WO2016133438A1

WO2016133438A1 - First network node, second network node, first wireless device and methods therein, for determining a prediction of an interference

Info

Publication number: WO2016133438A1
Application number: PCT/SE2015/050190
Authority: WO
Inventors: Steven Corroy; Jing Fu
Original assignee: Telefonaktiebolaget Lm Ericsson (Publ)
Priority date: 2015-02-19
Filing date: 2015-02-19
Publication date: 2016-08-25

Abstract

Method performed by a first network node (111) for determining a prediction of an interference caused by a first wireless device (131) to a second cell (122) served by a second network node (112). The first network node (111) obtains a first information comprising one or more of: a measurement of a downlink channel quality from the second network node (112), a measurement of an uplink channel quality from the first wireless device (131); historical information on uplink interference by the first wireless device (131), on the second network node (112), and a current transmission power of the first wireless device (131). The first network node (111) obtains, based on the obtained first information, a first prediction of an interference caused by the first wireless device (131) to the second cell (122) and sends an indication to the second network node (112) of the obtained first prediction.

Description

FI RST NETWORK NODE, SECOND NETWORK NODE, FIRST WI RELESS DEVICE AND METHODS THEREIN, FOR DETERMINING A PREDICTION OF AN

INTERFERENCE

TECHNICAL FI ELD

The present disclosure relates generally to a first network node and a second network node and methods therein for determining a prediction of an interference caused by a first wireless device to a second cell served by the second network node. The present disclosure also relates generally to a first wireless device and methods therein for using a transmission power. The present disclosure further relates generally to computer programs and computer-readable storage mediums, having stored thereon the computer programs to carry out these methods.

BACKGROUND

Communication devices such as terminals are also known as e.g. User Equipments (UE), wireless devices, mobile terminals, wireless terminals and/or mobile stations.

Terminals are enabled to communicate wirelessly in a cellular communications network, also referred to as wireless communication system, cellular radio system or cellular network. The communication may be performed e.g. between two terminals, between a terminal and a regular telephone and/or between a terminal and a server via a Radio Access Network (RAN) and possibly one or more core networks, comprised within the cellular communications network.

Terminals may further be referred to as mobile telephones, cellular telephones, laptops, or surf plates with wireless capability, just to mention some further examples. The terminals in the present context may be, for example, portable, pocket-storable, handheld, computer-comprised, or vehicle-mounted mobile devices, enabled to communicate voice and/or data, via the RAN, with another entity, such as another terminal or a server.

The cellular communications network covers a geographical area which is divided into cells, wherein each cell being served by an access node such as a base station, e.g. a Radio Base Station (RBS), which sometimes may be referred to as e.g. "eNB",

"eNodeB", "NodeB", "B node", or BTS (Base Transceiver Station), depending on the technology and terminology used. The base stations, based on transmission power and thereby also cell size, may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station. A cell is the geographical area where radio coverage is provided by the base station at a base station site. One base station, situated on the base station site, may serve one or several cells. Further, each base station may support one or several communication technologies. The base stations communicate over the air interface operating on radio frequencies with the terminals within range of the base stations. In the context of this disclosure, the expression Downlink (DL) is used for the transmission path from the base station to the wireless device. The expression Uplink (UL) is used for the transmission path in the opposite direction i.e. from the wireless device to the base station.

In 3^rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), base stations, which may be referred to as eNodeBs or even eNBs, may be directly connected to one or more core networks.

3GPP LTE radio access standard has been written in order to support high bitrates and low latency both for uplink and downlink traffic. All data transmission is in LTE controlled by the radio base station.

Channel quality estimation in LTE

In LTE the channel quality may be monitored constantly in order to process important functionalities like scheduling, handover or link adaptation.

In the DL, the eNodeB may send regularly a Cell specific Reference Signal (CRS) that may be measured by the UE to derive its channel quality. The eNodeB may also send a Channel State Information (CSI) Reference Signal (CSI-RS) on a less frequent basis to explicitly require information about the UE DL quality. The UE may report the

measurement to the eNodeB. The report may be wideband, i.e., a CSI for the whole bandwidth or subband level, i.e., containing detailed information for each subband.

Similarly in the UL, the UE may send periodically a Sounding Reference Signal (SRS) that may be measured by the eNodeB to derive the CSI of the UE.

Based on measurements, a channel quality indicator, an integer value, may be calculated that points to a row on the Modulation and Coding Scheme (MCS). An example of such a Channel Quality Indicator (CQI) to MCS mapping is given in Table 1.

UE Transmission (TX) power control in the UL

In the UL, the UEs may change their transmit power. The reason may be that the achieved rate is insufficient or that the interference level is too high. To modify this transmit power, the eNodeB may send a power control command in each DL assignment. This command may only change the transmit power iteratively from one step, typically:

-1 , 0, +1 , +3 deciBels (dB).

The algorithm deciding how to change the transmit power is not standardized. Tabie 7.2.3- 1 4-bit CQi Tabfe

Table 1 Example of CQI to MCS mapping

Existing methods for UE TX power control in the UL cause, however, disturbances of communications in nearby cells due to the increased interference they may create.

SUMMARY

It is an object of embodiments herein to improve the performance in a wireless communications network by improving the usage of resources in communications involving wireless devices.

According to a first aspect of embodiments herein, the object is achieved by a method performed by a first network node for determining a prediction of an interference caused by a first wireless device to a second cell. The first wireless device is served by the first network node. The second cell is served by a second network node. The first wireless device is in the radio coverage of the second network node. The first network node, the second network node and the first wireless device operate in a wireless communications network. The first network node obtains a first information comprising one or more of: a) a measurement of a DL channel quality from the second network node, which measurement has been performed by the first wireless device; b) a measurement of an UL channel quality from the first wireless device, which measurement is performed by the first network node; c) historical information on UL interference by the first wireless device, the uplink interference having been experienced by the second network node, and d) a current transmission power of the first wireless device. The first network node obtains, based on the obtained first information, a first prediction of an interference caused by the first wireless device to the second cell in a first time period. The first network node sends an indication to the second network node, the indication indicating the obtained first prediction.

According to a second aspect of embodiments herein, the object is achieved by a method performed by the second network node for determining the prediction of the interference caused by the first wireless device to the second cell. The second cell is served by the second network node. The first wireless device is in the radio coverage of the second network node. The first wireless device is served by the first network node. The first network node, the second network node and the first wireless device operate in the wireless communications network. The second network node obtains historical information on UL interference by the first wireless device, the UL interference having been experienced by the second network node. The second network node obtains the first prediction of the interference caused by the first wireless device to the second cell in the first time period. The obtaining of the first prediction is based on: the obtained historical information and a first information. The first information comprises one or more of: a) the measurement of the DL channel quality from the second network node, which measurement has been performed by the first wireless device; b) the measurement of the UL channel quality from the first wireless device, which measurement is performed by the first network node; and c) the current transmission power of the first wireless device.

According to a third aspect of embodiments herein, the object is achieved by a method performed by the first wireless device for using a transmission power. The first wireless device is served by the first network node. The first wireless device is in the radio coverage of the second network node. The first network node, the second network node and the first wireless device operate in the wireless communications network. The first wireless device sends, to the first network node, the measurement of the DL channel quality from the second network node, which measurement is performed by the first wireless device. The first wireless device receives, from the first network node, an instruction to use a transmission power. The transmission power has been determined by the first network node based on the prediction of the interference caused by the first wireless device to the second cell served by the second network node. The prediction is based on the sent measurement. The first wireless device uses the transmission power as instructed by the first network node.

According to a fourth aspect of embodiments herein, the object is achieved by a first network node configured to determine the prediction of the interference caused by the first wireless device to the second cell. The first wireless device is configured to be served by the first network node. The second cell is configured to be served by the second network node. The first wireless device is in the radio coverage of the second network node. The first network node, the second network node and the first wireless device are configured to operate in the wireless communications network. The first network node is further configured to obtain a first information comprising one or more of: a) the measurement of the DL channel quality from the second network node, which measurement is configured to have been performed by the first wireless device; b) the measurement of the UL channel quality from the first wireless device, which measurement is configured to be performed by the first network node; c) the historical information on UL interference by the first wireless device, the UL interference being configured to be have been experienced by the second network node; and c) the current transmission power of the first wireless device. The first network node is further configured to obtain, based on the first information configured to be obtained, the first prediction of the interference caused by the first wireless device to the second cell in the first time period. The first network node is further configured to send the indication to the second network node. The indication indicates the obtained first prediction.

According to a fifth aspect of embodiments herein, the object is achieved by a second network node configured to determine the prediction of the interference caused by the first wireless device to the second cell. The first wireless device is configured to be served by the first network node. The second cell is configured to be served by the second network node. The first wireless device is in the radio coverage of the second network node. The first network node, the second network node and the first wireless device are configured to operate in the wireless communications network. The second network node is further configured to obtain historical information on UL interference by the first wireless device. The UL interference is configured to have been experienced by the second network node. The second network node is further configured to obtain the first prediction of the interference caused by the first wireless device to the second cell in the first time period. The obtaining of the first prediction is based on the historical information configured to be obtained and the first information. The first information comprises one or more of: a) the measurement of a DL channel quality from the second network node, which measurement is configured to have been performed by the first wireless device; b) the measurement of an UL channel quality from the first wireless device, which measurement is configured to be performed by the first network node; and c) the current transmission power of the first wireless device. According to a sixth aspect of embodiments herein, the object is achieved by a first wireless device configured to use a transmission power. The first wireless device is configured to be served by the first network node. The first wireless device is in the radio coverage of the second network node. The first network node, the second network node and the first wireless device are configured to operate in the wireless communications network. The first wireless device is further configured to send, to the first network node, the measurement of the DL channel quality from the second network node, which measurement is configured to be performed by the first wireless device. The first wireless device is further configured to receive, from the first network node, the instruction to use the transmission power. The transmission power is configured to have been determined by the first network node based on the prediction of the interference caused by the first wireless device to the second cell. The second cell is configured to be served by the second network node. The prediction is based on the sent measurement. The first wireless device is further configured to use the transmission power as instructed by the first network node.

By obtaining the first prediction of the interference caused by the first wireless device to the second cell, the first network node may take one or more actions to manage the interference caused by the first wireless device, so that the performance of the wireless communications network is not affected negatively. For example, the first network node may itself control the transmission power of the first wireless device to for example, reduce the interference caused to the second cell. The first network node also sends an indication of the first prediction to the second network node. By doing so, the second network node may also take action to manage the interference caused by the first wireless device, so that the performance of the wireless communications network is not affected negatively. For example, the second network node may avoid scheduling one or more wireless devices it serves in the radio resources experiencing interference from the first wireless device.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of embodiments herein are described in more detail with reference to the accompanying drawings, in which:

Figure 1 is a schematic diagram illustrating a problem of UL interference addressed by embodiments herein. Figure 2 is a schematic diagram illustrating embodiments in a wireless communications network, according to some embodiments.

Figure 3 is a schematic diagram illustrating embodiments of a method in a first network node, according to some embodiments.

Figure 4 is a schematic diagram of bandwidth sharing for power control, according to some embodiments.

Figure 5 is a schematic diagram illustrating embodiments of a method in a first network node, according to some embodiments.

Figure 6 is a schematic diagram illustrating embodiments of a method in a wireless

communications network, according to some embodiments.

Figure 7 is a schematic diagram illustrating embodiments of a method in a wireless

communications network, according to some embodiments.

Figure 8 is a schematic diagram illustrating embodiments of a method in a first network node and in a second network node, according to some embodiments.

Figure 9 is a schematic diagram illustrating embodiments of a method in a second

network node, according to some embodiments.

Figure 10 is a schematic diagram illustrating embodiments of a method in a first wireless device, according to some embodiments.

Figure 1 1 is a schematic block diagram illustrating embodiments of a first network node, according to embodiments herein.

Figure 12 is a schematic block diagram illustrating embodiments of a second network node, according to embodiments herein.

Figure 13 is a schematic block diagram illustrating embodiments of a first wireless device, according to embodiments herein.

DETAI LED DESCRI PTION

As part of the solution according to embodiments herein, one or more problems associated with existing systems will first be identified and discussed.

When an eNodeB schedules its UEs in the UL, it does not know the U L

interferences that these UEs will cause to its neighboring cells. I n addition, its neighboring cells may schedule their U Es U L and cause UL interferences to this cell. If neighboring cells cause U L interferences with one another, it may result in poor performance of the wireless communications network. The interference in the UL may be based on the channel quality of a UE and its transmit power. Thus, UL channel quality estimation for UEs has possible applications in neighboring cells. If an eNodeB could know the interference level of UEs in other cells, it could improve its UL scheduling and its power control algorithm. Also, in current LTE networks, the power control of the UE TX power by eNodeBs in the UL does not consider the interference caused to neighboring eNodeBs. Therefore, resource scheduling may be very suboptimal, for example scheduling two geographically close UEs served by different cells on the same resource blocks will cause significant interferences to other UEs, thus preventing decoding of information.

The problem of uplink interference prediction to be solved by embodiments herein is illustrated in Figure 1. For simplicity, the system is described with two nodes and one UE but embodiments herein apply to any number of nodes or UE. Consider a UE is served by eNodeB A and is scheduled in the UL direction. In the current setup, it is not possible for eNodeB B to know the UL interference that it will suffer from this UE.

In embodiments herein, a TX power control algorithm for UEs in the UL is provided. This algorithm may be based on the knowledge of interference that the neighboring eNodeBs will generate with their served UEs UL. Using this information, the eNodeB may choose a TX power that gives a tradeoff between a sufficient TX power for achieving a good throughput and a low enough TX power to minimize the amount of interference caused to the neighboring cells.

Embodiments herein address the foregoing problems by providing a method to provide each eNodeB with the knowledge of UL interference caused by UEs situated in other cells. In particular, embodiments herein may use the UE DL Reference Signal

Received Power (RSRP) measurements from neighboring cells, and the transmit power for each UE in UL scheduling, to predict the interference to the neighboring cells that may be caused by scheduling a particular UE. This prediction may be sent to the neighboring cells and therefore each cell may know potential UL interferences from all its neighbors. Finally, historical interference data from neighboring eNodeBs may be used as ground truth to make more accurate predictions. Ground truth may be understood as the measured interference data from neighboring eNodeBs.

Therefore, embodiments herein may relate to UL interference prediction. Based on signal measurements and historical interference data, embodiments herein may predict the level of interference experienced by eNodeBs in the UL from UEs served by other eNodeBs. This prediction may enable efficient scheduling and power control.

As mentioned above, embodiments herein may also provide a power control algorithm to further optimize the network performance. Embodiments herein may therefore relate to UL power control in LTE cellular networks. The power control algorithm may be based on interference knowledge of interference of served UEs in the U L to other eNodeBs. Embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which examples of the claimed subject matter are shown. The claimed subject matter may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the claimed subject matter to those skilled in the art. It should also be noted that these embodiments are not mutually exclusive. Components from one embodiment may be tacitly assumed to be present/used in another embodiment.

Note that although terminology from 3GPP LTE has been used in this disclosure to exemplify the embodiments herein, this should not be seen as limiting the scope of the embodiments herein to only the aforementioned system. Other wireless systems, including WCDMA, WiMax, UMB and GSM, may also benefit from exploiting the ideas covered within this disclosure. Thus, also note that terminology such as eNodeB and UE should be considering non-limiting. Figure 2 depicts a wireless communications network 100 in which embodiments herein may be implemented. The wireless communications network 100 may for example be a network such as a Long-Term Evolution (LTE), e.g. LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), LTE Half-Duplex Frequency Division Duplex (HD-FDD), LTE operating in an unlicensed band, Wideband Code Division Multiple Access (WCDMA), Universal Terrestrial Radio Access (UTRA) TDD, Global System for

Mobile communications (GSM) network, GSM/Enhanced Data Rate for GSM Evolution (EDGE) Radio Access Network (GERAN) network, EDGE network, network comprising of any combination of Radio Access Technologies (RATs) such as e.g. Multi-Standard Radio (MSR) base stations, multi-RAT base stations etc., any 3rd Generation Partnership Project (3GPP) cellular network, WiFi network, Worldwide Interoperability for Microwave Access (WiMax), 5G system or any cellular network or system.

The wireless communications network 100 comprises a first network node 11 1 , a second network node 112, and one or more third network nodes 113. Each of the first network node 1 1 1 , the second network node 112, and the one or more third network nodes 113 may be a base station such as e.g. an eNB, eNodeB, or a Home Node B, a Home eNode B, femto Base Station, BS, or any other network unit capable to serve a wireless device or a machine type communication device in the wireless communications network 100. Each of the first network node 1 1 1 , the second network node 1 12, and the one or more third network nodes 1 13 may be e.g. macro eNodeB, or pico base station, based on transmission power and thereby also cell size. In some particular embodiments, each of the first network node 1 11 , the second network node 1 12, and the one or more third network nodes 1 13 may be a stationary relay node or a mobile relay node. The wireless communications network 100 covers a geographical area which is divided into cells, wherein each cell is served by a network node, although, one network node may serve one or several cells. In the example depicted in Figure 2, the first network node 1 1 1 serves a first cell 121 , the second network node 112 serves a second cell 122, and the one or more third network nodes 1 13 each serve a third cell 123. In Figure 2, only one third network node 1 13 serving the third cell 123 is represented for the sake of simplicity.

Typically, the wireless communications network 100 may comprise more cells similar to the cell 120, served by their respective network nodes. This is not depicted in Figure 2 for the sake of simplicity. The network node 1 10 may support one or several communication technologies, and its name may depend on the technology and terminology used.

A number of wireless devices are located in the wireless communications network 100. In the example scenario of Figure 2, only some wireless devices are shown: a first wireless device 131 , a second wireless device 132, and third wireless devices 133. Only one of the third wireless devices 133 is represented to simplify the Figure.

Each of the first wireless device 131 , the second wireless device 132, and the third wireless devices 133 is a wireless communication device such as a UE which is also known as e.g. mobile terminal, wireless terminal and/or mobile station, a mobile telephone, cellular telephone, or laptop with wireless capability, just to mention some further examples. Each of the first wireless device 131 , the second wireless device 132, and the third wireless devices 133 in the present context may be, for example, portable, pocket-storable, hand-held, computer-comprised, or vehicle-mounted mobile devices, enabled to communicate voice and/or data, via the RAN, with another entity, such as a server, a laptop, a Personal Digital Assistant (PDA), or a tablet computer, sometimes referred to as a surf plate with wireless capability, Machine-to-Machine (M2M) devices, devices equipped with a wireless interface, such as a printer or a file storage device, modems, or any other radio network unit capable of communicating over a radio link in a cellular communications system. Each of the first wireless device 131 , the second wireless device 132, and the third wireless devices 133 is wireless, i.e., it is enabled to communicate wirelessly in the wireless communication network 100, sometimes also referred to as a cellular radio system or cellular network. The communication may be performed e.g., between two devices, between a device and a regular telephone and/or between a device and a server. The communication may be performed e.g., via a RAN and possibly one or more core networks, comprised within the wireless communications network 100.

The first wireless device 131 may communicate with the first network node 211 over a first link 141 , the second wireless device 132 may communicate with the second network node 211 over a first link 142, and the third wireless devices 133 may each communicate with the respective third network node 1 13 over a third link 143. The first wireless device 131 may receive communications from the second network node 132 over a fourth link 144. Each of the first network node 111 , the second network node 1 12, and the one or more third network nodes 113 may communicate with each other with a respective link, which is not illustrated in Figure 2 to simplify it.

Embodiments of a method performed by the first network node 111 for determining a prediction of an interference caused by the first wireless device 131 to the second cell 122, will now be described with reference to the flowchart depicted depicted in Figure 3. The first wireless device 131 is served by the first network node 111 , and the second cell 122 is served by the second network node 1 12. The first wireless device 131 is in the radio coverage of the second network node 1 12. The first network node 111 , the second network node 1 12 and the first wireless device 131 operate in the wireless

communications network 100. Figure 3 depicts a flowchart of the actions that are or may be performed by the first network node 111 in embodiments herein. A dashed line depicts an optional action. The method may comprise the following actions, which actions may as well be carried out in another suitable order than that described below.

Action 301

In order to predict the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , the first network node 1 1 1 may first gather information that may be needed to obtain such a prediction. Any reference herein to an interference to the second network node 1 12 is understood to refer to an interference to the second cell 122.

