Data transmission method, terminal, and base station in LAA-LTE system
地域：
Guangdong
摘要
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.
說(shuō)明書
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This application is a continuation of U.S. patent application Ser. No. 16/233,558, filed on Dec. 27, 2018, which is a continuation of U.S. patent application Ser. No. 15/968,964, filed on May 2, 2018, which is a continuation of International Application No. PCT/CN2015/095214, filed on Nov. 20, 2015, which claims priority to International Patent Application No. PCT/CN2015/094066, filed on Nov. 6, 2015. All of the afore-mentioned patent applications are hereby incorporated by reference in their entireties.
The present invention relates to the field of communications technologies, and in particular, to an LTE system working on an unlicensed frequency band.
In a wireless communications network, devices need to use a frequency resource to transmit information. The frequency resource is also referred to as a spectrum or a frequency band. The frequency band may include an authorized frequency band and an unauthorized frequency band. The unauthorized frequency band is also referred to as an unlicensed frequency band. The authorized frequency band is a dedicated frequency resource of some operators. The unlicensed frequency band is a common frequency resource in the wireless communications network. With the development of communications technologies, an increasing amount of information is transmitted in the wireless communications network. Transmitting information by using the unlicensed frequency band can improve a data throughput in the wireless communications network and better meet user requirements.
權(quán)利要求
What is claimed is:1. A control information receiving method, comprising:receiving, by a user equipment, a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; and determining, by the user equipment, a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 2. The method according to claim 1 , the method further comprising:detecting, by the user equipment, the control information on at least one of a control data channel or a service data channel of the first cell. 3. The user equipment according to claim 1 , the control information further indicating the downlink data transmission length of the first subframe is less than the first threshold. 4. The method according to claim 1 , wherein the first threshold is a value greater than or equal to 1 millisecond (ms). 5. 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. 6. A control information sending method, comprising:sending, by an access network device, a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; and determining, by the access network device, a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 7. The method according to claim 6 , the method further comprising:sending, by the access network device, the control information on at least one of a control data channel or a service data channel of the first cell. 8. The method according to claim 6 , the control information further indicating the downlink data transmission length of the first subframe is less than the first threshold. 9. The method according to claim 6 , wherein the first threshold is a value not less than 1 millisecond (ms). 10. The method according to claim 6 , 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. 11. A user equipment comprising:a receiver, configured to receive a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; and a processor coupled to the receiver and configured to determine a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 12. The user equipment according to claim 11 , the receiver further configured to receive the control information on at least one of a control data channel or a service data channel of the first cell. 13. The user equipment according to claim 11 , the control information further indicating the downlink data transmission length of the first subframe is less than the first threshold. 14. The user equipment according to claim 11 , wherein the first threshold is a value greater than or equal to 1 millisecond (ms). 15. The user equipment 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. 16. An access network device, the access network device comprising:a transmitter configured to send a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; a processor coupled to the transmitter and configured to determine a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 17. The access network device according to claim 16 , wherein the transmitter is further configured to send the control information on at least one of a control data channel or a service data channel of the first cell. 18. The access network device according to claim 16 , wherein the transmitter is further configured to send control information, the control information indicating that the downlink data transmission length of the first subframe is less than the first threshold. 19. The access network device according to claim 16 , wherein the first threshold is a value greater than or equal to 1 millisecond (ms). 20. The access network device according to claim 16 , 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. 21. A non-transitory computer-readable media storing computer instructions that when executed by one or more processors, cause the one or more processors to perform the steps of:receiving, by a user equipment, a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; and determining, by the user equipment, a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 22. The non-transitory computer-readable media according to claim 11 , wherein the steps further comprising:detecting, by the user equipment, the control information on at least one of a control data channel or a service data channel of the first cell. 23. The non-transitory computer-readable media according to claim 21 , the control information further indicating the downlink data transmission length of the first subframe is less than the first threshold. 24. The non-transitory computer-readable media according to claim 21 , wherein the first threshold is a value greater than or equal to 1 millisecond (ms). 25. The non-transitory computer-readable media according to claim 21 , 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. 26. A non-transitory computer-readable media storing computer instructions that when executed by one or more processors, cause the one or more processors to perform the steps of:sending, by an access network device, a control information of a first cell, the control information indicating a first subframe in the first cell, a downlink data transmission length of the first subframe being less than a first threshold; and determining, by the access network device, a last OFDM symbol of a first slot included in the first subframe does not include a primary synchronization signal and a second to last OFDM symbol of a first slot included in the first subframe does not include a secondary synchronization signal, when the first subframe is a first subframe in a radio frame or a sixth subframe in a radio frame, when a downlink data transmission configuration of the first cell is a normal cyclic prefix, and when the downlink data transmission length of the first subframe is less than 12 orthogonal frequency-division multiplexing (OFDM) symbols. 27. The non-transitory computer-readable media according to claim 26 , the steps further comprising:sending, by the access network device, the control information on at least one of a control data channel or a service data channel of the first cell. 28. The non-transitory computer-readable media according to claim 26 , the control information further indicating the downlink data transmission length of the first subframe is less than the first threshold. 29. The non-transitory computer-readable media according to claim 26 , wherein the first threshold is a value not less than 1 millisecond (ms). 30. The non-transitory computer-readable media according to claim 26 , 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.
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