CN112153749B - Random access method, system, device and computer readable storage medium - Google Patents

Random access method, system, device and computer readable storage medium Download PDF

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Publication number
CN112153749B
CN112153749B CN201910571510.7A CN201910571510A CN112153749B CN 112153749 B CN112153749 B CN 112153749B CN 201910571510 A CN201910571510 A CN 201910571510A CN 112153749 B CN112153749 B CN 112153749B
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random access
terminal
contention resolution
resolution timer
time length
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CN112153749A (en
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胡春雷
赵晔
齐晓歌
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure provides a random access method, a system, a device and a computer readable storage medium, and relates to the technical field of wireless communication. The random access method comprises the following steps: the terminal judges whether the terminal is in an inactive state when initiating random access to a target cell; under the condition that the terminal is not in an inactive state, the terminal adopts a first contention resolution timer to judge whether random access is successful; under the condition that the terminal is in an inactive state, the terminal judges whether a target cell is a cell in which the terminal enters the inactive state last time; if the target cell is the cell in which the terminal enters the non-activated state last time, the terminal detects whether the random access is successful by adopting a first contention resolution timer; and if the target cell is not the cell which is in the non-activated state last time, the terminal detects whether the random access is successful or not by adopting a second contention resolution timer, wherein the time length of the second contention resolution timer is longer than that of the first contention resolution timer. The random access performance of the terminal in the wireless communication network can be improved.

Description

Random access method, system, device and computer readable storage medium
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a random access method, system, apparatus, and computer-readable storage medium.
Background
The 5G network introduces the Inactive Inactive state of the terminal. For the Inactive state, the same flow and parameters as those of the Idle Idle state are adopted when the terminal is in random access. The prior art designs a contention resolution timer ra-ContentionResolutionTimer.
Fig. 1 shows a diagram illustrating success of random access in a contention-based random access procedure. As shown in fig. 1, four signaling messages MSG1 to MSG4 are involved in the contention-based random access procedure. The contention resolution timer functions as: after the UE sends an RRC recovery request message (MSG 3 for short), if the RRC recovery message (MSG 4 for short) is not received within the duration of the ra-ContentionResolutionTimer, the terminal fails in the current random access and needs to re-initiate the random access.
At present, the random access failure of the terminal frequently occurs, and the random access performance of the terminal in the wireless communication network needs to be improved.
Disclosure of Invention
The inventor researches and discovers that in the prior art, a contention resolution timer is designed based on a scene that a source base station immediately sends MSG4 after receiving MSG3, but the situation that the terminal moves between adjacent cells to cause cell reselection under an Inactive state is not considered. Fig. 2 shows a schematic diagram of random access failure in a contention-based random access procedure. As shown in fig. 2, when the terminal reselects from the source base station to the target base station to initiate random access, the target base station needs to obtain the Context of the terminal from the source base station through the Xn interface after receiving the MSG3, and then can send the MSG4 to the terminal. Therefore, there is a delay of information exchange of the Xn interface between MSG3 and MSG4. When the terminal is located at the edge of the cell, if ra-ContentionResolutionTimer in the prior art is uniformly adopted to detect whether random access is successful, random access failure may be caused because ra-ContentionResolutionTimer is set too small and the contention resolution timer is overtime, so that random access performance is deteriorated.
The technical problem solved by the present disclosure is how to improve the random access performance of a terminal in a wireless communication network.
According to an aspect of an embodiment of the present disclosure, there is provided a random access method, including: the terminal judges whether the terminal is in an inactive state when initiating random access to a target cell; under the condition that the terminal is not in an inactive state, the terminal adopts a first contention resolution timer to judge whether random access is successful; under the condition that the terminal is in an inactive state, the terminal judges whether a target cell is a cell in which the terminal enters the inactive state last time; if the target cell is the cell in which the terminal enters the non-activated state last time, the terminal detects whether the random access is successful by adopting a first contention resolution timer; and if the target cell is not the cell which is in the non-activated state last time, the terminal detects whether the random access is successful or not by adopting a second contention resolution timer, wherein the time length of the second contention resolution timer is longer than that of the first contention resolution timer.
In some embodiments, further comprising: a base station of a target cell measures the maximum duration required for acquiring the context of a terminal from a base station of an adjacent cell; and the base station of the target cell adds the maximum time length with the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, further comprising: and the base station of the target cell adds the preset fixed offset time length with the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, further comprising: before a terminal initiates random access to a target cell, a base station of the target cell sends a system information block message to the terminal, and the time length of a second contention resolution timer is carried in random access channel-configuration public information of the system information block message; the duration of the second contention resolution timer is acquired from the random access channel-configuration common information at the terminal.
In some embodiments, further comprising: before a terminal initiates random access to a target cell, a base station of the target cell sends a system information block message to the terminal, and carries the maximum duration in random access channel-configuration public information of the system information block message; the terminal obtains the maximum time length from the random access channel-configuration public information, and adds the maximum time length and the time length of the first competition resolving timer to obtain the time length of the second competition resolving timer.
In some embodiments, further comprising: before a terminal initiates random access to a target cell, a base station of the target cell sends a system information block message to the terminal, and carries preset fixed offset duration in random access channel-configuration public information of the system information block message; the terminal acquires a preset fixed offset time length from the random access channel-configuration public information, and adds the preset fixed offset time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, the terminal detecting whether the random access is successful by using the second contention resolution timer includes: the terminal judges whether the time delay of receiving the RRC recovery message after sending the RRC recovery request message to the base station of the target cell is longer than the time length of a second contention resolution timer or not; if the time delay is longer than the time length of the second competition resolving timer, the terminal detects that the random access fails; if the time delay is not longer than the time length of the second contention resolution timer, the terminal detects that the random access contention resolution is successful.
According to another aspect of an embodiment of the present disclosure, there is provided a random access system, including a terminal configured to: judging whether the target cell is in an inactive state when initiating random access to the target cell; under the condition that the terminal is not in an inactive state, judging whether random access is successful or not by adopting a first contention resolution timer; under the condition that the terminal is in an inactive state, judging whether a target cell is a cell of which the terminal enters the inactive state last time; if the target cell is the cell in which the terminal enters the non-activated state last time, adopting a first contention resolution timer to detect whether the random access is successful; and if the target cell is not the cell in which the terminal enters the non-activated state last time, detecting whether the random access is successful by adopting a second contention resolution timer, wherein the time length of the second contention resolution timer is longer than that of the first contention resolution timer.
In some embodiments, further comprising a base station of the target cell configured to: measuring the maximum duration required for acquiring the context of the terminal from the base station of the adjacent cell; and adding the maximum time length and the time length of the first competition resolving timer to obtain the time length of the second competition resolving timer.
In some embodiments, further comprising a base station of the target cell configured to: and adding the preset fixed offset duration to the duration of the first contention resolution timer to obtain the duration of the second contention resolution timer.
In some embodiments, the base station of the target cell is further configured to: before a terminal initiates random access to a target cell, a system information block message is sent to the terminal, and the duration of a second contention resolution timer is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: the duration of the second contention resolution timer is acquired from the random access channel-configuration common information.
In some embodiments, the base station of the target cell is further configured to: before a terminal initiates random access to a target cell, sending a system information block message to the terminal, wherein the maximum duration is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: and acquiring the maximum time length from the random access channel-configuration public information, and adding the maximum time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, the base station of the target cell is further configured to: before a terminal initiates random access to a target cell, sending a system information block message to the terminal, wherein a preset fixed offset time length is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: and acquiring preset fixed offset time length from the random access channel-configuration public information, and adding the preset fixed offset time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, the terminal is configured to: judging whether the time delay of receiving the RRC recovery message after the RRC recovery request message is sent to the base station of the target cell is longer than the time length of the second contention resolution timer or not; if the time delay is longer than the time length of the second competition resolving timer, the random access failure is detected; and if the time delay is not greater than the time length of the second contention resolution timer, detecting that the random access contention resolution is successful.
According to still another aspect of an embodiment of the present disclosure, there is provided a random access apparatus including: a memory; and a processor coupled to the memory, the processor configured to perform the foregoing random access method based on instructions stored in the memory.
According to still another aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the instructions, when executed by a processor, implement the foregoing random access method.
The method and the device can solve the problem that random access fails due to overtime of a contention resolution timer caused by information interaction time delay of the Xn interface, thereby improving the random access performance of the terminal in the wireless communication network and ensuring the network communication quality and user experience.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 shows a schematic diagram of successful solution of random access contention in a contention-based random access procedure.
Fig. 2 shows a schematic diagram of random access failure in a contention-based random access procedure.
Fig. 3 shows a flow diagram of some embodiments of the disclosed random access method.
Fig. 4 is a flowchart illustrating a first method for a terminal to obtain a duration of a second contention resolution timer.
Fig. 5 is a flowchart illustrating a second method for a terminal to obtain a duration of a second contention resolution timer.
Fig. 6 is a flowchart illustrating a third method for a terminal to obtain a duration of a second contention resolution timer.
Fig. 7 is a flowchart illustrating a fourth method for a terminal to obtain a duration of a second contention resolution timer.
Fig. 8 shows a schematic structural diagram of a random access system according to some embodiments of the present disclosure.
Fig. 9 shows a schematic structural diagram of a random access apparatus according to some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
Some embodiments of the disclosed random access method are first described in conjunction with fig. 3.
Fig. 3 shows a flow diagram of some embodiments of the disclosed random access method. As shown in fig. 3, the random access method in the present embodiment includes steps S302 to S310.
In step S302, the terminal initiates random access to the target cell.
In step S304, the terminal determines whether it is in an inactive state.
In case the terminal is not in the inactive state, step S306 is performed. In step S306, the terminal determines whether the random access is successful by using a first contention resolution timer.
For example, the duration of the first contention resolution timer may be ra-ContentionResolutionTimer in the prior art.
In case the terminal is in the inactive state, step S308 is performed. In step S308, the terminal determines whether the target cell is a cell in which the terminal has entered the inactive state last time.
If the target cell is the cell in which the terminal last entered the inactive state, step S306 is executed. If the target cell is not the cell in which the terminal last entered the inactive state, step S310 is executed. In step S310, the terminal detects whether the random access is successful by using a second contention resolution timer, where a duration of the second contention resolution timer is greater than a duration of the first contention resolution timer.
The duration of the second contention resolution timer is predefined in the present disclosure, and the unit thereof may be a subframe or a slot. And the terminal judges whether the time delay of receiving the RRC recovery message after sending the RRC recovery request message to the base station of the target cell is greater than the time length of the second contention resolution timer. And if the time delay is longer than the time length of the second competition resolving timer, the terminal detects that the random access fails. If the time delay is not longer than the time length of the second competition resolving timer, the terminal detects that the random access competition resolving is successful.
The random access method provided by the embodiment is suitable for a situation that a cell is reselected when a terminal in an inactive state moves in a 5G network, and can solve the problem of random access failure caused by overtime of a contention resolution timer due to information interaction delay of an Xn interface, so that the random access performance of the terminal in a wireless communication network is improved, and the network communication quality and user experience are guaranteed.
A first method for the terminal to obtain the duration of the second contention resolution timer is described below with reference to fig. 4.
Fig. 4 is a flowchart illustrating a first method for a terminal to obtain a duration of a second contention resolution timer. As shown in fig. 4, before the terminal initiates random access to the target cell, the present embodiment includes steps S4002 to S4008.
In step S4002, the base station of the target cell measures the maximum time length required to acquire the terminal context from the base station of the neighboring cell.
For example, the time lengths required for the base station a of the target cell to measure the terminal context acquired from the base stations B, C, and D of the neighboring cells are B, C, and D, respectively, and then the maximum value among B, C, and D is the maximum time length required for the base station a of the target cell to acquire the terminal context from the base station of the neighboring cells.
In step S4004, the base station of the target cell adds the maximum duration to the duration of the first contention resolution timer to obtain a duration of the second contention resolution timer.
In step S4006, the base station of the target cell sends a System Information Block (SIB) message to the terminal, and carries a duration of the second contention resolution timer in the random access channel-configured common information of the system information block message.
In step S4008, the terminal acquires the duration of the second contention resolution timer from the random access channel-configuration common information. The terminal may obtain the updated duration of the second contention resolution timer when updating the SIB message.
A second method for the terminal to obtain the duration of the second contention resolution timer is described below with reference to fig. 5.
Fig. 5 is a flowchart illustrating a second method for acquiring a duration of the second contention resolution timer by the terminal. As shown in fig. 5, before the terminal initiates random access to the target cell, the present embodiment includes steps S5002 to S5006.
In step S5002, the base station of the target cell adds a preset fixed offset duration to the duration of the first contention resolution timer to obtain a duration of the second contention resolution timer.
In step S5004, the base station of the target cell sends a system information block message to the terminal, and carries the duration of the second contention resolution timer in the random access channel-configuration common information of the system information block message.
In step S5006, the terminal acquires the duration of the second contention resolution timer from the random access channel-configuration common information.
A third method for the terminal to obtain the duration of the second contention resolution timer is described below with reference to fig. 6.
Fig. 6 is a flowchart illustrating a third method for acquiring a duration of the second contention resolution timer by the terminal. As shown in fig. 6, before the terminal initiates random access to the target cell, the present embodiment includes steps S6002 to S6006.
In step S6002, the base station of the target cell measures the maximum time length required to acquire the terminal context from the base station of the neighboring cell.
In step S6004, the base station of the target cell sends a system information block message to the terminal, and carries the maximum duration in the random access channel-configuration public information of the system information block message.
In step S6006, the terminal obtains the maximum duration from the random access channel-configuration public information, and adds the maximum duration to the duration of the first contention resolution timer to obtain the duration of the second contention resolution timer.
A fourth method for the terminal to obtain the duration of the second contention resolution timer is described below with reference to fig. 7.
Fig. 7 is a flowchart illustrating a fourth method for a terminal to obtain a duration of a second contention resolution timer. As shown in fig. 7, the present embodiment includes steps S7002 to S7006 before the terminal initiates random access to the target cell.
In step S7002, the base station of the target cell adds the preset fixed offset duration to the duration of the first contention resolution timer to obtain the duration of the second contention resolution timer.
In step S7004, the base station of the target cell sends a system information block message to the terminal, and carries a preset fixed offset duration in the random access channel-configuration common information of the system information block message.
In step S7006, the terminal obtains a preset fixed offset duration from the random access channel-configuration public information, and adds the preset fixed offset duration to the duration of the first contention resolution timer to obtain the duration of the second contention resolution timer.
In the four embodiments corresponding to fig. 4 to fig. 7, the duration of the second contention resolution timer is redefined by the base station of the target cell, which may be a fixed value or a variable value defined according to the information interaction delay of the Xn interface between the base stations. The time length of the second contention resolution timer is more reasonably defined by the base station setting of the target cell, which is favorable for further improving the random access performance of the terminal in the wireless communication network.
On the other hand, when the base station of the target cell sends the duration of the second contention resolution timer to the terminal, the base station of the target cell may directly send the duration of the second contention resolution timer, or may send a preset fixed offset duration, and the terminal obtains the duration of the second contention resolution timer through calculation. The various information sending modes can adapt to the service requirements under different conditions, and provide convenience for subsequent service expansion.
Some embodiments of the disclosed random access system are described below in conjunction with fig. 8.
Fig. 8 shows a schematic structural diagram of a random access system according to some embodiments of the present disclosure. As shown in fig. 8, the random access system 80 in the present embodiment includes:
a terminal 802 configured to: judging whether the target cell is in an inactive state or not when random access is initiated to the target cell; under the condition that the terminal is not in an inactive state, judging whether random access is successful or not by adopting a first contention resolution timer; under the condition that the terminal is in an inactive state, judging whether a target cell is a cell of which the terminal enters the inactive state last time; if the target cell is the cell in which the terminal enters the non-activated state last time, adopting a first contention resolution timer to detect whether the random access is successful; and if the target cell is not the cell in which the terminal enters the non-activated state last time, detecting whether the random access is successful by adopting a second contention resolution timer, wherein the time length of the second contention resolution timer is longer than that of the first contention resolution timer.
The random access method provided by the embodiment is suitable for the situation that the cell is reselected when the terminal in the inactive state moves in the 5G network, and can solve the problem of random access failure caused by overtime of a contention resolution timer due to information interaction delay of an Xn interface, so that the random access performance of the terminal in the wireless communication network is improved, and the network communication quality and the user experience are guaranteed.
In some embodiments, the base station 804 further comprises a target cell configured to: measuring the maximum duration required for acquiring the context of the terminal from the base station of the adjacent cell; and adding the maximum time length and the time length of the first competition resolving timer to obtain the time length of the second competition resolving timer.
In some embodiments, the base station 804 further comprises a target cell configured to: and adding the preset fixed offset time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
The duration of the second contention resolution timer is redefined by the base station of the target cell, which may be a fixed value or a variable value defined according to the information interaction delay of the Xn interface between the base stations. The time length of the second contention resolution timer is more reasonably defined by the base station setting of the target cell, which is favorable for further improving the random access performance of the terminal in the wireless communication network.
In some embodiments, the base station 804 of the target cell is further configured to: before a terminal initiates random access to a target cell, a system information block message is sent to the terminal, and the duration of a second contention resolution timer is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: the duration of the second contention resolution timer is acquired from the random access channel-configuration common information.
In some embodiments, the base station 804 of the target cell is further configured to: before a terminal initiates random access to a target cell, sending a system information block message to the terminal, wherein the maximum duration is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: and acquiring the maximum time length from the random access channel-configuration public information, and adding the maximum time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
In some embodiments, the base station 804 of the target cell is further configured to: before a terminal initiates random access to a target cell, a system information block message is sent to the terminal, and a preset fixed offset duration is carried in random access channel-configuration public information of the system information block message; the terminal is further configured to: and acquiring preset fixed offset time length from the random access channel-configuration public information, and adding the preset fixed offset time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
When the base station of the target cell sends the time length of the second contention resolution timer to the terminal, the base station of the target cell can directly send the time length of the second contention resolution timer and also can send a preset fixed offset time length, and the terminal obtains the time length of the second contention resolution timer through calculation. The various information sending modes can adapt to the service requirements under different conditions, and provide convenience for subsequent service expansion.
In some embodiments, the terminal 802 is configured to: judging whether the time delay of receiving the RRC recovery message after the RRC recovery request message is sent to the base station of the target cell is longer than the time length of the second contention resolution timer or not; if the time delay is longer than the time length of the second competition resolving timer, the random access failure is detected; and if the time delay is not more than the duration of the second contention resolution timer, detecting that the random access contention resolution is successful.
Some embodiments of the random access apparatus of the present disclosure are described below in conjunction with fig. 9.
Fig. 9 shows a schematic structural diagram of a random access apparatus according to some embodiments of the present disclosure. As shown in fig. 9, the random access apparatus 90 of this embodiment includes: a memory 910 and a processor 920 coupled to the memory 910, the processor 920 being configured to perform the random access method in any of the embodiments based on instructions stored in the memory 910.
Memory 910 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
The random access apparatus 90 may further include an input output interface 930, a network interface 940, a storage interface 950, and the like. These interfaces 930, 940, 950 and the memory 910 and the processor 920 may be connected, for example, by a bus 960. The input/output interface 930 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 940 provides a connection interface for various networking devices. The storage interface 950 provides a connection interface for external storage devices such as an SD card and a usb disk.
The disclosure also includes a computer readable storage medium having stored thereon computer instructions that, when executed by a processor, implement the random access method in any of the foregoing embodiments.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable random access device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable random access device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable random access device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable random access device to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (16)

1. A random access method, comprising:
the terminal judges whether the terminal is in an inactive state when initiating random access to a target cell;
under the condition that the terminal is not in an inactive state, the terminal adopts a first contention resolution timer to judge whether the random access is successful or not;
under the condition that the terminal is in an inactive state, the terminal judges whether a target cell is a cell in which the terminal enters the inactive state last time;
if the target cell is the cell in which the terminal enters the non-activated state last time, the terminal adopts a first contention resolution timer to detect whether the random access is successful;
and if the target cell is not the cell in which the terminal enters the inactive state last time, the terminal detects whether the random access is successful or not by adopting a second contention resolution timer, wherein the time length of the second contention resolution timer is longer than that of the first contention resolution timer, and the second contention resolution timer is determined according to the sum of the maximum time length required for acquiring the context of the terminal from the base station of the adjacent cell and the time length of the first contention resolution timer or the sum of the preset fixed offset time length and the time length of the first contention resolution timer.
2. The random access method of claim 1, further comprising:
a base station of a target cell measures the maximum duration required for acquiring the context of a terminal from a base station of an adjacent cell;
and the base station of the target cell adds the maximum time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
3. The random access method of claim 1, further comprising:
and the base station of the target cell adds a preset fixed offset time length with the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
4. A random access method according to claim 2 or 3, further comprising:
before the terminal initiates random access to the target cell, the base station of the target cell sends a system information block message to the terminal, and carries the time length of the second contention resolution timer in the random access channel-configuration public information of the system information block message;
and acquiring the duration of the second contention resolution timer from the random access channel-configuration public information at the terminal.
5. The random access method of claim 2, further comprising:
before a terminal initiates random access to a target cell, a base station of the target cell sends a system information block message to the terminal, and carries the maximum duration in random access channel-configuration public information of the system information block message;
and the terminal acquires the maximum time length from the random access channel-configuration public information and adds the maximum time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
6. The random access method of claim 3, further comprising:
before a terminal initiates random access to a target cell, a base station of the target cell sends a system information block message to the terminal, and the preset fixed offset duration is carried in random access channel-configuration public information of the system information block message;
and the terminal acquires the preset fixed offset time length from the random access channel-configuration public information, and adds the preset fixed offset time length with the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
7. The random access method of claim 1, wherein the terminal detecting whether the random access is successful using the second contention resolution timer comprises:
the terminal judges whether the time delay of receiving the RRC recovery message after sending the RRC recovery request message to the base station of the target cell is longer than the time length of the second contention resolution timer or not;
if the time delay is longer than the time length of the second contention resolution timer, the terminal detects that the random access fails;
and if the time delay is not greater than the duration of the second contention resolution timer, the terminal detects that the random access contention resolution is successful.
8. A random access system comprising a terminal configured to:
judging whether the target cell is in an inactive state or not when random access is initiated to the target cell;
under the condition that the terminal is not in an inactive state, judging whether random access is successful or not by adopting a first contention resolution timer;
under the condition that the terminal is in an inactive state, judging whether the target cell is the cell in which the terminal enters the inactive state last time; if the target cell is the cell in which the terminal enters the non-activated state last time, adopting a first contention resolution timer to detect whether the random access is successful; if the target cell is not the cell in which the terminal enters the inactive state last time, detecting whether random access is successful or not by adopting a second contention resolution timer, wherein the duration of the second contention resolution timer is greater than that of the first contention resolution timer, and the second contention resolution timer is determined according to the sum of the maximum duration required for acquiring the context of the terminal from the base station of the adjacent cell and the duration of the first contention resolution timer or the sum of the preset fixed offset duration and the duration of the first contention resolution timer.
9. The random access system of claim 8, further comprising a base station of the target cell configured to:
measuring the maximum duration required for acquiring the context of the terminal from the base station of the adjacent cell;
and adding the maximum time length with the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
10. The random access system of claim 8, further comprising a base station of the target cell configured to:
and adding a preset fixed offset time length to the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
11. The random access system of claim 9 or 10,
the base station of the target cell is further configured to: before the terminal initiates random access to the target cell, sending a system information block message to the terminal, and carrying the duration of the second contention resolution timer in the random access channel-configuration public information of the system information block message;
the terminal is further configured to: and acquiring the duration of the second contention resolution timer from the random access channel-configuration common information.
12. The random access system of claim 9,
the base station of the target cell is further configured to: before a terminal initiates random access to a target cell, a system information block message is sent to the terminal, and the maximum duration is carried in random access channel-configuration public information of the system information block message;
the terminal is further configured to: and acquiring the maximum time length from the random access channel-configuration public information, and adding the maximum time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
13. The random access system of claim 10,
the base station of the target cell is further configured to: before a terminal initiates random access to a target cell, sending a system information block message to the terminal, and carrying the preset fixed offset duration in random access channel-configuration public information of the system information block message;
the terminal is further configured to: and acquiring the preset fixed offset time length from the random access channel-configuration public information, and adding the preset fixed offset time length and the time length of the first contention resolution timer to obtain the time length of the second contention resolution timer.
14. The random access system of claim 9, wherein the terminal is configured to:
judging whether the time delay of receiving the RRC recovery message after the RRC recovery request message is sent to the base station of the target cell is greater than the time length of the second contention resolution timer; if the time delay is longer than the time length of the second contention resolution timer, detecting that the random access fails; and if the time delay is not greater than the duration of the second contention resolution timer, detecting that the random access contention resolution is successful.
15. A random access apparatus, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the random access method of any of claims 1-7 based on instructions stored in the memory.
16. A computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when executed by a processor, implement the random access method of any one of claims 1 to 7.
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