CN110191514B

CN110191514B - Communication method and device of uplink LAA

Info

Publication number: CN110191514B
Application number: CN201910449018.2A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2016-01-08
Filing date: 2016-01-08
Publication date: 2022-09-27
Anticipated expiration: 2036-01-08
Also published as: CN110191514A; CN106961742B; CN106961742A

Abstract

The invention provides a communication method and device of an uplink LAA. The UE first receives a first signal and then performs a CCA check in a first interval on a first carrier. Wherein the first signal explicitly indicates the first time instant. The first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the UE side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the UE side, where K is a positive integer. The time window is a basic unit of time for uplink transmission. The start time of the first interval is a first time. The invention avoids abandoning (Drop) uplink transmission and saves air interface resources.

Description

Communication method and device of uplink LAA

The application is a divisional application of the following original applications:

application date of the original application: 2016 (01 month and 08 days)

- -application number of the original application: 201610011604.5

The invention of the original application is named: uplink LAA communication method and device

Technical Field

The present invention relates to a scheme for communication using an Unlicensed Spectrum in a wireless communication system, and more particularly, to a communication method and apparatus for uplink transmission on an Unlicensed Spectrum (Unlicensed Spectrum).

Background

In a conventional 3GPP (3rd Generation Partner Project) LTE system, data transmission can only occur on a licensed spectrum, however, with a drastic increase in traffic, especially in some urban areas, the licensed spectrum may be difficult to meet the traffic demand. The 62-time congress of the 3GPP RAN discusses a new research topic, namely the research on unlicensed spectrum synthesis (RP-132085), and the main purpose is to research Non-standalone (Non-standalone) deployment using LTE over unlicensed spectrum, where communication over unlicensed spectrum is to be associated with serving cells over licensed spectrum. In RAN #64 congress (seminar), communication over unlicensed spectrum is uniformly named LAA (licensed Assisted Access). LBT (Listen Before Talk) technology is adopted by LAA to avoid multiple transmitters transmitting signals on the same time-frequency resource. Enhanced LAA is formally established over 70 congress of 3GPP RAN, where uplink transmission on LAA carriers is a research focus.

In a conventional cellular network, a base station adjusts uplink Timing of a UE (User Equipment) side through a Timing Advance (Command) Command (Command) to ensure that uplink signals arriving at the base station side are synchronous. For uplink transmission that does not receive a timing advance command, for example, a Physical Random Access Channel (PRACH), the UE generally determines uplink timing according to the received power of a downlink signal, or selects the starting time of an uplink subframe at the UE side as the uplink timing. For LBT-based uplink LAA, in the above several uplink timing methods, the listening UE may listen to the uplink signal sent by the UE in the local cell within the system bandwidth, and then abandon (Drop) uplink transmission.

Disclosure of Invention

The present invention provides a solution to the above problems. It should be noted that, in case of no conflict, the embodiments and features in the embodiments in the UE (User Equipment) of the present application may be applied to the base station, and vice versa. Further, the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

The invention discloses a method for supporting UE (user equipment) communicating on an unlicensed spectrum, which comprises the following steps of A:

-step a. receiving a first signal. The first signal indicating the first time either explicitly or implicitly

-performing a CCA (Clear Channel Assessment) Check (Check) in a first interval on a first carrier.

Wherein the first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the UE side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the UE side, where K is a positive integer. The time window is a basic unit of time for uplink transmission. The start time of the first interval is a first time.

In the above method, the relative relationship between the starting time of the first interval and the ending time of the downlink burst arriving at the UE is fixed, which is not determined by the UE, configured by the base station, or determined according to the starting time of the uplink subframe. The method can ensure that the uplink signal transmitted by the UE does not fall into the time interval of CCA check of other UEs in the same cell, namely, the problem of abandoning uplink transmission mentioned in the background art is avoided.

As an embodiment, the downlink burst is one continuous transmission of the base station, and the base station maintains zero transmission power in a time slot before the downlink burst and a time slot after the downlink burst, and the duration of the time slot is not less than 25 microseconds.

As an embodiment, the time window is one LTE subframe, i.e. 1 ms.

As an embodiment, the time window is one LTE slot, i.e. 0.5 ms.

As an example, the Time window is a short TTI (Transmission Time Interval), and the duration of the Time window is less than 0.5 ms.

As one embodiment, the first signal is transmitted on a first carrier.

As an embodiment, the first signal is physical layer signaling.

As one embodiment, the first signal is cell common physical layer signaling.

As an embodiment, the first signal explicitly indicates the first time, the first signal indicating at least one of:

the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols occupied by the downlink burst in the target subframe is less than the number of OFDM symbols included in one subframe. The target-subframe is a transmission subframe of the first signal or a subframe next to the transmission subframe of the first signal

The transmission sub-frame of the first signal is the last sub-frame of the downlink burst

The next subframe of the transmission subframe of the first signal is the last subframe of the downlink burst.

As an embodiment, the first signal implicitly indicates a first time, where the first time is a termination time of the first signal received by the UE, that is, the first signal is located at the end of the downlink burst. As a sub-embodiment, the first signal includes at least one of a { Zadoff-Chu sequence, a pseudo-random sequence }.

As one embodiment, the second signal is a Random Access Preamble.

As an embodiment, the second signal is transmitted on a PUCCH (Physical Uplink Control Channel).

As an embodiment, the second signal is transmitted on a PUSCH (Physical Uplink Shared Channel).

As an example, the duration of the first interval does not exceed 60 microseconds.

As an example, the duration of the first interval is not less than 25 microseconds.

As an embodiment, a listening (sensing) duration of the UE in the first time interval is less than a duration of the first interval.

As an embodiment, the CCA check refers to: determining that a wireless signal can currently be transmitted on the first carrier if the received power is below a certain threshold, otherwise determining that a wireless signal cannot currently be transmitted on the first carrier. The particular threshold is fixed or configurable.

Specifically, according to one aspect of the present invention, the method further comprises the following steps:

-step c. transmitting the second signal on the first carrier.

Wherein the UE determines to transmit a second signal according to the CCA check in the step B, and a second time is a termination time of the first interval. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As an embodiment, the starting transmission moment of the second signal is the second moment, and the duration of the first interval is equal to the sum of the CCA check time plus the receive/transmit switching time. As a sub-embodiment of the above embodiment, the CCA check time is not less than 25 microseconds. As a sub-embodiment of the above embodiment, the CCA check time is 25 microseconds. As a sub-embodiment of the above embodiment, the receive/transmit switching time is 624Ts, which is 1/30720 ms.

As an embodiment, the starting transmission time of the second signal is a third time, the duration of the first interval is equal to the CCA check time, and the interval between the third time and the second time is a reception/transmission switching time.

Specifically, according to an aspect of the present invention, the step C further includes at least a step C1 of the following steps:

-step c1. receiving first signalling, the first signalling indicating a second interval.

Step C2. transmits a third signal on the first carrier, the starting transmission instant of the third signal being the instant delayed by K1 time windows after the starting transmission instant of the second signal, said K1 being a positive integer.

Wherein the duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

As an example, the duration of the one wideband symbol is 2208Ts, which is 1/30720 milliseconds.

As one embodiment, the wideband symbol is an OFDM symbol including CP (Cyclic Shift).

As one embodiment, the wideband symbols are SC-FDMA symbols including a CP.

As an embodiment, the second interval is indicated by K2 bits, said K2 being a positive integer no greater than 8, the duration of the second interval is Ta x 16Ts, Ta is indicated by said K2 bits, Ta is a non-negative integer no greater than 256, said Ts is 1/30720 milliseconds.

