WO2017058072A1

WO2017058072A1 - Network node, user equipment and methods therein for assigning resources for data traffic

Info

Publication number: WO2017058072A1
Application number: PCT/SE2015/051037
Authority: WO
Inventors: Sairamesh Nammi
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2017-04-06
Anticipated expiration: 2018-03-30

Abstract

A method performed by a network node for assigning a first User Equipment, UE, and at least one second UE, resources relating to data traffic is provided. The first UE the at least one second UE, and the network node operate in a wireless communications network. The network node assigns (202) same or partly the same resources for the first UE and at least one second UE. The network node sends (203) to the first UE one or more downlink control channels. The one or more downlink control channels comprises an indication that the first UE is assigned the same or partly the same resources as the at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE.

Description

NETWORK NODE, USER EQUIPMENT AND METHODS THEREIN FOR ASSIGNING

RESOURCES FOR DATA TRAFFIC

TECHNICAL FIELD

Embodiments herein relate to a network node, a User Equipment (UE), and methods therein. In particular, they relate to assigning the first UE and at least one second UE shared resources relating to data traffic.

BACKGROUND

Wireless devices or terminals for communication are also known as e.g. User Equipments (UE), mobile terminals, wireless terminals and/or mobile stations. Wireless devices are enabled to communicate wirelessly in a cellular communications network or wireless communication system, sometimes also referred to as a cellular radio system or cellular networks. The communication may be performed e.g. between two wireless devices, between a wireless device and a regular telephone and/or between a wireless device and a server, such as server providing video streaming service, via a Radio Access Network (RAN) and possibly one or more core networks, comprised within the cellular communications network.

Wireless devices may further be referred to as mobile telephones, cellular telephones, computers, or surf plates with wireless capability, just to mention some further examples. The wireless devices 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 another wireless device or a server.

A cellular communications network covers a geographical area which is divided into cell areas, wherein each cell area is served by a base station, e.g. a Radio Base Station (RBS), which sometimes may be referred to as e.g. eNodeB (eNB), NodeB, B node, Base Transceiver Station (BTS), or AP (Access Point), depending on the technology and terminology used. The base stations may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size. 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 wireless devices within range of the base stations. The base stations and wireless devices involved in communication may also be referred to as transmitter-receiver pairs, where the respective transmitter and receiver in a pair may refer to a base station or a wireless device, depending on the direction of the communication. Two wireless devices involved in D2D communication may also be referred to as a transmitter-receiver pair. In the context of this disclosure, the expression Downlink (DL) is used for the transmission path from the base station to a 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.

Universal Mobile Telecommunications System (UMTS) is a third generation mobile communication system, which evolved from the GSM, and is intended to provide improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) technology. UMTS Terrestrial Radio Access Network (UTRAN) is essentially a radio access network using wideband code division multiple access for communication with terminals. The 3GPP has undertaken to evolve further the UTRAN and GSM based radio access network technologies.

In 3rd 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 represents the project within the third generation partnership project, with an aim to improve the UMTS standard. 3GPP LTE radio interface offers high peak data rates, low delays and increase in spectral efficiencies. The LTE system supports both Frequency Division Duplex (FDD) and Time Division Duplex (TDD). This enables operators to exploit both paired and unpaired spectrum since LTE has a flexibility in bandwidth as it supports 6 bandwidths 1 .4 MHz, 3MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. In paired spectrum uplink and downlink uses a pair of separate frequency bands while in unpaired spectrum, the uplink and downlink uses alternately the same frequency band.

The LTE physical layer is designed to achieve higher data rates, and is facilitated by turbo coding/decoding, and higher order modulations such as up to 64- Quadrature Amplitude Modulation (QAM). The modulation and coding is adaptive, and depends on channel conditions. Orthogonal Frequency Division Multiple Access (OFDMA) is used for the downlink, while Single Carrier (SC) Frequency Division Multiple Access (FDMA) is used for the uplink. The main advantage of such schemes is that the channel response is flat over a sub-carrier even though the multi-path environment could be frequency selective over the entire bandwidth. This reduces the complexity involved in equalization, as simple single tap frequency domain equalizers can be used at the receiver. OFDMA allows LTE to achieve its goal of higher data rates, reduced latency and improved capacity and coverage, with reduced costs to the operator. The LTE physical layer supports Hybrid Automatic Repeat reQuest (H-ARQ), power weighting of physical resources, uplink power control, and Multiple Input Multiple Output (MIMO). By using multiple parallel data streams transmission to a single UE, data rate can be increased significantly.

In a multi-path environment, such a multiple access scheme also provides opportunities for performance enhancing scheduling strategies. Frequency Selective Scheduling (FSS) can now be used to schedule a UE over sub-carriers, or part of the bandwidth, that provides maximum channel gains to that UE and avoids regions of low channel gain. The channel response is measured and the scheduler utilizes this information to intelligently assign resources to users over parts of the bandwidth that maximize their signal-to-noise ratios and spectral efficiency. In other words, the end to end performance of a multi-carrier system like LTE relies significantly on sub-carrier allocation techniques and transmission modes.

Message Sequence Chart in LTE:

Figure 1 shows the typical message sequence chart for downlink data transfer in LTE. From a pilot signal sent 101 sent from the eNodeB (eNB) also referred to as reference signals, the UE computes channel estimates, and then computes parameters needed for Channel State Information (CSI) reporting. The CSI report comprises for example a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), Rank Information (Rl), the best sub band indices etc.

The CSI report is sent 102 by the UE to the eNB via a feedback channel either Physical Uplink Downlink control channel (PUCCH), periodic CSI reporting, or Physical Uplink Shared Channel (PUSCH), aperiodic CSI reporting. The eNB scheduler uses this information in choosing the parameters for scheduling of this particular UE. The eNB sends 103 the scheduling parameters to the UE in the downlink control channel called Physical Downlink control channel (PDCCH) or enhanced PDCCH (ePDCCH). After this, the actual data transfer 104 takes place from eNB to the UE.

Uplink Downlink control channel :

In LTE, the uplink downlink control channel carries information about HARQ-

Acknowledgement (ACK) information corresponding to the downlink data transmission, and channel state information. The channel state information typically comprises Rl, CQI, and PMI. Either PUCCH or PUSCH may be used to carry this information. Note that the PUCCH reporting is periodic and the periodicity of the PUCCH is configured by higher layers, while the PUSCH reporting is aperiodic. Here higher layers may relate to layers 2- 7 in the Open Systems Interconnect (OSI) model. Also note that there are various modes for PUCCH and PUSCH and in general it depends on the transmission mode and the formats is configured via higher layer signalling. Downlink control channel

In LTE, the downlink control channel (PDCCH) carries information, such as

Downlink Control Information (DCI), about the scheduling grants. Typically this comprises number of MIMO layers scheduled, transport block sizes, modulation for each code word, parameters related to HARQ, sub band locations and also PMI corresponding to that sub bands.

