Data transmission method and user equipment

Abstract

A data transmission method in the present application includes: determining, by first UE, a frame structure in a time unit, where the frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is Δf 1 . Therefore, according to the data transmission method and the user equipment in embodiments of the present application, a frame structure in a time unit is determined. The frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is Δf 1 . Therefore, when an NB-IOT system is deployed in an LTE system in an embedded manner, and when NB-IOT UE is sending data, a channel resource of the legacy LTE system can be adequately utilized, and a conflict with a legacy LTE SRS can be avoided.

What is claimed is: 
     
         1 . A data transmission method, wherein the method comprises:
 indicating, by a base station, a first subcarrier spacing to a terminal, wherein the first subcarrier spacing is used by the terminal to determine a frame structure; and   receiving, by the base station, an N type-1 orthogonal frequency division multiplexing (OFDM) symbols generated by the terminal based on the frame structure in a time unit,   wherein the frame structure indicates that the N type-1 OFDM symbols and a guard period (GP) are comprised in the time unit,   wherein the first subcarrier spacing of each type-1 OFDM symbol is Δf 1 ,   wherein a first time length of the GP is greater than a second time length occupied by one type-2 OFDM symbol,   wherein a second subcarrier spacing of the type-2 OFDM symbol is Δf 2 , and   wherein Δf 1  is unequal to Δf 2 .   
     
     
         2 . The method according to  claim 1 , wherein N is a positive integer, and N is a maximum quantity of type-1 OFDM symbols comprised in the time unit after the second time length occupied by one type-2 OFDM symbol is subtracted. 
     
     
         3 . The method according to  claim 1 , wherein the GP is used to prevent the sent type-1 OFDM symbols and a type-2 OFDM symbol sent by a second terminal from overlapping on a time-frequency resource. 
     
     
         4 . The method according to  claim 1 , wherein
 both a third time length occupied by a cyclic prefix (CP) of each of the N type-1 OFDM symbols and a fourth time length occupied by a CP of the type-2 OFDM symbol are greater than or equal to a preset threshold.   
     
     
         5 . The method according to  claim 1 , wherein a time length of the time unit is 2 millisecond, Δf 1 =3.75 kHz, and Δf 2 =15 kHz; and
 the frame structure is a first frame structure that comprises seven type-1 OFDM symbols and the GP. 
 
     
     
         6 . The method according to  claim 1 , wherein a time length of the time unit is 1 millisecond, Δf 1 =3.75 kHz, and Δf 2 =15 kHz; and
 the frame structure is a second frame structure that comprises three type-1 OFDM symbols and the GP. 
 
     
     
         7 . The method according to  claim 1 , the sending step comprising:
 scheduling, by the base station, the first subcarrier spacing used by the terminal to send uplink data.   
     
     
         8 . A base station, comprising:
 at least one processor; and   a computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions that, when executed by the at least one processor, facilitate performing a method comprising:   indicating a first subcarrier spacing to a terminal, wherein the first subcarrier spacing is used by the terminal to determine a frame structure; and   receiving an N type-1 orthogonal frequency division multiplexing (OFDM) symbols generated by the terminal based on the frame structure in a time unit,   wherein the frame structure indicates that the N type-1 OFDM symbols and a guard period (GP) are comprised in the time unit,   wherein the first subcarrier spacing of each type-1 OFDM symbol is Δf 1 ,   wherein a first time length of the GP is greater than a second time length occupied by one type-2 OFDM symbol,   wherein a second subcarrier spacing of the type-2 OFDM symbol is Δf 2 , and   wherein Δf 1  is unequal to Δf 2 .   
     
     
         9 . The base station according to  claim 8 , wherein N is a positive integer, and N is a maximum quantity of type-1 OFDM symbols comprised in the time unit after the second time length occupied by one type-2 OFDM symbol is subtracted. 
     
     
         10 . The base station according to  claim 8 , wherein the GP is used to prevent the sent type-1 OFDM symbols and a type-2 OFDM symbol sent by a second terminal from overlapping on a time-frequency resource. 
     
     
         11 . The base station according to  claim 8 , wherein both a third time length occupied by a cyclic prefix (CP) of each of the N type-1 OFDM symbols and a fourth time length occupied by a CP of the type-2 OFDM symbol are greater than or equal to a preset threshold. 
     
     
         12 . The base station according to  claim 8 , wherein a time length of the time unit is 2 millisecond, Δf 1 =3.75 kHz, and Δf 2 =15 kHz; and
 the frame structure is a first frame structure that comprises seven type-1 OFDM symbols and the GP. 
 
     
     
         13 . The base station according to  claim 8 , wherein a time length of the time unit is 1 millisecond, Δf1=3.75 kHz, and Δf2=15 kHz; and
 the frame structure is a second frame structure that comprises three type-1 OFDM symbols and the GP. 
 
     
     
         14 . The base station according to  claim 8 , wherein the programming further includes instructions to facilitate further performing:
 scheduling the first subcarrier spacing used by the terminal to send uplink data.   
     
     
         15 . A non-transitory storage medium comprising instructions that, when executed by a computer, cause the computer to carry out a method comprising:
 indicating a first subcarrier spacing to a terminal, wherein the first subcarrier spacing is used by the terminal to determine a frame structure; and   receiving an N type-1 orthogonal frequency division multiplexing (OFDM) symbols generated by the terminal based on the frame structure in a time unit,   wherein the frame structure indicates that the N type-1 OFDM symbols and a guard period (GP) are comprised in the time unit,   wherein the first subcarrier spacing of each type-1 OFDM symbol is Δf 1 ,   wherein a first time length of the GP is greater than a second time length occupied by one type-2 OFDM symbol,   wherein a second subcarrier spacing of the type-2 OFDM symbol is Δf 2 , and   wherein Δf 1  is unequal to Δf 2 .   
     
     
         16 . The non-transitory storage medium according to  claim 15 , wherein N is a positive integer, and N is a maximum quantity of type-1 OFDM symbols comprised in the time unit after the second time length occupied by one type-2 OFDM symbol is subtracted. 
     
     
         17 . The non-transitory storage medium according to  claim 15 , wherein the GP is used to prevent the sent type-1 OFDM symbols and a type-2 OFDM symbol sent by a second terminal from overlapping on a time-frequency resource. 
     
     
         18 . The non-transitory storage medium according to  claim 15 , wherein a time length of the time unit is 2 millisecond, Δf 1 =3.75 kHz, and Δf 2 =15 kHz; and
 the frame structure is a first frame structure that comprises seven type-1 OFDM symbols and the GP. 
 
     
     
         19 . The non-transitory storage medium according to  claim 15 , wherein a time length of the time unit is 1 millisecond, Δf1=3.75 kHz, and Δf2=15 kHz; and
 the frame structure is a second frame structure that comprises three type-1 OFDM symbols and the GP. 
 
     
     
         20 . The non-transitory storage medium according to  claim 15 , wherein when the instructions are executed by the computer, cause the computer to further perform:
 scheduling the first subcarrier spacing used by the terminal to send uplink data.