Methods and devices for beam selection
One embodiment of the present disclosure relates to a method for use in a terminal device. The method comprises: obtaining signal quality measurements of plural beams; and selecting at least one serving beam from the plural beams depending upon the obtained signal quality measurements and scheduling constraint information of the plural beams. The embodiments of the present disclosure also relates to relevant radio access node device. When selecting or reselecting a serving beam for a terminal device, the scheduling constrains applied on the beams/links can be taken into consideration, which may allow an mmW network operating the link-specific coordination to control the probability that a terminal device is served by a coordinated beam on constrained radio resources at a lower level as possible.
1. A method for operating a radio access node device, comprising:
sending to a terminal device a configuration signaling indicating scheduling constraint information of plural beams transmitted by the radio access node device,
wherein the scheduling constraint information indicates, via a scheduling constraint indicator, whether each beam of the plural beams has a scheduling constraint, wherein a first plurality of the plural beams are indicated to have a scheduling constraint and a second plurality of the plural beams are indicated to have no scheduling constraint, and
wherein a beam under the scheduling constraint is only allowed to be scheduled at a part of total available radio resources in coordination with at least one interfering beam;
selecting a serving beam from the plural beams by the terminal device based on the configuration signaling received; and
communicating with the terminal device over the serving beam selected by the terminal device from the plural beams,
wherein a predefined criterion on which the selecting the serving beam is partially based comprises the serving beam having a largest signal quality measurement among the beams having no scheduling constraint.
2. The method according to claim 1 , wherein constrained radio resources schedulable to the beam having the scheduling constraint are at least partially orthogonal to radio resources schedulable to the at least one interfering beam.
3. A terminal device, comprising a processor and a memory in which contain instructions executable by the processor, causing the terminal device to:
obtain signal quality measurements of plural beams;
receive a configuration signalling transmitted from a radio access node device,
wherein the configuration signaling indicates, via a scheduling constraint indicator, whether each beam of the plural beams has a scheduling constraint, wherein a first plurality of the plural beams are indicated to have a scheduling constraint and a second plurality of the plural beams are indicated to have no scheduling constraint, and
wherein a beam under the scheduling constraint is only allowed to be scheduled at a part of total available radio resources in coordination with at least one interfering beam; and
select at least one serving beam from the plural beams depending upon the obtained signal quality measurements and scheduling constraint information of the plural beams, wherein a predefined criterion on which the selecting a serving beam is partially based comprises the serving beam having a largest signal quality measurement among the beams having no scheduling constraint.
4. The terminal device of claim 3 , wherein the constrained radio resources schedulable to the beam having the scheduling constraint are at least partially orthogonal to radio resources schedulable to the at least one interfering beam.
5. A radio access node device, comprising a processor and a memory in which contain instructions executable by the processor, causing the radio access node device to:
send a configuration signaling to a terminal device that indicating scheduling constraint information of plural beams transmitted by the radio access node device,
wherein the scheduling constraint information indicates, via a scheduling constraint indicator, whether each beam of the plural beams has a scheduling constraint, wherein a first plurality of the plural beams are indicated to have a scheduling constraint and a second plurality of the plural beams are indicated to have no scheduling constraint, and
wherein a beam under the scheduling constraint is only allowed to be scheduled at a part of total available radio resources in coordination with at least one interfering beam;
select a serving beam from the plural beams by the terminal device based on the configuration signaling received; and
communicate with the terminal device over a serving beam selected by the terminal device from the plural beams,
wherein a predefined criterion on which the selecting the serving beam is partially based comprises the serving beam having a largest signal quality measurement among the beams having no scheduling constraint.
6. The radio access node device of claim 5 , wherein constrained radio resources schedulable to the beam having the scheduling constraint are at least partially orthogonal to radio resources schedulable to the at least one interfering beam.