Typically, the following information is transmitted by means of the DCI format:

• Localized/Distributed Virtual Resource Block (VRB) assignment flag

• Resource block assignment

· Modulation and coding scheme

• HARQ process number

• New data indicator

• Redundancy version

• Transmit Power Control (TPC) command for PUCCH

· Downlink Assignment Index

• Precoding matrix index

• Number of layers

All DCI formats may not use transmit all the information as shown above, In general the contents of PDCCH depends on transmission mode and DCI format. Non-Orthogonal Multiple Access (NOMA) Scheme in LTE

This is also referred to as DL Multi-User Superposition Transmission (MUST) in 3GPP. Up to LTE Release 12, LTE schedules UEs on orthogonal resources. MU-MIMO has been supported from LTE Release 8, up to transmission modes 7, LTE, with added improvement when introducing Transmission Mode (TM) 9/10. In transmission mode 9 demodulation reference signals and Channel State Information (CSI) reference signals are introduced for single user MIMO, and in transmission mode 10, multiple CSI reference signals are introduced. This implies that the LTE eNB allocates the UEs on different time- frequency resources. Hence during transmission, these signals from the eNB do not interfere. Therefore, the UE is able to decode the signals. However, work is going on in 3GPP to improve the LTE/LTE-Advanced (A) downlink performance by allocating non- orthogonal resources. I.e. more than one UE is scheduled on the same time-frequency resources. The UE's with the help from eNB can remove the interference and are capable to decode the desired signals. In this way, the current LTE/LTE-A system capacity can be improved.

Non orthogonal multiple access (NOMA) scheme uses the power domain for multiple access which is one way of doing it that is discussed. There are e.g. also discussion about using different bits in the QAM symbols for different UEs, where different UEs are served at different power levels. The UEs with better channel conditions employ interference cancellation to remove the messages intended for other UEs before decoding their own.

The benefit of using NOMA can be illustrated by the following example. Consider that there is a UE close to the edge of its cell, denoted by UE-A, whose channel condition is very poor. For conventional LTE/LTE-A, an orthogonal bandwidth channel, e.g., a time slot will be allocated to this UE, and the other UEs cannot use this time slot. The key idea of NOMA is to squeeze another UE with better channel condition, denoted by UE-B, into this time slot. Since UE-A's channel condition is very poor, the interference from UE-B will not cause much performance degradation to UE-A, but the overall system throughput can be significantly improved since additional information can be delivered between the eNB and the UE-B.

In general the gains with NOMA are high. Note that for practical SINR ranges, even for full buffer, when the load of the cell, i.e. the number of UEs, is high as it is easy to pair UEs. Full buffer, is when the cell is completely loaded which means that there is always data to be scheduled in every subframe, and it is easy to pair the UEs as there is always data transmit, i.e. the cell edge UEs with a cell centre UEs. However, when the load is low it is hard to find the right pair of UEs, which reduces the overall throughput there by making NOMA unattractive, as the UEs cannot be paired since many of the UEs does not need downlink transmissions as their downlink data buffers are empty

SUMMARY

It is therefore an object of embodiments herein to further improve the performance of a wireless communications network.

According to a first aspect of embodiments herein, the object is achieved by a method performed by a network node for assigning a first User Equipment, UE, and at least one second UE, resources relating to data traffic. The first UE the at least one second UE, and the network node operate in a wireless communications network. The network node assigns same or partly the same resources for the first UE and at least one second UE. The network node sends to the first UE one or more downlink control channels. The one or more downlink control channels comprise an indication that the first UE is assigned the same or partly the same resources as the at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE.

According to a second aspect of embodiments herein, the object is achieved by a method performed by a first User Equipment, UE, for sharing resources relating to data traffic with and at least one second UE. The first UE, the at least one second UE, and a network node operate in a wireless communications network. The first UE one or more downlink control channels receives from the network node. The one or more downlink control channels comprise an indication that the first UE is assigned the same or partly the same resources as at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE. The UE then performs cancelling of interference related to the at least one second UE according to the indication.

According to a third aspect of embodiments herein, the object is achieved by a network node for assigning a first User Equipment, UE, and at least one second UE, resources relating to data traffic. The first UE, the at least one second UE, and the network node are operable in a wireless communications network, the network node is configured to:

- assign same or partly the same resources for the first UE and at least one second UE, and

- send to the first UE one or more downlink control channels comprising an indication that the first UE is assigned the same or partly the same resources as the at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE. According to a fourth aspect of embodiments herein, the object is achieved by a first User Equipment, UE, for sharing resources relating to data traffic with and at least one second UE. The first UE, the at least one second UE, and a network node operates in a wireless communications network. The first UE is configured to:

- receive from the network node, one or more downlink control channels comprising an indication that the first UE is assigned same or partly the same resources as at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE, and

- perform cancelling of interference related to the at least one second UE according to the indication.

Since the first UE receives one or more downlink control channels comprising an indication that the first UE is assigned same or partly the same resources as at least one second UE, and an indication to the first UE to cancel interference from the at least one second UE, the UE can perform cancelling of interference related to the at least one second UE according to the indication. This results in reduced co-channel interference which in turn results in that the performance of the wireless communications network is further improved. An advantage with embodiments herein is that they provide significant improvement in the system capacity as UEs are multiplexed on the same resources.

A further advantage with embodiments herein is that UE battery power can be saved as it is indicated when to remove the interference. Without this information, it has to identify these parameters by blind estimation which requires lot of computational resources.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of embodiments herein are described in more detail with reference to attached drawings in which:

Figure 1 is a signalling diagram illustrating prior art.

Figure 2 is a schematic block diagram illustrating embodiments of a communications system.

Figure 3 is a flowchart depicting embodiments of a method in a network node.

Figure 4 is a signalling diagram illustrating embodiments herein in a UE.

Figure 5 is a signalling diagram illustrating embodiments herein.

Figure 6 is a schematic block diagram illustrating embodiments herein.

Figure 7 is a signalling diagram illustrating embodiments herein.

Figure 8 is a signalling diagram illustrating embodiments herein.

Figure 9 is a signalling diagram illustrating embodiments herein.

Figure 10 is a signalling diagram illustrating embodiments herein.

Figure 1 1 is a signalling diagram illustrating embodiments herein.

Figure 12 is a flow chart illustrating embodiments herein.

Figure 13 is a flow chart illustrating embodiments herein.

Figure 14 is a schematic block diagram embodiments of a network node.

Figure 15 is a schematic block diagram embodiments of a UE.

DETAILED DESCRIPTION

Figure 2 depicts an example of a wireless communications network 100 in which embodiments herein may be implemented. Embodiments herein are described in particular for operation of E-UTRA/LTE/LTE-A, UTRA/HSPA FDD systems. The wireless communications network100 implementing embodiments herein may however be a wireless communication network relating to any radio Access Technology (RAT) or multi- RAT system where a UE operates using MIMO, e.g. LTE TDD, GSM/ GSM EDGE Radio Access Network (GERAN), Wi Fi, Wireless Local Area network (WLAN), WiMax, Code Divisional Multiple Access (CDMA) 2000, LTE-NX, Massive MIMO systems etc. EDGE is the abbreviation for Enhanced Data Rates for GSM Evolution, and NX LTE means next- generation 5G radio access technology. A plurality of network nodes operates in the wireless communications network 100 whereof one, a network node 110 is depicted in Figure 2. The network node 1 10 may for example refer to any type of network node serving a UE and/or being connected to other network nodes or network elements or any radio node from where a UE receives signals. Examples of the network node 1 10 are Node B, Base Station (BS), Multi-Standard Radio (MSR) radio node such as MSR BS, eNode B (eNB), network controller, Radio Network Controller (RNC), Base Station Controller (BSC), relay, donor node controlling relay, Base Transceiver Station (BTS), Access Point (AP), Transmission Point, transmission node, Remote Radio Unit (RRU) node and Remote Radio Head (RRH) node in a Distributed Antenna System (DAS) system.

A first UE 121 and at least one second UE 122 operate in the wireless

communications network 100. The first UE 121 is capable of being served by the network node 1 10. The first UE 121 and the second UE 122 and their features may be used interchangeably herein, they are referred to as the first end the second UE to explain the scenarios herein.

The term UE when used herein may e.g. refer to a wireless device, a mobile wireless terminal or a wireless terminal, a mobile phone, a target device, a Device to Device (D2D) UE, a computer such as e.g. a laptop, a Personal Digital Assistants (PDAs) or an iPAD, a tablet computer, sometimes referred to as a surf plate, with wireless capability, a smart phone, Laptop Embedded Equipment (LEE), Laptop Mounted

Equipment (LME), Universal Serial Bus (USB) dongles or any other radio network units capable to communicate over a radio link in a wireless communications network. Please note the term UE used in this document also covers other wireless devices such as Machine to machine (M2M) devices.

The embodiments are applicable to single carrier as well as to MultiCarrier (MC) or Carrier Aggregation (CA) operation of the first UE 121 and/or any of the at least one second UE 122 in conjunction with MIMO in which the UE is able to receive and/or transmit data to more than one serving cells using MIMO. The term carrier aggregation (CA) is also called (e.g. interchangeably called) "multi-carrier system", "multi-cell operation", "multi-carrier operation", "multi-carrier" transmission and/or reception.

Some embodiments herein relate to methods to transmit a downlink control channel in a Non-Orthogonal Multiple Access System.

Example embodiments herein relate to wireless communication systems and in more general indicating interferer information in a non-orthogonal multiples access systems. Some example embodiments herein provide a hybrid system between NOMA and the conventional orthogonal multiple access system where the network node 1 10 such as an eNB pairs UEs such as the first UE 121 and at least one second UE (122) according to NOMA in some Transmit Time Intervals (TTIs), and in other TTIs schedules UEs individually according to the conventional orthogonal multiple access system. The network node 1 10 conveys this information to the intended UEs such as the first UE 121 and at least one second UE (122) through a downlink control channel, where it indicates any one more out of:

• Scheduling parameters of the intended UE,

• Multiple access information, e.g. a single bit to indicate whether this UE is paired with some other UE's or not.

• Assisting information for canceling interference.

Example embodiments of a method performed by the network node 1 10 for assigning the first UE 121 and at least one second UE 122 resources relating to data traffic, will be described with reference to a flowchart depicted in Figure 3. The method will be described in a more general way first, and will be explained and exemplified more in detail later on. As mentioned above, the first UE 121 the at least one second UE 122, and the network node 1 10 operate in the wireless communications network 100.

The method comprises the following actions, which actions may be taken in any suitable order. Actions that are optional are presented in dashed boxes in Figure 3.

Action 301

In an example scenario the network node 1 10 wishes to find UEs to pair for sharing resources in order to improve overall system throughput To decide this the network node 1 10 requires information about channel condition from the respective UEs connected to the network node 1 10. Thus, the network node 1 10 may decide to pair the first UE 121 and at least one second UE 122 for sharing same or partly the same resources based on information about estimated channel conditions received from UEs connected to the network node including the first UE 121 and at least one second UE 122. This may for example be performed by observing CQIs reported, or based on a path loss computed either in the downlink direction or uplink direction.

Action 302

According to the example scenario the network node 1 10 has decided to pair the first UE 121 and at least one second UE 122. The network node 1 10 assigns same or partly the same resources for the first UE 121 and at least one second UE 122. Same or partly the same resources refers to that in an OFDMA system some of the scheduled resource blocks are overlapped and some other are not overlapped.

The assigning of the same or partly the same resources for the first UE 121 and at least one second UE 122, may be performed when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a first threshold. The channel conditions may relate to long term channel conditions. Long term channel means the channel is averaged out, this implies only path loss.

An example of first threshold value, here referred to as CQI_th, may relate to the following: For example when the CQI indexl is 15 and the CQI index 2 is 2. Then CQI1 - CQI2 > CQI_th, for example CQI_th is set to 10. This means, only pair UEs whose CQI difference is greater than 10.

In some embodiments any one or more out of the first UE 121 and second UE 122 may be NOMA capable, and the first UE 121 being assigned the same or partly the same resources as at least one second UE 122 relates to NOMA.

That the network node 1 10 assigns resources to be shared by the first UE 121 and at least one second UE 122 means that resources may be shared between the first UE 121 and one second UE 122 or may be shared between the first UE 121 and several second UEs 122.

Action 303

To inform the first UE 121 it is paired for sharing resources, the network node 1 10 sends one or more downlink control channels to the first UE 121 . The one or more downlink control channels comprises an indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, and an indication to the first UE 121 to cancel interference from the at least one second UE 122.

The indication to the first UE 121 to cancel interference from the at least one second UE 122 may in some embodiments comprise information to assist the first UE 121 to cancel interference of the at least one second UE 122. The assisting information may be the indication to cancel interference from the at least one second UE 122. In some other embodiments no assisting information is provided. In the latter embodiments it is expected that the first UE 121 shall cancel the interference by blind decoding, which will be explained below.

