CN117459991A

CN117459991A - Data transmission method and device

Info

Publication number: CN117459991A
Application number: CN202210833894.7A
Authority: CN
Inventors: 黄曲芳
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2024-01-26

Abstract

The embodiment of the application provides a data transmission method and device, which relate to the technical field of communication and comprise the following steps: the UE acquires second satellite calendar information, wherein the reference moment of the second satellite calendar information is positioned after the reference moment of the first satellite calendar information currently adopted by the UE and before the failure moment; initiating a random access process according to the second satellite ephemeris information, and suspending uplink data transmission in the random access process; and after the random access process is successful, recovering the uplink data transmission. In the embodiment of the application, the uplink data transmission is suspended in the time period when the satellite ephemeris information is updated by the UE, and the uplink data transmission is restarted after the random access is successful, so that the invalid transmission of the air interface resource can be effectively avoided, and the utilization rate of the air interface resource is improved.

Description

Data transmission method and device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a data transmission method and device.

Background

Non-terrestrial network (Non-Terrestrial Networks, NTN) systems generally provide communication services to terrestrial users by means of satellite communication, which is not limited by the user region compared with terrestrial cellular communication networks, and has been widely used in many fields.

In the current technical standard, NTN uplink coverage enhancement is introduced, and the main mode of coverage enhancement is repeated transmission, that is, the User Equipment (UE) transmits the same Transport Block (TB) on the air interface more times, and the receiver combines the data received multiple times, so as to increase the probability of correct decoding.

However, in the repeated transmission process, if the valid time of the satellite ephemeris information corresponding to the UE currently is overtime, the UE empties the uplink hybrid automatic repeat request (Hybrid Auto Repeat Request, abbreviated as HARQ) buffer, and does not repeat the transmission, and the receiver can not decode the TB that has been transmitted before, so that the air interface resource is not utilized effectively, and the utilization rate of the air interface resource is reduced.

Disclosure of Invention

The embodiment of the application provides a data transmission method and device, which can effectively avoid invalid transmission of air interface resources and improve the utilization rate of the air interface resources.

In a first aspect, an embodiment of the present application provides a data transmission method, which is applied to a UE, where the method includes:

acquiring second satellite calendar information, wherein the reference time of the second satellite calendar information is positioned after the reference time of the first satellite calendar information currently adopted by the UE and before the failure time corresponding to the first satellite calendar information;

Initiating a random access process according to the second satellite ephemeris information, and suspending uplink data transmission in the random access process;

and after the random access process is successful, recovering the uplink data transmission.

In some embodiments, the acquiring the second satellite ephemeris information comprises:

acquiring a system information block (System Information Block, SIB for short) broadcasted by network equipment according to the remaining effective time of the first satellite ephemeris information;

and determining the second satellite ephemeris information according to the SIB.

In some embodiments, the initiating a random access procedure according to the second satellite ephemeris information and suspending uplink data transmission in the random access procedure includes:

after a pause instruction is sent to network equipment at a first moment, a random access preamble is sent to the network equipment at a second moment, and the uplink data transmission is started to be paused at the first moment or the second moment;

the first time is the reference time of the second satellite calendar information or is located after the reference time of the second satellite calendar information, and the second time is located after the first time.

In some embodiments, further comprising:

if the uplink data transmission is started to be suspended at the first time, the suspension instruction is used for instructing the network equipment that the UE starts to suspend the uplink data transmission at the first time;

and if the uplink data transmission is started to be suspended at the second moment, the suspension instruction is used for instructing the network equipment that the UE starts to suspend the uplink data transmission at the second moment.

In some embodiments, the pause indication is further for:

indicating the network equipment that the UE starts to suspend uplink control information transmission at the first time or the second time;

and/or instruct the network device to start suspending downlink data transmission and/or downlink control information transmission at the first time or the second time.

transmitting a random access request to a network device at a first moment, after receiving a (Physical Downlink Control Channel, abbreviated as PDCCH) command transmitted by the network device at a second moment, transmitting a random access preamble to the network device at a third moment, and starting to suspend the uplink data transmission at any one moment of the first moment, the second moment and the third moment;

The first time is a reference time of the second satellite calendar information or is located after the reference time of the second satellite calendar information, the second time is located after the first time, and the third time is located after the second time.

and receiving radio resource control (Radio Resource Control, abbreviated as RRC message) sent by the network equipment, wherein the RRC message comprises the second satellite calendar information.

receiving the RRC message sent by the network equipment at a first moment, receiving a PDCCH command sent by the network equipment at a second moment, sending a random access preamble to the network equipment at a third moment, and starting to suspend the uplink data transmission at any one moment of the first moment, the second moment and the third moment;

receiving the RRC message sent by the network equipment at a first moment, wherein the RRC message comprises a second moment;

transmitting a random access preamble to the network device at the second time, and starting to suspend the uplink data transmission at the first time or the second time;

In some embodiments, further comprising:

after receiving the RRC message sent by the network device at the first time, if the RRC message does not include the second time, starting to suspend uplink data transmission at the first time, and sending a random access preamble to the network device at a latest random access opportunity.

In some embodiments, initiating a random access procedure according to the second satellite ephemeris information comprises:

And from the moment of initiating the random access process, determining the uplink transmitting time by adopting the second satellite ephemeris information.

In some embodiments, suspending uplink data transmission during the random access procedure includes:

and before suspending the uplink data transmission, if the first satellite calendar information fails, suspending the uplink data transmission when the first satellite calendar information fails.

In a second aspect, in an embodiment of the present application, a data transmission apparatus is provided and applied to a UE, where the apparatus includes:

the acquisition module is used for acquiring second satellite calendar information, wherein the reference moment of the second satellite calendar information is positioned after the reference moment of the first satellite calendar information currently adopted by the UE and before the failure moment corresponding to the first satellite calendar information;

the first execution module is used for initiating a random access process according to the second satellite ephemeris information and suspending uplink data transmission in the random access process;

and the second execution module is used for recovering the uplink data transmission after the random access process is successful.

In some embodiments, the acquisition module is to:

Acquiring a system information block SIB broadcasted by network equipment according to the remaining effective time of the first satellite ephemeris information;

In some embodiments, the first execution module is to:

In some embodiments, if the suspension of the uplink data transmission is started at the first time, the suspension instruction is used to instruct the network device that the UE starts to suspend the uplink data transmission at the first time;

In some embodiments, the pause indication is further for:

In some embodiments, the first execution module is to:

transmitting a random access request to the network equipment at a first moment, after receiving a PDCCH command transmitted by the network equipment at a second moment, transmitting a random access preamble to the network equipment at a third moment, and starting to suspend the uplink data transmission at any one moment of the first moment, the second moment and the third moment;

In some embodiments, the acquisition module is to:

and receiving an RRC message sent by the network equipment, wherein the RRC message comprises the second satellite calendar information.

In some embodiments, the first execution module is to:

In some embodiments, the first execution module is further to:

In a third aspect, in an embodiment of the present application, a user equipment is provided, including: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executes computer-executable instructions stored by the memory, causing the at least one processor to perform the data transmission method as provided in the first aspect.

In a fourth aspect, in an embodiment of the present application, there is provided a computer-readable storage medium, where computer-executable instructions are stored, and when executed by a processor, implement a data transmission method as provided in the first aspect.

In a fifth aspect, embodiments of the present application provide a computer program product comprising a computer program which, when executed by a processor, implements a data transmission method as provided in the first aspect.

In a sixth aspect, in an embodiment of the present application, there is provided a chip including: a processor and a memory; the memory is used for storing executable instructions of the processor; wherein the processor is configured to implement the data transmission method provided in the first aspect via execution of the executable instructions.

According to the data transmission method and the data transmission device, the uplink data transmission is suspended in the time period when the satellite ephemeris information is updated by the UE, and the uplink data transmission is restarted after the random access is successful, so that the invalid transmission of the air interface resources can be effectively avoided, the utilization rate of the air interface resources is improved, and the improvement effect is more obvious in an uplink coverage enhancement scene.

Drawings

FIG. 1 is a schematic diagram of a Non-terrestrial network (Non-Terrestrial Networks, NTN) system according to an embodiment of the present disclosure;

fig. 2 is a schematic architecture diagram of another NTN system according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an effective time length of satellite ephemeris information provided in an embodiment of the application;

FIG. 4 is a schematic diagram of the effective time length of another satellite ephemeris information provided in an embodiment of the disclosure;

fig. 5 is a schematic diagram of data transmission provided in an embodiment of the present application;

fig. 6 is a flow chart of a data transmission method provided in an embodiment of the present application;

fig. 7 is a timing diagram of a random access procedure according to an embodiment of the present application;

fig. 8 is a timing diagram of a random access procedure according to the second embodiment of the present application;

fig. 9 is a timing diagram III of a random access procedure provided in an embodiment of the present application;

fig. 10 is a timing diagram of a random access procedure according to an embodiment of the present application;

fig. 11 is a schematic program module of a data transmission device according to an embodiment of the present application;

fig. 12 is a schematic hardware structure of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The embodiments of the present application may be applied to various communication systems, such as NTN systems, and the like.

Among them, NTN systems generally provide communication services to terrestrial users by means of satellite communication. Satellite communications have many unique advantages over terrestrial cellular communication networks. For example, satellite communications are not limited by the user region, and general terrestrial communications cannot cover areas where communication devices cannot be set up or communication is not covered due to rarity of population, such as oceans, mountains, deserts, etc., while for satellite communications, each corner on the earth can be theoretically covered by satellite communications because one satellite can cover a larger ground surface and the satellite can orbit around the earth.

Communication satellites are classified into Low Earth Orbit (LEO) satellites, medium Earth Orbit (MEO) satellites, geosynchronous Orbit (Geostationary Earth Orbit, GEO) satellites, high elliptical Orbit (High Elliptical Orbit, HEO) satellites, and the like according to the Orbit heights.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form tens or hundreds of beams to cover the ground; a satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter.

In the NTN system, the Round Trip Time (RTT) from the terminal device to the access network device includes two parts, one is the RTT of the terminal device to the satellite link, the other is the RTT of the satellite to the access network device link, and the other is the common Time synchronization (common Time Alignment, common TA) part. The common TA part may be partly compensated by the access network device and partly by the terminal device. The part compensated by the terminal device is sent to the terminal device via a system message.

The network device (access network device or satellite) broadcasts ephemeris information of the satellite in addition to the common TA that the terminal device needs to compensate for, to help the terminal device acquire the position of the satellite in order to calculate the RTT of the terminal device to the satellite. Both the common TA and the satellite ephemeris information change due to the mobility of the satellites, so the satellite ephemeris information and the common TA broadcast in the system message have a validity period, which is called UL synchronization validity duration (uplink synchronization validity period). The satellite ephemeris information and common TA share one UL synchronization validity duration. The value of UL synchronization validity duration is broadcast by the network device to the terminal device via the SIB.

The terminal device initiates an uplink synchronization validation time (UL synchronization validity timer) based on an epoch time (start validation time) corresponding to the common TA and satellite ephemeris information in the broadcast message.

Among them, there are three indication modes:

1. system message explicit indication: a system frame number (System Frame Number, abbreviated SFN) and subframe number (subframe number) are explicitly broadcast in the system message to indicate the epoch time.

2. The system message implicitly indicates: the end position of an SI window (window) of system information (System Information, SI) including satellite ephemeris information and common TA information is referred to as epoch time.

3. Dedicated signaling indicates: the network device provides the SFN and subframe number to the terminal device through dedicated signaling to indicate the epoch time.

Referring to fig. 1, fig. 1 is a schematic architecture diagram of an NTN system according to an embodiment of the present application, where a communication satellite is a transparent forwarding (transparent payload) satellite. As shown in fig. 1, the NTN system includes: terminal equipment 10, satellites 20, NTN gateway 30, access network equipment 40 and core network equipment 50.

Communication between the terminal device 10 and the access network device 40 may be performed via an air interface, such as the Uu interface. In the architecture shown in fig. 1, the access network device 40 may be deployed on the ground, and uplink and downlink communications between the terminal device 10 and the access network device 40 may be relayed through the satellite 20 and the NTN gateway 30 (typically located on the ground). Taking uplink transmission as an example, the terminal device 10 sends an uplink signal to the satellite 20, the satellite 20 forwards the uplink signal to the NTN gateway 30, the NTN gateway 30 forwards the uplink signal to the access network device 40, and the access network device 40 subsequently sends the uplink signal to the core network device 50. Taking downlink transmission as an example, the downlink signal from the core network device 50 is sent to the access network device 40, the access network device 40 sends the downlink signal to the NTN gateway 30, the NTN gateway 30 forwards the downlink signal to the satellite 20, and the satellite 20 forwards the downlink signal to the terminal device 10.

In this NTN system, the satellite 20 has the functions of frequency conversion and signal amplification, the satellite 20 does not demodulate the signal received by the network device 40, and the satellite 20 is similar to a repeater.

Referring to fig. 2, fig. 2 is a schematic architecture diagram of another NTN system according to an embodiment of the present application, where the communication satellite is a regenerative forwarding (regenerative payload) satellite. As shown in fig. 2, the NTN system includes: a terminal device 10, a satellite 20, an NTN gateway 30 and a core network device 50.

In the architecture shown in fig. 2, the functionality of the access network device 40 is integrated on the satellite 20, i.e. the satellite 20 is provided with the functionality of the access network device 40. Communication between the terminal device 10 and the satellite 20 may be via an air interface, such as the Uu interface. Communication between the satellite 20 and the NTN gateway 30 (typically located on the ground) may be via a satellite radio interface (Satellite Radio Interface, SRI for short). In the NTN system, a satellite receives a signal, demodulates and decodes the signal, re-encodes and modulates the signal, and transmits the regenerated signal through a satellite frequency band.

In the architecture shown in fig. 2, taking uplink transmission as an example, the terminal device 10 sends an uplink signal to the satellite 20, the satellite 20 forwards the uplink signal to the NTN gateway 30, and the NTN gateway 30 sends the uplink signal to the core network device 50. Taking downlink transmission as an example, a downlink signal from the core network device 50 is sent to the NTN gateway 30, and the NTN gateway 30 forwards the downlink signal to the satellite 20, and then the satellite 20 forwards the downlink signal to the terminal device 10.

In the network architecture shown in fig. 1 and 2 described above, the access network device 40 is a device for providing wireless communication services to the terminal device 10. A connection may be established between the access network device 40 and the terminal device 10 so that communication, including interaction of signaling and data, may take place over the connection. The number of access network devices 40 may be plural, and communication between two adjacent access network devices 40 may be performed by wired or wireless means. The terminal device 10 may switch between different access network devices 40, i.e. establish a connection with different access network devices 40.

Taking a cellular communication network as an example, the access network device 40 in the cellular communication network may be a base station. A base station is a device deployed in an access network to provide wireless communication functionality for a terminal device 10. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different Radio access technologies, the names of devices with base station functions may be different, for example, in the fifth generation mobile communication technology (5 th Generation Mobile Communication Technology, abbreviated as 5G) New air interface (NR) system, called evolved node B (next Generation Node B, abbreviated as gndeb or gNB). As communication technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices for providing the terminal device 10 with a wireless communication function are collectively referred to as a base station or an access network device.

The terminal device 10 referred to in the embodiments of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, which have wireless communication functions. The terminal device 10 may also be referred to as a User Equipment (UE), a Mobile Station (MS), or the like. For convenience of description, in the embodiments of the present disclosure, the above-mentioned devices are collectively referred to as terminal devices. In the embodiments of the present disclosure, some places use "UE" to represent "terminal device". In the disclosed embodiments, a "network device" may be an access network device (e.g., a base station) or a satellite.

In addition, taking a 5G NTN system as an example, a plurality of satellites 20 may be included in the NTN system. One satellite 20 may cover a range of ground areas and provide wireless communication services to the terminal devices 10 on that ground area. In addition, the satellites 20 may orbit the earth, and by deploying multiple satellites 20, communication coverage of different areas of the earth's surface may be achieved.

The technical solution described in the embodiments of the present application may be applied to a long term evolution (Long Term Evolution, LTE) system, a 5G system, a subsequent evolution system of a 5G NR system, or other communication systems, which is not limited in this application.

In the current technical standard, since the transmission delay of a satellite cell is much longer than that of a ground cell, when the UE transmits an uplink signal to the satellite, the timing advance of transmitting the uplink signal needs to be determined according to the transmission delay between itself and the satellite. The UE needs to calculate a time advance, including a random access preamble in random access, when transmitting all uplink signals to the satellite.

In order to calculate the transmission delay between the UE and the satellite, the UE needs to acquire two pieces of location information: the own geographic location information and the geometric location information of the satellites. The geographic position information of the UE may be obtained by a global positioning system (Global Positioning System, abbreviated as GPS), and the geometric position information of the satellite may be calculated by satellite ephemeris information.

Among these, satellite ephemeris information generally contains the following elements:

(1) A reference time; (2) at a reference time, the geometric position of the satellite; (3) Other parameters such as the speed of movement of the satellite, orbit, etc.; (4) the duration of time that the satellite ephemeris information is valid.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating an effective time length of satellite ephemeris information provided in an embodiment of the application.

In the satellite ephemeris information shown in fig. 3, the reference time is T1, and the effective period is T1 to T2; the UE may calculate the geometric position of the satellite at any time in the time period from T1 to T2 based on the geometric position of the satellite at T1 in the sky and other parameters.

After time t2, the UE needs to reacquire new satellite ephemeris information. The radio resource control (Radio Resource Control, RRC) layer of the UE maintains a timer, and starts the timer at a reference time T1 corresponding to the satellite ephemeris information, and indicates that the satellite ephemeris information held by the UE is valid during the running process of the timer; if the timer expires, the UE stops uplink transmission and clears the buffer of the uplink hybrid automatic repeat request (Hybrid Auto Repeat Request, HARQ for short) if the satellite ephemeris information corresponding to the UE is invalid.

In a 5G system, an IDLE (IDLE) UE may acquire satellite ephemeris information through a system broadcast message system information block type19 (System Information Block type, SIB19 for short); the UE in the connected state acquires satellite ephemeris information through SIB19 if a system broadcast message transmission is provided in a sub-band Part (BWP) of its operation, and acquires ephemeris through RRC dedicated signaling if no system broadcast message transmission is provided in the sub-band BWP of its operation.

In either of the two ways, the UE needs to continuously update the satellite ephemeris information to keep the corresponding ephemeris information valid.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating an effective time length of another satellite ephemeris information provided in an embodiment of the application.

In fig. 4, UE acquires satellite ephemeris information at time T1, where T1 is a reference time of the satellite ephemeris information; before the satellite ephemeris information fails, the UE acquires new satellite ephemeris information at a time T2, where T2 is a reference time of the new satellite ephemeris information.

In the calculation formula of the uplink transmission time advance TA of the UE, the uplink transmission time N is needed _TA Because the parameter is maintained by the base station, the initial value is calculated through random access, and then is maintained according to uplink transmission closed loop of the UE, N based on the old satellite ephemeris information _TA Cannot be applied to new satellite ephemeris information, and random access must be performed again after the new satellite ephemeris information is acquired. That is, in fig. 4, after the UE acquires the new satellite ephemeris information, the UE needs to access again through random access to continue transmitting uplink data using the new satellite ephemeris information.

In the existing related protocol, NTN uplink coverage enhancement is introduced, and the main mode of coverage enhancement is repeated transmission, that is, the UE transmits the same Transport Block (TB) on the air interface more times, and the receiver combines the data received multiple times, so as to increase the probability of correct decoding. This means that one TB will take longer for the HARQ process.

Referring to fig. 5, fig. 5 is a schematic diagram of data transmission provided in an embodiment of the present application.

In fig. 5, the same HARQ process is used for transmitting different data blocks, and before coverage enhancement is introduced, a TB can be successfully transmitted after N repeated transmissions on average, and the time that the same TB occupies the HARQ process is short; after coverage enhancement is introduced, for terminals in areas with imperfect coverage, a TB can be successfully transmitted after n+k repeated transmissions on average, and the time that the same TB occupies an HARQ process becomes long.

In the repeated transmission process, if the valid time of the satellite ephemeris information is overtime, the UE empties the HARQ buffer, so that the retransmission is not performed, the TB that has been transmitted before can not be decoded correctly, so that the air interface resources are not utilized effectively, and the utilization rate of the air interface resources is reduced.

In view of the above technical problems, the embodiments of the present application provide a data transmission method, in which a UE changes new satellite ephemeris information before the original satellite ephemeris information fails, in this process, HARQ transmission is suspended, and HARQ transmission is continued after the new satellite ephemeris information takes effect, so that invalid transmission of TB can be avoided, and air interface resource utilization rate is improved. The following will explain in detail the embodiments.

Referring to fig. 6, fig. 6 is a flow chart of a data transmission method provided in an embodiment of the present application.

In some embodiments, the data transmission method may be applied in UEs and network devices. Optionally, in the data transmission method provided by the present application, the action performed by the UE may be performed by the UE, or may be performed by a chip or a specific module in the UE, and the action performed by the network device may be performed by the network device, or may be performed by the chip or the specific module in the network device.

In some embodiments, the data transmission method includes:

s601, acquiring second satellite calendar information, wherein the reference time of the second satellite calendar information is positioned after the reference time of the first satellite calendar information currently adopted by the UE and before the failure time corresponding to the first satellite calendar information.

For better understanding of the embodiments of the present application, still referring to fig. 4, in fig. 4, it is assumed that the UE acquires the first satellite ephemeris information at time T1, where T1 is the reference time of the first satellite ephemeris information; before the failure moment corresponding to the first satellite calendar information, the UE acquires new second satellite calendar information at the moment T2, wherein T2 is the reference moment of the second satellite calendar information.

S602, initiating a random access process according to the second satellite ephemeris information, and suspending uplink data transmission in the random access process.

It can be appreciated that in the calculation formula of the uplink transmission time advance TA of the UE, the uplink transmission time N is required _TA Since this parameter is maintained by the base station, the initial value is calculated by random access, and then is maintained in closed loop according to the uplink transmission of the UE, N based on the old first satellite ephemeris information _TA The method cannot be applied to the new second satellite ephemeris information, namely, after acquiring the new second satellite ephemeris information, the UE needs to perform random access again.

In some embodiments of the present application, after acquiring the new second satellite ephemeris information, the UE initiates a random access procedure, and suspends uplink data transmission in the random access procedure.

Wherein, the above suspension of uplink data transmission can be understood as suspension of HARQ transmission.

S603, after the random access process is successful, the uplink data transmission is resumed.

In some embodiments of the present application, after the random access procedure is successful, the UE may continue to transmit uplink data using the new second satellite ephemeris information.

Alternatively, in some embodiments of the present application, the random access procedure described above may be considered successful when the UE receives either msg2/B (non-contention random access) or msg4 (contention random access).

According to the data transmission method provided by the embodiment of the application, the uplink data transmission is suspended in the time period when the satellite ephemeris information is updated by the UE, and the uplink data transmission is restarted after the random access is successful, so that the invalid transmission of air interface resources can be effectively avoided, the utilization rate of the air interface resources is improved, and the improvement effect is more obvious in an uplink coverage enhancement scene.

Based on what has been described in the above embodiments, in some embodiments, a UE in a connected state may acquire satellite ephemeris information by either of the following two ways:

mode one: acquiring new satellite ephemeris information through an SIB; mode two: new satellite ephemeris information is acquired through a dedicated RRC message.

In some embodiments, if the UE acquires the ephemeris information as soon as the UE uses the manner, the UE may acquire the new second ephemeris information through SIB19 before the old first ephemeris information fails.

The UE may be freely selected, because the network device may periodically broadcast SIB19, specifically, the moment of acquiring the new satellite ephemeris information.

Alternatively, the UE may select one of the two SIBs 19 before the failure of the old first ephemeris information to obtain the second ephemeris information.

In some embodiments, after the UE acquires the second satellite ephemeris information, a time point may be selected after a reference time corresponding to the second satellite ephemeris information, and a random access procedure is initiated, and uplink data transmission is suspended in the random access procedure; and after the random access process is successful, recovering the uplink data transmission.

Optionally, the UE determines the uplink transmission time N using the second satellite ephemeris information from the time of initiating the random access procedure _TA 。

For a better understanding of the embodiments of the present application, referring to fig. 7, fig. 7 is a timing diagram of a random access procedure provided in the embodiments of the present application.

As shown in fig. 7, after acquiring the second satellite ephemeris information from SIB19, the UE may choose to send a suspension indication to the network device at time T2 and send a random access preamble (preamble) to the network device at time T2'.

Wherein T2 may be the reference time of the second satellite ephemeris information or be located after the reference time of the second satellite ephemeris information.

Optionally, the suspension indication may be used to instruct the network device UE to suspend the suspension start time point and/or the suspension end time point of the uplink data transmission.

Alternatively, the suspension start time point may be a radio frame number+a subframe number, or a slot number.

Alternatively, the suspension indication may be implemented by using a random access indication.

Optionally, the UE may start suspending uplink data transmission from the time T2 or the time T2', and resume uplink data transmission after the random access procedure is successful at the time T3.

In some embodiments, if the UE pauses the uplink data transmission from time T2, the network device UE is instructed to start pausing the uplink data transmission at time T2 in a pause indication; if the UE pauses the uplink data transmission from the time T2', the pause instruction indicates that the network device UE starts to pause the uplink data transmission at the time T2'.

In some embodiments, the above-described pause indication may also be used to: the network equipment UE is instructed to start suspending the uplink control information transmission at the time T2 or the time T2'.

In some embodiments, the above-described pause indication may also be used to: and indicating the network equipment to start suspending downlink data transmission and/or downlink control information transmission at the time T2 or the time T2'.

In some embodiments, the UE may notify the network device that "i want to make random access", and then trigger the random access procedure after waiting for the network device to initiate a physical downlink control channel (Physical Downlink Control Channel, PDCCH) command (order).

Referring to fig. 8, fig. 8 is a timing diagram of a random access procedure according to an embodiment of the present application.

As shown in fig. 8, the UE suspends uplink data transmission from the time T2 when the random access request is sent; or starting to suspend uplink data transmission from the time of T2' of receiving PDCCH order; or suspending uplink data transmission from the time of T2' of sending random access preamble (preamble). And after the random access process is successful until the time T3, the uplink data transmission is recovered.

Alternatively, the suspension indication sent by the UE in fig. 7 and the random access request sent by the UE in fig. 8 may be notified by a Media Access Control (MAC) Control Element (CE).

In some embodiments, before suspending the uplink data transmission, if the first satellite almanac information fails, suspending the uplink data transmission when the first satellite almanac information fails.

According to the data transmission method provided by the embodiment of the application, after the UE acquires the new satellite ephemeris information through the SIB19, the uplink data transmission is suspended in a time period of updating the satellite ephemeris information, and the uplink data transmission is restarted after the random access is successful, so that the invalid transmission of air interface resources can be effectively avoided, the utilization rate of the air interface resources is improved, and in an uplink coverage enhancement scene, the improvement effect is more obvious.

Based on the description of the above embodiments, in some embodiments, the UE may also acquire the satellite ephemeris information in the above manner two, that is, the UE may acquire the new second satellite ephemeris information through a dedicated RRC message.

In some embodiments, after the UE acquires the second satellite ephemeris information, the UE may initiate a random access procedure based on the second satellite ephemeris information, and suspend uplink data transmission in the random access procedure; and after the random access process is successful, recovering the uplink data transmission.

In some embodiments, the UE may wait for PDCCH order after acquiring the second satellite ephemeris information, determining the time T2 "at which to initiate random access.

For a better understanding of the embodiments of the present application, referring to fig. 9, fig. 9 is a timing diagram of a random access procedure provided in the embodiments of the present application.

In fig. 9, the UE receives the RRC message sent by the network device at time T2, receives the PDCCH command sent by the network device at time T2', sends the random access preamble to the network device at time T2", and starts to suspend uplink data transmission at any one of time T2, time T2' and time T2", and resumes uplink data transmission after the random access procedure at time T3 is successful.

In some embodiments, the UE may acquire the time T2 "of random access at the same time in the RRC message acquiring the second satellite ephemeris information.

Referring to fig. 10, fig. 10 is a timing diagram of a random access procedure according to an embodiment of the present application.

In fig. 10, the UE receives an RRC message sent by the network device at time T2, where the RRC message includes time T2"; and the UE sends a random access preamble to the network equipment at the moment T2 'and starts to suspend uplink data transmission at the moment T2 or the moment T2', and resumes the uplink data transmission after the random access process is successful at the moment T3.

Optionally, if the RRC message does not have the T2 "time, the uplink transmission is stopped, and at the same time, the UE selects the latest random access time after that, and initiates the random access procedure.

According to the data transmission method provided by the embodiment of the application, after the UE acquires the new satellite calendar information through the RRC message, the uplink data transmission is suspended in the time period of updating the satellite calendar information, and the uplink data transmission is restarted after the random access is successful, so that the phenomenon that the HARQ cache is emptied due to failure of the satellite calendar information can be effectively avoided, the utilization rate of the air interface resource is improved, and in an uplink coverage enhancement scene, the improvement effect is more obvious.

Based on the description in the foregoing embodiments, the embodiments of the present application also provide a data transmission device, which is applied to a user equipment. Referring to fig. 11, fig. 11 is a schematic program module of a data transmission device provided in an embodiment of the present application, where the data transmission device 110 includes:

the obtaining module 1101 is configured to obtain second ephemeris information, where a reference time of the second ephemeris information is located after a reference time of first ephemeris information currently adopted by the UE and before a failure time corresponding to the first ephemeris information.

The first execution module 1102 is configured to initiate a random access procedure according to the second satellite ephemeris information, and suspend uplink data transmission in the random access procedure.

A second execution module 1103 is configured to resume the uplink data transmission after the random access procedure is successful.

In some embodiments, the acquisition module 1101 is to:

acquiring SIB broadcasted by network equipment according to the remaining effective time of the first satellite ephemeris information;

In some embodiments, the first execution module 1102 is to:

In some embodiments, the pause indication is further for:

In some embodiments, the first execution module 1102 is to:

In some embodiments, the acquisition module 1101 is to:

In some embodiments, the first execution module 1102 is to:

In some embodiments, the first execution module 1102 is further to:

According to the data transmission device 110 provided by the embodiment of the application, the uplink data transmission is suspended in the time period when the satellite ephemeris information is updated by the UE, and the uplink data transmission is restarted after the random access is successful, so that the invalid transmission of the air interface resource can be effectively avoided, the utilization rate of the air interface resource is improved, and the improvement effect is more obvious in an uplink coverage enhancement scene.

It should be noted that, in the embodiment of the present application, the content specifically executed by the acquiring module 1101, the first executing module 1102, and the second executing module 1103 is related to each step executed by the UE in the data transmission method described in the foregoing embodiment, and specific reference may be made to the content described in the foregoing embodiment, which is not repeated herein.

Alternatively, the data transmission device 110 may be a chip or a chip module.

The data transmission device 110 described in the above embodiment includes each module, which may be a software module, a hardware module, or a software module and a hardware module. For example, for each device or product applied to or integrated in a chip, each module included in the device or product may be implemented in hardware such as a circuit, or at least some modules may be implemented in software program, where the software program runs on a processor integrated in the chip, and the remaining (if any) some modules may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module contained in the device and product can be realized in a hardware mode such as a circuit, different modules can be located in the same component (such as a chip and a circuit module) of the chip module or in different components, or at least part of the modules can be realized in a software program, the software program runs in a processor integrated in the chip module, and the rest (if any) of the modules can be realized in a hardware mode such as a circuit; for each device or product applied to or integrated in the terminal, the included modules may all be implemented in hardware such as a circuit, and different modules may be located in the same component (e.g. a chip, a circuit module, etc.) or different components in the terminal, or at least some modules may be implemented in a software program, where the software program runs on a processor integrated in the terminal, and the remaining (if any) some modules may be implemented in hardware such as a circuit.

Further, based on the descriptions in the above embodiments, there is also provided a user equipment in the embodiments of the present application, where the user equipment includes at least one processor and a memory; wherein the memory stores computer-executable instructions; the above-mentioned at least one processor executes the computer-executable instructions stored in the memory to implement the steps executed by the ue in the above-mentioned embodiment, which is not described herein again.

Further, based on the descriptions in the above embodiments, there is also provided a network device in the embodiments of the present application, where the network device includes at least one processor and a memory; wherein the memory stores computer-executable instructions; the at least one processor executes the computer-executable instructions stored in the memory to implement the steps executed by the network device in the above embodiment, which is not described herein.

For a better understanding of the embodiments of the present application, referring to fig. 12, fig. 12 is a schematic hardware structure of an electronic device according to the embodiments of the present application. The electronic device may be the user device or the network device.

As shown in fig. 12, the electronic device 120 of the present embodiment includes: a processor 1201 and a memory 1202; wherein:

A memory 1202 for storing computer-executable instructions;

the processor 1201 is configured to execute the computer-executable instructions stored in the memory to implement the steps performed by the user equipment in the foregoing embodiments, and may be specifically referred to as related descriptions in the foregoing method embodiments.

Alternatively, the processor 1201 is configured to execute the computer-executable instructions stored in the memory to implement the steps performed by the network device in the foregoing embodiment, and specifically, reference may be made to the relevant descriptions in the foregoing method embodiments.

Alternatively, the memory 1202 may be separate or integrated with the processor 1201.

When the memory 1202 is provided separately, the device further comprises a bus 1203 for connecting said memory 1202 and the processor 1201.

Further, based on the description in the foregoing embodiment, a computer readable storage medium is further provided in the embodiment of the present application, where computer executable instructions are stored in the computer readable storage medium, and when the processor executes the computer executable instructions, the steps executed by the user equipment side in the foregoing embodiment are implemented.

Further, based on what is described in the foregoing embodiments, there is also provided a computer-readable storage medium in which computer-executable instructions are stored, which when executed by a processor, implement the steps performed by the network device side in the foregoing embodiments.

Further, based on the descriptions in the above embodiments, there is also provided a computer program product in the embodiments of the present application, including a computer program, where the computer program when executed by a processor implements the steps performed by the user equipment side in the above embodiments; or the steps performed by the network device side in the above embodiment.

It should be understood that in several embodiments provided herein, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.

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

In addition, each functional module in each embodiment of the present application may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A data transmission method, characterized in that it is applied in a user equipment UE, the method comprising:

2. The method of claim 1, wherein the obtaining the second satellite ephemeris information comprises:

3. The method according to claim 1 or 2, wherein said initiating a random access procedure based on said second satellite ephemeris information and suspending uplink data transmission during said random access procedure comprises:

4. A method according to claim 3, further comprising:

5. The method of claim 4, wherein the pause indication is further for:

6. The method according to claim 1 or 2, wherein said initiating a random access procedure based on said second satellite ephemeris information and suspending uplink data transmission during said random access procedure comprises:

transmitting a random access request to the network equipment at a first moment, after receiving a Physical Downlink Control Channel (PDCCH) command transmitted by the network equipment at a second moment, transmitting a random access preamble to the network equipment at a third moment, and starting to suspend the uplink data transmission at any one moment of the first moment, the second moment and the third moment;

7. The method of claim 1, wherein the obtaining the second satellite ephemeris information comprises:

and receiving a Radio Resource Control (RRC) message sent by the network equipment, wherein the RRC message comprises the second satellite calendar information.

8. The method of claim 7, wherein the initiating a random access procedure based on the second satellite almanac information and suspending uplink data transmission during the random access procedure comprises:

9. The method of claim 7, wherein the initiating a random access procedure based on the second satellite almanac information and suspending uplink data transmission during the random access procedure comprises:

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

11. The method of claim 1, wherein initiating a random access procedure based on the second satellite ephemeris information comprises:

12. The method of claim 1, wherein suspending uplink data transmission during the random access procedure comprises:

13. A data transmission apparatus, for use in a user equipment UE, the apparatus comprising:

14. The apparatus of claim 13, wherein the acquisition module is configured to:

15. The apparatus of claim 13 or 14, wherein the first execution module is configured to:

16. The apparatus of claim 15, wherein the device comprises a plurality of sensors,

17. The method of claim 16, wherein the pause indication is further for:

18. The apparatus of claim 13 or 14, wherein the first execution module is configured to:

19. The apparatus of claim 13, wherein the acquisition module is configured to:

20. The apparatus of claim 19, wherein the first execution module is to:

21. The apparatus of claim 19, wherein the first execution module is to:

22. The apparatus of claim 21, wherein the first execution module is further to:

23. The apparatus of claim 13, wherein the first execution module is further to:

24. The apparatus of claim 13, wherein the first execution module is further to:

25. A user device, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the data transmission method of any one of claims 1 to 12.

26. A computer-readable storage medium, in which computer-executable instructions are stored which, when executed by a processor, implement the data transmission method of any one of claims 1 to 12.

27. A computer program product comprising a computer program which, when executed by a processor, implements the data transmission method according to any one of claims 1 to 12.