US20160344519A1 - Method and apparatus for implementing reference signal transmissions in a wireless communication system - Google Patents

Method and apparatus for implementing reference signal transmissions in a wireless communication system Download PDF

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US20160344519A1
US20160344519A1 US15/160,401 US201615160401A US2016344519A1 US 20160344519 A1 US20160344519 A1 US 20160344519A1 US 201615160401 A US201615160401 A US 201615160401A US 2016344519 A1 US2016344519 A1 US 2016344519A1
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cell
trp
transmitted
subframe
transmission
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Ko-Chiang Lin
Richard Lee-Chee Kuo
Yu-Hsuan Guo
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Asustek Computer Inc
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Asustek Computer Inc
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Priority to US15/160,401 priority Critical patent/US20160344519A1/en
Assigned to ASUSTEK COMPUTER INC. reassignment ASUSTEK COMPUTER INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUO, YU-HSUAN, KUO, RICHARD LEE-CHEE, Lin, Ko-Chiang
Publication of US20160344519A1 publication Critical patent/US20160344519A1/en
Priority to US16/227,829 priority patent/US10992439B2/en
Priority to US16/432,141 priority patent/US10985885B2/en
Priority to US17/205,638 priority patent/US11664946B2/en
Priority to US17/213,779 priority patent/US11431456B2/en
Abandoned legal-status Critical Current

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    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
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    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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    • H—ELECTRICITY
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    • H—ELECTRICITY
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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    • H04J—MULTIPLEX COMMUNICATION
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    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • 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

  • This disclosure generally relates to wireless communication networks, and more particularly, to a method and apparatus for implementing reference signal transmissions in a wireless communication system.
  • IP Internet Protocol
  • An exemplary network structure is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN).
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the E-UTRAN system can provide high data throughput in order to realize the above-noted voice over IP and multimedia services.
  • a new radio technology for the next generation e.g., 5G
  • 5G next generation
  • changes to the current body of 3GPP standard are currently being submitted and considered to evolve and finalize the 3GPP standard.
  • the method includes the cell, transmission point (TP), or transmission and reception point (TRP) broadcasting a first RS periodically for measurement, wherein the first RS is transmitted at multiple occasions (or timings) in each period on different beams.
  • the method also includes the cell, TP, or TRP transmitting a second RS to a UE (User Equipment) for PDCCH (Physical Downlink Control Channel) demodulation, wherein the second RS is transmitted on multiple beams in a beam set of the UE in a subframe (or symbol) in which the PDCCH is transmitted.
  • UE User Equipment
  • PDCCH Physical Downlink Control Channel
  • FIG. 1 shows a diagram of a wireless communication system according to one exemplary embodiment.
  • FIG. 2 is a block diagram of a transmitter system (also known as access network) and a receiver system (also known as user equipment or UE) according to one exemplary embodiment.
  • a transmitter system also known as access network
  • a receiver system also known as user equipment or UE
  • FIG. 3 is a functional block diagram of a communication system according to one exemplary embodiment.
  • FIG. 4 is a functional block diagram of the program code of FIG. 3 according to one exemplary embodiment.
  • FIG. 5 is a reproduction of FIGS. 5.1-1 of 3GPP TS 36.300.
  • FIG. 6 is a reproduction of FIGS. 5.1-2 of 3GPP TS 36.300.
  • FIG. 7 is a reproduction of Table 5.1-1 of 3GPP TS 36.300.
  • FIG. 8 is a reproduction of FIG. 6.2 . 2 - 1 of 3GPP TS 36.211.
  • FIG. 9 is a reproduction of Table 6.2.3-1 of 3GPP TS 36.211.
  • FIG. 10 shows a physical subframe structure according to one exemplary embodiment.
  • FIG. 11 is a timing diagram of CRS (Cell-specific Reference Signal) transmissions according to one exemplary embodiment.
  • FIG. 12 is a diagram of CRS and PDCCH transmissions according to one exemplary embodiment.
  • FIG. 13 is a flow chart according to one exemplary embodiment.
  • FIG. 14 is a flow chart according to one exemplary embodiment.
  • FIG. 15 is a message flow diagram according to one exemplary embodiment.
  • FIG. 16 is a block diagram according to one exemplary embodiment.
  • FIG. 17 is a block diagram according to one exemplary embodiment.
  • FIG. 18 is a flow chart according to one exemplary embodiment.
  • FIG. 19 is a flow chart according to one exemplary embodiment.
  • FIG. 20 is a flow chart according to one exemplary embodiment.
