WO2019127285A1 - Method and device for random access - Google Patents

Abstract

Disclosed are a method and device for random access. The method is applied to a terminal device working on an unlicensed frequency band, and the terminal device is configured with a random access response (RAR) receiving window. The method comprises: if the terminal device does not receive an RAR on a carrier of the unlicensed frequency band within a first duration, the terminal device re-determining the duration of the RAR receiving window, wherein the first duration is a current duration of the RAR receiving window; the terminal device re-transmitting a random access preamble to a network device; and the terminal device receiving the RAR again within a range of the re-determined duration of the RAR receiving window.

Description

Method and device for random access Technical field

Embodiments of the present application relate to the field of communications and, more particularly, to methods and apparatus for random access.

Background technique

The terminal device needs to meet the requirements of the unlicensed spectrum for data transmission on the unlicensed spectrum. For example, the terminal device needs to follow the principle of “Listen Before Talk (LBT)”, that is, the terminal device is on the channel of the unlicensed spectrum. Before performing signal transmission, channel interception needs to be performed first. Only when the channel listening result is that the channel is idle, the terminal device can perform signal transmission; if the channel listening result is that the channel is busy, the terminal device cannot perform signal transmission.

Therefore, in the random access process, the terminal device and the network device need to preempt the right to use the channel before the information can be exchanged. Therefore, there may be a problem that the random access fails due to the failure of the LBT.

Summary of the invention

A method and device for random access are provided, which is beneficial to improving the probability of successful random access.

The first aspect provides a method for random access, which is applied to a terminal device that operates in an unlicensed frequency band, where the terminal device is configured with a random access response RAR receiving window, and the method includes:

If the terminal device does not receive the RAR on the carrier of the unlicensed frequency band, the terminal device re-determines the duration of the RAR receiving window, where the first duration is the The current duration of the RAR receiving window;

Transmitting, by the terminal device, a random access preamble to the network device;

The terminal device receives the RAR again within a range of durations of the re-determined RAR receiving window.

Therefore, in the method for random access in the embodiment of the present application, the terminal device may re-determine the duration of the RAR receiving window in the case that the RAR reception fails, and further, may receive the re-determined RAR when receiving the RAR next time. RAR reception is performed within the duration of the window. Therefore, it is advantageous to improve the probability of successful RAR reception, thereby improving the probability of successful random access.

In some possible implementation manners, the determining, by the terminal device, the duration of the RAR receiving window includes:

The terminal device determines the sum of the first duration and the offset duration as the duration of the RAR receiving window.

Optionally, in the embodiment of the present application, the determining, by the terminal device, the duration of the RAR receiving window includes:

The length of time obtained by the terminal device multiplying the first duration by the first ratio is determined as the duration of the RAR receiving window, wherein the first ratio is greater than 1.

That is, the terminal device may determine the duration of the RAR reception window when the RAR reception is performed next time by multiplying the duration of the current RAR reception window by a specific ratio.

In some possible implementation manners, the first duration is an initial configuration duration of the RAR receiving window, or the first duration is the initial configuration duration plus n the offset durations, where n is positive Integer.

In some possible implementations, the offset duration is pre-configured on the terminal device or configured by the network to the terminal device.

In some possible implementations, the duration of the RAR receive window is less than or equal to the maximum duration.

In some possible implementations, the maximum duration is pre-configured on the terminal device or configured by the network to the terminal device.

In some possible implementations, the method further includes:

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in a special cell, the terminal device notifies the radio resource control that the RRC layer radio link fails; or

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated by the secondary cell, the terminal device determines that the random access fails.

In some possible implementation manners, the special cell includes a primary cell in a primary cell group MCG and/or a primary cell in a secondary cell group SCG.

In some possible implementation manners, if the terminal device does not receive the RAR within a duration of the RAR receiving window, the timer corresponding to the RAR receiving window is invalid.

A second aspect provides a method for random access, which is applied to a terminal device operating in an unlicensed frequency band, where the terminal device is configured with a random access response RAR receiving window, and the method includes: the terminal device Determining, according to a triggering event of the random access procedure, a duration of the RAR receiving window; the terminal device receiving the RAR within a determined duration of the RAR receiving window.

Therefore, in the method for random access in the embodiment of the present application, the terminal device can flexibly determine the duration of the RAR receiving window according to the triggering event of the random access procedure, which is beneficial to improving the probability of successful random access.

In some possible implementations, the determining, by the terminal device, the duration of the RAR receiving window according to a triggering event of the random access process, including:

Determining, by the terminal device, the duration of the RAR receiving window according to the triggering event of the random access process, where the first correspondence is the duration of the multiple triggering events and the multiple RAR receiving windows. Correspondence relationship.

In some possible implementation manners, the first correspondence is pre-configured on the terminal device or configured by the network to the terminal device.

In a third aspect, an apparatus for random access is provided for performing the method of any of the first aspect or the first aspect of the first aspect. In particular, the apparatus comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.

In a fourth aspect, an apparatus for random access is provided, the apparatus comprising: a memory, a processor, an input interface, and an output interface. The memory, the processor, the input interface, and the output interface are connected by a bus system. The memory is for storing instructions for executing the memory stored instructions for performing the method of any of the first aspect or the first aspect of the first aspect.

In a fifth aspect, an apparatus for random access is provided for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect. In particular, the apparatus comprises means for performing the method of any of the possible implementations of the second aspect or the second aspect described above.

In a sixth aspect, an apparatus for random access is provided, the apparatus comprising: a memory, a processor, an input interface, and an output interface. The memory, the processor, the input interface, and the output interface are connected by a bus system. The memory is for storing instructions for executing the memory stored instructions for performing the method of any of the possible implementations of the second aspect or the second aspect above.

In a seventh aspect, a computer storage medium is provided for storing computer software instructions for performing the method of any of the above first aspect or any of the possible implementations of the first aspect, comprising program.

In an eighth aspect, a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of any of the above-described first aspect or any of the alternative implementations of the first aspect.

A ninth aspect, a computer storage medium for storing computer software instructions for performing the method of any of the above second aspect or any of the possible implementations of the second aspect, comprising program.

In a tenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the alternative aspects of the second aspect or the second aspect.

DRAWINGS

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.

FIG. 2 is a schematic flowchart of a method for random access according to an embodiment of the present application.

FIG. 3 is a schematic flowchart of a method for random access according to another embodiment of the present application.

FIG. 4 shows a schematic block diagram of an apparatus for random access according to an embodiment of the present application.

FIG. 5 shows a schematic block diagram of an apparatus for random access according to another embodiment of the present application.

FIG. 6 shows a schematic block diagram of an apparatus for random access according to an embodiment of the present application.

FIG. 7 shows a schematic block diagram of a device for random access according to another embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

The technical solution of the embodiment of the present application can be applied to various communication systems, for example, a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) ) Communication systems or future 5G systems.

FIG. 1 shows a wireless communication system 100 to which an embodiment of the present application is applied. The wireless communication system 100 can include a network device 110. Network device 100 can be a device that communicates with a terminal device. Network device 100 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within the coverage area. Optionally, the network device 100 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the network. The device may be a relay station, an access point, an in-vehicle device, a wearable device, a network side device in a future 5G network, or a network device in a future evolved Public Land Mobile Network (PLMN).

The wireless communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. Terminal device 120 can be mobile or fixed. Optionally, the terminal device 120 may refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless communication. Device, user agent, or user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or terminal devices in future evolved PLMNs, and the like.

Alternatively, the 5G system or network may also be referred to as a New Radio (NR) system or network.

Optionally, the wireless communication system 100 may further include other network entities, such as a network controller, a mobility management entity, and the like.

FIG. 1 exemplarily shows one network device and two terminal devices. Alternatively, the wireless 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. The application embodiment does not limit this.

The random access technology is the primary content of communication between the terminal device and the network device in the mobile communication system. The terminal device in the wireless cellular network can initiate a connection request to the network side through a random access procedure.

For ease of understanding, a brief introduction to the random access process. The random access process mainly includes the following steps:

S1 is firstly used for the transmission of a random access preamble. The network device can be used to correctly estimate the transmission delay of the terminal device and solve the conflict problem that multiple terminal devices initiate the access request at the same time.

S2. The network device sends a random access response (RAR) to the terminal device, where the RAR includes a transmission delay required for uplink synchronization, and an access overload condition of the current system. In addition, the network device may also feed back the uplink resource location information allocated to the terminal device to the terminal device.

S3. The terminal device sends a message corresponding to the random access event and the terminal device identifier of the terminal device itself on the specified uplink resource.

S4. The network device feeds back the conflict resolution information to the terminal device.

After the terminal device sends the random access preamble (ie, Msg1), the terminal device starts a RAR receiving window (ra-Response Window), and the terminal device monitors the physical downlink control channel (Physical Downlink Control Channel) in the RAR receiving window. , PDCCH), to receive the RAR corresponding to the preamble (ie, Msg2), because the data transmission on the unlicensed resource needs to follow the LBT principle, which may cause the network device to fail in time due to the LBT failure within the time range of the RAR receiving window. Respond to RAR, which causes random access failure.

In view of this, the embodiment of the present application provides a method for random access, which is beneficial to improving the probability of random access success.

2 is a schematic flowchart of a method 200 for random access provided by an embodiment of the present application. The method 200 may be performed by a terminal device in a communication system. As shown in FIG. 2, the method 200 includes:

S210, if the terminal device does not receive the RAR on the carrier of the unlicensed frequency band, the terminal device redetermines the duration of the RAR receiving window, where the first duration is The current duration of the RAR receiving window;

S220: The terminal device retransmits a random access preamble to the network device.

S230. The terminal device receives the RAR again within a duration of the re-determined RAR receiving window.

It should be understood that the terminal device and the network device in the embodiment of the present application can work in an unlicensed frequency band, and data transmission on the unlicensed frequency band needs to follow the LBT principle, that is, data transmission can be performed only when the channel is idle.

Before the S210, the terminal device may send the first preamble on the carrier of the unlicensed band, and then start the RAR receiving window, where the current duration of the RAR receiving window is the first duration, so that the terminal device may be in the During the first time period, the PDCCH is monitored to receive the RAR replied by the network device, and if the terminal device does not receive the RAR replied by the network device within the first time period (possibly due to the failure of the network device LBT), The terminal device may re-determine the duration of the RAR receiving window. Optionally, the re-determined length of the RAR receiving window may be greater than the first duration, that is, the length of the adjusted RAR receiving window is greater than the current duration of the RAR receiving window.

After S210, if the terminal device determines that a random access procedure needs to be initiated under some conditions (for example, uplink out-of-synchronization), then in S220, the terminal device may send a random access preamble to the network device again. The first preamble and the second preamble may be the same or different, and the embodiment of the present application does not limit this. Further, in S230, the terminal device may receive the RAR again within a duration of the re-determined RAR receiving window, because the adjusted RAR receiving window has a longer duration than the RAR receiving window when the RAR fails to receive. Therefore, it is beneficial to improve the probability of successful RAR reception, thereby improving the probability of successful random access.

Optionally, in the embodiment of the present application, the determining, by the terminal device, the duration of the RAR receiving window includes:

The terminal device determines the sum of the first duration and the offset duration as the duration of the RAR receiving window.

That is, the length of time after the current RAR receiving window plus the specific offset duration (denoted as offset) can be determined as the duration of the RAR receiving window when the RAR is received next time, that is, T ₂ =T ₁ +offset, Where T ₂ is the duration of the RAR reception window when RAR reception is performed next time, and T ₁ is the current duration of the RAR reception window.

Optionally, in the embodiment of the present application, the determining, by the terminal device, the duration of the RAR receiving window includes:

The length of time obtained by the terminal device multiplying the first duration by the first ratio is determined as the duration of the RAR receiving window, wherein the first ratio is greater than 1.

That is, the terminal device may determine the duration of the RAR receiving window when the RAR is received next time by multiplying the duration of the current RAR receiving window by a specific ratio. By way of example and not limitation, the first ratio It can be 1.1 or 1.2, etc., and the embodiment of the present application does not limit this.

Optionally, in the embodiment of the present application, the first duration may be an initial configuration duration of the RAR receiving window, or may be a duration of the adjusted RAR receiving window, for example, the first duration may be the The initial configuration duration adds n of the offset durations, and the n is a positive integer.

