HK1237153A1 - Full duplex in a wireless communication network - Google Patents

Description

Full duplex in wireless communication networks

Technical Field

The proposed technology relates generally to transmission and reception in wireless communication networks, and more particularly to the use of full duplex in wireless communication networks.

Background

Conventional radio transceivers are not capable of transmitting and receiving signals simultaneously on the same frequency band. The interference from the transmitted signal to the received signal is too strong to decode the received signal. In contrast, conventional transceivers transmit and receive at different frequencies using Frequency Division Duplexing (FDD) and/or at different points in time using Time Division Duplexing (TDD).

However, recent advances in transceiver design [1,2] allow simultaneous transmission and reception on the same frequency. This is called full duplex. To achieve full duplex, the radio node must completely eliminate the significant self-interference to the received signal due to its own transmission [3 ]. If a node cannot hear its own signal, its own transmission will not interfere with other packets; which may be transmitted and received simultaneously. Full duplex has a huge impact on network design, especially the fact that cellular networks can cut their spectrum in half.

However, in a multi-cell system, the use of full duplex in a node or cell increases the interference level in the system. This is because in each cell a transmitter may be active in both the uplink and downlink directions, not just in one direction. Thus, using full duplex in one node or cell may severely degrade performance in neighboring nodes or cells. Thus, it is not always advantageous to use full duplex in a wireless communication network.

Disclosure of Invention

It is an object to provide a method and a wireless node for determining when to use full duplex in a wireless node for communicating in a wireless communication network.

This and other objects are met by embodiments of the proposed technology.

One aspect of the embodiments relates to a method performed by a wireless node for determining when to use full duplex in the wireless node for communicating in a wireless communication network. The method comprises the following steps: the effect of using full duplex in a wireless node on neighboring wireless nodes is estimated. The method further comprises the following steps: deciding whether to use full duplex in the wireless node based on the estimated impact.

Another aspect of the embodiments relates to a wireless node configured to determine when full duplex is used in the wireless node for communicating in a wireless communication network. The wireless node is configured to estimate an impact of using full duplex in the wireless node on a neighboring wireless node. The wireless node is further configured to decide whether to use full duplex in the wireless node based on the estimated impact.

Yet another aspect of the embodiments relates to a wireless node for determining when full duplex is used in the wireless node for communicating in a wireless communications network. The wireless node comprises an estimation module for estimating an impact of using full duplex in the wireless node on a neighboring wireless node. The wireless node further comprises a decision module for deciding whether to use full duplex in the wireless node based on the estimated impact.

Yet another aspect of the embodiments relates to a computer program comprising instructions that, when executed by at least one processor, cause the one or more processors to estimate an impact of using full duplex in a wireless node on a neighboring wireless node, and decide whether to use full duplex in the wireless node based on the estimated impact.

Yet another aspect of the embodiments relates to a carrier comprising the above computer program, wherein the carrier is one of: an electronic signal, optical signal, electromagnetic signal, magnetic signal, electrical signal, radio signal, microwave signal, or computer readable storage medium.

The advantage of the proposed scheme is that in case of controlled interference levels, the local benefit of full duplex (higher bandwidth) is obtained. Other advantages will be appreciated upon reading the detailed description.

Drawings

The embodiments, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings in which:

fig. 1a, 1b and 1c are schematic diagrams of examples of wireless nodes in some wireless communication networks.

Fig. 2 is a schematic flow chart diagram illustrating an example of a method performed by a wireless node for determining when full duplex is used in the wireless node for communicating in a wireless communication network according to an embodiment.

Fig. 3 is a schematic diagram illustrating an example of a wireless node configured to determine when full duplex is used in the wireless node for communicating in a wireless communication network according to an embodiment.

Fig. 4 is a schematic diagram illustrating an example of a wireless node operable to determine when full duplex is used in the wireless node for communicating in a wireless communication network, according to an alternative embodiment.

Fig. 5 is a schematic block diagram illustrating an example of a wireless node for determining when full duplex is used in the wireless node for communicating in a wireless communication network according to an alternative embodiment.

Detailed Description

Throughout the drawings, the same reference numerals are used for similar or corresponding elements.

As described in the background section, the use of full duplex in one node or cell can severely degrade performance in neighboring nodes or cells. Therefore, it is not always advantageous to use full duplex in a wireless communication system. Therefore, there is a need for an efficient procedure for determining when using full duplex is appropriate and when it is not.

The proposed scheme involves adaptively using full duplex based on what impact or what negative/detrimental impact on neighboring nodes or cells is made in a particular node using full duplex. Fig. 2 is a schematic flow chart diagram illustrating an example of a method performed by a wireless node for determining when to use full duplex in the wireless node for communicating in a wireless communication network. The method includes the following step S10: the effect of using full duplex in a wireless node on neighboring wireless nodes is estimated. The method further includes the following step S20: deciding whether to use full duplex in the wireless node based on the estimated impact.

As described in the background section, the use of full duplex in a node may increase the interference level in the system. Therefore, it may be appropriate to consider what interference level is acceptable in neighboring wireless nodes before deciding to use full duplex in the wireless node.

If we consider a time instant in time, using full duplex in a wireless node may affect the interference that the node generates in neighboring nodes at that time instant. However, over time and in the case of bursty traffic, the number of such times when a node will use full duplex depends on the traffic load in that node. In other words, the "over time" impact or shock to neighboring nodes using full duplex in a node depends on both the interference generated at each instance when full duplex is used and the fraction of time that full duplex is used. Here, the latter factor depends on the traffic load in the node.

Also, the "relative" impact on a neighboring node (the "victim" node) (i.e., how "harmful" the use of full-duplex in the node is to the neighboring node) may depend on the traffic load in the neighboring node. For example, if the neighboring nodes are lightly loaded, the increase in interference may be less severe than if the load is heavier.

Thus, the impact of using full duplex in a wireless node on a neighboring wireless node may depend at least on the traffic load of the wireless node, and/or the traffic load of the neighboring wireless node, and/or interference generated by the wireless node in the neighboring wireless node. In an example embodiment of the method of fig. 2, the step S10 of estimating the impact of using full duplex in a wireless node on a neighboring wireless node is thus based on at least one of:

the estimated traffic load of the wireless node,

the estimated traffic load of the neighboring wireless node,

estimated interference generated by a wireless node in a neighboring wireless node.

Some example implementations:

heavier loaded nodes/cells surrounded by lighter loaded nodes/cells may use full duplex.

Lighter loaded nodes/cells surrounded by heavier loaded nodes/cells are not allowed to use full duplex.

Isolated nodes/cells (including all their users) are allowed to use full duplex.

Furthermore, the use of full duplex may be node specific and dependent on the channel between the individual nodes scheduled.

Node-specific examples:

base stations isolated from other base stations are allowed to transmit in the downlink when those other base stations receive in the uplink.

A cell that has transmitted in the downlink is allowed to schedule uplink transmissions also from a user (i.e. using full duplex) if the channel between the user and the interfered node is such that low interference is caused.

In particular embodiments, the step S20 of deciding whether to use full duplex in the wireless node is based on a comparison of the estimated traffic load of the wireless node and the estimated traffic loads of neighboring wireless nodes.

In another particular embodiment, the step S20 of deciding whether to use full duplex in the wireless node is based on the estimated traffic load of the wireless node exceeding a particular percentage of the average of the estimated traffic loads of neighboring wireless nodes.

In a particular embodiment, the step S20 of deciding whether to use full duplex in the wireless node is performed for each scheduled subframe.

In addition to the proposed embodiments, a control mechanism based on subframe classification and mode coordination between nodes may be used. In such embodiments, some subframes are allocated for half-duplex and some subframes are allocated for full-duplex, and when traffic load increases in one node, neighboring nodes should primarily use half-duplex subframes.

There are several ways to estimate the traffic load in different nodes. In one embodiment, the estimated traffic load of the wireless node is based on resource utilization in the wireless node, and in an alternative embodiment, the estimated traffic load of the wireless node is based on throughput of data traffic in the wireless node. Any of these alternative embodiments may be used for any wireless node in a wireless communication network.

Also, the interference or coupling between a node and its neighboring nodes can be estimated in several ways. In one embodiment, the estimated interference generated by the wireless node in the neighboring wireless node may be estimated based on the absolute interference power measured in the neighboring wireless node. In an alternative embodiment, the interference may be estimated based on power versus thermal noise measured in neighboring wireless nodes. In both embodiments, the estimation may be based on an estimation of channel gain between the wireless node and the neighboring wireless node.

The wireless node may be any node in a wireless communication network. Some examples of wireless nodes in some wireless communication networks 1, 1', 1 "are schematically illustrated in fig. 1a, 1b and 1 c.

In a particular embodiment, the wireless node 10 is a wireless base station in a wireless communication network 1, as illustrated in fig. 1 a. In this embodiment, the neighboring wireless nodes 20, 30 may also be wireless base stations. In this example, the wireless node 10 may communicate with the user equipment 40 using full duplex, depending on the impact on the use of full duplex in the wireless node 10 on the neighboring wireless nodes 20, 30.

Another implementation is schematically illustrated in fig. 1b, showing an example where full duplex is used in a backhaul context. Here again, the wireless node 10 is a wireless base station, but communicates with another wireless base station 40', thereby providing backhaul in the wireless communication network 1'. In this embodiment, the wireless node 10 may also communicate with the wireless node 40' using full duplex, depending on the impact of using full duplex in the wireless node 10 on the neighboring wireless nodes 20, 30.

In another particular embodiment illustrated in fig. 1c, the wireless node 10' is a user equipment in a wireless communication network 1 ". In this embodiment, the neighboring wireless nodes 20', 30' may also be user equipment. In this example, the wireless node 10 'may communicate with the user equipment 40 using full duplex, depending on the impact of using full duplex in the wireless node 10' on the neighboring wireless nodes 20', 30'.

The proposed scheme can also be implemented in a system where the architecture comprises a centralized processing.

In summary, the proposed scheme enables adaptive use of full duplex based on traffic load and/or neighboring node relations. The advantage of the proposed scheme is that in case of controlled interference levels, the local benefit of full duplex (higher bandwidth) is obtained.

In an example of an implementation, at least some of the steps, functions, programs, modules, and/or blocks described herein are implemented in a computer program that is loaded into memory for execution by processing circuitry including one or more processors. The processor and memory are interconnected to each other to enable normal software execution. Optional input/output devices may also be interconnected to the processor and/or memory to enable input and/or output of relevant data, such as input parameters and/or generated output parameters.

Thus, embodiments herein may be implemented by one or more processors (such as the processors in the wireless nodes depicted in fig. 3 and 4) in conjunction with corresponding computer program code for performing the functions and acts of the embodiments herein.

According to an embodiment, a wireless node is configured to determine when full duplex is used in the wireless node for communicating in a wireless communication network. The wireless node is configured to estimate an impact of using full duplex in the wireless node on a neighboring wireless node. The wireless is further configured to decide whether to use full duplex in the wireless node based on the estimated impact.

As described above, the impact of using full duplex in a wireless node on a neighboring wireless node may depend at least on the traffic load of the wireless node, and/or the traffic load of the neighboring wireless node, and/or interference generated by the wireless node in the neighboring wireless node. Thus, in an embodiment, the wireless node is configured to estimate the impact of using full duplex in the wireless node on neighboring wireless nodes based on at least one of:

the estimated traffic load of the wireless node,

the estimated traffic load of the neighboring wireless node,

estimated interference generated by a wireless node in a neighboring wireless node.

