CN105323829A - Cell selection method, cell selection device, base station and terminal - Google Patents
Cell selection method, cell selection device, base station and terminal Download PDFInfo
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- CN105323829A CN105323829A CN201410375093.6A CN201410375093A CN105323829A CN 105323829 A CN105323829 A CN 105323829A CN 201410375093 A CN201410375093 A CN 201410375093A CN 105323829 A CN105323829 A CN 105323829A
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Abstract
The invention discloses a cell selection method, a cell selection device, a base station and a terminal, wherein the method comprises the following steps: obtaining the switch type and the switch frequency of a terminal; judging whether a cell reselection parameter for reducing the switch frequency is adjusted or not according to the switch type and the switch frequency; if so, adjusting the cell reselection parameter; and sending the adjusted cell reselection parameter to a service base station of the terminal, such that the service base station performs cell selection. By means of the invention, the problem that the stability for accessing the terminal to a cell cannot be ensured in the related technology can be solved; the terminal can select an optimal cell to access by adjusting the cell reselection parameter; therefore, the switch frequency of the terminal is reduced; and the continuity and the stability for accessing the terminal to the cell are ensured.
Description
Technical field
The present invention relates to the communications field, a kind of method selected in particular to community, device, base station and terminal.
Background technology
Heterogeneous network (HeterogeneousNetwork, referred to as HetNet) refer at original macro station NodeB (MacroNodeB, referred to as MNB) add low power base station (LowPowerNodeB in the macrocellular network that formed with service terminal, referred to as LNB), wherein, LNB comprises Micro and Femto, and terminal, according to the position of self, carries out the network selected with receiving the parameter adaptives such as the power of two base station signals in access MNB and LNB.MNB and LNB can as the serving BS of terminal, and due to LNB can supplementing as MNB, share the burden of MNB, fill up the coverage hole of MNB, heterogeneous network often has higher capacity and better coverage effect.LTE/LTE-AHetNet and HSPAHetNet experienced by comparatively ripe discussion, and has had many quite ripe achievements in research.Introduce HetNet and will bring a lot of potential problems, up-downgoing unbalanced and between the interference problem brought and base station laod unbalance problem be exactly focus wherein.
In traditional homogeneous network, the transmitting power of each base station is identical, and terminal selects serving BS according to the descending pilot frequency power level received, and there will not be the unbalanced problem of up-downgoing.Fig. 1 is super-intensive network design (UltraDenseNetwork in correlation technique, referred to as UDN) schematic diagram disposed, as shown in Figure 1, in the region of a macro base station service, have the region of a lot of micro-base station service, and micro-base station likely there is different kinds, such as SmallCell, generally, SmallCell comprises Pico, Micro, Femto etc., and we are referred to as low power transmissions base station (LNB).In heterogeneous network, owing to introducing the LNB that transmitting power and MNB differ greatly, on down direction, the transmitting power of each base station is no longer the same, and up direction is all the power that receiving terminal is launched, so descending covering border is closer to LNB, and up covering border is the centre of MNB and LNB.Therefore best up handoff boundary and the descending handoff boundary of the best have no longer overlapped, and we are called up-downgoing mismatch (UL-DLmismatch) this.In network before, general terminal up-downgoing data are served by a base station simultaneously, and the selection of Serving cell is also the pilot signal strength based on each base station down, thus will occur terminal from LNB very close to, but the situation of being served by MNB.This is by poor for the service causing the uplink of this terminal to obtain.
Fig. 2 is the schematic diagram of 3dBCIO in heterogeneous network system in correlation technique, as shown in Figure 2, after adding 3dBCIO, 3dB is moved to macro station in descending covering border, and macro base station coverage reduces, and a part of terminal is unloaded on micro-base station, and, along with descending covering border is moved to macro base station, the edge termination transmitting power of macro base station reduces, and decreases the energy consumption of terminal in whole system.UDN refers to and arrange a large amount of micro-base stations in the scope of macro base station, and the quantity of micro-base station can reach the rank of hundreds of LNB within the scope of a MNB under normal circumstances.UDN will greatly promote the capacity of whole network.And because the average transmit power of base station diminishes greatly, the capacity of each base station and before homogeneous network remain basically stable, so energy utilization rate will promote greatly in UDN.UDN is also by all standing in good Deterministic service region simultaneously, substantially there will not be and covers dead angle.Based on these advantages above, UDN is confirmed as one of key technology of 5G technology.
In UDN, macro base station difference also can bring up-downgoing unbalanced with micro-base station transmitting power, simultaneously also may with serving other impact.
