CN117395672A

CN117395672A - Down data transmission method and related equipment

Info

Publication number: CN117395672A
Application number: CN202210774955.7A
Authority: CN
Inventors: 李阳; 刘悦; 陈宏�; 徐凯; 李文越
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2024-01-12

Abstract

The embodiment of the disclosure provides a downlink data transmission method and related equipment, and belongs to the technical field of communication. The method provided by the embodiment of the disclosure is executed by the network equipment, and comprises the following steps: transmitting a radio resource control release message to a terminal, wherein the radio resource control release message comprises inactive downlink small data transmission configuration information, and the inactive downlink small data transmission configuration information is used for configuring pre-configured resources for receiving downlink small data transmitted by the network equipment when the terminal is in an inactive state; sending a first downlink control signaling to the terminal, wherein the first downlink control signaling is used for activating the pre-configured resource; transmitting the downlink small data to the terminal in an inactive state on the pre-configured resource; and after the downlink small data is transmitted to the terminal in the inactive state, sending a second downlink control signaling to the terminal, wherein the second downlink control signaling is used for deactivating the pre-configured resource.

Description

Down data transmission method and related equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a downlink data transmission method, a network device, a terminal, a communication device, and a computer readable storage medium.

Background

For data service transmission of a common terminal, compared with a 4G (the 4G th generation mobile communication technology, fourth generation mobile communication technology) system, a New state, namely an Inactive state, is introduced into a 5G (the 5G th generation mobile communication technology, fifth generation mobile communication technology) NR (New Radio), so as to enable a User Equipment (UE) or a terminal to quickly enter a connection state to transmit data, and meanwhile, signaling overhead brought by a mobile process and a state transition process is reduced. In the RRC (Radio Resource Control ) INACTIVE state, the Non-access stratum (NAS) of the UE remains in a connected state, but the air interface connection corresponding to the Access Stratum (AS) of the UE is temporarily suspended.

In the related art, if there is a downlink small data packet or downlink small data to be transmitted in the Inactive state, the terminal needs to be firstly converted from the Inactive state to the Connected state (connection state), and then establishes connection with the control plane and the user plane at the network side, and then transmits the data, thereby increasing the delay and signaling overhead of data transmission.

Disclosure of Invention

The embodiment of the disclosure provides a downlink data transmission method, network equipment, a terminal, communication equipment and a computer readable storage medium, which can reduce time delay and signaling overhead of inactive downlink small data transmission.

The embodiment of the disclosure provides a downlink data transmission method, which is executed by network equipment, and comprises the following steps: transmitting a radio resource control release message to a terminal, wherein the radio resource control release message comprises inactive state downlink small data transmission configuration information, the inactive state downlink small data transmission configuration information is used for configuring pre-configured resources for receiving downlink small data transmitted by the network equipment when the terminal is in an inactive state, the inactive state downlink small data transmission configuration information comprises pre-configured authorized semi-persistent scheduling configuration information, and the pre-configured authorized semi-persistent scheduling configuration information is used for configuring semi-persistent scheduling resources for transmitting the inactive state downlink small data; when the network equipment transmits downlink small data to the terminal in an inactive state, a first downlink control signaling is sent to the terminal, wherein the first downlink control signaling is used for activating the pre-configured resource which is sent by the terminal in the inactive state and used for receiving the downlink small data in the inactive state; transmitting the downlink small data to the terminal in an inactive state on the pre-configured resource; and after the downlink small data is transmitted to the terminal in the inactive state, sending a second downlink control signaling to the terminal, wherein the second downlink control signaling is used for deactivating the pre-configured resource for the transmission of the inactive state downlink small data based on semi-persistent scheduling, which is issued for the terminal.

The embodiment of the disclosure provides a downlink data transmission method, which is executed by a terminal and comprises the following steps: receiving a radio resource control release message sent by a network device, wherein the radio resource control release message comprises inactive state downlink small data transmission configuration information, the inactive state downlink small data transmission configuration information is used for configuring pre-configured resources for receiving downlink small data sent by the network device when the terminal is in an inactive state, the inactive state downlink small data transmission configuration information comprises pre-configured authorized semi-persistent scheduling configuration information, and the pre-configured authorized semi-persistent scheduling configuration information is used for configuring semi-persistent scheduling resources for inactive state downlink small data transmission; receiving a first downlink control signaling sent by the network equipment; responding to the first downlink control signaling to enter an inactive state, and activating the pre-configured resource which is transmitted by the terminal in the inactive state and used for receiving the downlink small data in the inactive state; receiving the downlink small data sent by the network equipment on the preconfigured resource; after receiving the downlink small data, receiving a second downlink control signaling sent by the network equipment; and responding to the second downlink control signaling to deactivate the pre-configured resource for non-activated downlink small data transmission based on semi-persistent scheduling issued by the terminal.

The embodiment of the disclosure provides a network device, comprising: a sending unit, configured to send a radio resource control release message to a terminal, where the radio resource control release message includes inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information is used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information includes preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information is used to configure semi-persistent scheduling resources for transmitting the inactive downlink small data; the sending unit is further configured to send a first downlink control signaling to the terminal when the network device has downlink small data to be transmitted to the terminal in an inactive state, where the first downlink control signaling is used to activate the preconfigured resource for receiving the downlink small data in the inactive state, which is issued by the terminal in the inactive state; the sending unit is further configured to send the downlink small data to the terminal in the inactive state on the preconfigured resource; the sending unit is further configured to send a second downlink control signaling to the terminal after the downlink small data is transferred to the terminal in the inactive state, where the second downlink control signaling is used to deactivate the pre-configured resource for inactive state downlink small data transmission based on semi-persistent scheduling, which is issued for the terminal.

The embodiment of the disclosure provides a terminal, which comprises: a receiving unit, configured to receive a radio resource control release message sent by a network device, where the radio resource control release message includes inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information is configured to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information includes preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information is configured to configure semi-persistent scheduling resources for transmitting inactive downlink small data; the receiving unit is further configured to receive a first downlink control signaling sent by the network device; the processing unit is used for responding to the first downlink control signaling, entering a non-activated state and activating the pre-configured resource which is transmitted by the terminal in the non-activated state and used for receiving the non-activated downlink small data; the receiving unit is further configured to receive, on the preconfigured resource, the downlink small data sent by the network device; the receiving unit is further configured to receive a second downlink control signaling sent by the network device after receiving the downlink small data; and the processing unit is further configured to deactivate the pre-configured resource for inactive downlink small data transmission based on semi-persistent scheduling issued by the terminal in response to the second downlink control signaling.

The disclosed embodiments provide a communication device including at least one processor and a communication interface. The communication interface is configured to interact with other communication devices by the communication device, and when the program instructions are executed in the at least one processor, implement a method according to any one of the possible implementations of the above embodiments.

Optionally, the communication device may further comprise a memory. The memory is used for storing programs and data.

Alternatively, the communication device may be a network device and/or a terminal.

The disclosed embodiments provide a computer readable storage medium having stored thereon a computer program for execution by a communication device, which when executed by the communication device, implements a method in any one of the possible implementations of the disclosed embodiments.

For example, the computer readable storage medium may have stored therein a computer program for execution by a network device, which when executed by a processor, implements instructions of the method as performed by the network device in embodiments of the disclosure.

For example, the computer readable storage medium may have stored therein a computer program for execution by a terminal, which when executed by a processor, implements instructions of the methods as performed by the terminal in embodiments of the disclosure.

Embodiments of the present disclosure provide a computer program product containing instructions. The computer program product, when run on a communication device, causes the communication device to execute instructions of the method in the parties of the present disclosure or any one of the possible implementations of the parties.

For example, the computer program product, when executed on a network device, causes the network device to perform the instructions of the method in any one of the possible implementations of the embodiments of the disclosure.

For example, the computer program product, when executed on a terminal, causes the terminal to execute instructions of the method in any one of the possible implementations of the embodiments of the disclosure.

