A terminal device comprising: a receiving unit configured to receive on a physical downlink control channel, PDCCH, from a base station device , a bit sequence <c 0 , ..., c A+L-1 >, and a decoding unit configured to perform a Cyclic Redundancy Check, CRC, for the bit sequence <c 0 , ..., c A+L-1 > in a case that downlink control information on the PDCCH is mapped to User Search Space, USS, and the terminal device is configured to monitor the PDCCH including 24-bit CRC parity bits, wherein the bit sequence <c 0 ,..., c A+L-1 > is given by: c k =b k for k = 0, 1, 2, ..., A + 7, c k = b k + x rnti ,k − A − 8 mod 2 for k = A + 8 , A + 9 , A + 10 , ... , A + 23 , <x rnti,0 , x rnti,1 , ..., x rnti,15 > is a Cell-Radio Network Temporary Identifier, C-RNTI, the b k is given by: b k = a k fork = 0, 1,2, ..., A-1, b k = p k-A for k = A, A + 1, A + 2, ..., A + L - 1, a bit sequence <a 0, ,..., a A-1 > is the downlink control information, A is a payload size of the downlink control information, a bit sequence <p 0 ,..., p L-1 > is parity bits for the CRC, L is a number of the parity bits for the CRC, which is 24, the decoding unit is further configured to detect the downlink control information, and the receiving unit is further configured to perform a reception on a physical downlink shared channel, PDSCH, scheduled by the downlink control information. a receiving unit configured to receive on a physical downlink control channel, PDCCH, from a base station device , a bit sequence <c 0 , ..., c A+L-1 >, and a decoding unit configured to perform a Cyclic Redundancy Check, CRC, for the bit sequence <c 0 , ..., c A+L-1 > in a case that downlink control information on the PDCCH is mapped to User Search Space, USS, and the terminal device is configured to monitor the PDCCH including 24-bit CRC parity bits, wherein the bit sequence <c 0 ,..., c A+L-1 > is given by: c k =b k for k = 0, 1, 2, ..., A + 7, c k = b k + x rnti ,k − A − 8 mod 2 for k = A + 8 , A + 9 , A + 10 , ... , A + 23 , <x rnti,0 , x rnti,1 , ..., x rnti,15 > is a Cell-Radio Network Temporary Identifier, C-RNTI, c k =b k for k = 0, 1, 2, ..., A + 7, c k = b k + x rnti ,k − A − 8 mod 2 for k = A + 8 , A + 9 , A + 10 , ... , A + 23 , <x rnti,0 , x rnti,1 , ..., x rnti,15 > is a Cell-Radio Network Temporary Identifier, C-RNTI, the b k is given by: b k = a k fork = 0, 1,2, ..., A-1, b k = p k-A for k = A, A + 1, A + 2, ..., A + L - 1, a bit sequence <a 0, ,..., a A-1 > is the downlink control information, A is a payload size of the downlink control information, a bit sequence <p 0 ,..., p L-1 > is parity bits for the CRC, L is a number of the parity bits for the CRC, which is 24, the decoding unit is further configured to detect the downlink control information, and the receiving unit is further configured to perform a reception on a physical downlink shared channel, PDSCH, scheduled by the downlink control information. b k = a k fork = 0, 1,2, ..., A-1, b k = p k-A for k = A, A + 1, A + 2, ..., A + L - 1, a bit sequence <a 0, ,..., a A-1 > is the downlink control information, A is a payload size of the downlink control information, a bit sequence <p 0 ,..., p L-1 > is parity bits for the CRC, L is a number of the parity bits for the CRC, which is 24, the decoding unit is further configured to detect the downlink control information, and the receiving unit is further configured to perform a reception on a physical downlink shared channel, PDSCH, scheduled by the downlink control information. <EOS>