CN104469817A - Method for controlling small cell to hibernate based on load and interference level - Google Patents
Method for controlling small cell to hibernate based on load and interference level Download PDFInfo
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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
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Abstract
The invention provides a method for controlling a small cell to hibernate based on a load and an interference level. The method comprises the following steps: judging the load capacity of a current cell, and starting a process for judging whether the presence of the small cell brings a certain degree of downlink interference on peripheral neighboring cells or not when the load capacity reaches a certain level and a small cell user is positioned on the edge of the cell; and if the small cell brings a certain degree of interference on the peripheral neighboring cells, allowing the small cell to enter a hibernation state, and switching a home user of the small cell to an appropriate cell. According to the method for controlling the small cell to hibernate based on the load and the interference level, the small cell in a hierarchical networking scene is controlled to enter the hibernation state through adjustment of the service load of the cell and the generated interference level, so that inference in the hierarchical networking scene, particularly the downlink interference caused by a reference signal and the like is effectively lowered; the system throughput is increased; effective running of the system is ensured; energy consumption is saved; and green communication is realized.
Description
Technical field
The invention belongs to the technical field of forth generation mobile communications network, especially, relate to a kind of method controlling little base station dormancy based on load and interference level.
Background technology
The research that current 3GPP R12 carries out " Small Cell Enhancements (SCE) for E-UTRA and E-UTRAN – Physical-layer Aspects " (the medium and small cell physical layer of E-UTRA network strengthens).Wherein, the effective operation for little base station proposes to propose effective interference coordination mechanism for changeable business, and pay close attention to the dynamic dormancy in little base station and activation within the physical layer.Wherein, resting state refers to that the down channel of closing base station is launched, and no longer sends any reference signal (ReferenceSignal, RS).
In R12 in order to improve throughput of system will in the macro base station coverage area of high flow capacity the little base station of dense deployment, with the load of this balanced macro base station.But more interference will be brought in the little base station of dense deployment, make interference environment more complicated, dominant interferer will be not only one, but multiple, also be not only that macro base station can bring descending interference, also can produce strong descending interference between little base station.Therefore, in order to reduce or eliminate interference, can close when little base station does not have user, make it enter resting state; And when user enters little base station range, then activate little base station, avoid covering leak.Can interference be reduced like this, also can save energy consumption, realize green communications.
Mainly dynamic conditioning is carried out according to business model or service traffics at present for the dormancy of the little base station of layering networking.For example, daytime, service traffics were large, and base station is all opened, and when evening, service traffics reduced, then closed portion base station.In 3GPP standardization meeting, the layering networking for the little base station of dense deployment proposes can close little base station when traffic carrying capacity reduces to reduce interference, and network is effectively run.But concrete scheme is not discussed further.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of method controlling little base station dormancy based on load and interference level, it is for the Hierarchical Network scene of the little base station of dense deployment, consider from cell load amount and interference level two dimensions, when little base station, home subscriber is less, and its existence causes various interference, during the interference that the downlink reference signal of especially little base station brings, make little base station enter resting state, thus reach the object reducing interference, save energy consumption and raising network operation efficiency.