When the quantity of micro-base station is not many time, when namely having tens LNB in each MNB, distance between LNB is probably the scope of 50m-100m, at this time substantially all surrounded by the overlay area of MNB from the overlay area of a LNB, namely a terminal transfers to another one LNB coverage from the coverage of a LNB, also will through the overlay area of MNB.Like this when fast mobile terminal time, will ceaselessly switch between micro-base station and macro base station with high-frequency, especially when moving velocity of terminal is higher.High-frequency switching like this may cause signaling storm.
When micro-number of base stations increases, reach in each MNB when having hundreds of LNB, the distance between LNB is probably in the scope of 20m-50m.At this time micro-base station is all be close to micro-base station substantially.Even have also appeared the extruding between micro-base station, namely at boundary, the down-bound pilot frequency signal intensity of multiple LNB is better than the down-bound pilot frequency signal intensity of MNB.Fig. 3 is the schematic diagram of the micro-base station extruding occurred in UDN in correlation technique, as shown in Figure 3, when base station density micro-in UDN is enough time, the border between micro-base station is close together, namely the border of micro-base station is no longer the line of demarcation of micro-base station and macro base station, but the line of demarcation between micro-base station.Can realize the complete in micro-base station coverage of one piece of region like this, and reduce the switching times of LNB-MNB-LNB in a large number, thus raising system is energy.Black line between LNB is exactly the handoff boundary after the extruding of micro-base station, and on this line, the downstream signal intensity of two LNB is all better than MNB.In time occurring in system that a large amount of community extrudes, illustrate that the quantity of LNB in this system is a lot, a large amount of region is covered by LNB, and the interference between micro-base station is comparatively serious, needs the technology adopting some inter-cell interference cancellation.Under the scene of so intensive micro-base station distribution, the role of MNB will change, and become secondary serving base station from the main services base station HSPA and LTE heterogeneous system.Namely in terminal due to when disturbing excessive or other reason cannot be served by LNB, MNB serves as serving BS.That is, in UDN, LNB primary responsibility hoist capacity, MNB primary responsibility ensuring coverage.
Meanwhile, for different business, the best server cell choice criteria between LNB and MNB is also distinguishing.In general, speech business is born by MNB, to reduce switching times as far as possible.And need to take ample resources as data service is that, allow LNB serve as far as possible.
Affect relevant to business factor, the loading condition of minizone.Terminal is when selection best server cell, and existing cell load is also a very important factor, needs the scope being included into consideration.Wherein, preferential LNB service terminal is also the reason considering loading condition between a part of base station.Meanwhile, not only between MNB and LNB, between LNB, terminal is tended to be served by more idle base station.
In addition, also need to consider ambulant factor.The terminal of high-speed mobile, the terminal in such as high ferro, if be linked in micro-base station, out, not only will soon can not bring the lifting of throughput, also can produce the signaling of a large amount of switchings and gravity treatment Serving cell on the contrary, very inadvisable.The slower terminal of general speed, as the car-mounted terminal in city, also selection is had to the access of micro-base station, general can be accessed micro-base station that signal is very strong, service area is larger, stronger micro-base station signal can be received first, second receive micro-base station signal stronger time the path of terminal in micro-base station longer.For slower terminal, i.e. walking or static terminal, then dock base station in a subtle way and do not limit.
Another one needs the factor considered to be closed group (CSG) community, i.e. the community of sub-clustering, in general, the Cu Nei community that terminal all can pay the utmost attention to place, Serving cell switches.
In UDN, the factor that has an impact may be selected as follows to Terminal Service community: the downstream signal intensity that terminal receives, the uplink signal strength that base station receives, the impact of base station type, the dense degree of LNB in UDN, the load condition situation of each base station in UDN, the required type of service of each terminal, the mobility factor of terminal, the impact that community sub-clustering is selected Terminal Service community, community only allows particular terminal to enter the impact selected Terminal Service community, other factors.
Loading condition based on base station in UDN is considered, the solution of homogeneous network in correlation technique, and is not suitable for heterogeneous network, because when load of base station is overweight slightly for certain time, then to reduce natively very little LNB transmitting power be inappropriate.In prior art, be only the switching frequency having added up terminal, carry out community selection according to switching frequency, switching frequency is not adjusted, therefore the stability of terminal access community in prior art, can not be ensured.
For not ensureing in correlation technique that terminal accesses the problem of the stability of community, at present effective solution is not yet proposed.
Summary of the invention
For in correlation technique for the problem of stability that can not ensure terminal access community in correlation technique, the invention provides select a kind of community method, device, base station and terminal, at least to solve the problem.
According to an aspect of the present invention, provide a kind of method that community is selected, comprising: obtain the switching type of terminal and the switching frequency of described terminal; Judge whether to adjust the cell reselection parameters for reducing described switching frequency according to described switching type and described switching frequency; When judged result is for being, adjust described cell reselection parameters; The serving BS described cell reselection parameters after adjustment being handed down to described terminal carries out community selection for described serving BS.
