CN101998555A - Method and system for cell reselection - Google Patents

Method and system for cell reselection Download PDF

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CN101998555A
CN101998555A CN2009101627387A CN200910162738A CN101998555A CN 101998555 A CN101998555 A CN 101998555A CN 2009101627387 A CN2009101627387 A CN 2009101627387A CN 200910162738 A CN200910162738 A CN 200910162738A CN 101998555 A CN101998555 A CN 101998555A
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translational speed
sub
rnc
district
cell
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CN101998555B (en
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朱昀
谢玉堂
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SUZHOU DACHENG YOUFANG DATA TECHNOLOGY Co.,Ltd.
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ZTE Corp
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Abstract

The invention discloses a method for cell reselection, comprising the following steps that: a base station (Node B) is used for measuring the moving speed of a user terminal (User Equipment) in a cell covered by the base station (Node B) and reporting the moving speed to a radio network controller (RNC); the RNC is used for setting cell reselection parameters of the UE according to the reported moving speed of the UE and transmitting the parameters to all UE in the cell through the Node B; and the UE is used for measuring the cell according to the received parameters and executing the cell reselection according to a measuring result. The invention also discloses a system for cell reselection, solving the problem that the traditional cell reselection method can not be better suitable for the specific scenes similar to high-speed rail lines.

Description

A kind of method of cell reselection and system
Technical field
The present invention relates to the cell reselection technique in the mobile communication, relate in particular to a kind of method of cell reselection and system.
Background technology
Modern Mobile Communications Systems normally is based upon on the beehive net mode, so-called beehive net mode, promptly by many regular hexagons sub-district as base unit, combination covers the full wafer service area, thereby constitutes the mobile radio communication of the similar honeycomb of shape.User terminal (UE, User Equipment) is in a sub-district and couple together by radio channel between the network equipment, and along with the moving of UE, and realizes handover and stride the function of local network automatic roaming between neighbor cell.
With the 3-G (Generation Three mobile communication system) is example, its wireless access network is made of a plurality of RNSs, each RNS includes a radio network controller (RNC, Radio NetworkController), a plurality of base stations (NodeB) and a large amount of UE.When UE when a sub-district moves to another sub-district, cause sub-district gravity treatment or switching.The difference that switch sub-district gravity treatment and sub-district is: when not having to set up good dedicated channel (being also referred to as UE under idle pulley), when UE moves to another sub-district from a sub-district, cause sub-district gravity treatment (cell reselection); When establishing dedicated channel (being also referred to as UE under connection mode), when UE moves to another sub-district from a sub-district, cause and switch (Handover).
UE realizes that the process of sub-district gravity treatment is as follows: when inserting current service cell (or abbreviating Serving cell as), UE is from the broadcast channel (BCH of this sub-district, Broadcast Channel) goes up receiving system message (SIB, and from SIB, obtain and tabulate with this neighboring cell (being called neighbor cell) and required threshold parameter and timer parameter when carrying out the sub-district gravity treatment System Information Block); UE periodically measures the received signal intensity of current service cell, and is finding that measurement result is lower than when determining threshold value, and UE begins the received signal intensity of neighbor cell is measured; If the received signal intensity of finding certain neighbor cell is greater than the threshold value that satisfies resident condition, and the grade point of this sub-district is higher than Serving cell, and this sub-district becomes the sub-district of satisfying reselection conditions so; Choosing the highest sub-district of grade point from all satisfy the sub-district of reselection conditions becomes optimal target re-selecting cell, if this sub-district can be at timer time T ReselectIn remain the most suitable, then the UE gravity treatment is to this sub-district.
In the prior art, the parameter that the sub-district gravity treatment is required, all be provided with and send to UE such as the parameter of threshold parameter, calculation plot grade point, neighbor cell list etc., and the value of these parameters all is to get a fixed value according to engineering staff's experience by RNC.
The process of sub-district gravity treatment can be divided into the two kind situations of UE under low speed and high-speed motion state again, and both differences are timer time T ReselectValue: for UE under the low-speed motion state, T ReselectGet a bigger constant value, that is to say that the target re-selecting cell need keep the most suitable of long period could be by gravity treatment; For UE under high-speed motion state, T ReselectGet a less constant value, that is to say that the target re-selecting cell need keep the most suitable of short period just can be by gravity treatment.And judge that the foundation that UE is in low speed and high-speed motion state is: judge the timer T of UE before current time CR maxWhether the number of times that the sub-district gravity treatment took place in the time surpasses the thresholding times N of setting CRIf, surpass, think that then UE is under the high-speed motion state; Otherwise, think that UE is under the low-speed motion state.
Yet, in being similar to high-speed railway shown in Figure 1 some reality scenes along the line, adopt prior art to realize that there is the inaccurate problem of judgement UE motion state in sub-district gravity treatment meeting: because prior art is judged the foundation of the motion state of UE is the number of times that the sub-district gravity treatment takes place in the long period section of UE before current time, that is to say that this judgement lags behind, but not instantaneous value, especially when the stage of bullet train in acceleration or brake, such judgement often has very big error; Further, with the T that error is arranged ReselectInfluence the sub-district gravity treatment, may cause UE to miss the best opportunity of sub-district gravity treatment, or the situation of UE gravity treatment back and forth (being called ping-pong) in the minizone takes place.
And RNC is when being provided with the desired parameters (such as the received signal threshold value, the several parameters of calculation plot grade point) that above-mentioned UE carries out the sub-district gravity treatment, and RNC is arranged to fixed value with these parameters in the prior art.So just make the shortage flexibility is set, lack support the high speed scene.
In sum, adopt prior art to come cell reselection parameters is provided with and carries out method of cell reselection thereupon, can not be applicable to similar high-speed railway such special scenes along the line preferably, thus to actual arrange net to use make troubles.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and radio network controller (RNC) that cell reselection parameters is set, and cell reselection parameters is provided with the problem that shortage is supported the high speed scene in the prior art to solve.
Accordingly, another object of the present invention is to provide a kind of method of cell reselection and system, can not better be applicable to problem under similar high-speed railway such special scenes along the line to solve existing residence reselecting.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of cell reselection, this method comprises:
Base station (NodeB) measures the translational speed of user terminal (UE) in its coverage cell and reports radio network controller (RNC);
Described RNC is provided with the parameter that UE carries out the sub-district gravity treatment according to the translational speed of the UE that NodeB reports, and the parameter that is provided with is sent to all UE in the sub-district by NodeB;
UE measures the sub-district according to the parameter that receives, and carries out the sub-district gravity treatment according to measurement result.
Described RNC is arranged in the following cell reselection parameters at least one to have functional relation with the translational speed of UE: the first timer time T 1With the second timer time T Reselect
Described RNC is provided with the second timer time T ReselectIncrease with the translational speed of UE reduces.
Described RNC is by linear function, or piecewise function, or multiply by and dwindle factor pair T ReselectBe provided with.
Described RNC is arranged in the following cell reselection parameters at least one to have functional relation with the translational speed of UE: in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point Offsets
This method further comprises: described RNC is provided with Q HystIncrease with the translational speed of UE reduces, and Q is set OffsetsIncrease with the translational speed of UE reduces.
Described RNC by linear function or piecewise function to Q HystAnd Q OffsetsIn at least one be provided with.
For the sub-district of hierarchical network architecture, described RNC is with offset parameter TO between level nBe arranged to have functional relation with the translational speed of UE, and, TO is set nIncrease with the translational speed of UE reduces.
Described RNC is by linear function, or piecewise function, or multiply by and dwindle factor pair TO nBe provided with.
For the sub-district that high-speed railway or highway adopt hierarchical network architecture cloth net mode along the line, described RNC is with the level priority (HCS_PRIO of private network sub-district along the line 1) be arranged to low value, with the level priority (HCS_PRIO of public network cell 2) be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
UE is according to T 1Execution is specially the measurement of sub-district: described UE is at T 1Timing then, to the received signal strength S of current service cell xMeasure, with described S xCompare with default measurement triggering thresholding S, and at S xDuring≤S,, the received signal intensity of the neighbor cell in the described neighbor cell list is measured according to the neighbor cell list that RNC sends;
Perhaps, described UE is at T 1Before timing time arrives, with the received signal strength S of long time cycle to current service cell xMeasure; At T 1Timing time then, with the received signal strength S of short time cycle to current service cell xMeasure; With described S xCompare with default measurement triggering thresholding S, and at S xDuring≤S,, the received signal intensity of the neighbor cell in the described neighbor cell list is measured according to the neighbor cell list that RNC sends.
This method further comprises:
Described RNC is with the T that is provided with 1Send to UE, described UE is according to the T that receives 1Execution is to the measurement of sub-district;
Perhaps, described RNC is not with the T that is provided with 1Send to UE, described RNC is according to T 1Carry out timing, and trigger the measurement of described UE execution the sub-district.
Described RNC is provided with UE according to the translational speed of UE and carries out the required parameter of sub-district gravity treatment, further comprise: receiving the translational speed of a plurality of UE that NodeB reports as described RNC after, get the assembly average of a plurality of translational speeds that report, and UE is set carries out the required parameter of sub-district gravity treatment according to described assembly average.
The present invention also provides the system of a kind of sub-district gravity treatment, and this system comprises: NodeB, RNC and UE, wherein,
Described NodeB is used to measure the translational speed of UE in its coverage cell and report described RNC;
Described RNC, the translational speed that is used for the UE that reports according to NodeB is provided with the parameter that UE carries out the sub-district gravity treatment, and the parameter that is provided with is sent to all UE in the sub-district by NodeB;
Described UE is used for according to the parameter that receives the sub-district being measured, and carries out the sub-district gravity treatment according to measurement result.
Described RNC is further used for, and in the following cell reselection parameters at least one is arranged to have functional relation with the translational speed of UE: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point Offsets
Described RNC is further used for, with offset parameter TO between level nBe arranged to have functional relation with the translational speed of UE, and TO nBe arranged to reduce with the increase of the translational speed of UE.
Adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, described RNC is further used for, with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
Described UE is further used for, and under the situation of the level priority of level priority (HCS_PRIO) that does not receive current service cell or adjacent area, the level priority with the adjacent area of described UE acquiescence is arranged to identical with service area.
The present invention also provides a kind of method that cell reselection parameters is set, and this method comprises:
The translational speed of the UE that described RNC reception NodeB reports;
Described RNC is arranged in the following parameter at least one to have functional relation with the translational speed of UE according to the translational speed of the UE that receives: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, in order to calculate the offset parameter Q of neighbor cell grade point Offsets
This method further comprises: described RNC is provided with Q HystIncrease with the translational speed of UE reduces.
This method further comprises: described RNC is provided with Q OffsetsIncrease with the translational speed of UE reduces.
This method further comprises: described RNC is provided with T ReselectIncrease with the translational speed of UE reduces.
Described RNC by linear function or piecewise function to T 1, T Reselect, Q Hyst, Q OffsetsIn at least one be provided with.
For the hierarchical network architecture network, this method further comprises: described RNC according to the translational speed of the UE that receives with offset parameter TO between level nBe arranged to have functional relation, and TO is set with the translational speed of UE nIncrease with the translational speed of UE reduces.
Adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, this method further comprises: described RNC is with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
The present invention also provides a kind of RNC, comprising:
Receiver module is used to receive the translational speed of the UE that NodeB reports;
Parameter is provided with module, is used for being arranged to have functional relation with the translational speed of UE according at least one with following parameter of the translational speed of the UE that receives: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, in order to calculate the offset parameter Q of neighbor cell grade point Offsets
Described parameter is provided with module and is further used for, and Q is set HystIncrease with the translational speed of UE reduces, and/or Q is set OffsetsIncrease with the translational speed of UE reduces, and/or T is set ReselectIncrease with the translational speed of UE reduces.
