Probe feedback using shortened frame structure

Abstract

The present invention relates to sounding feedback using a shortened frame structure, wherein a transceiver, method, and storage medium are provided. The transceiver is configured to transmit or receive data within at least one transmission time interval on a determined allocated resource element of a wireless communication system. The transceiver is configured to at least partially blank a time interval to be transmitted. The transceiver is configured to receive a transmission authorization from another transceiver in a blanked portion of the at least partially blanked transmission time interval. The transceiver is configured to receive data using a data signal, the data signal including a plurality of frames, each frame including a plurality of subframes, and each subframe including a plurality of symbols in the time domain and a plurality of subcarriers in the frequency domain. The transmission time interval is defined by a predefined number of symbols in the time domain.

Description

[0001] This application is a divisional application of the invention patent application entitled “Detection Feedback Using Shortened Frame Structure” with application number 201780063003.1 filed on August 4, 2017. Technical Field

[0002] The present invention relates to the field of wireless communication systems, such as wireless mobile communication systems, in which data is transmitted from a transmitter to one or more receivers, such as mobile terminals. The transmitter may be a base station or other mobile terminal in the wireless communication system. The receiver may be a base station or other mobile terminal in the wireless communication system. If the transmitter and receiver are mobile terminals, the communication link is called a sidelink. Background Art

[0003] Advanced MIMO systems with many antenna interfaces, such as full-size (FD)-MIMO or massive MIMO systems, require fast and efficient feedback mechanisms to characterize the radio channel between the base station (eNB) and user equipment (UE or uE). So-called channel state information (CSI) is used to select the optimal transmission strategy. Special sounding reference signals (SRS) can be used to estimate the channel quality of links (uplink, downlink, and sublink) over wider bandwidths. As the number of antenna ports increases, e.g., to [16, 32, 64, >100] antenna ports, the number of resource elements (REs) used to transmit feedback symbols increases, resulting in a larger overhead for symbols used to transmit control traffic compared to symbols that could be used to transmit data symbols. Consequently, the overhead-to-data ratio worsens with the increase in the number of antenna ports. Furthermore, accurate beamforming requires fast feedback in the reverse link (e.g., the uplink (UL) or sublink of a communication system) so that the channel state information collected from a specific UE remains "valid," meaning that signaling can be performed within the coherence time of the fading radio channel. In current frequency division duplex (FDD) systems, it is not possible to exploit channel reciprocity (using the same frequency band in the UL direction and deriving CSI from the reciprocal link) to derive CSI for the downlink (DL). Therefore, the UE must calculate the CSI from the DL transmission and feed this information back in the UL direction. This requires the UE to store this feedback information (memory requirements) and wait for an uplink timeslot (uplink grant) to transmit the CSI feedback in the UL. In TDD systems, the DL and UL subframe configurations are restricted to a specified pattern, including subframes for switching (S) between DL and UL. Current TDD configurations restrict channel feedback to the available reverse link (e.g., UL) timeslots, which can result in outdated CSI at the transmitter waiting for CSI for precoding.

[0004] In summary, in FDD and TDD systems, current mechanisms can result in feedback delays, causing outdated feedback at the transmitter (e.g., a base station in DL or a terminal in sidelink communications). If the channel changes during this period, such as within the coherence bandwidth of a fading channel, the transmitter cannot use the feedback. Transmitting with outdated CSI precoding will result in inefficient or even lost packets in data transmission and may lead to increased overhead, such as caused by resource elements used for retransmission protocols such as hybrid automatic repeat request (HARQ).

[0005] The LTE Sounding Reference Symbol (SRS) is a reference signal transmitted by the UE and used by the corresponding base station (eNB) to assess the uplink timing transmission and the channel quality of the uplink path, see 3GPP TS 36.211-§5.5.3[1]. The UE sounding procedure is defined in 3GPP TS 36.213-§8.2[2]. The UE shall send Sounding Reference Symbols (SRS) on each serving cell SRS resource based on two different trigger types: higher layer signaling or based on a specific DCI format for FDD or TDD systems. SRS can be sent as "single" or "periodic" information. The period ranges from 2 ms to 320 ms. In addition, the used SRS bandwidth, frequency hopping bandwidth, frequency domain location of SRS, and cyclic shift can produce up to 8 different, orthogonal SRS sequences. In addition, a "transmission comb" can be specified, which allows two UEs to be multiplexed with the same cyclic shift on alternating frequency and time resources.

[0006] The SRS sequence uses the same sequence as the uplink demodulation reference signal (DMRS). Since the cyclic shift versions of the Zadoff-Chu sequence are orthogonal, several UEs (up to 8) can transmit using different cyclic shifts on the same physical radio resources.

[0007] The sounding reference signal should be transmitted in the last symbol of the uplink subframe. Figure 1 An example is shown in .

[0008] In detail, Figure 1 Figure 1 is a schematic diagram of an uplink subframe (SF) of an LTE resource grid. Therefore, the vertical axis represents the frequency domain and the horizontal axis represents the time domain. Figure 1As shown, the time domain is subdivided into subframes 10_0 to 10_9 (SF0 to SF9), each subframe 10_0 contains two time slots 12_0 and 12_1, and each time slot contains 7 symbols 14_0 to 14_6. The frequency domain is subdivided into physical resource blocks 16_0 to 16_5 (PRB0 to PRB5), and each physical resource block 16_0 includes 12 subcarriers 18_0 to 18_11. Therefore, a resource element is defined by one symbol and one subcarrier. Figure 1 As shown, the sounding reference symbols 20_0 to 20_4 may be transmitted in the last symbol of subframes SF1, SF3, SF, SF7, and SF9 in the physical resource blocks PRB1 to PRB4.

[0009] in other words, Figure 1 A graphical view of SRS (highlighted resource elements 20_0 to 20_4) in one uplink radio frame (10 ms, 1.4 MHz bandwidth) [3] is shown.

[0010] In TDD (see also the LTE radio frame structure described below), SRS can be transmitted in the uplink as well as in a special subframe (UpPTS). Based on the special subframe structure (Table 4.2-1 from 36.211), the UpPTS length varies (one or two OFDM symbols). When there is one single carrier-FDMA (SC-FDMA) symbol in the UpPTS, it can be used for SRS transmission. When there are two SC-FDMA symbols in the UpPTS, both can be used for SRS transmission and can be assigned to the same UE. In the UpPTS, when the SRS transmission instance overlaps with the physical random access channel (PRACH) region used for preamble format 4, the UE should not send SRS.

[0011] Then, the LTE radio frame structure is introduced. In LTE Release 13 and earlier versions, the subframe is equal to the system's Transmission Time Interval (TTI), which is 1ms. Figure 2 This standard currently supports three types of frame structures.

[0012] In detail, Figure 2 Figure 2 is a schematic diagram of the LTE-type 1FDD frame structure in the time domain. A radio frame 20 has a duration of 10 milliseconds and is subdivided into 10 subframes 10_0 to 10_9. Each subframe 10_0 is subdivided into two time slots 12_0 and 12_1, each of which has a duration of 0.5 ms.

[0013] That is to say, Figure 2 Shown are subframes within the LTE frame structure type 1 (FDD), see 3GPP TS 36.211.

[0014] Figure 3Schematic diagram of the LTE-type 2TDD frame structure in the time domain (timing of the transmission time interval (TTI) structure). Therefore, the vertical axis represents different uplink / downlink configurations and the horizontal axis represents the time domain. Figure 3 In FIG, two radio frames 10_0 and 10_1 (SFN(N) and SFN(N+1)) are shown, and each subframe 10_0 contains 10 subframes (where SFN indicates the subframe number). The downlink time slot is denoted by D, the uplink time slot is denoted by U, and the switching point is denoted by S. In addition, Figure 3 A guard 22 between downlink time slots and uplink time slots is shown in FIG.

[0015] in other words, Figure 3 LTE TDD mode (UL / DL configuration) with switching period (guard) is shown.

[0016] In LTE Type 3, an aggregated frame structure is used, consisting of a collection of Type 1 and / or Type 2 frame structures, utilizing a licensed shared access scheme (LAA) suitable for LAA secondary unit operation with a normal cyclic prefix. Summary of the Invention

[0017] It is an object of the present invention to provide a method that improves the efficiency and latency of a feedback mechanism allowing characterization of a radio channel in a wireless communication system.