  • FIG. 21 is a flow chart according to one exemplary embodiment.
  • Wireless communication systems are widely deployed to provide various types of communication such as voice, data, and so on. These systems may be based on code division multiple access (CDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3GPP LTE (Long Term Evolution) wireless access, 3GPP LTE-A or LTE-Advanced (Long Term Evolution Advanced), 3GPP2 UMB (Ultra Mobile Broadband), WiMax, or some other modulation techniques.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • 3GPP LTE Long Term Evolution
  • 3GPP LTE-A or LTE-Advanced Long Term Evolution Advanced
  • 3GPP2 UMB Ultra Mobile Broadband
  • WiMax Worldwide Interoperability for Mobile communications
  • the exemplary wireless communication systems devices described below may be designed to support the wireless technology discussed in the various documents, including: “DOCOMO 5G White Paper” by NTT Docomo, Inc. and METIS Deliverable D2.4, “Proposed solutions for new radio access”.
  • the exemplary wireless communication systems devices described below may be designed to support one or more standards such as the standard offered by a consortium named “3rd Generation Partnership Project” referred to herein as 3GPP, including: TS 36.300 V12.5.0, “E-UTRA and E-UTRAN Overall description”; 3GPP TS 36.211 V12.5.0, “E-UTRA Physical channels and modulation”; TS 36.331 V12.5.0, “E-UTRA RRC protocol specification”; TS 36.213 V12.3.0, “E-UTRA Physical layer procedures”; and TS 36.321 V12.5.0, “E-UTRA MAC protocol specification”.
  • 3GPP 3rd Generation Partnership Project
  • FIG. 1 shows a multiple access wireless communication system according to one embodiment of the invention.
  • An access network 100 includes multiple antenna groups, one including 104 and 106 , another including 108 and 110 , and an additional including 112 and 114 . In FIG. 1 , only two antennas are shown for each antenna group, however, more or fewer antennas may be utilized for each antenna group.
  • Access terminal 116 is in communication with antennas 112 and 114 , where antennas 112 and 114 transmit information to access terminal 116 over forward link 120 and receive information from access terminal 116 over reverse link 118 .
  • Access terminal (AT) 122 is in communication with antennas 106 and 108 , where antennas 106 and 108 transmit information to access terminal (AT) 122 over forward link 126 and receive information from access terminal (AT) 122 over reverse link 124 .
  • communication links 118 , 120 , 124 and 126 may use different frequency for communication.
  • forward link 120 may use a different frequency then that used by reverse link 118 .
  • antenna groups each are designed to communicate to access terminals in a sector of the areas covered by access network 100 .
  • the transmitting antennas of access network 100 may utilize beamforming in order to improve the signal-to-noise ratio of forward links for the different access terminals 116 and 122 . Also, an access network using beamforming to transmit to access terminals scattered randomly through its coverage causes less interference to access terminals in neighboring cells than an access network transmitting through a single antenna to all its access terminals.
  • An access network may be a fixed station or base station used for communicating with the terminals and may also be referred to as an access point, a Node B, a base station, an enhanced base station, an evolved Node B (eNB), or some other terminology.
  • An access terminal may also be called user equipment (UE), a wireless communication device, terminal, access terminal or some other terminology.
  • FIG. 2 is a simplified block diagram of an embodiment of a transmitter system 210 (also known as the access network) and a receiver system 250 (also known as access terminal (AT) or user equipment (UE)) in a MIMO system 200 .
  • a transmitter system 210 also known as the access network
  • a receiver system 250 also known as access terminal (AT) or user equipment (UE)
  • traffic data for a number of data streams is provided from a data source 212 to a transmit (TX) data processor 214 .
  • TX transmit
  • each data stream is transmitted over a respective transmit antenna.
  • TX data processor 214 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.
  • the coded data for each data stream may be multiplexed with pilot data using OFDM techniques.
  • the pilot data is typically a known data pattern that is processed in a known manner and may be used at the receiver system to estimate the channel response.
  • the multiplexed pilot and coded data for each data stream is then modulated (i.e., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QPSK, M-PSK, or M-QAM) selected for that data stream to provide modulation symbols.
  • the data rate, coding, and modulation for each data stream may be determined by instructions performed by processor 230 .
  • TX MIMO processor 220 The modulation symbols for all data streams are then provided to a TX MIMO processor 220 , which may further process the modulation symbols (e.g., for OFDM). TX MIMO processor 220 then provides N T modulation symbol streams to N T transmitters (TMTR) 222 a through 222 t . In certain embodiments, TX MIMO processor 220 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
  • Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel.
  • N T modulated signals from transmitters 222 a through 222 t are then transmitted from N T antennas 224 a through 224 t , respectively.
  • the transmitted modulated signals are received by N R antennas 252 a through 252 r and the received signal from each antenna 252 is provided to a respective receiver (RCVR) 254 a through 254 r .
  • Each receiver 254 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.
  • An RX data processor 260 then receives and processes the N R received symbol streams from N R receivers 254 based on a particular receiver processing technique to provide N T “detected” symbol streams.
  • the RX data processor 260 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for the data stream.
  • the processing by RX data processor 260 is complementary to that performed by TX MIMO processor 220 and TX data processor 214 at transmitter system 210 .
  • a processor 270 periodically determines which pre-coding matrix to use (discussed below). Processor 270 formulates a reverse link message comprising a matrix index portion and a rank value portion.
  • the reverse link message may comprise various types of information regarding the communication link and/or the received data stream.
  • the reverse link message is then processed by a TX data processor 238 , which also receives traffic data for a number of data streams from a data source 236 , modulated by a modulator 280 , conditioned by transmitters 254 a through 254 r , and transmitted back to transmitter system 210 .
  • the modulated signals from receiver system 250 are received by antennas 224 , conditioned by receivers 222 , demodulated by a demodulator 240 , and processed by a RX data processor 242 to extract the reserve link message transmitted by the receiver system 250 .
  • Processor 230 determines which pre-coding matrix to use for determining the beamforming weights then processes the extracted message.
  • FIG. 3 shows an alternative simplified functional block diagram of a communication device according to one embodiment of the invention.
  • the communication device 300 in a wireless communication system can be utilized for realizing the UEs (or ATs) 116 and 122 in FIG. 1 or the base station (or AN) 100 in FIG. 1 , and the wireless communications system is preferably the LTE system.
  • the communication device 300 may include an input device 302 , an output device 304 , a control circuit 306 , a central processing unit (CPU) 308 , a memory 310 , a program code 312 , and a transceiver 314 .
  • CPU central processing unit
  • the control circuit 306 executes the program code 312 in the memory 310 through the CPU 308 , thereby controlling an operation of the communications device 300 .
  • the communications device 300 can receive signals input by a user through the input device 302 , such as a keyboard or keypad, and can output images and sounds through the output device 304 , such as a monitor or speakers.
  • the transceiver 314 is used to receive and transmit wireless signals, delivering received signals to the control circuit 306 , and outputting signals generated by the control circuit 306 wirelessly.
  • the communication device 300 in a wireless communication system can also be utilized for realizing the AN 100 in FIG. 1 .
  • FIG. 4 is a simplified block diagram of the program code 312 shown in FIG. 3 in accordance with one embodiment of the invention.
  • the program code 312 includes an application layer 400 , a Layer 3 portion 402 , and a Layer 2 portion 404 , and is coupled to a Layer 1 portion 406 .
  • the Layer 3 portion 402 generally performs radio resource control.
  • the Layer 2 portion 404 generally performs link control.
  • the Layer 1 portion 406 generally performs physical connections.
  • the concept of radio access for 5G is described in the DOCOMO 5G White Paper.
  • One key point is to efficiently integrate both lower and higher frequency bands. Higher frequency bands provide opportunities for wider spectrum but have coverage limitations because of higher path loss.
  • the DOCOMO 5G White Paper proposes that 5G system has a two-layer structure that consists of a coverage layer (e.g., consisting of macro cell(s)) and a capacity layer (e.g., consisting of small cell(s) or phantom cell(s)).
  • the coverage layer generally uses existing lower frequency bands to provide basic coverage and mobility.
  • the capacity layer generally uses new higher frequency bands to provide high data rate transmission.
  • the coverage layer could be supported by enhanced LTE RAT (Long Term Evolution Radio Access Technology) while the capacity layer could be supported by a new RAT dedicated to higher frequency bands.
  • LTE RAT Long Term Evolution Radio Access Technology
  • the efficient integration of the coverage and capacity layers is enabled by the tight interworking (dual connectivity) between the enhanced LTE RAT and the new RAT.
  • an eNB may alternatively control multiple transmission points (TPs) or transmission and reception point (TRPs) to form a virtual cell for supporting the capacity layer.
  • TPs transmission points
  • TRPs transmission and reception point
  • Dual connectivity is a mode of operation of a UE in RRC_CONNECTED, configured with a Master Cell Group (i.e., a group of serving cells associated with the MeNB, comprising of the PCell (Primary Cell) and optionally one or more SCells (Secondary Cell)) and a Secondary Cell Group (i.e., a group of serving cells associated with the SeNB, comprising of PSCell (Primary Secondary Cell) and optionally one or more SCells).
  • a Master Cell Group i.e., a group of serving cells associated with the MeNB, comprising of the PCell (Primary Cell) and optionally one or more SCells
  • SCells Secondary Cell Group
  • a UE configured with dual connectivity means that the UE is configured to utilize radio resources provided by two distinct schedulers, located in two eNBs, including MeNB (Master eNB) and SeNB (Secondary eNB) connected via a non-ideal backhaul over the X2 interface. Further details of dual connectivity could be found in 3GPP TS 36.300.
  • cells, TPs, or TRPs on the capacity layer may use beamforming.
  • Beamforming is a signal processing technique used in antenna arrays for directional signal transmission or reception. This is generally achieved by combining elements in a phased array in such a way that signals at particular angles experience constructive interference while others experience destructive interference. Beamforming can be used at both the transmitting and receiving ends in order to achieve spatial selectivity. The improvement compared with omnidirectional reception/transmission is generally known as the receive/transmit gain.
  • Beam forming is frequently applied in radar systems.
  • the beam created by a phased array radar is comparatively narrow and highly agile compared to a moving dish. This characteristic gives the radar the ability to detect small, fast targets like ballistic missiles in addition to aircrafts.
  • U.S. Patent Publication No. 2010/0165914 generally discloses the concept of beam division multiple access (BDMA) based on beamforming technique.
  • BDMA beam division multiple access
  • a base station can communicate with a mobile device via a narrow beam to obtain the receive/transmit gain.
  • two mobile devices in different beams can share the same radio resources at the same time and thus the capacity of a mobile communication system can increase greatly.
  • the base station should know in which beam a mobile device is located.
  • Frame structure in LTE is organized into radio frames and each radio frame (e.g., 10 ms) is divided into ten subframes.
  • Each subframe may include two slots:
  • FIGS. 5 . 1 - 1 Frame Structure Type 1 [is Reproduced as FIG. 5 of the Present Application]
  • Each 10 ms radio frame consists of two half-frames of 5 ms each. Each half-frame consists of eight slots of length 0.5 ms and three special fields: DwPTS, GP and UpPTS.
  • the length of DwPTS and UpPTS is configurable subject to the total length of DwPTS, GP and UpPTS being equal to 1 ms. Both 5 ms and 10 ms switch-point periodicity are supported.
  • Subframe 1 in all configurations and subframe 6 in configuration with 5 ms switch-point periodicity consist of DwPTS, GP and UpPTS.
  • Subframe 6 in configuration with 10 ms switch-point periodicity consists of DwPTS only. All other subframes consist of two equally sized slots.
  • GP is reserved for downlink to uplink transition.
  • Other Subframes/Fields are assigned for either downlink or uplink transmission. Uplink and downlink transmissions are separated in the time domain.
  • FIGS. 5 . 1 - 2 Frame Structure Type 2 (for 5 ms Switch-Point Periodicity) [is Reproduced as FIG. 6 of the Present Application]
  • Each downlink slot includes N sym DL OFDM symbols as shown in the following FIG. 6.2 . 2 - 1 and Table 6.2.3-1 of 3GPP TS 36.211, which are reproduced respectively as FIGS. 8 and 9 of the present application.
  • SFN System Frame Number
  • MasterInformationBlock (as discussed in 3GPP 36.331), to help UEs identify the frame number of a radio frame.
  • MasterInformationBlock not only includes SFN but also other parameters (e.g., dl-Bandwidth and phich-Config) as follows:
  • MasterInformationBlock -- ASN1START MasterInformationBlock SEQUENCE ⁇ dl-Bandwidth ENUMERATED ⁇ n6, n15, n25, n50, n75, n100 ⁇ , phich-Config PHICH-Config, systemFrameNumber BIT STRING (SIZE (8)), spare BIT STRING (SIZE (10)) ⁇ -- ASN1STOP
  • n6 corresponds to 6 resource blocks, n15 to 15 resource blocks and so on.
  • systemFrameNumber Defines the 8 most significant bits of the SFN. As indicated in TS 36.211 [21, 6.6.1], the 2 least significant bits of the SFN are acquired implicitly in the P-BCH decoding, i.e. timing of 40 ms P-BCH TTI indicates 2 least significant bits (within 40 ms P-BCH TTI, the first radio frame: 00, the second radio frame: 01, the third radio frame: 10, the last radio frame: 11).
  • MCG Mobility Management Entity
  • the UE can determine the timing to perform UL (Uplink) transmission, e.g., for SR (Scheduling Request), SRS (Sounding Reference Signal), CSI (Channel State Information) reporting, and/or Random Access Preamble, as discussed in 3GPP TS 36.211, TS 36.331, and TS 36.213.
  • SFN may be used by UE to determine the Active Time for DRX (Discontinuous reception) operation as discussed in 3GPP TS 36.321.
  • MIB is carried by the first four (4) symbols in the second slot of the first subframe in a radio frame as discussed in 3GPP TS 36.211 as follows:
  • the mapping to resource elements (k,l) not reserved for transmission of reference signals shall be in increasing order of first the index k, then the index l in slot 1 in subframe 0 and finally the radio frame number.
  • the resource-element indices are given by
  • mapping operation shall assume cell-specific reference signals for antenna ports 0-3 being present irrespective of the actual configuration.
  • the UE shall assume that the resource elements assumed to be reserved for reference signals in the mapping operation above but not used for transmission of reference signal are not available for PDSCH transmission. The UE shall not make any other assumptions about these resource elements.
  • PSS Primary Synchronization Signal
  • SSS Synchronization Signal
  • the mapping of the sequence to resource elements depends on the frame structure.
  • the UE shall not assume that the primary synchronization signal is transmitted on the same antenna port as any of the downlink reference signals.
  • the UE shall not assume that any transmission instance of the primary synchronization signal is transmitted on the same antenna port, or ports, used for any other transmission instance of the primary synchronization signal.
  • the sequence d(n) shall be mapped to the resource elements according to
  • the primary synchronization signal shall be mapped to the last OFDM symbol in slots 0 and 10.
  • the primary synchronization signal shall be mapped to the third OFDM symbol in subframes 1 and 6.
  • Resource elements (k,l) in the OFDM symbols used for transmission of the primary synchronization signal where
  • the mapping of the sequence to resource elements depends on the frame structure. In a subframe for frame structure type 1 and in a half-frame for frame structure type 2, the same antenna port as for the primary synchronization signal shall be used for the secondary synchronization signal.
  • the sequence d(n) shall be mapped to resource elements according to
  • FIG. 10 A TDD optimized physical subframe structure for a UDN system proposed by METIS Deliverable D2.4 is illustrated in FIG. 10 , which adopts the main design principles listed below:
  • the bi-directional control part of the subframe allows the devices in the network to receive and send control signals, such as scheduling requests (SRs) and scheduling grants (SGs), in every subframe.
  • control signals such as scheduling requests (SRs) and scheduling grants (SGs)
  • SRs scheduling requests
  • SGs scheduling grants
  • the control portion may also contain reference signals (RS) and synchronization signals used for cell detection and selection, scheduling in frequency domain, precoder selection, and channel estimation.
  • RS reference signals
  • CRS cell-specific reference signals
  • UE measurements e.g., Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ)
  • RSRQ Reference Signal Received Quality
  • PDCCH Physical Downlink Control Channel
  • METIS Deliverable D2.4 states: “[i]n addition to the scheduling related control information, the control part in the TDD subframe structure may also contain reference signals (RS) and synchronization signals used for cell detection and selection, scheduling in frequency domain, precoder selection and channel estimation.”
  • RS reference signals
  • the UE transmits its position and speed to the base station and then the base station determines the direction of a downlink beam for the UE according to the received position and speed.
  • the base station may not able to determine the UE's beams accurately, due to the very complicated propagation environment in mobile cellular systems. For example, the line of sight (LOS) between the UE and the base station may be blocked and communication may proceed via other paths (non LOS).
  • LOS line of sight
  • typically not all UEs in a cell are equipped with positioning capability (e.g., low end devices).
  • BDMA Beam Division Multiple Access
  • Other ways for a base station to determine UE's beams could be considered.
  • the maximum number of beams which can be generated by a cell, TP, or TRP at one time could be less than the total number of beams covered by a cell, TP, or TRP e.g. if a hybrid beamformer consisting of an analog beamformer and digital precoding is employed by the cell, TP, or TRP.
  • each time CRS is transmitted on predefined beams i.e. a beam set.
  • predefined beams i.e. a beam set.
  • FIG. 11 there are three (3) beam sets in the cell. In each CRS transmission period, CRS transmission is performed per beam set on all beams in each beam set. Furthermore, it takes three (3) CRS transmissions in one CRS transmission period to complete a round of CRS transmissions for all the beam sets.
  • a UE performs PDCCH demodulation according to channel estimation on CRS (Cell-specific Reference Signal). It is presumed that channel estimation for PDCCH demodulation in a cell, TP, or TRP applying beamforming should be done in beam domain (i.e., a UE needs to detect CRS on those beams used for PDCCH transmission to the UE).
  • CRS Cell-specific Reference Signal
  • CRS is transmitted on beams 1, 2, 3, & 4, while PDCCH is transmitted to the UE on beam 9. Therefore, it is not feasible for UEs to rely on CRS for PDCCH demodulation.
  • a new RS e.g., DMRS
  • One potential way is for the base station to transmit the DMRS in the same subframe (or symbol) in which the PDCCH is transmitted.
  • FIG. 13 is a flow chart 1300 , from the perspective of a cell, transmission point (TP), or transmission and reception point (TRP), in accordance with one exemplary embodiment.
  • the cell, TP, or TRP broadcasts a first RS periodically for measurement, wherein the first RS is transmitted at multiple occasions (or timings) in each period on different beams.
  • the cell, TP, or TRP transmits a second RS to a UE for PDCCH demodulation, wherein the second RS is transmitted on multiple beams in a beam set of the UE in a subframe (or symbol) in which the PDCCH is transmitted.
  • the cell, TP, or TRP communicates with the UE via downlink transmissions and uplink receptions, wherein the downlink transmissions and uplink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.
  • the device 300 includes a program code 312 stored in the memory 310 .
  • the CPU 308 could execute program code 312 to enable the cell, TP, or TRP (i) to broadcast a first RS periodically for measurement, wherein the first RS is transmitted at multiple occasions (or timings) in each period on different beams, and (ii) to transmit a second RS to a UE for PDCCH demodulation, wherein the second RS is transmitted on multiple beams in a beam set of the UE in a subframe (or symbol) in which the PDCCH is transmitted.
  • the CPU could further execute program code 312 to enable the cell, TP, or TRP to communicate with the UE via downlink transmissions and uplink receptions, wherein the downlink transmissions and uplink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • FIG. 14 is a flow chart 1400 from the perspective of a UE in accordance with one exemplary embodiment.
  • the UE performs measurement on a first RS, wherein the first RS is transmitted periodically by the cell, transmission point (TP), or transmission and reception point (TRP) at multiple occasions (or timings) in each period on different beams.
  • the UE receives a second RS for PDCCH demodulation, wherein the second RS is transmitted by the cell, TP, or TRP on multiple beams in a beam set of the UE in a same subframe (or symbol) in which the PDCCH is transmitted.
  • the UE communicates with the cell, TP, or TRP via uplink transmissions and downlink receptions, wherein the uplink transmissions and downlink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.
  • the device 300 includes a program code 312 stored in memory 310 .
  • the CPU 308 could execute program code 312 to enable the UE (i) to receive a second RS for PDCCH demodulation, wherein the second RS is transmitted periodically by the cell, transmission point (TP), or transmission and reception point (TRP) on multiple beams in a beam set of the UE in a same subframe (or symbol) in which the PDCCH is transmitted, and (ii) to receive a second RS for PDCCH demodulation, wherein the second RS is transmitted by the cell, TP, or TRP on multiple beams in a beam set of the UE in a same subframe (or symbol) in which the PDCCH is transmitted.
  • TP transmission point
  • TRP transmission and reception point
  • the CPU could further execute program code 312 to enable the UE to communicate with the cell, TP, or TRP via uplink transmissions and downlink receptions, wherein the uplink transmissions and downlink receptions are organized into radio frames, a radio frame contains multiple subframes, and a subframe contains multiple symbols.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • a total number of beams in the cell, TP, or TRP could be fixed.
  • a direction and a beam width of each beam in the cell, TP, or TRP could be fixed.
  • each subframe in the radio frame could contain a downlink control portion, an uplink control portion, and/or a data portion.
  • the first RS and the second RS are transmitted in the downlink control portion.
  • the downlink transmissions and/or uplink receptions relevant to the UE could be performed by the cell, TP, or TRP on multiple beams in a beam set of the UE.
  • SFN may be used for various purposes.
  • UEs served by a cell, TP, or TRP on the capacity layer may still need to know the SFN of the cell, TP, or TRP.
  • Current MIB Master Information Block
  • PHICH Physical Hybrid ARQ Indicator Channel
  • SFN SFN of the cell, TP, or TRP. Since the UEs connect to the cell, TP, or TRP via dual connectivity, downlink bandwidth and PHICH configuration can be provided via MeNB.
  • SFN cannot be provided via MeNB because SFN is changed time by time, and the two base stations (MeNB and SeNB) are possibly connected via a non-ideal backhaul with not fixed and tolerable delay. Under the circumstance, improvement to efficiently provide the SFN to the UEs served by the cell, TP, or TRP should be considered to reduce control signal overhead of the cell, TP, or TRP.
  • a network node controlling the cell, TP, or TRP could adopt the above improvement(s) to perform corresponding transmission(s).
  • a UE served by the cell, TP, or TRP could also adopt the above improvement(s) to perform corresponding reception(s).
  • FIGS. 15-17 illustrate exemplary embodiments of the invention. Furthermore, in an alternative embodiment, the invention could be applied to the physical subframe structure for a UDN (Ultra Dense Network) shown in FIG. 10 .
  • UDN Ultra Dense Network
  • FIG. 15 is an exemplary embodiment of how UE obtains a SFN as well as a DL bandwidth information of cell 2 controlled by BS (base station) 2 .
  • the DL bandwidth could be provided via cell 1 controlled by BS 1 , e.g., MeNB, in configuration which doesn't include the SFN of cell 2 .
  • the SFN of cell 2 is provided via cell 2 in a signaling which does not include DL bandwidth information of cell 2 .
  • the overhead of the signaling carrying SFN can be reduced.
  • FIG. 16 is an exemplary embodiment of how to signal a SFN.
  • a complete SFN is transmitted in one symbol of a subframe. And the signaling carrying the SFN may not occupy or spread in whole bandwidth. Since only one symbol is used for the SFN omnidirectional transmission or providing the SFN on some beams, the cost to provide SFN can be minimized, and the UE power consumption for the SFN reception can be reduced.
  • FIG. 17 is an exemplary embodiment of how to signal a SFN and a reference signal in one symbol.
  • the SFN is transmitted in a symbol of a subframe where a reference signal is transmitted.
  • the SFN and the reference signal occupy different frequency resource within the symbol.
  • FIG. 18 is a flow chart 1800 in accordance with one exemplary embodiment from the perspective of a network node.
  • the flow chart 1800 generally illustrates a method for a first network node to control a first cell, TP, or TRP.
  • the first network node broadcasts, in the first cell, TP, or TRP, a first signaling indicating a SFN of the first cell, TP, or TRP, wherein the first signaling does not include information related to bandwidth of the first cell, TP, or TRP.
  • the device 300 includes a program code 312 stored in memory 310 of the transmitter.
  • the CPU 308 could execute program code 312 to enable a first network node to broadcast, in a first cell, TP, or TRP, a first signaling indicating a SFN of the first cell, TP, or TRP, wherein the first signaling does not include information related to bandwidth of the first cell, TP, or TRP.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • FIG. 19 is a flow chart 1900 , in accordance with one exemplary embodiment from the perspective of a UE.
  • the UE receives a second signaling, in a second cell, TP, or TRP, indicating information related to bandwidth of a first cell, TP, or TRP.
  • the UE receives a first signaling, in the first cell, TP, or TRP, indicating a SFN of the first cell, TP, or TRP, wherein the first signaling does not include the information related to bandwidth of the first cell, TP, or TRP.
  • the device 300 includes a program code 312 stored in memory 310 of the transmitter.
  • the CPU 308 could execute program code 312 to enable the UE (i) to receive a second signaling, in a second cell, TP, or TRP, indicating information related to bandwidth of a first cell, TP, or TRP, and (ii) to receive a first signaling, in the first cell, TP, or TRP, indicating a SFN of the first cell, TP, or TRP, wherein the first signaling does not include the information related to bandwidth of the first cell, TP, or TRP.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • the first cell, TP, or TRP could be controlled by the first network node.
  • the second cell could be a MCG (Master Cell Group) cell.
  • the second cell, TP, or TRP could be in a coverage layer, and could be controlled by a second network node.
  • the second network node could be a base station or a MeNB.
  • the second signaling could configure the first cell, TP, or TRP as a serving cell, TP, or TRP for the UE.
  • the second signaling could indicate a configuration for PHICH.
  • the UE could be connected to the first cell, TP, or TRP and the second cell, TP, or TRP by dual connectivity (e.g., the first cell, TP, or TRP and the second cell, TP, or TRP are controlled by different network nodes).
  • FIG. 20 is a flow chart 2000 in accordance with one exemplary embodiment from the perspective of a network node.
  • the flow chart 2000 generally illustrates a method for a first network node to control a first cell, TP, or TRP.
  • the first network node broadcasts, in the first cell, TP, or TRP controlled by the first network node, a first signaling indicating a SFN of the first cell, TP, or TRP, wherein the first signaling is transmitted in a symbol of a subframe, and the symbol also carries at least a synchronization signal.
  • the device 300 includes a program code 312 stored in memory 310 of the transmitter.
  • the CPU 308 could execute program code 312 ( i ) to broadcast a first signaling indicating a SFN of a first cell, TP, or TRP controlled by the first network node, wherein the first signaling is transmitted in a symbol of a subframe, and the symbol also carries at least a synchronization signal.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • FIG. 21 is a flow chart 2100 in accordance with one exemplary embodiment from the perspective of a UE.
  • the UE receives, in a first cell, TP, or TRP, a first signaling indicating a SFN of the first cell, TP, or TRP, wherein the first signaling is transmitted in a symbol of a subframe, and the symbol also carries at least a synchronization signal.
  • the device 300 includes a program code 312 stored in memory 310 of the transmitter.
  • the CPU 308 could execute program code 312 to enable the UE to receive, in a first cell, TP, or TRP, a first signaling indicating a SFN of the first cell, TP, or TRP, wherein the first signaling is transmitted in a symbol of a subframe, and the symbol also carries at least a synchronization signal.
  • the CPU 308 can execute the program code 312 to perform all of the above-described actions and steps or others described herein.
  • the UE could also receive the synchronization signal in the same symbol of the subframe.
  • the synchronization signal could occupy more than one symbol of the subframe.
  • the synchronization signal only occupies the symbol of the subframe, i.e., the complete synchronization signal can be transmitted in one symbol.
  • the first signaling could occupy more than one symbol of the subframe.
  • the first signaling only occupies the symbol of the subframe, i.e., the complete first signaling can be transmitted in one symbol.
  • the symbol could include a field to convey the first signaling.
  • the first signaling and the synchronization signal could have different transmission periodicities.
  • the transmission periodicity of the first signaling could be larger than transmission periodicity of the synchronization signal.
  • Transmission periodicity of the first signaling could be a multiple of transmission periodicity of the synchronization signal.
  • transmission periodicity of the first signaling is equal to transmission periodicity of the synchronization signal.
  • the symbol could be for beam forming or for omnidirectional transmission.
  • the symbol could be an OFDM (Orthogonal Frequency Division Multiplexing) symbol.
  • the symbol could be the first symbol in a subframe, the last symbol in a subframe, or the last symbol in a control region (or control portion) of a subframe.
  • the synchronization signal could be a PSS (Primary Synchronization Signal) or a SSS (Secondary Synchronization Signal).
  • the first signaling does not indicate configuration for PHICH.
  • the first signaling could indicate the SFN only but no other configuration.
  • the first signaling could be a system information, a MasterInformationBlock, a Random Access Response, or a MAC (Medium Access Control) control element.
  • the first signaling could be broadcasted, transmitted periodically, transmitted by beam forming, and/or transmitted in the control region (or control portion) of a subframe.
  • the transmission of the first signaling could be omnidirectional.
  • the first signaling could indicate partial bits of the SFN, n most significant bits of the SFN, or all bits of the SFN.
  • the first network node could be a base station, or a SeNB.
  • the first cell could be a SCG cell and/or could be in the capacity layer.
  • concurrent channels may be established based on pulse repetition frequencies.
  • concurrent channels may be established based on pulse position or offsets.
  • concurrent channels may be established based on time hopping sequences.
  • concurrent channels may be established based on pulse repetition frequencies, pulse positions or offsets, and time hopping sequences.
  • the various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within or performed by an integrated circuit (“IC”), an access terminal, or an access point.
  • the IC may comprise a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute codes or instructions that reside within the IC, outside of the IC, or both.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module e.g., including executable instructions and related data
  • other data may reside in a data memory such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of computer-readable storage medium known in the art.
  • a sample storage medium may be coupled to a machine such as, for example, a computer/processor (which may be referred to herein, for convenience, as a “processor”) such the processor can read information (e.g., code) from and write information to the storage medium.
  • a sample storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in user equipment.
  • the processor and the storage medium may reside as discrete components in user equipment.
  • any suitable computer-program product may comprise a computer-readable medium comprising codes relating to one or more of the aspects of the disclosure.
  • a computer program product may comprise packaging materials.

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US16/432,141 US10985885B2 (en) 2015-05-22 2019-06-05 Method and apparatus for implementing reference signal transmissions in a wireless communication system
US17/205,638 US11664946B2 (en) 2015-05-22 2021-03-18 Method and apparatus for implementing reference signal transmissions in a wireless communication system
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