Beam selection in millimeter wave systems
AssigneeQUALCOMM Incorporated
InventorsVasanthan Raghavan, Valentin Gheorghiu, Jung Ryu, Junyi Li
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Abstract
A beam selection method and apparatus suitable for millimeter wave (mmW) communication systems is disclosed. In one aspect, a user equipment (UE) may perform a beam sweep procedure to identify suitable downlink beams candidates from one or more gNBs. The UE may generate a beam list by selecting some of the downlink beams for active tracking. When beams on the beam list become unavailable, the UE may compare the number of available beams on the beam list with a threshold value. If the number of available beams falls below the threshold, the UE may perform another beam sweep procedure.
Claims20
A method of operating a User Equipment (UE) comprising:
- generating a first beam list by performing a first beam training procedure, the first beam list including at least one beam from a serving gNB and at least one beam from another gNB;
- tracking a plurality of beams on the first beam list including the at least one beam from the serving gNB and the at least one beam from the another gNB;
- determining a number of beams on the first beam list that are useful;
- comparing the number of beams on the first beam list that are useful with a first threshold;
- and
- generating a second beam list by performing a second beam training procedure when the number of beams in the first beam list that are useful is below the first threshold;
- the second beam list including at least one beam from the serving gNB and least one beam from the another gNB.
A method of operating a gNB:
- determining a first beam threshold for a User Equipment (UE), the first beam threshold indicating a minimum number of suitable beams the UE should track, the suitable beam threshold including at least one beam from the gNB and at least one beam from another gNB;
- and
- transmitting information about the first beam threshold to the UE.
A User Equipment (UE) comprising:
- a receiver configured to receive downlink signals;
- a processor coupled with the receiver configured to:
- generate a first beam list by performing a beam training procedure, the first beam list including at least one beam from a serving gNB and at least one beam from another gNB;
- track a plurality of beams on the first beam list including the at least one beam from the serving gNB and the at least one beam from the another gNB;
- determine a number of beams on the first beam list that are useful;
- comparing the number of beams on the first beam list that are useful with a first threshold;
- and
- generate a second beam list by performing the beam training procedure when the number of beams in the first beam list that are useful is below the first threshold;
- the second beam list including at least one beam from the serving gNB and least one beam form the another gNB.
A User Equipment (UE) comprising:
- means for generating a first beam list by performing a beam training procedure, the first beam list including at least one beam from a serving gNB and at least one beam from another gNB;
- means for tracking a plurality of beams on the first beam list including the at least one beam from the serving gNB and the at least one beam from the another gNB;
- means for determining a number of beams on the first beam list that are useful;
- comparing the number of beams on the first beam list that are useful with a first threshold;
- and
- means for generating a second beam list by performing the beam training procedure when the number of beams in the first beam list that are useful is below the first threshold;
- the second beam list including at least one beam from the serving gNB and least one beam from the another gNB.
Dependencies are inferred from the claim text.