CN108365907B

CN108365907B - Method and device for eliminating interference

Info

Publication number: CN108365907B
Application number: CN201710061764.5A
Authority: CN
Inventors: 徐汉青
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-01-26
Filing date: 2017-01-26
Publication date: 2020-12-25
Anticipated expiration: 2037-01-26
Also published as: CN108365907A; WO2018137444A1

Abstract

Disclosed herein is a method of cancelling interference, comprising: determining a primary sub-band and a secondary sub-band of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands; and transmitting in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell, and transmitting in the uplink direction of the cell by using the primary subband of the cell. The cross-link interference problem can be solved.

Description

Method and device for eliminating interference

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for eliminating interference.

Background

In the past decades, mobile communication has experienced a dramatic increase from voice service to high-rate broadband data service. With the further development of new services such as mobile internet and internet of things, the new requirements of people on mobile networks will further increase. On the one hand, the future mobile network data traffic is expected to grow explosively. On the other hand, massive device connections and diversified services and applications are one of the important features of future wireless communication systems, and human-centered communication and machine-centered communication will be developed in a coexisting manner. Based on the diversified service and application requirements of future mobile communications, the wireless communication system must meet diversified requirements, such as requirements including multiple aspects of throughput, latency, reliability, link density, cost, energy consumption, complexity, and coverage.

The LTE system supports FDD (Frequency Division duplex) operation on paired spectrum, and also supports TDD (Time Division duplex) operation on an unpaired carrier. The traditional TDD operation mode can only apply a limited number of configuration modes (configuration mode 0-configuration mode 6) for uplink and downlink subframe allocation, and the same configuration, that is, the same transmission direction, is adopted between adjacent cells. The enhanced interference cancellation and traffic adaptation (eIMTA) may configure the uplink and downlink directions of the LTE system semi-statically (for more than 10 ms), and different configurations of TDD uplink and downlink subframe allocation may be used between adjacent cells, but these configurations are still limited to the above-mentioned limited configurations.

In order to meet the demand of fast service adaptation and further improve the spectrum utilization efficiency, a future wireless communication system (such as a 5G (Fifth Generation mobile communication technology)/NR (New Radio) system) should support dynamic TDD operation. Dynamic tdd (dynamic tdd), which may also be referred to as Flexible Duplexing (flexilduplexing) or duplex Flexibility (duplex Flexibility), refers to that the uplink or downlink transmission direction may be dynamically or semi-dynamically changed on an unpaired spectrum or on an uplink carrier or a downlink carrier in a paired spectrum. Dynamic TDD operation may support subframe-level, or slot-level, even more dynamic transmit direction changes compared to eIMTA. Moreover, the dynamic TDD does not limit the adoption of only the limited configuration modes of uplink and downlink subframe allocation, and can more flexibly schedule uplink and downlink transmission.

However, dynamic TDD faces serious CLI (Cross-Link Interference) problems. As shown in fig. 1(a), uplink transmission of a user terminal (UE2-1) in the second cell may cause cross-link interference (UE-to-UE (terminal-to-terminal) interference) to downlink reception of a user terminal (UE1-1) in the first cell; on the other hand, downlink transmissions by the base station of the second cell (gNB2) may cause cross-link interference (gNB-to-gNB interference) to uplink receptions by the base station of the first cell (gNB 1). The network side Node may include a TRP (Transmission/Reception Point), an AP (Access Point), and The like, in addition to a gNB (The Next Generation Node B).

The dynamic cross-link interference is different from the previous same-link interference, and has the characteristics of serious interference, large influence, quick direction change, no mature mechanism for solving the problem and the like. How to solve the problem of cross-link interference has not been a good solution.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method and a device for eliminating interference, which can solve the problem of cross-link interference.

The embodiment of the invention provides a method for eliminating interference, which comprises the following steps:

determining a primary sub-band and a secondary sub-band of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands;

and transmitting in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell, and transmitting in the uplink direction of the cell by using the primary subband of the cell.

Optionally, the determining the primary subband and the secondary subband of the cell includes:

determining the number and extent of subbands: dividing a system bandwidth into a plurality of sub-bands, wherein each sub-band comprises one or more Resource Blocks (RB), and any two sub-bands are not crossed and overlapped;

wherein, each RB in one sub-band is continuous or discontinuous; the number of RBs contained in different subbands may be the same or different.

Optionally, the sending in the downlink direction of the cell using the primary subband and/or the secondary subband of the cell includes:

downlink communication from a base station to cell edge User Equipment (UE) is transmitted by using a main sub-band, and the transmission power is greater than or equal to a high-power threshold;

downlink communication from a base station to cell center UE is transmitted by using a main sub-band and/or an auxiliary sub-band; and when downlink communication from the base station to the cell center UE is transmitted on the auxiliary sub-band, the transmission power is less than or equal to the low-power threshold.

Optionally, the sending in the downlink direction of the cell using the primary subband and/or the secondary subband of the cell, and the sending in the uplink direction of the cell using the primary subband of the cell include:

determining the interference situation of cross-link interference between a target cell and an adjacent cell, interacting the interference situation between the target cell and the adjacent cell and performing coordination processing for reducing interference: and determining the uplink or downlink transmission sub-band and/or transmission power of the target cell and the adjacent cell.

