Blank subframe uplink design

摘要

Blank subframe link design uses reduced bandwidth either explicit or derived for Closed Subscriber Group (CSG) cell interference mitigation, enabling a non-allowed User Equipment (UE) to co-exist with CSG cells on the same carrier. One could specify UL blank subframes to orthogonalize non-allowed UE and allowed UE transmissions on UL either via explicit UL blank subframe definition or derived from DL blank subframe definition. Scheduling can orthogonalize data transmissions. A femto cell temporarily reducing uplink bandwidth can mitigate uplink control channel residual interference from a non-allowed UE. A relay configures RACH occasion to coincide with non-blank UL subframes as much as possible. UE knowledge of RACH occasion is sufficient to start RACH and hand over procedure. RACH occasions with 10 ms periodicity are supported by assigning all odd/even uplink HARQ interlaces to relay. RACH occasions with 20 ms periodicity are supported by assigning any of the 1/4 UL HARQ interlaces to relay.

主权项

1. A method for interference mitigation in a wireless communication system, the method comprising:
determining a half duplex schedule for non-simultaneous receiving and transmitting by a relay with an access node and at least one user equipment (UE), wherein the half duplex schedule includes a first set of subframes and a second set of subframes, the first set of subframes being allocated for communication between the relay and the access node and the second set of subframes being allocated for communication between the relay and the at least one UE; determining a physical random access channel configuration having a random access channel occasion that coincides with the second set of subframes; and facilitating a random access channel procedure between the at least one UE and the access node via the relay by using the physical random access channel configuration.