CN106470502A

CN106470502A - A kind of scheduling of resource of the unauthorized frequency range of LTE, using method and device

Info

Publication number: CN106470502A
Application number: CN201510515999.8A
Authority: CN
Inventors: 柯颋; 刘建军; 侯雪颖; 沈晓冬; 童辉; 王锐
Original assignee: Chellona Mobile Communications Corp Cmcc
Current assignee: Chellona Mobile Communications Corp Cmcc
Priority date: 2015-08-20
Filing date: 2015-08-20
Publication date: 2017-03-01
Anticipated expiration: 2035-08-20
Also published as: CN106470502B

Abstract

The invention discloses a kind of scheduling of resource of the unauthorized frequency range of LTE, using method and device.Higher in order to solve the problems, such as the scheduling of UL present in prior art crash rate.The method is：The scheduled UE using identical running time-frequency resource is divided into multiple UE groups by base station, then, it is respectively each UE group and configure mutually different extra time of intercept, each UE is after obtaining channel access chance, continue to correspond in duration in extra time of intercept accordingly and carry out channel sense, at the end of intercepting, if still determining channel idle, execute channel access.So, can accomplish to make multiple UE chance of competitive channel access simultaneously by 1 scheduling, because the interference environment residing for different UE is different, thus the situation of the unlikely appearance all disturbed obstruction of all UE, thus the suitable UE that can have ready conditions eventually is successfully accessed channel, carrying out transmitting uplink data, thus effectively increasing UL to dispatch successfully hit rate, significantly improving the probability of success of UL transmission.

Description

Resource scheduling and using method and device for LTE (Long term evolution) unlicensed frequency band

Technical Field

The invention relates to the field of communication, in particular to a resource scheduling and using method and device for an LTE (long term evolution) unlicensed frequency band.

Background

With the rapid increase of data traffic in the mobile internet, it is becoming a development trend to use the Long Term Evolution (LTE) technology on the unlicensed frequency band. The unlicensed frequency band is open to all Radio Access Technologies (RATs) and all operators, and different operators have the same right to deploy respective RAT systems (e.g., WIFI and unlicensed spectrum LTE) on the unlicensed frequency band.

Since the sites deployed by different RAT operators are not subjected to interference coordination planning (e.g., site planning), the sites are not allowed to transmit traffic simultaneously, otherwise, a strong mutual interference phenomenon may be caused.

Similarly, even if the stations belong to the same RAT, interference coordination planning is not usually performed between systems deployed by different operators, and therefore, the stations are not allowed to transmit services simultaneously, otherwise, a strong mutual interference phenomenon is caused.

In order to enable different operators of different RAT systems or the same RAT system to compete for using an unlicensed frequency band in a fair and orderly manner without conflict (i.e., simultaneous traffic transmission is prohibited), a Listen Before Talk (LBT) mechanism is introduced, that is, Before data transmission is performed each time, a period of time is reserved for sensing a carrier, a Clear Channel Assessment (CCA) process is performed, data transmission is started when the carrier is sensed to be available, and the maximum duration is limited when data transmission is performed each time.

In addition, in order to ensure the reliability of service transmission on the unauthorized frequency band, the authorized frequency band can be adopted to assist the unauthorized frequency band to carry out service transmission, the reliability of the authorized frequency band is combined with the abundant bandwidth resources of the unauthorized frequency band, and the throughput of the system is improved while the reliability of service transmission is ensured. Specifically, in order to ensure the performance of LTE in the unlicensed frequency band, the current protocol requires that an LTE technology is used in the unlicensed frequency band by Carrier Aggregation (CA) or dual connectivity. In the CA mode, a carrier on an authorized frequency band is used as a main carrier, and a carrier on an unauthorized frequency band is used as an auxiliary carrier, so that an unauthorized Access mode (LAA) is implemented with the assistance of an authorized frequency band. In particular, in the unlicensed frequency band, in order to ensure that the unlicensed frequency band is used in a fair and orderly and non-conflicting manner with other RAT systems or other LAA operators, both a base station (eNB) and a User Equipment (UE) of the LAA system need to follow the LBT mechanism when transmitting traffic.

Because the LAA base stations deployed on the unlicensed spectrum and the WIFI stations are not configured with interference coordination planning, and interference coordination planning is not performed between LAA base stations deployed by different operators, in order to avoid a strong mutual interference phenomenon caused by simultaneous service transmission by these stations, an eNB and a UE of the LAA system need to follow an LBT mechanism when transmitting services, so as to ensure fair, ordered and conflict-free contention for use of the unlicensed frequency band between different RATs and different LAA operators.

UE uplink (Up Load) transmission belongs to opportunistic transmission, i.e. after the UE is UL scheduled, the UE may not successfully contend for the channel access opportunity each time. If the UE fails to successfully contend for the channel access opportunity, the UE will not transmit UL data on the scheduled subframe, which may cause unnecessary UL scheduling signaling overhead and may also cause waste of UL resources allocated by the eNB for the UE. Obviously, too high UL scheduling failure rate will significantly deteriorate the UL transmission performance of LAA.

There are 2 factors affecting the "UL scheduling failure rate", namely: 1) a location factor; 2) time factor. With time being the primary factor.

Position factor: because the eNB and the UE are located at different geographical positions, the blind idle states of the channels perceived by the eNB and the UE are different, namely CCA channel perception results made by the eNB and the UE do not have reciprocity;

time factor: in the LTE system, UL resources of a UE are allocated in advance by an eNB. Since the contention environment of the U-band channel is complex and variable, when the eNB sends the UL resource scheduling information to the UE (for example, at the subframe n), it cannot be predicted in advance whether the UE can contend for the channel access opportunity at the scheduled time (for example, at the subframe n + k). If the UE fails to successfully contend for the channel access opportunity at subframe n + k, the UL resource scheduling information transmitted at subframe n may be invalidated due to failure.

For example, assume that the eNB schedules UE1 for UL transmissions in advance. But there is an interferer (e.g., WIFI device) near UE1 and the interferer transmits data and occupies the channel for a period of time before and after the UL subframe for which UE1 is scheduled. At this point, the UE1 can only abandon the scheduled UL transmission this time.

However, there are no interferers in the vicinity of other UEs (e.g., UE2 and UE3) that are farther away from UE1, or these interferers do not use the channel for a period of time before and after the UL subframe that UE1 is scheduled. Thus, if the eNB does not schedule UE1, but instead schedules UE2 or UE3, UE2 or UE3 can successfully contend for this UL transmission opportunity.

Obviously, there is still a large room for performance improvement in order to improve the successful hit rate of UL scheduling.

Therefore, aiming at the problem of high failure rate of UL scheduling in the current unlicensed frequency band, the scheme researches a technology capable of effectively improving the success hit rate of UL scheduling.

Disclosure of Invention

The embodiment of the invention provides a resource scheduling and using method and device for an LTE (Long term evolution) unlicensed frequency band. The method is used for solving the problem of high UL scheduling failure rate in the prior art.

The embodiment of the invention provides the following specific technical scheme:

a resource scheduling method of an LTE unlicensed frequency band comprises the following steps:

the base station divides the UE scheduled to use the same time-frequency resource into a plurality of UE groups, wherein the interference value among the UE groups in one UE group is lower than a set threshold when the UE uses the same time-frequency resource;

the base station respectively configures different additional interception time for each UE group; the extra listening time obtained by one UE group is used for indicating all the UEs in the UE group to continue to carry out channel listening within the corresponding time length of the corresponding extra listening time after the LBT operation is carried out and a channel access opportunity is obtained, and when the listening is finished, if the channel is still determined to be idle, the channel access is carried out.

Preferably, the scheduling of the multiple UEs uses the same time-frequency resource, which means that the multiple UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and the multiple UEs are scheduled to use the same or different PRBs in the frequency domain.

Preferably, the channels between different UE groups are non-orthogonal, where the non-orthogonal refers to that if multiple UEs of the different UE groups use the same time-frequency resource, the interference value between the UEs is greater than or equal to a set threshold.

Preferably, one UE group includes one UE, or at least two UEs.

Preferably, further comprising:

the base station configures corresponding LBT interception time for each UE group, wherein the UE belonging to the same UE group has the same LBT interception time;

preferably, further comprising:

the extra listening time configured by the base station for any UE group is less than the minimum LBT listening time unit.

Preferably, further comprising:

the base station loads the extra interception time configuration information of each UE group in UL DCI and sends the information to each UE in the corresponding UE group; or,

the base station informs each UE in the corresponding UE group of the calculation initial value of the extra interception time configuration information of each UE group in advance through a high-level signaling, indicates each UE group to obtain the calculation initial value based on the obtained calculation initial value, and obtains the corresponding extra interception time configuration information by combining a preset calculation rule.

Preferably, the preset calculation rule is notified to each UE group by the base station through a high-level signaling in advance, or agreed by the base station side and the terminal side in advance.

Preferably, the calculation rule is:

extra listening time ═ f (initial value of calculation), where f () is a set function; and f (x) is not equal to f (y) and if x is not equal to y, wherein x and y are initial calculation values; or,

the additional interception time is f (initial calculation value), where f (x) is ax, x is the initial calculation value, and x belongs to [1,2, …, m ], ax belongs to a preset discrete value interval [ a1, a2, a3, …, am ].

Preferably, the calculation rule is:

extra listening time is g (initial value calculated, parameters set, … …), where g () is a set function based on a pseudo-random mode or polling mode change; g (x, set parameter, … …) ≠ g (y, set parameter, …), if x ≠ y, x, y are initial values for calculation; or,

extra listening time is g (initial value calculated, parameters set, … …), where g () is a set function based on a pseudo-random mode or polling mode change; and g (x, u1 … …) ═ av, x is a calculation initial value and belongs to [1,2, …, m ], av belongs to a preset discrete value interval [ a1, a2, a3, …, am ].

Preferably, further comprising:

the base station adopts a piece of UL DCI and schedules a group of same time frequency resources to a plurality of UE simultaneously, wherein the base station adopts a preset g-RNTI to scramble the UL DCI, and the g-RNTI is notified to the UE in advance through a high-level signaling, so that the UE descrambles a search space based on the g-RNTI when searching the DCI and determines to descramble and obtain the UL DCI and compete for channel access opportunities on the time frequency resources indicated by the UL DCI.

Preferably, further comprising:

after configuring different extra interception time for each UE group, the base station respectively adopts RNTI (radio network temporary identifier) pre-allocated for each UE to perform data descrambling at corresponding scheduled time-frequency resources, and judges that the UE corresponding to any RNTI is successfully accessed to a channel after determining that corresponding uplink data is obtained by adopting any RNTI; or,

after configuring different additional interception times for each UE group, the base station respectively adopts the cyclic shift demodulation reference signal OCC indexes pre-allocated to each UE to detect at the corresponding scheduled time frequency resources, and determines that the UE corresponding to any cyclic shift demodulation reference signal OCC index successfully accesses the channel after determining that any cyclic shift demodulation reference signal OCC index is detected; or,

after configuring different extra interception times for each UE group, the base station respectively adopts a cyclic shift demodulation reference signal (OCC) index which is pre-allocated to each UE to detect at a corresponding scheduled time frequency resource, determines that any cyclic shift demodulation reference signal (OCC) index is detected, continues to respectively adopt RNTIs which are pre-allocated to each UE in the plurality of UEs to descramble data at the time frequency resource and determines that the UE corresponding to any RNTI successfully accesses a channel after obtaining corresponding uplink data by adopting any RNTI; or,

and after configuring different extra interception time for each UE group, the base station descrambles the occupied signals by respectively adopting the scrambling code RNTI which is pre-allocated to each UE at the corresponding scheduled time-frequency resource, and judges that the UE corresponding to any RNTI is successfully accessed into the channel when determining that the appointed symbol in the occupied signals is obtained by adopting any RNTI.

A resource use method of an LTE unlicensed frequency band comprises the following steps:

the method comprises the steps that UE obtains extra interception time configured by a base station according to base station instructions, wherein the UE is divided into a UE group by the base station, and the interference value between the UE in the UE group is lower than a set threshold when the UE is scheduled to use the same time-frequency resource;

and after the LBT operation is executed and the channel access opportunity is obtained, the UE continues to perform channel interception within the corresponding time duration of the corresponding extra interception time, and when the interception is finished, if the channel is still determined to be idle, the channel access is executed.

Preferably, the scheduled UEs use the same time-frequency resource, which means that a plurality of UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and are scheduled to use the same or different physical resource blocks PRB in the frequency domain.

Preferably, further comprising:

and if the UE determines that the channel is occupied when the monitoring is finished, the channel access opportunity is abandoned.

Preferably, one UE group includes one UE, or at least two UEs.

Preferably, further comprising:

and the UE obtains the LBT interception time configured by the base station according to the indication of the base station, wherein each UE in one UE group to which the UE belongs is configured with the same LBT interception time.

Preferably, further comprising:

the extra listening time for the UE to obtain the base station configuration is less than the minimum LBT listening time unit.

Preferably, further comprising:

the UE obtains extra interception time configuration information according to UL DCI sent by the base station; or,

the UE obtains a calculation initial value of the extra interception time configuration information notified by the base station through a high-level signaling in advance, and obtains corresponding extra interception time configuration information by combining a preset calculation rule based on the obtained calculation initial value.

Preferably, the preset calculation rule is obtained by the UE through a high-level signaling sent by the base station, or is pre-agreed by the base station side and the terminal side.

Preferably, the calculation rule is:

Preferably, further comprising:

when UE searches DCI, descrambling the search space based on g-RNTI (radio network temporary identifier) pre-notified by a base station through high-level signaling, and competing for channel access opportunity on time-frequency resources indicated by UL DCI when determining that UL DCI is obtained by descrambling; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the g-RNTI is adopted by the base station to scramble the UL DCI.

An apparatus for scheduling resources in an LTE unlicensed frequency band, comprising:

the system comprises a dividing unit, a scheduling unit and a scheduling unit, wherein the dividing unit is used for dividing the UE which is scheduled to use the same time-frequency resource into a plurality of UE groups, and the interference value among the UEs in one UE group is lower than a set threshold when the UEs use the same time-frequency resource;

the scheduling unit is used for respectively configuring different additional interception time for each UE group; the extra listening time obtained by one UE group is used for indicating all the UEs in the UE group to continue to carry out channel listening within the corresponding time length of the corresponding extra listening time after the LBT operation is carried out and a channel access opportunity is obtained, and when the listening is finished, if the channel is still determined to be idle, the channel access is carried out.

Preferably, the scheduling unit is further configured to:

and scheduling a plurality of UEs to use the same time-frequency resource, namely scheduling the plurality of UEs to use the same subframe for transmitting uplink data in a time domain, and scheduling the plurality of UEs to use the same or different PRBs in a frequency domain.

Preferably, the different UE groups divided by the dividing unit are non-orthogonal to each other, where the non-orthogonal to the channel means that if multiple UEs in the different UE groups use the same time-frequency resource, the interference value between the UEs is greater than or equal to a set threshold.

