CN110971440A - Remote interference management method - Google Patents
Remote interference management method Download PDFInfo
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- CN110971440A CN110971440A CN201811331935.2A CN201811331935A CN110971440A CN 110971440 A CN110971440 A CN 110971440A CN 201811331935 A CN201811331935 A CN 201811331935A CN 110971440 A CN110971440 A CN 110971440A
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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 expenditure 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 affected by 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, a downlink signal of an interfering source gnb (aggressor) may propagate over long distances and interfere with an uplink signal of an interfered gnb (victim) far 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 remote Interference comes from the accumulation of multiple remote gNB Interference at different distances, the IoT (Interference over Thermal Noise) in Victim can exhibit a "tilt" characteristic, symbols closer to the guard interval can be subject to accumulated Interference caused by more aggresors, and the Interference power caused by closer aggresors is larger, which results in the "tilt" characteristic of IoT in the time domain.
At present, the NR-RIM scenario is based on the symmetry rule, and the remote interference scenario can be mainly summarized as a symmetric interference scenario and an asymmetric interference scenario. 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 divided into two types, a single reference frame and a double reference frame. 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 of the invention, the dual reference signals are used for accurately detecting whether the remote interference exists, so that the accuracy and the reliability of the detection result are improved. 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 interfering gbb transmits RS signals to the interfered gbb.
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 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.
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 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.
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 simultaneously 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 step 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 interference source gnb (aggressor) may propagate over long distances and interfere with the uplink signal of the interfered gnb (victim) away from it. The reference signal sent by the interfered gNB is RS-1, and RS-1 is used for helping the interference source gNB to identify that the interference source gNB is causing remote interference to the interfered gNB and start RS monitoring.
Step 2: the interferer gbb initiates RS monitoring according to OAM configuration or due to the remote interference being encountered.
Unlike the interfered gNB side directly monitored by the remote trigger RS, the trigger condition of the interference source side 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 (10)
1. A method for remote interference management, the method comprising:
the interfered base station gNB detects remote interference and starts RS monitoring, and transmits a reference signal to the interference source base station 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 interfering source gNB, the interfering source is informed to stop transmitting the RS.
2. The method of claim 1, wherein the notifying an interferer stop transmitting RSs, further comprising:
and the interfered gNB sends RS disappearance information to the interference source through the backhaul link, so that the interference source stops transmitting the RS of the interference source.
3. The method of claim 1, wherein the transmitting the reference signal to the aggressor base station, gbb, further comprises:
the reference signal is used to help the interfering source gNB identify that it is causing remote interference to the interfered gNB.
4. The method of claim 1, wherein the interfered gNB, upon receiving the RS of the interfering gNB, further comprises:
the RS is used to assist the interfered gNB in determining that remote interference exists, and monitoring that several symbols of the uplink resource of the interfered gNB are affected by the interference source gNB.
5. A method for remote interference management, the method comprising:
the interference source is configured by OAM or starts RS monitoring by remote interference;
and after monitoring the interfered source RS, the interference source gNB transmits an RS signal of the interference source gNB.
6. The method of claim 5, wherein the transmitting the self RS signal further comprises:
the interference source gNB transmits an RS signal of the interference source gNB, which is used for assisting the interfered gNB to determine that remote interference exists, and monitoring that several symbols of uplink resources of the interfered gNB are influenced by the interference source gNB.
7. A method for 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;
after monitoring an interfered source RS, an interference source gNB transmits an RS signal of 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 interfering source gNB, the interfering source is informed to stop transmitting the RS.
8. The method of claim 7, wherein the notifying the interferer stop transmitting RSs, further comprising:
and the interfered gNB sends RS disappearance information to the interference source through the backhaul link, so that the interference source stops transmitting the RS of the interference source.
9. The method of claim 7, further comprising:
and the interference source gNB restores the original configuration according to the received RS disappearance information.
10. A mobile communications base station, characterized by carrying out the steps of the method of any one of claims 1 to 4 or carrying out the steps of the method of any one of claims 5 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811141588 | 2018-09-28 | ||
| CN2018111415887 | 2018-09-28 |
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| CN110971440A true CN110971440A (en) | 2020-04-07 |
| CN110971440B CN110971440B (en) | 2023-04-18 |
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| CN201811333441.8A Active CN110971380B (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 |
| CN201811331935.2A Active CN110971440B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method |
| CN201811333334.5A Active CN110971379B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
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| CN201811333447.5A Active CN110971381B (en) | 2018-09-28 | 2018-11-09 | Remote interference management method and network side equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| 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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| Publication number | Publication date |
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| CN110971380B (en) | 2022-06-03 |
| CN110971440B (en) | 2023-04-18 |
| CN110971379A (en) | 2020-04-07 |
| CN110971380A (en) | 2020-04-07 |
| CN110971381B (en) | 2023-01-03 |
| CN110971379B (en) | 2022-10-18 |
| CN110971381A (en) | 2020-04-07 |
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