CN102215505B - A kind of method and system detecting interference source in up going route - Google Patents

Abstract

The invention discloses a method for detecting an uplink interference source, which mainly includes: a serving base station configures interference parameters and interference trigger events for a terminal, and after the terminal detects the power parameters of neighboring base stations, it The event judges whether it has caused uplink interference to the neighbor base station, and reports the interference measurement report to the serving base station when it determines that it is the interference source, and the serving base station sends the interference measurement report and interference control information to the neighbor base station, so that the neighbor base station can know the uplink of the neighbor base station source of interference. The invention also discloses a system for detecting uplink interference sources. The invention provides a solution for detecting uplink interference sources and lays a foundation for effective and rapid interference control processing.

Description

Method and system for detecting uplink interference source

technical field

The invention relates to the field of wireless cellular communication, in particular to a method and system for detecting uplink interference sources.

Background technique

Interference control is an important topic in wireless communication systems. Inter-cell interference will be more prominent in the case of co-frequency deployment of cells, and adjacent-frequency interference also exists between cells in the case of different frequencies. The method of solving interference varies according to the interference. For example, the typical method of dealing with cell edge interference is to use frequency reuse technology. For macro base stations, common interference solving methods and reasonable planning can be used to minimize interference.

With the development of wireless technology, home base stations (H(e)NB, Home(e)NodeB) have been introduced into wireless communication systems. H(e)NB is a small, low-power base station deployed in homes and offices, etc. Indoor places are mainly used to provide users with higher service rates and reduce the cost of using high-rate services, while making up for the lack of coverage of existing distributed cellular wireless communication systems. The advantages of H(e)NB are affordable, convenient, low power output, plug and play, etc. H(e)NB users are connected to the core network network through the home base station access network (H(e)NB AN, Home(e)NodeB Access Network), H(e)NB AN is connected by H(e)NB and home base station gateway (H(e)NB GW, Home(e)NodeB Gateway), where the main functions performed by H(e)NBGW are: verifying the security of H(e)NB, processing H(e)NB registration and Access control, responsible for data exchange between the core network and H(e)NB.

Due to the large number of H(e)NBs, it cannot be completely separated from the macro base station and other adjacent H(e)NBs in terms of frequency, and more H(e)NBs are under the coverage of the macro base station. Therefore, The introduction of H(e)NB increases the complexity of the wireless network, making the interference situation more prominent. The interference here is divided into uplink interference and downlink interference. Wherein, for the case of uplink interference, since the base station considers other received signals as interference except the UE under the serving cell, uplink transmission signals of other cells are also included. In the scenario shown in Figure 1, the uplink interference can include the following situations: the interference of the home terminal (HUE, Home User Equipment) served by the home base station to the macro base station, the interference of the macro terminal (MUE, Macro UE) under the macro base station The interference of the home base station, in addition, the uplink interference may also include the interference of the HUE under the home base station to other home base stations, the interference of the MUE under the macro base station to other macro base stations, and the like.

The current method for solving interference is basically power adjustment or frequency resource division, but the interference source needs to be determined first, and then power control or frequency division can be performed on the interference source. At present, in the interference source detection of uplink interference, the home base station or the macro base station can only determine which cell the interference comes from other macro base stations or the home base station, but cannot determine the interfering terminal.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and system for detecting an uplink interference source, so as to solve the problem in the prior art that an interfering terminal cannot be determined in uplink interference detection.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a method for detecting uplink interference sources. The method includes: a serving base station configures interference parameters and interference trigger events for subordinate terminals; the terminal detects the power parameters of neighboring base stations in real time; To the power parameter of the neighbor base station, the configured interference parameter and its own transmit power, determine whether the interference trigger event is satisfied, if so, determine itself as the interference source, and report the interference measurement report to the serving base station, otherwise , not reporting the interference measurement report.

In the above scheme, the interference parameters configured by the serving base station for subordinate terminals and the interference triggering events are specifically one or more of the following combinations: the interference parameters include the neighbor base station downlink power threshold and the terminal transmit power threshold, the interference The trigger event includes: the downlink power received by the terminal from the neighbor base station is greater than the downlink power threshold of the neighbor base station, and the transmit power of the terminal itself is greater than the terminal transmit power threshold; the interference parameters include the interference signal power threshold from the terminal to the neighbor base station, and the interference The trigger event includes: the interference signal power from the terminal to the neighbor base station is greater than the interference signal power threshold from the terminal to the neighbor base station; the interference parameters include the total interference signal power from the neighbor base station, and the interference ratio threshold from the terminal to the neighbor base station, the interference The triggering event includes: the interference ratio of the terminal to the neighbor base station is greater than the threshold of the interference ratio of the terminal to the neighbor base station.

In the above solution, before the serving base station configures the interference parameter and the interference triggering event for the terminal, the method further includes: the serving base station determines the interference parameter and the interference triggering event through negotiation with the neighbor base station.

In the above solution, the serving base station configures interference parameters and interference triggering events for the terminal, specifically: the serving base station configures interference parameters for the terminal through a configuration message in a radio resource control protocol or through a public broadcast message , and interference trigger events.

In the above solution, the process for the terminal to detect the power parameters of the neighbor base stations is specifically: the terminal receives the message broadcast by the neighbor base station, and detects from the message that it contains the downlink power of the neighbor base station and/or the transmit power of the neighbor base station power parameters.

In the above solution, after the terminal reports the interference measurement report to the serving base station, the method further includes: the serving base station sends an interference control message containing the interference measurement report to the neighbor base station to notify The terminal at the neighbor base station causes interference to the neighbor base station.

In the above solution, the interference measurement report includes any one or more of the following parameters: the physical identifier or cell name of the cell that the terminal interferes with, the cell covered by the neighbor base station, the downlink power of the neighbor base station, the transmit power of the terminal itself, The transmit power of the neighbor base station, and the path loss from the terminal to the neighbor base station.

The present invention also provides a system for detecting uplink interference sources. The system includes: a serving base station and a terminal, wherein: the serving base station is configured to configure interference parameters and interference triggering events for the terminal; the terminal, It is used to detect the power parameters of the neighbor base stations in real time, and determine whether the interference trigger event is satisfied according to the detected power parameters of the neighbor base stations, the interference parameters configured by the serving base station, and its own transmit power, and if so, then Determine itself as an interference source, and report an interference measurement report to the serving base station; otherwise, do not report the interference measurement report to the serving base station.

In the above solution, the serving base station is further configured to: determine the interference parameter and the interference triggering event through negotiation with the neighbor base station.

In the above solution, the serving base station is further configured to: after receiving the interference measurement report reported by the terminal, send an interference control message including the interference measurement report to the neighbor base station.

In the method and system for detecting uplink interference sources provided by the present invention, the serving base station configures interference parameters and interference triggering events for the terminal. After the terminal detects the power parameters of the neighbor base stations, it to judge whether it causes uplink interference to the neighbor base station, and report the interference measurement report to the serving base station, so that the serving base station and the neighbor base station can know the interference source of the uplink interference. The invention provides a solution for detecting the uplink interference source, and lays a foundation for effective and rapid interference control processing.

Description of drawings

FIG. 1 is a schematic diagram of a scenario of interference between a home base station and a macro base station;

FIG. 2 is a schematic diagram of the implementation flow of the method for detecting uplink interference sources of the present invention;

3 is a schematic diagram of the composition and structure of the system for detecting uplink interference sources of the present invention;

4 is an interactive schematic diagram of completing the uplink interference source detection process through the downlink power threshold of the neighbor base station and the transmit power threshold of the terminal;

FIG. 5 is an interactive schematic diagram of completing the uplink interference source detection process through the interference signal power threshold from the terminal to the neighbor base station;

Fig. 6 is an interactive schematic diagram of completing an uplink interference source detection process through an interference ratio.

Detailed ways

The basic idea of the present invention is: the serving base station configures interference parameters and interference triggering events for the subordinate terminals to judge whether interference occurs. If the configured interference trigger event is yes, the terminal determines itself as the interference source, and reports a measurement report to the serving base station, and the serving base station receives the measurement report reported by the terminal, then it can determine that the terminal has generated uplink interference to the neighbor base station, otherwise, If the terminal does not report the measurement report to the serving base station, then the terminal does not generate uplink interference to the neighboring base stations.

A kind of method for detecting uplink interference source of the present invention, with reference to shown in Figure 2, mainly comprises the following steps:

Step 201: The serving base station configures interference parameters and interference triggering events for subordinate terminals;

Step 202: The terminal detects the power parameters of neighboring base stations in real time;

Steps 203-204: The terminal determines whether the interference triggering event is satisfied according to the detected power parameters of the neighboring base stations, its own transmit power, and the configured interference parameters, and if so, proceeds to step 204 to determine that it is interference source, and report an interference measurement report to the serving base station, and end the current detection process; otherwise, do not report the interference measurement report, and directly end the current detection process.

The interference measurement report specifically refers to the relevant measurement report measured when the terminal detects that it is an interference source, and may include radio environment signal information, interfered cell identifier, frequency information, and the like.

Here, the interference measurement report belongs to a dedicated message and may include the identity of the terminal. If the serving base station has already known the identity of the terminal, the interference measurement report may not include the identity of the terminal; , the identifier of the cell covered by the neighbor base station.

Wherein, after the terminal reports the interference measurement report to the serving base station, the method further includes: the serving base station sending an interference control message including the interference measurement report to the neighbor base station to notify the neighbor base station of the The terminal caused interference to neighboring base stations.

Wherein, in the step 201, before the serving base station configures the interference parameters for the terminal and the interference trigger event, the method further includes:

The serving base station determines the interference parameter and the interference triggering event through negotiation with the neighbor base station.

In order to realize the above method, the present invention also provides a system for detecting uplink interference sources. Referring to FIG. 3 , the system includes: a serving base station 31 and a terminal 32, wherein: the serving base station 31 is used for The terminal configures interference parameters and interference trigger events; the terminal 32 is configured to detect the power parameters of neighboring base stations in real time, and based on the detected power parameters of neighboring base stations, the interference parameters configured by the serving base station 31, and its own transmission Power, determine whether the interference trigger event is reached, if yes, determine itself as the interference source, and report the interference measurement report to the serving base station 31, otherwise, do not report the interference measurement report to the serving base station 31.

Wherein, the serving base station 31 may also be configured to: determine the interference parameter and the interference triggering event through negotiation with the neighbor base station.

Wherein, the serving base station 31 may also be configured to: after receiving the interference measurement report reported by the terminal 32, send an interference control message including the interference measurement report to the neighbor base station, so that the neighbor base station can obtain It knows that its own interference source is the terminal 32, so as to perform subsequent interference control processing.

In practical applications, the serving base station 31 may be a home base station or a macro base station, and the neighbor base station may also be a home base station or a macro base station. The terminal may be a mobile device such as a mobile phone in a cell covered by a home base station or a macro base station.

The specific implementation manner of implementing the detection process of the uplink interference source by applying the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

The detection process of the uplink interference source is completed through the downlink power threshold of the neighbor base station and the transmit power threshold of the terminal. Referring to Figure 4, the specific process is as follows:

Step 401: The serving base station of the current cell and the neighbor base station of the neighboring cell determine the interference parameters and the interference trigger event through negotiation;

The determined interference parameters include the neighbor base station downlink power threshold Th1 and the terminal transmit power threshold Th2, and the determined interference trigger event is specifically: when the downlink power received by the terminal from the neighbor base station is greater than Th1 and the terminal's own transmit power is greater than Th2 , the terminal causes interference to neighboring base stations and needs to report an interference measurement report; otherwise, the terminal does not cause interference to neighboring base stations and does not need to report an interference measurement report.

