DE102013022301B4 - Method and apparatus for providing multiple thresholds for detecting an interference scenario - Google Patents

Abstract

A method (800) for providing a plurality of thresholds for interference detection based on a composite signal (400) comprising a transmission from a serving cell (203) and multiple transmissions from a plurality of interfering cells (201), the method comprising: estimating (801) a signal-to-noise ratio (SNR) of the serving cell (203) at a receiver, estimating (802) for each of the plurality of interference cells (201) an interference-to-noise ratio (INRn, INRm) at the receiver and providing ( 803) of the plurality of threshold values based on the signal-to-noise ratio (SNR) of the serving cell (203), the interference-to-noise ratios (INRn, INRm) of the interfering cells (201) and information (Sk (s)), indicating an activity state of the plurality of interfering cells (201), the transmissions of the composite signal (400) including a first part (406) having a first power and a second portion (404) scaled with a second power scaling value (rhoB), and wherein the plurality of thresholds are provided based on the first power scaling values (rhoA) and the second power scaling values (rhoB) and the multiple thresholds are used to detect different interference scenarios.

Description

TERRITORY

The invention relates to methods and apparatus for providing multiple thresholds for the detection of interference scenarios based on a received composite signal comprising transmissions of a plurality of cells, in particular based on a mobile communication standard in synchronized mobile networks such as 3GPP Long Term ("3GPP Long Term Evolution "), received radio signal.

BACKGROUND

Modern mobile networks are facing the challenge that the demand for data traffic is increasing dramatically. Network operators need to modify their networks to increase overall capacity. One solution may be to arrange denser macrocells. However, this solution can be very costly and fast-moving users may need to make handovers very often. Another solution may be heterogeneous networks. A macrocell may be used to provide coverage over a larger area, and small cells (eg, pico or femto cells) may be placed in the coverage area to increase capacity at some "emergency spots." The establishment of small cells can be less expensive than those of new macrocells, it can increase the supply, and it can increase the overall data throughput of the network. However, it can also generate strong interference scenarios. Accordingly, it may be desirable to provide a method and apparatus for detecting the interference scenarios to take countermeasures.

US 2012/0 201 152 A1 describes a method for determining interference estimates based on pilot signals and on data carriers. The thresholds used are traffic-to-pilot ratios (TRP).

US 2013/0 017 794 A1 concerns interferences in a local radio network. Threshold values are CCA (clear channel assessment) thresholds.

WO 2013/064 897 A1 teaches a method in which a base station notifies a mobile station of identification of a major disruptor.

DE 10 2013 103 230 A1 shows a method for managing signal interference in a mobile network. A terminal may compare a power level and an offset of an interfering reference signal and a power level and an offset of a powering reference signal.

US 2013/0 303 153 A1 relates to a channel quality indicator in mobile networks. An interference coordination technique, also called ABS (almost blank subframe), uses ABS thresholds.

US 2013/0 114 441 A1 also concerns interference coordination. A calculation of the channel state information is intended to improve the interference detection.

US 2013/0 017 825 A1 shows a method for reducing the sent feedback information from a terminal to a mobile network.

BRIEF DESCRIPTION OF THE DRAWING

The attached drawings are intended to provide a further understanding of aspects, and are incorporated in and constitute a part of this specification. The drawing illustrates aspects and, together with the description of the explanation of principles of aspects. Other aspects and many of the intended advantages of aspects will be readily understood as they become better understood by reference to the following detailed description. Like reference numerals designate corresponding similar parts.

1 is a schematic diagram of a heterogeneous network 100 that is a macrocell 101 and picocells 103 . 105 according to an interference scenario.

2 FIG. 12 is a schematic diagram of a non-colliding scenario for a received RBSF (resource block in frequency direction by subframe in time direction). FIG. 206 in a communication system 200 that is a mobile device 207 which has a serving signal 204 a serving cell 203 receives. The serving signal 204 is caused by an interfering signal 202 an interfering cell 201 disturbed when there is a communication channel 205 is sent.

3 Figure 12 is a schematic diagram of a colliding scenario for a received RBSF 306 in the 2 represented communication system 200 , The serving signal 304 is caused by an interfering signal 302 disturbed when it is over the communication channel 205 is transmitted.

4 is a schematic three-dimensional time-frequency representation of an LTE radio frame 400 , the first resource elements 406 , which are scaled with a first scaling factor ρ _A (rhoA), second resource elements 404 scaled with a second scaling factor ρ _B (rhoB) and cell-specific reference signals (CRS) 408 having.

5 is a schematic time-frequency representation of a received composite signal that includes an RBSF 500 according to a one or two cell specific antenna port configuration.

6 is a schematic time-frequency representation of a received composite signal that includes an RBSF 600 according to a four cell specific antenna port configuration.

7 is a schematic diagram of a method 700 for interference scenario detection.

8th is a schematic diagram of a method 800 to provide thresholds for interference detection.

9 is a block diagram of an interference detection device 900 ,

10 is a performance diagram 1000 showing an interference scenario with two non-colliding aggressor cells, ie interfering cells.

11 is a performance diagram 1100 showing an interference scenario with a non-colliding and a colliding aggressor cell.

12 is a performance diagram 1200 showing an interference scenario with two non-colliding and one colliding aggressor cell.

13 is a performance diagram 1300 which provides a threshold selection for the in 12 shown interference scenario shows.

14 shows performance diagrams 1400 , which shows a threshold selection for a two aggressor scenario.

DETAILED DESCRIPTION

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific aspects in which the invention may be practiced. It should be understood that other aspects may be utilized and that structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is therefore not to be considered as limiting, and the scope of the present invention is defined by the appended claims.

CRS:

zellenspezifisches Referenzsignal,

RE:

Ressourcenelement,

IRC:

Interferenzunterdrückungskombination,

MMSE:

minimaler mittlerer quadratischer Fehler,

LTE:

Langzeitentwicklung (”Long Term Evolution”),

LTE-A:

fortentwickeltes LET (”LTE Advanced”), Ausgabe 10 und höhere Versionen von 3GPP LTE,

HF:

Hochfrequenz,

UE:

Benutzergerät,

INR:

Interferenz-Rausch-Verhältnis,

RBSF:

Ressourcenblockunterrahmen, d. h. ein Ressourcenblock in Frequenzrichtung mal Unterrahmen in Zeitrichtung.

The following terms, abbreviations and notations are used here:

CRS:

cell-specific reference signal,

RE:

Resource element

IRC:

Interference suppression combination,

MMSE:

minimal mean square error,

LTE:

Long-term development ("Long Term Evolution"),

LTE-A:

advanced LET ("LTE Advanced"), Issue 10 and later versions of 3GPP LTE,

HF:

High frequency,

UE:

User device,

INR:

Interference noise ratio,

RBSF:

Resource block subframe, ie one resource block in frequency direction by subframe in time direction.

The methods and apparatus described herein may be based on interference scenario detection, power scaling, and colliding and non-colliding aggressor cells. It should be noted that comments given in connection with a described method may also apply to a corresponding device which is designed to carry out the method, and vice versa. For example, if a specific method step is described, a corresponding device may include a unit for performing the described method step, even if such a unit is not explicitly described or illustrated in the figures. It is further to be understood that the features of the various exemplary aspects described herein may be combined with each other unless specifically stated otherwise.

The methods and apparatuses described herein may be implemented in wireless communication networks, particularly in communication networks based on mobile communication standards such as LTE and / or OFDM. The methods and apparatuses described below may further be implemented in a base station (NodeB, eNodeB) or a mobile device (or a mobile station or a user equipment (UE)). The described devices may include integrated circuits and / or passive elements and be manufactured according to various technologies. For example, the circuits may be configured as logic integrated circuits, analog integrated circuits, mixed signal integrated circuits, optical circuits, memory circuits and / or passive integrated elements.

The methods and apparatus described herein may be configured to transmit and / or receive radio signals. Radio signals may be or include radio frequency signals radiated by a radio transmitter (or radio transmitter) having a radio frequency ranging from about 3 Hz to 300 GHz. The frequency range may correspond to frequencies of AC electrical signals used for generating and detecting radio waves.

The methods and apparatus described below may be designed in accordance with mobile communication standards, such as the Long Term Evolution (LTE) standard. Launched as the 4G LTE, the LTE (Long Term Evolution) standard is a standard for wireless communication of high-speed data for mobile phones and data terminals. It is based on the GSM / EDGE and UMTS / HSPA network technologies, which increase the capacity and speed using a different radio interface along with core network enhancements. The standard is developed by the 3GPP (Third Generation Partnership Project) and is specified in its Issue 8 document series, with enhancements described in Issues 9, 10, and 11.

The methods and devices described below can be used in OFDM systems. The following describes orthogonal frequency division multiplexing (OFDM) systems. OFDM is a scheme for encoding digital data on multiple carrier frequencies. OFDM has been developed into a wireless or copper wire popular scheme for wideband digital communication used in digital television and audio broadcasting applications, DSL broadband Internet access, wireless networks and 4G mobile communications applications. OFDM is a frequency division multiplexed (FDM) scheme used as a digital multicarrier modulation method. A large number of closely spaced orthogonal subcarrier signals can be used to transfer data. The orthogonality can prevent crosstalk between subcarriers. The data may be divided into multiple parallel data streams or channels, with one provided for each subcarrier. Each subcarrier can be modulated with a conventional modulation scheme (such as quadrature amplitude modulation or phase shift keying) at a low symbol rate, keeping overall data rates similar to those of conventional single carrier modulation schemes in the same bandwidth. OFDM may be substantially identical to a coded OFDM (COFDM) and a discrete multi-tone modulation (DMT).

The methods and devices described below can be used in multilayer heterogeneous networks. In the following, multilayer heterogeneous networks, macrocells, picocells, femtocells, target cells and interfering cells are described. Multilayer heterogeneous networks (HetNet) can be used in LTE and LTE advanced standards to build the network from not just a single eNodeB (homogeneous network) type, but to set up eNodeB with different capabilities, most importantly different transmission power classes. These eNodeBs can be broadly referred to as macro eNodeB (MeNB) or macrocells, pico-eNodeB (PeNB) or picocells, and femto / home eNodeB (HeNB) or femto cells, and for basic outdoor, outdoor hot zone, and indoor environments, respectively / Company supplies. Alternatively, the term "small cells" could be used as a broader term covering pico and femtocells.

Macrocells can cover a wide range of cells (the typical cell radius being on the order of 500 meters to one kilometer) with transmit antennas over interfering objects and a transmit power on the order of 46 dBm (20 watts). You can deploy a service to all users. Femtocells, also referred to as home eNodeB (HeNB), may be lower powered cells installed by an end user (typically indoor). Pico cells may be operator-set cells with lower transmit powers, typically an order of magnitude smaller than those of macrocell eNodeB. They can typically be installed in wireless hotspot areas (such as shopping malls) and provide access to all users. In a scenario where a UE connects to pico cells, the pico cell may represent the target cell, while the macro cell may be the interfering cell providing a strong interference.

The methods and devices described below can be used in eICIC systems. In the following, improved intercell interference coordination (eICIC) and almost empty subframes (ABS) are described. The improved inter-cell interference coordination is used in the output 10 of 3GPP to prevent heavy inter-cell interference on both the downlink data and control channels. eICIC may be based on carrier aggregation with over-carrier scheduling or based on Time Domain Multiplexing (TDM) using so-called Near Empty Subframes (ABS).

The eICIC based on carrier aggregation may allow an LTE-A-UE to connect to multiple carriers simultaneously. Not only can it enable resource allocation across carriers, but it can also enable scheduler-based fast switching between carriers without a time-consuming handover. A simple principle in a HetNet scenario may be to divide the available spectrum, for example, into two separate component carriers, and to assign the primary component carriers (PCCs) to different network layers. The primary component carrier may be the cell providing the UE with the control information. Each network layer may additionally schedule UEs on other CCs called secondary component carriers (SCCs).

EICIC based on time domain multiplexing may periodically mute transmissions from eNodeB, thereby degrading others over entire subframes by severe interference, so that the victim eNodesB may have a chance to service their UEs due to severe interference from the aggressor eNodeB into them Subframe suffer. This mute is not necessarily complete because certain signals, such as common reference symbols (unless configured as MBSFN subframes), primary and secondary synchronization signals (PSS and SSS), physical broadcast channel (PECH), SIB-1, and paging may possibly be pending with their associated PDCCH even in otherwise muted subframes, for example to avoid radio link failure, or for backward compatibility. Collisions of a subframe mute with PSS, SSS, SIB-1 and paging should be minimized. Therefore, muting in subframes # 0, # 1, # 5, and # 9 should be avoided as much as possible. So muted subframes can be referred to as almost empty subframes (ABS).

The methods and apparatus described below may be used in interference-aware receivers, such as IRC (Interference Rejection Combining) receivers. IRC is a technique that can be used in an antenna diversity system to suppress co-channel interference by using cross-covariance between the noise in diversity channels. The interference cancellation combination (IRC) can be used as an effective alternative for increasing uplink bit rates in areas where cells overlap. The interference cancellation combination (IRC) receiver can be effective in improving cell edge user throughput because it can suppress inter-cell interference. The IRC The receiver may typically be based on a minimum mean square error (MMSE) criterion that may require channel estimation and covariance matrix estimation including intercell interference with high accuracy.

The methods and devices described below can be used in MIMO systems. Multiple Input, Multiple Output (MIMO) wireless communication systems use multiple antennas at the transmitter and receiver to increase system capacity and achieve better quality of service. In spatial multiplexing mode, MIMO systems can achieve higher peak data rates without increasing the bandwidth of the system by transmitting multiple data streams in parallel in the same frequency band. A MIMO detector can be used to detect the MIMO channel, which is described by the channel matrices between respective antennas of the transmitter and respective antennas of the receiver.

This disclosure presents an algorithm for interference scenario detection in synchronized mobile networks such as LTE networks. LTE networks may use a frequency reuse factor of one, where neighboring cells may use the same frequency band as the serving cells, and a mobile device at the cell edge may be subject to strong interference from multiple cells. In particular, heterogeneous network devices can increase this problem because a plurality of picocells can be arranged in the coverage area of a macrocell. Multiple interference mitigation algorithms for synchronized networks may require knowledge of the design of these interfering cells. Depending on the recognition algorithms can be modified or parameters can be set. The following presents an algorithm that can detect if an aggressor cell sends a resource block or does not send a resource block and can detect scenarios with multiple active aggressor cells.

1 is a schematic diagram of a heterogeneous network 100 that is a macrocell 101 and picocells 103 . 105 having. The picobase stations 103 . 105 can through one opposite that of the macro base station 101 essentially lower transmission power to be characterized. Due to the large disparity between the transmit power levels between two types of base stations, the coverage area is 112 . 114 the picobase station 103 . 105 considerably more limited than the supply area 110 the in 1 represented macro base station 101 , The larger coverage area 110 the macrocells 101 can more users 107 . 109 to a high performance macro eNodeB, even though there may not be enough resources to service all user terminals effectively. At the same time, the resources of the lower power base station may remain underused. The UE 107 . 109 may include interference scenario detection, as described below.

2 FIG. 12 is a schematic diagram of a non-colliding scenario for a received RBSF (resource block in frequency direction by subframe in time direction). FIG. 206 in a communication system 200 that is a mobile device 207 which has a serving signal 204 a serving cell 203 receives. The serving signal 204 is caused by an interfering signal 202 an interfering cell 201 disturbed when there is a communication channel 205 is sent. An RBSF may be defined as a block having a length of a resource block (for example, 180 kHz) in the frequency direction and a length of a subframe (for example, 1 ms) in the time direction.

The serving signal 204 the serving cell 203 can be represented as a two-dimensional signal pattern in the time-frequency domain, for example according to an LTE frame structure. The signal pattern may be structured as a two-dimensional grid carrying a plurality of resource elements, which may be referred to as small squares forming the grid. The resource elements may be divided into a control area comprising control resource elements C in the left portion of the grid and a data area comprising data resource elements D in the right portion of the grid. Reference resource elements R0, R3, which are referred to as cell-specific reference signals in LTE, can be distributed over the grid in a regular manner.

Similarly, the interfering signal 202 the interfering cell 201 may also be represented as a two-dimensional signal pattern in the time-frequency domain, for example according to an LTE frame structure structured as a two-dimensional grid carrying a plurality of resource elements forming the grid. The reference resource elements I0, I3, referred to as cell-specific reference signals in LTE, may be similar to the serving signal 204 arranged in a regular pattern over the grid. This regular pattern may be a predetermined pattern that is used to identify the interfering cell 201 is used. However, that can be regular Pattern of the interfering signal 202 from the regular pattern of the serving signal 204 be different, like out 2 is apparent. When the cell-specific reference signals of both the hereinafter referred to as R0 and R3 serving signal 204 as well as the interfering signal referred to below as I0 and I3 202 do not collide, the interference scenario is called "non-conflicting". When the cell-specific reference signals R0, R3 and I0, I3 of both the serving signal 204 as well as the interfering signal 202 match, the interference scenario is called "conflicting". The non-colliding interference scenario is in 2 while the colliding interference scenario in 3 is shown.

Both the serving signal 204 the serving cell 203 as well as the interfering signal 202 the interfering cell 201 can via a communication channel 205 be transmitted. In the communication channel 205 can both signals 204 . 202 are superimposed to thereby a common signal as a received signal 206 to be formed by the mobile device 207 can be received.

That from the mobile device 207 Received signal received 206 can also be represented as a two-dimensional signal pattern in the time-frequency domain, for example according to an LTE frame structure, which is structured as a two-dimensional grid carrying a plurality of resource elements forming the grid. A mobile device 207 having an interference scenario detection, as described below, may be able to detect such non-colliding scenarios.

3 Figure 12 is a schematic diagram of a colliding scenario for a received RBSF 306 in the 2 represented communication system 200 , The serving signal 304 is caused by an interfering signal 302 disturbed when it is over the communication channel 205 is transmitted.

The serving signal 304 the serving cell 203 can be represented as a two-dimensional signal pattern in the time-frequency domain, as described above with reference to FIG 2 has been described. Reference resource elements R0, R3, referred to as cell-specific reference signals in LTE, may be arranged in a regular pattern across the grid.

Similarly, also the interfering signal 302 the interfering cell 201 are represented as a two-dimensional signal pattern in the time-frequency domain as described above with reference to FIG 2 has been described. Reference resource elements I0, I3, referred to as cell-specific reference signals in LTE, may be arranged in a regular pattern across the grid. 3 shows the colliding scenario in which the cell-specific reference signals I0, I3 of the interfering signal 302 with the cell-specific reference signals R0, R3 of the serving signal 304 collide. In the received RBSF 306 the cell specific reference signals R0, R3 and I0, I3 collide from the serving cell 203 and the interfering cell 201 in individual resource elements hereinafter referred to as RI0 and RI3. A mobile device 207 having an interference scenario detection, as described below, may be able to detect such colliding scenarios.

4 is a schematic three-dimensional time-frequency representation of an LTE radio frame 400 , the first resource elements 406 , which are scaled with a first scaling factor ρ _A , second resource elements 404 scaled by a second scaling factor ρ _B and cell-specific reference signals 408 having.

The LTE radio frame 400 is a three-dimensional representation of the RBSF 206 , as in 2 is shown, and the RBSF 306 , as in 3 is shown. The LTE radio frame 400 can be a tax area 402 in the left part and a data area in the right part. A first part 406 The resource elements may be scaled with a first scaling factor ρ _A , and a second part 404 The resource elements can be scaled with a second scaling factor ρ _B. Cell-specific reference signals 408 can in a regular pattern over the RBSF 400 be arranged. The cell-specific reference signal 408 can be scaled with a scale other than the first scaling factor ρ and the second scaling factor ρ _B.

5 is a schematic time-frequency representation of a received composite signal that includes an RBSF 500 according to a one or two cell specific antenna port configuration. The RBSF 500 can the above with reference to 4 described RBSF 400 correspond. The reference signal R0 may represent the first antenna port, and the reference signal R1 may represent the second antenna port. The PDCCH control area can have 2 resource elements in it Extend time range. A first part of the resource elements may be scaled with a first scaling factor ρ _A , and a second part of the resource elements may be scaled with a second scaling factor ρ _B.

6 is a schematic time-frequency representation of a received composite signal that includes an RBSF 600 according to a four cell specific antenna port configuration. The RBSF 600 can the RBSF 500 similar to above with reference to 5 has been described. Unlike with respect to 5 1- or 2-antenna port configuration described in FIG 6 illustrated 3 or 4 antenna port configuration four cell-specific reference signals R0, R1, R2, R3. The control area PDCCH can extend over 3 resource elements in the time domain. The reference signal R0 may represent the first antenna port, the reference signal R1 may represent the second antenna port, the reference signal R2 may represent the third antenna port, and the reference signal R3 may represent the fourth antenna port. A first part of the resource elements may be scaled with a first scaling factor ρ _A , and a second part of the resource elements may be scaled with a second scaling factor ρ _B.

The RBSF 600 can be configured according to the parameter set shown in Table 1. parameter 3GPP standard comment One-CRS antenna port Two / Four-CRS antenna ports Reference signal power 36331 / 6.3.2 Emitted reference signal power per resource element (EPRE) -60 ... 50 dBm P _A 36.331 / 6.3.2 (PDSCH config) UE-specific parameter -6 dB, -4.77 dB, -3 dB, -1.77 dB, 0 dB, 1 dB, 2 dB, 3 dB P _B 36.331 / 6.3.2 (PDSCH config) Cell-specific parameter 0, 1, 2, 3 δ _{power offset} 36.213 / 5.2 δ _{power offset} = 0 for all PDSCH transmission schemes except multi-user MIMO ρ _A 36.213 / 5.2 Derived parameter ρ _A = δ _{power offset} + P _A + 10 log ₁₀ (2) (transmit diversity with 4 cell-specific antenna ports) or ρ _A = δ _{power offset} ρ _B / ρ _A 36.213 / 5.2 Derived parameter (Table 5.2.1 in 36.213) Table 1: Example parameter configuration of a received RBSF 600 according to the 3GPP standards TS 36.331 V11.5.0 (2013-09) and TS 36.213 V11.4.0 (2013-09)

7 is a schematic diagram showing a procedure 700 for interference scenario detection shows. The procedure 700 can have the following steps: Receive 701 a composite signal comprising a transmission from a serving cell and transmissions from at least one interfering cell, each transmission comprising a first part scaled according to a first power scale ρ _A , a second part scaled according to a second power scale ρ _B , and a third part sent with a fixed power value. The procedure 700 can be determining 702 a first power value P _{noise, RB} based on the third part of the transmission from the serving cell. The procedure 700 can be determining 703 a second power _value P _{rhoA, RB} based on the first parts of the transmissions. The procedure 700 can the recognition 704 an interference _scenario based on the first power value P _{noise, RB} and the second power _value P _{rhoA, RB} .

In one example, determining the first power value P may include _{noise, RB} suppressing a portion due to transmission from the serving cell in the received composite signal. In one example, suppressing a portion due to transmission from the serving cell in the received composite signal may determine the portion due to transmission from the serving cell by a channel estimate Ĥ ₀ and a reference signal s ₀ ^CRS from the have serving cell. In one example, determining the second power _value P _{rhoA, RB may include} suppressing a portion due to transmission from the serving cell in the second power _value P _{rhoA, RB} . In one example, suppressing a portion due to transmission from the serving cell in the second power _value P _{rhoA, RB may} determine the portion due to transmission from the serving cell based on an average channel estimate | Ĥ ₀ | ² , which is weighted with the first power scale rhoA. In one example, each transmission may comprise a plurality of resource elements arranged on a two-dimensional time-frequency grid. In one example, a predetermined number of resource elements in frequency and a predetermined number of resource elements in time may form a resource block. In one example, the first power _value P _{noise, RB} and the second power _value P _{rhoA, RB may be determined} on a resource _block basis. In one example, the resource block may include a control area and a data area. In one example, the first parts, the second parts and the third parts of the transmissions may be based on resource elements of the data region.

In one example, each of the first parts and the second parts of the transmissions may comprise rows of resource elements located in the resource block with respect to the frequency. In one example, the third portions of the transmissions may include resource elements having cell-specific reference symbols arranged at predetermined frequency-time positions in a resource block. In one example, the resource elements may include cell-specific reference symbols that are transmitted with a known reference power value. In one example, the transmissions from at least one interfering cell may include colliding interfering cell transmissions, wherein cell-specific reference symbols collide with cell-specific reference symbols of the serving cell, and / or transmissions of non-colliding interfering cells, wherein cell-specific reference symbols do not collide with cell-specific reference symbols of the serving cell, exhibit. In an example, determining the first power value P _{noise, RB} comprises averaging the power of the received composite signal over resource elements of a resource block, the resource elements comprising cell-specific reference symbols. In one example, determining the second power _value P _{rhoA, RB may comprise averaging} the power of the received composite signal over resource elements of a resource block, wherein the resource elements are scaled according to the first power scale rhoA. In one example, the detection of the interference _scenario may be based on two-dimensional thresholds with respect to the first power value (P _{noise, RB} ) and the second power _value P _{rhoA, RB} .

Hereinafter, an algorithm will be exemplified as an implementation of the method 700 described. The algorithm may be on a mobile terminal in the manner of a user device 107 . 109 as above with reference to 1 described on a mobile device or user device 207 as above with reference to 2 has been described. The algorithm can be used for interference scenario detection in synchronized mobile networks such as LTE networks. The interference scenario detection algorithm may calculate power estimates on different sets of resource elements and compare the values with different detection thresholds in a two-dimensional plane. The detection thresholds may be determined by calculating expected power estimates, determining the closest adjacent expected power estimates for each value, calculating the averaged expected power estimates, and plotting straight lines through these points.

kann als der Satz von Ressourcenelementen bezeichnet werden, die auf allen Zellen mit ρ_A skaliert sind. Für einen normalen zyklischen Präfix können alle Ressourcenelemente (RE) von Symbolen mit Index 3, 5, 6, 9, 10, 12, 13 jedes Unterrahmens verwendet werden. Diese sind Unterrahmenindizes für Ressourcenelemente, die mit ρ_A in beiden Antennenkonfigurations-RBSF-Signalen 500, 600 skaliert sind, wie in den 5 und 6 dargestellt ist.

can be referred to as the set of resource elements that are scaled on all cells with ρ _A. For a normal cyclic prefix, all resource elements (RE) of symbols with index 3, 5, 6, 9, 10, 12, 13 of each subframe can be used. These are sub-frame indices for resource elements that are ρ _A in both antenna configuration RBSF signals 500 . 600 are scaled, as in the 5 and 6 is shown.

kann das empfangene Signal als

gegeben sein, wobei H_k den Kanal bezeichnet, W_tx,k die Vorcodiermatrix bezeichnet, ρ_A,k den Leistungsskalierungswert rhoA bezeichnet, s_k das gesendete Signal bezeichnet und k = 0 die bedienende Zelle bezeichnet, die Indizes m kollidierende Aggressoren bezeichnen und die Indizes n nicht kollidierende Aggressoren bezeichnen. Das additive weiße Gaußsche Rauschen wird als n bezeichnet. I_{nicht koll} und I_koll sind Sätze nicht kollidierender Aggressoren bzw. kollidierender Aggressoren. ^{CRS are} referred to as the resource elements of the Cell Specific Reference Signal (CRS) positions of the serving cell. The signal model can assume a combination of colliding and non-colliding aggressors. For the sentence

can receive the received signal as

where H _k denotes the channel, W _{tx, k} denotes the precoding matrix, ρ _{A, k} denotes the power scaling value rhoA, s _k denotes the transmitted signal and k = 0 designates the serving cell, the indices designate m colliding aggressors and the Indices denote n non-colliding aggressors. The additive white Gaussian noise is called n. I _noll and I _koll are sets of non-colliding aggressors or colliding aggressors.

und

kann das empfangene Signal an der bedienenden Zelle CRS RE nach der Subtraktion des remodulierten Signals der bedienenden Zelle bezeichnen,

wobei Ĥ_k die Kanalschätzung von H_k bezeichnet.The signal model for the set of serving cell CRS RE can be given as

and

may designate the received signal at the serving cell CRS RE after the subtraction of the remodulated signal of the serving cell,

where H _k is the channel estimate of H _k.

und zweitens kann die empfangene Signalleistung pro Ressourcenblock auf den mit ρ_A skalierten Ressourcenelementen nach

geschätzt werden, wobei H ₀ die gemittelte Kanalschätzung über einen Ressourcenblock ist und

die Anzahl der Elemente des Satzes

bzw. t^CRS,RB bezeichnen. Falls mehr als eine Empfangsantenne vorhanden ist, kann der Durchschnitt der empfangenen Leistungswerte aller Empfangsantennen genommen werden.The basis for a power detector can be two power estimates: First, the noise and interference power at the serving cell's CRS positions per resource block can be estimated as follows:

and secondly, the received signal power per resource block may fall upon the resource elements scaled by ρ _A

be appreciated, where H ₀ the averaged channel estimate is over a resource block and

the number of elements of the sentence

or t ^{CRS, RB} denote. If more than one receive antenna is present, the average of the received power values of all receive antennas can be taken.

In an example, the determining 702 of the first power value P _{noise, RB of} the method 700 can be achieved by equation (4). In an example, the determining 703 of the second power _value P _{rhoA, RB of} the method 700 can be achieved by equation (5). The recognition 704 an interference scenario of the procedure 700 can be achieved by comparing the first power value P _{noise, RB} according to equation (4) with the second power _value P _{rhoA, RB} according to equation (5).

8th is a schematic diagram of a method 800 for providing a plurality of interference detection thresholds based on a composite signal comprising a transmission from a serving cell and transmissions from multiple interfering cells. The procedure 800 can appreciate that 801 a signal-to-noise ratio (SNR) of the serving cell at a receiver. The procedure 800 can appreciate that 802 of an interference-to-noise ratio INR _n , INR _m at the receiver for each of the plurality of interference cells. The procedure 800 can be providing 803 of the plurality of thresholds based on the signal-to-noise ratio SNR of the serving cell, the interference-to-noise ratios INR _n , INR _{m of} the interfering cells, and information S _k (s) indicating an activity state of the plurality of interfering cells.

In one example, the transmissions from the plurality of interfering cells may include transmissions from interference cells that collide with a reference cell of the serving cell, and transmissions from interference cells that do not collide with the reference cell of the serving cell. In one example, the composite signal transmissions may include a first part scaled with a first power scaling value rhoA and a second part scaled with a second power scaling value rhoB. The plurality of thresholds may be provided based on the first power scaling values rhoA and the second power scaling values rhoB. In one example, the method may 800 providing a first power value P 'of _{noise, RB,} based on adding expected received powers due to the first part of the composite signal in accordance with the information S _k (s) indicating an activity state of the plurality of interfering cells. In one example, the method may 800 providing a second power _value P ' _{rhoA, RB} based on adding expected received _powers due to the second part of the composite signal in accordance with the information S _k (s) indicating an activity state of the plurality of interfering cells. In one example, the method may 800 providing the plurality of threshold _values based on the first power value P ' _{noise, RB} and the second power _value P' _{rhoA, RB} .

Hereinafter, an algorithm will be exemplified as an implementation of the method 800 described. The algorithm may be used for thresholding related to interference scenario detection in synchronized mobile networks such as LTE networks. The algorithm may be on a mobile terminal in the manner of a user device 107 . 109 as above with reference to 1 described on a mobile device or user device 207 as above with reference to 2 has been described.

The above with reference to 7 The detector described may compare the estimates to thresholds that may be arbitrary in a two-dimensional plane. The thresholds may be calculated by determining the expected receive power for each scenario combination. For each expected power value, the nearest adjacent expected power values can be determined and the average of these two values calculated. Straight lines can be laid by the average power values. A calculation of the expected receive power may be based on the following inputs. For the serving cell on the rhoA parameter, the number of CRS antenna ports and the SNR estimate, and for the interfering cells on the number of interfering cells, the number of CRS antenna ports, the Interference Ratio (INR) and the Values for rhoA and rhoB for non-colliding aggressors. Most values may be slowly varying, such as the SNR, the number of interfering cells, the INR, and the active antenna ports, and may be obtained from various sources, such as higher layer signaling, cell search module, and / or estimates previous subframe. Alternatively, by analyzing received power _values P _{rhoA, RB} and P, thresholds may include _{noise, RB} from previous subframes, clustering them into groups, and establishing thresholds between the clusters, for example, by taking the average of each cluster and calculating the threshold by taking the mean between two averages be determined.

The expected receive power for a scenario s can be calculated as

N _{tx, k} may denote the number of transmit CRS antenna ports of cell k. SIR (signal-to-interference ratio) and SNR may be given as linear values, where

Szenarien geben, und die Werte von S_k für alle Aggressoren können entsprechend der binären Darstellung der Anzahl s festgelegt werden.It can be total

Scenarios, and the values of S _k for all aggressors can be set according to the binary representation of the number s.

-Berechnung vereinfacht werden und kann die Signalenergie der bedienenden Zelle nicht subtrahiert werden müssen.The rhoA value of the serving cell and the rhoA / rhoB values of the interfering cells may be unknown. In this case, median values of the allowed parameter range can be used. The detector can operate at either the RB level or a full sub-frame level to detect ABS subframes of certain aggressor cells. For operation on a full subframe, the power values can be averaged across all resource blocks (RB). The detector can also be applied to unplanned RB of the serving cell. Then the

Calculation can be simplified and the signal energy of the serving cell need not be subtracted.

9 is a block diagram of an interference detection device 900 , The device 900 can be a first unit 901 which is adapted to receive a composite signal comprising transmissions from a serving cell and a plurality of (at least one) interfering cells, each transmission comprising a first part scaled according to a first power scale (rhoA), a second part which is scaled according to a second power scale (rhoB) and a third part sent with a fixed power value. The device 900 can be a second unit 902 which is adapted to determine a first power value P _{noise, RB,} based on the third part of the transmission from the serving cell. The device 900 can be a third unit 903 which is _adapted to determine a second power _value P _{rhoA, RB} on the basis of the first parts of the transmissions. The device 900 can be a fourth unit 904 which is _adapted to detect an interference _scenario based on the first power _value P _{noise, RB} and the second power _value P _{rhoA, RB} . The first unit 901 can the block 701 implement how with reference to above 7 described, the second unit 902 can the block 703 implement as described above with respect to 7 described, the third unit 903 can the block 702 implement as described above with respect to 7 described, and the fourth unit 904 can the block 704 implement as described above with respect to 7 has been described. The interference detection device 900 can be an optional fifth unit 905 , which is designed to estimate a signal-to-noise ratio (SNR) of the received composite signal, an optional sixth unit 906 which is designed to estimate an interference-to-noise ratio (INR) of the received composite signal, and an optional seventh unit 907 , which is designed to provide thresholds based on the estimated SNR and INR. The fifth unit 905 can the block 801 implement as described above with respect to 8th described, the sixth unit 906 can the block 802 implement as described above with respect to 8th described, and the seventh unit 907 can the block 803 implement as described above with respect to 8th has been described. Alternatively, thresholds that have been processed using offline measurements may be the fourth unit 904 to be provided.

In one example, the second unit 902 determine the first power value P _{noise, RB,} based on the composite signal power estimated over the third portion of the transmission from the serving cell, the third portion comprising cell-specific reference signals. In one example, the third unit 903 determine the second power _value P _{rhoA, RB} based on the composite signal power estimated via resource _{elements of} the composite signal, wherein the resource elements may be scaled according to the first power scale. In one example, the fourth unit 904 recognize the interference scenario based on a two-dimensional threshold with respect to the first power value P _{noise, RB} and the second power _value P _{rhoA, RB} . In one example, the second unit 902 and the third unit 903 determine their respective power _values P _{noise, RB} , P _{rhoA, RB} over a resource _{block of} the composite signal. In one example, the second unit 902 and the third unit 903 determine their respective power _values P _{noise, RB} , P _{rhoA, RB} via a subframe of the composite signal.

The interference detection device 900 may include an interference scenario detection algorithm, as described above with respect to FIG 7 in particular according to equations (4) and (5).

10 is a performance diagram 1000 , which shows an interference scenario with two active non-colliding aggressor cells. Both aggressors use 2 CRS antenna ports and the SNR is fixed at 14 dB. A non-colliding aggressor has an INR of 10 dB, and the second has an INR of 7 dB.

The circles indicate observed events, and the dashed lines indicate the detection thresholds. It may be a first event 1001 for which both aggressor resource blocks are deleted [0 0]. A second event 1002 can be detected, for which the first aggressor transmits a resource block and the second aggressor resource block is deleted [1 0]. A third event 1003 can be recognized, for which the first aggressor resource block is deleted and the second aggressor transmits a resource block [0 1]. A fourth event 1004 can be detected for which both aggressors transmit resource blocks [1 1].

11 is a performance diagram 1100 showing an interference scenario with a non-colliding and a colliding aggressor cell. Both aggressors use 2 CRS antenna ports and the SNR is fixed at 14 dB. A non-colliding aggressor has an INR of 10 dB, and a colliding aggressor has an INR of 7 dB.

The circles indicate observed events, and the dashed lines indicate the detection thresholds. It may be a first event 1101 for which both aggressor resource blocks are deleted [0 0]. A second event 1103 can be detected, for which the first aggressor transmits a resource block and the second aggressor resource block is deleted [1 0]. A third event 1102 can be recognized, for which the first aggressor resource block is deleted and the second aggressor transmits a resource block [0 1]. A fourth event 1104 can be detected for which both aggressors transmit resource blocks [1 1].

12 is a performance diagram 1200 showing an interference scenario with two non-colliding and one colliding aggressor cell. The circles indicate observed events, and the dashed lines indicate the detection thresholds. A first event 1201 can be detected, for which all three aggressor resource blocks are deleted [0 0 0]. A second event 1202 can be recognized for that the first and third aggressor resource blocks are cleared and the second aggressor resource block is transmitted [0 1 0]. A third event 1203 can be detected for which the first and second aggressor resource blocks are cleared and the third aggressor resource block is transmitted [0 0 1]. A fourth event 1204 can be detected for which the second and third aggressor resource blocks are cleared and the first aggressor resource block is transmitted [1 0 0]. A fifth event 1205 can be recognized, for which the second and the third aggressor resource block are transmitted and the first aggressor resource block is deleted [0 1 1]. A sixth event 1206 can be detected, for which the first and the second aggressor resource block are transmitted and the third aggressor resource block is cleared [1 1 0]. A seventh event 1207 can be detected, for which the first and the third aggressor resource block are transmitted and the second aggressor resource block is deleted [1 0 1]. An eighth event 1208 can be detected, for which all three aggressor resource blocks are transmitted [1 1 1].

The detection performance may depend on the number of interferers and the relationship between the power levels of all the signals involved. Certain decisions can be obtained with a high probability of detection, while other decisions may have more margin for error.

13 is a performance diagram 1300 which provides a threshold selection for the in 9 shown interference scenario shows. The figure shows the influence of different power scaling values PA on the detection thresholds. Here, for example, the PA value of the colliding aggressor is varied between -6 dB and 3 dB.

The thresholds can be used to detect different interference scenarios. In a first scenario [0 0 0] all three aggressor resource blocks are deleted. In a second scenario [0 1 0], the first and third aggressor resource blocks are cleared and the second aggressor resource block is transmitted. In a third scenario [0 0 1], the first and second aggressor resource blocks are cleared and the third aggressor resource block is transmitted. In a fourth scenario [1 0 0], the second and third aggressor resource blocks are cleared and the first aggressor resource block is transmitted. In a fifth scenario [011], the second and third aggressor resource blocks are transmitted and the first aggressor resource block is cleared. In a sixth scenario [1 1 0], the first and second aggressor resource blocks are transmitted and the third aggressor resource block is cleared. In a seventh scenario [1 0 1], the first and third aggressor resource blocks are transmitted and the second aggressor resource block is cleared. In an eighth scenario [1 1 1], all three aggressor resource blocks are transmitted.

14 shows performance diagrams 1400 showing a threshold selection for a two aggressor scenario. The figure shows the dependence of the expected received power values and the resulting detection thresholds on aggressor strength in a two aggressor scenario. The aggressor INRs are varied between 10 dB and 3 dB.

The thresholds can be used to detect different interference scenarios. In a first scenario [0 0] both aggressor resource blocks are deleted. In a second scenario [0 1], the first aggressor resource block is cleared and the second aggressor resource block is transmitted. In a third scenario [10], the first aggressor resource block is transmitted and the second aggressor resource block is deleted. In a fourth scenario [1 1], both aggressor resource blocks are transmitted.

The methods and apparatus described in this disclosure can be used in the LTE physical layer along with interference mitigation techniques, such as CRS suppression and whitening techniques. The information provided may be used by subsequent algorithms to improve the operation of the receiver, i. H. to achieve increased data throughput, optimized feedback, improved measurement accuracy, and so on.

EXAMPLES

The following examples relate to further embodiments.

Example 1 is a method for detecting an interference scenario, the method comprising the steps of: receiving a composite signal comprising a plurality of transmissions from a serving cell and at least one interfering cell, each of the plurality Transmissions include a first portion scaled according to a first performance scale, a second portion scaled according to a second performance scale, and a third portion transmitted at a fixed power value, determining a first performance value based on the third portion transmission from the serving cell, determining a second power value based on the first part of the plurality of transmissions, and detecting an interference scenario based on the first power value and the second power value.

In Example 2, the subject matter of Example 1 may optionally include determining the first power value comprising: suppressing a portion due to transmission from the serving cell in the received composite signal.

In Example 3, the subject matter of Example 2 may optionally include suppressing a portion due to transmission from the serving cell in the received composite signal further comprising: determining the portion due to transmission from the serving cell by a channel estimate and a reference signal from the serving cell.

In Example 4, the subject matter of any one of Examples 1-3 may optionally include determining the second power value comprising: suppressing a portion due to transmission from the serving cell ( 203 ) in the second power value.

In Example 5, the subject matter of Example 4 may optionally include suppressing a portion due to transmission from the serving cell in the second power value, comprising: determining the portion due to transmission from the serving cell based on an average channel estimate associated with the first performance scale is weighted.

In example 6, the subject matter of any one of examples 1-5 may optionally include that each of the multiple transmissions comprises a plurality of resource elements arranged on a two-dimensional time-frequency grid and that a predetermined number of the resource elements in frequency and a predetermined one Number of resource elements in time to form a resource block.

In Example 7, the subject matter of Example 6 may optionally include determining the first power value and the second power value on a resource block basis.

In Example 8, the subject matter of any one of Examples 6-7 may optionally include the resource block comprising a control area and a data area, and a plurality of the first parts, a plurality of the second parts, and a plurality of the third parts of the multiple transmissions based on resource elements of the data area.

In example 9, the subject matter of any of examples 6-8 may optionally include each of the plurality of first portions and the plurality of second portions of the transmissions including rows of resource elements located in the resource block with respect to the frequency.

In example 10, the subject matter of any one of examples 6-9 may optionally include the plurality of third portions of the transmissions having resource elements comprising cell-specific reference symbols arranged at a plurality of predetermined frequency-time positions in a resource block.

In Example 11, the subject matter of Example 10 may optionally include the fixed power value of the third portions of the multiple transmissions being a known reference power value.

In Example 12, the subject matter of Example 11 may optionally include the plurality of transmissions from at least one interfering cell comprising: a first number of colliding interfering cell transmissions, wherein cell-specific reference symbols collide with cell-specific reference symbols of the serving cell, or a second number of Transmissions of non-colliding interfering cells, wherein cell-specific reference symbols do not collide with cell-specific reference symbols of the serving cell, or a combination of the first and second number of transmissions.

In example 13, the subject matter of any one of examples 1-12 may optionally include the determining of the first power value comprising: averaging the power of the received composite signal over the plurality of third portions of the transmissions.

In Example 14, the subject matter of any of Examples 1-13 may optionally include determining the second power value comprising: averaging the power of the received composite signal over resource elements of a resource block, wherein the resource elements are scaled according to the first power scale.

In Example 15, the subject matter of any of Examples 1-14 may optionally include detecting the interference scenario on two-dimensional thresholds with respect to the first power value and the second power value.

Example 16 is a method of providing multiple thresholds for interference detection based on a composite signal comprising a transmission from one serving cell and multiple transmissions from a plurality of interfering cells, the method comprising the steps of: estimating a signal-to-noise ratio of serving a cell at a receiver, estimating for each of the plurality of interference cells an interference-to-noise ratio at the receiver, and providing the plurality of thresholds based on the signal-to-noise ratio of the serving cell, the interfering-cell interference-to-noise ratios, and information; which indicate an activity state of the plurality of interfering cells.

In Example 17, the subject matter of Example 16 may optionally include the transmissions from the plurality of interfering cells transferring from multiple interference cells that collide with a reference cell of the serving cell and multiple transmissions from multiple interference cells that do not collide with the reference cell of the serving cell , include.

In example 18, the subject matter of any one of examples 16-17 may optionally include the composite signal transmissions having a first portion scaled to a first power scaling value and a second portion scaled by a second power scaling value, and the a plurality of thresholds based on the first power scaling values and the second power scaling values.

In Example 19, the subject matter of Example 18 may optionally include providing a first power value based on adding expected received powers due to the first part of the composite signal according to the one state of activity of the plurality of interfering cells indicating information and providing a second power value on the one Based on adding expected received powers due to the second part of the composite signal in accordance with the information indicating an activity state of the plurality of interfering cells and providing the plurality of thresholds based on the first power value and the second power value.

Example 20 is an interference detection device, comprising: a first unit configured to receive a composite signal comprising a plurality of transmissions from a serving cell and at least one interfering cell, each transmission having a first portion corresponding to a first one Power scale is scaled, a second part, which is scaled according to a second power scale, and a third part, which is sent with a fixed power value comprises, a second unit, which is designed to a first power value based on the third part of Determining transmission from the serving cell, a third unit configured to determine a second power value based on the plurality of first portions of the plurality of transmissions, and a fourth unit configured to determine an interference scenario based on the first Power value and the zw recognize the performance value.

In Example 21, the subject matter of Example 20 may optionally include the second unit configured to determine the first power value based on the composite signal power estimated over the third portion of the transmission from the serving cell, the third portion being cell-specific Reference signals includes.

In example 22, the subject matter of any one of examples 20-21 may optionally include the third unit configured to derive the second power value based on the resource elements of the second resource composite signal estimated power of the composite signal, wherein the resource elements are scaled according to the first power scale.

In example 23, the subject matter of any of examples 20-22 may optionally include the fourth unit configured to detect the interference scenario based on a two-dimensional threshold with respect to the first power value and the second power value.

In example 24, the subject matter of any one of examples 20-23 may optionally include the second entity and the third entity configured to determine their respective performance values over one of a resource block and a subframe of the composite signal.

Example 25 is an interference scenario detection apparatus, the apparatus comprising: receiving means for receiving a composite signal comprising transmissions from a plurality of cells, each transmission comprising a first part scaled according to a first performance scale, a second part corresponding to a first part second power scale, and a third part sent with a fixed power value comprises first determining means for determining a first power value based on the third parts of the transmissions, second determining means for determining a second power value based on the first parts of the first power value Transmissions and detection means for detecting an interference scenario based on the first power value and the second power value.

In Example 26, the subject matter of Example 25 may optionally include the transmissions from multiple cells comprising transmission from a serving cell and transmissions from at least one interfering cell.

In Example 27, the subject matter of any of Examples 25-26 may optionally include the first determining means configured to suppress a portion due to transmission from the serving cell in the received composite signal.

In Example 28, the subject matter of Example 27 may optionally include the first determining means configured to determine the portion due to transmission from the serving cell by a channel estimate and a reference signal from the serving cell.

Example 29 is a computer-readable medium having computer instructions stored thereon which, when executed by a computer, cause the computer to perform the method of any of Examples 1-19.

Example 30 is a transmission system that includes a radio receiver that includes an interference detection device according to any of Examples 20-24 and at least one transmitter that is configured to transmit a radio signal over multiple antenna ports.

In example 31, the subject matter of example 30 may optionally include the radio receiver including a plurality of receive antennas configured to receive the composite signal.

Example 32 is a transmission system comprising a radio receiver including an interference detection device according to any one of Examples 20-24 and a plurality of radio cells, each radio cell adapted to transmit a radio signal.

In Example 33, the subject matter of Example 32 may optionally include that each radio cell includes a plurality of transmission antennas configured to transmit the radio signal of each radio cell and that the radio receiver comprises a plurality of reception antennas configured to receive the composite signal.

While a particular feature or aspect of the invention may have been disclosed with reference to only one of several implementations, that feature or aspect may be additionally combined with one or more other features or aspects of the other implementations as may be the case for one or more embodiments special application may be desirable and advantageous. Further, to the extent that the terms "having," "having," "having," or other variants thereof are used in either the detailed description or the claims, they are to be taken to include such terms in a similar manner to the term "comprising." become. Further, it should be understood that aspects of the invention may be implemented in discrete circuits, partially integrated circuits, or fully integrated circuits or programming means. Also, the terms "serving as an example", "for example" and "e.g. For example, "as an example and not as the best or best way.

Although specific aspects have been illustrated and described herein, it will be understood by those of ordinary skill in the art that a variety of alternative and / or equivalent implementations may be substituted for the specific aspects illustrated and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific aspects discussed herein. Explanation of symbols Fig. 14 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (non-coll, INR: 3 dB, coll, 3 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (not koll, INR: 3 dB, koll, INR: 3 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (non-coll, INR: 3 dB, coll, INR: 10 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (not koll, INR: 3 dB, koll, INR: 10 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (non-coll, INR: 10 dB, coll, 3 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (not koll, INR: 10 dB, koll, INR: 3 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (non-coll, INR: 10 dB, coll, INR: 10 dB) 2 × 2, SNR: 14 dB, EVA-5 Hz, 2 aggressors (not koll, INR: 10 dB, koll, INR: 10 dB) P _noise [d ^B ] P _noise [dB]

Claims (6)

Procedure ( 800 ) for providing a plurality of interference detection thresholds based on a composite signal ( 400 ), which is a transmission from a serving cell ( 203 ) and multiple transmissions from multiple interfering cells ( 201 ), the method comprising: estimating ( 801 ) a signal-to-noise ratio (SNR) of the serving cell ( 203 ) at a receiver, estimating ( 802 ) for each of the plurality of interference cells ( 201 ) of an interference-to-noise ratio (INR _n , INR _m ) at the receiver and providing ( 803 ) of the plurality of threshold values based on the signal-to-noise ratio (SNR) of the serving cell ( 203 ), the interference-to-noise ratios (INR _n , INR _m ) of the interfering cells ( 201 ) and information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ), the transmissions of the composite signal ( 400 ) a first part ( 406 ) scaled with a first power scaling value (rhoA) and a second part ( 404 ) scaled with a second power scaling value (rhoB) and wherein the plurality of thresholds are provided based on the first power scaling values (rhoA) and the second power scaling values (rhoB), and wherein the plurality of thresholds are used to determine different interference scenarios to recognize. Procedure ( 800 ) according to claim 1, wherein the transmissions from the plurality of interfering cells ( 201 ) Transmissions of a plurality of interference cells which are connected to a reference signal (R0, R3) of the serving cell ( 203 ) and multiple transmissions from a plurality of interference cells that do not interfere with the reference signal (R0, R3) of the serving cell ( 203 ) collide. Procedure ( 800 ) according to one of the preceding claims, comprising: providing a first power value (P ' _{noise, RB} ) on the basis of adding expected received powers as a result of the first part ( 406 ) of the composite signal ( 400 ) corresponding to the information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ), and Providing a second power _value (P ' _{rhoA, RB} ) based on the adding of expected received power as a result of the second part ( 404 ) of the composite signal ( 400 ) corresponding to the information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ), and providing the plurality of thresholds based on the first power value (P ' _{noise, RB} ) and the second power _value (P' _{rhoA, RB} ). Contraption ( 900 ) for providing a plurality of interference detection thresholds based on a composite signal ( 400 ), which is a transmission from a serving cell ( 203 ) and multiple transmissions from multiple interfering cells ( 201 ), the device ( 900 ) Comprising: a first unit ( 905 ), which is designed to reduce the signal-to-noise ratio (SNR) of the serving cell ( 203 ) at a receiver; a second unit ( 906 ) designed for each of the plurality of interfering cells ( 201 ) estimate an interference-to-noise ratio (INR _n , INR _m ) at the receiver; and a third unit ( 907 ), which is designed to generate a plurality of threshold values based on the signal-to-noise ratio (SNR) of the serving cell ( 203 ), the interference-to-noise ratios (INR _n , INR _m ) of the interfering cells ( 201 ) and information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ), the transmissions of the composite signal ( 400 ) a first part ( 406 ) scaled with a first power scaling value (rhoA) and a second part ( 404 ) scaled with a second power scaling value (rhoB) and wherein the plurality of thresholds are provided based on the first power scaling values (rhoA) and the second power scaling values (rhoB), and wherein the plurality of thresholds are used to determine different interference scenarios to recognize. Contraption ( 900 ) according to claim 4, wherein the transmissions from the plurality of interfering cells ( 201 ) Transmissions of a plurality of interference cells which are connected to a reference signal (R0, R3) of the serving cell ( 203 ) and multiple transmissions from a plurality of interference cells that do not interfere with the reference signal (R0, R3) of the serving cell ( 203 ) collide. Contraption ( 900 ) according to claim 4 or 5, comprising: a fourth unit ( 903 ) which is designed to generate a first power value (P ' _{noise, RB} ) based on adding expected received powers due to the first part ( 406 ) of the composite signal ( 400 ) corresponding to the information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ) to provide; and a fifth unit ( 902 ) designed to generate a second power _value (P ' _{rhoA, RB} ) on the basis of adding expected received _powers due to the second part (P' _{rhoA, RB} ) 404 ) of the composite signal ( 400 ) corresponding to the information (S _k (s)) indicating an activity state of the plurality of interfering cells ( 201 ), the third unit ( 907 ) is _{configured to} provide the plurality of thresholds based on the first power value (P ' _{noise, RB} ) and the second power _value (P' _{rhoA, RB} ).

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