UA105857C2 - Spatial interference mitigation for wireless communication - Google Patents

Abstract

Techniques for transmitting and receiving data with spatial interference mitigation in a wireless network are described. In one design of transmitting data with spatial interference mitigation, a first station (e.g., a cell) may receive spatial feedback information (SFI) from a second station (e.g., an interfered UE) that is not communicating with the first station. The second station may also receive preceding information from a third station (e.g., a served UE). The first station may send a data transmission to the third station based on the preceding information and the SFI in order to reduce interference to the second station. In one design, the SFI may include spatial nulling information. The first station may send the data transmission based on the spatial nulling information to steer the data transmission in a direction away from the second station.

Description

Fig. 4 - uplink data transmission with spatial interference suppression.

Fig. 5 and 6 - process and device, respectively, for data transmission with spatial interference suppression.

Fig. 7 and 8 - process and device, respectively, for receiving data with spatial interference suppression.

Fig. 9 - block diagram of the base station and OE.

Detailed description

The methods described here can be used for various wireless networks, such as

SOMA, TOMA, ROMA, OBOMA, 50-ROMA and other networks. The terms "network" and "system" are often used interchangeably. The SOMA network can implement radio technology such as universal terrestrial radio access (UTA), sata2000, etc. OTAA contains a system of broadband

SOMA (M/SOMA) and other variants of SOMA. sata2000 covers standards 1І5-2000, 15-95 and І5-85. Chain

TOMA can implement radio technology, such as the Global System of Communication with Moving Objects (Y05M). The BOMA network can carry radio technology such as Emoimea OTWA (E-OTWA), Shiga

Mobiie Vgoadbapa (MV), IEEE 802.11 (M/i-ERi), IEEE 802.16 (M/MAX), IEEE 802.20, Riaz!p-OBOMF, etc.

TVA and E-OTVA are part of the universal mobile communication system (0OMT5). Systems of ZOaRR and op4d

Tept Emoishiop (I TE) and I TE-Aduapsea (I TE-A) are new editions of OMT5 that use E-OTVA,

TVA, B-OTVA, OMT5, I TE, I TB-A and C5M, described in the documents of the organization called "3rd Generation Partnership Project" (ZEPR). sata2000 OMV, described in the documents of the organization called "Project 2 of the 3rd generation partnership" (ЗЕРР2). The methods described herein may be used for the wireless networks and radio technologies mentioned above, as well as for other wireless networks and radio technologies. For clarity, specific aspects of the methods are described below for I TE and I TE terminology is used throughout most of the description below.

In fig. 1 shows a wireless communication network 100, which may be an ITE network or some other network. The wireless network 100 may contain numerous advanced nodes B (EMV) and other network objects. For simplicity in fig. 1 shows only two eMV nodes, 110a and 11005. An eMv node can be a station that communicates with the ESR, and may also be referred to as a base station, node B, access point, etc. Each eMv node 110 can provide coverage communication for a specific geographical area. In ZEORR, the term "cell" may belong to the coverage area of the eMV node and/or to the subsystem of the eMV node that serves this coverage area, depending on the context in which the term is used.

The emMmV node can provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other cell types. A macrocell can cover a relatively large geographic area (for example, a radius of several kilometers) and can allow unlimited access for subscriber-serviced SES. A picocell can cover a relatively small geographic area and can allow unlimited access for subscriber-based SES. A femtocell may cover a relatively small geographic area (eg, a home) and may allow limited access for UEs communicating with the femtocell (eg, EOs for home users). An eMV node for a macrocell may be referred to as a macro-eMMV. An eMV node for a picocell may be referred to as a pico-eMV. An eMv node for a femtocell may be referred to as a femto-eMv or a home eMv. In the example shown in fig. 1, the eMV node 110a may be a macro-eMV for macrocell X. The eMV node 1106 may be a pico-eMV for picocell M or a femto-eMV for femtocell U. The eMV node may support one or multiple (eg, three) cells.

Wireless network 100 may also include relay stations. A relay station is a station that receives the transmission of data and/or other information from a station on an uplink communication channel (for example, from an eMMV node or SHE) and sends data and/or other information to a station on a downlink communication channel (for example, on SHE or to the eMV node). A relay station can also be an UE that relays transmissions for other UEs.

The wireless network 100 may be a homogeneous network that contains eMV nodes of the same type, such as only macro-eMmV or only femto-eMmV. The wireless network 100 may also be a heterogeneous network that contains eMV nodes of different types, such as macro-eMV, pico-eMV, femto-eMV, relay stations, etc. These different types of eMV nodes may have different transmission power levels, different areas coverage and different effects on interference in a wireless network 100. For example, macro-EMVs may have a high level of transmit power (e.g., 20 watts), while pico-EMV, femto-EMV, and relay stations may have a lower level of transmit power (e.g. , 1 watt). The methods described here can be used for both homogeneous and heterogeneous networks.

The network controller 130 can connect to a number of eMV nodes and provide coordination and control of these eMV nodes. The network controller 130 can communicate with the eMV nodes 110 through the transit module. Nodes eMV 110 can also communicate with each other, for example, directly or indirectly through a wired or wireless transit module.

UEs may be distributed throughout the wireless network 100 and each UE may be fixed or mobile. For simplicity, in fig. 1 shows only four ESRs, 120a, 12065, 120c, and 1204, and they are also referred to as ESRs 1, 2, C, and 4, respectively. A WAN may also be referred to as a terminal, mobile station, subscriber unit, station, etc. A WAN may be a cellular telephone, a wireless minicomputer (WPC), a wireless modem, a pocket computer, a notebook computer, a cordless telephone, wireless subscriber access (MM) station, etc. In fig. 1 solid line with a single arrow indicates the desired data transfer from the serving cell to

OE, and the dashed line with a single arrow indicates the interfering transmission from the interfering cell to

IT. A serving cell is a cell designed to serve the SOE on the downlink and/or uplink line (channel) of communication. A non-serving cell may be an interfering cell that causes interference to the ESR on the downlink and/or an interference-affected cell that observes interference from the OE on the uplink. Transmissions on the uplink of Fig. 1 are not shown for simplicity.

The TE uses orthogonal frequency-division multiplexing (FDM) on the downstream channel and single-carrier frequency-division multiplexing (CDMA) on the upstream channel. OROM and 50-ROM divide the system bandwidth into a set (K) of orthogonal subcarriers, also commonly referred to as tons, bins, etc.

Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain using OBEOM and in the time domain using 5C-ECM. The total number of subcarriers (K) may depend on the bandwidth of the system. For example, K can be 128, 256, 512, 1024, or 2048 for a system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

The system bandwidth can also be divided into sub-bands, and in ITU each sub-band can cover 1.08 MHz.

In I TE, the transmission time schedule for each link can be divided into blocks of subframes.

Each subframe may have a specified duration, such as 1 millisecond (ms), and may contain two time slots. Each time slot can contain six symbol periods for an extended cyclic prefix or seven symbol periods for a normal cyclic prefix. Available frequency and time resources for each communication channel can be divided into resource blocks. Each block of resources can cover a specific time and frequency dimension, for example, 12 subcarriers in one time interval AND TE.

The UE may communicate with the serving cell in the main interference scenario, which is a scenario in which () the UE may experience high interference from one or more interfering cells on the downlink and/or (ii) the serving cell may experience high interference from side of one or more interfering ESRs on the upstream channel. The main interference scenario can occur due to range extension, which is a scenario in which the ESR connects to a cell with lower path loss and lower geometry among all cells detected by the ESR.

For example, in fig. 1 CE 2 can detect macrocell X and picocell Y and may have a lower reception power for picocell M than for macrocell X. However, it may be desirable for CE2 to connect to picocell Y if the path loss for cell M is lower than path loss for macrocell X. This can result in less interference in the wireless network for a given data rate for ESR 2. The main interference scenario can also occur due to limited communication. For example, in fig. 1 CE 1 may be close to femtocell M and may have high reception power for this cell. However, UE 1 may not be able to access femtocell Y due to a limited connection and may then connect to macrocell X, which is not limited, with a lower reception power. OE 1 may then observe high interference from femtocell U on the downlink and may also create high interference for cell U on the uplink.

Alternatively, spatial interference suppression may be performed for downlink data transmission to reduce ESR interference. In one project, the SHE can identify and provide spatial feedback information (SAF) for the interfering cell. The interfering cell can send its transmission based on 5EI to reduce the interference to ESR.

The following types of information may be available:

Spatial feedback information - information used to reduce interference for a station exposed to interference; - information for spatial zeroing - information used to select the direction of transmission away from the station that is affected by the interference; - precoding information - information used to direct the transmission in the direction of the target station, and - nulling gain information - information indicating the reduction of interference due to spatial interference suppression.

For spatial downlink interference suppression, the 5EI may contain (i) spatial zeroing information for the interfering cell, which may be used by that cell to direct its transmission away from the ESR, (ii) precoding information for the serving cell for the ESR, which may be used by the interfering cell to direct its transmission away from the serving cell to the SE, (iii) gain information for zeroing, and/or (im) other information. Different types of information for 5EI can be defined as described below.

In one design, the UE may estimate the downlink characteristic of the interfering cell based, for example, on a reference signal or a pilot signal sent by the cell on the downlink. The evaluation of the downlink communication channel can be represented by the channel matrix V x Xt as: pocha 0-0 th pgyai Pa 0-0 Pot

No - . pi bPva o. tue () where No . channel matrix for the downlink channel from the interfering cell to OE i,

Pa for /-1,..., B, ii-1,..., T, is the complex gain coefficient between the transmitting antenna y in the interfering cell and the receiving antenna г in the SHE,

T is the number of transmitting antennas in the interfering cell, i

B - the number of receiving antennas in the ESR.

The Nim channel matrix contains A rows for LCD receiving antennas in SOE. Each row of Ni corresponds to one channel vector Ni for one receiving antenna in the SHE. If OE is equipped with a single antenna, then Ni contains a single line for a single channel vector. A matrix can thus degenerate into a vector for which there is only one row or one column. The downlink estimate can be obtained for all or part of the system bandwidth, for example, for a sub-band in which the SES may be planned to operate.

In the first design of 5ERI, ZERI may contain a channel direction indicator (CDI) for the interfering cell. SOY for interfering honeycomb can be defined in different ways. In one project, OE can quantize No. based on the codebook of quantized channel matrices. The ESR can evaluate each quantized channel matrix in the codebook as follows:

N

On/ - Inni (2) de Ne. The 1st quantized channel matrix in the codebook, (Ф) . g. "NN, .

NO. metric indicator of orthogonality between No; Ni g "H" means Hermitian or complex connected element. - 0. . . . . not

The metric "M can be calculated for each quantized channel matrix in the codebook. grandfather: i On, . . : .

Quantized channel matrix No. which has the largest "Mi and corresponds to Nim as closely as possible can be selected and provided as the SOY for the interfering cell. The channel matrix of Nim can thus be quantized in NI. which is maximally correlated with Nim (rather than maximally orthogonal to Nim ).In another design, the ESR can quantize each No line based on the codebook of quantized channel vectors, and can obtain a quantized channel vector for each No line, the ESR can also quantize Nim in other ways. The size of the codebook of the quantized channel matrices or vectors can be chosen as , to obtain a good nulling rate while reducing service signaling. The SOI for the interfering cell may contain the index of the quantized channel matrix, the index of each quantized channel vector, and/or other information. The UE may send the SOI as an ORI to the interfering cell. Since No about which is reported indicates the direction from the interfering cell to the OE, the interfering cell can you take the precoding matrix to be as orthogonal as possible to No to lower the interference on the SHE.

In the second draft from 9РІ, the РРІ may contain a precoding matrix indicator (PRM) for the interfering cell. The RMI for an interfering cell can be defined in different ways. In one design, the AE may select a precoding matrix from a codebook of precoding matrices that is as far as possible orthogonal to No - the AE may evaluate each precoding matrix in the codebook as follows:

Or - IN vi , (3) where R. is the 1st matrix of pre-coding in the code book, and (F) . Mr. N,

РИ is a metric indicator of orthogonality between Ри Нв, . - Or. Ave

The ESR may select the precoding matrix that has the smallest ""/ and is the most orthogonal to No, the ESR may send the index of this precoding matrix as the 5RPI for the interfering cell. The selected pre-coding matrix may contain the "best" set of linear combinations of effective antennas, resulting in the greatest reduction of interference on the UE.

In another design, the OE can calculate the precoding matrix Vo, which is as orthogonal as possible to Nim - the PE can perform the eigenvalue decomposition as follows:

NENI-ELE (4) where E is the unitary THT matrix of the eigenvalue vector Nim i

A is the diagonal THT matrix of Nis eigenvalues.

NOT.

The unitary matrix E is characterized by the property EE where | - unit matrix. The columns of E are orthogonal to each other and each column has unit power. The downlink channel from the interfering cell to the SE has 5 eigenmodes, where ze typivt), Columns T in the matrix E are referred to as vectors T of eigenvalues and can be used to send data on eigenmodes Nim .

The diagonal elements of the matrix 7 are the eigenvalues, which represent the gain coefficients in terms of the power of the eigenmodes Nim . The diagonal elements T of the matrix L are related to the eigenvectors T of the matrix E. If VT, then LA can contain up to B nonzero diagonal elements and zeros for other diagonal elements. The eigenvectors in the matrix E corresponding to zero diagonal elements in

A, are orthogonal to Nim and can be entered into the pre-coding matrix Be. OE can quantize Ne (for example, as described above for Ne ) to obtain 5PRI for the interfering cell.

The ESR can send 5EI to the interfering cell, which can then select a precoding matrix to match the quantized P as much as possible to reduce the interference to

ABOUT.

In yet another design, the WAN may be equipped with multiple receiving antennas and may determine a precoding matrix for the interfering cell, taking into account its ability to null upon reception. The UE can derive the spatial filter matrix based on the channel matrix for the serving cell. The UE can then perform spatial processing of the transmission from the serving cell for the receiver using the spatial filter matrix. The OE can evaluate each precoding matrix in the codebook, assuming that the spatial filter matrix will be used in the ESR. The OE can choose a precoding matrix capable of providing the best receiver performance using a spatial filter matrix. The UE may provide the selected precoding matrix as 5RPI for the interfering cell.

