CN111510873A - Downlink control method and signaling for multipoint transmission - Google Patents

Downlink control method and signaling for multipoint transmission Download PDF

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Publication number
CN111510873A
CN111510873A CN201910028635.5A CN201910028635A CN111510873A CN 111510873 A CN111510873 A CN 111510873A CN 201910028635 A CN201910028635 A CN 201910028635A CN 111510873 A CN111510873 A CN 111510873A
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sending
transmission
control resource
downlink
resource group
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CN201910028635.5A
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CN111510873B (en
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焦慧颖
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China Academy of Information and Communications Technology CAICT
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China Academy of Information and Communications Technology CAICT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies

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

Abstract

The application discloses a downlink control method for multi-point transmission, which is characterized in that a control resource group is configured for each transmission point, and the control resource groups of different transmission points are mutually orthogonal; sending configuration information to the terminal equipment, wherein the configuration information comprises a sending point identifier and a control resource group; MAC CE sending down control signaling to terminal equipment activates the sending beam direction of at least one control resource group, and or sends configuration information to the terminal equipment to indicate the terminal to activate TCI state related to the sending point; and the terminal equipment receives downlink control information for scheduling service data in the activated at least one control resource group, and/or determines the beam direction of a transmitting point according to the configuration information and receives the service data. The application also discloses a downlink signaling for multipoint transmission. The technical scheme of the application improves the reliability of the terminal equipment for receiving the downlink control information and the downlink service data sent by the multipoint.

Description

Downlink control method and signaling for multipoint transmission
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a downlink control method and downlink signaling for multipoint transmission.
Background
The new wireless communication (5G NR) system supports a multi-beam transmission mechanism, and the R16 version is to further enhance a plurality of transmission points to transmit data, thereby further enhancing the reliability and robustness and supporting joint transmission.
The existing beam indication process of the single-panel control channel and the service data channel is that firstly, RRC signaling configures a TCI state pool of the service data channel, at most 8 TCI states are activated in PDSCH MAC CE, then the TCI state of the service data channel is indicated in Downlink Control Information (DCI), and a TCI corresponding to a control resource group (CORSET) is indicated in PDCCH MACCE.
In multi-transmission point (TRP), in order to enhance UR LL C traffic control channel reliability, the downlink control channel can be repeatedly transmitted at multiple transmission points, and in order to enhance UR LL C traffic data channel reliability, the downlink data scheduled by the downlink control channel transmitted by each transmission point is repeatedly transmitted.
Disclosure of Invention
The application provides a downlink control method and signaling for multipoint transmission, which solve the problem of how to receive downlink control information and downlink service data with high reliability when the downlink multipoint transmission is carried out.
The embodiment of the application provides a downlink control method for multipoint transmission, which comprises the following steps:
configuring a control resource group for each transmission point (TRP), wherein the control resource groups of different transmission points are mutually orthogonal;
and sending configuration information to the terminal equipment, wherein the configuration information comprises a sending point identifier and a control resource group.
Further, the method further comprises the steps of: and the MAC CE sending the downlink control signaling to the terminal equipment activates the transmission beam direction of each control resource group.
Further, the method further comprises the steps of: and the terminal equipment receives downlink control information for scheduling the service data in the activated at least one control resource group.
In any one of the method embodiments of the present application, preferably, the method further comprises the following steps: transmitting MAC CE information to the terminal equipment, indicating the terminal to activate a TCI state related to a transmitting point, and indicating the transmitting beam direction of a downlink data channel; further, the terminal device determines the beam direction of the transmitting point according to the configuration information, and receives the service data. Preferably, the number of activated transmission points is plural, and the beam direction of each transmission point is different.
In any one of the method embodiments of the present application, preferably, each sending point identifier corresponds to 1 to 3 control resource groups.
In any one of the method embodiments of the present application, preferably, the configuration information includes a plurality of sending point identifiers.
The embodiment of the present application further provides a downlink signaling for multipoint transmission, including a transmission point identifier and a control resource group corresponding to the transmission point identifier. Preferably, the method further includes a transmission beam direction of a control resource group corresponding to the transmission point identifier or a transmission beam direction of a downlink data channel.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the scheme of the application further enhances the RRC signaling and the MAC CE in the prior art. Firstly, the configuration of the RRC signaling to the downlink control resources is enhanced, the control resources of different sending points are ensured to be orthogonal, and the diversity characteristics of the control information can be obtained when the beam directions of the control resources of different sending points are different. And secondly, enhancing the MAC CE of the downlink data channel to ensure that the transmission beams of the downlink data scheduled by different transmission point control information are different, thereby obtaining the diversity characteristic of the data information.
Compared with the prior art, the maximum number of the control resource groups configured to the terminal is increased from 3 to 3 times of the number of the sending points. The transmitting point identification of the high-level control configuration control resource group is added, the TCI states of the control resource groups of different transmitting points are different, the diversity is increased, and the reliability of the downlink control channel can be obtained. The MAC CE of the downlink data channel increases the sending point identification, ensures different TCI states activated by different sending points, increases the diversity of the downlink data and can obtain the reliability of receiving the downlink data.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow diagram of an embodiment of a high level configuration of snoop control resources;
fig. 2 is a flowchart of an embodiment of a terminal device receiving service data;
fig. 3 is a schematic diagram of an embodiment of downlink signaling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the patent discusses the multipoint downlink transmission, in order to increase the reliability of the downlink control channel and the downlink data, the sending point identifier corresponding to the control resource group is added in the RRC signaling, and different sending points configure orthogonal control resource group resources, so as to ensure that the repetition of the control channels of different sending points is orthogonal. Each transmission point is configured with a maximum of 3 control resource groups. One search space corresponds to one control resource group of one transmission point.
In order to ensure reliable transmission of data, the MAC CE is improved to ensure that the activated TCI state of each transmission point is different, and the reliable reception of downlink data is ensured.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an embodiment of configuring a snoop control resource at a higher layer.
The embodiment of the application provides a downlink control method for multipoint transmission, which comprises steps 11-14.
Step 11, the terminal equipment acquires configuration information, wherein the configuration information is used for sending an instruction by the terminal equipment and comprises the number of sending points and the number of control resource groups corresponding to each sending point; the configuration information makes the resources of the control resource group of each transmission point orthogonal.
In step 11, for example, the base station apparatus transmits configuration information including a transmission point identifier and a control resource group to the terminal apparatus. And configuring a control resource group for each transmitting point, wherein the control resource groups of different transmitting points are mutually orthogonal. The configuration information includes a plurality of sending point identifiers. Preferably, each sending point identifier corresponds to 1-3 control resource groups.
For example, a transmission point identifier (TRP ID) is added to the higher layer configuration signaling (RRC) to indicate for which transmission point the set of control resources is to transmit downlink control signaling. And configuring the maximum 3 control resource groups for each sending point by the terminal through the high-level configuration information, so that the terminal can be configured with the control resource groups with 3 times of the sending points at most. When the base station configures the control resource group resources, the control resource group resources of different sending points are ensured to be orthogonal, so that when the control channels of different sending points are repeatedly sent, the terminal can accurately solve the control resource group resources, and the reliability of control information is ensured.
The number of downlink transmission points is configurable, and the physical maximum number depends on the number of transmission antennas and the number of panels of the base station equipment. When using the transmission point identification, it is also limited to the number of identified bits, e.g., a maximum of 128 are supported.
Step 12, the terminal device determines that N transmission points are transmitting and M control resource groups (for example, M is 3) of each transmission point according to the configuration information;
step 13, the terminal device detects Downlink Control Information (DCI) in the corresponding search space according to the configured control resource group;
here, the downlink control information is searched, detected, and then received. The search space of the terminal device corresponds to a control resource group of a transmitting point.
And step 14, the terminal equipment activates the beam directions of different control resource groups according to the configuration information by combining with the MAC CE of the PDCCH, and repeatedly receives the downlink control information in different beam directions at different transmitting points.
In step 14, for example, the MAC CE that the base station device sends downlink control signaling to the terminal device activates the transmission beam direction of each control resource group.
Further, the method also comprises the following steps: and the terminal equipment receives downlink control information in the direction of the activated transmission beam of at least one control resource group for scheduling service data.
In this embodiment, the TCI states of different control resource groups are activated by the MAC CE, that is, different beams are used, so as to obtain spatial diversity gain and improve reliability.
Fig. 2 is a flowchart of an embodiment of receiving service data by a terminal device.
The embodiment of the application also provides a downlink control method for multipoint transmission, which comprises the steps of 21-23.
Step 21, the terminal device obtains configuration information, the configuration information indicates the terminal device to activate a TCI state related to a transmitting point, and the TCI state is used for indicating a transmitting beam direction of a downlink data channel of the transmitting point;
in step 21, for example, the base station device sends configuration information to the terminal device, indicating that the terminal activates a TCI state associated with a sending point, for indicating a sending beam direction;
step 22, the terminal equipment determines the beam direction of the transmitting point according to the configuration information;
specifically, the activated TCI state of the scheduled data corresponding to each transmitting point is determined according to the configuration information, so that the beam direction available for each transmitting point to transmit the data is determined. That is, the beam directions of these transmission points are activated.
Preferably, the number of activated transmission points is plural. The number of activations is configurable, with the range of numbers determined by the sending point identity.
And step 23, the terminal equipment receives the service data in the beam direction of the activated sending point.
When the number of the activated sending points is multiple, the terminal equipment activates the beam direction of the downlink data sending of different sending points according to the configuration information, so that the downlink data which is dispatched by different sending points in multiple ways is ensured to be repeatedly received in different beam directions, and the reliability is obtained.
Fig. 3 is a schematic diagram of an embodiment of downlink signaling.
The embodiment of the present application further provides a downlink signaling for multipoint transmission, including a transmission point identifier (TRPID) and a control resource group corresponding to the transmission point identifier. Preferably, the method further includes transmitting beam directions (e.g., Oct 3 to Oct N) of the downlink data channels corresponding to the transmitting point identifiers.
It should be noted that the present embodiment implements MAC CE optimization of a traffic data channel. The terminal detects DCI corresponding to the transmission points in the control resource group, and the DCI is used for scheduling data of each transmission point. In order to make the wave beams corresponding to the downlink data sent by each sending point different, and obtain the space diversity gain of the downlink received data, a sending point identifier is added in the downlink MAC CE to indicate different downlink sending points, so that the activated TCI states of each different sending point are different, thereby ensuring that the PDSCH sent by different sending points uses different wave beams, obtaining the space diversity gain, and ensuring the reliability of data sending.
Preferably, the downlink signaling includes a transmission beam direction of a control resource group corresponding to the transmission point identifier. For example, the terminal device is instructed to activate the transmission beam direction corresponding to the control resource group through the MAC CE.
It should be noted that "downlink signaling" proposed in the present application is a generic term of downlink control information. For example, the downlink signaling may include RRC signaling, which is used to transmit a sending point identifier corresponding to a control resource group; the downlink signaling may also include MAC CE signaling, which is used as control signaling sent by downlink control channel multiple points, or control signaling sent by downlink data channel multiple points; the RRC and the MAC CE are only used as the best embodiment of the application; the downlink signaling may also include any other signaling that is implemented to transmit the control information described herein, and is not limited in any way, within the scope of the knowledge of those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A downlink control method for multipoint transmission is characterized by comprising the following steps:
configuring a control resource group for each sending point, wherein the control resource groups of different sending points are mutually orthogonal;
and sending configuration information to the terminal equipment, wherein the configuration information comprises a sending point identifier and a control resource group.
2. The method of claim 1, further comprising the steps of:
and the MAC CE sending the downlink control signaling to the terminal equipment activates the transmission beam direction of each control resource group.
3. The method of claim 2, further comprising the steps of:
and the terminal equipment receives downlink control information for scheduling the service data in the activated at least one control resource group.
4. The method according to any one of claims 1 to 3, further comprising the steps of:
and sending MAC CE information to the terminal equipment, indicating the terminal to activate a TCI state related to a sending point, and indicating the sending beam direction of a downlink data channel.
5. The method according to any one of claims 1 to 3, wherein each sending point identifier corresponds to 1 to 3 control resource groups.
6. The method according to any one of claims 1 to 3, wherein the configuration information includes a plurality of sending point identifiers.
7. The method of claim 4, further comprising the steps of:
and the terminal equipment determines the beam direction of the transmitting point according to the configuration information and receives the service data.
8. The method of claim 4, wherein the number of activated transmission points is plural, and the beam direction of each transmission point is different.
9. A downlink signaling for multipoint transmission is characterized by comprising a transmission point identifier and a control resource group corresponding to the transmission point identifier.
10. The downlink signaling of claim 9, wherein the control resource group corresponding to the transmission point identifier comprises a transmission beam direction of the control resource group or a transmission beam direction of the downlink data channel.
CN201910028635.5A 2019-01-11 2019-01-11 Downlink control method and signaling for multipoint transmission Active CN111510873B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114390581A (en) * 2020-10-20 2022-04-22 维沃移动通信有限公司 Channel state information reporting method, device and terminal
WO2022152307A1 (en) * 2021-01-18 2022-07-21 维沃移动通信有限公司 Beam indication method, network device, and terminal device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103999375A (en) * 2011-12-16 2014-08-20 Lg电子株式会社 Method and apparatus for resource mapping for physical channel in multiple cell system
CN107872833A (en) * 2016-09-26 2018-04-03 电信科学技术研究院 Data transmission method and device in a kind of wireless network
WO2018064407A1 (en) * 2016-09-28 2018-04-05 Idac Holdings, Inc. Efficient broadcast channel in beamformed systems for nr
CN108023697A (en) * 2016-11-03 2018-05-11 华为技术有限公司 A kind of resource indicating method, relevant device and system
CN108631934A (en) * 2017-03-24 2018-10-09 华为技术有限公司 A kind of data transmission method, terminal device and base station system
WO2018204590A1 (en) * 2017-05-04 2018-11-08 Ntt Docomo, Inc. Method of acquiring channel state information (csi), user equipment (ue), and transmission and reception point (trp)
CN108809586A (en) * 2017-05-05 2018-11-13 维沃移动通信有限公司 Sending method, method of reseptance, network side equipment and the terminal device of information
CN109076412A (en) * 2016-05-13 2018-12-21 高通股份有限公司 Cell selection based on uplink
CN109155948A (en) * 2016-03-30 2019-01-04 Idac控股公司 For executing the method and apparatus of physical layer moving process

