Device-to-device (D2D) link adaptation
Channel quality may be measured in a device-to-device (D2D) communication network. The D2D communication network may include one or more D2D wireless transmit/receive units (WTRUs), wherein the D2D WTRUs may communicate using a D2D bandwidth. A D2D WTRU may receive a channel measurement resource configuration corresponding to a channel measurement resource. The D2D WTRU may further receive an RS on the channel measurement resource. The D2D WTRU may measure one or more channel state parameters from the channel measurement resource for a part of bandwidth overlapping with a D2D communication bandwidth, when the RS bandwidth is greater than the D2D communication bandwidth. The D2D WTRU may report the channel state parameters to a controlling entity. The controlling entity may configure a D2D frequency allocation between a transmitting device and a receiving device. The D2D frequency allocation may be based on the time averaged measurement.
1. A method for measuring channel quality in a device-to-device (D2D) communication network, wherein the D2D communication network comprises one or more D2D wireless transmit/receive units (WTRUs), the method comprising:
receiving a channel measurement resource configuration corresponding to a channel measurement resource;
receiving at least one reference signal (RS) on the channel measurement resource based on the received channel measurement resource configuration, wherein the channel measurement resource configuration comprises a reference signal (RS) bandwidth;
determining a sub-set of subcarriers associated with a D2D communication bandwidth, and wherein the D2D communication bandwidth is a sub-set of the RS bandwidth;
selecting the sub-set of subcarriers from the received at least one RS;
measuring one or more channel state parameters associated with the selected sub-set of subcarriers; and
reporting channel state parameters associated with the selected sub-set of subcarriers, over which the D2D WTRUs communicate, to a controlling entity.
2. The method of claim 1 , wherein the channel measurement resource comprises one or more of a subframe, a slot, a resource block (RB), a physical resource block (PRB), or a resource element (RE).
3. The method of claim 1 , wherein the RS is a periodic signal or an aperiodic signal and the RS comprises one or more of a sounding reference signal (SRS), a uplink demodulation reference signal (UL DM-RS), a channel state information reference signal (CSI-RS), a downlink demodulation reference signal (DL DM-RS), a discovery signal, a preamble signal, or a postamble signal.
4. The method of claim 1 , wherein the channel state parameters comprise a metric indicative of a channel quality and wherein the channel state parameters are measured instantaneously.
5. The method of claim 1 , wherein the controlling entity is one of a transmitting device or a receiving device.
6. The method of claim 1 , further comprising measuring the channel state parameters on a time average basis and reporting a time averaged measurement to the controlling entity.
7. The method of claim 6 , further comprising the controlling entity configuring a D2D frequency allocation between a transmitting device and a receiving device, wherein the D2D frequency allocation is based on the time averaged measurement.
8. A D2D wireless transmit/receive unit (D2D WTRU) in a device-to-device (D2D) communication network, wherein the D2D communication network comprises one or more WTRUs, the D2D WTRU comprising:
a processor configured to:
receive a channel measurement resource configuration corresponding to a channel measurement resource;
receive at least one reference signals (RS) on the channel measurement resource based on the received channel measurement resource configuration, wherein the channel measurement resource configuration comprises a reference signal (RS) bandwidth;
determine a sub-set of subcarriers associated with a D2D communication bandwidth, and wherein the D2D communication bandwidth is a sub-set of the RS bandwidth;
select the sub-set of subcarriers from the received at least one RS;
measure one or more channel state parameters associated with the selected sub-set of subcarriers; and
report channel state parameters associated with the selected sub-set of subcarriers, over which the D2D WTRUs communicate, to a controlling entity.
9. The D2D WTRU of claim 8 , wherein the channel measurement resource comprises one or more of a subframe, a slot, a resource block (RB), a physical resource block (PRB), or a resource element (RE).
10. The D2D WTRU of claim 8 , wherein the RS is a periodic signal or an aperiodic signal and the RS comprises one or more of a sounding reference signal (SRS), a uplink demodulation reference signal (UL DM-RS), a channel state information reference signal (CSI-RS), a downlink demodulation reference signal (DL DM-RS), a discovery signal, a preamble signal, or a postamble signal.
11. The D2D WTRU of claim 8 , wherein the channel state parameters comprise a metric indicative of a channel quality and wherein the channel state parameters are measured instantaneously.
12. The D2D WTRU of claim 8 , wherein the controlling entity is one of a transmitting device or a receiving device.
13. The D2D WTRU of claim 8 , wherein the processor is further configured to measure the channel state parameters on a time average basis and reporting a time averaged measurement to the controlling entity.
14. The D2D WTRU of claim 13 , wherein the controlling entity configures a D2D frequency allocation between a transmitting device and a receiving device, wherein the D2D frequency allocation is based on the time averaged measurement.