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METHOD AND APPARATUS OF USING CDD LIKE SCHEMES WITH UE-RS BASED OPEN LOOP BEAMFORMING

2015
Online Patent
Zugriff:
View record in USPTO Patent Applications (Volltext)

A method and apparatus of wireless communication are disclosed. The wireless communication performs pilot signal transmissions using a first precoding matrix for user equipment specific pilot signals, the pilot signal transmissions having a first transmission rank. The wireless communication also performs data transmissions using a second precoding matrix for data when the data transmissions have a second transmission rank less than the first transmission rank, in which the second precoding matrix includes a transformed version of the first precoding matrix. Alternatively, the wireless communication can perform data transmissions using at least two precoding matrices for data when the data transmissions have a second transmission rank less than or equal to the first transmission rank. Accordingly, the precoding matrix used for data is a transformed version of the precoding matrix used for user equipment specific pilot signals.

Titel:
METHOD AND APPARATUS OF USING CDD LIKE SCHEMES WITH UE-RS BASED OPEN LOOP BEAMFORMING
Link:
Veröffentlichung: 2015
Medientyp: Patent
Sonstiges:
  • Nachgewiesen in: USPTO Patent Applications
  • Sprachen: English
  • Document Number: 20150085948
  • Publication Date: March 26, 2015
  • Appl. No: 14/565124
  • Application Filed: December 09, 2014
  • Claim: 1. A method of selectively providing cyclic delay diversity transmissions using user equipment reference signals, the method comprising: determining an operational state of a channel between a base station and a user equipment; and signaling, based on the determined operational state, a transmission mode to the user equipment, wherein at least one transmission scheme includes user equipment specific pilot transmissions in a resource block using a first precoding matrix and data transmissions in the resource block using one or more of a transformed version of the first precoding matrix.
  • Claim: 2. The method of claim 1, wherein the determining the operational state includes determining a Doppler speed of the user equipment.
  • Claim: 3. The method of claim 1, wherein the pilot transmissions have a first transmission rank and the data transmissions have a second transmission rank.
  • Claim: 4. The method of claim 3, wherein the data transmissions use at least two precoding matrices when the second transmission rank is equal to the first transmission rank.
  • Claim: 5. The method of claim 1, wherein the pilot transmissions use a first precoding matrix for user equipment specific pilot signals.
  • Claim: 6. The method of claim 3, further including determining the first transmission rank and the second transmission rank based on user equipment feedback or uplink measurements.
  • Claim: 7. The method of claim 3, further including providing the first transmission rank and the second transmission rank to the user equipment.
  • Claim: 8. An apparatus for selectively providing cyclic delay diversity (CDD) transmissions using user equipment reference signals (UE-RS), comprising: means for determining an operational state of a channel between a base station and a user equipment (UE); and means for signaling, based on the determined operational state, a transmission mode to the user equipment wherein at least one transmission scheme includes user equipment specific pilot transmissions in a resource block using a first precoding matrix and data transmissions in the resource block using one or more of a transformed version of the first precoding matrix.
  • Claim: 9. The apparatus of claim 8, wherein the means for determining the operational state includes means for determining a Doppler speed of the user equipment.
  • Claim: 10. The apparatus of claim 8, wherein the pilot transmissions have a first transmission rank and the data transmissions have a second transmission rank.
  • Claim: 11. The apparatus of claim 10, wherein the data transmissions use at least two precoding matrices when the second transmission rank is equal to the first transmission rank.
  • Claim: 12. The apparatus of claim 8, wherein the pilot transmissions use a first precoding matrix for user equipment specific pilot signals.
  • Claim: 13. The apparatus of claim 10, further including means for determining the first transmission rank and the second transmission rank based on user equipment feedback or uplink measurements.
  • Claim: 14. The apparatus of claim 10, further including means for providing the first transmission rank and the second transmission rank to the user equipment.
  • Claim: 15. A wireless communication apparatus, comprising: a memory for storing instructions to: determine an operational state of a channel between a base station and a user equipment; and signal, based on the determined operational state, a transmission mode to the user equipment wherein at least one transmission scheme includes user equipment specific pilot transmissions in a resource block using a first precoding matrix and data transmissions in the resource block using one or more of a transformed version of the first precoding matrix; and a processor for executing the instructions.
  • Claim: 16. The apparatus of claim 15, wherein the instructions to determine the operational state include instructions to determine a Doppler speed of the user equipment.
  • Claim: 17. The apparatus of claim 15, wherein the pilot transmissions have a first transmission rank and the data transmissions have a second transmission rank.
  • Claim: 18. The apparatus of claim 17, wherein the data transmissions use at least two precoding matrices when the second transmission rank is equal to the first transmission rank.
  • Claim: 19. The apparatus of claim 15, wherein the pilot transmissions use a first precoding matrix for user equipment specific pilot signals.
  • Claim: 20. The apparatus of claim 17, further including instructions to determine the first transmission rank and the second transmission rank based on user equipment feedback or uplink measurements.
  • Claim: 21. The apparatus of claim 17, further including instructions to provide the first transmission rank and the second transmission rank to the user equipment.
  • Claim: 22. A computer program product comprising a non-transitory tangible computer readable medium storing instructions, the instructions comprising: code for determining an operational state of a channel between a base station and a user equipment; and code for signaling, based on the determined operational state, a transmission mode to the user equipment wherein at least one transmission scheme includes user equipment specific pilot transmissions in a resource block using a first precoding matrix and data transmissions in the resource block using one or more of a transformed version of the first precoding matrix.
  • Claim: 23. The apparatus of claim 22, wherein the instructions to determine the operational state include instructions to determine a Doppler speed of the user equipment.
  • Claim: 24. The apparatus of claim 22, wherein the pilot transmissions have a first transmission rank and the data transmissions have a second transmission rank.
  • Claim: 25. The apparatus of claim 24, wherein the data transmissions use at least two precoding matrices when the second transmission rank is equal to the first transmission rank.
  • Claim: 26. The apparatus of claim 22, wherein the pilot transmissions use a first precoding matrix for user equipment specific pilot signals.
  • Claim: 27. The apparatus of claim 24, further including instructions to determine the first transmission rank and the second transmission rank based on user equipment feedback or uplink measurements.
  • Claim: 28. The apparatus of claim 24, further including instructions to provide the first transmission rank and the second transmission rank to the user equipment.
  • Current U.S. Class: 375/267
  • Current International Class: 04; 04

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