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103999375A (en) * 2011-12-16 2014-08-20 Lg电子株式会社 Method and apparatus for resource mapping for physical channel in multiple cell system
CN109155948A (en) * 2016-03-30 2019-01-04 Idac控股公司 For executing the method and apparatus of physical layer moving process
CN109076412A (en) * 2016-05-13 2018-12-21 高通股份有限公司 Cell selection based on uplink
CN107872833A (en) * 2016-09-26 2018-04-03 电信科学技术研究院 Data transmission method and device in a kind of wireless network
WO2018064407A1 (en) * 2016-09-28 2018-04-05 Idac Holdings, Inc. Efficient broadcast channel in beamformed systems for nr
CN108023697A (en) * 2016-11-03 2018-05-11 华为技术有限公司 A kind of resource indicating method, relevant device and system
CN108631934A (en) * 2017-03-24 2018-10-09 华为技术有限公司 A kind of data transmission method, terminal device and base station system
WO2018204590A1 (en) * 2017-05-04 2018-11-08 Ntt Docomo, Inc. Method of acquiring channel state information (csi), user equipment (ue), and transmission and reception point (trp)
CN108809586A (en) * 2017-05-05 2018-11-13 维沃移动通信有限公司 Sending method, method of reseptance, network side equipment and the terminal device of information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114390581A (en) * 2020-10-20 2022-04-22 维沃移动通信有限公司 Channel state information reporting method, device and terminal
CN114390581B (en) * 2020-10-20 2023-08-08 维沃移动通信有限公司 Channel state information reporting method, device and terminal
WO2022152307A1 (en) * 2021-01-18 2022-07-21 维沃移动通信有限公司 Beam indication method, network device, and terminal device

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