Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for operating a secondary station in a network, the method comprising: in the secondary station: a controller performing the acts of: controlling a transceiver to receive transmissions from a first primary station controlling a first cell and to further receive transmissions from at least one second primary station controlling at least one respective second cell; selecting a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell; selecting a second precoding matrix for the second cell from a subset of precoding matrices associated with the second cell, the subset being dependent upon the first precoding matrix in accordance with a precoding scheme; determining a first and second indicator to identify the first and second precoding matrix respectively; and controlling the transceiver to transmit the first and second indicator; wherein an amount of data transmitted to transmit the second indicator is less than an amount of data transmitted to transmit the first indicator.
2. A method of operating a primary station in a network, the method comprising: in the primary station: controlling a first cell and a second cell; controlling a first transceiver system to transmit a signal to a secondary station in the first cell; controlling a second transceiver system to transmit the signal to the secondary station; receiving, from the secondary station, a first indicator of a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell; identifying a subset of a second set of precoding matrices associated with the second cell, the subset consisting of at least one precoding matrix associated with the second cell, the subset depending on the first precoding matrix and being in accordance with a precoding scheme; receiving, from the secondary station, a second indicator of a second precoding matrix for the second cell from the subset of precoding matrices associated with the second cell, wherein an amount of data received to determine the second indicator is less than an amount of data received to determine the first indicator; identifying the first and second precoding matrix based on the first and second indicators, respectively; and controlling the first and second transceiver systems to transmit the signal to the secondary station using the first and second precoding matrices, respectively.
3. A secondary station comprising: a transceiver; and the secondary station being configured to: control the transceiver to receive transmissions from a first primary station controlling a first cell and to receive transmissions from at least one second primary station controlling at least one respective second cell, and at least at times receiving the transmissions of the first and second primary stations concurrently; select a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell; select a second precoding matrix for the second cell from a subset of precoding matrices for the second cell, the subset depending on the first precoding matrix and being in accordance with a precoding scheme; determine a first and second indicator representative of the first and second precoding matrix respectively; and control the transceiver to transmit the first and second indicators wherein an amount of data transmitted to represent the second indicator is less than an amount of data transmitted to represent the first indicator.
4. The secondary station of claim 3 , comprising a plurality of antennas connected to the transceiver, and the secondary station at times in a beamforming mode controls the transceiver to apply a set of complex coefficients based on the first precoding matrix to a signal transmitted by the plurality of antennas to spatially direct the transmission toward the first primary station.
5. A primary station comprising: a first transceiver system that controls a first cell; a second transceiver system that controls a second cell; and a controller that: receives, from a secondary system in the first cell, a first indicator of a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell, and a second indicator of a second precoding matrix for the second cell from a subset of precoding matrices associated with the second cell, the subset depending on the first precoding matrix and being in accordance with a precoding scheme; and controls the first and second transceiver systems to transmit a signal to the secondary system using the first and second precoding matrices, respectively; wherein an amount of data received to represent the second indicator is less than an amount of data received to represent the first indicator.
6. The primary station of claim 5 , comprising a first plurality of antennas connected to the first transceiver system and a second plurality of antennas connected to the second transceiver system, and wherein the first and second precoding matrix respectively comprise a first and second set of complex coefficients and at times the primary station in a beamforming transmission mode controls the first and second transceiver systems to respectively apply the first and second set of complex coefficients to the signal transmitted by the first and second plurality of antennas to spatially direct the transmission toward the secondary station.
7. A secondary station comprising: a transceiver; and the secondary station being configured to: control the transceiver to receive transmissions from a first and a second primary stations; select a first precoding matrix from a codebook containing at least one first set of precoding matrices; assess a second set of precoding matrices from the codebook, wherein the codebook provides an association between the first set of precoding matrices to corresponding ones of the second sets of precoding matrices, the second set of precoding matrices being associated with the first precoding matrix; select a second precoding matrix from the second set of precoding matrices, the selection of the second precoding matrix depending on the assessment of the second set of precoding matrices; determine a first and second indicator to identify the first and second precoding matrix respectively; and control the transceiver to transmit the first indicator to the first primary station and the second indicator to the second primary station wherein an amount of data transmitted to transmit the first indictor is greater than an amount of data transmitted to transmit the second indicator.
8. A tangible computer readable storage medium that is not a transitory propagating signal or wave, encoded with instructions for controlling a secondary station for performing a method for operating the secondary station in a network, the method comprising: a controller of the secondary station performing the acts of: controlling a transceiver to receive transmissions from a first primary station controlling a first cell while at times concurrently receiving transmissions from at least one second primary station controlling at least one respective second cell; selecting a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell; selecting a second precoding matrix for the second cell from a subset of precoding matrices associated with the second cell, the subset being dependent upon the first precoding matrix in accordance with a precoding scheme; determining a first and second indicator identifying the first and second precoding matrix respectively; and controlling the transceiver to transmit the first and second indicator; wherein an amount of data transmitted to transmit the second indicator is less than an amount of data transmitted to transmit the first indicator.
9. A computer readable storage medium that is not a transitory propagating signal or wave, encoded with control data including instructions for controlling a primary station for performing a method of operating the primary station in a network, the method comprising: a controller of the primary station performing the acts of: controlling a first cell and a second cell; receiving, from the secondary station, a first indicator of a first precoding matrix for the first cell from a first set of precoding matrices associated with the first cell and a second indicator of a second precoding matrix for the second cell from a subset of precoding matrices associated with the second cell, the subset being dependent upon the first precoding matrix in accordance with a precoding scheme; and controlling first and second transceivers to transmit a signal to the secondary station using the first and second precoding matrices, respectively; wherein an amount of data received to represent the second indicator is less than an amount of data received to represent the first indicator.
10. The primary station of claim 5 , wherein a controller of the primary station performs the acts of: the controlling of the first and second cell; the controlling of the first and transceivers for transmitting transmissions to the secondary station; the selecting of the first precoding matrix from the first set of precoding matrices; selecting of the subset of the second set of precoding matrices; the selecting of the second precoding matrix from the subset; and the receiving of the first and second indicator.
11. The secondary station of claim 3 wherein the precoding matrices of the first and second set of precoding matrices are arranged in at least one CoMP (Co-operative Multi-Point transmission) codebook and the precoding matrices in the codebook are arranged in a sequential order according to an angle of the precoding matrices and the sequential order of arrangement in the codebook of the precoding matrices is used as an index value for an indicator for identifying each matrix.
12. The secondary station of claim 3 wherein the subset of the second set of precoding matrices is one of a plurality of subsets of the second set of precoding matrices, and each subset of the plurality of subsets of the second set of precoding matrices is associated with each precoding matrix of the first set of precoding matrices.
13. The secondary station of claim 3 , wherein at least one of the first or second indicator is transmitted to at least one of the first or second primary station.
14. The secondary station of claim 3 , wherein the first primary station controls a serving cell comprising at least the secondary station and the second primary station controls a neighboring cell comprising one or more other secondary stations.
15. The secondary station of claim 3 , wherein the precoding scheme is selected from a set of precoding schemes depending on a topology of the first and second cells.
16. The secondary station of claim 15 , wherein the precoding scheme is selected depending on whether the first and second cells are controlled by a single primary station.
17. The secondary station of claim 3 , wherein the subset of precoding matrices comprises a precoding matrix identical to the first precoding matrix.
18. The secondary station of claim 3 , wherein each precoding matrix of the subset of precoding matrices is indicated by a value obtained by subtracting the indicator representative of the first precoding matrix from a corresponding constant value.
19. The secondary station of claim 3 , wherein the precoding scheme is generated by the secondary station based on performance statistics for combinations of a precoding matrix selected for the first cell and a precoding matrix selected for the second cell.
20. The secondary station of claim 3 , wherein the second indicator is representative of at least one of: a cyclic shift to be applied to a third precoding matrix to obtain the second precoding matrix; a phase rotation to be applied to a third precoding matrix to obtain the second precoding matrix; a parameter of a function for computing a phase rotation to be applied to precoding coefficients of a given antenna from an antenna number to obtain the second precoding matrix from a third precoding matrix; or a combination of antennas for which the phase of the precoding coefficients is rotated to obtain the second precoding matrix from a third precoding matrix.
21. The secondary station of claim 20 , wherein the third precoding matrix is one of: the first precoding matrix or a matrix determined according to the first precoding matrix.
22. The secondary station of claim 3 , wherein transmissions from the first cell and the second cell are rank- 1 transmissions and wherein precoding matrices are precoding vectors.
23. The secondary station of claim 3 , wherein the first primary station and the second primary station are components of a single primary station.
24. The secondary station of claim 3 , comprising the transceiver receiving the first set of precoding matrices and the second set of precoding matrices.
25. The secondary station of claim 3 , wherein the first set of precoding matrices and the second set of precoding matrices are pre-stored in the secondary station.
26. The secondary station of claim 3 , comprising transmitting a rank of the number of antennas to be used.
27. The secondary station of claim 3 , wherein the first selected matrix and the second selected matrix are selected to provide the highest average data rate of the matrices of the respective first set of matrices and subset of matrices.
28. The secondary station of claim 25 , wherein the matrices are related and wherein the first indicator identifies the first precoding matrix and the second indicator indicates the relationship between the first and second precoding matrix.
29. The secondary station of claim 3 , wherein the precoding matrices of the first and second set of precoding matrices are each assigned a unique index value and the first indicator is a first index value assigned to the first selected precoding matrix and the second indicator is an offset value from the first index value.
30. The secondary station of claim 3 , wherein at times the secondary station in a beamforming transmission mode applies a set of complex coefficients based on at least one of the first and second precoding matrix to a signal transmitted by a plurality of antennas of the secondary station to spatially direct the transmission toward a primary station.
31. The secondary station of claim 3 , wherein a controller of the secondary station performs the acts of: controlling of the transceiver to at times simultaneously receive transmissions from the first primary station and the at least one second primary station; the selecting of the first precoding matrix from the first set of precoding matrices; selecting of the subset of the second set of precoding matrices; the selecting of the second precoding matrix from the subset; the determining the first and second indicator; and the controlling of the transceiver to transmit the first and second indicator.
32. The primary station of claim 5 , wherein at least one of the first or second indicator is transmitted to the secondary station.
33. The primary station of claim 5 , wherein the precoding scheme is based on performance statistics for combinations of a precoding matrix selected for the first cell and a precoding matrix selected for the second cell.
34. The primary station of claim 5 , wherein the first and second precoding matrix respectfully comprise a first and second set of complex coefficients used in a beamforming mode to spatially direct the transmission toward the secondary station.
Unknown
February 23, 2016
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