CN111800856A

CN111800856A - Data transmission method, paging method, terminal, base station and core network equipment

Info

Publication number: CN111800856A
Application number: CN201910606105.4A
Authority: CN
Inventors: 鲍炜; 吴昱民
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-10-20
Anticipated expiration: 2039-07-05
Also published as: CN111800856B

Abstract

The invention provides a data transmission method, a paging method, a terminal, a base station and core network equipment, wherein the method comprises the following steps: receiving a paging message of the terminal, and initiating a random access process according to the paging message; receiving downlink data of the terminal sent by a service base station of the terminal in the random access process; in the embodiment of the invention, the terminal receives the downlink data of the terminal sent by the service base station in the random access process, so that the efficiency of sending the downlink small data to the terminal can be improved, signaling overhead such as state conversion, reconfiguration and the like is avoided, and time delay is reduced.

Description

Data transmission method, paging method, terminal, base station and core network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a paging method, a terminal, a base station, and a core network device.

Background

In the later stage of LTE (Long Term Evolution) research, a fast transmission method for small data is introduced, and the method is mainly applied to terminals such as MTC (Machine Type Communication) and NB-IOT (narrow band Internet of Things). The typical scenario is automatic reporting of the water meter, and the data transmission characteristic is that a data packet is transmitted in about 12 hours and the size is about one hundred to several hundred bytes. In order to enable such sparse small Data to be efficiently transmitted and avoid RRC (Radio Resource Control) state transition and RRC signaling overhead caused thereby, the LTE introduces an EDT (Early Data Transmission) technique. The technology is mainly applied to uplink, so that the terminal can complete data transmission in an Idle state and an Inactive state without RRC state transition.

The existing EDT process is only applicable to a small data transmission process triggered by uplink data, that is, uplink small data must be sent first, and optionally, as a response, a downlink small data can be sent incidentally, but triggering of direct downlink data sending is not supported. In the NR (New Radio, New air interface) stage, the application scenario of efficient transmission of small data will be wider, except in the IOT field, various wearable devices are present, and besides uplink small data, efficient transmission of downlink small data also has strong requirements. At present, a mature solution for how NR performs efficient transmission of small downlink data is lacking.

Disclosure of Invention

The embodiment of the invention provides a data transmission method, a paging method, a terminal, a base station and core network equipment, which aim to solve the problem that the high-efficiency transmission of downlink small data cannot be directly carried out in the related technology.

In order to solve the technical problem, the invention is realized as follows: a data transmission method is applied to a terminal and comprises the following steps:

receiving a paging message of the terminal, and initiating a random access process according to the paging message;

and receiving downlink data of the terminal sent by a service base station of the terminal in the random access process.

The embodiment of the invention also provides a data transmission method, wherein the service base station of the application terminal comprises the following steps:

sending a paging message to a terminal;

and in the random access process initiated by the terminal according to the paging message, sending downlink data of the terminal to the terminal.

The embodiment of the invention provides a paging method, which is applied to core network equipment and comprises the following steps:

sending a paging message to a base station in the tracking area range of the terminal under the condition that downlink data of the terminal is reached;

or,

and sending the downlink data of the terminal to an anchor point base station of the terminal under the condition that the downlink data of the terminal is reached.

An embodiment of the present invention provides a terminal, including:

the access module is used for receiving the paging message of the terminal and initiating a random access process according to the paging message;

a receiving module, configured to receive, in the random access process, downlink data of the terminal sent by a serving base station of the terminal.

The embodiment of the invention provides a base station, which is a service base station of a terminal and comprises the following components:

the paging sending module is used for sending a paging message to the terminal;

and the data sending module is used for sending the downlink data of the terminal to the terminal in the random access process initiated by the terminal according to the paging message.

An embodiment of the present invention provides a core network device, including:

a sending module, configured to send a paging message to a base station within a tracking area of a terminal when downlink data of the terminal arrives;

or, the method is used for sending the downlink data of the terminal to the anchor base station of the terminal when the downlink data of the terminal is reached.

An embodiment of the present invention provides an apparatus, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the data transmission method as described above; alternatively, the computer program realizes the steps of the paging method as described above when executed by the processor.

An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the data transmission method as described above; alternatively, the computer program realizes the steps of the paging method as described above when executed by a processor.

In the embodiment of the invention, the terminal receives the downlink data of the terminal sent by the service base station in the random access process, so that the efficiency of sending the downlink small data to the terminal can be improved, signaling overhead such as state conversion, reconfiguration and the like is avoided, and time delay is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a flowchart illustrating steps of a data transmission method according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating an interaction of four-step random access in a data transmission method according to an embodiment of the present invention;

fig. 3 is an interaction diagram of two-step random access in the data transmission method according to the embodiment of the present invention;

fig. 4 is a flowchart illustrating a second step of the data transmission method according to the embodiment of the invention;

fig. 5 is a schematic interaction diagram of a serving base station and a core network device in a data transmission method according to an embodiment of the present invention;

fig. 6 is a schematic interaction diagram illustrating a serving base station, an anchor base station, and a core network device in a data transmission method according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating steps of a paging method according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a core network device according to an embodiment of the present invention;

fig. 11 is a second schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The data transmission method, the paging method, the terminal, the base station and the core network equipment provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a 5G system, an Evolved Long Term Evolution (lte) system, or a subsequent lte communication system. It should be noted that the above-mentioned communication system may include a plurality of terminals, and the base station may communicate (transmit signaling or transmit data) with a plurality of terminals.

The base station provided in the embodiment of the present invention may be a base station, which may be a commonly used base station, an evolved node base (eNB), or a base station in a 5G system (for example, a next generation base station (gNB) or a Transmission and Reception Point (TRP)) or a cell, and other devices.

The terminal provided by the embodiment of the invention can be a Mobile phone, a tablet Computer, a notebook Computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, a Wearable Device, a vehicle-mounted Device or a Personal Digital Assistant (PDA), and the like. It should be noted that the specific type of the terminal is not limited in the embodiment of the present invention. In the embodiment of the present invention, LTE and NR systems are taken as examples, but the present invention is not limited to this system, and the technical solution provided by the present invention may be applied to other systems having the same problem.

As shown in fig. 1, an embodiment of the present invention provides a data transmission method, which is applied to a terminal, and includes:

step 101, receiving a paging message of the terminal, and initiating a random access process according to the paging message;

step 102, in the random access process, receiving downlink data of the terminal sent by a serving base station of the terminal.

In the embodiment of the invention, the paging message of the terminal specifically refers to the paging message consistent with the identifier of the terminal, and after the terminal receives the paging message consistent with the identifier of the terminal, the terminal initiates a random access process. It should be noted that, in the embodiment of the present invention, the purpose of the terminal initiating the random access procedure is to acquire synchronization with a network side device (i.e., a serving base station) and receive downlink data.

Optionally, the downlink data of the terminal mentioned in the embodiment of the present invention generally refers to small data, for example, data with a data packet size smaller than a certain threshold; and for example, data whose QoS transmission characteristics of a data packet satisfy a certain condition.

The random process in the embodiment of the invention comprises the following steps: four-step random access and two-step random access.

Accordingly, step 102 includes:

receiving downlink data of the terminal through a message 4 of four-step random access;

or receiving downlink data of the terminal through the message B of the two-step random access.

It should be noted that, in the two-step random access process, because the MsgA part is successful or the base station algorithm determines that there is a possibility that the MsgA is not received as expected after the terminal sends MsgA, but the Msg2 of the four-step random access process is received, at this time, the terminal sends Msg3 according to the indication of Msg2, the Msg3 content is the Preamble-removed PUSCH data part of MsgA, and then the subsequent Msg4 may still carry the downlink data of the terminal. The process is a two-step random access process and a four-step random access process and carries downlink EDT.

As shown in fig. 2, the flow of the four-step random access is as follows:

after receiving the paging message identified by the terminal, the terminal selects the nearest random access resource to send a message 1(Msg1, namely random access preamble), and after receiving the Msg1, the serving base station replies a message 2(Msg2), namely a random access response rar (rach response), wherein the message carries UL Grant (uplink resource Grant) for the terminal to use when the terminal sends the Msg 3; the system also comprises TA (Time Advance), RAPID (Random Access preamble ID Random access preamble identifier), T-C-RNTI (Temporary cell radio network Temporary identifier) and other information. The terminal immediately uses the uplink resource corresponding to the UL Grant in the RAR to send a message 3(Msg3), the Msg3 mainly aims to indicate the terminal identity, and then the network side sends the message 4(Msg4) with the downlink data of the terminal piggybacked after confirming that the terminal identity is correct. At this point, when a typical downlink EDT process is finished, the terminal still remains in the original idle state or inactive state, and successfully receives downlink data once.

The two-step random access procedure is a further improvement of the four-step random access procedure, as shown in fig. 3, the Msg1 content and the Msg3 content in the four-step random access procedure are merged into a message a (msga) to be sent by the terminal to the serving base station, and the Msg2 content and the Msg4 content are merged into a message b (msgb) to be sent by the serving base station to the terminal.

The RRC signaling content in MsgA is consistent with that of Msg3 in four-step random access. The MsgB contains a contention resolution ID, TA, C-RNTI, RRC signaling and data parts, wherein the content of the RRC signaling and data parts is consistent with the content of the Msg4 in the four-step random access.

Optionally, before receiving the downlink data of the terminal sent by the serving base station of the terminal, the method further includes:

in the random access process, sending the identity information of the terminal to a service base station of the terminal;

accordingly, step 102 includes:

and in the random access process, receiving downlink data of the terminal, which is sent by a service base station of the terminal according to the identity information of the terminal.

In the embodiment of the invention, the serving base station sends the downlink small data after confirming the terminal identity, thereby avoiding resource waste caused by multi-cell broadcasting of the small data and well improving the system efficiency.

In short, the terminal receives the paging message, initiates a random access process, and sends the identity information of the terminal to the serving base station in the random access process (optionally, the idle terminal requests to carry the identity information of the terminal through an RRC connection establishment request or a data transmission request, and the non-connected terminal requests to carry the identity information of the terminal through an RRC connection recovery), and after confirming the identity of the terminal, the serving base station sends the downlink data of the terminal to the terminal, and the data transmission process does not accompany RRC state transition of the terminal.

Optionally, in the embodiment of the present invention, the paging message carries a downlink early data transmission indication.

Specifically, the downlink early data transmission indication is used to indicate that the terminal needs to use the duration of a contention resolution timer applicable to EDT in a subsequent random access process, and/or indicate that the terminal needs to prepare for receiving data.

As an alternative embodiment, step 102 comprises:

receiving a downlink Radio Resource Control (RRC) message sent by the serving base station in the random access process;

wherein the downlink RRC message carries downlink data of the terminal, or the downlink data of the terminal is multiplexed with the downlink RRC message.

Wherein the downlink RRC message comprises: an early data transfer complete message or an RRC connection release message.

For an Idle state (Idle state) terminal, the Idle state terminal may notify the serving base station of the Identity information of the terminal through an uplink RRC message (e.g., an RRC connection establishment request message or an early data transmission request message), for example, the Identity information of the terminal is S-TMSI (SAE-temporal Mobile Subscriber Identity, Temporary Mobile terminal Identity in evolved system architecture). After determining the terminal identity, the serving base station sends the downlink data of the terminal by carrying the downlink RRC message. The downlink RRC message may be a message type such as an enhanced data transmission complete message that may piggyback non-access layer data. The uplink RRC message is sent through a four-step random access message 3, and the downlink RRC message carrying downlink data at a network side can be sent through a message 4; or, the uplink RRC message is sent through the message a of the two-step random access, and the downlink RRC message carrying the downlink data at the network side can be sent through the message B; or, the uplink RRC message is sent through the message a of the two-step random access, and the downlink RRC message carrying the downlink data at the network side can be sent through the message 4 (two-step random access fallback to four-step random access).

Aiming at an Inactive state (Inactive state) terminal, the Inactive state terminal sends an RRC connection recovery request message in Msg3 or MsgA, wherein identity information of the terminal is carried, such as I-RNTI, after the identity of the terminal is confirmed to be correct, a network side sends an RRC connection release message to the terminal and simultaneously carries downlink data, and the downlink data is sent in a DRB form on a DTCH (traffic dedicated channel) and is multiplexed with the RRC message.

Optionally, in the above embodiment of the present invention, when the terminal is in an inactive state, the downlink data of the terminal is transmitted in a form of a data radio bearer DRB.

For the terminal in the non-activated state, if the message 4 or the message B contains a downlink RRC message, the downlink data is transmitted in a DRB form in a multiplexing way with the downlink RRC message; if the message 4 or the message B does not contain the downlink RRC message, the downlink data is directly transmitted in the message 4 or the message B through the DRB; for example, for an inactive terminal with DRB configuration, the serving base station may directly transmit data using DRB (generally applicable to the case of subsequent downlink data transmission or subsequent uplink data transmission), and then release RRC connection using RRC message.

It should be noted that, for the Msg4 transmission, since the PDCCH (physical downlink control channel) scrambled by using the C-RNTI (cell radio network temporary identifier) dedicated to the terminal is used for scheduling, similar to normal data transmission, HARQ (Hybrid Automatic Repeat reQuest) feedback and retransmission processes may be available, when the reception is unsuccessful, the terminal feeds back NACK, and the network side retransmits the Msg4 again until the ACK fed back by the terminal is successfully received, which indicates that the early downlink data transmission is normally ended. Or still unsuccessful after a certain number of retransmissions, without excluding the state transition, the terminal enters the RRC connected state first, and then transmits the data through the DRB and the dedicated configuration.

Optionally, in the existing four-step random access process, after the Msg3 is sent or retransmitted, the terminal starts/restarts the contention resolution timer to determine correct reception of the Msg4, and after the contention resolution timer times out, the correct Msg4 is still not received, and the four-step random access process is considered to fail, and the random access process is restarted. In the embodiment of the present invention, Msg4 is required to carry downlink data of the terminal, and a service base station of the terminal may need a long time to acquire the downlink data (an idle state requires a User Plane Function (UPF) entity to acquire data, and an Inactive state requires an anchor base station at which the terminal enters an Inactive state to acquire downlink data), so that the downlink EDT needs to use a long contention resolution timer length. The terminal may determine whether to use the EDT dedicated contention resolution timer length or the normal contention resolution timer length by the following manner, that is, in a case that the random access procedure is a four-step random access, the method further includes:

determining the length of a contention resolution timer dedicated for downlink early data transmission in the random access process under the condition that the received paging message carries a downlink early data transmission indication; when the paging message received by the terminal has a downlink EDT related downlink early data transmission indication, the terminal is informed that the downlink EDT process is the downlink EDT process, the terminal uses the length of a contention resolution timer special for the EDT in the following four-step random access process, otherwise, the paging message does not carry the downlink early data transmission indication, and the length of a common contention resolution timer is used;

or,

determining a length of a contention resolution timer dedicated for downlink early data transmission in the random access process when a paging message of the terminal is received and a system message indicating the start of a downlink early data transmission function is received; the SIB (system information block) is provided with a switch with a downlink EDT function, the switch is controlled by a network side, when the downlink EDT is started, the default behavior of the terminal is to receive a paging message of the terminal, the length of a contention resolution timer special for the EDT is used in the following four-step random access process, otherwise, when the downlink EDT in the SIB is closed, the length of a common contention resolution timer is used;

or,

determining the length of a contention resolution timer dedicated for downlink early data transmission in the random access process under the condition of receiving a paging message of the terminal; according to the terminal version or capability information, R17 and the following terminals, or the terminals supporting the downlink EDT, the default action is to receive the paging message of the terminal, and the length of a contention resolution timer special for the EDT is used in the following four-step random access process, otherwise, the length of a common contention resolution timer is used by other terminals.

For a terminal in the inactive state, its DRB is originally in the suspended state, and since data is sent through the DRB, the terminal needs to ensure that the relevant configuration of the DRB has been restored before Msg4 or MsgB is received. The triggering method for the terminal to recover the DRB configuration comprises the following steps:

under the condition that the received paging message carries a downlink early data transmission indication, the terminal recovers the configuration of the DRB; when a paging message received by the terminal has a downlink early data transmission indication related to downlink EDT, and the terminal knows that the downlink EDT process is a downlink EDT process, the terminal restores DRB configuration before Msg4 or MsgB and completes updating of a next-hop key according to security information carried when entering an inactive state (because DL EDT data in Msg4 is encrypted and/or integrity protected by using a new key);

or,

under the condition that the paging message of the terminal is received and the system message indicating the start of the downlink early data transmission function is received, the terminal recovers the configuration of the DRB; the SIB (system information block) is provided with a switch with a downlink EDT function and is controlled by a network side, when the downlink EDT is started, the default behavior of the terminal is to receive the paging message of the terminal, namely to recover the DRB configuration and complete the key update;

or,

when the paging message of the terminal is received and the version or capability information of the terminal meets the preset conditions, the terminal recovers the configuration of the DRB; according to the terminal version or capability information, R17 and the following terminals, or the terminals supporting the downlink EDT, the default action is to receive the paging message of the terminal, namely to recover the DRB configuration and complete the key update.

Optionally, when the configuration of the DRB is restored, the method further includes: restoring the configuration of the Signaling Radio Bearer (SRB), and restoring the default configuration of the Medium Access Control (MAC) layer and the following layers.

It should be noted that there is a difference between the two-step random access and the four-step random access, that is, the MsgB is scheduled by using RA-RNTI instead of C-RNTI, so that the confirmation and retransmission of the MsgB are not as convenient as the Msg4 of the four-step random access, and therefore, in case that the random access process is the two-step random access, the message B also carries an uplink grant resource or an uplink feedback position; the method further comprises the following steps:

under the condition that the competition resolving is successful, the terminal sends feedback information to the base station on the uplink authorization resource or the uplink feedback position carried by the message B; the feedback information is used for indicating the terminal to successfully receive the message B.

The uplink grant resource generally refers to a resource of a PUSCH (physical uplink shared channel) for transmitting high-level data. The uplink feedback position may include feedback of uplink PUSCH data transmission, or may be feedback of a physical layer, such as HARQ feedback, and the uplink feedback position is another configuration format and may only require 1bit of information.

Further, two-step random access corresponds to combining two timers for receiving Msg2 and Msg4 in four-step random access. However, because the Msg 2-related RAR timer (10ms) is related to the calculation of the RA-RNTI, the MsgB timer after combination will have a large extension (for example, several thousand milliseconds) in the case of downlink EDT, causing that the calculation method using the original RA-RNTI cannot well distinguish which position the Preamble is used by the terminal at all, because the original RA-RNTI calculation method can only distinguish different Preamble positions within 10ms, and the MsgB window extends to several times of 10ms, which includes several 10ms inside, the terminal cannot well judge whether the MsgB is directed to itself. The embodiment of the invention provides two solving methods:

a first mode, where the receiving downlink data of the terminal sent by a serving base station of the terminal in a case that the random access process is two-step random access, includes:

determining a radio network temporary identifier RA-RNTI (random access radio network temporary identifier) for scheduling of a message B according to the time-frequency position of the random access preamble sent by the terminal;

receiving the message B scheduled by using the RA-RNTI, wherein the message B carries a cell radio network temporary identifier C-RNTI of the terminal;

and receiving downlink data of the terminal, which is sent by the serving base station through a downlink control channel scrambled by the C-RNTI of the terminal.

Reserving the existing calculation mode of RA-RNTI, firstly replying MsgB by the service base station in the RAR window range, wherein the MsgB comprises the C-RNTI of the terminal, firstly ensuring that the random access process is successful, obtaining a legal C-RNTI by the terminal, then using the PDCCH scrambled by the C-RNTI to schedule the downlink of the terminal by the subsequent service base station, and sending RRC signaling, downlink data and other possible uplink and downlink data.

A second mode, where in a case that the random access process is a two-step random access, the receiving downlink data of the terminal through the message B of the two-step random access includes:

receiving the message B scheduled by using the RA-RNTI, wherein the message B carries the radio frame number and the downlink data of the random access lead code sent by the terminal;

and determining whether the message B is the message B sent to the terminal according to the radio frame number of the random access preamble sent by the terminal and the RA-RNTI.

The usage of RA-RNTI is enhanced, radio frame number information for sending Preamble is carried in MsgB, which is equivalent to the radio frame number explicit carrying, the position in the radio frame is distinguished by RA-RNTI, namely, the terminal needs the radio frame number and RA-RNTI carried by the message B to confirm whether the message B is for the terminal, if one message does not conform, the terminal can give up the message, and only if the two messages conform, the terminal can receive and compare other fields; this approach requires the terminal to know explicitly that this is a downlink EDT related procedure before the new usage is used.

Due to the sending of the downlink EDT, it is likely that an uplink data transmission process is triggered immediately, such as feedback of an uplink service layer (for example, the downlink data requires the terminal to perform feedback and report, and the terminal needs the service layer to report information immediately), ACK of a TCP layer, ACK of an RLC layer, and the like. As another optional embodiment, after receiving the downlink data of the terminal sent by the serving base station of the terminal, the method further includes:

and under the condition that uplink data are waiting to be transmitted, the terminal initiates an uplink early data transmission process and uses at least one DRB or at least one RRC message to transmit the uplink data.

That is, the terminal immediately initiates an uplink EDT procedure to perform the transmission of the uplink data. The uplink EDT is the existing process, but there is a limitation that only one data can be transmitted currently, and the embodiment of the present invention expands the limitation, and at least for an inactive state terminal, since it uses DRBs for data transmission, and the number of MAC multiplexing DRBs is not limited, a plurality of data packets such as service layer feedback, TCP feedback, and RLC layer feedback can be transmitted at one time. For an idle terminal, to transmit a plurality of uplink EDT Data, an RRC Early Data transmission Request message (RRC Early Data Request) needs to be extended, and a non-access layer Data field is made in a list form, so that multiple Data fields are allowed to be carried, and the plurality of Data fields can be guaranteed to be received simultaneously and sequentially; or when a plurality of uplink Data packets are sent, a plurality of RRC Early Data Request messages are sent, and each message carries one piece of Data; this approach also requires consideration of the ordering problem and adding an end marker to the last data. Alternatively, it may be specified that uplink EDT transmission is allowed only if a plurality of messages including the last message can be simultaneously accommodated, otherwise, the normal flow is followed to enter the connected state to transmit data.

Although the existing process can be multiplexed, since the uplink EDT and the downlink EDT are relatively independent, it is likely that a data path between the idle terminal and the core network is already removed after the downlink EDT, which causes the subsequent uplink EDT to need to reestablish a data path between the base station and the core network, and increases the time delay. To avoid this drawback, the base station may still maintain the path of the terminal for a while after the downlink EDT, and tear down the link to the core network after confirming that there is no uplink feedback data; that is, the transmission pipeline between the base station and the core network for the terminal is reserved for a preset time period.

As another optional embodiment, the message 4 of the four-step random access or the message B of the two-step random access carries the uplink Grant resource (indicated by the UL Grant for transmission of possible uplink feedback) allocated to the terminal; it should be noted that, because the uplink data transmitted by the uplink grant resource needs to be processed first on the downlink data and then uplink feedback data is generated, and the preparation process is longer than the time required by the general uplink data, the effective time of the UL grant carried in the Msg4 needs to be specified or configured separately from the general uplink scheduling, which may be specified in the standard, configured in the SIB, or carried with the UL grant in the Msg 4.

Or, the base station distributes uplink authorization resources for the terminal through a downlink control channel; the ULGrant carried in Msg4 may be in the form of a MAC CE. Certainly, after the Msg4 succeeds, uplink resources are allocated to the terminal in a C-RNTI scrambling PDCCH uplink scheduling mode.

The method further comprises the following steps:

and the terminal transmits uplink data to the base station by using the allocated uplink authorization resource.

In order to enable the terminal to continuously monitor the PDCCH after the success of the Msg4, the subsequent C-RNTI scrambled PDCCH scheduling still existing in the terminal needs to be displayed in the Msg4, and the possibility that the terminal continuously receives and transmits data is kept, namely if the base station allocates uplink authorized resources for the terminal through a downlink control channel, the message 4 of the four-step random access or the message B of the two-step random access also carries indication information, and the indication information is used for indicating the terminal to continuously monitor the downlink control channel subsequently;

wherein the indication information is indicated by RRC signaling of message 4 or message B; an RRC signaling indication in the Msg4 or the MsgB, a new field (Not last or Still connection, etc.) is added in the existing RRC signaling which may be in the Msg4 under the condition, and the terminal is indicated to continuously monitor the PDCCH subsequently;

or, the indication information is indicated by the MAC information of message 4 or message B; for example, with a special MAC CE, or MAC header field extension, the terminal is instructed to continuously monitor the PDCCH subsequently;

or, the indication information is indicated through a new RRC signaling in the message 4 or the message B; for example, the Msg4 only includes DRB data and MAC contention resolution information (RRC connection release signaling is not sent to the inactive terminal until all uplink and downlink are sent completely), or the Msg4 only includes RRC signaling for carrying idle terminal data, a new design format (RRC early data continue is sent for the idle terminal, and the like, and RRC early data transmission is completed until all uplink and downlink data are sent completely).

By using the above mode, the terminal can send a plurality of uplink and downlink EDT data without performing state transition or special configuration until all the uplink and downlink data are sent, and then the ending process is completed by RRC connection release or RRC early data transmission.

For uplink, if the serving base station allocates uplink resources to the terminal, no matter through Msg4 or PDCCH, and the terminal does not have any uplink data transmission or the uplink data of the terminal has been transmitted, the terminal transmits an empty BSR to the base station or uses only part of the resources with UL Grant to indicate that the EDT procedure can be ended without data in the following. Namely, the method further comprises:

after the terminal completes the transmission of the uplink data, sending a buffer status report with a buffer status of zero to the base station, wherein the buffer status report with the buffer status of zero is used for indicating that no uplink data is transmitted subsequently;

or,

and after the terminal completes the transmission of the uplink data, indicating that no uplink data is transmitted subsequently by using the allocated part of the uplink authorized resources.

In summary, in the embodiment of the present invention, in the random access process, the terminal receives the downlink data of the terminal sent by the serving base station, which can improve the efficiency of sending the downlink small data to the terminal, avoid signaling overhead such as state transition and reconfiguration, and reduce the time delay.

As shown in fig. 4, an embodiment of the present invention further provides a data transmission method, where a serving base station of an application terminal includes:

step 401, sending a paging message to a terminal;

step 402, in the random access process initiated by the terminal according to the paging message, sending the downlink data of the terminal to the terminal.

Accordingly, step 402 includes:

sending downlink data of the terminal through a message 4 of four-step random access;

and sending the downlink data of the terminal through the message B of the two-step random access.

As shown in fig. 2, the flow of the four-step random access is as follows:

after receiving the paging message identified by the terminal, the terminal selects the nearest random access resource to send a message 1(Msg1, namely random access preamble), and after receiving the Msg1, the serving base station replies a message 2(Msg2), namely a random access response rar (rach response), wherein the message carries UL Grant (uplink resource Grant) for the terminal to use when the terminal sends the Msg 3; and further includes information such as TA (Time Advance), RAPID, T-C-RNTI (TemporaryC-RNTI, temporary cell radio network temporary identifier), and the like. The terminal immediately uses the uplink resource corresponding to the UL Grant in the RAR to send a message 3(Msg3), the Msg3 mainly aims to indicate the terminal identity, and then the network side sends the message 4(Msg4) with the downlink data of the terminal piggybacked after confirming that the terminal identity is correct. At this point, when a typical downlink EDT process is finished, the terminal still remains in the original idle state or inactive state, and successfully receives downlink data once.

Optionally, before sending the downlink data of the terminal to the terminal, the method further includes:

receiving the identity information of the terminal sent by the terminal in the random access process initiated by the terminal according to the paging message;

the corresponding step 402 includes:

and in the random access process initiated by the terminal according to the paging message, sending downlink data of the terminal to the terminal according to the identity information of the terminal.

As an alternative embodiment, step 402 includes:

in the random access process initiated by the terminal according to the paging message, sending a downlink RRC message to the terminal;

Wherein the downlink RRC message comprises:

an early data transfer complete message or an RRC connection release message.

Aiming at an Inactive state (Inactive state) terminal, the Inactive state terminal sends an RRC connection recovery request message in Msg3 or MsgA, wherein identity information of the terminal is carried, such as I-RNTI (Inactive Radio Network temporary identifier), after the identity of the terminal is confirmed to be correct, a Network side sends an RRC connection release message to the terminal and carries downlink data at the same time, and the downlink data is sent in a DRB form on a DTCH (traffic dedicated channel) and is multiplexed with the RRC message.

and receiving feedback information sent by the terminal on an uplink authorized resource or an uplink feedback position carried by the message B, wherein the feedback information is used for indicating the terminal to successfully receive the message B.

Further, two-step random access corresponds to combining two timers for receiving Msg2 and Msg4 in four-step random access. However, since the Msg 2-related RAR timer (10ms) is related to the calculation of RA-RNTI, the MsgB timer after merging will have a large extension (e.g. several thousand milliseconds) in the case of downlink EDT, causing the calculation of the original RA-RNTI to be severely affected. The embodiment of the invention provides two solving methods:

the first mode is as follows: in the case that the random access process is two-step random access, the sending downlink data of the terminal to the terminal includes:

sending the message B, wherein the message B carries a cell radio network temporary identifier C-RNTI of the terminal;

and sending the downlink data of the terminal by using a downlink control channel scrambled by the C-RNTI of the terminal.

In the second mode, the message B of the two-step random access also carries the radio frame number for sending the random access preamble. The usage of RA-RNTI is enhanced, radio frame number information for sending Preamble is carried in MsgB, which is equivalent to the radio frame number explicit carrying, the position in the radio frame is distinguished by RA-RNTI, namely, the terminal needs the radio frame number and RA-RNTI carried by the message B to confirm whether the message B is for the terminal, if one message does not conform, the terminal can give up the message, and only if the two messages conform, the terminal can receive and compare other fields; this approach requires the terminal to know explicitly that this is a downlink EDT related procedure before the new usage is used.

Due to the sending of the downlink EDT, it is likely that an uplink data transmission process is triggered immediately, such as feedback of an uplink service layer (for example, the downlink data requires the terminal to perform feedback and report, and the terminal needs the service layer to report information immediately), ACK of a TCP layer, ACK of an RLC layer, and the like. As yet another alternative embodiment, the method further comprises:

and under the condition that the terminal has uplink data to be transmitted, receiving the uplink data transmitted by the terminal by using at least one DRB or at least one RRC message in the initiated uplink early data transmission process.

The method further comprises the following steps:

and receiving the uplink data sent by the terminal on the allocated uplink authorized resource.

receiving a buffer status report with a buffer status of zero sent by a terminal, wherein the buffer status report with the buffer status of zero is used for indicating that no uplink data transmission exists subsequently;

or,

and after the terminal uses the allocated part of the uplink authorized resources to transmit the uplink data, confirming that no uplink data is transmitted subsequently.

Further, the embodiment of the present invention also describes how the serving base station obtains the downlink data of the terminal: for an idle terminal, before sending downlink data of the terminal to the terminal, the method further includes:

receiving identity information of a terminal, which is sent by the terminal;

determining the terminal as a terminal carrying a downlink early data transmission indication in a paging message sent by core network equipment or determining the terminal as a preset type terminal according to the identity information of the terminal;

requesting downlink data of the terminal from core network equipment through an interface between the core network equipment and a base station;

and receiving downlink data of the terminal sent by the core network equipment.

For an idle terminal, after obtaining the identity information of the terminal, such as S-TMSI, the base station may request the data of the terminal from the core network if it is found that the terminal carries an indication of downlink early data transmission in a paging message of the core network, or if it is a specific type of terminal, such as IoT terminal, which is suitable for downlink early data transmission, for example, the base station may request the downlink data of the terminal through an interface between the gNB and the AMF (Access and Mobility Management Function), which is also a control plane signaling procedure between the base station and the core network, and the procedure carries the data of the terminal from the AMF signaling to the serving base station. The serving base station may then transmit over the air.

Optionally, an interface between the core network device and the base station is an N2 interface, and the method further includes:

and receiving the N2 connection release signaling sent by the core network equipment.

A typical process is shown in fig. 5:

the service base station obtains the terminal identity, carries out N2 interface signaling to the AMF, the AMF obtains the downlink data of the terminal through SMF interaction, then the AMF transmits the downlink data of the terminal to the service base station through a control plane process in a downlink non-access stratum signaling transmission mode, and then the service base station transmits the downlink data to the terminal. After the data transmission, the core network and the serving base station release the associated N2 connection, which corresponds to the terminal returning to the idle state in the core network.

For an inactive state terminal, before sending downlink data of the terminal to the terminal, the method further includes:

receiving identity information of a terminal, which is sent by the terminal;

determining an anchor base station of the terminal according to the identity information of the terminal;

requesting context information of the terminal from the anchor base station;

and receiving the context information of the terminal and the downlink data of the terminal, which are fed back after the security verification of the anchor point base station on the terminal.

Further, the method further comprises:

initiating a terminal path switching request to core network equipment, wherein the path switching request is used for requesting to update the service base station to be a new anchor base station of the terminal;

receiving a path switching request confirmation sent by the core network equipment;

and sending a context release signaling to an original anchor point base station of the terminal, wherein the context release signaling is used for indicating the original anchor point base station to delete the context information of the terminal.

For an Inactive state terminal, after receiving a paging message, the terminal performs a random access procedure, and a current serving base station may not be an anchor base station storing a context of the terminal, so that the current serving base station needs to request terminal data from the anchor base station, and a typical procedure is shown in fig. 6:

the serving base station can find an anchor base station of the terminal according to the identity information of the terminal, such as I-RNTI, and initiate a request for the context information of the terminal; if the anchor point base station verifies that the terminal passes the safety, the anchor point base station sends the context information of the terminal, mainly configuration information and safety related information, to the service base station; and sending the downlink data of the terminal to the service base station; then the service base station sends the data to the terminal at an air interface; the service base station initiates a path switching request of the terminal to the AMF, and informs the AMF that the terminal is under the service base station at present, and the service base station is used as a new anchor base station of the terminal; and after the anchor point base station is updated successfully, the service base station informs the original anchor point base station that the context information of the terminal can be deleted.

As yet another alternative, step 401 comprises:

receiving a paging message sent by core network equipment or an anchor point base station of the terminal;

and sending the paging message to a terminal on an air interface according to the paging message.

If the terminal is in an idle state, the paging message is sent to the serving base station by the core network equipment, and if the terminal is in an inactive state, the paging message is sent to the serving base station by the anchor base station.

And the service base station receives the paging of the terminal sent by the core network, and performs the paging of the terminal on an air interface according to the paging time of the terminal obtained by calculation. Optionally, when the paging message sent by the AMF carries the downlink early data transmission indication, the serving base station may also determine whether the paging message of the air interface carries the downlink early data transmission indication according to its own algorithm and its own conditions (e.g., whether downlink EDT capability is supported, random access load/success rate, etc.). The base station has the following two methods to carry the downlink early data transmission indication:

the paging code word of the terminal in the paging message carries the downlink early data transmission indication; adding DL EDT Indication information in a paging code word corresponding to the terminal of the paging message, if the terminal is a TR terminal or if the terminal appears, indicating that downlink EDT sending is to be carried out, otherwise, a normal downlink data arrival process is carried out;

or, the target domain in the paging message is used for carrying the downlink early data transmission indication; carried in the paging short message, if the 8-bit information of the current paging short message only uses 2 bits of the 8-bit information, we can define the 3 rd bit as DL EDT indication, and if the field is set to 1, it indicates that all terminals in the paging message simultaneously sent with the paging short message are going to perform downlink EDT sending.

In summary, in the embodiment of the present invention, the serving base station sends the downlink data of the terminal in the random access process, which can improve the efficiency of sending the downlink small data to the terminal, avoid signaling overhead such as state transition and reconfiguration, and reduce the time delay.

As shown in fig. 7, an embodiment of the present invention further provides a paging method, applied to a core network device, including:

step 701, sending a paging message to a base station in a tracking area range of a terminal under the condition that downlink data of the terminal is reached; or, when the downlink data of the terminal is reached, the downlink data of the terminal is sent to the anchor base station of the terminal.

Downstream EDT is triggered by the arrival of downstream data. According to the current state of the terminal, the method can be divided into downlink EDT triggering of an idle state terminal and downlink EDT triggering of a non-activated state terminal.

When a terminal is in an idle state, the core network side does not have the information of the accurate home base station of the terminal, and does not have a core network side data transmission path for the terminal. When the downlink data of the terminal reaches a core network node, a core network UPF (User Plane Function) entity and an AMF (Access and Mobility management Function) entity complete interaction, and the AMF entity initiates a process of paging the terminal to a base station within a TA (Tracking Area) range of the terminal. Optionally, the AMF may carry a downlink early data transmission indication in the paging message according to the characteristic of the arrival data, so as to indicate that the data may apply the downlink EDT procedure.

Optionally, the sending a paging message to a base station within a tracking area of the terminal includes:

and sending a paging message to a base station within the tracking area range of the terminal according to the QoS transmission characteristic of a data packet of downlink data of the terminal and/or the size of the data packet.

Wherein the paging message carries a downlink early data transmission indication.

For example, if the delay requirement meets a certain condition, and/or the block error rate meets a certain condition, the paging message carries a downlink early data transmission indication; for another example, if the data packet is smaller than a certain threshold, which may be based on an algorithm of the core network itself or may be from an interaction process with the base station, the paging message carries a downlink early data transmission indication.

When the terminal is in the inactive state, for the core network node, the path of the terminal data path exists, when the downlink data of the terminal arrives, the core network node directly sends the data to the anchor point base station of the corresponding terminal through the existing data path, the anchor point base station of the terminal receives the data, and because the terminal is currently in the active state, the anchor point base station of the terminal initiates the RAN paging process.

Different from the idle state, the downlink data of the terminal in the inactive state directly reaches the anchor base station, so that the anchor base station can directly know the QoS attribute, the size and the like of the data packet, and then decide whether to initiate the paging process carrying the downlink early data transmission indication according to the algorithm and the condition of the anchor base station.

It should be noted that the terminal Identifier carried by the idle paging is an S-TMSI (System architecture temporal Mobile Station Identifier), and the Inactive paging is an I-RNTI (Inactive Radio Network temporal Identifier).

In summary, in the embodiments of the present invention, the arrival of the downlink data at the terminal can directly trigger the paging process, thereby reducing the signaling overhead caused by downlink data transmission and improving the transmission efficiency and system performance.

As shown in fig. 8, an embodiment of the present invention further provides a terminal 800, including:

an access module 801, configured to receive a paging message of the terminal, and initiate a random access process according to the paging message;

a receiving module 802, configured to receive downlink data of the terminal sent by a serving base station of the terminal in the random access process.

Optionally, in the above embodiment of the present invention, the receiving module includes:

a first receiving submodule, configured to receive a downlink radio resource control RRC message sent by the serving base station in the random access process;

Optionally, in the foregoing embodiment of the present invention, the downlink RRC message includes:

an early data transfer complete message or an RRC connection release message.

the second receiving submodule is used for receiving the downlink data of the terminal through the message 4 of the four-step random access; or receiving downlink data of the terminal through the message B of the two-step random access.

Optionally, in the foregoing embodiment of the present invention, the terminal further includes:

a recovery module, configured to recover, by the terminal, the configuration of the DRB when the received paging message carries a downlink early data transmission indication;

or, the terminal recovers the configuration of the DRB when receiving the paging message of the terminal and receiving a system message indicating the start of the downlink early data transmission function;

or, the method and the device are configured to, when the paging message of the terminal is received and the version or capability information of the terminal meets a preset condition, the terminal recovers the configuration of the DRB.

Optionally, in the foregoing embodiment of the present invention, in a case that the random access process is four-step random access, the terminal further includes:

a length determining module, configured to determine, when the received paging message carries a downlink early data transmission indication, a length of a contention resolution timer dedicated for downlink early data transmission in the random access process;

or, the contention resolution timer is configured to determine, when receiving the paging message of the terminal and receiving a system message indicating that a downlink early data transmission function is started, to use a contention resolution timer length dedicated to downlink early data transmission in the random access process;

or, the method is configured to determine, in a case that the paging message of the terminal is received, to use a contention resolution timer length dedicated to downlink early data transmission in the random access procedure.

Optionally, in the foregoing embodiment of the present invention, in a case that the random access process is two-step random access, the message B further carries an uplink grant resource or an uplink feedback position; the terminal further comprises:

a feedback module, configured to send, by the terminal, feedback information to the base station on the uplink grant resource or the uplink feedback position carried in the message B when contention resolution is successful; the feedback information is used for indicating the terminal to successfully receive the message B.

a third receiving submodule, configured to determine a radio network temporary identifier RA-RNTI for random access of scheduling of the message B according to the time-frequency position of the random access preamble sent by the terminal;

a fourth receiving submodule, configured to receive the message B scheduled by using an RA-RNTI, where the message B carries a cell radio network temporary identifier C-RNTI of the terminal;

and the fifth receiving submodule is used for receiving the downlink data of the terminal, which is sent by the serving base station through the downlink control channel scrambled by the C-RNTI of the terminal.

Optionally, in the above embodiment of the present invention, the second receiving sub-module includes:

a first unit, configured to determine a radio network temporary identifier RA-RNTI for random access of scheduling of a message B according to a time-frequency position of a random access preamble sent by the terminal;

a second unit, configured to receive the message B scheduled by using the RA-RNTI, where the message B carries a radio frame number and downlink data of a random access preamble sent by the terminal;

and the third unit is used for determining whether the message B is the message B sent to the terminal according to the radio frame number of the random access preamble sent by the terminal and the RA-RNTI.

the first uplink transmission module is configured to initiate an uplink early data transmission process by the terminal and perform uplink data transmission by using at least one DRB or at least one RRC message when there is uplink data to be transmitted.

Optionally, in the above embodiment of the present invention, the transmission pipeline between the base station and the core network for the terminal is reserved for a preset time period.

Optionally, in the embodiment of the present invention, the message 4 of the four-step random access or the message B of the two-step random access carries the uplink grant resource allocated to the terminal; or, the base station distributes uplink authorization resources for the terminal through a downlink control channel;

the terminal further comprises:

and the second uplink transmission module is used for the terminal to send uplink data to the base station by using the allocated uplink authorized resource.

Optionally, in the foregoing embodiment of the present invention, if the base station allocates the uplink grant resource to the terminal through the downlink control channel, the message 4 of the four-step random access or the message B of the two-step random access also carries indication information, where the indication information is used to indicate the terminal to continuously monitor the downlink control channel subsequently;

wherein the indication information is indicated by RRC signaling of message 4 or message B; or, the indication information is indicated by the MAC information of message 4 or message B; alternatively, the indication information is indicated by new RRC signaling in message 4 or message B.

a third uplink transmission module, configured to send a buffer status report with a buffer status of zero to the base station after the terminal completes transmission of uplink data, where the buffer status report with the buffer status of zero is used to indicate that there is no uplink data transmission subsequently; or, after the terminal completes the transmission of the uplink data, indicating that no uplink data is transmitted subsequently by using the allocated part of the uplink grant resources.

It should be noted that, the terminal provided in the embodiments of the present invention is a terminal capable of executing the data transmission method, and all embodiments of the data transmission method are applicable to the terminal and can achieve the same or similar beneficial effects.

Preferably, an embodiment of the present invention further provides a terminal, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the data transmission method embodiment, and can achieve the same technical effect, and details are not repeated here to avoid repetition.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the data transmission method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 9, an embodiment of the present invention further provides a base station 900, where the base station is a serving base station of a terminal, and the base station includes:

a paging sending module 901, configured to send a paging message to a terminal;

a data sending module 902, configured to send downlink data of the terminal to the terminal in a random access process initiated by the terminal according to the paging message.

Optionally, in the foregoing embodiment of the present invention, the data sending module includes:

the first sub-module is used for sending a downlink RRC message to the terminal in the random access process initiated by the terminal according to the paging message;

an early data transfer complete message or an RRC connection release message.

the second submodule is used for sending the downlink data of the terminal through the message 4 of the four-step random access; or,

Optionally, in the foregoing embodiment of the present invention, in a case that the random access process is two-step random access, the message B further carries an uplink grant resource or an uplink feedback position; the base station further comprises:

and the feedback receiving module is used for receiving feedback information sent by the terminal on the uplink authorized resource or the uplink feedback position carried by the message B, wherein the feedback information is used for indicating the terminal to successfully receive the message B.

a third sub-module, configured to determine, according to a time-frequency position of a random access preamble sent by the terminal, a radio network temporary identifier RA-RNTI for random access used for scheduling of the message B;

the fourth sub-module is used for sending the message B, and the message B carries the cell radio network temporary identifier C-RNTI of the terminal;

and the fifth sub-module is used for sending the downlink data of the terminal by using the downlink control channel scrambled by the C-RNTI of the terminal.

Optionally, in the foregoing embodiment of the present invention, the message B of the two-step random access also carries a radio frame number for sending a random access preamble.

Optionally, in the foregoing embodiment of the present invention, the base station further includes:

the first uplink module is configured to receive uplink data transmitted by the terminal using at least one DRB or at least one RRC message in an initiated uplink early data transmission process when the terminal has uplink data to be transmitted.

the base station further comprises:

and the second uplink module is used for receiving uplink data sent by the terminal on the allocated uplink authorized resource.

a third uplink module, configured to receive a buffer status report with a buffer status of zero sent by a terminal, where the buffer status report with the buffer status of zero is used to indicate that there is no uplink data transmission subsequently;

or, after the terminal uses the allocated part of uplink grant resources to transmit uplink data, confirming that no uplink data is transmitted subsequently.

the terminal comprises a first module, a second module and a third module, wherein the first module is used for receiving the identity information of the terminal sent by the terminal;

a second module, configured to determine, according to the identity information of the terminal, that the terminal is a terminal that carries an indication of early downlink data transmission in a paging message sent by a core network device, or that the terminal is a terminal of a preset type;

a third module, configured to request downlink data of the terminal from a core network device through an interface between the core network device and a base station;

and the fourth module is used for receiving the downlink data of the terminal sent by the core network equipment.

Optionally, in the foregoing embodiment of the present invention, an interface between the core network device and the base station is an N2 interface, and the base station further includes:

a fifth module, configured to receive an N2 connection release signaling sent by a core network device.

a sixth module, configured to receive identity information of a terminal sent by the terminal;

a seventh module, configured to determine an anchor base station of the terminal according to the identity information of the terminal;

an eighth module, configured to request context information of the terminal from the anchor base station;

a ninth module, configured to receive context information of the terminal and downlink data of the terminal, which are fed back after the anchor base station performs security verification on the terminal.

a tenth module, configured to initiate a terminal path switching request to a core network device, where the path switching request is used to request that the serving base station be updated to a new anchor base station of the terminal;

an eleventh module, configured to receive a path switching request acknowledgement sent by the core network device;

a twelfth module, configured to send a context release signaling to an original anchor point base station of the terminal, where the context release signaling is used to instruct the original anchor point base station to delete the context information of the terminal.

Optionally, in the foregoing embodiment of the present invention, the paging sending module includes:

the first paging submodule is used for receiving a paging message sent by core network equipment or an anchor point base station of the terminal;

and the second paging submodule is used for sending the paging message to the terminal on an air interface according to the paging message.

Optionally, in the foregoing embodiment of the present invention, a paging code word of the terminal in the paging message carries the downlink early data transmission indication;

or,

and the target domain in the paging message is used for carrying the downlink early data transmission indication.

It should be noted that, the base station provided in the embodiments of the present invention is a base station capable of executing the data transmission method, and all embodiments of the data transmission method are applicable to the base station and can achieve the same or similar beneficial effects.

Preferably, an embodiment of the present invention further provides a base station, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements the processes of the data transmission method embodiment, and can achieve the same technical effects, and details are not repeated here to avoid repetition.

As shown in fig. 10, an embodiment of the present invention further provides a core network device 100, including:

a sending module 110, configured to send a paging message to a base station within a tracking area range of a terminal when downlink data of the terminal arrives;

Optionally, in the foregoing embodiment of the present invention, the sending a paging message to a base station in a tracking area range of the terminal includes:

It should be noted that the core network device provided in the embodiments of the present invention is a core network device capable of executing the above paging method, and all embodiments of the above paging method are applicable to the core network device and can achieve the same or similar beneficial effects.

Preferably, an embodiment of the present invention further provides a core network device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the foregoing paging method embodiment, and can achieve the same technical effect, and details are not repeated here to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the foregoing paging method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

Fig. 11 is a schematic diagram of a hardware structure of a terminal for implementing various embodiments of the present invention, where the terminal 200 includes, but is not limited to: radio frequency unit 201, network module 202, audio output unit 203, input unit 204, sensor 205, display unit 206, user input unit 207, interface unit 208, memory 209, processor 210, and power supply 211. Those skilled in the art will appreciate that the terminal structure shown in fig. 11 does not constitute a limitation of the terminal, and that the terminal may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The radio frequency unit 201 is configured to receive a paging message of the terminal, and the processor 210 initiates a random access process according to the paging message; the radio frequency unit 201 is further configured to receive downlink data of the terminal sent by a serving base station of the terminal in the random access process;

It should be understood that, in the embodiment of the present invention, the radio frequency unit 201 may be used for receiving and sending signals during a message transmission and reception process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 210; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 201 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 201 can also communicate with a network and other devices through a wireless communication system.

The terminal provides the user with wireless broadband internet access via the network module 202, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 203 may convert audio data received by the radio frequency unit 201 or the network module 202 or stored in the memory 209 into an audio signal and output as sound. Also, the audio output unit 203 may also provide audio output related to a specific function performed by the terminal 200 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 203 includes a speaker, a buzzer, a receiver, and the like.

The input unit 204 is used to receive an audio or video signal. The input Unit 204 may include a Graphics Processing Unit (GPU) 2041 and a microphone 2042, and the Graphics processor 2041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 206. The image frames processed by the graphic processor 2041 may be stored in the memory 209 (or other storage medium) or transmitted via the radio frequency unit 201 or the network module 202. The microphone 2042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 201 in case of a phone call mode.

The terminal 200 also includes at least one sensor 205, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 2061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 2061 and/or the backlight when the terminal 200 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 205 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 206 is used to display information input by the user or information provided to the user. The Display unit 206 may include a Display panel 2061, and the Display panel 2061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 207 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 207 includes a touch panel 2071 and other input devices 2072. Touch panel 2071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 2071 (e.g., user operation on or near the touch panel 2071 using a finger, a stylus, or any other suitable object or attachment). The touch panel 2071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 210, and receives and executes commands sent by the processor 210. In addition, the touch panel 2071 may be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 207 may include other input devices 2072 in addition to the touch panel 2071. In particular, the other input devices 2072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not further described herein.

Further, a touch panel 2071 may be overlaid on the display panel 2061, and when the touch panel 2071 detects a touch operation on or near the touch panel 2071, the touch panel is transmitted to the processor 210 to determine the type of the touch event, and then the processor 210 provides a corresponding visual output on the display panel 2061 according to the type of the touch event. Although the touch panel 2071 and the display panel 2061 are shown as two separate components in fig. 11 to implement the input and output functions of the terminal, in some embodiments, the touch panel 2071 and the display panel 2061 may be integrated to implement the input and output functions of the terminal, and this is not limited herein.

The interface unit 208 is an interface for connecting an external device to the terminal 200. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 208 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 200 or may be used to transmit data between the terminal 200 and an external device.

The memory 209 may be used to store software programs as well as various data. The memory 209 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 209 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 210 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 209 and calling data stored in the memory 209, thereby performing overall monitoring of the terminal. Processor 210 may include one or more processing units; preferably, the processor 210 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 210.

The terminal 200 may further include a power source 211 (such as a battery) for supplying power to various components, and preferably, the power source 211 may be logically connected to the processor 210 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the terminal 200 includes some functional modules that are not shown, and are not described in detail herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A data transmission method is applied to a terminal, and is characterized by comprising the following steps:

2. The method of claim 1, wherein the paging message carries a downlink early data transmission indication.

3. The method of claim 1, wherein the receiving downlink data of the terminal sent by a serving base station of the terminal in the random access procedure comprises:

4. The method of claim 3, wherein the downlink RRC message comprises:

an early data transfer complete message or an RRC connection release message.

5. The method of claim 1, wherein receiving downlink data of the terminal sent by a serving base station of the terminal comprises:

6. The method according to claim 3 or 5, wherein the downlink data of the terminal is transmitted in the form of Data Radio Bearer (DRB) in case that the terminal is in the inactive state.

7. The method of claim 6, further comprising:

under the condition that the received paging message carries a downlink early data transmission indication, the terminal recovers the configuration of the DRB;

or,

under the condition that the paging message of the terminal is received and the system message indicating the start of the downlink early data transmission function is received, the terminal recovers the configuration of the DRB;

or,

and when the paging message of the terminal is received and the version or capability information of the terminal meets the preset conditions, the terminal recovers the configuration of the DRB.

8. The method according to claim 1, wherein in case that the random access procedure is four-step random access, the method further comprises:

determining the length of a contention resolution timer dedicated for downlink early data transmission in the random access process under the condition that the received paging message carries a downlink early data transmission indication;

or,

determining a length of a contention resolution timer dedicated for downlink early data transmission in the random access process when a paging message of the terminal is received and a system message indicating the start of a downlink early data transmission function is received;

or,

and under the condition of receiving the paging message of the terminal, determining the length of a contention resolution timer special for downlink early data transmission in the random access process.

9. The method according to claim 5, wherein in case that the random access procedure is two-step random access, the message B further carries an uplink grant resource or an uplink feedback position; the method further comprises the following steps:

10. The method according to claim 1, wherein in a case that the random access procedure is two-step random access, the receiving downlink data of the terminal sent by a serving base station of the terminal comprises:

11. The method according to claim 5, wherein in a case that the random access procedure is two-step random access, the receiving downlink data of the terminal through message B of the two-step random access comprises:

12. The method of claim 1, wherein after receiving downlink data of the terminal sent by a serving base station of the terminal, the method further comprises:

13. The method of claim 1, further comprising:

and reserving a preset time period for a transmission pipeline of the terminal between the base station and the core network.

14. The method according to claim 5, wherein the message 4 of the four-step random access or the message B of the two-step random access carries the uplink grant resource allocated to the terminal; or, the base station distributes uplink authorization resources for the terminal through a downlink control channel;

the method further comprises the following steps:

15. The method of claim 14, wherein if the base station allocates the uplink grant resource to the terminal through the downlink control channel, the message 4 of the four-step random access or the message B of the two-step random access further carries indication information, and the indication information is used to indicate the terminal to continuously monitor the downlink control channel subsequently;

16. The method of claim 14, further comprising:

or,

17. A data transmission method, a serving base station for an application terminal, comprising:

sending a paging message to a terminal;

18. The method of claim 17, wherein the paging message carries a downlink early data transmission indication.

19. The method of claim 17, wherein sending downlink data of a terminal to the terminal in a random access procedure initiated by the terminal according to the paging message comprises:

20. The method of claim 19, wherein the downlink RRC message comprises:

an early data transfer complete message or an RRC connection release message.

21. The method of claim 17, wherein sending downlink data of the terminal to the terminal comprises:

sending downlink data of the terminal through a message 4 of four-step random access; or,

22. The method according to claim 19 or 21, wherein the downlink data of the terminal is transmitted in the form of a Data Radio Bearer (DRB) when the terminal is in an inactive state.

23. The method according to claim 21, wherein in a case that the random access procedure is two-step random access, the message B further carries an uplink grant resource or an uplink feedback position; the method further comprises the following steps:

24. The method according to claim 17, wherein in a case that the random access procedure is a two-step random access, the sending downlink data of the terminal to the terminal includes:

25. The method of claim 21, wherein the message B of the two-step random access further carries a radio frame number for transmitting a random access preamble.

26. The method of claim 17, further comprising:

27. The method of claim 26, further comprising:

28. The method of claim 21, wherein the message 4 of the four-step random access or the message B of the two-step random access carries uplink grant resources allocated to the terminal; or, the base station distributes uplink authorization resources for the terminal through a downlink control channel;

the method further comprises the following steps:

29. The method of claim 28, wherein if the base station allocates the uplink grant resource to the terminal through the downlink control channel, the message 4 of the four-step random access or the message B of the two-step random access further carries indication information, and the indication information is used to indicate the terminal to continuously monitor the downlink control channel subsequently;

30. The method of claim 28, further comprising:

or,

31. The method of claim 19, wherein before the sending the downlink data of the terminal to the terminal, the method further comprises:

receiving identity information of a terminal, which is sent by the terminal;

and receiving downlink data of the terminal sent by the core network equipment.

32. The method of claim 31, wherein the interface between the core network device and the base station is an N2 interface, the method further comprising:

33. The method of claim 17, wherein before sending the downlink data of the terminal to the terminal, the method further comprises:

receiving identity information of a terminal, which is sent by the terminal;

requesting context information of the terminal from the anchor base station;

34. The method of claim 33, further comprising:

35. The method of claim 17, wherein sending the paging message to the terminal comprises:

36. The method of claim 35, wherein a paging code word of the terminal in the paging message carries the downlink early data transmission indication;

or,

37. A paging method is applied to core network equipment, and is characterized by comprising the following steps:

or,

38. The method of claim 37, wherein sending the paging message to the base stations within the tracking area of the terminal comprises:

39. The method of claim 37, wherein the paging message carries a downlink early data transmission indication.

40. A terminal, comprising:

41. A base station, the base station being a serving base station for a terminal, comprising:

the paging sending module is used for sending a paging message to the terminal;

42. A core network device, comprising:

43. An apparatus comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the data transmission method according to any one of claims 1 to 16; or, the computer program when being executed by the processor realizes the steps of the data transmission method according to any one of claims 17 to 36; alternatively, the computer program when executed by the processor implements the steps of the paging method according to any one of claims 37 to 39.

44. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the data transmission method according to any one of claims 1 to 16; or, the computer program when being executed by a processor realizes the steps of the data transmission method according to any one of claims 17 to 36; alternatively, the computer program when executed by a processor implements the steps of the paging method according to any one of claims 37 to 39.