CN114554528B - Detection and optimization method for far-end interference - Google Patents
Detection and optimization method for far-end interference Download PDFInfo
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- CN114554528B CN114554528B CN202210222839.4A CN202210222839A CN114554528B CN 114554528 B CN114554528 B CN 114554528B CN 202210222839 A CN202210222839 A CN 202210222839A CN 114554528 B CN114554528 B CN 114554528B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005457 optimization Methods 0.000 title claims description 7
- 238000001514 detection method Methods 0.000 title abstract description 8
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims description 2
- 238000007726 management method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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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
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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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 invention relates to a method for detecting and optimizing remote interference, which comprises the steps of reporting an interference power value on an uplink symbol in each special time slot to a network manager through a first base station, and determining that the first base station is a high-interference cell after the network manager detects that the power value exceeds a first interference preset threshold and the service load of the whole network is lower than a second interference preset threshold. And the network manager alternately loads one or more base stations in a downlink mode according to the base station set with the first preset distance of the base stations in the low peak period of the whole network service, and monitors whether the uplink symbols of the first base station are higher than a third interference preset threshold or not so as to determine an interference source set. The network manager optimizes the base stations in the interference set by adjusting the declination angle and the like, detects whether the interference level of the first base station is lower than a threshold, and improves the performance of the first base station by adjusting the SRS position under the condition that the interference level cannot be optimized. The invention can effectively realize the rapid detection and rapid adjustment of the remote interference.
Description
Technical Field
The invention relates to the technical field of 5G/mobile communication, in particular to a detection and optimization method of far-end interference.
Background
The principle of far-end interference is an inherent problem of TDD, as shown in fig. 1, and is also why TDD systems specifically design GP isolation.
Uplink and downlink time division multiplexing of the TDD system is realized, and downlink interference uplink caused by transmission delay is avoided by setting a guard interval (GP);
when the far-end interference occurs, the downlink signal of the far-end base station still has higher strength after being transmitted for tens or hundreds of kilometers in an ultra-long distance, the signal propagation delay exceeds the GP length and falls into the uplink receiving window of the near-end base station, so that serious uplink interference is caused;
the "far-end disturbance" is generated for a reason different from that of an atmospheric waveguide, which can be regarded as a relatively special far-end disturbance. The atmospheric waveguide is a natural phenomenon which occurs under specific weather and geographic conditions, the propagation loss of a wireless signal in the atmospheric waveguide is small, the ultra-long distance propagation can be realized, and (1) the influence generally occurs over hundred km; (2) the areas where the relative fixation occurs are mainly concentrated on North China/middle/east plains, jiang Han plains, northeast plains, southwest island coasts and Bohai Bay coasts. The distance of the far-end interference is generally 30-40km, and the reasons for the generation are mainly factors such as flat topography, dense sites, over-area coverage, too high sites, open environment and the like which are easy to cause the ultra-long distance propagation of signals. Most cities throughout the country are involved in this problem. Interference difference analysis among different cities, and the topographic influence is the main factor:
planning a network: the Qingdao has more high stations and stations with smaller downdip angles relative to Guiyang and Xiamen;
geographic environment: remote interference is relatively easy to occur in wireless propagation environments in plain and seaside compared to mountain areas. If Guiyang is located in mountain areas (almost four-side mountain, the diameter of the core area is less than 20 Km), the covering depth is less than 20Km, and 'far-end interference' is difficult to occur; if the station is in Qingdao, the station is covered with 66Km deep because the station is positioned at the sea without being blocked by high mountain, and 'far-end interference' is easy to occur;
as shown in fig. 2, the far-end interfering SRS has currently caused a series of problems affecting the user experience, such as dropped lines, access failure, low rate, etc. As shown in fig. 3, the far-end interference is characterized by: (1) starting from GP, the interference presents a slope shape with high left and low right; (2) the interference level of the symbol is basically stable after the interference of 4 to 5 symbols is generally carried out; three typical voice system indexes are used for network-level interference identification in the current equipment:
index 1: power on last GP
Index 2: power on uplink Slot symbol 6
Index 3: power on last U symbol of uplink Slot
There is no automatic method in the prior art to realize the rapid detection and rapid adjustment of the far-end interference.
Disclosure of Invention
Therefore, the present invention aims to provide a method for detecting and optimizing far-end interference, which can effectively realize rapid detection and rapid adjustment of far-end interference.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for detection and optimization of far-end interference, comprising the steps of:
step S1, a first base station reports the received power in each uplink symbol in each special time slot to a network management system according to a first reporting period in a first time period
Step S2, after the network manager is higher than a first interference preset threshold for the received power of one or more uplink symbols of the first base station, the network manager configures the first base station to report the received power in each uplink symbol in each special time slot according to a first reporting period in a second time period; if the reported power is lower than the second interference threshold, the first base station is considered as a high interference cell which is interfered by the far end;
step S3, when the number of the high-interference cells accounts for the number proportion of the base stations in the same frequency band of the whole network and exceeds a preset threshold, the network manager reconfigures the frame structure of the base stations in the same frequency band to adopt more GPs, otherwise, the network manager triggers independent optimization of each high-interference base station;
step S4, the network manager determines a second base station set which is within a first preset distance range from the first base station;
step S5, the network manager traverses the second base station set, performs simultaneous downlink loading operation on one or more connected base stations, indicates the loading time length and the downlink loading proportion of the base stations through a network manager interface, and simultaneously indicates the first base station to report the receiving power of each uplink symbol in each special time slot in the time period, resumes the normal state after the base stations are loaded, and selects and replaces the next base station in the set;
step S6, namely: if the interference level of one or more symbols reported by the first base station when loading a certain batch of base stations is higher than a third interference threshold, the network manager considers the batch of scrambling base stations as potential interference sources;
step S7, the network manager instructs the base station to automatically adjust the downward inclination angle of the current interference base station through the network management interface, so that the interference to the first base station is reduced;
step S8, the network manager checks whether the received power in each uplink symbol reported by the first base station is still higher than a first interference threshold after adjustment, if so, the interference elimination is determined to be successful, otherwise, the special time slot configuration of the first base station is changed;
step S9, the first base station configures the connection state terminal to migrate the SRS resource of the connection state terminal to one or more symbols of a common uplink subframe from the last symbol or more symbols of a special time slot through RRC signaling, and simultaneously changes the configuration information corresponding to the SRS in the broadcast message.
Further, the first time period and the first reporting period are configured by a network manager.
Further, the second interference threshold is lower than the first interference threshold.
Further, the first preset distance range is a propagation distance of a certain symbol time length configured by the network management.
Further, in the step S8, the configuration of the special slot of the first base station is changed, specifically, the SRS is configured to the last symbol or symbols of the common uplink frame, and the uplink reception in the special slot is turned off.
Compared with the prior art, the invention has the following beneficial effects:
the invention can effectively realize the rapid detection and rapid adjustment of the remote interference.
Drawings
Fig. 1 is a schematic diagram of TDD remote interference;
FIG. 2 is the effect of different interference levels on the drop rate;
fig. 3 is an interference feature of far-end interference
FIG. 4 is a schematic diagram of adjusting a special slot configuration to 8:4:2;
FIG. 5 is a schematic diagram of the areas to be measured and interfered with in an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
In this embodiment, the passing network pipe finds that the gNB1 is an interfered base station, and adjusts the antenna downtilt angles of the interfering base stations gNB2-11 to solve the remote interference of the interfered base station, which specifically includes the following steps:
1) And reporting the received power in each uplink symbol in each special time slot to the network management system according to a first reporting period in the first time period by the gNB 1. The first time period is 9:00 a.m. to 5:00 a.m. and the first reporting period is 5 minutes and is configured by the network manager.
2) After the received power of the network manager on 2 uplink symbols (i.e. 13 and 14 symbols) of the gNB1 is higher than-110 dBm, the network manager configures the receiving power of each uplink symbol in each special time slot to be reported in the night of 00:00-5:00 according to 5 minutes for the gNB 1. Since the reported power is lower than-115 dBm, gNB1 is considered as a high interference cell subject to far-end interference.
3) When the number of the high-interference cells accounts for only 1% of the number of the base stations in the same frequency band of the whole network, the network manager triggers independent optimization of each high-interference base station.
4) The network manager determines a second set of base stations within 21-42 km of the distance gNB 1.
5) The network manager traverses the second base station set, carries out simultaneous downlink loading operation on 10 connected base stations, loads 50% of each time and has the duration of 10 minutes, indicates the loading duration and the downlink loading proportion of the base stations through a network manager interface, simultaneously indicates gNB1 to report the receiving power of each uplink symbol in each special time slot in the time period, restores the normal state after the base stations are loaded, and selects and replaces the next base station in the set.
6) When the interference level of gNB1 on 2 symbols reported when a certain batch of base stations are loaded is higher than the interference threshold of-115 dBm, the network manager considers that the scrambling base stations gNB2-11 are potential interference sources.
7) The network manager indicates the base station to automatically adjust the downward inclination angle of the current gNB2-11 through the network management interface, so that the interference to the gNB1 is reduced.
8) And after the network management check and adjustment, the network management determines that the interference cancellation is successful according to the fact that the received power in each uplink symbol reported by the gNB1 is lower than the interference threshold of-110 dBm.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (4)
1. A method for detecting and optimizing far-end interference, comprising the steps of:
step S1, a first base station reports the received power in each uplink symbol in each special time slot to a network management system according to a first reporting period in a first time period;
step S2, after the network manager is higher than a first interference preset threshold for the received power of one or more uplink symbols of the first base station, the network manager configures the first base station to report the received power in each uplink symbol in each special time slot according to a first reporting period in a second time period; if the reported power is lower than the second interference threshold, the first base station is considered as a high interference cell which is interfered by the far end;
step S3, when the number of the high-interference cells accounts for the number proportion of the base stations in the same frequency band of the whole network and exceeds a preset threshold, the network manager reconfigures the frame structure of the base stations in the same frequency band to adopt more GPs, otherwise, the network manager triggers independent optimization of each high-interference base station;
step S4, the network manager determines a second base station set which is within a first preset distance range from the first base station;
step S5, the network manager traverses the second base station set, performs simultaneous downlink loading operation on one or more connected base stations, indicates the loading time length and the downlink loading proportion of the base stations through a network manager interface, and simultaneously indicates the first base station to report the receiving power of each uplink symbol in each special time slot in the time period, resumes the normal state after the base stations are loaded, and selects and replaces the next base station in the set;
step S6, if the interference level of one or more symbols reported by the first base station when loading a certain batch of base stations is higher than a third interference threshold, the network manager considers the batch of scrambling base stations as potential interference sources;
step S7, the network manager instructs the base station to automatically adjust the downward inclination angle of the current interference base station through the network management interface, so that the interference to the first base station is reduced;
step S8, the network manager checks whether the received power in each uplink symbol reported by the first base station is still higher than a first interference threshold after adjustment, if so, the interference elimination is determined to be successful, otherwise, the special time slot configuration of the first base station is changed;
step S9, the first base station configures the connection state terminal to migrate the SRS resource of the connection state terminal to one or more symbols of a certain common uplink subframe from the last symbol or more symbols of a special time slot through RRC signaling, and simultaneously changes the corresponding configuration information of the SRS in the broadcast message;
in the step S8, the configuration of the special slot of the first base station is changed, specifically, the SRS is configured to the last symbol or symbols of the common uplink frame, and the uplink reception in the special slot is turned off.
2. The method of claim 1, wherein the first time period and the first reporting period are configured by a network manager.
3. The method of claim 1, wherein the second interference threshold is lower than the first interference threshold.
4. The method for detecting and optimizing far-end interference according to claim 1, wherein the first preset distance range is a propagation distance over a certain symbol time length configured by a network management system.
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| WO2020165395A1 (en) * | 2019-02-15 | 2020-08-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Technique for mitigating remote interference |
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| US10848294B2 (en) * | 2018-05-02 | 2020-11-24 | Qualcomm Incorporated | Management of remote interference in time division duplexing networks |
| US11310676B2 (en) * | 2019-04-23 | 2022-04-19 | Spectrum Effect Inc. | Methods for mitigating interference and maximizing capacity for time division duplex cellular networks |
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| CN104780550A (en) * | 2014-01-10 | 2015-07-15 | 中国移动通信集团公司 | Interference detection method, base station and interference detection system |
| CN104902505A (en) * | 2014-03-05 | 2015-09-09 | 中国移动通信集团公司 | Method and device for interference detection, and method, device and system for interference elimination |
| CN110971312A (en) * | 2018-09-30 | 2020-04-07 | 中国电信股份有限公司 | Method and device for processing interference between base stations caused by atmospheric waveguide |
| WO2020165395A1 (en) * | 2019-02-15 | 2020-08-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Technique for mitigating remote interference |
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