CN110650486B - Random access method, user equipment and device with storage function - Google Patents
Random access method, user equipment and device with storage function Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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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
Technical Field
The present invention relates to the field of communications, and in particular, to a random access method, a user equipment, and a device having a storage function.
Background
In the current wireless communication technology, the problem of frequency band shortage is becoming more serious, and the available frequency band can be increased by adopting a method of communication in an unlicensed frequency band to solve the problem. In a mobile communication system based on an LTE (Long Term Evolution) network, an LAA (licensed Assisted Access) technology is adopted to use an unlicensed frequency band with the assistance of an licensed frequency band.
With the popularization of a 5G NR (New Radio, New air interface) network, a scenario of enhancing unlicensed frequency band access in a 5G NR system is required. In a new application scenario of 5G NR, a user equipment needs to complete random access of an unlicensed frequency band. In order to ensure fair communication with Wi-Fi, Bluetooth, LTE-U and other nodes, a Listen Before Talk (LBT) mechanism is introduced when an unlicensed frequency band is used. The efficiency of random access will be affected because LBT cannot determine the time slot of transmission.
Disclosure of Invention
The invention mainly solves the technical problem of providing a random access obtaining device, a user equipment and a device with a storage function, which can improve the efficiency of random access.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a random access method, including: the user equipment sends the request message to the base station; starting a first timer and a second timer to start timing; performing idle channel assessment on a current channel, if the current channel is available, continuing timing by the second timer, if the current channel is unavailable, suspending 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; and if the first timer and/or the second timer reach the preset time threshold and the user equipment does not receive the response message sent by the base station, judging that the random access fails.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a user equipment comprising: a processor coupled to the communication circuitry and the memory, a communication circuit, and a memory having stored therein program instructions, the processor executing the program instructions to implement the method described above via the communication circuit.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided an apparatus having a storage function, wherein data instructions are stored, said data instructions being adapted to be executed to implement a method as described above.
The invention has the beneficial effects that: different from the situation of the prior art, the invention sets two timers for timing after the request message is sent to the base station, adjusts the waiting time of the user equipment based on the communication quality of the current channel, can quickly judge the occurrence of random access failure, reduces the waiting time of the user equipment and further improves the efficiency of random access.
Drawings
Fig. 1 is a schematic flow chart of a random access method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a second embodiment of the random access method provided in the present invention;
fig. 3 is a flowchart of a random access method according to a third embodiment of the present invention;
fig. 4 is a flowchart of a random access method according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a user equipment provided in the present invention;
fig. 6 is a schematic structural diagram of a device with a storage function provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a random access method according to a first embodiment of the present invention, and 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 a process in which the user equipment finds a downlink signal, synchronizes with the base station, decodes broadcast information of the base station, and completes first uplink transmission. In a specific implementation scenario, depending on the licensed frequency band that cannot meet the current communication requirement, the user equipment needs to complete a random access procedure in the NR-based unlicensed frequency band. The user equipment sends a request message to the base station to indicate the presence of the random access request by the base station and to 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 ue needs to be sent to the base station at a selected time with a certain transmission power and transmission format. In this implementation scenario, the transmission format may be determined based on broadcast system information, the transmission power is estimated from downlink path loss in a downlink reference signal or control signal, and the timing of transmission is randomly selected. In this implementation scenario, the request message includes a first message and a third message, the first message includes a set of preamble sequences selected from the contention preambles, and the third message includes at least one of a radio resource control connection request and a scheduling request and a cell radio network temporary identity. The decoding difficulty of the preamble sequence is low, so that the base station can quickly decode after receiving the preamble to acquire the information contained in the preamble.
In other implementation scenarios, the request message may include only the first message or only the third message.
The NR-based unlicensed band access scenario referred to in this implementation scenario includes:
carrier aggregation between a licensed-band NR cell (primary cell) and an unlicensed-band NR cell (secondary cell), which may include both uplink and downlink or only downlink;
dual connectivity between LTE cells (primary cells) of licensed frequency bands and NR cells (secondary cells) of unlicensed frequency bands;
an independent unlicensed band NR cell;
an NR cell having a downlink in an unlicensed band and an uplink in a licensed band;
scenarios such as dual connectivity between an NR cell of a licensed frequency band (primary cell) and an NR cell of an unlicensed frequency band (secondary cell).
In this implementation scenario, both the user equipment and the base station operate in the unlicensed frequency band, and in other implementation scenarios, only one of the user equipment and the base station may operate in the unlicensed frequency band, the other may operate in the licensed frequency band, or both may operate in the licensed frequency band.
S102: and starting a first timer and a 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 a data packet accessed in the unlicensed frequency band based on LTE is up to 10ms, and the frame length of an IEEE802.11a/g/n/ac data packet is close to 6 ms. The first timer duration of the timer in the NR-based unlicensed band access must be set to a time greater than 10 ms. In this implementation scenario, the first timer has a timing duration greater than 10ms, and the second timer has a timing duration less than 1 ms.
S103: and performing 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, suspending timing by the second timer, and keeping the timing state by the first timer regardless of whether the current channel is available or not.
In a specific implementation scenario, the user equipment performs CAA (Clear Channel Assessment) on the current Channel. The principle of clear channel assessment is similar to energy detection, with the objective of estimating whether the target channel is clear. The method for evaluating the idle channel mainly comprises the steps of detecting whether the energy exceeds a set threshold (at least exceeds the sensitivity of a receiver by 10dB), or detecting whether a signal conforming to IEEE802.11, IEEE 802.15.4, Bluetooth or LTE-U exists in the channel, and if the detected energy exceeds the set threshold or meets the standards of IEEE802.11, IEEE 802.15.4, Bluetooth, LTE-U and the like, the channel is considered to be busy, and the channel is not available currently. Since the clear channel assessment method is prior art, it will not be described in detail here to avoid redundancy.
After receiving the request message sent by the user equipment, if the request message is decoded successfully, the base station sends a response message to the user equipment to inform the user equipment that random access connection can be established. If the ue does not receive the response message, the possible reasons include that the base station cannot obtain the channel through LBT, send the response message to the ue, and the base station does not successfully receive the request message. In this implementation scenario, the ue 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 ue when the current channel is available. The second timer is suspended because the response message cannot be transmitted to the user equipment even if the base station successfully receives the request message if the current channel is not available. If the current channel is available, the base station may send a response message to the user equipment, so the second timer continues to count.
Meanwhile, the first timer keeps a timing state regardless of whether the current channel is available. The first timer is used to control the total time the user equipment waits.
S104: and if the timing of the first timer and/or the second timer reaches the preset time threshold, and the user equipment does not receive a response message sent by the base station, judging that the random access fails.
In this implementation scenario, if any one of the first timer and the second timer reaches its preset time threshold, and the ue does not receive the response message sent by the base station, it determines that this random access fails.
If the first timer reaches its preset time threshold, it indicates that the second timer is in a suspended state for a long time, so that it can be inferred that the reasons for the random access failure include: the base station can not acquire available channels to transmit random access response information to the user equipment through LBT; if the second timer reaches its preset time threshold, it indicates that the current channel is in an available state, and therefore, it may be inferred that the reason for the random access failure includes: the transmission power is insufficient, the user equipment collides with other user equipment in a random access frequency band, the user equipment collides with other wireless transmission modes using the same frequency band, and random access response information sent by the base station collides with other terminals.
In this implementation scenario, after the ue determines that the random access fails, the steps S101-S103 are repeatedly executed until the first timer and the second timer count time to reach the preset time threshold, and a response message sent by the base station is received.
In order to improve the efficiency of random access and avoid the situation that the user equipment repeatedly sends the request message to the base station, each time step S101 is executed, the number of times of sending the request message is increased by one, and when the number of times of sending the request message reaches a preset threshold (for example, 5 times, 10 times, etc.), the random access method is stopped.
In this implementation scenario, the response message includes a second message and a fourth message, and the second message includes: at least one of time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier) and uplink allocation resources (e.g., uplink grant). The fourth message includes: a contention resolution scheme.
In other implementation scenarios, the response message may also include only the second message or only the fourth message, and when the request message sent by the user equipment includes only the first message, the response message includes only the second message, and when the request message sent by the user equipment includes only the third message, the response message includes only the fourth message.
As can be seen from the above description, in this embodiment, after the ue sends the request message to the base station, the first timer and the second timer are started, so that the time for the ue to wait for the response message sent by the base station can be flexibly controlled by monitoring the channel communication state, the random access failure can be quickly determined, the waiting time can be effectively shortened, and the random access efficiency can be improved. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
Referring to fig. 2, fig. 2 is a flowchart illustrating a random access method according to a second embodiment of the present invention, and 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: and starting a first timer and a second timer to start timing.
S203: and performing 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, suspending timing by the second timer, and keeping the timing state by the first timer regardless of whether the current channel is available or not.
Steps S201 to S203 are substantially the same as steps S101 to S103 of the first embodiment of the random access method provided by the present invention, and it is equivalent to that the request message in steps S101 to S103 only includes the first message, and the response message only includes the third message, so that details are not repeated here.
S204: and if the first timer and/or the second timer expires when the timing reaches a preset threshold, the user equipment receives a second message sent by the base station, and the first timer and the second timer stop timing.
In a specific implementation scenario, before the first timer and the second timer reach their preset thresholds, the ue receives the second message sent by the base station, which indicates that it may request the base station for unlicensed frequency band access. In order to successfully perform the subsequent random access method, the first timer and the second timer stop counting. In this implementation scenario, the second message includes: at least one of time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier) and uplink allocation resource.
S205: the user equipment transmits a third message to the base station using the uplink allocation resource.
In this implementation scenario, the ue sends a third message to the base station using the uplink allocation resource received in step S204. In this implementation scenario, the third message includes at least one of a radio resource control connection request and a scheduling request and the cell radio network temporary identifier temporarily allocated to the ue received in step S204.
S206: and clearing the first timer and the second timer, and starting the first timer and the second timer to start timing.
In this implementation scenario, in step S204, since the ue receives the response message sent by the base station, the ue suspends the timing of the first timer and the second timer, and then clears the first timer and the second timer to restart the timing. In other implementation scenarios, the first timer and the second timer may be directly cleared in step 204, and the first timer and the second timer may be directly started in this step.
S207: and performing 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, suspending timing by the second timer, and keeping the timing state by the first timer regardless of whether the current channel is available.
Since the communication quality of the random access of the unlicensed frequency band is not very stable, the communication state of the current channel is evaluated again after the third message is sent to the base station. This step is substantially similar to step S203 and will not be described herein again.
S208: and when the first timer and/or the second timer reaches a preset time threshold, if the user equipment does not receive a fourth message sent by the base station, judging that the random access fails.
In this implementation scenario, the base station may receive the second message sent by multiple ues having the same preamble sequence at the same time, and the base station may select one ue from the multiple ues and send a fourth message to the selected ue to notify the selected ue that the ue can perform communication in the unlicensed frequency band. In this implementation scenario, the fourth message includes a contention resolution scheme, for example, an identifier of the selected user equipment or an identifier of a contention resolution method. The user equipment can know that random access communication can be carried out in the unlicensed frequency band according to the competition solution.
In this implementation scenario, when any one of the first timer and the second timer reaches its preset threshold, it may be determined that this random access fails. If the first timer reaches its preset threshold, it indicates that the second timer is in a suspended state for a long time, so that it can be inferred that the reasons for the random access failure include: the base station cannot acquire an available channel to transmit fourth information to the user equipment; if the second timer reaches its preset threshold, it indicates that the current channel is in an available state, so it can be inferred that the reason for the random access failure includes: the transmission power is insufficient, the user equipment collides with other user equipment in a random access frequency band, the user equipment collides with other wireless transmission modes using the same frequency band, and random access response information sent by the base station collides with other terminals.
In this implementation scenario, after the ue determines that the random access fails, the steps S201-S207 are repeatedly executed until the first timer and the second timer count time to reach their preset thresholds, and a fourth message sent by the base station is received.
In order to improve the efficiency of random access and avoid the situation that the ue repeatedly sends the first message to the base station, each time step S201 is executed, 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 a preset threshold (e.g., 5 times, 10 times, etc.), the random access procedure is stopped.
In another implementation scenario, before any one of the first timer and the second timer reaches its preset time threshold, the ue receives a fourth message sent by the base station, and determines that this random access is successful.
As can be seen from the above description, in this embodiment, after the ue sends the first message and the third message to the base station, both the first timer and the second timer are started, where the first timer is used to control the total time for the ue to wait for the response message sent by the base station based on the received message, and the second timer is used to control the time for the ue to wait for the response message in a state with a good channel state, so that the waiting time can be flexibly adjusted, the random access failure can be quickly determined, the waste in the waiting time is reduced, and the random access efficiency is improved. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
Referring to fig. 3, fig. 3 is a flowchart illustrating a random access method according to a third embodiment of the present invention, and 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, depending on the licensed frequency band that cannot meet the current communication requirement, the user equipment needs to complete a random access procedure in the NR-based unlicensed frequency band. The user equipment sends a first message to the base station to indicate the presence of the random access request by the base station and to 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 set of preamble sequences selected from the contention preambles. The transmission format may be determined based on broadcast system information, the transmission power estimated from the downlink path loss in the downlink reference signal or control signal, and the timing of the transmission randomly selected. In this implementation scenario, the first message needs to be sent to the base station at a selected timing with a determined transmission power and transmission format.
S302: and starting a first timer and a second timer to start timing.
In the implementation scenario, the idle channel assessment is performed on the current channel, if the current channel is available, the second timer continues to count time, if the current channel is unavailable, the second timer suspends counting time, and meanwhile, the first timer keeps a counting state no matter whether the current channel is available or not.
In this implementation scenario, the first timer has a timing duration greater than 10ms, and the second timer has a timing duration less than 1 ms.
S303: the base station sends a second message to the user equipment.
In this implementation scenario, the base station sends a second message to the ue based on the preamble sequence detected in a certain timing, where the second message includes: at least one of time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier) and uplink allocation resources (e.g., uplink grant).
And 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 the preset threshold, the first timer and the second timer stop timing.
And if the timing of the first timer and/or the second timer reaches the preset threshold, the user equipment does not receive a second message sent by the base station, and then the random access is judged to fail. In this implementation scenario, after the ue determines that the random access fails, steps S301 to S302 are repeatedly executed until the first timer and the second timer count time to reach the preset time threshold, and a second message sent by the base station is received.
S304: the user equipment sends a third message to the base station.
In this implementation scenario, the ue sends a third message to the base station using the uplink allocation resource. The third message includes at least one of a radio resource control connection request and a scheduling request and a cell radio network temporary identity temporarily allocated to the user equipment in the received second message.
S305: and clearing the first timer and the second timer, and starting the first timer and the second timer to start timing.
In this implementation scenario, the first timer and the second timer are cleared, and the first timer and the second timer are started to start timing. And performing 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 the timing by the second timer, and keeping the timing state of the first timer no matter whether the current channel is available or not.
In this implementation scenario, the first timer has a timing duration greater than 10ms, and the second timer has a timing duration less than 1 ms.
S306: the base station transmits a fourth message to the user equipment.
In this implementation scenario, the base station may receive a third message sent by multiple ues having the same preamble sequence at the same time, and the base station may select one ue from the multiple ues and send a fourth message to the selected ue to notify the selected ue that the ue can perform communication in the unlicensed frequency band. In this implementation scenario, the fourth message includes a contention resolution scheme, for example, an identifier of the selected user equipment or an identifier of a contention resolution method. The user equipment can know that random access communication can be carried out in the unlicensed frequency band according to the competition solution.
And if the user equipment receives a 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.
And if the user equipment does not receive the fourth message sent by the base station when the timing of the first timer and/or the second timer reaches the preset time threshold, judging that the random access fails. In this implementation scenario, after the ue determines that the random access fails, steps S301 to S305 are repeatedly executed until the first timer and the second timer reach a preset time threshold, and a fourth message sent by the base station is received.
As can be seen from the above description, in this implementation, when establishing random access based on an unlicensed frequency band, after sending a first message and a second message to a base station, a first timer and a second timer are started to start timing, where the first timer is used to control a total waiting time for a user equipment to wait for a response message from the base station, and the second timer is used to control a waiting time for the user equipment to wait for the response message from the base station when a channel communication state is good. Therefore, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be rapidly judged, and the unnecessary waiting time is solved, so that the random access efficiency is improved. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
Referring to fig. 4, fig. 4 is a flowchart illustrating a random access method according to a third embodiment of the present invention, and as shown in fig. 4, the random access method of the present invention includes:
s401: the user equipment simultaneously transmits the first message and the third message to the base station.
In a specific implementation scenario, only depending on the licensed frequency band, which cannot meet the current communication requirement, the user equipment needs to complete a random access procedure in the NR-based unlicensed frequency band. The user equipment sends a first message to the base station to indicate the presence of the random access request by the base station and to 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 set of preamble sequences selected from the contention preambles. The transmission format may be determined based on broadcast system information, the transmission power estimated from the downlink path loss in the downlink reference signal or control signal, and the timing of the transmission randomly selected. In this implementation scenario, the first message needs to be sent to the base station at a selected timing with a determined transmission power and transmission format. The third message includes at least one of a radio resource control connection request and a scheduling request and a cell radio network temporary identity temporarily allocated to the user equipment.
S402: and starting a first timer and a second timer to start timing.
In the implementation scenario, the idle channel assessment is performed on the current channel, if the current channel is available, the second timer continues to count time, if the current channel is unavailable, the second timer suspends counting time, and meanwhile, the first timer keeps a counting state no matter whether the current channel is available or not.
In this implementation scenario, the first timer has a timing duration greater than 10ms, and the second timer has a timing duration less than 1 ms.
S403: and the base station simultaneously transmits the second message and the fourth message to the user equipment.
In this implementation scenario, the base station sends a second message to the ue based on the preamble sequence detected in a certain timing, where the second message includes: at least one of time adjustment information, C-RNTI (Cell Radio Network Temporary Identifier) and uplink allocation resources (e.g., uplink grant). The fourth message comprises a contention resolution scheme, e.g. an identification of the selected user equipment or an identification of a contention resolution method, etc. The user equipment can know that random access communication can be carried out in the unlicensed frequency band according to the competition solution.
And 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.
And if the first timer and/or the second timer reaches the preset time threshold, the user equipment does not receive the second message and the fourth message sent by the base station, and then the random access is judged to fail. In this implementation scenario, after the ue determines that the random access fails, steps S401 to S402 are repeatedly executed until the first timer and the second timer count time to reach their preset time thresholds, and the second message and the fourth message sent by the base station are received.
As can be seen from the above description, in this implementation, when establishing random access based on an unlicensed frequency band, after sending a first message and a third message to a base station, a first timer and a second timer are started to start timing, where the first timer is used to control a total waiting time for a user equipment to wait for a response message from the base station, and the second timer is used to control a waiting time for the user equipment to wait for a corresponding response message from the base station when a channel communication state is good. Therefore, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be rapidly judged, and the unnecessary waiting time is solved, so that the random access efficiency is improved. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a ue according to an embodiment of the present invention. The user equipment 10 comprises a processor 11, a memory 12 and a communication circuit 13 coupled to each other, the memory 12 is used for storing program data, the processor 11 is used for operating the program data in the memory 12 to control the communication circuit 13 to communicate and execute the following random access method:
the processor 11 of the user equipment 10 sends a request message to the base station via the communication circuit 13. The processor 11 starts the first timer and the second timer to start timing. The processor 11 performs idle channel assessment 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, if the current channel is not available, the processor 11 controls the second timer to pause timing, and meanwhile, the processor 11 controls the first timer to keep a timing state whether the current channel is available or not. If the first timer and/or the second timer reaches the preset time threshold, and the ue 10 does not receive the response message sent by the base station through the communication circuit 13, the processor 11 determines that the random access is failed.
Before any one of the first timer and the second timer reaches the preset time threshold, the user equipment 10 receives a response message sent by the base station through the communication circuit 13, and then determines that the random access is successful.
The specific process of the processor 11 for implementing the above functions may refer to the above method embodiments.
As can be seen from the above description, the ue in this embodiment may start a first timer and a second timer to start timing when sending the request message to the base station, where the first timer is used to control the total waiting time for the ue to wait for the response message from the base station, and the second timer is used to control the waiting time for the ue to wait for the corresponding response message from the base station when the channel communication status is good. Therefore, the waiting time of the user equipment can be flexibly adjusted, the random access failure can be rapidly judged, and the unnecessary waiting time is solved, so that the random access efficiency is improved. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a device with a storage function according to the present invention. The device 20 with memory function stores at least one program instruction 21, and the program instruction 21 is used for executing the method of random access as shown in fig. 1-4. In one embodiment, the apparatus with storage function may be a storage chip in a terminal, a hard disk, or a removable hard disk or other readable and writable storage tool such as a flash disk, an optical disk, or the like, and may also be a server or the like.
As can be seen from the above description, the program or the instruction stored in the embodiment of the apparatus with storage function in this embodiment may be used to flexibly adjust the waiting time of the ue, so as to quickly determine the random access failure and solve the unnecessary waiting time, thereby improving the efficiency of the random access. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
The invention is characterized in that after the user equipment sends a request message to the base station, a first timer and a second timer are started, wherein the first timer is used for controlling the total time of the user equipment for waiting for the corresponding response message sent by the base station based on the received message, and the second timer is used for controlling the time of the user equipment for waiting for the corresponding response message in a good channel state. And the reason of the random access failure can be roughly judged according to whether the first timer reaches the preset time threshold or the second timer reaches the preset time threshold.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (15)
1. A random access method, comprising:
the user equipment sends the request message to the base station;
starting a first timer and a second timer to start timing;
performing idle channel assessment on a current channel, if the current channel is available, continuing timing by the second timer, if the current channel is unavailable, suspending 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, and the user equipment does not receive a response message sent by the base station, determining that the random access is failed;
after the random access is judged to fail, the method further comprises the following steps:
repeatedly executing the steps of sending the request message to the base station and the subsequent steps;
wherein the method further comprises:
and adding one to the number of times of sending the request message every time the step of sending the request message to the base station is executed, and stopping the random access process when the number of times of sending the request message reaches a preset threshold value.
2. The method of claim 1,
the request message includes: a first message, the first message comprising: a preamble sequence;
the sending the request message to the base station includes:
and sending the first message to a base station at a selected opportunity by using the determined transmission power and transmission format.
3. The method of claim 2,
the preamble sequence is a set of preamble sequences selected from contention preambles.
4. The method of claim 2,
the transmission format is determined based on broadcasted system information.
5. The method of claim 2,
the transmission power is estimated from a downlink path loss in a downlink reference signal or a control signal.
6. The method of claim 2,
the timing is a randomly selected timing.
7. The method of claim 1,
the response message includes: a second message, the second message comprising: at least one of time adjustment information, cell radio network temporary identities and uplink allocation resources.
8. The method of claim 1,
the request message includes: a third message, the third message comprising: at least one of a radio resource control connection request and a plan request, and a cell radio network temporary identifier;
before sending the request message to the base station, the method includes:
receiving a second message sent by the base station;
the sending the request message to the base station includes:
and responding to the second message, and sending the third message to the base station.
9. The method of claim 1,
the response message includes: a fourth message, the fourth message comprising: a contention resolution scheme.
10. The method of claim 1,
the request message includes: a first message and a third message;
the sending the request message to the base station includes:
and sending the first message and the third message to the base station.
11. The method of claim 10,
the response message includes: a second message and a fourth message.
12. The method of claim 1, further comprising:
and if the user equipment receives a response message sent by the base station before the timing of the first timer and/or the second timer reaches the preset time threshold, judging that the random access is successful.
13. The method according to any of claims 1-12, wherein said user equipment and said base station operate in unlicensed frequency bands.
14. A user device, comprising: a processor coupled to the communication circuitry and the memory, a communication circuit, and a memory having stored therein program instructions, the processor executing the program instructions to implement the method of any of claims 1-13 via the communication circuit.
15. An apparatus having storage functionality, wherein data instructions are stored, the data instructions being for execution to implement the method of any one of claims 1-13.
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| CN105873229A (en) * | 2015-02-06 | 2016-08-17 | 宏达国际电子股份有限公司 | Communication Device and Wireless Communication System for Handling Random Access Procedure |
| CN106465430A (en) * | 2014-06-13 | 2017-02-22 | 高通股份有限公司 | Wireless communications over unlicensed radio frequency spectrum |
| CN106455106A (en) * | 2016-12-05 | 2017-02-22 | 西北工业大学 | Dominant right switchable random access method based on channel condition sensing |
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| US20120182893A1 (en) * | 2011-01-17 | 2012-07-19 | Solomon Trainin | Method, apparatus and system for controlling power of wireless communication device |
| US9961718B2 (en) * | 2015-03-27 | 2018-05-01 | Qualcomm Incorporated | Discontinuous reception in LTE/LTE-A networks including contention-based frequency spectrum |
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| CN104718780A (en) * | 2012-10-15 | 2015-06-17 | Lg电子株式会社 | Method and apparatus for active scanning in wireless LAN |
| CN106465430A (en) * | 2014-06-13 | 2017-02-22 | 高通股份有限公司 | Wireless communications over unlicensed radio frequency spectrum |
| CN105873229A (en) * | 2015-02-06 | 2016-08-17 | 宏达国际电子股份有限公司 | Communication Device and Wireless Communication System for Handling Random Access Procedure |
| CN108024310A (en) * | 2016-11-04 | 2018-05-11 | 华为技术有限公司 | It is used for transmission method, terminal device and the network equipment of data |
| CN106455106A (en) * | 2016-12-05 | 2017-02-22 | 西北工业大学 | Dominant right switchable random access method based on channel condition sensing |
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