CN110650486B - A random access method, user equipment and device with storage function - Google Patents

Abstract

The invention discloses a random access method, user equipment and a device with a storage function. The random access method comprises the following steps: in the random access process, the user equipment sends a request message to a base station; starting a first timer and a second timer to start timing; carrying out idle channel assessment on the current channel, if the current channel is available, continuing timing by the second timer, if the current channel is unavailable, pausing timing by the second timer, and meanwhile, keeping the timing state by the first timer no matter whether the current channel is available or not; if the timing of the first timer and/or the second timer reaches the preset time threshold, the user equipment does not receive a response message sent by the base station, and then the random access is judged to fail. Through the mode, the random access efficiency can be improved.

Description

A random access method, user equipment and device with storage function

technical field

The present invention relates to the field of communications, and in particular, to a random access method, user equipment and a device with a storage function.

Background technique

In the current wireless communication technology, the problem of frequency band shortage is becoming more and more serious, and the method of communication in the unlicensed frequency band can be used to increase the available frequency band to solve this problem. In a mobile communication system based on an LTE (Long Term Evolution, Long Term Evolution) network, LAA (License Assisted Access, Licensed Spectrum Assisted Access) technology is adopted to use an unlicensed frequency band with the assistance of a licensed frequency band.

With the popularization of 5G NR (New Radio, new air interface) network, it is necessary to enhance the scenario of unlicensed frequency band access in the 5G NR system. In the new 5G NR application scenario, user equipment needs to complete random access to unlicensed frequency bands. In order to ensure fair communication with Wi-Fi, Bluetooth, LTE-U and other nodes, LBT (Listen before Talk) mechanism is introduced when using unlicensed frequency bands. Since LBT cannot determine the time slot for transmission, the efficiency of random access will be affected.

SUMMARY OF THE INVENTION

The technical problem mainly solved by the present invention is to provide a random access acquisition, user equipment and a device with a storage function, which can improve the efficiency of random access.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a random access method, including: the user equipment sends a request message to the base station; starts the first timer and the second timer to start timing; Perform an idle channel evaluation, if the current channel is available, the second timer continues to count, if the current channel is unavailable, the second timer is suspended, and regardless of whether the current channel is available, all the first timer keeps the timing state; if the first timer and/or the second timer reaches its preset time threshold and reaches the preset time threshold, the user equipment does not receive the response sent by the base station message, it is determined that this random access fails.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a user equipment, including: a processor, a communication circuit and a memory, the processor is coupled to the communication circuit and the memory, and the memory Program instructions are stored in the processor, the processor executes the program instructions, and the method as described above is implemented through the communication circuit.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a device with a storage function, which is characterized in that data instructions are stored, and the data instructions are used to be executed to implement the above method.

The beneficial effects of the present invention are: different from the situation in the prior art, the present invention sets two timers for timing after sending the request message to the base station, adjusts the waiting time of the user equipment based on the communication quality of the current channel, and can quickly determine The occurrence of random access failure reduces the waiting time of the user equipment, thereby improving the efficiency of random access.

Description of drawings

1 is a schematic flowchart of a first embodiment of a random access method provided by the present invention;

2 is a schematic flowchart of a second embodiment of a random access method provided by the present invention;

3 is a schematic flowchart of a third embodiment of a random access method provided by the present invention;

4 is a schematic flowchart of a fourth embodiment of a random access method provided by the present invention;

5 is a schematic structural diagram of an embodiment of a user equipment provided by the present invention;

FIG. 6 is a schematic structural diagram of a device with a storage function provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of the first embodiment of the random access method provided by the present invention. As shown in FIG. 1, the random access method of the present invention includes:

S101: The user equipment sends a request message to the base station.

The random access process refers to the process in which the user equipment discovers the downlink signal, synchronizes with the base station, decodes the broadcast information of the base station, and completes the first uplink transmission. In a specific implementation scenario, the current communication requirements cannot be met by relying on the licensed frequency band, and the user equipment needs to complete the random access process based on the NR unlicensed frequency band. The user equipment sends a request message to the base station to indicate the existence of the random access request to the base station and allow the base station to estimate the delay between the base station and the user equipment.

In this implementation scenario, the message sent by the user terminal needs to be sent to the base station at the selected timing with the determined transmission power and transmission format. In this implementation scenario, the transmission format can be determined based on the broadcast system information, the transmission power is estimated according to the downlink path loss in the downlink reference signal or the control signal, and the transmission timing is randomly selected. In this implementation scenario, the request message includes a first message and a third message, the first message includes a group of preamble sequences selected from contention preambles, and the third message includes at least one of a radio resource control connection request and a plan request item and the temporary identity of the cell wireless network. The decoding difficulty of the preamble sequence is relatively low, so that the base station can quickly decode the preamble after receiving the preamble to obtain the information contained therein.

In other implementation scenarios, the request message may include only the first message or only the third message.

The NR-based unlicensed frequency band access scenarios referred to in this implementation scenario include:

Carrier aggregation between NR cells (primary cells) in licensed bands and NR cells (secondary cells) in unlicensed bands, where NR cells (secondary cells) in unlicensed bands can include both uplink and downlink, or only including downlink;

Dual connectivity between the LTE cell (primary cell) in the licensed band and the NR cell (secondary cell) in the unlicensed band;

NR cells in independent unlicensed bands;

NR cells with downlink in unlicensed band and uplink in licensed band;

Scenarios such as dual connectivity between an NR cell (primary cell) in a licensed band and an NR cell (secondary cell) in an unlicensed band.

In this implementation scenario, both the user equipment and the base station work in the unlicensed frequency band. In other implementation scenarios, only one of the user equipment and the base station may work in the unlicensed frequency band, the other in the licensed frequency band, or both work in the unlicensed frequency band. Licensed frequency bands.

S102: Start the first timer and the second timer to start timing.

In this implementation scenario, the user equipment starts the first timer and the second timer at the same time immediately after sending the random access request. In the unlicensed frequency band, the frame length of the LTE-based unlicensed frequency band access data packet is as high as 10ms, while the frame length of the IEEE802.11a/g/n/ac data packet is close to 6ms. Then, in the NR-based unlicensed frequency band access, the timing duration of timer 1 must be set to a time greater than 10 ms. In this implementation scenario, the time duration of the first timer is greater than 10ms, and the duration of the second timer is less than 1ms.

S103: Perform idle channel evaluation on the current channel, if the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer suspends time, and regardless of the current channel Whether the channel is available, the first timer keeps timing.

In a specific implementation scenario, the user equipment performs CAA (Clear ChannelAssessment, idle channel assessment) on the current channel. The principle of clear channel assessment is similar to energy detection, and its purpose is to estimate whether the target channel is free. The methods of free channel evaluation mainly include detecting whether the energy exceeds the set threshold (at least 10dB above the receiver sensitivity), or detecting whether there is a signal in the channel that follows IEEE 802.11, IEEE 802.15.4, Bluetooth, and LTE-U. Signals exceeding the set threshold, or signals conforming to standards such as IEEE 802.11, IEEE 802.15.4, Bluetooth, LTE-U, etc., are considered to be busy, and the channel is currently unavailable. Since the idle channel evaluation method is in the prior art, it will not be described in detail here to avoid redundancy.

After receiving the request message sent by the user equipment, if decoding the request message is successful, the base station will send a response message to the user equipment to notify the user equipment that a random access connection can be established. If the user equipment does not receive the response message, the possible reasons include that the base station cannot obtain a channel through LBT, sends the response message to the user equipment and the base station fails to receive the request message successfully. In this implementation scenario, the user equipment performs idle channel detection to determine whether the current channel is available, and the second timer is used to limit the waiting time of the user equipment when the current channel is available. Because if the current channel is unavailable, even if the base station successfully receives the request message, it cannot send the response message to the user equipment, so the second timer is suspended. If the current channel is available, the base station can send a response message to the user equipment, so the second timer continues to count.

Meanwhile, regardless of whether the current channel is available or not, the first timer keeps timing. The first timer is used to control the total waiting time of the user equipment.

S104: If the first timer and/or the second timer reaches its preset time threshold and the user equipment does not receive the response message sent by the base station, determine that the random access fails this time.

In this implementation scenario, if the user equipment does not receive the response message sent by the base station when either the first timer or the second timer reaches its preset time threshold, it is determined that the random access fails this time.

If the first timer reaches its preset time threshold, it means that the second timer has been suspended for a long time. Therefore, it can be inferred that the reasons for the random access failure include: the base station cannot obtain an available channel through the LBT to the user equipment. The random access response information is transmitted; if the second timer reaches its preset time threshold, it means that the current channel is available, so it can be inferred that the reasons for the random access failure include: insufficient transmission power, and random access with other user equipment. At least one of the access frequency band conflict, the conflict with other wireless transmission modes using the same frequency band, the random access response information sent by the base station and the conflict with other terminals.

In this implementation scenario, after the user equipment determines that the random access fails this time, steps S101-S103 are repeatedly performed until the first timer and the second timer reach their preset time thresholds, and a response sent by the base station is received. information.

In order to improve the efficiency of random access and avoid the situation in which the user equipment repeatedly sends request messages to the base station, each time step S101 is performed, the number of request message sending times is increased by one, and when the number of request message sending times reaches a preset threshold (for example, 5 times) , 10 times, etc.), stop the random access method.

In this implementation scenario, the response message includes a second message and a fourth message, and the second message includes: time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier) and uplink allocation resources (for example, , at least one of the uplink grants). The fourth message includes: Competitive Solutions.

In other implementation scenarios, the response message may also include only the second message or only the fourth message. When the request message sent by the user equipment includes only the first message, the response message only includes the second message, and when the request message sent by the user equipment includes only the second message When only the third message is included, the response message includes only the fourth message.

As can be seen from the above description, in this embodiment, by starting the first timer and the second timer after the user equipment sends a request message to the base station, it is possible to flexibly control the time for the user equipment to wait for the response message sent by the base station by monitoring the channel communication state, and quickly Determining that random access fails can effectively shorten the waiting time, thereby improving the efficiency of random access. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart of a second embodiment of the random access method provided by the present invention. As shown in FIG. 2, the random access method of the present invention includes:

S201: The user equipment sends the first message to the base station.

S202: Start the first timer and the second timer to start timing.

S203: Perform an idle channel evaluation on the current channel, if the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer suspends time, and regardless of the current Whether the channel is available, the first timer keeps timing.

Steps S201-S203 are basically the same as steps S101-S103 of the first embodiment of the random access method provided by the present invention, which is equivalent to that the request message in steps S101-S103 only includes the first message, and the response message only includes the third message, Therefore, no further description is given here.

S204: If the user equipment receives the second message sent by the base station before the first timer and/or the second timer expires when the timing reaches its preset threshold, the first timer and/or the second timer expires. The second timer stops timing.

In a specific implementation scenario, before the first timer and the second timer reach their preset thresholds, the user equipment receives the second message sent by the base station, indicating that it can request the base station for unlicensed frequency band access. In order for the subsequent random access method to proceed smoothly, the first timer and the second timer stop timing. In this implementation scenario, the second message includes at least one of time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier, cell radio network temporary identifier) and uplink allocation resources.

S205: The user equipment sends a third message to the base station by using the uplink allocation resource.

In this implementation scenario, the user equipment sends the third message to the base station using the uplink allocated resources received in step S204. In this implementation scenario, the third message includes at least one of a radio resource control connection request and a plan request and the cell radio network temporary identifier temporarily allocated to the user equipment received in step S204.

S206: Clear the first timer and the second timer to zero, and start the first timer and the second timer to start timing.

In this implementation scenario, in step S204, the user equipment suspends the timing of the first timer and the second timer because the user equipment receives the response message sent by the base station. At this time, the user equipment clears the first timer and the second timer. zero, restart the timer. In other implementation scenarios, in step 204, the first timer and the second timer may be directly cleared, and in this step, the first timer and the second timer may be directly started.

S207: Perform idle channel evaluation on the current channel, if the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer is suspended, and no matter what Whether the current channel is available, the first timer keeps a timing state.

Because the communication quality of the random access in the unlicensed frequency band is not very stable, after the third message is sent to the base station, the communication state of the current channel is evaluated again. This step is basically similar to step S203, and will not be repeated here.

S208: When the first timer and/or the second timer reaches its preset time threshold, if the user equipment does not receive the fourth message sent by the base station, determine this random access fail.

In this implementation scenario, the base station may simultaneously receive second messages sent by multiple user equipments with the same preamble sequence, and the base station will select one user equipment from the multiple user equipments and send the fourth message to it , to notify the user equipment that it can communicate in the unlicensed frequency band. In this implementation scenario, the fourth message includes a contention resolution solution, such as an identifier of the selected user equipment or an identifier of a contention resolution method. The user equipment can learn that random access communication can be performed in the unlicensed frequency band according to the contention solution.

In this implementation scenario, when any one of the first timer and the second timer reaches its preset threshold, it can be determined that the random access fails this time. If the timing of the first timer reaches its preset threshold, it means that the second timer has been in a suspended state for a long time. Therefore, it can be inferred that the reasons for the random access failure include: the base station cannot obtain an available channel to transmit the fourth information to the user equipment ; If the timing of the second timer reaches its preset threshold, it means that the current channel is available, so it can be inferred that the reasons for the random access failure include: insufficient transmission power, conflict with other user equipment in the random access frequency band, and At least one of the conflict between other wireless transmission modes using the same frequency band and the conflict between the random access response information sent by the base station and other terminals.

In this implementation scenario, after the user equipment determines that the random access fails this time, steps S201-S207 are repeatedly performed, until the first timer and the second timer reach their preset thresholds, and the fourth timer sent by the base station is received. information.

In order to improve the efficiency of random access and avoid the situation that the user equipment repeatedly sends the first message to the base station, each time step S201 is performed, the number of times of sending the first message is increased by one, and when the number of times of sending the first message reaches the preset threshold (eg, 5 times, 10 times, etc.), stop the random access procedure.

In another implementation scenario, before either the first timer or the second timer reaches its preset time threshold, the user equipment determines that the random access is successful this time after receiving the fourth message sent by the base station.

It can be seen from the above description that in this embodiment, after the user equipment sends the first message and the third message to the base station, both the first timer and the second timer are started, and the first timer is used to control the user equipment to wait for the base station to wait for the base station based on the received The total time of the response message sent by the message, the second timer is used to control the time of the user equipment waiting for the response message when the channel state is good, the waiting time can be flexibly adjusted, and the random access failure can be quickly judged. Waste in waiting time, thereby improving the efficiency of random access. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart of a third embodiment of the random access method provided by the present invention. As shown in FIG. 3, the random access method of the present invention includes:

S301: The user equipment sends a first message to the base station.

In a specific implementation scenario, the current communication requirements cannot be met by relying on the licensed frequency band, and the user equipment needs to complete the random access procedure based on the NR unlicensed frequency band. The user equipment sends the first message to the base station to indicate the existence of the random access request to the base station and allow the base station to estimate the delay between the base station and the user equipment.

In this implementation scenario, the first message includes a group of preamble sequences selected from the contention preambles. The transmission format may be determined based on the broadcast system information, the transmission power may be estimated according to the downlink path loss in the downlink reference signal or the control signal, and the transmission timing may be randomly selected. In this implementation scenario, the first message needs to be sent to the base station at the selected timing with the determined transmission power and transmission format.

S302: Start the first timer and the second timer to start timing.

In this implementation scenario, an idle channel evaluation is performed on the current channel. If the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer is suspended. At the same time, regardless of whether the current channel is available, the first timer The timer keeps timing.

In this implementation scenario, the time duration of the first timer is greater than 10ms, and the duration of the second timer is less than 1ms.

S303: The base station sends the second message to the user equipment.

In this implementation scenario, the base station sends a second message to the user equipment based on the preamble sequence detected at a certain opportunity, where the second message includes: time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier, cell radio network temporary identifier, cell radio network temporary identifier) ) and at least one of uplink allocation resources (eg, uplink grants).

If the user equipment receives the second message sent by the base station before the timing of the first timer and/or the second timer reaches its preset threshold, the first timer and the second timer stop timing.

If the user equipment does not receive the second message sent by the base station when the first timer and/or the second timer reaches its preset threshold, it is determined that this random access fails. In this implementation scenario, after the user equipment determines that the random access fails this time, steps S301-S302 are repeatedly performed until the first timer and the second timer reach their preset time thresholds, and the user equipment receives the first sent by the base station. Two news.

S304: The user equipment sends a third message to the base station.

In this implementation scenario, the user equipment sends a third message to the base station by using the uplink allocation resource. The third message includes at least one of a radio resource control connection request and a plan request and a cell radio network temporary identity temporarily allocated to the user equipment in the received second message.

S305: Clear the first timer and the second timer to zero, and start the first timer and the second timer to start timing.

In this implementation scenario, the first timer and the second timer are reset to zero, and the first timer and the second timer are started to start timing. An idle channel evaluation is performed on the current channel. If the current channel is available, the second timer continues to count. If the current channel is unavailable, the second timer is suspended. At the same time, regardless of whether the current channel is available, the first timer keeps counting.

In this implementation scenario, the time duration of the first timer is greater than 10ms, and the duration of the second timer is less than 1ms.

S306: The base station sends a fourth message to the user equipment.

In this implementation scenario, the base station may simultaneously receive third messages sent by multiple user equipments with the same preamble sequence, and the base station will select one user equipment from the multiple user equipments and send the fourth message to it , to notify the user equipment that it can communicate in the unlicensed frequency band. In this implementation scenario, the fourth message includes a contention resolution solution, such as an identifier of the selected user equipment or an identifier of a contention resolution method. The user equipment can learn that random access communication can be performed in the unlicensed frequency band according to the contention solution.

If the user equipment receives the fourth message sent by the base station before the first timer and/or the second timer reaches its preset time threshold, the random access is successful this time.

If the user equipment does not receive the fourth message sent by the base station when the first timer and/or the second timer reaches its preset time threshold, it is determined that the random access has failed this time. In this implementation scenario, after the user equipment determines that the random access fails this time, steps S301-S305 are repeatedly performed until the first timer and the second timer reach the preset time threshold, and the fourth time sent by the base station is received. information.

It can be seen from the above description that in this implementation, when the random access based on the unlicensed frequency band is established, after the first message and the second message are sent to the base station, the first timer and the second timer are started to start timing, and the first timer uses In order to control the total waiting time of the user equipment waiting for the response message from the base station, the second timer is used to control the waiting time of the user equipment waiting for the response message from the base station when the channel communication state is good. In this way, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be quickly determined, the unnecessary waiting time can be solved, and the efficiency of the random access can be improved. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Please refer to FIG. 4. FIG. 4 is a schematic flowchart of a third embodiment of the random access method provided by the present invention. As shown in FIG. 4, the random access method of the present invention includes:

S401: The user equipment simultaneously sends the first message and the third message to the base station.

In a specific implementation scenario, only relying on the licensed frequency band can no longer meet the current communication requirements, and the user equipment needs to complete the random access procedure based on the NR unlicensed frequency band. The user equipment sends the first message to the base station to indicate the existence of the random access request to the base station and allow the base station to estimate the delay between the base station and the user equipment.

In this implementation scenario, the first message includes a group of preamble sequences selected from the contention preambles. The transmission format may be determined based on the broadcast system information, the transmission power may be estimated according to the downlink path loss in the downlink reference signal or the control signal, and the transmission timing may be randomly selected. In this implementation scenario, the first message needs to be sent to the base station at the selected timing with the determined transmission power and transmission format. The third message includes at least one of a radio resource control connection request and a plan request and a cell radio network temporary identity temporarily allocated to the user equipment.

S402: Start the first timer and the second timer to start timing.

In this implementation scenario, an idle channel evaluation is performed on the current channel. If the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer is suspended. At the same time, regardless of whether the current channel is available, the first timer The timer keeps timing.

In this implementation scenario, the time duration of the first timer is greater than 10ms, and the duration of the second timer is less than 1ms.

S403: The base station simultaneously sends the second message and the fourth message to the user equipment.

In this implementation scenario, the base station sends a second message to the user equipment based on the preamble sequence detected at a certain timing, where the second message includes: time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier, cell radio network temporary identifier, cell radio network temporary identifier) ) and at least one of uplink allocation resources (eg, uplink grants). The fourth message includes the contention resolution, such as the identification of the selected user equipment or the identification of the contention resolution method. The user equipment can learn that random access communication can be performed in the unlicensed frequency band according to the contention solution.

If the user equipment receives the second message and the fourth message sent by the base station before the first timer and/or the second timer reaches the preset time threshold, the random access is successful this time.

If the user equipment does not receive the second message and the fourth message sent by the base station when the first timer and/or the second timer reaches its preset time threshold, it is determined that this random access fails. In this implementation scenario, after the user equipment determines that the random access fails this time, steps S401-S402 are repeatedly performed until the first timer and the second timer reach their preset time thresholds, and the first timer and the second timer are received. The second message and the fourth message.

It can be seen from the above description that in this implementation, when the random access based on the unlicensed frequency band is established, after sending the first message and the third message to the base station, the first timer and the second timer are started to start timing, and the first timer uses In order to control the total waiting time for the user equipment to wait for the response message from the base station, the second timer is used to control the waiting time for the user equipment to wait for the corresponding response message from the base station when the channel communication state is good. In this way, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be quickly determined, the unnecessary waiting time can be solved, and the efficiency of the random access can be improved. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of an embodiment of a user equipment provided by the present invention. The user equipment 10 includes a processor 11, a memory 12 and a communication circuit 13 coupled to each other, the memory 12 is used for storing program data, and the processor 11 is used for running the program data in the memory 12 to control the communication circuit 13 to communicate and perform the following random operations: Access method:

The processor 11 of the user equipment 10 sends the request message to the base station through the communication circuit 13 . The processor 11 starts the first timer and the second timer to start timing. The processor 11 performs an idle channel evaluation on the current channel through the communication circuit 13. If the current channel is available, the processor 11 controls the second timer to continue timing, and if the current channel is unavailable, the processor 11 controls the second timer to suspend timing. At the same time, the processor 11 controls the first timer to keep the timing state regardless of whether the current channel is available or not. If the user equipment 10 does not receive the response message sent by the base station through the communication circuit 13 when the first timer and/or the second timer reaches its preset time threshold, the processor 11 determines that the random access fails this time.

Before any one of the first timer and the second timer reaches the preset time threshold, the user equipment 10 determines that the random access is successful after receiving the response message sent by the base station through the communication circuit 13 .

The specific process of implementing the above functions by the processor 11 may refer to the above method embodiments.

It can be seen from the above description that the user terminal in this embodiment can start the first timer and the second timer to start timing by sending a request message to the base station, and the first timer is used to control the user equipment to wait for the total number of response messages from the base station. The waiting time, the second timer is used to control the waiting time for the user equipment to wait for a corresponding response message from the base station when the channel communication state is good. In this way, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be quickly determined, the unnecessary waiting time can be solved, and the efficiency of the random access can be improved. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of an embodiment of an apparatus with a storage function provided by the present invention. At least one program instruction 21 is stored in the device 20 with a storage function, and the program instruction 21 is used to execute the random access method shown in FIG. 1 to FIG. 4 . In one embodiment, the device with a storage function may be a storage chip in the terminal, a hard disk, or a mobile hard disk or other readable and writable storage tools such as a USB flash drive or an optical disk, or a server or the like.

It can be seen from the above description that the programs or instructions stored in the device embodiment with a storage function in this embodiment can be used to flexibly adjust the waiting time of the user equipment, can quickly determine the random access failure, and solve the unnecessary waiting time , thereby improving the efficiency of random access. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

Different from the prior art that only uses a traditional timer to control the waiting time of the user waiting for the response message from the base station, the present invention starts the first timer and the second timer after the user equipment sends the request message to the base station. The second timer is used to control the total time that the user equipment waits for the corresponding response message sent by the base station based on the received message, and the second timer is used to control the time that the user equipment waits for the corresponding response message when the channel state is good, which can be flexible By adjusting the waiting time, the random access failure can be quickly determined, the waste of waiting time is reduced, and the efficiency of random access is improved. And the reason for the random access failure can be roughly judged according to whether the first timer reaches its preset time threshold or the second timer reaches its preset time threshold.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (15)

1. A random access method, comprising: The user equipment sends the request message to the base station; Start the first timer and the second timer to start timing; Perform an idle channel evaluation on the current channel, if the current channel is available, the second timer continues to count, and if the current channel is unavailable, the second timer suspends timing, regardless of whether the current channel is available, the first timer keeps the timing state; If the first timer and/or the second timer reaches its preset time threshold and the user equipment does not receive the response message sent by the base station, it is determined that this random access fails; Wherein, after it is determined that the random access fails this time, the method further includes: Repeating the sending of the request message to the base station and subsequent steps; Wherein, the method also includes: Each time the step of sending the request message to the base station is performed, the number of times the request message is sent is incremented by one, and when the number of times the request message is sent reaches a preset threshold, the random access process is stopped. 2. The method according to claim 1, wherein The request message includes: a first message, and the first message includes: a preamble sequence; The sending the request message to the base station includes: The first message is sent to the base station at the selected timing with the determined transmission power and transmission format. 3. The method of claim 2, wherein The preamble sequence is a set of preamble sequences selected from competing preambles. 4. The method according to claim 2, wherein The transport format is determined based on broadcast system information. 5. The method of claim 2, wherein The transmission power is estimated from the downlink path loss in the downlink reference signal or control signal. 6. The method of claim 2, wherein The timing is a randomly selected timing. 7. The method of claim 1, wherein, The response message includes: a second message, where the second message includes at least one of time adjustment information, a cell wireless network temporary identity, and uplink allocation resources. 8. The method of claim 1, wherein: The request message includes: a third message, where the third message includes: at least one of a radio resource control connection request and a plan request, and a cell radio network temporary identifier; Before the sending the request message to the base station, include: receiving a second message sent by the base station; The sending the request message to the base station includes: The third message is sent to the base station in response to the second message. 9. The method of claim 1, wherein The response message includes: a fourth message, and the fourth message includes: a contention solution. 10. The method of claim 1, wherein: The request message includes: a first message and a third message; The sending the request message to the base station includes: The first message and the third message are sent to the base station. 11. The method of claim 10, wherein: The response message includes: a second message and a fourth message. 12. The method of claim 1, wherein the method further comprises: If the user equipment receives the response message sent by the base station before the first timer and/or the second timer reaches its preset time threshold, it is determined that the random access is successful this time. 13. The method according to any one of claims 1-12, wherein the user equipment and the base station operate in an unlicensed frequency band. 14. A user equipment, comprising: a processor, a communication circuit and a memory, the processor is coupled to the communication circuit and the memory, and program instructions are stored in the memory, and the processor executes The program instruction implements the method according to any one of claims 1-13 through the communication circuit. 15. An apparatus with a storage function, characterized in that data instructions are stored, and the data instructions are used to be executed to implement the method according to any one of claims 1-13.

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