CN110475374B

CN110475374B - Communication method and communication device

Info

Publication number: CN110475374B
Application number: CN201810449669.7A
Authority: CN
Inventors: 邵华; 黄煌; 高宽栋
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-05-11
Filing date: 2018-05-11
Publication date: 2024-03-19
Anticipated expiration: 2038-05-11
Also published as: CN110475374A

Abstract

The application provides a communication method and communication equipment, wherein the method comprises the following steps: the terminal equipment determines a first random access parameter, wherein the first random access parameter comprises the repeated sending times of a random access process message III and/or a first expansion factor, and the first expansion factor is the expansion factor of a transmission block corresponding to the random access process message III; and the terminal equipment sends the random access procedure message III to the network equipment according to the first random access parameter. The communication method of the embodiment of the application is beneficial to improving the uplink coverage performance of the random access process message III.

Description

Communication method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

In long term evolution (Long Term Evolution, LTE), a terminal device may achieve the following purpose through a Random Access (RA) procedure: uplink synchronization is obtained, and a unique identity C-RNTI (Cell Radio Network Temporary Identifier, cell radio network temporary identity) is obtained.

There are 2 different ways of random access procedure: in a Contention-based manner, the terminal device solves the problem of Contention between different terminal devices by carrying identification information for performing collision resolution in a random access procedure message 3 (Msg 3) based on Contention (CBRA) and based on Non-Contention (CFRA).

Typically, the transmit power of the terminal device is less than the transmit power of the network device. Especially for the terminal device at the cell edge, it may happen that the random access procedure message two (Msg 2) sent by the network device can be received, but Msg3 cannot be sent successfully. Meanwhile, in LTE, the number of adaptive retransmissions of Msg3 defined in the protocol is smaller than that of the normal physical uplink shared channel (Physical Uplink Shared Channel, PUSCH), so that uplink coverage performance of Msg3 is poor.

Disclosure of Invention

In view of this, the present application provides a communication method and a communication device, so as to improve uplink coverage performance of a random access procedure message three (Msg 3).

In a first aspect, a communication method is provided, the method comprising:

the terminal equipment determines a first random access parameter, wherein the first random access parameter comprises the repeated sending times of a random access process message III and/or a first expansion factor, and the first expansion factor is the expansion factor of a transmission block corresponding to the random access process message III;

and the terminal equipment sends the random access procedure message III to the network equipment according to the first random access parameter.

In some possible implementations, the first random access parameter includes a number of repeated transmissions of the random access procedure message three, and the terminal device transmits the random access procedure message three to the network device according to the first random access parameter, including:

The terminal device repeatedly sends the random access procedure message III to the network device.

Therefore, the communication method according to the embodiment of the present application helps to improve uplink coverage performance of Msg3 by repeatedly transmitting Msg 3.

In some possible implementations, the first random access parameter includes the first scaling factor, and the terminal device sends the random access procedure message three to the network device according to the first random access parameter, including:

the terminal device sends the random access procedure message three to the network device using the first scaling factor.

Therefore, by configuring the transport block extension factor corresponding to the Msg3, the communication method of the embodiment of the present application reduces the code rate of the Msg3 without changing the modulation coding mode, and is beneficial to improving the uplink coverage performance of the Msg 3.

In some possible implementations, the first random access parameter includes a number of repeated transmissions of a random access procedure message three and the first scaling factor, and the terminal device sends the random access procedure message three to the network device according to the first random access parameter, including:

and the terminal equipment repeatedly sends the random access procedure message III to the network equipment by using the first expansion factor.

With reference to the first aspect, in certain possible implementation manners of the first aspect, the method further includes:

the terminal equipment receives a second random access process message sent by the network equipment, wherein the second random access process message comprises a second random access parameter, the second random access parameter comprises a timing advance and/or a power control parameter, and the second random access parameter is associated with the first random access parameter;

wherein the determining, by the terminal device, the first random access parameter includes:

the terminal equipment determines the first random access parameter according to the second random access parameter.

In some possible implementations, the method further includes:

the terminal equipment receives a second random access procedure message sent by the network equipment and indication information, wherein the second random access procedure message comprises a second random access parameter, the second random access parameter comprises a timing advance and/or a power control parameter, the second random access parameter is associated with a repeated sending number set and/or a telescopic factor set, the indication information is used for indicating the repeated sending number of the third random access procedure message in the repeated sending number set, and/or the indication information is used for indicating the first telescopic factor in the telescopic factor;

the terminal equipment determines the first random access parameter according to the second random access parameter and the indication information.

In some possible implementations, the set of repeated transmission times includes a plurality of repeated transmission times values, and the set of scaling factors includes a plurality of scaling factors.

the terminal equipment sends a random access procedure message I to the network equipment, wherein the format of the random access procedure message I is associated with the first random access parameter;

the terminal equipment determines the first random access parameter according to the format of the first random access procedure message.

In some possible implementations, the method further includes:

the terminal equipment sends a random access procedure message I to the network equipment, wherein the format of the random access procedure message I is associated with a repeated sending times set and/or a telescopic factor set, the indication information is used for indicating the repeated sending times of the random access procedure message III in the repeated sending times set, and/or the indication information is used for indicating the first telescopic factor in the telescopic factor;

the terminal equipment determines the first random access parameter according to the format of the first random access procedure message and the indication information.

the terminal equipment receives a random access process message II sent by the network equipment;

and the terminal equipment determines the first expansion factor according to a second expansion factor, wherein the second expansion factor is the expansion factor of the transmission block corresponding to the second random access process message.

In some possible implementations, the method further includes:

the terminal equipment receives a random access process message II and indication information sent by the network equipment;

and the terminal equipment determines the first expansion factor from an expansion factor set corresponding to the second expansion factor according to the second expansion factor and the indication information, wherein the second expansion factor is the expansion factor of the transmission block corresponding to the random access procedure message II.

In some possible implementations, the set of scaling factors includes a plurality of scaling factors.

With reference to the first aspect, in certain possible implementations of the first aspect, the first scaling factor is less than or equal to the second scaling factor.

and determining the time domain position of the repeated transmission and the HARQ retransmission period of the hybrid automatic repeat request, wherein K is the number of repeated transmission, and K is a positive integer greater than or equal to 1, and the time of the repeated transmission is less than one HARQ retransmission period.

In some possible implementations, the time domain locations of the K repeated transmissions are adjacent in time.

In some possible implementations, the time domain locations of the K repeated transmissions are not adjacent in time.

In some possible implementations, the time domain locations of the K repeated transmissions are predefined or configured for the network device.

In some possible implementations, the time domain position of the K repeated transmissions is an Uplink (UL) or Flexible (or X) portion in a semi-static uplink-downlink configuration period indicated in a remaining minimum system message (RMSI) of the network device configuration

In some possible implementations, the network device configures two semi-static configuration periods X and Y, where the time domain position of the K repeated transmissions is min (X, Y), or max (X, Y), or an Uplink (UL) or Flexible (X) portion in integer multiples of (x+y).

In some possible implementations, the HARQ retransmission period is predefined; alternatively, the HARQ retransmission period is configured for the network device.

In some possible implementations, the HARQ retransmission period is an integer multiple of a semi-static uplink and downlink configuration period indicated in a remaining minimum system message (RMSI) of the network device configuration.

In some possible implementations, the network device is configured with two semi-static configuration periods X and Y, the HARQ retransmission period being an integer multiple of min (X, Y), or, max (X, Y), or (x+y).

It should be appreciated that the K repeated transmissions are less in time than the HARQ retransmission period.

and receiving first indication information sent by the network equipment, wherein the first indication information is used for indicating an offset value of the time domain position of the K repeated transmissions in the HARQ period.

With reference to the first aspect, in certain possible implementation manners of the first aspect, the time domain position of the K repeated transmissions includes a time slot position of each transmission in the K repeated transmissions, and the method further includes:

in the slot position of each transmission, the symbol position of each transmission is determined.

With reference to the first aspect, in some possible implementation manners of the first aspect, the time domain position of the nth retransmission in the K number of repeated transmissions conflicts with the time domain position of the received downlink signal or the high priority signal, or the time domain position of the nth retransmission does not conflict with the time domain position of the received downlink signal or the high priority signal, but a time interval between the nth retransmission and the time domain position of the received downlink signal or the high priority signal is insufficient as a guard interval (for example, the guard interval includes a terminal device processing time, and/or an uplink/downlink switching time, etc.), where N is a positive integer greater than or equal to 1 and less than or equal to K, and the method further includes:

the nth repeat transmission is skipped.

In some possible implementations, the downlink signal may include one or more of a downlink synchronization signal block (SS/PBCH block), remaining minimum system information (Remaining Minimum System Information, RMSI), a set of control resources (Control Resource Set, CORESET), a downlink signal (DL) in Semi-static DL/UL, and/or Flexible (Flexible) portions.

In some possible implementations, the high priority signal may include one or more of a physical random access channel (Physical Random Access Channel, PRACH), a physical uplink control channel (Physical Uplink Control Channel, PUCCH), an uplink sounding reference signal (Sounding Reference Signal, SRS), and a Reserved resource (Reserved).

In some possible implementations, the method further includes:

after skipping the nth repeated transmission, the terminal device continues to transmit the random access procedure message three at the next available time domain position.

In some possible implementations, the terminal device continues to send Msg3 on the next available uplink resource.

In some possible implementations, the available uplink resources may be part of Uplink (UL) and/or Flexible (Flexible) and the available uplink resources do not collide with downlink signals or high priority resources, while the uplink resources are time-spaced from a previous downlink signal by a guard interval (e.g., the guard interval includes terminal device processing time, and/or uplink-downlink switching time, etc.).

In some possible implementations, the terminal device continues to transmit the random access procedure message three on the next available uplink slot.

and after the K times of repeated transmission are finished, the random access procedure message III is transmitted once again.

In some possible implementations, the terminal device skips M repeated transmissions in the K repeated transmissions, where M is a positive integer greater than or equal to 1 and less than or equal to K, and the method further includes:

after the K repeated transmissions, M more random access procedure messages three are transmitted.

receiving second indication information sent by the network equipment, wherein the second indication information is used for indicating that the random access process message III is successfully received;

and stopping sending the random access procedure message III according to the second indication information.

According to the communication method, after the network equipment successfully receives the Msg3, the indication information of successful reception is sent to the terminal equipment, so that resource waste is avoided, and uplink transmission delay is reduced.

