Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method and integrated circuit
When a common search space and a user equipment-specific search space overlap with each other, and bit numbers of DCI formats transmitted in the common search space and the user equipment-specific search space, respectively are the same as each other, a mobile station apparatus identifies a type of the DCI format. When the common search space and the user equipment-specific search space overlap with each other, and a bit number of a DCI format allocated in the common search space and a bit number of a DCI format allocated in the user equipment-specific search space are the same as each other, a base station apparatus does not allocate the DCI format allocated in the user equipment-specific search space in the overlapped space, and a mobile station apparatus performs blind decoding only of the DCI format allocated in the common search space in the overlapped space.
1. A wireless communication system comprising:
a mobile station apparatus; and
a base station apparatus configured to transmit, to the mobile station apparatus, a physical downlink control channel in either a first physical downlink control channel candidate in a common search space or a second physical downlink control channel candidate in a user equipment-specific search space,
the mobile station apparatus configured to monitor the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space,
for the first physical downlink control channel candidate in. the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring the physical downlink control channel,
the base station apparatus being configured to transmit only the physical downlink control channel in the first physical downlink control channel candidate in the common search space, and
the mobile station apparatus being configured to perform monitoring of physical downlink control channel assuming that only the physical downlink control channel in the first physical downlink control channel candidate in the common search space is transmitted.
2. A base station apparatus comprising:
a transmitting unit configured to transmit, to a mobile station apparatus, a physical downlink control channel in either a first physical downlink control channel candidate in a common search space or a second physical downlink control channel candidate in a user equipment-specific search space,
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields,
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring the physical downlink control channel,
the transmitting unit being configured to transmit only the physical downlink control channel in the first physical downlink control channel candidate in the common search space.
3. The base station apparatus according to claim 2 , wherein
the base station apparatus is configured to communicate with the mobile station apparatus using a plurality of component carriers, and
in case that the mobile station apparatus is configured with the carrier indicator field associated with monitoring the physical downlink control channel, the second control information comprises the carrier indicator indicating a component carrier to which the physical downlink control channel corresponds among the plurality of component carriers.
4. The base station apparatus according to claim 2 , wherein
the base station apparatus is configured to communicate with the mobile station apparatus using a plurality of component carriers, and the common search space and the user equipment-specific search space are configured in a same component carrier.
5. A mobile station apparatus comprising:
a receiving unit configured to monitor a first physical downlink control channel candidate in a common search space and a second physical downlink control channel candidate in a user equipment-specific search space,
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields,
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring a physical downlink control channel,
the receiving unit being configured to perform monitoring of physical downlink control channel assuming that only the physical downlink control channel in the first physical downlink control channel candidate in the common search space is transmitted.
6. The mobile station apparatus according to claim 5 , wherein the mobile station apparatus is configured to communicate with the base station apparatus using a plurality of component carriers, and
in case that the mobile station apparatus is configured with the carrier indicator field associated with monitoring the physical downlink control channel, the second control information comprises the carrier indicator indicating a component carrier to which the physical downlink control channel corresponds among the plurality of component carriers.
7. The mobile station apparatus according to claim 5 , wherein
the mobile station apparatus is configured to communicate communicates with the base station apparatus using a plurality of component carriers, and
the common search space and the user equipment-specific search space are configured in a same component carrier.
8. A wireless communication method used for a base station apparatus that is configured to transmit, to a mobile station apparatus, a physical downlink control channel in either a first physical downlink control channel candidate in a common search space or a second physical downlink control channel candidate in a user equipment-specific search space, the wireless communication method comprising:
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields, and
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring the physical downlink control channel, transmitting only the physical downlink control channel in the first physical downlink control channel candidate in the common search space.
9. A wireless communication method used for a mobile station apparatus that is configured to monitor a first physical downlink control channel candidate in a common search space and a second physical downlink control channel candidate in a user equipment-specific, search space, the wireless communication method comprising:
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring a physical downlink control channel.
performing monitoring of Physical downlink control channel assuming that only the physical downlink control channel in the first physical downlink control channel candidate in the common search space is transmitted.
10. An integrated circuit mounted in a base station apparatus, the integrated circuit comprising:
a transmitting circuit configured to transmit, to a mobile station apparatus, a physical downlink control channel in either a first physical downlink control channel candidate in a common search space or a second physical downlink control channel candidate in a user equipment-specific search space, and
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information :in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields,
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring the physical downlink control channel,
the transmitting circuit being configured to transmit only the physical downlink control channel in the first physical downlink control channel candidate in the common search space.
11. An integrated circuit mounted in a mobile station apparatus, the integrated circuit comprising:
a receiving circuit configured to monitor a first physical downlink control channel candidate in a common search space and a second physical downlink control channel candidate in a user equipment-specific search space, and
for the first physical downlink control channel candidate in the common search space and the second physical downlink control channel candidate in the user equipment-specific search space satisfying that
(i) a first control information in the first physical downlink control channel candidate and a second control information in the second physical downlink control channel candidate being with cyclic redundancy check scrambled by C-RNTI (Cell Radio Network Temporary Identifier),
(ii) the first control information and the second control information being with same payload size,
(iii) the first physical downlink control channel candidate and the second physical downlink control channel candidate being comprised of control channel elements with same indices, and
(iv) the first control information and the second control information being with different downlink control information fields,
in case that the mobile station apparatus is configured with a carrier indicator field associated with monitoring a physical downlink control channel,
the receiving circuit being configured to perform monitoring of physical downlink control channel assuming that only the physical downlink control channel in the first physical downlink control channel candidate in the common search space is transmitted.