Terminal device, base station device, communication method, and integrated circuit
A terminal device and a base station device can efficiently communicate with each other by using a downlink channel. The terminal device monitors, in a subframe k, a first set S k (L) of first PDCCH candidates and a second set S k (L) of second PDCCH candidates. A first number M c (L) of first PDCCH candidates is given based on first α c and M (L) , and a second number M c (L) of second PDCCH candidates is given based on second α c and M (L) . First CCE(s) corresponding to an m-th first PDCCH candidate included in the first set S k (L) and a second CCE(s) corresponding to an m-th second PDCCH candidate included in the second set are given by an expression below. N CCE,k is a total number of CCEs in the subframe k, and L is an aggregation level.
1. A terminal device comprising:
antenna circuitry configured to receive a Physical Downlink Control Channel (PDCCH); and
reception circuitry configured to monitor, in a subframe k, a first set S k1 (L) of first PDCCH candidates and a second set S k2 (L) of second PDCCH candidates, wherein
the first set S k1 (L) corresponds to a first Carrier Indicator Field (CIF) value n CI and a first aggregation level L,
the second set S k2 (L) corresponds to a second CIF value n CI and the first aggregation level L,
a first number M c1 (L) of the first PDCCH candidates is given based on at least a first coefficient α c1 indicated by first information and a value M (L) , the value M (L) is a predetermined value corresponding to the first aggregation level L,
a second number M c2 (L) of the second PDCCH candidates is given based on at least a second coefficient α c2 indicated by second information and the value M (L) , and
first Control Channel Element(s) (CCE(s)) corresponding to an m-th first PDCCH candidate of the first PDCCH candidates included in the first set S k1 (L) and second CCE(s) corresponding to an m-th second PDCCH candidate of the second PDCCH candidates included in the second set S k2 (L) are given by expressions below:
L {( Y k +m ′)mod floor( N CCE,k /L )}+ i
where i=0, 1, . . . , L−1
m′=m+M (L) ·n CI
where m=0, 1, . . . , M c (L) −1
where M c (L) is i) M c1 (L) in a case that the first coefficient α c1 is indicated by the first information or ii) M c2 (L) in a case that the second coefficient α c2 is indicated by the second information, and
Y k =( A·Y k-1 )mod D
where
Y −1 =n RNTI ≠0, A=39827, D=65537, k=floor(n s /2)
where N CCE,k is a total number of CCEs including at least the first CCE in the subframe k and the second CCE in the subframe k,
floor is a function for returning a value obtained by truncating an input value below a decimal point, and
A mod B is a function for returning a remainder obtained by dividing A by B.
2. A base station device comprising:
transmission circuitry configured to code Downlink Control Information to be transmitted using a Physical Downlink Control Channel (PDCCH); and
antenna circuitry configured to transmit the PDCCH in each of a first set S k1 (L) of first PDCCH candidates and a second set S k2 (L) of second PDCCH candidates in a subframe k, wherein
the first set S k1 (L) corresponds to a first Carrier Indicator Field (CIF) value n CI and a first aggregation level L,
the second set S k2 (L) corresponds to a second CIF value n CI and the first aggregation level L,
a first number M c1 (L) of the first PDCCH candidates is given based on at least a first coefficient α c1 indicated by first information and a value M (L) , the value M (L) is a predetermined value corresponding to the first aggregation level L,
a second number M c2 of the second PDCCH candidates is given based on at least second coefficient α c2 indicated by second information and the value M (L) , and
first Control Channel Element(s) (CCE(s)) corresponding to an m-th first PDCCH candidate of the first PDCCH candidates included in the first set S k1 (L) and second CCE(s) corresponding to an m-th second PDCCH candidate of the second PDCCH candidates included in the second set S k2 (L) are given by expressions below:
L {( Y k +m ′)mod floor( N CCE,k /L )}+ i
where i=0, 1, . . . , L−1
m′=m+M (L) ·n CI
where m=0, 1, . . . , M c (L) −1
where M c (L) is i) M c1 (L) in a case that the first coefficient α c1 is indicated by the first information or ii) M c2 (L) in a case that the second coefficient α c2 is indicated by the second information, and
Y k =( A·Y k-1 )mod D
where
Y −1 =n RNTI ≠0, A=39827, D=65537, k=floor(n s /2)
where N CCE,k is a total number of CCEs including at least the first CCE in the subframe k and the second CCE in the subframe k,
floor is a function for returning a value obtained by truncating an input value below a decimal point, and
A mod B is a function for returning a remainder obtained by dividing A by B.
3. A communication method to be used for a terminal device, the communication method comprising:
receiving a Physical Downlink Control Channel (PDCCH); and
monitoring, in a subframe k, a first set S k1 (L) of first PDCCH candidates and a second set S k2 (L) of second PDCCH candidates, wherein
the first set S k1 (L) corresponds to a first Carrier Indicator Field (CIF) value n CI and a first aggregation level L,
the second set S k2 (L) corresponds to a second CIF value n CI and the first aggregation level L,
a first number M c1 (L) of the first PDCCH candidates is given based on at least a first coefficient α c1 indicated by first information and a value M (L) , the value M (L) is a predetermined value corresponding to the first aggregation level L,
a second number M c1 (L) of the second PDCCH candidates is given based on at least a second coefficient α c2 indicated by second information and the value M (L) , and
first Control Channel Element(s) (CCE(s)) corresponding to an m-th first PDCCH candidate of the first PDCCH candidates included in the first set S k1 (L) and second CCE(s) corresponding to an m-th second PDCCH candidate of the second PDCCH candidates included in the second set S k2 (L) are given by expressions below:
L {( Y k +m ′)mod floor( N CCE,k /L )}+ i
where i=0, 1, . . . , L−1
m′=m+M (L) ·n CI
where m=0, 1, . . . , M c (L) −1, where M c (L) is i) M c1 (L) in a case that the first coefficient α c2 is indicated by the first information or ii) M c2 (L) in a case that the second coefficient α c2 is indicated by the second information, and
Y k =( A·Y k-1 )mod D
where
Y −1 =n RNTI ≠0, A=39827, D=65537, k=floor(n s /2)
where N CCE,k is a total number of CCEs including at least the first CCE in the subframe k and the second CCE in the subframe k,
floor is a function for returning a value obtained by truncating an input value below a decimal point, and
A mod B is a function for returning a remainder obtained by dividing A by B.
4. A communication method to be used for a base station device, the communication method comprising:
coding Downlink Control Information transmitted using a Physical Downlink Control Channel (PDCCH); and
transmitting the PDCCH in each of a first set S k1 (L) of first PDCCH candidates and a second set S k2 (L) of second PDCCH candidates in a subframe k, wherein
the first set S k1 (L) corresponds to a first Carrier Indicator Field (CIF) value n CI and a first aggregation level L,
the second set S k2 (L) corresponds to a second CIF value n CI and the first aggregation level L,
a first number M c1 (L) of the first PDCCH candidates is given based on at least a first coefficient α c1 indicated by first information and a value M (L) , the value M (L) is a predetermined value corresponding to the first aggregation level L,
a second number M c2 (L) of the second PDCCH candidates is given based on at least a second coefficient α c2 indicated by second information and the value M (L) , and
first Control Channel Element(s) (CCE(s)) corresponding to an m-th first PDCCH candidate of the first PDCCH candidates included in the first set S k1 (L) and second CCE(s) corresponding to an m-th second PDCCH candidate of the second PDCCH candidates included in the second set S k2 (L) are given by expressions below:
L {( Y k +m ′)mod floor( N CCE,k /L )}+ i
where i=0, 1, . . . , L−1
m′=m+M (L) ·n CI
where m=0, 1, . . . , M c (L) −1, where M c (L) is i) M C1 (L) in a case that the first coefficient α C1 is indicated by the first information or ii) M c2 (L) in a case that the second coefficient α c2 is indicated by the second information, and
Y k =( A·Y k-1 )mod D
where
Y −1 =n RNTI ≠0, A=39827, D=65537, k=floor(n s /2)
where N CCE,k is a total number of CCEs including at least the first CCE in the subframe k and the second CCE in the subframe k,
floor is a function for returning a value obtained by truncating an input value below a decimal point, and
A mod B is a function for returning a remainder obtained by dividing A by B.