[0018] This object is achieved by the subject matter defined in the independent claims.

[0019] Embodiments are defined in the dependent claims.

[0020] An embodiment provides a transceiver, wherein the transceiver is configured to transmit or receive data in at least one transmission time interval on a determined allocated resource element of a wireless communication system, wherein the transceiver is configured to at least partially blank the transmission time interval for a data block to be transmitted or received by the transmitter, wherein the transceiver is configured to (a) signal a transmission authorization in a blanked portion of the at least partially blanked transmission time interval to other transceivers, or (b) at least partially blank the transmission time interval based on a blanking pattern received from the other transceivers.

[0021] For example, (part of) the transmission time interval can be used to embed reference signals (such as sounding reference signals (SRS)) in the downlink (DL), uplink (UL) or sidelink (SL) directions, as well as in the mutual transmission of UL SRS within the DL frequency band, such as for channel state information (CSI) precoding in the frequency division duplex (FDD) band.

[0022] In an embodiment, the transceiver may be a first type of transceiver, such as a base station (eNB) of a wireless communication system. Alternatively, the transceiver may also be a mobile terminal (UE) or a secondary link device of the wireless communication system.

[0023] In an embodiment, a transceiver may be configured to transmit or receive data using a data signal, the data signal comprising a plurality of frames, each frame comprising a plurality of subframes, and each subframe having a plurality of symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein a transmission time interval may be defined by a predefined number of symbols in the time domain.

[0024] Therefore, the transmission time interval may be shorter than one subframe (eg, two time slots).

[0025] In an embodiment, the transceiver may be configured to at least partially blank the transmission time interval by blanking at least a subset of the time domain symbols of the transmission time interval.

[0026] In an embodiment, the transceiver may be configured to at least partially blank the transmission time interval by blanking at least a subset of subcarriers in the frequency domain of the transmission time interval.

[0027] In an embodiment, the transceiver may be configured to at least partially blank the transmission time interval by blanking at least a subset of resource elements of the transmission time interval in at least one of the time domain and the frequency domain.

[0028] For example, transmission time interval blanking can be performed in the time domain down to the symbol level, in the frequency domain at the subcarrier or physical resource block level, or in any combination of the time, frequency, and space domains.

[0029] In an embodiment, the transceiver may be configured to signal to the other transceivers a transmission grant for sending the reference signal in a blanking portion of the at least partially blanked transmission time interval.

[0030] For example, the transceiver can be configured to signal the transmission of a reference signal (e.g., an SRS sequence) by other transceivers in the area (e.g., uE or mobile devices). Therefore, it is not necessary to signal blanking in the downlink because the transceiver (e.g., eNB or base station) may just leave this gap.

[0031] For example, a transceiver may be configured to signal a blanking grid to other transceivers, where the other transceivers may decide whether to send a reference signal (e.g., an uplink sounding reference signal (SRS)) in the blanking portion of a transmission time interval based on the signaled blanking grid.

[0032] In an embodiment, the transceiver may be configured to use a downlink control channel to signal the transmission grant.

[0033] For example, a transceiver (eg, a base station) may be configured to perform DL signaling of the blanking pattern to other transceivers (eg, uEs) using signaling on a DL control channel (eg, PDCCH).

[0034] In an embodiment, the transceiver may be configured to blank at least one of the demodulation reference symbols and the data symbols in the at least partially blanked transmission time interval.

[0035] For example, in a specific transmission time interval in the time domain and the frequency domain, the transceiver may not send demodulation reference symbols (DRMS) and data symbols.

[0036] In an embodiment, the transceiver may be configured to blank all symbols of a transmission time interval.

[0037] For example, the transceiver may be configured to perform complete blanking of the transmission time interval in at least one of the frequency domain and the time domain, eg, in both the frequency domain and the time domain.

[0038] In an embodiment, the transceiver may be configured to transmit only at least one of reference symbols and demodulation reference symbols in the at least partially blanked transmission time interval.

[0039] Thus, the transceiver may be configured to not transmit at least one of a data symbol and a control symbol during the at least partially blanked transmission time interval.

[0040] For example, the transceiver can be configured to perform data and control channel blanking. Only reference symbols (RS) can be sent, and resource elements (REs) used for data or control channels can be left empty to reduce interference, or left to each uE, optionally for decoding RS / DMRS symbols.

[0041] In an embodiment, the transceiver may be configured to partially blank portions of the transmission time interval in at least one of the time domain and the frequency domain.

[0042] For example, the transceiver may be configured to partially blank portions of the transmission time interval in the time domain, partially blank portions of the transmission time interval in the frequency domain, or perform a combination of both.

[0043] In an embodiment, the transceiver may be configured to use a blanking portion of the at least partially blanked transmission time interval for sending or receiving a reference signal.

[0044] For example, a reference signal (eg, pilot symbol or reference symbol) may be specified to enable a transceiver (eg, a base station) or another transceiver (eg, a mobile device) to estimate a channel. Thus, both transceivers may be aware of the reference signal.

[0045] The transceiver may be configured to at least partially blank a transmission time interval for a data block to be sent by the transceiver in a downlink frequency band or during a downlink time interval of a wireless communication system, wherein the transceiver may be configured to use a blanked portion of the at least partially blanked transmission time interval for receiving a reference signal from another transceiver in the downlink frequency band or during the downlink time interval of the wireless communication system.

[0046] The transceiver may be configured to blank at least one of the data channel and the control channel within a transmission time interval, wherein the transceiver may be configured to use the blanking channel of the transmission time interval to send the reference signal to other transceivers.

[0047] For example, additional reference signals may be embedded in downlink control and / or data channels to support other transceivers (eg, uE) in performing channel estimation for a larger set of transmit antennas in a shorter duration.

[0048] The transceiver may be configured to at least partially blank a downlink transmission time interval, wherein the transceiver may be configured to use a blanked portion of the at least partially blanked downlink transmission time interval for receiving uplink reference signals from other transceivers during the downlink transmission time interval in the downlink frequency band.

[0049] Therefore, the transceiver can be configured to utilize channel reciprocity to estimate the characteristics of the communication channel from other transceivers to the transceiver based on the received uplink reference signal, wherein the transceiver can be configured to precode data to be sent to the other transceivers in a subsequent transmission time interval based on the estimated characteristics of the communication channel from the other transceivers to the transceiver.

[0050] The transceiver may be configured to signal to the other transceivers a portion of the downlink transmission time interval to be used by the other transceivers for at least partially blanking the uplink reference signal.

[0051] The transceiver may be configured to use a blanking portion of the at least partially blanked downlink transmission time interval for receiving at least two uplink reference signals from at least two other transceivers within the downlink transmission time interval in the downlink frequency band, wherein the at least two uplink reference signals are orthogonal to each other.

[0052] The transceiver may be configured to signal a transmission authorization to other transceivers of other cells of the communication system in a blanking portion of the at least partially blanked transmission time interval, or to signal a blanking pattern for at least partially blanking the transmission time interval to other transceivers of other cells of the communication system.

[0053] The transceiver may be configured to transmit or receive control information using a blanking portion of the at least partially blanked transmission time interval.

[0054] Therefore, the control information is MIMO feedback information.

[0055] For example, the MIMO feedback information may be a preferred antenna port to be used by the transmitter, a preferred matrix index (PMI) of the corresponding precoding matrix, or a rank indication (RI) of the MIMO channel matrix.

[0056] In an embodiment, the transceiver may be a base station in a wireless communication system, and the data signal is an IFFT-based signal having a plurality of frames including a plurality of subframes.

[0057] For example, IFFT (Inverse Fast Fourier Transform)-based signals can include OFDM with CP or DFT-s-OFDM with CP, as well as IFFT-based waveforms without CP. For example, OFDM with CP can be used for downlink transmission. For example, DFT-s-OFDM with CP can be used for uplink transmission.

[0058] In an embodiment, the transceiver may be configured to receive a blanking pattern from the interference optimizing terminal, the blanking pattern indicating blanking of resource elements based on a transmission time interval.

[0059] For example, the interference optimization terminal may be an external entity (e.g., SON = Self-Organizing Network) configured to signal a transceiver (e.g., a base station) to blank resources based on a shortened transmission time interval. The interference optimization terminal may be an external optimization engine (SON = Self-Organizing Network) attached to a base station that communicates with the base station to optimize the interference level.