In a particular embodiment, the wireless node is configured to decide whether to use full duplex in the wireless node based on a comparison of the estimated traffic load of the wireless node and the estimated traffic loads of neighboring wireless nodes.

In another particular embodiment, the wireless node is configured to decide whether to use full duplex in the wireless node based on the estimated traffic load of the wireless node exceeding a certain percentage of an average of the estimated traffic loads of neighboring wireless nodes.

In a particular embodiment, the wireless node is configured to decide for each scheduled subframe whether to use full duplex in the wireless node.

Fig. 3 is a schematic diagram illustrating a wireless node 10 according to an embodiment; 10' operable to determine when full duplex is used in a wireless node for communicating in a wireless communications network. In this example, the wireless node 10; 10' basically includes a processor 11, associated memory 12 and optional communication circuitry 13. Optional communication circuitry 13 is adapted for wireless and/or wired communication with one or more other nodes, including transmitting and/or receiving information.

As indicated in the specific example of fig. 3, the wireless node 10; 10' comprises a processor 11 and a memory 12, wherein memory 12 comprises instructions executable by processor 11 to execute wireless node 10; 10' of the operation. Thus, in this example embodiment, the processor 11 is operable to estimate the effect of using full duplex in a wireless node on neighbouring wireless nodes. The processor 11 is further operable to decide whether to use full duplex in the wireless node based on the estimated impact.

As indicated in fig. 3, the wireless node 10; 10' may also include communication circuitry 13 for communicating with one or more other nodes, including transmitting and/or receiving information. Thus, in particular embodiments, the wireless node 10; 10' comprises a communication circuit 13 configured to receive from the neighboring wireless node the estimated traffic load of the neighboring wireless node and/or the wireless node 10; 10' reports of estimated interference generated in neighboring wireless nodes.

As described above, at least some of the steps, functions, procedures, modules and/or blocks described above may be implemented in software, such as a computer program for execution by suitable processing circuitry (including one or more processing units). An example of such an implementation is schematically illustrated in fig. 4.

According to the embodiment schematically illustrated in fig. 4, the computer program 14 comprises instructions that, when executed by the at least one processor 11, cause the one or more processors to estimate an impact of using full duplex in the wireless node on a neighboring wireless node and decide whether to use full duplex in the wireless node based on the estimated impact.

By way of example, the software or computer program may be implemented as a computer program product, typically carried on or stored on a computer readable medium (particularly a non-volatile medium). The computer-readable medium may include one or more removable or non-removable memory devices, including but not limited to Read Only Memory (ROM), Random Access Memory (RAM), Compact Discs (CDs), Digital Versatile Discs (DVDs), blu-ray discs, Universal Serial Bus (USB) memory, Hard Disk Drive (HDD) storage devices, flash memory, magnetic tape, or any other conventional memory device. Thus, the computer program may be loaded into the operating memory of a computer or equivalent processing device for execution by the processing circuitry thereof.

The proposed technology also provides a carrier 15 as illustrated in fig. 4 and comprising the above computer program 14, wherein the carrier is one of: an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electrical signal, a radio signal, a microwave signal, or a computer-readable storage medium.

The flowcharts or diagrams presented above may be considered computer flowcharts or diagrams when executed by one or more processors. A corresponding wireless node may be defined as a set of functional modules, wherein each step performed by a processor corresponds to a functional module. In this case, the functional modules are implemented as computer programs running on a processor. Hence, the wireless node may alternatively be defined as a set of functional modules, wherein the functional modules are implemented as computer programs running on at least one processor.

Accordingly, the computer programs residing in the memory may be organized into suitable functional modules configured to perform at least a portion of the steps and/or tasks described herein when executed by the processor. An example of such a functional module is illustrated in fig. 5.

Fig. 5 is a diagram illustrating a wireless node 10 according to an embodiment; 10', a wireless node 10; 10' for determining when full duplex is used in a wireless node for communicating in a wireless communication network. In this example, the wireless node 10; 10' includes an estimation module 100 for estimating an impact of using full duplex in a wireless node on a neighboring wireless node. A wireless node 10; 10' further comprises a decision module 200 for deciding whether to decide at the wireless node 10 based on the estimated impact; full duplex is used in 10'.