Thus, the indication to the first UE 121 to cancel interference from the at least one second UE 122 comprises assisting information relating to any one or more out of: An identifier of the second UE 122, scheduling information of the second UE 122, and a transmission mode of the second UE 122. The scheduling information may e.g. comprise modulation, number of resource blocks and their location, transport block size, precoding, it is like full or partial information sent in the downlink control channel.

In some other embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, is the indication to the first UE 121 to cancel interference from the at least one second UE 122.

As mentioned above, one or more downlink control channels may be used for the indications. So in some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122 is comprised in a first downlink control channel, and the indication to the first UE 121 to cancel interference from the at least one second UE 122 is comprised in a second downlink control channel. Action 304

The network node 1 10 may in some embodiments also inform the at least one second UE 122 that it is paired for sharing resources. This action is performed in a way similar to Action 303 above.

In some embodiments, the network node 1 10 sends to the respective at least one second UE 122 in one or more downlink control channels, an indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, and an indication to the second UE 122 to cancel interference from the first UE 122.

The sending to the respective at least one second UE 122 in one or more downlink control channels may not always be performed, but may e.g. be performed when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a second threshold.

Similar as to Action 303 above, the indication to the second UE 122 to cancel interference from the first UE 121 may in some embodiments comprise information to assist the second UE 122 to cancel interference of the first UE 121 . The assisting information may be the indication to cancel interference from the first UE 121 . In some other embodiments no assisting information is provided. In the latter embodiments it is expected that the second UE 122 shall cancel the interference by blind decoding, which will be explained below.

Therefore, in some embodiments the indication to the second UE 122 to cancel interference from the first UE 121 comprises assisting information relating to any one or more out of: An identifier of the first UE 121 , scheduling information of the first UE 121 , and a transmission mode of the first UE 121 . The scheduling information may e.g.

comprise modulation, number of resource blocks and their location, transport block size, precoding, it is like full or partial information sent in the downlink control channel.

In some other embodiments the indication that the first UE 121 is assigned the same or partly the same resources as the second UE 122, is the indication to the second UE 122 to cancel interference from the at first UE 121 .

As mentioned above, one or more downlink control channels may be used for the indications. So in some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the second UE 122 may be comprised in a first downlink control channel, and the indication to the second UE 122 to cancel interference from the first UE 121 may be comprised in a second downlink control channel. Action 305

The network node 1 10 may in some embodiments, not send any downlink control channel to inform the at least one second UE 122 that it is paired for sharing resources, but instead just send a legacy downlink control channel. The network node 1 10 may decide to send to a second UE 122 out of the at least one second UE 122 a legacy downlink control channel based on channel conditions. The channel conditions may comprise any one or more out of: channel quality indicators, and path loss. It may be decided to send a legacy downlink control channel to a second UE 122 when the channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a third threshold. The threshold may be similar to the first threshold described above. Action 306

The network node 1 10 may send to the second UE 122 out of the at least one second UE 122 a legacy downlink control channel, when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above the third threshold.

5

Example embodiments of a method performed by a first UE 121 for sharing resources relating to data traffic with and at least one second UE 122, will be described with reference to a flowchart depicted in Figure 4. Note that the method in the first UE 10 121 may interchangeably be performed by the second UE 122. The method will be

described in a more general way first, and will be explained and exemplified more in detail later on. As mentioned above, the first UE 121 the at least one second UE 122, and the network node 1 10 operate in a wireless communications network 100.

The method comprises the following actions, which actions may be taken in any 15 suitable order. Actions that are optional are presented in dashed boxes in Figure 4.

Action 401

The first UE 121 may send information about estimated channel conditions to a network node 1 10. In an example scenario the network node 1 10 wishes to find UEs such 20 as the first UE 121 and the at least one second UE 122 to pair for sharing resources in order to improve overall system throughput. This information about the about estimated channel conditions may be a basis for the network node 1 10 to decide whether or not to pair the UEs.

25 Action 402

According to the example scenario, the network node 1 10 has decided to pair the UE 121 with the at least one second UE 122. The first UE 121 receives from the network node 1 10, one or more downlink control channels comprising an indication that the first UE 121 is assigned the same or partly the same resources as at least one second UE 30 122, and an indication to the first UE 121 to cancel interference from the at least one

second UE 122.

As mentioned above, the resources to be shared by the first UE 1 21 and at least one second UE 122 means that resources may be shared between the first UE 121 and one second UE 122 or may be shared between the first UE 121 and several second UEs 35 122. As mentioned above, one or more downlink control channels may be used for the indications. So in some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122 is comprised in a first downlink control channel, and wherein the indication to the first UE 121 to cancel interference from the at least one second UE 122 is comprised in a second downlink control channel.

The indication from the network node 1 10 to the first UE 121 to cancel interference from the at least one second UE 122 may in some embodiments comprise information to assist the first UE 121 to cancel interference of the at least one second UE 122. The assisting information may be the indication to cancel interference from the at least one second UE 122. In some other embodiments no assisting information is provided. In the latter embodiments it is expected that the first UE 121 shall cancel the interference by blind decoding, which will be explained below.

Thus the indication to the first UE 121 to cancel interference from the at least one second UE 122 may comprise assisting information relating to any one or more out of: an identifier of the second UE 122, scheduling information of the second UE 122, and a transmission mode of the second UE 122.

The indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, may in some embodiments be the indication to the first UE 121 to cancel interference from the at least one second UE 122.

The first UE 121 may be Non NOMA. In these embodiments, the first UE 121 may be assigned the same or partly the same resources as at least one second UE 122 relating to NOMA. Action 403

In some embodiments wherein assistance information is received, the UE 121 decodes the assisting information. This assisting information will be used for cancelling the interference related to the at least one second UE 122. Action 404

The UE 121 performs cancelling of interference related to the at least one second UE 122 according to the indication. The interference may be cancelled as either pre- decoding or post decoding. In pre -decoding the interference signal is cancelled before decoding, also referred to as channel decoding, while in post decoding, the interference signal is cancelled after decoding also referred to as channel decoding. In some embodiments wherein assistance information is received, the cancelling of interference related to the at least one second UE 122 may be performed based on the assisting information.

In some specific first embodiments, the UE 121 has decoded the assisting information, and when the cancelling of interference related to the at least one second UE 122 is performed based on the assisting information, the UE 121 will decode the traffic channel intended for the first UE 121 according to Action 405 below.

In a specific second embodiment, the UE 121 first tries to decode the traffic channel intended for the first UE 121 . However, when this failures it is a trigger, or an indication for the first UE 121 to cancel the interference related to the at least one second UE 122. Thus, in these embodiments the cancelling of the interference related to the at least one second UE 122 is performed when decoding the traffic channel intended for the first UE 121 failures. Action 405

According to an example scenario the first UE 121 decodes the traffic channel intended for the first UE 121 .

In the specific first embodiments, the UE 121 has decoded the assisting information, and when the cancelling of interference related to the at least one second UE 122 is performed based on the assisting information. The UE 121 then decodes the traffic channel intended for the first UE 121 .

In the specific second embodiment, the UE 121 has first tried to decode the traffic channel intended for the first UE 121 . However, when this failures it is a trigger, or an indication for the first UE 121 to cancel the interference related to the at least one second UE 122. Thus, the first UE 121 first cancels the interference related to the at least one second UE 122 when decoding the traffic channel intended for the first UE 121 failures. The first UE 121 then decodes the traffic channel intended for the first UE 121 .

Embodiment's herein will now be further described and explained. The text below is applicable to and may be combined with any suitable embodiment described above.

Figure 5 shows a message sequence chart of two UEs the first UE, referred to as UE1 in Figure 5 and Figures below, and one of the at least one second UEs 122, referred to as UE2 in Figure 5 and Figures below, which are connected to the network node 1 10 referred to as eNB in Figure 5 and figures below. The network node sends 501 reference signals. Both the UEs send 502 the CSI from the reference signals in the uplink downlink control channel as explained above. E.g. a scheduler in the network node 1 10 decides to 5 pair the first UE 121 and the second UE 122, where the second UE 122 has long term SINR, or path loss, that is less than for the first UE 121 in a TTI e.g. TTIt. What is meant by pairing is that the first UE 121 and the second UE 122 are allocated same resources or at least parts of the resources are same between these two UEs. As explained above the eNB such as the network node 1 10 needs to send scheduling information to the

10 corresponding UEs, here the first UE 121 and the second UE 122 before downlink

transmission. According to embodiments herein, the network node 1 10 sends a downlink control channel where there is an indication of multiple access schemes and the assisting information for cancelling the interference. This means in other words that in some embodiments, the network node 1 10 sends 503 the assisting information along with

15 the multiple access information in the downlink control channel. The traffic channel is then sent 504 accordingly.

The downlink control channel is shown in Figure 6. Figure 6 shows a downlink control channel structure according to embodiments herein. The first part 610 is same as

20 that of legacy downlink control channel as explained above. The second part 620 and the third part 630 are the fields according to embodiments herein. The second part 620 comprises multiple access information that indicates whether the intended first UE 121 is scheduled along with the other, i.e. second UE(s) 122, in other word, an indication that the first UE 121 is assigned the same or partly the same resources as at least one second UE

25 122. The third part 630 comprises the assisting information which may be the second UE 122 UE Cell - Radio Network Temporary Identifier, (C-RNTI), transmission mode etc., or vice versa. This is may be the indication to the first UE 121 to cancel interference from the at least one second UE 122. The type of assisting information is explained below. This is quite specific way of ordering the information, other setups may also be considered.

30 Figure 7 shows another embodiment of message sequence chart. Action 701 , 702 and 704 in Figure 7 corresponds to Actions 501 , 502 and 504 described above. In this embodiment the first network node 1 10 referred to as eNB in Figure 7 1 10 sends 703a the assisting information along with the multiple access information in the downlink control channel to the first UE 121 , and sends 703b legacy downlink control channel

35 without any multiple access information and assistance information to the second UE 122 referred to as UE2 in Figure 7, which is far away, from the eNB, which means that path loss is very high. This is because if the eNB sense that the UE2 cannot get any gain with interference cancellation, then it is useless to transmit assisting information to that UE. For example the eNB may sense that CQI2<CQI1 +K, where CQI1 , CQI2 are the channel quality indicators for the respective UEs and K is a positive constant, or in another example if the PL2<PL1 +M, where PL1 and PL2 are the respective path losses of the UEs and M is a positive constant.

Thus, according to embodiments herein, the network node 1 10 sends a downlink control channel where there is an indication of multiple access schemes and the assisting information for cancelling the interference to the first UE 121 and legacy downlink control channel to the second UE 122.

The network node 1 1 may decide to send the legacy downlink control channel e.g. based on the channel quality indicators and/or the path loss. Figure 8 shows another embodiment of the method. In this embodiment the downlink control channel information, in this embodiment referred to as the first downlink control channel 803, carriers a multiple access information field only, and the assisting information is sent in a separate channel, in this embodiment referred to as the second downlink control channel 804. Action 801 , 802 and 805 in Figure 8

corresponds to respective Actions 501 , 502 and 504 described above. The advantage of this embodiment of the method is that instead of sending a larger block length for the downlink control channel, it may be sent in 2 packets.

Embodiments as seen in Figure 9 is similar of Figure 8 in that it comprises two downlink control channels, the first downlink control channel 903a and the second downlink control channel 904 for the first UE 121 and a legacy downlink control channel 903b for the second UE 122. Thus the network node 1 10 sends to the first UE 121 the first downlink control channel 903a comprising an indication of multiple access scheme, the second downlink control channel 904 which carries the assisting information for cancelling the interference and to the at least one second UE 122, a legacy downlink control channel. Action 901 , 902 and 905 in Figure 9 corresponds to respective Actions 501 , 502 and 504 described above.

Figures 10 shows other variants of Figures 8 and 9, where the network node 1 10 indicates 1003 multiple access information in the downlink control channel to the first UE 121 and the second UE 122. However the network node 1 10 does not send the assisting information. It is expected that the respective first UE 121 and second UE 122 cancels the interference by blind decoding. A further embodiment is to only send a user id of the interfering UE. Then let the UE that want to cancel blindly detect DCI from that UE. Figure 10 shows a message sequence chart for the proposed idea with blind decoding.

Action 1001 , 1002 and 1004 in Figure 10 corresponds to Actions 501 , 502 and 504 described above.

Figure 11 shows a further variant of Figures 8 and 9, where the network node 1 10 indicates 1103a multiple access information in the downlink control channel to the first UE 121 and a legacy downlink control channel 113b for the second UE 122. However the network node 1 10 does not send the assisting information to the first UE 121 . It is expected that the first UE 121 cancels the interference by blind decoding. Figure 1 1 shows a message sequence chart for the variant of the embodiments with blind decoding Action 1101 , 1102 and 1104 in Figure 10 corresponds to Actions 501 , 502 and 504 described above.

Embodiments herein provide a method at a transmitting node such as the network node 1 10, to convey the assisting information:

In these embodiments, the network node 1 10 will send the assisting information to the first UE 121 in the downlink control channel as explain above. In these embodiments, the assisting information comprises any one or more out of

- A UE identifier such as H-RNTI and Transmission mode TM of the at least one second UE 122. In this example the interfering second UE identifier, which may be 16 bit, referred to as H-RNTI, is transmitted along with the transmission mode of the interfering second UE 122, and

- Scheduling information and a Transmission mode (TM). In this example, the network sends the scheduling information as described in section 2.1 .4 of the interfering second UE 122 along with the transmission mode.

