CN102823300A - Method and device for performing cell selection - Google Patents

Method and device for performing cell selection Download PDF

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Publication number
CN102823300A
CN102823300A CN2010800649591A CN201080064959A CN102823300A CN 102823300 A CN102823300 A CN 102823300A CN 2010800649591 A CN2010800649591 A CN 2010800649591A CN 201080064959 A CN201080064959 A CN 201080064959A CN 102823300 A CN102823300 A CN 102823300A
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Prior art keywords
base station
low power
user equipment
downlink received
macro base
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CN2010800649591A
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CN102823300B (en
Inventor
杨峰
刘轶铭
徐斌阳
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The present invention provides a method and device for performing cell selection in a heterogeneous network. The heterogeneous network includes a macro base station and at least one low power base station, that is to say at least one low power base station is disposed in a macro cell covered by the macro base station. The method includes: measuring down link receiving power of the macro base station and the low power base station, extending the range of the down link receiving power of the low power base station by using an alterable offset, and selecting the base station which a user equipment will relate to according to the down link receiving power of the macro base station and the range-extended down link receiving power of the low power base station. In the present invention, adaptive adjustment of the offset enables more user equipments to relate to the low power base station, and enables the services of the macro base station and the low power base station to be better equalized, thus ensuring better service quality and maintaining better system performance.

Description

Method and device for performing cell selection
Perform the method and apparatus technical field of cell selection
This invention relates generally to radio communication, more particularly to the method and apparatus that execution cell is selected in heterogeneous network.Background technology
At present, LTE technologies are one of cutting edge technologies of wireless technical field.Base station in LTE network is commonly referred to as evolved node B, referred to as eNB.The conventional usual power of eNB is big, and wide coverage, cost is also high.In LTE deployment; in order to increase capacity, realizing more preferable Consumer's Experience and improve in-door covering rate etc.; generally also support to dispose one or more inexpensive low power base stations in conventional eNB coverage, such as miniature eNB (pico), family eNB (Femto) or relay station（Relay station), namely support isomery deployment.In isomery deployment, conventional eNB is commonly referred to as " grand for low-power eNB
", (macro) also referred to as macro base station or grand eNB.Grand eNB coverage is commonly referred to as macrocell.Low-power eNB is commonly referred to as " micro- for conventional eNB（Micro) ", also referred to as micro-base station or micro- eNB, low-power eNB coverage is commonly referred to as Microcell.In the context that the present invention is applied, base station and cell are corresponding.User equipment performs the cell selection namely corresponding base station of selection cell and is used as its serving BS.In other words, " selection will close the cell of connection ", " the selection base station to be associated " and " selection serving BS " has similar implication.
In existing system, the standard of execution cell selection typically uses family equipment UE and is connected to the cell with highest downlink link receiving power.There is considerable degree of imbalance in grand eNB transmission power and low-power eNB transmission power.For example, routine eNB transmission power normally about 43dBm, and Pico transmission power is typically to hold in the range of 23dBm -30dBm, Femto transmission power is typically smaller than 23dBm.As can be seen that, there is serious imbalance in grand eNB and low-power eNB transmission power difference more than lOdBm.So, using above-mentioned existing cell selection standard, the probability very little that UE selections are associated with low-power eNB.This deviates from disposing low-power eNB some original intentions.It can not such as realize Its ability by low-power eNB share partial service load, cell splitting (splitting) gain can not be obtained.Accordingly, it would be desirable to define a kind of new cell selection standard to enable more user equipmenies associated with low power base station, while remaining able to maintain systemic fi an ancient type of spoons b.
In order that more user equipmenies are associated with low-power eNB, it is proposed that a kind of range expansion technique.In the range expansion technique, cell selection standard can be expressed as following formula (1), and it is not to select serving BS according to maximum RSRP, and is the introduction of propagation △:
CellID = argmax{RSRP(. + Δ,.} ( 1 )
i
Wherein, CellIDIt is selected Cell Identity CI, i represents that candidate cell is identified, each one base station of candidate cell i correspondences.RSRP (Reference Signal Receiving Power) is Reference Signal Received Power, and it can characterize downlink received power.RSRPi is used for indicating cell i downlink received power, the i.e. downlink received power from the corresponding base station i of cell i.Ai is the propagation applied to cell i, and propagation △ is generally used for Microcell, and such as bright cell i is macrocell, then friendship Δ is set to zero.In such as formula（1) in the cell selection standard described in, low-power eNB (corresponds to Microcell）RSRP there is positive offset, which raises user equipment selection low-power eNB as its serving BS probability.Then, more user equipmenies can be associated with low-power eNB, and obtain cell splitting
(splitting) gain.
However, above range expansion technique existing defects.In above range expansion technique, the propagation Δ of each Microcell is constant.Propagation △ may be suitable for certain situation, but not adapt to different situations.If the propagation sets improper, its by reduce system performance.For example, when setting excessive, having excessive user equipment associated with low-power eNB.However, the receiving power from grand eNB is much larger than the receiving power from low-power eNB, user equipment originally can select grand eNB to obtain more preferable service.But when △ sets excessive, user equipment is forced to select associated with low-power eNB, result in the decline of overall performance.System-level emulation has been verified that this hydraulic performance decline.Therefore, problem present in above-mentioned cell selection can not be solved well using the range expansion technique of constant propagation. The content of the invention
It is an object of the invention to provide a kind of new cell selecting method and device, it enables to more user equipmenies associated with low power base station, while remaining able to maintain systematic function.
According to the first aspect of the invention there is provided a kind of method that cell selection is performed in heterogeneous network, the Yi Gou Wang Network include macro base station and at least one low power base station, and the respective cell of each base station correspondence, methods described includes：Measure macro base station and the downlink received power of low power base station, enter line range using variable offset come the downlink received power to low power base station to extend, the base station that the downlink received power based on macro base station selects user equipment to be associated with the downlink received power of the low power base station extended through scope.
According to a preferred embodiment of the present invention, the variable offset is adaptively adjusted according to one or more factor.Preferably, the variable offset can adaptively be adjusted according at least one in following factor：The difference of macro base station and the downlink received power of low power base station；The business load of macro base station；The business load of low power base station；And with the translational speed of families equipment.
According to the second aspect of the invention there is provided a kind of device that cell selection is performed in heterogeneous network, the heterogeneous network includes macro base station and at least one low power base station, and the respective cell of each base station correspondence, described device includes：Measurement module, downlink received power for measuring macro base station and/or low power base station, scope expansion module, extended for entering line range using variable offset come the downlink received power to low power base station, selecting module, the user equipment base station to be associated is selected for the downlink received power based on macro base station with the downlink received power of the low power base station extended through scope.
Preferably, the device further comprises adaptive adjusting module, for being adaptively adjusted the variable offset according to one or more factor.
According to the third aspect of the invention we, additionally providing a kind of includes the user equipment of device according to the second aspect of the invention.Brief description of the drawings
Made by reading with reference to the non-limiting example to the present invention that the following drawings is made Detailed description, it is of the invention more than and other features, objects and advantages will become more apparent：
Fig. 1 shows the schematic diagram for the example that can apply the heterogeneous network 100 of the present invention wherein；
Fig. 2 shows the flow chart of the process 200 selected according to the execution cell of the specific embodiment of the present invention；And
Fig. 3 shows the schematic block diagram for being used to perform the device 300 of cell selection of a specific embodiment according to the present invention.
In accompanying drawing, same or similar reference represents same or similar part.Embodiment
Hereinafter, method, device and user equipment refer to the attached drawing selected the execution cell of the present invention by exemplary embodiment is described in detail.Following examples are illustrated by taking LTE wireless networks as an example.Person of ordinary skill in the field should be understood that the present invention is not limited to LTE environment, but can apply to the wireless network of any support isomery.
Fig. 1 shows the schematic diagram of the example for the heterogeneous network 100 that can apply the LTE of the present invention wherein.One or more macro base stations are deployed in network 100.In the coverage of at least one macro base station（Macrocell）One or more low-power eNB are inside also deployed, the low-power eNB can be relay station（Relay), micro- eNB (pico) or family eNB (Femto).This deployment is referred to as isomery deployment, therefore Wang Network 100 are also referred to as heterogeneous network.It should be appreciated that, it is not required that all dispose low power base station in the coverage of all macro base stations in different structure net Network.For convenience of description, a grand eNB 101, and relay station eNB 102, micro- eNB (pico) 103 and the family eNB (femo) 104 disposed in grand eNB 101 coverage are illustrate only in Fig. 1.ENB 101,102,103 and 104 coverage is denoted as cell 1, cell 2, cell 3 and cell 4, and wherein cell 1 is macrocell, and cell 2-4 is i, area.In the network 100, in addition to multiple user equipmenies, UE 201, UE 202, UE 203 are for example shown in Fig. 1.User equipment (UE) 201, UE 202, UE 203 can be the equipment of mobile phone, the portable computer or personal digital assistant of support radio communication, and/or other support radio communications.These user equipmenies will be serviced, and be needed Base station is wanted to provide it service.So user equipment needs to perform cell selection, to select a base station to be associated.Associated base station is referred to as the serving BS of the user equipment.Those skilled in the art should forgive understanding, and user equipment needs to perform cell selection in start, in environmental change, it is also desirable to which gravity treatment performs cell selection（Sometimes cell selection in this case is also referred to as cell reselection）With gravity treatment selection more suitably serving BS.Note, the cell selection mentioned in this application includes cell reselection.
Understanding should be forgived, network 100 is only illustrative, it can include macrocell and any heterogeneous network of Microcell.The present invention is also not limited to LTE technologies, but can apply to other technologies for supporting isomery.
Below, consider first in Yi Gou Wang Network 100 using conventional cell selection standard（I.e. user equipment is alternatively coupled to the cell with highest downlink link receiving power）Situation.Because grand eNB 101 transmission power is much larger than low-power eNB 102,103 or 104 transmission power.Therefore, user equipment, such as UE 201,202 or 203, RSRPi (i=1,2,3 measured, 4, correspond respectively to cell label 1-4) in correspond to grand eNB 101 downlink RSRP 1 by much larger than other RSRP i (i=2,3,4) of the downlink corresponding to Microcell.Then, all UE201,202 and 203 will all be alternatively coupled to grand eNB 1010In this case, low power base station eNB 201,202 and 203 can not share business load, and network 100 can not obtain cell splitting gain.
Secondly, it is considered to which heterogeneous network 100 is used such as above-mentioned formula（1) situation of the cell selection standard of the range expansion technique described in.As shown in figure 1, UE 202 is located at the vicinity of the eNB 104 in eNB 101 coverage.Preferably, UE 202 should read to be associated with eNB 104.In view of grand eNB 101 transmission power is much larger than eNB 104 transmission power, and UE 202 is located relative to eNB 104 close eNB 101 side, so the downlink RSRP for the eNB 101 that UE 202 is received！Downlink RSRP than eNB 1044Big is more.In this case, it is necessary to increase larger propagation △ to the corresponding cells 4 of eNB 1044(wherein △ subscript corresponds to cell label）The RSRP^ A^RSRP at UE 202 could be caused, so that UE 202 can be alternatively coupled to eNB 104.But, device for carrying a tripot propagation ^4 is probably inappropriate for other users equipment.For example, it is configured excessive for UE 203 cell selection so that UE 203 can not select suitable cell.UE 203 is located at Microcell 4 Edge, eNB 104 transmission power is much smaller than eNBlOl transmission power again, so the downlink RSRP' of the Microcell 4 at UE 2034Much smaller than macrocell 1 downlink RSRP preferably, UE 203, which should forgive, is associated with eNB 101.But because propagation 4 is configured larger, the downlink RSRP' of the measurement at UE 2034And RSRP', also meet RSRP'4+A4>RSRP', so that UE 203 is adversely alternatively coupled to eNB 104.UE 203 can not obtain good service, and it reduce systematic function.On the other hand, if the propagation of cell 4 is set into relatively low value so that UE 203 will not be alternatively coupled to eNB 104, it may cause UE 202 to be no longer attached to eNB 104 again, and this is equally undesirable.
