TFC and E-TFC selection for a user equipment

• US 20070140179A1
• Filed: 02/12/2007
• Published: 06/21/2007
• Est. Priority Date: 01/09/2004
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zhang, Guodong, Terry, Stephen, Dick, Stephen
• Granted Patent: US 7,522,557 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/286 during data packet transmission, e.g. high speed packet access [HSPA]
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal

Abstract

A user equipment determines transport format combinations (TFCs) that are available for at a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment. A TFC is selected from the available TFCs for the DCH. Based on a remaining power after the TFC selecting, enhanced uplink TFCs (E-TFCs) are selected that are available for an enhanced dedicated channel (E-DCH). An E-TFC is selected for the E-DCH from the available E-TFCs.

Claims

1. A method for use by a user equipment, the method comprising:

determining transport format combinations (TFCs) that are available for at a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment;

selecting a TFC from the available TFCs for the DCH;

based on a remaining power after the TFC selecting, determining enhanced uplink TFCs (E-TFCs) that are available for an enhanced dedicated channel (E-DCH);

selecting an E-TFC for the E-DCH from the available E-TFCs; and

transmitting the DCH as formatted per the selected TFC and the E-DCH as formatted per the selected E-TFC.

2. The method of claim 1 wherein the selecting the TFC and the E-TFC occurs on a transmit time interval (TTI) basis.

3. The method of claim 1 comprising providing a minimum set of E-TFCs which can be selected for the E-DCH when the required power of an E-TFC of the minimum set would result in the user equipment exceeding the maximum transmit power.

4. The method of claim 3 wherein a transmission power level of the transmitted E-DCH is scaled when the maximum transmit power would be exceeded without the E-DCH transmit power being scaled.

5. A user equipment comprising:

a transport format combination (TFC) selection unit determines transport format combinations (TFCs) that are available for at a dedicated channel (DCH) based on at least a maximum transmit power for the user equipment, the TFC selection unit selects a TFC from the available TFCs for transmission of the DCH, the TFC selection unit based on a remaining power after the TFC selecting, determines enhanced uplink TFCs (E-TFCs) that are available for an enhanced dedicated channel (E-DCH), selects an E-TFC for transmission of the E-DCH from the available E-TFCs.

6. The user equipment of claim 5 wherein the user equipment is configured to transmit the DCH as formatted per the selected TFC and the E-DCH as formatted per the selected E-TFC.

7. The user equipment of claim 5 wherein the TFC selection unit selects the TFC and the E-TFC on a transmit time interval (TTI) basis.

8. The user equipment of claim 5 wherein the TFC selection unit is configured such that a minimum set of E-TFCs can be selected for the E-DCH when the required power of an E-TFC of the minimum set exceeds the maximum transmit power.

9. The user equipment of claim 8 wherein the user equipment scales a transmission power level of the transmitted E-DCH when the maximum transmit power would be exceeded without the E-DCH transmit power being scaled.

10. The user equipment of claim 5 comprising a transmit power estimation unit configured to calculate a transmission power level associated with TFCs and E-TFCs.

11. The user equipment of claim 10 comprising a measurement unit configured to take physical measurements.

12. The user equipment of claim 11 wherein the transmit power estimation unit uses the physical measurements and a gain factor associated with TFCs and E-TFCs to calculate a transmission power level associated with the TFCs and E-TFCs.

13. The user equipment of claim 5 wherein the TFC selection unit is on an integrated circuit.