CN115968050A

CN115968050A - Method, device and terminal for determining quasi co-location downlink RS

Info

Publication number: CN115968050A
Application number: CN202111173172.5A
Authority: CN
Inventors: 吴凯; 王理惠
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2023-04-14
Also published as: WO2023056929A1

Abstract

The application discloses a method, a device and a terminal for determining a quasi co-located downlink RS, which belong to the technical field of communication, and the method for determining the quasi co-located downlink RS comprises the following steps: under the condition that a terminal carries out physical random access channel PRACH repeated transmission, the terminal determines a target downlink RS of a QCL (quasi co-location with an antenna port of a demodulation reference signal DMRS) of a target downlink channel; wherein the target downlink channel comprises at least one of the following channels: a physical downlink control channel, PDCCH, for scheduling random access responses, RARs; a physical downlink shared channel, PDSCH, for transmitting the RAR; a PDCCH for scheduling the Msg3 retransmission; a PDSCH for transmitting contention resolution information; a PDCCH for scheduling contention resolution information; a PDCCH for the terminal to monitor in a control resource set, CORESET # 0.

Description

Method, device and terminal for determining quasi co-location downlink RS

Technical Field

The present application belongs to the field of communications technologies, and in particular, to a method, an apparatus, and a terminal for determining a Reference Signal (RS).

Background

In the competitive random access process, different terminals randomly select a preamble (preamble) for transmission, and when the different terminals select the same preamble on the same resource to transmit, the competitive random access process is triggered. If the contention resolution is unsuccessful, the terminal reselects a Random Access Channel (RACH) transmission resource, performs Physical RACH (PRACH) transmission, and performs the next Random Access attempt.

In the related art, after the PRACH is transmitted, the terminal performs Random Access Response (RAR) (Msg 2) and a Physical Downlink Control Channel (PDCCH) for scheduling RAR, and schedules reception of PDCCH and Msg4 (including a Physical Downlink Shared Channel (PDSCH) and PDCCH for scheduling PDSCH) for retransmission of Msg3, and it is assumed that an antenna port for a Demodulation Reference Signal (DMRS) and a Synchronization Signal/Physical broadcast Channel block (SSB) for transmitting PRACH or a Channel State Information Reference Signal (pbcs) are Quasi-co-location (QCL).

However, if the terminal performs repeated transmission of the PRACH, considering that SSBs associated with random access channel opportunities (RACH interference, RO) used by the repeatedly transmitted PRACH may be different and transmission beams corresponding to different SSBs are also different, the terminal needs to determine a downlink reception beam in a plurality of SSBs after transmitting the PRACH, and therefore how to determine a downlink channel RAR (Msg 2) and a PDCCH for scheduling the RAR, schedule a PDCCH for retransmission by Msg3, and determine an SSB referred to by Msg4 (including the PDSCH and the PDCCH for scheduling the PDSCH) are urgent problems to be solved.

Disclosure of Invention

The embodiment of the application provides a method, a device and a terminal for determining a quasi-co-located downlink RS, which can determine a target downlink RS quasi-co-located with an antenna port of a DMRS (demodulation reference signal) of a target downlink channel under the condition of PRACH (physical random access channel) repeated transmission.

In a first aspect, a method for determining a quasi-co-located downlink RS is provided, which is applied to a terminal, and includes:

under the condition that a terminal carries out physical random access channel PRACH repeated transmission, the terminal determines a target downlink RS of a QCL (quasi co-location with an antenna port of a demodulation reference signal DMRS) of a target downlink channel; wherein the target downlink channel comprises at least one of the following channels:

a physical downlink control channel, PDCCH, for scheduling random access responses, RARs;

a physical downlink shared channel, PDSCH, for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

and the PDCCH is used for monitoring in a control resource set CORESET #0 by the terminal.

In a second aspect, a device for determining a quasi co-located downlink RS is provided, including:

the device comprises a determining module, a transmitting module and a receiving module, wherein the determining module is used for determining a target downlink RS of a QCL (quasi co-location with an antenna port of a demodulation reference signal DMRS) of a target downlink channel under the condition that a terminal carries out physical random access channel PRACH (physical random access channel) repeated transmission; wherein the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting the RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

a PDCCH for the terminal to monitor in a control resource set, CORESET # 0.

In a third aspect, a terminal is provided, the terminal comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method according to the first aspect.

In a fourth aspect, a terminal is provided, which includes a processor and a communication interface, where the processor is configured to: under the condition that a terminal carries out physical random access channel PRACH repeated transmission, determining a target downlink RS of a QCL (quasi co-location with an antenna port of a demodulation reference signal DMRS) of a target downlink channel; wherein, the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

In a fifth aspect, there is provided a readable storage medium on which a program or instructions are stored, which program or instructions, when executed by a processor, implement the steps of the method according to the first aspect.

