CN113453354A

CN113453354A - Physical downlink control channel monitoring method, user terminal and readable storage medium

Info

Publication number: CN113453354A
Application number: CN202010231312.9A
Authority: CN
Inventors: 赵思聪; 高兴航
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-09-28
Anticipated expiration: 2040-03-27
Also published as: CN113453354B; WO2021190523A1

Abstract

A physical downlink control channel monitoring method, a user terminal and a readable storage medium are provided, the method includes: receiving downlink control information at the nth time slot; when the downlink control information comprises switching indication information of a physical downlink control channel monitoring state, starting from a time slot N + X, and executing a physical downlink control channel monitoring behavior according to the switched physical downlink control channel monitoring state; wherein N, N and X are integers, and X is more than or equal to 1; the downlink control information schedules a bandwidth unit where a physical downlink shared channel is located, and the bandwidth unit is not the same as a currently activated bandwidth unit where the downlink control information is located; and N is a time slot N where the downlink control information is located, and corresponds to a time slot position in a bandwidth unit where a physical downlink shared channel scheduled by the downlink control information is located. By applying the scheme, the monitoring behavior switching of the physical downlink control channel can be realized when the cross-bandwidth unit is scheduled.

Description

Physical downlink control channel monitoring method, user terminal and readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for monitoring a physical downlink control channel, a user terminal, and a readable storage medium.

Background

Battery life of a User terminal (UE) is an important aspect of the User experience, which will affect the use experience of a 5G User terminal or service.

To this end, the 5G system introduces some technical features for indicating a change in the behavior of the ue so that the ue can enter a power saving state under appropriate conditions to save the power of the terminal. The switching of this state involves various configuration changes, including switching of BandWidth units (BWPs) (switching to smaller BWPs), switching of parameters of Physical Downlink Control CHannel (PDCCH) search spaces (e.g. switching a listening period to a larger period), skipping monitoring of Part of PDCCHs (PDCCH monitoring blanking), and cross-slot scheduling (cross-slot scheduling) with a minimum scheduling interval greater than 0.

In the standard technology research of the New air interface (NR) Release 16 version 5G, an energy saving technology based on cross-slot scheduling is completed, and a technology for reducing PDCCH monitoring will be taken as one of the key technologies in the research of the Release 17 version to be developed.

In the currently proposed methods, a change of PDCCH monitoring behavior is indicated based on Downlink Control Information (DCI), such as changing PDCCH monitoring parameters (including a period, a duration, and an offset), skipping PDCCH monitoring (PDCCH blanking duration) for a period of time, and the like. However, there is no solution for when to start executing this indication information after the user terminal receives the DCI with the PDCCH monitoring behavior change.

Disclosure of Invention

The problem to be solved by the present invention is when the user terminal starts to switch the PDCCH monitoring behavior after receiving the DCI with the changed PDCCH monitoring behavior.

In order to solve the above problem, an embodiment of the present invention provides a method for monitoring a physical downlink control channel, where the method includes:

receiving downlink control information at the nth time slot;

when the downlink control information comprises switching indication information of a physical downlink control channel monitoring state, starting from a time slot N + X, and executing a physical downlink control channel monitoring behavior according to the switched physical downlink control channel monitoring state; wherein N, N and X are integers, and X is more than or equal to 1;

the downlink control information schedules a bandwidth unit where a physical downlink shared channel is located, and the bandwidth unit is not the same as a currently activated bandwidth unit where the downlink control information is located; and N is a time slot N where the downlink control information is located, and corresponds to a time slot position in a bandwidth unit where a physical downlink shared channel scheduled by the downlink control information is located.

Optionally, X includes a bandwidth unit switching delay, and N + X is a first time slot after completion of the bandwidth unit switching.

Optionally, X is a scheduling delay used when scheduling the physical downlink shared channel.

Optionally, X is greater than or equal to a transition minimum available scheduling delay, where the transition minimum available scheduling delay is: and switching the minimum available scheduling delay activated and applied in the currently activated downlink bandwidth unit according to the downlink control information and the subcarrier interval of the bandwidth unit in which the physical downlink shared channel is located.

