CN117527169A

CN117527169A - Communication method, device and storage medium

Info

Publication number: CN117527169A
Application number: CN202210912378.3A
Authority: CN
Inventors: 王中振; 韩小江
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2024-02-06
Also published as: WO2024021862A1

Abstract

The embodiment of the application discloses a communication method, a device and a storage medium. The method is applied to a single port communication system. The terminal receives a first signaling; determining a first relation corresponding to the single-port communication system according to the DMRS-Type and the maxLength in the first signaling, wherein in the first relation, the number of candidate antenna ports corresponding to each candidate value in at least one candidate value of the antenna port field is 1, receiving DCI, determining a corresponding antenna port according to one value in at least one candidate value indicated by the antenna port field in the DCI, and receiving the DMRS on the determined antenna port. According to the embodiment of the application, aiming at the single-port communication system, the relation of the candidate antenna ports corresponding to each candidate value in at least one candidate value of the new antenna port field is defined, the number of bits required by the antenna port field is reduced, and therefore signaling overhead for indicating the DMRS antenna ports is saved.

Description

Communication method, device and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communications method, an apparatus, and a storage medium.

Background

The existing demodulation reference signal (demodulation reference signal, DMRS) port allocation scheme of the New radio access technology (New radio access technology, new RAT) (abbreviated as "NR") has higher flexibility, and different tables are defined for different types of DMRS (DMRS-Type) and different maximum time domain symbol lengths (maxLength) allowed by the pre-DMRS. However, for a single port communication system, the number of ports actually required may be less than the number of ports enumerated in the existing table, so that many enumeration values in the existing table become invalid, which results in large signaling overhead and waste of transmission resources.

Disclosure of Invention

The application provides a communication method, a device and a storage medium, so as to reduce signaling overhead of a DMRS antenna port of a terminal in a single-port communication system.

In a first aspect, a communication method is provided, applied to a terminal in a single-port communication system, the method including: receiving a first signaling, wherein the first signaling comprises a Type DMRS-Type of a demodulation reference signal (DMRS) and a maximum time domain symbol length maxLength allowed by a pre-DMRS; determining a first relation corresponding to the single-port communication system according to the dmrs-Type and the maxLength, wherein the first relation comprises at least one candidate value of an antenna port field in Downlink Control Information (DCI) and candidate antenna ports corresponding to each candidate value in at least one candidate value of the antenna port field in the DCI, and the number of the candidate antenna ports corresponding to each candidate value in the first relation is 1; receiving the DCI, the DCI including an antenna port field for indicating one of at least one candidate values of the antenna port field in the DCI; determining an antenna port corresponding to the indicated one value according to the indicated one value; and receiving a DMRS on the determined antenna port.

In this aspect, for a single port communication system, a relationship of candidate antenna ports corresponding to each of at least one candidate value of a new antenna port field is defined, and a terminal may receive a DMRS on an antenna port determined according to the relationship. Compared with the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the existing antenna port field, the number of bits required by the antenna port field is reduced, so that the signaling overhead for indicating the DMRS antenna port is saved.

In one possible implementation, the first relation further includes a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI; the method further comprises the steps of: determining the number of DMRS code division multiplexing groups of non-mapped data corresponding to one value of the indication according to the first relation; determining the time-frequency domain position of the data on the antenna port according to the determined number of the DMRS code division multiplexing groups without mapping the data; and receiving the data at the determined time-frequency domain location.

In this implementation, by determining the number of DMRS code division multiplexing groups that do not map data corresponding to one of at least one candidate value indicated by the antenna port field, it is possible to determine whether data is mapped on the antenna port and the time-frequency domain position of the data on the antenna port, at which data is received, and accuracy of the received data can be improved.

In a second aspect, a communication method is provided, applied to a network device in a single port communication system, the method comprising: transmitting a first signaling, wherein the first signaling comprises a Type DMRS-Type of a demodulation reference signal (DMRS) and a maximum time domain symbol length maxLength allowed by a pre-DMRS; determining a first relation corresponding to the single-port communication system according to the dmrs-Type and the maxLength, wherein the first relation comprises at least one candidate value of an antenna port field in Downlink Control Information (DCI) and candidate antenna ports corresponding to each candidate value in at least one candidate value of the antenna port field in the DCI, and the number of the candidate antenna ports corresponding to each candidate value in the first relation is 1; transmitting the DCI, the DCI including an antenna port field for indicating one of at least one candidate values of the antenna port field in the DCI; determining an antenna port corresponding to the indicated one value according to the indicated one value; and transmitting the DMRS on the determined antenna port.

In this aspect, for a single port communication system, a relationship of candidate antenna ports corresponding to each of at least one candidate value of a new antenna port field is defined such that a terminal can receive DMRS on an antenna port determined from the relationship. Compared with the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the existing antenna port field, the number of bits required by the antenna port field is reduced, so that the signaling overhead for indicating the DMRS antenna port is saved.

In one possible implementation, the first relation further includes a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI; the method further comprises the steps of: determining the number of DMRS code division multiplexing groups of non-mapped data corresponding to one value of the indication according to the first relation; determining the time-frequency domain position of the data on the antenna port according to the determined number of the DMRS code division multiplexing groups without mapping the data; and transmitting the data at the determined time-frequency domain location.

In this implementation, by determining the number of DMRS code division multiplexing groups that do not map data corresponding to one of at least one candidate value indicated by the antenna port field, it is possible to determine whether data is mapped on the antenna port and the time-frequency domain position of the data on the antenna port, and to transmit the data at the time-frequency domain position, it is possible to improve the accuracy of transmitting the data.

In a third aspect, a communication device is provided. The communication device may implement the method of the first aspect described above. The communication means may be, for example, a terminal or a system-on-chip of a terminal. The above method may be implemented by software, hardware, or by hardware executing corresponding software.

In one possible implementation, the apparatus includes: a transceiver unit and a processing unit; wherein: the receiving and transmitting unit is configured to receive a first signaling, where the first signaling includes a Type DMRS-Type of a demodulation reference signal DMRS and a maximum time domain symbol length maxLength allowed by a preamble DMRS; the processing unit is configured to determine a first relationship corresponding to the single port communication system according to the dmrs-Type and the maxLength, where the first relationship includes at least one candidate value of an antenna port field in downlink control information DCI and a candidate antenna port corresponding to each candidate value of at least one candidate value of the antenna port field in the DCI, and the number of candidate antenna ports corresponding to each candidate value in the first relationship is 1; the transceiver unit is further configured to receive the DCI, where the DCI includes an antenna port field, where the antenna port field is configured to indicate one value of at least one candidate value of the antenna port field in the DCI; the processing unit is further configured to determine an antenna port corresponding to the indicated one value according to the indicated one value; and the transceiver unit is further configured to receive a DMRS on the determined antenna port.

Optionally, the first relation further includes a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI; the processing unit is further configured to determine, according to the first relationship, a number of DMRS code division multiplexing groups of unmapped data corresponding to one value of the indication; the processing unit is further configured to determine a time-frequency domain position of the data on the antenna port according to the determined number of DMRS code division multiplexing groups that do not map the data; and the receiving and transmitting unit is further used for receiving the data at the determined time-frequency domain position.