In a sixth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instructions to implement the method according to the first aspect.

In a seventh aspect, there is provided a computer program/program product stored in a non-transitory storage medium, the program/program product being executed by at least one processor to implement the steps of the method for determining a quasi co-located downlink RS according to the first aspect.

In the embodiment of the application, under the condition of repeated transmission of the PRACH, the terminal determines the target downlink RS which is quasi co-located with the antenna port of the DMRS of the target downlink channel, so that the terminal only needs to monitor the target downlink channel which is quasi co-located with the target downlink RS, monitoring resources can be saved, and random access efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system to which an embodiment of the present application is applicable;

fig. 2 is a schematic flowchart of a method for determining a quasi co-located downlink RS according to an embodiment of the present application;

fig. 3 is a second flowchart of a method for determining quasi-co-located downlink RS according to an embodiment of the present application;

FIG. 4 is a diagram illustrating an ascending order of SSB index values provided by an embodiment of the present application;

fig. 5 is a schematic diagram of the number of PRACH retransmissions provided in the embodiment of the present application;

fig. 6 is a schematic diagram of an RAR PDCCH MO in an RAR window according to a time sequence according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a device for determining a quasi-co-located downlink RS according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

fig. 9 is a second schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE)/LTE-Advanced (LTE-a) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (Frequency Division Multiple Access)Multiple Access, FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described techniques can be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for purposes of example, and NR terminology is used in much of the description below, but the techniques may also be applied to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 is a schematic structural diagram of a wireless communication system to which an embodiment of the present application is applicable. As shown in fig. 1, the wireless communication system includes a terminal 11 and a network-side device 12. Wherein, the terminal 11 may also be called a terminal Device or a User Equipment (UE), the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palmtop Computer, a netbook, a super-Mobile Personal Computer (UMPC), a Mobile Internet Device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (Wearable Device), a vehicle mounted Device (VUE), a pedestrian terminal (PUE), a smart home (a Device with wireless communication function, such as a refrigerator, a television, a washing machine or furniture), and the like, and the Wearable Device includes: smart watch, smart bracelet, smart earphone, smart glasses, smart jewelry (smart bracelet, smart ring, smart necklace, smart anklet, etc.), smart wristband, smart garment, game console, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network-side device 12 may be a Base Station or a core network, where the Base Station may be referred to as a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a WLAN access Point, a WiFi node, a Transmit Receiving Point (TRP), or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but a specific type of the Base Station is not limited.

The method for determining the quasi-co-located downlink RS provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings through some embodiments and application scenarios thereof.

The embodiment of the application provides a method for determining a quasi-co-location downlink RS, wherein a terminal determines a target downlink RS quasi-co-located with an antenna port of a DMRS (demodulation reference signal) of a target downlink channel under the condition of PRACH (physical random access channel) repeated transmission, so that the terminal only needs to monitor the target downlink channel quasi-co-located with the target downlink RS, monitoring resources can be saved, and random access efficiency is improved.

Fig. 2 is a schematic flowchart of a method for determining a quasi-co-located downlink RS according to an embodiment of the present application, where the method is applied to a terminal, and as shown in fig. 2, the method includes the following steps:

step 201, under the condition that a terminal carries out PRACH repeated transmission, the terminal determines a target downlink RS which is quasi-co-located with an antenna port of a DMRS of a target downlink channel; wherein the target downlink channel comprises at least one of the following channels:

a PDCCH for scheduling RAR;

a PDSCH for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

PDCCH for the terminal to monitor in a Control Resource set (core) # 0.

Optionally, the embodiments of the present application may be applied to a PRACH repeated transmission scenario, and the terminal may include, but is not limited to, the types of the terminal 11 listed above. The target downlink RS comprises at least one of the following: SSB, CSI-RS. In NR, PDSCH transmitting contention resolution information is also referred to as Msg4; the PDCCH of the scheduling contention resolution information (i.e., msg 4) is a PDCCH scrambled by a Temporary Cell Radio Network Temporary Identifier (TC-RNTI).

Optionally, the quasi co-location attribute may include: doppler shift (Doppler shift), doppler spread (Doppler spread), average delay (average delay), delay spread (delay spread), spatial RX parameters (spatial RX parameters).

According to the method for determining the quasi-co-location downlink RS, the terminal determines the target downlink RS which is quasi-co-located with the antenna port of the DMRS of the target downlink channel under the condition of PRACH repeated transmission, so that the terminal only needs to monitor the target downlink channel which is quasi-co-located with the target downlink RS, monitoring resources can be saved, and random access efficiency is improved.

Optionally, an implementation manner of the terminal determining the target downlink RS quasi co-located with the antenna port of the DMRS of the target downlink channel may include at least one of the following manners:

mode 1, when the target downlink channel includes the PDCCH for scheduling the RAR, the terminal determines, based on target information, a target downlink RS quasi co-located with an antenna port of a DMRS of the PDCCH for scheduling the RAR; wherein the target information comprises at least one of the following information:

time domain position of Monitoring Opportunity (MO) of PDCCH;

at least one downlink SSB;

at least one downlink CSI-RS;

and the terminal sends at least one downlink RS associated with the target RO of the PRACH preamble.

Optionally, the at least one downlink SSB may include at least one of: all SSBs sent by the serving cell of the terminal; and the terminal repeatedly sends at least one SSB associated with the PRACH.

Optionally, the at least one downlink CSI-RS may include at least one of: all CSI-RSs associated with random access resources used by the terminal; and the terminal repeatedly transmits at least one CSI-RS associated with the PRACH.

Optionally, the determining, by the terminal, based on the target information, an implementation manner of the target downlink RS that is quasi-co-located with the antenna port of the DMRS of the PDCCH for scheduling the RAR may include: under the condition that the target information comprises the time domain position of the monitoring occasion of the PDCCH, the terminal respectively determines target downlink RSs quasi-co-located with antenna ports of the DMRS of at least one PDCCH on the basis of downlink RSs associated with at least one PRACH corresponding to the time domain position of the monitoring occasion of the at least one PDCCH in a RAR window (window); wherein, the time sequence of the time domain position of the monitoring interference of the at least one PDCCH corresponds to the index of the downlink RS associated with the at least one PRACH in an ascending order. That is, in the RAR window, a plurality of monitoring instances of the PDCCH scheduling the RAR correspond to the index of the at least one downlink RS in time order one to one as described above. Optionally, the time sequence refers to a front-back sequence of time; when the terminal monitors on the monitoring occasion of the first PDCCH, the antenna port of the DMRS of the first PDCCH and the downlink SSB and/or the downlink CSI-RS associated with at least one PRACH corresponding to the time domain position of the monitoring occasion of the first PDCCH are quasi co-located.

Optionally, the sending, by the terminal, of the at least one downlink RS associated with the target RO of the PRACH preamble may include at least one of the following:

1) The terminal performs at least one downlink RS associated with a first RO or a last RO in a plurality of ROs repeatedly transmitted by the PRACH;

2) At least one downlink RS associated with one RO in a plurality of ROs repeatedly transmitted by the terminal indicated by the network side equipment; for example, the network side device indicates through a System Information Block (SIB);

3) The terminal carries out the first x downlink RSs or the last x downlink RSs associated with a plurality of RO which are repeatedly transmitted by the PRACH; wherein x is greater than or equal to 1; the actual value of x may be predefined by a protocol or configured by the network side device, for example, the network side device indicates the actual value of x through an SIB.

And 2, the terminal determines a target downlink RS quasi-co-located with an antenna port of the DMRS of the target downlink channel based on the detected downlink RS quasi-co-located with the PDCCH for scheduling RAR. For example, when the terminal detects the PDCCH for scheduling the RAR, the terminal determines, based on a downlink RS quasi co-located with the detected PDCCH for scheduling the RAR, a target downlink RS quasi co-located with an antenna port of the DMRS of the target downlink channel (e.g., a PDSCH for transmitting the RAR; a PDCCH for scheduling Msg3 retransmission; a PDSCH for transmitting contention resolution information; a PDCCH for scheduling the contention resolution information; and a PDCCH for the terminal to monitor in CORESET # 0).

Mode 3, the terminal acquires a downlink RS indicated by the network side equipment in the PDCCH for scheduling RAR or the PDSCH for transmitting RAR; and the terminal determines a target downlink RS quasi-co-located with an antenna port of the DMRS of the target downlink channel based on the downlink RS indicated by the acquired network side equipment in the PDCCH for scheduling RAR or the PDSCH for transmitting RAR.

And 4, under the condition that the target downlink channel comprises the PDCCH used for the terminal to monitor in the CORESET #0, the terminal determines a target downlink RS quasi-co-located with the antenna port of the DMRS used for the PDCCH monitored by the terminal in the CORESET #0 based on the received downlink RS indicated in the Msg4 sent by the network side equipment. Optionally, before the terminal determines a target downlink RS quasi co-located with the antenna port of the DMRS for the PDCCH monitored by the terminal in the CORESET #0 based on the received downlink RS indicated in the Msg4 sent by the network side device, the terminal sends Msg3 to the network side device; the Msg3 carries at least one channel state information CSI of a downlink RS. Optionally, the CSI includes at least one of: reference Signal Received Power (RSRP), signal to Interference Noise Ratio (SINR), channel Quality Indicator (CQI).

Fig. 3 is a second flowchart of a method for determining a quasi-co-located downlink RS according to an embodiment of the present application, where the method is applied to a terminal, and as shown in fig. 3, the method includes the following steps:

step 301, under the condition that a terminal performs PRACH repeated transmission, the terminal determines a target downlink RS which is quasi co-located with an antenna port of a DMRS of a target downlink channel; wherein the target downlink channel comprises at least one of the following channels:

a PDCCH for scheduling RAR;

a PDSCH for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

for the PDCCH the terminal monitors in CORESET # 0.

And 302, the terminal monitors a target downlink channel quasi co-located with the target downlink RS based on the target downlink RS.

According to the method for determining the quasi-co-location downlink RS, under the condition that PRACH repeated transmission is carried out and SSBs associated with ROs used for PRACH transmission at each time are not identical, the terminal determines the target downlink RS quasi-co-located with the antenna port of the DMRS of the target downlink channel from the associated SSBs, so that the terminal only needs to monitor the target downlink channel quasi-co-located with the target downlink RS, channel monitoring resources can be saved, and random access efficiency is improved.

The following describes a method for determining a quasi-co-located downlink RS according to an embodiment of the present application, by taking an example in which a terminal determines downlink RSs of QCLs of different monitoring sessions in an RAR window.

After the terminal performs the PRACH transmission, an RAR window is opened, and the terminal monitors a Random Access Response (RAR) in the window. Multiple monitoring occasations may be included in the window.

Under the condition that the terminal performs PRACH retransmission, the UE uses different QCL hypotheses when monitoring in multiple PDCCH monitoring sessions in the window, that is, the DMRSs of the PDCCHs and different downlink RSs (including SSBs and/or CSI-RSs) are considered to be quasi co-located. The SSB and/or CSI-RS comprise at least one of the following:

1) The SSBs are all SSBs sent by a service cell of the terminal, and the information is indicated by a network;

2) The CSI-RS is all CSI-RSs which are configured by network side equipment and are related to random access resources used by the terminal;

3) The SSB is at least one SSB related to the PRACH repeatedly sent by the terminal;

4) The CSI-RS is at least one CSI-RS associated with the PRACH repeatedly sent by the terminal.

In the window, the time sequence of the PDCCH monitoring event corresponds to the indexes of the plurality of downlink RSs one by one in an ascending order, and the DMRS monitored by the PDCCH and the corresponding downlink RSs are quasi co-located. The correspondence relationship can be described by the following figures. Fig. 4 is a schematic diagram of an ascending order of SSB index values provided in the embodiment of the present application, fig. 5 is a schematic diagram of times of PRACH retransmission provided in the embodiment of the present application, and fig. 6 is a schematic diagram of RAR PDCCH MOs in an RAR window provided in the embodiment of the present application in a time sequence; referring to fig. 4-6, the terminal performs 4 PRACH repeated transmissions (the first transmission, the second transmission, the third transmission, and the fourth transmission, respectively), performs the repeated transmissions on at least 4 ROs associated with 4 SSBs (the first SSB, the second SSB, the third SSB, and the fourth SSB, respectively), and within a window for monitoring an RAR, the monitoring instances of the RAR PDCCH (the first RAR PDCCH MO, the second RAR PDCCH MO, the third RAR PDCCH MO, and the fourth RAR PDCCH MO, respectively) correspond to the SSB index values in a time-sequential manner, and the DMRS on the PDCCH and the SSBs corresponding to the index values are quasi-co-located, that is: the DMRS and the first SSB of the PDCCH corresponding to the first RAR PDCCH MO are quasi co-located, the DMRS and the second SSB of the PDCCH corresponding to the second RAR PDCCH MO are quasi co-located, the DMRS and the third SSB of the PDCCH corresponding to the third RAR PDCCH MO are quasi co-located, and the DMRS and the fourth SSB of the PDCCH corresponding to the fourth RAR PDCCH MO are quasi co-located.

The method for determining the quasi-co-located downlink RS provided in this embodiment of the present application is described below, taking as an example that a terminal determines, according to a detected downlink RS quasi-co-located with a PDCCH for scheduling an RAR, a downlink RS of a QCL of another downlink channel in a random access process.

And the terminal monitors the PDCCH of the scheduling RAR according to the corresponding quasi-co-located downlink RS in a plurality of different PDCCH monitoring scenarios in the RAR window.

The network side device may send only one RAR in the RAR window, that is, the terminal detects only an RAR PDCCH quasi co-located with a certain downlink RS. Then, the terminal may use the downlink RS corresponding to the monitoring interference detected RAR as the quasi-co-located downlink RS of the following downlink channels.

b) A PDSCH for transmitting RAR (Msg 2);

c) A PDCCH for scheduling the Msg3 retransmission;

d) A PDCCH for scheduling contention resolution information;

e) A PDSCH (i.e., msg4 PDSCH) for transmitting contention resolution information;

f) And the PDCCH is used for the terminal to monitor in CORESET # 0.

When the network side device sends only one RAR in the RAR window, the overhead of the network can be reduced.

The following describes a method for determining a quasi-co-located downlink RS according to an embodiment of the present application, by taking an example that a terminal determines a downlink RS of a target channel QCL according to an explicit indication of RAR or Msg 4.

The network side device may indicate the downlink RS quasi co-located in the reception of b), c), d), e), f) in the RAR or the PDCCH for scheduling the RAR, so that the flexibility of selecting different beams for downlink transmission by the network side device can be improved.

One possible application scenario of the scheme is that the network side device issues multiple RARs in an RAR window, and the multiple RARs are quasi co-located with different downlink RSs respectively to ensure the receiving performance of the RARs, however, for a PDCCH for subsequently scheduling Msg3 retransmission, a PDCCH for scheduling contention resolution information, a PDSCH (i.e., msg 4) for transmitting contention resolution information, and the network side device only uses one beam for transmission, i.e., the downlink transmissions are quasi co-located with one downlink RS only, and then the network side device needs to indicate the downlink transmissions and which downlink RS are quasi co-located in the RAR.

Another possible application scenario of the scheme is that the network side device only sends one RAR, but PDCCH resources or PDSCH transmission resources are limited on RAR transmission time resources corresponding to a certain downlink RS; another downlink RS which is not necessarily optimal is selected for RAR transmission, but the network side device may indicate the subsequent b), c), d), e), f) to receive the quasi-co-located downlink RS in the RAR.

Optionally, the network side device may indicate, in the Msg4, a downlink RS where the reception of f) is quasi co-located; one possible usage scenario is that a network side device instructs a terminal to report CSI in Msg3, where measurement values reported by the CSI may include L1-RSRP, L1-SINR, CQI, and the like, and for different downlink RSs, corresponding measurement values are reported respectively. The network side device can instruct the terminal to execute the reported behavior through the RAR. After receiving the measurement values of different downlink RSs, the network side device may indicate the quasi co-located downlink RSs of the PDCCH monitored in CORESET # 0. The method provides a method for indicating the optimal quasi co-located downlink RS for the network side equipment.

It should be noted that, in the method for determining a quasi-co-located downlink RS provided in the embodiment of the present application, the execution main body may be a device for determining a quasi-co-located downlink RS, or a control module in the device for determining a quasi-co-located downlink RS, for executing the method for determining a quasi-co-located downlink RS. The embodiment of the present application describes a quasi co-located downlink RS determination device provided in the embodiment of the present application, with reference to an example in which the quasi co-located downlink RS determination device performs a method for determining a quasi co-located downlink RS.

Fig. 7 is a schematic structural diagram of a device for determining a quasi-co-located downlink RS according to an embodiment of the present application, and as shown in fig. 7, the device 700 for determining a quasi-co-located downlink RS includes:

a determining module 701, configured to determine a target downlink RS of a QCL quasi-co-located with an antenna port of a demodulation reference signal DMRS of a target downlink channel when a terminal performs physical random access channel PRACH retransmission; wherein the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting the RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

The device for determining the quasi-co-location downlink RS, provided by the embodiment of the application, determines the target downlink RS quasi-co-located with the antenna port of the DMRS of the target downlink channel by the terminal under the condition of PRACH repeated transmission, so that the terminal only needs to monitor the target downlink channel quasi-co-located with the target downlink RS, monitoring resources can be saved, and random access efficiency is improved.

Optionally, the determining module 701 is specifically configured to, when the target downlink channel includes the PDCCH for scheduling the RAR, determine, based on target information, a target downlink RS that is quasi-co-located with an antenna port of a DMRS of the PDCCH for scheduling the RAR; wherein the target information comprises at least one of the following information:

the time domain position of monitoring opportunity monitoring of PDCCH;

at least one downlink synchronization signal/physical broadcast channel block SSB;

at least one downlink channel state information reference signal (CSI-RS);

and the terminal sends at least one downlink RS associated with the target random access channel opportunity (RO) of the PRACH preamble.

Optionally, the at least one downlink SSB includes at least one of: all SSBs sent by the serving cell of the terminal; and the terminal repeatedly sends at least one SSB associated with the PRACH.

