Method and system for data and voice transmission over shared and dedicated channels

• US 20060109890A1
• Filed: 01/09/2006
• Published: 05/25/2006
• Est. Priority Date: 12/22/2000
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Willenegger, Serge
• Granted Patent: US 9,461,699 B2
• Time in Patent Office: Days
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/696 relating to Dowlink
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70724 UMTS
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal

Abstract

In one disclosed embodiment, data information is stored in a buffer in a transmitter. The data information is transmitted on a shared channel and control information for recovering the associated data information is transmitted on a dedicated channel. The shared and dedicated channels can be, for example, different portions of the frequency band. The control information can include a spreading factor used to spread the data at the transmitter. For example, the spreading factor can be the length of the Walsh function orthogonal coding used to spread the data. The control information is received over the dedicated channel before the associated data information is received over the shared channel. The control information is then used to recover the associated data information. For example, knowing the spreading factor from the control information, the correct Walsh function can be selected to de-spread, i.e. to Walsh de-cover, the data information.

Claims

1. A method for transmitting first and second signals in a code division multiple access system, comprising:

including access information in said first signal for accessing said second signal;

providing first and second coded channels;

transmitting said first signal via said first coded channel;

delaying said second signal by a predetermined delay; and

transmitting said second signal via said second coded channel after said predetermined delay.

2. The method as in claim 1 further including spreading said second signal at chip level prior to said transmitting said second signal via said second coded channel and wherein said access information in said first signal comprises spreading factor information for accessing said second signal.

3. The method as in claim 2 wherein said transmitting said second signal includes transmitting a plurality of frames comprising user data and wherein each of said frame includes a different spreading factor.

4. The method as in claim 2 wherein said system being a wideband code division multiple access (WCDMA) system, said first coded channel being a dedicated physical channel (DPCH), and said second coded channel being a physical downlink shared channel (PDSCH) in said WCDMA system.

5. A method for receiving first and second signals in a code division multiple access system, comprising:

receiving said first signal via a first coded channel;

retrieving access information for said second signal from said first signal;

receiving said second signal via a second coded channel; and

accessing said second signal using access information retrieved from said first signal.

6. The method as in claim 5 wherein said access information comprises spreading factor information for accessing said second signal, said method further comprising despreading said second signal at symbol level after said accessing said second signal using said access information.

7. The method as in claim 6 wherein said system being a wideband code division multiple access (WCDMA) system, said first coded channel being a dedicated physical channel (DPCH), and said second coded channel being a physical downlink shared channel (PDSCH) in said WCDMA system.

8. An apparatus for transmitting first and second signals in a code division multiple access system, comprising:

means for including access information in said first signal for accessing said second signal;

means for providing first and second coded channels;

means for transmitting said first signal via said first coded channel;

means for delaying said second signal by a predetermined delay; and

means for transmitting said second signal via said second coded channel after said predetermined delay.

9. The apparatus as in claim 8 further including means for spreading said second signal at chip level before transmitting said second signal via said second coded channel and wherein said access information comprises spreading factor information for accessing said second signal.

10. The apparatus as in claim 9 wherein said means for transmitting said second signal includes means for transmitting a plurality of frames which comprise user data and wherein each of said frame includes a different spreading factor.

11. The apparatus as in claim 9 wherein said system being a wideband code division multiple access (WCDMA) system, said first coded channel being a dedicated physical channel (DPCH), and said second coded channel being a physical downlink shared channel (PDSCH) in said WCDMA system.

12. An apparatus for receiving first and second signals in a code division multiple access system, comprising:

means for receiving said first signal via a first coded channel;

means for retrieving access information for said second signal from said first signal;

means for receiving said second signal via a second coded channel; and

means for accessing said second signal using access information retrieved from said first signal.

13. The apparatus as in claim 12 wherein said access information comprises spreading factor information for accessing said second signal, said apparatus further including means for despreading said second signal at symbol level after accessing said second signal using said access information.

14. The method as in claim 13 wherein said system being a wideband code division multiple access (WCDMA) system, said first coded channel being a dedicated physical channel (DPCH), and said second coded channel being a physical downlink shared channel (PDSCH) in said WCDMA system.

15. An apparatus for transmitting a data signal and a signal having control information in a code division multiple access system, comprising:

a buffer for storing said data signal at symbol level;

a Walsh cover circuit connected to said buffer, said Walsh cover circuit being configured to spread said data signal at symbol level to chip level;

a first transmitter connected to said Walsh cover circuit, said transmitter being configured to transmit said data signal at chip level via a first coded channel;

a second transmitter configured to transmit said signal with control information at chip level via a second coded channel, wherein said first transmitter transmits said data signal at a predetermined delay after said second transmitter transmits said signal having control information.