WO2019158096A1 - Method and device for transmitting data during random access - Google Patents

Abstract

The present application provides a method and a device for transmitting data during random access. The method comprises: sending a message 1 to a network device; receiving a message 2 sent by the network device, the message 2 comprising uplink authorization information, the uplink authorization information comprising first indication information, the first indication information being used to indicate an allowed transport block size (TBS) in a message 3; according to the allowed TBS, determining a target TBS from candidate TBSs, the target TBS being less than or equal to the allowed TBS; sending the message 3 to the network device, the message 3 comprising uplink data transmitted according to the target TBS. The present application can improve the efficiency of transmitting uplink data during random access.

Description

Method and device for transmitting data in random access process Technical field

The present application relates to the field of communications and, more particularly, to a method and apparatus for transmitting data in a random access procedure.

Background technique

In the 3rd Generation Partnership Project (3GPP) protocol R13 or R14, the terminal device needs to complete random access first, and establish radio resource control with the network device (specifically, the base station) (Radio Resource Control) After the RRC) link, the uplink data can be transmitted. However, since the random access and the establishment of the RRC link require a long interaction time, the transmission delay of the uplink data is large, and further, since the random access and the signaling of the interaction in the establishment of the RRC link are relatively large, the terminal device The power consumption will also be higher. Especially for the Narrow Band Internet of Things (NB-IoT) terminal device based on cellular, the delay and power consumption are more obvious.

In order to reduce the transmission delay of the service data and the power consumption of the terminal device, the 3GPP protocol R15 specifies that the terminal device can transmit the uplink data to the network device in the random access process. Specifically, the terminal device can carry the uplink data by using the message 3 sent to the network device in the random access process, so as to transmit the uplink data to the network device in the random access process. In the random access process, since the network device does not know exactly the size of the uplink data to be transmitted by the terminal device, the network device can only indicate a maximum transport block size (TBS) through the message 2, so that The terminal device transmits uplink data to the network device according to the maximum TBS. When the size of the transport block (TB) required for the uplink data to be transmitted by the terminal device is much smaller than the TBS indicated by the network device, the terminal device needs to perform a larger proportion at the Media Access Control (MAC) layer. The padding of the packet causes waste of uplink resources and power consumption of the terminal device, resulting in low transmission efficiency of uplink data.

Summary of the invention

The present application provides a method and apparatus for transmitting data in a random access procedure to improve the efficiency of transmitting uplink data in a random access procedure.

A first aspect provides a method for transmitting data in a random access process, the method comprising: sending a message 1 to a network device; receiving a message 2 sent by the network device; determining a target TBS in the candidate TBS according to the allowed TBS ; Send a message 3 to the network device. The message 2 includes uplink grant information, and the uplink grant information (UL grant) further includes first indication information, where the first indication information is used to indicate a transport block size (TBS) allowed in the message 3. The above target TBS is less than or equal to the allowed TBS. The above message 3 contains uplink data transmitted in accordance with the target TBS.

Further, the foregoing first indication information may further specifically indicate a maximum TBS allowed in the message 3. In this case, the target TBS is less than or equal to the maximum TBS allowed in the message 3. Assuming that the maximum TBS allowed in message 3 is the first TBS, then the target TBS can only be selected among the options in the candidate TBS that are less than or equal to the first TBS.

The above candidate TBS is all available TBSs when message 3 can be sent.

Optionally, the message 1 is a preamble (Preamble) sent to the network device.

It should be understood that when the foregoing method is performed by the terminal device or the executing device therein, the above messages 1 to 3 are messages that are exchanged with the terminal device during the random access of the terminal device to the network device.

The foregoing message 1 may specifically be a preamble sequence for initiating random access. Further, the message 1 can be used to obtain the uplink timing, and the resource location of the sending preamble sequence can be used to implicitly notify the network device of the specific information, such as the coverage information of the terminal device, the data volume information of the message 3, and the transmission mode information of the message 3. (single subcarrier or multiple subcarriers) and so on.

The message 2 is used to respond to the message 1. The message 2 includes the timing adjustment information and the first indication information of the message 3. The timing adjustment information is used to guide the terminal device to complete the uplink synchronization, and the first indication information is used to indicate the resource location of the message 3 transmission. .

The message 3 is used to carry the uplink data sent to the network device, and the TBS allowed to be used by the uplink data is indicated by the first indication information in the message 2.

The present application can freely select a target TBS from the candidate TBS according to the allowed TBS, and the selected target TBS is less than or equal to the allowed TBS. Therefore, the present application can allow the terminal device to independently select a suitable TBS without having to completely use the network device. The indicated allowed TBS improves the flexibility of the terminal device to determine the TBS, thereby improving the transmission efficiency of the uplink data in the random access process.

In a possible implementation, determining the target TBS in the candidate TBS according to the allowed TBS, specifically: determining, according to the allowed TBS, determining at least one TBS in the candidate TBS; according to the size of the uplink data, from at least A target TBS that can be used to transmit uplink data is determined in one TBS.

In the present application, in combination with the allowed TBS and the size of the uplink data, the TBS matching the uplink data size can be selected as the target TBS, which can further reduce the proportion of packet filling when transmitting the uplink data, and improve the transmission efficiency of the uplink data.

Wherein each TBS of the at least one TBS is less than or equal to the allowed TBS.

Optionally, the at least one TBS is a TBS in the candidate TBS.

Determining at least one TBS from the candidate TBS may also be understood as determining a first TBS set according to the candidate TBS, where the first TBS set is composed of the at least one TBS.

The at least one TBS is determined in the candidate TBS according to the allowed TBS, and may specifically include the following methods:

The first mode is: determining, by using a TBS that is less than or equal to the allowed TBS in the candidate TBS, a preset number of TBSs as the at least one TBS.

For example, the candidate TBS includes TBS1, TBS2, TBS3, TBS4, TBS5, and TBS6, where TBS1 to TBS6 are 144bit, 328bit, 504bit, 680bit, 872bit, and 1000bit, respectively, and the maximum TBS allowed is 1000bit, and the TBS in the candidate TBS is If it is less than 1000 bits, then 4 TBSs (preset number of 4) may be selected as the at least one TBS in the candidate TBS.

In the above example, when four TBSs are selected from the candidate TBSs, the largest four TBSs (TBS3, TBS4, TBS5, and TBS6) may be selected as the at least one TBS from the candidate TBSs in descending order; The smallest 4 TBSs (TBS1, TBS2, TBS3, and TBS4) may be selected from the candidate TBSs as the at least one TBS in order from small to large; the largest two TBSs (TBS5 and TBS6) may also be selected from the candidate TBSs. And the smallest two TBSs (TBS1 and TBS2) as the at least one TBS described above.

The second mode: determining, from the TBS in the candidate TBS that is less than or equal to the allowed TBS, a TBS greater than a preset value as the at least one TBS.

For example, the candidate TBS includes TBS1 to TBS6, where TBS1 to TBS6 are 144bit, 328bit, 504bit, 680bit, 872bit, and 1000bit, respectively, and the maximum TBS allowed is 1000bit, and the TBS in the candidate TBS is less than 1000bit, and the candidate TBS is greater than A TBS (TBS4, TBS5, and TBS6) of 504 (preset value) is used as the at least one TBS.

The third mode: first, a TBS that is greater than a preset value is determined from the TBS that is less than or equal to the allowed TBS, and then selects a preset number of TBSs from the TBS that is greater than the preset value as the at least one TBS. .

For example, the candidate TBS includes TBS1 to TBS6, where TBS1 to TBS6 are 144bit, 328bit, 504bit, 680bit, 872bit, and 1000bit, respectively, and the maximum TBS allowed is 1000bit, and the TBS in the candidate TBS is less than 1000bit, and the candidate TBS is greater than A TBS (TBS4, TBS5, and TBS6) of 504 (preset value) is used as a TBS greater than a preset value, and then two TBSs (TBS5 and TBS6) are selected as the at least one TBS from the TBSs larger than the preset value.

In addition, the foregoing determining, from the at least one TBS, the target TBS that can be used for transmitting the uplink data, specifically, determining the size of the TB that is greater than or equal to the size of the TB corresponding to the uplink data and corresponding to the uplink data from the at least one TBS. The difference between the TBS within a certain preset range is taken as the target TBS.

For example, at least one TBS includes TBS1, TBS2, and TBS3, where TBS1 is 504bit, TBS2 is 680bit, TBS3 is 872bit, and TB of uplink data is 650bit. In TBS1, TBS2, and TBS3, TBS2 and TBS3 are greater than The difference between the size of the TB corresponding to the TBS2 and the uplink data is 30 bits, and the difference between the size of the TB corresponding to the uplink data and the TB is 222 bits, and the size of the TB corresponding to the uplink data and the preset range of the difference of the TBS are assumed. If the difference between the TBS2 and the TBS3 and the uplink data is less than or equal to 250 bits, the difference between the TBS2 and the TBS3 is within the preset range of the difference. Then, one TBS can be arbitrarily selected from the TBS2 and the TBS3 as the target TBS.

Alternatively, a TBS that is greater than or equal to the size of the TB corresponding to the uplink data and has the smallest difference in the size of the TB corresponding to the uplink data may be determined from the at least one TBS as the target TBS.

For example, at least one TBS includes TBS1, TBS2, and TBS3, where TBS1 is 504bit, TBS2 is 680bit, TBS3 is 872bit, and TB of uplink data is 650bit. In TBS1, TBS2, and TBS3, TBS2 and TBS3 are greater than The difference between the size of the TB corresponding to the TBS2 and the uplink data is 30 bits, and the difference between the size of the TB corresponding to the uplink data and the TB is 222 bits, and the difference between the size of the TB corresponding to the TBS2 and the uplink data is smaller. Select TBS2 as the target TBS.

In a possible implementation manner, before determining the target TBS in the candidate TBS according to the allowed TBS, the method further includes: determining whether the preset condition is met; and if the preset condition is met, according to the allowed The TBS determines the target TBS in the candidate TBS.

In the present application, the target TBS can be determined from the candidate TBS according to the allowed TBS in a specific case (the preset condition is satisfied), so that the terminal device can flexibly determine the selection mode of the selected target TBS according to actual conditions.

Further, in a case where the preset condition is not satisfied, the (terminal device) transmits the message 3 to the network device according to the allowed TBS and the resource location indicated by the first indication information in the message 2.

Optionally, the foregoing preset condition is that the coverage level of the terminal device meets a preset condition.

In a possible implementation, the coverage level of the terminal device meets the preset condition, including at least one of the following situations: the coverage level corresponding to the message 1 sent by the terminal device to the network device is lower than the coverage level threshold; the terminal device is connected to the network. The coverage level corresponding to the message 1 sent by the device is higher than the coverage level threshold; the coverage level corresponding to the message 1 sent by the terminal device to the network device is equal to the coverage level threshold.

The coverage level threshold may be an appointment value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the coverage level threshold.

In a possible implementation, the coverage level of the terminal device meets the preset condition, including at least one of the following situations: the coverage level corresponding to the message 1 sent by the terminal device to the network device belongs to the coverage level set indicated by the base station; the terminal device The coverage level corresponding to the message 1 sent to the network device does not belong to the coverage level set indicated by the base station.

The foregoing set of coverage levels may be a set of appointments, or the network device may notify the terminal device by using indication information, where the indication information is used to indicate the coverage level set.

In a possible implementation manner, the terminal device determines, according to the measurement result of the current measurement quantity and the threshold value of the measurement quantity configured by the network device, a coverage level corresponding to the message 1 sent by the terminal device to the network device.

In a possible implementation manner, satisfying the preset condition includes at least one of: allowing the adopted TBS to be greater than the TBS threshold; allowing the adopted TBS to be smaller than the TBS threshold; allowing the adopted TBS to be equal to the TBS threshold.

The foregoing TBS threshold may be an agreed value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the TBS threshold.

In a possible implementation, the message 1 is carried on the first resource, where the message 1 is carried on the first resource to indicate that the uplink data is sent to the network device by using the message 3.

In this application, whether the message 1 is carried on a specific resource can flexibly indicate whether the uplink data is transmitted during the random access process, so that the network device can receive the uplink data.

Specifically, when the message 1 is carried on a specific resource, the network device performs uplink data reception in the random access process, and when the message 1 is carried on other resources than the specific resource, the network device completes the random access. After that (specifically, after the RRC link is established), the uplink data can be received.

It should be understood that, in the present application, it is also possible to not limit whether the message 1 is carried on a specific resource, that is, whether the message 1 is sent on any resource, the uplink data may be transmitted to the network device in the random access process. .

Specifically, when the foregoing method is performed by the terminal device, if the terminal device sends the message 1 on the first resource, the terminal device sends the uplink data to the network device in the random access procedure; if the terminal device is the first resource The other resources send message 1, then the terminal device will send the uplink data to the network device after completing the random access and establishing an RRC link with the network device.

In a possible implementation, the method further includes: receiving, by the network device, second indication information, where the second indication information is used to indicate resending the message 3 and the updated TBS used when resending the message 3; In the case where the updated TBS and the target TBS are identical, the message 3 is resent to the network device. The retransmitted message 3 includes the uplink data transmitted according to the target TBS.

In the present application, by repeating the transmission of the message 3 by the instruction of the second indication information, the reliability of the uplink data transmission can be improved.

It should be understood that when the network device does not correctly decode the message 3, the network device may indicate that the transmission of the message 3 is re-transmitted by transmitting the second indication information, thereby enabling the network device to resolve the uplink data in the message 3.

In addition, the network device may use the parsed target TBS as the updated TBS used when resending the message 3 in the process of decoding the message 3. If the updated TBS is the same as the target TBS, then the network device is decoding the message 3. The process correctly resolves to the target TBS. Next, the terminal device directly sends the message 3 to the network device again. However, if the updated TBS is different from the target TBS, it is likely that the network device is in the process of decoding the message 3. The target TBS is not correctly resolved. Therefore, even if the terminal device resends the message 3 to the network device again, the network device cannot parse the uplink data in the message 3 according to the target TBS. In this case, the terminal device can re-execute the random connection. Incoming to send uplink data.

In a possible implementation, the method further includes: receiving, by the network device, second indication information, where the second indication information is used to indicate resending the message 3 and the updated TBS used when resending the message 3; If the updated TBS and the target TBS are inconsistent, the message 1 is sent to the network device again to re-execute the random access, where the message 1 is carried on the second resource, and is used to indicate to the network after completing the re-execution of the random access. The device sends uplink data, and the second resource is different from the first resource.

In the present application, when the uplink data cannot be sent in the random access process, the random access can be re-executed by sending the message 1 again, and the uplink data is transmitted after the random access is completed, thereby improving the uplink data. The reliability of the transmission.

In a possible implementation, the method further includes: receiving, by the network device, second indication information, where the second indication information is used to indicate resending the message 3 and the updated TBS used when resending the message 3; If the updated TBS and the target TBS are inconsistent, the message 1 is sent to the network device again to re-execute the random access, where the message 1 is carried on the first resource, and is used to indicate to the network when the random access procedure is re-executed. The device sends upstream data.

In this application, when the uplink data cannot be sent in the random access process, the random access can be re-executed by sending the message 1 again, and the uplink data is transmitted again during the random access process, thereby improving the uplink data. The reliability of the transmission.

In the present application, when the uplink data cannot be sent in the random access process, the random access may be re-executed and the uplink data may be sent in the random access process, or the random access may be re-executed, and the random access is completed. After the access, the uplink data is transmitted.

In a possible implementation manner, the manner in which the message 3 is sent is used to indicate the target TBS.

In the present application, the target TBS is indicated by the sending manner of the message 3, so that the network device can decode the message 3 according to the target TBS, which simplifies the decoding process.

Alternatively, the DMRS sequence used to send message 3 can be used to indicate the target TBS.

In the present application, the network device can determine the target TBS by determining which DMRS sequence is used to send the message 3, so as to facilitate accurate decoding according to the target TBS.

Specifically, the DMRS sequence has a one-to-one correspondence or a many-to-one relationship with the TBS, and one TBS can correspond to at least one DMRS sequence. When the message 3 is sent by using a certain DMRS sequence, the TBS corresponding to the DMRS sequence is the target TBS.

For example, the TBSs corresponding to the DMRS1, DMRS2, and DMRS3 sequences are TBS1, TBS2, and TBS3, respectively. Then, when the message 3 is transmitted using the DMRS2 sequence, the TBS2 is the target TBS.

Optionally, the offset of the start time domain position of the physical uplink shared channel of the message 3 relative to the resource allocated by the network device in the time domain is used to indicate the target TBS.

The above starting time domain position may specifically be the starting symbol position.

In the present application, the network device can determine the target TBS by transmitting the offset of the starting time domain location of the physical uplink shared channel of the message 3 with respect to the resource allocated by the network device in the time domain, so as to facilitate accurate decoding according to the target TBS.

Specifically, the start time domain position of the physical uplink shared channel that sends the message 3 has a one-to-one correspondence or a many-to-one relationship with the TBS in the time domain relative to the resource allocated by the network device, and one TBS may correspond to at least one The offset value, when the sending message 3 corresponds to a certain offset value, the TBS corresponding to the offset value is the target TBS.

For example, the offset value of the start time domain position of the physical uplink shared channel for transmitting the message 3 relative to the resource allocated by the network device in the time domain includes offset1, offset2, offset3, and offset4, and the TBS corresponding to the offset values are respectively TBS1, TBS2, TBS3, and TBS4, then, when the initial time domain location of the physical uplink shared channel for transmitting message 3 is offset2 in the time domain relative to the resource allocated by the network device, TBS2 is the target TBS.

A second aspect provides a method for transmitting data in a random access process, the method comprising: receiving a message 1 sent by a terminal device; sending a message 2 to the terminal device in response to the message 1, the message 2 includes uplink authorization information, where The uplink authorization information includes first indication information, where the first indication information is used to indicate the transport block size TBS allowed in the message 3; the message 3 sent by the terminal device is received; the network device determines the target TBS according to the sending manner of the message 3; 3 for decoding.

The method in the second aspect of the present application corresponds to the method in the first aspect, wherein the method in the first aspect can be performed by a terminal device, and the method in the second aspect can be performed by a network device.

The present application can determine the target TBS according to the manner of sending the message 3, and can further decode the message 3 according to the target TBS, thereby improving the decoding efficiency of the uplink data.

In a possible implementation manner, the manner in which the message 3 is sent is used to indicate the target TBS.

Optionally, the DMRS sequence used to send the message 3 may be used to indicate the target TBS;

In the present application, the network device can determine the target TBS by determining which DMRS sequence is used to transmit the message 3, so as to facilitate accurate decoding according to the target TBS.

Specifically, the DMRS sequence has a one-to-one correspondence or a many-to-one relationship with the TBS, and one TBS can correspond to at least one DMRS sequence. When the message 3 is sent by using a certain DMRS sequence, the TBS corresponding to the DMRS sequence is the target TBS.

For example, the TBSs corresponding to the DMRS1, DMRS2, and DMRS3 sequences are TBS1, TBS2, and TBS3, respectively. Then, when the message 3 is transmitted using the DMRS2 sequence, the TBS2 is the target TBS.

Optionally, the initial time domain location of the physical uplink shared channel that sends the message 3 is offset from the resource allocated by the network device in the time domain.

Specifically, the above starting time domain position may be a starting symbol position.

In the present application, the network device can determine the target TBS by transmitting the offset of the starting time domain location of the physical uplink shared channel of the message 3 with respect to the resource allocated by the network device in the time domain, so as to facilitate accurate decoding according to the target TBS.

Specifically, the start time domain position of the physical uplink shared channel that sends the message 3 has a one-to-one correspondence or a many-to-one relationship with the TBS in the time domain relative to the resource allocated by the network device, and one TBS may correspond to at least one The offset value, when the sending message 3 corresponds to a certain offset value, the TBS corresponding to the offset value is the target TBS.

For example, the offset value of the start time domain position of the physical uplink shared channel for transmitting the message 3 relative to the resource allocated by the network device in the time domain includes offset1, offset2, offset3, and offset4, and the TBS corresponding to the offset values are respectively TBS1, TBS2, TBS3, and TBS4, then, when the initial time domain location of the physical uplink shared channel for transmitting message 3 is offset2 in the time domain relative to the resource allocated by the network device, TBS2 is the target TBS.

In a third aspect, an apparatus for transmitting data in a final random access procedure is provided, the apparatus comprising means for performing the method of the first aspect or various implementations thereof.

In a fourth aspect, an apparatus for transmitting data in a random access procedure is provided, the apparatus comprising means for performing the method of the second aspect or various implementations thereof.

A fifth aspect provides an apparatus for transmitting data in a random access process, the apparatus comprising: a memory for storing a program; a processor and a transceiver, wherein the processor is configured to execute the program stored by the memory, The processor and the transceiver are operative to perform the method of the first aspect or various implementations thereof when the program is executed. The processor controls the transceiver to perform the signal transceiving when a signal is required to be transceived.

A sixth aspect provides an apparatus for transmitting data in a random access process, the apparatus comprising: a memory for storing a program; a processor and a transceiver, wherein the processor is configured to execute the program stored by the memory, The processor and the transceiver are operative to perform the method of the second aspect or various implementations thereof when the program is executed. The processor controls the transceiver to perform the signal transceiving when a signal is required to be transceived.

Alternatively, the devices in the above third and fifth aspects may be terminal devices.

Alternatively, the devices in the above fourth and sixth aspects may be network devices.

In a seventh aspect, a computer readable medium storing program code for device execution, the program code comprising instructions for performing the method of the first aspect or various implementations thereof.

In an eighth aspect, a computer readable medium storing program code for device execution, the program code comprising instructions for performing the method of the second aspect or various implementations thereof.

In a ninth aspect, a computer program code is provided, the program code comprising instructions for performing the method of the first aspect or various implementations thereof.

In a tenth aspect, a computer program code is provided, the program code comprising instructions for performing the method of the second aspect or various implementations thereof.

DRAWINGS

1 is a schematic structural diagram of a communication system to which an embodiment of the present application is applied;

2 is a schematic flowchart of a method for transmitting data in a random access process according to an embodiment of the present application;

Figure 3 is a schematic structural diagram of Message 2;

4 is a schematic structural diagram of a random access response;

FIG. 5 is a flowchart of a method for transmitting data in a random access procedure according to an embodiment of the present application; FIG.

6 is a flowchart of a method for transmitting data in a random access procedure according to an embodiment of the present application;

7 is a schematic diagram of a method for transmitting data in a random access procedure according to an embodiment of the present application;

FIG. 8 is a schematic block diagram of an apparatus for transmitting data in a random access procedure according to an embodiment of the present application; FIG.

FIG. 9 is a schematic block diagram of an apparatus for transmitting data in a random access procedure according to an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a wideband code division multiple access. (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, and the future fifth generation (5th Generation, 5G) system or new radio (New Radio, NR) and so on.

The terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or in the future evolution of the Public Land Mobile Network (PLMN) The terminal device and the like are not limited in this embodiment of the present application.

The network device in the embodiment of the present application may be a device for communicating with the terminal device, and the network device may also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device may be The embodiment of the present application is not limited to a relay station, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network.

FIG. 1 is a schematic structural diagram of a communication system to which an embodiment of the present application is applied.

The communication system shown in FIG. 1 includes a network device and a terminal device. In the communication system shown in FIG. 1, the terminal device can access the mobile communication network by means of random access, and the terminal device can also be randomly connected. The uplink data can be sent to the network device during the incoming process. It should be understood that only one network device and one terminal device are shown in FIG. 1. In fact, the communication system applied in the embodiment of the present application may be a system including multiple network devices and multiple terminal devices, and FIG. 1 The network device in the network device may specifically include an access network device, a core network device, and the like.

Specifically, the network device shown in FIG. 1 may be an access device in which the terminal device accesses the communication system in a wireless manner, and may be a base station (NodeB), an evolved base station (eNodeB), or a base station in a 5G communication system. The specific technology and the specific device configuration adopted by the network device are not limited in the embodiment of the present application, such as a base station in a future communication system or an access node in a wireless fidelity (WiFi) system.

It should be understood that FIG. 1 is only a schematic diagram of a communication system that may be applied to the embodiments of the present application. The embodiments of the present application may also be applied to other communication systems that can implement communication between a network device and a terminal device. The specific form of the applied communication system is not limited.

Further, the embodiment of the present application can also be specifically applied to a communication system in a Narrow Band Internet of Things (NB-IoT), and an enhanced machine type communication (eMTC) system.

FIG. 2 is a schematic flowchart of a method for transmitting data in a random access procedure according to an embodiment of the present application. The method shown in FIG. 2 can be performed by the terminal device. The method shown in FIG. 2 specifically includes steps 101 to 104, and the steps 101 to 104 are respectively described in detail below.

101. Send a message 1 to the network device.

Message 1 may also be referred to as a Msg1 (Message 1) message, and message 1 may specifically be a preamble (Preamble).

When transmitting the preamble sequence, the terminal device may randomly select resources to send the preamble sequence. If multiple terminal devices send the same preamble sequence on the same resource, a collision may occur; if multiple terminals send different on the same resource. Before the sequence, and these sequences are orthogonal, then no collision will occur.

102. Receive a message 2 sent by the network device.

The above message 2 includes uplink grant information (UL grant), which in turn includes first indication information, which is used for the TBS allowed in the message 3.

Optionally, the foregoing first indication information may further specifically indicate a maximum TBS allowed in the message 3. For example, the first indication information may indicate that the maximum TBS allowed in the message 3 is 1000 bits, and the maximum allowed TBS in the message 3 cannot exceed 1000 bits.

After detecting the preamble sequence on a certain time-frequency resource, the network device carries the preamble sequence in message 2 (Msg2), indicating that the network device detects the preamble sequence, and the network device also carries random access in message 2. Response (RAR). How many RARs (random access responses) the network device carries in the message 2, how many preamble sequences are detected on the time-frequency resource.

Exemplarily, the structure of the message 2 will be described below with reference to FIG. 3. As shown in FIG. 3, the message 2 includes a MAC frame header and a random access response, and in addition, the message 2 may further include padding. The MAC header includes a number of MAC subheaders, and the MAC header includes a backoff identifier and a random access preamble identifier.

When the network device detects n (n is an integer greater than or equal to 1) preamble sequence, the MAC frame header in message 2 includes n Random Access Preamble Identifiers (RAPIDs), message 2 The random access response in the middle includes n random access responses (MAC RAR1, MAC RAR2...MAC RARn).

Exemplarily, the specific structure of the random access response is as shown in FIG. 4, and the random access response specifically includes: timing advanced command, uplink grant (UL Grant), and cell radio network temporary identifier (Cell Radio) Network Temporary Identifier (C-RNTI) and Reserved bits.

Optionally, as an embodiment, the message 2 includes uplink grant information (UL grant), and the uplink grant information includes first indication information, where the first indication information and the TBS threshold jointly indicate that the TBS is allowed to be adopted. The allowed TBS can be greater than or equal to or less than the TBS threshold. For example, the TBS threshold is equal to 424 bits, and the TBS allowed to be employed may be determined to be 504 bits or 424 bits or 408 bits according to the first indication information and the TBS threshold.

Alternatively, the first indication information and the TBS threshold jointly indicate that the maximum TBS allowed by the message 3 is adopted. The maximum allowed TBS may be greater than or equal to or less than the TBS threshold. For example, the TBS threshold is equal to 776 bits, and the maximum allowed TBS allowed to be employed according to the first indication information and the TBS threshold may be 808 bits or 776 bits or 712 bits.

The foregoing TBS threshold may be a preset agreement value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the TBS threshold.

Optionally, in another embodiment, the message 2 includes uplink grant information (UL grant), and the uplink grant information may further include third indication information, where the third indication information indicates the number of resource units of the message 3. Or the third indication information and the TBS threshold jointly indicate the number of resource units of the message 3. For example, when the TBS threshold is 776 bits and the third indication information is '100', the number of resource units is indicated as 5.

The TBS allowed by Msg3 is determined according to the number of resource units. The allowed TBS can be greater than or equal to or less than the TBS threshold.

For example, in Table 1, it may be determined whether the TBS threshold of the column is included in the TBS set of the column according to the column of the number of resource units, and if the TBS threshold is included, the allowed TBS is equal to the TBS threshold. For example, the number of resource units is 5, the index of a resource unit corresponding to I _RU is equal to 4, it is determined that the number of resource unit is located TBS 120,176,208,256,328,424,504,584,680,776,872,1000 column set is {}. The TBS threshold includes 776 bits in the TBS set, so it is determined that the allowed TBS is 776 bits. If the TBS threshold is not included in the TBS set, the TBS in the TBS set that is closest to the TBS threshold and greater or smaller than the TBS threshold is determined as the allowed TBS. For example, the TBS threshold is 872 bits, the number of resource units is 6, and the determined TBS set is {152, 208, 256, 328, 408, 504, 600, 712, 808, 936, 1000}. The TBS threshold 872 bits are not included in the TBS set, and the TBS in the TBS set that is closest to the TBS threshold 872 bits and larger than the TBS threshold is determined as the allowed TBS, that is, the determination 936 is the allowed TBS. Or determining the TBS in the TBS set that is closest to the TBS threshold 872 bits and smaller than the TBS threshold as the allowed TBS, ie, determining 808 as the allowed TBS.

Alternatively, the maximum allowed TBS may be determined according to the number of resource units. Similarly, in Table 1, it may be determined whether the TBS threshold is included in the TBS set of the column according to the column of the number of resource units, and if the TBS threshold is included, the maximum allowed TBS is the TBS threshold. If the TBS threshold is not included in the TBS set, the TBS in the TBS set that is closest to the TBS threshold and greater or smaller than the TBS threshold is determined as the maximum TBS allowed to be employed.

For example, the TBS threshold is 872 bits, the number of resource units is 6, and the determined TBS set is {152, 208, 256, 328, 408, 504, 600, 712, 808, 936, 1000}. The TBS threshold 872 bits are not included in the TBS set, and the TBS in the TBS set that is closest to the TBS threshold 872 bits and greater than the TBS threshold is determined as the maximum allowed TBS, ie, the determination 936 is the maximum allowed TBS. Or determining the TBS in the TBS set that is closest to the TBS threshold 872 bits and smaller than the TBS threshold as the allowed TBS, ie, determining 808 as the allowed TBS.

The foregoing TBS threshold may be a preset agreement value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the TBS threshold.

Specifically, when the TBS threshold is 1000, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum allowed TBS is as shown in Table 2. For example, if the UL Grant is 011 and the TBS threshold is 1000, the maximum allowed TBS is 1000, and the number of resource units (RU: resource unit) is 4.

Table 2 TBS threshold is 1000

UL Grant	Maximum allowed TBS, number of resource units
‘011’	1000bits, 4RUs
‘100’	1000bits, 5RUs
‘101’	1000bits, 6RUs
‘110’	1000bits, 8RUs

‘111’

1000bits, 10RUs

Specifically, when the TBS threshold is 872, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum TBS allowed to be used is shown in Table 3.

Table 3 TBS threshold is 872

UL Grant	Maximum allowed TBS, number of resource units
‘011’	1000bits, 4RUs
‘100’	872bits, 5RUs
‘101’	936bits, 6RUs
‘110’	1000bits, 8RUs
‘111’	872bits, 10RUs

Specifically, when the TBS threshold is 776, the third indication information in the UL Grant is '011', '100', '101', '110', '111', and is determined under different resource unit numbers. The maximum TBS allowed to be used is shown in Table 4.

Table 4 TBS threshold is 776

UL Grant	Maximum allowed TBS, number of resource units
‘011’	776bits, 4RUs
‘100’	776bits, 5RUs
‘101’	808bits, 6RUs
‘110’	808bits, 8RUs
‘111’	872bits, 10RUs

Specifically, when the TBS threshold is 680, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum TBS allowed to be used is shown in Table 5.

Table 5 TBS threshold is 680

UL Grant	Maximum allowed TBS, number of resource units
‘011’	680bits, 3RUs
‘100’	680bits, 4RUs
‘101’	680bits, 5RUs
‘110’	680bits, 6RUs
‘111’	680bits, 10RUs

Specifically, when the TBS threshold is 504, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum TBS allowed to be used is shown in Table 6.

Table 6 TBS threshold is 504

UL Grant	Maximum allowed TBS, number of resource units
‘011’	504bits, 3RUs
‘100’	536bits, 4RUs
‘101’	504bits, 5RUs
‘110’	504bits, 6RUs
‘111’	552bits, 8RUs

Specifically, when the TBS threshold is 424, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum TBS allowed to be used is shown in Table 7.

Table 7 TBS threshold is 424

UL Grant	Maximum allowed TBS, number of resource units
‘011’	440bits, 2RUs
‘100’	456bits, 3RUs
‘101’	472bits, 4RUs
‘110’	424bits, 5RUs
‘111’	504bits, 6RUs

Specifically, when the TBS threshold is 328, the third indication information in the UL Grant is '011', '100', '101', '110', '111', and is determined under different resource unit numbers. The maximum TBS allowed to be used is shown in Table 8.

Table 8 TBS threshold is 328

UL Grant	Maximum allowed TBS, number of resource units
‘011’	328bits, 2RUs
‘100’	328bits, 3RUs
‘101’	328bits, 4RUs
‘110’	328bits, 5RUs
‘111’	328bits, 6RUs

Specifically, when the TBS threshold is 256, when the third indication information in the UL Grant is '011', '100', '101', '110', '111', the number of different resource units is determined. The maximum TBS allowed to be used is shown in Table 9.

Table 9 TBS threshold is 256

UL Grant	Maximum allowed TBS, number of resource units
‘011’	256bits, 2RUs
‘100’	256bits, 3RUs
‘101’	256bits, 4RUs
‘110’	256bits, 5RUs
‘111’	256bits, 6RUs

It should be understood that the numerical values in Tables 2 to 9 are merely examples. In addition, the correspondence between the UL grant in the table and the maximum allowed TBS and the number of resource units allowed in the present invention is not limited in the present invention. For example, it should be understood that Table 2 may also be 011 corresponding to 1000 bits, 6 RUs.

It should be understood that in Tables 2 to 9, the maximum TBS allowed to be used may also be replaced with a TBS that is allowed to be employed. At the same time, the maximum TBS allowed to be used may also be smaller than the TBS threshold. In Tables 2 to 9, only the case where the TBS threshold is greater than or equal to is listed.

Optionally, in another embodiment, the message 2 includes uplink grant information (UL grant), and the uplink grant information may further include fourth indication information, where the fourth indication information indicates a TBS index of the message 3. Or the fourth indication information and the TBS threshold jointly indicate the TBS index of the message 3. For example, when the TBS threshold is 776 bits and the third indication information is '100', the TBS index I _TBS is indicated to be 5.

_TBS The TBS index to determine the I Msg3 allowed TBS employed. The allowed TBS can be greater than or equal to or less than the TBS threshold.

For example, in Table 1, it may be determined whether the TBS threshold of the row is included in the TBS set of the row according to the row where the TBS index I _TBS is located, and if the TBS threshold is included, the allowed TBS is equal to the TBS threshold. For example, the TBS index I _TBS is 9, and the TBS set of the row in which the TBS index I _TBS is located is determined to be {136, 296, 456, 616, 776, 936}. The TBS threshold includes 776 bits in the TBS set, so it is determined that the allowed TBS is 776 bits. If the TBS threshold is not included in the TBS set, the TBS in the TBS set that is closest to the TBS threshold and greater or smaller than the TBS threshold is determined as the allowed TBS. For example, if the TBS threshold is 872 bits, the TBS in the TBS set that is closest to the TBS threshold 872 bits and greater than the TBS threshold is determined as the allowed TBS, ie, the determination 936 is the allowed TBS. Or the TBS in the TBS set that is closest to the TBS threshold 872 bits and smaller than the TBS threshold is determined as the allowed TBS, ie, the determination 776 is the allowed TBS.

Alternatively, it may also be determined using the Msg3 allowed maximum TBS TBS index according to I _TBS. Similarly, in Table 1, according to the row in which the TBS index I _TBS is located, it is determined whether the TBS threshold is included in the TBS set of the row, and if the TBS threshold is included, the maximum TBS allowed is the TBS threshold. If the TBS threshold is not included in the TBS set, the TBS in the TBS set that is closest to the TBS threshold and greater or smaller than the TBS threshold is determined as the maximum TBS allowed to be employed.

The foregoing TBS threshold may be a preset agreement value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the TBS threshold.

103. Determine a target TBS in the candidate TBS according to the allowed TBS.

When the target TBS is determined in the candidate TBS according to the allowed TBS, the determined target TBS may be made less than or equal to the allowed TBS. Among them, the candidate TBSs may exist in the form of a list. The terminal device may determine the target TBS from the candidate TBSs according to the lookup table.

The above candidate TBS is all available TBSs when message 3 can be sent.

For example, if the maximum TBS allowed is 1000 bits, then the target TBS finally selected from the candidate TBSs is at most 1000 bits.

Optionally, before the step 103, the terminal device may further perform determining according to the preset condition, and determine whether to perform step 103 according to the determination result.

Specifically, determining whether to perform step 103 according to whether the terminal device meets the preset condition includes the following content:

When the terminal device meets the preset condition, the terminal device performs step 103;

When the terminal device does not meet the preset condition, the terminal device sends the message 3 to the network device according to the allowed TBS and the resource location indicated by the first indication information in the message 2.

The preset condition may be any one of the following preset conditions 1 to 3, or the preset condition is any one of the preset conditions 4 and 5, or the preset condition is the preset condition 6 In any one of 8 or above, the preset condition may be a combination of any one of the preset conditions 1 to 3 and any one of the preset conditions 6 to 8, or the preset condition is also It may be a combination of any one of the preset conditions 4 and 5 and any one of the preset conditions 6 to 8.

Preset condition 1: The coverage level corresponding to the message 1 sent by the terminal device to the network device is lower than the coverage level threshold;

Preset condition 2: the coverage level corresponding to the message 1 sent by the terminal device to the network device is higher than the coverage level threshold;

Preset condition 3: the coverage level corresponding to the message 1 sent by the terminal device to the network device is equal to the coverage level threshold;

Preset condition 4: the coverage level corresponding to the message 1 sent by the terminal device to the network device belongs to the coverage level set indicated by the base station;

Preset condition 5: the coverage level corresponding to the message 1 sent by the terminal device to the network device does not belong to the coverage level set indicated by the base station;

Preset condition 6: The TBS allowed by the terminal device is greater than the TBS threshold;

Preset condition 7: The TBS allowed by the terminal device is less than the TBS threshold;

Preset condition 8: The TBS allowed by the terminal device is equal to the TBS threshold.

The coverage level reflects the distance between the terminal device and the network device, or the cell coverage quality or the quality of the signal link. The smaller the current coverage level of the terminal device, the closer the terminal device is to the network device or the better the cell coverage quality or The better the signal link quality.

The foregoing coverage level threshold may be an appointment value, or may be notified to the terminal device by the network device by using the indication information (for example, by notifying the terminal device by carrying the parameter in the message), the indication information is used to indicate the coverage level threshold. The specific value of the above coverage level threshold may be 2.

The foregoing coverage level set may be an appointment set, or the network device notifies the terminal device by using the indication information (for example, by notifying the terminal device by carrying the parameter in the message), the indication information is used to indicate the coverage level set.

Similarly, the foregoing TBS threshold may be an agreed value, or may be notified to the terminal device by the network device by using the indication information, where the indication information is used to indicate the TBS threshold.

The current coverage level of the terminal device may be determined by the terminal device according to the measurement result of the measurement quantity and the threshold value of the measurement quantity, wherein the threshold value of the measurement quantity is determined by parameters configured by the network device.

The above measurement quantity may be Reference Signal Received Power (RSRP), or the measurement quantity is Narrowband Reference Signal Received Power (NRSRP).

Optionally, the terminal device may determine, according to the measurement result of the current measurement quantity and the threshold value of the measurement quantity configured by the network device, a coverage level corresponding to the message 1 sent by the terminal device to the network device.

For example, the base station is configured with a threshold of NRSRP, and the threshold of the NRSRP includes an NRSRP threshold 1 and an NRSRP threshold 2.

When the NRSRP measurement quantity of the terminal device is lower than the NRSRP threshold 1, the coverage level corresponding to the message 1 sent by the terminal device to the network device is 0; when the NRSRP measurement quantity of the terminal device is greater than or equal to the NRSRP threshold 1 being lower than the NRSRP threshold 2, the terminal device The coverage level corresponding to the message 1 sent to the network device is the coverage level 1. When the NRSRP measurement quantity of the terminal device is higher than the NRSRP threshold 2, the coverage level corresponding to the message 1 sent by the terminal device to the network device is the coverage level 2.

It should be understood that when determining the coverage level corresponding to the message 1 sent by the terminal device to the network device, the network device configures the corresponding message 1 resource for each coverage level.

Optionally, the candidate TBS may be selected according to a column in which the allowed TBS is located. For example, in Table 1, if the allowed TBS is 504 bits and the number of resource units is 5, the TBS in the column corresponding to I _RU equal to 4 determines the candidate TBS. The candidate TBS may be less than or equal to the allowed TBS.

104. Send a message 3 to the network device.

For the terminal device, after receiving the message 2, it is checked whether the preamble sequence sent before the terminal device is carried in the message 2. If the message 2 does not include the preamble sequence sent by the terminal device, the random access fails, the terminal device needs to perform step 101 to resend the message 1 again; if the message 2 includes the preamble sequence sent by the terminal device, the terminal device The message 3 is transmitted according to the time-frequency resource indicated by the uplink grant (UL grant) in the random access response corresponding to the preamble sequence. When transmitting the message, the terminal device carries the Cell radio network temporary identifier (C-RNTI) of the terminal device or the terminal device identifier from the core network in the message 3. Therefore, the message 3 carries the unique identifier of the UE, and is used to identify the current terminal device that requests access.

Illustratively, the message 3 may further include other necessary steps. For example, the terminal device receives the contention resolution message, that is, the message 4, from the network device, and may refer to the prior art.

In addition, message 3 in step 104 contains uplink data transmitted in accordance with the target TBS. That is to say, the uplink data can be sent to the network device through the message 3, so that the uplink data is sent to the network device in the random access process.

The present application can freely select a target TBS from the candidate TBS according to the allowed TBS, and the selected target TBS is less than or equal to the allowed TBS. Therefore, the present application can allow the terminal device to independently select a suitable TBS without having to completely use the network device. The indicated allowed TBS improves the flexibility of the terminal device to determine the TBS, thereby improving the transmission efficiency of the uplink data in the random access process.

Optionally, as an embodiment, determining the target TBS in the candidate TBS according to the allowed TBS, specifically: determining, according to the allowed TBS, at least one TBS in the candidate TBS; according to the size of the uplink data, from at least A target TBS that can be used to transmit uplink data is determined in one TBS.

The TBS of each of the at least one TBS is less than or equal to the allowed TBS.

It should be understood that the at least one TBS may form a first TBS set, and determining, from the at least one TBS, a target TBS that can be used for transmitting uplink data is actually determining a target TBS that can be used for transmitting uplink data from the first TBS set. . Herein, the meaning of the first TBS set representation is consistent with the meaning of the at least one TBS described above, and the related content of the first TBS set is directly described below.

The following is a detailed description of determining the first TBS set in the candidate TBS according to the allowed TBS, and determining the target TBS that can be used for transmitting the uplink data from the first TBS set according to the uplink data size.

(1) The first TBS set is determined in the candidate TBS according to the allowed TBS.

Specifically, any of the first mode to the fourth mode may be employed to determine the first TBS set.

The first mode is: determining, by using a TBS that is less than or equal to the allowed TBS in the candidate TBS, a preset number of TBSs as the TBS in the first TBS set.

The first method is equivalent to first determining a second TBS set from the candidate TBS, where any one of the second TBS sets is less than or equal to the allowed TBS, and then, from the second TBS set. A preset number of TBSs are selected as the TBS in the first TBS set.

In the first mode, when a preset number of TBSs are selected from the second TBS set, the selection may be performed in descending order of values, and the TBS with a larger value is preferentially selected as the first TBS set. TBS until the number of selected TBSs reaches the preset number.

For example, the candidate TBS is {TBS1, TBS2, TBS3, TBS4, TBS5, TBS6}, wherein the values of TBS1 to TBS6 are sequentially {144, 328, 504, 680, 872, 1000}, and the maximum TBS allowed is 900. Only TBS6 in the candidate TBS is larger than the maximum allowed TBS. Therefore, TBS1 to TBS5 in the candidate TBS may be determined as elements in the second TBS set, and the obtained second TBS set is {TBS1, TBS2, TBS3, TBS4, TBS5. }. Next, four TBSs are selected from the second TBS set in descending order of values as TBSs in the first TBS set, and the first TBS set is obtained as {TBS2, TBS3, TBS4, TBS5}.

Optionally, in the first manner, when a preset number of TBSs are selected from the second TBS set, the TBS values may be selected in descending order, and the TBS with a smaller value is preferentially selected as the first TBS. The TBS in the set until the number of selected TBSs reaches the preset number.

Optionally, in the first manner, when a preset number of TBSs are selected from the second TBS set, a preset number of TBSs are randomly selected from the second TBS set without considering the size of the TBS value.

Optionally, when the maximum TBS allowed to be used is TBSn, the terminal device may specifically map, according to a preset rule, a TBS (n is an integer greater than or equal to 1) TBS: TBS1 that may be sent in the available resources. TBS2...TBSn, and then select a certain TBS from the n types of TBSs as the target TBS according to the size of the uplink data.

For example, as shown in Table 1, when the I _TBS = 10 indicated in the uplink grant information and the maximum allowed TBS is 1000 bits, then according to Table 1, the candidate TBS is {144, 328, 504, 680, 872, 1000}. If each TBS in the candidate TBS is less than or equal to 1000 bits, then 1000, 872, 680, and 504 may be selected from the candidate TBSs in descending order as the first TBS set, and the first TBS set is obtained as {504. , 680, 872, 1000}.

As shown in Table 1, when the I _TBS indicated by the uplink grant information is another value, the first TBS set can also be determined in a manner similar to the previous paragraph. For example, the maximum TBS allowed to be used is 1000 bits. When I _TBS = 4 indicated in the uplink grant information, the obtained first TBS set is {408, 552, 680}, when I _TBS = 8 indicated in the uplink grant information. The obtained first TBS set is {392, 536, 680, 808}.

Table 1

The second mode is: determining, from the TBS that is less than or equal to the allowed TBS in the candidate TBS, that the TBS is greater than the preset value as the TBS in the first TBS set.

Specifically, in the second mode, the second TBS set may be determined from the candidate TBS, where any one of the second TBS sets is less than or equal to the allowed TBS, and then from the second A TBS larger than a preset value is selected in the TBS set as a TBS in the first TBS set.

For example, the candidate TBS is {TBS1, TBS2, TBS3, TBS4, TBS5, TBS6}, wherein the values of TBS1 to TBS6 are sequentially {144, 328, 504, 680, 872, 1000}, and the maximum allowed TBS value is 900. Only TBS6 in the candidate TBS is greater than the maximum allowed TBS. Therefore, TBS1 to TBS5 in the candidate TBS may be determined as elements in the second TBS set, and the obtained second TBS set is {TBS1, TBS2, TBS3, TBS4. , TBS5}. Next, a TBS whose value is greater than 500 (where 500 is only an example, and other values can be set according to the situation in actual processing) is selected from the second TBS set as the TBS in the first TBS set. Since only the values of TBS3, TBS4, and TBS5 in the second TBS set are greater than 500, the first TBS set is obtained as {TBS3, TBS4, TBS5}.

The third method is: determining, from the TBS that is less than or equal to the allowed TBS, the TBS that is greater than the preset value, and then selecting the preset number of TBSs from the TBS that is greater than the preset value as the first TBS set. TBS in.

Specifically, in the third mode, the terminal device first determines the second TBS set from the candidate TBS, and any one of the second TBS sets is less than or equal to the allowed TBS, and then from the second TBS. A TBS greater than a preset value is selected in the set as a TBS in the third TBS set, and finally a preset number of TBSs are selected from the third TBS set as a TBS in the first TBS set.

For example, the candidate TBS is {TBS1, TBS2, TBS3, TBS4, TBS5, TBS6}, wherein the values of TBS1 to TBS6 are sequentially {144, 328, 504, 680, 872, 1000}, and the maximum allowed TBS is 900 bits. Only TBS6 in the candidate TBS is larger than the maximum allowed TBS. Therefore, TBS1 to TBS5 in the candidate TBS may be determined as elements in the second TBS set, and the obtained second TBS set is {TBS1, TBS2, TBS3, TBS4, TBS5. }. Then, TBSs (TBS4, TBS5, and TBS6) greater than 550 are selected as the third TBS set from the second TBS set, and the third TBS set is obtained as {TBS4, TBS5, and TBS6}, and finally from the third TBS set. Selecting 2 TBSs (TBS5 and TBS6) from the largest to the smallest as the TBS in the first TBS set, and obtaining the first TBS set as {TBS5, TBS6}

The fourth mode is: determining a preset number of TBSs from the TBSs that are less than or equal to the allowed TBSs in the candidate TBS, and then selecting a TBS greater than the preset value from the preset number of TBSs as the first TBS set. TBS.

Specifically, in the fourth mode, the terminal device first determines a second TBS set from the candidate TBS, where any one of the second TBS sets is less than or equal to the allowed TBS, and then from the second TBS. A preset number of TBSs are selected as the TBSs in the third TBS set, and finally TBSs larger than the preset value are selected from the third TBS set as the TBSs in the first TBS set.

For example, the candidate TBS is {TBS1, TBS2, TBS3, TBS4, TBS5, TBS6}, wherein the values of TBS1 to TBS6 are sequentially {144, 328, 504, 680, 872, 1000}, and the maximum allowed TBS is 900 bits. Only TBS6 in the candidate TBS is larger than the maximum allowed TBS. Therefore, TBS1 to TBS5 in the candidate TBS may be determined as elements in the second TBS set, and the obtained second TBS set is {TBS1, TBS2, TBS3, TBS4, TBS5. }. Next, four TBSs (TBS2, TBS3, TBS4, and TBS5) are selected from the second TBS set in descending order of values as TBSs in the third TBS set, and the third TBS set is obtained as {TBS2, TBS3. And TBS4, TBS5}, and finally select TBS {TBS4, TBS5} whose value is greater than 600 from the TBS in the third TBS set as the TBS in the first TBS set, and obtain the first TBS set as {TBS4, TBS5}.

It should be understood that the foregoing third mode and the fourth mode are respectively equivalent to the combination of the foregoing first mode and the second mode, respectively, in the first mode and the second mode, after determining the second TBS set And selecting, by the second TBS set, a preset number of TBSs or TBSs greater than a predetermined value as the TBSs in the first TBS set. In the third mode and the fourth mode, after determining the second TBS set, the preset value is greater than the preset value, and the third type is compared with the first type and the second mode. The mode and the fourth mode can select a TBS that better matches the uplink data to be finally transmitted from the candidate TBS, and simplifies the process of determining the target TBS from the first TBS set according to the uplink data size.

The seventh mode is: determining, by using a TBS that is less than or equal to the allowed TBS in the candidate TBS, a preset number of TBSs as the TBS in the first TBS set.

Specifically, in the seventh mode, the second TBS set may be determined from the candidate TBS, where the second TBS set includes at least the TBS allowed to be used. Any one of the TBSs in the second set is less than or equal to the allowed TBS. Then, from the second set, a predetermined number of TBSs are selected at equal intervals.

In the foregoing second set, the predetermined number of TBSs are equally spaced, and may be equal to each other according to the equal TBS interval, that is, the difference between the TBSs that are sequentially selected, starting from the allowed TBS, and from large to small. Order until a preset number of TBSs are selected.

In the foregoing second set, the predetermined number of TBSs may be selected in equal intervals, and may be in the TBS column corresponding to the resource unit, according to the equally spaced TBS index, that is, the difference between the indexes corresponding to the TBSs sequentially selected. Equally, starting from the index corresponding to the allowed TBS, in descending order, until a preset number of TBSs are selected as the TBS in the first TBS set. For example, the TBS column corresponding to the resource unit is a column in which I _RU is equal to 4, and the allowed TBS is 872, and the corresponding index I _TBS is equal to 10. Then, according to the interval 2, four from the largest to the smallest. The TBS index is 10, 8, 6, 4, that is, the TBS in the first TBS set is 872, 680, 504, 328.

In the foregoing second set, the predetermined number of TBSs may be selected at equal intervals, which may be equal to the ratio of the TBSs, that is, the ratios of the TBSs sequentially selected are equal, starting from the allowed TBS, from large to small. The order until the preset number of TBSs is selected. For example, the preset value is 4, and the TBS in the selected first TBS set is the allowed TBS, TBS1, TBS2, and TBS3, and the ratio between the adjacent TBSs is allowed to be used by TBS/TBS1, TBS1/TBS2, TBS2/TBS3, the ratio is nearly equal. The ratios are nearly equal to each other. It can be understood that the difference between the individual ratios is less than a threshold, such as 0.2.

The eighth mode: determining, from the candidate TBS that is less than or equal to the maximum allowed TBS, determining a preset number of TBSs greater than a preset value as the TBS in the first TBS set.

Specifically, in the eighth mode, the second TBS set may be determined from the candidate TBS, where the second TBS set includes at least a maximum TBS (TBS _max ) and a minimum TBS (TBS _min ) that are allowed to be used. TBS _min is a TBS that is equal to the preset value, or is closest to the preset value and greater than the preset value, or is directly specified by the protocol. Then, from the second set, a preset number of TBSs are selected at equal intervals as the TBS in the first TBS set.

In the foregoing second set, the predetermined number of TBSs may be selected at equal intervals, and the TBS _max and TBS _min may be selected first, and then the difference between the TBSs that are sequentially selected according to the equal TBS interval is equal, and may be from TBS _max. At the beginning, in order from large to small, it is also possible to start from TBS _min , in order from small to large, until a preset number of TBSs are selected.

In the foregoing second set, the predetermined number of TBSs may be selected at equal intervals, and the TBS _max and TBS _min may be selected first, and then the difference between the TBSs that are sequentially selected according to the equal TBS interval is equal, and may be from TBS _max. At the beginning, in order from large to small, it is also possible to start from TBS _min , in order from small to large, until a preset number of TBSs are selected.

In the foregoing second set, the predetermined number of TBSs are selected at equal intervals, and the TBS _max and TBS _min may be selected first.

According to the ratio of the TBS, the ratio between the TBSs sequentially selected is nearly equal. For example, the preset value is 4, and the TBS in the selected first TBS set is TBS _max , TBS1, TBS2, TBS _min , and the ratio between adjacent TBSs is TBS _max /TBS1, TBS1/TBS2, TBS2/TBS _Min , the ratio is nearly equal.

(2) Determining, from the first TBS set (at least one TBS), a target TBS that can be used to transmit the uplink data according to the size of the uplink data.

Specifically, the terminal device may determine, from the first TBS set, a target TBS that matches the uplink data according to the size of the uplink data. The target TBS that matches the uplink data may refer to a TBS in the first TBS set that is greater than or equal to the size of the TB corresponding to the uplink data, and the difference in the size of the TB corresponding to the uplink data is within a certain range.

Optionally, the following two manners (the fifth mode and the sixth mode) may be used to determine, from the first TBS set, a target TBS that can be used to transmit the uplink data.

The fifth method is: first determining a TBS in the first TBS set that is greater than or equal to the size of the corresponding TB, and then arbitrarily selecting one TBS from the size of the TB corresponding to the uplink data in the first TBS set as the target TBS. .

For example, the first TBS set is {TBS2, TBS3, TBS4, TBS5}, the values of TBS2 to TBS5 are respectively {328, 504, 680, 872}, and the size of the TB corresponding to the uplink data is 500 bits, then, the first can be from the first The TBS in the TBS set that is greater than or equal to the TB size corresponding to the uplink data is {TBS3, TBS4, TBS5}, and then one TBS (such as TBS4) is arbitrarily selected from the {TBS3, TBS4, TBS5} as the target TBS.

The sixth method is: first determining a TBS in the first TBS set that is greater than or equal to the size of the TB corresponding to the uplink data, and then selecting a value from the first TBS set that is greater than or equal to the TB corresponding to the uplink data. TBS is the target TBS.

For example, the first TBS set is {TBS2, TBS3, TBS4, TBS5}, the values of TBS2 to TBS5 are respectively {328, 504, 680, 872}, and the size of the TB corresponding to the uplink data is 500 bits, then, the first can be from the first The TBS in the TBS set that is greater than or equal to the TB size corresponding to the uplink data is {TBS3, TBS4, TBS5}, and then selects the TBS (TBS3) with the smallest value from the {TBS3, TBS4, TBS5} as the target TBS.

It should be understood that, when determining the target TBS, a TBS with the largest value may be selected from the size of the TB corresponding to the uplink data in the first TBS set as the target TBS.

Alternatively, when determining the target TBS, the TBS whose value of the TB corresponding to the uplink data is within a certain preset range may be selected from the size of the TB corresponding to the uplink data in the first TBS set as the target TBS. .

For example, the first TBS set is {TBS1, TBS2, TBS3}, where TBS1 is 504bit, TBS2 is 680bit, TBS3 is 872bit, and uplink data corresponds to TB size of 650bit, in TBS1, TBS2 and TBS3, TBS2 and TBS3 The difference between the size of the TB corresponding to the TBS2 and the uplink data is 30 bits, and the difference between the size of the TB corresponding to the uplink data is 222 bits, and the difference between the size of the TB corresponding to the uplink data and the difference of the TBS is assumed. If the range is less than or equal to 250 bits, and the difference between TBS2 and TBS3 and the uplink data is within the preset range of the difference, then one TBS can be arbitrarily selected from TBS2 and TBS3 as the target TBS.

Optionally, as an embodiment, the message 1 is carried on the first resource, where the message 1 is carried on the first resource, and is used to indicate that the uplink data is sent to the network device by using the message 3. The first resource may be preset for implementing the indication function.

In this application, whether the message 1 is carried on a specific resource can flexibly indicate whether the uplink data is transmitted during the random access process, so that the network device can receive the uplink data.

Specifically, when the message 1 is carried on a specific resource (the first resource is a specific resource), the network device performs uplink data reception in the random access process, and when the message 1 is carried on other resources than the specific resource. When the network device completes the random access (specifically, after the RRC link is established), the uplink data can be received.

It should be understood that, in the present application, it is also possible to not limit whether the message 1 is carried on a specific resource, that is, whether the message 1 is sent on any resource, the uplink data may be transmitted to the network device in the random access process. .

It should be understood that after the message 3 is sent to the network device, the network device decodes the message 3 to obtain the uplink data in the message 3. If the network device decodes the message 3, the network device requests to resend the message. 3, the specific process can be as shown in Figure 5.

FIG. 5 is a flowchart of a method for transmitting data in a random access procedure according to an embodiment of the present application. The method shown in FIG. 5 can be performed by the terminal device. The method shown in FIG. 5 specifically includes steps 201 to 209. Steps 201 to 209 are respectively described in detail below.

201. The terminal device sends a message 1 to the network device.

The foregoing message 1 may specifically be a preamble sequence for enabling a random access procedure.

The above message 1 may be sent on a specific resource, and the message device 1 is sent on a specific resource to indicate that the terminal device will send uplink data to the network device in the random access procedure.

202. The terminal device receives the message 2 sent by the network device.

The above message 2 includes uplink grant information (UL grant), which in turn includes first indication information, which is used for the TBS allowed in the message 3.

The terminal device may determine the target TBS from the candidate TBSs according to the TBS allowed to be employed in the message 3 indicated by the first indication information. The specific manner of determining the target TBS from the candidate TBS can be referred to above.

The above candidate TBS is all available TBSs when message 3 can be sent.

The above steps 201 and 202 correspond to the above steps 101 and 102, respectively, and the above definitions and explanations of the steps 101 and 102 are equally applicable to the steps 201 and 202.

203. The terminal device sends a message 3 to the network device.

The message 3 includes uplink data transmitted according to the target TBS.

204. Whether the network device correctly decodes the message 3.

It should be understood that when the network device correctly decodes the message 3, the network device may acquire the uplink data from the message 3, and perform step 205. When the network device does not correctly decode the message 3, the network device may instruct the terminal device to resend the message 3. To complete the transmission of the uplink data, that is, to perform step 206.

205. The network device acquires uplink data from message 3.

206. The network device sends the second indication information to the terminal device. The second indication information is used to indicate resending the message 3 and the updated TBS used when resending the message 3.

207. The terminal device determines whether the updated TBS indicated by the second indication information is consistent with the target TBS.

When the updated TBS is consistent with the target TBS, it indicates that the network device correctly parses the target TBS, and the terminal device continues to transmit the uplink data according to the target TBS through the message 3, and the network device can then re-send the message according to the target TBS. 3 for decoding. Therefore, step 208 needs to be performed when the updated TBS is consistent with the target TBS.

When the updated TBS is inconsistent with the target TBS, it indicates that the network device does not correctly resolve the target TBS. Even if the terminal device subsequently retransmits the uplink data according to the target TBS through the message 3, the network device may not correctly decode the message. . Therefore, when the updated TBS is inconsistent with the target TBS, the random access needs to be re-executed, that is, step 209 is performed.

208. The terminal device resends the message 3 to the network device.

Specifically, the retransmitted message 3 contains uplink data transmitted in accordance with the target TBS.

209. The terminal device re-executes random access.

Specifically, when the updated TBS and the target TBS are inconsistent, the message 1 is sent to the network device again to re-execute the random access, where the retransmitted message 1 is carried on the second resource, and is used to indicate that the re-execution is performed randomly. After the access, the uplink data is sent to the network device, and the second resource is different from the first resource.

Optionally, when the message 1 sent in step 201 is carried on the first resource, the message 1 retransmitted when the random access is re-executed in step 209 may be carried on the first resource or the second resource. The first resource is different from the second resource. When the retransmitted message 1 is carried on the first resource, it indicates that the uplink data is still sent in the random access procedure, and when the retransmitted message 1 is on the second resource, it indicates that it will be first in the next process. The random access process is completed, and then the uplink data is sent to the network device.

Optionally, as an embodiment, the manner of message 3 is used to indicate the target TBS.

In the present application, the target TBS is indicated by the sending manner of the message 3, so that the network device can decode the message 3 according to the target TBS, which simplifies the decoding process.

Alternatively, the DMRS sequence used to send message 3 can be used to indicate the target TBS.

In the present application, the network device can determine the target TBS by determining which DMRS sequence is used to send the message 3, so as to facilitate accurate decoding according to the target TBS.

Specifically, the DMRS sequence has a one-to-one correspondence or a many-to-one relationship with the TBS, and one TBS can correspond to at least one DMRS sequence. When the message 3 is sent by using a certain DMRS sequence, the TBS corresponding to the DMRS sequence is the target TBS.

For example, the TBSs corresponding to the DMRS1, DMRS2, and DMRS3 sequences are TBS1, TBS2, and TBS3, respectively. Then, when the message 3 is transmitted using the DMRS2 sequence, the TBS2 is the target TBS.

It should be understood that the correspondence between the DMRS sequence and the TBS may be preset, and the correspondence between the DMRS sequence and the TBS is known to both the terminal device and the network device.

Optionally, the offset of the start time domain position of the physical uplink shared channel of the message 3 relative to the resource allocated by the network device in the time domain is used to indicate the target TBS.

Optionally, the foregoing starting time domain location may specifically be a starting symbol location.

In the present application, the network device can determine the target TBS by transmitting the offset of the starting time domain location of the physical uplink shared channel of the message 3 with respect to the resource allocated by the network device in the time domain, so as to facilitate accurate decoding according to the target TBS.

Specifically, the start time domain position of the physical uplink shared channel that sends the message 3 has a one-to-one correspondence or a many-to-one relationship with the TBS in the time domain relative to the resource allocated by the network device, and one TBS may correspond to at least one The offset value, when the sending message 3 corresponds to a certain offset value, the TBS corresponding to the offset value is the target TBS.

For example, the offset value of the start time domain position of the physical uplink shared channel for transmitting the message 3 relative to the resource allocated by the network device in the time domain includes offset1, offset2, offset3, and offset4, and the TBS corresponding to the offset values are respectively TBS1, TBS2, TBS3, and TBS4, then, when the initial time domain location of the physical uplink shared channel for transmitting message 3 is offset2 in the time domain relative to the resource allocated by the network device, TBS2 is the target TBS.

It should be understood that the correspondence between the foregoing offset value and the TBS may be preset, and the correspondence between the offset value and the TBS is known to both the terminal device and the network device.

The following is a description of a method for transmitting data in a random random access procedure according to an embodiment of the present application, taking a communication system composed of a terminal device and a base station as an example, and combining FIG. 6 and FIG.

301. The terminal device sends a PRACH preamble sequence (message 1) to the base station in a specific physical random access channel (PRACH) preamble sequence resource.

The specific PRACH preamble sequence resource is specifically used for Early Data Transmission (EDT). In this case, the terminal device will send uplink data during the random access procedure.

302. The base station detects the preamble sequence on the specific PRACH preamble sequence resource, determines that the uplink data transmission is an EDT, and determines to send the message 2 to the terminal device.

303. The base station sends a message 2 to the terminal device.

Since the base station cannot determine the size of the uplink data to be sent by the terminal device, the base station allocates the uplink resource according to a preset TBS (for example, TBSn), and uses the uplink grant in the random access response of the message 2 ( UL grant) allocates resources for the terminal device to send message 3.

As shown in FIG. 7, the terminal device first sends a message 1 to the base station, and after receiving the message 1, the base station sends a message 2 to the terminal device on the physical downlink control channel (PDCCH).

304. The terminal device maps, according to a preset rule, n types of TBSs that are possible to be transmitted in the allocated resources for the TBSn: TBS1, TBS2, ..., TBSn.

For example, as shown in Table 1, when the uplink grant indication in the message 2 indicates that I _TBS = 10 and the TBSn is 1000 bits, the terminal device maps the TBS for the TBSn to {144, 328, 504 according to a preset rule. 680, 872, 1000}.

305. The terminal device selects the most suitable TBS as the target TBS (which can be recorded as the selected TBS) according to the size of the uplink data that needs to be sent, among the n types of TBSs {TBS1, TBS2, . . . , TBSn} that may be sent, where The target TBS is used to transmit the uplink data in the message 3.

Specifically, the terminal device may select a TBS with the smallest padding ratio for transmitting the message 3. In addition, the message 3 includes a terminal ID of the terminal device and a Non Access Stratum Protocol Data Unit (NAS PDU) that needs to transmit uplink data.

306. The terminal device sends a message 3 according to the target TBS on the physical uplink shared channel.

For example, as shown in FIG. 7, the maximum TBS allowed by the network device is TBS2, and the terminal device selects TBS1 as the target TBS according to the size of the uplink data, and the terminal device sends the message 3 according to TBS1, because the resource corresponding to TBS2 is larger than the corresponding TBS1. The resource, therefore, the terminal device only uses part of the resources allocated by the network device in sending the message 3. As shown in FIG. 7, the resources allocated by the network device are partially surplus.

The manner in which the terminal device sends the message 3 is used to indicate the target TBS, and the base station can obtain the target TBS by using the message 3.

In addition, when the terminal device is an NB-IoT terminal device, the terminal device may also send the message 3 according to the target TBS on the narrowband physical uplink shared channel.

307. The base station determines the target TBS according to the sending manner of the message 3.

After determining the target TBS, the base station can demodulate and decode the message 3 according to the target TBS.

Alternatively, the DMRS sequence used to send message 3 can be used to indicate the target TBS.

For example, the sizes of the TBSs corresponding to DMRS1, DMRS2, DMRS3, and DMRS4 are 504bit, 680bit, 872bit, and 1000bit, respectively. Then, when the terminal device selects the 680bit TBS as the target TBS, the terminal device selects DMRS2 to send the message 3, so that When the eNB determines that the DMRS sequence corresponding to the message 3 is DMRS2, the size of the target TBS is determined to be 680 bits according to the corresponding relationship between the DMRS sequence and the TBS.

Optionally, the offset of the starting time domain location of the physical uplink shared channel of the message 3 relative to the resource allocated by the base station in the time domain is used to indicate the target TBS.

For example, the sizes of the TBSs corresponding to the offset values of offset1, offset2, offset3, and offset4 are 504 bits, 680 bits, 872 bits, and 1000 bits, respectively. Then, when the terminal device selects the 680-bit TBS as the target TBS, the terminal device follows the corresponding offset. The value is sent to message 3, so that when the base station determines that the offset value is offset2, the size of the target TBS can be determined to be 680 bits according to the corresponding relationship between the offset value and the TBS.

308. The base station demodulates and decodes the message 3.

309. The base station does not correctly decode the message 3. The base station retransmits the message 3 according to the determined target TBS scheduling terminal device.

It should be understood that the base station resends the message 3 in the scheduling terminal device only needs to schedule the terminal device to retransmit the uplink data according to the target TBS, and does not need to retransmit the uplink data according to the maximum TBS indicated in the message 2, and can save resources. For example, the maximum TBS indicated by the base station by the message 2 is 1000 bits, and the target TBS identified by the base station is 504 bits. Then, when the base station decodes the message 3, the base station retransmits the message 3 according to the 504-bit TBS scheduling terminal device.

Specifically, the base station may send a retransmission indication information to the terminal device, instructing the terminal device to resend the message 3, and the indication information may further indicate the updated TBS, so that the terminal device performs retransmission of the message 3 according to the updated TBS.

310. The terminal device determines whether the updated TBS matches the target TBS.

311. If the updated TBS matches the target TBS (specifically, the same), the terminal device retransmits the message 3. If the updated TBS does not match the target TBS, the terminal device device discards the random access procedure.

It should be understood that after the terminal device abandons the random access procedure, the terminal device may further initiate a random access procedure, and send uplink data to the base station in the random access procedure or after the random access procedure ends.

For example, as shown in FIG. 7, the base station blindly detects the TBS and decodes the message 3. When the base station does not correctly decode the message 3, the base station sends a retransmission indication information to the terminal device through the PDCCH, instructing the terminal device to resend the message 3. After receiving the retransmission indication information indication, the terminal device determines whether the updated TBS indicated by the retransmission indication information is consistent with the target TBS (the target TBS is TBS1 at this time), and if the updated TBS is consistent with the target TBS, the terminal device is The message 3 is retransmitted to the base station according to TBS1. When the updated TBS is consistent with the target TBS (the updated TBS is TBS1), the resource allocated by the base station for the terminal device is the resource corresponding to the TBS1, and the resource corresponding to the TBS1 can be used for all the retransmission of the message 3, and can be transmitted in the uplink data. Reduce waste of resources in the process.

The method for transmitting data in the random access process of the embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 7. The device for transmitting data in the random access process of the embodiment of the present application is described below with reference to FIG. 8 to FIG. In the detailed description, it should be understood that the method of transmitting data in the random access procedure of the embodiment of the present application can be performed by the apparatus in FIGS. 8 and 9. For the sake of brevity, the repeated description is appropriately omitted below.

FIG. 8 is a schematic block diagram of an apparatus for transmitting data in a random access procedure according to an embodiment of the present application. The apparatus 400 shown in Figure 8 includes:

The sending module 410 is configured to send a message 1 to the network device;

The receiving module 420 is configured to receive the message 2 sent by the network device, where the message 2 includes uplink grant information, where the uplink grant information includes first indication information, where the first indication information is used to indicate that the message is allowed in the message 3. The transport block size TBS used;

The processing module 430 is configured to determine, according to the allowed TBS, a target TBS in the candidate TBS, where the target TBS is less than or equal to the allowed TBS;

The sending module 410 is further configured to send a message 3 to the network device, where the message 3 includes uplink data transmitted according to the target TBS.

The present application can freely select a target TBS from the candidate TBS according to the allowed TBS, and the selected target TBS is less than or equal to the allowed TBS. Therefore, the present application can allow the terminal device to independently select a suitable TBS without having to completely use the network device. The indicated allowed TBS improves the flexibility of the terminal device to determine the TBS, thereby improving the transmission efficiency of the uplink data in the random access process.

Optionally, the receiving module 420 receives the second indication information sent by the network device. Correspondingly, the sending module 410 is further configured to resend the message 3 to the network device or send the message 1 to the network device again to perform random access again, with specific reference to the corresponding description in the previous method embodiment.

FIG. 9 is a schematic block diagram of an apparatus for transmitting data in a random access procedure according to an embodiment of the present application. The apparatus 500 shown in Figure 9 includes:

a memory 510, configured to store a program;

The transceiver 520 is configured to send a message 1 to the network device.

The transceiver 520 is further configured to receive the message 2 sent by the network device, where the message 2 includes uplink grant information, the uplink grant information includes first indication information, and the first indication information is used to indicate that the message 3 is The transport block size TBS allowed in use;

The processor 530 is configured to execute a program stored in the memory 510. When the program in the memory 510 is executed, the processor 530 is specifically configured to determine a target in the candidate TBS according to the allowed TBS. a TBS, the target TBS is less than or equal to the allowed TBS;

The transceiver 520 is further configured to send a message 3 to the network device, where the message 3 includes uplink data transmitted according to the target TBS.

The present application can freely select a target TBS from the candidate TBS according to the allowed TBS, and the selected target TBS is less than or equal to the allowed TBS. Therefore, the present application can allow the terminal device to independently select a suitable TBS without having to completely use the network device. The indicated allowed TBS improves the flexibility of the terminal device to determine the TBS, thereby improving the transmission efficiency of the uplink data in the random access process.

The device 400 and the device 500 are specifically devices in a terminal device or a terminal device, and the device may include a chip or a chipset or a circuit board in the terminal device, and may also include other necessary software modules. The apparatus 400 and the apparatus 500 may perform various steps of a method of transmitting data in a random access procedure of an embodiment of the present application.

Device 500 can include one or more chips. For example, at least one of memory 510, transceiver 520, and processor 530 can include one or more chips. Processor 530 can execute the programs stored in memory 510 to implement the methods of the previous method embodiments. When the processor 530 needs to perform signal transceiving, the transceiving is implemented by controlling or invoking the transceiver 520. Accordingly, a transmit operation or a receive operation involved in a method embodiment may be considered to be performed by at least one of transceiver 520 and processor 530. The processor 530 acts as the initiator of the transmitting operation or the receiving operation, and the transceiver 520 acts as a specific executor of the transmitting operation or the receiving operation. For example, transceiver 520 can be a radio frequency unit including an upmixer for transmitting signals and a downmixer for receiving signals.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. For example, device 400 can be a software device or a hardware device. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be another division manner, for example, multiple modules or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or module, and may be electrical, mechanical or otherwise.

The method flow or function in the described embodiments can be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims (25)

1. A method for transmitting data in a random access process, comprising:

   Send a message 1 to the network device;

   Receiving a message 2 sent by the network device, where the message 2 includes uplink grant information, where the uplink grant information includes first indication information, where the first indication information is used to indicate a maximum transport block size allowed in the message 3. TBS;

   Determining, in the candidate TBS, a target TBS according to the maximum allowed TBS, the target TBS being less than or equal to the maximum allowed TBS;

   The message 3 is sent according to the target TBS, and the message 3 includes uplink data.
2. The method according to claim 1, wherein the determining the target TBS in the candidate TBS according to the maximum allowed TBS, including:

   Determining at least one TBS in the candidate TBS according to the maximum allowed TBS, wherein each of the at least one TBS is less than or equal to the maximum allowed TBS;

   Determining, from the at least one TBS, the target TBS that can be used to transmit the uplink data according to the size of the uplink data.
3. The method according to claim 1, wherein the determining the target TBS in the candidate TBS according to the maximum allowed TBS, including:

   The coverage level satisfies a preset condition, and the target TBS is determined in the candidate TBS according to the maximum TBS allowed to be used.
4. The method according to any one of claims 1-3, wherein the message 1 is carried on the first resource, and is used to indicate that the uplink data is sent to the network device by using the message 3.
5. The method of claim 4, wherein the method further comprises:

   Receiving, by the network device, second indication information, where the second indication information is used to indicate resending the message 3 and the updated TBS used when retransmitting the message 3;

   And in the case that the updated TBS and the target TBS are consistent, the message 3 is resent to the network device, and the retransmitted message 3 includes uplink data transmitted according to the target TBS.
6. The method of claim 4 or 5, wherein the method further comprises:

   Receiving, by the network device, second indication information, where the second indication information is used to indicate resending the message 3 and the updated TBS used when retransmitting the message 3;

   If the updated TBS and the target TBS are inconsistent, the message 1 is sent to the network device again to perform random access again, and the message 1 is carried on the second resource, and is used to indicate that the re-execution is completed. After the random access, the uplink data is sent to the network device, where the second resource is different from the first resource.
7. The method according to any of claims 1-6, wherein the manner of transmitting the message 3 is for indicating the target TBS.
8. The method according to claim 7, wherein the manner of transmitting the message 3 comprises at least one of the following: a DMRS sequence used when the message 3 is sent, and a physical uplink shared channel in which the message 3 is sent. The offset of the initial time domain location relative to the resources allocated by the network device in the time domain.
9. An apparatus for transmitting data in a random access process, comprising:

   a sending module, configured to send a message 1 to the network device;

   a receiving module, configured to receive the message 2 sent by the network device, where the message 2 includes uplink authorization information, where the uplink authorization information includes first indication information, where the first indication information is used to indicate that the message 3 is allowed to be used. Maximum transport block size TBS;

   a processing module, configured to determine, in the candidate TBS, a target TBS according to the maximum allowed TBS, where the target TBS is less than or equal to the maximum allowed TBS;

   The sending module is further configured to send a message 3 to the network device according to the target TBS, where the message 3 includes uplink data.
10. The device according to claim 9, wherein the processing module is specifically configured to:

    Determining at least one TBS in the candidate TBS according to the maximum allowed TBS, wherein each of the at least one TBS is less than or equal to the maximum allowed TBS;

    Determining, from the at least one TBS, the target TBS that can be used to transmit the uplink data according to the size of the uplink data.
11. The method according to claim 9, wherein the determining the target TBS in the candidate TBS according to the maximum allowed TBS, including:

    The coverage level satisfies a preset condition, and the target TBS is determined in the candidate TBS according to the maximum TBS allowed to be used.
12. The device according to any one of claims 9-11, wherein the message 1 is carried on the first resource, and is used to indicate that the uplink data is sent to the network device by using the message 3.
13. The apparatus according to claim 12, wherein the receiving module is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate resending the message 3 and The updated TBS used when transmitting the message 3;

    The sending module is further configured to resend the message 3 to the network device if the updated TBS and the target TBS are consistent, and the retransmitted message 3 includes the transmission according to the target TBS. Upstream data.
14. The device according to claim 12 or 13, wherein the receiving module is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate to resend the message 3 and The updated TBS used when resending the message 3;

    The sending module is further configured to send a message 1 to the network device to re-execute random access, where the updated TBS and the target TBS are inconsistent, and the message 1 is carried on the second resource. And configured to send uplink data to the network device after completing re-execution of random access, where the second resource is different from the first resource.
15. The apparatus according to any one of claims 9 to 14, wherein the manner of transmitting the message 3 is for indicating the target TBS.
16. The apparatus according to claim 15, wherein the manner of transmitting the message 3 comprises at least one of the following: a DMRS sequence used when the message 3 is sent, and a physical uplink shared channel in which the message 3 is sent. The offset of the initial time domain location relative to the resources allocated by the network device in the time domain.
17. A communication device, comprising a processor for coupling with a memory, reading and executing instructions in the memory to implement the method of any of claims 1-8.
18. The communication device of claim 17 further comprising said memory.
19. A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any of claims 1-8.
20. A communication method, comprising:

    Receiving a message 1 sent by the terminal device;

    In response to the message 1, the message 2 is sent to the terminal device, where the message 2 includes uplink grant information, where the uplink grant information includes first indication information, where the first indication information is used to indicate the maximum transmission allowed in the message 3. Block size TBS;

    Determining a target TBS according to the message 3 sent by the terminal device, where the target TBS is less than or equal to the maximum allowed TBS;

    The message 3 is decoded according to the target TBS.
21. The method according to claim 20, wherein the message 1 is carried on the first resource, and is used to indicate that the uplink data is sent to the network device by using the message 3.
22. A communication device, comprising a processor for coupling with a memory, reading and executing instructions in the memory to implement the method of claim 20 or 21.
23. The communication device of claim 22, further comprising said memory.
24. A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of claim 20 or 21.
25. A communication system comprising the communication device according to claim 17 or 18 and the communication device according to claim 22 or 23.

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