CN109392107B

CN109392107B - Communication method and device

Info

Publication number: CN109392107B
Application number: CN201710671308.2A
Authority: CN
Inventors: 颜矛; 黄煌; 陈磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-08
Filing date: 2017-08-08
Publication date: 2023-09-01
Anticipated expiration: 2037-08-08
Also published as: CN117241398A; CN109392107A; WO2019029498A1

Abstract

The application discloses a communication method and a device, wherein when network equipment detects that message 3 fails to be sent, the network equipment sends configuration information of a plurality of uplink resources for indicating message 3 to be retransmitted to terminal equipment, so that the terminal equipment selects one or a plurality of uplink resources from the plurality of uplink resources to retransmit at least one message 3, the probability of retransmitting the message 3 by using the same uplink resources as other terminal equipment is reduced, the probability of collision is reduced, and the time delay of random access is reduced.

Description

Communication method and device

Technical Field

The present application relates to the field of communications, and in particular, to a method and apparatus for communication.

Background

In order to improve the data rate and efficiency of wireless communication, beamforming technology is proposed in future wireless communication systems (e.g., new air interfaces), and the beamforming technology can limit the energy of a transmission signal to a certain beam direction, thereby increasing the receiving efficiency of the signal. The beam forming technology can effectively enlarge the transmission range of wireless signals and reduce signal interference, thereby achieving higher communication efficiency and obtaining higher network capacity. Beamforming techniques, while improving the efficiency of a communication network, also present challenges to beam management.

The user equipment needs to complete uplink synchronization before sending uplink service data to the network equipment. In a long term evolution (long term evolution, LTE) communication system, a random access procedure is initiated by a user equipment to complete uplink synchronization, however, in the random access process of the LTE communication system, the probability of collision of the user equipment in the process of primary transmission and retransmission of a message 3 (msg 3) is high, and the time delay of uplink synchronization is increased.

Disclosure of Invention

The technical problem to be solved by the application is to provide a communication method and a communication device, which can reduce the probability of collision of the message 3 and reduce the time delay of uplink synchronization.

In a first aspect, the present application provides a method of communication comprising: the network equipment receives the message 3 sent by the terminal equipment, and if the failure of sending the message 3 is detected, the network equipment sends configuration information of K uplink resources for indicating the retransmission of the message 3 to the terminal equipment, wherein K is an integer larger than 1.

The message 3 is a message 3 in a random access process, and the uplink resource includes at least one of a time-frequency resource, an antenna port and a reference signal. The configuration information may be notified to the terminal device by means of message 2 and/or a system message (system information, SI).

When the embodiment of the invention is implemented, the network equipment sends the configuration information of a plurality of uplink resources for indicating the retransmission of the message 3 to the terminal equipment under the condition that the network equipment detects that the message 3 is failed to be sent, so that the terminal equipment selects one or a plurality of uplink resources from the plurality of uplink resources to retransmit at least one message 3, the probability of retransmitting the message 3 by using the same uplink resources as other terminal equipment is reduced, the probability of collision is reduced, and the time delay of random access is reduced.

In one possible design, a New Radio (NR) support: the network device schedules 1 message 3 for transmission via message 2 and the network device may schedule multiple messages 3 for retransmission to reduce access latency and reduce collision probability. NR supports scheduling multiple Msg3, 3 and retransmission to reduce the access delay and the contention probability.

In one possible design, the new air interface supports: the network device schedules 1 uplink grant/uplink resource for transmission of message 3 via message 2, and the network device may schedule multiple uplink grants/uplink resources for retransmission of message 3 to reduce access latency and reduce collision probability. NR supports: gNB schedules one UL grant for Msg3 transmission by Msg, and gNB may schedule multiple UL grants for Msg3 to reduce the access delay and the contention probability.

In one possible design, the configuration information of K uplink resources is indicated by 1 downlink control information (downlink control information, DCI), and 1 DCI configures K uplink resources; or the configuration information of the K uplink resources is indicated by K DCIs, the K DCIs and the K uplink resources are in one-to-one relation, and each DCI is configured with 1 uplink resource; or the configuration information of the K uplink resources is indicated by M DCIs, wherein M is an integer greater than 1, each DCI in the M1 DCIs is configured with one uplink resource, each DCI in the M2 DCIs is configured with a plurality of uplink resources, M=M1+M2, M1 and M2 are integers greater than 0, and the sum of the number of the uplink resources configured by the M1 DCIs and the number of the uplink resources configured by the M2 DCIs is K.

In another possible design, the K DCIs are located at different frequency domain locations and/or time slots, respectively, and the M DCIs are located at different frequency domain locations or time slots, respectively.

In another possible design, the configuration information includes uplink resource quantity information and/or uplink resource location information of the retransmission message 3, where the uplink resource location information of the retransmission message 3 indicates location information time domain locations and/or frequency domain locations of the K uplink resources; the uplink resource quantity information indicates the quantity K of the uplink resources.

In another possible design, before the network device receives the message 3 sent by the terminal device, the method further includes:

the network equipment sends at least one of a system message, a message 2 and other messages to the terminal equipment; the system message or the message 2 carries uplink resource quantity information, where the uplink resource quantity information indicates the quantity of the K uplink resources.

The system message may be a remaining minimum system message (remaining minimum system information, RMSI), and the other messages may be a radio resource control (radio resource control, RRC) message, a medium access control-element (MAC-CE) message, and a physical downlink control channel order (physical down control channel order, PDCCH order).

In another possible design, before the network device sends the message 2 to the terminal device, the method further includes: the network equipment receives the random access preamble sent by the terminal, and determines the type of the random access preamble as a preset type.

Wherein, the random access preamble is divided into different types according to different actions, and the different random access preambles correspond to different types. For example: the random access preamble functions include contention-free random access mode, beam recovery, beam management, link outage recovery, and random access preamble of channel state information reference signals (channel state information reference signal, CSI-RS).

In another possible design, system message or message 2 carries DCI configuration information indicating at least one of the time-domain locations, frequency-domain locations, and number of K or M DCIs.

In a second aspect, the present application provides a method of communication comprising: the terminal equipment sends a message 3 to the network equipment, if the message 3 fails to be sent, the terminal equipment receives configuration information of K uplink resources for retransmitting the message 3 from the network equipment, K is an integer greater than 1, the terminal equipment selects N uplink resources from the K uplink resources, and retransmits the message 3 according to the N uplink resources.

Wherein, the message 3 is the message 3 in the random access process, and in the step of sending the message 3 to the network device by the terminal device, the message 3 may be initially transmitted or retransmitted. The terminal device may retransmit N messages 3 according to N uplink resources, where each uplink resource corresponds to 1 message 3. Different uplink resources can adopt Msg3 transmitted by different physical layer parameters, and the physical layer parameters comprise at least one of modulation coding mode, redundancy version, transmission power, frequency hopping mode, waveform and subcarrier interval.

By implementing the embodiment, when the terminal equipment fails to send the message 3, the terminal equipment selects one or more uplink resources from a plurality of uplink resources to retransmit one or more messages 3, so that the probability of retransmitting the message 3 by using the same uplink resources as other terminal equipment is reduced, the probability of collision is reduced, and the time delay of random access is reduced.

In one possible design, the terminal device selecting N uplink resources from the K uplink resources includes: the terminal equipment randomly selects N uplink resources from the K uplink resources; or the terminal equipment determines the quantity K and/or N of uplink resources according to the type of the random access preamble associated with the message 3; and the terminal equipment selects N uplink resources from the K uplink resources.

In one possible design, the number N of downlink resources is notified by the network device to the terminal device. The network device may notify the terminal device of at least one of message 2, downlink control information, remaining minimum system message, radio resource control message, medium access control-control element message, and physical downlink control channel instruction.

In one possible design, the terminal device determines K and/or N associated with the random access preamble based on the type of random access preamble transmitted.

In another possible design, the beam used to retransmit message 3 is different from the beam used to last transmit message 3. For example, the beam width used for retransmission of message 3 is less than the beam width used for the last transmission of message 3 (e.g., 3dB beam width is used for retransmission of message 3), and the beam direction used for retransmission of message 3 may spatially overlap with the beam direction used for the last transmission of message 3. The antenna port used for retransmitting the message 3 may also be different from the antenna port used for transmitting the message 3 last time.

In another possible design, the configuration information of the uplink resources is indicated by 1 piece of downlink control information DCI, and K uplink resources are scheduled; or (b)

The configuration information of the uplink resource is indicated by K DCIs, and each DCI configures one uplink resource; or (b)

The configuration information of the uplink resource is indicated by M DCIs; wherein M is an integer greater than 1, each DCI of M1 DCIs configured with one uplink resource, each DCI of M2 DCIs configured with a plurality of uplink resources, m=m1+m2, M1 and M2 are integers greater than or equal to 0, and the sum of the number of uplink resources configured by M1 DCIs K and the number of uplink resources configured by M2 DCIs.

In another possible design, the configuration information includes uplink resource location information and uplink resource quantity information; the uplink resource location information indicates the locations of the K uplink resources, and the uplink resource number information indicates the number of the K uplink resources.

In another possible design, before the terminal device sends the message 3 to the network device, the method further includes:

the terminal equipment receives at least one of system information, information 2 and other information which are sent by the network equipment and carry uplink resource quantity information; wherein the uplink resource number information indicates the number of uplink resources of the retransmission message 3.

The system message may be RMSI, and the other message may be at least one of an RRC message, a MAC-CE message, and a PDCCH order.

In another possible design, the method further comprises:

the terminal equipment sends a random access preamble to the network equipment; wherein the type of the random access preamble is a preset type.

In another possible design, the terminal device obtains K uplink resources from the K uplink resources for retransmission of the message 3 according to the transmitted random access preamble type, and/or selects N uplink resources from the K uplink resources for retransmission of the message 3.

In another possible design, the system message or the message 2 further carries DCI configuration information indicating at least one of a time-domain position, a number, and a frequency-domain position of the K or M DCIs.

In one possible design, the DCI configuration information is carried in DCI that has been sent to a terminal device, where the DCI configuration information is used to indicate at least one of a time-domain position, a number, and a frequency-domain position of the K or M DCIs. The DCI transmitted to the terminal device may be other DCI than K pieces of DCI or M pieces of DCI, or may belong to any one of K pieces of DCI or M pieces of DCI.

In yet another aspect, a communication apparatus is provided, which has a function of implementing the network device behavior in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible implementation manner, the apparatus includes: a receiving unit and a transmitting unit. And the receiving unit is used for receiving the message 3 sent by the terminal equipment. And the sending unit is used for sending configuration information of K uplink resources for indicating the message 3 to be retransmitted to the terminal equipment if the message 3 is detected to be failed to be sent, wherein K is an integer greater than 1.

In another possible implementation manner, the apparatus includes: a transceiver, a memory, and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

a transceiver for receiving a message 3 sent by a terminal device;

the memory stores a set of program code, and the processor is configured to invoke the program code stored in the memory to perform the following operations:

and if the message 3 is detected to be failed to be sent, the indicating transceiver sends configuration information of K uplink resources for indicating the message 3 to be retransmitted to the terminal equipment, wherein K is an integer greater than 1.

In one possible implementation, the apparatus may be a chip, and the chip may optionally include one or more memories for storing program code that, when executed, causes the processor to implement the corresponding functions.

Based on the same inventive concept, as the principle and beneficial effects of the solution of the problem of the device can be referred to the method implementation of each possible network device and the beneficial effects brought by the method implementation, the implementation of the device can be referred to the implementation of the method, and the repetition is omitted.

In yet another aspect, a communication apparatus is provided, where the apparatus has a function of implementing the behavior of the terminal device in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible implementation manner, the apparatus includes: a transmitting unit, an acquiring unit and a retransmitting unit.

A transmitting unit for transmitting a message 3 to the network device;

an obtaining unit, configured to receive, if the transmission of the message 3 fails, configuration information of K uplink resources from the network device, where the configuration information is used to instruct the message 3 to retransmit; k is an integer greater than 1;

A retransmission unit, configured to select N uplink resources from the K uplink resources, and retransmit the message 3 according to the N uplink resources; wherein N is less than or equal to K, and N is an integer greater than 0.

In another possible implementation manner, the terminal device includes: a transceiver, a memory, and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

a transceiver for sending a message 3 to a network device;

if the message 3 fails to be sent, the terminal equipment acquires configuration information of K uplink resources for indicating the message 3 to be retransmitted; k is an integer greater than 1;

selecting N uplink resources from the K uplink resources, and indicating a transceiver to retransmit the message 3 according to the N uplink resources; wherein N is less than or equal to K, and N is an integer greater than 0.

Based on the same inventive concept, as the principle and beneficial effects of the solution of the problem of the device can be referred to the method implementation of each possible terminal device and the beneficial effects brought by the method implementation, the implementation of the device can be referred to the implementation of the method, and the repetition is omitted.

Yet another aspect of the application provides a computer-readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the method of the above aspects.

Yet another aspect of the application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.

Fig. 1a is a schematic diagram of a communication system architecture according to an embodiment of the present application;

fig. 1b is a schematic diagram of a random access procedure in a long term evolution communication system;

fig. 2a is a schematic diagram of multi-beam communication in a new air interface communication system;

fig. 2b is another schematic diagram of multi-beam communication in a new air interface communication system;

FIG. 3 is a flow chart of a method of communication provided by an embodiment of the present application;

fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 5 is another schematic structural diagram of a communication device according to an embodiment of the present application;

Fig. 6 is another schematic structural diagram of a communication device according to an embodiment of the present invention;

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

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

Fig. 1a is a schematic diagram of a communication system architecture according to an embodiment of the present invention, where the communication system includes a plurality of base stations and a plurality of terminal devices. Fig. 1a shows 1a network devices communicating with 2 terminal devices. The communication system may be a global system for mobile communications (global system for mobile communication, GSM), a code division multiple access (code division multiple access, CDMA) system, a wideband code division multiple access (wideband code division multiple access, WCDMA) system, a worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) system, a long term evolution (long term evolution, LTE) system, a 5G communication system (e.g., new radio, NR)) system, a communication system in which multiple communication technologies are integrated (e.g., a communication system in which LTE technology and NR technology are integrated), or a subsequent evolution communication system. It should be noted that the number and the form of the network device and the base station device in fig. 1a are only exemplary, and are not limited to the embodiment of the present invention.

In a long term evolution communication system, the random access procedure between a terminal device and a network device is shown in fig. 1 b.

S101, the network equipment sends system information to the terminal equipment, the terminal equipment receives the system information sent by the network equipment, and the system information can carry parameters such as maximum retransmission times and the like. S102, the terminal equipment sends a random access preamble (msg 1, message 1) to the network equipment, and the network equipment receives the random access preamble sent by the terminal equipment. S103, the network equipment sends a random access response (msg 2) to the terminal equipment, and the terminal equipment receives the random access response sent by the network equipment; the random access response includes a random preamble index and an uplink scheduling grant (UL grant). S104, the terminal equipment sends a message 3 (msg 3) of the first scheduling transmission to the network equipment, and the network equipment receives the message 3 of the first scheduling transmission sent by the terminal equipment; the terminal equipment sends a scheduling transmission message 3 (msg 3) according to the time domain position and the frequency domain position indicated in the uplink scheduling grant; if the network device receives the message 3 correctly, a message 4 (msg 4) is sent to the terminal device for resolving the collision, the collision means that a plurality of users initiate a random access process by using the same uplink resource, and the network device considers that only 1 user initiates the random access. S105, the network device transmits the scheduled retransmission to the terminal device, and transmits the scheduled retransmission through DCI (downlink control information, DCI). S106, the terminal equipment schedules transmission retransmission to the network equipment. S107, the network device transmits contention resolution (msg 4, message 4) to the terminal device.

During the transmission of the message 3, the network device fails to receive the message 3 due to factors such as channel fading, interference, too low transmission power, or multiple user collisions. When the network device fails to receive the message 3, resources are rescheduled for the message 3 through the downlink control information. In the lte communication system, the network device schedules resources using the downlink control information format 0, and the structure of the downlink control information format 0 is shown in table 1. Wherein the resource scheduling field (resource block assignment and hopping resource allocation) schedules the frequency domain resources for the retransmission of message 3. The maximum retransmission times of the message 3 are indicated by the system information, and when the retransmission times of the message 3 exceed the maximum retransmission times, the terminal equipment retransmits the random access preamble or reports the random access problem to a higher layer.

In message 2, the network device will assign a temporary cell radio network temporary identity (TC-RNTI) to the terminal device for scrambling of message 3. If the network device detects that the message 3 transmission is successful and the message 4 is successful in resolving the conflict, the TC-RNTI is used as a cell radio network temporary identity (cell-radio network temporary identifier, C-RNTI) of the terminal device.

Fields	Length (number of bits)	Action
			Format identification	1	Differentiating between format 0 or format 1A
Frequency hopping indication	1	Whether or not to uplink frequency hopping
			Resource scheduling	13	Allocating uplink resources
MCS and redundancy version	5	Modulating coded information
			New data indication	1	New data indication
Power control indication	2	Power control
			Other fields	≥14	Other information transfer

TABLE 1

According to the random access procedure of the long term evolution communication system, the network equipment can reconfigure resources and power during message 3 retransmission, so that message 3 transmission failure caused by channel fading or interference can be solved, but conflict is not solved. When the collision occurs, the network device notifies the terminal device to always retransmit the message 3, resulting in a larger access delay.

Referring to fig. 2a and 2b, in the new air interface communication system, the network device and the terminal device may use multiple beams to communicate, which also has the problem of high collision probability and prolonged access. For example: as shown in fig. 2a, the same random access preamble is used by multiple terminal devices, and the multiple terminal devices receive the random access response sent by the network device and all consider to be given their own uplink scheduling grants, so that the multiple terminal devices send the message 3 on the same uplink resource, thereby causing a collision. As shown in fig. 2b, in the multi-beam scenario, when the terminal device initiates random access, in order to join quickly, a wider beam is used for communication, where the wider beam has a low antenna gain, and the network device may not be able to correctly receive the message 3, thus causing a transmission failure of the message 3.

In order to solve the problems of high collision probability and prolonged access of the retransmission of the message 3 in the current random access process, the application provides a retransmission method of the message 3, which comprises the following steps: when the network equipment detects that the transmission of the message 3 fails, a piece of downlink control information is sent to the terminal equipment to schedule a plurality of uplink resources, and the terminal equipment selects 1 or more uplink resources from the scheduled plurality of uplink resources to retransmit one or more messages 3, so that the probability of collision during retransmission of the messages 3 is reduced, and the time delay is reduced; or when the network equipment detects that the transmission of the message 3 fails, a plurality of downlink control information is sent to schedule a plurality of uplink resources, and the terminal equipment selects one or a plurality of uplink resources from the plurality of uplink resources to retransmit at least one message 3, so that the probability of collision of the retransmitted message 3 is reduced, and the time delay is reduced; or when the network equipment detects that the transmission of the message 3 fails, a plurality of uplink resources are scheduled, and the terminal equipment selects one or a plurality of uplink resources from the plurality of uplink resources to use a narrower wave beam to send one or a plurality of messages 3, sounding reference signals (sounding reference signal, SRS) and channel state information reference signals (channel state information reference signal, CSI-RS), so that the probability of successful detection of the message 3 is improved.

The terminal device in the present application is a device having a wireless communication function, and may be a handheld device, an in-vehicle device, a wearable device, a computing device, or other processing devices connected to a wireless modem, or the like. Terminal devices in different networks may be called different names, for example: a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent or user equipment, a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a terminal device in a 5G network or future evolution network, and the like.

The network device of the present application, which may also be referred to as a base station device, is a device deployed in a radio access network to provide wireless communication functions, including, but not limited to: base stations (e.g., BTS (Base Transceiver Station, BTS), node B (NodeB, NB), evolved node B (Evolutional Node B, eNB or eNodeB), transmission node or transceiver point (transmission reception point, TRP or TP) in NR system or next generation node B (gNB), base station or network equipment in future communication network), relay stations, access points, vehicle devices, wearable devices, wireless-Fidelity (Wi-Fi) sites, wireless backhaul nodes, small stations, micro stations, etc.

Referring to fig. 3, fig. 3 is a flowchart of a communication method according to an embodiment of the present invention, where the method includes, but is not limited to, the following steps:

s301, the terminal equipment sends a message 3 to the network equipment, and the network equipment receives the message 3 sent by the terminal equipment.

Specifically, the message 3 may be transmitted as initial data or as retransmitted data in this step. Before this step, the network device sends a system message to the terminal device, the terminal device sends a random access preamble (msg 1) to the network device, the network device receives the random access preamble sent by the terminal device, and the network device sends a random access response (msg 2) to the terminal device. The transmission process of the message 1 and the message 2 may be referred to the description in the lte communication system, and will not be described herein.

S302, the network equipment detects that the message 3 fails to be sent.

In one possible implementation, the network device may determine the cause of the failure of message 3 based on the signal quality and determine the number of uplink resources and/or the number of uplink resources scheduled for retransmission. For example: the signal quality is at least one of a reference signal received power (reference signal receiving power, RSRP), a reference signal received quality (reference signal receiving quality, RSRQ) and a received signal strength indication (received signal strength indication, RSSI), and the reference signal may be at least one of a channel state information reference signal (channel state information reference signal, CSI-RS), a demodulation reference signal (demodulation reference signal, DMRS), a phase tracking reference signal (phase tracking reference signal, PTRS), and a sounding reference signal (sounding reference signal, SRS). The network device detects the signal quality of the reference signal in the message 3, and when the signal quality meets a preset condition (for example, the signal quality exceeds a preset threshold) and the message 3 detection fails, the network device determines that the message 3 fails to be sent, and the message 3 is sent because of a collision (that is, multiple terminal devices send the message 3 on the same uplink resource at the same time). Optionally, the network device determines that there are multiple terminal devices that collide, and determines a number of uplink resources and/or multiple uplink resources scheduled for retransmission.

In one possible implementation, the network device schedules a plurality of uplink resources and/or the number of uplink resources for retransmission after the message 3 transmission fails according to the type of the random access preamble as a preset type. For example, when the type of the random access preamble received by the network device is a preset type, after the transmission of the message 3 fails, a plurality of uplink resources are scheduled for retransmission of the message 3. For another example, when the type of the random access preamble received by the network device does not belong to the preset type, only one uplink resource is scheduled for retransmission of the message 3 after the transmission of the message 3 fails. The method comprises the steps of presetting any one of a contention-free random access mode, beam recovery, beam management, link interruption recovery and random access preamble of a channel state information reference signal. The communication system defines the mapping relation between the index of the random access preamble and the type in advance, different random access preambles correspond to different types, and the network equipment inquires the corresponding type according to the index of the received random access preamble.

S303, the network equipment sends configuration information of K uplink resources for indicating the retransmission of the message 3 to the terminal equipment, and the terminal equipment receives the configuration information sent by the network equipment.

Specifically, the configuration information is used to represent information of K uplink resources scheduled to the message 3, for example, at least one of a time domain position, a frequency domain position, and a number of the K uplink resources. K uplink resources are used for retransmitting the message 3, K being an integer greater than 1. Among the K uplink resources of the retransmission message 3, the uplink resource includes at least one of a time domain resource, a frequency domain resource and a space resource of service data of the message 3, and also includes a resource of a reference signal of the message 3, where the reference signal may be any one of SRS, PTRS, DMRS and CSI-RS. It should be noted that the K uplink resources may be in the same time slot (slot) or in different time slots.

In one possible implementation, the configuration information of the K uplink resources is indicated by 1 DCI, and the 1 DCI configures the K uplink resources, i.e. the network device sends DCI indicating the K uplink resources for retransmission of the message 3 to the terminal device. The network device may notify configuration information of 1 DCI in this embodiment in a system message, message 2, or other DCI, where the configuration information includes at least one of the number of DCIs, a time domain location, and a frequency domain location.

In another possible implementation, the configuration information of K uplink resources is indicated by K DCIs, each of which configures 1 uplink resource. For example: k=3, the network device sends 3 DCIs, i.e., DCI1, DCI2, and DCI3, to the terminal device, and the uplink resources scheduled by the 3 DCIs are, i.e., uplink resource 1, uplink resource 2, and uplink resource 3, respectively. DCI1 indicates the time-frequency position of uplink resource 1, DCI2 indicates the time-frequency position of uplink resource 2, and DCI3 indicates the time-frequency position of uplink resource 3. The network device may notify, in the system message, the DCI sent to the terminal device in the message 2 or the K DCIs, configuration information of the K DCIs in this embodiment, where the configuration information includes at least one of the number of the K DCIs, a time domain location and a frequency domain location. Alternatively, the K DCIs may be located in different frequency domain locations and/or time slots. Alternatively, K DCIs may be located in the same frequency domain location and/or time slot and transmitted through different base station beams or antenna ports.

In another possible embodiment, the configuration information of the K uplink resources is indicated by M DCIs, M is an integer greater than 1, each of the M1 DCIs configures 1 uplink resource, each of the M2 DCIs configures a plurality of uplink resources, m=m1+m2, M1 and M2 are integers greater than 0, and a sum of a number of uplink resources configured by the M1 DCIs and a number of uplink resources configured by the M2 DCIs is equal to K. The network device may notify, among the system message, the message 2, or the DCIs that have been sent to the terminal device, configuration information of the M DCIs in this embodiment, where the configuration information includes at least one of the number of the M DCIs, a time domain location, and a frequency domain location. Alternatively, the M DCIs may be located in different frequency domain locations and/or time slots. Alternatively, the M DCIs may be located in the same frequency domain location and/or time slot and transmitted through different base station beams or antenna ports.

The network device sends M pieces of DCI for indicating the retransmission of the message 3 to the terminal device, wherein 1 uplink resource is configured for part of DCI in the M pieces of DCI, and a plurality of uplink resources are configured for the other part of DCI in the M pieces of DCI. For example: k=4, the 4 uplink resources scheduled by the network device are: uplink resource 1, uplink resource 2, uplink resource 3 and uplink resource 4, 3 DCIs sent by the network device to the terminal device, the 3 DCIs are used for scheduling 4 uplink resources, and the 3 DCIs are divided into DCI1, DCI2 and DCI3.DCI1 configures uplink resource 1, DCI2 configures uplink resource 2, DCI3 configures uplink resource 3 and uplink resource 4.

In a possible implementation manner, the configuration information of the K uplink resources may further indicate physical layer parameters on each uplink resource, where the physical layer parameters include at least one of transmission power, modulation mode, coding mode and redundancy version, and the physical layer parameters used by different uplink resources may be the same or different.

In a possible implementation manner, the configuration information of the K uplink resources may further indicate a transmission manner of the message 3 on each uplink resource, where the transmission manner includes: at least one of beam switching, precoding mode changing, demodulation reference signal (demodulation reference signal, DMRS) changing, waveform, subcarrier spacing.

In a possible implementation manner, the system message sent by the network device to the terminal device carries a resource quantity indication identifier, where the resource quantity indication identifier is used to indicate that the number of uplink resources scheduled to the retransmission of the message 3 is one or more. For example: the resource number indication flag is represented by 0 and 1, 0 representing that the number of uplink resources scheduled for retransmission of the message 3 is one, and 1 representing that the number of uplink resources scheduled for retransmission of the message 3 is a plurality. The system message includes, but is not limited to, any one of RMSI, RRC message, MAC CE, and PDCCH order.

In a possible implementation manner, the system message sent by the network device to the terminal device carries uplink resource quantity information, where the uplink resource quantity information indicates the number of K uplink resources scheduled to the message 3 for retransmission, i.e. the uplink resource quantity information indicates K. The system message includes RMSI, where the uplink resource number information may also be carried in any one of RRC message, MAC CE, and PDCCH order.

In one possible implementation manner, the message 2 sent by the network device to the terminal device carries uplink resource quantity information of uplink resources, and the message 2 is a random access response sent by the network device to the terminal device. The uplink resource number information indicates the number of K uplink resources scheduled to the message 3 for retransmission, i.e., the uplink resource number information indicates K. The system message includes RMSI, where the uplink resource number information may also be carried in any one of RRC message, MAC CE, and PDCCH order.

In one possible implementation, when the network device detects that the transmission of the message 3 fails, the network device schedules K uplink resources for retransmission for the message 3, where the number of K is greater than the number of uplink resources that were scheduled for transmission of the message 3 last time.

Illustrating: when the message 3 is transmitted for the first time, the network equipment schedules 1 uplink resource for the message 3; when the first transmission fails, the network equipment schedules K1 uplink resources for the message 3; when the second transmission fails, the network equipment schedules K2 uplink resources for the message 3; when the third transmission fails, the network equipment schedules K3 uplink resources for the message 3 until the retransmission times are equal to the maximum retransmission times or the total number of the scheduled uplink resources is equal to the maximum allowed uplink resource number; the maximum retransmission times and the maximum allowed uplink resource number can be notified to the terminal device by the network device through any one of a system message, DCI, RRC message or PDCCH order. In this embodiment, 1 < K2 < K3, where K1, K2, and K3 are integers, so that the number of uplink resources scheduled for message 3 each time is greater than the number of uplink resources scheduled for message 3 last time.

In another possible implementation, the new air interface communication system supports: the network device schedules 1 message 3 for transmission via message 2 and the network device may schedule multiple messages 3 for retransmission to reduce access latency and reduce collision probability. NR supports scheduling multiple Msg3, 3 and retransmission to reduce the access delay and contention probability.

In one possible way, the network device assigns a new C-RNTI (different from the TC-RNTI in message 2) and/or TA (time advance) to the corresponding terminal device in the respective message 4; the terminal device determines that the collision resolution was successful based on the content of message 4 (contention resolution successful), uses the C-RNTI in the currently received message 4, and discards the TC-RNTI. Optionally, the network device does not assign a new C-RNTI to the message 4 corresponding to one of the messages 3, and the user device (transmitting the message 3) sets the TC-RNTI to the C-RNTI after receiving the message 4 and completing the collision resolution.

In another possible implementation, the new air interface communication system supports: the network device schedules 1 uplink grant for transmission of message 2 via message 2 and the network device may schedule multiple uplink grants for retransmission of message 3 to reduce access latency and reduce collision probability.

S304, the terminal equipment selects N uplink resources from the K uplink resources.

The terminal equipment receives configuration information from the network equipment for indicating retransmission of the message 3, and determines information of K uplink resources according to the configuration information. Wherein, the configuration information may be 1 or more DCIs transmitted by the network device. The terminal equipment selects N uplink resources from K uplink resources according to a prestored or preconfigured selection rule, wherein N is less than or equal to K and N is an integer. The network device may inform the terminal device of the selection rule through at least one of a system message, message 2, and DCI.

In one possible implementation, the terminal device may obtain N from at least one of message 2, DCI, RMSI, RRC message, MAC-CE message, and PDCCH order.

In one possible design, the terminal device pre-stores or pre-configures a mapping relationship between the type of the random access preamble and the number of the selected uplink resources, and determines the number N and/or K of the uplink resources according to the type of the random access preamble, and selects N uplink resources from the K uplink resources.

For example, the random access preamble 1 is a dedicated preamble when the link is interrupted, and the number of the random access preamble 1 associations is 1; the random access preamble 2 is a dedicated preamble used in beam management, and the number of association of the random access preamble 2 is 2. Assuming that the number of uplink resources indicated by the configuration information is 4, when the transmission of the message 3 fails, the terminal equipment determines that the message 3 corresponds to the random access preamble 1, determines that the number associated with the random access preamble 1 is 1 according to a pre-stored or pre-configured mapping relation, and selects 1 uplink resource from the 4 uplink resources for retransmitting the message 3. When the transmission of the message 3 fails, the terminal equipment determines that the message 3 corresponds to the random access preamble 2, determines that the association number of the random access preamble 2 is 2 according to a pre-stored or pre-configured mapping relation, and selects 2 uplink resources from 4 uplink resources for retransmitting the message 3.

It should be noted that the types, the numbers, and the mapping relationships of the random access preambles described above are merely exemplary descriptions, and are not limiting to the present embodiment.

In another possible implementation, the selection rule is: the terminal equipment randomly selects N uplink resources from the K uplink resources.

The probability that each uplink resource in the K uplink resources is selected is equal, and the terminal equipment randomly selects N uplink resources from the K uplink resources, namely, the terminal equipment selects N uplink resources from the K uplink resources with equal probability.

It should be noted that, after the first message 3 transmission failure, the terminal device may retransmit the message 3 multiple times, where the number of times of retransmitting the message 3 must be smaller than the maximum number of times of retransmission, and the network device may notify the terminal device of the maximum number of times of retransmission through any one of the system message, the message 2, the DCI, the RRC message or the PDCCH order. The network device schedules uplink resources for each retransmission of message 3. Alternatively, the number of uplink resources scheduled for the message 3 per retransmission may be in an increasing or non-decreasing relationship with the number of retransmissions, and the terminal device needs to select at least one uplink resource for retransmitting the message 3 from the plurality of uplink resources scheduled by the network device each time. The selection rules and the number of the uplink resources selected by the network device each time may be the same or different, which is not limited in this embodiment.

S305, the terminal equipment retransmits the message 3 to the network equipment, and the network equipment receives the message 3 retransmitted by the terminal equipment.

The terminal device retransmits the message 3 to the network device according to the N uplink resources selected in S204. The number of messages 3 retransmitted by the terminal device may be N, i.e. 1 message 3 is retransmitted per uplink resource. The terminal device may send N messages 3 with N sending beams and/or antenna ports according to the indication of the configuration information sent by the network device, each sending beam and/or antenna port sends 1 message 3, at least one of SRS, DMRS, PTRS and CSI-RS may be carried in each sent message 3, and SRS, DMRS, PTRS and/or CSI-RS carried in each message 3 may be the same or different. In further implementations, the terminal device may send N messages 3 in the same manner (e.g., transmit beam/antenna ports) as indicated by the configuration information sent by the network device. Alternatively, the base station receives N messages 3 using different receive beams.

When a plurality of terminal devices collide, the network device schedules a plurality of uplink resources for the message 3, and uplink resources selected by each terminal device that collides may be different, so that the network device can detect the message 3 on different uplink resources, and the probability of collision is reduced. And after receiving the retransmitted message 3, the network equipment sends a message 4 to the terminal equipment.

It should be noted that, the apparatus 4 shown in fig. 4 may implement the network device side of the embodiment shown in fig. 3, where the apparatus 4 includes a receiving unit 401 and a transmitting unit 402. A receiving unit 401, configured to receive a message 3 sent by a terminal device, for example: the receiving unit 401 performs the step of S301 in fig. 3. A sending unit 402, configured to send, to the terminal device, configuration information of K uplink resources for indicating retransmission of the message 3 if the message 3 is detected to be failed to be sent, where M is an integer greater than 1, for example: the transmitting unit performs the steps of S302 and S303 in fig. 3. The apparatus 4 may be a network device, and the apparatus 4 may also be a field-programmable gate array (FPGA) for implementing related functions, an application specific integrated chip, a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit, a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chips.

The embodiment of the present invention and the embodiment of the method of fig. 3 are based on the same concept, and the technical effects brought by the embodiments are the same, and the specific process can refer to the description of the embodiment of the method of fig. 3, which is not repeated here.

As shown in fig. 5, the embodiment of the present invention further provides an apparatus 5.

In one possible design, the apparatus 5 is a network device comprising:

a memory 503 for storing programs and data. The number of memories may be one or more, and the type of memory may be any form of storage medium. For example: the memory may be a random access memory (random access memory, abbreviated as RAM) or a Read Only Memory (ROM) or a flash memory, where the memory 503 may be located in the terminal device alone or in the processor 501.

A transceiver 502 for receiving and transmitting signals. The transceiver may be implemented as a separate chip, as a transceiver circuit within the processor 501, or as an input-output interface. The transceiver may be at least one of a transmitter for performing a transmitting step in the apparatus and a receiver for performing a receiving step in the apparatus. Alternatively, the transceiver 502 may further include a transmitting antenna and a receiving antenna, where the transmitting antenna and the receiving antenna may be two antennas separately provided, or may be one antenna. A transceiver 502 for receiving the message 3 sent by the terminal device. For example: the transceiver 502 is used to perform the step S301 in fig. 3.

A processor 501, configured to execute the program code stored in the memory 503, where when the program code is executed, the processor 501 is configured to instruct the transceiver 502 to send configuration information for instructing K uplink resources for retransmitting the message 3 to the terminal device if the transmission failure of the message 3 is detected, where K is an integer greater than 1. For example: the processor 501 is configured to perform the steps of S302 and S303 in fig. 3.

The transceiver 502, the memory 503, and the processor 501 communicate with each other through an internal connection path, for example: connected by a bus.

In different embodiments, the configuration information of the uplink resource is indicated by 1 downlink control information DCI; or (b)

The configuration information of the uplink resource is indicated by M DCIs; wherein M is an integer greater than 1, each DCI of M1 DCIs configured with an uplink resource, each DCI of M2 DCIs configured with a plurality of uplink resources, m=m1+m2, M1 and M2 are integers greater than 0, and the sum of the number of uplink resources configured by M1 DCIs and the number of uplink resources configured by M2 DCIs K.

In different embodiments, the K DCIs are located at different frequency domain locations and/or time slots, and the M DCIs are located at different frequency domain locations and/or time slots.

In a different embodiment, the configuration information includes uplink resource location information and/or uplink resource number information, where the uplink resource location information indicates a time domain location and/or a frequency domain location of the K uplink resources, and the uplink resource number information indicates the number of the K uplink resources.

In various embodiments, the transceiver is further configured to send at least one of a system message SI, a message 2, a radio resource control RRC message, a medium access control-control element MAC-CE message, and a physical downlink control channel instruction PDCCH order to the terminal device; at least one of the system message SI, the message 2, the radio resource control RRC message, the medium access control-control element MAC-CE message, and the physical downlink control channel instruction PDCCH order carries uplink resource number information, where the uplink resource number information indicates the number of the K uplink resources.

In a different embodiment, characterized in that,

a transceiver 502, configured to receive a random access preamble sent by the terminal device;

the processor 501 is further configured to determine that the type of the random access preamble is a preset type.

In a different embodiment, the system message or the message 2 further carries DCI configuration information indicating at least one of time domain positions, number and frequency domain positions of the K or M DCIs.

In one possible design, the device 5 may be a chip, for example: may be a communication chip for use in a network device for implementing the relevant functions of the processor 501 in the network device. The chip can be a field programmable gate array for realizing related functions, an application specific integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, a programmable controller or other integrated chips. The chip may optionally include one or more memories for storing program code that, when executed, causes the processor to perform the corresponding functions.

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

It should be noted that, the apparatus 6 shown in fig. 6 may implement the terminal device side in the embodiment shown in fig. 3, where the apparatus 6 includes: a transmitting unit 601, an acquiring unit 602, and a retransmitting unit 603. Wherein, the sending unit 601 is configured to send the message 3 to the network device. An obtaining unit 602, configured to receive, if the transmission of the message 3 fails, configuration information of K uplink resources from a network device, where the configuration information is used to instruct the message 3 to retransmit; k is an integer greater than 1. A retransmission unit 603, configured to select N uplink resources from the K uplink resources, and retransmit the message 3 according to the N uplink resources; wherein N is less than or equal to K, and N is an integer greater than 0. The device 6 may be a terminal device, and the device 6 may also be a field-programmable gate array (FPGA) for implementing related functions, an application specific integrated chip, a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit, a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chips.

As shown in fig. 7, the embodiment of the invention also provides a device 7.

In one possible design, the apparatus 7 is a terminal device comprising:

a memory 703 for storing programs and data. The number of memories may be one or more, and the type of memory may be any form of storage medium. For example: the memory may be a random access memory (random access memory, abbreviated as RAM) or a Read Only Memory (ROM) or a flash memory, where the memory 703 may be located in the terminal device alone or in the processor 701.

A transceiver 702 for receiving and transmitting signals. The transceiver may be implemented as a separate chip, as a transceiver circuit within the processor 701, or as an input-output interface. The transceiver may be at least one of a transmitter for performing a transmitting step in the apparatus and a receiver for performing a receiving step in the apparatus.

Alternatively, the transceiver 702 may further include a transmitting antenna and a receiving antenna, which may be two antennas separately provided or may be one antenna. A transceiver 702 for transmitting message 3 to a network device. For example: the transceiver 702 is configured to perform the step of S303 in fig. 3.

A processor 701 for executing the program code stored in the memory 703, wherein when the program code is executed, the processor 701 is configured to obtain configuration information of K uplink resources for indicating retransmission of the message 3 if the message 3 fails to be sent; k is an integer greater than 1;

selecting N uplink resources from the K uplink resources, and indicating the transceiver to retransmit the message 3 according to the N uplink resources; wherein N is less than or equal to K and N is an integer greater than 0. For example: the processor 701 is configured to perform the steps of S304 and S305 in fig. 3.

The transceiver 702, the memory 703 and the processor 701 communicate with each other through internal connection paths, for example: connected by a bus.

In one possible design, the device 7 may be a chip, for example: may be a communication chip for use in a network device for implementing the relevant functions of the processor 701 in the network device. The chip can be a field programmable gate array for realizing related functions, an application specific integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, a programmable controller or other integrated chips. The chip may optionally include one or more memories for storing program code that, when executed, causes the processor to perform the corresponding functions.

The embodiment of the present application and the embodiment of the method of fig. 2a are based on the same concept, and the technical effects brought by the same concept, and the specific process can refer to the description of the embodiment of the method of fig. 2a, which is not repeated here.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

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

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

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

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

Those of ordinary skill in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by a computer program to instruct related hardware, the program may be stored in a computer readable storage medium, and the program may include the above-described method embodiments when executed. And the aforementioned storage medium includes: ROM or random access memory RAM, magnetic or optical disk, etc.

Claims

1. A method of communication, comprising:

the terminal equipment sends a random access preamble to the network equipment;

the terminal equipment receives a random access response sent by the network equipment;

the terminal equipment sends a message 3 to the network equipment;

if the message 3 fails to be sent and the type of the random access preamble belongs to a preset type, the terminal equipment receives configuration information of K uplink resources from the network equipment, wherein the K is an integer greater than 1, the configuration information of the K uplink resources is indicated by downlink control information DCI, and the preset type corresponds to the effect of the random access preamble;

The terminal equipment selects N uplink resources from the K uplink resources according to a prestored or preconfigured selection rule, and retransmits the message 3 according to the N uplink resources; wherein N is less than or equal to K and N is an integer greater than 0.

2. The method of claim 1, wherein before the terminal device sends message 3 to the network device, further comprising:

in the case that the message 3 is transmitted for the first time, the terminal device receives configuration information of 1 uplink resource, which is initially transmitted by the network device indication message 3;

the terminal device sends a message 3 to the network device, including:

and the terminal equipment sends the message 3 to the network equipment on the 1 uplink resource.

3. The method of claim 1, wherein configuration information of the K uplink resources is indicated by 1 downlink control information DCI; or (b)

The configuration information of the K uplink resources is indicated by K DCIs, and each DCI configures one uplink resource; or (b)

The configuration information of the K uplink resources is indicated by M DCIs; wherein M is an integer greater than 1, each DCI of M1 DCIs configured with an uplink resource, each DCI of M2 DCIs configured with a plurality of uplink resources, m=m1+m2, M1 and M2 are integers greater than 0, and the sum of the number of uplink resources configured by M1 DCIs and the number of uplink resources configured by M2 DCIs K.

4. A method according to any of claims 1-3, wherein the configuration information of the K uplink resources comprises uplink resource location information indicating time domain locations and/or frequency domain locations of the K uplink resources and/or uplink resource number information indicating the number of the K uplink resources.

5. A method according to any of claims 1-3, characterized in that before the terminal device sends message 3 to the network device, it further comprises:

the terminal equipment receives at least one of system information SI, information 2, radio resource control RRC information, media access control-control element MAC-CE information and physical downlink control channel instruction PDCCH order sent by the network equipment; at least one of the system message SI, the message 2, the radio resource control RRC message, the medium access control-control element MAC-CE message, and the physical downlink control channel instruction PDCCH order carries uplink resource quantity information.

6. A method according to any of claims 1-3, wherein said retransmitting said message 3 according to N uplink resources comprises:

and retransmitting the message 3 by adopting different redundancy versions on the N uplink resources respectively.

7. The method of claim 1, wherein the method further comprises:

and the terminal equipment determines the number N and/or K of uplink resources according to the type of the random access preamble associated with the message 3.

8. A method according to any of claims 1-3, characterized in that the beam used for retransmitting the message 3 is different from the beam used for the last transmission of the message 3; or (b)

The antenna port used for retransmitting the message 3 is not identical to the antenna port used for the last transmission of the message 3.

9. A method of communication, comprising:

the network equipment receives a random access preamble sent by the terminal equipment;

the network equipment sends a random access response to the terminal equipment;

the network equipment receives the message 3 sent by the terminal equipment;

if the message 3 is detected to be failed to be sent and the type of the random access preamble belongs to a preset type, the network device sends configuration information of K uplink resources for indicating the message 3 to be retransmitted to the terminal device, K is an integer greater than 1, the configuration information of the K uplink resources is indicated by downlink control information DCI, and the preset type corresponds to the effect of the random access preamble.

10. The method of claim 9, wherein before the network device receives the message 3 sent by the terminal device, further comprising:

and under the condition that the message 3 is transmitted for the first time, the network equipment sends configuration information of 1 uplink resource for indicating the message 3 to be transmitted for the first time to the terminal equipment.

11. The method of claim 9, wherein,

the configuration information of the K uplink resources is indicated by 1 downlink control information DCI; or (b)

12. The method according to any of claims 9-11, wherein the configuration information of the K uplink resources comprises uplink resource location information indicating time domain locations and/or frequency domain locations of the K uplink resources and/or uplink resource number information indicating the number of the K uplink resources.

13. The method according to any of claims 9-11, wherein before the network device receives the message 3 sent by the terminal device, further comprising:

the network equipment sends at least one of a system message SI, a message 2, a radio resource control RRC message, a media access control-control element MAC-CE message and a physical downlink control channel instruction PDCCH order to the terminal equipment; at least one of the system message SI, the message 2, the radio resource control RRC message, the medium access control-control element MAC-CE message, and the physical downlink control channel instruction PDCCH order carries uplink resource quantity information.

14. An apparatus for communication, comprising: a processor and a transceiver;

the transceiver is configured to send a random access preamble to a network device;

the transceiver is further configured to receive a random access response sent by the network device;

the transceiver is further configured to send a message 3 to a network device;

the transceiver is further configured to receive configuration information of K uplink resources from the network device, where the configuration information is used to instruct the message 3 to retransmit if the message 3 fails to be sent and the type of the random access preamble belongs to a preset type; k is an integer greater than 1, configuration information of the K uplink resources is indicated by downlink control information DCI, and the preset type corresponds to the effect of the random access preamble;

The processor is used for selecting N uplink resources from the K uplink resources according to a prestored or preconfigured selection rule;

the transceiver is further configured to retransmit the message 3 according to N uplink resources; wherein N is less than or equal to K and N is an integer greater than 0.

15. The apparatus of claim 14, wherein the transceiver is further configured to receive configuration information for 1 uplink resource for initial transmission of the network device indication message 3;

the transceiver sends a message 3 to the network device, specifically including: and sending the message 3 to the network equipment on the 1 uplink resource.

16. The apparatus of claim 14, wherein configuration information of the K uplink resources is indicated by 1 downlink control information, DCI; or (b)

17. The apparatus according to any of claims 14-16, wherein the configuration information of the K uplink resources comprises uplink resource location information indicating time domain locations and/or frequency domain locations of the K uplink resources and/or uplink resource number information indicating the number of the K uplink resources.

18. The apparatus according to any of claims 14-16, wherein the transceiver is further configured to receive at least one of a system message SI, a message 2, a radio resource control, RRC, message, a medium access control, MAC, CE, message, and a physical downlink control channel, PDCCH order, sent by the network device; at least one of the system message SI, the message 2, the radio resource control RRC message, the medium access control-control element MAC-CE message, and the physical downlink control channel instruction PDCCH order carries uplink resource quantity information.

19. The apparatus according to any of claims 14-16, wherein the transceiver retransmits the message 3 according to N uplink resources, specifically comprising:

20. The apparatus of claim 14, wherein the processor is further configured to determine the number of uplink resources N and/or K based on a type of random access preamble associated with the message 3.

21. The apparatus according to any of claims 14 to 16, wherein the beam used for retransmitting the message 3 is different from the beam used for the last transmission of the message 3; or (b)

The antenna port used for retransmitting the message 3 is different from the antenna port used for transmitting the message 3 last time.

22. A communication device, comprising: a transceiver and a processor;

the transceiver is used for receiving a random access preamble sent by the terminal equipment;

the transceiver is configured to send a random access response to the terminal device;

the transceiver is used for receiving a message 3 sent by the terminal equipment;

the transceiver is configured to send, to the terminal device, configuration information of K uplink resources for indicating retransmission of the message 3 if the processor detects that the message 3 fails to be sent and the type of the random access preamble belongs to a preset type, where K is an integer greater than 1, the configuration information of the K uplink resources is indicated by downlink control information DCI, and the preset type corresponds to an effect of the random access preamble.

23. The apparatus of claim 22, wherein the transceiver is further configured to send configuration information for 1 uplink resource indicating that the message 3 was initially transmitted to the terminal device if the message 3 is a first transmission.

24. The apparatus of claim 22, wherein the device comprises a plurality of sensors,

25. The apparatus according to any of claims 22-24, wherein the configuration information of the K uplink resources comprises uplink resource location information indicating time domain locations and/or frequency domain locations of the K uplink resources and/or uplink resource number information indicating the number of the K uplink resources.

26. The apparatus according to any of claims 22-24, wherein the transceiver is further configured to send at least one of a system message SI, a message 2, a radio resource control, RRC, message, a medium access control, MAC, CE, message, and a physical downlink control channel, PDCCH order to the terminal device; at least one of the system message SI, the message 2, the radio resource control RRC message, the medium access control-control element MAC-CE message, and the physical downlink control channel instruction PDCCH order carries uplink resource quantity information.

27. A communication system, characterized in that the communication system comprises a terminal device for performing the method according to any of claims 1-8 and a network device for performing the method according to any of claims 9-13.

28. A communication device, comprising: a processor, which when calling a computer program or instructions in memory, is adapted to perform the method of any of claims 1 to 8 or 9 to 13.

29. A computer readable storage medium storing a computer program or instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 8 or 9 to 13.