CN102065488B - Optimized inter-cell interference coordination method and base station - Google Patents
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Abstract
The invention discloses an optimized inter-cell interference coordination method and a base station. The method comprises the following steps of: when a source base station detects that the interference of a source cell on a PRB (Physical Resource Block) exceeds the high interference threshold of UL OI (Up Link Interference-Overload Indication) but the occupancy rate of the PRB by the source cell is lower than a preset value, marking the PRB as a potential interference state in a UL OI cell in load indicating information sent to a target base station, and starting a timer T1; if the interference of the source cell on the PRB is always detected to exceed the high interference threshold of the UL OI before timeout is indicated on the timer Ti, marking the PRB, in the subsequently-sent load indicating information, still as the potential interference state; and after the target base station receives the load indicating information, starting a timer T2, and reducing the interference of the PRB marked as the potential interference state before timeout is indicated on the timer T2. The technical scheme provided by the invention is beneficial to the prevention of resource waste.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of inter-cell interference coordination method and a kind of base station of optimization.
Background technology
Long Term Evolution (LTE, Long Term Evolution) system adopts flat network configuration.Fig. 1 is existing LTE network structure.As shown in Figure 1, radio access network of universal mobile communication system (the E-UTRAN of evolution, Evolved Universal Terrestrial RadioAccess Network) consisted of by serving BS (eNB, evolved NodeB), interconnected by X2 interface between eNB; Evolved Packet Core (Evolved Packet Corenet work, EPC) comprise gateway (S-GW, Serving Gateway) and Mobility Management Entity (MME, Mobility Management Entity), mutual by S1 interface and eNB.Wherein the ICIC function is positioned at eNB.
In the LTE system based on OFDM (OFDM, Orthogonal Frequency DivisionMultiplexing), affect the main interference of systematic function from the interference of minizone.Therefore interference coordination (ICIC, the Inter-Cell InterferenceCoordination) technology of minizone is one of effective means that improves systematic function.ICIC remains on the interference level between the residential quarter under controlled state by Radio Resource is managed, and especially in the cell boarder area, need to do a little special management to Radio Resource, to satisfy the lifting demand of LTE system edges customer service quality.Inter-Cell Interference Coordination essence is a kind of many cell radio resources management function, and it need to be considered simultaneously from the resource using status information of a plurality of residential quarters and business load state information.Uplink and downlink can be adopted different inter-cell interference coordination methods.
The load Indication message (LOAD INFORMATION) of existing LTE system, be used between the neighbor cell of the same frequency controlled different base stations (eNB), transmit load and interference coordination information, for completing RRM (RRM, RadioResource management) process provides important information, and message process as shown in Figure 2.
Comprise cell information in load Indication message (LOAD INFORMATION), and three relevant cells (IE) of indication disturbed condition:
Up high interference indication (UL HII, Up link High Interference Indication) cell: by the mode of bit mapping (bitmap), each Physical Resource Block (PRB of sending node eNB1 is provided, Physical resource block) interference sensitivity, indication the uplink interference of this PRB higher than or lower than a certain threshold value.The eNB2 that receives this message should avoid having indicated the PRB of high interference sensitivity into its Cell Edge User equipment (UE, User Equipment) distributes to send as far as possible.
Uplink interference overload indication (UL OI, Up link Interference OverloadIndication) cell: by the mode of bit mapping, point out the be disturbed degree of residential quarter on all Resource Block of message sending node, be divided into high interference, middle interference, the low Three Estate that disturbs.
Relative Narrowband TX Power (RNTP, Relative Narrowband Tx Power) cell: whether the downlink transmission power that has provided each PRB is lower than in information such as RNTP threshold value and antenna ports.
For convenience, the residential quarter that will send in this application the load Indication message is called the cell-of-origin, the base station of controlling this cell-of-origin is called source base station, the residential quarter that receives the load Indication message is called Target cell, the base station of controlling this Target cell is called target BS.
measurement for the uplink interference overload indication UL OI that reports Target cell is completed by source base station, interference on each PRB and noise are measured, have such a case: certain PRB is not taken by the cell-of-origin, but it is too high (in actual applications that source base station records this PRB interference, for different statistical methods, certain PRB not by the cell-of-origin take may show as the cell-of-origin to the occupancy of this PRB lower than certain threshold value, but the interference that records frequently surpasses UL OI high interference thresholding), be that reports the be disturbed degree of cell-of-origin on this PRB in ULOI high interference? the below discusses respectively:
Report scheme 1: report to be high interference
According to current standard code, satisfied the trigger condition that UL OI reports, report UL OI in load Indication message (LOAD INFORMATION), and the PRB of correspondence is designated high interference.The target BS that receives this message is processed this PRB according to this high interference indication meeting, for example reduce the transmitting power of the UE that takies this PRB in Target cell to reduce the interference to the cell-of-origin, perhaps Target cell is dispatched on other PRB in the business on this PRB.But this method may cause that new overload situations occurs, and the source base station of the actual UL of reporting OI is not dispatched this PRB.
Report scheme 2, report as low and disturb
If source base station thinks that this overload situations can not exert an influence to its scheduling, may report UL OI in load Indication message (LOAD INFORMATION), and this PRB is designated low the interference in UL OI.The target BS that receives this message learn this low disturb indication after, can not carry out any falling to this PRB and disturb and process.Source base station can be because of the interference of this PRB overload, all the time can not this PRB of edge user assignment, until target side finishes taking this PRB.
Can find out, all there is the problem of the wasting of resources in above-mentioned two schemes, the minizone edge customer count difference large time, this problem performance more outstanding.
Summary of the invention
The invention provides a kind of inter-cell interference coordination method of optimization, the method can be avoided the waste of resource.
The present invention also provides a kind of base station, and the waste of resource can be avoided in this base station.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of inter-cell interference coordination method of optimization, the method is applicable to control respectively between two base stations of two adjacent residential quarters of same frequency, described two base stations are respectively source base station and target BS, described two residential quarters are respectively cell-of-origin and Target cell, and the method comprises:
When source base station detects the high interference threshold value that cell-of-origin suffered interference on a Physical Resource Block PRB has surpassed uplink interference overload indication UL OI, but the cell-of-origin is to the occupancy of this PRB during lower than preset value, in the up high interference indication information element of source base station in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1;
If before timer T1 is overtime, source base station detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, and source base station still is labeled as the potential interference state with this PRB in the up high interference indication information element in the follow-up load Indication message that sends to target BS;
After target BS receives the described load Indication message of source base station transmission, start timer T2, and before timer T2 is overtime, the PRB that is marked as the potential interference state in the up high interference indication information element in described load Indication message is fallen to disturb process.
The method further comprises: if before timer T1 is overtime, source base station detects the cell-of-origin, and suffered interference is lower than the high interference threshold value of UL OI on this PRB, and the demand according to the cell-of-origin takies this PRB.
The method further comprises: if before timer T2 is overtime, target BS continues to receive that source base station sends this PRB is labeled as the load Indication message of potential interference, and target BS can not restart T2.
In said method, the timing of timer T1 and timer T2 equates, and this timing is static configuration in advance.
In said method, the timing of timer T1 and timer T2 is greater than minimum update time of the interval of UL OI cell.
The invention also discloses this a kind of base station, two adjacent residential quarters of same frequency are called source base station and target BS, when controlling the source base station of cell-of-origin, this base station comprises when this base station: detection module, load Indication message sending module, timer T1, wherein:
Detection module, be used for cell-of-origin suffered interference on a Physical Resource Block PRB being detected and surpassed the high interference threshold value of uplink interference overload indication UL OI, but the cell-of-origin during lower than preset value, sends described notification message to load Indication message sending module to the occupancy of this PRB;
Load Indication message sending module, be used for after the described PRB that receives the detection module transmission is in the notification message of potential interference state, in up high interference indication information element in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1; If before timer T1 is overtime, detection module detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, still in the up high interference indication information element in the follow-up load Indication message that sends to target BS, this PRB is labeled as the potential interference state;
When controlling the target BS of Target cell, this base station also comprises when this base station: load Indication message processing module and timer T2, wherein:
Load Indication message processing module, be used for receive that source base station sends after up high interference indication information element will specify PRB to be labeled as the load Indication message of potential interference state, start timer T2, and before timer T2 is overtime, process falling at described appointment PRB to disturb.
In above-mentioned base station, described load Indication message sending module also is used for before timer T1 is overtime, and suffered interference is lower than the high interference threshold value of ULOI on this PRB if detection module detects the cell-of-origin, and the demand according to the cell-of-origin takies this PRB.
In above-mentioned base station, described load Indication message processing module also is used for before timer T2 is overtime, if continue to receive that source base station sends described appointment PRB is labeled as the load Indication message of potential interference, can not restart T2.
In above-mentioned base station, the timing of timer T1 and timer T2 equates.
In above-mentioned base station, the timing of timer T1 and timer T2 is greater than minimum update time of the interval of UL OI cell.
by as seen above-mentioned, the present invention is this has surpassed when source base station detects cell-of-origin suffered interference on a Physical Resource Block PRB high interference threshold value that the uplink interference overload is indicated UL OI, but the cell-of-origin is to the occupancy of this PRB during lower than preset value, in the up high interference indication information element of source base station in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1, if before timer T1 is overtime, source base station detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, and source base station still is labeled as the potential interference state with this PRB in the up high interference indication information element in the follow-up load Indication message that sends to target BS, and after target BS receives the described load Indication message that source base station sends, start timer T2, and before timer T2 is overtime, the PRB that is marked as the potential interference state in up high interference indication information element in described load Indication message is fallen disturb the technical scheme of processing, by increase the definition of a kind of " potential interference " state in the uplink interference overload indication information element of load Indication message, and increase corresponding timer mechanism, solved on current vacant frequency domain resource disturb too high, be the high interference overload if report, the adjacent area wasting of resources, otherwise, the problem of the wasting of resources may appear in this residential quarter.
Description of drawings
Fig. 1 is existing LTE network structure;
Fig. 2 is the process of transmitting schematic diagram of existing load Indication message;
Fig. 3 is the flow chart of the inter-cell interference coordination method of a kind of optimization in the present invention;
Fig. 4 is the composition structure chart of a kind of base station in the embodiment of the present invention.
Embodiment
Fig. 3 is the flow chart of the inter-cell interference coordination method of a kind of optimization in the present invention.The method is applicable to control respectively between two base stations of two adjacent residential quarters of same frequency, and described two base stations are respectively source base station and target BS, and described two residential quarters are respectively cell-of-origin and Target cell, and the method comprises:
In this step, the cell-of-origin lower than preset value, refers generally to the cell-of-origin situation lower to the occupancy of this PRB to the occupancy of this PRB, and namely described preset value is a lower value.
In addition, if before timer T1 is overtime, source base station detects the cell-of-origin, and suffered interference is lower than the high interference threshold value of UL OI on this PRB, and the demand according to the cell-of-origin takies this PRB.After timer T1 is overtime, if the high interference threshold value that cell-of-origin suffered interference on a PRB surpasses UL OI again occurs, but the cell-of-origin is to the occupancy of this PRB situation lower than preset value, source base station starts scheme of the present invention (being source base station execution in step 301 and 302) again, if this situation do not occur, source base station carries out conventional processing according to existing scheme.
In addition, if before timer T2 is overtime, target BS continues to receive that source base station sends this PRB is labeled as the load Indication message of potential interference, and target BS can not restart T2, but carries out corresponding the processing according to the original initial timer that starts all the time.After timer T2 is overtime, this PRB is labeled as the load Indication message of potential interference state if target BS receives again that source base station sends, target BS starts scheme of the present invention (being target BS execution in step 303) again, if do not receive such message, target BS carries out conventional processing according to existing scheme.
In this step, target BS falls disturb to process to PRB and comprises: reduce the transmitting power of UE that Target cell takies this PRB to reduce the interference to the cell-of-origin, perhaps Target cell is dispatched on other PRB in the business on this PRB.
Need to prove, scheme shown in Figure 3 in the cell-of-origin on a PRB suffered interference surpassed the high interference threshold value of uplink interference overload indication UL OI, but the cell-of-origin is enabled during lower than preset value the occupancy of this PRB, and the sequence limit on not free between step 302 and step 303.
Can find out from step 302 shown in Figure 3, in technical scheme of the present invention, bit mapping mode for the UL OI cell in the load Indication message, except existing high interference, middle interference and three kinds of states of low interference, increased a kind of " potential interference " state, the definition of UL OI cell is as shown in table 1:
Table 1
As seen from Table 1, high interference originally (high interference), middle interference (mediuminterference) and low (low interference) the three kinds of states that disturb can identify with two bits.After having increased potential interference (potential interference) state, be total up to 4 states, still can identify this 4 kinds of states with two bits, need not to increase extra signaling consumption.
