ENHANCED ACCESS CHANNEL MASKS FOR xHRPD

• US 20120076157A1
• Filed: 09/08/2011
• Published: 03/29/2012
• Est. Priority Date: 09/27/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Sanggook, ROH, Dongwook, Sun, Lihsiang
• Granted Patent: US 8,605,753 B2
• Time in Patent Office: Days
• US Class Current: 370/474
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04J 13/102 Combining codes
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04W 74/002 Transmission of channel access control information

Abstract

Disclosed is a method of performing Pseudo-random-Noise (PN) quadrature covering for transmitting data via an access channel. Such method is achieved by receiving a 42-bit access long code mask MI_ACMAC and a 42-bit access long code mask MQ_ACMAC from an upper layer; generating an MI mask and an MQ mask for PN quadrature covering by using certain bits of an assigned channel number for the access channel and by performing exclusive OR operations on certain bits of the received access long code mask MI_ACMAC and performing exclusive OR operations on certain bits of the received access long code mask MQ_ACMAC; and transmitting signals via the access channel based on the generated 12-bit MI mask and the generated 12-bit MQ mask.

Claims

1. A method of performing Pseudo-Noise (PN) quadrature covering for transmitting data via an access channel, the method comprising:

receiving an access long code mask MI_ACMAC and an access long code mask MQACMAC from an upper layer, said access long code mask MI_ACMAC and said access long code mask MQ_ACMAC being defined in a reverse traffic channel Medium Access Control (MAC) protocol;

generating an MI mask and an MQ mask for PN quadrature covering by using certain bits of an assigned channel number for the access channel and by performing exclusive OR operations on certain bits of the received access long code mask MI_ACMAC and performing exclusive OR operations on certain bits of the received access long code mask MQ_ACMAC,

said MI mask being a masking sequence for an In-phase (I) branch of a Quadrature Phase-Shift Keying (QPSK) modulation for the access channel and said MQ mask being a masking sequence for a Quadrature-phase (Q) branch of the QPSK modulation for the access channel; and

transmitting signals via the access channel based on the generated MI mask and the generated MQ mask.

2. The method of claim 1, wherein the access long code mask MI_ACMAC and the access long code mask MQ_ACMAC are respectively 42 bits in length.

3. The method of claim 2, wherein the generated MI mask and the generated MQ mask are respectively 12 bits in length, and the MI mask having MI11 to MI0, where MI11 indicates the 12th bit of the MI mask and MI0 indicates the 1st bit of the MI mask, and the MQ mask having MQ11 to MQ0, where MQ11 indicates the 12th bit of the MQ mask and MQ0 indicates the 1st bit of the MQ mask.

4. The method of claim 2, wherein the generating step further comprises:

setting MI3 to MI0 of a MI mask and MQ3 to MQ0 of a MQ mask to the lower 4 bits of the assigned channel number, wherein the MI mask and the MQ mask are respectively comprised of 12 bits and used for PN quadrature covering.

5. The method of claim 3, wherein the generating step further comprises:

setting MI11 to MI4 of the MI mask to be equal to the result of (A31 to A24)⊕

(A23 to A16)⊕

(A15 to A8)⊕

(A7 to A0), where A31 to A0 are lower 32 bits of the 42-bit access long code mask MI_ACMAC, and where (A31 to A24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MI_ACMAC.

6. The method of claim 3, wherein the generating step further comprises:

setting MQ11 to MQ4 of the MQ mask to be equal to the result of (B31 to B24)⊕

(B23 to B16)⊕

(B15 to B8)⊕

(B7 to B1, B32), where B31 to B0 are lower 32 bits of the 42-bit access long code mask MQ_ACMAC, where B32 is the 33rd bit of the MQ_ACMAC, where (B31 to B24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MQ_ACMAC, wherein (B7 to B1, B32) comprises an 8-bit sequence having the first 7 bits filled with the 8th bit to the 2nd bit of the MQ_ACMAC and the last bit filled with the 33rd bit of the MQ_ACMAC.

7. An apparatus to perform Pseudo-Noise (PN) quadrature covering for transmitting data via an access channel, the apparatus comprising:

a receiver that receives an access long code mask MI_ACMAC and an access long code mask MQ_ACMAC from an upper layer, said access long code mask MI_ACMAC and said access long code mask MQ_ACMAC being defined in a reverse traffic channel Medium Access Control (MAC) protocol;

a generator that generates an MI mask and an MQ mask for PN quadrature covering by using certain bits of an assigned channel number for the access channel and by performing exclusive OR operations on certain bits of the received access long code mask MI_ACMAC and performing exclusive OR operations on certain bits of the received access long code mask MQ_ACMAC,

said MI mask being a masking sequence for an In-phase (I) branch of a Quadrature Phase-Shift Keying (QPSK) modulation for the access channel and said MQ mask being a masking sequence for a Quadrature-phase (Q) branch of the QPSK modulation for the access channel; and

a transmitter that transmitting signals via the access channel based on the generated MI mask and the generated MQ mask.

8. The apparatus of claim 7, wherein the access long code mask MI_ACMAC and the access long code mask MQ_ACMAC are respectively 42 bits in length.

9. The apparatus of claim 7, wherein the generated MI mask and the generated MQ mask are respectively 12 bits in length, and the MI mask having MI11 to MI0, where MI11 indicates the 12th bit of the MI mask and MI0 indicates the 1st bit of the MI mask, and the MQ mask having MQ11 to MQ0, where MQ11 indicates the 12th bit of the MQ mask and MQ0 indicates the 1st bit of the MQ mask.

10. The apparatus of claim 9, wherein the generator further performs the generating step by:

setting MI3 to MI0 of a MI mask and MQ3 to MQ0 of a MQ mask to the lower 4 bits of the assigned channel number, wherein the MI mask and the MQ mask are respectively comprised of 12 bits and used for PN quadrature covering.

11. The apparatus of claim 9, wherein the generator further performs the generating step by:

setting MI11 to MI4 of the MI mask to be equal to the result of (A31 to A24) 0 (A23 to A16)⊕

(A15 to A8)⊕

(A7 to A0), where A31 to A0 are lower 32 bits of the 42-bit access long code mask MI_ACMAC, and where (A31 to A24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MI_ACMAC.

12. The apparatus of claim 9, wherein the generator further performs the generating step by:

setting MQ11 to MQ4 of the MQ mask to be equal to the result of (B31 to B24)⊕

(B23 to B16)⊕

(B15 to B8)⊕

(B7 to B1, B32), where B31 to B0 are lower 32 bits of the 42-bit access long code mask MQ_ACMAC, where B32 is the 33rd bit of the MQ_ACMAC, where (B31 to B24) is an 8-bit sequence starting from the 32nd bit to the 25th bit of the MQ_ACMAC, wherein (B7 to B1, B32) comprises an 8-bit sequence having the first 7 bits filled with the 8th bit to the 2nd bit of the MQ_ACMAC and the last bit filled with the 33rd bit of the MQ_ACMAC.