CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. § 119 to Chinese Patent Application No. 201910632025.6 filed on Jul. 12, 2019, Chinese Patent Application No. 201910671090.X filed on Jul. 24, 2019, Chinese Patent Application No. 201910680705.5 filed on Jul. 26, 2019, Chinese Patent Application No. 201910806153.8 filed on Aug. 29, 2019, Chinese Patent Application No. 201910863505.3 filed on Sep. 12, 2019, Chinese Patent Application No. 201911083856.9 filed on Nov. 7, 2019, Chinese Patent Application No. 201911158215.5 filed on Nov. 22, 2019 and Chinese Patent Application No. 201911168718.0 filed on Nov. 25, 2019 in the Chinese Intellectual Property Office, the disclosures of which are herein incorporated by reference in their entirety.

BACKGROUND

1. Field

The present disclosure relates to a wireless communication technical field, and more specifically, relates to a method and apparatus for receiving downlink data in an RRC (Radio Resource Control) idling or inactive state.

2. Description of Related Art

The present disclosure further relates to a technical field of a radio communication system, and more particularly to a resource configuration method of an uplink signal and a user equipment thereof.

The present disclosure further relates to the field of wireless communication, and more particularly, to a method and device for data transmission of small packets.

To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post LTE System’. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.

The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology” have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.

In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.

For Internet-Of-Things (IOT) User Equipment (UE), for example, Machine-Type Control (MTC) UE, a Narrow Band Internet of Things (NB-IOT) and the like, there is the higher requirement for a battery life due to restrictions of application scenarios. UE power consumption has always been a key improvement indication while designing a system, and relevant standards are also constantly evolving based on a goal of reducing the UE power consumption. In a current 5G system, UE must be supported in an RRC connected state regardless of performing uplink or downlink data transmission. This is relatively inefficient for MTC or IoT (also referred to as NR-light) apparatuses. As for characteristics of sparse small packets of IoT, signaling interaction between the terminals and the Internet may be simplified, for example, data transmission or the like is performed in the case where no RRC connected state is established. This may simplify the signaling better, and save the power consumption. How to perform uplink/downlink data transmission in an RRC idling or inactive state will become a very important research orientation. In addition, how to perform a random access process rapidly, which may also simplify the signaling and save the power consumption, and will be a very important research orientation as well.

In some mobile communication systems (licensed spectrum and/or unlicensed spectrum), in order to achieve faster signal transmission and reception, it is considered to transmit the random access preamble and the random access data part together (indicated as message A), and then the feedback from the user equipment (indicated as message B) is searched in a downlink channel. However, how to determine the configuration of the random access preamble and the random access data resource in the message A is a problem necessary to be resolved. In addition, how to determine a mapping relation between the random access resource and the random access data resource to make the base station better detect the message A transmitted by the user is also a problem necessary to be resolved.

In some communication systems (licensed spectrum and/or unlicensed spectrum), some user equipment only needs to send a certain amount of data packets at certain times. In order to achieve faster signal transmission and reception, if the traditional method is used It requires four steps of random access to access the system, and then requests resources from the system and performs data transmission and other operations. If there are many small packet services, it will cause a lot of waste of signaling resources. Therefore, how to effectively transmit small packet data is a problem that needs to be solved.

SUMMARY

Exemplary embodiments of the present disclosure aim to provide a downlink transmission method performed by user equipment (UE) and UE to perform downlink data transmission in an RRC connected state or an RRC idling or inactive state.

According to the exemplary embodiments of the present disclosure, a downlink transmission method performed by the UE is provided, the method including: receiving a predefined downlink signal in a predefined downlink resource; and performing HARQ-ACK) feedback according to the received downlink signal.

Alternatively, the predefined downlink signal is a second type PDSCH (Physical Downlink Shared Channel), and the performing of the HARQ-ACK feedback according to the received downlink signal may include: demodulating the second type PDSCH, and performing the HARQ-ACK feedback according to the demodulation result.

Alternatively, the downlink transmission method may further include: entering a dormant state when a predefined dormant condition is satisfied.

Alternatively, the predefined downlink resource may be a predefined second type PDSCH resource.

Alternatively, the predefined second type PDSCH resource is an RAR (Random Access Response) PDSCH downlink resource determined according to an RAR PDCCH.

Alternatively, the predefined downlink resource may be a first search space, and the first search space is a paging search space for monitoring a PDCCH scheduling a first type PDSCH.

Alternatively, the predefined downlink resource may be a third search space, and the third search space is a search space for monitoring a PDCCH scheduling the second type PDSCH and for receiving a PDCCH that supports the UE to perform downlink transmission in an RRC idling/inactive state.

Alternatively, when the predefined downlink resource is the third search space, the receiving of the predefined downlink signal in the predefined downlink resource may include: receiving a predefined PDCCH in the third search space; and receiving a second type PDSCH according to the PDCCH received in the third search space.

Alternatively, when the predefined downlink resource is the first search space, the receiving of the predefined downlink signal in the predefined downlink resource may include: receiving a predefined PDCCH in the first search space; receiving a first type PDSCH according to the PDCCH received in the first search space; and receiving a second type PDSCH.

Alternatively, the receiving of the second type PDSCH may include: receiving a PDCCH in the second search space; and receiving the second type PDSCH according to the PDCCH received in the second search space.

Alternatively, before the PDCCH is received in the second search space, the downlink transmission method may further include: transmitting a PRACH (Physical Random Access Channel) according to the first type PDSCH.

Alternatively, when the predefined downlink resource is the first search space, the receiving of the predefined downlink signal in the predefined downlink resource may include: receiving a predefined PDCCH in the first search space; receiving a first type PDSCH according to the PDCCH received in the first search space; transmitting a PRACH according to the first type PDSCH; monitoring a PDCCH in the predefined second search space within a predetermined time window; receiving the PDCCH in the second search space when the PDCCH is monitored within the predetermined time window; and receiving a second type PDSCH when the PDCCH received in the second search space indicates receiving the second type PDSCH.

Alternatively, the entering the dormant state may include: entering the dormant state when the PDCCH received in the second search space indicates entering the dormant state.

Alternatively, the entering the dormant state may include: entering the dormant state when no PDCCH is monitored within the predetermined time window.

Alternatively, the first type PDSCH may include downlink data, and/or the first type PDSCH may include at least one item of: PRACH resource information, second type PDSCH resource information, HARQ-ACK resource information, transmission mode information, a first type RNTI (Radio Network Temporary Identity), and second search space resource information.

And/or, after the first type PDSCH is received, the downlink transmission method may further include: according to the first type PDSCH, determining at least one of following transmission modes: performing Early Data Transmission (EDT) in an RRC idling/inactive state, performing Mobile-terminated Early Data Transmission (MT-EDT) in an RRC idling/inactive state, performing Mobile Originated Early Data Transmission (MO-EDT) in an RRC idling/inactive state, establishing an RRC connection, performing contention-based random access, performing contention-free random access, performing 4-step random access channel or 2-step random access channel, returning to a specific transmission process when a predefined condition is satisfied, and/or, determining PRACH resource information according to a first type PDSCH, and/or, determining HARQ-ACK resource information according to a first type PDSCH, and/or, determining a first type RNTI according to a first type PDSCH, and/or, determining a second search space according to a first type PDSCH.

Alternatively, the PRACH resource information included in the first type PDSCH may include at least one item of: a preamble index, a number of repetitions of a preamble, a PRACH format, a PRACH time-frequency resource, a synchronization signal for determining RACH (Random Access Channel) timing, and broadcast channel SS/PBCH information.

Alternatively, when the predefined downlink resource is the first search space, before the PDCCH is received in the second search space, the downlink transmission method may further include: determining the second search space according to at least one mode of: determining the second search space according to configuration information of cell system information, determining the second search space according to UE-specific RRC signaling configuration information, determining the second search space according to the first type PDSCH, determining the second search space by combining various kinds of signaling, and determining the second search space according to a predefined search space.

Alternatively, the receiving of the PDCCH in the search space may include: receiving the PDCCH according to the first type RNTI or an RA-RNTI, wherein the first type RNTI is determined by at least one item of: a first type RNTI allocated when the UE is in an RRC connected state, an RNTI included in the first type PDSCH, a C-RNTI allocated when the UE is in the previous RRC connected state, a Paging UE-Identity, and a random access RNTI (RA-RNTI).

Alternatively, the PDCCH received in the second search space may include at least one item of: PDSCH scheduling information, uplink timing adjustment information, uplink channel information for feeding back an Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK), first type RNTI information, an indication of a UE transmission mode, wherein the indication of the UE transmission mode includes: an indication of transmitting the PRACH, an indication of receiving the PDSCH, and an indication of feeding back the HARQ-ACK through the PRACH or a Physical Uplink Control Channel (PUCCH), wherein different indication contents are distinguished by a separate bit field in a Display Control Interface (DCI) of the PDCCH in the second search space, or different indication contents are distinguished by a specific bit value/value combination in the DCI of the PDCCH in the second search space, or different indication contents are distinguished by performing Cyclic Redundancy Check (CRC) scrambling on the PDCCH in the second search space through different RNTIs, or different indication contents are distinguished by different DCI formats.

Alternatively, after the PRACH is transmitted, the downlink transmission method may further include: returning to the contention-based random access process when a corresponding downlink response is not received in the second search space within the time window, or retransmitting a specific PRACH when the corresponding downlink response is not received in the second search space within the time window, or entering the dormant state when the corresponding downlink response is not received in the second search space within the time window.

Alternatively, the downlink transmission method may further include: determining the second type PDSCH resources according to the PDSCH resource information included in the PDCCH, the PDSCH resource information included in the first type PDSCH, or at least one PDSCH resource information configured by a base station in an RRC connected state, or determining the second type PDSCH resources according to the PRACH.

Alternatively, the second type PDSCH may include at least one item of: downlink data, uplink channel information for carrying an HARQ-ACK, uplink timing adjustment information, uplink scheduling information, a first type RNTI, and an Msg B PDSCH in a 2-step random process, wherein the second type PDSCH is scrambled according to the first type RNTI, and/or the RA-RNTI, and/or a cell ID (Identity), and/or a sequence determined by the PRACH.

Alternatively, parameters of the third search space may be selectively configured, and if parameters of a specific search space are not configured, a search space for a predefined usage is used as the specific search space, wherein the third search space is determined according to the UE-specific RRC signaling, or the third search space is determined according to the cell system information, or the third search space is determined according to specific parameters of the UE and parameters of specific search spaces.

Alternatively, when the predefined downlink resource is the predefined second type PDSCH resource, the predefined second type PDSCH resource is configured by a base station when the UE is in an RRC connected state, and may be used for downlink transmission in an RRC idling/inactive state.

Alternatively, when the predefined downlink resource is the predefined second type PDSCH resource, the predefined second type PDSCH resource is indicated by the RAR PDCCH in the 2-step random access process. The second type PDSCH is an Msg B RAR PDSCH in the 2-step random access process. Alternatively, the performing the HARQ-ACK feedback according to the demodulation result may include: transmitting the ACK if the PDSCH is demodulated correctly; and not transmitting an uplink signal if the PDSCH is demodulated incorrectly, or transmitting the ACK or NACK according to the demodulation result of the PDSCH.

Alternatively, when the second type PDSCH is the Msg B RAR PDSCH, the performing the HARQ-ACK feedback according to the demodulation result may include: the UE feeding back the ACK when a successful Msg B RAR sPDU (Session Protocol Data Unit) is demodulated out by the UE in the Msg B RAR PDSCH. An uplink slot/sub-slot for feeding back the ACK is determined according to HARQ-ACK timing indicated in the RAR PDSCH or RAR PDCCH and a predefined time offset.

Alternatively, the ACK and NACK may be carried by the PRACH or PUCCH, or the ACK may be carried by a PUSCH (Physical Uplink Shared Channel).

Alternatively, the downlink transmission method may further include: determining whether to transmit a PUCCH according to whether uplink timing is valid, wherein the PUCCH carrying the ACK or NACK is transmitted according to the uplink timing if the uplink timing is valid, and the PUCCH is not transmitted if the uplink timing is invalid; or, the PUCCH carrying the ACK or NACK is transmitted according to the uplink timing if the uplink timing is valid, and the PRACH is transmitted but the PUCCH is not transmitted if the uplink timing is invalid.

Alternatively, after the second type PDSCH is received, the downlink transmission method may further include: monitoring the PDCCH in the second or third search space within a predetermined time window, wherein the predetermined time window takes any following item as a start point: an end symbol of an uplink channel for performing the ACK feedback by the UE, an end position of a slot/sub-slot at which the end symbol of the uplink channel for performing the ACK feedback by the UE is located, an end symbol of the PDSCH transmitted by the UE, an end position of the slot/sub-slot at which the end symbol of the PDSCH transmitted by the UE is located, an end symbol of the PUSCH transmitted by the UE, and an end position of the slot/sub-slot at which an end symbol of the PUSCH transmitted by the UE is located.

Alternatively, the downlink transmission method may further include: in a predetermined time window, receiving at least one of the following items transmitted by the base station: downlink control channel resource configuration information, PRACH configuration information, uplink channel configuration information of the HARQ-ACK feedback, scheduling information of the second type PDSCH, PUSCH scheduling information, transmission mode indication information, PRACH transmission triggering information, triggering information of the contention-based random access process, indication information for entering a dormant state. Or the entering the dormant state includes: entering the dormant state when no PDCCH is received within the predetermined time window or the indication information for entering the dormant state is received.

Alternatively, the downlink transmission method may further include: returning to the contention-based random access process according to a received fallback indication or based on a fallback triggering condition being detected, wherein the fallback triggering condition includes at least one item of: the uplink timing being invalid, the PDCCH scheduling the second type PDSCH is received but the uplink timing being invalid, no response is received within a predefined time window after the contention-free PRACH is transmitted.

According to the exemplary embodiments of the present disclosure, a user equipment is provided, including: a signal receiving unit configured to receive a predefined downlink signal in a predefined downlink resource; and a feedback unit configured to perform HARQ-ACK feedback according to the received downlink signal.

Alternatively, the predefined downlink signal is the second type PDSCH, the feedback unit may be configured to demodulate the second type PDSCH, and to perform the ACK feedback according to the demodulation result. Or, the UE may further include: a dormant unit configured to enter a dormant state when a predefined dormant condition is satisfied.

Alternatively, the predefined downlink resource is a predefined second type PDSCH resource, or the predefined downlink resource is a first search space which is a paging search space for monitoring the PDCCH scheduling the first type PDSCH, or the predefined downlink resource is a third search space which is a search space for monitoring the PDCCH scheduling the second type PDSCH and for receiving a PDCCH that supports the UE to perform downlink transmission in the RRC idling/inactive state.

Alternatively, the signal receiving unit may include: a third PDCCH receiving unit configured to receive a predefined PDCCH in the third search space when the predefined downlink resource is the third search space; and a third PDSCH receiving unit configured to receive a second type PDSCH according to the PDCCH received in the third search space, wherein the signal receiving unit may include: a first PDCCH receiving unit configured to receive a predefined PDCCH in the first search space when the predefined downlink resource is the first search space; a first PDSCH receiving unit configured to receive a first type PDSCH according to the PDCCH received in the first search space; and a second receiving unit configured to receive the second type PDSCH. Or, wherein the second receiving unit may include: a second PDCCH receiving unit configured to receive a PDCCH in the second search space; and a second PDSCH receiving unit configured to receive a second type PDSCH according to the PDCCH received in the second search space. Or, the UE may further include a PRACH transmitting unit configured to transmit a PRACH according to the first type PDSCH.

Alternatively, the signal receiving unit may include: a first PDCCH receiving unit configured to receive a predefined PDCCH in the first search space when the predefined downlink resource is the first search space; a first PDSCH receiving unit configured to receive a first type PDSCH according to the PDCCH received in the first search space; a PRACH transmitting unit configured to transmit a PRACH according to the first type PDSCH; a PDCCH monitoring unit configured to monitor a PDCCH in the second search space within a predetermined time window; a second PDCCH receiving unit configured to receive the PDCCH in the second search space when the PDCCH is monitored within the predetermined time window; a second PDSCH receiving unit configured to receive a second type PDSCH when the PDCCH received in the second search space indicates receiving the second type PDSCH; or the dormant unit is configured to enter a dormant state when the PDCCH received in the second search space indicates entering the dormant state, or the dormant unit is configured to enter the dormant state when no PDCCH is monitored within the predetermined time window.

Alternatively, the first type PDSCH may include downlink data, and/or, the first type PDSCH may include at least one item of: PRACH resource information, second type PDSCH resource information, HARQ-ACK resource information, transmission mode information, a first type RNTI, and second search space resource information. And/or, the UE may further include: a mode determining unit configured to, after receiving the first type PDSCH, according to the first type PDSCH, determine at least one of following transmission modes: performing EDT in an RRC idling/inactive state, performing MT-EDT in an RRC idling/inactive state, performing MO-EDT in an RRC idling/inactive state, establishing an RRC connection, performing contention-based random access, performing contention-free random access, performing 4-step random access channel or 2-step random access channel, returning to a specific transmission process when a predefined condition is satisfied, and/or, determining the PRACH resource information according to the first type PDSCH, and/or, determining HARQ-ACK resource information according to the first type PDSCH, and/or, determining a first type RNTI according to the first type PDSCH, and/or, determining a second search space according to the first type PDSCH.

Alternatively, the PRACH resource information included in the first type PDSCH may include at least one item of: a preamble index, a number of repetitions of a preamble, a PRACH format, a PRACH time-frequency resource, a synchronization signal for determining RACH timing, and broadcast channel SS/PBCH information.

Alternatively, the UE may further include: a space determining unit configured to, when the predefined downlink resource is the first search space, determine the second search space according to at least one manner of: determining the second search space according to configuration information of cell system information, determining the second search space according to UE-specific RRC signaling configuration information, determining the second search space according to the first type PDSCH, determining the second search space by combining various kinds of signaling, and determining the second search space according to a predefined search space.

Alternatively, the signal receiving unit, or the first PDCCH receiving unit, the second PDCCH receiving unit and the third PDCCH receiving unit in the signal receiving unit may be configured to receive the PDCCH according to the first type RNTI or RA-RNTI, wherein the first type RNTI is determined according to at least one item of: a first type RNTI allocated when the UE is in an RRC connected state, an RNTI included in the first type PDSCH, a C-RNTI allocated when the UE is in the previous RRC connected state, a Paging UE-Identity, and an RA-RNTI.

Alternatively, the PDCCH received in the second search space may include at least one item of: PDSCH scheduling information, uplink timing adjustment information, uplink channel information for feeding back a HARQ-ACK, first type RNTI information, and an indication of a UE transmission mode, wherein the indication of the UE transmission mode includes: an indication of transmitting the PRACH, an indication of receiving the PDSCH, an indication of feeding back the HARQ-ACK through the PRACH or the PUCCH, wherein different indication contents are distinguished by a separate bit field in a DCI of the PDCCH in the second search space, or different indication contents are distinguished by a specific bit value/value combination in the DCI of the PDCCH in the second search space, or different indication contents are distinguished by performing CRC scrambling on the PDCCH in the second search space through different RNTIs, or different indication contents are distinguished through different DCI formats.

Alternatively, the UE may further include: a fallback unit configured to return to the contention-based random access process when the corresponding downlink response is not received in the second search space within the time window, or the UE further includes: a retransmitting unit configured to retransmit the specific PRACH when the corresponding downlink response is not received in the second search space within the time window, or the dormant unit further configured to enter the dormant state when the corresponding downlink response is not received in the second search space within the time window.

Alternatively, the UE may further include: a resource determining unit configured to determine the second type PDSCH resources according to the PDSCH resource information included in the PDCCH, the PDSCH resource information included in the first type PDSCH, or at least one set of PDSCH resource information configured by a base station in an RRC connected state, or determine the second type PDSCH resources according to the PRACH.

Alternatively, the second type PDSCH may include at least one item of: downlink data, uplink channel information for carrying an HARQ-ACK, uplink timing adjustment information, uplink scheduling information, and a first type RNTI, wherein the second type PDSCH is scrambled according to the first type RNTI, and/or the RA-RNTI, and/or a cell ID, and/or a sequence determined by the PRACH.

Alternatively, parameters of the third search space may be selectively configured, and if parameters of a specific search space are not configured, a search space for a predefined usage is used as the specific search space, wherein the third search space is determined according to the UE-specific RRC signaling, or the third search space is determined according to the cell system information, or the third search space is determined according to specific parameters of the UE and parameters of specific search spaces.

Alternatively, when the predefined downlink resource is the predefined second type PDSCH resource, the predefined second type PDSCH resource is configured by a base station when the UE is in an RRC connected state, and may be used for downlink transmission in an RRC idling/inactive state.

Alternatively, the feedback unit may be configured to transmit the ACK if the PDSCH is demodulated correctly; and not to transmit an uplink signal if the PDSCH is demodulated incorrectly, or to transmit the ACK or NACK according to the demodulation result of the PDSCH.

Alternatively, the ACK and NACK may be carried by a PRACH or a PUCCH, or the ACK may be carried by a PUSCH.

Alternatively, the UE may further include: a transmission determining unit configured to determine whether to transmit a PUCCH according to whether uplink timing is valid, wherein the PUCCH carrying the ACK or NACK is transmitted according to the uplink timing if the uplink timing is valid, and the PUCCH is not transmitted if the uplink timing is invalid; or the PUCCH carrying the ACK or NACK is transmitted according to the uplink timing if the uplink timing is valid, and the PRACH is transmitted but the PUCCH is not transmitted if the uplink timing is invalid.

Alternatively, the UE may further include: a PDCCH monitoring unit configured to monitor a PDCCH in the second or third search space within a predetermined time window, wherein the predetermined time window takes any following item as a start point: an end symbol of an uplink channel for performing the ACK feedback by the UE, an end position of a slot/sub-slot at which the end symbol of the uplink channel for performing the ACK feedback by the UE is located, an end symbol of the PDSCH transmitted by the UE, an end position of the slot/sub-slot at which the end symbol of the PDSCH transmitted by the UE is located, an end symbol of the PUSCH transmitted by the UE, and an end position of the slot/sub-slot at which an end symbol of the PUSCH transmitted by the UE is located.

Alternatively, the UE may further include: an information receiving unit configured to, within a predetermined time window, receive at least one of the following items transmitted by a base station: downlink control channel resource configuration information, PRACH configuration information, uplink channel configuration information for ACK feedback, scheduling information of the second type PDSCH, PUSCH scheduling information, transmission mode indication information, PRACH transmission triggering information, triggering information of the contention-based random access process, indication information for entering a dormant state. Or, the dormant unit is further configured to enter the dormant state when no PDCCH is received within the predetermined time window or the indication information for entering the dormant state is received.

Alternatively, the fallback unit may further be configured to return to the contention-based random access process according to a received fallback indication or based on a fallback triggering condition being detected, wherein the fallback triggering condition includes at least one item of: the uplink timing being invalid, the PDCCH scheduling the second type PDSCH is received but the uplink timing being invalid, no response is received within a predefined time window after the contention-free PRACH is transmitted.

According to the exemplary embodiments of the present disclosure, a computer-readable storage medium stored with a computer program is provided, when the computer program is executed by a processor, the downlink transmission method according to the present disclosure is implemented.

According to the exemplary embodiments of the present disclosure, a computing device is provided, and the computing device includes: a processor; and a storage stored with a computer program, wherein when the computer program is executed by the processor, the downlink transmission method according to the present disclosure is implemented.

The downlink transmission method performed by the UE and the UE according to the exemplary embodiments of the present disclosure implement the performing of downlink data transmission in the RRC idling or inactive state by receiving the predefined downlink signal in the predefined downlink resource, and performing the HARQ-ACK feedback according to the received downlink signal.

Other aspects and/or advantages of the general concept of the present disclosure will be partially illustrated in the subsequent depictions, and the other part will become clear through the depiction or may be learned through the implementation of the general concept of the present disclosure.

The present disclosure provides method and apparatus for transmitting and receiving signal effectively.

Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms “application” and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase “computer readable program code” includes any type of computer code, including source code, object code, and executable code. The phrase “computer readable medium” includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A “non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.

Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

