CN104469817B - The method for controlling small base station dormancy based on load and interference level - Google Patents
The method for controlling small base station dormancy based on load and interference level Download PDFInfo
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- CN104469817B CN104469817B CN201310430067.4A CN201310430067A CN104469817B CN 104469817 B CN104469817 B CN 104469817B CN 201310430067 A CN201310430067 A CN 201310430067A CN 104469817 B CN104469817 B CN 104469817B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- 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 kind of method controlling small base station dormancy based on load and interference level, wherein first determine whether the load capacity of this cell, when load capacity reaches certain level, and small base station user is when being located at cell edge, starts and adjudicates the presence of small base station and whether bring the process of a degree of downlink interference to periphery adjacent cell；If it is determined that small base station brings a degree of interference to periphery adjacent cell, then small base station enters dormant state, and switches its home subscriber to suitable base station.The method for controlling small base station dormancy based on load and interference level of the present invention passes through the judgement of business load and generated interference level to this cell, come small base station under control hierarchy networking scene and enters dormant state, to effectively reduce the interference in layering networking scene, the downlink interference brought with particular reference to signal etc., improve throughput of system, it ensure that effective operation of system, and save energy consumption, realize green communications.
Description
Technical field
The invention belongs to the technical fields of forth generation mobile communications network, particularly, are related to a kind of based on load and interference
The method that level controls small base station dormancy.
Background technology
3GPP R12 are carrying out " Small Cell Enhancements (SCE) for E-UTRA and E- at present
UTRAN–Physical-layer Aspects”（Small cell physical layer enhancing in E-UTRA networks）Research.Wherein, for small
Effective operation of base station proposes that being directed to changeable business within the physical layer proposes effective interference coordination mechanism, and the small base of concern
It stands dynamic suspend mode and activation.Wherein, dormant state refers to the down channel transmitting for closing base station, is not retransmited any with reference to letter
Number（Reference Signal, RS）.
In R12 in order to improve throughput of system will in the macro base station coverage area of high flow capacity the small base station of dense deployment,
With the load of this balanced macro base station.However, the small base station of dense deployment will bring more interference, keep interference environment more complicated,
Dominant interferer will be not only one, but multiple, and also not only macro base station can bring downlink to interfere, and also can between small base station
Generate strong downlink interference.Therefore, in order to reduce or eliminate interference, it can close, make it into when small base station does not have user
Dormant state；And when user enters small base station range, then small base station is activated, covering loophole is avoided.It can reduce in this way
Interference can also save energy consumption, realize green communications.
It is mainly adjusted at present into Mobile state according to business model or service traffics for the suspend mode of the small base station of layering networking.Example
Such as, daytime, service traffics were big, and base station is switched on, and when evening service traffics reduce, then close portion of base stations.In 3GPP standards
Change in meeting, for the small base station of dense deployment layering networking propose that small base station can be closed when portfolio reduces it is dry to reduce
It disturbs, network is made effectively to run.However, concrete scheme does not further discuss.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide one kind based on load and interference level
The method for controlling small base station dormancy is directed to the Hierarchical Network scene of the small base station of dense deployment, from cell load amount and interference level
Two dimensions consider, when small base station home subscriber is less, and it exists and causes various interference, the downlink of especially small base station
When the interference that reference signal is brought, small base station is made to enter dormant state, reduces interference to reach, saves energy consumption and improve network
The purpose of operational efficiency.
In order to achieve the above objects and other related objects, the present invention provides one kind and controlling small base based on load and interference level
It stands the method for suspend mode, at least includes the following steps：
Step S1：Interaction cell load class information between small base station, this cell load is persistently detected in small base station；
Step S2：When small base station detects that the grade of load of this cell is intermediate part load and full load, small base station continues
Detect this cell load；When small base station detects that this cell load grade is extra-light loading, determine that small base station enters suspend mode shape
State is transferred to step S8；When small base station detects that this cell load grade is light load, S3 is entered step；
Step S3：Judge whether there is user to be located at cell edge position in the home subscriber of small base station；If without user
Positioned at cell edge, small base station ingoing power adjusts process, is transferred to step S4；If there is user is located at cell edge, small base station
Start sleeping process, is transferred to step S5；
Step S4：Small base station transmitting power is reduced, and continues to monitor the cell load of small base station, when detecting new user
Into and the grade of load it is constant when, judge whether the user whether be located at cell edge, if the user is located at cell edge,
Increase base station transmitting power, and be transferred to step S5, if the user is located at center of housing estate, small base station is remained stationary；Work as detection
To new user enter and the grade of load change when, enter step S7；
Step S5：Whether " inter-cell interference instruction " information that small base station is sent according to adjacent cell judges this cell to adjacent small
The height for the interference level that zone is come；If it is low interference level, sleeping process is exited, enters step S6；If it is high level cadre
Disturb level, it is determined that small base station enters dormant state, is transferred to step S8；
Step S6：Cell load is persistently detected in small base station, if detecting that new user accesses and the grade of load is caused to be sent out
Changing is transferred to step S7；If the grade of load is continuously light load, " inter-cell interference instruction " letter received is updated
Breath, judges the height for the interference level that this cell brings adjacent cell；
Step S7：If small base station detects that the grade of load is intermediate part load or full load, this is persistently detected in small base station
Cell load；
Step S8：Small base station home subscriber is switched to neighbouring small base station or macro base station, after completing user's switching, small base
It stands and enters dormant state.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：The cell of small base station is negative
It includes that the grade of load information of adjacent cell is recorded in by extra-light loading, light load, intermediate part load and full load, small base station to carry grade
In the Automatic Neighboring Relation of small base station.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：In step S3, under
It states two methods and judges whether there is user and be located at cell edge position：
A, compare user report this cell RSRP information and adjacent cell RSRP information, by the difference of the two information come
Judge whether the user is located at cell edge；
B, judge whether user is located at cell edge by user coordinates location information.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：In step S5, small base station
According to adjacent cell send " inter-cell interference instruction " information judge this cell whether the height for the interference level that adjacent cell is brought
Low method is as follows：
Adjacent cell sets an interference threshold threshold value, and adjacent cell home subscriber reports the RSRP of the small base station detected, such as
The RSRP of the small base station of fruit is more than interference threshold threshold value, when adjacent cell sends " inter-cell interference instruction " information, is provided in corresponding PRB
It is identified on source, after small base station receives " inter-cell interference instruction " information, PRB number of the statistics more than interference threshold threshold value
Mesh；When the PRB numbers more than interference threshold threshold value are more than certain proportion, then it is assumed that be high interference levels, otherwise it is assumed that being low dry
Disturb level.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：In step S5, small base station
According to adjacent cell send " inter-cell interference instruction " information judge this cell whether the height for the interference level that adjacent cell is brought
Low method is as follows：
Adjacent cell compares the interference threshold threshold value of the RSRP and setting for the small base station measured that its home subscriber reports, and unites
PRB number of the meter more than interference threshold threshold value；If it exceeds the PRB numbers of interference threshold threshold value are more than certain proportion, it is determined that
For high interference levels, otherwise it is determined as low interference level, and interference level is identified in " inter-cell interference instruction " information
Just.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：Only when adjacent cell
When " inter-cell interference instruction " information changes, updated " inter-cell interference instruction " information can just be resend to small
Base station.
According to the above-mentioned method for controlling small base station dormancy based on load and interference level, wherein：In step S8, for ownership
User select switching base station principle for：The small base station of preferential selection intermediate part load, if without satisfactory small base station,
It is switched to macro base station.
As described above, the method for controlling small base station dormancy based on load and interference level of the present invention, has beneficial below
Effect：
（1）The present invention carrys out control hierarchy group by the judgement of business load and generated interference level to this cell
Whether small base station enters dormant state under net scene, to effectively reduce the interference in layering networking scene, with particular reference to letter
Number etc. the downlink interference that brings, improve throughput of system, ensure that effective operation of system, and save energy consumption, realize green
Communication；
（2）The present invention is suitable for LTE-A network system, can be applied in the network of different capacity base station composition, also fits
In the hybrid network covered by different capacity base station for other systems.
Description of the drawings
Fig. 1 is shown as towards dense deployment is small in the macro base station coverage area of high flow capacity in forth generation mobile communication system
The structural schematic diagram of the layering networking of base station.
Fig. 2 is shown as towards dense deployment is small in the macro base station coverage area of high flow capacity in forth generation mobile communication system
Structural schematic diagram in the layering networking of base station after a certain small base station dormancy；
Fig. 3 is shown as the flow chart of the method that small base station dormancy is controlled based on load and interference level of the present invention.
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then component count, shape and size when only display is with related component in the present invention rather than according to actual implementation in schema are painted
System, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel also may be used
It can be increasingly complex.
Under the layering networking scene of the small base station of present invention dense deployment in macro base station coverage area, based on load, user
Position and interference level control the suspend mode of small base station.Small base station first determines whether the load capacity of this cell, when load capacity reaches
Whether certain level, and when small base station user is located at cell edge starts and adjudicates the presence of small base station and brought to periphery adjacent cell
The process of a degree of downlink interference；If it is determined that small base station brings a degree of interference to periphery adjacent cell, then it is small
Base station enters dormant state, and switches its home subscriber to suitable base station.
Wherein, the load capacity of small base station is set as following 4 grades：Extra-light loading, light load, intermediate part load and full load.
Grade of load information is interacted by X2 interface between small base station, while the grade of load information that interaction comes is recorded in small base station
In Automatic Neighboring Relation.When the grade of load of small base station adjacent cell changes, in the Automatic Neighboring Relation for updating small base station
Grade of load information.If small base station is extra-light loading, it is determined that it enters dormant state；If it is light load, judge
Whether there is user to be located at cell edge in small base station.If there is user is located at cell edge, starts and differentiate small base station whether to neighbour
Cell brings the process that downlink is interfered；If small base station no user is located at cell edge, small base station is adjusted to suitable transmitting
Power.
If it is determined that small base station enters dormant state, home subscriber preferentially selects the small base station of the neighbours of intermediate part load to cut
It changes, if without satisfactory small base station, is switched to macro base station, after the completion of user switches, small base station enters suspend mode shape
State.
Fig. 1 describe towards in forth generation mobile communication system in the macro base station coverage area of high flow capacity dense deployment
The structural schematic diagram of the layering networking of small base station.Wherein, hierarchical network is on the basis for the macrocellular network being made of macro base station
On, in addition the small base station of multiple low-power（Small cell, sc）Covering, and small base station dense deployment form different capacity base station
The multitiered network of covering.As shown in Fig. 2, after starting based on load and interference level control, small base station sc7 enters due to meeting
The requirement of dormant state, home subscriber is switched to suitable base station under former small base station sc7, and user UE2 switches into neighbouring small base
Stand sc1, and user UE3 switches into neighbouring small base station sc2, and small base station sc7 enters dormant state.
With reference to Fig. 3, the method for the invention for controlling small base station dormancy based on load and interference level specifically includes following
Step：
Step S1：Small base station continues to monitor this cell load, passes through X2 interface interaction cell load grade between small base station
Information and the Automatic Neighboring Relation that the grade of load information of adjacent cell is recorded in small base station（Automatic Neighbor
Relationship, ANR）In, and this information is updated when the adjacent cell grade of load changes.
Step S2：When small base station detects that the grade of load of this cell is intermediate part load and full load, small base station continues
Detect this cell load；When small base station detects that this cell load grade is extra-light loading, determine that small base station enters suspend mode shape
State is transferred to step S8；When small base station detects that this cell load grade is light load, it is transferred to step S3.
Step S3：First determine whether the distribution of the home subscriber of small base station, it is determined whether there is user to be located at cell edge position.
Wherein, it judges whether there is user by following two methods and is located at cell edge position：
（1）This cell RSRP information and adjacent cell RSRP information for comparing user's report, when the difference of the two values is at certain
When a interval range, then judge that user is located at cell edge；
（2）Small base station obtains user coordinates location information, judges whether user is located at cell edge.
If being located at cell edge without user, small base station ingoing power adjusts process, is transferred to step S4；If there is user
Positioned at cell edge, small base station starts sleeping process, is transferred to step S5；
Step S4：Due to there is no user to be located at cell edge in small base station, therefore small base station transmitting power is suitably reduced, reduced
Its coverage area can reduce the downlink interference brought to periphery adjacent cell, can also save energy consumption in this way.Small base station continues to monitor
Cell load judges whether the user when detecting new user's entrance and the constant grade of load by customer position information
Whether it is located at cell edge, if being located at cell edge, increases base station transmitting power, and be transferred to step S5, if positioned at small
District center then continues to original state；When detecting that new user's entrance and the grade of load change, S7 is entered step；
Step S5：If there is user is located at cell edge, then start sleeping process, first determines whether this cell whether to adjacent small
Zone carrys out downlink interference.When adjacent cell detects that this small base station is light load by the record in ANR, " inter-cell interference is sent
Instruction " information is to small base station.Wherein, it only just updates and is sent to small when " inter-cell interference instruction " information changes
Base station.
In the present invention, judge interference level that this cell brings adjacent cell by following two methods：
（1）Adjacent cell sets an interference threshold threshold value, and adjacent cell home subscriber reports the RSRP of the small base station detected,
If the RSRP of small base station is more than interference threshold threshold value, when adjacent cell sends " inter-cell interference instruction " information, in corresponding PRB
It is identified in resource, after small base station receives " inter-cell interference instruction " information, PRB number of the statistics more than interference threshold threshold value
Mesh；When the PRB numbers more than interference threshold threshold value are more than certain proportion, then it is assumed that be high interference levels, otherwise it is assumed that being low dry
Disturb level；
（2）Adjacent cell compares the interference threshold threshold value of the RSRP and setting for the small base station measured that its home subscriber reports,
And statistics is more than the PRB numbers of interference threshold threshold value；If this PRB number be more than some ratio, it is determined that interference rank be
Otherwise height determines that interference rank is low, and identifies interference level in " inter-cell interference instruction " information for being sent to small base station
Height.
After small base station receives " inter-cell interference instruction " information of adjacent cell, determine this cell to adjacent small according to the information
The height for the interference level that zone is come；If it is low interference level, sleeping process is exited, enters step S6；If it is high level cadre
Disturb level, it is determined that small base station enters dormant state, is transferred to step S8；
Step S6：Cell load is persistently detected in small base station, if detecting that new user accesses and the grade of load is caused to be sent out
Changing is transferred to step S7；If the grade of load is continuously light load, " inter-cell interference instruction " letter received is updated
Breath, judges the height for the interference level that this cell brings adjacent cell；
Step S7：Terminate if small base station detects that the grade of load is intermediate part load or full load small base station dormancy into
Journey, meanwhile, this cell load is persistently detected in small base station；
Step S8：Small base station, which determines, enters dormant state, its home subscriber is switched to neighbouring small base station or macro base station, when
After completing user's switching, small base station enters dormant state.Wherein, home subscriber select switching base station principle for：Preferential choosing
The small base station of intermediate part load is selected, if without satisfactory small base station, is switched to macro base station.
In conclusion the method for controlling small base station dormancy based on load and interference level of the present invention passes through to this cell
The judgement of business load and generated interference level comes small base station under control hierarchy networking scene and enters dormant state, to
The interference in layering networking scene is effectively reduced, is interfered with particular reference to the downlink that signal etc. is brought, improves throughput of system,
It ensure that effective operation of system, and save energy consumption, realize green communications.So the present invention effectively overcomes in the prior art
Various shortcoming and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should by the present invention claim be covered.
Claims (7)
1. a kind of method controlling small base station dormancy based on load and interference level, which is characterized in that at least include the following steps：
Step S1：Interaction cell load class information between small base station, this cell load is persistently detected in small base station；
Step S2：When small base station detects that the grade of load of this cell is intermediate part load and full load, small base station is persistently detected
This cell load；It when small base station detects that this cell load grade is extra-light loading, determines that small base station enters dormant state, turns
Enter step S8；When small base station detects that this cell load grade is light load, S3 is entered step；
Step S3：Judge whether there is user to be located at cell edge position in the home subscriber of small base station；If be located at without user
Cell edge, small base station ingoing power adjust process, are transferred to step S4；If there is user is located at cell edge, small base station starts
Sleeping process is transferred to step S5；
Step S4：Small base station transmitting power is reduced, and continues to monitor the cell load of small base station, when detecting that new user enters
And the grade of load it is constant when, judge whether the user increases positioned at cell edge if the user is located at cell edge
Base station transmitting power, and it is transferred to step S5, if the user is located at center of housing estate, small base station is remained stationary；It is new when detecting
User enter and the grade of load enters step S7 when changing；
Step S5：" inter-cell interference instruction " information that small base station is sent according to adjacent cell judges what this cell brought adjacent cell
The height of interference level；If it is low interference level, sleeping process is exited, enters step S6；If it is high interference levels,
It determines that small base station enters dormant state, is transferred to step S8；
Step S6：Cell load is persistently detected in small base station, if detecting that new user accesses and the grade of load is caused to become
Change, is transferred to step S7；If the grade of load is continuously light load, " inter-cell interference instruction " information received is updated, is sentenced
The height for the interference level that this cell of breaking brings adjacent cell；
Step S7：If small base station detects that the grade of load is intermediate part load or full load, this cell is persistently detected in small base station
Load；
Step S8：Small base station home subscriber is switched to neighbouring small base station or macro base station, after completing user's switching, small base station into
Enter dormant state.
2. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：It is small
The cell load grade of base station includes extra-light loading, light load, intermediate part load and full load, and small base station is by the load etc. of adjacent cell
Grade information is recorded in the Automatic Neighboring Relation of small base station.
3. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：Step
In rapid S3, judges whether there is user by following two methods and be located at cell edge position：
A, this cell RSRP information and adjacent cell RSRP information for comparing user's report, are judged by the difference of the two information
Whether the user is located at cell edge；
B, judge whether user is located at cell edge by user coordinates location information.
4. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：Step
In rapid S5, " inter-cell interference instruction " information that small base station is sent according to adjacent cell judges the interference that this cell brings adjacent cell
The method of horizontal height is as follows：
Adjacent cell sets an interference threshold threshold value, and adjacent cell home subscriber reports the RSRP of the small base station detected, if small
The RSRP of base station is more than interference threshold threshold value, when adjacent cell sends " inter-cell interference instruction " information, in corresponding PRB resources
It is identified, after small base station receives " inter-cell interference instruction " information, PRB number of the statistics more than interference threshold threshold value；When
PRB numbers more than interference threshold threshold value are more than certain proportion, then it is assumed that are high interference levels, otherwise it is assumed that being low interference water
It is flat.
5. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：Step
In rapid S5, " inter-cell interference instruction " information that small base station is sent according to adjacent cell judges the interference that this cell brings adjacent cell
The method of horizontal height is as follows：
Adjacent cell compares the interference threshold threshold value of the RSRP and setting for the small base station measured that its home subscriber reports, and counts super
Cross the PRB numbers of interference threshold value；If it exceeds the PRB numbers of interference threshold threshold value are more than certain proportion, it is determined that for height
Otherwise interference level is determined as low interference level, and the height of interference level is identified in " inter-cell interference instruction " information.
6. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：Only
Have when " inter-cell interference instruction " information of adjacent cell changes, it just can be by updated " inter-cell interference instruction " information
Resend to small base station.
7. the method according to claim 1 for controlling small base station dormancy based on load and interference level, it is characterised in that：Step
In rapid S8, be home subscriber select to switch the principle of base station for：The small base station of preferential selection intermediate part load, if do not conformed to
The small base station asked, then be switched to macro base station.
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| CN104754707B (en) * | 2013-12-26 | 2019-10-18 | 索尼公司 | Device and method for controlling the change of the working condition of cell |
| CN106714197B (en) * | 2015-07-16 | 2020-01-31 | 普天信息技术有限公司 | Method and system for improving inter-cell interference jitter |
| CN106912088B (en) * | 2015-12-22 | 2019-05-14 | 中国联合网络通信集团有限公司 | A kind of control method and device of small base station dormancy |
| CN108616906A (en) * | 2016-12-28 | 2018-10-02 | 大唐移动通信设备有限公司 | A kind of LTE base station power-economizing method and device |
| CN108777870B (en) * | 2018-06-06 | 2021-06-08 | 湖北邮电规划设计有限公司 | LTE high-load cell discrimination method and system based on Pearson coefficient |
| CN117242719A (en) * | 2021-05-10 | 2023-12-15 | 株式会社Ntt都科摩 | Electronic equipment in high-altitude platform station-ground communication system |
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| Energy Efficiency Gains Through Traffic Offloading And Traffic Expansion In Joint Macro Pico Deployment;Malik Wahaj Arshad等;《2012 IEEE Wireless Communications and Networking Conference: Mobile and Wireless Networks》;20121231;全文 * |
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