WO2017036306A1 - Method and device for uplink and downlink interference coordination - Google Patents

Abstract

Disclosed are a method and a device for uplink and downlink interference coordination. The method comprises: proportioning uplink subframe format and downlink subframe format to be transmitted between a first network side and a second network side, the second network side being a neighboring network on the same band or an adjacent band of the first network side, said first network side supporting full downlink subframe transmission, said first network side determining, according to the proportioning of the uplink subframe format and downlink subframe format on said second network side, whether to initiate a mechanism of avoiding a downlink-to-uplink interference. This solves the problem of how to perform interference coordination for network sides of an adjacent band and of the same band supporting full downlink subframe format and network sides of only supporting current TDD subframe format, effectively achieving the downlink-to-uplink interference coordination on different network sides.

Description

Method and device for processing uplink and downlink interference coordination Technical field

The present application relates to, but is not limited to, the field of communications, and in particular, to a method and apparatus for processing uplink and downlink interference coordination.

Background technique

The time division duplex (TDD) network side is divided into uplink (user equipment (UE) to Evolved Node Base station (eNB)) and downlink (transmitted by the base station to the user terminal) in the time domain. Resources, and the allocation of uplink and downlink resources is usually performed in units of time slots or subframes. In general, the base station notifies all user terminals (User Equipment, UE) in the cell by using the broadcast network side information (SI) in a semi-static manner.

The uplink and downlink configuration mode of the Long Term Evolution (LTE) network side TDD mode is shown in Table 1. Wherein D represents a downlink subframe for transmitting a downlink signal, U represents an uplink subframe for transmitting an uplink signal, and S represents a special subframe and includes three special time slots, that is, a downlink pilot time slot (Downlink Pilot Time Slot) , DwPTS, for downlink transmission), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS for uplink transmission).

Table 1

According to Table 1, in the LTE-TDD network side, when different cells adopt different TDD uplink and downlink configuration modes, uplink to downlink interference, uplink to uplink interference, downlink to uplink interference, and downlink to downlink interference may occur. The uplink-to-downlink interference refers to that the terminal receives the uplink signal sent by the neighboring cell terminal to the base station, that is, the UE-to-UE interference, and the uplink-to-uplink interference refers to the base station transmitting the terminal in the receiving cell. The uplink signal also receives the uplink signal sent by the neighboring cell terminal to the base station, that is, the UE-to-eNB interference; the downlink to the uplink interference refers to the base station transmitting the uplink signal to the neighboring cell terminal and receiving the neighboring cell base station to send the uplink signal to the terminal. The downlink signal, that is, the eNB-to-eNB interference, is that the terminal receives the downlink signal from the base station and receives the downlink signal sent by the neighboring cell base station to the terminal, that is, the eNB-to-UE interference.

Among them, uplink to downlink interference and uplink to uplink interference, compared with downlink to downlink interference and downlink to uplink interference, because the uplink power control mechanism causes the terminal transmit power to be lower than the base station transmit power, so the uplink interference is caused. The performance degradation on the network side is far less than that caused by downlink interference. At the same time, the downlink-to-downlink interference is compared to the downlink-to-uplink interference, because if the base station base station has higher transmit power and the adjacent channel base station's adjacent channel interference power ratio mechanism acts, the eNB-to-UE interference is also caused. The resulting network side performance degradation is far less than that caused by eNB-to-eNB interference.

And with the discussion of 5G communication in recent years, the future data services will be mainly distributed indoors and hotspots. In this context, the concept of ultra dense network (UDN) has emerged. UDN increases network capacity by increasing the deployment density of Low Power Nodes (LPNs). However, as the density of low-power nodes increases, the distance between nodes is shortened. The problem of uplink and downlink interference in the LTE-TDD network side is more serious, especially the interference of the downlink transmission node to the uplink transmission node, that is, the eNB-to-eNB interference The distance between the nodes is extremely shortened, so that the signal to interference and noise ratio (SINR) of the neighboring base station terminal is significantly deteriorated, resulting in deterioration of the performance of the uplink transmission terminal of the node.

Based on the above analysis, because the base station has higher transmit power, the downlink interference generated by the downlink transmission of the cell is relatively higher, which may cause the performance of the uplink transmission terminal of other cells to deteriorate seriously, and as the base station transmits power increases and the distance between nodes decreases, Even the uplink communication is not possible. Therefore, the uplink-to-uplink interference is the most in need of the interference coordination technology to adjust the performance of the network side among the above four types of interference, and it is necessary to perform interference coordination enhancement for the characteristics of the eNB-to-eNB interference.

In the related art, the coordination techniques for uplink and downlink interference caused by different TDD uplink and downlink subframe formats between different base stations in the same network side are mainly: uplink and downlink configuration information and interference overload indication information between base stations, so that the base station can Coordinating uplink and downlink configurations, such as adjusting to the same subframe format, to avoid serious eNB-to-eNB interference; or, the eNB may also adjust its downlink data transmission power to reduce interference generated in certain subframes; The interfering cell base station uses a higher uplink transmit power to overcome the downlink interference of the interfering cell base station.

However, the related technologies are not considered much for the uplink and downlink interference problems in the adjacent frequency bands and the different network sides in the same frequency band. Especially for the R13 phase, in order to make full use of the less used TDD spectrum, and to solve the increasingly fierce frequency division duplex (FDD) spectrum, the 3rd Generation Partnership Project (The 3rd Generation Partnership Project, The 3GPP) organization proposes to introduce a new subframe format in TDD as shown in Table 2, that is, a subframe format in which all radio frames are downlink subframes, similar to downlink FDD. Then, when the network side that introduces the new subframe format introduces the downlink-to-uplink interference brought by the network side of the existing TDD subframe format, how to coordinate, and when the network side supporting the full downlink subframe format is a macro base station, the transmission power is compared. Large, it may cause the uplink terminal throughput on the neighboring network side to drop sharply to zero, so the downlink to uplink interference is an urgent problem to be solved. However, before the interference coordination is resolved, it is also necessary to consider how the other party's subframe format is known between different network sides. If the other party's subframe format is known, what kind of interference coordination technology is used to make the adjacent frequency band when the neighboring base station is an uplink subframe. And the network side supporting the full downlink subframe format of the same frequency band and the network side supporting only the existing TDD subframe format. In the related art, there is no better solution mechanism for the above problems.

Table 2

For the related art, there is no effective solution for the problem of how the adjacent-band and the same-band supporting the full-downstream subframe format network side and the network side supporting only the existing TDD subframe format interfere with coordination.

Summary of the invention

The following is an overview of the topics detailed in this document. This summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a processing method and device for uplink and downlink interference coordination.

In one aspect, a method for processing uplink and downlink interference coordination is provided, including:

The uplink subframe and the downlink subframe format transmitted between the first network side and the second network side are matched, wherein the second network side is a neighboring frequency band of the first network side or a neighboring network of the same frequency band, The first network side supports full downlink subframe transmission;

The first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side.

The ratio of the format of the uplink subframe and the downlink subframe between the first network side and the second network side includes:

The user terminal on the first network side scans different subframes of the second network side base station, and the user equipment on the first network side measures cell reference signals of the different subframes of the second network side base station ( a Received Signal Strength Indication (RSSI) of the Cell Reference Signal (CRS), determining a subframe format of the different subframe according to the RSSI, or decoding, by the user terminal on the first network side, the second network side a physical broadcast channel (PBCH) time division duplex TDD configuration information, and determining a subframe format of the different subframe according to the PBCH TDD configuration information, where the subframe format includes: an uplink subframe, and a downlink subframe ;

The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframes on the second network side.

