WO2017135989A1 - Transmission de canal partagé de liaison descendante physique avec un intervalle de temps de transmission court - Google Patents

Transmission de canal partagé de liaison descendante physique avec un intervalle de temps de transmission court Download PDF

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Publication number
WO2017135989A1
WO2017135989A1 PCT/US2016/039980 US2016039980W WO2017135989A1 WO 2017135989 A1 WO2017135989 A1 WO 2017135989A1 US 2016039980 W US2016039980 W US 2016039980W WO 2017135989 A1 WO2017135989 A1 WO 2017135989A1
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WIPO (PCT)
Prior art keywords
port
crs
channel
data
physical downlink
Prior art date
Application number
PCT/US2016/039980
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English (en)
Inventor
Alexei Davydov
Hong He
Christian Ibars Casas
Seunghee Han
Original Assignee
Intel IP Corporation
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 Corporation filed Critical Intel IP Corporation
Priority to CN201680078903.9A priority Critical patent/CN108476121B/zh
Publication of WO2017135989A1 publication Critical patent/WO2017135989A1/fr
Priority to HK19100650.0A priority patent/HK1258286A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency

Definitions

  • Low latency is an area of focus in the development of the Long Term Evolution (LTE) standards promulgated by the Third Generation Partnership Project (3GPP). Due to properties of the internet protocols, lower latency over the wireless interface involves realizing higher data rates in conjunction with carrier-aggregation enhancements. With the increasing data rates in LTE standards over the past couple of releases, achievable latency should evolve in a similar manner. In addition, lower latency also will enable support for applications such as traffic safety and/or control and control of critical infrastructure and industry processes. Consequently, 3GPP standards will evolve to provide reduced latency.
  • LTE Long Term Evolution
  • 3GPP Third Generation Partnership Project
  • FIG. 1 is a diagram of a cell-specific reference signal (CRS) partem for four antenna ports in accordance with one or more embodiments;
  • CRS cell-specific reference signal
  • FIG. 2 is a diagram of a physical downlink shared channel (PDSCH) resource block mapping partem for four antenna ports in accordance with one or more embodiments;
  • PDSCH physical downlink shared channel
  • FIG. 3 is a diagram of physical downlink shared channel (PDSCH) transmission on adjacent subframes in accordance with one or more embodiments;
  • PDSCH physical downlink shared channel
  • FIG. 4 is a diagram of a minimum orthogonal frequency-division multiplexing (OFDM) for PDSCH transmission with a short TTI in accordance with one or more embodiments;
  • OFDM orthogonal frequency-division multiplexing
  • FIG. 5 is a flow diagram of physical downlink shared channel transmission with short transmission time interval in accordance with one or more embodiments.
  • FIG. 6 is a diagram of example components of a wireless device in accordance with one or more embodiments. It will be appreciated that for simplicity and/or clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, if considered appropriate, reference numerals have been repeated among the figures to indicate corresponding and/or analogous elements.
  • Coupled may mean that two or more elements are in direct physical and/or electrical contact. Coupled, however, may also mean that two or more elements may not be in direct contact with each other, but yet may still cooperate and/or interact with each other.
  • Coupled may mean that two or more elements do not contact each other but are indirectly joined together via another element or intermediate elements.
  • on may be used in the following description and claims.
  • FIG. 1 shows the resource block pattern 100 for orthogonal frequency-division multiple access (OFDMA) for transmissions between an evolved Node B (eNB) and a user equipment (UE) in accordance with a Third Generation Partnership (3GPP) standard. Time is represented on the horizontal axis and frequency is represented on the vertical axis. Each of the resources blocks represents an orthogonal frequency-division multiplexing (OFDM) symbol or resource block.
  • OFDM orthogonal frequency-division multiplexing
  • a first slot such as slot 0, comprises seven OFDM symbols in time for a total of 0.5 millisecond (ms) and 12 subcarriers in frequency for a total of 180 kilohertz (kHz).
