WO2013044804A1

WO2013044804A1 - Method and device for co-channel interference coordination

Info

Publication number: WO2013044804A1
Application number: PCT/CN2012/082057
Authority: WO
Inventors: 苗婷; 李岩; 刘星; 王斌; 周栋
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-09-30
Filing date: 2012-09-26
Publication date: 2013-04-04
Also published as: CN103037377A; CN103037377B

Abstract

A method and a device for co-channel interference coordination. The method comprises: receiving a co-channel interference coordination request sent by an interfered base station; acquiring interference coordination parameter information of the interfered base station and of a co-channel base station and of an adjacent-channel base station thereof, wherein the frequency spectrum used by said co-channel base station is the same as or overlaps the interfered frequency spectrum, and the frequency spectrum used by said adjacent-channel base station is adjacent to the interfered frequency spectrum; and performing interference coordination for the interfered base station and the co-channel base station according to the interference coordination parameters. The method and device can adjust power of a co-channel base station based on acquired information, thereby reducing co-channel interference between cells.

Description

Co-channel interference coordination method and device

Technical field

The present invention relates to the field of wireless communications, and in particular, to a co-channel interference coordination method and apparatus. Background technique

In wireless communication systems, wireless spectrum resources are an indispensable and extremely limited resource. The fixed allocation and dynamic use of the spectrum may result in a large amount of spectrum not being fully utilized, and ensuring that it does not interfere with authorized users. Cognitive radio technology can improve the utilization of spectrum, and efficiently and flexibly use the spectrum that is not used by the main system (authorization system) in a certain time and space area. The cognitive communication wireless communication equipment can follow some kind of "opportunistic". The way to use other system licensed frequency bands, of course, this must be established in the case that the licensed frequency band is idle or the licensed frequency band has only a small number of services being communicated, which greatly improves the utilization of spectrum resources and solves the growing demand for wireless communication services. Contradictions with increasingly scarce spectrum resources. In the current research of cognitive radio technology, the secondary system (perceptual radio system) can obtain the available spectrum resource information of the primary system through access to the authorized service database, and the secondary system acquires the spectrum resource and allocates it to the base station, due to the requested spectrum resource. Limited, there may be cases where multiple base stations use the same spectrum, and co-channel interference between cells will occur.

Nowadays, land mobile communication cellular systems use frequency reuse, which increases the capacity of the system to a certain extent and improves the spectrum utilization, but also increases the degree of interference of the system, and the larger the same frequency reuse coefficient. The more serious the interference, the direct impact on the quality of the user's call, and even the call drop or the inability to establish a normal call.

At present, the LTE system mainly suppresses randomization and interference cancellation for the same-frequency interference. The interference randomization method mainly includes cell-specific scrambling and cell-specific interleaving. The method is simple and feasible, but the performance is not good; the interference cancellation can be significantly improved. The system characteristics at the edge of the cell obtain higher spectral efficiency, but are not suitable for services with smaller bandwidth, and the complexity of the receiver and the synchronization between cells are also required;

Therefore, how to effectively reduce the co-channel interference between cells is a problem that must be considered in the field of wireless communications. Summary of the invention

The technical problem to be solved by the present invention is to provide a co-channel interference coordination method and device to solve the problem of large inter-frequency interference in a small interval.

To solve the above technical problem, the present invention provides a co-channel interference coordination method, which includes:

Receiving a co-channel interference coordination request sent by the interfered base station;

Obtaining interference coordination parameter information of the interfered base station, the same-frequency base station, and the adjacent-frequency base station, where the spectrum used by the same-frequency base station of the interfered base station is the same as or overlaps with the interfered frequency, the interfered base station The spectrum used by the adjacent frequency base station is adjacent to the interfered spectrum;

Performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter. Preferably, the step of acquiring the interference coordination parameter information of the interfered base station, the same-frequency base station, and the adjacent-frequency base station includes:

Determining, by the co-channel interference coordination request, an intra-frequency base station of the interfered base station and an adjacent-frequency base station of the interfered base station;

And transmitting an interference coordination parameter information request to the interfered base station, the same-frequency base station of the interfered base station, and an adjacent-frequency base station of the interfered base station;

The interfered base station, the same-frequency base station of the interfered base station, and the adjacent-frequency base station of the interfered base station feed back interference coordination parameter information.

Preferably, the co-frequency interference coordination request carries a central frequency point and a bandwidth of the interfered spectrum of the interfered base station, and determines the interfered base station according to the central frequency point and bandwidth in the co-channel interference coordination request. The same frequency base station and the adjacent frequency base station of the interfered base station.

Preferably, the triggering event that the interfered base station sends the co-channel interference coordination request is for the same interfered spectrum, and the percentage of the terminal that is subjected to the same-frequency interference greater than the preset interference-intensity threshold is compared with the terminal that reports the measurement result. The number of terminals that exceed a certain preset value or whose strength of the same-frequency interference is greater than the interference strength threshold exceeds a certain preset value.

Preferably, the interference coordination parameter information of the interfered base station and its co-frequency base station includes information of a current base station for determining a power allocation weight of an intra-frequency base station, and a position of a reference point in the current base station, The minimum value of the maximum interference level that can be accepted at each point in the current coverage area of the base station, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current base station's current transmit power. The interference coordination parameter information of the adjacent base station of the interfered base station includes a path loss between the adjacent frequency base station and a reference point in the same frequency base station, an antenna pattern of the adjacent frequency base station, and adjacent frequency interference suppression. (ACIR);

The reference point in the base station refers to a point where the same-frequency base station of the base station has the strongest interference in the coverage area of the base station.

Preferably, the information used by the current base station to determine the power allocation weight of the same frequency base station includes the priority of the current base station serving user, the number of users corresponding to each priority, and/or the load status of the base station.

Preferably, the step of performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter comprises:

And allocating power weights to the interfered base station and the same-frequency base station according to the information used to determine the power allocation weight of the same-frequency base station;

The maximum transmit power of the interfered base station and its co-frequency base station when the downlink interference is acceptable according to the power weight assignment result, the other interference coordination parameter information, and the current transmit power upper limit value of the interfered base station and the same-frequency base station ;

The victim base station and its co-frequency base station are notified to adjust the transmit power to be less than or equal to the maximum transmit power.

To solve the above technical problem, the present invention also provides a co-channel interference coordination device, the device comprising:

The interference coordination request receiving unit is configured to: receive the co-channel interference coordination request sent by the interfered base station; and the interference coordination parameter information acquiring unit is configured to: acquire interference of the interfered base station, the same-frequency base station, and the adjacent-frequency base station Coordinating the parameter information, wherein the spectrum used by the same-frequency base station of the interfered base station is the same as or overlaps with the interfered spectrum, and the spectrum used by the adjacent-frequency base station of the interfered base station is adjacent to the interfered frequency;

An interference coordination unit, configured to: the interfered base station according to the interference coordination parameter and The same frequency base station performs interference coordination.

Preferably, the interference coordination parameter information acquiring unit includes:

And a neighboring frequency base station determining module, configured to: determine, according to the co-frequency interference coordination request, an intra-frequency base station of the interfered base station and an adjacent-frequency base station of the interfered base station;

The information sending module is configured to: send an interference coordination parameter information request to the interfered base station, the same-frequency base station of the interfered base station, and an adjacent-frequency base station of the interfered base station;

The information receiving module is configured to: receive the interference coordination parameter information fed back by the interfered base station, the same-frequency base station of the interfered base station, and the adjacent-frequency base station of the interfered base station.

Preferably, the interference coordination parameter information of the interfered base station and its co-frequency base station includes information of a current base station for determining a power allocation weight of an intra-frequency base station, a position of a reference point in a current base station, and points in a current base station coverage area. The minimum value of the maximum interference level acceptable, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current base station's current transmit power;

The interference coordination parameter information of the adjacent base station of the interfered base station includes a path loss between the adjacent base station and a reference point in the same-frequency base station, an antenna pattern of the adjacent-frequency base station, and adjacent-channel interference suppression ( ACIR ) ;

The reference point in the base station refers to a point where the same-frequency base station of the base station has the strongest interference in the coverage area of the base station;

The information used by the current base station to determine the allocation weight of the same-frequency base station includes the priority of the current base station serving user, the number of users corresponding to each priority, and/or the load status of the base station.

Preferably, the interference coordination unit comprises:

The power weight allocation module is configured to: allocate power weights to the interfered base station and its same-frequency base station according to the information used to determine the power allocation weight of the same-frequency base station;

The maximum transmit power calculation module is configured to: set, according to the power weight assignment result, other interference coordination parameter information, and the current transmit power upper limit value of the interfered base station and the same-frequency base station, that the downlink interference is acceptable, the interfered base station And the maximum transmit power of the same frequency base station;

The power adjustment notification module is configured to: notify the interfered base station and its co-frequency base station to adjust the transmit power to be less than or equal to the maximum transmit power. To solve the above technical problem, the present invention also provides a co-channel interference coordination device, the device comprising:

Memory, set to: store instructions;

a processor, configured to: coupled to the memory, the processor configured to execute instructions stored in the memory, wherein the processor is configured to:

Performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter. Preferably, the interference coordination parameter information of the interfered base station and its co-frequency base station includes information of a current base station for determining a power allocation weight of an intra-frequency base station, a position of a reference point in a current base station, and points in a current base station coverage area. The minimum value of the maximum interference level acceptable, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current base station's current transmit power;

Based on the method and apparatus of the embodiments of the present invention, the power of the same-frequency base station can be adjusted based on the acquired information, thereby reducing co-channel interference between cells.

BRIEF abstract 1 is a schematic diagram of a co-channel interference coordination method according to an embodiment of the present invention;

2 is a schematic diagram of an application scenario according to an embodiment of the present invention;

Figure 3 is a schematic diagram of downlink interference between cells;

Figure 4 is a schematic diagram of reference point selection;

FIG. 5 is a signaling flowchart of an application example 1 of the same-frequency interference coordination information method;

6 is a flowchart of determining a base station weight according to a priority of a service user of a base station and a number of users corresponding to each priority, and implementing power control;

7 is a flow chart for determining base station weights and implementing power control according to the load status of the base station; FIG. 8 is a flow chart for determining power according to the priority of the service users of the base station, the number of users corresponding to each priority, and the load status of the base station, and implementing power control. Figure

FIG. 9 is a schematic structural diagram of a module of a co-channel interference coordination apparatus according to an embodiment of the present invention. Preferred embodiment of the invention

Power control is a key technology in wireless communication systems that improves spectrum utilization and reduces power consumption. The power of the transmitter will affect the quality of the link signal and the interference environment of the wireless system. The effective power control of the base station can be performed as much as possible while maintaining the quality of the link call, which can reduce the downlink interference caused by the base station to the user terminal. If the system knows the relevant parameter information for power control, it can effectively control the downlink co-channel interference between cells. In view of this, the embodiment of the present invention provides a co-channel interference coordination method for a downlink interference problem generated when different base stations use the same spectrum. As shown in FIG. 1, the method includes:

Step 101: Receive a co-channel interference coordination request sent by the interfered base station.