Described parameter is provided with module and is further used for, according to the translational speed of the UE that receives with offset parameter TO between level nBe arranged to have functional relation, and TO is set with the translational speed of UE nIncrease with the translational speed of UE reduces.
Adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, described parameter is provided with module and is further used for, with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
A kind of method and RNC that cell reselection parameters is set provided by the present invention, utilize the translational speed of UE accurately to reflect the motion state of UE, and the effect of dynamically adjusting arranged with the real-time change of UE translational speed, solved prior art under scene such as along the line such as high-speed railway (highway), cell reselection parameters is set to be provided with fixing, the problem of very flexible can not adapt to the motion state problem of UE in real time.
Correspondingly, a kind of method of cell reselection provided by the present invention has improved UE carries out the sub-district gravity treatment under the high speed scene accurate and promptness.
Description of drawings
Fig. 1 is the schematic diagram that prior art high speed railway sub-district along the line covers;
Fig. 2 is a kind of method of cell reselection flow chart of the present invention;
Fig. 3 is the flow chart of the residence reselecting of the embodiment of the invention one;
Fig. 4 is the schematic diagram of hierarchical network architecture in the embodiment of the invention two;
Fig. 5 is the flow chart of the residence reselecting of the embodiment of the invention two;
Fig. 6 realizes Q for the present invention with piecewise function HystSchematic diagram with the corresponding relation of the translational speed of UE;
Fig. 7 is the composition structural representation of the system of the present invention's a kind of sub-district gravity treatment.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
A kind of method of cell reselection provided by the present invention as shown in Figure 2, mainly may further comprise the steps:
Step 201, NodeB by measuring UE in its coverage cell translational speed and report RNC.
NodeB measures the translational speed of UE in its coverage cell can be in the following way: resident to certain sub-district as UE, this sub-district is the current service cell of UE.At this moment, can arrange a frequency that sends signal mutually between UE and the NodeB, when UE communicates by letter with NodeB, UE sends signal with the frequency of this agreement to NodeB, but because the influence of the Doppler frequency shift that the UE motion time is produced, there is deviation between the frequency that has caused that NodeB receives from the signal frequency of UE and agreement.NodeB obtains this deviation by real-time measurement, obtains the Doppler frequency shift of UE according to this deviation, and further calculates the translational speed of UE by following formula:
f d = V C COSθ
Wherein, V represents the translational speed of UE, f dThe Doppler frequency shift of the UE that expression NodeB measures, C represents the light velocity, and θ represents that the UE signal arrives the angle of arrival of the antenna of NodeB, and θ is that NodeB is known.
In actual applications, because along the line at high-speed railway, UE normally concentrates ON TRAINS, so NodeB can collect the translational speed of numerous UE at short notice, and concentrate report the translational speed of these UE to RNC.
NodeB reports RNC by measurement report with the translational speed of UE, and so-called measurement report is a piece of news of NodeB to RNC report measurement result, comprises in this measurement report:
(1) identification number of this UE of unique identification, identification number can be the shared Radio Link of this UE number (RL-id, Radio Link id).
(2) NodeB is by measuring the translational speed of this UE of gained.
Preferably, can also comprise in this measurement report:
(3) NodeB measures the signal strength indicator that gained reflects this UE, for example: signal interference ratio value of this UE signal (SIR, Signal Interference Ratio) or received signal power (RSCP, Received SignalCode Power) value etc.
(4) NodeB measures the Doppler frequency shift of this UE of gained.
Further, NodeB reports its translational speed of measuring the UE of gained to RNC, can directly report the actual value of this speed; Perhaps can report the grade point of this speed, grade point is made an appointment by RNC and NodeB, and for example: the speed predefine of 0-30m/s is grade A, and the speed predefine of 30-50m/s is grade B, and the above speed predefine of 50m/s is grade C.
Step 202, RNC is provided with the parameter that UE carries out the sub-district gravity treatment according to the translational speed of the UE that NodeB reports, and the parameter that is provided with is sent to all UE in the sub-district by NodeB.
Preferable, for the concentrated situation that reports the translational speed of numerous UE in its coverage cell of NodeB, RNC is after receiving the translational speed of these UE, can do the processing of further statistical average, for example: get mean value, median, root mean square of these translational speeds that report etc., the purpose that adopts above-mentioned processing is that the statistics acquisition embodies the value of the average level of these translational speeds that report, and then will handle the back assembly average, and the foundation of cell reselection parameters is set as RNC.
RNC can be arranged in the following cell reselection parameters at least one to have functional relation with the translational speed of UE:
In order to calculate the sluggish parameter Q of current service cell grade point Hyst
In order to calculate the offset parameter Q of neighbor cell grade point Offsets
Second timer time parameter T ReselectAnd
For the sub-district of hierarchical network architecture, also comprise offset parameter TO between level nAnd
RNC can also newly in addition introduce a first timer parameter T 1, and it is arranged to have functional relation with the translational speed of UE.
In addition, adopt along the line for high-speed railway in the network of hierarchical network architecture, RNC also needs railway native region priority parameter along the line is provided with: with the level priority (HCS_PRIO of private network neighbor cell 1) be arranged to low value, with the level priority (HCS_PRIO of public network neighbor cell 2) be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
Step 203, UE measures the sub-district according to the parameter that receives, and carries out the sub-district gravity treatment according to measurement result.
Below in conjunction with specific embodiment above-mentioned method of cell reselection is further elaborated.In embodiments of the invention one, network configuration is a non-layered networks, as shown in Figure 3, realizes that according to the translational speed of UE the step of sub-district gravity treatment is as follows:
Step 301, UE is resident to current service cell, and the NodeB of this Serving cell measures the translational speed of UE and reports RNC.
Step 302, RNC is provided with the parameter that UE carries out the sub-district gravity treatment according to the translational speed of the UE that receives, and the parameter that is provided with is sent to UE by NodeB.
For the sub-district of non-layered networks structure, RNC comprises according to the cell reselection parameters of the translational speed setting of the UE that reports: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, and in order to calculate the offset parameter Q of neighbor cell grade point OffsetsWherein, first timer time T 1It is the new parameter of introducing of the present invention.According to actual needs, RNC can only choose wherein one or multiple parameters and be provided with according to the translational speed of UE, and remaining parameter can still be provided with by prior art.
The functional relation of parameter is provided with specific as follows:
1, first timer time T 1: RNC can estimate the time that UE runs to the Serving cell borderline region according to the movement velocity of UE and the geographic area, sub-district that knows, and the time that estimates is provided with the first timer time T 1T is set 1Effect be to trigger UE more accurately to begin the received signal intensity of Serving cell is measured.
2, in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point Offsets:
Q HystBe arranged to reduce Q with the increase of the translational speed of UE OffsetsAlso be arranged to reduce with the increase of the translational speed of UE.Preferably, if NodeB directly reports the actual value of its measured acquisition to RNC before, RNC can adopt linear function to realize the setting of above-mentioned parameter so, for example: Q is set HystWith the pass of the translational speed of UE be: Q Hyst=Q Hyst0-qv, wherein, Q Hyst0Expression Q HystFiducial value, be a constant value, q＞0, v represents the actual value of the translational speed of UE.If the NodeB translational speed of coming to report to RNC the UE of its measured acquisition in the mode of grade point before, RNC can adopt the mode of piecewise function to realize the setting of above-mentioned parameter so, promptly represents Q in the piecewise function as shown in Figure 6 HystIncrease with the translational speed of UE reduces.
Q HystAnd Q OffsetsTwo parameters can only select one of them translational speed according to UE to be provided with, and another is set to fixed value, also can two all be provided with according to the translational speed of UE.
3, second timer time T Reselect, T is set ReselectWith the corresponding relation of the translational speed of UE be: T ReselectIncrease with the translational speed of UE reduces T ReselectBe provided with and can adopt the mode of linear function or piecewise function to realize equally, for example: T is set Reselect=T Reselect0-uv, wherein, T Reselect0Expression T ReselectFiducial value, u＞0; T ReselectBe provided with and can also realize by multiply by a mode of dwindling the factor, such as, when RNC judges the UE translational speed greater than some threshold values, T is set Reselect=T Reselect0S, 0＜s＜1, i.e. the factor is dwindled in expression.
T ReselectEffect be to weigh the sub-district of the most suitable gravity treatment be selected whether can be finally by gravity treatment, if promptly a neighbor cell is at T ReselectCan remain the sub-district of the most suitable gravity treatment in time, so UE can gravity treatment to this neighbor cell.
In addition, RNC also is provided with the parameter of other sub-district gravity treatment when the translational speed of foundation UE is provided with above-mentioned cell reselection parameters, for example: the neighbor cell list of measurement triggering thresholding S and UE etc., these are provided with still presses existing techniques in realizing, repeats no more among the present invention.
RNC sends to NodeB with the parameter that is provided with after setting up the parameter that all UE carry out the sub-district gravity treatment, be transmitted to UE by NodeB by the SIB on the BCH of sub-district again.
In actual applications, first timer time T 1Both UE can be sent to, also UE can be do not sent to.If T 1Send to UE, UE is from receiving T so 1In time, pick up counting, and at T 1Timing time then initiatively triggers the received signal intensity of current service cell is measured; Perhaps at T 1Before timing time arrives, to measure, at T than the long time cycle 1Timing time is then measured with the short time cycle.If T 1Do not send to UE, RNC estimates T in inside so 1In time, pick up counting, and at T 1Timing time then sends triggering message to UE, triggers UE and begins the received signal intensity of current service cell is measured.
Embodiment illustrated in fig. 3ly do not send T with RNC 1Giving the situation of UE is that example describes.
In actual applications, for T ReselectDwindle the situation that the factor is provided with by multiply by one, also can be by RNC with T Reselect0With dwindle factor s and send to UE, by UE oneself T is set then Reselect=T Reselect0S realizes.
Step 303, RNC starts timer T 1, and at T 1Timing time then triggers the received signal strength S that UE measures current service cell x
Step 304 is judged S xWhether be less than or equal to measurement triggering thresholding S, if, execution in step 305; Otherwise, continue to measure and continue and judge.
Wherein, measurement triggering thresholding S comprises: with frequency thresholding S Intrasearch, alien frequencies thresholding S IntersearchWith the different thresholding S of system SearchratmThe S that UE measures xNeed and S Intrasearch, S IntersearchAnd S SearchratmCompare respectively, according to comparative result, as long as S xBe less than or equal to wherein any one, promptly forward step 305 to.
Step 305, UE carries out the received signal intensity of the neighbor cell in the neighbor cell list is measured.
The measurement triggering thresholding S that mentions setting above comprises: S Intrasearch, S IntersearchAnd S Searchratm, the corresponding nearby region measurement that is triggered is respectively homogeneous-frequency adjacent-domain measurement, alien frequencies nearby region measurement and different system nearby region measurement.Thereby UE specifically comprises following situation to the measurement of neighbor cell:
If S x≤ S Intrasearch, then the UE startup is measured the received signal intensity of adjacent co-frequency cell in the tabulation;
If S x≤ S Intersearch, then the UE startup is measured the received signal intensity of adjacent alien-frequency district in the tabulation;
If S x≤ S Searchratm, then the UE startup is measured the received signal intensity of adjacent different system cell in the tabulation.
In actual applications, the priority of select co-frequency cell during the gravity treatment of UE sub-district, selecting alien-frequency district and select different system cell to carry out gravity treatment reduces successively, therefore, and S Intrasearch, S IntersearchAnd S SearchratmValue reduce successively.
Step 306, UE judges whether to exist the neighbor cell that satisfies resident condition, if then execution in step 307 according to the measurement result that the received signal intensity of neighbor cell is measured; Otherwise, continue neighbor cell measurement and continuation are judged.