User data collection: The first network node 1 11 and the second network node 1 12 may be sending DL CRS. Typically, the first wireless device 131 may monitor the CRS of all neighboring cells for handover purposes. However, normally, it may only report the measured CSI to the serving cell, the first cell 121. According to embodiments herein, the first wireless device 131 may collect the CSI of neighboring nodes and transmit this information to the serving base stations using the Physical Uplink Control CHannel (PUCCH), i.e. , the serving base station may know not only its DL CSI but also the ones of all other neighboring cells. The reporting of CSI to the base station may be a wideband report, to save data traffic, or a subband level report, for more precision, as illustrated in Table 2.

Table 2 Example wideband and subband level CSI reports transmitted to the serving first network node 111 EnodeB data collection: The serving first network node 11 1 , represented in some of the figures as the eNodeB A, may collect the CSI for each UE for all neighboring base stations as described in above in the section "User data collection". It may also collect the periodic sounding reference signal, every 2 milliseconds (ms) to 160ms, depending on UE configuration, for each UE. From the X2 interface, the first network node 1 11 may also receive the historical data form neighboring base stations of suffered interference as detailed in the section "Prediction transmission from eNodeB to eNodeB". Therefore, the first network node 1 1 1 may e.g. , collect the following information for each UE: a) DL CSI for all neighboring base station, b) UL CSI , c) Historical interference data for a neighboring base station, such as the second network node 1 12, and d) Current transmit power of the first wireless device 131.

According to the above, in this action, the first network node 11 1 obtains a first information comprising one or more of:

^■ a measurement of a DL channel quality from the second network node 1 12, which measurement has been performed by the first wireless device 131 . The DL channel quality may be for example an RSRP measurement or an Reference Signal Received Quality (RSRQ) measurement;

^■ a measurement of an UL channel quality from the first wireless device 131 , which measurement is performed by the first network node 1 11. The UL channel quality may be for example a CQI measurement;

^■ historical information on UL interference by the first wireless device 131 , the UL interference having been experienced by the second network node 112, and

^■ a current transmission power of the first wireless device 131.

First information is a term used herein to refer to information having a description corresponding to that just provided.

The first network node 11 1 may obtain the first information by receiving at least some of it from for example the second network node 1 12 or from the first wireless device 131 .

In some embodiments for example, the historical information on UL interference by the first wireless device 131 is received from the second network node 112 through an X2 interface.

The first network node 1 1 1 may also obtain at least some of the first information by autonomously determining it.

In some embodiments, the first information is obtained per radio frequency sub- band.

Action 302

Once the required information has been gathered to predict the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , the first network node 1 1 1 , in this action, obtains, based on the obtained first information, a first prediction of an interference caused by the first wireless device 131 to the second cell 122 in a first time period.

The first network node 111 may obtain the first prediction by autonomously determining it. The first network node 111 may also obtain the first prediction by receiving it from another node, such as, for example, from the second network node 1 12.

In some embodiments, the first prediction is obtained per radio frequency sub-band.

Uplink interference prediction: Given the input described in the Action 301 , the first network node 11 1 may use machine learning to predict the UL interference of its served UEs with respect to the neighboring eNodeBs. The prediction may be done per subband. The goal of this module is to develop a model that may map the parameters described in the section "EnodeB data collection" to the suffered interference on each subband. This module may comprise two distinct phases, the training phase and the prediction phase.

Training phase: In this phase, the first network node 11 1 may not be delivering any prediction to the second network node 112, it may simply record the data set, called feature set, described in the section "EnodeB data collection", for each Transmission Time Interval (TTI). It may then get feedback after a TX TTI has been processed from the second network node 112, on which level of interference it experienced. The first network node 111 may thus have a tuple of data, such as feature set, interference. When the first network node 11 1 has collected enough data, it may develop a model, i.e., a function that predicts interference level based on the feature set. We detail next the format of the feature set, the predicted interference and the learning algorithm.

Feature Set: An exemplary feature set for one UE, such as the first wireless device 131 , is presented in Table 3. For every subband, the UL CQI to the first network node 111 is shown in column a, the DL CQI to the second network node 1 12 is shown in column b, the historical interference information is shown in column c in dB, and the TX power of the first wireless device 131 is shown in column d.

Predicted interference: The target variable learned by the machine learning algorithm is the interference caused by each UE to the second network node 112 on each of the frequency subbands. In other words, for M UEs and N subbands, M*N values may be learned. In order to develop the model during the training phase, the first network node 111 may need to know the ground truth of interference from the second network node 112. This is described in the section "Comparison of prediction and ground truth".

Learning algorithm: The input features may be mapped to the measured interference level in order to develop a prediction model. The algorithm used in order to produce the prediction model may be very diverse. A selection of possible methods may comprise: linear regression, neural networks, Support Vector Machine (SVM), and Random forest.

historical interference information

Table 3. Feature set

Prediction phase: After the training phase, a model may have been developed. During the prediction phase, this model may be used to predict the level of interference at the second network node 112.

Action 303

In order to provide for an improved prediction of the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , in this action, the first network node 11 1 may obtain an estimation of a transmission power of the first wireless device 131 in a second time period, as described later. The obtaining of the estimation may be based on the current transmission power of the first wireless device 131. UE Transmit power estimation: The time of the prediction of the first network node 111 , the first time period, may not be the time of the reception of the prediction by the second network node 112, for example, because the X2 interface is slow. If this is the case, it may be possible to predict what will be the interference in a short delay of N TTIs if it is assumed that the same UEs will approximately be scheduled on the same subbands, which may be assumed since the channel conditions may not change so drastically.

As explained in the background section, the first wireless device 131 may have a current transmit power level on each of the resource blocks. The first network node 1 11 may change this level of power iteratively by sending a power control command. The current power level P may be updated from

-1 , 0, +1 or +3 dB.

Using this fact, the worst case transmit power estimation may be used to compute the possible change in the transmit power of the first wireless device 131 that may occur in the second time period, for example, in the next N TTIs. This module may calculate the following values, wherein Pmin is the estimated minimum transmit power, and Pmax is the estimated maximum transmit power:

Pmin = P + N*(-1) = P-N

Pmax = P+N*(3) = P+3N

This module may also use a probabilistic model to calculate an average transmit power, Pavg, in N TTIs, using the Table 4.

The probabilities in Table 4 may be fixed by the operator, but they may also be learned from historical data using logistic regression.

Table 4 Probability distribution of power changes

Action 304

Once the transmission power of the first wireless device 131 has been estimated, the first network node may obtain a second prediction of an interference caused by the first wireless device 131 to the second cell 122 in the second time period. The obtaining of the second prediction is based on the obtained estimation of the transmission power and the obtained first prediction. The second prediction may also be referred to as a statistical UL interference prediction. Statistical uplink interference prediction: In this action 304, the first network node 1 1 1 may take as input the UL interference prediction described in above in section "Uplink interference prediction" and the transmit power estimation described in the section "UE Transmit power estimation". The first network node 1 1 1 may know the prediction of interference I for the current transmit power level P. The goal of this action 304 may be understood as to derive a prediction for Pmin, Pmax and Pavg. Several methods may be used to derive these predictions. The prediction may be simply increased or decreased depending on the difference between P and Pmax for example. In general, the situation may be modelled as:

I = H*P where H represents the channel gain for one user on one specific subband. In other words, in dB the interference I may be expressed as:

Taking the example of Pmax, estimate Imax may be estimated as: lmax_dB = H_dB + Pmax_dB

H_dB + PdB + (PmaxdB - PdB) l_dB + PmaxdB - PdB

In that way, for each UE and each subband a worst-case prediction may be provided to the second network node 1 12 without testing all possible power variations for each UE.

In some embodiments, the second prediction is obtained per radio frequency sub- band. Action 305

Once the first network node 1 1 1 has obtained the first prediction and/or the second prediction, it may inform the victim network node, that is, the network node that may be experiencing the interference caused by the first wireless device 131 about the predicted interference values, which in this case is the second network node 1 12. This may then enable the second network node 1 12 to take action to minimize the effects of the interference, by e.g., considering the predicted interference when scheduling the wireless devices it serves, avoiding the interfered channel. Thus, in this action, the first network node 1 1 1 may send an indication to the second network node 112, the indication indicating the obtained first prediction. In some embodiments, the sent indication is further based on the second prediction. The indication may be sent by, e.g. , through the X2 interface.

Prediction transmission from eNodeB to eNodeB: The prediction of interference level may be aggregated on a subband level by adding up the interference caused by each UE, and may then be transmitted to the second network node 1 12 possibly on an X2 interface or a proprietary interface.

The second network node 1 12 may receive the prediction from the first network node 1 1 1 and may act on it for improving its own scheduling or power control decisions. Action 306

To further improve the prediction of the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , the first network node 1 11 may adjust the prediction based on information received from the second network node 112 on the interference that has actually been experienced by the second network node 112, also referred to herein as the "ground truth", as well as the total interference predicted to be suffered by the second network node 1 12 by other neighbouring nodes.

Comparison of prediction and ground truth: During the training phase, the first network node 1 1 1 may need to know the ground truth from the second network node 1 12 and may also need the measured interference as historical data. After each TTI , the second network node 1 12 may transmit the measured interference on each subband to the first network node 1 1 1. Since the first network node 1 1 1 knows which UEs were scheduled on which subband it may derive, which UE has caused which level of interference to the second network node 1 12. This information may be sent on the X2 interface.

Thus, in this action, the first network node 1 11 may obtain, from the second network node 1 12: a) a measured total UL interference to the second cell 122 for a frequency band used by the first wireless device 131. The total U L interference has been measured by the second network node 112 in the frequency band, and the total UL interference has been measured in one of: the first time period and the second time period; and/or b) one or more third predictions of an UL interference caused by the third wireless devices 133 served by the respective one or more third network nodes 1 13 to the second cell 122. Each of the one or more third predictions has been determined, respectively, by each of the one or more third network nodes 1 13.