Preferably, adjust described cell reselection parameters to comprise: be low power base station LNB-macro base station MNB-LNB at described switching type, and when described switching frequency is greater than the first preset value, adjust the cell reselection offset amount Q of the cell reselection parameters of LNB in described terminal region
offsetvalue; Be LNB-LNB at described switching type, and described switching frequency is greater than the second preset value when being less than the 3rd preset value, adjusts the cell reselection lag parameter Q of the cell reselection parameters of LNB in described terminal region
hystvalue and cell reselection timer T
reselectionvalue.
According to a further aspect in the invention, additionally provide a kind of method that community is selected, comprising: to the switching type of base station transmitting terminal and the switching frequency of described terminal; In described base station by the mode adjusted cell reselection parameters according to described switching type and described switching frequency, after reducing switching frequency, carry out community access and measure; According to measurement result access community.
Preferably, comprise according to measurement result access community: be low power base station LNB-macro base station MNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the first preset value, the LNB in access region; Be LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the second preset value, the LNB in access region.
Preferably, comprise according to measurement result access community: be LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is greater than the 3rd preset value, the MNB in access region.
According to a further aspect in the invention, additionally provide the device that a kind of community is selected, comprising: acquisition module, for the switching frequency of the switching type and described terminal that obtain terminal; Judge module, for judging whether to adjust the cell reselection parameters for reducing described switching frequency according to described switching type and described switching frequency; Adjusting module, for when judged result is for being, adjusts described cell reselection parameters; Issue module, carry out community selection for the serving BS described cell reselection parameters after adjustment being handed down to described terminal for described serving BS.
Preferably, described adjusting module comprises: the first adjustment unit, for being low power base station LNB-macro base station MNB-LNB at described switching type, and when described switching frequency is greater than the first preset value, adjust the cell reselection offset amount Q of the cell reselection parameters of LNB in described terminal region
offsetvalue; Second adjustment unit, for being LNB-LNB at described switching type, and described switching frequency is greater than the second preset value when being less than the 3rd preset value, adjusts the cell reselection lag parameter Q of the cell reselection parameters of LNB in described terminal region
hystvalue and cell reselection timer T
reselectionvalue.
Present invention also offers a kind of base station, at least comprise said apparatus.
According to a further aspect in the invention, additionally provide the device that a kind of community is selected, comprising: sending module, to the switching type of base station transmitting terminal and the switching frequency of described terminal; Measurement module, for passing through the mode adjusted cell reselection parameters according to described switching type and described switching frequency in described base station, after reducing switching frequency, carries out community access and measures; Access module, for accessing community according to measurement result
Preferably, described access module comprises: the first access unit, for being low power base station LNB-macro base station MNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the first preset value, the LNB in access region; Second access unit, for being LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the second preset value, the LNB in access region.
Preferably, described access module comprises: the 3rd access unit, for being LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is greater than the 3rd preset value, and the MNB in access region.
Present invention also offers a kind of terminal, at least comprise said apparatus.
By the present invention, adopt and obtain the switching type of terminal and the switching frequency of described terminal; Judge whether to adjust the cell reselection parameters for reducing described switching frequency according to described switching type and described switching frequency; When judged result is for being, adjust described cell reselection parameters; The serving BS described cell reselection parameters after adjustment being handed down to described terminal carries out community selection for described serving BS, solve in correlation technique the problem of the stability that can not ensure terminal access community, by adjustment cell reselection parameters, make terminal that more excellent community can be selected to access, thus reduce the switching frequency of terminal, ensure that the stability of terminal access community.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that in correlation technique, UDN disposes;
Fig. 2 is the schematic diagram of 3dBCIO in heterogeneous network system in correlation technique;
Fig. 3 is the schematic diagram of the micro-base station extruding occurred in UDN in correlation technique;
Fig. 4 is the flow chart one according to the cell selecting method of the embodiment of the present invention;
Fig. 5 is the unbalanced schematic diagram of up-downgoing in heterogeneous network system in correlation technique;
Fig. 6 is the flowchart 2 of the cell selecting method according to the embodiment of the present invention;
Fig. 7 is the block diagram one according to the cell selecting apparatus of the embodiment of the present invention;
Fig. 8 is the block diagram one of cell selecting apparatus according to the preferred embodiment of the invention;
Fig. 9 is the block diagram two according to the cell selecting apparatus of the embodiment of the present invention;
Figure 10 is the flow chart of terminal mobility process in the UDN according to the embodiment of the present invention;
Figure 11 be in the UDN according to the embodiment of the present invention terminal by the schematic diagram of the track of each community;
Figure 12 is cell selecting method flow chart according to the preferred embodiment of the invention;
Figure 13 is the block diagram of community selection according to the preferred embodiment of the invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Cell selecting method in the embodiment of the present invention, Fig. 4 is the flow chart one according to the cell selecting method of the embodiment of the present invention, and as shown in Figure 4, the method comprises the following steps:
Step S402, obtains the switching type of terminal and the switching frequency of this terminal;
Step S404, judges whether to adjust the cell reselection parameters for reducing described switching frequency according to this switching type and this switching frequency;
Step S406, when judged result is for being, adjusts this cell reselection parameters;
Step S408, the serving BS this cell reselection parameters after adjustment being handed down to this terminal carries out community selection for this serving BS.