For achieving the above object and other relevant objects, the invention provides a kind of method controlling little base station dormancy based on load and interference level, at least comprise the following steps:
Step S1: mutual cell load class information between little base station, little base station continues to detect this cell load;
Step S2: when little base station detect the grade of load of this community be intermediate part load and full load time, little base station continue detect this cell load; When little base station detects that this cell load grade is extra-light loading, determine that little base station enters resting state, proceed to step S8; When detecting that this cell load grade is underload when little base station, enter step S3;
Step S3: judge whether have user to be positioned at cell edge position in the home subscriber of little base station; If do not have user to be positioned at cell edge, little base station ingoing power regulates process, proceeds to step S4; If there is user to be positioned at cell edge, little base station initiated sleeping process, proceeds to step S5;
Step S4: reduce little base station transmitting power, and continue to monitor the cell load of little base station, when detecting that new user enters and the grade of load is constant, judge whether whether this user is positioned at cell edge, if this user is positioned at cell edge, then increase base station transmitting power, and proceed to step S5, if this user is positioned at center of housing estate, then remain stationary in little base station; When detecting that new user enters and the grade of load changes, enter step S7;
Step S5: little base station judges the height of this community whether to the interference level that adjacent cell is brought according to " presence of intercell interference instruction " information that adjacent cell sends; If be low interference level, then exit sleeping process, enter step S6; If be high interference levels, then determine that little base station enters resting state, proceed to step S8;
Step S6: little base station continues detected cells load, if detect that new user accesses and causes the grade of load to change, proceeds to step S7; If the grade of load is continuously underload, then upgrades " presence of intercell interference instruction " information received, judge the height of this community to the interference level that adjacent cell is brought;
Step S7: if little base station detects that the grade of load is intermediate part load or full load, then little base station continues to detect this cell load;
Step S8: little base station home subscriber is switched to contiguous little base station or macro base station, after completing user switches, little base station enters resting state.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: the cell load grade of little base station comprises extra-light loading, underload, intermediate part load and full load, the grade of load information of adjacent cell is recorded in the Automatic Neighboring Relation of little base station by little base station.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: in step S3, judged whether that user is positioned at cell edge position by following two kinds of methods:
By the difference of these two information, A, this community RSRP information comparing user's report and adjacent cell RSRP information, judge whether this user is positioned at cell edge;
B, judge whether user is positioned at cell edge by user coordinates positional information.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: in step S5, " presence of intercell interference instruction " information that little base station sends according to adjacent cell judges that whether this community is as follows to the method for the height of the interference level that adjacent cell is brought:
Adjacent cell sets an interference threshold threshold value, adjacent cell home subscriber reports the RSRP of the little base station detected, if the RSRP of little base station exceedes interference threshold threshold value, when adjacent cell sends " presence of intercell interference instruction " information, at the enterprising line identifier of PRB resource of correspondence, after information that little base station receives " presence of intercell interference instruction ", statistics exceedes the PRB number of interference threshold threshold value; When the PRB number exceeding interference threshold threshold value exceedes certain proportion, then think high interference levels, otherwise think low interference level.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: in step S5, " presence of intercell interference instruction " information that little base station sends according to adjacent cell judges that whether this community is as follows to the method for the height of the interference level that adjacent cell is brought:
Adjacent cell compares the RSRP of the little base station measured and the interference threshold threshold value of setting that its home subscriber reports, and statistics exceedes the PRB number of interference threshold threshold value; If the PRB number exceeding interference threshold threshold value exceedes certain proportion, be then defined as high interference levels, otherwise be defined as low interference level, and identify the height of interference level in " presence of intercell interference instruction " information.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: only have when " presence of intercell interference instruction " information of adjacent cell changes, " presence of intercell interference instruction " information after renewal can be resend little base station.
According to the above-mentioned method controlling little base station dormancy based on load and interference level, wherein: in step S8, selecting the principle of base station shifting for home subscriber is: the little base station of prioritizing selection intermediate part load, if do not have satisfactory little base station, is then switched to macro base station.
As mentioned above, the method controlling little base station dormancy based on load and interference level of the present invention, has following beneficial effect:
(1) the present invention is by the judgement with the interference level produced of the business load of this community, under carrying out control hierarchy networking scene, whether little base station enters resting state, thus the interference effectively reduced in layering networking scene, especially the descending interference that brings such as reference signal, improve throughput of system, ensure that effective operation of system, and energy efficient, realize green communications;
(2) the present invention is applicable to LTE-A network system, can be applied in the network of different capacity base station composition, also be applicable in the hybrid network of other system by different capacity base station coverage.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of the layering networking of the little base station of dense deployment in the macro base station coverage area of high flow capacity in forth generation mobile communication system.
Fig. 2 is shown as the structural representation in the layering networking of the little base station of dense deployment in the macro base station coverage area of high flow capacity in forth generation mobile communication system after a certain little base station dormancy;
Fig. 3 is shown as the flow chart controlling the method for little base station dormancy based on load and interference level of the present invention.
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Under the layering networking scene of the little base station of the present invention's dense deployment in macro base station coverage area, control the dormancy of little base station based on load, customer location and interference level.First little base station judges the load capacity of this community, and when load capacity reaches certain level, and when little base station user is positioned at cell edge, whether the existence starting the little base station of judgement brings the process of descending interference to a certain degree to periphery adjacent cell; If determine that little base station brings interference to a certain degree to periphery adjacent cell, then little base station enters resting state, and switches its home subscriber to suitable base station.
Wherein, the load capacity of little base station is set to following 4 grades: extra-light loading, underload, intermediate part load and full load.By the mutual grade of load information of X2 interface between little base station, the grade of load information come alternately is recorded in the Automatic Neighboring Relation of little base station simultaneously.When the grade of load of little base station adjacent cell changes, upgrade the grade of load information in the Automatic Neighboring Relation of little base station.If little base station is extra-light loading, then determine that it enters resting state; If be underload, then judge in little base station, whether have user to be positioned at cell edge.If there is user to be positioned at cell edge, starts and differentiate that the process of descending interference is brought in little base station whether to adjacent cell; If little base station no user is positioned at cell edge, then regulate little base station to suitable transmitting power.
If determine, little base station enters resting state, and the little base station of neighbours of its home subscriber prioritizing selection intermediate part load switches, if do not have satisfactory little base station, is then switched to macro base station, and after user has switched, little base station enters resting state.
What Fig. 1 described is the structural representation of the layering networking of the little base station of dense deployment in the macro base station coverage area of high flow capacity in forth generation mobile communication system.Wherein, hierarchical network is on the basis of the macrocellular network be made up of macro base station, adds that the little base station of multiple low-power (small cell, sc) covers, and little base station dense deployment, form the multitiered network of different capacity base station coverage.As shown in Figure 2, after startup controls based on load and interference level, little base station sc7 enters the requirement of resting state owing to meeting, under former little base station sc7, home subscriber is switched to suitable base station, user UE2 switching enters contiguous little base station sc1, user UE3 switching enters contiguous little base station sc2, and little base station sc7 enters resting state.
With reference to Fig. 3, of the present invention based on load and interference level control little base station dormancy method specifically comprise the following steps:
Step S1: little base station continues to monitor this cell load, be recorded in Automatic Neighboring Relation (the Automatic Neighbor Relationship of little base station by X2 interface mutual cell load class information and by the grade of load information of adjacent cell between little base station, ANR) in, and this information is upgraded when the adjacent cell grade of load changes.
Step S2: when little base station detect the grade of load of this community be intermediate part load and full load time, little base station continue detect this cell load; When little base station detects that this cell load grade is extra-light loading, determine that little base station enters resting state, proceed to step S8; When little base station detects that this cell load grade is underload, proceed to step S3.
Step S3: the distribution first judging the home subscriber of little base station, has determined whether that user is positioned at cell edge position.Wherein, judged whether that user is positioned at cell edge position by following two kinds of methods:
(1) compare this community RSRP information and the adjacent cell RSRP information of user's report, when the difference of these two values are at certain interval range, then judge that user is positioned at cell edge;
(2) little base station obtains user coordinates positional information, judges whether user is positioned at cell edge.
