WO2014086293A1

WO2014086293A1 - Data transmission method and device

Info

Publication number: WO2014086293A1
Application number: PCT/CN2013/088537
Authority: WO
Inventors: 林亚男
Original assignee: 电信科学技术研究院
Priority date: 2012-12-07
Filing date: 2013-12-04
Publication date: 2014-06-12
Also published as: CN103873183B; CN103873183A

Abstract

This application relates to the field of communications. Disclosed are a data transmission method and device. The method comprises: re-designing a data transmission manner, that is, when n=0 or 5, performing PDSCH scheduling transmission by using first M OFDM symbols in a sub-frame n+1 as downlink resources together with all OFDM symbols used for PDSCH transmission in a sub-frame n, and DLgrant and ULgrant being not transmitted in the sub-frame n+1. In this way, resources in a sub-frame 1 and a sub-frame 6 are fully utilized, which avoids waste of resources while effectively improving resource utilization.

Description

Data transmission method and device

The present application claims priority to Chinese Patent Application No. 201210526565.4, the entire disclosure of which is incorporated herein by reference. .

Technical field

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

In the LTE (Long Term Evolution) system, a radio frame has a length of 10 ms, and a radio frame contains 10 subframes, and one subframe has a length of 1 ms. For each TDD (Time Division Duplex) radio frame, seven TDD uplink/downlink subframe configurations are defined, as shown in Table 1; where D represents a DL (Downlink) subframe. U represents a UL (UpLink, Uplink) subframe, and S represents a special subframe of the TDD system.

The special subframe consists of three parts: "DwPTS ((downlink pilot slot))" area, "GP (Guard Period)" area and "UpPTS (uplink pilot slot)" area, where DwPTS It is used to transmit the downlink primary synchronization signal and the normal downlink service data, the GP is the protection interval, the UpPTS transmits the uplink random access signal and the uplink detection signal, and the special subframe has multiple configurations, as shown in Table 2.

When the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols occupied by the DwPTS in a special subframe is greater than 3, the special subframe can be regarded as a normal downlink subframe, and any downlink data service can be transmitted. When the DwPTS in a special subframe only occupies 3 OFDM symbols, only the downlink primary synchronization signal, the random access signal, and the uplink detection signal exist in the special subframe, that is, there is no downlink in the special subframe at this time. data transmission.

Table 1

(TDD uplink/downlink subframe configuration) Uplink and downlink configuration Subframe number

0 1 2 3 4 5 6 7 8 9

0 D S U U U D S U U U

1 D S U U D D S U U D

2 D S U D D D S U D D

3 D S U U U D D D D D

4 D S U U D D D D D D

5 D S U D D D D D D D

6 DSUUUDSUUD (The number of OFDM symbols included in the DwPTS area under various TDD configurations)

In the prior art, in the LTE system, if there are two different TDD operators in the adjacent frequency band, and different TDD operators configure different TDD uplink and downlink configurations in their respective frequency bands, the uplink and downlink may be caused. The cross interference between them is shown in Figure 1. Interference between the uplink and the downlink can seriously affect normal communication. To avoid this interference, a guard band needs to be reserved between the two working bands. The original agreement stipulated that no data transmission would take place within the guard band.

In order to make full use of the guard band between TDD operators, currently, subframe 0, subframe 1, subframe 2, subframe 5, and subframe 6 in the guard band can be used for data transmission. Regardless of which TDD configuration is used, subframe 0 and subframe 5 are always downlink subframes, subframe 2 is always an uplink subframe, and subframe 1 is always a special subframe, including: DwPTS (downlink pilot slot, used for downlink Transmission, length of at least 3 OFDM symbols), GP (Guard Interval) and UpPTS (uplink pilot time slot for uplink transmission, length of at least 1 OFDM symbol), at least the first 3 OFDM symbols in subframe 6 It is downlink. Therefore, there is no uplink-downlink interference in these subframes, as shown in Figure 2, that is, subframe 0 and subframe 5 are always downlink subframes, subframe 2 is always uplink subframe, subframe 1 and subframe. The first 3 OFDM symbols of 6 are used for downlink transmission, and the last OFDM symbol of subframe 1 is used as UpPTS.

On the other hand, in order to reduce the system overhead, a new carrier type is defined in LTE Rel-11, which is recorded as NCT (New Carrier Type), and the traditional PDCCH is not transmitted in the NCT carrier (Physical Downlink Control Channel) The physical downlink control channel may be an EPDCCH (Enhanced Physical Downlink Control Channel). The NCT carrier performs data demodulation based on URS (UE-specific reference signals), does not transmit CRS (Cell-specific reference signals), or occupies one subframe every 5 ms to transmit CRS and transmits only CRS of a port.

In summary, at present, resources available for downlink transmission in subframe 1 and subframe 6 are very limited. Therefore, in the actual application, the following problems will occur: In the LTE TDD Rel-8 system, when the DwPTS is 3 OFDM symbols, it is only used to transmit the PDCCH. The PDCCH transmitted is mainly used to carry the UL grant (uplink scheduling signaling), and is not used to transmit the PDSCH (Physical Downlink Shared). Channel, physical downlink shared channel). If the above method is still used in the guard band, the resources in the guard band cannot be fully utilized because there is only one uplink subframe (ie, subframe 2) in the guard band, and only the first three in subframe 1 and subframe 6. The OFDM symbol is used for downlink, the UL grant cannot be transmitted, and the PDSCH cannot be transmitted. Then most of the resources in subframe 1 and subframe 6 are completely wasted.

On the other hand, since the legacy PDCCH is not transmitted on the NCT carrier, when the special subframe configuration 0 and the special subframe configuration 5 are used, the DwPTS in the downlink subframe 1 and the downlink subframe 6 has no PDCCH. Transmission, or PDSCH transmission, will result in wasted resources. Application content

The embodiment of the present application provides a data transmission method and device for improving resource utilization in a frequency band.

The specific technical solutions provided by the embodiments of the present application are as follows:

A data transmission method includes:

Sending a DL grant to the UE, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where, n

= 0 or 5;

Transmitting a PDSCH to the UE in the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n based on the transmitted DL grant, where M is a positive integer not greater than N, N The maximum number of OFDM symbols in the downlink subframe.

A data transmission method in a frequency band, comprising:

Receiving a DL grant sent by the network side, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5;

Based on the received DL grant, the PDSCH is received on all OFDM symbols for PDSCH transmission and the first M OFDM symbols in subframe n+1 in the downlink subframe n, where M is a positive integer not greater than N, and N is a downlink The maximum number of OFDM symbols used for PDSCH transmission in a subframe.

A data transmission device includes:

a communication unit, configured to send a DL grant to the UE, where the DL grant is used to schedule PDSCH transmission in the downlink sub-frame n, where n = 0 or 5;

a processing unit, configured to transmit a PDSCH to the UE in the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n based on the transmitted DL grant, where M is not greater than N Positive integer, N is the maximum number of OFDM symbols in the downlink subframe. A data transmission device includes:

a communication unit, configured to receive a DL grant sent by the network side, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5;

a main control unit, configured to receive, according to the received DL grant, all PDSCHs for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n, where M is not greater than N A positive integer, N is the maximum number of OFDM symbols used for PDSCH transmission in the downlink subframe.