Pass through above-mentioned steps, macro base station judges whether to need to adjust this switching frequency according to the switching type of terminal and the switching frequency of this terminal, when needs adjust this switching frequency, this switching frequency is adjusted by adjustment cell reselection parameters, and the serving BS cell reselection parameters after adjustment being handed down to this terminal carries out community selection for this serving BS, select relative to the community in correlation technique, adopt selecting according to the cell reselection parameters Lai Dui community after adjustment of this programme, efficiently solve in correlation technique the problem of the stability that can not ensure terminal access community, by adjustment cell reselection parameters, make terminal that more excellent community can be selected to access, thus reduce the switching frequency of terminal, ensure that the stability of terminal access community.
In LTE/LTE-AHetNet and HSPAHetNet, the unbalanced attenuation method of the up-downgoing the most often used is the biased (CellIndividualOffset of cell individual, referred to as CIO), Fig. 5 is the unbalanced schematic diagram of up-downgoing in heterogeneous network system in correlation technique, as shown in Figure 5.Heterogeneous system is lower due to the transmitting power of the LNB introduced, and differs comparatively large with the transmitting power of MNB, and therefore compared with MNB, the coverage of LNB is obviously less, causes the descending covering separation between MNB and LNB obviously to offset to LNB side.But from up angle, terminal is identical to the ascending power that MNB and LNB launches, the up covering separation therefore between MNB and LPN still remains near the mid point of the two line.Like this, up-downgoing covers between separation and just there will be one piece of unbalanced region.CIO refers to that terminal is when carrying out community selection, compares after the pilot signal strength receiving LNB is added certain biased (bias) with the pilot signal strength receiving macro base station again.The scope of LNB can be expanded like this, some MNB terminals are unloaded on LNB, and the distance of MNB edge termination to serving BS can be reduced, the up link of MNB edge termination is strengthened.The more important thing is, generally, the duty ratio MNB of LNB is gently a lot, unloads a part of MNB terminal on LNB, load balance between the base station being conducive to very much system.
The embodiment of the present invention is applicable to the selection of Serving cell in UDN, introduces terminal mobility, loading condition between base station, terminal traffic type, and some other impact selected Terminal Service community.
In UDN, base station needs to broadcast its kind, so that terminal makes corresponding setting.
Downstream signal intensity is the Consideration that Serving cell is selected always, relevant with the path gain of base station transmitting power and channel.Uplink signal strength, the factor need not considered in homogeneous network in the past, must include Consideration in heterogeneous network.Relevant with terminal transmit power and channel path gain.And in a tdd system, the path gain of up-downgoing can regard identical as, so the factor of uplink signal strength can give downstream signal intensity and base station transmitting power is considered.In the present embodiment, the base station signal descending pilot frequency intensity received by terminal and the type of base station are realized.
In HSPAHetNet and LTEHetNet, normally simple gives LNB mono-biased (bias), adopts the mode adding CIO to expand the service range of LNB, terminal is more partial to and is served by LNB.But we notice, in UDN, the difference of LNB and MNB has been not only transmitting power.On carrier frequency, LNB (Micro2.6GHz and Pico3.5GHz) is higher than MNB (800MHz), and in bandwidth, LNB (80MHz) is wider than MNB (20MHz).Based on these two factors, in UDN, the resource of LNB is more than MNB a lot, but the path loss of the signal of LNB transmitting is more much bigger than MNB, and the difference in these two configurations are all unfavorable for the load of MNB to be discharged on LNB.So in UDN, need by distinguishing base station type, the load between base station to be balanced more.
LNB dense degree in UDN is also the distinctive factor that must consider in UDN.As mentioned above, UDN heterogeneous network in the past, in each MNB community, the number of LNB is no more than tens, substantially between micro-base station relatively far apart, in macro base station, enter the situation of the micro-base station of another one after terminal has seldom gone out to reveal micro-base station after short stay, i.e. LNB-MNB-LNB switches.And in UDN, time LNB number reaches tens in each MNB community, just there is above-described scene, will easily cause signaling storm.
