodiment of the present invention, if define portable terminal that a mechanism makes activation for example sent the cycle in 2 seconds every the scheduled time RUM, then the base station can be after using RUM message to obtain the position of portable terminal the motion track of tracking mobile terminal.As mentioned above, by two continuous RUM message, the base station can obtain speed and the direction of portable terminal.

At step S104, the position after the predetermined residence time of base station prediction.In an embodiment of the present invention, this can be by said method for example

Realize.

At S105, can also determine location factor, speed or the position influence factor etc. in the L3 position for each target candidate residential quarter in the Active Set.The location factor of L3 position is carried out quantification take dB as unit, get final product to get the position influence factor.Can quantize according to as above method.In an embodiment of the present invention, can adopt the mode that can quantize arbitrarily location factor.

At step S106, the base station can arrange the pilot frequency intensity adjustment information in Loadinformation message, and broadcasts this Loadinformation message to portable terminal.

At step S107, portable terminal receives this message, extracts the pilot frequency intensity adjustment information of each target candidate residential quarter in the Active Set, carries out handover decisions based on this pilot frequency intensity adjustment information.In an embodiment of the present invention, the foundation of decision-making can be that comprehensive pilot frequency intensity is maximum such as SINR-LoadingAdjust-PositionAdjust or SINR-PositionAdjust.

Under same idea of the present invention, a kind of base station is provided, it can the auxiliary handover decisions of enforcing location.In an embodiment of the present invention, this base station can comprise: determining unit, for the position of determining portable terminal; Computing unit is for the positional information that comprises location factor, speed or the position influence factor of calculating described portable terminal; And decision package, be used for the switching to described target candidate residential quarter of assisting with reference to the pilot frequency intensity decision-making position-based of the target candidate residential quarter of described Active Set based on the positional information of described portable terminal.

In an embodiment of the present invention, described computing unit can be implemented such as the part or all of operation among Fig. 5-10, such as determining whether described portable terminal is in the zone line of target candidate residential quarter, determines the position influence factor etc. for the described target candidate residential quarter in the Active Set based on the positional information of described portable terminal after predetermined residence time.

Figure 11 illustration according to the structured flowchart of the base station 100 of the enforcement handover decisions of the embodiment of the invention.Device 100 (particularly processors) can be configured to realize above general described operation and function, such as the control of calling out and the processing such as control of switching.In addition, device 100 (particularly processors) can be configured to carry out described some or all operations about Fig. 5-10.

Similarly, device 100 can comprise processor, memory devices and communication interface or communicate with.Similar to the above, processor can be embodied as various devices, for example comprise microprocessor, coprocessor, controller or comprise various other treatment facilities of integrated circuit (for example ASIC (application-specific integrated circuit (ASIC)), FPGA (field programmable gate array) or hardware accelerator).About the processor as FPGA, ASIC etc., this processor can be the hardware that is configured to carry out the operation of processor described here especially.In the exemplary embodiment, processor is configured to carry out instruction or the addressable instruction of processor of storing in memory devices.

In one exemplary embodiment, one or more processes described here can realize by the computer program that comprises code instructions.Thus, realize the memory device for storing that the code instructions of process described here can be by device (for example installing 100 and/or 200) or be stored thereon, and carry out by processor.Can understand, such code instructions can be loaded on computer, processor or other programmable devices (for example processor, memory devices) arbitrarily, to generate machine, it comprises the device for the function of the square frame of realization flow figure, step or operation appointment.In some exemplary embodiments, these code instructions also are stored in the computer-readable recording medium, its instruct computer, processor or other programmable devices are to move by ad hoc fashion, thereby the instruction of storing in the computer-readable recording medium generates goods, and it also provides the device of the function of appointment in square frame, step or the operation of realization flow figure.Code instructions also can be loaded on computer, processor or other programmable devices, on computer, processor or other programmable devices or by it, to carry out the sequence of operations step, generating computer implemented processing, thereby provide the step of the function of appointment in square frame, step or the operation of realization flow figure in the instruction that computer, processor or other programmable devices are carried out.

