WO2017125077A1

WO2017125077A1 - Data transmission method and apparatus

Info

Publication number: WO2017125077A1
Application number: PCT/CN2017/071963
Authority: WO
Inventors: 杨玲; 苟伟; 赵亚军; 李新彩
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-01-21
Filing date: 2017-01-20
Publication date: 2017-07-27
Also published as: CN106993334A

Abstract

The present invention provides a data transmission method and apparatus. The method comprises: a first user equipment (UE) or a first user equipment (UE) group contends for an unlicensed carrier according to a preset listen-before-talk (LBT) mechanism or preset clear channel assessment (CCA); when the first UE or the first UE group does not obtain, by means of contention, the unlicensed carrier on a scheduling subframe, the first UE or the first UE group attempts to again contend for an unlicensed carrier on a candidate transmission subframe; and when the first UE or the first UE group obtains, by means of contention, the unlicensed carrier on the scheduling subframe or the candidate transmission subframe, the first UE or the first UE group performs uplink transmission on a current subframe. By means of the present invention, the problem, in the related art, of failing to perform uplink transmission when an unlicensed carrier is not obtained in contention before a scheduling subframe is resolved, thereby improving the efficiency of the uplink transmission.

Description

Data transmission method and device

Technical field

The present invention relates to the field of communications, and in particular to a data transmission method and apparatus.

Background technique

With the rapid growth of data services, the data transmission pressure on the carrier of the licensed spectrum is also increasing. Therefore, the use of carriers of unlicensed spectrum to share the data traffic in the licensed carrier becomes an important evolution direction of the development of Long Term Evolution (LTE). The unlicensed spectrum is characterized by: no need to purchase, that is, the spectrum resource has zero cost, and has the characteristics of free/low cost; the individual and the enterprise can participate in the deployment, and the equipment of the equipment vendor can be deployed arbitrarily, with low admission requirements and low cost. The characteristics of the band 5GHz, 2.4GHz, etc. can be used, with the characteristics of large available bandwidth; resource sharing, that is, when multiple different systems are operating therein or different operators of the same system operate, some shared resources can be utilized. Ways to improve spectrum utilization efficiency, and so on.

Based on the characteristics of the above-mentioned requirements and unlicensed carriers, the carrier work content of the unlicensed spectrum for the LTE system was started in September 2014, and the topic was named as LTE (Long Term Evolution-Unlicensed Carrier). , referred to as LTE-U), also called Licensed-Assisted Access (LAA). This technology will enable the LTE system to use the carriers of the existing unlicensed spectrum, greatly increasing the potential spectrum resources of the LTE system, enabling the LTE system to obtain lower spectrum costs.

In addition, according to the regulatory requirements, before using the unlicensed carrier for transmission, you need to perform the Listening Before Talk (LBT) or Clear Channel Assessment (CCA) operation to obtain the unlicensed carrier. Use rights. Second, in the LTE system, the UE is scheduled by the evolved base station eNB. Therefore, the UE must transmit the information on the unlicensed carrier to meet the LBT/CCA success and the UpLink grant (UL grant) information.

It can be seen that when the UE receives the uplink grant information sent by the eNB, the UE fails to compete for the unlicensed carrier before scheduling the subframe, and the UE cannot perform uplink transmission, thereby causing the uplink grant information to be invalid and causing the UE to be allocated to the UE. Waste of resources. In view of the above problems in the related art, there is currently no effective solution.

Summary of the invention

The embodiment of the present invention provides a data transmission method and apparatus, so as to at least solve the problem that the UE cannot perform uplink transmission before competing for an unlicensed carrier before scheduling a subframe in the related art.

According to an aspect of the present invention, a data transmission method is provided, including: the first user equipment UE or the first user equipment group UE evaluates the CCA to compete for an unlicensed carrier according to a preset first listening and then an LBT mechanism or an idle channel; When the first UE or the first UE group does not compete for an unlicensed carrier on the scheduling subframe, try to re-competition the unlicensed carrier on the candidate transmission subframe; the first UE or the UE group is in the scheduling subframe Or when the candidate transmission subframe contends to the unlicensed carrier, Uplink transmission is performed on the current subframe.

Optionally, the candidate transmission subframe is indicated by the base station eNB by using scheduling information; or, by a preset rule indication.

Optionally, when the candidate transmission subframe is indicated by the base station eNB by using the scheduling information, the first UE or the first UE group performs uplink transmission on the candidate transmission subframe, where: the first The UE or the first UE group receives the scheduling information sent by the eNB, and attempts to compete for the unlicensed carrier on the transmission subframe corresponding to the specific timing relationship.

Optionally, the specific timing relationship includes: the uplink scheduling grant information is sent on the subframe n, and the uplink transmission is in the subframe n+k, where the value of k is a value in the value set.

Optionally, the value in the set of values is a positive integer greater than 1.

Optionally, when the first UE or the first UE group fails to perform LBT or CCA before the scheduling subframe corresponding to the timing relationship n+k, the method further includes: the first UE or The first UE group shortens the value of k in the timing relationship; the first UE or the first UE group determines a scheduling subframe position according to the value of the shortened k.

Optionally, the shortened k has a value of 1, or, 2, or 3.

Optionally, when the first UE or the first UE group fails to perform LBT or CCA before the scheduling subframe corresponding to the timing relationship n+k, the method further includes: the first UE or The first UE group simplifies LBT mechanisms and/or parameters for competing for unlicensed carriers; the first UE or the first UE group competes on a candidate scheduling subframe according to a simplified LBT mechanism and/or parameters The right to use the unlicensed carrier.

Optionally, the preset rule includes at least one of the following: a time domain offset, a candidate scheduling information set, and a transmission pattern.

Optionally, the time domain offset is determined by using at least one of the following: the eNB is previously agreed with the first UE or the first UE group; and the eNB passes the physical layer DCI signaling. Notifying the first UE or the first UE group; notifying, by the eNB, the first UE or the first UE group by using a common downlink control information DCI;

Optionally, when the transmission location of the candidate transmission subframe is indicated by a time domain offset, performing uplink transmission on the candidate transmission subframe by the first UE or the first UE group includes: The first UE or the first UE group performs the use of the LBT or CCA to detect a contention of a non-authorized carrier before the subframe corresponding to the time domain offset; in the first UE or the first UE When the group successfully contends to the unlicensed carrier, the first UE or the first UE group performs uplink transmission on the subframe corresponding to the time domain offset; in the first UE or the first UE When the group does not compete for the unlicensed carrier, the first UE or the first UE group continues to try to compete for the unlicensed carrier in the subframe corresponding to the time domain offset implicitly, thereby performing uplink transmission.

Optionally, the time domain offset implicit corresponding candidate transmission subframe includes at least one of: a subframe backward offset from the scheduling subframe, and a subframe corresponding to the time domain offset; Scheduling a subframe to continuously continue part or all of the subframes corresponding to the length of the time domain offset; starting from the subframe in which the time domain offset is located, all or part of the duration of the duration of the time domain offset Subframe.

Optionally, when the first UE or the first UE group competes before any one of the candidate transmission subframes When the carrier is not authorized, the first UE or the first UE group performs uplink transmission on the current transmission subframe, where other candidate transmission subframe configurations except the current transmission subframe are invalid.

Optionally, when the transmission location of the candidate transmission subframe is indicated by the candidate scheduling information set, performing uplink data transmission by the first UE or the first UE group on the candidate transmission subframe includes: The first UE or the first UE group sequentially attempts to re-competition the unlicensed carrier on the time domain subframe resource corresponding to the candidate scheduling information set; if the first time domain corresponding to the candidate scheduling information set The first UE or the first UE group stops uplink transmission on the first time domain subframe, and continues to correspond to the candidate scheduling information set. The second time domain subframe resource after the first time domain subframe resource competes for the use right of the unlicensed carrier; if any one of the time domain subframe resources corresponds to the time domain subframe resource competition in the candidate scheduling information set To the unlicensed carrier, the first UE or the first UE group performs uplink transmission on the current time domain subframe.

Optionally, the candidate transmission pattern or the candidate scheduling information set is determined by using at least one of the following: the eNB is previously agreed with the first UE or the first UE group; and the eNB passes the physical layer. The DCI signaling is notified to the first UE or the first UE group; the eNB is notified to the first UE or the first UE group by using a common downlink control information DCI; definition.

Optionally, determining the parameters of the candidate transmission pattern includes at least one of: a candidate transmission resource start location, an interval, a candidate transmission resource number, a candidate transmission resource end location, a candidate transmission resource start location, and a scheduling subframe. Time domain offset.

Optionally, when the transmission location of the candidate transmission subframe is indicated by the transmission pattern, performing uplink transmission on the candidate transmission subframe by the first UE or the first UE group includes: the first UE Or the first UE group sequentially performs the use right of the LBT or CCA to detect the contention of the unlicensed carrier before the corresponding subframe in the transmission pattern; if the corresponding first time domain subframe resource in the transmission pattern The first UE or the first UE group stops uplink transmission on the first time domain subframe, and continues the corresponding first time domain in the transmission pattern. The second time domain subframe resource after the frame resource contends for the use right of the unlicensed carrier; if any one of the time domain subframe resources in the transmission pattern competes with the unlicensed carrier before the time domain subframe resource, The first UE or the first UE group performs uplink transmission on the current time domain subframe.

Optionally, when the first UE fails to transmit on the scheduling subframe, and the retransmission is attempted on the candidate transmission subframe, the first UE is configured to be normally scheduled on the candidate transmission subframe. The situation between the two UEs includes one of the following: Case 1: the frequency domain resource location of the first UE and the second UE is different; Case 2: the frequency domain resource of the first UE and the second UE The location partially overlaps; Case 3: The frequency domain resource locations of the first UE and the second UE completely overlap.