If do not have user to be positioned at cell edge, little base station ingoing power regulates process, proceeds to step S4; If there is user to be positioned at cell edge, little base station initiated sleeping process, proceeds to step S5;
Step S4: owing to not having user to be positioned at cell edge in little base station, therefore suitably reduce little base station transmitting power, reduce its coverage, the descending interference that periphery adjacent cell is brought can be reduced like this, also can save energy consumption.Little base station continues to monitor cell load, when detecting that new user enters and the grade of load is constant, judge whether whether this user is positioned at cell edge by customer position information, if be positioned at cell edge, then increase base station transmitting power, and proceed to step S5, if be positioned at center of housing estate, then continue to remain stationary; When detecting that new user enters and the grade of load changes, enter step S7;
Step S5: if there is user to be positioned at cell edge, then start sleeping process, first judges whether this community brings descending interference to adjacent cell.When adjacent cell detects that this little base station is underload by the record in ANR, " presence of intercell interference instruction " information that sends is to little base station.Wherein, only have when " presence of intercell interference instruction " information changes, just upgrade and be sent to little base station.
In the present invention, judge by following two kinds of methods the interference level that this community is brought adjacent cell:
(1) adjacent cell sets an interference threshold threshold value, adjacent cell home subscriber reports the RSRP of the little base station detected, if the RSRP of little base station exceedes interference threshold threshold value, when adjacent cell sends " presence of intercell interference instruction " information, at the enterprising line identifier of PRB resource of correspondence, after information that little base station receives " presence of intercell interference instruction ", statistics exceedes the PRB number of interference threshold threshold value; When the PRB number exceeding interference threshold threshold value exceedes certain proportion, then think high interference levels, otherwise think low interference level;
(2) adjacent cell compares the RSRP of the little base station measured and the interference threshold threshold value of setting that its home subscriber reports, and statistics exceedes the PRB number of interference threshold threshold value; If this PRB number exceedes some ratios, then determine that interference rank is for high, otherwise determine that interference rank is low, and identify the height of interference level in " presence of intercell interference instruction " information being sent to little base station.
The height of this community to the interference level that adjacent cell is brought is determined according to this information after receiving " presence of intercell interference instruction " information of adjacent cell in little base station; If be low interference level, then exit sleeping process, enter step S6; If be high interference levels, then determine that little base station enters resting state, proceed to step S8;
Step S6: little base station continues detected cells load, if detect that new user accesses and causes the grade of load to change, proceeds to step S7; If the grade of load is continuously underload, then upgrades " presence of intercell interference instruction " information received, judge the height of this community to the interference level that adjacent cell is brought;
Step S7: if little base station detects that the grade of load is intermediate part load or full load, terminate little base station dormancy process, meanwhile, little base station continues to detect this cell load;
Step S8: little base station is determined to enter resting state, its home subscriber is switched to contiguous little base station or macro base station, after completing user switches, little base station enters resting state.Wherein, the principle of its home subscriber selection base station shifting is: the little base station of prioritizing selection intermediate part load, if do not have satisfactory little base station, is then switched to macro base station.
In sum, the method controlling little base station dormancy based on load and interference level of the present invention is by the business load of this community and the judgement of the interference level produced, under carrying out control hierarchy networking scene, little base station enters resting state, thus the interference effectively reduced in layering networking scene, especially the descending interference that brings such as reference signal, improves throughput of system, ensure that effective operation of system, and energy efficient, realize green communications.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (7)
1. control a method for little base station dormancy based on load and interference level, it is characterized in that, at least comprise the following steps:
Step S1: mutual cell load class information between little base station, little base station continues to detect this cell load;
Step S2: when little base station detect the grade of load of this community be intermediate part load and full load time, little base station continue detect this cell load; When little base station detects that this cell load grade is extra-light loading, determine that little base station enters resting state, proceed to step S8; When detecting that this cell load grade is underload when little base station, enter step S3;
Step S3: judge whether have user to be positioned at cell edge position in the home subscriber of little base station; If do not have user to be positioned at cell edge, little base station ingoing power regulates process, proceeds to step S4; If there is user to be positioned at cell edge, little base station initiated sleeping process, proceeds to step S5;
Step S4: reduce little base station transmitting power, and continue to monitor the cell load of little base station, when detecting that new user enters and the grade of load is constant, judge whether whether this user is positioned at cell edge, if this user is positioned at cell edge, then increase base station transmitting power, and proceed to step S5, if this user is positioned at center of housing estate, then remain stationary in little base station; When detecting that new user enters and the grade of load changes, enter step S7;
Step S5: little base station judges the height of this community whether to the interference level that adjacent cell is brought according to " presence of intercell interference instruction " information that adjacent cell sends; If be low interference level, then exit sleeping process, enter step S6; If be high interference levels, then determine that little base station enters resting state, proceed to step S8;
Step S6: little base station continues detected cells load, if detect that new user accesses and causes the grade of load to change, proceeds to step S7; If the grade of load is continuously underload, then upgrades " presence of intercell interference instruction " information received, judge the height of this community to the interference level that adjacent cell is brought;
Step S7: if little base station detects that the grade of load is intermediate part load or full load, then little base station continues to detect this cell load;
Step S8: little base station home subscriber is switched to contiguous little base station or macro base station, after completing user switches, little base station enters resting state.
