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Disclosed is a method for synchronizing a scrambling code in a CDMA communication system including a UTRAN (UMTS Terrestrial Radio Access Network) and a plurality of user equipments (UEs), using orthogonal codes for identifying the UEs and a single scrambling code for identifying the UTRAN by the UE

Disclosed is a method for synchronizing a scrambling code in a CDMA communication system including a UTRAN (UMTS Terrestrial Radio Access Network) and a plurality of user equipments (UEs), using orthogonal codes for identifying the UEs and a single scrambling code for identifying the UTRAN by the UEs, and employing an uplink synchronous transmission scheme (USTS) where the UEs synchronize frames of uplink dedicated physical channels (DPCHs) using the single scrambling code. The UEs receive a reference signal including reference time information provided from the UTRAN and transmit a random access channel (RACH) based on the reference time. The UTRAN receives the random access channels from the UEs to measure a propagation delay time (PD) of each random access channel signal from the UEs, and transmits a transmission time adjustment value calculated using the measured propagation delay time and a time offset τDPCH,n between a transmission time point of the reference signal and a transmission time point of a downlink DPCH. Each UE determines a transmission time of the uplink DPCH by receiving the transmission time adjustment value, and scrambles a message with the orthogonal code and a scrambling code generated at the reference time, at the transmission time so determined as to transmit the message over the uplink DPCH.

대표청구항 ▼

What is claimed is: 1. A method for synchronizing a scrambling code in a CDMA (Code Division Multiple Access) communication system including a UTRAN (UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access Network) and a plurality of user equipments (UEs), using orthogonal codes

What is claimed is: 1. A method for synchronizing a scrambling code in a CDMA (Code Division Multiple Access) communication system including a UTRAN (UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access Network) and a plurality of user equipments (UEs), using orthogonal codes for identifying the UEs and a single up-link scrambling code for the UEs to identify the UTRAN, and employing an uplink synchronous transmission scheme (USTS) where the UEs synchronize frames of uplink physical channels using the single scrambling code, wherein the UEs receive a signal providing system timing provided from the UTRAN and transmit a random access channel (RACH) signal based on the system timing, comprising the steps of: receiving, in the UTRAN, the random access channel signal from a UE to measure a propagation delay time (PD) of the UE, and transmitting a transmission time adjustment value calculated using the measured propagation delay time and a time offset τDPCH,n between the system timing and a transmission time point of a downlink dedicated physical channel (DPCH); and determining, in the UE, a transmission time of the uplink physical channel signal by receiving the transmission time adjustment value, and scrambling a frame data with an orthogonal code and a scrambling code generated at a time being different from a generating time of the frame data with a scrambling code offset calculated from the transmission time adjustment value. 2. The method as claimed in claim 1, wherein the system timing is a starting timing of a common pilot channel (CPICH) signal. 3. The method as claimed in claim 1, wherein the system timing is a starting timing of a primary common control physical channel (P-CCPCH) signal. 4. The method as claimed in claim 1, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(τDPCH,n+T o+2*PD) mod 2560description="In-line Formulae" end="tail" where To is a constant value. 5. The method as claimed in claim 1, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=2560-[(τDPCH,n+T o+2*PD) mod 2560]description="In-line Formulae" end="tail" where To is a constant value. 6. The method as claimed in claim 1, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(τDPCH,n+T o+2*PD) mod 256*mdescription="In-line Formulae" end="tail" where To is a constant value, and m=1,2,3, . . . ,10. 7. The method as claimed in claim 1, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(256*m)-[(τDPCH,n +To+2*PD) mod 256*m]description="In-line Formulae" end="tail" where To is a constant value, and m=1,2,3, . . . ,10. 8. The method as claimed in claim 1, wherein the transmission time adjustment value is calculated by subtracting the propagation delay time from a constant value To. 9. The method as claimed in claim 1, wherein the scrambling code offset is calculated by: description="In-line Formulae" end="lead"offset=τ DPCH,n+To+2PD+Ldescription="In-line Formulae" end="tail" where L indicates the transmission time adjustment value. 10. A method for synchronizing a scrambling code in a UE of a CDMA communication system including a UTRAN and a plurality of UEs, using orthogonal codes for identifying the UEs and a single uplink scrambling code for the UEs to identify the UTRAN and employing an uplink synchronous transmission scheme (USTS) where the UEs synchronize frames of uplink physical channels using the single scrambling code, wherein the UEs receive a signal providing system timing provided from the UTRAN and transmit a random access channel (RACH) signal based on the system timing, comprising the steps of: determining a transmission time upon receipt of a transmission time adjustment value for slot synchronization from the UTRAN in response to the transmitted RACH signal; creating a scrambling code at the system timing; creating a data frame at the determined transmission time; and scrambling, at the determined transmission time, the data frame with the scrambling code generated at a time being different from a transmission time of the frame data with a scrambling code offset calculated from the transmission time adjustment value. 11. An apparatus for synchronizing a scrambling code in a UE of a CDMA communication system including a UTRAN and a plurality of UEs, using orthogonal codes for identifying the UEs and a single uplink scrambling code for the UEs to identify the UTRAN, and employing an uplink synchronous transmission scheme (USTS) where the UEs synchronize frames of uplink physical channels using the single scrambling code, wherein the UEs receive a signal providing system timing provided from the UTRAN and transmit a random access channel (RACH) signal based on the system timing, the apparatus comprising: a controller for determining a transmission time upon receipt of a transmission time adjustment value for slot synchronization from the UTRAN in response to the transmitted RACH signal; a scrambling code generator for creating a scrambling code at the system timing; a frame generator for creating a data frame at the determined transmission time; and a scrambler for scrambling, at the transmission time determined by the controller, the data frame with the scrambling code generated at a time being different from a transmission time of the frame data with a scrambling code offset calculated from the transmission time adjustment value at the system time. 12. The apparatus as claimed in claim 11, wherein the system timing is a starting timing of a common pilot channel (CPICH) signal. 13. The apparatus as claimed in claim 11, wherein the system timing is a starting timing of a primary common control physical channel (P-CCPCH) signal. 14. The apparatus as claimed in claim 11, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(τDPCH,n+T o+2*PD) mod 2560description="In-line Formulae" end="tail" where To is a constant value. 15. The apparatus as claimed in claim 11, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=2560-[(τDPCH,n+T o+2*PD) mod 2560]description="In-line Formulae" end="tail" where To is a constant value. 16. The apparatus as claimed in claim 11, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(τDPCH,n+T o+2*PD) mod 256*mdescription="In-line Formulae" end="tail" where To is a constant value, and m=1,2,3, . . . ,10. 17. The apparatus as claimed in claim 11, wherein the transmission time adjustment value is calculated by: description="In-line Formulae" end="lead" transmission time adjustment value=(256*m)-[(τDPCH,n +To+2*PD) mod 256*m]description="In-line Formulae" end="tail" where To is a constant value, and m=1,2,3, . . . ,10. 18. The apparatus as claimed in claim 11, wherein the transmission time adjustment value from a constant To is calculated by subtracting the propagation delay time from a constant value To. 19. The apparatus as claimed in claim 11, wherein the scrambling code for scrambling the message is delayed by a given scrambling code offset from the scrambling code generated at the system time. 20. The apparatus as claimed in claim 19, wherein the offset is calculated by: description="In-line Formulae" end="lead"offset=τ DPCH,n+To+2PD+Ldescription="In-line Formulae" end="tail" where L indicates the transmission time adjustment value. 21. A method for data transmission in a communication system, the method comprising: receiving, at a Network, a Random Access Channel (RACH) transmitted from a User Equipment (UE); calculating a transmission time adjustment value for the UE; transmitting the transmission time adjustment to the UE; receiving, at the UE, the transmission time adjustment value; calculating a starting timing of an uplink frame; generating an orthogonal code for spreading the uplink frame at the starting timing of the uplink frame; generating a scrambling code for scrambling code for scrambling the uplink frame at a predetermined timing; and transmitting the uplink frame scrambled and spread by the scrambling code and the orthogonal code with reference to the starting timing of the uplink frame. 22. The method as claimed in claim 21, wherein the predetermined timing for the scrambling code is a starting timing of a common pilot channel (CPICH). 23. The method as claimed in claim 21, wherein the starting timing of the uplink frame is synchronized with a starting timing of a slot time of a common pilot channel (CPICH). 24. The method as claimed in claim 23, wherein the transmission time adjustment value can be adjusted as much as a propagation delay of an uplink and downlink.