Here, the determination of Th1 and Th2 can be realized by the interaction between the serving base station and the neighbor base station through the ground side process of the X2 port or the S1 port. The specific values of Th1 and Th2 are calculated by the neighbor base station according to its own transmission power and the transmission power of each terminal within its coverage area.

Step 402: The serving base station configures the determined interference parameters and interference trigger events for the terminals in the cell through configuration messages in the Radio Resource Control (RRC, Radio Resource Control) protocol, such as an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message;

Step 403: The terminal receives the message broadcast by the neighbor base station in real time, and detects the power parameter of the neighbor base station from the message, wherein the power parameter of the neighbor base station includes the downlink power Rx_Power of the neighbor base station, and also obtains the terminal's possible power from the message broadcast by the neighbor base station. The physical identification or cell name of the interfering cell covered by the neighboring base station;

Step 404: The terminal judges whether the detected downlink power Rx_Power of the neighboring base station and the transmit power Tx_Power of the terminal itself satisfy the formula (1) according to the interference parameters configured by the serving base station and the interference triggering event, and if so, continue Step 405; otherwise, end the current process;

Rx_Power＞Th1, Tx_Power＞Th2 (1)

Step 405: The terminal determines that it has generated interference to the neighbor base station, and determines that it is the interference source, and reports an interference measurement report to the serving base station;

Wherein, the interference measurement report may include, in addition to the physical identifier or cell name of the cell covered by the neighbor base station that the terminal interferes with, it may also include any one or more of the following parameters: the downlink power Rx_Power of the neighbor base station, the terminal's own transmission Power Tx_Power etc.

Here, the terminal can carry the interference measurement report to the serving base station through any existing signaling in the RRC protocol, or the terminal can define a new signaling for transmitting the interference measurement report in the RRC protocol through negotiation with the serving base station, according to The RRC protocol sends the signaling to the serving base station.

Step 406: The serving base station receives the interference measurement report reported by the terminal, determines that the terminal is the interference source of the neighbor base station, and sends an interference control message to the neighbor base station. Wherein, the interference control message includes the interference measurement report.

Afterwards, the neighboring base station and the serving base station complete subsequent interference control processing through negotiation.

Embodiment two

The detection process of the uplink interference source is completed through the interference signal power threshold from the terminal to the neighbor base station, as shown in Figure 5, and the specific process is as follows:

Step 501: Same as step 401, except that the interference parameter determined here is the threshold Th of the interference signal power from the terminal to the neighbor base station, and the interference trigger event is specifically when the interference signal power from the terminal to the neighbor base station is greater than Th, then the terminal If interference is caused to a neighboring base station, an interference measurement report needs to be reported; otherwise, the terminal does not cause interference to a neighboring base station, and an interference measurement report does not need to be reported.

Here, the interference signal power from the terminal to the neighbor base station specifically refers to the power of the interference signal from the terminal received by the neighbor base station.

Step 502: The serving base station configures the determined interference parameter Th and the interference trigger event for the terminal through a configuration message in the RRC protocol such as an RRC Connection Reconfiguration (RRCConnection Reconfiguration) message or through a public broadcast message such as SIB1 (SystemInformation Block Type1);

Step 503: The terminal receives the message broadcast by the neighbor base station in real time, and detects the power parameter of the neighbor base station from the message, wherein the power parameter of the neighbor base station includes the downlink power Rx_Power of the neighbor base station and the transmit power Tx_N of the neighbor base station, and also from the neighbor base station The physical identification or cell name of the cell covered by the neighboring base station that the terminal may interfere with is obtained from the broadcast message;

Wherein, in the process of determining the interference parameters between the neighbor base station and the serving base station, the neighbor base station sends its own transmit power Tx_N to the serving base station, and then in the process of the serving base station configuring the interference parameters for the terminal, the serving base station then transmits the neighbor base station The transmit power Tx_N of is sent to the terminal.

Step 504: According to the configured interference parameter Th and the interference triggering event, the terminal obtains the interference from the terminal to the neighbor base station according to formula (2) from the detected downlink power Rx_Power of the neighbor base station, the transmit power Tx_N of the neighbor base station, and its own transmit power Tx_Power Signal power Delta, and judge whether obtained Delta is greater than configured Th, if yes, then continue to step 505, otherwise end the current process;

Delta＝Tx_Power-(Tx_N-Rx_Power) (2)

Step 505: Same as step 405, except that the interference measurement report reported by the terminal here may include any of the following parameters in addition to the physical identifier or cell name of the cell covered by the neighboring base station that the terminal interferes with or Multiple: the downlink power Rx_Power of the neighbor base station, the transmit power Tx_Power of the terminal itself, the transmit power Tx_N of the neighbor base station, the path loss from the terminal to the neighbor base station, the physical identification of the neighbor base station, etc.

Wherein, the path loss from the terminal to the neighbor base station is the difference between the transmit power Tx_Power of the terminal itself and the interference signal power Delta from the terminal to the neighbor base station, and is calculated by the terminal.

Step 506: Same as step 406.

Embodiment three

The detection process of the uplink interference source is completed through the interference ratio, as shown in Figure 6, and the specific process is as follows:

Step 601: Same as step 401, the difference is that the interference parameters here include: the total interference signal power No of the neighbor base station, and the interference ratio threshold Pth from the terminal to the neighbor base station; the interference trigger event is specifically the terminal to the neighbor base station If the interference ratio is greater than Pth, the terminal causes interference to neighboring base stations and needs to report an interference measurement report; otherwise, the terminal does not cause interference to neighboring base stations and does not need to report an interference measurement report;

Among them, No is the sum of the power of all interference signals received uplink by the neighbor base station except the signal sent by its own subordinate terminal, including the power of the uplink interference signal sent by the terminal to the neighbor base station, which can be directly notified by the neighbor base station to the serving base station ; Pth is the threshold value of the ratio of the power of the interference signal from the terminal to the neighbor base station to the sum of the powers of all the interference signals received by the neighbor base station.

Step 602: The serving base station configures the determined interference parameter Th and the interference trigger event for the terminal through a configuration message in the RRC protocol such as an RRC Connection Reconfiguration (RRCConnection Reconfiguration) message or through a public broadcast message such as SIB1;

Step 603: The terminal receives the message broadcast by the neighbor base station in real time, and detects the power parameter of the neighbor base station from the message, wherein the power parameter of the neighbor base station includes the downlink power Rx_Power of the neighbor base station and the transmit power Tx_N of the neighbor base station, and also from the neighbor base station The physical identification or cell name of the cell covered by the neighboring base station that the terminal may interfere with is obtained from the broadcast message;

Step 604: According to the configured interference parameters and the interference triggering event, the terminal obtains the terminal according to the formula (2) from the detected downlink power Rx_Power of the neighbor base station, the transmit power Tx_N of the neighbor base station, and its own transmit power Tx_Power. For the interference signal power Delta of the neighbor base station, the interference ratio Pth_U of the terminal to the neighbor base station is obtained according to the obtained Delta according to formula (3), and it is judged whether the obtained Pth_U is greater than Pth, if yes, then continue to step 605, otherwise, end current process;

Pth_U＝Delta/No (3)

Step 605: exactly the same as step 505;

Step 606: exactly the same as step 506.

It should be noted that, in practical applications, any one or more combinations of interference parameters and interference trigger events mentioned in the above three embodiments can be configured in the terminal according to needs, so that the detection process of the uplink interference source Easier to implement.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (12)

1. A method for detecting an uplink interference source, characterized in that the method comprises: The serving base station configures interference parameters and interference triggering events for subordinate terminals; The terminal detects the power parameters of neighboring base stations in real time; The terminal determines whether the interference trigger event is met according to the detected power parameters of the neighbor base stations, the configured interference parameters and its own transmission power, and if so, determines that it is an interference source, and reports an interference measurement report to Otherwise, the serving base station does not report the interference measurement report. 2. The method for detecting uplink interference sources according to claim 1, wherein the serving base station configures interference parameters for subordinate terminals and interference triggering events are specifically one or more of the following combinations: The interference parameter includes a neighbor base station downlink power threshold and a terminal transmit power threshold, and the interference triggering event includes: the downlink power of the neighbor base station received by the terminal is greater than the neighbor base station downlink power threshold, and the terminal's own transmit power is greater than the terminal transmit power threshold; The interference parameter includes an interference signal power threshold from the terminal to the neighbor base station, and the interference triggering event includes: the interference signal power from the terminal to the neighbor base station is greater than the interference signal power threshold from the terminal to the neighbor base station; The interference parameters include the total interference signal power of the neighboring base stations, and the interference ratio threshold from the terminal to the neighboring base stations, and the interference triggering event includes: the interference ratio from the terminal to the neighboring base stations is greater than the interference ratio threshold from the terminal to the neighboring base stations. 3. The method for detecting uplink interference sources according to claim 1, wherein before the serving base station configures interference parameters and interference trigger events for the terminal, the method further comprises: The serving base station determines the interference parameter and the interference triggering event through negotiation with the neighbor base station. 4. The method for detecting uplink interference sources according to any one of claims 1 to 3, wherein the serving base station configures interference parameters and interference triggering events for the terminal, specifically: The serving base station configures interference parameters and interference triggering events for the terminal through a configuration message in a radio resource control protocol or through a public broadcast message. 5. The method for detecting an uplink interference source according to any one of claims 1 to 3, wherein the process of the terminal detecting the power parameters of neighboring base stations is specifically: The terminal receives the message broadcast by the neighbor base station, and detects a power parameter including the downlink power of the neighbor base station and/or the transmit power of the neighbor base station from the message. 6. The method for detecting an uplink interference source according to any one of claims 1 to 3, characterized in that, after the terminal reports an interference measurement report to the serving base station, the method further comprises: The serving base station sends an interference control message including the interference measurement report to the neighbor base station, so as to notify the neighbor base station that the terminal has caused interference to the neighbor base station. 7. The method for detecting an uplink interference source according to claim 4, wherein after the terminal reports an interference measurement report to the serving base station, the method further comprises: The serving base station sends an interference control message including the interference measurement report to the neighbor base station, so as to notify the neighbor base station that the terminal has caused interference to the neighbor base station. 8. The method for detecting an uplink interference source according to claim 5, wherein after the terminal reports an interference measurement report to the serving base station, the method further comprises: The serving base station sends an interference control message including the interference measurement report to the neighbor base station, so as to notify the neighbor base station that the terminal has caused interference to the neighbor base station. 9. The method for detecting uplink interference sources according to claim 6, wherein the interference measurement report includes any one or more of the following parameters: the physical identity or cell of the cell that the terminal interferes with and the cell covered by the neighbor base station name, as well as the downlink power of the neighbor base station, the transmit power of the terminal itself, the transmit power of the neighbor base station, and the path loss from the terminal to the neighbor base station. 10. A system for detecting uplink interference sources, characterized in that the system comprises: a serving base station and a terminal, wherein: The serving base station is configured to configure interference parameters and interference trigger events for the terminal; The terminal is configured to detect a power parameter of a neighbor base station in real time, and determine whether the interference trigger event is satisfied according to the detected power parameter of the neighbor base station, the interference parameter configured by the serving base station, and its own transmit power, If so, determine itself as an interference source, and report an interference measurement report to the serving base station; otherwise, do not report the interference measurement report to the serving base station. 11. The system for detecting an uplink interference source according to claim 10, wherein the serving base station is further configured to: determine the interference parameter and an interference triggering event through negotiation with the neighbor base station. 12. The system for detecting uplink interference sources according to claim 10 or 11, wherein the serving base station is further configured to: after receiving the interference measurement report reported by the terminal, send to the neighbor base station a An interference control message for the interference measurement report.