In a fourth aspect, a communication device is provided. The communication device may implement the method in the second aspect described above. The communication means may be, for example, a network device or a system-on-chip in a network device. The above method may be implemented by software, hardware, or by hardware executing corresponding software.

In one possible implementation, the apparatus includes: a transceiver unit and a processing unit; wherein: the receiving and transmitting unit is configured to send a first signaling, where the first signaling includes a Type DMRS-Type of a demodulation reference signal DMRS and a maximum time domain symbol length maxLength allowed by a preamble DMRS; the processing unit is configured to determine a first relationship corresponding to the single port communication system according to the dmrs-Type and the maxLength, where the first relationship includes at least one candidate value of an antenna port field in downlink control information DCI and a candidate antenna port corresponding to each candidate value of at least one candidate value of the antenna port field in the DCI, and the number of candidate antenna ports corresponding to each candidate value in the first relationship is 1; the transceiver unit is further configured to send the DCI, where the DCI includes an antenna port field, where the antenna port field is configured to indicate one value of at least one candidate value of the antenna port field in the DCI; the processing unit is further configured to determine an antenna port corresponding to the indicated one value according to the indicated one value; and the transceiver unit is further configured to send a DMRS on the determined antenna port.

Optionally, the first relation further includes a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI; the processing unit is further configured to determine, according to the first relationship, a number of DMRS code division multiplexing groups of unmapped data corresponding to one value of the indication; the processing unit is further configured to determine a time-frequency domain position of the data on the antenna port according to the determined number of DMRS code division multiplexing groups that do not map the data; and the receiving and transmitting unit is further configured to transmit the data at the determined time-frequency domain position.

In another possible implementation, the communication device includes a processor coupled to a memory; the processor is configured to support the apparatus to perform corresponding functions in the communication method described above. The memory is used to couple with the processor, which holds the computer program (or computer-executable instructions) and/or data necessary for the device. Optionally, the communication device may further comprise a communication interface for supporting communication between the device and other network elements, such as transmission or reception of data and/or signals. By way of example, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface. Alternatively, the memory may be located within the communication device and integrated with the processor; or may be external to the communication device.

In yet another possible implementation manner, the communication device includes a processor and a transceiver, where the processor is coupled to the transceiver, and the processor is configured to execute a computer program or instructions to control the transceiver to receive and transmit information; the processor is also adapted to implement the above-described methods by logic circuits or executing code instructions when the processor executes the computer program or instructions. The transceiver may be a transceiver, a transceiver circuit, an interface circuit, or an input/output interface, and is configured to receive signals from other communication devices other than the communication device and transmit the signals to the processor or send the signals from the processor to the other communication devices other than the communication device. When the communication device is a chip, the transceiver is a transceiver circuit or an input/output interface.

When the communication device is a chip, the transmitting unit may be an output unit, such as an output circuit or a communication interface; the receiving unit may be an input unit such as an input circuit or a communication interface. When the communication device is a terminal, the transmitting unit may be a transmitter or a transmitter; the receiving unit may be a receiver or a receiver.

With reference to the first aspect to the fourth aspect, in a further possible implementation manner, the DMRS on the antenna port is used to demodulate data on the antenna port.

In this implementation, by determining an antenna port indicated by an antenna port field in DCI according to a first relationship corresponding to a single-port communication system, and transmitting DMRS on the antenna port, data may also be transmitted on the antenna port, where the DMRS is used to demodulate data on the antenna port, thereby improving accuracy of data demodulation.

With reference to the first to fourth aspects, in a further possible implementation manner, the dmrs-Type is 1, and the maxLength is 1;

the value of the antenna port field is 0, the number of the DMRS code division multiplexing groups without mapping data is 1, and the antenna port is 0;

the value of the antenna port field is 1, the number of the DMRS code division multiplexing groups without mapping data is 1, and the antenna port is 1;

the value of the antenna port field is 2, the number of the DMRS code division multiplexing groups without mapping data is 2, and the antenna port is 0;

the value of the antenna port field is 3, the number of the DMRS code division multiplexing groups without mapping data is 2, and the antenna port is 1;

The value of the antenna port field is 4, the number of the DMRS code division multiplexing groups without mapping data is 2, and the antenna port is 2;

the value of the antenna port field is 5, the number of the DMRS code division multiplexing groups without mapping data is 2, and the number of the antenna ports is 3.

In this implementation, for a single port communication system, candidate antenna ports corresponding to each of at least one candidate value of the antenna port field are defined when dmrs-Type is 1 and maxLength is 1.

With reference to the first aspect to the fourth aspect, in a further possible implementation manner, the first relation further includes a number of preamble symbols corresponding to each of at least one candidate value of an antenna port field in the DCI, the dmrs-Type is 1, and the maxLength is 2;

the value of the antenna port field is 0, the number of the DMRS code division multiplexing groups without mapping data is 1, the antenna port is 0, and the number of the preamble symbols is 1;

the value of the antenna port field is 1, the number of the DMRS code division multiplexing groups without mapping data is 1, the number of the antenna ports is 1, and the number of the preamble symbols is 1;

the value of the antenna port field is 2, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 0, and the number of the preamble symbols is 1;

The value of the antenna port field is 3, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 1, and the number of the preamble symbols is 1;

the value of the antenna port field is 4, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 2, and the number of the preamble symbols is 1;

the value of the antenna port field is 5, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 3, and the number of the preamble symbols is 1;

the value of the antenna port field is 6, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 0, and the number of the preamble symbols is 2;

the value of the antenna port field is 7, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 1, and the number of the preamble symbols is 2;

the value of the antenna port field is 8, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 2, and the number of the preamble symbols is 2;

the value of the antenna port field is 9, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 3, and the number of the preamble symbols is 2;

The value of the antenna port field is 10, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 4, and the number of the preamble symbols is 2;

the value of the antenna port field is 11, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 5, and the number of the preamble symbols is 2;

the value of the antenna port field is 12, the number of the DMRS code division multiplexing groups without mapping data is 2, the number of the antenna ports is 6, and the number of the preamble symbols is 2;

the value of the antenna port field is 13, the number of DMRS code division multiplexing groups of the unmapped data is 2, the number of the antenna ports is 7, and the number of the preamble symbols is 2.

In this implementation, for a single port communication system, candidate antenna ports corresponding to each of at least one candidate value of the antenna port field are defined when dmrs-Type is 1 and maxLength is 2.

With reference to the first to fourth aspects, in a further possible implementation manner, the dmrs-Type is 2, and the maxLength is 1;

the value of the antenna port field is 5, the number of the DMRS code division multiplexing groups without mapping data is 2, and the antenna port is 3;

the value of the antenna port field is 6, the number of the DMRS code division multiplexing groups without mapping data is 3, and the antenna port is 0;

the value of the antenna port field is 7, the number of the DMRS code division multiplexing groups without mapping data is 3, and the antenna port is 1;

the value of the antenna port field is 8, the number of the DMRS code division multiplexing groups without mapping data is 3, and the number of the antenna ports is 2;

the value of the antenna port field is 9, the number of the DMRS code division multiplexing groups without mapping data is 3, and the antenna port is 3;

The value of the antenna port field is 10, the number of the DMRS code division multiplexing groups without mapping data is 3, and the antenna port is 4;

the value of the antenna port field is 11, the number of the DMRS code division multiplexing groups without mapping data is 3, and the number of the antenna ports is 5.