In the third project 5EI, 5ERI for the interfering cell may contain CO! or RMI for the serving cell. The UE can estimate the downlink for the serving cell and can determine the SOI or PMI based on the downlink Na matrix for the serving cell. The SOI may contain the index of the quantized channel matrix, the index of each quantized channel vector, etc. The PMI may contain the index for the pre-coding matrix or vector to be used by the serving cell for the OSE, etc. The PSI may send the SOI or PMI for the serving cell as 5ERI for interfering cell. Since the SOI/RMI of the serving cell indicates the direction from the serving cell to the CE, the interfering cell can choose the precoding matrix to be as orthogonal as possible to the SOI/RMI of the serving cell to reduce interference to the CE. For example, an interfering cell can plan an ESR that can be minimally disturbed by the beam selected by the serving cell.

In another design, the 5EI for the interfering cell may contain a number of orthogonal vectors that may provide some spatial processing for the receiver on the ESR. For example, 5PRI may contain one or more vectors that may be orthogonal to one or more principal eigenvectors of the channel matrix Nu , which may be obtained as shown in equation (4). As another example, certain spatial processing for the receiver may be adopted for ESR when transmitting data from the serving cell. The RIP may then contain one or more vectors that may be orthogonal to the active channel between the transmit antennas on the interfering cell and the spatial processing outputs for the receiver on the ESR.

In general, the spatial zeroing information for the interfering cell may contain SOI or

RMI for the interfering cell, SOI or RMI for the serving cell and/or some other information. The interfering cell can use the spatial nulling information to determine a precoding matrix that can direct its transmission away from the E direction.

In one design, the 5RPI may contain a transmit zero gain (TNO) resulting from the interfering cell's application of the spatial zero information provided by the UE.

The ESR can estimate (i) the interference power of the IEE from the interfering cell, when this cell applies information for spatial zeroing and (ii) the interference power of IOI from the interfering cell, when this cell does not apply information for spatial zeroing (or working open circuit). The SHE can determine the gain for transmission zeroing as the ratio of ISER to IOR. The transmit null gain can thus indicate the amount of interference power reduction from the interfering cell if the spatial null information is used by that cell instead of open-loop transmission.

The interfering cell can determine the transmit power level to use to obtain a target interference level on the CE. The interfering cell may be able to increase this transmit power level by means of a transmit null gain when the cell applies the spatial null information.

In another design, the 5EI may contain a receive null gain (NGN) for the interfering cell, which is the result of performing a spatial processing SE for the receiver of the serving cell. This design may be particularly applicable if the interfering cell is equipped with a single transmit antenna and is unable to perform direction selection for spatial nulling. The receive null gain may indicate the amount of interference power reduction due to performing CE spatial processing for the receiver and may be determined as described below. The interfering cell can then determine its transmit power level based on the receive null gain to, for example, achieve a target interference level on the CE. The gain for receive nulling can also be factored within the target interference level for the SHE. An interfering cell may not need to know the value of the receive nulling factor, but rather needs to know the target interference level for the SHE.

The AE can send 5BTS to the interfering cell to support spatial interference suppression. 5EU may contain CO! or RMI for the interfering cell, SOI or RMI for the serving cell, gain factor for nulling during transmission and/or other information. In one project, the SHE can send 5UEs directly to the interfering cell. In another design, the UE can send 5EI to the serving cell, which can send 5RI to the interfering cell, for example, through level C signaling (I 3), the exchange of which is performed through the transit module. OE can send 5RI at a fairly high speed, which may depend on the mobility of the SHE and, possibly, on other factors. For example, a CE may send 5RIIs at a higher rate to an interfering macrocell to allow zeroing when transmitted by that cell in a low mobility state for the CE. The CE can send 5PRI at a slower speed of the interfering pico- or femtocell in the static or quasi-static state of the OE. The OE may also send 5PRI whenever needed as described below.

In general, the 5RPI should match a relatively fresh channel estimate to get a good null on transmission.

In another aspect, spatial interference suppression may be performed for uplink data transmission to reduce interference to cells. Spatial suppression of interference for the uplink channel can be performed in different ways, depending on whether the UE is equipped with one or many transmitting antennas.

In one design, an interfering UE equipped with multiple transmit antennas can spatially control its transmission to reduce interference to the cell. The cell may estimate the uplink from the interfering ESR to the cell and may determine information for spatial nulling based on the estimated uplink, for example using any of the designs described above for the downlink. The cell may also determine the nulling gain, for example as described above for the downlink. The 5EI for the interfering UE may contain information for spatial zeroing, the gain factor for zeroing during transmission, etc. The cell can send the 5EI to the interfering OE. An interfering UE can use 5RPI to spatially direct its transmission away from the cell and/or reduce its transmission power.

In another design, the cell can perform nulling of interference during reception for the interferer

ESR equipped with a single transmitting antenna. A cell can select an UE to serve, taking into account the interfering UE.

A cell can receive received symbols which can be expressed as follows:

Tv - Piv Bi UPB, Jap - Puebu Pi (c) where Zy is a data symbol sent by the served OE and, 5; and !

And - the data symbol sent by the interfering OE ),

Pov is the channel vector for the uplink channel from the served SHE to cell 5, p; . . . ! .

Iz is the channel vector for the upstream channel from the interfering SHE | to cell 5,

And - . . - the vector of received symbols in cell 5,

Half is the vector of total noise and interference in cell 5, i

Pe is the vector of total noise and interference, except from the SHE and, in cell 5.

The cell can perform spatial processing for the receiver to recover the data symbols from the served UE and suppress/nullify the data symbols from the interfering UE. The cell can choose the vector t of the spatial filter, which (ii) corresponds to the serviced SHE as much as shk . AND; possibly close, and (it) is as orthogonal as possible to Iz for the interfering ESR. In one project, the vector t of the spatial filter can be determined based on the minimum address mean square error (MM5E) of the receiver filter, and can be calculated as t - aNda half,; where a is the scaling factor and t is the covariance matrix of the sum of noise and interference. In another design, the cell may evaluate each entry in the spatial filter vector codebook and may select the spatial filter vector with the best signal-to-noise ratio (5IMA). The cell may also determine the spatial filter vector in other ways.

The cell can perform spatial processing for the receiver as follows:

Зу Тв Бу во (6) where Зи is the detected symbol for the serviced SE M, and

Pvt. noise and interference after spatial processing for the receiver in cell 5.

The processing shown in equation (b) can be performed for each subcarrier in each symbol period.

The cell can determine the gain to zero when receiving for the interfering ESR as a result of the cell's spatial processing for the receiver of the served ESR. The cell can estimate (ii) the power Ivhg of the interference from the interfering ESR with the cell performing spatial processing for the receiver, and (ii) the power Ilo yahg of the interference from the interfering ESR without the cell performing the spatial processing for the receiver. The cell can determine the zeroing coefficient during reception as the ratio of IR to input. The receive null gain can thus indicate the amount of interference power reduction due to the cell performing spatial processing for the receiver. The cell can provide a gain factor for nulling when receiving on an interfering ESR. The cell or the interfering ESR can calculate the target transmit power level for the ESR, taking into account the receive null gain to obtain the target interference level for the cell. The interfering OE may be able to increase its transmit power by a gain factor for nulling when receiving.

The cell can determine the amplification factor for nulling during reception for a specific pair of the served CE and the interfering OE. If UE pairing is not desired, then the cell can calculate an expected (eg average) receive null gain or a worst case receive null gain based on the number of UEs that may be served and their channel states. The use of gain for nulling at reception can be particularly applicable in femto-deployments, when each femtocell can serve only one or more UEs and can have only one or more interfering UEs.

Therefore, a limited number of pairs of served CE and interfering OE can be present during femtoconvolution.

