Adaptive scheduling for half-duplex wireless terminals
Adaptation is introduced into allocation of uplink and downlink subframes in wireless communication systems that support full-duplex and half-duplex mobile terminals, thus reducing interference between mobile terminals. In an exemplary method for allocating uplink and downlink timeslots in a wireless communication system supporting full-duplex and half-duplex mobile terminals, a base station determines that a mobile terminal is capable of only half-duplex operation and allocates one or more uplink subframes and one or more downlink subframes to the first mobile terminal, for each of a plurality of frames, so that none of the allocated uplink subframes overlaps in time with an allocated downlink subframe. The allocation of uplink subframes and downlink subframes is varied between consecutive ones in at least a first series of frames according to a pre-determined pattern. In some embodiments, the method further includes transmitting an allocation message to the first mobile terminal, designating the pre-determined pattern.
1. A method of allocating uplink and downlink timeslots in a wireless communication system supporting full-duplex and half-duplex mobile terminals, the method comprising:
for each frame in a first series of frames, assigning a first fixed allotment of one or more uplink subframes and one or more downlink subframes to a first mobile terminal;
detecting that excessive interference in at least one of the allocated downlink subframes is likely or has occurred;
responsive to said detecting, assigning a second fixed allotment of uplink and downlink subframes to the first mobile terminal for use in a second series of frames, wherein at least one allotted downlink subframe differs from the first fixed allotment; and
wherein detecting that excessive interference in at least one of the allocated downlink subframes is likely or has occurred comprises predicting that interference to the first mobile terminal from a second mobile terminal is likely by comparing one or more of scheduling information for the first and second mobile terminals, time alignment values for the first and second mobile terminals, and signal quality reports from the first and second mobile terminals.
2. The method of claim 1 , wherein detecting that excessive interference in at least one of the allocated downlink subframes is likely or has occurred is based on received signal quality reports from the first mobile terminal.
3. The method of claim 1 , further comprising transmitting first and second allocation messages to the first mobile terminal, the first and second allocation messages designating the first and second fixed allotments, respectively.
4. A base station for use in a wireless communication system supporting full-duplex and half-duplex mobile terminals, the base station comprising a control unit configured to:
for each frame in a first series of frames, assign a first fixed allotment of one or more uplink subframes and one or more downlink subframes to the first mobile terminal;
detect that excessive interference in at least one of the allocated downlink subframes is likely or has occurred;
responsive to said detection, assign a second fixed allotment of uplink and downlink subframes to the first mobile terminal for use in a second series of frames, wherein at least one allotted downlink subframe differs from the first fixed allotment; and
wherein the control unit is configured to detect that excessive interference in at least one of the allocated downlink subframes is likely or has occurred by predicting that interference to the first mobile terminal from a second mobile terminal is likely by comparing one or more of scheduling information for the first and second mobile terminals, time alignment values for the first and second mobile terminals, and signal quality reports from the first and second mobile terminals.
5. The base station of claim 4 , wherein the control unit is configured to detect that excessive interference in at least one of the allocated downlink subframes is likely or has occurred based on received signal quality reports from the first mobile terminal.
6. The base station of claim 4 , further comprising transmitting first and second allocation messages to the mobile terminal, the first and second allocation messages designating the first and second fixed allotments, respectively.