WTRU measurements handling to mitigate in-device interference
A method for performing measurements in a device with at least two radio access technologies (RATs) is disclosed. The method may include establishing a first measurement schedule on a first RAT, and establishing a first transmission schedule for a second RAT. The method may further include changing at least one of the first measurement schedule or the first transmission schedule to prevent measurements of the first measurement schedule from occurring contemporaneously with transmissions of the first transmission schedule. Transmissions from the second RAT may interfere with measurements on the first RAT. The method may include transitioning from the first measurement mode to a second measurement mode based on determining the second RAT is operating on potentially interfering frequency.
1. A Wireless Transmit/Receive Unit (WTRU) comprising:
at least one antenna;
a first transceiver configured to receive perform at a first frequency via the at least one antenna;
a second transceiver configured to transmit at a second frequency; and
a processor configured to perform measurements based on signals received via the first transceiver, determine an existence of interference between the first transceiver and the second transceiver, and autonomously determine timing of the measurements to be performed based on transmissions of the second transceiver.
2. The WTRU of claim 1 , wherein the processor is configured to send a message to a long term evolution (LTE) network, the message informing the LTE network of the existence of activity by the second transceiver.
3. The WTRU of claim 2 , wherein the processor is further configured to, after autonomously determining the timing of measurements, receive a time division multiplexing (TDM) pattern from the LTE network via the first transceiver, wherein the TDM pattern establishes periods of time for operation by the first transceiver and periods of time for operation of the second transceiver.
4. The WTRU of claim 3 , wherein the processor is configured to determine the timing of the measurements during the periods of time for operation by the first transceiver according to the TDM pattern received from the LTE network.
5. The WTRU of claim 3 , wherein the processor is configured to determine that a first time for at least one measurement occurs during the periods of time for operation by the second transceiver according to the TDM pattern received from the LTE network, wherein the second transceiver is configured to indicate to the processor that the second transceiver will be inactive during the first time.
6. The WTRU of claim 1 , wherein the processor is configured to change the timing of the measurements based on an indication received from a long term evolution (LTE) network.
7. The WTRU of claim 6 , wherein the indication is a discontinuous reception (DRX) indication.
8. The WTRU of claim 1 , wherein the processor is further configured to adjust at least one of a timing of or a frequency of a channel quality index (CQI) report based on the transmissions of the second transceiver.
9. A method performed by a Wireless Transmit/Receive Unit (WTRU), the method comprising:
receiving signals at a first frequency via a first transceiver via at least one antenna;
transmitting on a second frequency via a second transceiver;
performing measurements based on the signals received via the first transceiver;
determining an existence of interference between the first transceiver and the second transceiver; and
autonomously determining timing of the measurements to be performed based on transmissions of the second transceiver.
10. The method claim 9 , further comprising:
sending a message to a long term evolution (LTE) network, the message informing the LTE network of the existence of activity by the second transceiver.
11. The method claim 10 , further comprising:
receiving, after autonomously determining the timing of the measurements, a time division multiplexing (TDM) pattern from the LTE network via the first transceiver, wherein the TDM pattern establishes periods of time for operation by the first transceiver and periods of time for operation of the second transceiver.
12. The method claim 11 , further comprising:
determining the timing of the measurements during the periods of time for operation by the first transceiver according to the TDM pattern received from the LTE network.
13. The method claim 11 , further comprising:
determining that a first time for at least one measurement occurs during the periods of time for operation by the second transceiver according to the TDM pattern received from the LTE network; and
indicating that the second transceiver will be inactive during the first time.
14. The method claim 9 , further comprising:
changing the timing of the measurements based on an indication received from a long term evolution (LTE) network.
15. The method claim 14 , wherein the indication is a discontinuous reception (DRX) indication.
16. The method claim 9 , further comprising:
adjusting at least one of a timing of or a frequency of a channel quality index (CQI) report based on the transmissions of the second transceiver.