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D2D relays as an underlay in LTE uplink

  • US 9,049,668 B2
  • Filed: 09/06/2012
  • Issued: 06/02/2015
  • Est. Priority Date: 09/06/2012
  • Status: Active Grant
First Claim
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1. A method of wireless communication at a user equipment (UE), comprising:

  • obtaining, by the UE, at least one of a pathloss measurement to a base station or a maximum tolerable interference to the base station, wherein the UE is a relay having a backhaul link connected to the base station and an access link connected to a second UE, and wherein the backhaul link and the access link are allocated a same spectrum of an uplink to the base station;

    determining, by the UE, a maximum transmission power for the access link to the second UE based on the at least one of the pathloss measurement or the maximum tolerable interference to the base station such that transmission from the UE to the second UE on the access link does not interfere with concurrent transmission from the UE to the base station on the backhaul link; and

    communicating, concurrently, on the access link to the second UE at a transmission power less than the determined maximum transmission power and on the backhaul link to the base station.

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