In preferred embodiment of the present invention, the timing of timer T1 and timer T2 equates, and this timing is static configuration in advance, for example can carry out static configuration by operation and maintenance (OAM) center.The timing of timer T1 and timer T2 is generally got minimum update time of the interval greater than described UL OI cell.
Provide the composition structure of a kind of base station in the present invention based on above-described embodiment.
Fig. 4 is the composition structure chart of a kind of base station in the embodiment of the present invention.Two adjacent residential quarters of same frequency are called source base station and target BS, and when controlling the source base station of cell-of-origin, this base station comprises when this base station: detection module 401, load Indication message sending module 402, timer T1 403, wherein:
Load Indication message sending module 402, be used for after the described PRB that receives detection module 401 transmissions is in the notification message of potential interference state, in up high interference indication information element in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1 403; If before timer T1 403 is overtime, detection module 401 detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, still in the up high interference indication information element in the follow-up load Indication message that sends to target BS, this PRB is labeled as the potential interference state;
When controlling the target BS of Target cell, this base station also comprises when this base station: load Indication message processing module 404 and timer T2 405, wherein:
Load Indication message processing module 404, be used for receive that source base station sends after up high interference indication information element will specify PRB to be labeled as the load Indication message of potential interference state, start timer T2 405, and before timer T2 405 is overtime, process falling at described appointment PRB to disturb.
In base station shown in Figure 4, described load Indication message sending module 402, also be used for before timer T1 403 is overtime, suffered interference is lower than the high interference threshold value of UL OI on this PRB if detection module 401 detects the cell-of-origin, and the demand according to the cell-of-origin takies this PRB.
In base station shown in Figure 4, described load Indication message processing module 402 also is used for before timer T2 is overtime, if continue to receive that source base station sends described appointment PRB is labeled as the load Indication message of potential interference, can not restart T2.
In base station shown in Figure 4, the timing of timer T1 and timer T2 equates.
In base station shown in Figure 4, the timing of timer T1 and timer T2 is greater than minimum update time of the interval of described high interference indication information element.
by as seen above-mentioned, the present invention is this has surpassed when source base station detects cell-of-origin suffered interference on a Physical Resource Block PRB high interference threshold value that the uplink interference overload is indicated UL OI, but the cell-of-origin is to the occupancy of this PRB during lower than preset value, in the up high interference indication information element of source base station in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1, if before timer T1 is overtime, source base station detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, and source base station still is labeled as the potential interference state with this PRB in the up high interference indication information element in the follow-up load Indication message that sends to target BS, and after target BS receives the described load Indication message that source base station sends, start timer T2, and before timer T2 is overtime, the PRB that is marked as the potential interference state in up high interference indication information element in described load Indication message is fallen disturb the technical scheme of processing, by increase the definition of a kind of " potential interference " state in the uplink interference overload indication information element of load Indication message, and increase corresponding timer mechanism, solved on current vacant frequency domain resource disturb too high, be the high interference overload if report, the adjacent area wasting of resources, otherwise, the problem of the wasting of resources may appear in this residential quarter.And technical scheme of the present invention does not increase extra signaling consumption, realizes simple.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. the inter-cell interference coordination method of an optimization, it is characterized in that, the method is applicable to control respectively between two base stations of two adjacent residential quarters of same frequency, described two base stations are respectively source base station and target BS, described two residential quarters are respectively cell-of-origin and Target cell, and the method comprises:
When source base station detects the high interference threshold value that cell-of-origin suffered interference on a Physical Resource Block PRB has surpassed uplink interference overload indication UL OI, but the cell-of-origin is to the occupancy of this PRB during lower than preset value, in the up high interference indication information element of source base station in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1;
If before timer T1 is overtime, source base station detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses UL OI all the time, and source base station still is labeled as the potential interference state with this PRB in the up high interference indication information element in the follow-up load Indication message that sends to target BS;
After target BS receives the described load Indication message of source base station transmission, start timer T2, and before timer T2 is overtime, the PRB that is marked as the potential interference state in the up high interference indication information element in described load Indication message is fallen to disturb process.
2. method according to claim 1, is characterized in that, the method further comprises:
If before timer T1 is overtime, source base station detects the cell-of-origin, and suffered interference is lower than the high interference threshold value of UL OI on this PRB, and the demand according to the cell-of-origin takies this PRB.
3. method according to claim 2, is characterized in that, the method further comprises:
If before timer T2 is overtime, target BS continues to receive that source base station sends this PRB is labeled as the load Indication message of potential interference, and target BS can not restart T2.
4. the described method of any one according to claim 1 to 3, is characterized in that,
The timing of timer T1 and timer T2 equates, and this timing is static configuration in advance.
5. method according to claim 4, is characterized in that,
The timing of timer T1 and timer T2 is greater than minimum update time of the interval of UL OI cell.
6. base station is called cell-of-origin and Target cell with two adjacent residential quarters of same frequency, it is characterized in that,
When controlling the source base station of cell-of-origin, this base station comprises when this base station: detection module, load Indication message sending module, timer T1, wherein:
Detection module, be used for cell-of-origin suffered interference on a Physical Resource Block PRB being detected and surpassed the high interference threshold value of uplink interference overload indication UL OI, but the cell-of-origin during lower than preset value, sends to load Indication message sending module the notification message that PRB is in the potential interference state to the occupancy of this PRB;
Load Indication message sending module, be used for after the described PRB that receives the detection module transmission is in the notification message of potential interference state, in up high interference indication information element in the load Indication message that sends to target BS, this PRB is labeled as the potential interference state, and starts timer T1; If before timer T1 is overtime, detection module detects the high interference threshold value that cell-of-origin suffered interference on this PRB surpasses ULOI all the time, still in the up high interference indication information element in the follow-up load Indication message that sends to target BS, this PRB is labeled as the potential interference state;
When controlling the target BS of Target cell, this base station also comprises when this base station: load Indication message processing module and timer T2, wherein:
Load Indication message processing module, be used for receive that source base station sends after up high interference indication information element will specify PRB to be labeled as the load Indication message of potential interference state, start timer T2, and before timer T2 is overtime, process falling at described appointment PRB to disturb.
7. base station according to claim 6, is characterized in that,
Described load Indication message sending module also is used for before timer T1 is overtime, and suffered interference is lower than the high interference threshold value of UL OI on this PRB if detection module detects the cell-of-origin, and the demand according to the cell-of-origin takies this PRB.
8. base station according to claim 6, is characterized in that,
Described load Indication message processing module also is used for before timer T2 is overtime, if continue to receive that source base station sends described appointment PRB is labeled as the load Indication message of potential interference, can not restart T2.
9. the described base station of any one according to claim 6 to 8, is characterized in that, the timing of timer T1 and timer T2 equates.
10. the described base station of any one according to claim 6 to 8, is characterized in that, the timing of timer T1 and timer T2 is greater than minimum update time of the interval of UL OI cell.
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| CN102833787B (en) * | 2011-06-16 | 2018-01-23 | 盐城报业科技发展有限公司 | A kind of method and system of Inter-Cell Interference Coordination |
| CN102215594B (en) * | 2011-06-24 | 2017-12-12 | 中兴通讯股份有限公司 | Dispatching method and device |
| CN103024916B (en) * | 2011-09-26 | 2015-10-07 | 中国移动通信集团公司 | A kind of method and apparatus determining uplink interference terminal |
| WO2013166722A1 (en) * | 2012-05-11 | 2013-11-14 | Renesas Mobile Corporation | Signaling and procedure for in-device co-existence |
| CN106304367B (en) * | 2015-05-21 | 2020-01-17 | 普天信息技术有限公司 | Inter-cell interference coordination method and device |
| CN108207034A (en) * | 2016-12-16 | 2018-06-26 | 夏普株式会社 | The method of transmission interference coordination information and base station |
| CN109565845B (en) * | 2017-07-24 | 2023-05-23 | 北京小米移动软件有限公司 | Method and device for controlling interference of controllable equipment |
| WO2019028750A1 (en) | 2017-08-10 | 2019-02-14 | 北京小米移动软件有限公司 | Method and device for controlling interference |
| CN111083644B (en) * | 2018-10-19 | 2021-12-10 | 成都鼎桥通信技术有限公司 | Carrier jamming detection and closing method and device in multi-channel narrow-band digital cluster system |
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