Channel state information-reference signal patterns for time division duplex systems in long term evolution wireless networks
First Claim
1. A user equipment (UE) for time division duplex (TDD) communication through a wireless communication channel with an evolved Node B (eNB), the TDD communication having a radio frame including an uplink subframe and a special subframe preceding the uplink subframe, the UE comprising:
- a receiver configured to receive from the eNB, a channel state information reference signal (CSI-RS) subframe configuration value, a CSI-RS configuration value, and a CSI-RS; and
circuitry configured to;
determine, based on the CSI-RS subframe configuration value, a subframe index corresponding to a temporal position of a special subframe including the CSI-RS in the radio frame;
determine, based on the CSI-RS configuration value, a CSI-RS pattern of one or more orthogonal frequency division modulation (OFDM) resource elements carrying the CSI-RS, the pattern being from among a group of CSI-RS patterns that include OFDM resource elements in OFDM symbols corresponding to a physical downlink control channel (PDCCH) region of a long term evolution (LTE) wireless communication channel;
control the receiver to receive from the eNB the special subframe carrying the CSI-RS during the temporal position and at the one or more OFDM resource elements of the CSI-RS pattern; and
measure the wireless communication channel based on the CSI-RS, in which the CSI-RS subframe configuration value has a value according to an expression 1+(x*5), where x satisfies the relationship 0≦
x≦
30.
3 Assignments
0 Petitions
Accused Products
Abstract
A user equipment (UE) for time division duplex (TDD) communication through a wireless communication channel has a receiver to receive a channel state information reference signal (CSI-RS) subframe configuration value, a CSI-RS configuration value, and a CSI-RS; and circuitry to determine a subframe index corresponding to a temporal position of a special subframe including the CSI-RS; determine a CSI-RS pattern of one or more orthogonal frequency division modulation (OFDM) resource elements carrying the CSI-RS, the pattern being from among a group of CSI-RS patterns that include OFDM resource elements in OFDM symbols corresponding to a physical downlink control channel (PDCCH) region of a legacy LTE wireless communication channel; control the receiver to receive the special subframe carrying the CSI-RS during the temporal position and at the one or more OFDM resource elements of the CSI-RS pattern; and measure the wireless communication channel based on the CSI-RS.
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Citations
20 Claims
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1. A user equipment (UE) for time division duplex (TDD) communication through a wireless communication channel with an evolved Node B (eNB), the TDD communication having a radio frame including an uplink subframe and a special subframe preceding the uplink subframe, the UE comprising:
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a receiver configured to receive from the eNB, a channel state information reference signal (CSI-RS) subframe configuration value, a CSI-RS configuration value, and a CSI-RS; and circuitry configured to; determine, based on the CSI-RS subframe configuration value, a subframe index corresponding to a temporal position of a special subframe including the CSI-RS in the radio frame; determine, based on the CSI-RS configuration value, a CSI-RS pattern of one or more orthogonal frequency division modulation (OFDM) resource elements carrying the CSI-RS, the pattern being from among a group of CSI-RS patterns that include OFDM resource elements in OFDM symbols corresponding to a physical downlink control channel (PDCCH) region of a long term evolution (LTE) wireless communication channel; control the receiver to receive from the eNB the special subframe carrying the CSI-RS during the temporal position and at the one or more OFDM resource elements of the CSI-RS pattern; and measure the wireless communication channel based on the CSI-RS, in which the CSI-RS subframe configuration value has a value according to an expression 1+(x*5), where x satisfies the relationship 0≦
x≦
30. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe; receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l; determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
; andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols l of the pattern based on the equation that includes the following expression; - View Dependent Claims (14, 15, 16, 17)
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9. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe, receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l; determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
; andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols l of the pattern on the equation that includes the following expression; - View Dependent Claims (18)
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10. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe; receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l; determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
; andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols l of the pattern based on the equation that includes the following expression; - View Dependent Claims (19)
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11. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe; receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l; determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
; andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols of the pattern based on the equation that includes the following expression; - View Dependent Claims (20)
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12. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe; receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l; determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
; andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols l of the pattern based on the equation that includes the following expression;
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13. A method of receiving a channel state information reference signal (CSI-RS), the method comprising:
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receiving from an evolved Node B (eNB) information indicating that the CSI-RS is carried in a special subframe preceding an uplink subframe, receiving from the eNB CSI-RS configuration information indicating a position of the CSI-RS in a pattern of resource elements of an OFDM transmission made in the special subframe, in which the pattern comprises CSI-RS subcarriers k and symbols l, determining, based on the CSI-RS configuration information, the pattern according to an equation and a predetermined table, the predetermined table having pairs of subcarrier position k′ and
symbol position l′
corresponding to a resource element, the pairs including resource elements in at least one of an initial pair of OFDM symbols of a resource block, and the equation identifying the CSI-RS subcarriers k and symbols l based on an antenna port value, an index of resource blocks in the special subframe, and a selected pair of subcarrier position k′ and
a symbol position l′
, andreceiving the CSI-RS at the subcarriers k and symbols l, in which the CSI-RS configuration information comprises an index for the pairs of subcarrier position k′ and
symbol position l′
of the predetermined table, and in which the determining comprises;selecting, based on the index, a pair of subcarrier position k′ and
symbol position l′
from the predetermined table; andmapping the pair of subcarrier position k′ and
symbol position l′
to the CSI-RS subcarriers k and symbols l of the pattern based on the equation that includes the following expression;
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Specification