The determining, according to the RSSI, the subframe format of the different subframes includes:

The user terminal on the first network side obtains synchronization with the base station on the second network side in frequency and symbol according to a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS). Obtaining a physical-layer cell identity (PCI) of the second network side base station;

Obtaining, according to the PCI, a time-frequency location of the cell reference signal CRS of the second network-side base station, where the CRS pattern time-frequency location is in one-to-one correspondence with the PCI;

The user terminal on the first network side measures the RSSI of the CRS on the second network side at a current time;

Performing a correlation operation according to the RSSI and the CRS to obtain a signal strength peak;

Determining that the current subframe of the second network side base station is a downlink subframe, where the signal strength peak is greater than a preset threshold;

Determining that the current subframe of the second network side base station is an uplink subframe, where the signal strength peak is less than a preset threshold;

The preset threshold is configured by the upper layer, and is sent to the user terminal by the base station to which the user terminal belongs.

The method further includes: before the user terminal on the first network side scans different subframes of the second network side base station, the method further includes:

The user terminal receives the network side notification information sent by the upper layer, and the network side notification information is set to instruct the user terminal on the first network side to scan different subframes of the second network side base station.

The ratio of the format of the uplink subframe and the downlink subframe between the first network side and the second network side includes:

The base station on the first network side scans different subframes of the second network side base station, and the base station on the first network side measures the RSSI of the cell reference signal CRS of the different subframes of the second network side base station Determining, according to the RSSI, the subframe format of the different subframes, or the base station on the first network side decoding the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, according to the PBCH TDD The configuration information is used to determine a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe.

Before the base station on the first network side scans different subframes of the second network side base station, the method includes:

The base station on the first network side configures a measurement protection interval of the user terminal in the base station, where the measurement protection interval indicates that the user terminal scans the base station on the first network side in a time period indicated by the measurement protection interval. Different subframes of the second network side base station.

The ratio of the format of the uplink subframe and the downlink subframe between the first network side and the second network side includes:

The user terminal on the first network side and the base station on the first network side scan different subframes of the second network side base station, the user terminal on the first network side, and the base station on the first network side The RSSI of the CRS of the different subframes of the second network side base station is measured, and the subframe format of the different subframes is determined according to the RSSI;

The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframes on the second network side.

The scanning different subframes of the second network side base station includes one of the following:

Scanning, by the base station corresponding to all carrier frequencies on the second network side;

The base station corresponding to the carrier frequency of the preset number of the second network is scanned, wherein the preset number of carrier frequencies are configured by the upper layer, and are sent to the user terminal by the base station to which the user terminal belongs.

The determining, by the first network side, whether the downlink to uplink interference avoidance mechanism is enabled includes:

After the base station on the first network side acquires the subframe format on the second network side, the base station on the first network side acquires an uplink overload interference indicator (OI) sent by the second operating base station. The OI is used to reflect the interference level of the network side frequency domain dimension, and the second network side measures the OI for different resource blocks of the current uplink subframe, where the value of the OI includes one of the following: strong Interference, normal interference, weak interference;

Adjusting base station transmit power of the first network side according to the OI.

The acquiring, by the base station on the first network side, the uplink overload interference indication OI sent by the second operating base station includes:

When the OI coordinated time arrives, the base station on the first network side acquires the OI fed back by the base station on the second network side.

The adjusting the base station transmission on the first network side includes:

Adjusting a cell reference signal CRS power of the base station on the first network side, where

The subframe format of the first network side is the same as the subframe format of the second network side, and the current CRS transmission power is used;

The subframe format on the first network side is different from the subframe format on the second network side, and the current CRS transmission power is not used at the intersection subframe; the subframe format on the first network side and the first The subframe format of the second network side is different, and the cell reference signal CRS transmission power of the base station on the first network side is reduced at the intersection subframe;

The sub-frame format of the first network side is a sub-frame format of the downlink sub-frame and the sub-frame format of the second network side is an uplink sub-frame.

The method further includes: while adjusting a cell reference signal CRS transmit power of the base station on the first network side, the method further includes:

At the intersection subframe, the base station side base station reduces the cell reference signal CRS transmission power, and when the reference signal received power (RSRP) is measured, the cell reference signal CRS transmission power does not change. ;

At the intersection subframe, the base station side base station reduces the cell reference signal CRS transmission power, and when the user terminal on the first network side selects the access cell, the measured reference signal received power RSRP value is added. An upper offset value, wherein the offset value is notified by the upper layer to the user terminal;

When the base station side base station reduces the cell reference signal CRS transmission power, the user terminal on the first network side does not perform the process of accessing the cell, and does not measure the RSRP.

The adjusting the base station transmit power of the first network side according to the OI includes:

When the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power;

In case the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format.

The modified subframe format includes one of the following:

Modified to a subframe format containing a preset number of downlink transmissions;

Modifying the subframe format of the first network side is the same as the subframe format of the second network side.

After the base station on the first network side modifies the subframe format, the method includes one of the following:

Transmitting the information of the modified subframe format to a central node, where the central node is based on the modified subframe format and the original uplink (UL, uplink)/downlink (DL, downlink) transmission load Determining, in the first network side, an uplink-downlink UL-DL configuration, where the central node sends the result of the configuration to other nodes on the first network side;

Transmitting the new uplink-downlink UL-DL configuration to each node on the first network side, where each node determines whether to modify according to its own uplink-downlink UL-DL configuration and a new subframe configuration. Subframe format.

On the other hand, a processing device for uplink and downlink interference coordination is also provided, including:

a transmission module, configured to match an uplink subframe and a downlink subframe format transmitted between the first network side and the second network side, where the second network side is a neighboring frequency band or a same frequency band of the first network side a neighboring network, where the first network side supports full downlink subframe transmission;

The module is enabled, and the first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side.

The transmission module includes:

a first scanning unit, configured to scan, by the user terminal on the first network side, different subframes of the second network side base station, where the user equipment on the first network side measures different subframes of the second network side base station The RSSI of the CRS determines the subframe format of the different subframes according to the RSSI, or the user terminal of the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, according to Determining, by the PBCH TDD configuration information, a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe;

The first scanning unit is further configured to: the user terminal on the first network side feeds back, to the base station to which the user terminal belongs, the format of the different subframes on the second network side.

The transmission module includes:

a second scanning unit, configured to: the base station on the first network side scans different subframes of the second network side base station, and the base station on the first network side measures CRS of different subframes in the second network side base station The RSSI determines the subframe format of the different subframes according to the RSSI, or the base station of the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, according to the PBCH The TDD configuration information determines a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe.

The transmission module includes:

a third scanning unit, configured to scan the different subframes of the second network side base station, and the user terminal and the first network side user terminal together with the base station on the first network side The base station of the first network side measures the RSSI of the cell reference signal CRS of the different subframes of the second network side base station, and determines the subframe format of the different subframe according to the RSSI;

The third scanning unit is further configured to: the user terminal on the first network side feeds back, to the base station to which the user terminal belongs, the format of the different subframes on the second network side.

The opening module includes:

After the base station of the first network side obtains the subframe format of the second network side, the base station of the first network side acquires an uplink overload interference indication OI sent by the second operating base station, The OI is used to reflect the interference level of the network side frequency domain dimension, and the second network side measures the OI for different resource blocks of the current uplink subframe, where the value of the OI includes one of the following: strong interference Normal interference, weak interference; adjusting base station transmit power of the first network side according to the OI.

The adjustment unit includes:

a power adjustment subunit, configured to: when the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power;

The format adjustment subunit is configured to: when the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format.

In another aspect, embodiments of the present invention provide another computer readable storage medium storing computer executable instructions that are implemented by a processor to implement the above method.

According to the embodiment of the present invention, the uplink subframe and the downlink subframe format transmitted between the first network side and the second network side are matched, wherein the second network side is a neighboring frequency band or a neighboring network of the first network side. The first network side supports the full downlink subframe transmission, and the first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the ratio of the second network-side uplink subframe and the downlink subframe format, and solves the adjacent frequency band and The problem of how to interfere with the coordination of the full-downstream subframe format network side and the network side supporting only the existing TDD subframe format in the same frequency band effectively realizes downlink-to-uplink interference coordination on different network sides.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

In the drawing:

1 is a flowchart of a method for processing uplink and downlink interference coordination according to an embodiment of the present invention;

2 is a structural block diagram of a processing apparatus for uplink and downlink interference coordination according to an embodiment of the present invention;

3 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 1 of the present invention;

4 is a schematic diagram of an OI indication format in a related art according to an embodiment of the present invention;

5 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 2 of the present invention;

6 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 3 of the present invention;

7 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 4 of the present invention;

8 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 5 of the present invention;

9 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 6 of the present invention;

10 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 7 of the present invention;

11 is a schematic diagram of centralized coordination of different base station subframe formats according to a preferred embodiment 10 of the present invention;

FIG. 12 is a schematic diagram of distributed coordination of different base station subframe formats according to a preferred embodiment 11 of the present invention.

Embodiments of the invention

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 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.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a method for processing uplink and downlink interference coordination is provided. FIG. 1 is a flowchart of a method for processing uplink and downlink interference coordination according to an embodiment of the present invention. As shown in FIG. 1 , the process includes the following steps. :

Step S102, the uplink subframe and the downlink subframe format transmitted between the first network side and the second network side are matched, wherein the second network side is a neighboring frequency band of the first network side or a neighboring network of the same frequency band. The first network side supports full downlink subframe transmission;

Step S104: The first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side.

The uplink subframe and the downlink subframe format transmitted between the first network side and the second network side are matched by the foregoing steps, where the second network side is a neighboring frequency band or a neighboring network of the first network side, The first network side supports full downlink subframe transmission, and the first network side determines whether to enable the downlink uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio, and solves the support of the adjacent frequency band and the same frequency band. The downlink side frame format network side and the network side supporting only the existing TDD subframe format interfere with the coordination problem, and effectively implement different downlink-to-uplink interference coordination on the network side.

In the embodiment of the present invention, the first network side may be the network side of the first operator, the second network side may be the network side of the second operator, and the first network side and the second network side may include : Operator, Evolved Base Station (eNB), Multi-cell/Multicast Coordination Entity (MCE), Gateway, Evolved Universal Terrestrial Radio Access Network (EUTRAN), Operation Administration and Maintenance (OAM) Manager.

In this embodiment, the uplink subframe and the downlink subframe format ratio between the first network side and the second network side include:

The user terminal on the first network side scans different subframes of the second network side base station, and the user equipment on the first network side measures the RSSI of the cell reference signal CRS of the different subframe of the second network side base station, according to the The RSSI determines the subframe format of the different subframes, or the user terminal on the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, and determines the different subframe according to the PBCH TDD configuration information. Subframe format, the subframe format includes: an uplink subframe, and a downlink subframe;

The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframe on the second network side.

In this embodiment, determining, according to the RSSI, the subframe format of the different subframe includes:

The user terminal on the first network side obtains the frequency and symbol synchronization with the base station on the second network side according to the primary synchronization signal PSS and/or the secondary synchronization signal SSS, and acquires the physical layer cell identifier PCI of the second network side base station. ;

Obtaining, according to the PCI, a time-frequency location of the cell reference signal CRS of the second network-side base station, where the CRS pattern time-frequency location is in one-to-one correspondence with the PCI;

The user terminal on the first network side measures the received signal strength RSSI of the CRS on the second network side at the current time;

Performing a correlation operation according to the RSSI and the CRS to obtain a signal strength peak;

When the signal strength peak is greater than the preset threshold, determining that the current subframe of the second network side base station is a downlink subframe;

If the signal strength peak is less than the preset threshold, determining that the current subframe of the second network side base station is an uplink subframe;

The preset threshold is configured by the upper layer and sent to the user terminal by the base station to which the user terminal belongs.

In this embodiment, before the user terminal on the first network side scans different subframes of the second network side base station, the user terminal receives the network side notification information sent by the upper layer, and the network side notification information is used to indicate the first The user terminal on the network side scans different subframes of the second network side base station.

In this embodiment, the uplink subframe and the downlink subframe format ratio between the first network side and the second network side include:

The base station of the first network side scans different subframes of the second network side base station, and the base station of the first network side measures the RSSI of the cell reference signal CRS of the different subframe of the second network side base station, according to the RSSI. The subframe format of the different subframes, or the base station on the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, and determines the subframe of the different subframe according to the PBCH TDD configuration information. Format, the subframe format includes: an uplink subframe, and a downlink subframe.

In this embodiment, before the base station on the first network side scans different subframes of the second network side base station, the base station on the first network side configures a measurement protection interval of the user terminal in the base station, where the measurement protection interval indicates the The time period indicated by the user terminal in the measurement protection interval, on the first network side The base station scans different subframes of the second network side base station.

In this embodiment, the uplink subframe and the downlink subframe format ratio between the first network side and the second network side include:

The user terminal on the first network side and the base station on the first network side scan different subframes of the second network side base station, and the user terminal on the first network side and the base station on the first network side measure the second subframe together The RSSI of the CRS of the different subframes of the network side base station, and determining the subframe format of the different subframe according to the RSSI;

The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframe on the second network side.

In this embodiment, the scanning different subframes of the second network side base station includes one of the following:

Scanning base stations corresponding to all carrier frequencies on the second network side;

The base station corresponding to the carrier frequency of the preset number of the second network side is scanned, wherein the preset number of carrier frequencies are configured by the upper layer, and are sent to the user terminal by the base station to which the user terminal belongs.

In this embodiment, the determining, by the first network side, whether the downlink to uplink interference avoidance mechanism is enabled includes:

After the base station of the first network side acquires the subframe format of the second network side, the base station of the first network side acquires an uplink overload interference indication OI sent by the second operating base station, where the OI reflects the network side frequency domain dimension. The interference level, the second network side measures the OI for different resource blocks of the current uplink subframe, and the value of the OI includes one of the following: strong interference, normal interference, weak interference;

The base station transmit power of the first network side is adjusted according to the OI.

In this embodiment, the acquiring, by the base station on the first network side, the uplink overload interference indication OI sent by the second operating base station includes:

When the OI coordination time arrives, the base station on the first network side acquires the OI fed back by the base station on the second network side.

In this embodiment, the adjusting the base station transmit power of the first network side comprises: adjusting a cell reference signal CRS power of the base station on the first network side

The subframe format on the first network side is the same as the subframe format on the second network side, and is used in the same manner. Current CRS transmit power;

The subframe format on the first network side is different from the subframe format on the second network side, and the current CRS transmission power is used in the absence of the intersection subframe;

The subframe format of the first network side is different from the subframe format of the second network side, and the cell reference signal CRS transmission power of the base station of the first network side is reduced at the intersection subframe;

The sub-frame format of the first network side is the sub-frame format of the downlink sub-frame and the sub-frame format of the second network side is the sub-frame of the uplink sub-frame.