2. the method controlling little base station dormancy based on load and interference level according to claim 1, it is characterized in that: the cell load grade of little base station comprises extra-light loading, underload, intermediate part load and full load, the grade of load information of adjacent cell is recorded in the Automatic Neighboring Relation of little base station by little base station.
3. the method controlling little base station dormancy based on load and interference level according to claim 1, is characterized in that: in step S3, has judged whether that user is positioned at cell edge position by following two kinds of methods:
By the difference of these two information, A, this community RSRP information comparing user's report and adjacent cell RSRP information, judge whether this user is positioned at cell edge;
B, judge whether user is positioned at cell edge by user coordinates positional information.
4. the method controlling little base station dormancy based on load and interference level according to claim 1, it is characterized in that: in step S5, " presence of intercell interference instruction " information that little base station sends according to adjacent cell judges that whether this community is as follows to the method for the height of the interference level that adjacent cell is brought:
Adjacent cell sets an interference threshold threshold value, adjacent cell home subscriber reports the RSRP of the little base station detected, if the RSRP of little base station exceedes interference threshold threshold value, when adjacent cell sends " presence of intercell interference instruction " information, at the enterprising line identifier of PRB resource of correspondence, after information that little base station receives " presence of intercell interference instruction ", statistics exceedes the PRB number of interference threshold threshold value; When the PRB number exceeding interference threshold threshold value exceedes certain proportion, then think high interference levels, otherwise think low interference level.
5. the method controlling little base station dormancy based on load and interference level according to claim 1, it is characterized in that: in step S5, " presence of intercell interference instruction " information that little base station sends according to adjacent cell judges that whether this community is as follows to the method for the height of the interference level that adjacent cell is brought:
Adjacent cell compares the RSRP of the little base station measured and the interference threshold threshold value of setting that its home subscriber reports, and statistics exceedes the PRB number of interference threshold threshold value; If the PRB number exceeding interference threshold threshold value exceedes certain proportion, be then defined as high interference levels, otherwise be defined as low interference level, and identify the height of interference level in " presence of intercell interference instruction " information.
6. the method controlling little base station dormancy based on load and interference level according to claim 1, it is characterized in that: only have when " presence of intercell interference instruction " information of adjacent cell changes, " presence of intercell interference instruction " information after renewal can be resend little base station.
7. the method controlling little base station dormancy based on load and interference level according to claim 1, it is characterized in that: in step S8, selecting the principle of base station shifting for home subscriber is: the little base station of prioritizing selection intermediate part load, if do not have satisfactory little base station, is then switched to macro base station.
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| 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 |
| CN108777870A (en) * | 2018-06-06 | 2018-11-09 | 湖北邮电规划设计有限公司 | LTE high load capacity cell discriminating methods based on Pearson's coefficient and system |
| 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 |
| WO2022236636A1 (en) * | 2021-05-10 | 2022-11-17 | 株式会社Ntt都科摩 | Electronic device in high-altitude platform station-ground communication system |
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