Optionally, X is a larger value of the minimum available scheduling delay for switching and Z, and a value of Z corresponds to a subcarrier interval of a currently activated downlink bandwidth unit in which the downlink control information is located.

Optionally, when the subcarrier intervals of the currently activated downlink bandwidth unit in which the downlink control information is located are 15Khz, 30Khz, 60Khz, and 120Khz, values of Z are sequentially 1, 1, 2, and 2, respectively.

Optionally, the switching indication information of the physical downlink control channel listening state includes at least one of the following:

skipping monitoring of all or part of the physical downlink control channels within a period of time;

and switching parameters of the search space of the physical downlink control channel.

Optionally, the skipping of the monitoring of all or part of the physical downlink control channel within a period of time includes:

and not monitoring the physical downlink control channel in the discontinuous receiving period.

An embodiment of the present invention further provides a user terminal, where the user terminal includes:

a receiving unit, adapted to receive downlink control information DCI at an nth time slot;

a monitoring unit, adapted to execute a monitoring behavior of the physical downlink control channel according to a monitored state of the switched physical downlink control channel from a time slot N + X when the downlink control information includes a switching indication information of the monitored state of the physical downlink control channel; wherein N, N and X are integers, and X is more than or equal to 1;

Optionally, X is a scheduling delay used when scheduling the PDSCH.

Optionally, X takes the larger of the minimum available scheduling delay for the transition and Z; the value of Z corresponds to the subcarrier interval of the currently activated downlink bandwidth unit in which the downlink control information is located.

When the subcarrier intervals of the currently activated downlink bandwidth unit in which the downlink control information is located are 15Khz, 30Khz, 60Khz, and 120Khz, the values of Z are sequentially 1, 1, 2, and 2, respectively.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of any one of the methods described above.

An embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores a computer program capable of being executed on the processor, and the computer program is executed by the processor to implement any of the steps of the method.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

by adopting the scheme, when the bandwidth unit where the physical downlink shared channel is located is scheduled by the downlink control information and the currently activated bandwidth unit where the downlink control information is located is not the same bandwidth unit, the monitoring behavior of the physical downlink control channel is executed from the time slot N + X according to the monitoring state of the switched physical downlink control channel, so that the switching of the monitoring behavior of the physical downlink control channel during the cross-bandwidth unit scheduling can be realized.

Drawings

FIG. 1 is a schematic diagram of a cross-slot scheduling;

fig. 2 is a flowchart of a method for monitoring a physical downlink control channel according to an embodiment of the present invention;

fig. 3 is a diagram of a method of skipping monitoring of all or part of a PDCCH;

fig. 4 is a schematic diagram of not monitoring a physical downlink control channel in the current discontinuous reception period;

fig. 5 is a diagram illustrating a method for determining an execution point for performing a PDCCH monitoring action according to an embodiment of the present invention;

fig. 6 is a diagram illustrating another embodiment of determining an execution point for performing PDCCH monitoring actions;

fig. 7 is a diagram illustrating another embodiment of determining an execution point for performing a PDCCH monitoring action;

fig. 8 is a diagram illustrating another embodiment of determining an execution point for performing a PDCCH monitoring action;

fig. 9 is a schematic structural diagram of a user terminal in an embodiment of the present invention.

Detailed Description

The 5G mobile communication has completed the first release of research in 2018. Based on the first release of the 5G standard, equipment vendors and operators may start the production of equipment and the deployment of 5G networks.

To meet the performance requirements, many new technologies are introduced into the 5G system, such as larger transmission bandwidth, larger subcarrier spacing, smaller processing unit, more antennas, and so on. But the introduction of these technologies has enabled 5G user terminals to increase the energy consumption by several times compared to 4G.

Because the volume of the current user terminal and the battery capacity in the unit volume are not greatly improved, the service life of the battery of the 5G user terminal is difficult to meet the daily use requirement, and the current situation greatly influences the use experience of the user. Therefore, the 3GPP standardization organization establishes a 5G energy saving project (power saving item), and it is expected that a technology for saving the power consumption of the terminal can be excavated, so as to solve the problem of large energy consumption of the 5G terminal. Power saving of the user terminal may be performed from a number of aspects, including content that has been and will be standardized.

The standardized content may include: wake-up signal, restriction of cross-slot scheduling. That is, the standardized contents include: switching of the PDCCH monitoring state, etc.

To facilitate understanding of the following embodiments of the present invention, Cross-slot (Cross-slot) scheduling is briefly described as follows:

cross-slot (Cross-slot) scheduling refers to a time slot in which scheduling information (i.e., DCI) is received, and is not in the same time slot as a Physical Downlink Shared Channel (PDSCH) scheduled by the DCI. In Long Term Evolution (LTE), DCI and a scheduled PDSCH are in the same time slot, and in order to improve scheduling flexibility, the 5G NR may allow the scheduled PDSCH to be located in the last several time slots of the DCI.

The cross-slot scheduling of Release-15 is realized by configuring a Time Domain Resource Allocation (TDRA) table. The TDRA table is an indication table of maximum 16 rows, and as shown in table 1, the first column is a sequence number, i.e., index. The second column is a value of K0, and K0 is the scheduling delay used when scheduling the PDSCH, i.e., the slot interval between the slot receiving DCI and the scheduled PDSCH. For example, when K0 is 1, the PDCCH is in time slot n, and its corresponding PDSCH is in time slot n + 1.

The third column of the TDRA table is a mapping type, a represents a mapping based on a slot (meaning that a slot is a scheduling unit, and the PDCCH is always located on the first 1, 2 or 3 symbols of a slot), and B represents a mapping based on a mini-slot (i-slot) (exponential symbols are a scheduling unit, according to the number of symbols of a mini slot, the starting position of the PDCCH is not limited to the first symbol in the slot, for example, if the length of the mini slot is 7 symbols, then the PDCCH may be located on the first symbol, or may be located on the 8 th symbol).

The fourth column of the TDRA table is a Start and Length Indication Value (SLIV), and the numerical Value of the column indicates the Start symbol position of the PDSCH and the persistent symbol Length of the PDSCH.

Index	K0	Type	SLIV
					0	0	A/B	XXX
1	1	A	56
				2	4	A/B	XXX
3	6	A/B	XXX
				…	…	…	…
15	32	A/B	XXX

TABLE 1

For example, when index is 1, K0 is 1, type is a, and SLIV is 56, the diagram of cross slot scheduling may refer to fig. 1.

From the energy-saving perspective, the cross-slot scheduling can allow the UE to avoid unnecessary PDSCH buffering, and can use a smaller PDCCH reception bandwidth to save terminal energy consumption. However, the situation of equal to 0 and greater than 0 may occur at the same time in K0 in the TDRA table configured in the current cross-slot scheduling, and if K0 is configured to be 0, since the UE does not know whether K0 of the current slot is greater than 0 or equal to 0, the buffer of the PDSCH needs to be kept all the time.

In the new version Release-16, the minimum available scheduling delay (K0min) may be indicated to be greater than 0. The K0 is constantly larger than 0, so that the UE can keep the state of cross-time slot scheduling to save energy. For the indication and switching of K0min, an application delay (application delay) of a new K0min is introduced, and the introduction of the application delay (application delay) mainly takes into account the receiving and processing time of the PDCCH and the adjustment time of the relevant modules. For example, if the current minimum available scheduling delay K0min is 4, that is, the PDSCH scheduled by the DCI is located at the earliest time slot position of DCI slot +4, the UE may relax the DCI processing to 4 time slots, that is, relax the PDCCH from several symbols to the time slot before the PDSCH is located at the earliest time slot. If the DCI is received in slot 0, the decoding is completed before slot 4. Whether or not it can relax to the slot position corresponding to K0min depends on the UE implementation. There are some opportunities to do this level of relaxation when no other processing timeline needs to be met, and the processing of relaxing DCI can reduce the clock frequency and voltage of the processing module, which is very helpful for reducing the power consumption of the UE.

In the currently proposed PDCCH channel monitoring method, a change of PDCCH monitoring behavior is indicated based on Downlink Control Information (DCI), such as changing PDCCH search space parameters (including a period, a duration, and an offset), skipping PDCCH monitoring (PDCCH blanking duration) for a period of time, and the like. However, there is no solution for when to start executing this indication information after the user terminal receives the DCI with the PDCCH monitoring behavior change.

In view of the above problems, an embodiment of the present invention provides a method for monitoring a physical downlink control channel, in the method, when a bandwidth unit where a physical downlink shared channel is scheduled by downlink control information is not the same as a currently activated bandwidth unit where the downlink control information is located, a physical downlink control channel monitoring behavior is executed from a time slot N + X according to a monitored state of a switched physical downlink control channel, so that switching of monitoring behaviors of the physical downlink control channel during cross-bandwidth unit scheduling can be achieved.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 2, an embodiment of the present invention provides a method for monitoring a physical downlink control channel, where the method may include the following steps:

and step 21, receiving the downlink control information in the nth time slot.

In the embodiment of the present invention, a Physical Downlink Shared Channel (PDSCH) scheduled by the DCI is scheduled across BWPs, that is, the BWP where the PDSCH scheduled by the DCI is located is different from the currently activated BWP where the DCI is located. The PDSCH scheduled by the DCI is located in BWP, which can be obtained from the DCI by the UE, that is, indicated by the DCI by the base station.

Step 22, when the downlink control information includes switching indication information of the monitoring state of the physical downlink control channel, starting from the time slot N + X, executing a physical downlink control channel monitoring behavior according to the switched monitoring state of the physical downlink control channel; wherein N, N and X are integers, and X is more than or equal to 1; and N is a time slot N where the downlink control information is located, and corresponds to a time slot position in a bandwidth unit where a physical downlink shared channel scheduled by the downlink control information is located.

In a specific implementation, the DCI may include handover indication information of the PDCCH monitoring state, which is used to instruct the UE to handover the PDCCH monitoring state. Of course, the DCI may not include the switching indication information of the PDCCH monitoring state, and accordingly, the UE does not naturally switch the PDCCH monitoring state.

In an embodiment of the present invention, the PDCCH monitoring state handover indication information may only include: monitoring of all or part of the PDCCH is skipped (PDCCH blanking) for a period of time. The PDCCH monitoring state handover indication information may only include: parameter switching of PDCCH Search Space (SS). The PDCCH monitoring state switching indication information may also include: skipping monitoring of all or part of PDCCH within a period of time, and switching parameters of PDCCH search space.

The skipping of monitoring of all or part of the PDCCH within a period of time means that the UE does not receive and blind-detect the PDCCH within a certain period of time. Taking a PDCCH cycle of 1slot as an example, referring to fig. 3, assuming that the UE receives a PDCCH blanking command in slot n, where the command indicates that a Duration (blanking Duration) for skipping PDCCH monitoring is 3 slots (or indicates an absolute time length, such as 5ms), and an execution time of the command is a next slot (delay is 1slot), the UE will not receive and blind detect the PDCCHs in slots n +1 to n +3, and restart receiving the PDCCH when reaching the n +4 th slot. By the mode, the base station can enable the terminal to enter a dormant state without receiving the PDCCH when no data is scheduled in a short time, so that the electric energy of the terminal is saved.

In an embodiment of the present invention, the skipping of monitoring of all or part of the physical downlink control channel within a period of time may include: and not monitoring the physical downlink control channel in the Discontinuous Reception (DRX) period, wherein the duration of skipping the PDCCH monitoring is the remaining active part of the current DRX period. For example, referring to fig. 4, when receiving PDCCH indication information that is not monitored in the current DRX cycle within a certain time slot in the current DRX cycle, the PDCCH is not monitored in the current DRX cycle, and the monitoring of the PDCCH is started until the starting time slot of the next DRX cycle.

In a specific implementation, the parameter of the PDCCH search space is switched, for example, the search space of the UE before switching is configured as: the period (periodicity) is 20ms, the duration (duration) is 5ms, and the offset (offset) is 5 ms. After handover, the search space of the UE is configured to: the period is 50ms, the monitoring duration is 10ms, and the offset is 0 ms. The UE receives the switching indication in the time slot N, and monitors the PDCCH by the switched search space parameters at the beginning of the time slot N + X.

In a specific implementation, the PDCCH may monitor the status for switching, and may also include not monitoring certain DCI formats, or not monitoring certain control information sets, and so on.

In the embodiment of the present invention, N is a time slot N in which the DCI is located, and corresponds to a time slot position in the BWP in which the PDSCH scheduled by the DCI is located, that is, for the time slot N in which the DCI is located, the time slot N is obtained by converting according to the BWP in which the DCI is located and a Sub-Carrier Space (SCS) of the BWP in which the PDSCH scheduled by the DCI is located.

Assuming that BWP of the DCI is BWP1, the corresponding subcarrier spacing isSCS1, with the sequence number index1 for subcarrier spacing SCS 1. The BWP of PDSCH scheduled by DCI is BWP2, the corresponding subcarrier interval is SCS2, and the serial number of the subcarrier interval SCS2 is index2, then

That is, pair (2)^index2/2^index1) N is rounded down, and the time slot N is the first time on BWP2

And a time slot. When the subcarrier spacing is 15Khz, 30Khz, 60Khz, 120Khz, or 240Khz, the subcarrier spacing sequence numbers are 0, 1, 2, 3, or 4 in this order, that is, index1 and index2 are 0, 1, 2, 3, or 4.

For example, when SCS1 is SCS2 is 15KHZ, if the UE receives DCI at the 2 nd slot on BWP1, N is 2, i.e. the 2 nd slot on BWP1 corresponds to the 2 nd slot on BWP 2. When SCS1 is 15KHZ and SCS2 is 30KHZ, if the UE receives DCI at BWP1 at the 2 nd slot, N is 2, i.e. the 2 nd slot at BWP1 corresponds to the 4 th slot at BWP 2.

In particular implementations, when scheduling PDSCH across BWP, the value of X may be set in a variety of ways.

In an embodiment of the present invention, X includes BWP switching delay, and N + X is the first time slot after completion of switching the bandwidth unit, so that the state switching can be performed without introducing a new start time point, thereby reducing the workload of standardization.

In a specific implementation, the BWP handover delay is a delay required for the UE to switch from the BWP where the DCI is received to the BWP where the PDSCH scheduled by the DCI is located. This is determined by the hardware capabilities of the UE itself. For example, the UE may need 1 timeslot to complete BWP handover, or may need two timeslots to complete BWP handover.

Referring to fig. 5, assuming that DCI is received at the 2 nd slot in bandwidth unit BWP1, where the Duration (skip Duration) indicating that PDCCH monitoring is skipped is 3ms, the scheduling delay K0 used in scheduling the PDSCH is 5, the BWP handover delay is 1slot, the PDSCH scheduled by the DCI is located in bandwidth unit BWP2, and the subcarrier intervals of bandwidth units BWP1 and BWP2 are both 15KHZ, the first slot after BWP handover is completed, that is, slot 4 on bandwidth unit BWP2, may be used as an execution point for performing PDCCH monitoring according to the monitored PDCCH state after handover.

After the execution point is determined, due to the scheduling time delay K0 used when the PDSCH is scheduled, the time slot for the UE to skip the PDCCH monitoring is time slot 4-time slot 6. And according to the indication in the DCI, the time slot for the UE to skip the PDCCH monitoring is from time slot 4 to time slot 6, so that the UE can start at time slot 7 and monitor the PDCCH.

