1111111111111111 IIIIII IIIII 1111111111 11111 11111 1111111111 1111111111 11111 1111111111 11111111
`US 20200015200Al
`
`c19) United States
`c12) Patent Application Publication
`VILAIPORNSAWAI et al.
`
`c10) Pub. No.: US 2020/0015200 Al
`Jan. 9, 2020
`(43) Pub. Date:
`
`(54) METHOD AND SYSTEM FOR ENHANCING
`DATA CHANNEL RELIABILITY USING
`MULTIPLE TRANSMIT RECEIVE POINTS
`
`(52) U.S. Cl.
`CPC ......... H04W 721042 (2013.01); H04L 510048
`(2013.01)
`
`(71) Applicant: Huawei Technologies Co., Ltd.,
`Shenzhen (CN)
`
`(72)
`
`Inventors: USA VILAIPORNSAWAI, NEPEAN
`(CA); MOHAMMADHADI BALIGH,
`OTTAWA (CA); YONGXIA LYU,
`OTTAWA (CA)
`
`(21) Appl. No.: 16/028,204
`
`(22) Filed:
`
`Jul. 5, 2018
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`H04W72/04
`H04L 5100
`
`(2006.01)
`(2006.01)
`
`ABSTRACT
`(57)
`Devices and methods are provided for receiving a first
`indication and a second indication, the first indication asso(cid:173)
`ciated with a first set of transmission parameter information
`for a first repetition of data received in a Physical Downlink
`Shared Channel (PDSCH) and the second indication asso(cid:173)
`ciated with a second set of transmission parameter informa(cid:173)
`tion for a second repetition of data received in the PDSCH.
`Each set of transmission parameter information corresponds
`to a Quasi-Co-Location (QCL) information for the respec(cid:173)
`tive repetition of data. In addition, the method involves
`receiving a first PDSCH repetition and a second PDSCH
`repetition. A channel estimate can then be performed for the
`first PDSCH repetition based on the QCL information for the
`first PDSCH repetition and a channel estimate for the second
`PDSCH repetition based on the QCL information for the
`second PDSCH repetition.
`
`120a
`
`r--170a
`
`BASE
`STATION
`
`120b
`
`1 170b
`BASE
`STATION
`
`110~ ~----
`
`110~
`~
`
`110~
`~
`
`r100
`
`-- 150
`
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`Patent Application Publication
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`Jan. 9, 2020 Sheet 1 of 11
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`US 2020/0015200 Al
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`r100
`
`-- 150
`
`120a
`
`r-170a
`BASE
`STATION
`
`120b
`
`1 170b
`BASE
`STATION
`
`110~ ~----
`
`110~
`~
`
`110~
`~
`
`FIG.1
`
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`Patent Application Publication
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`Jan. 9, 2020 Sheet 2 of 11
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`Air Interface Manager
`200
`
`F""'
`
`............................................................................................................... ........
`
`1
`
`!: I
`
`Frame Structure
`210
`
`I 1:1
`
`:
`!
`
`:
`I
`....................................................................................................................... .....l!
`
`Numerology
`230
`
`Multiple Access Scheme
`215
`
`Protocol
`220
`
`Coding & Modulation
`225
`
`FIG. 2
`
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`Jan. 9, 2020 Sheet 3 of 11
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`110
`
`- ~
`
`-
`
`304
`
`Transceiver
`302
`
`Input/ Output
`306
`
`-
`
`Processing Unit
`300
`
`Memory
`308
`
`FIG. 3A
`
`Scheduler
`353
`
`190
`~ 35 6
`
`170
`
`Input / Output
`366
`
`-
`
`Processing
`Unit
`350
`
`-
`
`-
`
`-
`
`TX
`352
`I
`RX
`354
`I
`Memory
`358
`
`FIG. 3B
`
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`..___T_C_I s_ta_te_1 _ __,___r_c_1 _s_ta_te_2_.I
`
`I TCI StateN
`
`TCI Field in DCI
`
`FIG.4
`
`.____AP_1 _ __._ __ P.P_2 _
`
`__.I
`
`I.____A_P_N _
`
`__,
`
`Antenna Port Field in DCI
`
`FIG. 5
`
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`Patent Application Publication
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`Jan. 9, 2020 Sheet 5 of 11
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`TC!
`TCI
`Configuration Pattern
`TCIState1D1 1 TCIState!D2
`0
`1
`TCIState1D2, TCIState1D3
`TCIState1D1, TCIState1D3, TCIState!D2
`2
`TCIState1D1 I TCIState!D1, TCIStatelD2, TCIState1D2
`3
`FIG~ 6A
`
`AP
`AP
`Configuration Pattern
`AP value1, AP va!ue2
`0
`1
`AP value2, AP value3
`2
`AP value1, AP value3, AP value2
`AP value1, AP value1, AP value2, AP value2
`3
`FIG. 6B
`
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`

`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ .....
`
`(')
`
`('D = .....
`~ .....
`""O
`
`> ....
`
`0
`0
`N
`Ul
`
`N
`0
`N
`rJJ
`c
`
`0 ....
`0 --- 0
`
`....
`....
`0 ....
`O'I
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`0
`N
`0
`N
`~\,Ci
`
`?
`~
`~
`
`~ .....
`
`(')
`
`AP value2, AP value3
`
`AP value1, AP value2
`
`Pattern
`AP
`
`:FIG. 7
`
`TCI Field in DCI
`
`TCI Field in DCI
`
`I TCI State Configuration I I AP Pattern Configuration I
`
`FIG. 6C
`
`TCIState1D1, TCIState1D1, TCIState1D2, TCIState1D2 AP value1, AP value1, AP value2J AP value2
`
`AP value1, AP value3J AP value2
`
`TCIState1D1 J TCIState1D3, TCIState1D2
`
`TCIState1D2, TCIState1D3
`
`TCIState1D1, TC!State1D2
`
`Configuration Pattern
`TCI
`
`TCI
`
`3
`
`2
`
`1
`
`0
`
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`00
`i8 C,
`~
`~
`
`N
`t::
`8.
`~
`
`~
`
`t::
`0 a.
`~
`
`I
`0 en
`0
`CL
`
`I
`0 en
`0
`CL
`
`I
`0 en
`0
`Cl.
`
`0
`en
`
`z
`.+
`0
`en
`
`~ .+
`0
`en
`
`Ex.1015
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`Patent Application Publication
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`900
`~
`
`( Start
`+
`Receiving a first indication and a second indication,
`the first indication associated with a first set of
`transmission parameter information for a first
`repetition of data received in a Physical Downlink
`Shared Channel (PDSCH) and the second indication
`associated with a second set of transmission
`parameter information for a second repetition of data
`received in the POSCH, wherein each set of
`transmission parameter information corresJ:?onds to a
`Quasi-Co-Location (QCL{ assumption for the
`respective repeti ion of data
`+
`Receiving a first POSCH repetition and a second
`POSCH repetition
`+
`Performing a channel estimate for the first POSCH
`re~etition based on the QCL assumption for the first
`OSCH r~tition and a channel estimate for the
`second DSCH repetition based on the QCL
`assumption for the second POSCH repetition
`~
`( End
`
`)
`
`FIG. 9
`
`r,...,, 910
`
`r,...,, 920
`
`r"--' 930
`
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`Patent Application Publication
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`Jan. 9, 2020 Sheet 9 of 11
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`__ Rv_1 ____ Rv_2 __ I _I __ Rv_N __
`
`TCI Field in DCI
`
`FIG.10
`
`RV
`RV
`Configuration Pattern
`RV value1, RV value2
`0
`1
`RV value2, RV value3
`2
`RV va!ue1, RV value3l RV value2
`RV value1, RV value1, RV value2, RV value2
`3
`
`FIG.11
`
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`__ M_c_s_1 ___ M_c_s2 __ 1 _I _M_c_sN __
`
`MCS Field in DC!
`
`FIG.12
`
`MCS
`MCS
`Configuration Pattern
`MCS value1, MCS value2
`0
`MCS value2, MCS value3
`1
`2
`MCS value1, MCS value3, MCS value2
`MCS value1, MCS value1, MCS value2, MCS value2
`3
`
`FIG.13
`
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`Patent Application Publication
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`___ □_M_R_s_1 _ _.__ __ 0M_Rs_2 _ _.I
`
`l.____□_M_R_s_N _ __.
`
`DMRS Field in DCI
`
`FIG.14
`
`DMRS
`DMRS
`Configuration Pattern
`DMRS value1, DMRS value2
`0
`DMRS value2, DMRS value3
`1
`2
`DMRS value1, DMRS value3, DMRS value2
`DMRS value1, DMRS value1, MDMRS value2, DMRS value2
`3
`
`FIG.15
`
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`US 2020/0015200 Al
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`Jan. 9, 2020
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`1
`
`METHOD AND SYSTEM FOR ENHANCING
`DATA CHANNEL RELIABILITY USING
`MULTIPLE TRANSMIT RECEIVE POINTS
`
`TECHNICAL FIELD
`
`[0001] The present invention relates generally to a system
`and method for wireless communications, and, in particular
`embodiments, to a system and method for enhancing data
`channel reliability using multiple transmit receive points
`(TRPs).
`
`BACKGROUND
`
`[0002] An air interface is the wireless communications
`link between two or more communicating devices, such as
`a radio access network device ( e.g., a base station, a NodeB,
`an evolved NodeB, a transmit point) and an electronic
`device (ED) (e.g., a user equipment (UE), a mobile phone,
`a sensor, a camera). Typically, both communicating devices
`need to know specific parameters of the air interface in order
`to successfully transmit and receive a transmission.
`In 3GPP NR Release 15 (R15), a physical down(cid:173)
`[0003]
`link shared channel (PDSCH) repetition for PDSCH with
`only one layer is supported. PDSCH repetition is intended to
`improve PDSCH reliability. However, the manner in which
`the mechanism is agreed to operate only allows the repeti(cid:173)
`tions to be transmitted from the same transmit receive point
`(TRP) or beam. This is at least in part because there is only
`one quasi-co-location (QCL)
`information between the
`demodulation reference signal (DMRS) port or port group of
`the PDSCH, which is used for channel estimation, and a
`reference signal (RS) that is associated with an RS antenna
`port. QCL indicates a relationship between two RSs, and a
`specified set of channel parameters, for use in relation to ED
`channel estimation based on one of the two RSs. Related
`parameters such as Doppler shift, Doppler spread, average
`delay, and delay spread, can be derived from RS. However,
`in coordinated multipoint (CoMP) scenarios, multiple chan(cid:173)
`nel state information (CSI) processes can be configured for
`the ED to receive multiple CSI-RS from multiple transmis(cid:173)
`sion points (TPs ), and the demodulation and timing refer(cid:173)
`ence for PDSCH may change dynamically. In such sce(cid:173)
`narios, QCL signalling may be used, to let the ED know
`which CSI-RS to use to derive the timing reference. There(cid:173)
`fore, when a QCL information is configured for the DMRS
`port or port group and the RS port, the DMRS port can use
`the Doppler shift that has already been obtained by the RS
`port.
`[0004] QCL information is defined in a transmission con(cid:173)
`trol indication (TCI) state that is configured by transmission
`of a higher layer parameter. The QCL assumption between
`the DMRS port or port group of the PDSCH and the RS port
`can be used by the ED when the ED is performing channel
`estimation for a link between a TRP and an ED. Channel
`estimation is performed by using received DMRSs and
`determining how the DMRS changes due to channel effects.
`The ED can utilize the QCL information defined between the
`DMRS of the PDSCH, which is associated with a DMRS
`port, and the RS, which is associated with a RS antenna port,
`when performing channel estimation, and use channel
`parameters (e.g. any of Doppler shift, Doppler spread,
`average delay, delay spread, Spatial Rx parameter) in the
`defined QCL information that have already obtained from
`
`the RS. Then the channel estimate is used in demodulating
`PDSCH received in the port(s) that is the same as DMRS
`port(s) of PDSCH.
`In R15, the number of PDSCH repetitions is con(cid:173)
`[0005]
`figured by a higher layer parameter, namely pdsch-Aggre(cid:173)
`gationFactor, having possible values of 2, 4 or 8. TS38.214
`states "when the UE is configured with aggregationFac(cid:173)
`torDL> 1, the same symbol allocation is applied across the
`aggregationFactorDL consecutive slots. The UE may expect
`that the TB is repeated within each symbol allocation among
`each of the aggregationFactorDL consecutive slots and the
`PDSCH is limited to a single transmission layer."
`[0006] The R15 mechanism for supporting multiple
`PDSCH repetitions mentioned above has drawbacks. As
`agreed upon in R15, DCI is transmitted once for all PDSCH
`repetitions. Only one TCI state is defined in the DCI. The
`one TCI state has only one QCL information. Because a
`QCL information defines channel parameters associated
`with a channel for a particular transmission point or beam,
`if there is only one QCL information, all repetitions are
`considered to be transmitted from one TRP or one beam.
`[0007] Accordingly, there is a desire for an improved
`method of supporting multiple PDSCH repetitions received
`from multiple TRPs or multiple beams.
`
`SUMMARY
`
`[0008] Technical advantages are generally achieved by
`embodiments of this disclosure which describe a system and
`method for providing higher PDSCH reliability by exploit(cid:173)
`ing link diversity by transmitting different PDSCH repeti(cid:173)
`tions from multiple TRPs.
`[0009] According to an aspect of the present disclosure,
`there is provided a method for a user equipment (UE)
`involving: receiving a first indication and a second indica(cid:173)
`tion, the first indication associated with a first set of trans(cid:173)
`mission parameter information for a first repetition of data
`received in a Physical Downlink Shared Channel (PDSCH)
`and the second indication associated with a second set of
`transmission parameter information for a second repetition
`of data received in the PDSCH, wherein each set of trans(cid:173)
`mission parameter information corresponds to a Quasi-Co(cid:173)
`Location (QCL) information for the respective repetition of
`data; receiving a first PDSCH repetition and a second
`PDSCH repetition; and performing a channel estimate for
`the first PDSCH repetition based on the QCL information for
`the first PDSCH repetition and a channel estimate for the
`second PDSCH repetition based on the QCL information for
`the second PDSCH repetition.
`In some embodiments, receiving the first indication
`[0010]
`and the second indication involves receiving the first and
`second indications by one of: dynamic signaling using
`downlink control information (DCI); a combination of semi(cid:173)
`static signaling using higher layer signaling and dynamic
`signaling; a combination of using a predefined set of con(cid:173)
`figurations and dynamic signaling to select a particular
`configuration of the set of configurations; and a predefined
`set of indications either known to the UE or signaled using
`higher layer signaling.
`In some embodiments, receiving the first indication
`[0011]
`and the second indication involves receiving the first and
`second indications in a DCI; wherein the DCI has one of the
`following formats: format (1_0); format (1_1); and a format
`similar to format (1_1), but with a smaller payload.
`
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`
`2
`
`[0012]
`In some embodiments, receiving the first and sec(cid:173)
`ond indication by dynamic signaling using DCI involves
`receiving a plurality of transmission configuration indica(cid:173)
`tions (TCis), each TCI identifying a TCI state that indicates
`the QCL information for a respective PDSCH repetition.
`[0013]
`In some embodiments, the number ofTCis is equal
`to a total number of PDSCH repetitions, and each TCI is
`associated with a respective PDSCH repetition.
`[0014]
`In some embodiments, the number of TCis is less
`than a total number of PDSCH repetitions, and a pattern of
`TCis associated with the PDSCH repetitions is repeated
`partially, or more than once, to correspond to the total
`number of PDSCH repetitions.
`[0015]
`In some embodiments, the number of TCis is
`greater than a total number of PDSCH repetitions, and the
`TCis are used in an order received for each PDSCH repeti(cid:173)
`tion until all of the PDSCH repetitions are received.
`[0016]
`In some embodiments, receiving the first and sec(cid:173)
`ond indications by dynamic signaling using DCI involves:
`receiving a plurality of antenna port (AP) or AP group
`configuration indications, each AP or AP group configura(cid:173)
`tion indication being associated with a transmission con(cid:173)
`figuration indication (TCI) state that indicates a QCL infor(cid:173)
`mation for a respective PDSCH repetition.
`[0017]
`In some embodiments, the number of AP or AP
`group configuration indications is equal to a number of TCI
`states, and each AP or AP group configuration indication
`being associated with a respective TCI.
`[0018]
`In some embodiments, the number of AP or AP
`group configuration indications is less than a number of TCI
`states; if there is only one AP or AP group configuration
`indication, the same AP or AP group configuration indication
`is used for each TCI state; and if there is more than one AP
`or AP group configuration indication, an association
`between the more than one AP or AP group configuration
`indication and the TCI states is received.
`[0019]
`In some embodiments, the number of AP or AP
`group configuration indications is greater than a total num(cid:173)
`ber of PDSCH repetitions, and the TCI states are configured
`in an order received for each respective PDSCH repetition
`until all of the PDSCH repetitions are received.
`[0020]
`In some embodiments, receiving the first indication
`and the second indication involves receiving a plurality of
`TCI state pattern configurations, a plurality of AP or AP
`group pattern configurations, or a plurality of combinations
`of TCI state pattern configurations and AP or AP group
`pattern configurations by higher layer signaling.
`[0021]
`further
`In some embodiments,
`the method
`involves: receiving a media access control (MAC) control
`element (CE) to activate at least one TCI state pattern
`configuration, at least one AP or AP group pattern configu(cid:173)
`ration, or at least one combination of a TCI state pattern
`configuration and an AP or AP group pattern configuration.
`[0022]
`In some embodiments,
`the method
`further
`involves: receiving an indication that a TCI state is included
`in a DCI to be received by the UE; and receiving in the DCI
`at least one of: at least one indication of a TCI state for a
`respective PDSCH repetition; at least one indication of a
`TCI state pattern that indicates a particular TCI pattern
`configuration, an AP or AP group pattern that indicates a
`particular a AP or AP group pattern configuration, or at least
`one combination of a TCI state pattern configuration and an
`
`AP or AP group pattern configuration that indicates a par(cid:173)
`ticular TCI pattern configuration and AP or AP group pattern
`configuration.
`[0023]
`In some embodiments, the at least one indication is
`an index of a table or list, and the index is associated with
`the particular TCI pattern configuration, the particular AP or
`AP group pattern configuration, or the particular combina(cid:173)
`tion of TCI state pattern configuration and AP or AP group
`pattern configuration.
`[0024]
`In some embodiments, receiving the first indication
`and the second indication involves: receiving an identifica(cid:173)
`tion of a TCI state pattern for identifying a particular TCI
`state pattern from a plurality of predefined TCI state patterns
`on the UE, each TCI state pattern identifying a set of TCI
`states, each TCI state corresponding to a QCL information
`for one of the PDSCH repetitions.
`[0025]
`In some embodiments, receiving the indication for
`each of two or more QCL informations involves: receiving
`a plurality of AP or AP group pattern configurations by
`higher layer signaling; receiving in the DCI at least one of:
`at least one indication of an AP configuration corresponding
`to an AP or AP group pattern, each AP or AP group pattern
`associated with TCI states for PDSCH repetitions.
`[0026]
`In some embodiments, the method further involves
`receiving a media access control (MAC) control element
`(CE) to activate at least one AP or AP group pattern
`configuration of the plurality of AP or AP group pattern
`configurations.
`[0027]
`In some embodiments, the method further involves
`receiving an indication that a TCI is included in a received
`DCI.
`[0028]
`In some embodiments, receiving the indication for
`each of two or more QCL informations involves: receiving
`an antenna port (AP) pattern indication identifying a par(cid:173)
`ticular AP or AP group pattern from a plurality of predefined
`AP or AP group patterns, each AP or AP group pattern
`associated with a TCI state pattern for the PDSCH repeti(cid:173)
`tions.
`[0029]
`In some embodiments, multiple reference signal
`(RS) ports associated with a TCI state are associated with at
`least one DMRS port or DMRS port group.
`[0030]
`In some embodiments, the RS ports are at least one
`of: phase tracking reference signal (PT-RS) ports; channel
`state information reference signal (CSI-RS) ports; and syn(cid:173)
`chronization signal block (SSB) ports.
`[0031]
`In some embodiments, the method further involves
`receiving an indication of a first instance of a transmission
`parameter and a second instance of a transmission param(cid:173)
`eter, the first and second instances of the transmission
`parameters associated with a respective PDSCH repetition.
`[0032]
`In some embodiments, the transmission parameter
`is at least one of: redundancy version (RV); modulation
`order; and DMRS sequence initialization.
`[0033]
`further
`In some embodiments,
`the method
`involves: for a second signal transmitted at the transmitter
`end of the communication system on a second transmission
`layer, receiving an indication for each of two or more QCL
`informations, each QCL information associated with either
`a respective first PDSCH transmission or at least one
`PDSCH repetition of the second signal; and receiving the
`first PDSCH transmission of the second signal or the at least
`one PDSCH repetition of the second signal based at least in
`part on the QCL information associated with the first
`
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`
`3
`
`PDSCH transmission of the second signal or the at least one
`PDSCH repetition of the second signal.
`[0034] According to an aspect of the present disclosure,
`there is provided a user equipment (UE) including at least
`one antenna; a processor; and a processor readable medium.
`The processor readable medium has stored thereon proces(cid:173)
`sor executable instructions that when executed cause the
`processor to: receive a first indication and a second indica(cid:173)
`tion, the first indication associated with a first set of trans(cid:173)
`mission parameter information for a first repetition of data
`received in a Physical Downlink Shared Channel (PDSCH)
`and the second indication associated with a second set of
`transmission parameter information for a second repetition
`of data received in the PDSCH, wherein each set of trans(cid:173)
`mission parameter information corresponds to a Quasi-Co(cid:173)
`Location (QCL) information for the respective repetition of
`data; receive a first PDSCH repetition and a second PDSCH
`repetition; and perform a channel estimate for the first
`PDSCH repetition based on the QCL information for the first
`PDSCH repetition and a channel estimate for the second
`PDSCH repetition based on the QCL information for the
`second PDSCH repetition.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0035] For a more complete understanding of the present
`invention, and the advantages thereof, reference is now
`made to the following description taken in conjunction with
`the accompanying drawings, in which:
`[0036] FIG. 1 is a network diagram of a communication
`system.
`[0037] FIG. 2 is a block diagram of an air interface
`manager for configuring a software-configurable air inter(cid:173)
`face.
`[0038] FIG. 3A is a block diagram of an example client
`side electronic device.
`[0039] FIG. 3B is a block diagram of an example radio
`access network device device.
`[0040] FIG. 4 is a block diagram illustrating an example of
`multiple transmission control indications (TCis) in a TCI
`field included in downlink control
`information (DCI)
`according to an aspect of the disclosure.
`[0041] FIG. 5 is a block diagram illustrating an example of
`multiple antenna port (AP) indications in an AP field
`included in DCI according to an aspect of the disclosure.
`[0042] FIG. 6A is an example table illustrating TCI state
`patterns with associated configuration indices according to
`an aspect of the disclosure.
`[0043] FIG. 6B is an example table illustrating AP patterns
`with associated configuration indices according to an aspect
`of the disclosure.
`[0044] FIG. 6C is an example table illustrating combined
`TCI state patterns and AP patterns with associated configu(cid:173)
`ration indices according to an aspect of the disclosure.
`[0045] FIG. 7 is a block diagram illustrating an example of
`TCI state configuration information in a TCI field and AP
`pattern configuration information in an AP field that are
`included in DCI according to an aspect of the disclosure.
`[0046] FIG. 8 is a block diagram illustrating an example of
`associations between physical downlink shared channel
`(PDSCH) repetitions and phase tracking reference signal
`(PTRS) ports in various slots according to an aspect of the
`disclosure.
`
`[0047] FIG. 9 is a flow chart describing a method for use
`by an electronic device (ED) in allocating a transmission
`resource.
`[0048] FIG. 10 is a block diagram illustrating an example
`of redundancy version (RV) information in a RV field
`included in DCI according to an aspect of the disclosure.
`[0049] FIG. 11 is a table illustrating RV patterns and
`associated configuration indices according to an aspect of
`the disclosure.
`[0050] FIG. 12 is a block diagram illustrating an example
`of modulation order information in a modulation and coding
`scheme (MCS) field included in DCI according to an aspect
`of the disclosure.
`[0051] FIG. 13 is a table illustrating MCS patterns and
`associated configuration indices according to an aspect of
`the disclosure.
`[0052] FIG. 14 is a block diagram illustrating an example
`of a demodulation reference signal (DMRS) sequence ini(cid:173)
`tialization indication in a DMRS field included in DCI
`according to an aspect of the disclosure.
`[0053] FIG. 15 is a table illustrating DMRS sequence
`initialization indication patterns and associated configura(cid:173)
`tion indices according to an aspect of the disclosure.
`[0054] Corresponding numerals and symbols in the dif(cid:173)
`ferent figures generally refer to corresponding parts unless
`otherwise indicated. The figures are drawn to clearly illus(cid:173)
`trate the relevant aspects of the embodiments and are not
`necessarily drawn to scale.
`
`DETAILED DESCRIPTION OF ILLUSTRATIVE
`EMBODIMENTS
`
`[0055] The structure, manufacture and use of the presently
`preferred embodiments are discussed in detail below. It
`should be appreciated, however, that the present invention
`provides many applicable inventive concepts that can be
`embodied in a wide variety of specific contexts. The specific
`embodiments discussed are merely illustrative of specific
`ways to make and use the invention, and do not limit the
`scope of the invention.
`[0056] Aspects of the present disclosure provide mecha(cid:173)
`nisms to inform an electronic device, such as a user equip(cid:173)
`ment (UE), of multiple QCL information, thereby allowing
`a repetition of physical downlink shared channel (PDSCH)
`information to be transmitted from multiple transmit receive
`points (TRPs) or beams from one or more TRPs. More
`generally, the present disclosure provides mechanisms to
`inform the UE of various different transmission parameters
`used for configuring the UE for receiving a repetition of
`PDSCH information from multiple TRPs. Other types of
`transmission parameters may include redundancy version,
`modulation order and demodulation reference signal
`(DMRS) initialization. Several different processes are dis(cid:173)
`closed for informing the UE of the transmission parameters.
`In the particular case of QCL information, the QCL rela(cid:173)
`tionships can be associated with transmission configuration
`indication (TCI) states, each TCI state associated with a
`respective TRP (or beam) or respective RS and DMRS
`antenna port ( or port group), or both, and the TCI states are
`provided to the UE. In another case, a TCI state is configured
`with parameters that define the QCL information. With
`different QCL information in different TCI states, each TCI
`state can be associated with a different TRP or beam. In
`some embodiments, different QCL information can be
`defined in one TCI state, and each QCL information can be
`
`Ex.1015
`APPLE INC. / Page 15 of 30
`
`

`

`US 2020/0015200 Al
`
`Jan. 9, 2020
`
`4
`
`associated with a different TRP or beam. In some embodi(cid:173)
`ments, the TCI states can be provided to the UE using
`dynamic signaling by downlink control information (DCI).
`In some embodiments, the TCI states can be provided to the
`UE using a combination of semi-static signaling and
`dynamic signaling, for example using DCI. Two particular
`examples of semi-static signaling are radio resource control
`(RRC) signaling and a combination of RRC signaling
`together with a media access control (MAC) control element
`(CE). The combination of semi-static signaling and dynamic
`signaling may include providing the UE predefined configu(cid:173)
`rations of TCI states or DMRS ports/port groups, or both,
`using higher layer signaling. The higher layer signaling may
`include RRC or RRC and MAC CE and then a particular
`configuration can be selected from the predefined configu(cid:173)
`rations by dynamic signaling using the DCI. In some
`embodiments predefined associations between TCI states, or
`port or port groups, and transmission parameters, such as
`QCL information, are known to the UE or are provided to
`the UE by RRC higher layer signaling.
`[0057] The following paragraphs provide context in the
`form of the description of an overall system that includes
`both base stations and electronic devices served by the base
`stations.
`[0058] FIG. 1 illustrates an example communication sys(cid:173)
`tem 100 in which embodiments of the present disclosure
`could be implemented. In general, the communication sys(cid:173)
`tem 100 enables multiple wireless or wired elements to
`communicate data and other content. The purpose of the
`communication system 100 may be to provide content
`(voice, data, video, text) via broadcast, narrowcast, user
`device to user device, etc. The communication system 100
`may operate by sharing resources such as bandwidth.
`[0059]
`In this example, the communication system 100
`includes electronic devices (ED) ll0a-ll0c, radio access
`networks (RANs) 120a and 120b, a core network 130, a
`public switched telephone network (PSTN) 140, the internet
`150, and other networks 160. Although certain numbers of
`these components or elements are shown in FIG. 1, any
`reasonable number of these components or elements may be
`included in the communication system 100.
`[0060] The EDs 110a, 110b and 110c are configured to
`operate in the communication system 100. For example, the
`EDs ll0a-ll0c are configured to transmit, receive, or both,
`via wireless or wired communication channels. Each ED
`ll0a-ll0c represents any suitable end user device for wire(cid:173)
`less operation and may include such devices ( or may be
`referred to) as a user equipment/device (UE), wireless
`transmit/receive unit (WTRU), mobile station, fixed or
`mobile subscriber unit, cellular telephone, station (STA),
`machine type communication (MTC) device, personal digi(cid:173)
`tal assistant (PDA), smartphone, laptop, computer, tablet,
`wireless sensor, or consumer electronics device.
`[0061]
`In FIG. 1, the RANs 120a and 120b include base
`stations 170a and 170b, respectively. Each base station 170a
`and 170b is configured to wirelessly interface with one or
`more of the EDs 110a, 110b and 110c, the core network 130,
`the PSTN 140, the internet 150, and/or the other networks
`160. For example, the base stations 170a-l 70b may include
`( or be) one or more of several well-known devices, such as
`a base transceiver station (BTS), a Node-B (NodeB), an
`evolved NodeB (eNodeB), a Home eNodeB, a gNodeB, a
`transmission point (TP), a site controller, an access point
`(AP), or a wireless router. Any ED 110a, 110b and 110c may
`
`be alternatively or additionally configured to interface,
`access, or communicate with any other base station 170a and
`170b, the internet 150, the core network 130, the PSTN 140,
`the other networks 160, or any combination of the preced(cid:173)
`ing. The communication system 100 may include RANs,
`such as RAN 120b, wherein the corresponding base station
`170b accesses the core network 130 or the internet 150, as
`shown.
`[0062] The EDs 110a, 110b and 110c and base stations
`170a and 170b are examples of communication equipment
`that can be configured to implement some or all of the
`functionality and/or embodiments described herein. In the
`embodiment shown in FIG. 1, the base station 170a forms
`part of the RAN 120a, which may include other base
`stations, base station controller(s) (BSC), radio network
`controller(s) (RNC), and/or relay nodes. The functions of
`any base station 170a and 170b may be localized to a single
`location, as shown, or be distributed within the network,
`such as distributed in the corresponding RAN. Also, the base
`station 170b forms part of the RAN 120b, which may
`include other ba