CN112997574B - Random access method, terminal equipment and network equipment - Google Patents

Abstract

The embodiment of the application relates to a random access method, terminal equipment and network equipment, wherein the method comprises the following steps: the method comprises the steps that terminal equipment receives a Random Access Response (RAR) sent by network equipment, wherein the RAR comprises a plurality of transmission opportunities for transmitting a message 3 in random access; and the terminal equipment carries out channel sensing on the transmission opportunities after the first transmission opportunity according to the first transmission opportunity in the plurality of transmission opportunities until the channel sensing is successful. The random access method, the terminal device and the network device of the embodiment of the application can reduce the time delay of random access.

Description

Random access method, terminal equipment and network equipment

Technical Field

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

Background

A New Radio (NR) system supports data transmission on an unlicensed spectrum, and when a communication device communicates on the unlicensed spectrum, it needs to use a Listen Before Talk (LBT) principle, that is, before the communication device transmits a signal on a channel of the unlicensed spectrum, it needs to perform channel sensing (or called channel detection) first, and only when a channel sensing result is that the channel is idle, the communication device can transmit the signal; if the communication device performs channel sensing on the unlicensed spectrum, the channel sensing result is that the channel is busy, and signal transmission cannot be performed.

An NR-Based Unlicensed Spectrum Access (NR-U) system has a high requirement on a delay of a random Access when a terminal device performs the random Access. Therefore, how to reduce the delay of the random access is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides a random access method, terminal equipment and network equipment, which can reduce the time delay of random access.

In a first aspect, a method for random access is provided, where the method includes: the method comprises the steps that terminal equipment receives a Random Access Response (RAR) sent by network equipment, wherein the RAR comprises a plurality of transmission opportunities for transmitting a message 3 in random access; and the terminal equipment carries out channel interception on the transmission opportunities after the first transmission opportunity according to the first transmission opportunity in the plurality of transmission opportunities until the channel interception is successful.

In a second aspect, a method for random access is provided, the method including: a network device sends a Random Access Response (RAR) to a terminal device, wherein the RAR comprises a plurality of transmission opportunities for the terminal device to transmit a message 3 in random access; the network device determines a target transmission opportunity for receiving the message 3 according to a first transmission opportunity of the plurality of transmission opportunities.

In a third aspect, a terminal device is provided, configured to perform the method in the first aspect or each implementation manner thereof.

Specifically, the terminal device includes a functional module for executing the method in the first aspect or each implementation manner thereof.

In a fourth aspect, a network device is provided for performing the method of the second aspect or its implementation manners.

In particular, the network device comprises functional modules for performing the methods of the second aspect or its implementations described above.

In a fifth aspect, a terminal device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method in the first aspect or each implementation manner thereof.

In a sixth aspect, a network device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method of the second aspect or each implementation mode thereof.

In a seventh aspect, an apparatus is provided for implementing the method in any one of the first to second aspects or implementations thereof.

Specifically, the apparatus includes: a processor configured to call and run the computer program from the memory, so that the apparatus on which the apparatus is installed performs the method according to any one of the first aspect to the second aspect or the implementation manner thereof.

Optionally, the device is a chip.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, the computer program causing a computer to perform the method of any one of the first to second aspects or implementations thereof.

In a ninth aspect, there is provided a computer program product comprising computer program instructions to cause a computer to perform the method of any one of the first to second aspects or implementations thereof.

A tenth aspect provides a computer program which, when run on a computer, causes the computer to perform the method of any one of the first to second aspects or implementations thereof.

According to the technical scheme, the RAR sent by the network equipment to the terminal equipment comprises a plurality of transmission opportunities for transmitting the message 3, so that the problem that the terminal equipment does not have available transmission opportunities and needs to return to the message 1 to retry random access due to failure of channel sensing when only one transmission opportunity exists is solved. Further, the terminal device may perform channel sensing for a plurality of transmission opportunities subsequent to the first transmission opportunity according to the first transmission opportunity of the plurality of transmission opportunities, so as to increase the probability of successful channel sensing, thereby reducing the time delay of random access.

Drawings

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

Fig. 2 is a schematic flow chart of a four-step random access method according to an embodiment of the present application.

Figure 3 is a schematic diagram of a MAC PDU including a RAR according to an embodiment of the application.

FIG. 4 is a schematic block diagram of a BI prefix in accordance with embodiments of the present application.

Fig. 5 is a schematic block diagram of a RAPID header according to an embodiment of the present application.

Fig. 6 is a schematic block diagram of a MAC RAR according to an embodiment of the present application.

Fig. 7 is a schematic flow chart of a method of random access according to an embodiment of the application.

Fig. 8-10 are schematic diagrams of a portion of a transmission opportunity according to an embodiment of the present application.

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

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

Fig. 13 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of an apparatus according to an embodiment of the present application.

Fig. 15 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The embodiments of the present application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an Advanced Long Term Evolution (LTE-a) System, a New Radio (NR) System, an Evolution System of an NR System, an LTE (LTE-based Access to unlicensed spectrum, LTE-U) System on unlicensed spectrum, an NR (NR-based Access to unlicensed spectrum, UMTS (Universal Mobile telecommunications System), a Wireless Local Area Network (WLAN) System, a Wireless Local Area network (WiFi) System, or other Wireless Local Area communication systems.

Generally, the conventional Communication system supports a limited number of connections and is easy to implement, however, with the development of Communication technology, the mobile Communication system will support not only conventional Communication but also, for example, device-to-Device (D2D) Communication, machine-to-Machine (M2M) Communication, machine Type Communication (MTC), and Vehicle-to-Vehicle (V2V) Communication, and the embodiments of the present application can also be applied to these Communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a Carrier Aggregation (CA) scenario, may also be applied to a Dual Connectivity (DC) scenario, and may also be applied to an independent (SA) networking scenario.

For example, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Alternatively, the Network device 110 may be a Base Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a Mobile switching center, a relay, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), digital Subscriber Line (DSL), digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., for a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal Equipment may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

The network device 110 may provide a service for a cell, and the terminal device 120 communicates with the network device 110 through a transmission resource (for example, a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device 110 (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a Small cell (Small cell), where the Small cell may include, for example, a Metro cell (Metro cell), a Micro cell (Micro cell), a Pico cell (Pico cell), a Femto cell (Femto cell), and the like, and the Small cells have characteristics of Small coverage and low transmission power, and are suitable for providing a high-rate data transmission service.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

After the cell search procedure, the terminal device has acquired downlink synchronization with the cell, and thus the terminal device can receive downlink data. However, the terminal device can perform uplink transmission only if it acquires uplink synchronization with the cell. The terminal device may establish a connection with the cell through a Random Access Procedure (Random Access Procedure) and acquire uplink synchronization. The random access procedure may be typically triggered by the following events:

(1) Initial Access (Initial Access).

