Communications devices, infrastructure equipment and methods for communicating via an access interface divided into multiple bandwidth parts
Communications devices for communicating via a wireless access interface are provided. In one embodiment, a communications device comprises transceiver circuitry and controller circuitry configured in combination to receive signals using at least two of a plurality of bandwidth parts of the wireless access interface, each of the bandwidth parts being smaller than and within a carrier bandwidth of the wireless access interface, wherein the at least two of the bandwidth parts at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface, to receive the signals via both of the at least two bandwidth parts, and to decode the signals received via each of the at least two bandwidth parts separately.
1 . A communications device for communicating via a wireless access interface, the communications device comprising:
transceiver circuitry and controller circuitry configured, in combination:
to receive control signals using at least two of a plurality of bandwidth parts of the wireless access interface, each of the plurality of bandwidth parts being smaller than and within a carrier bandwidth of the wireless access interface, wherein the at least two of the plurality of bandwidth parts at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface,
to receive the control signals simultaneously via both of the at least two of the plurality of bandwidth parts that at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface, and
to separately decode the control signals received simultaneously via each of the at least two of the plurality of bandwidth parts that at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface.
2 . The communications device according to claim 1 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
the controller circuitry is configured to select one of the primary bandwidth part and the at least one secondary bandwidth part for receiving or transmitting signals.
3 . The communications device according to claim 1 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
the transceiver circuitry and controller circuitry are configured, in combination, to receive an indication of one of the primary bandwidth part and the at least one secondary bandwidth part for receiving or transmitting signals.
4 . The communications device according to claim 1 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
only the at least one secondary bandwidth part has an inactivity timer associated with it.
5 . The communications device according to claim 1 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part,
the primary bandwidth part and the at least one secondary bandwidth part have a same numerology,
the transceiver circuitry and controller circuitry are configured, in combination, to decode signals received via a larger one of the at least two of the plurality of bandwidth parts, and
the signals are located on the overlapped frequency resources of a smaller one of the at least two of the plurality of bandwidth parts and the larger one of the at least two of the plurality of bandwidth parts.
6 . A communications device for communicating via a wireless access interface, the wireless access interface comprising a plurality of bandwidth parts, each of the plurality of bandwidth parts being smaller than and within a carrier bandwidth of the wireless access interface, the plurality of bandwidth parts comprising a default bandwidth part and at least two non-default bandwidth parts which are not always active, the communications device comprising:
transceiver circuitry and controller circuitry configured, in combination:
to receive signals using the at least two non-default bandwidth parts,
to determine that one of the at least two non-default bandwidth parts is deactivated, and
to receive the signals via at least one of the at least two non-default bandwidth parts that have not been determined to be deactivated in preference to receiving the signals from the default bandwidth part.
7 . The communication device according to claim 6 , wherein the transceiver circuitry and controller circuitry are configured, in combination:
to determine that all of the at least two non-default bandwidth parts are deactivated, and
to receive the signals via the default bandwidth part when all of the at least two non-default bandwidth parts are deactivated.
8 . The communication device according to claim 6 , wherein the determination is made based on an expiry of one or more inactivity timers each associated with one of the at least two non-default bandwidth parts.
9 . The communication device according to claim 6 , wherein the determination is made based on receiving Radio Resource Control, RRC, signaling.
10 . The communication device according to claim 6 , wherein the determination is made based on receiving Downlink Control Information, DCI, signaling.
11 . The communication device according to claim 6 , wherein the determination is made based on receiving Medium Access Control, MAC, Control Entity, MAC-CE, signaling.
12 . The communication device according to claim 6 , wherein
at least two of the plurality of bandwidth parts at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface, and
the transceiver circuitry and controller circuitry are configured, in combination:
to receive the signals via both of the at least two of the plurality of bandwidth parts, and
to decode the signals received via each of the at least two of the plurality of bandwidth parts separately.
13 . The communication device according to claim 12 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
the controller circuitry is configured to select one of the primary bandwidth part and the at least one secondary bandwidth part for receiving or transmitting signals.
14 . The communication device according to claim 12 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
the transceiver circuitry and controller circuitry are configured, in combination, to receive an indication of one of the primary bandwidth part and the at least one secondary bandwidth part for receiving or transmitting signals.
15 . The communication device according to claim 12 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part, and
only the at least one secondary bandwidth part has an inactivity timer associated with it.
16 . The communication device according to claim 12 , wherein
the at least two of the plurality of bandwidth parts include a primary bandwidth part and at least one secondary bandwidth part,
the primary bandwidth part and the at least one secondary bandwidth part have a same numerology,
the transceiver circuitry and controller circuitry are configured, in combination, to decode signals received via a larger one of the at least two of the plurality of bandwidth parts, and
the signals are located on the overlapped frequency resources of a smaller one of the at least two of the plurality of bandwidth parts and the larger one of the at least two of the plurality of bandwidth parts.
17 . The communication device according to claim 12 , wherein the signals are received simultaneously via both of the at least two of the plurality of bandwidth parts that at least partially overlap in frequency resources of the carrier bandwidth and time resources of the wireless access interface.
18 . The communication device according to claim 6 , wherein the transceiver circuitry and controller circuitry are configured, in combination, to transmit, in advance of receiving the signals using at least two of the plurality of bandwidth parts, an indication of a capability of the communications device to receive or transmit signals using the at least two of the plurality of bandwidth parts.