The present invention relates to wireless communication systems. More 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.
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 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 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-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 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 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.
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.
A base station for use in a code division multiple access communication system comprises circuitry configured to process a user equipment identification (UE ID) by 1/2 rate convolutionally encoding the UE ID to produce a sequence. The sequence is used by the base station for scrambling a high speed shared control channel (HS-SCCH). The base station is configured to transmit a wireless signal. The wireless signal provides the user equipment with payload data carried on a high speed physical downlink shared channel (HS-PDSCH). The HS-PDSCH is associated with the HS-SCCH.
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 (W-CDMA) communication system, the invention can be applied to other code division multiple access communication systems.
To reduce the length of the code to a preferred length of 40 bits, eight bits are preferably punctured.
This application is a continuation of U.S. patent application Ser. No. 12/467,694 filed May 18, 2009, which issued as U.S. Pat. No. 7,970,127 on Jun. 28, 2011; which is a continuation of U.S. patent application Ser. No. 11/796,534 filed Apr. 24, 2007 [sic], which issued as U.S. Pat. No. 7,536,013 on May 19, 2009; which is a continuation of U.S. patent application Ser. No. 10/779,431, filed Feb. 13, 2004, which issued as U.S. Pat. No. 7,349,540 on Mar. 25, 2008; which is a continuation of U.S. patent application Ser. No. 10/187,640, filed Jul. 1, 2002, which issued as U.S. Pat. No. 6,973,579 on Dec. 6, 2005, which claims priority from U.S. Provisional Application No. 60/378,170, filed May 13, 2002, and U.S. Provisional Application No. 60/378,509, filed May 7, 2002, which are incorporated by reference as if fully set forth.
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Number | Date | Country | |
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20110255475 A1 | Oct 2011 | US |
Number | Date | Country | |
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60378170 | May 2002 | US | |
60378509 | May 2002 | US |
Number | Date | Country | |
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Parent | 12467694 | May 2009 | US |
Child | 13168809 | US | |
Parent | 11796534 | Apr 2007 | US |
Child | 12467694 | US | |
Parent | 10779431 | Feb 2004 | US |
Child | 11796534 | US | |
Parent | 10187640 | Jul 2002 | US |
Child | 10779431 | US |