In the embodiment of the present application, a data transmission mode is redesigned, that is, when n=0 or 5, the first M OFDM symbols in the subframe n+1 are used as the downlink resource and all the subframes n are used for the PDSCH transmission. The OFDM symbols are used for PDSCH scheduling transmission together, wherein the DL grant and the UL grant are not transmitted in the subframe n+1, so that the resources in the subframe 1 and the subframe 6 can be fully utilized, and the resource waste is effectively avoided. Resource utilization. DRAWINGS

FIG. 1 is a schematic diagram of interference between TDD uplink and downlink in the background art;

2 is a schematic diagram of a subframe configuration in a guard band under the background art;

FIG. 3 is a flowchart of data transmission performed by a base station according to an embodiment of the present application;

4 is a schematic diagram of data scheduling by using a PDCCH in an embodiment of the present application;

FIG. 5 is a schematic diagram of resource scheduling by using an EPDCCH in the embodiment of the present application;

FIG. 6 is a flowchart of data transmission performed by a UE according to an embodiment of the present application;

7 is a schematic structural diagram of a first base station in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a first UE function according to an embodiment of the present application;

9 is a schematic structural diagram of a function of a second base station in the embodiment of the present application;

FIG. 10 is a schematic structural diagram of a function of a second UE in the embodiment of the present application. detailed description

In order to improve the resource utilization in the frequency band, a new data transmission method is designed in the embodiment of the present application, and the resources in the downlink subframe 1 and the downlink subframe 6 can be fully utilized.

The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, in the embodiment of the present application, the specific process of data transmission by the base station is as follows:

Step 300: The base station sends a DL grant to the UE, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5.

In the embodiment of the present application, the DL grant sent by the base station passes the PDCCH (Physical Downlink Control) Channel, physical downlink control channel) transmission, as shown in FIG. 4; or, through EPDCCH (Enhanced Physical Downlink Control Channel), as shown in FIG. 5; or, in downlink subframe n; or The downlink subframe in the downlink subframe n is transmitted in the downlink subframe.

Step 310: The base station transmits the PDSCH to the UE in the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n based on the transmitted DL grant, where M is not greater than N. A positive integer, N is the maximum number of OFDM symbols in the downlink subframe.

In the embodiment of the present application, since n = 0 or 5, the subframe n is a downlink subframe n, and the subframe n+1 may be a special subframe or a downlink subframe, and thus are respectively referred to as a downlink subframe. Frame n and subframe n+l.

In step 310, the base station transmits the PDSCH to the UE using the same frequency band on the downlink subframe n and the subframe n+1. In the foregoing embodiment, the base station may transmit the PDSCH to the UE by using, but not limited to, the following two manners.

The first mode is: the base station encodes a TB (Transport Block) to obtain coding information, and maps the coding information to all OFDM symbols used for PDSCH transmission and the former M in subframe n+1 in the downlink subframe n. Transmission is performed on the OFDM symbols, that is, the PDSCH is transmitted to the UE through the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n in the joint coding manner.

In this case, the UE determines, according to the N _PRB , the TB size corresponding to the current PDSCH transmission, and the TB is mapped to all the OFDM symbols used for PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n. Transmission, where N _raB =L _RB x ”, 1<A<2, A is pre-agreed by the standard or pre-configured by the network side, preferably

A=1.4 ( 17/12 ), the PRB occupied by the current PDSCH transmission indicated in the DL grant sent by the base station

(Physical Resource Block, number of physical resource blocks).

Specifically, the UE may determine, according to the modulation and coding level information/ _MCS used by the current PDSCH allocated by the network side indicated in the UL grant, the modulation level and the TBS (Transport Block Size) index used for transmitting the PDSCH. / _TBS , according to / _TBS and N _PRB further lookup table to know the number of data source bits of the currently scheduled PDSCH. In the following embodiments, the size of the transport block is determined in this manner, and will not be described again.

On the other hand, in order to be able to grasp the data transmission situation on the PDSCH in time, the base station needs to receive the ACK/NAK (ACKnowledge/ Negative ACKnowledge) information fed back by the UE, preferably, but not limited to the following Any of three ways:

Mode A-1: The uplink subframe 2 of the base station in the radio frame m+1 receives the ACK/NAK information corresponding to the PDSCH transmission in the radio frame m fed back by the UE.

Mode A-2: If the first type of carrier that currently carries the PDSCH transmission (that is, the carrier that does not transmit the DL grant and the UL grant on the subframe n+1 (ie, subframe 1 and subframe 6)] is used as a secondary carrier and other Class 2 carrier (ie, can be in a subframe) n+1 (ie, subframe 1 and subframe 6) transmits the carrier of the DL grant and the UL grant], and the base station receives the ACK/NAK information corresponding to the PDSCH transmission in the first type of carrier fed back by the UE on the second type of carrier. And the base station receives, on the uplink subframe n+1+k, all the OFDM symbols used for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n of the first type of carriers fed back by the UE. The ACK/NAK information corresponding to the PDSCH, where the uplink subframe n+1+k is an uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1 in the second type carrier, and k is a preset parameter. The correspondence between n and k is as shown in Table 3.

table 3

( K: {H-U for TDD)

Mode A-3: The base station receives, in the uplink subframe n+1+k, all the OFDM symbols used for the PDSCH transmission and the PDSCH corresponding to the transmission on the first M OFDM symbols in the subframe n+1 in the downlink subframe n fed back by the UE. ACK/NAK information, where the uplink subframe n+1+k is an uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1 of the carrier currently carrying the PDSCH transmission, k is a preset parameter, k and n The correspondence between them is also shown in Table 3.

The second mode is: the base station obtains the first coding information after encoding the first TB, and maps the first coding information to all OFDM symbols used for PDSCH transmission in the downlink subframe n, and obtains the second TB code. Second coding information, and mapping the second coding information to the first M OFDM symbols in the subframe n+1, that is, using the OFDM symbol and the subframe n for the PDSCH transmission in the downlink subframe n in an independent coding manner. The first M OFDM symbols in +1 transmit the PDSCH to the UE.

In other words, the data is divided into two parts P1 and P2, wherein P1 is independently coded and then mapped to sub-frame n for transmission, and P2 is independently coded and mapped to sub-frame n+1 for transmission.

In this case, the UE may be based on _∞ ( _∞ is the current indicated in the DL grant sent by the base station)

The number of PRBs occupied by the PDSCH transmission is determined by the first TB size corresponding to the PDSCH transmission in the downlink subframe n (that is, the P1 size), and the first TB is mapped to all the OFDM symbol uploads for the PDSCH transmission in the downlink subframe n. And; according to ^, determine the number of PRBs actually used in the sub-frame η+1, N _PHS , „ ₊₁ , N _{PRB n+l} = [N^ x ^ 'J , where 0<Α'<1 , Α ' Standard pre-agreed or pre-configured by the network side, preferably A=0.25 ( « 3/12 ), the UE maps to the pre-frame n+1 according to the second TB size (ie P2 size). M OFDM symbols are transmitted.

On the other hand, in order to be able to grasp the data transmission situation on the PDSCH in time, the base station needs to receive feedback from the UE.

The ACK/NAK information, preferably, may be, but is not limited to, any one of the following three methods:

Method B-1: The base station in the uplink subframe 2 of the radio frame m+1 receives the ACK/NAK information corresponding to the PDSCH transmission in the radio frame m fed back by the UE.

Method B-2: If the first type of carrier that currently carries the PDSCH transmission (that is, the carrier that does not transmit the DL grant and the UL grant on the subframe n+1 (ie, subframe 1 and subframe 6)] is used as the secondary carrier and the second type. The carrier (that is, the carrier of the DL grant and the UL grant may be transmitted in the subframe n+1 (ie, subframe 1 and subframe 6)], and the base station receives the PDSCH in the first type of carrier fed back by the UE on the second type of carrier. Transmitting the corresponding ACK/NAK information, the base station will receive the first TB corresponding to the OFDM symbol transmitted on the OFDM symbol for the PDSCH transmission in the downlink sub-frame n of the first type of carrier, which is received by the UE on the uplink subframe n+k. ACK/NAK information, on the uplink subframe n+1+k', the ACK corresponding to the second TB transmitted on the first M OFDM symbols in the downlink subframe n+1 of the first type of carrier is received. /NAK information, where the uplink subframe n+k is an uplink subframe of the transmission ACK/NAK information corresponding to the downlink subframe n in the primary carrier, and the uplink subframe n+1+k' is the downlink subframe in the primary carrier The uplink subframe corresponding to the transmission ACK/NAK information corresponding to n+1, k and k' are preset parameters. The correspondence between it and k' is as shown in Table 3.

Method B-3: The base station will receive, on the uplink subframe n+k, the ACK/NAK information corresponding to the first TB transmitted by the UE to all the OFDM symbols used for PDSCH transmission in the downlink subframe n, in the uplink subframe The ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in the downlink subframe n+1 in the first type of carrier is received on the frame n+1+k', where the uplink subframe is received. The n+k is the uplink subframe of the ACK/NAK information corresponding to the downlink subframe n in the carrier that carries the PDSCH transmission, and the uplink subframe n+1+k' is the downlink subframe n+1 of the carrier that is currently carrying the PDSCH transmission. The corresponding uplink subframe for transmitting ACK/NAK information, k and k' are preset parameters, and the correspondence between n and k, k' is as shown in Table 3.

Based on the description in the foregoing embodiment, the UE does not receive the DL grant and the UL grant that are sent by the base station in the subframe 1 and the subframe 6. Then, in the embodiment of the present application, the base station may adopt the DL grant and the UL grant. However, it is not limited to the following methods to issue a UL grant:

In the first case, the base station transmits the UL grant corresponding to the PUSCH transmission in the uplink subframe 2 in the radio frame m and the downlink sub-frame in the radio frame m+1 in the downlink subframe 5 in the radio frame m-1. In the frame 1, the ACK/NAK information corresponding to the PUSCH transmission in the uplink subframe 2 in the radio frame m is transmitted. In the second case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 0, the base station transmits the PUSCH transmission in the uplink subframe 7 and the uplink subframe 8 in the radio frame m in the downlink subframe 0 in the radio frame m. Corresponding UL grant; The UL grant corresponding to the PUSCH transmission in the uplink subframe 2 and the uplink subframe 3 in the radio frame m is transmitted in the downlink subframe 5 in the radio frame m-1.

In addition, the other uplink subframes send the UL grant according to the existing scheduling timing relationship, and the specific parameter table 4 shows that the PUSCH transmission in each uplink subframe receives the ACK/NAK information fed back by the UE according to the existing feedback timing. 5 is shown.

Table 4

table 5

In the third case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 1, the base station transmits the UL grant corresponding to the PUSCH transmission in the uplink subframe 7 in the radio frame m in the downlink subframe 0 in the radio frame m; The UL grant corresponding to the PUSCH transmission in the uplink subframe 2 in the radio frame m is transmitted in the downlink subframe 5 in the radio frame m-1.

In the fourth case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the base station transmits the UL grant corresponding to the PUSCH transmission in the uplink subframe 8 in the radio frame m in the downlink subframe 0 in the radio frame m; The UL grant corresponding to the PUSCH transmission in the uplink subframe 3 in the radio frame m is transmitted in the downlink subframe 5 in the radio frame m-1. In addition, the other uplink subframes send the UL grant according to the existing scheduling timing relationship, and the specific parameter table 4 shows that the PUSCH transmission in each uplink subframe receives the ACK/NAK information fed back by the UE according to the existing feedback timing. 5 is shown.

When the UL grant is transmitted according to the timing relationship described in the above four cases, multi-subframe scheduling is required (that is, the UL grant corresponding to multiple uplink subframes is transmitted in the same downlink subframe). In this case, the UL grant needs to add subframes. The indication information is used to indicate which uplink subframe or subframes the current UL grant specifically schedules.

Corresponding to the above embodiment, referring to FIG. 6, in the embodiment of the present application, the specific process for the UE to perform data transmission in the frequency band is as follows:

Step 600: The UE receives the DL grant sent by the network side, and the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5.

In the embodiment of the present application, the UE receives the DL grant sent by the base station by using the PDCCH, as shown in FIG. 4, or receives the DL grant sent by the base station by using the EPDCCH, as shown in FIG. 5; or, in the downlink subframe n. Receiving the DL grant sent by the base station; or receiving the DL grant sent by the base station in the downlink subframe before the downlink subframe n.

Step 610: The UE receives the PDSCH in the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n based on the received DL grant, where M is a positive integer not greater than N. N is the maximum number of OFDM symbols in the downlink subframe.

Similarly to step 310, since n = 0 or 5, subframe n is a downlink subframe n, and subframe n+1 may be a special subframe or a downlink subframe, and thus is referred to as a downlink subframe. Frame n and subframe n+1.

In step 610, the UE receives the PDSCH using the same frequency band on the downlink subframe n and the subframe n+1.

In the embodiment of the present application, since the base station can transmit the PDSCH in two manners, the corresponding UE can determine the TB size in the PDSCH transmission by using, but not limited to, the following two manners.

The first mode is: the UE determines, according to N^, the TB size corresponding to the current PDSCH transmission, where the TB is mapped to all the OFDM symbols used for PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n. transmission,

1<A<2, A is pre-agreed by the standard or pre-configured by the network side, preferably A=1.4 (.17/12), where N is the number of PRBs occupied by the current PDSCH transmission indicated in the DL grant sent by the base station.

On the other hand, in order to enable the network side to timely grasp the data transmission situation on the PDSCH, the UE feeds back the ACK/NAK to the base station, which may be, but is not limited to, any one of the following three methods:

Mode C-1: The UE transmits an ACK/NAK information corresponding to the PDSCH transmission in the radio frame m to the base station in the uplink subframe 2 of the radio frame m+1.

Mode C-2: If the first type of carrier that currently carries the PDSCH transmission (ie, in subframe n+1 (ie, subframe 1 and subframe 6) A carrier that does not transmit DL grant and UL grant] acts as a secondary carrier and other second type of carriers (ie, carriers that can transmit DL grant and UL grant in subframes n+1 (ie, subframe 1 and subframe 6)] And the UE feeds back the ACK/NAK information corresponding to the PDSCH transmission in the first type of carrier on the second type of carrier, and the UE feeds back the first type of intra-carrier downlink sub-frame n to the base station in the uplink subframe n+1+k. ACK/NAK information corresponding to the PDSCH transmitted on the first M OFDM symbols in the OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1, wherein the uplink subframe n+1+k is the subframe in the second type carrier The uplink subframe corresponding to the transmission ACK/NAK information corresponding to n+1, k is a preset parameter. The correspondence between n and k is as shown in Table 3.

Mode C-3: The UE feeds back, to the base station, all the OFDM symbols used for PDSCH transmission in the downlink subframe n and the PDSCH transmitted on the first M OFDM symbols in the subframe n+1 in the uplink subframe n+1+k. ACK/NAK information, where the uplink subframe n+1+k is an uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1 of the carrier currently carrying the PDSCH transmission, where k is a preset parameter, k and n The correspondence between the two is also shown in Table 3.

The second way: UE may determine a first TB size downlink subframe n in accordance with the corresponding PDSCH transmission (the current number of PDSCH transmissions PRB _∞ is indicated in the DL grant from the base station occupied) _∞ (i.e. P1 Size), the first TB is mapped to all OFDM symbols used for PDSCH transmission in the downlink subframe n; and the number of PRBs actually used in the subframe n+1 is determined according to ^N _PRS , „ ₊₁ , N _{PRB n+ ]} = [N^ x ^ 'J , where 0<Α'<1 , Α' is pre-agreed by the standard or pre-configured by the network side, preferably A=0.25 (^ 3/12 ), UE according to _ρΛΒ „ _{+ 1} Determine a second TB size (i.e., P2 size) that is mapped onto the first M OFDM symbols in subframe n+1 for transmission.

On the other hand, in order to be able to timely grasp the data transmission on the PDSCH, the UE needs to feed back ACK/NAK information to the network side. Preferably, the UE may use one of the following three methods:

Method D-1: The UE forwards the ACK/NAK information corresponding to the PDSCH transmission in the radio frame m to the base station in the uplink subframe 2 in the radio frame m+1.

Method D-2: If the first type of carrier that currently carries the PDSCH transmission (that is, the carrier that does not transmit the DL grant and the UL grant on the subframe n+1 (ie, subframe 1 and subframe 6)] is used as the secondary carrier and the second type. The carrier (that is, the carrier of the DL grant and the UL grant may be transmitted in the subframe n+1 (ie, the subframe 1 and the subframe 6)], and the UE feeds back the PDSCH transmission in the first type of carrier on the second type of carrier. ACK/NAK information, the UE will feed back the ACK/NAK corresponding to the first TB transmitted on all OFDM symbols for PDSCH transmission in the downlink subframe n of the first type of carrier to the base station on the uplink subframe n+k. The ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in the downlink subframe n+1 of the first type of carrier is fed back to the base station, where The uplink subframe n+k is an uplink subframe of the transmission ACK/NAK information corresponding to the downlink subframe n in the primary carrier, and the uplink subframe n+l+k' is an uplink subframe for transmitting ACK/NAK information corresponding to the downlink subframe n+1 in the second type carrier, and k and k' are preset parameters, and the correspondence between 0 and k' is specific as shown in Table 3

Method D-3: The UE feeds back, on the uplink subframe n+k, ACK/NAK information corresponding to the first TB transmitted on all OFDM symbols used for PDSCH transmission in the downlink subframe n, in the uplink subframe n. The +1+k' is forwarded to the base station and is mapped to the ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in the downlink subframe n+1, where the uplink subframe n+k is the current bearer PDSCH transmission. The uplink subframe of the ACK/NAK information corresponding to the downlink subframe n in the carrier, and the uplink subframe n+1+k' is the transmission ACK/NAK information corresponding to the downlink subframe n+1 of the carrier currently carrying the PDSCH transmission. The uplink subframe, k and k' are preset parameters, and the correspondence between n and k, k' is as shown in Table 3.

Based on the description in the foregoing embodiment, the UE does not receive the DL grant and the DL grant sent by the base station side in the subframe 1 and the subframe 6.

The UL grant, then, in order to enable the PUSCH transmission to be correctly scheduled, in the embodiment of the present application, the UE may receive the UL grant by using, but not limited to, the following method:

In the first case, the UE receives the intra-radio frame m in the uplink subframe 2 in the downlink subframe 5 in the radio frame m-1.

The UL grant corresponding to the PUSCH transmission; and the ACK/NAK information corresponding to the PUSCH transmission in the uplink subframe 2 in the radio frame m in the downlink subframe 1 in the radio frame m+1.

In the second case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 0, the UE receives the PUSCH transmission in the uplink subframe Ί and the uplink subframe 8 in the radio frame m in the downlink subframe 0 in the radio frame m. Corresponding UL grant; receiving the intraframe 2 and the uplink subframe 3 in the radio frame m in the downlink subframe 5 in the radio frame m-1

The PUSCH transmits the corresponding UL grant.

In addition, the other uplink subframes receive the UL grant according to the existing scheduling timing relationship, and the specific parameter table 4 shows that the PUSCH transmission in each uplink subframe feeds back ACK/NAK information to the base station according to the existing feedback timing. Shown.

In the third case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 1, the UE receives the UL grant corresponding to the PUSCH transmission in the uplink subframe 7 in the radio frame m in the downlink subframe 0 of the radio frame m; The UL grant corresponding to the PUSCH transmission in the uplink subframe 2 in the radio frame m is received in the downlink subframe 5 in the radio frame m-1.

In the fourth case, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the UE receives the UL grant corresponding to the PUSCH transmission in the uplink subframe 8 in the radio frame m in the downlink subframe 0 of the radio frame m; The UL grant corresponding to the PUSCH transmission in the uplink subframe 3 in the radio frame m is received in the downlink subframe 5 in the radio frame m-1. In addition, the other uplink subframes receive the UL grant according to the existing scheduling timing relationship, and the specific parameter table 4 shows that the PUSCH transmission in each uplink subframe feeds back ACK/NAK information to the base station according to the existing feedback timing. Shown.

When the UL grant is received according to the timing relationship described in the above four cases, multi-subframe scheduling (that is, the UL grant corresponding to multiple uplink subframes is transmitted in the same downlink subframe) is required. In this case, the UE needs to be added according to the UL grant. The subframe indication information distinguishes which one or which uplink subframes the current UL grant specifically schedules.

Based on the foregoing embodiment, referring to FIG. 7, in the embodiment of the present application, the base station includes a communication unit 70 and a processing unit 71, where

The communication unit 70 is configured to send a DL grant to the UE, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5;

The processing unit 71 is configured to transmit, according to the transmitted DL grant, the PDSCH to the UE in all the OFDM symbols for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 in the downlink subframe n, where M is not greater than A positive integer of N, where N is the maximum number of OFDM symbols in the downlink subframe.

The communication unit 70 transmits the DL grant through the PDCCH; or transmits the DL grant through the EPDCCH; or transmits the DL grant in the downlink subframe n; or, the DL grant is in the downlink subframe n The previous downlink subframe is transmitted.

The processing unit 71 transmits the PDSCH to the UE through the same frequency band on the downlink subframe n and the subframe n+1.

The processing unit 71 obtains coding information by encoding one TB, and maps the coding information to all OFDM symbols used for PDSCH transmission in the downlink subframe n and the first M OFDM symbols in the subframe n+1 for transmission; or Encoding the first TB to obtain the first coding information, and mapping the first coding information to all OFDM symbols used for PDSCH transmission in the downlink subframe n for transmission; and encoding the second TB to obtain the second coding information, The second coding information is mapped to the first M OFDM symbols in the subframe n+1 for transmission.

The communication unit 70 is further configured to:

The uplink subframe 2 in the radio frame m+1 receives the correct response command/error response command ACK/NAK information corresponding to the PDSCH transmission in the radio frame m fed back by the UE; or

Receiving, in the uplink subframe n+1+k, the ACK corresponding to the PDSCH transmitted on the first M OFDM symbols in the OFDM symbol for the PDSCH transmission and the subframe M+1 in the downlink subframe n fed back by the UE. The NAK information, where the uplink subframe n+1+k is an uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1, where k is a preset parameter; or

Receiving, in the uplink subframe n+k, the mapping fed back by the UE to all the downlink subframe n in the downlink subframe n for PDSCH transmission

ACK/NAK information corresponding to the first TB transmitted on the OFDM symbol, where the uplink subframe n+k is the downlink subframe n Corresponding uplink subframe for transmitting ACK/NAK information, k is a preset parameter; and the uplink M subframe receives the mapping of the UE feedback to the pre-M in the subframe n+1 on the uplink subframe n+1+k′ The ACK/NAK information corresponding to the second TB transmitted on the OFDM symbols, where the uplink subframe n+ 1 + k' is the uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1, and k' is a preset parameter.

The communication unit 70 is further configured to:

The uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m is transmitted in the downlink subframe 5 in the radio frame m-1, and in the downlink subframe 1 in the radio frame m+1. Transmitting ACK/NAK information corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m;

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 0, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 and the uplink subframe 8 in the radio frame m is transmitted in the downlink subframe 0 in the radio frame m, in the wireless The downlink grant 5 in the frame m-1 transmits the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 and the uplink subframe 3 in the radio frame m; or

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 1, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 in the radio frame m is transmitted in the downlink subframe 0 of the radio frame m, and is in the radio frame m-1. In the downlink subframe 5, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m is transmitted; or

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 8 in the radio frame m is transmitted in the downlink subframe 0 of the radio frame m, and is in the radio frame m-1. In the downlink subframe 5, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 3 in the radio frame m is transmitted.

Referring to FIG. 8, in the embodiment of the present application, the UE includes a communication unit 80 and a main control unit 81, where the communication unit 80 is configured to receive a DL grant sent by the network side, where the DL grant is used to schedule the downlink subframe n. of

PDSCH transmission, where n = 0 or 5;

The main control unit 81 is configured to receive, according to the received DL grant, all PDSCHs for the PDSCH transmission and the first M OFDM symbols of the subframe n+1 in the downlink subframe n, where M is not greater than N A positive integer, N is the maximum number of OFDM symbols used for PDSCH transmission in the downlink subframe.

The communication unit 80 receives the DL grant through the PDCCH; or

Receiving the DL grant by using the EPDCCH; or receiving the DL grant in the downlink subframe n; or receiving the DL grant in a downlink subframe before the downlink subframe n.

The main control unit 81 receives the PDSCH through the same frequency band on the downlink subframe n and the subframe n+1.

The main control unit 81 determines the number N′ of resource blocks occupied by the current PDSCH transmission based on the received DL grant, and determines the size of the TB according to the N _B , and the TB is mapped to all OFDM for the PDSCH transmission in the downlink subframe n. The symbol and the transmission of the first M OFDM symbols in the subframe n+1, where N _PJ3⁄4 = L _RB x^4", 1 < A < 2, pre-agreed by the standard or pre-configured by the network side; or, based on the received DL The grant determines the number N of resource blocks occupied by the current PDSCH transmission, and determines the first TB size according to _∞ , the first TB is mapped to all OFDM symbols used for PDSCH transmission in the downlink subframe n; and according to Λ^^+, Determining the size of the second frame, the second frame is mapped to the subframe n+1

A' is pre-agreed by the standard or pre-configured by the network side.

The communication unit 80 is further used to:

The uplink subframe 2 in the radio frame m+1 feeds back to the network side the correct answer command/error response command ACK/NAK information corresponding to all PDSCHs in the radio frame m; or

All the signals in the downlink subframe n for PDSCH transmission are fed back to the network side on the uplink subframe n+1+k.

ACK/NAK information corresponding to the PDSCH transmitted on the first M OFDM symbols of the OFDM symbol and the downlink subframe n+1, where the uplink subframe n+1+k is the transmission ACK/NAK information corresponding to the subframe n+1 In the uplink subframe, k is a preset parameter; or

The ACK/NAK information corresponding to the first TB transmitted on all OFDM symbols used for PDSCH transmission in the downlink subframe n is fed back to the network side on the uplink subframe n+k, where the uplink subframe n+k For the uplink subframe of the ACK/NAK information corresponding to the downlink subframe n, k is a preset parameter; and the uplink subframe is fed back to the network side to the subframe n+ on the uplink subframe n+1+k' 1 ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols, where the uplink subframe n+ 1 + k′ is the uplink subframe of the transmission ACK/NAK information corresponding to the downlink subframe n+ 1 , k′ Preset parameters.

The communication unit 80 is further used to:

Receiving, in the downlink subframe 5 in the radio frame m-1, the uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m, and in the downlink subframe 1 in the radio frame m+1 Receiving ACK/NAK information corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m; or

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 0, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 and the uplink subframe 8 in the radio frame m is received in the downlink subframe 0 in the radio frame m, in the wireless The downlink grant 5 in the frame m-1 receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 and the uplink subframe 3 in the radio frame m; or

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 1, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 in the radio frame m is received in the downlink subframe 0 in the radio frame m, and is in the radio frame m-1. The downlink sub-frame 5 receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m; or If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 8 in the radio frame m is received in the downlink subframe 0 in the radio frame m, and is in the radio frame m-1. The downlink subframe 5 receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 3 in the radio frame m.

As shown in FIG. 9, the second base station in this embodiment of the present application includes:

The processor 900 is configured to send, by using the transceiver 910, a DL grant to the UE, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5; based on the transmitted DL grant, in the downlink subframe n The OFDM symbol for the PDSCH transmission and the first M OFDM symbols in the subframe n+1 are transmitted by the transceiver 910 to the UE, where M is a positive integer not greater than N, and N is an OFDM symbol in the downlink subframe. The maximum number; the transceiver 910 is configured to send and receive data under the control of the processor 900.

The processor 900 is specifically configured to: transmit the DL grant by using a PDCCH; or transmit the DL grant by using an EPDCCH; or transmit the DL grant in a downlink subframe n; or The downlink subframe in the downlink subframe n is transmitted in the downlink subframe.

The processor 900 is specifically configured to: control the transceiver 910 to transmit the PDSCH to the UE through the same frequency band on the downlink subframe n and the subframe n+1.

The processor 900 is specifically configured to: control the transceiver 910 to encode one TB to obtain coding information, and map the coding information to all OFDM symbols used for PDSCH transmission and the first M OFDM in subframe n+1 in the downlink subframe n. Transmission is performed on the symbol; or, the control transceiver 910 encodes the first TB to obtain the first coding information, and maps the first coding information to all OFDM symbols used for PDSCH transmission in the downlink subframe n for transmission; The second TB is encoded to obtain second encoding information, and the second encoding information is mapped to the first M OFDM symbols in the subframe n+1 for transmission.

The processor 900 is specifically configured to: control the transceiver 910 to receive the correct response command/error response command ACK/NAK information corresponding to the PDSCH transmission in the radio frame m fed back by the UE in the uplink subframe 2 in the radio frame m+1; or The control transceiver 910 receives, on the uplink subframe n+1+k, all the OFDM symbols for the PDSCH transmission and the PDSCH transmitted on the first M OFDM symbols in the subframe n+1 in the downlink subframe n fed back by the UE. Corresponding ACK/NAK information, where the uplink subframe n+1+k is an uplink subframe of the transmission ACK/NAK information corresponding to the subframe n+1, and k is a preset parameter; or

The control transceiver 910 receives, on the uplink subframe n+k, the ACK/NAK information corresponding to the first TB transmitted on the OFDM symbol for the PDSCH transmission in the downlink subframe n, which is fed back by the UE, where the uplink subframe The frame n+k is an uplink subframe for transmitting ACK/NAK information corresponding to the downlink subframe n, where k is a preset parameter; and the uplink subframe receives the mapping of the UE feedback on the uplink subframe n+1+k′ to ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in the subframe n+1, where the uplink subframe n+1+k' is the transmission ACK/NAK signal corresponding to the subframe n+1 The uplink subframe of the interest, k' is the preset parameter.

The processor 900 is specifically configured to: control, by the transceiver 910, the uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m in the downlink subframe 5 in the radio frame m-1, and in the wireless The downlink subframe 1 in the frame m+1 transmits the ACK/NAK information corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m. If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 0, the transceiver 910 is controlled. Transmitting, in the downlink subframe 0 of the radio frame m, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 and the uplink subframe 8 in the radio frame m, and transmitting the radio frame in the downlink subframe 5 in the radio frame m-1 a UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 and the uplink subframe 3; or

If the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 1, the control transceiver 910 transmits the UL grant corresponding to the PUSCH transmitted in the uplink subframe 无线 in the radio frame m in the downlink subframe 0 of the radio frame m, in the radio frame. The downlink subframe 5 in the m-1 transmits the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m; or if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the transceiver 910 is controlled to be wireless. The UL grant corresponding to the PUSCH transmitted in the uplink subframe 8 in the radio frame m is transmitted in the downlink subframe 0 in the frame m, and is transmitted in the uplink subframe 3 in the radio frame m in the downlink subframe 5 in the radio frame m-1. The UL grant corresponding to the transmitted PUSCH.

Here, in FIG. 9, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 900 and various circuits of memory represented by memory 920. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 910 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 can store data used by the processor 900 in performing operations.

The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 can store data used by the processor 900 in performing operations.

As shown in FIG. 10, the second UE in this embodiment of the present application includes:

The processor 1000 is configured to receive, by using the transceiver 1010, a DL grant sent by the network side, where the DL grant is used to schedule PDSCH transmission in the downlink subframe n, where n = 0 or 5; based on the received DL grant, in the downlink subroutine All of the OFDM symbols for the PDSCH transmission and the first M OFDM symbols of the subframe n+1 in the frame n receive the PDSCH through the transceiver 1010, where M is a positive integer not greater than N, and N is used in the downlink subframe The maximum number of OFDM symbols transmitted by the PDSCH;

The transceiver 1010 is configured to send and receive data under the control of the processor 1000.

The processor 1000 is specifically configured to: control the transceiver 1010 to receive the DL grant by using a PDCCH; or Receiving the DL grant by using the EPDCCH; or receiving the DL grant in the downlink subframe n; or receiving the DL grant in a downlink subframe before the downlink subframe n.

The processor 1000 is specifically configured to: control the transceiver 1010 to receive the PDSCH through the same frequency band on the downlink subframe n and the subframe n+1.

The processor 1000 is specifically configured to: determine, according to the received DL grant, the number of resource blocks occupied by the current PDSCH transmission.

N _M , and determining the size of the TB according to N^, the TB is mapped to all OFDM symbols used for PDSCH transmission and the first M OFDM symbols in subframe n+1 in the downlink subframe n, where N _PRB = [ N _P ' _RB x ′′, 1<Α<2, pre-agreed by the standard or pre-configured by the network side; or, based on the received DL grant, the number of resource blocks N′ occupied by the current PDSCH transmission is determined, and the first TB is determined according to N′ a size, the first TB is mapped to all OFDM symbols used for PDSCH transmission in the downlink subframe n; and the size of the second TB is determined according to the N _{PRB RM} , where the second TB is mapped to the subframe n+1 Transmission on the first M OFDM symbols, where N _{PRB N+} = N^ x ^ 'J ,

0<Α'<1 , Α' is pre-agreed by the standard or pre-configured by the network side.

The processor 1000 is specifically configured to: control the transceiver 1010 to feed back the correct response command/error response command ACK/NAK information corresponding to all PDSCHs in the radio frame m to the network side in the uplink subframe 2 in the radio frame m+1; or The control transceiver 1010 feeds back to the network side in the uplink subframe n+1+k that all of the data in the downlink subframe n is used for

ACK/NAK information corresponding to the PDSCH transmitted on the PDSCH and the PDSCH transmitted on the first M OFDM symbols of the downlink subframe n+1, where the uplink subframe n+1+k is the transmission ACK corresponding to the subframe n+1. The uplink subframe of the NAK information, where k is a preset parameter; or

The control transceiver 1010 feeds back, to the network side, the ACK/NAK information corresponding to the first TB transmitted on all OFDM symbols used for PDSCH transmission in the downlink subframe n on the uplink subframe n+k, where the uplink subframe The frame n+k is an uplink subframe for transmitting ACK/NAK information corresponding to the downlink subframe n, where k is a preset parameter; and the uplink subframe is fed back to the network side on the uplink subframe n+1+k′ ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in the subframe n+1, where the uplink subframe n+1+k' is the transmission ACK/NAK information corresponding to the downlink subframe n+1 The uplink subframe, k' is a preset parameter.

The processor 1000 is specifically configured to: control, by the transceiver 1010, the uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m in the downlink subframe 5 in the radio frame m-1, and in the wireless The downlink subframe 1 in the frame m+1 receives the ACK/NAK information corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m; or

If the carrier transmitting the UL grant uses the TDD uplink and downlink configuration 0, the control transceiver 1010 receives the PUSCH transmitted in the uplink subframe 7 and the uplink subframe 8 in the radio frame m in the downlink subframe 0 in the radio frame m. UL grant, Receiving, in the downlink subframe 5 in the radio frame m-1, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 and the uplink subframe 3 in the radio frame m; or

If the carrier transmitting the UL grant uses the TDD uplink and downlink configuration 1, the control transceiver 1010 receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 in the radio frame m in the downlink subframe 0 of the radio frame m, in the wireless The downlink subframe 5 in the frame m-1 receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m; or, if the carrier transmitting the UL grant adopts the TDD uplink and downlink configuration 6, the control transceiver 1010 is The downlink subframe 0 in the radio frame m receives the UL grant corresponding to the PUSCH transmitted in the uplink subframe 8 in the radio frame m, and receives the uplink subframe 3 in the radio frame m in the downlink subframe 5 in the radio frame m-1. The UL grant corresponding to the PUSCH transmitted inside.

In Figure 10, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1000 and various circuits of memory represented by memory 1020. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 1010 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 1030 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 1000 is responsible for managing the bus architecture and the usual processing, and the memory 1020 can store data used by the processor 1000 in performing operations.

In summary, in the embodiment of the present application, a data transmission mode is redesigned, that is, when n=0 or 5, the first M OFDM symbols in the subframe n+1 are used as the downlink resource and the subframe n. All OFDM symbols used for PDSCH transmission are subjected to PDSCH scheduling transmission together, wherein DL grant and UL grant are not transmitted in subframe n+1, so that resources in subframe 1 and subframe 5 can be fully utilized, thereby avoiding resource waste. At the same time, it effectively improves resource utilization.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can be in the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the present application has been described, those skilled in the art can make additional changes and modifications to the embodiments once they are aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Therefore, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims

Rights request

1. A data transmission method, characterized by including:

Send downlink scheduling signaling DL grant to the user terminal UE, the DL grant is used to schedule the physical downlink shared channel PDSCH transmission in the downlink subframe n, where n = 0 or 5;

Based on the sent DL grant, PDSCH is transmitted to the UE on all orthogonal frequency division multiplexing OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1, where M is not greater than A positive integer of N, where N is the maximum number of OFDM symbols in the downlink subframe.

2. The method according to claim 1, characterized in that,

The DL grant is transmitted through the physical downlink control channel PDCCH; or,

The DL grant is transmitted through the enhanced physical downlink control channel EPDCCH; or,

The DL grant is transmitted in downlink subframe n; or,

The DL grant is transmitted in the downlink subframe before downlink subframe n.

3. The method according to claim 1, wherein the PDSCH is transmitted to the UE through the same frequency band on downlink subframe n and subframe n+1.

4. The method according to claim 1, 2 or 3, characterized in that, PDSCH is transmitted to the UE on all OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1. , including: encoding a transport block TB to obtain coding information, mapping the coding information to all OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1 for transmission;

or,

After encoding the first TB, the first encoding information is obtained, and the first encoding information is mapped to all OFDM symbols used for PDSCH transmission in the downlink subframe n for transmission; after encoding the second TB, the second encoding information is obtained , mapping the second coding information to the first M OFDM symbols in subframe n+1 for transmission.

5. The method of claim 4, further comprising:

Receive the correct response command/error response command ACK/NAK information corresponding to the PDSCH transmission in the wireless frame m fed back by the UE in the uplink subframe 2 in the wireless frame m+1; or,

Receive the ACK/ACK/ NAK information, where uplink subframe n+1+k is the uplink subframe corresponding to subframe n+1 that transmits ACK/NAK information, and k is a preset parameter; or,

The UE feedback received on the uplink subframe n+k is mapped to all the signals used for PDSCH transmission in the downlink subframe n.

ACK/NAK information corresponding to the first TB transmitted on OFDM symbols, where uplink subframe n+k is downlink subframe n In the corresponding uplink subframe for transmitting ACK/NAK information, k is a preset parameter; in the uplink subframe, the UE feedback is received on the uplink subframe n+1+k' and is mapped to the first M in subframe n+1 The ACK/NAK information corresponding to the second TB transmitted on OFDM symbols, where uplink subframe n+ 1 +k' is the uplink subframe corresponding to subframe n+ 1 for transmitting ACK/NAK information, and k' is a preset parameter.

6. The method of claim 1, 2 or 3, further comprising:

The uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m is sent in the downlink subframe 5 of the radio frame m-1, and in the downlink subframe 1 of the radio frame m+1 Send the ACK/NAK information corresponding to the PUSCH transmitted in uplink subframe 2 in wireless frame m; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 0, then the UL grant corresponding to the PUSCH transmitted in uplink subframe 7 and uplink subframe 8 in wireless frame m is sent in downlink subframe 0 in wireless frame m. In downlink subframe 5 in frame m-1, the UL grant corresponding to the PUSCH transmitted in uplink subframe 2 and uplink subframe 3 in wireless frame m is sent; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 1, then the UL grant corresponding to the PUSCH transmitted in uplink subframe 7 in radio frame m is sent in downlink subframe 0 in radio frame m, and in radio frame m-1 Send the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 of the radio frame m in the downlink subframe 5; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 6, then the UL grant corresponding to the PUSCH transmitted in uplink subframe 8 in radio frame m is sent in downlink subframe 0 in radio frame m, and in radio frame m-1 The UL grant corresponding to the PUSCH transmitted in the uplink subframe 3 of the radio frame m is sent in the downlink subframe 5 of the radio frame m.

7. A data transmission method, characterized by including:

Receive the downlink scheduling signaling DL grant sent by the network side, the DL grant is used to schedule the physical downlink shared channel PDSCH transmission in the downlink subframe n, where n = 0 or 5;

Based on the received DL grant, receive PDSCH on all orthogonal frequency division multiplexing OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1, where M is not greater than N A positive integer, N is the maximum number of OFDM symbols used for PDSCH transmission in the downlink subframe.

8. The method of claim 7, characterized in that,

The DL grant is received through the physical downlink control channel PDCCH; or,

The DL grant is received through the enhanced physical downlink control channel EPDCCH; or,

The DL grant is received in downlink subframe n; or,

The DL grant is received in the downlink subframe before downlink subframe n.

9. The method of claim 7, wherein the PDSCH is received through the same frequency band on downlink subframe n and subframe n+1.

10. The method according to claim 7, 8 or 9, characterized in that, based on the received DL grant, all orthogonal frequency division multiplexing OFDM symbols used for PDSCH transmission in downlink subframe n and subframe n+1 PDSCH is received on the first M OFDM symbols, including:

Determine the number of resource blocks N' occupied by the current PDSCH transmission based on the received DL grant, and determine the size of the TB based on the N _PRB . The TB is mapped to the OFDM symbols used for PDSCH transmission in the downlink subframe n and the top of the subframe n+1. Transmitted on M OFDM symbols, where, N _ras

X", 1 ^<A<2 , pre-agreed by the standard or pre-configured by the network side; or,

Determine the number N of resource blocks occupied by the current PDSCH transmission based on the received DL grant, determine the first TB size according to _∞ , and map the first TB to all OFDM symbols used for PDSCH transmission in the downlink subframe n for transmission; and according to N _{PRB n+} determines the size of the second TB, which is mapped to the first M OFDM symbols in subframe n+1 for transmission, where Np = L RB It is pre-agreed by the standard or pre-configured by the network side.

11. The method of claim 10, further comprising:

Uplink subframe 2 in wireless frame m+1 feeds back to the network side the correct response command/error response command ACK/NAK information corresponding to all PDSCHs in wireless frame m; or,

Feed back to the network side on the uplink subframe n+1+k all OFDM symbols used for PDSCH transmission in the downlink subframe n and the ACK corresponding to the PDSCH transmitted on the first M OFDM symbols of the downlink subframe n+1 /NAK information, where, uplink subframe n+1+k is the uplink subframe corresponding to subframe n+1 that transmits ACK/NAK information, and k is a preset parameter; or,

Feed back to the network side on the uplink subframe n+k all the information mapped to the downlink subframe n used for PDSCH transmission.

ACK/NAK information corresponding to the first TB transmitted on OFDM symbols, where uplink subframe n+k is the uplink subframe corresponding to downlink subframe n that transmits ACK/NAK information, k is a preset parameter; in the uplink subframe The ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in subframe n+1 is fed back to the network side on uplink subframe n+1+k', where, uplink subframe n+1 +k' is the uplink subframe corresponding to downlink subframe n+1 that transmits ACK/NAK information, and k' is a preset parameter.

12. The method of claim 7, 8 or 9, further comprising:

The uplink scheduling signaling UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 in the radio frame m is received in the downlink subframe 5 of the radio frame m-1, and in the downlink subframe 1 of the radio frame m+1 Send the ACK/NAK information corresponding to the PUSCH transmitted in uplink subframe 2 in radio frame m; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 0, then it is connected in downlink subframe 0 in radio frame m. Receive the UL grant corresponding to the PUSCH transmitted in uplink subframe 7 and uplink subframe 8 in radio frame m, and receive uplink subframe 2 and uplink subframe 3 in radio frame m in downlink subframe 5 in radio frame m-1. UL grant corresponding to the PUSCH transmitted within; or,

If the carrier transmitting the UL grant adopts TDD uplink and downlink configuration 1, then the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 of the radio frame m is received in the downlink subframe 0 of the radio frame m, and in the radio frame m-1 Receive the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 of the radio frame m in the downlink subframe 5; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 6, then the UL grant corresponding to the PUSCH transmitted in uplink subframe 8 in radio frame m is received in downlink subframe 0 in radio frame m, and in radio frame m-1 In the downlink subframe 5 of the radio frame m, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 3 is received.

13. A data transmission device, characterized in that it includes:

The communication unit is used to send downlink scheduling signaling DL grant to the user terminal UE, and the DL grant is used to schedule the physical downlink shared channel PDSCH transmission in the downlink subframe n, where n = 0 or 5;

The processing unit is configured to transmit the PDSCH to the UE based on the transmitted DL grant on all orthogonal frequency division multiplexing OFDM symbols used for PDSCH transmission in the downlink subframe n and the first M OFDM symbols in the subframe n+1, where , M is a positive integer not greater than N, and N is the maximum number of OFDM symbols in the downlink subframe.

14. The device according to claim 13, characterized in that the communication unit is specifically used for:

Transmit the DL grant in downlink subframe n; or,

15. The apparatus according to claim 13, wherein the processing unit transmits PDSCH to the UE through the same frequency band on downlink subframe n and subframe n+1.

16. The device according to claim 13, 14 or 15, wherein the processing unit is specifically configured to: encode a transport block TB to obtain encoding information, and map the encoding information to all the downlink subframes n. Transmission is performed on the OFDM symbols used for PDSCH transmission and the first M OFDM symbols in subframe n+1;

or,

17. The apparatus according to claim 16, wherein the communication unit is further configured to: receive the correct PDSCH transmission corresponding to the radio frame m fed back by the UE in the uplink subframe 2 of the radio frame m+1. Response command/error response command ACK/NAK information; or,

Receive the ACK/NAK information fed back by the UE on the uplink subframe n+k and mapped to the first TB corresponding to the transmission on all OFDM symbols used for PDSCH transmission in the downlink subframe n, where, the uplink subframe n+k is the uplink subframe for transmitting ACK/NAK information corresponding to downlink subframe n, and k is a preset parameter; in the uplink subframe, the mapping of UE feedback received on uplink subframe n+1+k' to subframe n+ ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in 1, where uplink subframe n+1+k' is the uplink subframe corresponding to subframe n+1 for transmitting ACK/NAK information, k' is a default parameter.

18. The device according to claim 13, 14 or 15, wherein the communication unit is further configured to: transmit in the downlink subframe 5 of the wireless frame m-1 within the uplink subframe 2 of the wireless frame m The uplink scheduling signaling UL grant corresponding to the transmitted PUSCH, and the ACK/NAK information corresponding to the PUSCH transmitted in the uplink subframe 2 of the radio frame m is sent in the downlink subframe 1 of the radio frame m+1;

If the carrier transmitting the UL grant adopts TDD uplink and downlink configuration 1, then the UL grant corresponding to the PUSCH transmitted in the uplink subframe 7 of the radio frame m is sent in the downlink subframe 0 of the radio frame m, and in the radio frame m-1 Send the UL grant corresponding to the PUSCH transmitted in the uplink subframe 2 of the radio frame m in the downlink subframe 5; or,

19. A data transmission device, characterized in that it includes:

The communication unit is configured to receive the downlink scheduling signaling DL grant sent by the network side. The DL grant is used to schedule the physical downlink shared channel PDSCH transmission in the downlink subframe n, where n = 0 or 5;

The main control unit is configured to receive PDSCH based on the received DL grant on all orthogonal frequency division multiplexing OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1, where, M is a positive integer not greater than N, and N is the maximum number of OFDM symbols used for PDSCH transmission in the downlink subframe.

20. The device according to claim 19, characterized in that the communication unit is specifically used for:

Receive the DL grant through the physical downlink control channel PDCCH; or,

Receive the DL grant through the enhanced physical downlink control channel EPDCCH; or,

Receive the DL grant in downlink subframe n; or,

The DL grant is received in the downlink subframe before downlink subframe n.

21. The device according to claim 19, wherein the main control unit receives PDSCH through the same frequency band on downlink subframe n and subframe n+1.

22. The device according to claim 19, 20 or 21, wherein the main control unit is specifically configured to: determine the number N' of resource blocks currently occupied by PDSCH transmission based on the received DL grant, and determine based on N _PRB The size of TB, which is mapped to all OFDM symbols used for PDSCH transmission in downlink subframe n and the first M OFDM symbols in subframe n+1, where, N _raB

, 1<A<2, pre-agreed by the standard or pre-configured by the network side; or,

Determine the number of resource blocks occupied by the current PDSCH transmission based on the received DL grant N', determine the first TB size according to n, and the first TB is mapped to transmission on all OFDM symbols used for PDSCH transmission in the downlink subframe n; and according to N _{PRB n+1} determines the size of the second TB, which is mapped to the first M OFDM symbols in subframe n+1 for transmission, where N _fflB ,„ ₊₁ = [ !^ '", 0<A'<1,A' is pre-agreed by the standard or pre-configured by the network side.

23. The apparatus according to claim 22, wherein the communication unit is further configured to: feed back to the network side correct responses corresponding to all PDSCHs in the radio frame m in the uplink subframe 2 in the radio frame m+1. Command/error response command ACK/NAK message; or,

ACK/NAK information corresponding to the first TB transmitted on OFDM symbols, where uplink subframe n+k is the uplink subframe corresponding to downlink subframe n that transmits ACK/NAK information, k is a preset parameter; in the uplink subframe The ACK/NAK information corresponding to the second TB transmitted on the first M OFDM symbols in subframe n+1 is fed back to the network side on the uplink subframe n+1+k', where, uplink subframe n+1 +k' is the uplink subframe corresponding to downlink subframe n+1 that transmits ACK/NAK information, and k' is a preset parameter.

24. The device according to claim 19, 20 or 21, wherein the communication unit is further configured to: receive in uplink subframe 2 of wireless frame m in downlink subframe 5 of wireless frame m-1. The uplink scheduling signaling UL grant corresponding to the transmitted PUSCH, and the uplink subframe in the radio frame m received in the downlink subframe 1 in the radio frame m+1

ACK/NAK information corresponding to the PUSCH transmitted within 2; or,

If the carrier transmitting UL grant adopts TDD uplink and downlink configuration 0, then the UL grant corresponding to the PUSCH transmitted in uplink subframe 7 and uplink subframe 8 in wireless frame m is received in downlink subframe 0 in wireless frame m. Receive the UL grant corresponding to the PUSCH transmitted in uplink subframe 2 and uplink subframe 3 in wireless frame m in downlink subframe 5 in frame m-1; or,

If the carrier transmitting the UL grant adopts TDD uplink and downlink configuration 6, then the UL grant corresponding to the PUSCH transmitted in the uplink subframe 8 of the radio frame m is received in the downlink subframe 0 of the radio frame m, and in the radio frame m-1 In the downlink subframe 5 of the radio frame m, the UL grant corresponding to the PUSCH transmitted in the uplink subframe 3 is received.