Mobile communication terminal device and method for selecting a virtual carrier for machine-type communications based on measurements of channel conditions
First Claim
1. A method of operating a terminal device in a wireless telecommunications system arranged to communicate with a plurality of terminal devices using frequencies spanning a system frequency bandwidth, wherein the terminal device comprises a tunable transceiver configured to receive downlink transmissions from the wireless telecommunications system using a restricted frequency bandwidth which is smaller than and within the system frequency bandwidth, the method comprising:
- sequentially tuning the transceiver to different frequency locations for the restricted frequency bandwidth within the system frequency bandwidth, the different frequency locations including a plurality of predefined frequency locations that each correspond to a different reduced bandwidth;
making measurements of channel conditions at the different frequency locations to provide a corresponding plurality of measurements of channel conditions, whereinthe sequentially tuning and making measurements are performed without receiving information from the wireless telecommunication system identifying the different frequency locations to be measured;
selecting a frequency location corresponding to a best measurement of channel conditions among the plurality of measurements of channel conditions as a preferred frequency location of a preferred reduced bandwidth for the restricted frequency bandwidth within the system frequency bandwidth; and
communicating an indication of the preferred frequency location for the restricted frequency bandwidth within the system frequency bandwidth and information derived from the plurality of measurements of channel conditions to the wireless telecommunications system.
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Abstract
An apparatus and method providing feedback on channel conditions in a wireless telecommunications system including a base station to communicate with plural terminals device using frequencies spanning a system frequency bandwidth. At least one terminal device is a reduced capability terminal device including a tuneable transceiver configured to receive downlink transmissions from the base station using only a restricted frequency bandwidth smaller than and within the system frequency bandwidth. The reduced capability terminal device is configured to communicate information derived from measurements of channel conditions to the base station. The information may include an indication of measured channel conditions for different frequency locations, or an indication of one or more frequency locations for which corresponding measurement of channel conditions meet a pre-defined selection criterion. The base station subsequently schedules downlink transmissions for the terminal device in a manner that takes account of the information received from the terminal device.
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Citations
21 Claims
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1. A method of operating a terminal device in a wireless telecommunications system arranged to communicate with a plurality of terminal devices using frequencies spanning a system frequency bandwidth, wherein the terminal device comprises a tunable transceiver configured to receive downlink transmissions from the wireless telecommunications system using a restricted frequency bandwidth which is smaller than and within the system frequency bandwidth, the method comprising:
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sequentially tuning the transceiver to different frequency locations for the restricted frequency bandwidth within the system frequency bandwidth, the different frequency locations including a plurality of predefined frequency locations that each correspond to a different reduced bandwidth; making measurements of channel conditions at the different frequency locations to provide a corresponding plurality of measurements of channel conditions, wherein the sequentially tuning and making measurements are performed without receiving information from the wireless telecommunication system identifying the different frequency locations to be measured; selecting a frequency location corresponding to a best measurement of channel conditions among the plurality of measurements of channel conditions as a preferred frequency location of a preferred reduced bandwidth for the restricted frequency bandwidth within the system frequency bandwidth; and communicating an indication of the preferred frequency location for the restricted frequency bandwidth within the system frequency bandwidth and information derived from the plurality of measurements of channel conditions to the wireless telecommunications system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A terminal device configured to operate in a wireless telecommunications system arranged to communicate with a plurality of terminal devices using frequencies spanning a system frequency bandwidth, wherein the terminal device comprises a tunable transceiver configured to receive downlink transmissions from the wireless telecommunications system using a restricted frequency bandwidth which is smaller than and within the system frequency bandwidth, the terminal device comprising:
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circuitry configured to sequentially tune the transceiver to different frequency locations for the restricted frequency bandwidth within the system frequency bandwidth, the different frequency locations each correspond to a different reduced bandwidth; make measurements of channel conditions at the different frequency locations to provide a corresponding plurality of measurements of channel conditions, wherein the sequentially tuning and making measurements are performed without receiving information from the wireless telecommunication system identifying the different frequency locations to be measured; select a frequency location corresponding to a best measurement of channel conditions among the plurality of measurements of channel conditions as a preferred frequency location of a preferred reduced bandwidth for the restricted frequency bandwidth within the system frequency bandwidth; and communicate an indication of the preferred frequency location for the restricted frequency bandwidth within the system frequency bandwidth and information derived from the plurality of measurements of channel conditions to the wireless telecommunications system. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification