Wireless device for supporting cellular communications and D2D communications
One disclosure of the present specification provides a wireless device for supporting a first band for cellular communications and a second band for D2D communications. The wireless device may comprising: a main antenna; a first RF chain configured to process a first transmission signal and a second transmission signal wherein the first and second transmission signals are to be transmitted via the main antenna using uplink bands of the first and second bands respectively; a second RF chain configured to process a first reception signal, wherein the first reception signal is received via the main antenna using an uplink band of the second band; a third RF chain configured to process a second reception signal, wherein the second reception signal is received via the main antenna using a downlink band of the first band.
1. A wireless device for supporting a first band for LTE (Long Term Evolution)/LTE-A (LTE-Advanced) based cellular communications and a second band for D2D (Device to Device) communications, the device comprising:
a main antenna;
a first RF (Radio Frequency) chain configured to process a first transmission signal and a second transmission signal wherein the first and second transmission signals are to be transmitted via the main antenna using uplink bands of the first and second bands respectively;
a second RF chain configured to process a first reception signal, wherein the first reception signal is received via the main antenna using an uplink band of the second band;
a third RF chain configured to process a second reception signal, wherein the second reception signal is received via the main antenna using a downlink band of the first band;
a switch disposed between the first RF chain and the second RF chain for selecting one between the transmission signal associated with the first RF chain and the reception signal associated with the second RF chain; and
a first duplexer coupled to the switch, the third RF chain and the main antenna for enabling separation between the signal using the first band and the signal using the second band.
2. The device of claim 1 , further comprising:
a diversity antenna;
a fourth RF chain configured to process a third reception signal wherein the third reception signal is received via the diversity antenna using the uplink band of the second band;
a fifth RF chain configured to process a fourth reception signal wherein the fourth reception signal is received via the diversity antenna using the downlink band of the first band; and
a second duplexer coupled to the fourth RF chain, the fifth RF chain and the diversity antenna for enabling separation between the signal using the first band and the signal using the second band.
3. The device of claim 1 , further comprising:
a one of a quadplexer, a triplexer and a hexplexer instead of the second duplexer based on aggregated bands according to carrier aggregation of the cellular communications.
4. The device of claim 1 , wherein the switch is configured to operate based on a TDD (Time Division Duplex) scheme.
5. The device of claim 1 , wherein the first RF chain include a power amplifier to be configured to amplify the first transmission signal and second transmission signal.
6. The device of claim 1 , wherein the uplink band of the second band has an inter-band relationship with the uplink band of the first band.
7. The device of claim 1 , wherein each of the second transmission signal and the first reception signal contains a discovery signal on a PSDCH (Physical Sidelink Discovery Channel).