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WO2014126519A1 - Sélection d'une séquence dm-rs basée sur des caractéristiques de canal - Google Patents

Sélection d'une séquence dm-rs basée sur des caractéristiques de canal Download PDF

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Publication number
WO2014126519A1
WO2014126519A1 PCT/SE2013/051155 SE2013051155W WO2014126519A1 WO 2014126519 A1 WO2014126519 A1 WO 2014126519A1 SE 2013051155 W SE2013051155 W SE 2013051155W WO 2014126519 A1 WO2014126519 A1 WO 2014126519A1
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WO
WIPO (PCT)
Prior art keywords
channel
pattern
patterns
transmitting node
available
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.)
Ceased
Application number
PCT/SE2013/051155
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English (en)
Inventor
Meng Wang
Shaohua Li
Stefano Sorrentino
George JÖNGREN
David Hammarwall
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of WO2014126519A1 publication Critical patent/WO2014126519A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L5/003—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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se

Definitions

  • Embodiments herein relate to a transmitting node, a receiving node and methods therein.
  • some embodiments relate to reference signals in a radio communications network.
  • some embodiments herein relate to methods and transmitting nodes (e.g. eNodeBs) for selecting a reference signal (RS) pattern from a plurality of RS patterns based on current channel characteristics, and for transmitting the thus selected RS pattern to a receiving node (e.g., a UE).
  • eNodeBs for selecting a reference signal (RS) pattern from a plurality of RS patterns based on current channel characteristics, and for transmitting the thus selected RS pattern to a receiving node (e.g., a UE).
  • RS reference signal
  • the UMTS is a third generation mobile communication system, which evolved from the second generation (2G) Global System for Mobile
  • the UMTS Terrestrial Radio Access Network is essentially a RAN using Wideband Code Division Multiple Access (WCDMA) and/or High Speed Packet Access (HSPA) for user equipments.
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High Speed Packet Access
  • 3GPP Third Generation Partnership Project
  • the Evolved Packet System comprises the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), also known as the LTE radio access, and the Evolved Packet Core (EPC), also5 known as System Architecture Evolution (SAE) core network.
  • E-UTRAN/LTE is a variant of a 3GPP radio access technology wherein the radio base stations are directly connected to the EPC core network rather than to RNCs.
  • SAE System Architecture Evolution
  • E-UTRAN/LTE is a variant of a 3GPP radio access technology wherein the radio base stations are directly connected to the EPC core network rather than to RNCs.
  • the functions of a RNC are distributed between the radio base stations, e.g., eNodeBs in LTE, and the core network.
  • the RAN of an0 EPS system has an essentially "flat" architecture comprising radio base stations without reporting to RNCs.
  • Orthogonal Frequency Division Multiplexing OFDM time-frequency grid at regular time- frequency positions, i.e. resource elements (RE).
  • RS resource elements
  • a receiver of a user equipment or a radio base station can perform channel estimation for demodulation and other purposes, e.g. acquiring channel state information.
  • mapping procedures are defined
  • the patterns of different types of reference signals are explicitly defined in the specification (see e.g. 3GPP TS 36.21 1 (V.1 1 .1 .0), section 6.10).
  • the reference signals are generally designed to have a sufficiently high density and an optimized or good structure in both time and frequency domains to provide estimates for the entire time-frequency grid in the case of radio channels subject to high frequency and/or time selectivity.
  • the design of RS patterns must take the most challenging channel characteristics into account and thus, high RS overhead and the associate structure design are typically required to guarantee proper demodulation under any channel condition.
  • RS reference o signals
  • embodiments herein are therefore aimed at performing0 adaptive switching between different RS patterns.
  • the RS pattern is solely defined for each type of RS.
  • embodiments herein may provide a plurality of RS patterns for each type of RS, which are specifically designed for different channel characteristics, i.e., different deployments and UE behaviors.
  • the RS pattern for transmission can be adaptively selected, for example, based on the criteria that the system performance is optimized or otherwise improved given the knowledge of current channel characteristics.
  • this disclosure presents a method performed by a transmitting node.
  • the transmitting node may be
  • a reference signal (RS) pattern is selected from a plurality of RS patterns based on current channel characteristics. Also, the selected RS pattern is transmitted to a receiving node.
