CN102231643B

CN102231643B - Data transmission method and equipment for carrier aggregation system

Info

Publication number: CN102231643B
Application number: CN201110185250.3A
Authority: CN
Inventors: 林亚男; 潘学明; 沈祖康; 丁昱
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2011-07-01
Filing date: 2011-07-01
Publication date: 2014-03-12
Anticipated expiration: 2031-07-01
Also published as: CN102231643A; WO2013004127A1

Abstract

The embodiment of the invention discloses a data transmission method and data transmission equipment for a carrier aggregation system, and relates to the technical field of wireless communication. The method and the equipment are used for solving the problem of how to transmit data in a sub-frame with an uncertain uplink/downlink transmission direction by user equipment (UE). The method comprises that: a terminal determines whether uplink scheduling signaling for the sub-frame with the uncertain uplink/downlink transmission direction is received from a base station or not; and the terminal transmits uplink data or receives downlink data by using the sub-frame with the uncertain uplink/downlink transmission direction according to a determination result. The terminal in the scheme can determine how to transmit the data in the sub-frame with the uncertain uplink/downlink transmission direction according to whether the uplink scheduling signaling is received or not, thereby solving the problem of how to transmit the data in the sub-frame with the uncertain uplink/downlink transmission direction by the UE not supporting synchronous uplink and downlink transmission.

Description

Data transmission method and equipment in carrier aggregation system

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a data transmission method and device in a carrier aggregation system.

Background

In Long Term Evolution (LTE) systems and previous wireless communication systems, there is only one carrier in a cell, and the maximum bandwidth is 20MHz in LTE systems, as shown in fig. 1.

In an LTE-a (LTE Advanced) system, the peak rate of the system is greatly improved compared to the LTE system, and it is required to achieve 1Gbps downlink and 500Mbps uplink. The peak rate requirement cannot be achieved if only one carrier with a maximum bandwidth of 20MHz is used. Therefore, the LTE-a system needs to extend a bandwidth that can be used by a terminal, thereby introducing a Carrier Aggregation (CA) technique that aggregates a plurality of continuous or discontinuous carriers under the same base station (eNB) while serving the terminal (UE) to provide a required rate. These aggregated carriers are also called Component Carriers (CCs). Each cell may be a component carrier, and cells (component carriers) under different enbs cannot be aggregated. In order to ensure that the UE of LTE can operate under each aggregated carrier, each carrier does not exceed 20MHz at maximum. The CA technology for LTE-A is shown in FIG. 2.

There are 4 carriers that can be aggregated under the base station of LTE-a shown in fig. 2, and the base station can perform data transmission with the UE on the 4 carriers simultaneously, so as to improve the system throughput.

In LTE systems, Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes are both one radio frame 10ms and one subframe 1 ms. For each radio frame of TDD, seven TDD uplink/downlink subframe configurations are defined, as shown in table 1 below, where D represents a Downlink (DL) subframe, U represents an Uplink (UL) subframe, and S represents a special subframe of the TDD system, for example, configuration 1 is DSUUDDSUUD.

TABLE 1TDD UL/DL subframe configuration

In LTE release 11(Rel-11) or later systems, LTE cells located in different frequency bands (bands) may use different TDD uplink/downlink subframe configurations in order to avoid interference to other TDD systems, as shown in fig. 3.

Where carrier 1 and carrier 2 are located in Band a, carrier 3 is located in Band B, and cell 1, cell 2, and cell 3 are cells on carrier 1, carrier 2, and carrier 3, respectively. The TDD uplink and downlink configurations of the cell 1 and the cell 2 are the same, and are both configuration 1, and the TDD uplink/downlink subframe configuration of the cell 3 is different from that of the cell 1 and the cell 2, and is configuration 2. If the terminal wishes to perform carrier aggregation by using the three cells, the TDD uplink and downlink configurations of all aggregated cells of the terminal are different.

It should be noted that if one terminal can aggregate multiple bands and different bands can support different TDD uplink/downlink subframe configurations, in general, the terminal uses different transceivers for different bands.

In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:

at present, there is no clear scheme for how a UE which cannot support uplink and downlink simultaneous transmission works in uplink and downlink overlapping subframes after aggregation is performed by using carriers configured in different TDD uplink and downlink.

Disclosure of Invention

The embodiment of the invention provides a data transmission method and equipment in a carrier aggregation system, which are used for solving the problem of how to transmit data in a subframe with uncertain uplink and downlink transmission directions by UE.

A method of data transmission in a carrier aggregation system, the method comprising:

the terminal determines whether an uplink scheduling signaling which is sent by a base station and aims at a subframe with uncertain uplink and downlink transmission directions is received;

and the terminal transmits uplink data or receives downlink data by using the subframe with uncertain uplink and downlink transmission directions according to the determined result.

A method of data transmission scheduling in a carrier aggregation system, the method comprising:

before sending a downlink scheduling signaling of a subframe with uncertain uplink and downlink transmission directions to a terminal, a base station determines whether an uplink scheduling signaling of the subframe with uncertain uplink and downlink transmission directions is sent;

and when the uplink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction is determined to be sent, prohibiting sending the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction in the subframe with the uncertain uplink and downlink transmission direction.

A terminal, the terminal comprising:

a scheduling signaling determining unit, configured to determine whether an uplink scheduling signaling sent by a base station and addressed to a subframe with an uncertain uplink and downlink transmission direction is received;

and the signal transmission unit is used for transmitting the uplink data or receiving the downlink data by using the subframe with uncertain uplink and downlink transmission directions according to the determination result.

