Communications device
A communications device including a transmitter transmitting data signals to a network element of a wireless communications system using shared resources of an uplink of a first wireless access interface included in the network element, a receiver receiving data signals from the network element using shared resources of a downlink of the first wireless access interface, allocations of the shared resources being made by the network element and the uplink of the first wireless access interface is within a first set of resources, and a controller controlling the transmitter and receiver to transmit/receive signals representing data to/from another communications device using a second wireless access interface within a second set of resources formed from resources of the first set of resources for preferable allocation for device-to-device communications by the network element, resources of the second wireless access interface being time divided into at least a data and control regions.
1. Circuitry for a communications device, the circuitry comprising:
transmitter circuitry configured to transmit uplink signals;
receiver circuitry configured to receive downlink signals; and
processing circuitry configured to control the transmitter circuitry and the receiver circuitry to:
communicate with a wireless network using at least a first subset of uplink shared resources selected from a set of uplink shared resources,
exchange device-to-device (D2D) signals with another communications device using a second subset of uplink shared resources selected from the set of uplink shared resources, the second subset of uplink shared resources not overlapping with the first subset of uplink shared resources, the second subset of uplink shared resources being a virtual channel for bi-directional D2D communications within the set of uplink shared resources,
wherein the first and second subsets of uplink shared resources are allocated by the wireless network,
wherein the second subset of uplink resources are contiguous in time and frequency across an entirety of two contiguous subframes,
wherein, within the two contiguous subframes, the second subset of uplink resources is divided in the time domain into a single D2D control region, plural D2D data regions and plural D2D reference symbol regions in accordance with a predetermined pattern,
wherein the first subset of shared resources is within a first frequency range and the second subset of shared resources is within a second frequency range; and
wherein the second frequency range is contiguous in frequency with and smaller than the first frequency range.
2. The circuitry of claim 1 , wherein
the processing circuitry is configured to control the transmitter circuitry and the receiver circuitry to
transmit and to receive D2D resource allocation messages in the D2D control region; and
transmit and to receive the D2D signals to and from the other communications device using the second subset of uplink shared resources according to the D2D resource allocation messages.
3. The circuitry of 1 , wherein
the processing circuitry is configured to control the transmitter circuitry and receiver circuitry to transmit and to receive D2D reference symbols for channel estimation in the D2D reference symbol regions.
4. The circuitry of claim 1 , wherein the single D2D control region is contiguous in time with a first D2D reference symbol region of the plural D2D reference symbol regions.
5. The circuitry of claim 1 , wherein the processing circuitry is configured to control the receiver circuitry to receive an indication of the second subset of uplink shared resources from the wireless network.
6. The circuitry of claim 1 , wherein
the uplink of the first wireless access interface includes control channels positioned toward the upper and lower frequencies of the first frequency range, and
the second frequency range is contiguous in frequency with at least one of the control channels.
7. The circuitry of claim 1 , wherein
the processing circuitry is configured to control the receiver circuitry, in response to an absence of a D2D data region resource allocation relating to the communications device in the D2D control region, to enter a reduced-power state.
8. A method performed by a communications device, the method comprising:
communicating with a wireless network using at least a first subset of uplink shared resources selected from a set of uplink shared resources; and
exchanging device-to-device (D2D) signals with another communications device using a second subset of uplink shared resources selected from the set of uplink shared resources, the second subset of uplink shared resources not overlapping with the first subset of uplink shared resources, the second subset of uplink shared resources being a virtual channel for bi-directional D2D communications within the set of uplink shared resources,
wherein the first and second subsets of uplink shared resources are allocated by the wireless network,
wherein the second subset of uplink resources are contiguous in time and frequency across an entirety of two contiguous subframes,
wherein, within the two contiguous subframes, the second subset of uplink resources is divided in the time domain into a single D2D control region, plural D2D data regions and plural D2D reference symbol regions in accordance with a predetermined pattern,
wherein the first subset of shared resources is within a first frequency range and the second subset of shared resources is within a second frequency range, and
wherein the second frequency range is contiguous in frequency with and smaller than the first frequency range.
9. The method of claim 8 , further comprising:
transmitting and receiving D2D resource allocation messages in the D2D control region; and
transmitting and receiving the D2D signals to and from the other communications device using the second subset of uplink shared resources according to the D2D resource allocation messages.
10. The method of claim 8 , further comprising:
transmitting and receiving D2D reference symbols for channel estimation in the D2D reference symbol regions.
11. The method of claim 8 , wherein the single D2D control region is contiguous in time with a first D2D reference symbol region of the plural D2D reference symbol regions.
12. The method of claim 8 , wherein
the uplink of the first wireless access interface includes control channels positioned toward the upper and lower frequencies of the first frequency range, and
the second frequency range is contiguous in frequency with at least one of the control channels.
13. The method of claim 8 , further comprising:
receiving an indication of the second set of uplink shared resources from the wireless network.