The one or more third predictions of an UL interference caused by the third wireless devices 133 served by the respective one or more third network nodes 113 to the second cell 122 are described in below in the "Interference estimation messages between neighboring eNodeBs" and "Received Interference estimation from neighboring eNodeBs per subband". Interference estimation messages between neighboring eNodeBs: The neighboring eNodeBs, such as the first network node 11 1 and the second network node 1 12, may send interference estimation messages to each other periodically. Either a message contains interference estimation for each TTI, or the message may include interference estimation for a number of TTIs. For each TTI, the interference for each subband may need to be estimated. An interference estimation message from the first network node 1 11 to the second network node 1 12 containing the estimated interference to the second network node 1 12 is exemplified in Table 5.

Received Interference estimation from neighboring eNodeBs per subband: Each eNodeB may receive interference estimation messages from a number of its neighboring eNodeBs. For each TTI , the received interference estimation from neighbouring eNodeBs may be collected, as shown in Table 6. In addition, the aggregated interference for each subband may be computed. As the interferences are in dB and log scale, thus a simplified aggregation may be to use the max of all its neighboring estimations. Of course, a more exact formula to aggregate may be used.

Table 6. Interference from neighboring eNodeBs Action 307

Once the measured interference and the total predicted interference has been obtained from the second network node 1 12 in action 306, in this action, the first network node 1 1 1 may adjust at least one of: the obtained first prediction and the obtained second prediction, based on at least one of: the obtained measured total UL interference and the one or more third predictions. For example, in this action, the first network node 1 11 may modify one or more parameters used to obtain the first prediction, according to the obtained measured total UL interference and the one or more third predictions. Action 308

In some embodiments, it may be the second network node 112 that does the prediction of the interference to the second cell 122 that may be caused by scheduling the first wireless device 131. For these embodiments, in this action, the first network node 11 1 may send, to the second network node 1 12: a) the measurement of a DL channel quality from the second network node 1 12, which measurement has been performed by the first wireless device 131 ; and b) the current transmission power of the first wireless device 131. This action may be performed by sending an X2 message to the second network node 1 12 comprising the information listed as a) and b) in this action. Action 309

In order to manage or control the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , the first network node 1 11 , may control transmission power of the first wireless device 131. The first network node 1 11 may determine a transmission power to be used by the first wireless device 131 , but in order to do that, it may first obtain information it may need to compute such transmission power. Thus, in this action, the first network node 1 11 may obtain second information comprising one or more of: a) an interference caused by a second wireless device 132 served by the second network node 1 12 on a frequency band used by the first wireless device 131 ; b) a data rate achieved by the first network node 11 1 on the frequency band, and c) a data rate achieved by the second network node 1 12 on the frequency band. This action may be performed by receiving the second information in a message from the second network node 1 12, or from the first wireless device 131 , or by autonomous determination by the first network node 1 1 1 . Input parameters: The format of the input parameters that may be used during the input parameters collection in order to control transmission power of the first wireless device 131 may be as follows. Some of these parameters may have already been obtained in previous actions, e.g., in action 306:

Channel quality per subband: In some embodiments, the second information is obtained per radio frequency sub-band.

The interference caused by a second wireless device 132 served by the second network node 112 on the frequency band used by the first wireless device 131 listed in this action as a) may be obtained because, for each subband, the first network node 111 may collect the UE CQI using periodic SRS. One of these UEs may be, for example, the first wireless device 131. A measurement report is exemplified in Table 7.

Table 7. Channel quality reporting format Estimated interference to neighboring eNodeBs: Based on the channel quality report from the UE, e.g., the first wireless device 131 , and predicted scheduling, the first network node 111 may estimate the potential interferences for all its neighbors. This may also be done by all network nodes in the wireless communications network 100, as described earlier in Action 306. Example interference estimation information for a given TTI is shown in Table 8.

Table 8. Interference to neighboring eNodeBs

Interference estimation messages between neighboring eNodeBs, as described in action 306.

Received Interference estimation from neighboring eNodeBs per subband, as described in action 306.

Feedback of experienced rate: With regards to the data rate achieved by the first network node 11 1 on the frequency band, and the data rate achieved by the second network node 1 12 on the frequency band listed in this action as b) and c), respectively, the first network node 1 1 1 may further collect the achieved rate by its UEs on all the subbands and may send this information to the second network node 1 12. It may receive the same information from the second network node 1 12 and use both achieved rates as new input for the power control algorithm. A measurement report is exemplified in Table 9.

Action 310

In order to control the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , in this action, the first network node 1 11 may determine a transmission power to be used by the first wireless device 131 . The determining 210 of the transmission power may be based on at least one of: the obtained first prediction, the obtained second prediction, the obtained second information, the adjusted obtained first prediction, the adjusted obtained second prediction, and the obtained one or more third predictions. Any of the obtained first prediction, the obtained second prediction, and the obtained second information, may comprise information which has been autonomously determined or received from the second network node 1 12.

Depending on the type of interference calculation performed in the interference measurement calculation, all or parts of the bandwidth may be actively controlled. Thus, in some embodiments, the determined transmission power is determined by radio frequency sub-band.

Two different methods may be used to determine the transmission power to be used by the first wireless device 131 according to this action 310.

Fixed transmit power interference calculation: If the interference calculation delivers a hard interference value, i.e., assuming that a UE will use a specific transmit power, then if the power control algorithm changes the transmit power of some other UE by making use of this information, it may invalidate its own interference calculation and render the whole system invalid. In that case, the following approach illustrated in Figure

4 is proposed. Figure 4 is a schematic diagram of bandwidth sharing for power control, provided herein. According to this method, the bandwidth is shared in two: a) one (horizontal lines) where the first network node 11 1 calculates the interference that its UEs will produce to the second network node 1 12. On this portion of the bandwidth, the first network node 1 1 1 may not change the TX power of its UEs, otherwise it may invalidate its calculation; b) one (vertical lines) where the first network node 1 1 1 , received a calculation from the second network node 1 12 and does use power control to combat interference from the second network node 1 12 and minimize interference toward the second network node 1 12.

Stochastic prediction: As explained earlier, it may be possible to calculate an interference value based on a stochastic approach, i.e. , delivering a worst case prediction or an average prediction. In that case, both nodes may use power control on the whole bandwidth.

Power control algorithm: The power control algorithm that may be used in this action is an iterative algorithm making use of the already existing LTE commands. The power control algorithm is illustrated in an example in Figure 5, according to the description provided next.

First, for a specific subband i and a UE j scheduled on subband j, e.g., the first wireless device 131 , the first network node 11 1 may calculate a minimum transmit power P that enables a small enough block error rate (BER). This is referred to in Figure 5 as the "initial transmit power P". P may be calculated using the channel quality measure described under the section "Channel quality per subband". This may be the same calculation as the one processed by the the first network node 1 1 1 for link adaptation.

Then, for each new TTI, the first network node 1 1 1 may change iteratively the transmit power of UE j by adding a value δ, i.e.:

P(t+1 ) = P(t) + δ

Typically, δ may take the value -1 dB or +1 dB.

To decide the value of δ, the first network node 11 1 may have to make a tradeoff between 4 factors using feedback information received during an earlier time period, for example the last time period. Here, A represents the first network node 11 1 and B represents the second network node 1 12. The four factors may be: a) The interference l(A->B) that it may produce at the second network node 112, i.e., to minimize it δ should be negative; b) The interference l(B->A) that it may suffer from the second network node 112, i.e., to get over this interference δ should be positive; c) The achieved rate r(A) by the first network node 1 1 1 on the subband may be calculated and used as feedback information, if it is sufficient then δ may be negative or close to zero, if it is insufficient δ should be positive; d) The achieved rate r(B) by the second network node 112 on the subband may also be calculated and used as feedback information, if it is sufficient then δ may be kept to zero or slightly increased without disturbing the second network node 112, if it is insufficient δ should be negative.

Four weights may be defined that take into account this tradeoff

1. w_l(A->B) associated to l(A->B)

2. w_l(B->A) associated to l(B->A)

3. w_r(A) associated to r(A)

4. w_r(B) associated to r(B)

At each round δ may be calculated as:

δ = sign(w_l(A->B)*l(A->B) + w_l(B->A)*l(B->A) + w_r(A)*r(A) + w_r(B)*r(B)), where the sign function return 1 if its argument is positive and -1 otherwise.

Typically if

w_l(A->B) is negative and has a large magnitude, then the first network node 111 may be highly concerned with interference toward the second network node 112 and may try to avoid causing interference by decreasing its UEs' transmit power, for example, that of the first wireless device 131.

w_l(B->A) is positive and has a large magnitude, then the first network node 111 may try at all cost to get over the interference from the second network node 112 by increasing its UEs' transmit power.

w_r(A) is positive and has a large magnitude, then the first network node 111 may try to increase its rate by increasing transmit power.

w_r(B) is negative and has a large magnitude then eNodeB A is trying to help eNodeB B achieve its rate requirements.

Choosing a value for the weights is a network management problem and may be solved using many methods, as for example an iterative tuning by using the feedback from the achieved rates in each cell. Rules may be defined to change those weights if, for example, it is discovered that cell edge throughput is too low because of interference, one may lower w_l(B->A).

An example baseline for choosing those parameters may be:

w_l(A->B) = -1/I(A->B)

w_l(B->A) = 1/I(A->B)

w_r(A) = 1/r(B)

w_r(B) = -1/r(B) This baseline may allow for a balanced behavior of nodes between greedy and generous and between achieving rate targets and creating interference. For this case, δ may be calculated as:

δ = sign(l(B->A)/l(A->B) - r(A)/r(B) - 2)

The value of δ may be changed every TTI.

Action 311

In order to control the interference to the second cell 122 that may be caused by scheduling the first wireless device 131 , in this action, the first network node 1 11 may instruct the first wireless device 131 to use the determined transmission power in action 310. This may be performed, for example, by sending a DL Control Information (DCI) message to the first wireless device 131 comprising the instruction.

To simplify the readability, embodiments herein are summarized in an example illustrated in Figure 6. First, the first wireless device 131 measures the DL channel quality from the neighboring cells such as the second cell 122 of the second network node 1 12, represented in Figure 6 as eNodeB B, through for example an RSRP measurement. The first wireless device 131 may do this by using the CRS reference sounding signal. This is represented as step 1 in Figure 6. The measured DL channel quality in eNodeB B is sent to the first network node 11 1 , represented in the Figure as eNodeB A. This is represented as step 2 in Figure 6. The first wireless device 131 may also send the UL CQI with the first network node 1 11.

Next, eNodeB A uses this information to predict the UL channel quality of the user to eNodeB B. This is represented as step 3 in Figure 6. It then calculates an interval of possible future transmit power for the user based on the UL channel quality to eNodeB A and combine this information with the predicted channel quality to derive a prediction of the interference. This interference prediction is then sent to eNodeB B. This is

represented as step 4 in Figure 6. After each TTI, eNodeB B sends back to eNodeB A the real interference it has suffered on each resource blocks. This is represented as step 5 in Figure 6. It enables eNodeB A to use this information as 1) ground truth to build the prediction model and 2) as historical data to have a better prediction quality.

Figure 7 is a schematic representation of some aspects of embodiments herein to summarize how the first network node 11 1 may predict the potential UL interference from the first wireless device 131 , according to the description of actions 301-307 just provided. Figure 8 is a schematic representation of an example some aspects of

embodiments herein to summarize how the first network node 11 1 may control the TX power of the first wireless device 131 , according to the description of actions 301-311 just provided.: 1. Interference estimation and prediction: First, the first network node 11 1 may estimate the interference that the first wireless device 131 will produce to the second network node 112 on each of its frequency subbands. This may be realized, for example, using the method described in actions 301 and 302. The first network node 11 1 may send this estimation to the second network node 112, as described in action 305. 2. Input parameter collection: the first network node 1 11 may collect all necessary inputs for the power control algorithm, as described in action 309. This input parameters may be: a) the interference caused to the second network node 1 12 estimated in the previous step, b) the interference suffered from the second network node 112 estimated at the second network node 112 and transmitted to the first network node 11 1 , c) the channel quality of the first network node 111 on its subbands of all its UEs, and d) the feedback of achieved throughput on its subbands for different UEs. 3. Power control: based on the input parameters, and the learned knowledge, the first network node 11 1 decides which transmit power will be used by each UEs served by the first network node 111 , as described in action 310. 4. Feedback: the first network node 11 1 may gather the achieved rate of its UEs on each subband and send this information to the second network node 112. Symmetrically, it may receive a similar information from the second network node 112. It may further loop back this information to the input parameter collection module for future power control. An advantage of embodiments herein is that they enable eNodeBs to predict the potential UL interferences from its neighbouring cells, and they may be used to control the scheduling of UEs in the UL to avoid interference for themselves and other eNodeB. More specifically, embodiments herein may enable the eNodeB to control the transmit power of its UEs to improve overall network performance.

Another advantage of embodiments herein is that they enable eNodeBs to control the TX power of UEs to maximize the overall performance of the network. The system tries to achieve a good tradeoff among achieved throughput and interferences that it will cause to neighbor cells. Embodiments of a method performed by the second network node 1 12 for determining the prediction of the interference caused by the first wireless device 131 to the second cell 122, will now be described with reference to the flowchart depicted depicted in Figure 9. The first wireless device 131 is served by the first network node 1 11 , and the second cell 122 is served by the second network node 112. The first wireless device 131 is in the radio coverage of the second network node 1 12. The first network node 1 1 1 , the second network node 1 12 and the first wireless device 131 operate in the wireless communications network 100. Figure 9 depicts a flowchart of the actions that are or may be performed by the second network node 1 12 in embodiments herein. A dashed line depicts an optional action.

The method may comprise the following actions, which actions may as well be carried out in another suitable order than that described below. In some embodiments, the second network node 112 may perform all actions, whereas in other embodiments, some actions may be performed. In some embodiments, the order of the actions illustrated in Figure 9 may be changed in one or more actions. The optional actions are indicated. One or more embodiments may be combined, where applicable. All possible combinations are not described to simplify the description. The detailed description of some of the following corresponds to the same references provided above, in relation to the actions described for the first network node 11 1 , and will thus not be repeated here.

Action 901

In this action, the second network node 112 obtains historical information on UL interference by the first wireless device 131 , the UL interference having been experienced by the second network node 112. The second network node 112 may obtain this information by measuring the UL interference in e.g. per radio frequency sub-band.

In some embodiments, the historical information on uplink interference by the first wireless device 131 is sent to the first network node 1 11 through an X2 interface.

Action 902

In some embodiments wherein the second network node 1 12 may itself determine the prediction of interference caused by the first wireless device 131 to the second cell 122 in the first time period, the second network node 1 12 may receive the first information from the first network node 1 11 , as described above for Action 301. This may be done e.g. , by receiving an X2 message from the first network node 1 1 1 comprising the first information. Action 903

In this action, the second network node 112 obtains a first prediction of the interference caused by the first wireless device 131 to the second cell 122 in the first time period, similarly to the way it was described for the first network node 1 11 in action 302. Thus, the obtaining of the first prediction may be based on: the obtained historical information and the first information. The first information may comprise one or more of: a) a measurement of a DL channel quality from the second network node 1 12, which measurement has been performed by the first wireless device 131 ; b) a measurement of an UL channel quality from the first wireless device 131 , which measurement is performed by the first network node 1 11 ; and c) a current transmission power of the first wireless device 131.

In some embodiments, the obtaining the first prediction comprises determining the first prediction, autonomously.

In other embodiments, the obtaining the first prediction comprises receiving the indication from the first network node 11 1 , the indication indicating the first prediction, as described in action 305. Also as described earlier, in some embodiments the indication is further based on a second prediction of the interference caused by the first wireless device 131 to the second cell 122 in the second time period. The second prediction may have been obtained based on an estimation of the transmission power of the first wireless device 131 in the second time period, and on the first prediction.

Once the second network node 112 obtains the prediction, it may act on it for improving its own scheduling or for taking power control decisions. Action 904

To support the first network node 11 1 in adjusting its prediction of the interference caused by the first wireless device 131 to the second cell 122, in this action, the second network node 1 12 may obtain: a) a measured total uplink interference to the second cell 122 for a frequency band used by the first wireless device 131 , the total uplink interference having been measured by the second network node 1 12 in the frequency band, the total uplink interference having been measured in one of: the first time period and a second time period; and/or b) one or more third predictions of an uplink interference caused by third wireless devices 133 served by respective one or more third network nodes 1 13 to the second cell 122, each of the one or more third predictions having been determined, respectively, by each of the one or more third network nodes 113. This action may be performed, for example, by receiving an X2 message from the one or more third network nodes 1 13, or by autonomous determination by the second network node 1 12.

In some embodiments, any of the first information, the historical information on uplink interference by the first wireless device 131 , the first prediction, and the second prediction are obtained per radio frequency sub-band.

Action 905

To support the first network node 11 1 in adjusting its prediction of the interference caused by the first wireless device 131 to the second cell 122, in this action, the second network node 1 12 may send the obtained measured total uplink interference and the one or more third predictions to the first network node 1 1 1. This may be performed, for example, by sending an X2 message to the first network node 1 1 1.

Embodiments of a method performed by the first wireless device 131 for using a transmission power, will now be described with reference to the flowchart depicted depicted in Figure 10. The first wireless device 131 is served by the first network node 1 11 . The first wireless device 131 is in the radio coverage of the second network node 1 12. The first network node 11 1 , the second network node 1 12 and the first wireless device 131 operate in the wireless communications network 100. Figure 10 depicts a flowchart of the actions that are or may be performed by the first wireless device 131 in embodiments herein. A dashed line depicts an optional action.

The method may comprise the following actions, which actions may as well be carried out in another suitable order than that described below. In some embodiments, the first wireless device 131 may perform all actions, whereas in other embodiments, some actions may be performed. In some embodiments, the order of the actions illustrated in Figure 10 may be changed in one or more actions. The optional actions are indicated. One or more embodiments may be combined, where applicable. All possible combinations are not described to simplify the description. The detailed description of some of the following corresponds to the same references provided above, in relation to the actions described for the first network node 11 1 , and will thus not be repeated here. Action 1001

In this action, the first wireless device 131 sends, to the first network node 11 1 , the measurement of a DL channel quality from the second network node 112, which measurement is performed by the first wireless device 131. The first wireless device 131 may send the measurement to the first network node 11 1 in a PUCCH reporting message comprising the measurement.

Action 1002

In this action, the first wireless device 131 receives from the first network node 11 1 , an instruction to use a transmission power, as described in action 311 . The transmission power has been determined by the first network node 1 11 based on a prediction of the interference caused by the first wireless device 131 to the second cell 122 served by the second network node 1 12. The prediction is based on the sent measurement, in Action 1001.

Action 1003

In this action, the first wireless device 131 uses the transmission power as instructed by the first network node 1 1 1 in Action 1002.

To perform the method actions described above in relation to Figures 3-8, the first network node 1 1 1 is configured to determine the prediction of the interference caused by the first wireless device 131 to the second cell 122. The first network node 11 1 may comprise the following arrangement depicted in Figure 11 . As already mentioned, the first wireless device 131 is configured to be served by the first network node 1 1 1. The second cell 122 is configured to be served by the second network node 1 12. The first wireless device 131 is in the radio coverage of the second network node 1 12. The first network node 1 1 1 , the second network node 1 12 and the first wireless device 131 are configured to operate in the wireless communications network 100.

The detailed description of some of the following corresponds to the same references provided above, in relation to the actions described for the first network node 11 1 , and will thus not be repeated here. The first network node 11 1 is further configured to, e.g. , by means of an obtaining module 1 101 configured to, obtain the first information comprising the one or more of: a) the measurement of the DL channel quality from the second network node 112, which measurement is configured to have been performed by the first wireless device 131 ; b) the measurement of the UL channel quality from the first wireless device 131 , which measurement is configured to be performed by the first network node 1 1 1 ; c) the historical information on UL interference by the first wireless device 131 , the uplink interference configured to be have been experienced by the second network node 1 12, and d) the current transmission power of the first wireless device 131 .

The obtaining module 1 101 may be a processor 1106 of the first network node 11 1 .

The historical information on U L interference by the first wireless device 131 may be configured to be received from the second network node 112 through an X2 interface.

The first network node 11 1 is further configured to, e.g. , by means of the obtaining module 1101 configured to, obtain, based on the first information configured to be obtained, the first prediction of the interference caused by the first wireless device 131 to the second cell 122 in the first time period.

In some embodiments, the first network node 1 1 1 may be further configured to, e.g., by means of an obtaining module 1 101 configured to, obtain the estimation of the transmission power of the first wireless device 131 in the second time period, the obtaining of the estimation being based on the current transmission power of the first wireless device 131 .

The first network node 1 1 1 may also be configured to, e.g. , by means of the obtaining module 1 101 configured to, obtain the second prediction of the interference caused by the first wireless device 131 to the second cell 122 in the second time period, the obtaining of the second prediction being based on the estimation of the transmission power configured to be obtained, and the first prediction configured to be obtained. In some of these embodiments, the indication configured to be sent is further based on the second prediction.

In some embodiments, the first network node 1 1 1 may be further configured to, e.g., by means of the obtaining module 1 101 configured to, obtain, from the second network node 1 12: a) the measured total UL interference to the second cell 122 for the frequency band used by the first wireless device 131 , the total UL interference being configured to have been measured by the second network node 1 12 in the frequency band, the total UL interference being configured to have been measured in one of: the first time period and the second time period; and/or b) the one or more third predictions of the UL interference caused by third wireless devices 133 configured to be served by respective one or more third network nodes 1 13 to the second cell 122, each of the one or more third predictions being configured to have been determined, respectively, by each of the one or more third network nodes 1 13.

In some embodiments, the first network node 1 1 1 may be further configured to, e.g., by means of the obtaining module 1 101 configured to, obtain second information comprising one or more of: a) the interference caused by the second wireless device 132 configured to be served by the second network node 1 12 on the frequency band configured to be used by the first wireless device 131 ; b) the data rate achieved by the first network node 1 1 1 on the frequency band; and/or c) the data rate achieved by the second network node 1 12 on the frequency band.

The first network node 11 1 is further configured to, e.g. , by means of a sending module 1 102 configured to, send the indication to the second network node 1 12, the indication indicating the obtained first prediction.

The sending module 1 102 may be the processor 1 106 of the first network node 1 11. In some embodiments, the first network node 1 1 1 may be further configured to, e.g., by means of the sending module 1102 configured to, send, to the second network node 112: a) the measurement of a DL channel quality from the second network node 1 12, which measurement is configured to have been performed by the first wireless device 131 ; and/or b) the current transmission power of the first wireless device 131.

The first network node 1 1 1 may be further configured to, e.g., by means of an adjusting module 1 103 configured to, adjust at least one of: the first prediction configured to be obtained and the second prediction configured to be obtained, based on at least one of: the measured total UL interference configured to be obtained and the one or more third predictions.

The adjusting module 1 103 may be the processor 1 106 of the first network node

11 1 .

In some embodiments, the first network node 11 1 may be further configured to, e.g., by means of a determining module 1 104 configured to, determine the transmission power to be used by the first wireless device 131 , the determining of the transmission power being based on at least one of: the first prediction configured to be obtained, the second prediction configured to be obtained, the second information configured to be obtained, the adjusted first prediction configured to be obtained, the adjusted second prediction configured to be obtained, and the one or more third predictions configured to be obtained. Any of the first prediction configured to be obtained, the second prediction configured to be obtained, and the second information configured to be obtained, comprises information which is configured to have been autonomously determined or received from the second network node 1 12.

The determining module 1 104 may be the processor 1 106 of the first network node

11 1 . In some embodiments, the first network node 1 1 1 may be further configured to, e.g., by means of an instructing module 1 105 configured to, instruct the first wireless device 131 to use the transmission power configured to be determined.

The instructing module 1 105 may be the processor 1 106 of the first network node

11 1 .

Any of the first information, the second information, the first prediction, and the second prediction, may be configured to be obtained per radio frequency sub-band. The transmission power may be configured to be determined by radio frequency sub-band. The embodiments herein for to determining the prediction of an interference caused by the first wireless device 131 to the second cell 122 may be implemented through one or more processors, such as the processor 1106 in the first network node 11 1 depicted in Figure 1 1 , together with computer program code for performing the functions and actions of the embodiments herein. The program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the in the first network node 1 1 1. One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick. The computer program code may furthermore be provided as pure program code on a server and downloaded to the first network node 1 1 1. As indicated above, the processor 904 may comprise one or more circuits, which may also be referred to as one or more modules in some

embodiments, each configured to perform the actions carried out by the first network node 11 1 , as described above in reference to Figures 3-8, e.g., the obtaining module 1101 , the sending module 1102, the adjusting module 1103, the determining module 1104, and the instructing module 1 105. Hence, in some embodiments, the obtaining module 1101 , the sending module 1102, the adjusting module 1103, the determining module 1104, and the instructing module 1 105 described above may be implemented as one or more applications running on one or more processors such as the processor 1106. That is, the methods according to the embodiments described herein for the first network node 11 1 may be respectively implemented by means of a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first network node 1 11. The computer program product may be stored on a computer-readable storage medium. The computer-readable storage medium, having stored thereon the computer program, may comprise instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first network node 11 1 . In some embodiments, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a CD ROM disc, or a memory stick. In other embodiments, the computer program product may be stored on a carrier containing the computer program of the previous claim, wherein the carrier is one of an electronic signal, optical signal, radio signal, or the computer-readable storage medium, as described above.

The first network node 11 1 may further comprise a memory 1107 comprising one or more memory units. The memory 1 107 may be arranged to be used to store obtained information, such as the information received by the processor 1 106, store data configurations, schedulings, and applications etc. to perform the methods herein when being executed in the first network node 11 1 . Memory 1 107 may be in communication with the processor 1 106. Any of the other information processed by the processor 1106 may also be stored in the memory 1 107.

In some embodiments, information e.g. , from the second network node 112 or the first wireless device 131 , may be received through a receiving port 1108. The receiving port 1 108 may be in communication with the processor 1 106. The receiving port 1108 may also be configured to receive other information.

The processor 1 106 may be further configured to send messages, e.g., to the second network node 1 12 or the first wireless device 131 , through a sending port 1109, which may be in communication with the processor 1 106, and the memory 1107. Those skilled in the art will also appreciate that the any module within the first network node 1 1 1 , e.g., the obtaining module 1 101 , the sending module 1 102 and the adjusting module 1103, the determining module 1104, and the instructing module 1105 described above, may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the memory, that when executed by the one or more processors such as the processor 1 106, perform actions as described above, in relation to Figures 3-7. One or more of these processors, as well as the other digital hardware, may be included in a single application-specific integrated circuitry (ASIC), or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip (SoC).

To perform the method actions described above in relation to Figure 9, the second network node 1 12 is configured to determine the prediction of the interference caused by the first wireless device 131 to the second cell 122. The second network node 112 may comprise the following arrangement depicted in Figure 12. As already mentioned, the first wireless device 131 is configured to be served by the first network node 1 1 1. The second cell 122 is configured to be served by the second network node 1 12. The first wireless device 131 is in the radio coverage of the second network node 112. The second network node 1 12, the second network node 112 and the first wireless device 131 are configured to operate in the wireless communications network 100.

The detailed description of some of the following corresponds to the same references provided above, in relation to the actions described for the second network node 1 12, and will thus not be repeated here.

The second network node 1 12 is further configured to, e.g., by means of an

obtaining module 1201 configured to, obtain the historical information on UL interference by the first wireless device 131 , the uplink interference being configured to have been experienced by the second network node 1 12.

The obtaining module 1201 may be a processor 1204 of the second network node

112.

The historical information on uplink interference by the first wireless device 131 may be configured to be sent to the first network node 11 1 through an X2 interface. The second network node 1 12 is further configured to, e.g., by means of the obtaining module 1201 configured to, obtain the first prediction of the interference caused by the first wireless device 131 to the second cell 122 in the first time period, the obtaining of the first prediction being based on: the historical information configured to be obtained and the first information comprising one or more of: a) the measurement of the DL channel quality from the second network node 1 12, which measurement is configured to have been performed by the first wireless device 131 ; b) the measurement of the UL channel quality from the first wireless device 131 , which measurement is configured to be performed by the first network node 1 1 1 ; and/or c) the current transmission power of the first wireless device 131.

In some embodiments, to obtain the first prediction comprises to receive the indication from the first network node 11 1 , the indication indicating the first prediction.

The indication may be further based on the second prediction of the interference caused by the first wireless device 131 to the second cell 122 in the second time period, the second prediction being configured to have been obtained based on the estimation of the transmission power of the first wireless device 131 in the second time period, and on the first prediction.

In some embodiments, the second network node 1 12 may be further configured to, e.g. , by means of the obtaining module 1201 configured to, obtain: a) the measured total UL interference to the second cell 122 for the frequency band configured to be used by the first wireless device 131 , the total UL interference been configured to have been measured by the second network node 1 12 in the frequency band, the total UL interference being configured to have been measured in one of: the first time period and the second time period; and/or b) the one or more third predictions of the UL interference caused by third wireless devices 133 configured to be served by the respective one or more third network nodes 1 13 to the second cell 122, each of the one or more third predictions being configured to have been determined, respectively, by each of the one or more third network nodes 1 13.

The second network node 112 may be further configured to, e.g., by means of a sending module 1202 configured to, send the measured total UL interference configured to be obtained, and the one or more third predictions to the first network node 11 1 .

The sending module 1202 may be the processor 1204 of the second network node

112. The second network node 1 12 may be further configured to, e.g., by means of a receiving module 1203 configured to, receive the first information from the first network node 1 1 1. To obtain the first prediction may comprise to determine the first prediction.

The receiving module 1203 may be the processor 1204 of the second network node 112.

Any of the first information, the historical information on UL interference by the first wireless device 131 , the first prediction, and the second prediction may be configured to be obtained per radio frequency sub-band.

The embodiments herein for determining the prediction of an interference caused by the first wireless device 131 to the second cell 122 may be implemented through one or more processors, such as the processor 1204 in the second network node 112 depicted in Figure 12, together with computer program code for performing the functions and actions of the embodiments herein. The program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the in the second network node 1 12. One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick. The computer program code may furthermore be provided as pure program code on a server and downloaded to the second network node 1 12. As indicated above, the processor 1204 may comprise one or more circuits, which may also be referred to as one or more modules in some embodiments, each configured to perform the actions carried out by the second network node 1 12, as described above in reference to Figure 9, e.g., the obtaining module 1201 , the sending module 1202, and the receiving module 1203. Hence, in some embodiments, the obtaining module 1201 , the sending module 1202, and the receiving module 1203 described above may be implemented as one or more applications running on one or more processors such as the processor 1204. That is, the methods according to the embodiments described herein for the second network node 1 12 may be respectively implemented by means of a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the second network node 1 12. The computer program product may be stored on a computer- readable storage medium. The computer-readable storage medium, having stored thereon the computer program, may comprise instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the second network node 112. In some embodiments, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a CD ROM disc, or a memory stick. In other embodiments, the computer program product may be stored on a carrier containing the computer program of the previous claim, wherein the carrier is one of an electronic signal, optical signal, radio signal, or the computer-readable storage medium, as described above.

The second network node 112 may further comprise a memory 1205 comprising one or more memory units. The memory 1205 may be arranged to be used to store obtained information, such as the information received by the processor 1204, store data configurations, schedulings, and applications etc. to perform the methods herein when being executed in the second network node 1 12. Memory 1205 may be in communication with the processor 1204. Any of the other information processed by the processor 1204 may also be stored in the memory 1205.

In some embodiments, information e.g., from the first network node 1 1 1 or the first wireless device 131 , may be received through a receiving port 1206. The receiving port 1206 may be in communication with the processor 1204. The receiving port 1206 may also be configured to receive other information.

The processor 1204 may be further configured to send messages, e.g., to the first network node 1 1 1 or the first wireless device 131 , through a sending port 1207, which may be in communication with the processor 1204, and the memory 1205.

Those skilled in the art will also appreciate that the any module within the second network node 1 12, e.g., the obtaining module 1201 , the sending module 1202, and the receiving module 1203 described above, may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the memory, that when executed by the one or more processors such as the processor 1204, perform actions as described above, in relation to Figure 9. One or more of these processors, as well as the other digital hardware, may be included in a single application-specific integrated circuitry (ASIC), or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip (SoC). To perform the method actions described above in relation to Figure 10, the first wireless device 131 is configured to use the transmission power. The first wireless device 131 may comprise the following arrangement depicted in Figure 13. As already mentioned, the first wireless device 131 is configured to be served by the first network node 1 1 1. The first wireless device 131 is in the radio coverage of the second network node 1 12. The first wireless device 131 , the first wireless device 131 and the first wireless device 131 are configured to operate in the wireless communications network 100.

The detailed description of some of the following corresponds to the same references provided above, in relation to the actions described for the first wireless device 131 , and will thus not be repeated here. The first wireless device 131 is further configured to, e.g., by means of a sending module 1301 configured to, send, to the first network node 1 1 1 , the measurement of the DL channel quality from the second network node 1 12, which measurement is configured to be performed by the first wireless device 131 .

The sending module 1301 may be a processor 1304 of the first wireless device 131 .

The first wireless device 131 is further configured to, e.g., by means of a receiving module 1302 configured to, receive, from the first network node 1 11 , the instruction to use the transmission power, the transmission power being configured to have been determined by the first network node 1 11 based on the prediction of the interference caused by the first wireless device 131 to the second cell 122 configured to be served by the second network node 112, the prediction being based on the sent measurement.

The receiving module 1302 may be the processor 1304 of the first wireless device

131 .

The first wireless device 131 may be further configured to, e.g., by means of a using module 1303 configured to, use the transmission power as instructed by the first network node 1 1 1.

The using module 1303 may be the processor 1304 of the first wireless device 131. The embodiments herein for using the transmission power may be implemented through one or more processors, such as the processor 1304 in the first wireless device 131 depicted in Figure 13, together with computer program code for performing the functions and actions of the embodiments herein. The program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the in the first wireless device 131. One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick. The computer program code may furthermore be provided as pure program code on a server and downloaded to the first wireless device 131. As indicated above, the processor 1304 may comprise one or more circuits, which may also be referred to as one or more modules in some embodiments, each configured to perform the actions carried out by the first wireless device 131 , as described above in reference to Figure 10, e.g. , the sending module 1301 , the receiving module 1302, and the using module 1303. Hence, in some embodiments, the sending module 1301 , the receiving module 1302, and the using module 1303 described above may be implemented as one or more applications running on one or more processors such as the processor 1304. That is, the methods according to the embodiments described herein for the first wireless device 131 may be respectively implemented by means of a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first wireless device 131 . The computer program product may be stored on a computer- readable storage medium. The computer-readable storage medium, having stored thereon the computer program, may comprise instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first wireless device 131 . In some embodiments, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a CD ROM disc, or a memory stick. In other embodiments, the computer program product may be stored on a carrier containing the computer program of the previous claim, wherein the carrier is one of an electronic signal, optical signal, radio signal, or the computer-readable storage medium, as described above.

The first wireless device 131 may further comprise a memory 1305 comprising one or more memory units. The memory 1305 may be arranged to be used to store obtained information, such as the information received by the processor 1304, store data configurations, schedulings, and applications etc. to perform the methods herein when being executed in the first wireless device 131 . Memory 1305 may be in communication with the processor 1304. Any of the other information processed by the processor 1304 may also be stored in the memory 1305.

In some embodiments, information e.g. , from the first network node 1 11 or the second network node 1 12, may be received through a receiving port 1306. The receiving port 1306 may be in communication with the processor 1304. The receiving port 1306 may also be configured to receive other information.

The processor 1304 may be further configured to send messages, e.g., to the first network node 1 1 1 , through a sending port 1307, which may be in communication with the processor 1304, and the memory 1305.

Those skilled in the art will also appreciate that the any module within the first wireless device 131 , e.g., the sending module 1301 , the receiving module 1302, and the using module 1303 described above, may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the memory, that when executed by the one or more processors such as the processor 1304, perform actions as described above, in relation to Figure 10. One or more of these processors, as well as the other digital hardware, may be included in a single application-specific integrated circuitry (ASIC), or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip (SoC).

When using the word "comprise" or "comprising" it shall be interpreted as non- limiting, i.e. meaning "consist at least of".

The embodiments herein are not limited to the above described preferred embodiments. Various alternatives, modifications and equivalents may be used.

Therefore, the above embodiments should not be taken as limiting the scope of the invention.

Claims

1. A method performed by a first network node (1 11) for determining a prediction of an interference caused by a first wireless device (131 ) to a second cell (122), the first wireless device (131) being served by the first network node (1 1 1), the second cell (122) being served by a second network node (1 12), the first wireless device (131) being in the radio coverage of the second network node (1 12), and the first network node (11 1), the second network node (1 12) and the first wireless device (131) operating in a wireless communications network (100), the method comprising:

- obtaining (301) a first information comprising one or more of:

^■ a measurement of a downlink channel quality from the second

network node (1 12), which measurement has been performed by the first wireless device (131);

^■ a measurement of an uplink channel quality from the first wireless device (131), which measurement is performed by the first network node (1 11 );

^■ historical information on uplink interference by the first wireless device (131), the uplink interference having been experienced by the second network node (1 12), and

^■ a current transmission power of the first wireless device (131 ),

- obtaining (302), based on the obtained first information, a first prediction of an interference caused by the first wireless device (131) to the second cell (122) in a first time period,

- sending (305) an indication to the second network node (1 12), the indication indicating the obtained first prediction.

The method of claim 1 , further comprising:

- obtaining (303) an estimation of a transmission power of the first wireless device (131) in a second time period, the obtaining (303) of the estimation being based on the current transmission power of the first wireless device (131), and

- obtaining (304) a second prediction of an interference caused by the first wireless device (131) to the second cell (122) in the second time period, the obtaining (304) of the second prediction being based on the obtained estimation of the transmission power and the obtained first prediction and wherein the sent indication is further based on the second prediction.

The method of claim 2, further comprising:

- obtaining (306), from the second network node (1 12):

^■ a measured total uplink interference to the second cell (122) for a frequency band used by the first wireless device (131), the total uplink interference having been measured by the second network node (112) in the frequency band, the total uplink interference having been measured in one of: the first time period and the second time period;

^■ one or more third predictions of an uplink interference caused by third wireless devices (133) served by respective one or more third network nodes (113) to the second cell (122), each of the one or more third predictions having been determined, respectively, by each of the one or more third network nodes (113), and

- adjusting (307) at least one of: the obtained first prediction and the obtained second prediction, based on at least one of: the obtained measured total uplink interference and the one or more third predictions.

The method of any of claims 1-3, further comprising:

- sending (308), to the second network node (1 12):

^■ the measurement of a downlink channel quality from the second network node (1 12), which measurement has been performed by the first wireless device (131); and

^■ the current transmission power of the first wireless device (131).

The method of claim 3, further comprising:

- obtaining (309) second information comprising one or more of:

^■ an interference caused by a second wireless device (132) served by the second network node (1 12) on a frequency band used by the first wireless device (131);

■ a data rate achieved by the first network node (111) on the frequency band, and ^■ a data rate achieved by the second network node (112) on the frequency band.

- determining (310) a transmission power to be used by the first wireless device (131), the determining (210) of the transmission power being based on at least one of: the obtained first prediction, the obtained second prediction, the obtained second information, the adjusted obtained first prediction, the adjusted obtained second prediction, and the obtained one or more third predictions, wherein any of the obtained first prediction, the obtained second prediction, and the obtained second information, comprises information which has been autonomously determined or received from the second network node (112).

The method of claim 5, further comprising:

- instructing (311) the first wireless device (131) to use the determined

transmission power.

The method of any of claims 5-6, wherein any of the first information, the second information, the first prediction, and the second prediction, are obtained per radio frequency sub-band, and wherein the determined transmission power is determined by radio frequency sub-band.

The method of any of claims 1-7, wherein the historical information on uplink interference by the first wireless device (131) is received from the second network node (112) through an X2 interface.

A method performed by a second network node (1 12) for determining a prediction of an interference caused by a first wireless device (131) to a second cell (122) served by the second network node (112), the first wireless device (131) being in the radio coverage of the second network node (112), and the first wireless device (131) being served by a first network node (111), the first network node (111), the second network node (112) and the first wireless device (131) operating in a wireless communications network (100), the method comprising:

- obtaining (901): ^■ historical information on uplink interference by the first wireless device (131), the uplink interference having been experienced by the second network node (1 12), and

- obtaining (903) a first prediction of an interference caused by the first wireless device (131) to the second cell (122) in a first time period, the obtaining of the first prediction being based on: the obtained historical information and a first information comprising one or more of:

^■ a measurement of a downlink channel quality from the second network node (1 12), which measurement has been performed by the first wireless device (131);

^■ a measurement of an uplink channel quality from the first wireless device (131), which measurement is performed by the first network node (1 11 ); and

^■ a current transmission power of the first wireless device (131).

10. The method of claim 9, wherein the obtaining (903) the first prediction comprises receiving an indication from the first network node (1 1 1), the indication indicating the first prediction.

1 1. The method of claim 10, wherein the indication is further based on a second

prediction of an interference caused by the first wireless device (131 ) to the second cell (122) in a second time period, the second prediction having been obtained based on an estimation of the transmission power of the first wireless device (131) in the second time period, and on the first prediction.

12. The method of any of claims 9-11 , further comprising:

- obtaining (904):

^■ a measured total uplink interference to the second cell (122) for a frequency band used by the first wireless device (131), the total uplink interference having been measured by the second network node (1 12) in the frequency band, the total uplink interference having been measured in one of: the first time period and a second time period;

^■ one or more third predictions of an uplink interference caused by third wireless devices (133) served by respective one or more third network nodes (1 13) to the second cell (122), each of the one or more third predictions having been determined, respectively, by each of the one or more third network nodes (113), and

- sending (905) the obtained measured total uplink interference and the one or more third predictions to the first network node (1 1 1 ).

13. The method of claim 9, further comprising:

- receiving (902) the first information from the first network node (1 1 1 ), and wherein the obtaining (903) the first prediction comprises determining the first prediction.

14. The method of any of claims 9-13, wherein any of the first information, the historical information on uplink interference by the first wireless device (131), the first prediction, and the second prediction are obtained per radio frequency sub-band.

15. The method of any of claims 9-14, wherein the historical information on uplink

interference by the first wireless device (131) is sent to the first network node (1 11 ) through an X2 interface.

16. A method performed by a first wireless device (131) for using a transmission power, the first wireless device (131) being served by a first network node (1 1 1), the first wireless device (131) being in the radio coverage of a second network node (112), the first network node (1 11 ), the second network node (112) and the first wireless device (131) operating in a wireless communications network (100), the method comprising:

- sending (1001), to the first network node (11 1), a measurement of a downlink channel quality from the second network node (1 12), which measurement is performed by the first wireless device (131); and

- receiving (1002), from the first network node (1 11 ), an instruction to use a transmission power, the transmission power having been determined by the first network node (1 1 1 ) based on a prediction of an interference caused by the first wireless device (131) to a second cell (122) served by the second network node (1 12), the prediction being based on the sent measurement, and

- using (1003) the transmission power as instructed by the first network node (1 1 1).

17. A first network node (1 1 1 ) configured to determine a prediction of an

interference caused by a first wireless device (131) to a second cell (122), the first wireless device 131 being configured to be served by the first network node (1 1 1), the second cell (122) being configured to be served by a second network node (1 12), the first wireless device (131) being in the radio coverage of the second network node (112), and the first network node (1 1 1), the second network node (1 12) and the first wireless device (131) being configured to operate in a wireless communications network (100), the first network node (1 1 1) being further configured to:

- obtain a first information comprising one or more of:

^■ a measurement of a downlink channel quality from the second network node (1 12), which measurement is configured to have been performed by the first wireless device (131);

- a measurement of an uplink channel quality from the first wireless device (131), which measurement is configured to be performed by the first network node (1 11);

^■ historical information on uplink interference by the first wireless device (131), the uplink interference being configured to be have been experienced by the second network node (1 12), and

^■ a current transmission power of the first wireless device (131 ),

- obtain, based on the first information configured to be obtained, a first prediction of an interference caused by the first wireless device (131) to the second cell (122) in a first time period,

- send an indication to the second network node (1 12), the indication indicating the obtained first prediction.

18. The first network node (1 11) of claim 17, being further configured to:

- obtain an estimation of a transmission power of the first wireless device (131) in a second time period, the obtaining of the estimation being based on the current transmission power of the first wireless device (131), and

- obtain a second prediction of an interference caused by the first wireless device (131) to the second cell (122) in the second time period, the obtaining of the second prediction being based on the estimation of the transmission power configured to be obtained, and the first prediction configured to be obtained and

wherein the indication configured to be sent is further based on the second prediction.

19. The first network node (111) of claim 18, being further configured to:

- obtain, from the second network node (1 12):

^■ a measured total uplink interference to the second cell (122) for a frequency band used by the first wireless device (131), the total uplink interference being configured to have been measured by the second network node (1 12) in the frequency band, the total uplink interference being configured to have been measured in one of: the first time period and the second time period;

^■ one or more third predictions of an uplink interference caused by third wireless devices (133) configured to be served by respective one or more third network nodes (113) to the second cell (122), each of the one or more third predictions being configured to have been determined, respectively, by each of the one or more third network nodes (113), and

- adjust at least one of: the first prediction configured to be obtained and the second prediction configured to be obtained, based on at least one of: the measured total uplink interference configured to be obtained and the one or more third predictions.

20. The first network node (111) of any of claims 17-19, being further configured to:

- send, to the second network node (1 12):

^■ the measurement of a downlink channel quality from the second network node (1 12), which measurement is configured to have been performed by the first wireless device (131); and

■ the current transmission power of the first wireless device (131).

21. The first network node (111) of claim 19, being further configured to:

- obtain second information comprising one or more of:

■ an interference caused by a second wireless device (132)

configured to be served by the second network node (112) on a frequency band configured to be used by the first wireless device (131 );

^■ a data rate achieved by the first network node (1 1 1 ) on the

frequency band, and

■ a data rate achieved by the second network node (1 12) on the frequency band.

- determine a transmission power to be used by the first wireless device (131), the determining of the transmission power being based on at least one of: the first prediction configured to be obtained, the second prediction configured to be obtained, the second information configured to be obtained, the adjusted first prediction configured to be obtained, the adjusted second prediction configured to be obtained, and the one or more third predictions configured to be obtained, wherein any of the first prediction configured to be obtained, the second prediction configured to be obtained, and the second information configured to be obtained, comprises information which is configured to have been autonomously determined or received from the second network node (1 12).

22. The first network node (1 11) of claim 21 , being further configured to:

- instruct the first wireless device (131 ) to use the transmission power

configured to be determined.

23. The first network node (11 1) of any of claims 21 -22, wherein any of the first

information, the second information, the first prediction, and the second prediction, are configured to be obtained per radio frequency sub-band, and wherein the transmission power is configured to be determined by radio frequency sub-band.

24. The first network node (11 1) of any of claims 17-23, wherein the historical

information on uplink interference by the first wireless device (131) is configured to be received from the second network node (1 12) through an X2 interface.

25. A second network node (1 12) configured to determine a prediction of an

interference caused by a first wireless device (131) to a second cell (122), the first wireless device 131 being configured to be served by a first network node (1 11), the second cell (122) being configured to be served by the second network node (1 12), the first wireless device (131) being in the radio coverage of the second network node (1 12), and the first network node (1 1 1), the second network node (1 12) and the first wireless device (131 ) being configured to operate in a wireless communications network (100), the second network node (1 12) being further configured to:

- obtain:

^■ historical information on uplink interference by the first wireless device (131), the uplink interference being configured to have been experienced by the second network node (1 12), and

- obtain a first prediction of an interference caused by the first wireless device

(131) to the second cell (122) in a first time period, the obtaining of the first prediction being based on: the historical information configured to be obtained and a first information comprising one or more of:

^■ a measurement of an uplink channel quality from the first wireless device (131), which measurement is configured to be performed by the first network node (11 1); and

- a current transmission power of the first wireless device (131).

26. The second network node (1 12) of claim 25, wherein to obtain the first prediction comprises to receive an indication from the first network node (1 1 1), the indication indicating the first prediction.

27. The second network node (1 12) of claim 26, wherein the indication is further based on a second prediction of an interference caused by the first wireless device (131) to the second cell (122) in a second time period, the second prediction being configured to have been obtained based on an estimation of the transmission power of the first wireless device (131) in the second time period, and on the first prediction.

28. The second network node (1 12) of any of claims 25-27, being further configured to:

- obtain: ^■ a measured total uplink interference to the second cell (122) for a frequency band configured to be used by the first wireless device (131 ), the total uplink interference been configured to have been measured by the second network node (112) in the frequency band, the total uplink interference being configured to have been measured in one of: the first time period and a second time period;

^■ one or more third predictions of an uplink interference caused by third wireless devices (133) configured to be served by respective one or more third network nodes (1 13) to the second cell (122), each of the one or more third predictions being configured to have been determined, respectively, by each of the one or more third network nodes (113), and

send the measured total uplink interference configured to be obtained, and the one or more third predictions to the first network node (1 11).

29. The second network node (1 12) of claim 25, being further configured to:

- receive the first information from the first network node (1 1 1), and wherein to obtain the first prediction comprises to determine the first prediction.

30. The second network node (1 12) of any of claims 25-29, wherein any of the first information, the historical information on uplink interference by the first wireless device (131), the first prediction, and the second prediction are configured to be obtained per radio frequency sub-band.

31. The second network node (1 12) of any of claims 25-30, wherein the historical information on uplink interference by the first wireless device (131) is configured to be sent to the first network node (1 11) through an X2 interface.

32. A first wireless device (131) configured to use a transmission power, the first

wireless device (131) being configured to be served by a first network node (1 1 1), the first wireless device (131) being in the radio coverage of a second network node (1 12), the first network node (11 1), the second network node (112) and the first wireless device (131) being configured to operate in a wireless

communications network (100), the first wireless device (131 ) being further configured to: - send, to the first network node (1 11 ), a measurement of a downlink channel quality from the second network node (1 12), which measurement is configured to be performed by the first wireless device (131); and

- receive, from the first network node (1 11 ), an instruction to use a transmission power, the transmission power being configured to have been determined by the first network node (11 1) based on a prediction of an interference caused by the first wireless device (131 ) to a second cell (122) configured to be served by the second network node (1 12), the prediction being based on the sent measurement, and

- use the transmission power as instructed by the first network node (1 1 1 ).