WO2011050687A1

WO2011050687A1 - Method for avoiding signal interference in hierarchical network and base station thereof

Info

Publication number: WO2011050687A1
Application number: PCT/CN2010/077938
Authority: WO
Inventors: 赵锐; 秦飞; 张�杰; 孙韶辉; 朱亚军; 潘学明
Original assignee: 电信科学技术研究院
Priority date: 2009-10-30
Filing date: 2010-10-21
Publication date: 2011-05-05
Also published as: CN102014504A; CN102014504B

Abstract

Disclosed are a method and a base station(BS) for avoiding signal interference in a hierarchical network, wherein the method includes: a first BS obtains the location information, relative to the first BS, about a user equipment(UE) belonging to the first BS and a second BS; the first BS obtains the time-frequency resource information about the second BS; the first BS schedules the time-frequency resources used for signal transmission to the UE and to the second BS according to the time-frequency resource information and the location information about the second BS and the location information about the UE; according to the location information about the UE and the second BS, the first BS, using beamforming, respectively transmits signals to the UE and to the second BS on the time-frequency resources of the UE and the second BS. The present invention achieves avoiding interference by the means of combining beamforming and time-frequency resource scheduling, thus being able to further make use of the space domain to avoid interference.

Description

Method for avoiding signal interference in a layered network and base station The present application claims to be submitted to the Chinese Patent Office on October 29, 2009, application number 200910236829.0, and the invention name is "a method station for avoiding signal interference in a layered network" The priority of the Chinese patent application is hereby incorporated by reference in its entirety.

The present invention relates to mobile communication technologies, and in particular, to a method and a base station for avoiding signal interference in a layered network. Background technique

In mobile communication networks, with the increasing demand for data rate and coverage, the traditional method of providing access by macro base stations has been unable to meet the requirements. Use cell splitting, and deploy some low-power base stations (such as Home/Pico/Femto/Relay, home base station/picocell base station/femtocell base station/relay base station) in hotspots or indoors. Solve this problem. This low-power base station is a base station device used in a home indoor environment, an office environment, or other small coverage environment, enabling operators to provide attractive services with higher data rates and lower cost.

Figure 1 is a schematic diagram of a hierarchical networking. The Home eNB (Home Evolved Base Station) is used as an example. In order to distinguish the difference, the UE to which the base station belongs is identified as MUE (Marc UE), and the Home eNB is identified as HeNB. The associated UE is identified as HUE (Home UE), and the basic structure of the hierarchical networking is as shown in Figure 1. As can be seen from the hierarchical network structure above, there are two main types of interference in the layered network from the propagation direction:

Downlink interference downlink: That is to say, when the Marco UE and the Home UE (home user equipment) are received, the downlink interference from the Marco eNB (macro-evolved base station) and the Home eNB is always received.

Uplink interference uplink: that is, when the Marco eNB and Home eNB receive it, it will always be subject to Up to interference from Marco UE and Home UE.

The existing methods for interference avoidance mainly avoid interference avoidance or interference reduction from the perspective of time-frequency resource division and power control. The main schemes are as follows:

1. Avoid interference by static/semi-static FDM (Frequency Division Multiplexing):

As shown in Figure 2, in the static/semi-static FDM interference avoidance frequency diagram, by assigning different time-frequency resources to the Marco eNB (shown as MeNB in the figure) and the Home eNB (shown as HeNB in the figure), the Marco eNB and The UEs in the HeNB occupy different time-frequency resources, thereby avoiding interference.

The advantage of this scheme is that it is simple to implement, but its disadvantage is: Resource utilization is relatively low.

2. Reduce interference by power control:

By obtaining the corresponding uplink/lower interference information by the interaction between the Marco eNB and the HeNB, or the measurement of the radio link, the reflected power of the Marco eNB or the HeNB is adjusted by the power control method to mitigate the downlink interference, and Adjust the transmit power of the UE to reduce uplink interference.

The advantage of this approach is that it is versatile, but the downside is that it is a passive method of interference mitigation and does not guarantee performance.

3. FDM+ power configuration mode:

As shown in FIG. 3, in the frequency avoidance and interference mitigation frequency diagram of the FDM+ power configuration, downlink interference is implemented by configuring different time-frequency resources and transmission power levels on different time-frequency resources for the Marco eNB and the HeNB. Avoid or reduce.

This approach is an improved approach to static/semi-static FDM, but the disadvantage is that the resource utilization of FDM itself is still relatively low.

4. Dynamic FDM+ICIC (Inter-Cell Interference Coordinate):

Through the interaction between the Marco eNB and the HeNB, or the measurement of the radio link, the interference status of other cells on each time-frequency resource is known, and the interference is reduced by scheduling and power control. Light or avoid.

This approach is an improved approach to static/semi-static FDM, but the disadvantages are: no further use of airspace to avoid interference, while the performance of interference mitigation or avoidance is limited by the delay of signaling interactions in the ICIC process. And the period of measurement. Summary of the invention

The technical problem solved by the present invention is to provide a method and base station for avoiding signal interference in a layered network.

In the embodiment of the present invention, a method for avoiding signal interference in a layered network is provided, which includes the following steps:

The first base station acquires location information of the user equipment UE and the second base station relative to the first base station, where the UE is a UE that belongs to the first base station;

The first base station acquires time-frequency resource information of the second base station;

The first base station schedules time-frequency resources used when transmitting signals to the UE and the second base station according to the time-frequency resource information of the second base station and the location information of the UE and the second base station;

The first base station uses a beamforming to transmit signals to the UE and the second base station on the time-frequency resources of the UE and the second base station, respectively, according to the location information of the UE and the second base station.

A base station is provided in the embodiment of the present invention, including:

a location acquisition module, configured to acquire location information of the UE and other base stations in the layered network with respect to the base station, where the UE is a UE that belongs to the base station;

The time-frequency frequency is obtained for acquiring time-frequency resource information of other base stations in the hierarchical network; the resource scheduling module is configured to use time-frequency resource information and location information of other base stations in the hierarchical network, and the UE The time-frequency resource used by the location information scheduling to transmit signals to the UE and other base stations in the layered network;

a sending module, configured to perform beamforming on the time-frequency resources of the UE and other base stations in the layered network according to the location information of the UE and other base stations in the layered network, respectively, to send signals to the UE and other base stations in the layered network. . The beneficial effects of the present invention are as follows:

In the implementation of the present invention, in consideration of the fact that the relative position of the base station is relatively fixed, when the spatial domain interference is avoided based on the base station direction information, not only the location information of the subordinate UE and other base stations but also the time-frequency resource information of other base stations are acquired; And, according to the time-frequency resource information and the location information of the other base station, and the location information of the UE, scheduling time-frequency resources used when transmitting signals to the UE and other base stations; and simultaneously adopting beamforming according to location information of the UE and other base stations. The signals are transmitted to the UE and other base stations on the time-frequency resources of the UE and other base stations respectively, so that interference avoidance is achieved by combining beamforming and time-frequency resource scheduling, and the airspace can be further used to avoid interference. DRAWINGS

1 is a schematic diagram of hierarchical networking in the background art;

2 is a schematic diagram of interference avoidance frequencies of static/semi-static FDM in the background art;

3 is a schematic diagram of frequency interference avoidance and interference mitigation in an FDM+ power configuration in the background art; FIG. 4 is a schematic flowchart of a method for avoiding signal interference in a tiered network according to an embodiment of the present invention; FIG. Avoid the schematic diagram of the scheme;

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. detailed description

The technical solution adopted by the prior art mainly provides a solution for interference avoidance and interference mitigation from the perspective of time-frequency resources and power control. Considering that the base station in the future always adopts the technology of multiple antennas, the technical solution provided by the embodiment of the present invention is adopted. Airspace to avoid interference. Obviously, this scheme is a scheme that can effectively enhance the interference avoidance effect. Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 4, in the schematic flowchart of the method for avoiding signal interference in the layered network, the following steps may be included in avoiding signal interference:

Step 401: The first base station acquires location information of the UE and the second base station with respect to the first base station, where the UE is a UE that belongs to the first base station; Step 402: The first base station acquires time-frequency resource information of the second base station.

Step 403: The first base station schedules time-frequency resources used when transmitting signals to the UE and the second base station according to the time-frequency resource information of the second base station and the location information of the UE and the second base station.

Step 404: The first base station sends a signal to the UE and the second base station on the time-frequency resources of the UE and the second base station according to the location information of the UE and the second base station.

In the implementation, there is no necessary timing requirement in step 401 and step 402. Step 401 may be performed first, and step 402 may be performed. Step 402 may be performed first, step 401 may be performed; step 401 and step 402 may be performed simultaneously.

In step 402, the statistics of the uplink/downlink time-frequency resource occupation or the interference status of the uplink/downlink time-frequency resources can be simultaneously transmitted to other cells through the inter-cell interaction. During scheduling, users in each cell allocate interference by assigning different time-frequency resources. In the LTE (Long Term Evolution), the inter-cell ICIC (Inter-Cell Interference Coordinate) related information is mainly transmitted through the X2 interface, and the inter-cell load is given in 3GPP TS 36.423. The interactive description of the information, which mainly contains the information shown in the following table.

IE/Group Name Prese Range IE type Semantics Critica Assigned nce and description lity Criticalit reference

Message Type M 9.2.13 YES ignore

Cell Information M YES ignore

> Cell 1 to EACH ignore

Information maxC

Item elline

NB

»Cell ID M ECGI Id of the

9.2. source cell

14

»UL O 9.2.17 ― ― Interference

Overload

Indication

> >UL High 0 to

Interference maxC

Information elline

NB

»>Target Cell M ECGI Id of the

ID 9.2. cell for

14 which the

HII is

Me

»>UL High M 9.2.18

Interference

Indication

» Relative O 9.2.19

Narrowband Tx

Power (RNTP) The beamforming technique adopted in step 404 is that the base station introduces different weighting values on each physical antenna at the origin according to the channel information fed back by the terminal or the channel information estimated by the base station, so that the base station transmits to each user. The signals can be concentrated in a narrow beam range. On the one hand, the user's received signal-to-noise ratio can be enhanced. On the other hand, since the transmitted energy is concentrated in a narrower one-angle angle, the interference to other users in this direction is also reduced. When the receiving end performs demodulation, considering different weighting processing on the physical antenna as part of the channel change, the user-specific reference symbol that is also shaped may be used to estimate the equivalent fading channel experienced by the user (including the actual Channel fading and the effects of weighted shaping).

The principle of the technical solution provided by the present invention is not limited to the interference avoidance between the macro base station and the low power base station, and can also be applied between the macro base station and the macro base station, and the low power base station and the low base station. Interference avoidance between power base stations, between macro base stations and low power base stations. The following is a description of the implementation of the first base station as the macro base station and the second base station as the low power base station.

Figure 5 is a schematic diagram of the airspace interference avoidance scheme. For convenience of description, FIG. 5 assumes that the time-frequency resource of the Marco eNB is f, the time-frequency resource of Home eNB 1 (shown as HeNB1 ) is fl , and the time-frequency resource of Home eNB 2 (shown as HeNB 2 ) is £ 2 . The time-frequency resource fl of the Home eNB 1 and the time-frequency resource Ω of the Home eNB 2 may be the same or different. The f-fl indicates other time-frequency resources that do not include the FL time-frequency resource, and the f- 2 indicates that it is not. Other time-frequency resources including time-frequency resources.

In the implementation, the Marco eNB schedules the Marco UE by using beamforming and time-frequency resource scheduling in accordance with the location information of the Marco UE and the HeNB relative to the Marco eNB and the time-frequency resource occupancy of the HeNB, thereby avoiding interference. In the figure, the MUE (Marc UE) refers to the UE that belongs to the Marco eNB, and the HUE (Home UE) refers to the UE that belongs to the HeNB.

In implementation, the location information includes directions and coverage so that a range of directions can be determined based on the location information. That is, the location information may include one or a combination of the following information:

Geographic coordinates, coverage, direction angle, channel information, PMI (Precooding matrix indicator).

Specifically, the location information can be:

1), geographic coordinates and / or coverage; 2), direction angle and / or coverage; 3), channel information, etc. For example, the estimation of the angle of arrival and the implementation of the direction information may be performed according to the channel information. When the first base station acquires the location information of the second base station relative to the first base station, the method may include:

Obtain location information by operating maintenance configuration; or, obtain location information by interacting with the second base station through the S1 or X2 interface; or obtain location information by air interface measurement.

Specifically, the location information or the location-related information can be obtained by calculating the parameters of the location information, which can be obtained through the network side or by the air interface measurement method, and the manner can be divided into the following:

1) , through operation and maintenance configuration: Its location information can be geographical coordinates and / or coverage. 2), interacting through the SI or X2 interface: the location information may be any one of the above three types of location information, where for the relay, the signaling interaction between the base stations is always performed through the wireless channel, and the information is through the air interface. Channel transmission.

3), air interface measurement: The location information can be direction angle and / or coverage or channel information.

4) In the implementation, when the second base station is a Relay base station, the location information may be obtained according to the arrival angle estimation after the relay uplink signal is measured; or, the downlink channel information carrying the direction information may be measured and/or Or PMI to obtain location information, such as through broadband P.

Specifically, for the relay base station, the methods can be divided into the following types:

a), its location information macro base station can use the angle of arrival estimation method to obtain the relay uplink signal measurement, and if the uplink signal strength exceeds a certain strength, it needs to consider the direction interference avoidance,

b), measuring downlink channel information, etc., directly feeding back channel information; or by feedback, feeding back a PML carrying angle information

It can be seen from the above description that the Marco eNB needs to know the location information of the HeNB relative to the Marco eNB. The direction information can be obtained through the signaling interaction between the Marco eNB and the HeNB. The specific direction information may be the angle information of the HeNB relative to the Marco eNB. Or the geographic location information of the HeNB, so that the Marco eNB can obtain the direction information of the current HeNB through calculation. At the same time, for a low-power base station with wireless channel interaction, it can measure its angle of arrival by the uplink signal or feed back another information parameter that can be obtained through calculation. For example: PMI information, or channel information carrying direction information.

In an implementation, when the first base station acquires time-frequency resource information of the second base station, the method may include: acquiring, by using network configuration information, time-frequency resource information of the second base station;

Or, the time-frequency resource information of the second base station is obtained by using an S1 or X2 interface interaction.

Specifically, when the time-frequency resource information of the second base station is obtained through the interaction of the S1 or the X2 interface, the RNTP (relative Narrowband Tx power indicator) may be used. The indication of the power indication) and/or the DL-HII (DL-High Interference Indicator) is used to acquire the time-frequency resource information of the second base station.

In the dynamic case, in the time-frequency resource information of the second base station obtained by the indication mode of the DL-HII, the meanings of the DL-HII and the UL-ffll (UL-High Interference Indicator) are consistent. Both indicate frequency resources in the current base station that require interference coordination/avoidance.

Specifically, the Marco eNB needs to know the current spectrum occupancy of each HeNB, and the learned manner can be as follows:

Static / semi-static allocation of spectrum, or the network configuration information is obtained by ₀ X2 or S1 interface interaction

The dynamic frequency division, through the RNTP indication information of the HeNB, knows the occupancy of the current HeNB's time-frequency resources. For a low-power base station such as a HeNB, the macro base station can obtain its frequency information through the network side, which may be an S1 or X2 interface interaction, where for the relay, the signaling interaction between the base stations always passes through the wireless channel. The information is transmitted through the air interface channel.

In the implementation, when the first base station acquires the location information and the time-frequency resource information of the second base station, the method may include:

The second base station is determined according to the coverage plan pre-configuration;

Or the second base station is a base station that reports location information and time-frequency resource information, and the base station measures the RSRP (Reference Signal Received Power) strength of the RS (reference signal) signal of the first base station. At the threshold, the location information and the time-frequency resource information are reported.

Specifically, the determining manner of the set of target base stations that the location information and the frequency occupation information need to transmit may include:

1) The method for determining the operation and maintenance configuration range is to cover the pre-configured neighboring base stations.

2) The low power base station determines the macro base station set whose RSRP strength of the macro base station RS signal exceeds a certain range by measuring the macro base station signal strength (RSRP), and transmits the location information to the macro base station in the corresponding macro base station set. The information interaction of reporting location information is initiated by the low power base station. In an implementation, when the first base station acquires location information of the Marco UE relative to the first base station, the method may include:

The position information is obtained by measuring the angle of arrival of the Marco UE by the uplink signal; or, the location information is obtained by the P information fed back by the Marco UE and/or the channel information carrying the direction information.

Specifically, the Marco eNB needs to know the direction information of the Marco UE relative to the Marco eNB, and can mainly measure the angle of arrival through the uplink signal, and feed back another information parameter that can be obtained through calculation through the UE. For example: PMI information, channel information carrying direction information, and the like.

Through the above implementation, the Marco eNB already knows the direction information of the relevant HeNB and the related time-frequency resources occupied by the respective HeNBs. The Marco eNB determines the direction of the beam according to the direction information of the Marco UE, and the Marco eNB schedules the downlink time-frequency resources occupied by the Marco UE according to the direction information of the relevant HeNB and the time-frequency resources occupied by the respective HeNBs. If the Marco UE is located in the vicinity or in the direction of the HeNB, the Marco eNB needs to prevent the Marco UE from occupying the same time-frequency resources (such as MUE2 and MUE3 in FIG. 5) by scheduling, if the Marco UE is away from the HeNB or in the direction of the HeNB. Then, the Marco eNB can schedule the Marco UE to multiplex the downlink time-frequency resources of the current HeNB (such as MUE1 in FIG. 5). That is, when the first base station determines that the Marco UE is located in the direction of the second base station, the method may include:

When the first base station sends a signal to the Marco UE and the second base station, different time-frequency resources are used; or, the transmission power used by the first base station to transmit signals to the Marco UE is low;

Or, reducing the modulation coding level used when the first base station transmits a signal to the Marco UE.

Specifically in the implementation can be:

1) The Marco eNB needs to know the direction information of the power base station relative to the Marco eNB and the time-frequency resource occupancy of the HeNB through the network side or air interface measurement method.

2) The Marco eNB determines the time-frequency resources and the direction of the beam (or the right of the shaping) scheduled by the Marco UE according to the direction information of the Marco UE relative to the Marco eNB and the a priori information in 1) (ie, the information obtained in 1). value). In general, the beam direction transmitted by the Marco eNB always points to the direction of the Marco UE as much as possible. among them:

A) If the Marco UE is located in the direction of the low power base station, the interference is mitigated or avoided. The formula can also be: 3⁄4 mouth:

(1), by scheduling the time-frequency resources of the Marco UE to avoid using the same time-frequency resources as the low-power base station;

(2), can use more power by means of power control;

(3), a lower modulation coding level can be used to ensure the reliability of the wireless link.

B) If the Marco UE is located outside the direction of the low power base station, its time-frequency resource can use the same time-frequency resource as the low-power base station.

The following is an example to illustrate.

Embodiment 1:

In this embodiment, a low-power base station for a home of the HeNB type will be described as an example. This embodiment describes a manner in which the HeNB actively transmits information, that is, the second base station acquired by the first base station is a base station that reports location information and time-frequency resource information, and the base station detects that the RSRP strength of the RS signal of the first base station exceeds the limit. When the value is, the top 4 position information and the time frequency resource information. The specific implementation can be as follows:

1) The HeNB can learn the current channel information by measuring the RS signal of the current Marco eNB.

2) The HeNB may measure the macro base station set whose macro base station RSRP signal strength exceeds a certain range according to the RSRP strength of the RS signals of all the base stations that are currently measured, and the HeNB needs to actively initiate a report for the current macro base station set, and report the HeNB itself. Location information, coverage information, and frequency occupancy information. The content of the specific information is as described in the above technical solution, and details are not described herein again.

Embodiment 2:

This embodiment will be described by taking a low-power base station with air interface interaction such as Relay as an example. This embodiment describes the manner in which the Marco eNB acquires the location information and the time-frequency resource information, that is, when the first base station acquires the location information of the second base station relative to the first base station, the location information is obtained through the air interface measurement. Specific implementations may include:

1) The Marco eNB can measure its angle of arrival according to the uplink wireless signal of the current relay.

2), the Marco eNB to which the Rela belongs can obtain the relay for the interaction of the air interface signaling. Information on coverage and time-frequency resource occupancy.

3), other Marco eNBs can obtain information about the location information, coverage, and time-frequency resource occupancy of the relay by interacting with the Marco eNB to which the relay belongs.

Embodiment 3:

This example is described by taking an example of a Pico-based low-power base station deployed by an operator. This embodiment describes the manner in which the Marco eNB acquires the location information and the time-frequency resource information, that is, when the first base station acquires the location information of the second base station relative to the first base station, the location information is obtained by operating the maintenance configuration. Specific implementations may include:

1), Marco eNB can obtain the geographical location information and coverage information of Pico through the operation and maintenance center.

2) The operation and maintenance center can send Pico's geographical location information and coverage information and time-frequency resource occupancy information to the base station (neighboring base station) that needs to avoid interference according to the network planning.

Based on the same inventive concept, a base station is further provided in the embodiment of the present invention. The principle of the problem solved by the base station is similar to the method for avoiding signal interference in a layered network. Therefore, the implementation of the base station can be implemented by referring to the method. It will not be repeated here.

As shown in FIG. 6, the base station of the embodiment of the present invention may include:

The location obtaining module 601 is configured to acquire location information of the UE and other base stations in the layered network with respect to the base station, where the UE is a UE that belongs to the base station;

The time-frequency acquisition module 602 is configured to acquire time-frequency resource information of other base stations in the layered network, and the resource scheduling module 603 is configured to: time-frequency resource information and location information of other base stations in the layered network, and location of the UE Time-frequency resources used by the information scheduling to transmit signals to the UE and other base stations in the hierarchical network;

The sending module 604 is configured to send a signal according to other base stations that use the wave according to location information of the UE and other base stations in the layered network.

In implementation, the location obtaining module 601 can be further used to obtain other bases in the hierarchical network. 10 077938 The location information of the station relative to the base station is obtained by operating the maintenance configuration; or, the location information is obtained by interacting with other base stations in the layered network through the S1 or X2 interface; or, obtaining the location by air interface measurement information.

In an implementation, the location obtaining module 601 may be further configured to: when the other base station in the layered network is a Relay base station, obtain the location information according to the angle of arrival estimation by measuring the relay uplink signal; or, by measuring the downlink carrying the direction information. The location information module and the PMI are used to obtain the location information. The location obtaining module 601 may be further configured to: when acquiring the location information of the UE relative to the local base station, measure the arrival angle of the UE by using the uplink signal to obtain the location information; or, The UI information fed back by the UE and/or the channel information carrying the direction information acquires location information.

In an implementation, the location obtaining module 601 may be further configured to obtain one or a combination of the following information: geographic coordinates, coverage, direction angle, location information of channel information, ΡΜΙ.

In an implementation, the time-frequency acquisition module 602 may be further configured to acquire time-frequency resource information of the second base station by using network configuration information when acquiring time-frequency resource information of other base stations in the layered network; or, by using S1 or Χ2 The interface interacts to obtain time-frequency resource information of the second base station.

In a specific implementation, the time-frequency acquisition module 602 may be further configured to obtain, by using an RNTP and/or an indication of a downlink high-interference indication DL-HII, when acquiring time-frequency resource information of the second base station by using an S1 or Χ2 interface interaction. Time-frequency resource information of the two base stations.

In an implementation, the time-frequency acquisition module 602 may be further configured to: when acquiring location information and time-frequency resource information of other base stations in the layered network, obtaining other base stations in the hierarchical network according to the coverage planning pre-configuration; or The other base station in the obtained hierarchical network is a base station that reports location information and time-frequency resource information. When detecting that the RSRP strength of the RS signal of the base station exceeds the alarm value, the base station reports the location information and the time-frequency resource information.

In an implementation, the sending module 604 may be further configured to: use different time-frequency resources when transmitting signals to the UE and other base stations in the layered network when determining that the UE is located in a direction of other base stations in the layered network; or, reduce Transmit power used when transmitting signals to the UE; or, reducing the modulation coding level used when transmitting signals to the UE; determining, in the first base station, the direction of the UE and the second base station When the first base station sends a signal to the UE and the second base station, different time-frequency resources are used; or when the first base station sends a signal to the UE and the second base station, the same time-frequency resource is used.

For convenience of description, the various parts of the above described devices are divided into various modules or units by function. Of course, the functions of the various modules or units may be implemented in one or more software or hardware in the practice of the invention.

It can be seen from the foregoing embodiments that, in the technical solution provided by the present invention, the direction information of other base stations in the layered network relative to the Marco eNB and the time-frequency resource information of the base station are obtained by means of network side or air interface interaction. The interference avoidance is performed by the combination of beamforming and time-frequency resource scheduling, so that the interference of the airspace can be further utilized.

The technical solution provided by the present invention provides a method for avoiding airspace interference based on base station direction information, and also avoids interference avoidance based on FDM, in the case of interference avoidance based on airspace, considering that the relative position of the base station is relatively fixed. Effective enhancement of the method.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowcharts and/or block diagrams, and combinations of flow and/or blocks in the flowcharts and/or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the computer readable memory is stored in the computer readable memory. The instructions in the production result include an article of manufacture of an instruction device that implements the functions specified in a block or blocks of a flow or a flow and/or a block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A method for avoiding signal interference in a layered network, characterized in that it comprises the following steps:

The first base station acquires location information of the user equipment UE and the second base station relative to the first base station, and time-frequency resource information of the second base station, where the UE is a UE that belongs to the first base station;

The first base station sends a signal to the UE and the second base station on the time-frequency resources of the UE and the second base station by using beamforming according to the location information of the UE and the second base station.

2. The method according to claim 1, wherein the acquiring, by the first base station, the location information of the second base station relative to the first base station comprises:

Obtain location information through operation and maintenance configuration;

Or, the location information is obtained by interacting with the second base station through the S1 or X2 interface;

Or, obtain position information through air interface measurement.

The method according to claim 1 or 2, wherein the second base station is a relay relay base station;

The acquiring, by the first base station, the location information of the second base station relative to the first base station, includes: obtaining, by using the uplink uplink signal, the location information according to the angle of arrival estimation; or, by measuring the downlink channel information that carries the direction information, / or precoding matrix information PMI to obtain location information.

The method of claim 1, wherein the acquiring, by the first base station, the location information of the second base station relative to the first base station comprises:

Obtaining location information by measuring an arrival angle of the UE by using an uplink signal;

Or, the location information is obtained through the PMI information fed back by the UE and/or the channel information carrying the direction information.

The method according to any one of claims 1 to 4, wherein the location information comprises One or a combination of the following information: geographic coordinates, coverage, direction angle, channel information,

PML

The method according to claim 1, wherein the acquiring, by the first base station, the time-frequency resource information of the second base station includes:

Obtaining time-frequency resource information of the second base station by using network configuration information;

Or, the time-frequency resource information of the second base station is obtained through the S1 or X2 interface.

The method according to claim 6, wherein if the time-frequency resource information of the second base station is acquired through the S1 or X2 interface interaction, the indication of the DL-HII is obtained by the RNTP and/or the downlink high interference indication. Time-frequency resource information of the two base stations.

8. The method according to claim 1, wherein the second base station is determined according to a coverage plan pre-configuration;

Or the second base station is a base station that reports the location information and the time-frequency resource information, and the base station reports the location information and the time-frequency resource information when the reference signal received power RSRP strength of the reference signal RS of the first base station exceeds a threshold. .

The method according to any one of claims 1 to 4, wherein the first base station determines that the UE is located in the direction of the second base station, and includes:

When the first base station sends a signal to the UE and the second base station, different time-frequency resources are used; or, the transmit power used by the first base station to transmit signals to the UE is reduced.

Or, reducing the modulation coding level used when the first base station transmits a signal to the UE.

The method according to any one of claims 1 to 4, or 6 to 8, wherein, when the first base station determines that the direction of the UE and the second base station are different, the method includes:

When the first base station sends a signal to the UE and the second base station, different time-frequency resources are used; or when the first base station sends a signal to the UE and the second base station, the same time-frequency resource is used.

A base station for avoiding signal interference in a layered network, comprising: a location acquisition module, configured to acquire location information of a UE and other base stations in a layered network relative to the base station, where the UE belongs to UE of the base station;

a time-frequency acquisition module, configured to acquire time-frequency resource information of other base stations in the layered network; a resource scheduling module, configured to schedule time-frequency resources used when transmitting signals to the UE and other base stations in the hierarchical network according to time-frequency resource information and location information of other base stations in the layered network, and location information of the UE;

a sending module, configured to perform beamforming on the time-frequency resources of the UE and other base stations in the layered network according to the location information of the UE and other base stations in the layered network, respectively, to send signals to the UE and other base stations in the layered network. .

The base station according to claim 11, wherein the location acquiring module is specifically configured to:

Obtaining location information by operating maintenance configuration when acquiring location information of other base stations in the layered network relative to the base station; or acquiring location information by interacting with other base stations in the layered network through the S1 or X2 interface; or The position information is obtained through air interface measurement.

The base station according to claim 11 or 12, wherein the location acquiring module is specifically configured to:

When the other base station in the layered network is the Relay base station, the location information is obtained according to the angle of arrival estimation by measuring the relay uplink signal; or, the location information is obtained by measuring the downlink channel information and/or PMI carrying the direction information. .

When acquiring the location information of the UE relative to the local base station, the location information is obtained by measuring the arrival angle of the UE by using the uplink signal; or acquiring the location information by using the PMI information fed back by the UE and/or the channel information carrying the direction information.

The base station according to any one of claims 11 to 14, wherein the location acquisition module is specifically configured to:

Get one or the combination of the following information: geographic coordinates, coverage, direction angle, location information for channel information, PMI.

The base station according to claim 11, wherein the time-frequency acquisition module is specifically configured to: Obtaining the time-frequency resource information of the second base station by using the network side configuration information when obtaining the time-frequency resource information of the other base stations in the layered network; or acquiring the time-frequency resource information of the second base station by using the S1 or X2 interface interaction .

The base station according to claim 10, wherein the time-frequency acquisition module is specifically configured to:

When the time-frequency resource information of the second base station is obtained through the S1 or X2 interface interaction, the time-frequency resource information of the second base station is obtained by the indication of the R TP and/or the downlink high-interference indication DL-HII.

The base station according to claim 11, wherein the time-frequency acquisition module is specifically configured to:

When acquiring location information and time-frequency resource information of other base stations in the layered network, the other base stations in the obtained hierarchical network are determined according to the coverage plan pre-configuration; or, the other base stations in the acquired hierarchical network are reported. The base station of the location information and the time-frequency resource information, when the base station detects that the RSRP strength of the RS of the base station exceeds a threshold, reports the location information and the time-frequency resource information.

The base station according to any one of claims 11 to 14, 16 to 18, wherein the sending module is specifically configured to:

When determining that the UE is located in the direction of other base stations in the hierarchical network, when transmitting signals to the UE and other base stations in the hierarchical network, different time-frequency resources are used; or, the transmission power used when transmitting signals to the UE is reduced. Or, the modulation coding level used when transmitting the signal to the UE is reduced; when the first base station determines that the direction of the UE is different from the second base station, when the first base station sends a signal to the UE and the second base station, different time-frequency resources are used; Or, when the first base station sends a signal to the UE and the second base station, the same time-frequency resource is used.