CN117768962A - Priority division-based equipment random access method - Google Patents

Abstract

The invention relates to a device random access method based on priority division, belonging to the field of wireless communication. The method comprises the following steps: the network equipment divides the terminal equipment into high-priority and low-priority terminal equipment through the preamble transmission times of the terminal equipment; the network equipment respectively sets a first preamble pool specific to the high-priority terminal equipment and a second preamble pool specific to the low-priority terminal equipment according to the quantity of the high-priority terminal equipment and the low-priority terminal equipment, so that more preamble resources are available in the first preamble pool; the network device sends a Random Access Response (RAR) message with a collision flag f=1 to the terminal device with the preamble collision, receives the low-priority terminal device with the collision flag f=1, and directly performs preamble retransmission attempt. The method reduces the terminal equipment which cannot be successfully accessed into the network due to the limit of the transmission times of the lead code by endowing the terminal equipment with high transmission times of the lead code with higher priority and more available lead code resources, simultaneously reduces the time delay required by the terminal equipment to be accessed into the network, leads the low-priority terminal equipment which is subjected to the lead code collision to be capable of immediately carrying out lead code retransmission attempt by the lead code collision mark, further avoids the waste of resources and increases the success probability of the terminal equipment access while reducing the time delay required by the access.

Description

Priority division-based equipment random access method

Technical Field

Embodiments of the present disclosure relate generally to the field of wireless communications, and in particular, to random access procedures in wireless communication systems.

Background

In a mobile communication system, a terminal device needs to perform a random access procedure to acquire corresponding resources and establish a connection with a network device before transmitting uplink data. In the random access process, the terminal equipment starts the random access process by transmitting a preamble on a Physical Random Access Channel (PRACH), when the network equipment detects that the terminal equipment transmits the preamble, RAR with PUSCH time-frequency domain resources is allocated to the terminal equipment, the terminal equipment which receives the RAR continues to send Msg3 to the network equipment, and if the network equipment can be successfully accessed to the terminal equipment, the terminal equipment sends a connection response message (Msg 4). In the non-competitive random access process, the lead codes of the terminal devices are distributed by the network device in advance, the lead code of each terminal device is unique, and lead code competition among the terminal devices can not occur. However, since the number of terminal devices that need to access the network in the actual access scenario is huge, and the available preamble resources are limited, it is not practical to allocate a specific preamble to each terminal device for access, so contention-based random access is generally adopted in the actual access scenario.

With the rapid development of wireless communication technology, in case of the fact that the interconnection of things has become an important development direction of the communication industry, a large number of terminal devices need to access to the network, which results in that in the random access process based on competition, a plurality of terminal devices select the same preamble code in the same RAO to initiate access to the network device, that is, the phenomenon of preamble collision occurs, and the terminal devices with preamble collision will end up failure in the subsequent random access process.

Only each terminal device in the random access procedureThe opportunity to initiate an access attempt to the base station is sub-possible when at +.>In the secondary access opportunity, the terminal equipment which fails to access the network ends up with access failure, and no access attempt is performed. For some preamble transmission times n is closer +.>Since it has undergone the first n-1 access failures, the remaining opportunities to re-initiate an access attempt are only +.>Not only is the probability of success of access low, but in combination with the delay used for the previous n-1 access failures, this class of terminal devices also has a higher access delay, which may be undesirable for some terminal devices, especially for terminal devices that are sensitive to power consumption and delay.

Disclosure of Invention

Aiming at the problems existing in the prior art, the example embodiment of the disclosure provides a device random access method based on priority division, which can effectively reduce the preamble collision probability of terminal devices, relieve serious congestion of network devices, reduce time delay required by the terminal devices to access a network, and improve the access success probability of the terminal devices.

In a first aspect, there is provided a device random access method based on prioritization, the method comprising: expanding a device random access method based on priority division, and dividing the terminal devices into high-priority terminal devices and low-priority terminal devices by the network device according to the preamble transmission times of the terminal devices;

respectively setting a first preamble pool specific to the high-priority terminal equipment and a second preamble pool specific to the low-priority terminal equipment according to the number of the high-priority terminal equipment and the low-priority terminal equipment;

the network equipment sends a RAR message with a collision mark F=1 for the terminal equipment with the preamble collision, and when the low-priority terminal equipment receives the RAR message with the collision mark F=1, the network equipment directly performs preamble retransmission attempt;

further, in the device random access method based on priority division, a high priority terminal device and a low priority terminal device are set, and the method further includes: the network device transmits the random access preamble code not less than the transmission times of the random access preamble code of the terminal device according to the transmission times of the random access preamble code of the terminal deviceIs regarded as a high priority terminal device, and the number of random access preamble transmissions is less than +.>Is regarded as a low priority terminal device;

further, in the device random access method based on priority division, the method sets the first random access preamble pool specific to the high priority terminal device and the second random access preamble pool specific to the low priority terminal device, and the method further includes: the network equipment sets the first random access preamble pool as the whole random access available preamble pool; the network equipment sets the second random access preamble pool with the same quantity for the current RAO according to the random access preamble of the low-priority terminal equipment which starts the access attempt and is detected in the previous RAO;

further, in the device random access method based on priority division, the network device broadcasts a system message for distinguishing a high priority terminal device from a low priority terminal device, and the method further includes: the network device informs the terminal device which initiates the access attempt in the current RAO by broadcasting a system message to the terminal device, a method for dividing the high priority terminal device and the low priority terminal device, and a first random access preamble pool specific for the high priority terminal device and a second random access preamble pool specific for the low priority terminal device;

further, the network device receives and detects the random access preamble transmitted by the terminal device, and the method further includes: the method comprises the steps that network equipment receives and detects a preamble collision situation of terminal equipment, when the network equipment detects that the preamble has a preamble collision phenomenon, the other preamble collision mark is F=1, and if the network equipment detects that the random access preamble has no preamble collision phenomenon, the other preamble collision mark is F=0;

further, the high priority terminal device and the low priority terminal device receive the RAR sent by the network device, and the method further includes: when the RAR received by the high-priority terminal equipment contains a preamble collision identifier F=1, transmitting Msg3 to the network equipment by using PUSCH in the RAR and frequency domain resources; when the preamble collision identifier contained in the RAR received by the low-priority terminal equipment is f=1, the low-priority terminal equipment is indicated to fail random access at the time and needs to initiate random access attempt again; when the preamble collision identifier contained in the RAR received by the high-priority terminal equipment or the low-priority terminal equipment is f=0, transmitting Msg3 to the network equipment by using the PUSCH and frequency domain resources contained in the RAR;

in a second aspect, there is provided a prioritized based random access apparatus for a device, comprising:

the processing unit is used for expanding a device random access method based on priority division and dividing the terminal device into a high-priority terminal device and a low-priority terminal device;

the obtaining unit is used for obtaining the total access terminal equipment number and the low priority terminal equipment number by the network equipment according to the system model;

a processing unit, configured to allocate a first preamble pool specific to a high priority terminal device and a second preamble pool specific to a low priority terminal device;

an output unit for broadcasting to the terminal devices a high-priority terminal device and a low-priority terminal device dividing method, and a first preamble pool specific to the high-priority terminal device and a second preamble pool specific to the low-priority terminal device;

the processing unit is further used for detecting whether the preamble transmitted by the terminal equipment collides or not;

the output unit is further used for sending a preamble collision mark to the terminal equipment;

in a third aspect, the present application provides an electronic device, comprising: a processor and a memory coupled to the processor, the memory for storing computer program code comprising computer instructions that, when read from the memory by the processor, cause the electronic device to perform the priority-based device random access method of the first aspect.

In a fourth aspect, the present application provides a computer storage medium comprising computer instructions which, when run on a terminal, cause the terminal to perform the priority-based device random access method of the first aspect.

In a fifth aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the priority-based device random access method as described in the first aspect.

By the technical scheme, the traditional random access flow of the terminal equipment is improved, and the high-priority terminal equipment can successfully access the network in the RAO of the current time by making the high-priority terminal equipment have higher probability in the random access of the improved terminal equipment, so that the phenomenon of overtime access of part of terminal equipment is avoided. By setting the preamble collision identification and combining the classification of the terminal equipment, the low-priority terminal equipment with collision can perform preamble retransmission faster, and the waste of partial access resources is avoided while the serious congestion of the network is relieved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is an example communication network implementing embodiments of the present disclosure in embodiments of the present application;

fig. 2 is a flowchart of a random access transmission procedure according to an embodiment of the present application;

FIG. 3 is a flow chart of some methods according to embodiments of the present application;

fig. 4 is a schematic diagram of allocation of a first preamble pool and a second preamble pool in an embodiment of the present application;

FIG. 5 is a flow chart of some methods according to embodiments of the present application;

fig. 6 is a schematic structural diagram of a device random access apparatus based on prioritization according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an electronic device according to an example of the present application.

The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements.

Detailed Description

Principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described for illustrative purposes and to assist those skilled in the art in understanding and practicing the present disclosure without placing any limitation on the scope of the disclosure. The disclosure described herein may be implemented in various ways other than those described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

References in the present disclosure to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It will be understood that, although the terms "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.

As used in this application, the term "circuitry" may refer to one or more, or all, of the following:

(a) Pure hardware circuit implementations (such as implementations in analog and/or digital circuitry only), and

(b) A combination of hardware circuitry and software, such as (if applicable):

(i) A combination of one or more analog and/or digital hardware circuits and software/firmware, and

(ii) Any portion of one or more hardware processors with software (including one or more digital signal processors, software, and one or more memories that work together to cause a device such as a mobile phone or server to perform various functions), and

(c) One or more hardware circuits and/or one or more processors requiring software (e.g., firmware) to run, such as one or more microprocessors or a portion of one or more microprocessors, may not be present when run is not required.

This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also encompasses an implementation of only a hardware circuit or processor (or processors), or an implementation of a hardware circuit or processor and a portion of it (or their) accompanying software and/or firmware. For example and where applicable to the elements of the specific claims, the term circuitry also encompasses a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, a cellular network device, or other computing or network device.

As used herein, the term "wireless communication network" refers to a network that conforms to any suitable wireless communication standard, such as New Radio (NR), long Term Evolution (LTE), LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), high Speed Packet Access (HSPA), etc. The "wireless communication network" may also be referred to as a "wireless communication system". Further, communication between network devices, between a network device and a terminal device, or between terminal devices may be performed in a wireless communication network according to any suitable communication protocol, including, but not limited to, global system for mobile communications (GSM), universal Mobile Telecommunications System (UMTS), long Term Evolution (LTE), new Radio (NR), wireless Local Area Network (WLAN) standards, such as the IEEE 802.11 standard, and/or any other suitable wireless communication standard currently known or developed in the future.

As used herein, the term "network device" refers to a node in a wireless communication network via which a terminal device accesses the network and receives services therefrom. A network device may refer to a Base Station (BS) or an Access Point (AP), such as a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NRNB (also known as a gNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, a low priority node (such as femto, pico, etc.), depending on the terminology and technology applied.

The term "terminal device" refers to any terminal device that may be capable of wireless communication. By way of example, and not limitation, a terminal device may also be referred to as a communication device, user Equipment (UE), subscriber Station (SS), portable subscriber station, mobile Station (MS), or Access Terminal (AT). The terminal devices may include, but are not limited to, mobile phones, cellular phones, smart phones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal Digital Assistants (PDAs), portable computers, desktop computers, image capture terminal devices (such as digital cameras), gaming terminal devices, music storage and playback appliances, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, notebook computer embedded appliances (LEEs), notebook computer mounted appliances (LMEs), USB dongles, smart devices, wireless Consumer Premise Equipment (CPE), and the like. In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" may be used interchangeably. As yet another example, in an internet of things (IOT) scenario, a terminal device may represent a machine or other device that performs monitoring and/or measurements and transmits the results of such monitoring and/or measurements to another terminal device and/or network device. In this case, the terminal device may be a machine-to-machine (M2M) device, which may be referred to as a Machine Type Communication (MTC) device in the 3GPP context. As one particular example, the terminal device may be a UE implementing the 3GPP narrowband internet of things (NB-IoT) standard. Examples of such machines or devices are sensors, metering devices such as priority meters, industrial machines, or household or personal devices, e.g. refrigerators, televisions, personal wearable devices such as watches, etc. In other cases, a terminal device may represent a vehicle or other device capable of monitoring and/or reporting its operational status or other functions associated with its operation.

Fig. 1 is an example wireless communication network 100 implementing embodiments of the present application. The network 100 comprises network devices 101 and different types of terminal devices served by the network devices 101 within their service areas (also referred to as cells 110). The network device 101 may serve high priority terminal devices 102-1 and 102-2 (collectively or individually referred to as high priority terminal devices 102) and low priority terminal devices 103-1 through 103-3 (collectively or individually referred to as low priority terminal devices 103).

As used herein, low priority terminal device refers to a terminal device preamble transmission number satisfying at the network device 101Is provided. The low priority terminal device may be due to a terminal device from a newly activated terminal device or due to a terminal device that initiates a lower number of access attempts. The high priority terminal device means that at the network device 101, the number of device preamble transmissions satisfies +.>Is provided. High priority terminal devices such as terminal devices with high preamble transmission times.

It should be understood that the number of network devices and terminal devices is given for illustrative purposes only and does not imply any limitation. Network 100 may include any suitable number of network devices and terminal devices suitable for implementing embodiments of the present disclosure. Although not shown, it should be understood that one or more terminal devices may be located in cell 110 and served by network device 101.

In general, in order to communicate data with the network device 101, the low priority terminal device 103 or the high priority terminal device 102 may initiate a random access procedure to establish a connection with the network device 101. As mentioned above, during the random access procedure, preambles and messages may be exchanged between the terminal device 103/102 and the network device 101.

Communications in network 100 may conform to any suitable standard including, but not limited to, new Radio (NR), long Term Evolution (LTE), LTE evolution, LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), code Division Multiple Access (CDMA), global system for mobile communications (GSM), and the like. Further, the communication may be performed in accordance with any communication protocol generation currently known or to be developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols.

In some implementations, if the network 100 has a machine-to-machine (M2M) deployment, some or all of the served terminal devices may provide M2M services. M2M deployment has some unique features that differ from traditional mobile broadband services. One of the features is the huge number. It is envisaged that there may be a million UEs in the cell 110 accessing the network device 101, most of which transmit only a very small number of packets.

In addition, some M2M devices have delay tolerance, but other M2M devices, such as those configured to provide public alerts for emergency situations, require low latency in all cases or in some applications. These types of M2M devices may be widely deployed in cells to monitor environments, traffic, etc. In some implementations, the number of terminal device preamble transmissions satisfiesMay be classified as a high priority terminal device, such as high priority terminal device 102 shown in network 100.

In the random access procedure, the high priority terminal device has experienced n-1 random access failures before the network device at the receiving side can successfully detect the nth preamble of the high priority terminal device. At this time, the only opportunity for the high priority terminal device to initiate an access attempt is the remaining available preamble transmission timesAnd twice. The low priority terminal equipment experiences fewer preamble transmissions and the remaining available preamble transmissions are higher. Only have +.>The secondary access failure opportunity, the low priority terminal device has a higher access failure opportunity. Failure of the first n-1 transmissions for high priority terminal devices may result in high latency and power consumption of the entire access procedure, which is undesirable for terminal devices that are demanding in these respects.

According to an embodiment of the present disclosure, a device random access method based on prioritization is provided. In the scheme of the present disclosure, the preambles are divided into a first preamble pool specific to a high-priority terminal device type and a second preamble pool specific to a low-priority terminal device type. A group of high priority terminal devices selects a preamble from a first pool of preambles and transmits the selected preamble to the network device in the RAO. A group of low priority terminal devices selects a preamble from the second pool of preambles and transmits the selected preamble to the network device in the RAO. On the preamble receiving side, the network device detects the preamble in the RAO. And if the preamble collision is detected, transmitting the RAR with the preamble collision mark F=1 to the terminal equipment, and if the preamble collision is not detected, transmitting the RAR with the preamble collision mark F=0 to the terminal equipment.

According to the scheme, when the preamble collision identifier contained in the RAR received by the low-priority terminal equipment is f=1, the RAR is not selected to be used for access, but the random access process is selected to be restarted, namely the random access failure of the low-priority terminal equipment is indicated; when the preamble collision identifier contained in the RAR received by the high-priority terminal device is f=1, the RAR is used for access. In this way, it is possible to avoid access failure and resource waste of all terminal devices caused by transmission of Msg3 using the same RAR resource when one high priority terminal device and one or a group of low priority terminal devices select the same preamble, and in addition, it is possible to make the collided low priority terminal devices perform preamble retransmission attempt faster, reducing the time taken for the low priority terminal devices to transmit Msg3 and receive Msg4, because if multiple terminal devices use the same RAR for Msg3 transmission, there is only a very small probability (which can be regarded as 0 probability) in the network device to successfully access the network.

According to the scheme, whether the total available RAR number of the current network equipment is smaller than the total available preamble number or not, RAR resources are sent for the non-collision preamble first, and then the rest available RAR resources are sent to the terminal equipment which has collision.

The principles and implementations of the present disclosure will be described in detail below with reference to fig. 2, fig. 2 showing a process 200 for random access according to an embodiment of the present disclosure. For discussion purposes, process 200 will be described with reference to FIG. 1. Process 200 may involve network device 101, one or more high priority terminal devices 102, and one or more low priority terminal devices 103 in fig. 1.

The network device 101 determines and broadcasts a system message at the current time slot.

One or more high priority terminal devices 102 select (202-1) one or more preambles from a first pool of preambles specific to a high priority terminal device type. One or more low priority terminal devices 103 select (202-2) one or more preambles from a second pool of preambles specific to the low priority terminal device type (202-1 and 202-2 collectively or individually referred to as 202).

One or more high priority terminal devices 102 transmit (202-1) the selected preamble to the network device 101 in the RAO, and one or more low priority terminal devices 103 also transmit (202-2) the selected preamble to the network device 101 in the RAO.

The network device 101 receives the preambles transmitted (202) by the high-priority terminal device 102 and the low-priority terminal device 103 in the corresponding RAO window, detects the preambles transmitted (202) by the high-priority terminal device 102 and the low-priority terminal device 103 by correlating the received preambles with the local total available preambles, and recognizes the preamble in which collision occurs. When there is a collision of the preamble, the network device 101 allocates (203) a RAR containing a preamble collision flag f=1 to the terminal device that selects the collision preamble. When a certain preamble does not collide, the network device 101 allocates (203) a RAR including a preamble collision flag f=0 to the terminal device that selects the preamble.

The network device 101 transmits (204) the RAR with the preamble collision flag (204-1 and 204-2 collectively or individually referred to as 204) to the terminal device that selected the particular preamble. The high priority terminal device 102 and the low priority terminal device 103 receive (204) the RAR with the preamble collision flag transmitted (204) by the network device 101 in a random access response window.

When the high priority terminal device 102 or the low priority terminal device 103 receives (204) the RAR with the preamble collision flag of f=0, or the high priority terminal device 102 receives (204-1) the RAR with the preamble collision flag of f=1, then the PUSCH included in the RAR is used, and frequency domain resources are used to transmit (205) Msg3 to the network device 101 (205-1 and 205-2 are collectively or individually referred to as 205). When the low priority terminal apparatus 103 receives (204-1) the RAR with the preamble collision flag of f=1, the subsequent transmission flow is not performed. The network device 101 receives (205) the Msg3 message sent by the terminal device, and the network device 101 determines which terminal devices can successfully access the network based on the received Msg3 message.

The network device 101 transmits (206) a connection response message (Msg 4) for the terminal device that successfully accessed the network (206-1 and 206-2 are collectively or individually referred to as 206). When the terminal device receives (206) the transmission of the Msg4 by the network device 101, compares the ID of the terminal device contained in the Msg4 with the ID contained in the terminal device, and when the IDs are the same, it indicates that the terminal device successfully accesses the network, otherwise, it needs to initiate an access attempt again.

Fig. 3 illustrates a flowchart of an example method 300 according to some embodiments of the present disclosure. The method 300 may be implemented at the network device 101 shown in fig. 1. For discussion purposes, the method 300 will be described from the perspective of the network device 101 with reference to the random access procedure of the terminal device of fig. 2.

At block 301, the network device 101 locates a preamble transmission number atIs regarded as a high priority terminal device 102, and the number of preamble transmissions is smaller than +.>Is considered as a low priority terminal device 103.

At block 302, the network device divides a first preamble pool specific to a high priority terminal device and a second preamble pool specific to a low priority terminal device.

At block 303, the network device 101 broadcasts to the terminal devices high and low prioritization methods and a first preamble pool specific to the high priority terminal device and a second preamble pool specific to the low priority terminal device.

In some embodiments, the network device 101 may assign a first pool of preambles to the high-priority terminal device 102 and a second pool of preambles to the low-priority terminal device 103. The high priority terminal device 102 selects a preamble from a first preamble pool for transmission and the low priority terminal device 103 selects a preamble from a second preamble pool for transmission.

At block 304, the network device 101 sends a RAR with collision flag f=1 to the terminal device with the preamble collision, and when receiving the low priority terminal device with collision flag f=1, the network device directly performs a preamble retransmission attempt, and does not perform a subsequent random access procedure.

Fig. 4 illustrates a flowchart of an example method 400 according to some embodiments of the present disclosure. The method 400 may be implemented at the network device 101 shown in fig. 1. For discussion purposes, the method 400 will be described from the perspective of the network device 101 with reference to the random access procedure of the terminal device of fig. 2.

According to embodiments of the present disclosure, the preambles for random access in the network 100 may be divided into two preamble pools, namely a first preamble pool (401) specific to a high priority terminal device 102 type and a second preamble pool (402) specific to a low priority terminal device type. The second preamble pool is part of the first preamble pool, i.e. the first preamble pool comprises the second preamble pool. Each of the two preamble pools includes at least one preamble.

In some embodiments, the preambles in the first and second preamble pools may be orthogonal or substantially orthogonal to each other, which may reduce errors and ambiguity in preamble detection.

The network device 101 allocates all available preambles for the high-priority terminal device 102, and when there are N total available preambles, the first preamble number specific to the high-priority terminal device among the i RAOs isThe method comprises the following steps:

low priority terminal device for initiating access attempt in previous RAOThe proportion of the number of the spare 103 to the total number of terminal devices is divided into a second preamble pool specific to the low priority terminal devices. When the total number of devices initiating an access attempt in the RAO of the i-1 th is M _i-1 The low priority terminal device hasWhen the total available preambles are N, the number of preambles N in the second preamble pool allocated in the ith RAO for the low priority terminal equipment _i ^s The method comprises the following steps:

fig. 5 illustrates a flowchart of an example method 500 according to some embodiments of the present disclosure. The method 500 may be implemented at the network device 101 shown in fig. 1. For discussion purposes, the method 500 will be described from the perspective of the network device 101 with reference to the random access procedure of the terminal device of fig. 2.

At block 501, the network device 101 cross-correlates the received preamble sent by the terminal device with the local preamble to determine the collision of the preamble.

At block 502, when a preamble collides, then proceed to block 503-1; when a collision does not occur with a certain preamble, then the flow proceeds to block 503-2.

At block 503-1, the network device 101 transmits a RAR with a preamble collision flag f=1 for the terminal device that has collided with the preamble.

At block 503-2, the network device 101 transmits a RAR with a preamble collision flag of f=0 for the terminal device that did not collide with the preamble.

At block 504, the terminal device receives the RAR with the preamble collision flag f=1 sent by the network device 101, if the high priority terminal device 102 collides with the preamble, then it goes to block 505-1; if a preamble collision occurs at the low priority terminal 103, then block 505-2 is entered.

At block 505-1, the high priority terminal device 102 transmits Msg3 to the network device 101 according to the received PUSCH time-frequency domain resources available for transmission of Msg3 in the RAR sent by the network device 101, and continues with the subsequent access procedure.

At block 505-2, the low priority terminal device 102 directly makes a preamble retransmission attempt and does not continue transmitting Msg3 to the network device 101.

At block 506, since no preamble collision occurs at the terminal device selecting the preamble, both the high priority terminal device 102 and the low priority terminal device 103 may transmit Msg3 to the network device using the PUSCH for Msg3 transmission in the RAR transmitted by the network device 101, and continue the subsequent access procedure.

The random access method of the equipment based on priority division reduces the time delay required by the high-priority terminal equipment to access the network by dividing the high priority and the low priority of the terminal equipment and respectively distributing the first preamble specific to the high-priority terminal equipment and the second preamble specific to the low-priority terminal equipment, further, introduces a preamble collision mark, so that the low-priority terminal equipment with preamble collision can immediately perform preamble retransmission attempt, reduces the time delay required by access, simultaneously avoids resource waste and increases the success probability of terminal equipment access.

In case of an integrated unit, fig. 6 shows a schematic diagram of a priority-based random access apparatus of the apparatus according to the above embodiment. The device comprises: an obtaining unit 601, a processing unit 602, and an output unit 603.

An obtaining unit 601, configured to obtain, according to a system model, the number of terminal devices and the number of low-priority terminal devices that are involved in access;

a processing unit 602, configured to allocate a first preamble pool specific to a high priority terminal device and a second preamble pool specific to a low priority terminal device;

an output unit 603 for broadcasting to the terminal devices a high-priority terminal device and a low-priority terminal device dividing method, and a first preamble pool specific to the high-priority terminal device and a second preamble pool specific to the low-priority terminal device;

the processing unit 602 is further configured to detect whether a preamble transmitted by the terminal device collides;

an output unit 603, configured to send a preamble collision flag to a terminal device;

it should be further noted that, for convenience and brevity of description, a specific working process of the above-described priority-based random access device may refer to a corresponding process in the foregoing method embodiment, which is not described herein again.

Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 7, the apparatus may include a processor 701 and a memory 702, where the processor 701 is coupled to the memory 702, and the memory is configured to store computer program code, where the computer program code includes computer instructions, when the processor reads the computer instructions from the memory, cause the electronic device to execute the device random access method based on prioritization provided in the embodiment.

The present application also provides a computer readable storage medium, which may include a computer program or instructions, which when executed on a computer, cause the computer to perform the priority-based device random access method described in the above embodiments.

Embodiments of the present application provide a computer program product comprising a computer program or instructions which, when run on a computer, cause the computer to perform the priority-based device random access method described in the above embodiments.

The above-described embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination. When implemented using a software program, the embodiments described above may be wholly or partially in the form of a computer program product including one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part.

It should be understood that the disclosed systems, apparatus and methods may be implemented in other ways, and that the apparatus embodiments described above are merely illustrative, for example, the division of the elements is merely a logical function division, and that other divisions may be implemented in practice, for example, multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical, or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims (10)

1. A method for device random access based on prioritization, the method comprising:

expanding a device random access method based on priority division;

the network equipment divides the terminal equipment into high-priority terminal equipment and low-priority terminal equipment according to the preamble transmission times of the terminal equipment;

the network equipment allocates a first preamble pool with more preambles for the high-priority terminal equipment and allocates a second preamble pool with fewer preambles for the low-priority terminal equipment;

and the network equipment sends the RAR message with the collision mark F=1 to the terminal equipment with the preamble collision, and when the low-priority terminal equipment receives the RAR message with the collision mark F=1, the network equipment directly performs preamble retransmission attempt.

2. The priority-based device random access method of claim 1, wherein the high priority terminal device and the low priority terminal device are set, the method further comprising:

the network device will be higher than the random access preamble according to the number of random access preamble transmissions of the terminal deviceAnd if not, the terminal device is regarded as the high-priority terminal device, otherwise, the terminal device is regarded as the low-priority terminal device.

3. The priority-based random access method of a device according to claim 1, wherein after obtaining the high priority terminal device and the low priority terminal device, the method further comprises: and respectively setting a first preamble pool specific to the high-priority terminal equipment and a second preamble pool specific to the low-priority terminal equipment according to the number of the high-priority terminal equipment and the number of the low-priority terminal equipment.

The network equipment sets the first random access preamble pool as the whole random access available preamble pool;

the network device sets a certain number of second random access preamble pools according to the number of random access preambles transmitted by the detected low-priority terminal device initiating an access attempt.

4. The prioritized device random access method of claim 1, wherein after obtaining a first pool of preambles specific to the high-priority terminal device and a second pool of preambles specific to the low-priority terminal device, the method further comprises:

before the RAO, the network device informs the terminal device that the access attempt is initiated in the current random access slot (RAO) by broadcasting a system message to the terminal device, a method of partitioning the high priority terminal device and the low priority terminal device thereof, and a first random access preamble pool specific to the high priority terminal device and a second random access preamble pool specific to the low priority terminal device.

5. The priority-based device random access method of claim 1, wherein after a network device broadcasts a system message for distinguishing the high priority terminal device from the low priority terminal device to the terminal devices, the method further comprises:

the network device receives and detects the preamble collision situation of the terminal device, when the network device detects that the preamble has the preamble collision phenomenon, the preamble collision mark is f=1, and when the network device detects that the random access preamble does not have the random access preamble collision phenomenon, the preamble collision mark is f=0.

6. The prioritized device random access method of claim 1, wherein after the terminal device receives the system message of the network device, the method further comprises:

when the high-priority terminal equipment receives that the preamble collision identifier is F=1 in the RAR, sending a random access connection request message (Msg 3) by using a frequency domain resource when a Physical Uplink Shared Channel (PUSCH) contained in the RAR is used;

when the RAR received by the low-priority terminal equipment contains the preamble collision identifier as F=1, the low-priority terminal equipment is indicated to fail the random access at the time and needs to initiate random access attempt again;

and when the RAR received by the high-priority terminal equipment or the low-priority terminal equipment contains the preamble collision identifier as F=0, transmitting the Msg3 by using the PUSCH time-frequency domain resource contained in the RAR.

7. A prioritized-based random access apparatus for a device, the apparatus comprising:

the processing unit is used for expanding a device random access method based on priority division and dividing the terminal device into a high-priority terminal device and a low-priority terminal device;

the obtaining unit is used for obtaining the total number of terminal devices participating in access and the number of low-priority terminal devices by the network device according to a system model;

the processing unit is further configured to allocate the first preamble pool specific to the high priority terminal device and the second preamble pool specific to the low priority terminal device;

the output unit is configured to broadcast the high-priority terminal device and the low-priority terminal device dividing method, and the first preamble pool specific to the high-priority terminal device and the second preamble pool specific to the low-priority terminal device;

the processing unit is further configured to detect whether a preamble transmitted by the terminal device collides;

the output unit is further configured to send the preamble collision flag to the terminal device.

8. An electronic device, comprising: a processor and a memory coupled to the processor, the memory for storing computer program code, the computer program code comprising computer instructions that, when read from the memory by the processor, cause the electronic device to perform the priority-based device random access method of any of claims 1-6.

9. A computer readable storage medium comprising computer instructions which, when run on a terminal, cause the terminal to perform the priority-based device random access method of any of claims 1 to 6.

10. A computer program product, which, when run on a computer, causes the computer to perform the priority-based device random access method of any of claims 1-6.