Random access in a mobile telecommunications system
DCFirst Claim
1. A method for improving the performance of a random access mobile communications system, comprising the steps of:
- a mobile station transmitting a random access request, said random access request comprising a preamble, said preamble being dependent on a signature pattern randomly selected from a set of patterns; and
a base station detecting a presence of said random access request, generating an indicator signal indicating said presence of said random access request, and transmitting said indicator signal to the mobile station prior to decoding of the random access request, wherein said indicator signal is associated with the selected signature.
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Abstract
A method for processing multiple random access requests is disclosed in which a base station transmits an acquisition indicator signal, which indicates that the base station has detected the presence of a random access transmission. The acquisition indicator can be generated based on the amount of energy received on the random access channel (e.g., as opposed to the correct/incorrect decoding of a random access message). Consequently, the delay between the beginning of the random access transmission and the beginning of the acquisition indicator transmission is significantly shorter than the delay to the beginning of an acknowledgment transmission based on the reception of a correctly decoded random access message. If a mobile station does not receive a positive acquisition indicator, it should interrupt the present transmission and start to re-transmit the random access burst in the next time slot, while modifying the transmission power level accordingly between the successive re-transmissions.
21 Citations
57 Claims
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1. A method for improving the performance of a random access mobile communications system, comprising the steps of:
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a mobile station transmitting a random access request, said random access request comprising a preamble, said preamble being dependent on a signature pattern randomly selected from a set of patterns; and a base station detecting a presence of said random access request, generating an indicator signal indicating said presence of said random access request, and transmitting said indicator signal to the mobile station prior to decoding of the random access request, wherein said indicator signal is associated with the selected signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A random access communications system, comprising:
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a mobile station, said mobile station including means for transmitting a random access request, said random access request comprising a preamble, said preamble being dependent on a signature pattern randomly selected from a set of patterns; and a base station coupled to said mobile station via an air interface, said base station configured to detect a presence of said random access request, generating an indicator signal indicating said presence of said random access request, and transmit said indicator signal to the mobile station prior to decoding of the random access request, wherein said indicator signal is associated with the selected signature. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for improving the performance of a random access mobile communications system, said method comprising the steps of:
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transmitting, by a mobile station, a random access request comprising a preamble, said preamble being dependent on a signature pattern randomly selected from a set of patterns; detecting, by a base station, a presence of a random access request, prior to decoding of the random access request; generating an acquisition indicator signal indicating the presence of the random access request, wherein said indicator signal is associated with the selected signature; and transmitting, by the base station, the acquisition indicator signal to the mobile station. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. A base station within a mobile communication system comprising:
a detection section for detecting the presence of a random access transmission from a mobile station, said random access transmission comprising a preamble, said preamble being dependent on a signature pattern randomly selected from a set of patterns; and
wherein said base station is configured to generate an acquisition indicator indicating said presence of the random access transmission, wherein said indicator signal is associated with the selected signature, and transmit the acquisition indicator signal to the mobile station prior to decoding of the random access transmission.- View Dependent Claims (49, 50, 51, 52)
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53. A method in a mobile station for performing random access in a mobile communication system, the method comprising the steps of:
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transmitting a preamble part of a random access request, said preamble being dependent on a signature pattern randomly selected from a set of patterns; receiving an indicator signal associated with the selected signature and indicating that a base station has detected a presence of said random access request prior to decoding of the random access request; transmitting a message part of the random access request in response to receiving said indicator signal. - View Dependent Claims (54, 55, 56, 57)
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Specification