Referring to fig. 6, unlike fig. 5, the PDSCH scheduled by the DCI is located in a bandwidth unit BWP2, the subcarrier spacing of the PDSCH is 30KHZ, and the scheduling delay K0 used in scheduling the PDSCH is 8, and BWP switching completes a slot within slot 7 of BWP2, the first slot after BWP switching is completed, that is, slot 8 on the bandwidth unit BWP2, may be used as an execution point for performing PDCCH monitoring according to the switched PDCCH monitoring state.

After the execution point is determined, due to the scheduling time delay K0 used when the PDSCH is scheduled, the time slot for the UE to skip the PDCCH monitoring is from 8 to 11. And according to the indication in the DCI, the time slot for skipping PDCCH monitoring by the UE is from time slot 8 to time slot 13, so that the UE can monitor the PDCCH starting at time slot 12.

In another embodiment of the present invention, X may be a scheduling delay K0 used when scheduling the PDSCH, that is, the UE performs a PDCCH monitoring action according to the PDCCH monitoring state after the handover from the time slot N + K0, thereby further increasing the flexibility of PDCCH state handover.

For example, the base station only needs to do no PDCCH monitoring for a short period of time, and the base station may indicate a smaller K0 while no skip ping (skipping PDCCH monitoring) is indicated in DCI. If a longer time is needed to avoid PDCCH clipping, the base station may choose a larger K0 without indicating clipping in the DCI. If it is also desired to refrain from skiping for a longer period of time, the base station may choose a larger K0 with skiping indicated in the DCI. That cropping has a length of K0+ cropping duration indicated by DCI

Referring to fig. 7, assuming that DCI is received at the 2 nd slot in bandwidth unit BWP1, where the Duration (skip Duration) indicating that PDCCH monitoring is skipped is 3ms, the scheduling delay K0 used in scheduling the PDSCH is 8, BWP switching is completed in slot 7, the PDSCH scheduled by the DCI is located in bandwidth unit BWP2, the subcarrier spacing of bandwidth unit BWP1 is 15KHZ, and the subcarrier spacing of bandwidth unit BWP2 is 30KHZ, then slot (4+8) in bandwidth unit BWP2 may be used as an execution point for performing PDCCH monitoring behavior according to the PDCCH monitoring state after switching.

After the execution point is determined, due to the scheduling time delay K0 used when the PDSCH is scheduled, the time slot for the UE to skip the PDCCH monitoring is from 8 to 11. However, according to the indication in the DCI, the UE skips the PDCCH monitoring in the time slots 12 to 17, so that the UE can monitor the PDCCH starting in the time slot 18.

It should be noted that, according to the current protocol, in the cross BWP scheduling process, the UE does not need to perform any transceiving operation from the fourth symbol indicating the slot where the DCI scheduled across BWP is located to before the boundary of the slot where the PDSCH scheduled across BWP is located, i.e. in the figure, the UE does not need to listen to the PDCCH in slot 4 to slot 11 of BWP 2. Thus, when the execution time point is in the slot where the data scheduled across BWP is located, the actual length for skipping PDCCH monitoring is K0+ blanking duration, i.e., slot 8 to slot 17.

In another embodiment of the present invention, X is greater than or equal to a transition minimum available scheduling delay, K0min1, said transition minimum available scheduling delay being: the minimum available scheduling delay K0min activated and applied in the currently activated downlink bandwidth unit is obtained according to the downlink control information and the subcarrier interval conversion of the bandwidth unit where the physical downlink shared channel is located, so that the starting point can be determined by using the currently activated minimum available scheduling delay K0min, and the terminal has a chance to relax the processing of the PDCCH according to the minimum available scheduling delay K0 min. .

Specifically, the time slot n for receiving the DCI is converted to obtain the PDSCH scheduled by the corresponding DCISimilarly, in the timeslot N on BWP, it is assumed that the BWP where the DCI is located is BWP1, the corresponding subcarrier spacing is SCS1, and the sequence number of the subcarrier spacing SCS1 is index 1. The BWP of PDSCH scheduled by DCI is BWP2, the corresponding subcarrier interval is SCS2, and the serial number of the subcarrier interval SCS2 is index2, then

That is, pair (2)^index2/2^index1) K0min rounded up. When the subcarrier spacing is 15Khz, 30Khz, 60Khz, or 120Khz, the subcarrier spacing numbers are 0, 1, 2, or 3 in this order, that is, index1 and index2 are 0, 1, 2, or 3.

For example, when SCS1 is SCS2 is 15KHZ, if minimum available scheduling delay K0min is 3 on BWP1, then minimum available scheduling delay K0min1 is also 3 on BWP 2. When SCS1 is 15KHZ and SCS2 is 30KHZ, if the minimum available scheduling delay K0min is 3 at BWP1, then the minimum available scheduling delay K0min1 is 6 at BWP 2.

Preferably, X may take the larger of the transition minimum available scheduling delay and Z, i.e., X Max (K0min1, Z). And the value of Z corresponds to the subcarrier interval of the currently activated downlink BWP where the DCI is positioned. And when the subcarrier intervals of the currently activated downlink bandwidth unit in which the DCI is located are 15Khz, 30Khz, 60Khz and 120Khz, the values of Z are 1, 1, 2 and 2 in sequence respectively.

Referring to fig. 8, it is assumed that DCI is received at 2 nd slot in bandwidth unit BWP1, where a Duration (skip Duration) indicating that PDCCH monitoring is skipped is 3ms, a scheduling delay K0 used in scheduling the PDSCH is 8, BWP switching is completed in slot 7, the PDSCH scheduled by the DCI is located in bandwidth unit BWP2, a subcarrier interval of bandwidth unit BWP1 is 15KHZ, and a subcarrier interval of bandwidth unit BWP2 is 30 KHZ. Since the minimum available scheduling delay K0min is 3 in the bandwidth unit BWP1, the bandwidth unit BWP2 converts the minimum available scheduling delay K0min1 to 6, and therefore the (4+6) th slot in BWP2 is used as the execution point for performing the PDCCH monitoring action according to the switched PDCCH monitoring status.

After the execution point is determined, due to the scheduling time delay K0 used when the PDSCH is scheduled, the time slot for the UE to skip the PDCCH monitoring is from 8 to 11. And according to the indication in the DCI, the time slot for the UE to skip the PDCCH monitoring is from time slot 10 to time slot 15, so that the UE can start at time slot 16 and monitor the PDCCH.

It can be understood that in the specific implementation, as long as X is greater than or equal to K0min1, the terminal does not need to finish PDCCH decoding within several symbols, and the processing of the PDCCH can still be relaxed according to the time scale of K0min1, thereby saving energy consumption.

As can be seen from the above, in the method for monitoring a PDCCH in the embodiment of the present invention, when scheduling across BWPs, starting from the timeslot N + X on the BWP where the PDSCH scheduled by DCI is located, a monitoring behavior of the PDCCH is executed according to a monitored state of the switched PDCCH, so as to implement switching of the monitoring behavior of the PDCCH when scheduling across BWPs.

In order to make the present invention better understood and realized by those skilled in the art, the following detailed description is provided for a device and a computer readable storage medium corresponding to the above method.

Referring to fig. 9, an embodiment of the present invention further provides a user terminal 90, where the user terminal 90 may include: a receiving unit 91 and a listening unit 92. Wherein:

the receiving unit 91 is adapted to receive downlink control information DCI at an nth time slot;

the monitoring unit 92 is adapted to, when the downlink control information includes switching indication information of a physical downlink control channel monitoring state, perform, starting from the time slot N + X, a physical downlink control channel monitoring behavior according to the switched physical downlink control channel monitoring state; wherein N, N and X are integers, and X is more than or equal to 1;

In an embodiment of the present invention, X includes a bandwidth unit switching delay, and N + X is a first time slot after completion of the bandwidth unit switching.

In an embodiment of the present invention, X is a scheduling delay used when scheduling the PDSCH.

In an embodiment of the present invention, X is greater than or equal to a transition minimum available scheduling delay, where the transition minimum available scheduling delay is: and switching the minimum available scheduling delay activated and applied in the currently activated downlink bandwidth unit according to the downlink control information and the subcarrier interval of the bandwidth unit in which the physical downlink shared channel is located.

In one embodiment of the invention, X takes the larger of the minimum available scheduling delay for the transition and Z; the value of Z corresponds to the subcarrier interval of the currently activated downlink bandwidth unit in which the downlink control information is located.

In an embodiment of the present invention, when the subcarrier intervals of the currently activated downlink bandwidth unit in which the downlink control information is located are 15Khz, 30Khz, 60Khz, and 120Khz, values of Z are sequentially 1, 1, 2, and 2, respectively.

In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

An embodiment of the present invention further provides a user terminal, including a memory and a processor, where the memory stores thereon a computer program executable on the processor, and the computer program is executed by the processor to implement the steps of any one of the methods described above.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for monitoring a Physical Downlink Control Channel (PDCCH) is characterized by comprising the following steps:

receiving downlink control information at the nth time slot;

2. The method as claimed in claim 1, wherein X includes a bandwidth unit switching delay, and N + X is a first time slot after completion of the bandwidth unit switching.

3. The method as claimed in claim 1, wherein X is a scheduling delay used when scheduling the physical downlink shared channel.

4. The method for monitoring physical downlink control channel according to claim 1, wherein X is greater than or equal to a minimum available scheduling delay for switching, and the minimum available scheduling delay for switching is: and switching the minimum available scheduling delay activated and applied in the currently activated downlink bandwidth unit according to the downlink control information and the subcarrier interval of the bandwidth unit in which the physical downlink shared channel is located.

5. The physical downlink control channel monitoring method according to claim 4, wherein X is a larger value of the minimum available scheduling delay for switching and Z, and the value of Z corresponds to a subcarrier interval of a currently activated downlink bandwidth unit in which the downlink control information is located.

6. The method according to claim 5, wherein when the subcarrier spacing of the currently activated downlink bandwidth unit in which the downlink control information is located is 15Khz, 30Khz, 60Khz, and 120Khz, the values of Z are sequentially 1, 1, 2, and 2, respectively.

7. The method for monitoring the physical downlink control channel according to claim 1, wherein the handover indication information of the monitored state of the physical downlink control channel includes at least one of:

8. The method for monitoring the physical downlink control channel according to claim 7, wherein the skipping of monitoring of all or part of the physical downlink control channel during a period of time includes:

9. A user terminal, comprising:

10. The user terminal of claim 9, wherein X comprises a bandwidth unit switch delay and N + X is the first slot after completion of the bandwidth unit switch.

11. The user terminal of claim 9, wherein X is a scheduling delay used in scheduling the PDSCH.

12. The user terminal of claim 9, wherein X is greater than or equal to a transition minimum available scheduling delay, the transition minimum available scheduling delay being: and switching the minimum available scheduling delay activated and applied in the currently activated downlink bandwidth unit according to the downlink control information and the subcarrier interval of the bandwidth unit in which the physical downlink shared channel is located.

13. The user terminal of claim 12, wherein X takes the larger of the transition minimum available scheduling delay and Z; the value of Z corresponds to the subcarrier interval of the currently activated downlink bandwidth unit in which the downlink control information is located.

14. The ue of claim 13, wherein when the subcarrier spacing of the currently activated downlink bandwidth unit in which the downlink control information is located is 15Khz, 30Khz, 60Khz, and 120Khz, the values of Z are sequentially 1, 1, 2, and 2, respectively.

15. A computer-readable storage medium, on which a computer program is stored, which computer program is executable by a processor for carrying out the steps of the method according to any one of claims 1 to 8.

16. A user terminal comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, wherein the computer program is executed by the processor to perform the steps of the method according to any one of claims 1 to 8.