WO2017008236A1 - Procédé et appareil de configuration et de détection de signal de référence - Google Patents

Procédé et appareil de configuration et de détection de signal de référence Download PDF

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Publication number
WO2017008236A1
WO2017008236A1 PCT/CN2015/083946 CN2015083946W WO2017008236A1 WO 2017008236 A1 WO2017008236 A1 WO 2017008236A1 CN 2015083946 W CN2015083946 W CN 2015083946W WO 2017008236 A1 WO2017008236 A1 WO 2017008236A1
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Prior art keywords
antenna ports
reference signal
indicator
predefined
resource
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PCT/CN2015/083946
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English (en)
Inventor
Chuangxin JIANG
Yukai GAO
Gang Wang
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Nec Corporation
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Priority to PCT/CN2015/083946 priority Critical patent/WO2017008236A1/fr
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    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]

Definitions

  • the non-limiting and exemplary embodiments of the present disclosure generally relate to the technical field of radio communications, and specifically to a method and apparatus for reference signal configuration and detection.
  • MIMO Multiple Input and Multiple Output
  • SE spectrum efficiency
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • 3GPP third generation project partnership
  • Conventional one-dimensional (horizontal domain) antenna array can provide flexible beam adaption in the azimuth domain only through the horizontal domain precoding process, wherein a fixed down-tilt is applied in the vertical direction. It has been found recently that full MIMO capability can be exploited through leveraging a two dimensional (2D) antenna planar such that a user-specific elevation beamforming and spatial multiplexing in the vertical domain are also possible.
  • 2D two dimensional
  • FD-MIMO full dimensional MIMO
  • TxRUs transceiver Units
  • CSI channel state information
  • CSI-RS is used for CSI measurement, and at the current stage, some candidate schemes for CSI-RS enhancement in 3GPP Rel-13 have been included in a 3GPP document TR 36.897, which mainly focuses on discussions related to beamformed CSI-RS schemes and non-precoded CSI-RS. It has been proposed that to facilitate 3D channel information measurement at a user equipment (UE) side, a CSI-RS should be transmitted from 8 or more antenna ports. Up to 16 antenna ports for transmitting a non-precoded CSI-RS is desired. Regarding beamformed CSI-RS, it may reduce CSI-RS overhead and provide accurate and full dimensional CSI measurement for an antenna array with large number TxRUs.
  • a downlink MIMO transmission can be generally expresses as follows:
  • W W1*W2
  • W1 [X 0; 0 X] which is block diagonal.
  • the block diagonal W1 is used for matching the spatial covariance of dual-polarized antenna setup with any spacing (e.g. ⁇ /2 or 4 ⁇ ) .
  • DFT Discrete Fourier Transformation
  • eNB can configure one or more CSI-RS resources on a UE expected 3D beam.
  • UE may choose one or multiple beams, and report CSI on chosen beam (s) .
  • the CSI-RS is beamformed using a 3D precoding vector W CSI-RS before transmission, then at the receiver side, the obtained signal can be expressed as:
  • y CSI-RS HW CSI-RS s CSI-RS + V
  • s CSI-RS is the CSI_RS
  • v is the interference plus noise.
  • an eNB can configure one or more CSI-RS resources on UE expected vertical beams for CSI measurement. It has been discussed in 3GPP that multiple beams should be configured to UE as UE specific or cell specific RS. UE may choose one or multiple beams, and report CSI on chose beam (s) . If the UE is configured with one beam in one CSI process, the CSI computation and feedback can be same as the legacy ones. Then the scheme can be eNB implementation issues.
  • the scheme of non-beamformed (or, non-precoded) CSI-RS was discussed in 3GPP documents R1-152483 and R1-151646.
  • the non-precoded CSI-RS based scheme implies that one CSI-RS port can only mapped onto one transceiver unit (TxRU) without any virtualization.
  • full CSI-RS port measurement scheme is a natural extension from legacy CSI-RS ports measurement mechanism.
  • Full CSI-RS port measurement and feedback scheme stands for the scheme that all the CSI-RS ports cover all the TxRUs in the one to one mapping manner so that full channel spatial information can be obtained. Given that, this scheme can achieve the optimal measurement performance as full freedom of antenna ports can be utilized and the full channel information can be measured.
  • Non-precoded CSI-RS pattern design can consider a CSI-RS pattern design with CSI-RSs time divisionally multiplexed (TDMed) among different subframes, one PRB pair based CSI-RS pattern design, and a CSI-RS pattern design with CSI-RSs frequency divisionaly multiplexed (FDMed) among different PRB pairs.
  • TDMed time divisionally multiplexed
  • FDMed frequency divisionaly multiplexed
  • Fig. 1C by configuring multiple CSI-RS resources, it is possible to secure both scalability (e.g. to support up to 64 CSI-RS ports) and flexibility (e.g. to support multiple of 2 CSI-RS ports) .
  • a method for reference signal configuration in a multiple input multiple output system comprises transmitting a first indicator to a device for indicating a number of antenna ports for the reference signal; and transmitting a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal, wherein the corresponding number is related to the number indicated by the first indicator; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and/or, wherein the second indicator further indicates a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the first indicator may indicate the number of antenna ports for the reference signal by indicating an element in a predefined set, and wherein at least two elements in the predefined set may indicate a same number of antenna ports and different numbers of horizontal antenna ports.
  • the first indicator may indicate the number of antenna ports for the reference signal by indicating an element in a predefined set, and wherein at least one element in the predefined set may indicate that the reference signal is beamformed.
  • the at least one elements in the predefined set may further indicate implicitly a predefined number of beams and a predefined number of antenna ports for the reference signal.
