Apparatus and method for allocating OVSF codes and I/Q channels for reducing peak-to-average power ratio in transmitting data via enhanced up-link dedicated channels in WCDMA systems

• US 7,903,618 B2
• Filed: 05/11/2009
• Issued: 03/08/2011
• Est. Priority Date: 02/14/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Heo, Youn-Hyoung, Kim, Young-Bum, Kwak, Yong-Jun, Cho, Joon-Young, Lee, Ju-Ho
• Primary Examiner(s): LE, NHAN T
• Application Number:
  US12/463,884
• Publication Number:
  US 20090245209A1
• Time in Patent Office: 666 Days
• Field of Search: 370/328, 370/329, 370/335, 370/342, 370/432, 370/427, 370/438, 370/442, 370/443, 375/140, 375/142, 375145-147, 375/149, 375/340, 375/341, 375/346
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04J 13/0044 OVSF [orthogonal variable spreading factor]
• CPC Class Codes: H04J 13/20 having an orthogonal variable spreading factor [OVSF]

Abstract

An apparatus and method in which an Enhanced Uplink Dedicated transport CHannel (EUDCH) is used in a Wideband Code Division Multiple Access (WCDMA) system is provided. In a User Equipment (UE), when physical channels for transmitting EUDCH data are transmitted in addition to existing physical channels, a Peak-to-Average Power Ratio (PAPR) of an uplink transport signal increases. The increase in PAPR depends upon Orthogonal Variable Spreading Factor (OVSF) codes allocated to the corresponding physical channels and In-phase/Quadrature-phase (I/Q) channels. Therefore, the apparatus and method allocate optimum OVSF codes and I/Q channels to EUDCH-related physical channels in order to minimize an increase in PAPR due to EUDCH.

Claims

1. A method for transmitting enhanced packet data in a mobile communication system, the method comprising the steps of:

generating a dedicated physical control channel (DPCCH) using an Orthogonal Variable Spreading Factor (OVSF) code (256,0) and a quadrature-phase (Q) channel;

generating a dedicated physical data channel (DPDCH) using an OVSF code (SF_DPDCH, SF_DPDCH/4) and an in-phase (I) channel, where SF_DPDCH denotes a spreading factor of the DPDCH;

generating an E-DPCCH using an OVSF code (SF_E-DPCCH,

     1) and the I channel, where SF_E-DPDCH denotes a spreading factor of an OVSF code to be allocated to a dedicated control channel (E-DPCCH) for supporting transmission of enhanced uplink packet data; and

generating an E-DPDCH using an OVSF code (SF_E-DPDCH, SF_E-DPDCH/2) and the Q channel, where SF_E-DPDCH denotes a spreading factor of an OVSF code to be allocated to a dedicated data channel (E-DPDCH) for supporting transmission of the enhanced uplink packet data.

2. The method of claim 1, further comprising the step of, if SF_E-DPDCH is 4 and two E-DPDCHs are simultaneously transmitted, simultaneously generating an E-DPDCH1 and an E-DPDCH2 which are spread with an OVSF code (4, 2) on the I channel and the Q channel, respectively.

3. The method of claim 1, further comprising the step of, if SF_E-DPDCH is 2 and two E-DPDCHs are simultaneously transmitted, generating an E-DPDCH1 and an E-DPDCH2 which are spread with an OVSF code (2, 1) on the I channel and the Q channel, respectively.

4. The method of claim 1, further comprising the step of, if SF_E-DPDCH is 2 and one E-DPDCH is transmitted, generating an E-DPDCH which is spread with an OVSF code (2, 1) on the Q channel.

5. The method of claim 1, wherein further comprising the step of, if an E-DPCCH is transmitted, generating an E-DPCCH which is spread with an OVSF code (256,1) on the I channel.

6. The method of claim 1, further comprising the step of, if a high speed downlink packet access (HSDPA) service is achieved, generating a high speed downlink physical control channel (HS-DPCCH) using an OVSF code (256,64) and the Q channel.

7. The method of claim 1, further comprising the step of, if no DPDCH is transmitted, generating third and fourth E-DPDCHs using an OVSF code (4, 1).

8. The method of claim 7, further comprising the step of using an OVSF code (4,1) and the I channel for the third E-DPDCH and using an OVSF code (4,1) and the Q channel for the fourth E-DPDCH.

9. An apparatus for transmitting enhanced packet data in a mobile communication system, the apparatus comprising:

a controller for allocating an orthogonal variable spreading factor (OVSF) code (256,

     0) and a quadrature-phase (Q) channel to a dedicated physical control channel (DPCCH), allocating an OVSF code (SF_DPDCH, SF_DPDCH/4) and an in-phase (I) channel to a dedicated physical data channel (DPDCH), where SF_DPDCH denotes a spreading factor of the DPDCH, allocating an enhanced dedicated physical control channel (E-DPCCH) to an OVSF code (SF_E-DPCCH,

     1) and the I channel, where SF_E-DPCCH denotes a spreading factor of an OVSF code to be allocated to the E-DPCCH for supporting transmission of enhanced uplink packet data, and allocating an enhanced dedicated physical data channel (E-DPDCH) to an OVSF code (SF_E-DPDCH, SF_E-DPDCH/2) and the Q channel, where SF_E-DPDCH denotes a spreading factor of an OVSF code to be allocated to the E-DPDCH for supporting transmission of the enhanced uplink packet data;

a spreader for spreading the E-DPDCH and the E-DPCCH according to a control signal from the controller;

a summer for summing up the spread E-DPDCH and E-DPCCH; and

a transmitter for transmitting the summed signal.

10. The apparatus of claim 9, wherein if SF_E-DPDCH is 4 and two E-DPDCHs are simultaneously transmitted, the controller allocates a first E-DPDCH and a second E-DPDCH to an OVSF code (4, 2) on the I channel and the Q channel, respectively.

11. The apparatus of claim 9, wherein if SF_E-DPDCH is 2 and two E-DPDCHs are simultaneously transmitted, the controller allocates a first E-DPDCH and a second E-DPDCH to an OVSF code (2, 1) on the I channel and the Q channel, respectively.

12. The apparatus of claim 9, wherein if SF_E-DPDCH is 2 and one E-DPDCH is transmitted, the controller allocates an E-DPDCH to an OVSF code (2, 1) on the Q channel.

13. The apparatus of claim 9, wherein the controller allocates an E-DPCCH to an OVSF code (256, 1) on the I channel.

14. The apparatus of claim 9, wherein if a high speed downlink packet access (HSDPA) service is achieved, the controller allocates a high speed-downlink physical control channel (HS-DPCCH) to an OVSF code (256, 64) on the Q channel.

15. The apparatus of claim 9, wherein the controller allocates third and fourth E-DPDCHs to the Q channel and the I channel with an OVSF code (4, 1), respectively.

16. A method for receiving enhanced packet data in a mobile communication system, the method comprising the steps of:

receiving information indicating a transport channel condition from a user equipment (UE);

transmitting scheduling allocation information indicating data rate information of an enhanced dedicated physical data channel (E-DPDCH) to the UE;

receiving a dedicated physical control channel (DPCCH) using an orthogonal variable spreading factor (OVSF) code (256,

     0) and a quadrature-phase (Q) channel;

receiving a dedicated physical data channel (DPDCH) using an OVSF code (SF_DPDCH, SF_DPDCH/4) and an in-phase (I) channel, where SF_DPDCH denotes a spreading factor of the DPDCH;

receiving an enhanced dedicated physical control channel (E-DPCCH) using an OVSF code (SF_E-DPCCH,

     1) and the I channel, where SF_E-DPCCH denotes a spreading factor of an OVSF code to be allocated to the E-DPCCH for supporting transmission of enhanced uplink packet data; and

receiving an E-DPDCH using an OVSF code (SF_E-DPDCH, SF_E-DPDCH/2) and the Q channel, where SF_E-DPDCH denotes a spreading factor of an OVSF code to be allocated to the E-DPDCH for supporting transmission of the enhanced uplink packet data.

17. The method of claim 16, further comprising the step of, if SF_E-DPDCH is 4 and two E-DPDCHs are simultaneously transmitted, receiving a first E-DPDCH and a second E-DPDCH using an OVSF code (4, 2) on the I channel and the Q channel, respectively.

18. The method of claim 16, further comprising the step of, if SF_E-DPDCH is 2 and two E-DPDCHs are simultaneously transmitted, receiving a first E-DPDCH and a second E-DPDCH using an OVSF code (2, 1) on the I channel and the Q channel, respectively.

19. The method of claim 16, further comprising the step of, if SF_E-DPDCH is 2 and one E-DPDCH is transmitted, receiving the E-DPDCH using an OVSF code (2, 1) on the Q channel.

20. The method of claim 16, further comprising the step of, if an E-DPCCH is transmitted, receiving the E-DPCCH using an OVSF code (256, 1) on the I channel.

21. The method of claim 16, further comprising the step of receiving a high speed-downlink physical control channel (HS-DPCCH) using an OVSF code (256, 64) and the Q channel if a high speed downlink packet access (HSDPA) service is achieved.

22. The method of claim 16, further comprising the step of, if the DPDCH is not transmitted, receiving third and fourth E-DPDCHs using an OVSF code (4, 1).

23. The method of claim 22, wherein the third E-DPDCH is received using an OVSF code (4, 1) and the I channel, and the fourth E-DPDCH is received using an OVSF code (4, 1) and the Q channel.

24. An apparatus for receiving enhanced packet data in a mobile communication system, the apparatus comprising:

a receiver for receiving information indicating a transport channel condition from a user equipment (UE), receiving a dedicated physical control channel (DPCCH) using an orthogonal variable spreading factor (OVSF) code (256,

     0) and a quadrature-phase (Q) channel, receiving a dedicated physical data channel (DPDCH) using an OVSF code (SF_DPDCH, SF_DPDCH/4) and an in-phase (I) channel, where SF_DPDCH denotes a spreading factor of the DPDCH, receiving an enhanced dedicated physical control channel (E-DPCCH) using an OVSF code (SF_E-DPCCH,

     1) and the I channel, where SF_E-DPCCH denotes a spreading factor of an OVSF code to be allocated to the E-DPCCH for supporting transmission of enhanced uplink packet data, and receiving an enhanced dedicated physical data channel (E-DPDCH) using an OVSF code (SF_E-DPDCH, SF_E-DPDCH/2) and the Q channel, where SF_E-DPDCH denotes a spreading factor of an OVSF code to be allocated to the E-DPDCH for supporting transmission of the enhanced uplink packet data;

a transmitter for transmitting scheduling allocation information indicating data rate information of the E-DPDCH to the UE; and

a controller for controlling the receiver and the transmitter.

25. The apparatus of claim 24, wherein if SF_E-DPDCH is 4 and two E-DPDCHs are simultaneously transmitted, the receiver receives a first E-DPDCH and a second E-DPDCH using an OVSF code (4, 2) on the I channel and the Q channel, respectively.

26. The apparatus of claim 24, wherein if SF_E-DPDCH is 2 and two E-DPDCHs are simultaneously transmitted, the receiver receives a first E-DPDCH and a second E-DPDCH using an OVSF code (2, 1) on the I channel and the Q channel, respectively.

27. The apparatus of claim 24, wherein if SF_E-DPDCH is 2 and one E-DPDCH is transmitted, the receiver receives the E-DPDCH using an OVSF code (2, 1) on the Q channel.

28. The apparatus of claim 24, wherein if an E-DPCCH is transmitted, the receiver receives the E-DPCCH using an OVSF code (256, 1) on the I channel.

29. The apparatus of claim 24, wherein the receiver receives a high speed-downlink physical control channel (HS-DPCCH) using an OVSF code (256, 64) and the Q channel if a high speed downlink packet access (HSDPA) service is achieved.

30. The apparatus of claim 24, wherein if the DPDCH is not transmitted, the receiver receives third and fourth E-DPDCHs using an OVSF code (4, 1).

31. The apparatus of claim 30, wherein the receiver receives the third E-DPDCH using an OVSF code (4, 1) and the I channel, and receives the fourth E-DPDCH using an OVSF code (4, 1) and the Q channel.