In a second aspect, a communication method is provided, the method comprising:

the network equipment determines a first random access parameter, wherein the first random access parameter comprises the repeated sending times of a random access process message III and/or a first expansion factor, and the first expansion factor is the expansion factor of a transmission block corresponding to the random access process message III;

The network equipment receiving terminal equipment sends the random access procedure message III according to the first random access parameter.

With reference to the second aspect, in certain possible implementations of the second aspect, the method further includes:

the network equipment receives a random access procedure message I sent by the terminal equipment;

the network equipment determines a second random access parameter according to the first random access procedure message, wherein the second random access parameter comprises a timing advance and/or a power control parameter, and the second random access parameter is associated with the first random access parameter;

wherein the network device determines a first random access parameter comprising:

the network device determines the first random access parameter according to the second random access parameter.

In some possible implementations, the method further includes:

the network equipment determines a second random access parameter according to the first random access procedure message, wherein the second random access parameter comprises a timing advance and/or a power control parameter, and the second random access parameter is associated with a repeated transmission frequency set and/or a telescopic factor set;

The network device sends indication information to the terminal device, where the indication information is used to indicate the number of repeated sending of the third message in the random access procedure in the set of repeated sending times, and/or the indication information is used to indicate the first scaling factor in the set of scaling factors.

the network device determines the first random access parameter according to the second random access parameter and the indication information.

the network equipment receives a random access procedure message I sent by the terminal equipment, and the format of the random access procedure message I is associated with the first random access parameter;

the network device determines the first random access parameter according to the format of the random access procedure message one.

In some possible implementations, the method further includes:

the network equipment receives a random access process message I and indication information sent by the terminal equipment, wherein the format repeated sending times set and/or the telescopic factor set of the random access process message I are associated, the indication information is used for indicating the repeated sending times of the third message of the random access process in the repeated sending times set, and/or the indication information is used for indicating a first telescopic factor in the telescopic factor set;

the network device determines the first random access parameter according to the format of the random access procedure message I and the indication information.

the network equipment determines a second expansion factor according to the first random access process message, wherein the second expansion factor is an expansion factor of a transmission block corresponding to the second random access process message;

the network device determines the first scaling factor based on the second scaling factor.

With reference to the second aspect, in some possible implementations of the second aspect, the first scaling factor is less than or equal to the second scaling factor.

In a third aspect, a communication method is provided, the method comprising:

the terminal equipment determines that the repeated sending times of the random access process message III is K, wherein K is a positive integer which is more than or equal to 1;

the terminal equipment repeatedly sends the random access process message III to the network equipment for K times;

In the case where the time domain position of the nth repetition transmission among the K repetition transmissions collides with the time domain position of the received downlink signal or the high priority signal, or the time domain position of the nth repetition transmission does not collide with the time domain position of the received downlink signal or the high priority signal, but the time interval with the reception of the previous downlink signal or the high priority signal is insufficient as a guard interval (for example, the guard interval includes a terminal device processing time, and/or an uplink/downlink switching time, etc.), the nth repetition transmission is skipped, N being a positive integer of 1 or more and K or less.

With reference to the third aspect, in some possible implementations of the third aspect, the method further includes:

In some possible implementations, the available uplink resources may be Uplink (UL) and/or Flexible (Flexible) portions, and the available uplink resources do not collide with downlink signals or high priority resources, while the uplink resources are time-spaced from a previous downlink signal by a guard interval (e.g., the guard interval includes a terminal device processing time, and/or an uplink/downlink switching time, etc.).

after the K repeated transmissions, M random access procedure messages three are transmitted.

In some possible implementations, the downlink signal includes one or more of a downlink synchronization signal block (SS/PBCH block), remaining Minimum System Information (RMSI), a control resource set (Control Resource Set, CORESET), a downlink signal (DL) in a semi-static/semi-persistent uplink/downlink configuration, and/or a Flexible (Flexible) portion. The high priority signals include one or more of a physical random access channel (Physical Random Access Channel, PRACH), a physical uplink control channel, PUCCH, an uplink Sounding Reference Signal (SRS), reserved resources (Reserved).

for the random access procedure message three of K repeated transmissions, frequency hopping transmission may be employed.

For example, the frequency domain location of the frequency hopping transmission may be indicated in the random access procedure message two, or the frequency hopping pattern may be indicated using the frequency domain resource indication field in the random access procedure message two.

For another example, in K repetition transmissions, a fixed frequency hopping pattern (pattern) is used, or the frequency position of the frequency hopping transmission is associated with the repetition number.

It should be understood that in the embodiment of the present application, the frequency hopping transmission refers to using different frequency domain positions when the random access procedure message three is repeatedly transmitted, which is helpful for obtaining the frequency domain diversity gain.

In a fourth aspect, there is provided a communication apparatus operable to perform the operations of the terminal device of the first and third aspects and any possible implementation thereof. In particular, the communication apparatus may comprise a module unit for performing the respective operations of the terminal device in the above-mentioned first and third aspects and any possible implementation forms thereof.

In a fifth aspect, there is provided a communication apparatus operable to perform the operations of the network device of the second aspect and any possible implementation thereof. In particular, the communication apparatus may comprise a module unit for performing the respective operations of the network device in the second aspect and any possible implementation thereof described above.

In a sixth aspect, there is provided a terminal device comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory communicate with each other through an internal connection path. The memory is used for storing instructions, and the processor is used for executing the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the terminal device to perform any one of the methods of the first and third aspects and any possible implementation thereof, or the execution causes the terminal device to implement the communication apparatus provided in the fourth aspect.

In a seventh aspect, there is provided a network device comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory communicate with each other through an internal connection path. The memory is used for storing instructions, and the processor is used for executing the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the network device to perform any one of the methods of the second aspect and any possible implementation thereof, or the execution causes the network device to implement the communication apparatus provided in the fifth aspect.

In an eighth aspect, a chip system is provided, comprising a memory for storing a computer program and a processor for calling and running the computer program from the memory, such that a communication device in which the chip system is installed performs any of the methods of the first to third aspects and possible implementations thereof.

In a ninth aspect, there is provided a computer program product comprising: computer program code which, when run by a communication unit, processing unit or transceiver, processor of a communication device (e.g. a network device or a terminal device), causes the communication device to perform the method of any of the above first to third aspects and possible implementations thereof.

In a tenth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program for causing a communication device (e.g. a network device or a terminal device) to perform any of the methods of the first to third aspects and possible implementations thereof.

In an eleventh aspect, there is provided a computer program which, when executed on a computer, causes the computer to carry out any of the methods of the first to third aspects and possible implementations thereof.

In a twelfth aspect, there is provided a communication system comprising the communication apparatus provided in the fourth aspect, and/or the communication apparatus provided in the fifth aspect; or,

the communication system comprises the terminal device provided in the sixth aspect and/or the network device provided in the seventh aspect.

Drawings

Fig. 1 is a schematic diagram of a communication system provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of a network architecture according to an embodiment of the present application.

Fig. 3 is a schematic diagram of another network architecture according to an embodiment of the present application.

Fig. 4 is a schematic flow chart of a terminal device and a network device performing random access in four steps.

Fig. 5 is a schematic flow chart of a communication method provided in an embodiment of the present application.

Fig. 6 is a schematic diagram of time domain positions of K repetition transmissions.

Fig. 7 is another schematic diagram of time domain positions of K repetition transmissions.

Fig. 8 is a schematic flow chart of another communication method provided in an embodiment of the present application.

Fig. 9 is a schematic block diagram of a communication device provided in an embodiment of the present application.

Fig. 10 is another schematic block diagram of a communication device provided by an embodiment of the present application.

Fig. 11 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

Fig. 12 is a schematic block diagram of a network device provided in an embodiment of the present application.

Detailed Description

In the following, some terms in the present application will be described:

1) A terminal device, also called a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice/data connectivity to a user, for example, a handheld device having a wireless connection function, a vehicle-mounted device, etc. Currently, some examples of terminals are: a mobile phone, a tablet, a notebook, a palm, a mobile internet device (mobile internet device, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

2) The network device is a device in a wireless network, such as a radio access network (radio access network, RAN) node that accesses the terminal to the wireless network. Currently, some examples of RAN nodes are: a gNB, a transmission and reception point (transmission reception point, TRP), an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), or a wireless fidelity (wireless fidelity, wifi) Access Point (AP), etc. In one network architecture, the network devices may include Centralized Unit (CU) nodes, or Distributed Unit (DU) nodes, or RAN devices including CU nodes and DU nodes.

The network device in this embodiment of the present application may be a device for communicating with a terminal device, where the network device may be a base station (Base Transceiver Station, BTS) in a global system for mobile communications (Global System of Mobile communication, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a base station (NodeB, NB) in a wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, an evolved base station (eNB or eNodeB) in an LTE system, a wireless controller in a cloud wireless access network (Cloud Radio Access Network, CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, etc., which is not limited in this application.

Before describing the embodiments of the present application, first, related concepts in several HARQ will be briefly described.

HARQ process (HARQ process): HARQ uses stop-and-wait protocol (stop-and-wait protocol) to transmit data. In the stop-and-wait protocol, after a transmitting end transmits a Transport Block (TB), it stops waiting for feedback information, and acknowledges the TB with positive (ACK) or Negative (NACK). But the sender stops waiting for acknowledgements after each transmission, resulting in low throughput. Thus, in long term evolution (Long Term Evolution, LTE), it is specified in the New air interface NR (New Radio) of the 5G communication system that a terminal device can use multiple parallel HARQ processes: while one HARQ process is waiting for acknowledgement information, the transmitting end may continue to transmit data using another HARQ process.

Redundancy version (Redundancy Version, RV): for indicating redundancy versions used for transmission, which range from 0 to 3.

Modulation and coding strategy (Modulation and Coding Scheme, MCS): downlink control information (Downlink Control Information, DCI) in LTE uses 5-bit MCS index (0-31) to indicate the modulation and coding pattern used for the current transmission and affects the selection of TB Size (TBs). The MCS totals 32 combinations, of which 3 combinations (index 29-31) are reserved and these 3 combinations are used only for retransmissions.

It should be further noted that, in the embodiment of the present application, the "protocol" may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited in this application.

It should also be noted that, in the embodiments shown below, the first, second, etc. are only for convenience of distinguishing different objects, and should not constitute any limitation to the present application.

It should be further noted that, the "and/or" describing the association relationship of the association object indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one" means one or more; "at least one of a and B", similar to "a and/or B", describes an association relationship of an association object, meaning that there may be three relationships, for example, at least one of a and B may represent: a exists alone, A and B exist together, and B exists alone.

Fig. 1 is a schematic diagram of a communication system 100 according to an embodiment of the present application, where as shown in fig. 1, a terminal device 130 accesses a wireless network to obtain services of an external network (such as the internet) through the wireless network, or communicates with other terminal devices through the wireless network. The wireless network includes a RAN110 and a Core Network (CN) 120, wherein the RAN110 is configured to access a terminal device 130 to the wireless network, and the CN120 is configured to manage the terminal device and provide a gateway for communication with an external network.

It should be appreciated that the data transmission method provided herein may be applicable to a wireless communication system, such as the wireless communication system 100 shown in fig. 1. Two communication devices in the wireless communication system have a wireless communication connection therebetween, and one of the two communication devices may correspond to the terminal device 130 shown in fig. 1, for example, may be the terminal device 130 in fig. 1 or may be a chip configured in the terminal device 130; the other of the two communication apparatuses may correspond to RAN110 shown in fig. 1, for example, may be RAN110 in fig. 1 or a chip configured in RAN 110.

Hereinafter, the embodiments of the present application will be described in detail by taking an interaction procedure between a terminal device and a network device as an example without losing generality. It will be appreciated that any one of the terminal devices in the wireless communication system may communicate with one or more network devices having a wireless communication connection based on the same method. The present application is not limited in this regard.

Fig. 2 is a schematic diagram of a network architecture provided in an embodiment of the present application, and as shown in fig. 2, the network architecture includes a CN device and a RAN device. The RAN device includes a baseband device and a radio frequency device, where the baseband device may be implemented by one node, or may be implemented by multiple nodes, and the radio frequency device may be implemented independently from the baseband device, or may be integrated into the baseband device, or a part of the radio frequency device may be integrated into the baseband device. For example, in a long term evolution (Long Term Evolution, LTE) communication system, a RAN apparatus (eNB) includes a baseband device and a radio frequency device, where the radio frequency device may be remotely located relative to the baseband device, e.g., a remote radio unit (remote radio unit, RRU) is remotely located relative to the BBU.

The communication between the RAN device and the terminal device follows a certain protocol layer structure. For example, the control plane protocol layer structure may include the functions of protocol layers such as a radio resource control (radio resource control, RRC) layer, a packet data convergence layer protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, a medium access control (media access control, MAC) layer, and a physical layer. The user plane protocol layer structure may include the functions of protocol layers such as PDCP layer, RLC layer, MAC layer, and physical layer; in one implementation, a traffic data adaptation (service data adaptation protocol, SDAP) layer may also be included above the PDCP layer.

The functions of these protocol layers may be implemented by one node, or may be implemented by a plurality of nodes; for example, in one evolution structure, a RAN device may include a Centralized Unit (CU) and a Distributed Unit (DU), and a plurality of DUs may be centrally controlled by one CU. As shown in fig. 2, a CU and a DU may be divided according to protocol layers of a wireless network, for example, functions of a PDCP layer and above are set at the CU, and functions of protocol layers below the PDCP layer, for example, functions of an RLC layer and a MAC layer, etc. are set at the DU.

The RAN device may implement, by one node, functions of protocol layers such as radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP), radio link control (radio link control, RLC), and medium access control (Media Access Control, MAC); or the functions of the protocol layers may be implemented by a plurality of nodes; for example, in one evolution structure, a RAN device may include a Centralized Unit (CU) and a Distributed Unit (DU), and a plurality of DUs may be centrally controlled by one CU. As shown in fig. 2, a CU and a DU may be divided according to protocol layers of a wireless network, for example, functions of a PDCP layer and above are set at the CU, and functions of protocol layers below the PDCP layer, for example, functions of an RLC layer and a MAC layer, etc. are set at the DU.

The division of the protocol layer is merely an example, and other protocol layers may be divided, for example, division in the RLC layer, where functions of the RLC layer and above are set in the CU, and functions of the protocol layer below the RLC layer are set in the DU; alternatively, the protocol layer may be divided, for example, by setting a part of functions of the RLC layer and functions of protocol layers above the RLC layer to CU, and setting the remaining functions of the RLC layer and functions of protocol layers below the RLC layer to DU. In addition, the functions that require processing time to meet the latency requirement may be set in the DU and the functions that do not require processing time to meet the latency requirement may be set in the CU in other manners, such as time-lapse partitioning.

In addition, the rf device may be remote, not placed in the DU, or may be integrated in the DU, or a portion of the remote may be integrated in the DU, without any limitation.

With continued reference to fig. 3, fig. 3 is a schematic diagram of another network architecture provided in the embodiment of the present application, and, with respect to the architecture shown in fig. 2, the Control Plane (CP) and the User Plane (UP) of the CU may be implemented by separating the control plane CU entity (CU-CP entity) and the user plane CU entity (CU-UP entity) into different entities.

In the above network architecture, the signaling generated by the CU may be transmitted to the terminal device through the DU, or the signaling generated by the terminal device may be transmitted to the CU through the DU. The DU may be passed through to the terminal device or CU directly through protocol layer encapsulation without parsing the signaling. In the following embodiments, transmission or reception of signaling by a DU includes such a scenario if such signaling is involved in the transmission between the DU and the terminal device. For example, the signaling of the RRC or PDCP layer is eventually processed as the signaling of the PHY layer to be transmitted to the terminal device, or is converted from the received signaling of the PHY layer. Under this architecture, the signaling of the RRC or PDCP layer can be considered as being sent by either a DU or by both a DU and a radio frequency.

In the above embodiments, the CU is divided into network devices on the RAN side, and in addition, the CU may be divided into network devices on the CN side, which is not limited herein.

The apparatus in the following embodiments of the present application may be located in a terminal device according to the functions implemented by the apparatus. When the above CU-DU structure is adopted, the network device may be a CU node, or a DU node, or a RAN device including the CU node and the DU node.

Fig. 4 shows a schematic flow chart of a terminal device and a network device performing random access in four steps, it being understood that fig. 4 takes CBRA in NR as an example, and the process includes:

s210, the terminal device sends a random access procedure message one (Msg 1) to the network device.

It should be appreciated that the random access procedure message one (Msg 1) may also be referred to as a random access request message or a random access preamble sequence (preamble).

The primary function of the preamble is to tell the network device that there is a random access request and enable the network device to estimate the transmission delay between the remaining terminal devices so that the network device calibrates the uplink timing and informs the terminal devices of the calibration information via the random access procedure message two (Msg 2) in S220.

There are 64 preamble sequences available per cell, and the terminal device may choose preamble (CFRA) to transmit on the physical random access channel (Physical Random Access Channel, PRACH). The network device informs the terminal device of the time-frequency resource set of PRACH which can be used for transmitting preamble in the current cell through the system message, and when the terminal device initiates random access, PRACH resources are required to be selected, so that the preamble is transmitted.

S220, the network device sends a random access procedure message two (Msg 2) to the terminal device.

It is to be understood that the random access procedure message two (Msg 2) may also be referred to as a random access response message.

Specifically, after receiving the preamble sent by the terminal device, the network device sends a corresponding Random Access Response (RAR) to the terminal device, which may include time domain and frequency domain information of a random access procedure message three (Msg 3) in S230, a modulation coding mode used for Msg3, a preamble identifier, timing Advance (TA) information, initial Uplink grant (UL grant) information, and identification information of the terminal device, where for CBRA, the terminal device receives the RAR, and then determines whether the preamble identifier in the RAR is the same as the preamble sent in S210, if so, the RAR is considered to be successfully received, otherwise, the terminal device considers that the RAR is failed to be received, and the terminal device may re-trigger the RA procedure.

S230, the terminal device sends a random access procedure message three (Msg 3) to the network device.

Specifically, the terminal device sends data on a corresponding uplink transmission resource through a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) according to UL grant information indicated in the RAR, and may include a radio resource control layer (Radio Resource Control, RRC) message, identification information of the terminal device, such as C-RNTI information of the terminal device, a Resume identifier (Resume ID) or an Inactive identifier (I-RNTI) of the terminal device, where the Resume ID or the I-RNTI is allocated to the terminal device by the network device, and the terminal device reports the identifier for the network device to identify the identity of the terminal device and relevant configuration information and other purposes.

S240, the network device sends a random access procedure message four (Msg 4) to the terminal device.

Specifically, since the terminal device will carry the identification information of the terminal device in S230, the network device will carry the identification information of the terminal device in the collision resolution mechanism through Msg4 in S240 to designate the terminal device that wins in the collision resolution, and other terminal devices that do not wins in the collision resolution will reinitiate the random access.

In the embodiment of the present application, mainly aiming at the problem that the uplink coverage performance of Msg3 in S230 is low, the uplink coverage performance of Msg3 is improved by repeatedly sending Msg3 and/or sending Msg3 by using a scaling factor.

Fig. 5 is a schematic flowchart of a communication method 300 provided in the embodiment of the present application, as shown in fig. 5, an execution body of the method 300 may be a terminal device, or may be a chip or an apparatus for the terminal device (hereinafter, the execution body is described as an example of the terminal device), and the method 300 includes:

s310, the terminal equipment determines a first random access parameter, wherein the first random access parameter comprises the repeated sending times of a random access process message III and/or a first expansion factor, and the first expansion factor is the expansion factor of a transmission block corresponding to the random access process message III;

And S320, the terminal equipment sends the random access procedure message III to the network equipment according to the first random access parameter.

Optionally, the first random access parameter includes a number of repeated sending of the random access procedure message three, and the terminal device sends the random access procedure message three to the network device according to the first random access parameter, including:

It should be understood that in the embodiment of the present application, repeated transmission represents that the terminal device performs multiple transmissions on the same transport block; the repeated transmission may select a different redundancy version of the data than the previous transmission, e.g., when 2 repeated transmissions are made, RV1 may be selected for the first transmission and RV2 may be selected for the second transmission.

Specifically, before transmitting Msg3, the terminal device determines the number of repeated transmissions of Msg3 (for example, the number of repeated transmissions is K times, and K is a positive integer greater than or equal to 1), and may perform K repeated transmissions on Msg3

The communication method of the embodiment of the application helps to improve the uplink coverage performance of the Msg3 by repeatedly sending the Msg 3.

Optionally, the first random access parameter includes the first scaling factor, and the terminal device sends the random access procedure message three to the network device according to the first random access parameter, including:

In this embodiment of the present application, the scaling factor (sf) is a value less than or equal to 1, and when determining the size of the transport block, the scaling factor is applied to realize that fewer information bits are transmitted on the same number of resources, so as to achieve the purpose of improving reliability. For example, after determining the scaling factor sf, the terminal calculates n_info by equation (1):

N_info＝sf*N_re*R*Q_m*v (1)

wherein n_re is the number of resource elements allocated to the terminal device by the network device, q_m is the modulation order, R is the code rate, and v is the number of layers. N_info is an intermediate variable that determines the transport block size.

After the terminal equipment determines the N_info, determining the size of a transmission block of the final Msg3, encapsulating the Msg3 according to the determined size of the transmission block of the Msg3, and sending the encapsulated Msg3 to the network equipment.

Specifically, before transmitting Msg3, the terminal device determines a first scaling factor for transmitting the Msg3, and the terminal device transmits the Msg3 using the first scaling factor.

According to the communication method, the transmission block expansion factor corresponding to the Msg3 is configured, so that the code rate of the Msg3 is reduced under the condition that a modulation and coding mode is not changed, and the uplink coverage performance of the Msg3 is improved.

Optionally, the first random access parameter includes a number of repeated sending of the random access procedure message three and the first scaling factor, and the terminal device sends the random access procedure message three to the network device according to the first random access parameter, including:

Specifically, the terminal device may transmit the Msg3 using the first scaling factor in each transmission procedure of the repeated transmission procedure on the basis of the repeated transmission.

The communication method of the embodiment of the application is beneficial to improving the uplink coverage performance of the Msg3.

Optionally, the method 300 further includes:

the network device determines the first random access parameter.

In particular, the network device may determine the first random access parameter before receiving the Msg3, and correctly decode the Msg3 according to the first random access parameter after receiving the Msg3.

Optionally, the method further comprises:

s301, the terminal equipment sends a random access procedure message I to the network equipment, wherein the format of the random access procedure message I is associated with the first random access parameter;

Optionally, the method 300 further includes:

It should be understood that the association of the format of the first random access procedure message with the first random access parameter may refer to a correspondence between the format of the preamble and the first random access parameter, or may refer to a mapping between the format of the preamble and the first random access parameter.

For example, the number of retransmissions is associated with the format of the preamble, and different types of formats of the preamble may be associated with the same or different numbers of retransmissions, as shown in table 1.

Table 1 correspondence between the number of repeated transmissions and the format of preamble

It should be understood that, in the embodiment of the present application, the association relationship between the number of repeated transmissions and the format of the preamble is not limited to a table, and the association relationship between the number of repeated transmissions and the preamble may be established in other manners.

It should also be understood that, in the embodiment of the present application, the specific number of repeated transmissions corresponding to each format is not limited, and the number of repeated transmissions may be greater than or equal to 1.

It should also be understood that the number of repeated transmissions is the maximum number of repeated transmissions of the Msg3, and the network device may instruct the terminal device to stop transmitting in advance if the Msg3 has been successfully demodulated before the terminal device transmits to the maximum number of repeated transmissions.

For example, when the preamble format is C0, the terminal device may determine that the number of repeated transmissions of the Msg3 is 2, and the terminal device may repeat the transmission of the Msg3 2 times.

For another example, the format of the random access procedure message one is associated with the first scaling factor, and the formats of different types of preambles may be associated with the same or different first scaling factors, as shown in table 2.

Table 2 correspondence between the first scaling factor and the format of the preamble

Random access preamble format	First scaling factor	Random access preamble format	First scaling factor
				Long sequence-0	1/2	A3 or A3/B3	1/8
Long sequence-1	1/4	B1	1
				Long sequence-2	1/8	B4	1/8
Long sequence-3	1/2	C0	1/4
				A1 or A1/B1	1	C2	1/8
A2 or A2/B2	1/2

It should be understood that, in the embodiment of the present application, the association relationship between the first scaling factor and the format of the preamble is not limited to a table, and the association relationship between the first scaling factor and the preamble may be established in other manners.

It should also be understood that, in the embodiments of the present application, the value of the first scaling factor corresponding to each format is not limited, and the value of the first scaling factor may be less than or equal to 1.

For example, when the preamble format is C0, the terminal device may determine that the first scaling factor corresponding to the Msg3 is 1/4, and the terminal device may use the scaling factor to send the Msg3.

For another example, table 1 and table 2 may be combined, when the preamble format is C0, the terminal device may determine that the number of repeated transmission of the Msg3 is 2 and the corresponding first scaling factor is 1/4, and the terminal device may use the scaling factor to repeatedly transmit the Msg3 to the network device twice.

Optionally, the method 300 further includes:

For example, in the embodiment of the present application, the preamble format may also correspond to the number of repetitions of one or more candidates, as shown in table 3.

Table 3 correspondence between the repeated transmission times set and the preamble format

Alternatively, the network device may indicate a specific number of repetitions in the candidate set through the indication information, for example, the network device may indicate a specific value in the two candidate repetition transmission times with 1 bit.

It should be appreciated that the manner of indication may be included in one or more of a system message (SI), a remaining minimum system message (RMSI), other system messages, a synchronization message block, msg 2.

It should be understood that, in the embodiments of the present application, the specific repeated sending values and numbers are not limited, and the number of bits used for indication by the network device is not limited.

For example, when the preamble format is C0, the terminal device may determine, through the indication information, whether the number of repeated transmissions of the Msg3 is 1 or 2.

For example, in the embodiment of the present application, the format of the preamble may also correspond to one or more candidate scaling factors, as shown in table 4.

Table 4 correspondence between the first scaling factor and the format of the preamble

Random access preamble format	First scaling factor	Random access preamble format	First scaling factor
				Long sequence-0	{1,1/2}	A3 or A3/B3	{1,1/8}
Long sequence-1	{1,1/4}	B1	{1,1/2}
				Long sequence-2	{1,1/8}	B4	{1,1/8}
Long sequence-3	{1,1/2}	C0	{1,1/4}
				A1 or A1/B1	{1,1/2}	C2	{1,1/8}
A2 or A2/B2	{1,1/4}

Alternatively, the network device may indicate the first scaling factor of the candidate plurality of scaling factors by the indication information, for example, the network device may indicate the first scaling factor of the two candidate scaling factors with 1 bit.

It should be understood that, in the embodiments of the present application, the specific scaling factor value and number are not limited, and the number of bits used for indication by the network device is not limited.

For example, when the preamble format is C0, the terminal device may determine, through the indication information, whether the first scaling factor corresponding to the Msg3 is 1 or 1/4.

For another example, table 3 and table 4 may be combined, when the format of the preamble is C0, the terminal device may determine that the first scaling factor corresponding to the Msg3 is 1/4 through the indication information, and the number of repeated transmission of the Msg3 is 2, and then the terminal device uses the first scaling factor to repeatedly transmit the Msg3 to the network device twice.

In some possible implementations, the embodiments of the present application further provide a communication method, where the communication method includes:

The network equipment sends a downlink signal to the terminal equipment, and the terminal equipment receives the downlink signal sent by the network equipment;

the terminal equipment estimates according to the downlink signal, and determines a first random access parameter, wherein the first random access parameter comprises the repeated sending times of a random access process message III and/or a first expansion factor, the first expansion factor is the expansion factor of a transmission block of the random access process message III, and the first random access parameter is associated with a random access preamble sequence;

the terminal equipment determines a first random access preamble sequence according to the first random access parameter, wherein the first random access parameter corresponds to the first random access preamble sequence;

the terminal device sends the first random access preamble sequence to the network device, and the network device receives the first random access preamble sequence sent by the terminal device.

It is to be appreciated that the random access preamble sequence may also be referred to as Msg1.

It is further understood that the first random access parameter and the random access preamble sequence are associated as well as the first random access parameter and the identification information (Random Access Procedure Identifier, RAPID) of the random access preamble sequence. For example, the association of RAPID and repetition times is shown in the following table:

Table 5 RAPID and repeat number association relationship

RAPID	Number of repetitions
		0～A	1
A+1～B	2
		B+1～C	3
…	…

A, B, C in the table are one division (grouping) of all available preamble sequences. The number of repetitions may be the maximum number of repetitions. Alternatively, the network device may additionally indicate in Msg2 for a number of repetitions per packet.

It should also be understood that the downlink information includes one or more of a synchronization signal block SSB, a channel state information reference signal CSI-RS, a demodulation reference signal DMRS, and the like.

Optionally, the number of repeated transmissions of Msg3 and/or the first scaling factor of the transport block of Msg3 may be associated with a random access preamble. For example, the random access preamble is divided into groups, each group being associated with a different number of repeated transmissions and/or a first scaling factor.

Alternatively, the first random access parameter may also be determined by the network device and signalled to the terminal device prior to the random access procedure. For example, the random access procedure may be triggered by the PDCCH and the first random access parameter used is indicated in the downlink control information DCI. Or, the network device instructs the terminal device to perform the identification information (Random Access Procedure Identifier, RAPID) of the random access preamble sequence adopted by the random access, and the RAPID and the first random access have the association relationship.

It should be appreciated that since the first scaling factor may be used to calculate the size of the transport block of Msg3, the random access preamble sequence may also be divided into groups, each group being associated with a different number of repeated transmissions and/or the size of the transport block of Msg 3.

And the terminal equipment determines the repeated sending times and/or the first expansion factor according to the downlink signal estimation. And the terminal equipment selects a preamble in the corresponding packet according to the repeated transmission times and/or the first telescopic factor and/or the transport block size, and transmits the preamble.

Optionally, the method further comprises:

the network equipment determines the repeated sending times of the random access process message III according to the received first random access preamble sequence, and allocates corresponding resources in the random access process message II.

Optionally, the method further comprises:

the network device determines a first scaling factor of a transport block of the random access procedure message three according to the received first random access preamble sequence.

Optionally, the method 300 further includes:

s302, the terminal equipment receives a second random access procedure message sent by the network equipment, wherein the second random access procedure message comprises a second random access parameter, the second random access parameter comprises a timing advance and/or a power control parameter, and the second random access parameter is associated with the first random access parameter;

For example, in the present example, the power control parameter may be associated with the number of repetitions, as shown in table 6:

table 6 correspondence between the number of repeated transmissions and the power control parameter

Power control parameters	(maximum) number of repeated transmissions
		0	1
1	1
		2	1
3	1
		4	2
5	2
		6	2
7	3

Alternatively, the network device may indicate the first repetition number of the plurality of repetition numbers of the candidates through the indication information, for example, the network device may indicate the first repetition number of the two candidate repetition numbers with 1 bit.

It should be understood that, in the embodiments of the present application, the specific number and number of repetitions are not limited, and the number of bits used for indication by the network device is not limited.

It should also be understood that, in the embodiment of the present application, the number of repeated transmissions may also be associated with a power adjustment value corresponding to the power control parameter, as shown in table 7:

Table 7 correspondence between the number of repeated transmissions and the power adjustment value

For another example, in the present application example, the power control parameters may be associated with a scaling factor, as shown in table 8:

table 8 correspondence between the first scaling factor and the power control parameter

Power control parameters	First scaling factor
		0	1
1	1
		2	1
3	1
		4	1/2
5	1/2
		6	1/4
7	1/8

Optionally, the number of repeated transmissions and/or the first scaling factor may be associated with a random access procedure target preamble received power or a preamble received power. For example, different target preamble received power/preamble received power values may be associated with one or more repetition times and/or a scaling factor. Optionally, the network device may indicate the candidate multiple repetition times and/or the scaling factor by additional indication information.

For example, the network device may determine whether Msg3 performs retransmission according to the received power of the random access procedure Msg 2. The receiving power of the random access procedure Msg1 may include receiving power by the network device after the terminal device performs power ramp-up after the transmission failure of the Msg 1. The Msg3 retransmission and/or the indication of the number of retransmissions and/or the indication of the retransmission may be indicated/configured in one or more of message 2 (Msg 2), system message (SI), remaining minimum system message (RMSI), broadcast message, RRC.

It should also be understood that, in the embodiment of the present application, the number of repeated transmissions may also be associated with a power adjustment value corresponding to the power control parameter, as shown in table 9:

table 9 correspondence between the first scaling factor and the power adjustment value

Optionally, the method 300 further includes:

the network equipment determines a second random access parameter according to the first random access process message;

It should be understood that, in this embodiment of the present application, the timing advance refers to that, in order for the terminal device to obtain uplink synchronization, an uplink signal is sent in advance to compensate for the transmission time from the terminal device to the network device. The network device may determine the timing advance of the terminal through one or more of the random access preamble, SRS, DMRS sent by the terminal, and notify the terminal of the timing advance/timing advance adjustment in the random access procedure message 2 or MAC-CE.

It should also be understood that, in the embodiment of the present application, the power control parameter is a power adjustment amount that the network device determines, according to the received power of the random access preamble sent by the terminal, that the terminal device sends the random access procedure message three, and indicates the power control parameter of the terminal in the random access procedure message two.

It should be appreciated that the association of the second random access parameter with the first random access parameter may refer to a correspondence between a TA and the first random access parameter, or may refer to a mapping between the second random access parameter and the first random access parameter.

For example, the number of retransmissions is associated with a TA, and different TAs may be associated with the same or different numbers of retransmissions, as shown in table 10.

Table 10 correspondence between the number of repeated transmissions and TA

TA(us)	(maximum) number of repeated transmissions
		0-500	1
501-1000	2
		1001-1500	3
1501-2000	4

It should be understood that, in the embodiment of the present application, the association relationship between the number of repeated transmissions and the TA is not limited to a table, and the association relationship between the number of repeated transmissions and the TA may be established in other manners.

It should be further understood that, in the embodiment of the present application, a specific value of the specific number of repeated transmissions is not limited, and a specific interval length and an interval number corresponding to TA are not limited, and the number of repeated transmissions may be greater than or equal to 1.

It should also be understood that the number of repeated transmissions is the maximum number of repeated transmissions of the Msg3, and the network device may instruct the terminal device to stop transmitting in advance if the Msg3 has been successfully demodulated before the terminal device transmits to the maximum number of repeated transmissions. The benefit of this approach is that the TA value, as an existing field for Msg2, is associated with the maximum number of repeated transmissions, and no additional bit indication may be required.

For example, when the TA is 600us, the terminal device may determine that the number of repeated transmissions of the Msg3 is 2, and the terminal device may repeat the transmission of the Msg3 2 times.

As another example, the TA is associated with the first scaling factor, and different TAs may be associated with the same or different first scaling factors, as shown in table 11.

Table 11 correspondence between first scaling factor and TA

TA(us)	First scaling factor
		0-500	1/2
501-1000	1/4
		1001-1500	1/6
1501-2000	1/8

It should be understood that, in the embodiment of the present application, the specific value of the first scaling factor is not limited, and the specific interval length and the number of intervals corresponding to TA are not limited, and the first scaling factor may be less than or equal to 1.

For example, when the TA is 600us, the terminal device may determine that the first scaling factor is 1/4, and the terminal device may send the Msg3 using the first scaling factor.

For another example, table 10 and table 11 may be combined, when the TA is 600us, the terminal device may determine that the first scaling factor is 1/4 and the number of repeated transmissions of the Msg3 is 2, and the terminal device may use the first scaling factor to repeatedly transmit the Msg3 to the network device twice.

In some possible implementations, the embodiments of the present application further provide a correspondence between TA and power control parameters and the number of repeated transmissions, as shown in table 12:

table 12 TA correspondence between power control parameters and number of repeated transmissions

TA	Power control parameters	(maximum) number of repeated transmissions
			0-500	0-3	1
501-1000	4-6	2
			1001-1500	7	3
1501-2000	0-7	4

It should be understood that, in the embodiment of the present application, the length of the interval and the number of intervals corresponding to TA are not limited, and the specific number of repeated transmissions is not limited, and the number of repeated transmissions may be greater than or equal to 1.

It should also be appreciated that table 11 is merely illustrative, and that the correspondence relationship may be added to table 11, for example, the number of repeated transmissions corresponding to TA of 0-500us and power control parameter of 4-7, and for example, the number of repeated transmissions corresponding to TA of 501-1000us and power control parameter of 0-3.

For example, when TA is 600us and the power control parameter is 4 is satisfied, the terminal device may determine that the number of repeated transmissions of Msg3 is 2.

In some possible implementations, the embodiments of the present application may further provide a correspondence between TA and power control parameters and a first scaling factor, as shown in table 13:

table 13 TA and correspondence of power control parameters to first scaling factor

TA	Power control parameters	First scaling factor
			0-500	4 or 5	1/2
501-1000	6	1/4
			1001-1500	7	1/6
1501-2000	0-7	1/8

It should be understood that the embodiment of the present application is not limited to the interval length and the number of intervals corresponding to TA, and is not limited to a specific value of the first scaling factor, and the first scaling factor may be less than or equal to 1.

It should also be appreciated that table 13 is merely illustrative, and that the correspondence relationship may be added to table 13, for example, a first scaling factor corresponding to TA of 0-500us and power control parameter of 6 or 7, and for example, a first scaling factor corresponding to TA of 501-1000us and power control parameter of 1-5.

For example, when TA is 600us and the power control parameter is 6, the terminal device may determine that the scaling factor of the transport block of Msg3 is 1/4.

In some possible implementations, the method further includes:

For example, in the embodiment of the present application, the TA may also correspond to the number of repetitions of one or more candidates, as shown in table 14.

Table 14 correspondence between the number of repeated transmissions and TA

TA(us)	(maximum) number of repeated transmissions
		0-500	{1,2}
501-1000	{1,2}
		1001-1500	{1,3}
1501-2000	{1,3}

It should be understood that, in the embodiment of the present application, the specific repeated transmission value and number are not limited, and the specific interval length and interval number corresponding to the TA are not limited, and the number of bits used for indication by the network device is not limited.

For example, when the TA is 600us, the terminal device may determine, through the indication information, whether the number of repeated transmissions of the Msg3 is 1 or 2.

For another example, in the embodiment of the present application, the TA may also correspond to one or more candidate scaling factors, as shown in table 15.

TABLE 15 correspondence between first scaling factor and TA

TA(us)	First scaling factor
		0-500	{1,1/2}
501-1000	{1/2,1/4}
		1001-1500	{1/4,1/6}
1501-2000	{1/6,1/8}

It should be understood that, in the embodiments of the present application, the specific scale factor value and number are not limited, and the specific interval length and interval number corresponding to TA are not limited, and the number of bits used for indication by the network device is not limited.

For example, when the TA is 600us, the terminal device may determine, through the indication information, whether the first scaling factor corresponding to the Msg3 is 1/2 or 1/4.

For another example, table 14 and table 15 may be combined, when the TA is 600us, the terminal device may determine that the first scaling factor corresponding to the Msg3 is 1/4 through the indication information, and the number of repeated transmissions of the Msg3 is 2, and then the terminal device uses the first scaling factor to repeatedly transmit the Msg3 to the network device twice.

Optionally, the method further comprises:

s302, the terminal equipment receives a random access procedure message II sent by the network equipment;

Specifically, when determining the first scaling factor of the Msg3, the terminal device may determine the first scaling factor according to the second scaling factor of the received Msg 2.

For example, the terminal device may employ the second scaling factor of the Msg2 when determining the first scaling factor of the Msg3, i.e. the scaling factor of the Msg2 is multiplexed by the Msg 3.

For another example, when determining the first scaling factor of the Msg3, the terminal device may multiply the second scaling factor of the Msg2 by a factor to obtain the first scaling factor.

Optionally, the one scaling factor is smaller than or equal to the second scaling factor.

Optionally, the method 300 further includes:

s301, the network equipment receives a random access procedure message I sent by the terminal equipment;

Optionally, the method further comprises:

Specifically, the network device sends indication information to the terminal device, where the indication information is used to indicate a first scaling factor in the set of scaling factors.

For example, when the network device adopts 1bit indication, the scaling factor corresponding to Msg2 is 1, the scaling factor corresponding to Msg 3 may be {1,1/2}, and the 1bit indication information may indicate that the first scaling factor is 1 or 1/2; for another example, if the scaling factor corresponding to Msg2 is 1/2, the scaling factor corresponding to Msg 3 may be {1/2,1/4}, and the 1bit indication information may indicate that the first scaling factor is 1/2 or 1/4.

In the embodiment of the present application, the specific value of the first scaling factor corresponding to Msg 3 is not limited, as long as it is less than or equal to the scaling factor corresponding to Msg 2.

Optionally, the method 300 further includes:

the terminal equipment determines the time domain position and the HARQ retransmission period of the repeated transmission for K times, wherein K is the number of repeated transmission, and K is a positive integer which is more than or equal to 1, and the time of the repeated transmission for K times is less than one HARQ retransmission period.

In one possible implementation, the time domain locations of the K repeated transmissions are adjacent in time, and fig. 6 shows the time domain locations of the K repeated transmissions.

Alternatively, the network device configures (or defaults) the HARQ retransmission period, which may be equal to a fixed value, or an integer multiple of the semi-static uplink and downlink configuration period indicated in the remaining minimum system message (RMSI) of the network device configuration.

Optionally, the HARQ retransmission period is predefined by the protocol.

It should be understood that if the network device is configured with two semi-static configuration periods X and Y, the HARQ retransmission period is an integer multiple of min (X, Y), or max (X, Y), or (x+y), which is not limited in any way by the present application.

In one possible implementation, the time domain locations of the K-time repeated transmissions are not adjacent in time, and fig. 7 shows another time domain location of the K-time repeated transmissions.

Optionally, the method 300 further includes:

the terminal equipment receives first indication information sent by the network equipment, wherein the first indication information is used for indicating an offset value of the time domain position of the K times of repeated transmission in the HARQ period.

For the period described in the two modes, the network device may additionally configure the offset value of the specific Msg3 transmission or time-repeated position in the period through signaling. For example, the HARQ retransmission period is T, and for a certain terminal device, the time domain position of K times of repeated transmission can be configured to be offset value offset=0 to T-1 in the period.

For example, the HARQ retransmission period is 5ms, the offset value is 1ms, and the time domain position of the K repeated transmissions is 1ms after the starting time of the HARQ period.

Optionally, the time domain location of the K repeated transmissions includes a slot location of each of the K repeated transmissions, and the method 300 further includes:

the terminal device determines the symbol position of each transmission in the slot position of each transmission.

Specifically, the two modes can be used for determining the time slot position of the terminal device for transmitting the Msg3, and the symbol position of the specific Msg3 transmission in the time slot can be indicated according to the time domain scheduling field in the Msg 2. Or, when determining the symbol position of Msg3 transmission in the time slot, or the time domain position of K repeated transmission or the HARQ retransmission period in the two modes, allocating from the time domain position of the time slot/repeated transmission or the tail of the HARQ period.

For example, the last symbol in a certain slot is OFDM symbol #13, and the length of Msg3 is 3 symbols, and the actual symbol positions of Msg3 are OFDM symbol #11,OFDM symbol#12 and OFDM symbol #13.

Optionally, the method 300 further includes:

the network equipment sends second indication information to the terminal equipment, the terminal equipment receives the second indication information sent by the network equipment, and the second indication information is used for indicating that the random access process message III is successfully received;

and the terminal equipment stops sending the random access procedure message III according to the second indication information.

Specifically, after determining that the maximum number of repeated transmissions of the Msg3 is K, the terminal device performs K repeated transmissions on the Msg3, and before the terminal device finishes transmitting K repeated transmissions, the network device may notify the terminal device that the Msg3 has been successfully received.

For example, the network device can tell the terminal device that Msg3 has been successfully transmitted through DCI without performing subsequent repetition; or if the terminal equipment does not receive the state indication, continuing to transmit by default; or, after the terminal device finishes sending the ACK/NACK fed back by the network device, the terminal device waits for the ACK/NACK fed back by the network device after sending the ACK/NACK for one or more times of repetition, and determines whether to continue subsequent sending.

It should be understood that in the embodiment of the present application, the frequency domain location sent by Msg3 may be indicated by other fields in Msg 2.

Optionally, the method 300 further includes:

after the random access procedure message III is sent, the terminal equipment receives the random access procedure message IV in the corresponding search space, thereby completing the random access procedure.

Fig. 8 shows a schematic flowchart of a communication method 400 provided in the embodiment of the present application, as shown in fig. 8, an execution body of the method 400 may be a terminal device, or may be a chip or an apparatus for the terminal device (the execution body is described below as an example of the terminal device), and the method 400 includes:

s410, the terminal equipment determines that the repeated sending times of the random access process message III is K, wherein K is a positive integer greater than or equal to 1;

S420, in the process of repeatedly sending K Msg3 to the network equipment, if the time domain position of the N-th repeated sending conflicts with the time domain position of the received downlink signal, the terminal equipment skips the N-th repeated sending, wherein N is a positive integer greater than or equal to 1 and less than or equal to K.

Specifically, the terminal device may determine that the number of repeated transmissions of the random access procedure message three (Msg 3) is K in any one of the foregoing methods 300, and then repeatedly transmit the Msg3 to the network device, where in the repeated transmission of K times, if the time domain position of the nth repeated transmission conflicts with the time domain position of the received downlink signal or the high priority signal, or the time domain position of the nth repeated transmission does not conflict with the time domain position of the received downlink signal or the high priority signal, but the time interval with the previous downlink signal or the high priority signal is not enough as a guard interval (for example, the guard interval includes the processing time of the terminal device, and/or the uplink/downlink switching time, etc.), the terminal device skips the nth repeated transmission.

In some possible implementations, the downlink signals may include one or more of downlink synchronization signal blocks (SS/PBCH blocks), remaining minimum system information (Remaining Minimum System Information, RMSI) control resource sets (Control Resource Set, CORESET), downlink signals (DL) in Semi-static/Semi-persistent uplink/downlink configuration (Semi-static DL/UL), and/or Flexible (Flexible) portions.

In some possible implementations, the high priority signal may include one or more of a physical random access channel (Physical Random Access Channel, PRACH), an uplink control channel (Physical Uplink Control Channel, PUCCH), an uplink sounding reference signal (Sounding Reference Signal, SRS), and a Reserved resource (Reserved).

Optionally, the method 400 further comprises:

after skipping the nth repetition transmission, the terminal device continues to transmit the random access procedure message three at the next available time domain location.

Optionally, the terminal device may further be referred to as sending a random access procedure message three at the next available time domain location: the terminal device sends Msg3 on the next available uplink resource.

It should be appreciated that the available uplink resources may be Uplink (UL) and/or Flexible (Flexible) portions, and that the available time domain location does not collide with a downlink signal or a high priority resource, while the available time domain location is spaced from a previous downlink signal by a guard interval (e.g., the guard interval includes a terminal device processing time, and/or an uplink/downlink handover time, etc.).

In particular, the terminal device may continue to transmit the Msg3 on the next available time domain position.

Optionally, the method 400 further comprises:

Optionally, the terminal device skips M repeated transmissions in the K repeated transmission processes, where M is a positive integer greater than or equal to 1 and less than or equal to K, and the method further includes:

Specifically, when the nth repetition transmission collides with the downlink signal transmission, the terminal device may consider that the repetition transmission is invalid/skip the repetition transmission, and in fact, the terminal device only transmits K-1 Msg3 at the time domain position of the K repetition transmission, and then the terminal device may transmit the Msg3 once again after completing the K repetition transmission, and finally, the terminal device also repeatedly transmits the Msg 3K times.

Optionally, the method 400 further comprises:

It should be understood that in the embodiment of the present application, the frequency hopping transmission refers to using a different frequency domain location each time Msg3 is repeatedly transmitted, which helps to obtain a frequency domain diversity gain.

It should be appreciated that the early end mechanism in the method 300 described above may also be utilized in the method 400, and will not be described here again for brevity.

The communication method of the embodiment of the present application is described in detail above with reference to fig. 1 to 8, and the communication device, the terminal device, and the network device of the embodiment of the present application are described in detail below with reference to fig. 9 to 12, and technical features described in the method embodiment are also applicable to the following apparatus embodiments.

Fig. 9 shows a schematic block diagram of a communication device 500 according to an embodiment of the present application, as shown in fig. 9, the communication device 500 comprising: a processing module 510 and a transceiver module 520.

The processing module 510 is configured to determine a first random access parameter, where the first random access parameter includes a number of repeated transmissions of a random access procedure message three and/or a first scaling factor, and the first scaling factor is a scaling factor of a transport block corresponding to the random access procedure message three;

the processing module 510 is further configured to control the transceiver module 520 to send the random access procedure message three to a network device according to the first random access parameter.

Optionally, the transceiver module 520 is further configured to receive a second random access procedure message sent by the network device, where the second random access procedure message includes a second random access parameter, and the second random access parameter includes a timing advance and/or a power control parameter, and the second random access parameter is associated with the first random access parameter;

the processing module 510 is specifically configured to:

and determining the first random access parameter according to the second random access parameter.

Optionally, the transceiver module 520 is further configured to send a random access procedure message one to the network device, where a format of the random access procedure message one is associated with the first random access parameter;

the processing module 510 is specifically configured to:

the first random access parameter is determined according to the format of the random access procedure message one.

Optionally, the transceiver module 520 is further configured to receive a second random access procedure message sent by the network device;

the processing module 510 is specifically configured to:

and determining the first expansion factor according to a second expansion factor, wherein the second expansion factor is the expansion factor of the transmission block corresponding to the second random access process message.

Optionally, the first scaling factor is less than or equal to the second scaling factor.

Optionally, the processing module 510 is further configured to determine a time domain position and a hybrid automatic repeat request HARQ retransmission period of K repeated transmissions, where K is the number of repeated transmissions, and K is a positive integer greater than or equal to 1, and the time of the K repeated transmissions is less than one HARQ retransmission period.

Optionally, the transceiver module 520 is further configured to receive first indication information sent by the network device, where the first indication information is used to indicate an offset value of the time domain location of the K repeated transmissions in the HARQ period.

Optionally, the time domain position of the K repeated transmissions includes a time slot position of each transmission in the K repeated transmissions, and the processing module 510 is further configured to determine a symbol position of each transmission in the time slot position of each transmission.

Optionally, the time domain position of the nth repetition transmission in the K repetition transmissions conflicts with the time domain position of the received downlink signal or the high priority signal, or the time domain position of the nth repetition transmission does not conflict with the time domain position of the received downlink signal or the high priority signal, but the time interval between the nth repetition transmission and the time interval of the received previous downlink signal or the high priority signal is not enough as a guard interval, N is a positive integer greater than or equal to 1 and less than or equal to K, and the processing module 510 is further configured to control the transceiver module 520 to skip the nth repetition transmission.

Optionally, the transceiver module 520 is further configured to send the random access procedure message three once again after the K repeated transmissions are completed.

Optionally, the transceiver module 520 is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate that the random access procedure message three is received successfully;

the processing module 510 is further configured to control the transceiver module 520 to stop sending the random access procedure message three according to the second indication information.

Specifically, the communication apparatus 500 may correspond to a terminal device in the communication method 300 of the embodiment of the present application, and the communication apparatus 500 may include a module (or unit) for performing a method performed by the terminal device of the communication method 300 in fig. 5. Also, each module (or unit) in the communication device 500 and the other operations and/or functions described above are respectively for implementing the corresponding flow of the communication method 300 in fig. 5. The specific process of each module (or unit) performing the corresponding steps described above is described in detail in the method 300, and is not described herein for brevity.

It should be understood that the communication device 500 may be a terminal device, or may be a chip or a functional unit in the terminal device.

Fig. 10 shows a schematic block diagram of a communication device 600 according to an embodiment of the present application, as shown in fig. 10, the communication device 600 comprising: a processing module 610 and a transceiver module 620.

The processing module 610 is configured to determine a first random access parameter, where the first random access parameter includes a number of repeated transmissions of a random access procedure message three and/or a first scaling factor, and the first scaling factor is a scaling factor of a transport block corresponding to the random access procedure message three;

the transceiver module 620 is configured to receive the random access procedure message three sent by the terminal device according to the first random access parameter.

Optionally, the transceiver module 620 is further configured to receive a random access procedure message one sent by the terminal device;

the processing module 610 is further configured to determine a second random access parameter according to the first random access procedure message, where the second random access parameter includes a timing advance and/or a power control parameter, and the second random access parameter is associated with the first random access parameter;

the processing module 610 is specifically configured to:

Optionally, the transceiver module 620 is further configured to receive a first random access procedure message sent by the terminal device, where a format of the first random access procedure message is associated with the first random access parameter;

The processing module 610 is specifically configured to:

the processing module 610 is further configured to determine a second scaling factor according to the first random access procedure message, where the second scaling factor is a scaling factor of a transport block corresponding to the second random access procedure message;

the processing module 610 is specifically configured to:

the first scaling factor is determined based on the second scaling factor.

Specifically, the communication apparatus 600 may correspond to a network device in the communication method 300 of the embodiment of the present application, and the communication apparatus 600 may include a module (or unit) for performing a method performed by the network device of the communication method 300 in fig. 5. Also, each module (or unit) in the communication device 600 and the other operations and/or functions described above are respectively for implementing the corresponding flow of the communication method 300 in fig. 5. The specific process of each module (or unit) performing the corresponding steps described above is described in detail in the method 300, and is not described herein for brevity.

It should be understood that the communication apparatus 600 may be a network device, or may be a chip or a functional unit in the network device.

It should be understood that the division of the modules (or units) in the above apparatus is merely a division of logic functions, and may be fully or partially integrated into one physical entity or may be physically separated. And the modules (or units) in the apparatus may all be implemented in the form of software calls via the processing elements; or can be realized in hardware; it is also possible that part of the modules (or units) are implemented in the form of software, which is called by means of a processing element, and part of the modules (or units) are implemented in the form of hardware. For example, each module (or unit) may be a processing element that is set up separately, may be implemented in a chip of the apparatus, or may be stored in a memory in the form of a program, and the function of the module (or unit) may be called and executed by a processing element of the apparatus. Furthermore, all or part of these modules (or units) may be integrated together or may be implemented independently. The processing element described herein may in turn be a processor, which may be an integrated circuit with signal processing capabilities. In implementation, each step of the above method or each module (or unit) may be implemented by an integrated logic circuit of hardware in a processor element or implemented in the form of software called by the processing element.

In one example, a module (or unit) in any of the above apparatuses may be one or more integrated circuits configured to implement the above methods, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC), or one or more microprocessors (digital singnal processor, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), or a combination of at least two of these integrated circuit forms. For another example, when a module (or unit) in an apparatus may be implemented in the form of a scheduler of processing elements, the processing elements may be general purpose processors, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke a program. For another example, the modules (or units) may be integrated together and implemented in the form of a system-on-a-chip (SOC).

The above transceiver module (or unit) is an interface circuit of the device, which is used to receive signals from other devices, and may also be used to send signals to other devices. For example, when the device is implemented as a chip, the transceiver module is an interface circuit of the chip for receiving signals from other chips or devices, or may be an interface circuit of the device for transmitting signals to other devices. For example, when the device is implemented as a chip, the transceiver module may be an interface circuit of the chip for transmitting signals to other chips or devices.

Fig. 11 shows a schematic structural diagram of a terminal device provided in an embodiment of the present application. Which may be the terminal device in the above embodiment, for implementing the operation of the terminal device in the above embodiment. As shown in fig. 11, the terminal includes: an antenna 710, a radio frequency part 720, a signal processing part 730. The antenna 710 is connected to the radio frequency part 720. In the downlink direction, the radio frequency part 720 receives information transmitted by the network device through the antenna 710, and transmits the information transmitted by the network device to the signal processing part 730 for processing. In the uplink direction, the signal processing part 730 processes information of the terminal device and transmits the processed information to the radio frequency part 720, and the radio frequency part 720 processes information of the terminal device and transmits the processed information to the network device through the antenna 710.

The signal processing part 730 may include a modem subsystem for implementing processing of the data communication protocol layers; the system also comprises a central processing subsystem for realizing the processing of the terminal equipment operating system and the application layer; in addition, other subsystems, such as a multimedia subsystem for enabling control of a terminal camera, screen display, etc., a peripheral subsystem for enabling connection with other devices, etc., may also be included. The modem subsystem may be a separately provided chip. Alternatively, the above means for a terminal device may be located in the modem subsystem.

The modem subsystem may include one or more processing elements 731, including, for example, a host CPU and other integrated circuits. In addition, the modulation and demodulation subsystem may also include a storage element 732 and an interface circuit 733. The storage element 732 is used for storing data and programs, but the programs for executing the methods executed by the terminal device in the above methods may not be stored in the storage element 732, but in a memory outside the modulation and demodulation subsystem, which is loaded for use when in use. The interface circuit 733 is used to communicate with other subsystems. The above means for a terminal device may be located in a modem subsystem which may be implemented by a chip comprising at least one processing element for performing the steps of any of the methods performed by the above terminal and interface circuitry for communicating with other means. In one implementation, the unit of the terminal implementing each step in the above method may be implemented in the form of a processing element scheduler, for example, the apparatus for a terminal device includes a processing element and a storage element, and the processing element invokes the program stored in the storage element to perform the method performed by the terminal device in the above method embodiment. The memory element may be a memory element where the processing element is on the same chip, i.e. an on-chip memory element.

In another implementation, the program for executing the method executed by the terminal device in the above method may be a storage element on a different chip than the processing element, i.e. an off-chip storage element. At this time, the processing element calls or loads a program from the off-chip storage element on the on-chip storage element to call and execute the method executed by the terminal device in the above method embodiment.

In yet another implementation, the unit of the terminal device implementing the steps of the above method may be configured as one or more processing elements, which are disposed on the modem subsystem, where the processing elements may be integrated circuits, for example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits may be integrated together to form a chip.

The units of the terminal device implementing the steps of the above method may be integrated together and implemented in the form of a system-on-a-chip (SOC) chip for implementing the above method. At least one processing element and a storage element can be integrated in the chip, and the processing element invokes the stored program of the storage element to implement the method executed by the terminal device; alternatively, at least one integrated circuit may be integrated in the chip for implementing the method performed by the above terminal device; alternatively, the functions of the partial units may be implemented in the form of a processing element calling program, and the functions of the partial units may be implemented in the form of an integrated circuit, in combination with the above implementations.

It will be seen that the above apparatus for a terminal device may comprise at least one processing element and interface circuitry, wherein the at least one processing element is adapted to perform any of the methods performed by the terminal device provided by the above method embodiments. The processing element may be configured in a first manner: that is, a part or all of the steps executed by the terminal device are executed in a manner of calling the program stored in the storage element; the second way is also possible: i.e. by means of integrated logic circuitry of hardware in the processor element in combination with instructions to perform part or all of the steps performed by the terminal device; of course, it is also possible to perform part or all of the steps performed by the terminal device in combination with the first and second modes.

The processing element herein, as described above, may be a general purpose processor, such as a CPU, or one or more integrated circuits configured to implement the above methods, such as: one or more ASICs, or one or more microprocessor DSPs, or one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.

The memory element may be one memory or may be a collective term for a plurality of memory elements.

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application. For implementing the operations of the network device in the above embodiments. As shown in fig. 1, the network device includes: an antenna 801, a radio frequency device 802, and a baseband device 803. The antenna 801 is connected to a radio frequency device 802. In the uplink direction, the radio frequency device 802 receives information transmitted from the terminal device via the antenna 801, and transmits the information transmitted from the terminal device to the baseband device 803 for processing. In the downlink direction, the baseband device 803 processes information of the terminal device and sends the processed information to the radio frequency device 802, and the radio frequency device 802 processes information of the terminal device and sends the processed information to the terminal device through the antenna 801.

The baseband apparatus 803 may include one or more processing elements 8031, including, for example, a master CPU and other integrated circuits. In addition, the baseband device 803 may further include a storage element 8032 and an interface 8033, the storage element 8032 being used for storing programs and data; the interface 8033 is used to interact with the radio frequency device 802, for example, a common public radio interface (common public radio interface, CPRI). The above means for network device may be located in the baseband means 803, e.g. the above means for network device may be a chip on the baseband means 803 comprising at least one processing element for performing the steps of any one of the methods performed by the above network device and interface circuitry for communicating with other means. In one implementation, the units of the network device implementing the steps in the above method may be implemented in the form of a processing element scheduler, for example, an apparatus for a network device includes a processing element and a storage element, where the processing element invokes the program stored in the storage element to perform the method performed by the network device in the above method embodiment. The memory elements may be memory elements on the same chip as the processing elements, i.e., on-chip memory elements, or may be memory elements on a different chip than the processing elements, i.e., off-chip memory elements.

In another implementation, the units of the network device implementing the steps of the above method may be configured as one or more processing elements, which are disposed on the baseband apparatus, where the processing elements may be integrated circuits, for example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits may be integrated together to form a chip.

The units of the network device implementing the steps of the above method may be integrated together and implemented in the form of a system-on-a-chip (SOC), e.g. the baseband device comprises the SOC chip for implementing the above method. At least one processing element and a storage element can be integrated in the chip, and the processing element invokes the stored program of the storage element to implement the method executed by the above network device; alternatively, at least one integrated circuit may be integrated within the chip for implementing the method performed by the above network device; alternatively, the functions of the partial units may be implemented in the form of a processing element calling program, and the functions of the partial units may be implemented in the form of an integrated circuit, in combination with the above implementations.

It will be seen that the above apparatus for a network device may comprise at least one processing element and interface circuitry, wherein the at least one processing element is adapted to perform any of the methods performed by the network device provided by the above method embodiments. The processing element may be configured in a first manner: that is, a part or all of the steps executed by the network device are executed in a manner of calling the program stored in the storage element; the second way is also possible: i.e. by means of integrated logic circuitry of hardware in the processor element in combination with instructions to perform part or all of the steps performed by the network device; of course, some or all of the steps performed by the above network device may also be performed in combination with the first and second modes.

The terminal device and the network device in the above respective apparatus embodiments may correspond completely to the terminal device or the network device in the method embodiments, and the respective steps are performed by respective modules or units, for example, the transceiver module includes a transmitting module and a receiving module, the transmitting module (transmitter) may perform the steps of transmitting in the method embodiments, the receiving module (receiver) may perform the steps of receiving in the method embodiments, and other steps than transmitting and receiving may be performed by the processing module (processor). Reference may be made to corresponding method embodiments for the function of a particular module. The transmitting module and the receiving module can form a transmitting-receiving module, the transmitter and the receiver can form a transceiver, and the transmitting-receiving function is realized together; the processor may be one or more.

The embodiment of the application also provides a communication system, which comprises: the terminal device and/or the network device.

In the embodiments of the present application, it should be noted that the method embodiments described in the embodiments of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application 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 a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In addition, the terms "system" and "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It should be understood that in the embodiments of the present application, "B corresponding to a" means that B is associated with a, from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

The terms "first," "second," and the like in this application are used merely to distinguish between different objects, and the terms "first," "second," and the like do not per se limit the actual order or function of the modified objects. The appearances of the phrases "in an exemplary," "in an example," "for example," "in an alternative design," or "in a design" in the specification are only intended to be exemplary, illustrative, or explanatory. Any embodiment or design described herein as "exemplary," "example," "for example," "alternative design," or "one design" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of these words is intended to present the relevant concepts in a concrete fashion.

The terms "upstream" and "downstream" as used herein are used to describe the direction of data/information transmission in a specific scenario, for example, the "upstream" direction generally refers to the direction in which data/information is transmitted from a terminal device to a network side, or the direction in which a distributed unit is transmitted to a centralized unit, and the "downstream" direction generally refers to the direction in which data/information is transmitted from the network side to the terminal device, or the direction in which a centralized unit is transmitted to a distributed unit.

The appearances of the phrase "including at least one of the following" in this application are not necessarily all referring to: the meaning of the expressions a, B, and C "generally means that the item may be any one of the following unless otherwise specified: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; a, B and C; a and A; a, A and A; a, A and B; a, a and C, a, B and B; a, C and C; b and B, B and C, C and C; c, C and C, and other combinations of a, B and C. The above is an optional entry for the item exemplified by 3 elements a, B and C, when the expression "the item includes at least one of the following: a, B, … …, and X ", i.e. when there are more elements in the expression, then the entry to which the item is applicable can also be obtained according to the rules described above.

Various objects such as various messages/information/devices/network elements/systems/devices/actions/operations/processes/concepts may be named in the present application, and it should be understood that these specific names do not constitute limitations on related objects, and that the named names may be changed according to the scenario, context, or usage habit, etc., and understanding of technical meaning of technical terms in the present application should be mainly determined from functions and technical effects that are embodied/performed in the technical solution.

The architecture of CU and DU in the embodiment of the present application is not limited to 5G NR gNB, but may also be applied to a scenario where an LTE base station is divided into CU and DU; the CU may be further divided into two parts, CP and UP. Optionally, in the case of an LTE base station, the protocol layer does not include an SDAP layer.

The network architecture and the service scenario described in the embodiments of the present application are for the convenience of readers to clearly understand the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application, and those of ordinary skill in the art can know that, with the evolution of the network architecture and the appearance of a new service scenario, the technical solutions provided in the embodiments of the present application are applicable to similar technical problems.

In the above embodiments, the implementation 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 may include 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 from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital Subscriber (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. 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., a floppy Disk, a hard Disk, a magnetic Disk), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

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 in this 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 each embodiment 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.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

determining a first random access parameter, wherein the first random access parameter comprises repeated sending times of a random access process message III and/or a first expansion factor, and the first expansion factor is an expansion factor of a transmission block corresponding to the random access process message III;

transmitting the random access procedure message three to a network device according to the first random access parameter,

wherein said determining the first random access parameter comprises:

receiving a second random access procedure message sent by the network equipment, wherein the second random access procedure message comprises a second random access parameter, the second random access parameter comprises a timing advance and/or a power control parameter, the second random access parameter is associated with the first random access parameter, and the first random access parameter is determined according to the second random access parameter, or

Transmitting a first random access procedure message to the network device, the first random access procedure message having a format associated with the first random access parameter, determining the first random access parameter based on the first random access procedure message, or

And receiving a random access process message II sent by the network equipment, and determining the first expansion factor according to a second expansion factor, wherein the second expansion factor is an expansion factor of a transmission block corresponding to the random access process message II.

2. The method of claim 1, wherein the first scaling factor is less than or equal to the second scaling factor.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. A method according to claim 3, characterized in that the method further comprises:

and receiving first indication information sent by the network equipment, wherein the first indication information is used for indicating an offset value of the time domain position of the K times of repeated transmission in the HARQ period.

5. The method of claim 3, wherein the time-domain locations of the K repeated transmissions comprise slot locations for each of the K repeated transmissions, the method further comprising:

in the time slot position of each transmission, determining the symbol position of each transmission.

6. The method according to claim 3, wherein N is a positive integer of 1 or more and K or less in the case where a time domain position of an nth repetition transmission among the K repetition transmissions collides with a time domain position of a received downlink signal or a high priority signal or a time interval of the nth repetition transmission with a time interval of a received previous downlink signal or a high priority signal is insufficient as a guard interval, the method further comprising:

and skipping the Nth repeated transmission.

7. A method of communication, comprising:

the receiving terminal device sends the random access procedure message three according to the first random access parameter,

Wherein said determining the first random access parameter comprises:

receiving a random access procedure message I sent by a terminal device, determining a second random access parameter according to the random access procedure message I, wherein the second random access parameter comprises a timing advance and/or a power control parameter, the second random access parameter is associated with the first random access parameter, and the first random access parameter is determined according to the second random access parameter, or

Receiving a first random access procedure message sent by a terminal device, wherein the format of the first random access procedure message is associated with the first random access parameter, and determining the first random access parameter according to the format of the first random access procedure message, or

And receiving a random access procedure message I sent by the terminal equipment, determining a second expansion factor according to the random access procedure message I, wherein the second expansion factor is an expansion factor of a transmission block corresponding to the random access procedure message II, and determining the first expansion factor according to the second expansion factor.

8. The method of claim 7, wherein the first scaling factor is less than or equal to the second scaling factor.

9. A communication device is characterized by comprising a processing module and a receiving and transmitting module, wherein,

the processing module is configured to determine a first random access parameter, where the first random access parameter includes a number of repeated transmissions of a random access procedure message three and/or a first scaling factor, and the first scaling factor is a scaling factor of a transport block corresponding to the random access procedure message three;

the processing module is further configured to control the transceiver module to send the random access procedure message three to a network device according to the first random access parameter,

wherein the processing module is configured to determine a first random access parameter, including:

the transceiver module is configured to receive a second random access procedure message sent by the network device, where the second random access procedure message includes a second random access parameter, the second random access parameter includes a timing advance and/or a power control parameter, the second random access parameter is associated with the first random access parameter, and the processing module determines the first random access parameter according to the second random access parameter, or

The transceiver module is configured to send a first random access procedure message to the network device, where a format of the first random access procedure message is associated with the first random access parameter, and the processing module determines the first random access parameter according to the format of the first random access procedure message, or

The receiving and transmitting module is configured to receive a second random access procedure message sent by the network device, and the processing module determines the first scaling factor according to a second scaling factor, where the second scaling factor is a scaling factor of a transport block corresponding to the second random access procedure message.

10. The communication apparatus of claim 9, wherein the first scaling factor is less than or equal to the second scaling factor.

11. The communication apparatus according to claim 9 or 10, wherein the processing module is further configured to determine a time domain position and a hybrid automatic repeat request, HARQ, retransmission period for K repeated transmissions, K being the number of repeated transmissions, K being a positive integer greater than or equal to 1, wherein the time of the K repeated transmissions is less than one HARQ retransmission period.

12. The communications apparatus of claim 11, wherein the transceiver module is further configured to receive first indication information sent by the network device, the first indication information being configured to indicate an offset value of a time domain position of the K repeated transmissions in the HARQ period.

13. The communications apparatus of claim 11, wherein the time domain locations of the K repeated transmissions comprise slot locations of each of the K repeated transmissions, and wherein the processing module is further configured to determine a symbol location of each of the transmissions in the slot locations of each of the transmissions.

14. The communication apparatus according to claim 11, wherein in the case where a time domain position of an nth retransmission among the K repeated transmissions collides with a time domain position of a received downlink signal or a high priority signal, or a time interval between the time domain position of the nth retransmission and a time interval of a received previous downlink signal or a high priority signal is insufficient as a guard interval, N is a positive integer greater than or equal to 1 and less than or equal to K, the processing module is further configured to control the transceiver module to skip the nth retransmission.

15. A communication device is characterized by comprising a processing module and a receiving and transmitting module, wherein,

the transceiver module is configured to receive the random access procedure message three sent by the terminal device according to the first random access parameter,

The transceiver module is configured to receive a first random access procedure message sent by a terminal device, the processing module is further configured to determine a second random access parameter according to the first random access procedure message, the second random access parameter includes a timing advance and/or a power control parameter, the second random access parameter is associated with the first random access parameter, and the processing module is configured to determine the first random access parameter according to the second random access parameter, or

The transceiver module is configured to receive a first random access procedure message sent by a terminal device, where a format of the first random access procedure message is associated with the first random access parameter, and the processing module determines the first random access parameter according to the format of the first random access procedure message, or

The receiving and transmitting module is used for receiving a first random access process message sent by the terminal equipment, the processing module is also used for determining a second expansion factor according to the first random access process message, the second expansion factor is an expansion factor of a transmission block corresponding to the second random access process message, and the processing module is used for determining the first expansion factor according to the second expansion factor.

16. The communication apparatus of claim 15, wherein the first scaling factor is less than or equal to the second scaling factor.

17. A storage medium comprising a program which, when executed by a processor, performs the method of any of claims 1-8.