Methods for performing multi-subframe scheduling in enhanced LAA
A method which allows an evolved node B (eNB) to perform multi-subframe scheduling in enhanced license assisted access (eLAA) is provided. The eNB determining the subframes in a maximum channel occupancy time (MCOT) within which uplink transmission is performed. The eNB schedules resources for uplink transmission by user equipments (UEs) within the determined subframes. The UEs receive index values associated with a first subframe and a last subframe, in the determined subframes from the eNB. The first subframe and last subframe may be within a single, or multiple MCOTs. The UEs perform uplink transmission between the first subframe and the last subframe. The method allows forming a group with the plurality of UEs. A group identity, broadcast by the eNB, is received by the UEs. The method allows scheduling beams for performing uplink transmission by the UEs in 5 th generation (5G) systems and scheduling multiple UEs while accounting spectral emissions.
1. A method performed by a base station in a wireless communication system supporting a licensed assisted access (LAA), the method comprising:
identifying a listen before talk (LBT) type for a terminal;
transmitting, to the terminal, downlink control information (DCI) scheduling of a physical uplink shared channel (PUSCH) in a plurality of subframes in an LAA cell, the DCI including first information on the LBT type, second information for a timing offset for a PUSCH transmission, third information for a number of the plurality of subframes for the PUSCH transmission and fourth information for a starting position of the PUSCH transmission; and
receiving, from the terminal, uplink data based on an LBT procedure of the terminal which is performed based on the DCI,
wherein, in case that the LBT procedure performed in a first subframe based on the LBT type indicated by the first information fails, the LBT procedure is performed in a second subframe which is subsequent to the first subframe based on the LBT type indicated by the first information.
2. The method of claim 1 ,
wherein the LBT procedure is performed in a symbol of the first subframe based on the LBT type indicated by the first information, the first subframe is identified based on the second information and the symbol being is based on the fourth information,
wherein the second subframe is within the plurality of subframes identified based on the third information,
wherein the number of the plurality of subframes are less than or equal to a number associated with a maximum channel occupancy time (MCOT) for the terminal, and
wherein the first subframe and the second subframe are within the MCOT.
3. The method of claim 1 ,
wherein the LBT type includes at least one of a first type or a second type,
wherein the first type LBT is performed for a random backoff time within a contention window, and
wherein the second type LBT is performed for a fixed duration of 25 us.
4. The method of claim 1 ,
wherein the timing offset indicates a subframe offset between a subframe in which the DCI is transmitted and a subframe for the PUSCH transmission.
5. The method of claim 1 , further comprising:
forming a group with a plurality of terminals;
associating each terminal of the plurality of terminals in the group based on information corresponding to a signaling parameter;
determining an absence of interference in a proximity of the base station by performing a downlink LBT procedure; and
scheduling subframes for an uplink transmission for the plurality of terminals based on a priority of the plurality of terminals,
wherein the signaling parameter includes at least one of a received signal strength (RSSI), an angle of arrival (AOA), a direction of arrival (DOA) or a timing alignment value (TAV).
6. A method performed by a terminal in a wireless communication system supporting a licensed assisted access (LAA), the method comprising:
receiving, from a base station, downlink control information (DCI) scheduling of a physical uplink shared channel (PUSCH) in an plurality of subframes in an LAA cell, the DCI including first information on a listen before talk (LBT) type for the terminal, second information for a timing offset for a PUSCH transmission, third information for a number of the plurality of subframes for the PUSCH transmission and fourth information for a starting position of the PUSCH transmission
performing an LBT procedure in a first subframe based on the LBT type indicated by the first information;
performing, in case that the LBT procedure performed in the first subframe fails, an LBT procedure in a second subframe which is subsequent to the first subframe based on the LBT type indicated by the first information; and
transmitting, to the base station, uplink data based on the LBT procedure performed in the second subframe.
7. The method of claim 6 ,
wherein the LBT procedure is performed in a symbol of the first subframe based on the LBT type indicated by the first information, the first subframe is identified based on the second information and the symbol is identified based on the fourth information,
wherein the second subframe is within the plurality of subframes identified based on the third information,
wherein the number of the plurality of subframes are less than or equal to a number associated with a maximum channel occupancy time (MCOT) for the terminal, and
wherein the first subframe and the second subframe are within the MCOT.
8. The method of claim 6 ,
wherein the LBT type includes at least one of a first type or a second type,
wherein the first type LBT is performed for a random backoff time within a contention window, and
wherein the second type LBT is performed for a fixed duration of 25 us.
9. The method of claim 6 , wherein the timing offset indicates a subframe offset between a subframe in which the DCI is received and a subframe for the PUSCH transmission.
10. The method of claim 6 , further comprising:
receiving an identity of a group including a plurality of terminals; and
receiving a priority of uplink transmission allocated by the base station,.
wherein the each terminal of the plurality of terminals in the group is associated based on information corresponding to a signaling parameter,
wherein an absence of interference in a proximity of the base station is determined by a downlink LBT procedure of the base station, and
wherein the signaling parameter includes at least one of a received signal strength (RSSI), an angle of arrival (AOA), a direction of arrival (DOA) or a timing alignment value (TAV).
11. A base station in a wireless communication system supporting a licensed assisted access (LAA), the base station comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
identify a listen before talk (LBT) type for a terminal,
transmit, to the terminal, downlink control information (DCI) scheduling of a physical uplink shared channel (PUSCH) in a plurality of subframes in an LAA cell, the DCI including first information on the LBT type, second information for a timing offset for a PUSCH transmission, third information for a number of the plurality of subframes for the PUSCH transmission and fourth information for a starting position of the PUSCH transmission, and
receive, from the terminal, uplink data based on an LBT procedure of the terminal which is performed based on the DCI,
wherein, in case that the LBT procedure performed in a first subframe based on the LBT type indicated by the first information fails, the LBT procedure is performed in a second subframe which is subsequent to the first subframe based on the LBT type indicated by the first information.
12. The base station of claim 11 ,
wherein the LBT procedure is performed in a symbol of the first subframe based on the LBT type indicated by the first information, the first subframe is identified based on the second information and the symbol is identified based on the fourth information,
wherein the second subframe is within the plurality of subframes identified based on the third information,
wherein the number of the plurality of subframes are less than or equal to a number associated with a maximum channel occupancy time (MCOT) for the terminal, and
wherein the first subframe and the second subframe are within the MCOT.
13. The base station of claim 11 ,
wherein the LBT type includes at least one of a first type or a second type,
wherein the first type LBT is performed for a random backoff time within a contention window, and
wherein the second type LBT is performed for a fixed duration of 25 μs.
14. The base station of claim 11 ,
wherein the timing offset indicates a subframe offset between a subframe in which the DCI is transmitted and a subframe for the PUSCH transmission.
15. The base station of claim 11 , wherein the at least one processor is further configured to:
form a group with a plurality of terminals,
associate each terminal of the plurality of terminals in the group based on information corresponding to a signaling parameter,
determine an absence of interference in a proximity of the base station by performing a downlink LBT procedure, and
schedule subframes for an uplink transmission for the plurality of terminals based on a priority of the plurality of terminals,
wherein the signaling parameter includes at least one of a received signal strength (RSSI), an angle of arrival (AOA), a direction of arrival (DOA) or a timing alignment value (TAV).
16. A terminal in a wireless communication system supporting a licensed assisted access (LAA), the terminal comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
receive, from a base station, downlink control information (DCI) scheduling of a physical uplink shared channel (PUSCH) in an plurality of subframes in an LAA cell, the DCI including first information on a listen before talk (LBT) type for the terminal, second information for a timing offset for a PUSCH transmission, third information for a number of the plurality of subframes for the PUSCH transmission and fourth information for a starting position of the PUSCH transmission,
perform an LBT procedure in a first subframe based on the LBT type indicated by the first information,
perform, in case that the LBT procedure performed in the first subframe fails, an LBT procedure in a second subframe which is subsequent to the first subframe based on the LBT type indicated by the first information, and
transmit, to the base station, uplink data based on the LBT procedure performed in the second subframe.
17. The terminal of claim 16 ,
wherein the LBT procedure is performed in a symbol of the first subframe based on the LBT type indicated by the first information, the first subframe is identified based on the second information and the symbol is identified based on the fourth information,
wherein the second subframe is within the plurality of subframes identified based on the third information,
wherein the number of the plurality of subframes are less than or equal to a number associated with a maximum channel occupancy time (MCOT) for the terminal, and
wherein the first subframe and the second subframe are within the MCOT.
18. The terminal of claim 16 , wherein the LBT type includes at least one of a first type or a second type,
wherein the first type LBT is performed for a random backoff time within a contention window, and
wherein the second type LBT is performed for a fixed duration of 25 us.
19. The terminal of claim 16 , wherein the timing offset indicates a subframe offset between a subframe in which the DCI is received and a subframe for the PUSCH transmission.
20. The terminal of claim 16 , wherein the at least one processor is further configured to:
receive an identity of a group including a plurality of terminals, and
receive a priority of the uplink transmission allocated by the base station,
wherein the each terminal of the plurality of terminals in the group is associated based on information corresponding to a signaling parameter,
wherein an absence of interference in a proximity of the base station is determined by a downlink LBT procedure of the base station, and
wherein the signaling parameter includes at least one of a received signal strength (RSSI), an angle of arrival (AOA), a direction of arrival (DOA) or a timing alignment value (TAV).