In this implementation, for a single port communication system, candidate antenna ports corresponding to each of at least one candidate value of the antenna port field are defined when dmrs-Type is 2 and maxLength is 1.

With reference to the first aspect to the fourth aspect, in a further possible implementation manner, the first relation further includes a number of preamble symbols corresponding to each of at least one candidate value of an antenna port field in the DCI, the dmrs-Type is 2, and the maxLength is 2;

the value of the antenna port field is 6, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 0, and the number of the preamble symbols is 1;

the value of the antenna port field is 7, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 1, and the number of the preamble symbols is 1;

the value of the antenna port field is 8, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 2, and the number of the preamble symbols is 1;

the value of the antenna port field is 9, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 3, and the number of the preamble symbols is 1;

The value of the antenna port field is 10, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 4, and the number of the preamble symbols is 1;

the value of the antenna port field is 11, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 5, and the number of the preamble symbols is 1;

the value of the antenna port field is 12, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 0, and the number of the preamble symbols is 2;

the value of the antenna port field is 13, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 1, and the number of the preamble symbols is 2;

the value of the antenna port field is 14, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 2, and the number of the preamble symbols is 2;

the value of the antenna port field is 15, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 3, and the number of the preamble symbols is 2;

the value of the antenna port field is 16, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 4, and the number of the preamble symbols is 2;

The value of the antenna port field is 17, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 5, and the number of the preamble symbols is 2;

the value of the antenna port field is 18, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 6, and the number of the preamble symbols is 2;

the value of the antenna port field is 19, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 7, and the number of the preamble symbols is 2;

the value of the antenna port field is 20, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 8, and the number of the preamble symbols is 2;

the value of the antenna port field is 21, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 9, and the number of the preamble symbols is 2;

the value of the antenna port field is 22, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 10, and the number of the preamble symbols is 2;

the value of the antenna port field is 23, the number of the DMRS code division multiplexing groups without mapping data is 3, the number of the antenna ports is 11, and the number of the preamble symbols is 2;

The value of the antenna port field is 24, the number of the DMRS code division multiplexing groups without mapping data is 1, the number of the antenna ports is 0, and the number of the preamble symbols is 2;

the value of the antenna port field is 25, the number of the DMRS code division multiplexing groups without mapping data is 1, the number of the antenna ports is 1, and the number of the preamble symbols is 2;

the value of the antenna port field is 26, the number of the DMRS code division multiplexing groups without mapping data is 1, the number of the antenna ports is 6, and the number of the preamble symbols is 2;

the value of the antenna port field is 27, the number of DMRS code division multiplexing groups of the unmapped data is 1, the number of the antenna ports is 7, and the number of the preamble symbols is 2.

In this implementation, for a single port communication system, candidate antenna ports corresponding to each of at least one candidate value of the antenna port field are defined when dmrs-Type is 2 and maxLength is 2.

In a fifth aspect, there is provided a communication system comprising a communication device according to the third aspect and a communication device according to the fourth aspect.

In a sixth aspect, there is provided a computer readable storage medium having stored thereon a computer program or instructions which, when executed by a processor, perform a method as described in any one of the first aspect, the second aspect or any implementation thereof.

A seventh aspect provides a computer program product which, when executed on a computing device, causes the method as described in any one of the first aspect, the second aspect or any one of the implementation aspects to be performed.

In an eighth aspect, there is provided a circuit coupled to a memory, the circuit being adapted to perform any one of the above first aspect, the second aspect or any one of the implementation of the method. The circuitry may include chip circuitry.

Drawings

Fig. 1 is a schematic diagram of a communication system according to the present application;

fig. 2 is a schematic diagram illustrating the meaning of an existing antenna port field according to an embodiment of the present application;

fig. 3 is a schematic diagram illustrating the meaning of another existing antenna port field according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5 is a schematic diagram of a network device allocating DMRS ports according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a simplified terminal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a simplified network device according to an embodiment of the present application;

Fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described below with reference to the accompanying drawings in the embodiments of the present application.

The technical scheme provided by the application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) system, fifth generation (5) ^th generation, 5G) communication systems (otherwise known as NR systems) and other future communication systems, e.g. sixth generation (6 ^th generation, 6G) communication systems, and the like. Optionally, the technical solution provided in the present application may also be applied to an internet of things (internet of things, ioT) system, a narrowband internet of things (narrow band internet of things, NB-IoT) system, and so on.

Fig. 1 shows a schematic diagram of a communication system according to the present application. The communication system comprises at least one network device and at least one terminal. In fig. 1, a network device and a plurality of terminals (user equipment (UE) 1 to UE5 are illustrated in the figure) constitute a communication system. In the communication system, UE1 to UE5 can communicate with a network device, where a link environment includes uplink, downlink and side-link (side-link) transmission, and information transmitted in the link includes data information actually transmitted and control information for indicating or scheduling actual data. Meanwhile, the UE3, the UE4 and the UE5 can also form a communication system, the link transmission environment is consistent with the above, and the specific information interaction depends on the configuration mode of the network.

The network device may be a device capable of communicating with a terminal. The network device may be any device having a wireless transceiving function. Including but not limited to: base stations such as node bs (nodebs), evolved base stations such as evolved node bs (enodebs), base stations in fifth generation (the fifth generation, 5G) communication systems, base stations or network equipment in future communication systems, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc. The network device may also be a wireless controller in the context of a cloud wireless access network (cloud radio access network, CRAN). The network device may also be a small station, a transmitting node (transmission reference point, TRP), etc. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

The network device may also be an access node, a wireless relay node, a wireless backhaul node, etc. in a wireless local area network (wireless fidelity, wiFi) system. The network device may also be a wireless controller in the context of a cloud wireless access network (cloud radio access network, CRAN).

For convenience of description, a base station will be taken as an example to describe a network device and the like related to the present application. In some deployments of base stations, the base stations may include Centralized Units (CUs), distributed Units (DUs), and the like. In other deployments of base stations, CUs may also be divided into CU-Control Plane (CP) and CU-User Plane (UP), etc. In other deployments of the base station, the base station may also be an open radio access network (ora) architecture, and the specific deployment manner of the base station is not limited in this application.

The terminal is equipment with a wireless receiving and transmitting function, can be deployed on land, and comprises indoor or outdoor, handheld, wearable or vehicle-mounted; the device can also be deployed on the water surface, such as a ship, etc.; but also can be deployed in the air, such as on an airplane, a balloon, a satellite, etc. The terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in an industrial control (industrial control), a wireless terminal in a self-driving (self-driving), a wireless terminal in a remote medical (remote medical), a wireless terminal in a smart grid (smart grid), a wireless terminal in a transportation security (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), or the like. The embodiments of the present application are not limited to application scenarios. A terminal device may also sometimes be referred to as a user equipment, access terminal device, UE unit, mobile station, remote terminal device, mobile device, terminal (terminal), wireless communication device, UE agent, UE apparatus, or the like.

