WO2022233281A1

WO2022233281A1 - Method, apparatus and device for determining reference pdcch, and readable storage medium

Info

Publication number: WO2022233281A1
Application number: PCT/CN2022/090604
Authority: WO
Inventors: 曹昱华; 李岩; 左君; 郑毅; 王飞
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2021-05-07
Filing date: 2022-04-29
Publication date: 2022-11-10
Also published as: CN115314151A

Abstract

Embodiments of the present application provide a method, apparatus and device for determining a reference physical downlink control channel (PDCCH), and a readable storage medium. The method comprises: detecting a plurality of PDCCHs; and according to one or more of reception time of the PDCCHs, the identifiers (IDs) of search spaces corresponding to the PDCCHs, and the IDs of control resource sets (CORESETs) corresponding to the PDCCHs, taking a certain PDCCH in the plurality of PDCCHs as a reference PDCCH.

Description

Reference PDCCH determination method, apparatus, device and readable storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202110494531.0 and the application date of May 7, 2021, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application in its entirety. .

technical field

The embodiments of the present application relate to the field of communications technologies, and in particular, to a method, apparatus, device, and readable storage medium for determining a reference physical downlink control channel (Physical Downlink Control Channel, PDCCH).

Background technique

For the Ultra-reliable low latency communication (URLLC) scenario of Multiple Transmitting Receiving Point (Multi-TRP), if two TRPs each send PDCCH to the same user, the downlink control information carried by the two TRPs (Downlink Control Information, DCI) is the same, and the indicated slot offset (slot offset) is also the same, but the time at which the terminal receives the two PDCCHs is different, so how the UE determines the reference PDCCH is an urgent problem to be solved.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a method, apparatus, device, and readable storage medium for determining a reference PDCCH, so as to solve the problem of how to determine a reference PDCCH.

A first aspect provides a method for determining a reference PDCCH, applied to a terminal, including:

Detect multiple PDCCHs;

According to one or more of the reception time of the PDCCH, the identifier (ID) of the search space (Search Space) corresponding to the PDCCH candidate, and the ID of the control resource set (CORESET) corresponding to the PDCCH, one or more of the multiple PDCCH The PDCCH is used as a reference PDCCH.

Optionally, according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH, one PDCCH in the multiple PDCCHs is used as the reference PDCCH, including:

using the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

The ID of the Search Space corresponding to the first PDCCH is greater than or less than the ID of the Search Space corresponding to the second PDCCH;

The ID of the CORESET corresponding to the first PDCCH is larger or smaller than the ID of the CORESET corresponding to the second PDCCH;

the reception time of the first symbol of the first PDCCH is before or after the reception time of the first symbol of the second PDCCH;

Wherein, the second PDCCH is other PDCCH except the second PDCCH among the plurality of PDCCHs.

Optionally, the multiple PDCCHs are used to schedule the same physical downlink shared channel (Physical Downlink Shared CHannel, PDSCH), physical uplink shared channel (Physical Uplink Shared CHannel, PUSCH), channel state information reference signal (Channel State Information Reference). One or more of Signal, CSI-RS) and Sounding Reference Signal (Sounding Reference Signal, SRS).

Optionally, the ID of the Search Space corresponding to the first PDCCH is larger or smaller than the ID of the Search Space corresponding to the second PDCCH, or, the ID of the CORESET corresponding to the first PDCCH is larger or smaller than the CORESET corresponding to the second PDCCH. In the case of the ID of , the transmission time of the first symbol of the first PDCCH is earlier or later than the transmission time of the first symbol of the second PDCCH.

Optionally, the method further includes:

Taking the reception time of the first symbol of the reference PDCCH as the reference time;

or,

Taking the sum or difference between the reception time of the first symbol of the second PDCCH and the transmission time intervals of the multiple PDCCHs as the reference time;

Wherein, when multiple PDCCHs schedule the same PDSCH, PUSCH, CSI-RS or SRS, the reference time and the corresponding transmission time interval of the PDSCH, PUSCH, CSI-RS or SRS are taken as the first time interval ( time offset);

Or, in the case where multiple PDCCHs schedule the same PDSCH or CSI-RS, the time interval between the reference time and the corresponding PDSCH or CSI-RS is taken as the second time offset, and the second time offset is the difference between the threshold and the threshold. The size relationship is used to determine the Quasi Co-Location (QCL) relationship of PDSCH or CSI-RS;

Or, in the case where multiple PDCCHs schedule the same PDSCH or PUSCH, the reference time is used as the reception time of the PDCCH on which the PDSCH or PUSCH is scheduled.