Preferably, before the central control node receives the co-frequency interference coordination request of the subordinate base station 1, the method further includes: performing interference measurement by the base station 1 together with the subordinate terminal, and determining, according to the measurement result, whether to send the co-channel interference coordination request to the central control node;

Step 102: Obtain interference coordination parameter information of the interfered base station, its co-frequency base station, and an adjacent-frequency base station, where the spectrum used by the same-frequency base station of the interfered base station is the same as or overlaps with the interfered spectrum. The spectrum used by the adjacent base station of the interfering base station is adjacent to the interfered frequency; The obtaining the interference coordination parameter information of the interfered base station, the same-frequency base station, and the adjacent-frequency base station includes:

Specifically, the co-frequency interference coordination request carries a central frequency point and a bandwidth of the interfered spectrum of the interfered base station, and determines the interfered base station according to the central frequency point and bandwidth in the co-frequency interference coordination request. The same frequency base station and the adjacent frequency base station of the interfered base station.

Step 103: Perform interference coordination on the interfered base station and its same-frequency base station according to the interference coordination parameter.

The interference coordination parameter information of the same-frequency base station includes information used by the current base station to determine the power allocation weight of the same-frequency base station, the position of the reference point in the current base station, and the minimum value of the maximum interference level acceptable at each point in the coverage area of the current base station. The path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current transmit power of the current base station;

The interference coordination parameter information of the adjacent frequency base station includes a path loss between the adjacent frequency base station and a reference point in the same frequency base station, an antenna pattern of the adjacent frequency base station, and adjacent channel interference suppression (ACIR); The information for determining the power allocation weight of the same-frequency base station includes, but is not limited to, the priority of the service user subordinate to the base station, the number of users corresponding to each priority, and/or the load status of the base station;

The priority of the user refers to the user level selected by the user when the user opens the account, or the user level determined according to the user's consumption behavior and/or the user's QoS (Quality of Service) requirement;

The load status refers to a load level determined by the base station according to current radio resource status (Radio Resource Status) and/or integrated cell available capacity (Available Capacity) information;

The location of the reference point, the minimum value of the maximum interference level acceptable at each point in the coverage area of the base station, The method for determining the path loss includes but is not limited to road test, simulation, and system warm-up;

The method for the center control node to perform interference coordination is that the central control node performs power control on the same frequency base station.

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

An application scenario corresponding to the invention is shown in Figure 2. The main network element involved has a central control node.

(CCP, Central control point) and base station.

The central control node is mainly responsible for coordinating the allocation of the primary system idle spectrum resources to the subordinate base stations according to the primary system idle spectrum resource application proposed by the subordinate base station; the primary system idle spectrum resources refer to the spectrum resources used by the unlicensed system.

The central control node may interact with other central control nodes to use the primary system idle spectrum resource usage information to avoid interference; the central control node may also perform power control on the subordinate base stations according to the interference coordination information provided by the subordinate base stations to implement inter-cell communication. Interference coordination.

The central control node stores spectrum usage information of the subordinate base station.

The corresponding inter-cell downlink interference model of the invention is shown in FIG. 3. The information received by the user 2 by the base station 2 is interfered by the signal sent by the base station 1 to the user 1 at the same frequency in the adjacent cell, and for the user 1, It is also subject to co-channel interference from base station 2. When both users are at the junction of the cells to which the base stations 1 and 2 belong, the useful signal and the interference signal received by the user are equal, and the interference will be very serious, and the communication quality of the user will also drop drastically.

FIG. 4 shows a schematic diagram of reference point selection in the invention, and FIG. 4 shows a reference point (black point in the figure) of the same-frequency base station 2, 3 of the base station 1 when the base station 1 is the working base station, the base station 2 The reference point in the working base station 1 is the most interfered point in the coverage area of the working base station 1. The reference point of the base station 3 in the working base station 1 is that the base station 3 has the strongest interference in the coverage area of the working base station 1. point. The reference point in the base station 1 is a collective term for the reference point in the base station 1 and the reference point of the base station 3 in the base station 1. Similarly, the reference point of the base station 1, 3 in the working base station 2 and the reference point of the base station 1, 2 in the working base station 3 can be determined.

After receiving the co-frequency interference coordination request of the subordinate base station 1, the central control node requests the same-frequency base station and the adjacent-frequency base station of the base station 1 to report the interference coordination parameter information; the central control node uses the reported interference coordination parameter information to its subordinate base station 1 and its subordinate base station 1 The same frequency base station performs interference coordination. Embodiments of the invention will be described in detail below. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The following description is made by taking the same-frequency interference between three base stations as an example. It can be understood that the scenario in which the present invention is applied is not limited to the networking form of three intra-frequency base stations.

Application example 1

As shown in FIG. 5, the implementation process of the interference coordination information method application example 1 includes the following steps: Step 501: The base station 1 performs interference measurement together with the subordinate terminal, and determines, according to the measurement result, whether to send the co-channel interference coordination request to the central control node;

The interference measurement here is mainly that the base station and the terminal measure the strength of the same-frequency interference; the trigger condition of the interference measurement may be that the communication quality of the terminal cannot meet the requirement, or a new neighbor base station is started;

The measurement result includes: a center frequency point and a bandwidth of the interfered spectrum, and the strength of the same frequency interference; the base station determines whether to send the same frequency interference coordination request to the central control node, for example, for the same interfered spectrum, The percentage of the terminal that is stronger than the preset interference strength threshold than the terminal that reports the measurement result exceeds a certain preset value, such as 90%. Or the number of terminals that are stronger than the interference strength threshold by the same frequency interference exceeds a certain preset value, for example, 20.

The interference intensity threshold and the preset value are set according to simulation, or communication quality requirements of the service. Step 502: The base station 1 sends a co-channel interference coordination request to the CCP;

The co-channel interference coordination request includes a center frequency and a bandwidth of the interfered spectrum.

Step 503: After receiving the request of the base station 1, the CCP determines the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the subordinate base station;

Specifically, the CCP determines an intra-frequency base station of the interfered base station and an adjacent-frequency base station of the interfered base station according to a center frequency point and a bandwidth in the co-channel interference coordination request.

Preferably, the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the CCP's subordinate base station may be base stations adjacent to the base station 1 of the CCP.

Further, the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the subordinate base station of the CCP are also It may be a base station adjacent to the base station 1 of the CCP and a base station not adjacent to the base station 1 by the CCP. The same-frequency base station of the base station 1 refers to a base station whose used spectrum is the same as or overlaps with the interference frequency of the terminal of the base station 1; the adjacent-frequency base station of the base station 1 refers to a spectrum that is adjacent to the interfered frequency of the terminal of the base station 1 Base station.

Steps 504a-504b: The CCP sends a co-frequency interference coordination parameter information request to the base station 1, and the base station 1 feeds back the CCP co-channel interference coordination parameter information;

Here, the message carried by the co-frequency interference coordination parameter information request includes the same-frequency base station identifier of the subordinate base station of the CCP and its coverage;

Here, the co-channel interference coordination parameter information includes a service user priority, a number of users corresponding to each priority, and/or a load status of the base station, a reference point position in the base station, and a minimum value of the maximum interference level acceptable at each point in the coverage area of the base station, The path loss between the same-frequency base station of the base station and the reference point, the antenna pattern of the base station, and the upper limit value of the current transmit power of the base station;

In 504b, after receiving the request of the same-frequency interference coordination parameter information of the CCP, the base station 1 acquires the data of the relevant parameter according to the same-frequency interference coordination parameter configuration, and sends the data to the CCP;

The method for obtaining the data of each parameter is as follows:

The priority of the service user can be selected at the time of user opening, or determined according to the user's consumption behavior and/or the user's QoS requirements;

The reference point in the base station is the point where the same-frequency base station of the base station has the strongest interference in the coverage area of the base station, and the position of the reference point can be determined by means of road test, simulation, system warm-up, and the like;

The minimum value of the maximum interference level acceptable to each point in the coverage area of the base station, the same-frequency base station of the base station, and steps 505a-505b: The CCP sends the same-frequency interference coordination parameter information request to the same-frequency base station of the base station 1, and the same-frequency base station feedback of the base station 1 CCP co-channel interference coordination parameter information;

Here, the co-channel interference coordination parameter information request and the content synchronization of the co-channel interference coordination parameter information are synchronized. Steps 504a-504b.

Steps 506a-506b: The CCP sends a neighboring frequency interference coordination parameter information request to the neighboring frequency base station of the base station 1, and the adjacent frequency base station of the base station 1 feeds back the CCP adjacent frequency interference coordination parameter information;

Here, the information carried by the adjacent-frequency interference coordination parameter information request includes a central frequency point and a bandwidth of the interfered spectrum, and a reference point in each of the same-frequency base stations;

Here, the adjacent frequency interference coordination parameter information includes path loss between the adjacent frequency base station of the base station 1 and all reference points in the base station 1 and its co-frequency base station, the antenna pattern of the base station, and adjacent channel interference suppression (ACIR).

As mentioned before, the reference point in a base station refers to the point at which the base station's co-frequency base station has the strongest interference in the base station. For example, there are two co-frequency base stations BS1 and BS2, the reference point of BS1 in BS2 is i ₂₁ , and the reference point of BS2 in BS1 is i ₁₂ , then "all reference points in the same-frequency base station" refers to BS1 i ₂₁ in i ₁₂ and BS 2

506b, the neighboring base station of the base station 1 receives the CCP's adjacent-frequency interference coordination parameter information request, and according to the adjacent-frequency interference coordination parameter configuration, acquires the data of the relevant parameter and sends it to the CCP;

The method for obtaining the data of each parameter is as follows:

The path loss between the adjacent base station of the base station 1 and all reference points of the base station 1 and its same-frequency base station can be determined by means of road test, simulation, system warm-up, and the like;

The adjacent channel interference suppression (ACIR) can be calculated from the indicators of the transmitter and receiver according to the center frequency and bandwidth of the interfered spectrum, or can be determined by road test, simulation, system warm-up, etc. Step 507: CCP pair Base station 1 and its co-frequency base station perform interference coordination;

The method for performing interference coordination by the CCP is: first, assigning weights to the base station 1 and its co-frequency base station power according to the priority of the service user in the co-channel interference coordination parameter, the number of users corresponding to each priority, and/or the load status of the base station; The adjacent channel interference coordination parameter, other co-channel interference coordination parameters, the weight of the base station 1 and its co-frequency base station, and the upper limit value of the current transmit power when the base station 1 and its co-frequency base station use the same-stage interfered spectrum To ensure that the downlink interference generated by the base station 1 and its co-frequency base station is acceptable, calculate the maximum transmit power of the base station 1 and its co-frequency base station; finally, the CCP informs the base station 1 and its co-frequency base station to adjust the working transmit power to less than or equal to Maximum transmit power.

The interference strength is calculated based on the interference coordination parameters. Generally, the performance requirements of different terminals are not much different, and it can be considered that it is independent of the terminal. Acceptable interference levels are measurable Large transmission power will be mentioned.

Application example 2

FIG. 6 is a flowchart of determining base station weights and implementing power control according to the priority of the service users of the base station and the number of users corresponding to each priority;

Step 601: The base station 1 performs interference measurement together with the subordinate terminal, and determines, according to the measurement result, whether to send the co-channel interference coordination request to the central control node;

The measurement result includes: a center frequency of the interfered spectrum, a bandwidth, and an intensity of the same-frequency interference; Step 602: The base station 1 sends a co-channel interference coordination request to the CCP;

Step 603: After receiving the request of the base station 1, the CCP determines the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the subordinate base station;

The same-frequency base station of the base station 1 refers to a base station that uses the same or overlapping interference frequency as the subordinate terminal of the base station 1. In this embodiment, the same-frequency base station of the base station 1 is the base station 2, 3; the adjacent-frequency base station of the base station 1 Refers to a base station that uses a spectrum adjacent to the interfered spectrum of the terminal of the base station 1.

Step 604: The base station 1, 2, and 3 provide the same-frequency interference coordination parameter information to the CCP according to the request of the CCP, including the priority of the service user, the number of users corresponding to each priority, the reference point position in the base station, and the points in the coverage area of the base station. The minimum value of the maximum interference level, the path loss between the same-frequency base station of the base station and the reference point, the antenna pattern of the base station, and the upper limit of the current transmit power of the base station; the method for obtaining the data of each parameter is as follows:

The priority of the service user can be selected by the user when the account is opened, or determined according to the user's consumption behavior and/or according to the user's QoS requirements;

The minimum value of the maximum interference level that can be accepted at each point in the coverage area of the base station, and the same-frequency base station of the base station Step 605: The adjacent-frequency base station of the base station 1 provides the adjacent-frequency interference coordination parameter information to the CCP according to the request of the CCP, including the path loss between the adjacent-frequency base station of the base station 1 and all the reference points in the base stations 1, 2, and 3, and the base station Antenna pattern, adjacent channel interference suppression (ACIR). The method for obtaining the data of each parameter is as follows:

The path loss between the adjacent base station of the base station 1 and all reference points in the base stations 1, 2, 3 can be determined by road test, simulation, system warm-up, etc.

The adjacent channel interference suppression (ACIR) can be calculated from the indicators of the transmitter and receiver according to the center frequency and bandwidth of the interfered spectrum, or can be determined by road test, simulation, system warm-up, etc. Step 606: CCP pair The base stations 1, 2, and 3 perform interference coordination.

The CCP performs interference coordination by: first assigning power weights to the base stations 1, 2, and 3 according to the priority of the service users in the co-channel interference coordination parameters and the number of users corresponding to each priority; and then, according to the adjacent frequency interference coordination parameters, other Co-channel interference coordination parameters, weights of base stations 1, 2, 3, and maximum transmit power when base stations 1, 2, 3 use the interfered spectrum, while ensuring acceptable downlink interference generated by base stations 1, 2, 3 Calculate the maximum transmit power of the base stations 1, 2, 3; Finally, the CCP informs the base stations 1, 2, 3 to operate according to the maximum transmit power calculated by the CCP.

The method for determining the power weight is as follows: Assume that the priority of the user is represented by N1, N2, and N3 respectively, and the priority of N1 is the highest, N2 is the second, and N3 is the lowest. The number of users corresponding to the priorities of the service users of the base station k can be set to n. _Kl , n _k2 , n _k3 ( k=l, 2, 3 ) correspond to Nl, N2, and N3, respectively. The weight of base station k can be expressed as _k . Among them, 0.6 n _kl ,

0.6, 0.3, and 0.1 in 0.3n _k2 and 0.1n _k3 are to reflect the priority levels of n _kl , n _k2 , and _3. Therefore, n _kl , n _k2 , and n _k3 respectively use coefficients of 0.6, 0.3, and 0.1. Similarly, similar other coefficients can be used to indicate the priority level, for example: 0.7n _kl , 0.2n _k2 , 0.1n _k3 „

Method for calculating the maximum transmit power of an intra-frequency base station:

First, the base station 1 is the working base station, and the reference points of the base station 2 and the base station 3 in the base station 1 are respectively ₁₂ and i ₁₃ , and the reference in the base station 1 is calculated according to the minimum receiver sensitivity and the receiver interference protection ratio of the user terminal at the reference point ₁₂ . The maximum interference level hcceptable(in, fj ) that can be accepted when the user terminal at point ₁₂ uses the frequency ^, is calculated as:

Where x- τ^ΐίίτ^ ^, / represents the minimum receiver sensitivity of the user terminal at the reference point, and PR represents the receiver 4 protection ratio.

Further, calculate the maximum transmit power of the base station A = 2,

∑ ₌₁ , „ _{≠ 1} μ _η represents the sum of the weights of the other two intra-frequency base stations except the working base station 1, where the adjacent frequency of the spectrum fj is represented; P _tx (fj, kk) represents the base station kk using the adjacent frequency The maximum transmit power, L _p (i ₁₂ , fjj, represents the path loss between the base station using the adjacent frequency ^ and the reference point ₁₂ ; 0 (ί ₁₂ ,: ί _] Ί , kk) indicates the total base station using the adjacent frequency ^ Gain, including antenna gain, antenna pattern, etc.; Oj represents the number of adjacent frequencies; N represents the number of base stations using adjacent frequencies, and the adjacent channel interference ratio is represented.

Similarly, the base station k (k=2,3) is calculated according to the weight of each base station _μ3⁄4 and the maximum interference level I _acceptable (i , ^) that the user terminal can use at the reference point ₁₃ in the working base station 1 to use the frequency. Maximum transmit power /^(ί ₁₃ , /^

Finally, take mini/^ u, ;., /^, / ³ ^^, ;., /^} is the estimated maximum transmit power of the base station k calculated by the base station k (k=2, 3) relative to the working base station 1.

Similarly, the base station 2 is selected as the working base station, and the estimated maximum transmission power of the base station A=7 is calculated as min{ _tx (i ₂₁ , fj , k), P _tx (i ₂₃ , fj , k)). When the base station 3 is selected as the working base station, the calculated base station: (k=l, 2) has an estimated maximum transmit power of ηίηί/^ :^,;., /^, /^^:^,;., /^} » Until all co-frequency base stations are selected as one working base station.

Assuming that the current maximum transmit power of the base station k is P _max _ _fc = 1, 2, 3 ), the maximum transmit power of each base station is:

Maximum transmit power of base station 1:

Min{min{P _tx (i ₂₁ ,fj, l), P _tx i ₂₃ ,fj, l)}, min{P _tx (i ₃₁ , fj, l), P _tx i ₃₂ ,fj, l)}, P _max — i} Maximum transmit power of base station 2:

Min{min{P _tx (i ₁₂ , f _jt 2), P _tx (i ₁₃ , fj, 2)}, min{P _tx (i ₃₁ , f _jt 2), P _tx (i ₃₂ , fj, 2) }, P _{max 2} } Maximum transmit power of base station 3:

Min{min{P _tx (i ₁₂ , fj, 3), P _tx (i ₁₃ , fj, 3)}, min{P _tx (i ₂₁ , fj, 3), P _tx (i ₂₃ , fj, 3) }, P _{max 3} } where _mT1 represents the reference point (n, m=l, 2, 3 n≠m ") of the base station n with respect to the working base station m.

Application example 3

FIG. 7 is a flowchart of determining a base station weight according to a load condition of a base station, and implementing power control, specifically including:

Step 701: The base station 1 performs interference measurement together with the subordinate terminal, and determines, according to the measurement result, whether to send the co-channel interference coordination request to the central control node;

The measurement result includes: a center frequency of the interfered spectrum, a bandwidth, and an intensity of the same-frequency interference; Step 702: The base station 1 sends a co-channel interference coordination request to the CCP;

Step 703: After receiving the request of the base station 1, the CCP determines the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the subordinate base station;

Step 704: The base station 1, 2, and 3 provide the CCP with the same-frequency interference coordination parameter information according to the request of the CCP, including the load status of the base station, the reference point position in the base station, and the minimum value of the maximum interference level acceptable at each point in the coverage area of the base station. a path loss between the same-frequency base station of the base station and the reference point, an antenna pattern of the base station, and an upper limit value of the current transmit power of the base station;

The method for obtaining the data of each parameter is as follows:

The load status refers to the base station according to the current radio resource status (Radio Resource Status) and / Or a load level determined by the integrated available capacity information;

The minimum value of the maximum interference level that can be accepted at each point in the coverage area of the base station, and the same-frequency base station of the base station

Step 705: The adjacent-frequency base station of the base station 1 provides the adjacent-frequency interference coordination parameter information to the CCP according to the request of the CCP, including the path loss between the adjacent-frequency base station of the base station 1 and all reference points of the base stations 1, 2, and 3, the adjacent frequency. Antenna pattern of the base station, adjacent channel interference suppression (ACIR).

The method for obtaining the data of each parameter is as follows:

The path loss between the adjacent base station of the base station 1 and all reference points of the base stations 1, 2, 3 can be determined by means of road test, simulation, system warm-up, etc.;

The adjacent channel interference suppression (ACIR) can be calculated from the indicators of the transmitter and receiver according to the center frequency and bandwidth of the interfered spectrum, or can be determined by road test, simulation, system warm-up, etc. Step 706: CCP pair Base station 1, 2, 3 perform interference coordination;

The method for performing interference coordination by the CCP is: first, assigning power weights to the base stations 1, 2, and 3 according to the load status of the base station in the co-channel interference coordination parameter; and then, according to the adjacent frequency interference coordination parameters, other co-channel interference coordination parameters, the base station 1 The weights of 2, 3 and the maximum transmit power when the base station 1, 2, 3 uses the interfered spectrum, and calculate the base stations 1, 2, 3 in case the downlink interference generated by the base stations 1, 2, 3 is acceptable. The maximum transmit power; the final CCP informs the base station 1, 2, 3 to operate according to the maximum transmit power calculated by the CCP.

In the following, only the method for determining the power weight of each base station will be described. The calculation method of the maximum transmit power of each base station is the same as that of the application example 2.

In the application example 3, the method for determining the weight of each base station is as follows: The load status of the base station is divided into levels, for example, four levels including overload, high, medium, and low, and can be used by L1, L2, L3, and L4. The representation may also be represented by an integer between 0 and 100. The higher the level or the larger the value, the higher the expected transmission power of the base station. The weight of the base station k can be expressed as _k = ^ , where l _k 6 {1^Λ ₂ Λ ₃ Λ ₄ } or l _k 6 {0,1...: LOO}; The value range of l _k depends on the load status of the base station Representation. Application example 4

FIG. 8 is a flowchart of determining a weight according to a priority of a service user of a base station, a number of users corresponding to each priority, and a load status of the base station, and implementing power control, specifically including:

Step 801: The base station 1 performs interference measurement together with the subordinate terminal, and determines, according to the measurement result, whether to send the co-channel interference coordination request to the central control node;

The measurement result includes: a center frequency of the interfered spectrum, a bandwidth, and an intensity of the same-frequency interference; Step 802: The base station 1 sends a co-channel interference coordination request to the CCP;

Step 803: After receiving the request of the base station 1, the CCP determines the same-frequency base station of the base station 1 and the adjacent-frequency base station of the base station 1 in the subordinate base station;

Step 804: The base station 1, 2, and 3 provide the CCP with the same-frequency interference coordination parameter information according to the request of the CCP, including the priority of the service user, the number of users corresponding to each priority, and the load status of the base station, the reference point position in the base station, and the base station. a minimum value of the maximum interference level acceptable at each point in the coverage area, a path loss between the same-frequency base station of the base station and the reference point, an antenna pattern of the base station, and an upper limit value of the current transmit power of the base station;

The method for obtaining the data of each parameter is as follows:

The priority of the service user can be selected at the time of user account opening, or determined according to the user's consumption behavior and/or determined according to the user's QoS requirements;

The reference point in the base station is the point where the same-frequency base station of the base station has the strongest interference in the coverage area of the base station, and the position of the reference point can be determined by means of road test, simulation, system warm-up, and the like; The minimum value of the maximum interference level that can be accepted at each point in the coverage area of the base station, and the same-frequency base station of the base station

Step 805: The neighboring base station of the base station 1 provides the adjacent channel interference coordination parameter information to the CCP according to the request of the CCP, including the path loss between the adjacent base station of the base station 1 and all reference points of the base stations 1, 2, and 3, the adjacent frequency. Antenna pattern of the base station, adjacent channel interference suppression (ACIR).

The method for obtaining the data of each parameter is as follows:

The adjacent channel interference suppression (ACIR) can be calculated from the indicators of the transmitter and receiver according to the center frequency and bandwidth of the interfered spectrum, or can be determined by road test, simulation, system warm-up, etc. Step 806: CCP pair Base station 1, 2, 3 perform interference coordination;

The CCP performs interference coordination by: first assigning power weights to the base stations 1, 2, and 3 according to the priority of the service users in the co-channel interference coordination parameters, the number of users corresponding to each priority, and the load status of the base station; Coordinating parameters, power weights of base stations 1, 2, 3, and maximum transmit power when base stations 1, 2, 3 use the interfered spectrum, and calculating if downlink interference generated by base stations 1, 2, 3 is acceptable The maximum transmit power of the base stations 1, 2, 3; The last CCP informs the base stations 1, 2, 3 to operate according to the maximum transmit power calculated by the CCP.

In the application example 4, the weight determination method of each base station is as follows: It is assumed that the priorities of the users are represented by N1, N2, and N3, respectively, the N1 priority is the highest, the N2 is the second, and the N3 is the lowest, and the base station; t the subordinate service users have corresponding priorities. The number of users can be set to n _fcl , n _k2 , n _k3 =l, 2, 3 ), corresponding to Nl, N2, N3 respectively. The load status of the base station is divided into levels, including four levels of overload, high, medium, and low, which can be represented by L ₂ , L ₃ , and L ₄ , or by an integer between 0 and 100. A higher or higher value indicates that the base station expects a higher transmission power. Base station k weight

= 0.3 (^f- + -^ - + ^f-) + 0.7 _T ,l _k G {L _1; L ₂ , L ₃ , L ₄ } or l _k e {0,1...: 100}; Z _fc The range of values depends on the representation of the base station load condition. Among them, 0.6, 0.3, and 0.1 of 0.6n _fcl , 0.3n _fc2 , and 0.1n _fc3 are used to reflect the priority levels of n _fcl , n _k2 , and n _fc3 . Therefore, n _kl , n _k2 , and n _fc3 are respectively used. The coefficients are 0.6, 0.3 and 0.1. Similarly, similar other coefficients can be used to indicate the priority level, for example: 0.7n _fcl , 0.2n _fc2 , 0.1n _fc3 . In addition, when calculating the weight / 1⁄2, the weight calculated according to the number of users corresponding to each priority of the service users of each base station is multiplied by a coefficient of 0.3, and the weight calculated according to the load status of the base station is multiplied by a coefficient of 0.7, indicating that the total weight is calculated. The load status of the base station is more important, and the percentage of the base station is 70%. The percentage of the weight calculated according to the number of users corresponding to the priority of the service users of each base station is 30%, and the percentage can be based on the network. The actual situation or management needs to be changed and set in advance. In order to achieve the above method, the present invention also provides a co-channel interference coordination device, and particularly relevant to the present invention, as shown in FIG. 9, the device includes:

The interference coordination request receiving unit is configured to receive the co-channel interference coordination request sent by the interfered base station, and the interference coordination parameter information acquiring unit is configured to acquire interference coordination parameter information of the interfered base station, the same-frequency base station, and the adjacent-frequency base station, The spectrum used by the same-frequency base station of the interfered base station is the same as or overlaps with the interfered spectrum, and the spectrum used by the adjacent-frequency base station of the interfered base station is adjacent to the interfered frequency.

And an interference coordination unit, configured to perform interference coordination on the interfered base station and the same-frequency base station according to the interference coordination parameter.

And a neighboring frequency base station determining module, configured to determine, according to the co-frequency interference coordination request, an intra-frequency base station of the interfered base station and an adjacent-frequency base station of the interfered base station;

An information sending module, configured to send an interference coordination parameter information request to the interfered base station, the same-frequency base station of the interfered base station, and an adjacent-frequency base station of the interfered base station;

And an information receiving module, configured to receive interference coordination parameter information fed back by the interfered base station, the same-frequency base station of the interfered base station, and an adjacent-frequency base station of the interfered base station.

Specifically, the co-frequency interference coordination request carries the interfered spectrum of the interfered base station a heart rate point and a bandwidth, the interference coordination parameter information obtaining unit determining, according to the center frequency point and bandwidth in the co-channel interference coordination request, an adjacent frequency base station of the interfered base station and an adjacent frequency of the interfered base station Base station.

Optionally, the triggering event that the interfered base station sends the co-frequency interference coordination request is for the same interfered spectrum, and the terminal that is subjected to the same-frequency interference strength greater than the preset interference strength threshold is compared to the terminal that reports the measurement result. The percentage exceeds a certain preset value, or the number of terminals whose intensity of the same frequency interference is greater than the interference intensity threshold exceeds a certain preset value.

Preferably, the information used by the current base station to determine the weight allocation of the same-frequency base station includes the priority of the current base station serving user, the number of users corresponding to each priority, and/or the load status of the base station.

Preferably, the interference coordination unit comprises:

a power weight allocation module, configured to allocate power weights to the interfered base station and its co-frequency base station according to the information used to determine the power allocation weight of the same-frequency base station;

a maximum transmit power calculation module, configured to calculate, according to the power weight assignment result, other interference coordination parameter information, and the current transmit power upper limit value of the interfered base station and the same-frequency base station, that the downlink interference is acceptable, the interfered base station and The maximum transmit power of its co-frequency base station;

And a power adjustment notification module, configured to notify the interfered base station and its co-frequency base station to adjust transmit power to be less than or equal to the maximum transmit power.

The co-channel interference coordination device of the present invention can also be implemented in the following manner, the device comprising: a memory for storing instructions;

a processor coupled to the memory, the processor being configured to execute an instruction stored in the memory, wherein the processor is configured to: receive a co-channel interference coordination request sent by the interfered base station;

Performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter. As described above, the interference coordination parameter information of the interfered base station and its co-frequency base station includes information of the current base station for determining the power allocation weight of the same-frequency base station, the location of the reference point in the current base station, and the current base station coverage area. The minimum value of the maximum interference level, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current transmit power of the current base station;

In the invention, the base station provides the central control node with information for determining the power allocation weight of the same frequency base station, interference coordination parameter information, and interference coordination with the same frequency base station. The benefits are as follows: The quality of service of high-priority users can be guaranteed, and the downlink interference generated when different base stations use the same spectrum is controlled at a reasonable level to achieve co-channel interference coordination between cells.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention. One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial Applicability The method and apparatus of the embodiments of the present invention can adjust the power of the same-frequency base station based on the acquired information, thereby reducing co-channel interference between cells.

Claims

Claim

1. A co-channel interference coordination method, the method comprising:

Performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter.

2. The method according to claim 1, wherein the step of acquiring interference coordination parameter information of the interfered base station, its co-frequency base station, and the adjacent frequency base station comprises:

The method according to claim 1 or 2, wherein the co-channel interference coordination request carries a center frequency point and a bandwidth of the interfered spectrum of the interfered base station, according to the co-channel interference coordination request The center frequency and bandwidth determine the same-frequency base station of the interfered base station and the adjacent-frequency base station of the interfered base station.

The method according to claim 1 or 2, wherein the triggering event of the interfering base station transmitting the co-channel interference coordination request is for the same interfered spectrum, and the strength of the same-frequency interference is greater than the preset interference intensity The percentage of the terminal of the value relative to the terminal reporting the measurement result exceeds a certain preset value, or the number of terminals whose intensity of the same frequency interference is greater than the interference intensity threshold exceeds a certain preset value.

5. The method according to claim 1, wherein the interference coordination parameter information of the interfered base station and its co-frequency base station comprises information of a current base station for determining a power allocation weight of an intra-frequency base station, and a reference point in the current base station. Location, the maximum interference level can be accepted at each point in the current base station coverage area. The minimum value, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the upper limit value of the current base station's current transmit power; the interference of the adjacent base station of the interfered base station The coordination parameter information includes a path loss between the adjacent frequency base station and a reference point in the same frequency base station, an antenna pattern of the adjacent frequency base station, and adjacent channel interference suppression (ACIR);

The method according to claim 5, wherein the information used by the current base station to determine the power allocation weight of the same-frequency base station includes the priority of the current base station serving user, the number of users corresponding to each priority, and/or the load of the base station. situation.

7. The method according to claim 5, wherein the step of performing interference coordination on the interfered base station and its co-frequency base station according to the interference coordination parameter comprises:

8. A co-channel interference coordination device, the device comprising:

The apparatus according to claim 8, wherein the interference coordination parameter information acquiring unit comprises: a same neighboring frequency base station determining module, configured to: determine, according to the co-channel interference coordination request, the same-frequency base station of the interfered base station and An adjacent frequency base station of the interfered base station;

10. The apparatus according to claim 8, wherein the interference coordination parameter information of the interfered base station and its co-frequency base station comprises information of a current base station for determining a power allocation weight of an intra-frequency base station, and a reference point in a current base station. The location, the minimum value of the maximum interference level acceptable at each point in the current coverage area of the base station, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the current transmit power of the current base station. Upper limit;

The device according to claim 10, wherein the interference coordination unit comprises: a power weight allocation module, configured to: determine, according to the information for determining a power allocation weight of an intra-frequency base station, the victim base station The same frequency base station allocates power weights;

a power adjustment notification module, configured to: notify the interfered base station and its co-frequency base station to transmit The power is adjusted to be less than or equal to the maximum transmit power.

12. A co-channel interference coordination device, the device comprising:

a memory, which is set to: store instructions;

13. The apparatus according to claim 12, wherein the interference coordination parameter information of the interfered base station and its co-frequency base station comprises information of a current base station for determining a power allocation weight of an intra-frequency base station, and a reference point in a current base station. The location, the minimum value of the maximum interference level acceptable at each point in the current coverage area of the base station, the path loss between the intra-frequency base station of the current base station and the reference point, the antenna pattern of the current base station, and the current transmit power of the current base station. Upper limit;