Method for selecting RACH in a CDMA mobile communication system
First Claim
1. A method for selecting a random access channel (RACH) scrambling code from a plurality of scrambling codes by a (user equipment) UE in a CDMA (Code Division Multiple Access) mobile communication system including a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network), comprising the steps of:
- transmitting information for a plurality of scrambling codes having serial numbers associated with random access channels (RACHs) from the UTRAN to the UEs; and
selecting a scrambling code from a plurality of scrambling codes by a UE (User Equipment), wherein each UE selects the scrambling code from the plurality of scrambling codes using a unique identifier specified by each of the plurality of UEs.
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Accused Products
Abstract
A method selecting a RACH comprises determining an access service class (ASC) associated with a unique access class of a user equipment (UE) by analyzing a radio resource control (RRC) message received from a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network); receiving mapping information from the UTRAN; analyzing ASCs and scrambling codes to be used for available RACHs associated with each of the ASCs based on the received mapping information; mapping the analyzed scrambling codes to scrambling code groups associated with the ASCs; selecting a scrambling code group associated with the determined ASC; and selecting one of the scrambling codes using a total number of the scrambling codes mapped to the selected scrambling code group and a unique identifier of the UE.
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Citations
17 Claims
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1. A method for selecting a random access channel (RACH) scrambling code from a plurality of scrambling codes by a (user equipment) UE in a CDMA (Code Division Multiple Access) mobile communication system including a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network), comprising the steps of:
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transmitting information for a plurality of scrambling codes having serial numbers associated with random access channels (RACHs) from the UTRAN to the UEs; and
selecting a scrambling code from a plurality of scrambling codes by a UE (User Equipment), wherein each UE selects the scrambling code from the plurality of scrambling codes using a unique identifier specified by each of the plurality of UEs. - View Dependent Claims (2, 3, 4, 5)
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6. A method for selecting a random access channel (RACH), comprising the steps of:
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receiving RACH system information message from a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network), and determining a total number of RACHs available in a cell depending on the received RACH system information; and
selecting a scrambling code for one of the RACHs using the determined total number of the RACHs and a unique identifier of a user equipment (UE). - View Dependent Claims (7, 8, 9, 10)
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11. A method selecting a random access channel (RACH), comprising the steps of:
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determining an access service class (ASC) associated with a unique access class of a user equipment (UE) by analyzing a radio resource control (RRC) message received from a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network);
receiving mapping information message between the ASC and PRACH from the UTRAN and analyzing ASCs and scrambling codes to be used for available RACHs associated with each of the ASCs based on the received mapping information;
mapping the analyzed scrambling codes to scrambling code groups associated with the ASCs;
selecting a scrambling code group associated with the determined ASC; and
selecting one of the scrambling codes using a total number of the scrambling codes mapped to the selected scrambling code group and a unique identifier of the UE. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for selecting a scrambling code from a plurality of scrambling codes by a UE (user equipment) in a CDMA (Code Division Multiple Access) mobile communication system including a UTRAN (UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network), and transmitting a i plurality of scrambling codes having serial numbers associated with RACHs (random access channel) from the UTRAN to the plurality of UEs, comprising the steps of:
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determining a persistence value by substituting a persistence level provided from the UTRAN to each UE, said persistence value defined by Pi=2−
(k—
1);
determining a value R between 0 and 1;
determining whether the persistence value is larger than or equal to the value R; and
if the persistence value is larger than or equal to the value R, selecting a scrambling code by the UE by using the value R, a unique identifier of each UE and a total number of the scrambling codes (maxPRACH), wherein the selected scrambling code is defined by;
PRACH#=(└
R×
8┘
×
maxPRACH)% maxPRACH.
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Specification