Optionally, the determining an interference situation of cross-link interference between a target cell and an adjacent cell, and interacting the interference situation between the target cell and the adjacent cell and performing coordination processing to reduce interference includes:

when the downlink interference of the adjacent cell received by the uplink direction of the target cell exceeds a first threshold, executing at least one of the following processes:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

the adjacent cell downlink of the target cell uses the main sub-band to transmit;

and the edge region downlink of the adjacent cell of the target cell uses the main subband to transmit.

when the interference of the uplink direction of the target cell to the downlink direction of the adjacent cell exceeds a second threshold, executing at least one of the following processes:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

when the uplink interference of the adjacent cell received by the downlink direction of the target cell exceeds a third threshold, executing at least one of the following processes:

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

the edge region downlink of the target cell is transmitted by using a master sub-band;

and the uplink of the adjacent cell of the target cell uses the main sub-band for transmission.

when the interference of the downlink direction of the target cell to the uplink direction of the adjacent cell exceeds a fourth threshold, executing at least one of the following processes:

the target cell reduces downlink transmission power;

the neighbor cell of the target cell increases the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

Optionally, the determining an interference situation of cross-link interference between the target cell and the neighboring cell includes: the base station of the target cell and/or the adjacent cell acquires measurement quantity for characterizing cross-link interference level, wherein the measurement quantity comprises at least one of the following measurement quantities:

the measurement quantity used for representing the downlink interference of the adjacent cell suffered by the cell uplink is as follows: cross-link interference-uplink-overload indication CLI-UL-OI;

measurement quantities used to characterize the interference that the cell uplink may cause to the neighbor cell downlink: cross-link interference-uplink-high interference indication CLI-UL-HII;

the measurement quantity used for representing the uplink interference of the adjacent cell suffered by the cell downlink is as follows: cross-link interference-downlink-overload indication (CLI-DL-OI);

measurement quantities used to characterize the interference that a cell downlink may cause to a neighbor cell uplink: cross-link interference-downlink-high interference indication CLI-DL-HII;

measurements used to characterize the reference signal received power level between the cell base station and the neighbor cell base station: cross-link interference-reference signal received power-base station CLI-RSRP-gNB;

measurements used to characterize the reference signal received power level between the cell user equipment UE and the neighbor cell UE: cross-link interference-reference signal received power-user equipment CLI-RSRP-UE.

Optionally, the interacting the interference situation between the target cell and the neighboring cell includes:

the measurement quantity is interacted between the base stations of the target cell and/or the adjacent cell in the following modes: backhaul link and/or air signaling.

The embodiment of the invention also provides a device for eliminating interference, which comprises:

a subband setting module, configured to determine a primary subband and a secondary subband of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands;

and the transmission control module is used for transmitting in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell and transmitting in the uplink direction of the cell by using the primary subband of the cell.

Optionally, the subband setting module is configured to determine a primary subband and a secondary subband of the cell by:

Optionally, the transmission control module is configured to transmit in a downlink direction of a cell using a primary subband and/or a secondary subband of the cell in the following manner:

Optionally, the transmission control module is configured to transmit in a downlink direction of the cell using the primary subband and/or the secondary subband of the cell, and transmit in an uplink direction of the cell using the primary subband of the cell by using the following method:

Optionally, the transmission control module is configured to determine an interference situation of cross-link interference between the target cell and the neighboring cell by using the following method, and perform coordination processing for reducing interference between the target cell and the neighboring cell by interacting the interference situation:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

Optionally, the method includes determining an interference situation of cross-link interference between a target cell and an adjacent cell by using a transmission control module, and performing coordination processing for reducing interference by interacting the interference situation between the target cell and the adjacent cell, where the coordination processing includes:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

the target cell reduces downlink transmission power;

the neighbor cell of the target cell increases the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

Optionally, the transmission control module is configured to determine an interference situation of cross-link interference between the target cell and the neighboring cell by:

the base station of the target cell and/or the adjacent cell acquires measurement quantity for characterizing cross-link interference level, wherein the measurement quantity comprises at least one of the following measurement quantities:

Optionally, the transmission control module is configured to interact the interference situation between the target cell and the neighboring cell in the following manner:

The embodiment of the invention also provides a method for eliminating interference, which comprises the following steps:

a base station acquires a measurement quantity for measuring a cross-link interference level;

and the base station and the adjacent cell base station interact the measurement quantity for measuring the cross-link interference level.

Optionally, the measurement quantity comprises at least one of the following measurement quantities:

Optionally, among the measurement quantities obtained by the base station, the measurement quantities measured by the user equipment UE and fed back to the base station include at least one of the following:

Optionally, the interacting, between the base station and the neighboring cell base station, of the measurement quantity for measuring the cross-link interference level includes:

the measurement quantity is interacted between the base station and the base station of the adjacent cell in the following way: backhaul link and/or air signaling.

The embodiment of the invention also provides a device for eliminating interference, which is applied to a base station and comprises the following steps:

a measurement quantity acquisition module for acquiring a measurement quantity for measuring a cross-link interference level;

and the measurement quantity interaction module is used for interacting the measurement quantity for measuring the cross-link interference level with the adjacent cell base station.

Optionally, the measurement quantity interacting module is configured to interact the measurement quantity for measuring the cross-link interference level with the neighboring cell base station in the following manner:

and the measurement quantity is interacted with the adjacent cell base station by the following modes: backhaul link and/or air signaling.

Compared with the related art, the method and the device for eliminating the interference provided by the embodiment of the invention determine the primary sub-band and the secondary sub-band of the cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands; and transmitting in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell, and transmitting in the uplink direction of the cell by using the primary subband of the cell. The embodiment of the invention can solve the problem of cross-link interference.

Drawings

Figure 1-a is a schematic diagram of cross-link interference (terminal-to-terminal interference) in the prior art;

1-b is a schematic diagram of cross-link interference (base station to base station interference) in the prior art;

fig. 2 is a flowchart of a method for canceling interference according to embodiment 1 of the present invention;

fig. 3 is a schematic diagram of subband division and power setting of three neighboring cells in example 1 of the present invention;

FIG. 4-1 is a schematic diagram of cross-link interference cancellation (base station to base station) in example 1 of the present invention;

fig. 4-2 is a schematic diagram of cross-link interference (terminal-to-terminal) cancellation in example 1 of the present invention;

fig. 5 is a schematic diagram of an apparatus for canceling interference according to embodiment 2 of the present invention;

fig. 6 is a flowchart of a method for canceling interference according to embodiment 3 of the present invention;

fig. 7 is a schematic diagram of an apparatus for canceling interference according to embodiment 4 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In the description of the embodiment of the present invention, the network side takes the base station (gNB) as an example, and the method applied to the base station may also be applied to deployment devices on the network side, such as a cell (cell), a small cell (small cell), a Transmission and Reception Point (TRP), and an Access Point (AP). The terminal side takes UE (User Equipment) as an example, and the method applied to the UE may also be applied to IOT (Internet of Things) devices, MTC (Machine Type Communication) devices, V2X (Vehicle to Vehicle) devices, and the like.

In the description of the embodiment of the present invention, the interference of uplink/downlink of a cell to downlink of an adjacent cell is equal to the interference of the cell to downlink reception of UE of the adjacent cell, that is, the interfered UE is the UE of the adjacent cell; the interference of uplink/downlink of a cell to uplink of a neighboring cell is equal to the interference of the cell to uplink received by a base station of the neighboring cell, that is, the interfered person is the base station of the neighboring cell.

Example 1

As shown in fig. 2, an embodiment of the present invention provides a method for eliminating interference, including:

step S210, determining the primary and secondary subbands of the cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands;

step S220, transmitting in the downlink direction of the cell by using the primary sub-band and/or the secondary sub-band of the cell, and transmitting in the uplink direction of the cell by using the primary sub-band of the cell;

in this embodiment, the determining the primary subband and the secondary subband of the cell includes:

determining the number and extent of subbands: dividing a system bandwidth (or a carrier bandwidth) into a plurality of sub-bands, wherein each sub-band comprises one or more Resource Blocks (RB), and any two sub-bands are not crossed and overlapped with each other;

wherein, each RB in one sub-band is continuous or discontinuous; the number of RBs contained in different sub-bands is the same or different;

the primary sub-band of a cell is a sub-band, and the secondary sub-band of the cell is a sub-band other than the primary sub-band on the system bandwidth or carrier bandwidth of the cell; for example, the sub-bands of a cell are divided into: a primary sub-band 1, a secondary sub-band 2, … and a secondary sub-band n;

in this embodiment, the number and range of subbands may be determined in any one of the following manners: determined by the protocol; uniformly determining by a base station or a macro cell; determining by mutual coordination between adjacent cells;

in this embodiment, determining the primary subband and the secondary subband of the cell may be performed in any one of the following manners:

determined by the protocol; uniformly determining by a base station or a macro cell; determining by mutual coordination between adjacent cells;

the method for determining the number and the range of the sub-bands and the main sub-band and the auxiliary sub-band of the cell comprises the following steps of a-c:

a) pre-determining the number and range of sub-bands;

for example, the operator/protocol/base station divides the system bandwidth into three sub-bands in advance, but it is not limited which of the three sub-bands is the primary sub-band for a particular cell. The primary sub-band can be subsequently determined by mutual coordination between adjacent cells;

b) the method comprises the steps of predetermining the number and range of sub-bands, and a main sub-band and an auxiliary sub-band of a cell;

for example, the operator/protocol/base station divides the system bandwidth into three sub-bands in advance: subband 1, subband 2, subband 3. A cell 1 uses a sub-band 1 as a main sub-band, a cell 2 uses a sub-band 2 as a main sub-band, and a cell 3 uses a sub-band 3 as a main sub-band;

c) the number and range of sub-bands, and the main sub-band and the auxiliary sub-band of a cell are determined by the mutual coordination between adjacent cells;

in this embodiment, the transmitting in the downlink direction of the cell using the primary subband and/or the secondary subband of the cell includes:

downlink communication from a base station to cell edge UE is sent by using a main sub-band, and the sending power is greater than or equal to a high-power threshold;

The following specifically describes the sub-band and power used by the uplink or downlink of the cell:

downlink communication from the base station to the cell center UE can be sent by using the main sub-band and/or the auxiliary sub-band, and downlink communication from the base station to the cell edge UE is sent by preferentially using the main sub-band; uplink communication of the intra-cell UE (including cell center UE and cell edge UE) is transmitted by using the primary sub-band preferentially.