Optionally, in the communication system shown in fig. 1, the communication between the terminals may also be performed through a device-to-device (D2D), a vehicle-to-device (V2X), or a machine-to-machine (machine to machine, M2M) technology, and the method of communication between the terminals is not limited in this application.

Illustratively, the terms "system" and "network" in embodiments of the present application may be used interchangeably.

In LTE and NR communications, a multi-user-multi-input-multi-output (MU-MIMO) technology is introduced, which is used for performing space allocation among multiple users, so as to improve spectrum efficiency. In order to support demodulation between users, the network side may allocate different DMRS for multiple paired users.

An antenna port (antenna port) field in the downlink control information (downlink control information, DCI) is used to instruct the terminal: the DMRS port number used by the scheduling of the physical downlink shared channel (physical downlink shared channel, PDSCH) is used for the downlink demodulation of the terminal; and DMRS positions that cannot be used for transmitting PDSCH Resource Elements (REs) in the present PDSCH scheduling are used for PDSCH rate matching (rate matching) by the user.

Taking DCI1_1 schedule as an example, its antenna port field length is typically 4,5 or 6 bits, and its field meaning is defined in table 7.3.1.2.2-1/2/3/4 of specification 38212. These four tables define the allocation rules of DMRS ports (s)) in the case of single/double codewords (codewiord), different antenna port types (DMRS-Type), different preamble DMRS allowed maximum time domain symbol lengths (maxLength), etc., and the number of DMRS code division multiplexing groups (Number of DMRS CDM group(s) without mapping data.

Wherein, dmrs-Type has two values. DMRS-type=1, indicating that 12 REs are supported for one symbol, and 4 DMRS ports; DMRS-type=2, indicating that one symbol, 12 REs, and 6 DMRS ports are supported.

(1) For the scenario dmrs-type=1, maxlength=1, the table shown in table 1 below is defined in 3GPP protocol 38.212:

TABLE 1

Wherein table 1 is for table 7.2.1.2.2-1 in specification 38212.

The NR system can process 2 codewords (codewird) at the same time at maximum: codeword 0 and codeword 1. A single codeword stream can be mapped to a maximum of 4 layers (i.e., 4 DMRS ports), and a double codeword stream can be mapped to a maximum of 8 layers. In this scenario, only a single codeword stream is required. Illustratively, codeword 0 is enabled (enabled) and codeword 1 is disabled (disabled).

In table 1, the antenna port field of DCI1_1 includes 4 bits, and corresponds to the value (value) of 16 antenna port fields. Wherein, the value of the antenna port field is 12-15 as the reserved bit.

DMRS-type=1, a single time domain symbol supports 4 DMRS ports: 1000 (i.e., DMRS port with DMRS port candidate value "0" in table 1), 1001 (i.e., DMRS port with DMRS port candidate value "1" in table 1), 1002 (i.e., DMRS port with DMRS port candidate value "2" in table 1), 1003 (i.e., DMRS port with DMRS port candidate value "3" in table 1).

The antenna port field has a value of "0" and is used for indicating the antenna port 1000; the antenna port field has a value of "1" for indicating the antenna port 1001; the antenna port field has a value of "2" for indicating the antenna port 1000, 1001; the antenna port field has a value of "3" for indicating the antenna port 1000; the antenna port field has a value of "4" for indicating the antenna port 1001; the antenna port field has a value of "5" for indicating the antenna port 1002; the antenna port field has a value of "6" and is used to indicate the antenna port 1003; the antenna port field has a value of "7" for indicating the antenna port 1000, 1001; the antenna port field has a value of "8" and is used for indicating the antenna ports 1002 and 1003; the antenna port field has a value of "9" for indicating the antenna ports 1000-1002; the antenna port field has a value of "10" for indicating the antenna ports 1000-1003; the antenna port field has a value of "11" for indicating the antenna port 1000, 1002.

The 4 DMRS ports may be divided into 2 code division multiplexing (code division multiplexing, CDM) groups: CDM group 0 and CDM group 1, wherein antenna ports 1000, 1001 are code division multiplexed, divided into CDM group 0; antenna ports 1002 and 1003 are code division multiplexed and divided into CDM group 1.

In table 1, when the number of DMRS code division multiplexing groups to which data is not mapped is 1, it means that there are only 1 CDM group; when the number of DMRS code division multiplexing groups to which data is not mapped is 2, it means that there are 2 CDM groups.

As shown in fig. 2, the meaning of an existing antenna port field in the embodiment of the present application is shown, and when the values of the antenna port field are "0", "1", and "2", the number of DMRS code division multiplexing groups corresponding to non-mapped data is 1, that is, corresponding to CMD group 0. DMRS transmitted on antenna port 1000 (value of antenna port field is "0"), antenna port 1001 (value of antenna port field is "1"), or antenna ports 1000, 1001 (value of antenna port field is "2") in CDM group 0 are mapped to partial REs (6 REs in the figure are illustrated) of one physical resource block (physical resource block, PRB). The remaining REs on the PRB may be used for mapping data.

When the values of the antenna port fields are "3", "4", "5", "6", "7", "8", "9", "10", "11", the number of corresponding DMRS code division multiplexing groups to which data is not mapped is 2, that is, CMD group 0 and CDM group 1 are corresponding. DMRS transmitted on an antenna port in the CDM group 0 is mapped to partial REs of one PRB (6 REs of which are illustrated in the drawing); DMRS transmitted on an antenna port in CDM group 1 is mapped to the remaining REs (the remaining 6 REs are illustrated in the figure) of the PRB. REs on the PRB may not be used for mapping data.

maxlength=1, which means that the maximum time domain symbol length allowed for different preamble DMRS is 1, i.e. DMRS is allowed to map onto at most 1 time domain symbol.

(2) For the scenario dmrs-type=1, maxlength=2, the table shown in table 2 below is defined in 3GPP protocol 38.212:

TABLE 2

Wherein table 2 is for table 7.2.1.2.2-2 in specification 38212.

Regarding the values of the antenna port fields, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength in table 2, reference may be made to the description of table 1.

Unlike table 1, in table 2, the antenna port field is 5 bits, and 32 values are possible. When the antenna ports are less than 4 ports, only a single codeword stream is required, illustratively codeword 0 is enabled and codeword 1 is not enabled; when there are more than 4 antenna ports, a dual codeword stream is required, illustratively both codeword 0 and codeword 1 are enabled.

maxlength=2, which indicates that the maximum time domain symbol length allowed for different preamble DMRS is 2, i.e., DMRS is allowed to be mapped onto a maximum of 2 time domain symbols.

Specifically, for a single codeword stream, when the value of the antenna port field is "0" to "11", the Number of preamble symbols (Number of front-load symbols) is 1, that is, DMRS is allowed to map onto 1 time domain symbol; when the antenna port field has a value of "12" to "30", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped to 2 time domain symbols.

For the dual codeword stream, when the value of the antenna port field is from "0" to "3", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped onto 2 time domain symbols.

(3) For the scenario dmrs-type=2, maxlength=1, the table shown in table 3 below is defined in 3GPP protocol 38.212:

TABLE 3 Table 3

Wherein table 3 is for table 7.2.1.2.2-3 in specification 38212.

