Apparatus and method for generating scrambling code in mobile communication system

• US 20020181708A1
• Filed: 05/28/2002
• Published: 12/05/2002
• Est. Priority Date: 05/29/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Dong Jo, Seo, Kyung Sam
• Granted Patent: US 7,346,165 B2
• Time in Patent Office: Days
• US Class Current: 380/252
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 9/0662 with particular pseudorandom sequence generator

Abstract

A method for generating scrambling codes in a mobile communications system generates an extended code performing a masking operation. A movable selector performs the mask operation to extract continued bits from the extended code under control of a controller. A masked code is selected by the selector, and the selected code and another masked code are subjected to an EXOR operation to generate a scrambling code. A scrambling code generating apparatus includes a register memory for receiving a state value of a scrambling code from upper layer for setting a initial value, an extended code generator for generating a extended state value by a mask operation over the initial value and a input information, and a scrambling code generator for extracting a predetermined number of serial bits from the extended state value, generating at least more than one of state values corresponding to the extracted serial bits, selecting one of state values corresponding to the extracted serial bits, and generating a scrambling code with a selected state value and one of initial values which has not been used. Through this apparatus and method, memory capacity requirements can be significantly reduced, and forward codes which include, for example a primary code, a secondary code, and a delayed value Right and Left alternative, can be generated simultaneously by single code generator.

Claims

1. A scrambling code generating apparatus in a mobile communication system, comprising:

a resister memory which receives a state value of a scrambling code from an upper layer to set initial values thereof;

a generator which generates an extended state value by performing a mask operation based on initial values and input information; and

a scrambling code generator which generates a scrambling code based on at least a first state value which is continuously selected from among the extended state value, a second state value generated based on at least state values (L,R) which correspond to the first state value, and an initial value which has not been used from the initial values.

2. An apparatus according to claim 1, further comprising applying a plurality of masks to extend the state value.

3. An apparatus according to claim 1, further comprising a movable selector which continuously selects a state value under control of a controller.

4. An apparatus according to claim 3, further comprising:

a second selector which selects at least a state value from the continuously selected state values and a delay value which corresponds to the value selected by the controller.

5. An apparatus according to claim 4, wherein the state value selected by the second selector and masked over initial values of a Y sequence register performs an EXOR operation to generate I and Q values.

6. A method of generating a scrambling code in a mobile communication system, comprising:

receiving a state value of scrambling code from an upper layer and setting initial values of at least two registers among a plurality of registers;

generating an extended state value by a mask operation based on one of the initial values and input information;

generating a selected state value with a predetermined number of bits based on the extended state value and a delayed state value thereof; and

selecting at least one of the selected state value and the delayed state value.

12. A method according to claim 6, wherein if the extended value is continuously selected, a primary code is selected based on a Least Significant Bit (LSB) as a reference.

13. A method according to claim 6, wherein if the extended value is continuously selected, a secondary code is selected based on other addresses of the Least Significant Bit (LSB).

14. A method according to claim 6, wherein an N value of a primary or secondary code is generated corresponding to the continuously inputted values on condition that the extended state value is masked on the continuously selected value from the extended state value.

7. A method of generating a scrambling code in a mobile communication system, comprising:

(a) receiving a state value of scrambling code from an upper layer and setting initial values of at least two registers among a plurality of registers;

(b) generating an extended state value by a mask operation based on one of the initial values and input information;

(c) generating a masked state value by the mask operation based on another one of the initial values;

(d) generating a selected state value with a predetermined number of continued bits from the extended state value and a delayed state value thereof;

(e) selecting one or more of the selected state value and the delayed state value; and

(f) outputting at least one of the state values generated in the step (c) or step (e) through a gate.

8. A method according to claim 7, wherein step (b) includes generating a separate X value by inputting a masked value over an initial value of an X-sequence register, and generating an extended state value based on the initial value of the X-sequence register.

9. A method according to claim 7, wherein step (b) includes generating an extended value of an X-sequence register based on the input information and output information outputted by the mask operation, to generate the extended state value which is selected based on the input information which has a plurality of bits through the mask operation.

10. A method according to claim 9, wherein the information outputted from the mask operation is inputted into a second mask operation to generate the extended X value.

11. A method according to claim 10, wherein the information forwarded from the first mask operation to a second mask operation is increased by 1 bit.

15. A method according to claim 13, wherein at least a value, having a delay for the N value corresponding to the continuously inputted values, is generated on condition that the extended state value is masked on the continuously selected value from the extended state value.

16. A method according to claim 14, wherein the scrambling code is generated by inputting to a gate scrambled I/Q values selected among N, L, R and I/Q values masked by a Y value.

17. A method according to claim 16, wherein scrambling codes, outputted by masking when 18-bits are continuously inputted based on 0 of the LSB, has an amount of delay of 0 (Normal), 8192 (Left alternative) and 16384 (Right alternative), and is generated by performing an EXOR operation.

18. A method for generating scrambling codes in a mobile communications system, comprising:

obtaining a user signal;

simultaneously generating a primary code, a secondary code, and a delayed code; and

modulating the user signal with the simultaneously generated primary code, secondary code, and delayed code.

19. A system for generating scrambling codes in a mobile communications system, comprising:

a processor which simultaneously generates a primary code, a secondary code, and a delayed code; and

a modulator which modulates the user signal with the simultaneously generated primary code, secondary code, and delayed code.