  • the first indicator may indicate the number of antenna ports for the reference signal by jointly indicating the number of antenna ports for the reference signal together with the second indicator.
  • the first indicator may indicate part of information on a resource configuration for a predefined number of antenna ports for the reference signal by jointly indicating the resource configuration for the corresponding number of antenna ports for the reference signal together with the second indicator, and wherein when the first indicator indicate a first predefined number of antenna ports, the second indicator may indicate a resource configuration for a second predefined number of antenna ports which is different from the first predefined number of antenna ports.
  • at least two configuration candidates in the predefined configuration set may indicate partly overlapped resources for the N antenna ports.
  • the second indicator may indicate the resource configuration by indicating a resource configuration for the corresponding number of antenna ports from a predefined configuration set, and at least one configuration candidates in the predefined configuration set may indicate a predefined resource hopping pattern for the corresponding number of antenna ports.
  • the predefined resource hopping pattern may indicate resource change for at least part of the corresponding number of antenna ports in different physical resource blocks or different subframes.
  • the predefined resource hopping pattern may indicate the resource change for the at least part of the corresponding number of antenna ports in different physical resource blocks or different subframes on a per-beam basis.
  • the method may further comprise transmitting a third indicator to the device for indicating whether resource hopping for the reference signal is enabled.
  • a method for reference signal detection in a multiple input multiple output system comprises receiving, from a base station, a first indicator for indicating a number of antenna ports for the reference signal; and receiving from the base station a second indicator for indicating a resource configuration for a corresponding number of antenna ports for the reference signal; and detecting the reference signal based on the received first indicator and the received second indicator; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal, and/or, wherein the second indicator further indicates a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the method may further comprise receiving, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled, and wherein detecting the reference signal based on the received first indicator and the received second indicator comprises detecting the reference signal also based on the received third indicator.
  • an apparatus for reference signal configuration in a multiple input multiple output system comprises a first transmitting unit, configured to transmit a first indicator to a device for indicating a number of antenna ports for the reference signal; and a second transmitting unit, configured to transmit a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal, wherein the corresponding number is related to the number indicated by the first indicator; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and/or, wherein the second indicator further indicates a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • an apparatus for reference signal detection in a multiple input multiple output system comprises a first receiving unit, configured to receive, from a base station, a first indicator for indicating a number of antenna ports for the reference signal; and a second receiving unit, configured to receive from the base station a second indicator for indicating a resource configuration for a corresponding number of antenna ports for the reference signal; and a detection unit, configured to detect the reference signal based on the received first indicator and the received second indicator; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and/or, wherein the second indicator further indicates a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the apparatus may further comprise a third receiving unit, configured to receive, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled, and wherein the detection unit is further configured to detect the reference signal also based on the received third indicator.
  • a third receiving unit configured to receive, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled, and wherein the detection unit is further configured to detect the reference signal also based on the received third indicator.
  • an apparatus for reference signal configuration comprises a processor and a memory, said memory containing instructions executable by said processor whereby said apparatus is operative to perform any method in accordance with the first aspect of the disclosure.
  • an apparatus for downlink reference signal detection comprises a processor and a memory, said memory containing instructions executable by said processor whereby said apparatus is operative to perform any method in accordance with the second aspect of the disclosure.
  • a base station can configure CSI-RS flexibly and efficiently, and inform the configuration to UEs to enable proper detection.
  • Figs. 1A-1C illustrate schematically 3D beamforming, vertical beamforming and non-precoded CSI-RS, respectively;
  • Fig. 1D illustrates an exemplary wireless system where embodiments of the present invention may be implemented
  • Fig. 2A illustrates an exemplary flowchart of a method for a reference signal configuration according to an embodiment of the present disclosure
  • Fig. 2B illustrates an example for indicating number of antennas in vertical domain and horizontal domain respectively
  • Fig. 3A shows an example of obtaining 12-port CSI-RS configuration by combining a 8-port CSI-RS and a 4-port CSI-RS;
  • Fig. 3B shows an example of configuring a 16-port CSI-RS resource configuration for a 12-port CSI-RS
  • Figs. 3C-3D illustrate schematically power boosting for a CSI-RS antenna port in slot 0 and slot 1, respectively, with the CSI-RS resource configuration shown in Fig. 3B;
  • Fig. 4A illustrate schematically an undesired way for obtaining a 16-port CSI resource configuration by combining two 8-port CSI-RS configurations far from each other;
  • Fig. 4B illustrate schematically 10 resource configuration candidates for a 4-port CSI-RS
  • Fig. 4C illustrate schematically 10 overlapping resource configuration candidates for a 12-port CSI-RS and a 16-port CSI-RS by combining contiguous 4-port CSI-RS configurations
  • Figs. 5A-5B illustrate examples of resource hopping for vertically beamformed CSI-RS and 3D beamformed CSI-RS respectively;
  • Fig. 6A illustrates an exemplary procedure for implementing CSI-RS hopping
  • Fig. 6B illustrates an example of inter-group resource hopping for CSI-RS in different subframes
  • Fig. 6C illustrates an example of inter-set resource hopping for CSI-RS in different subframes
  • Fig. 6D illustrates an example of inter-group resource hopping for CSI-RS in different physical resource blocks (PRBs) ;
  • Fig. 7 illustrates an exemplary flowchart of a method for a reference signal detection according to an embodiment of the present disclosure
  • Figs. 8A-8E illustrate exemplary flowcharts of a method for a reference signal configuration according to an embodiment of the present disclosure
  • Fig. 9 illustrates a schematic block diagram of an apparatus in a wireless system for configuring reference signals according to an embodiment of the present disclosure
  • Fig. 10 illustrates a schematic block diagram of an apparatus for reference signal detection, according to an embodiment of the present disclosure.
  • Fig. 11 illustrates a simplified block diagram of apparatus that are suitable for use in practicing the embodiments of the present disclosure.
  • references in the specification to “one embodiment” , “an embodiment” , “an example embodiment” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is associated with the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and ” second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the term device used herein may refer to any terminal having wireless communication capabilities or user equipment (UE) , including but not limited to, mobile phone, cellular phones, smart phone, or personal digital assistants (PDAs) , portable computers, image capture device such as digital cameras, gaming devices, music storage and playback appliances, wearable devices and any portable units or terminals that have wireless communication capabilities, or Internet appliances permitting wireless Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • portable computers image capture device such as digital cameras, gaming devices, music storage and playback appliances, wearable devices and any portable units or terminals that have wireless communication capabilities, or Internet appliances permitting wireless Internet access and browsing and the like.
  • base station used herein may be referred to as e.g. eNB, eNodeB, NodeB, Base Transceiver Station BTS or Access Point (AP) , depending on the technology and terminology used.
  • AP Access Point
  • the wireless system 100 comprises one or more network nodes, e.g., 101, here in the form of an evolved Node B, also known as eNode Bs or eNBs. It will be appreciated that the network node 101 could also be in the form of Node Bs, BTSs (Base Transceiver Stations) , BS (Base Station) and/or BSSs (Base Station Subsystems) , etc.
  • the network node 101 may provide a macro cell or small cell and provide radio connectivity to a plurality of devices, e.g., UEs 102 -104.
  • the UE can be any wireless communication device which is portable or fixed. Moreover, the UEs 102-104 may, but not necessarily, be associated with a particular end user. Though for illustrative purpose, the wireless system 100 is described to be a 3GPP LTE network, the embodiments of the present disclosure are not limited to such network scenarios and the proposed methods and devices can also be applied to other wireless networks, e.g., a non-cellular network, where the principles described hereinafter are applicable.
  • the network node may transmit CSI-RS from multiple antenna ports to facilitate channel estimation and/or CSI measurement at the UE (e.g., UE 102) side.
  • the CSI-RS may be beamformed or non-precoded, as shown in Figs. 1A-1C.
  • LTE system e.g., LTE Release 10
  • up to 8 antenna ports for CSI-RS transmission are supported.
  • the existing CSI-RS transmission can be configured using parameters shown in Table 1, and details of the parameters can be found in section 6.3.2 of the 3GPP TS 36.331, V10.7.0 ′′Evolved Universal Terrestrial Radio Access (E-UTRA) ; Radio Resource Control (RRC) protocol specification. ′′
  • antennaPortsCount-r10 ENUMERATED ⁇ an1, an2, an4, an8 ⁇ , resourceConfiq-r10 INTEGER (0.. 31) , subframeConfiq-r10 INTEGER (0.. 154) ,
  • antenna array with 4 vertical antennas (or, 4 rows) and 2 horizontal antennas (or, 2 columns) can provide maximum 8 antenna ports
  • another antenna array with 1 vertical antenna and 8 horizontal antennas can provide same maximum number of antenna ports; however, the resulting CSI characteritstic from the two antenna array may be different and require different codebooks for precoding.
  • Current 3GPP specification fails to provide a scheme adaptive to different antenna arrangements.
  • existing CSI-RS configuration signaling shown in Table 1 assumes non-precoded CSI-RS, which may cause a large amount of resource consumption in case of increased number of antenna ports, and thus non-precoded CSI-RS may be used only for scenarios with small number of antenna ports. Beamformed CSI-RS schemes may be more suitable for scenarios with a large number of transceicer units (TxRUs) , since existing CSI-RS ports can be used by antenna virtualization of these TxRUs.
  • TxRUs transceicer units
  • a base station may need to inform UEs which scheme is used, especially when multiple beams are configured to UE in one CSI-RS process, since CSI computation processes may be different depending on the CSI-RS schemes.
  • legacy W2 can be reused to feedback beam selection information and inter-polarization co-phase information, i.e. UE only computes and feeds back CSI based on legacy codebook 2 of 8 transmitters after channel estimation of HW CSI-RS .
  • the single-user (SU) precoder for data transmission can be formed by:
  • W W CSI-RS .
  • the CSI computation and feedback procedure of vertically beamformed CSI-RS-based scheme may be same as that of non-precoded CSI-RS, this CSI-RS scheme may needn’ t to be distinguished with a non-precdoed CSI-RS scheme.
  • eNB only needs to use a reservation indication in a predefined set to indicate some other schemes, of which CSI computation or/and feedback is different with non-precoded CSI-RS based scheme.
  • Current 3GPP LTE system fails to provide a solution to enable adaptive CSI computation and feedback depending on different CSI-RS configuration schemes.
  • a CSI-RS with 16 antenna ports can be provided by combing two 8-port-CSI-RS resource configurations chosen from total 5 configurations for FDD case.
  • the number of candidate configurations available for LTE FDD is It will require 4 bits to indicate one configuration from the 10 candidates, and it means existing 5 bits for resourceConfig-rl0 as shown in Table 1 is more than enough for the configuration indication.
  • the number of candidate configurations available for LTE FDD is more than 32, and the number is even larger for LTE TDD. It means, a candidate configuration cannot be indicated by reusing existing 5 bits for resourceConfig-r10 as shown in Table 1.
  • using more bits for the configuration candidate indication means increased signaling overhead, and such overhead increase is unnecessary for 16-port CSI-RS configuration.
  • Fig. 2A illustrates an exemplary flowchart of a method 200 for a reference signal configuration according to an embodiment of the present disclosure.
  • the reference signal can be, but not limited to, a CSI-RS.
