CN106686731B

CN106686731B - Data transmission method and device in half-duplex FDD

Info

Publication number: CN106686731B
Application number: CN201510753630.0A
Authority: CN
Inventors: 邢艳萍; 高雪娟
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2015-11-06
Filing date: 2015-11-06
Publication date: 2020-03-24
Anticipated expiration: 2035-11-06
Also published as: WO2017076113A1; CN106686731A

Abstract

The invention discloses a data transmission method and a data transmission device in half-duplex FDD, which are used for solving the problem of inconsistent understanding of a network side and a terminal on a downlink timing relationship caused by dynamic scheduling in the half-duplex FDD. The method comprises the following steps: determining configuration information of a radio frame, wherein the configuration information configures the number of uplink subframes and downlink subframes in the radio frame and the position information of the uplink subframes and the downlink subframes in the radio frame; and performing uplink and downlink data transmission according to the configuration information of the wireless frame.

Description

Data transmission method and device in half-duplex FDD

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus in a half-duplex FDD.

Background

Frequency Division Duplex (FDD) uplink and downlink in a Long Term Evolution (Long Term Evolution, LTE) system work at different carrier frequencies, a structure of a radio frame of LTE FDD is shown in fig. 1, one radio frame includes 10 subframes, and the subframes are numbered according to the sequence from 0 to 9.

A half-duplex FDD terminal (UE) does not support simultaneous downlink reception and uplink transmission, and in a specific subframe, the half-duplex FDD UE can only perform downlink reception or only perform uplink transmission. FDD means that uplink and downlink work in different frequency domains, FDD is further divided into full duplex and half duplex, the full duplex can perform downlink reception and uplink transmission simultaneously, and the half duplex cannot perform downlink reception and uplink transmission simultaneously.

In the existing mechanism, a half-duplex FDD UE determines whether a subframe is an uplink subframe or a downlink subframe according to scheduling of a base station. Specifically, the half-duplex FDD UE determines, in a radio frame, a subframe that needs to be uplink-transmitted and is determined according to scheduling of the base station as an uplink subframe, and defaults that other subframes are downlink subframes. In addition, the half-duplex FDD requires a certain protection time in uplink and downlink handover.

Two types of half-duplex FDD operation are currently defined in LTE. For the half-duplex FDD operation of the type A, the protection time of downlink receiving and uplink sending is a part of a downlink subframe which is before an uplink subframe and is adjacent to the uplink subframe; for half duplex FDD operation of type B, the guard time for downlink reception and uplink transmission is: a downlink subframe which is before the uplink subframe and adjacent to the uplink subframe, wherein the protection time from uplink transmission to downlink reception is as follows: and a downlink subframe which is behind the uplink subframe and is adjacent to the uplink subframe, wherein the downlink subframe corresponding to the protection time is called a protection subframe.

In the enhanced MTC (Machine Type Communication) project discussed in 3GPP Rel-13, it is determined that a Downlink adopts cross-subframe scheduling, that is, a Physical Downlink Shared Channel (PDSCH) scheduled by a Physical Downlink Control Channel (M-PDCCH) for sending a Downlink scheduling grant and the M-PDCCH are in different subframes, where the M-PDCCH refers to a PDCCH (Physical Downlink Control Channel) for MTC. Specifically, the PDSCH starts in the second available downlink subframe after the end of the M-PDCCH. For half-duplex FDD, the available downlink subframes are all subframes except uplink subframes, guard subframes, and network-configured unavailable subframes.

For half-duplex FDD, the network-configured unavailable subframes are configured semi-statically by the network side, and the uplink subframes and the protected subframes depend on the network-side scheduling. If the terminal fails to detect or falsely detects the scheduling information of the base station, it may cause the base station and the terminal to have different understanding on the timing of the downlink HARQ (Hybrid Automatic Repeat reQuest).

In a specific example, assuming that the network side does not semi-statically configure any subframe as an unavailable subframe, Downlink transmission of the network side adopts a scheduling timing relationship shown in fig. 2, Downlink Grant (DG) information is carried on an M-PDCCH, Downlink data transmission corresponding to DGx is Dx, Downlink data is carried on a PDSCH, and Hybrid Automatic Repeat Request-acknowledgement (HARQ-ACK) feedback corresponding to the Downlink data is denoted by Ax. According to the timing relationship shown in fig. 2, the PDSCH starts from the second available downlink subframe after the M-PDCCH ends, then the PDSCH corresponding to DG1 is in the second subframe after the subframe where DG1 is located, the PDSCH corresponding to DG2 is in the second subframe after the subframe where DG2 is located, and the PDSCH corresponding to DG3 is in the second subframe after the subframe where DG3 is located, because there are 5 unavailable downlink subframes including uplink subframes and guard subframes between DG4, DG5 and the corresponding PDSCH, the PDSCH corresponding to DG4 and DG5 is in the 7 th subframe after the subframe where the corresponding M-PDCCH is located, respectively.

Once the terminal and the network side have inconsistent understanding of the unavailable downlink subframe, the terminal and the network side may have ambiguous understanding of HARQ timing, for example, if the UE fails to detect or has detected a DG3 incorrectly, D3 may not be received in subframe 4 (i.e., the 5 th subframe), and HARQ-ACK corresponding to D3 may not be fed back in subframe 8 (i.e., the 9 th subframe). The terminal determines the subframe 8 as a protection subframe for converting uplink transmission into downlink reception, determines the subframe 9 (i.e., the 10 th subframe) as a second available downlink subframe after the subframe 3 (i.e., the 4 th subframe), and determines the subframe 10 as a second available downlink subframe after the subframe 4, where the timing relationship of downlink transmission at the terminal side is shown in fig. 3, so that the UE cannot successfully receive the data packets scheduled by the DG4 and the DG 5. Since there is a fixed timing relationship between the PDSCH reception and the corresponding HARQ-ACK feedback, the terminal side HARQ-ACK feedback for D4 and D5 may also be different from the base station's understanding, possibly resulting in PUCCH resource collision.

In order to avoid ambiguity in understanding the HARQ timing relationship between the network side and the terminal, it is necessary to ensure that there is no uplink subframe or guard subframe between the M-PDCCH and the corresponding PDSCH, as in the downlink scheduling timing relationship shown in fig. 4, there is no uplink subframe or guard subframe between the DG4 and the corresponding D4. However, this approach results in downlink subframes not being fully used for downlink data transmission, and only a maximum of 3 downlink HARQ processes can be transmitted within a 10 millisecond (ms) period, and assuming that a maximum of one transport block with a transport block size of 1000 bits is transmitted per subframe, the downlink peak rate is only 300k bits per second (bps).

Disclosure of Invention

The embodiment of the invention provides a data transmission method and device in half-duplex FDD, which are used for solving the problem that understanding of a network side and a terminal on a downlink timing relationship is inconsistent due to dynamic scheduling in the half-duplex FDD.

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

the embodiment of the invention provides a data transmission method in half-duplex FDD, which comprises the following steps:

determining configuration information of a radio frame, wherein the configuration information configures the number of uplink subframes and downlink subframes in the radio frame and the position information of the uplink subframes and the downlink subframes in the radio frame;

and performing uplink and downlink data transmission according to the configuration information of the wireless frame.

Preferably, the number of downlink subframes in the radio frame configured in the configuration information is greater than or equal to 6.

Preferably, the radio frame configured in the configuration information is composed of 6 downlink subframes and 4 uplink subframes; or, the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes; or, the radio frame configured in the configuration information is composed of 9 downlink subframes and 1 uplink subframe.

Preferably, the location information of the uplink subframe and the downlink subframe configured in the configuration information in the radio frame is determined according to a protocol agreement or according to a notification from a network side.

Preferably, the configuration information configures a downlink subframe, which is located before the uplink subframe and adjacent to the uplink subframe in the radio frame, as a guard subframe;

alternatively, the first and second electrodes may be,

and configuring a downlink subframe which is positioned in front of the uplink subframe and adjacent to the uplink subframe as a protection subframe and a downlink subframe which is positioned behind the uplink subframe and adjacent to the uplink subframe as a protection subframe in the configuration information.

Preferably, the determining the configuration information of the radio frame includes:

determining configuration information of the wireless frame according to protocol agreement; alternatively, the first and second electrodes may be,

determining configuration information of the wireless frame according to the notification message of the network side; alternatively, the first and second electrodes may be,

and determining the configuration information of the wireless frame according to the scheduling of the network side.

determining that each radio frame has the same configuration information; alternatively, the first and second electrodes may be,

and determining that the partial radio frames have the same configuration information.

