Data transmission method, terminal, and base station in LAA-LTE system
The present disclosure relates to example data transmission methods, user equipment, and access network devices in an LAA-LTE system. An example data receiving method includes determining, by user equipment, first information of a first cell. The user equipment determines a first subframe based on the first information, where a downlink data transmission length of the first subframe is less than a first threshold. The user equipment then determines a data transmission characteristic of the cell in the first subframe based on a preset condition, so as to receive, based on the data transmission characteristic, data including the first subframe. In doing so, a data transmission characteristic of a base station or a terminal is standardized, and a reference signal such as a DRS can be correctly identified.
1. A communication method, comprising:
detecting, by a user equipment, control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determining, by the user equipment, (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
2. The method according to claim 1 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in one burst data transmission.
3. A communication method, comprising:
sending, by an access network device, control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determining, by the access network device, (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
4. The method according to claim 3 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in a transmission burst.
5. A communication apparatus, comprising:
at least one processor; and
a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instruct the at least one processor to:
detect control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determine (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, with a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
6. The communication apparatus according to claim 5 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in a transmission burst.
7. A communication apparatus, comprising:
at least one processor; and
a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instruct the at least one processor to:
send control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determine (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, with a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
8. The communication apparatus according to claim 7 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in a transmission burst.
9. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to:
detect control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determine (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, with a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
10. The non-transitory computer-readable storage medium according to claim 9 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in a transmission burst.
11. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to:
send control information of a first cell, the control information indicating occupied orthogonal frequency-division multiplexing (OFDM) symbols in a first subframe; and
determine (i) a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal, and (ii) a second to last OFDM symbol of the first slot included in the first subframe does not include a secondary synchronization signal, the determining occurring when the first subframe is a first subframe in a radio frame or a sixth subframe in the radio frame, a downlink data transmission configuration of the first cell comprises a normal cyclic prefix, and the occupied OFDM symbols in the first subframe are less than 12 OFDM symbols, with a time length of the occupied OFDM symbols in the first subframe being less than a first threshold and the first threshold comprising a value greater than or equal to 1 ms.
12. The non-transitory computer-readable storage medium according to claim 11 , wherein a data transmission start position of the first subframe is on a subframe boundary and the first subframe is a last subframe in a transmission burst.