Systems and methods for component carrier selection in a wireless communication system
The present disclosure relates to component carrier (CC) selection in a wireless communication system. A user equipment (UE) that is in idle mode may receive a reference signal (RS) from an evolved Node B (eNB), obtain signal quality measurements with respect to the RS, and switch to a new CC based on the signal quality measurements. For a UE that is in connected mode, an eNB may obtain uplink channel condition information corresponding to uplink CCs, obtain downlink channel condition information corresponding to downlink CCs, and select a CC pair for the UE to use based on the uplink channel condition information and the downlink channel condition information.
1. A method for a user equipment (UE) that is in connected mode, comprising:
communicating with a source evolved Node B (eNB) using a plurality of component carriers;
receiving a command to make measurements on a target eNB;
measuring time/frequency resources; and
sending results of the measurements on the time/frequency resources to the source eNB;
wherein the source eNB initiates a determination of a target component carrier (CC) of a target eNB;
wherein the source eNB forwards the results of the measurements on the time/frequency resources to the target eNB;
wherein the source eNB and the target eNB communicate to determine time/frequency resources that the UE will use to make the measurements; and
wherein the target CC is for the UE to use following handoff of the UE from the source eNB to the target eNB.
2. The method of claim 1 , wherein the source eNB initiates the determination of the target CC in response to the source eNB detecting that the UE should prepare for the handoff from the source eNB to the target eNB.
3. The method of claim 1 , wherein the source eNB initiates the determination of the target CC in response to the source eNB preparing the UE for the handoff from the source eNB to the target eNB.
4. The method of claim 1 , further comprising:
the UE sending results of the measurements to the target eNB;
the target eNB analyzing the results and determining the target CC; and
the target eNB informing the UE of the target CC.
5. The method of claim 1 , further comprising:
the target eNB analyzing the results and determining the target CC;
the target eNB informing the source eNB of the target CC; and
the source eNB informing the UE of the target CC.
6. A source evolved Node B (eNB) comprising:
a processor;
memory in electronic communication with the processor;
instructions stored in the memory, the instructions being executable to:
communicate with a user equipment (UE) using a plurality of component carrier (CC);
initiate a determination of a target CC of a target evolved Node B(eNB), wherein the target CC is for the UE to use following handoff of the UE from the source eNB to the target eNB;
command the UE to make measurements on the target eNB;
communicate with the target eNB to determine time/frequency resources that the UE will use to make the measurements;
receive results of the measurements on the time/frequency resources from the UE; and
forward the results of the measurements on the time/frequency resources to the target eNB.
7. A non-transitory processor-readable medium comprising executable instructions, the instructions being executable to:
communicate with a source evolved Node B (eNB) using a plurality of component carriers;
receive a commands to make measurements on a target eNB;
measure time/frequency resources;
send results of the measurements on the time/frequency resources to the source eNB;
wherein the source eNB initiates a determination of a target component carrier (CC) of a target eNB;
wherein the source eNB forwards the results of the measurements on the time/frequency resources to the target eNB;
wherein the source eNB and that target eNB communicate to determine time/frequency resources that the UE will use to make the measurements; and
wherein the target CC is for the UE to use following handoff of the UE from the source eNB to the target eNB.