In a particular embodiment, the wireless node 10 illustrated in fig. 5; the estimated impact of using full duplex on neighboring wireless nodes in 10' is based on at least one of:

a wireless node 10; the estimated traffic load of 10' is,

the estimated traffic load of the neighboring wireless node,

a wireless node 10; 10' estimated interference generated in a neighboring wireless node.

When the word "comprising" or "comprises" is used, it should be interpreted as non-limiting (i.e., meaning "consisting of at least … …").

As used herein, the non-limiting terms "user equipment" or "UE" may refer to a mobile phone, a cellular phone, a personal digital assistant PDA equipped with radio communication capabilities, a smart phone, a laptop or personal computer PC equipped with an internal or external mobile broadband modem, a tablet PC with radio communication capabilities, a target device, a device-to-device UE, a machine type UE or UE capable of machine-to-machine communication, an iPAD, a customer premises equipment CPE, a laptop embedded device LEE, a laptop installation device LME, a USB dongle, a portable electronic radio communication device, a sensor device equipped with radio communication capabilities, or the like. In particular, the term "user equipment" should be construed as a non-limiting term including any type of wireless device communicating with a radio network node in a cellular or mobile communication system or any device equipped with radio circuitry for wireless communication according to any relevant standard for communicating within a cellular or mobile communication system.

As used herein, the non-limiting term "radio base station" may cover different types of radio base stations, including standardized base stations such as Node bs or evolved Node bs (enodebs) as well as macro/micro/pico radio base stations, home base stations (also referred to as femto base stations), relay nodes, relays, wireless access points, base transceiver stations BTS and even control nodes controlling one or more remote radio units RRU, etc.

It will be understood that the methods and apparatus described herein may be combined and rearranged in various ways.

For example, embodiments may be implemented in hardware or in software for execution by suitable processing circuitry, or a combination thereof.

The steps, functions, procedures, modules and/or blocks described herein may be implemented in hardware using any conventional technology, such as discrete circuit or integrated circuit technology, including both general purpose electronic circuitry and application specific circuitry.

Particular examples include one or more suitably configured digital signal processors and other known electronic circuitry (e.g., discrete logic gates interconnected to perform a dedicated function or an Application Specific Integrated Circuit (ASIC)).

Examples of processing circuitry include, but are not limited to, one or more microprocessors, one or more Digital Signal Processors (DSPs), one or more Central Processing Units (CPUs), video acceleration hardware, and/or any suitable programmable logic circuitry (such as one or more Field Programmable Gate Arrays (FPGAs) or one or more Programmable Logic Controllers (PLCs)).

It will also be appreciated that it is also possible to reuse the general processing power of any conventional device or unit in which the proposed techniques are implemented. It is also possible to reuse existing software, for example by reprogramming the existing software or by adding new software components.

The term "processor" should be interpreted in a generic sense as any system or device capable of executing program code or computer program instructions to perform a particular processing, determining, or computing task.

Thus, a processing circuit comprising one or more processors is configured to perform well-defined processing tasks (such as those described above) when executing a computer program.

The processing circuitry need not be dedicated to performing only the above-described steps, functions, procedures and/or blocks, but may also perform other tasks.

The embodiments described above are given as examples only, and it should be understood that the proposed technology is not limited thereto. Those skilled in the art will appreciate that various modifications, combinations, and alterations to the embodiments may be made without departing from the scope of the invention, which is defined by the appended claims. In particular, the different partial solutions in the different embodiments can be combined in other configurations, where technically possible.

Reference to the literature

[1]D.W.Bliss,P.Parker,and A.R.Margetts,“Simultaneous transmission andreception for improved wireless network performance”,in Statistical SignalProcessing,2007.SSP'07.IEEE/SP 14th Workshop on,Aug.2007,pp.478-482

[2]M.Duarte,and A.Sabharwal,“Full-duplex wireless communicationsusing off-the-shelf radios:Feasibility and first results”,in Signals,Systemsand Computers(ASILOMAR),2010Conference Record of the Forty Fourth AsilomarConference on,Nov.7-10 2010,pp.1558-1562

[3]S.Hong,J.Brand,Jung Choi,M.Jain,J.Mehlman,S.Katti,P.Levis,“Applications of self-interference cancellation in 5G and beyond”,Communications Magazine,IEEE(Volume:52,Issue:2),February 2014,pp.114-121

Claims (28)

1. A method performed by a wireless node (10; 10') for determining when full duplex is used in the wireless node (10; 10') for communication in a wireless communication network (1; 1 '), wherein the method comprises the steps of:

estimating (S10) an impact on a neighboring wireless node (20; 20', 30; 30') using full duplex in the wireless node (10; 10 ');

deciding (S20) whether to use full duplex in the wireless node (10; 10') based on the estimated impact.

2. The method of claim 1, wherein the estimating (S10) an impact on a neighboring wireless node (20; 20', 30; 30') using full duplex in the wireless node (10; 10') is based on at least one of:

an estimated traffic load of the wireless node (10; 10');

an estimated traffic load of the neighboring wireless node (20; 20', 30; 30');

estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30 ').

3. The method of claim 2, wherein the decision (S20) is based on a comparison of the estimated traffic load of the wireless node (10; 10') and the estimated traffic load of the neighboring wireless node (20; 20', 30; 30 ').

4. The method of claim 3, wherein the decision (S20) is based on the estimated traffic load of the wireless node (10; 10') exceeding a certain percentage of the average of the estimated traffic loads of the neighboring wireless nodes (20; 20', 30; 30 ').

5. The method according to any of claims 1-4, wherein the deciding (S20) is performed for each scheduled subframe.

6. The method according to any of claims 2 to 5, wherein the estimated traffic load of the wireless node (10; 10') is based on one of:

resource utilization in the wireless node (10; 10');

a throughput of data traffic in the wireless node (10; 10').

7. The method of any of claims 2 to 6, wherein the estimated traffic load of the neighboring wireless node (20; 20', 30; 30') is based on one of:

resource utilization in the neighboring wireless node (20; 20', 30; 30');

a throughput of data traffic in the neighboring wireless node (20; 20', 30; 30').

8. The method of any of claims 2 to 7, wherein the estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30') is based on an estimate of a channel gain between the wireless node (10; 10') and the neighboring wireless node (20; 20', 30; 30').

9. The method of claim 8, wherein the estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30') is based on one of:

absolute interference power measured in the neighboring wireless node (20; 20', 30; 30');

the measured power in the neighboring wireless node (20; 20', 30; 30') is relative to thermal noise.

10. The method according to any of claims 1 to 9, wherein the wireless node (10; 10') is a wireless base station.

11. The method according to any of claims 1 to 9, wherein the wireless node (10; 10') is a user equipment.

12. A wireless node (10; 10') configured to determine when full duplex is used in the wireless node (10; 10') for communicating in a wireless communication network (1; 1 '), wherein the wireless node (10; 10') is configured to estimate an impact of using full duplex in the wireless node (10; 10') on a neighboring wireless node (20; 20', 30; 30 '); and

wherein the wireless node (10; 10') is configured to decide whether to use full duplex in the wireless node (10; 10') based on the estimated impact.

13. The wireless node of claim 12, wherein the wireless node (10; 10') is configured to estimate the impact on a neighboring wireless node (20; 20', 30; 30') using full duplex in the wireless node (10; 10') based on at least one of:

an estimated traffic load of the wireless node (10; 10');

an estimated traffic load of a neighboring wireless node (20; 20', 30; 30');

estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30 ').

14. The wireless node of claim 13, wherein the wireless node (10; 10') is configured to decide whether to use full duplex in the wireless node (10; 10') based on a comparison of the estimated traffic load of the wireless node (10; 10') and the estimated traffic load of the neighboring wireless node (20; 20', 30; 30 ').

15. The wireless node of claim 14, wherein the wireless node (10; 10') is configured to decide whether to use full-duplex in the wireless node (10; 10') based on the estimated traffic load of the wireless node (10; 10') exceeding a certain percentage of the average of the estimated traffic loads of the neighboring wireless nodes (20; 20', 30; 30 ').

16. The wireless node according to any of claims 12 to 15, wherein the wireless node (10; 10') is configured to decide for each scheduled subframe whether to use full duplex in the wireless node (10; 10').

17. The wireless node according to any of claims 12-16, wherein the estimated traffic load of the wireless node (10; 10') is based on one of:

resource utilization in the wireless node (10; 10');

a throughput of data traffic in the wireless node (10; 10').

18. The wireless node of any of claims 12 to 17, wherein the estimated traffic load of the neighboring wireless node (20; 20', 30; 30') is based on one of:

resource utilization in the neighboring wireless node (20; 20', 30; 30');

a throughput of data traffic in the neighboring wireless node (20; 20', 30; 30').

19. The wireless node of any of claims 12 to 18, wherein the estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30') is based on an estimate of a channel gain between the wireless node (10; 10') and the neighboring wireless node (20; 20', 30; 30').

20. The wireless node of claim 19, wherein the estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30') is based on one of:

absolute interference power measured in the neighboring wireless node (20; 20', 30; 30');

the measured power in the neighboring wireless node (20; 20', 30; 30') is relative to thermal noise.

21. The wireless node according to any of claims 12 to 20, wherein the wireless node (10; 10') is a wireless base station.

22. The wireless node according to any of claims 12 to 20, wherein the wireless node (10; 10') is a user equipment.

23. The wireless node according to any of claims 12-22, wherein the wireless node (10; 10') comprises a processor (11) and a memory (12), the memory (12) comprising instructions executable by the processor (11), whereby the processor (11) is operative to estimate an impact of using full duplex in the wireless node (10; 10') on a neighboring wireless node (20; 20', 30; 30'), and to decide whether to use full duplex in the wireless node (10; 10') based on the estimated impact.

24. The wireless node of any of claims 12 to 23, wherein the wireless node (10; 10') comprises a communication circuit (13), the communication circuit (13) being configured to receive from the neighboring wireless node (20; 20', 30; 30') at least one of:

a report of the estimated traffic load of the neighboring wireless node (20; 20', 30; 30');

a report of the estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30 ').

25. A wireless node (10; 10') for determining when full duplex is used in the wireless node (10; 10') for communicating in a wireless communication network, wherein the wireless node (10; 10') comprises:

an estimation module (100) for estimating an impact of using full duplex in the wireless node (10; 10') on a neighboring wireless node (20; 20', 30; 30 ');

a decision module (200) for deciding whether to use full duplex in the wireless node (10; 10') based on the estimated impact.

26. The wireless node according to claim 25, wherein the estimated impact on neighboring wireless nodes (20; 20', 30; 30') using full duplex in the wireless node (10; 10') is based on at least one of:

an estimated traffic load of the wireless node (10; 10');

an estimated traffic load of a neighboring wireless node (20; 20', 30; 30');

estimated interference generated by the wireless node (10; 10') in the neighboring wireless node (20; 20', 30; 30 ').

27. A computer program (14) comprising instructions which, when executed by at least one processor (11), cause the processor(s) to estimate an impact on a neighboring wireless node (20; 20', 30; 30') using full duplex in the wireless node (10; 10'), and decide whether to use full duplex in the wireless node (10; 10') based on the estimated impact.

28. A carrier (15) comprising a computer program (14) according to claim 27, wherein the carrier is one of: an electronic signal, optical signal, electromagnetic signal, magnetic signal, electrical signal, radio signal, microwave signal, or computer readable storage medium.