Optionally, the at least one downlink CSI-RS comprises at least one of: all CSI-RSs associated with random access resources used by the terminal; and the terminal repeatedly transmits at least one CSI-RS associated with the PRACH.

Optionally, the determining module 701 is specifically configured to, when the target information includes a time domain position of a monitoring event of the PDCCH, respectively determine, based on a downlink RS associated with at least one PRACH corresponding to the time domain position of the monitoring event of at least one PDCCH in an RAR window, a target downlink RS quasi co-located with an antenna port of the DMRS of the at least one PDCCH; wherein, the time sequence of the time domain position of the monitoring interference of the at least one PDCCH corresponds to the index of the downlink RS associated with the at least one PRACH in an ascending order.

Optionally, the at least one downlink RS associated with the target random access channel opportunity RO for sending the PRACH preamble by the terminal includes at least one of:

the terminal carries out at least one downlink RS associated with the first RO or the last RO in a plurality of ROs which are transmitted repeatedly by the RO;

at least one downlink RS associated with one RO in a plurality of ROs which are repeatedly transmitted by the terminal and instructed by the network side equipment;

the terminal carries out first x downlink RSs or last x downlink RSs associated with a plurality of ROs for RO repeated transmission; wherein x is greater than or equal to 1.

Optionally, the determining module 701 is specifically configured to determine, based on the detected downlink RS quasi co-located with the PDCCH for scheduling RAR, a target downlink RS quasi co-located with an antenna port of the DMRS of the target downlink channel.

Optionally, the determining module 701 is specifically configured to acquire a downlink RS indicated by the network side device in the PDCCH for scheduling the RAR or the PDSCH for transmitting the RAR; and determining a target downlink RS quasi co-located with an antenna port of the DMRS of the target downlink channel based on the obtained downlink RS indicated by the network side equipment in the PDCCH for scheduling RAR or the PDSCH for transmitting RAR.

Optionally, the determining module 701 is specifically configured to, when the target downlink channel includes the PDCCH for the terminal to monitor in CORESET #0, determine, based on a received downlink RS indicated in Msg4 sent by the network side device, a target downlink RS quasi-co-located with an antenna port of the DMRS for the PDCCH for the terminal to monitor in CORESET # 0.

Optionally, the apparatus further comprises:

the sending module is used for sending the Msg3 to the network side equipment; the Msg3 carries at least one channel state information CSI of a downlink RS.

Optionally, the apparatus further comprises:

and the monitoring module is used for monitoring a target downlink channel quasi co-located with the target downlink RS by the terminal based on the target downlink RS.

The determining device of the quasi co-located downlink RS in the embodiment of the present application may be a device, a device or an electronic device having an operating system, or a component, an integrated circuit, or a chip in a terminal. The device or the electronic equipment can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may include, but is not limited to, the type of the terminal 11 listed above, and the non-mobile terminal may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a television (television), a teller machine (teller machine), a self-service machine (kiosk), or the like, and the embodiments of the present application are not limited in particular.

The apparatus for determining a quasi-co-located downlink RS provided in this embodiment of the present application can implement each process implemented by the method embodiments of fig. 2 to fig. 6, and achieve the same technical effect, and is not described herein again to avoid repetition.

Fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application, and as shown in fig. 8, a terminal 800 according to an embodiment of the present application includes: the processor 801, the memory 802, and a program or an instruction stored in the memory 802 and capable of being executed on the processor 801, where the program or the instruction is executed by the processor 801 to implement each process of the foregoing method for determining a quasi-co-located downlink RS, and can achieve the same technical effect, and are not described herein again to avoid repetition.

An embodiment of the present application further provides a terminal, including a processor and a communication interface, where the processor is configured to: under the condition that the PRACH is repeatedly transmitted by the terminal, determining a target downlink RS which is quasi co-located with an antenna port of a DMRS (demodulation reference signal) of a target downlink channel; wherein the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

a PDCCH for the terminal to monitor in a control resource set, CORESET # 0.

The terminal embodiment corresponds to the terminal-side method embodiment, and all implementation processes and implementation manners of the method embodiment can be applied to the terminal embodiment and can achieve the same technical effect.

Fig. 9 is a second schematic structural diagram of a terminal provided in the embodiment of the present application, and as shown in fig. 9, the terminal 900 provided in the embodiment of the present application includes, but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and a processor 910, etc.

Those skilled in the art will appreciate that terminal 900 may further include a power supply (e.g., a battery) for supplying power to various components, and the power supply may be logically connected to processor 910 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system. Drawing (A)9The terminal structures shown in the figures do not constitute limitations of the terminal, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used and will not be described again.

It should be understood that, in the embodiment of the present application, the input Unit 904 may include a Graphics Processing Unit (GPU) 9041 and a microphone 9042, and the Graphics Processing Unit 9041 processes image data of a still picture or a video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 907 includes a touch panel 9071 and other input devices 9072. A touch panel 9071 also referred to as a touch screen. The touch panel 9071 may include two parts, a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

In this embodiment, the radio frequency unit 901 receives downlink data from a network device and then processes the downlink data to the processor 910; in addition, the uplink data is sent to the network side equipment. Generally, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

Memory 909 may be used to store software programs or instructions and various data. The memory 909 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. In addition, the Memory 909 may include a high-speed random access Memory and may also include a nonvolatile Memory, wherein the nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), or a flash Memory. Such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

Processor 910 may include one or more processing units; alternatively, the processor 910 may integrate an application processor, which mainly handles operating systems, user interfaces, and applications or instructions, etc., and a modem processor, which mainly handles wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into processor 910.

The processor 910 is configured to determine a target downlink RS of a QCL that is quasi co-located with an antenna port of a demodulation reference signal DMRS of a target downlink channel, when a terminal performs physical random access channel PRACH retransmission; wherein, the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting the RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

a PDCCH for the terminal to monitor in a control resource set, CORESET # 0.

According to the terminal provided by the embodiment of the application, under the condition of PRACH repeated transmission, the terminal determines the target downlink RS quasi-co-located with the antenna port of the DMRS of the target downlink channel, so that the terminal only needs to monitor the target downlink channel quasi-co-located with the target downlink RS, monitoring resources can be saved, and the random access efficiency is improved.

Optionally, the processor 910 is further configured to: determining a target downlink RS quasi-co-located with an antenna port of a DMRS of the PDCCH for scheduling the RAR based on target information under the condition that the target downlink channel comprises the PDCCH for scheduling the RAR; wherein the target information comprises at least one of the following information:

the time domain position of monitoring opportunity monitoring of PDCCH;

at least one downlink channel state information reference signal (CSI-RS);

Optionally, the processor 910 is further configured to: respectively determining target downlink RSs quasi-co-located with antenna ports of the DMRS of at least one PDCCH based on downlink RSs associated with at least one PRACH corresponding to the time domain position of the monitoring occasion of the at least one PDCCH in an RAR window under the condition that the target information comprises the time domain position of the monitoring occasion of the PDCCH;

wherein, the time sequence of the time domain position of the monitoring interference of the at least one PDCCH corresponds to the index of the downlink RS associated with the at least one PRACH in an ascending order.

at least one downlink RS associated with the first RO or the last RO in a plurality of ROs repeatedly transmitted by the terminal;

Optionally, the processor 910 is further configured to: and determining a target downlink RS quasi-co-located with an antenna port of the DMRS of the target downlink channel based on the detected downlink RS quasi-co-located with the PDCCH for scheduling RAR.

Optionally, the processor 910 is further configured to: acquiring a downlink RS (reference signal) indicated by the network side equipment in the PDCCH (physical downlink control channel) for scheduling the RAR or the PDSCH (physical downlink shared channel) for transmitting the RAR; and determining a target downlink RS quasi-co-located with an antenna port of the DMRS of the target downlink channel based on the downlink RS indicated by the acquired network side equipment in the PDCCH for scheduling the RAR or the PDSCH for transmitting the RAR.

Optionally, the processor 910 is further configured to: and under the condition that the target downlink channel comprises the PDCCH used for the terminal to monitor in CORESET #0, determining a target downlink RS quasi-co-located with an antenna port of the DMRS used for the PDCCH monitored by the terminal in CORESET #0 based on the received downlink RS indicated in the Msg4 sent by the network side equipment.

Optionally, the radio frequency unit 901 is configured to: sending the Msg3 to the network side equipment; the Msg3 carries at least one channel state information CSI of a downlink RS.

Optionally, the processor 910 is further configured to: and monitoring a target downlink channel quasi co-located with the target downlink RS based on the target downlink RS.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the foregoing method for determining a quasi co-located downlink RS, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the embodiment of the method for determining a quasi co-located downlink RS, and the same technical effects can be achieved.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

The embodiment of the present application further provides a computer program/program product, where the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to implement each process of the foregoing method for determining a quasi co-located downlink RS, and can achieve the same technical effect, and in order to avoid repetition, the details are not repeated here.

It should be noted that, in this document, 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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions recited, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for determining a quasi-co-located downlink Reference Signal (RS), comprising:

a physical downlink shared channel, PDSCH, for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

2. The method for determining the quasi-co-located downlink RS according to claim 1, wherein the terminal determines the target downlink reference signal RS quasi-co-located with the antenna port of the DMRS of the target downlink channel, and comprises:

under the condition that the target downlink channel comprises the PDCCH for scheduling the RAR, the terminal determines a target downlink RS quasi-co-located with an antenna port of the DMRS of the PDCCH for scheduling the RAR based on target information; wherein the target information comprises at least one of the following information:

monitoring the time domain position of the opportunity monitoring occasion of the PDCCH;

at least one downlink channel state information reference signal (CSI-RS);

3. The method of claim 2, wherein the at least one downlink SSB comprises at least one of:

all SSBs sent by the serving cell of the terminal;

and the terminal repeatedly sends at least one SSB associated with the PRACH.

4. The method of claim 2, wherein the at least one downlink CSI-RS comprises at least one of:

all CSI-RSs associated with random access resources used by the terminal;

and the terminal repeatedly transmits at least one CSI-RS associated with the PRACH.

5. The method for determining the quasi-co-located downlink RS according to claim 2, wherein the determining, by the terminal, the target downlink RS quasi-co-located with the DMRS of the PDCCH for scheduling the RAR based on the target information comprises:

under the condition that the target information comprises the time domain position of the monitoring occasion of the PDCCH, the terminal respectively determines target downlink RSs quasi-co-located with antenna ports of the DMRS of the at least one PDCCH on the basis of downlink RSs associated with the at least one PRACH corresponding to the time domain position of the monitoring occasion of the at least one PDCCH in a RAR window;

6. The method for determining the quasi-co-located downlink RS according to claim 2, wherein the at least one downlink RS associated with the target random access channel opportunity (RO) for the terminal to send the PRACH preamble includes at least one of:

the terminal carries out first x downlink RSs or last x downlink RSs associated with a plurality of ROs for repeated RO transmission; wherein x is greater than or equal to 1.

7. The method for determining the quasi-co-located downlink RS according to claim 2, wherein the terminal determines the target downlink reference signal RS quasi-co-located with the antenna port of the DMRS of the target downlink channel, and comprises:

and the terminal determines a target downlink RS quasi co-located with an antenna port of the DMRS of the target downlink channel based on the detected downlink RS quasi co-located with the PDCCH for scheduling RAR.

8. The method for determining the quasi-co-located downlink RS according to claim 2, wherein the terminal determines the target downlink reference signal RS quasi-co-located with the antenna port of the DMRS of the target downlink channel, and comprises:

the terminal acquires a downlink RS indicated by the network side equipment in the PDCCH for scheduling RAR or the PDSCH for transmitting RAR;

and the terminal determines a target downlink RS quasi-co-located with an antenna port of the DMRS of the target downlink channel based on the acquired downlink RS indicated by the network side equipment in the PDCCH for scheduling RAR or the PDSCH for transmitting RAR.

9. The method for determining the quasi-co-located downlink RS according to claim 1, wherein the terminal determines the target downlink reference signal RS quasi-co-located with the antenna port of the DMRS of the target downlink channel, and comprises:

and under the condition that the target downlink channel comprises the PDCCH used for the terminal to monitor in CORESET #0, the terminal determines a target downlink RS quasi-co-located with an antenna port of the DMRS used for the PDCCH monitored by the terminal in CORESET #0 based on the received downlink RS indicated in the Msg4 sent by the network side equipment.

10. The method for determining the quasi-co-located downlink RS according to claim 9, wherein the terminal determines, based on the received downlink RS indicated in the Msg4 sent by the network side device, that the target downlink RS is quasi-co-located with the antenna port of the DMRS for the PDCCH monitored by the terminal in the CORESET #0, and the method further includes:

the terminal sends Msg3 to the network side equipment; the Msg3 carries at least one channel state information CSI of a downlink RS.

11. The method of claim 1, wherein the method further comprises:

and the terminal monitors a target downlink channel quasi co-located with the target downlink RS based on the target downlink RS.

12. An apparatus for determining a quasi-co-located downlink Reference Signal (RS), comprising:

the device comprises a determining module, a transmitting module and a receiving module, wherein the determining module is used for determining a target downlink RS of a quasi co-location QCL (Quadrature reference clock) with an antenna port of a demodulation reference signal (DMRS) of a target downlink channel under the condition that a terminal carries out Physical Random Access Channel (PRACH) repeated transmission; wherein, the target downlink channel comprises at least one of the following channels:

a physical downlink shared channel, PDSCH, for transmitting RAR;

a PDCCH for scheduling the Msg3 retransmission;

a PDSCH for transmitting contention resolution information;

a PDCCH for scheduling contention resolution information;

a PDCCH for the terminal to monitor in a control resource set, CORESET # 0.

13. A terminal comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method for determining quasi co-located downlink reference signals, RS, according to any one of claims 1 to 11.

14. A readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the method of determining a quasi co-located downlink reference signal, RS, according to any of claims 1-11.