So-called certain neighbor cell satisfies resident condition, is meant:
First, the signal strength signal intensity of this neighbor cell is greater than certain value, for example: Qrxlevmeas＞Qrxlevmin, wherein, Qrxlevmeas represents the received signal level value of this neighbor cell that UE measures, and Qrxlevmin represents that UE wants resident to a minimum levels value that the sub-district is required.
The second, except satisfying above-mentioned signal strength conditions, this neighbor cell also must be that operator allows the sub-district inserted.
Step 307, UE calculates all grade points that satisfy the neighbor cell of resident condition, and chooses the highest neighbor cell of grade point as the sub-district of suitable gravity treatment from the neighbor cell of grade point greater than the current service cell grade point, starts timer T simultaneously ReselectCarry out timing.
The method that UE calculates the current service cell grade point is: R s=Qmeas s+ Q Hyst+ Q Offmbms,
Wherein, R sThe grade point of expression UE current service cell, Qmeas sThe received signal intensity of the UE current service cell that obtains is measured in expression, for example: can be Primary Common Control Physical Channel (P-CCPCH, Primary Common Control Physical Channel) received signal code power on (RSCP, Received Signal Code Power) value; Q OffmbmsSide-play amount when expression UE uses the multimedia broadcasting frequency band, Q OffmbmsAlso be the parameter that in SIB message, is handed down to the sub-district gravity treatment of UE in advance by RNC, repeat no more herein.
The method that UE calculates the neighbor cell grade point is: R n=Qmeas n-Q Offsets+ Q Offmbms
Wherein, R nThe grade point of expression neighbor cell, Qmeas nThe level value of the received signal intensity of the neighbor cell that expression measure to obtain, i.e. RSCP value on P-CCPCH, Q OffmbmsSide-play amount when expression UE uses the multimedia broadcasting frequency band.
As can be seen, when UE (its translational speed is very big) under the rapid movement state, so or R s(because Q diminishes HystDiminish), perhaps R nBecome big (because Q OffsetsDiminish), the easier grade point that is higher than current service cell of the grade point of neighbor cell like this.
UE satisfies the priority R of the neighbor cell of resident condition with all nPriority R with the UE current service cell sCompare, from greater than R sR nIn choose maximum, with peaked R nPairing neighbor cell is as the sub-district of suitable gravity treatment, and starts timer T simultaneously ReselectCarry out timing.
From above-mentioned analysis, can see, no matter with Q Hyst, Q OffsetsIt is relevant with the translational speed of UE which parameter is arranged to, effect all is to make UE when increasing (UE translational speed) when high-speed motion, the easier grade point that is higher than current service cell of the grade point of neighbor cell, therefore any one of two parameters is arranged to the function of the translational speed of UE, its effect all is of equal value.
Step 308, UE judges that the sub-district of choosing is at timer T ReselectDuration in whether can remain the sub-district of suitable gravity treatment, if then execution in step 309; Otherwise, return step 307, continue to seek the sub-district of the most suitable gravity treatment.
Step 309, UE gravity treatment be to the sub-district of suitable gravity treatment, and register to network side by registration message; After RNC receives the registration message of UE, neighbor cell list and relevant parameter after UE sends renewal.
In embodiments of the invention two, network configuration is a hierarchical network, and so-called hierarchical network is meant and sets up macrocell and the more Microcell of number that the overlay area varies in size in same zone as shown in Figure 4.In the high-speed railway of reality wireless arranging net along the line, hierarchical network is more common situation, and wherein macrocell constitutes the network (private network) of the UE of service-specific in train; Microcell is common network (public network), covers other UE, and the sub-district of two class networks belongs to different levels.
For the UE in the bullet train that is in the private network covering, translational speed information according to UE realizes the sub-district gravity treatment except the accuracy and efficient that can improve the sub-district gravity treatment, can also obtain the UE that keeps on the train and reside in beneficial effect in the private network sub-district.
As shown in Figure 5, in hierarchical network, utilize the translational speed of UE to realize that the step of sub-district gravity treatment is as follows:
Step 501, UE is resident to current service cell, and the NodeB of this Serving cell measures the translational speed of UE and reports RNC.
In actual applications, NodeB often can collect the translational speed that concentrates on a plurality of UE on the train at short notice, and with the concentrated RNC that sends to of the measurement result of these UE.
Step 502, the translational speed of the UE that the RNC basis reports is provided with UE and carries out the required parameter of sub-district gravity treatment, and the neighbor cell list of UE is set, and parameter and the tabulation that is provided with sent to UE by NodeB.
Preferable, be similar to embodiment one, for NodeB concentrate report the translational speed of a plurality of UE in its coverage cell the time, RNC can do the processing of further statistical average after the translational speed that receives a plurality of UE, the result with statistical average is provided with parameter then.
For floored community, RNC comprises according to the set cell reselection parameters of the translational speed of UE: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, in order to calculate the offset parameter Q of neighbor cell grade point Offsets, and level between offset parameter TO nAccording to actual needs, RNC can only choose wherein one or multiple parameters and be provided with according to the translational speed of UE, and remaining parameter still is provided with by prior art.
T 1, T Reselect, Q Hyst, Q OffsetsMethod to set up identical with embodiment one, the corresponding relation of the translational speed of they and UE is: T ReselectBe arranged to reduce Q with the increase of the translational speed of UE HystAnd Q OffsetsBe arranged to reduce with the increase of the translational speed of UE.
In actual applications, T 1Both UE can be sent to, also UE can be do not sent to.T ReselectEmploying is dwindled the factor when being provided with, and also can directly not send to UE, but dwindling the factor and T ReselectFiducial value sends to UE, allows UE oneself be provided with then, repeats no more herein.
Offset parameter TO between level nBe arranged to reduce, can adopt the mode of linear function or piecewise function to realize this set, for example: TO with the increase of the translational speed of UE n=TEMP_OFFSET 0-v|f d|, wherein, TEMP_OFFSET 0Expression TO nFiducial value, v＞0.In the practical application, past contact meeting is to TO nEffect add a temporal restriction, such as the timer that a Tn is set, TO so nExpression formula just become TO n=(TEMP_OFFSET 0-v|f d|) W (Tn), the implication of W (Tn) is to make TO nValue is only effective in the time at Tn, and promptly in the time of Tn, W (Tn)=1 is at the time that surpasses Tn, W (Tn)=0.
In addition, for high-speed railway or highway hierarchical network architecture along the line, the level priority (HCS_PRIO of the private network sub-district that RNC is along the line with railway 1) be arranged to low value, with the level priority (HCS_PRIO of public network cell 2) be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1Here said level priority (HCS_PRIO) also is the parameter of being set by RNC, gets 0 to 7 an interval interior integer, and 7 expressions are the highest preferential, and 0 expression is minimum preferential.
RNC also is provided with the parameter and the neighbor cell list (not being the translational speed setting according to UE) of other sub-district gravity treatment when the translational speed of foundation UE is provided with above cell reselection parameters.Afterwards, RNC sends to NodeB with parameter and the neighbor cell list that is provided with, and gives UE by NodeB by the SIB forwards on the BCH channel of sub-district again.
Step 503, UE starts timer T 1, and at T 1Timing time then starts the received signal strength S of measuring current service cell x
Step 504 is judged S xWhether be less than or equal to measurement triggering thresholding S, if execution in step 505 is judged otherwise continue to measure and continue.
Measurement triggering thresholding S comprises: with frequency thresholding S Intrasearch, alien frequencies thresholding S IntersearchWith the different thresholding S of system Searchratm, the three describes in the described embodiment of Fig. 3.Describe for simplifying, among this embodiment with S IntersearchFor example is proceeded explanation; In the high-speed railway private network scene of reality, the frequency of private network and public network adjacent area often is made into alien frequencies.Accordingly, if S x≤ S Intersearch, then execution in step 505.
Step 505 is at S x≤ S MtersearchThe time, the UE startup is measured the received signal intensity of adjacent alien-frequency district in the tabulation.
Step 506, UE judges whether to exist the neighbor cell that satisfies resident condition according to the measurement result that the received signal intensity of adjacent alien-frequency district is measured, if exist, then execution in step 507; Otherwise, continue neighbor cell measurement and continuation are judged.
Step 507, UE calculates all grade points that satisfy the neighbor cell of resident condition (H value), and therefrom finds out all H values greater than 0 neighbor cell, if can not find the H value greater than 0 neighbor cell, changes step 506 (not pointing out among the figure) so.The computational methods of H value are as follows:
UE calculates the H value of current service cell: H s=Qmeas s-Qhcs s,
UE calculates the H value of neighbor cell: H n=Qmeas n-Qhcs n-TO nLn,
Wherein, subscript s represents current service cell, and subscript n is represented neighbor cell; Qmeas represents by the received signal intensity of measuring acquisition; Qhcs sAnd Qhcs nIt is other parameter of configuration in the system message (SIB); TO nIt is different layers inter-stage offset parameter; Ln is the level flag bit, promptly when this neighbor cell and current service cell be not during with level, Ln=1; Be during with level, Ln=0.
If UE can find the H value greater than 0 sub-district, UE sorts these sub-districts according to level priority (HCS_PRIO) so; Seek therein then:
1, in than the lower sub-district of the level priority of current service cell, finds out the highest sub-district of level priority, form a set of cells.
2, when 1 condition can not satisfy, so equate with the level priority of current service cell or higher sub-district in find out the minimum sub-district of level priority.
This shows,, and cooperate TO because RNC is arranged to be lower than the level priority of public network cell with the level priority of private network sub-district along the line before nThe effect of Ln item makes that the UE of high-speed motion can be resident accurately in private network.Be analyzed as follows: when certain UE under high-speed motion state, TO nDiminish TO nNo matter the effect of Ln weakens, so with the adjacent area of level priority, still with its H of adjacent area of level priority nBecome big, that is to say that the H value of this adjacent area is easier of 0, thereby strengthened this adjacent area by the possibility of gravity treatment.Further, because the level priority of private network sub-district is lower than the level priority of public network cell, UE will preferentially select the private network sub-district so.So no matter the original resident sub-district of UE is private network or public network cell, as long as its fast moving, it will be resident in private network so.
Because the unreliability of wireless environment transmission, the level priority of service area or adjacent area may not send to the UE place, at this moment UE should be arranged to the level priority of adjacent area acquiescently identical with service area, i.e. HCS_PRIO 2=HCS_PRIO 1The benefit of default setting is like this: do not reduce the frequency of UE gravity treatment, that is to say, the signal quality of current service cell can thereby not influence UE normal sub-district gravity treatment because of the former of level priority after descending; Simultaneously, avoided UE resident in the various level sub-district as much as possible, the UE in the so original private network can continue to reside in the private network.
Step 508 after UE finds out these sub-districts, is formed a subset of cells, then its grade point (R value) is calculated in each sub-district in this subclass.
UE calculates the grade point of current service cell: R s=Qmeas s+ Q Hyst+ Q Offmbms,
UE calculates the grade point of neighbor cell: R n=Qmeas n-Q Offsets+ Q Offmbms-TOn (1-Ln)
Herein, Qmeas, Q Hyst, Q Offsets, Ln implication consistent with description before.
UE carries out sorting by grade point after grade point (R value) calculates to the sub-district in the top described subclass; Find out the highest neighbor cell of grade point as the sub-district of suitable gravity treatment, start second timer T simultaneously ReselectCarry out timing.
This shows, when the UE rapid movement, the R of neighbor cell nIt is big that value becomes, thereby accelerated gravity treatment.
Step 509, UE judges that the sub-district of choosing is at timer T ReselectDuration in whether can remain the sub-district of suitable gravity treatment, if then execution in step 510; Otherwise, return step 507, continue to seek the sub-district of the most suitable gravity treatment.
