Telecommunications apparatus and methods
Although not part of the telecommunications system 400 itself, also shown in FIG. 4 are some other devices which are operable to wirelessly communicate with one another and which are operating within the radio environment of the telecommunications system 400 . In particular, there is a pair of wireless access devices 416 communicating with one another via radio link 418 operating in accordance with a Wi-Fi standard and a pair of Bluetooth devices 420 communicating with one another via radio link 422 operating in accordance with a Bluetooth standard. These other devices represent a potential source of radio interference for the telecommunications system 400 . It will be appreciated that in practice there will typically be many more such devices operating in the radio environment of the wireless telecommunications system 400 , and only two pairs of devices 416, 420 are shown in FIG. 4 for simplicity.
1 . A terminal device configured to operate in a wireless telecommunications system and for communicating on a primary cell supporting a primary component carrier on radio resources within a first frequency band and a secondary cell supporting a secondary component carrier on radio resources within a second frequency band, the terminal device comprising:
circuitry configured to
receive an allocation message indicating an allocation of transmission resources to be used for receiving data at the terminal device on the secondary component carrier;
identify one of a plurality of configuration settings for the secondary component carrier to be used for receiving the data; and
receive the data using the allocated resources on the secondary component carrier operating in accordance with the identified one of the plurality of configuration settings, wherein
the first frequency band is a licensed frequency band, and the second frequency band is an unlicensed frequency band.
2 . The terminal device of claim 1 , wherein
communications between the wireless telecommunications system and the terminal device are made with a radio frame structure comprising a plurality of subframes, and
the selected one of the plurality of configuration settings for the secondary component carrier is valid for one or more subframes.
3 . The terminal device of claim 1 , wherein the circuitry is configured to:
receive, in association with the allocation message, an indication of a selected one of a plurality of configuration settings for the secondary component carrier to be used for receiving the data; and
identify the one of a plurality of configuration settings for the secondary component carrier to be used for receiving the data based on the indication in the allocation message.
4 . The terminal device of claim 3 , wherein
the indication comprises a pointer to an entry in a table of potential configuration settings established according to an operating standard for the wireless telecommunications system.
5 . The terminal device of claim 3 , wherein the circuitry is configured to:
receive a further allocation message indicating a further allocation of transmission resources to be used for receiving further data at the terminal device on the secondary component carrier;
receive, in association with the further allocation message, a further indication of another selected one of the plurality of configuration settings for the secondary component carrier to be used for receiving the further data; and
receive the further data using the further allocated resources on the secondary component carrier operating in accordance with the other selected one of the plurality of configuration settings.
6 . The terminal device of claim 3 , wherein
the allocation message includes the indication of the selected one of the plurality of configuration settings for the secondary component carrier to be used for communicating the data.
7 . The terminal device of claim 3 , wherein
the indication of the selected one of the plurality of configuration settings for the secondary component carrier is specific to the associated allocation message.
8 . The terminal device of claim 3 , wherein
the indication of the selected one of the plurality of configuration settings is associated with a plurality of allocation messages indicating allocations of transmission resources to be used for receiving data at the terminal device on the secondary component carrier.
9 . The terminal device of claim 3 , wherein
the indication of the selected one of the plurality of configuration settings is received by the terminal device from the wireless telecommunications system using layer 1 signaling.
10 . The terminal device of claim 3 , wherein
the indication of the selected one of the plurality of configuration settings is received in the same subframe as the allocation message with which it is associated.
11 . The terminal device of claim 3 , wherein
the indication of the selected one of the plurality of configuration settings is received in a subframe that is before a subframe containing the allocation message with which it is associated.
12 . The terminal device of claim 3 , wherein
the allocation message and the indication of a selected one of the plurality of configuration settings for the secondary component carrier are received using transmission resources in the first frequency band.
13 . The terminal device of claim 1 , wherein
an indication of a plurality of configuration settings for the secondary component carrier are received using transmission resources in the first frequency band.
14 . The terminal device of claim 1 , wherein
an indication of a plurality of configuration settings for the secondary component carrier are received using radio resource control (RRC) signaling.
15 . The terminal device of claim 1 , wherein the circuitry is configured to:
perform channel quality measurements for the secondary component carrier; and
convey an indication of the channel quality measurements to the wireless telecommunications system.
16 . The terminal device of claim 1 , wherein
the second, unlicensed frequency band comprises radio resources which are shared with wireless communication devices that are not part of the wireless telecommunications system.
17 . The terminal device of claim 1 , wherein the circuitry is configured to:
make measurements of radio usage in the second, unlicensed frequency band and transmit an indication of the measurements of radio usage in the second, unlicensed frequency band to the wireless telecommunications system prior to receiving an indication of the identified one of the plurality of configuration settings for the secondary component carrier.
18 . A method of operating network infrastructure equipment in a wireless telecommunications system for communicating with a terminal device on a primary cell supporting a primary component carrier on radio resources within a first frequency band and a secondary cell supporting a secondary component carrier on radio resources within a second frequency band, wherein the method comprises:
transmitting to the terminal device an allocation message indicating an allocation of transmission resources to be used by for communicating data to the terminal device on the secondary component carrier;
transmitting to the terminal device in association with the allocation message an indication of a selected one of a plurality of configuration settings for the secondary component carrier to be used for communicating the data; and
transmitting the data to the terminal device using the allocated resources on the secondary component carrier operating in accordance with the selected one of the plurality of configuration settings, wherein
the first frequency band is a licensed frequency band, and the second frequency band is an unlicensed frequency band.
19 . Network infrastructure equipment for use in a wireless telecommunications system for communicating with a terminal device on a primary cell supporting a primary component carrier on radio resources within a first frequency band and a secondary cell supporting a secondary component carrier on radio resources within a second frequency band, wherein the network infrastructure equipment comprises:
circuitry configured to
transmit to the terminal device an allocation message indicating an allocation of transmission resources to be used by for communicating data to the terminal device on the secondary component carrier;
transmit to the terminal device in association with the allocation message an indication of a selected one of a plurality of configuration settings for the secondary component carrier to be used for communicating the data; and
transmit the data to the terminal device using the allocated resources on the secondary component carrier operating in accordance with the selected one of the plurality of configuration settings, wherein
the first frequency band is a licensed frequency band, and the second frequency band is an unlicensed frequency band.