  • the receiving node may be a user equipment (UE).
  • a demodulation reference signal (DM-RS) pattern is selected from a plurality of DM- RS patterns based on current channel characteristics. Also, the selected DM-RS pattern is transmitted to a receiving node.
  • DM-RS demodulation reference signal
  • a set of available DM-RS patterns is identified. Also, a subset of the set of available DM-RS patterns is identified based on current channel characteristics. Furthermore, one of the available DM-RS patterns from the identified subset is selected.
  • the transmitting node is configured to select the DM- RS pattern based on an estimation of a channel delay spread and/or a channel Doppler spread.
  • a set of available DM-RS patterns may be designed for different5 channel characteristics that are reflected in channel delay spread, and/or channel Doppler spread and/or other parameters related to channel properties.
  • the transmitting node is configured to receive (from the receiving node) a recommendation of a DM-RS pattern to use for a downlink (DL) transmission.
  • the transmitting node may be configured to receive said0 recommendation as part of a Channel State Information (CSI) Reporting, which in addition may involve a Channel Quality Indicator (CQI), a Pre-coding Matrix Indicator (PMI) and/or a Rank Indicator (Rl).
  • CQI Channel Quality Indicator
  • PMI Pre-coding Matrix Indicator
  • Rl Rank Indicator
  • Said recommendation may be based on characteristics of channel delay spread, and/or channel Doppler spread and/or other parameters related to channel properties.
  • the radio communications network may gain flexibility to select the RS patterns (e.g. DM-RS patterns) that achieve the optimal, or at least an improved, balance between RS overhead and receiver performance for different scenarios. In turn, this may lead to further enhancements in overall system performance.
  • Figure 4 is a flowchart of an example method performed by a transmitting node
  • Figure 5 illustrates an example implementation with respect to the selection of a DM-RS pattern from a plurality of DM-RS patterns
  • Figure 6 is a block diagram depicting a transmitting node and a receiving node according to some embodiments herein.
  • user equipment is a non-limiting term which means any wireless terminal, Machine Type Communication (MTC) device or node e.g. Personal Digital Assistant (PDA), laptop, mobile, sensor, relay node, mobile tablet or even a small base station (e.g. pico base station) communicating within respective cell.
  • MTC Machine Type Communication
  • PDA Personal Digital Assistant
  • laptop mobile, sensor, relay node, mobile tablet or even a small base station (e.g. pico base station) communicating within respective cell.
  • pico base station e.g. pico base station
  • the radio communications network 1 comprises a core network node such as a Positioning node 13 for mobility management.
  • a different, or second, radio base station 14 may also be comprised in the radio communications network 1 .
  • the second radio base station 14 may provide radio coverage over a second cell 15, another or a different cell, e.g. a cell neighboring the cell 1 1 .
  • eNodeB may be a transmitting node in the UL and the radio base station may be the transmitting node in the DL.
  • a plurality of RS patterns is available for at least one type of reference signal and for a specific transmission mode and, if applicable, rank.
  • the available RS patterns are known at both eNodeB and UEs.
  • the first and second RS patterns used for transmission are selected from a set of available RS patterns to optimize the0 performance for different channel characteristics.
  • the information about the RS pattern that is (to be) used is part of a Downlink Control Information (DCI) message, in which case it typically applies to a single specific subframe, or is part of a Radio Resource Control (RRC) or Media Access Control (MAC) message, in which case it typically applies until further notice.
  • DCI Downlink Control Information
  • RRC Radio Resource Control
  • MAC Media Access Control
  • the eNodeB receives a recommendation of a RS pattern to use for a DL transmission from said specific UE.
  • said pattern recommendation is part of channel state information (CSI) reporting, which in addition involves a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and/or a Rank Indicator (Rl).
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • Rl Rank Indicator
  • the eNodeB may follow said recommendation for at least one subsequent transmission and may transmit a Physical Downlink Shared Channel (PDSCH) message using said o recommended pattern.
  • PDSCH Physical Downlink Shared Channel
  • recommended RS may be signaled to the UE.
  • the eNodeB determines the RS pattern to be used based on several factors, which could for example include the UE recommendation, measurements performed at UE and reported via uplink, and/or5 a priori deployment information or measurements performed by the eNodeB in the uplink. These measurements may include an estimation of a channel delay spread, channel Doppler spread, or another parameter related to one of these measurements.
  • the eNodeB may explicitly inform the UE (e.g. by signalling a message to the UE) what RS pattern is used for transmission.
  • the RS pattern is referred to DM-RS pattern or CSI- RS pattern.
  • the method is applied in the downlink or the uplink.
  • the eNodeB may select a suitable RS0 pattern based on uplink measurements. Information about the selected RS pattern is then sent to the specific UE.
  • the UE follows the selected RS pattern by eNodeB. /./ eNodeB side - DM-RS patterns
  • FIG. 4A a flowchart of a method 400 performed by a
  • a DM-RS pattern is selected 410 from a plurality of DM-RS patterns.
  • the selection 410 is based on current channel characteristics, or current channel properties.
  • the selected DM-RS pattern is transmitted 420 to a receiving node, such as a UE.
  • a flowchart of an example embodiment of the DM-RS selection 410 is further o detailed.
  • a set of available DM-RS patterns is identified 41 1 .
  • a subset of the set of available DM-RS patterns is identified 412 based on current channel characteristics, or current channel properties.
  • one of the available DM-RS patterns from the identified subset is selected 413.
  • the selection 410 may comprise selecting the DM-RS pattern based on an5 estimation of a channel delay spread. Alternatively, or additionally, the selection 410 may comprise selecting the DM-RS pattern based on a channel Doppler spread. Typically, but not necessarily, a set of available DM-RS patterns is designed for different channel characteristics that are reflected in channel delay spread and/or channel Doppler spread. It should be appreciated that other0 parameters related to channel properties could also be conceivable, e.g. SNR
  • AoD Angle-of- Departure
  • AoA Angle-of-Arrival
  • FIG. 5A illustrates an example implementation on how to5 select 410 a DM-RS pattern
  • Doppler0 Spread Value Range 1 corresponds to a low Doppler spread.
  • the Doppler Spread Value Range 2 corresponds to a high Doppler spread, i.e. a Doppler spread that is comparatively higher than Doppler Spread Value Range 1.
  • Delay Spread Value Range 1 corresponds to a low delay spread.
  • the Delay Spread Value Range 2 corresponds to a comparatively higher delay spread, i.e. a delay spread that is comparatively higher than Delay Spread Value Range 1
  • the maximum channel Doppler spread e.g. highest speed
  • TTI Transmission Time Interval
  • the RS density in the frequency domain can be reduced.
  • the RS density in the frequency domain can be increased.
  • the frequency spacing is generally related to an expected coherence bandwidth of the channel. This is in turn related to the channel delay spread, i.e. the delay spread value.
  • B_c,x% is the bandwidth where the autocorrelation of the channel in the frequency domain is equal to x%, see e.g.
  • a low channel delay spread e.g. Delay Spread Value Range 1
  • the frequency spacing can be enlarged or otherwise increased, e.g. ,
  • the channel For low channel delay spread values, the channel is generally relatively flat in frequency domain. Thus, only few samples must be used to regenerate channels. Similarly, when the channel is with low Doppler spreading, the channel variation in time domain may become smaller. Hence, fewer samples are generally needed to get sufficiently good channel estimation. Or said differently, the coherence bandwidth of the channel is generally inversely proportional to the channel delay spread. With large delay spread, the coherence bandwidth is thus smaller, and vice versa. With large coherence bandwidth, the channel is flat in frequency domain. In other words, the channel does not change much in terms of coherence bandwidth. Furthermore, the required spacing in time domain between reference symbols is generally proportional to the channel Doppler spread. In other words, with smaller Doppler spread less OFDM symbols are generally needed as reference symbols.
  • DM-RS patterns that can be utilized is schematically shown in Figs. 5A-5E.
  • the person skilled in the art appreciates that other DM-RS patterns are equally possible.
  • the exact DM- RS patterns should preferably be tested and evaluated for each specific case in dependence of operator needs, operator demands, end-user needs, end-user demands, system requirements, etcetera.
  • a UE decodes a first PDSCH message in a first subframe using a first RS pattern, and a second PDSCH message, within the same transmission mode and, if applicable, rank, in a second subframe using a second PDSCH pattern. That is, the UE is capable of decoding, for a specific transmission mode and rank, a message using at least two different RS patterns.
  • the RS pattern recommendation may advantageously (but not necessarily) be part of a CSI recommendation, wherein the PMI, Rl and/or CQI is based on the recommended RS pattern.
  • the UE is also configured to receive an indicator for which RS pattern is used in this transmission.
  • the pattern indicator may part of a DCI message following some DCI format.
  • the RS pattern used for current subframe is known.
  • the information regarding RS pattern may need to be decoded on a subframe-to- subframe basis.
  • the pattern indicator may also be contained in RRC or MAC message. In this case, the RS pattern is not updated on a subframe-to-subframe basis. Instead, the UE keeps using the previously decoded RS pattern until further update in RRC or MAC message. In one such embodiment, the UE bases its derivations of CQI on the indicated RS pattern.
  • the method is applied in the downlink or the uplink.
  • the LTE system may gain flexibility to
  • the overhead of reference signals can thus be optimized or otherwise improved according to different channel conditions.
  • the transmitting node may be radio base station or a user equipment.
  • the transmitting node comprises a communication interface e.g. a receiver 401 and a transmitter 402 or a transceiver, configured to transmit a selected reference signal pattern.
  • the transmitting node may select a reference signal pattern out of a plurality of reference signal patterns of a specific type of reference signals, which type may be a CRS, DM-RS, positioning reference signal, a MBSFN reference signal or similar.
  • the transmitting node may adaptively switch the reference signal pattern based on e.g. received recommendation,
  • the transmitting node is configured to select a DM-RS pattern from a plurality of DM-RS patterns based on current channel characteristics.
  • the transmitting node may also be configured to transmit the selected DM-RS pattern to a receiving node.
  • the memory 404 and the computer program code may be configured to, with the processor 403, select a DM-RS pattern from a plurality of DM-RS patterns based on current channel characteristics.
  • the transmitter (or, transceiver) 402 may be configured to transmit the selected DM-RS pattern to a receiving node.
  • the transmitting node may be further configured to identify a set of available DM-RS patterns; identify a subset of the set of available DM-RS patterns based on current channel characteristics; and select one of the available DM-RS patterns from the identified subset.
  • the memory 404 and the computer program code may be configured to, with the processor 403, identify the set of available DM-RS patterns; identify the subset of the set of available DM-RS patterns based on current channel characteristics; and select one of the available DM-RS patterns from the identified subset.
  • the transmitting node may be configured to select the DM-RS pattern based on an estimation of a channel delay spread and/or a channel Doppler spread.
  • the transmitting node may be configured to receive said recommendation as part of a Channel State Information (CSI) Reporting, which in addition may involve a 5 Channel Quality Indicator (CQI), a Pre-coding Matrix Indicator (PMI) and/or a Rank Indicator (Rl).
  • CSI Channel State Information
  • said recommendation may be based on characteristics of channel delay spread, and/or channel Doppler spread and/or other parameters related to channel properties.
  • Embodiments herein also relate to a receiving node configured to receive a o reference signal but may also be configured to recommend a reference signal pattern out of a plurality of reference signal patterns of a specific type of reference signals, which type may be a CRS, DMRS, positioning reference signal, a MBSFN reference signal or similar.
  • the recommendation may be performed in a
  • the receiving node comprises a5 communication interface e.g. a receiver 502 and a transmitter 503 or a
  • the receiving node may further comprise a memory 504.
  • the memory 504 may comprise one or more memory units and may be used to store for example data such as reference signal patterns, CSI, application to perform the methods herein0 when being executed on the transmitting node or similar.
  • processors or “controller” as used herein does not exclusively refer to hardware capable of executing software and may implicitly include, without limitation, digital signal processor (DSP) hardware, read-only memory (ROM) for storing software, random-access memory for storing software and/or program or application data, and non-volatile memory.
  • DSP digital signal processor
  • ROM read-only memory
  • RAM random-access memory
  • non-volatile memory non-volatile memory

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

Abstract

La présente invention concerne des séquences de signal référence (RS). Certains aspects de l'invention concernent un nœud émetteur, comme un eNodeB, qui sélectionne (410) une séquence de signal de référence de démodulation (DM-RS) parmi une pluralité de séquences DM-RS en se basant sur des caractéristiques actuelles de canal. Le nœud émetteur envoie également (420) la séquence de RS ainsi sélectionnée à un nœud récepteur (par ex. un UE).
PCT/SE2013/051155 2013-02-12 2013-10-03 Sélection d'une séquence dm-rs basée sur des caractéristiques de canal Ceased WO2014126519A1 (fr)

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US61/763,488 2013-02-12

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