METHOD OF CHANGING TRANSMISSION MODE, METHOD OF REQUESTING PACKET RETRANSMISSION, AND METHOD OF RETRANSMITTING PACKET
First Claim
1. A method of changing a transmission mode by a terminal for receiving a data packet of a broadcasting or multicast service, the method comprising:
- taking allocation of a random access channel so as to transmit channel information corresponding to the broadcasting or multicast service;
measuring a received signal quality by using a pilot signal included in the data packet;
determining whether a change of transmission mode is necessary based on the received signal quality; and
transmitting channel information for requesting the change of the transmission mode through the random access channel, when the change of the transmission mode is necessary.
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Accused Products
Abstract
The present invention is directed to a method of changing a transmission mode, a method of requesting a packet retransmission, and a method of retransmitting a packet with respect to a broadcasting or multicast service. According to the invention, a plurality of terminals provided with one broadcasting or multicast service shares one random access channel (RACH) so as to transmit channel information. Accordingly, a base station receives the channel information through one RACH from the terminal or detects a packet collision generated in the RACH to confirm a request for changing the transmission mode or a request for maintaining the transmission mode by the terminal.
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Citations
31 Claims
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1. A method of changing a transmission mode by a terminal for receiving a data packet of a broadcasting or multicast service, the method comprising:
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taking allocation of a random access channel so as to transmit channel information corresponding to the broadcasting or multicast service; measuring a received signal quality by using a pilot signal included in the data packet; determining whether a change of transmission mode is necessary based on the received signal quality; and transmitting channel information for requesting the change of the transmission mode through the random access channel, when the change of the transmission mode is necessary. - View Dependent Claims (3, 6, 8, 12)
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2. A method of changing a transmission mode by a terminal for receiving a data packet of a broadcasting or multicast service, the method comprising:
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taking allocation of a random access channel so as to transmit channel information corresponding to the broadcasting or multicast service; receiving a message for changing the transmission mode; determining whether a change of transmission mode is suitable based on a received signal quality of the data packet; and transmitting a request for maintaining the transmission mode through the random access channel, when the change of the transmission mode is not suitable. - View Dependent Claims (11, 13)
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4. (canceled)
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5. (canceled)
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7. (canceled)
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9. (canceled)
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10. (canceled)
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14. A method of changing a transmission mode by a base station for providing a broadcasting or multicast service, the method comprising:
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allocating a channel to at least one terminal so as to receive a channel information packet corresponding to the broadcasting or multicast service; confirming whether a packet is transmitted through the channel from the at least one terminal; and changing a transmission mode corresponding to the broadcasting or multicast service, when the packet is transmitted through the channel. - View Dependent Claims (15, 16, 18)
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17. (canceled)
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19. A method of changing a transmission mode by a base station for providing a broadcasting or multicast service, the method comprising:
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requesting a change of a transmission mode, when a request for changing the transmission mode is not transmitted from at least one terminal provided with the broadcasting and multicast service during a predetermined time; maintaining a transmission mode corresponding to the broadcasting or multicast service, when a response is transmitted from the at least one terminal depending on the request for changing the transmission mode; and changing the transmission mode, when the number of requests for changing the transmission mode is not less than a predetermined number. - View Dependent Claims (20, 21)
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22. (canceled)
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23. (canceled)
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24. (canceled)
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25. (canceled)
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26. (canceled)
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27. A method of requesting a packet retransmission by a terminal provided with a broadcasting or multicast service, the method comprising:
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taking allocation of a random access channel so as to transmit a request for packet retransmission; confirming whether an error-packet exists in data packets received depending on the broadcasting or multicast service; and transmitting the request for the packet retransmission by using the random access channel, when the error-packet exists. - View Dependent Claims (28, 29)
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30. A method of retransmitting a packet by a base station provided with a broadcasting or multicast service, the method comprising:
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allocating a channel so as to receive a request for retransmitting the packet; retransmitting a packet corresponding to the request for retransmitting the packet, when the request for retransmitting the packet is received through the channel; and retransmitting all packets transmitted during a present feedback interval of the broadcasting or multicast service, when a packet collision is generated in the channel. - View Dependent Claims (31)
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Specification