  • the method 200 may be applied for configuring any suitable signals and for solving similar problems.
  • the method 200 can be performed by a base station, e.g., the eNB 101 shown in Fig. 1D, but the present disclosure is not limited thereto. In an embodiment, at least part of the method 200 may be performed by another suitable device.
  • the base station transmit a first indicator to a device for indicating a number of antenna ports for the reference signal (RS) , wherein the device can be UE, e.g., the UE 102 shown in Fig.
  • RS reference signal
  • the reference signal can be a CSI-RS
  • the base station transmit a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal; wherein the corresponding number of antenna ports is related to the number indicated by the first indicator, which means the corresponding number can be indicated at least partly by the first indicator; wherein the first indicator may further indicate at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and/or, wherein the second indicator may further indicate a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the method 200 provides flexibility for the base station to adopt different RS configurations depending on need and inform UE accordingly to ensure proper RS detection at the UE side.
  • the first indicator may indicate a number of horizontal antenna ports (e.g., using 2 bits) and a number of vertical antenna ports (e.g., using another 2 bits) for the reference signal, separately, and the total number of antenna ports can be derived implicitly.
  • An example is shown in Fig. 2B, where 2 bits are used for indicate the horizontal domain and another 2 bits are used for indicating vertical domain of the antenna array arrangement.
  • the 4 bits are signaled as a field antennaPortsCount-r13 of a CSI-RS configuration signalling, embodiments of the disclosure are not limited thereto.
  • the first indicator may be an index.
  • the first indicator may be an index with a value 5, which points to the 6 th element of the predefined set (i.e., 16 antenna ports) , that is, the first indicator can indicate the number of antenna ports (16 in this example) for the CSI-RS by indicating an element in the predefined set.
  • at least two elements in the predefined set may indicate a same number of antenna ports and different numbers of horizontal antenna ports.
  • the predefined set may be ⁇ 1 port, 2 ports, 4 ports, 8 ports with 1 or 4 row (s) , 8 ports with 2 rows, 12 ports, 16 ports, reserved ⁇ , wherein the 4 th and the 5 th element indicate same number of antenna ports, but different antenna array arrangement, i.e., the 4 th element indicates an antenna array with 1 or 4 vertical antennas (8 or 2 horizontal antennas) , while the 5 th element indicates an antenna array with only 2 vertical antennas (and 4 horizontal antennas) .
  • antenna arrangement of 2 rows and totally 8 antennas it may result in a different channel characteristic, and thus can be indicated as a different arrangement.
  • Some other antenna configurations with the same total number may also be transparent for UE, e.g. (4 rows, 2 columns) and (1 row, 8 columns) ; (2 rows, 2 columns) and (1 row, 4 columns) ; (4 rows, 4 columns) and (2 rows, 8 columns) .
  • the predefined set may be ⁇ 1 port, 2 ports, 4 ports, 8 ports with 1 or 4 rows, 8 ports with 2 rows , 12 ports, 16 ports with 4 rows, 16 ports with 2 rows, reserved ... ⁇ which also allows multiple antenna arrangement for 16 antenna ports, and may require 4 bits to selecting one element from it.
  • a different arrangement may require new codebook design, and if the new codebook cannot introduce large performance gain compared with legacy codebook (e.g., R10 codebook) , it may be unnecessary to distinguish this antenna arrangement from other arrangements.
  • legacy codebook e.g., R10 codebook
  • new codebook design for the (2 rows, 4 columns) antenna arrangement cannot provide obvious performance gain, it may be unnecessary to distinguish it with other two 8-port antenna configurations. It may result in only one element in the predefined set for indicating 8 antenna ports.
  • the predefined set may be ⁇ 1 port, 2 ports, 4 ports, 8 ports, 12 ports, 16 ports with 4 rows, 16 ports with 2 rows, reserved ⁇ which may require 3 bits to selecting one element from it.
  • the first indicator may indicate the number of antenna ports for the reference signal by indicating an element in a predefined set, and wherein at least one elements in the predefined set may indicate that the reference signal is beamformed.
  • the predefined set may be ⁇ 1, 2, 4, 8, 12, 16, beamformed CSI-RS-based scheme, Reserved ⁇ , wherein 1, 2, 4, 8, 12 and16 stand for non-precoded CSI-RS with 1, 2, 4, 8, 12, 16 antenna ports respectively, and the 7 th element of the predefined set indicate that the CSI-RS is beamformed.
  • the 7 th element may implicitly indicate a predefined number of beams and a predefined number of antenna ports for the beamformed reference signal.
  • the 7 th element which indicates beamformed CSI-RS may further indicate implicitly no need for reporting some precoding information. For example, it may indicate implicitly that a W1 report based on measurement of the CSI-RS is not necessary, and instead, only W2 is required to be fed back.
  • the 8 th element in the example i.e., a reserved value, may be used to represent another CSI-RS scheme, e.g., a default vertically beamformed CSI-RS with 2 beams and 16 ports.
  • the predefined set can be ⁇ 1, 2, 4, 8 ports with 4 rows, 8 ports with 1 row, 12, 16, beamformed CSI-RS-based scheme ⁇ . It allows the base station to inform different antenna arrangements and whether beamforming for the CSI-RS is used to the UE.
  • transmitting the first indicator at block S201 may include transmitting the first indicator via a radio resource control (RRC) signaling, e.g., the first indicator may be indicated using a field, e.g., antennaPortsCount-r13 in a CSI-RS configuration signaling.
  • RRC radio resource control
  • the first indicator may be transmitted via any suitable signaling.
  • a CSI-RS with 16 ports and a CSI-RS with 12 ports may require different number of bits for the resource configuration indication.