Regarding the values of the antenna port fields in table 3, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength, reference is made to the descriptions of tables 1 and 2.

Unlike tables 1 and 2, in table 3, dmrs-type=2, and 1 time domain symbol can support 6 ports.

(4) For the scenario dmrs-type=2, maxlength=2, the table shown in table 4 below is defined in 3GPP protocol 38.212:

TABLE 4 Table 4

Wherein table 4 is for table 7.2.1.2.2-4 in specification 38212.

Regarding the values of the antenna port fields in table 4, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength, reference is made to the descriptions of tables 1 and 2.

Unlike tables 1 and 2, in table 4, dmrs-type=2, and 1 time domain symbol can support 6 ports.

Unlike tables 1 to 3, in table 4, the antenna port field is 6 bits, and 64 values are possible.

As shown in fig. 3, which is a schematic diagram of the meaning of another existing antenna port field in the embodiment of the present application, unlike table 3, maxlength=2, which indicates that the maximum allowed time domain symbol length of different preamble DMRS is 2, that is, DMRS is allowed to be mapped onto at most 2 time domain symbols. And dmrs-type=2, then 2 time domain symbols may support 12 ports.

Specifically, for a single codeword stream, when the value of the antenna port field is from "0" to "23", the number of preamble symbols is 1, i.e. DMRS is allowed to map onto 1 time domain symbol; when the antenna port field has a value of "24" to "35", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped to 2 time domain symbols.

For the dual codeword stream, when the value of the antenna port field is from "0" to "5", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped onto 2 time domain symbols.

The above existing DMRS port allocation scheme for NR has higher flexibility, but the following problems exist:

when the real port number of the system is less than the port number enumerated in the existing table, the enumerated values in the table have many invalid enumerated scenes, namely, the enumerated values which cannot occur in the system, and the information represents inefficiency.

MIMO is a key technology for performance improvement of LTE/NR, so the protocol is designed based on that the terminal will support two-receive (2 receiver,2 r)/four-receive (4 receiver,4 r)/eight-receive (8 receiver,8 r) by default. While single port communication systems, such as non-terrestrial network (non-terrestrial network, NTN) systems, are limited by channel conditions, it is difficult to satisfy the Rank2 (Rank 2) condition even for 2R, and thus it can be assumed that terminals are all single-received. Taking table 1 as an example, for a single port communication system (i.e., all terminals are single port communication systems, such as NTN systems), only the bold marked rows in table 5 below (i.e., rows 1, 2, 4, 5, 6, 7 below the header) would appear in the system, while the other rows would not be significant for a single port communication system. For the table below, if the enumerated value is 4 bits, but there are only 6 valid values. From the information table perspective, only ceil (log 2 (6))=3 bits can enumerate 6 scenarios, thus wasting 1 bit of information in DCI.

TABLE 5

As can be seen, the number of ports actually required by the single port communication system may be less than the number of ports enumerated in the existing DMRS port allocation scheme of the NR, and at this time, many enumeration values in the existing table become invalid in the enumeration scenario, which causes large signaling overhead and wastes transmission resources. The embodiment of the application provides a communication scheme, which defines a relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of a new antenna port field for a single-port communication system, and a terminal can receive a DMRS on the antenna port determined according to the relation. Compared with the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the existing antenna port field, the number of bits required by the antenna port field is reduced, so that the signaling overhead for indicating the DMRS antenna port is saved.

The specific implementation of this communication scheme is described in detail below in connection with specific embodiments:

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application. Illustratively, the method may include the steps of:

s401, the network equipment sends a first signaling.

Accordingly, the terminal receives the first signaling.

Whether for the existing DMRS port allocation table of LTE and NR or for the DMRS port allocation table of a single-port communication system, at least one candidate value of the antenna port field in the DCI (i.e., the value of the antenna port field in the table) and the candidate antenna port corresponding to each of the at least one candidate values of the antenna port field in the DCI are different according to the DMRS-Type, maxLength.

The embodiment relates to indication of a DMRS antenna port in a single-port communication system, and network equipment determines DMRS-Type and maxLength according to the condition of a terminal in an access single-port communication system. The network device then first sends a first signaling to the terminal. Wherein the first signaling includes dmrs-Type and maxLength.

Illustratively, the network device may include the dmrs-Type and maxLength in higher layer signaling, such as a radio resource control reconfiguration (rrcrecon configuration) message.

S402, the terminal determines a first relation corresponding to the single-port communication system according to the dmrs-Type and the maxLength.

In order to save DMRS antenna port indication overhead, in this embodiment, different antenna port indication relationships are used for the non-single port communication system and the single port communication system.

For non-single port communication systems, tables 1-4 are followed;

for a single port communication system, in this embodiment, a new set of DMRS port assignment tables, i.e., the first relationship, is reintroduced.

The first relation includes at least one candidate value of the antenna port field in the DCI (i.e., the value of the antenna port field in the table), and a candidate antenna port corresponding to each of the at least one candidate values of the antenna port field in the DCI. Unlike the existing table, the number of candidate antenna ports corresponding to each candidate value in the first relationship is 1.

The design of this first relationship follows the following principle: for the original table in the protocol, only the row with the port number of 1 allocated in the DMRS ports(s) column is reserved, for example, the row marked in bold in table 5 is the row with the port number of 1 allocated.

Illustratively, the following first relationship may be obtained:

(1) For the scenario dmrs-type=1, maxlength=1, a table is defined as shown in table 6 below:

TABLE 6

In this embodiment, the single port communication system processes a single codeword stream. Illustratively, in Table 6, codeword 0 is enabled and codeword 1 is not enabled.

In table 6, the antenna port field of the DCI includes 3 bits, and the values of the corresponding 8 antenna port fields (or the candidate values of the antenna port fields) are corresponding. Wherein, the value of the antenna port field is 6-7 as the reserved bit.

The antenna port field in table 6 saves 1 bit compared to table 1.

DMRS-type=1, 1 time domain symbol supports 4 DMRS ports: 1000 (i.e., DMRS port with DMRS port candidate value "0" in table 6), 1001 (i.e., DMRS port with DMRS port candidate value "1" in table 6), 1002 (i.e., DMRS port with DMRS port candidate value "2" in table 6), 1003 (i.e., DMRS port with DMRS port candidate value "3" in table 6).

The antenna port field has a value of "0" and is used for indicating the antenna port 1000; the antenna port field has a value of "1" for indicating the antenna port 1001; the antenna port field has a value of "2" for indicating the antenna port 1000; the antenna port field has a value of "3" for indicating the antenna port 1001; the antenna port field has a value of "4" for indicating the antenna port 1002; the antenna port field has a value of "5" to indicate the antenna port 1003.

The 4 DMRS ports may be divided into 2 CDM groups: CDM group 0 and CDM group 1, wherein antenna ports 1000, 1001 are code division multiplexed, divided into CDM group 0; antenna ports 1002 and 1003 are code division multiplexed and divided into CDM group 1.

In table 6, when the number of DMRS code division multiplexing groups to which data is not mapped is 1, it indicates that there are only 1 CDM group; when the number of DMRS code division multiplexing groups to which data is not mapped is 2, it means that there are 2 CDM groups.

(2) For the scenario dmrs-type=1, maxlength=2, a table is defined as shown in table 7 below:

TABLE 7

Regarding the values of the antenna port fields, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength in table 7, reference may be made to the description of table 6.

Unlike table 6, in table 7, the antenna port field is 4 bits, and 16 values are possible. The antenna port field in table 7 saves 1 bit compared to table 2.

Specifically, when the value of the antenna port field is from "0" to "5", the number of preamble symbols is 1, that is, DMRS is allowed to be mapped to 1 time domain symbol; when the antenna port field has a value of "6" to "13", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped to 2 time domain symbols.

(3) For the scenario dmrs-type=2, maxlength=1, a table is defined as shown in table 8 below:

TABLE 8

Regarding the values of the antenna port fields in table 8, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength, reference is made to the descriptions of tables 6 and 7.

In table 8, the antenna port field is 4 bits, and 16 values are possible. Compared to table 3, 1 bit is saved.

Unlike tables 6 and 7, in table 8, dmrs-type=2, and 1 time domain symbol can support 6 ports.

(4) For the scenario dmrs-type=2, maxlength=2, a table is defined as shown in table 9 below:

TABLE 9

The values of the antenna port fields, the number of DMRS code division multiplexing groups to which data is not mapped, and the meanings of the antenna ports and maxLength in table 9 can be referred to the descriptions of tables 6 and 7.

Unlike tables 6 and 7, in table 9, dmrs-type=2, and 1 time domain symbol can support 6 ports.

Unlike tables 6 to 8, in table 9, the antenna port field is 5 bits, and 32 values are possible. Compared to table 4, 1 bit is saved.

Unlike table 8, maxlength=2, indicating that the maximum time domain symbol length allowed for different preamble DMRS is 2, i.e., DMRS is allowed to map onto a maximum of 2 time domain symbols. And dmrs-type=2, then 2 time domain symbols may support 12 ports.

Specifically, when the value of the antenna port field is from "0" to "11", the number of preamble symbols is 1, that is, DMRS is allowed to be mapped to 1 time domain symbol; when the antenna port field has values of "12" to "27", the number of preamble symbols is 2, that is, DMRS is allowed to be mapped to 2 time domain symbols.

After receiving the first signaling sent by the network device, the terminal determines a first relationship corresponding to the single-port communication system according to the dmrs-Type and the maxLength, assuming that the terminal accesses the single-port communication system, i.e. any one of the first relationships in tables 6-9.

The relationships of tables 6 to 9 are not limited to MU-MIMO, and are applicable to single user scheduling.

For example, assuming that the number of hybrid automatic repeat request (hybrid automatic repeat request, HARQ) channels is extended from 16 to 32 to support the large latency of the NTN system, the corresponding HARQ process number (HARQ process number) field may be extended from 4 bits to 5 bits, the 1 bit saved in the DCI for indicating the DMRS antenna port may be used for extension of the HARQ channel number without increasing the length of the DCI.

S403, the network device transmits DCI.

Accordingly, the terminal receives the DCI.

In the PDSCH resource allocation process, the network device allocates DMRS antenna port numbers for demodulating PDSCH to the terminal. The network device may also calculate DMRS puncturing positions corresponding to the scheduled positions of the terminal in the present time slot, where the DMRS puncturing positions cannot be used for transmitting PDSCH, i.e. the number of DMRS code division multiplexing groups to which data is not mapped.

As shown in fig. 5, a schematic diagram of allocating DMRS ports to a network device according to an example of the present application is shown, where the network device allocates DMRS port 0 to ue_a, allocates DMRS port 1 to ue_b, allocates DMRS port 2 to ue_c, and can allocate 3 DMRS ports only when the number of DMRS code division multiplexing groups to which data is not mapped is 2, so that the number of DMRS code division multiplexing groups to which data is not mapped is set to be 2. For example, if DMRS port 0 and DMRS port 1 are divided into CDM group 0, DMRS port 2 and DMRS port 3 are divided into CDM group 1, ue_a and ue_b are code division multiplexed, and ue_c is frequency division multiplexed with ue_ A, UE _b. The number of DMRS code division multiplexing groups to which data is not mapped is 2, and data cannot be mapped at the time domain positions where ue_ A, UE _b and ue_c are mapped.

The terminal accesses to the single port communication system, the network device determines, according to the DMRS-Type and maxLength, a first relation in one of tables 6 to 9 described above, and determines the value of the antenna port field according to the DMRS port number allocated to the terminal and the number of DMRS code division multiplexing groups to which data is not mapped, which are determined by the network device. The antenna port field is used to indicate one of at least one candidate value of the antenna port field in the DCI.

The network device then transmits DCI carried on a physical downlink control channel (physical downlink control channel, PDCCH). The DCI includes the antenna port field described above.

Still referring to the example of fig. 5, assuming DMRS-type=1 and maxlength=1, referring to the first relationship shown in table 6, for ue_a, the number of DMRS code division multiplexing groups to which data is not mapped is found to be 2, and the DMRS port is a row of 0, the value of the antenna port field is 2; for UE_B, searching the row with the number of DMRS code division multiplexing groups not mapping data being 2 and the DMRS port being 1, and taking the value of an antenna port field as 3; for ue_c, the number of DMRS code division multiplexing groups to which data is not mapped is found to be 2, and the DMRS port is a row of 2, and the value of the antenna port field is 4.

In this embodiment, taking the terminal as the ue_a as an example, the network device sends DCI, where the value of the antenna port field in the DCI is 2 (in binary representation, 010).

S404, the terminal determines an antenna port corresponding to the indicated one value according to the indicated one value.

After detecting DCI carried in PDCCH, the terminal analyzes and acquires the value of an antenna port field.

The terminal determines, according to the values of dmrs-Type and maxLength carried in the first signaling, a first relation in one of tables 6 to 9 as described above, and determines, according to one value indicated by an antenna port field carried in DCI, an antenna port corresponding to the indicated one value, that is, determines a row corresponding to the table.

Still referring to the example of fig. 5, assuming that the terminal is ue_a, assuming that DMRS-type=1 and maxlength=1, referring to the first relationship shown in table 6, the number of DMRS code division multiplexing groups to which data is not mapped may be determined to be 2 and the DMRS antenna port to be 0 by looking up a row with a value of 2 in table 6;

assuming that the terminal is ue_b, assuming that DMRS-type=1 and maxlength=1, referring to a first relationship shown in table 6, a row with a value of 3 in the lookup table 6 can determine that the number of DMRS code division multiplexing groups without mapping data is 2 and the DMRS antenna port is 1;

assuming that the terminal is ue_c, assuming that DMRS-type=1 and maxlength=1, referring to the first relationship shown in table 6, a row with a value of 4 in the lookup table 6 can determine that the number of DMRS code division multiplexing groups to which data is not mapped is 2 and the DMRS antenna port is 2.

And S405, the network equipment transmits the DMRS on the determined antenna port.

Accordingly, the terminal receives the DMRS on the determined antenna port.

After the network device and the terminal determine the antenna port of the DMRS, the network device sends the DMRS on the determined antenna port, and the terminal receives the DMRS on the determined antenna port. The DMRS on the antenna port is used for demodulating data on the antenna port.

Further, this embodiment may further include the following steps (this step is optional, and is shown in dotted lines):

s406, the terminal determines the number of the DMRS code division multiplexing groups which are not mapped with data and correspond to the indicated value according to the first relation.

The terminal determines, according to the DMRS-Type and maxLength values carried in the first signaling, a first relation in one of tables 6 to 9 described above, and according to one value indicated by an antenna port field carried in DCI, may determine, in addition to an antenna port corresponding to the indicated one value, the number of DMRS code division multiplexing groups of unmapped data corresponding to the indicated one value.

S407, the terminal determines the time-frequency domain position of the data on the antenna port according to the determined number of the DMRS code division multiplexing groups without mapping the data.

And the terminal can determine whether the data is mapped on the antenna port and the time-frequency domain position of the data on the antenna port according to the determined number of the DMRS code division multiplexing groups without the data.

As shown in table 6, when the value of the antenna port is "0" or "1", the number of DMRS code division multiplexing groups not mapping data is 1, the pattern (pattern) mapped by the DMRS can be determined according to the number of DMRS code division multiplexing groups not mapping data, and it is determined that the DMRS is mapped with data on the time domain position, and the time-frequency domain position of the data can be determined.

As shown in table 6, when the antenna ports have values of "2" to "5", the number of DMRS code division multiplexing groups to which data is not mapped is 2, and it can be determined that there is no mapped data at the time domain position where the DMRS is located.

And S408, the network equipment transmits data at the determined time-frequency domain position.

Accordingly, the terminal receives data at the determined time-frequency domain location.

The network device and the terminal determine whether data is mapped on the time domain position where the DMRS is located, and after determining the time-frequency domain position of the data, the network device and the terminal can transmit the data on the determined time-frequency domain position.

According to the communication method provided by the embodiment of the application, for a single-port communication system, a relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of a new antenna port field is defined, and a terminal can receive the DMRS on the antenna ports determined according to the relation. Compared with the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the existing antenna port field, the number of bits required by the antenna port field is reduced, so that the signaling overhead for indicating the DMRS antenna port is saved.

It will be appreciated that, in order to implement the functions in the above embodiments, the terminal and the network device include corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application scenario and design constraints imposed on the solution.

Fig. 6-9 are schematic structural diagrams of possible communication devices according to embodiments of the present application. These communication devices may be used to implement the functions of the terminal or the network device in the above method embodiments, so that the beneficial effects of the above method embodiments may also be implemented.

As shown in fig. 6, a schematic structural diagram of a communication device according to an embodiment of the present application is provided, where the communication device 600 includes a transceiver unit 601 and a processing unit 602.

When the communication device is used to implement the functions of the terminal in the embodiment shown in fig. 4, the transceiver 601 is used to execute the functions executed by the terminal in steps S401, S403, S405 and S408 in the embodiment shown in fig. 4; the processing unit 602 is configured to perform steps S402, S404, S406, and S407 of the embodiment shown in fig. 4.

When the communication apparatus is used to implement the functions of the network device in the embodiment shown in fig. 4, the transceiver unit 601 is used to perform the functions performed by the network device in steps S401, S403, S405, and S408 in the embodiment shown in fig. 4.

According to the communication device provided by the embodiment of the application, for the single-port communication system, the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the new antenna port field is defined, and the terminal can receive the DMRS on the antenna ports determined according to the relation. Compared with the relation of candidate antenna ports corresponding to each candidate value in at least one candidate value of the existing antenna port field, the number of bits required by the antenna port field is reduced, so that the signaling overhead for indicating the DMRS antenna port is saved.

Fig. 7 shows a simplified schematic structure of a terminal. For ease of understanding and ease of illustration, in fig. 7, the terminal is exemplified by a cell phone. As shown in fig. 7, the terminal includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal, executing software programs, processing data of the software programs and the like. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. For example, some kinds of terminals may not have input-output devices.

When data is transmitted, the processor carries out baseband processing on the data to be transmitted and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 7. In an actual end product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, which is not limited by the embodiments of the present application.

In the embodiment of the present application, the antenna and the radio frequency circuit with the transceiver function may be regarded as a receiving unit and a transmitting unit (may also be collectively referred to as a transceiver unit) of the terminal, and the processor with the processing function may be regarded as a processing unit of the terminal. As shown in fig. 7, the terminal includes a transceiving unit 701 and a processing unit 702. The transceiver unit 701 may also be referred to as a receiver/transmitter (transmitter), a receiver/transmitter circuit, or the like. The processing unit 702 may also be referred to as a processor, processing board, processing module, processing device, etc. The transceiver unit 701 is configured to implement the function of the transceiver unit 601 in the embodiment shown in fig. 6; the processing unit 702 is configured to implement the functions of the processing unit 602 in the embodiment shown in fig. 6.

For example, in one embodiment, the transceiver unit 701 is configured to perform the functions performed by the terminal in steps S401, S403, S405, and S408 in the embodiment shown in fig. 4; the processing unit 702 is configured to perform steps S402, S404, S406, and S407 of the embodiment shown in fig. 4.

Fig. 8 shows a simplified schematic diagram of the architecture of a network device. The network device includes a radio frequency signal transceiving and converting part and an 802 part, and the radio frequency signal transceiving and converting part further includes a transceiving unit 801 part. The radio frequency signal receiving and transmitting and converting part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals; the 802 portion is mainly used for baseband processing, control of network devices, and the like. The transceiving unit 801 may also be referred to as a reception/transmission (transmitter), a reception/transmitter, a reception/transmission circuit, or the like. Portion 802 is typically a control center of the network device, and may be generally referred to as a processing unit, for controlling the network device to perform the steps performed in fig. 4 described above with respect to the network device. See for details the description of the relevant parts above. The transceiver unit 801 may be used to implement the functionality of the transceiver unit 601 in the embodiment shown in fig. 6, and the portion 802 is used to implement the functionality of the processing unit 602 in the embodiment shown in fig. 6.

The 802 portion may include one or more boards, each of which may include one or more processors and one or more memories, the processors being configured to read and execute programs in the memories to implement baseband processing functions and control of the network device. If there are multiple boards, the boards can be interconnected to increase processing power. As an alternative implementation manner, the multiple boards may share one or more processors, or the multiple boards may share one or more memories, or the multiple boards may share one or more processors at the same time.

For example, in one embodiment, the transceiver unit 801 is configured to perform the functions performed by the network device in steps S401, S403, S405, and S408 in the embodiment shown in fig. 4.

As shown in fig. 9, a communication device 900 is a schematic structural diagram of another communication device according to an embodiment of the present application, and includes a processor 901 and an interface circuit 902. The processor 901 and the interface circuit 902 are coupled to each other. It is understood that the interface circuit 902 may be a transceiver or an input-output interface. Optionally, the communication device 900 may further include a memory 903 for storing instructions executed by the processor 901 or for storing input data of instructions executed by the processor 901 or data generated after the instructions executed by the processor 901.

When the communication device 900 is used to implement the method shown in fig. 4, the processor 901 is used to implement the functions of the processing unit 602, and the interface circuit 902 is used to implement the functions of the transceiver unit 601.

When the communication device is a chip applied to the terminal, the chip is used for realizing the functions of the terminal in the method embodiment. The chip receives information from other modules (such as radio frequency modules or antennas) in the terminal, the information being sent to the terminal by the network device or other devices; alternatively, the chip sends information to other modules in the terminal (e.g., radio frequency modules or antennas) that the terminal sends to the network device or other devices.

When the communication device is a chip applied to the network device, the chip is used for realizing the functions of the network device in the method embodiment. The chip receives information from other modules (such as radio frequency modules or antennas) in the network device, and the information is sent to the network device by the terminal or other devices; alternatively, the chip sends information to other modules in the network device (e.g., radio frequency modules or antennas) that the network device sends to the terminal or other device.

It is to be appreciated that the processor in embodiments of the present application may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by a processor executing software instructions. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, hard disk, removable disk, compact disk-read only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a first node. The processor and the storage medium may reside as discrete components in a terminal.

The embodiment of the application also provides a communication system which comprises the communication device.

The present application also provides a computer-readable storage medium having stored thereon a computer program or instructions which, when executed by a processor, cause the method described in the above embodiments to be performed.

The present application also provides a computer program product which, when executed on a computing device, causes the method described in the above embodiments to be performed.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a terminal, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs; but also semiconductor media such as solid state disks.

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/", generally indicates that the associated object is an or relationship; in the formulas of the present application, the character "/" indicates that the front and rear associated objects are a "division" relationship.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.

Claims

1. A communication method applied to a terminal in a single port communication system, the method comprising:

receiving a first signaling, wherein the first signaling comprises a Type DMRS-Type of a demodulation reference signal (DMRS) and a maximum time domain symbol length maxLength allowed by a pre-DMRS;

determining a first relation corresponding to the single-port communication system according to the dmrs-Type and the maxLength, wherein the first relation comprises at least one candidate value of an antenna port field in Downlink Control Information (DCI) and candidate antenna ports corresponding to each candidate value in at least one candidate value of the antenna port field in the DCI, and the number of the candidate antenna ports corresponding to each candidate value in the first relation is 1;

receiving the DCI, the DCI including the antenna port field, the antenna port field being used to indicate one of at least one candidate value of the antenna port field in the DCI;

determining an antenna port corresponding to the indicated one value according to the indicated one value;

and receiving the DMRS on the determined antenna port.

2. The method of claim 1, wherein the first relationship further comprises a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI;

The method further comprises the steps of:

determining the number of DMRS code division multiplexing groups of non-mapped data corresponding to one value of the indication according to the first relation;

determining the time-frequency domain position of the data on the determined antenna port according to the determined number of the DMRS code division multiplexing groups without mapping the data;

and receiving the data at the determined time-frequency domain position.

3. A communication method applied to a network device in a single port communication system, the method comprising:

transmitting a first signaling, wherein the first signaling comprises a Type DMRS-Type of a demodulation reference signal (DMRS) and a maximum time domain symbol length maxLength allowed by a pre-DMRS;

transmitting the DCI, the DCI including the antenna port field, the antenna port field being used to indicate one of at least one candidate value of the antenna port field in the DCI;

and transmitting the DMRS on the determined antenna port.

4. The method of claim 3, wherein the first relationship further includes a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI;

the method further comprises the steps of:

and transmitting the data at the determined time-frequency domain position.

5. The method of claim 2 or 4, wherein the DMRS on the antenna port is used to demodulate data on the antenna port.

6. A communication device, the communication device comprising: a transceiver unit and a processing unit; wherein:

the receiving and transmitting unit is configured to receive a first signaling, where the first signaling includes a Type DMRS-Type of a demodulation reference signal DMRS and a maximum time domain symbol length maxLength allowed by a preamble DMRS;

The processing unit is configured to determine a first relationship corresponding to the single port communication system according to the dmrs-Type and the maxLength, where the first relationship includes at least one candidate value of an antenna port field in downlink control information DCI and a candidate antenna port corresponding to each candidate value of at least one candidate value of the antenna port field in the DCI, and the number of candidate antenna ports corresponding to each candidate value in the first relationship is 1;

the transceiver unit is further configured to receive the DCI, where the DCI includes an antenna port field, where the antenna port field is configured to indicate one value of at least one candidate value of the antenna port field in the DCI;

the processing unit is further configured to determine an antenna port corresponding to the indicated one value according to the indicated one value;

the transceiver unit is further configured to receive a DMRS on the determined antenna port.

7. The communications apparatus of claim 6, wherein the first relationship further comprises a number of non-mapped DMRS code division multiplexing groups corresponding to each of at least one candidate value of an antenna port field in the DCI;

The processing unit is further configured to determine, according to the first relationship, a number of DMRS code division multiplexing groups of unmapped data corresponding to one value of the indication;

the processing unit is further configured to determine a time-frequency domain position of the data on the antenna port according to the determined number of DMRS code division multiplexing groups that do not map the data;

the receiving and transmitting unit is further configured to receive the data at the determined time-frequency domain position.

8. A communication device, the communication device comprising: a transceiver unit and a processing unit; wherein:

the receiving and transmitting unit is configured to send a first signaling, where the first signaling includes a Type DMRS-Type of a demodulation reference signal DMRS and a maximum time domain symbol length maxLength allowed by a preamble DMRS;

The transceiver unit is further configured to send the DCI, where the DCI includes an antenna port field, where the antenna port field is configured to indicate one value of at least one candidate value of the antenna port field in the DCI;

the transceiver unit is further configured to send a DMRS on the determined antenna port.

9. The communications apparatus of claim 8, wherein the first relationship further comprises a number of DMRS code division multiplexing groups of unmapped data corresponding to each of at least one candidate value of an antenna port field in the DCI;

the receiving and transmitting unit is further configured to transmit the data at the determined time-frequency domain position.

10. The communication apparatus according to claim 7 or 9, wherein the DMRS on the antenna port is used to demodulate data on the antenna port.

11. The method of claim 2, 4 or 5, or the device of claim 7, 9 or 10, wherein the dmrs-Type is 1 and the maxLength is 1;

12. The method of claim 2, 4 or 5, or the apparatus of claim 7, 9 or 10, wherein the first relationship further comprises a number of preamble symbols corresponding to each of at least one candidate value of an antenna port field in the DCI, the dmrs-Type is 1, and the maxLength is 2;

13. The method of claim 2, 4 or 5, or the apparatus of claim 7, 9 or 10, wherein the dmrs-Type is 2 and the maxLength is 1;

14. The method of claim 2, 4 or 5, or the apparatus of claim 7, 9 or 10, wherein the first relationship further comprises a number of preamble symbols corresponding to each of at least one candidate value of an antenna port field in the DCI, the dmrs-Type is 2, and the maxLength is 2;

15. A communication device, comprising: a processor for executing a program stored in a memory, which when executed causes the apparatus to perform the method of any one of claims 1-5, 11-14.

16. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method according to any of claims 1-5, 11-14.