The terminal device may enter an RRC CONNECTED state (RRC _ CONNECTED) from a Radio Resource Control (RRC) IDLE state (RRC _ IDLE state).

(2) RRC Connection reestablishment procedure (RRC Connection Re-establishment procedure).

(3) Handover (Handover).

At this time, the terminal device is in a connected state, and needs to establish uplink synchronization with the new cell.

(4) In the RRC CONNECTED state, when downlink data or uplink data arrives, the uplink is in an "out-of-sync" state (DL or UL data arrival RRC _ CONNECTED while UL synchronization status is a "non-synchronized").

(5) In the RRC CONNECTED state, when Uplink data arrives, there is no available Physical Uplink Control Channel (PUCCH) resource for Scheduling Request (SR) transmission (UL data associated with RRC _ CONNECTED while other areas are not used for PUCCH resources for SR available).

(6) SR failure (SR failure).

(7) Request by RRC at the time of synchronous configuration (Request by RRC uplink synchronization configuration).

(8) The terminal device transitions from the RRC INACTIVE state (Transition from RRC _ INACTIVE).

(9) Time alignment is established at SCell addition (To estimation time alignment at SCell addition).

(10) The terminal device requests Other System Information (OSI).

(11) The terminal device needs to perform Beam (Beam) failure recovery (Beam failure recovery).

In the NR system, two random access schemes can be supported: such as the contention-based random access scheme and the non-contention-based random access scheme shown in fig. 2. The contention-based four-step random access procedure will be briefly described below with reference to fig. 2:

step 1, the terminal device sends a random access Preamble (Msgl) to the network device.

The random access preamble may also be referred to as a preamble, a random access preamble sequence, a preamble sequence, or the like.

Specifically, the terminal device may select a Physical Random Access Channel (PRACH) resource, where the PRACH resource may include a time domain resource, a frequency domain resource, and a code domain resource. Next, the terminal device may send the selected Preamble on the selected PRACH resource. The network device can estimate the transmission delay between the network device and the terminal device according to the Preamble and calibrate the uplink timing (timing) according to the estimation delay, and can generally determine the resource size required by the terminal device to transmit the message 3 (Msg 3).

Step 2, the network device sends a Random Access Response (RAR, i.e. message2, msg 2) to the terminal device

After the terminal device sends the Preamble to the Network device, an RAR window may be opened, and a corresponding Physical Downlink Control Channel (PDCCH) is detected in the RAR window according to a Random Access Radio Network Temporary Identifier (RA-RNTI). If the terminal device detects the PDCCH scrambled by the RA-RNTI, a Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH can be obtained. Wherein, the PDSCH includes a RAR corresponding to the Preamble.

If the RAR replied by the network device is not received within the RAR window, the terminal device may consider that the random access procedure fails. It will be appreciated that both the terminal device and the network device need to uniquely determine the value of the RA-RNTI, otherwise the terminal device is unable to decode the RAR.

Optionally, in this embodiment of the present application, the RA-RNTI may calculate a value of the RA-RNTI through a time-frequency position of the Preamble that is clear for both the transmitter and the receiver. For example, the RA-RNTI associated with the Preamble can be calculated by equation (1):

RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id (1)

wherein, s _ id is an index (s _ id is greater than or equal to 0 and less than 14) of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the PRACH resource, t _ id is an index (t _ id is greater than or equal to 0 and less than 80) of a first slot of the PRACH resource in a system frame, f _ id is an index (f _ id is greater than or equal to 0 and less than 8) of the PRACH resource in a Frequency domain, ul _ carrier _ id is an uplink carrier (0 represents a NUL carrier, and 1 represents a SUL carrier) for transmitting a Preamble. For FDD, there is only one PRACH resource per subframe, so f _ id is fixed to 0.

In other words, since the time-frequency position of the Preamble sent by the terminal device is determined, the network device also obtains the time-frequency position of the Preamble when decoding the Preamble, and further knows the RA-RNTI needed to be used in the RAR. When the terminal device successfully receives an RAR (decoding using the determined RA-RNTI), and a Random Access Preamble Identifier (RAPID) in the RAR is the same as the Preamble index sent by the terminal device, it may be considered that the RAR is successfully received, and at this time, the terminal device may stop detecting the PDCCH scrambled by the RA-RNTI.

The RAR may be carried in a Media Access Control (MAC) Protocol Data Unit (PDU), and information carried by the RAR is described below with reference to fig. 4 from the perspective of a MAC PDU including the RAR.

As can be seen from fig. 3, one MAC PDU may include one or more MAC sub-PDUs (sub-PDUs) and possibly padding bits, and one MAC sub-PDU may have only a Backoff Indicator (BI), or only a Random Access Preamble Identifier (RAPID), or both a RAPID and a MAC RAR.

As can be seen from the structure of the MAC PDU, if the network device detects random access requests from multiple terminal devices on the same PRACH resource, one MAC PDU may be used to respond to the access requests, and the response of each random access request (corresponding to one Preamble index) corresponds to one RAR. In other words, if multiple terminal devices transmit preambles on the same PRACH resource (same time-frequency position, using the same RA-RNTI), the corresponding RARs are multiplexed in the same MAC PDU.

That is, all terminal devices that transmit preambles using the same PRACH resource (the preambles are not necessarily the same) detect the PDCCH scrambled by the same RA-RNTI and receive the same MAC PDU, but different pids correspond to different RARs.

Since the MAC PDU can only be scrambled by using one RA-RNTI, this also means that RARs corresponding to preambles transmitted using different PRACH resources (different time and frequency locations) cannot be multiplexed into the same MAC PDU.

FIG. 4 is a schematic block diagram of a BI subheader of an embodiment of the present application. As shown in fig. 4, the BI subheader may include one extension field (E), one type field (T), two reserved fields (R), and a BI value.

For a BI subheader, the BI subheader appears only once and is located at the first header of a MAC header (header). If the terminal equipment receives a BI subheader, a backspacing value is stored, and the backspacing value is equal to a value corresponding to the BI in the header; otherwise the terminal device may set the Backoff value to 0. The value corresponding to the BI specifies the time range that the terminal equipment needs to wait before retransmitting the Preamble. If the terminal device does not receive the RAR within the RAR window, or none of the received RARs has a RAPID matching with the preamble index selected by itself, it may be considered that the RAR reception fails. At this time, the terminal device needs to wait for a period of time and then starts random access. The waiting time may be any random value within a waiting time interval specified by the values corresponding to 0 to BI.

Fig. 5 is a schematic block diagram of a RAPID subheader of an embodiment of the present application.

As shown in fig. 5, the RAPID subheader may include one E, one T, and RAPID values. Wherein RAPID is Preamble index received by the network device in response. If the terminal device finds that the value is the same as the index used when the terminal device sends the Preamble, the terminal device can consider that the corresponding RAR is successfully received.

Fig. 6 is a schematic block diagram of a MAC RAR of an embodiment of the application. As shown in fig. 6, the MAC RAR may include: reserved bits R (e.g., 1 bit), a Time Alignment Command (TAC), an uplink grant (UL grant), and a Temporary Cell Radio Network Temporary Identifier (TC-RNTI).

The TAC may be used to specify a time adjustment amount required for uplink synchronization of the terminal device, and may occupy 12 bits. The UL grant may be used for scheduling the uplink resource indication of Msg3. The TC-RNTI can be used for scrambling PDCCH (initial access) of the Msg4.

And 3, the terminal equipment sends the Msg3.

After receiving the RAR message, the terminal device determines whether the RAR is an RAR message belonging to the terminal device, for example, the terminal device may perform a check by using a preamble index, and after determining that the RAR message belongs to the terminal device, may generate Msg3 on an RRC layer, and send Msg3 to the network device, where identification information of the terminal device needs to be carried.

The Msg3 is mainly used for notifying the network device of a trigger event of the random access. The Msg3 sent by the terminal device in step 3 may include different content for different random access triggering events.

For example, for the initial access scenario, msg3 may include an RRC connection Request message (RRC Setup Request) generated by the RRC layer. In addition, msg3 may also carry, for example, a Serving-temporal Mobile Subscriber Identity (S-TMSI) or a random number of the terminal device.

For another example, for the RRC connection reestablishment scenario, msg3 may include an RRC connection reestablishment Request message (RRC Request) generated by the RRC layer. In addition, the Msg3 may also carry a Cell Radio Network Temporary Identifier (C-RNTI), for example.

For another example, for a Handover scenario, msg3 may include an RRC Handover Confirm message (RRC Handover Confirm) generated by the RRC layer, which carries the C-RNTI of the terminal device. In addition, the Msg3 may also carry information such as a Buffer Status Report (BSR). For other triggering events such as the arrival of uplink/downlink data, the Msg3 can at least include the C-RNTI of the terminal device.

Step 4, the network device sends a conflict resolution message (Msg 4) to the terminal device.

The Msg4 may include a contention resolution message and an uplink transmission resource allocated to the terminal device. After receiving the Msg4 sent by the network device, the terminal device may detect whether the Msg4 includes part of the Msg3 sent by the terminal device. If yes, it indicates that the random access process of the terminal device is successful, otherwise, it is determined that the random access process is failed, and the terminal device needs to initiate the random access process from step 1 again.

Since the terminal device in step 3 can carry its unique identifier in Msg3, the network device will carry the unique identifier of the terminal device in Msg4 in the contention resolution mechanism to designate the terminal device that wins the contention.

In an NR-Based Unlicensed Spectrum Access (NR-Based Access to Unlicensed Spectrum, NR-U) system, a terminal device performs channel sensing before each uplink transmission to sense whether a channel is idle, and the terminal device may perform data transmission only after the channel sensing is successful. When the terminal device performs random access, if the RAR sent by the network device to the terminal device includes a UL grant (i.e., a transmission opportunity of Msg 3), in this way, when the terminal device performs channel sensing for the transmission opportunity of Msg3, if the channel sensing fails, the terminal device may fall back to Msgl to perform random access again, which may increase the delay of random access.

In view of this, the embodiments of the present application provide a random access method, which can reduce a time delay of a terminal device for performing random access.

In order to enhance the understanding of the embodiments of the present application, a brief description of unlicensed spectrum is provided below.

Unlicensed spectrum is a spectrum that is divided by countries and regions and available for radio device communications, and may be considered a shared spectrum, i.e., a spectrum that may be used by communication devices in different communication systems as long as the regulatory requirements set by the country or region on the spectrum are met, and no proprietary spectrum license may be applied to the government. In order to enable each communication system using the unlicensed spectrum for wireless communication to coexist friendly on the spectrum, an LBT-based principle is required, that is, before a communication device performs signal transmission on a channel of the unlicensed spectrum, it needs to perform channel sensing (or called channel detection) first, and only when a channel sensing result is that the channel is idle, the communication device can perform signal transmission; if the communication device performs channel sensing on the unlicensed spectrum, the channel sensing result is that the channel is busy, and signal transmission cannot be performed. In order to ensure fairness, in one transmission, the duration of signal transmission by the communication device using the unlicensed spectrum Channel may not exceed a Maximum Channel Occupancy Time (MCOT).

Fig. 7 is a schematic flow chart diagram of a method 300 of random access according to an embodiment of the present application. The method described in fig. 7 may be performed by a terminal device, such as terminal device 120 shown in fig. 1, and a network device, such as network device 110 shown in fig. 1. As shown in fig. 7, the method 300 may include at least some of the following.

It should be noted that the technical solution of the method 300 may be applied to a four-step random access process, and may also be applied to a two-step random access process, for example, a scenario in which the four-step random access is backed to the two-step random access process.

In 310, the network device sends a RAR to the terminal device, where the RAR includes multiple transmission opportunities for transmitting a message 3 in random access.

In the embodiment of the present application, the transmission opportunity for transmitting the message 3 may also be referred to as a UL grant or other names, which is not specifically limited in the embodiment of the present application.

In 320, the terminal device receives the RAR sent by the network device.

In 330, the terminal device performs channel sensing for a transmission opportunity after the first transmission opportunity according to the first transmission opportunity in the plurality of transmission opportunities until the channel sensing is successful.

It should be noted that the above-mentioned references to the transmission opportunity after the first transmission opportunity may include the first transmission opportunity. In addition, the transmission opportunity after the first transmission opportunity may refer to a transmission opportunity after the first transmission opportunity in the time domain, and may also refer to a transmission opportunity after the first transmission opportunity designated by the network device.

In 340, the network device determines a target transmission opportunity for receiving message 3 from a first transmission opportunity of the plurality of transmission opportunities.

And the terminal equipment sends Preamble to the network equipment after the uplink channel is successfully monitored, and opens a RAR window to monitor the Msg2. After the network device sends Msg2 to the terminal device and the terminal device receives Msg2 in the RAR window, if the RAPID of the terminal device is indicated in Msg2 and multiple transmission opportunities for transmitting the message 3 in the random access are indicated, the terminal device may select a first transmission opportunity among the multiple transmission opportunities.

In one implementation, the terminal device may determine an s-th transmission opportunity of the multiple transmission opportunities as a first transmission opportunity, where s is a positive integer. For example, s =1, i.e. the terminal device may determine the first transmission opportunity of the plurality of transmission opportunities as the first transmission opportunity.

Alternatively, s may be protocol specific or network device configured.

In this implementation, if multiple terminal devices send the same Preamble on the same Random Access opportunity (RO), the multiple terminal devices may perform Channel sensing before the first transmission opportunity simultaneously after receiving the Msg2. If the multiple terminal devices are located at similar positions and channel sensing is successful, the multiple terminal devices may select the same (for example, the first channel sensing is successful) transmission opportunity to transmit their Msg3, so that contention conflict of the Msg3 may occur, thereby reducing the probability that the network device correctly decodes the Msg3.

In another implementation, the terminal device may randomly select the first transmission opportunity among the plurality of transmission opportunities.

According to the technical scheme, the terminal equipment randomly selects the first transmission opportunity from the multiple transmission opportunities, so that the first transmission opportunities possibly selected by different terminal equipment are different, the probability that the multiple terminal equipment simultaneously select the same Msg3 resource after receiving the same Msg2 can be reduced, and the competition collision probability of the Msg3 can be further reduced.

The following describes an implementation of the random selection of the first transmission opportunity by the terminal device.

Embodiment 1, the terminal device may randomly select the first transmission opportunity among the plurality of transmission opportunities.

Embodiment 2, the terminal device may randomly select the first transmission opportunity among a part of the plurality of transmission opportunities (referred to as a third transmission opportunity for convenience of description).

At this time, the method 300 may further include: the terminal device determines a third transmission opportunity of the plurality of transmission opportunities.

Among the plurality of transmission opportunities, the third transmission opportunity may be continuous or discontinuous in the time domain. For example, msg2 includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2.. The transmission opportunity 10, wherein transmission opportunity 1 is the earliest in the time domain and transmission opportunity 10 is the latest in the time domain, and the third transmission opportunity may be transmission opportunity 1 and transmission opportunity 2.. The transmission opportunity 5, or the third transmission opportunity may be transmission opportunity 2, transmission opportunity 4, transmission opportunity 5, and transmission opportunity 7.

In the embodiment of the present application, the terminal device may determine the third transmission opportunity in various ways. Exemplarily, in mode 1, the terminal device may randomly select the third transmission opportunity among the plurality of transmission opportunities.

In mode 2, the terminal device may determine the third transmission opportunity according to the priority of the random access event. The priority of triggering the random access event may also be referred to as a random access priority.

Alternatively, among the random access priorities, random access triggered by the initial access and RRC connection re-establishment procedure may have a higher priority, and random access triggered based on beam failure recovery or SR may have a lower priority.

Or alternatively, among the random access priorities, the random access triggered by the initial access and the RRC connection re-establishment procedure may have a lower priority, and the random access triggered based on the recovery of the beam failure or the SR may have a higher priority.

Optionally, the first starting point may be earlier in the time domain than the second starting point if the first priority is higher than the second priority, where the first starting point is a starting point of a third transmission opportunity determined by the terminal device according to the first priority, and the second starting point is a starting point of a third transmission opportunity determined by the terminal device according to the second priority.

For example, if the first terminal device and the second terminal device send the same Preamble on the same RO, msg2 received by the first terminal device and the second terminal device includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2. If the event triggering the first terminal device to perform random access is initial access and the event triggering the second terminal device to perform random access is recovery of beam failure, the starting point of the third transmission opportunity determined by the first terminal device may be transmission opportunity 1, and the starting point of the third transmission opportunity determined by the second terminal device may be transmission opportunity 6.

It will be appreciated that the early start of the third transmission opportunity means that the probability of the terminal device selecting to the earlier first transmission opportunity is greater. For a terminal device with high priority of random access, an earlier transmission opportunity may be selected, so that once the channel sensing is successful, the delay of random access may be reduced, and selecting an earlier transmission opportunity also means that the terminal device may have more transmission opportunities to attempt channel sensing, thereby increasing the probability of random access. Conversely, for a terminal device with a low random access priority, selection of a later transmission opportunity by the terminal device will result in a correspondingly longer transmission opportunity delay and fewer transmission opportunities.

Optionally, the random access priority may be protocol specification, preset on the terminal device, or may also be configured by the network device.

If the random access priority is configured by the network device, the method 300 may further include: the network device determines the random access priority, and then the network device may send third indication information to the terminal device, where the third indication information is used to indicate the random access priority. Optionally, the third indication information may be carried in Radio Resource Control (RRC) signaling, or the Msg2 may include the third indication information, or the third indication information may be carried in a broadcast message, that is, the network device broadcasts priorities corresponding to various random access procedures.

As an example, in the process of determining the third transmission opportunity according to the random access priority, if the random access priority is greater than or equal to the preset priority, that is, the random access priority is higher, for example, if the current random access process is triggered by the initial access, the third transmission opportunity may be the first N transmission opportunities in the multiple transmission opportunities. That is, the terminal device may select the first transmission opportunity among the first N transmission opportunities. N is a positive integer.

Wherein, N may be preset on the terminal device through a protocol, or N may be configured by the network device. If N is configured by the network device, the method 300 may further include: the network device determines N, and then sends first indication information to the terminal device, wherein the first indication information is used for indicating N.

Or, let the number of the multiple transmission opportunities be L, N/L may be that the protocol is preset on the terminal device, or N/L may be configured by the network device.

For example, if N/L is 0.4, when there are 10 transmission opportunities, the terminal device may select the first transmission opportunity from the first 4 transmission opportunities of the 10 transmission opportunities. When there are 5 transmission opportunities, the terminal device may select the first transmission opportunity among the first 2 transmission opportunities of the 5 transmission opportunities.

As another example, if the random access priority is less than the preset priority, i.e. the random access priority is lower, e.g. the current random access procedure is triggered by the SR, the third transmission opportunity may be the last M transmission opportunities of the multiple transmission opportunities. That is, the terminal device may select the first transmission opportunity among the last M transmission opportunities. Wherein M is a positive integer.

Alternatively, M may be preset on the terminal device by a protocol, or M may be configured by the network device. If M is configured by a network device, the method 300 may further include: the network device determines M, and then sends second indication information to the terminal device, wherein the second indication information is used for indicating M.

Or, let the number of the multiple transmission opportunities be L, M/L may be protocol preset on the terminal device, or M/L may be network device configured. If the M/L is network device configured, the method 300 may further include: the network equipment determines the M/L, and then sends first indication information to the terminal equipment, wherein the first indication information is used for indicating the M/L.

For example, if M/L is 0.4, when there are 10 transmission opportunities, the terminal device may select the first transmission opportunity from the last 4 transmission opportunities of the 10 transmission opportunities. When there are 5 transmission opportunities, the terminal device may select the first transmission opportunity among the last 2 transmission opportunities of the 5 transmission opportunities.

It should be understood that, in the embodiments of the present application, the terms "first", "second" and "third" are merely used to distinguish different objects, and do not limit the scope of the embodiments of the present application.

Optionally, all of the first N transmission opportunities may be earlier in the time domain than all of the last M transmission opportunities.

At this time, the last transmission opportunity of the first N transmission opportunities may be adjacent in time domain to the first transmission opportunity of the last M transmission opportunities. For example, as shown in fig. 8, the Msg2 includes 10 transmission opportunities, which are, in sequence, transmission opportunity 1 and transmission opportunity 2.. Linear transmission opportunity 10 in the time domain, the first N transmission opportunities are transmission opportunity 1.. Linear transmission opportunity 5, and the last M transmission opportunities are transmission opportunity 6.. Linear transmission opportunity 10.

Alternatively, the last of the first N transmission opportunities may not be temporally adjacent to the first of the last M transmission opportunities. For example, as shown in fig. 9, msg2 includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2.. Once.transmission opportunity 10 in time domain, the first N transmission opportunities are transmission opportunity 1.. Once.transmission opportunity 4, and the last M transmission opportunities are transmission opportunity 7.. Once.transmission opportunity 10. At this time, transmission opportunity 5 and transmission opportunity 6 are not selected as the first transmission opportunity.

Optionally, the partial transmission opportunities in the first N transmission opportunities may be the same as the partial transmission opportunities in the last M transmission opportunities.

For example, as shown in fig. 10, msg2 includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2.. Once.transmission opportunity 10 in time domain, the first N transmission opportunities are transmission opportunity 1.. Once.transmission opportunity 5, and the last M transmission opportunities are transmission opportunity 4.. Once.transmission opportunity 10. It can be seen that transmission opportunity 4 and transmission opportunity 5 belong to both the first N transmission opportunities and the last M transmission opportunities.

Alternatively, N and M may be the same or different, and this is not particularly limited in this application.

In mode 3, the terminal device may select the third transmission opportunity according to the service carried.

As an example, the terminal device may select the third transmission opportunity according to a service type of the bearer.

Optionally, the service carried by the terminal device may include, but is not limited to: ultra Reliable Low Latency Communication (URLLC) service, enhanced Mobile Broadband (eMBB) service, industrial internet of things service, vertical industry service, voice over Long-Term Evolution (VoLTE) service, car networking service, and the like.

Exemplarily, the multiple transmission opportunities included in Msg2 may be divided into multiple parts, the traffic carried by the terminal device is different, and the third transmission opportunity may belong to a different part. For example, msg2 includes 10 transmission opportunities, which are, in time domain, transmission opportunity 1 and transmission opportunity 2. If the service carried by the terminal device is a URLLC service, the third transmission opportunity may be the first part of the 10 transmission opportunities, i.e., transmission opportunity 1.... Transmission opportunity 3; if the service carried by the terminal device is an eMBB service, the third transmission opportunity may be a second part of the 10 transmission opportunities, that is, transmission opportunity 4.

As another example, the terminal device may select the third transmission opportunity based on the number of services carried.

Optionally, if the number of services carried by the terminal device is greater than or equal to the threshold, the terminal device may select a third transmission opportunity from the first N transmission opportunities in the multiple transmission opportunities.

Optionally, if the number of services carried by the terminal device is smaller than the threshold, the terminal device may select a third transmission opportunity from the last M transmission opportunities in the multiple transmission opportunities.

Mode 4, the third transmission opportunity may be fixed as the first h transmission opportunities or the last h transmission opportunities of the plurality of transmission opportunities.

In the method 4, the random access priority or the service carried by the terminal device is not differentiated, and the third transmission opportunity may be fixed to the first h transmission opportunities or the last h transmission opportunities of the multiple transmission opportunities, or the middle h transmission opportunities.

After the terminal device determines the third transmission opportunity, the first transmission opportunity may be randomly selected from the third transmission opportunities.

According to the technical scheme, the terminal equipment selects the first transmission opportunity from the plurality of transmission opportunities, so that the number of the transmission opportunities selected by the terminal equipment is large, and the probability of the message 3 competition conflict can be further reduced.

After the terminal device selects the first transmission opportunity, the terminal device may perform channel sensing on the transmission opportunity after the first transmission opportunity according to the first transmission opportunity.

Alternatively, the terminal device may perform channel sensing for a transmission opportunity subsequent to the first transmission opportunity, starting from the first transmission opportunity.

In the process that the terminal device performs channel sensing for transmission opportunities subsequent to the first transmission opportunity, starting from the first transmission opportunity, in a possible embodiment, the terminal device may perform channel sensing for transmission opportunities subsequent to the first transmission opportunity in sequence, starting from the first transmission opportunity.

Specifically, the terminal device may perform channel sensing for the first transmission opportunity, and if the channel sensing is successful, the terminal device sends Msg3 to the network device by using the first transmission opportunity. At this time, the first transmission opportunity is the target transmission opportunity. If the channel interception fails, the terminal device performs channel interception for a first transmission opportunity behind the first transmission opportunity, and if the interception succeeds, the terminal device may determine a first transmission opportunity behind the first transmission opportunity as a target transmission opportunity; if the channel sensing fails, the terminal device may perform channel sensing for a second transmission opportunity after the first transmission opportunity, and so on until the channel sensing is successful.

For example, msg2 received by the terminal device includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2 in sequence in a time domain. If the channel sensing fails, the terminal device performs channel sensing for the transmission opportunity 5, and if the channel sensing succeeds, the terminal device may send Msg3 to the network device by using the transmission opportunity 5. If the channel sensing fails, the terminal device continues to perform channel sensing for the transmission opportunity 6.

In another possible embodiment, the terminal device may randomly perform channel sensing for a transmission opportunity after the first transmission opportunity, starting from the first transmission opportunity.

As an example, the terminal device may randomly channel sense for the first transmission opportunity and all transmission opportunities following the first transmission opportunity.

As another example, the terminal device may use the first transmission opportunity as a starting point, and after failing to perform channel sensing for a fixed proportion of transmission opportunities after the first transmission opportunity in sequence, may randomly select a transmission opportunity from the transmission opportunities remaining after the first transmission opportunity for channel sensing.

For example, msg2 includes 10 transmission opportunities, which are transmission opportunity 1 and transmission opportunity 2 in sequence in the time domain, transmission opportunity 10, where the first transmission opportunity is transmission opportunity 5, the ratio of channel sensing performed on the transmission opportunities in sequence is 0.5, the number of transmission opportunities that the terminal device can perform channel sensing is 6 (transmission opportunity 5, transmission opportunity 6.. Once. Transmission opportunity 10), and then the terminal device may perform channel sensing on transmission opportunity 5, transmission opportunity 6, and transmission opportunity 7 in sequence, and if channel sensing fails, the terminal device may randomly select a transmission opportunity from the remaining 3 transmission opportunities to perform channel sensing until channel sensing succeeds.

Optionally, in this embodiment of the present application, after the terminal device determines the target transmission opportunity, the terminal device may send the message 3 to the network device by using the target transmission opportunity. Accordingly, the network device may receive the message 3 sent by the terminal device.

Optionally, in this embodiment of the present application, if the result of channel sensing performed by the terminal device on the transmission opportunity after the first transmission opportunity is failure according to the first transmission opportunity, the random access is failed this time, and the terminal device may perform the next random access attempt, that is, send the Preamble to the network device again.

In the embodiment of the application, the RAR sent by the network device to the terminal device includes multiple transmission opportunities for transmitting the message 3, so that the problem that the terminal device does not have an available transmission opportunity and needs to fall back to the message 1 to retry random access due to failure of channel sensing when only one transmission opportunity exists is avoided. Further, the terminal device may perform channel sensing for a plurality of transmission opportunities subsequent to the first transmission opportunity according to the first transmission opportunity of the plurality of transmission opportunities, so as to increase the probability of successful channel sensing, thereby reducing the time delay of random access.

The preferred embodiments of the present application have been described in detail with reference to the accompanying drawings, however, the present application is not limited to the details of the above embodiments, and various simple modifications may be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications all belong to the protection scope of the present application.

For example, the various features described in the foregoing detailed description may be combined in any suitable manner without contradiction, and various combinations that may be possible are not described in this application in order to avoid unnecessary repetition.

For example, various embodiments of the present application may be arbitrarily combined with each other, and the same should be considered as the disclosure of the present application as long as the concept of the present application is not violated.

It should be understood that, in the various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Having described the communication method according to the embodiment of the present application in detail above, a communication apparatus according to an embodiment of the present application will be described below with reference to fig. 11 to 13, and the technical features described in the method embodiment are applicable to the following apparatus embodiments.

Fig. 11 shows a schematic block diagram of a terminal device 400 of an embodiment of the present application. As shown in fig. 11, the terminal apparatus 400 includes:

a communication unit 410, configured to receive a random access response RAR sent by a network device, where the RAR includes multiple transmission opportunities for transmitting a message 3 in random access.

A processing unit 420, configured to perform channel sensing on a transmission opportunity after a first transmission opportunity in the plurality of transmission opportunities until the channel sensing is successful.

Optionally, in this embodiment of the present application, the processing unit 420 is further configured to: selecting the first transmission opportunity from the plurality of transmission opportunities.

Optionally, in this embodiment of the present application, the processing unit 420 is specifically configured to: the terminal device randomly selects the first transmission opportunity from the plurality of transmission opportunities.

Optionally, in this embodiment of the present application, the processing unit 420 is specifically configured to: randomly selecting the first transmission opportunity from a portion of the plurality of transmission opportunities.

Optionally, in this embodiment of the present application, the processing unit 420 is further configured to: determining the partial transmission opportunity according to a priority of triggering a random access event.

Optionally, in this embodiment of the present application, if a first priority is higher than a second priority, the first starting point is earlier in the time domain than a second starting point, where the first starting point is the starting point of the partial transmission opportunity determined by the processing unit 420 according to the first priority, and the second starting point is the starting point of the partial transmission opportunity determined by the processing unit 420 according to the second priority.

Optionally, in this embodiment of the application, if the priority of the event triggering the terminal device 400 to perform random access is greater than or equal to a preset priority, the part of the transmission opportunities is the first N transmission opportunities in the multiple transmission opportunities.

Optionally, in this embodiment of the present application, N is preset on the terminal device 400 through a protocol, or N is configured by the network device.

Optionally, in this embodiment of the present application, if the priority of the event triggering the terminal device 400 to perform random access is smaller than a preset priority, the part of the transmission opportunities is the last M transmission opportunities in the multiple transmission opportunities.

Optionally, in this embodiment of the present application, the M is preset on the terminal device 400 through a protocol, or the N is configured by the network device.

Optionally, in this embodiment of the present application, the priority of the triggering random access event is specified by a protocol, or the priority of the triggering random access event is configured by the network device.

Optionally, in this embodiment of the application, the processing unit 420 is specifically configured to: and taking the first transmission opportunity as a starting point, and sequentially carrying out channel sensing on the transmission opportunities after the first transmission opportunity.

Optionally, in this embodiment of the present application, the communication unit 410 is further configured to: and sending the message 3 to the network equipment by using a target transmission opportunity, wherein the target transmission opportunity is a transmission opportunity corresponding to a channel which is successfully intercepted by the terminal equipment.

It should be understood that the terminal device 400 may correspond to the terminal device in the method 300, and corresponding operations of the terminal device in the method 300 may be implemented, which are not described herein again for brevity.

Fig. 12 shows a schematic block diagram of a network device 500 of an embodiment of the application. As shown in fig. 12, the network device 500 includes:

a communication unit 510, configured to send a random access response RAR to a terminal device, where the RAR includes multiple transmission opportunities for the terminal device to transmit a message 3 in random access.

A processing unit 520, configured to determine a target transmission opportunity for receiving the message 3 according to a first transmission opportunity of the multiple transmission opportunities.

Optionally, in this embodiment of the present application, the processing unit 520 is further configured to: determining the first transmission opportunity from a portion of the plurality of transmission opportunities.

Optionally, in this embodiment of the present application, the processing unit 520 is further configured to: and determining the part of transmission opportunities according to the priority of the triggering random access events.

Optionally, in this embodiment of the present application, if a first priority is higher than a second priority, the first starting point is earlier in the time domain than a second starting point, where the first starting point is the starting point of the partial transmission opportunity determined by the processing unit 520 according to the first priority, and the second starting point is the starting point of the partial transmission opportunity determined by the processing unit 520 according to the second priority.

Optionally, in this embodiment of the application, if the priority of the event triggering the terminal device to perform random access is greater than or equal to a preset priority, the part of the transmission opportunities is the first N transmission opportunities in the multiple transmission opportunities.

Optionally, in this embodiment of the present application, the communication unit 510 is further configured to: and sending first indication information to the terminal equipment, wherein the first indication information is used for indicating the N.

Optionally, in this embodiment of the present application, if the priority of the event that triggers the terminal device to perform random access is smaller than a preset priority, the part of the transmission opportunities is the last M transmission opportunities in the multiple transmission opportunities.

Optionally, in this embodiment of the present application, the communication unit 510 is further configured to: and sending second indication information to the terminal equipment, wherein the second indication information is used for indicating the M.

Optionally, in this embodiment of the present application, the communication unit 510 is further configured to: and sending third indication information to the terminal equipment, wherein the third indication information is used for indicating the priority of the triggering random access event.

Optionally, in this embodiment of the present application, the communication unit 510 is further configured to: and receiving the message 3 sent by the terminal equipment by utilizing the target transmission opportunity.

It should be understood that the network device 500 may correspond to the network device in the method 300, and the corresponding operations of the network device in the method 300 may be implemented, which are not described herein for brevity.

Fig. 13 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. The communication device 600 shown in fig. 13 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 13, the communication device 600 may further include a memory 620. From the memory 620, the processor 610 may call and run a computer program to implement the method in the embodiment of the present application.

The memory 620 may be a separate device from the processor 610 or may be integrated into the processor 610.

Optionally, as shown in fig. 13, the communication device 600 may further include a transceiver 630, and the processor 6710 may control the transceiver 630 to communicate with other devices, and specifically, may transmit information or data to other devices or receive information or data transmitted by other devices.

The transceiver 630 may include a transmitter and a receiver, among others. The transceiver 630 may further include one or more antennas.

Optionally, the communication device 600 may specifically be a network device in the embodiment of the present application, and the communication device 600 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 600 may specifically be a terminal device in the embodiment of the present application, and the communication device 600 may implement a corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Fig. 14 is a schematic configuration diagram of an apparatus according to an embodiment of the present application. The apparatus 700 shown in fig. 14 includes a processor 710, and the processor 710 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 14, the apparatus 700 may further include a memory 720. From the memory 720, the processor 710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 720 may be a separate device from the processor 710, or may be integrated into the processor 710.

Optionally, the apparatus 700 may further comprise an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the apparatus 700 may further comprise an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the apparatus may be applied to the terminal device in the embodiment of the present application, and the apparatus may implement the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described herein again.

Optionally, the apparatus may be applied to the network device in the embodiment of the present application, and the apparatus may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Alternatively, the apparatus 700 may be a chip. It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed 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 the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous link SDRAM (SLDRAM), and Direct Rambus 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 understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), synchronous Link DRAM (SLDRAM), direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 15 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. As shown in fig. 15, the communication system 800 includes a terminal device 810 and a network device 820.

The terminal device 810 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the network device 820 may be configured to implement the corresponding function implemented by the network device in the foregoing method, for brevity, which is not described herein again.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the terminal device in the embodiment of the present application, and the computer program instruction causes the computer to execute a corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the methods in the embodiments of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute a corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

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 implementation. 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 is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into 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 or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the 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 conceive of the changes or substitutions within the technical scope of the present application, and shall 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 (40)

1. A method of random access, the method comprising:

the method comprises the steps that terminal equipment receives a Random Access Response (RAR) sent by network equipment, wherein the RAR comprises a plurality of transmission opportunities for transmitting a message 3 in random access;

the terminal equipment carries out channel interception on the transmission opportunities behind the first transmission opportunity according to the first transmission opportunity in the plurality of transmission opportunities until the channel interception is successful;

the channel sensing, by the terminal device, for the transmission opportunity after the first transmission opportunity according to the first transmission opportunity of the plurality of transmission opportunities includes:

and the terminal equipment determines part of transmission opportunities from the plurality of transmission opportunities according to the priority of the triggering random access event, randomly selects the first transmission opportunity from the part of transmission opportunities, and carries out channel interception on the transmission opportunities after the first transmission opportunity.

2. The method of claim 1, wherein a first priority is higher than a second priority, and wherein a first starting point is earlier in time than a second starting point, wherein the first starting point is a starting point of the partial transmission opportunity determined by the terminal device according to the first priority, and wherein the second starting point is a starting point of the partial transmission opportunity determined by the terminal device according to the second priority.

3. The method of claim 1, wherein the partial transmission opportunities are first N transmission opportunities in the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is greater than or equal to a preset priority, where N is a positive integer.

4. The method according to claim 3, wherein the N is preset on the terminal device by a protocol, or wherein the N is configured by the network device.

5. The method of claim 1, wherein if the priority of the event triggering the terminal device to perform random access is less than a preset priority, the partial transmission opportunities are the last M transmission opportunities in the multiple transmission opportunities, and M is a positive integer.

6. The method of claim 5, wherein the M is pre-provisioned on the terminal device via a protocol or wherein the M is configured by the network device.

7. The method according to any of claims 1 to 6, wherein the priority of the triggering random access event is protocol specified or the priority of the triggering random access event is configured by the network device.

8. The method according to any one of claims 1 to 6, wherein the channel sensing by the terminal device for the transmission opportunity subsequent to the first transmission opportunity according to the first transmission opportunity of the plurality of transmission opportunities comprises:

and the terminal equipment takes the first transmission opportunity as a starting point and carries out channel interception sequentially aiming at the transmission opportunities after the first transmission opportunity.

9. The method according to any one of claims 1 to 6, further comprising:

and the terminal equipment sends the message 3 to the network equipment by using a target transmission opportunity, wherein the target transmission opportunity is a transmission opportunity corresponding to a channel which is successfully intercepted by the terminal equipment.

10. A method of random access, the method comprising:

a network device sends a Random Access Response (RAR) to a terminal device, wherein the RAR comprises a plurality of transmission opportunities for the terminal device to transmit a message 3 in random access;

the network device determining a target transmission opportunity for receiving the message 3 according to a first transmission opportunity of the plurality of transmission opportunities;

the network device determining, according to a first transmission opportunity of the plurality of transmission opportunities, a target transmission opportunity for receiving the message 3 comprises:

the network device determines a partial transmission opportunity from the plurality of transmission opportunities according to the priority of the triggering random access event, determines the first transmission opportunity from the partial transmission opportunity, and determines a target transmission opportunity for receiving the message 3 according to the first transmission opportunity.

11. The method of claim 10, wherein a first priority is higher than a second priority, and wherein a first starting point is earlier in time than a second starting point, wherein the first starting point is a starting point of the partial transmission opportunity determined by the network device according to the first priority, and wherein the second starting point is a starting point of the partial transmission opportunity determined by the network device according to the second priority.

12. The method of claim 10, wherein the partial transmission opportunities are the first N transmission opportunities of the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is greater than or equal to a preset priority.

13. The method of claim 12, further comprising:

and the network equipment sends first indication information to the terminal equipment, wherein the first indication information is used for indicating the N.

14. The method of claim 10, wherein the partial transmission opportunities are the last M transmission opportunities in the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is less than a preset priority.

15. The method of claim 14, further comprising:

and the network equipment sends second indication information to the terminal equipment, wherein the second indication information is used for indicating the M.

16. The method according to any one of claims 10 to 15, further comprising:

and the network equipment sends third indication information to the terminal equipment, wherein the third indication information is used for indicating the priority of the triggering random access event.

17. The method according to any one of claims 10 to 15, further comprising:

and the network equipment receives the message 3 sent by the terminal equipment by using the target transmission opportunity.

18. A terminal device, comprising:

a communication unit, configured to receive a random access response RAR sent by a network device, where the RAR includes multiple transmission opportunities for transmitting a message 3 in random access;

the processing unit is used for carrying out channel interception on the transmission opportunities after the first transmission opportunity according to the first transmission opportunity in the plurality of transmission opportunities until the channel interception is successful;

wherein the processing unit is specifically configured to: and according to the priority of the triggering random access event, determining partial transmission opportunities from the plurality of transmission opportunities, randomly selecting the first transmission opportunity from the partial transmission opportunities, and carrying out channel sensing on the transmission opportunities after the first transmission opportunity.

19. The terminal device of claim 18, wherein a first priority is higher than a second priority, and wherein a first starting point is earlier in time than a second starting point, wherein the first starting point is a starting point of the partial transmission opportunity determined by the processing unit according to the first priority, and wherein the second starting point is a starting point of the partial transmission opportunity determined by the processing unit according to the second priority.

20. The terminal device of claim 18, wherein the partial transmission opportunities are the first N transmission opportunities in the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is greater than or equal to a preset priority.

21. The terminal device of claim 20, wherein the N is pre-provisioned on the terminal device via a protocol or wherein the N is configured by the network device.

22. The terminal device of claim 18, wherein the partial transmission opportunities are the last M transmission opportunities in the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is less than a preset priority.

23. The terminal device of claim 22, wherein M is pre-provisioned on the terminal device via a protocol or configured by the network device.

24. The terminal device according to any of claims 18 to 23, wherein the priority of the triggering random access event is protocol specified or the priority of the triggering random access event is configured by the network device.

25. The terminal device according to any one of claims 18 to 23, wherein the processing unit is specifically configured to:

and taking the first transmission opportunity as a starting point, and sequentially carrying out channel sensing on the transmission opportunities after the first transmission opportunity.

26. The terminal device according to any of claims 18 to 23, wherein the communication unit is further configured to:

and sending the message 3 to the network equipment by using a target transmission opportunity, wherein the target transmission opportunity is a transmission opportunity corresponding to a channel which is successfully intercepted by the terminal equipment.

27. A network device, comprising:

a communication unit, configured to send a random access response RAR to a terminal device, where the RAR includes multiple transmission opportunities for the terminal device to transmit a message 3 in random access;

a processing unit configured to determine a target transmission opportunity for receiving the message 3 according to a first transmission opportunity of the plurality of transmission opportunities;

wherein the processing unit is specifically configured to: determining a partial transmission opportunity from the plurality of transmission opportunities according to a priority of triggering a random access event, determining the first transmission opportunity in the partial transmission opportunity, and determining a target transmission opportunity for receiving the message 3 according to the first transmission opportunity.

28. The network device of claim 27, wherein a first priority is higher than a second priority, and wherein a first starting point is earlier in time than a second starting point, wherein the first starting point is a starting point of the partial transmission opportunity determined by the processing unit according to the first priority, and the second starting point is a starting point of the partial transmission opportunity determined by the processing unit according to the second priority.

29. The network device of claim 27, wherein the partial transmission opportunities are top N transmission opportunities of the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is greater than or equal to a preset priority.

30. The network device of claim 29, wherein the communication unit is further configured to:

and sending first indication information to the terminal equipment, wherein the first indication information is used for indicating the N.

31. The network device of claim 27, wherein the partial transmission opportunities are the last M transmission opportunities in the plurality of transmission opportunities if a priority of an event triggering the terminal device to perform random access is less than a preset priority.

32. The network device of claim 31, wherein the communication unit is further configured to:

and sending second indication information to the terminal equipment, wherein the second indication information is used for indicating the M.

33. The network device of any of claims 27-32, wherein the communication unit is further configured to:

and sending third indication information to the terminal equipment, wherein the third indication information is used for indicating the priority of the triggering random access event.

34. The network device of any of claims 27-32, wherein the communication unit is further configured to:

and receiving the message 3 sent by the terminal equipment by utilizing the target transmission opportunity.

35. A terminal device, comprising: a processor and a memory for storing a computer program, the processor for invoking and executing the computer program stored in the memory, performing the method of any one of claims 1 to 9.

36. A network device, comprising: a processor and a memory for storing a computer program, the processor for invoking and executing the computer program stored in the memory, performing the method of any one of claims 10 to 17.

37. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 1 to 9.

38. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 10 to 17.

39. A computer-readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 9.

40. A computer-readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 10 to 17.

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