CN108605341B

CN108605341B - Uplink channel access method and related equipment

Info

Publication number: CN108605341B
Application number: CN201680081376.7A
Authority: CN
Inventors: 李晓翠; 徐凯
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2021-03-23
Anticipated expiration: 2036-03-31
Also published as: WO2017166162A1; RU2696220C1; CN108605341A

Abstract

The embodiment of the invention provides an uplink channel access method and user equipment, which are used for solving the problem of uplink channel access in an LAA system, and the method is applied to an authorization auxiliary access LAA system and comprises the following steps: user Equipment (UE) receives an uplink data scheduling mode sent by a base station, wherein the uplink data scheduling mode comprises cross-carrier scheduling and self-scheduling; when the uplink data scheduling mode is a cross-carrier scheduling mode, the UE accesses the uplink channel through a first mode, wherein the first mode comprises a first parameter, and the first parameter is an uplink channel access parameter configured for the UE by the base station; and when the uplink data scheduling mode is a self-scheduling mode, the UE accesses the uplink channel through a second mode, wherein the second mode is an LBT mode without a random backoff mechanism.

Description

Uplink channel access method and related equipment

Technical Field

The present invention relates to the field of communications, and in particular, to an uplink channel access method and related devices.

Background

The spectrum used by a wireless communication system is divided into licensed spectrum (licensed spectrum) and unlicensed spectrum (unlicensed spectrum). For a commercial mobile communication system, an operator needs to auction authorized spectrum, and only authorized devices can use the corresponding spectrum to perform mobile communication operation activities. Unlicensed spectrum does not require auctioning and any device may legitimately use these bands, such as wireless fidelity (Wi-Fi) devices in the 2.4GHz and 5GHz bands.

In an authorized-Assisted Access (LAA) system, a node of the LAA uses channel resources by saying a listen-before-talk principle (LBT), wherein LBT is a Carrier Sense Multiple Access (CSMA) technique.

At present, in an LAA system, only a downlink channel access scheme is defined, and an uplink channel access scheme is not defined, so that the problem of uplink channel access cannot be solved.

Disclosure of Invention

The embodiment of the invention provides an uplink channel access method and related equipment, which are used for solving the problem of uplink channel access in an LAA system.

A first aspect provides an uplink channel access method, which is applied to an licensed-assisted access LAA system, and includes: user Equipment (User Equipment, UE) receives an uplink data scheduling mode sent by a base station, wherein the uplink data scheduling mode comprises cross-carrier scheduling and/or self-scheduling; when the uplink data scheduling mode is a cross-carrier scheduling mode, the UE accesses the uplink channel through a first mode, wherein the first mode comprises a first parameter, and the first parameter is an access parameter set by the base station for the uplink channel configured by the UE; and when the uplink data scheduling mode is self-scheduling, the UE accesses the uplink channel through a second mode, wherein the second mode is a Listen Before Talk (LBT) mode without a random backoff mechanism.

Therefore, when the uplink data scheduling mode determined by the base station is cross-carrier scheduling, the UE accesses the uplink channel through the first mode, and when the uplink data scheduling mode determined by the base station is self-scheduling, the UE accesses the uplink channel through the second mode, so that the problem of uplink channel access in an LAA system is solved. The first parameter included in the first mode is an uplink channel access parameter configured for the UE by the base station, and is not configured by the UE itself, so that it can be ensured that multiple UEs access the uplink channel at the same time as much as possible, thereby improving the utilization rate of the uplink channel and effectively utilizing communication resources.

In some possible implementations, the first parameter includes a random backoff counter and/or a contention window size, where a value of the random backoff counter and/or the contention window size is configured by the base station. Namely: the values of the random backoff counter and the contention window size are all configured by the base station in a unified way.

In other possible implementations, the random backoff counter is configured by the base station through Radio Resource Control (RRC), where the RRC includes configuration information of the random backoff count; or the random backoff counter is configured by the base station through a Physical Downlink Control Channel (PDCCH), where the PDCCH includes first bit information used for indicating configuration information of the random backoff counter.

In other possible implementations, the contention window size is configured by the base station through an RRC, where the RRC includes configuration information of the contention window size; or the contention window size is configured by the base station through a PDCCH, where the PDCCH includes second bit information used to indicate configuration information of the contention window size.

Therefore, the values of the random backoff counter and the size of the contention window are uniformly configured by the base station, and a plurality of UEs can be ensured to be simultaneously accessed to the uplink channel as much as possible, so that the utilization rate of the uplink channel is improved, and communication resources are effectively utilized. In practical applications, the base station may perform semi-static configuration on the size of the random backoff counter and/or the contention window through RRC, or the base station may perform dynamic configuration on the size of the random backoff counter and/or the contention window through PDCCH, which is not specifically limited herein.

In other possible implementations, the accessing, by the UE through the first mode, the uplink channel includes: the UE carries out channel detection on the uplink channel; when the UE detects that the uplink channel is idle, accessing the uplink channel; when the UE detects that the uplink channel is occupied, performing random backoff, that is: acquiring the value N (N is an integer larger than 0) of a random backoff counter configured by a base station, subtracting 1 from the value of the random backoff counter every time an idle time slot is detected, detecting the delay time (defer duration) of an uplink channel after subtracting 0 from N, and accessing the uplink channel when the defer duration is idle.

It can be seen that, when the uplink data scheduling mode determined by the base station is cross-carrier scheduling, before the UE accesses the uplink channel, the UE first detects the uplink channel, and when the UE detects that the uplink channel is idle, the UE accesses the uplink channel and sends the uplink data to the base station through the uplink channel, and when the UE detects that the uplink channel is occupied, the UE does not directly access the uplink channel, but accesses the uplink channel after performing a random backoff mechanism, thereby preventing the UE from being unable to normally send the uplink data to the base station through the uplink channel when the uplink channel is occupied.

In other possible implementations, the accessing, by the UE, the uplink channel through the second mode includes: the UE detects the uplink channel; and when the UE detects that the idle time corresponding to the uplink channel is greater than a first threshold value, accessing the uplink channel, wherein the first threshold value is configured by the base station.

Therefore, when the uplink data sent by the base station to the UE is scheduled in a self-scheduling manner, only the uplink channel needs to be detected, and the operation is simple. When the UE detects that the idle time corresponding to the uplink channel is greater than a first threshold, the UE ends the detection of the uplink channel, accesses the uplink channel, and sends the uplink data to the base station through the uplink channel, where the first threshold is configured by the base station according to an actual situation, for example: the first threshold is 25 μ s, and is not particularly limited herein.

A second aspect provides an uplink channel access method, which is applied to an licensed-assisted access LAA system, and includes: a base station determines an uplink data scheduling mode, wherein the uplink data scheduling mode comprises cross-carrier scheduling and/or self-scheduling; the base station sends the determined uplink data scheduling mode to User Equipment (UE), wherein when the base station determines that the uplink data scheduling mode is the cross-carrier scheduling mode, the UE accesses the uplink channel in a first mode, the first mode comprises a first parameter, and the first parameter is an uplink channel access parameter configured for the UE by the base station; when the base station determines that the uplink data scheduling mode is the self-scheduling mode, the UE accesses the uplink channel through a second mode, wherein the second mode is a listen before talk LBT mode without a random backoff mechanism.

Therefore, the base station firstly determines the uplink data scheduling mode and sends the corresponding uplink data scheduling mode to the UE, so that the UE selects the corresponding uplink data scheduling mode to access the uplink channel and sends the uplink data to the base station, and the problem of uplink channel access in an LAA system is solved.

In some possible implementations, the first parameter includes a random backoff counter and/or a contention window size, where a value of the random backoff counter and/or the contention window size is configured by the base station.

In other possible implementations, the random backoff counter is configured by the base station through a radio resource control RRC, where the RRC includes configuration information of the random backoff count;

or the random backoff counter is configured by the base station through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH comprises first bit information used for indicating configuration information of the random backoff counter.

Therefore, the sizes of the random backoff counter and the contention window are uniformly configured through the base station, and a plurality of UEs can be ensured to be simultaneously accessed to the channel as much as possible, so that the utilization rate of an uplink channel is improved, and communication resources are effectively utilized. In practical application, the base station may perform semi-static configuration on the size of the random backoff counter and the contention window through RRC, or the base station may perform dynamic configuration on the size of the random backoff counter and the contention window through PDCCH, which is not specifically limited herein.

A third aspect provides a UE, configured to authorize assisted access to an LAA system, the UE comprising: a receiving module, configured to receive an uplink data scheduling mode sent by a base station, where the uplink data scheduling mode includes cross-carrier scheduling and/or self-scheduling; a first access module, configured to access the uplink channel in a first manner when the uplink data scheduling manner is cross-carrier scheduling, where the first manner includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE; a second accessing module, configured to access the uplink channel in a second mode when the uplink data scheduling mode is self-scheduling, where the second mode is a listen before talk LBT mode without a random backoff mechanism.

It can be seen that, when the receiving module receives that the uplink data scheduling mode sent by the base station to the UE is cross-carrier scheduling, the first access module accesses the uplink channel through the first mode, and when the receiving module receives that the uplink data scheduling mode sent by the base station to the UE is self-scheduling, the second access module accesses the uplink channel through the second mode, thereby solving the uplink channel access problem in the LAA system. The first parameter included in the first mode is an uplink channel access parameter configured for the UE by the base station, and is not configured by the UE itself, so that it can be ensured that multiple UEs access the uplink channel at the same time as much as possible, thereby improving the utilization rate of the uplink channel and effectively utilizing communication resources.

In other possible implementations, the contention window size is configured by the base station through an RRC, where the RRC includes configuration information of the contention window size;

or the contention window size is configured by the base station through a PDCCH, where the PDCCH includes second bit information used to indicate configuration information of the contention window size.

In some other possible implementations, the first access module is specifically configured to perform channel detection on the uplink channel; when the uplink channel is detected to be idle, accessing the uplink channel; when detecting that the uplink channel is occupied, performing random backoff, namely: acquiring the N value (N is an integer larger than 0) of a random backoff counter configured by a base station, subtracting 1 from the value of the random backoff counter every time an idle time slot is detected, detecting the defer duration of an uplink channel after subtracting 0 from N, and accessing the uplink channel when the defer duration is idle.

It can be seen that, when the uplink data scheduling mode sent by the base station to the UE is cross-carrier scheduling, before the UE accesses the uplink channel, the UE first detects the uplink channel, when the UE detects that the uplink channel is idle, the UE accesses the uplink channel and sends the uplink data to the base station through the uplink channel, and when the UE detects that the uplink channel is occupied, the UE does not directly access the uplink channel but accesses the uplink channel after performing random backoff, thereby preventing the UE from being unable to normally send the uplink data to the base station through the uplink channel when the uplink channel is occupied.

In some other possible implementation manners, the second access module is specifically configured to detect the uplink channel; and when detecting that the idle time corresponding to the uplink channel is greater than a first threshold value, accessing the uplink channel, wherein the first threshold value is configured by the base station.

Therefore, when the receiving module receives the uplink data sent by the base station in a self-scheduling mode, the second access module only needs to detect the uplink channel, and the operation is simple. When detecting that the idle time corresponding to the uplink channel is greater than a first threshold, ending the detection of the uplink channel, directly accessing the uplink channel, and sending the uplink data to the base station through the uplink channel, where the first threshold is configured by the base station according to an actual situation, for example: the first threshold is 25 μ s, and is not particularly limited herein.

A fourth aspect provides a base station, which is applied to an licensed assisted access LAA system, and includes: a determining module, configured to determine an uplink data scheduling manner, where the uplink data scheduling manner includes cross-carrier scheduling and/or self-scheduling; a sending module, configured to send the uplink data scheduling manner determined by the determining module to a user equipment UE, where when the base station determines that the uplink data scheduling manner is the cross-carrier scheduling, the UE accesses the uplink channel in a first manner, where the first manner includes a first parameter, the first parameter is an uplink channel access parameter configured by the base station for the UE, and when the base station determines that the uplink data scheduling manner is the self-scheduling, the UE accesses the uplink channel in a second manner, where the second manner is an LBT manner without a random backoff mechanism.

Therefore, the base station firstly determines the uplink data scheduling mode for scheduling the uplink data for the UE and sends the corresponding uplink data scheduling mode to the UE, so that the UE selects the corresponding uplink data scheduling mode to access the uplink channel and sends the uplink data to the base station, and the problem of uplink channel access in an LAA system is solved.

A fifth aspect provides a UE, comprising: one or more processors, a memory, a bus system, and a transceiver, the processors, the memory, and the transceiver being connected by the bus system; wherein the memory stores one or more programs comprising instructions which, when executed by the UE, cause the UE to perform the method as described in the first aspect or any one of the possible implementations of the first aspect.

Therefore, when the uplink data scheduling mode sent by the base station to the UE is cross-carrier scheduling, the UE accesses the uplink channel through the first mode, and when the uplink data scheduling mode sent by the base station to the UE is self-scheduling, the UE accesses the uplink channel through the second mode, so that the problem of uplink channel access in an LAA system is solved. The first parameter included in the first mode is an uplink channel access parameter configured for the UE by the base station, and is not configured by the UE itself, so that the multiple UEs can be ensured to access the channel at the same time as much as possible, thereby improving the utilization rate of the uplink channel and effectively utilizing communication resources.

Drawings

FIG. 1 is a schematic diagram of a LAA system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a UE according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an embodiment of an uplink channel access method in an embodiment of the present invention;

FIG. 4a is a diagram of an embodiment of cross-carrier scheduling of a UE according to the embodiment of the present invention;

FIG. 4b is a diagram of an embodiment of UE self-scheduling in an embodiment of the present invention;

FIG. 5 is a schematic diagram of another structure of a UE according to an embodiment of the present invention;

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

fig. 7 is another structural diagram of a UE in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical scheme of the invention is applied to an LAA system, wherein the LAA system comprises UE and a base station, as shown in figure 1, the base station transmits downlink data to the UE, and the UE transmits uplink data to the base station. Taking UE as an example, as shown in fig. 2, the UE200 includes a communication unit 201, an input unit 202, an output unit 203, a processor 204, a storage unit 205, and a peripheral interface 206, and each unit is connected through one or more buses.

Specifically, the communication unit 201 is configured to establish a communication channel so that the UE connects to a remote server through the communication channel and downloads media data from the remote server. The communication unit may include a Wireless Local Area Network (wlan) module, a bluetooth module, an NFC module, a baseband (Base Band) module, and other communication modules, and a Radio Frequency (RF) circuit corresponding to the communication module, and is configured to perform wlan communication, bluetooth communication, NFC communication, infrared communication, and/or cellular communication system communication, such as Wideband Code Division Multiple Access (W-CDMA) and/or High Speed Downlink Packet Access (HSDPA). The communication module is used for controlling communication of each component in the UE and can support Direct Memory Access (English full name: Direct Memory Access).

