AU2007201387B2 - Generation of user equipment identification specific scrambling code for the high speed shared control channel - Google Patents
Generation of user equipment identification specific scrambling code for the high speed shared control channel Download PDFInfo
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- AU2007201387B2 AU2007201387B2 AU2007201387A AU2007201387A AU2007201387B2 AU 2007201387 B2 AU2007201387 B2 AU 2007201387B2 AU 2007201387 A AU2007201387 A AU 2007201387A AU 2007201387 A AU2007201387 A AU 2007201387A AU 2007201387 B2 AU2007201387 B2 AU 2007201387B2
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- cdma
- scrambling sequence
- specific scrambling
- bit
- scch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/23—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using convolutional codes, e.g. unit memory codes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/63—Joint error correction and other techniques
- H03M13/635—Error control coding in combination with rate matching
- H03M13/6362—Error control coding in combination with rate matching by puncturing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/65—Purpose and implementation aspects
- H03M13/6522—Intended application, e.g. transmission or communication standard
- H03M13/653—3GPP HSDPA, e.g. HS-SCCH or DS-DSCH related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Error Detection And Correction (AREA)
Description
Pool Section 29 Regulation 3.2(2) AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Application Number: Lodged: Invention Title: Generation of user equipment identification specific scrambling code for the high speed shared control channel The following statement is a full description of this invention, including the best method of performing it known to us: 1 GENERATION OF USER EQUIPMENT IDENTIFICATION SPECIFIC SCRAMBLING CODE FOR THE HIGH SPEED SHARED CONTROL CHANNEL BACKGROUND The present invention relates to wireless communication systems. More 5 particularly, the present invention relates to user equipment identification specific scrambling sequences for high speed shared control channels (HS-SCCH). A high speed downlink packet access (HSDPA) is proposed for wideband code division multiple access communication systems. HSDPA allows for high downlink data rates to support multimedia services. 10 To support HSDPA, high speed shared control channels (HS-SCCHs) are used. The HS-SCCHs are used to signal vital control information to the user equipments (UEs). Each HS-SCCH has two parts, referred to as Part-1 and Part 2. Part-1 carries time critical information needed by the UE. This information includes the channelization code set and the modulation type used by the high 15 speed physical downlink shared control channel (HS-PDSCH) which carries the HSDPA payload. This information is vital to support HSDPA, since HSDPA uses adaptive modulation and coding (AMC). To obtain its Part-1 information, each HSDPA UE monitors up to four HS SCCHs for its information. The information for a particular UE is distinguished 20 from other UEs by its UE identification (UE ID) specific scrambling sequence. The UE processes each monitored HS-SCCH with its UE ID specific scrambling sequence to detect the HS-SCCH intended for the UE. After processing, the UE determines on which HS-SCCH, if any, information was carried using its scrambling sequence. The UE descrambles the data carried on Part-1 of its HS 25 SCCH using its scrambling sequence. Until recently, a 10 bit UE ID was used as the basis for the UE ID specific scrambling sequence. In this case, this UE ID was converted into a 40 bit scrambling sequence. To turn the 10 bit UE ID into the 40 bit UE ID specific scrambling sequence, the 10 bit UE ID is processed by a Reed-Muller block to 30 produce a 32 bit code. The first 8 bits of the produced code are repeated and appended onto the back of the 32 bit code to produce a 40 bit code. Although it is proposed to extend the UE ID length to 16 chips, the current proposal for the HS-SCCHs uses a 10 bit UE ID. This UE ID is converted into a 2 40 bit scrambling sequence. To turn the 10 bit UE ID into the 40 bit scrambling sequence, the 10 bit UE ID is processed by a Reed-Muller block to produce a 32 bit code. The first 8 bits of the produced code are repeated and appended onto the back of the 32 bit code to produce a 40 bit code. 5 To reduce the occurrence of false detections, it is desirable to have good separation between the produced scrambling codes for each UE ID. Accordingly, it is desirable to have alternate approaches to producing scrambling codes. SUMMARY OF THE INVENTION A code is produced for use in scrambling or descrambling data associated 10 with a high speed shared control channel (HS-SSCH) for a particular user equipment. A user identification of the particular user equipment includes L bits. A rate convolutional encoder processes at least the bits of the user identification by a rate convolutional code to produce the code. According to a first aspect the present invention provides a wideband code 15 division multiple access, W-CDMA, user equipment, UE, including means for monitoring a high-speed-shared control channel, HS-SCCH, for a UE identification, ID, specific scrambling sequence of the W-CDMA UE; means for detecting whether control information carried using the UE ID specific scrambling sequence is present on the HS-SCCH, wherein the control information includes 20 channelization code set and modulation type information used by a high speed physical downlink shared control channel, HS-PDSCH, the W-CDMA UE being characterized by encoding means adapted to produce the UE ID specific scrambling sequence from a result of 1/2 rate convolutional encoding at least an L bit UE ID; wherein the %/ rate convolutional encoding is utilized for forward error 25 correction in the W-CDMA communication system of which the UE is part, in addition to its use for the UE ID specific scrambling sequence. According to a further aspect the present invention provides a method for use in a wideband code division multiple access, W-CDMA, user equipment, UE, the method including monitoring a high-speed-shared control channel, HS-SCCH, 30 for a UE identification, ID, specific scrambling sequence of the W-CDMA UE; and detecting whether control information carried using the UE, ID, specific scrambling sequence is present on the HS-SCCH, wherein the control information includes channelization code set and modulation type information used by a high 3 speed physical downlink shared control channel, HS-PDSCH; the method wherein: the UE ID specific scrambling sequence is produced from a result of /2 rate convolutional encoding at least an L-bit UE ID, the 1/2 rate convolutional encoding 5 being utilized for forward error correction in the W-CDMA communication system, of which the UE is part, in addition to its use for the UE ID specific scrambling sequence. According to a further aspect the present invention provides a wideband code division multiple access, W-CDMA, base station including means for 10 transmitting a high-speed-shared control channel, HS-SCCH, including a UE identification, ID, specific scrambling sequence for a W-CDMA UE, control information carried using the UE ID specific scrambling sequence, the control information including channelization code set and modulation type information used by a high speed physical downlink shared control channel, HS-PDSCH, the 15 W-CDMA base station being characterized by encoding means adapted to produce the UE ID specific scrambling sequence from a result of /2 rate convolutional encoding at least an L-bit UE ID; the 1/2 rate convolutional encoding being utilized for forward error correction in addition to its use for the UE ID specific scrambling sequence. 20 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1A is a preferred diagram of a circuit for producing a code associated with a particular user for a HS-SCCH. Figure 11B is a diagram of a rate matching block used in conjunction with Figure 1A. 25 Figure 2A is a preferred diagram of a circuit for producing a code associated with a user identification of 16 bits. Figure 2B is a diagram of a rate matching block used in conjunction with Figure 2A. Figure 3 is a simplified user equipment using the UE ID specific scrambling 30 code. Figure 4 is a simplified base station using the UE ID specific scrambling code.
3a DESCRIPTION OF PREFERRED EMBODIMENT Although the preferred embodiments are described in conjunction with the preferred application of the invention for use with the HSDPA of the third generation partnership project (3GPP) wideband code division multiple access 5 (W-CDMA) communication system, the invention can be applied to other code 4 division multiple access communication systems. Figures 1A and 1B are diagrams of a preferred UE ID specific scrambling sequence circuit. A UE ID, XUE, of length L is input into the circuit. L can be any length, such as 8 bits, 10 bits, 16 bits, etc. The UE ID, XUE = {XUE1, ... , XUEL}, is input into a 1/2 rate 5 convolutional encoder 10 as shown in Figure 1A. Along with the UE ID, extra bits, such as zeros, may be added to the end of the input string to extend the length of the input string and, accordingly, the output string. The use of a %/ rate convolutional encoder 10 provides for a high level of code separation between the output strings produced by different UE IDs. Additionally, current proposed 3GPP 10 W-CDMA communication systems utilize a 1/2 rate convolutional encoder 10 for a forward error correction (FEC) technique. Accordingly, no additional hardware is required to generate the convolutionally encoded UE ID specific scrambling sequence. After encoding, based on the length of the output string, a rate matching stage 12 may be added to puncture bits to obtain a desired string 15 length. Figures 2A and 2B are diagrams of preferred UE ID specific scrambling sequence circuit for a preferred UE ID codes of length 16, L=16. The 16 bit UE ID, XUE = {XUE1, ---, XUE16), is input into a 1/2 rate convolutional encoder 14 along with eight zero bits appended onto the end of the input string. As a result, the 20 input string is XUE1, ... ; XUE16; 0, 0, 0, 0, 0, 0, 0, 0. After being processed by the 1/2 rate convolutional encoder 14, the output code is 48 bits in length, CUE = {CUE1, CUE48). To reduce the length of the code to a preferred length of 40 bits, eight bits are preferably punctured. Figure 2B illustrates the rate matching stage 16 to 25 perform the puncturing. After the rate matching stage 16, the effective length of the scrambling code is 40 bits. Figure 4 is a simplified diagram of a user equipment descrambling a HS SCCH using the UE ID specific scrambling code. The UE ID scrambling code is mixed, such as by exclusive-or gate 18, with the received HS-SCCH for use in 30 recovering the encoded HS-SCCH data. Figure 3 is a simplified diagram of a base station scrambling encoded data with the UE ID specific scrambling code for transfer over the HS-SCCH. The encoded data is mixed with the UE ID scrambling code, such as by an exclusive- 5 or gate 20, for a particular user. The scrambled data is used to produce the HS SCCH for transfer to the particular user.
Claims (36)
1. A wideband code division multiple access, W-CDMA, user equipment, UE, including means for monitoring a high-speed-shared control channel, HS-SCCH, for a UE identification, ID, specific scrambling sequence of the W-CDMA UE; 5 means for detecting whether control information carried using the UE ID specific scrambling sequence is present on the HS-SCCH, wherein the control information includes channelization code set and modulation type information used by a high speed physical downlink shared control channel, HS-PDSCH, the W-CDMA UE being characterized by encoding means adapted to produce the UE ID specific 10 scrambling sequence from a result of 1/2 rate convolutional encoding at least an L bit UE ID; wherein the %/ rate convolutional encoding is utilized for forward error correction in the W-CDMA communication system of which the UE is part, in addition to its use for the UE ID specific scrambling sequence.
2. The W-CDMA UE of claim 1, wherein the L-bit UE ID is a sixteen bit UE ID. 15
3. The W-CDMA UE of claim 1 or 2, wherein the 2 rate convolutional encoding encodes that L-bit UE ID followed by eight zero bits.
4. The W-CDMA UE of any preceding claim wherein the UE ID specific scrambling sequence is the result of 1/2 rate convolutional encoding at least the L bit UE ID followed by rate matching to puncture bits of an output of the %A rate 20 convolutional encoding of the at least L-bit UE ID.
5. The W-CDMA UE of claim 4 including a rate matching means for puncturing the bits of the 1/2 rate convolutional encoding output.
6. The W-CDMA UE of claims 4 or 5 wherein the rate matching punctures eight bits. 25 7. The W-CDMA UE of any preceding claim wherein the HS-SCCH is descrambled using the UE ID specific scrambling sequence.
7
8. The W-CDMA UE of any preceding claim wherein the control information carried by the UE ID specific scrambling sequence is in Part-1 of the HS-SCCH and the HS-SCCH has the Part-1 and a Part-2.
9. The W-CDMA UE of claim 8 wherein the Part-1 is a result of a scrambling 5 of the control information with the UE ID specific scrambling sequence.
10. The W-CDMA UE of claim 9 wherein the scrambling is performed by exclusive-or means.
11. The W-CDMA UE of any preceding claim wherein the monitoring means monitors up to four HS-SCCHs. 10
12. A method for use in a wideband code division multiple access, W-CDMA, user equipment, UE, the method including monitoring a high-speed-shared control channel, HS-SCCH, for a UE identification, ID, specific scrambling sequence of the W-CDMA UE; and detecting whether control information carried using the UE, ID, specific scrambling sequence is present on the HS-SCCH, 15 wherein the control information includes channelization code set and modulation type information used by a high speed physical downlink shared control channel, HS-PDSCH; the method wherein: the UE ID specific scrambling sequence is produced from a result of 2 rate convolutional encoding at least an L-bit UE ID, the 1/2 rate convolutional encoding 20 being utilized for forward error correction in the W-CDMA communication system, of which the UE is part, in addition to its use for the UE ID specific scrambling sequence.
13. The method of claim 12 wherein the L-bit UE ID is a sixteen bit UE ID.
14. The method of claims 12-13 wherein the 1 % rate convolutional encoding 25 encodes that L-bit UE ID followed by eight zero bits.
15. The method of claims 12-14 wherein the UE ID specific scrambling sequence is the result of 1/2 rate convolutional encoding at least the L-bit UE ID 8 followed by rate matching to puncture bits of an output of the 1/2 rate convolutional encoding of the at least L-bit UE ID.
16. The method of claim 15 wherein the rate matching punctures eight bits.
17. The method of claims 12-16 wherein the HS-SCCH is descrambled using 5 the UE ID specific scrambling sequence.
18. The method of one of claims 12-17 wherein the control information carried by the UE ID specific scrambling sequence is in Part-1 of the HS-SCCH and the HS-SCCH has the Part-1 and a Part-2.
19. The method of claim 18 wherein the Part-1 is a result of a scrambling of 10 the control information with the UE ID specific scrambling sequence.
20. The method of claim 19 wherein the scrambling is performed by exclusive or means.
21. The method of one of claims 12-20 wherein the monitoring monitors up to four HS-SCCHs. 15
22. A wideband code division multiple access, W-CDMA, base station including means for transmitting a high-speed-shared control channel, HS-SCCH, including a UE identification, ID, specific scrambling sequence for a W-CDMA UE, control information carried using the UE ID specific scrambling sequence, the control information including channelization code set and modulation type 20 information used by a high speed physical downlink shared control channel, HS PDSCH, the W-CDMA base station being characterized by encoding means adapted to produce the UE ID specific scrambling sequence from a result of 1 % rate convolutional encoding at least an L-bit UE ID; the 1 % rate convolutional encoding being utilized for forward error correction in addition to its use for the UE 25 ID specific scrambling sequence. 9
23. The W-CDMA base station of claim 22 wherein the L-bit UE ID is a sixteen bit UE ID.
24. The W-CDMA base station of claims 22-23 wherein the 1/2 rate convolutional encoding encodes that L-bit UE ID followed by eight zero bits. 5
25. The W-CDMA base station of one of claims 22-24 wherein the UE ID specific scrambling sequence is the result of 2 rate convolutional encoding at least the L-bit UE ID followed by rate matching to puncture bits of an output of the %/ rate convolutional encoding of the at least L-bit UE ID.
26. The W-CDMA base station of claim 25 including a rate matching means for 10 puncturing the bits of the %A rate convolutional encoding output.
27. The W-CDMA base station of claims 24 or 25 wherein the rate matching punctures eight bits.
28. The W-CDMA base station of claims 22-27 wherein the HS-SCCH is descrambled using the UE ID specific scrambling sequence. 15
29. The W-CDMA base station of one of claims 22-28 wherein the control information carried by the UE ID specific scrambling sequence is in Part-1 of the HS-SCCH and the HS-SCCH has the Part-1 and a Part-2.
30. The W-CDMA base station of claim 29 wherein the Part-1 is a result of a scrambling of the control information with the UE ID specific scrambling 20 sequence.
31. The W-CDMA base station of claim 30 wherein the scrambling is performed by exclusive-or means.
32. A W-CDMA user equipment (UE) for use with the base station of claim 22 including means for receiving the HS-PDSCH when the HS-SCCH is 10 distinguished by having the UE ID specific scrambling sequence of the W-CDMA UE.
33. The W-CDMA UE of claim 32 wherein the UE ID specific scrambling sequence carries control information. 5
34. The W-CDMA UE of claim 1 and substantially as hereinbefore described with reference to the accompanying figures.
35. The method of claim 12 and substantially as hereinbefore described with reference to the accompanying figures.
36. The W-CDMA base station of claim 22 and substantially as hereinbefore 10 described with reference to the accompanying figures. INTERDIGITAL TECHNOLOGY WATERMARK PATENT & TRADE MARK ATTORNEYS P24811AU01
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2007201387A AU2007201387B2 (en) | 2002-05-07 | 2007-03-29 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
| AU2010200335A AU2010200335B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60/378,509 | 2002-05-07 | ||
| US60/378,170 | 2002-05-13 | ||
| US10/187,640 | 2002-07-01 | ||
| AU2003234512A AU2003234512A1 (en) | 2002-05-07 | 2003-05-05 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
| AU2007201387A AU2007201387B2 (en) | 2002-05-07 | 2007-03-29 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2003234512A Division AU2003234512A1 (en) | 2002-05-07 | 2003-05-05 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2010200335A Division AU2010200335B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2007201387A1 AU2007201387A1 (en) | 2007-04-19 |
| AU2007201387B2 true AU2007201387B2 (en) | 2009-10-29 |
Family
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Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2007201387A Ceased AU2007201387B2 (en) | 2002-05-07 | 2007-03-29 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
| AU2007231897A Ceased AU2007231897B2 (en) | 2002-05-07 | 2007-11-09 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
| AU2010200335A Ceased AU2010200335B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
| AU2010200334A Ceased AU2010200334B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2007231897A Ceased AU2007231897B2 (en) | 2002-05-07 | 2007-11-09 | Generation of user equipment identification specific scrambling code for the high speed shared control channel |
| AU2010200335A Ceased AU2010200335B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
| AU2010200334A Ceased AU2010200334B2 (en) | 2002-05-07 | 2010-01-29 | Generation of user equipment identification |
Country Status (1)
| Country | Link |
|---|---|
| AU (4) | AU2007201387B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8483215B2 (en) * | 2011-11-08 | 2013-07-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for identifying other user equipment operating in a wireless communication network |
-
2007
- 2007-03-29 AU AU2007201387A patent/AU2007201387B2/en not_active Ceased
- 2007-11-09 AU AU2007231897A patent/AU2007231897B2/en not_active Ceased
-
2010
- 2010-01-29 AU AU2010200335A patent/AU2010200335B2/en not_active Ceased
- 2010-01-29 AU AU2010200334A patent/AU2010200334B2/en not_active Ceased
Non-Patent Citations (2)
| Title |
|---|
| 3GPP TS 25.212 V5.0.0 (2002) "Multiplexing and channel coding (FDD)" release 5 * |
| Motorola: "Performance of the HS-SCCH" 8 April 2002 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2010200335A1 (en) | 2010-02-18 |
| AU2010200335B2 (en) | 2013-03-14 |
| AU2007201387A1 (en) | 2007-04-19 |
| AU2007231897B2 (en) | 2011-02-24 |
| AU2007231897A1 (en) | 2007-11-29 |
| AU2010200334B2 (en) | 2011-08-25 |
| AU2010200334A1 (en) | 2010-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |