Selection of transmission parameters for transmit diversity terminals
Disclosed herein are system and method embodiments for selection of transmission parameters for transmit diversity terminals. According to an aspect, a method for controlling wireless receive/transmit unit transmission parameters may include configuring a WRTU to transmit dual stream when a first stream is using a predetermined transport format (TF) or subset of the TF. The method may also include applying the configuration to the WRTU.
1. A method implemented in a Wireless Transmit/Receive Unit (WTRU) for transport format combination selection for uplink (UL) Multiple Input Multiple Output (MIMO) operations comprising a primary stream and a secondary stream, the method comprising:
calculating a Normalized Remaining Power Margin (NRPM) applicable to the primary stream;
calculating a set of supported Enhanced Transport Format Combination Indices (E-TFCIs) for the primary stream based on the NRPM;
selecting one of the supported E-TFCIs for the primary stream;
determining a rank for UL transmissions based on at least a threshold; and
if the rank is 2, determining a number of bits of data on the secondary stream based on the selected primary stream E-TFCI and an offset signaled by a NodeB;
wherein the offset is based on a Δ MIMO signaled by the NodeB, wherein Δ MIMO is a relative difference between the primary stream and the secondary stream.
2. The method of claim 1 wherein the determining of the number of bits of data on the secondary stream comprises determining a transport block size for the secondary stream.
3. The method of claim 1 wherein the determining of the number of bits of data on the secondary stream comprises determining an E-TFCI for the secondary stream.
4. The method of claim 1 further comprising:
transmitting non-scheduled data on the primary stream.
5. The method of claim 1 wherein calculating the NRPM applicable to the primary stream comprises calculating half of a total NRPM for at least one E-TFCI.
6. The method of claim 1 wherein the calculating the NRPM applicable to the primary stream comprises calculating:
NRPM 1,j =0.5*( PMax j −P DPCCH,target −P S-DPCCH,target −P DPDCH −P HS-DPCCH −P E-DPCCH,j −P S−E−DPCCH,j )/ P DPCCH,target
where:
NRPM 1,j is the Normalized Remaining Power Margin applicable to the primary stream;
PMax j is a maximum power allowed;
P DPCCH,target is an estimated Dedicated Physical Data Channel (DPCCH) power target;
P S-DPCCH , target is an estimated Secondary (S)-DPCCH power target;
P DPDCH is the power of the DPDCH;
P HS-DPCCH is the power of the High Speed (HS)-DPCCH;
P E-DPCCH,j is the power of the E-DPCCH for E-TFCIj on the primary stream; and
P S-E-DPCCH,j is the power of the secondary stream E-DPCCH (S-DPCCH) for E-TFCIj on the primary stream.
7. The method of claim 1 wherein the threshold comprises a number of bits that can be transmitted on the secondary stream.
8. The method of claim 7 wherein the determining the rank is further based on a secondary power offset.
9. The method of claim 7 wherein determining the number of bits of data on the secondary stream comprises:
calculating the number of bits that can be transmitted on the secondary stream using a HARQ offset associated with a highest priority non-empty logical channel.
10. The method of claim 7 further comprising: receiving the threshold via Radio Resource Control (RRC) signaling.
11. The method of claim 1 wherein the threshold comprises a number of bits that can be transmitted on the secondary stream according to a serving grant.
12. The method of claim 1 wherein the offset is based on a received power as measured by the NodeB.
13. A Wireless Transmit/Receive Unit (WTRU) comprising:
a transmitter;
a receiver; and
a processor configured to perform transport format combination selection for uplink (UL) Multiple Input Multiple Output (MIMO) operations comprising a primary stream and a secondary stream, by:
calculating a Normalized Remaining Power Margin (NRPM) applicable to the primary stream;
calculating a set of supported Enhanced Transport Format Combination Indices (E-TFCIs) for the primary stream based on the NRPM;
selecting one of the supported E-TFCIs for the primary stream;
determining a rank for UL transmissions based on at least a threshold; and if the rank is 2, determining a number of bits of data on the secondary stream based on the selected primary stream E-TFCI and an offset signaled by a NodeB;
wherein the offset is based on a Δ MIMO signaled by the NodeB, wherein Δ MIMO is a relative difference between the primary stream and the secondary stream.
14. The WTRU of claim 13 wherein the processor is configured to determine the number of bits of data on the secondary stream by determining a transport block size for the secondary stream.
15. The WTRU of claim 13 wherein the processor is configured to determine the number of bits of data on the secondary stream by determining an E-TFCI for the secondary stream.
16. The WTRU of claim 13 wherein the processor is further configured to cause the transmitter to transmit non-scheduled data only on the primary stream.
17. The WTRU of claim 13 wherein the processor is configured to calculate the NRPM applicable to the primary stream by calculating half of a total NRPM for at least one E-TFCI.
18. The WTRU of claim 13 wherein the processor is configured to calculate the NRPM applicable to the primary stream by calculating:
NRPM 1,j =0.5*( PMax j −P DPCCH,target −P S-DPCCH,target −P DPDCH −P HS-DPCCH −P E-DPCCH,j −P S−E−DPCCH,j )/ P DPCCH,target
where:
NRPM 1,j is the Normalized Remaining Power Margin applicable to the primary stream;
PMax j is a maximum power allowed;
P DPCCH,target is an estimated Dedicated Physical Data Channel (DPCCH) power target;
P S-DPCCH , target is an estimated Secondary (S)-DPCCH power target;
P DPDCH is the power of the DPDCH;
P HS-DPCCH is the power of the High Speed (HS)-DPCCH;
P E-DPCCH,j is the power of the E-DPCCH for E-TFCIj on the primary stream; and
P S-E-DPCCH,j is the power of the secondary stream E-DPCCH (S-DPCCH) for E-TFCIj on the primary stream.
19. The WTRU of claim 13 wherein the threshold comprises a number of bits that can be transmitted on the secondary stream.
20. The WTRU of claim 19 wherein the WTRU receives the threshold via Radio Resource Control (RRC) signaling.
21. The WTRU of claim 13 wherein the threshold comprises a number of bits that can be transmitted on the secondary stream according to a serving grant.
22. The WTRU of claim 19 wherein the processor is configured to determine the rank further based on a secondary power offset.
23. The WTRU of claim 19 wherein the processor is configured to calculate the number of bits that can be transmitted on the secondary stream using a HARQ offset associated with a highest priority non-empty logical channel.
24. The WTRU of claim 13 wherein the offset is based on a received power as measured by the NodeB.