  • One standard transmission time interval comprises two slots, for example slot 0 and slot 1, for a total subframe length of 1.0 ms.
  • the eNB may transmit CRS signals on up to four antenna ports to the UE, wherein the antenna ports are represented as CRS port 0, CRS port 1 , CRS port 2, and CRS port 3.
  • control signals are transmitted in resource blocks 112
  • CRS signals for CRS port 0 and CRS port 1 are transmitted in resource blocks 114
  • CRS signals for CRS port 2 and CRS port 3 are transmitted in resource blocks 116.
  • Physical downlink shared channel (PDSCH) data is transmitted in resource blocks 118.
  • PDSCH Physical downlink shared channel
  • the PDSCH is a downlink channel that may be utilized for dedicated data or common data, and/or for control signaling.
  • resources may be shared between multiple UEs, data may be transmitted simultaneously, and may be particularly suitable for bursty internet protocol (IP) traffic, for example where traffic may be intermittent or sporadic.
  • IP internet protocol
  • the CRS signals are transmitted by the eNB regardless of the PDSCH traffic presence.
  • the density of the CRS pattern for CRS port 0 and CRS port 1 is higher than for CRS port 2 and CRS port 3.
  • eNB may utilize a short TTI that is shorter than the standard 1.0 ms TTI comprising 14 resource blocks 100 as shown in FIG. 1.
  • having a sufficient density of the CRS ports in the time domain facilitates early and accurate estimation of the channel.
  • additional processing by the UE associated with more antenna ports may be avoided in order to reduce the TTI.
  • transmission schemes may be adapted to use only the first two CRS antenna ports, port 0 and port 1, if the UE is configured for a short TTI.
  • the length of the TTI for example a short TTI or a normal length TTI, may be configured for the UE using radio resource control (RRC) signaling, or using a combination of RRC and physical layer (PHY) signaling, wherein the configuration may separate for the downlink (DL) and the uplink (UL), although the scope of the claimed subject matter is not limited in these respects.
  • RRC radio resource control
  • PHY physical layer
  • a short TTI transmission may be utilized to span two adjacent 1.0 ms downlink subframes.
  • a predetermined minimum PDSCH starting position for a short TTI in the 1.0 ms subframe for example the fourth OFDM symbol.
  • a resource block mapping pattern for using only the first two antenna ports for a short TTI is shown in and described with respect to FIG. 2, below.
  • FIG. 2 a diagram of a physical downlink shared channel (PDSCH) resource block mapping pattern for four antenna ports in accordance with one or more embodiments will be discussed.
  • the CRS transmission schemes for PDSCH may be adapted to the resource block mapping partem 200 to only utilize the first two CRS antenna ports, CRS port 0 and CRS port 1, in the event a short TTI is configured for the UE.
  • the physical resource blocks for such an arrangement are shown in FIG. 2 from the perspective of the UE.
  • control signals are transmitted in resource blocks 112
  • CRS signals for CRS port 0 and CRS port 1 are transmitted in resource blocks 114.
  • Physical downlink shared channel (PDSCH) data is transmitted in resource blocks 118.
  • the PDSCH transmission for the UE is only based on the first two CRS ports, CRS port 0 and CRS port 1, so that for PDSCH demodulation, the UE estimates the channel from only the CRS signals received on CRS port 0 and CRS port 1 instead of estimating the channel from the CRS signals on all four CRS ports.
  • the UE assumes zero power resource blocks 210, that is the UE assumes there are no PDSCH transmissions for CRS port 3 and CRS port 4.
  • a short TTI transmission may be utilized to span two adjacent 1.0 ms downlink subframes as shown in and described with respect to FIG. 3, below.
  • PDSCH transmission with a short TTI configuration partem 200 may be utilized on adjacent 1.0 ms subframes, for example subframe 1 and subframe 2.
  • control signals are transmitted in resource blocks 112
  • CRS signals for CRS port 0 and CRS port 1 are transmitted in resource blocks 114.
  • Physical downlink shared channel (PDSCH) data is transmitted in resource blocks 118.
  • the first OFDM resource block of the short TTI pattern 200 may be transmitted in the first 1.0 ms subframe, subframe 1, and the second OFDM symbol of short TTI partem 200 may be transmitted on a next earliest possible OFDM symbol of the second 1.0 ms subframe, subframe 2.
  • Such a transmission arrangement for a short TTI pattern 200 may further increase the spectral efficiency and/or reduce the transmission latency in addition to the benefit achieved by the short TTI partem 200 itself.
  • an additional benefit of using a predetermined minimum PDSCH starting position for a short TTI partem 200 in the 1.0 ms subframe is shown in and described with respect to FIG. 4, below. Referring now to FIG.
  • the PDSCH starting point of the short TTI pattern 200 in the 1.0 ms subframe may be selected to be a predefined symbol number, for example the fourth OFDM symbol, regardless of any control format indicator (CFI) indication by the physical control format indicator channel (PCFICH).
  • CFI control format indicator
  • PCFICH physical control format indicator channel
  • the PDSCH starting point value may be configured via higher layer signaling or fixed in the specification.
  • the PDSCH starting point value may be configured independently for Multicast-broadcast single-frequency network (MBSFN) or non-MBSFN subframes or derived one from each other.
  • the lowest OFDM symbol index in the 1.0 ms subframe can be determined as min(L,2), where L is the higher layer configured value for a non-MBSFN subframe.
  • L is the higher layer configured value for a non-MBSFN subframe.
  • FIG. 4 One example embodiment is shown in FIG. 4, where the minimum OFDM symbol for PDSCH with a short TTI is not determined by CFI of PCFICH. The embodiment shown may be beneficial to reduce UE processing time associated with PCFICH demodulation, although the scope of the claimed subject matter is not limited in this respect.
  • Method 500 may include more or fewer operations than shown in FIG.5, and/or the operations may be arranged in one or more various other orders than shown in FIG. 5, and the scope of the claimed subject matter is not limited in these respects.
  • method 500 may be realized as logic circuitry and/or may be realized as machine readable instructions, optionally stored on a non-transitory computer readable medium having instructions stored thereon that, if executed by a machine such as an applications processor, result in implementation of method 500 in whole or in part.
  • eNB 510 sends a short TTI configuration to UE 512.
  • the length of the TTI may be configured for UE 512 using radio resource control (RRC) signaling, or using a combination of RRC and physical layer (PHY) signaling, wherein the configuration may separate for the downlink (DL) and the uplink (UL), although the scope of the claimed subject matter is not limited in these respects.
  • RRC radio resource control
  • PHY physical layer
  • either of eNB 510 or UE 512 may configure a TTI length in a flexible manner.
  • a particular DL TTI and/or a paired UL TTI length configuration may be selected from one or more of TTI length configurations using a UE dedicated RRC message or using system information block (SIB) message.
  • SIB system information block
  • UE 512 may send its TTI capability information to eNB 510 at the time of an RRC connection establishment phase.
  • a TTI length may be signaled using a medium access control (MAC) control element (CE).
  • MAC medium access control
  • DCI downlink control information
  • UE 512 may first configure for several TTI length candidates by RRC signaling.
  • UE 512 may then determine a TTI length in each subframe by decoding physical downlink control channels (PDCCHs) with a cyclic redundancy check (CRC) scrambled by a dedicated radio network temporary identifier (RNTI) value.
  • PDCCHs physical downlink control channels
  • CRC cyclic redundancy check
  • RNTI dedicated radio network temporary identifier
  • eNB 510 sends CRS signals to UE 512 using four CRS antenna ports, CRS antenna port 0, CRS antenna port 1, CRS antenna port 2, and CRS antenna port 3.
  • UE 512 estimates the channel using only CRS antenna port 0 and CRS antenna port 1.
  • UE 512 send a channel quality indicator (CQI) and/or channel state information (CSI) to eNB 510 indicating a selected channel and/or channel equalization.
  • CQI channel quality indicator
  • CSI channel state information
  • eNB 510 modulates data to be transmitted on PDSCH resource blocks, and at operation 524 eNB sends a PDSCH transmission on a selected channel.
  • UE 512 demodulates the PDSCH to obtain the data wherein the demodulation of data is done using CRS antenna port 0 and CRS antenna port 1, although the scope of the claimed subject matter is not limited in this respect.
  • device 600 may include application circuitry 602, computer readable storage medium or media 612, baseband circuitry 604, Radio Frequency (RF) circuitry 606, front-end module (FEM) circuitry 608 and one or more antennas 610, coupled together at least as shown.
  • RF Radio Frequency
  • FEM front-end module
  • the above described circuitries may be included in various devices, in whole or in part, for example an eNB according to a cloud- RAN (C-RAN) implementation, and the scope of the claimed subject matter is not limited in these respects.
  • C-RAN cloud- RAN
  • Computer readable medium or media 612 may comprise one or more of various types of memory or storage devices including volatile memory and/or non-volatile memory, for example flash memory, dynamic random-access memory (DRAM), static random-access memory (SRAM), NOT OR (NOR) memory, and/or NOT AND (NAND) memory, and the scope of the claimed subject matter is not limited in this respect.
  • volatile memory for example flash memory, dynamic random-access memory (DRAM), static random-access memory (SRAM), NOT OR (NOR) memory, and/or NOT AND (NAND) memory
  • DRAM dynamic random-access memory
  • SRAM static random-access memory
  • NOR NOT OR
  • NAND NOT AND
  • circuitry may refer to, be part of, or include an Application
  • circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware. Embodiments described herein may be implemented into a system using any suitably configured hardware and/or software.
  • Application circuitry 600 may include one or more application processors.
  • application circuitry 600 may include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the one or more processors may include any combination of general- purpose processors and dedicated processors, for example graphics processors, application processors, and so on.
  • the processors may be coupled with and/or may include memory and/or storage and may be configured to execute instructions stored in the memory and/or storage to enable various applications and/or operating systems to run on the system.
  • Baseband circuitry 604 may include circuitry such as, but not limited to, one or more single- core or multi-core processors.
  • Baseband circuitry 604 may include one or more baseband processors and/or control logic to process baseband signals received from a receive signal path of RF circuitry 606 and to generate baseband signals for a transmit signal path of the RF circuitry 606.
  • Baseband processing circuity 604 may interface with the application circuitry 602 for generation and processing of the baseband signals and for controlling operations of the RF circuitry 606.
  • the baseband circuitry 604 may include a second generation (2G) baseband processor 604a, third generation (3G) baseband processor 604b, fourth generation (4G) baseband processor 604c, and/or one or more other baseband processors 604d for other existing generations, generations in development or to be developed in the future, for example fifth generation (5G), sixth generation (6G), and so on.
  • Baseband circuitry 604, for example one or more of baseband processors 604a through 604d may handle various radio control functions that enable communication with one or more radio networks via RF circuitry 606.
  • the radio control functions may include, but are not limited to, signal modulation and/or demodulation, encoding and/or decoding, radio frequency shifting, and so on.
  • modulation and/or demodulation circuitry of baseband circuitry 604 may include Fast-Fourier Transform (FFT), precoding, and/or constellation mapping and/or demapping functionality.
  • FFT Fast-Fourier Transform
  • encoding and/or decoding circuitry of baseband circuitry 604 may include convolution, tail-biting convolution, turbo, Viterbi, and/or Low Density Parity Check (LDPC) encoder and/or decoder functionality.
  • LDPC Low Density Parity Check
  • baseband circuitry 604 may include elements of a protocol stack such as, for example, elements of an evolved universal terrestrial radio access network (EUTRAN) protocol including, for example, physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), and/or radio resource control (RRC) elements.
  • EUTRAN evolved universal terrestrial radio access network
  • Processor 604e of the baseband circuitry 604 may be configured to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP and/or RRC layers.
  • the baseband circuitry may include one or more audio digital signal processors (DSP) 604f.
  • DSP audio digital signal processors
  • the one or more audio DSPs 604f may include elements for compression and/or decompression and/or echo cancellation and may include other suitable processing elements in other embodiments.
  • Components of the baseband circuitry may be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some embodiments.
  • some or all of the constituent components of baseband circuitry 604 and application circuitry 602 may be implemented together such as, for example, on a system on a chip (SOC).
  • SOC system on a chip
  • computer readable storage medium or media 612 may be disposed in whole or at least in part on a separate chip from application circuitry 602, and in other embodiments may be integrated in whole or at least in part on application circuitry 602, although the scope of the claimed subj ect matter is not limited in these respects.
  • baseband circuitry 604 may provide for communication compatible with one or more radio technologies.
  • baseband circuitry 604 may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN).
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • Embodiments in which baseband circuitry 604 is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
  • RF circuitry 606 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • RF circuitry 606 may include switches, filters, amplifiers, and so on, to facilitate the communication with the wireless network.
  • RF circuitry 606 may include a receive signal path which may include circuitry to down-convert RF signals received from FEM circuitry 608 and provide baseband signals to baseband circuitry 604.
  • RF circuitry 606 may also include a transmit signal path which may include circuitry to up-convert baseband signals provided by the baseband circuitry 604 and provide RF output signals to FEM circuitry 608 for transmission.
  • RF circuitry 606 may include a receive signal path and a transmit signal path.
  • the receive signal path of RF circuitry 606 may include mixer circuitry 606a, amplifier circuitry 606b and filter circuitry 606c.
  • the transmit signal path of RF circuitry 606 may include filter circuitry 606c and mixer circuitry 606a.
  • RF circuitry 606 may also include synthesizer circuitry 606d for synthesizing a frequency for use by the mixer circuitry 606a of the receive signal path and the transmit signal path.
  • the mixer circuitry 606a or the receive signal path may be configured to down-convert RF signals received from FEM circuitry 608 based on the synthesized frequency provided by synthesizer circuitry 606d.
  • Amplifier circuitry 606b may be configured to amplify the down-converted signals and the filter circuitry 606c may be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals.
  • Output baseband signals may be provided to baseband circuitry 604 for further processing.
  • the output baseband signals may be zero-frequency baseband signals, although this may be optional.
  • mixer circuitry 606a of the receive signal path may comprise passive mixers, although the scope of the embodiments is not limited in this respect.
  • mixer circuitry 606a of the transmit signal path may be configured to up-convert input baseband signals based on the synthesized frequency provided by synthesizer circuitry 606d to generate RF output signals for FEM circuitry 608.
  • the baseband signals may be provided by the baseband circuitry 604 and may be filtered by filter circuitry 606c.
  • Filter circuitry 606c may include a low-pass filter (LPF), although the scope of the embodiments is not limited in this respect.
  • LPF low-pass filter
  • mixer circuitry 606a of the receive signal path and the mixer circuitry 606a of the transmit signal path may include two or more mixers and may be arranged for quadrature down conversion and/or up conversion respectively.
  • mixer circuitry 606a of the receive signal path and the mixer circuitry 606a of the transmit signal path may include two or more mixers and may be arranged for image rejection, for example Hartley image rejection.
  • mixer circuitry 606a of the receive signal path and the mixer circuitry 606a may be arranged for direct down conversion and/or direct up conversion, respectively.
  • mixer circuitry 606a of the receive signal path and mixer circuitry 606a of the transmit signal path may be configured for super-heterodyne operation.
  • the output baseband signals and the input baseband signals may be analog baseband signals, although the scope of the embodiments is not limited in this respect.
  • the output baseband signals and the input baseband signals may be digital baseband signals.
  • RF circuitry 606 may include analog- to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry
  • baseband circuitry 604 may include a digital baseband interface to communicate with RF circuitry 606.
  • ADC analog- to-digital converter
  • DAC digital-to-analog converter
  • baseband circuitry 604 may include a digital baseband interface to communicate with RF circuitry 606.
  • separate radio integrated circuit (IC) circuitry may be provided for processing signals for one or more spectra, although the scope of the embodiments is not limited in this respect.
  • synthesizer circuitry 606d may be a fractional-N synthesizer or a fractional N/N+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers may be suitable.
  • synthesizer circuitry 606d may be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase- locked loop with a frequency divider.
  • Synthesizer circuitry 606d may be configured to synthesize an output frequency for use by mixer circuitry 606a of RF circuitry 606 based on a frequency input and a divider control input. In some embodiments, synthesizer circuitry 606d may be a fractional N/N+l synthesizer.
  • frequency input may be provided by a voltage controlled oscillator (VCO), although this may be optional.
  • VCO voltage controlled oscillator
  • Divider control input may be provided by either baseband circuitry 604 or applications processor 602 depending on the desired output frequency.
  • a divider control input (e.g., N) may be determined from a look-up table based on a channel indicated by applications processor 602.
  • Synthesizer circuitry 606d of RF circuitry 606 may include a divider, a delay-locked loop (DLL), a multiplexer and a phase accumulator.
  • the divider may be a dual modulus divider (DMD) and the phase accumulator may be a digital phase accumulator (DP A).
  • the DMD may be configured to divide the input signal by either N or N+l, for example based on a carry out, to provide a fractional division ratio.
  • the DLL may include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop.
  • the delay elements may be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line.
  • Nd is the number of delay elements in the delay line.
  • synthesizer circuitry 606d may be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency may be a multiple of the carrier frequency, for example twice the carrier frequency, four times the carrier frequency, and so on, and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other.
  • the output frequency may be a local oscillator (LO) frequency (fLO).
  • RF circuitry 606 may include an in-phase and quadrature (IQ) and/or polar converter.
  • FEM circuitry 608 may include a receive signal path which may include circuitry configured to operate on RF signals received from one or more antennas 710, amplify the received signals and provide the amplified versions of the received signals to the RF circuitry 606 for further processing.
  • FEM circuitry 608 may also include a transmit signal path which may include circuitry configured to amplify signals for transmission provided by RF circuitry 606 for transmission by one or more of the one or more antennas 610.
  • FEM circuitry 608 may include a transmit/receive (TX/RX) switch to switch between transmit mode and receive mode operation.
  • FEM circuitry 608 may include a receive signal path and a transmit signal path.
  • the receive signal path of FEM circuitry 608 may include a low-noise amplifier (LNA) to amplify received RF signals and to provide the amplified received RF signals as an output, for example to RF circuitry 606.
  • the transmit signal path of FEM circuitry 608 may include a power amplifier (PA) to amplify input RF signals, for example provided by RF circuitry 606, and one or more filters to generate RF signals for subsequent transmission, for example by one or more of antennas 610.
  • device 600 may include additional elements such as, for example, memory and/or storage, display, camera, sensor, and/or input/output (I/O) interface, although the scope of the claimed subject matter is not limited in this respect.
  • an apparatus of a user equipment comprises baseband circuitry, including one or more processors, to decode a Radio Resource Control (RRC) message from an evolved Node B (eNB) to obtain information including a transmission time interval (TTI) configuration for the UE to use short TTI, demodulate cell-specific reference signals (CRS) on two CRS antenna ports, port 0 and port 1, out of four CRS antenna ports, port 0, port 1, port 2, and port 3, used by the eNB for CRS transmissions, estimate a channel using the two CRS antenna ports out of the four CRS antenna ports, and encode physical uplink control channel (PUCCH) data or physical uplink shared channel (PUSCH) data to include channel state information (CSI) based on the channel estimate.
  • RRC Radio Resource Control
  • eNB evolved Node B
  • CRS cell-specific reference signals
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the apparatus may include the subject matter of example one or any of the examples described herein, an further may comprise radio frequency (RF) circuitry to receive data from the eNB via on a low latency physical downlink channel via the two antenna ports.
  • RF radio frequency
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink shared channel (L-PDSCH).
  • the apparatus may include the subj ect matter of example one or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink control channel (L-PDCCH).
  • L-PDSCH low latency physical downlink shared channel
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the one or more processors of the baseband circuitry is configured to assume zero power on resource elements corresponding to CRS antenna port 2 and CRS antenna port 3 to receive data on the low latency physical channel.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the data is received from the eNB via CRS antenna port 0 and CRS antenna port 1.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the CSI is estimated for CRS antenna port 0 and CRS antenna port 1.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the data is received from the eNB on orthogonal frequency-division multiplexing (OFDM) symbols of two adjacent downlink subframes.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the data is received from the eNB on a predetermined starting orthogonal frequency-division multiplexing (OFDM) symbol of a subframe.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein a lowest starting orthogonal frequency-division multiplexing (OFDM) symbol of a subframe is configured for the UE via higher layer signaling.
  • OFDM orthogonal frequency-division multiplexing
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the lowest starting OFDM symbol of the subframe is different for Multicast-broadcast single- frequency network (MBSFN) subframes and non-MBSFN subframes.
  • MBSFN Multicast-broadcast single- frequency network
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the lowest starting OFDM symbol of the subframe for an MBSFN is derived from the lowest starting OFDM symbol L of a non-MBSFN subframe as a minimum value between L and 2.
  • the apparatus may include the subject matter of example one or any of the examples described herein, wherein the predetermined starting OFDM symbol of the subframe is OFDM symbol 3 or OFDM symbol 4.
  • an apparatus of an evolved Node B comprises baseband circuitry, including one or more processors, to encode a Radio Resource Control (RRC) message to include information for a transmission time interval (TTI) configuration for a user equipment (UE) to use short TTI, modulate cell-specific reference signals (CRS) on four CRS antenna ports, port 0, port 1, port 2, and port 3, for CRS transmissions, and decode physical uplink control channel (PUCCH) data or physical uplink shared channel (PUSCH) data to include channel state information (CSI) from the UE, wherein the CSI is estimated by the UE for CRS antenna port 0 and CRS antenna port 1.
  • RRC Radio Resource Control
  • TTI transmission time interval
  • CRS cell-specific reference signals
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, and further may comprise radio frequency (RF) circuitry to transmit data to the UE on a low latency physical downlink channel via CRS antenna port 0 and CRS antenna port 1.
  • RF radio frequency
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink shared channel (L-PDSCH).
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink control channel (L-PDCCH).
  • L-PDSCH low latency physical downlink shared channel
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the data is transmitted to the UE on orthogonal frequency-division multiplexing (OFDM) symbols of two adjacent downlink subframes.
  • OFDM orthogonal frequency-division multiplexing
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the data is transmitted to the UE on a predetermined starting orthogonal frequency-division multiplexing (OFDM) symbol of a subframe.
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein a lowest starting orthogonal frequency- division multiplexing (OFDM) symbol of a subframe is configured for the UE via higher layer signaling.
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the lowest starting OFDM symbol of the subframe is different for Multicast-broadcast single-frequency network (MBSFN) subframes and non-MBSFN subframes.
  • MBSFN Multicast-broadcast single-frequency network
  • the apparatus may include the subj ect matter of example fourteen or any of the examples described herein, wherein the lowest starting OFDM symbol of the subframe for an MBSFN is derived from the lowest starting OFDM symbol L of a non-MBSFN subframe as a minimum value between L and 2.
  • the apparatus may include the subject matter of example fourteen or any of the examples described herein, wherein the predetermined starting OFDM symbol of the subframe is OFDM symbol 3 or OFDM symbol 4.
  • one or more computer-readable media may have instructions stored thereon that, if executed by a user equipment (UE), result in decoding a Radio Resource Control (RRC) message from an evolved Node B (eNB) to obtain information including a transmission time interval (TTI) configuration for the UE to use short TTI, demodulating cell-specific reference signals (CRS) on two CRS antenna ports, port 0 and port 1, out of four CRS antenna ports, port 0, port 1, port 2, and port 3, used by the eNB for CRS transmissions, estimating a channel using the two CRS antenna ports out of the four CRS antenna ports, encoding physical uplink control channel (PUCCH) data or physical uplink shared channel (PUSCH) data to include channel state information (CSI) based on the channel estimate, and decoding data from the eNB on a low latency physical downlink channel via the two antenna ports.
  • RRC Radio Resource Control
  • eNB evolved Node B
  • CRS cell-specific reference signals
  • the one or more computer-readable media may include the subject matter of example one or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink shared channel (L-PDSCH) or a low latency physical downlink control channel (L- PDCCH).
  • the one or more computer-readable media may include the subject matter of example one or any of the examples described herein, wherein the data is received from the eNB on orthogonal frequency-division multiplexing (OFDM) symbols of two adjacent downlink subframes.
  • OFDM orthogonal frequency-division multiplexing
  • one or more computer-readable media may have instructions stored thereon that, if executed by an evolved Node B (eNB) result in encoding a Radio Resource Control (RRC) message to include information for a transmission time interval (TTI) configuration for a user equipment (UE) to use short TTI, modulating cell-specific reference signals (CRS) on four CRS antenna ports, port 0, port 1, port 2, and port 3, for CRS transmissions, decoding physical uplink control channel (PUCCH) data or physical uplink shared channel (PUSCH) data to include channel state information (CSI) from the UE, wherein the CSI is estimated by the UE for CRS antenna port 0 and CRS antenna port, and encoding data to be transmitted to the UE on a low latency physical downlink channel via CRS antenna port 0 and CRS antenna port 1.
  • RRC Radio Resource Control
  • the one or more computer-readable media may include the subject matter of example one or any of the examples described herein, wherein the low latency physical downlink channel is a low latency physical downlink shared channel (L-PDSCH) or a low latency physical downlink control channel (L-PDCCH).
  • the one or more computer-readable media may include the subject matter of example one or any of the examples described herein, wherein the data is transmitted to the UE on a predetermined starting orthogonal frequency-division multiplexing (OFDM) symbol of a subframe.
  • OFDM orthogonal frequency-division multiplexing
  • the one or more computer- readable media may include the subject matter of example one or any of the examples described herein, wherein a lowest starting orthogonal frequency-division multiplexing (OFDM) symbol of a subframe is configured for the UE via higher layer signaling.
  • OFDM orthogonal frequency-division multiplexing

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un ou plusieurs modes de réalisation de l'invention, un appareil d'un équipement d'utilisateur comprend un montage de circuits en bande de base comprenant un ou plusieurs processeurs pour décoder un message de gestion des ressources radioélectrique d'un nœud B évolué (eNB) en vue d'obtenir un ou plusieurs éléments d'informations comprenant une configuration d'intervalle de temps de transmission (TTI) court pour l'UE, démoduler des signaux de référence spécifiques à la cellule (CRS) sur deux des quatre ports d'antenne CRS utilisés par l'eNB pour les transmissions de CRS, estimer un canal à l'aide des deux ports d'antenne CRS ; et encoder des données de canal physique de commande de liaison montante ou des données de canal physique partagé de liaison montante afin d'inclure des informations d'état de canal sur la base de l'estimation de canal. L'appareil comprend en outre un montage de circuits radiofréquence pour recevoir des données, de l'eNB, sur un canal physique de liaison descendante à faible latence via les deux ports d'antenne.
PCT/US2016/039980 2016-02-03 2016-06-29 Transmission de canal partagé de liaison descendante physique avec un intervalle de temps de transmission court WO2017135989A1 (fr)

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HK19100650.0A HK1258286A1 (zh) 2016-02-03 2019-01-15 具有短傳輸時間間隔的物理下行鏈路共享信道傳輸

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CN108476121A (zh) 2018-08-31
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