Wherein, guard bandwidth can be set between sub-bands according to requirement to prevent adjacent channel interference. In general, for dynamic TDD, DL and UL of the same cell are not transmitted simultaneously, and a guard bandwidth may not be set. There is a need to set the protection bandwidth between different cells, but the protection bandwidth does not need to be too large due to the path loss between cells.

1) And the downlink communication from the base station to the UE at the edge of the cell is transmitted by preferentially using the primary sub-band. At this time, when downlink communication from the base station to the cell edge UE is transmitted on the main subband, it is necessary to transmit at high power or set a high power threshold or a high power range.

High power transmission from a base station to a cell edge UE may cause downlink transmission from the base station to interfere with uplink reception from an adjacent base station (provided that the downlink transmission and the uplink transmission use the same frequency band).

The downlink transmission power needs to cover the edge UE and ensure the performance of the edge UE. Here, the preferential use of the primary subband transmission encompasses several meanings:

1. downlink communication from a base station to cell edge UE can be sent only by using a master sub-band; or

2. And the downlink communication from the base station to the UE at the edge of the cell is transmitted by preferentially using the primary sub-band. When the load is light or the number of edge UEs is small, the UE is preferably sent on the main sub-band; when the load is too heavy, or the number of edge UEs is large, and the DL communication requirement is large, the transmission is preferentially carried out on the main sub-band, and then the transmission is carried out by using other auxiliary sub-bands; or

3. The downlink communication from the base station to the cell edge UE may use the primary subband or the secondary subband. When the adjacent base station needs to send DL/UL, especially UL, is sensed or known according to the mutual information, only the downlink transmission is carried out on the main sub-band.

2) Downlink communication from the base station to the cell center UE may be transmitted using the primary subband and/or the secondary subband. At this time, when downlink communication from the base station to the cell center UE is transmitted on the secondary sub-band, it is necessary to transmit at low power, or set a low power threshold or a low power range; when downlink communication from the base station to the cell center UE is transmitted on the main subband, the power is not limited to high power or low power. Preferably, it is desirable to transmit at low power, or to set a low power threshold or range.

Here, "low power/low power threshold/low power range" is a "high power/high power threshold/high power range" with respect to downlink communications from the base station to the cell-edge UE.

For example, the downlink power of the cell edge UE is set to power a, and the downlink power of the cell center UE is set to power B. The setting of the power B needs to satisfy: r1 ═ B/a is less than or equal to a first preset threshold a (0< a < 1). Thus, the setting of power B follows a "low power/low power threshold/low power range"; alternatively, the setting of power a needs to satisfy: and R2 is larger than or equal to a second preset threshold B (B > 1). Thus, the setting of power a follows the "high power/high power threshold/high power range". In addition, it is obvious that a cannot be greater than the maximum downlink transmit power of the cell.

In addition, the transmission on the primary subband and/or the secondary subband as described herein does not mean that each UE's DL scheduling needs to cover both subbands, or only select one subband. Rather, both the primary and secondary subbands (i.e., full bandwidth) may be used for transmission by a cell-centric UE, and the specific subband/subbands and even the specific RB may depend on the channel condition, block size, or scheduling condition of the UE.

3) And the uplink communication of the UE in the cell is transmitted by preferentially using the main sub-band. In this case, when the UE in the cell transmits uplink on the primary subband, there is no restriction on the uplink transmission power of the UE. That is, the uplink power of the UE still depends on the uplink power control algorithm of the UE (e.g., scheduling block size, path loss, open loop, etc.), but may not be affected by the subband attributes (primary subband, secondary subband).

Here, the priority of uplink communication of UEs in a cell using the primary sub-band includes several meanings:

1. uplink communication of UE in a cell can be transmitted only by using a main sub-band; or

2. And the uplink communication of the UE in the cell is transmitted by preferentially using the main sub-band. When the load is light, the number of the UE in the cell is small, and the UE is preferably sent on the main subband; when the load is too heavy, or the number of UE in a cell is large, and the UL communication requirement is large, the transmission is preferentially carried out on the main sub-band, and then the transmission is carried out by using other auxiliary sub-bands; or

3. Uplink communication of the UE in the cell may use the primary subband or the secondary subband. When the adjacent base station needs to send DL/UL, especially DL, is sensed or known according to the mutual information, only downlink transmission is carried out on the main sub-band.

