CN110971440B - Remote interference management method - Google Patents
Remote interference management method Download PDFInfo
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- CN110971440B CN110971440B CN201811331935.2A CN201811331935A CN110971440B CN 110971440 B CN110971440 B CN 110971440B CN 201811331935 A CN201811331935 A CN 201811331935A CN 110971440 B CN110971440 B CN 110971440B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
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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 application discloses a remote interference management method, which can be used for accurately detecting whether remote interference exists or not by using double reference signals in an initial state, so that the accuracy and the reliability of a detection result are improved. Meanwhile, after receiving the corresponding remote interference reference signal, the interfered gNB stops transmitting the remote interference reference signal per se, thereby avoiding the situation that double reference signals are transmitted simultaneously to a certain extent, greatly reducing the communication resource consumption for remote interference suppression and reducing the expense of an RIM frame.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method for constructing a remote interference management framework.
Background
Under certain weather conditions, electromagnetic waves propagating in the atmosphere, and in particular in the troposphere, are subject to atmospheric refraction and their propagation trajectory will bend to the ground. Wherein part of the electromagnetic wave is trapped in a thin atmosphere with a certain thickness, and propagates in a similar way to the electromagnetic wave in a metal waveguide. This phenomenon is known as the propagation of electromagnetic waves through atmospheric waveguides (also known as tropospheric waveguides).
Atmospheric waveguiding causes signals transmitted by the gNB to propagate hundreds of kilometers away with little path loss, thereby causing interference to the remote gNB. In TD-LTE, the wireless signals of synchronized remote enbs with the same TDD configuration may cause non-negligible interference, i.e. remote interference, to the local eNB due to the presence of the atmospheric waveguide phenomenon. Despite many differences between 5G NR and TD-LTE, most deployments of NR are also in TDD mode, and hence NR still faces the problem of remote interference.
In particular, in the presence of the atmospheric waveguiding phenomenon, the downlink signal of the interfering source gNB (aggregator) can propagate over long distances and interfere with the uplink signal of the interfered gNB (Victim) away from it. And the farther the agressor is away from the Victim, the larger the time delay is, and the more symbols are interfered on the uplink of the Victim. Since the generation of the remote Interference comes from the accumulation of the remote gNB Interference at a plurality of different distances, the IoT (Interference over Thermal Noise) in Victim may exhibit a "tilt" characteristic, the symbols closer to the guard interval may be subjected to the accumulated Interference caused by the aggregate Interference more, and the Interference power caused by the aggregate more, which causes the IoT to have a "tilt" characteristic in the time domain.
At present, an NR-RIM scene is based on a symmetry rule, and a remote interference scene can be mainly summarized into a symmetric interference scene and an asymmetric interference scene. The symmetric interference scenario mainly refers to the phenomenon of atmospheric waveguide, in which IoT is symmetrically increased at two gnbs causing remote interference with each other, and this situation is often caused by the network topology of the system, and is relatively easy to occur point-to-point or cluster-to-cluster with the same density. While asymmetric interference mainly refers to the asymmetric increase of IoT at two gnbs causing remote interference with each other if atmospheric waveguiding phenomenon occurs, which occurs because some gnbs suffer more remote interference caused by gnbs due to a specific network topology or different density of gnbs in different areas.
The research on the remote interference management framework mainly focuses on the mechanism of the gNB to initiate/terminate transmission/monitoring of reference signals. The framework is responsible for defining the functions, requirements and transmission mechanisms of the corresponding reference signals, so as to analyze and design the reference signals correspondingly. In general, the remote interference management framework mainly needs to perform the following functions: discovering remote interference; monitoring an interference source generating interference; informing an interference source to implement an interference suppression scheme; monitoring an interference disappearance time point; the original configuration is restored.
The current proposals of various companies mainly achieve the following consensus: discovering remote interference using IoT, and determining that remote interference occurs when IoT exceeds a certain threshold; the reference signal is adopted to monitor the interference source, the interfered party sends the reference signal, and the interference party can receive the reference signal and is regarded as the interference source. The main differences are as follows: whether the interference source returns a reference signal to assist in monitoring remote interference disappearance; whether to transmit signals using a backhaul link.
The current R16 NR RIM framework can be largely classified into a single reference signal framework and a dual reference signal framework. For the reference signal RIM framework, the reference signal "disappearance" sent by the interfered party is mostly monitored by the interference source gNB for remote interference disappearance, which is based on the monitoring of the reference signal "disappearance" sent by the interfered party by the interference source gNB, and the real remote interference channel condition (i.e. from the interference source gNB to the interfered gNB) cannot be reflected, which may bring wrong judgment in the channel environment of asymmetric interference, resulting in deviation in interference adjustment.
For the dual-reference-signal RIM frame, the reference signals from the interference source gNB to the interfered gNB can effectively determine whether remote interference exists, but two reference signals in the remote interference suppression structure occupy corresponding communication resources at the same time, which greatly increases the overhead of the RIM frame.
Disclosure of Invention
The invention provides a scheme for constructing a new remote interference management framework. Different from the RIM framework, the invention can reduce the interaction of the reference signals in the framework flow on the premise of using the double reference signals, thereby reducing the expenditure of system resources.
In the initial state, the invention accurately detects whether the remote interference exists or not by using the double reference signals, thereby improving the accuracy and the reliability of the detection result. Meanwhile, after receiving the corresponding remote interference reference signal, the interfered gNB stops transmitting the remote interference reference signal of the interfered gNB, thereby avoiding the situation that double reference signals are transmitted simultaneously to a certain extent, greatly reducing the consumption of communication resources for remote interference suppression and reducing the expenditure of an RIM framework. When the remote interference suppression scheme is adopted, the decision of the scheme is made according to a reference signal sent by the interference source gNB to the interfered gNB, and the decision is executed at the interference source end, so that the detection result has higher reliability. In addition, the invention also adopts a return link to inform the interference source to stop the reference signal transmission, and the original configuration is recovered, thereby improving the transmission efficiency and accuracy. In general, the RIM framework provided by the invention reduces the load of reference signal transmission as much as possible while completing the required functions, reduces the overhead of communication resources, and improves the accuracy of signal detection and transmission.
A method of remote interference management, the method comprising:
the interfered gNB detects remote interference and starts RS monitoring, and transmits a reference signal to the interference source gNB;
after receiving the RS of the interference source gNB, the interfered gNB stops transmitting the RS of the interfered gNB;
when the interfered gNB cannot detect the RS from the interference source gNB, the original configuration of the interfered gNB is restored.
Further: and the interfered gNB sends RS disappearance information to the interference source through the backhaul link.
A method of remote interference management, the method comprising:
the interference source is configured by OAM or starts RS monitoring by remote interference;
the interference source gNB transmits an RS signal to the interfered gNB.
Further: and the interference source gNB restores the original configuration according to the received disappearance information.
A method of remote interference management, the method comprising:
the interfered gNB detects remote interference and starts RS monitoring, and transmits a reference signal to the interference source gNB;
the interference source is configured by OAM or starts RS monitoring by remote interference;
an interference source gNB transmits an RS signal to an interfered gNB;
after receiving the RS of the interference source gNB, the interfered gNB stops transmitting the RS per se;
when the interfered gNB cannot detect the RS from the interference source gNB, the original configuration of the interfered gNB is restored.
Further: and the interfered gNB sends RS disappearance information to the interference source through the backhaul link.
Further: and the interference source gNB restores the original configuration according to the received disappearance information.
In general, the RIM framework provided by the invention reduces the burden of reference signal transmission as much as possible while completing the required functions, reduces the overhead of communication resources, and improves the accuracy of signal detection and transmission.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a diagram of a remote interference management framework according to the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a remote interference management framework according to the present invention, and in step 0, an interference source gNB (aggregator) generates remote interference to an interfered gNB (Victim). Step 1, the interfered gNB detects remote interference and starts RS monitoring, and transmits a reference signal to the interference source gNB. And 2, configuring the interference source by OAM or starting RS monitoring under remote interference. And step 3, the interference source gNB transmits RS signals to the interfered gNB. And step 4, after receiving the RS of the interference source gNB, the interfered gNB stops transmitting the RS of the interfered gNB and starts to adopt a remote interference suppression scheme. And 5, when the interfered gNB cannot detect the RS from the interference source gNB, restoring the original configuration of the interfered gNB, and sending the RS disappearance information to the interference source through the backhaul link. And 6, restoring the original configuration by the interference source gNB according to the received disappearance information.
The embodiment of the invention provides a novel RIM scheme, namely a remote interference management scheme based on double reference signals and backhaul link transmission, which comprises the following steps:
step 1: when the interfered gNB detects remote interference, RS transmission and monitoring are triggered;
in the case of an atmospheric waveguide, the downlink signal of the interfering source gNB (Aggressor) may propagate over long distances and interfere with the uplink signal of the interfered gNB (Victim) away from it. The reference signals transmitted by the interfered gNB are RS-1 and RS-1 at this time, which are used to help the interference source gNB to identify that they are causing remote interference to the interfered gNB and start RS monitoring.
And 2, step: the interference source gNB initiates RS monitoring either according to OAM configuration or due to the encounter of remote interference.
Unlike the interfered gNB terminal directly monitored by the remote trigger RS, the trigger condition of the interference source terminal RS monitoring mechanism comprises remote interference trigger and OAM configuration trigger.
And step 3: after monitoring RS-1, the interference source gNB sends an RS to inform the interfered gNB that remote interference still exists.
The reference signal sent by the interference source gNB is RS-2, which is used to assist the interfered gNB in determining whether remote interference still exists and monitoring/inferring that several symbols of the uplink resource of the interfered gNB are affected by the interference source gNB.
And 4, step 4: the interfered gNB stops RS-1 transmission when receiving RS-2 and starts a remote interference suppression scheme.
After receiving RS-2, the interfered gNB takes the condition as the condition that RS-1 stops transmitting, and does not continue to transmit RS-1 in the subsequent interference suppression. Meanwhile, at the interfered gNB end, an interference suppression scheme is adopted according to the RS-2 measurement report, such as abandoning transmission of some uplink symbols, improving the power of the interfered uplink symbols and the like. The scheme can be flexibly adjusted according to the scheme of remote interference suppression.
And 5: and when the interfered gNB no longer monitors the RS-2, determining that the remote interference disappears, and simultaneously recovering the original configuration of the interference source gNB and the interfered gNB.
Here, no RS-2 signal is monitored as a determination condition for interference disappearance, and the interfered gNB notifies the interference source to restore the original configuration through the backhaul link.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (7)
1. A method for remote interference management, the method comprising:
the method comprises the steps that an interfered base station gNB detects remote interference and starts RS monitoring, reference signals RS-1 are transmitted to an interference source base station gNB, the RS-1 are used for the interference source gNB to recognize that the interference source gNB is causing remote interference on the interfered gNB, and after the interference source gNB monitors the RS-1, reference signals RS-2 are sent to assist the interfered gNB to determine whether the remote interference still exists and conclude that a plurality of symbols of uplink resources of the interfered gNB are influenced by the interference source gNB;
after receiving the RS of the interference source gNB, the interfered gNB stops transmitting the RS of the interfered gNB, starts remote interference suppression, and does not continue to transmit RS-1 in the interference suppression;
when the interfered gNB does not detect the RS from the interfering source gNB, the interfering source gNB is notified to stop transmitting the RS.
2. The method of claim 1, wherein the notifying an interferer gNB to stop transmitting RSs, further comprising:
and the interfered gNB sends RS disappearance information to the interference source gNB through the backhaul link, so that the interference source gNB stops transmitting own RS.
3. A method for remote interference management, the method comprising:
an interference source base station gNB starts RS monitoring by OAM configuration;
after monitoring the RS of the interfered base station gNB, the interference source gNB transmits own RS signals for assisting the interfered gNB to determine whether remote interference still exists and deducing that a plurality of symbols of uplink resources of the interfered gNB are influenced by the interference source gNB, after receiving the RS of the interference source gNB, the interfered gNB stops transmitting own RS and starts remote interference suppression, and does not continue to transmit RS-1 in the interference suppression, wherein the RS-1 is used for the interference source gNB to identify that the interference source gNB is causing remote interference on the interfered gNB;
the interfering gNB stops transmitting the RS upon receiving a notification from the interfering gNB when the interfered gNB does not detect the RS from the interfering gNB.
4. A method for remote interference management, the method comprising:
the interference base station gNB detects remote interference and starts RS monitoring, and transmits a reference signal RS-1 to the interference source base station gNB, wherein the RS-1 is used for the interference source gNB to identify that the interference source gNB is causing remote interference to the interference base station gNB;
the interference source gNB is subjected to RS monitoring by OAM configuration;
after monitoring the RS of the interfered source gNB, the interference source gNB transmits an RS signal of the interference source gNB, and the RS signal is used for assisting the interfered gNB to determine whether remote interference still exists and deducing that a plurality of symbols of uplink resources of the interfered gNB are influenced by the interference source gNB;
after receiving the RS of the interference source gNB, the interfered gNB stops transmitting the RS of the interfered gNB, starts remote interference suppression, and does not continue to transmit RS-1 in the interference suppression;
when the interfered gNB does not detect the RS from the interfering source gNB, the interfering source gNB is notified to stop transmitting the RS.
5. The method of claim 4, wherein the notifying the interferer gNB to stop transmitting RSs, further comprising:
and the interfered gNB sends RS disappearance information to the interference source gNB through the backhaul link, so that the interference source gNB stops transmitting own RS.
6. The method of claim 4, further comprising:
and the interference source gNB restores the original configuration according to the received RS disappearance information.
7. A mobile communications base station, characterised by performing the steps of the method of any of claims 1~2 or by performing the steps of the method of claim 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2018111415887 | 2018-09-28 | ||
| CN201811141588 | 2018-09-28 |
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| CN110971440A CN110971440A (en) | 2020-04-07 |
| CN110971440B true CN110971440B (en) | 2023-04-18 |
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| CN201811333334.5A Active CN110971379B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
| CN201811333447.5A Active CN110971381B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
| CN201811333441.8A Active CN110971380B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
| CN201811331935.2A Active CN110971440B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method |
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| CN201811333447.5A Active CN110971381B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
| CN201811333441.8A Active CN110971380B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
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| CN110809278B (en) * | 2018-08-06 | 2021-10-22 | 中国移动通信有限公司研究院 | Signal transmission method and device |
| CN114363795A (en) * | 2020-09-27 | 2022-04-15 | 中国移动通信有限公司研究院 | Method, apparatus, device and medium for locating far-end interference |
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| CN104969643A (en) * | 2013-04-25 | 2015-10-07 | 华为技术有限公司 | Interference suppression method, related device, and system |
| CN108289311A (en) * | 2017-01-09 | 2018-07-17 | 中兴通讯股份有限公司 | Interference detecting method and device and timing offset measurement method |
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| CN102595436B (en) * | 2011-01-13 | 2015-05-27 | 华为技术有限公司 | Method, device and system for detecting interference |
| US8737925B2 (en) * | 2011-03-10 | 2014-05-27 | Comtech Ef Data Corp. | Method for the control of a wireless communications link for mitigating adjacent satellite interference |
| JP5690019B2 (en) * | 2011-04-08 | 2015-03-25 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Reducing interference caused by atmospheric ducts in wireless communication systems |
| CN103095631A (en) * | 2011-11-03 | 2013-05-08 | 中兴通讯股份有限公司 | Transmission method, allocation method and device of downlink reference signal |
| WO2015022388A1 (en) * | 2013-08-16 | 2015-02-19 | Nokia Solutions And Networks Oy | Method and apparatus for transmitting interference reference signals to assist channel quality measurements |
| CN105025519B (en) * | 2014-04-30 | 2019-06-14 | 电信科学技术研究院 | Interference signal measurement method and relevant device |
| CN105828349B (en) * | 2015-01-04 | 2019-04-23 | 中国移动通信集团公司 | A kind of far-end interference detection method and device based on TD-LTE system |
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| CN104969643A (en) * | 2013-04-25 | 2015-10-07 | 华为技术有限公司 | Interference suppression method, related device, and system |
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| CN110971440A (en) | 2020-04-07 |
| CN110971380A (en) | 2020-04-07 |
| CN110971379B (en) | 2022-10-18 |
| CN110971381B (en) | 2023-01-03 |
| CN110971381A (en) | 2020-04-07 |
| CN110971379A (en) | 2020-04-07 |
| CN110971380B (en) | 2022-06-03 |
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