In this embodiment, while adjusting the cell reference signal CRS transmit power of the base station on the first network side, the method further includes:

At the handover subframe, the base station side base station reduces the cell reference signal CRS transmission power, and when the reference signal reception power RSRP is measured, the cell reference signal CRS transmission power does not change;

At the intersection subframe, the base station side of the first network side reduces the cell reference signal CRS transmission power, and when the user terminal on the first network side selects the access cell, the measured reference signal received power RSRP value is offset. a value that is notified by the higher layer to the user terminal;

When the base station side base station reduces the cell reference signal CRS transmission power at the handover subframe, the user terminal on the first network side does not perform the process of accessing the cell, and does not measure the RSRP.

In this embodiment, adjusting the base station transmit power of the first network side according to the OI includes:

When the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power;

In case the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format.

The modified subframe format includes one of the following:

Modified to a subframe format containing a preset number of downlink transmissions;

The subframe format of the first network side is modified to be the same as the subframe format of the second network side.

In this embodiment, after the base station on the first network side modifies the subframe format, the method includes one of the following:

Transmitting the information of the modified subframe format to the central node, where the central node determines the uplink-downlink UL-DL configuration in the first network side based on the modified subframe format and the original uplink UL/downlink DL transmission load information. The central node sends the result of the configuration to other nodes on the first network side;

Sending the new uplink-downlink UL-DL configuration to each node on the first network side, where each node determines whether to modify the subframe format according to its own uplink-downlink UL-DL configuration and a new subframe configuration. .

In the embodiment, a processing device for uplink and downlink interference coordination is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 2 is a structural block diagram of a processing apparatus for uplink and downlink interference coordination according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes:

The transmission module 22 is configured to match the uplink subframe and the downlink subframe format transmitted between the first network side and the second network side, where the second network side is the adjacent frequency band or the same frequency band of the first network side. a neighboring network, the first network side supports full downlink subframe transmission;

The opening module 24 is configured to be connected to the transmission module 22. The first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side.

The uplink subframe and the downlink subframe format that are transmitted between the first network side and the second network side are matched by the foregoing apparatus, where the second network side is a neighboring frequency band or an adjacent network of the first network side, The first network side supports full downlink subframe transmission, and the first network side determines whether to enable the downlink uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio, and solves the support of the adjacent frequency band and the same frequency band. The downlink side frame format network side and the network side supporting only the existing TDD subframe format interfere with the coordination problem, and effectively implement different downlink-to-uplink interference coordination on the network side.

In this embodiment, the transmission module 22 includes:

a first scanning unit, configured to scan the second network side base station by the user terminal on the first network side The user equipment of the first network side measures the RSSI of the cell reference signal CRS of the different subframe of the second network side base station, and determines the subframe format of the different subframe according to the RSSI, or the first subframe A user terminal on the network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, and determines a subframe format of the different subframe according to the PBCH TDD configuration information, where the subframe format includes: an uplink subframe, And a downlink subframe;

The first scanning unit is further configured to: the user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframe on the second network side.

In this embodiment, the transmission module 22 includes:

a second scanning unit, configured to: the base station on the first network side scans different subframes of the second network side base station, and the base station on the first network side measures a cell reference signal CRS of the different subframe of the second network side base station The RSSI determines the subframe format of the different subframes according to the RSSI, or the base station of the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, and determines according to the PBCH TDD configuration information. The subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe.

In this embodiment, the transmission module 22 includes:

a third scanning unit, configured to scan the different subframes of the second network side base station, and the first network side user terminal and the first network side by using the user equipment of the first network side and the base station of the first network side The base station simultaneously measures the RSSI of the cell reference signal CRS of different subframes of the second network side base station, and determines the subframe format of the different subframe according to the RSSI;

The third scanning unit is further configured to: the user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframe on the second network side.

In this embodiment, the opening module 24 includes:

The adjusting unit is configured to: after the base station of the first network side acquires the subframe format of the second network side, the base station of the first network side acquires an uplink overload interference indication OI sent by the second operating base station, where the OI is used by Reflecting the interference level of the network side frequency domain dimension, the second network side measures the OI for different resource blocks of the current uplink subframe, and the value of the OI includes one of the following: strong interference, normal interference, weak interference; The OI adjusts the base station transmit power of the first network side.

In this embodiment, the adjusting unit includes:

a power adjustment subunit, configured to: when the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power;

The format adjustment sub-unit is configured to: when the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format.

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

The technical problem to be solved by the present embodiment is to provide an uplink and downlink interference coordination processing method and device for different network sides of the same frequency band and the adjacent frequency band, especially for the network side coexistence problem of different subframe formats after the introduction of the full downlink subframe format. Effective.

A method for coordinating downlink to uplink interference according to an embodiment of the present invention includes:

The uplink and downlink subframe format ratios are transmitted between the network sides;

The network side that supports full downlink subframe transmission turns on the downlink-to-uplink interference avoidance mechanism.

The network side transmits the uplink-downlink subframe format ratio, including: the network side (1) the user terminal obtains the subframe type by measuring the RSSI of the CRS in different subframes to receive the signal strength. When the current subframe power value is large and the energy is large, it is a downlink subframe. Otherwise, since the UL subframe does not transmit the CRS, the current subframe power value is small, and the energy is small, and the uplink subframe is an uplink subframe.

Specifically, the subframe format of the adjacent frequency cell is scanned according to the existing LTE cell search process. Synchronizing with the base station of the adjacent frequency network side (2) in frequency and symbol according to a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS), and learning the network side ( 2) PCI (Physical-layer Cell Identity) of the base station. Since the time-frequency position of the CRS pattern is in one-to-one correspondence with the PCI, the CRS time-frequency position of the base station in the network side (2) is also known.

Network side (1) The user terminal measures the CRS RSSI of the network side (2) at the current time, and correlates the RSSI value with the known network side (2) base station CRS sequence, if the signal strength peak value is greater than the threshold after the correlation operation The value indicates that the current subframe of the baseband side (2) base station is a DL subframe; if the peak value of the received signal strength after the correlation operation is less than the threshold value, it indicates that the current subframe of the same-frequency network side (2) is the UL subframe of the base station. . The threshold is a high-level configuration, and the base station notifies the user terminal.

The network side transmits the uplink-downlink subframe format ratio, and may further include: the network side (1) the user terminal decodes the PBCH TDD configuration information of the adjacent frequency network side (2), thereby knowing the upper and lower The sub-frame format is sent and reported to the network side.

For the foregoing two measurement subframe type methods, scanning the subframe format of the adjacent frequency base station, the scanning granularity may be scanning all the possible carrier frequency corresponding cells, or scanning only a certain number of carrier frequency corresponding base stations in the frequency band. Specifically refers to:

Scanning all possible carrier-corresponding base stations refers to scanning all intra-band corresponding base stations except intra-bands on the intra-band (in-band). The duplex mode is determined for all the base stations, and the processing increases the workload and complexity of the base station on the network side, but can completely eliminate the uplink and downlink interference problems.

Scanning a certain number of carrier-frequency corresponding base stations on the intra-band, which means that only the uplink and downlink subframe configurations of the network side corresponding to the adjacent carrier frequency are scanned according to the high-level notification, which greatly reduces the workload of the base station on the network side. And complexity, but can only effectively eliminate a certain degree of uplink and downlink interference problems, and can not solve the coexistence problem of all adjacent frequency base stations.

The user terminal in the network side (1) can know the subframe format of the adjacent frequency base station by using two methods, and report the subframe format to the base station. The user reports the subframe format index of the network side (2) to the base station according to the existing subframe format index.

Optionally, the network side information is sent by the upper layer to notify the user terminal to measure the adjacent frequency cell subframe format.