In an embodiment of the present invention, as shown in figure 11, base station 100 can comprise: determining unit 102, for the position of determining portable terminal; Computing unit 104 is for the positional information that comprises location factor or speed of calculating described portable terminal; And decision package 106, be used for the switching to described target candidate residential quarter of assisting with reference to the pilot frequency intensity decision-making position-based of the target candidate residential quarter of described Active Set based on the positional information of described portable terminal.

In an embodiment of the present invention, the described computing unit 104 original position factor that also can be configured to calculate described portable terminal is to determine whether described portable terminal is in beyond the fringe region or this cell coverage area of source Serving cell.

Preferably, described computing unit 104 is configured to also to predict whether after predetermined service time described portable terminal is in the zone line of target candidate residential quarter.In an embodiment of the present invention, whether described computing unit 104 size that can be configured to the ratio of more described speed and cell diameter and predetermined service time is in the zone line of target candidate residential quarter with prediction described portable terminal after predetermined service time.

Figure 12 illustrates that each embodiment is arranged to the exemplary portable terminal 200 that carries out handover decisions in communication network according to the present invention.Device 200 (particularly processors) can be configured to realize above general described operation and function, for example measurement and the report of communication, signal quality.In addition, device 200 (particularly processors) can be configured to carry out described some or all operations about Fig. 5-10.

In some exemplary embodiments, device 200 can be embodied as, or is included as computing equipment with wireless communication ability and/or the assembly of communication equipment.Device some example of 200 comprises computer, server, portable terminal (such as mobile phone, portable digital-assistant (PDA), beep-pager, mobile TV, game station, mobile computer, laptop computer, camera, video recorder, audio/video player, radio and/or global positioning system (GPS) equipment) or above-mentioned combination in any etc.In addition, device 200 can be configured to realize various aspects of the present invention described here, each illustrative methods of the present invention for example, wherein said method can be by configure hardware and/or software, firmware or its combination the realizations such as processor (such as processor), computer-readable medium.

Device 200 can comprise processor, memory devices and communication interface or communicate with.In addition, processor can be embodied as various devices, for example comprise microprocessor, coprocessor, controller or comprise various other treatment facilities of integrated circuit (for example ASIC (application-specific integrated circuit (ASIC)), FPGA (field programmable gate array) or hardware accelerator).About the processor as FPGA, ASIC etc., this processor can be the hardware that is configured to carry out the operation of processor described here especially.In the exemplary embodiment, processor is configured to carry out instruction or the addressable instruction of processor of storing in memory devices.Processor for example can be configured to be convenient to by the control hardware that comprises in the control communication interface and/or software via communication interface communication.

Memory devices can be configured to be stored in each information that relates in the realization embodiments of the invention.Memory devices can be computer-readable recording medium, can comprise volatibility and/or nonvolatile memory.For example, memory devices can comprise on random access memory (RAM) (comprise dynamically and/or static RAM (SRAM)), the sheet or cache memory and/or other under the sheet.In addition, memory devices can comprise nonvolatile memory, it can be embedded into and/or be removable, and can comprise such as read-only memory, flash memory, magnetic storage apparatus (such as hard disk, floppy disk, tape etc.), CD drive and/or medium, nonvolatile RAM (NVRAM) and/or other.Memory devices can comprise the cache memory section for temporary storaging data.Thus, some or all of memory devices can be included in the processor.

In addition, memory devices can be configured to storage information, data, application, computer readable program code instruction etc., is used for so that each function of processor and device 200 executive basis exemplary embodiment of the present.For example, memory devices can be configured to buffering input data to process for the treatment of device.In addition, or alternatively, memory devices can be configured to store the instruction of being carried out by processor.

Communication interface can be any apparatus or the device of realizing with the combination of hardware, computer program or hardware and software, and it is configured to from the network of communicating by letter with device and/or arbitrarily other equipment or module receive data and/or to its transmission data.Thus, communication interface for example can comprise, antenna, reflector, receiver, transceiver and/or support hardware comprise for processor or the computer program of support with network service.

Communication interface can be configured to provide communication according to any wireless communication standard.For example, communication interface can be configured to provide communication according to following standard: the second generation (2G) wireless communication protocol IS-136 (time division multiple access (TDMA)), GSM (global system for mobile communications), IS-95 (code division multiple access (CDMA)), the third generation (3G) wireless communication protocol (Universal Mobile Telecommunications System (UMTS) for example, CDMA2000, wideband CDMA (WCDMA) and time-division synchronization CDMA (TD-SCDMA)), 3.9 for (3.9G) wireless communication protocol (for example evolved universal terrestrial radio access network (E-UTRAN)), the 4th generation (4G) wireless communication protocol, international mobile telecommunication senior (IMT-Advanced) agreement, Long Term Evolution (LTE) agreement (comprising LTE-Advanced) etc.

In an embodiment of the present invention, user terminal 200 as shown in figure 12 can comprise: receiving element 202, be used for to receive from the pointer of the base station message to the location-based pilot frequency intensity adjustment information of the target candidate residential quarter of Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity; Resolution unit 204 is used for from the location-based pilot frequency intensity adjustment information of described message extraction for the target candidate residential quarter the Active Set; Decision package 206 is used for based on the switching of described pilot frequency intensity adjustment information decision-making to described target candidate residential quarter.It can be configured to carry out some or all step or operation such as Fig. 5-10.

Obviously, by introducing in embodiments of the present invention the location aided rebroadcast handover mechanism, the possible frequent switching problem of exempting or having suppressed to be caused by the little or high mobility of Microcell covering radius too much switches the cutting off rate that causes thereby reduce, and has improved user's experience.In addition, by this mechanism, high speed mobile terminal will have more multimachine can be served by macrocell, and the low speed portable terminal will more may be served by Microcell, has realized the load balancing based on speed.And the mobility information that proposes in embodiments of the present invention also can be used for many location-based application.In addition, the location factor of proposition can also strengthen utilization by other EVDO, such as Intelligent carrier management, distributed network scheduling (DNS) etc.Therefore, the changing method of location aided rebroadcast is very useful for picocell deployment and high mobility equipment.

Although it should be appreciated by those skilled in the art that the embodiments of the invention that are illustrated in as an example in this manual under the 3G background of using EVDO, also can in other suitable systems, use the handover mechanism of embodiments of the invention.

In an embodiment of the present invention, the square frame of flow chart, step or operation support be used for carrying out the device of specific function combination, be used for carrying out the step of specific function combination, be used for carrying out the code instructions of specific function.Also can understand, in some exemplary embodiments, the combination of the square frame in one or more square frames of flow chart, step or operation and the flow chart, step or operation is by carrying out realizing based on the computer system of specialized hardware or the combination of processor or specialized hardware and code instructions of specific function or step.

Of the present invention many modifications of setting forth here and other embodiment will be so that the instruction that provides in above specification and relevant drawings be provided those skilled in the art related to the present invention.Therefore, can understand, the invention is not restricted to disclosed specific embodiment, and revise with other embodiment and be intended to comprise within the scope of the appended claims.In addition, although above specification and relevant drawings have been described the exemplary embodiment in the environment of certain example combinations of parts and/or function, it should be understood that, the various combination of parts and/or function can provide by alternative, and does not break away from the scope of claims.Thus, for example, as in some claims, set forth those, also can imagine their various combination except above clear and definite described those parts and/or function.Although the particular term that adopts here, they are not the purpose for restriction only as generality and descriptive sense.

Claims (12)

1. method that is used for portable terminal is switched to Target cell comprises:

Determine the positional information of portable terminal for each target candidate residential quarter in the Active Set at the place, base station; And

Based on the positional information of described portable terminal with reference to the make a strategic decision switching of described target candidate residential quarter of the pilot frequency intensity of the target candidate residential quarter in the described Active Set.

2. the method for claim 1, wherein said decision-making further comprises to the switch step of described target candidate residential quarter:

Predict whether described portable terminal is in the zone line of the target candidate residential quarter in the described Active Set;

Be in the zone line of described target candidate residential quarter if predict described portable terminal, then comparison prediction is in the pilot frequency intensity of the described target candidate residential quarter in its middle zone; And

Based on the pilot frequency intensity of described target candidate residential quarter, decision-making is from described former Serving cell to having the switching of the target candidate residential quarter of strong pilot frequency intensity.

3. method as claimed in claim 2, predict that wherein the step whether described portable terminal is in the zone line of target candidate residential quarter further comprises:

The position of prediction described portable terminal after predetermined residence time;

Determine the relative position of described portable terminal and target candidate residential quarter after described residence time; And

Whether after predetermined residence time, be in the zone line of target candidate residential quarter based on the described portable terminal of this Relative position determination.

4. method as claimed in claim 3, determine that wherein the step of the relative position of described portable terminal and target candidate residential quarter further comprises:

Determine the relative position of described portable terminal and target candidate residential quarter based on following equation:

L _f＝L/R

Wherein, L _fBe location factor, L is the relative distance of described portable terminal and base station, and R is the radius of target candidate residential quarter.

5. method as claimed in claim 2, predict that wherein the step whether described portable terminal is in the zone line of target candidate residential quarter further comprises:

Determine the position of described portable terminal;

Calculate the speed of described portable terminal;

The ratio of the diameter of more described speed and described target candidate residential quarter and the predetermined residence time of this residential quarter; And

Determine based on described comparative result whether described portable terminal is in the zone line of target candidate residential quarter after predetermined residence time.

6. such as each described method among the claim 3-5, whether wherein said definite described portable terminal is in the zone line of target candidate residential quarter after predetermined residence time step further comprises:

If described location factor greater than above-mentioned ratio, determines then that described portable terminal is in beyond the fringe region or cell coverage area of described target candidate residential quarter greater than predetermined threshold or described speed;

Otherwise, determine that described portable terminal is in the zone line of described target candidate residential quarter.

7. the method for claim 1, wherein said decision-making further comprises to the switch step of described target candidate residential quarter:

Determine the position influence factor for the described target candidate residential quarter in the Active Set based on the positional information of described portable terminal, the described position influence factor has characterized the position of portable terminal to the influence degree of pilot frequency intensity;

Relatively the pilot frequency intensity of each target candidate residential quarter and the position influence factor is poor;

Decision-making switches to the target candidate residential quarter of the difference with maximum pilot frequency intensity and position influence factor.

8. the method for claim 1 wherein also comprises:

Send the message that comprises for the location-based pilot frequency intensity adjustment information of the described portable terminal of the target candidate residential quarter in the Active Set at base station place to described portable terminal, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal.

9. method that is used for portable terminal is switched to Target cell comprises:

Receive at described portable terminal place from the base station, pointer is to the message of the location-based pilot frequency intensity adjustment information of the target candidate residential quarter in the Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity;

Based on the switching of the described portable terminal decision-making of described pilot frequency intensity adjustment information from described former Serving cell to the target candidate residential quarter

10. base station comprises:

Determining unit is for the position of determining portable terminal;

Computing unit is for the positional information that comprises location factor or speed of calculating described portable terminal; And

Decision package is used for based on the positional information of described portable terminal with reference to the make a strategic decision switching of described target candidate residential quarter of the pilot frequency intensity of the target candidate residential quarter of described Active Set.

11. a portable terminal comprises:

Receiving element, be used for to receive from the pointer of the base station message to the location-based pilot frequency intensity adjustment information of the target candidate residential quarter of Active Set, wherein said pilot frequency intensity adjustment information generates based on the positional information of described portable terminal, has characterized the position of portable terminal to the influence degree of pilot frequency intensity;

Resolution unit is used for from the location-based pilot frequency intensity adjustment information of described message extraction for the target candidate residential quarter the Active Set;

Decision package is used for based on the switching of described pilot frequency intensity adjustment information decision-making to described target candidate residential quarter.

12. a computer program, it has computer-readable instruction, when its when computing equipment moves, be configured to carry out such as the described method of claim 1-9.

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