The input unit 202 is used for receiving and transmitting signals during information transceiving or a call. For example, after receiving the downlink information of the base station, the downlink information is processed by the processor 204; in addition, the data for designing uplink is transmitted to the base station. For example: after receiving the information sent by the external device, the information is sent to the processor 204 for processing, and the processing result is sent to the external device. Generally, the input unit 202 includes well-known circuitry for performing these functions, including but not limited to an antenna system, a radio frequency transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a Codec (Codec) chipset, a Subscriber Identity Module (SIM) card, memory, and so forth. In addition, the input unit 202 can also communicate with a network and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), e-mail, Short Message Service (SMS), etc.

The output unit 203 includes, but is not limited to, an image output unit and a sound output unit. The image output unit is used for outputting characters, pictures and/or videos. The image output unit may include a Display panel, such as a Display panel configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), a Field Emission Display (FED), and the like. Alternatively, the image output unit may include a reflective display, such as an electrophoretic (electrophoretic) display, or a display using an Interferometric Modulation of Light (Interferometric Modulation). The image output unit may include a single display or a plurality of displays of different sizes. In an embodiment of the present invention, the touch panel used by the input unit 202 can also be used as the display panel of the output unit 203. For example, when the touch panel detects a gesture operation of touch or proximity thereon, the gesture operation is transmitted to the processing unit to determine the type of the touch event, and then the processing unit provides a corresponding visual output on the display panel according to the type of the touch event. Although in fig. 2, the input unit 202 and the output unit 203 are two independent components to implement the input and output functions of the UE, in some embodiments, the touch panel may be integrated with the display panel to implement the input and output functions of the UE. For example, the image output unit may display various Graphical User Interfaces (GUI) as virtual control elements including, but not limited to, windows, scroll bars, icons, and scrapbooks for a User to operate in a touch manner. In one embodiment, the image output unit includes a filter and an amplifier for filtering and amplifying the video output from the processor 204. The audio output unit includes a digital-to-analog converter for converting the audio signal output by the processor 204 from a digital format to an analog format.

The storage unit 205 may be used to store software programs and modules, and the processor 204 executes various functional applications of the UE and implements data processing by running the software programs and modules stored in the storage unit. The storage unit mainly comprises a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function, such as a sound playing program, an image playing program and the like; the data storage area may store data (such as audio data, a phonebook, etc.) created according to the use of the UE, and the like. In an embodiment of the invention, the Memory unit 205 may include a volatile Memory, such as a non-volatile dynamic Random Access Memory (NVRAM), a Phase Change Random Access Memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and a non-volatile Memory, such as at least one magnetic disk Memory device, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a flash Memory device, such as a flash Memory (NOR) or a flash Memory (NAND). The non-volatile memory stores an operating system, an application program, and the like executed by the processing unit. The processor 204 loads operating programs and data from the non-volatile memory into memory and stores digital content in mass storage devices. The operating system includes various components and/or drivers for controlling and managing conventional system tasks, such as memory management, storage device control, power management, etc., as well as facilitating communication between various hardware and software components. In the embodiment of the present invention, the operating system may be an Android system developed by Google, an iOS system developed by Apple, a Windows operating system developed by Microsoft, or an embedded operating system such as Vxworks. The application programs include any application installed on the UE including, but not limited to, browser, email, instant messaging service, word processing, keyboard virtualization, Widget (Widget), encryption, digital rights management, voice recognition, voice replication, location (e.g., functions provided by the global positioning system), music playing, and so forth.

It will be understood by those skilled in the art that the structure of the UE shown in fig. 2 is not intended to limit the present invention, and may be a bus structure, a star structure, a structure including more or less components than those shown, a combination of certain components, or a different arrangement of components. The UE in the embodiments of the present invention includes, but is not limited to, a mobile phone, a mobile computer, a tablet computer, a Personal Digital Assistant (abbreviated as PDA), a media player, a smart tv, a wearable device (e.g., a smart watch or smart glasses), a combination of two or more of the foregoing, and the like.

Before the embodiments of the present invention are introduced, a scenario to which the technical solution of the present invention is applied is introduced, in the third Generation partnership Project (3 rd Generation Partner Project, abbreviation: 3GPP) rel.13, downlink communication of LAA is mainly studied, and currently eLAA of rel.14 mainly studies uplink communication of LAA, and mainly includes a channel access method, a channel design, a reference channel design, and the like. In the LAA topic of 3GPP rel.13, four downlink channel access schemes are defined. The first one is: the LBT is not carried out, and the transmission is directly carried out according to a certain rule; the second is LBT without a random backoff mechanism; the third is LBT with a random back-off mechanism and the same contention window size; the fourth is LBT with random back-off mechanism and varying contention window size. However, for uplink channel access of LAA, no relevant channel access scheme is defined. In the invention, aiming at two different scheduling modes (namely cross-carrier scheduling and self-scheduling) in the LAA system, a related uplink channel access mechanism and scheme are defined, thereby solving the access problem of the uplink channel.

Referring to fig. 3, an embodiment of an uplink channel access method according to an embodiment of the present invention is shown, where the method is applied to an assisted-grant access LAA system, and a specific flow of the embodiment of the method is as follows:

step 301, the base station determines an uplink data scheduling mode, wherein the uplink data scheduling mode includes cross-carrier scheduling and/or self-scheduling.

In the LAA system, there are generally two uplink data scheduling manners determined by the base station, that is: cross carrier scheduling and self-scheduling, wherein the self-scheduling refers to scheduling the uplink data of the local carrier by the downlink control information of the local carrier, and the cross carrier scheduling refers to scheduling the uplink data of other carriers by the downlink control information of the local carrier.

Step 302, the base station sends the determined uplink data scheduling mode to User Equipment (UE).

It can be seen that, a base station sends a determined cross-carrier scheduling and/or self-scheduling mode to a UE, wherein when the base station determines that the uplink data scheduling mode is the cross-carrier scheduling, the UE accesses an uplink channel through a first mode, the first mode includes a first parameter, the first parameter is an uplink channel access parameter configured by the base station for the UE, and when the base station determines that the uplink data scheduling mode is the self-scheduling, the UE accesses the uplink channel through a second mode, wherein the second mode is a listen-before-talk LBT mode without a random backoff mechanism.

Step 303, the UE receives the uplink data scheduling mode sent by the base station.

The UE receives an uplink data scheduling mode sent by the base station, that is: cross-carrier scheduling and/or self-scheduling.

And 304, when the uplink data scheduling mode is cross-carrier scheduling, the UE accesses the uplink channel through a first mode.

In practical application, as shown in fig. 4a, for cross-carrier scheduling, since the UL-grant scheduling information is sent to the UE by the base station through other carriers, the UE needs to use the first method to preempt the uplink channel to ensure that the UE has fair access to the uplink channel with other nodes, if the UE does not know the channel state of the unlicensed carrier for sending uplink data.

The first mode includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE. The first parameter includes a random backoff counter and/or a contention window size, wherein a value of the random backoff counter and/or the contention window size is configured by the base station.

In some possible implementations, the accessing, by the UE, the uplink channel through the first mode includes: the UE carries out channel detection on the uplink channel, and when the UE detects that the uplink channel is occupied, the UE carries out random backoff, namely: acquiring the N value (N is an integer larger than 0) of a random backoff counter configured by a base station, subtracting 1 from the value of the random backoff counter every time an idle time slot is detected, detecting the defer duration of an uplink channel after subtracting 0 from N, and accessing the uplink channel when the defer duration is idle.

In the first mode, the Contention Window Size (CWS) and the random back-off counter are configurable parameters, which are determined by the base station when the base station performs downlink LBT, but in the embodiment of the present invention, the parameters are not determined by the UE during uplink LBT and are configured by the base station. When a plurality of UEs perform multiplex transmission (multiplex), the base station configures the CWS and random back-off counter values of all the scheduled UEs uniformly, so as to ensure that all the scheduled UEs can access the uplink channel at the same time as much as possible. However, if the parameters are generated by the UE's own selection, the parameters have great randomness, and in a scenario of multiple UE multiplexes, it is difficult to control all scheduled UEs to access the uplink channel simultaneously.

In the embodiment of the present invention, the random backoff counter is configured by the base station through a radio resource control RRC, where the RRC includes configuration information of the random backoff count; or the random backoff counter is configured by the base station through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH comprises first bit information used for indicating configuration information of the random backoff counter.

It should be noted that the first bit information may be determined according to actual situations, for example: the first bit information is 4 bits, and is not limited herein.

The priority of uplink channel access is defined in rel.13, and parameters of LBT in different priorities are defined, as shown in table 1 below:

channel access priority (p)	CW_min,p	CW_max,p	T_mcot,p	allowed CW_psizes
					1	3	7	2ms	{3,7}
2	7	15	3ms	{7,15}
					3	15	63	8or 10ms	{15,31,63}
4	15	1023	8or 10ms	{15,31,63,127,255,511,1023}

TABLE 1

It can be seen that, for the priorities of different uplink channels, the value ranges of CWS are different, CW_min,pIs CWS minimum, CW_max,pIs CWS maximum, T_mcot,pFor channel occupancy time, the allowed CW is also given in Table 1_psizes, i.e. the range of CWS values, which includes all possible values of CWS.

In this embodiment of the present invention, the CWS may be configured by a base station through Radio Resource Control (RRC, abbreviation), where the RRC includes configuration information of the size of the contention window, that is, a correlation coefficient is added to the RRC, for example: rel.14 contention window configuration parameters (rel-14-cws-configuration), then configuring the parameters to the UE in a semi-static manner, and adjusting the contention window according to the coefficients after the UE occupies the uplink channel; alternatively, the CWS may be configured by the base station through a Physical Downlink Control Channel (PDCCH), where the PDCCH includes second bit information used to indicate configuration information of the contention window size, as shown in table 2 below, where 4 bits are added to UL-Grant scheduling information of the PDCCH to indicate a specific configuration of the CWS, and the UE acquires the specific configuration of the CWS from the UL-Grant scheduling information, for example: and when the bit is 0011, the value of the CWS is indicated to be 31, and then when the UE preempts the uplink channel, the contention window is adjusted according to the value of the CWS.

	Bits	Set of CW sizes
			1	0000	3
2	0001	7
			3	0010	15
4	0011	31
			5	0100	63
6	0101	127
			7	0110	255
8	0111	511
			9	1000	1023

TABLE 2

Specifically, how the base station selects the CWS for the UE to perform uplink LBT is not limited herein, for example: different UEs report the surrounding channel state to the base station, and the base station selects the CWS value suitable for the UE according to the channel state reports reported by the different UEs.

In addition, the value of the Random back-off counter in the invention can also be generated by the base station and dynamically configured to the UE through the PDCCH, and corresponding bits are added in the UL grant scheduling information for indicating the value of the parameter Random back-off counter; alternatively, the value of random back-off counter may be configured semi-statically by the base station through RRC.

Assuming that the CWS is q, the range of the random back-off counter is [1, q ], as shown in table 3 below, when the q values are different, different numbers of bits need to be added to the PDCCH to indicate the value of the random back-off counter.

	Set of CW sizes	Number of bits
			1	3	2
2	7	3
			3	15	4
4	31	5
			5	63	6
6	127	7
			7	255	8
8	511	9
			9	1023	10

TABLE 3

As shown in table 3 above, when the CWS has different values, different bits that need to be added are used to indicate the value of random back-off counter. The CWS size is already obtained from table 2, so the base station adds a corresponding number of bits to the UL-grant scheduling information to indicate the value of random back-off counter. For example: when the CWS is 7, the corresponding 4 bits are 0001, and 3 bits need to be added to indicate the value of random back-off counter based on the 0001 bits.

Therefore, the UE obtains the values of the CWS and the random back-off counter from the UL-grant scheduling information or the RRC, and performs LBT using the parameters to access the uplink channel.

And 305, when the uplink data scheduling mode is self-scheduling, accessing the uplink channel by the UE through a second mode.

In some possible implementations, the accessing, by the UE, the uplink channel through the second manner includes: the UE detects the uplink channel; when the UE detects that the idle time corresponding to the uplink channel is greater than a first threshold, accessing the uplink channel, where the first threshold is configured by the base station, for example: the first threshold is 25 microseconds.

In practical application, as shown in fig. 4b, for self-scheduling, before the UE sends uplink data to the base station, the downlink control information is already sent in the local carrier, that is, the base station already occupies the unlicensed carrier, so that in a short time (or a maximum channel occupation time), the state of the uplink channel is relatively stable, and the UE accesses the uplink channel in the second mode and sends the uplink data to the base station through the uplink channel.

It should be noted that, the sequence of step 304 and step 305 is not limited, for example: step 305 is performed first, and then step 304 is performed.

To facilitate a better understanding of the above-described related methods of embodiments of the present invention, the following also provides related apparatus for cooperating with the above-described methods.

Referring to fig. 5, a schematic structural diagram of a UE500 according to an embodiment of the present invention, where the UE500 is applied to an assisted access authorization access LAA system, the UE500 includes: a receiving module 501, a first access module 502 and a second access module 503.

A receiving module 501, configured to receive an uplink data scheduling manner sent by a base station, where the uplink data scheduling manner includes cross-carrier scheduling and/or self-scheduling;

a first accessing module 502, configured to access the uplink channel in a first manner when the uplink data scheduling manner received by the receiving module 501 and sent by the base station is cross-carrier scheduling, where the first manner includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE;

a second accessing module 503, configured to access the uplink channel in a second manner when the uplink data scheduling manner received by the receiving module 501 and sent by the base station is self-scheduling, where the second manner is a listen before talk LBT manner without a random backoff mechanism.

In another possible implementation manner, the random backoff counter is configured by the base station through a radio resource control RRC, where the RRC includes configuration information of the random backoff count; or the random backoff counter is configured by the base station through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH comprises first bit information used for indicating configuration information of the random backoff counter.

In another possible implementation manner, the size of the contention window is configured by the base station through an RRC, where the RRC includes configuration information of the size of the contention window; or the contention window size is configured by the base station through a PDCCH, where the PDCCH includes second bit information used to indicate configuration information of the contention window size.

In other possible implementations, the first access module 502 is specifically configured to perform CCA detection for spatial channel assessment on the uplink channel; when the uplink channel is detected to be idle, accessing the uplink channel, and when the uplink channel is detected to be occupied, performing a random backoff mechanism, that is: acquiring the N value (N is an integer larger than 0) of a random backoff counter configured by a base station, subtracting 1 from the value of the random backoff counter every time an idle time slot is detected, detecting the defer duration of an uplink channel after subtracting 0 from N, and accessing the uplink channel when the defer duration is idle.

It can be seen that, when the uplink data scheduling manner determined by the base station is cross-carrier scheduling, before the UE accesses the uplink channel, the UE first detects the uplink channel, and when the UE detects that the uplink channel is idle, the UE accesses the uplink channel and sends the uplink data to the base station through the uplink channel, and when the UE detects that the uplink channel is occupied, the UE does not directly access the uplink channel but accesses the uplink channel after performing random backoff, thereby avoiding that the UE cannot normally send the uplink data to the base station through the uplink channel when the uplink channel is occupied.

In some possible implementations, the second access module 503 is specifically configured to detect the uplink channel; and when detecting that the idle time corresponding to the uplink channel is greater than a first threshold value, accessing the uplink channel, wherein the first threshold value is configured by the base station.

Therefore, when the uplink data received by the receiving module is scheduled in a self-scheduling mode, the second access module only needs to detect the uplink channel, and the operation is simple. When detecting that the idle time corresponding to the uplink channel is greater than a first threshold, ending the detection of the uplink channel, directly accessing the uplink channel, and sending the uplink data to the base station through the uplink channel, where the first threshold is configured by the base station according to an actual situation, for example: 25 microseconds, which is not specifically limited herein.

It can be seen that, when the uplink data received by the receiving module is scheduled in a cross-carrier manner, the first access module accesses the uplink channel in a first manner, and when the uplink data received by the receiving module is scheduled in a self-scheduling manner, the second access module accesses the uplink channel in a second manner, thereby solving the problem of uplink channel access in the LAA system. The first parameter included in the first mode is an uplink channel access parameter configured for the UE by the base station, and is not configured by the UE itself, so that it can be ensured that multiple UEs access the uplink channel at the same time as much as possible, thereby improving the utilization rate of the uplink channel and effectively utilizing communication resources.

In one possible implementation manner, the receiving module 501, the first access module 502 and the second access module 503 may be software modules, which can be executed in a processor of a computer system, or may be a specific integrated circuit, which is not limited herein. The above and other operations and/or functions of the receiving module 501, the first access module 502, and the second access module 503 are respectively for implementing corresponding flows of the method shown in fig. 3, and are not described herein again for brevity.

Referring to fig. 6, an embodiment of a base station 600 according to an embodiment of the present invention is schematically illustrated, where the base station is applied to an LAA system, and the base station includes a determining module 601 and a sending module 602.

A determining module 601, configured to determine an uplink data scheduling manner, where the uplink data scheduling manner includes cross-carrier scheduling and/or self-scheduling;

a sending module 602, configured to send the uplink data scheduling manner determined by the determining module 601 to a user equipment UE, where when the base station determines that the uplink data scheduling manner is the cross-carrier scheduling, the UE accesses the uplink channel in a first manner, where the first manner includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE; and when the base station determines that the uplink data scheduling mode is the self-scheduling mode, the UE accesses the uplink channel through a second mode, wherein the second mode is an LBT mode without a random backoff mechanism.

In one possible implementation, the determining module 601 can be executed in a processor of a computer system, and may also be a specific integrated circuit, which is not limited herein. Moreover, the above and other operations and/or functions of the determining module 601 are respectively for implementing corresponding flows of the method shown in fig. 3, and are not described herein again for brevity.

The embodiment shown in fig. 5 describes a specific structure of the UE from the perspective of functional modules, and the following describes a specific structure of the UE from the perspective of hardware in conjunction with the embodiment of fig. 7:

referring to fig. 7, another schematic structural diagram of a UE700 according to an embodiment of the present invention, the UE700 includes one or more processors 701, a memory 702, a bus system 703 and a transceiver 704, the processors 701, the memory 702 and the transceiver 704 are connected via the bus system 703, wherein the memory 702 stores one or more programs 705, and the one or more programs 705 include instructions, which when executed by the UE700, cause the UE700 to perform the method shown in the embodiment of fig. 3.

It should be noted that the processor 701 may be a CPU, and the processor 701 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor, or the processor may be any conventional processor or the like. In the implementation process, the step of accessing the uplink channel by the UE may be completed by an instruction in the form of a hardware integrated logic circuit or software in the processor 701, and may be directly implemented as a hardware processor, or may be completed by a combination of a hardware module and a software module in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

It should be noted that the UE shown in fig. 7 may correspond to the UE in the method for accessing an uplink channel in the embodiment of the present invention, and the above and other operations and/or functions of each unit in the UE are respectively for implementing the corresponding flow of the method shown in fig. 3, and are not described herein again for brevity.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the UE and the unit described above may refer to corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the technical solution provided by the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a 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 stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The uplink channel access method and the related device provided by the present invention are introduced in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An uplink channel access method is applied to an authorized auxiliary access LAA system, and comprises the following steps:

receiving an uplink data scheduling mode sent by a base station by User Equipment (UE), wherein the uplink data scheduling mode comprises cross-carrier scheduling and/or self-scheduling;

when the uplink data scheduling mode is cross-carrier scheduling, the UE accesses the uplink channel through a first mode, wherein the first mode comprises a first parameter, and the first parameter is an uplink channel access parameter configured for the UE by the base station;

when the uplink data scheduling mode is self-scheduling, the UE accesses the uplink channel through a second mode, wherein the second mode is a Listen Before Talk (LBT) mode without a random backoff mechanism;

the first parameter includes a random backoff counter and/or a contention window size, wherein a value of the random backoff counter and/or the contention window size is configured by the base station through a Physical Downlink Control Channel (PDCCH), and the PDCCH includes first bit information used for indicating configuration information of the random backoff counter and/or second bit information used for indicating configuration information of the contention window size;

the accessing, by the UE, the uplink channel in the first mode includes:

the UE carries out channel detection on the uplink channel;

when the UE detects that the uplink channel is occupied, the UE acquires the value N of a random backoff counter, wherein N is an integer greater than or equal to 0;

every time an idle time slot is detected, the UE subtracts 1 from the N value of the random backoff counter;

when N is 0, the UE detects the backoff duration of the uplink channel, and if the uplink channel is idle in the backoff duration, the UE accesses the uplink channel;

the accessing, by the UE, the uplink channel in the second mode includes:

the UE detects the uplink channel;

and when the UE detects that the idle time of the uplink channel is greater than a first threshold value, accessing the uplink channel, wherein the first threshold value is configured by the base station.

2. The method of claim 1, wherein the random backoff counter is configured by the base station through a Radio Resource Control (RRC), wherein the RRC contains configuration information of the random backoff count.

3. The method of claim 1, wherein the contention window size is configured by the base station through an RRC, and wherein the RRC includes configuration information of the contention window size.

4. An uplink channel access method, which is applied to an licensed-assisted access (LAA) system, is characterized in that the method comprises:

a base station determines an uplink data scheduling mode, wherein the uplink data scheduling mode comprises cross-carrier scheduling and/or self-scheduling;

the base station sends the determined uplink data scheduling mode to User Equipment (UE), wherein when the base station determines that the uplink data scheduling mode is the cross-carrier scheduling mode, the UE accesses the uplink channel through a first mode, the first mode comprises a first parameter, and the first parameter is an uplink channel access parameter configured for the UE by the base station; when the base station determines that the uplink data scheduling mode is the self-scheduling mode, the UE accesses the uplink channel through a second mode, wherein the second mode is a Listen Before Talk (LBT) mode without a random backoff mechanism;

the first parameter includes a random backoff counter and/or a contention window size, where a value of the random backoff counter and/or the contention window size is configured by the base station through a Physical Downlink Control Channel (PDCCH), where the PDCCH includes first bit information used for indicating configuration information of the random backoff counter or second bit information used for indicating configuration information of the contention window size;

the accessing, by the UE, the uplink channel in the first mode includes:

the UE carries out channel detection on the uplink channel;

the accessing, by the UE, the uplink channel in the second mode includes:

the UE detects the uplink channel;

5. The method of claim 4, wherein the random backoff counter is configured by the base station through a Radio Resource Control (RRC), wherein the RRC contains configuration information of the random backoff count.

6. The method of claim 4, wherein the contention window size is configured by the base station through an RRC, and wherein the RRC contains configuration information of the contention window size.

7. A user equipment, UE, for use in a licensed assisted access, LAA, system, the UE comprising:

a receiving module, configured to receive an uplink data scheduling manner sent by a base station, where the uplink data scheduling manner includes cross-carrier scheduling and/or self-scheduling;

a first access module, configured to access an uplink channel in a first manner when the uplink data scheduling manner is a cross-carrier scheduling manner, where the first manner includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE;

a second access module, configured to access the uplink channel in a second manner when the uplink data scheduling manner is self-scheduling, where the second manner is a listen before talk LBT manner without a random backoff mechanism;

the first access module is configured to perform channel detection on the uplink channel;

when the uplink channel is detected to be occupied, acquiring the value N of a random backoff counter, wherein N is an integer greater than or equal to 0;

every time an idle time slot is detected, subtracting 1 from the N value of the random backoff counter;

when N is 0, detecting the backoff duration of the uplink channel, and if the uplink channel is idle in the backoff duration, accessing the uplink channel;

the second access module is specifically configured to detect the uplink channel, and access the uplink channel when it is detected that the idle time of the uplink channel is greater than a first threshold, where the first threshold is configured by the base station.

8. The UE of claim 7, wherein the random backoff counter is configured by the base station through a Radio Resource Control (RRC), and wherein the RRC carries configuration information of the random backoff count.

9. The UE of claim 7, wherein the contention window size is configured by the base station through RRC, and wherein configuration information of the contention window size is contained in the RRC.

10. A base station, the base station being applied to a licensed assisted access, LAA, system, the base station comprising:

a determining module, configured to determine an uplink data scheduling manner, where the uplink data scheduling manner includes cross-carrier scheduling and/or self-scheduling;

a sending module, configured to send the uplink data scheduling manner determined by the determining module to a user equipment UE, where when the base station determines that the uplink data scheduling manner is the cross-carrier scheduling, the UE accesses an uplink channel in a first manner, where the first manner includes a first parameter, and the first parameter is an uplink channel access parameter configured by the base station for the UE; when the base station determines that the uplink data scheduling mode is the self-scheduling mode, the UE accesses the uplink channel through a second mode, wherein the second mode is an LBT mode without a random backoff mechanism;

the accessing, by the UE, the uplink channel in the first mode includes:

the UE carries out channel detection on the uplink channel;

the accessing, by the UE, the uplink channel in the second mode includes:

the UE detects the uplink channel;

11. The base station of claim 10, wherein the random backoff counter is configured by the base station through a Radio Resource Control (RRC), wherein the RRC comprises configuration information of the random backoff count.

12. The base station of claim 10, wherein the contention window size is configured by the base station through an RRC, and wherein the RRC includes configuration information of the contention window size.

13. A User Equipment (UE), comprising:

one or more processors, a memory, a bus system, and a transceiver, the processors, the memory, and the transceiver being connected by the bus system;

wherein the memory stores one or more programs therein, the one or more programs comprising instructions that when executed by the UE cause the UE to perform the method of any of claims 1 to 3.