[0060] A further embodiment provides a transceiver, wherein the transceiver is configured to transmit or receive data in at least one transmission time interval on a determined allocated resource element of a wireless communication system, wherein the transceiver is configured to transmit a reference signal in a blanking portion of the transmission time interval for at least partial blanking of a data block to be received by the transceiver.

[0061] In an embodiment, the transceiver may be a second type of transceiver, such as a mobile terminal (UE) of a wireless communication system. Alternatively, the transceiver may also be a base station (eNB) or a secondary link device of the wireless communication system.

[0062] In an embodiment, a transceiver may be configured to transmit or receive data using a data signal, the data signal comprising a plurality of frames, each frame comprising a plurality of subframes, and each subframe having a plurality of symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein a transmission time interval is defined by a predefined number of symbols in the time domain.

[0063] In an embodiment, the transmission time interval may be shorter than one subframe.

[0064] In an embodiment, the transceiver is configurable to send the reference signal to the other transceivers in a blanked portion of the at least partially blanked transmission time interval based on a transmission grant signaled by the other transceiver, the transmission grant indicating the blanked portion of the at least partially blanked transmission interval for sending the reference signal.

[0065] In an embodiment, at least a subset of the symbols of the at least partially blanked transmission time interval may be blanked in the time domain.

[0066] In an embodiment, at least a subset of the subcarriers in the frequency domain of a transmission time interval are blanked.

[0067] In an embodiment, at least a subset of resource elements of a transmission time interval are blanked in at least one of the time domain and the frequency domain.

[0068] In an embodiment, a transmission time interval for data blocks to be received by a transceiver in a downlink frequency band or during a downlink time interval of a wireless communication system is at least partially blanked, wherein the transceiver is configured to send a reference signal using a blanked portion of the at least partially blanked transmission time interval.

[0069] In an embodiment, at least one of a data channel and a control channel of a transmission time interval is blanked, wherein the transceiver is configured to send the reference signal using the blanking channel of the transmission time interval.

[0070] In an embodiment, the downlink transmission time interval is at least partially blanked, wherein the transceiver may be configured to use the blanked portion of the at least partially blanked downlink transmission time interval for sending uplink reference signals in the downlink transmission time interval to other transceivers in the downlink frequency band or during the downlink time interval.

[0071] For example, in an FDD system, different uplink and downlink frequencies may be used, where uplink feedback transmission may be performed during the blanking portion of the downlink resources. In a TDD system, the same uplink and downlink frequency bands may be used, where uplink feedback transmission may be performed during the blanking portion of the downlink resources.

[0072] In an embodiment, the transceiver may be configured to receive signal information indicating a portion of a downlink transmission time interval to be used by the transceiver for sending an uplink reference signal.

[0073] In an embodiment, the transceiver may be configured to transmit or receive control information using a blanking portion of the at least partially blanked transmission time interval.

[0074] Therefore, the control information may be MIMO feedback information.

[0075] In an embodiment, the transceiver may be a mobile terminal in a wireless communication system, the data signal is an IFFT-based signal, the IFFT-based signal has a plurality of frames, and the frame includes a plurality of subframes.

[0076] For example, IFFT (Inverse Fast Fourier Transform)-based signals can include OFDM with CP or DFT-s-OFDM with CP, as well as IFFT-based waveforms without CP. For example, OFDM with CP can be used for downlink transmission. For example, DFT-s-OFDM with CP can be used for uplink transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, in which:

[0078] Figure 1 A schematic diagram showing the uplink subframe structure of an LTE resource grid;

[0079] Figure 2 A schematic diagram showing the LTE Type 1 FDD frame structure in the time domain;

[0080] Figure 3 A schematic diagram showing the LTE Type 2 TDD frame structure in the time domain;

[0081] Figure 4 A schematic diagram illustrating an example of a wireless communication system including a plurality of base stations;

[0082] Figure 5 shows an example of an OFDMA subframe for two antenna ports as may be used for conventional LTE downlink communications;

[0083] Figure 6 Schematic diagram showing examples of four different configurations (patterns) of downlink subframes with blanking of the sTTI at different time positions;

[0084] Figure 7 a is a schematic diagram showing an example of a downlink subframe with partial blanking of the sTTI;

[0085] Figure 7 b is a schematic diagram showing an example of a downlink sTTI having a length of two OFDM symbols;

[0086] Figure 7 c is a schematic diagram showing an example of a downlink sTTI having a length of seven OFDM symbols;

[0087] Figure 8 A schematic diagram illustrating an example of a downlink subframe with partial sTTI blanking;

[0088] FIG9 shows a table message that may be used between a group of base stations (n=number of base stations=n NBs) to coordinate interference by aligning blanking patterns, thereby optimizing overall network performance;

[0089] Figure 10 A schematic diagram illustrating an example of a downlink subframe with a partially blanked sTTI and an uplink feedback transmission embedded in the blanked sTTI;

[0090] Figure 11 A schematic diagram illustrating an example of a downlink physical resource block (subframe) of an LTE FDD system;

[0091] Figure 12 A table showing sICIC message configuration;

[0092] Figure 13 A schematic block diagram illustrating full-duplex operation of the eNB 160;

[0093] Figure 14 A flow chart illustrating the operation of a communication system with uplink feedback in a blanked sTTI;

[0094] Figure 15 a is a schematic diagram showing resources of an FDD system;

[0095] Figure 15 b is a schematic diagram showing resources of a TDD system;

[0096] Figure 16 a schematic diagram illustrating a wireless communication system for transmitting information from a transmitter to a receiver; and

[0097] Figure 17 A schematic diagram illustrating a transmitter for transmitting data or information to a receiver in a wireless communication system according to an embodiment; DETAILED DESCRIPTION

[0098] Hereinafter, preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings, wherein elements having the same or similar functions are indicated by the same reference numerals.

[0099] Wireless communication systems (such as Figure 4 As shown, data transmission in IFFT-based (such as OFDMA) systems can use Figure 2The resource grid structure shown. The TTI, also known as the transmission time interval, is chosen to be 1 millisecond, which is the duration of a subframe (also known as a data signal block). A receiver, such as a mobile user, processes data with a granularity of 1 millisecond, i.e., the receiver synchronized with the wireless network processes the control information every millisecond. If the processed control information indicates that the data is destined for the receiver, the data channel is decoded. There may be situations, such as extreme real-time communication use cases, such as ultra-low latency (ULD) services, where the end-to-end latency needs to be reduced to 1 millisecond or less. When the receiver processes data with a granularity of 1 millisecond, a reduction in end-to-end latency cannot be achieved. A reduction in latency to 1 millisecond or less can bring significant benefits in terms of increased throughput, for example, in File Transfer Protocol (FTP) / Transmission Control Protocol (TCP) transmissions, optimizing TCP-acknowledgement messages in TCP slow start mode, and can also lead to faster processing at the application layer. In Figure 2 In the example, the sTTI length of the subframe is two OFDM symbols.

[0100] exist Figure 5 In OFDM symbols 0 and 1, the region defined by multiple resource elements 106 is called the control region 114 of the data signal block, and the remaining symbols 2 to 13 are called the payload region 116. The control region 114 is used to transmit control data to the UE, such as in the PDCCH, PCFICH, and PHICH. Several resource elements in the control region are allocated to the PCFICH, and several resource elements are allocated to the PHICH. Other resource elements in the control region are allocated to the PDCCH. The PDCCH can carry control data for uplink / downlink communication between the user equipment (UE) and the base station and for operating the UE. The control region can also transmit a reference signal 110. Some resource elements may not be used, for example, resource element 112. The control region 114 is also called the control channel of the subframe.

[0101] For FDD and TDD systems, a new radio frame structure is currently under discussion to better support Ultra-Reliable Low Latency Communication (URLLC) traffic. However, the limitation on subframe size can be overcome by introducing the short TTI (sTTI) concept in future LTE releases, see for example the 3GPP work item on latency reduction. The current working assumption for the future LTE Release 14 is to allow the sTTI concept with the following configurations:

[0102] For FDD systems:

[0103] - Downlink (PDSCH), working assumptions: sTTI with 2, 3-4, 7 OFDM symbols (OS)

[0104] - Uplink (PUSCH), working assumption: sTTI with 2, 3-4 OFDM symbols (OS)

[0105] TDD system working assumptions:

[0106] -1-time slot (=7 OFDM symbols) sTTI of sPDSCH / sPDCCH / sPUSCH / sPUCCH

[0107] In future mobile communications standards known as New Radio (NR) or 5G, the length of the TTI may be reduced to support a shortened version with only one OFDM symbol, or at least to support the configurations described above, which were proposed for URLLC in LTE Release 14.

[0108] Blanking in URLLC Frame Structure :

[0109] Similar to subframe blanking, blanking of shortened TTI (sTTI) is allowed depending on the current sTTI configuration. This can be operated in both downlink (DL) and uplink (UL) directions. sTTI blanking can be used for inter-cell interference coordination (ICIC) in the time domain up to OFDM symbol level, in the frequency domain up to subcarrier or physical resource block (PRB = 12 subcarriers in LTE) level, or in any combination of time, frequency and space domains. The combination of sTTI and ICIC can be defined as sICIC.

[0110] The base station may implement DL signaling of the blanking pattern from the eNB to the UE using signaling on a DL control channel (eg, PDCCH).

[0111] sICIC: sttti blanking

[0112] In general, sICIC should support blanking of sTTIs by signaling to the UE to discard the sTTI identified by the sTTI number. During this blanking period, the UE can use discontinuous reception (DRX) mode to save battery power, or listen to the reference symbols (RS) or demodulation reference symbols (DMRS) or specific control channels such as short PDCCH (sPDCCH) for a specific sTTI, or any combination of RS and / or sPDCCH. Blanking may include the modes described below.

[0113] The following describes the STTI blanking schemes and methods supported by sICIC:

[0114] The first mode includes complete blanking. Thus, in both the time and frequency domains, no DRMS ​​and data symbols are transmitted and / or received during a specific STTI.

[0115] The second mode includes data and control channel blanking (RS only). Thus, only RS is transmitted and resource elements (REs) used for data or control channels remain empty to reduce interference or to be left to each UE, optionally for decoding RS / DMRS symbols.

[0116] The third mode includes hybrid blanking. Each sTTI containing RS / DMRS transmits RS / DMRS symbols, and the REs of user data of shortened packets in the DL or UL direction (sPDSCH or sPUSCH) or control channel (sPDCCH) are mapped to the blanked REs.

[0117] The fourth mode includes partial blanking, using different blanking patterns, such as partial blanking of part of the sTTI in the time domain, partial blanking of part of the sTTI in the frequency domain, or a combination of both.

[0118] The fifth mode performs blanking in the side link communication between two or more terminals, where resources are blanked based on sTTI in the time domain and frequency domain.

[0119] Figure 6 Schematic diagram showing examples of four different configurations (modes) of downlink subframes 120. Figure 6 In the figure, the vertical axis represents four different configurations of downlink subframe 120, and the horizontal axis represents the time domain. Subframe 120 can contain 14 OFDM symbols. Subframe 120 can be divided into four parts: the first part 122_0 contains three OFDM symbols, the second part 122_1 contains four OFDM symbols, the third part 122_2 contains three OFDM symbols, and the fourth part 122_3 contains four OFDM symbols.

[0120] like Figure 6 As shown, in the first mode 124_0, the blanked sTTI may include 3 OFDM symbols of the first part 122_0. In the second mode 124_1, the blanked sTTI may include 4 OFDM symbols of the second part 122_1. In the third mode 124_2, the blanked sTTI may include 3 OFDM symbols of the third part 122_2. In the fourth mode 124_3, the blanked sTTI may include 4 OFDM symbols of the fourth part 122_3.

[0121] in other words, Figure 6 Partial blanking in sTTI mode is shown, for example for sTTI 3+4 OFDM symbol (OS) operation.

[0122] Figure 7 a is a schematic diagram showing an example of a downlink subframe 120 with partial blanking of the sTTI 126. Figure 7In a, the ordinate represents the frequency domain and the abscissa represents the time domain. The (partially) blanked sTTI 126 may comprise a length of two OFDM symbols. Of course, other lengths are also possible, such as 3, 4 or 7 OFDM symbols. As described in further detail below, the (partially) blanked sTTI of the downlink subframe 120 may be used as uplink feedback, for example for uplink transmission of channel feedback, such as CSI or RS or DMRS or pilot sequence.

[0123] Figure 7 b is a schematic diagram showing an example of a downlink sTTI 126 having a length of two OFDM symbols 128_0 and 128_1. Figure 7 In FIG. 1 , the ordinate represents the frequency domain and the abscissa represents the time domain. The first OFDM symbol 128_0 of the sTTI 126 may be used as a guard interval, wherein the second OFDM symbol 128_1 of the sTTI 126 may be used as uplink feedback, e.g., for uplink transmission of CSI or RS or DMRS for one uE or more than one uE (if a multiplexing scheme such as FDMA is used).

[0124] Figure 7 c is a schematic diagram showing an example of a downlink sTTI 126 having a length of 7 OFDM symbols 128_0 to 128_6. Figure 7 In FIG. 1 , the ordinate represents the frequency domain and the abscissa represents the time domain. The first to third OFDM symbols 128_0 to 128_2 of the STTI 126 may be used as a guard interval, wherein the fourth to seventh OFDM symbols 128_3 to 128_6 of the STTI 126 may be used as uplink feedback, e.g., for uplink transmission of CSI or RS or DMRS for one uE or more than one uE (if a multiplexing scheme such as TDMA and / or FDMA is used).

[0125] in other words, Figure 7 a to Figure 7 c shows sICIC, i.e., blanking of sTTI (depending on the sTTI configuration), blanking of sTTI or groups of sTTIs. As described in further detail below, the blanked symbols can be used for uplink feedback, such as multiplexing of uplink channel state information (CSI) or sounding reference signals (SRS) if multiple users send feedback in the blanked sTTI.

[0126] Figure 8 Schematic diagram showing an example of a downlink subframe 120 with partial sTTI 126 blanking. Figure 8 In the figure, the vertical axis represents the frequency domain and the horizontal axis represents the time domain. Figure 8As shown, the first subband 130_0 is reserved for sTTI operation and the second subband 130_1 is reserved for legacy uE. The (partially) blanked sTTI 126 may have, for example, a length of two OFDM symbols 128_0 and 128_1 in (only) the first subband 130_0.

[0127] in other words, Figure 8 It is shown that in a predefined part of the LTE radio frame, the sTTI in the subband is partially blanked as the TTI traffic is shortened.

[0128] sICIC signaling over X2

[0129] In a multi-cell environment, neighboring base stations can coordinate interference by aligning blanking patterns, thereby optimizing overall network performance. For sICIC operation in a multi-cell environment, at least one of the following messages may be used.

[0130] For example, sICIC messages, similar to messages in eICIC / feICIC, may be used to support the exchange of blanking patterns between base stations on an interface between eNBs (eg, an X2 interface).

[0131] In addition, messages for inter-base station signaling can be used, similar to the almost blanking subframe (ABS) field, such as (a) blanking resource elements (RE) / RE groups, (b) blanking sTTI regions, and (c) reducing power consumption in sTTI regions.

[0132] Additionally, messages with timing alignment information between neighboring eNBs may be used so that the blanking schemes are synchronized in the time domain.

[0133] The above message may be sent by the eNB to neighboring base stations (eNBs) to convey load and interference coordination information, see 3GPP TS 36.423, section 9.1.2.1 [5].

[0134] Therefore, the transmission direction may be from the first base station eNB1 to the second base station eNB2.

[0135] FIG9 shows a table message that may be used between n NBs to coordinate interference by aligning blanking patterns, thereby optimizing overall network performance.

[0136] sICIC signaling from external entities

[0137] It is also possible to signal sTTI-based blanking patterns from an external computer for optimization of the cellular network infrastructure, such as for self-organizing networks (SON). This requires an interface between the external computer and the base station.

[0138] Multi-sector enhancement for cell-edge UEs

[0139] In an embodiment, this operation can be extended to multi-sector operation, where, depending on the location of the UE, the blanked sTTI can be reused in adjacent cell sites. The eNB can reuse the same resources for UEs in different locations.

[0140] For example, blanked sTTIs can be reused in adjacent cells if the UEs are not co-located, that is, if the UEs are not near each other and therefore cannot interfere with each other.

[0141] Embed channel feedback in the stti frame structure

[0142] In an embodiment, the blanked sTTI can be used to embed a sounding reference signal (SRS) in the DL or UL direction, and in the mutual transfer of UL SRS in the DL band for CSI precoding in the FDD band. Since the sTTI concept allows for more flexible configuration of signals on the time-frequency grid, this enables fast sub-band and wideband feedback of reference signals. Therefore, the SRS can include greater flexibility and can be used to feed back CSI from more antennas, thereby enabling MIMO systems with higher feedback requirements, such as MIMO, FD-MIMO, M-MIMO. Massive MIMO (M-MIMO) refers to a MIMO system with a very large number of transmit and / or receive antennas, such as 100 or more antenna ports.

[0143] Add additional SRS (in PDCCH and / or PDSCH)

[0144] In an embodiment, additional reference signals may be embedded in the DL control and / or data channels to support channel estimation for a larger set of transmit antennas at the UE in a smaller time interval (due to the shortened or overclocked TTI of a standard LTE system). Due to the shortened symbol duration, a larger number of antennas may be estimated within, for example, 10 ms, compared to a standard LTE system.

[0145] In an embodiment, reference symbols (RS), such as additional demodulation reference symbols (DMRS), may be added to the downlink control channel.

[0146] In an embodiment, antenna-specific reference symbols (RS) may be embedded into the downlink data channel instead of payload data.

[0147] Figure 10 Schematic diagram showing an example of a downlink subframe 120 with a partially blanked sTTI and an uplink feedback transmission embedded in the blanked sTTI. Figure 10 In the figure, the vertical axis represents the frequency domain and the horizontal axis represents the time domain.

[0148] like Figure 10As shown, the downlink subframe 120 may include a first (completely) blanked STTI 126_0 extending over the entire frequency band of the downlink subframe 120, and a partially blanked STTI 126_1 extending only over a subband 130 of the frequency band of the downlink subframe 120. The STTI may be used for uplink feedback transmissions of one uE or more than one uE. Figure 10 In the embodiment, the two uEs perform uplink feedback transmission in the blanked stti 126_0 and 126_1 using an FDMA and / or TDMA scheme, for example. The uplink feedback transmission may include, for example, the transmission of an SRS. Figure 10 The transmission of the SRS 132_0 of the first uE and the transmission of the SRS 132_1 of the second uE in the blanking sTTI 126_0 and 126_1 are shown exemplarily.

[0149] That is to say, Figure 10 RS is embedded in the DL radio frame on the time-frequency grid. Therefore, SRS can be embedded in the sTTI area in the DL radio frame. SRS of several UEs can be multiplexed to be used in the SRS comb structure, for example, using alternating SRS of orthogonal sequences.

[0150] Add additional SRS (in PUCCH and / or PUSCH)

[0151] Furthermore, in an embodiment, additional SRS feedback may be embedded in an uplink (UL) radio frame. To this end, the data mapping of the embedded SRS sequence may be modified according to the LTE UL radio frame structure, particularly the time-frequency grid requirements of the SC-FDMA structure.

[0152] Interactive SRS in FDD Systems

[0153] In an embodiment, the baseline system can be an FDD system with DL and UL located in a common frequency band, where the base station requires an SRS for the DL channel. This SRS can be used for precoding in the DL. Since the wireless channel is highly variable, the base station needs fast feedback to avoid using outdated channel state information. Here, the UE's SRS can be embedded in the blanked DL sTTI, so that the UE feeds back the UL SRS in the DL frame structure on the same frequency band. The base station can measure the SRS sequence and reconstruct the radio channel using channel reciprocity. This information can be used in subsequent scheduling intervals to precode data to this UE.

[0154] To this end, the base station can allocate UL time slots to the UE and, if necessary, a protection period in order to trigger the UL SRS from a specific UE. In addition, in order to reduce the number of UL SRS embedded in the DL radio frame, the base station can multiplex multiple UEs into the same sTTI using orthogonal sequences. This may require signaling information from the base station to the relevant UEs. In addition, the base station can configure the time periods or patterns in which the same UL SRS signal can be repeated to reduce the signaling information in the DL, for example by specifying the exact time periods and allocated frequency positions when and / or where the SRS information is transmitted. The base station can define the bandwidth used by the UL SRS, which can vary depending on the number of UEs (if several UEs are multiplexed into the same time / frequency resources).

[0155] The sTTI used can be an sTTI without a DL RS signal, that is, a DL OFDM symbol that usually only transmits PDSCH.

[0156] In an embodiment, eMBMS subframes can be reused. To avoid interference between DL RS and new UL SRS signals, the eNB can reuse eMBMS DL subframes, which are blank subframes without DL DRMS ​​symbols. Here, UL sTTI SRS combs can be triggered without conflicting with DL DRMS.

[0157] Figure 11 A schematic diagram showing an example of a downlink physical resource block (subframe) 120 of an LTE FDD system. Figure 11 In the figure, the ordinate represents the frequency domain, and the abscissa represents the time domain. Downlink subframe 120 includes two time slots 140_0 and 140_1. Each of time slots 140_0 and 140_1 contains seven symbols 142_0 through 142_6 and 142_7 through 142_13. That is, downlink subframe 120 contains 14 symbols 142_0 through 142_13. Furthermore, 12 subcarriers 144_0 through 144_11 are available for downlink subframe 120. Therefore, 168 resource elements are available in the downlink subframe.

[0158] In addition, Figure 11In the figure, resource elements allocated to PDCCH (Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel) and PHICH (Physical Hybrid ARQ (Automatic Repeat Request) Indicator Channel) are denoted by reference numeral 150, resource elements allocated to sPDCCH (short TTI PDCCH) are denoted by reference numeral 152, resource elements allocated to RS (cell-specific reference signal) of the selected Tx antenna port are denoted by reference numeral 154, resource elements allocated to unused resource elements by the selected Tx antenna port or undefined resource elements for all ports are denoted by reference numeral 156, resource elements allocated to guard symbols are denoted by reference numeral 158, resource elements allocated to uplink pilot comb (i.e., SRS) are denoted by reference numeral 160, and resource elements allocated to sPDSCH (downlink sTTI) are denoted by reference numeral 162.

[0159] in other words, Figure 11 One physical resource block (PRB) of a DL radio frame of a complete LTE FDD carrier configured with sTTI is shown, with the sTTI terminating after two OFDM symbols (OS). The sTTIs in slot 0 140_0 and slot 140_1 at OS-2-3 indicated by reference numeral 160 (blue markers) are UL SRS symbols transmitted by one or more UEs, see the pilot SRS comb (black and light blue) in slot 0 140_0 indicated by reference numeral 160. SRS can be used for precoding of consecutive DL sTTIs, such as OS-5-6 in sPDSCH. Depending on the timing advance (TA) of the UE, it may be necessary to include a small guard period for switching between DL and UL sTTIs, see reference numeral 158 (light grey shaded area) in OS-1 of slot 0 140_0 and slot 1 140_1.

[0160] Multi-cell expansion

[0161] In a multi-cell environment, a message can be used to signal to neighboring cells over the X2 interface which area can be used for UL CSI transmission in a sTTI, similar to Figure 12 The sICIC message shown.

[0162] Feedback control signaling using URLLC frame structure

[0163] In an embodiment, the sTTI / URLLC frame structure can be reused to send other control information from the eNB to the UE or from the UE to the eNB. This will allow dedicated signaling channels to be implemented using the sTTI frame structure.

[0164] Exchange MIMO feedback

[0165] In an embodiment, the stti / urllc frame structure may be reused to provide additional multi-antenna feedback, such as transmission of beam steering vectors or precoding matrix feedback for MIMO systems with many antennas, e.g., as required for FD- or M-MIMO systems.

[0166] Full-duplex operation

[0167] In an embodiment, the eNB can operate in full-duplex mode for simultaneous DL and UL traffic within the same DL frequency band. Here, the eNB allows simultaneous DL sPDSCH transmission and UL sTTI SRS feedback reception from one or more UEs. Since the eNB knows the DL symbols it is to transmit, these symbols can be stored and subtracted from the received SRS symbols in the UL, which allows this synchronous transmission mode.

[0168] Figure 13 A schematic block diagram illustrating full-duplex operation of an eNB 160 is shown. The eNB 160 may be configured to transmit downlink (DL) signals, e.g., to a UE, e.g., via antenna 162. Furthermore, the eNB 160 may be configured to receive uplink (UL) signals, e.g., from the UE, e.g., via antenna 162, during transmission of the DL signals and within the frequency band of the DL signals. The eNB 160 may be configured to subtract the DL signals from the received UL signals to obtain a net UL signal.

[0169] in other words, Figure 13 Full duplex operation is shown with the DL signal subtracted from the received UL SRS.

[0170] Figure 14 Flowchart of the operation of a communication system with blanked uplink feedback in a sTTI. The communication system may include a first type of transceiver 170 (e.g., a base station (eNB)) and a second type of transceiver 172 (e.g., a mobile terminal (UE)). The first type of transceiver 170 may include a transmitter and a receiver (transmitter 1 / receiver 1). The second type of transceiver 172 may include a transmitter and a receiver (transmitter 2 / receiver 2). The first type of transceiver 170 may be configured to perform resource allocation.

[0171] The transceiver 170 of the first type may be configured to perform, in a first step 174, blanking of (downlink) resources (e.g., (partial) blanking of a sTTI of a (downlink) resource block). The transceiver 170 of the first type may include a scheduler configured to schedule blanking of resources. Of course, the transceiver 170 of the first type may also be configured to perform resource blanking based on, for example, scheduling information received from a scheduler of, for example, another transceiver of the first type.

[0172] The first type of transceiver 170 may be configured to signal an uplink feedback grant to the second type of transceiver 172 in the blanked resources in a second step 176 .

[0173] The second type of transceiver 172 may be configured to transmit uplink feedback data (eg, UL SRS) in the downlink resources of the first type of transceiver 170 in a third step 178 .

[0174] The first type of transceiver 170 may be configured to perform channel estimation based on uplink feedback data (eg, UL SRS) received from the second type of transceiver 172 in a fourth step 180 .

[0175] Figure 15 a is a schematic diagram showing the resources of the FDD system. Figure 15 In a, a downlink resource block (eg, subframe) 186 and an uplink resource block (eg, subframe) 187 of an FDD system are shown. Therefore, the ordinate represents the frequency domain, and the abscissa represents the time domain.

[0176] like Figure 15 As shown in FIG. 1 a , DL resource blocks and UL resource blocks may be allocated to different (non-overlapping) frequency bands. UL resource block 187 may be reserved for legacy UL transmissions.

[0177] A downlink resource block (or downlink subframe) 186 may include a (partially) blanked stti 126, which may be used for uplink feedback transmission, e.g., by a uE. The remainder of the downlink resource block (or downlink subframe) 186 may be used for downlink control data and downlink data transmission.

[0178] Figure 15 FIG. 2 b shows a schematic diagram of resources of a TDD system. Depending on the TDD system configuration, subframe 120 may be a downlink subframe (i.e., a subframe reserved for downlink transmission) or an uplink subframe (i.e., a subframe reserved for uplink transmission), wherein a switching subframe may be used as a protection between downlink subframes and uplink subframes.

[0179] The downlink subframe of the TDD system can be similar to Figure 15 a) configure the downlink subframe described in a.

[0180] The embodiments of the present invention may be used in Figure 16 The wireless communication system shown is implemented and includes a transmitter 202 (such as a base station) and a receiver 203 (such as a mobile terminal). Figure 16 FIG is a schematic diagram of a wireless communication system 200 for transmitting information from a transmitter TX to a receiver RX. The transmitter TX includes at least one antenna ANTTX , the receiver RX comprises at least one antenna ANT RX . In other embodiments, the transmitter TX and / or the receiver RX may include more than one antenna to implement MIMO, SIMO or MISO. As shown by arrow 204, a signal is transmitted from the transmitter TX to the receiver RX via a wireless communication link (such as a radio link). The transmission can be in accordance with an OFDMA or IFFT-based communication method, and the transmission time interval referenced above represents the time period of radio transmission from the transmitter TX to the receiver RX. The transmitter TX includes an input 206 for receiving data to be transmitted to the receiver RX. The input data 206 is received at an OFDMA modulator 208, which includes a signal processor 210 for processing the received signal 206 to generate a data signal to be transmitted to the receiver RX. The signaling between the transmitter TX and RX is consistent with the above-mentioned embodiments of the present invention. For example, the transmitter may include an OFDMA modulator that operates to generate an SPS configuration message, the SPS configuration message including an SPS interval defined based on a TTI and / or including additional control data. The receiver RX receives the signal from the transmitter TX via an antenna and applies the signal to the OFDMA demodulator 212 . The OFDMA demodulator 212 includes a signal processor 214 for processing the received signal to generate an output signal 216 .

[0181] Figure 17 FIG3 is a schematic diagram of a transmitter 300 in a wireless communication system for transmitting information to a receiver according to the above-described embodiments. Transmitter 300 receives data 302 encoded by a channel encoder 304, modulated by a modulator 306, and mapped to multiple carriers by a mapper 308. Signal 310 is combined at 312 with a control signal 314 provided by a control channel element 316 and a control mapper 318, pilot symbols 320 from a pilot symbol generator 322, and a PSS / SSS signal 324 from a PSS / SSS signal generator 326. Combined signal 328 is provided to an IFFT+CP block 330 and converted to the analog domain by a DAC 332. Analog signal 336 is processed for radio transmission and ultimately transmitted by an antenna 338. According to embodiments, aspects of the present invention may be implemented using mapper 318 for mapping control data, for example, to generate an SPS configuration message containing an SPS / SSS interval defined based on a TTI and / or containing additional control data.

[0182] Embodiments provide better or improved (even optimized) performance in downlink radio transmissions by using a highly flexible and ultra-low latency UL feedback channel to optimize DL MIMO transmissions for systems with many transmit antennas (e.g., particularly for FD-MIMO or M-MIMO systems).

[0183] For example, embodiments may be applied in enhanced mobile broadband (eMBB) services or any other radio communication with multiple antennas (MIMO, FD-MIMO, M-MIMO).

[0184] It should be noted that the present disclosure may also have the following configurations.

[0185]

[01] A transceiver,

[0186] wherein the transceiver is configured to transmit or receive data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system;

[0187] wherein the transceiver is configured to at least partially blank a transmission time interval of a data block to be transmitted or received by the transceiver;

[0188] wherein the transceiver is configured as

[0189] - signalling to other transceivers a transmission authorization in the blanking portion of said at least partially blanked transmission time interval,

[0190] - or at least partially blanking the transmission time interval based on blanking patterns received from other transceivers.

[0191]

[02] The transceiver according to

[01] , configured to transmit or receive data using a data signal, wherein the data signal includes a plurality of frames, each frame includes a plurality of subframes, and each subframe has a plurality of symbols in the time domain and a plurality of subcarriers in the frequency domain,

[0192] The transmission time interval is defined by a predefined number of symbols in the time domain.

[0193]

[03] The transceiver according to

[01] or

[02] , wherein the transmission time interval is shorter than one subframe.

[0194]

[04] The transceiver according to any one of

[01] to

[03] , configured to at least partially blank the transmission time interval by blanking at least a subset of symbols in the time domain of the transmission time interval.

[0195]

[05] The transceiver according to any one of

[01] to

[04] , configured to at least partially blank the transmission time interval by blanking at least a subset of subcarriers in the frequency domain of the transmission time interval.

[0196]

[06] The transceiver according to any one of

[01] to

[05] , configured to at least partially blank the transmission time interval by blanking at least a subset of resource elements of the transmission time interval in at least one of the time domain and the frequency domain.

[0197]

[07] The transceiver according to any one of

[01] to

[06] , configured to signal to other transceivers a transmission authorization for sending a reference signal in a blanking portion of the at least partially blanked transmission time interval.

[0198]

[08] The transceiver according to

[07] , configured to use a downlink control channel to signal the transmission authorization.

[0199]

[09] The transceiver according to any one of

[01] to

[08] , configured to blank at least one of a demodulation reference symbol and a data symbol in the at least partially blanked transmission time interval.

[0200]

[10] The transceiver according to any one of

[01] to

[09] , configured to blank all symbols of the transmission time interval.

[0201]

[11] The transceiver according to any one of

[01] to

[10] , configured to send only at least one of a reference symbol and a demodulation reference symbol in the at least partially blanked transmission time interval.

[0202]

[12] The transceiver according to

[11] , configured to not transmit at least one of a data symbol and a control symbol in the at least partially blanked transmission time interval.

[0203]

[13] The transceiver according to any one of

[01] to

[12] , configured to partially blank a portion of the transmission time interval in at least one of the time domain and the frequency domain.

[0204]

[14] The transceiver according to any one of

[01] to

[13] , configured to use the blanked portion of the at least partially blanked transmission time interval for sending or receiving a reference signal.

[0205]

[15] The transceiver according to

[14] , configured to at least partially blank a transmission time interval for a data block to be transmitted by the transceiver in a downlink frequency band or during a downlink time interval of the wireless communication system;

[0206] The transceiver is configured to use the blanking portion of the at least partially blanked transmission time interval for receiving a reference signal from the other transceiver in a downlink frequency band or during a downlink time interval of the wireless communication system.

[0207]

[16] The transceiver according to one of

[14] and

[15] , configured to blank at least one of a data channel and a control channel in the transmission time interval;

[0208] The transceiver is configured to receive the reference signal from the other transceiver using the blanking channel of the transmission time interval.

[0209]

[17] The transceiver according to any one of

[14] to

[16] , configured to at least partially blank a downlink transmission time interval;

[0210] The transceiver is configured to use a blanking portion of the at least partially blanked downlink transmission time interval for receiving uplink reference signals from the other transceivers within the downlink transmission time interval in the downlink frequency band.

[0211]

[18] The transceiver according to

[17] , configured to estimate characteristics of a communication channel from the other transceiver to the transceiver using channel reciprocity based on the received uplink reference signal;

[0212] The transceiver is configured to precode data to be sent to the other transceivers in subsequent transmission time intervals based on estimated characteristics of the communication channels from the other transceivers to the transceiver.

[0213]

[19] A transceiver according to one of

[17] and

[18] , configured to signal to the other transceiver the portion of the at least partially blanked downlink transmission time interval to be used by the other transceiver to send the uplink reference signal.

[0214]

[20] The transceiver according to any one of

[17] to

[19] , configured to use the blanked portion of the at least partially blanked downlink transmission time interval for receiving at least two uplink reference signals from at least two other transceivers in the downlink transmission time interval in the downlink frequency band;

[0215] At least two uplink reference signals are orthogonal to each other.

[0216]

[21] A transceiver according to any one of

[14] to

[20] , configured to signal a transmission authorization to other transceivers in other cells of the communication system in the blanking portion of the at least partially blanked transmission time interval, or to signal a blanking pattern for at least partially blanking the transmission time interval to other transceivers in other cells of the communication system.

[0217]

[22] The transceiver according to any one of

[01] to

[21] , configured to use the blanking portion of the at least partially blanked transmission time interval for sending or receiving control information.

[0218]

[23] The transceiver according to

[22] , wherein the control information is MIMO feedback information.

[0219]

[24] A transceiver according to any one of

[01] to

[23] , wherein the transceiver is a base station in the wireless communication system, the data signal is an IFFT-based signal, the IFFT-based signal has multiple frames, and the frame includes multiple subframes.

[0220]

[25] The transceiver according to any one of

[01] to

[24] , wherein the transceiver is configured to receive the blanking pattern from an interference optimization terminal, the blanking pattern indicating blanking of resource elements based on the transmission time interval.

[0221]

[26] A transceiver,

[0222] wherein the transceiver is configured to transmit or receive data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system;

[0223] Wherein the transceiver is configured to transmit a reference signal in a blanking portion of a transmission time interval for at least a portion of a blanking of a data block to be received by the transceiver.

[0224]

[27] The transceiver according to

[26] , configured to transmit or receive data using a data signal, wherein the data signal includes a plurality of frames, each frame includes a plurality of subframes, and each subframe has a plurality of symbols in the time domain and a plurality of subcarriers in the frequency domain,

[0225] The transmission time interval is defined by a predefined number of symbols in the time domain.

[0226]

[28] The transceiver according to

[27] , wherein the transmission time interval is shorter than one subframe.

[0227]

[29] A transceiver according to any one of

[26] to

[28] , wherein the transceiver is configured to send a reference signal to the other transceiver in a blanked portion of the at least partially blanked transmission time interval based on a transmission authorization signaled by the other transceiver, the transmission authorization indicating the blanked portion of the at least partially blanked transmission interval to be used for sending the reference signal.

[0228]

[30] A transceiver according to any one of

[26] to

[29] , wherein at least a subset of the symbols of the at least partially blanked transmission time interval are blanked in the time domain.

[0229]

[31] A transceiver according to any one of

[26] to

[30] , wherein at least a subset of subcarriers in the frequency domain of the transmission time interval are blanked.

[0230]

[32] A transceiver according to any one of

[26] to

[31] , wherein at least a subset of the resource elements of the transmission time interval are blanked in at least one of the time domain and the frequency domain.

[0231]

[33] The transceiver according to any one of

[26] to

[32] , wherein a transmission time interval for a data block to be received by the transceiver in a downlink frequency band of the wireless communication system or during a downlink time interval is at least partially blanked;

[0232] The transceiver is configured to transmit the reference signal using a blanking portion of the at least partially blanked transmission time interval.

[0233]

[34] The transceiver according to any one of

[26] to

[33] , wherein at least one of the data channel and the control channel of the transmission time interval is blanked;

[0234] The transceiver is configured to send the reference signal using a blanking channel of the transmission time interval.

[0235]

[35] The transceiver according to any one of

[26] to

[34] , wherein the downlink transmission time interval is at least partially blanked;

[0236] The transceiver is configured to use the blanking portion of the at least partially blanked downlink transmission time interval for sending an uplink reference signal to other transceivers in the downlink transmission time interval in a downlink frequency band or a downlink time interval.

[0237]

[36] The transceiver according to any one of

[26] to

[35] , configured to receive signal information indicating a portion of the downlink transmission time interval to be used by the transceiver to send the uplink reference signal.

[0238]

[37] The transceiver according to any one of

[26] to

[36] , configured to send or receive control information using the blanking portion of the at least partially blanked transmission time interval.

[0239]

[38] The transceiver according to

[37] , wherein the control information is MIMO feedback information.

[0240]

[39] A transceiver according to any one of

[26] to

[38] , wherein the transceiver is a mobile terminal in the wireless communication system, and the data signal is an IFFT-based signal, the IFFT-based signal having multiple frames, the frame including multiple subframes.

[0241]

[40] A wireless communication system comprising

[0242] A transceiver of the first type according to any one of [1] to

[25] ; and

[0243] A second type of transceiver according to any one of

[26] to

[39] .

[0244]

[41] A method for sending, comprising:

[0245] transmitting or receiving data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system; at least partially blanking the transmission time interval for data blocks to be transmitted or received; and

[0246] signaling a transmission authorization to other transceivers during a blanking portion of the at least partially blanked transmission time interval;

[0247] Or at least partially blanking the transmission time interval based on a blanking pattern received from other transceivers.

[0248]

[42] A method for receiving, comprising:

[0249] transmitting or receiving data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system;

[0250] The reference signal is sent in a blanking portion of a transmission time interval for at least partial blanking of a data block to be received.

[0251]

[43] A non-transitory computer program product comprising a computer-readable medium storing instructions, which, when executed on a computer, perform the method as described in any one of

[41] to

[42] .

[0252] Although certain aspects of the concepts have been described in the context of an apparatus, it is apparent that these aspects also represent a description of a corresponding method, where a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method step also represent a description of a corresponding block, item, or feature of a corresponding apparatus.

[0253] Depending on specific implementation requirements, embodiments of the present invention may be implemented in hardware or software. They may be implemented using a digital storage medium, such as a floppy disk, DVD, Blu-ray, CD, ROM, PROM, EPROM, EEPROM, or flash memory, having stored thereon electronically readable control signals that cooperate (or are capable of cooperating) with a programmable computer system to perform the corresponding method. Thus, the digital storage medium may be computer-readable.

[0254] Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.

[0255] Generally, the embodiments of the present invention can be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer.For example, the program code can be stored on a machine-readable carrier.

[0256] Further embodiments comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier. In other words, an embodiment of the inventive method is therefore a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.

[0257] Therefore, a further embodiment of the method of the present invention is a data carrier (or digital storage medium, or computer-readable medium) comprising a computer program recorded thereon for performing one of the methods described herein. Therefore, a further embodiment of the method of the present invention is a data stream or signal sequence representing a computer program for performing one of the methods described herein. For example, the data stream or signal sequence can be configured to be transmitted via a data communication connection (e.g., via the Internet). Further embodiments include a processing device, such as a computer or a programmable logic device, configured to or adapted to perform one of the methods described herein. Further embodiments include a computer having a computer program for performing one of the methods described herein installed thereon.

[0258] In some embodiments, a programmable logic device (e.g., a field programmable gate array) can be used to perform some or all of the functions of the methods described herein. In some embodiments, the field programmable gate array can cooperate with a microprocessor to perform one of the methods described herein. Generally, the methods are preferably performed by any hardware device.

[0259] The above embodiments are merely illustrative of the principles of the present invention. It should be understood that modifications and variations of the arrangements and details described herein will be readily apparent to those skilled in the art. Accordingly, the present invention is intended to be limited solely by the scope of the following claims and not by the specific details presented through the description and explanation of the present embodiments.

[0260] Abbreviations and symbols

[0261] eNB Evolved Node B (3G base station)

[0262] LTE Long Term Evolution

[0263] UE or uE User Equipment (User Terminal)

[0264] RRM Radio Resource Management

[0265] TDD Time Division Duplex

[0266] FDD Frequency Division Duplex

[0267] MIMO Multiple Input Multiple Output

[0268] OFDM Orthogonal Frequency Division Duplex

[0269] OFDMA Orthogonal Frequency Division Multiple Access

[0270] CQI Channel Quality Information

[0271] CRC Cyclic Redundancy Check

[0272] SPS Semi-persistent Scheduling

[0273] DCI Downlink Control Information

[0274] UL Uplink

[0275] DL Downlink

[0276] (s)TTI (short) Transmission Time Interval

[0277] PUSCH Physical Uplink Shared Channel

[0278] PUCCH Physical Uplink Control Channel

[0279] PDSCH Physical Downlink Shared Channel

[0280] PDCCH Physical Downlink Control Channel

[0281] URLLC Ultra-Reliable Low Latency Communication

[0282] MBSFN Multimedia Broadcast Single Frequency Network

[0283] C-RNTI Wireless Cellular Network Temporary Identification

[0284] SON self-organizing network

[0285] References

[0286] [1]3GPP TS 36.211 V13.1.0

[0287] [2]3GPP TS 36.213 V13.1.1

[0288] [3]http: / / niviuk.free.fr / lte_srs.php

[0289] [4] http: / / howltestuffworks.blogspot.de / 2014 / 07 / sounding-reference- signal-procedure.html

[0290] [5]3GPP TS 36.423,sect.9.1.2.1

Claims

1. A transceiver comprising a transmitter and a receiver; wherein the transceiver is configured to receive data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system; wherein the transceiver is configured to at least partially blank a transmission time interval; wherein the transceiver is configured as receiving a transmission grant from another transceiver in a blanked portion of the at least partially blanked transmission time interval, wherein the transceiver is configured to receive data using a data signal, the data signal comprising a plurality of frames, each frame comprising a plurality of subframes, and each subframe comprising a plurality of symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein the transmission time interval is defined by a predefined number of symbols in the time domain, The transmission time interval is shorter than one subframe.

2. The transceiver of claim 1 , configured to at least partially blank the transmission time interval by blanking at least a subset of symbols within the time domain of the transmission time interval.

3. The transceiver of claim 1, configured to at least partially blank the transmission time interval by blanking at least a subset of subcarriers within the frequency domain of the transmission time interval.

4. The transceiver of claim 1 , configured to at least partially blank the transmission time interval by blanking at least a subset of resource elements of the transmission time interval in at least one of a time domain and a frequency domain.

5. The transceiver of claim 1, configured to signal to other transceivers a transmission grant for sending a reference signal in a blanked portion of the at least partially blanked transmission time interval. The transceiver of claim 5 , configured to signal the transmission grant using a downlink control channel. 7 . The transceiver of claim 1 , configured to blank at least one of a demodulation reference symbol and a data symbol in the at least partially blanked transmission time interval.

8. The transceiver of claim 5, configured to blank all symbols of the transmission time interval.

9. The transceiver of claim 1, configured to transmit only at least one of a reference symbol and a demodulation reference symbol in the at least partially blanked transmission time interval.

10. The transceiver of claim 9, configured to not transmit at least one of a data symbol and a control symbol in the at least partially blanked transmission time interval.

11. The transceiver of claim 1 , configured to partially blank portions of the transmission time interval in at least one of a time domain and a frequency domain.

12. The transceiver of claim 1, configured to use a blanked portion of the at least partially blanked transmission time interval for transmitting or receiving a reference signal.

13. The transceiver according to claim 12, configured to at least partially blank a transmission time interval for a data block to be transmitted by the transceiver in a downlink frequency band or during a downlink time interval of the wireless communication system; in, The transceiver is configured to use a blanked portion of the at least partially blanked transmission time interval for receiving a reference signal from the other transceiver in a downlink frequency band or during a downlink time interval of the wireless communication system.

14. The transceiver of claim 12, configured to blank at least one of a data channel and a control channel in the transmission time interval; The transceiver is configured to receive the reference signal from the other transceiver using the blanked channel of the transmission time interval.

15. The transceiver of claim 12, configured to at least partially blank a downlink transmission time interval; The transceiver is configured to use a blanking portion of the at least partially blanked downlink transmission time interval for receiving uplink reference signals from the other transceivers within the downlink transmission time interval in the downlink frequency band.

16. The transceiver of claim 15, configured to estimate characteristics of a communication channel from the other transceivers to the transceiver using channel reciprocity based on the received uplink reference signal; The transceiver is configured to precode data to be sent to the other transceivers in subsequent transmission time intervals based on estimated characteristics of the communication channels from the other transceivers to the transceiver.

17. The transceiver of claim 15, configured to signal to the other transceiver the portion of the at least partially blanked downlink transmission time interval to be used by the other transceiver for sending the uplink reference signal.

18. The transceiver of claim 15, configured to use a blanked portion of the at least partially blanked downlink transmission time interval for receiving at least two uplink reference signals from at least two other transceivers within the downlink transmission time interval in the downlink frequency band; At least two uplink reference signals are orthogonal to each other.

19. The transceiver of claim 12 , configured to signal a transmission authorization to other transceivers of other cells of the communication system in the blanking portion of the at least partially blanked transmission time interval, or to signal a blanking pattern for at least partially blanking the transmission time interval to other transceivers of other cells of the communication system.

20. The transceiver of claim 1, configured to use a blanked portion of the at least partially blanked transmission time interval for transmitting or receiving control information.

21. The transceiver of claim 20, wherein the control information is MIMO feedback information.

22. The transceiver according to claim 1, wherein the transceiver is a base station in the wireless communication system, the data signal is an IFFT-based signal, the IFFT-based signal includes a plurality of frames, and the frame includes a plurality of subframes.

23. The transceiver of claim 1, wherein the transceiver is configured to receive a blanking pattern from an interference optimizing terminal, the blanking pattern indicating blanking of resource elements based on the transmission time interval.

24. A method for transmitting, comprising: receiving data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system; at least partially blanking a transmission time interval; as well as receiving a transmission grant from another transceiver in a blanked portion of the at least partially blanked transmission time interval, wherein data is received using a data signal, the data signal comprising a plurality of frames, each frame comprising a plurality of subframes, and each subframe comprising a plurality of symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein the transmission time interval is defined by a predefined number of symbols in the time domain, The transmission time interval is shorter than one subframe.

25. A non-transitory digital storage medium having stored thereon a computer program for performing, when executed by a computer, a method for transmitting, comprising: receiving data in at least one transmission time interval on the determined allocated resource elements of the wireless communication system; at least partially blanking a transmission time interval; as well as receiving a transmission grant from another transceiver in a blanked portion of the at least partially blanked transmission time interval, wherein data is received using a data signal, the data signal comprising a plurality of frames, each frame comprising a plurality of subframes, and each subframe comprising a plurality of symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein the transmission time interval is defined by a predefined number of symbols in the time domain, The transmission time interval is shorter than one subframe.

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