CN110635885B

CN110635885B - Data transmission method and device

Info

Publication number: CN110635885B
Application number: CN201910792337.3A
Authority: CN
Inventors: 栗忠峰
Original assignee: Beijing Jingshi Intellectual Property Management Co ltd
Current assignee: Beijing Heyi Management Consulting Co ltd
Priority date: 2014-01-29
Filing date: 2014-01-29
Publication date: 2024-01-26
Anticipated expiration: 2034-01-29
Also published as: CN105594274B; CN105594274A; CN110635885A; WO2015113295A1; CN110582123A; CN110582123B

Abstract

The embodiment of the invention provides a data transmission method and device, wherein the method comprises the following steps: the UE determines a transport block size TBS; the UE determines time domain resources and frequency resources for transmitting a Physical Downlink Shared Channel (PDSCH), wherein the PDSCH is used for transmitting the transmission block; the UE receives the transmission block on the time domain resource and the frequency resource. The data transmission method and the data transmission device provided by the embodiment of the invention can reduce the control signaling overhead, thereby improving the transmission efficiency of the system.

Description

Data transmission method and device

Technical Field

The present invention relates to communications technologies, and in particular, to a data transmission method and apparatus.

Background

The development of communication technology is undergoing an expansion from person-to-person communication, to person-to-object communication, to object-to-object communication. Along with the diversification of communication forms, the contents of communication also appear to be diversified. From the size of the data packet, communication of small data packets is becoming an important component of communication traffic. As currently discussed by the third generation partnership project (3 rd Generation Partnership Project, abbreviated as 3 GPP) standards organization for machine type communication (machine type communication, abbreviated as MTC), the data block size (transport block size, abbreviated as TBS) defining its physical layer does not exceed 1000 bits. Existing systems use downlink control information formats (downlink control information format, DCI formats for short) when the physical layer schedules/controls Downlink (DL) or Uplink (UL) data transmissions, which are transmitted on a physical downlink control channel (physical downlink control channel, PDCCH for short) or an enhanced physical downlink control channel (enhanced physical downlink control channel, EPDCCH for short). The corresponding DCI formats of the scheduling UL data comprise DCI format0 and DCI format4, wherein the format0 is a UE aiming at a single antenna port, and the format4 is a UE aiming at a multi-antenna port; the DCI formats for scheduling DL data include DCI formats 1, 1A, 1B, 1C, 1D, 2A, 2B, 2C, and 2D, wherein formats 1 to 1D are for single code words, and data is transmitted when the channel rank is 1. The formats 2A-2D can be used for data transmission when the channel rank is greater than 1.

The current LTE system adopts downlink control information DCI for DL/UL scheduling of small data packets. When transmitting small data packet service, the cost of control signaling is not different from the service data to be transmitted, so that the signaling cost occupies a larger proportion in the data transmission process. For example, 1 subframe/TTI is allocated only for large or small packets for transmission. The system bandwidth is 10mhz, the dl signaling uses DCI format1A, and the corresponding DCI size is 28 bits. There are 4 kinds of transport block sizes: 2000 bits, 1000 bits, 200 bits and 40 bits. Assuming that the data and bits of the signaling fairly share resources within 1 subframe, the ratio of the corresponding signaling to the number of bits used for the data is: 1.4%,2.8%,14%,70%, with corresponding proportions of occupied resources of about 1.4%,2.8%,14%,70%.

It can be seen that the control signaling overhead of the data transmission method of the prior art is excessive for the transmission of small data, resulting in a reduction of the system capacity.

Disclosure of Invention

The embodiment of the invention provides a data transmission method and a data transmission device, which are used for reducing the signaling overhead of a physical layer and improving the system capacity.

In a first aspect, an embodiment of the present invention provides a user equipment UE, including:

A determining module, configured to determine a transport block size TBS;

the determining module is further configured to determine a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

and the receiving module is used for receiving the transmission block on the time domain resource and the frequency resource.

In a first possible implementation manner of the first aspect, the determining module is specifically configured to: determining the size of the transmission block as a preset TBS; or,

receiving a first signaling sent by a base station, and determining the size TBS of the transport block according to indication information in the first signaling, wherein the first signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

In a second possible implementation manner of the first aspect, the determining module is specifically configured to:

determining a coding rate of transmitting the PDSCH;

the receiving module is specifically configured to receive, on the time domain resource and the frequency resource, the transport block according to the coding rate of the PDSCH.

In a third possible implementation form of the second possible implementation form of the first aspect, the coding rate of the PDSCH comprises an aggregation level of resource granularity of the PDSCH;

The determining module is specifically configured to:

determining an aggregation level of resource granularity of transmitting PDSCH according to the configuration of the base station; or,

determining the aggregation level of the resource granularity of transmitting the PDSCH as a preset aggregation level;

wherein, the aggregation level of the resource granularity of transmitting PDSCH includes: the aggregation level of the resource granularity CCEs transmitting the physical downlink control channel PDCCH or the resource granularity ECCE transmitting the enhanced physical downlink control channel EPDCCH may be a subset of the aggregation level, or the aggregation level transmitting the PDSCH may comprise at least an aggregation level 6.

In a fourth possible implementation manner according to the third possible implementation manner of the first aspect, the resource granularity includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

In a fifth possible implementation manner according to the first aspect, any one of the first to fourth possible implementation manners of the first aspect, the determining module is specifically configured to:

determining a Resource Block (RB) for transmitting the PDSCH as a preset RB; or,

receiving a second signaling sent by a base station, and determining a Resource Block (RB) for transmitting a PDSCH according to indication information in the second signaling, wherein the second signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a sixth possible implementation manner according to the first aspect, any one of the first to fourth possible implementation manners of the first aspect, the determining module is specifically configured to:

determining the bandwidth of the PDSCH according to the configuration of the base station;

receiving a third signaling sent by a base station, and determining a first starting position of the frequency resource of the PDSCH according to indication information in the third signaling, wherein the third signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a fifth or sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the determining module is specifically configured to:

receiving a fourth signaling sent by a base station, and determining a second starting position of a frequency resource for monitoring the PDSCH according to indication information in the fourth signaling, wherein the fourth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling; or,

and determining a second starting position of the frequency resource for monitoring the PDSCH according to a preset hash function.

In an eighth possible implementation manner of the first aspect, the determining module is specifically configured to:

receiving a fifth signaling sent by a base station, and determining a time domain resource for transmitting a PDSCH as a first subframe according to indication information in the fifth signaling, wherein the fifth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling; or,

And determining the subframe of the PDSCH as a preset first subframe.

In a ninth possible implementation manner of the eighth possible implementation manner of the first aspect, the indication information in the fifth signaling further includes a discontinuous reception period and a start subframe of the discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer and/or a time corresponding to an inactivity timer.

In a tenth possible implementation manner according to the ninth possible implementation manner of the first aspect, the first subframe used for transmitting the PDSCH is a subframe within the active time.

According to any one of the first to tenth possible implementations of the first aspect, in an eleventh possible implementation, the method further includes:

the sending module is used for sending an acknowledgement message ACK to the base station after the receiving module correctly receives the PDSCH; or after the determining module determines that the PDSCH cannot be received, sending a non-acknowledgement message NACK to the base station.

According to any one of the first to eleventh possible implementations of the first aspect, in a twelfth possible implementation, the method further includes:

And the monitoring module is used for monitoring the control channel and/or the PDSCH in the search space configured by the base station and/or the first time configured by the base station.

In a thirteenth possible implementation manner according to the twelfth possible implementation manner of the first aspect, when the listening module listens to the control channel and the PDSCH in different first times respectively, a time interval of the first time of the listening control channel is greater than or less than a time interval of the first time of listening to the PDSCH.

In a thirteenth possible implementation manner according to the first aspect, in a fourteenth possible implementation manner, the monitoring module is specifically configured to: when monitoring the control channel and the PDSCH in the search space configured by the base station and/or the time configured by the base station, the control channel and the PDSCH are distinguished by the size TBS of the transmission block, or the control channel and the PDSCH are distinguished according to at least one of the granularity of resources, the time domain position and the frequency domain position, or the control channel and the PDSCH are distinguished according to the preset first indication information.

In a fifteenth possible implementation manner according to the fourteenth possible implementation manner of the first aspect, the monitoring module is specifically configured to:

The DCI and the PDSCH are distinguished according to a scrambling code scrambled by a cyclic redundancy check CRC or the control channel and the PDSCH are distinguished according to a first indication information in a newly added indication bit or an original bit in the DCI.

In a sixteenth possible implementation form of the method according to any one of the first to fifteenth possible implementation forms of the first aspect, the TBS is a subset of TBSs specified by the long term evolution, LTE, protocol.

In a seventeenth possible implementation form according to any of the first aspect as such or to the first to sixteenth possible implementation forms of the first aspect, the determining module is further configured to:

determining that the PDSCH is in a listening mode according to a preset rule, or,

receiving a sixth signaling sent by a base station, and determining that the PDSCH is in a listening mode according to indication information in the sixth signaling, where the sixth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a second aspect, an embodiment of the present invention provides a UE, including: a determining module, configured to determine a range of frequency resources indicated by downlink control information DCI;

the determining module is further configured to determine a frequency resource for data transmission according to the indication information in the DCI;

And the data transmission module is used for transmitting data on the frequency resource used for data transmission.

In a first possible implementation manner of the second aspect, the determining module is specifically configured to:

adopting a preset first frequency resource as a range of frequency resources for DCI indication; or,

receiving a seventh signaling sent by the base station, and determining the range of the frequency resource for DCI indication according to indication information in the seventh signaling, wherein the seventh signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

According to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the method further includes:

and the receiving module is used for receiving second DCI sent by the base station, wherein the DCI indicates the coding rate of the data.

In a third possible implementation manner according to the second possible implementation manner of the second aspect, the coding rate includes an aggregation level of resource granularity of the data.

In a fourth possible implementation manner according to any one of the second aspect, the first to third possible implementation manners of the second aspect, the determining module is further configured to:

Before the data transmission module transmits data on the frequency resource for data transmission, determining that a transport block size TBS of the data is a preset TBS, or receiving an eighth signaling sent by the base station, and determining the TBS according to indication information in the eighth signaling, where the eighth signaling includes at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a fifth possible implementation manner according to any one of the second aspect, the first to third possible implementation manners of the second aspect, the determining module is further configured to:

and receiving third DCI sent by the base station, and determining TBS under a specific modulation mode according to the indication information in the DCI, wherein the specific modulation mode is determined through preset or signaling configuration.

According to any one of the second aspect, the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner:

when the system bandwidth is one of {1.4mhz,3mhz,5mhz,10mhz,15mhz,20mhz }, or one of {6rb,15rb,30rb,50rb,75rb,100rb }, the range of the frequency resource for DCI indication is smaller than the system bandwidth.

According to any one of the second aspect, the first to sixth possible implementation manners of the second aspect, in a seventh possible implementation manner, the receiving module is further configured to:

receiving a second subframe configured by the base station;

the determining module is further configured to determine to monitor a common control channel of the UE in the second subframe.

In a seventh possible implementation manner of the second aspect, in an eighth possible implementation manner, the period of the second subframe is an integer multiple of the discontinuous reception cycle DRX.

In a third aspect, an embodiment of the present invention provides a base station, including:

a determining module, configured to determine a transport block size TBS to be sent;

and the sending module is used for sending the transmission block to the User Equipment (UE) on the time domain resource and the frequency resource.

In a first possible implementation manner of the third aspect, the determining module is specifically configured to:

determining the size of the transmission block as a preset TBS; or,

transmitting a first signaling to the UE, wherein the first signaling includes indication information for determining a transport block size TBS, and the first signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

In a second possible implementation manner of the third aspect, the determining module is further configured to:

determining the coding rate of the PDSCH;

the sending module is specifically configured to send the transport block to the UE according to the coding rate of the PDSCH on the time domain resource and the frequency resource.

According to a second possible implementation manner of the third aspect, in a third possible implementation manner, a coding rate of a PDSCH includes an aggregation level of resource granularity of the PDSCH;

the determining module is specifically configured to:

determining the aggregation level of the resource granularity of transmitting the PDSCH as a preset aggregation level; or,

transmitting configuration information of aggregation level to the UE so that the UE determines the aggregation level of resource granularity for transmitting PDSCH according to the configuration information;

the aggregation level of the resource granularity of the PDSCH includes a subset of the aggregation level of the resource granularity CCE of the physical downlink control channel PDCCH or the resource granularity ECCE of the enhanced physical downlink control channel EPDCCH, or the aggregation level of the resource granularity of the PDSCH at least includes an aggregation level 6.

According to a third possible implementation manner of the third aspect, in a fourth possible implementation manner, the aggregation level includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

According to any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner, the determining module is specifically configured to:

transmitting a second signaling to the UE, where the second signaling includes indication information for determining a resource block RB of the PDSCH, and the second signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to any one of the first to fourth possible implementation manners of the third aspect, in a sixth possible implementation manner, the determining module is specifically configured to:

determining the bandwidth for transmitting the PDSCH as a preset bandwidth;

transmitting third signaling to the UE, where the third signaling includes indication information for determining a first starting position of a frequency resource of a PDSCH, and the third signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to a fifth or sixth possible implementation manner of the third aspect, in a seventh possible implementation manner, the determining module is further configured to:

transmitting fourth signaling to the UE, where the fourth signaling includes indication information for enabling the UE to determine a second starting position of a frequency resource for listening to the PDSCH, and the fourth signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In an eighth possible implementation manner of the third aspect, the determining module is specifically configured to:

determining a time domain resource for transmitting the PDSCH as a preset first subframe; or,

and fifth signaling sent to the UE, where the fifth signaling includes indication information for determining a first subframe for transmitting the PDSCH.

According to an eighth possible implementation manner of the third aspect, in a ninth possible implementation manner, the indication information in the fifth signaling further includes a discontinuous reception period and a start subframe of the discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer and/or a time corresponding to an inactivity timer.

According to a ninth possible implementation manner of the third aspect, in a tenth possible implementation manner, the first subframe used for transmitting the PDSCH is a subframe in the active time.

According to any one of the first to tenth possible implementations of the third aspect, in an eleventh possible implementation, the method further includes:

and the receiving module is used for receiving the acknowledgement message ACK or the non-acknowledgement message NACK sent by the UE.

According to an eleventh possible implementation manner of the third aspect, in a twelfth possible implementation manner, when the base station does not receive the acknowledgement message ACK sent by the UE in a first preset time, the base station retransmits the transport block in a second preset time.

According to any one of the first to twelfth possible implementations of the third aspect, in a thirteenth possible implementation, the sending module is further configured to:

and sending a control channel and/or a PDSCH to the UE in a preset search space and/or a preset first time.

In a thirteenth possible implementation manner of the third aspect, in a fourteenth possible implementation manner, when the transmitting module transmits a control channel and a PDSCH in different first times, respectively, a time interval of the first time of transmitting the control channel is greater than or less than a time interval of the first time of transmitting the PDSCH.

According to a thirteenth or fourteenth possible implementation manner of the third aspect, in a fifteenth possible implementation manner, when the sending module sends a control channel and a PDSCH to the UE in a preset search space and/or a preset first time, the control channel or the PDSCH further includes preset first indication information, which is used for the UE to distinguish the control channel and the PDSCH.

According to any one of the first to fifteenth possible implementations of the third aspect, in a sixteenth possible implementation, the TBS is a subset of TBSs specified by a long term evolution, LTE, protocol.

According to any one of the first to sixteenth possible implementations of the third aspect, in a seventeenth possible implementation, the determining module is further configured to:

transmitting a sixth signaling to the UE, where the sixth signaling includes indication information for determining that the PDSCH is in a listening mode, and the sixth signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to any one of the first to seventeenth possible implementation manners of the third aspect, in an eighteenth possible implementation manner, the sending module is specifically configured to:

when a Physical Downlink Shared Channel (PDSCH) is transmitted by adopting a non-MBSFN subframe, transmitting the PDSCH by adopting an antenna port 0 or adopting a transmission diversity mode;

when PDSCH is transmitted using MBSFN subframes, the PDSCH is transmitted using antenna port 7.

In a fourth aspect, an embodiment of the present invention provides a base station, including:

a determining module, configured to determine a range of frequency resources indicated by downlink control information DCI;

a sending module, configured to send the DCI to a user equipment UE, so that the UE determines a frequency resource for data transmission according to indication information in the DCI;

And the data transmission module is used for carrying out data transmission by adopting the frequency resource for data transmission.

In a first possible implementation manner of the fourth aspect, the determining module is specifically configured to:

transmitting seventh signaling to the UE, where the seventh signaling includes indication information for determining the range of the frequency resource used for DCI indication, and the seventh signaling is at least one of: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

According to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the sending module is further configured to:

and sending second DCI to the UE, wherein the second DCI comprises indication information for indicating the coding rate of the data.

In a third possible implementation manner according to the second possible implementation manner of the fourth aspect, the coding rate indicated by the second DCI includes an aggregation level indicated by the DCI.

According to any one of the fourth aspect, the first to third possible implementation manners of the fourth aspect, in a fourth possible implementation manner, the determining module is further configured to:

Determining the transport block size TBS of the transmission data as a preset TBS, or,

transmitting eighth signaling to the UE, where the eighth signaling includes indication information for determining the TBS, and the eighth signaling includes at least one of the following: RRC signaling, MAC CE signaling, or DCI.

In a fifth possible implementation manner according to any one of the fourth aspect, the first to third possible implementation manners of the fourth aspect, the determining module is further configured to:

determining TBS under the specific modulation mode of the transmission data, wherein the specific modulation mode is determined through preset or signaling configuration;

and sending third DCI to the UE, wherein the third DCI comprises indication information for determining TBS under a specific modulation mode.

According to any one of the fourth aspect, the first to fifth possible implementation manners of the fourth aspect, in a sixth possible implementation manner:

when the system bandwidth is one of {1.4mhz,3mhz,5mhz,10mhz,15mhz,20mhz }, or one of {6rb,15rb,30rb,50rb,75rb,100rb }, the frequency range for DCI indication is smaller than the system bandwidth.

According to any one of the fourth aspect, the first to sixth possible implementation manners of the fourth aspect, in a seventh possible implementation manner, the sending module is further configured to:

And sending a configuration message containing a second subframe to the UE, wherein the configuration message is used for indicating the UE to monitor a common control channel of the UE in the second subframe.

In a seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner, the period of the second subframe is an integer multiple of the discontinuous reception cycle DRX.

In a fifth aspect, an embodiment of the present invention provides a data transmission method, including:

the User Equipment (UE) determines a Transport Block Size (TBS);

the UE determines time domain resources and frequency resources for transmitting a Physical Downlink Shared Channel (PDSCH), wherein the PDSCH is used for transmitting the transmission block;

the UE receives the transmission block on the time domain resource and the frequency resource.

In a first possible implementation manner of the fifth aspect, the determining, by the UE, a transport block size TBS includes:

the UE determines the size of the transmission block as a preset TBS; or,

the UE receives a first signaling sent by a base station, and determines the size TBS of the transmission block according to indication information in the first signaling, wherein the first signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

In a second possible implementation manner of the fifth aspect, the method further includes: the UE determines the coding rate of transmitting the PDSCH;

The UE receiving the transport block on the time domain resource, frequency resource, comprising:

and the UE receives the transmission block according to the coding rate on the time domain resource and the frequency resource.

According to a second possible implementation manner of the fifth aspect, in a third possible implementation manner, the coding rate of the PDSCH is transmitted, including an aggregation level of resource granularity of transmitting the PDSCH;

the UE determining a coding rate for transmitting PDSCH, comprising:

the UE determines the aggregation level of the resource granularity of transmitting the PDSCH according to the configuration of the base station; or,

the UE determines that the aggregation level of the resource granularity of transmitting the PDSCH is a preset aggregation level;

According to a third possible implementation manner of the fifth aspect, in a fourth possible implementation manner, the resource granularity includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

In a fifth possible implementation manner according to any one of the fifth aspect and the first to fourth possible implementation manners of the fifth aspect, the determining, by the UE, a frequency resource for transmitting the PDSCH includes:

the UE determines that a Resource Block (RB) for transmitting the PDSCH is a preset RB; or,

the UE receives a second signaling sent by a base station, and determines a Resource Block (RB) for transmitting a PDSCH according to indication information in the second signaling, wherein the second signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a sixth possible implementation manner according to any one of the fifth aspect and the first to fourth possible implementation manners of the fifth aspect, the determining, by the UE, a frequency resource for transmitting the PDSCH includes:

the UE determines the bandwidth of the PDSCH according to the configuration of the base station;

the UE receives a third signaling sent by a base station, and determines a first starting position of the frequency resource of the PDSCH according to indication information in the third signaling, wherein the third signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a seventh possible implementation manner according to the fifth or sixth possible implementation manner of the fifth aspect, the determining, by the UE, a frequency resource for transmitting the PDSCH further includes:

The UE receives a fourth signaling sent by a base station, and determines a second starting position of the frequency resource for monitoring the PDSCH according to the indication information in the fourth signaling, wherein the fourth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling; or,

and the UE determines a second starting position of the frequency resource for monitoring the PDSCH according to a preset hash function.

In an eighth possible implementation manner of the fifth aspect, the determining, by the UE, a time domain resource for transmitting the PDSCH includes:

the UE receives a fifth signaling sent by a base station, and determines a time domain resource for transmitting a PDSCH as a first subframe according to indication information in the fifth signaling, wherein the fifth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH, or MAC CE signaling, or the UE determines a subframe of the PDSCH as a preset first subframe.

In a ninth possible implementation manner according to the eighth possible implementation manner of the fifth aspect, the indication information in the fifth signaling further includes a discontinuous reception period and a start subframe of the discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer and/or a time corresponding to an inactivity timer.

In a tenth possible implementation manner according to the ninth possible implementation manner of the fifth aspect, the first subframe used for transmitting PDSCH is a subframe in the active time.

In an eleventh possible implementation manner according to any one of the fifth aspect and the first to tenth possible implementation manners of the fifth aspect, after the UE receives the transport block according to the coding rate on the time domain resource and the frequency resource, the method further includes:

after the UE correctly receives the PDSCH, the UE sends an acknowledgement message ACK to a base station; or after the UE determines that the PDSCH cannot be received, the UE sends a non-acknowledgement message NACK to a base station.

According to any one of the fifth aspect, the first to eleventh possible implementation manners of the fifth aspect, in a twelfth possible implementation manner, the method further includes:

and the UE monitors a control channel and/or a PDSCH in the search space configured by the base station and/or the first time configured by the base station.

In a thirteenth possible implementation manner according to the twelfth possible implementation manner of the fifth aspect, when the UE listens to the control channel and the PDSCH in different time periods, respectively, a time interval of a first time of the listening control channel is greater than or less than a time interval of a first time of listening to the PDSCH.

In a thirteenth possible implementation manner of the fifth aspect, in a fourteenth possible implementation manner, when the UE listens to the control channel and the PDSCH in a search space configured by the base station and/or in a time configured by the base station, the control channel and the PDSCH are distinguished by a size TBS of a transport block, or the control channel and the PDSCH are distinguished according to at least one of a resource granularity, a time domain position, and a frequency domain position, or the control channel and the PDSCH are distinguished according to preset first indication information.

According to a fourteenth possible implementation manner of the fifth aspect, in a fifteenth possible implementation manner, the distinguishing the control channel and the PDSCH according to the preset first indication information includes:

In a sixteenth possible implementation form of the method according to any of the first to fifteenth possible implementation forms of the fifth aspect, the TBS is a subset of TBSs specified by the long term evolution, LTE, protocol.

According to any one of the fifth aspect, the first to sixteenth possible implementation manners of the fifth aspect, in a seventeenth possible implementation manner, the method further includes:

The UE determines that the PDSCH is in a listening mode according to a preset rule, or,

the UE receives a sixth signaling sent by a base station, and determines that the PDSCH is in a monitoring mode according to indication information in the sixth signaling, wherein the sixth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In a sixth aspect, an embodiment of the present invention provides a data transmission method, including:

the User Equipment (UE) determines a range of frequency resources for Downlink Control Information (DCI) indication;

the UE determines frequency resources for data transmission according to the indication information in the DCI;

the UE transmits data on the frequency resources for data transmission.

In a first possible implementation manner of the sixth aspect, the determining, by the UE, a range of frequency resources for DCI indication includes:

the UE adopts a preset first frequency resource as a range of the frequency resource for DCI indication; or,

the UE receives a seventh signaling sent by the base station, and determines the range of the frequency resource for DCI indication according to indication information in the seventh signaling, wherein the seventh signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

In a second possible implementation manner according to the sixth aspect or the first possible implementation manner of the sixth aspect, before the UE transmits data on the frequency resource for data transmission, the method further includes:

and the UE receives second DCI sent by the base station, wherein the DCI indicates the coding rate of the data.

According to a second possible implementation manner of the sixth aspect, in a third possible implementation manner, the coding rate includes an aggregation level of resource granularity of the data; or,

the coding rate comprises the number of PRBs of first data defining a modulation mode and TBS corresponding to the first data, and the modulation mode is defined by a preset or signaling configuration mode.

According to any one of the sixth aspect and the first to third possible implementation manners of the sixth aspect, before the UE transmits data on the frequency resource for data transmission, the method further includes:

the UE determines that the TBS of the transmission block size of the data is a preset TBS, or the UE receives an eighth signaling sent by the base station and determines the TBS according to indication information in the eighth signaling, wherein the eighth signaling comprises at least one of the following: RRC signaling, PDDCH, EPDCCH, or MAC CE signaling.

In a fifth possible implementation manner according to any one of the sixth aspect and the first to third possible implementation manners of the sixth aspect, before the UE transmits data on the frequency resource for data transmission, the method further includes:

the UE receives third DCI sent by the base station, and determines TBS under a specific modulation mode according to indication information in the DCI, wherein the specific modulation mode is determined through preset or signaling configuration.

According to any one of the sixth aspect, the first to fifth possible implementation manners of the sixth aspect, in a sixth possible implementation manner:

According to any one of the sixth aspect, the first to sixth possible implementation manners of the sixth aspect, in a seventh possible implementation manner, the method further includes:

and the UE receives a second subframe configured by the base station, and monitors a common control channel in the second subframe.

In a seventh possible implementation manner of the sixth aspect, in an eighth possible implementation manner, the period of the second subframe is an integer multiple of the discontinuous reception cycle DRX.

In a seventh aspect, an embodiment of the present invention provides a data transmission method, including:

the base station determines the size TBS of a transmission block to be transmitted;

the base station determines time domain resources and frequency resources for transmitting a Physical Downlink Shared Channel (PDSCH), wherein the PDSCH is used for transmitting the transport block;

and the base station transmits the transmission block to User Equipment (UE) on the time domain resource and the frequency resource.

In a first possible implementation manner of the seventh aspect, the determining, by the base station, a transport block size TBS includes:

the base station determines the size of the transmission block as a preset TBS; or,

the base station sends a first signaling to the UE, wherein the first signaling comprises indication information for determining a transport block size TBS, and the first signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

In a second possible implementation manner of the seventh aspect, the method further includes:

the base station determines the coding rate of transmitting the PDSCH;

The base station sends the transport block to user equipment UE on the time domain resource and the frequency resource, including:

and the base station transmits the transmission block to the User Equipment (UE) on the time domain resource and the frequency resource according to the coding rate.

According to a second possible implementation manner of the seventh aspect, in a third possible implementation manner, the coding rate of the transmitting PDSCH includes: aggregation level of resource granularity of the transmission PDSCH;

the base station determining a coding rate of transmitting PDSCH includes:

the base station determines that the aggregation level of the resource granularity of transmitting the PDSCH is a preset aggregation level; or the base station sends configuration information of aggregation level to the UE so that the UE determines the aggregation level of resource granularity for transmitting PDSCH according to the configuration information;

According to a third possible implementation manner of the seventh aspect, in a fourth possible implementation manner, the aggregation level includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

In a fifth possible implementation manner according to any one of the seventh aspect or the first to fourth possible implementation manners of the seventh aspect, the determining, by the base station, a frequency resource for transmitting the PDSCH includes:

the base station determines that a Resource Block (RB) for transmitting the PDSCH is a preset RB; or,

the base station sends a second signaling to the UE, wherein the second signaling comprises indication information for determining Resource Blocks (RBs) of a PDSCH, and the second signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to any one of the seventh aspect, the first to fourth possible implementation manners of the seventh aspect, in a sixth possible implementation manner, the determining, by the base station, a frequency resource of the PDSCH includes:

the base station determines that the bandwidth for transmitting the PDSCH is a preset bandwidth;

the base station sends a third signaling to the UE, wherein the third signaling comprises indication information for determining a first starting position of a frequency resource of a PDSCH, and the third signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to a fifth or sixth possible implementation manner of the seventh aspect, in a seventh possible implementation manner, the determining, by the base station, a frequency resource for transmitting the PDSCH further includes:

The base station sends fourth signaling to the UE, wherein the fourth signaling includes indication information for enabling the UE to determine a second starting position of a frequency resource for monitoring the PDSCH, and the fourth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In an eighth possible implementation manner of the seventh aspect, the determining, by the base station, a time domain resource for transmitting the PDSCH includes:

the base station determines that a time domain resource for transmitting the PDSCH is a preset first subframe; or,

and the base station sends fifth signaling to the UE, wherein the fifth signaling comprises indication information for determining a first subframe for transmitting the PDSCH.

In a ninth possible implementation manner of the eighth possible implementation manner of the seventh aspect, the indication information in the fifth signaling further includes a discontinuous reception period and a start subframe of the discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer and/or a time corresponding to an inactivity timer.

In a tenth possible implementation manner according to the ninth possible implementation manner of the seventh aspect, the first subframe for transmitting the PDSCH is a subframe within the active time.

In an eleventh possible implementation manner according to any one of the seventh aspect or the first to tenth possible implementation manners of the seventh aspect, after the base station sends the transport block to the UE on the time domain resource and the frequency resource according to the coding rate, the method further includes:

and the base station receives acknowledgement message ACK or non-acknowledgement message NACK sent by the UE.

In a twelfth possible implementation manner according to the eleventh possible implementation manner of the seventh aspect, when the base station does not receive the acknowledgement message ACK sent by the UE in a first preset time, the base station retransmits the transport block in a second preset time.

According to any one of the seventh aspect, the first to twelfth possible implementation manners of the seventh aspect, in a thirteenth possible implementation manner, the method further includes:

and the base station transmits a control channel and/or a PDSCH to the UE in a preset search space and/or a preset first time.

In a thirteenth possible implementation manner according to the seventh aspect, in a fourteenth possible implementation manner, when the base station transmits a control channel and a PDSCH in different first times, respectively, a time interval of the first time of transmitting the control channel is greater than or less than a time interval of the first time of transmitting the PDSCH.

In a thirteenth or fourteenth possible implementation manner of the seventh aspect, in a fifteenth possible implementation manner, when the base station sends a control channel and a PDSCH to the UE in a preset search space and/or a preset first time, the control channel or the PDSCH further includes preset first indication information, which is used for the UE to distinguish the control channel and the PDSCH.

In a sixteenth possible implementation form of the method according to any of the first to fifteenth possible implementation forms of the seventh aspect, the TBS is a subset of TBSs specified by the long term evolution, LTE, protocol.

According to any one of the seventh aspect, the first to sixteenth possible implementation manners of the seventh aspect, in a seventeenth possible implementation manner, the method further includes:

the base station determines that the PDSCH is in a listening mode according to a preset rule, or,

the base station sends a sixth signaling to the UE, where the sixth signaling includes indication information for determining that the PDSCH is in a listening mode, and the sixth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

According to any one of the seventh aspect, the first to seventeenth possible implementation manners of the seventh aspect, in an eighteenth possible implementation manner, the base station performs data transmission using the frequency resource for data transmission, including:

When the base station adopts a non-MBSFN subframe to transmit a Physical Downlink Shared Channel (PDSCH), the base station adopts an antenna port 0 or adopts a transmission diversity mode to transmit the PDSCH;

when the base station transmits the PDSCH by using the MBSFN subframe, the base station transmits the PDSCH by using an antenna port 7.