Carry out the selection of terminal subsequent time Serving cell at network side before, this terminal first carries out ambulant judgement.Terminal, according to the switching frequency of oneself, judges it self is high-speed mobile or low speed moves, and measurement result is reported base station, place.
Terminal is by identifying its serving BS type, if terminal counts on the switching of a large amount of LNB-MNB-LNB, statistics is reported base station, place by terminal, and reports place MNB by base station, place by back haul link (backhaul).MNB adjusts the Q in the cell reselection R criterion of the LNB of all terminals in its region by backhaul
offsetvalue, thus the CIO value expanding LNB, until the number of terminal LNB-MNB-LNB is enough low.
The quantity switched at LNB-MNB-LNB reach abundant after, by adjusting the parameter of the selection of Terminal Service community, allow seamless between micro-base station service areas being connected, terminal does not need again through being switched to this step of macro base station.In heterogeneous network, consider it is more the load balancing between LNB, by base station is divided into free time, normal, busy, congested four kinds of states by subframe usage ratio, then terminal is told in broadcast, to change the parameter of terminal when using S criterion to carry out community selection.
The required business model of terminal, by the demand of business to resource, the mainly demand of time delay and throughput, carries out grade classification business.R criteria parameter when being selected by adjustment terminal housing estate, is made to take the many terminals of resource as far as possible and is served by LNB.
Fast mobile terminal sexual factor, HetNet before also has impact mobility is discussed and selected Serving cell.Method is at that time that the switching times considered by the terminal unit time divides, and is divided into the ambulant terminal of high, medium and low speed 3 class.In UDN, continue to use this division methods.Wherein, the terminal of low-speed motion is by access way access network before, and the terminal of high-speed mobile does not access LNB, only accesses MNB, and the terminal of middling speed motion, then according to speed, changes the parameter in R criterion, optionally accesses a part of LNB.We both can utilize the resource of LNB base station in UDN as best one can like this, avoided the signaling storm too frequently switching and bring.
As the preferred mode of one, be low power base station LNB-macro base station MNB-LNB at switching type, and when switching frequency is greater than the first preset value, wherein, first preset value can be arranged according to the relevant parameter of base station, the Q of the cell reselection parameters of LNB in adjustment terminal region
offsetvalue, expands the CIO value of LNB, LNB coverage is increased, until the number of terminal LNB-MNB-LNB is enough low, reduces the switching frequency of terminal, thus it is more stable that terminal is accessed.
As the preferred mode of one, be LNB-LNB at switching type, and switching frequency is greater than the second preset value when being less than the 3rd preset value, the Q of the cell reselection parameters of LNB in adjustment terminal region
hystvalue and T
reselectionvalue, reduces the switching frequency of terminal.If it is too much that the LNB-LNB of terminal switches number, illustrate that this terminal is middling speed or high-speed terminal.If this terminal is high speed mobile terminal, forbid this terminal access LNB, to avoid switching too frequently; Move if this terminal is middling speed, terminal, then adjust the R criteria parameter Q that its community is selected
hystand T
reselection, reduce the switching frequency of this terminal.Namely MNB adjusts the Q of the cell reselection R criteria parameter increasing current service cell of LNB in its region by backhaul
hystand T
reselectionvalue, makes high speed mobile terminal not access LNB, and reduces the quantity of middling speed terminal access LNB.
Preferably, for the medium/low fast terminal that can access LNB, each community is divided into free time, normal, busy, congested four classes according to triplet frame utilance in upper a period of time, informs terminal, and adjust the Q of this community in end by broadcast channel
offsetvalue, makes terminal tend to select idle community to serve.In order to the four class state boundaries of LNB and MNB can be different, to Q
offsetadjusting range also can be different.Thus under making equal loading condition, terminal is tended to select LNB to serve.
Preferably, serving BS can business service type needed for terminal, and according to the type of base station, adjusts the Q of each base station in this end
offsetvalue, makes to tend to be served by LNB to the terminal of the large business of resource requirement.In addition, other is taken into account the factor that best server cell affects, by changing the parameter in S criterion and R criterion, affecting the selection of terminal to Serving cell, thus reaching the selection of best server cell.Considering the resource of community, need bunch in the resource of other community also take into account.When community only allows particular terminal to enter, terminal does not enter conditional community.
The method that another kind of community in the embodiment of the present invention is selected, Fig. 6 is the flowchart 2 of the cell selecting method according to the embodiment of the present invention, and as shown in Figure 6, the method comprises the following steps:
Step S602, to the switching type of base station transmitting terminal and the switching frequency of this terminal;
Step S604, in this base station by the mode adjusted cell reselection parameters according to this switching type and this switching frequency, after reducing switching frequency, carries out community access and measures;
Step S606, according to measurement result access community.