A base station, the base station comprising:

a determining unit, configured to determine whether an uplink scheduling signaling of a subframe with an uncertain uplink and downlink transmission direction has been sent before sending the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction to a terminal;

and the processing unit is used for prohibiting sending the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction in the subframe with the uncertain uplink and downlink transmission direction when the uplink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction is determined to be sent.

In the scheme provided by the embodiment of the invention, the terminal determines whether an uplink scheduling signaling which is sent by the base station and aims at the subframe with uncertain uplink and downlink transmission directions is received, and uses the subframe with uncertain uplink and downlink transmission directions to send uplink data or receive downlink data according to the determination result. Therefore, in the scheme, the terminal can determine how to transmit data in the subframe with uncertain uplink and downlink transmission directions according to whether the uplink scheduling signaling is received, so that the problem of how to transmit data in the subframe with uncertain uplink and downlink transmission directions by the UE which cannot support uplink and downlink simultaneous transmission is solved.

Drawings

Fig. 1 is a schematic view of carrier distribution of an LTE cell in the prior art;

FIG. 2 is a schematic diagram of CA in an LTE-A system in the prior art;

fig. 3 is a schematic diagram illustrating different TDD uplink/downlink subframe configurations used by different bands aggregated by an LTE-ACA terminal in the prior art;

FIG. 4 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 5 is a schematic flow chart of another method provided by the embodiments of the present invention;

fig. 6 is a schematic diagram of uplink scheduling of a subframe with an uncertain uplink and downlink transmission direction in the embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.

Detailed Description

In order to solve the problem of how to perform data transmission in a subframe with an uncertain uplink and downlink transmission direction by a UE, an embodiment of the present invention provides a method for data transmission in a carrier aggregation system. Since the UL grant is always sent in advance, for example, the UL grant in the LTE system needs to be sent at least 4ms in advance, the UE can dynamically determine the transmission direction of the subframe with uncertain uplink and downlink transmission directions before the subframe with uncertain uplink and downlink transmission directions arrives.

The subframe with uncertain uplink and downlink transmission directions refers to a subframe without preset configuration or appointed transmission directions in uplink and downlink overlapped subframes.

The uplink and downlink overlapped subframes refer to that when a terminal aggregates a plurality of frequency bands and different frequency bands support different TDD uplink/downlink subframe configurations, if transmission directions on different carriers in a certain subframe are not consistent, the subframe is an uplink and downlink overlapped subframe. The uplink and downlink overlapped subframes which may occur in the LTE-a system include subframe 3, subframe 4, subframe 6, subframe 7, subframe 8 and subframe 9.

Referring to fig. 4, a method for data transmission in a carrier aggregation system according to an embodiment of the present invention includes the following steps:

step 40: the terminal determines whether an uplink scheduling signaling (UL grant) sent by a base station and aiming at a subframe with uncertain uplink and downlink transmission directions is received;

step 41: and the terminal transmits uplink data or receives downlink data by using the subframe with uncertain uplink and downlink transmission directions according to the determined result.

As an implementation manner, if the terminal receives an uplink scheduling signaling sent by the base station for a subframe with an uncertain uplink and downlink transmission direction, the terminal sends a PUSCH on a carrier corresponding to uplink transmission in the subframe with the uncertain uplink and downlink transmission direction, otherwise, the terminal detects a PDCCH and/or receives a PDSCH on a carrier corresponding to downlink transmission in an overlapped subframe with uplink and downlink.

As another embodiment, if the terminal does not receive the uplink scheduling signaling issued by the base station for the subframes with uncertain uplink and downlink transmission directions for each subframe of the consecutive N subframes with uncertain uplink and downlink transmission directions, the terminal detects the PDCCH and/or receives the PDSCH on the carrier corresponding to the downlink transmission in each subframe with uncertain uplink and downlink transmission directions;

if the terminal receives an uplink scheduling signaling issued by the base station for the subframe with uncertain uplink and downlink transmission directions for at least one subframe of the continuous N subframes with uncertain uplink and downlink transmission directions, the terminal does not detect a PDCCH and/or receive a PDSCH in a critical subframe of the subframes with uncertain uplink and downlink transmission directions and a subframe before the critical subframe, and detects the PDCCH and/or receive the PDSCH on a carrier corresponding to downlink transmission in a subframe after the critical subframe; sending PUSCH on a carrier wave corresponding to uplink transmission in a subframe which receives corresponding uplink scheduling signaling in N subframes with uncertain uplink and downlink transmission directions; the critical subframe is a subframe which is uncertain in uplink and downlink transmission directions and corresponds to the latest received uplink scheduling signaling; and N is a positive integer.

As another embodiment, if the terminal receives an uplink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, and does not receive a downlink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction, the terminal sends the PUSCH on the carrier corresponding to the uplink transmission in the subframe with the uncertain uplink and downlink transmission direction;

if the terminal receives a downlink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction and does not receive an uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the terminal detects a PDCCH and/or receives a PDSCH on a carrier wave which is corresponding to downlink transmission in the subframe with the uncertain uplink and downlink transmission direction;

if the terminal does not receive the downlink scheduling signaling and the uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the subframe is a blank subframe, and the terminal does not detect a PDCCH and/or receive a PDSCH in the subframe with the uncertain uplink and downlink transmission direction and does not send a PUSCH in the subframe with the uncertain uplink and downlink transmission direction;

if the terminal receives a downlink scheduling signaling and an uplink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the terminal determines the transmission direction of the subframe with the uncertain uplink and downlink transmission direction according to a preset subframe transmission direction determining method, if the transmission direction is uplink, the terminal sends a Physical Uplink Shared Channel (PUSCH) on a carrier corresponding to uplink transmission in the subframe with the uncertain uplink and downlink transmission direction, and if the transmission direction is downlink, the terminal detects a Physical Downlink Control Channel (PDCCH) and/or receives a Physical Downlink Shared Channel (PDSCH) on the carrier corresponding to downlink transmission in the subframe with the uncertain uplink and downlink transmission direction.

The embodiment can be applied to a multi-subframe scheduling or cross-subframe scheduling mode, because in this mode, the UE can know all scheduling information (including DL grant and UL grant) of subframes with uncertain uplink and downlink transmission directions before the arrival of the subframes with uncertain uplink and downlink transmission directions.

Specifically, the terminal determines the transmission direction of the subframe in which the uplink and downlink transmission directions are uncertain according to a preset subframe transmission direction determination method, and the specific implementation may adopt the following two modes:

firstly, a terminal determines the transmission direction of a subframe with uncertain uplink and downlink transmission directions according to the preset transmission direction priority;

for example, the terminal determines the transmission direction with the highest priority according to the preset transmission direction priority, determines the transmission direction of the subframe with uncertain uplink and downlink transmission directions as uplink if the transmission direction with the highest priority is uplink, and determines the transmission direction of the subframe with uncertain uplink and downlink transmission directions as downlink if the transmission direction with the highest priority is downlink.

Secondly, the terminal determines the transmission direction of the subframe with uncertain uplink and downlink transmission directions according to the received time sequence relation of the downlink scheduling signaling and the uplink scheduling signaling which are issued by the base station aiming at the subframe with uncertain uplink and downlink transmission directions.

For example, the terminal determines that the scheduling signaling received at the latest for the subframe whose uplink and downlink transmission directions are uncertain is a downlink scheduling signaling or an uplink scheduling signaling, determines that the transmission direction of the subframe whose uplink and downlink transmission directions are uncertain is an uplink if the scheduling signaling is an uplink scheduling signaling, and determines that the transmission direction of the subframe whose uplink and downlink transmission directions are uncertain is a downlink if the scheduling signaling is a downlink scheduling signaling.

Preferably, before step 40, the terminal may perform one of the following two methods to determine a subframe with a determined transmission direction in the uplink and downlink overlapped subframes and a transmission direction corresponding to the subframe:

firstly, when a transmission subframe of a deterministic signal or a channel configured by a base station is overlapped with an uplink overlapped subframe and a downlink overlapped subframe, the uplink overlapped subframe and the downlink overlapped subframe are subframes with determined transmission directions, and a terminal determines the transmission directions of the uplink overlapped subframe and the downlink overlapped subframe according to the transmission directions of the deterministic signal or the channel;

secondly, the base station configures the transmission direction of the uplink and downlink overlapped subframes through the high-level signaling, and the terminal determines the transmission direction of the uplink and downlink overlapped subframes according to the high-level signaling configuration of the base station.

And executing steps 40 to 41 when other uplink and downlink overlapped subframes except the subframe determined by the uplink and downlink transmission direction determined according to the two methods are uplink and downlink transmission direction uncertain subframes.

An example of the first method is as follows:

if the deterministic signal or the channel is a Scheduling Request (SR) or periodic Channel State Information (CSI) or a semi-persistent scheduling physical uplink shared channel (SPS PUSCH) or an uplink Sounding Signal (SRs), the transmission direction of the uplink and downlink overlapped subframe is uplink, and the PDCCH is not detected and/or the PDSCH is received in the uplink and downlink overlapped subframe;

if the deterministic signal or channel is a semi-persistent scheduling physical downlink shared channel (SPSPDSCH), the transmission direction of the uplink and downlink overlapped sub-frame is downlink, and a PDCCH and/or a received PDSCH are/is detected in the uplink and downlink overlapped sub-frame;

if the deterministic signal or channel is a Physical Random Access Channel (PRACH), then: when the subframe is a subframe 6 and the uplink and downlink overlapped subframe is a special subframe, detecting a PDCCH and/or receiving a PDSCH in a downlink special time slot in the uplink and downlink overlapped subframe, and sending a PRACH in an uplink special time slot in the uplink and downlink overlapped subframe; and when the subframe is not the subframe 6, not detecting the PDCCH and/or receiving the PDSCH in the uplink and downlink overlapped subframe.

In the method, the terminal sends ACK/NACK corresponding to downlink data only in the subframe corresponding to uplink transmission or the uplink and downlink overlapped subframe used for uplink transmission of all carriers; and/or the presence of a gas in the gas,

and the terminal sends the ACK/NACK corresponding to the uplink data only in the subframe corresponding to the downlink transmission or the uplink and downlink overlapped subframe used for the downlink transmission of all the carriers.

Referring to fig. 5, an embodiment of the present invention further provides a method for scheduling data transmission in a carrier aggregation system, including the following steps:

step 50: before sending a downlink scheduling signaling of a subframe with uncertain uplink and downlink transmission directions to a terminal, a base station determines whether an uplink scheduling signaling of the subframe with uncertain uplink and downlink transmission directions is sent;

step 51: and when the uplink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction is determined to be sent, forbidding sending the downlink scheduling signaling of the subframe with the overlapped uplink and downlink in the subframe with the uncertain uplink and downlink transmission direction, thereby avoiding the UE from simultaneously carrying out uplink and downlink data transmission in the subframe with the uncertain uplink and downlink transmission direction.

If it is determined that the uplink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction is not sent, the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction can be sent in the subframe with the uncertain uplink and downlink transmission direction.

The present invention is described in detail below:

in-band (inter-band) carrier aggregation is performed, and when TDD uplink and downlink configurations are different on different bands, for a UE that cannot support uplink and downlink simultaneous transmission, uplink and downlink overlapping may exist in

subframes

3, 4, 6, 7, 8, and 9. Because the UL grant is always sent in advance, and the UL grant in the LTE system needs to be sent at least 4ms in advance, the UE can dynamically determine the transmission direction of the uplink and downlink overlapping subframes before the uplink and downlink overlapping subframes arrive, that is, the UE operates according to the following method:

first, uplink and downlink overlapping subframes can be divided into two categories: the method comprises the steps of transmitting uplink and downlink overlapped subframes with determined transmission directions and transmitting uplink and downlink overlapped subframes with determined transmission directions, wherein the uplink and downlink overlapped subframes with determined transmission directions can not exist. The UE can know in advance the uplink and downlink overlapping subframes determined by the transmission direction according to the following two methods:

the method comprises the following steps: determining the transmission direction of uplink and downlink overlapped subframes according to the transmission subframes of a deterministic signal or a channel configured in advance by a system; for example:

if the uplink and downlink overlapped subframes coincide with the subframes, which are configured by the system in a semi-static manner and used for transmitting, for example, SR, periodic CSI, spspuusch, SRs, the uplink and downlink overlapped subframes may be regarded as uplink subframes;

if the uplink and downlink overlapped subframes coincide with a subframe configured in a semi-static state by a system and used for transmitting, for example, an SPS PDSCH, the uplink and downlink overlapped subframes can be regarded as downlink subframes;

if the uplink and downlink overlapping subframes are overlapped with the PRACH transmission subframe, then:

if the subframe is subframe 6, the uplink and downlink overlapped subframe is a special subframe, and the PDCCH and/or the PDSCH can be detected in the common downlink transmission part in the uplink and downlink overlapped subframe. For example, if subframe 6 in band1 is a special subframe, where DwPTS occupies the first 19760Ts in the subframe, UpPTs occupies the second 2192Ts in the subframe, and subframe 6 in band2 is a downlink subframe, at this time, the UE may detect a PDCCH and/or receive a PDSCH in the first 19760Ts in subframe 6 in band1 and band2, and transmit a PRACH in the second 2192Ts in subframe 6 in band 1.

And if the subframe is not the subframe 6, the uplink and downlink overlapped subframe is regarded as an uplink subframe.

The method 2 comprises the following steps: and determining the transmission direction of the uplink and downlink overlapped subframes according to the high-level configuration signaling of the base station.

Uplink ACK/NACK (i.e., ACK/NACK corresponding to a dynamically scheduled PDSCH, an SPS PDSCH, and a PDCCH indicating SPS resource release) information is not transmitted in uplink and downlink overlapped subframes with an uncertain transmission direction, i.e., is transmitted only in subframes (such as subframe 2 and subframe 7 in fig. 6) where all carriers correspond to uplink transmission or uplink and downlink overlapped subframes where the UE determines to be used for uplink transmission.

The downlink ACK/NACK (i.e., the ACK/NACK corresponding to the PUSCH) information is not sent in the uplink and downlink overlapped subframes with uncertain transmission direction, that is, only sent in the subframes with all carriers corresponding to downlink transmission (e.g.,

subframes

0, 1, 5, and 6 in fig. 6) or the uplink and downlink overlapped subframes determined by the UE to be used for downlink transmission.

Then, for uplink and downlink overlapped subframes n, n +1 with uncertain continuous transmission directions, a.

The method comprises the following steps: if the UE receives a UL grant corresponding to a subframe n + x (x is more than or equal to 0 and less than or equal to k) before the subframe n, the UE transmits a PUSCH on the subframe n + x in a carrier wave corresponding to the UL grant, and does not detect a PDCCH and/or receive a PDSCH on a carrier wave corresponding to downlink transmission in the subframe; if the UE does not receive the UL grant corresponding to the subframe n + x (x is more than or equal to 0 and less than or equal to k) before the subframe n, the UE detects the PDCCH and/or receives the PDSCH on the carrier corresponding to downlink transmission in the subframe.

The second method comprises the following steps:

if the UE receives a UL grant corresponding to a subframe n + x (x is more than or equal to 0 and less than or equal to k) before the subframe n, the UE does not detect a PDCCH and/or receive a PDSCH on a carrier corresponding to downlink transmission in the subframe n-n + x;

if the UE does not receive the UL grant corresponding to the sub-frame n + x-n + k (x is more than or equal to 0 and less than or equal to k) before the sub-frame n, the UE detects the PDCCH and/or receives the PDSCH on the carrier corresponding to downlink transmission in the sub-frame n + x-n + k.

Further, if the system supports multi-subframe scheduling or cross-subframe scheduling, and the UE can know all scheduling information (including DL grant and UL grant) of the subframe with uncertain uplink and downlink transmission directions before the arrival of the subframe with uncertain uplink and downlink transmission directions, taking fig. 6 as an example, the base station transmits scheduling information of a carrier on a corresponding band2 through a carrier in a band1, and the UE can know the corresponding UL grant and DL grant before the arrival of

subframes

3 and 4, then:

if the UE does not receive the corresponding UL grant or the corresponding DLgrant for the overlapping subframe n + x, the UE may regard the subframe n + x as a blank subframe and does not need to receive and transmit data in the corresponding subframe, thereby reducing the power consumption of the UE;

if the UE receives the corresponding UL grant but does not receive the corresponding DL grant for the uplink and downlink overlapped subframe n + x, the UE sends the PUSCH on the carrier wave which is corresponding to uplink transmission in the subframe n + x;

if the UE does not receive the corresponding UL grant but receives the corresponding DL grant for the uplink and downlink overlapped subframe n + x, the UE detects the PDCCH and/or receives the PDSCH on the carrier which is corresponding to downlink transmission in the subframe n + x;

if the base station sends a DL grant and a UL grant respectively for the same uplink and downlink overlapping subframe n + x, the following processing may be performed:

the system presets a transmission direction priority, for example, if DL transmission is prior to UL transmission, after receiving both DL grant and UL grant, the UE preferentially receives DL data without performing UL transmission; or,

according to the timing relationship of the scheduling signaling, the UE shall be subject to the last received scheduling signaling, for example, UL grant is transmitted in the sub-frame m0, DL grant is transmitted in the sub-frame m1, and m1 > m0, then the UE preferentially receives DL data without UL transmission.

The first embodiment is as follows:

corresponding to the first method. As shown in fig. 6, the UL grant corresponding to subframe 8 is transmitted in subframe 1, and the UL grant corresponding to subframe 9 is transmitted in subframe 5.

If the UE receives a UL grant for the base station in subframe 1, which is used to schedule the UE to transmit PUSCH on the carrier of band1 in subframe 8, but does not receive the UL grant in subframe 5, the UE will transmit PUSCH on subframe 8 in band1, and will detect PDCCH and/or receive PDSCH in subframe 9 of band 2.

If the UE receives no UL grant from the base station in subframe 1 and receives a UL grant in subframe 5, the UE will detect the PDCCH and/or receive the PDSCH in subframe 8 in band2 and transmit the PUSCH on subframe 9 in band 1.

If the UE does not receive the base station's UL grant in both

subframes

1 and 5, the UE will detect the PDCCH and/or receive the PDSCH in

subframes

8 and 9 on band 2.

If the UE receives the base station's UL grant in both

subframes

1 and 5, the UE will send PUSCH in

subframes

8 and 9 on band 1.

Example two:

corresponding to the second method.

If the UE receives a UL grant of the base station in subframe 5, which is used to schedule the UE to transmit PUSCH on the carrier of band1 in subframe 9, the UE regards both

subframes

8 and 9 as uplink subframes without detecting PDCCH and/or receiving PDSCH on the carrier of band 2.

If the UE does not receive the UL grant of the base station in

subframes

1 and 5, the UE regards

subframes

8 and 9 as downlink subframes, and detects the PDCCH and/or receives the PDSCH on the carrier on band2 in the subframes.

If the UE receives the UL grant of the base station in subframe 1, which is used to schedule the UE to transmit PUSCH on the carrier of band1 in subframe 8, but does not receive the UL grant in subframe 5, the UE regards subframe 8 as an uplink subframe and regards subframe 9 as a downlink subframe.

Referring to fig. 7, an embodiment of the present invention further provides a terminal, where the terminal includes:

a scheduling signaling determining unit 70, configured to determine whether an uplink scheduling signaling sent by a base station and addressed to a subframe with an uncertain uplink and downlink transmission direction is received;

and a signal transmission unit 71, configured to transmit uplink data or receive downlink data using a subframe with an uncertain uplink and downlink transmission direction according to the determination result.

The signal transmission unit 71 is configured to:

if the terminal receives an uplink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction, the terminal sends uplink data on the carrier corresponding to uplink transmission in the subframe with the uncertain uplink and downlink transmission direction, otherwise, the terminal receives downlink data on the carrier corresponding to downlink transmission in the subframe with the uncertain uplink and downlink transmission direction and detects the PDCCH.

The signal transmission unit 71 is configured to:

if the terminal does not receive an uplink scheduling signaling issued by the base station for the uplink and downlink overlapped subframes for each subframe in the N continuous subframes with uncertain uplink and downlink transmission directions, detecting a PDCCH and/or receiving a PDSCH on a carrier corresponding to downlink transmission in each uplink and downlink overlapped subframe;

if the terminal receives an uplink scheduling signaling issued by the base station for the subframe with uncertain uplink and downlink transmission directions for at least one subframe of the continuous N subframes with uncertain uplink and downlink transmission directions, the terminal does not detect the PDCCH and receive the PDSCH in a critical subframe of the subframes with uncertain uplink and downlink transmission directions and a subframe before the critical subframe, and detects the PDCCH and receive the PDSCH on a carrier corresponding to downlink transmission in a subframe after the critical subframe; sending PUSCH on a carrier wave corresponding to uplink transmission in a subframe which receives corresponding uplink scheduling signaling in N subframes with uncertain uplink and downlink transmission directions; the critical subframe is a subframe which is uncertain in uplink and downlink transmission directions and corresponds to the latest received uplink scheduling signaling; and N is a positive integer.

The signal transmission unit 71 is configured to:

if the terminal receives an uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction and does not receive a downlink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the terminal sends a PUSCH on a carrier wave which is corresponding to uplink transmission in the uplink and downlink overlapped subframe;

if the terminal receives a downlink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction and does not receive an uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, receiving a detection PDCCH and/or receiving a PDSCH on a carrier corresponding to downlink transmission in the uplink and downlink overlapped subframe;

if the terminal does not receive a downlink scheduling signaling and an uplink scheduling signaling which are issued by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the subframe is a blank subframe, and the terminal does not receive and detect the PDCCH and/or receive the PDSCH in the subframe with the uncertain uplink and downlink transmission direction and does not send the PUSCH in the subframe with the uncertain uplink and downlink transmission direction;

if the terminal receives a downlink scheduling signaling and an uplink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, determining the transmission direction of the subframe with the uncertain uplink and downlink transmission direction according to a preset subframe transmission direction determining method, if the transmission direction is uplink, sending a Physical Uplink Shared Channel (PUSCH) on a carrier corresponding to uplink transmission in the subframe with the uncertain uplink and downlink transmission direction, and if the transmission direction is downlink, detecting a Physical Downlink Control Channel (PDCCH) and/or receiving a Physical Downlink Shared Channel (PDSCH) on the carrier corresponding to downlink transmission in the subframe with the uncertain uplink and downlink transmission direction.

The signal transmission unit 71 is configured to:

determining the transmission direction of the subframe with uncertain uplink and downlink transmission directions according to the preset transmission direction priority; or,

and determining the transmission direction of the uplink and downlink overlapped subframes according to the received configuration signaling of the base station.

The terminal further includes:

a subframe transmission direction determining unit 72, configured to further determine a subframe determined by an uplink and a downlink transmission direction in an uplink and downlink overlapped subframe and a transmission direction of the subframe before the scheduling signaling determining unit determines whether the uplink scheduling signaling sent by the base station for the subframe with an uncertain uplink and downlink transmission direction is received, where the subframe transmission direction determining unit includes:

when a transmission subframe of a deterministic signal or a channel configured by a base station is superposed with an uplink overlapped subframe and a downlink overlapped subframe, determining the transmission direction of the uplink overlapped subframe and the downlink overlapped subframe according to the transmission direction of the deterministic signal or the channel; or,

and determining the transmission direction of the uplink and downlink overlapped subframes according to the high-level signaling configuration of the base station.

The subframe transmission direction determining unit 72 is configured to:

if the deterministic signal or the channel is a scheduling request SR or a periodic channel state information CSI or a semi-persistent scheduling physical uplink shared channel (SPS) PUSCH or an uplink sounding signal (SRS), the transmission direction of the uplink and downlink overlapped sub-frame is uplink, and the PDCCH and/or the received PDSCH are not detected in the uplink and downlink overlapped sub-frame; or,

if the deterministic signal or the channel is a semi-persistent scheduling physical downlink shared channel (SPS) PDSCH, using the transmission direction of the uplink and downlink overlapped sub-frame as downlink, and detecting a PDCCH and/or receiving the PDSCH in the uplink and downlink overlapped sub-frame; or,

if the deterministic signal or channel is a Physical Random Access Channel (PRACH), then: when the subframe is a subframe 6, the uplink and downlink overlapped subframe is a special subframe, a PDCCH (physical downlink control channel) and/or a PDSCH (physical downlink shared channel) is detected and/or received in a downlink special time slot in the uplink and downlink overlapped subframe, and a PRACH (physical random access channel) is sent in an uplink special time slot in the uplink and downlink overlapped subframe; and when the subframe is not the subframe 6, the transmission direction of the uplink and downlink overlapped subframe is an uplink, and the PDCCH and/or the received PDSCH are not detected in the uplink and downlink overlapped subframe.

The signal transmission unit 71 is configured to:

sending ACK/NACK corresponding to downlink data only in a subframe corresponding to uplink transmission or an uplink and downlink overlapped subframe used for uplink transmission of all carriers; and/or the presence of a gas in the gas,

and sending the ACK/NACK corresponding to the uplink data only in the subframe corresponding to the downlink transmission or the uplink and downlink overlapped subframe used for the downlink transmission of all the carriers.

Referring to fig. 8, an embodiment of the present invention further provides a base station, where the base station includes:

a determining unit 80, configured to determine whether an uplink scheduling signaling of a subframe with an indeterminate uplink and downlink transmission direction has been sent before sending the downlink scheduling signaling of the subframe with the indeterminate uplink and downlink transmission direction to a terminal;

and a processing unit 81, configured to prohibit sending the downlink scheduling signaling of the subframe with the indeterminate uplink and downlink transmission direction in the subframe with the indeterminate uplink and downlink transmission direction when it is determined that the uplink scheduling signaling of the subframe with the indeterminate uplink and downlink transmission direction is sent.

In conclusion, the beneficial effects of the invention include:

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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations 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 include such modifications and variations.

Claims

1. A method for data transmission in a carrier aggregation system, the method comprising:

the terminal determines whether an uplink scheduling signaling which is sent by a base station and aims at a subframe with uncertain uplink and downlink transmission directions is received; the subframe with uncertain uplink and downlink transmission directions is a subframe without preset configuration or appointed transmission direction in uplink and downlink overlapped subframes; the uplink and downlink overlapped subframes comprise subframes with inconsistent transmission directions on different carriers when a terminal aggregates a plurality of frequency bands and different frequency bands support different TDD uplink/downlink subframe configurations;

2. The method of claim 1, wherein the terminal determines whether uplink scheduling signaling for subframes with uncertain uplink and downlink transmission directions sent by a base station is received; the terminal, according to the determination result, using the subframe with the uncertain uplink and downlink transmission direction to send uplink data or receive downlink data includes:

if the terminal receives an uplink scheduling signaling sent by the base station for the subframe with the uncertain uplink and downlink transmission direction, the terminal sends the PUSCH on the carrier wave which is corresponding to the uplink transmission in the subframe with the uncertain uplink and downlink transmission direction, otherwise, the terminal detects the PDCCH and/or receives the PDSCH on the carrier wave which is corresponding to the downlink transmission in the subframe with the uncertain uplink and downlink transmission direction.

3. The method of claim 1, wherein the terminal determines whether uplink scheduling signaling for subframes with uncertain uplink and downlink transmission directions sent by a base station is received; the terminal, according to the determination result, using the subframe with the uncertain uplink and downlink transmission direction to send uplink data or receive downlink data includes:

if the terminal does not receive an uplink scheduling signaling issued by the base station for the subframe with uncertain uplink and downlink transmission directions for each subframe of the N continuous subframes with uncertain uplink and downlink transmission directions, the terminal detects a PDCCH and/or receives a PDSCH on a carrier corresponding to downlink transmission in each subframe with uncertain uplink and downlink transmission directions;

if the terminal receives an uplink scheduling signaling issued by the base station for the subframe with uncertain uplink and downlink transmission directions for at least one subframe of the continuous N subframes with uncertain uplink and downlink transmission directions, the terminal does not detect the PDCCH and/or receive the PDSCH in a critical subframe of the subframes with uncertain uplink and downlink transmission directions and a subframe before the critical subframe, and receives the PDCCH and/or receive the PDSCH on a carrier corresponding to downlink transmission in a subframe after the critical subframe; sending PUSCH on a carrier wave corresponding to uplink transmission in a subframe which receives corresponding uplink scheduling signaling in N subframes with uncertain uplink and downlink transmission directions; the critical subframe is a subframe which is uncertain in uplink and downlink transmission directions and corresponds to the latest received uplink scheduling signaling; and N is a positive integer.

4. The method of claim 1, wherein the terminal determines whether uplink scheduling signaling for subframes with uncertain uplink and downlink transmission directions sent by a base station is received; the terminal, according to the determination result, using the subframe with the uncertain uplink and downlink transmission direction to send uplink data or receive downlink data includes:

if the terminal receives an uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction and does not receive a downlink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the terminal sends a PUSCH on a carrier wave which is corresponding to uplink transmission in the subframe with the uncertain uplink and downlink transmission direction;

5. The method of claim 4, wherein the determining, by the terminal according to a preset subframe transmission direction determining method, the transmission direction of the subframe with the uncertain uplink and downlink transmission directions comprises:

the terminal determines the transmission direction of the subframe with uncertain uplink and downlink transmission directions according to the preset transmission direction priority; or,

and the terminal determines the transmission direction of the subframe with the uncertain uplink and downlink transmission directions according to the received time sequence relationship of the downlink scheduling signaling and the uplink scheduling signaling which are issued by the base station aiming at the subframe with the uncertain uplink and downlink transmission directions.

6. The method of claim 1, wherein before the terminal determines whether to receive an uplink scheduling signaling sent by a base station for a subframe with an uncertain uplink and downlink transmission direction, further determining a subframe with an uncertain uplink and downlink transmission direction and a transmission direction of the subframe in uplink and downlink overlapped subframes, comprises:

when a transmission subframe of a deterministic signal or a channel configured by a base station is superposed with an uplink overlapped subframe and a downlink overlapped subframe, a terminal determines the transmission direction of the uplink overlapped subframe and the downlink overlapped subframe according to the transmission direction of the deterministic signal or the channel; or

And the terminal determines the transmission direction of the uplink and downlink overlapped subframes according to the high-level signaling configuration of the base station.

7. The method of claim 6, wherein if the deterministic signal or channel is a scheduling request SR or a periodic channel state information CSI or a semi-persistent scheduled physical uplink shared channel SPS PUSCH or an uplink sounding signal SRs, the transmission direction of the uplink and downlink overlapped sub-frame is uplink, and the terminal does not detect a PDCCH and/or receive a PDSCH in the uplink and downlink overlapped sub-frame; or,

if the deterministic signal or the channel is a semi-persistent scheduling physical downlink shared channel (SPS), the transmission direction of the uplink and downlink overlapped sub-frame is downlink, and the terminal detects a Physical Downlink Control Channel (PDCCH) and/or receives a Physical Downlink Shared Channel (PDSCH) in the uplink and downlink overlapped sub-frame; or,

if the deterministic signal or channel is a Physical Random Access Channel (PRACH), then: when the subframe is a subframe 6, the uplink and downlink overlapped subframe is a special subframe, the terminal detects a PDCCH and/or receives a PDSCH in a downlink special time slot in the uplink and downlink overlapped subframe, and sends a PRACH in an uplink special time slot in the uplink and downlink overlapped subframe; and when the subframe is not the subframe 6, the transmission direction of the uplink and downlink overlapped subframe is an uplink, and the terminal does not detect the PDCCH and/or receive the PDSCH in the uplink and downlink overlapped subframe.

8. The method of claim 1, further comprising:

the terminal sends ACK/NACK corresponding to the downlink data only in the subframe corresponding to the uplink transmission or the uplink and downlink overlapped subframe used for the uplink transmission; and/or the presence of a gas in the gas,

9. A method for scheduling data transmission in a carrier aggregation system, the method comprising:

before sending a downlink scheduling signaling of a subframe with uncertain uplink and downlink transmission directions to a terminal, a base station determines whether an uplink scheduling signaling of the subframe with uncertain uplink and downlink transmission directions is sent; the subframe with uncertain uplink and downlink transmission directions is a subframe without preset configuration or appointed transmission direction in uplink and downlink overlapped subframes; the uplink and downlink overlapped subframes comprise subframes with inconsistent transmission directions on different carriers when a terminal aggregates a plurality of frequency bands and different frequency bands support different TDD uplink/downlink subframe configurations;

and when the uplink scheduling signaling of the subframe is determined to be sent, forbidding sending the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission directions in the subframe with the uncertain uplink and downlink transmission directions.

10. A terminal, characterized in that the terminal comprises:

a scheduling signaling determining unit, configured to determine whether an uplink scheduling signaling sent by a base station and addressed to a subframe with an uncertain uplink and downlink transmission direction is received; the subframe with uncertain uplink and downlink transmission directions is a subframe without preset configuration or appointed transmission direction in uplink and downlink overlapped subframes; the uplink and downlink overlapped subframes comprise subframes with inconsistent transmission directions on different carriers when a terminal aggregates a plurality of frequency bands and different frequency bands support different TDD uplink/downlink subframe configurations;

11. The terminal of claim 10, wherein the signal transmission unit is configured to:

12. The terminal of claim 10, wherein the signal transmission unit is configured to:

if the terminal does not receive an uplink scheduling signaling issued by the base station for the subframe with uncertain uplink and downlink transmission directions for each subframe of the N continuous subframes with uncertain uplink and downlink transmission directions, detecting a PDCCH and/or receiving a PDSCH on a carrier which is corresponding to downlink transmission in each uplink and downlink overlapped subframe;

if the terminal receives an uplink scheduling signaling sent by the base station for the subframe with uncertain uplink and downlink transmission directions for at least one subframe of the continuous N subframes with uncertain uplink and downlink transmission directions, the terminal does not detect the PDCCH and/or receive the PDSCH in a critical subframe of the subframes with uncertain uplink and downlink transmission directions and a subframe before the critical subframe, and detects the PDCCH and/or receive the PDSCH on a carrier corresponding to downlink transmission in a subframe after the critical subframe; sending PUSCH on a carrier wave corresponding to uplink transmission in a subframe which receives corresponding uplink scheduling signaling in N subframes with uncertain uplink and downlink transmission directions; the critical subframe is a subframe which is uncertain in uplink and downlink transmission directions and corresponds to the latest received uplink scheduling signaling; and N is a positive integer.

13. The terminal of claim 10, wherein the signal transmission unit is configured to:

if the terminal receives a downlink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction and does not receive an uplink scheduling signaling sent by the base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, detecting a PDCCH and/or receiving a PDSCH on a carrier wave which is corresponding to downlink transmission in the subframe with the uncertain uplink and downlink transmission direction;

if the terminal does not receive a downlink scheduling signaling and an uplink scheduling signaling which are issued by a base station aiming at the subframe with the uncertain uplink and downlink transmission direction before the subframe with the uncertain uplink and downlink transmission direction, the subframe is a blank subframe, a PDCCH (physical Downlink control channel) and/or a PDSCH (physical Downlink shared channel) are not detected and/or a PUSCH (physical Downlink shared channel) is not received in the subframe with the uncertain uplink and downlink transmission direction, and the PUSCH is not sent in the subframe with the uncertain uplink and downlink;

14. The terminal of claim 13, wherein the transmitting unit determines the transmission direction of the subframe with uncertain uplink and downlink transmission directions according to a preset subframe transmission direction determining method, and is configured to:

and determining the transmission direction of the subframe with the uncertain uplink and downlink transmission directions according to the received time sequence relationship of the downlink scheduling signaling and the uplink scheduling signaling which are issued by the base station aiming at the subframe with the uncertain uplink and downlink transmission directions.

15. The terminal of claim 10, wherein the terminal further comprises:

a subframe transmission direction determining unit, configured to further determine a subframe determined by an uplink and a downlink transmission direction in an uplink and downlink overlapped subframe and a transmission direction of the subframe before the scheduling signaling determining unit determines whether the uplink scheduling signaling, which is sent by the base station and is for the subframe with an uncertain uplink and downlink transmission direction, is received, where the subframe transmission direction determining unit includes:

16. The terminal of claim 15, wherein the subframe transmission direction determining unit is configured to:

17. The terminal of claim 10, wherein the signal transmission unit is configured to:

18. A base station, comprising:

a determining unit, configured to determine whether an uplink scheduling signaling of a subframe with an uncertain uplink and downlink transmission direction has been sent before sending the downlink scheduling signaling of the subframe with the uncertain uplink and downlink transmission direction to a terminal; the subframe with uncertain uplink and downlink transmission directions is a subframe without preset configuration or appointed transmission direction in uplink and downlink overlapped subframes; the uplink and downlink overlapped subframes comprise subframes with inconsistent transmission directions on different carriers when a terminal aggregates a plurality of frequency bands and different frequency bands support different TDD uplink/downlink subframe configurations;