The cell can send 5EIs for the interfering SHE. 5 may contain (i) information for spatial nulling and/or gain for nulling when transmitting, if the UE is equipped with multiple antennas, (ii) gain for nulling when receiving, if the UE is equipped with a single antenna, and/or (ii) other information . In one design, the cell can send 5BEI directly to the interfering ESR. In another design, the cell can send 5EI to the serving cell of the interfering SOE, for example, through signaling C, which is exchanged through the transit module. The serving cell can then send 5ERIs to the interfering ESR. Cell can send

ЗР at the appropriate speed. The quantization for 5EI can be chosen to obtain good spatial nulling. The same or different quantization levels can be used for 5PI sent over the air and PI sent through the transit module.

Spatial interference suppression for the downlink and uplink communication channels can be performed differently. In one design, spatial interference suppression for a given link can be triggered when warranted (instead of running all the time). For example, spatial interference suppression can be triggered when a primary source of interference is detected. In one design, 5ERI can be sent at the appropriate speed to support spatial interference suppression. In another design, 5EI may be invoked when triggered by an event that may reduce the volume of service signaling. For example, 5ERI may be invoked if there is a noticeable change in the spatial null information, the transmit null gain, and/or the receive null gain, eg when the change in the spatial null information or the null gain exceeds a certain threshold.

The spatial interference suppression methods described here can be used for frequency-division duplex networks (DDU) as well as time-division duplex networks (DDU). For ROO, the downlink and uplink communication channels may be distributed over separate frequency channels, and the channel response for the downlink may not have a good correlation with the channel response for the uplink. For an EOO network, the UE can estimate the downlink characteristic for the interfering cell, determine the 5RPI based on the downlink characteristic, and send the 5RPI to the interfering cell as described above. The cell may also estimate the uplink characteristic for the interfering ESR, determine the 5EI based on the uplink characteristic, and send the 5EI to the interfering ESR, as also described above. For TOU, the downlink and uplink can share the same frequency channel and the downlink channel characteristic can be correlated with the uplink characteristic. For an LLP network, the interfering cell can estimate the uplink characteristic for the EB based on the reference signal from the EB, estimate the downlink characteristic based on the uplink characteristic, and use the downlink characteristic to direct its transmission away from the EB. The jamming ESR can also estimate the downlink characteristic for the cell based on the reference signal from the cell, estimate the uplink characteristic based on the downlink characteristic, and use the uplink characteristic to direct its transmission in the direction away from the cell. An interfering station may thus be able to receive 5PRI based on its channel estimate without having to receive 5PRI from the interfering station.

Spatial interference suppression can be supported for a given link using different signaling messages and timing schedules. Some examples of time schedules and messages for spatial interference suppression on downlink and uplink communication channels are described below.

In fig. 2 shows a design scheme 200 for transmitting data over a downlink with spatial interference suppression. For simplicity, in fig. 2 shows only two cells Xi M and two cells 112 in fig. 1. Cell X is a serving cell for UE 1 and an interfering cell for UE 2. Cell

U is the serving cell for CE 2 and the interfering cell for SHE 1.

Cell X may have data to refer to ESR 1 and may know that ESR 1 is experiencing high downlink interference. For example, cell X may receive measurement results reports for the pilot signal from UE 1 and the reports may indicate and/or identify the strongly interfering cell M. Cell X may send a 5ERI request to UE 1 to ask UE 1 to determine and send 5EI to the interfering cell U and/or (ii) determine and send a feedback signal to the serving cell X. The 5EI request may contain different types of information, as described below.

Similarly, cell M may have data to refer to ESR 2 and may know that ESR 2 is experiencing high downlink interference. Cell M can then send a 5PRI request to HSE 2 and request that HSE 2 identify and send 5PHI to the interfering cell X.

CE 1 may receive a 5REI request from its serving cell X. In response to a 5REI request, CE 1 may estimate the downlink characteristic for the interfering cell Y and may determine the 5REI for cell Y based on the downlink characteristic, for example, as described above. UE 1 can then send 5PIR to the interfering cell M. UE 1 can also evaluate the downlink characteristic for its serving cell X, determine the pre-coding information (eg, SOI or RMI) for cell X and send the pre-coding information to cell X. Similarly, UE 2 can receive a 5RI request from its serving cell Y, estimate the downlink characteristic for interfering cell X, determine 5EI for cell X based on the downlink characteristic, and send 5RI to cell X. UE 2 can also estimate the downlink characteristic for its of the serving cell U, determine the precoding information for the cell U and send the precoding information to the cell U.

Cell X can receive pre-coding information from SHE 1 and 5RI from interfering UE 2. Cell X can determine the pre-coding matrix Px to use for data transmission based on pre-coding information from SHE 1 and 5RI from OE 2. Cell X can also determine the Horn level, x for use in data transmission based on the gain to zero when transmitting from CE 2, the target interference level for CE 2, and/or other information. Cell X can then transmit a reference signal of the resource quality indicator (RQI) using the matrix Px of pre-coding and with a level of P'di-»e,x POWER, which can be equal to

Ramah or scaled version of Raza, x. A reference signal or a pilot signal is a transmission that is known a priori to the transmitter and receiver. The VIR reference signal can also be referred to as a power decision pilot. The COI reference signal may be a forward reference signal sent with a precoding matrix and/or may have a variable transmission power level. Cell X may also send an EI request to UE 1 and/or other UEs served by cell X. The EI request may request EI 1 to estimate the channel quality for cell X based on the EI reference signal and send an EI to cell X. Similarly, cell M may determine the precoding matrix Ru to be used for data transmission based on the precoding information from SHE 2 and 5RI from SHE 1. Cell M may also determine the transmit power level Raaiau to use for data transmission based on the gain to zero during transmission from SHE 1, the target interference level for SHE 1 and/or other information. Honeycomb

U may then transmit a reference signal VOY with the Ru precoding matrix and with a level of Rig, in power transfer, which may be equal to Razach or a scaled version of Raz, y. Cell M can also send a POI request to SHE 2 and/or other UEs served by cell U.

SHOE 1 can receive KO reference signals! from cells X and M, as well as a NOI request from its serving cell X. In response to a BOI request, SOE 1 can evaluate the channel quality for serving cell X based on reference signals of VO from all cells. The UE reference signals can allow the UE 1 to more accurately estimate the channel quality that the UE 1 can expect to transmit data from the serving cell X, taking into account the pre-coding matrices and power transmission levels that the cells are expected to use. OE 1 can determine the ROI, which can contain an assessment of 5IMA for the quality of the channel, the modulation and coding scheme (MO5), determined on the basis of the assessment

WINTER, etc. UE 1 can send BOI to its serving cell X. Similarly, UE 2 can receive BOI reference signals from cells X and M, as well as a BOI request from its serving cell M. UE 2 can evaluate the channel quality for of the serving cell U, determine VO), and send VOI to cell U.

Cell X can receive UEs from CE 1, schedule UE 1 for data transmission, select MO5 based on UEs, and process data for UE 1 according to the selected UE5. Cell X may generate a downlink grant (DLG), which may also be referred to as a resource assignment, scheduling grant, etc. A downlink grant may indicate assigned resources, selected

MOH, etc. Cell X can send the downlink handover and data transmission to UE 1. UE 1 can accept the downlink handover and data transmission and can decode the received transmission according to the selected MSO5. The ESR 1 can generate confirmation information (ACI) that can indicate whether the data has been decoded correctly or in error. SHE 1 can send ACS information to its serving cell X. Cell Y can similarly transfer data to SHE 2.

In fig. ZA-30 presents message transmission for the downlink data transmission scheme shown in fig. 2. Each cell may first select one or more UEs for possible data transmission using a set of frequency and time resources (for example, one or more resource blocks). The initial selection of UEs may be based on various factors, such as UE priorities in different cells, channel information for UEs, cell downlink buffer status, quality of service (005) requirements, network optimization criteria (e.g., bandwidth, peer access), etc. d. The channel information for SHE can be long-term and the exchange between cells can be carried out through a transit module, for example the X2 interface according to I TE.

Selected OEs can be considered pre-planned ESSs. Each cell can send a request

ARI to each selected ESR, as shown in fig. BY. Each selected CE may determine and send pre-coding information (eg, SOI) to its serving cell and may also determine and send 5ERI to each interfering cell specified in the RI request for that CE, as shown in FIG. ZV.

Each cell can receive precoding information from each selected ESR, as well as 5EI from each interfering ESR. Each cell can accept or reject 5RIs from interfering ESRs based, for example, on utility levels, priorities, etc. Each cell can schedule one or more ESRs to transmit data on a set of frequency and time resources based on various factors, such as those described above for initial CE selection. It is planned for each cell

The ESR can be the same as or different from the originally selected ESR. A given cell may not be able to apply the appropriate precoding matrix for the selected ESR, for example, due to a scheduling conflict between this cell and another cell and may then schedule another ESR. For example, cell M may first select EB 2, may be unable to use the appropriate precoding matrix for EB 2 due to a scheduling conflict with cell X, and may then schedule EB 4, which may be less disturbed by interference from cell X. This flexibility may allow cells to schedule CE, which may allow them to take advantage of the spatial beams available to the cells.

Each cell can determine a pre-coding matrix to use for the planned SNE and can also determine a transmit power level to use for data transmission. Each cell can then send a VE reference signal as well as a VE request to each scheduled ESR, as shown in FIG. ZS. This cell can send Swarm requests and 5RI requests to different SHEs. For example, cell U can send a 5РІ request to SHE 2 and can later send a ВОІ request to

ESR 4. A cell may also send BOI requests to multiple SERs for the same set of frequency and time resources to allow the cell to make a scheduling decision during the process based on the SERs from these SERs. Each scheduled CE can identify and send NOI to its serving cell, as shown in Fig. 30.

In the project shown in fig. 2-30, the serving cell may send a 5RPI request to the UE to request the UE to send a 5RPI to the interfering cell. In another design, the interfering cell can send an ORI request to the UE to ask the UE to send 5BRI to that cell. Other objects can also send a 5RY request. For example, the UE can autonomously decide to send 5РЙ to a strong interfering cell.

In fig. 4 shows the design of the scheme 400 for transmitting data over an uplink with spatial interference suppression. For simplicity, in fig. 4 shows only two cells Chi m and two SHE 1 2, shown in fig. 1. Cell X is the serving cell for UE 1 and it is interfered with by UE 2 on the uplink channel. Cell U is the serving cell for UE 2 and it is obstructed by UE 1 on the uplink communication channel.

SOE 1 may have data to link to its serving cell X and may send a resource request. The resource request can indicate the priority of the request, the volume of data for the link from CE 1, etc. In one project, which is not shown in fig. 4, UE 1 does not send a 5РІІІІ request to cell В, which is affected by interference. For this design, cell U exposed to interference can send 5EI to the UE if cell U determines that the desired spatial suppression of interference by the UE is 1. In another design, which is shown in FIG. 4, CE 1 may send a 5PRI request to the interfering cell U to request cell U to identify and send 5PRI to CE 1. CE 1 may also send a reference signal along with the resource request to allow each cell to determine information for spatial zeroing or pre-encoding information for SHE 1.

Serving cell X can receive a resource request from UE 1 and, possibly, a 5RY request from UE 2.

Cell X can send a reference signal request to UE 1 to request UE 1 to transmit a reference signal

HOWLING Cell X may also determine the pre-coding information (for example, SOI or PMI) for SHE 1 and may send the pre-coding information to SHE 1 (not shown in Fig. 4).

Cell U can receive a 5PRI request from UE 1, determine the 5PRI based on the uplink transmission from RU 1, and send 5PRI to RU 1. If RU 1 is equipped with a single transmit antenna, 5REI may contain information about the gain for zero reception and/or other information for ESR 1. If ESR 1 is equipped with multiple transmit antennas, then the 5REI may contain information for spatial zeroing (eg, SOI or RMI for cell U) to allow ESR 1 to direct its transmission away from cell U.

UE 1 can receive a reference signal request from its serving cell X, 5RI from an interfering cell Y, and possibly pre-coding information from serving cell X. If UE 1 is equipped with a single transmit antenna, UE 1 can determine the power level when transmitting Raaa, i to use it for data transmission, based on the gain to zero when received from cell Y, the target level of interference for cell M and/or other information If the UE 1 is equipped with multiple transmit antennas, the UE 1 can determine the matrix Precoding R to use it to transmit data based on the precoding information from cell X and the spatial zeroing information from cell M. UE 1 can then transmit a reference signal

VOI at the level of transmission R.di-»ie,1, and possibly with the matrix Pi of pre-coding. R'di-v,1: May be equivalent to Razia, y or a scaled version of Raaa, 1.

The serving cell X can receive the reference signals of the ROI from UE 1 and CE 2. The cell X can determine the channel quality for the UE 1 based on the reference signals of the VO, and can select MO5 for the UE 1 based on the channel quality. Cell X may generate an uplink grant, which may contain the selected MO5, assigned resources, transmit power level for use of assigned resources, and/or other information. Cell X can send an uplink grant to

UE 1. UE 1 can accept the provision of an uplink, process the data according to the selected MSO5 and perform data transmission on the assigned resources. Cell X can receive the data transmission from UE 1, decode the received transmission, determine the ACS confirmation information based on the decoding result, and send the ACS information to the UE 1.

In the project shown in fig. 2, the RIA request can be sent in the NI subframe via the downlink channel,

The SRI can be sent in the subframe Y2 on the uplink channel, the OVI request and the OBJ reference signal can be sent in the subframe IZ on the downlink channel, the OVI can be sent in the subframe 14 on the uplink channel, the downlink grant and data can be sent in subframe 15 on downlink and ASK information can be sent in subframe Ib on the uplink. Subframes H, 12, 13, 14, 15, and 16 may be divided into the same or different number of subframes, for example, two to four subframes between consecutive subframes used for transmission. In one project, subframes M, IZ and

Я5 in the downlink can belong to one downlink sequence, which can contain downlink subframes spaced by | subframes, where Y can be any acceptable value. Subframes 12, 14, and 16 may belong to a single uplink sequence, which may contain uplink subframes separated by I subframes.

In the project shown in fig. 4, the resource request and the 5PRI request can be sent in the subframe YI on the uplink channel, the ZERO and the reference signal request can be sent in the subframe Y2 on the downlink channel, the reference signal VNOI can be sent in the IZ subframe on the uplink channel, the provision of the uplink channel can be sent in subframe i4 on the downlink, data can be sent in subframe i5 on the uplink and ASK information can be sent in subframe Ib on the downlink. Subframes 1, 12, 13, 14, 15 and 16 can be divided into the same or different number of subframes. In one design, the subframes IN, IZ, and I5 in the uplink may belong to the same turn in the uplink, and the subframes 12, 14, and 16 in the downlink may belong to the same turn in the downlink.

In the same project, resources for message and data transfer can be implicitly transferred.

For example, in fig. 2 5RI request can ask for 5RI specific data resources, BOI request can ask for HER specific data resources, etc. In another design, resources used for message links, resources used for reference signals, and resources used for reference transmission data, may be implicitly transmitted. For example, in fig. 2 request 5PRI can be sent on the resources of Vchy-ted of the downlink channel and can ask for 5VRY resources Weight for the data of the downlink channel, which can be associated with Vchy-ed. The BOI reference signals of all cells corresponding to the same data resources may overlap with the NAZ, so that the ESAs can measure the total interference observed by these ESAs from all cells. 5EI may be referenced via uplink B5ORI resources, which may be associated with downlink Vzi-head resources used to reference the ORI request, or may be explicitly specified in the ORI request. A VOI request may be sent over Vdi-eed downlink resources and may request VOI for Nkdi-x downlink resources that may be associated with Ndi-ed. The VOI may be determined based on the reference signal VO sent via the downlink Rd-e resources and may be sent via the Vcoi uplink resources of the ROI, which may be associated with the downlink VNdi-led or may be explicitly specified in the VOI request . The reference signal of the INNOI can be sent over the resources of the downlink channel and can transmit the precoding matrix and the transmission power level to be used on the resources of the downlink data transmission leg.

Spatial jamming messages and transmissions can contain different types of information. For example, messages and transmissions for spatial downlink interference suppression may contain the information described below.

In one project, a 5RYI request sent to the SHE may contain one or more of the following:

Each interfering cell, to which the OE must send 5BRI,

Frequency and time resources to determine 5BRI,

Uplink resources for use when referring to 5РЙ,

The priority of the request is 5BRY,

Target interference level, and/or

Other information.

Interfering cells can be identified based on measurement reports of the pilot signal sent by the CE to the serving cell. In one design, each interfering cell may be identified by a short cell identifier (CI), such as 2-3 bits for each interfering cell, to reduce the amount of service signaling. Another design may use a bit matrix for a set of interfering cells to be reported via ESR, and each interfering cell may be associated with a bit in the bit matrix. The number of interfering cells can be limited (for example, six cells) to reduce the volume of service signaling. The number of interfering cells may also be limited to cells with a received power within a given value (for example, within 10 dB) of the receiving power of the serving cell. The SHE can send 5RS to each interfering cell specified in the RS request.

Frequency and time resources, by which 5РЙ should be determined, can be all or part of the bandwidth of the system, for example, a subband, one or more resource blocks, etc.

Resources can be explicitly specified in the RI request (for example, by means of a resource index) or be transferred implicitly (for example, associated with the resources referred to by the 5RI request).

The priority of a 5PRI request can be determined based on various factors. In one project, the priority can be determined based on the medium-long-term service function. The priority may also contain a short-term priority differential. The priority can be quantized by several values (for example, 1-2 bits) to reduce the volume of service signaling. In one project, the priority can be determined by the type of data to be sent, such as best effort (BE), guaranteed dispatch (AK), urgent dispatch (ER), etc.

In one project, the ORI for the interfering cell may contain one or more of the following:

Information for spatial zeroing, for example, SOI or RMI for the interfering cell, SO or RMI for the serving cell, etc.,

The gain factor for nulling when transmitting and/or the gain factor for nulling when receiving,

Frequency and time resources to suppress the interference created by the interfering cell,

The target level of obstacles for ESR,

The priority of the request to suppress the interference created by the interfering cell,

Type of feedback information, and/or

Other information.

The SOI or RMI for the interfering cell and the SOI or RMI for the serving cell can be determined as described above. The SORMMI for each cell can be provided with sufficient resolution (e.g. 8-10 bits) to achieve the desired zeroing characteristics during transmission. The serving cell can ask the UE to send SOI/RMI for the interfering cell and

SOI/RMI for the serving cell at the same time to allow accurate scheduling coordination between different cells. The gain factor for nulling during transmission and/or reception may also be determined and reported as described above.

Frequency and time resources that can be explicitly indicated by means of 5EI (for example, resource index) or implicitly transferred (for example, related to resources to which EI is referred) to reduce interference. The frequency and time resources may span a single subband in a single subframe, multiple subbands in a single subframe, a subband for multiple subframes, or some other frequency-time dimension. The priority for 5EI can be equal to the priority in the 5EI request. In wideband deployments (eg bandwidths greater than 5 MHz), a separate 5RPI may be sent for each portion (eg 5 MHz) of the bandwidth to reduce the feedback payload. The type of feedback information may indicate whether the 5E1(s) contains an SOE corresponding to the channel between the interfering cell and the ESR and (its) RMI that can be used by the serving cell for the ESR. One or both types of information may be useful for making a scheduling decision in the interfering cell.

In one design, a VO request) sent to the ESR may contain one or more of the following: frequency and time resources to determine the COI, uplink resources to be used for the VO link, priority of the VO request, and/or other information.

In one design, the reference signal VOY may be transmitted by the cell in the assigned resources in subframe 3 and may transmit the precoding matrix and transmission power level likely to be used on the corresponding resources in subframe 15-Y3-4A, where A may be a fixed offset . The level of transmission power in the corresponding resources may be the same or different from the level of transmission power transmitted in the reference signal of the Swarm, for example, depending on Oo5, channel quality conditions, etc. In one project, all cells can transmit their reference signals of the Swarm on the same resources and may use different scrambling for a particular cell. This may allow the UE to measure the desired signal component from the serving cell and the interference from the interfering cells based on the different scrambling codes for those cells. Signaling reference signals can allow accurate measurement of channel states for a specific resource with a relatively small volume of service signaling. The volume of service signaling may depend on the desired modularity of resources.

In one project, the transmission of ROY from the UE to the serving cell may contain the channel quality of frequency and time resources, explicitly or implicitly specified in the request of the ROY. A BOI may contain a quantized channel quality (e.g., four or more bits) for each at least one layer that is to be used to transmit data to the UE. Each level may correspond to a spatial channel in the MIMO channel from the serving cell to the SHE. The VIO may also contain the quantized channel quality for the base layer and the differential value for each additional layer. The INV may also contain a rank indicator (RI) (eg, one or two bits) to indicate the number of levels that should be used for data transmission.

Messages and transmissions for spatial interference suppression on the uplink communication channel may contain (i) information similar to the information described above for spatial interference suppression on the downlink channel and/or (ii) other information.

In one project, SHE can send EI! (or VOI to a control segment that may be freed from other transmissions. For example, cell X may reserve a control segment for ESO in cell Y and possibly other cells to send 5ROI and/or VOI to cell X. 5РІ or ВОІ per cell, using BOTH or Мххх5О-ЕОМА.

In one design, messages and transmissions for spatial suppression of interference can be selected additionally to reduce the volume of service signaling. For example, the sequence of messages and transmissions shown in fig. 2, may be invoked once in each scheduling interval and scheduling decisions (eg, selected precoding matrices and transmission power levels) may be valid for the entire scheduling interval. The scheduling interval may span M subframes in one turn or some other suitable duration. Each alternation can contain subframes spaced by | subframes The scheduling intervals for different queues can be staggered in time to avoid the long initial delay caused by extra sampling. In another design for persistent scheduling, a message may contain a duration bit to indicate that it is valid for a long period of time.

The messages and transmissions shown in fig. 2 and 4, can refer through different channels. For example, in I TE systems, a cell can send 5RPI and BOI requests over the downlink physical control channel (PCC) to the SHE. In one design, a cell may send a 5RI request or a VIA request using an existing downlink control information (DLCI) format, for example, with different scrambling for cyclic redundancy check (CAC) to distinguish a 5RI or VIA request from other types of messages. In another design, a cell can send a 5RPI request or a NOI request using the new OSI format. A cell can send multiple 5EBI or BOI requests jointly in the space corresponding to one ROSSN using different SVOs. The cell can also transfer the provision of the downlink via ROSSN to the planned SOE. A cell can transmit data over a physical downlink (PDL), which is shared in one or more NAC transmissions.

The cell can also transmit the assigned reference signals on the ROBSN to the planned OEs.

The SOE can send 5РІ, VOI and/or АСК information on (i) a physical uplink control channel (РОССН), if only control information is sent, or (и) a shared physical uplink channel (РОСН), if both data and information are sent management. ORIs and VOIs can thus be sent in-band if data is also sent. ROSSN can carry up to 12 bits of information on two resource blocks (RBBs) in one subframe. These 12 bits of information can be coded with a (20, 12) block code to obtain 20 code bits that can be further processed and sent on two BBs. In one design, an increased payload of C bits (for example, 13-16 bits) for 5EII can be sent over ROSSN with a higher code frequency, for example, with a (20, 0) code frequency, where O can be greater than 12. In another the project increased payload can be sent using the new ROSSN format. The payload can be encoded with a convolutional code or a Reed-Muller code and sent over two half-AVs. Each half BB can cover six subcarriers in one time slot of six or seven symbol periods and can contain a reference signal in the central two-symbol period of the time slot. In yet another design, the enhanced payload can be split into multiple parts and each part can be sent using the existing ROSSN format. Multiple parts can be sent on different sets of subcarriers in the same subframe using MXx5C-EOMA or in different subframes to allow the use of higher transmission power for each part. Various messages and transmissions shown in fig. 2 and 4, can also be sent over other data and/or control channels.

The interference suppression methods described here can increase the dimensionality on the downlink as well as on the uplink. The methods can provide a significant gain in unplanned deployment (for example, to extend coverage), limited communication scenarios, and other scenarios. The techniques may be particularly advantageous in scenarios with multiple served EBs, experiencing high interference from multiple neighboring cells (eg, femtorolling) and in scenarios with pulsating traffic.

The methods described here can also be used for cross-site packet sharing (IP5) and shared silence (C5). For IRO, multiple cells (of the same or different eMV nodes) can send a packet to a single UE. Each cell can send its data transmission to the ESR based on the precoding information defined by the ESR for that cell. For IRO, each cell, except the serving cell, can control its transmission in the direction of the UE (instead of the direction from the UE) based on the precoding information from the UE. For C5, the interfering cell may reduce its transmit power (perhaps to zero) to reduce interference to the UE in the neighboring cell. The interfering cell can decide whether to direct the transmission away from the OE or simply reduce the transmission power.

In fig. 5 shows a draft process 500 of the sequence of operations during data transmission with spatial suppression of interference in a wireless communication network. Process 500 may be performed by a first station, which may be a downlink cell, an uplink CE, or some other entity.

The first station (for example, a cell) can receive P! from a second station (eg, subject to ESR interference) that is not in communication with the first station (block 512). The second station may send a 5RPI to the first station in response to a 5RPI request, which may be sent to the second station by the serving cell of the second station or the first station. The first station may also send a request

ORI of a third station (for example, a served ESR) that can identify and send 5EIs to one or more other interfering stations. 5EI can thus be sent upon inquiry or upon request. The first station may receive pre-coding information (eg, SOI or RMI) from the third station (block 514). The first station may direct the third station's data transmission based on the precoding information and the 5RI to reduce interference for the second station (block 516).

In one project, Z5RYI may contain information for spatial zeroing (for example, SOI or

RMI) for the first station. The first station may then send a data transmission based on the spatial null information to direct the data transmission away from the second station. For example, the first station can select a precoding matrix based on the 5RPI from the second station and the precoding information from the third station. The first station can then forward the data transmission based on the precoding matrix to the third station.

In another design, the ZE may contain information for spatial nulling and a gain for nulling during transmission, showing the suppression of interference at the second station due to the use of information for spatial nulling by the first station. The first station can determine the transmission power level based on the gain to zero when transmitting and can send a data transmission with a certain transmission power level. In yet another design, the Z5EI may include a receive null gain that shows the suppression of interference at the second station due to the use of spatial processing for the receiver by the second station. The first station can determine the transmission power level based on the gain to zero when receiving and can send a data transmission with a certain transmission power level.

For downlink data transmission, a first station may contain a serving cell, a second station may contain an UE that is subject to interference, and a third station may contain a served UE. The serving cell can receive 5PRI directly from the UE exposed to interference. Alternatively, the serving cell can receive 5EI indirectly from

ESR exposed to interference through another cell. For uplink data transmission, the first station may contain an ESR, the second station may contain a cell exposed to interference, and a third station may contain a serving cell for the ESR.

In fig. 6 shows a design of a device 600 for transmitting data with spatial interference suppression. The device 600 includes a module 612 for receiving at the first station a 5ERI sent by a second station that has no connection with the first station, a module 614 for receiving pre-coding information from a third station, and a module 616 for linking data transmission from the first station to the third station on based on the pre-coding information and 5RPI to reduce the interference for the second station.

In fig. 7 shows a process design 700 for receiving data with spatial interference suppression in a wireless communication network. Process 700 may be performed by a first station, which may be a downlink CE, an uplink cell, or some other entity.

The first station (for example, the UE) may accept the 5PRI request to send a 5PRI for a second station (eg, an interfering cell) that does not have a connection with the first station (block 712). In one design, a 5EI request may be sent by a third station (for example, a serving cell) that is in communication with the first station. In another project, a 5EI request can be sent by a second station. In any case, in response to the 5RPI request, the first station may determine the 5RPI for the second station (block 714). The first station may send the 5EI to the second station or to the third station, which may send the EI to the second station (block 716). The first station may also determine the precoding information (eg, SOI or RMI) for the third station (block 718) and may send the precoding information to the third station (block 720). The first station may then accept the data transmission sent by the third station based on the pre-coding information (block 722). The first station may also receive a transmission sent by the second station to another station based on the 5RPI to reduce interference to the first station (block 724).

In one project, the 5RPI may contain information for spatial zeroing. The first station can determine the characteristic of the channel from the second station to the first station. The first station may then select a precoding matrix from the codebook of precoding matrices based on the channel characteristics to reduce interference to the first station. The spatial zeroing information may contain the selected precoding matrix, SOI or PMI for the second station, SOI or PMI for the third station, etc. In any case, the second station may send its transmission based on the spatial zeroing information to direct the transmission away from the first station.

In another design, the ZR may contain information for spatial zeroing and the gain factor for transmission zeroing. The second station can then send its transmission with a transmission power level determined based on the gain to zero when transmitting. In yet another design, 5EI may contain a gain factor for nulling during reception. The second station can then send its transmission with a transmit power level determined based on the gain to null on reception.

For downlink data transmission, the first station may contain the OE, the second station may contain the interfering cell and the third station may contain the serving cell for the CE. OE can send 5EI directly to the interfering cell. Alternatively, the UE can send 5PRI to the serving cell, which can send 5PRI to the interfering cell. For uplink data transmission on the communication channel, the first station may contain a cell, the second station may contain an interfering SE and the third station may contain a SE served by the cell.

In fig. 8 shows a design of a device 800 for receiving data with spatial interference suppression. The device 800 includes a module 812 for receiving at the first station a request for 5PRI to send

ZONE to a second station not connected to the first station, module 814 to determine the 5BR for the second station, module 816 to refer the 5BR, for example, to the second station, module 818 to determine the precoding information for the third station, module 820 for link pre-coding information of the third station, module 822 for receiving a data transmission sent by the third station to the first station based on the pre-coding information, and module 824 for receiving a transmission sent by the second station of the other station based on the RIA to reduce interference for the first station.

Modules shown in fig. b and 8, may contain processors, electronic devices, hardware devices, electronic components, logic circuits, memory devices, system programs, firmware control programs, etc., or any combination thereof.

In fig. 9 shows a block diagram of the project of the base station/eMV 110 and OE 120, which can be the base station "eMmV or SHE shown in Fig. 1. The base station 110 can be equipped with transmitting antennas T 934a-934i, and the OE 120 can be equipped with receiving antennas B 952a-952g, where, of course, T21 and 21.

At base station 110, transmission processor 920 may receive data from data source 912 and messages from controller/processor 940. For example, controller/processor 940 may provide messages for spatial interference suppression shown in FIG. 2 and 4. The transmission processor 920 can process (eg, encode, interleave and display symbols), data and messages and provide data symbols and control symbols, respectively. The transmission processor 920 may also generate reference links for the NOI reference signal and/or other reference signals or pilot signals. The transmission multiple-input-multiple-output (MIMO) processor 930 may perform spatial processing (eg, pre-encoding) of data symbols, control symbols, and/or reference symbols, as needed, and may provide streams of output T transmission symbols to transmission modulators T (MY) 932a-9321. Each modulator 932 can process a corresponding output stream of symbols (eg, for OBM, etc.) to obtain an output stream of samples. Each modulator 932 may further process (eg, convert to analog form, amplify, filter, and up-convert) the output sample stream to provide a downlink signal. Signals T downlink from modulators 932a-9321 can be transmitted, respectively, through transmission antennas T 934a-9341.

On SHE 120, antennas 952a-952g can receive downlink signals from the base station 110 and can send the received signals to demodulators (EMOs) 954a-954i, respectively. Each demodulator 954 may shape (eg, filter, amplify, down-convert, and digitize) a corresponding received signal to obtain input samples. Each demodulator 954 may further process the input samples (eg, for OROM, etc.) to obtain the received symbols. The MIMO detector 956 can receive the received symbols from all A demodulators 954a-954i, perform MIMO detection for the received symbols, if possible, and provide the detected symbols. The receiver processor 958 may process (eg, demodulate, deinterleave, and decode) the detected symbols, provide the decoded data for the ESR 120 to the data receiver 960 , and provide the decoded message to the controller/processors 980 .

On the uplink in the SHE 120, the transmission processor 964 may receive and process data coming from the data source 962 and messages (eg, for spatial interference suppression) from the controller/processor 980. The transmission processor 964 may also generate reference symbols for the reference signal VO and/or other reference signals or pilot signals. The symbols from the transmission processor 964 can be pre-coded by the TX MIMO processor 966, if necessary, additionally processed by modulators 954a-954g and transmitted to the base station 110. At the base station 110, the uplink signals from the SHE 120 can be received by antennas 934, processed by demodulators 932, detected by MIMO detector 936, if necessary, and further processed by receive processor 938 to obtain decoded data and messages transmitted from OE 120.

Controllers/processors 940 and 980 can control the operation of the base station 110 and OE 120, respectively. The processor 940 and/or other processors and modules in the base station 110 may perform or control the process 500 shown in FIG. 5, the process 700 shown in FIG. 7, and/or other processes for the methods described here. Processor 980 and/or other processors and modules on CE 120 may execute or control process 500 , process 700 , and/or other processes for the methods described herein. Memory devices 942 and 982 can store data and control programs for the base station 110 and OE 120, respectively. The scheduler 944 may schedule UEs for downlink and/or uplink data transmission and may provide resources for scheduled

ABOUT.

Those skilled in the art should understand that information and signals can be presented using any of a number of different technologies and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and elementary signals that may be mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any what combination of them.

Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations thereof. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits and steps have been described above, generally, in terms of their functionality. Whether such functionality is implemented as hardware or as software depends on the specific application and design constraints imposed on the entire system. Those skilled in the art may implement the described functionality in various ways for each particular application, but such implementation decisions should not be construed as deviating from the scope of this disclosure.

Various illustrative logic blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, digital signal processor (DSP), specialized integrated circuit (ABIS), user programmable gate array (PSA). or other programmable logic device, discrete diode or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, as a combination of a CPU and a microprocessor, a plurality of microprocessors, one or more microprocessors with an O5R core, or as any other such configuration.

The steps of the method or algorithm described in connection with the disclosure herein may be implemented directly in hardware, in a software module executed by a processor, or in a combination thereof. A program module can be permanently located in random access memory (RAM), flash memory, non-volatile memory (VOM), erasable programmable non-volatile memory (EPROM), electrically programmable erasable non-volatile memory ( EERVOM), registers, hard disk, removable disk, SO-VOM or any other form of data carrier known in the art.

For example, the data carrier is connected to the processor in such a way that the processor can read information and write information on the data carrier. Alternatively, the data carrier may be an integral part of the processor. The processor and the data carrier can be permanently located in the ABIS. ABIS can be permanently located on the user terminal. Alternatively, the processor and data carrier may be permanently present as discrete components on the user terminal.

In one or more example designs, the functions described may be implemented in hardware, software, embedded software, or any combination thereof. When implemented in software, functions may be stored or transmitted as one or more commands or control programs on a computer-readable medium. Computer-readable media include both computer storage devices and data transmission media, including any transmission medium that facilitates the transfer of a computer program from one location to another. Data carriers can be any available media that can be accessed by a universal or special computer. By way of example only, but not by way of limitation, such computer-readable media may include YOU,

VOM, EERVOM, CO-VOM, or other optical disk drive, magnetic storage device, or any other data transfer medium that can be used to carry or store desired program controls in the form of commands or data structures and that can be accessed universal or specialized computer, or universal or specialized processor. In addition, any connection is properly called a computer-readable media. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (051), or wireless technologies such as infrared radiation, radio waves, and microwave waves, then coaxial cable, fiber optic cable, twisted pair, PERSONAL or wireless technologies such as infrared radiation, radio waves and

Microwaves are considered to be within the definition of a data transmission medium. A disc, as the definition is used here, includes a compact disc (CD), laser disc, optical disc, digital universal disc (DVD), floppy disk, and DVD disc, where some discs (CDs) typically reproduce data magnetically and others disks (disks) reproduce data optically using lasers. Combinations of the above must also be contained in a volume of computer-readable media.

The foregoing description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure should be readily apparent to those skilled in the art, and the underlying principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but rather should be presented in the broadest scope consistent with the principles and novel features disclosed herein. syueeeefu GOD'S PEC DEMY PIMKEH. pchetfvk: Zhkizhoyuchch yucca I ate. in TSI I eat them

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