MANAGING CROSS-CARRIER SCHEDULING IN CARRIER AGGREGATION WITH EPDCCH IN LTE
A method, an apparatus, and a computer program product for wireless communication are provided for cross-carrier scheduling when both PDCCH and EPDCCH are employed in a network that supports carrier aggregation. The apparatus receives a first component carrier and a second component carrier, where the first component carrier includes a first control channel, a second control channel, and carrier indication information. The first control channel corresponds to the first component carrier. The second control channel and the carrier indication information correspond to the second component carrier. The second control channel is one of at least a first type (e.g., PDCCH) or second type (e.g., EPDCCH) of control channel and the carrier indication information identifies the second component carrier for both the first and second types of control channels. The apparatus then processes the first and second control channels.
1 . A method of wireless communication, comprising:
configuring a first component carrier to include:
a first control channel configured to schedule resources for at least one of the first component carrier or a second component carrier, wherein the first control channel is a first type of control channel, or
a second control channel configured to schedule resources for at least one of the first component carrier or the second component carrier, wherein the second control channel is a second type of control channel, and
a carrier indication information having a value and included in the first type of control channel or the second type of control channel, wherein when the value comprises a first value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the first component carrier, and when the value comprises a second value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the second component carrier; and
transmitting the first component carrier and the second component carrier.
2 . The method of claim 1 , wherein the first type of control channel is a legacy physical downlink control channel (PDCCH) and the second type of control channel is an enhanced physical downlink control channel (EPDCCH).
3 . The method of claim 1 , wherein the first component carrier is configured as a primary component carrier and the second component carrier is configured as a secondary component carrier.
4 . The method of claim 1 , wherein the first component carrier, which comprises the first control channel or the second control channel and that comprises the carrier indication information, is configured as a first secondary component carrier and the second component carrier is configured as a second secondary component carrier.
5 . The method of claim 1 , wherein the first control channel and the second control channel are an enhanced physical downlink control channel (EPDCCH), and
the method further comprises configuring a common set of resources for the first control channel and the second control channel.
6 . The method of claim 5 , further comprising configuring a first search space for the first control channel and a second search space for the second control channel, the first search space and the second search space sharing the common set of resources.
7 . The method of claim 6 , wherein the second search space is offset from the first search space.
8 . The method of claim 1 , wherein the first control channel comprises the carrier indication information corresponding to the first component carrier.
9 . The method of claim 1 , wherein the value of the carrier indication information corresponding to the second component carrier is included in the second control channel based on a radio-resource-control (RRC) configuration.
10 . The method of claim 1 , further comprising:
transmitting a control signaling indicating that the carrier indication information is enabled, wherein the control signaling indicating that the carrier indication information is enabled comprises a common control signal for both the first type of control channel and the second type of control channel, the common control signal indicating that the carrier indication information is enabled for both the first type of control channel and the second type of control channel.
11 . The method of claim 1 , further comprising configuring a UE-specific search space for the second control channel.
12 . An apparatus for wireless communication, comprising:
means for configuring a first component carrier to include:
a first control channel configured to schedule resources for at least one of the first component carrier or a second component carrier, wherein the first control channel is a first type of control channel, or
a second control channel configured to schedule resources for at least one of the first component carrier or the second component carrier, wherein the second control channel is a second type of control channel, and
a carrier indication information having a value and included in the first type of control channel or the second type of control channel, wherein when the value comprises a first value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the first component carrier, and when the value comprises a second value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the second component carrier; and
means for transmitting the first component carrier and the second component carrier.
13 . The apparatus of claim 12 , wherein the first type of control channel is a legacy physical downlink control channel (PDCCH) and the second type of control channel is an enhanced physical downlink control channel (EPDCCH).
14 . The apparatus of claim 12 , wherein the first component carrier is configured as a primary component carrier and the second component carrier is configured as a secondary component carrier.
15 . The apparatus of claim 12 , wherein the first component carrier, which comprises the first control channel or the second control channel and that comprises the carrier indication information, is configured as a first secondary component carrier and the second component carrier is configured as a second secondary component carrier.
16 . The apparatus of claim 12 , wherein the first control channel and the second control channel are an enhanced physical downlink control channel (EPDCCH), and
the apparatus further comprises means for configuring a common set of resources for the first control channel and the second control channel.
17 . The apparatus of claim 16 , further comprising:
means for configuring a first search space for the first control channel and a second search space for the second control channel, the first search space and the second search space sharing the common set of resources.
18 . The apparatus of claim 12 , further comprising:
means for transmitting a control signaling indicating that the carrier indication information is enabled, wherein the control signaling indicating that the carrier indication information is enabled comprises a common control signal for both the first type of control channel and the second type of control channel, the common control signal indicating that the carrier indication information is enabled for both the first type of control channel and the second type of control channel.
19 . An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
configure a first component carrier to include:
a first control channel configured to schedule resources for at least one of the first component carrier or a second component carrier, wherein the first control channel is a first type of control channel, or
a second control channel configured to schedule resources for at least one of the first component carrier or the second component carrier, wherein the second control channel is a second type of control channel, and
a carrier indication information having a value and included in the first type of control channel or the second type of control channel, wherein when the value comprises a first value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the first component carrier, and when the value comprises a second value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the second component carrier; and
transmit the first component carrier and the second component carrier.
20 . The apparatus of claim 19 , wherein the first type of control channel is a legacy physical downlink control channel (PDCCH) and the second type of control channel is an enhanced physical downlink control channel (EPDCCH).
21 . The apparatus of claim 19 , wherein the first component carrier is configured as a primary component carrier and the second component carrier is configured as a secondary component carrier.
22 . The apparatus of claim 19 , wherein the first component carrier, which comprises the first control channel or the second control channel and that comprises the carrier indication information, is configured as a first secondary component carrier and the second component carrier is configured as a second secondary component carrier.
23 . The apparatus of claim 19 , wherein the first control channel and the second control channel are an enhanced physical downlink control channel (EPDCCH), and
wherein the at least one processor is further configured to configure a common set of resources for the first control channel and the second control channel.
24 . The apparatus of claim 23 , wherein the at least one processor is further configured to configure a first search space for the first control channel and a second search space for the second control channel, the first search space and the second search space sharing the common set of resources.
25 . The apparatus of claim 24 , wherein the second search space is offset from the first search space.
26 . The apparatus of claim 19 , wherein the first control channel comprises the carrier indication information corresponding to the first component carrier.
27 . The apparatus of claim 19 , wherein the value of the carrier indication information corresponding to the second component carrier is included in the second control channel based on a radio-resource-control (RRC) configuration.
28 . The apparatus of claim 19 , wherein the second control channel is of the first type of control channel in a first subframe and is of the second type of control channel in a second subframe, and the second subframe is different from the first subframe.
29 . The apparatus of claim 19 , wherein the at least one processor is further configured to transmit a control signaling indicating that the carrier indication information is enabled, wherein the control signaling indicating that the carrier indication information is enabled comprises a common control signal for both the first type of control channel and the second type of control channel, the common control signal indicating that the carrier indication information is enabled for both the first type of control channel and the second type of control channel.
30 . A computer program product, comprising:
a computer-readable medium comprising code for:
configuring a first component carrier to include:
a first control channel configured to schedule resources for at least one of the first component carrier or a second component carrier, wherein the first control channel is a first type of control channel, or
a second control channel configured to schedule resources for at least one of the first component carrier or the second component carrier, wherein the second control channel is a second type of control channel, and
a carrier indication information having a value and included in the first type of control channel or the second type of control channel, wherein when the value comprises a first value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the first component carrier, and when the value comprises a second value, the carrier indication information identifies that the first type of control channel or the second type of control channel schedules the resources on the second component carrier; and
transmitting the first component carrier and the second component carrier.