CN112040558B

CN112040558B - Uplink data transmission method and device in random access process

Info

Publication number: CN112040558B
Application number: CN202010787042.XA
Authority: CN
Inventors: 沈霞; 杨思远; 闫志宇; 杜滢; 焦慧颖; 刘晓峰; 魏贵明; 徐菲
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-01-18
Anticipated expiration: 2040-08-07
Also published as: CN112040558A

Abstract

The application discloses an uplink data transmission method in a random access process, which comprises the following steps: acquiring configuration information, DCI (Downlink control information) and RAR (resource-relative-Address-Rate) indication information, wherein the configuration information comprises one or more Msg3 repeated transmission parameters, if the DCI or RAR indication information comprises information indicating the number of Msg3 repeated transmission times, the number of Msg3 repeated transmission times is determined according to the DCI or RAR indication information, if the information indicating the number of Msg3 repeated transmission times is not acquired from the DCI or RAR indication information, and the configuration information further comprises first leading grouping information and/or RO grouping information, the number of Msg3 repeated transmission times is determined from the configuration information according to a selected leading sequence and RO resources; and repeating transmission on the Msg3 information according to the determined number of the Msg3 repeated transmission times. The application also includes a device applying the method. The method solves the problems of poor flexibility and low resource utilization rate of the existing method, and is particularly suitable for the RACH technology of the mobile communication system.

Description

Uplink data transmission method and device in random access process

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for uplink data transmission in a random access process.

Background

The current standard does not support PUSCH retransmission scheduled based on uplink Grant (UL Grant) in Random Access Response (RAR), so Msg3 scheduled based on UL Grant in RAR only supports one transmission, and when the base station does not successfully receive Msg3, retransmission of Msg3 can be scheduled through DCI. The main problem of the DCI-based retransmission mechanism is to introduce new scheduling signaling overhead and scheduling delay, which reduces transmission efficiency. The prior art proposes a repeat transmission technology supporting Msg3 and uplink transmission in RRC connected state, that is, a common Msg3 repeat transmission parameter (e.g., Msg3-aggregation factor) is configured on an initial uplink BWP or an Msg3 repeat transmission parameter is indicated in DCI scheduling a PDSCH corresponding to a RAR, so Msg3 will continuously repeat transmission multiple times based on scheduling in the RAR, but the flexibility is poor and the resource utilization rate is low.

Disclosure of Invention

The application provides an uplink data transmission method and equipment in a Random Access process, solves the problems of poor flexibility and low resource utilization rate of the existing method, and is particularly suitable for an RACH (Random Access Channel) technology of a mobile communication system.

In a first aspect, the present application provides a method for uplink data transmission in a random access process, including the following steps:

acquiring configuration information, DCI (Downlink control information) and RAR (resource-relative-Address-Rate) indication information, wherein the configuration information comprises one or more Msg3 repeated transmission parameters, if the DCI or RAR indication information comprises information indicating the number of Msg3 repeated transmission times, the number of Msg3 repeated transmission times is determined according to the DCI or RAR indication information, if the information indicating the number of Msg3 repeated transmission times is not acquired from the DCI or RAR indication information, and the configuration information further comprises first leading grouping information and/or RO grouping information, the number of Msg3 repeated transmission times is determined from the configuration information according to a selected leading sequence and RO resources; according to the determined number of the Msg3 repeated transmission, the Msg3 information is transmitted repeatedly; the Msg3 repeated transmission parameter is a public PUSCH repeated transmission parameter based on RAR scheduling, the value of the parameter corresponds to the repeated transmission times of the Msg3 information, the DCI information is DCI for scheduling PDSCH resources corresponding to the RAR, the RAR indication information is RAR corresponding to a leader sequence, the Msg3 information is a message related to a trigger random access process event in the random access process, and the RO resources are time-frequency resources for bearing the leader sequence of the random access.

Further, the configuration information, the DCI information, or the RAR indication information further includes Msg3 repeat transmission enable information for enabling or disabling the repeat transmission of the Msg3 message.

Further, each group of preamble sequences obtained by grouping the first preamble grouping information uniquely corresponds to one Msg3 repeated transmission time.

Further, the RO resources are grouped according to the RO grouping information, and each group of RO resources uniquely corresponds to one Msg3 repeated transmission times.

Further, if the preamble sequences of the random access are grouped according to the second preamble grouping information, each group of preamble sequences grouped according to the second grouping information is further grouped according to the first preamble grouping information, and each group of preamble sequences obtained according to the first preamble grouping information uniquely corresponds to one Msg3 repeated transmission times.

Preferably, each set of preamble sequences uniquely corresponds to a preset first RSRP threshold range, and the selected preamble sequence is determined according to the RSRP measurement value.

Preferably, the grouping of RO resources according to RO grouping information is implemented in the following manner: and providing a RO resource configuration for each group of RO resources or grouping the RO resources under the same RO resource configuration.

Preferably, each set of RO resources uniquely corresponds to a preset second RSRP threshold range, and the selected RO resources are determined according to the RSRP measurement value.

Preferably, if the Msg3 message is sent by using an active upstream BWP, the Msg3 repeat transmission use parameter is determined by the configuration information on the initial upstream BWP.

The method according to any one of the embodiments of the first aspect of the present application, applied to a terminal device, includes the following steps:

receiving the configuration information, the DCI information and the RAR indication information, if the information indicating the Msg3 repeated transmission times in the DCI information and the RAR indication information is not detected, and first leading grouping information and/or RO grouping information in the configuration information is detected, selecting a leading sequence and RO resources in a random access process, determining the Msg3 repeated transmission times, and sending the selected leading sequence; if the information indicating the number of the Msg3 repeated transmission times in the DCI information and the RAR indication information is detected, determining the number of the Msg3 repeated transmission times; and sending the Msg3 information according to the number of the repeated transmission of the Msg 3.

The method according to any one of the embodiments of the first aspect of the present application, for a network device, includes the following steps:

acquiring the configuration information, receiving and detecting a leader sequence, and sending corresponding RAR indication information and DCI information; and receiving and detecting the Msg3 information according to the number of times of the repeated transmission of the Msg 3.

In a second aspect, the present application further provides an uplink data transmission terminal device in a random access process, where with the method in any of the first aspects of the present application, the device includes: the terminal receiving module is used for receiving the configuration information, the DCI information and the RAR indication information; the terminal determining module is used for determining the number of times of the Msg3 repeated transmission; and the terminal sending module is used for sending the leader sequence and the Msg3 information.

In a third aspect, the present application further provides an uplink data transmission network device in a random access process, where with the method in any of the first aspects of the present application, the device includes: the network determining module is used for determining the configuration information and the number of times of Msg3 repeated transmission; the network receiving module is used for receiving the detection leader sequence and the Msg3 information; and the network sending module is used for sending the DCI information and the RAR indication information.

The present application also provides an uplink data transmission device in a random access process, including: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of the embodiments of the first aspect of the application.

The present application also proposes a computer-readable medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to any one of the embodiments of the first aspect of the present application.

The present application further provides a mobile communication system, which includes the network device according to any embodiment of the present application and the terminal device according to any embodiment of the present application.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

the invention provides a new Msg3 repeated transmission scheme, high-level semi-static Msg3 repeated transmission configuration jointly indicates the Msg3 repeated transmission with DCI (Downlink control information) of a PDSCH corresponding to scheduling RAR and RAR indication information, so that a cell can more flexibly schedule the Msg3 repeated transmission, a terminal can select the Msg3 repeated transmission times according to self requirements, and the selected Msg3 repeated transmission times are informed to the terminal through corresponding preambles and RO recessiveness. By using the scheme of the invention, unnecessary Msg3 repeated transmission can be reduced, the resource utilization efficiency is improved, and the transmission reliability of the Msg3 is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a flow chart of an embodiment of the method of the present application;

FIG. 2 is a flowchart of an embodiment of a method of the present application for a terminal device;

FIG. 3 is a flow chart of another embodiment of the method of the present application for a terminal device;

FIG. 4 is a flow chart of an embodiment of a method of the present application for a network device;

FIG. 5 is a schematic diagram of an embodiment of a terminal device;

FIG. 6 is a schematic diagram of an embodiment of a network device;

fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention;

fig. 8 is a block diagram of a terminal device of another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In mobile communication systems, such as 4G LTE and 5G systems, Random Access techniques including 4-step RACH (Random Access Channel) technique and 2-step RACH technique are employed.

In the 4-step RACH technique, 5 times of information interaction between the terminal and the base station is required to complete the random access procedure, which is: 1) the terminal sends a message Msg1 to the base station, wherein the Msg1 is a leader sequence and is used for the base station to carry out Timing Advance (TA) estimation; 2) the base station sends a message Msg2 to the terminal, wherein the Msg2 is a random access response of the Msg1 and comprises a leader sequence identifier, a TA (Timing Advance) indication, uplink authorization information of the Msg3 sent by the terminal to the base station, and a temporary cell radio network temporary identifier (TC-RNTI); 3) the terminal sends a message Msg3 to the base station, when the terminal reads a leader sequence identifier corresponding to Msg1 in Msg2, the terminal sends Msg3 by using an uplink authorization in Msg2, and the content of Msg3 is related to an event triggering a random access process; 4) the base station sends a message Msg4 to the terminal, the Msg4 is a response for solving the contention conflict, and when the Msg4 detected by the terminal contains relevant contention conflict solution identification information in the corresponding Msg3, the random access is considered to be successful; 5) the terminal that successfully detects Msg4 sends an ACK acknowledgement to the base station.

In the 2-step RACH technology, 3 times of information interaction is required between a terminal and a base station to complete a random access process, 1) the terminal sends MsgA to the base station, including a preamble and a PUSCH (Physical Uplink Shared Channel) associated with the preamble, wherein the PUSCH content is determined by a specific random access trigger event. And the transmission resource of the PUSCH is configured to the terminal through RRC signaling. MsgA carries the functionality of Msg1 and Msg3 in 4-step RACH. 2) After receiving the MsgA, the base station sends a corresponding random access response MsgB to the terminal, where the MsgB may send a multicast to a group of terminals that send preambles using the same RO (RACH opportunity), or may send a unicast to a terminal that informs a C-RNTI (Cell-Radio Network Temporary Identifier) to the base station in the MsgA. MsgB carries the functions of Msg2 and Msg4 in 4-stepRACH. For successful detection of the send preamble only in MsgA, the base station may respond to the terminal with a RAR identical to Msg2, scheduling the terminal to initiate Msg3 transmission. 3) And for the terminal with successful random access, feeding back an ACK (acknowledgement) message to the base station to complete the random access process.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is a flow chart of an embodiment of the method of the present application.

The embodiment provides an uplink data transmission method in a random access process, which can be used for a 2-step RACH technology and/or a 4-step RACH technology in the random access process, and comprises the following steps 101 to 102:

step 101, acquiring configuration information, DCI information and RAR indication information, and determining the number of times of the Msg3 repeated transmission.

In step 101, the Msg3 message according to the present invention is a message related to an event triggering a random access procedure in a random access procedure, and specifically corresponds to a message sent by the terminal to the base station for the second time in the 4-step RACH technology, and when the base station in the 2-step RACH technology successfully detects a preamble sent by the MsgA, the Msg3 message may respond to the terminal with a RAR similar to Msg2, and schedule the terminal to initiate Msg3 transmission.

In step 101, the configuration information includes one or more Msg3 retransmission parameters, a parameter value of which corresponds to the number of Msg3 retransmission times, the Msg3 retransmission parameters are common PUSCH retransmission parameters based on RAR scheduling, the configuration information is configuration information on a system initial uplink BWP (initial UL BWP), and the configuration information includes one or more common PUSCH (Msg3) retransmission parameters based on RAR scheduling (e.g., Msg 3-aggregate factor), and if the parameter value is N (N is an integer greater than or equal to 1), it indicates that the terminal will perform N retransmission on the Msg3 information if the terminal sends a PUSCH (Msg3 information) based on RAR scheduling on the initial uplink BWP.

Further, the N retransmission transmissions may be consecutive N-slot PUSCH transmissions, where each slot PUSCH transmission occupies the same symbol position; the N retransmission transmissions may also be N consecutive PUSCH transmissions, unsigned intervals of adjacent PUSCH transmissions, and the specific repeated transmission type may also be indicated in the configuration information.

It should be noted that the multiple Msg3 repeated transmission parameters and one Msg3 repeated transmission parameter include multiple values having the same meaning, and the Msg3 repeated transmission parameter is used to represent the number of times of repeated transmission of the Msg3 information.

In step 101, the manner in which the terminal acquires the configuration information may be that the base station sends the configuration information to the terminal, or writes the configuration information according to a protocol agreement device, or acquires the configuration information in a manner combining the above manners.

Step 101 further comprises: step 101A to step 101C.

Step 101A, if the DCI or the RAR indication indicates the Msg3 repeat transmission times, determining the Msg3 repeat transmission times according to the DCI or the RAR indication.

In step 101A, the DCI information is a DCI scheduling a PDSCH resource corresponding to the RAR. The base station may indicate, in DCI indicating a PDSCH resource corresponding to the RAR, an Msg3 repeat transmission parameter scheduled by the RAR, where a parameter value corresponds to the number of Msg3 repeat transmission times, and the parameter may be one of multiple Msg3 repeat transmission parameters indicated in the configuration information. In addition, the parameter may be one duplicate transmission parameter unrelated to the Msg3 duplicate transmission parameter indicated in the configuration information, and when the terminal detects the RAR corresponding to the transmission preamble in the corresponding PDSCH according to the DCI, the Msg3 information scheduled by the RAR performs duplicate transmission on the Msg3 according to the Msg3 duplicate transmission parameter indicated in the DCI.

In step 101A, the RAR indication information is an RAR corresponding to a preamble sequence. The base station may use the Msg3 repeat transmission parameter that indicates RAR scheduling in the MAC sub pdu (Media Access Control sub Protocol Data Unit, multimedia Access Control layer Protocol Data subunit) corresponding to the RAR, and the parameter value corresponds to the number of Msg3 repeat transmission times, where the parameter may be one of the multiple Msg3 repeat transmission parameters indicated in the configuration information; in addition, the parameter may also be a duplicate transmission parameter unrelated to the Msg3 duplicate transmission parameter indicated in the configuration information, and the terminal may perform duplicate transmission on Msg3 according to the Msg3 duplicate transmission parameter indicated in the RAR indication information.

Step 101B, if the configuration information further includes first preamble grouping information and information indicating the number of times of the Msg3 repeat transmission is not obtained from both the DCI information and the RAR indication information, determining a number of times of the Msg3 repeat transmission from the configuration information according to the selected preamble sequence.

In step 101B, the configuration information indicates the number of retransmission times of the Msg3 message based on the preamble packet, that is, different preamble packets correspond to different Msg3 retransmission times, and each group of preamble sequences obtained according to the first preamble packet message packet uniquely corresponds to one Msg3 retransmission times.

For example, the first grouping information divides the preamble sequences into M0(M0 is an integer greater than or equal to 2) groups, and each group of preamble sequences uniquely corresponds to one Msg3 repeat transmission number supported by configuration information, as shown in table 1 below:

table 1 first preamble packet information

Index	Number of Msg3 repeated transmissions	Preamble packet
			1	0	Group 1
2	R_Msg3_1	Group 2
			3	R_Msg3_2	Group 3
…	…	…
			M0	R_Msg3_M0-1	Group M0

In table 1 above, R _ Msg3_1, R _ Msg3_2, …, and R _ Msg3_ M0-1 repeat transmission times for one Msg3 supported by configuration in the configuration information.

For example, if the configuration information includes one Msg3 retransmission parameter, the preambles are divided into two groups, M0 ═ 2, where one group of preamble sequences corresponds to the terminal sending Msg3 information and no retransmission is applied, and the other group of preamble sequences corresponds to the terminal sending Msg3 information and a retransmission is applied.

Optionally, when the preamble sequence of the random access corresponding to the selected random access type has a packet, for example, the packet is divided into a preamble packet a and a group B, and when the PUSCH load required to be sent for triggering the random access exceeds a set size, the preamble sequence in the group B is selected to initiate the random access. Under the characteristic, different timing advance compensation corresponding leader groups are realized in the existing random access leader sequence groups to avoid leader sequence selection conflict.

Specifically, if the preamble sequences of the random access are grouped according to the second preamble grouping information, each group of preamble sequences grouped according to the second preamble grouping information is further grouped according to the first preamble grouping information, and each group of preamble sequences obtained according to the first preamble grouping information uniquely corresponds to one Msg3 repeated transmission times.

For example, when the preamble sequences of the random access corresponding to the selected random access type have been grouped into a group a and a group B according to the second preamble grouping information, the preamble sequences in the group a and the group B are further divided into M0 groups, respectively, corresponding to M0 Msg3 repeated transmission parameters, respectively, as shown in table 2 below, where M0 is the number of the first preamble groups.

TABLE 2 first and second preamble packet information

Index	Number of Msg3 repeated transmissions	Preamble packet a	Preamble packet B
				1	0	Group A1	Group B1
2	R_Msg3_1	Group A2	Group B2
				3	R_Msg3_2	Group A3	Group B3
…	…	…	…
				M	R_Msg3_M0-1	Group AM1	BM1 group

When M0 is 2, the preamble packet a includes an a1 th group and an a2 th group, the a1 th group does not apply the repeat transmission when the corresponding terminal sends the Msg3 information, and the a2 th group applies the repeat transmission when the corresponding terminal sends the Msg3 information. When the UE determines to select the preamble sequence in the preamble group A, if the Msg3 information is further determined not to adopt repetition, the preamble sequence in the A1 group under the preamble group A is selected to initiate random access, and if the Msg3 information is determined to adopt repetition transmission, the preamble sequence in the A2 group under the preamble group A is selected to initiate random access.

In step 101B, each set of preamble sequences uniquely corresponds to a preset first RSRP threshold range, and the selected preamble sequence is determined according to the RSRP measurement value.

That is, each preamble packet may correspond to a first RSRP threshold range, when initiating random access, according to the first RSRP threshold range in which the selected SSB (Synchronization Signal and PBCH block) corresponds to the RSRP measurement value, a preamble sequence in the corresponding preamble packet is selected to initiate repeated transmission, and the correspondence between the preset first RSRP threshold range and the preamble packet is shown in table 3 below, where the preamble sequences are divided into M0 groups.

TABLE 3 first RSRP threshold Range

In table 3 above, if the RSRP measurement value is greater than the first RSRP threshold, the preamble sequence selected by the terminal and sent to the base station is the 1 st group sequence of the preamble packet, and the terminal does not apply repeated transmission when sending the Msg3 message; if the RSRP measurement value is less than or equal to the first RSRP threshold and greater than the second RSRP threshold, the preamble sequence selected by the terminal and sent to the base station is a2 nd group sequence of preamble packets, and the corresponding Msg3 repetitive transmission parameter is R _ Msg3_1, … ….

Step 101C, if the configuration information further includes RO grouping information and information indicating the number of the Msg3 repetitive transmissions is not obtained from both the DCI information and the RAR indication information, determining one Msg3 repetitive transmission number from the configuration information according to the selected RO resource.

The RO resource is a time-frequency resource for bearing a leader sequence of random access.

In step 101C, RO resources are grouped according to the RO grouping information, each RO resource group uniquely corresponds to one Msg3 repeat transmission times, and the configuration information indicates the repeat transmission of Msg3 information based on RO configuration, that is, different RO resources correspond to different Msg3 repeat transmission times.

The configuration information includes one or more Msg3 repeat transmission times, and configures M1 groups of RO resources, where each group of RO resources corresponds to one Msg3 repeat transmission time configured and supported in the configuration information, as shown in table 4 below:

TABLE 4 RO packet

In table 4, R _ Msg3_1, R _ Msg3_2, …, R _ Msg3_ M1-1 repeat transmission times for one Msg3 configured to support in the configuration information.

For example, if the configuration information includes one Msg3 duplicate transmission parameter, the configured RO resources are divided into two groups, wherein one group of RO corresponds to the terminal not applying duplicate transmission when sending Msg3 information, and the other group of RO corresponds to the terminal applying duplicate transmission when sending Msg3 information.

In step 101C, the method for grouping RO resources according to RO grouping information is as follows: one RO resource configuration is provided for each group of RO resources, i.e., a specific implementation method of M3 RO groups may be to provide M1 RO resource configurations.

For example, when M1 is 2, 2 types of RO resource configurations are provided in the configuration information, and correspond to different Msg3 repeat transmission times, where one type of RO resource configuration determines a specific location of the RO resource through a time domain configuration index of a random access opportunity (e.g., prach-configuration index) and a frequency domain configuration indication of the random access opportunity (e.g., Msg 1-FDM). The time domain configuration index of the random access opportunity may determine a time slot position occupied by the random access opportunity in the time domain, a symbol position occupied by the random access opportunity in one time slot, and a symbol length occupied by one random access opportunity in the time domain, and a corresponding one random access time domain configuration index may correspond to one or more RO resources in the time domain. The frequency domain configuration indication of the random access opportunity may determine a frequency domain position occupied by the random access opportunity in the frequency domain, and a corresponding one of the random access frequency domain configuration indications may correspond to one or more RO resources in the frequency domain.

In step 101C, the method for grouping RO resources according to RO grouping information is as follows: the RO resources under the same RO resource configuration are grouped, and a specific implementation method of grouping M1 RO resources may also be to divide RO resources under one RO resource configuration into M1 groups.

Assuming that Z (Z is the number of ROs in one random access period and is an integer greater than or equal to 1) ROs are included in one random access period according to the random access configuration information, and assuming that an RO resource corresponds to P time domain RO indexes and Q frequency domain RO indexes in one random access period, Z is P × Q, and Z RO resources are divided into M1 groups, so that one random access period may be one or more random access configuration periods (PRACH configuration periods) or one or more random access opportunity association periods (PRACH association periods) or one or more random access opportunity association pattern periods (PRACH association periods) defined in the standard (38.321).

Alternatively, when the random access is configured with two random access types, such as 4-step RACH and 2-step RACH, if the 4-step RACH and the 2-step RACH adopt different RO configurations, such as different random access time domain configuration indexes. Under this feature, the RO packets corresponding to the number of times of the repeated transmission of the different Msg3 are implemented in the RO configuration corresponding to the random access type, as shown in table 5 below:

table 5 Msg3 repeat transmission parameters for two random access types

For example, when M1 is 2, when the UE determines to select 4-step RACH to initiate random access, if it is further determined that the Msg3 information does not employ repetition, the RO resource bearer preamble in the a1 th packet under the 4-step RACH configuration is selected to initiate random access, and if it is determined that the Msg3 employs repetition transmission, the RO resource bearer preamble in the a2 th packet under the 4-step RACH RO configuration is selected to initiate random access.

In step 101C, each group of RO resources uniquely corresponds to a preset second RSRP threshold range, the selected RO resource is determined according to the RSRP measurement value, and when the random access is initiated, according to the second RSRP threshold range of the RSRP measurement value measured correspondingly by the selected SSB, the RO bearer preamble sequence in the corresponding RO packet is selected to initiate the repeat transmission, as shown in table 6 below, the RSRP threshold range corresponding to the RO packet is labeled.

TABLE 6 second RSRP threshold range

In table 6 above, if the RSRP measurement value is greater than the first RO RSRP threshold, the time-frequency resource occupied by the preamble sequence sent to the base station selected by the terminal is the 1 st group of RO resources, and the corresponding Msg3 has no repeat transmission; if the RSRP measurement value is less than or equal to the first RO RSRP threshold and greater than the second RO RSRP threshold, the time-frequency resource occupied by the leader sequence sent to the base station selected by the terminal is the 1 st group RO resource, and the corresponding Msg3 repeated transmission parameter is R _ Msg3_1, … …

In steps 101B and 101C, it should be noted that the configuration information may include the first preamble packet information or the RO packet information, or may include the first preamble packet information and the RO packet information.

Optionally, in step 101, the configuration information, the DCI information, or the RAR indication information further includes Msg3 repeat transmission enable information for enabling or disabling repeat transmission of the Msg3 message.

The base station may enable or disable (enabled/disabled) the Msg3 retransmission in the configuration message, where enabling indicates that the Msg3 message retransmission is applied and disabling indicates that the Msg3 message retransmission is not applied, for example, setting a value of the Msg3 retransmission parameter to 0 indicates disabling.

Further, if the configuration information is used for the repeated transmission of the Msg3 message, the corresponding first preamble packet and RO packet in step 101B and step 101C can be considered as invalid, i.e. the preamble sequence and RO resource selected by the terminal to initiate random access both correspond to the no Msg3 message repeated transmission scenario.

The base station may also enable or disable (enabled/disabled) the repeated transmission of the Msg3 information in DCI (the DCI information) indicating the PDSCH resources corresponding to the RAR or in MAC subPDCU (the RAR indication information) corresponding to the RAR. For example, if the DCI information indicates that the repeated transmission of the Msg3 information is enabled or disabled (enabled/disabled) by 1-bit information, and the terminal detects the RAR corresponding to the transmission preamble in the corresponding PDSCH based on the DCI information, the Msg3 of the RAR scheduling enables or disables (enabled/disabled) the repeated transmission of the Msg3 information based on the indication in the DCI information. For example, if the RAR indication information indicates that the repeated transmission of the Msg3 information is enabled or disabled (enabled/disabled) by 1-bit information, and the terminal detects an RAR corresponding to the transmission preamble, the Msg3 of the RAR schedule enables or disables (enabled/disabled) the repeated transmission of the Msg3 according to the indication in the RAR.

Further, after the terminal selects the preamble sequence to initiate random access based on step 101B, when the enable or disable indication of the Msg3 repeat transmission is carried in the received DCI message or the received RAR indication message, the terminal indicates to enable or disable (enabled/disabled) the repeat transmission of Msg3 according to the DCI message or the RAR indication message.

Further, after the terminal selects an RO resource to initiate random access based on step 101C, if the enable or disable indication of the Msg3 repeat transmission is carried in the received DCI message or the received RAR indication message, the terminal indicates to enable or disable (enabled/disabled) the repeat transmission of Msg3 according to the DCI message or the RAR indication message.

Further, after the terminal selects a preamble sequence or an RO resource to initiate random access based on steps 101B and 101C, when the Msg3 repeat transmission times indication is carried in the received DCI message or the received RAR indication message, the terminal performs repeat transmission on Msg3 according to the DCI message or the RAR indication message indication.

Specifically, in step 101, if the configuration information includes the first preamble packet information and/or the RO packet information, and the terminal receives the DCI information or the RAR information indicating the number of times of the Msg3 repeated transmission, the terminal retransmits the Msg3 information according to the number of times of the Msg3 repeated transmission indicated by the DCI information or the RAR information.

In step 101, it should be noted that the base station determines the number of possible Msg3 retransmission times of the terminal according to the detection preamble sequence, the terminal may not apply Msg3 retransmission (e.g. a terminal initiating random access based on the existing protocol), may apply Msg3 retransmission (e.g. a terminal initiating random access based on the present invention), and the base station detects Msg3 according to the determination result.

Optionally, in step 101, if the Msg3 message is sent by using an active upstream BWP, the number of times of the Msg3 repeated transmission is determined by the configuration information on the initial upstream BWP.

If the Msg3 message sent by the terminal selects to activate uplink BWP (active UL BWP), instead of the initial uplink BWP, there is a possibility that the Msg3 retransmission parameter for PUSCH transmission is also configured on the uplink BWP (active UL BWP), and at this time, the problem of how to perform the retransmission of the Msg3 message by the terminal needs to be solved, and refer to the configuration on the activated uplink BWP or the retransmission configuration on the initial uplink BWP.

If the terminal configures or does not configure the PUSCH retransmission parameters in the dedicated configuration information, for example, the terminal configures or does not configure the PUSCH retransmission parameters on the currently activated uplink BWP (active UL BWP), if the terminal sends the Msg3 information on the activated uplink BWP, the terminal performs corresponding Msg3 information retransmission according to the Msg3 retransmission parameters configured on the initial uplink BWP.

Optionally, in step 101, the number of the repeated transmissions of the Msg3 is bound to the number of the repeated transmissions of the Msg1 or the number of the repeated transmissions of the MsgA PUSCH, for example, the number of the repeated transmissions of the Msg3 is equal to the number of the repeated transmissions of the Msg 1. And when the terminal selects the preamble sequence or the RO resource corresponding to the Msg3 repeated transmission times according to the step 101B or the step 101C, correspondingly determining the repeated transmission times of the corresponding Msg1 or MsgA PUSCH.

It should be noted that Msg1 is the information that is sent by the terminal to the base station for the first time in the four-step random access process, and MsgA is the information that is sent by the terminal to the base station for the first time in the two-step random access process.

And step 102, repeatedly transmitting the Msg3 information according to the determined Msg3 repeated transmission times.

In step 102, if the configuration information indicates the Msg3 repeat transmission parameter and the parameter value corresponds to the Msg3 repeat transmission times, the terminal performs repeat transmission on the Msg3 information according to the parameter.

Further optionally, if the Msg3 retransmission parameter is indicated in the configuration information, or in the DCI indicating the PDSCH resource corresponding to the RAR, or in the RAR indicating the enabling or disabling of the Msg3 retransmission, the terminal correspondingly enables or disables the retransmission of the Msg3 information.

Further optionally, if the Msg3 retransmission parameter is indicated in the DCI indicating the PDSCH resource corresponding to the RAR, the terminal performs retransmission on the Msg3 message according to the parameter indicated by the DCI. Or if the Msg3 retransmission parameter is indicated in the RAR indication information corresponding to the sending preamble ID, the terminal retransmits the Msg3 message according to the parameter indicated by the RAR indication information.

Further optionally, if the configuration information includes first preamble packet information, the terminal determines the number of times of the Msg3 retransmission, selects a preamble sequence in the corresponding preamble packet to initiate random access, and performs retransmission on the Msg3 information according to the selected number of times of the Msg3 retransmission, where the terminal may select the number of times of the Msg3 retransmission according to RSRP measurement. Further, if the enabling or the disabling of the Msg3 repeat transmission is indicated in the DCI indicating the PDSCH resources corresponding to the RAR or the RAR indication information, the terminal correspondingly enables or disables the repeat transmission of the Msg 3; and if the Msg3 repeated transmission parameters are indicated in the DCI indicating the PDSCH resources corresponding to the RAR or the RAR indication information, the terminal performs repeated transmission on the Msg3 according to the parameters indicated in the DCI or the RAR indication information.

Further optionally, if the configuration information includes feature RO packet information, the terminal determines the number of times of the Msg3 retransmission, selects an RO resource bearer preamble sequence in the RO packet corresponding thereto to initiate random access, and retransmits the Msg3 information according to the selected Msg3 retransmission parameter, wherein the terminal may select the number of times of the Msg3 retransmission according to RSRP measurement. Furthermore, in the DCI indicating the PDSCH resources corresponding to the RAR or the RAR indication information indicating the enabling or disabling of the Msg3 repeat transmission, the terminal enables or disables the Msg3 repeat transmission accordingly; and if the Msg3 repeated transmission parameter is indicated in the DCI or RAR indication information indicating the PDSCH resource corresponding to the RAR, the terminal performs repeated transmission on the Msg3 according to the parameter indicated in the DCI or RAR indication information.

In the embodiment of the invention, high-level semi-static Msg3 repeated transmission configuration and scheduling DCI of PDSCH corresponding to RAR and RAR indication information jointly indicate Msg3 repeated transmission parameters so as to support a cell to more flexibly schedule Msg3 repeated transmission, and simultaneously support a terminal to select Msg3 repeated transmission parameters according to self requirements, so that unnecessary Msg3 repeated transmission can be reduced, the resource utilization efficiency is improved, and the transmission reliability of Msg3 is ensured.

Fig. 2 is a flowchart of an embodiment of the method of the present application for a terminal device.

The method in any embodiment of the first aspect of the present application is applied to a terminal device, and includes the following steps 201-202:

step 201, receiving the configuration information, the DCI information, and the RAR indication information, selecting a preamble sequence and an RO resource in a random access process, determining the number of times of the Msg3 repeat transmission, and sending the selected preamble sequence.

In step 201, the configuration information includes first preamble packet information and/or RO packet information, and the terminal uniquely determines the number of times of the Msg3 retransmission according to the selected preamble sequence and RO resource.

In step 201, the information indicating the number of times of the Msg3 repeated transmission in the DCI information and the RAR indication information is not detected, and the first preamble packet information and/or the RO packet information in the configuration information is detected.

In step 201, the configuration information may be sent by the network device, or written by a protocol convention, or a combination of the two.

And step 202, sending the Msg3 information according to the determined Msg3 repeated transmission times.

In the embodiment, the number of the Msg3 repeated transmission is determined from the configuration information only through preamble sequence packets and/or RO packets, and unnecessary Msg3 repeated transmission can be reduced by implicitly informing the terminal of the selected number of the Msg3 repeated transmission through the corresponding preamble and RO.

Fig. 3 is a flowchart of another embodiment of the method of the present application for a terminal device.

The method of any one embodiment of the first aspect of the present application, applied to a terminal device, includes the following steps 301 to 302:

step 301, receiving the configuration information, the DCI information, and the RAR indication information, and determining the number of times of the Msg3 repeated transmission.

In step 301, information indicating the number of times of the Msg3 repeat transmission in the DCI information and the RAR indication information is detected.

And step 302, transmitting the Msg3 information according to the Msg3 repeated transmission times.

Fig. 4 is a flowchart of an embodiment of a method of the present application for a network device.

The method of any one embodiment of the first aspect of the present application, for a network device, includes the following steps 401 to 402:

step 401, obtaining the configuration information, receiving a detection leader sequence, and sending corresponding RAR indication information and DCI information.

In step 401, the configuration information may be determined directly in the network, or may be a protocol written to the network device.

And step 402, performing receiving detection on the Msg3 according to the number of times of repeated transmission of the Msg3 corresponding to the terminal.

Fig. 5 is a schematic diagram of an embodiment of a terminal device.

The present application further provides a terminal device, which uses the method of any one of the embodiments of the present application, and is configured to: and (4) a mobile system random access process.

In order to implement the foregoing technical solution, the present application provides a terminal device 600, which includes: a terminal receiving module 501, a terminal determining module 502 and a terminal sending module 503.

And the terminal receiving module is used for receiving the configuration information, the DCI information and the RAR indication information.

And the terminal determining module is used for determining the number of times of the Msg3 repeated transmission.

And the terminal sending module is used for sending the leader sequence and the Msg3 information.

The specific method for implementing the functions of the terminal configuration module, the terminal determination module, and the terminal sending module is as described in the method embodiments of the present application, and is not described herein again.

The terminal equipment can be mobile terminal equipment.

Fig. 6 is a schematic diagram of an embodiment of a network device.

An embodiment of the present application further provides a network device, which is configured to use the method according to any of the embodiments of the present application.

In order to implement the foregoing technical solution, a network device 600 provided in the present application includes: a network receiving module 601, a network determining module 602, and a network sending module 603.

And the network determining module is used for determining the configuration information and the number of times of Msg3 repeated transmission.

And the network receiving module is used for receiving the leader sequence and the Msg3 information.

And the network sending module is used for sending the DCI information and the RAR indication information.

The specific method for implementing the functions of the network sending module, the network receiving module, and the network determining module is described in the embodiments of the methods of the present application, and is not described herein again.

Fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention. As shown, the network device 700 includes a processor 701, a wireless interface 702, and a memory 703. Wherein the wireless interface may be a plurality of components, i.e. including a transmitter and a receiver, providing means for communicating with various other apparatus over a transmission medium. The wireless interface implements a communication function with the terminal device, and processes wireless signals through the receiving and transmitting devices, and data carried by the signals are communicated with the memory or the processor through the internal bus structure. The memory 703 contains a computer program for executing any of the embodiments of the present application, which is run or changed on the processor 701. When the memory, processor, wireless interface circuit are connected through a bus system. The bus system includes a data bus, a power bus, a control bus, and a status signal bus, which are not described herein.

Fig. 8 is a block diagram of a terminal device of another embodiment of the present invention. The terminal device 800 comprises at least one processor 801, a memory 802, a user interface 803 and at least one network interface 804. The various components in the terminal device 800 are coupled together by a bus system. A bus system is used to enable connection communication between these components. The bus system includes a data bus, a power bus, a control bus, and a status signal bus.

The user interface 803 may include a display, a keyboard, or a pointing device, such as a mouse, a trackball, a touch pad, or a touch screen, among others.

The memory 802 stores executable modules or data structures. The memory may have stored therein an operating system and an application program. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs include various application programs such as a media player, a browser, and the like for implementing various application services.

In an embodiment of the present invention, the memory 802 contains a computer program for executing any of the embodiments of the present application, and the computer program runs or changes on the processor 801.

The memory 802 contains a computer readable storage medium, and the processor 801 reads the information in the memory 802, and combines the hardware to complete the steps of the above method. In particular, the computer readable storage medium has stored thereon a computer program which, when being executed by the processor 801, carries out the steps of the method embodiments as described in any of the above embodiments.

The processor 801 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method of the present application may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 801. The processor 801 may be a general purpose processor, digital signal processor, application specific integrated circuit, off-the-shelf programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.

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

It should be noted that the terms "first", "second", and "third" in the present application are used to distinguish a plurality of objects having the same name, and have no other special meaning unless otherwise specified.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An uplink data transmission method in a random access process is characterized by comprising the following steps:

acquiring configuration information, DCI information and RAR indication information, wherein the configuration information comprises one or more Msg3 repeated transmission parameters,

if the DCI or RAR indication information contains information indicating the number of the Msg3 repeated transmission times, determining the number of the Msg3 repeated transmission times according to the DCI or RAR indication information,

different preamble packets and/or different RO resources corresponding to different Msg3 repeat transmission times; if information indicating the number of Msg3 repeated transmissions is not acquired from the DCI information and the RAR indication information, and the configuration information further comprises first leading grouping information and/or RO grouping information, determining the number of Msg3 repeated transmissions from the configuration information according to the selected leading sequence and RO resources;

according to the determined number of the Msg3 repeated transmission, the Msg3 information is transmitted repeatedly;

the Msg3 repeated transmission parameter is a public PUSCH repeated transmission parameter based on RAR scheduling, the value of the parameter corresponds to the repeated transmission times of the Msg3 information, the DCI information is DCI for scheduling PDSCH resources corresponding to the RAR, the RAR indication information is RAR corresponding to a leader sequence, the Msg3 information is a message related to a trigger random access process event in the random access process, and the RO resources are time-frequency resources for bearing the leader sequence of the random access.

2. The method of claim 1, wherein the configuration information, the DCI information, or the RAR indication information further includes Msg3 retransmission enabling information for enabling or disabling retransmission of the Msg3 message.

3. The method of claim 1, wherein each group of preamble sequences obtained by grouping the first preamble grouping information uniquely corresponds to one Msg3 retransmission times.

4. The method for uplink data transmission in a random access procedure according to claim 1, wherein the RO resources are grouped according to the RO grouping information, and each group of RO resources uniquely corresponds to one Msg3 repeat transmission times.

5. The method as claimed in claim 1, wherein if the preamble sequences for random access are grouped according to the second preamble grouping information, each group of preamble sequences grouped according to the second grouping information is further grouped according to the first preamble grouping information, and each group of preamble sequences obtained according to the first preamble grouping information uniquely corresponds to one Msg3 repeat transmission times.

6. The method of claim 1, wherein each set of preamble sequences uniquely corresponds to a first predetermined RSRP threshold range, and the selected preamble sequence is determined according to the RSRP measurement value.

7. The uplink data transmission method in the random access procedure according to claim 4, wherein the grouping of RO resources according to RO grouping information is implemented by: and providing a RO resource configuration for each group of RO resources or grouping the RO resources under the same RO resource configuration.

8. The method of claim 1, wherein each set of RO resources uniquely corresponds to a second predetermined RSRP threshold range, and wherein the selected RO resources are determined according to RSRP measurement values.

9. The method of claim 1, wherein if an active upstream BWP is selected for sending the Msg3 message, the Msg3 retransmission usage parameter is determined by configuration information on an initial upstream BWP.

10. The uplink data transmission method in the random access process according to claim 1, wherein the number of the Msg3 retransmission times is in a binding relationship with the number of the Msg1 or the MsgA PUSCH retransmission times.

11. The method according to any one of claims 1 to 10, applied to a terminal device, comprising the steps of:

receiving the configuration information, the DCI information and the RAR indication information,

if the information indicating the number of the Msg3 repeated transmission times in the DCI information and the RAR indication information is not detected, and the first preamble grouping information and/or the RO grouping information in the configuration information is detected, selecting a preamble sequence and an RO resource in a random access process, determining the number of the Msg3 repeated transmission times, and sending the selected preamble sequence;

if the information indicating the number of the Msg3 repeated transmission times in the DCI information and the RAR indication information is detected, determining the number of the Msg3 repeated transmission times;

and sending the Msg3 information according to the number of the repeated transmission of the Msg 3.

12. The method according to any one of claims 1 to 10, for a network device, comprising the steps of:

acquiring the configuration information, receiving and detecting a leader sequence, and sending corresponding RAR indication information and DCI information;

and receiving and detecting the Msg3 information according to the number of times of the repeated transmission of the Msg 3.

13. A terminal device for uplink data transmission in a random access procedure, the method as claimed in any one of claims 1 to 10, comprising:

the terminal receiving module is used for receiving the configuration information, the DCI information and the RAR indication information;

the terminal determining module is used for determining the number of times of the Msg3 repeated transmission;

14. An uplink data transmission network device in a random access process, the method according to any one of claims 1 to 10, comprising:

the network determining module is used for determining the configuration information and the number of times of Msg3 repeated transmission;

the network receiving module is used for receiving the detection leader sequence and the Msg3 information;

15. An uplink data transmission device in a random access process, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program when executed by the processor implements the steps of the method according to any one of claims 1 to 12.

16. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 12.

17. A mobile communication system comprising the apparatus of claim 13 and the apparatus of claim 14.