WO2018209956A1

WO2018209956A1 - Unlicensed band random access method and device

Info

Publication number: WO2018209956A1
Application number: PCT/CN2017/118122
Authority: WO
Inventors: 王三新
Original assignee: 深圳市金立通信设备有限公司
Priority date: 2017-05-14
Filing date: 2017-12-22
Publication date: 2018-11-22
Also published as: CN108882340A

Abstract

Disclosed in the present invention is an unlicensed band random access method, comprising: a base station divides M UE into M1 UE groups, and forms UE group information; each UE group corresponds to an activation period; the base station broadcasts a broadcast message, the broadcast message being used for activating the UE group corresponding to the current activation period of the base station, in order to instruct the UE in the UE group to access an unlicensed band channel. Also provided in the embodiments of the present invention are a base station and a UE. Using the embodiments of the present invention can prevent the problems of serious conflict when UE access an unlicensed band channel, such that the UE can access the unlicensed band channel normally.

Description

Unlicensed frequency band random access method and device

Technical field

The present invention relates to the field of random access, and in particular, to an unlicensed frequency band random access method and device

Background technique

The rapid development of intelligent mobile terminals, the rapid increase in the number of users, and the emergence of high-definition streaming media services are increasing. The demand for spectrum resources in mobile communication systems is also increasing. The scarcity of spectrum resources severely restricts the capacity of Long Term Evolution (LTE) networks. At present, a large number of unlicensed spectrum has been opened in the world. In this case, if it can be effectively utilized, the contradiction between insufficient LTE licensed spectrum resources and data demand growth can be solved. LTE in the unlicensed band implements the use of unlicensed spectrum through carrier aggregation technology, supplements the limited LTE licensed spectrum with a large number of unlicensed spectrum to increase the available spectrum, effectively expand the wireless capacity, ease the traffic pressure of the mobile network, and improve the capacity of the LTE network. More and more attention is being paid by operators and equipment vendors.

Random access is a process of accessing a network before a User Equipment (UE) starts communicating with the network. There are two random access procedures in LTE: contention based random access and non-contention based random access procedure. The difference between the two is mainly based on the non-contention random access procedure, which specifies the preamble before the random access, and the contention-based random access procedure does not allocate a dedicated preamble to the UE before the random access. Regardless of the random access method, the following processes are required: the base station broadcasts a physical random access channel (PRACH) configuration; the UE transmits a preamble on the PRACH through the PRACH configuration; and the base station allocates an uplink to the user. Resource; the UE performs data transmission on the allocated uplink resource. However, in both of these modes, there is a serious problem that the user equipment accesses the unlicensed band channel conflict, and the user equipment cannot access the unlicensed band channel normally.

Summary of the invention

The embodiment of the invention provides a method and a device for random access in an unlicensed frequency band, which is beneficial to solve the problem that the user equipment accesses the unlicensed frequency band channel conflict seriously, so that the user equipment can normally access the unlicensed frequency band channel.

In a first aspect, an embodiment of the present invention provides a method for random access in an unlicensed frequency band, including:

The base station divides the M user equipments into M1 user equipment groups to form user equipment group information; each user equipment group corresponds to one activation period;

The base station broadcasts a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band channel.

In a feasible embodiment, the broadcasting, by the base station, a broadcast message includes:

When the base station accesses the unlicensed band channel for the first time in each of the activation periods, the broadcast message is broadcasted to indicate that the user equipment in the activated user equipment group of the M user equipments accesses the unlicensed frequency band. channel.

In a possible embodiment, the broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, and an activation period of the activated user equipment group. The duration, the preamble set of the user equipment group, and the physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.

In a feasible embodiment, the broadcast message includes a first broadcast message and a second broadcast message.

The first broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, and a duration of an activation period of the activated user equipment group;

The second broadcast message includes at least one of the following: a preamble configuration of the user equipment group, and a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.

In a possible embodiment, the broadcast message further includes a third broadcast message, and the method further includes:

The base station broadcasts a discovery reference signal and a third broadcast message each time the base station accesses the unlicensed band channel in the each activation period, where the discovery reference signal is used to notify the user equipment that the base station has been accessed. And the third broadcast message is used to notify the user equipment of the duration T _L occupied by the base station to access the unlicensed band channel.

In a possible embodiment, the base station sends the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or

The base station sequentially sends the first broadcast message, the second broadcast message, and the third broadcast message on different or the same frequency resources.

In a possible implementation, the base station divides the M user equipment into M1 user equipment groups, including:

The base station divides the M user equipments into N different subnets according to the IP address according to the variable length subnet mask VLSM, and each subnet corresponds to one user equipment group; wherein each user equipment in the user equipment group Have a unique identifier; or

The base station divides the M user equipments into M1 user equipment groups according to an International Mobile Subscriber Identity (IMSI) of the user equipment.

In a possible embodiment, the packet message of the user equipment includes at least one of the following: a VLSM of the user equipment group, an IP address of each user equipment in the user equipment group, the The IMSI of the user equipment in the user equipment group and the effective backoff parameters of the user equipment in the user equipment group.

In a possible embodiment, after the base station broadcasts a broadcast message, the method further includes:

Receiving, by the base station, a first channel access request sent by the N1 user equipments of the activated user equipment, the channel access request is used to request that the N1 user equipments are allowed to access the unlicensed frequency band channel;

Determining, by the base station, the number N2 of preambles included in the channel access request, where the preamble is in one-to-one correspondence with the user equipment;

When determining that the number N2 of the preambles is greater than or equal to the capacity N of the base station, the base station randomly selects N user equipments from user equipments corresponding to the N2 preambles;

The base station sends a first response message to N3 user equipments, where N3 is equal to the N;

When the base station determines that the number N2 of the preamble is smaller than the capacity N of the base station, the base station sends a first response message to the N3 user equipments, where the N3 is equal to the N2;

The first response message is used to indicate that the N3 user equipments are allowed to access the unlicensed band channel.

In a possible embodiment, after the base station sends the first response message to the N3 user equipments, the method includes:

And receiving, by the N3 user equipments, a second channel access request, where the second request message is used to request to access an unlicensed band channel, where the second channel access request includes a user equipment identifier;

When the base station detects at least two user equipment identifiers on one time slot of the indicated channel of the PRACH configuration, the base station identifies the corresponding user to the at least two user equipments. The device sends a second response message, where the second response message is used to notify the at least two user equipments that the corresponding user equipment fails to access the unlicensed band channel;

When the base station detects only one user equipment identifier on one time slot of the indicated channel of the PRACH configuration according to the user equipment identifier, the base station sends a first user equipment to the user equipment corresponding to the one user equipment identifier. And a second response message, where the second response message is used to notify the user equipment that the user equipment is connected to access the unlicensed band channel successfully.

A second aspect of the present invention provides a method for random access in an unlicensed frequency band, which includes:

The user equipment receives the broadcast message sent by the base station;

The user equipment accesses the unlicensed band channel according to the broadcast message.

In a possible embodiment, the broadcast message includes a third broadcast message, and the method further includes:

Receiving, by the user equipment, a discovery reference signal and a third broadcast message broadcast by the base station;

The discovery reference signal is used to notify the user equipment that the base station has accessed the unlicensed band channel, and the third broadcast message is used to notify the user equipment that the base station accesses the unlicensed band channel. Duration T _L .

In a possible embodiment, the broadcast message includes a first broadcast message and a second broadcast message, the first broadcast message including user equipment group information, an activation start time of the activated user equipment group, and the activated The duration of the activation period of the user device group,

The user equipment accessing the unlicensed band channel according to the broadcast message includes:

After receiving the first broadcast message, the user equipment confirms whether it is activated according to the user equipment grouping information;

When the user equipment determines that it is activated and its data needs to be transmitted, the user equipment listens to and receives the second broadcast message within the duration of the activation period from the activation start time.

In a possible implementation, the user equipment accessing the unlicensed band channel according to the broadcast message includes:

The user equipment initiates a sleep function when it determines that it is activated according to the user equipment grouping information and that it has no data to transmit, or determines that it is not activated according to the user grouping information.

In a possible embodiment, the broadcast message includes a third broadcast message, where the third broadcast message includes a duration T _{L of} the base station accessing the unlicensed band channel, and the user equipment receives the After the third broadcast message, the user equipment accessing the unlicensed band channel according to the broadcast message specifically includes:

The user equipment splices the unlicensed band channels corresponding to the duration T _L into an equivalent continuous channel in the time domain.

In a possible implementation, the second broadcast message includes a physical random access channel (PRACH) configuration of the unlicensed band channel accessed by the base station, and the user equipment accesses the unlicensed band channel according to the broadcast message. include:

The user equipment randomly selects one time slot from consecutive T random access slots starting from the first available random access slot RAS of the subchannel of the equivalent continuous channel according to the PRACH configuration. Transmitting time slot

The user equipment sends a first channel access request by using the sending time slot, where the first channel access request is used to request that the user equipment be allowed to access an unlicensed band channel.

In a possible implementation, the second broadcast message includes a preamble set of the user equipment group, and the user equipment sending the first channel access request by using the sending time slot includes:

The user equipment randomly selects a preamble from a preamble set of the user equipment group;

The user equipment sends the first channel access request carrying the selected preamble through the sending time slot.

In a possible embodiment, after the user equipment sends the first channel access request by using the sending time slot, the user equipment accessing the unlicensed band channel according to the broadcast message includes:

The user equipment starts a timer;

When the base station is not connected to the unlicensed band channel, the timer stops counting; when the base station accesses the unlicensed band channel again, the user equipment starts the timer to continue counting;

When the user equipment receives the first response message sent by the base station in the counting duration of the timer, the user equipment sends the second channel access to the base station by using the uplink resource indicated by the PRACH configuration. The first response message is used to indicate that the user equipment is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment.

When the first response message is not received within the duration of the timer count, the user equipment resends the first channel access request to the base station after a preset backoff time.

In a possible implementation, after the user equipment sends a second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the user equipment accesses the unlicensed frequency band according to the broadcast message. The channel includes:

Receiving, by the user equipment, a second response message sent by the base station, where the second response message is used to notify the user equipment whether the unlicensed band channel is successfully accessed;

When the second response message sent by the base station is not received within the preset duration, the user equipment resends the second channel access request to the base station.

In a third aspect, an embodiment of the present invention provides a base station, including:

a grouping module, configured to divide M user equipments into M1 user equipment groups to form user equipment grouping information; each user equipment group corresponds to one activation period;

a first broadcast module, configured to broadcast a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses an unlicensed frequency band channel .

In a possible embodiment, the first broadcast module is specifically configured to:

In a possible embodiment, the broadcast message further includes a third broadcast message, and the base station further includes:

a second broadcast module, configured to broadcast a discovery reference signal and a third broadcast message each time the unlicensed band channel is accessed in each of the activation periods, where the discovery reference signal is used to notify the user equipment of the base station The third broadcast message is used to notify the user equipment of the duration T _L occupied by the base station for accessing the unlicensed band channel.

In a feasible embodiment, the base station simultaneously sends the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or

In a possible embodiment, the grouping module is specifically configured to:

According to the variable length subnet mask VLSM, the M user equipments are divided into N different subnets according to the IP address, and each subnet corresponds to one user equipment group; wherein each user equipment in the user equipment group has a unique identifier ;or

The M user equipments are divided into M1 user equipment groups according to the International Mobile Subscriber Identity (IMSI) of the user equipment.

In a possible embodiment, after the first broadcast module broadcasts a broadcast message, the base station further includes:

a first receiving module, configured to receive a first channel access request sent by the N1 user equipments of the activated user equipment, where the channel access request is used to request to allow the N1 user equipments to access the exemption Band channel

a determining module, configured to determine a number N2 of preambles included in the channel access request, where the preamble is in one-to-one correspondence with the user equipment;

a selection module, configured to: when determining that the number N2 of the preambles is greater than or equal to the capacity N of the base station, randomly selecting N user equipments from user equipments corresponding to the N2 preambles;

a first sending module, configured to send a first response message to the N3 user equipment, where the N3 is equal to the N;

The first sending module is further configured to: when the base station determines that the number N2 of the preambles is smaller than the capacity N of the base station, send a first response message to the N3 user equipments, where the N3 is equal to the The first response message is used to indicate that the N3 user equipments are allowed to access the unlicensed band channel.

In a possible embodiment, after the first sending module sends the first response message to the N3 user equipments, the base station includes:

a second receiving module, configured to receive a second channel access request sent by the N3 user equipment, where the second request message is used to request access to an unlicensed band channel, and the second channel access request includes a user equipment Identification

a second sending module, configured to: when the base station detects at least two user equipment identifiers on a time slot of the indicated channel of the PRACH configuration, according to the user equipment identifier, to identify the at least two user equipments The corresponding user equipment sends a second response message, where the second response message is used to notify that the user equipment corresponding to the at least two user equipment identifiers fails to access the unlicensed band channel;

The second sending module is further configured to: when the base station detects only one user equipment identifier on one time slot of the indicated channel configured by the PRACH according to the user equipment identifier, corresponding to the one user equipment identifier The user equipment sends a second response message, where the second response message is used to notify the user equipment that the corresponding user equipment accesses the unlicensed band channel successfully.

In a fourth aspect, an embodiment of the present invention provides a user equipment, including:

a first receiving module, configured to receive a broadcast message sent by the base station;

And an access module, configured to access the unlicensed band channel according to the broadcast message.

In a possible embodiment, the broadcast message includes a third broadcast message, and the user equipment further includes:

a second receiving module, configured to receive a discovery reference signal and a third broadcast message broadcast by the base station;

In a possible embodiment, the broadcast message includes a first broadcast message and a second broadcast message, the first broadcast message including user equipment group information, an activation start time of the activated user equipment group, and the activated The duration of the activation period of the user equipment group, the access module includes:

a determining unit, after the first receiving module receives the first broadcast message, confirming whether it is activated according to the user equipment grouping information;

And a first receiving unit, configured to: when the user equipment determines that it is activated and its data needs to be transmitted, listens to and receives the second broadcast message within a duration of the activation period from the activation start time.

In a possible embodiment, the access module includes:

The first initiating unit is configured to start a sleep function when it is determined that the user equipment grouping information is activated according to the user equipment grouping information and there is no data to be transmitted, or when it is determined that the user equipment group information is not activated according to the user grouping information.

In a possible embodiment, the broadcast message includes a third broadcast message, where the third broadcast message includes a duration T _{L of} the base station accessing the unlicensed band channel, and the user equipment receives the After the third broadcast message, the access module includes:

And a splicing unit, configured to splice the unlicensed band channels corresponding to the duration T _L into an equivalent continuous channel in the time domain.

In a possible implementation, the second broadcast message includes a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station, and the access module includes:

a selecting unit, configured to arbitrarily select one time slot from consecutive T random access slots starting from a first available random access slot RAS of the subchannel of the equivalent continuous channel according to the PRACH configuration As a transmission slot;

And a first sending unit, configured to send, by using the sending time slot, a first channel access request, where the first channel access request is used to request that the user equipment be allowed to access an unlicensed band channel.

In a possible embodiment, the second broadcast message includes a preamble set of a user equipment group, and the first sending unit is specifically configured to:

Selecting a preamble randomly from a set of preambles of the user equipment group;

Transmitting, by the transmission slot, the first channel access request carrying the selected preamble.

In a possible implementation, after the first sending unit sends the first channel access request by using the sending time slot, the access module includes:

a second timer unit, configured to start a timer; when the base station does not access the unlicensed band channel, stop timing; when the base station accesses the unlicensed band channel again, the start timer continues to count;

a second sending unit, configured to: when the user equipment receives the first response message sent by the base station in the counting duration of the timer, send the second resource to the base station by using the uplink resource indicated by the PRACH configuration a channel access request, the first response message is used to indicate that the user equipment is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment.

The third sending unit is configured to resend the first channel access request to the base station after a preset backoff time when the first response message is not received within the duration of the timer counting.

In a possible implementation, after the second sending unit sends the second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the access module includes:

a second receiving unit, configured to receive a second response message sent by the base station, where the second response message is used to notify the user equipment whether the unlicensed band channel is successfully accessed;

And a fourth sending unit, configured to resend the second channel access request to the base station when the second response message sent by the base station is not received within a preset duration.

In a fifth aspect, the embodiment of the present invention further provides a storage medium, where the instruction medium is stored, and the method of any one of the embodiments of the present invention is implemented.

In a sixth aspect, an embodiment of the present invention further provides a base station, including a memory, a processor, and a computer program stored in the memory and operable on the processor, where the processor executes the computer program A method as described in any one of the base station implementations is implemented.

In a seventh aspect, an embodiment of the present invention further provides a user equipment, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program The method as described in any of the terminals is implemented.

