Multi-cell signals in OFDM wireless networks
Wireless devices may receive channel state information (CSI) measurement resources for a plurality of cells, including cells of a first transmission point and cells of a second transmission point. The wireless device may measure CSI for each cell, and may quantize the measured CSI jointly across the cells. The wireless device may send the jointly quantized CSI to a base station, and the jointly quantized CSI may be used in communications via the first transmission point and the second transmission point.
1. A method for use in a wireless device, the method comprising:
receiving, via a first cell of a first transmission point of a base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
transmitting, to the base station, jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
receiving, via the first transmission point of the base station, at least one resource assignment for at least one packet; and
receiving signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.
2. The method of claim 1 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
3. The method of claim 1 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
4. The method of claim 1 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
5. The method of claim 4 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
6. The method of claim 1 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
7. The method of claim 1 , wherein the at least one resource assignment is received from the base station on one serving cell of the plurality of cells.
8. The method of claim 7 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
9. The method of claim 1 , wherein the second transmission point is associated with the base station.
10. The method of claim 1 , wherein the second transmission point is associated with another base station.
11. The method of claim 1 , wherein the first transmission point comprises a second plurality of cells.
12. The method of claim 1 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
13. The method of claim 1 , wherein the first transmission point is geographically separated from the second transmission point.
14. A method for use in a base station, the method comprising:
transmitting, to a wireless device and via a first cell of a first transmission point of the base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
receiving and decoding jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
transmitting, to the wireless device and via the first transmission point, at least one resource assignment for at least one packet; and
transmitting, via the first cell of the first transmission point, first signals to the wireless device, wherein the first signals correspond to the at least one packet, and wherein second signals corresponding to the at least one packet are transmitted via the at least one second cell of the second transmission point.
15. The method of claim 14 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
16. The method of claim 14 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
17. The method of claim 14 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
18. The method of claim 17 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
19. The method of claim 14 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
20. The method of claim 14 , wherein the at least one resource assignment is transmitted by the base station on one serving cell of the plurality of cells.
21. The method of claim 14 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
22. The method of claim 14 wherein the second transmission point is associated with the base station.
23. The method of claim 14 , wherein the second transmission point is associated with another base station.
24. The method of claim 14 , wherein the first transmission point comprises a second plurality of cells.
25. The method of claim 14 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
26. The method of claim 14 , wherein the first transmission point is geographically separated from the second transmission point.
27. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, via a first cell of a first transmission point of a base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
transmit, to the base station, jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
receive, via the first transmission point of the base station, at least one resource assignment for at least one packet; and
receive signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.
28. The wireless device of claim 27 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
29. The wireless device of claim 27 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
30. The wireless device of claim 27 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
31. The wireless device of claim 30 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
32. The wireless device of claim 27 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
33. The wireless device of claim 27 , wherein the at least one resource assignment is received from the base station on one serving cell of the plurality of cells.
34. The wireless device of claim 27 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
35. The wireless device of claim 27 , wherein the second transmission point is associated with the base station.
36. The wireless device of claim 27 , wherein the second transmission point is associated with another base station.
37. The wireless device of claim 27 , wherein the first transmission point comprises a second plurality of cells.
38. The wireless device of claim 27 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
39. The wireless device of claim 27 , wherein the first transmission point is geographically separated from the second transmission point.
40. A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
transmit, to a wireless device and via a first cell of a first transmission point of the base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
receive and decode jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
transmit, to the wireless device and via the first transmission point, at least one resource assignment for at least one packet; and
transmit, via the first cell of the first transmission point, first signals to the wireless device, wherein the signals correspond to the at least one packet, and wherein second signals corresponding to the at least one packet are transmitted via the at least one second cell of the second transmission point.
41. The base station of claim 40 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
42. The base station of claim 40 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
43. The base station of claim 40 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
44. The base station of claim 43 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
45. The base station of claim 40 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
46. The base station of claim 40 , wherein the at least one resource assignment is transmitted by the base station on one serving cell of the plurality of cells.
47. The base station of claim 40 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
48. The base station of claim 40 , wherein the second transmission point is associated with the base station.
49. The base station of claim 40 , wherein the second transmission point is associated with another base station.
50. The base station of claim 40 , wherein the first transmission point comprises a second plurality of cells.
51. The base station of claim 40 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
52. The base station of claim 40 , wherein the first transmission point is geographically separated from the second transmission point.
53. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause a wireless device to:
receive, via a first cell of a first transmission point of a base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
transmit, to the base station, jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
receive, via the first transmission point of the base station, at least one resource assignment for at least one packet; and
receive signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.
54. The non-transitory computer-readable medium of claim 53 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
55. The non-transitory computer-readable medium of claim 53 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
56. The non-transitory computer-readable medium of claim 53 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
57. The non-transitory computer-readable medium of claim 56 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
58. The non-transitory computer-readable medium of claim 53 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
59. The non-transitory computer-readable medium of claim 53 , wherein the at least one resource assignment is received from the base station on one serving cell of the plurality of cells.
60. The non-transitory computer-readable medium of claim 59 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
61. The non-transitory computer-readable medium of claim 53 , wherein the second transmission point is associated with the base station.
62. The non-transitory computer-readable medium of claim 53 , wherein the second transmission point is associated with another base station.
63. The non-transitory computer-readable medium of claim 53 , wherein the first transmission point comprises a second plurality of cells.
64. The non-transitory computer-readable medium of claim 53 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to a wireless device; or
a subset of a CoMP cooperating set.
65. The non-transitory computer-readable medium of claim 53 , wherein the first transmission point is geographically separated from the second transmission point.
66. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause a base station to:
transmit, to a wireless device and via a first cell of a first transmission point of the base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
receive and decode jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
transmit, to the wireless device and via the first transmission point, at least one resource assignment for at least one packet; and
transmit, via the first cell of the first transmission point, first signals to the wireless device, wherein the first signals correspond to the at least one packet, and wherein second signals corresponding to the at least one packet are transmitted via the at least one second cell of the second transmission point.
67. The non-transitory computer-readable medium of claim 66 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
68. The non-transitory computer-readable medium of claim 66 , wherein the at least one message comprises:
a CSI reference signal subframe configuration parameter;
a CSI reference signal antenna port configuration parameter; and
a CSI reference signal radio resource configuration parameter.
69. The non-transitory computer-readable medium of claim 66 , wherein the CSI measurement resources determine sub-band or wideband CSI measurement, wherein the wideband CSI measurement corresponds to CSI measurement on a carrier bandwidth.
70. The non-transitory computer-readable medium of claim 69 , wherein the CSI measurement resources comprise reference signals in the sub-band or the wideband.
71. The non-transitory computer-readable medium of claim 66 , wherein a physical uplink control channel format determines whether at least one of the following measurements are comprised in the CSI:
a channel quality indicator (CQI);
a precoding matrix indicator (PMI);
a precoding type indicator (PTI); or
a rank indicator (RI).
72. The non-transitory computer-readable medium of claim 66 , wherein the at least one resource assignment is transmitted by the base station on one serving cell of the plurality of cells.
73. The non-transitory computer-readable medium of claim 66 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
74. The non-transitory computer-readable medium of claim 66 , wherein the second transmission point is associated with the base station.
75. The non-transitory computer-readable medium of claim 66 , wherein the second transmission point is associated with another base station.
76. The non-transitory computer-readable medium of claim 66 , wherein the first transmission point comprises a second plurality of cells.
77. The non-transitory computer-readable medium of claim 66 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
78. The non-transitory computer-readable medium of claim 66 , wherein the first transmission point is geographically separated from the second transmission point.
79. A system comprising:
a wireless device; and
a base station;
wherein the base station is configured to:
transmit, to the wireless device and via a first cell of a first transmission point of the base station, at least one message indicating channel state information (CSI) measurement resources for each cell of a plurality of cells, wherein the plurality of cells comprises the first cell of the first transmission point and at least one second cell of a second transmission point;
wherein the wireless device is configured to:
receive the at least one message;
transmit, to the base station, jointly quantized CSI that is quantized jointly across the plurality of cells using measured CSI, for the plurality of cells, based on the CSI measurement resources;
receive, via the first transmission point of the base station, at least one resource assignment for at least one packet; and
receive signals simultaneously via the first cell of the first transmission point and the at least one second cell of the second transmission point, wherein the signals correspond to the at least one packet.
80. The system of claim 79 , wherein the jointly quantized CSI comprises a precoding matrix indicator calculated for the plurality of cells.
81. The system of claim 79 , wherein the at least one resource assignment is received from the base station on one serving cell of the plurality of cells.
82. The system of claim 79 , wherein a first CSI measurement resource corresponds to a plurality of resource elements in a plurality of subframes on an antenna port in the plurality of cells.
83. The system of claim 79 , wherein the second transmission point is associated with the base station.
84. The system of claim 79 , wherein the second transmission point is associated with another base station.
85. The system of claim 79 , wherein the first transmission point comprises a second plurality of cells.
86. The system of claim 79 , wherein the first transmission point is at least one of:
a coordinated multi-point (CoMP) transmission point;
a transmission point actively transmitting a physical downlink shared channel (PDSCH) to the wireless device; or
a subset of a CoMP cooperating set.
87. The system of claim 79 , wherein the first transmission point is geographically separated from the second transmission point.