Preferably, if the radio frame configured in the configuration information is composed of 6 downlink subframes and 4 uplink subframes, performing uplink and downlink data transmission according to the configuration information of the radio frame includes:

if the transmission of a downlink data packet is finished in the nth subframe of the wireless frame, starting to transmit hybrid automatic repeat request acknowledgement information (HARQ-ACK) corresponding to the downlink data packet in the (n + 5) th subframe; and

if the uplink scheduling grant transmission is finished in the mth subframe of the wireless frame, starting to transmit uplink data corresponding to the uplink scheduling grant in the (m + 5) th subframe; and

and if the uplink data is transmitted in the kth subframe of the wireless frame, starting to transmit the HARQ-ACK corresponding to the uplink data in the (k + 5) th subframe.

Preferably, if the (n + 5) th subframe is an unavailable subframe, transmitting HARQ-ACK corresponding to the downlink data packet in a first available subframe after the (n + 5) th subframe;

if the m +5 th subframe is an unavailable subframe, transmitting uplink data corresponding to the uplink scheduling grant at a first available subframe after the m +5 th subframe;

and if the (k + 5) th subframe is an unavailable subframe, transmitting the HARQ-ACK corresponding to the uplink data in the first available subframe after the (k + 5) th subframe.

Preferably, if the radio frame configured in the configuration information is composed of 9 downlink subframes and 1 uplink subframe, performing uplink and downlink data transmission according to the configuration information of the radio frame includes:

and carrying hybrid automatic repeat request acknowledgement information (HARQ-ACK) corresponding to downlink data transmitted by a plurality of downlink subframes in the uplink subframe in the wireless frame.

Preferably, if the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes, performing uplink and downlink data transmission according to the configuration information of the radio frame includes:

and respectively carrying hybrid automatic repeat request acknowledgement information (HARQ-ACK) corresponding to downlink data transmitted by a plurality of downlink subframes in each uplink subframe in the wireless frame.

Preferably, the method for carrying hybrid automatic repeat request acknowledgement information HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes in the uplink subframe includes:

and carrying hybrid automatic repeat request acknowledgement information HARQ-ACK corresponding to the downlink data transmitted by the plurality of downlink subframes in the uplink subframe through an ACK/NACK combination or ACK/NACK multiplexing mode.

An embodiment of the present invention further provides a data transmission apparatus in half-duplex FDD, including:

a processing module, configured to determine configuration information of a radio frame, where the configuration information configures respective numbers of uplink subframes and downlink subframes in the radio frame and location information of the uplink subframes and the downlink subframes in the radio frame;

and the transmission module is used for transmitting uplink and downlink data according to the configuration information of the wireless frame.

alternatively, the first and second electrodes may be,

Preferably, the processing module is specifically configured to:

Preferably, the transmission module is specifically configured to:

if the radio frame configured in the configuration information consists of 6 downlink subframes and 4 uplink subframes,

Preferably, the transmission module is specifically configured to:

if the (n + 5) th subframe is an unavailable subframe, transmitting HARQ-ACK corresponding to the downlink data packet in a first available subframe after the (n + 5) th subframe;

Preferably, the transmission module is specifically configured to:

if the wireless frame is configured in the configuration information and consists of 9 downlink subframes and 1 uplink subframe, hybrid automatic repeat request acknowledgement information HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes is borne in the uplink subframe in the wireless frame;

if the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes, hybrid automatic repeat request acknowledgement information HARQ-ACK corresponding to downlink data transmitted by the multiple downlink subframes is respectively loaded in each uplink subframe in the radio frame.

The embodiment of the present invention further provides a device, including a processor, a memory and a transceiver, where the transceiver is configured to receive and transmit data under the control of the processor, the memory stores a preset program, the processor is configured to read the program in the memory, and execute the following processes according to the program:

and instructing the transceiver to perform uplink and downlink data transmission according to the configuration information of the wireless frame.

or configuring, in the configuration information, a downlink subframe which is located before the uplink subframe and adjacent to the uplink subframe as a protected subframe, and a downlink subframe which is located after the uplink subframe and adjacent to the uplink subframe as a protected subframe.

Preferably, the processor determines the configuration information of the wireless frame according to protocol agreement; or determining the configuration information of the wireless frame according to the notification message of the network side; or determining the configuration information of the wireless frame according to the scheduling of the network side.

Preferably, the processor determines that each radio frame has the same configuration information; or, determining that part of the radio frames have the same configuration information.

Preferably, if the wireless frame configured in the configuration information is composed of 6 downlink subframes and 4 uplink subframes, the processor instructs the transceiver to start transmitting HARQ-ACK corresponding to the downlink data packet in the (n + 5) th subframe if instructing the transceiver to end transmission of one downlink data packet in the nth subframe of the wireless frame; and

if the transceiver is instructed to finish the transmission of the uplink scheduling grant in the mth subframe of the wireless frame, the transceiver is instructed to start to transmit uplink data corresponding to the uplink scheduling grant in the (m + 5) th subframe; and

and if the transceiver is instructed to transmit the uplink data in the kth subframe of the wireless frame, the transceiver is instructed to start to transmit the HARQ-ACK corresponding to the uplink data in the (k + 5) th subframe.

Preferably, if the n +5 th subframe is an unavailable subframe, the processor instructs the transceiver to transmit the HARQ-ACK corresponding to the downlink data packet in the first available subframe after the n +5 th subframe;

if the m +5 th subframe is an unavailable subframe, the processor instructs the transceiver to transmit uplink data corresponding to the uplink scheduling grant in a first available subframe after the m +5 th subframe;

and if the (k + 5) th subframe is an unavailable subframe, the processor instructs the transceiver to transmit the HARQ-ACK corresponding to the uplink data in the first available subframe after the (k + 5) th subframe.

Preferably, if the radio frame configured in the configuration information is composed of 9 downlink subframes and 1 uplink subframe, the processor instructs the transceiver to carry HARQ-ACKs corresponding to downlink data transmitted by a plurality of downlink subframes in the uplink subframe of the radio frame;

if the wireless frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes, the processor instructs the transceiver to respectively bear HARQ-ACK corresponding to downlink data transmitted by the multiple downlink subframes in each uplink subframe in the wireless frame.

Based on the above technical solution, in the embodiments of the present invention, uplink and downlink data transmission is performed according to the number of the uplink subframes and the downlink subframes configured in the configuration information of the radio frame and the location information of the uplink subframes and the downlink subframes configured in the radio frame, so that a problem of inconsistent understanding of a network side and a terminal on a downlink timing relationship due to dynamic scheduling in a half-duplex FDD is solved, downlink resources can be fully utilized, and a downlink data transmission rate is improved.

Drawings

Fig. 1 is a schematic structural diagram of a radio frame of LTE FDD;

FIG. 2 is a diagram illustrating a scheduling timing relationship of network-side downlink transmission;

fig. 3 is a schematic diagram of a timing relationship of downlink transmission at a terminal side;

FIG. 4 is a diagram illustrating a downlink scheduling timing relationship;

fig. 5 is a flowchart illustrating a method for data transmission in half-duplex FDD according to an embodiment of the present invention;

fig. 6 is a schematic diagram of downlink transmission of half-duplex FDD according to an embodiment of the present invention;

fig. 7 is a schematic diagram of downlink data scheduling of a base station in an embodiment of the present invention;

fig. 8 is a schematic diagram of uplink transmission of half-duplex FDD according to an embodiment of the present invention;

fig. 9 is a schematic diagram of half-duplex FDD uplink and downlink simultaneous transmission in an embodiment of the present invention;

fig. 10 is a schematic diagram of downlink data transmission for type B half-duplex FDD operation in an embodiment of the present invention;

fig. 11 is a schematic diagram of downlink data transmission of half-duplex FDD according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a data transmission apparatus in half-duplex FDD according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiment of the present invention, as shown in fig. 5, in uplink or downlink transmission of an LTE system, a detailed method flow of data transmission in half-duplex FDD is as follows:

step 501: determining configuration information of a radio frame, wherein the configuration information configures the number of uplink subframes and downlink subframes in the radio frame and the position information of the uplink subframes and the downlink subframes in the radio frame.

Preferably, the number of downlink subframes in the configuration radio frame in the configuration information is greater than or equal to 6.

More preferably, the configuration radio frame in the configuration information is composed of 6 downlink subframes and 4 uplink subframes; or the configuration wireless frame in the configuration information consists of 8 downlink subframes and 2 uplink subframes; or, the configuration radio frame in the configuration information is composed of 9 downlink subframes and 1 uplink subframe.

Preferably, the location information of the uplink subframe and the downlink subframe configured in the configuration information in the radio frame is determined according to a protocol agreement or according to a notification from the network side.

Preferably, the configuration information configures a downlink subframe, which is located before an uplink subframe and adjacent to the uplink subframe in the radio frame, as a guard subframe;

alternatively, the first and second electrodes may be,

and configuring a downlink subframe which is positioned in front of the uplink subframe and adjacent to the uplink subframe as a protected subframe and a downlink subframe which is positioned behind the uplink subframe and adjacent to the uplink subframe as a protected subframe in the configuration information.

Preferably, the manner of determining the configuration information of the radio frame includes, but is not limited to, the following:

firstly, determining configuration information of a wireless frame according to protocol convention;

secondly, determining configuration information of a wireless frame according to the notification message of the network side;

thirdly, determining the configuration information of the wireless frame according to the scheduling of the network side.

Preferably, it can be determined that each radio frame has the same configuration information; or, determining that part of the radio frames have the same configuration information. Specifically, the configuration information of each radio frame may be configured to be the same, or the same configuration information may be used to configure some radio frames, and some radio frames dynamically determine the uplink and downlink subframes according to the existing scheduling condition.

Step 502: and performing uplink and downlink data transmission according to the configuration information of the wireless frame.

In a preferred embodiment, if the configuration information configures a radio frame consisting of 6 downlink subframes and 4 uplink subframes, during uplink and downlink data transmission according to the configuration information of the radio frame, if transmission of a downlink data packet ends in an nth subframe of the radio frame, HARQ-ACK corresponding to the downlink data packet starts to be transmitted in an n +5 th subframe; and

In the preferred embodiment, if the (n + 5) th subframe is an unavailable subframe, the HARQ-ACK corresponding to the downlink data packet is transmitted in the first available subframe after the (n + 5) th subframe; and

if the m +5 th subframe is an unavailable subframe, transmitting uplink data corresponding to the uplink scheduling grant at a first available subframe after the m +5 th subframe; and

For uplink transmission, the unavailable subframe refers to a protected subframe, an unavailable uplink subframe configured by a network and a downlink subframe, and the available subframe refers to a subframe except the protected subframe, the unavailable uplink subframe configured by the network and the downlink subframe; for downlink transmission, an unavailable subframe refers to a protected subframe, an unavailable downlink subframe configured by the network, and an uplink subframe, and an available subframe refers to a subframe other than the protected subframe, the unavailable downlink subframe configured by the network, and the uplink subframe.

In a preferred embodiment, if the configuration radio frame in the configuration information is composed of 9 downlink subframes and 1 uplink subframe, in the process of performing uplink and downlink data transmission according to the configuration information of the radio frame, HARQ-ACKs corresponding to downlink data transmitted by a plurality of downlink subframes are carried in the uplink subframe in the radio frame.

Specifically, HARQ-ACKs corresponding to downlink data transmitted by a plurality of downlink subframes are carried in an uplink subframe by an ACK/NACK combining (bundling) or ACK/NACK multiplexing (multiplexing) manner.

In a preferred embodiment, if the configuration radio frame in the configuration information is composed of 8 downlink subframes and 2 uplink subframes, in the process of performing uplink and downlink data transmission according to the configuration information of the radio frame, HARQ-ACKs corresponding to downlink data transmitted by a plurality of downlink subframes are respectively carried in each uplink subframe in the radio frame.

Specifically, HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes is carried in an uplink subframe through an ACK/NACK combination or ACK/NACK multiplexing mode.

The following describes a data transmission process of half-duplex FDD in the LTE system according to three specific embodiments.

The first embodiment:

assume that the protocol agrees that the configuration information of the radio frame of half duplex FDD is: one radio frame includes 6 downlink subframes and 4 uplink subframes, and the uplink subframes are the 6 th, 7 th, 8 th and 9 th subframes in the radio frame.

For a UE operating in type a half-duplex FDD, assuming that the number of 10 subframes of a radio frame is 0-9, subframe 4 (i.e., the 5 th subframe) is reserved as a guard subframe for half-duplex FDD. For a UE operating in type B half-duplex FDD, subframe 4 (i.e., the 5 th subframe) and subframe 9 (i.e., the 10 th subframe) are reserved as protected subframes for half-duplex FDD. The UE does not perform downlink reception in the guard subframe for possible uplink and downlink switching.

In this embodiment, it is assumed that the configuration information in each radio frame is determined to be the same by the half-duplex FDD according to the protocol convention, that is: DDDDDUUUUD, where D denotes downlink and U denotes uplink.

Fig. 6 shows downlink transmission of half-duplex FDD, and fig. 6 only illustrates continuous scheduling of 5 HARQ processes, and actually, continuous scheduling of more HARQ processes may be adopted, where DGx denotes a downlink grant x, which is carried by an M-PDCCH, downlink data transmission corresponding to DGx is Dx, which is carried by a PDSCH, HARQ-ACK feedback corresponding to DGx is Ax, which is carried by a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

DGx and fixedly scheduling PDSCH of the second available downlink subframe after the subframe where the downlink subframe is located, wherein the available downlink subframe refers to downlink subframes except uplink subframes, guard subframes and network configured unavailable downlink subframes. It is assumed here that the network is not configured with unavailable downlink subframes. And the PDSCH transmission of the subframe n, and the corresponding HARQ-ACK feedback is transmitted in a subframe n + 5.

The base station may adopt more HARQ processes on the premise of not exceeding the maximum number of downlink HARQ processes supported by the UE, and as shown in fig. 7, a schematic diagram that the base station uses 8 HARQ processes to perform downlink data scheduling is given.

Because the configuration of the uplink and downlink subframes of the radio frame is determined, and the base station and the terminal have a consistent understanding on the second available downlink subframe after the M-PDCCH ends, the first two downlink subframes after the uplink subframe ends in the radio frame can also be used for downlink data transmission, so that the downlink peak rate can reach 400kbps, and here, the transmission of 4 HARQ processes at most can be supported in a 10ms period, and it is assumed that each subframe transmits at most one transport block with a maximum transport block size of 1000 bits.

Assuming that the configuration information of the radio frame for uplink transmission is the same as that of the radio frame for downlink transmission, the uplink transmission of half-duplex FDD is as shown in fig. 8. Wherein, the uplink grant is carried by the downlink physical channel M-PDCCH, and UGx indicates that the uplink grant x, the uplink data transmission corresponding to UGx is Ux, and is carried by the PUSCH. And the uplink authorization sent by the subframe m schedules PUSCH transmission of the subframe m +5, and the corresponding HARQ-ACK feedback is transmitted in the subframe m + 10.

In this specific embodiment, as shown in fig. 9, a schematic diagram of half-duplex FDD uplink and downlink simultaneous transmission is shown, where Ux + Ay refers to HARQ-ACK feedback Ay of downlink data Dy being carried in an uplink physical channel for transmitting uplink data Ux.

The second embodiment:

assume that the protocol agrees that the configuration information of the radio frame of half duplex FDD is: one radio frame includes 9 downlink subframes and 1 uplink subframe, and the uplink subframe is the 3 rd subframe in the radio frame.

For a UE operating in type a half-duplex FDD, it is assumed that 10 subframes of a radio frame are numbered 0-9, and subframe 1 (i.e., the 2 nd subframe) is reserved as a guard subframe for half-duplex FDD. For a UE operating in type B half-duplex FDD, subframe 1 (i.e., the 2 nd subframe) and subframe 3 (i.e., the 4 th subframe) are reserved as protected subframes for half-duplex FDD. The UE does not perform downlink reception in the guard subframe for possible uplink and downlink switching.

In this embodiment, it is assumed that the network can configure a part of the radio frames to adopt the above assumed configuration information, that is, the radio frames configured by the network are represented as: DDUDDDDD, in other wireless frames, the half-duplex FDD adopts the existing mechanism to determine the uplink and downlink directions of the subframes, namely, the uplink and downlink subframe configuration of the wireless frame is dynamically determined according to the network side scheduling.

Downlink data transmission for type B half-duplex FDD operation is shown in fig. 10, where DGx fixedly schedules PDSCH of the second available downlink subframe after the subframe where the available downlink subframe refers to downlink subframes other than guard subframes, network-configured unavailable downlink subframes, and uplink subframes, and it is assumed that the network is not configured with unavailable downlink subframes. And the uplink physical channel in the uplink subframe n bears HARQ-ACK feedback corresponding to at most 7 downlink data packets from the subframe n-13 to the subframe n-4. In this embodiment, it needs to be ensured that at least 3 subframes are spaced between downlink data transmission and corresponding HARQ-ACK feedback.

The uplink physical channel carrying multiple HARQ-ACKs adopts an ACK/NACK bundling mechanism, combines multiple HARQ-ACKs into one feedback information based on a predefined rule, and the feedback information has a length of 1 bit and is transmitted through a PUCCH format (format)1 a. Or, the uplink physical channel carrying multiple HARQ-ACKs adopts an ACK/NACKmultiplexing mechanism, and transmits multiple HARQ-ACK bits through PUCCH format (format) 3.

By adopting an ACK/NACK bundling or multiplexing mechanism, the number of subframes for downlink transmission is further increased, so that the peak downlink rate is further increased, which can reach 700kbps, and here, it is assumed that a maximum transport block with a maximum transport block size of 1000 bits is transmitted in each subframe, and the maximum transmission block can support transmission of 7 HARQ processes within a 10ms period at most.

The third embodiment:

and the half-duplex FDD UE dynamically determines the configuration information of the wireless frame according to the scheduling of the base station. Specifically, when the UE receives the downlink scheduling grant, the UE determines, from the radio frame receiving the downlink scheduling grant to each radio frame ending the radio frame carrying the corresponding HARQ-ACK feedback, that the uplink and downlink subframes in the radio frame are configured as: dduudddddddd. In the radio frame configured in this way, for a UE operating in type a half-duplex FDD, subframe 1 (i.e., the 2 nd subframe) is reserved as a protected subframe for half-duplex FDD; for a UE of type B half-duplex FDD operation, subframe 1 (i.e., the 2 nd subframe) and subframe 4 (i.e., the 5 th subframe) are reserved as half-duplex FDD protected subframes. The UE does not perform downlink reception in the guard subframe, and is configured to perform possible uplink and downlink switching.

In other wireless frames, configuring uplink and downlink subframes of a default wireless frame as: DDDDDUUUUD. In the radio frame configured in this way, for a UE of type a half-duplex FDD operation, subframe 4 (i.e., the 5 th subframe) is reserved as a half-duplex FDD protected subframe; for a UE operating in type B half-duplex FDD, subframe 4 (i.e., the 5 th subframe) and subframe 9 (i.e., 10 subframes) are reserved as half-duplex FDD protected subframes, and the UE does not perform downlink reception in the protected subframes for possible uplink and downlink switching.

Fig. 11 is a schematic diagram of downlink data transmission of half-duplex FDD, where DGx fixedly schedules PDSCH of a second available downlink subframe after the subframe where the available downlink subframe refers to a downlink subframe except for a guard subframe, an unavailable downlink subframe configured by the network, and an uplink subframe. The physical uplink channel in the uplink subframe n and the subframe n +1 carries HARQ-ACK feedback corresponding to all downlink subframes from the subframe n-12 to the subframe n-3, and in this embodiment, it needs to be ensured that at least 3 subframes are spaced between downlink data transmission and the corresponding HARQ-ACK feedback. Wherein, the uplink physical channel in the uplink subframe n carries at most 4 HARQ-ACK feedbacks between the subframe n-12 and the subframe n-5, and the uplink physical channel in the uplink subframe n +1 carries at most 2 HARQ-ACK feedbacks between the subframe n-4 and the subframe n-3. Or, the uplink physical channel in the uplink subframe n may carry 2 HARQ-ACK feedbacks at most, and the uplink physical channel in the uplink subframe n +1 may carry 4 HARQ-ACK feedbacks at most. Which HARQ-ACK feedback is taken depends on protocol conventions or network configuration.

And the multiple HARQ-ACK feedbacks adopt an ACK/NACK multiplexing mechanism, and multiple HARQ-ACK bits are subjected to channel selection transmission through PUCCH format 1 b.

By adopting an ACK/NACK multiplexing mechanism, the number of subframes for downlink transmission is further increased, so that the peak downlink rate is further increased, which can reach 600kbps, and here, it is assumed that a maximum transmission block with a maximum transmission block size of 1000 bits is transmitted in each subframe, and the maximum transmission block can support transmission of 6 HARQ processes within a 10ms period.

Based on the same inventive concept, the embodiment of the present invention provides a data transmission apparatus in half-duplex FDD, and the specific implementation of the apparatus may refer to the description of the above method embodiment, and repeated parts are not repeated, as shown in fig. 12, the apparatus mainly includes:

a processing module 1201, configured to determine configuration information of a radio frame, where the configuration information configures respective numbers of uplink subframes and downlink subframes in the radio frame and location information of the uplink subframes and the downlink subframes in the radio frame;

a transmission module 1202, configured to perform uplink and downlink data transmission according to the configuration information of the radio frame.

More preferably, the radio frame configured in the configuration information is composed of 6 downlink subframes and 4 uplink subframes; or, the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes; or, the radio frame configured in the configuration information is composed of 9 downlink subframes and 1 uplink subframe.

Preferably, the processing module is specifically configured to:

Preferably, the transmission module is specifically configured to:

if the transmission of a downlink data packet is finished in the nth subframe of the wireless frame, starting to transmit the HARQ-ACK corresponding to the downlink data packet in the (n + 5) th subframe; and

Preferably, the transmission module is specifically configured to:

if the wireless frame is configured in the configuration information and consists of 9 downlink subframes and 1 uplink subframe, carrying HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes in the uplink subframe in the wireless frame;

if the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes, respectively bearing HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes in each uplink subframe in the radio frame.

Based on the same inventive concept, an embodiment of the present invention further provides a device, which may be used for data transmission in half-duplex FDD, for example, the device is a terminal, and specific implementation of the device may refer to the description in the foregoing method embodiment, and repeated details are not described, as shown in fig. 13, the device mainly includes a processor 1301, a memory 1302, and a transceiver 1303, where the transceiver 1303 is configured to receive and transmit data under the control of the processor 1301, the memory 1302 stores a preset program, the processor 1301 is configured to read the program in the memory 1302, and execute the following processes according to the program:

In specific implementation, the processor determines configuration information of the wireless frame according to protocol agreement; or determining the configuration information of the wireless frame according to the notification message of the network side; or determining the configuration information of the wireless frame according to the scheduling of the network side.

In specific implementation, the processor determines that each wireless frame has the same configuration information; or, determining that part of the radio frames have the same configuration information.

Where the processors, memory and transceivers are connected by a bus, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by the processors and various circuits of the memory represented by the memory being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

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

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

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

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

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 data transmission method in half-duplex FDD is characterized by comprising the following steps:

performing uplink and downlink data transmission according to the configuration information of the wireless frame;

configuring a downlink subframe which is positioned in front of the uplink subframe and adjacent to the uplink subframe in the wireless frame as a protection subframe in the configuration information; or configuring a downlink subframe which is positioned in front of the uplink subframe and adjacent to the uplink subframe as a protection subframe and a downlink subframe which is positioned behind the uplink subframe and adjacent to the uplink subframe as a protection subframe in the configuration information;

the wireless frame configured in the configuration information consists of 6 downlink subframes and 4 uplink subframes; or, the radio frame configured in the configuration information is composed of 8 downlink subframes and 2 uplink subframes; or, the radio frame configured in the configuration information is composed of 9 downlink subframes and 1 uplink subframe.

2. The method of claim 1, wherein the location information of the uplink subframe and the downlink subframe configured in the configuration information in the radio frame is determined according to a protocol convention or according to a notification from a network side.

3. The method of claim 1 or 2, wherein the determining the configuration information of the radio frame comprises:

4. The method of claim 1 or 2, wherein the determining the configuration information of the radio frame comprises:

5. The method of claim 1, wherein if the radio frame configured in the configuration information consists of 6 downlink subframes and 4 uplink subframes, performing uplink and downlink data transmission according to the configuration information of the radio frame comprises:

6. The method of claim 5, wherein if the (n + 5) th subframe is an unavailable subframe, transmitting the HARQ-ACK corresponding to the downlink data packet in a first available subframe after the (n + 5) th subframe;

7. The method of claim 1, wherein if the radio frame configured in the configuration information consists of 9 downlink subframes and 1 uplink subframe, performing uplink and downlink data transmission according to the configuration information of the radio frame comprises:

8. The method of claim 1, wherein if the radio frame configured in the configuration information consists of 8 downlink subframes and 2 uplink subframes, performing uplink and downlink data transmission according to the configuration information of the radio frame comprises:

9. The method according to claim 7 or 8, wherein the carrying of hybrid automatic repeat request acknowledgement information HARQ-ACK corresponding to downlink data transmitted by a plurality of downlink subframes in the uplink subframe comprises:

10. A data transmission apparatus in half-duplex FDD, comprising:

the transmission module is used for transmitting uplink and downlink data according to the configuration information of the wireless frame;

11. The apparatus of claim 10, wherein the location information of the uplink subframe and the downlink subframe configured in the configuration information in the radio frame is determined according to a protocol convention or according to a notification from a network side.

12. The apparatus of claim 10 or 11, wherein the processing module is specifically configured to:

13. The apparatus of claim 10 or 11, wherein the processing module is specifically configured to:

14. The apparatus of claim 10, wherein the transmission module is specifically configured to:

15. The apparatus of claim 14, wherein the transmission module is specifically configured to:

16. The apparatus of claim 10, wherein the transmission module is specifically configured to: