Method and apparatus for transmission and reception in multi-carrier wireless communication systems
DCFirst Claim
1. A communication apparatus, comprising:
- a memory; and
a processor operably coupled to the memory,wherein the processor, when executing program instructions stored in the memory, is configured to;
cause the communication apparatus to monitor Physical Downlink Control Channel (PDCCH) candidates in Common Search Space (CSS) and User equipment-specific Search Space (USS), wherein the PDCCH candidates include a first PDCCH candidate in the CSS and a second PDCCH candidate in the USS; and
cause the communication apparatus to select the first PDCCH candidate as PDCCH transmitted from an e-Node B (eNB) if the first PDCCH candidate and the second PDCCH candidate satisfy a first set of conditions,wherein the first set of conditions includes;
(1) Cyclic redundancy check (CRC) of the first PDCCH candidate and CRC of the second PDCCH candidate are scrambled by a same Radio Network Temporary Identifier (RNTI),(2) the first PDCCH candidate and the second PDCCH candidate have a same payload size,(3) the first PDCCH candidate and the second PDCCH candidate have a same first Control Channel Element (CCE) index, and(4) the communication apparatus is configured with a carrier indicator field.
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Abstract
Data transmission and reception is provided by configuring control channels in a wireless communication system using a plurality of carriers. User equipment (UE) may monitor physical downlink control channel (PDCCH) candidates within common search spaces (CSSs) and User Equipment-specific search spaces (USSs). If the UE is configured with cross-carrier scheduling, when two PDCCH candidates originating from a CSS and a USS, respectively, have cyclic redundancy check (CRC) scrambled by the same Radio Network Temporary Identifier (RNTI) and have a common payload size and the same first control channel element (CCE) index, the UE may interpret that only the PDCCH originating from the CSS is transmitted, thereby solving ambiguity of downlink control information (DCI) detection.
16 Citations
22 Claims
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1. A communication apparatus, comprising:
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a memory; and a processor operably coupled to the memory, wherein the processor, when executing program instructions stored in the memory, is configured to; cause the communication apparatus to monitor Physical Downlink Control Channel (PDCCH) candidates in Common Search Space (CSS) and User equipment-specific Search Space (USS), wherein the PDCCH candidates include a first PDCCH candidate in the CSS and a second PDCCH candidate in the USS; and cause the communication apparatus to select the first PDCCH candidate as PDCCH transmitted from an e-Node B (eNB) if the first PDCCH candidate and the second PDCCH candidate satisfy a first set of conditions, wherein the first set of conditions includes; (1) Cyclic redundancy check (CRC) of the first PDCCH candidate and CRC of the second PDCCH candidate are scrambled by a same Radio Network Temporary Identifier (RNTI), (2) the first PDCCH candidate and the second PDCCH candidate have a same payload size, (3) the first PDCCH candidate and the second PDCCH candidate have a same first Control Channel Element (CCE) index, and (4) the communication apparatus is configured with a carrier indicator field. - View Dependent Claims (2, 3, 4, 5)
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6. A communication apparatus, comprising:
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a memory; and a processor operably coupled to the memory, wherein the processor, when executing program instructions stored in the memory, is configured to; cause the communication apparatus to generate a plurality of Physical Downlink Control Channels (PDCCHs); and cause the communication apparatus to transmit the plurality of PDCCHs in Common Search Space (CSS) and User Equipment-specific Search Space (USS), wherein; any one of the plurality of PDCCHs transmitted in the CSS and any one of the plurality of PDCCHs transmitted in the USS do not satisfy all of a first set of conditions, and the first set of conditions includes; (1) Cyclic redundancy check (CRC) of the one of the plurality of PDCCHs transmitted in the CSS and CRC of the one of the plurality of PDCCHs transmitted in the USS are scrambled by a same Radio Network Temporary Identifier (RNTI), (2) the one of the plurality of PDCCHs transmitted in the CSS and the one of the plurality of PDCCHs transmitted in the USS have a same payload size, (3) the one of the plurality of PDCCHs transmitted in the CSS and the one of the plurality of PDCCHs transmitted in the USS have a same first Control Channel Element (CCE) index, and (4) the one of the plurality of PDCCHs transmitted in the USS includes a carrier indicator field. - View Dependent Claims (7, 8, 9)
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10. A communication method performed by an eNB, comprising:
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generating, at the eNB, a plurality of Physical Downlink Control Channels (PDCCHs); and transmitting, at the eNB, the plurality of PDCCHs in Common Search Space (CSS) and User Equipment-specific Search Space (USS), wherein; any one of the plurality of PDCCHs transmitted in the CSS and any one of the plurality of PDCCHs transmitted in the USS do not satisfy all of a first set of conditions, and the first set of conditions includes; (1) Cyclic Redundancy Check (CRC) of the one of the plurality of PDCCHs transmitted in the CSS and CRC of the one of the plurality of PDCCHs transmitted in the USS are scrambled by a same Radio Network Temporary Identifier (RNTI), (2) the one of the plurality of PDCCHs transmitted in the CSS and the one of the plurality of PDCCHs transmitted in the USS have a same payload size, (3) the one of the plurality of PDCCHs transmitted in the CSS and the one of the plurality of PDCCHs transmitted in the USS have a same first Control Channel Element (CCE) index, and (4) the one of the plurality of PDCCHs transmitted in the USS includes a carrier indicator field. - View Dependent Claims (11, 12, 13)
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14. A communication method performed by a user equipment (UE), comprising:
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monitoring, at the UE, Physical Downlink Control Channel (PDCCH) candidates in Common Search Space (CSS) and User equipment-specific Search Space (USS), wherein the PDCCH candidates include a first PDCCH candidate in the CSS and a second PDCCH candidate in the USS; and selecting, at the UE, the first PDCCH candidate as PDCCH transmitted from an eNB if the first PDCCH candidate and the second PDCCH candidate satisfy a first set of conditions, wherein the first set of conditions includes; (1) Cyclic redundancy check (CRC) of the first PDCCH candidate and CRC of the second PDCCH candidate are scrambled by a same Radio Network Temporary Identifier (RNTI), (2) the first PDCCH candidate and the second PDCCH candidate have a same payload size, (3) the first PDCCH candidate and the second PDCCH candidate have a same first Control Channel Element (CCE) index, and (4) the UE is configured with a carrier indicator field. - View Dependent Claims (15, 16, 17)
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18. A communication device for a user equipment (UE), the communication device comprising:
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a memory; and a processor operably coupled to the memory, to execute program instructions stored in the memory, wherein the processor, when executing the program instructions, is configured to; cause the UE to monitor Physical Downlink Control Channel (PDCCH) candidates in Common Search Space (CSS) and User equipment-specific Search Space (USS), wherein the PDCCH candidates include a first PDCCH candidate in the CSS and a second PDCCH candidate in the USS; and cause the UE to select the first PDCCH candidate as PDCCH transmitted from an e-Node B (eNB) if the first PDCCH candidate and the second PDCCH candidate satisfy a first set of conditions, wherein the first set of conditions includes; (1) Cyclic redundancy check (CRC) of the first PDCCH candidate and CRC of the second PDCCH candidate are scrambled by a same Radio Network Temporary Identifier (RNTI), (2) the first PDCCH candidate and the second PDCCH candidate have a same payload size, (3) the first PDCCH candidate and the second PDCCH candidate have a same first Control Channel Element (CCE) index, and (4) the UE is configured with a carrier indicator field. - View Dependent Claims (19, 20, 21, 22)
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Specification