Random access channel access apparatus for mobile satellite communication system and method therefor
First Claim
1. A method for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to a satellite access network, comprising the steps of:
- a) receiving a preamble and a message transmitted successively from the mobile station; and
b) transmitting an acquisition indicator (AI) signal for the preamble and the message to the mobile station.
1 Assignment
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Accused Products
Abstract
The present invention relates to Random Access Channel (RACH) access apparatus for mobile satellite communication system and method therefor. The method for accessing random access channel (RACH) on satellite system, random access channel (RACH) carrying message from a plurality of mobile stations to the satellite system, the method includes the steps of: receiving preamble and the message, the message successively transmitted with the preamble from the plurality of mobile stations; and transmitting acquisition response signal corresponding to the preamble or the message to the plurality of mobile stations. Accordingly, success of packet reception of satellite system is improved and transmission delay is reduced.
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Citations
57 Claims
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1. A method for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to a satellite access network, comprising the steps of:
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a) receiving a preamble and a message transmitted successively from the mobile station; and b) transmitting an acquisition indicator (AI) signal for the preamble and the message to the mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to a satellite access network, comprising the steps of:
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a) transmitting a preamble and a message successively to the satellite access network; b) receiving an acquisition indicator (AI) signal for the preamble or the message from the satellite access network; and c) retransmitting the preamble or the message based on the AI signal, or waiting for a response for the message. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A mobile station for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to a satellite access network, the mobile station comprising:
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a transmission resource determination means for selecting an access frame for transmitting a message and a preamble having a plurality of sub-preambles, a sub-access frame among the sub-access frames into which the access frame is divided, a transmission time offset, a signature code for generating the preamble and a spreading code corresponding to the selected sub-access frame and the selected RACH; a generation means for modulating the preamble and the message suitable to be transmitted to the RACH by using the signature code and the spreading code determined in the transmission resource determination means; a transceiver means for transmitting the preamble and the message successively after the selected transmission time offset is passed from the starting point of the access frame or the sub-access frame, and for receiving acquisition indicator (AI) signals corresponding to the preamble and the message; and a transmission determination means for determining whether to retransmit the preamble and the message or wait for a response to the message according to the received AI signals.
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55. A satellite access network for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to the satellite access network, the satellite access network comprising:
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a transceiver means for receiving a preamble and a message that are transmitted successively from the plurality of mobile stations; and an acquisition indicator (AI) signal for generating an positive AI signal including the acquisition indication information of the preamble and the message, or a negative AI signal including information that the use of the RACH through which the preamble and the message is not permitted currently.
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56. A random access channel (RACH) access apparatus of a mobile station, for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to a satellite access network, the apparatus comprising:
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a transmission resource determination means for selecting an access frame for transmitting a message and a preamble having a plurality of sub-preambles, a sub-access frame among sub-access frames into which the access frame is divided, a transmission time offset, a signature code for generating the preamble and a spreading code corresponding to the selected sub-access frame and the selected RACH; a generation means for modulating the preamble and the message suitable to be transmitted to the RACH by using the signature code and the spreading code determined in the transmission resource determination means; a transceiver means for transmitting the preamble and the message successively after the selected transmission time offset from the starting point of the access frame or the sub-access frame, and for receiving acquisition indicator (AI) signals for the transmitted preamble and the message; and a transmission determination means for determining whether to retransmit the preamble and the message or wait for a response to the message according to the received AI signals.
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57. A random access channel (RACH) access apparatus of a satellite access network, for accessing a random access channel (RACH) through which a plurality of mobile stations transmit messages to the satellite access network, the apparatus comprising:
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transceiver means for receiving a preamble and a message that are transmitted successively from the plurality of mobile stations; and an acquisition indicator (AI) signal for generating an positive AI signal including acquisition indication information of the preamble and the message, or a negative AI signal including information that the use of the RACH through which the preamble and the message is not permitted.
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Specification