Optionally, when multiple PDCCHs schedule the same PDSCH or PUSCH, the last symbol of the reference PDCCH is used as the last symbol of the multiple PDCCHs.

Optionally, the time starting point of the first time offset or the second time offset is equal to the receiving time of the reference PDCCH;

or,

The time starting point of the first time offset or the second time offset is equal to the sum or difference between the receiving time of the reference PDCCH and the transmission time interval of the multiple PDCCHs.

Optionally, the transmission time intervals of the multiple PDCCHs are indicated explicitly or implicitly through RRC signaling;

or,

The transmission time intervals of the plurality of PDCCHs are indicated by DCI.

In a second aspect, a device for determining a reference PDCCH is provided, applied to a terminal, including:

A detection module for detecting multiple PDCCHs;

A determination module, configured to use one or more of the multiple PDCCHs as a reference PDCCH according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH.

Optionally, the determining module is further configured to: use the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

Optionally, the multiple PDCCHs are used to schedule one or more of the same PDSCH, PUSCH, CSI-RS and SRS.

Optionally, the determining module is further configured to: use the reception time of the first symbol of the reference PDCCH as the reference time; or use the reception time of the first symbol of the second PDCCH with the multiple The sum or difference of the transmission time intervals of the PDCCH is used as the reference time;

Wherein, when multiple PDCCHs schedule the same PDSCH, PUSCH, CSI-RS or SRS, the reference time and the corresponding transmission time interval of the PDSCH, PUSCH, CSI-RS or SRS are taken as the first time offset;

Or, in the case where multiple PDCCHs schedule the same PDSCH or CSI-RS, the time interval between the reference time and the corresponding PDSCH or CSI-RS is taken as the second time offset, and the second time offset is the difference between the threshold and the threshold. The size relationship is used to determine the QCL relationship of PDSCH or CSI-RS;

In a third aspect, a terminal is provided, including: a processor, a memory, and a program stored on the memory and executable on the processor, the program being executed by the processor as described in the first aspect steps of the method described.

In a fourth aspect, a readable storage medium is provided, and a program is stored on the readable storage medium, and when the program is executed by a processor, steps including the method of the first aspect are implemented.

In the embodiment of this application, for the Multi-TRP PDCCH repetition scenario, the realization of determining the reference PDCCH can help define the time reference point, and the scheduling time of PDSCH/PUSCH/CSI-RS/SRS used in this scenario is determined, PDSCH/CSI- The QCL relationship of the RS is determined, the scheduling timing relationship of PDSCH/PUSCH under multiple HARQ processes is determined, and the case where the target PDCCH is not detected can be supported.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustrating preferred embodiments only and are not to be considered limiting of the application. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

Fig. 1 is the schematic diagram of time slot offset;

2a and 2b are schematic diagrams of ordered scheduling;

Fig. 3 is one of the schematic diagrams of out-of-order scheduling;

Fig. 4 is the schematic diagram of the starting time reference point of time slot offset;

5 is a schematic diagram of a QCL relationship of PDSCH or CSI-RS;

FIG. 6 is the second schematic diagram of out-of-order scheduling;

FIG. 7 is a schematic diagram of a wireless communication system to which an embodiment of the present application can be applied

8 is a flowchart of a method for determining a reference PDCCH provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of an apparatus for determining a reference PDCCH provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a terminal provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The term "comprising" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to the explicit Those steps or units are explicitly listed, but may include other steps or units not expressly listed or inherent to the process, method, product or apparatus. In addition, the use of "and/or" in the description and the claims indicates at least one of the connected objects, such as A and/or B, indicating that there are three cases including A alone, B alone, and both A and B.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

It is worth noting that the technologies described in the embodiments of this application are not limited to Long Term Evolution (LTE)/LTE-Advanced (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code Division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (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 technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. However, the following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, although these techniques are also applicable to applications other than NR system applications, such as 6th generation ( 6th Generation, 6G) communication system.

In order to facilitate understanding of the embodiments of the present application, the following technical points are first introduced below:

1. Introduction to time slot offset (offset):

In the related art, in a single-transmission point (Single-TRP, STRP) scenario, assuming that the physical downlink control channel (Physical Downlink Control Channel, PDCCH) receiving time is the first time (n), the base station will be the physical downlink corresponding to the PDCCH. Shared Channel (Physical Downlink Shared CHannel, PDSCH)/Physical Uplink Shared CHannel (PUSCH)/Channel State Information Reference Signal (CSI-RS)/Sounding Reference Signal (SRS) ) to configure the slot offset (slot offset), then the corresponding PDSCH, PUSCH, CSI-RS, and SRS transmission time should be the second time (n+slot offset), see Figure 1.

2. Quasi Co-Location (QCL) reference acquisition:

In the related art, the acquisition of the QCL reference needs to go through radio resource control (Radio Resource Control, RRC) configuration, medium access control-control element (Medium Access Control-Control Element, MAC-CE) activation and downlink control information (Downlink Control Information) , DCI) indicates 3 steps:

1) RRC configures M transmission configuration indication (Transmission Configuration Indication, TCI) states;

2) MAC CE selects up to 8 TCI states from M;

3) DCI format 1_1 (DCI format 1_1) indicates at most 8 states selected from the MAC CE, and the terminal (for example, user equipment (User Equipment, UE)) obtains the received PDSCH demodulation reference signal (Demodulation Reference) according to this TCI state. Signal, DMRS) QCL source signal and type.

If DCI format 1_1 contains the TCI information field:

i. If the time interval from the PDCCH reception time to the corresponding PDSCH transmission is greater than the threshold value (timeDurationForQCL), then obtain the QCL reference according to the TCI information field in the DCI;

ii. On the contrary, keep the same QCL as the CORESET with the lowest identity (Identity, ID) in the nearest slot containing the control resource set (Control-Resource Set, CORESET).

If DCI format 1_1 does not contain the TCI information field, or is scheduled with DCI format 1_0:

i. If the time interval from the PDCCH reception time to the corresponding PDSCH transmission is greater than the threshold value (timeDurationForQCL), then obtain the QCL reference according to the TCI state of the PDCCH that schedules the PDSCH;

ii. Conversely, maintain the same QCL as the CORESET with the lowest ID in the nearest slot containing the CORESET.

3. Out-of-order/in-order scheduling of PDCCH to PDSCH (PDCCH-to-PDSCH) and PDCCH to PUSCH (PDCCH-to-PUSCH).

(1) In-order scheduling:

Referring to Figure 2a and Figure 2b, the hybrid automatic repeat request process number (Hybrid Automatic Repeat reQuest, HARQ process number) is different: the PDSCH and PUSCH scheduled by the later DCI must be transmitted after the PDSCH and PUSCH scheduled by the first DCI;

The HARQ process number is the same: DCI scheduling PDSCH and PUSCH can only be sent after the previous PDSCH/PUSCH transmission.

(2) out-of-order scheduling:

Referring to FIG. 3 , the PUSCH scheduled by the later DCI is allowed to be transmitted before the PUSCH scheduled by the earlier DCI, but the two DCIs are required to belong to 2 different TRPs.

First, the definition of slot offset: scheduling the same PDSCH/PUSCH/CSI-RS/SRS slot offset (Slot offset for scheduling the same PDSCH/PUSCH/CSI-RS/SRS)

Referring to Figure 4, for a multi-TRP (Multi-TRP) ultra-reliable low latency communication (Ultra-reliable low latency communication, URLLC) scenario, if two TRPs send PDCCHs to the same user, the DCIs they carry are the same, and the indicated The slot offset is also the same, but the time at which the UE receives the two PDCCH candidates is different, so which time should the UE use as the starting time reference point of the slot offset?

2. The problem of determining the QCL relationship of PDSCH/CSI-RS

Referring to Figure 5, the time interval between the receiving time of the PDCCH and the receiving time of the PDSCH/CSI-RS is defined as time offset; in the Multi-TRP scenario, under a fixed threshold (timeDurationForQCL), if the PDCCH candidates sent by the two TRPs If the (candidate) time is different, the UE uses different PDCCH candidates as the reference point for calculating the time offset, and the determined QCL relationship may also be different.

3. Definition of out-of-order/in-order scheduling

Referring to Figure 6, when one PDCCH contains multiple PDCCH candidates and the same PDSCH/PUSCH is scheduled, the UE may detect all or part of the PDCCH candidates, and then the out-of-order scheduling needs to be redefined. The figure shows that only the first candidate is detected in the PDCCH corresponding to PDSCH1/PUSCH1; only the second candidate is detected in the PDCCH corresponding to PDSCH2/PUSCH2, so should this situation be regarded as out-of- order scheduling?

To sum up, in the related art, taking two TRPs as an example, in FIG. 4 , TRP1 and TRP2 respectively send PDCCHs to the UE, and the UE receives the PDCCHs sent by the two TRPs at different times. From the perspective of the UE, the UE can use the reception time of the first PDCCH as a reference point and combine the slot offset to calculate the transmission time of PUSCH and SRS and the reception time of PDSCH and CSI-RS. It is also possible to use the reception time of the second PDCCH as a reference point and combine the slot offset to calculate the transmission time of PUSCH and SRS and the reception time of PDSCH and CSI-RS. The receiving moments are different, so that the UE cannot accurately transmit PUSCH and SRS, or the UE cannot accurately receive PDSCH and CSI-RS. In addition, from the point of view of the base station, TRP1 sends the first PDCCH (PDCCH candidate2 in Figure 4) first, and then sends the second PDCCH (PDCCH candidate1 in Figure 4) after TRP2. In this way, the first PDCCH sent by TRP1 The receiving time should be used as a reference point, combined with the slot offset, to calculate the sending time of PUSCH and SRS and the receiving time of PDSCH and CSI-RS. However, if the UE uses the reception time of the second PDCCH as a reference point and calculates the transmission time of PUSCH and SRS and the reception time of PDSCH and CSI-RS in combination with slot offset, the base station cannot schedule PDSCH and PUSCH according to its own expected time. , CSI-RS, SRS.

In the related art, taking two TRPs as an example, in FIG. 5 , TRP1 and TRP2 respectively send PDCCH (also referred to as PDCCH candidate) to the UE, and the UE receives the PDCCH sent by the two TRPs at different times. From the UE's point of view, the UE can use the reception time of the first PDCCH as a reference point, combined with timeDurationForQCL, to determine the source of obtaining QCL information, or it can use the reception time of the second PDCCH as a reference point, combined with timeDurationForQCL, determine the acquisition of QCL The source of the information, however, the two determined sources are different, resulting in different contents of the acquired QCL information, and thus the UE cannot accurately use the QCL information to receive PDSCH and CSI-RS. In addition, from the point of view of the base station, TRP1 first sends the first PDCCH (Second candidate2 in Figure 5), and then TRP2 sends the second PDCCH (First candidate1 in Figure 5), so that the first PDCCH sent by TRP1 The receiving time should be used as a reference point, combined with timeDurationForQCL, to determine the source of obtaining QCL information. However, if the UE uses the reception time of the second PDCCH as a reference point, combines timeDurationForQCL to determine the source of obtaining QCL information, and then uses the QCL information to receive PDSCH and CSI-RS, the PDSCH and CSI-RS scheduled by the base station will not be available to the UE. Accurately received.

In the related art, taking two TRPs as an example, in FIG. 6 , TRP1 sends two PDCCHs to the UE successively (First candidate2 and First candidate1 in FIG. 6 ), and TRP2 successively sends two PDCCHs to the UE (Second in FIG. 6 ). candidate2 and Second candidate1), First candidate1 and Second candidate1 jointly schedule PDSCH1 or PUSCH1, First candidate2 and Second candidate2 jointly schedule PDSCH2 or PUSCH2, UE only detects the first candidate sent by TRP1 and the second sent by TRP2 candidate2. From the UE point of view, it can be considered as out of order scheduling, that is, only when two DCIs are sent independently from two different TRPs, the PDSCH scheduled by the later DCI is allowed to precede the PDSCH scheduled by the earlier DCI transmission, or the PUSCH scheduled by the later DCI is transmitted before the PUSCH scheduled by the earlier DCI. However, from the point of view of the base station, it can be considered as in-order scheduling, that is, the first candidate2 is before the first candidate1, and the next PDCCH (First candidate1) scheduling can only be sent after the PDSCH and PUSCH scheduled by the previous PDCCH (First candidate2) are transmitted. PDSCH and PUSCH. As a result, the expected scheduling situation on both sides of the UE and the base station is inconsistent, which leads to scheduling problems, and the scheduled PDSCH and PUSCH cannot be accurately received by the UE.

Based on this, in the embodiment of the present application, multiple PDCCHs are detected; according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH, from the multiple PDCCHs One PDCCH is used as a reference PDCCH.

It should be noted that, in the embodiment of this application, the reference PDCCH is selected based on the ID of the Search Space corresponding to the PDCCH, the ID of the CORESET corresponding to the PDCCH configured by the base station, and the time when the terminal itself receives the PDCCH, so as to ensure that the terminal and the base station side The schedule is processed at the same time.

Referring to FIG. 7 , a block diagram of a wireless communication system to which the embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 71 and a network-side device 72 . The terminal 71 may also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 71 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital computer Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted device (Vehicle User Equipment, VUE), pedestrian terminal (Pedestrian User Equipment, PUE) and other terminal-side devices, wearable devices include: bracelets, headphones, glasses, etc. It should be noted that, the embodiment of the present application does not limit the specific type of the terminal 71 .

The network side device 72 may be a base station or a core network, wherein 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 (Basic Service Set, BSS), Extended Service Set (Extended Service Set, ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN Access Point, WiFi Node, Send Transmitting Receiving Point (TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. The base station in the NR system is taken as an example, but the specific type of the base station is not limited.

Referring to FIG. 8 , an embodiment of the present application provides a method for determining a reference PDCCH, where the execution subject of the method may be a terminal, and the specific steps include: step 801 and step 802 .

Step 801: Detect multiple PDCCHs (or PDCCH candidates);

Step 802: According to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH, use one PDCCH among the plurality of PDCCHs as a reference PDCCH.

In an embodiment of the present application, according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH, one PDCCH in the plurality of PDCCHs is As a reference to the steps of PDCCH, include:

using the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

(1) the ID of the Search Space corresponding to the first PDCCH is greater than or less than the ID of the Search Space corresponding to the second PDCCH;

(2) The ID of the CORESET corresponding to the first PDCCH is larger or smaller than the ID of the CORESET corresponding to the second PDCCH;

(3) The reception time of the first symbol of the first PDCCH is before or after the reception time of the first symbol of the second PDCCH;

In an embodiment of the present application, the multiple PDCCHs are used to schedule one or more of the same PDSCH, PUSCH, CSI-RS and SRS.

In an embodiment of the present application, the ID of the Search Space corresponding to the first PDCCH is larger or smaller than the ID of the Search Space corresponding to the second PDCCH, or the ID of the CORESET corresponding to the first PDCCH is larger or smaller than In the case of the ID of the CORESET corresponding to the second PDCCH, the transmission time of the first symbol of the first PDCCH is earlier or later than the transmission time of the first symbol of the second PDCCH.

In one embodiment of the present application, the method further includes:

Use the reception time of the first symbol of the reference PDCCH as the reference time; or, use the sum or difference between the reception time of the first symbol of the second PDCCH and the transmission time intervals of the multiple PDCCHs as the reference time ;

In an embodiment of the present application, when multiple PDCCHs schedule the same PDSCH or PUSCH, the last symbol of the reference PDCCH is used as the last symbol of the multiple PDCCHs.

In an embodiment of the present application, the time starting point of the first time offset or the second time offset is equal to the receiving time of the reference PDCCH;

or,

In an embodiment of the present application, the transmission time intervals of the multiple PDCCHs are indicated explicitly or implicitly through RRC signaling;

or,

Embodiment 1: When multiple PDCCHs schedule the same PDSCH, PUSCH, CSI-RS or SRS, the definition of slot offset needs to determine the following four rules:

(1) Rule 1:

It is guaranteed that among the two associated PDCCH candidates, the PDCCH candidate whose corresponding Search Space ID (or CORESET ID) is smaller or larger is sent first in the time domain on the corresponding TRP.

(2) Rule 2:

The UE uses the PDCCH candidate with the earlier (or later) reception time as the reference PDCCH candidate.

(3) Rule 3:

i. If the UE detects all 2 PDCCH candidates, the UE can know the order of sending them according to the Search Space ID (or CORESET ID) of the two PDCCH candidates and Rule 1. Then the UE determines the reference PDCCH candidate in combination with Rule 2, and then determines the calculation start time of the slot offset.

ii. If the UE only detects one of the two PDCCH candidates, the UE can know that the PDCCH candidate is earlier or later in the time domain according to the Search Space ID (or CORESET ID) of the PDCCH candidate and Rule 1. .

a) If this PDCCH candidate is in the front of the time domain, and Rule 2 defines the PDCCH candidate in the front of the time domain as the reference PDCCH candidate, then the calculation start time of the slot offset = the reception time of this PDCCH candidate;

b) If this PDCCH candidate is later in the time domain, and Rule 2 defines the later PDCCH candidate as the reference PDCCH candidate, then the calculation start time of the slot offset=the reception time of this PDCCH candidate;

c) If the candidate is in the front of the time domain, and Rule 2 defines the PDCCH candidate in the back of the time domain as the reference PDCCH candidate, then the calculation start time of the slot offset = the reception time of this PDCCH candidate + the transmission of 2 PDCCH candidates time interval;

d) If the PDCCH candidate is later in the time domain, and Rule 2 defines the PDCCH candidate with the earlier time domain as the reference PDCCH candidate, then the calculation start time of the slot offset = the reception time of this PDCCH candidate - the sum of the two PDCCH candidates. sending time interval;

(4) Rule 4:

The transmission time interval of the two candidates may be explicitly configured by RRC or implicitly determined according to the RRC configuration, or indicated by DCI.

Embodiment 2: When multiple PDCCHs schedule the same PDSCH/CSI-RS, the following four rules are determined for the QCL relationship of PDSCH/CSI-RS:

(1) Rule 1:

(2) Rule 2:

The UE uses the PDCCH candidate whose reception time is later as the reference PDCCH candidate.

(3) Rule 3:

i. If the UE detects all 2 PDCCH candidates, the UE can know the order of sending them according to the Search Space ID (or CORESET ID) of the two PDCCH candidates and Rule 1. Then, in combination with Rule 2, the UE takes the PDCCH candidate with a later reception time as the reference PDCCH candidate, and then uses the reception time of the reference PDCCH candidate as the calculation start time of the time offset.

a) If the PDCCH candidate is later in the time domain, then the calculation start time of the time offset = the reception time of the PDCCH candidate.

b) If this PDCCH candidate is in the front of the time domain, then the calculation start time of the time offset = the reception time of this PDCCH candidate + the transmission time interval of 2 PDCCH candidates.

(4) Rule 4:

The transmission time interval of the two PDCCH candidates may be explicitly configured by RRC or implicitly determined according to the RRC configuration, or indicated by DCI.

Embodiment 3: When multiple PDCCHs schedule the same PDSCH or PUSCH, the definition of out-of-order/in-order scheduling determines the following four rules:

(1) Rule 1:

(2) Rule 2:

(3) Rule 3:

i. If the UE detects all 2 PDCCH candidates, the UE can know the order of sending them according to the Search Space ID (or CORESET ID) of the two PDCCH candidates and Rule 1. Then, in combination with Rule 2, the UE uses the PDCCH candidate with a later receiving time as the reference PDCCH candidate, and then uses the receiving time of the reference PDCCH candidate as the receiving time for scheduling the PDCCH corresponding to the PDSCH or PUSCH.

a) If the PDCCH candidate is later in the time domain, then the reception time of the PDCCH = the reception time of the PDCCH candidate.

b) If the PDCCH candidate is earlier in the time domain, then the receiving time of the PDCCH = the receiving time of the PDCCH candidate + the sending time interval of 2 PDCCH candidates

(4) Rule 4:

Referring to FIG. 9 , an embodiment of the present application provides an apparatus for determining a reference PDCCH, and the apparatus is applied to a terminal, including:

A detection module 901, configured to detect multiple PDCCHs;

The determining module 902 is configured to use one or more of the multiple PDCCHs as a reference PDCCH according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH.

In an embodiment of the present application, the determining module 902 is further configured to: use the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

In an embodiment of the present application, the determining module 902 is further configured to: use the reception time of the first symbol of the reference PDCCH as the reference time; or, use the reception time of the first symbol of the second PDCCH as the reference time The sum or difference with the transmission time intervals of the multiple PDCCHs is used as a reference time;

or,

The apparatus provided in this embodiment of the present application can implement each process implemented by the method embodiment shown in FIG. 8 , and achieve the same technical effect. To avoid repetition, details are not described here.

10 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application. The terminal 1000 includes but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user Input unit 1007, interface unit 1008, memory 1009, processor 1010 and other components.

Those skilled in the art can understand that the terminal 1000 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 1010 through a power management system, so as to manage charging, discharging, and power consumption through the power management system management and other functions. The terminal structure shown in FIG. 10 does not constitute a limitation on the terminal, and the terminal may include more or less components than shown, or combine some components, or arrange different components, which will not be repeated here.

It should be understood that, in this embodiment of the present application, the input unit 1004 may include a graphics processor (Graphics Processing Unit, GPU) 10041 and a microphone 10042. Such as camera) to obtain still pictures or video image data for processing. The display unit 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes a touch panel 10071 and other input devices 10072 . The touch panel 10071 is also called a touch screen. The touch panel 10071 may include two parts, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

In the embodiment of the present application, the radio frequency unit 1001 receives the downlink data from the network side device, and then processes it to the processor 1010; in addition, sends the uplink data to the network side device. Generally, the radio frequency unit 1001 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 1009 may be used to store software programs or instructions as well as various data. The memory 1009 may mainly include a stored program or instruction area and a storage data area, wherein the stored program or instruction area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.) and the like. In addition, the memory 1009 may include a high-speed random access memory, and may also include a non-volatile memory, wherein the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. For example at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

The processor 1010 may include one or more processing units; optionally, the processor 1010 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs or instructions, etc. Modem processors mainly deal with wireless communications, such as baseband processors. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 1010.

The terminal provided in this embodiment of the present application can implement each process implemented by the method embodiment shown in FIG. 8 , and achieve the same technical effect. To avoid repetition, details are not described here.

Embodiments of the present application further provide a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, each process of the method embodiment shown in FIG. To achieve the same technical effect, in order to avoid repetition, details are not repeated here.

Wherein, the processor is the processor in the terminal described in the foregoing embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The steps of the method or algorithm described in conjunction with the disclosure of the present application may be implemented in a hardware manner, or may be implemented in a manner of executing software instructions on a processor. The software instructions may be composed of corresponding software modules, and the software modules may be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium may be carried in an ASIC. Alternatively, the ASIC may be carried in the core network interface device. Of course, the processor and the storage medium may also exist in the core network interface device as discrete components.

Those skilled in the art should appreciate that, in one or more of the above examples, the functions described in this application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above descriptions are only specific embodiments of the present application, and are not intended to limit the The protection scope, any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present application shall be included within the protection scope of the present application.

Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The embodiments of the present application are described with reference to flowcharts and/or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A method for determining a reference physical downlink control channel PDCCH, applied to a terminal, includes:

Detect multiple PDCCHs;

According to one or more of the reception time of the PDCCH, the identification ID of the search space corresponding to the PDCCH, and the ID of the control resource set CORESET corresponding to the PDCCH, one PDCCH in the plurality of PDCCHs is used as the reference PDCCH.
The method according to claim 1, wherein, according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH, one or more of the plurality of PDCCHs is PDCCH as a reference PDCCH, including:

using the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

The ID of the Search Space corresponding to the first PDCCH is greater than or less than the ID of the Search Space corresponding to the second PDCCH;

The ID of the CORESET corresponding to the first PDCCH is larger or smaller than the ID of the CORESET corresponding to the second PDCCH;

the reception time of the first symbol of the first PDCCH is before or after the reception time of the first symbol of the second PDCCH;

Wherein, the second PDCCH is other PDCCH except the first PDCCH among the plurality of PDCCHs.
The method according to claim 1, wherein the multiple PDCCHs are used to schedule one of the same physical downlink shared channel PDSCH, physical uplink shared channel PUSCH, channel state information reference signal CSI-RS and sounding reference signal SRS or more.
The method according to claim 2, wherein the ID of the Search Space corresponding to the first PDCCH is greater than or smaller than the ID of the Search Space corresponding to the second PDCCH, or the ID of the CORESET corresponding to the first PDCCH is greater than or In the case of being smaller than the ID of the CORESET corresponding to the second PDCCH, the transmission time of the first symbol of the first PDCCH is earlier or later than the transmission time of the first symbol of the second PDCCH.
The method according to claim 1 or 2, wherein the method further comprises:

Taking the reception time of the first symbol of the reference PDCCH as the reference time;

or,

Taking the sum or difference between the reception time of the first symbol of the second PDCCH and the transmission time intervals of the multiple PDCCHs as the reference time;

Wherein, when multiple PDCCHs schedule the same PDSCH, PUSCH, CSI-RS or SRS, the reference time and the corresponding transmission time interval of the PDSCH, PUSCH, CSI-RS or SRS are taken as the first time interval time offset;

Or, in the case where multiple PDCCHs schedule the same PDSCH or CSI-RS, the time interval between the reference time and the corresponding PDSCH or CSI-RS is taken as the second time offset, and the second time offset is the difference between the threshold and the threshold. The size relationship is used to determine the quasi-co-located QCL relationship of PDSCH or CSI-RS;

Or, in the case where multiple PDCCHs schedule the same PDSCH or PUSCH, the reference time is used as the reception time of the PDCCH on which the PDSCH or PUSCH is scheduled.
The method according to claim 1, wherein in a case where multiple PDCCHs schedule the same PDSCH or PUSCH, the last symbol of the reference PDCCH is used as the last symbol of the multiple PDCCHs.
The method of claim 5, wherein,

The time starting point of the first time offset or the second time offset is equal to the receiving time of the reference PDCCH;

or,

The time starting point of the first time offset or the second time offset is equal to the sum or difference between the receiving time of the reference PDCCH and the transmission time interval of the multiple PDCCHs.
The method of claim 1, wherein,

The transmission time intervals of the multiple PDCCHs are explicitly or implicitly indicated by the radio resource control RRC signaling;

or,

The transmission time intervals of the multiple PDCCHs are indicated by the downlink control information DCI.
A device for determining a reference PDCCH, applied to a terminal, includes:

A detection module for detecting multiple PDCCHs;

A determination module, configured to use one or more of the multiple PDCCHs as a reference PDCCH according to one or more of the reception time of the PDCCH, the ID of the Search Space corresponding to the PDCCH, and the ID of the CORESET corresponding to the PDCCH.
The apparatus of claim 9, wherein,

The determining module is further configured to: use the first PDCCH in the plurality of PDCCHs as a reference PDCCH;

Wherein, the first PDCCH satisfies one or more of the following:

The ID of the Search Space corresponding to the first PDCCH is greater than or less than the ID of the Search Space corresponding to the second PDCCH;

The ID of the CORESET corresponding to the first PDCCH is larger or smaller than the ID of the CORESET corresponding to the second PDCCH;

the reception time of the first symbol of the first PDCCH is before or after the reception time of the first symbol of the second PDCCH;

Wherein, the second PDCCH is other PDCCH except the second PDCCH among the plurality of PDCCHs.
The apparatus of claim 9, wherein,

The multiple PDCCHs are used to schedule one or more of the same PDSCH, PUSCH, CSI-RS and SRS.
The apparatus according to claim 9, wherein the ID of the Search Space corresponding to the first PDCCH is greater than or smaller than the ID of the Search Space corresponding to the second PDCCH, or the ID of the CORESET corresponding to the first PDCCH is greater than or In the case of being smaller than the ID of the CORESET corresponding to the second PDCCH, the transmission time of the first symbol of the first PDCCH is earlier or later than the transmission time of the first symbol of the second PDCCH.
The apparatus according to claim 9 or 10, wherein the determining module is further configured to: use the reception time of the first symbol of the reference PDCCH as a reference time; or use the first symbol of the second PDCCH as a reference time The sum or difference between the reception time of the symbol and the transmission time intervals of the multiple PDCCHs is used as the reference time;

Wherein, when multiple PDCCHs schedule the same PDSCH, PUSCH, CSI-RS or SRS, the reference time and the corresponding transmission time interval of the PDSCH, PUSCH, CSI-RS or SRS are taken as the first time offset;

Or, in the case where multiple PDCCHs schedule the same PDSCH or CSI-RS, the time interval between the reference time and the corresponding PDSCH or CSI-RS is taken as the second time offset, and the second time offset is the difference between the threshold and the threshold. The size relationship is used to determine the QCL relationship of PDSCH or CSI-RS;

Or, in the case where multiple PDCCHs schedule the same PDSCH or PUSCH, the reference time is used as the reception time of the PDCCH on which the PDSCH or PUSCH is scheduled.
The apparatus according to claim 9, wherein in a case where multiple PDCCHs schedule the same PDSCH or PUSCH, the last symbol of the reference PDCCH is used as the last symbol of the multiple PDCCHs.
A terminal, comprising: a processor, a memory, and a program stored on the memory and executable on the processor, the program being executed by the processor to implement any one of claims 1 to 8 the steps of the method.
A readable storage medium having a program stored on the readable storage medium, when the program is executed by a processor, the steps including the method according to any one of claims 1 to 8 are implemented.