EP2982058A1 - Musteranzeigesignal zum anzeigen für ein neues dmrs-muster - Google Patents

Musteranzeigesignal zum anzeigen für ein neues dmrs-muster

Info

Publication number
EP2982058A1
EP2982058A1 EP14778916.8A EP14778916A EP2982058A1 EP 2982058 A1 EP2982058 A1 EP 2982058A1 EP 14778916 A EP14778916 A EP 14778916A EP 2982058 A1 EP2982058 A1 EP 2982058A1
Authority
EP
European Patent Office
Prior art keywords
pattern
reduced
drms
indicator field
cell station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14778916.8A
Other languages
English (en)
French (fr)
Other versions
EP2982058A4 (de
Inventor
Shafi BASHAR
Seunghee Han
Jong-Kae Fwu
Alexei Vladimirovich Davydov
Mo-Han Fong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel IP Corp
Original Assignee
Intel IP Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel IP Corp filed Critical Intel IP Corp
Publication of EP2982058A1 publication Critical patent/EP2982058A1/de
Publication of EP2982058A4 publication Critical patent/EP2982058A4/de
Withdrawn legal-status Critical Current

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Classifications

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • DRMS Demodulation reference signals
  • FIGs. 1A, IB, 1C, ID, and IE are block diagrams of demodulation reference signal (DMRS) pattern designs to reduce overhead in small cell scenarios according to an example embodiment.
  • DMRS demodulation reference signal
  • FIGs. 2A and 2B are example DMRS pattern designs for NCT according to an example embodiment.
  • FIG. 3 is a flowchart representation of a method implemented by user equipment according to an example embodiment.
  • FIG. 4 is a flowchart representation of a method implemented by a small cell station according to an example embodiment.
  • FIG. 5 is a block diagram of a communication system for implementing various example embodiments.
  • the software may consist of computer executable instructions stored on computer readable media such as memory or other type of storage devices. Further, such functions correspond to modules, which are software, hardware, firmware or any combination thereof. Multiple functions may be performed in one or more modules as desired, and the embodiments described are merely examples.
  • the software may be executed on a digital signal processor, ASIC, microprocessor, or other type of processor operating on a computer system, such as a personal computer, server or other computer system.
  • DMRS downlink UE-specific demodulation reference signal
  • Small cells are generally lower powered nodes in a
  • Small cells communicate directly with user equipment, such as cell phones and other mobile devices and provide data offloading for macro cells, allowing an increase in network capacity the number of mobile devices that may be handled.
  • the mobile devices may be fairly stationary and close to the small cells, allowing DMRS overhead reduction for mobile devices communicating with the small cells.
  • Example uses of small cells include but are not limited to providing home and small business in-building, and outdoor wireless service.
  • FIGs. 1A, IB, 1C, ID, and IE illustrate multiple example DMRS pattern designs that provide for reduced overhead for small cell scenarios at 110, 115, 120, 125, and 130.
  • subframe bundling based DMRS overhead reduction may also be applied, where no DMRS is transmitted in PRB (physical resource block) pairs, and the channel estimation is based on the DMRS transmitted in the PRB pairs of the adjacent subframe, or the adjacent PRBs.
  • DMRS pattern design may be optimized for all 14 symbols in a subframe. For example, In FIGs. 2A and 2B, example new DMRS pattern designs for NCT are illustrated 200 and 210. For both the reduced overhead DMRS design for small cell and new DMRS design for NCT, eNodeB needs to indicate to the UE whether the transmitted DMRS pattern is legacy Release- 10 pattern or new Release- 12 pattern.
  • eNodeB may dynamically switch between the legacy Release-10 pattern and the new Release-12 design depending on channel conditions. For example, eNodeB scheduler can choose to use the Release-10 DMRS pattern to transmit reference signal if the channel condition deteriorates, whereas the reduced overhead DMRS pattern may be used for small cell scenarios with good channel condition to increase the spectral efficiency.
  • Deterioration of channel conditions may be said to begin when the SNR decreases to a point that throughput also starts to decrease. Some decrease in throughput may be tolerable, but when it affects data transfer or voice quality, the channel is deemed to have sufficiently deteriorated to switch to a higher overhead pattern.
  • the point may be defined as anywhere between the start of throughput degradation and tolerable throughput decrease.
  • a new indicator field may be defined to indicate to the UE whether the DMRS pattern is legacy Release- 10 pattern or a new Release- 12 pattern.
  • Such indicator signal may be implemented in the LTE standards in the two different ways, by introducing new bit fields in the DCI (downlink control information) signal, or by introducing new bit fields in the RRC (radio resource control) signaling.
  • an indicator signal used in DCI is more appropriate.
  • the indicator field in RRC signaling By introducing the indicator field in RRC signaling, a semi static allocation is possible, with reduced overhead. Two different bit fields can be introduced, where bit field 0 can indicate the transmission of reduced overhead DMRS signal and the bit field 1 can indicate the transmission of new DMRS patterns introduced for NCT. Alternatively, a single bit field can also be used to indicate the transmission of Rel-12 or Rel-10 DMRS pattern. Depending on the scenario, UE may interpret the Rel-12 signal as reduced overhead DMRS signal or the new DMRS patterns in NCT.
  • FIG. 3 is a flowchart illustration of a method 300 implemented by a device such as user equipment in one embodiment.
  • the user equipment receives an indicator field at 310.
  • the indicator field is used by the user equipment to identify whether a reduced overhead DRMS pattern is being transmitted at 315.
  • the pattern is received and decoded at 320 for use in determining how the user equipment will communicate with a small cell station.
  • the indicator field includes two bits. The user equipment uses the first bit to indicate a type of pattern to be used. The second bit is used to identify transmission of a reduced pattern or not a reduced pattern.
  • FIG. 4 is a flowchart illustration of a method 400 implemented by a small cell station to communicate with multiple user equipment.
  • the small cell station determines whether a reduced overhead DRMS pattern is appropriate for communications with multiple devices such as user equipment communicatively coupled to the small cell station.
  • the station then generates an indicator field at 410 to identify whether a reduced overhead DRMS pattern is being transmitted.
  • the station generates the reduced overhead DRMS pattern.
  • the station transmits the indicator field and the pattern such that it can be received by the devices.
  • DCI format 2B, 2C and 2D are used for assignment of transmission mode 8, 9 and 10 respectively. Additional DCI format or transmission mode may also be introduced in Release- 12 that can make use of DMRS based transmission schemes. In all these cases, additional 1 or 2 bits long field can be introduced in DCI signal to indicate the transmission of Release- 10 DMRS or the Release- 12 DMRS pattern. As for an example, the following example changes may be used in Section 5.3.3.1.5D in [7] to reflect such changes in DCI format 2D (changes shown in italics):
  • nsci D is the scrambling identity for antenna ports 7 and 8 defined in section 6.10.3.1 of [2]
  • transport block 1 is mapped to codeword 0; and transport block 2 is mapped to codeword 1.
  • bit field indicator value of ' 11 ' can also be used to indicate reduced overhead NCT DMRS pattern, if introduced. Similar changes also apply to other DCI formats such as DCI format 2B, DCI format 2C, and any future DCI formats introduced in the specification. Another example of the invention may require the following changes in DCI format 2D in Section 5.3.3.1.5D in [7]:
  • downlink bandwidth is less than or equal to 10 PRBs, there is no resource allocation header and resource allocation type 0 is assumed.
  • - DMRS pattern indicator -1 bit when set to zero or is not present, legacy DMRS patterns are used. When the bit is set to 1 , reduced overhead DMRS patterns are used. [0030] If both transport blocks are enabled; transport block 1 is mapped to codeword 0; and transport block 2 is mapped to codeword 1.
  • DMRS pattern indicator can indicate the transmission of new DMRS patterns used for new carrier type.
  • the indicator field can also be introduced in RRC signaling.
  • One example of such indicator may utilize the following changes (shown in italics) in Section 6.3.2. of [8]:
  • AntennaInfoDedicated-v920 :: SEQUENCE ⁇
  • AntennaInfoDedicated-rl2 :: SEQUENCE ⁇
  • codebookSubsetRestriction-rl2 BIT STRING OPTIONAL, - Cond TMX
  • Parameter represents the number of cell specific antenna ports where corresponds to 1, an2 to 2 antenna ports etc. see TS 36.211 [21, 6.2.1].
  • codebookSubsetRestriction Parameter codebookSubsetRestriction, see TS 36.213 [23, 7.2] and TS 36.211 [21, 6.3.4.2.3].
  • the number of bits in the codebookSubsetRestriction for applicable transmission modes is defined in TS 36.213 [23, Table 7.2-lb]. If the UE is configured with transmissionMode tm8, E-UTRAN only configures the field codebookSubsetRestriction if PMI/RI reporting is configured. If the UE is configured with transmissionMode tm9, E-UTRAN only configures the field codebookSubsetRestriction if PMI/RI reporting is configured and if the number of CSI-RS ports is greater than 1.
  • the field indicates whether UE transmit antenna selection control is closed-loop or open- loop as described in TS 36.213 [23, 8.7].
  • EUTRAN configures the same value for all serving cells.
  • Parameter represents DMRS patterns selection. Value 0 means legacy DMRS pattern. Value 1 means NCT DMRS pattern. Value 2 means reduced overhead DMRS pattern. Value 4 is reserved for future use.
  • transmissionMode is set to tm3, tm4, tm5 or Otherwise the field is not present and the UE shall delete any existing value for field.
  • TM8 The field is optional present, need OR, if
  • transmissionMode is set to tm8. If
  • transmissionMode is set to a value other than tm8, the field is not present and th shall delete any existing value for this field. Otherwise the field is not present and UE takes no action i.e. continues to use the existing value, if previously configured.
  • TMX The field is mandatory present if the
  • transmissionMode-rlO is set to tm3, tm4, tm6, tm8 or tm9. Otherwise the field is not present and the UE shall delete any exis value for this field.
  • transmissionMode-rl2 is set to tm8-v920, vl020, or tmlO-vl 130. Otherwise the field is not present and the UE shall delete existing value for this field.
  • Another embodiment of the indicator signal may utilize the following changes (shown in italics) in Section 6.3.2. of [8]:
  • AntennaInfoDedicated-v920 :: SEQUENCE ⁇
  • AntennaInfoDedicated-rl2 :: SEQUENCE ⁇
  • transmissionMode-rl2 ENUMERATED ⁇ tml, tm2, tni3, tni4, tm5, tni6, tni7,
  • Parameter represents the number of cell specific antenna ports where anl corresponds to 1, an2 to 2 antenna ports etc. see TS 36.211 [21, 6.2.1].
  • codebookSubsetRestriction see TS 36.213 [23, 7.2] and TS 36.211 [21, 6.3.4.2.3].
  • the number of bits in the codebookSubsetRestriction for applicable transmission modes is defined in TS 36.213 [23, Table 7.2-lb]. If the UE is configured with transmissionMode tm8, E-UTRAN only configures the field codebookSubsetRestriction if PMI/RI reporting is configured. If the UE is configured with transmissionMode tm9, E-UTRAN only configures the field codebookSubsetRestriction if PMI/RI reporting is configured and if the number of CSI-RS ports is greater than 1.
  • ue-TransmitAntennaSelection For value setup the field indicates whether UE transmit antenna selection control is closed-loop or open- loop as described in TS 36.213 [23, 8.7]. EUTRAN configures the same value for all serving cells.
  • Parameter represents DMRS patterns selection. Value 0 means legacy DMRS pattern. Value 1 means reduced overhead DMRS pattern.
  • bit string may be optional.
  • Value 1 can indicate new DMRS pattern for NCT transmission.
  • FIG. 8 is a block diagram of a specifically programmed computer system to act as one or more different types of devices, such as user equipment, cell stations, including small cell stations and macro stations.
  • the system may be used to implement one or more methods according to the examples described.
  • a hardware and operating environment is provided to enable the computer system to execute one or more methods and functions that are described herein.
  • the system may be a small cell station, macro cell station, smart phone, tablet, or other networked device that can provide access and wireless networking capabilities to one or more devices. Such devices need not have all the components included in FIG. 8.
  • FIG. 8 illustrates a functional block diagram of a cell station 800 in accordance with some embodiments.
  • Cell station 800 may be suitable for use as a small cell station, macro cell station, or user equipment, such as a wireless cell phone, tablet or other computer.
  • the cell station 800 may include physical layer circuitry 802 for transmitting and receiving signals to and from eNBs using one or more antennas 801.
  • Cell station 800 may also include processing circuitry 804 that may include, among other things a channel estimator.
  • Cell station 800 may also include memory 806.
  • the processing circuitry may be configured to determine several different feedback values discussed below for transmission to the eNB.
  • the processing circuitry may also include a media access control (MAC) layer.
  • MAC media access control
  • the cell station 800 may include one or more of a keyboard, a display, a non- volatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements.
  • the display may be an LCD screen including a touch screen.
  • the one or more antennas 801 utilized by the cell station 800 may comprise one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of antennas suitable for transmission of RF signals.
  • a single antenna with multiple apertures may be used instead of two or more antennas.
  • each aperture may be considered a separate antenna.
  • MIMO multiple-input multiple- output
  • the antennas may be effectively separated to take advantage of spatial diversity and the different channel characteristics that may result between each of antennas and the antennas of a transmitting station.
  • the antennas may be separated by up to 1/10 of a wavelength or more.
  • the cell station 800 is illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements.
  • DSPs digital signal processors
  • some elements may comprise one or more microprocessors, DSPs, application specific integrated circuits (ASICs), radio-frequency integrated circuits (RFICs) and combinations of various hardware and logic circuitry for performing at least the functions described herein.
  • the functional elements may refer to one or more processes operating on one or more processing elements.
  • Embodiments may be implemented in one or a combination of hardware, firmware and software. Embodiments may also be implemented as instructions stored on a computer-readable storage medium, which may be read and executed by at least one processor to perform the operations described herein.
  • a computer-readable storage medium may include any non-transitory mechanism for storing information in a form readable by a machine (e.g., a computer).
  • a computer-readable storage medium may include read- only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, and other storage devices and media.
  • ROM read- only memory
  • RAM random-access memory
  • magnetic disk storage media e.g., magnetic disks, optical storage media, flash-memory devices, and other storage devices and media.
  • one or more processors of the cell station 800 may be configured with the instructions to perform the operations described herein.
  • the cell station 800 may be configured to receive OFDM communication signals over a multicarrier communication channel in accordance with an OFDMA communication technique.
  • the OFDM signals may comprise a plurality of orthogonal subcarriers.
  • evolved node Bs may be part of a broadband wireless access (BWA) network communication network, such as a Worldwide Interoperability for Microwave Access (WiMAX) communication network or a 3rd Generation Partnership Project (3GPP) Universal Terrestrial Radio Access Network (UTRAN) Long-Term-Evolution (LTE) or a Long-Term-Evolution (LTE) communication network, although the scope of the invention is not limited in this respect.
  • WiMAX Worldwide Interoperability for Microwave Access
  • 3GPP 3rd Generation Partnership Project
  • UTRAN Universal Terrestrial Radio Access Network
  • LTE Long-Term-Evolution
  • LTE Long-Term-Evolution
  • the cell station 800 and the eNBs may be configured to communicate in accordance with an orthogonal frequency division multiple access (OFDMA) technique.
  • OFDMA orthogonal frequency division multiple access
  • the UTRAN LTE standards include the 3rd Generation Partnership Project (3 GPP) standards for UTRAN-LTE, release 8, March 2008, and release 10, December 2010, including variations and evolutions thereof.
  • the basic unit of the wireless resource is the Physical Resource Block (PRB).
  • the PRB may comprise 12 sub-carriers in the frequency domain x 0.5 ms in the time domain.
  • the PRBs may be allocated in pairs (in the time domain).
  • the PRB may comprise a plurality of resource elements (REs).
  • a RE may comprise one sub- carrier x one symbol.
  • Two types of reference signals may be transmitted by an eNB including demodulation reference signals (DM-RS), channel state information reference signals (CIS-RS) and/or a common reference signal (CRS).
  • DM-RS demodulation reference signals
  • CIS-RS channel state information reference signals
  • CRS common reference signal
  • the DM- RS may be used by the UE for data demodulation.
  • the reference signals may be transmitted in predetermined PRBs.
  • the OFDMA technique may be either a frequency domain duplexing (FDD) technique that uses different uplink and downlink spectrum or a time-domain duplexing (TDD) technique that uses the same spectrum for uplink and downlink.
  • FDD frequency domain duplexing
  • TDD time-domain duplexing
  • the cell station 800 and the eNBs may be configured to communicate signals that were transmitted using one or more other modulation techniques such as spread spectrum modulation (e.g., direct sequence code division multiple access (DS-CDMA) and/or frequency hopping code division multiple access (FH-CDMA)), time-division multiplexing (TDM) modulation, and/or frequency-division multiplexing (FDM) modulation, although the scope of the embodiments is not limited in this respect.
  • spread spectrum modulation e.g., direct sequence code division multiple access (DS-CDMA) and/or frequency hopping code division multiple access (FH-CDMA)
  • TDM time-division multiplexing
  • FDM frequency-division multiplexing
  • the cell station 800 may be part of a portable wireless communication device, such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may receive and/or transmit information wirelessly.
  • PDA personal digital assistant
  • a laptop or portable computer with wireless communication capability such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may receive and/or transmit information wirelessly.
  • a portable wireless communication device such as a personal digital assistant (PDA), a laptop
  • the cell station 800 may calculate several different feedback values which may be used to perform channel adaption for closed-loop spatial multiplexing transmission mode.
  • These feedback values may include a channel-quality indicator (CQI), a rank indicator (RI) and a precoding matrix indicator (PMI).
  • CQI channel-quality indicator
  • RI rank indicator
  • PMI precoding matrix indicator
  • the transmitter selects one of several modulation alphabets and code rate combinations.
  • the RI informs the transmitter about the number of useful transmission layers for the current MIMO channel
  • the PMI indicates the codebook index of the precoding matrix (depending on the number of transmit antennas) that is applied at the transmitter.
  • the code rate used by the eNB may be based on the CQI.
  • the PMI may be a vector that is calculated by the cell station and reported to the eNB.
  • the cell station may transmit a physical uplink control channel (PUCCH) of format 2, 2a or 2b containing the CQI/PMI or RI.
  • PUCCH physical uplink control channel
  • the CQI may be an indication of the downlink mobile radio channel quality as experienced by the cell station 800.
  • the CQI allows the cell station 800 to propose to an eNB an optimum modulation scheme and coding rate to use for a given radio link quality so that the resulting transport block error rate would not exceed a certain value, such as 10%.
  • the cell station may report a wideband CQI value which refers to the channel quality of the system bandwidth.
  • the cell station may also report a sub-band CQI value per sub-band of a certain number of resource blocks which may be configured by higher layers. The full set of sub- bands may cover the system bandwidth. In case of spatial multiplexing, a CQI per code word may be reported.
  • the PMI may indicate an optimum precoding matrix to be used by the eNB for a given radio condition.
  • the PMI value refers to the codebook table.
  • the network configures the number of resource blocks that are represented by a PMI report.
  • multiple PMI reports may be provided. PMI reports may also be provided for closed loop spatial multiplexing, multi-user MIMO and closed-loop rank 1 precoding MIMO modes.
  • the network may be configured for joint transmissions to a cell station in which two or more cooperating/coordinating points, such as remote-radio heads (RRHs) transmit jointly.
  • the joint transmissions may be MIMO transmissions and the cooperating points are configured to perform joint beamforming.
  • LTE uses cell specific reference signals (i.e., pilot symbols) inserted in both time and frequency. These pilot symbols provide an estimate of the channel at given locations within a subframe. Through interpolation it is possible to estimate the channel across an arbitrary number of subframes.
  • the pilot symbols in LTE are assigned positions within a subframe depending on the eNodeB cell
  • the unique positioning of the pilots ensures that they do not interfere with one another and can be used to provide a reliable estimate of the complex gains imparted onto each resource element within the transmitted grid by the propagation channel.
  • the least square estimates are averaged using an averaging window. This simple method produces a substantial reduction in the level of noise found on the pilots. There are two pilot symbol averaging methods available.
  • Time averaging is performed across each pilot symbol carrying subcarrier, resulting in a column vector containing an average amplitude and phase for each reference signal carrying subcarrier.
  • All the pilot symbols found in a subcarrier are time averaged across all OFDM symbols, resulting in a column vector containing the average for each reference signal subcarrier, The averages of the pilot symbol subcarriers are then frequency averaged using a moving window of maximum size.
  • the PSS and SSS provide the cell station with its physical layer identity within the cell.
  • the signals may also provide frequency and time synchronization within the cell.
  • the PSS may be constructed from Zadoff-Chu (ZC) sequences and the length of the sequence may be predetermined (e.g., 62) in the frequency domain.
  • ZC Zadoff-Chu
  • the SSS uses two interleaved sequences (i.e., maximum length sequences (MLS), SRGsequences or m- sequences) which are of a predetermined length (e.g., 31).
  • MLS maximum length sequences
  • SRGsequences or m- sequences i.e., m- sequences
  • the SSS may be scrambled with the PSS sequences that determine physical layer ID.
  • the SSS provides the cell station with information about the cell ID, frame timing properties and the cyclic prefix (CP) length.
  • the cell station may also be informed whether to use TDD or FD.
  • the PSS may be located in the last OFDM symbol in first and eleventh slot of the frame, followed by the SSS in the next symbol.
  • the PSS may be sent in the third symbol of the 3rd and 13th slots while SSS may be transmitted three symbols earlier.
  • the PSS provided the cell station with information about to which of the three groups of physical layers the cell belongs to (3 groups of 168 physical layers).
  • One of 168 SSS sequences may be decoded right after PSS and defines the cell group identity directly.
  • the cell station may be configured in one of 8 "transmission modes" for PDSCH reception:; Mode 1 : Single antenna port, port 0; Mode 2: Transmit diversity; Mode 3 : Large-delay CDD; Mode 4: Closed- loop spatial multiplexing; Mode 5: MU-MIMO; Mode 6: Closed-loop spatial multiplexing, single layer; Mode 7: Single antenna port, cell station -specific RS (port 5); Mode 8 (new in Rel-9): Single or dual-layer transmission with cell station -specific RS (ports 7 and/or 8).
  • the CSI-RS are used by the cell station for channel estimates (i.e., CQI measurements).
  • the CSI- RS are transmitted periodically in particular antenna ports (up to eight transmit antenna ports) at different subcarrier frequencies (assigned to the cell station) for use in estimating a MIMO channel.
  • a cell station - specific demodulation reference signal e.g., a DM-RS
  • a device comprising:
  • a memory having instructions for execution by the processor to:
  • DRMS reduced overhead demodulation reference signal
  • DRMS pattern is reduced in frequency and in time.
  • the indicator field comprises bits in a downlink control information (DCI) signal.
  • DCI downlink control information
  • RRC radio resource control
  • a system comprising:
  • transceiver having a power range corresponding to a small cell station; a processor;
  • a memory having instructions for execution by the processor to:
  • DRMS reduced overhead demodulation reference signal
  • a method comprising:
  • DRMS reduced overhead demodulation reference signal

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EP14778916.8A 2013-04-04 2014-04-03 Musteranzeigesignal zum anzeigen für ein neues dmrs-muster Withdrawn EP2982058A4 (de)

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US201361808597P 2013-04-04 2013-04-04
US14/137,500 US9258104B2 (en) 2013-04-04 2013-12-20 Pattern indicator signal for new DMRS pattern
PCT/US2014/032795 WO2014165656A1 (en) 2013-04-04 2014-04-03 Pattern indicator signal for new dmrs pattern

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EP14780270.6A Active EP2982197B1 (de) 2013-04-04 2014-03-21 Paging-wiederholung für erhöhte robustheit für verlängerte paging-zyklen
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