As the preferred mode of one, be low power base station LNB-macro base station MNB-LNB at switching type, and adjust the switching frequency after cell reselection parameters when being less than the first preset value, moving velocity of terminal is less, directly can access the LNB in region, frequent switching can not be there is, therefore terminal access community can be made to be in more stable.
As the preferred mode of another kind, be LNB-LNB at switching type, and adjust the switching frequency after cell reselection parameters when being less than the second preset value, moving velocity of terminal is less, LNB in access region, frequent switching can not be there is, therefore terminal access community can be made to be in more stable.
As the preferred mode of another kind, be LNB-LNB at switching type, and adjust the switching frequency after cell reselection parameters when being greater than the 3rd preset value, terminal is in high-speed mobile, MNB in direct access region, makes switching frequency less, thus reaches stable effect.
The embodiment of the present invention is in UDN, the problem that terminal best server cell is selected.Terminal not only will select Serving cell based on descending pilot frequency intensity, also to consider uplink quality simultaneously, the loading condition of Macro base station, Micro base station and Smallcell base station, terminal traffic type, and Terminal Service community is selected in the aspect such as terminal mobility consideration.Based on this method, intrasystem terminal can obtain the service of optimal service base station.
The present embodiment additionally provides a kind of terminal, at least comprises said apparatus.
The device of a kind of community selection of the embodiment of the present invention, Fig. 7 is the block diagram one according to the cell selecting apparatus of the embodiment of the present invention, as shown in Figure 7, this device comprises: acquisition module 72, judge module 74, adjusting module 76, issue module 78, is described below to above-mentioned module:
Acquisition module 72, for the switching frequency of the switching type He this terminal that obtain terminal;
Judge module 74, for judging whether to adjust this switching frequency according to this switching type and this switching frequency;
Adjusting module 76, for when judged result is for being, adjusts the cell reselection parameters for reducing switching frequency;
Issue module 78, carry out community selection for the serving BS cell reselection parameters after adjustment being handed down to terminal for this serving BS.
As one preferred embodiment, Fig. 8 is the block diagram one of cell selecting apparatus according to the preferred embodiment of the invention, and as shown in Figure 8, adjusting module 76 comprises:
First adjustment unit 82, for being low power base station LNB-macro base station MNB-LNB at switching type, and when switching frequency is greater than the first preset value, the Q of the cell reselection parameters of LNB in adjustment terminal region
offsetvalue;
Second adjustment unit 84, for being LNB-LNB at switching type, and switching frequency is greater than the second preset value when being less than the 3rd preset value, the Q of the cell reselection parameters of LNB in adjustment terminal region
hystvalue and T
reselectionvalue.
According to a further aspect in the invention, additionally provide the device that a kind of community is selected, Fig. 9 is the block diagram two according to the cell selecting apparatus of the embodiment of the present invention, as shown in Figure 9, this device comprises: sending module 92, receiver module 94, selection module 96, be described above-mentioned module below:
Sending module 92, to the switching type of base station transmitting terminal and the switching frequency of this terminal;
Measurement module 94, for passing through the mode adjusted cell reselection parameters according to this switching type and this switching frequency in this base station, after reducing switching frequency, carries out community access and measures;
Access module 96, for accessing community according to measurement result.
As one preferred embodiment, access module 96 comprises: the first access unit, for being low power base station LNB-macro base station MNB-LNB at this switching type, and adjust the switching frequency after cell reselection parameters when being less than the first preset value, the LNB in access region; Second access unit, for being LNB-LNB at switching type, and adjusts the switching frequency after cell reselection parameters when being less than the second preset value, the LNB in access region.
As a kind of more excellent execution mode, access module 96 also comprises: the 3rd access unit, for being LNB-LNB at switching type, and adjusts the switching frequency after cell reselection parameters when being greater than the 3rd preset value, the MNB in access region.
The present embodiment additionally provides a kind of base station, at least comprises said apparatus.
Be described below in conjunction with preferred embodiment, following preferred embodiment combines above-described embodiment and preferred implementation thereof.
Figure 10 is the flow chart of terminal mobility process in the UDN according to the embodiment of the present invention, as shown in Figure 10, carries out community select to comprise the following steps according to the mobility of terminal:
Step S1002: in terminal statistics certain hour, whether the number of times that Serving cell switches is more than N
cR_M.If do not exceeded, jump to S1004, if exceeded, jump to S1008.
Step S1004: terminal is in static or low-speed motion state, jumps to S1006.
Step S1006: by mobility treating method process in LTE heterogeneous network before.
Step S1008: terminal may be in medium/high fast motion state, or is in pingpang handoff state, the kind that we can switch according to these judges.In terminal judges measurement period, whether the number that LNB-MNB-LNB switches is more than N
cR_M_LML, if so, jump to S1010, otherwise, jump to S1012.
