CN109756990B - Random access method and mobile communication terminal - Google Patents
Random access method and mobile communication terminal Download PDFInfo
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- CN109756990B CN109756990B CN201711077433.7A CN201711077433A CN109756990B CN 109756990 B CN109756990 B CN 109756990B CN 201711077433 A CN201711077433 A CN 201711077433A CN 109756990 B CN109756990 B CN 109756990B
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Abstract
An object of an embodiment of the present invention is to provide a random access method and a mobile communication terminal, where the method includes: sending a message MSG3 to a distributed unit DU of the network side equipment, and activating a first timer; restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out; and stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful. The invention can shorten the time that the mobile communication terminal which fails to compete restarts the random access process without receiving the conflict resolution message before the first timer is overtime, and improve the efficiency of the mobile communication terminal which fails to compete to complete the random access process.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a random access method and a mobile communication terminal.
Background
Currently, 3GPP (The 3rd Generation Partnership Project) RAN (Radio Access Network) 3 standardization group has determined that in a 5G (5 th-Generation) system, a Radio Network Access device (hereinafter, a base station is taken as an example) can be split into separate architectures of a CU (central Unit) and a DU (Distributed Unit) according to a protocol stack, and an entire protocol stack used by The base station in an LTE (Long Term Evolution) system is originally split into two parts. In addition, the 3GPP RAN3 specifies that when the segmentation is located at a higher layer, a PDCP (Packet Data Convergence Protocol) layer and an RRC (Radio Resource Control) layer are to be located at a CU, and an RLC (Radio Link Control) layer, an MAC (Medium Access Control) layer, and a PHY (Physical layer) layer are to be located in a DU.
Therefore, compared with the base station in the LTE system, after the base station in the 5G system receives, through the DU, the connection request message sent when the mobile communication terminal (hereinafter, referred to as UE) initiates the random access procedure and sends the contention result to the UE, the base station needs to perform RRC signaling interaction with the CU, forward the connection request message sent by the UE that has succeeded in contention to the CU, and the CU determines whether to receive the UE access, and sends the decision result of the CU to the UE through the DU, so that the waiting time from the sending of the connection request message to the receiving of the decision result by the UE is long.
For the LTE system, currently, the UE sets a timer considering air interface delay and MSG3 processing time, and restarts the random access procedure when the UE does not receive a decision result sent by the base station to indicate whether to grant access before the timer expires. Therefore, when the existing UE initiates the random access procedure to the radio network access device in the 5G system, since RRC signaling interaction is also required between the DU and the CU in the radio network access device in the 5G system, the UE that has failed in contention may wait for a long time to obtain the result of the failure in contention, which is not favorable for the UE that has failed in contention to quickly complete the random access procedure.
Disclosure of Invention
The embodiment of the invention aims to provide a random access method and a mobile communication terminal, so as to shorten the time for restarting a random access process of the mobile communication terminal which fails to compete and improve the efficiency of the mobile communication terminal which fails to compete in completing the random access process.
In order to achieve the above object, an embodiment of the present invention provides a random access method for a mobile communication terminal, where the random access method includes:
sending a message MSG3 to a distributed unit DU of the network side equipment, and activating a first timer;
restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out;
stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
An embodiment of the present invention further provides a mobile communication terminal, including: a transceiver for sending a message MSG3 to a distributed unit DU of a network side device;
a processor, configured to activate a first timer after the transceiver sends a message MSG3 to a distributed unit DU of a network side device;
restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out;
stopping the first timer and almost a second timer when the conflict resolution message is received before the first timer times out and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
An embodiment of the present invention further provides a mobile communication terminal, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the random access method is implemented.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the random access method as described above.
In the embodiment of the present invention, the mobile communication terminal is provided with a first timer for controlling the waiting time for resolving the collision message and a second timer for controlling the waiting time of the MSG 4. The mobile communication terminal sends a message MSG3 to a distributed unit DU of the network side equipment and activates a first timer; restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out; and stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful. Compared with the prior art that only a timer for controlling the waiting time of the MSG4 is arranged, the mobile communication terminal can restart the random access process based on the competition when the first timer does not receive the conflict resolution message before overtime, and does not need to restart the random access process based on the competition when the second timer is overtime and does not receive the MSG4, so that the time that the conflict resolution message is not received before the first timer is overtime can be shortened, namely the time that the mobile communication terminal failed in the competition restarts the random access process can be shortened, and the efficiency of the mobile communication terminal failed in the competition to finish the random access process can be improved.
Drawings
Fig. 1 shows one of the flow charts of the random access method provided by the embodiment of the present invention;
fig. 2A shows a second flowchart of a random access method according to an embodiment of the present invention;
fig. 2B is a third flowchart of a random access method according to an embodiment of the present invention;
fig. 2Ba shows a fourth flowchart of the random access method according to the embodiment of the invention;
fig. 2Bb shows a fifth flowchart of the random access method according to the embodiment of the present invention;
fig. 2Bc shows a sixth flowchart of the random access method according to the embodiment of the present invention;
fig. 2C shows a seventh flowchart of a random access method according to an embodiment of the present invention;
fig. 2D shows an eighth flowchart of a random access method according to an embodiment of the present invention;
fig. 3 is a block diagram of a mobile communication terminal according to an embodiment of the present invention;
fig. 4 is a block diagram of a mobile communication terminal according to still another embodiment of 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 some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, the mobile communication terminal is a mobile communication terminal which is not accessed to the network side, and the mobile communication terminal can communicate with the network side equipment of the CU-DU framework separated from the high layer through the network after the random access is finished.
In the random access process of the network side equipment with the CU-DU architecture with the separated upper layers, after receiving, through the DU, MSG3(Message 3) carrying a connection request sent by the mobile communication terminal, the network side equipment replies a conflict resolution Message or a NACK (Negative Acknowledgement) Message indicating a competition result to the mobile communication terminal, and forwards, to the CU, MSG3 of the mobile communication terminal that has succeeded in the competition, and the CU decides whether to accept the connection request of the mobile communication terminal or not by the CU of the network side equipment, and then sends a decision result to the mobile communication terminal through the DU. The decision result may be carried in MSG4(Message 4 ).
Therefore, compared with the prior art in which only one timer for controlling the waiting time of the MSG4 is provided in the mobile communication terminal, the mobile communication terminal in the embodiment of the present invention is additionally provided with one timer for controlling the waiting time for resolving the collision message, that is, the mobile communication terminal in the embodiment of the present invention is simultaneously provided with the timer for controlling the waiting time for resolving the collision message, which is recorded as the first timer, and the timer for controlling the waiting time of the MSG4, which is recorded as the second timer. Therefore, the mobile communication terminal of the embodiment of the invention can be used for solving the problem that the competition fails, such as: when the conflict resolving message is not received before the timer is overtime, or the conflict resolving message or NACK message for indicating the competition failure is received before the timer is overtime, the random access process based on the competition is restarted or other operations are executed, and the random access process based on the competition is restarted without waiting until the timer for indicating the waiting time of the MSG4 is overtime and the MSG4 is not accepted, so that the time for the mobile communication terminal failed in the competition to restart the random access process can be shortened, and the efficiency of the mobile communication terminal failed in the competition to complete the random access process is improved.
The Mobile communication terminal according to the embodiment of the present invention may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like. The network side device is a network side device of a CU-DU architecture with a separated higher layer, and may be a base station (abbreviated to gNB) in a 5G network, and the like, which is not limited herein.
A random access method applied to a mobile communication terminal according to an embodiment of the present invention will be described below.
Referring to fig. 1, fig. 1 shows a flowchart of a random access method according to an embodiment of the present invention. As shown in fig. 1, the random access method of the present embodiment includes the following steps:
102, restarting a random access process based on competition when the conflict resolving message is not received before the first timer is overtime;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
It should be noted that "before the timer times out" described in the embodiments of the present invention means the entire time period from when the timer is activated to when the timer times out. Taking step 102 and step 103 as an example to describe separately, step 102 shows that if the mobile communication terminal has not received the conflict resolution message all the time within the whole time period between the activation of the first timer and the timeout, the contention-based random access procedure is restarted; step 103 represents stopping the first timer and activating the second timer if the mobile communication terminal receives the conflict resolution message at any time point in the whole time period from the activation of the first timer to the timeout, and the conflict resolution message indicates the success of the competition.
In this embodiment, step 102 and step 103 are two parallel implementations that can be performed by the mobile communication terminal based on the determination result of whether the first timer has received the conflict resolution message before timeout. For convenience of description, step 101 and step 102 will be referred to as a first embodiment, and step 101 and step 103 will be referred to as a second embodiment.
For the first embodiment, please refer to fig. 2A. As shown in fig. 2A, the present embodiment includes the steps of:
In this embodiment, the mobile communication terminal sends a Random Access Preamble (Random Access Preamble) to the DU to initiate contention-based Random Access to the network side device, where the Random Access Preamble may be carried in a Message 1(Message 1, MSG1 for short).
Because the Network side device may receive the contention-based Random Access flows initiated by multiple mobile communication terminals at the same time, at this time, the Network side device cannot know the corresponding relationship between multiple Random Access requests and each mobile communication terminal initiating the Random Access flow, the DU needs to allocate a Cell-Radio Network Temporary Identifier (C-RNTI), and carries the unique Temp C-RNTI in a Random Access Response (RAR) to send to the mobile communication terminal, and in addition, the RAR may also carry an UL Grant (uplink scheduling Grant).
In this way, the mobile communication terminal can transmit the MSG3 associated with itself to the DU based on the temporary C-RNTI, and the DU can know which mobile communication terminal the MSG3 is transmitted from after receiving the MSG 3. The mobile communication terminal activates a first timer for controlling a waiting time for resolving the collision message after transmitting the MSG3 to the DU.
In this embodiment, the mobile communication terminal does not receive the conflict resolution message before the first timer times out, which indicates that the mobile communication terminal of this embodiment is the mobile communication terminal that has failed in the contention based random access process, and the mobile communication terminal restarts the contention based random access process. Thus, compared with the prior art, the time for restarting the random access process based on competition of the mobile communication terminal can be shortened.
For the second embodiment, please refer to fig. 2B. As shown in fig. 2B, the present embodiment includes the steps of:
And step 208, the mobile communication terminal receives the conflict resolution message before the first timer is overtime, and stops the first timer and activates a second timer when the conflict resolution message indicates that the competition is successful.
Different from the first embodiment, if the present embodiment receives the conflict resolution message indicating successful contention before the first timer expires, which means that the mobile communication terminal of the present embodiment is the mobile communication terminal successfully contending in the contention based random access process, the mobile communication terminal may stop the first timer, activate the second timer, and wait for the DU to send the MSG 4.
For this embodiment, although the mobile communication terminal in this embodiment is a mobile communication terminal that successfully competes in the contention-based random access process, the mobile communication terminal needs to activate the second timer, and can determine whether the network-side device accepts the decision result of the random access request only after receiving and analyzing the MSG4 before the second timer expires.
Therefore, after activating the second timer, the mobile communication terminal also needs to perform different operations according to the type or content of the message received before the second timer, please refer to fig. 2Ba to fig. 2Bc together.
As shown in fig. 2Ba, this embodiment includes the following steps:
And step 208, the mobile communication terminal receives the conflict resolution message before the first timer is overtime, and stops the first timer and activates a second timer when the conflict resolution message indicates that the competition is successful.
In step 210, the CU sends a downlink radio resource control message to the DU.
In this embodiment, after determining that the mobile communication terminal successfully competes, the DU forwards an Initial uplink radio resource control Message (Initial UL RRC Message) to the CU, where the Initial UL RRC Message carries the C-RNTI and the MSG 3. The CU decides whether to accept the random access request of the mobile communication terminal, and carries a decision result in a downlink radio resource control (DL RRC Message), wherein the DL RRC Message also carries identity information (UE ID) and C-RNTI (radio network temporary identity) of the mobile communication terminal in order to make the DU clear which mobile communication terminal is accepted or rejected by the CU. In this embodiment, the decision result carried in the downlink rrc message is that the CU receives the random access request from the mobile communication terminal.
Thus, the DU may send MSG4 to the corresponding mobile communication terminal to inform the mobile communication terminal whether the network side device grants its access.
In this embodiment, the mobile communication terminal receives and successfully decodes the MSG4 before the second timer times out, and stops the second timer when it is known that the network side device accepts its random access request.
As shown in fig. 2Ba, if the MSG4 indicates that the network side device accepts the random access request of the mobile communication terminal, after the mobile communication terminal completes the random access, the mobile communication terminal sends a random access completion feedback message to the DU, so that the DU sends a random access completion feedback message to the CU.
It should be understood that, in another embodiment, if the MSG4 instructs the network-side device to reject the random access request of the mobile communication terminal, the mobile communication terminal may decide whether to reinitiate the random access request after stopping the second timer, which is not limited in this embodiment of the present invention.
As shown in fig. 2Bb, this embodiment includes:
And step 208, the mobile communication terminal receives the conflict resolution message before the first timer is overtime, and stops the first timer and activates a second timer when the conflict resolution message indicates that the competition is successful.
In step 210, the CU sends a downlink radio resource control message to the DU.
In step 214, the mobile communication terminal transmits a second NACK message to the DU.
Unlike the embodiment corresponding to fig. 2Ba, the mobile communication terminal according to the present embodiment receives the MSG4 before the timeout of the second timer, but fails to decode the MSG4, and therefore, the mobile communication terminal transmits the second NACK message to the DU so that the DU retransmits the initial uplink radio resource control message to the CU, and retransmits the MSG4 to the mobile communication terminal when receiving the downlink radio resource control message. This is repeated until the mobile communication terminal receives and successfully decodes the MSG4 before the second timer expires, stopping the second timer. As shown in fig. 2Bb, if the MSG4 indicates that the network side device accepts the random access request of the mobile communication terminal, after the mobile communication terminal completes the random access, the mobile communication terminal sends a random access completion feedback message to the DU, so that the DU sends the random access completion feedback message to the CU. It should be understood that, in another embodiment, if the MSG4 instructs the network-side device to reject the random access request of the mobile communication terminal, the mobile communication terminal may decide whether to reinitiate the random access request after stopping the second timer, which is not limited in this embodiment of the present invention.
As shown in fig. 2Bc, this embodiment includes:
And step 208, the mobile communication terminal receives the conflict resolution message before the first timer is overtime, and stops the first timer and activates a second timer when the conflict resolution message indicates that the competition is successful.
In step 210, the CU sends a downlink radio resource control message to the DU.
Unlike the embodiment corresponding to fig. 2Ba, the mobile communication terminal of this embodiment does not receive the MSG4 before the second timer expires, which indicates that the random access request of the network mobile communication terminal fails, and therefore, the mobile communication terminal can restart the contention based random access procedure.
In another embodiment, the random access method of the mobile communication terminal further includes a third embodiment, please refer to fig. 2C. As shown in fig. 2C, the present embodiment includes the steps of:
In step 223, the DU transmits a conflict resolution message indicating a contention failure to the mobile communication terminal.
The present embodiment is different from the second embodiment in that although the mobile communication terminal receives the conflict resolution message before the first timer expires, the conflict resolution message indicates that the contention fails, which means that the mobile communication terminal of the present embodiment restarts the contention based random access procedure for the mobile communication terminal that has failed in the contention based random access procedure. Thus, compared with the prior art, the time for restarting the random access process based on competition of the mobile communication terminal can be shortened.
In another embodiment, the random access method of the mobile communication terminal further includes a fourth implementation manner, please refer to fig. 2D together. As shown in fig. 2D, the present embodiment includes the steps of:
Unlike the first embodiment, the first negative acknowledgement NACK message to the MSG3 is received before the timeout of the first timer in the present embodiment. Considering that the MSG3 supports an HARQ (Hybrid Automatic Repeat reQuest) process, i.e. is protected by the HARQ mechanism, the mobile communication terminal may reset the first timer and then return to step 204, so as to further shorten the time for the mobile communication terminal to complete the random access compared to the case that the mobile communication terminal restarts the contention based random access procedure in the first and third embodiments.
It should be noted that, considering that a plurality of mobile communication terminals that have failed in contention may restart the contention-based stacked access procedure at the same time, the contention is congested again, and the probability of the mobile communication terminal failing in contention is high.
Therefore, in the above embodiment, if the mobile communication terminal needs to restart the contention-based random access procedure, the mobile communication terminal may restart the contention-based random access procedure through the backoff time information carried in the system broadcast message, but not limited thereto.
For the first embodiment, since the mobile communication terminal does not receive the conflict resolution message before the timeout of the first timer, the mobile communication terminal of this embodiment may restart the contention-based random access procedure according to the backoff time information carried in the system broadcast message. For the third embodiment, the mobile communication terminal receives the conflict resolution message before the first timer expires, but the conflict resolution message indicates that the contention fails, so the mobile communication terminal of this embodiment may restart the contention based random access procedure according to the backoff time information carried in the system broadcast message or the conflict resolution message.
Specifically, if the backoff time information carried in the system broadcast message or the conflict resolution message indicates that the backoff time is 0, the mobile communication terminal may immediately restart the contention-based random access procedure; if the backoff time information carried in the system broadcast message or the conflict resolution message indicates that the backoff time is T, the mobile communication terminal backs, i.e. after waiting for the time T, the contention-based random access procedure is restarted. Of course, the system broadcast message or the conflict resolution message sent by the network side device may also set different waiting times T for each/group of mobile communication terminals, so that it may be effectively avoided that too many mobile communication terminals restart the contention-based stacked access procedure at the same time, and the contention success probability of the mobile communication terminals is improved.
In addition, if the system broadcast message and the conflict resolution message do not carry the backoff time information, the mobile communication terminal can immediately restart the current contention-based random access procedure.
It should be noted that, in this embodiment, the MSG3 is: a radio resource control Connection establishment Request (RRC Connection Setup Request) message, a radio resource control Connection reestablishment Request (RRC Connection Re-establishment Request) message, or a radio resource control Connection Resume Request (RRC Connection Resume Request) message. Correspondingly, when the network side device accepts the random access request of the mobile communication terminal, the MSG4 is: a radio resource control Connection Setup (RRC Connection Setup) message, a radio resource control Connection Re-establishment (RRC Connection Re-establishment) message, or a radio resource control Connection Resume (RRC Connection Resume) message; when the network side device rejects the random access request of the mobile communication terminal, the MSG4 is: a radio resource control Connection Setup Reject (RRC Connection Setup Reject) message, a radio resource control Connection Re-establishment Reject (RRC Connection Re-establishment Reject) message, or a radio resource control Connection Resume Reject (RRC Connection Resume Reject) message. Specifically, if the MSG3 is an rrc connection setup request message, the MSG4 is an rrc connection setup message or an rrc connection setup reject message; if the MSG3 is an rrc connection reestablishment request message, the MSG4 is an rrc connection reestablishment message or an rrc connection reestablishment reject message; if the MSG3 is an rrc connection resumption request message, the MSG4 is an rrc connection resumption message or an rrc connection resumption rejection message.
In the embodiment of the present invention, the mobile communication terminal is provided with a first timer for controlling the waiting time for resolving the collision message and a second timer for controlling the waiting time of the MSG 4. The mobile communication terminal sends a message MSG3 to a distributed unit DU of the network side equipment and activates a first timer; restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out; and stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful. Compared with the prior art that only a timer for controlling the waiting time of the MSG4 is arranged, the mobile communication terminal can restart the random access process based on the competition when the first timer does not receive the conflict resolution message before overtime, and does not need to restart the random access process based on the competition when the second timer is overtime and does not receive the MSG4, so that the time that the conflict resolution message is not received before the first timer is overtime can be shortened, namely the time that the mobile communication terminal failed in the competition restarts the random access process can be shortened, and the efficiency of the mobile communication terminal failed in the competition to finish the random access process can be improved.
The present invention also provides a mobile communication terminal, as shown in fig. 3, the mobile communication terminal 300 includes:
a transceiver 301, configured to send a message MSG3 to a distribution unit DU of a network-side device;
a processor 302, configured to activate a first timer after the transceiver 301 sends the message MSG3 to the distributed unit DU of the network-side device;
restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out;
stopping the first timer and almost a second timer when the conflict resolution message is received before the first timer times out and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 3.
Optionally, the processor 302 is further configured to restart the contention-based random access procedure when the conflict resolution message is received before the first timer expires and the conflict resolution message indicates that contention fails.
Optionally, the processor 302 is further configured to restart a contention-based random access procedure according to backoff time information carried in a system broadcast message when the conflict resolution message is not received before the timeout of the first timer;
and/or
And when the conflict resolving message is received before the first timer is overtime and indicates that the competition fails, restarting the current competition-based random access process according to the backoff time information carried in the conflict resolving message or the system broadcast message.
Optionally, the processor 302 is further configured to reset the first timer when a first negative acknowledgement, NACK, message is received for the MSG3 before the first timer;
the transceiver 301 is further configured to resend the MSG3 to the DU after the processor resets the first timer.
Optionally, the processor 302 is further configured to stop the second timer when the MSG3 is received and successfully decoded before the second timer expires;
sending a second NACK message to the DU and resetting the second timer when the receiving unit did not successfully decode the MSG3 before the second timer times out;
restarting a contention-based random access procedure when the MSG3 is not received before the second timer times out.
Optionally, if the MSG3 is an rrc connection setup request message, the MSG4 is an rrc connection setup message or an rrc connection setup reject message;
if the MSG3 is an rrc connection reestablishment request message, the MSG4 is an rrc connection reestablishment message or an rrc connection reestablishment reject message;
if the MSG3 is an rrc connection resumption request message, the MSG4 is an rrc connection resumption message or an rrc connection resumption rejection message.
It should be noted that, in this embodiment, the mobile communication terminal 300 may be a mobile communication terminal according to any implementation manner in the method embodiment of the present invention, and any implementation manner of the mobile communication terminal in the method embodiment of the present invention may be implemented by the mobile communication terminal 300 in this embodiment, so as to achieve the same beneficial effects, and details are not described here.
The present invention also provides a mobile communication terminal, as shown in fig. 4, the mobile communication terminal 400 includes: memory 401, processor 402 and computer program 4011 stored on memory 401 and executable on processor 402, the computer program 4011 realizing the following steps when executed by processor 402:
sending a message MSG3 to a distributed unit DU of the network side equipment, and activating a first timer;
restarting a contention-based random access process when a conflict resolution message is not received before the first timer times out;
stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
Optionally, the computer program 4011 further realizes the following steps when being executed by the processor 402:
and restarting a contention-based random access process when the conflict resolution message is received before the first timer is overtime and indicates that contention fails.
Optionally, the computer program 4011 further realizes the following steps when being executed by the processor 402:
restarting a contention-based random access process according to backoff time information carried in a system broadcast message when a conflict resolution message is not received before the first timer times out;
and/or
And when the conflict resolving message is received before the first timer is overtime and indicates that the competition fails, restarting the current competition-based random access process according to the backoff time information carried in the conflict resolving message or the system broadcast message.
Optionally, the computer program 4011 further realizes the following steps when being executed by the processor 402:
when a first Negative Acknowledgement (NACK) message aiming at the MSG3 is received before the first timer is overtime, the first timer is reset, and then the steps of returning to the Distributed Unit (DU) of the network side equipment to send the MSG3 and activating the first timer are carried out.
Optionally, the computer program 4011 further realizes the following steps when being executed by the processor 402:
stopping the second timer upon receiving and successfully decoding the MSG4 before the second timer times out;
sending a second NACK message to the DU and resetting the second timer when the MSG4 is received but not successfully decoded before the second timer times out;
restarting a contention-based random access procedure when the MSG4 is not received before the second timer times out.
Optionally, if the MSG3 is an rrc connection setup request message, the MSG4 is an rrc connection setup message or an rrc connection setup reject message;
if the MSG3 is an rrc connection reestablishment request message, the MSG4 is an rrc connection reestablishment message or an rrc connection reestablishment reject message;
if the MSG3 is an rrc connection resumption request message, the MSG4 is an rrc connection resumption message or an rrc connection resumption rejection message.
It should be noted that, in this embodiment, the mobile communication terminal may be a mobile communication terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the mobile communication terminal in the method embodiment of the present invention may be implemented by the mobile communication terminal in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.
On the other hand, the network side device in the prior art only sends three types of information, which are used for indicating that the mobile communication terminal successfully competes but the random access request is rejected, successfully competes but the mobile access request is accepted or the competition fails, to the mobile communication terminal that initiated the random access request. For a mobile communication terminal that fails in contention or succeeds in contention but rejects a random access request, that is, the random access fails, a contention-based accumulation access procedure may be restarted at the same time, which causes a congestion problem in contention again, resulting in a higher probability of contention failure of the mobile communication terminal.
Therefore, an embodiment of the present invention further provides a random access method, which is applied to a network device, and includes:
and transmitting the back-off time information to the mobile communication terminal with the random access failure. Further, the back-off time information may be carried in a system broadcast message. For the network side device of the whole architecture, the rollback time information may also be carried in MSG 4; for the network side device with the separate architecture, the rollback time information may be carried in the conflict resolution message, which is not limited in the embodiment of the present invention.
Specifically, if the backoff time information indicates that the backoff time is 0, the mobile communication terminal may immediately restart the contention-based random access procedure; if the backoff time information indicates that the backoff time is T, the mobile communication terminal backs, i.e., restarts the contention-based random access procedure after waiting for the time T. Of course, the network side device may also set different waiting times T for each/group of mobile communication terminals, so that it may be effectively avoided that too many mobile communication terminals restart the contention-based stacked access procedure at the same time, and the contention success probability of the mobile communication terminals is improved.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the foregoing embodiment of the random access method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A random access method for a mobile communication terminal, comprising:
based on temporary C-RNTI, sending message MSG3 to distributed unit DU of network side equipment, and activating a first timer for controlling waiting time for solving conflict message, wherein DU allocates cell radio network identifier C-RNTI for mobile communication terminal, and carries unique temporary C-RNTI in random access response RAR to send to mobile communication terminal, RAR also carries uplink scheduling authorization UL Grant;
restarting a contention-based random access process according to backoff time information carried in a system broadcast message when a conflict resolution message is not received before the first timer times out;
stopping the first timer and activating a second timer when the conflict resolution message is received before the first timer is overtime and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
2. The random access method according to claim 1, further comprising, after the step of activating the first timer:
and restarting a contention-based random access process when the conflict resolution message is received before the first timer is overtime and indicates that contention fails.
3. The random access method according to claim 2, wherein the step of restarting the current contention-based random access procedure when the conflict resolution message is received before the first timer expires and the conflict resolution message indicates that contention fails, specifically comprises:
and when the conflict resolving message is received before the first timer is overtime and indicates that the competition fails, restarting the current competition-based random access process according to the backoff time information carried in the conflict resolving message or the system broadcast message.
4. The random access method according to claim 1, further comprising, after the step of activating the first timer:
when a first Negative Acknowledgement (NACK) message aiming at the MSG3 is received before the first timer is overtime, the first timer is reset, and then the steps of returning to the Distributed Unit (DU) of the network side equipment to send the MSG3 and activating the first timer are carried out.
5. The random access method according to any of claims 1 to 4, further comprising, after the step of activating a second timer:
stopping the second timer upon receiving and successfully decoding the MSG4 before the second timer times out;
sending a second NACK message to the DU and resetting the second timer when the MSG4 is received but not successfully decoded before the second timer times out;
restarting a contention-based random access procedure when the MSG4 is not received before the second timer times out.
6. The random access method of claim 5,
if the MSG3 is an rrc connection setup request message, the MSG4 is an rrc connection setup message or an rrc connection setup reject message;
if the MSG3 is an rrc connection reestablishment request message, the MSG4 is an rrc connection reestablishment message or an rrc connection reestablishment reject message;
if the MSG3 is an rrc connection resumption request message, the MSG4 is an rrc connection resumption message or an rrc connection resumption rejection message.
7. A mobile communication terminal, comprising:
the transceiver is used for sending a message MSG3 to a distributed unit DU of the network side equipment based on the temporary C-RNTI, and is used for controlling the waiting time of solving the conflict message, wherein the DU allocates a cell radio network identifier C-RNTI for the mobile communication terminal, and carries the unique temporary C-RNTI in a random access response RAR to send to the mobile communication terminal, and the RAR also carries an uplink scheduling authorization UL Grant;
a processor, configured to activate a first timer after the transceiver sends a message MSG3 to a distributed unit DU of a network side device;
restarting a contention-based random access process according to backoff time information carried in a system broadcast message when a conflict resolution message is not received before the first timer times out;
stopping the first timer and almost a second timer when the conflict resolution message is received before the first timer times out and indicates that the competition is successful;
wherein the first timer is used to control the latency of the resolve collision message and the second timer is used to control the latency of MSG 4.
8. The mobile communication terminal of claim 7, wherein the processor is further configured to restart the contention-based random access procedure when the conflict resolution message is received before the first timer expires and indicates a contention failure.
9. The mobile communication terminal of claim 8, wherein when the conflict resolution message is received before the first timer expires and the conflict resolution message indicates that contention fails, the current contention-based random access procedure is restarted according to backoff time information carried in the conflict resolution message or a system broadcast message.
10. The mobile communication terminal of claim 7, wherein the processor is further configured to reset the first timer upon receiving a first negative acknowledgement, NACK, message for the MSG3 prior to the first timer;
the transceiver is further configured to resend the MSG3 to the DU after the processor resets the first timer.
11. The mobile communication terminal of any of claims 7 to 10, wherein the processor is further configured to stop the second timer upon receiving and successfully decoding the MSG4 before the second timer expires;
sending a second NACK message to the DU and resetting the second timer when the receiving unit did not successfully decode the MSG4 before the second timer times out;
restarting a contention-based random access procedure when the MSG4 is not received before the second timer times out.
12. The mobile communication terminal of claim 11,
if the MSG3 is an rrc connection setup request message, the MSG4 is an rrc connection setup message or an rrc connection setup reject message;
if the MSG3 is an rrc connection reestablishment request message, the MSG4 is an rrc connection reestablishment message or an rrc connection reestablishment reject message;
if the MSG3 is an rrc connection resumption request message, the MSG4 is an rrc connection resumption message or an rrc connection resumption rejection message.
13. A mobile communication terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the computer program, when executed by the processor, implements a random access method according to any of claims 1 to 6.
14. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the random access method according to any one of claims 1 to 6.
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| CN112770412B (en) * | 2020-12-29 | 2022-09-02 | 紫光展锐(重庆)科技有限公司 | Packet data network PDN activation method and device thereof |
| CN115334683A (en) * | 2021-05-11 | 2022-11-11 | 华为技术有限公司 | Method, apparatus, and storage medium for random access |
| CN115707144A (en) * | 2021-08-06 | 2023-02-17 | 中国电信股份有限公司 | Conflict resolution detection method, device, terminal and storage medium |
| CN114679796A (en) * | 2022-03-09 | 2022-06-28 | 南京大鱼半导体有限公司 | Method and device for establishing communication link, electronic equipment and storage medium |
| CN117241409B (en) * | 2023-11-13 | 2024-03-22 | 湖南大学 | Multi-type terminal random access competition solving method based on near-end policy optimization |
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| CN107027190A (en) * | 2017-06-14 | 2017-08-08 | 武汉虹信通信技术有限责任公司 | A kind of Stochastic accessing contention resolved implementation method for LTE system |
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