Method for allocating physical channel of mobile communication system and communication method using the same

• US 6,778,835 B2
• Filed: 03/16/2001
• Issued: 08/17/2004
• Est. Priority Date: 03/18/2000
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: You, Cheol Woo, Seol, Jee Woong, Kang, Young Hwan
• Primary Examiner(s): TRAN, CONGVAN
• Application Number:
  US09/809,267
• Publication Number:
  US 20010024956A1
• Time in Patent Office: 1,250 Days
• Field of Search: 455/450, 455/455, 455/464, 455/343, 455/509-511, 455/515, 455/516, 455/154.1, 455/158.1, 455/185.1, 370/327, 370/328, 370/329, 370/335, 370/341, 370/431, 370/493, 370/437
• US Class Current: 455/455
• CPC Class Codes: H04J 13/0044 OVSF [orthogonal variable spreading factor]
• CPC Class Codes: H04J 13/20 having an orthogonal variable spreading factor [OVSF]
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

The present invention relates to a physical channel allocation method of a mobile communication system and a communication method using the same which is capable of allocating physical channels efficiently for a RACH (Random Access Channel) and a CPCH (Common Packet Channel) having extra up-link scrambling code in a next generation mobile communication system. The communication method of the mobile communication system in accordance with the present invention comprises transmitting a preamble signature code Csig,s generated by using one signature among a plurality of signatures AP#s and a PRACH (Physical Random Access Channel) access preamble code Cpre,n,s generated by using one PRACH preamble scrambling code SC#j among a x-number of PRACH preamble scrambling codes SC#m permitted to the pertinent cell along with an AP (Access Preamble) through a RACH from a terminal to a base station, receiving an AI (Acquisition Indicator) informing a usage of the signature by decoding a signature included in the received AP and the kind of the PRACH scrambling code from the base station by the terminal, and transmitting a message of the terminal to the base station by using a channelizing code determined by the approved signature and PRACH message part scrambling code MSC#m. Accordingly, the terminal and base station can communicate efficiently.

Claims

1. A communication method of a mobile communication system comprising:

a step in which a terminal carries a preamble signature code (Csig,s) generated by using one of a plurality of signatures (AP#s) and a physical channel (PRACH) access preamble code (Cpre,n,s) of a first up-link generated by using one (SC#i) of ‘

x’

number of physical channel (PRACH) preamble scrambling codes (SC#m) of the first up-link allowed to a corresponding cell, on an access preamble (AP), and transmits them to a base station through a channel (RACH) of the first up-link;

a step in which the terminal receives an AI from the base station which decodes the signature included in the received AP and the type of the physical channel (PRACH) scrambling code of the first up-link and generates an AI informing whether the signature is available for use, through a channel (AICH#m) of a first down-link; and

a step in which the terminal transmits its message to the base station by using a channelization code that is determined by an acquired signature and the physical channel (PRACH) message part scrambling code (MSC#m) of the first up-link.

2. The communication method of the mobile communication system according to claim 1, wherein the channel of the first up link is a RACH#m, the physical channel of the first up link is a PRAC#mH, and the first down link channel is an AICH#m and/or a RRICH#m.

32. The communication method of the mobile communication system according to claim 1, wherein the first up link is a CPCH, the first up link physical channel is a PCPCH, the first down link is an AP-AICH#m, and the second down link is a CD-AICH#m.

3. A communication method of a mobile communication system comprising:

a step in which a terminal carries a preamble signature code (Csig,s) generated by using one of a plurality of signatures (AP#s) and a PRACH access preamble code (Cpre,n,s) generated by using one (SC#i) of ‘

x’

number of PRACH preamble scrambling codes (SC#m) allowed to a corresponding cell, on an access preamble (AP), and transmits them to a base station through RACH;

a step in which the terminal receives an AI from the base station which decodes the signature included in the received AP and the type of the PRACH scrambling code and generates the AI informing whether the signature is available for use through a AICH#m; and

a step in which the terminal transmits its message to the base station by using a channelization code that is determined by an acquired signature and the PRACH message part scrambling code (MSC#m).

4. The communication method of the mobile communication system according to claim 3, wherein the number of signatures is 16.

5. The communication method of the mobile communication system according to claim 3, wherein the x-number can be optionally determined.

6. The communication method of the mobile communication system according to claim 3, wherein the x-number is a reuse factor of the pertinent cell, it is not smaller than 2 and not greater than 16.

7. The communication method of the mobile communication system according to claim 3, wherein the plurality of signatures AP#s and the “

x”

number of PRACH preamble scrambling codes SC#m are determined by an ASC (Access Service Class) given to the superior layer of a protocol of the terminal and base station.

8. The communication method of the mobile communication system according to claim 7, wherein the superior layer has information about usable signatures, a RACH code channel group, and a RACH sub-channel group about each RACH code channel in the RACH code channel group defined in accordance with the each ASO.

9. The communication method of the mobile communication system according to claim 8, wherein the RACH code channel group is constructed with a certain number of RACH code channels among the x-number of RACH code channels.

10. The communication method of the mobile communication system according to claim 8, wherein the RACH sub-channel group is a set constructed with a certain number of RACH sub-channels among the 12 RACH sub-channels.

11. The communication method of the mobile communication system according to claim 3, wherein the RACH defines the sub-channels of itself and slots corresponding to the sub-channels respectively, and the definitions can be same or different in accordance with the RACH code channel.

12. The communication method of the mobile communication system according to claim 3, wherein the RACH code channels correspond one-to-one to the PRACH preamble scrambling code.

13. The communication method of the mobile communication system according to claim 3, wherein the AICH#m uses the same down link scrambling code and different OVSF code.

14. The communication method of the mobile communication system according to claim 3, wherein the PRACH message part scrambling code MSC#m is in one-to-one correspondence relation with the PRACH preamble scrambling code.

15. The communication method of the mobile communication system according to claim 3, wherein the AICH#m structure comprises access slots repeated by a x-number unit.

16. The communication method of the mobile communication system according to claim 15, wherein the one access slot is constructed with an AI part and a non-transmission part.

17. The communication method of the mobile communication system according to claim 16, wherein bits a_j^m included in the AI part is determined by $a_j^m=\sum _{}^{}$

s=0x

 



AIsm

 



bs,j,

herein, AI_s^m is an AI (Acquisition Indicator) about the signature AP#s transmitted along with the AP by the terminal, it has a value among {+1, −

1, 0}, and b_sj is a number describing the signature pattern.

18. The communication method of the mobile communication system according to claim 3, wherein the AICH#m further comprises a RRICH#m (Reuse RACH Indicator Channel) considering the reuse factor of the RACH.

19. The communication method of the mobile communication system according to claim 18, wherein the RRICH#m uses transmission interruption time in the one access slot on the AICH#m used for the RACH#m.

20. The communication method of the mobile communication system according to claim 18, wherein the information transmission unit of the RRICH#m is same with the information transmission unit of the AICH#m.

21. The communication method of the mobile communication system according to claim 18, wherein the approval of the signature is judged by the AICH#m, and the approval of the PRACH#m preamble scrambling code is judged by the RRICH#m.

22. The communication method of the mobile communication system according to claim 18, wherein the RRICH#m and AICH#m can determine optionally the down link scrambling code and channel section code of themselves.

23. The communication method of the mobile communication system according to claim 18, wherein the RRICH#m can be transmitted from the base station to the terminal by one frame unit or each access slot unit.

24. The communication method of the mobile communication system according to claim 18, wherein the RRICH#m structure comprises access slots repeated by a x-number unit.

25. The communication method of the mobile communication system according to claim 24, wherein the one access slot is constructed with a non-transmission bit part and a RI (Reuse Indicator) part describing a reuse.

26. The communication method of the mobile communication system according to claim 24, wherein bits included in the RI part can be mapped variously when the RRICH#m is used for informing the approval of the PRACH preamble scrambling code.

27. The communication method of the mobile communication system according to claim 24, wherein bits b^ki of the RI part are determined by $b_k^i=\sum _{}^{}$

m=0x

 



RIm

 



ck,

herein, RI_m describes the approval about the PRACH preamble scrambling code SC#m and it has a value among {+1, −

1, 0}.

28. The communication method of the mobile communication system according to claim 18, wherein the AICH#m structure considering the reuse factor is constructed with an AI part informing the approval of the used signature, a RI part informing the approval of the used PRACH preamble scrambling code, and a non-transmission part.

29. The communication method of the mobile communication system according to claim 28, wherein bits a_j included in the AI part are determined by $a_j=\sum _{}^{}$

s=015

 



AIs

 



cs,j,

herein, the AIs describes the AI about the used signature AP#s, it has a value among +1, −

1, 0, and c_s,j describes a coefficient.

30. The communication method of the mobile communication system according to claim 28, wherein bits b_j included in the RI part are determined by $b_j=\sum _{}^{}$

m=015

 



RIm

 



cm,j,

herein, the RI_m describes the approval about the used PRACH preamble scrambling code SC#m, it has a value among {+1, −

1, 0}, and the C_m,j describes a coefficient.

31. The communication method of the mobile communication system according to claim 18, wherein the RRICH#m can be transmitted from the base station to the terminal by one frame unit or each access slot unit.

33. A communication method of a mobile communication system comprising:

a step in which a terminal carries a preamble signature code (Csig,s) generated by using one of a plurality of signatures (AP#s) and a PCPCH access preamble code (Cpre,n,s) generated by using one (APSC#i) of ‘

x’

number of PCPCH preamble scrambling codes (APSC#m) allowed to a corresponding cell, on an access preamble (AP), and transmits them to a base station through a CPCH;

a step in which the terminal receives the AI from the base station which decodes the signature included in the received AP and the type of the PCPCH scrambling code and generates the AI informing whether the signature is available for use, through an AP-AICH#m;

a step in which the terminal transmits its message to the base station by using a channelization code that is determined by the acquired signature and the physical channel (PRACH) message part scrambling code (MSC#m);

a step in which the terminal carries a preamble signature code (Ca-acc,s) generated by using one of a plurality of signatures (AP#s) and a PCPCH-CD access preamble code (Cc-cd,n,s) generated by using one (CDSC#i) of ‘

y’

number PCPCH-CD preamble scrambling codes (CDSC#m) allowed to a corresponding cell, on an collision detecting preamble (CD), and transmits them to a base station through the CPCH;

a step in which the terminal receives an AI from a base station which generates the AI informing on the collision for the CD for detecting a collision through CD-AICH#m; and

a step in which the terminal transmits its message to the base station by using the channelization code determined by the acquired signature and the PRACH message part scrambling code (MSC#m).

34. The communication method of the mobile communication system according to claim 33, wherein the PCPCH access preamble scrambling code is in an one-to-one correspondence relation with the AP-AICH#m, and the PCPCH CD access preamble scrambling code is in an one-to-one correspondence relation with the CD-AICH#m.

35. The communication method of the mobile communication system according to claim 33, wherein the AP-AICH#m and CD-AICH#m use the same down link scrambling code.

36. The communication method of the mobile communication system according to claim 33, wherein the AP-AICH#m uses the different channelizing code each other, and CD-AICH#m uses the different channelizing code each other.

37. The communication method of the mobile communication system according to claim 36, wherein a certain channelizing code of the AP-AICH#m and a certain channelizing code of the CD-AICH#m can be same.

38. The communication method of the mobile communication system according to claim 36, wherein when the x is 64, the number of CPCH code channels is 4, the each CPCH code channel has the 16 PCPCH scrambling codes.

39. The communication method of the mobile communication system according to claim 33, wherein the AP-AICH#m or CD-AICH#m structure comprises access slots repeated by a x-number unit.

40. The communication method of the mobile communication system according to claim 39, wherein the access slot is constructed with an AI part and a non-transmission part.

41. The communication method of the mobile communication system according to claim 33, wherein the AP-AICH#m further comprises an AP-CRICH#m, and the CD-AICH#m further comprises a CD-CRICH#m.

42. The communication method of the mobile communication system according to claim 41, wherein the AP-CRICH#m and/or CD-CRICH#m uses transmission interruption time in the one access slot of the AP-AICH#m and/or CD-AICH#m used for the CPCH#m.

43. The communication method of the mobile communication system according to claim 42, wherein the AP-CRICH#m and CD-CRICH#m structure comprise access slots repeated by a x-number unit.

44. The communication method of the mobile communication system according to claim 42, wherein the one access slot is constructed with a non-transmission part and a RI (Reuse Indicator) part describing a reuse.

45. The communication method of the mobile communication system according to claim 42, wherein bits included in the RI part can be mapped variously when the AP-CRICH#m and CD-CRICH#m are used for informing the approval of the PCPCH preamble scrambling code and PCPCH CD preamble scrambling code.

46. The communication method of the mobile communication system according to claim 41, wherein the structures of the AP-CRICH#m and CD-CRICH#m considering the reuse factor are constructed with an AI part informing the approval of the used signature, a RI part informing the approval of the used PRACH preamble scrambling code, and a non-transmission part.

47. A physical channel allocation method of a mobile communication system, wherein a terminal transmits an access preamble by using a signature among 16 signatures and a PRACH preamble scrambling code among PRACH preamble scrambling codes allotted to the pertinent cell in order to be allocated a PRACH when a plurality of PRACH preamble codes are allotted to the pertinent cell in consideration of a reuse of the PRACH and wherein the terminal transmits a message using a PRACH message part scrambling code having a one-to-one correspondence with a PRACH preamble scrambling code used as an access preamble when the transmitted access preamble is approved by a base station.

48. The physical channel allocation method of the mobile communication system according to claim 47, wherein the PRACH preamble scrambling code used as the access preamble and the PRACH message part scrambling code use the different parts of the same code.

49. A physical channel allocation method of a mobile communication system, comprising:

transmitting an AP (Access Preamble) by using a signature among 16 signatures AP#s (s=0, . . . ,

     15) and a PRACH preamble scrambling code SC#m among PRACH preamble scrambling codes allotted to the pertinent cell for allocating a PRACH in order to transmit data from a terminal to a base station when reuse of the PRACH is considered; and

transmitting a message by using a PRACH message part scrambling code having one-to-one correspondence with the PRACH preamble scrambling code SC#m used in the AP (Access Preamble) when the AP is approved by the base station, wherein the base station amends the conventional AICH structure and informs through the amended AICH whether the access preamble transmitted from the terminal is approved.

50. The physical channel allocation method of the mobile communication system according to claim 49, wherein the signature and PRACH preamble scrambling code usable in the access preamble for the RACH transmission by the terminal are determined by an ASC (Access Service Class) given by the superior layer for the RACH transmission.

51. The physical channel allocation method of the mobile communication system according to claim 49, wherein information about the approval of the access preamble transmitted from the terminal and the present RACH are informed through the conventional AICH or a certain physical channel RRICH.

52. The physical channel allocation method of the mobile communication system according to claim 49, wherein when the number meaning the reuse factor of the pertinent cell is not smaller than 2, the information about the reuse of the signature is informed together when the approval about the access preamble transmitted from the terminal is determined and is informed.

53. The physical channel allocation method of the mobile communication system according to claim 52, wherein the approval about the access preamble is informed through the AICH constructed with an AI part informing the approval of the used signature AP#s, and a RI part informing the approval of the used PRACH preamble scrambling code SC#m.

54. A physical channel allocation method of a mobile communication system, wherein an x-number of PCPCH scrambling codes are classified with a y-number of CPCH code channels when 16 signatures AP#s (s=0, . . . , 15) and an x-number of PCPCH scrambling codes per one cell are allotted in the mobile communication system by considering a reuse of PCPCH, the PCPCH scrambling code included in each CPCH code channel is used for the PCPCH message part scrambling code, and two among the PCPCH scrambling codes are selected in order to use them for the PCPCH access preamble scrambling code and PCPCH CD access preamble scrambling code and wherein the terminal transmits a message using a PCPCH message part scrambling code MSC#n when the transmitted AP and CD are approved by the base station, and the MSC#n is determined by the APSC#m and AP#s used in the AP.

55. The physical channel allocation method of the mobile communication system according to claim 54, wherein the terminal transmits the access preamble by using one signature among the 16 signatures and one PCPCH access preamble scrambling code among the PCPCH access preamble scrambling codes allotted to the pertinent cell in order to be allotted the PCPCH when the 16 signatures and x-number of PCPCH scrambling codes per one cell are allocated in consideration of the reuse of the PCPCH.

56. The physical channel allocation method of the mobile communication system according to claim 54, wherein the terminal transmits the access preamble by using one signature among the 16 signatures and one PCPCH CD access preamble scrambling code among the PCPCH CD access preamble scrambling codes allotted to the pertinent cell in order to be allocated the PCPCH when the 16 signatures and x-number of PCPCH scrambling codes per one cell are allotted in consideration of the reuse of the PCPCH.

57. A physical channel allocation method of a mobile communication system, wherein a base station informs through four AP-AICH and four CD-AICH whether an AP and a CD transmitted from a terminal are approved when four CPCH code channels (code-channel#0˜

code-channel#3 exist, and wherein the approval about an AP using an APSC#m is determined by an AP-AICH#m, and the approval about a CD using a CD-APS#m is determined by a CD-AICH#m.

58. A physical channel allocation method of a mobile communication system, wherein an x-number of PCPCH scrambling codes are classified with a y-number of code groups when 16 signatures AP#s (s=0, . . . , 15) and an x-number of PCPCH scrambling codes per one cell are allotted in the mobile communication system by considering a reuse of PCPCH, the PCPCH scrambling code included in each CPCH code channel is used for the PCPCH message part scrambling code, and two among the PCPCH scrambling codes are selected in order to use them as the PCPCH access preamble scrambling code and PCPCH CD access preamble scrambling code and wherein the terminal transmits an access preamble by using one signature among the 16 signatures and one PCPCH access preamble scrambling code among the PRACH access preamble scrambling codes allotted to the pertinent cell in order to be allocated the PCPCH.

59. The physical channel allocation method of the mobile communication system according to claim 58, wherein the terminal transmits a collision detection CD by using one signature among the 16 signatures and one PCPCH access preamble scrambling code among the PRACH access preamble scrambling codes allotted to the pertinent cell in order to be allocated the PCPCH when the reuse of the PCPCH is considered.

60. A communication method in a mobile communication system in which a plurality of terminals transmit an access preamble to a base station, comprising:

transmitting an access preamble from each of the plurality of terminals to the base station using one of a plurality of signatures and one of a plurality of preamble scrambling codes for each access preamble;

receiving an access preamble including the signature and the preamble scrambling code from each of the plurality of terminals at the base station;

transmitting an acquisition indication from the base station to each of the plurality of terminals through one of a plurality of Acquisition Indicator Channels, wherein the acquisition indication indicates whether the signature and preamble scrambling code are usable and each Acquisition Indicator Channel uses different Orthogonal Variable Spreading Factor codes as a channelization code; and

receiving a message at each of the plurality of terminals, the message received at each terminal generated by a channelization code that is determined by the acquired signature and message part scrambling code corresponding to the preamble scrambling code received by the base station from the terminal, wherein the preamble scrambling code, Acquisition Indicator Channel, Orthogonal Variable Spreading Factor Code and message part scrambling codes are uniquely assigned to each of the plurality of terminals and are in a 1;

1;

1;

1 ratio.

61. The method of claim 60, wherein the preamble scrambling code is a code for a physical random access channel or a physical common packet channel.

62. The method of claim 60, wherein the Acquisition Indicator Channel is an access preamble Acquisition Indicator Channel or a collision detection Acquisition Indicator Channel.

63. The method of claim 60, wherein the Acquisition Indicator Channel uses the same down link scrambling code.

64. The method of claim 60, wherein the number of the Acquisition Indicator Channel is determined by the number of the preamble scrambling code allocated to the corresponding cell.

65. The method of claim 60, wherein the Acquisition Indicator Channel includes a first part for acquisition of the signature and a second part for acquisition of the preamble scrambling code.

66. The method of claim 65, wherein the second part is a non-transmission part of the Acquisition Indicator Channel.

67. A communication method in a mobile communication system that is allocated 16 signatures and a plurality of preamble scrambling codes per cell for channel transmission, comprising:

transmitting an access preamble by selecting one of 16 signatures and one of the preamble scrambling codes to the base station;

receiving an acquisition indication from the base station through a separate physical channel and an acquisition indicator channel, wherein the separate physical channel indicates whether the preamble scrambling code is acquired by the base station and the acquisition indicator channel indicates whether the signature is acquired by the base station and

transmitting a message to the base station by using a channelization code that is determined by the acquired signature and message part scrambling code that corresponds to the acquired preamble scrambling code.

68. The method of claim 67, wherein the separate physical channel uses a non-transmission part of the Acquisition Indicator Channel.

69. The method of claim 67, wherein the Acquisition Indicator Channel indicates only whether the signature is acquired by the base station.

70. The method of claim 67, wherein the separate physical channel contains a message that indicates a specific preamble scrambling code.

71. The method of claim 67, wherein an information transmission unit of the separate physical channel is the same as the information unit of the Acquisition Indicator Channel.

72. The method of claim 67, wherein the separate physical channel is a Reuse Random Access Channel Indicator channel on a Common Packet Channel Reuse Indicator channel.