The disclosed embodiments provide a system chip comprising an input-output interface and at least one processor for invoking instructions in a memory to perform the operations of the method in any of the possible implementations of the disclosure.

Optionally, the system chip may further include at least one memory for storing instructions for execution by the processor and a bus.

The embodiment of the disclosure provides a communication system, which comprises the network equipment and a terminal.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 schematically shows a process of recovering from an inactive process.

Fig. 2 schematically illustrates a flow chart of a downstream data transmission method according to an embodiment of the present disclosure.

Fig. 3 schematically illustrates an interactive schematic diagram of a downlink data transmission method according to an embodiment of the present disclosure.

Fig. 4 schematically shows a flow chart of a downstream data transmission method according to another embodiment of the present disclosure.

Fig. 5 schematically illustrates a block diagram of a network device according to an embodiment of the disclosure.

Fig. 6 schematically illustrates a block diagram of a terminal according to an embodiment of the present disclosure.

Fig. 7 schematically illustrates a block diagram of a communication device according to an embodiment of the disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.

In the description of the present disclosure, unless otherwise indicated, "/" means "or" and, for example, a/B may mean a or B. "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Furthermore, "at least one" means one or more, and "a plurality" means two or more. The terms "first," "second," and the like do not limit the number and order of execution, and the terms "first," "second," and the like do not necessarily differ.

The technical solution of the embodiment of the present disclosure may be applied to various communication systems, for example: global system for mobile communications (global system for mobile communications, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA) systems, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication systems, future fifth generation (5G) systems or new air interface (NR), and the like.

The technical scheme provided by the disclosure can be applied to various application scenes, such as machine-to-machine (machine to machine, M2M), macro-micro communication, eMBB (Enhanced Mobile Broadband ), ul lc (Ultra reliable and low latency communication, ultra-high reliability and ultra-low latency communication), mass internet of things communication (massive machine type communication, mctc) and the like.

It can be understood that, with the evolution of the network architecture and the appearance of new service scenarios, the technical solution provided by the embodiments of the present disclosure is equally applicable to similar technical problems.

To facilitate an understanding of the embodiments of the present disclosure, several terms referred to in this disclosure are briefly described below.

NF: network function, network function. The 5G disassembles the related functions separately, each of which performs, through reference point access, they are called Network Functions (NF). NF includes, but is not limited to AMF, SMF, UPF, UDM, etc.

AMF: access and mobility management function, access and mobility management functions.

SMF: session management function, session management function.

UPF: user plane function, user plane functions.

UDM: unified Data Management, unifying data management functions.

Similar to the idle state, the UE in RRC INACTIVE state can move inside a RAN (wireless access network, radio access network, hereinafter referred to as radio) notification area (RAN Notification Area, RNA) configured on one network side without notifying NG-RAN (5G access network) through RRC signaling. At this time, both the UE side and the RAN side store the AS layer Context (Context) in the UE INACTIVE state, and in the process of restoring the connection with the RAN side air interface, the INACTIVE state UE may perform related operations based on the previous AS layer Context in the UE INACTIVE state, so AS to reduce signaling interaction, thereby implementing fast entry of the UE into the connection state.

Wherein the Last Serving gNB (gNB stands for 5G base station) retains the UE context and NG connections of UE-related AMFs and UPFs, commonly referred to as "anchor points". The core network does not perceive the INACTIVE state of the UE, and considers it as being in the connected state. In the current mechanism, it is determined by the anchor base station whether to replace the anchor. In general, when the anchor point needs to be replaced, the anchor point base station will send the relevant UE Context and security information to the current serving base station (such as the gNB in fig. 1), and the relevant signaling flow is shown in fig. 1.

As shown in fig. 1, a procedure from resume in the inactive procedure is shown. When the UE is in rrc_inactive and CM-CONNECTED (CM is a shorthand for connect management, i.e., connection management CONNECTED state), the following steps may be performed:

The ue sends an rrcresemerequest message, i.e. a radio resource control resume request message, to the gNB.

After the gNB receives the RRCResumeRequest message sent by the UE, a RETRIEVE UE CONTEXT REQUEST message, i.e. a retrieve UE context request message, may be sent to the Last Serving gNB.

3.Last Serving gNB after receiving the RETRIEVE UE CONTEXT REQUEST message sent by the gNB, the gNB may be replied to RETRIEVE UE CONTEXT RESPONSE, i.e., a UE context response message is retrieved.

After the gNB receives RETRIEVE UE CONTEXT RESPONSE sent by the Last Serving gNB, an RRCResume message may be sent to the UE.

After receiving the rrcreseume message sent by the gNB, the UE may enter rrc_connected and CM-CONNECTED states.

5. After the UE transitions to rrc_connected and CM-CONNECTED states, the UE may send an rrcresmeecomplete message, i.e., a radio resource control recovery complete message, to the gNB.

6. Alternatively, after the gNB receives the RRCResumeCommole message sent by the UE, the gNB may send an Xn-U ADDRESS ADICATION message, i.e. an Xn-U address indication message, to the Last Serving gNB.

7. After the gNB receives the RRCResumeCommple message sent by the UE, the gNB may send a PATH SWITCH REQUEST message, i.e., a path switch REQUEST message, to the AMF.

8. After the AMF receives the PATH SWITCH REQUEST sent by the gNB, a PATH SWITCH REQUEST RESPONSE message, i.e., a path switch REQUEST RESPONSE message, may be sent to the gNB.

9. After the gNB receives the PATH SWITCH REQUEST RESPONSE message sent by the AMF, a UE CONTEXT RELEASE message, i.e., a UE context release message, may be sent to the Last Serving gNB.

In the related art, when in the Inactive state, if there is a small packet/small data to be transmitted, the terminal needs to be converted from the Inactive state to the Connected state first, then establishes a connection with the control plane and the user plane on the network side, and then sends the data. In order to reduce the time delay and signaling overhead, research work on uplink small data transmission Small Data Transmission (SDT) is performed, and the purpose of the research work is to reduce the access time delay of a terminal for transmitting an uplink small data packet in an Inactive state, and support the SDT based on RACH (Random Access Channel ) and the SDT based on Configurable Grant (CG).

On the other hand, for a terminal in a connected state (hereinafter referred to as a connected state terminal), NR system downlink scheduling supports Semi-continuous scheduling/Semi-continuous scheduling (Semi-Persistent Scheduling, SPS). In the SPS process, the gNB configures a period of downlink SPS resources and a CS-RNTI (Configured Scheduling-Radio Network Temporary Identity, configured with a scheduling-radio network temporary identity) through the RRC layer, and the base station transmits a PDCCH (Physical Downlink Control Channel, downlink physical control channel/downlink physical control channel) scrambled by the CS-RNTI, for activating SPS transmission and indicating resources used for SPS first transmission. The UE determines whether the downlink SPS is activated or not and the resource position corresponding to the subsequent downlink SPS by monitoring the PDCCH.

Specifically, SPS-Config (semi-persistent scheduling configuration) information elements (information element, IE) of the RRC layer configuration are as follows:

however, at present, inactive small data transmission only supports uplink SDT transmission, and there is no mechanism for downlink SDT transmission.

In order to further reduce signaling overhead of inactive downlink small data transmission (downlink SDT), the following problems exist in supporting the above needs in the relevant specifications during the inactive downlink SDT:

inactive downlink small data transmission based on pre-configured grant (SPS) is not supported: at present, the non-active state uplink small data transmission based on configuration authorization (CG) is supported, but the non-active state downlink small data transmission process based on pre-configuration authorization is not supported, and the non-active state terminal can receive the downlink data transmission based on the pre-configuration authorization after being switched into a connection state, so that higher signaling overhead and higher power consumption are caused;

the configuration of transmitting the inactive downlink small data packet through the RRC release message is not supported: at present, the RRC release message does not contain the transmission configuration of the inactive state downlink small data packet, so that the inactive state terminal cannot receive the downlink small data more efficiently;

Activation/deactivation of the pre-configured grant inactive downlink small data transmission configuration resources is not supported by downlink control information (Downlink Control Information, DCI): at present, the network is not supported to issue downlink control information for activating/deactivating the pre-configured authorized resource to the non-activated state terminal, so that the non-activated state terminal cannot receive the downlink small data packet more efficiently, and higher signaling overhead and power consumption are caused.

Based on the above requirement and reason analysis, the related technology cannot meet the requirement, and needs to be enhanced by a new way to meet the requirement of network deployment and optimization.

In order to reduce signaling overhead and power consumption of inactive downlink data transmission, an embodiment of the present disclosure proposes an efficient inactive downlink data transmission method. The network configures resources for receiving the downlink small data in the inactive state in advance for the terminal, when the network has the downlink small data to be transmitted to the terminal in the inactive state (hereinafter referred to as the inactive state terminal), the configured downlink transmission resources are activated, the inactive state terminal receives the downlink data based on the activated downlink configuration resources, signaling overhead and power consumption caused by the fact that the inactive state terminal must be switched to a connection state to receive the downlink data are reduced, and the inactive state downlink data transmission efficiency is improved.

As shown in fig. 2, the embodiment of the present disclosure provides a downlink data transmission method, where the method provided in the embodiment of fig. 2 may be performed by a network device, and the network device may be, for example, a base station, but the present disclosure is not limited thereto, and the method provided in the embodiment of the present disclosure may include:

in S210, a radio resource control release message (RRC release message) is sent to a terminal, where the radio resource control release message may include inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information may be used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information may include preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information may be used to configure semi-persistent scheduling resources for transmitting inactive downlink small data.

In an exemplary embodiment, the inactive downlink small data transmission configuration information may further include: the inactive downlink small data transmission data radio bearer list may be used to indicate a data radio bearer identifier configured for downlink small data transmission.

In an exemplary embodiment, the pre-configured grant semi-persistent scheduling configuration information may include at least one of:

the period can indicate the period of semi-persistent scheduling resources for inactive downlink small data transmission;

the number of hybrid automatic repeat request processes can be used for indicating the number of hybrid automatic repeat request processes for non-active downlink small data transmission based on semi-persistent scheduling;

physical uplink control channel resources, which may be used to indicate hybrid automatic repeat request resources of a physical uplink control channel for non-active downlink small data transmission based on semi-persistent scheduling;

the modulation and coding strategy table can indicate the modulation and coding strategy table of inactive downlink small data transmission based on semi-persistent scheduling;

the configuration scheduling wireless network temporary identifier can be used for identifying pre-configuration authorization semi-persistent scheduling configuration information for inactive downlink small data transmission.

In an exemplary embodiment, transmitting the radio resource control release message to the terminal may include: acquiring the supporting capability of the terminal for the transmission of the downlink small data in the inactive state; and when detecting that the traffic of the terminal in the connected state is reduced, sending the wireless resource control release message to the terminal. The radio resource control release message may be used to instruct the terminal to enter an inactive state, and the radio resource control release message may include suspension configuration information, and the suspension configuration information may include downlink small data transmission configuration information in the inactive state.

In an exemplary embodiment, the radio resource control release message may not include the suspension configuration information when the network device redirects the terminal to an inter-radio access technology carrier frequency or configures a dual active protocol stack bearer for the terminal.

In an exemplary embodiment, the suspension configuration information may further include at least one of:

completely inactive state terminal identification;

truncating the inactive state terminal identifier;

a radio paging cycle;

wirelessly notifying area information;

a timer;

the next hop count value.

In an exemplary embodiment, the completely inactive state terminal identifier may be used to represent a radio network temporary identifier value of the terminal in an inactive state, where the size of the terminal is a first bit number, and the terminal identifier is used for searching an anchor base station and a stored terminal context of the terminal before the terminal enters a radio resource control inactive state by a target network side;

the truncated inactive state terminal identifier may be used to represent a radio network temporary identifier value of the terminal in an inactive state, where the size of the terminal is a second bit number, and the second bit number is smaller than the first bit number, and is used for searching an anchor point base station and a stored terminal context of the terminal before the terminal enters a radio resource control inactive state by a target network side;

The radio paging cycle may be used to represent a radio paging cycle configured by the network device for the terminal in an inactive state;

a timer may be used to trigger a periodic notification area update procedure in the terminal;

the next hop count value may be used to calculate a security key after future restoration of the connection by the terminal.

In an exemplary embodiment, when the suspension configuration information further includes wireless notification area information, the wireless notification area information may include at least one of:

a cell list, which may be used to indicate a cell list configured as a wireless region;

the wireless zone configuration list may be used to indicate a wireless zone code or a routing area code for the wireless zone.

In S220, when the network device has downlink small data to transmit to the terminal in the inactive state, a first downlink control signaling is sent to the terminal, where the first downlink control signaling may be used to activate the preconfigured resource for receiving the inactive downlink small data, which is issued by the terminal in the inactive state.

In an exemplary embodiment, sending the first downlink control signaling to the terminal may include: setting a downlink small data transmission threshold value in an inactive state; when the downlink data quantity of the downlink data to be transmitted is smaller than the inactive state downlink small data transmission threshold value, determining the downlink data as the downlink small data; and sending the first downlink control signaling to the terminal so as to initiate an inactive state downlink small data transmission process to the terminal in an inactive state.

In an exemplary embodiment, the method may further include: and when the downlink data quantity of the downlink data is larger than or equal to the inactive state downlink small data transmission threshold value, initiating a connection state downlink data transmission process to the terminal.

For periodic service, the downlink data amount of the downlink data may refer to a single-period downlink data amount.

In an exemplary embodiment, the method may further include: receiving downlink data to be transmitted and downlink data configuration information from a core network; and determining whether to send the first downlink control signaling to the terminal according to the downlink data configuration information and the inactive downlink small data transmission threshold.

In an exemplary embodiment, the downlink data configuration information may include at least one of:

the downlink data service type can be used for indicating whether the service corresponding to the downlink data is a periodic service or not;

the downlink service period can be used for indicating the service period corresponding to the downlink data;

downlink data volume, if the service corresponding to the downlink data is a periodic service, the downlink data volume may represent a single period downlink data volume; if the service corresponding to the downlink data is an aperiodic service, the downlink data volume may represent the overall data volume of the service corresponding to the downlink data;

The terminal identifier of the terminal can be used for identifying the terminal receiving the downlink data.

In an exemplary embodiment, determining whether to send the first downlink control signaling to the terminal according to the downlink data configuration information and the inactive downlink small data transmission threshold may include: when the downlink data configuration information indicates that the service corresponding to the downlink data is an aperiodic service, and the downlink data amount of the aperiodic service is greater than or equal to the downlink small data transmission threshold in the inactive state; or when the downlink data configuration information indicates that the service corresponding to the downlink data is a periodic service, and the single-period downlink data volume of the periodic service is greater than or equal to the inactive state downlink small data transmission threshold, determining not to send the first downlink control signaling to the terminal, and initiating a radio resource control connection recovery process to the terminal in the inactive state; and transmitting the downlink data to the terminal after the terminal in the inactive state is switched into the connected state.

In an exemplary embodiment, determining whether to send the first downlink control signaling to the terminal according to the downlink data configuration information and the inactive downlink small data transmission threshold may include: and when the downlink data configuration information indicates that the service corresponding to the downlink data is an aperiodic service and the downlink data quantity of the aperiodic service is smaller than the downlink small data transmission threshold in the inactive state, determining to send the first downlink control signaling to the terminal so as to initiate a downlink small data transmission process in the inactive state to the terminal.

In an exemplary embodiment, determining whether to send the first downlink control signaling to the terminal according to the downlink data configuration information and the inactive downlink small data transmission threshold may include: when the downlink data configuration information indicates that the service corresponding to the downlink data is a periodic service, and the single-period downlink data amount of the periodic service is smaller than the downlink small data transmission threshold value in the inactive state, determining that the downlink control signaling is sent to the terminal in the inactive state based on the downlink service period in the downlink data configuration information and the pre-configuration authorization semi-persistent scheduling configuration information, so as to initiate an inactive state downlink small data packet transmission process based on the pre-configuration authorization semi-persistent scheduling to the terminal in the inactive state.

In an exemplary embodiment, the radio resource control release message may further include a radio paging cycle.

Wherein, before sending the first downlink control signaling to the terminal, the method may further include: and sending a paging message to the terminals according to the wireless paging cycle in the wireless resource control release message, wherein the paging message can be used for addressing at least one terminal, and each terminal is addressed through a paging record.

Wherein, the paging message may include:

a paging record list for recording a list of terminals to be paged;

and (3) paging records less than or equal to M, wherein M is a positive integer greater than or equal to 1.

In an exemplary embodiment, each paging record may include at least one of:

the terminal identifier of the terminal is used for indicating the identifier of the terminal to be paged;

an access type that may be used to indicate whether paging messages originated by protocol data unit sessions that are not third generation partnership project access;

the inactive downlink data transmission indication can be used for indicating that the corresponding paging message is used for triggering the inactive downlink data transmission;

a non-contention random access preamble may be used to instruct the terminal to initiate non-contention random access.

In an exemplary embodiment, the terminal identification of the terminal may include at least one of:

the non-access layer identifier can be used for indicating the identifier allocated to the terminal by the non-access layer and used for paging a core network;

the completely inactive state terminal identification may be used to indicate the identification of the terminal in the radio resource control inactive state for radio paging.

In an exemplary embodiment, the method may further include: if the paging message comprises a non-contention random access preamble, receiving the non-contention random access preamble sent by the terminal; if the paging message does not include the non-contention random access preamble, receiving the contention random access preamble sent by the terminal; and after receiving the non-contention random access preamble or the contention random access preamble, transmitting a reply message to the terminal, wherein the reply message comprises configuration information.

Wherein the configuration information may include at least one of a timing advance, an uplink resource allocation grant, and a temporary cell radio network temporary identity.

In an exemplary embodiment, the method may further include: and receiving a radio resource control recovery request message sent by the terminal. Wherein the radio resource control recovery request message may include at least one of:

the recovery identifier can be used for identifying the inactive state terminal identification value;

recovering an integrity check code, which is a bit string, and which can be used for the network device to perform an authentication token for authentication of the terminal;

the reason is recovered.

In an exemplary embodiment, the restoration reason may include a restoration reason information element, which is of an enumerated type, and may include at least one of the following:

an emergency call;

high priority access;

accessing a mobile terminal;

signaling by a mobile terminal;

mobile terminal data;

a mobile terminal voice call;

a mobile terminal video call;

the mobile terminal instant short message service;

wireless notification of an area update;

accessing the multimedia priority;

important task access;

and transmitting the downlink small data in an inactive state.

In an exemplary embodiment, sending the first downlink control signaling to the terminal may include: after receiving the radio resource control recovery request message, determining that downlink data to be transmitted is periodic data, and determining that the downlink data is downlink small data if the single-period downlink data amount is smaller than an inactive downlink small data transmission threshold value; and when the service characteristics of the downlink small data are determined to be matched with the pre-configuration authorization semi-persistent scheduling configuration information, sending the first downlink control signaling scrambled by the configuration scheduling wireless network temporary identifier to the terminal so as to activate the pre-configuration resource for transmitting the non-activated downlink small data based on the pre-configuration authorization semi-persistent scheduling, which is issued by the terminal.

In an exemplary embodiment, the pre-configured grant semi-persistent scheduling configuration information may include a period of semi-persistent scheduling resources for inactive downlink data transmission; the service characteristic of the downlink small data may include a downlink service period of the downlink small data.

Wherein the method may further comprise: and when the downlink service period of the downlink small data is matched with the period of the semi-persistent scheduling resource for inactive downlink data transmission, determining that the service characteristic of the downlink small data is matched with the pre-configuration authorization semi-persistent scheduling configuration information.

In S230, the downlink small data is sent to the terminal in the inactive state on the preconfigured resource.

In an example embodiment, the pre-configured grant semi-persistent scheduling configuration information may include physical uplink control channel resources.

Wherein the method may further comprise: and receiving a feedback message sent by the terminal through the physical uplink control channel resource in the pre-configuration authorization semi-persistent scheduling configuration information.

In an exemplary embodiment, sending the downlink small data to the terminal in the inactive state on the preconfigured resource may include: and after receiving the feedback message sent by the terminal in the inactive state, sending the downlink small data to the terminal in the inactive state through pre-configuring authorized semi-persistent scheduling resources.

In an exemplary embodiment, the method provided by the embodiment of the present disclosure may further include: and if the feedback message sent by the terminal in the inactive state is not received, retransmitting a first downlink control signaling for activating the pre-configured resource for inactive state downlink small data transmission based on pre-configured authorization semi-persistent scheduling to the terminal.

In S240, after the downlink small data is transferred to the terminal in the inactive state, a second downlink control signaling is sent to the terminal, where the second downlink control signaling may be used to deactivate the pre-configured resource for inactive state downlink small data transmission based on semi-persistent scheduling issued for the terminal.

Wherein after the downlink small data is transferred to the terminal in the inactive state, sending a second downlink control signaling to the terminal may include: and after the periodic downlink small data is transferred to the terminal in the inactive state, sending the second downlink control signaling scrambled by the configured scheduling wireless network temporary identifier to the terminal so as to be used for deactivating the pre-configured resource for the inactive state downlink small data transmission based on pre-configured authorization semi-persistent scheduling, which is issued by the terminal.

The embodiment of the disclosure provides a high-efficiency inactive downlink data transmission method. In the embodiment of the disclosure, the network issues a preconfigured resource for receiving the inactive downlink small data to the terminal through an RRC release message, where the preconfigured resource may include a semi-persistent scheduling resource for transmitting the inactive downlink small data; when the network has downlink data to be transmitted to the inactive state terminal, the network activates the pre-configured resource for receiving the inactive state downlink small data, which is issued by the inactive state terminal, through a downlink control signaling (for distinction, referred to as a first downlink control signaling); and then, the network transmits downlink small data packets/downlink small data to the non-active terminal on the pre-configured resource, and after the transmission of the downlink small data packets/downlink small data is completed, the network deactivates the non-active downlink transmission resource which is transmitted by the terminal and is based on semi-persistent scheduling through a downlink control command/signaling (for distinction, referred to as a second downlink control signaling).

The solution proposed by the embodiment of the present disclosure may be oriented to a periodic downlink small data transmission service, and the following describes an inactive downlink small data transmission (MT-SDT) procedure by way of example with reference to fig. 3, but the present disclosure is not limited thereto.

S1: the network (for example, the last service gNB in fig. 3) pre-acquires the supporting capability of the terminal (UE) for the inactive downlink small data transmission (MT-SDT); then, when the traffic of the connected terminal decreases, the network sends an RRC release message to the terminal, and instructs the terminal to enter the inactive state, where the RRC release message may include suspension configuration information, and the suspension configuration information may include configuration information for inactive downlink small data transmission (MT-SDT) (i.e., inactive downlink small data transmission configuration information).

Wherein the network may not configure the suspension configuration information for the terminal when the network redirects the terminal to an inter-RAT (Radio Access Technology, radio access technology/radio access technology) carrier frequency or configures a DAPS (Dual Active Protocol Stack ) bearer for the terminal.

Specifically, the suspension configuration information of the RRC release message may include, but is not limited to, the following information:

-a fully inactive UE identity (full I-RNTI): the radio network temporary identification value representing the terminal in the inactive state may be, for example, 40 bits (first bit number) in size. The method is used for searching gNB (i.e. anchor node/anchor base station) before the UE enters the RRC inactive state by the target network side and the stored UE context thereof;

-truncating the inactive state UE identity (short I-RNTI): the radio network temporary identification value representing the inactive terminal may be, for example, 24 bits (second bit number). The method is used for searching gNB (i.e. anchor node/anchor base station) before the UE enters the RRC inactive state by the target network side and the stored UE context thereof;

-radio paging cycle: i.e., a RAN paging cycle configured by the RAN-side node to the inactive state terminal, where the cycle may include 32 radio frames, 64 radio frames, 128 radio frames, 256 radio frames, etc., for example, 32 radio frames are taken as an example below;

-Radio (RAN) notification area information, which may include, but is not limited to, the following:

cell list: a cell list configured as a RAN area;

-wireless zone configuration list: RAN area code or RA (route area) code of the RAN area;

-a timer: refers to a timer that triggers a periodic RNAU (notification area update, U is shorthand for update) procedure in the UE;

-a next hop chain count value: the method comprises the steps of calculating a security key after future recovery connection;

-inactive downlink small data transfer (Mobile Terminated Small data transmission, MT-SDT) configuration information, which may include, but is not limited to, the following information:

-list of inactive downstream SDT (MT-SDT) DRBs (data radio bearer, data radio bearers): DRB identification indicating to configure for downlink SDT, if the sequence size is 0, the terminal considers that the network does not configure DRB for downlink SDT transmission

-pre-configuration grant semi-persistent scheduling configuration (DL-SPS) information: semi-persistent scheduling resources for inactive downlink small data transmissions may include, but are not limited to, the following information:

-period: the period of the semi-persistent scheduling resource for the inactive downlink small data transmission may be specifically 10ms,20ms,32ms,40ms,64ms,80ms,128ms,160ms,320ms,640ms, etc., for example, the period is 10ms below.

Number of HARQ (Hybrid Automatic Repeat Request ) processes: the HARQ process number is used for indicating the inactive state downlink small data transmission based on semi-persistent scheduling;

PUCCH (Physical Uplink Control Channel, physical uplink control channel/physical uplink control channel) resource: HARQ resources for PUCCH indicating inactive state downlink small data transmission based on semi-persistent scheduling;

-MCS (Modulation and Coding Scheme, modulation and coding strategy) table: an MCS table indicating inactive state downlink small data transmission for semi-persistent scheduling;

-configuring a scheduling radio network temporary identity (Configured Scheduling-RNTI, CS-RNTI): and the semi-persistent scheduling configuration information is used for identifying the semi-persistent scheduling configuration information for inactive downlink small data transmission.

S2: and after receiving the RRC release message sent by the last service gNB, the UE enters an RRC inactive state.

S3: the last serving gNB receives the downlink Data (DL Data) to be transmitted from the 5GC (5G core network).

S4: the last serving gNB makes a downstream SDT Selection (DL SDT Selection).

Optionally, if the downlink data amount of the downlink data to be transmitted is smaller than a threshold (called an inactive downlink small data transmission threshold) set in advance for MT-SDT by the network, the MT-SDT procedure is initiated.

Specifically, the network sets a threshold value for the downlink small data transmission in the inactive state in advance (called an inactive state downlink small data transmission threshold value), and when the downlink data volume is smaller than the threshold value, initiates the downlink small data transmission process in the inactive state, otherwise, initiates the connection state downlink small data transmission process. Wherein for periodic traffic, the downlink data volume refers to a single period downlink data volume.

Optionally, the network receives downstream data and associated configuration information (referred to as downstream data configuration information) from the core network.

Specifically, to achieve more efficient downlink data transmission, the network may acquire configuration information related to downlink data (referred to as downlink data configuration information) from the core network in addition to receiving the downlink data from the core network, and may include, but is not limited to, the following information:

-downstream data traffic type: indicating whether the service is a periodic service;

downlink traffic cycle: if so, representing a service period;

downlink data amount: if periodic traffic, the data amount in each period (namely, single-period downlink data amount) is represented; if the service is non-periodic, the whole data volume of the service is represented;

-UE identity: for identifying the terminals that need to receive the downstream data.

The network can judge whether to initiate the inactive state downlink small data transmission process for the inactive state terminal according to the configuration information related to the downlink data issued by the core network, the capability information of the terminal for the inactive state downlink small data transmission and a pre-configured threshold value:

for example, when the downlink data amount of the non-periodic service is greater than or equal to a preset specific threshold (if the downlink data amount in a single period is greater than or equal to the preset specific threshold), the network initiates an RRC connection recovery procedure to the inactive state terminal, and after the inactive state terminal is switched to a connected state, downlink data transmission is performed.

For another example, when the downlink data amount of the aperiodic service is smaller than a preset specific threshold, the network initiates an inactive downlink small data transmission MT-SDT procedure for the terminal.

For another example, when the downlink data amount in a single period of the periodic service is smaller than a specific pre-configured threshold, the network may initiate an inactive downlink small data packet transfer process based on pre-configured semi-persistent scheduling for the inactive terminal based on information such as the downlink service period and pre-configured authorized semi-persistent scheduling configuration information.

S5: in order to initiate an inactive state downlink small data transmission procedure to an inactive state terminal, the network may initiate a paging (paging) procedure to the terminal.

In particular, the network may send paging messages to the terminals according to the radio paging cycle in the RRC release message, and the network may address multiple terminals through one paging message, where each terminal is addressed through one paging record.

In the embodiment of the present disclosure, the paging message sent by the network may include, but is not limited to, the following information:

-list of paging records: the list of the paged UE is recorded, which may specifically include at most M paging records, where M is a positive integer greater than or equal to 1;

Paging records, which may include, but are not limited to, the following information:

-UE identity: the identity indicating the paged UE may include, but is not limited to, the following information:

-NAS layer ID: the NAS layer distributes the ID of the UE for paging of the core network;

-fully inactive UE identity (full I-RNTI): an ID of the rrc_inactive mode UE for RAN paging;

-access type: paging message initiated by PDU (Protocol Data Unit ) session indicating whether it is accessed by non-3 GPP (3 rd Generation Partnership Project, third Generation partnership project)

-an inactive state downlink data transfer (MT-SDT) indication: indicating that the paging message is used to trigger inactive downlink data transmission

-non-contention random access preamble: if so, the network allocates a non-contention random access preamble to the terminal, and the terminal can initiate non-contention random access.

S6: the terminal initiates a recovery request for the MT-SDT.

S7: after receiving the paging message sent by the network, the terminal sends a Preamble (Preamble) to the network through Msg1 (message 1), where the Preamble may include a non-contention random access Preamble and a contention random access Preamble. Wherein, if the paging message contains a non-contention random access preamble, the non-contention random access preamble is sent to the network; otherwise, the terminal sends the contention random access preamble to the network.

After the network receives the non-contention random access preamble or the contention random access preamble sent by the non-active state terminal, the network can send out configuration information such as a timing advance, an uplink resource (PUSCH resource) allocation grant, a Temporary cell radio network Temporary identifier (Temporary C-RNTI) and the like to the terminal through the Msg2 (message 2) as a reply message.

S8: after receiving the reply message sent by the network, the terminal sends an RRC restoration request message to the network, where the RRC restoration request message may include, but is not limited to, the following contents:

-recovering the identity: an inactive UE identity value for facilitating UE context information retrieval at the gNB, e.g., resumeIdentify for RRCResumRequest 1;

-recovering the integrity check code: a bit string for an authentication token, such as resumeMAC-I, for UE authentication at the gNB;

-restoration cause: an upper layer or an RRC-provided resume reason is added in the first RRC connection resume request message (RRCResumRequest 1). When the UE uses an unknown cause value, the gNB does not reject the first RRC connection resume request, such as resumecase;

-recovery cause IE (information element): enumeration types, including emergency call, highpriority Access, mt-Access, mo-signaling, mo-Data, mo-VoiceCall, mo-video call, mo-SMS, rn-Update, mps-priority Access, mcs-priority Access, mt-sdt, etc.

S8: and after the network receives the RRC recovery request (RRC Resume Request) message sent by the inactive state terminal, initiating an inactive state downlink small data transmission MT-SDT process for the inactive state terminal.

Specifically, when the network finds that the sent downlink data is periodic data, and the downlink data amount in a single period (single period downlink data amount) is smaller than a specific threshold, and the service characteristic of the downlink data is matched with the pre-configured authorized semi-persistent scheduling resource issued in the RRC release message (for example, the downlink data period (or downlink service period) is matched with the period of the semi-persistent scheduling resource, etc.), the network initiates an inactive downlink small data packet transfer process based on the pre-configured authorized semi-persistent scheduling for the inactive terminal.

For example, the network first sends downlink control information scrambled by the CS-RNTI to the terminal to activate inactive state downlink data transmission configuration resources based on pre-configured grant semi-persistent scheduling issued by the terminal. To activate SPS-based MT-SDT resources issued for the terminal.

S9: after receiving the downlink control information scrambled by the CS-RNTI issued by the network, the terminal sends a feedback message ACK to the network through a PUCCH resource in the pre-configured grant semi-persistent scheduling (SPS) configuration so as to activate the downlink SPS configuration (active DL SPS config).

In S9, the downlink control information issued by the network may be included in the PDCCH.

S10: after the network receives the ACK message sent by the non-active terminal, sending a downlink small Data packet/downlink small Data (DL Data) for the non-active terminal through pre-configuring authorized semi-persistent scheduling resources (SPS resources); otherwise, if the network does not receive the ACK message fed back by the inactive state terminal, the network re-transmits downlink control information for activating inactive state downlink small data transmission (MT-SDT) configuration resources based on pre-configured semi-persistent scheduling (SPS) to the terminal.

S11: after the transmission of the periodic downlink small data packet/downlink small data is completed, the network issues downlink control information scrambled by the CS-RNTI for the terminal to deactivate the configuration resource (deactive DL SPS config) of the inactive downlink small data transmission (MT-SDT) based on the pre-configuration authorization semi-persistent scheduling (SPS) issued for the terminal.

In S11, the downlink control information issued by the network may be included in the PDCCH.

According to the method provided by the embodiment of the disclosure, on one hand, the downlink small data transmission in the inactive state based on the pre-configuration authorization is supported, the terminal in the inactive state does not need to be switched into the connection state, and the downlink data transmission based on the pre-configuration authorization of the network can be received, so that signaling overhead and power consumption are saved. On the other hand, the support base station transmits the transmission configuration of the inactive state downlink small data packet through the RRC release message, so that the inactive state terminal can receive the downlink small data more efficiently. Meanwhile, the activation/deactivation of the pre-configuration authorized inactive state downlink small data transmission configuration resources is also supported through the downlink control information, so that the inactive state terminal can receive the downlink small data packets more efficiently, and signaling overhead and power consumption are saved.

As shown in fig. 4, a downlink data transmission method provided by an embodiment of the present disclosure may be performed by a terminal, where the method provided by the embodiment of the present disclosure may include:

in S410, a radio resource control release message sent by a network device is received, where the radio resource control release message may include inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information may be used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information may include preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information may be used to configure semi-persistent scheduling resources for transmitting inactive downlink small data.

In S420, a first downlink control signaling sent by the network device is received.

In S430, the first downlink control signaling is responded to enter an inactive state, and the pre-configured resource for receiving the inactive downlink small data, which is issued by the terminal in the inactive state, is activated.

In S440, the downlink small data sent by the network device is received on the preconfigured resource.

In S450, after receiving the downlink small data, a second downlink control signaling sent by the network device is received.

In S460, the pre-configured resource for non-active downlink small data transmission based on semi-persistent scheduling issued by the terminal is deactivated in response to the second downlink control signaling.

Other content of embodiments of the present disclosure may be found in the description of other embodiments described above.

Fig. 5 schematically illustrates a block diagram of a network device according to an embodiment of the disclosure. As shown in fig. 5, a network device 500 provided by an embodiment of the present disclosure may include a transmitting unit 510.

The sending unit 510 may be configured to send a radio resource control release message to a terminal, where the radio resource control release message may include inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information may be used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information may include preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information may be used to configure semi-persistent scheduling resources for transmitting inactive downlink small data.

The sending unit 510 may be further configured to send a first downlink control signaling to the terminal when the network device has downlink small data to transmit to the terminal in the inactive state, where the first downlink control signaling may be used to activate the preconfigured resource for receiving the downlink small data in the inactive state, which is issued by the terminal in the inactive state.

The sending unit 510 may be further configured to send the downlink small data to the terminal in the inactive state on the preconfigured resource.

The sending unit 510 may be further configured to send a second downlink control signaling to the terminal after the downlink small data is transferred to the terminal in the inactive state, where the second downlink control signaling may be used to deactivate the pre-configured resource for inactive state downlink small data transmission based on semi-persistent scheduling issued for the terminal.

Other content of the embodiment of fig. 5 may be referred to the other embodiments described above.

As shown in fig. 6, a terminal 600 provided by an embodiment of the present disclosure may include a receiving unit 610 and a processing unit 620.

The receiving unit 610 may be configured to receive a radio resource control release message sent by a network device, where the radio resource control release message may include inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information may be used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, where the inactive downlink small data transmission configuration information includes preconfigured authorized semi-persistent scheduling configuration information, and where the preconfigured authorized semi-persistent scheduling configuration information is used to configure semi-persistent scheduling resources for transmitting downlink small data in an inactive state.

The receiving unit 610 may be further configured to receive a first downlink control signaling sent by the network device.

The processing unit 620 may be configured to enter an inactive state in response to the first downlink control signaling, and activate the pre-configured resource for receiving downlink small data in the inactive state, which is issued by the terminal in the inactive state.

The receiving unit 610 may be further configured to receive, on the preconfigured resource, the downlink small data sent by the network device.

The receiving unit 610 may be further configured to receive a second downlink control signaling sent by the network device after receiving the downlink small data.

The processing unit 620 may be further configured to deactivate the preconfigured resource for inactive downlink small data transmission based on semi-persistent scheduling issued for the terminal in response to the second downlink control signaling.

Other content of the embodiment of fig. 6 may be referred to the other embodiments described above.

It should also be understood that the sequence numbers of the above processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure.

It is also to be understood that in the various embodiments of the disclosure, terms and/or descriptions of the various embodiments are consistent and may be referenced to one another in the absence of a particular explanation or logic conflict, and that the features of the various embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.

Fig. 7 illustrates a communication device 700 in an embodiment of the disclosure, which may include a processor 710, a memory 720, and a transceiver 730, where the processing units in the above embodiments may be implemented by the processor 710, the receiving units and the transmitting units in the above embodiments may be implemented by the transceiver 730, and the storage units may be implemented by the memory 720.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present disclosure may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present disclosure may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form.

The embodiment of the disclosure also provides a communication system, which comprises the network equipment and the terminal.

The disclosed embodiments also provide a computer readable medium having stored thereon a computer program which, when executed by a computer, implements the downstream data transmission method in any of the method embodiments described above.

The disclosed embodiments also provide a computer program product which, when executed by a computer, implements the downstream data transmission method in any of the method embodiments described above.

The embodiment of the disclosure also provides a system chip, which comprises: a processing unit, which may be, for example, a processor, and a communication unit, which may be, for example, an input/output interface, pins or circuitry, etc. The processing unit may execute computer instructions to cause a chip within the network communication device to perform any of the downstream data transmission methods provided by the embodiments of the present disclosure described above.

Optionally, the computer instructions are stored in a storage unit.

Alternatively, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the terminal located outside the chip, such as a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM), etc. The processor mentioned in any of the above may be a CPU, microprocessor, ASIC, or one or more integrated circuits for controlling the execution of the programs of the downstream data transmission method described above. The processing unit and the storage unit may be decoupled and respectively disposed on different physical devices, and the respective functions of the processing unit and the storage unit are implemented by wired or wireless connection, so as to support the system chip to implement the various functions in the foregoing embodiments. Alternatively, the processing unit and the memory may be coupled to the same device.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present disclosure are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present disclosure, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation of the embodiments of the present disclosure.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A method of downlink data transmission, the method performed by a network device, the method comprising:

transmitting a radio resource control release message to a terminal, wherein the radio resource control release message comprises inactive state downlink small data transmission configuration information, the inactive state downlink small data transmission configuration information is used for configuring pre-configured resources for receiving downlink small data transmitted by the network equipment when the terminal is in an inactive state, the inactive state downlink small data transmission configuration information comprises pre-configured authorized semi-persistent scheduling configuration information, and the pre-configured authorized semi-persistent scheduling configuration information is used for configuring semi-persistent scheduling resources for transmitting the inactive state downlink small data;

When the network equipment transmits downlink small data to the terminal in an inactive state, a first downlink control signaling is sent to the terminal, wherein the first downlink control signaling is used for activating the pre-configured resource which is sent by the terminal in the inactive state and used for receiving the downlink small data in the inactive state;

transmitting the downlink small data to the terminal in an inactive state on the pre-configured resource;

and after the downlink small data is transmitted to the terminal in the inactive state, sending a second downlink control signaling to the terminal, wherein the second downlink control signaling is used for deactivating the pre-configured resource for the transmission of the inactive state downlink small data based on semi-persistent scheduling, which is issued for the terminal.

2. The method of claim 1, wherein the inactive downlink small data transmission configuration information further comprises:

and the inactive downlink small data transmission data radio bearer list is used for indicating the data radio bearer identification configured for downlink small data transmission.

3. The method of claim 1, wherein the pre-configured grant semi-persistent scheduling configuration information comprises at least one of:

A period indicating a period of semi-persistent scheduling resources for inactive downlink small data transmission;

the number of hybrid automatic repeat request processes is used for indicating the number of hybrid automatic repeat request processes of inactive downlink small data transmission based on semi-persistent scheduling;

physical uplink control channel resources for indicating hybrid automatic repeat request resources of a physical uplink control channel for non-active downlink small data transmission based on semi-persistent scheduling;

a modulation and coding strategy table indicating a modulation and coding strategy table for inactive downlink small data transmission based on semi-persistent scheduling;

and configuring a scheduling wireless network temporary identifier, wherein the scheduling wireless network temporary identifier is used for identifying pre-configured authorized semi-persistent scheduling configuration information for inactive downlink small data transmission.

4. The method of claim 1, wherein transmitting the radio resource control release message to the terminal comprises:

acquiring the supporting capability of the terminal for the transmission of the downlink small data in the inactive state;

when detecting that the traffic of the terminal in a connected state is reduced, sending the wireless resource control release message to the terminal;

the radio resource control release message is used for indicating the terminal to enter a non-activated state, the radio resource control release message comprises suspension configuration information, and the suspension configuration information comprises the non-activated state downlink small data transmission configuration information.

5. The method of claim 4, wherein the radio resource control release message does not include the suspension configuration information when the network device redirects the terminal to an inter-radio access technology carrier frequency or configures a dual active protocol stack bearer for the terminal.

6. The method of claim 4, wherein the suspension configuration information further comprises at least one of:

completely inactive state terminal identification;

truncating the inactive state terminal identifier;

a radio paging cycle;

wirelessly notifying area information;

a timer;

the next hop count value.

7. The method according to claim 6, wherein:

the completely inactive state terminal identifier is used for indicating a radio network temporary identifier value of the terminal in an inactive state, the size of the radio network temporary identifier value is a first bit number, and the radio network temporary identifier value is used for searching an anchor point base station before the terminal enters a radio resource control inactive state and a stored terminal context of the anchor point base station;

shortening the radio network temporary identification value of the terminal in the inactive state, wherein the radio network temporary identification value is in the inactive state, the size of the radio network temporary identification value is a second bit number, and the second bit number is smaller than the first bit number, and the radio network temporary identification value is used for searching an anchor point base station before the terminal enters the radio resource control inactive state and a stored terminal context of the anchor point base station by a target network side;

The radio paging cycle is used for representing the radio paging cycle configured by the network equipment for the terminal in the inactive state;

the timer is used for triggering a periodical notification area update process in the terminal;

the next hop count value is used for calculating a security key after the terminal recovers the connection in the future.

8. The method of claim 6, wherein when the suspension configuration information further includes wireless notification area information, the wireless notification area information includes at least one of:

a cell list for indicating a cell list configured as a wireless area;

a wireless area configuration list for indicating wireless area codes or routing area codes of the wireless area.

9. The method of claim 1, wherein transmitting the first downlink control signaling to the terminal comprises:

setting a downlink small data transmission threshold value in an inactive state;

when the downlink data quantity of the downlink data to be transmitted is smaller than the inactive state downlink small data transmission threshold value, determining the downlink data as the downlink small data;

and sending the first downlink control signaling to the terminal so as to initiate an inactive state downlink small data transmission process to the terminal in an inactive state.

10. The method as recited in claim 9, further comprising:

when the downlink data volume of the downlink data is larger than or equal to the inactive state downlink small data transmission threshold value, initiating a connection state downlink data transmission process to the terminal;

for periodic service, the downlink data amount of the downlink data refers to single-period downlink data amount.

11. The method as recited in claim 1, further comprising:

receiving downlink data to be transmitted and downlink data configuration information from a core network;

and determining whether to send the first downlink control signaling to the terminal according to the downlink data configuration information and the inactive downlink small data transmission threshold.

12. The method of claim 11, wherein the downstream data configuration information comprises at least one of:

the downlink data service type is used for indicating whether the service corresponding to the downlink data is a periodic service or not;

a downlink service period for indicating a service period corresponding to the downlink data;

downlink data amount, if the service corresponding to the downlink data is a periodic service, the downlink data amount represents a single period downlink data amount; if the service corresponding to the downlink data is an aperiodic service, the downlink data quantity represents the whole data quantity of the service corresponding to the downlink data;

And the terminal identifier of the terminal is used for identifying the terminal for receiving the downlink data.

13. The method of claim 11, wherein determining whether to send the first downlink control signaling to the terminal based on the downlink data configuration information and an inactive downlink small data transmission threshold comprises:

when the downlink data configuration information indicates that the service corresponding to the downlink data is an aperiodic service, and the downlink data amount of the aperiodic service is greater than or equal to the downlink small data transmission threshold in the inactive state; or when the downlink data configuration information indicates that the service corresponding to the downlink data is a periodic service, and the single-period downlink data volume of the periodic service is greater than or equal to the inactive state downlink small data transmission threshold, determining not to send the first downlink control signaling to the terminal, and initiating a radio resource control connection recovery process to the terminal in the inactive state;

and transmitting the downlink data to the terminal after the terminal in the inactive state is switched into the connected state.

14. The method of claim 11, wherein determining whether to send the first downlink control signaling to the terminal based on the downlink data configuration information and an inactive downlink small data transmission threshold comprises:

And when the downlink data configuration information indicates that the service corresponding to the downlink data is an aperiodic service and the downlink data quantity of the aperiodic service is smaller than the downlink small data transmission threshold in the inactive state, determining to send the first downlink control signaling to the terminal so as to initiate a downlink small data transmission process in the inactive state to the terminal.

15. The method of claim 11, wherein determining whether to send the first downlink control signaling to the terminal based on the downlink data configuration information and an inactive downlink small data transmission threshold comprises:

when the downlink data configuration information indicates that the service corresponding to the downlink data is a periodic service, and the single-period downlink data amount of the periodic service is smaller than the downlink small data transmission threshold value in the inactive state, determining that the downlink control signaling is sent to the terminal in the inactive state based on the downlink service period in the downlink data configuration information and the pre-configuration authorization semi-persistent scheduling configuration information, so as to initiate an inactive state downlink small data packet transmission process based on the pre-configuration authorization semi-persistent scheduling to the terminal in the inactive state.

16. The method of claim 1, wherein the radio resource control release message further comprises a radio paging cycle;

wherein, before sending the first downlink control signaling to the terminal, the method further comprises:

sending a paging message to the terminals according to a radio paging cycle in the radio resource control release message, wherein the paging message is used for addressing at least one terminal, and each terminal is addressed through a paging record;

wherein the paging message includes:

a paging record list for recording a list of terminals to be paged;

17. The method of claim 16, wherein each paging record comprises at least one of:

an access type for indicating whether a paging message originated by a protocol data unit session that is not third generation partnership project access;

an inactive downlink data transmission indication, which is used for indicating that the corresponding paging message is used for triggering inactive downlink data transmission;

and the non-contention random access preamble is used for indicating the terminal to initiate non-contention random access.

18. The method of claim 17, wherein the terminal identification of the terminal comprises at least one of:

the non-access layer identifier is used for indicating the identifier allocated to the terminal by the non-access layer and used for paging a core network;

and the completely inactive state terminal identifier is used for indicating the identifier of the terminal in the inactive state of the radio resource control and is used for radio paging.

19. The method as recited in claim 17, further comprising:

if the paging message comprises a non-contention random access preamble, receiving the non-contention random access preamble sent by the terminal;

if the paging message does not include the non-contention random access preamble, receiving the contention random access preamble sent by the terminal;

after receiving the non-contention random access preamble or the contention random access preamble, transmitting a reply message to the terminal, wherein the reply message comprises configuration information;

wherein the configuration information includes at least one of a timing advance, an uplink resource allocation grant, and a temporary cell radio network temporary identity.

20. The method as recited in claim 19, further comprising:

Receiving a radio resource control recovery request message sent by the terminal, wherein the radio resource control recovery request message comprises at least one of the following:

a recovery identifier for identifying the inactive state terminal identification value;

recovering an integrity check code, which is a bit string, and is used for the network equipment to perform the authentication token of the terminal;

the reason is recovered.

21. The method of claim 20, wherein the restoration reason comprises a restoration reason information element, the restoration reason information element being of an enumerated type comprising at least one of:

an emergency call;

high priority access;

accessing a mobile terminal;

signaling by a mobile terminal;

mobile terminal data;

a mobile terminal voice call;

a mobile terminal video call;

the mobile terminal instant short message service;

wireless notification of an area update;

accessing the multimedia priority;

important task access;

and transmitting the downlink small data in an inactive state.

22. The method of claim 20, wherein transmitting the first downlink control signaling to the terminal comprises:

after receiving the radio resource control recovery request message, determining that downlink data to be transmitted is periodic data, and determining that the downlink data is downlink small data if the single-period downlink data amount is smaller than an inactive downlink small data transmission threshold value;

And when the service characteristics of the downlink small data are determined to be matched with the pre-configuration authorization semi-persistent scheduling configuration information, sending the first downlink control signaling scrambled by the configuration scheduling wireless network temporary identifier to the terminal so as to activate the pre-configuration resource for transmitting the non-activated downlink small data based on the pre-configuration authorization semi-persistent scheduling, which is issued by the terminal.

23. The method of claim 22, wherein the pre-configured grant semi-persistent scheduling configuration information includes a period of semi-persistent scheduling resources for inactive downlink data transmission; the service characteristics of the downlink small data comprise a downlink service period of the downlink small data;

wherein the method further comprises:

and when the downlink service period of the downlink small data is matched with the period of the semi-persistent scheduling resource for inactive downlink data transmission, determining that the service characteristic of the downlink small data is matched with the pre-configuration authorization semi-persistent scheduling configuration information.

24. The method of claim 23, wherein the pre-configured grant semi-persistent scheduling configuration information comprises physical uplink control channel resources;

Wherein the method further comprises:

and receiving a feedback message sent by the terminal through the physical uplink control channel resource in the pre-configuration authorization semi-persistent scheduling configuration information.

25. The method of claim 24, wherein transmitting the downlink small data to the terminal in an inactive state on the preconfigured resource comprises:

and after receiving the feedback message sent by the terminal in the inactive state, sending the downlink small data to the terminal in the inactive state through pre-configuring authorized semi-persistent scheduling resources.

26. The method as recited in claim 25, further comprising:

and if the feedback message sent by the terminal in the inactive state is not received, retransmitting a first downlink control signaling for activating the pre-configured resource for inactive state downlink small data transmission based on pre-configured authorization semi-persistent scheduling to the terminal.

27. The method according to claim 1, wherein after the downlink small data is transferred to the terminal in the inactive state, sending a second downlink control signaling to the terminal comprises:

And after the periodic downlink small data is transferred to the terminal in the inactive state, sending the second downlink control signaling scrambled by the configured scheduling wireless network temporary identifier to the terminal so as to be used for deactivating the pre-configured resource for the inactive state downlink small data transmission based on pre-configured authorization semi-persistent scheduling, which is issued by the terminal.

28. A downlink data transmission method, wherein the method is performed by a terminal, the method comprising:

receiving a radio resource control release message sent by a network device, wherein the radio resource control release message comprises inactive state downlink small data transmission configuration information, the inactive state downlink small data transmission configuration information is used for configuring pre-configured resources for receiving downlink small data sent by the network device when the terminal is in an inactive state, the inactive state downlink small data transmission configuration information comprises pre-configured authorized semi-persistent scheduling configuration information, and the pre-configured authorized semi-persistent scheduling configuration information is used for configuring semi-persistent scheduling resources for inactive state downlink small data transmission;

receiving a first downlink control signaling sent by the network equipment;

Responding to the first downlink control signaling to enter an inactive state, and activating the pre-configured resource which is transmitted by the terminal in the inactive state and used for receiving the downlink small data in the inactive state;

receiving the downlink small data sent by the network equipment on the preconfigured resource;

after receiving the downlink small data, receiving a second downlink control signaling sent by the network equipment;

and responding to the second downlink control signaling to deactivate the pre-configured resource for non-activated downlink small data transmission based on semi-persistent scheduling issued by the terminal.

29. A network device, comprising:

a sending unit, configured to send a radio resource control release message to a terminal, where the radio resource control release message includes inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information is used to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information includes preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information is used to configure semi-persistent scheduling resources for transmitting the inactive downlink small data;

The sending unit is further configured to send a first downlink control signaling to the terminal when the network device has downlink small data to be transmitted to the terminal in an inactive state, where the first downlink control signaling is used to activate the preconfigured resource for receiving the downlink small data in the inactive state, which is issued by the terminal in the inactive state;

the sending unit is further configured to send the downlink small data to the terminal in the inactive state on the preconfigured resource;

the sending unit is further configured to send a second downlink control signaling to the terminal after the downlink small data is transferred to the terminal in the inactive state, where the second downlink control signaling is used to deactivate the pre-configured resource for inactive state downlink small data transmission based on semi-persistent scheduling, which is issued for the terminal.

30. A terminal, comprising:

a receiving unit, configured to receive a radio resource control release message sent by a network device, where the radio resource control release message includes inactive downlink small data transmission configuration information, where the inactive downlink small data transmission configuration information is configured to configure a preconfigured resource for receiving downlink small data sent by the network device when the terminal is in an inactive state, and the inactive downlink small data transmission configuration information includes preconfigured authorized semi-persistent scheduling configuration information, where the preconfigured authorized semi-persistent scheduling configuration information is configured to configure semi-persistent scheduling resources for transmitting inactive downlink small data;

The receiving unit is further configured to receive a first downlink control signaling sent by the network device;

the processing unit is used for responding to the first downlink control signaling, entering a non-activated state and activating the pre-configured resource which is transmitted by the terminal in the non-activated state and used for receiving the non-activated downlink small data;

the receiving unit is further configured to receive, on the preconfigured resource, the downlink small data sent by the network device;

the receiving unit is further configured to receive a second downlink control signaling sent by the network device after receiving the downlink small data;

and the processing unit is further configured to deactivate the pre-configured resource for inactive downlink small data transmission based on semi-persistent scheduling issued by the terminal in response to the second downlink control signaling.

31. A communication device, comprising:

at least one processor;

a communication interface for information interaction by the communication device with other communication devices, which when executed in the at least one processor implements the method of any of claims 1 to 27; or,

The method of claim 28.

32. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a communication device implements the method of any one of claims 1 to 27; or,

the method of claim 28.