Step S1010: the switching having a large amount of ping-pongs in the switching of terminal.This phenomenon is reported serving BS by terminal, and serving BS allows all LNB in its place macro base station tune up CIO by backhaul and arranges, expand the coverage of LNB, reduces and even eliminates ping-pong.And return S1002 in the redirect of next one switching number measurement period.
Whether the ratio that step S1012: terminal judges in the cell merge of terminal under being in medium/high fast motion state, MNB-MNB switch is more than PMM.If exceeded, jump to S1014, otherwise jump to S1016.
Step S1014: terminal is in medium/high fast motion state, and switching is the switching of MNB-MNB substantially.Network then now residing for terminal does not dispose too many LNB, then now S1006 is returned in redirect, processes according to common LTE heterogeneous network mobility treating method.
Step S1016: terminal is in medium/high fast motion state, and switching is the switching of LNB-LNB substantially.Namely terminal is now in UDN, and with in medium/high speed motion.
Step S1018: judge whether the switching number of terminal exceedes the critical number N of high-speed motion switching
cR_H.If exceeded and jumped to S1020, otherwise, jump to S1022.
Step S1020: terminal, in the motion of UND high speed, does not access any LNB, only accesses MNB.And during mobility process between MNB, S1006 is returned in redirect, processes according to common LTE heterogeneous network mobility treating method.
Step S1022:N
cR_Mthe switching number <N of < terminal
cR_H, terminal is in middling speed motion state, then serving BS is to the R criteria parameter Q of this terminal
hystand T
reselectionmodify.Q
hystthe added value of Serving cell when comparing with other community, T
reselectionthat terminal is by the shortest time of a cell serves.Tune up Q
hystsome terminals can be reduced only through the community at edge, and tune up T
reselectionthe switching times being switched to the very little LNB of service area can be reduced.As shown in figure 11.
Figure 11 is that in the UDN according to the embodiment of the present invention, terminal is by the schematic diagram of the track of each community, and as shown in figure 11, have ABCD tetra-micro-base stations in macro base station, line is the movement locus of terminal.If simple according to the intensity receiving pilot tone, terminal will be served by MNB-A-MNB-B-MNB-C-MNB-D-MNB successively, but as shown in FIG., the coverage of C is too little, and the time that the terminal in motion is served by C is very short.Although and the coverage of D is comparatively large, and terminal is just nuzzled up at its edge, the gain of being carried out serving acquisition by it is limited.So increase T
reselection, the frequency that mobile terminal is served by this LNB among a small circle of C can be reduced.And increase Q
hyst, terminal switch can be reduced to the switching frequency just to cell edge.Can when less affecting Terminal Service quality by these two kinds of methods, greatly reduce the frequency that terminal under motion state switches in UDN.
Figure 12 is cell selecting method flow chart according to the preferred embodiment of the invention, as shown in figure 12, the judgement of state is carried out by the utilization rate of triplet frame in upper a period of time in each community, available free (20%), normal (50%), busy (75%), congested (95%) four kind of state.Then community is according to the loading condition of oneself, arranges corresponding Q
offsetvalue, the wherein Q of congestion state community
offsetarrange very high, namely represent and do not wish new terminal access, and the Q of idle condition community
offsetarrange very low, wish that terminal accesses.The interval of these states can adjust according to real network situation, and the Q of the boundary of (LNB and MNB) four kinds of states and the setting of often kind of state between variety classes base station
offsetcan change with base station kind, make terminal tend to select LNB under the loading condition of same degree.Specifically comprise the following steps:
Step S1202, judges the translational speed of terminal in UDN according to switching frequency, when judged result is high speed, perform step S1204, when judged result is medium/low speed, performs step S1206;
Step S1204, the MNB in terminal access region;
Step S1206, LNB or MNB in terminal access region;
Step S1208, according to the situation of load, the Q in adjustment cell reselection parameters
offset, and pass to terminal by system broadcasts;
Step S1210, the pilot signal SINR received is reported serving BS by terminal, and serving BS is in conjunction with the Q of reported result and each community
offsetcarry out the selection of Serving cell.
Figure 13 is the block diagram selected of community according to the preferred embodiment of the invention, as shown in figure 13, except the loading condition of terminal mobility and each community, comprising service impact factor, base station bunch influencing factor, restricted terminal influencing factor and other factors.Similar, similar means also can be used when carrying out the consideration of other factors to obtain, judging, adjust, issue this whole process and adjust, to ensure that system improves the gain of system to the continuity that UE serves simultaneously.Consider that service impact, base station bunch impact etc. are all similar to the situation considering load of base station impact, so repeat no more concrete method step.
Service impact factor refers in terminal, terminal is the uninterrupted according to miscellaneous service, requirement of real-time and service quality (Qualityofservice, referred to as QoS) feature such as requirement, set up the model of several business, then according to the requirement of miscellaneous service, the Qoffset value of all kinds of base station is adjusted in this end, such as, for the business of this large discharge of video class, turn down the Q of LNB classification
offsetvalue, makes this business be served by LNB as far as possible.
The influencing factor of base station bunch, mainly refer to for sub-clustering community, we will discuss in conjunction with the result of sub-clustering.Such as inter-cell frequency multiplexing scheme, then need to select best server cell in conjunction with LTE Reference Signal Received Quality (ReferenceSignalReceivingQuality, referred to as RSRQ) and frequency reuse plan.And be not only by method S criterion before.Restricted terminal, restricted cell, namely some terminal can not access certain community, or certain terminal can not access some community.Also comprise the factor that other influences community is selected.
Best server cell is selected to comprise following content: for service impact factor, classify according to business characteristic, as far as possible terminal distribution high for resource requirement to the many base station of idling-resource; For base station bunch factor, need the idling-resource of other base station in considering bunch; Limited resource is namely for reservation community, or restricted terminal, and terminal does not access as far as possible; Other factors.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a method for community selection, is characterized in that, comprising:
Obtain the switching type of terminal and the switching frequency of described terminal;
Judge whether to adjust the cell reselection parameters for reducing described switching frequency according to described switching type and described switching frequency;
When judged result is for being, adjust described cell reselection parameters;
The serving BS described cell reselection parameters after adjustment being handed down to described terminal carries out community selection for described serving BS.
2. method according to claim 1, is characterized in that, adjusts described cell reselection parameters and comprises:
Be low power base station LNB-macro base station MNB-LNB at described switching type, and when described switching frequency is greater than the first preset value, adjust the cell reselection offset amount Q of the cell reselection parameters of LNB in described terminal region
offsetvalue;
Be LNB-LNB at described switching type, and described switching frequency is greater than the second preset value when being less than the 3rd preset value, adjusts the cell reselection lag parameter Q of the cell reselection parameters of LNB in described terminal region
hystvalue and cell reselection timer T
reselectionvalue.
3. a method for community selection, is characterized in that, comprising:
To the switching type of base station transmitting terminal and the switching frequency of described terminal;
In described base station by the mode adjusted cell reselection parameters according to described switching type and described switching frequency, after reducing switching frequency, carry out community access and measure;
According to measurement result access community.
4. method according to claim 3, is characterized in that, comprises according to measurement result access community:
Be low power base station LNB-macro base station MNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the first preset value, the LNB in access region;
Be LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the second preset value, the LNB in access region.
5. method according to claim 3, is characterized in that, comprises according to measurement result access community:
Be LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is greater than the 3rd preset value, the MNB in access region.
6. a device for community selection, is characterized in that, comprising:
Acquisition module, for the switching frequency of the switching type and described terminal that obtain terminal;
Judge module, for judging whether to adjust the cell reselection parameters for reducing described switching frequency according to described switching type and described switching frequency;
Adjusting module, for when judged result is for being, adjusts described cell reselection parameters;
Issue module, carry out community selection for the serving BS described cell reselection parameters after adjustment being handed down to described terminal for described serving BS.
7. device according to claim 6, is characterized in that, described adjusting module comprises:
First adjustment unit, for being low power base station LNB-macro base station MNB-LNB at described switching type, and when described switching frequency is greater than the first preset value, adjusts the cell reselection offset amount Q of the cell reselection parameters of LNB in described terminal region
offsetvalue;
Second adjustment unit, for being LNB-LNB at described switching type, and described switching frequency is greater than the second preset value when being less than the 3rd preset value, adjusts the cell reselection lag parameter Q of the cell reselection parameters of LNB in described terminal region
hystvalue and cell reselection timer T
reselectionvalue.
8. a base station, is characterized in that, comprises the device according to any one of claim 6 to 7.
9. a device for community selection, is characterized in that, comprising:
Sending module, to the switching type of base station transmitting terminal and the switching frequency of described terminal;
Measurement module, for passing through the mode adjusted cell reselection parameters according to described switching type and described switching frequency in described base station, after reducing switching frequency, carries out community access and measures;
Access module, for accessing community according to measurement result.
10. device according to claim 9, is characterized in that, described access module comprises:
First access unit, for being low power base station LNB-macro base station MNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the first preset value, the LNB in access region;
Second access unit, for being LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is less than the second preset value, the LNB in access region.
11. devices according to claim 9, is characterized in that, described access module comprises:
3rd access unit, for being LNB-LNB at described switching type, and when the switching frequency adjusted after described cell reselection parameters is greater than the 3rd preset value, the MNB in access region.
12. 1 kinds of terminals, is characterized in that, comprise the device according to any one of claim 9 to 11.
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