  • the first indicator may indicate the number of antenna ports for the reference signal by jointly indicating the number of antenna ports for the reference signal together with the second indicator.
  • the first indicator may indicate 16 antenna ports
  • the second indicator may indicate the 11 th resource configuration candidate, which exceeds the maximum number of candidates for 16 antenna ports.
  • the first indicator and the second indicator may jointly indicate a CSI-RS with 12 antenna ports.
  • the resource configuration indicated by the second indicator is interpreted as a configuration for 12 antenna ports.
  • the second indicator indicates a resource configuration for a corresponding number of antenna ports for the reference signal at block S202, and the corresponding number of antenna ports can be different from that indicated by the first indicator at block S201.
  • the first indicator is a field denotes as antennaPortsCount-r13
  • the second indicator is a field denoted as resourceConfig-r13, in a RRC signaling CSI-RS-Config-r13.
  • the first indicator which indicates 16 antenna ports explicitly, should be interpreted as indicating 12 antenna ports.
  • the joint indication is also useful in another scenario for power boosting, where a CSI-RS with a large number of antenna ports are obtained by combining multiple (e.g., 2) CSI-RSs with a small number of antenna ports (e.g., 8 or less) , for example, multiple existing CSI-RS with 1, 2, 4, or 8 antenna ports with the configurations shown in Table 2. Take 12 antenna ports for example, it can be obtained by combining 8 antenna ports in symbols 5 and 6 of slot 0 and 4 antenna ports in symbols 2 and 3 of slot 1, as shown in Fig. 3A. In the example shown in Fig.
  • CSI-RS antenna ports (port 15/16, 19/20, 17/18, 21/22) are frequency divisionally multiplexed (FDMed) , which means, natural power boosting for one antenna port up to 4 times (6dB) can be achieved by using power of 3 NULL resource elements (REs) ; while in symbol 2 or 3 of slot 1, only two antenna ports (ports 23/24 and 25/26) are FDMed, which means power for one antenna port can be boosted by 2 times (i.e., 3dB) by using power of 1 NULL RE.
  • FDMed frequency divisionally multiplexed
  • the first indicator can indicate part of information on a resource configuration for a predefined number of antenna ports for the RS (e.g., CSI-RS) by jointly indicating the resource configuration for a corresponding number of antenna ports for the reference signal together with the second indicator, and wherein when the first indicator indicates a first predefined number of antenna ports (e.g., 12) , the second indicator may indicate a resource configuration for a second predefined number (e.g., 16) of antenna ports which is different from the first predefined number of antenna ports.
  • CSI-RS CSI-RS
  • the second indicator e.g., resourceConfig-r13
  • a CSI-RS resource including two 8-port resources is configured, and in both slot 0 and slot 1, there are 4 antenna ports FDMed, which means power boosting by 4 times is possible, as shown in Figs. 3C and 3D. That is, with this embodiment, equal power boosting capability can be achieved for slot 0 and slot 1, without causing power waste or CSI-RS coverage reduction.
  • a 12-port or 16-port CSI-RS obtained by combining multiple 8-port or 4-port CSI-RSs there can be multiple configuration candidates.
  • it may not be desirable to combine two existing CSI-RS resource configurations e.g., configurations 0 and 4 as shown in Fig.
  • the existing CSI-RS configurations for 8 ports may be indexed, for example, as shown in Fig.
  • a 16-port CSI-RS configuration can be obtained by combing two 8-port CSI-RS configurations which have contiguous indexes, e.g., a combination of ⁇ configuration 0, configuration 1 ⁇ or ⁇ configuration 2, configuration 3 ⁇ is allowed. That is, the predefined set may only include those configurations which are obtained by combining 8-port CSI-RS configurations with contiguous indexes.
  • a predefined set for 12-port CSI-RS configurations can be defined in similar way.
  • the existing CSI-RS configurations for 4 ports may be indexed, for example, as shown in Fig. 4B, and the indexes can be further arranged in an order of ⁇ 0, 5, 1, 6, 2, 7, 3, 8, 4, 9 ⁇ and then a 12-port CSI-RS configuration can be obtained by combing three 4-port CSI-RS configurations which are contiguous according to the order, e.g., a combination of ⁇ configuration 0, configuration 5, configuration 1 ⁇ or ⁇ configuration 6, configuration 2, configuration 7 ⁇ or ⁇ configuration 3, configuration 8, configuration 4 ⁇ can be allowed.
  • the predefined set for 12-port CSI-RS only includes 3 configuration candidates.
  • each 12-port configuration and 16-port configuration are obtained by combining 3 and 4 contiguous 4-port CSI-RS configurations, respectively.
  • the predefined set may include 10 elements.
  • the maximum number of candidate configurations i.e., number of elements in the predefined set
  • the maximum number of candidate configurations equals to the number of candidate configurations of the existing 4-port CSI-RS.
  • the second indicator transmitted at block S202 may indicate the resource configuration for the corresponding number of antenna ports by indicating a resource configuration from a predefined configuration set, and at least one configuration candidates in the predefined configuration set indicate a predefined resource hopping pattern for the corresponding number of antenna ports.
  • CSI-RS resource hopping which can provide better CSI-RS measurement for both beamformed CSI-RS and non-precoded CSI-RS, and realize inter-cell interference randomization.
  • the predefined resource hopping pattern may indicate resource change for at least part of the corresponding number of N antenna ports in different physical resource blocks (PRBs) or different subframes.
  • PRBs physical resource blocks
  • the base station can indicate, to the device, CSI-RS resource change in different PRBs and/or subframes, and thus allows more flexible CSI-RS configuration and interference randomization.
  • the resource for the CSI-RS may change on a per-beam basis, and the predefined resource hopping pattern may indicate the resource change in different PRBs or different subframes on a per-beam basis.
  • Examples for the per-beam resource hopping are shown in Figs. 5A-5B.
  • a 3D beamforming can be as shown in Fig. 1A, wherein each beam is obtained by antenna virtualization and transmitted from 2 antenna ports.
  • Fig. 5A shows the resource hopping for each of 6 CSI-RS beams (denoted as beam 0, beam 1, beam 2, beam 3, beam 4 and beam 5 in Fig. 5A) in subframe i and subframe j.
  • a vertical beamforming can be as shown in Fig.
  • Fig. 5B shows the resource hopping for each of 2 CSI-RS beams (denoted as beam 0 and beam 1 in Fig. 5B) in subframe i and subframe j. It can be appreciated that the frequency hopping can also be done in frequency domain, i.e., resource for a beam can be different in different PRBs, in another embodiment. In some embodiments, the resource for a beam may change with both PRB and subframe.
  • the second resource indicator may be an index, which indicating for example an element in a predefined set.
  • the predefined set may include P configurations, e.g., ⁇ 1, 2, 3, 4, ... P ⁇ , wherein some of the configuration (e.g., configurations 1 to 4) may indicate non-hopping resource configurations, while other configurations (e.g., 5 to P) may indicate resource configurations with hopping.
  • the second indicator takes a value of 5
  • it may be interpreted as a resource configuration with a predefined hopping pattern, for example, as shown in Fig. 5A.
  • a 2D antenna array is split into multiple groups and/or multiple sets based on different characteristics of antenna ports, and then the antenna ports are mapped to CSI-RS resources.
  • the resources can be as that shown in Figs. 3A, 3B and Figs. 4A and 4B.
  • the resource for a CSI-RS with more than 8 ports can be a combination of multiple existing CSI-RS configurations as shown in Table 2.
  • the CSI-RS hopping can be realized by changing the resource mapping in different frequencies (e.g., PRBs) , time instances (e.g., subframes) or, codes.
  • the hopping pattern can be default information known to both NB and UEs, e.g., the hopping pattern can be determined implicitly based on cell ID.
  • the base station e.g., eNB
  • Figs. 6B-6C provide examples for resource hopping of non-precoded CSI-RS. Though 16-port CSI-RSs are illustrated, it can be appreciated that similar hopping can be applied to CSI-RS with other number of antenna ports.
  • the 2D antenna array can be split into different antenna groups. As shown in Fig. 6B, the 16 antenna ports can be divided into 2 groups ( ⁇ 0, 4, 1, 5, 2, 6, 3, 7 ⁇ and ⁇ 8, 12, 9, 13, 10, 14, 11, 15 ⁇ ) based on antenna position, e.g., based on the index of the row of antennas.
  • the number of groups equals to the number of rows of antenna ports, and these groups from a set 0.
  • the resource for each group of antenna ports may change.
  • the resource for each group may change in different PRBs. It is shown in Fig. 6C, in another embodiment, based on antenna positions, the antenna ports may be divided into a group 0 and a group 1 which form a set 0, and based on different polarization, the antenna ports may also be divided into a group 2 and a group 3 which form a set 1, and the number of groups equals to the number of polarizations in this case. In such case, a resource hopping pattern may be defined to allow inter-set resource hopping. For example, as shown in Fig.
  • resource for antenna ports of group 0, set 0 in subframe i may be used for antenna ports of group 2, set 1 in subframes later (i.e., subframe i+n) .
  • resource for antenna ports of group 1, set 0 in subframe i may be used for antenna ports of group 3, set 1 in subframes later (i.e., subframe i+n) .
  • the resource hopping may include resource change in time, and/or frequency, and/or code domain.
  • Fig. 6D an example for CSI-RS hopping in different PRBs is illustrated.
  • 2 antenna ports groups ( ⁇ 0, 4, 1, 5, 2, 6, 3, 7 ⁇ and ⁇ 8, 12, 9, 13, 10, 14, 11, 15 ⁇ ) are obtained based on antenna position, as shown in Fig. 6B.
  • resource for antenna ports of group 0 in PRB i may be used for antenna ports of group 1 in PRB j.
  • the method 200 may further comprise transmitting a third indicator to the device for indicating whether resource hopping for the reference signal is enabled or not, at block S203. For example, if the third indicator indicates that resource hopping is enabled, the receiver may use the second indicator to select one resource configuration with hopping from a predefined resource configuration set, and if the third indicator indicates that resource hopping is not enabled, the receiver may use the second indicator to select one resource configuration without hopping from another predefined resource configuration set.
  • Fig. 7 illustrates an exemplary flowchart of a method 700 for a reference signal detection according to an embodiment of the present disclosure.
  • the reference signal can be, but not limited to, CSI-RS.
  • the method 700 may apply to detection of any suitable signals to solve similar problems.
  • the method 700 can be performed by a device, e.g., the UE 102 shown in Fig. 1D, but the present disclosure is not limited thereto.
  • the method 700 may also be performed by any other suitable device.
  • the method 700 comprises receiving, from a base station, a first indicator for indicating a number of antenna ports for the reference signal at block S701; receiving, from the base station, a second indicator for indicating a resource configuration for a corresponding number of antenna ports for the reference signal at block S702; and detecting the reference signal based on the received first indicator and the received second indicator at block S703; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not, and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and/or, wherein the second indicator further indicates a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the received first indicator and second indicator enable the device to detect the reference signals from the base station properly.
  • it can be performed in a conventional way.
  • it may comprise adjusting a CSI-RS feedback procedure based on whether the CSI-RS is beamformed for not.
  • the device may interpret the first indicator and the second indicator separately, to get the configured number of antenna ports for the reference signal, and the corresponding resource configuration. In still another embodiment, the device may interpret the first indicator and the second indicator jointly, to get the configured number of antenna ports for the reference signal, and the corresponding resource configuration.
  • the first indicator and the second indicator may be those transmitted by the base station at block S201 and block S202, and related descriptions provided with reference to Fig. 2A and method 200 will also apply here, and thus details of the first indicator and the second indicator will not be repeated here.
  • the method 700 may further comprise receiving, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled or not at block S704, and wherein detecting the reference signal based on the received first indicator and the received second indicator may comprise detecting the reference signal also based on the received third indicator.
  • a method 800 which may comprise at least one of blocks S201, S202 and S203 of the method 200, as shown in Figs. 8A-8E. That is, the method 800 may comprise block S201 only, block S202 only, block S203 only, block S201 and block S203 or, block S202 and S203.
  • the method 800 may only comprise the block S201, for configuring number of antenna ports for a reference signal. That is, with the method 800, a base station may transmit a first indicator to a device for indicating a number of antenna ports for the reference signal; and wherein the first indicator may further indicate at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal.
  • the first indicator may indicate the number of antenna ports for the reference signal by indicating an element in a predefined set, and wherein at least two elements in the predefined set may indicate a same number of antenna ports and different numbers of horizontal antenna ports.
  • the first indicator may indicate the number of antenna ports for the reference signal by indicating an element in a predefined set, and wherein at least one element in the predefined set may indicate that the reference signal is beamformed.
  • the at least one elements in the predefined set may further indicate implicitly a predefined number of beams and a predefined number of antenna ports for the reference signal.
  • the method 800 may only comprise the block S202, for configuring resource for a reference signal. That is, with the method 800, a base station may transmit a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal; and in some embodiments the second indicator may further indicate a resource hopping pattern for the corresponding number of antenna ports for the reference signal.
  • at least two configuration candidates in the predefined configuration set may indicate partly overlapped resources for the N antenna ports.
  • the second indicator may indicate the resource configuration by indicating a resource configuration for the corresponding number of antenna ports from a predefined configuration set, and at least one configuration candidates in the predefined configuration set may indicate a predefined resource hopping pattern for the corresponding number of antenna ports.
  • the predefined resource hopping pattern may indicate resource change for at least part of the corresponding number of antenna ports in different physical resource blocks or different subframes.
  • the predefined resource hopping pattern may indicate the resource change for the at least part of the corresponding number of antenna ports in different physical resource blocks or different subframes on a per-beam basis.
  • the method 800 may comprise block S203, i.e., the base station transmits a third indicator to a device for indicating whether resource hopping for a reference signal is enabled or not.
  • the method 800 may comprise block S201 and block S203, or bock S202 and block S203 in another embodiment. Since these blocks have been described above and with reference to Fig. 2A and method 200, related details will not be repeated here.
  • a method which may comprise at least one of the blocks S701, S702, S703 and S704 of the method 700.
  • the method may only comprise block S701 and S703, that is, a device may receive, from a base station, a first indicator for indicating a number of antenna ports for the reference signal at block S701, wherein the first indicator may further indicate at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not, and part of information on a resource configuration for a predefined number of antenna ports for the reference signal; and the device detect the reference signal based on the received first indicator at block S703.
  • the method may only comprise block S702 and S703, that is,the device may receive, from a base station, a second indicator for indicating resource allocation for a corresponding number of antenna ports for the reference signal at block S702, wherein the second indicator may further indicate a resource hopping pattern for the indicated number of antenna ports for the reference signal; and the device detect the reference signal based on the received second indicator at block S703.
  • the method may comprise block S704, i.e., the device may receive, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled, and at block S703, the device may detect the reference signal based on the received third indicator.
  • Fig. 9 illustrates a schematic block diagram of an apparatus 900 in a wireless system for configuring a reference signal according to an embodiment of the present disclosure.
  • the apparatus 900 may be implemented as a base station, or a part thereof.
  • the apparatus 900 may be implemented as any other suitable network element in the wireless communication system.
  • the apparatus 900 is operable to carry out the example method 200 described with reference to Fig. 2A, or method 800, and possibly any other processes or methods. It is also to be understood that the method 200 or 800 is not necessarily carried out by the apparatus 900. At least some blocks of the method 200 or 800 can be performed by one or more other entities.
  • the apparatus 900 may comprise a first transmitting unit 901, configured to transmit a first indicator to a device for indicating a number of antenna ports for the reference signal; wherein the first indicator may further indicate at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal.
  • the apparatus 900 may comprise a second transmitting unit 902, configured to transmit a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal, wherein the corresponding number may be related to the number indicated by the first indicator; and wherein the second indicator may further indicate a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • a second transmitting unit 902 configured to transmit a second indicator to the device for indicating a resource configuration for a corresponding number of antenna ports for the reference signal, wherein the corresponding number may be related to the number indicated by the first indicator; and wherein the second indicator may further indicate a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the apparatus 900 may comprise a third transmitting unit 903, configured to transmit a third indicator to the device for indicating whether resource hopping for the reference signal is enabled.
  • a schematic block diagram of an apparatus 1000 in a wireless system for detecting a reference signal is illustrated.
  • the apparatus 1000 may be implemented as a device, e.g., UE 102 shown in Fig. 1D, or a part thereof. Altematively or additionally, the apparatus 1000 may be implemented as any other suitable devices in the wireless communication system.
  • the apparatus 1000 is operable to carry out at least part of the example method 700 described with reference to Fig. 7, and possibly any other processes or methods. It is also to be understood that the method 700 is not necessarily carried out by the apparatus 1000. At least some blocks of the method 700 can be performed by one or more other entities.
  • the apparatus 1000 may comprise a first receiving unit 1001, configured to receive, from a base station, a first indicator for indicating a number of antenna ports for the reference signal; wherein the first indicator further indicates at least one of: a number of horizontal antenna ports and a number of vertical antenna ports for the reference signal, whether the reference signal is beamformed or not; and part of information on a resource configuration for a predefined number of antenna ports for the reference signal.
  • the apparatus 1000 may comprise a second receiving unit 1002, configured to receive from the base station a second indicator for indicating a resource configuration for a corresponding number of antenna ports for the reference signal; wherein the second indicator may further indicate a resource hopping pattern for the indicated number of antenna ports for the reference signal.
  • the apparatus 100 may comprise a third receiving unit 1004, configured to receive, from the base station, a third indicator for indicating whether resource hopping for the reference signal is enabled.
  • the apparatus 1000 may comprise a detection unit 1003, configured to detect the reference signal based on the received first indicator and/or the received second indicator, and/or the received third indicator.
  • modules in the apparatus 900 and 1000 can be combined in some implementations.
  • Fig. 11 illustrates a simplified block diagram of an apparatus 1110, and an apparatus 1120 that are suitable for use in practicing the embodiments of the present disclosure.
  • the apparatus 1110 may be a base station; the apparatus 1120 may be a UE.
  • the apparatus 1110 comprises at least one processor 1111, such as a data processor (DP) and at least one memory (MEM) 1112 coupled to the processor 1111.
  • the apparatus may further comprise a suitable RF transmitter TX and receiver RX 1113 (which may be implemented in a single component or separate components) coupled to the processor 1111.
  • the MEM 1112 stores a program (PROG) 1114.
  • the PROG 1114 may include instructions that, when executed on the associated processor 1111, enable the apparatus 1110 to operate in accordance with the embodiments of the present disclosure, for example to perform the method 200 or 800.
  • the TX/RX 1113 may be used for bidirectional radio communication with other apparatuses or devices in the network, e.g. the apparatus 1120.
  • TX/RX 1113 may have multiple antennas (e.g., an AAS) to facilitate the communication.
  • a combination of the at least one processor 1111 and the at least one MEM 1112 may form processing means 1115 adapted to implement various embodiments of the present disclosure.
  • the apparatus 1120 comprises at least one processor 1121, such as a DP, at least one MEM 1122 coupled to the processor 1121.
  • the apparatus 1120 may further comprise a suitable RF TX/RX 1123 (which may be implemented in a single component or separate components) coupled to the processor 1121.
  • the MEM 1122 stores a PROG 1124.
  • the PROG 1124 may include instructions that, when executed on the associated processor 921, enable the apparatus 1120 to operate in accordance with the embodiments of the present disclosure, for example to perform the method 700 or part of it.
  • the TX/RX 1123 is for bidirectional radio communications with other apparatuses or devices in the network, e.g. the apparatus 1110. Note that the TX/RX 1123 may have multiple antennas to facilitate the communication.
  • a combination of the at least one processor 1121 and the at least one MEM 1122 may form processing means 1125 adapted to implement various embodiments of the present disclosure.
  • Various embodiments of the present disclosure may be implemented by computer program executable by one or more of the processor 1111, 1121 in software, firmware, hardware or in a combination thereof.
  • the MEMs 1112, 1122 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one MEM is shown in the apparatuses 1110, 1120, there may be several physically distinct memory units in them.
  • the processors 1111, 1121 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • Each of the apparatuses 1110, 1120 may have multiple processors, such as an application specific integrated circuit (ASIC) chip that is slaved in time to a clock which synchronizes the main processor.
  • ASIC application specific integrated circuit
  • the present disclosure provides a carrier containing the computer program as mentioned above, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • the computer readable storage medium can be, for example, an optical compact disk or an electronic memory device like a RAM (random access memory) , a ROM (read only memory) , Flash memory, magnetic tape, CD-ROM, DVD, Blue-ray disc and the like.
  • an apparatus implementing one or more functions of a corresponding apparatus described with an embodiment comprises not only prior art means, but also means for implementing the one or more functions of a corresponding apparatus described with an embodiment and it may comprise separate means for each separate function, or means may be configured to perform two or more functions.
  • these techniques may be implemented in hardware (one or more apparatuses) , firmware (one or more apparatuses) , software (one or more modules) , or combinations thereof.
  • firmware or software implementation may be made through modules (e.g., procedures, functions, and so on) that perform the functions described herein.

Abstract

Des modes de réalisation de la présente invention concernent un procédé de configuration d'un signal de référence dans un système sans fil. Le procédé consiste à : transmettre un premier indicateur à un dispositif, pour indiquer un nombre de ports d'antenne pour le signal de référence ; et transmettre un deuxième indicateur au dispositif, pour indiquer une configuration de ressources pour un nombre correspondant de ports d'antenne pour le signal de référence. Le nombre correspondant se rapporte au nombre indiqué par le premier indicateur, le premier indicateur indiquant en outre : un nombre de ports d'antenne horizontale et/ou un nombre de ports d'antenne verticale pour le signal de référence ; le fait que le signal de référence est en forme de faisceau ou non ; et une partie d'informations sur une configuration de ressources pour un nombre prédéfini de ports d'antenne pour le signal de référence ; et/ou le deuxième indicateur indique en outre un motif de saut de ressources pour le nombre indiqué de ports d'antenne pour le signal de référence. L'invention concerne également un procédé de détection de signaux en fonction du motif de transmission. Des modes de réalisation de la présente invention concernent également un appareil correspondant.
PCT/CN2015/083946 2015-07-14 2015-07-14 Procédé et appareil de configuration et de détection de signal de référence WO2017008236A1 (fr)

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