CN109152080B

CN109152080B - Random access response method, network equipment and terminal equipment

Info

Publication number: CN109152080B
Application number: CN201710456553.1A
Authority: CN
Inventors: 颜矛; 文荣; 陈磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-06-16
Filing date: 2017-06-16
Publication date: 2023-11-03
Anticipated expiration: 2037-06-16
Also published as: CN109152080A

Abstract

The application discloses a random access response method, network equipment and terminal equipment. The method comprises the following steps: the network equipment sends a random access response to the terminal equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6. Corresponding network equipment and terminal equipment are also disclosed. By adopting the technical scheme of the application, the MAC PDU can comprise the index field of the random access preamble with more than 6 bits and/or the index field of the random access resource, thereby supporting more random access preambles or random access resources.

Description

Random access response method, network equipment and terminal equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a random access response method, a network device, and a terminal device.

Background

In a long term evolution (long term evolution, LTE) system, a Random Access (RA) procedure and a random access response flow are shown in fig. 1. In random access, the terminal device first transmits a random access preamble to the network device, wherein the preamble carries a preamble sequence, and the preamble sequence distinguishes the terminal device in random access, estimating a time delay amount. LTE defines a plurality of preamble formats, each of which has a different time length, and the preamble format used by the current network is specified in downlink system information. In a cell of LTE, there are 64 random access preamble sequences. In LTE, the terminal device needs to wait for receiving a random access response of the network device after sending one random access preamble. And then further information interaction (e.g. message 3) is performed as shown in fig. 1.

The medium access control (medium access control, MAC) protocol data unit (protocol data unit, PDU) format for random access response in LTE is shown in fig. 2. The MAC PDU of the random access response includes two parts, namely a MAC header and a payload. The MAC header is in turn made up of a number of sub-headers, each of one byte (8 bits) in length. One of the sub-heads is used for an indication of information (the sub-head is used for carrying a back-off indication, the sub-head is optional) and the other sub-heads are used for random access response (random access response, RAR). The load contains the specific content of the random access response. The sub-header for the RAR in the MAC header corresponds one-to-one with the RAR in the load. The RAR sub-header consists of three fields, respectively, the first two fields (extension (E), type (T), as indication bits for indicating the effect of the subsequent byte and the sub-header type, respectively, and a random access preamble index (random access preamble id, RAPID) field of 6 bits, wherein 6 bits indicate the random access preamble index.

In the next generation wireless communication network, a beam forming technology is adopted, and energy of each beam signal is limited in a certain area, so that a network device transmits a plurality of downlink signals for realizing full coverage of cells. As shown in fig. 3, each downlink signal may be associated with one or more random access resources/preambles. While a downlink beam coverage area may have multiple terminal devices performing random access using the beam-associated random access resources/preambles. The random access resource/preamble amount is too small resulting in a higher collision probability. Therefore, in order to keep the collision probability relatively low, NR has a higher requirement on the number of random access preambles or random access resources, and the number of preambles may exceed 64 or have multiple time and frequency resources. In LTE, a 6-bit RAPID corresponds to a maximum of 64 random access preambles or preamble sequences that cannot be satisfied. Therefore, it is desirable to provide a scheme that supports more random access resources/preambles.

Disclosure of Invention

The application provides a random access response method, network equipment and terminal equipment, which are used for supporting more random access resources/preambles.

In one aspect of the present application, there is provided a random access response method, including: the network equipment sends a random access response to the terminal equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6. In this implementation, an index field of a random access preamble and/or an index field of a random access resource with more than 6 bits may be included in the MAC PDU, so as to support more random access preambles or random access resources, and when a plurality of terminal devices access a network device, collision probability may be reduced.

In another aspect of the present application, there is provided a random access response method, including: the terminal equipment receives a random access response from the network equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6. In this implementation, an index field of a random access preamble and/or an index field of a random access resource with more than 6 bits may be included in the MAC PDU, so as to support more random access preambles or random access resources, and when a plurality of terminal devices access a network device, collision probability may be reduced.

In a possible implementation manner, the MAC PDU further includes a time index and/or a frequency index of a random access preamble or a random access preamble sequence detected by the network device, where the time index is located in at least one random access response sub-header and/or load, and the frequency index is located in at least one random access response sub-header and/or load; after receiving the random access response from the network device, the terminal device further includes: and the terminal equipment analyzes the MAC PDU of the random access response, and obtains the random access response aiming at the terminal equipment according to the time index and/or the frequency index of the random access preamble or the random access preamble sequence sent by the terminal equipment. In this implementation, for the preamble index or preamble sequence index corresponding to the same random access resource in each time-frequency position, the random access resource is further differentiated by the time index and/or the frequency index.

In combination with the one aspect and the other aspect of the present application, in one possible implementation manner, the MAC PDU of the random access response includes a MAC header and a payload, and the MAC header includes at least one random access response sub-header; the random access preamble index field and/or the index field of the random access resource is located in the at least one random access response sub-header. In this implementation, the random access preamble index field and/or the index field of the random access resource is located in the random access response sub-header.

In combination with the one aspect and the other aspect of the present application, in another possible implementation manner, the MAC PDU of the random access response includes a MAC header and a payload, and the MAC header includes at least one random access response sub-header; the index field of the random access preamble is located in the at least one random access response sub-header and the load; or the index field of the random access resource is located in the at least one random access response subheader and the load; or the index field of the random access preamble and the index field of the random access resource are located in the at least one random access response sub-header and the payload. In this implementation, the index field of the random access preamble and/or the index field of the random access resource are located in the random access response sub-header and the payload.

In combination with the one aspect and the other aspect of the present application, in still another possible implementation manner, the index field of the random access preamble and/or the index field of the random access resource are located in the load of the random access response.

In combination with the one aspect and the other aspect of the present application, in still another possible implementation manner, the random access preamble includes at least one random access preamble sequence, and the random access preamble index field includes an index field of the at least one random access preamble sequence. In this implementation, the random access preamble index field further includes an index field of the random access preamble sequence.

In combination with the one aspect and the other aspect of the present application, in a further possible implementation manner, the MAC PDU further includes a time index and/or a frequency index of the random access preamble or the random access preamble sequence detected by the network device, where the time index is located in at least one random access response sub-header and/or load, and the frequency index is located in at least one random access response sub-header and/or load. In this implementation, for the preamble index or preamble sequence index corresponding to the same random access resource in each time-frequency position, the random access resource is further differentiated by the time index and/or the frequency index.

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

In a possible implementation manner, the network device includes: and the sending unit is used for sending a random access response to the terminal equipment, wherein the media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6.

In another possible implementation manner, the network device includes: a receiver, a transmitter, a memory, and a processor; wherein the memory stores a set of program code and the processor is configured to invoke the program code stored in the memory to perform the following operations: and sending a random access response to the terminal equipment through the transmitter, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6.

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

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

In a possible implementation manner, the terminal device includes: a receiving unit, configured to receive a random access response from a network device, where a medium access control layer protocol data unit MAC PDU of the random access response includes an index field of a k-bit random access preamble and/or an index field of a random access resource, where k is a positive integer greater than 6.

In another possible implementation manner, the terminal device includes: a receiver, a transmitter, a memory, and a processor; wherein the memory stores a set of program code and the processor is configured to invoke the program code stored in the memory to perform the following operations: and receiving, by the receiver, a random access response from the network device, wherein a medium access control layer protocol data unit, MAC, PDU of the random access response includes an index field of a k-bit random access preamble and/or an index field of a random access resource, where k is a positive integer greater than 6.

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

In yet another aspect of the present application, there is provided a random access response method, including: the network equipment sends a random access response to the terminal equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an MAC header and a load, the MAC header comprises at least one information sub-header, and the information sub-header comprises at least one field as follows: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information. In this implementation, more information may be indicated in the MAC subheader.

In yet another aspect of the present application, there is provided a random access response method, including: the terminal equipment receives a random access response from the network equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises a MAC header and a load, the MAC header comprises at least one information sub-header, and the information sub-header comprises at least one field as follows: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information. In this implementation, more information may be indicated in the MAC subheader.

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

In a possible implementation manner, the network device includes: a sending unit, configured to send a random access response to a terminal device, where a medium access control layer protocol data unit MAC PDU of the random access response includes a MAC header and a payload, where the MAC header includes at least one information sub-header, and the information sub-header includes at least one field as follows: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information.

In another possible implementation manner, the network device includes: a receiver, a transmitter, a memory, and a processor; wherein the memory stores a set of program code and the processor is configured to invoke the program code stored in the memory to perform the following operations: transmitting, by the transmitter, a random access response to the terminal device, wherein a medium access control layer protocol data unit MAC PDU of the random access response includes a MAC header and a payload, the MAC header includes at least one information sub-header, and the information sub-header includes at least one field of: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information.

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

In a possible implementation manner, the terminal device includes: a receiving unit, configured to receive a random access response from a network device, where a medium access control layer protocol data unit MAC PDU of the random access response includes a MAC header and a payload, where the MAC header includes at least one information sub-header, and the information sub-header includes at least one field of: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information.

In another possible implementation manner, the terminal device includes: a receiver, a transmitter, a memory, and a processor; wherein the memory stores a set of program code and the processor is configured to invoke the program code stored in the memory to perform the following operations: receiving, by the receiver, a random access response from a network device, wherein a medium access control layer protocol data unit, MAC PDU, of the random access response includes a MAC header and a payload, the MAC header including at least one information sub-header, wherein the information sub-header includes at least one field of: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information; wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information.

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

A further aspect of the application provides a communication chip having instructions stored therein which, when run on a network device or terminal device, cause a computer to perform the method of the above aspects.

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

Drawings

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

Fig. 1 is a schematic diagram of a random access and random access response flow;

fig. 2 is a schematic format diagram of a medium access control protocol data unit of a random access response in LTE;

fig. 3 is a schematic diagram of a relationship between a downlink signal and a random access resource, and a preamble;

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

Fig. 5 is an interaction flow chart of a random access response provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of a MAC PDU format of a random access response according to an embodiment of the present invention;

fig. 7 is a diagram of random access resource and random access preamble reception in a multi-beam communication network;

fig. 8 is an interactive flow diagram of another method for random access response according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a MAC PDU format of another random access response according to an embodiment of the present invention;

fig. 10 is a schematic block diagram of a network device according to an embodiment of the present invention;

fig. 11 is a schematic block diagram of a terminal device according to an embodiment of the present invention;

fig. 12 is a schematic block diagram of another network device according to an embodiment of the present invention;

fig. 13 is a schematic block diagram of another terminal device according to an embodiment of the present invention;

fig. 14 is a schematic hardware architecture diagram of a terminal device/network device according to an embodiment of the present invention.

Detailed Description

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

Referring to fig. 4, fig. 4 is a schematic diagram of a communication system architecture according to an embodiment of the present invention. The communication system includes a network device and a terminal device. The communication system may be a global system for mobile communications (global system for mobile communication, GSM), a code division multiple access (code division multiple access, CDMA) system, a wideband code division multiple access (wideband code division multiple access, WCDMA) system, a worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) system, an LTE system, a 5G communication system (e.g., a new radio, NR) system, a communication system in which multiple communication technologies are integrated (e.g., a communication system in which LTE technology and NR technology are integrated), or a subsequent evolution communication system.

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

The network device of the present application is a device deployed in a radio access network to provide wireless communication functions, including but not limited to: a base station (e.g., BTS (base transceiver station), nodeB (NB), evolved nodeB (evolutional node B, eNB or eNodeB), transmission node or transceiver point (transmission reception point, TRP or TP) in an NR system, or next generation nodeB (gNB), base station or network equipment in a future communication network), relay station, access point, in-vehicle device, wearable device, wireless-fidelity (Wi-Fi) site, wireless backhaul node, small station, micro station, etc.

Taking a network device as an example of a base station, in fig. 4, the base station 102 may include multiple antenna groups. Each antenna group may include one or more antennas, e.g., one antenna group may include antennas 104 and 106, another antenna group may include antennas 108 and 110, and an additional group may be included that may include antennas 112 and 114. Different antenna groups in high frequency communication may be combined into different antenna planes (panels), for example, one of the antenna groups forms a beam pointing in one direction and the other antenna group forms another beam pointing in the other direction, while more antennas may be required to fit different device capabilities, so that the additional groups may be provided with different numbers of antennas depending on the different device capabilities. Illustratively, 2 antennas are shown in fig. 4 for each antenna group, however, more or fewer antennas may be utilized for each group. Base station 102 can additionally comprise a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception, such as processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc., as will be appreciated by one skilled in the art.

Base station 102 may communicate with one or more terminal devices, such as terminal device 116 and terminal device 122. However, it is to be appreciated that base station 102 can communicate with any number of terminal devices similar to terminal devices 116 or 122. As shown in fig. 1, terminal device 116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126. In a frequency division duplex (frequency division duplex, FDD) system, forward link 118 can utilize a different frequency band than that used by reverse link 120, and forward link 124 can utilize a different frequency band than that used by reverse link 126, for example. Further, in a time division duplex (time division duplex, TDD) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.

The area covered by each set of antennas designed for communication and/or the area covered by the transmission is referred to as a sector of base station 102. For example, antenna groups can be designed to communicate to terminal devices in a sector of the areas covered by base station 102. During communication of base station 102 with terminal devices 116 and 122 via forward links 118 and 124, respectively, the transmit antennas of base station 102 can utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124. In addition, mobile nodes in neighboring cells may experience less interference when base station 102 transmits signals to randomly dispersed terminal devices 116 and 122 in the associated coverage area using beamforming as compared to the manner in which a base station transmits signals to all its access terminal devices through a single antenna.

At a given time, base station 102, terminal device 116, or terminal device 122 can be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting apparatus may acquire, e.g., generate, receive from other communication apparatuses, or save in memory, etc., a certain number of data bits to be transmitted to the wireless communication receiving apparatus through the channel. Such data bits may be contained in a transport block or blocks of data, which may be segmented to produce a plurality of code blocks.

In a next generation mobile communication system such as a new radio communication system (NR), a network device uses a plurality of transmission beams to realize full coverage for downlink data transmission; likewise, the network device utilizes multiple receive beams to achieve full coverage of the uplink data transmission, which is referred to as a multi-beam communication network. In a specific example, the uplink/downlink signal may be a synchronization signal block (synchronization signal block, SS block). One downlink signal corresponds to one transmit beam. The network device may associate an independent random access resource and random access preamble with each downlink signal, and the downlink signal may associate multiple random access resources. When the network device receives a random access preamble on a random access resource associated with a downlink signal k, it sends a random access response by using a sending beam corresponding to the downlink signal k. The plurality of uplink/downlink signals form an uplink/downlink signal group, or referred to as an uplink/downlink signal burst (in a specific example, the uplink/downlink signal burst may be SS burst), and the plurality of uplink/downlink signal groups that implement complete coverage are referred to as an uplink/downlink signal burst set (in a specific example, the uplink/downlink signal burst set may be SS burst set).

Referring to fig. 5, fig. 5 is an interaction flow chart of a random access response according to an embodiment of the present invention, and the method may include the following steps:

s101, a network device sends a random access response to a terminal device, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6.

The terminal device receives a random access response from the network device.

Before S101, the terminal device sends a request to the network device, where the request is used to initiate random access, and the request may be called a random access request message, a message 1, a random access preamble, or other custom names, which are not limited herein. The embodiment of the invention is described by a random access preamble example. At S101, the response is used to respond to the request, which may be referred to as a random access response message, message 2, or other custom name, which is not limited herein. Embodiments of the present invention are described in terms of random access response examples.

In general, the communication protocol stack of the network device and the terminal device includes a packet data mapping protocol (packet data convergence protocol, PDCP) layer, a radio link control protocol (radio link control protocol, RLC) layer, a MAC layer, and a physical layer protocol (physical layer protocol, PHY). Here, the change of contents included in the MAC layer is mainly referred to.

The MAC PDU of the random access response (also referred to as "message 2") includes two parts, a MAC header and a payload. The MAC header is further composed of a plurality of sub-headers, and each sub-header is one byte (8 bits) or a plurality of bytes. Where there may be one or more sub-heads for information and other sub-heads for RAR. The payload contains the specific content of the RAR. The sub-header for the RAR in the MAC header corresponds one-to-one with the RAR in the load. The MAC RAR sub-header consists of three fields, namely an extension field, a type field and a k-bit random access preamble index field and/or a random access resource index field, where k may be equal to 6 or greater than 6. The payload contains at least one of four fields: a 1 bit reserved (R), a corresponding time advance (time advance command), an uplink Grant (UL Grant), a Temporary cell radio network Temporary identity (Temporary cell-radio network Temporary identifier, temporary C-RNTI).

In this embodiment, the MAC PDU includes an index field of a random access preamble and/or a random access resource of more than 6 bits, or an index field of a random access resource of more than 6 bits, for example, the number of bits is 7 to 16. So that the network device can respond to random access preambles transmitted by more terminal devices. The index field of the random access preamble and/or the random access resource may be located in the MAC subheader, or may be located partially in the MAC subheader, or partially in the payload, as will be described in detail later.

In general, one random access preamble may be transmitted on one random access time-frequency resource, or a plurality of random access preambles may be transmitted on one random access time-frequency resource, or a plurality of preambles may be transmitted on a plurality of random access time-frequency resources, where each preamble is located on a different random access time-frequency resource. The configuration of the random access resources includes time, frequency and random access preamble sequence. The plurality of random access resources may be different in time, frequency, or random access preamble sequence, or two or all of them. The random access resource may be understood as a random access opportunity (RACH ocversion/RACH transmission occasion/RACH access unit/RACH channel) of one or more access random access channels (random access channel, RACH). A random access preamble format may be transmitted in a random access opportunity.

The network device detects the received signal, and if a certain random access preamble (the random access preamble may be a preamble sequence) or a partial sequence in the preamble (the random access preamble is a plurality of sequences or a repetition of a sequence) is detected, generates a random access response (also called message 2 (MSG 2)) corresponding to the preamble sequence. The network device associates an independent random access resource and/or random access preamble with each downlink signal, and when the network device receives the random access preamble sent on the random access resource associated with a certain downlink signal k, it sends a random access response by using a transmission beam corresponding to the downlink signal k.

After the terminal device has sent a random access preamble, it needs to wait for receiving a random access response of the network device. Because the preambles detected by the network device in the same random access time-frequency resource position can be responded in the same message 2, one random access time-frequency resource position may correspond to all or part of a preamble sequence, or one random access time-frequency resource position corresponds to a plurality of random access preambles, the terminal device receives random access responses from the network device, and the terminal device acquires random access responses of the terminal device according to the random access preamble index and/or the random access resource index. Specifically, within a time window specified by downlink control information (downlink control information, DCI) of the network device, the terminal device listens to the downlink physical control channel using a corresponding random access-radio network temporary identifier (RA-RNTI). If DCI identified by RA-RNTI is received, the terminal equipment decodes the random access response at the time-frequency position indicated by the physical downlink control channel, namely, receives the random access response.

The following describes in detail how the index field of the random access preamble and/or the index field of the random access resource in the MAC PDU are placed, and the contents of other more fields included in the MAC PDU:

in one implementation, the MAC PDU of the random access response includes a MAC header and a payload, the MAC header including at least one random access response sub-header (RAR sub-header); the random access preamble index field and/or the index field of the random access resource is located in the at least one random access response sub-header. Specifically, in LTE, each MAC subheader is 8 bits. In this implementation, the MAC subheader for RAR is extended, e.g., to n bits, where n is a positive integer greater than 8, e.g., n=9-24. Alternatively, the MAC header may include other information sub-header (e.g., a back-off indication sub-header in LTE) and the RAR sub-header, or the MAC header may include no other information sub-header and only the RAR sub-header. In one implementation, the length of the MAC header is an integer multiple of 8, i.e., if the total number of bits of other information sub-headers and RAR sub-headers in the MAC sub-header is not an integer multiple of 8, the MAC header is padded to an integer multiple of 8.

In another implementation, the MAC PDU of the random access response includes a MAC header and a payload, the MAC header including at least one random access response sub-header; the random access preamble index field and/or the index field of the random access resource comprises a first part and a second part, the first part is located in the at least one random access response sub-header, and the second part is located in the load.

In particular, the first part may be a part of bits from the highest order or lowest order of the random access preamble index field and/or the index field of the random access resource, and the second part may be the remaining bits of the random access preamble index field and/or the index field of the random access resource. In other embodiments, the first portion may be a middle portion of bits of the random access preamble index field and/or the index field of the random access resource, and the second portion may be remaining bits of the random access preamble index field and/or the index field of the random access resource.

Specifically, the second part of bits of the random access preamble index field and/or the index field of the random access resource are located in the payload (i.e. MAC RAR). The second part of the random access preamble index field and/or the index field of the random access resource may be located in a reserved bit position of the MAC RAR or in the UL Grant field, for example, or even a field may be added to the MAC RAR, and the second part of the bits of the random access preamble index field (RAPID) and/or the index field of the random access resource may be specially placed.

Take RAPID as an example. Fig. 6 is a schematic diagram of a MAC PDU format of a random access response according to an embodiment of the present invention. In this structure, the index field of RAPID includes k bits, the first part includes k1 bits, the second part includes k2 bits, and k=k1+k2. Where the RAPID of k1 bits is located in the MAC subheader and the RAPID of k2 bits is located in a reserved location of RAR, for example k1=4 to 14 and k2=1 to 16. In addition, other bits in the MAC subheader are optional, may be reserved bits, may be other indication bits, and may be located after E/T and before RAPID. The other bits in the MAC RAR may be reserved bits, may be reference signal received power (reference signal received power, RSRP), and the relative positions of the various fields may be adjusted arbitrarily. The fields E and T each occupy at least one bit.

In yet another implementation, the random access preamble includes at least one random access preamble sequence, and the random access preamble index field includes an index field of the at least one random access preamble sequence. Specifically, as shown in a schematic diagram of random access resource and random access preamble reception in the multi-beam communication network in fig. 7, one downlink signal is associated with a corresponding random access resource, and a random access preamble or preamble format corresponding to one random access resource may include a plurality of preamble sequences (in the figure, sequence 1 and sequence 2 are illustrated). When the network device receives random access preambles using multiple beams, it is possible that a portion of the preamble sequence of one random access preamble is received in one receive beam (two receive beams, one receive beam receive sequence 1 and the other receive beam receive sequence 2, are illustrated in the figure). At this time, the network device responds to the random access preamble sequence detected in each received beam, and then the index field of the random access preamble sequence and/or the time of the preamble sequence (for example, the preamble includes N preamble sequences, numbered 0,1, N-1 in sequence, this time indicates the number N corresponding to the preamble sequence) need to be included in the MAC PDU, so as to embody the preamble sequence scanned by the network device in more detail. Specifically, the index of a part of the preamble sequence and/or the detection time of the preamble sequence is located in the MAC subheader, and the index of the remaining part of the preamble sequence and/or the detection time of the preamble sequence is located in the RAR. The sequence index located in the MAC RAR may be: in the reserved bit position of the MAC RAR and UL Grant, even a field may be added, and the remaining bits of the random access preamble index field may be specially placed.

In further embodiments, the two sequences represented in fig. 7 are identical preamble sequence symbols, i.e. sequence 2 is a repetition of sequence 1. At this time, the network device responds to the random access preamble sequence detected in each reception beam, and only the index field of the random access preamble sequence needs to be included in the MAC PDU. Specifically, the index of a part of the preamble sequence is located in the MAC subheader, and the index of the remaining part of the preamble sequence is located in the MAC RAR. The sequence index located in the MAC RAR may be: in the reserved bit position of the MAC RAR and UL Grant, even a field may be added, and the remaining bits of the random access preamble index field may be specially placed. In one MAC PDU, there may be a plurality of MAC subheads and MAC RARs corresponding to identical random access preamble sequence index fields.

There may be multiple identical MAC subheads in the MAC PDU generated by the network device side, or multiple MAC subheads and MAC RARs corresponding to identical random access preamble index, preamble sequence index, resource index, and time index. Taking the representation of a time index as an example, for example, the preamble contains N preamble sequences, numbered 0,1, N-1 in sequence, this time index being the number N to which the preamble sequence corresponds.

When the terminal device detects the MAC PDU, if the first MAC sub-header and the corresponding MAC RAR are detected to be the same as the index of the random access preamble and/or the resource already transmitted, the next MAC sub-header and the corresponding MAC RAR need to be continuously detected until the index of the MAC sub-header and the corresponding MAC RAR is different from the index of the random access preamble and/or the resource already transmitted or all the MAC sub-headers and the corresponding MAC RARs are completely detected. If the terminal equipment detects that the indexes corresponding to the plurality of MAC subheads and the MAC RARs are the same as the indexes of the sent random access preamble and/or resource, one MAC RAR can be randomly selected, and a message 3 is sent according to the MAC RAR indication; a plurality of messages 3 may also be sent for the plurality of MAC RARs.

In a further embodiment, the MAC PDU format of the random access response is related to the configuration in the system information. For example, in the system information, if the random access preamble associated with the downlink signal includes a plurality of sequences or a plurality of identical sequences, the format of the present invention is adopted (that is, if the total number of the random access preambles and/or resources associated with the downlink signal is less than 64, the format of LTE may be used); for another example, in the system information, the indication message 3 uses a first waveform (OFDM), and uses a first MAC PDU format, and uses a second waveform (e.g., DFT-s-OFDM), and uses a second MAC PDU format. In practical applications, more MAC PDU formats may be selected according to the system information.

In yet another implementation, the MAC PDU further comprises a time index and/or a frequency index of a random access preamble or a random access preamble sequence detected by the network device, the time index, the frequency index being located in at least one random access response sub-header or payload. Specifically, as shown in fig. 3, each random access resource corresponds to one time-frequency location, and the preamble index or preamble sequence index corresponding to each random access resource may be the same. The network device receives a plurality of random access preambles or preamble sequences sent by a plurality of terminal devices at different time-frequency positions and responds to the plurality of random access preambles or preamble sequences. Since each random access preamble or preamble sequence has the same index, the terminal device may not be able to distinguish whether it is a response to itself by only the preamble index or the preamble sequence index, and therefore the time index and/or the frequency index of the random access preamble or the preamble sequence detected by the network device needs to be included in the MAC PDU. Thus, after receiving the random access response from the network device, the terminal device parses the MAC PDU of the random access response, and obtains the random access response for the terminal device according to the time index and/or the frequency index of the random access preamble or the random access preamble sequence sent by the terminal device.

The time index and/or frequency index of the preamble index or preamble sequence index and the random access preamble or preamble sequence detected by the network device may be varied in the field position of the MAC PDU. One way is to place an index of the preamble or preamble sequence in the MAC subheader, and place a time index and/or frequency index of the detected preamble or preamble sequence in the MAC RAR. Alternatively, a part of the index of the preamble or preamble sequence is placed in the MAC sub-header, and the index bits of the remaining preamble or preamble sequence, and the time index and/or frequency index of the detected preamble sequence are placed in the MAC RAR. The index of the preamble or preamble sequence placed in the MAC RAR and the index of time and frequency may be: put into reserved bit position of MAC RAR, UL Grant, even a field can be added, and index of preamble or preamble sequence, time and frequency index are specially placed. In still another embodiment, the random access preambles in the random access resources are collectively numbered, for example, there are N random access resources, and if there are K random access preambles in each random access resource, the NK random access preambles are numbered from 0 to NK-1 at a time. When NK is greater than 64, a response can be taken with any of the above implementations; when NK is less than or equal to 64, the response may be in a LTE-like manner, i.e. the MAC sub-header contains a random access preamble index.

According to the random access response method provided by the embodiment of the invention, the index field of the random access preamble and/or the index field of the random access resource with more than 6 bits can be included in the MAC PDU, so that more random access preambles or random access resources are supported, and the collision probability can be reduced when a plurality of terminal devices access network devices.

Fig. 8 is an interactive flow chart of another method for random access response according to an embodiment of the present invention, where the method may include the following steps:

s201, the network equipment sends a random access response to the terminal equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an MAC header and a load, the MAC header comprises at least one information sub-header, and the information sub-header comprises at least one field as follows: an indication field, a setting field, where the indication field is used to indicate a type of information included in the setting field, and the setting field includes at least one information;

wherein the at least one information comprises: the channel state information refers to the configuration information of the signal and the parameter information of the subsequent signal, wherein the parameter information of the subsequent signal comprises at least one of the following: frequency location information, subcarrier spacing information, waveform information, frame structure information, and transmission time information.

The terminal device receives a random access response from the network device.

Specifically, another MAC PDU format diagram of random access response provided by the embodiment of the present invention as shown in fig. 9, where in this MAC PDU, the MAC header includes one or more information subheaders (including information subheader 1 to information subheader k are illustrated in the figure) in addition to one or more random access preamble indexes or random access resource index subheaders (including random access preamble index subheader 1 to random access preamble index subheader n are illustrated in the figure).

Wherein each information sub-header may in turn comprise at least one of the following fields: an indication field, a reserved field, and a set field. For example, the length of the indication field and the setting field is not less than 1 bit, the reserved field is optional, and the positions of the three fields can be interchanged arbitrarily. The indication field is used for indicating the type of information included in a setting field of the present information subheader, and the setting field includes at least one type of information. For example, the information subheader is used for back-off indication (backoff indicator, BI), one or more bits in the indication field indicate that the subheader is used for back-off information, and bits in the configuration field are used for indicating configuration of back-off (the back-off indication is used for indicating load of a cell, the more the load is, the larger the back-off value corresponding to the back-off indication is, which is beneficial to reducing collision of random access, and the back-off value is in units of random access resource time period); for another example, the information sub-header is used to indicate configuration information of a channel state information reference signal (CSI-RS), one or more bits in the indication field indicate that the sub-header is used to configure the CSI-RS, and bits in the configuration field are used to indicate configuration of the CSI-RS (for beam management in a random access process, to obtain a beam with a higher gain), which is beneficial to improving efficiency of communication. For another example, the information sub-header is used to indicate parameter information of a subsequent signal, such as frequency location information, subcarrier spacing information, waveform information, frame structure information, transmission time information of the subsequent signal, where time may refer to a subframe, a slot time slot, a mini-slot, an OFDM (orthogonal frequency division multiplexing ) symbol, where the subsequent signal refers to a signal after message 2, such as at least one signal in message 3, message 4, and/or subsequent data communication (in NR, there may be multiple frequencies/subbands, each frequency/subband having a different subcarrier spacing, waveform, frame structure). For example, the subcarrier spacing, the indication field has a plurality of bits to indicate that the sub-header is used for configuring the subcarrier spacing, and the bits in the configuration field are used for indicating the subcarrier spacing; for another example, the information sub-header is used to indicate frame structure information, and a plurality of bits in the indication field indicate that the sub-header is used to configure a frame structure, and bits in the configuration field are used to indicate frame structure configuration; for another example, the information sub-header is used to indicate waveform information, and a plurality of bits in the indication field indicate that the sub-header is used to configure waveforms, and bits in the configuration field are used to indicate that waveforms used for subsequent signal transmission are OFDM or discrete fourier transform spread orthogonal frequency division multiplexing (Discrete Fourier Transform spread OFDM, DFT-s-OFDM); for another example, the information sub-header is used to indicate time information, and a plurality of bits in the indication field indicate that the sub-header is used to configure the transmission time, and bits in the configuration field are used to indicate the transmission time.

In addition, one information sub-header may also indicate the configuration of various information. For example, in the information sub-header E/T/R/BI for indicating backoff, two fields (R) are used for indicating that the fields are for CSI-RS, subcarrier spacing, frame structure information, and the like. For example, the format of a certain information sub-header is E/T/XX, where T is 2-3 bits, to indicate the type of the field, XX indicates specific field content, and the field content may be configuration values of multiple parameters. For example, in a certain information sub-header format is E/T2/XX, where T is one bit, T2 is 0 to 3 bits, T and T2 are used together to indicate the type of the information sub-header, XX indicates specific information sub-header content, and the field content can set configuration values of multiple parameters. Alternatively, the number of bits of T2 is determined according to a set value of T, for example, T2 is 0 bits when T is 1, and T2 is 1 to 3 bits when T is 0. For another example, in the information sub-header E/T/R/BI for indicating backoff, the first R is for indicating that the field is for CSI-RS, subcarrier spacing, frame structure information, etc., and the second R is for indicating the length of the sub-header. That is, the format of a certain information sub-header is E/T/L/XX, wherein T is 2-3 bits, used for indicating the type of the information sub-header; l is at least one bit for indicating the length of the information sub-header; XX indicates specific information sub-header content. In further embodiments, the above examples may be combined.

It should be noted that in all implementations, the information subheader is optional, i.e. there is an information subheader in some MAC PDUs corresponding to the RAR, and there may not be an information subheader in MAC PDUs corresponding to the other RAR.

According to the random access response method provided by the embodiment of the invention, the MAC sub-head can indicate more information.

The foregoing details of the method according to the embodiments of the present invention and the apparatus according to the embodiments of the present invention are provided below.

Fig. 10 is a schematic block diagram of a network device according to an embodiment of the present invention, which can be applied to the communication system shown in fig. 4. The network device 1000 may include: a transmitting unit 11. The transmitting unit 11 is configured to perform transmission of a random access response, for example, perform the above-described portion of S101. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

According to the network equipment provided by the embodiment of the invention, the index field of the random access preamble and/or the index field of the random access resource with more than 6 bits can be included in the MAC PDU, so that more random access preambles or random access resources are supported, and the collision probability can be reduced when a plurality of terminal equipment access the network equipment.

Fig. 11 is a schematic block diagram of a terminal device according to an embodiment of the present invention, which can be applied to the communication system shown in fig. 4. The terminal device 2000 may include: a receiving unit 21. The receiving unit 21 is configured to perform reception of a random access response, for example, to perform the above-described portion of S101. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

According to the terminal equipment provided by the embodiment of the invention, the index field of the random access preamble and/or the index field of the random access resource with more than 6 bits can be included in the MAC PDU, so that more random access preambles or random access resources are supported, and the collision probability can be reduced when a plurality of terminal equipment access network equipment.

Fig. 12 is a schematic block diagram of another network device according to an embodiment of the present invention, which can be applied to the communication system shown in fig. 4. The network device 3000 may include: a transmitting unit 31. The transmitting unit 31 is configured to perform transmission of a random access response, for example, perform the above-described portion of S201. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

According to the network equipment provided by the embodiment of the invention, more information can be indicated in the MAC sub-header.

Fig. 13 is a schematic block diagram of another terminal device according to an embodiment of the present invention, which can be applied to the communication system shown in fig. 4. The terminal apparatus 4000 may include: a receiving unit 41. The receiving unit 41 is configured to perform reception of a random access response, for example, to perform the above-described portion of S401. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

According to the terminal equipment provided by the embodiment of the invention, more information can be indicated in the MAC sub-header.

The embodiment of the invention also provides another network device, which can be the network device in the communication system, and the network device can adopt the hardware architecture shown in fig. 14. The network device may include a receiver, a transmitter, a memory, and a processor, which are interconnected by a bus. The relevant functions implemented by the transmitting unit 11 in fig. 10 may be implemented by a transmitter.

The memory includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (ROM), erasable programmable read-only memory (erasable programmable read only memory, EPROM), or portable read-only memory (compact disc read-only memory, CD-ROM) for associated instructions and data.

The receiver is for receiving data and/or signals and the transmitter is for transmitting data and/or signals. The transmitter and receiver may be separate devices or may be a unitary device, such as a transceiver.

A processor may include one or more processors, including for example one or more central processing units (central processing unit, CPU), which in the case of a CPU may be a single core CPU or a multi-core CPU.

The memory is used to store program codes and data for the network device, and may be a separate device or integrated in the processor.

The various devices described above may be implemented integrated in a chip, for example, in a baseband chip.

Specifically, the processor is configured to control the transmitter to send a random access response to the terminal device, for example, to perform the above-mentioned step S201. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

It will be appreciated that fig. 14 shows only a simplified design of a network device. In practical applications, the network device may also include other necessary elements, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all network devices that may implement the embodiments of the present invention are within the scope of the present invention.

The embodiment of the invention also provides a terminal device, which can be the terminal device in the communication system, and the terminal device can adopt the hardware architecture shown in fig. 14. The terminal device may include a receiver, a transmitter, a memory, and a processor, which are interconnected by a bus. The relevant functions implemented by the receiving unit 21 in fig. 11 may be implemented by a receiver.

Memory, including but not limited to RAM, ROM, EPROM, CD-ROM, is used for related instructions and data.

A processor may include one or more processors, including for example one or more CPUs, which in the case of a processor being a CPU may be a single core CPU or a multi-core CPU.

The memory is used for storing program codes and data of the terminal device, and may be a separate device or integrated in the processor.

Specifically, the processor is configured to control the receiver to receive a random access response from the network device, for example, to perform the step S101 described above. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

It will be appreciated that fig. 14 shows only a simplified design of the terminal device. In practical applications, the terminal device may also include other necessary elements, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all terminal devices that can implement the present invention are within the scope of the present invention.

The embodiment of the invention also provides another network device, which can be the network device in the communication system, and the network device can adopt the hardware architecture shown in fig. 14. The network device may include a receiver, a transmitter, a memory, and a processor, which are interconnected by a bus. The relevant functions implemented by the transmitting unit 31 in fig. 12 may be implemented by a transmitter.

It will be appreciated that fig. 14 shows only a simplified design of a network device. In practical applications, the network devices may also include other necessary elements, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all network devices that can implement the present invention are within the scope of the present invention.

The embodiment of the invention also provides a terminal device, which can be the terminal device in the communication system, and the terminal device can adopt the hardware architecture shown in fig. 14. The terminal device may include a receiver, a transmitter, a memory, and a processor, which are interconnected by a bus. The relevant functions implemented by the receiving unit 41 in fig. 13 may be implemented by a receiver.

Specifically, the processor is configured to control the receiver to receive a random access response from the network device, for example, to perform the above-mentioned step S201. Reference may be made specifically to the description of the method embodiments, and no further description is given here.

According to the terminal equipment provided by the embodiment of the application, more information can be indicated in the MAC sub-header.

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

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

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

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

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

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted across a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital versatile disk (digital versatile disc, 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 implementing all or part of the above-described method embodiments may be accomplished by a computer program to instruct related hardware, the program may be stored in a computer readable storage medium, and the program may include the above-described method embodiments when executed. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic disk or optical disk.

Claims

1. A random access response method, comprising:

the network equipment sends a random access response to the terminal equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6;

the MAC PDU of the random access response comprises a MAC header and a load, wherein the MAC header comprises at least one random access

Entering a response subheader;

the random access preamble index field and/or the index field of the random access resource is/are located in the at least one random access response sub-header; or (b)

The index field of the random access preamble is located in the at least one random access response sub-header and the load; or (b)

The index field of the random access resource is located in the at least one random access response subheader and the load; or (b)

The index field of the random access preamble and the index field of the random access resource are located in the at least one random access response sub-header and the payload.

2. The method of claim 1, wherein a random access preamble comprises at least one random access preamble sequence, the random access preamble index field comprising an index field of the at least one random access preamble sequence.

3. The method according to any of claims 1 to 2, wherein the MAC PDU further comprises a time index and/or a frequency index of a random access preamble or a random access preamble sequence detected by the network device, wherein the time index is located in at least one random access response sub-header and/or load and the frequency index is located in at least one random access response sub-header and/or load.

4. A random access response method, comprising:

the method comprises the steps that terminal equipment receives a random access response from network equipment, wherein a media access control layer protocol data unit (MAC PDU) of the random access response comprises an index field of a k-bit random access preamble and/or an index field of a random access resource, and k is a positive integer greater than 6;

The MAC PDU of the random access response comprises a MAC header and a load, wherein the MAC header comprises at least one random

Accessing a response sub-header;

5. The method of claim 4, wherein the random access preamble comprises at least one random access preamble sequence, the random access preamble index field comprising an index field of the at least one random access preamble sequence.

6. The method according to claim 4 or 5, wherein the MAC PDU further comprises a time index and/or a frequency index of a random access preamble or a random access preamble sequence detected by the network device, wherein the time index is located in at least one random access response sub-header or payload and the frequency index is located in at least one random access response sub-header or payload;

After receiving the random access response from the network device, the terminal device further includes:

and the terminal equipment analyzes the MAC PDU of the random access response, and obtains the random access response aiming at the terminal equipment according to the time index and/or the frequency index of the random access preamble or the random access preamble sequence sent by the terminal equipment.

7. A network device, comprising:

a sending unit, configured to send a random access response to a terminal device, where a medium access control layer protocol data unit MAC PDU of the random access response includes an index field of a k-bit random access preamble and/or an index field of a random access resource, where k is a positive integer greater than 6;

Accessing a response sub-header;

8. The network device of claim 7, wherein the random access preamble comprises at least one random access preamble sequence, the random access preamble index field comprising an index field of the at least one random access preamble sequence.

9. The network device of claim 7 or 8, wherein the MAC PDU further comprises a time index and/or a frequency index of the network device detecting a random access preamble or a random access preamble sequence, wherein the time index is located in at least one random access response sub-header or payload and the frequency index is located in at least one random access response sub-header or payload.

10. A terminal device, comprising:

a receiving unit, configured to receive a random access response from a network device, where a medium access control layer protocol data unit MAC PDU of the random access response includes an index field of a k-bit random access preamble and/or an index field of a random access resource, where k is a positive integer greater than 6;

Accessing a response sub-header;

11. The terminal device of claim 10, wherein the random access preamble comprises at least one random access preamble sequence, and the random access preamble index field comprises an index field of the at least one random access preamble sequence.

12. The terminal device according to claim 10 or 11, wherein the MAC PDU further comprises the network device

Detecting a time index and/or a frequency index of a random access preamble or a random access preamble sequence, wherein the time index is positioned in at least one random access response sub-header or load, and the frequency index is positioned in at least one random access response sub-header or load;

The receiving unit is specifically configured to parse the MAC PDU of the random access response, and obtain the random access response for the terminal device according to the time index and/or the frequency index of the random access preamble or the random access preamble sequence sent by the terminal device.

13. A computer readable storage medium comprising instructions which, when run on a computer, perform the method of any one of claims 1 to 6.

14. A communication chip, comprising: a processor for executing a computer program or instructions in memory to implement the method of any one of claims 1 to 3.

15. A communication chip, comprising: a processor for executing a computer program or instructions in memory to implement the method of any of claims 4 to 6.