The network side transmits the uplink-downlink subframe format ratio, and supports the full downlink subframe format. The network side base station itself can also measure the adjacent frequency cell subframe format by using the RSSI mode or the decoding PBCH mode, that is, the execution end is the base station. itself. The maximum difference between the processing mode and the user terminal's measurement of the neighboring cell sub-frame format is that the process of reporting the base station by the user is omitted, and the signaling overhead and the feedback delay are reduced. However, the disadvantage is that the user terminal loses the ability to actively determine whether to access the base station in the full downlink subframe format.

The capability of the user terminal to determine whether to access the base station in the full downlink subframe format specifically refers to: when the base station incorrectly determines the subframe format of the adjacent frequency base station, for example, determining the UL subframe as a DL subframe, or determining the TDD as FDD, thereby The configuration of the full-downlink subframe is enabled, and the user terminal determines whether the downlink-to-uplink interference is generated to the adjacent-frequency base station by using the measurement, thereby actively denying access to the network side of the full-downlink subframe format. . That is, this capability is an additional measure of protection.

When the network side base station itself measures the subframe format of the adjacent frequency cell, it is required to configure a measurement protection interval for the user terminal in the base station, thereby preventing the gap in the gap period. When the base station side measures the subframe type of the adjacent frequency base station, the user terminal may not detect the link interruption of the eNB signal strength. The cell supporting the full downlink subframe format cannot simultaneously perform uplink and downlink transmission and reception, that is, the PSS/SSS/CRS signal is transmitted downstream of the receiving adjacent frequency base station, because the cell supporting the full downlink subframe format is measuring the subframe format of the adjacent frequency base station. The measurement subframe type cannot simultaneously transmit downlink data to the user terminal in the cell, so that the user terminal in the cell may reselect the access cell.

The network side transmits the uplink-downlink subframe format ratio, and the user terminal and the base station itself in the network side measure the adjacent-frequency cell subframe format. The measurement method is unchanged and is also RSSI and PSS/SSS/CRS. In this way, the advantage is that when the base station side measures the format of the adjacent-frequency cell subframe, the user terminal can automatically determine the base station side by measuring the frame format of the adjacent-frequency base station by itself. Whether the instruction is wrong or not, when it is found that the adjacent frequency base station is a DL subframe or has a large interference, the access to the full downlink subframe format is denied, and double protection is provided. But the shortcoming is also obvious, which is to increase the signaling overhead and feedback delay of user feedback.

After the network side supporting the full downlink subframe has learned the subframe format of the adjacent frequency base station, consider whether to enable the downlink uplink interference avoidance mechanism.

The interference avoidance mechanism may be: adjusting the transmit power of the network side of the full downlink subframe format according to the UL Interference Overload Indicator (OI). The OI indication in the existing LTE protocol (3GPP TS36, 423) is used to reflect the interference level of the network side frequency domain dimension. First, the available resources of the interfered cell are divided into N resource blocks (Resource Blocks, RBs), and the index is RB 0. , RB1, ..., RB N-1; then an OI indication is generated for the RB index, ie the corresponding frequency domain location. The value indicated by the OI may be “high interference”, “medium interference” or “low-medium interference”, respectively indicating that the interference is large and the interference is moderate. Or the received interference is small; the generated OI indication is notified to the interfering base station through the X2 interface, so that the interfering base station can perform interference coordination operation for the eNB-to-eNB interference.

The network side base station supporting the full downlink subframe transmission adjusts the transmit power according to the OI indication, including:

The neighboring frequency or the same-frequency interfered network-side base station feeds back the uplink interference level in the frequency domain dimension to the interfering cell, that is, the cell supporting the full downlink subframe type.

Wherein, the adjacent frequency or the same frequency is interfered by the network side base station feedback OI indication is semi-static mode, that is, on The line interference overload indicates that when the interference coordination time arrives, the interfered base station indicates to the interference base station through the feedback OI.

Optionally, the interfered network side base station feeds back the OI indication to the interfering base station through the air interface.

The interfering base station, that is, the base station supporting the full downlink subframe type, adjusts the transmit power after receiving the OI feedback.

The adjustment of the transmit power refers to adjusting the CRS (Cell Reference Siganal, specifically refers to the cell reference signal) power of the interfering base station, and does not adjust the data transmission power of the base station. By adjusting the CRS power, the data transmission power of the base station is ensured, thereby reducing the downlink interference to the interfering base station and ensuring the downlink transmission performance of the base station.

The adjusting the transmit CRS power may include two situations:

Case 1: There are different power settings for different subframes. When the network side of the different subframe format does not have a handover subframe, the previous CRS transmission power is used, that is, the CRS transmission power of the interference base station is not adjusted;

The sub-frames of the different network side are the same at the current time, that is, the DL sub-frames are all UL sub-frames, so that no uplink and downlink interference problems occur.

Case 2: At the intersection subframe, the interfering base station reduces the CRS transmission power of the cell, thereby reducing the downlink to uplink interference level.

The convergence sub-frame indicates that the subframe type of the different network side is different at the current time, that is, the subframe type of the interfered base station is a UL subframe, and downlink interference is generated.

The interfering base station reduces the CRS transmission power at a certain time, thereby causing different cell coverage, so that the user terminal of the cell selects a cell shrinkage problem when the serving cell accesses according to the reduced RSRP. To avoid the above problem, the interfering base station performs RSRP based on the CRS. There are three ways to measure: these three methods specifically refer to:

Mode 1: At the handover subframe, the base station CRS reduces the transmission power and performs downlink transmission; however, the measurement RSRP still uses the original CRS transmission power. Therefore, there is no problem of cell shrinkage.

Mode 2: At the handover subframe, the user terminal calculates the RSRP according to the CRS that reduces the transmission power of the base station, but when the user terminal selects the cell access, the offset value is added to the RSRP value. The offset offset value is notified to the user terminal by the upper layer.

Mode 3: At the handover subframe, the base station does not perform RSRP measurement based on the CRS as the user. The terminal selects a process of accessing the cell.

After receiving the OI feedback, the interfering base station adjusts its transmit power, including:

When the interfering base station feedback OI indicates "low-medium interference", the interfering base station reduces the CRS transmission power, thereby reducing the downlink-to-uplink interference.

When the interfering base station feedback OI indicates "high interference", the interfering base station does not enable support for full downlink subframe format transmission, and or modify the subframe format.

The modified subframe format can be modified to a subframe format with less DL transmission, but the downlink transmission performance of the base station is rapidly degraded and the uplink and downlink interference cannot be completely eliminated.

The modified subframe format may be modified to be the same subframe format as the same frequency or adjacent frequency interfered base station. This approach reduces the existing standard by less than adaptively reducing the transmit power and completely eliminates interference.

After the interfering base station supporting the full downlink subframe type in the network side (2) modifies the uplink and downlink subframe format type, it affects the base stations of other TDD subframe formats in the network side, because after modifying the subframe format, the network Other base stations in the side also coordinate their own subframe type after modifying the subframe type for the base station. For different base stations in the network side, how to coordinate TDD uplink and downlink reconfiguration can include both centralized and distributed:

Centralized means that the base station supporting the full downlink subframe format sends the modified subframe format information to the central node, and the central node determines the UL in the network side based on the modified subframe format and the original UL/DL traffic load information. The DL is configured and the configuration result is sent to each cell node. This method needs to determine the central node, which coordinates or determines the UL-DL configuration and feeds back to each other node.

Distributed means that the cell node in the full downlink subframe format in the network side notifies other cells through the air interface, and tends to adopt the new UL-DL configuration. Then, other cell nodes are configured and received according to the original UL-DL configuration. A new subframe configuration supported by the full downlink subframe cell is supported to comprehensively determine whether to modify the subframe type.