Preferably, one UE group divided by the dividing unit includes one UE, or includes at least two UEs.

Preferably, the scheduling unit is further configured to:

respectively configuring corresponding LBT (local breakout time) interception time for each UE (user equipment) group, wherein the UEs belonging to the same UE group have the same LBT interception time;

preferably, the scheduling unit is further configured to:

the extra listening time configured for any one UE group is less than the minimum LBT listening time unit.

Preferably, the scheduling unit is further configured to:

carrying the extra interception time configuration information of each UE group in UL DCI, and sending the information to each UE in the corresponding UE group; or,

and notifying the calculation initial value of the extra interception time configuration information of each UE group to each UE in the corresponding UE group in advance through a high-level signaling, indicating each UE group to obtain the corresponding extra interception time configuration information based on the obtained calculation initial value and combining a preset calculation rule.

Preferably, the preset calculation rule is notified to each UE group by the scheduling unit through a high-level signaling in advance, or is agreed by the apparatus and the terminal side in advance.

Preferably, the calculation rule is:

Preferably, the scheduling unit is further configured to:

and a group of same time-frequency resources are simultaneously scheduled to a plurality of UE by adopting a piece of UL DCI, wherein the scheduling unit adopts a preset g-RNTI to scramble the UL DCI, and the g-RNTI is notified to the UE in advance through a high-level signaling, so that the UE descrambles a search space based on the g-RNTI when searching the DCI and determines to descramble and obtain the UL DCI and compete for channel access opportunities on the time-frequency resources indicated by the UL DCI.

Preferably, the scheduling unit is further configured to:

after configuring different extra monitoring time for each UE group, respectively descrambling data at corresponding scheduled time-frequency resources by using a scrambling code RNTI (radio network temporary identifier) pre-allocated to each UE, determining that the UE corresponding to any RNTI is successfully accessed to a channel after obtaining corresponding uplink data by using any RNTI; or,

after configuring different additional listening times for each UE group, respectively adopting cyclic shift demodulation reference signal (OCC) indexes pre-allocated to each UE to detect at corresponding scheduled time-frequency resources, and determining that the UE corresponding to any cyclic shift demodulation reference signal (OCC) index successfully accesses a channel after determining that any cyclic shift demodulation reference signal (OCC) index is detected; or,

respectively configuring different extra interception times for each UE group, respectively adopting cyclic shift demodulation reference signal (OCC) indexes pre-allocated for each UE to detect at corresponding scheduled time-frequency resources, continuously and respectively adopting RNTIs pre-allocated for each UE in the plurality of UEs to perform data descrambling at the time-frequency resources after determining that any cyclic shift demodulation reference signal (OCC) index is detected, and judging that the UE corresponding to any RNTI successfully accesses a channel after determining that any RNTI obtains corresponding uplink data; or,

and after configuring different extra monitoring time for each UE group, descrambling occupied signals at corresponding scheduled time-frequency resources by respectively adopting a scrambling code RNTI (radio network temporary identifier) which is pre-allocated for each UE, and judging that the UE corresponding to any RNTI is successfully accessed into a channel when determining that a designated symbol in the occupied signals is obtained by adopting any RNTI.

An apparatus for using resources of an LTE unlicensed frequency band, comprising:

the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring extra interception time configured by a base station according to the indication of the base station, the device is divided into a UE group by the base station, and the interference value between the UE in the UE group is lower than a set threshold when the UE is scheduled to use the same time-frequency resource;

and the access unit is used for continuing to perform channel interception within the corresponding time duration of the corresponding extra interception time after the LBT operation is executed and a channel access opportunity is obtained, and executing channel access if the channel is still determined to be idle after the interception is finished.

Preferably, the apparatus is scheduled to use the same time-frequency resource as other UEs, indicating that a plurality of UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and are scheduled to use the same or different PRBs in the frequency domain.

Preferably, the access unit is further configured to:

and if the channel is determined to be occupied at the end of the interception, abandoning the channel access opportunity.

Preferably, one UE group includes one UE, or at least two UEs.

Preferably, the obtaining unit is further configured to:

and obtaining the LBT listening time configured by the base station according to the indication of the base station, wherein each UE in one UE group to which the device belongs is configured with the same LBT listening time.

Preferably, the extra sensing time configured by the base station obtained by the obtaining unit is less than the minimum LBT sensing time unit.

Preferably, the obtaining unit is further configured to:

acquiring extra interception time configuration information according to UL DCI sent by a base station; or,

and obtaining a calculation initial value of the extra interception time configuration information notified by the base station through a high-level signaling in advance, and obtaining corresponding extra interception time configuration information by combining a preset calculation rule based on the obtained calculation initial value.

Preferably, the preset calculation rule is obtained by the obtaining unit through a high-level signaling sent by the base station, or is pre-agreed by the base station side and the device.

Preferably, the calculation rule is:

Preferably, the access unit is further configured to:

when DCI searching is carried out, descrambling is carried out on a searching space based on g-RNTI (radio network temporary identifier) which is notified in advance by a base station through high-level signaling, and when UL DCI is obtained through descrambling, channel access opportunities are competed on time-frequency resources indicated by the UL DCI; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the g-RNTI is adopted by the base station to scramble the UL DCI.

In the embodiment of the invention, a base station divides UE scheduled to use the same time-frequency resource into a plurality of UE groups, wherein the interference value among the UE groups in one UE group is lower than a set threshold when the same time-frequency resource is used, then, different extra monitoring time is respectively configured for each UE group, after each UE in each UE group executes LBT operation and obtains a channel access opportunity, channel monitoring is continuously carried out within the corresponding time length of the extra monitoring time, and when monitoring is finished, channel access is executed if the channel is still determined to be idle. Therefore, a plurality of UEs can simultaneously compete for channel access opportunities through 1-time scheduling, and because the interference environments of different UEs are different, the situation that all the UEs are blocked by interference is unlikely to occur, so that the UEs with proper conditions can successfully access the channel to perform uplink data transmission, the successful hit rate of UL scheduling is effectively improved, and the successful probability of UL transmission is remarkably improved.

Drawings

Fig. 1 is a flowchart illustrating an eNB performing resource scheduling in an unlicensed LTE frequency band according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a resource scheduling performed by an eNB on an unlicensed LTE frequency band by a UE according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an eNB functional structure according to an embodiment of the present invention;

fig. 4 is a functional structure diagram of a UE in an embodiment of the present invention.

Detailed Description

In order to solve the problem of high UL scheduling failure rate in the prior art, in the embodiment of the invention, when the eNB performs UL scheduling, a group of same time-frequency resources are scheduled to a plurality of UEs simultaneously for use; the eNB then enables only some of the UEs to simultaneously contend for the UL channel access opportunity through the interference coordination mechanism.

Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, in the embodiment of the present invention, a specific process of the eNB performing resource scheduling in the unlicensed frequency band is as follows:

step 100: the base station divides the UE scheduled to use the same time-frequency resource into a plurality of UE groups, wherein the interference value among the UE contained in one UE group is lower than a set threshold when the UE uses the same time-frequency resource.

The scheduled use of the same time-frequency Resource means that the UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and may be scheduled to use the same or different Physical Resource blocks (Physical Resource blocks) in the frequency domain, that is, may overlap in the frequency domain, or may be completely the same.

One UE group may include only one UE, or may include two or more UEs, which may also be referred to as multiple UEs.

On the other hand, when the UEs in a UE group use the same time-frequency resource, the interference value between the UEs is lower than the set threshold, which may be specifically implemented in the following two ways:

the first mode is as follows: the channels between the UEs included in one UE group are orthogonal (i.e. the channels between the UEs are independent of each other), and the channel non-orthogonality refers to that if a plurality of UEs in the different UE groups use the same time-frequency resource, the interference value between each other is greater than or equal to a set threshold. In this case, the interference value between UEs belonging to the same UE group using the same time-frequency resource is necessarily lower than the set threshold.

The second way is: in the case that the channels of the UEs included in one UE group are non-orthogonal, that is, the channels of the UEs are not independent of each other, it is further required to ensure that the UEs are divided into UE groups

And when the same time-frequency resource is used among the UEs belonging to the same UE group, the interference value among the UEs is lower than a set threshold.

Further, the channels between different UE groups may be non-orthogonal, and since only one UE group may compete for the channel access opportunity, transmission interference between the UE groups may not be caused. When only one UE is included in one UE group, the base station schedules the same time-frequency resource to different UE groups, which is equivalent to simultaneously schedule the same time-frequency resource to different UEs with non-orthogonal channels for use.

Step 110: the base station respectively configures different additional interception time for each UE group; the extra listening time obtained by one UE group is used for indicating all the UEs in the UE group to continue to carry out channel listening within the corresponding time length of the corresponding extra listening time after the LBT operation is carried out and a channel access opportunity is obtained, and when the listening is finished, if the channel is still determined to be idle, the channel access is carried out.

Since the extra sensing time obtained by each UE group is different from each other, even if two UE groups simultaneously obtain channel access opportunities after performing LBT operation, it is ensured that at most one UE group actually accesses the channel after performing different extra sensing times.

After a certain UE group is actually accessed to a channel, the channel is occupied to send uplink signals, and because the interference value between the UEs in the UE group when using the same time-frequency resource is lower than a set threshold, even if the UEs are simultaneously accessed to the channel, the UEs do not interfere with each other.

On the other hand, if each UE in one UE group performs channel sensing within the time duration corresponding to the corresponding extra sensing time, and when sensing is finished, it is determined that the channel is occupied, the UE in the one UE group will give up the access opportunity and wait for the next access opportunity.

Further, the base station may configure corresponding LBT listening time for each UE group, wherein UEs belonging to the same UE group have the same LBT listening time, that is, UEs in the same UE group have not only the same additional listening time but also the same LBT listening time.

Preferably, the additional listening time configured by the base station for any UE group is less than the minimum LBT listening time unit (e.g., single ECCA listening time, i.e., CCA backoff slot) for any UE group.

On the other hand, in order to implement an inter-group interference coordination mechanism, in the embodiment of the present invention, the eNB needs to configure different additional listening times for different UE groups, and the eNB may notify the UE of configuration information of the additional listening times in several ways, which are not limited to the following:

in the first case: the base station loads the extra listening time configuration information of each UE group into uplink scheduling downlink control information (UL DCI), and updates the information and sends the information to each UE in the corresponding UE group during each scheduling.

In the second case: the base station informs each UE in the corresponding UE group of the calculation initial value of the extra interception time configuration information of each UE group in advance through a high-level signaling, indicates each UE group to obtain the calculation initial value based on the obtained calculation initial value, and obtains the corresponding extra interception time configuration information by combining a preset calculation rule. The preset calculation rule may be notified to each UE group by the base station through a high-level signaling in advance, or may be predetermined by the base station side and the terminal side, for example, the predetermined manner includes, but is not limited to, a standardized means.

Preferably, the value of the extra listening time obtained based on the calculation rule may be relatively fixed, or based on the change of the setting rule with time, when the UE calculates the specific extra listening time, it is not necessary to temporarily interact with extra signaling.

Each will be described in detail below.

In the first scenario, the value of the extra listening time is relatively fixed, which is usually applied to a scenario with a specific priority. For example, assuming that the channel access priority of UE group a is higher than the channel access priority of UE group B, the base station configures a shorter extra listening time for UE group a. In another example, if a UE group with a larger number of UEs has a higher channel access priority, the base station configures a shorter additional listening time for such UE groups.

For example, the base station assigns different extra sensing time seeds (i.e., the initial calculation values) to each UE group, and the actual value of the extra sensing time is calculated from the extra sensing time seeds.

If, the calculation rule is: an extra sensing time ═ f (extra sensing time seed), where f () is a set function; and has the characteristics that: f (x) ≠ f (y), if x ≠ y, where x and y are extra snoop time seeds (i.e., the initial value of the above calculation).

For another example: an extra sensing time f (extra sensing time seed), where f (x) ax, x is an initial value for calculation, and x belongs to [1,2, …, m ], and let; in this case, the value of the extra sensing time is a value in a discrete time set, such as: the additional interception time epsilon [ a1, a2, a3, …, am ], wherein 0 is more than or equal to a1< a2< a3< … < am < ordinary LBT interception time.

In the second scenario, the value of the extra sensing time varies with time, which is usually applied to a fair scenario, that is, different UE groups have the same channel access opportunity in the sense of statistical averaging. For example, at time t1, the extra listening time for UE group a is less than the extra listening time for UE group B, but at the next time t2, the extra listening time for UE group a may be greater than the extra listening time for UE group B. In particular, the law of the variation of the extra listening time over time may be pseudo-random or follow a certain law, such as a polling rule.

For example: the base station gives different extra sensing time seeds (i.e. the initial calculation values) to each UE group, and the actual value of the extra sensing time is calculated from the extra sensing time seeds.

extra listening time is g (initial value calculated, parameters set, … …), where g () is a set function based on a pseudo-random mode or polling mode change; g (x, u1 … …) ═ a_vX is the initial value of calculation and x ∈ [1,2, …, m]，a_v∈ discrete value range [ a1, a2, a3, …, am]

Wherein, setting the parameters may include: the parameters related to the current time, such as the radio frame number, the subframe number, and the slot number, may also include parameters related to the environment, such as the cell number.

For example, the extra sensing time is g (extra sensing time seed, current subframe number), or the extra sensing time is g (extra sensing time seed, current subframe number, current radio frame number), or the extra sensing time is g (extra sensing time seed, current radio frame number), where g () is a set function; and has the characteristics that: g (x, u1, u2, …) ≠ g (y, u1, u2, …), if x ≠ y, where x and y are extra listen time seeds (i.e. the initial values of the above calculation), and u1, u2, … are preset fixed parameters, such as the current subframe number and the current radio frame number; in particular, the time-varying rule of g (x, u1, u2, …) may be pseudo-random or may follow a certain rule, such as a polling rule.

Also, for example, the extra sensing time is g (extra sensing time seed, current subframe number), or the extra sensing time is g (extra sensing time seed, current subframe number, current radio frame number), or the extra sensing time is g (extra sensing time seed, current radio frame number), where g () is a set function; let g (x, u1 … …) ═ av, [ e.g., g (x, u1) ═ av, or g (x, u1, u2) ═ av, … … ], where x is an additional listen time seed (i.e., the initial value of the above calculation) and x ∈ [1,2, …, m ], av ∈ a preset discrete value interval [ a1, a2, a3, …, am ]; wherein,

for the pseudo-random pattern, let g (x, u1) be a_vWherein v ═ x + h (u1) -1)mod m]+1, or, let g (x, u1, u2) ═ av, where v ═ [ (x + h (d (u1, u2)) -1) mod m]+1, where h is a predetermined pseudo-random function, such as following a uniform distribution, a normal distribution, or other distribution pattern, or generated by a cyclic shift sequence, or generated by a Gold sequence, or generated by another pseudo-random sequence, etc.; and d (u1, u2) may be any function, such as d (u1, u2) ═ u1+ u2, or d (u1, u2) ═ u 12, and so on.

For polling mode, let g (x, u1) be a_vWherein v ═ [ (x + u1-1) mod m]+ 1; h or g (x, u1, u2) ═ a_vWherein v ═ [ (x + u1+ u2-1) mod m]+1。

Furthermore, in the embodiment of the present invention, when the eNB performs UL scheduling, a group of the same time-frequency resources are scheduled to a plurality of UEs at the same time, and in particular, in order to improve UL scheduling efficiency, the eNB may introduce a group scheduling mechanism, that is, a UL DCI is used, and a group of the same time-frequency resources are scheduled to a plurality of UEs at the same time, where a new scrambling code, i.e., a group scheduling scrambling code (g-RNTI), may be defined, and the eNB scrambles the UL DCI using the g-RNTI and notifies the g-RNTI to the UEs in advance through a high-level signaling, so that when the UE searches for DCI, the UE descrambles a search space based on the g-RNTI, and determines that when the UL DCI is obtained through descrambling, the UE competes for a channel access opportunity on the time-frequency resources indicated by the UL DCI.

It should be noted that the so-called "group" in the group modulation scrambling code is not the same concept as the previous UE group, and refers to "all UEs using the same time-frequency resource", i.e. all UE groups are included.

Furthermore, in the embodiment of the present invention, when the eNB performs UL scheduling, a group of same time-frequency resources are scheduled to a plurality of UEs at the same time for use, and in particular, to improve the UL scheduling efficiency, a long-acting UL scheduling mechanism may be introduced, so that the eNB may flexibly schedule UL transmission resources for the UEs without worrying about UL scheduling failure due to the fact that the UEs cannot compete for the channel. Specifically, in the embodiment of the present invention, the base station divides a plurality of UEs scheduled to use the same time-frequency resource into a plurality of UE groups according to the channel independence characteristics, so that channels between different UEs in the same UE group are independent of each other, and the eNB configures the UEs belonging to different UE groups to have different extra listening times; then, after the eNB determines that any UE group obtains the channel access opportunity, and after any UE in the any UE group completes uplink data transmission, another UE conforming to the channel independence characteristic is reselected to replace the any UE.

For example, assuming that UEy in UE group x successfully contends for the channel access opportunity and completes UL data transmission, the eNB may select another UEz to replace UEy of the UE group, and the newly joined UEz also needs to satisfy the channel independence feature in UE group x, i.e. the channels are independent from each other between UEs.

On the other hand, in the embodiment of the invention, when the eNB carries out UL scheduling, a group of same time-frequency resources are scheduled to a plurality of UEs simultaneously for use, and only part of the UEs can compete for the UL channel access opportunity simultaneously through an interference coordination mechanism, and on the specific time-frequency resources, the eNB needs to know whether the UEs obtain the UL transmission opportunity and which UEs actually obtain the UL transmission opportunity; for this problem, but not limited to, the following solutions can be adopted:

the first solution is: after respectively configuring different extra listening time for each UE group, the eNB respectively adopts a modulation scrambling code (RNTI) which is pre-allocated for each UE to perform data descrambling at the corresponding scheduled time-frequency resource (namely the same time-frequency resource which is scheduled and used by each UE, and is not repeated below), and after determining that corresponding uplink data is obtained by adopting any RNTI, judges that the UE corresponding to the any RNTI is successfully accessed to a channel.

When the first solution is used, the detection is actually performed by using a U-band Physical Uplink Shared Channel (U-band PUSCH) on the eNB side, that is, when the UE having a successful access Channel transmits Uplink data, the UE is scrambled by using an RNTI allocated by the eNB through a high layer signaling in advance; and the eNB descrambles the data by adopting the RNTI which is distributed for each UE in advance at each possible time-frequency resource position, and if uplink data can be descrambled successfully by adopting a certain RNTI, the corresponding UE can be declared to compete to channel resources.

The second solution is: after configuring different additional listening times for each UE group, respectively configuring, by the eNB, at a corresponding scheduled time-frequency resource, detecting by respectively adopting Cyclic shift demodulation reference signals (OCC indexes) pre-allocated to each UE, determining that any Cyclic shift for DMRS and OCC index is detected, and then determining that the UE corresponding to the any Cyclic shift for DMRS and OCC index successfully accesses a channel.

When the second solution is used, the U-band UL DMRS detection on the eNB side is actually adopted, that is, the eNB side performs blind detection on DMRSs (or other RSs) in the U-band PUSCH to speed up the determination of whether the UE competes for the channel resources. Namely, the UE successfully accessing the channel transmits UL DMRS to the eNB, and the signal sequence of the UL DMRS is determined by a Cyclic shift for DMRS and OCC index field in the UL DCI transmitted by the eNB through high-layer signaling. And the Cyclic shift for DM RS and OCC index technology supports multiplexing of 8 UEs at maximum, so if the Cyclic shift for DMRS and OCC index of the UE called to use the same time-frequency resource are different, the eNB can uniquely distinguish which UE gets the channel access opportunity.

The third solution is: respectively configuring mutually different extra interception time for each UE group by the eNB, respectively adopting Cyclic shift for DM RS and OCC index pre-allocated for each UE at the corresponding scheduled time-frequency resource, detecting by using the RNTI pre-allocated for each UE at the time-frequency resource, continuously and respectively adopting the RNTI pre-allocated for each UE in the plurality of UEs to perform data descrambling at the time-frequency resource after determining that any Cyclic shift for DMRS and OCC index is detected, and judging that the UE corresponding to any RNTI is successfully accessed to a channel after determining that any RNTI is adopted to obtain corresponding uplink data; or,

when the third solution is used, a combination of eNB-side U-band UL DMRS detection and eNB-side U-band PUSCH detection is actually employed. That is, if the Cyclic shift for DM RS and OCC index fields of UEs scheduled to use the same time-frequency resource may be repeated (e.g., the number of UEs scheduled to use the same time-frequency resource is greater than 8), the eNB first reduces the possible UE search range through U-band UL DMRS detection, and then uniquely distinguishes which UE obtains a channel access opportunity through demodulation of U-band PUSCH if there is still uncertainty.

The fourth solution is: and after respectively configuring different extra interception time for each UE group, the eNB respectively adopts RNTI (radio network temporary identifier) pre-allocated to each UE to descramble occupied signals (preamble) at corresponding scheduled time-frequency resources, and judges that the UE corresponding to any RNTI is successfully accessed into a channel when determining that the appointed symbol in the preamble is obtained by adopting any RNTI.

When the fourth solution is used, it is actually based on the indication in the UL preamble, i.e. let a specific part (e.g. symbol) in the UL preamble be scrambled by the RNTI. When the UE competes for the channel access opportunity, a segment of preamble is sent for occupation, the eNB uses the RNTI which is notified to each UE in advance through a high-level signaling to demodulate a specific symbol in the corresponding preamble, and if the demodulation is successful, the UE with the specific symbol obtains the channel access opportunity.

In the above embodiment, when the U-band UL DMRS detection technology based on the eNB side is adopted, the eNB configures different Cyclic shift for DM RS and OCC index for multiple UEs scheduled to use the same time-frequency resource as much as possible, but if the number of UEs is greater than the reuse degree (e.g. 8) of the Cyclic shift for DMRS and OCCindex fields, it is at least required to ensure that different UEs in the UE group having the same extra sensing time have different Cyclic shift for DM RS and OCC index; the Cyclic shift for DM RS and OCC index of the UEs in different UE groups may be the same or different, and the description thereof will not be repeated.

Referring to fig. 2, in the embodiment of the present invention, a specific process of the UE performing resource scheduling by the eNB in the unlicensed frequency band is as follows:

step 200: and the UE obtains the extra interception time configured by the base station according to the indication of the base station, wherein the UE is divided into a UE group by the base station, and the interference value between the UE in the UE group is lower than a set threshold when the UE is scheduled to use the same time-frequency resource.

The scheduled use of the same time-frequency resource means that a plurality of UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and are scheduled to use the same or different PRBs in the frequency domain.

the first mode is as follows: in this case, the interference values between UEs belonging to the same UE group using the same time-frequency resource are necessarily lower than the set threshold.

Step 210: and after the LBT operation is executed and the channel access opportunity is obtained, the UE continues to perform channel interception within the corresponding time length of the corresponding extra interception time, and when the interception is finished, if the channel is still determined to be idle, the channel access is executed.

Correspondingly, if the UE determines that the channel is occupied at the end of the listening, the UE gives up the channel access opportunity.

Further, if the UE gives up the current channel access opportunity, the next time the LBT operation is performed, the following three methods are adopted, but not limited to:

the first mode is as follows: and restarting the contention channel access opportunity from the time when the backoff counter is 0.

Several concepts are defined in LBT, an initial latency T1 (one time unit, which may be equal to 0), a CCA backoff slot T2.

LBT generally consists of the following steps:

1) when a node prepares to access a channel, a backspacing timer N is initialized firstly, wherein N is a random number, and the maximum value does not exceed a backspacing window CW; turning to step 2)

2) The node carries out CCA channel interception, and when the idle time of the channel is found to reach the initial waiting time T1, the step 3 is carried out

3) The node continues to perform CCA channel sensing, and when the discovery channel idle time reaches the CCA backoff slot T2, the value of the backoff timer N is decreased by 1 (i.e., N-). If N has not been reduced to 0, continuing to execute step 3); otherwise, if the value of N is reduced to 0, it indicates that the node successfully competes for the channel access opportunity through the LBT mechanism, and the node can transmit data.

4) In the steps 2) and 3), if the node finds that the channel is already occupied by another node in the CCA process, the node returns to step 2) again, that is, the node waits for the channel to be completely idle for the initial waiting time T1 before continuing the subsequent steps.

In step 1) above, the value of the backoff window CW may also be varied. Generally, CW values have a range of values: CW belongs to [ minimum backoff window Cwmin, maximum backoff window Cwmas ]. One commonly used backoff window CW adjustment strategy is: if the node determines that a channel access opportunity was obtained and transmission failed when the node last performed LBT operation, the backoff window CW value is increased, e.g., CW may be doubled, i.e., CW:min {2 × CW, CWmax }. On the contrary, if the node decides that the channel access opportunity was obtained and the transmission was successful when the last LBT operation was performed, the backoff window CW value is reset to the minimum value, i.e.: CW: CWmin.

The second way is: it is determined that the channel access opportunity was obtained and transmission failed the last time the LBT operation was performed, and the channel access opportunity is re-contended.

The third mode is as follows: and judging that the channel access opportunity is obtained and transmitted successfully when the LBT operation is carried out last time, and re-competing for the channel access opportunity.

Therefore, the second and third modes differ in that: different ways are used to adjust the size of the backoff window CW in the LBT mechanism.

Further, the UE may further obtain the LBT listening time configured by the base station according to the indication of the base station, where each UE in one UE group to which the UE belongs is configured with the same LBT listening time, that is, each UE in the same UE group has not only the same extra listening time but also the same LBT listening time. Preferably, the extra listening time of the base station configuration obtained by the UE is less than the normal LBT listening time (e.g., single ECCA listening time) of the base station configuration obtained by the UE. Preferably, the value of the extra sensing time may be a value in a discrete time set, such as: the additional interception time epsilon [ a1, a2, a3, …, am ], wherein 0 is more than or equal to a1< a2< a3< … < am < ordinary LBT interception time.

In the embodiment of the present invention, to better implement an inter-group interference coordination mechanism, the UE may obtain configuration information of extra listening time notified by the eNB by using, but not limited to, the following ways, specifically:

1. and the UE acquires the extra interception time configuration information according to the UL DCI sent by the base station.

2. The UE obtains a calculation initial value of the extra interception time configuration information notified by the base station through a high-level signaling in advance, and obtains corresponding extra interception time configuration information by combining a preset calculation rule based on the obtained calculation initial value. The preset calculation rule may be obtained by the UE from a high layer signaling sent by the base station in advance, or may be predetermined by the base station side and the terminal side.

Preferably, the value of the extra listening time obtained based on the above calculation rule may be relatively fixed, or may change with time based on a set rule.

Each will be described in detail below.

In the first scenario, the value of the extra listening time is relatively fixed, which is usually applied to a scenario with a specific priority. For example, assuming that the channel access priority of UE group a is higher than the channel access priority of UE group B, the base station configures a shorter extra listening time for UE group a. In another example, a UE group with a higher number of UEs is given a higher channel access priority, and the base station configures a shorter additional listening time for such UE groups.

extra listening time is g (initial value calculated, parameters set, … …), where g () is a set function based on a pseudo-random mode or polling mode change; g (x, u1 … …) ═ av, x is the initial value of calculation and x belongs to [1,2, …, m ], av belongs to the preset discrete value interval [ a1, a2, a3, …, am ]

for the pseudo-random pattern, let g (x, u1) ═ av, where v ═ [ (x + h (u1) -1) mod m ] +1, or let g (x, u1, u2) ═ av, where v ═ h [ (x + h (d (u1, u2)) -1) mod m ] +1, where h is a preset pseudo-random function, such as following a uniform distribution, a normal distribution, or other distribution pattern, or generated by a cyclic shift sequence, or generated by a Gold sequence, or generated by other pseudo-random sequence, etc.; and d (u1, u2) may be any function, such as d (u1, u2) ═ u1+ u2, or d (u1, u2) ═ u 12, and so on.

For polling mode, let g (x, u1) ═ av, where v ═ [ (x + u1-1) mod m ] + 1; h or let g (x, u1, u2) ═ av, where v ═ [ (x + u1+ u2-1) mod m ] + 1.

When UE searches DCI, descrambling the search space based on g-RNTI (radio network temporary identifier) pre-notified by a base station through high-level signaling, and determining that the UE competes for channel access opportunity on time-frequency resources indicated by UL DCI when descrambling to obtain the UL DCI; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the base station scrambles the UL DCI by adopting the g-RNTI.

Based on the above embodiments, referring to fig. 3, in the embodiment of the present invention, a base station includes a dividing unit 30 and a scheduling unit 31:

a dividing unit 30, configured to divide UEs scheduled to use the same time-frequency resource into multiple UE groups, where an interference value between UEs in one UE group using the same time-frequency resource is lower than a set threshold;

a scheduling unit 31, configured to configure different additional listening times for each UE group; the extra listening time obtained by one UE group is used for indicating all the UEs in one UE group to continue to carry out channel listening within the corresponding time length of the corresponding extra listening time after the LBT operation is carried out and a channel access opportunity is obtained, and when the listening is finished, if the channel is still determined to be idle, the channel access is carried out.

Preferably, the scheduling unit 31 is further configured to:

Preferably, the different UE groups divided by the dividing unit 30 are non-orthogonal to each other, where the non-orthogonal to the channel means that if a plurality of UEs in different UE groups use the same time-frequency resource, the interference value between the UEs is greater than or equal to the set threshold.

Preferably, one UE group divided by the dividing unit 30 includes one UE, or at least two UEs.

Preferably, the scheduling unit 31 is further configured to:

preferably, the scheduling unit 31 is further configured to:

Preferably, the scheduling unit 31 is further configured to:

Preferably, the preset calculation rule is notified to each UE group by the scheduling unit 31 through a high-layer signaling in advance, or is predetermined by the base station side and the terminal side.

Preferably, the calculation rule is:

Preferably, the scheduling unit 31 is further configured to:

and a group of same time frequency resources are simultaneously scheduled to a plurality of UE by adopting a piece of UL DCI, wherein a scheduling unit scrambles the UL DCI by adopting a preset group modulation scrambling code g-RNTI and informs the g-RNTI to the UE in advance through a high-level signaling, so that the UE descrambles a search space based on the g-RNTI when searching the DCI and determines to compete for channel access opportunities on the time frequency resources indicated by the UL DCI when descrambling to obtain the UL DCI.

Preferably, the scheduling unit 31 is further configured to:

respectively configuring different extra monitoring time for each UE group, respectively descrambling data at a corresponding scheduled time-frequency resource by using a scrambling code RNTI (radio network temporary identifier) pre-allocated to each UE, determining that the corresponding uplink data is obtained by using any RNTI, and then judging that the UE corresponding to any RNTI is successfully accessed to a channel; or,

after configuring different additional interception times for each UE group, respectively adopting cyclic shift demodulation reference signal (OCC) indexes pre-allocated to each UE to detect at corresponding scheduled time-frequency resources, and judging that the UE corresponding to any cyclic shift demodulation reference signal (OCC) index successfully accesses a channel after determining that any cyclic shift demodulation reference signal (OCC) index is detected; or,

respectively configuring different extra monitoring time for each UE group, respectively adopting cyclic shift demodulation reference signal (OCC) indexes pre-allocated for each UE to detect at corresponding scheduled time-frequency resources, continuously and respectively adopting RNTIs (radio network temporary identities) pre-allocated for each UE to perform data descrambling at the time-frequency resources for a plurality of UEs corresponding to any cyclic shift demodulation reference signal (OCC) index after determining that any cyclic shift demodulation reference signal (OCC) index is detected, and judging that any corresponding UE successfully accesses to a channel after determining that any RNTI is adopted to obtain corresponding uplink data; or,

after configuring different extra listening time for each UE group, descrambling occupied signals at corresponding scheduled time-frequency resources by respectively adopting a scrambling code RNTI pre-allocated for each UE, and judging that the UE corresponding to any RNTI is successfully accessed into a channel when determining that a designated symbol in the occupied signals is obtained by adopting any RNTI.

Based on the above embodiments, referring to fig. 4, in the embodiment of the present invention, the UE includes an obtaining unit 40 and an accessing unit 41, wherein,

an obtaining unit 40, configured to obtain extra listening time configured by a base station according to an indication of the base station, where the UEs are divided into a UE group by the base station, and an interference value between UEs in the UE group when the UEs are scheduled to use the same time-frequency resource is lower than a set threshold;

and an accessing unit 41, configured to continue to perform channel sensing within a time duration corresponding to the corresponding extra sensing time after the LBT operation is performed and a channel access opportunity is obtained, and perform channel access if it is still determined that the channel is idle after sensing is completed.

Preferably, the UE is scheduled to use the same time-frequency resource as other UEs, which means that a plurality of UEs are scheduled to use the same subframe for transmitting uplink data in the time domain, and are scheduled to use the same or different PRBs in the frequency domain.

Preferably, the access unit 41 is further configured to:

Preferably, the channels between different UE groups are non-orthogonal, where the non-orthogonal refers to that if multiple UEs of different UE groups use the same time-frequency resource, the interference value between the UEs is greater than or equal to the set threshold.

Preferably, one UE group includes one UE, or at least two UEs.

Preferably, the obtaining unit 40 is further configured to:

and obtaining the LBT listening time configured by the base station according to the indication of the base station, wherein each UE in one UE group to which the UE belongs is configured with the same LBT listening time.

Preferably, the extra sensing time configured by the base station obtained by the obtaining unit 40 is smaller than the minimum LBT sensing time unit.

Preferably, the obtaining unit 40 is further configured to:

Preferably, the preset calculation rule is obtained by the obtaining unit 40 through a high layer signaling sent by the base station, or is predetermined by the base station side and the terminal side.

Preferably, the calculation rule is:

Preferably, the access unit 41 is further configured to:

when DCI searching is carried out, descrambling is carried out on a searching space based on g-RNTI (radio network temporary identifier) which is notified in advance by a base station through high-level signaling, and when UL DCI is obtained through descrambling, channel access opportunities are competed on time-frequency resources indicated by the UL DCI; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the base station scrambles the UL DCI by adopting g-RNTI.

In summary, in the embodiments of the present invention, a base station divides UEs scheduled to use the same time-frequency resource into a plurality of UE groups, where an interference value between UEs in one UE group using the same time-frequency resource is lower than a set threshold, then additional listening times different from each other are configured for each UE group, after each UE in each UE group performs LBT operation and obtains a channel access opportunity, channel listening continues to be performed within a time duration corresponding to the additional listening time, and when listening ends, channel access is performed if it is still determined that a channel is idle. Therefore, a plurality of UEs can simultaneously compete for channel access opportunities through 1-time scheduling, and because the interference environments of different UEs are different, the situation that all the UEs are blocked by interference is unlikely to occur, so that the UEs with proper conditions can successfully access the channel to perform uplink data transmission, the successful hit rate of UL scheduling is effectively improved, and the successful probability of UL transmission is remarkably improved.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims

1. A resource scheduling method of a Long Term Evolution (LTE) unlicensed frequency band is characterized by comprising the following steps:

the base station divides User Equipment (UE) which is scheduled to use the same time-frequency resource into a plurality of UE groups, wherein the interference value among the UE contained in one UE group when using the same time-frequency resource is lower than a set threshold;

2. The method of claim 1, wherein the scheduling of multiple UEs uses the same time-frequency resource, characterized in that the scheduling of multiple UEs uses the same subframe for transmitting uplink data in time domain, and the scheduling of multiple UEs uses the same or different physical resource blocks PRB in frequency domain.

3. The method of claim 1, wherein the channels are non-orthogonal between different UE groups, and the channel non-orthogonality refers to interference values between each other being greater than or equal to a set threshold if a plurality of UEs of the different UE groups use the same time-frequency resource.

4. The method of claim 1, wherein one UE group comprises one UE or comprises at least two UEs.

5. The method of claim 1, further comprising:

and the base station configures corresponding LBT listening time for each UE group respectively, wherein the UEs belonging to the same UE group have the same LBT listening time.

6. The method of claim 1, further comprising:

7. The method of any one of claims 1-6, further comprising:

the base station loads the extra interception time configuration information of each UE group into uplink scheduling downlink control information (UL DCI) and sends the information to each UE in the corresponding UE group; or,

8. The method as claimed in claim 7, wherein the predetermined calculation rule is previously notified to each UE group by the base station through higher layer signaling, or is previously agreed by the base station side and the terminal side.

9. The method of claim 7, wherein the calculation rule is:

10. The method of claim 7, wherein the calculation rule is:

11. The method of any one of claims 1-6, further comprising:

the base station adopts a piece of UL DCI and schedules a group of same time frequency resources to a plurality of UE simultaneously for use, wherein the base station adopts a preset group modulation scrambling code g-RNTI to scramble the UL DCI, and the g-RNTI is notified to the UE in advance through a high-level signaling, so that the UE descrambles a search space based on the g-RNTI when performing DCI search, and when determining that the UL DCI is obtained by descrambling, the UE contends for a channel access opportunity on the time frequency resources indicated by the UL DCI.

12. The method of any one of claims 1-11, further comprising:

after configuring different extra interception time for each UE group, the base station respectively adopts a modulation scrambling code RNTI pre-distributed for each UE to perform data descrambling at the corresponding scheduled time frequency resource, and determines that the UE corresponding to any RNTI is successfully accessed to a channel after obtaining corresponding uplink data by adopting any RNTI; or,

13. A method for using resources of an LTE (Long term evolution) unlicensed frequency band is characterized by comprising the following steps:

the method comprises the steps that a user terminal UE obtains extra interception time configured by a base station according to base station instructions, wherein the UE is divided into a UE group by the base station, and the interference value between the UE in the UE group is lower than a set threshold when the UE is scheduled to use the same time-frequency resource;

and after the UE executes the listen-before-talk (LBT) operation and obtains the channel access opportunity, continuing to perform channel interception within the corresponding time duration of the corresponding extra interception time, and when the interception is finished, executing the channel access if the channel is still determined to be idle.

14. The method of claim 13, wherein the UEs are scheduled to use the same time-frequency resource, which means that the UEs are scheduled to use the same subframe for transmitting uplink data in time domain and are scheduled to use the same or different physical resource blocks PRB in frequency domain.

15. The method of claim 13, further comprising:

16. The method of claim 13, wherein the channels are non-orthogonal between different UE groups, and the channel non-orthogonality refers to interference values between each other being greater than or equal to a set threshold if a plurality of UEs of the different UE groups use the same time-frequency resource.

17. The method of claim 13, wherein one UE group comprises one UE or comprises at least two UEs.

18. The method of claim 13, further comprising:

19. The method of claim 13, further comprising:

20. The method of any one of claims 13-19, further comprising:

the UE obtains extra interception time configuration information according to uplink scheduling downlink control information (UL DCI) sent by a base station; or,

21. The method as claimed in claim 20, wherein the predetermined calculation rule is obtained by the UE through higher layer signaling sent by the base station, or is pre-agreed by the base station side and the terminal side.

22. The method of claim 20, wherein the calculation rule is:

23. The method of claim 20, wherein the calculation rule is:

24. The method of any one of claims 13-19, further comprising:

when UE searches DCI, descrambling the search space based on a group modulation scrambling code g-RNTI (radio network temporary identifier) pre-notified by a base station through a high-level signaling, and determining that channel access opportunities are contended on time-frequency resources indicated by UL DCI when UL DCI is obtained by descrambling; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the g-RNTI is adopted by the base station to scramble the UL DCI.

25. A resource scheduling device for LTE unlicensed frequency band, comprising:

the system comprises a dividing unit, a scheduling unit and a scheduling unit, wherein the dividing unit is used for dividing User Equipment (UE) which is scheduled to use the same time-frequency resource into a plurality of UE groups, and the interference value among the UEs in one UE group is lower than a set threshold when the UEs use the same time-frequency resource;

26. The apparatus of claim 25, wherein the scheduling unit is further for:

and scheduling a plurality of UEs to use the same time-frequency resource, namely scheduling the plurality of UEs to use the same subframe for transmitting uplink data in a time domain, and scheduling the plurality of UEs to use the same or different physical resource blocks PRB in a frequency domain.

27. The apparatus of claim 25, wherein the different UE groups divided by the dividing unit are non-orthogonal to each other channel, and the non-orthogonal to channel means that if a plurality of UEs of the different UE groups use the same time-frequency resource, an interference value between each other is greater than or equal to a set threshold.

28. The apparatus of claim 27, wherein one UE group divided by the dividing unit comprises one UE or comprises at least two UEs.

29. The apparatus of claim 25, wherein the scheduling unit is further for:

and respectively configuring corresponding LBT listening time for each UE group, wherein the UEs belonging to the same UE group have the same LBT listening time.

30. The apparatus of claim 25, wherein the scheduling unit is further for:

31. The apparatus of any of claims 25-30, wherein the scheduling unit is further to:

the extra interception time configuration information of each UE group is carried in uplink scheduling downlink control information ULDCI and is sent to each UE in the corresponding UE group; or,

32. The apparatus of claim 31, wherein the predetermined calculation rule is notified to each UE group by the scheduling unit through higher layer signaling in advance, or is agreed by the apparatus and a terminal side in advance.

33. The apparatus of claim 31, wherein the calculation rule is:

34. The apparatus of claim 31, wherein the calculation rule is:

35. The apparatus of any of claims 25-30, wherein the scheduling unit is further to:

and a group of same time-frequency resources are simultaneously scheduled to a plurality of UE by adopting a piece of UL DCI, wherein the scheduling unit scrambles the UL DCI by adopting a preset group modulation scrambling code g-RNTI and informs the g-RNTI to the UE in advance through a high-level signaling, so that the UE descrambles a search space based on the g-RNTI when searching the DCI and determines to compete for a channel access opportunity on the time-frequency resources indicated by the UL DCI when descrambling to obtain the UL DCI.

36. The apparatus of any of claims 25-35, wherein the scheduling unit is further to:

37. A device for using resources of an LTE unlicensed frequency band, comprising:

and the access unit is used for continuing to perform channel interception within the corresponding time duration of the corresponding extra interception time after performing listen-before-talk (LBT) operation and acquiring a channel access opportunity, and performing channel access if the channel is still determined to be idle after interception is finished.

38. The apparatus of claim 37, wherein the apparatus is scheduled to use the same time-frequency resources as other UEs, indicating that multiple UEs are scheduled to use the same subframe for transmitting uplink data in time domain and are scheduled to use the same or different physical resource blocks, PRBs, in frequency domain.

39. The apparatus of claim 37, wherein the access unit is further for:

40. The apparatus of claim 37, wherein different UE groups are non-orthogonal in channel, and wherein the non-orthogonal in channel means that if multiple UEs of the different UE groups use the same time-frequency resource, an interference value between each other is greater than or equal to a set threshold.

41. The apparatus of claim 40, wherein one UE group comprises one UE or comprises at least two UEs.

42. The apparatus of claim 37, wherein the obtaining unit is further to:

43. The apparatus of claim 37, wherein the base station configured extra listening time obtained by the obtaining unit is less than a minimum LBT listening time unit.

44. The apparatus of any one of claims 37-43, wherein the obtaining unit is further to:

acquiring extra interception time configuration information according to uplink scheduling downlink control information (UL DCI) sent by a base station; or,

45. The apparatus as claimed in claim 44, wherein the predetermined calculation rule is obtained by the obtaining unit through higher layer signaling sent by the base station, or is pre-agreed by the base station side and the apparatus.

46. The apparatus of claim 44, wherein the calculation rule is:

47. The apparatus of claim 44, wherein the calculation rule is:

48. The apparatus of any one of claims 37-43, wherein the access unit is further to:

when DCI searching is carried out, descrambling is carried out on a searching space based on a group modulation scrambling code g-RNTI which is notified in advance by a high-level signaling by a base station, and when UL DCI is obtained through descrambling, channel access opportunities are contended on time-frequency resources indicated by the UL DCI; the UL DCI is used for simultaneously scheduling a group of same time-frequency resources to a plurality of UE by the base station, and the g-RNTI is adopted by the base station to scramble the UL DCI.