Random access method and related apparatus
A user equipment receives first signaling from a base station through a physical downlink shared channel (PDSCH), and receives second signaling from the base station through a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH), where the first signaling includes a first time division duplexing TDD uplink-downlink configuration, and the second signaling includes a second TDD uplink-downlink configuration; the user equipment determines, according to the first TDD uplink-downlink configuration, an uplink subframe for sending a random access message; and the user equipment sends the random access message to the base station in the determined uplink subframe.
1. A method comprising:
sending, by a base station, first signaling to a terminal device through a physical downlink shared channel (PDSCH), and sending, by the base station, second signaling to the terminal device through a downlink control channel, wherein the first signaling comprises a first time division duplexing (TDD) uplink-downlink configuration, the second signaling comprises a second TDD uplink-downlink configuration, and the downlink control channel is a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH);
when both the first signaling and the second signaling are sent to the terminal device, receiving, by the base station, random access message from the terminal device in a first uplink subframe within a first uplink subframe set of the first TDD uplink-downlink configuration; and
when both the first signaling and the second signaling are sent to the terminal device, after the terminal device accesses the base station,
receiving, by the base station from the terminal device, data in a second uplink subframe within a second uplink subframe set of the second TDD uplink-downlink configuration or
sending, by the base station to the terminal device, data in a first downlink subframe within a downlink subframe set of the second TDD uplink-downlink configuration.
2. The method according to claim 1 , before receiving the random access message, further comprising:
receiving, by the base station from the terminal device, a preamble on a third uplink subframe within the first uplink subframe set of the first TDD uplink-downlink configuration.
3. The method according to claim 2 , before receiving the preamble, further comprising:
sending, by the base station on a second downlink subframe set of the first TDD uplink-downlink configuration, a PDCCH Order or an ePDCCH Order.
4. The method according to claim 1 , before receiving the random access message, further comprising:
sending, by the base station on a second downlink subframe set of the first TDD uplink-downlink configuration, downlink control information (DCI) through the PDCCH or the ePDCCH, wherein the DCI is scrambled by a random access-radio network temporary identifier (RA-RNTI).
5. The method according to claim 1 , after receiving the random access message, further comprising:
sending, by the base station on a third downlink subframe within a second downlink subframe set of the first TDD uplink-downlink configuration, a contention resolution message.
6. The method according to claim 1 , wherein the first signaling is a system information block.
7. The method according to claim 1 , wherein the terminal device is a downlink-uplink interference management and traffic adaptation (eIMTA) user equipment.
8. An apparatus comprising:
a storage medium including executable instructions; and
a processor, wherein the executable instructions, when executed by the processor, cause the apparatus to:
send first signaling to a terminal device through a physical downlink shared channel (PDSCH), and send second signaling to the terminal device through a downlink control channel, wherein the first signaling comprises a first time division duplexing (TDD) uplink-downlink configuration, the second signaling comprises a second TDD uplink-downlink configuration, and the downlink control channel is a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH);
when both the first signaling and the second signaling are sent to the terminal device, receive random access message from the terminal device in a first uplink subframe within a first uplink subframe set of the first TDD uplink-downlink configuration; and
when both the first signaling and the second signaling are sent to the terminal device, after the terminal device accesses a base station,
receive, data sent from the terminal device in a second uplink subframe within a second uplink subframe set of the second TDD uplink-downlink configuration or
send, to the terminal device, data in a first downlink subframe within a downlink subframe set of the second TDD uplink-downlink configuration.
9. The apparatus according to claim 8 , wherein the executable instructions, when executed by the processor, further cause the apparatus to:
before receiving the random access message, receive, from the terminal device, a preamble on a third uplink subframe within the first uplink subframe set of the first TDD uplink-downlink configuration.
10. The apparatus according to claim 9 , wherein the executable instructions, when executed by the processor, further cause the apparatus to:
before receiving the preamble, send, on a second downlink subframe set of the first TDD uplink-downlink configuration, a PDCCH Order or an ePDCCH Order.
11. The apparatus according to claim 8 , wherein the executable instructions, when executed by the processor, further cause the apparatus to:
before receiving the random access message, send, on a second downlink subframe set of the first TDD uplink-downlink configuration, downlink control information (DCI) through the PDCCH or the ePDCCH, wherein the DCI is scrambled by a random access-radio network temporary identifier (RA-RNTI).
12. The apparatus according to claim 8 , wherein the executable instructions, when executed by the processor, further cause the apparatus to:
after receiving the random access message, send, on a third downlink subframe within a second downlink subframe set of the first TDD uplink-downlink configuration, a contention resolution message.
13. The apparatus according to claim 8 , wherein the first signaling is a system information block.
14. The apparatus according to claim 8 , wherein the terminal device is a downlink-uplink interference management and traffic adaptation (eIMTA) user equipment.
15. A non-transitory computer-readable medium storing computer instructions that, when executed by one or more hardware processors, cause the one or more hardware processors to:
send first signaling to a terminal device through a physical downlink shared channel (PDSCH), and send second signaling to the terminal device through a downlink control channel, wherein the first signaling comprises a first time division duplexing (TDD) uplink-downlink configuration, the second signaling comprises a second TDD uplink-downlink configuration, and the downlink control channel is a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH);
when both the first signaling and the second signaling are sent to the terminal device, receive random access message from the terminal device in a first uplink subframe within a first uplink subframe set of the first TDD uplink-downlink configuration; and
when both the first signaling and the second signaling are sent to the terminal device, after the terminal device accesses a base station,
receive, data sent from the terminal device in a second uplink subframe within a second uplink subframe set of the second TDD uplink-downlink configuration or
send, to the terminal device, data in a first downlink subframe within a downlink subframe set of the second TDD uplink-downlink configuration.
16. The non-transitory computer-readable medium according to claim 15 , wherein the computer instructions that, when executed by one or more hardware processors, further cause the one or more hardware processors to:
before receiving the random access message, receive a preamble on a third uplink subframe within the first uplink subframe set of the first TDD uplink-downlink configuration.
17. The non-transitory computer-readable medium according to claim 16 , wherein the computer instructions that, when executed by one or more hardware processors, further cause the one or more hardware processors to:
before receiving the preamble, send, on a second downlink subframe set of the first TDD uplink-downlink configuration, a PDCCH Order or an ePDCCH Order.
18. The non-transitory computer-readable medium according to claim 15 , wherein the computer instructions that, when executed by one or more hardware processors, further cause the one or more hardware processors to:
before receiving the random access message, send, on a second downlink subframe set of the first TDD uplink-downlink configuration, downlink control information (DCI) through the PDCCH or the ePDCCH, wherein the DCI is scrambled by a random access-radio network temporary identifier (RA-RNTI).
19. The non-transitory computer-readable medium according to claim 15 , wherein the computer instructions that, when executed by one or more hardware processors, further cause the one or more hardware processors to:
after receiving the random access message, send, on a third downlink subframe within a second downlink subframe set of the first TDD uplink-downlink configuration, a contention resolution message.
20. The non-transitory computer-readable medium according to claim 15 , wherein the first signaling is a system information block.