Device and method for HSPA WCDMA uplink pilots
First Claim
1. A User Equipment, a UE, for an HSPA enabled WCDMA system, the UE being equipped with at least a first and a second transmit antenna, the UE being arranged to use one or more sets of pre-coding weights, each pre-coding weight in said one or more sets to be used by the UE for multiplication with information which is transmitted from one of the UE'"'"'s antennas, the UE further being arranged to receive instructions from a NodeB on the set or sets of pre-coding weights to be used, the UE also being arranged to transmit a first and a second pilot signal, and to use a first set of pre-coding weights for the first pilot signal and a second set of pre-coding weights for the second pilot signal, where the first set of pre-coding weights is the same as the UE uses for transmitting a first data stream, and to use different spreading codes for the first data stream and for the first pilot signal, and wherein an output power of the second pilot signal is offset relative to an output power of the first pilot signal, wherein the UE being arranged to receive a value of the offset from said NodeB via radio resource signaling, wherein the UE being arranged to use the pilot symbols of the WCDMA DPCCH channel as the first pilot signal, wherein the UE being arranged to use as the second pilot signal the pilot symbols of another WCDMA channel, wherein the pilot symbols of the other WCDMA channel use the same slot format as the pilot symbols of the WCDMA DPCCH channel, and wherein the UE being arranged to use different spreading codes for the WCDMA DPCCH channel and said other WCDMA channel.
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Abstract
A UE, for an HSPA WCDMA system, equipped with a first and a second transmit antenna, and arranged to use one or more sets of pre-coding weights for transmission. The UE is arranged to receive instructions from a NodeB on the set or sets of pre-coding weights to be used, and to transmit a first and a second pilot signal, and to use a first set of pre-coding weights for the first pilot signal and a second set of pre-coding weights for the second pilot signal, where the first set of pre-coding weights is the same as the UE uses for transmitting a first data stream, and to use different spreading codes for the first data stream and for the first pilot signal.
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Citations
21 Claims
- 1. A User Equipment, a UE, for an HSPA enabled WCDMA system, the UE being equipped with at least a first and a second transmit antenna, the UE being arranged to use one or more sets of pre-coding weights, each pre-coding weight in said one or more sets to be used by the UE for multiplication with information which is transmitted from one of the UE'"'"'s antennas, the UE further being arranged to receive instructions from a NodeB on the set or sets of pre-coding weights to be used, the UE also being arranged to transmit a first and a second pilot signal, and to use a first set of pre-coding weights for the first pilot signal and a second set of pre-coding weights for the second pilot signal, where the first set of pre-coding weights is the same as the UE uses for transmitting a first data stream, and to use different spreading codes for the first data stream and for the first pilot signal, and wherein an output power of the second pilot signal is offset relative to an output power of the first pilot signal, wherein the UE being arranged to receive a value of the offset from said NodeB via radio resource signaling, wherein the UE being arranged to use the pilot symbols of the WCDMA DPCCH channel as the first pilot signal, wherein the UE being arranged to use as the second pilot signal the pilot symbols of another WCDMA channel, wherein the pilot symbols of the other WCDMA channel use the same slot format as the pilot symbols of the WCDMA DPCCH channel, and wherein the UE being arranged to use different spreading codes for the WCDMA DPCCH channel and said other WCDMA channel.
- 10. A NodeB for an HSPA enabled WCDMA system, the NodeB being arranged to receive from a UE a first and a second pilot signal transmitted from the UE with respective first and second sets of pre-coding weights, as well as to receive from the UE a first data stream which has been transmitted from the UE with said first set of pre-coding weights but with a different spreading code than the first pilot signal, the NodeB being arranged to transmit instructions to the UE on at least one of the first and second sets of pre-coding weights, and to use said first and second pilot signals in order to determine said instructions, and wherein an output power of the second pilot signal is offset relative to an output power of the first pilot signal, wherein the NodeB is further arranged to send a value of the offset from said UE via radio resource signaling, wherein the pilot symbols of a WCDMA DPCCH channel are used as the first pilot signal, wherein the pilot symbols of another WCDMA channel are used as the second pilot signal, wherein the pilot symbols of the other WCDMA channel use a same slot format as the pilot symbols of the WCDMA DPCCH channel, and wherein different spreading codes are used for the WCDMA DPCCH channel and the other WCDMA channel.
- 14. A method for operating a User Equipment, a UE, for an HSPA enabled WCDMA system, the UE being equipped with at least a first and a second transmit antenna, the method comprising receiving instructions from a NodeB on one or more sets of pre-coding weights to be used in transmissions from the UE, the method comprising using each pre-coding weight in said one or more sets for multiplication with information which is transmitted from one of the UE'"'"'s antennas, the method further comprising transmitting a first and a second pilot signal, and using a first of said sets of pre-coding weights for the first pilot signal and a second of said sets of pre-coding weights for the second pilot signal, and also using the first set of pre-coding weights for transmitting a first data stream, the method further comprising using different spreading codes for the first data stream and for the first pilot signal, and wherein an output power of the second pilot signal is offset relative to an output power of the first pilot signal, wherein the UE receives a value of the offset from said NodeB via radio resource signaling, wherein the UE uses the pilot symbols of a WCDMA DPCCH channel as the first pilot signal, wherein the uses as the second pilot signal the pilot symbols of another WCDMA channel, wherein the pilot symbols of the other WCDMA channel use a same slot format as the pilot symbols of the WCDMA DPCCH channel, and wherein the UE uses different spreading codes for the WCDMA DPCCH channel and said other WCDMA channel.
- 18. A method for operating a NodeB for an HSPA enabled WCDMA system, the method comprising receiving from a UE a first and a second pilot signal transmitted from the UE with respective first and second sets of pre-coding weights, as well as receiving from the UE a first data stream which has been transmitted from the UE with said first set of pre-coding weights but with a different spreading code than the first pilot signal, the method comprising transmitting instructions to the UE on at least one of the first and second sets of pre-coding weights, and using said first and second pilot signals in order to determine said instructions to the UE, and wherein an output power of the second pilot signal is offset relative to an output power of the first pilot signal, wherein the NodeB sends a value of the offset from said UE via radio resource signaling, wherein the pilot symbols of a WCDMA DPCCH channel are used as the first pilot signal, wherein the pilot symbols of another WCDMA channel are used as the second pilot signal, wherein the pilot symbols of the other WCDMA channel use a same slot format as the pilot symbols of the WCDMA DPCCH channel, and wherein different spreading codes are used for the WCDMA DPCCH channel and the other WCDMA channel.
Specification