CN102932865B - The mobile status appraisal procedure of subscriber equipment and equipment in cordless communication network - Google Patents
The mobile status appraisal procedure of subscriber equipment and equipment in cordless communication network Download PDFInfo
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Abstract
The present invention proposes a kind of method that subscriber equipment in the coverage of assisted cell switches within a wireless communication network.The method includes: base station obtains mobile status assessment parameter, and, base station sends the message including described mobile status assessment parameter to subscriber equipment, in order to by described subscriber equipment according to described mobile status assessment parameter determination mobile status adaptive actual translational speed.Compared with UE self-evaluation method, the UE mobile status evaluation mechanism of the enhancing that the present invention proposes has high reliability and mobile robustness.
Description
Technical field
The present invention relates to cordless communication network, be specifically related to switching within a wireless communication network or cell reselection.
Background technology
In order to meet the quick demand of data, services, operator, in addition to disposing macrocellular, also includes pico node, millimicro
Micro-node, via node and RRH (remote radio head) etc. so-called " low transmission power node " are introduced into extended network
Cover and systematic function.In such heterogeneous network (HetNet), due to the little covering model of these " low transmission power nodes "
Enclosing, the chance of switching or cell reselection becomes the most, especially true for highspeed user's equipment (UE).Due to the most just
True configuration can cause reducing Consumer's Experience and wasting Radio Resource, and then causes handoff failure, ping-pong etc., thus,
In HetNet scheme, the optimum moving parameter of configuration has more challenge.
In cell reselection (UE to being in RRC idle condition) or switching (UE to being in RRC connection status), UE will
Firstly evaluate the mobile status of oneself, be represented by within the persistent period that certain is predetermined the number of the community crossed over.To retouch below
State common method.Every time during cell change, UE can by the number of times increase of cell reselection or switching once.
If at the high threshold that predetermined lasting time count value exceedes, UE determines that it is in high-mobility state.If
But predetermined lasting time count value exceedes intermediate threshold not less than high threshold, and UE determines that it is in middling speed mobile status.No
Then, UE determines that it is in general mobile status.
Assessing based on mobile status, UE can be regulated its moving parameter, such as, be biased by increase for idle UE
(offset) TimeToTrigger is regulated to lagged value (hysteresis value) or the UE Graph One factor for connecting
The ratio in (triggered time) is with adaptive actual translational speed.
Here offset is the parameter adjusted for adaptive different mobility.Such as, in conventional translational speed
Under, if the signal intensity that accepts of neighbor cell is that-90dBm can select as UE or the suitable cell of switching, but UE exists
What the time selective fading under high mobility can deteriorate UE accepts performance, needs for this to arrange certain compensation mechanism, as
Offset is set to 6dB；In other words, it is simply that UE knows when laying oneself open to high-speed mobile, the signal intensity of neighbor cell reach-
Just can select or be switched to this candidate cell during more than 84dBm (-90dBm+6dB).Hysteresis value is for overcoming table tennis
The parameter set by purpose such as pang effect or unloading handling capacity, the signal intensity of such as current area is-90dBm, adjacent little
District is-85dBm, is 10dB as arranged Hysteresis value, then only just can start cut when neighbor cell reaches-80dBm
Change；TimeToTrigger refers to that UE just can trigger also when meeting specific condition (such as switching condition) in the specified time
This measurement report is passed to eNB；If high speed UE is moved in the community that covering radius is little, it is necessary to reduce
In triggered time indicated by TimeToTrigger, otherwise switching is not carried out complete, and UE will depart from this Serving cell and cause and cut
The failure changed.
Commonsense method is for the homogeneous network that the difference in size between community is relatively small, and working together to compare has
Effect.But, in the HetNet of " low transmission power node " with dense deployment, the change of cell size can highly significant.
As UE, just number of times to cell change counts determine mobile status and adjust its moving parameter, mobility based on assessment
Can will become instability and even have many radio jink failure generations.Fig. 1 gives in HetNet when UE is through many small-sized
UE ambulant example during community.UE may assess it improperly and be in high-speed moving state.And under its meeting in proportion
Adjust moving parameter to adapt to high-speed mobile sexual state, the most shorter TimeToTrigger so that handoff procedure faster.But
This incorrect assessment can cause handoff failure due to too early switching, and UE has to extensive with cell-of-origin execution wireless link
Multiple.In this process, pingpang handoff even can unpredictably occur.
In the prior art scheme, the UE mobile status evaluation problem of instability can't be solved in HetNet.A kind of
Directly solution is cellular network location method based on UE side.Position based on change, UE can assess it and move shape
State also correspondingly corrects its mobile status.But, localization method can relate to the many letters via wave point and core network
Order transmission.And if localization method is relevant to UE, UE battery consumption can be caused.Finally, the localization method of assessment UE speed can
Idle UE can be not particularly suited for.
Due to the cell size of change notable in HetNet, counted by the number of times purely switching or community selected
It is insecure for assessing mobile status.Hereinafter, proposition is had high reliability improve mechanism realize mobile robustness
Energy.
Summary of the invention
The basic thought of the present invention is, under the auxiliary of Serving cell, UE considers that the cell size in change is used for moving
Dynamic state estimation.Particularly, Serving cell can notify the information relevant about cell size and/or cell type to UE.Base
In this, UE can correct its mobile status assessment and adjust its moving parameter with adaptive actual mobile status.
Serving cell can notify the information relevant about cell size and/or cell type by several method to UE
Assess for mobile status.
Based on above understanding, the present invention proposes a kind of within a wireless communication network in the coverage of assisted cell
The method that subscriber equipment switches over, the method includes: base station obtains mobile status assessment parameter, and, base station sets to user
Preparation send the message including described mobile status assessment parameter, in order to by described subscriber equipment according to described mobile status assessment ginseng
Number determines mobile status adaptive actual translational speed.
According to a preferred embodiment of the invention, mobile status assessment parameter be following in one: mobile status assessment because of
Sub-a, a=(0,1], radius of society, cell transmission power, and the physics ID of community, i.e. PCI value.
According to embodiments of the invention, if mobile status assessment parameter is mobile status evaluation factor a, then increase with following formula
Add switching or the number of times F of cell reselectionn=Fn-1+ a 1, wherein, FnIt is the switching in current service cell or cell reselection
The quantity of correction, Fn-1It is the switching in a upper Serving cell or the quantity of community selection.
According to embodiments of the invention, corresponding to radius of society or cell type, PCI value is carried out scope division.
According to embodiments of the invention, if mobile status assessment parameter is radius of society, cell transmission power or PCI
Value, then be mapped to a ratio value by this mobile status assessment parameter, and proportionally value increase switching or the number of times of cell reselection.
According to embodiments of the invention, base station obtain mobile status assessment parameter include from adjacent base station mutual obtain
Obtain mobile status assessment parameter or obtain mobile status assessment parameter from Operation and Maintenance control node OMC.
The present invention also proposes a kind of subscriber equipment in assisted cell coverage within a wireless communication network and carries out
The base station of switching, described base station includes: for obtaining the device of mobile status assessment parameter, and, send bag to subscriber equipment
Including the device of the message of described mobile status assessment parameter, wherein, described mobile status assessment parameter will be by described subscriber equipment
Use to determine mobile status adaptive actual translational speed.
According to embodiments of the invention, for obtain the device of mobile status assessment parameter be configured to from phase
Adjacent base station mutual in obtain mobile status assessment parameter or control node OMC from Operation and Maintenance and obtain mobile status assessment ginseng
Number.
According to embodiments of the invention, described cordless communication network be GSM, WCDMA, LTE, CDMA, CDMA2000,
One of WiMAX network.
The present invention also proposes a kind of to switch over by means of the base station in cell coverage area within a wireless communication network
Subscriber equipment, this subscriber equipment includes: for the mobile status assessment parameter adjustment switching provided according to base station or cell reselection
The device of number of times, and, for determining mobile status the device of adaptive actual translational speed.
Compared with UE self-evaluation method, the solution that the present invention proposes has the advantage that
High reliability: Serving cell notifying cell type/cell size relevant information is used for reliable mobile state estimation.
Mobile robustness: switch failure or switching ping-pong phenomenon are significantly avoided.
Accompanying drawing explanation
The exemplary embodiment of the present invention is described below with reference to accompanying drawings.In the accompanying drawings, identical reference represents phase
Same or similar technical characteristic.
Fig. 1 illustrates in HetNet when UE is through the example of many small cell
Fig. 2 improves the assessment of UE mobile status according to UE in embodiments of the invention according to mobile status evaluation factor
Flow chart；
Fig. 3 is that PCI scope divides example according in embodiments of the invention；And
Fig. 4 is according in embodiments of the invention, base station and the functional block diagram of subscriber equipment.
Detailed description of the invention
The basic thought giving the application present invention individually below improves the embodiment of UE mobile status assessment.Merit attention
Be, although herein methods and apparatus of the present invention is described, so as a example by the base station eNB in LTE network and user equipment (UE)
And this is not restrictive.To those skilled in the art, on the basis of disclosed by the invention, basic by the present invention
Thought and spirit apply to the networks such as GSM/WCDMA, CDMA/CDMA2000 and WiMAX, equally realize the mobile shape strengthened
The community switching that state is assessed and improved in corresponding network.Therefore, the present invention at GSM/WCDMA/LTE, CDMA/CDMA2000 and
The networks such as WiMAX have the universal suitability.
1. mobile status evaluation factor
In the method, Serving cell sends mobile status evaluation factor a with auxiliary UE mobile status assessment.This factor can
Impliedly to identify Serving cell size or cell type.The span of a be (0,1], typically by current service cell from
Such as Operation and Maintenance controls the network entity of OMC node and obtains or obtaining with the mutual middle of other communities.
When UE receives shifter factor, it will correspondingly correct mobile status assessment.Such as, when carrying out according to below equation
During mobile status assessment, UE will increase switching or the number of times of cell reselection by evaluation factor.
Fn=Fn-1+a·1 (1)
Wherein FnIt is the quantity of the correction of the switching in current service cell or cell reselection, Fn-1It it is a upper service
Switching in community or the quantity of community selection, a is the evaluation factor sent.
If UE does not receive shifter factor, it will then carry out common mobile status evaluation process, will switch or
The number of times of cell reselection increases by 1.
Fn=Fn-1+1 (2)
Based on the quantity counted, UE determines and lays oneself open to any mobile status (at a high speed, middling speed, common) and according to UE speed
Degree regulation moving parameter.
Public by community or that UE is special message can indicate evaluation factor to UE.
As shown in the flowchart of figure 2, in step 201, it is judged that whether UE receives community specific mobile status assessment ginseng
Number.
If UE does not receives the no branch of community specific mobile status assessment parameter, i.e. step 201, then UE will be in step
Continue general evaluation process in 202, the most i.e. according to above equation (2), the number of times of switching or cell reselection is increased by 1.
If UE receives community specific mobile status assessment parameter, it is assumed that receive in this example embodiment is the mobile status factor
A, then continue step 207, and UE by increasing the quantity of correction according to above-mentioned equation (1) by switching or cell reselection quantity, to change
Kind mobile status assessment.
Based on the quantity counted, in step 211, UE determines that it is in which kind of state (at a high speed, middling speed, common) and adjusts
Moving parameter is with adaptive UE speed.Wherein, UE can regulate its moving parameter in the following manner, such as, for idle UE
It is biased to lagged value by increase or the UE Graph One factor for connecting regulates the ratio in TimeToTrigger (triggered time)
With adaptive actual translational speed, certainly, UE can also by regulate other any can the mobile ginseng of the actual translational speed of adaptation
Number is to realize the purpose of the present invention.
2. cell size/power notice
In the method, Serving cell can be to UE notifying cell size or cell power.Based on this information, UE can be certainly
Correct switching or the quantity of cell reselection mainly.
(1) cell size method:
Its cell size identifier can be sent to UE to move state estimation by Serving cell clearly, and community is big
Little can be in { big, in, little, the least }.When UE receives this notice, it by switching or cell reselection time
Number is adjusted with a ratio value or increases amount of bias.Scaled rule can be left UE for and enter according to suitable algorithm
OK.Form 1 gives the mapping table of radius of society and ratio value.In the table, ratio value takes 1,0.5,0.25 and 0.125 respectively
Four grades.To those skilled in the art, it is readily appreciated that in other cases, can use less or more
Ratio value.
| Radius of society | Greatly | In | Little | The least |
| Ratio value | 1 | 0.5 | 0.25 | 0.125 |
Table 1
(2) cell power method:
Its cell transmission power is sent to UE to move state estimation by Serving cell, and this provides more accurately still
Non-immediate cell size is measured.Such as, large cell launches power corresponding to large cell size.Permissible based on this message UE
The assessment of its mobile status is corrected by special algorithm.Similar with form 1, a kind of possible embodiment is that definition has community
Launch the function (or form) of power and variable to obtain such as the ratio value being similar to a in mobile status evaluation factor method.
When UE knows cell transmission power, it will perform bi-directional scaling according to suitable algorithm.Such as, at upper table
In, alternative cell size, cell transmission power and (0,1] in the range of ratio value between mapping relations may be used for correcting UE
Speed.
Use operating process and the mobile status evaluation factor method shown in Fig. 2 of cell size/cell power method
Similar, difference is that the parameter that UE receives is cell size/cell power rather than mobile status evaluation factor.Therefore, Fig. 2
Flow process proceeds to step 205, i.e. the map operation of UE radius of society to be carried out or cell transmission power to a ratio value.
In following step 209, UE will be able to switch according to the mode similar with equation (1) or cell reselection quantity increases
The quantity of correction up, to improve mobile status assessment.In this example embodiment, the value of ratio value is { 0.125,0.25,0.5,1}.
Based on the quantity counted, in step 211, UE determines that it is in which kind of state { at a high speed, middling speed, common } and adjusts
Moving parameter is with adaptive UE speed.Wherein, UE can regulate its moving parameter in the following manner, such as, for idle UE
It is biased to lagged value by increase or the UE Graph One factor for connecting regulates the ratio in TimeToTrigger (triggered time)
With adaptive actual translational speed, certainly, UE can also by regulate other any can the mobile ginseng of the actual translational speed of adaptation
Number is to realize the purpose of the present invention.
3.PCI scope divides
PCI (physical district ID) is to mark different communities on a physical layer, 504 PCI defined in current LTE,
Require to use in sufficiently large spatial separation, be unlikely to come from the information of the community with identical PCI so that UE receives.Mesh
Front PCI value and cell size do not have any relatedness.
In the PCI scoping approach that the present invention proposes, network reserves PCI value scope exclusively for the use of community.PCI
The division of scope can depend on different districts size.Such as, large coverage community can use high PCI value scope and little cover
Lid range cell can use low PCI value scope.PCI scope division information is sent to UE.Such as, PCI 0-199 is distributed
To the radius community more than 5 kilometers, PCI 200-399 distributes to the community that radius is 1 to 5 kilometer,
Shown in Fig. 3, a PCI scope divides example, and the lowest PCI value is assigned to the least coverage cell, and high
PCI value is assigned to large coverage community.Based on this information, UE can identify its Serving cell size, type correspondingly
Correct its switching or the quantity of cell reselection.When UE is Tong Bu with Serving cell and identifies PCI value, it can be directly based upon
PCI scope division information, or from the cell size of PCI scope division information identification Serving cell or cell type, accordingly
Ground correction UE mobile status.
The operating process using PCI scoping approach is similar with cell size/cell power method, except that,
The mobile status assessment parameter that base station (such as, eNB) provides is PCI value rather than cell size/cell power.Therefore, in step
In rapid 205, need to carry out being mapped to PCI value the operation of ratio value.
Fig. 4 is according in embodiments of the invention, base station (such as, eNB, NB etc.) and the functional block diagram of user equipment (UE).
Base station and user equipment (UE) according to the present invention can be repaiied by doing simple function on the basis of existing technology
Change.The signaling transmission of base station and user equipment (UE) can utilize existing signaling or existing signaling is added new message element,
Therefore, on the basis of disclosed by the invention, to those skilled in the art, it is achieved the base station of the present invention and user equipment (UE)
There is not particularly difficulty.
According to embodiments of the invention, in base station 401, the device for obtaining mobile status assessment parameter can be included
11, and the device 12 of the message including described mobile status assessment parameter, wherein, described mobile status is sent to subscriber equipment
Assessment parameter will be used to determine mobile status adaptive actual translational speed by described subscriber equipment.For obtaining mobile status
The device 11 of assessment parameter can be configured to from adjacent base station mutual obtain mobile status assessment parameter or from behaviour
Make to safeguard that controlling OMC node obtains mobile status assessment parameter, the shifting that these mobile status assessment parameter is such as mentioned above
The dynamic state estimation factor, radius of society, cell power and PCI value etc..Send to subscriber equipment and include described mobile status
The device 12 of the message of assessment parameter can add new message element by existing signaling or to existing signaling, and
The message sent includes that above-mentioned mobile status assesses parameter.
According to embodiments of the invention, subscriber equipment can include the mobile status assessment parameter for providing according to base station
Adjust switching or the device 21 of cell reselection number of times, and, for determining mobile status the device of adaptive actual translational speed
22.Device 21, in the case of receiving mobile status assessment parameter, will assess parameter according to mobile status directly or indirectly
For example with formula Fn=Fn-1+ a 1 increases switching or the number of times of cell reselection, wherein, FnIn current service cell
The quantity of the correction of switching or cell reselection, Fn-1It is the switching in a upper Serving cell or the quantity of community selection, such
In formula, a is mobile status evaluation factor.In other cases, by map operation obtain (0,1] in the range of ratio value with
Sample is applicable to the equation.Such as, mobile status assessment parameter is radius of society, cell power or PCI value, then this is moved shape
State assessment parameter is mapped to a ratio value, and proportionally value increases switching or the number of times of cell reselection.Device 22 will be according to cutting
Change/corrected value of cell reselection number of times determines actual translational speed and adjusts moving parameter with adaptive actual translational speed.
The method according to the invention and relevant device solve the assessment of UE mobile status to realize mobile Shandong in HetNet
Rod state estimation.Its unique distinction essentially consists in:
-consider that cell type/cell size information is assessed to strengthen UE mobile status, and it is next to propose multiple possible scheme
Solve this problem.
-PCI scope can be used to divide with based on cell size/cell type distribution PCI.
-this mechanism proposes to carry out some signaling exchanges between eNB and UE with the mobile robustness realizing in HetNet.This
A little signalings are easily detected.
-in the present invention, it is proposed that the UE mobile status evaluation mechanism of enhancing, this mechanism is for the mobility in HetNet
Reliability and the effectiveness of management are necessary.
It will be appreciated by those skilled in the art that the description carried out above by reference to accompanying drawing is all illustrative rather than to this
The restriction of the scope of invention.In the spirit and scope of the present invention being defined by the claims, those skilled in the art can set
Find out various amendment and variant.
Claims (7)
1. the method that the subscriber equipment in the coverage of assisted cell switches within a wireless communication network, the party
Method includes:
Base station from adjacent base station mutual obtain mobile status assessment parameter or from Operation and Maintenance control node OMC obtain
Mobile status assessment parameter, and,
Base station sends the message including described mobile status assessment parameter to subscriber equipment, in order to by described subscriber equipment according to institute
State mobile status assessment parameter determination mobile status adaptive actual translational speed,
Wherein said mobile status assessment parameter at least includes cell transmission power,
The function with cell transmission power and variable is wherein used to obtain a ratio value, and according to cell transmission power to being somebody's turn to do
The mapping relations of ratio value adjust the translational speed of subscriber equipment.
Method the most according to claim 1, if mobile status assessment parameter is mobile status evaluation factor a, then uses down
Formula increases switching or the number of times F of cell reselectionn=Fn-1+ a 1, wherein, FnIt is the switching in current service cell or community weight
The quantity of the correction of choosing, Fn-1It is the switching in a upper Serving cell or the quantity of community selection.
The most the method for claim 1, wherein corresponding to radius of society or cell type, PCI value is carried out scope division.
Method the most according to claim 1, if mobile status assessment parameter is radius of society, cell power or PCI
Value, then be mapped to a ratio value by this mobile status assessment parameter, and proportionally value increase switching or the number of times of cell reselection.
5. according to the method described in any one of claim 1-4, wherein said cordless communication network be GSM, WCDMA, LTE,
One of CDMA, CDMA2000, WiMAX network.
6. the base station that the subscriber equipment in the coverage of assisted cell switches within a wireless communication network, described
Base station includes:
For obtaining the device of mobile status assessment parameter, and,
Send the device of the message including described mobile status assessment parameter to subscriber equipment, wherein, described mobile status is assessed
Parameter will be used to determine mobile status adaptive actual translational speed by described subscriber equipment,
Wherein for obtain mobile status assessment parameter device be configured to from adjacent base station mutual obtain mobile shape
State is assessed parameter or obtains mobile status assessment parameter from Operation and Maintenance control OMC node,
Wherein said mobile status assessment parameter at least includes cell transmission power,
The function with cell transmission power and variable is wherein used to obtain a ratio value, and according to cell transmission power to being somebody's turn to do
The mapping relations of ratio value adjust the translational speed of subscriber equipment.
7. the subscriber equipment switched over by means of the base station in cell coverage area within a wireless communication network, this user
Equipment includes: for the mobile status assessment parameter adjustment switching provided according to base station or the device of cell reselection number of times, and,
For determining mobile status the device of adaptive actual translational speed,
Wherein, described mobile status assessment parameter be described base station from adjacent base station mutual obtain or from operation dimension
Protect and control what node OMC obtained,
Wherein said mobile status assessment parameter at least includes cell transmission power,
The function with cell transmission power and variable is wherein used to obtain a ratio value, and according to cell transmission power to being somebody's turn to do
The mapping relations of ratio value adjust the translational speed of subscriber equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110230786.2A CN102932865B (en) | 2011-08-12 | The mobile status appraisal procedure of subscriber equipment and equipment in cordless communication network | |
| PCT/IB2012/001887 WO2013024349A2 (en) | 2011-08-12 | 2012-08-13 | Method and apparatus for user equipment mobility state estimation in a wireless communication network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110230786.2A CN102932865B (en) | 2011-08-12 | The mobile status appraisal procedure of subscriber equipment and equipment in cordless communication network |
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| Publication Number | Publication Date |
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| CN102932865A CN102932865A (en) | 2013-02-13 |
| CN102932865B true CN102932865B (en) | 2016-12-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453770A (en) * | 2007-12-07 | 2009-06-10 | 华为技术有限公司 | Measurement control method and apparatus |
| WO2011013967A2 (en) * | 2009-07-27 | 2011-02-03 | Lg Electronics Inc. | Apparatus and method for determining mobility state in wireless communication system |
| CN102026309A (en) * | 2009-09-10 | 2011-04-20 | 大唐移动通信设备有限公司 | Method, system and device for detecting mobile state of terminal |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453770A (en) * | 2007-12-07 | 2009-06-10 | 华为技术有限公司 | Measurement control method and apparatus |
| WO2011013967A2 (en) * | 2009-07-27 | 2011-02-03 | Lg Electronics Inc. | Apparatus and method for determining mobility state in wireless communication system |
| CN102026309A (en) * | 2009-09-10 | 2011-04-20 | 大唐移动通信设备有限公司 | Method, system and device for detecting mobile state of terminal |
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Address after: 201206 Pudong Jinqiao Ning Road, Shanghai, No. 388 Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Pudong Jinqiao Ning Road, Shanghai, No. 388 Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |