WO2020221452A1 - Indication de port d'antenne pour transmissions multitrp - Google Patents

Indication de port d'antenne pour transmissions multitrp Download PDF

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Publication number
WO2020221452A1
WO2020221452A1 PCT/EP2019/061203 EP2019061203W WO2020221452A1 WO 2020221452 A1 WO2020221452 A1 WO 2020221452A1 EP 2019061203 W EP2019061203 W EP 2019061203W WO 2020221452 A1 WO2020221452 A1 WO 2020221452A1
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WO
WIPO (PCT)
Prior art keywords
antenna ports
subset
belong
client device
network access
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PCT/EP2019/061203
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English (en)
Inventor
Wenquan HU
Bengt Lindoff
Xiaoyan Bi
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2019/061203 priority Critical patent/WO2020221452A1/fr
Publication of WO2020221452A1 publication Critical patent/WO2020221452A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • 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
    • 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
    • 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
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the invention relates to a network access node and a client device for antenna port indication for multi TRP/panel transmissions. Furthermore, the invention also relates to corresponding methods and a computer program.
  • DMRS configuration type 1 uses an interleaved frequency division multiple access (IFDMA) based approach with an aim to be used for scenarios of up to 8 orthogonal antenna ports
  • DMRS configuration type 2 uses 2-FD-OCC (frequency-domain orthogonal cover code) with an aim for scenarios of up to 12 orthogonal antenna ports.
  • IFDMA interleaved frequency division multiple access
  • 2-FD-OCC frequency-domain orthogonal cover code
  • DMRS port indexing for two-symbol DMRS with cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) DMRS port indexing in code division multiplexing/multiplex (CDM) group is ⁇ 0,1 , 4, 5 ⁇ , ⁇ 2, 3, 6, 7 ⁇ .
  • CDM code division multiplexing/multiplex
  • DMRS port indexing for two-symbol DMRS with CP-OFDM DMRS port indexing in CDM group is ⁇ 0,1 , 6, 7 ⁇ , ⁇ 2, 3, 8, 9 ⁇ , ⁇ 4,5,10,11 ⁇ .
  • DCI Format 1 _ 1 advanced multiple input multiple output (MIMO) schemes are supported by antenna port indication for both single user MIMO (SU-MIMO) and multi user MIMO (MU-MIMO).
  • the antenna port indicator occupies 4, 5, or 6 bits as defined by Tables 7.3.1 .2.2-1 /2/3/4, where the number of CDM groups without data of values 1 , 2, and 3 refers to CDM groups ⁇ 0 ⁇ , ⁇ 0,1 ⁇ , and ⁇ 0, 1 ,2 ⁇ , respectively.
  • NR Rel. 15 the following MIMO features are included: limited support for multi transmission and reception (TRP) or multi panel operation, flexible channel state indication (CSI) acquisition and beam management, Type I (low-resolution) and II (high-resolution) codebooks supporting up to 32 ports, and flexible reference signal (RS) for MIMO transmission, especially CSI-RS, DMRS, and sounding reference signal (SRS).
  • TRP transmission and reception
  • CSI channel state indication
  • RS sounding reference signal
  • One aspect that can be enhanced is to support multi-TRP/panel transmission including improved reliability and robustness with both ideal and non-ideal backhaul.
  • a design target is to specify in the downlink for an efficient support of a non-coherent joint transmission in multi TRP/panel/beam scenario.
  • a typical multi TRP scenario with ideal backhaul is with a single physical downlink control channel (PDCCH) from one TRP and two physical downlink shared channels (PDSCHs) (or two layers of a codeword) from two TRPs with ideal back
  • An objective of embodiments of the invention is to provide a solution which mitigates or solves the drawbacks and problems of conventional solutions.
  • a network access node for a wireless communication system the network access node being configured to
  • a first subset of antenna ports are associated to a first transmission configuration indicator, TCI, state and belong to at least one code division multiplexing, CDM, group, and a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group;
  • the downlink control information comprises an indicator indicating the set of antenna ports for downlink reference signals in the ordered subsets of antenna ports.
  • the invention hence discloses an antenna port indication method where the first and second TCI states can be easily mapped to the antenna ports with the use of ordered first and second subsets of antenna ports.
  • Antenna ports herein can be understood as DMRS ports in 3GPP NR systems. Hence, the invention can be applicable for both DMRS configuration type 1 and type 2.
  • the indicator of the DCI can be represented as an indicator value, e.g. as a bitstream. Based on such a bitstream the first and second subsets can be derived, e.g. from an antenna port indictor table for reference signals. Such a table can be given by a standard.
  • An advantage of the network access node according to the first aspect is that it provides more scheduling flexibility of antenna port scheduling associated with multiple TCI states compared to conventional solutions. Thereby, e.g. better robustness and higher data rate transmissions can be achieved in the wireless communication system.
  • the first subset of antenna ports and the second subset of antenna ports are disjoint.
  • first and second subsets of antenna ports are disjoint can mean that they don’t comprise any common antenna ports, hence comprises different antenna ports. This means that the antenna ports of the first subset are exclusive to the first subset and the antenna ports of the second subset are exclusive to the second subset.
  • An advantage with this implementation form is that simplified signaling can be archived with this implementation form. This is due to the fact that each antenna port is clearly mapped to a single TCI state.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ordered sequence.
  • Order sequence can mean that the antenna ports in each subset are arranged in a specific order according to the antenna port indexing.
  • the antenna ports may be arranged in descending or ascending indexing order.
  • An advantage with this implementation form is that the antenna ports can easily be associated to the different TCI states and thereby signaling overhead can be reduced.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ascending order.
  • An advantage with this implementation form is that the antenna ports can easily be associated to the different TCI states and thereby signaling overhead can be reduced.
  • the indication of the first subset of antenna ports and the second subset of antenna ports are distinguished from each other with a punctuation mark.
  • the punctuation mark is in more general terms a distinguishing mark, i.e. a mark that distinguishes and separates the first and second subsets. Examples of punctuation marks are comma, semicolon, apostrophe, bracket, dash, hyphen, colon, etc.
  • An advantage with this implementation form is that a simple way of distinguishing the different subsets is provided.
  • the first subset of antenna ports belong to a first CDM group and the second subset of antenna ports belong to a second CDM group.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 1 is supported.
  • the first subset of antenna ports belong to one CDM group and the second subset of antenna ports belong to two other CDM groups.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 2 is supported.
  • the first subset of antenna ports belong to two CDM groups, and the second subset of antenna ports belong to one other CDM group.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 2 is supported.
  • the downlink control information is associated with multi transmission and reception point transmissions.
  • this implementation form can support multi transmission and reception point transmissions.
  • the above mentioned and other objectives are achieved with a client device for a wireless communication system, the client device being configured to
  • the downlink control information comprises an indicator indicating a set of antenna ports for downlink reference signals in ordered disjoint subsets of antenna ports, wherein
  • a first subset of antenna ports are associated to a first TCI state and belong to at least one CDM group
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group;
  • An advantage of the client device according to the second aspect is that it provides more scheduling flexibility of antenna port scheduling associated with multiple TCI states compared to conventional solutions. Thereby, e.g. higher data rate transmissions can be achieved in the wireless communication system.
  • the first subset of antenna ports and the second subset of antenna ports are disjoint.
  • An advantage with this implementation form is that simplified signaling can be archived with this implementation form.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ordered sequence.
  • An advantage with this implementation form is that the antenna ports can easily be associated to the different TCI states and thereby signaling overhead can be reduced.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ascending order.
  • An advantage with this implementation form is that the antenna ports can easily be associated to the different TCI states and thereby signaling overhead can be reduced.
  • the first subset of antenna ports and the second subset of antenna ports are distinguished from each other with a punctuation mark.
  • An advantage with this implementation form is that a simple way of distinguishing the different subsets is provided.
  • the first subset of antenna ports belong to a first CDM group and the second subset of antenna ports belong to a second CDM group.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 1 is supported.
  • the first subset of antenna ports belong to one CDM group and the second subset of antenna ports belong to two other CDM groups.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 2 is supported.
  • the first subset of antenna ports belong to two CDM groups, and the second subset of antenna ports belong to one other CDM group.
  • An advantage with this implementation form is that a flexible antenna port indication solution is provided meaning higher data rates in the wireless communication system. Further, DMRS configuration type 2 is supported.
  • the client device is configured to
  • the client device is configured to
  • An advantage with this implementation form is that it is compatible with current downlink control and data channel design.
  • decode the downlink data transmission comprises
  • An advantage with this implementation form is that it is compatible with current downlink control and data channel design. Further, due to the flexible antenna port indication solution higher data rates in the wireless communication system is possible.
  • the downlink control information is associated with multi transmission and reception point transmissions.
  • An advantage with this implementation form is that this implementation form can support multi transmission and reception point transmissions.
  • the above mentioned and other objectives are achieved with a method for a network access node, the method comprises
  • a first subset of antenna ports are associated to a first transmission configuration indicator, TCI, state and belong to at least one CDM group, and a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group;
  • the downlink control information comprises an indicator indicating the set of antenna ports for downlink reference signals in the ordered subsets of antenna ports.
  • an implementation form of the method comprises the feature(s) of the corresponding implementation form of the network access node.
  • the above mentioned and other objectives are achieved with a method for a client device, the method comprises
  • the downlink control information comprises an indicator indicating a set of antenna ports for downlink reference signals in ordered disjoint subsets of antenna ports, wherein
  • a first subset of antenna ports are associated to a first TCI state and belong to at least one CDM group
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group;
  • an implementation form of the method comprises the feature(s) of the corresponding implementation form of the client device.
  • the invention also relates to a computer program, characterized in program code, which when run by at least one processor causes said at least one processor to execute any method according to embodiments of the invention. Further, the invention also relates to a computer program product comprising a computer readable medium and said mentioned computer program, wherein said computer program is included in the computer readable medium, and comprises of one or more from the group: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically EPROM) and hard disk drive.
  • ROM Read-Only Memory
  • PROM Programmable ROM
  • EPROM Erasable PROM
  • Flash memory Flash memory
  • EEPROM Electrically EPROM
  • - Fig. 1 shows a network access node according to an example of the invention
  • FIG. 2 shows a method for a network access node according to an example of the invention
  • FIG. 3 shows a client device according to an example of the invention
  • - Fig. 4 shows a method for a client device according to an example of the invention
  • FIG. 5 shows a wireless communication system according to an example of the invention.
  • FIG. 6 shows a method for a client device according to an example of the invention.
  • each transmission configuration indicator (TCI) code point in a DCI can correspond to 1 or 2 TCI states.
  • TCI states When 2 TCI states are indicated, there should be a mapping between the TCI states and the DMRS CDM groups given that DMRS ports in one CDM group are quasi-collocation (QCL), especially for the DMRS type 2 case which has up to 3 CDM groups.
  • a user equipment (UE) is radio resource configuration (RRC) configured with a list of up to M candidate TCI states at least for the purposes of QCL indication.
  • RRC radio resource configuration
  • the UE receives an N-bit TCI field in DCI
  • the UE assumes that the PDSCH DMRS is QCLed with the DL RS(s) in the RS Set corresponding to the signaled TCI state
  • one TCI code point corresponds to only one TCI state.
  • the network indicates the TCI state to UE, and the UE may assume that the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS(s) in the TCI state with respect to the QCL type parameter(s) given by the indicated TCI state.
  • qcl-Type1 is for the first DL RS
  • qcl-Type2 is for the second DL RS if qcl-Type2 is configured.
  • embodiments of the invention relate to methods and devices for antenna port indication in wireless communication systems.
  • Fig. 1 shows a network access node 100 according to an embodiment of the invention.
  • the network access node 100 comprises a processor 102, a transceiver 104 and a memory 106.
  • the processor 102 is coupled to the transceiver 104 and the memory 106 by communication means 108 known in the art.
  • the network access node 100 may be configured for both wireless and wired communications in wireless and wired communication systems, respectively.
  • the wireless communication capability is provided with an antenna or antenna array 1 10 coupled to the transceiver 104, while the wired communication capability is provided with a wired communication interface 1 12 coupled to the transceiver 104. That the network access node 100 is configured to perform certain actions can in this disclosure be understood to mean that the network access node 100 comprises suitable means, such as e.g. the processor 102 and the transceiver 104, configured to perform said actions.
  • the network access node 100 is configured to determine a set of antenna ports for downlink reference signals in disjoint ordered subsets of antenna ports.
  • a first subset of antenna ports are associated to a TCI state and belong to at least one CDM group.
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group.
  • the network access node 100 is further configured to transmit a DCI to a client device 300.
  • the DCI comprises an indicator indicating the set of antenna ports for downlink reference signals in the ordered subsets of antenna ports.
  • Fig. 2 shows a flow chart of a corresponding method 200 which may be executed in a network access node 100, such as the one shown in Fig. 1 .
  • the method 200 comprises determining 202 a set of antenna ports for downlink reference signals in disjoint ordered subsets of antenna ports.
  • a first subset of antenna ports are associated to a first TCI state and belong to at least one CDM group.
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group.
  • the method 200 further comprises transmitting 204 a DCI to a client device 300.
  • the DCI comprises an indicator indicating the set of antenna ports for downlink reference signals in the ordered subsets of antenna ports.
  • Fig. 3 shows a client device 300 according to an embodiment of the invention.
  • the client device 300 comprises a processor 302, a transceiver 304 and a memory 306.
  • the processor 302 is coupled to the transceiver 304 and the memory 306 by communication means 308 known in the art.
  • the client device 300 further comprises an antenna or antenna array 310 coupled to the transceiver 304, which means that the client device 300 is configured for wireless communications in a wireless communication system. That the client device 300 is configured to perform certain actions can in this disclosure be understood to mean that the client device 300 comprises suitable means, such as e.g. the processor 302 and the transceiver 304, configured to perform said actions.
  • the client device 300 is configured to receive a DCI from a network access node 100.
  • the DCI comprises an indicator indicating a set of antenna ports for downlink reference signals in ordered disjoint subsets of antenna ports.
  • a first subset of antenna ports are associated to a first TCI state and belong to at least one CDM group.
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group.
  • the client device 300 is further configured to determine the set of antenna ports for the downlink reference signals based on the indicator in the DCI.
  • Fig. 4 shows a flow chart of a corresponding method 400 which may be executed in a client device 300, such as the one shown in Fig. 3.
  • the method 400 comprises receiving 402 a DCI from a network access node 100.
  • the DCI comprises an indicator indicating a set of antenna ports for downlink reference signals in ordered disjoint subsets of antenna ports.
  • a first subset of antenna ports are associated to a first TCI state and belong to at least one CDM group.
  • a second subset of antenna ports are associated to a second TCI state and belong to at least one other CDM group.
  • the method 400 further comprises determining 404 the set of antenna ports for the downlink reference signals based on the indicator in the DCI.
  • the first subset of antenna ports and the second subset of antenna ports are disjoint. That the first and second subsets of antenna ports are disjoint can mean that the first and second subsets don’t have any common antenna ports, hence comprises different antenna ports. This is e.g. the case when wherein the first subset of antenna ports belong to a first CDM group and the second subset of antenna ports belong to a second CDM group where the first and second CDM groups are different CDM groups.
  • the first subset of antenna ports can comprise antenna ports from any of CDM group 0, 1 , and 2 and the second subset of antenna ports can comprise antenna ports from any of CDM group 0, 1 , and 2 for the DMRS configuration type 2 where there are 3 CDM groups but the first subset of antenna ports and the second subset of antenna ports does not comprise antenna ports from the same CDM group since they are disjoint.
  • CDM group 2 does not exist.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ordered sequence.
  • order sequence can mean that the antenna ports in each subset are arranged in a specific order according to the antenna port indexing.
  • the antenna ports may be arranged in descending or ascending indexing order.
  • the first subset of antenna ports and the second subset of antenna ports are indicated in an ascending order.
  • Fig. 5 shows a wireless communication system 500 according to an embodiment of the invention.
  • the wireless communication system 500 comprises a network access node 100 and a client device 300 configured to operate in the wireless communication system 500.
  • the wireless communication system 500 shown in Fig. 5 only comprises one network access node 100 and one client device 300.
  • the wireless communication system 500 may comprise any number of network access nodes 100 and any number of client devices 300 without deviating from the scope of the invention.
  • the network access node transmits a DCI to the client device 300 in a PDCCH 510.
  • the DCI comprises an indicator indicating the set of antenna ports for downlink reference signals in the ordered subsets of antenna ports.
  • the client device 300 receives the DCI from the network access node 100, and thereafter determines the set of antenna ports for the downlink reference signals based on the indicator in the DCI. After having determined the set of antenna ports for the downlink reference signals the client device 300 receives downlink data transmission in a PDSCH 520 from the network access node 100 using the determined set of antenna ports.
  • the downlink data transmission is multi TRP transmissions and hence the DCI is therefore in this case associated with the multi TRP transmissions.
  • FIG. 6 A general procedure of utilizing TCI information and DMRS ports information in the DCI for a PDSCH reception according to embodiments of the invention is illustrated in the flow chart 600 of Fig. 6.
  • the embodiment illustrated in Fig. 6 is set in a 3GPP NR context and hence the expressions, terminology and system design herein used. Embodiments of the invention are however not limited thereto.
  • a client device 300 receives a DCI in a PDCCH and determines a set of antenna ports associated with a downlink data transmission in a corresponding PDSCH.
  • the client device 300 upon detection of the PDCCH with a configured DCI format 1_0 or 1_1 decodes the corresponding PDSCH as indicated by the DCI.
  • the DCI scheduling information of the PDSCH is indicated, which may include TCI information and DMRS port information for the PDSCH.
  • the TCI information indicates the QCL relationship between the DMRS and DL RS(s), such as SSB or CSI-RS, and thereby for example which beam the respective DMRS and DL RS belong to.
  • the DCI information gives information about which DMRS ports that are allocated to a first TCI state or a corresponding first beam and which DMRS ports that are allocated to a second TCI state or a corresponding second beam.
  • the client device 300 performs channel estimation on respective antenna ports for the PDSCH according to the indicated QCL information and the DMRS port(s), and hence estimate the channel for respective beam from different TRPs.
  • the client device 300 estimates a first set of channels associated with the first TCI state based on downlink reference signals from the first subset of antenna ports; and estimates a second set of channels associated with the second TCI state based on downlink reference signals from the second subset of antenna ports.
  • the first and second set of channels are in embodiments set of radio channels.
  • the client device 300 performs demodulation and decoding of the PDSCH channel transmitted in respective beam using the estimated channels in step 604.
  • the client device 300 finally decodes the downlink data transmission based on the first set of estimated channels and the second set of estimated channels obtained in step 604.
  • Table 1 below illustrates an embodiment of the invention designed for DMRS configuration type 1 with max length of DMRS symbol that equals to 1 and two TCI states, i.e. a first TCI state and a second TCI state, are indicated.
  • the first subset of antenna ports belong to a first CDM group and the second subset of antenna ports belong to a second CDM group.
  • CDM group 1 the following non-limiting cases can be supported: [CDM group 0; CDM group 1 ], [CDM group 1 ; CDM group 0], [CDM group 0; CDM group 2], and [CDM group 2; CDM group 0].
  • the punctuation mark is in this case semicolon and differentiates the antenna ports allocated for TCI state 1 and TCI state 2, respectively.
  • Table 1 there are 6 example entries (rows) for DMRS ports shown and one reserved entry (the last row).
  • a reserved entry is an entry that is not currently allocated.
  • the DMRS ports are ordered in two different subsets, separated by a punctuation mark, in this case a semicolon. Take the first entry as an example, the first subset is composed of DMRS ports 0 and 1 which belong to CDM group 0, while the second subset is composed of DMRS port 2 which belongs to CDM group 1.
  • the other entries in Table 1 follow similar structure.
  • first entry and the second entry in Table 1 are different from each other in the sense that the order of the subsets are different which means their mapping to the TCI states are different.
  • antenna port 0 and 1 are associated with the first TCI state of the two TCI states indicated by the TCI code point in a DCI
  • antenna port 2 is associated with the second TCI state of the two TCI states indicated by the TCI code point in the DCI, and vice versa.
  • the indicator in the DCI can be given as an indicator value.
  • the indicator value is given in an integer representation.
  • the indicator value can also be given in any other suitable format such as in hexadecimal representation of positive integers 1 , 2, 3,... or letters A, B, C,.., or bit streams, etc.
  • Table 1 Table 2 illustrates another embodiment of the invention designed for DMRS configuration type 1 with max length of DMRS symbol that equals to 1 and for one or two TCI states.
  • the indicator value is also given in positive integer numbers. It is also noted that some of the entries only relate to the case of one CDM group (e.g. entry 0 and 1 ) whilst other entries relate to the case of two CDM groups and they are permuted in ordered subsets marked by a semicolon, e.g. entry 12, 13 and 14.
  • Table 3 illustrates yet another embodiment of the invention which in this case is designed for DMRS configuration type 2 with max length of DMRS symbol that equals to 1 and the two TCI states are indicated.
  • the first subset of antenna ports belong to one CDM group and the second subset of antenna ports belong to one other CDM groups; while for some other entries, the first subset of antenna ports belong to one CDM group and the second subset of antenna ports belong to two other CDM groups; or the first subset of antenna ports belong to two CDM groups, and the second subset of antenna ports belong to one other CDM group.
  • Example entries for DMRS port indication are presented for both single code word enabled cases and dual code word enabled cases in Table 3.
  • a codeword in this context refers a stream of cyclic redundancy check (CRC) coded bits from one transport block (TB).
  • CRC cyclic redundancy check
  • the DMRS ports are ordered in first and second subsets, separated by a punctuation mark, in this case a semicolon. Take the first entry (row) for single code word enabled cases (left part) as an example, the first segment is composed of DMRS ports 0 and 1 which belong to CDM group 0, while the second segment is composed of DMRS port 2 which belongs to CDM group 1 .
  • the other entries follow similar structure.
  • first entry and the second entry are different from each other in the sense that the order of the subsets are different.
  • antenna port O and 1 are associated with the first TCI state of the two TCI states indicated by the TCI code point in a DCI
  • antenna port 2 is associated with the second TCI state of the two TCI states indicated by the TCI code point in the DCI, and vice versa.
  • the first and second subsets of antenna ports are permuted.
  • the first subset is composed of DMRS ports 0 and 1 which belong to CDM group 0, while the second subset is composed of DMRS port 2, 3 and 4, which belong to CDM group 1 and CDM group 2.
  • the other entries follow similar structure. It is also herein noted that the first entry and the second entry, in the right part of Table 3, are different from each other in the sense that division of the DMRS ports are different.
  • subset port 0 and 1 are associated with the first TCI state of the two TCI states indicated by the TCI code point in a DCI
  • subset port 2, 3 and 4 belonging to CDM group 1 and group 2 are associated with the second TCI state of the two TCI states indicated by the TCI code point in the DCI, and vice versa.
  • a new form of DMRS antenna port indication table can be introduced, where each entry is arranged according to the disjoint ordering of antenna ports according to embodiments of the invention.
  • Each subset of DMRS ports of two first and second subsets corresponds to mapping to the corresponding TCI state of two TCI states indicated by the TCI code point in a DCI.
  • the first TCI state can be mapped to one or two CDM groups.
  • a DMRS port indication table according to embodiments of the invention could be introduced in section 7.3.1.2.2 in standard TS 38.212.
  • the new DMRS port indication tables can be applied by an indicator or an implicit derivation method which indicates that two TCI states are enabled for single PDCCH based multi TRP transmission. Or in another words, the following example entries can be added to existing antenna port indication tables in section 7.3.1.2.2 in TS 38.212. It is noted that the DMRS ports in each entry are ordered into first and second subsets by a semicolon. The first subset is associated to the first indicated TCI state, while the second subset is associated to the second indicated TCI state. Table 4 is used for DMRS configuration type 1 and Table 5 is used for DMRS configuration type 2.
  • the client device 300 herein, may be denoted as a user device, a User Equipment (UE), a mobile station, an internet of things (loT) device, a sensor device, a wireless terminal and/or a mobile terminal, is enabled to communicate wirelessly in a wireless communication system, sometimes also referred to as a cellular radio system.
  • the UEs may further be referred to as mobile telephones, cellular telephones, computer tablets or laptops with wireless capability.
  • the UEs in this context may be, for example, portable, pocket-storable, hand-held, computer- comprised, or vehicle-mounted mobile devices, enabled to communicate voice and/or data, via the radio access network, with another entity, such as another receiver or a server.
  • the UE can be a Station (STA), which is any device that contains an IEEE 802.1 1 -conformant Media Access Control (MAC) and Physical Layer (PHY) interface to the Wireless Medium (WM).
  • STA Station
  • MAC Media Access Control
  • PHY Physical Layer
  • the UE may also be configured for communication in 3GPP related LTE and LTE-Advanced, in WiMAX and its evolution, and in fifth generation wireless technologies, such as New Radio.
  • the network access node 100 herein may also be denoted as a radio network access node, an access network access node, an access point, or a base station, e.g. a Radio Base Station (RBS), which in some networks may be referred to as transmitter,“gNB”,“gNodeB”,“eNB”, “eNodeB”,“NodeB” or“B node”, depending on the technology and terminology used.
  • RBS Radio Base Station
  • the radio network access node may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size.
  • the radio network access node can be a Station (STA), which is any device that contains an IEEE 802.1 1 -conformant Media Access Control (MAC) and Physical Layer (PHY) interface to the Wireless Medium (WM).
  • STA Station
  • MAC Media Access Control
  • PHY Physical Layer
  • the radio network access node may also be a base station corresponding to the fifth generation (5G) wireless systems.
  • any method according to embodiments of the invention may be implemented in a computer program, having code means, which when run by processing means causes the processing means to execute the steps of the method.
  • the computer program is included in a computer readable medium of a computer program product.
  • the computer readable medium may comprise essentially any memory, such as a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable PROM), a Flash memory, an EEPROM (Electrically Erasable PROM), or a hard disk drive.
  • embodiments of the network access node 100 and the client device 300 comprises the necessary communication capabilities in the form of e.g., functions, means, units, elements, etc., for performing the solution.
  • means, units, elements and functions are: processors, memory, buffers, control logic, encoders, decoders, rate matchers, de-rate matchers, mapping units, multipliers, decision units, selecting units, switches, interleavers, de-interleavers, modulators, demodulators, inputs, outputs, antennas, amplifiers, receiver units, transmitter units, DSPs, MSDs, TCM encoder, TCM decoder, power supply units, power feeders, communication interfaces, communication protocols, etc. which are suitably arranged togetherfor performing the solution.
  • the processor(s) of the network access node 100 and the client device 300 may comprise, e.g., one or more instances of a Central Processing Unit (CPU), a processing unit, a processing circuit, a processor, an Application Specific Integrated Circuit (ASIC), a microprocessor, or other processing logic that may interpret and execute instructions.
  • the expression“processor” may thus represent a processing circuitry comprising a plurality of processing circuits, such as, e.g., any, some or all of the ones mentioned above.
  • the processing circuitry may further perform data processing functions for inputting, outputting, and processing of data comprising data buffering and device control functions, such as call processing control, user interface control, or the like.

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

Abstract

L'invention concerne un nœud d'accès au réseau et un dispositif client pour l'indication de port d'antenne pour les transmissions multi TRP/panneaux. Le nœud d'accès au réseau détermine un ensemble de ports d'antenne pour des signaux de référence de liaison descendante dans des sous-ensembles ordonnés disjoints de ports d'antenne, et transmet des informations de commande de liaison descendante à un dispositif client (300), les informations de commande de liaison descendante comprenant un indicateur indiquant l'ensemble de ports d'antenne pour des signaux de référence de liaison descendante dans les sous-ensembles ordonnés de ports d'antenne. Le dispositif client (300) reçoit les informations de commande de liaison descendante en provenance d'un nœud d'accès au réseau (100) et détermine l'ensemble de ports d'antenne pour les signaux de référence de liaison descendante sur la base de l'indicateur dans les informations de commande de liaison descendante. Les informations de commande de la liaison descendante comprennent un indicateur indiquant un ensemble de ports d'antenne pour les signaux de référence de la liaison descendante dans des sous-ensembles disjoints ordonnés de ports d'antenne, dans lequel un premier sous-ensemble de ports d'antenne est associé à un premier état TCI et appartient à au moins un groupe CDM, et un second sous-ensemble de ports d'antenne est associé à un second état TCI et appartient à au moins un autre groupe CDM; et la détermination de l'ensemble de ports d'antenne pour les signaux de référence de la liaison descendante sur la base de l'indicateur dans les informations de commande de la liaison descendante. Ainsi, une flexibilité de planification de la planification de port d'antenne associée à de multiples états TCI peut être réalisée. Il en résulte des débits de données plus élevés dans un système de communication sans fil. En outre, la présente invention concerne également des procédés correspondants et un programme informatique.
PCT/EP2019/061203 2019-05-02 2019-05-02 Indication de port d'antenne pour transmissions multitrp WO2020221452A1 (fr)

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Citations (1)

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