CN109286942B - Random access method, system, terminal and computer readable storage medium - Google Patents
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Abstract
The invention discloses a random access method, a system, a terminal and a computer readable storage medium, which relate to the technical field of communication, wherein the method comprises the following steps: the terminal monitors a preamble sequence broadcasted by a base station, wherein the preamble sequence comprises a first preamble sequence set used for first random access and a second preamble sequence set used for second random access; the terminal selects a leader sequence from the first leader sequence set or the second leader sequence set according to the sensitivity of the self service to the time delay; the terminal transmits a random access message including the selected preamble sequence to the base station so that the base station performs the first random access or the second random access according to the selected preamble sequence. The invention enables the base station to identify the random access mode adopted by the terminal according to the random access message.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a random access method, a system, a terminal, and a computer-readable storage medium.
Background
5G includes 3 broad classes of application scenarios: enhanced mobile broadband (eMBB) scenarios, low latency high reliability (URLLC) scenarios, and low power consumption large connectivity (mMTC) scenarios.
In the future, 5G needs to simultaneously meet different requirements of multiple services of 3 large-scale application scenes, and different services have different requirements on time delay. For example, in an eMBB scene, applications such as ultra-high-definition video, video conferencing, and 3D games not only put forward higher demands on communication rate, but also put forward higher demands on time delay; in the URLLC scenario, services such as car networking, industrial control, telemedicine, etc. put higher demands on time delay than the eMBB scenario.
As shown in fig. 1, the conventional random access method includes 4 steps:
step 1, a terminal sends a leader sequence to a base station;
step 2, the base station sends a random access response message to the terminal;
step 3, the terminal sends a layer 2/layer 3(L2/L3) message to the base station;
and step 4, the base station sends a competition resolving message to the terminal.
In order to meet the requirement of low-delay service and further reduce the access delay of users, 3GPP standardization organization provides a 2-step fast random access method. As shown in fig. 2, the fast random access method includes 2 steps:
step 1', the terminal sends a random access message to the base station, wherein the random access message comprises the leader sequence of step 1 and the L2/L3 message of step 3;
and step 2', the base station sends a feedback message to the terminal, wherein the feedback message comprises the random access response message of the step 2 and the competition resolving message of the step 4.
The 3GPP organization currently discusses multiplexing of a URLLC scenario and an eMBB scenario, and a URLLC scenario and an eMBB scenario may multiplex resources of the same carrier frequency in the future. However, in the future 5G cellular mobile network, when low-latency traffic (e.g., traffic in URLLC scenario) and non-low-latency traffic (e.g., traffic in eMBB scenario) share the same carrier frequency, the following problems exist:
if the low-delay service adopts 2-step fast random access and the non-low-delay service adopts the traditional 4-step random access method, the base station can not identify whether the terminal initiates a 2-step random access request or a 4-step random access request under the condition that the base station can not demodulate the message content in the random access message after receiving the random access message according to the current standard.
Therefore, it is necessary to provide a technical solution that enables the terminal to initiate 2-step or 4-step random access according to its service type and requirement, and enables the base station to distinguish the random access mode adopted by the terminal.
Disclosure of Invention
One object of the present invention is: a random access method is provided, which enables a base station to identify a random access mode adopted by a terminal according to a random access message.
According to an aspect of the present invention, there is provided a random access method, including: the terminal monitors a preamble sequence broadcasted by a base station, wherein the preamble sequence comprises a first preamble sequence set used for first random access and a second preamble sequence set used for second random access; the terminal selects a leader sequence from the first leader sequence set or the second leader sequence set according to the sensitivity of the self service to the time delay; the terminal transmits a random access message including the selected preamble sequence to the base station so that the base station performs the first random access or the second random access according to the selected preamble sequence.
In one embodiment, the method further comprises: a terminal monitors a random access threshold value broadcasted by a base station; a terminal acquires the reference signal receiving power of a downlink; the terminal selects a leader sequence from the first leader sequence set or the second leader sequence set according to the sensitivity of the terminal service to time delay, and the method comprises the following steps: and the terminal selects a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of the self service to the time delay, the reference signal receiving power and the random access threshold value.
In one embodiment, the terminal selects a preamble sequence from the first preamble sequence set when the time delay required by the service of the terminal is less than a preset time delay and the reference signal receiving power is not less than the random access threshold value; and under the condition that the time delay required by the self service of the terminal is not less than the preset time delay, the terminal selects the leader sequence from the second leader sequence set.
In one embodiment, the base station dynamically adjusts the random access threshold value based on one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate.
According to another aspect of the present invention, there is provided a terminal comprising: the monitoring unit is used for monitoring the preamble sequences broadcasted by the base station, wherein the preamble sequences comprise a first preamble sequence set used for first random access and a second preamble sequence set used for second random access; a selecting unit, configured to select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to a sensitivity of a service to a delay; a sending unit, configured to send a random access message including the selected preamble sequence to a base station, so that the base station performs the first random access or the second random access according to the selected preamble sequence.
In one embodiment, the monitoring unit is further configured to monitor a random access threshold value broadcast by the base station; the terminal further comprises: an obtaining unit, configured to obtain reference signal received power of a downlink; the selecting unit is configured to select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to a sensitivity of a service to a time delay, the reference signal received power, and the random access threshold.
In an embodiment, the selecting unit is configured to select a preamble sequence from the first preamble sequence set when a delay required by a service of the terminal is smaller than a preset delay and the reference signal received power is not smaller than the random access threshold; and selecting a leader sequence from the second leader sequence set under the condition that the time delay required by the self service of the terminal is not less than the preset time delay.
According to still another aspect of the present invention, there is provided a random access system including: the terminal and the base station according to any of the above embodiments; the base station is used for broadcasting a preamble sequence, wherein the preamble sequence comprises a first preamble sequence set used for first random access and a second preamble sequence set used for second random access; receiving a random access message which is sent by a terminal and comprises the selected leader sequence; performing the first random access or the second random access according to the selected preamble sequence.
In one embodiment, the base station is further configured to broadcast a random access threshold value.
In one embodiment, the base station is configured to perform the first random access if the selected preamble sequence belongs to the first preamble sequence set; performing the second random access in case the selected preamble sequence belongs to the second set of preamble sequences.
In one embodiment, the base station is further configured to dynamically adjust the random access threshold value according to one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate.
According to still another aspect of the present application, there is provided a random access system including: a memory; and a processor coupled to the memory, the processor configured to perform the method of any of the above embodiments based on instructions stored in the memory.
According to a further aspect of the present application, there is provided a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method according to any of the embodiments described above.
In the embodiment of the invention, the leader sequence is divided into a first leader sequence set for first random access and a second leader sequence set for second random access, and the terminal can select the leader sequence from the first leader sequence set or the second leader sequence set according to the sensitivity of the terminal service to time delay and then send the random access message containing the selected leader sequence to the base station, so that the base station can identify the random access mode adopted by the terminal after demodulating the leader sequence in the random access message.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart illustrating a conventional random access method;
fig. 2 is a flow chart diagram of a fast random access method;
fig. 3 is a flow chart of a random access method according to an embodiment of the present invention;
fig. 4 is a flow chart illustrating a random access method according to another embodiment of the present invention;
fig. 5 is a flow chart illustrating a random access method according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a random access system according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a random access system according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a random access system according to yet 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 3 is a flow chart of a random access method according to an embodiment of the invention.
In step 302, the terminal listens to preamble sequences broadcast by the base station, the preamble sequences including a first set of preamble sequences for a first random access and a second set of preamble sequences for a second random access.
Here, the first random access may be the aforementioned 2-step random access, and the second random access may be the aforementioned 4-step random access. The delay of the first random access may be smaller than the delay of the second random access. The first set of preamble sequences and the second set of preamble sequences may be distinguished by different identities. The first set of preamble sequences and the second set of preamble sequences may remain unchanged for a period.
In step 304, the terminal selects a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of the terminal service to the delay.
If the time delay required by the terminal self service is less than the preset time delay, the terminal self service can be judged to be a low-time delay service (sensitive to time delay), and the terminal can randomly select a leader sequence from the first leader sequence set; if the time delay required by the terminal self service is not less than the preset time delay, the terminal self service can be judged to be non-low time delay service (insensitive to time delay), and the terminal can randomly select the leader sequence from the second leader sequence set.
In step 306, the terminal transmits a random access message including the selected preamble sequence to the base station so that the base station performs the first random access or the second random access according to the selected preamble sequence.
If the preamble sequence demodulated by the base station from the random access message belongs to the first preamble sequence set, the base station may identify that the random access mode adopted by the terminal is the first random access, and in this case, the base station may perform an operation corresponding to the first random access, for example, return a feedback message including a random access response message and a contention resolution message to the terminal.
If the preamble sequence demodulated from the random access message by the base station belongs to the second preamble sequence set, the base station may identify that the random access mode adopted by the terminal is the second random access, and in this case, the base station may perform an operation corresponding to the second random access, for example, return a random access response message to the terminal. Thereafter, the terminal may send an L2/L3 message to the base station, which in turn returns a contention resolution message to the terminal.
In this embodiment, the preamble sequence is divided into a first preamble sequence set for first random access and a second preamble sequence set for second random access, and the terminal may select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of its service to delay, and then send a random access message including the selected preamble sequence to the base station, so that the base station can identify a random access mode adopted by the terminal after demodulating the preamble sequence in the random access message.
Considering that some terminals may be at the edge of a cell, in this case, the terminals may not be able to successfully access the base station randomly, so in order to ensure the success rate of the terminal random access, the following optimization scheme is further proposed in the present invention, which is described below with reference to fig. 4.
Fig. 4 is a flowchart illustrating a random access method according to another embodiment of the present invention.
In step 402, the terminal listens to the preamble sequences broadcast by the base station, the preamble sequences including a first set of preamble sequences for a first random access and a second set of preamble sequences for a second random access.
In step 404, the terminal listens to the random access threshold value broadcast by the base station.
In one embodiment, the base station may dynamically adjust the random access threshold value based on one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate.
For example, if the cell coverage area is small, the random access threshold value may be set to a relatively large value; if the cell coverage area is large, the random access threshold value may be set to a relatively small value.
For another example, if the traffic load of the first random access is large and the traffic load of the second random access is small, the random access threshold value may be set to a relatively large value; the random access threshold value may be set to a relatively small value if the traffic load of the first random access is small and the traffic load of the second random access is large.
For another example, if the random access demodulation failure rate of the first random access is large, and the random access demodulation failure rate of the second random access is small, the random access threshold value may be set to a relatively large value; if the random access demodulation failure rate of the first random access is small and the random access demodulation failure rate of the second random access is large, the random access threshold value may be set to a relatively small value.
In step 406, the terminal acquires Reference Signal Received Power (RSRP) of the downlink.
In step 408, the terminal selects a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of the self service to the delay, the reference signal receiving power and the random access threshold value.
In one implementation manner, the terminal selects a preamble sequence from the first preamble sequence set when the time delay required by the service of the terminal is less than the preset time delay and the reference signal receiving power is not less than the random access threshold. And under the condition that the time delay required by the self service of the terminal is not less than the preset time delay, the terminal selects the leader sequence from the second leader sequence set.
In step 410, the terminal transmits a random access message including the selected preamble sequence to the base station so that the base station performs the first random access or the second random access according to the selected preamble sequence.
In this embodiment, the terminal may be adjusted to select a preamble sequence from the first preamble sequence set or the second preamble sequence set by setting the random access threshold, and the terminal may select the preamble sequence from the first preamble sequence set only when the time delay required by the service of the terminal is less than the preset time delay and the reference signal receiving power is not less than the random access threshold, so as to reduce the collision and further improve the success rate of the random access of the terminal.
Fig. 5 is a flowchart illustrating a random access method according to another embodiment of the present invention.
In step 502, the base station broadcasts available preamble sequences including a first set of preamble sequences for a first random access and a second set of preamble sequences for a second random access.
In step 504, the base station broadcasts a random access threshold value.
In step 506, the terminal performs synchronization, performs cell search and selection, and obtains a preamble sequence and a random access threshold value broadcasted by the base station through monitoring.
In step 508, the terminal determines whether the time delay required by the terminal service is less than a preset time delay. If yes, indicating that the self service is a low-delay service, executing step 510; if not, it indicates that the service is a non-low-latency service, then step 512 is executed.
In step 510, the terminal determines whether the downlink reference signal received power is less than a random access threshold; if yes, go to step 514; if not, go to step 512.
In step 512, the terminal randomly selects a preamble sequence from the second set of preamble sequences.
In step 514, the terminal randomly selects a preamble sequence from the first set of preamble sequences.
In step 516, the terminal transmits a random access message including the selected preamble sequence to the base station.
In step 518, the base station performs the first random access or the second random access according to the preamble sequence in the random access message.
In this embodiment, the base station may identify a random access manner adopted by the terminal according to the preamble sequence in the random access message, and the terminal selects the preamble sequence from the first preamble sequence set only when the time delay required by the service of the terminal itself is less than the preset time delay and the reference signal received power is not less than the random access threshold, so that the collision may be reduced and the success rate of the random access of the terminal may be improved.
The random access method provided by each embodiment of the invention is particularly suitable for a wireless cellular network with various services such as low-delay service and non-low-delay service coexisting.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the terminal embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in fig. 6, the terminal includes a listening unit 601, a selecting unit 602, and a transmitting unit 603. The monitoring unit 601 is configured to monitor preamble sequences broadcast by a base station, where the preamble sequences include a first preamble sequence set used for a first random access and a second preamble sequence set used for a second random access. The selecting unit 602 is configured to select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to a sensitivity of the self-service to the delay. The transmitting unit 603 is configured to transmit a random access message including the selected preamble sequence to the base station, so that the base station performs the first random access or the second random access according to the selected preamble sequence.
In this embodiment, the preamble sequence is divided into a first preamble sequence set for first random access and a second preamble sequence set for second random access, and the terminal may select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of its service to delay, and then send a random access message including the selected preamble sequence to the base station, so that the base station can identify a random access mode adopted by the terminal after demodulating the preamble sequence in the random access message.
In one embodiment, in order to improve the random access success rate, the monitoring unit 601 is further configured to monitor a random access threshold value broadcast by the base station. The terminal in this embodiment further includes an obtaining unit configured to obtain reference signal received power of a downlink. Correspondingly, the selecting unit 602 in this embodiment is configured to select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to the sensitivity of the self-service to the delay, the reference signal received power, and the random access threshold. In one implementation, the selecting unit 602 is configured to select a preamble sequence from the first preamble sequence set when a time delay required by a service of the terminal is less than a preset time delay and a reference signal receiving power is not less than a random access threshold; and under the condition that the time delay required by the self service of the terminal is not less than the preset time delay, selecting the leader sequence from the second leader sequence set.
In this embodiment, the terminal may be adjusted to select a preamble sequence from the first preamble sequence set or the second preamble sequence set by setting the random access threshold, and the terminal may select the preamble sequence from the first preamble sequence set only when the time delay required by the service of the terminal is less than the preset time delay and the reference signal receiving power is not less than the random access threshold, so as to reduce the collision and further improve the success rate of the random access of the terminal.
Fig. 7 is a schematic structural diagram of a random access system according to an embodiment of the present invention. As shown in fig. 7, the system includes a terminal 701 and a base station 702 according to any of the above embodiments. The base station 702 is configured to broadcast preamble sequences, which include a first set of preamble sequences for a first random access and a second set of preamble sequences for a second random access; receiving a random access message which is sent by a terminal and comprises the selected leader sequence; performing the first random access or the second random access according to the selected preamble sequence. In one implementation, the base station 702 is configured to perform a first random access if the selected preamble sequence belongs to a first set of preamble sequences; in case the selected preamble sequence belongs to a second set of preamble sequences, a second random access is performed.
In one embodiment, base station 702 is also configured to broadcast a random access threshold value. In one embodiment, base station 702 is further configured to dynamically adjust the random access threshold value based on one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate.
Fig. 8 is a schematic structural diagram of a random access system according to another embodiment of the present invention. As shown in fig. 8, the system includes a memory 801 and a processor 802. The memory 801 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used for storing the corresponding instructions of the method of any one of the previous embodiments. Coupled to the memory 801, the processor 802 may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 802 is configured to execute the instructions stored in the memory 801, so that the base station can identify a random access mode adopted by the terminal according to the random access message.
Fig. 9 is a schematic structural diagram of a random access system according to yet another embodiment of the present invention. As shown in fig. 9, the system 900 includes a memory 901 and a processor 902. The processor 902 is coupled to the memory 901 via a BUS (BUS) 903. The system 900 may also be connected to external storage 905 for the purpose of invoking external data through storage interface 904, and may also be connected to a network or an external computer system (not shown) through network interface 906.
In this embodiment, the data instruction is stored in the memory, and the processor processes the instruction, so that the base station can identify the random access mode adopted by the terminal according to the random access message.
The invention also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any of the preceding embodiments. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. 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 data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, 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 data processing apparatus 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 data processing apparatus 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.
Thus far, the present invention has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The method and apparatus of the present invention may be implemented in a number of ways. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. A random access method, comprising:
a terminal monitors a preamble sequence and a random access threshold value broadcasted by a base station, wherein the preamble sequence comprises a first preamble sequence set used for first random access and a second preamble sequence set used for second random access, and the time delay of the first random access is less than the time delay of the second random access;
a terminal acquires the reference signal receiving power of a downlink;
the terminal selects a leader sequence from the first leader sequence set or the second leader sequence set according to the sensitivity of the self service to time delay, the reference signal receiving power and the random access threshold value;
the terminal sends a random access message including the selected preamble sequence to the base station so that the base station performs the first random access or the second random access according to the selected preamble sequence;
wherein, the base station dynamically adjusts the random access threshold value according to one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate, wherein:
the larger the cell coverage area is, the smaller the random access threshold value is;
the random access threshold value under the condition that the service load of the first random access is greater than the service load of the second random access is greater than the random access threshold value under the condition that the service load of the first random access is less than the service load of the second random access;
the random access threshold value under the condition that the random access demodulation failure rate of the first random access is greater than the random access demodulation failure rate of the second random access is greater than the random access threshold value under the condition that the random access demodulation failure rate of the first random access is less than the random access demodulation failure rate of the second random access.
2. The method of claim 1,
under the condition that the time delay required by the self service of the terminal is less than the preset time delay and the reference signal receiving power is not less than the random access threshold value, the terminal selects a leader sequence from the first leader sequence set;
and under the condition that the time delay required by the self service of the terminal is not less than the preset time delay, the terminal selects the leader sequence from the second leader sequence set.
3. A random access system, comprising a terminal and a base station, wherein the terminal comprises:
a monitoring unit, configured to monitor a preamble sequence and a random access threshold broadcasted by a base station, where the preamble sequence includes a first preamble sequence set used for first random access and a second preamble sequence set used for second random access, and a time delay of the first random access is smaller than a time delay of the second random access;
an obtaining unit, configured to obtain reference signal received power of a downlink;
a selecting unit, configured to select a preamble sequence from the first preamble sequence set or the second preamble sequence set according to a sensitivity of a service to a time delay, the reference signal received power, and the random access threshold;
a transmitting unit, configured to transmit a random access message including the selected preamble sequence to a base station, so that the base station performs the first random access or the second random access according to the selected preamble sequence;
the base station is used for broadcasting the leader sequence and the random access threshold value; receiving a random access message which is sent by a terminal and comprises the selected leader sequence; performing the first random access or the second random access according to the selected preamble sequence;
the base station is further configured to dynamically adjust the random access threshold value according to one or more of the following factors: cell coverage, random access traffic load, random access demodulation failure rate, wherein:
the larger the cell coverage area is, the smaller the random access threshold value is;
the random access threshold value under the condition that the service load of the first random access is greater than the service load of the second random access is greater than the random access threshold value under the condition that the service load of the first random access is less than the service load of the second random access;
the random access threshold value under the condition that the random access demodulation failure rate of the first random access is greater than the random access demodulation failure rate of the second random access is greater than the random access threshold value under the condition that the random access demodulation failure rate of the first random access is less than the random access demodulation failure rate of the second random access.
4. The system of claim 3,
the selection unit is used for selecting a leader sequence from the first leader sequence set under the condition that the time delay required by the self service of the terminal is less than the preset time delay and the receiving power of the reference signal is not less than the random access threshold value; and selecting a leader sequence from the second leader sequence set under the condition that the time delay required by the self service of the terminal is not less than the preset time delay.
5. The system of claim 3 or 4,
the base station is configured to perform the first random access if the selected preamble sequence belongs to the first preamble sequence set; performing the second random access in case the selected preamble sequence belongs to the second set of preamble sequences.
6. A random access system, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-2 based on instructions stored in the memory.
7. A computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of any one of claims 1-2.
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| CN111615208A (en) * | 2019-02-22 | 2020-09-01 | 中国移动通信有限公司研究院 | Random access communication method, device, related equipment and storage medium |
| WO2020199022A1 (en) * | 2019-03-29 | 2020-10-08 | 富士通株式会社 | Method and apparatus for selecting type of random access |
| WO2020198980A1 (en) * | 2019-03-29 | 2020-10-08 | Qualcomm Incorporated | Preamble to demodulation reference signal mapping for random access procedures |
| CN111800858B (en) * | 2019-07-11 | 2023-01-03 | 维沃移动通信有限公司 | Method and equipment for transmitting EDT (enhanced data transfer) data |
| CN113260078A (en) * | 2020-02-07 | 2021-08-13 | 中国移动通信有限公司研究院 | Information reporting method, receiving method device, terminal and network side equipment |
| CN111556448B (en) * | 2020-05-22 | 2021-11-09 | 深圳护龙科技有限公司 | Method and system for time-sensitive information transmission at 5G mobile terminal |
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