According to described in the step 502, the T of setting ReselectIncrease with the translational speed of UE reduces, so the translational speed of UE is big more, suitable cell with regard to only needing to keep the short more time by gravity treatment.
Step 510, the UE gravity treatment is to the sub-district of suitable gravity treatment.
More than two embodiment be that sub-district gravity treatment with high-speed railway sub-district along the line illustrates implementation of the present invention.But mandatory declaration is that the also suitable sub-district gravity treatment that is under the high-speed motion scene with other user terminals such as highway, magnetic suspension of the present invention realizes except high-speed railway is along the line.
In addition, the residence reselecting of corresponding above-mentioned non-layered networks structure, the present invention also provides a kind of method that non-layered networks structure sub-district is provided with cell reselection parameters in RNC, comprising:
Step a, the translational speed of the UE that RNC reception NodeB reports.
Step b, RNC is arranged in the following parameter at least one to have functional relation with the translational speed of UE according to the translational speed of the UE that receives: T 1, T Reselect, Q HystAnd Q Offsets
Preferable, RNC can be provided with Q HystIncrease with the translational speed of UE reduces, and Q is set OffsetsIncrease with the translational speed of many UE reduces, and T is set ReselectIncrease with the translational speed of UE reduces.And the setting of above-mentioned parameter can realize by linear function or piecewise function.
The residence reselecting of corresponding above-mentioned hierarchical network architecture, the present invention also provides a kind of sub-district to hierarchical network architecture that the method for cell reselection parameters is set, and comprising:
Steps A, the translational speed of the UE that RNC reception NodeB reports.
Step B, RNC according to the translational speed of the UE that receives with offset parameter TO between level nBe arranged to have functional relation, and TO is set with the translational speed of UE nIncrease with the translational speed of UE reduces.
Certainly, RNC also can be provided with above-mentioned T 1, T Reselect, Q Hyst, Q OffsetsIn at least one and the translational speed of UE have functional relation.Adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, RNC is with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
For realizing above-mentioned method of cell reselection, the present invention also provides the system of a kind of sub-district gravity treatment, and as shown in Figure 7, this system comprises: NodeB 10, RNC 20 and UE 30.NodeB 10, are used to measure the translational speed of UE 30 in its coverage cell and report RNC 20.RNC 20, and the translational speed that is used for the UE 30 that reports according to NodeB10 is provided with the parameter that UE 30 carries out the sub-district gravity treatment, and the parameter that is provided with is sent to all UE 30 in the sub-district by NodeB 10.UE 30, are used for according to the parameter that receives the sub-district being measured, and carry out the sub-district gravity treatment according to measurement result.
Wherein, RNC 20 comprises that further receiver module 21 and parameter are provided with module 22.Receiver module 21 is used to receive the translational speed of the UE 30 that NodeB 10 reports.Parameter is provided with module 22, is used for the translational speed according to the UE 30 that receives, and in the following cell reselection parameters at least one is arranged to have functional relation with the translational speed of UE 30: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point OffsetsQ is set HystIncrease with the translational speed of UE reduces, and/or Q is set OffsetsIncrease with the translational speed of UE reduces, and/or T is set ReselectIncrease with the translational speed of UE reduces.
For the sub-district of hierarchical network architecture, parameter is provided with module 22 and also is used for offset parameter TO between level nBe arranged to have functional relation with the translational speed of UE 30, and TO nBe arranged to reduce with the increase of the translational speed of UE 30.
Adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, parameter is provided with module 22 and is further used for, with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
In addition, when UE 30 did not receive the level priority of current service district and adjacent area, UE should be arranged to the level priority of adjacent area identical with service area acquiescently.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (29)

1. a method of cell reselection is characterized in that, this method comprises:
Base station (NodeB) measures the translational speed of user terminal (UE) in its coverage cell and reports radio network controller (RNC);
Described RNC is provided with the parameter that UE carries out the sub-district gravity treatment according to the translational speed of the UE that NodeB reports, and the parameter that is provided with is sent to all UE in the sub-district by NodeB;
UE measures the sub-district according to the parameter that receives, and carries out the sub-district gravity treatment according to measurement result.
2. according to the described method of cell reselection of claim 1, it is characterized in that described RNC is arranged in the following cell reselection parameters at least one to have functional relation with the translational speed of UE: the first timer time T 1With the second timer time T Reselect
3. according to the described method of cell reselection of claim 2, it is characterized in that described RNC is provided with the second timer time T ReselectIncrease with the translational speed of UE reduces.
4. according to the described method of cell reselection of claim 3, it is characterized in that described RNC is by linear function, or piecewise function, or multiply by and dwindle factor pair T ReselectBe provided with.
5. according to claim 1 or 2 described method of cell reselection, it is characterized in that described RNC is arranged in the following cell reselection parameters at least one to have functional relation with the translational speed of UE: in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point Offsets
6. according to the described method of cell reselection of claim 5, it is characterized in that this method further comprises: described RNC is provided with Q HystIncrease with the translational speed of UE reduces, and Q is set OffsetsIncrease with the translational speed of UE reduces.
7. according to the described method of cell reselection of claim 6, it is characterized in that, described RNC by linear function or piecewise function to Q HystAnd Q OffsetsIn at least one be provided with.
8. according to the described method of cell reselection of claim 1, it is characterized in that for the sub-district of hierarchical network architecture, described RNC is with offset parameter TO between level nBe arranged to have functional relation with the translational speed of UE, and, TO is set nIncrease with the translational speed of UE reduces.
9. described according to Claim 8 method of cell reselection is characterized in that, described RNC is by linear function, or piecewise function, or multiply by and dwindle factor pair TO nBe provided with.
10. according to claim 1 or 8 described method of cell reselection, it is characterized in that for the sub-district that high-speed railway or highway adopt hierarchical network architecture cloth net mode along the line, described RNC is with the level priority (HCS_PRIO of private network sub-district along the line 1) be arranged to low value, with the level priority (HCS_PRIO of public network cell 2) be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
11., it is characterized in that UE is according to T according to the described method of cell reselection of claim 2 1Execution is specially the measurement of sub-district: described UE is at T 1Timing then, to the received signal strength S of current service cell xMeasure, with described S xCompare with default measurement triggering thresholding S, and at S xDuring≤S,, the received signal intensity of the neighbor cell in the described neighbor cell list is measured according to the neighbor cell list that RNC sends;
Perhaps, described UE is at T 1Before timing time arrives, with the received signal strength S of long time cycle to current service cell xMeasure; At T 1Timing time then, with the received signal strength S of short time cycle to current service cell xMeasure; With described S xCompare with default measurement triggering thresholding S, and at S xDuring≤S,, the received signal intensity of the neighbor cell in the described neighbor cell list is measured according to the neighbor cell list that RNC sends.
12., it is characterized in that this method further comprises according to the described method of cell reselection of claim 11:
Described RNC is with the T that is provided with 1Send to UE, described UE is according to the T that receives 1Execution is to the measurement of sub-district;
Perhaps, described RNC is not with the T that is provided with 1Send to UE, described RNC is according to T 1Carry out timing, and trigger the measurement of described UE execution the sub-district.
13. according to the described method of cell reselection of claim 1, it is characterized in that, described RNC is provided with UE according to the translational speed of UE and carries out the required parameter of sub-district gravity treatment, further comprise: receiving the translational speed of a plurality of UE that NodeB reports as described RNC after, get the assembly average of a plurality of translational speeds that report, and UE is set carries out the required parameter of sub-district gravity treatment according to described assembly average.
14. the system of a sub-district gravity treatment is characterized in that, this system comprises: NodeB, RNC and UE, wherein,
Described NodeB is used to measure the translational speed of UE in its coverage cell and report described RNC;
Described RNC, the translational speed that is used for the UE that reports according to NodeB is provided with the parameter that UE carries out the sub-district gravity treatment, and the parameter that is provided with is sent to all UE in the sub-district by NodeB;
Described UE is used for according to the parameter that receives the sub-district being measured, and carries out the sub-district gravity treatment according to measurement result.
15. the system according to claim 14 described sub-district gravity treatment is characterized in that, described RNC is further used for, and in the following cell reselection parameters at least one is arranged to have functional relation with the translational speed of UE: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point HystWith offset parameter Q in order to calculating neighbor cell grade point Offsets
16. the system according to claim 14 or 15 described sub-district gravity treatments is characterized in that described RNC is further used for, with offset parameter TO between level nBe arranged to have functional relation with the translational speed of UE, and TO nBe arranged to reduce with the increase of the translational speed of UE.
17. the system according to claim 14 or 15 described sub-district gravity treatments is characterized in that, adopts the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, described RNC is further used for, with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
18. system according to claim 14 described sub-district gravity treatment, it is characterized in that, described UE is further used for, under the situation of the level priority of level priority (HCS_PRIO) that does not receive current service cell or adjacent area, the level priority with the adjacent area of described UE acquiescence is arranged to identical with service area.
19. the method that cell reselection parameters is set is characterized in that, this method comprises:
The translational speed of the UE that described RNC reception NodeB reports;
Described RNC is arranged in the following parameter at least one to have functional relation with the translational speed of UE according to the translational speed of the UE that receives: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, in order to calculate the offset parameter Q of neighbor cell grade point Offsets
20. according to the described method that cell reselection parameters is set of claim 19, it is characterized in that this method further comprises: described RNC is provided with Q HystIncrease with the translational speed of UE reduces.
21. according to the described method that cell reselection parameters is set of claim 19, it is characterized in that this method further comprises: described RNC is provided with Q OffsetsIncrease with the translational speed of UE reduces.
22. according to the described method that cell reselection parameters is set of claim 19, it is characterized in that this method further comprises: described RNC is provided with T ReselectIncrease with the translational speed of UE reduces.
23. according to the described method that cell reselection parameters is set of claim 19, it is characterized in that, described RNC by linear function or piecewise function to T 1, T Reselect, Q Hyst, Q OffsetsIn at least one be provided with.
24., it is characterized in that for the hierarchical network architecture network, this method further comprises according to the described method that cell reselection parameters is set of claim 23: described RNC according to the translational speed of the UE that receives with offset parameter TO between level nBe arranged to have functional relation, and TO is set with the translational speed of UE nIncrease with the translational speed of UE reduces.
25. according to claim 23 or the 24 described methods that cell reselection parameters is set, it is characterized in that, adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, this method further comprises: described RNC is with the HCS_PRIO of private network sub-district along the line 1Be arranged to low value, with the HCS_PRIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
26. a RNC is characterized in that, comprising:
Receiver module is used to receive the translational speed of the UE that NodeB reports;
Parameter is provided with module, is used for being arranged to have functional relation with the translational speed of UE according at least one with following parameter of the translational speed of the UE that receives: the first timer time T 1, the second timer time T Reselect, in order to calculate the sluggish parameter Q of current service cell grade point Hyst, in order to calculate the offset parameter Q of neighbor cell grade point Offsets
27., it is characterized in that described parameter is provided with module and is further used for, and Q is set according to the described RNC of claim 26 HystIncrease with the translational speed of UE reduces, and/or Q is set OffsetsIncrease with the translational speed of UE reduces, and/or T is set ReselectIncrease with the translational speed of UE reduces.
28. according to claim 26 or 27 described RNC, it is characterized in that described parameter is provided with module and is further used for, according to the translational speed of the UE that receives with offset parameter TO between level nBe arranged to have functional relation, and TO is set with the translational speed of UE nIncrease with the translational speed of UE reduces.
29., it is characterized in that adopt the network of hierarchical network architecture cloth net mode along the line for high-speed railway or highway, described parameter is provided with module and is further used for, with the HCS_PRIO of private network sub-district along the line according to the described RNC of claim 28 1Be arranged to low value, with the HCS_RIO of public network cell 2Be arranged to high value, i.e. HCS_PRIO 2＞HCS_PRIO 1
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