It can be seen that, in the solution of the embodiment of the present invention, the base station divides the M user equipments into M1 user equipment groups to form user equipment group information; each user equipment group corresponds to one activation period; the base station broadcasts a broadcast message, The broadcast message is used to activate the user equipment group corresponding to the activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band channel. The user equipment receives the broadcast message and accesses the unlicensed band channel according to the broadcast message. The solution of the embodiment of the present invention is beneficial to solve the problem that the user equipment accesses the unlicensed frequency band channel conflict seriously, so that the user equipment can normally access the unlicensed frequency band channel.

These and other aspects of the invention will be more apparent from the following description of the 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 embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a schematic diagram of an application scenario of a method for random access of an unlicensed band according to an embodiment of the present disclosure;

2 is a schematic flowchart of a method for random access of an unlicensed band according to an embodiment of the present invention;

3 is a schematic flowchart of another method for random access of an unlicensed band according to an embodiment of the present invention;

4 is a schematic diagram of an equivalent continuous channel;

FIG. 5 is a schematic flowchart of another method for random access of an unlicensed band according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a partial structure of a user equipment according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another base station according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The details are described below separately.

The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present invention are used to distinguish different objects, and are not intended to describe a specific order. . Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

Referring to FIG. 1, FIG. 1 is a schematic diagram of an application scenario of a method for random access of an unlicensed band according to an embodiment of the present invention. As shown in FIG. 1 , the application scenario includes: a user equipment 101 and a base station 102. The user equipment 101 and the base station 102 perform data transmission by using a wireless communication method.

The user equipment 101, also known as a terminal equipment, is a device that provides voice and/or data connectivity to a user, for example, a handheld device with a wireless connection function, an in-vehicle device, and the like. Common terminals include, for example, mobile phones, tablets, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, and the like.

The foregoing base station 102 can be a macro base station, a micro base station, a pico base station, a distributed base station, or other types of base stations.

Referring to FIG. 2, FIG. 2 is a schematic flowchart of a method for random access in an unlicensed frequency band according to an embodiment of the present invention. As shown in Figure 2, the method includes:

S201. The base station divides M user equipments into M1 user equipment groups to form user equipment group information, and each user equipment group corresponds to one activation time.

The base station divides the M user equipments into M1 user equipment groups, including:

The base station divides the M user equipments into M1 different subnets according to the variable length subnet mask VLSM, and each subnet corresponds to one user equipment group; wherein each user equipment in the user equipment group Have a unique identifier; or

Specifically, after the foregoing M user equipments are powered on and attached to a Standalone Long Term Evolution Unlicensed (SALTE-U) network, the core network allocates uniqueness to each of the foregoing M user equipments. Internet Protocol (IP) address.

The foregoing base station divides the M user equipments into different subnets according to their IP addresses by using a variable length subnet mask (VLSM), and each subnet corresponds to one user equipment group. The base station sets a user equipment group identifier for each user equipment group, and sets a user equipment identifier for the user equipment in each user equipment group, and the user equipment identifier is unique in the user equipment group.

For example, if the above M is 10, the upper 10 user equipments are respectively numbered as user equipments 1, 2, 3, 4... The correspondence between the 10 user equipments and the IP addresses is as shown in Table 1. It can be seen from Table 1 that the subnet mask corresponding to the IP address of the user equipment 1, 2, 3, 4, 5 is 255.255.255.0, and the subnet mask corresponding to the IP address of the user equipment 6, 7, 8, 9, 10 It is 255.255.255.240, so the above-mentioned base station divides the user equipments 1, 2, 3, 4, and 5 into one group, which is the user equipment group A, and divides the user equipments 6, 7, 8, 9, and 10 into one group, which is a user. In the device group B, the above M1 is 2, that is, the base station divides the ten user equipments into two user equipment groups.

Further, after the foregoing base station divides the M user equipments into M1 user equipment groups, each base station group of the M1 user equipment groups is allocated an activation period. It can be understood that the base station can allocate one activation period to each user equipment group according to the system frame, and the activation periods corresponding to the M1 user equipment groups are continuous but not overlapping each other. It can be understood that the activation period of each user equipment group is periodic.

Table 1

用户设备编号User equipment number	IP地址IP address
用户设备1User equipment 1	192.168.0.1192.168.0.1
用户设备2User equipment 2	192.168.0.2192.168.0.2
用户设备3User equipment 3	192.168.0.3192.168.0.3
用户设备4User equipment 4	192.168.0.4192.168.0.4
用户设备5User equipment 5	192.168.0.5192.168.0.5
用户设备6User equipment 6	192.168.0.241192.168.0.241
用户设备7User equipment 7	192.168.0.242192.168.0.242
用户设备8User equipment 8	192.168.0.243192.168.0.243
用户设备9 User equipment 9	192.168.0.244192.168.0.244
用户设备10User equipment 10	192.168.0.245192.168.0.245

Each user equipment in user equipment group A and user equipment group B has a unique user equipment identifier in the group. For example, the user equipment identifier in the user equipment group A is as shown in Table 2, and the user equipment identifier in the user equipment group B is as shown in Table 3.

Table 2

用户设备编号User equipment number	IP地址IP address	用户设备标识User equipment identification
用户设备1User equipment 1	192.168.0.1192.168.0.1	11001100
用户设备2User equipment 2	192.168.0.2192.168.0.2	10101010
用户设备3User equipment 3	192.168.0.3192.168.0.3	10011001
用户设备4User equipment 4	192.168.0.4192.168.0.4	01100110
用户设备5User equipment 5	192.168.0.5192.168.0.5	01010101

table 3

用户设备编号User equipment number	IP地址IP address	用户设备标识User equipment identification
用户设备6User equipment 6	192.168.0.241192.168.0.241	10011001
用户设备7User equipment 7	192.168.0.242192.168.0.242	01010101
用户设备8User equipment 8	192.168.0.243192.168.0.243	11001100
用户设备9 User equipment 9	192.168.0.244192.168.0.244	01100110
用户设备10User equipment 10	192.168.0.245192.168.0.245	10101010

It should be noted that the foregoing base station may use other methods to group the M user equipments. For example, the International Mobile Subscriber Identification Number (IMSI) of the user equipment.

S202. The base station broadcasts a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band channel.

Specifically, when the base station accesses the unlicensed band channel for the first time in each of the activation periods, the broadcast message is broadcasted to indicate that the user equipment in the activated user equipment group of the M user equipments is accessed. Unlicensed band channel.

The broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, a duration of an activation period of the activated user equipment group, and the user equipment group. The preamble set and the PRACH configuration of the unlicensed band channel accessed by the base station.

The broadcast message includes a first broadcast message and a second broadcast message.

The broadcast message further includes a third broadcast message, and the method further includes:

The base station sends the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or

Specifically, the foregoing base station may simultaneously send the first broadcast message and the second broadcast message on different frequency resources, and after the user equipment parses the first broadcast message, confirm that the user information is not determined according to the user group information in the first broadcast message. If the user activates or is activated and has no data to transmit, the user equipment does not parse the second broadcast message and reduces the power consumption of the user equipment.

The grouping message of the user equipment includes at least one of the following: a VLSM of the user equipment group, an IP address of each user equipment in the user equipment group, and a user equipment in the user equipment group. IMSI, an effective backoff parameter of the user equipment in the user equipment group.

After the base station broadcasts a broadcast message, the method further includes:

For example, suppose the above N1 is 10, and the capacity N of the base station is 6. After the first user equipment sends the first channel access request to the base station, the first channel access request includes a preamble (Preamble). The preamble corresponds to the user equipment one by one. When the base station determines that the number N2 of received preambles is 8, since the number of preambles is greater than the capacity of the base station, that is, the number of user equipments that need to access the unlicensed band channel exceeds the capacity of the base station, The base station randomly selects six user equipments from the eight user equipments corresponding to the eight preambles, and sends a first response message to the six user equipments. At this time, the above N3 is equal to 6. When the base station determines that the number N2 of the received preambles is 5, the number of user equipments that need to access the unlicensed band channel does not exceed the capacity of the base station because the number of preambles is less than the capacity of the base station. Then, the base station sends a first response message from the user equipment corresponding to the five preambles. At this time, the above N3 is equal to 5.

After the sending, by the base station, the first response message to the N3 user equipments, the method includes:

It should be noted that the foregoing PRACH configuration includes a channel identifier, where the channel identifier is used to indicate a corresponding channel.

For example, assume that user equipment A and user equipment B are any two of the N2 user equipments. The above PRACH configuration includes a channel identifier, which is used to indicate a corresponding channel. When the base station detects the user equipment identifier of the user equipment A and the user equipment identity of the user equipment B on one time slot of the channel corresponding to the channel identifier, the base station confirms that there are two according to the user equipment identifier included in the second channel access request. The user contends to use one time slot resource, and the foregoing base station sends the second response message to the user equipment A and the user equipment B respectively, where the second response message is used to notify the user equipment A and the user equipment B to access the authorization. The band channel failed.

For example, if the user equipment A is any one of the N3 user equipments, the base station detects only the user of the user equipment A on a time slot of the channel corresponding to the channel identifier according to the user equipment identifier. When the device identifies that the user equipment contends that only one user equipment contends for the resource of one time slot, the base station sends a second response message to the user equipment A, where the second response message is used to notify the user equipment A to access the The licensed band channel is successful.

It can be seen that, in the solution of the embodiment of the present invention, the base station first groups the user equipment, and allocates the channel access request of the user equipment to the multiple subchannels of the unlicensed band channel according to the user equipment group, thereby reducing the user equipment. The access channel conflict helps to solve the problem that the channel cannot be accessed due to channel conflict.

Referring to FIG. 3, FIG. 3 is a schematic flowchart of another process for random access in an unlicensed band according to an embodiment of the present invention. As shown in FIG. 3, the method includes:

S301. The user equipment receives a broadcast message sent by the base station.

The broadcast message includes a third broadcast message, and the method further includes:

Specifically, after the base station accesses the unlicensed band channel, the base station broadcasts a Discovery Reference Signal (DRS) to notify the user equipment that the base station has accessed the unlicensed band channel. When the base station broadcasts the DRS, the third broadcast message is broadcasted, and the third broadcast message carries the duration T _{L of} the base station accessing the unlicensed band channel, and the third broadcast message is used to notify the user equipment that the base station is connected. Length of time taken into the channel of the unlicensed band T _L

The broadcast message includes a third broadcast message, where the third broadcast message includes a duration T _{L of} the base station accessing the unlicensed band channel, and after the user equipment receives the third broadcast message, The accessing the unlicensed band channel by the user equipment according to the broadcast message specifically includes:

Specifically, the above equivalent continuous channel can be seen in FIG. 4, which is a schematic diagram of an equivalent continuous channel. As shown in FIG. 4, it can be understood that the above-mentioned equivalent continuous channel is a part of the unlicensed band channel. It said user equipment receives the third message to the base station transmitted the broadcast, the base station according to access the broadcast message unlicensed band channel duration T _L, T _L in the time domain on unlicensed bands corresponding to other splice channel Effective continuous channel. As shown in FIG. 5, the equivalent continuous channel includes channel 0, channel 1, channel 2, .... Each of the sub-channels in the lower continuous channel is a duration in which the base station accesses the unlicensed band channel, and the duration is T _L .

Further, the above-mentioned unlicensed band channel can be understood as being in the time domain, and the user equipment removes the duration occupied by the base station (such as the Wireless Fidelity (Wi-Fi) shown in FIG. 4). The channel durations occupied by the base stations are spliced together, are continuous in the time domain, and number the corresponding channels of each segment length as channel identifiers. The channel identifiers are in one-to-one correspondence with the subchannels in the equivalent continuous channel.

S302. The user equipment accesses an unlicensed band channel according to the broadcast message. The broadcast message includes a first broadcast message and a second broadcast message, where the first broadcast message includes user equipment group information, an activation start time of the activated user equipment group, and an activation period of the activated user equipment group. duration,

Specifically, the user equipment determines, according to its IP address or its IMSI, whether the user equipment group to which it belongs is activated; when the user equipment determines that the user equipment group to which it belongs is activated according to its IP address or its IMSI, and the user equipment has data requirements During transmission, the user equipment listens to the second broadcast message within the duration of the activation period of the activated user equipment group from the activation start time of the activated user equipment group, and after detecting the second broadcast message, The user equipment receives the second broadcast message.

When the user equipment determines that the user equipment group to which the user equipment belongs is not activated according to the IP address or its IMSI or determines that the user equipment group is activated but the user data has no data to be transmitted, the user equipment starts the sleep function to enter Sleep state, reducing the power consumption of user equipment.

Optionally, the user equipment receives the first broadcast message and the second broadcast message that are broadcast by the base station, and after the user equipment parses the first broadcast message, determines that the user equipment is not activated according to the user equipment group information in the first broadcast message or If it is activated and there is no data to transmit, the user equipment does not parse the second broadcast message, which can further reduce the power consumption of the user equipment.

Further, the user equipment determines whether the user equipment group to which the user equipment belongs is activated according to its IP address or its IMSI. Specifically, the user equipment determines whether it belongs to the activated user equipment group according to its IP address or its IMSI.

The second broadcast message includes a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station, and the user equipment accessing the unlicensed band channel according to the broadcast message includes:

Specifically, the foregoing PRACH configuration includes a channel identifier, and the user equipment is in consecutive T random access slots starting from the first available random access slot RAS of the subchannel of the equivalent continuous channel indicated by the channel identifier. And selecting one time slot as the transmission time slot, and transmitting the first channel access request through the transmission time slot.

The second broadcast message includes a preamble set of the user equipment group, and the sending, by the user equipment, the first channel access request by using the sending time slot includes:

It should be noted that the foregoing preambles are in one-to-one correspondence with the user equipment, and the preambles in the preamble set of the user equipment group are different from each other.

After the user equipment sends the first channel access request by using the sending time slot, the user equipment accessing the unlicensed frequency band channel according to the broadcast message includes:

The user equipment starts a timer;

For example, if the random access response (RAR) time window of the user equipment is 20 ms, the base station accesses the unlicensed channel and activates the user equipment when the system time is 10 ms, then the user equipment timer starts timing, if the base station The time of the first access channel is 5 ms and the unlicensed channel is exited. Then the user equipment is timed 5 ms and exits the unlicensed band channel. Then, the timer of the user equipment stops counting after 5 ms, until the next time the base station is detected. When entering the license band channel, the user equipment re-accesses the unlicensed band channel and continues to time. By stopping the time when the base station is not connected to the unlicensed band channel, the user equipment is prevented from receiving the first response message in the RAR time window, resulting in retransmission of the first channel access request, that is, retransmission of the preamble of the user equipment.

The above RAR time window is adaptively changed with the length of the channel unavailable time slot.

It should be noted that the preset backoff time is the time indicated by the effective backoff parameter described in step S202. The valid backoff parameter is the number of Random Access Slots (RAS) of the channel accessed by the current user equipment.

After the user equipment sends the second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the user equipment accessing the unlicensed frequency band channel according to the broadcast message includes:

Specifically, after the user equipment sends the second channel access request to the base station, the base station sends a second response message to the user equipment to inform the user whether the device is successfully connected, whether the channel is successfully accessed or not. If the user equipment does not receive the second response message sent by the base station within the preset duration, the user equipment may determine that the base station does not receive the second channel access request that is sent by the user equipment, and the user equipment resends the second channel access request to the base station. Second channel access request.

It can be seen that, in the solution of the embodiment of the present invention, the user equipment determines whether it is activated according to the user equipment grouping information, and when the user equipment determines that it is activated and has data to transmit, the user equipment sends the first channel to the base station. Access request. By grouping the user equipments and then transmitting the access request to the base station according to the user equipment group, the user equipment access channel conflict is reduced; and the user equipment access request is dispersed to multiple time slots of one subchannel, further reducing The user equipment access channel conflicts are beneficial to solve the problem that the channel cannot be accessed due to channel conflict.

Referring to FIG. 4, FIG. 4 is a schematic diagram of an interactive flow of another method for random access of an unlicensed band according to an embodiment of the present invention. As shown in FIG. 4, the method includes:

S501. The base station broadcasts the first broadcast message.

Before the base station broadcasts the first broadcast message, the base station divides the M user equipments into different user equipment groups to form user equipment group information.

It should be noted that, the grouping of the foregoing M user equipments by the foregoing base station may refer to the related description in the foregoing step S201, and details are not described herein again.

In the unlicensed frequency band, the base station accesses the unlicensed band channel by means of Listening Before Talk (LBT), and the base station uses the ON/OFF state to indicate that the base station accesses/not accesses the unlicensed band channel. Each time the base station is in the ON state for a duration of T _L , the duration of each time in the OFF state is a random variable, and the random variable depends on the channel access parameter.

After accessing the unlicensed band channel, the base station broadcasts a DRS to the M user equipments to notify the M user equipment that the base station has accessed the unlicensed band channel, and broadcasts a third broadcast message to inform the user equipment that the base station is The duration T _L of the access-free frequency band, the first broadcast message includes the duration of the base station accessing the unlicensed band channel, that is, the duration T _{L of} the base station in the ON state.

The M user equipments receive the duration T _L of the base station transmitting the unlicensed frequency band of the base station, and splicing the channels corresponding to the duration T _L into an equivalent continuous channel.

It should be noted that the related description of the above-mentioned equivalent continuous channel can be referred to the related description of step S301 above, and details are not described herein again.

The sending, by the base station, the first broadcast message to the user equipment is performed after the base station accesses the unlicensed band channel. The first broadcast message includes a user equipment grouping information, an activation start time of the user equipment group, and a duration of the activation period of the user equipment group.

S502. The N1 user equipments of the M user equipments receive the second broadcast message, and send a first channel access request to the base station.

Specifically, the foregoing M user equipments confirm whether the user equipment is activated according to the IP address of the user equipment or the IMSI of the user equipment and the user equipment group information in the broadcast message. The user equipment group information includes a correspondence between a user equipment group and an activation period. Each of the above M user equipments determines whether it belongs to the user equipment group that is currently activated according to its IP address or the IMSI of the user equipment. If the user equipment determines that it belongs to the user equipment group that is activated at the current time according to its IP address or the IMSI of the user equipment, the user equipment determines that it is activated.

The N1 user equipments are user equipments that are currently activated and have data to be transmitted in the foregoing M user equipments.

If the user equipment determines that it is not activated or confirms that it is activated but has no data to send, the user equipment initiates a sleep function, causing the user equipment to enter a sleep state, reducing power consumption.

The N1 user equipments listen to the second broadcast message of the base station in the duration of the activation period of the user equipment group from the activation start time of the user equipment group, and when the second broadcast message is detected, the N1 user equipments Receiving a second broadcast message, according to the channel identifier in the PRACH configuration included in the second broadcast message, sending, by using the channel identifier of the equivalent continuous channel indicated by the channel identifier, a first channel access request to the base station, where the first channel access The request is for requesting that the user equipment access the channel corresponding to the channel identifier.

Specifically, the foregoing N1 user equipments are in consecutive T random access slots starting from the first available random access slot (RAS) on the subchannel of the unlicensed band channel indicated by the channel identifier. The N1 time slots are randomly selected as the transmission time slot; the N1 user equipments send the first channel access request to the base station by using the transmission time slot.

The first channel access request includes a preamble of the user equipment, and before the user equipment sends the first channel access request to the base station, the user equipment randomly selects from the preamble set of the user equipment in the second broadcast message. A preamble is used as the preamble of the user equipment.

In a feasible embodiment, the user equipment can simultaneously receive the first broadcast message and the second broadcast message sent by the base station; the user parses the first broadcast message, and the user equipment confirms the user equipment group information according to the first broadcast message. When not activated or activated and no data needs to be transmitted, the user equipment does not parse the second broadcast message and initiates a sleep function to enter a sleep state to reduce power consumption of the user equipment.

S503. The base station sends a first response message to the N2 user equipments, where the first response message is used to indicate that the N2 user equipments are allowed to access the channel indicated by the channel identifier.

Specifically, the foregoing first channel access request includes a preamble of the user equipment, and the preamble is in one-to-one correspondence with the user equipment. After the N1 user equipments send the first channel access request to the base station, the base station determines the number N2 of received preambles according to the preamble. When the base station determines whether the number N2 of the preambles is greater than or equal to the capacity N of the base station. When it is determined that the number N2 of the foregoing preambles is greater than or equal to N, the base station randomly selects N user equipments from the user equipments corresponding to the N2 preambles, and sends a first response message to the N3 user equipments, where the N3 is equal to the N When it is determined that the number N2 of the foregoing preambles is smaller than the foregoing N, the base station sends the response message to the N3 user equipments, where the N3 is equal to the foregoing N3.

Further, it is assumed that the user equipment A is any one of the N1 user equipments, and after the user equipment A sends the first channel access request to the base station, the user equipment A starts its timer from the time when the access channel is requested to be sent;

When the base station is not connected to the unlicensed band channel, the timer stops counting; when the base station accesses the unlicensed band channel again, the user equipment A starts the timer to continue counting;

When the user equipment receives the first response message sent by the base station in the counting period of the timer, the user equipment A sends a second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, where the A response message is used to indicate that the user equipment A is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment A.

For example, if the random access response (RAR) time window of the user equipment A is 20 ms, the base station accesses the unlicensed channel and activates the user equipment when the system time is 10 ms, then the user equipment A timer starts counting. If the base station accesses the channel for 5 ms and exits the unlicensed channel for the first time, the user equipment A is timed 5 ms and exits the unlicensed band channel, then the timer of the user equipment A stops counting after 5 ms, until the next time. When detecting that the base station accesses the unlicensed band channel, the user equipment A re-accesses the unlicensed band channel and continues to time. By stopping the time when the base station is not connected to the unlicensed band channel, the user equipment A is prevented from receiving the first response message in the RAR time window, which causes the retransmission of the first channel access request, that is, the preamble of the user equipment A. pass.

It should be noted that the preset backoff time is the time indicated by the effective backoff parameter described in step S202. The above effective backoff parameter is the number of RASs of the channel accessed by the current book device.

S504, after the user equipment N2 long the first response message is received during the counting of the timer, transmitting the uplink resource user equipment N2 via the M subchannels corresponding to the channel identifier of _a second channel access slot Enter the request and start the contention timer.

Incidentally, the above-described sub-channel identification corresponding to the equivalent continuous channel contains M ₁ slot, said second channel access request for requesting access to the above-described sub-channel equivalent continuous channel identification as indicated , N2 above is less than or equal to N1.

The second channel access request includes a user equipment identifier, and the user equipment identifier is in one-to-one correspondence with the user equipment.

S505. The base station sends a second response message to the N4 user equipments, where the second response message is used to notify the N4 user equipments whether to successfully access the subchannel corresponding to the channel identifier.

The N4 user equipments are the user equipments corresponding to the user equipment identifiers in the second channel access request received by the base station in the N2 user equipments.

In particular, if the base station receiving at least two user equipment identifier according to a time slot on either M ₁ time slots. If the at least two user equipment identifiers are received, the second user response message is sent to the at least two user equipment identifiers, and the second response message is used to notify the at least two user equipment identifiers that the user equipments are in competition and access. The unlicensed band channel fails; if only one user equipment identifier is received, the user equipment identifier is sent to the corresponding user equipment to send a second response message, where the second response message is used to notify the user equipment that the user identifier does not compete. The access channel was successful.

Further, after the second channel access request is sent to the base station, the user equipment B does not receive the second response message sent by the base station, and the user equipment B is corresponding to the channel identifier. M ₁ in the subchannel time slots transmitted in any one time slot of the second channel access request, said user equipment to any of the above N4 B a user equipment.

It should be noted that the above N4 is less than or equal to N2.

It can be seen that, in the solution of the embodiment of the present invention, the user equipment determines whether it is activated according to the user equipment grouping information, and when the user equipment determines that it is activated and has data to transmit, the user equipment sends the first channel to the base station. Access request. By grouping the user equipments and then transmitting the access request to the base station according to the user equipment group, the user equipment access channel conflict is reduced; and the user equipment access request is dispersed to multiple time slots of one subchannel, further reducing The user equipment access channel conflicts are beneficial to solve the problem that the channel cannot be accessed due to channel conflict. The base station allocates an activation time and an activation duration to the user equipment according to the group. When the user equipment is activated and data needs to be transmitted, the user equipment listens to and receives the broadcast message within the activation time period from the activation time, and in other cases, the user The device handles the sleep state and reduces the power consumption of the user equipment.

It should be noted that the foregoing first channel access request, first response message, second channel access request, and second response message may be written or understood as MSG1, MSG2, MSG3, and MSG4, respectively.

Referring to FIG. 6, FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station 600 includes:

The grouping module 601 is configured to divide the M user equipments into M1 user equipment groups to form user equipment group information; each user equipment group corresponds to one activation period.

Optionally, the grouping module 601 is specifically configured to:

The first broadcast module 602 is configured to broadcast a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band. channel.

Optionally, the first broadcast module 602 is specifically configured to:

When the base station 600 accesses the unlicensed band channel for the first time in each of the activation periods, the broadcast message is broadcasted to indicate that the user equipment in the activated user equipment group of the M user equipments is not authorized for access. Band channel.

Optionally, the broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, a duration of an activation period of the activated user equipment group, the user The preamble set of the device group and the physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.

Optionally, the broadcast message includes a first broadcast message and a second broadcast message.

Optionally, the broadcast message further includes a third broadcast message, where the base station 600 further includes:

a second broadcast module 603, configured to broadcast a discovery reference signal and a third broadcast message each time the unlicensed band channel is accessed in each of the activation periods, where the discovery reference signal is used to notify the user equipment of the The base station has accessed the unlicensed band channel, and the third broadcast message is used to notify the user equipment of the time length T _L occupied by the base station to access the unlicensed band channel.

Optionally, the base station simultaneously sends the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or

Optionally, the grouping message of the user equipment includes at least one of the following: a VLSM of the user equipment group, an IP address of each user equipment in the user equipment group, and a user in the user equipment group. The IMSI of the device and the effective backoff parameter of the user equipment in the user equipment group.

Optionally, after the first broadcast module broadcasts a broadcast message, the base station 600 further includes:

The first receiving module 604 is configured to receive a first channel access request sent by the N1 user equipments of the activated user equipment, where the channel access request is used to request to allow the N1 user equipments to access the Authorized band channel;

a determining module 605, configured to determine a number N2 of preambles included in the channel access request, where the preamble is in one-to-one correspondence with the user equipment;

The selecting module 606 is configured to: when determining that the number N2 of the preambles is greater than or equal to the capacity N of the base station, randomly selecting N user equipments from user equipments corresponding to the N2 preambles;

The first sending module 607 is configured to send a first response message to the N3 user equipments, where the N3 is equal to the N;

The first sending module 607 is further configured to: when the base station determines that the number N2 of the preambles is smaller than the capacity N of the base station, send a first response message to the N3 user equipments, where the N3 is equal to The first response message is used to indicate that the N3 user equipments are allowed to access the unlicensed band channel.

Optionally, after the first sending module 607 sends the first response message to the N3 user equipments, the base station 600 includes:

The second receiving module 608 is configured to receive a second channel access request sent by the N3 user equipments, where the second request message is used to request access to an unlicensed band channel, and the second channel access request includes a user. Equipment Identity;

a second sending module 609, configured to: when the base station detects at least two user equipment identifiers on one time slot of the indicated channel of the PRACH configuration, according to the user equipment identifier, to the at least two user equipments The user equipment corresponding to the identifier sends a second response message, where the second response message is used to notify that the user equipment corresponding to the at least two user equipment identifiers fails to access the unlicensed band channel;

The second sending module 609 is further configured to: when the base station detects only one user equipment identifier on a time slot of the indicated channel of the PRACH configuration, according to the user equipment identifier, identify the user equipment identifier The corresponding user equipment sends a second response message, where the second response message is used to notify the user equipment that the user equipment is connected to access the unlicensed band channel successfully.

It should be noted that each of the foregoing modules (the grouping module 601, the first broadcast module 602, the second broadcast module 603, the first receiving module 604, the determining module 605, the selecting module 606, the first sending module 607, and the second receiving module 608) The second sending module 609) is configured to perform the related steps of the above method.

In this embodiment, base station 600 is presented in the form of a module. A "module" herein may refer to an application-specific integrated circuit (ASIC), a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that provide the above functionality. . In addition, the foregoing grouping module 601, the first broadcast module 602, the second broadcast module 603, the first receiving module 604, the determining module 605, the selecting module 606, the first sending module 607, the second receiving module 608, and the second sending module 609 This can be achieved by the processor 901 of the base station shown in FIG.

Referring to FIG. 7, FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 7, the base station 700 includes:

The first receiving module 701 is configured to receive a broadcast message sent by the base station.

The access module 702 is configured to access the unlicensed band channel according to the broadcast message.

Optionally, the broadcast message includes a third broadcast message, and the user equipment 700 further includes:

a second receiving module 703, configured to receive a discovery reference signal and a third broadcast message that are broadcast by the base station;

Optionally, the broadcast message includes a first broadcast message and a second broadcast message, where the first broadcast message includes user equipment group information, an activation start time of the activated user equipment group, and activation of the activated user equipment group. The access module 702 includes:

a determining unit 7021, after the first receiving module receives the first broadcast message, confirming whether it is activated according to the user equipment grouping information;

a first receiving unit 7022, configured to: when the user equipment determines that it is activated and its data needs to be transmitted, listen to and receive the second broadcast message within a duration of the activation period from the activation start time .

Optionally, the access module 702 includes:

The initiating unit 7023 is configured to start a sleep function when it is determined according to the user equipment group information that it is activated and there is no data to transmit, or when it is determined that the user group information is not activated according to the user group information.

Optionally, the broadcast message includes a third broadcast message, where the third broadcast message includes a duration T _{L of} the base station accessing the unlicensed band channel, and the user equipment receives the third broadcast message. The access module 702 includes:

The splicing unit 7024 is configured to splice the unlicensed band channels corresponding to the duration T _L into an equivalent continuous channel in the time domain.

Optionally, the second broadcast message includes a physical random access channel PRACH configuration of the unlicensed band channel that the base station accesses, and the access module 702 includes:

The selecting unit 7025 is configured to select one of the consecutive T random access slots starting from the first available random access slot RAS of the subchannel of the equivalent continuous channel according to the PRACH configuration. Gap as a transmission slot;

The first sending unit 7026 is configured to send, by using the sending time slot, a first channel access request, where the first channel access request is used to request the user equipment to access the unlicensed band channel.

Optionally, the second broadcast message includes a preamble set of the user equipment group, and the first sending unit 7026 is specifically configured to:

Optionally, after the first sending unit sends the first channel access request by using the sending time slot, the access module 702 includes:

The timer unit 7027 is configured to start a timer; when the base station does not access the unlicensed band channel, stop timing; when the base station accesses the unlicensed band channel again, the start timer continues to be timed;

The second sending unit 7028 is configured to: when the user equipment receives the first response message sent by the base station in the counting duration of the timer, send, by using the uplink resource indicated by the PRACH configuration, to the base station The second channel access request is used to indicate that the user equipment is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment.

The third sending unit 7029 is configured to resend the first channel access request to the base station after a preset backoff time when the first response message is not received within the duration of the timer counting.

Optionally, after the second sending unit 7028 sends the second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the access module 702 includes:

a second receiving unit 70210, configured to receive a second response message sent by the base station, where the second response message is used to notify the user equipment whether the unlicensed band channel is successfully accessed;

The fourth sending unit 70211 is configured to resend the second channel access request to the base station when the second response message sent by the base station is not received within a preset duration.

It should be noted that each of the foregoing modules (the first receiving module 701, the access module 702, and the second receiving module 703) is configured to perform the related steps of the foregoing method.

In this embodiment, user device 700 is presented in the form of a module. A "module" herein may refer to an application-specific integrated circuit (ASIC), a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that provide the above functionality. . In addition, the above first receiving module 701, access module 702, and second receiving module 703 can be implemented by the processor 1001 of the user equipment shown in FIG.

As shown in FIG. 9, base station 900 can be implemented in the structure of FIG. 9, which includes at least one processor 901, at least one memory 902, and at least one communication interface 903. The processor 901, the memory 902, and the communication interface 903 are connected by the communication bus and complete communication with each other.

The processor 901 can be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the above program.

The communication interface 903 is configured to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), and the like.

The memory 902 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type that can store information and instructions. The dynamic storage device can also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other media accessed, but not limited to this. The memory can exist independently and be connected to the processor via a bus. The memory can also be integrated with the processor.

The memory 902 is configured to store application code that executes the above solution, and is controlled by the processor 901 for execution. The processor 901 is configured to execute application code stored in the memory 902.

The code stored in the memory 902 can perform the foregoing method for performing random access of the unlicensed band performed by the terminal device provided by the foregoing, for example, the base station divides the M user devices into M1 user equipment groups to form user equipment group information; each user equipment group Corresponding to an activation period; the base station broadcasts a broadcast message, and the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band. channel.

As shown in FIG. 10, user equipment 1000 can be implemented in the structure of FIG. 10, which includes at least one processor 1001, at least one memory 1002, and at least one communication interface 1003. The processor 1001, the memory 1002, and the communication interface 1003 are connected by the communication bus and complete communication with each other.

The processor 1001 may be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the above program.

The communication interface 1003 is configured to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), and the like.

The memory 1002 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type that can store information and instructions. The dynamic storage device can also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other media accessed, but not limited to this. The memory can exist independently and be connected to the processor via a bus. The memory can also be integrated with the processor.

The memory 1002 is configured to store application code that executes the above solution, and is controlled by the processor 1001 for execution. The processor 1001 is configured to execute application code stored in the memory 1002.

The code stored in the memory 1002 may perform the above-mentioned unlicensed band random access method performed by the terminal device provided by the terminal device, for example, the user equipment receives a broadcast message sent by the base station; and the user equipment accesses the unlicensed band channel according to the broadcast message.

The embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium may store a program, where the program includes some or all of the methods for random access of the unlicensed band described in the foregoing method embodiments. step.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.

A person skilled in the art can understand that all or part of the steps of the foregoing embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable memory, and the memory can include: a flash drive , read-only memory (English: Read-Only Memory, referred to as: ROM), random accessor (English: Random Access Memory, referred to as: RAM), disk or CD.

The embodiments of the present invention have been described in detail above, and the principles and implementations of the present invention are described in detail herein. The description of the above embodiments is only for helping to understand the method of the present invention and its core ideas; The present invention is not limited by the scope of the present invention, and the present invention is not limited by the scope of the present invention.

Claims

A method for random access in an unlicensed band, characterized in that it comprises:

The base station divides the M user equipments into M1 user equipment groups to form user equipment group information; each user equipment group corresponds to one activation period;

The base station broadcasts a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses the unlicensed frequency band channel.
The method according to claim 1, wherein the broadcasting, by the base station, a broadcast message comprises:

When the base station accesses the unlicensed band channel for the first time in each of the activation periods, the broadcast message is broadcasted to indicate that the user equipment in the activated user equipment group of the M user equipments accesses the unlicensed frequency band. channel.
The method according to claim 2, wherein the broadcast message comprises at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, the activated user equipment group The duration of the activation period, the preamble set of the user equipment group, and the physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.
The method according to claim 2, wherein the broadcast message comprises a first broadcast message and a second broadcast message.

The first broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, and a duration of an activation period of the activated user equipment group;

The second broadcast message includes at least one of the following: a preamble configuration of the user equipment group, and a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.
The method of claim 1, wherein the broadcast message further comprises a third broadcast message, the method further comprising:

The base station broadcasts a discovery reference signal and a third broadcast message each time the base station accesses the unlicensed band channel in the each activation period, where the discovery reference signal is used to notify the user equipment that the base station has been accessed. And the third broadcast message is used to notify the user equipment of the duration T L occupied by the base station to access the unlicensed band channel.
The method according to claim 4 or 5, wherein the base station transmits the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or

The base station sequentially sends the first broadcast message, the second broadcast message, and the third broadcast message on different or the same frequency resources.
The method according to claim 1, wherein the base station divides the M user equipments into M1 user equipment groups, including:

The base station divides the M user equipments into M1 different subnets according to the variable length subnet mask VLSM, and each subnet corresponds to one user equipment group; wherein each user equipment in the user equipment group Have a unique identifier; or

The base station divides the M user equipments into M1 user equipment groups according to an International Mobile Subscriber Identity (IMSI) of the user equipment.
The method according to claim 1, wherein the packet message of the user equipment comprises at least one of the following: a VLSM of the user equipment group, an IP of each user equipment in the user equipment group. The address, the IMSI of the user equipment in the user equipment group, and the effective backoff parameter of the user equipment in the user equipment group.
The method according to claim 1, wherein after the base station broadcasts a broadcast message, the method further includes:

Receiving, by the base station, a first channel access request sent by the N1 user equipments of the activated user equipment, the channel access request is used to request that the N1 user equipments are allowed to access the unlicensed frequency band channel;

Determining, by the base station, the number N2 of preambles included in the channel access request, where the preamble is in one-to-one correspondence with the user equipment;

When determining that the number N2 of the preambles is greater than or equal to the capacity N of the base station, the base station randomly selects N user equipments from user equipments corresponding to the N2 preambles;

The base station sends a first response message to N3 user equipments, where N3 is equal to the N;

When the base station determines that the number N2 of the preamble is smaller than the capacity N of the base station, the base station sends a first response message to the N3 user equipments, where the N3 is equal to the N2;

The first response message is used to indicate that the N3 user equipments are allowed to access the unlicensed band channel.
The method according to claim 9, wherein after the base station sends the first response message to the N3 user equipments, the method includes:

And receiving, by the N3 user equipments, a second channel access request, where the second request message is used to request to access an unlicensed band channel, where the second channel access request includes a user equipment identifier;

When the base station detects at least two user equipment identifiers on one time slot of the indicated channel of the PRACH configuration, the base station identifies the corresponding user to the at least two user equipments. The device sends a second response message, where the second response message is used to notify the at least two user equipments that the corresponding user equipment fails to access the unlicensed band channel;

When the base station detects only one user equipment identifier on one time slot of the indicated channel of the PRACH configuration according to the user equipment identifier, the base station sends a first user equipment to the user equipment corresponding to the one user equipment identifier. And a second response message, where the second response message is used to notify the user equipment that the user equipment is connected to access the unlicensed band channel successfully.
A method for random access in an unlicensed band, characterized in that it comprises:

The user equipment receives the broadcast message sent by the base station;

The user equipment accesses the unlicensed band channel according to the broadcast message.
The method according to claim 11, wherein the broadcast message comprises a third broadcast message, the method further comprising:

Receiving, by the user equipment, a discovery reference signal and a third broadcast message broadcast by the base station;

The discovery reference signal is used to notify the user equipment that the base station has accessed the unlicensed band channel, and the third broadcast message is used to notify the user equipment that the base station accesses the unlicensed band channel. Duration T L .
The method according to claim 11, wherein the broadcast message comprises a first broadcast message and a second broadcast message, the first broadcast message comprising user equipment group information, an activation start time of the activated user equipment group The duration of the activation period of the activated user equipment group,

The user equipment accessing the unlicensed band channel according to the broadcast message includes:

After receiving the first broadcast message, the user equipment confirms whether it is activated according to the user equipment grouping information;

When the user equipment determines that it is activated and its data needs to be transmitted, the user equipment listens to and receives the second broadcast message within the duration of the activation period from the activation start time.
The method according to claim 13, wherein the user equipment accessing the unlicensed band channel according to the broadcast message comprises:

The user equipment initiates a sleep function when it determines that it is activated according to the user equipment grouping information and that it has no data to transmit, or determines that it is not activated according to the user grouping information.
The method according to claim 13, wherein the broadcast message comprises a third broadcast message, and the third broadcast message comprises a duration T L of the base station accessing the unlicensed band channel at the time, the user equipment After receiving the third broadcast message, the user equipment accessing the unlicensed band channel according to the broadcast message specifically includes:

The user equipment splices the unlicensed band channels corresponding to the duration T L into an equivalent continuous channel in the time domain.
The method according to claim 15, wherein the second broadcast message comprises a physical random access channel PRACH configuration of the band-free channel accessed by the base station, and the user equipment accesses according to the broadcast message. Unlicensed band channels include:

The user equipment randomly selects one time slot from consecutive T random access slots starting from the first available random access slot RAS of the subchannel of the equivalent continuous channel according to the PRACH configuration. Transmitting time slot

The user equipment sends a first channel access request by using the sending time slot, where the first channel access request is used to request that the user equipment be allowed to access an unlicensed band channel.
The method according to claim 16, wherein the second broadcast message comprises a preamble set of the user equipment group, and the user equipment sending the first channel access request by using the sending time slot comprises:

The user equipment randomly selects a preamble from a preamble set of the user equipment group;

The user equipment sends the first channel access request carrying the selected preamble through the sending time slot.
The method according to claim 16, wherein after the user equipment sends the first channel access request by using the sending time slot, the user equipment accessing the unlicensed band channel according to the broadcast message includes:

The user equipment starts a timer;

When the base station is not connected to the unlicensed band channel, the timer stops counting; when the base station accesses the unlicensed band channel again, the user equipment starts the timer to continue counting;

When the user equipment receives the first response message sent by the base station in the counting duration of the timer, the user equipment sends the second channel access to the base station by using the uplink resource indicated by the PRACH configuration. The first response message is used to indicate that the user equipment is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment.
The method according to claim 18, wherein after the user equipment sends the first channel access request by using the sending time slot, the user equipment accessing the unlicensed band channel according to the broadcast message includes:

When the first response message is not received within the duration of the timer count, the user equipment resends the first channel access request to the base station after a preset backoff time.
The method according to claim 18, after the user equipment sends a second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the user equipment accesses the unlicensed frequency band according to the broadcast message. The channel includes:

Receiving, by the user equipment, a second response message sent by the base station, where the second response message is used to notify the user equipment whether the unlicensed band channel is successfully accessed;

When the second response message sent by the base station is not received within the preset duration, the user equipment resends the second channel access request to the base station.
A base station, comprising:

a grouping module, configured to divide M user equipments into M1 user equipment groups to form user equipment grouping information; each user equipment group corresponds to one activation period;

a first broadcast module, configured to broadcast a broadcast message, where the broadcast message is used to activate a user equipment group corresponding to an activation period in which the base station is currently located, to indicate that the user equipment in the user equipment group accesses an unlicensed frequency band channel .
The base station according to claim 21, wherein the first broadcast module is specifically configured to:

When the base station accesses the unlicensed band channel for the first time in each of the activation periods, the broadcast message is broadcasted to indicate that the user equipment in the activated user equipment group of the M user equipments accesses the unlicensed frequency band. channel.
The base station according to claim 22, wherein the broadcast message comprises at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, the activated user equipment group The duration of the activation period, the preamble set of the user equipment group, and the physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.
The base station according to claim 22, wherein the broadcast message comprises a first broadcast message and a second broadcast message.

The first broadcast message includes at least one of the following: the user equipment group information, an activation start time of the activated user equipment group, and a duration of an activation period of the activated user equipment group;

The second broadcast message includes at least one of the following: a preamble configuration of the user equipment group, and a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station.
The base station according to claim 21, wherein the broadcast message further includes a third broadcast message, the base station further comprising:

a second broadcast module, configured to broadcast a discovery reference signal and a third broadcast message each time the unlicensed band channel is accessed in each of the activation periods, where the discovery reference signal is used to notify the user equipment of the base station The third broadcast message is used to notify the user equipment of the duration T L occupied by the base station for accessing the unlicensed band channel.
The base station according to claim 24 or 25, wherein the base station simultaneously transmits the first broadcast message, the second broadcast message, and the third broadcast message on different frequency resources; or the base station is different or The first broadcast message, the second broadcast message, and the third broadcast message are sequentially sent on the same frequency resource.
The base station according to claim 21, wherein the grouping module is specifically configured to:

According to the variable length subnet mask VLSM, the M user equipments are divided into N different subnets according to the IP address, and each subnet corresponds to one user equipment group; wherein each user equipment in the user equipment group has a unique identifier ;or

The M user equipments are divided into M1 user equipment groups according to the International Mobile Subscriber Identity (IMSI) of the user equipment.
The base station according to claim 21, wherein the packet message of the user equipment comprises at least one of the following: a VLSM of the user equipment group, an IP of each user equipment in the user equipment group. The address, the IMSI of the user equipment in the user equipment group, and the effective backoff parameter of the user equipment in the user equipment group.
The base station according to claim 21, wherein after the first broadcast module broadcasts a broadcast message, the base station further includes:

a first receiving module, configured to receive a first channel access request sent by the N1 user equipments of the activated user equipment, where the channel access request is used to request to allow the N1 user equipments to access the exemption Band channel

a determining module, configured to determine a number N2 of preambles included in the channel access request, where the preamble is in one-to-one correspondence with the user equipment;

The selecting module is configured to: when determining that the number N2 of the preambles is greater than or equal to the capacity N of the base station, randomly selecting N user equipments from user equipments corresponding to the N2 preambles;

a first sending module, configured to send a first response message to the N3 user equipment, where the N3 is equal to the N;

The first sending module is further configured to: when the base station determines that the number N2 of the preambles is smaller than the capacity N of the base station, send a first response message to the N3 user equipments, where the N3 is equal to the N2;

The first response message is used to indicate that the N3 user equipments are allowed to access the unlicensed band channel.
The base station according to claim 29, wherein after the first sending module sends the first response message to the N3 user equipments, the base station includes:

a second receiving module, configured to receive a second channel access request sent by the N3 user equipment, where the second request message is used to request access to an unlicensed band channel, and the second channel access request includes a user equipment Identification

a second sending module, configured to: when the base station detects at least two user equipment identifiers on a time slot of the indicated channel of the PRACH configuration, according to the user equipment identifier, to identify the at least two user equipments The corresponding user equipment sends a second response message, where the second response message is used to notify that the user equipment corresponding to the at least two user equipment identifiers fails to access the unlicensed band channel;

The second sending module is further configured to: when the base station detects only one user equipment identifier on one time slot of the indicated channel configured by the PRACH according to the user equipment identifier, corresponding to the one user equipment identifier The user equipment sends a second response message, where the second response message is used to notify the user equipment that the corresponding user equipment accesses the unlicensed band channel successfully.
A user equipment, comprising:

a first receiving module, configured to receive a broadcast message sent by the base station;

And an access module, configured to access the unlicensed band channel according to the broadcast message.
The user equipment according to claim 31, wherein the broadcast message comprises a third broadcast message, and the user equipment further comprises:

a second receiving module, configured to receive a discovery reference signal and a third broadcast message broadcast by the base station;

The discovery reference signal is used to notify the user equipment that the base station has accessed the unlicensed band channel, and the third broadcast message is used to notify the user equipment that the base station accesses the unlicensed band channel. Duration T L .
The user equipment according to claim 31, wherein the broadcast message comprises a first broadcast message and a second broadcast message, the first broadcast message comprising user equipment group information, activation of an activated user equipment group The time period, the duration of the activation period of the activated user equipment group, the access module includes:

a determining unit, after the first receiving module receives the first broadcast message, confirming whether it is activated according to the user equipment grouping information;

And a first receiving unit, configured to: when the user equipment determines that it is activated and its data needs to be transmitted, listens to and receives the second broadcast message within a duration of the activation period from the activation start time.
The user equipment according to claim 33, wherein the access module comprises:

The first initiating unit is configured to start a sleep function when it is determined that the user equipment grouping information is activated according to the user equipment grouping information and there is no data to be transmitted, or when it is determined that the user equipment group information is not activated according to the user grouping information.
The user equipment according to claim 33, wherein the broadcast message comprises a third broadcast message, and the third broadcast message comprises a duration T L of the base station accessing the unlicensed band channel at the time, the user After the device receives the third broadcast message, the access module includes:

And a splicing unit, configured to splice the unlicensed band channels corresponding to the duration T L into an equivalent continuous channel in the time domain.
The user equipment according to claim 35, wherein the second broadcast message comprises a physical random access channel PRACH configuration of the unlicensed band channel accessed by the base station, and the access module comprises:

a selecting unit, configured to arbitrarily select one time slot from consecutive T random access slots starting from a first available random access slot RAS of the subchannel of the equivalent continuous channel according to the PRACH configuration As a transmission slot;

And a first sending unit, configured to send, by using the sending time slot, a first channel access request, where the first channel access request is used to request that the user equipment be allowed to access an unlicensed band channel.
The user equipment according to claim 36, wherein the second broadcast message comprises a preamble set of the user equipment group, and the first sending unit is specifically configured to:

Selecting a preamble randomly from a set of preambles of the user equipment group;

Transmitting, by the transmission slot, the first channel access request carrying the selected preamble.
The user equipment according to claim 36, wherein after the first sending unit sends the first channel access request by using the sending time slot, the access module includes:

a second timer unit, configured to start a timer; when the base station does not access the unlicensed band channel, stop timing; when the base station accesses the unlicensed band channel again, the start timer continues to count;

a second sending unit, configured to: when the user equipment receives the first response message sent by the base station in the counting duration of the timer, send the second resource to the base station by using the uplink resource indicated by the PRACH configuration a channel access request, the first response message is used to indicate that the user equipment is allowed to access the unlicensed band channel, and the second channel access request carries the user equipment identifier of the user equipment.
The user equipment according to claim 38, wherein after the first sending unit sends the first channel access request by using the sending time slot, the access module includes:

The third sending unit is configured to resend the first channel access request to the base station after a preset backoff time when the first response message is not received within the duration of the timer counting.
The user equipment according to claim 38, after the second sending unit sends a second channel access request to the base station by using the uplink resource indicated by the PRACH configuration, the access module includes:

a second receiving unit, configured to receive a second response message sent by the base station, where the second response message is used to notify the user equipment whether the unlicensed band channel is successfully accessed;

And a fourth sending unit, configured to resend the second channel access request to the base station when the second response message sent by the base station is not received within a preset duration.
A base station, comprising: a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor executing the computer program as claimed in claims 1 to 10 Any of the methods described.
A terminal, comprising: a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor executing the computer program as claimed in claims 11 to 20 Any of the methods described.
A computer readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the method of any one of claims 1 to 20.