Abstract:
A communications device and method for performing device-to-device communications. The method includes receiving, from a mobile communications network, an indication of whether a communications device can use at least one of first communications resources of a wireless access interface for performing device-to-device communications in accordance with a first mode of operation or second communications resources of the wireless access interface for performing device to device communications in accordance with the second mode of operation, and depending on the indication provided by the mobile communications network and the configuration of the first communications resources and/or the second communications resources, transmitting signals to the one or more other communications devices via the first communications resources or transmitting signals to the one or more other communications devices via the second communications resources in accordance with the second mode of operation using the device to device communications protocol.
Abstract:
A method of operating a terminal device and a base station in a wireless telecommunications system to communicate with one another using a primary component carrier operating on radio resources within a first frequency band and a secondary component carrier operating on radio resources within a second frequency band. The terminal device makes measurements of radio usage in the second frequency band, and transmits an indication of the measurements to the base station. The base station then establishes a configuration setting for the secondary component carrier. The configuration setting is associated with a validity period during which the base station communicates data to the terminal device using the primary component carrier and the secondary component carrier operating in accordance with its configuration setting.
Abstract:
A communications device to transmit data to a mobile communications network includes one or more network elements providing a wireless access interface for communication. The communications device includes a controller controlling a transmitter to transmit a random access message to a first network element via a random access channel of the wireless access interface common to one or more other communications devices, to receive in response an acknowledgement indicating an allocation of communications resources of a shared up-link channel for the communications device to transmit signals to the mobile communications network, or a negative acknowledgment indicating the communications device has not been allocated communications resources of the shared up-link channel. After detecting random access failure conditions by the controller, the controller in combination with the transmitter re-transmits the random access message one or more times, with a variable delay greater than or equal to a delay of a previous re-transmission.
Abstract:
A communications device can identify one or more sections of plural predetermined sections, divided into time-units, of shared communications resources of a wireless access interface for transmitting data signals to one or more other communications device. The communications device detects whether another of the one or more communications devices is transmitting signals in one or more of the identified sections of the shared communications resources in at least one time divided unit, and if signals transmitted by another of the communications devices are not detected, the device transmits signals in the identified one or more predetermined sections of the shared communications resources for at least one of the time divided units, and then, after a collision avoidance time, detects for at least one subsequent time unit whether another of the one or more communications devices transmits signals in one or more of the identified sections of the shared communications resources.
Abstract:
A wireless telecommunications system in which downlink communications are made using a radio interface that spans a system frequency bandwidth (host carrier) and supports at least some communications from a base station to least some terminal devices within a plurality of restricted frequency bands (virtual carriers) which are narrower than and within the system frequency bandwidth. A terminal device conveys an indication of its identity, e.g. an IMSI, to the base station during an initial connection procedure as the terminal device seeks to access the radio interface. The terminal device and the base station both determine a selected restricted frequency band from among the plurality of restricted frequency bands based on the identity of the terminal device in the same way. Thus the terminal device and the base station select the same restricted frequency band and can accordingly configure their respective transceivers to allow for downlink communications between them within the selected restricted frequency band.
Abstract:
A communications device to transmit data to a mobile communications network includes one or more network elements providing a wireless access interface for communication. The communications device includes a controller controlling a transmitter to transmit a random access message to a first network element via a random access channel of the wireless access interface common to one or more other communications devices, to receive in response an acknowledgement indicating an allocation of communications resources of a shared up-link channel for the communications device to transmit signals to the mobile communications network, or a negative acknowledgment indicating the communications device has not been allocated communications resources of the shared up-link channel. After detecting random access failure conditions by the controller, the controller in combination with the transmitter re-transmits the random access message one or more times, with a variable delay greater than or equal to a delay of a previous re-transmission.
Abstract:
A user equipment comprises a wireless interface for communication with a cellular communication network. The user equipment has different operating states which include a power saving state. Transitions between the power saving state and a further operating state different from the power saving state may be triggered by a device-to-device signal received directly from a further user equipment.
Abstract:
The present technique provides a terminal device for use with a wireless telecommunications system, the terminal device comprising a receiver, a transmitter and a controller, wherein the controller is configured: to conduct a first measurement of a parameter associated with a radio signal transmitted by infrastructure equipment of the wireless telecommunications network and received by the receiver; to determine whether the measured parameter meets a predetermined criteria; and when the measured parameter is determined to meet the predetermined criteria, to conduct a second measurement of a parameter associated with a radio signal transmitted by infrastructure equipment of the wireless telecommunications network and received by the receiver. The present technique also provides an associated method and circuitry.
Abstract:
Schemes for supporting device-to-device, D2D, communications between terminal devices in a wireless telecommunication system. A network entity, e.g. a base station, establishes a set pool of radio resources to be reserved for use for D2D communications and communicates an indication of these resources to terminal devices. On an ongoing basis the network entity monitors the extent to which the set of radio resources reserved for D2D communications is being used, for example based on feedback received from terminal devices or its own measurements. If it is determined the set of radio resources reserved for D2D communications is being under-utilized or over-utilized, the network entity may establish an updated set of radio resources to be used for D2D communications, and communicate this to the terminal devices. Thus a mechanism is provided for dynamically adjusting the size of a set of resources available for D2D communications in response to changing resource utilization.
Abstract:
A method for use in a wireless telecommunications network, the mobile telecommunications network comprising: a core network; base stations supported by the core network and each providing wireless connectivity within at least one base station cell where the cells are arranged into a master cell group under control of a master base station and a secondary cell group under control of a secondary base station; and a terminal device configured to communicate wirelessly with the base stations including by the use of a split radio bearer receivable at the secondary base station for splitting between the secondary base station and the master base station before delivery to the terminal device; the method comprising: when the secondary base station exhausts a supply of unique parameter sets used in security ciphering of received split radio bearers, the secondary base station sends a notification to the master base station of a requirement to alter data handling resources allocated for handling split radio bearers received from the secondary base station in one or both of the master base station and the terminal device; and the master base station, in response to the notification, operating to effect an alteration in the said data handling resources.