Methods of multipath acquisition for dedicated traffic channels

• US 20070015541A1
• Filed: 07/13/2005
• Published: 01/18/2007
• Est. Priority Date: 07/13/2005
• Status: Active Grant

• Current Assignee: Meta Platforms, Inc. (f/k/a Facebook, Inc.)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Dominique, Francis, Kong, Hongwei
• Granted Patent: US 7,929,499 B2
• Time in Patent Office: Days
• US Class Current: 455/561
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception

Abstract

In a method of multipath acquisition for a dedicated traffic channel, path positions of the traffic channel that have desired signal energy for processing in a base station receiver may be determined as a function of information contained in a data part of the traffic channel.

Claims

1. A method of multipath acquisition for a dedicated uplink traffic channel, comprising:

determining path positions of the traffic channel having desired signal energy for processing in a base station receiver as a function of at least information contained in a data part of the traffic channel.

2. The method of claim 1, wherein the information contained in the data part is a Dedicated Physical Data CHannel (DPDCH) signal and decoded bits in the DPDCH are recoded as symbols for removing the data-dependency of the DPDCH signal.

3. The method of claim 1, wherein the traffic channel includes pilot signal information in a control part therein.

4. The method of claim 3, wherein the data part is a DPDCH or a Fundamental CHannel/Supplemental CHannel (FCH/SCH) and the control part is a Dedicated Physical Control CHannel (DPCCH) or a pilot/power control sub-channel.

5. The method of claim 3, wherein the desired signal energy for a given path position is one of a DPCCH frame energy value determined from the control part and a user energy value determined by combining a DPDCH energy value calculated from the data part and the DPCCH frame energy.

6. The method of claim 5, wherein determining includes:

comparing one of the DPCCH frame energy and the user energy values for each path position to a given threshold, and

reporting path positions having one of the DPCCH frame energy or user energy values exceeding the threshold to processing circuitry within the base station receiver.

7. The method of claim 2, wherein the DPDCH is configured to be segmented based on user mobility.

8. The method of claim 1, wherein determining path positions of the traffic channel having desired signal energy includes calculating a DPDCH frame energy value for each given path position.

9. The method of claim 8, wherein calculating includes:

descrambling and despreading a filtered DPDCH signal output of the traffic channel frame that is received by the receiver and which corresponds to a given path position, and removing the data-dependency of the DPDCH using re-encoded DPDCH symbols of the frame so as to output first and second output symbols corresponding to the DPDCH signal;

accumulating the first output symbols in a first given segment of a slot of the frame to output a first accumulated data signal and the second output signals in a second given segment of the frame to output a second accumulated data signal

calculating L2 norms for the first and second accumulated data signals to generate a plurality of input signals, and

accumulating the input signals over a given duration to generate a desired DPDCH frame energy value for the given path position.

10. A method of multipath acquisition for a dedicated uplink traffic channel, comprising:

determining path positions of the traffic channel that have desired signal energy for processing in a base station receiver based on a DPDCH signal contained in the traffic channel and on information contained in a control part of the traffic channel.

11. A method of calculating frame energy of a dedicated uplink traffic channel frame for multipath acquisition of one or more path positions of the frame that are received by a base station receiver, comprising:

descrambling and despreading a filtered DPDCH signal output of the traffic channel frame that is received by the receiver and which corresponds to a given path position, and removing the data-dependency of the DPDCH using re-encoded DPDCH symbols of the frame so as to output first and second output symbols corresponding to the DPDCH signal,

accumulating the first output symbols in a first given segment of a slot of the frame to output a first accumulated data signal and the second output signals in a second given segment of the frame to output a second accumulated data signal,

calculating L2 norms for the first and second accumulated data signals to generate a plurality of input signals, and

accumulating the input signals over a given duration to generate a desired DPDCH frame energy value for the given path position.

12. A method of determining valid paths for a dedicated uplink traffic channel received at a base station receiver, comprising, for each given path position:

determining a DPCCH frame energy value based on information contained in a control part of a frame of the traffic channel,

determining a DPDCH frame energy value over a given duration based on information contained in a data part of the frame,

combining the DPCCH and DPDCH frame energy values to generate a user energy value over the given duration,

comparing one of the DPCCH frame energy and the user energy values for each given path position to a given threshold, and

reporting path positions having one of the DPCCH frame energy or user energy values exceeding the threshold to processing circuitry within the base station receiver.

13. The method of claim 12, wherein the given duration is a maximum transmission time interval (TTI) of all transport channels contained in the DPDCH.

14. The method of claim 12, wherein

the user energy value is compared to the given threshold, else

the DPCCH frame energy value is compared to the threshold for a given path position where the user energy value is not available so as to maintain a given update frequency for the path positions.