Therefore, network 100 needs to use a kind of cell selection mechanism to overcome above mentioned problem.The invention provides a kind of cell selection mechanism for being adapted to use in heterogeneous network 100, it extends Microcell using variable offset.In the present invention, can be adaptively adjusted according to the various factors X of consideration offset Δ (x).Preferably, can be according to the difference of macro base station and the downlink received power of low power base station in the cell selection mechanism of the present invention；The position of user equipment；The business load situation of macro base station and/or low power base station；And/or the translational speed of user equipment etc. factor, offset △ (Xj) is adaptively adjusted, wherein j represents the index of various factors.The cell selection mechanism of the present invention can for example pass through following formula（2) schematically show：
CellID=argmaxlRSRP ,+Δ () } (2) wherein, Ai (χ) can be dynamically adjusted according to different factors.In the cell selection standard, the present invention not only allows for downlink received power level, and considers load balancing, fairness, switching frequency, etc..
In general, by the present invention in that entering line range extension to Microcell with the offset adaptively adjusted, user equipment can select optimal serving cell, so that net Network overall performance reaches most preferably.In other words, the problem of existing instant invention overcomes prior art, can enable more user equipmenies associated with low power base station, while remaining able to maintain systematic function.
Below with reference to Fig. 2, it is described in detail how that the cell for performing the present invention performs method.In the following description, mainly illustrated by taking user equipment (UE) 202 as an example.
Fig. 2 shows the process selected according to the execution cell of the specific embodiment of the present invention 200 flow chart.
Because the polytropy of LTE mobile environment（Such as user equipment may be moved to diverse location every now and then, or influenceed by other users equipment etc.）, user equipment can regularly perform the cell selection procedure of the present invention to select more suitably serving BS.Alternatively, when the signal for detecting the up-link from user equipment in current serving BS is less than some threshold value, base station can also indicate that user equipment carries out cell reselection, and then user equipment can perform the cell selection procedure of the present invention in response to the instruction of base station.
In step S202, user equipment such as UE 202 measures the downlink received power level of each base station.User equipment generally only measures the downlink reference signal receiving power RSRP of each base station.For example, the downlink RSRP of the downlink RSRP Microcells 2-4 of the measurement macrocells 1 of UE 2022 - RSRP4。
It should be understood that in the present invention in addition to characterizing downlink received power using RSRP, it is also an option that other specification well known in the art characterizes downlink received power.For example, it is used as replacement, RSRQ (Reference Signal Receiving Quality can be used, Reference Signal Received Quality) characterize downlink received power, wherein RSRQ is RSRP and RSSK Received Signal Strength Indicator, received signal strength indicator）Ratio.In this case, in step S202, user equipment also measures RSSI.Is moreover, it should be understood that user equipment and need not measure the downlink received power level of all base stations.Preferably, a threshold value can be set, only consider higher than the cell forgived corresponding to the downlink received power level of threshold value can as serving cell candidate.Can be without measurement to the downlink received power less than the threshold value.In the example depicted in figure 1, UE 202 is outside eNB 102 and eNB 103 coverage, and the downlink received power level of the cell 2 and 3 received is very small, therefore can not measure RSRP2And RSRP3.Then, UE 202 can only consider cell 1 and 4 when performing following step.
Due to not only considering receiving power level in the present invention, it is also contemplated that other factors.Under different consideration situations, in order to obtain the corresponding physical parameter of considered factor, user equipment is also needed to carry out other measurements, or the additional information needed is received from base station.For convenience of description, in the example shown in Fig. 2, receiving power level is not only allowed for, it is also contemplated that load balancing and cell switching frequency between the difference between receiving power level, base station.. In order to obtain the information of correlation, user equipment such as UE 202 alternatively performs step-S204, and UE 202 receives the business load state instruction of base station in this step.Can only consider the business load state ι of macrocell 1 in cell selection procedure 200, or only consider the business load state of Microcell 4/4, both can also be considered simultaneously.UE 202 can correspondingly receive corresponding eNB (eNB 101 or eNB 104, or both）Business load shape know instruction/, and/or/4.The business load state instruction of base station can be regularly sent to all user equipmenies in its coverage by base station by broadcast channel.Alternatively, base station can in response to user equipment request, user equipment specific channel send forgive business load state instruction.
Alternatively, user equipment such as UE 202 also performs step S206, and UE 202 measures the translational speed of its own in this step.The translational speed of user equipment is related to switching frequency, when the translational speed of user equipment is very fast, in its possible short time（For example in a communication process）Multiple different cells are passed through, it is possible to continually carrying out cell switching, the quality of call are influenceed.In this case it is necessary to avoid unnecessary cell reselection/switching.
It should read to understand, step S204 and S206 are alternatively rather than necessary.As an alternative or supplement, UE 202 is it is also conceivable to the factor such as position, so as to need to carry out position measurement, or receives from base station related positional information.
Then, in step S208, UE 202 is adaptively adjusted the variable offset of the scope extension for low power base station according to different factors.The main translational speed for considering receiving power difference, business load and user equipment in embodiment, then Microcell i from the offset for adapting to adjustment can be designed as：
Δ;(/, RSRP, vUE) = C ^ w^ , (/) + w2A; (RSRP) + w3 * β{νυΕ) (3) wherein, C is constant；Be based on the business load state instruction on the corresponding low power base station eNB of Microcell i/offset adjustment component, A(RSRP)It is the offset adjustment component based on the downlink RSRP differences between Microcell i macrocells corresponding with grand eNB, D is the translational speed v based on user equipmentueOffset adjustment component, and (j=1,2,3) represent weight coefficient.
"'(/) business load state on the low power base station eNB (for example, eNB 104) that is based on/can be simply with the business load state instruction on the low-power eNB received in step S204（For example/4) represent.Preferably, on low power base station eNB business is born Load state/can be is, for example, relative to the relative business load condition instruction of macro base station4/ .Adjust component " '(/)The business load that can be used between balanced low power base station and macro base station.When the business load in the corresponding low power base stations of Microcell i/heavier, " ^) become smaller, to reduce the number of the user equipment associated with Microcell i.When the business load in the corresponding low power base stations of Microcell i/lighter, become larger, to increase the number of the user equipment associated with Microcell i.In this way it is possible to the business load between balanced macro base station and low power base station.Understanding should be forgived, can be designed in a variety of ways " ', all functions for meeting above-mentioned logical relation may be used to represent " ' (0.For example " can be simply business load inverse proportion function, " ' can also be and be fitted obtained function for meeting above-mentioned logical relation, etc. according to test and/or emulation knot are bright.
Adjust componentΔ' (RSRP)The downlink received power for compensating for macro base station and low power base station is poor.When macro base station and the smaller downlink received power of low power base station difference, it may indicate that user equipment is in the edge of macrocell and close to low power base station（I.e. in the immediate vicinity of Microcell）.In this case, selection low power base station is more efficient as serving BS.For this A (RSRP) can be configured to it is larger, to improve the probability that user equipment is associated with low power base station.On the other hand, if the downlink received power difference of macro base station and low power base station is larger, namely macro base station downlink received power be much larger than low power base station downlink received power, then select macro base station it is more suitable as serving BS.Therefore,A'(RSRP) it can be arranged to smaller.In this way, macro base station can be compensated during cell is selected and the downlink received power of low power base station is poor.It should be understood that can design in a variety of waysA'(RSRP), all functions for meeting above-mentioned logical relation may be used to representA'(RSRP).Such as A (RSRP) can be the poor inverse proportion functions of the RSRP,RSRP the function for meeting above-mentioned logical relation obtained according to test and/or simulation result fitting, temple etc.) be can also be.
Adjustment component ^) it can be used for the execution frequency that control cell is selected.If the speed V of user equipmentUEIt is larger, then it may cause frequently cell selection/switching.This can increase signaling consumption, and the service quality QoS that user equipment is obtained may also be adversely affected.In order to avoid frequently cell selection/switching, adjustment component can be set to the speed V with user equipmentUEChange is smaller greatly.Thus, by the suitable adjustment component ^ of design), User equipment continually will not switch between macro base station and low power base station.It should be understood that D can be designed in a variety of ways, all functions for meeting above-mentioned logical relation may be used to represent D.Such as D can be the speed V of user equipmentUEInverse proportion function, D can also be according to test and/or the obtained function for meeting above-mentioned logical relation of simulation result fitting, etc..
Each weight coefficient W " can be used for adjusting influence of the corresponding adjustment component to total drift amount, so that desired design object is better achieved.
Above-mentioned formula（3) the offset design of the adaptive adjustment of the Microcell i described in is only for the purpose illustrated rather than limits the invention to the particular form.According to foregoing description, those skilled in the art can contemplate more or less factors to be adaptively adjusted the offset △ (x) of the scope extension for Microcell.
Then, in step S210, enter line range to Microcell i downlink received power using variable offset Ai (X) and extend.Although being extended for macrocell without scope, macrocell can be considered as to the scope extension for having carried out that offset is 0.Thus it is possible to be directed to each candidate cell i respectively, the downlink received power after being extended through scope, such as RSRP'i-RSRPi+A (x) are calculated.
Then, in step S212, downlink received power that can be based on macro base station and the Microcell extended through scope（Corresponding to low power base station）Downlink received power come the base station that selects user equipment to be associated.Below, continue to illustrate by taking UE 202 as an example.For simplicity, UE202 mainly considers candidate cell 1 and 4, as above mentioned in step S202.Before step S212, UE202 has been obtained for the downlink RSRP of macrocell 1, and Microcell 4 downlink RSRP4+A4( x).In step S212, UE 202 can be according to formula（2) from candidate cell（I.e. cell 1 and 4) in selection the cell to be associated.If RSRP^RSRi^+A^x), UE 202 will select RSRP, corresponding cell 1 is associated with macro base station 101 as serving cell, namely selection.Such as bright RSRPi<RSRP4+A4 (X), then UE202 will select RS P4Corresponding cell 4 is associated with low-power macro base station 104 as serving cell, namely selection.There is more than 2 candidate cells Ru bright, then user equipment can be according to upper:State formula（2) similarly select it is expanded after The cell corresponding to maximum in (χ) is to be associated.So far, Process 200 terminates.
Hereafter, user equipment may be coupled to selected cell, and this can be realized with various existing or exploitation in the future technology.Because it is unrelated with the main points of the present invention, it will not be repeated here.
The cell selecting apparatus of the present invention is described in detail with reference to Fig. 3.
Fig. 3 shows the schematic block diagram for being used to perform the device 300 of cell selection of a specific embodiment according to the present invention.
The cell selecting apparatus of the present invention includes：Power measurement module 302, the downlink received power for measuring macro base station and/or low power base station；Scope expansion module 310, extends for entering line range using variable offset come the downlink received power to low power base station；And selecting module 312, select the user equipment base station to be associated with the downlink received power of the low power base station extended through scope for the downlink received power based on macro base station.
Power measurement module 302 is typically configured as measuring the RSRP of downlink.In the present invention in addition to characterizing downlink received power using RSRP, it is also an option that other specification well known in the art characterizes downlink received power.Then, power measurement module 302 is also arranged to measure other related power parameters.For example, as RSRP replacement, RSRQ can be used to characterize downlink received power, it is RSRP and RSSI ratio.In this case, power measurement module 302 is additionally configured to measure RSSI.
Scope expansion module 310 enters line range come the downlink received power to low power base station using the variable offset according to the present invention and extended.If characterizing downlink received power using RSRP, it can be calculated respectively for each candidate cell i after being extended through scope ( x) if downlink received power is characterized using RSRP, each candidate cell i can be directed to respectively, after calculating extends through scope
RSRQ' RS Qi+Δ; ( χ )0It need not be extended when candidate cell is macrocell, but can also similarly carry out the scope that offset is 0 and extend.So as to can uniformly treat macrocell and Microcell in selecting module 312.
The downlink received power extended through scope of selection with maximum generally from candidate cell of selecting module 312（For example, maximum RSRPi, or maximum RSRQ'i) that is small Area is to be used as its serving cell.Extended if macrocell is regarded as and have passed through the scope that offset is 0, selecting module 312 can be uniformly ranked up based on the downlink received power extended through scope by order from big to small to all candidate cells, the cell of selected and sorted first.Or selecting module 312 can distinguish macrocell and Microcell, the Microcell and macrocell of candidate are ranked up respectively first, then the downlink received power of sort first Microcell and the macrocell of sequence first is compared, to select the corresponding cell of the greater in the two.It should be understood that known any ordering mechanism can be used in the present invention, it will not be repeated here.
Preferably, device 300 also includes receiving module 304.Receiving module 304 may be configured to receive instruction and/or the information of base station.Device 300 can regularly perform cell selection, or in response to the instruction of base station come perform cell selection.In the later case, reception device 304 needs to receive the instruction for performing cell selection from base station.
Preferably, receiving module 304 can also be configured to receive the other information that base station is sent to user equipment, for example, adjust the various parameters of the variable offset extended for scope.Base station can send these information by broadcast channel, can also be transmitted in response to the request of user equipment by the channel of user equipment specific.
Preferably, device 300 also includes other measurement modules, and such as measurement adjustment is used for the required various parameters for the variable offset that scope extends.For example, device 300 can include speed measurement module 306, the translational speed for measuring user equipment.
Preferably, device 300 also includes adaptive adjusting module 308, it ties the various parameters that bright and/or receiving module is received according to the measurement of power measurement module 302 and/or other measurement modules, is adaptively adjusted the offset extended for scope.As being described in detail with reference to Fig. 2, according to the present invention, variable offset can be according to the difference between such as receiving power level, and the business load situation of base station and the translational speed of user equipment etc. various factors enter Mobile state adjustment.It will not be described in detail herein.
It should be understood that the module shown in device 300 is only illustrative, it can also include more modules.For example, sending module can also be included in device 300, for sending user's request；And/or computing module, etc..On the other hand, device 300 can also omit one or more modules shown.For example, in the speed without the concern for user equipment, it is convenient to omit module 306. The device 300 of the execution cell selection of the present invention can be located in user equipment, be used as a part for user equipment.Device 300 can also be located in the other equipment being connected that can be communicated with user equipment.
The mechanism of the executions cell selection of the present invention not only allows for receiving power level by the offset that adaptively adjusts of design, it is also contemplated that load balancing, cell switching frequency between base station etc..It may insure that user equipment is associated with optimal cell.While causing more user equipmenies to be connected to low power base station, it is ensured that the QoS of service, and improve the entire throughput of network.
Above in association with LTE isomerous environment, the present invention is described.It should be understood that present invention can also apply to the environment that other support isomery, such as WiMax etc..Embodiments described above is exemplary, rather than restricted.Each step enumerated is not essential, and its order is nor restricted.For example, according to the actual needs, the method that can customize cell execution increases or deletes some steps.Above-mentioned steps can be either executed in different order or some steps can be performed in parallel.Equally, the device and user equipment that are used to perform cell selection enumerated can also include more or less units.
It should be noted that in order that the present invention is easier to understand, it is more specifically some ins and outs that are known and being likely necessary for realization of the invention for those skilled in the art that above description, which is eliminated,.
The purpose for providing the specification of the present invention is in order to illustrate and describe, rather than for exhaustive or limit the invention to disclosed form.To those skilled in the art, many modifications and changes will be apparent from.It should also be realized by those skilled in the art that can be by way of software, hardware, firmware or their combination, to realize the method and apparatus in the embodiment of the present invention.Hardware components can be realized using special logic；Software section can be stored in memory, by appropriate instruction execution system, and such as microprocessor, computer or large scale computer are performed.
Therefore; it should be appreciated that; select and describe embodiment be in order to preferably explain the present invention principle and its practical application; and understand those of ordinary skill in the art; on the premise of essence of the present invention is not departed from, all modifications and change are each fallen within protection scope of the present invention defined by the claims.In the claims, word " including " is not excluded for other elements and step And wording " one " is not excluded for plural number suddenly,.In the practical application of invention, the function of cited multiple technical characteristics in the possible perform claim requirement of a part.Any reference in claim should not be construed as the limitation to scope.

Claims (1)

  1. Claims
    1. a kind of method that cell selection is performed in heterogeneous network, the heterogeneous network includes macro base station and at least one low power base station, the respective cell of each base station correspondence, methods described includes：
    Macro base station and the downlink received power of low power base station are measured,
    Enter line range using variable offset come the downlink received power to low power base station to extend,
    The base station that downlink received power based on macro base station selects user equipment to be associated with the downlink received power of the low power base station extended through scope.
    2. according to the method described in claim 1, the variable offset is at least one in following factor adaptively to adjust：
    The difference of macro base station and the downlink received power of low power base station；
    The business load of macro base station；
    The business load of low power base station；And
    The translational speed of the user equipment.
    3. method according to claim 2, wherein the adaptive adjustment includes：The difference of the macro base station and the downlink received power of low power base station is smaller, and the offset is arranged to bigger.
    4. according to the method in claim 2 or 3, wherein the adaptive adjustment includes：The business load of the macro base station is bigger and/or business load of the low power base station is smaller, and the offset is arranged to bigger.
    5. according to the method in claim 2 or 3, wherein the adaptive adjustment includes：The translational speed of the user equipment is faster, and the offset is arranged to smaller.
    6. according to the method described in claim 1, wherein methods described is periodically executed.
    7. according to the method described in claim 1, wherein methods described is carried out according to the instruction of serving BS.
    8.-kind of the device that execution cell is selected in heterogeneous network, the heterogeneous network includes macro base station and at least one low power base station, the respective cell of each base station correspondence, described device includes： Measurement module, the downlink received power for measuring macro base station and/or low power base station,
    Scope expansion module, extends for entering line range using variable offset come the downlink received power to low power base station,
    Selecting module, the user equipment base station to be associated is selected for the downlink received power based on macro base station with the downlink received power of the low power base station extended through scope.
    9. device according to claim 8, further comprises adaptive adjusting module, the variable offset is adaptively adjusted at least one in following factor：The difference of macro base station and the downlink received power of low power base station；
    The business load of macro base station；
    The business load of low power base station；And
    The translational speed of the user equipment.
    10. the device according to claim 9, wherein the adaptive adjusting module is configured to：The difference of the macro base station and the downlink received power of low power base station is smaller, and the offset is arranged to bigger.
    1 1. device according to claim 9 or 10, wherein the adaptive adjusting module is further configured to：The business load of the macro base station is bigger and/or business load of the low power base station is smaller, and the offset is arranged to bigger.
    12. the device according to claim 9 or 10, wherein the adaptive adjusting module is further configured to：The translational speed of the user equipment is faster, and the offset is arranged to smaller.
    13. the device according to claim 8, wherein described device regularly perform base station selected.
    14, the device according to claim 8, wherein described device perform base station selected in response to the instruction of serving BS.
    15.-kind of user equipment, it includes the device described in any one in claim 8-14.
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