Multicast transmission for asynchronous data requests
AssigneeKorea Advanced Institute of Science and Technology
InventorsWan CHOI, Hojin SONG
Life of this patent
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Abstract
Provided is a non-orthogonal multicast transmission for asynchronous data requests. In a multicast transmission method of multicasting data to a plurality of user devices belonging to a base station, the method may include: receiving a request for transmitting a file from user device 1 belonging to the base station; unicasting the requested file to the user device 1; receiving a request for transmitting the file unicast to the user device 1 from user device 2 belonging to the base station; and switching to multicast and multicasting the file after unicasting the file to the user device 1 and the user device 2 for a certain time.
Claims20
A multicast transmission method performed by a base station, the method comprising:
- receiving, by a file request reception unit, a request for transmitting a file from a first user device at a first time point;
- receiving, by the file request reception unit, a request for transmitting the file from a second user device at a second time point after receiving the request for transmitting the file from the first user device;
- transmitting, by a unicast control unit, the file to the first user device in a first period between the first time point and the second time point;
- transmitting, by the unicast control unit, the file to each of the first user device and the second user device via unicast transmission in a second period between the second time point and a third time point when a transmission amount of the file transmitted to the first user device becomes equal to a transmission amount of the file transmitted to the second user device;
- and
- transmitting, by a multicast control unit, the file to the first user device and the second user device via multicast transmission from the third time point.
A multicast transmission system including a base station, the system comprising:
- a file request reception unit for receiving a request for transmitting a file from a first user device at a first time point, and receiving a request for transmitting the file from a second user device at a second time point after receiving the request for transmitting the file from the first user device;
- a unicast control unit for transmitting the file to the first user device in a first period between the first time point and the second time point, and transmitting the file to each of the first user device and the second user device via unicast transmission in a second period between the second time point and a third time point when a transmission amount of the file transmitted to the first user device becomes equal to a transmission amount of the file transmitted to the second user device;
- and
- a multicast control unit for transmitting the file to the first user device and the second user device via multicast transmission from the third time point.
Dependencies are inferred from the claim text.