In an eighth aspect, an embodiment of the present invention provides a data transmission method, including:

the base station determines a range of frequency resources for downlink control information DCI indication;

the base station transmits the DCI to User Equipment (UE) so that the UE determines frequency resources for data transmission according to indication information in the DCI;

and the base station adopts the frequency resource for data transmission to carry out data transmission.

In a first possible implementation manner of the eighth aspect, the determining, by the base station, a range of frequency resources for DCI indication includes:

the base station adopts a preset first frequency resource as a range of the frequency resource for DCI indication; or,

the base station transmits seventh signaling to the UE, wherein the seventh signaling includes indication information for determining the range of the frequency resource for DCI indication, and the seventh signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

According to the eighth aspect or the first possible implementation manner of the eighth aspect, in a second possible implementation manner, the method further includes:

the base station transmits second DCI to the UE, wherein the second DCI comprises indication information for indicating the coding rate of the data.

According to a second possible implementation manner of the eighth aspect, in a third possible implementation manner, the coding rate indicated by the second DCI includes an aggregation level indicated by the DCI; or,

According to any one of the eighth aspect, the first to third possible implementation manners of the eighth aspect, in a fourth possible implementation manner, the method further includes:

the base station determines that the transport block size TBS of the transmission data is a preset TBS, or,

the base station sends eighth signaling to the UE, wherein the eighth signaling includes indication information for determining the TBS, and the eighth signaling includes at least one of the following: RRC signaling, MAC CE signaling, or DCI.

According to any one of the eighth aspect, the first to third possible implementation manners of the eighth aspect, in a fifth possible implementation manner, the method further includes:

The base station determines TBS under a specific modulation mode of the transmission data, wherein the specific modulation mode is determined through preset or signaling configuration;

and the base station transmits third DCI to the UE, wherein the third DCI comprises indication information for determining TBS under a specific modulation mode.

According to any one of the eighth aspect, the first to fifth possible implementation manners of the eighth aspect, in a sixth possible implementation manner:

when the system bandwidth is one of {1.4mhz,3mhz,5mhz,10mhz,15mhz,20mhz }, or one of {6rb,15rb,30rb,50rb,75rb,100rb }, the frequency range for DCI indication is smaller than the system bandwidth;

according to any one of the eighth aspect, the first to sixth possible implementation manners of the eighth aspect, in a seventh possible implementation manner, the method further includes:

and the base station sends a configuration message containing a second subframe to the UE, and the configuration message is used for indicating the UE to monitor a common control channel in the second subframe.

In a seventh possible implementation manner of the eighth aspect, in an eighth possible implementation manner, the period of the second subframe is an integer multiple of a discontinuous reception cycle DRX.

According to the data method, the device and the system provided by the embodiment of the invention, after the base station and the UE respectively determine the TBS (transport block size), the time domain resource and the frequency resource for transmitting the PDSCH and the PDSCH coding rate, the transport block is sent to the UE according to the coding rate on the time domain resource and the frequency resource, so that blind detection of the PDSCH can be realized, downlink data can be received without indication of DCI, and therefore, the control signaling overhead can be reduced, and the transmission efficiency of the system is improved.

According to the data method, the data device and the data system provided by the embodiment of the invention, the base station and the UE firstly determine the range of the frequency resource for indicating the DCI, namely firstly determine the maximum bandwidth which can be indicated by the DCI or the frequency domain resource corresponding to the maximum bandwidth, then determine the frequency resource for data transmission according to the indication information in the DCI, and perform data transmission through the frequency resource; because the maximum bandwidth or the frequency domain resource corresponding to the maximum bandwidth that can be indicated by the DCI is not the frequency domain resource corresponding to the system bandwidth or the system bandwidth, but is a smaller bandwidth or the frequency domain resource corresponding to the smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced, and the efficiency of system transmission is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic structural diagram of a UE according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a structure of a non-continuously received PDSCH transmission subframe;

fig. 3 is a schematic structural diagram of a UE embodiment ii of the present invention;

fig. 4 is a schematic structural diagram of a UE embodiment of the present invention;

fig. 5 is a schematic diagram of monitoring a control channel and/or PDSCH for a specific first time;

fig. 6 is a schematic structural diagram of a fourth embodiment of the UE according to the present invention;

fig. 7 is a schematic structural diagram of a UE embodiment five of the present invention;

fig. 8 is a schematic structural diagram of a base station according to a first embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second embodiment of a base station according to the present invention;

fig. 10 is a schematic structural diagram of a third embodiment of a base station according to the present invention;

fig. 11 is a schematic structural diagram of a UE embodiment six of the present invention;

fig. 12 is a schematic structural diagram of a UE embodiment seven of the present invention;

Fig. 13 is a schematic structural diagram of a fourth embodiment of a base station according to the present invention;

fig. 14 is a schematic structural diagram of a fifth embodiment of a base station according to the present invention;

fig. 15 is a flowchart of a data transmission method according to a first embodiment of the present invention;

fig. 16 is a flowchart of a second embodiment of a data transmission method according to the present invention;

fig. 17 is a signaling flow chart of a third embodiment of the data transmission method of the present invention;

FIG. 18 is a schematic diagram of resource granularity and aggregation level;

fig. 19 is a flowchart of a fourth embodiment of a data transmission method according to the present invention;

fig. 20 is a flowchart of a fifth embodiment of a data transmission method according to the present invention;

fig. 21 is a signaling flow chart of a sixth embodiment of the data transmission method of the present invention;

FIG. 22 is a schematic diagram of a first embodiment of the system of the present invention;

fig. 23 is a schematic structural diagram of a second embodiment of the system of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As used herein, "data" refers to traffic data such as transport blocks of the physical layer, which is distinguished from control signaling and other signaling or information used for indication such as downlink control channels or downlink control information at the physical layer. The embodiment of the invention aims at the problem of low transmission efficiency caused by overlarge signaling overhead in the small data transmission process, and the UE, the base station and the data transmission method provided by the embodiment of the invention can be used for reducing the DCI indication signaling overhead in the uplink or downlink transmission process.

The service data of the present invention is embodied in the physical layer as a transport block transmitted by a physical channel, which may be a data channel or a form using a control channel. Without loss of generality, the present invention is illustrated with transmission of a data channel PDSCH (also enhanced PDSCH).

The predefining in the embodiment of the invention can be factory setting or can be a mode agreed in advance between two communication parties, such as a base station and UE; the configuration in the embodiment of the invention can be configured through the base station, or can be configured for the base station and the UE respectively through other network maintenance tools, or can be set on the UE side according to the configuration information by receiving the configuration information of the base station.

For applications such as M2M (device-to-device, machine to Machine, which may also be understood broadly as device-to-person, machine-to-Man, person-to-device, man-to-Machine, machine-to-handset Machine to Mobile) applications, the traffic is relatively stable over a longer period of time, in that the physical layer (PHY) may be transmitting with a relatively fixed TBS over a period of time. The relatively fixed TBS may be predefined or configured. When a different TBS handover is required, a DCI signaling, such as DCI format 1A, may be used to perform TBS indication, for example, the current or post-handover TBS size may be indicated. When a UE acquires a data channel, such as a physical downlink shared channel (Physical Downlink Shared Channel, abbreviated PDSCH), the corresponding TBS may detect the PDSCH according to a predefined or configured aggregation level (aggregation level). The UE needs to blindly detect PDSCH when the location and/or aggregation level of PDSCH is not indicated. Thus, the UE needs to blindly detect PDSCH when the signaling does not indicate the location and or aggregation level of PDSCH. When the signaling indicates the position and aggregation level of the PDSCH, the UE may perform PDSCH detection according to the signaling indication, where the detection may be cyclic redundancy check (Cyclic Redundancy Check, abbreviated as CRC), and whether the PDSDH detection is successful is determined correctly according to the CRC check. The detection subframe of the UE in the time domain may be derived according to a predefined or configuration. The subframes of the time domain may be set according to a period of discontinuous reception DRX or an extended DRX.

Fig. 1 is a schematic structural diagram of a first embodiment of a UE according to the present invention, as shown in fig. 1, the UE in this embodiment may include: a determining module 101 and a receiving module 102, wherein,

a determining module 101, configured to determine a transport block size TBS;

the determining module 101 is further configured to determine a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

a receiving module 102, configured to receive the transport block on the time domain resource and the frequency resource.

The UE of the present embodiment may be used for blind PDSCH detection, or may perform detection according to an instruction of downlink control information (Downlink Control Information, abbreviated as DCI). When data on PDSCH is received only with blind detection, no indication of DCI is required.

When the UE receives the data on the PDSCH in a blind detection manner, it is preferable that the TBS of the data may be different from the existing DCI signaling in size, but the TBS of the data may also be applied in this manner when the size of the existing DCI signaling is the same, which is not limited by the embodiment of the present invention.

In the UE of this embodiment, after the determining module determines the size TBS of the transport block and the time domain resource and the frequency resource of the PDSCH, the receiving module receives the transport block on the time domain resource and the frequency resource, so blind detection on the PDSCH can be implemented, and downlink data can be received without the indication of DCI, so control signaling overhead can be reduced, and the transmission efficiency of the system can be improved.

The information required for performing or configuring the PDSCH blind detection is: the TBS, the frequency domain resource, and the time domain resource are described in detail below with respect to the information to be determined, respectively.

Optionally, when determining the TBS of the data, the TBS of the UE in the foregoing embodiment may be preset, or may be determined according to a manner signaled by the base station, and accordingly, the determining module 101 may specifically be configured to: determining the size of the transmission block as a preset TBS; or,

Wherein the predefined TBSs may be 1 or more TBSs that may be a subset of an existing TBS table or a newly added TBS. When multiple TBSs are predefined, the base station may instruct the UE with signaling which TBS to use for blind detection.

When the TBS limit is 1000 bits or less, the TBS listed in the following table can be used for multiplexing the existing TBS value:

16	24	32	40	56	72	88	104	120	136
										144	152	176	208	224	256	280	296	328	336
344	376	392	408	440	456	472	488	504	520
										536	552	584	600	616	632	696	712	776	808
840	872	904	936	968	1000

typically, a traffic-stable UE, such as an MTC UE, has a relatively fixed TBS for a relatively long period of time. Thus, the base station can notify the TBS for the period of time through the first signaling, and notify the new TBS through the first signaling when the TBS changes. For this purpose a limited number of TBS values may be predefined and then a first signaling is used to inform which TBS value is currently employed. The limited number of TBS values defined may be a subset of an existing TBS table, e.g., {208, 600, 872, 1000}. The first signaling used may be RRC signaling or DCI format or MAC CE or any combination between them. For example, the base station may indicate using RRC signaling while indicating PDSCH carrying the RRC signaling using a DCI format such as format 1A.

Further, the determining module 101 may be further configured to:

determining a coding rate of transmitting the PDSCH;

the receiving module 102 may be specifically configured to receive, on the time domain resource and the frequency resource, the transport block according to the coding rate of the PDSCH.

Wherein, the coding rate of the PDSCH may include an aggregation level of resource granularity of the PDSCH.

Thus, for the determination of the coding rate, the determining module 101 may be specifically configured to:

an aggregation level of a granularity of resources transmitting the PDSCH is determined.

This is because PDSCH is transmitted by an aggregation of resource granularity consisting of one or a set of identical resource granularity units. Aggregation of resource granularity is represented by an aggregation level, and if the aggregation level is 1, PDSCH is transmitted by 1 resource granularity; aggregation level is 2, PDSCH is transmitted by 2 resource granularity.

Further, the determining module 101 may specifically be configured to:

Wherein the resource granularity comprises any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

Alternatively, for the determination of frequency domain resources, there may be two ways:

in a first implementation, the frequency domain resources may be indicated by Resource Blocks (RBs) or may be indicated by physical resource blocks PRB (Physical Resource Block) or virtual resource blocks VRB (Virtual Resource Block). Hereinafter, RB is described as an example. The determining module 101 may specifically be configured to:

In a second implementation, the frequency domain resources are indicated by means of bandwidths and starting positions, which is especially applicable to scenarios where the frequency domain resources are contiguous resources. The determining module 101 may specifically be configured to:

Further, in the two implementations, the determining module 101 may determine a larger frequency domain resource range, and in a specific implementation, the UE may determine a smaller range within the larger frequency domain resource range for detection. Thus, the determination module 101 may in particular also be used for:

For example, the UE first receives a large frequency resource range according to the first approach, such as: the RBs numbered 6,7,8,9, 10, 11, 12, 13 then determine a second starting position according to a fourth signaling or hash function, perform blind detection starting from the second starting position, and if the second starting position is determined to be RB 7, the UE may detect from RB 7 up to RB 13.

Alternatively, for the time domain resource transmitting the PDSCH, it may be determined by signaling or by a predefined manner, so the determining module 101 may be specifically configured to:

and determining the subframe of the PDSCH as a preset first subframe.

In particular implementations, discontinuous reception times (Discontinuous Reception, abbreviated DRX) may be configured for transmission of PDSCH. Fig. 2 is a schematic diagram of a structure of a non-continuously received PDSCH transmission subframe, and as shown in fig. 2, the UE performs PDSCH detection over several non-continuous time intervals. In fig. 2, the UE performs blind detection of PDSCH at the active time (On duration) of each DRX cycle. Accordingly, the indication information in the fifth signaling may further include a discontinuous reception period, a start subframe of discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer (on duration timer) and/or a time corresponding to an inactivity timer (inactivity timer).

Further, the indication information in the fifth signaling may further indicate: the first subframe for transmitting PDSCH is a subframe within the active time.

Fig. 3 is a schematic structural diagram of a second embodiment of a UE according to the present invention, as shown in fig. 3, the UE in this embodiment may further include: a transmitting module 103, where the transmitting module 103 may be configured to send an acknowledgement message ACK to a base station after the receiving module correctly receives the PDSCH; or after the determining module determines that the PDSCH cannot be received, sending a non-acknowledgement message NACK to the base station.

In this way, when the base station receives NACK or when the time when ACK is not received exceeds a certain threshold, the base station may determine that the UE did not successfully receive the PDSCH, and thus, may retransmit. The UE may combine the PDSCH (or the repeatedly transmitted transport block) repeatedly received after transmitting the NACK within a preset or configured time. The repeated PDSCH (or repeatedly transmitted transport block) or the new PDSCH (or newly transmitted transport block) may be distinguished by a scrambling code scrambled at the CRC. The scrambling code may be preset or configured by the base station. Or the coverage enhancement mode can be started, for example, the continuous p subframes can be configured to transmit the same PDSCH, p is an integer to accumulate energy for coverage enhancement, and the UE can detect the PDSCH according to the continuous p subframes according to the configuration to improve the success rate of data reception.

Fig. 4 is a schematic structural diagram of a third embodiment of a UE according to the present invention, as shown in fig. 4, where the UE in this embodiment may further include: and the monitoring module 104 is configured to monitor the control channel and/or PDSCH in the search space configured by the base station and/or the first time configured by the base station. Wherein the control channel includes a PDCCH or an E-PDDCH.

The UE of this embodiment may monitor only the control channel, only the PDSCH, or both the control channel and the PDSCH for a dedicated search space or some first time of the UE (or both the search space and the first time). The corresponding transmission modes can include the following: transmitting only the control channel in the UE's dedicated search space (without limitation on time); transmitting only PDSCH in UE's dedicated search space (without limitation on time); transmitting the control channel and PDSCH simultaneously in the UE's dedicated search space (without time limitation); only transmitting PDSCH in a certain first time (without limiting the frequency domain); only transmitting PDSCH in a certain first time (without limiting the frequency domain); simultaneously transmitting a control channel and a PDSCH at a certain first time (without limiting a frequency domain); transmitting only PDSCH in the UE's dedicated search space and for a certain first time period; transmitting only control channels in a dedicated search space of the UE and for a certain first time period; PDSCH and control channel are transmitted simultaneously in the UE's dedicated search space and for some first period of time. Wherein the first time may be a predefined or configured period of time such as a subframe or subframes at the beginning of a discontinuous reception time period. Fig. 5 is a schematic diagram illustrating the control channel and/or PDSCH being monitored during a specific first time, and as shown in fig. 5, the control channel and PDSCH are sometimes monitored during the same time, and sometimes not monitored during the same time.

The search space may be configured or preset by the base station, and the first time may be configured or preset by the base station.

When the control channel and the PDSCH are not transmitted in the same first time, the blind detection times can be reduced, and the power consumption of the UE is saved.

Further, it is also possible to define: when the listening module 104 listens to the control channel and PDSCH in different first times, respectively, the time interval or period of the first time of listening to the control channel is greater than or less than the time interval or period of the first time of listening to the PDSCH. If the time interval or period of the first time of the monitoring control channel is larger than the time interval or period of the first time of the monitoring PDSCH, the signaling overhead is saved; if the time interval or period of the first time of the listening control channel is smaller than the time interval or period of the first time of the listening PDSCH, the fast switch to the signaling scheduling mode is beneficial to perform other TBS switch or Hybrid-ARQ (HARQ) or coverage enhancement transmission mode, etc.

Further, in one implementation, the listening module 104 may specifically be configured to: when monitoring the control channel and the PDSCH in the search space configured by the base station and/or the time configured by the base station, the control channel and the PDSCH are distinguished by the size TBS of the transmission block, or the control channel and the PDSCH are distinguished according to at least one of the granularity of resources, the time domain position and the frequency domain position, or the control channel and the PDSCH are distinguished according to the preset first indication information.

When the transport block size is different from the signaling size of the existing control channel, it is possible to directly distinguish whether it is PDSCH or control channel through TBS. The DCI format used in the DCI carried by the control channel may be a subset or all of the existing DCI formats. For example, it may be predefined that only DCI format 1A is adopted, and that the transport block sizes with the tbs value not equal to the size of DCI format 1A are all considered PDSCH in transmission.

When the transport block size is the same as the existing DCI format size, the distinction can be made by using different resource granularity from the DCI format for aggregation or different time-frequency resource locations or explicit indications.

In another implementation manner, the listening module 104 may distinguish the downlink control information DCI from the PDSCH according to the scrambling code scrambled by the cyclic redundancy check CRC or distinguish the control channel from the PDSCH according to the first indication information in the newly added indication bit or the original bit in the DCI.

This approach, with explicit indication, can be applied to scenarios where PDSCH and DCI format have the same TBS and the same aggregate resource granularity.

Specifically, a CRC-scrambled scrambling code may be used to distinguish PDSCH from DCI format. The scrambling code is predefined or configured, e.g. a 16-bit scrambling code may comprise <1，1，1，1，1，1，1，1，1，1，1，1，1，1，1，1>Or (b)<0，1，0，1，0，1，0，1，0，1，0，1，0，1，0，1>. Wherein the scrambling code and CRC check code and RNTI (Radio Network Temporary Identifier ) are added bit by bit and then subjected to modulo two operation. For example, the scrambling sequence is { R ₀ ，R ₁ ，R ₂ ，…，R _L-1 CRC sequence { P } ₀ ，P ₁ ，P ₂ ，…，P _L-1 RNTI sequence of { X } ₀ ，X ₁ ，X ₂ ，…，X _L-1 The 3 sequences can be added bit by bit and then subjected to modulo-two operation, and the obtained new sequence (namely the sequence after scrambling) is:

C _k ＝(P _k +X _k +R _k )mod2，k＝0，…，L-1

in addition, when the TBS is smaller than the DCI format size, it may be made the same as the existing DCI format size by supplementing 0 after the bits of the TBS. At this time, the CRC-scrambled scrambling code is used to distinguish PDSCH from DCI format. For example, a 16-bit scrambling code may contain <1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1> or <0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1>. Wherein the scrambling code and the CRC check code are added modulo two. Alternatively, a different scrambling code may be used to indicate the TBS of the PDSCH or a fixed number of bits may be added before or after the transport block bits to indicate the TBS of the PDSCH.

Further, in the above embodiments, the determining module 101 may be further configured to:

determining the modulation mode of the PDSCH according to a preset rule, or,

receiving a ninth signaling sent by a base station, and determining a modulation mode of the PDSCH according to indication information in the ninth signaling, wherein the ninth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

The preset rule may be at least one of: channel quality range, signal-to-noise ratio range, bit error rate threshold, packet error rate threshold, spectral efficiency threshold.

The modulation mode may include any one of the following: gaussian minimum shift keying (Gaussian minimum shift keying, abbreviated as GMSK), quadrature phase shift keying (QuadriPhase Shift Keying, abbreviated as QPSK), 16 phase quadrature amplitude modulation (16 Quadrature Amplitude Modulation, abbreviated as 16 QAM), 64 phase quadrature amplitude modulation (64 Quadrature Amplitude Modulation, abbreviated as 64 QAM).

In each UE embodiment described above, the TBS may be a subset of TBSs specified by the long term evolution LTE protocol; the first signaling, the second signaling, the third signaling, the fourth signaling, the fifth signaling, the sixth signaling, and the ninth signaling in the above embodiments may be the same signaling, that is, the same signaling may include the indication information in the above multiple signaling.

The UE described in the above embodiments (embodiments corresponding to fig. 1, 3, and 4) of each UE may execute the technical solution corresponding to the method embodiment shown in fig. 15 or the method executed by the corresponding UE in the embodiment shown in fig. 17.

Fig. 6 is a schematic structural diagram of a fourth embodiment of a UE according to the present invention, where the UE in the present embodiment reduces control signaling overhead by changing the content of downlink control information DCI. As shown in fig. 6, the UE of the present embodiment may include: a determination module 601 and a data transmission module 602, wherein,

a determining module 601, configured to determine a range of frequency resources for DCI indication;

the determining module 601 may be further configured to determine a frequency resource for data transmission according to the indication information in the DCI;

the data transmission module 602 may be configured to transmit data on the frequency resource used for data transmission.

The data transmission module may be configured to receive downlink data sent by the base station, and may also be configured to send uplink data to the base station.

Aiming at the problem that the resource indication overhead is overlarge because the whole system bandwidth is covered by the existing DCI under different system bandwidths, the maximum bandwidth which can be indicated by the DCI is reduced, so that bits of DCI formats are reduced. For this purpose, the maximum bandwidth that can be supported by the DCI format or the frequency resource corresponding to the maximum bandwidth may be preset or configured, for example, the bandwidth corresponding to 6 RBs. In addition to presetting or configuring the maximum bandwidth supported by the DCI, a frequency domain resource location corresponding to the maximum bandwidth supported by the DCI may be preset or configured, for example, an RB location is determined, and when the frequency domain resource location is configured, a resource allocation type of LTE may be used, for example, type 0 or type 1 or type 2 may be used for indication. Wherein resource allocation type 2 supports both centralized and distributed resource allocation. Wherein, the resource allocation type 0 of LTE divides continuous RBs into groups, and each group uses 1bit to indicate whether to use or not; the resource allocation type 1 of LTE is that discrete RBs are divided into a plurality of sets, whether the sets are used or not is indicated firstly, and then whether the RBs in the sets are used or not is indicated; the resource allocation type 2 of LTE indicates a start position and a length of a continuous band of frequency domain resources and supports one RB located in 2 slots, respectively, to be located in the same frequency or different frequencies.

The frequency resource range used for DCI indication is smaller than the current system bandwidth, and the system bandwidth is one of {1.4MHz,3MHz,5MHz,10MHz,15MHz and 20MHz } or one of {6RB,15RB,30RB,50RB,75RB and 100RB }.

The UE of this embodiment determines a range of frequency resources for DCI indication, that is, first determines a maximum bandwidth that the DCI can indicate or a frequency resource corresponding to the maximum bandwidth, then determines a frequency resource for data transmission according to indication information in the DCI, and performs data transmission through the frequency resource; because the maximum bandwidth or the frequency domain resource corresponding to the maximum bandwidth that can be indicated by the DCI is not the frequency domain resource corresponding to the system bandwidth or the system bandwidth, but is a smaller bandwidth or the frequency domain resource corresponding to the smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced, and the efficiency of system transmission is improved.

In the above embodiment, the range of the frequency resource for DCI indication may be determined by a preset or signaling manner, and therefore, the determining module 601 may specifically be configured to:

Fig. 7 is a schematic structural diagram of a fifth embodiment of the UE according to the present invention, as shown in fig. 7, the UE in this embodiment may further include:

a receiving module 603, configured to receive a second DCI sent by the base station, where the DCI indicates a coding rate of the data.

The coding rate may be a coding rate defined in a modulation and coding scheme (Modulation and Coding Scheme, abbreviated MCS) or an aggregation level of resource granularity of a transmission PDSCH.

Optionally, the determining module 601 may be further configured to:

In this way, the indication bits of the MCS may be further reduced, thereby further reducing the overhead of control signaling.

Specifically, in one mode, the preset modulation mode may be one of QPSK, 16QAM, and 64 QAM. The modulation and coding scheme MCS or coding rate of the data in the modulation scheme is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

In another manner, the modulation manner of the configurable data may be one of QPSK, 16QAM, and 64QAM, and the configuration signaling may be RRC signaling or MAC CE signaling. The modulation and coding scheme MCS or coding rate of the data in the modulation scheme is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

For example, for PDSCH, when the modulation scheme of data is defined as QPSK, the modulation coding scheme or MCS index or TBS index or coding rate under the existing modulation scheme of LTE is multiplexed, and the MCS indication bits only need to indicate indexes 0 to 9 of the existing MCS, that is, only 4 bits are needed to indicate the 10 states; when the bit is limited to 16QAM, multiplexing the existing coding rate under the modulation mode of LTE, wherein the MCS indication bit only needs to indicate the existing MCS index of 10-16, namely 3 bits can indicate the 7 states; when the modulation scheme is defined as 64QAM, the coding rate of the existing modulation scheme of LTE is multiplexed, and the MCS indication bits only need to indicate the existing MCS indexes 17-28, namely 4 bits can indicate the 12 states.

For PUSCH, when the modulation scheme of data is defined as QPSK, multiplexing the modulation coding scheme or MCS index or TBS index or coding rate under the existing modulation scheme of LTE, where the MCS indication bits only need to indicate the indexes 0 to 10 of the existing MCS, that is, only 4 bits are needed to indicate the 11 states; when the modulation method is limited to 16QAM, multiplexing the coding rate of the LTE under the existing modulation mode, wherein the MCS indication bit only needs to indicate the existing MCS index of 11-20, namely 4 bits can indicate the 10 states; when the modulation scheme is defined as 64QAM, the existing coding rate of LTE is multiplexed, and the MCS indication bits thereof only need to indicate the existing MCS indexes 21 to 28, i.e., 3 bits may indicate the 8 states.

Optionally, the receiving module 603 may further be configured to:

receiving a second subframe configured by the base station;

the determining module 601 may be further configured to determine to monitor a common control channel in the second subframe, that is, not monitor a dedicated control channel of the UE in the second subframe.

Wherein the common control channel includes: control channels carrying system messages, random access responses, paging, power control.

In a specific implementation, the period of the second subframe may be an integer multiple of a discontinuous reception period DRX.

The seventh signaling and the eighth signaling in the above embodiments may be the same signaling, that is, the same signaling may include the indication information in the plurality of signaling; but may also be different signaling.

The UE described in the above embodiments (embodiments corresponding to fig. 6 and fig. 7) of each UE may perform the technical solution of the method embodiment shown in fig. 19 or the method performed by the corresponding UE in fig. 21.

Fig. 8 is a schematic structural diagram of a first embodiment of a base station according to the present invention, in which a blind detection manner is adopted to reduce control signaling overhead. As shown in fig. 8, the base station of the present embodiment may include: a determination module 801, and a transmission module 802, wherein,

a determining module 801, configured to determine a transport block size TBS to be sent;

the determining module 801 is further configured to determine a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

a sending module 802, configured to send the transport block to the user equipment UE on the time domain resource and the frequency resource.

The base station of the embodiment may be used in a scheme for blind detection of PDSCH on the UE side, and of course, the base station may also transmit DCI simultaneously, so that the UE detects according to the DCI indication. When the UE receives data on the PDSCH only by blind detection, no DCI needs to be transmitted, and this method is preferably applicable to a scenario where the TBS of the data may be different from the size of the existing DCI signaling, but this method may also be applied when the TBS of the data is the same as the size of the existing DCI signaling, which is not limited by the embodiment of the present invention.

In the base station of this embodiment, after the determining module determines the size TBS of the transport block and the time domain resource and the frequency resource of the PDSCH, the transmitting module transmits the transport block to the UE on the time domain resource and the frequency resource, so that the UE can implement blind detection on the PDSCH, and thus can receive downlink data without the indication of DCI, and therefore, control signaling overhead can be reduced, and thus, the transmission efficiency of the system is improved.

When the scheme of blind detection of PDSCH is adopted, the required information is: TBS, frequency domain resources, time domain resources, respectively, will be described below with respect to the above information to be configured.

For the determination of the TBS, a preset manner may be adopted, or may be determined according to a signaling manner of the base station, and accordingly, the determining module 801 may specifically be configured to:

determining the size of the transmission block as a preset TBS; or,

Alternatively, in one embodiment, the base station may also determine the coding rate of the PDSCH first, and transmit data according to the coding rate. In particular, the determining module 801 may also be configured to determine a coding rate at which the PDSCH is transmitted;

the sending module 802 may be specifically configured to send the transport block to the UE according to the coding rate on the time domain resource and the frequency resource.

The determining module 801 may be specifically configured to:

an aggregation level of resource granularity of the transmitted PDSCH is determined.

Further, the determining module 801 may specifically be configured to:

Wherein the aggregation level includes any one of the following resource granularities or a multiple of any one of the following resource granularities: CCE, ECCE, REG, EREG, PRB, VRB.

in a first implementation, the frequency domain resources are indicated by resource blocks RB, and the determining module 801 may specifically be configured to:

Note that, the frequency resource may be indicated by PRBs or VRBs, and the indication of the resource block by RBs in the present invention is only an example.

In a second implementation, the frequency domain resources are indicated by means of bandwidths and starting positions, which is especially applicable to scenarios where the frequency domain resources are contiguous resources. The determining module 801 may specifically be configured to:

determining the bandwidth for transmitting the PDSCH as a preset bandwidth;

Further, in the above two implementations, the determining module 801 may determine a larger frequency domain resource range, and in a specific implementation, may further enable the UE to determine a smaller range within the larger frequency domain resource range for detection. Thus, the determination module 801 may also be used in particular for:

For example, the base station may first send a larger frequency resource range to the UE according to the first manner, for example: the RB numbered 6,7,8,9, 10, 11, 12, 13 then sends a fourth signaling to enable the UE to determine the second starting position according to the indication information in the fourth signaling, or does not send the fourth signaling to enable the UE to determine the second starting position according to the hash function, blind detection is performed from the second starting position, and if the second starting position is determined to be RB 7, the UE can start detection from RB 7 up to RB 13.

Alternatively, for the time domain resource for transmitting the PDSCH, it may be determined by signaling or by a predefined manner, so the determining module 801 may be specifically configured to:

In particular implementations, discontinuous reception times (Discontinuous Reception, abbreviated DRX) may be configured for transmission of PDSCH. The ue may perform PDSCH detection over several non-consecutive time intervals, see fig. 2. In fig. 2, the UE performs blind detection of PDSCH at the active time (On duration) of each DRX cycle. Accordingly, the indication information in the fifth signaling may further include a discontinuous reception period, a start subframe of discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer (on duration timer) and/or a time corresponding to an inactivity timer (inactivity timer).

Fig. 9 is a schematic structural diagram of a second embodiment of a base station according to the present invention, as shown in fig. 9, the base station according to the present embodiment may further include: a receiving module 803, where the receiving module 803 may be configured to receive an acknowledgement message ACK or a non-acknowledgement message NACK sent by the UE.

And when the base station does not receive the acknowledgement message ACK sent by the UE in the first preset time, the base station retransmits the transport block in the second preset time.

And when the base station receives NACK or the base station does not receive Acknowledgement (ACK) sent by the UE within a first preset time, the base station retransmits the transmission block within a second preset time. The base station can distinguish between the repeated PDSCH (or repeated transport block) or the newly transmitted PDSCH (or newly transmitted transport block) by scrambling the CRC. The scrambling code may be preset or configured by the base station. And the base station can also start a coverage enhancement mode, for example, the base station can configure p continuous subframes to send the same PDSCH, p is an integer to accumulate energy for coverage enhancement, and the UE can detect the PDSCH according to the p continuous subframes according to the configuration to improve the success rate of data reception.

Further alternatively, the sending module 802 may be further configured to:

and sending a control channel and/or a PDSCH to the UE in a preset search space and/or a preset first time. Wherein the control channels include a PDDCH and an E-PDDCH.

The base station of this embodiment may send only the control channel to the UE, only the PDSCH to the UE, or both the control channel and the PDSCH to the UE during the dedicated search space of the UE or a certain first time (or both the designated search space and the first time). The corresponding transmission modes can include the following: transmitting only the control channel in the UE's dedicated search space (without limitation on time); transmitting only PDSCH in UE's dedicated search space (without limitation on time); transmitting the control channel and PDSCH simultaneously in the UE's dedicated search space (without time limitation); only transmitting PDSCH in a certain first time (without limiting the frequency domain); only transmitting PDSCH in a certain first time (without limiting the frequency domain); simultaneously transmitting a control channel and a PDSCH at a certain first time (without limiting a frequency domain); transmitting only PDSCH in the UE's dedicated search space and for a certain first time period; transmitting only control channels in a dedicated search space of the UE and for a certain first time period; PDSCH and control channel are transmitted simultaneously in the UE's dedicated search space and for some first period of time. Wherein the first time may be a predefined or configured period of time such as a subframe or subframes at the beginning of a discontinuous reception time period. As shown in fig. 5, the control channel and PDSCH may be monitored at the same time, and may not be monitored at the same time.

Further, it is also possible to define: when the transmission module transmits a control channel and a PDSCH in different first times respectively, a time interval or period of the first time of transmitting the control channel is greater than or less than a time interval or period of the first time of transmitting the PDSCH. When the time interval or period of the first time of transmitting the control channel is larger than the time interval or period of the first time of transmitting the PDSCH, the signaling overhead is saved; when the time interval or period of the first time of transmitting the control channel is smaller than the time interval or period of the first time of transmitting the PDSCH, the method is favorable for quickly switching to a signaling scheduling mode to perform other TBS switching or HARQ or coverage enhancement transmission mode and the like.

Further, in one implementation, when the sending module 802 sends a control channel and a PDSCH to the UE in a preset search space and/or a preset first time, the control channel or the PDSCH further includes preset first indication information, which is used for the UE to distinguish the control channel and the PDSCH.

In the scenario that the PDSCH and the DCI format have the same TBS and the same granularity of aggregate resources, the method in the implementation manner described above, that is, explicit indication information, may be adopted, so that the UE distinguishes the control channel and the PDSCH.

Specifically, a CRC-scrambled scrambling code may be used to distinguish PDSCH from control channels. The scrambling code is predefined or configured, e.g., a 16-bit scrambling code may contain <1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1> or <0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1>. Wherein the scrambling code and the CRC code are modulo two operated.

Further, in the foregoing embodiments, the determining module 801 may be further configured to:

Optionally, the sending module 802 is specifically configured to:

when a physical downlink shared channel PDSCH is transmitted by adopting a non-multimedia broadcast multicast service single frequency network (Multimedia Broadcast multicast service Single Frequency Network, simply called MBSFN) subframe, transmitting the PDSCH by adopting an antenna port 0 or adopting a transmission diversity mode;

Further, in the above-described base station embodiments, the determining module 801 may be further configured to:

determining the modulation mode of the PDSCH according to a preset rule, or,

transmitting a ninth signaling to the UE, so that the UE determines a modulation mode of the PDSCH according to the indication information in the ninth signaling, where the ninth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

The preset rule may be at least one of: channel quality range, signal-to-noise ratio range, bit error rate threshold, packet error rate threshold, and spectrum efficiency threshold.

The modulation mode may include any one of the following: GMSK, QPSK, 16QAM, 64QAM.

In the above base station embodiment, the TBS may be a subset of TBSs specified by a long term evolution LTE protocol; the first signaling, the second signaling, the third signaling, the fourth signaling, the fifth signaling, the sixth signaling, and the ninth signaling in the above embodiments may be the same signaling, that is, the same signaling may include the indication information in the above multiple signaling.

The base station described in the above embodiments of each base station (embodiments corresponding to fig. 8 and fig. 9) may perform the technical solution of the method embodiment shown in fig. 16 or the method performed by the corresponding base station in fig. 17.

Fig. 10 is a schematic structural diagram of a third embodiment of a base station according to the present invention, in which control signaling overhead is reduced by changing the content of DCI indication information. As shown in fig. 10, the base station of the present embodiment may include: a determination module 1001, a transmission module 1002, and a data transmission module 1003, wherein,

a determining module 1001, configured to determine a range of frequency resources indicated by downlink control information DCI;

a sending module 1002, configured to send the DCI to a UE, so that the UE determines a frequency resource for data transmission according to indication information in the DCI;

the data transmission module 1003 may be configured to perform data transmission using the frequency resource for data transmission.

The data transmission module may be configured to receive uplink data sent by the UE, and may also be configured to send downlink data to the UE.

Aiming at the problem that the resource indication overhead is overlarge because the whole system bandwidth is covered by the existing DCI under different system bandwidths, the maximum bandwidth which can be indicated by the DCI is reduced, so that bits of DCI formats are reduced. For this purpose, the maximum bandwidth that can be supported by the DCI format or the frequency domain resource corresponding to the maximum bandwidth may be preset or configured, for example, the bandwidth corresponding to 6 RBs. In addition to presetting or configuring the maximum bandwidth supported by the DCI or the frequency domain resource corresponding to the maximum bandwidth, a frequency domain resource location corresponding to the maximum bandwidth supported by the DCI may be preset or configured, for example, an RB location is determined, and when configuring the frequency domain resource location, a resource allocation type of LTE, such as type 0 or type 1 or type 2, may be used for indication. Wherein resource allocation type 2 supports both centralized and distributed resource allocation. Wherein, the resource allocation type 0 of LTE divides continuous RBs into groups, and each group uses 1bit to indicate whether to use or not; the resource allocation type 1 of LTE is that discrete RBs are divided into a plurality of sets, whether the sets are used or not is indicated firstly, and then whether the RBs in the sets are used or not is indicated; the resource allocation type 2 of LTE indicates a start position and a length of a continuous band of frequency domain resources and supports one RB located in 2 slots, respectively, to be located in the same frequency or different frequencies.

Wherein, the frequency resource range used for DCI indication is smaller than the system bandwidth, and the system bandwidth is one of {1.4MHz,3MHz,5MHz,10MHz,15MHz,20MHz } or one of {6RB,15RB,30RB,50RB,75RB,100RB }.

The base station of the embodiment firstly determines the range of the frequency resource for indicating the DCI, namely firstly determines the maximum bandwidth which can be indicated by the DCI or the frequency resource corresponding to the maximum bandwidth, then determines the frequency resource for data transmission according to the indication information in the DCI, and performs data transmission through the frequency resource; since the maximum bandwidth that the DCI can indicate is not the system bandwidth but a smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced and the efficiency of system transmission can be improved.

In the above embodiment, the range of the frequency resource used for DCI indication may be determined by a preset or signaling manner, and therefore, the determining module 1001 may specifically be configured to:

Further alternatively, the sending module 1002 may be further configured to:

Optionally, the determining module 1001 is further configured to:

Optionally, the determining module 1001 may further be configured to:

Specifically, in one mode, the preset modulation mode may be one of QPSK, 16QAM, and 64 QAM. The modulation and coding scheme of the data in the modulation mode is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

In another manner, the modulation manner of the configurable data may be one of QPSK, 16QAM, and 64QAM, and the configuration signaling may be RRC signaling or MAC CE signaling. The modulation and coding scheme of the data in the modulation mode is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

Optionally, the sending module 1002 may be further configured to:

and sending a configuration message containing a second subframe to the UE, wherein the configuration message is used for indicating the UE to monitor a common control channel in the second subframe, namely indicating the UE not to monitor a special control channel of the UE in the second subframe.

In a specific implementation, the period of the second subframe is an integer multiple of the discontinuous reception period DRX.

The base station described in the above embodiments of each base station (the embodiment corresponding to fig. 10) may execute the technical solution of the method embodiment shown in fig. 20 or the method executed by the corresponding base station in fig. 21.

Fig. 11 is a schematic structural diagram of a UE embodiment of the present invention, where the UE in the present embodiment may receive data in a blind detection manner, so as to reduce control signaling overhead. As shown in fig. 11, the UE 1100 of the present embodiment may include: also shown are a receiver 1101, a transmitter 1102, and a processor 1103, a memory 1104 and a bus 1105, the receiver 1101, the transmitter 1102, the processor 1103, and the memory 1104 being coupled by the bus 1105 and completing communication with each other.

The bus 1105 may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus 1105 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.

Memory 1104 is used to store executable program code that includes computer operating instructions. The memory 1104 may include high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 1103 may be a central processing unit (Central Processing Unit, CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

Wherein, the processor 1103 is configured to determine a transport block size TBS;

the processor 1103 is further configured to determine a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

a receiver 1101, configured to receive the transport block on the time domain resource and the frequency resource.

Optionally, the processor 1103 is specifically configured to: determining the size of the transmission block as a preset TBS; or,

Optionally, the processor 1103 is further configured to:

determining a coding rate of transmitting the PDSCH;

the receiver 1101 is specifically configured to receive, on the time domain resource and the frequency resource, the transport block according to the coding rate of the PDSCH.

Optionally, the coding rate of the PDSCH includes an aggregation level of resource granularity of the PDSCH;

the processor 1103 is specifically configured to:

Optionally, the resource granularity includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

Optionally, the processor 1103 is specifically configured to:

the indication receiver 1101 receives a third signaling sent by a base station, and determines a first starting position of a frequency resource of the PDSCH according to indication information in the third signaling, where the third signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the processor 1103 is specifically configured to:

the instruction receiver 1101 receives a fourth signaling sent by a base station, and determines a second starting position of a frequency resource for monitoring the PDSCH according to the instruction information in the fourth signaling, where the fourth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling; or,

Optionally, the processor 1103 is specifically configured to:

the indication receiver 1101 receives a fifth signaling sent by the base station, and determines, according to indication information in the fifth signaling, that a time domain resource for transmitting the PDSCH is a first subframe, where the fifth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling; or,

And determining the subframe of the PDSCH as a preset first subframe.

Optionally, the indication information in the fifth signaling further includes a discontinuous reception period, a start subframe of the discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer (on duration timer) and/or a time corresponding to an inactivity timer (inactivity timer).

Optionally, the first subframe for transmitting PDSCH is a subframe within the active time.

Optionally, the transmitter 1102 is configured to send an acknowledgement message ACK to a base station after the receiver 1101 correctly receives the PDSCH; or, after the processor 1103 determines that the PDSCH cannot be received, it sends a non-acknowledgement message NACK to the base station.

Optionally, the receiver 1101 is further configured to:

and monitoring a control channel and/or a PDSCH in the search space configured by the base station and/or the first time configured by the base station.

Optionally, when the receiver 1101 listens to the control channel and the PDSCH respectively in different first times, the time interval of the first time of listening to the control channel is greater than or less than the time interval of the first time of listening to the PDSCH.

Optionally, the receiver 1101 is specifically configured to: when monitoring the control channel and the PDSCH in the search space configured by the base station and/or the time configured by the base station, the control channel and the PDSCH are distinguished by the size TBS of the transmission block, or the control channel and the PDSCH are distinguished according to at least one of the granularity of resources, the time domain position and the frequency domain position, or the control channel and the PDSCH are distinguished according to the preset first indication information.

Optionally, the receiver 1101 is specifically configured to:

Optionally, the TBSs are a subset of TBSs specified by the long term evolution, LTE, protocol.

Optionally, the processor 1103 is further configured to:

In this embodiment, the TBS may be a subset of TBSs specified by the long term evolution LTE protocol; the first signaling, the second signaling, the third signaling, the fourth signaling, the fifth signaling, the sixth signaling, and the ninth signaling in the above embodiments may be the same signaling, that is, the same signaling may include the indication information in the plurality of signaling.

The UE in this embodiment may perform the method performed by the corresponding UE in fig. 15 or 17.

In the UE of this embodiment, after the processor determines the transport block size TBS and the time domain resource and the frequency resource for transmitting the PDSCH, the receiver receives the transport block on the time domain resource and the frequency resource, so that blind detection on the PDSCH can be implemented, downlink data can be received without the indication of DCI, and therefore control signaling overhead can be reduced, and the transmission efficiency of the system is improved.

Fig. 12 is a schematic structural diagram of a UE embodiment seven of the present invention, where the UE of the present embodiment may reduce control signaling overhead by changing the content of DCI. As shown in fig. 12, the UE 1200 of the present embodiment may include: also shown are a receiver 1201, a transmitter 1202 and a processor 1203, a memory 1204 and a bus 1205, the receiver 1201, the transmitter 1202, the processor 1203, the memory 1204 being connected by the bus 1205 and completing communication with each other.

The bus 1205 may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus 1205 may be divided into address bus, data bus, control bus, and the like. For ease of illustration, only one thick line is shown in fig. 12, but not only one bus or one type of bus.

Memory 1204 is used to store executable program code, which includes computer operating instructions. The memory 1204 may include high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 1203 may be a central processor (Central Processing Unit, CPU) or a specific integrated circuit (Application Specific Integrated Circuit, ASIC) or one or more integrated circuits configured to implement embodiments of the present invention.

The processor 1203 is configured to determine a range of frequency resources indicated by the downlink control information DCI;

the processor 1203 is further configured to determine a frequency resource for data transmission according to the indication information in the DCI;

a receiver 1201 and a transmitter 1202 for transmitting data on said frequency resources for data transmission.

Optionally, the processor 1203 is specifically configured to:

the receiver 1201 is instructed to receive a seventh signaling sent by the base station, and determine the range of the frequency resource for DCI indication according to the indication information in the seventh signaling, where the seventh signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

Optionally, the receiver 1201 is further configured to receive a second DCI sent by the base station, where the DCI indicates a coding rate of the data.

Optionally, the encoding rate includes an aggregate level of resource granularity of the data.

Optionally, the processor 1203 is further configured to:

before the receiver 1201 and the transmitter 1202 transmit data on the frequency resource for data transmission, determining a transport block size TBS of the data as a preset TBS, or receiving an eighth signaling sent by the base station, and determining the TBS according to indication information in the eighth signaling, where the eighth signaling includes at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the processor 1203 is further configured to:

Alternatively, when the system bandwidth is one of {1.4mhz,3mhz,5mhz,10mhz,15mhz,20mhz }, or one of {6rb,15rb,30rb,50rb,75rb,100rb }, the range of the frequency resource for DCI indication is smaller than the system bandwidth.

Optionally, the receiver 1201 is further configured to:

receiving a second subframe configured by the base station;

The processor 1203 is further configured to instruct the receiver 1201 to determine to monitor a common control channel of the UE in the second subframe.

Optionally, the period of the second subframe is an integer multiple of the discontinuous reception period DRX.

The seventh signaling and the eighth signaling in this embodiment may be the same signaling, that is, the same signaling may include the indication information in the plurality of signaling; but may also be different signaling.

The UE of the present UE embodiment may perform the technical solution of the method embodiment shown in fig. 19 or the method performed by the corresponding UE in fig. 21.

Fig. 13 is a schematic structural diagram of a fourth embodiment of a base station according to the present invention, where the base station may send data in a manner of blind UE detection, so as to reduce control signaling overhead. As shown in fig. 13, the base station 1300 of the present embodiment may include: also shown are a receiver 1301, a transmitter 1302 and a processor 1303, a memory 1304 and a bus 1305, the receiver 1301, the transmitter 1302, the processor 1303 and the memory 1304 being connected by the bus 1305 and completing communication with each other.

The bus 1305 may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus 1305 may be classified as an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in fig. 13, but not only one bus or one type of bus.

Memory 1304 is used to store executable program code, which includes computer-operating instructions. The memory 1304 may include high-speed RAM memory or may further include non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.

The processor 1303 may be a central processing unit (Central Processing Unit, CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

The processor 1303 is configured to determine a transport block size TBS to be sent;

the processor 1303 is further configured to determine a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

a transmitter 1302, configured to transmit the transport block to the user equipment UE on the time domain resource and the frequency resource.

Optionally, the processor 1303 is specifically configured to:

determining the size of the transmission block as a preset TBS; or,

the transmitter 1302 is instructed to send a first signaling to the UE, where the first signaling includes indication information for determining a transport block size TBS, and the first signaling is at least one of: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

Optionally, the processor 1303 is further configured to:

determining the coding rate of the PDSCH;

the transmitter 1302 is specifically configured to transmit the transport block to a user equipment UE on the time domain resource and the frequency resource according to the coding rate of the PDSCH.

Optionally, the coding rate of PDSCH includes an aggregation level of resource granularity of the PDSCH;

the processor 1303 is specifically configured to:

Optionally, the aggregation level includes any one of the following resource granularity or a multiple of any one of the following resource granularity: CCE, ECCE, REG, EREG, PRB, VRB.

Optionally, the processor 1303 is specifically configured to:

the transmitter 1302 is instructed to send a second signaling to the UE, where the second signaling includes indication information for determining a resource block RB of the PDSCH, and the second signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the processor 1303 is specifically configured to:

determining the bandwidth for transmitting the PDSCH as a preset bandwidth;

the transmitter 1302 is instructed to transmit a third signaling to the UE, where the third signaling includes instruction information for determining a first starting position of a frequency resource of the PDSCH, and the third signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the processor 1303 is further configured to:

the transmitter 1302 is instructed to send fourth signaling to the UE, where the fourth signaling includes instruction information for enabling the UE to determine a second starting position of a frequency resource listening to the PDSCH, and the fourth signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the processor 1303 is specifically configured to:

and a fifth signaling indicating the transmitter 1302 to transmit to the UE, wherein the fifth signaling includes indication information for determining a first subframe for transmitting the PDSCH.

Optionally, the first subframe for transmitting the PDSCH is a subframe within the active time.

Optionally, the receiver 1301 is configured to receive an acknowledgement message ACK or a non-acknowledgement message NACK sent by the UE.

Optionally, when the base station does not receive the acknowledgement message ACK sent by the UE within a first preset time, the base station retransmits the transport block within a second preset time.

Optionally, the transmitter 1302 is further configured to:

Alternatively, when the transmitter 1302 transmits a control channel and a PDSCH in different first times, respectively, a time interval of the first time of transmitting the control channel is greater than or less than a time interval of the first time of transmitting the PDSCH.

Optionally, when the transmitter 1302 transmits a control channel and a PDSCH to the UE in a preset search space and/or a preset first time, the control channel or the PDSCH further includes preset first indication information, which is used for the UE to distinguish the control channel and the PDSCH.

Optionally, the processor 1303 is further configured to:

the transmitter 1302 is instructed to send a sixth signaling to the UE, where the sixth signaling includes indication information for determining that the PDSCH is in a listening mode, and the sixth signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the transmitter 1302 is specifically configured to:

In this embodiment of the present base station, the first signaling, the second signaling, the third signaling, the fourth signaling, the fifth signaling, the sixth signaling, and the ninth signaling may be the same signaling, that is, the same signaling may include the indication information in the plurality of signaling.

The base station of the present embodiment may execute the technical solution of the method embodiment shown in fig. 16 or the method executed by the corresponding base station in fig. 17.

In the base station of the embodiment, after the processor determines the size TBS of the transport block and the time domain resource and the frequency resource of the PDSCH, the transmitting module transmits the transport block to the UE on the time domain resource and the frequency resource, so that the UE can realize blind detection on the PDSCH, and thus, downlink data can be received without indication of DCI, and therefore, control signaling overhead can be reduced, and the transmission efficiency of the system is improved.

Fig. 14 is a schematic structural diagram of a fifth embodiment of a base station according to the present invention, where the base station may reduce control signaling overhead by changing the content of DCI. As shown in fig. 14, the base station 1400 of the present embodiment may include: also shown are a receiver 1401, a transmitter 1402 and a processor 1403, a memory 1404 and a bus 1405. The receiver 1401, the transmitter 1402, the processor 1403 and the memory 1404 are connected to each other via the bus 1405 and perform communication with each other.

The bus 1405 may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus 1405 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 14, but not only one bus or one type of bus.

Memory 1404 is used to store executable program code including computer-operating instructions. The memory 1404 may include a high-speed RAM memory or may further include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.

Processor 1403 may be a central processing unit (Central Processing Unit, CPU) or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or one or more integrated circuits configured to implement embodiments of the present invention.

Wherein, the processor 1403 is configured to determine a range of frequency resources indicated by the downlink control information DCI;

a transmitter 1402, configured to transmit the DCI to a user equipment UE, so that the UE determines a frequency resource for data transmission according to indication information in the DCI;

the transmitter 1402 and the receiver 1401 are configured to perform data transmission using the frequency resource for data transmission.

Optionally, the processor 1403 is specifically configured to:

instructing the transmitter 1402 to transmit seventh signaling to the UE, where the seventh signaling includes indication information for determining the range of the frequency resource for DCI indication, and the seventh signaling is at least one of: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

Optionally, the transmitter 1402 is further configured to:

Optionally, the coding rate indicated by the second DCI includes an aggregation level indicated by the DCI.

Optionally, the processor 1403 is further configured to:

instruct the transmitter 1402 to transmit eighth signaling to the UE, where the eighth signaling includes indication information for determining the TBS, and the eighth signaling includes at least one of the following: RRC signaling, MAC CE signaling, or DCI.

Optionally, the processor 1403 is further configured to:

the transmitter 1402 is instructed to transmit a third DCI to the UE, where the third DCI includes instruction information for determining a TBS in a specific modulation scheme.

Alternatively, when the system bandwidth is one of {1.4mhz,3mhz,5mhz,10mhz,15mhz,20mhz }, or one of {6rb,15rb,30rb,50rb,75rb,100rb }, the frequency range for DCI indication is smaller than the system bandwidth.

Optionally, the transmitter 1402 is further configured to:

The base station of the present embodiment may execute the technical solution of the method embodiment shown in fig. 20 or the method executed by the corresponding base station in fig. 21.

Fig. 15 is a flowchart of a first embodiment of a data transmission method according to the present invention, where an execution body of the embodiment is UE, and the data transmission method can be executed in cooperation with a base station. As shown in fig. 15, the data transmission method of the present embodiment may include:

in step 1501, the UE determines a transport block size TBS.

In step 1502, the UE determines a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block.

In step 1503, the UE receives the transport block on the time domain resource and the frequency resource.

In this embodiment, the UE may blindly detect the PDSCH according to the determined TBS, the time domain resource for transmitting the PDSCH, and the frequency resource, and of course, may also detect according to the DCI indication. When data on PDSCH is received only with blind detection, no indication of DCI is required.

In this embodiment, after determining the size TBS of a transport block and time domain resources and frequency resources of a PDSCH, the UE receives the transport block on the time domain resources and frequency resources, so blind detection of the PDSCH can be implemented, downlink data can be received without an indication of DCI, and therefore control signaling overhead can be reduced, thereby improving transmission efficiency of the system.

Fig. 16 is a flowchart of a second embodiment of a data transmission method according to the present invention, where the execution body of the embodiment is a base station, and the data transmission method can be executed in cooperation with a UE. As shown in fig. 16, the data transmission method of the present embodiment may include:

step 1601, the base station determines a transport block size TBS to be transmitted;

step 1602, the base station determines a time domain resource and a frequency resource for transmitting a physical downlink shared channel PDSCH, where the PDSCH is used for transmitting the transport block;

step 1603, the base station sends the transport block to the UE on the time domain resource and frequency resource.

In this embodiment, after determining the size TBS of the transport block and the time domain resource and frequency resource of the PDSCH, the base station transmits the transport block to the UE on the time domain resource and frequency resource, so that blind detection of the PDSCH can be achieved, downlink data can be received without the indication of DCI, and therefore control signaling overhead can be reduced, and the transmission efficiency of the system can be improved.

Fig. 17 is a signaling flow chart of a third embodiment of the data transmission method according to the present invention, where the execution body of the embodiment is a base station and a UE. As shown in fig. 17, the data transmission method of the present embodiment may include:

In step 1701, the base station determines a transport block size TBS to be transmitted.

In step 1702, the UE determines a transport block size TBS to be received.

Wherein the TBSs may be a subset of TBSs specified by the long term evolution, LTE, protocol.

Step 1701 and step 1702 may or may not be performed simultaneously, and in no order.

Step 1703, the base station determines time domain resources and frequency resources for transmitting PDSCH, where the PDSCH is used for transmitting the transport block.

Step 1704, the UE determines a time domain resource and a frequency resource of a PDSCH for transmitting the transport block.

Step 1703 and step 1704 may or may not be performed simultaneously, and in no order.

Step 1705, the base station sends the transport block to the UE on the time domain resource and the frequency resource.

Correspondingly, the UE receives the transmission block on the time domain resource and the frequency resource.

In this embodiment, after determining the size TBS of a transport block and time domain resources and frequency resources for transmitting PDSCH, the base station and the UE send the transport block to the UE on the time domain resources and frequency resources, respectively, so that blind detection of PDSCH can be achieved, downlink data can be received without indication of DCI, and therefore control signaling overhead can be reduced, and transmission efficiency of the system is improved.

Alternatively, for determination of TBS, TBS of PDSCH may be preset or signaled.

Specifically, the base station determining the TBS may include:

the base station sends a first signaling to the UE, wherein the first signaling comprises indication information for determining a transport block size TBS

Correspondingly, the UE determines a transport block size TBS, including:

the UE determines the size of the transmission block as a preset TBS; or,

and the UE receives a first signaling sent by a base station and determines the size TBS of the transmission block according to the indication information in the first signaling.

The first signaling may be at least one of: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

The number of preset TBSs may be 1 or more, and the TBSs adopted herein may be a subset of the existing TBS table, or may be newly added TBSs. When multiple TBSs are predefined, signaling may be used to indicate which TBS to use for blind detection.

When the TBS limit is 1000 bits or less, multiplexing the existing TBS value can be performed according to the following table:

Alternatively, the coding rate may be determined in addition to the TBS, time domain resources, frequency domain resources described above.

Specifically, the method may further include: the base station and the UE respectively determine the coding rate of the PDSCH; the base station sends the transmission block to the UE according to the coding rate of the PDSCH on the time domain resource and the frequency resource; and the UE receives the transmission block according to the coding rate of the PDSCH on the time domain resource and the frequency resource.

And the coding rate of the transmission PDSCH may include: and transmitting the aggregation level of the resource granularity of the PDSCH. Transmission of transport blocks of PDSCH may be performed using an aggregation of one or more resource granularity. Fig. 18 is a schematic diagram of resource granularity and aggregation level, where the resource granularity used in the embodiment of the present invention may be REG or EREG, CCE or ECCE, RB or PRB or VRB or N REG or N EREG or N CCE or N ECCE or N RB (or PRB or VRB) in the LTE system, and N is a natural number. The aggregation level used may be level 1, level 2, level 4, level 6, level 8, level 16, level32, or a subset thereof, as shown in FIG. 18.

In one implementation, the resource granularity includes any one of the following or a multiple of any one of the following: CCE, ECCE, REG, EREG, PRB, VRB.

For the determination of the aggregation level, the base station determines the aggregation level of the resource granularity of transmitting PDSCH, which may include:

the base station determines that the aggregation level of the resource granularity of transmitting the PDSCH is a preset aggregation level; or the base station sends a configuration message of aggregation level to the UE so that the UE determines the aggregation level of the resource granularity for transmitting the PDSCH according to the configuration message.

Accordingly, the UE determining an aggregation level of resource granularity of transmitting PDSCH may include:

and the UE determines the aggregation level of the resource granularity of the PDSCH to be transmitted as a preset aggregation level.

For the coding mode of the channel, convolutional coding or Turbo coding can be used to code (or decode) the transport block, and then rate matching (or aggregation level detection) is performed according to the aggregation level and the corresponding resource granularity. The convolutional codes have lower complexity than Turbo codes, and are beneficial to the reduction of the complexity/power consumption of the UE. Since Turbo coding has better performance than convolutional coding beyond the number of bits of a transmission block to be coded, for example, at 400 bits, turbo coding has about 1dB better performance than convolutional coding. The coding scheme of the transport blocks can thus be predefined or configured, for example convolutional coding can be predefined or configured by signaling when complexity is a major concern; when coding is selected according to the performance, a channel coding mode can be determined according to the size of a transmission block, convolutional coding is adopted when the size of the transmission block is lower than a certain value, and Turbo coding is adopted when the size of the transmission block is higher than a certain value. The coding process of the transport block is as follows: CRC is added to the transmission block, channel coding (convolutional coding or Turbo coding), rate matching and coding output are carried out.

Alternatively, for frequency domain resources, the frequency domain resources or locations of the transmission PDSCH may be predefined or signaled. While there may be two ways for frequency domain resource indication: one indicated by RB and one indicated by means of bandwidth and starting position.

When the frequency domain resources are indicated by RBs,

accordingly, the UE determining the frequency resource for transmitting PDSCH may include:

This is especially applicable when the frequency domain resources are indicated by means of bandwidths and starting positions, where the frequency domain resources are contiguous resources.

The base station determining frequency resources for transmitting PDSCH may include:

and the base station sends a second signaling to the UE, wherein the second signaling comprises indication information for determining Resource Blocks (RBs) of the PDSCH.

and the UE receives a third signaling sent by the base station and determines a first starting position of the frequency resource of the PDSCH according to the indication information in the third signaling.

The third signaling may be at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

The above process may determine a larger frequency domain resource range, and in a specific implementation, may further enable the UE to determine a smaller range within the larger frequency domain resource range for detection.

The base station determining frequency resources for transmitting PDSCH may further include: the base station sends fourth signaling to the UE, wherein the fourth signaling comprises indication information for enabling the UE to determine a second starting position of frequency resources for monitoring the PDSCH.

Accordingly, the UE determining the frequency resource for transmitting PDSCH may further include:

and the UE receives a fourth signaling sent by the base station and determines a second starting position of the frequency resource for monitoring the PDSCH according to the indication information in the fourth signaling. Or the UE determines a second starting position of the frequency resource for monitoring the PDSCH according to a preset hash function.

The fourth signaling may be at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Specifically, the bandwidth of the frequency domain resource transmitting the PDSCH may be predefined or configured, such as predefined that the bandwidth corresponds to 6 RB. And the search space is defined as a set of possible frequency domain positions of the PDSCH, i.e., a set of candidate frequency domain positions, which are distributed over the configured bandwidth. The starting position of the PDSCH search space may be configured by fourth signaling, from which the UE performs blind detection at a predefined or configured aggregation level. The starting position of the PDSCH search space may also be dynamically changed, where the UE may determine according to a hash (hash) function, and the method of determining the frequency domain position of the PDSCH according to the hash function is similar to the method of determining the frequency domain position of the PDCCH or EPDCCH. For example, the method may include:

in subframe k, for one predefined or configured set p of PDSCH PRBs (corresponding to the above-mentioned frequency domain positions), the set m of frequency domain positions of candidate PDSCH contains or corresponds to a resource granularity of:

where L is an aggregation level that is a subset of the EPDCCH aggregation level values or additionally includes an aggregation level 6. The EPDCCH aggregation level has a value of {1,2,4,8, 16, 32}.

Wherein N is _{PDSCH_G,p,k} The number of PDSCH resource granularity contained in the PDSCH PRB set p of the subframe k; i=0, …, L-1; the number of candidates (positions) to be monitored or blindly detected by the UE when the corresponding aggregation level of the PRB set p is L.

Variable Y _p,k Defined as Y _p,k ＝(A _p ·Y _p,k-1 )modD，Y _p,-1 ＝n _RNTI ≠0，A ₀ ＝39827，A ₁ =39829, d=65537 sumRNTI is the allocated identifier of UE, n _s The time slot number in 1 frame is one of 0 to 19.

For time domain resources for transmitting PDSCH, it may be determined by signaling or by pre-configuration.

Specifically, the base station determining the time domain resource for transmitting PDSCH may include:

Accordingly, the UE determining the time domain resource for transmitting the PDSCH may include:

and the UE receives a fifth signaling sent by the base station and determines that the time domain resource for transmitting the PDSCH is a first subframe according to the indication information in the fifth signaling, or the UE determines that the subframe of the PDSCH is a preset first subframe.

Wherein the fifth signaling may be at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

In particular implementations, discontinuous reception times (Discontinuous Reception, abbreviated DRX) may be configured for transmission of PDSCH. Referring to fig. 2, the ue may perform PDSCH detection over several non-contiguous time intervals. In fig. 2, the UE performs blind detection of PDSCH at the active time (On duration) of each DRX cycle. Accordingly, the indication information in the fifth signaling may further include a discontinuous reception period, a start subframe of the discontinuous reception, and an active time, where the active time may include a time corresponding to a detection active timer (on duration timer) and/or a time corresponding to an inactivity timer (inactivity timer).

In this way, the indication information in the fifth signaling further includes a discontinuous reception period, a start subframe of discontinuous reception, and an active time, where the active time includes a time corresponding to a detection active timer (on duration timer) and/or a time corresponding to an inactivity timer (inactivity timer).

Further, the first subframe for transmitting PDSCH is a subframe within the active time.

Wherein the discontinuous period may be a discontinuous reception period for PDCCH configuration or an extension thereof, for example, the discontinuous reception period for transmitting PDSCH may be an integer multiple of the discontinuous reception period for transmitting PDCCH.

The subframe number corresponding to the starting subframe can be obtained from the following formula: [ (SFN x 10) +subframe number ] module (DRX-Cycle) =drxstartoffset. In the formula, SFN is a system frame number, the range is 0-xx, the subframe number is a number of 0-9, DRX-Cycle is a period for discontinuously receiving PDSCH, the finger of DRX-Cycle can be configured by a base station, and a subframe defined as the beginning of the DRX period can be configured by the base station.

The active time represents the time the UE needs to blindly detect PDSCH. Which may include at least the time of on duration timer run or the time of inactivity timer run. The time of the Inactivity timer operation indicates the time that the UE needs to perform continuous detection after receiving the PDSCH, and when the UE does not detect the PDSCH within the timer time value and exceeds the configured time value, the UE enters the DRX cycle, or when the UE receives a MAC signaling configuring DRX, the UE enters the DRX cycle. In addition to the long period, there may optionally be a short DRX period. At this time, the UE may first enter a short period, and enter a long DRX period again without receiving the PDSCH in the short period.

Further, it is possible to confirm whether the UE successfully blindly detects the PDSCH in the following manner. One is that the UE sends an ACK to the base station for acknowledgement in the n+k subframes after detecting the subframe of the PDSCH, and if the base station does not receive the ACK acknowledgement within a preset time, the PDSCH may continue to be sent, for example, in the n+k+m subframes, and at this time, the PDSCH is sent at a lower code rate or at a higher aggregation level. The repeated PDSCH (or repeatedly transmitted transport block) or the new PDSCH (or newly transmitted transport block) may be distinguished by a scrambling code scrambled at the CRC. The scrambling code may be preset or configured by the base station. If the time when the ACK is not received exceeds a certain threshold, the base station can also start a coverage enhancement mode, for example, the base station can configure p continuous subframes to send the same PDSCH so as to accumulate energy for coverage enhancement, and the UE detects the PDSCH according to the p continuous subframes according to the configuration so as to improve the success rate of data reception. Wherein n, k, m and p are integers.

For the UE, after the UE receives the transport block on the time domain resource, the frequency resource according to the coding rate, the method may further include:

Accordingly, for the base station, after the base station transmits the transport block to the UE on the time domain resource and the frequency resource, the method further includes:

The third embodiment of the data transmission method and various implementations thereof describe a manner of transmitting downlink data by blind detection of PDSCH, and in the following implementations, the UE is supported to fall back to a manner of receiving PDSCH according to the indication of the control channel in a specific search space and/or a specific first time.

Specifically, the base station may send a control channel and/or PDSCH to the UE in a preset search space and/or a preset first time. Wherein the control channels include a PDDCH and an E-PDDCH.

Correspondingly, the UE monitors a control channel and/or a PDSCH in a search space configured by the base station and/or a first time configured by the base station.

The control channel may be transmitted only to the UE, the PDSCH may be transmitted only to the UE, or the control channel and PDSCH may be transmitted simultaneously to the UE, within a dedicated search space of the UE or some first time (or both the search space and the first time). The corresponding transmission modes can include the following: transmitting only the control channel in the UE's dedicated search space (without limitation on time); transmitting only PDSCH in UE's dedicated search space (without limitation on time); transmitting the control channel and PDSCH simultaneously in the UE's dedicated search space (without time limitation); only transmitting PDSCH in a certain first time (without limiting the frequency domain); only transmitting PDSCH in a certain first time (without limiting the frequency domain); simultaneously transmitting a control channel and a PDSCH at a certain first time (without limiting a frequency domain); transmitting only PDSCH in the UE's dedicated search space and for a certain first time period; transmitting only control channels in a dedicated search space of the UE and for a certain first time period; PDSCH and control channel are transmitted simultaneously in the UE's dedicated search space and for some first period of time. Wherein the first time may be a predefined or configured period of time such as a subframe or subframes at the beginning of a discontinuous reception time period. As shown in fig. 5, the control channel and PDSCH may be monitored at the same time, and may not be monitored at the same time.

Further, it is also possible to define: when the base station transmits the control channel and the PDSCH in different first times respectively, the time interval or period of the first time of transmitting the control channel is greater than or less than the time interval or period of the first time of transmitting the PDSCH. When the time interval or period of the first time of transmitting the control channel is larger than the time interval or period of the first time of transmitting the PDSCH, the signaling overhead is saved; when the time interval or period of the first time of transmitting the control channel is smaller than the time interval or period of the first time of transmitting the PDSCH, the method is favorable for quickly switching to a signaling scheduling mode to perform other TBS switching or HARQ or coverage enhancement transmission mode and the like.

Further, in one implementation, when the base station sends a control channel and a PDSCH to the UE in a preset search space and/or a preset first time, the control channel or the PDSCH further includes preset first indication information, which is used for the UE to distinguish the control channel and the PDSCH.

Further, in the foregoing embodiments, for whether the PDSCH currently transmitted is a listening module (i.e., whether the UE side needs to perform blind detection), the base station may determine that the PDSCH is in a listening mode according to a preset rule, or send a sixth signaling to the UE to notify the UE that the PDSCH is in a listening mode.

Correspondingly, the UE may determine that the PDSCH is in a listening mode according to a preset rule, or receive a sixth signaling sent by the base station, and determine that the PDSCH is in a listening mode according to indication information in the sixth signaling.

Wherein the sixth signaling is at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling. When RRC signaling is employed, an enable signaling may be set for configuration.

When the base station transmits the PDSCH, the base station can transmit the PDSCH by using an MBSFN subframe or a non-MBSFN subframe, and when the base station transmits the PDSCH by using the non-MBSFN subframe, the base station can transmit the PDSCH by using an antenna port 0 or a transmission diversity mode; when PDSCH is transmitted using MBSFN subframes, the PDSCH may be transmitted using antenna port 7.

Further, in the above method embodiment, the method may further include:

the base station and the UE determine the modulation mode of the PDSCH according to a preset rule, or,

the UE receives a ninth signaling sent by the base station, and determines a modulation mode of the PDSCH according to indication information in the ninth signaling, wherein the ninth signaling is at least one of the following: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

For example, the UE may determine whether the PDSCH is in a specific modulation scheme according to whether the channel quality range of the PDSCH is in a channel quality range corresponding to the specific modulation scheme.

In the above method embodiment, the TBS may be a subset of TBSs specified by a long term evolution LTE protocol; the first signaling, the second signaling, the third signaling, the fourth signaling, the fifth signaling, the sixth signaling, and the ninth signaling in the above embodiments may be the same signaling, that is, the same signaling may include the indication information in the above multiple signaling.

Fig. 19 is a flowchart of a fourth embodiment of a data transmission method according to the present invention, where an execution body of the embodiment is UE, and the data transmission method can be executed in cooperation with a base station, and the embodiment reduces the overhead of control signaling by reducing the indication information of DCI. As shown in fig. 19, the data transmission method of the present embodiment may include:

step 1901, the UE determines a range of frequency resources for DCI indication.

Step 1902, the UE determines a frequency resource for data transmission according to the indication information in the DCI.

Step 1903, the UE transmits data on the frequency resource used for data transmission.

In the method of the embodiment, the UE determines the maximum bandwidth indicated by the DCI or the frequency resource corresponding to the maximum bandwidth, then determines the frequency resource used for data transmission according to the indication information in the DCI, and performs data transmission through the frequency resource; since the maximum bandwidth that the DCI can indicate is not the system bandwidth but a smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced and the efficiency of system transmission can be improved.

Fig. 20 is a flowchart of a fifth embodiment of a data transmission method according to the present invention, where an execution body of the embodiment is a base station, and the data transmission method can be executed in cooperation with a UE, and the embodiment reduces the overhead of control signaling by reducing the indication information of DCI. As shown in fig. 20, the data transmission method of the present embodiment may include:

step 2001, the base station determines a range of frequency resources for DCI indication.

Step 2002, the base station sends the DCI to the UE, so that the UE determines frequency resources for data transmission according to the indication information in the DCI.

Step 2003, the base station uses the frequency resource for data transmission to perform data transmission.

In the method of the embodiment, a base station firstly determines a range of frequency resources for indicating DCI, namely, firstly determines a maximum bandwidth which can be indicated by DCI or a frequency resource corresponding to the maximum bandwidth, then determines the frequency resources for data transmission according to indication information in the DCI, and performs data transmission through the frequency resources; since the maximum bandwidth or the maximum bandwidth that the DCI can indicate is not the system bandwidth but a smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced and the efficiency of system transmission can be improved.

Fig. 21 is a signaling flow chart of a sixth embodiment of the data transmission method of the present invention, where the execution body of the present embodiment is a base station and a UE. As shown in fig. 21, the method of the present embodiment may include:

in step 2101, the base station determines a range of frequency resources for DCI indication.

Step 2102, the UE determines a range of frequency resources for DCI indication.

Wherein step 2101 and step 2102 have no sequential relationship.

Step 2103, the base station sends the DCI to the UE.

Step 2104, the UE determines a frequency resource for data transmission according to the indication information in the DCI.

The DCI information is carried by PDCCH or EPDCCH, and the UE detects and decodes the PDCCH or EPDCCH to obtain the information in the DCI.

Step 2105, the base station and the UE transmitting data on the frequency resources for data transmission.

The data transmission here includes that the UE receives downlink data transmitted from the base station, and the UE transmits uplink data to the base station. I.e. the channels carrying data, may be PDSCH and physical uplink shared channel (Physical Uplink Shared Channel, abbreviated: PUSCH).

Compared with the DCI of the prior art, the present embodiment reduces the indication content in the DCI, thereby reducing the number of indication bits contained in the DCI. Specifically, for the problem that the existing DCI covers the whole system bandwidth under different system bandwidths, the resource indication overhead is too large, and the present embodiment considers reducing the maximum bandwidth that can be indicated by the DCI or the frequency resource corresponding to the maximum bandwidth, so as to reduce bits of the DCI format. For this purpose, the maximum bandwidth that can be supported by the DCI format or the frequency resource corresponding to the maximum bandwidth may be preset or configured, for example, the bandwidth corresponding to 6 RBs. In addition to presetting or configuring the maximum bandwidth supported by the DCI or the frequency resource corresponding to the maximum bandwidth, a frequency domain resource location corresponding to the maximum bandwidth supported by the DCI may be preset or configured, for example, an RB location is determined, and when configuring the frequency domain resource location, a resource allocation type of LTE, such as type 0 or type 1 or type 2, may be used for indication. Wherein resource allocation type 2 supports both centralized and distributed resource allocation. Wherein, the resource allocation type 0 of LTE divides continuous RBs into groups, and each group uses 1bit to indicate whether to use or not; the resource allocation type 1 of LTE is that discrete RBs are divided into a plurality of sets, whether the sets are used or not is indicated firstly, and then whether the RBs in the sets are used or not is indicated; the resource allocation type 2 of LTE indicates a start position and a length of a continuous band of frequency domain resources and supports one RB located in 2 slots, respectively, to be located in the same frequency or different frequencies.

In the method of the embodiment, a base station and a UE determine a range of frequency resources for DCI indication, that is, determine a maximum bandwidth that can be indicated by DCI or a frequency resource corresponding to the maximum bandwidth, and then determine a frequency resource for data transmission according to indication information in DCI, and perform data transmission through the frequency resource; since the maximum bandwidth that the DCI can indicate is not the system bandwidth but a smaller bandwidth, the indication information used for determining the frequency resource used for data transmission in the DCI can be reduced, that is, the indication content of the DCI is reduced, so that the signaling overhead can be reduced and the efficiency of system transmission can be improved.

In the above embodiment, for the range of frequency resources used for DCI indication, it may be determined by a preset or signaling manner, so for step 2101, the base station may use a preset first frequency resource as the range of frequency resources used for DCI indication; or the base station sends seventh signaling to the UE, where the seventh signaling includes indication information for determining the range of the frequency resource used for DCI indication.

Accordingly, for step 2102, the UE may employ a preset first frequency resource as a range of frequency resources for DCI indication; or receiving a seventh signaling sent by the base station, and determining the range of the frequency resource for DCI indication according to indication information in the seventh signaling.

Wherein the seventh signaling may be at least one of: RRC signaling, PDCCH, EPDCCH or medium access control MAC control element CE signaling.

Further, in the above embodiment, the TBS and the coding rate of the data may be preset or configured. When the TBS is predefined or configured, transmission of different aggregation levels or resource granularity numbers can be performed on the PDSCH or PUSCH to support different code rates and save MCS signaling overhead, at this time, signaling can be used to perform notification of the aggregation level, for example, 3-bit support can be used to support indication of states of aggregation levels 1, 2, 4, 8, 16, 32, and the like.

Specifically, the base station may further transmit a second DCI to the UE, where the second DCI includes indication information for indicating a coding rate of the data.

Before the UE transmits data on the frequency resource for data transmission, further comprising:

The UE receives a second DCI sent by the base station, where the DCI indicates a coding rate of the data, i.e., a coding rate of a PDSCH or PUSCH.

Wherein the coding rate may be an aggregation level of resource granularity of the data, or a coding rate defined in a modulation and coding scheme (Modulation and Coding Scheme, abbreviated MCS). The coding rate indicated by the second DCI includes an aggregation level indicated by the DCI.

Optionally, the base station may further determine that a transport block size TBS of the transmission data is a preset TBS, or the base station sends eighth signaling to the UE, where the eighth signaling includes indication information for determining the TBS.

Accordingly, before the UE transmits data on the frequency resource for data transmission, the method further comprises:

the UE determines the TBS of the transmission block size of the data as a preset TBS, or the UE receives an eighth signaling sent by the base station and determines the TBS according to indication information in the eighth signaling.

Wherein the eighth signaling may include at least one of: RRC signaling, PDCCH, EPDCCH or MAC CE signaling.

Optionally, the base station may further determine a TBS under a specific modulation mode, and send a third DCI to the UE, so that the UE determines the TBS under the specific modulation mode according to the indication information in the DCI.

and receiving third DCI sent by the base station, and determining TBS under a specific modulation mode according to the indication information in the DCI.

The specific modulation mode may be specifically determined by a preset or signaling configuration.

That is, in the above embodiment, the modulation and coding scheme of the data may be preset or configured or a combination of preset and configuration. This method reduces MCS indication bits by defining the modulation scheme of the MCS indication in the DCI.

In one mode, the preset modulation mode may be one of QPSK, 16QAM, and 64 QAM. The Modulation and Coding Scheme (MCS) or coding rate of the data in the modulation scheme is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

In another manner, the modulation manner of the configurable data may be one of QPSK, 16QAM, and 64QAM, and the configuration signaling may be RRC signaling or MAC CE signaling. The Modulation and Coding Scheme (MCS) or coding rate of the data in the modulation scheme is then configured to indicate the TBS, and the configuration signaling may be DCI signaling.

The following describes the variation of the information amount in DCI by the method described in this embodiment, for three resource allocation types of LTE, respectively.

In the first example, taking DCI format1 supporting resource allocation of LTE with resource allocation types 0 and 1 as an example, it is assumed that the system bandwidth is 10MHz, i.e., 50RB, and the duplex mode is FDD.

Before changing the content of DCI format1, the information included in the DCI and the number of bytes occupied are as follows:

resource allocation head: 1 bit;

Resource block allocation: 18 bits;

modulation and coding scheme: 5 bits;

HARQ process number: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

transmission power control command of PUCCH: 2 bits;

HARQ resource offset indication: 2 bits;

together 34 bits.

The method of the present embodiment is applied, and the range of the frequency resource indicated by DCI is set to 6RB. The content in DCI format1 may be different for different resource granularities, predefined or configured, as will be described below, respectively.

In the first mode, RB is taken as the granularity of resources, andthe corresponding bandwidth or the number of RBs isHere, the value is 6 (corresponding to the frequency resource range 6RB indicated by DCI), the DCI format1 content may be changed to:

resource allocation head: 1 bit;

resource block allocation: 6 bits;

modulation and coding scheme: 3 bits;

HARQ process number: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

transmission power control command of PUCCH: 2 bits;

HARQ resource offset indication: 2 bits;

a total of 20 bits. According to the existing DCI constraint, when the number of DCI bits is 20, zero needs to be filled, and the number becomes 21 bits.

In the second mode, 1 ECCE is used as a resource granularity, the range of the frequency resource indicated by the DCI is also 6RB, and the corresponding relationship between the ECCE group size and ECCE number of the resource allocation type 0 is shown in the following table.

/>

The number of bits needed for resource allocation for ECCE groups is

The fixed bandwidth is 6RB and the number of ECCE is corresponding to24, so ECCE group p=2, the number of bits required isThe DCI format1 content may be changed to:

resource allocation head: 1 bit;

resource block allocation: 12 bits;

modulation and coding scheme: 3 bits;

HARQ process number: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

transmission power control command of PUCCH: 2 bits;

HARQ resource offset indication: 2 bits;

together 26 bits. According to the existing DCI constraint, when the number of DCI bits is 26, zero is needed to be filled, and the number becomes 27 bits.

In the third mode, 2 ECCEs are used as resource granularity, the range of the frequency resource indicated by DCI is also 6RB, the corresponding relationship between the size of the ECCE group of the resource allocation type 0 and the number of the ECCEs is shown in the following table,

the number of bits needed for resource allocation for ECCE groups is

When the fixed bandwidth is 6RB, the corresponding ECCE number is12, so ECCE group p=2, the number of bits required is +.>The DCI format1 content may be changed to:

resource allocation head: 1 bit;

resource block allocation: 6 bits;

modulation and coding scheme: 3 bits;

HARQ process number: 3 bits;

New data indicates: 1 bit;

redundancy version: 2 bits;

transmission power control command of PUCCH: 2 bits;

HARQ resource offset indication: 2 bits;

In the second example, taking DCI format1A supporting resource allocation type 2 as an example, assuming that the system bandwidth is 10MHz, i.e., 50rb, fdd duplex mode, DCI content change before and after overhead reduction is examined.

Before changing the content of DCI format1A, the information included in the DCI and the number of bytes occupied are as follows:

format0/1A distinction: 1 bit;

centralized/distributed VRB allocation identity: 1 bit;

and (3) resource allocation:bits;

MCS:5 bits;

number of HARQ processes: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

power control command of PUCCH: 2 bits;

HARQ-ACK resource offset: 2 bits;

a total of 28 bits.

The method of the present embodiment is applied, and the range of the frequency resource indicated by DCI is set to 6RB. For different resource granularities that are predefined or configured, the content in DCI format1 may include:

in the first mode, RB is taken as the resource granularity, and the corresponding bandwidth or the number of RBs is taken as Here, the value is 6 (corresponding to the frequency resource range 6RB indicated by DCI), the DCI format1 content may be changed to:

format0/1A distinction: 1 bit;

centralized/distributed VRB allocation identity: 1 bit;

and (3) resource allocation:bits;

MCS:3 bits;

number of HARQ processes: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

power control command of PUCCH: 2 bits;

HARQ-ACK resource offset: 2 bits;

In the second mode, 1 ECCE is used as the resource granularity, and the corresponding ECCE number isThe fixed bandwidth is 6RB, which contains 24 ECCEs, and the corresponding number of resource allocation bits isBits.

The DCI format1 content may be changed to:

format0/1A distinction: 1 bit;

centralized/distributed VRB allocation identity: 1 bit;

and (3) resource allocation: 9 bits;

MCS:3 bits;

number of HARQ processes: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

power control command of PUCCH: 2 bits;

HARQ-ACK resource offset: 2 bits;

together 24 bits.

In the third mode, 2 ECCEs are used as resource granularity, and the range of the frequency resource indicated by the DCI 6RB, including 24 ECCEs, and the number of corresponding ECCEGs is 12, and the number of corresponding resource allocation bits isBits, DCI format1 content may be changed to:

format0/1A distinction: 1 bit;

centralized/distributed VRB allocation identity: 1 bit;

and (3) resource allocation: 9 bits;

MCS:3 bits;

number of HARQ processes: 3 bits;

new data indicates: 1 bit;

redundancy version: 2 bits;

power control command of PUCCH: 2 bits;

HARQ-ACK resource offset: 2 bits;

together 24 bits.

In a third example, taking UL DCI format0 as an example, the DCI signaling change situation caused by defining a maximum supported bandwidth such as 6RB and combining the change content is analyzed:

assuming duplex mode as FDD, the system bandwidth is 10MHz, i.e., 50 RBs.

Before changing the content of DCI format0 by taking RB as resource granularity, the information and the number of bytes occupied in DCI are as follows:

format0/1A distinguishing mark: 1 bit;

and (3) frequency hopping identification: 1 bit;

resource block allocation and frequency hopping resource allocationBits;

MCS:5 bits;

new data indicates: 1 bit;

scheduled PUSCH power control commands: 2 bits;

demodulation pilot period offset and orthogonal code index: 3 bits;

channel state information request: 1 bit;

A total of 25 bits.

The method of the present embodiment is applied, and the range of the frequency resource indicated by DCI is set to 6RB.

In the first mode, the granularity of the resource is RB, and the corresponding bandwidth or the number of RBs isHere, the value is 6, the DCI format0 content may be changed to:

the number or composition of bits after the Format0 supports bandwidth and MCS content is:

format0/1A distinguishing mark: 1 bit;

and (3) frequency hopping identification: 1 bit;

resource block allocation and frequency hopping resource allocationBits; />

MCS:3 bits;

new data indicates: 1 bit;

scheduled PUSCH power control commands: 2 bits;

demodulation pilot period offset and orthogonal code index: 3 bits;

channel state information request: 1 bit;

a total of 17 bits.

In the second mode, 1 ECCE is used as the resource granularity, and the corresponding ECCE number isThe fixed bandwidth is 6RB, which contains 24 ECCEs, and the corresponding resource block allocation and frequency hopping resource allocation bit number isBits.

The DCI format1 content may be changed to:

format0/1A distinguishing mark: 1 bit;

and (3) frequency hopping identification: 1 bit;

resource block allocation and frequency hopping resource allocation 9 bits;

MCS:3 bits;

new data indicates: 1 bit;

scheduled PUSCH power control commands: 2 bits;

Demodulation pilot period offset and orthogonal code index: 3 bits;

channel state information request: 1 bit;

a total of 21 bits.

In the third mode, 2 ECCEs are used as resource granularity, or ECCEG is called ECCE group, which contains 2 ECCEs, and the number of corresponding ECCEG isThe fixed bandwidth is 6RB, which contains 24 ECCEs, the number of corresponding ECCEGs is 12, and the number of corresponding resource allocation bits is +.>Bits.

The DCI format1 content may be changed to:

format0/1A distinguishing mark: 1 bit;

and (3) frequency hopping identification: 1 bit;

resource block allocation and frequency hopping resource allocation of 7 bits;

MCS:3 bits;

new data indicates: 1 bit;

scheduled PUSCH power control commands: 2 bits;

demodulation pilot period offset and orthogonal code index: 3 bits;

channel state information request: 1 bit;

a total of 19 bits.

In the above example the DCI considers values comprising other indication bits than the resource allocation bits. The DCI of the present invention includes at least resource allocation bits and may further include one or more other indication bits in the DCI. The indication information not included in the DCI may be configured through predefined or higher layer signaling such as RRC or MAC CE.

The case where no other indication bits are included will be described using 2 examples below.

In the first example, for DCI for 0, its maximum supported bandwidth is defined to be 6RB,

in the first mode, the granularity of the resource is RB, and the corresponding bandwidth or the number of RBs isHere, the value is 6, and the content of DCI format0 may be changed to:

resource block allocation bits:bits;

at this point a total of 5 bits.

If one new data indication bit is superimposed, the total number of bits is 6 bits.

In the second example, for DCI for 0, the frequency resource range that is limited to be maximally supported is 2RB, and in addition to the above-mentioned indication method, indication may be considered in a manner of using a bit map, the state corresponding to 2 bits may be 00, 01, 10, 11, a bit may be set to 1 to indicate that the corresponding RB is configured, and a bit to 0 indicates that the corresponding RB is not configured.

As can be seen from the above examples, with the method of the present embodiment, the number of bits occupied by the indication content in the DCI can be reduced, so that the signaling overhead can be saved compared with the prior art.

Alternatively, in the above embodiments, semi-static scheduling or persistent scheduling or called non-dynamic scheduling may also be introduced, where no DCI indication of a specific UE is included in the non-dynamic scheduling indication period. Semi-persistent scheduling refers to that the PDSCH or PUSCH transmitted first occurs at a certain period, for example, once in 20ms, and only the PDSCH or PUSCH at the time when the semi-persistent scheduling is started first has a corresponding DCI indication, and the PDSCH or PUSCH occurring at a certain period thereafter has no DCI indication, thus being called semi-persistent scheduling. But once some primary PDSCH or PUSCH transmission errors, i.e. the receiver feeds back a NACK to the sender after detecting the errors, the sender may send a scheduling indication of the DCI for HARQ retransmission. Since some applications, such as M2M, may have a relatively long 2 traffic transmission interval, e.g., on the order of minutes or hours, the UE may receive discontinuously between 2 transmission times or be in a standby (idle) state to facilitate power saving. It is thus possible to consider to have the period of the non-dynamic schedule correspond to the period of the DRX, such as having them the same period. The current DRX cycle supports a maximum of 2.56s, so the period of the non-dynamic scheduling may be equal to the extended DRX cycle, which may be set to an integer multiple of the DRX cycle, for example.

In the non-dynamic scheduling period, when there is no HARQ retransmission, in order to ensure more reliable transmission, the base station may configure a lower code rate and modulation mode for PDSCH or PUSCH at the initial scheduling, and may be solved by higher layer retransmission, such as ARQ, when a certain amount of erroneous packets are accumulated. When there is HARQ retransmission, starting up-link or down-link retransmission according to feedback from the receiving end received by the sending end. For PUSCH transmission, the UE may retransmit after receiving a physical HARQ indicator channel (Physical HARQ Indicator Channel, abbreviated PHICH) channel or PDCCH or EPDCCH channel indication on the downlink. For PDSCH transmission, the UE may receive PDSCH on the downlink with PDCCH or EPDCCH channel indicating retransmission. In order to reduce signaling overhead caused by PDCCH or EPDCCH indication retransmission, the method for reducing indication information of DCI in the above embodiment may also be used.

Specifically, the method of the above embodiment may further include:

and the UE receives a second subframe configured by the base station, and monitors a common control channel in the second subframe, namely the UE does not monitor a special control channel of the UE in the second subframe.

Further, it may be further defined that the period of the second subframe is an integer multiple of a discontinuous reception period DRX.

The seventh signaling and the eighth signaling in the above embodiment may be the same signaling, that is, the same signaling may include the indication information in the plurality of signaling; but may also be different signaling.

Fig. 22 is a schematic structural diagram of a first embodiment of the system of the present invention, as shown in fig. 22, the system of the present embodiment may include: the UE according to any one of the embodiments of fig. 1, 2-4 and the base station according to the embodiment of fig. 8 or 9; alternatively, the UE described in the embodiment shown in fig. 11 and the base station described in the embodiment shown in fig. 13.

Fig. 23 is a schematic structural diagram of a second embodiment of the system of the present invention, as shown in fig. 23, the system of the present embodiment may include: the UE of the embodiment shown in fig. 6 or fig. 7 and the base station of the embodiment shown in fig. 10; alternatively, the UE described in the embodiment shown in fig. 12 and the base station described in the embodiment shown in fig. 14.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. A data transmission method, comprising:

receiving first indication information, wherein the first indication information is used for indicating a second frequency domain resource used for data transmission in a first frequency domain resource and a special search space on the second frequency domain resource, and the first indication information is downlink control information;

receiving second indication information, and determining a transport block size TBS of the data according to the second indication information;

receiving third indication information, and determining time domain resources of the data according to the third indication information;

the data transmission is performed by blind detection in the dedicated search space on the second frequency domain resource.

2. The method of claim 1, wherein the range of the first frequency domain resource is less than a system bandwidth, wherein the system bandwidth is one of 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, or 20MHz, or one of 6RB, 15RB, 30RB, 50RB, 75RB, or 100 RB.

3. The method according to claim 1 or 2, further comprising:

and receiving Radio Resource Control (RRC) signaling, wherein the RRC signaling indicates the starting position and the length of the first frequency domain resource.

4. The method as recited in claim 1, further comprising:

a location of the first frequency domain resource is determined.

5. The method of claim 1, further comprising, prior to data transmission on the second frequency domain resource:

and determining the TBS of the data as a preset TBS.

6. The method as recited in claim 1, further comprising:

and receiving configuration information of a second subframe, and monitoring a common control channel on the second subframe.

7. The method of claim 6 wherein the period of the second subframe is an integer multiple of a discontinuous reception, DRX, period.

8. A data transmission method, comprising:

Transmitting first indication information to User Equipment (UE), wherein the first indication information is used for indicating a second frequency domain resource used for data transmission in a first frequency domain resource and a special search space on the second frequency domain resource, and the first indication information is downlink control information;

transmitting second indication information, wherein the second indication information is used for determining the transmission block size TBS of the data;

transmitting third indication information, wherein the third indication information is used for determining time domain resources of the data;

and adopting the special search space on the second frequency domain resource to perform the data transmission.

9. The method of claim 8, wherein the first frequency domain resource is in a range less than a system bandwidth, wherein the system bandwidth is one of 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, or 20MHz, or one of 6RB, 15RB, 30RB, 50RB, 75RB, or 100 RB.

10. The method according to claim 8 or 9, further comprising: the first frequency domain resource is determined.

11. The method as recited in claim 8, further comprising: and transmitting Radio Resource Control (RRC) signaling to the UE, wherein the RRC signaling indicates the starting position and the length of the first frequency domain resource.

12. The method of claim 8, wherein the method further comprises:

and determining the TBS of the data as a preset TBS.

13. The method of claim 8, wherein the method further comprises:

and sending configuration information of a second subframe to the UE, wherein the configuration information is used for indicating the UE to monitor a common control channel on the second subframe.

14. The method of claim 13, wherein the period of the second subframe is an integer multiple of a discontinuous reception, DRX, period.

15. A data transmission device, characterized in that the device is arranged to perform the method according to any of claims 1-7.

16. A data transmission device, characterized in that the device is arranged to perform the method according to any of claims 8-14.

17. A communication device comprising a processor and a memory, the memory for storing executable program code, the processor for executing the program code to cause the communication device to perform the method of any of claims 1-7.

18. The communication device according to claim 17, characterized in that the communication device is a user equipment UE.

19. A communication device comprising a processor and a memory, the memory for storing executable program code, the processor for executing the program code to cause the communication device to perform the method of any of claims 8-14.

20. The communication device of claim 19, wherein the communication device is a base station.

21. A communication system comprising a communication device according to claim 17 and a communication device according to claim 19.

22. A readable storage medium storing executable program code which, when executed by a processor, causes an apparatus comprising the processor to perform the method of any one of claims 1-7, or any one of claims 8-14.