CN110830206B

CN110830206B - PDCCH (physical Downlink control channel) determination and synchronization signal detection and transmission methods and devices, storage medium, terminal and base station

Info

Publication number: CN110830206B
Application number: CN201810909962.7A
Authority: CN
Inventors: 周化雨; 徐志昆; 高兴航; 黄甦; 周欢
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2022-03-29
Anticipated expiration: 2038-08-10
Also published as: CN110830206A

Abstract

A PDCCH (physical Downlink control channel) determining and synchronous signal detecting and sending method and device, a storage medium, a terminal and a base station are provided, wherein the determining method comprises the following steps: after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal has a preset incidence relation with the PDCCH monitoring opportunity; and determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion. By the technical scheme of the invention, the UE can be effectively prevented from blindly detecting the PDCCH, the power consumption is saved, the blind detection complexity is reduced, and the user experience is improved.

Description

PDCCH (physical Downlink control channel) determination and synchronization signal detection and transmission methods and devices, storage medium, terminal and base station

Technical Field

The invention relates to the technical field of wireless communication, in particular to a method and a device for determining a PDCCH (physical Downlink control channel), detecting and sending a synchronization signal, a storage medium, a terminal and a base station.

Background

New Radio (NR) systems will be deployed in The future for The Fifth Generation mobile communications (5G). In the NR system, in order to save power consumption of a User Equipment (UE), the UE may enter a sleep state.

In practical applications, for the purpose of saving power, the UE in the sleep state may not receive network paging or other messages. The network may send a paging message or the like to the UE after waking up to resume communication between the network and the UE. However, since the UE in the sleep state may be out of synchronization with the network, even if the UE wakes up, the UE still cannot be synchronized with the network quickly and timely, which reduces user experience. If a certain Synchronization Signal (Synchronization Signal) is added to the NR system, the Synchronization speed will be increased and the Synchronization efficiency will be improved.

At present, how to determine a PDCCH monitoring occasion by using a synchronization signal to reduce the PDCCH blind detection complexity and reduce the terminal power consumption is one of the technical problems to be solved by a wireless communication system.

Disclosure of Invention

The technical problem to be solved by the invention is how to determine the PDCCH monitoring opportunity by using the synchronization signal so as to reduce the complexity of blind detection of the PDCCH, reduce the power consumption of the terminal and improve the user experience.

To solve the foregoing technical problem, an embodiment of the present invention provides a method for detecting a synchronization signal and determining a PDCCH, where the method includes: after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal has a preset incidence relation with the PDCCH monitoring opportunity; and determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion.

Optionally, the time domain resource used by the synchronization signal does not exceed 4 OFDM symbols, and the total overhead of the time frequency resource does not exceed 48 PRB.

Optionally, the time domain resource used by the synchronization signal is 4 OFDM symbols, where the 4 OFDM symbols start from the 3 rd, 7 th, or 11 th OFDM symbol in the time slot; or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, the time domain resource used by the synchronization signal group is 4 OFDM symbols, the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB, and the synchronization signal group is determined according to two consecutive synchronization signals; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, where the 2 OFDM symbols start at the 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, or 13 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

Optionally, the total overhead of time-frequency resources of the synchronization signal is 24 PRBs, where the frequency-domain resources used by the synchronization signal are 6 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 1 OFDM symbol.

Optionally, the time-frequency resources of the synchronization signal are 48 PRBs, where the frequency-domain resources used by the synchronization signal are 12 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 48 PRBs, and the time domain resource is 1 OFDM symbol.

Optionally, the synchronization signal is transmitted periodically, and the detecting the synchronization signal sent by the network after the wake-up includes: and after waking up, detecting the synchronous signal sent by the network every preset period.

Optionally, the synchronization signal is transmitted non-periodically, and the detecting the synchronization signal sent by the network after the wake-up includes: after waking up, determining a time interval between a wake-up time and a paging occasion; judging whether a synchronous signal block can be received in the time interval; and when the judgment result shows that the synchronous signal block cannot be received, detecting the synchronous signal sent by the network in the time interval.

Optionally, the network configures a maximum duration for transmitting the synchronization signal, and the synchronization signal is repeatedly transmitted within the maximum duration.

Optionally, the parameter set of the synchronization signal uses a parameter set of BWP or uses a parameter set of a synchronization signal block.

Optionally, the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

Optionally, the synchronization signal includes system update indication information.

In order to solve the above technical problem, an embodiment of the present invention further provides a method for sending a synchronization signal and a PDCCH, where the method includes: sending the synchronization signal to user equipment so that the user equipment detects the synchronization signal after awakening and realizes network synchronization again according to the synchronization signal, wherein the synchronization signal has a preset association relation with the PDCCH monitoring opportunity; and determining a PDCCH monitoring opportunity according to the preset incidence relation, and sending the PDCCH at the PDCCH monitoring opportunity.

Optionally, the total overhead of time-frequency resources of the synchronization signal is 48 PRBs, where the frequency-domain resources used by the synchronization signal are 12 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal occupies 48 PRBs, and the time domain resource is 1 OFDM symbol.

Optionally, the synchronization signal is periodically transmitted, and the transmitting the synchronization signal to the user equipment includes: and sending the synchronous signal to the user equipment at intervals of a preset period.

Optionally, the synchronization signal is transmitted non-periodically, and the transmitting the synchronization signal to the user equipment includes: determining a time interval between the wake-up time and a paging occasion; judging whether the sending opportunity of the synchronous signal block is in the time interval or not; and when the judgment result shows that the sending opportunity of the synchronous signal block is not in the time interval, sending the synchronous signal to the user equipment in the time interval.

Optionally, the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

To solve the foregoing technical problem, an embodiment of the present invention further provides a synchronization signal detection and PDCCH determination apparatus, where the apparatus includes: the first detection module is suitable for detecting a synchronization signal sent by a network after awakening so as to realize network synchronization again, and the synchronization signal and the PDCCH monitoring opportunity have a preset association relationship; and the second detection module is suitable for determining the PDCCH monitoring occasion according to the preset incidence relation and detecting the PDCCH at the PDCCH monitoring occasion.

To solve the above technical problem, an embodiment of the present invention further provides a device for transmitting a synchronization signal and a PDCCH, where the device includes: the first sending module is suitable for sending the synchronization signal to user equipment so that the user equipment detects the synchronization signal after awakening and realizes network synchronization again according to the synchronization signal, and the synchronization signal and the PDCCH monitoring opportunity have a preset association relation; and the second sending module is suitable for determining the PDCCH monitoring opportunity according to the preset incidence relation and sending the PDCCH at the PDCCH monitoring opportunity.

In order to solve the above technical problem, an embodiment of the present invention further provides a storage medium, on which computer instructions are stored, and the computer instructions execute the steps of the above synchronization signal detection and PDCCH determination method and synchronization signal and PDCCH transmission method when running.

In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the steps of the above method for determining a synchronization signal detection PDCCH when executing the computer instructions.

In order to solve the above technical problem, an embodiment of the present invention further provides a base station, including a memory and a processor, where the memory stores a computer instruction executable on the processor, and the processor executes the steps of the synchronization signal and the PDCCH sending method when executing the computer instruction.

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

the embodiment of the invention provides a method for detecting a synchronous signal and determining a PDCCH (physical downlink control channel), which comprises the following steps: after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal has a preset incidence relation with the PDCCH monitoring opportunity; and determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion. According to the technical scheme provided by the embodiment of the invention, the preset incidence relation is established for the synchronous signal and the PDCCH monitoring opportunity, so that the UE can complete network synchronization after awakening, the PDCCH monitoring opportunity is determined based on the preset incidence relation, and the PDCCH is detected at the PDCCH monitoring opportunity, thereby effectively avoiding the UE from blindly detecting the PDCCH, saving power consumption, reducing the PDCCH blindly detecting complexity and improving user experience.

Further, the time domain resources used by the synchronization signal do not exceed 4 OFDM symbols, and the total overhead of the time frequency resources does not exceed 48 PRB. By the technical scheme provided by the embodiment of the invention, the synchronization signal can be optimized, and the time-frequency resource occupied by the synchronization signal is reduced, so that the compatibility problem of the synchronization signal and an NR system or other wireless systems is effectively solved, and the network synchronization is quickly completed.

Further, the synchronization signal is transmitted non-periodically, and the detecting the synchronization signal sent by the network after the wake-up comprises: after waking up, determining a time interval between a wake-up time and a paging occasion; judging whether a synchronous signal block can be received in the time interval; and when the judgment result shows that the synchronous signal block cannot be received, detecting the synchronous signal sent by the network in the time interval. By the technical scheme provided by the embodiment of the invention, the UE after awakening can quickly finish beam training and time-frequency synchronization.

Drawings

Fig. 1 is a flowchart illustrating a synchronization signal detection and PDCCH determination method according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for transmitting a synchronization signal and a PDCCH according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a synchronization signal detection and PDCCH determination apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a device for transmitting a synchronization signal and a PDCCH according to an embodiment of the present invention;

FIG. 5 is a signaling interaction diagram of an exemplary application scenario according to an embodiment of the present invention;

fig. 6 is a signaling interaction diagram of another exemplary application scenario according to an embodiment of the present invention.

Detailed Description

As background art shows, in the prior art, there is no technical solution for determining a PDCCH monitoring occasion by using a synchronization signal.

Specifically, in the NR system, a Synchronization Signal and a broadcast channel Signal are transmitted in the form of a Synchronization Signal Block (SSB), and a function such as beam scanning (beam scanning) is introduced in the 5G system. Each synchronization signal block can be regarded as a resource corresponding to one beam in the beam scanning process. The Synchronization Signal block includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). A plurality of synchronization signal blocks constitute a synchronization signal burst (synchronization signal burst). The synchronization signal burst can be viewed as a relatively centralized resource of a block containing multiple beams. The plurality of synchronization signal bursts form a set of synchronization signal bursts (sync signal burst set). The synchronization signal block is repeatedly transmitted on different beams to complete the beam scanning process. Through the training of the beam scanning, the user equipment can determine on which beam the signal received is strongest.

For example, it can be assumed that the time domain positions of the L synchronization signal blocks within a 5 millisecond (ms) window are fixed. That is, the transmission time instant of the synchronization signal block within the 5ms window is fixed, as is the index. Wherein the indexes of the L synchronous signal blocks are arranged consecutively in time domain positions from 0 to (L-1), L being a positive integer.

Further, a new concept of "Bandwidth Part (BWP)" is introduced into the NR system, allowing the NR UE to access the 5G system using narrowband BWP and transmit the service using broadband BWP. For NR systems, a Cell (e.g., Primary Cell, PCell Cell for short) may contain multiple BWPs, each occupying a limited bandwidth.

Further, the base station may configure a Control Resource Set (CORESET) and a Search space Set (Search space Set) for BWP. The CORESET includes information such as a frequency domain Resource position, a time domain symbol number, and a Control Channel Element (CCE) and a Resource Element Group (REG) (i.e., CCE-to-REG) mapping of a Physical Downlink Control Channel (PDCCH) monitored by the UE. The search space set comprises information such as a slot cycle of a PDCCH monitored by user equipment, a starting symbol position and an aggregation level in a slot. A set of search spaces will bind a set of control resources. And determining a group of time-frequency resources by the search space set and the control resource set bound by the search space set, and performing blind detection on the PDCCH by the UE in the time-frequency resources. There are two types of search space collections: a Common search space (or a Common search space set) and a UE specific search space (or a UE specific search space set). In the search space set, the UE may perform blind detection on the PDCCH according to a preset rule, and detect Downlink Control Information (DCI) belonging to the UE according to a Radio Network Temporary Identifier (RNTI). Data may then be received or uploaded according to the DCI.

The Remaining Minimum System Information (RMSI) corresponds to a System message Block 1 (SIB 1) in a Long Term Evolution (Long Term Evolution) System. The RMSI includes other main system Information in addition to a main system Information Block (MIB). The RMSI is carried on a Physical Downlink Shared CHannel (PDSCH), and the PDSCH is scheduled through the PDCCH. The PDSCH carrying RMSI is commonly referred to as RMSIPDSCH and the PDCCH of schedule RMSI PDSCH is commonly referred to as RMSI PDCCH.

Further, the UE may monitor for wake-up indications during the sleep state. When the UE monitors the awakening indication, the UE may be out of step with the network, so that the UE can only blindly detect the PDCCH corresponding to the system message before receiving the system message, the power consumption of the UE and the blind detection complexity of the PDCCH are increased, and the improvement of user experience is not facilitated.

To solve the foregoing technical problem, an embodiment of the present invention provides a method for determining a PDCCH, including: after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal has a preset incidence relation with the PDCCH monitoring opportunity; and determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion. According to the technical scheme provided by the embodiment of the invention, the preset incidence relation is established for the synchronous signal and the PDCCH monitoring opportunity, so that the UE can complete network synchronization after awakening, the PDCCH monitoring opportunity is determined based on the preset incidence relation, and the PDCCH is detected at the PDCCH monitoring opportunity, thereby effectively avoiding the UE from blindly detecting the PDCCH, saving power consumption, reducing the blind detection complexity and improving the user experience.

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

Fig. 1 is a flowchart illustrating a method for determining a PDCCH according to an embodiment of the present invention. The determination method may be applied to the user equipment side, for example, performed by the UE. Specifically, the determination method may include the steps of:

step S101, after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal and a PDCCH monitoring opportunity have a preset association relationship;

step S102, determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion.

In particular implementations, the UE may wake up from a sleep state based on the wake-up indication. The wake-up indication may be carried in the synchronization signal or in a signal different from the synchronization signal. When the wake-up indication is carried in the synchronization signal, the synchronization signal may also be referred to as a wake-up signal, or as a synchronization signal with a wake-up function. The synchronization signal may be a signal different from the synchronization signal block, which needs to be periodically detected by the UE, and may be used for resynchronization after the UE wakes up from a sleep state, or may be used for waking up the UE, and so on. The synchronization signal may be considered as a supplement to the SSB signal to enable the UE to maintain synchronization with the network during the sleep state, or to enable the UE to quickly complete network synchronization after waking up from the sleep state.

It should be noted that, in this document, the synchronization signals are all signals other than SSB, unless otherwise specified.

Generally, the UE needs to periodically monitor the paging PDCCH to acquire a paging message or a system information update indication. In some scenarios (e.g., low mobility scenarios), the UE may detect the wake-up indication before a corresponding Paging Occasion (PO). If the wake-up indication is detected, the UE may wake up and blind-detect a paging PDCCH at the corresponding PO. And if the wake-up indication is not detected, the sleep state is continuously kept, so that the purpose of saving power consumption is achieved. If no wake-up indication is detected, the UE is in a sleep state, and time-frequency synchronization is no longer required to be performed "frequently" to save power consumption.

In step S101, the UE may detect a synchronization signal transmitted by the network after waking up to achieve network synchronization again. The synchronization signal may have a preset association relationship with a PDCCH monitoring occasion, that is, the synchronization signal has a time-frequency synchronization and beam training function, and is also associated with the PDCCH. The UE may obtain a PDCCH monitoring occasion to be detected by detecting the synchronization signal.

Further, a parameter set (numerology) of the synchronization signal may use a parameter set of BWP or use a parameter set of a synchronization signal block. For example, the parameter set of the time-frequency resource occupied by the symbol on the time-domain resource of the wake-up signal may be the same as the parameter set of the time-frequency resource occupied by the symbol on the BWP where the UE is located. Alternatively, the parameter set of the time-frequency resources occupied by the symbols on the time-domain resources of the synchronization signal may use the parameter set of the time-frequency resources occupied by the synchronization signal block.

The base station may determine the time-frequency resource occupied by the synchronization signal according to its own state or protocol specification. The base station may configure a maximum duration for transmitting the synchronization signal, the synchronization signal being repeatedly received within the maximum duration.

Further, the synchronization signal may be sent periodically, and the UE may detect the synchronization signal sent by the network at preset intervals, so as to keep the UE synchronized with the network. As a non-limiting example, the transmission period of the synchronization signal may be much longer than the transmission period of the SSB, e.g., 200 ms. Those skilled in the art understand that, in specific implementation, the sending period may be changed into more embodiments according to actual requirements, and details are not described here.

As a variation, the synchronization signal may also be transmitted non-periodically. At this time, the UE may calculate a time interval between the wake-up time and the paging occasion after the wake-up, and if the SSB can be received within the time interval (for example, the SSB transmission cycle is exactly in the time interval), the UE may not detect the synchronization signal but detect the SSB within the time interval to achieve network synchronization. Conversely, if the SSB cannot be received within the time interval (e.g., the SSB transmission period happens not to be within the time interval), the UE may detect the synchronization signal within the time interval to achieve network synchronization.

As a non-limiting example, the synchronization signal may include system information update indication information. Once the UE detects the synchronization signal, network synchronization may be completed, and if System Information update indication Information is found, according to the preset association relationship, detection RMSI PDCCH and/or Other System Information (OSI) PDCCH, and reception RMSI PDSCH and/or OSI PDSCH may be performed, which greatly shortens the time for receiving RMSI and/or OSI.

Further, in a specific implementation, the time domain resources used by the synchronization signal may not exceed 4 OFDM symbols, and the total overhead of the time frequency resources may not exceed 48 PRBs.

As a non-limiting example, the time domain resource used by the synchronization signal may be 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols, where the 4 OFDM symbols start from the 3 rd, 7 th or 11 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB. Or, the time domain resource used by the synchronization signal is 2 OFDM symbols, and the synchronization signal may be transmitted in the form of a synchronization signal group when being transmitted. The synchronization signal group is determined by 2 continuous synchronization signals occupying 2 OFDM symbols; the time domain resource used by the synchronization signal group may be 4 OFDM symbols, and the starting time domain positions of the 4 OFDM symbols are consistent with the starting time domain position of the MIB-configured SSB.

Alternatively, the time domain resource used by the synchronization signal may be 2 OFDM symbols, where the 2 OFDM symbols start at 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th or 13 th OFDM symbols in a slot; or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

As a non-limiting example, the total overhead of time-frequency resources of the synchronization signal may be 24 PRBs, where the frequency-domain resources used by the synchronization signal are 6 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 1 OFDM symbol.

As a variation, the time-frequency resource of the synchronization signal may be 48 PRBs, where the frequency-domain resource used by the synchronization signal is 12 PRBs, and the time-domain resource is 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 48 PRBs, and the time domain resource is 1 OFDM symbol.

In step S102, after the UE successfully detects the synchronization signal, the UE can quickly know the PDCCH monitoring occasion of paging, RMSI and/or OSI according to the preset association relationship. Thereafter, the UE may detect the PDCCH at the PDCCH monitoring occasion.

Fig. 2 is a flowchart illustrating a method for transmitting a PDCCH according to an embodiment of the present invention. The sending method of the PDCCH can be applied to a network side. For example, by a base station on the network side.

Specifically, the method for transmitting the PDCCH may include the steps of:

step S201, sending the synchronization signal to user equipment, so that the user equipment detects the synchronization signal after awakening and realizes network synchronization again according to the synchronization signal, wherein the synchronization signal has a preset association relation with PDCCH monitoring opportunity;

step S202, determining a PDCCH monitoring opportunity according to the preset incidence relation, and sending the PDCCH at the PDCCH monitoring opportunity.

Specifically, in step S201, the network may determine a synchronization signal and transmit the synchronization signal to the UE. After the UE wakes up, the UE may detect the synchronization signal and re-implement network synchronization according to the synchronization signal.

As a non-limiting example, the synchronization signal may be transmitted periodically, and the base station may transmit the synchronization signal to the UE every preset period.

As a variation, the synchronization signal may be sent non-periodically, and the base station may determine a time point of the wake-up time and the paging occasion, and then determine a time interval between the wake-up time and the paging occasion; judging whether the sending opportunity of the SSB is in the time interval or not; when the determination result indicates that the transmission timing of the synchronization signal block is not within the time interval, the base station may transmit the synchronization signal to the user equipment within the time interval.

The synchronization signal and the PDCCH monitoring opportunity have a preset association relationship. And the synchronization signal may include system update indication information.

In step S202, the network may determine a PDCCH monitoring occasion according to the preset association relationship, and send the PDCCH to the UE at the PDCCH monitoring occasion, so that the UE can quickly detect the PDCCH, and reduce the blind detection complexity of the PDCCH.

Wherein the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

Further, the network may configure a maximum duration for transmitting the synchronization signal, the synchronization signal being repeatedly transmitted within the maximum duration.

It should be noted that the parameter set of the synchronization signal may use a parameter set of BWP or use a parameter set of the synchronization signal block.

Further, the time domain resources used by the synchronization signal may not exceed 4 OFDM symbols, and the total overhead of the time frequency resources may not exceed 48 PRB.

In specific implementation, the time domain resource used by the synchronization signal may be 4 OFDM symbols, where the 4 OFDM symbols start from the 3 rd, 7 th, or 11 th OFDM symbol in a slot; or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, the time domain resource used by the synchronization signal group is 4 OFDM symbols, the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB, and the synchronization signal group is determined according to two consecutive synchronization signals; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, where the 2 OFDM symbols start at the 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, or 13 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

Further, the total overhead of time-frequency resources of the synchronization signal may be 24 PRBs, where the frequency-domain resources used by the synchronization signal are 6 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 1 OFDM symbol.

As a variation, the total time-frequency resource overhead of the synchronization signal may be 48 PRBs, where the frequency-domain resource used by the synchronization signal is 12 PRBs, and the time-domain resource is 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal occupies 48 PRBs, and the time domain resource is 1 OFDM symbol.

Therefore, by the technical scheme provided by the embodiment of the invention, the UE can be effectively prevented from blindly detecting the PDCCH, the power consumption is saved, the PDCCH blind detection complexity is reduced, and the user experience is improved. Furthermore, the synchronization signal provided by the embodiment of the invention occupies smaller time-frequency resources, can effectively solve the problem of compatibility of the synchronization signal with an NR system or other wireless systems, and can quickly complete network synchronization.

Those skilled in the art understand that the steps S201 to S202 can be regarded as execution steps corresponding to the steps S101 to S102 described in the above embodiment shown in fig. 1, and the two steps are complementary in specific implementation principle and logic. Therefore, for the explanation of the terms involved in the present embodiment, reference may be made to the description related to the embodiment shown in fig. 1, and the description is not repeated here.

Fig. 3 is a schematic structural diagram of a PDCCH determination apparatus according to an embodiment of the present invention. The PDCCH determining apparatus 3 (hereinafter referred to as determining apparatus 3) may be applied to a user equipment side, for example, executed by a UE, and those skilled in the art understand that the embodiment of the present invention may be used to implement the technical solution of the PDCCH determining method shown in fig. 1.

Specifically, the determination means 3 may include: a first detection module 31 and a second detection module 32.

More specifically, the first detection module 31 is adapted to detect a synchronization signal sent by the network after waking up, so as to achieve network synchronization again, where the synchronization signal has a preset association relationship with a PDCCH monitoring occasion; the second detecting module 32 is adapted to determine a PDCCH monitoring occasion according to the preset association relationship and detect the PDCCH at the PDCCH monitoring occasion. Wherein the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

In a specific implementation, the time domain resources used by the synchronization signal do not exceed 4 OFDM symbols, and the total overhead of the time frequency resources does not exceed 48 PRBs.

As a non-limiting example, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the 4 OFDM symbols start from the 3 rd, 7 th or 11 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, the time domain resource used by the synchronization signal group is 4 OFDM symbols, the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB, and the synchronization signal group is determined according to two consecutive synchronization signals; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, where the 2 OFDM symbols start at the 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, or 13 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

As a further non-limiting example, the total overhead of time-frequency resources of the synchronization signal may be 24 PRBs, where the frequency-domain resources used by the synchronization signal are 6 PRBs, and the time-domain resources are 4 or 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 2 OFDM symbols; or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 1 OFDM symbol.

Further, the synchronization signal is transmitted periodically, and the first detecting module 31 may include: the first detection submodule 311 is adapted to detect the synchronization signal sent by the network every preset period.

As a variation, the synchronization signal is transmitted non-periodically, and the first detecting module 31 may include: a determining submodule 312 adapted to determine, after waking up, a time interval between a wake-up time and a paging occasion; a determining submodule 313 adapted to determine whether a synchronization signal block can be received within the time interval; and the second detection sub-module 314 is adapted to detect the synchronization signal sent by the network in the time interval when the determination result indicates that the synchronization signal block cannot be received.

Wherein the parameter set of the synchronization signal may use a parameter set of BWP or use a parameter set of a synchronization signal block. The synchronization signal may include system update indication information.

For more details of the operation principle and the operation mode of the determining device 3, reference may be made to the related description in fig. 1, and details are not repeated here.

Fig. 4 shows a PDCCH transmission apparatus according to an embodiment of the present invention. The sending apparatus 4 of PDCCH (hereinafter referred to as sending apparatus 4 for simplicity) may be applied to a network side, for example, executed by a base station on the network side, and those skilled in the art understand that the embodiment of the present invention may be used to implement the technical solution of the method shown in fig. 2.

Specifically, the transmission device 4 may include: a first transmission module 41 and a second transmission module 42.

More specifically, the first sending module 41 is adapted to send the synchronization signal to the ue, so that the ue detects the synchronization signal after waking up and achieves network synchronization again according to the synchronization signal, where the synchronization signal has a preset association relationship with a PDCCH monitoring occasion; the second sending module 42 is adapted to determine a PDCCH monitoring occasion according to the preset association relationship, and send the PDCCH at the PDCCH monitoring occasion. Wherein the PDCCH refers to RMSI PDCCH or OSIPDCCH or paging PDCCH.

Further, the time domain resources used by the synchronization signal do not exceed 4 OFDM symbols, and the total overhead of the time frequency resources does not exceed 48 PRB.

As a non-limiting example, the time domain resource used by the synchronization signal may be 4 OFDM symbols, the 4 OFDM symbols starting at the 3 rd, 7 th, or 11 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, the time domain resource used by the synchronization signal group is 4 OFDM symbols, the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB, and the synchronization signal group is determined according to two consecutive synchronization signals; or, the time domain resource used by the synchronization signal is 2 OFDM symbols, where the 2 OFDM symbols start at the 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, or 13 th OFDM symbol in the slot; or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

As a non-limiting example, the synchronization signal is transmitted periodically, and the first transmitting module 41 may include: the first sending submodule 411 is adapted to send the synchronization signal to the ue every preset period.

As a variation, the synchronization signal is transmitted non-periodically, and the first transmitting module 41 may include: a determining submodule 412 adapted to determine a time interval between the wake-up instant and a paging occasion; a judging submodule 413 adapted to judge whether the transmission timing of the synchronization signal block is within the time interval; a second sending submodule 414, adapted to send the synchronization signal to the user equipment in the time interval when the determination result indicates that the sending timing of the synchronization signal block is not in the time interval.

Wherein the parameter set of the synchronization signal may use a parameter set of BWP or use a parameter set of a synchronization signal block. The synchronization signal includes system update indication information.

For more details of the operation principle and the operation mode of the transmitting apparatus 4, reference may be made to the description in fig. 2, and details are not repeated here.

The signaling interaction between the user equipment and the network (e.g., NR base station) employing embodiments of the present invention is further described below in conjunction with a typical application scenario.

In a typical application scenario, referring to fig. 5, after the ue 1 accesses the base station 2 in the network, the ue 1 enters a sleep state. The base station 2 may first perform operation s1, that is, the base station 2 transmits a synchronization signal to the user equipment 1 to wake up the user equipment 1, and allows the user equipment 1 to detect the synchronization signal after the wake-up, thereby achieving network synchronization. The synchronization signal may be a periodic signal, and the synchronization signal has a preset association relationship with a PDCCH monitoring occasion.

Secondly, the user equipment 1 may perform operation s2, that is, the user equipment 1 may determine the PDCCH monitoring occasion according to the preset association relationship.

Again, the base station 2 may perform operation s3, i.e. the base station 2 may transmit the PDCCH based on the PDCCH monitoring occasion. The PDCCH may be RMSI PDCCH, OSI PDCCH, or paging PDCCH.

Thereafter, the user equipment 1 may perform operation s4, i.e. the user equipment 1 monitors the PDCCH based on the PDCCH monitoring occasion.

For more contents of the working principles and working modes of the user equipment 1 and the base station 2 in the application scenario shown in fig. 5, reference may be made to the related descriptions in fig. 1 and fig. 2, which are not repeated herein.

In yet another exemplary application scenario, referring to fig. 6, after the user equipment 1 accesses the base station 2 in the network, the user equipment 1 enters a sleep state. The base station 2 may first perform operation s1, i.e. the base station 2 determines the time interval between the wake-up instant to wake up the user equipment 1 and the paging occasion to page the user equipment 1.

Second, the base station 2 may perform operation s2, that is, the base station 2 may determine whether the transmission timing of the SSB is within the time interval.

Again, when the determination result indicates that the sending timing of the synchronization signal block is not within the time interval, the base station 2 may perform operation s3, that is, the base station 2 sends the synchronization signal to the user equipment 1 within the time interval to wake up the user equipment 1, and enable the user equipment 1 to detect the synchronization signal after waking up, thereby implementing network synchronization. . The synchronization signal may be a non-periodic signal, the transmission timing of which is determined by the base station 2, and the synchronization signal has a preset association relationship with the PDCCH monitoring timing.

Further, the user equipment 1 may perform operation s4, that is, the user equipment 1 may determine the PDCCH monitoring occasion according to the preset association relationship.

Further, the base station 2 may perform operation s5, i.e. the base station 2 may transmit the PDCCH based on the PDCCH monitoring occasion. The PDCCH may be RMSI PDCCH, OSI PDCCH, or paging PDCCH.

Thereafter, the user equipment 1 may perform operation s6, i.e. the user equipment 1 monitors the PDCCH based on the PDCCH monitoring occasion.

For more contents of the working principles and working modes of the user equipment 1 and the base station 2 in the application scenario shown in fig. 6, reference may be made to the related descriptions in fig. 1 and fig. 2, which are not repeated herein.

Further, the embodiment of the present invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the technical solution of the method in the embodiment shown in fig. 1 and fig. 2 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The computer readable storage medium may include ROM, RAM, magnetic or optical disks, and the like.

Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and the processor executes the technical solution of the PDCCH determining method in the embodiment shown in fig. 1 when executing the computer instruction. In particular, the terminal may be a user equipment, e.g., an NR UE.

Further, an embodiment of the present invention further discloses a base station, which includes a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and the processor executes the technical scheme of the PDCCH sending method in the embodiment shown in fig. 2 when executing the computer instruction. Specifically, the base station may be an NR base station (e.g., a gNB).

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 synchronization signal detection and PDCCH determination, comprising:

after awakening, detecting a synchronization signal sent by a network to realize network synchronization again, wherein the synchronization signal has a preset incidence relation with the PDCCH monitoring opportunity; the synchronization signal is a signal other than an SSB;

and determining a PDCCH monitoring occasion according to the preset incidence relation, and detecting the PDCCH at the PDCCH monitoring occasion.

2. The method of claim 1, wherein the synchronization signal uses no more than 4 OFDM symbols in time domain resources and no more than 48 PRBs in time-frequency resource overhead.

3. The method of claim 2, wherein the time domain resource used by the synchronization signal is 4 OFDM symbols, and the 4 OFDM symbols start at the 3 rd, 7 th or 11 th OFDM symbol in a time slot;

or, the time domain resource used by the synchronization signal is 4 OFDM symbols, and the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB;

or, the time domain resource used by the synchronization signal is 2 OFDM symbols, the time domain resource used by the synchronization signal group is 4 OFDM symbols, the starting time domain position of the 4 OFDM symbols is consistent with the starting time domain position of the SSB configured by the MIB, and the synchronization signal group is determined according to two consecutive synchronization signals;

or, the time domain resource used by the synchronization signal is 2 OFDM symbols, where the 2 OFDM symbols start at the 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, or 13 th OFDM symbol in the slot;

or, the time domain resource used by the synchronization signal is 1 OFDM symbol, and the OFDM symbol is located in the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th or 14 th OFDM symbol in the slot.

4. The method of claim 2, wherein the synchronization signal has a total time-frequency resource overhead of 24 PRBs, wherein,

the frequency domain resource used by the synchronization signal is 6 PRBs, and the time domain resource is 4 or 2 OFDM symbols;

or, the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 2 OFDM symbols;

or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 1 OFDM symbol.

5. The method of claim 2, wherein the time-frequency resource of the synchronization signal is 48 PRBs, wherein,

the frequency domain resource used by the synchronization signal is 12 PRBs, and the time domain resource is 4 or 2 OFDM symbols;

or, the frequency domain resource used by the synchronization signal is 24 PRBs, and the time domain resource is 2 OFDM symbols;

or, the frequency domain resource used by the synchronization signal is 48 PRBs, and the time domain resource is 1 OFDM symbol.

6. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein the synchronization signal is transmitted periodically, and the detecting the synchronization signal transmitted by the network after the wake-up comprises:

and after waking up, detecting the synchronous signal sent by the network every preset period.

7. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein the synchronization signal is transmitted non-periodically, and the detecting the synchronization signal transmitted by the network after the wake-up comprises:

after waking up, determining a time interval between a wake-up time and a paging occasion;

judging whether a synchronous signal block can be received in the time interval;

and when the judgment result shows that the synchronous signal block cannot be received, detecting the synchronous signal sent by the network in the time interval.

8. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein a network configures a maximum duration for transmitting the synchronization signal, and the synchronization signal is repeatedly transmitted within the maximum duration.

9. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein the parameter set of the synchronization signal uses a parameter set of BWP or uses a parameter set of a synchronization signal block.

10. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

11. The synchronization signal detection and PDCCH determination method according to any one of claims 1 to 5, wherein the synchronization signal includes system update indication information.

12. A method for transmitting a synchronization signal and a PDCCH, comprising:

sending the synchronization signal to user equipment so that the user equipment detects the synchronization signal after awakening and realizes network synchronization again according to the synchronization signal, wherein the synchronization signal has a preset association relation with the PDCCH monitoring opportunity; the synchronization signal is a signal other than an SSB;

and determining a PDCCH monitoring opportunity according to the preset incidence relation, and sending the PDCCH at the PDCCH monitoring opportunity.

13. The transmission method of claim 12, wherein the synchronization signal uses no more than 4 OFDM symbols in time domain resources and no more than 48 PRB in time-frequency resource overhead.

14. The transmission method of claim 12, wherein the time domain resource used by the synchronization signal is 4 OFDM symbols, and the 4 OFDM symbols start from the 3 rd, 7 th, or 11 th OFDM symbol in a slot;

15. The transmission method according to claim 12, wherein the synchronization signal has a total time-frequency resource overhead of 24 PRBs, wherein,

16. The transmission method according to claim 12, wherein the synchronization signal has a total time-frequency resource overhead of 48 PRBs, wherein,

or, the frequency domain resource used by the synchronization signal occupies 48 PRBs, and the time domain resource is 1 OFDM symbol.

17. The transmission method according to any one of claims 12 to 16, wherein the synchronization signal is transmitted periodically, and wherein the transmitting the synchronization signal to the user equipment comprises:

and sending the synchronous signal to the user equipment at intervals of a preset period.

18. The transmission method according to any one of claims 12 to 16, wherein the synchronization signal is transmitted non-periodically, and wherein the transmitting the synchronization signal to the user equipment comprises:

determining a time interval between a wake-up time and a paging occasion;

judging whether the sending opportunity of the synchronous signal block is in the time interval or not;

and when the judgment result shows that the sending opportunity of the synchronous signal block is not in the time interval, sending the synchronous signal to the user equipment in the time interval.

19. The transmission method according to any of claims 12 to 16, wherein the network configures a maximum duration for transmitting the synchronization signal, and the synchronization signal is repeatedly transmitted within the maximum duration.

20. The transmission method according to any of claims 12 to 16, characterized in that the parameter set of the synchronization signal uses a parameter set of BWP or uses a parameter set of a synchronization signal block.

21. The transmission method according to any of claims 12 to 16, wherein the PDCCH refers to RMSI PDCCH or OSI PDCCH or paging PDCCH.

22. The transmission method according to any one of claims 12 to 16, wherein the synchronization signal comprises system update indication information.

23. An apparatus for synchronization signal detection and PDCCH determination, comprising:

the first detection module is suitable for detecting a synchronization signal sent by a network after awakening so as to realize network synchronization again, and the synchronization signal and the PDCCH monitoring opportunity have a preset association relationship; the synchronization signal is a signal other than an SSB;

and the second detection module is suitable for determining the PDCCH monitoring occasion according to the preset incidence relation and detecting the PDCCH at the PDCCH monitoring occasion.

24. An apparatus for transmitting a synchronization signal and a PDCCH, comprising:

the first sending module is suitable for sending the synchronization signal to user equipment so that the user equipment detects the synchronization signal after awakening and realizes network synchronization again according to the synchronization signal, and the synchronization signal and the PDCCH monitoring opportunity have a preset association relation; the synchronization signal is a signal other than an SSB;

and the second sending module is suitable for determining the PDCCH monitoring opportunity according to the preset incidence relation and sending the PDCCH at the PDCCH monitoring opportunity.

25. A storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the synchronization signal detection and PDCCH determination method of any one of claims 1 to 11 or the synchronization signal and PDCCH transmission method of any one of claims 12 to 22.

26. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the synchronization signal detection and PDCCH determination method according to any one of claims 1 to 11.

27. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the steps of the method of transmitting the synchronization signal and the PDCCH according to any one of claims 12 to 22.