Optionally, when the situation between the first UE and the second UE is case 1, when the first UE and the second UE both contend to an unlicensed carrier, the first UE and the The second UE simultaneously performs uplink transmission on the subframe; when the first UE and the second UE do not compete for an unlicensed carrier, the first UE and the second UE try to be candidates Re-competing the unlicensed carrier on the transmission subframe; if the candidate transmission subframe contends for the unlicensed carrier, the first UE and/or the second UE perform uplink transmission on the current subframe; One of a UE and the second UE When competing for an unlicensed carrier, the UE that contends to the unlicensed carrier performs uplink transmission on the current subframe; the UE that does not contend for the unlicensed carrier before the current subframe continues to re-competition the unlicensed carrier on the candidate transmission subframe. And competing for an unlicensed carrier before the candidate transmission subframe, and performing uplink transmission on the current subframe.

Optionally, when the situation between the first UE and the second UE is case 2, when the first UE and the second UE simultaneously compete for an unlicensed carrier, the first UE And performing, by the second UE, uplink transmission on a current subframe; or, the second UE performs uplink transmission normally in a current subframe, and the first UE is in a candidate subframe subsequent to the current subframe. Attempts to re-chance the unlicensed carrier on a specific subframe, or not to compete for the unlicensed carrier to transmit directly.

Optionally, the specific subframe includes: a first candidate subframe in the candidate subframe after the current subframe, or a randomly selected subframe in the candidate transmission subframe after the current subframe, or Indicates one subframe determined jointly with the candidate subframe after the current subframe.

Optionally, when the situation between the first UE and the second UE is Case 3, the first UE and the second UE simultaneously compete for an unlicensed carrier, and the first UE When the frequency domain resource location of the second UE is completely overlapped, the first UE and the second UE perform uplink transmission together by means of multi-user multiple input and multiple MU-MIMO; or, by using a new multiple access technology MUSA technology for uplink transmission.

Optionally, when the first UE and the second UE frequency domain resources overlap or collide, the resources of the first UE or the second UE include at least one of the following: Mode 1: the first UE or The second UE uses idle resources for data transmission; mode 2: the first UE or the second UE uses a certain time domain and/or a frequency domain corresponding to the resource for data transmission; mode 3: the first UE or The second UE adopts the newly indicated resource.

Optionally, the idle resource includes at least one of: a resource reserved by the eNB to the first UE or the second UE in a candidate transmission subframe or a transmission pattern; or the eNB and the eNB a resource previously agreed by the first UE or the second UE; or a resource configured by a higher layer RRC; or a predefined resource.

Optionally, the first UE or the second UE performs time domain and/or frequency domain offset in one of the following manners: physical layer DCI signaling triggering; or, high layer signaling triggering; or, The triggered indication information of the first UE or the second UE identifier scrambling is triggered.

Optionally, the LBT rule adopted between the first UE and the second UE includes at least one of the following: the second UE and the first UE are configured with the same LBT mechanism and/or parameter; or The second UE configures a LBT mechanism or parameter that is more simplified than the first UE; or the second UE configuration is earlier than a CCA detection start position of the first UE; or the second UE and the The first UE randomly selects its own CCA detection starting point in the configured LBT region; or the LBT mechanism or parameter adopted by the first UE or the second UE before the candidate transmission subframe is earlier than the LBT mechanism adopted before the scheduling subframe or The parameters are more simplified.

According to another aspect of the present invention, a data transmission apparatus is provided, which is applied to a first user equipment UE or a first user equipment group UE side, and includes: a first contention module, which is set to listen according to a preset The LBT mechanism or the idle channel evaluates the CCA to compete for the unlicensed carrier; the second contention module is configured to attempt to re-competition the unlicensed carrier on the candidate transmission subframe when the unlicensed carrier is not contending on the scheduling subframe; the transmission module is set to The first UE or UE group is in scheduling When a sub-frame or a candidate transmission sub-frame competes for an unlicensed carrier, uplink transmission is performed on the current sub-frame.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

According to the preset, the LBT mechanism or the idle channel is used to evaluate the CCA to compete for the unlicensed carrier; when the unlicensed carrier is not contending on the scheduling subframe, try to re-competition the unlicensed carrier on the candidate transmission subframe; When the candidate transmission subframe contends to the unlicensed carrier, the uplink transmission is performed on the current subframe.

In the embodiment of the present invention, the first user equipment UE or the first user equipment group UE evaluates the CCA to compete for the unlicensed carrier according to the LBT mechanism or the idle channel, and the first UE or the first UE group is in the scheduling subframe. When the unlicensed carrier is not contending, the attempt is made to re-competition the unlicensed carrier on the candidate transmission subframe, and then the first UE or the UE group competes for the unlicensed carrier on the scheduling subframe or the candidate transmission subframe, in the current subframe. The uplink transmission is performed, thereby solving the problem that the UE cannot perform uplink transmission before the scheduling subframe fails to compete for the uplink transmission in the related art, and the effect of improving the uplink transmission efficiency is achieved.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flow chart of a data transmission method according to an embodiment of the present invention;

2 is a block diagram showing the structure of a data transmission device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of adjusting a timing relationship value according to a UE side LBT failure trigger according to an embodiment of the present invention; FIG.

4 is a schematic diagram of a transmission pattern of a UE in a transmission time window in an FDD system according to an embodiment of the present invention;

5 is a schematic diagram of a transmission pattern of a UE in a transmission time window in a TDD system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of collisions between a normally scheduled UE and a non-normally scheduled UE transmission resource according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

A data transmission method is provided in this embodiment. FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: The first user equipment UE or the first user equipment group UE listens to the LBT mechanism or idle according to the preset Channel evaluation CCA competing for unlicensed carriers;

Step S104: When the first UE or the first UE group does not compete for the unlicensed carrier on the scheduling subframe, try to re-competition the unlicensed carrier on the candidate transmission subframe.

Step S106: When the first UE or the UE group competes for an unlicensed carrier on the scheduling subframe or the candidate transmission subframe, perform uplink transmission on the current subframe.

In the foregoing step S102 to step S106, the first user equipment UE or the first user equipment group UE evaluates the CCA to compete for the unlicensed carrier according to the preset LBT mechanism or the idle channel, and the first UE or the first UE When a UE group does not contend for an unlicensed carrier on the scheduling subframe, it attempts to re-competition the unlicensed carrier on the candidate transmission subframe, and the first UE or the UE group competes for non-authorization on the scheduling subframe or the candidate transmission subframe. In the case of the carrier, the uplink transmission is performed on the current subframe, thereby solving the problem that the UE cannot perform uplink transmission before the scheduling subframe fails to compete for the uplink transmission, and the effect of improving the uplink transmission efficiency is achieved.

It should be noted that the candidate transmission subframe involved in this embodiment is indicated by the base station eNB by using scheduling information; or, by a preset rule indication. The following describes the two ways of indicating candidate transmission subframes separately;

Manner 1: When the candidate transmission subframe is indicated by the scheduling information by the base station eNB, the first UE or the first UE group involved in the step S106 is uplinked on the candidate transmission subframe in the embodiment. In an optional implementation manner, the first UE or the first UE group receives the scheduling information sent by the eNB, and attempts to re-competition the unlicensed carrier on the transmission subframe corresponding to the specific timing relationship.

The specific timing relationship includes: the uplink scheduling grant information is sent on the subframe n, and the uplink transmission is performed on the subframe n+k. It should be noted that the value of the k is defaulted to a value in the value set; The value in the set of values involved in this embodiment is a positive integer greater than one. The value of k is preferably 1, or 2, or 3 in this embodiment.

In an optional implementation manner in this embodiment, when the first UE or the first UE group fails to re-competition the unlicensed carrier for the first time in the candidate transmission subframe, that is, in the first UE or the first UE group, When the LBT or the CCA fails to be performed before the scheduling sub-frame corresponding to the timing relationship n+k (for example, n+4), the method in this embodiment may further include: shortening the value of k in the timing relationship of the first UE or the first UE group; The first UE or the first UE group determines the scheduling subframe position according to the value of the shortened k; for example, the shortened value of k is 2 or 3. Of course, the value of the foregoing transmission subframe is only used for example. The description does not constitute a limitation of the present invention, as long as the value of k in the set of values is achievable in the present invention.

In another optional implementation manner of this embodiment, when the first UE or the first UE group fails to perform LBT or CCA before the scheduling subframe corresponding to the timing relationship n+k, the method in this embodiment further includes: The first UE or the first UE group simplifies LBT mechanisms and/or parameters for competing for unlicensed carriers; the first UE or the first UE group competes for unauthorized non-authorization on the candidate scheduling subframe according to the simplified LBT mechanism and/or parameters The right to use the carrier.

It should be noted that the simplified LBT mechanism and/or parameters may be an eCCA process or only one CCA duration duration in the specific application scenario of the embodiment, and may be other simplified manners, as long as the competition fee is shortened. The duration of the carrier is within the scope of the present invention.

Manner 2: The preset rule involved in this embodiment includes at least one of the following: a time domain offset, a candidate scheduling information set, and a transmission pattern.

It should be noted that the time domain offset involved in this embodiment may be determined by at least one of the following: the eNB is previously agreed with the first UE or the first UE group; and the eNB is notified by the physical layer DCI signaling. To the first UE or the first UE group; notified by the eNB to the first UE or the first UE group through the common downlink control information DCI; notified by the high layer signaling; predefined.

Based on this, in the embodiment, when the transmission location of the candidate transmission subframe is indicated by the time domain offset, the first UE or the first UE group involved in the embodiment performs uplink transmission on the candidate transmission subframe. The way can be achieved by:

Step S11: The first UE or the first UE group performs LBT or CCA detection of the right to use the non-authorized carrier before the subframe corresponding to the time domain offset;

Step S12: When the first UE or the first UE group successfully contends to the unlicensed carrier, the first UE or the first UE group performs uplink transmission on the subframe corresponding to the time domain offset;

Step S13: When the first UE or the first UE group does not compete for the unlicensed carrier, the first UE or the first UE group continues to try to compete for the unlicensed carrier in the subframe corresponding to the time domain offset implicitly, thereby performing Uplink transmission.

It should be noted that the candidate transmission subframe corresponding to the time domain offset involved in the embodiment includes at least one of the following: the backward offset interval from the scheduling subframe is the time domain offset corresponding to the time domain offset. a subframe; a partial or all subframes corresponding to a continuous duration of the time domain offset length from the scheduling subframe; all or a portion corresponding to the duration of the continuous duration time domain offset from the subframe in which the time domain offset is located Subframe.

And the first UE or the first UE, when the first UE or the first UE group contends to the unlicensed carrier before any one of the candidate transmission subframes, based on the candidate transmission subframe corresponding to the time domain offset The group performs uplink transmission on the current transmission subframe, where other candidate transmission subframe configurations except the current transmission subframe are invalid.

In another optional implementation manner of this embodiment, when the transmission location of the candidate transmission subframe is indicated by the candidate scheduling information set, the first UE or the first UE group involved in step S106 in the embodiment is in the candidate transmission. The method of performing uplink data transmission on a subframe can be implemented by the following steps:

Step S21: The first UE or the first UE group sequentially attempts to re-competition the unlicensed carrier on the time domain subframe resource corresponding to the candidate scheduling information set;

Step S22: If the first time domain subframe resource in the candidate scheduling information set does not compete for the unlicensed carrier, the first UE or the first UE group stops uplink transmission on the first time domain subframe, and continues. Playing the right to use the unlicensed carrier before the second time domain subframe resource corresponding to the corresponding first time domain subframe resource in the candidate scheduling information set;

Step S23: If any one of the time domain subframe resources in the candidate scheduling information set contends to the unlicensed carrier, the first UE or the first UE group performs uplink transmission on the current time domain subframe.

The candidate transmission resource pattern or the candidate scheduling information set involved in this embodiment may pass at least one of the following The mode is determined by the eNB in advance with the first UE or the first UE group; the eNB is notified to the first UE or the first UE group by the physical layer DCI signaling; and the eNB is notified to the first UE by using the common downlink control information DCI. Or the first UE group; notified by higher layer signaling; predefined.

In addition, the parameter for determining the candidate transmission resource pattern in this embodiment may include at least one of: a candidate transmission resource start position, an interval, a candidate transmission resource number, a candidate transmission resource end position, a candidate transmission resource start position, and a scheduling subframe. The time domain offset between.

In still another optional implementation manner of this embodiment, when the first UE fails to transmit on the scheduling subframe, and the retransmission is attempted on the candidate transmission subframe, the first UE is normally scheduled on the candidate transmission subframe. The case between the second UE includes one of the following: Case 1: the frequency domain resource location of the first UE and the second UE are different; Case 2: the frequency domain resource location of the first UE and the second UE partially overlap; Case 3: The frequency domain resource locations of the first UE and the second UE completely overlap.

When the situation between the first UE and the second UE is Case 1, the method in this embodiment includes:

When the first UE and the second UE both contend for the unlicensed carrier, the first UE and the second UE simultaneously perform uplink transmission on the subframe;

Step S31: When neither the first UE nor the second UE competes for the unlicensed carrier, the first UE and the second UE try to re-competition the unlicensed carrier on the candidate transmission subframe;

Step S32: If the unlicensed carrier is contending on the candidate transmission subframe, the first UE and/or the second UE perform uplink transmission on the current subframe.

Step S33: When one of the first UE and the second UE contends to the unlicensed carrier, the UE that contends to the unlicensed carrier performs uplink transmission on the current subframe; and the UE that does not contend to the unlicensed carrier before the current subframe Continue to re-compete the unlicensed carrier on the candidate transmission subframe, and contend for the unlicensed carrier before the candidate transmission subframe, and perform uplink transmission on the current subframe.

When the situation between the first UE and the second UE is Case 2, the method in this embodiment includes:

Step S41: When the first UE and the second UE compete for the unlicensed carrier at the same time, the first UE and the second UE perform uplink transmission on the current subframe; or

Step S42: The second UE normally performs uplink transmission on the current subframe, and the first UE attempts to re-competition the unlicensed carrier on a specific subframe in the candidate subframe after the current subframe, or does not compete for the unlicensed carrier. Transfer directly.

The specific subframe includes: a first candidate subframe in the candidate subframe after the current subframe, or a randomly selected subframe in the candidate transmission subframe after the current subframe, or is indicated by the base station and currently The candidate subframe after the subframe is jointly determined by one subframe.

When the situation between the first UE and the second UE is case 3, the method in this embodiment includes: simultaneously competing for the unlicensed carrier and the frequency of the first UE and the second UE in the first UE and the second UE. When the domain resource locations are completely overlapped, the first UE and the second UE perform uplink transmission together by means of multi-user multiple input and multiple MU-MIMO; or uplink transmission by the new multiple access technology MUSA technology.

For the foregoing three cases, when the resources of the first UE and the second UE overlap or collide, the resources of the first UE or the second UE include at least one of the following: Mode 1: The first UE or the second UE is idle. The data is transmitted by the resource; mode 2: the first UE or the second UE uses a certain time domain and/or a resource corresponding to the frequency domain to perform data transmission; and mode 3: the first UE or the second UE adopts the newly indicated resource.

The idle resource in the mode 1 includes at least one of the following: the eNB reserves the resource to the first UE or the second UE in the candidate transmission subframe or the transmission pattern; or the eNB and the first UE or the second UE in advance An agreed resource; or a resource configured by a higher layer RRC; or a predefined resource.

In the mode 2, the first UE or the second UE performs the time domain and/or the frequency domain offset in one of the following manners: the physical layer DCI signaling triggers; or the high layer signaling triggers; or the first issued by the eNB The indication information that the UE or the second UE identifies the scrambling is triggered.

It should be noted that the LBT rule adopted between the foregoing first UE and the second UE includes at least one of the following: the second UE and the first UE are configured with the same LBT mechanism and/or parameter; or the second UE configuration ratio is a more simplified LBT mechanism or parameter of the UE; or, the second UE configuration is earlier than the CCA detection start position of the first UE; or the second UE and the first UE randomly select their own CCA detection starting point in the configured LBT region; or The LBT mechanism or parameter adopted by the first UE or the second UE before the candidate transmission subframe is more simplified than the LBT mechanism or parameter adopted before the scheduling subframe.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

In the embodiment, a data transmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

2 is a structural block diagram of a data transmission apparatus according to an embodiment of the present invention. The apparatus is applied to a first user equipment UE or a first user equipment group UE side. As shown in FIG. 2, the apparatus includes: a first contention module 22, Set to listen to the LBT mechanism or the idle channel to evaluate the CCA to compete for the unlicensed carrier according to the preset; the second contention module 24, and the first contention module 22, are set to not compete for the unlicensed carrier on the scheduling subframe, An attempt is made to re-competition the unlicensed carrier on the candidate transmission subframe; the transmission module 26 is coupled to the second contention module 24, and is configured to: when the first UE or the UE group competes for the unlicensed carrier on the scheduling subframe or the candidate transmission subframe, Perform uplink transmission on the current subframe.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

The invention is exemplified below in conjunction with an alternative embodiment of the invention;

Embodiment 1:

In the features of the existing LTE system, the user equipment UE performs uplink transmission by the evolved base station eNB, and the LTE system must meet its regulatory requirements if it is to operate on the unlicensed carrier, that is, on the unlicensed carrier. Before the transmission is performed, the LBT is first listened to and then used to obtain the use right of the unlicensed carrier. In this way, the UE may not be able to transmit on the scheduled subframe because the UE does not complete the LBT or CCA procedure or does not compete for the unlicensed carrier on the subframe scheduled by the eNB.

In this alternative embodiment, how to enable the currently scheduled UE to perform uplink transmission when the user equipment performs the first listening before the scheduling subframe and then the LBT or the idle channel assessment CCA detection fails, that is, when the UE is notified by the base station. When the LBT fails to be performed on the subframe, the method for providing the UE with more retransmission opportunities is provided. The method of this alternative embodiment includes:

Manner 1: The evolved base station eNB adjusts the timing relationship and/or the LBT mechanism or parameter between the UL grant and the uplink transmission according to the N scheduling indications and/or according to the LBT failure or the scheduling failure trigger, where N is a positive integer and N can be It is limited to any integer between [X, Y], and both X and Y have positive integers. In an alternative embodiment of this embodiment, X may be greater than or equal to 1, and Y is less than or equal to 4.

The base station eNB sends the uplink grant UL grant information to the UE in the subframe n, and the UE competes for the unlicensed carrier use right before the n+k subframe. If the UE competes for the unlicensed carrier, the UE is in the n+k subframe. Normally send data or perform uplink transmission. If the UE does not compete for the unlicensed carrier before the n+k subframe, the data transmission or uplink transmission cannot be performed on the scheduled subframe. In this way, for the eNB side, it is uncertain whether the UE fails to perform LBT or the UE does not receive the uplink grant UL Grant. It is assumed that the UE can correctly receive the uplink grant information. When the eNB does not receive the data sent by the UE in the scheduling subframe when performing blind detection on the above-mentioned scheduling subframe, it is considered that the UE fails to compete for the unlicensed carrier when performing the LBT failure. At this time, the eNB may attempt to perform the next scheduling information transmission, where the next scheduling information is transmitted after the n+k subframe. In an alternative embodiment of this embodiment, the scheduling information may be retransmitted on the n+k+1 subframe. Similarly, when the UE fails to contend to the unlicensed carrier before the new scheduling subframe, the scheduling grant information may be re-issued according to the foregoing method, and when the number of re-sending the scheduling grant information exceeds the value of N, the eNB stops giving the The UE sends scheduling authorization information. When the UE successfully contends to the unlicensed carrier before any one of the subframes indicated in the foregoing transmission scheduling grant, it is considered that the usage right of the unlicensed carrier is acquired, so that uplink transmission can be performed. It should be noted that the N in the optional embodiment may be preset, or the eNB and the UE agree in advance, or the eNB indicates, or the high layer configuration, or the physical layer DCI notification.

FIG. 3 is a schematic diagram of adjusting a timing relationship value according to a UE side LBT failure trigger according to an embodiment of the present invention. As shown in FIG. 3, when the UE fails to perform uplink transmission on the scheduling subframe and fails to perform uplink transmission, the eNB may be triggered to restart. When the scheduling authorization information is sent, the mechanism or the parameter of the LBT performed by the UE is modified, or the timing relationship between the uplink grant UL Grant and the uplink transmission is modified; or the eNB may modify the UE according to the number of times the uplink scheduling grant information is re-issued. The mechanism or parameter of the LBT is executed, or the timing relationship between the uplink grant UL Grant and the uplink transmission is modified. For example, if the UE performs the LBT failure before scheduling the subframe n (for example, the adopted LBT Cat4, the defer period+eCCA process, and the maximum contention window is 15), the UE may adopt faster access when receiving the new scheduling grant. Channel LBT mechanism Or parameters (for example, the LBT mechanism is unchanged, a smaller contention window is used, that is, the maximum contention window value is reduced by 7; or, a more simplified LBT mechanism, such as an eCCA process or only one CCA duration duration). If the UE fails to compete for the unlicensed carrier before the received subframe of the new scheduling grant indication, the uplink transmission is stopped on the subframe. Waiting for the next new scheduling grant information to be sent, thereby attempting to execute the LBT access channel, and so on. Until the number of LBT failures, or when the number of scheduled grant transmissions exceeds the threshold N, the eNB stops re-issuing the scheduling grant information. Optionally, in addition to the foregoing modifying the LBT mechanism or the parameter, the eNB may also shorten the uplink grant UL Grant and the uplink transmission according to the number of LBT failures and/or the number of times the scheduling grant information is sent. The value of the timing relationship between, for example, is shortened from the timing relationship value 4 to 3, or, 2, or 1. The above operations can be used alone or in combination.

In the above method of the optional embodiment, when the base station continues to resend the scheduling grant information to the UE, the timing relationship between the uplink grant UL Grant and the uplink transmission may be shortened, or may be according to the original n+k principle, that is, k. Is 4. In order to reduce the UE transmission delay, or in order to enable the UE to complete the uplink transmission quickly, in the optional embodiment, the modified timing relationship is selected in the retransmission scheduling grant. Optionally, each time the retransmission scheduling authorization is allowed to use the same modified (shortened) timing relationship, for example, 4, 2, 2, 2, etc., or the timing relationship shorter than the previous one may be sequentially used each time. , for example, 4, 3, 2, 1 and so on. And/or, before the rescheduled subframe, the UE may adopt the same LBT mechanism and/or parameter as the source scheduling subframe, or may adopt a different LBT mechanism and/or parameter than the source scheduling subframe. Preferably, the latter is adopted, that is, the LBT Cat4, defer period+eCCA process is adopted on the source scheduling subframe, and the maximum contention window is 7, and the new LBT mechanism and/or parameters are adopted on the subframes to be rescheduled later. The same simplified LBT can be used, such as the defer period+eCCA process and the maximum contention window is smaller than the source scheduling subframe or the direct eCCA process or LBT Cat2 (only one CCA duration length is idle to obtain the channel usage right) The LBT is simplified in sequence, such as the defer period+eCCA process before the rescheduled subframe m, and the maximum contention window is 3; the eCCA process is executed before the next rescheduled subframe s, and the maximum contention window is 3; A CCA process with only one CCA duration length is executed before a rescheduled subframe f, and so on.

The base station sends the scheduling grant information through the authorized carrier or through the unlicensed carrier. For the former, after receiving the uplink grant information sent by the eNB, the UE performs LBT/CCA detection before the scheduling subframe, and if the UE contends to the unlicensed carrier, the data is normally sent on the scheduling subframe. In the case of not competing for an unlicensed carrier, the data transmission is stopped. In this case (ie cross-carrier scheduling), in order to increase and increase the probability of the UE accessing the channel, the UE may adopt the LBT mechanism of the faster access channel (the LBT mechanism is simplified compared to the channel access method in the Wi-Fi system) . For example, the defer period+eCCA process, or the direct eCCA process, or LBT Cat2. For the latter, before the eNB sends the uplink grant information to the UE, the eNB needs to use the LBT/CCA to contend for the unlicensed carrier before sending the uplink grant information. If there is little downlink data or no data in the downlink, the UE may perform uplink transmission without performing LBT, and the base station needs to send a reserved signal to occupy the channel. However, in order to improve resource utilization and reduce resource waste, the UE may be triggered to adopt a shortened timing relationship value. Alternatively, the UE performs a simplified LBT mechanism, preferably with LBT Cat2. At this time, the mechanism and/or parameters for performing the LBT may be modified according to the number of times the scheduling indication is repeatedly sent or the number of times the UE performs the LBT failure, and/or the timing relationship between the UL grant and the uplink transmission is reduced.

Manner 2: The subframe position to be transmitted by the UE is determined or implicitly determined by a time domain offset.

The time domain offset may be obtained by one of the following: the eNB and the UE agree in advance; or the eNB notifies the UE by using the physical layer signaling DCI; or the eNB notifies the UE by using the public DCI; or, the high layer signaling is notified. Or, broadcast mode notification, or predefined; where the value of the time domain offset is a positive integer number. In addition, the time domain offset can be semi-static or dynamic.

In this optional implementation manner, if the time domain offset obtained by the foregoing manner is 1, the UE contends to the unlicensed carrier before scheduling the subframe, and the UE normally performs uplink data transmission on the scheduling subframe. The acquired time domain offset information is invalid. If the UE does not compete for the unlicensed carrier before scheduling the subframe, the UE attempts to re-competition the unlicensed carrier on the corresponding subframe according to the offset information, and competes to the unlicensed carrier before the corresponding time domain offset quantum frame Then, the UE performs data transmission on the corresponding time domain offset quantum frame. On the other hand, if the UE does not contend for the unlicensed carrier before the corresponding time domain offset quantum frame, the data transmission is stopped, and only the base station is re-scheduled.

Optionally, when the UE performs the LBT failure on the scheduling subframe indicated by the base station, and triggers the use of the time domain offset, the offset may not only indicate that the subframe is offset from the UE scheduling subframe by several subframes. It is also possible to indicate that the quantum frame length is continuously offset from the subframe in which the offset is located, or to indicate that the subframe index number corresponding to the offset from the beginning of the subframe in which the offset is located is the end, or the indication corresponds to The UE may attempt to transmit data in the subframe corresponding to the offset quantum frame starting at the interval of the offset. When the number of times the UE attempts to transmit data increases, the corresponding LBT mechanism and parameter configuration can be adjusted (simplified).

For example, if the offset is 3 and the UE is scheduled to have a subframe index of 1, if the UE fails to perform LBT before subframe 1, the uplink data transmission or uplink may be attempted again at one of the candidate subframe positions described below. transmission:

Subframe 4; or, from subframe 4, 3 subframes, that is,

subframes

4, 5, 6; or, from subframe 4, to subframe 3 in the next frame; or, from subframe 4 Initially, the sub-frame positions of 3 sub-frames are spaced, for example, 4, 8, 12... At this time, it is necessary to limit the length of time or the number of times that the UE can continuously try to perform uplink transmission or the number of times the UE is allowed to perform LBT failure, thereby preventing the detection complexity of the eNB side from being improved. Here, the number of times the LBT failures or retransmissions are allowed to be performed is P, and P is a positive integer. In an alternative embodiment, the P may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Any number.

Method 3: Configure a candidate scheduling information set, where the scheduling information includes candidate scheduling subframe position information and the like.

The scheduling information set may be sent to the UE by using the high layer signaling, or the eNB and the UE agree in advance, or are predefined, or the physical layer signaling is used. For example, if the scheduling set {2, 3, 5, 6} is configured for the UE, the UE may follow the order corresponding to the index numbers in the set, or the order in which the set element values are sequentially increased, or a certain value in the fixed set. Alternatively, randomly select an element in a set and attempt data transmission or uplink transmission from the corresponding element subframe. If the LBT/CCA failure is performed on the corresponding subframe, the UE stops the uplink transmission on the subframe, and attempts to compete for non-authorization again before the subframe corresponding to the subframe index or the subsequent element in the set is attempted in the set. The carrier, if it contends to an unlicensed carrier, performs uplink transmission. If the unlicensed carrier is not contending, the channel access is performed before the corresponding subframe according to the above method, thereby performing uplink transmission. If the UE competes for an unlicensed carrier before any one of the subframes in the corresponding subframe, the UE performs uplink transmission. If the unlicensed carrier has not been contending before the corresponding subframe in the set, the UE stops the uplink transmission. Wait for the eNB to reschedule Wherein, the data can be transmitted on the scheduling subframe and/or the candidate subframe depending on The result of LBT/CCA. In another case, the UE may sequentially attempt data transmission on the corresponding subframe index in the set within a certain time period. The specific time period may be a manner agreed by the eNB and the UE in advance, or predefined, or indicated by the eNB. The number of times the UE can re-transmit the uplink can be implicitly defined by the length of the time period, or the number of times the UE is allowed to perform the LBT failure.

Method 4: Configure a UE candidate transmission location pattern.

The UE candidate transmission location pattern may be obtained by one of the following: the base station and the UE agree in advance, or the upper layer RRC signaling configuration, or the physical layer DCI signaling configuration, or a predefined.

In an optional implementation manner of the optional embodiment, the candidate transmission location pattern may be related to a frame structure or may not be affected by a frame structure. The candidate transmission location pattern may be determined by using a bitmap, or may be determined by the following parameters. Determining at least one of the subframe index corresponding to the normal scheduling, the slot index in the normal scheduling subframe, the interval, the number of candidate positions, the length of the time window, the offset between the normal scheduling subframe and the time window, and the time window The offset, the candidate position start index in the time window, the candidate position interval in the time window, the candidate position length in the time window, the number of candidate positions in the time window, and the candidate position end index in the time window. Through the above parameters, a continuous candidate transmission pattern can be determined, and discrete equal intervals can also be determined (for example, if the uplink grant and the uplink transmission interval are K+4, then the uplink grant is sent on the K subframe, then the K+4 scheduling subframe. If the LBT fails to be executed, the offset between the scheduling subframe and the time window is 8, and the subframes K+8, K+12, ... corresponding to the interval 4 in the time window are used as candidate transmission positions of the UE, or The candidate transmission patterns of the UE may be selected according to the subframe K+12, K+20, ... corresponding to the interval 8, or the candidate transmission locations of the UE. It should be noted that each of the discrete transmission locations may be the same size or different.

The interval may be a subframe level, a slot level, or a frame level. The number of candidate locations is the number of subframes or slots available for transmission of the UE candidate. The time window may include a normally scheduled subframe position, or may be located before or after the normal scheduling subframe. In an alternative embodiment of the optional embodiment, the time window is preferably located after the UE scheduling subframe.

The following describes the use of the UE candidate transmission pattern according to different frame structures:

For the FDD system, it is assumed that the UE is scheduled on subframe n, for example, n is 1, the offset between the scheduling subframe and the time window is 1, the offset within the time window is 0, and the candidate position in the time window The length is 1 subframe, the interval between candidate positions in the time window is 2, and the length of the time window is 6, the candidate transmission position pattern obtained by these parameters.

4 is a schematic diagram of a transmission pattern of a UE in a transmission time window in an FDD system according to an embodiment of the present invention. As shown in FIG. 4, if a UE contends for an unlicensed carrier on a normally scheduled subframe 1, then in subframe 1 The transmission is normally performed. And if the UE does not compete for the unlicensed carrier before the normally scheduled subframe 1, the UE stops transmitting on the subframe 1. And the location corresponding to the configured candidate transmission location pattern (eg, the configured candidate subframe 3) continues to try to compete for the unlicensed carrier, and if it contends to the unlicensed carrier, the UE transmits on the candidate subframe 3. If the unlicensed carrier is still not contending, the UE continues to try to transmit on the subframe 6 corresponding to the next candidate transmission location pattern, and may perform uplink transmission on the subframe 6 as long as it contends to the unlicensed carrier before the subframe 6. . If the unlicensed carrier fails to compete and there is no candidate transmission location within the currently configured time window, the UE abandons the data transmission and waits for the eNB to reschedule. The UE contends to the unlicensed carrier and performs uplink before any one of the candidate transmission location patterns Transmission, the transmission pattern is invalid. The transmission pattern may be configured to be periodic, or aperiodic, or the period is combined with the aperiod, or a continuous candidate transmission location is configured within the time window, or a discrete transmission pattern location configured within the time window. Configure a reissue alternate transfer location.

For the TDD system, the candidate transmission location patterns are different according to different uplink and downlink subframe ratios.

For the uplink and downlink subframe configuration D S U U U, the offset between the scheduling subframe and the time window is 0, the offset in the time window is 0, and the candidate position length in the time window is 2 subframes, candidate positions A candidate transmission position pattern with an interval of 1 and a time window length of 5 is shown in FIG. 5.

FIG. 5 is a schematic diagram of a transmission pattern of a UE in a transmission time window in a TDD system according to an embodiment of the present invention. Based on FIG. 5, if an eNB sends uplink scheduling grant information to a UE in a first downlink subframe in FIG. 5, at this time, uplink The value of the timing value between the authorization and the transmission may be the default 4, and also according to the indicated 2, the timing transmission before the uplink grant and the uplink transmission given in FIG. 5 is 2, that is, the UE is scheduled in the first uplink subframe. . If the UE successfully contends to the unlicensed carrier before the scheduled subframe, the UE performs normal transmission on the scheduling subframe. On the other hand, if the UE does not compete for the unlicensed carrier before scheduling the subframe, the transmission on the scheduling subframe is stopped. Channel access is attempted before the first transmission pattern (e.g., the second uplink subframe in Figure 5) in the configuration time window. If it contends to an unlicensed carrier, it transmits at the first transmission pattern location. Conversely, if the unlicensed carrier is not contending, it continues to attempt to transmit on the next pattern (such as the third uplink subframe in Figure 5), depending on the LBT result before the subframe. If the UE fails to contend to the unlicensed carrier on the transmission pattern in the time window, the time window fails, the UE stops trying to transmit, and waits for the next time to be scheduled by the base station. If, in the process, the UE performs the LBT successfully before any position in the corresponding transmission pattern position, the uplink transmission is performed on the candidate transmission pattern position configured after the LBT is successfully executed, and the configured time window is also invalid.

For a new frame structure, that is, a flexible uplink and downlink subframe structure, the base station may indicate the uplink/downlink subframe ratio or attribute in advance, or the eNB performs the next subframe attribute indication in each subframe, or determines the subframe in other manners. Attributes. The UE may determine the location of the subframe to be transmitted according to the scheduled location and the pre-configured transmission pattern as above.

Optionally, the candidate transmission location pattern may also be unrestricted by the frame structure, that is, if some locations in the transmission pattern configured for the UE candidate correspond to a downlink subframe, or a special subframe, etc., the UE may hop. This type of sub-frame is passed, and an LBT/CCA operation is attempted before the next configured candidate location pattern to attempt an uplink transmission.

In addition to the foregoing method, the UE performs the LBT failure before scheduling the subframe, and can continue to perform the LBT until the usage right of the unlicensed carrier is successfully acquired, and the resource is transmitted on the resource after the LBT succeeds. The resource may be a partial subframe after the LBT succeeds, or the first complete subframe. The transmission start point of the resource may be a slot boundary, or a symbol boundary, or a subframe boundary. The blank between the LBT success time and the resource transmission start point may send a reservation signal or an occupation signal or an initial signal, which may be SRS or Preamble or indication information or carry information such as UE ID and/or operator ID.

For the case where there is a partial subframe in the uplink transmission, the elements in the candidate transmission set of the UE may be in units of slots or in units of symbol length. It is handled in the same way as above. In addition, the candidate transmission pattern may be configured by a time window nesting manner, or may be a candidate transmission subframe position formed by the candidate transmission pattern nesting manner.

It should be noted that the above methods can be used in combination with each other without conflict.

Embodiment 2:

In the preferred embodiment, when the UE performs uplink transmission on the candidate subframe provided by one of the methods in the first embodiment, the uplink transmission is performed in the candidate transmission subframe. A subframe coordination method between UEs is scheduled.

Assuming UE1 is scheduled in subframe 1, but does not compete for an unlicensed carrier before subframe 1, or LBT execution fails, UE1 may attempt to contend for the unlicensed carrier before the candidate subframe (eg, subframe 5), thereby Try to make an uplink transfer. Another UE, such as UE2, has been scheduled on the current subframe 5. In this case, the two UEs can be processed as follows:

Case 1: The UE1 of the candidate subframe retransmission and the UE2 of the subframe scheduling have different frequency domain resource locations. The current subframe is a candidate subframe for UE1 and a scheduled subframe for UE2.

If UE1 and UE2 perform LBT successfully to compete for an unlicensed carrier on the current subframe, UE1 and UE2 may transmit simultaneously. On the other hand, if UE1 and UE2 fail to contend for the unlicensed carrier in the current subframe, the UE1 may attempt to perform the retransmission or the LBT operation on the next candidate subframe provided by one of the methods described in the first embodiment. The UE2 can also perform channel access by using the candidate subframe position provided by the method in the foregoing embodiment to perform uplink transmission. If only one UE in UE1 and UE2 performs the LBT to successfully acquire the right to use the unlicensed carrier, the UE with successful LBT transmits on the current subframe. The UE that fails to perform the LBT continues to try to transmit at the candidate subframe position provided by the method in the foregoing Embodiment 1. Alternatively, the UE continues to perform the LBT until it successfully contends to the unlicensed carrier, and can transmit only in a partial subframe or a complete subframe after the LBT succeeds. Wherein, preferably, the transmission location is the first part or the complete subframe after the LBT succeeds. Here, preferably, the UE scheduled by the subframe has the priority of using the subframe, that is, the UE2 has a higher priority than the UE1, and the LBT detection starting point that is earlier than the UE1 may be configured for the UE2, or a simplified LBT is used. Configuration parameters or mechanisms, for example, UE2 performs only one CCA duration length (CCA duration length of 25us or 34us) CCA, while UE1 performs defer period+eCCA or direct eCCA procedure, preferably, N is configured as 3 or 4 or 5.

Case 2: The frequency domain resource locations of UE1 and UE2 partially overlap.

Similar to Case 1, UE1 and UE2 can transmit together if they perform LBT successfully to the unlicensed carrier, or preferentially guarantee UE2 transmission, so that UE1 can delay one subframe in the transmission candidate subframe, or randomly select One subframe, or, re-instructing one subframe, continues to attempt to perform LBT acquisition of unauthorized carrier usage rights for transmission. If both UE1 and UE2 do not compete for the unlicensed carrier, the retransmission attempt is performed on the candidate subframe provided according to one of the methods in Embodiment 1. If only one UE in UE1 and UE2 performs LBT successfully, the processing manner is as in case 1.

Case 3: The resource locations of UE1 and UE2 completely overlap.

If both UE1 and UE2 are successful in LBT, and the frequency domain resource locations are completely overlapped, the two UEs may be transmitted together by using MU-MIMO technology, or two existing simultaneous transmissions at the same resource location may be implemented by using existing musa technology. The data of the UEs is separated. If the two UEs perform the LBT unsuccessful, or only one UE performs the LBT successfully, and performs the LBT unsuccessful UE, the retransmission attempt may be performed on the candidate subframe provided by one of the methods in the foregoing Embodiment 1.

Embodiment 3:

In the preferred embodiment, when the UE performs the LBT failure before the scheduling subframe, and the uplink transmission is performed on the candidate subframe provided by one of the methods in the first embodiment, the candidate transmits the subframe. A resource coordination method between UEs is scheduled.

Similar to the case in the second embodiment, when the frequency domain resources of the UE1 and the UE2 are partially overlapped, the present embodiment may be processed in one of the following manners:

Manner 1: The UE that is not normally scheduled in this subframe uses idle resources for data transmission.

For the mode 1, the vacant resource may be a resource reserved by the eNB to the UE in the candidate subframe or the transmission pattern, or the eNB and the UE agree in advance, or are configured by the upper layer RRC, or are predefined. The vacant resources can be dynamic or semi-static notifications or configurations. For a certain UE, the idle resources in the candidate subframe may be shared by the same cell or UEs in the same carrier, or only the UE is exclusive.

FIG. 6 is a schematic diagram of a collision between a normal scheduling UE and a non-normally scheduled UE transmission resource according to an embodiment of the present invention. As shown in FIG. 6, the vacant resource of the UE1 in the candidate subframe is located in the subframe, and the resource location is (k, l). Where k is an OFDM symbol index in a subframe, and l is a subcarrier index or a PRB or RBG or subband index in the entire bandwidth.

It is assumed that the time-frequency domain resource block position of UE1 in a normal scheduling subframe (such as subframe 1) is: time domain from symbol index 2 (where the symbol start index number in the subframe starts from 0) to symbol 4, frequency domain Up from PRB index 5 to PRB index 9. The time-frequency domain resource block position of UE2 in a normal scheduling subframe (such as subframe index 2) is: time domain from symbol index 3 to symbol 5, and frequency domain from PRB index 7 to PRB index 15. The areas overlapped at this time are: time domain symbols 3 to 4, and frequency domain indexes from 7 to 9.

Based on the above assumptions, if both UE1 and UE2 are successfully contending, UE1 performs data transmission without knowing that a resource collision occurs with UE2. As a result, the eNB receives data and cannot decode normally due to severe interference, and the eNB may re-instruct the UE to perform retransmission. The retransmitted resource location may be a previously configured candidate subframe, or the eNB re-instructs, or attempts to retransmit on the new candidate resource; or, in order to avoid collision with the normally scheduled UE in the subframe, the UE1 The vacant resource configured in the candidate transmission subframe is transmitted.

If only one UE of UE1 and UE2 successfully contends for an unlicensed carrier, the UE that successfully occupies the channel performs normal transmission in the subframe. Preferably, the UE that is normally scheduled in this subframe has the priority of transmission in this subframe. It also needs to be configured to give priority to the channel. If the UE does not contend to the unlicensed carrier, it needs to try to retransmit on the candidate subframe according to the method in Embodiment 1. If neither UE competes for an unlicensed carrier, the method in Embodiment 1 is used.

Manner 2: A UE that is not normally scheduled in this subframe performs offsetting a time domain and/or a frequency domain amount in the subframe.

In the example of the mode 1, when both the UE1 and the UE2 contend for the unlicensed carrier, the UE1 can transmit the frequency domain location in the subframe in the source frequency domain in order to avoid collision with the UE2 that is normally scheduled in the subframe. An offset in the time domain and/or frequency domain is performed on the basis. In order to prevent the UE1 from performing the offset and causing the resource collision, the UE may be when the specific trigger indication is received, or according to the number of scheduled UEs in the scheduling subframe on the candidate resource notified by the advance eNB. The resource configuration situation is the time domain and/or frequency domain offset of the transmission resource. Preferably, the eNB may reasonably allocate resources of different time domain locations to the UEs in the subframe when allocating or indicating candidate transmission subframe positions or patterns for a certain UE. The frequency domain location of the UE in the candidate subframe may be the same as or different from the frequency domain location allocated on the scheduling subframe. The specific trigger may be triggered by a physical layer, or triggered by a high-level signaling, or the eNB may send an indication information that is scrambled by the UE ID.

Manner 3: The UE that is not normally scheduled in this subframe adopts the newly indicated resource.

That is, when the eNB configures candidate subframe location information for the UE, the candidate time domain and/or frequency domain resource location may also be configured. When the UE does not compete for the unlicensed carrier, the UE attempts to perform the LBT operation before the candidate subframe position. If the LBT is successfully executed, the UE may randomly select a location for transmission in the candidate frequency domain resource set. Or, select a fixed frequency domain resource for transmission. Optionally, data transmission may also be performed on fixed or candidate frequency domain resources on any candidate time domain resource location after the LBT succeeds. If the number of consecutive transmission failures of the UE on its fixed time domain and/or frequency domain resources reaches a preset threshold, and the last candidate location of the candidate resource set is not reached, the UE may be a fixed or candidate frequency domain resource in the remaining time domain resources. Attempting to re-competition the unlicensed carrier attempts to transmit.

If the UE does not configure the subsequent time-frequency domain resource set, the UE transmits on the candidate transmission subframe according to the frequency resource location allocated in the scheduling subframe.

Manner 4: UEs that are not normally scheduled in this subframe may retry transmission in a new subframe by using the methods described in

Embodiments

1 and 2. The time-frequency resource location can be unchanged.

Mode 5: The UE scheduled in this subframe can transmit data in the manner of modes 1 to 4.

Manner 6: When scheduling, the eNB allocates different frequency domain resources to UEs in the subframe as much as possible in the transmission pattern or the candidate scheduling subframe set.

Embodiment 4:

In the preferred embodiment, a method for processing channel fairness in a normal scheduling UE and a non-normally scheduled UE in a current subframe is proposed.

From the perspective of ensuring fairness between the normal scheduling UE and the abnormally scheduled UE, the two types of UEs need to be configured with the same LBT mechanism and/or parameters. For example, the same CCA starting point, the same random backoff value N, the same LBT mechanism and the parameter duration (eg, defer period or ICCA duration). However, because the geographical locations of the two UEs are different, it is difficult to ensure that the two UEs simultaneously acquire the right to use the unlicensed carrier even if the same LBT mechanism and parameters are configured. In principle, UEs with similar geographical locations are scheduled to ensure relative channel access fairness, and multiplexing between UEs in the same cell or in the same carrier can also be implemented. For example, UE1 is an abnormally scheduled UE in subframe 1, and UE2 is a normally scheduled UE in the subframe 1, regardless of whether the time-frequency resource locations allocated in the subframe overlap, completely overlap or not overlap, and UE1 and UE2 are configured. The same LBT mechanism, for example, LBT Cat4 (ie, defer period+eCCA process, the channel is busy in the slot, can not enter the defer period), the maximum CW value is 7, the minimum CW is 3, and the defer period duration is 16+n* The composition of the slot. Where n is a positive integer greater than one. In this embodiment, n is 1. The slot is 9us, and the channel states of UE1 and UE2 are similar. In addition, the time point at which the LBT starts is also the same, wherein the LBT region is executed for the uplink transmission with the subframe boundary alignment. To schedule the last K OFDM symbols in the previous subframe of the subframe. Preferably, K is 1 or 2. For the case where the uplink has a partial subframe, the UE performs the LBT region before the start of the transmission time (assuming that the total number of symbols that the UE can perform the LBT region is K), which may be the first K1 symbols of the scheduling subframe or the candidate subframe position and the latter. The area consisting of K2 symbols (where K1+K2 is equal to K), or the first K symbols. The two UEs perform LBT in the LBT area, and the UE that contends to the unlicensed carrier can transmit on the scheduling subframe or the candidate subframe. Otherwise, stop this transfer. If the candidate subframe or candidate transmission time window has not expired, the UE may also attempt to continue the transmission.

From the perspective of ensuring that the normally scheduled UE has a priority access channel, the normally scheduled UE needs to configure an LBT mechanism or parameter that simplifies or quickly accesses the channel than the abnormally scheduled UE. Alternatively, the same LBT mechanism and/or parameters are used, but the configured normal scheduling UE has a CCA detection starting position earlier than the abnormally scheduled UE. Alternatively, the two types of UEs randomly select their own CCA detection starting point in the configured LBT area. For example, the UE that is not normally scheduled may sequentially follow the simplified LBT mechanism or parameters on the candidate transmission subframes, where may be a simplified LBT mechanism, such as: LBT Cat4 (including defer period+eCCA (delay in eCCA process) Period defer period) <defer period+eCCA (eCCA process without delay period defer period) <eCCA (eCCA process delay period defer period) <eCCA (eCCA process no delay period defer period) <LBT Cat2 (CCA duration duration Long) <LBT Cat2 (CCA duration is shorter). It can also be the same LBT mechanism, which only simplifies the parameter configuration. For example, LBT Cat4, ie defer period+eCCA (the eCCA process has a delay period defer period, you can use defer in turn) The parameter value of the period duration and/or the decrement of the N value increases or increases the probability of accessing the channel. Based on this, the normally scheduled UE adopts a LBT mechanism or parameter that is more simplified than the LBT mechanism adopted by the non-normally scheduled UE. In addition, assuming that the configured LBT interval is divided into N shares, the normally scheduled UE configuration is 1/N earlier than the non-normally scheduled UE as the starting point of the CCA, thereby increasing the probability of accessing the channel.

From the perspective of increasing the access opportunity of the non-scheduled UE, or reducing the resource overhead, the UE that is not normally scheduled adopts the mechanism of the fast access channel before the subframe in which the UE is normally scheduled, that is, the LBT mechanism or parameter configuration is simplified compared with the normal scheduling UE. .

In addition, the frequency domain locations of the LBTs performed by different types of UEs may also be the same or different. For example, the normal scheduling UE and the abnormally scheduled UE resource locations do not overlap, and the LBT may be separately performed on the corresponding frequency domain resource, or the LBT may be performed on the intersection corresponding to the normal scheduling UE and the abnormal scheduling UE, or The normal scheduling UE and the abnormally scheduled UE respectively perform LBT on the CCA time-frequency domain detection pattern, or perform LBT according to the entire bandwidth.

If the resource locations of the normally scheduled UE and the abnormally scheduled UE partially overlap, an enhanced LBT mechanism may be adopted, that is, the CCA detection location is randomly selected, or a different CCA starting point is configured. The processing in the frequency domain is the same as above.

In addition, the simplified LBT involved in the present invention means that for the same LBT mechanism, the more simplified means that the competition window is smaller than the previously used competition window, or the parameters involved in the LBT process (for example, defer The period duration, or CCA detection duration, is configured for a smaller duration than the parameters used in the previous mechanism. For different LBT mechanisms. More simplified means, for example, that an LBT mechanism that is easier to access than before is used. For example, if the LBT Cat4 access channel fails previously, the LBT mechanism or parameters that are easier to access the channel than the LBT Cat4 (for example, a smaller contention window, or LBT Cat2 that is more accessible to the channel) will be used next time.

For the parameters or processes of the LBT mechanism involved in the present invention, reference may be made to the following contents:

Among them, the process of LBT Cat4 (ie, defer period+eCCA process) is roughly:

When the transmission device (eg, eNB or UE) detects that the channel is idle within the defer period, downlink transmission is possible. and / or,

After the transmission device (for example, the eNB or the UE) detects that the channel is idle in the defer period, the downlink or uplink transmission may be performed according to the following steps until the random backoff value N is decremented to zero.

S11: Set an initial random backoff value N.

The random backoff value N may be a number uniformly generated between [0, CWp] or randomly generated by the binomial distribution, or may be a base station indicating an N value or a predefined N value. CWp is a random number between CWmin and CWmax, where CWmin is a positive integer not less than 1, and CWmax is a maximum of 1024. Preferably, CWmax may be 1, 2, 3, 4, 5, 6, 7, 11, 15, 31, 63, 127, 255 or the like.

S12: Determine whether the current N value is greater than 0. If the result of the judgment N is greater than 0, the value of N is decremented by a certain number of operations.

Where: the specific number can be a base station configuration, or, predefined. Preferably, the specific number is 1, ie N=N-1 operation.

S13: The device detects the channel idle condition in the slot. If the channel is detected to be idle in the slot, the process proceeds to Step 4. Conversely, if the channel is detected to be busy in the slot, go to Step 5.

S14: It is determined whether the current N value is equal to 0. If it is equal to 0, the channel detection is stopped, and the use right of the unlicensed carrier is considered to be acquired. Conversely, if N is not equal to 0, then go to Step 2.

S15: Detecting channel idle condition in the defer period. If the channel is detected to be idle during the defer period, then go to Step 2. Conversely, if the channel is detected to be busy during the defer period, Step 5 is repeated. The defer period can have a fixed duration length plus n times the slot. n is a number greater than or equal to 0, and preferably n is 0, 1, 2, 3, and the like. The slot length is 9us and the fixed duration is 16us.

The flow of LBT Cat2 is roughly as follows: the CCA detection start time can be fixed, or dynamically variable, or randomly selected within a certain interval within a certain interval, or within a certain interval within a certain interval. Configure a fixed location. If the detection channel is busy from idle, and the continuous detection channel idle time is not less than the preset CCA duration length, the use right of the unlicensed carrier is considered to be acquired. For the present invention, preferably, the eNB sends the DCI to perform channel access using the LBT Cat2. The CCA duration may be 16us+n*slot duration, and n is an integer greater than or equal to 0. Preferably, n is 1, 2, 3, and the like. The slot length is 9us. That is, the CCA duration can be 16us, or 25us, 34us, etc., and can be 9us, or 4us.

The enhanced LBT Cat2 differs from the LBT Cat2 in that the starting point for CCA detection can be randomly selected over a certain period of time. It is advantageous for the fairness of the contention access channel between the asynchronous systems and the transmission equipment that causes the CCA detection starting point to compete for the access channel in advance. For example, suppose a certain time period is 10, which can be divided into 10 small segments, and each small segment occupies 1 copy. Then, the transmission device 1 can use the starting point of the third short segment of the 10 small segments as the starting point of its own CCA detection, and the transmission device 2 can be fixed. Configure the start of the 7th segment in the 10 segment as the starting point for your own CCA detection. That is, different transmission equipment can randomly select CCA inspection The starting point can also be fixed to different starting positions.

Direct eCCA process. That is, the eCCA process is composed of N slot processes, and when the slot detects that the channel is busy, enters the defer period or does not enter the defer period. N is a random backoff value, an integer randomly generated between [0, CWp], and an integer randomly generated by CWp between [CWmin, CWmax]. In addition, N may be indicated by the base station to the UE, or predefined. Preferably, N can be 1, 2, 3. The maximum contention window CWmax can be a positive integer between [1, 63]. The specific eCCA process is:

Step 1: Generate a random backoff value N.

Step 2: Determine if the current N is greater than 0. If it is greater than 0, proceed to step 3. If it is equal to 0, it is considered that the unauthorized carrier usage right is obtained. At this time, if the UE has not performed slot detection yet, or does not enter the eCCA process, the random backoff value N needs to be reset, and the process proceeds to step 1.

Step 3: The transmission device detects whether the channel is idle in the slot. If the channel is idle, it proceeds to step 4. Or, if it is detected that the channel is busy, enter the defer period, that is, step 5, or directly enter the defer period, and directly repeat step 3.

Step 4: Perform an N value decrement by a certain number of value operations. The certain number of values may be predefined, or indicated by the base station, or the base station and the UE agree in advance. Preferably, N = N-1. Go to step 2.

Step 5: Detect whether the channel is idle in the defer period. If the evaluation channel is idle, proceed to step 4. If the detection channel is busy, repeat step 5. The defer period is composed of 16 us+n*slot, and n is an integer greater than or equal to 0. Preferably, n is 0, 1, 2, 3, and the like. The slot length is 9us.

The steps and/or processes in the above several LBT mechanisms can be performed before and after the replacement and combined with each other without affecting.

In addition, the user equipment may perform the data transmission or the uplink transmission on the candidate transmission subframes, and may not perform the LBT mechanism, that is, the base station and the UE may predict or default which subframes the UE can data or perform uplink transmission. In this case, the candidate subframe in which the UE can transmit data or perform uplink transmission may not be occupied by the UE in the local cell or the UE in the same carrier, thereby causing the UE to send uplink data or perform uplink transmission, and the base station receives The base station indicates whether the UE can transmit uplink data or perform uplink transmission on each subframe or each candidate subframe. That is, the base station indicates that the current subframe of the UE is the same cell or the UE in the same carrier is occupying. The UE may perform data transmission or uplink transmission directly on the subframe without performing the LBT; or use the base station and the UE to predict or default which subframes the UE can transmit data or perform uplink transmission, and then combine the base station information. Let the indication determine in which subframe the data is transmitted or the uplink transmission; or the UE that has successfully occupied the channel between the same cell or the same operator informs other UEs of the information of the interaction (such as adopting D2D technology), so that other UEs do not need to use Perform LBT and directly use the resources of the already occupied UE to transmit its own data or perform uplink transmission;

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

Step S1: The first user equipment UE or the first user equipment group UE evaluates the CCA to compete for the unlicensed carrier according to the LBT mechanism or the idle channel.

Step S2: When the first UE or the first UE group does not contend for the unlicensed carrier on the scheduling subframe, try to re-competition the unlicensed carrier on the candidate transmission subframe;

Step S3: When the first UE or the UE group contends to the unlicensed carrier on the scheduling subframe or the candidate transmission subframe, the uplink transmission is performed on the current subframe.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

Claims

A data transmission method includes:

The first user equipment UE or the first user equipment group UE evaluates the CCA to compete for the unlicensed carrier according to the preset LBT mechanism or the idle channel;

When the first UE or the first UE group does not compete for an unlicensed carrier on the scheduling subframe, try to re-competition the unlicensed carrier on the candidate transmission subframe;

When the first UE or the UE group contends to the unlicensed carrier on the scheduling subframe or the candidate transmission subframe, the uplink transmission is performed on the current subframe.
The method according to claim 1, wherein the candidate transmission subframe is indicated by a base station eNB by scheduling information; or, a preset rule indication.
The method according to claim 2, wherein, when the candidate transmission subframe is indicated by the base station eNB by using scheduling information, the first UE or the first UE group performs uplink transmission on the candidate transmission subframe. ,include:

The first UE or the first UE group receives scheduling information sent by the eNB, and attempts to compete for an unlicensed carrier on a transmission subframe corresponding to a specific timing relationship.
The method of claim 3 wherein said specific timing relationship comprises:

The uplink scheduling grant information is sent on the subframe n, and the uplink transmission is in the subframe n+k, where the value of k is a value in the set of values.
The method of claim 4, wherein the value in the set of values is a positive integer greater than one.
The method according to claim 5, wherein when the first UE or the first UE group fails to perform LBT or CCA before the scheduling subframe corresponding to the timing relationship n+k, the method further includes :

The first UE or the first UE group shortens the value of k in the timing relationship;

The first UE or the first UE group determines a scheduling subframe position according to the value of the shortened k.
The method according to claim 6, wherein the shortened k has a value of 1, or, 2, or 3.
The method according to claim 5, wherein when the first UE or the first UE group fails to perform LBT or CCA before the scheduling subframe corresponding to the timing relationship n+k, the method further includes :

The first UE or the first UE group simplifies LBT mechanisms and/or parameters for competing for unlicensed carriers;

The first UE or the first UE group competes for the use rights of the unlicensed carrier according to the simplified LBT mechanism and/or parameters on the candidate scheduling subframe.
The method according to claim 2, wherein the preset rule comprises at least one of: a time domain offset, a candidate scheduling information set, and a transmission pattern.
The method of claim 9, wherein the time domain offset is determined by at least one of:

Pre-agreed by the eNB with the first UE or the first UE group;

Notifying, by the eNB, the first UE or the first UE group by using physical layer DCI signaling;

Notifying, by the eNB, the first UE or the first UE group by using a common downlink control information DCI;

Notified by high-level signaling;

Predefined.
The method according to claim 10, wherein when the transmission position of the candidate transmission subframe is indicated by a time domain offset, the first UE or the first UE group is on the candidate transmission subframe The uplink transmission includes:

The first UE or the first UE group performs the LBT or CCA to detect the use right of the contention unlicensed carrier before the subframe corresponding to the time domain offset;

When the first UE or the first UE group successfully contends to an unlicensed carrier, the first UE or the first UE group performs uplink transmission on a subframe corresponding to the time domain offset;

When the first UE or the first UE group does not contend to the unlicensed carrier, the first UE or the first UE group continues to try on the subframe corresponding to the time domain offset implicitly corresponding Competing for unlicensed carriers for uplink transmission.
The method of claim 11, wherein the time domain offset implicit corresponding candidate transmission subframe comprises at least one of the following:

And sequentially shifting backwards from the scheduling subframe to a subframe corresponding to the time domain offset;

And continuously continuing part or all of the subframes corresponding to the length of the time domain offset from the scheduling subframe;

All or a portion of the subframes corresponding to the duration of the time domain offset duration are continuously continued from the subframe in which the time domain offset is located.
The method of claim 12, wherein

When the first UE or the first UE group contends to an unlicensed carrier before any one of the candidate transmission subframes, the first UE or the first UE group is in a current transmission subframe. The uplink transmission is performed, where other candidate transmission subframe configurations except the current transmission subframe are invalid.
The method according to claim 9, wherein when the transmission position of the candidate transmission subframe is indicated by a candidate scheduling information set, the first UE or the first UE group performs on the candidate transmission subframe Uplink data transmission includes:

The first UE or the first UE group sequentially attempts to re-competition the unlicensed carrier on the time domain subframe resource corresponding to the candidate scheduling information set;

If the first time domain subframe resource in the candidate scheduling information set does not compete for the unlicensed carrier, The first UE or the first UE group stops uplink transmission on the first time domain subframe, and continues to be second after the corresponding first time domain subframe resource in the candidate scheduling information set. The right to compete for the unlicensed carrier before the time domain subframe resource;

If the one of the time domain subframe resources in the candidate scheduling information set contends to the unlicensed carrier, the first UE or the first UE group is performed on the current time domain subframe. Uplink transmission.
The method according to claim 9 or 14, wherein the candidate transmission pattern or candidate scheduling information set is determined by at least one of the following:

Pre-agreed by the eNB with the first UE or the first UE group;

Notifying, by the eNB, the first UE or the first UE group by using physical layer DCI signaling;

Notifying, by the eNB, the first UE or the first UE group by using a common downlink control information DCI;

Notified by high-level signaling;

Predefined.
The method of claim 15, wherein determining the parameters of the candidate transmission pattern comprises at least one of the following:

The candidate transmission resource starting position, the interval, the number of candidate transmission resources, the candidate transmission resource ending position, the candidate transmission resource starting position, and the time domain offset between the scheduling subframes.
The method according to claim 16, wherein when the transmission position of the candidate transmission subframe is indicated by a transmission pattern, the first UE or the first UE group performs uplink transmission on the candidate transmission subframe. include:

The first UE or the first UE group sequentially performs the LBT or CCA to detect the use right of the contention unlicensed carrier before the corresponding subframe in the transmission pattern;

If the first time domain subframe resource does not compete for the unlicensed carrier before the corresponding first time domain subframe resource in the transmission pattern, the first UE or the first UE group stops uplink transmission on the first time domain subframe And continuing to compete for the use rights of the unlicensed carrier before the second time domain subframe resource after the corresponding first time domain subframe resource in the transmission pattern;

If the first time zone subframe resource contends to the unlicensed carrier in the time domain subframe resource in the transmission pattern, the first UE or the first UE group performs uplink transmission on the current time domain subframe. .
The method according to any one of claims 1 to 17, wherein when the first UE fails to transmit on a scheduling subframe and attempts to retransmit on the candidate transmission subframe, the first UE and The situation between the second UEs that are normally scheduled on the candidate transmission subframe includes one of the following:

Case 1: The frequency domain resource location of the first UE and the second UE is different;

Case 2: the frequency domain resource location of the first UE and the second UE partially overlap;

Case 3: The frequency domain resource locations of the first UE and the second UE completely overlap.
The method according to claim 18, wherein when the situation between the first UE and the second UE is Case 1,

When the first UE and the second UE both contend for an unlicensed carrier, the first UE and the second UE simultaneously perform uplink transmission on the subframe;

When the first UE and the second UE do not compete for an unlicensed carrier, the first UE and the second UE attempt to re-competition the unlicensed carrier on the candidate transmission subframe;

If the candidate UE is contending for the unlicensed carrier, the first UE and/or the second UE perform uplink transmission on the current subframe.

When one of the first UE and the second UE contends to an unlicensed carrier, the UE contending for the unlicensed carrier performs uplink transmission on the current subframe; and does not compete for the unlicensed carrier before the current subframe. The UE continues to re-competition the unlicensed carrier on the candidate transmission subframe, and contends to the unlicensed carrier before the candidate transmission subframe, and performs uplink transmission on the current subframe.
The method of claim 18, wherein when the situation between the first UE and the second UE is Case 2,

When the first UE and the second UE compete for the unlicensed carrier at the same time, the first UE and the second UE perform uplink transmission on the current subframe; or

The second UE performs uplink transmission normally on the current subframe, and the first UE attempts to re-competition the unlicensed carrier on a specific subframe in the candidate subframe after the current subframe, or does not compete for unauthorized authorization. The carrier is transmitted directly.
The method according to claim 20, wherein the specific subframe comprises: a first candidate subframe among candidate subframes after a current subframe, or a randomly selected one of candidate transmission subframes after a current subframe A subframe, or a subframe determined by the base station and jointly determined by the candidate subframe after the current subframe.
The method of claim 18, wherein when the situation between the first UE and the second UE is Case 3,

When the first UE and the second UE simultaneously compete for an unlicensed carrier, and the frequency domain resource locations of the first UE and the second UE completely overlap, the first UE and the second UE The UE performs uplink transmission together by means of multi-user multiple input and multiple MU-MIMO; or uplink transmission by the new multiple access technology MUSA technology.
The method according to any one of claims 20 to 22, wherein, when the first UE and the second UE frequency domain resource overlap or collide, the resources of the first UE or the second UE include at least the following one:

Manner 1: The first UE or the second UE uses idle resources for data transmission;

Manner 2: The first UE or the second UE performs data transmission by using resources corresponding to a certain time domain and/or frequency domain quantity;

Manner 3: The first UE or the second UE adopts a newly indicated resource.
The method according to claim 23, wherein the idle resource comprises at least one of: resources reserved by the eNB to the first UE or the second UE in a candidate transmission subframe or a transmission pattern; or a resource that is previously agreed by the eNB with the first UE or the second UE; or a resource configured by a higher layer RRC; or a predefined resource.
The method according to claim 23, wherein the first UE or the second UE performs time domain and/or frequency domain offset by one of:

The physical layer DCI signaling triggers; or, the high layer signaling triggers; or the indication information of the first UE or the second UE identifier scrambling sent by the eNB is triggered.
The method according to any one of claims 18 to 25, wherein the LBT rule adopted between the first UE and the second UE comprises at least one of the following:

The second UE and the first UE are configured with the same LBT mechanism and/or parameters; or

The second UE is configured with a more simplified LBT mechanism or parameter than the first UE; or

The second UE configuration is earlier than the CCA detection start position of the first UE; or

The second UE and the first UE randomly select their own CCA detection starting point in the configured LBT region; or

The LBT mechanism or parameter adopted by the first UE or the second UE before the candidate transmission subframe is more simplified than the LBT mechanism or parameter used before the scheduling subframe.
A data transmission device is applied to the first user equipment UE or the first user equipment group UE side, and includes:

The first contention module is configured to evaluate the CCA to compete for the unlicensed carrier by listening to the LBT mechanism or the idle channel according to the preset;

a second contention module, configured to attempt to re-compete the unlicensed carrier on the candidate transmission subframe when the unlicensed carrier is not contending on the scheduling subframe;

The transmitting module is configured to perform uplink transmission on the current subframe when the first UE or the UE group contends to the unlicensed carrier on the scheduling subframe or the candidate transmission subframe.