As an embodiment, the third signal includes a first part and a second part, wherein the first part is transmitted in the second interval, the second part is transmitted outside the second interval, and the second part includes at least one of { UCI (Uplink Control Information), Uplink data }. As a sub-embodiment, the transmission Channel corresponding to the Uplink data is an UL-SCH (Uplink Shared Channel). As a sub-embodiment, the UCI includes at least one of { HARQ-ACK, CSI (Channel Status Information) }. As a sub-embodiment, the first part is a meaningless signal, used to reserve the channel. As a sub-embodiment, the first part indicates an identity of the UE.

The essence of the above embodiment is: the base station does not adjust the uplink timing of the UE according to the received second signal as in the conventional scheme, but adjusts the transmission timing of the uplink useful signal (i.e., the second part) of the UE according to the received second signal.

As an embodiment, the first signaling is MAC (Medium Access Control) layer signaling.

As an embodiment, the first signaling is RAR (Random Access Response).

In the above embodiment, the first signaling does not Change the uplink Timing of the UE, but indicates the transmission Timing of the useful signal (i.e. the second part), compared to the uplink Timing adjustment (Change) indicated by the Timing Advance (Command) Command in the conventional RAR.

Specifically, according to an aspect of the present invention, the step B further includes the steps of:

-step b1. receiving a second signaling, the second signaling scheduling a second signal.

Wherein the second signaling is physical layer signaling.

As one embodiment, the second signal is transmitted on the PUSCH.

The invention discloses a method for supporting a base station communicating on an unauthorized frequency spectrum, which comprises the following steps A:

-step a. transmitting a first signal. The first signal indicating the first time explicitly or the first signal indicating the first time implicitly

-step b. maintaining zero transmit power in a first interval on a first carrier

-step c. monitoring the second signal on the first carrier.

Wherein the first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the given UE side, or the first time is the time delayed by K time windows after the termination time of the downlink burst at the given UE side, where K is a positive integer. The given UE is a sender of the second signal. The time window is a basic unit of time for uplink transmission. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The second time is the termination time of the first interval. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

For one embodiment, the second signal includes CRC (Cyclic Redundancy Check) bits, and the monitoring includes determining whether the second signal is detected based on the CRC.

As an embodiment, the second signal comprises a signature sequence, and the monitoring comprises at least one of { coherent detection of the signature sequence, non-coherent detection of the signature sequence }.

-step c1. sending a first signaling, the first signaling indicating a second interval.

-step C2. receiving a third signal on the first carrier, the starting transmission instant of the third signal being the instant delayed by K1 time windows after the starting transmission instant of the second signal, said K1 being a positive integer.

-step b1. transmitting a second signaling, the second signaling scheduling a second signal.

Wherein the second signaling is physical layer signaling.

The invention discloses a user equipment supporting communication on an unlicensed spectrum, which is characterized by comprising:

a first module: for receiving a first signal. The first signal indicating the first time either explicitly or implicitly

A second module: for a CCA check in a first interval on a first carrier.

Wherein the first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the user equipment side, or the first time is the time delayed by K time windows after the termination time of the downlink burst at the user equipment side, where K is a positive integer. The time window is a basic unit of time for uplink transmission. The start time of the first interval is a first time.

As an embodiment, the above user equipment is characterized in that the equipment further comprises:

a third module: and means for transmitting a second signal on the first carrier when the second means determines to transmit the second signal based on the CCA check.

Wherein the second time is the end time of the first interval. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As an embodiment, the third module is further configured to receive first signaling, where the first signaling indicates the second interval. Wherein the duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

As an embodiment, the third module is further configured to transmit a third signal on the first carrier, where a starting transmission time of the third signal is a time delayed by K1 time windows after a starting transmission time of the second signal, and K1 is a positive integer.

For an embodiment, the second module is further configured to receive a second signaling, and the second signaling schedules the second signal. Wherein the second signaling is physical layer signaling.

The invention discloses a base station device supporting communication on an unlicensed spectrum, which is characterized by comprising:

a first module: for transmitting a first signal. The first signal indicating the first time explicitly or the first signal indicating the first time implicitly

A second module: for maintaining zero transmission power in a first interval on a first carrier

A third module: for monitoring the second signal on the first carrier.

Wherein the first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the given UE side, or the first time is the time delayed by K time windows after the termination time of the downlink burst at the given UE side, where K is a positive integer. The given UE is a sender of the second signal. The time window is a basic unit of time for uplink transmission. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The second time instant is the end time instant of the first interval. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As an embodiment, the second module in the base station device is further configured to send a second signaling, where the second signaling schedules the second signal. Wherein the second signaling is physical layer signaling.

As an embodiment, the third module in the base station device is further configured to send a first signaling, where the first signaling indicates the second interval. Wherein the duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

As an embodiment, the third module in the base station device is further configured to receive a third signal on the first carrier, where a starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, and K1 is a positive integer.

Compared with the traditional method, the method has the following technical advantages:

the interception UE does not monitor uplink signals sent by other UEs in the cell during the CCA check interval in the system bandwidth, thereby avoiding abandoning (Drop) uplink transmission

In the conventional LTE, the UE determines the uplink transmission timing according to the uplink subframe on the UE side, and cannot transmit an uplink signal in GP (Guard Period), which wastes resources. In the invention, the UE determines the uplink sending timing according to the termination time of the downlink subframe at the UE side, and sends the uplink signal as early as possible, thereby saving air interface resources.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments thereof, made with reference to the following drawings:

fig. 1 shows a flow diagram of uplink transmission on an LAA carrier according to one embodiment of the invention;

fig. 2 illustrates a diagram of multiple UEs not interfering with each other according to an embodiment of the invention;

FIG. 3 shows a schematic diagram of base station side timing and UE side timing according to one embodiment of the invention;

FIG. 4 shows a schematic diagram of a third signal including a first portion and a second portion according to one embodiment of the invention;

FIG. 5 illustrates a schematic diagram of candidate locations at a first time in accordance with an embodiment of the invention;

FIG. 6 illustrates a schematic diagram of a first time, a second time, and a third time according to one embodiment of the invention;

fig. 7 shows a block diagram of a processing means in a UE according to an embodiment of the invention;

fig. 8 shows a block diagram of a processing means in a base station according to an embodiment of the invention;

Detailed Description

The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

Example 1

Embodiment 1 illustrates a flow chart of uplink transmission on an LAA carrier, as shown in fig. 1. In fig. 1, the serving cell for UE U2 is maintained by base station N1, and the steps identified in block F1 and the steps identified in block F2 are optional, respectively.

For base station N1, a first signal is transmitted in step S11; maintaining zero transmit power in a first interval on a first carrier in step S12; a second signal is monitored on the first carrier in step S13.

For the UE U2, receiving a first signal in step S21; a CCA check is performed in a first interval on the first carrier in step S22.

In embodiment 1, the first carrier is deployed in the unlicensed spectrum. The first time is a termination time of the downlink burst on the side of the UE U2, or the first time is a time delayed by K time windows after the termination time of the downlink burst on the side of the UE U2, where K is a positive integer. The time window is a basic unit of time for uplink transmission. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The second time is the termination time of the first interval. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As sub embodiment 1 of embodiment 1, the UE U2 transmits a second signal on a first carrier in step S23. Wherein the UE U2 determines from the CCA check that a second signal can currently be transmitted on the first carrier in step S22, the second time being a termination time of the first interval.

As sub-embodiment 2 of embodiment 1, the base station N1 transmits the first signaling in step S14 and receives the third signal on the first carrier in step S15. The UE U2 receives the first signaling in step S24, and transmits the third signal on the first carrier in step S25. Wherein the first signaling indicates the second interval, the starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, and K1 is a positive integer. The duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

As sub-embodiment 3 of embodiment 1, the first signal is physical layer signaling sent on a licensed spectrum, the first signal explicitly indicating the first time instant.

As sub-embodiment 4 of embodiment 1, a first signal is transmitted on a first carrier, a termination time of the first signal on the UE U2 side is a first time, and the first signal includes at least one of { Zadoff-Chu sequence, pseudo-random sequence }.

As a sub-embodiment 5 of embodiment 1, the start transmission timing of the second signal is the second timing, and the duration of the first interval is not less than 55.3 microseconds.

As a sub-embodiment 6 of embodiment 1, the start transmission timing of the second signal is the third timing, and the duration of the first interval is not less than 25 microseconds. Third time instant after the second time instant, the interval between the third time instant and the second time instant is 624Ts, which is 1/30720 milliseconds.

As sub-embodiment 8 of embodiment 1, the second signal is transmitted on PUSCH.

As sub-embodiment 9 of embodiment 1, the second signal is transmitted on the PUCCH.

Example 2

Embodiment 2 illustrates a schematic diagram of multiple UEs not interfering with each other, as shown in fig. 2. In fig. 2, the cells maintained by base station N2 on the first carrier are the serving cells for UE U3 and UE U4.

On the first carrier, the propagation delay from base station N2 to UE U3 is T1-as shown by arrow R1, the propagation delay from base station N2 to UE U4 is T3-as shown by arrow R3, and the propagation delay from UE U3 to UE U4 is T2-as shown by arrow R2.

The reference time of the base station side is T, the starting time when the UE U3 starts to perform CCA check is T + T1, the time required for the UE U3 to perform CCA check and receive/transmit switching is T4 — that is, the time when the UE U3 transmits an uplink signal at T + T1+ T4, and the time when the uplink signal reaches the UE U4 is T + T1+ T4+ T2. The starting time for the UE U4 to start performing the CCA check is T + T3, and the time required for the UE U4 to perform the CCA check and the receive/transmit switch is T4 — i.e., the UE U4 has completed the CCA check at T + T3+ T4. Since T1+ T2 is not less than T3, when the uplink signal arrives at UE U4, UE U4 has completed the CCA check. Therefore, the uplink signal transmitted by UE U3 does not affect the CCA check of UE U4, and thus does not cause UE U4 to abandon the uplink transmission.

As sub-embodiment 1 of embodiment 2, T is the termination time of the downlink burst on the base station side.

As a sub-embodiment 2 of embodiment 2, T is a time at which a downlink burst is delayed by K time windows after the termination time of the base station side, where K is a positive integer, and the time windows are basic time units of uplink scheduling. As an embodiment, the time window is an LTE subframe.

Example 3

Embodiment 3 illustrates a schematic diagram of base station side timing and UE side timing, as shown in fig. 3. In fig. 3, the cells maintained by base station N2 on the first carrier are the serving cells for UE U3 and UE U4.

On the first carrier, the propagation delay from base station N2 to UE U3 is T1 and the propagation delay from base station N2 to UE U4 is T3. Base station N2 maintains zero transmit power for special interval P, and base station N2 receives an uplink burst after special interval P. The UE U3 performs CCA check in the special interval P1, and transmits an uplink burst after the special interval P1 if it is confirmed that an uplink signal can be transmitted. The UE U3 performs a CCA check in the special interval P2, and transmits an uplink burst after the special interval P2 if it is confirmed that an uplink signal can be transmitted.

The duration of the special interval P1 is equal to the duration of the special interval P2.

Unlike a conventional cellular network, in embodiment 3, the duration of the special interval P of the base station N2 is not fixed, depending on the propagation delay from the target UE, which is the one with the smallest propagation delay to the base station N2 among the UEs scheduled by the base station N2 in the uplink burst, to the base station N2.

As sub-embodiment 1 of embodiment 3, for UE U3, the special interval P1 is the first interval in the present invention. For UE U4, special interval P2 is the first interval in the present invention.

Example 4

Embodiment 4 illustrates a schematic diagram of a third signal comprising a first part and a second part, as shown in fig. 4. In fig. 4, the blank boxes indicate special intervals, the third signal is indicated by the slash, the second part of the third signal is indicated by the slash, and the first part of the third signal is indicated by the slash.

In embodiment 4, for a UE, first receiving a first signaling, where the first signaling indicates a second interval; then performing a CCA check in a special interval, the CCA check indicating that the first carrier is currently unoccupied; then, a third signal is transmitted on the first carrier, the starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, and K1 is a positive integer. For the base station, first signaling is sent, and then a third signal is received on the first carrier.

In embodiment 4, the duration of the second interval does not exceed the duration of one wideband symbol, and the second signal is a random access preamble. The portion of the third signal in the second interval is the first portion and the portion after the second interval is the second portion.

As sub-embodiment 1 of embodiment 4, the first signaling is RAR.

As sub-embodiment 2 of embodiment 4, the second part of the third signal includes at least one of { physical layer data, UCI (Uplink Control Information) }, the UCI includes at least one of { HARQ-ACK, CSI (Channel Status Information) }, and the CSI includes at least one of { RI (Rank Indicator), PTI (Precoding Type Indicator), PMI (Precoding Matrix Indicator ), CQI (Channel Quality Indicator, Channel Quality Indicator), and CRI (CSI-RS resource Indicator) }.

As a sub-embodiment 3 of embodiment 4, the first part of the third signal is a meaningless signal, used by the UE for a reserved (Reserve) channel.

As a sub-embodiment 4 of embodiment 4, the first part of the third signal indicates an identity of a sender of the third signal, while being used by the sender of the third signal for reserving (Reserve) channels, the identity being an integer.

In embodiment 4, the useful signals (i.e., the second part) transmitted by the UEs maintain synchronization at the wideband symbol level, but not necessarily at the subframe level, at the base station side. On one hand, the receiving performance of the base station side is ensured, and meanwhile, the air interface resources are fully utilized, and the transmission efficiency is improved.

Example 5

Embodiment 5 illustrates a schematic diagram of candidate positions at a first time, as shown in fig. 5. In fig. 5, the blank boxes identify special intervals, the slashes identify downlink bursts, and the slashes identify uplink bursts.

In embodiment 5, on the first carrier, the base station maintains zero transmission power in both the special interval P5 and the special interval P6, and the base station cannot receive an uplink burst in the special interval P5 and the special interval P6.

As sub-embodiment 1 of embodiment 5, for a UE, time #1 is a first time in the present invention, that is, the first time is a termination time of a downlink burst on the UE side.

As sub-embodiment 1 of embodiment 5, for the UE, the time #2 is the first time in the present invention, that is, the first time is a time delayed by 1 time window after the termination time of the downlink burst on the UE side.

In embodiment 5, the durations of the special interval P5 and the special interval P6 are different.

Example 6

Embodiment 6 illustrates a schematic diagram of the first time, the second time and the third time, as shown in fig. 6.

In embodiment 6, the special interval in the present invention includes two parts of the first interval and the reception/transmission switching time in the present invention.

The first time is a start time of the first interval, the second time is an end time of the first interval, and the third time is an end time of the reception/transmission switching time.

As sub-embodiment 1 of embodiment 6, the duration of the first interval is not less than 25 microseconds.

As a sub-embodiment 2 of embodiment 6, the duration of the first interval is 16 microseconds.

As a sub-embodiment 3 of embodiment 6, the duration of the receive/transmit switching time is 624Ts, which is 1/30720 milliseconds.

As sub-embodiment 4 of embodiment 6, the UE performs a sensing operation of CCA check for a partial duration of the first interval.

Example 7

Embodiment 7 illustrates a block diagram of a processing device in a UE, as shown in fig. 7. In fig. 7, the UE processing apparatus 200 is composed of a first module 201, a second module 202 and a third module 203.

The first module 201 is configured to receive a first signal. The first signal indicates the first time instant explicitly or the first signal indicates the first time instant implicitly. The second module 202 is configured to perform a CCA check in a first interval on a first carrier. The third module 203 is configured to transmit the second signal on the first carrier when the second module 202 determines to transmit the second signal according to the CCA check.

In embodiment 7, the first carrier is deployed in the unlicensed spectrum. The first time is the termination time of the downlink burst at the UE side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the UE side, where K is a positive integer. The time window is a basic unit of time for uplink transmission. The start time of the first interval is a first time. The second time is the termination time of the first interval. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As sub-embodiment 1 of embodiment 7, the first signal explicitly indicates a first time, the first signal is a cell common DCI, the first signal indicates the number of wideband symbols occupied by the downlink burst in the last subframe, and the first time is a transmission termination time of the last wideband symbol occupied by the downlink burst.

As sub-embodiment 2 of embodiment 7, the first signal implicitly indicates the first time, the first signal is a signature sequence, and the transmission termination time of the first signal is the first time.

Example 8

Embodiment 8 is a block diagram illustrating a processing apparatus in a base station, as shown in fig. 8. In fig. 8, the base station processing apparatus 300 is composed of a first module 301, a second module 302 and a third module 303.

The first module 301 is configured to transmit a first signal. The first signal indicates the first time instant explicitly or the first signal indicates the first time instant implicitly. The second module 302 is configured to maintain zero transmit power in a first interval on a first carrier. The third module 303 is configured to monitor the second signal on the first carrier.

In embodiment 8, a first carrier is deployed in an unlicensed spectrum. The first time is the termination time of the downlink burst at the given UE side, or the first time is the time delayed by K time windows after the termination time of the downlink burst at the given UE side, where K is a positive integer. The given UE is a sender of a second signal. The time window is a basic unit of time for uplink transmission. The initial transmission time of the second signal is the second time, or the initial transmission time of the second signal is the third time. The second time is the termination time of the first interval. The third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

As sub-embodiment 1 of embodiment 8, the second module 302 is further configured to send a second signaling, and the second signaling schedules the second signal. Wherein, the second signaling is DCI for scheduling uplink transmission.

As sub-embodiment 2 of embodiment 8, the third module 303 is further configured to send the first signaling and receive a third signal on the first carrier. Wherein the first signaling indicates the second interval, the starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, and K1 is a positive integer. The duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, such as a read-only memory, a hard disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The UE in the present invention includes but is not limited to a mobile phone, a tablet computer, a notebook, a network card, and other wireless communication devices. The base station or system device in the present invention includes but is not limited to a macro cell base station, a micro cell base station, a home base station, a relay base station, and other wireless communication devices.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method in a UE supporting communication over an unlicensed spectrum, comprising the steps of:

-step a. receiving a first signal; the first signal indicates the first time explicitly or the first signal indicates the first time implicitly;

-step b. performing a CCA check in a first interval on a first carrier;

wherein the first carrier is deployed in an unlicensed spectrum; the first time is the termination time of the downlink burst at the UE side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the UE side, where K is a positive integer; the time window is a basic time unit of uplink transmission; the starting time of the first interval is a first time; the first signal is physical layer signaling.

2. The method of claim 1, further comprising the steps of:

-step c. transmitting a second signal on a first carrier;

wherein the UE determines to transmit a second signal according to the CCA check in the step B, and a second time is a termination time of a first interval; the initial sending time of the second signal is the second time, or the initial sending time of the second signal is the third time; the third time is subsequent to the second time, and the interval between the third time and the second time is fixed.

3. The method according to claim 2, wherein said step C further comprises at least step C1 of the following steps:

-a step c1. receiving a first signaling;

step C2. transmitting a third signal on the first carrier,

wherein the first signaling indicates a second interval, the starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, and K1 is a positive integer; the duration of the second interval does not exceed the duration of one wideband symbol, and the second signal is a random access preamble.

4. The method according to claim 2 or 3, wherein said step B further comprises the steps of:

-step b1. receiving a second signaling, the second signaling scheduling a second signal;

wherein the second signaling is physical layer signaling.

5. A method in a base station supporting communication over an unlicensed spectrum, comprising the steps of:

-step a. transmitting a first signal; the first signal indicates the first time explicitly or the first signal indicates the first time implicitly;

-step b. maintaining zero transmit power in a first interval on a first carrier;

-step c. monitoring a second signal on a first carrier;

wherein the first carrier is deployed in an unlicensed spectrum; the first time is the termination time of the downlink burst at the given UE side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the given UE side, wherein K is a positive integer; the given UE is a sender of a second signal; the time window is a basic time unit of uplink transmission; the initial sending time of the second signal is the second time, or the initial sending time of the second signal is the third time; the second time is the end time of the first interval; the third time is after the second time, and the interval between the third time and the second time is fixed; the first signal is physical layer signaling.

6. The method according to claim 5, wherein said step C further comprises at least step C1 of the following steps:

-a step c1. sending a first signaling;

-step C2. receiving a third signal on a first carrier;

7. The method according to claim 5 or 6, wherein said step B further comprises the steps of:

-step b1. transmitting a second signaling, the second signaling scheduling a second signal;

wherein the second signaling is physical layer signaling.

8. A user device that supports communication over an unlicensed spectrum, the device comprising:

a first module: for receiving a first signal; the first signal indicates the first time explicitly or the first signal indicates the first time implicitly;

a second module: for performing a CCA check in a first interval on a first carrier;

wherein the first carrier is deployed in an unlicensed spectrum; the first time is the termination time of the downlink burst at the user equipment side, or the first time is the time of delaying K time windows after the termination time of the downlink burst at the user equipment side, wherein K is a positive integer; the time window is a basic time unit of uplink transmission; the starting time of the first interval is a first time; the first signal is physical layer signaling.

9. The UE of claim 8, comprising a third module configured to transmit a second signal on the first carrier when the second module determines to transmit the second signal based on the CCA check;

wherein the second time is the end time of the first interval; the initial sending time of the second signal is the second time, or the initial sending time of the second signal is the third time; the third time is after the second time, and the interval between the third time and the second time is fixed; the first signal is physical layer signaling.

10. The UE of claim 9, wherein the third module is further configured to receive the first signaling, or wherein the third module is further configured to receive the first signaling and transmit a third signal on the first carrier;

wherein the first signaling indicates a second interval; the initial transmission time of the third signal is delayed by K1 time windows after the initial transmission time of the second signal, wherein K1 is a positive integer; the duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

11. The UE of claim 9 or 10, wherein the second module is configured to receive a second signaling, and the second signaling schedules the second signal;

wherein the second signaling is physical layer signaling.

12. A base station device that supports communication over unlicensed spectrum, the device comprising:

a first module: for transmitting a first signal; the first signal indicates the first time explicitly or the first signal indicates the first time implicitly;

a second module: for maintaining zero transmit power in a first interval on a first carrier;

a third module: for monitoring a second signal on a first carrier;

13. The base station device of claim 12, wherein the third module sends the first signaling, or the third module sends the first signaling and receives a third signal on a first carrier; wherein the first signaling indicates a second interval; the starting transmission time of the third signal is a time delayed by K1 time windows after the starting transmission time of the second signal, wherein K1 is a positive integer; the duration of the second interval does not exceed the duration of one wideband symbol and the second signal is a random access preamble.

14. The base station device of claim 12 or 13, wherein the third module transmits a second signaling, and the second signaling schedules the second signal; wherein the second signaling is physical layer signaling.