Note that in this example, only a 2 UE case is described, however this is straight forward to extend this same concept for more than 2 UEs, i.e. at least one second UE 122 is represented by multiple second UEs 122.

Embodiments herein provide a method at a receiving node such as the first UE 121 or one of the at least one second UE 122, to decode 1201 , 1301 the received signal: In this example a first and a second, UE receiver algorithms, are described through flow charts. The first algorithm is as shown in Figure 12, where the first UE after

detecting 1202 that the NOMA is enabled (MA=1 ), decode 1203 the assisting

information and tries to remove 1204 the interference from the received signal by 5 reconstructing the interference signal. Then it tries to decode 1205 the desired signal.

However, if MA is not 1206 equal to 1 , then the first UE 121 directly tries to decode 1207 the traffic channel.

The example according to the second algorithm as shown in Figure 13, where the first UE 121 after detecting 1302 that the NOMA is enabled (MA=1 ), tries to decode 10 1303 its own traffic channel. If this is successful 1304 the cycle stops. If this is a failure 1305 then it tries to remove 1306 the interference from the received signal. Then it tries to decode 1307 the traffic channel. When first UE 121 detects 1308 that the NOMA is not enabled, it directly tries to decode 1309 the traffic channel.

15 In another embodiment the first or second UE 121 , 122 implements these two

receiver algorithms and choose one based on certain conditions for example path loss For example a cell edge UE choose receiver 2 and a cell center UE chooses receiver 1 .

20 To perform the method actions for assigning the first UE 121 and at least one

second UE 122, resources relating to data traffic described above, the network node 1 10 may comprise the following arrangement depicted in Figure 14. As mentioned above, the first UE 121 , the at least one second UE 122, and the network node 1 10 are operable in the wireless communications network 100.

25

The network node 1 10 is configured to, e.g. by means of an assigning module 1410 configured to, assign same or partly the same resources for the first UE 121 and at least one second UE 122.

The network node 1 10 may further be configured to , e.g. by means of the 30 assigning module 1410 configured to, assign the same or partly the same resources for the first UE 121 and at least one second UE 122, when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a first threshold .

The network node 1 10 is further configured to, e.g. by means of a sending module 35 1420 configured to, send to the first UE 121 one or more downlink control channels comprising an indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, and an indication to the first UE 121 to cancel interference from the at least one second UE 122.

In some embodiments, the indication to the first UE 121 to cancel interference from the at least one second UE 122 is adapted to comprise assisting information relating to any one or more out of: an identifier of the second UE 122, scheduling information of the second UE 122, and a transmission mode of the second UE 122.

The network node 1 10 may further be configured to, e.g. by means of the sending module 1420 further configured to, comprise the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122 in a first downlink control channel, is and comprise the indication to the first UE 121 to cancel interference from the at least one second UE 122 in a second downlink control channel.

In some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, is the indication to the first UE 121 to cancel interference from the at least one second UE 122.

The network node 1 10 may further be configured to, e.g. by means of the sending module 1420 further configured to, send to the respective at least one second UE 122 in one or more downlink control channels, an indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122, and an indication to the second UE 122 to cancel interference from the first UE 122.

The network node 1 10 may further be configured to, e.g. by means of the sending module 1420 further configured to, send to the respective at least one second UE 122 in one or more downlink control channels when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a second threshold.

In some embodiments, the indication to the second UE 122 to cancel interference from the first UE 121 is adapted to comprise assisting information relating to any one or more out of: an identifier of the first UE 121 , scheduling information of the first UE 121 , and a transmission mode of the first UE 121 .

In some embodiments, the indication that the first UE 121 assigned the same or partly the same resources as the second UE 122 is comprised in a first downlink control channel, and wherein the indication to the second UE 122 to cancel interference from the first UE 121 is comprised in a second downlink control channel. In some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the second UE 122, is adapted to be the indication to the second UE 122 to cancel interference from the at first UE 121 .

The network node 1 10 may further be configured to, e.g. by means of the sending module 1420 further configured to, send to the respective at least one second UE 122 a legacy downlink control channel, when channel conditions of the first UE 121 minus channel conditions of the second UE 122 is above a third threshold.

The channel conditions may be adapted to comprise any one or more out of:

channel quality indicators, and path loss.

Embodiments herein further relates to a computer program comprising instructions, which when executed by at least one processor 1450, cause the at least one processor 1450 to perform the above actions 301 -306. The at least one processor 1450 may be comprised in the network node 1 10 or any other node, or may be distributed in a number of nodes related to the wireless communications network 100.

Embodiments herein yet further relates to a carrier comprising the computer program. The carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.

Thus the embodiments herein may be implemented through one or more processors, such as the processor 1450 in the network node 1 10 depicted in Figure 14, 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 network node 1 10. 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 network node 1 10. The network node 1 10 may further comprise a memory 1460 comprising one or more memory units. The memory 1460 comprises instructions executable by the processor 1450.

The memory 1460 is arranged to be used to store e.g. information about assigned resources, data, configurations, and applications to perform the methods herein when being executed in the network node 1 10.

Those skilled in the art will also appreciate that the modules in the network node 1 10, 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 1460, that when executed by the one or more processors such as the processor 1450 as described above. 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 for sharing resources relating to data traffic with at least one second UE 122, the first UE 121 may comprise the following arrangement depicted in Figure 15. As mentioned above, the at least one second UE 122, and a network node 1 10 operates in a wireless communications network 100.

The first UE 121 is configured to, e.g. by means of a receiving module 1510 configured to, receive from the network node 1 10, one or more downlink control channels comprising an indication that the first UE 121 is assigned same or partly the same resources as at least one second UE 122, and an indication to the first UE 121 to cancel interference from the at least one second UE 122.

In some embodiments, the indication to the first UE 121 to cancel interference from the at least one second UE 122 is adapted to comprise assisting information relating to any one or more out of: an identifier of the second UE 122, scheduling information of the second UE 122, and a transmission mode of the second UE 122. The cancelling of interference related to the at least one second UE 122 may be adapted to be performed based on the assisting information.

In some embodiments, the indication that the first UE 121 is assigned the same or partly the same resources as the at least one second UE 122 is adapted to be comprised in a first downlink control channel, and the indication to the first UE 121 to cancel interference from the at least one second UE 122 is adapted to be comprised in a second downlink control channel.

In some embodiments, the first UE 121 is configured to be NOMA capable, and the first UE 121 being assigned the same or partly the same resources as at least one second UE 122 relates to NOMA.

The first UE 121 is further configured to, e.g. by means of an interference cancellation module 1520 configured to, perform cancelling of interference related to the at least one second UE 122 according to the indication. The first UE 121 may further be configured to, e.g. by means of a decoding module 1530 configured to, decode the assisting information.

The first UE 121 may further be configured to, e.g. by means of the decoding module 1530 configured to, when the cancelling of interference related to the at least one second UE 122 is performed, decode the traffic channel intended for the first UE 121 .

The first UE 121 may further be configured to e.g. by means of the interference cancellation module 1520 configured to, cancel interference related to the at least one second UE 122 when decoding the traffic channel intended for the first UE 121 failures

The first UE 121 may further be configured to, e.g. by means of the decoding module 1530 configured to, decode the traffic channel intended for the first UE 121 .

Embodiments herein further relates to a computer program comprising instructions, which when executed by at least one processor 1540, cause the at least one processor 1540 to perform the above actions 401 -405. The at least one processor 1540 may be comprised in the first UE 121 or any other node, or may be distributed in a number of nodes related to the wireless communications network 100.

Embodiments herein yet further relates to a carrier comprising the computer program. The carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium. The embodiments herein may be implemented through one or more processors, such as a processor 1540 in the first UE 121 depicted in Figure 15, 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 first UE 121 . 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 UE 121 .

The first UE 121 may further comprise a memory 1550 comprising one or more memory units. The memory 1550 comprises instructions executable by the processor 1540.

The memory 1550 is arranged to be used to store e.g. information about assigned resources, data, configurations, and applications to perform the methods herein when being executed in the first UE 121 .

Those skilled in the art will also appreciate that the modules in the first UE 121 , 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 1550, that when executed by the one or more processors such as the processor 1540 as described above. 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, which is defined by the appending claims. 1 ABBREVIATIONS

Explain all abbreviations and acronyms used in the document. Abbreviation Explanation

HARQ Hybrid automatic repeat request

CRC Cyclic redundancy check

NAK non-acknowledgement

ACK Acknowledgement

CC Chase combining

IR Incremental Redundancy

UE User Equipment

CQI Channel quality information

TTI Transmit Time Interval

PCI Precoding control index

O&M Operational and Maintenance

OSS Operational Support Systems

SON Self Organizing Network

RRC Radio resource control

MAC Medium access control

BS Base Station

CID Cell Identity

DAS Distributed Antenna System

DL Downlink

ID Identity

L1 Layer 1

L2 Layer 2

LTE Long Term Evolution

MAC Medium Access Control

OFDM Orthogonal Frequency Division Multiplexing

PBCH Physical Broadcast Channel

PCFICH Physical Control format Indicator

PDCCH Physical Downlink control channel

PDSCH Physical Downlink Shared Channel

PHICH Physical Hybrid ARQ Indicator Channel RB Resource Block

RRH Remote radio head

RRM Radio Resource Management

RRU Remote radio unit

RSRQ Reference signal received quality

RSRP Reference signal received power

UE User Equipment

UL Uplink

Claims

CLAIMS A method performed by a network node (1 10) for assigning a first User Equipment, UE, (121 ) and at least one second UE (122), resources relating to data traffic, wherein the first UE (121 ) the at least one second UE (122), and the network node (1 10) operate in a wireless communications network (100), the method comprising: assigning (302) same or partly the same resources for the first UE (121 ) and at least one second UE (122),

sending (303) to the first UE (121 ) one or more downlink control channels comprising an indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), and an indication to the first UE (121 ) to cancel interference from the at least one second UE (122).

The method according to claim 1 , wherein the assigning (302) of the same or partly the same resources for the first UE (121 ) and at least one second UE (122), is performed when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a first threshold.

The method according to any of the claims 1 -2, wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) comprises assisting information relating to any one or more out of: an identifier of the second UE (122), scheduling information of the second UE (122), and a transmission mode of the second UE (122).

The method according to any of the claims 1 -3, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122) is comprised in a first downlink control channel, and wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) is comprised in a second downlink control channel.

The method according to claim 1 -2, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), is the indication to the first UE (121 ) to cancel interference from the at least one second UE (122).

6. The method according to any of the claims 1 -5, further comprising:

sending (304) to the respective at least one second UE (122) in one or more downlink control channels, an indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), and an indication to the second UE (122) to cancel interference from the first UE (122).

7. The method according to any of the claims 1 -6, wherein the sending (304) to the respective at least one second UE (122) in one or more downlink control channels is performed when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a second threshold.

8. The method according to any of the claims 6-7, wherein the indication to the

second UE (122) to cancel interference from the first UE (121 ) comprises assisting information relating to any one or more out of: an identifier of the first UE (121 ), scheduling information of the first UE (121 ), and a transmission mode of the first UE (121 ).

9. The method according to any of the claims 6-8, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the second UE

(122) is comprised in a first downlink control channel, and wherein the indication to the second UE (122) to cancel interference from the first UE (121 ) is comprised in a second downlink control channel. 10. The method according to any of the claims 6-8, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the second UE (122), is the indication to the second UE (122) to cancel interference from the at first UE (121 ). 1 1 . The method according to any of the claims 1 -10, wherein any one or more out of the first UE (121 ) and second UE (122) are Non Orthogonal Multiple Access, NOMA, capable, and wherein the first UE (121 ) being assigned the same or partly the same resources as at least one second UE (122) relates to NOMA. 12. The method according to any of the claims 1 -5, further comprising: sending (306) to a second UE (122) out of the least one second UE (122) a legacy downlink control channel, when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a third threshold. 13. The method according to claim 6, wherein the channel conditions comprises any one or more out of: channel quality indicators, and path loss.

14. A method performed by a first User Equipment, UE, (121 ) for sharing resources relating to data traffic with at least one second UE (122), wherein the first UE (121 ) the at least one second UE (122), and a network node (1 10) operate in a wireless communications network (100), the method comprising:

receiving (402) from the network node (1 10), one or more downlink control channels comprising an indication that the first UE (121 ) is assigned the same or partly the same resources as at least one second UE (122), and an indication to the first UE (121 ) to cancel interference from the at least one second UE (122), performing (404) cancelling of interference related to the at least one second UE (122) according to the indication.

15. The method according to claim 14, wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) comprises assisting information relating to any one or more out of: an identifier of the second UE (122), scheduling information of the second UE (122), and a transmission mode of the second UE (122), and wherein the cancelling of interference related to the at least one second UE (122) is performed (404) based on the assisting information.

16. The method according to any of the claims 14-15, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122) is comprised in a first downlink control channel, and wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) is comprised in a second downlink control channel.

17. The method according to claim 14-16, further comprising:

decoding (403) the assisting information, and when the cancelling of interference related to the at least one second UE (122) is performed, decoding (405) the traffic channel intended for the first UE (121 ). 18. The method according to claim 14-16, wherein the (404) cancelling of interference related to the at least one second UE (122) is performed when decoding the traffic channel intended for the first UE (121 ) failures, the method further comprising: decoding (405) the traffic channel intended for the first UE (121 ). 19. The method according to claim 14, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), is the indication to the first UE (121 ) to cancel interference from the at least one second UE (122). 20. The method according to any of the claims 14-19, wherein the first UE (121 ) is Non Orthogonal Multiple Access, NOMA, capable, and wherein the first UE (121 ) being assigned the same or partly the same resources as at least one second UE (122) relates to NOMA. 21 . A network node (1 10) for assigning a first User Equipment, UE, (121 ) and at least one second UE (122), resources relating to data traffic, wherein the first UE (121 ) the at least one second UE (122), and the network node (1 10) are operable in a wireless communications network (100), the network node (1 10) being configured to:

- assign same or partly the same resources for the first UE (121 ) and at least one second UE (122),

- send to the first UE (121 ) one or more downlink control channels comprising an indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), and an indication to the first UE (121 ) to cancel interference from the at least one second UE (122).

22. The network node (1 10) according to claim 21 , wherein the network node (1 10) is configured to assign the same or partly the same resources for the first UE (121 ) and at least one second UE (122), when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a first threshold .

23. The network node (1 10) according to any of the claims 21 -22, wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) is adapted to comprise assisting information relating to any one or more out of: an identifier of the second UE (122), scheduling information of the second

UE (122), and a transmission mode of the second UE (122).

24. The network node (1 10) according to any of the claims 21 -23, further being

configured to:

comprise the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122) in a first downlink control channel, is and

comprise the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) in a second downlink control channel.

25. The network node (1 10) according to claim 21 -22, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), is the indication to the first UE (121 ) to cancel interference from the at least one second UE (122).

26. The network node (1 10) according to any of the claims 21 -25, further being

configured to:

- send to the respective at least one second UE (122) in one or more downlink control channels, an indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122), and an indication to the second UE (122) to cancel interference from the first UE (122).

27. The network node (1 10) according to any of the claims 21 -26, wherein the network node (1 10) further is configured to send to the respective at least one second UE

(122) in one or more downlink control channels when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a second threshold.

28. The network node (1 10) according to any of the claims 26-27, wherein the

indication to the second UE (122) to cancel interference from the first UE (121 ) is adapted to comprise assisting information relating to any one or more out of: an identifier of the first UE (121 ), scheduling information of the first UE (121 ), and a transmission mode of the first UE (121 ).

29. The network node (1 10) according to any of the claims 21 -28, wherein the

indication that the first UE (121 ) assigned the same or partly the same resources as the second UE (122) is comprised in a first downlink control channel, and wherein the indication to the second UE (122) to cancel interference from the first UE (121 ) is comprised in a second downlink control channel.

30. The network node (1 10) according to any of the claims 26-27, wherein the

indication that the first UE (121 ) is assigned the same or partly the same resources as the second UE (122), is adapted to be the indication to the second UE (122) to cancel interference from the at first UE (121 ).

31 . The network node (1 10) according to any of the claims 21 -30, wherein any one or more out of the first UE (121 ) and second UE (122) are Non Orthogonal Multiple Access, NOMA, capable, and wherein the first UE (121 ) being assigned the same or partly the same resources as at least one second UE (122) relates to NOMA.

32. The network node (1 10) according to any of the claims 21 -25, further being

configured to:

- send to a second UR (122) out of the at least one second UE (122) a legacy downlink control channel, when channel conditions of the first UE (121 ) minus channel conditions of the second UE (122) is above a third threshold.

33. The method according to claim 32, wherein the channel conditions is adapted to comprise any one or more out of: channel quality indicators, and path loss.

34. A first User Equipment, UE, (121 ) for sharing resources relating to data traffic with at least one second UE (122), wherein the first UE (121 ), the at least one second UE (122), and a network node (1 10) operates in a wireless communications network (100), the first UE (121 ) being configured to:

- receive from the network node (1 10), one or more downlink control channels comprising an indication that the first UE (121 ) is assigned same or partly the same resources as at least one second UE (122), and an indication to the first UE

(121 ) to cancel interference from the at least one second UE (122),

- perform cancelling of interference related to the at least one second UE

(122) according to the indication.

35. The first UE (121 ) according to claim 34, wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) is adapted to comprise assisting information relating to any one or more out of: an identifier of the second UE (122), scheduling information of the second UE (122), and a transmission mode of the second UE (122), and wherein the cancelling of interference related to the at least one second UE (122) is adapted to be performed based on the assisting information.

36. The first UE (121 ) according to any of the claims 34-35, wherein the indication that the first UE (121 ) is assigned the same or partly the same resources as the at least one second UE (122) is adapted to be comprised in a first downlink control channel, and wherein the indication to the first UE (121 ) to cancel interference from the at least one second UE (122) is adapted to be comprised in a second downlink control channel.

37. The first UE (121 ) according to claim 34-36, the first UE (121 ) further being

configured to:

- decode the assisting information, the method further comprising

- when the cancelling of interference related to the at least one second UE (122) is performed, decode the traffic channel intended for the first UE (121 )

38. The first UE (121 ) according to claim 34-36, wherein the first UE (121 ) further is configured to:

cancel interference related to the at least one second UE (122) when decoding the traffic channel intended for the first UE (121 ) failures, and

decode the traffic channel intended for the first UE (121 ).

39. The first UE (121 ) according to claim 34, wherein the indication that the first UE

(121 ) is assigned the same or partly the same resources as the at least one second UE (122), is the indication to the first UE (121 ) to cancel interference from the at least one second UE (122).

40. The first UE (121 ) according to any of the claims 34-39, wherein the first UE (121 ) is configured to be Non Orthogonal Multiple Access, NOMA, capable, and wherein the first UE (121 ) being assigned the same or partly the same resources as at least one second UE (122) relates to NOMA.

41 . A computer program comprising instructions, which when executed by at least one processor (1450), cause the at least one processor (1450) to perform actions according to any of the claims 1 -13.

42. A carrier comprising the computer program of claim 41 , wherein the carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer- readable storage medium.

43. A computer program comprising instructions, which when executed by at least one processor (1540), cause the at least one processor (1540) to perform actions according to any of the claims 14-20.

44. A carrier comprising the computer program of claim 43, wherein the carrier is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer- readable storage medium.