The following embodiments are directed to the problem of uplink and downlink coexistence on two different network sides. The base station in the network side 1 is a new subframe type that supports the TDD network side subframe format as full downlink and also supports the existing traditional subframe format. The base station in 2 refers to only supporting the existing conventional subframe format on the TDD network side. Fake The network side 2 is a TDD DL/UL type that has been deployed or has a priority to be deployed. The network side 1 is a TDD full downlink subframe type that is to be deployed on the network side 2 with the same frequency.

Example 1

FIG. 3 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 1 of the present invention. As shown in FIG. 3, the method includes:

In step S301, the user terminal in the network side 1 obtains synchronization with the base station of the adjacent frequency network side 2 in frequency and symbol according to the PSS (Primary Synchronization Signal) and/or the Secondary Synchronization Signal (SSS).

The specific process is: the user terminal obtains synchronization with the base station of the adjacent frequency network side 2 in frequency and symbol according to the PSS and/or the SSS, and learns the PCI (Physical-layer Cell Identity) of the network side 2 base station. Cell identification).

Step S302: The user terminal in the network side 1 learns the TDD subframe format of the network side 2 according to the RSSI power value.

The specific process is: since the time-frequency position of the CRS pattern is in one-to-one correspondence with the PCI, the PCI knows the CRS time-frequency position of the base station in the network side 2.

The network side 1 user terminal measures the CRS RSSI of the network side 2 at the current time, and performs correlation calculation between the RSSI value and the known network side 2 base station CRS sequence. If the signal strength peak value after the correlation operation is greater than the threshold value, The current subframe of the same-frequency network side 2 base station is a DL subframe; if the peak value of the received signal strength after the correlation operation is less than the threshold value, it indicates that the current subframe of the same-frequency network side 2 base station is a UL subframe.

The threshold is a high-level configuration, and the base station notifies the user terminal.

Step S303: The network side 1 user terminal feeds back the measured TDD subframe format index of the network side 2 to the base station.

According to the specific steps of S301 to S303, after the network side 1 base station obtains the same-frequency network side 2 TDD subframe format, the corresponding interference coordination mechanism is started according to the interference intensity.

Step S304, the network side 2 measures an OI indication in different RBs of the current UL subframe, and FIG. 4 is a schematic diagram of an OI indication format in the related art according to an embodiment of the present invention. As shown in FIG. 4, for RB 0, RB 1, ..., the RB N-1 index generates an OI indication. The value indicated by the OI may be “strong interference”, “Normal interference” or “weak interference”.

Step S305: When the uplink interference overload indicates that the interference coordination time arrives, the network side 1 base station has acquired the OI indication sent by the network side 2 base station, and starts different interference coordination mechanisms according to the obtained interference strength.

Assuming that the OI indication notified by the network side 2 base station is “low-medium interference”, the interfering base station, ie, the network side 1 base station, reduces the CRS transmission power, thereby reducing the downlink-to-uplink interference.

Step S306: At the intersection subframe, that is, the network side 1 is a DL subframe, and the network side 2 is a UL subframe; the network side 1 only reduces the CRS transmission power when transmitting downlink data. However, the original CRS transmission power is still used in the measurement of the RSRP, so that the user terminal in the base station does not affect the process of selecting the access cell.

Example 2

FIG. 5 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 2 of the present invention. As shown in FIG. 5, steps S501 to S506 are included. Compared with the first embodiment, the steps S502 and S506 are different from the steps S302 and S306. The difference is that, in the step S502, the user terminal in the network side 1 acquires the TDD subframe type of the same-frequency network side 2 base station according to the decoding network side 2 PBCH. .

The specific process is: the user terminal in the network side 1 decodes the PBCH of the network side 2, and obtains the uplink and downlink configuration format of the TDD of the base station carried by the network information SIB1 (System Information Blocks). The transmission period of the SIB1 is 80 ms, and the same transmission is repeated 3 times in one transmission period in order to ensure correct reception of the cell edge user.

In step S506, at the intersection subframe, that is, the network side 1 is a DL subframe, and the network side 2 is a UL subframe; the base station reduces the CRS transmission power for downlink transmission, and also calculates the RSRP based on the power value, but the user terminal receives The offset value is added to the RSRP value to determine which cell to access according to RSRP+offset. The offset offset value is a high layer configuration, and the base station notifies the user terminal.

Example 3

FIG. 6 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 3 of the present invention. As shown in FIG. 6, steps S601-S606 are included. Compared with the embodiment, the steps S601 to S605 are the same as the steps S301 to S305, and the difference is that, in the step S606, at the intersection subframe, that is, the network side 1 is a DL subframe, and the network side 2 is a UL subframe; the network side 1 reducing the CRS transmit power for downlink transmission, reducing the UL transmission interference to the network side 2, but reducing the CRS for the user terminal in the network side 1 When the power is transmitted, the RSRP measurement is not performed, that is, the cell selection process is not performed. Therefore, the user terminal of the cell is selected to select a cell shrinkage problem generated when the serving cell accesses according to the reduced RSRP.

Example 4

FIG. 7 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 4 of the present invention. As shown in FIG. 7, steps S701-S706 are included. The steps S701 to S704 are the same as the first to third embodiments, and the difference is that, in step S705, when the uplink interference overload indicates that the interference coordination time arrives, the network side 1 base station has acquired the OI indication sent by the network side 2 base station. If the OI indication is "high interference", then the interfering base station, that is, the network side 1 base station will not enable the full downlink subframe format transmission, and will comprehensively consider which one will be used according to the actual downlink service ratio and the type of the interfered base station subframe. Line subframe configuration.

In step S706, when the current downlink service ratio is high, the subframe format is configured to be 1 or 2, and the downlink subframe occupies half of a wireless subframe, that is, the downlink traffic demand is met, and the adjacent channel interference can be effectively reduced. However, this method does not completely eliminate the uplink and downlink interference.

Example 5

FIG. 8 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 5 of the present invention. As shown in FIG. 8, steps S801 to S806 are included. The method of the steps S801 to S805 is the same as that of the fourth embodiment. The difference is that, in the step S806, the base station in the network side 1 has a very serious uplink interference to the network side 2 base station, which has caused the uplink transmission throughput to be sharply reduced to zero, thereby measuring the base station. The proportion of uplink and downlink services and the interference weight to the same frequency base station tend to reduce interference. That is, the modified subframe format is the same subframe format as the base station 2 base station. Compared with the adaptive reduction of CRS transmission power, this method has fewer changes to the existing 3GPP standards and can completely eliminate downlink-to-uplink interference.

Example 6

In the embodiment 6, the measurement network side 2 subframe format implementation body in the network side 1 has the biggest difference from the foregoing embodiments 1 to 5 in that the network side 1 base station measures the network side 2 subframe format instead of the user terminal.

FIG. 9 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 6 of the present invention. As shown in FIG. 9, steps S901-S902 are respectively the same as steps S301-S302 of the embodiment, but the implementation body is changed by the user terminal. The base station itself. And omitting the user terminal reporting the adjacent frequency in step S303 The subframe format of the base station is given to the base station. Because the network side 1 base station has measured the known adjacent frequency base station subframe format.

Step S903 is added. When the network side base station itself measures the subframe format of the adjacent frequency cell, the measurement gap needs to be configured for the user terminal in the base station. In the gap phase, the base station measures the subframe format of the adjacent frequency base station, and the user terminal in the base station does not re-access other cells. The measurement gap is configured by a higher layer.

Other interference coordination methods are the same as the above-described implementation examples.

Example 7

In the seventh embodiment, the measurement network side 2 subframe format implementation body in the network side 1 has the biggest difference from the foregoing embodiments 1 to 7 in that the base station and the user terminal in the network side 1 both measure the network side 2 subframe format, and It is not the user terminal or the base station alone to measure.

10 is a schematic flowchart of downlink-to-uplink interference coordination according to Embodiment 7 of the present invention. As shown in FIG. 10, the method includes steps S1001 to S1005, and both the user terminal and the base station measure the adjacent-frequency base station subframe format. Therefore, when the base station side measures the subframe format of the adjacent-frequency cell is incorrect, and the erroneously triggers the full-sub-frame format, the user terminal can automatically determine whether the instruction on the base station side is incorrect by measuring the format of the adjacent-frequency base station subframe. When the neighboring base station is found to be a DL subframe or has a large interference, the access to the full downlink subframe format is denied, and double protection is provided. But the shortcoming is also obvious, which is to increase the signaling overhead and feedback delay of user feedback.

Example 8

Embodiment 8 is directed to the foregoing Embodiments 1 to 7, when the user terminal and/or the base station supporting the full-downlink subframe format in the network side 1 measures the subframe format of the intra-band base station, how to scan the number of base stations in the intra-band, That is, consider scanning the granularity.

Assuming 100MHz intra-band size, including the base station has a total of 10 intra-frequency base stations, each base station is 10MHz bandwidth. Then, the user terminal and/or the base station in the network side 1 scans the base station subframe format corresponding to all possible carrier frequencies on the intra-band; that is, scans 9 carrier-frequency corresponding base stations (except the base station).

This scanning granularity can completely eliminate the uplink and downlink interference problems, but it will increase the workload and complexity of the network side.

Example 9

The method for scanning the intra-band base station granularity of Embodiment 9 is different from Embodiment 8 in that only a certain number of carrier-frequency corresponding base stations on the intra-band are scanned. The user terminal and/or the base station in the network side 1 scans only the uplink and downlink subframe configurations of the base station corresponding to the most adjacent three carrier frequencies according to the high layer notification. This kind of processing greatly reduces the workload and complexity of the network side, but can only effectively eliminate a certain degree of uplink and downlink interference problems, and cannot solve the coexistence problem of all adjacent frequency base stations.

Example 10

FIG. 11 is a schematic diagram of centralized coordination of different base station subframe formats according to a preferred embodiment 10 of the present invention, after the interfering base station eNB1 supporting the full downlink subframe format in the network side 1 modifies the uplink and downlink subframe format type, as shown in FIG. It is shown that the reconfiguration of other base station subframe formats in the network side is coordinated in a centralized manner. The eNB1 sends the modified subframe format information to the central node, and the central node determines the UL-DL configuration of the eNB1, the eNB2, and the eNB3 in the network side based on the modified subframe format and the UL/DL traffic load information of the eNB1, and The configuration result is sent to each cell node. This method needs to determine the central node, which coordinates or determines the UL-DL configuration and feeds back to each other node. In this implementation example, eNB2 is the central node.

Example 11

FIG. 12 is a schematic diagram of distributed coordination of different base station subframe formats according to a preferred embodiment 11 of the present invention, after the interfering base station eNB1 supporting the full downlink subframe format in the network side 1 modifies the uplink and downlink subframe format type, as shown in FIG. It is shown that the reconfiguration of other base station subframe formats in the network side is coordinated in a distributed manner. The eNB1 notifies the eNB2 and the eNB3 of the modified subframe format information through the X2 interface. And at the pre-interaction moment, eNB1 has learned that eNB2 and eNB3 now use the subframe format. The eNB2 and the eNB3 comprehensively determine the finally adopted UL-DL configuration according to the UL-DL configuration adopted by itself and the UL-DL configuration that the eNB3 tends to adopt.

Example 12

In the foregoing implementation example, the adjacent frequency base station may also be a base station supporting a full downlink subframe type, and is not limited to only using a conventional TDD subframe type. In addition to measuring the base station subframe type of the network side 2 according to the foregoing PSS/SSS+RSSI or PSS/SSS+PBCH methods, the network side 1 optionally measures only the subframe number in one wireless subframe of the network side 2. #1's subframe type, as shown in Table 1, if measured If the #1 subframe is a D subframe, then the base station supporting the full downlink subframe type, the base station between the network side 1 and the network side 2 does not need to coordinate the inter-base station interference, if the #1 subframe is measured as S Subframes, which are base stations of the traditional subframe type, need to open different interference coordination methods according to the interference size.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present application.

Embodiments of the present invention also provide another computer readable storage medium storing computer executable instructions that are implemented by a processor to implement the above method.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in this embodiment, the processor performs the method steps of the foregoing embodiments according to the stored program code in the storage medium.

Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the application is not limited to any particular combination of hardware and software.

The above description is only for the embodiments of the present application, and is not intended to limit the present application, and various changes and modifications may be made by those skilled in the art. Where in the spirit and original of this application Any modifications, equivalent substitutions, improvements, etc., are intended to be included within the scope of this application.

Industrial applicability

An embodiment of the present invention provides a method and a device for processing uplink and downlink interference coordination, so as to at least solve the related art, the adjacent frequency band and the same frequency band support the full downlink subframe format network side and only support the existing TDD subframe. How the network side of the format interferes with the coordination problem.

The method may include: an uplink subframe and a downlink subframe format ratio transmitted between the first network side and the second network side, where the second network side is a neighboring frequency band or the same on the first network side The adjacent network of the frequency band, the first network side supports full downlink subframe transmission; the first network side determines whether to enable downlink to uplink according to the ratio of the uplink subframe and the downlink subframe format of the second network side. Interference avoidance mechanism.

The embodiment of the present invention solves the problem of how to interfere with coordination in the neighboring frequency band and the network side supporting the full downlink subframe format and the network side supporting only the existing TDD subframe format, and effectively implements downlink to uplink interference on different network sides. coordination.

Claims (22)

A method for processing uplink and downlink interference coordination, comprising: The uplink subframe and the downlink subframe format transmitted between the first network side and the second network side are matched, wherein the second network side is a neighboring frequency band of the first network side or a neighboring network of the same frequency band, The first network side supports full downlink subframe transmission; The first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side. The method according to claim 1, wherein the transmission of the uplink subframe and the downlink subframe format ratio between the first network side and the second network side comprises: The user terminal on the first network side scans different subframes of the second network side base station, and the user equipment on the first network side measures the RSSI of the cell reference signal CRS in different subframes of the second network side base station. Determining, according to the RSSI, the subframe format of the different subframes, or the user terminal on the first network side decoding the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, according to the PBCH TDD The configuration information is used to determine a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe; The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframes on the second network side. The method according to claim 2, wherein the determining, according to the RSSI, the subframe format of the different subframes comprises: The user terminal on the first network side obtains synchronization with the base station on the second network side in frequency and symbol according to the primary synchronization signal PSS and/or the secondary synchronization signal SSS, and acquires a physical layer cell of the second network side base station. Identify PCI; Obtaining, according to the PCI, a time-frequency location of the cell reference signal CRS of the second network-side base station, where the CRS pattern time-frequency location is in one-to-one correspondence with the PCI; The user terminal on the first network side measures the RSSI of the CRS on the second network side at a current time; Performing a correlation operation according to the RSSI and the CRS to obtain a signal strength peak; Determining that the current subframe of the second network side base station is a downlink subframe, where the signal strength peak is greater than a preset threshold; Determining that the current subframe of the second network side base station is an uplink subframe, where the signal strength peak is less than a preset threshold; The preset threshold is configured by the upper layer, and is sent to the user terminal by the base station to which the user terminal belongs. The method according to claim 2, before the user terminal on the first network side scans different subframes of the second network side base station, the method further includes: The user terminal receives the network side notification information sent by the upper layer, and the network side notification information is used to instruct the user terminal on the first network side to scan different subframes of the second network side base station. The method according to claim 1, wherein the transmission of the uplink subframe and the downlink subframe format ratio between the first network side and the second network side comprises: The base station on the first network side scans different subframes of the second network side base station, and the base station on the first network side measures the RSSI of the cell reference signal CRS in different subframes of the second network side base station, according to the The RSSI determines the subframe format of the different subframes, or the base station on the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, and determines according to the PBCH TDD configuration information. a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe. The method according to claim 5, before the base station on the first network side scans different subframes of the second network side base station, the method further includes: The base station on the first network side configures a measurement protection interval of the user terminal in the base station, where the measurement protection interval indicates that the user terminal scans the base station on the first network side in a time period indicated by the measurement protection interval. Different subframes of the second network side base station. The method according to claim 1, wherein the transmission of the uplink subframe and the downlink subframe format ratio between the first network side and the second network side comprises: The user terminal on the first network side and the base station on the first network side scan different subframes of the second network side base station, the user terminal on the first network side, and the base station on the first network side Measuring the RSSI of the CRS of different subframes of the second network side base station together, according to the RSSI Breaking the subframe format of the different subframes; The user terminal on the first network side feeds back to the base station to which the user terminal belongs to measure the format of the different subframes on the second network side. The method according to any one of claims 2 to 7, wherein the scanning different subframes of the second network side base station comprises one of the following: Scanning, by the base station corresponding to all carrier frequencies on the second network side; The base station corresponding to the carrier frequency of the preset number of the second network is scanned, wherein the preset number of carrier frequencies are configured by the upper layer, and are sent to the user terminal by the base station to which the user terminal belongs. The method according to claim 1, wherein the determining, by the first network side, whether the downlink-to-uplink interference avoidance mechanism is enabled comprises: After the base station of the first network side acquires the subframe format of the second network side, the base station of the first network side acquires an uplink overload interference indication OI sent by the second operating base station, where the OI is used. Reflecting the interference level of the network side frequency domain dimension, the second network side measures the OI for different resource blocks of the current uplink subframe, and the value of the OI includes one of the following: strong interference, normal interference, weak interference; Adjusting base station transmit power of the first network side according to the OI. The method according to claim 9, wherein the acquiring, by the base station on the first network side, the uplink overload interference indication OI sent by the base station on the second network side comprises: When the OI coordinated time arrives, the base station on the first network side acquires the OI fed back by the base station on the second network side. The method according to claim 9, wherein the adjusting the base station transmit power of the first network side comprises: Adjusting a cell reference signal CRS power of the base station on the first network side; The subframe format of the first network side and the subframe format of the second network side are the same, and the current CRS transmission power is used; The subframe format on the first network side is different from the subframe format on the second network side, and the current CRS transmission power is not used at the intersection subframe; the subframe format on the first network side and the first The subframes of the two network sides are different in format, and the base station on the first network side reduces the CRS transmission power of the cell reference signal; The sub-frame format of the first network side is a sub-frame format of the downlink sub-frame and the sub-frame format of the second network side is an uplink sub-frame. The method according to claim 11, further comprising: while adjusting a cell reference signal CRS transmission power of the base station of the first network side, At the intersection subframe, the base station on the first network side reduces the CRS transmission power, and at the same time, when the reference signal reception power RSRP is measured, the CRS transmission power does not change; At the intersection subframe, the base station side base station reduces the CRS transmission power, and when the user terminal on the first network side selects the access cell, adds the offset to the measured reference signal received power RSRP value. a value, the offset value is notified by the higher layer to the user terminal; When the base station on the first network side reduces the CRS transmission power, the user terminal on the first network side does not perform the process of accessing the cell, and does not measure the RSRP. The method according to claim 9, wherein the adjusting the base station transmit power of the first network side according to the OI comprises: When the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power; In case the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format. The method of claim 13 wherein the modified subframe format comprises one of the following: Modified to a subframe format containing a preset number of downlink transmissions; Modifying the subframe format of the first network side is the same as the subframe format of the second network side. The method according to claim 14, wherein after the base station on the first network side modifies the subframe format, the method includes one of the following: Transmitting the information of the modified subframe format to a central node, where the central node determines the first network side based on the modified subframe format and the original uplink UL/downlink DL transmission load information An intra-uplink-downlink UL-DL configuration, the central node transmitting the result of the configuration to other nodes on the first network side; Transmitting the new uplink-downlink UL-DL configuration to each node on the first network side, where each node determines whether to modify according to its own uplink-downlink UL-DL configuration and a new subframe configuration. Subframe format. A processing device for uplink and downlink interference coordination, comprising: a transmission module, configured to match an uplink subframe and a downlink subframe format transmitted between the first network side and the second network side, where the second network side is a neighboring frequency band or a same frequency band of the first network side a neighboring network, where the first network side supports full downlink subframe transmission; The module is enabled, and the first network side determines whether to enable the downlink-to-uplink interference avoidance mechanism according to the uplink subframe and the downlink subframe format ratio of the second network side. The apparatus of claim 16 wherein said transmission module comprises: a first scanning unit, configured to scan, by the user terminal on the first network side, different subframes of the second network side base station, where the user equipment on the first network side measures different subframes of the second network side base station The RSSI of the cell reference signal CRS determines the subframe format of the different subframe according to the RSSI, or the user terminal of the first network side decodes the physical broadcast channel PBCH of the second network side, and the time division duplex TDD configuration And determining, according to the PBCH TDD configuration information, a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe; The first scanning unit is further configured to: the user terminal on the first network side feeds back, to the base station to which the user terminal belongs, the format of the different subframes on the second network side. The apparatus of claim 16 wherein said transmission module comprises: a second scanning unit, configured to: the base station on the first network side scans different subframes of the second network side base station, and the base station on the first network side measures CRS of different subframes in the second network side base station The RSSI determines the subframe format of the different subframes according to the RSSI, or the base station of the first network side decodes the physical broadcast channel PBCH time division duplex TDD configuration information of the second network side, according to the PBCH The TDD configuration information determines a subframe format of the different subframes, where the subframe format includes: an uplink subframe, and a downlink subframe. The apparatus of claim 16, the transmission module comprising: a third scanning unit, configured to scan the different subframes of the second network side base station, and the user terminal and the first network side user terminal together with the base station on the first network side The base station of the first network side simultaneously measures the RSSI of the CRS of the different subframes of the second network side base station, and determines the subframe format of the different subframe according to the RSSI; The third scanning unit is further configured to: the user terminal on the first network side feeds back, to the base station to which the user terminal belongs, the format of the different subframes on the second network side. The device of claim 16, the opening module comprising: After the base station of the first network side obtains the subframe format of the second network side, the base station of the first network side acquires an uplink overload interference indication OI sent by the second operating base station, The OI is used to reflect the interference level of the network side frequency domain dimension, and the second network side measures the OI for different resource blocks of the current uplink subframe, where the value of the OI includes one of the following: strong interference Normal interference, weak interference; adjusting base station transmit power of the first network side according to the OI. The apparatus according to claim 20, wherein the adjusting unit comprises: a power adjustment subunit, configured to: when the OI indicates weak interference or normal interference, the base station on the first network side decreases the CRS transmission power; The format adjustment subunit is configured to: when the OI indicates strong interference, the first network side base station does not enable support for full downlink subframe format transmission, and/or modify the subframe format. A computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the method of any one of claims 1 to 15.

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