In this embodiment, the transmitting in the downlink direction of the cell using the primary subband and/or the secondary subband of the cell, and the transmitting in the uplink direction of the cell using the primary subband of the cell includes:

determining the interference situation of cross-link interference between a target cell and an adjacent cell, interacting the interference situation between the target cell and the adjacent cell and performing coordination processing for reducing interference: determining uplink or downlink transmission sub-bands and/or transmission power of the target cell and the adjacent cell;

in this embodiment, the determining an interference situation of cross-link interference between a target cell and an adjacent cell, and performing coordination processing to reduce interference by interacting the interference situation between the target cell and the adjacent cell includes:

when an interference level indication (such as a CLI-UL-OI (CLI-Uplink-overload indicator)) of downlink interference of a neighbor cell received in an Uplink direction of a target cell is high interference or exceeds a preset first threshold, performing at least one of the following processes:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

the edge region downlink of the adjacent cell of the target cell uses a main sub-band to transmit;

the CLI-UL-OI is used for representing the cross-link interference level suffered by the uplink of one cell, and the interference of the downlink of the adjacent cell to the uplink of the cell is measured by the interfered cell (base station), belonging to the coordination after interference. Further, the CLI-UL-OI characterizes a measure of the interference level of the neighbor cell downlink channel experienced by each RB or each subband of the uplink bandwidth. The CLI-UL-OI can be divided into three levels of high interference, medium interference and low interference; or the interference level is divided into a high interference level and a low interference level. CLI-UL-OI is measured by the interfered cell (base station) and informed to the neighbor cells, which are expected to give coordination. The notification may be via a backhaul link (e.g., X2 interface or proprietary interface), or via an Air interface (e.g., OTA signaling). The concept of the sub-band may be the same as or different from the concept of the primary or secondary sub-bands described above. For example, another division is used, e.g., several RBs are set as one subband, independent of the concept of primary or secondary subbands.

For example, the uplink and downlink transmissions of the target cell and its neighboring cells use full bandwidth transmission in the beginning. And the target cell acquires the cross-link interference condition of the downlink of the adjacent cell to the uplink of the target cell through the measurement of the CLI-UL-OI. If the CLI-UL-OI is high in interference or exceeds a preset threshold, the target cell uses the main sub-band of the target cell to perform Uplink (UL) transmission, and feeds back the result of the CLI-UL-OI or the use condition of the sub-band to the adjacent cell, and the adjacent cell uses the main sub-band of the adjacent cell to perform Downlink (DL) transmission to the edge UE. Therefore, the cross-link interference of the downlink of the adjacent cell to the uplink of the target cell is reduced.

when an interference level indication (such as a CLI-UL-high-interference indicator (CLI-Uplink-high-interference indicator)) of interference in an Uplink direction of a target cell to a downlink direction of a neighboring cell is high interference or exceeds a preset second threshold, at least one of the following processes is performed:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

the CLI-UL-HII is used for representing the possible interference level of uplink of a cell to downlink of an adjacent cell, and the interference of UL-to-DL (uplink of the cell to downlink of the adjacent cell) is measured by the cell causing the interference, belonging to pre-coordination before interference. Further, CLI-UL-HII characterizes the possible interference level of the UE to the neighbor cell downlink to be scheduled for the entire uplink bandwidth of the cell. The CLI-UL-HII can be divided into three levels of high interference, medium interference and low interference; or the interference level is divided into a high interference level and a low interference level. CLI-UL-HII is measured by the interfering cell (base station) and informed to the neighbor cells, which are expected to give coordination. The notification may be via a backhaul link (e.g., X2 interface or proprietary interface), or via an Air interface (e.g., OTA signaling). One value for each RB or each subband. The concept of the sub-band may be the same as or different from the concept of the primary or secondary sub-bands described above. For example, another division is used, e.g., several RBs are set as one subband, independent of the concept of primary or secondary subbands.

For example, the uplink and downlink transmissions of the target cell and its neighboring cells use full bandwidth transmission in the beginning. And the target cell acquires the cross-link interference situation of the uplink of the target cell on the downlink of the adjacent cell through measurement of CLI-UL-HII. If the CLI-UL-HII is high interference or exceeds a preset threshold, the target cell uses the main sub-band of the target cell to carry out Uplink (UL) transmission, and feeds back the CLI-UL-HII result or the sub-band use condition to the adjacent cell, and the adjacent cell uses the main sub-band of the adjacent cell to carry out Downlink (DL) transmission to the edge UE. Therefore, the cross-link interference of the target cell uplink to the neighbor cell downlink is reduced.

when an interference level indicator of uplink interference of a neighboring cell (such as a CLI-DL-OI (CLI-Downlink-overload indicator)) received in a Downlink direction of a target cell is high interference or exceeds a preset third threshold, at least one of the following processes is performed:

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

the adjacent cell uplink of the target cell uses a main sub-band to transmit;

the CLI-DL-OI is used for representing the cross-link interference level suffered by the downlink of one cell, and the interfered cell measures the interference of UL-to-DL (the uplink of the adjacent cell is opposite to the downlink of the cell), belonging to post-interference coordination. The CLI-DL-OI characterizes a measure of the interference level of the neighbor cell uplink channel experienced by each RB or each subband of the downlink bandwidth. The CLI-DL-OI can be divided into three levels of high interference, medium interference and low interference; or the interference level is divided into a high interference level and a low interference level. The CLI-DL-OI is measured by the interfered cell (base station or UE, preferably UE), and if it is UE, the UE needs to feed back the measurement amount to the base station. Further, the neighbor cells may be informed by the base station, which is expected to give coordination. The notification may be via a backhaul link (e.g., X2 interface or proprietary interface), or via an Air interface (e.g., OTA signaling). The concept of the sub-band may be the same as or different from the concept of the primary or secondary sub-bands described above. For example, another division is used, e.g., several RBs are set as one subband, independent of the concept of primary or secondary subbands.

when an interference level indicator (such as a CLI-DL-HII (CLI-Downlink-high-interference indicator)) of interference in a Downlink direction of the target cell to an uplink direction of the neighboring cell is high interference or exceeds a preset fourth threshold, performing at least one of the following processes:

the target cell reduces downlink transmission power; or

The neighbor cell of the target cell increases the uplink transmission power; or

The target cell downlink uses a master sub-band to transmit; or

The edge region downlink of the target cell is transmitted by using a master sub-band; or

The adjacent cell uplink of the target cell uses a main sub-band to transmit;

the CLI-DL-HII is used for representing the possible interference level of one cell downlink to the adjacent cell uplink, and the interference of DL-to-UL (the cell downlink to the adjacent cell uplink) is measured by the cell causing the interference, belonging to pre-coordination before interference. CLI-DL-HII characterizes the possible interference level of the UE whose entire bandwidth of the cell downlink is to be scheduled to the neighbor cell uplink. The CLI-DL-HII can be divided into three levels of high interference, medium interference and low interference; or the interference level is divided into a high interference level and a low interference level. CLI-DL-HII is measured by the cell (base station) causing the interference and informed to the neighbor cells, which are expected to give coordination. The notification may be via a backhaul link (e.g., X2 interface or proprietary interface), or via an Air interface (e.g., OTA signaling). One value for each RB or each subband. The concept of the sub-band may be the same as or different from the concept of the primary or secondary sub-bands described above. For example, another division is used, e.g., several RBs are set as one subband, independent of the concept of primary or secondary subbands.

Furthermore, the interference level indicator for characterizing the interference of the downlink direction of the target cell to the uplink direction of the neighbor cell may also use a CLI-DL-RNTP (CLI-DL-Relative Narrowband TX Power) indicator. CLI-DL-RNTP characterizes the power level of each RB of the full bandwidth to be scheduled by downlink;

the interference level indicator for characterizing the interference of the uplink direction of the target cell to the downlink direction of the neighbor cell may also use a CLI-UL-RNTP (CLI-UL-Relative Narrowband TX Power) indicator. The CLI-UL-RNTP characterizes the power level of each RB of the full bandwidth to be scheduled by uplink;

in addition, when performing interference coordination between the target cell and the neighboring cell, a CLI-Reference Signal Receiving Power (CLI-Reference Signal Receiving Power) index may be used, where the CLI-RSRP index is used to determine an interference situation or a path loss between two UEs, or is used to determine an interference situation or a path loss between two base stations. Similar to RSRP used in LTE (for determining large scale channel conditions or path loss between a base station and a UE), the same noun or terminology may be used, but CLI-RSRP herein may be further subdivided into CLI-RSRP-gNB, which is mainly used for RSRP measurement between a base station and a UE, and CLI-RSRP-UE, which is used for RSRP measurement between a UE and a UE.

In this embodiment, the determining the interference situation of the cross-link interference between the target cell and the neighboring cell includes: the base station of the target cell and/or the adjacent cell acquires measurement quantity for characterizing cross-link interference level, wherein the measurement quantity comprises at least one of the following measurement quantities:

measurements used to characterize the reference signal received power level between the cell user equipment UE and the neighbor cell UE: cross-link interference-reference signal received power-user equipment CLI-RSRP-UE;

in this embodiment, the interacting the interference between the target cell and the neighboring cell includes:

the measurement quantity is interacted between the base stations of the target cell and/or the adjacent cell in the following modes: a backhaul link and/or air interface signaling;

wherein the backhaul link comprises: an X2 interface or a proprietary interface.

In this embodiment, among the measurement quantities obtained by the base station, the measurement quantities measured by the user equipment UE and fed back to the base station include at least one of the following:

the method of canceling interference according to the present embodiment is described below using an example (example 1).

Assuming a carrier bandwidth of 20MHz and a subcarrier spacing of 15kHz, 100 RBs may be included. When cross-link interference cancellation is performed between two adjacent cells, 100 RBs may be divided into two sub-bands. In this case, it is preferable that different sub-bands have the same size. For example, subband 1 and subband 2 each contain 50 RBs, and the two subbands are equal in size. The primary subband of cell 1 is subband 1 and the secondary subband is subband 2. The primary subband of cell 2 is subband 2 and the secondary subband is subband 1.

When cross-link interference cancellation is performed between three adjacent cells, 100 RBs may be divided into three sub-bands. Sub-band 1, sub-band 2, and sub-band 3 contain 33, 34 RBs, respectively. The three subbands are of different sizes. The primary subband of cell 1 is subband 1, and the secondary subbands are subband 2 and subband 3. The primary subband of cell 2 is subband 2, and the secondary subbands are subband 1 and subband 3. The primary subband of cell 3 is subband 2, and the secondary subbands are subband 1 and subband 3.

As shown in fig. 3, the transmission power of three cells on different subbands has the following characteristics: the transmission is performed with high power on the primary subband and with low power on the secondary subband. Specifically, the DL of the cell 1 edge UE uses subband 1 (high power threshold, which is the primary subband of cell 1); DL of cell 1 center UE uses all sub-band 1/2/3 (low power threshold); the UL of both the edge UE and the center UE of cell 1 use subband 1 (power setting is not required, and is determined according to uplink power control).

The DL of the neighboring cell edge UE uses a different sub-band from sub-band 1, e.g., sub-band 2 (high power threshold, which is the primary sub-band of cell 2); the neighbor cell center UE may use the full sub-band (sub-band 1/2/3) but the power threshold is low. The UL of both the edge UE and the center UE of the neighboring cell use subband 2 (power setting is not required, and is determined according to uplink power control).

As shown in fig. 4-1, the gNB1 of cell 1 transmits DL to the cell center UE, which is transmitted at low power in sub-band 1/2/3, and the coverage area is within the dashed box, which cannot reach the gNB2 of cell 2, and therefore cannot cause CLI to UL of the gNB2, or the CLI can be ignored. Therefore, cross-link interference of the base station to the base station is eliminated.

The gNB1 transmits DL to cell-edge UEs, which are transmitted with high power in subband 1, and the coverage is within the solid line box and can reach the gNB 2. Since UE UL of gNB2 is transmitted using sub-band 2, DL of gNB1 does not cause CLI for all UL of gNB2 at this time. Therefore, cross-link interference of the base station to the base station is eliminated.

As shown in fig. 4-2, the gNB1 cell center UE transmits UL to the gNB1, and transmits with power set by uplink power control in subband 1. The UL transmission by the cell-centric UE generally does not cause CLI, or negligible CLI, to the DL of the neighbor-centric UE (sub-band 1/2/3) and the neighbor-edge UE (sub-band 2). The former is due to the far distance between the center of cell 1 and the center of cell 2, and the UL transmit power of the cell center UE is generally low. The latter is mainly due to the different subbands used.

And the gNB1 cell edge UE transmits UL to the gNB1, and transmits the UL according to the power set by the uplink power control in the subband 1. The UE UL at the cell edge generally does not cause CLI, or is negligible, to the DL at the neighbor cell center UE (sub-band 1/2/3) and the neighbor cell edge UE (sub-band 2). The former is due to the edge of cell 1 being further from the center of cell 2. The latter is mainly due to the different subbands used.

Example 2

As shown in fig. 5, an embodiment of the present invention provides an apparatus for eliminating interference, including:

a subband setting module 501, configured to determine a primary subband and a secondary subband of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands;

a transmission control module 502, configured to use the primary subband and/or the secondary subband of the cell for transmission in a downlink direction of the cell, and use the primary subband of the cell for transmission in an uplink direction of the cell.

In this embodiment, the subband setting module is configured to determine a primary subband and a secondary subband of a cell in the following manner:

In this embodiment, the transmission control module is configured to transmit in the downlink direction of a cell using a primary subband and/or a secondary subband of the cell in the following manner:

In this embodiment, the transmission control module is configured to transmit in the downlink direction of the cell using the primary subband and/or the secondary subband of the cell, and transmit in the uplink direction of the cell using the primary subband of the cell by using the following method:

In this embodiment, the transmission control module is configured to determine an interference situation of cross-link interference between a target cell and an adjacent cell by using the following method, and perform coordination processing for reducing interference between the target cell and the adjacent cell by interacting the interference situation:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

In this embodiment, a transmission control module, configured to determine an interference situation of cross-link interference between a target cell and an adjacent cell in the following manner, where the interference situation is interacted between the target cell and the adjacent cell and a coordination process for reducing interference is performed, includes:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

the target cell reduces downlink transmission power;

the neighbor cell of the target cell increases the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

In this embodiment, the transmission control module is configured to determine an interference situation of cross-link interference between the target cell and the neighboring cell by:

in this embodiment, the transmission control module is configured to interact the interference situation between the target cell and the neighboring cell in the following manner:

example 3

As shown in fig. 6, an embodiment of the present invention provides a method for eliminating interference, including:

s610, the base station obtains a measurement quantity for measuring the cross-link interference level;

s620, the base station and the adjacent cell base station interact the measurement quantity for measuring the cross-link interference level.

In this embodiment, the measurement amount includes at least one of the following measurement amounts:

In this embodiment, the interacting between the base station and the neighboring cell base station of the measurement quantity for measuring the cross-link interference level includes:

In this embodiment, the base station acquires the measurement result of the measurement quantity and interacts with the neighboring base station to obtain the measurement result of the measurement quantity, and on one hand, the base station may adjust its own transmission policy (for example, increase/decrease power, or change transmission sub-band, etc.) according to the measurement result of the measurement quantity to reduce the influence of the neighboring cell on the neighboring cell or reduce the cross-link interference of the neighboring cell caused by the neighboring cell. On the other hand, the neighboring base station may adjust a transmission policy (for example, increase/decrease power, or schedule, or change a transmission subband, etc.) of the neighboring base station according to the obtained measurement result of the measurement quantity by the base station, and may also reduce cross-link interference of the neighboring cell to the cell, or reduce the influence of interference of the neighboring cell on the cell. That is, the measurement of the measurement quantity by the base station and the interaction between the base stations effectively reduce the influence of the cross-link interference on the system performance, and improve the performance of the dynamic TDD system or the similar system.

As shown in fig. 7, an apparatus for eliminating interference according to an embodiment of the present invention is applied to a base station, and includes:

a measurement quantity obtaining module 701, configured to obtain a measurement quantity for measuring a cross-link interference level;

a measurement quantity interacting module 702, configured to interact the measurement quantity for measuring the cross-link interference level with a neighboring cell base station.

In this embodiment, the measurement quantity interacting module is configured to interact the measurement quantity for measuring the cross-link interference level with the neighboring cell base station in the following manner:

It should be noted that the present invention can be embodied in other specific forms, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A method of cancelling interference, comprising:

determining a primary sub-band and a secondary sub-band of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands; determining the number and extent of the sub-bands by at least one of: determining a protocol, uniformly determining a macro cell and mutually coordinating and determining adjacent cells;

transmitting in a downlink direction of a cell by using a primary subband and/or a secondary subband of the cell, and transmitting in an uplink direction of the cell by using the primary subband of the cell;

wherein, the transmitting in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell and the transmitting in the uplink direction of the cell by using the primary subband of the cell comprises:

determining the interference situation of cross-link interference between a target cell and an adjacent cell, interacting the interference situation between the target cell and the adjacent cell and performing coordination processing for reducing interference: determining uplink or downlink sending sub-bands and sending power of the target cell and the adjacent cell, or determining uplink or downlink sending sub-bands of the target cell and the adjacent cell;

performing at least one of the following processes according to the interference situation of the cross-link interference: changing the transmission power of the target cell; changing the transmission power of the neighbor cell of the target cell.

2. The method of claim 1, wherein:

the determining the primary sub-band and the secondary sub-band of the cell includes:

3. The method of claim 1 or 2, wherein:

the sending in the downlink direction of the cell by using the primary subband and/or the secondary subband of the cell includes:

4. The method of claim 1, wherein:

the determining an interference situation of cross-link interference between a target cell and an adjacent cell, interacting the interference situation between the target cell and the adjacent cell, and performing coordination processing to reduce interference includes:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

5. The method of claim 1, wherein:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

6. The method of claim 1, wherein:

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

7. The method of claim 1, wherein:

the target cell reduces downlink transmission power;

the neighbor cell of the target cell increases the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

8. The method of claim 1, wherein:

the determining the interference situation of the cross-link interference between the target cell and the neighbor cell includes: the base station of the target cell and/or the adjacent cell acquires measurement quantity for characterizing cross-link interference level, wherein the measurement quantity comprises at least one of the following measurement quantities:

9. The method of claim 8, wherein:

the interacting the interference situation between the target cell and the neighboring cell includes:

10. An apparatus for canceling interference, comprising:

a subband setting module, configured to determine a primary subband and a secondary subband of a cell: setting a main sub-band and an auxiliary sub-band of a cell as different sub-bands, and setting the main sub-band of the cell and the main sub-band of a cell adjacent to the cell as different sub-bands; determining the number and extent of the sub-bands by at least one of: determining a protocol, uniformly determining a base station, uniformly determining a macro cell and mutually coordinating and determining adjacent cells;

a transmission control module, configured to send in a downlink direction of a cell using a primary subband and/or a secondary subband of the cell, and send in an uplink direction of the cell using the primary subband of the cell;

a transmission control module, configured to transmit in a downlink direction of a cell using a primary subband and/or a secondary subband of the cell and transmit in an uplink direction of the cell using the primary subband of the cell by using the following method:

11. The apparatus of claim 10, wherein:

a subband setting module, configured to determine a primary subband and a secondary subband of a cell in the following manner:

12. The apparatus of claim 10 or 11, wherein:

a transmission control module, configured to send using the primary subband and/or the secondary subband of the cell in the downlink direction of the cell in the following manner:

13. The apparatus of claim 10, wherein:

a transmission control module, configured to determine an interference situation of cross-link interference between a target cell and an adjacent cell in the following manner, and perform coordination processing for reducing interference between the target cell and the adjacent cell, where the interference situation is interacted between the target cell and the adjacent cell:

the target cell increases uplink transmission power;

the neighbor cell of the target cell reduces the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

14. The apparatus of claim 10, wherein:

a transmission control module, configured to determine an interference situation of cross-link interference between a target cell and an adjacent cell in the following manner, and perform coordination processing for reducing interference by interacting the interference situation between the target cell and the adjacent cell, where the coordination processing includes:

the target cell reduces uplink transmission power;

the neighbor cell of the target cell increases the downlink transmission power;

the target cell uplink uses a master sub-band to transmit;

15. The apparatus of claim 10, wherein:

the target cell increases downlink transmission power;

the neighbor cell of the target cell reduces the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

16. The apparatus of claim 10, wherein:

the target cell reduces downlink transmission power;

the neighbor cell of the target cell increases the uplink transmission power;

the target cell downlink uses a master sub-band to transmit;

17. The apparatus of claim 10, wherein:

a transmission control module, configured to determine an interference situation of cross-link interference between a target cell and an adjacent cell by using the following method:

18. The apparatus of claim 10, wherein:

a transmission control module, configured to interact the interference situation between the target cell and the neighboring cell in the following manner: