Apparatus and methods for wireless communication transmission power control that supports physical channel reconfiguration

• US 7,373,164 B2
• Filed: 09/23/2004
• Issued: 05/13/2008
• Est. Priority Date: 09/26/2003
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Iacono, Ana Lucia, Dennean, Charles, McNally, John Mathisen, Stern-Berkowitz, Janet
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): Hsieh; Ping Y
• Application Number:
  US10/948,714
• Publication Number:
  US 20050069044A1
• Time in Patent Office: 1,328 Days
• Field of Search: 455/522, 455/69, 455/571, 455/127.1, 370/311, 370/335, 370/342
• US Class Current: 455/522
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

Apparatus and methods for wireless communication transmission power control are provided. Determination of gain factors and adjustments for physical channel reconfiguration in the context of transmission power control are addressed. Preferably, implementation is in conjunction with communication systems in which wireless communications are conducted between wireless transmit receive units (WTRUs) using multiple channels that are concurrently transmitted.

Claims

1. A method of transmission power control for a wireless transmit receive unit (WTRU) that transmits communication signals in a forward composite channel carrying data in a selected combination of channels with respect to a selected physical transmission configuration of the forward composite channel, the method comprising:

transmitting communication signals in the forward composite channel in a selected combination of channels with respect to a first physical transmission configuration of the forward composite channel;

determining a reference combination of channels with respect to the first physical transmission configuration of the forward composite channel;

applying a gain factor β

to the transmission of communication signals in the selected combination of channels with respect to the first physical transmission configuration of the forward composite channel where the gain factor β

is determined based on spreading factors of the selected combination of channels and the reference combination of channels with respect to the first physical transmission configuration of the forward composite channel;

reconfiguring the transmission of communication signals in the forward composite channel to transmit the signals in a selected combination of channels with respect to a second physical transmission configuration of the forward composite channel;

determining a reference combination of channels with respect to the second physical transmission configuration of the forward composite channel; and

applying a gain factor β

′

to the transmission of communication signals in the selected combination of channels with respect to the second physical transmission configuration of the forward composite channel where the gain factor β

′

is determined based on spreading factors of the selected combination of channels and the reference combination of channels with respect to the second physical transmission configuration of the forward composite channel.

2. The method of claim 1 where the WTRU is configured for use in a code division multiple access (CDMA) system, the data channels are transport channels (TrCHs) that may have different spreading factors for different physical configurations of the composite channel, the composite channel is an uplink coded composite transport channel (CCTrCH) and a transport format combination (TFC) is associated with each of a set of predefined format channel combinations of the CCTrCH defined for all physical configurations, the method wherein the reference combination of channels with respect to the first physical transmission configuration of the forward composite channel is determined to be one of set of predefined format channel combinations, TFCref1, that has an associated gain factor β

ref1 and the reference combination of channels with respect to the second physical transmission configuration of the forward composite channel is determined to be one of set of predefined format channel combinations, TFCref2, that has an associated gain factor β

ref2.

3. The method of claim 2 wherein a common TFC that yields similar puncturing/repetition for the first and second physical channel configurations is identified and the common TFC is determined to be the reference channel combination TFCref1 and also the reference channel combination TFCref2 and the gain factor β

ref2 is selected to equal the gain factor β

ref1.

4. The method of claim 2 wherein reference channel combination TFCref2 is determined by identifying a TFC that has similar puncturing/repetition for the second physical channel configuration as compared with puncturing/repetition of reference channel combination TFCref1 with respect to the first physical channel configuration and the gain factor β

ref2 is selected to equal the gain factor β

ref1.

5. The method of claim 2 wherein reference channel combination TFCref2 is selected to be the same TFC as reference channel combination TFCref1 and the gain factor β

ref2 is selected based on the gain factor β

ref1 and spreading factor changes in the reference channel combination from the first physical configuration to the second physical configuration of the forward composite channel.

6. The method of claim 5 wherein the gain factor β

ref2 is selected such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref2}}=\sqrt{\frac{L_{\mathrm{ref1}}}{L_{\mathrm{ref2}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref1}}$

where

$L_{\mathrm{ref1}}=\underset{i}{\overset{}{\sum <br><br>}}<br><br><br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum

is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref2}}=\underset{i}{\overset{}{\sum <br><br>}}<br><br><br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

7. The method of claim 2 wherein reference channel combination TFCref2 is selected to be the a different TFC as the reference channel combination TFCref1 and the gain factor β

ref2 is selected such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref2}}=\sqrt{\frac{L_{\mathrm{ref1}}}{L_{\mathrm{ref2}}}}\times <br><br>\sqrt{\frac{K_{\mathrm{ref2}}}{K_{\mathrm{ref1}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref1}}$

where;

$K_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref1 with respect to the first physical configuration;

$K_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref2 with respect to the second physical configuration;

$L_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

8. The method of claim 2 wherein:

a jth combination of channels TFCj is selected for data transmission with respect to the first physical transmission configuration on the forward composite channel and a gain factor β

j is applied that is computed for the selected combination of channels such that;

β

j=X*β

ref1 where X is based upon spreading factors of TFCj and TFCref1 with respect to the first physical transmission configuration of the forward composite channel; and

a kth combination of channels TFCk is selected for data transmission with respect to the second physical transmission configuration on the forward composite channel and a gain factor β

k is applied that is computed for the selected combination of channels such that;

β

k=X′

*β

ref2 where X′

is based upon spreading factors of TFCk and TFCref2 with respect to the second physical transmission configuration of the forward composite channel.

9. The method of claim 8 wherein a common TFC that yields similar puncturing/repetition for the first and second physical channel configurations is identified and the common TFC is determined to be the reference channel combination TFCref1 and also the reference channel combination TFCref2 and the gain factor β

ref2 is selected to equal the gain factor β

ref1.

10. The method of claim 8 wherein reference channel combination TFCref2 is determined by identifying a TFC that has similar puncturing/repetition for the second physical channel configuration as compared with puncturing/repetition of reference channel combination TFCref1 with respect to the first physical channel configuration and the gain factor β

ref2 is selected to equal the gain factor β

ref1.

11. The method of claim 8 wherein reference channel combination TFCref2 is selected to be the same TFC as reference channel combination TFCref1 and the gain factor β

ref2 is selected based on the gain factor β

ref1 and spreading factor changes in the reference channel combination from the first physical configuration to the second physical configuration of the forward composite channel.

12. The method of claim 11 wherein the gain factor β

ref2 is selected such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref2}}=\sqrt{\frac{L_{\mathrm{ref1}}}{L_{\mathrm{ref2}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref1}}$

where

$L_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel

(DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

13. The method of claim 8 wherein reference channel combination TFCref2 is selected to be the a different TFC as the reference channel combination TFCref1 and the gain factor β

ref2 is selected such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref2}}=\sqrt{\frac{L_{\mathrm{ref1}}}{L_{\mathrm{ref2}}}}\times <br><br>\sqrt{\frac{K_{\mathrm{ref2}}}{K_{\mathrm{ref1}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref1}}$

where;

$K_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref1 with respect to the first physical configuration;

$K_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref2 with respect to the second physical configuration;

$L_{\mathrm{ref}<br><br><br><br>1}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref}<br><br><br><br>2}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

14. The method of claim 8 wherein the gain factor β

j is computed such that

${\mathrm{\beta <br><br>}}_j=\sqrt{\frac{L_{\mathrm{ref}<br><br><br><br>1}}{L_j}}\times <br><br>\sqrt{\frac{K_j}{K_{\mathrm{ref}<br><br><br><br>1}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>1}$

where;

$K_{\mathrm{ref}<br><br><br><br>1}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref1;

$K_j=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where the sum is taken over all transport channels i in the TFCj;

$L_{\mathrm{ref}<br><br><br><br>1}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i and the sum is taken over all DPCH i used in TFCref1; and

$L_j=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all DPCH i used in TFCj; and

the gain factor β

k is computed such that

${\mathrm{\beta <br><br>}}_k=\sqrt{\frac{L_{\mathrm{ref}<br><br><br><br>2}}{L_k}}\times <br><br>\sqrt{\frac{K_k}{K_{\mathrm{ref}<br><br><br><br>2}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>2}$

where;

$K_{\mathrm{ref}<br><br><br><br>2}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref2;

$K_k=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where the sum is taken over all transport channels i in the TFCk;

$L_{\mathrm{ref}<br><br><br><br>2}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i and the sum is taken over all DPCH i used in TFCref2; and

$L_k=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all DPCH i used in TFCk.

15. A wireless transmit receive unit (WTRU) comprising:

a transmitter configured to transmit communication signals in a forward composite channel carrying data in a selected combination of channels with respect to a selected physical transmission configuration of the forward composite channel;

a processor configured to make forward channel power adjustments as a function of target metrics computed based on the data signals as received over the forward channel in conjunction with applying a gain factor based on a reference combination of channels with respect to the selected physical transmission configuration of the forward composite channel;

said transmitter configured to reconfigure the transmission of communication signals in the forward composite channel from transmission in a first selected combination of channels with respect to a first physical transmission configuration of the forward composite channel to transmission in a second selected combination of channels with respect to a second physical transmission configuration of the forward composite channel;

said processor configured to compute and apply a gain factor β

to the transmission of communication signals in the first selected combination of channels with respect to the first physical transmission configuration of the forward composite channel such that the gain factor β

is determined based on spreading factors of the first selected combination and a reference combination of channels with respect to the first physical transmission configuration of the forward composite channel; and

said processor configured to compute and apply a gain factor β

′

to the transmission of communication signals in the second selected combination of channels with respect to the second physical transmission configuration of the forward composite channel where the gain factor β

′

is determined based on spreading factors of the second selected combination and a reference combination of channels with respect to the second physical transmission configuration of the forward composite channel.

16. The WTRU of claim 15 configured for use in a code division multiple access (CDMA) system where the data channels are transport channels (TrCHs) that may have different spreading factors for different physical configurations of the composite channel, the composite channel is an uplink coded composite transport channel (CCTrCH) and a transport format combination (TFC) is associated with each of a set of predefined format channel combinations of the CCTrCH defined for all physical configurations, wherein the processor is configured to select a reference combination of channels, TFCref1, with respect to the first physical transmission configuration of the forward composite channel from the set of predefined format channel combinations, that has an associated gain factor β

ref1 and a reference combination of channels, TFCref2, with respect to the second physical transmission configuration of the forward composite channel from the set of predefined format channel combinations that has an associated gain factor β

ref2.

17. The WTRU of claim 16 wherein the processor is configured to identify a common TFC that yields similar puncturing/repetition for the first and second physical channel configurations and to select the common TFC as the reference channel combination TFCref1 and also the reference channel combination TFCref2 and to select the gain factor β

ref2 to equal the gain factor β

ref1.

18. The WTRU of claim 16 wherein the processor is configured to select the reference channel combination TFCref2 by identifying a TFC that has similar puncturing/repetition for the second physical channel configuration as compared with puncturing/repetition of reference channel combination TFCref1 with respect to the first physical channel configuration and to select the gain factor β

ref2 to equal the gain factor β

ref1.

19. The WTRU of claim 16 wherein the processor is configured to select the reference channel combination TFCref2 to be the same TFC as the reference channel combination TFCref1 and to compute the gain factor β

ref2 based on the gain factor β

ref1 and spreading factor changes in the reference channel combination from the first physical configuration to the second physical configuration of the forward composite channel.

20. The WTRU of claim 19 wherein the processor is configured to compute the gain factor β

ref2 such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>2}=\sqrt{\frac{L_{\mathrm{ref}<br><br><br><br>1}}{L_{\mathrm{ref}<br><br><br><br>2}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>1}$

where

$L_{\mathrm{ref}<br><br><br><br>1}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref}<br><br><br><br>2}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

21. The WTRU of claim 16 wherein the processor is configured to select the reference channel combination TFCref2 to be the a different TFC from the reference channel combination TFCref1 and to compute the gain factor β

ref2 such that

${\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>2}=\sqrt{\frac{L_{\mathrm{ref}<br><br><br><br>1}}{L_{\mathrm{ref}<br><br><br><br>2}}}\times <br><br>\sqrt{\frac{K_{\mathrm{ref}<br><br><br><br>2}}{K_{\mathrm{ref}<br><br><br><br>1}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}<br><br><br><br>1}$

where;

$K_{\mathrm{ref}<br><br><br><br>1}<br><br>\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref1 with respect to the first physical configuration;

$K_{\mathrm{ref}<br><br><br><br>2}<br><br>\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref2 with respect to the second physical configuration;

$L_{\mathrm{ref}<br><br><br><br>1}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref1; and

$L_{\mathrm{ref}<br><br><br><br>2}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref2.

22. The WTRU of claim 16 where one of the format channel combinations is a selected reference combination of channel, TFCref, and a jth combination of channels TFCj is the selected channel combination for data transmission on the forward composite channel wherein the processor is configured to apply and compute a gain factor β

j for the selected combination of channels TFCj such that;

β

_j=X×

β

_ref.

23. A method of transmission power control for a wireless transmit receive unit (WTRU) that transmits communication signals in a forward composite channel carrying data in a selected combination of channels with respect to a selected physical transmission configuration of the forward composite channel where the WTRU is configured to make forward channel power adjustments as a function of target metrics computed based on the data signals as received over the forward channel in conjunction with applying a gain factor based on a reference combination of channels with respect to the selected physical transmission configuration of the forward composite channel, the method comprising:

determining a reference combination of channels with respect to the forward composite channel;

transmitting communication signals in the forward composite channel in a selected combination of channels with respect to a first physical transmission configuration of the forward composite channel;

using the reference combination of channels of the forward composite channel for determining a gain factor β

to apply to the transmission of communication signals in the selected combination of channels with respect to the first physical transmission configuration of the forward composite channel;

making forward channel power adjustments as a function of target metrics computed based on the data signals as received over the forward channel with respect to the first physical transmission configuration of the forward composite channel;

reconfiguring the transmission of communication signals in the forward composite channel to transmit the signals in a selected combination of channels with respect to a second physical transmission configuration of the forward composite channel in conjunction with adjusting the forward channel transmission power based on an updated target metric computed as a function of spreading factor changes in the reference channel combination from the first physical configuration to the second physical configuration of the forward composite channel; and

using the reference combination of channels with respect to the second physical transmission configuration of the forward composite channel for determining a gain factor β

′

to apply to the transmission of communication signals in the selected combination of channels with respect to the second physical transmission configuration of the forward composite channel.

24. The method of claim 23 where the WTRU is configured for use in a code division multiple access (CDMA) system, the data channels are transport channels (TrCHs) that may have different spreading factors for different physical configurations of the composite channel, the composite channel is an uplink coded composite transport channel (CCTrCH), a transport format combination (TFC) is associated with each of a set of predefined format channel combinations of the CCTrCH defined for all physical configurations and Signal to Interference Ratio (SIR) metrics of the transmitted communication signals as received are used to compute a target SIR upon which forward channel power adjustments are based, the method wherein the reference combination of channels of the forward composite channel is determined to be one of the set of predefined format channel combinations, TFCref, that has an associated gain factor β

ref and the updated target metric used in adjusting the forward channel transmission power in conjunction with reconfiguration is an updated target SIR.

25. The method of claim 24 wherein the updated target SIR, SIR_target_new, is computed such that

${\mathrm{SIR\_target}}_{\mathrm{new}}={\mathrm{SIR\_target}}_{\mathrm{old}}+10$

⁢

log ⁡

( L ref2 L ref1 )

where

SIR_target_old is the most recently used target metric for making forward channel power adjustments with respect to the first physical transmission configuration of the forward composite channel;

$L_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref; and

$L_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref.

26. The method of claim 24 wherein:

a jth combination of channels TFCj is selected for data transmission with respect to the first physical transmission configuration on the forward composite channel and a gain factor β

j is applied that is computed for the selected combination of channels such that;

β

j=X*β

ref where X is based upon spreading factors of TFCj and TFCref with respect to the first physical transmission configuration of the forward composite channel; and

a kth combination of channels TFCk is selected for data transmission with respect to the second physical transmission configuration on the forward composite channel and a gain factor β

k is applied that is computed for the selected combination of channels such that;

β

k=X′

*β

ref where X′

is based upon spreading factors of TFCk and TFCref with respect to the second physical transmission configuration of the forward composite channel.

27. The method of claim 26 wherein the gain factor β

j is computed such that

${\mathrm{\beta <br><br>}}_j=\sqrt{\frac{L_{\mathrm{ref1}}}{L_j}}\times <br><br>\sqrt{\frac{K_j}{K_{\mathrm{ref1}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}}$

where;

$K_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref;

$K_j=\underset{j}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where the sum is taken over all transport channels i in the TFCj;

$L_{\mathrm{ref1}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i and the sum is taken over all DPCH i used in TFCref with respect to said first physical configuration; and

$L_j=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all DPCH i used in TFCj with respect to said first physical configuration; and

the gain factor β

k is computed such that

${\mathrm{\beta <br><br>}}_k=\sqrt{\frac{L_{\mathrm{ref2}}}{L_k}}\times <br><br>\sqrt{\frac{K_k}{K_{\mathrm{ref2}}}}\times <br><br>{\mathrm{\beta <br><br>}}_{\mathrm{ref}}$

where;

$K_{\mathrm{ref2}}=\underset{i}{\sum <br><br>}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in TFCref;

$K_k=\underset{i}{\overset{}{\sum <br><br>}}<br><br>{\mathrm{RM}}_i\times <br><br>N_i$

where the sum is taken over all transport channels i in the TFCk;

$L_{\mathrm{ref2}}=\underset{i}{\overset{}{\sum <br><br>}}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i and the sum is taken over all DPCH i used in TFCref with respect to said second physical configuration; and

$L_k=\underset{i}{\overset{}{\sum <br><br>}}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all DPCH i used in TFCk with respect to said second physical configuration.

28. A wireless transmit receive unit (WTRU) comprising:

a transmitter configured to transmit communication signals in a forward composite channel carrying data in a selected combination of channels with respect to a selected physical transmission configuration of the forward composite channel;

a processor configured to make forward channel power adjustments as a function of target metrics computed based on the communication signals as received over the forward channel in conjunction with applying a gain factor based on a reference combination of channels with respect to the selected physical transmission configuration of the forward composite channel; and

said transmitter configured to reconfigure the transmission of communication signals in the forward composite channel from transmission in a first selected combination of channels with respect to a first physical transmission configuration of the forward composite channel to transmission in a second selected combination of channels with respect to a second physical transmission configuration of the forward composite channel in conjunction with the processor adjusting the forward channel transmission power based on an updated target metric computed as a function of spreading factor changes in the reference channel combination from the first physical configuration to the second physical configuration of the forward composite channel.

29. The WTRU of claim 28 wherein the processor is further configured to use the reference combination of channels of the forward composite channel for determining a gain factor β

to apply to the transmission of communication signals in selected combination of channels of the forward composite channel.

30. The WTRU of claim 29 configured for use in a code division multiple access (CDMA) system where the data channels are transport channels (TrCHs) that may have different spreading factors for different physical configurations of the composite channel, the composite channel is an uplink coded composite transport channel (CCTrCH), a transport format combination (TFC) is associated with each of a set of predefined format channel combinations of the CCTrCH defined for all physical configurations, the reference combination of channels of the forward composite channel, TFCref, is one of the set of predefined format channel combinations and has an associated gain factor β

ref and where Signal to Interference Ratio (SIR) metrics of the transmitted communication signals as received are used to compute a target SIR upon which forward channel power adjustments are based, the WTRU wherein the processor is configured to use an updated target SIR as the updated target metric used in adjusting the forward channel transmission power in conjunction with transmission reconfiguration.

31. The WTRU of claim 30 wherein the processor is configured to compute the updated target SIR, SIR_target_new, such that

${\mathrm{SIR\_target}}_{\mathrm{new}}={\mathrm{SIR\_target}}_{\mathrm{old}}+10$

⁢

log ⁢

⁢

( L ref2 L ref1 )

where

SIR_target_old is the most recently used target metric for making forward channel power adjustments with respect to the first physical transmission configuration of the forward composite channel;

$L_{\mathrm{ref1}}=\underset{i}{\overset{}{\sum <br><br>}}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the first physical configuration and the sum is taken over all DPCH i used in TFCref; and

$L_{\mathrm{ref2}}=\underset{i}{\overset{}{\sum <br><br>}}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SFi is a spreading factor of a dedicated physical channel (DPCH) i with respect to the second physical configuration and the sum is taken over all DPCH i used in TFCref.

32. The WTRU of claim 30 wherein the processor is configured such that, when a jth combination of channels TFCj is selected for data transmission with respect to a current physical transmission configuration on the forward composite channel, a gain factor β

j is computed and applied for the selected combination of channels such that;

β

j=X*β

ref where X is based upon spreading factors of TFCj and TFCref with respect to the current physical transmission configuration of the forward composite channel.

33. A wireless transmit receive unit (WTRU) configured for use in a code division multiple access (CDMA) system in which data is communicated via transport channels (TrCHs) of a coded composite transport channel (CCTrCH) in a selected transport format combination (TFC) associated with a set of predefined format channel combinations where a gain factor β

is applied for transmitter power control for a combination of channels that is selected for data transmission, the WTRU comprising;

a processor configured to compute a gain factor β

j for a j-th TFC which is not the same as a reference TFC such that

${\mathrm{\beta <br><br>}}_j={\mathrm{\beta <br><br>}}_{\mathrm{ref}}·<br><br>\sqrt{\frac{L_{\mathrm{ref}}}{L_j}}·<br><br>\sqrt{\frac{K_j}{K_{\mathrm{ref}}}}$

where;

β

ref is a gain factor for the reference TFC;

$K_{\mathrm{ref}}=\underset{i}{\sum <br><br>}<br><br><br><br>{\mathrm{RM}}_i·<br><br>N_i$

where RMi is a semi-static rate matching attribute for transport channel i, Ni is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in the reference TFC;

$K_j=\underset{i}{\sum <br><br>}<br><br><br><br>{\mathrm{RM}}_i·<br><br>N_i$

where the sum is taken over all transport channels i in the j-th TFC;

$L_{\mathrm{ref}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SF_i is a spreading factor of a type of physical channel i and the sum is taken over all such physical channels i used in the reference TFC; and

$L_j=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all such physical channels i used in the j-th TFC.

34. The WTRU according to claim 33 wherein the processor is configured to compute the gain factor β

j for the j-th TFC where the type of physical channel i is a dedicated physical channel (DPCH).

35. A method for a wireless transmit receive unit (WTRU) configured for use in a code division multiple access (CDMA) system in which data is communicated via transport channels (TrCHs) of a coded composite transport channel (CCTrCH) in a selected transport format combination (TFC) associated with a set of predefined format channel combinations where a gain factor β

is applied for transmitter power control for a combination of channels that is selected for data transmission, the method comprising;

computing a gain factor β

j for a j-th TFC which is not the same as a reference TFC such that

${\mathrm{\beta <br><br>}}_j={\mathrm{\beta <br><br>}}_{\mathrm{ref}}·<br><br>\sqrt{\frac{L_{\mathrm{ref}}}{L_j}}·<br><br>\sqrt{\frac{K_j}{K_{\mathrm{ref}}}}$

where;

β

ref is a gain factor for the reference TFC;

$K_{\mathrm{ref}}=\underset{i}{\sum <br><br>}<br><br><br><br>{\mathrm{RM}}_i·<br><br>N_i$

where RM_i is a semi-static rate matching attribute for transport channel i, N_i is the number of bits output from a radio frame segmentation block for transport channel i and the sum is taken over all transport channels i in the reference TFC;

$K_j=\underset{i}{\sum <br><br>}<br><br><br><br>{\mathrm{RM}}_i·<br><br>N_i$

where the sum is taken over all transport channels i in the j-th TFC;

$L_{\mathrm{ref}}=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where SF_i is a spreading factor of a type of physical channel i and the sum is taken over all such physical channels i used in the reference TFC; and

$L_j=\underset{i}{\sum <br><br>}<br><br>\frac{1}{{\mathrm{SF}}_i}$

where the sum is taken over all such physical channels i used in the j-th TFC.

36. The method according to claim 35 wherein the gain factor β

j is computed for the j-th TFC where the type of physical channel i is a dedicated physical channel (DPCH).