Terminal apparatus, base station apparatus, and communication method
A terminal apparatus is a terminal apparatus for communicating via a primary cell and a secondary cell, the terminal apparatus including: a receiver configured to receive an activation/deactivation MAC CE indicating activation of the secondary cell; and a medium access control layer processing unit configured to: activate a first downlink BWP in multiple downlink BWPs in a case that the activation/deactivation MAC CE is received and the secondary cell is not activated; and not to activate the first downlink BWP in a case that the activation/deactivation MAC CE is received, the secondary cell is activated, and a second downlink BWP of the secondary cell is activated. The first downlink BWP is different from the second downlink BWP.
1. A terminal apparatus that performs communication via a primary cell and a secondary cell, the terminal apparatus comprising:
reception circuitry configured to receive an activation/deactivation Medium Access Control (MAC) Control Element (CE) indicating activation of the secondary cell; and
medium access control layer processing circuitry configured to:
activate a first downlink bandwidth part (BWP) in multiple downlink BWPs included in the secondary cell in a case that the activation/deactivation MAC CE is received and the secondary cell has not been activated, and
not to activate the first downlink BWP in a case that the activation/deactivation MAC CE is received, and the secondary cell and a second downlink BWP of the secondary cell have been activated before the activation/deactivation MAC CE is received, wherein
the first downlink BWP is different from the second downlink BWP.
2. The terminal apparatus according to claim 1 , wherein
activating the first downlink BWP is indicated by a Radio Resource Control (RRC) message received from a base station apparatus.
3. A base station apparatus that performs communication via a primary cell and a secondary cell, the base station apparatus comprising:
transmission circuitry configured to transmit an activation/deactivation Medium Access Control (MAC) Control Element (CE) indicating activation of the secondary cell to a terminal apparatus; and
medium access control layer processing circuitry configured to control a downlink bandwidth part (BWP) to be activated in multiple downlink BWPs included in the secondary cell by transmitting the activation/deactivation MAC CE, wherein:
a first downlink BWP in the multiple downlink BWPs is activated by the terminal apparatus in a case that the terminal apparatus receives the activation/deactivation MAC CE and the secondary cell has not been activated,
the first downlink BWP in the multiple downlink BWPs is not activated by the terminal apparatus in a case that the terminal apparatus receives the activation/deactivation MAC CE, and the secondary cell and a second downlink BWP of the secondary cell have been activated before the activation/deactivation MAC CE is received, and
the first downlink BWP is different from the second downlink BWP.
4. The base station apparatus according to claim 3 , wherein
activating the first downlink BWP is indicated by transmitting a Radio Resource Control (RRC) message.
5. A communication method used for a terminal apparatus that performs communication via a primary cell and a secondary cell, the communication method comprising:
receiving an activation/deactivation Medium Access Control (MAC) Control Element (CE) indicating activation of the secondary cell;
activating a first downlink bandwidth part (BWP) in multiple downlink BWPs included in the secondary cell in a case that the activation/deactivation MAC CE is received and the secondary cell has not been activated; and
not activating the first downlink BWP in a case that the activation/deactivation MAC CE is received, and the secondary cell and a second downlink BWP of the secondary cell have been activated before the activation/deactivation MAC CE is received, wherein
the first downlink BWP is different from the second downlink BWP.
6. A communication method used for a base station apparatus that performs communication via a primary cell and a secondary cell, the communication method comprising:
transmitting an activation/deactivation Medium Access Control (MAC) Control Element (CE) indicating activation of the secondary cell to a terminal apparatus; and
controlling a downlink bandwidth part (BWP) to be activated in multiple downlink BWPs included in the secondary cell by transmitting the activation/deactivation MAC CE, wherein:
a first downlink BWP in the multiple downlink BWPs is activated by the terminal apparatus in a case that the terminal apparatus receives the activation/deactivation MAC CE and the secondary cell has not been activated,
the first downlink BWP in the multiple downlink BWPs is not activated by the terminal apparatus in a case that the terminal apparatus receives the activation/deactivation MAC CE, and the secondary cell and a second downlink BWP of the secondary cell have been activated before the activation/deactivation MAC CE is received, and
the first downlink BWP is different from the second downlink BWP.