that is claim 1 thru the patent summary.. They all relate to what the expert testified about in his construction in my opinion. The noose is getting tighter.

United States Patent 7,970,127
Dick , et al. June 28, 2011

--------------------------------------------------------------------------------
User equipment identification specific scrambling

Abstract
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 code. The code 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.

--------------------------------------------------------------------------------
Inventors: Dick; Stephen G. (Nesconset, NY), Bolourchi; Nader (Larchmont, NY), Shin; Sung-Hyuk (Northvale, NJ)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 12/467,694
Filed: May 18, 2009

--------------------------------------------------------------------------------

Claims

--------------------------------------------------------------------------------

What is claimed is:

1. A wideband code division multiple access (WCDMA) user equipment (UE) comprising: circuitry in the WCDMA LTE configured to process a high speed shared control channel (HS-SCCH); and circuitry in the WCDMA UE configured to recover payload data from a high speed physical downlink shared channel (HS-PDSCH) associated with the HS-SCCH in response to the HS-SCCH including bits; wherein the bits are a result of a combining of a user specific scrambling sequence associated with the UE with control information; and wherein the user specific scrambling sequence is a result of a 1/2 rate convolutional encoding of a UE identification (ID).

2. The WCDMA UE of claim 1 wherein the control information includes channelization and modulation information of the HS-PDSCH.

3. The WCDMA UE of claim 1 wherein the user specific scrambling sequence is a result of rate matching the 1/2 rate convolutional encoded UE ID.

4. The WCDMA UE of claim 1 wherein the control information is convolutionally encoded.

5. The WCDMA UE of claim 1 wherein the payload data of the associated HS-PDSCH is not recovered if the bits were not a result of combining the user specific scrambling sequence associated with the UE with the control information.

6. The WCDMA UE of claim 1 comprising circuitry in the WCDMA UE configured to produce the user specific scrambling sequence.

7. The WCDMA UE of claim 6 wherein the circuitry in the WCDMA UE configured to produce the user specific scrambling sequence comprises a 1/2 rate convolutional encoder.

8. A method for use in a wideband code division multiple access (WCDMA) user equipment (UE), the method comprising: processing a high speed shared control channel (HS-SCCH); and recovering payload data from a high speed physical downlink shared channel (HS-PDSCH) associated with the HS-SCCH in response to the HS-SCCH including bits; wherein the bits are a result of a combining of a user specific scrambling sequence associated with the UE with control information; and wherein the user specific scrambling sequence is a result of a 1/2 rate convolutional encoding of a UE identification (ID).

9. The method of claim 8 wherein the control information includes channelization and modulation information of the HS-PDSCH.

10. The method of claim 8 wherein the user specific scrambling sequence is a result of rate matching the 1/2 rate convolutional encoded UE ID.

11. The method of claim 8 wherein the control information is convolutionally encoded.

12. The method of claim 8 wherein the payload data of the associated HS-PDSCH is not recovered if the bits were not a result of combining the user specific scrambling sequence associated with the UE with the control information.

13. The method of claim 8 comprising producing the user specific scrambling sequence.

14. The method of claim 13 wherein the user specific scrambling sequence is produced using a 1/2 rate convolutional encoder.
--------------------------------------------------------------------------------

Description

--------------------------------------------------------------------------------

BACKGROUND

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.

SUMMARY

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 code. The code 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.