CN106304367B - Inter-cell interference coordination method and device - Google Patents

Abstract

The present invention provides an inter-cell interference coordination method and device, including: a cell determines whether there is a high-interference area in the cell according to the received interference power RIP measured by the cell; if there is a high-interference area in the cell, determines the high-interference frequency band of the cell Whether it is interfered by neighboring cells of the same base station; if the high-interference frequency band of this cell is interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of users in the center of the neighboring cells is adjusted. The method can coordinate the inter-cell interference, effectively reduce the inter-system interference, take into account the utilization of system resources, ensure the system capacity, and has stronger real-time performance.

Description

Inter-cell interference coordination method and device

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a method and device for inter-cell interference coordination.

Background technique

The Long Term Evolution (LTE) system uses the Single-Carrier Frequency-Division Multiple Access (SC-FDMA) technology for the uplink as the multiple access technology, which can ensure that users in the cell The orthogonality between cells can avoid interference between users in a cell. However, due to the distributed control of LTE, there is serious interference between cells when the entire network adopts the same frequency networking, which affects the uplink throughput.

Interference coordination technology is the key technology for LTE system to suppress inter-cell interference. The goal of interference coordination technology is to determine the resource interference status of each cell at any time, and allocate the above resources to suitable users through the scheduler, so as to maintain the balance of inter-cell interference. Avoid disturbances from getting worse. Interference coordination technology is divided into dynamic interference coordination technology and static interference coordination technology. Static interference coordination technology uses frequency band planning to avoid strong interference, such as Fractional Frequency Reuse (FFR, or Part Frequency Reuse, PFR for short) and soft frequency reuse scheme.

The process of the current uplink inter-cell interference coordination method is to judge the interference status of users in the cell, and perform resource negotiation between adjacent cells according to the overload indicator (OI) and high interference indication (HII) information, and finally User resource scheduling is then performed within the limited resources according to the negotiation result. Considering the distributed control state of behavior on LTE, the negotiation process between neighboring cells is very divergent and not easy to converge.

In view of this, how to coordinate the inter-cell interference and effectively reduce the inter-system interference has become a technical problem that needs to be solved at present.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides an inter-cell interference coordination method and device, which can coordinate inter-cell interference, effectively reduce inter-system interference, take into account system resource utilization, ensure system capacity, and improve real-time performance. powerful.

In a first aspect, the present invention provides an inter-cell interference coordination method, including:

The cell determines whether there is a high interference area in the cell according to the received interference power RIP measured by the cell;

If there is a high-interference area in this cell, determine whether the high-interference frequency band of this cell is interfered by the adjacent cells of the same base station;

If the high-interference frequency band of this cell is interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of central users of the neighboring cells is adjusted.

Optionally, if the high-interference frequency band of the current cell is interfered by neighboring cells of the same base station, triggering interference coordination between neighboring cells of the same base station, and adjusting the number of central users in the neighboring cells, including:

If the high-interference frequency band of this cell is highly interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to reduce the number of central users in the neighboring cells;

If the high-interference frequency band of this cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to increase the number of users in the center of the neighboring cell.

Optionally, before adjusting the number of center users in neighboring cells, the method further includes:

A cell determines the number of central users in the cell.

Optionally, the cell determines the number of central users in the cell, including:

The cell determines the number of central users in the cell according to the preset division threshold of the central user and the number of all user equipments in the cell;

Correspondingly, if the high-interference frequency band of the cell is interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of center users of the neighboring cells is adjusted, including:

If the high-interference frequency band of this cell is interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of center users of the neighboring cell is adjusted by adjusting the preset division threshold of the center user.

Optionally, if the high-interference frequency band of the local cell is interfered with by adjacent cells of the same base station, triggering interference coordination between adjacent cells of the same base station, and adjusting the preset division threshold of central users to adjust the number of central users in this cell, including:

If the high-interference frequency band of this cell is highly interfered by the adjacent cells of the same base station, the interference coordination between the adjacent cells of the same base station is triggered, and the user status is re-determined for all users through the preset division threshold of the central user, thereby reducing the number of central users in the adjacent cell;

If the high-interference frequency band of the local cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of center users in the neighboring cell is increased by adjusting the preset division threshold of the center user.

Optionally, before the cell determines whether there is a high interference area in the cell according to the received interference power RIP measured by the cell, the method further includes:

The cell judges whether the RIP reporting period arrives, and if so, stores the RIP reported when the RIP reporting period arrives.

In a second aspect, the present invention provides an inter-cell interference coordination device, comprising:

The first judgment module is used for the cell to judge whether there is a high interference area in the cell according to the received interference power RIP measured by the cell;

The second judgment module is used to judge whether the high-interference frequency band of this cell is interfered by the adjacent cells of the same base station if there is a high-interference area in this cell;

The adjustment module is used for triggering interference coordination between adjacent cells of the same base station and adjusting the number of central users of the adjacent cells if the high-interference frequency band of the cell is interfered by the adjacent cells of the same base station.

Optionally, the adjustment module is specifically used for

If the high-interference frequency band of this cell is highly interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to reduce the number of central users in the neighboring cells;

If the high-interference frequency band of this cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to increase the number of users in the center of the neighboring cell.

Optionally, before the adjustment module is used to adjust the number of users in the center of the cell, it is also used to

A cell determines the number of central users in the cell.

Optionally, the device further includes:

The third judging module is used for the cell to judge whether the reporting period of the RIP arrives, and if so, the RIP reported when the reporting period of the RIP arrives is stored.

It can be seen from the above technical solutions that the method and device for inter-cell interference coordination of the present invention, by introducing an interference analysis process in uplink interference coordination, after judging the nature of the interference source, adaptively adjusts the user's interference state, and triggers co-site in time for inter-sector interference. The adjustment of the interference state of users in neighboring cells can effectively reduce the inter-system interference, and at the same time take into account the utilization of system resources, ensure system capacity, and have stronger real-time performance.

Description of drawings

FIG. 1 is a schematic flowchart of a method for inter-cell interference coordination provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a method for inter-cell interference coordination provided by another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an apparatus for inter-cell interference coordination according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a method for inter-cell interference coordination provided by an embodiment of the present invention. As shown in FIG. 1 , the method for inter-cell interference coordination in this embodiment is as follows.

101. The cell determines whether there is a high interference area in the cell according to the received interference power (Received Interference Power, RIP for short) measured in the cell.

102. If there is a high-interference area in the cell, determine whether the high-interference frequency band of the cell is interfered by a neighboring cell of the same base station.

103. If the high-interference frequency band of the cell is interfered by the neighboring cells of the same base station, trigger the interference coordination between the neighboring cells of the same base station, and adjust the number of central users of the neighboring cells.

In the inter-cell interference coordination method of this embodiment, the cell determines whether there is a high-interference area in the cell according to the received interference power RIP measured by the cell. Interference from neighboring cells. If the high-interference frequency band of this cell is interfered by neighboring cells of the same base station, the interference coordination between neighboring cells of the same base station will be triggered, and the number of central users in neighboring cells will be adjusted. The interference analysis process is introduced. After judging the nature of the interference source, the user interference status is adaptively adjusted, and the user interference status adjustment of the adjacent cells of the same site is triggered in time for the inter-sector interference, which can effectively reduce the inter-system interference and take into account the system resource utilization. Guaranteed system capacity and stronger real-time performance.

In a specific application, the above step 103 may include:

If the high-interference frequency band of this cell is highly interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to reduce the number of central users in the neighboring cells;

If the high-interference frequency band of this cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to increase the number of users in the center of the neighboring cell.

In a specific application, in the above step 103, before adjusting the number of center users in neighboring cells, the method further includes:

A cell determines the number of central users in the cell.

Further, the cell determines the number of central users in the cell, which may include:

The cell determines the number of central users in the cell according to the preset division threshold of the central user and the number of all user equipments in the cell;

Correspondingly, the above step 103 may be specifically step 103':

103'. If the high-interference frequency band of this cell is interfered with by the adjacent cells of the same base station, the interference coordination between the adjacent cells of the same base station is triggered, and the number of central users of the adjacent cells is adjusted by adjusting the preset division threshold of the central user.

Further, the above-mentioned step 103' may include:

If the high-interference frequency band of this cell is highly interfered by the adjacent cells of the same base station, the interference coordination between the adjacent cells of the same base station is triggered, and the user status is re-determined for all users through the preset division threshold of the central user, thereby reducing the number of central users in the adjacent cell;

If the high-interference frequency band of the local cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of center users in the neighboring cell is increased by adjusting the preset division threshold of the center user.

In a specific application, before the above step 101, the step 100 not shown in the figure may also be included:

100. The cell determines whether the RIP reporting period has arrived, and if so, stores the RIP reported when the RIP reporting period arrives.

In the method for inter-cell interference coordination in this embodiment, an interference analysis process is introduced into the uplink interference coordination in the same-frequency network, and after judging the nature of the interference source, the user interference state is adaptively adjusted, and the adjacent cells of the same site are triggered in time for inter-sector interference. The user interference state adjustment can effectively reduce the inter-system interference, at the same time take into account the utilization of system resources, ensure system capacity, and have stronger real-time performance.

It should be noted that, in this embodiment, the sources of interference within the cell are different, the interference coordination with the neighboring cells of the same base station is to adjust the user interference state in time, and the interference coordination between neighboring cells of different base stations can use neighboring cells according to the overload indication OI reporting information. Interference band negotiation mechanism.

FIG. 2 shows a schematic flowchart of a method for inter-cell interference coordination provided by another embodiment of the present invention. As shown in FIG. 2 , the method for inter-cell interference coordination in this embodiment is as follows.

201. The cell judges whether the RIP reporting period of the received interference power measured by the cell arrives, and if so, stores the RIP reported when the RIP reporting period arrives.

202. The cell determines whether there is a high interference area in the cell according to the RIP measured by the cell.

203. If there is a high-interference area in the cell, determine whether the high-interference frequency band of the cell is interfered by a neighboring cell of the same base station.

204. If the high-interference frequency band of the cell is highly interfered by the neighboring cells of the same base station, trigger the interference coordination between the neighboring cells of the same base station, and re-determine the user status for all users through the preset division threshold of the central user, thereby reducing the number of central users in the neighboring cell. .

205. If the high-interference frequency band of the local cell suffers from low interference from neighboring cells of the same base station, trigger inter-interference coordination between neighboring cells of the same base station, and increase the number of center users in neighboring cells by adjusting the preset division threshold of center users.

In a specific application, in the above step 204, before re-determining the user status for all users through the central user preset division threshold, and then adjusting (reducing/increasing) the number of central users in this cell, the method further includes:

A cell determines the number of central users in the cell.

In a specific application, in the above step 205, before reducing the number of center users in this cell by increasing the preset division threshold of center users, the method further includes:

A cell determines the number of central users in the cell.

The inter-cell interference coordination method in this embodiment can effectively reduce the inter-system interference in the same-frequency networking, while taking into account the system resource utilization rate, ensuring the system capacity, and having stronger real-time performance.

FIG. 3 shows a schematic structural diagram of an apparatus for inter-cell interference coordination provided by an embodiment. As shown in FIG. 3 , the apparatus for inter-cell interference coordination in this embodiment includes: a first judgment module 31 , a second judgment module 32 and an adjustment module 33;

The first judgment module 31 is used for the cell to judge whether there is a high interference area in the cell according to the received interference power RIP measured by the cell;

The second judging module 32 is configured to judge whether the high-interference frequency band of the local cell is interfered by the adjacent cells of the same base station if there is a high-interference area in the local cell;

The adjustment module 33 is configured to trigger interference coordination between adjacent cells of the same base station and adjust the number of central users in the adjacent cells if the high-interference frequency band of the cell is interfered with by adjacent cells of the same base station.

In a specific application, the adjustment module 33 can be specifically used for

If the high-interference frequency band of this cell is highly interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to reduce the number of central users in the neighboring cells;

If the high-interference frequency band of this cell is subject to low interference from the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered to increase the number of users in the center of the neighboring cell.

In a specific application, before the adjustment module 33 is used to adjust the number of center users in neighboring cells, it further includes:

It is used for the cell to determine the number of central users in the cell.

Further, for example, before the adjustment module 33 is used to adjust the number of users in the center of the cell, it can also be used to

According to the preset division threshold of the central user, it is judged whether the user in the cell is the central user;

Correspondingly, the adjustment module 33 can be specifically used for

If the high-interference frequency band of this cell is interfered by the neighboring cells of the same base station, the interference coordination between the neighboring cells of the same base station is triggered, and the number of center users of the neighboring cell is adjusted by adjusting the preset division threshold of the center user.

Further, the adjustment module 33 can be specifically used for

If the high-interference frequency band of this cell is highly interfered by the adjacent cells of the same base station, the interference coordination between the adjacent cells of the same base station is triggered, and the user status is re-determined for all users through the preset division threshold of the central user, thereby reducing the number of central users in the adjacent cell;

If the high-interference frequency band of the local cell is subject to low interference from the adjacent cells of the same base station, the interference coordination between the adjacent cells of the same base station is triggered, and the number of central users in this cell is increased by adjusting the preset division threshold of central users.

In a specific application, the apparatus for inter-cell interference coordination in this embodiment may further include not shown in the figure:

The third judging module is used for the cell to judge whether the reporting period of the RIP arrives, and if so, the RIP reported when the reporting period of the RIP arrives is stored.

The inter-cell interference coordination device in this embodiment can effectively reduce the inter-system interference in the same-frequency networking, and at the same time take into account the system resource utilization rate, ensure the system capacity, and have stronger real-time performance.

The apparatus for inter-cell interference coordination in this embodiment can be used to implement the technical solutions of the foregoing method embodiment shown in FIG. 1 , and the implementation principles and technical effects thereof are similar, and are not repeated here.

In the embodiments of the present invention, "first", "second", "third", etc. do not define the sequence, but only distinguish the names, and do not make any limitation in this implementation manner.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by program instructions related to hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps including the above method embodiments are executed; and the foregoing storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. An inter-cell interference coordination method, comprising:

the cell judges whether a high interference area exists in the cell according to the received interference power RIP measured by the cell;

if the cell has a high interference area, judging whether the high interference frequency band of the cell is interfered by the adjacent cell of the same base station;

if the high interference frequency band of the cell is interfered by the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and adjusting the number of central users of the adjacent cells;

the adjusting of the number of users in the center of the neighboring cell specifically comprises: and adjusting the number of the central users by adjusting the preset division threshold of the central users.

2. The method of claim 1, wherein the triggering interference coordination between neighboring cells of the same base station and adjusting the number of central users of neighboring cells if the high interference frequency band of the local cell is interfered by neighboring cells of the same base station comprises:

if the high interference frequency band of the cell is subjected to high interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and reducing the number of central users of the adjacent cells;

if the high interference frequency band of the cell is subjected to low interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and increasing the number of central users of the adjacent cells.

3. The method of claim 1, further comprising, before adjusting the number of neighbor cell center users:

the cell determines the number of central users in the cell.

4. The method of claim 3, wherein the cell determines the number of central users in the cell, and comprises:

the cell judges the number of the central users in the cell according to a preset division threshold of the central users and the number of all user equipment in the cell;

correspondingly, if the high interference frequency band of the cell is interfered by the neighboring cells of the same base station, triggering interference coordination between the neighboring cells of the same base station, and adjusting the number of central users of the neighboring cells, the method includes:

if the high interference frequency band of the cell is interfered by the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and adjusting the number of the central users of the adjacent cells by adjusting the preset division threshold of the central users.

5. The method of claim 4, wherein if the high interference frequency band of the local cell is interfered by the neighboring cells of the same base station, triggering interference coordination between the neighboring cells of the same base station, and adjusting the number of central users of the local cell by adjusting a preset division threshold of the central user, comprises:

if the high interference frequency band of the cell is subjected to high interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and re-determining user states of all users through a preset division threshold of a central user so as to reduce the number of central users of the adjacent cells;

if the high interference frequency band of the cell is subjected to low interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and improving the number of central users of the adjacent cells by adjusting the preset division threshold of the central users.

6. The method according to any of claims 1-5, further comprising, before the cell determines whether there is a high interference area in the cell according to the received interference power RIP measured by the cell, the following:

and the cell judges whether the report period of the RIP reaches, and if so, the RIP reported when the report period of the RIP reaches is stored.

7. An apparatus for coordinating inter-cell interference, comprising:

the first judgment module is used for judging whether the cell has a high interference area according to the received interference power RIP measured by the cell;

the second judging module is used for judging whether the high interference frequency band of the cell is interfered by the adjacent cell of the same base station or not if the cell has the high interference area;

the adjusting module is used for triggering the interference coordination between the adjacent cells of the same base station and adjusting the number of central users of the adjacent cells if the high-interference frequency band of the cell is interfered by the adjacent cells of the same base station; the adjusting of the number of users in the center of the neighboring cell specifically comprises: and adjusting the number of the central users by adjusting the preset division threshold of the central users.

8. Device according to claim 7, characterized in that the adjustment module is, in particular, adapted to

If the high interference frequency band of the cell is subjected to high interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and reducing the number of central users of the adjacent cells;

if the high interference frequency band of the cell is subjected to low interference of the adjacent cells of the same base station, triggering interference coordination between the adjacent cells of the same base station, and increasing the number of central users of the adjacent cells.

9. The apparatus of claim 7, wherein the adjusting module is further configured to adjust the number of central users in the cell before the adjusting module is configured to adjust the number of central users in the cell

The cell determines the number of central users in the cell.

10. The apparatus of any of claims 7-9, further comprising:

and the third judging module is used for judging whether the report period of the RIP reaches or not by the cell, and if so, storing the RIP reported when the report period of the RIP reaches.

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