Optionally, if the terminal device does not receive the RAR within the duration of the re-determined RAR receiving window, the terminal device may further adjust the RAR receiving window according to the manner described in the foregoing embodiment. Duration, the specific implementation process will not be described here. Optionally, the length of the adjusted RAR receiving window is not greater than the maximum duration, and the maximum duration may be pre-configured on the terminal device, or may be configured by the network device, which is not limited in this embodiment of the present application.

Optionally, in the embodiment of the present application, if the terminal device does not receive the RAR replied by the network device within the duration of the RAR receiving window, the timer corresponding to the RAR receiving window is invalid.

Optionally, in some embodiments, the method 200 may further include:

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in a special cell, the physical layer of the terminal device notifies the radio resource to control the RRC layer random access problem; or

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated by the secondary cell, the terminal device determines that the random access fails.

Specifically, the current random access procedure may be initiated in a special cell (SpCell) (denoted as scenario 1), and the SpCell may be a primary cell in a primary cell group (MCG), or may be The primary cell in the secondary cell group (SCG); or the current random access procedure may also be initiated by the secondary cell (Scell) (denoted as scenario 2).

Optionally, if the re-determined RAR receiving window has a longer duration than the maximum duration, and the current random access procedure is scenario 2, that is, the random access procedure is initiated by the Scell, the terminal device does not control the radio resource. The (Radio Resource Control, RRC) layer reports the random access problem, and can directly determine the random access failure. This scenario does not trigger the RRC connection reestablishment process.

Or, if the re-determined RAR receiving window has a longer duration than the maximum duration, and the current random access procedure is scenario 1, that is, the random access procedure is initiated by the SpCell, the media access control of the terminal device (Media Access) The Control, MAC) layer monitors the random access problem and then notifies the RRC layer random access problem of the terminal device through the inter-layer interaction within the terminal device.

Case 1: If the MCG MAC notifies the RRC layer (here, the MCG refers to the primary cell group of the Dual Connection (DC)), that is, the random access procedure is initiated by the MCG, the RRC layer considers that The radio link failure (RLF) of the MCG triggers the RRC connection reconfiguration process.

Case 2: If the SCG MAC notifies the RRC layer, that is, the random access procedure is initiated by the SCG, the RRC layer considers it to be the RLF of the SCG. In this case, the RRC layer does not trigger the RRC re-establishment process.

Therefore, in the method for random access in the embodiment of the present application, the terminal device may re-determine the duration of the RAR receiving window in the case that the RAR reception fails, and further, may receive the re-determined RAR when receiving the RAR next time. The RAR reception is performed within the duration of the window. Therefore, the probability of successful RAR reception is improved, and the probability of successful random access can be improved.

FIG. 3 is a schematic flowchart of a method 300 for random access according to another embodiment of the present application. The method 300 may be performed by a terminal device in the communication system shown in FIG. 1, as shown in FIG. Method 300 includes the following:

S310. The terminal device determines, according to a trigger event of the random access procedure, a duration of the RAR receiving window.

S320. The terminal device receives the RAR within a determined duration of the RAR receiving window.

It should be understood that the terminal device and the network device in the embodiment of the present application can work in an unlicensed frequency band, and data transmission on the unlicensed frequency band needs to follow the LBT principle, that is, data transmission can be performed only when the channel is idle.

In this embodiment, the terminal device may determine the duration of the RAR receiving window according to the triggering event of the random access procedure, so that after the terminal device can send the random access preamble to the network device, the terminal device may start. The RAR receives the window, and further, the RAR may be received within a determined duration of the RAR reception window.

Optionally, the triggering event of the random access procedure may include an RRC connection setup process, an RRC connection re-establishment process, a cell handover, an uplink out-of-synchronization, and the like, and a triggering event that needs to initiate a random access procedure, which is not limited in this embodiment. .

As an example and not by way of limitation, the duration of the RAR receiving window corresponding to the random access of the cell handover triggering may be shorter, and the duration of the RAR receiving window corresponding to the random access triggered by the uplink out-synchronization is longer, that is, the implementation of the present application For example, the size of the RAR receiving window may be determined according to the size of the random access difficulty, which is beneficial to improving the probability of successful random access.

Optionally, in the embodiment of the present application, the multiple trigger events may have a first correspondence with the durations of the multiple RAR receiving windows. For example, the first correspondence may be one-to-one, one-to-many, many-to-one. The embodiment of the present application does not limit this. The terminal device may determine the duration of the corresponding RAR receiving window according to the triggering event of the current random access procedure, and further, may receive the RAR within the duration of the RAR receiving window.

Optionally, in the embodiment of the present application, the duration of the RAR receiving window determined according to the triggering event may be fixed or adjustable, for example, if the trigger event of the current random access procedure is the first event, The terminal device does not receive the RAR in the duration of the current RAR receiving window, and if the trigger event of the next random access procedure is the first event, the terminal device may re-determine the RAR receiving. The length of the window, for example, the length of the RAR receiving window may be re-determined according to the method described in the method 200. Further, the RAR may be received according to the length of the re-determined RAR receiving window, and the specific implementation may refer to the foregoing embodiment. Related descriptions are not described here.

Optionally, in the embodiment of the present application, the first corresponding relationship is pre-configured on the terminal device, or is configured by the network to the terminal device, which is not limited in this embodiment of the present application.

Therefore, in the method for random access in the embodiment of the present application, the terminal device can flexibly determine the duration of the RAR receiving window according to the triggering event of the random access procedure, which is beneficial to improving the probability of successful random access.

The embodiment of the method of the present application is described in detail below with reference to FIG. 2 and FIG. 3 . The device embodiment of the present application is described in detail below with reference to FIG. 4 to FIG. 7 . It should be understood that the device embodiment and the method embodiment correspond to each other. The description of the method can be referred to the method embodiment.

FIG. 4 shows a schematic block diagram of an apparatus 400 for random access in accordance with an embodiment of the present application. As shown in FIG. 4, the device 400 includes:

The determining module 410 is configured to redetermine the duration of the RAR receiving window, where the device does not receive the RAR, on the carrier of the unlicensed frequency band, where the first duration is Receiving the current duration of the window for the RAR;

The communication module 420 is configured to retransmit the random access preamble to the network device, and receive the RAR again within a re-determined duration of the RAR receiving window.

Optionally, in some embodiments, the determining module 410 is specifically configured to:

The sum of the first duration and the offset duration is determined as the duration of the RAR receive window.

Optionally, in some embodiments, the first duration is an initial configuration duration of the RAR receiving window, or the first duration is the initial configured duration plus n the offset duration, the n Is a positive integer.

Optionally, in some embodiments, the offset duration is pre-configured on the device or configured by the network to the device.

Optionally, in some embodiments, the duration of the RAR receiving window is less than or equal to the maximum duration.

Optionally, in some embodiments, the maximum duration is pre-configured on the device or configured by the network to the device.

Optionally, in some embodiments, the communication module 420 is further configured to:

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in a special cell, notifying the radio resource control that the RRC layer radio link fails;

The determining module 410 is further configured to:

If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in the secondary cell, determining that the random access fails.

Optionally, in some embodiments, the special cell includes a primary cell in a primary cell group MCG and/or a primary cell in a secondary cell group SCG.

Optionally, in some embodiments, if the device does not receive the RAR within a duration of the RAR receiving window, a timer corresponding to the RAR receiving window fails.

It should be understood that the apparatus 400 for random access according to an embodiment of the present application may correspond to the terminal apparatus in the method embodiment of the present application, and the foregoing and other operations and/or functions of the respective units in the apparatus 400 are respectively implemented for The corresponding flow of the terminal device in the method 200 shown in FIG. 2 is not described here for brevity.

FIG. 5 is a schematic block diagram of an apparatus for random access according to an embodiment of the present application. The device 500 of Figure 5 includes:

a determining module 510, configured to determine a duration of the RAR receiving window according to a triggering event of the random access procedure;

The communication module 520 is configured to receive the RAR within a determined duration of the RAR receiving window.

Optionally, in some embodiments, the determining module 510 is specifically configured to:

And determining, according to the triggering event of the random access process, the duration of the RAR receiving window, where the first correspondence is a correspondence between the multiple triggering events and the duration of the multiple RAR receiving windows.

Optionally, in some embodiments, the first correspondence is pre-configured on the device or configured by the network to the device.

Specifically, the device 500 may correspond to (for example, may be configured or be itself) the terminal device described in the foregoing method 300, and each module or unit in the device 500 is used to execute the terminal device in the foregoing method 300, respectively. Each of the operations or processes performed is omitted here for the sake of avoiding redundancy.

As shown in FIG. 6, the embodiment of the present application further provides a device 600 for random access, which may be the device 400 in FIG. 4, which can be used to perform the method corresponding to the method 200 in FIG. The content of the terminal device. The device 600 includes an input interface 610, an output interface 620, a processor 630, and a memory 640. The input interface 610, the output interface 620, the processor 630, and the memory 640 can be connected by a bus system. The memory 640 is used to store programs, instructions or code. The processor 630 is configured to execute a program, an instruction or a code in the memory 640 to control the input interface 610 to receive a signal, control the output interface 620 to send a signal, and complete the operations in the foregoing method embodiments.

It should be understood that, in the embodiment of the present application, the processor 630 may be a central processing unit ("CPU"), and the processor 630 may also be other general-purpose processors, digital signal processors ( DSP), application specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 640 can include read only memory and random access memory and provides instructions and data to the processor 630. A portion of the memory 640 can also include a non-volatile random access memory. For example, the memory 640 can also store information of the device type.

In the implementation process, each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 630 or an instruction in a form of software. The content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 640, and the processor 630 reads the information in the memory 640 and completes the contents of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

In a specific implementation, the determining module 410 included in the device 400 of FIG. 4 may be implemented by the processor 630 of FIG. 6. The communication module 420 included in the device 400 of FIG. 4 may be configured by using the input interface 610 of FIG. The output interface 620 is implemented.

As shown in FIG. 7, the embodiment of the present application further provides a device 700 for random access, which may be the device 500 in FIG. 5, which can be used to perform the method corresponding to the method 300 in FIG. The content of the terminal device. The device 700 includes an input interface 710, an output interface 720, a processor 730, and a memory 740, and the input interface 710, the output interface 720, the processor 730, and the memory 740 can be connected by a bus system. The memory 740 is configured to store programs, instructions or code. The processor 730 is configured to execute a program, an instruction or a code in the memory 740 to control the input interface 710 to receive a signal, control the output interface 720 to send a signal, and complete the operations in the foregoing method embodiments.

It should be understood that, in the embodiment of the present application, the processor 730 may be a central processing unit ("CPU"), and the processor 730 may also be other general-purpose processors, digital signal processors ( DSP), application specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 740 can include read only memory and random access memory and provides instructions and data to the processor 730. A portion of the memory 740 can also include a non-volatile random access memory. For example, the memory 740 can also store information of the device type.

In the implementation process, each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 730 or an instruction in a form of software. The content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 740, and the processor 730 reads the information in the memory 740 and completes the contents of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

In a specific implementation, the determining module 510 included in the device 500 of FIG. 5 may be implemented by the processor 730 of FIG. 7. The communication module 520 included in the device 500 of FIG. 5 may be configured by using the input interface 710 of FIG. The output interface 720 is implemented.

The embodiment of the present application further provides a computer readable storage medium storing one or more programs, the one or more programs including instructions, when the portable electronic device is included in a plurality of applications When executed, the portable electronic device can be caused to perform the method of the embodiment shown in Figures 2 and 3.

The embodiment of the present application also proposes a computer program comprising instructions which, when executed by a computer, cause the computer to perform the corresponding flow of the method of the embodiment shown in Figures 2 and 3.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

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 device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims (24)

A method for random access, which is applied to a terminal device operating in an unlicensed frequency band, where the terminal device is configured with a random access response RAR receiving window, and the method includes: If the terminal device does not receive the RAR on the carrier of the unlicensed frequency band, the terminal device re-determines the duration of the RAR receiving window, where the first duration is the The current duration of the RAR receiving window; Transmitting, by the terminal device, a random access preamble to the network device; The terminal device receives the RAR again within a range of durations of the re-determined RAR receiving window. The method according to claim 1, wherein the determining, by the terminal device, the duration of the RAR receiving window comprises: The terminal device determines the sum of the first duration and the offset duration as the duration of the RAR receiving window. The method according to claim 2, wherein the first duration is an initial configuration duration of the RAR receiving window, or the first duration is the initial configuration duration plus n the offset durations, The n is a positive integer. The method according to claim 2 or 3, wherein the offset duration is pre-configured on the terminal device or configured by the network to the terminal device. The method according to any one of claims 1 to 4, characterized in that the duration of the RAR receiving window is less than or equal to the maximum duration. The method according to claim 5, wherein the maximum duration is pre-configured on the terminal device or configured by the network to the terminal device. The method according to claim 5 or 6, wherein the method further comprises: If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in a special cell, the terminal device notifies the radio resource control that the RRC layer radio link fails; or If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated by the secondary cell, the terminal device determines that the random access fails. The method according to claim 7, wherein the special cell comprises a primary cell in a primary cell group MCG and/or a primary cell in a secondary cell group SCG. The method according to any one of claims 1 to 8, wherein if the terminal device does not receive the RAR within a duration of the RAR receiving window, the timer corresponding to the RAR receiving window Invalid. A method for random access, which is applied to a terminal device operating in an unlicensed frequency band, where the terminal device is configured with a random access response RAR receiving window, and the method includes: Determining, by the terminal device, a duration of the RAR receiving window according to a trigger event of the random access procedure; The terminal device receives the RAR within a determined duration of the RAR receiving window. The method according to claim 10, wherein the terminal device determines the duration of the RAR receiving window according to a triggering event of the random access procedure, including: Determining, by the terminal device, the duration of the RAR receiving window according to the triggering event of the random access process, where the first correspondence is the duration of the multiple triggering events and the multiple RAR receiving windows. Correspondence relationship. The method according to claim 11, wherein the first correspondence is pre-configured on the terminal device or configured by the network to the terminal device. A device for random access, which is characterized in that it is applied to a terminal device that operates in an unlicensed frequency band, and the terminal device is configured with a random access response RAR receiving window, and the device includes: a determining module, configured to redetermine a duration of the RAR receiving window, where the device does not receive the RAR, on the carrier of the unlicensed frequency band, where the first duration is The current duration of the RAR receiving window; And a communication module, configured to retransmit the random access preamble to the network device, and receive the RAR again within a range of duration of the re-determined RAR receiving window. The device according to claim 13, wherein the determining module is specifically configured to: The sum of the first duration and the offset duration is determined as the duration of the RAR receive window. The device according to claim 14, wherein the first duration is an initial configuration duration of the RAR receiving window, or the first duration is the initial configuration duration plus n the offset durations, The n is a positive integer. The device according to claim 14 or 15, wherein the offset duration is pre-configured on the device or configured by the network to the device. The device according to any one of claims 13 to 16, wherein the duration of the RAR receiving window is less than or equal to the maximum duration. The device according to claim 17, wherein said maximum duration is pre-configured on said device or configured by said network to said device. The device according to claim 17 or 18, wherein the communication module is further configured to: If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in a special cell, notifying the radio resource control that the RRC layer radio link fails; The determining module is further configured to: If the re-determined length of the RAR receiving window is greater than the maximum duration, and the current random access procedure is initiated in the secondary cell, determining that the random access fails. The apparatus according to claim 19, wherein the special cell comprises a primary cell in a primary cell group MCG and/or a primary cell in a secondary cell group SCG. The device according to any one of claims 13 to 20, wherein if the device does not receive the RAR within a duration of the RAR receiving window, the timer corresponding to the RAR receiving window is invalid. . A device for random access, which is characterized in that it is applied to a terminal device operating in an unlicensed frequency band, and the device is configured with a random access response RAR receiving window, and the device includes: a determining module, configured to determine a duration of the RAR receiving window according to a triggering event of the random access process; And a communication module, configured to receive the RAR within a determined duration of the RAR receiving window. The device according to claim 22, wherein the determining module is specifically configured to: And determining, according to the triggering event of the random access process, the duration of the RAR receiving window, where the first correspondence is a correspondence between the multiple triggering events and the duration of the multiple RAR receiving windows. The device according to claim 23, wherein the first correspondence is pre-configured on the device or configured by the network to the device.

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