Downlink measurement design in new radio
Measurement modeling and filtering may include configurable cell quality derivation method is used for multi-beam based NR networks; a common measurement model that considers different characteristics of the two measurement signals, NR synchronization signal and additional reference signal; and a multi-level measurement filtering approach that handles different mobility scenarios in an NR network. Measurement configuration and procedures may include a measurement gap design during which UE may use to perform measurements for beam sweeping based NR networks; a group of triggering events that may be used to trigger UE mobility management in an NR network; a content format that may be used for the transmission of UE measurement report; a measurement object design (the object on which a UE may perform the measurements) to reduce UE measurement overhead and cost; and a downlink measurement based inter-cell handover procedure that may be used in an NR network.
1. A first apparatus comprising a processor, a memory, and communication circuitry, the first apparatus being capable of connecting to a communications network via its communication circuitry, the first apparatus further comprising computer-executable instructions stored in the memory of the first apparatus which, when executed by the processor of the first apparatus, cause the first apparatus to:
receive, from a second apparatus, a first configuration, the first configuration pertaining to measurements of a first set of beams in one or more cells,
wherein the first configuration comprises a measurement type for beam measurements, a maximum number of beams and a first threshold for a beam-specific measurement result, a second threshold for a cell-specific measurement result, parameters for layer 3 (L3) filtering, measurement reporting criterion,
wherein the measurement type indicates the beam measurements should be performed based on a synchronization signal (SS) block or channel state information reference signal (CSI-RS),
wherein the parameters for L3 filtering include a parameter of a L3 filtering coefficient to be used in a L3 beam filtering and a L3 cell filtering, the L3 beam filtering being applied to the first set of beams and the L3 cell filtering being applied to a second set of beams extracted from the first set of beams based on the maximum number of beams and the threshold for beam-specific measurements, and
wherein the second threshold corresponds to a quality threshold of a primary cell to determine if a measurement on other cells is required; and
receive, from the second apparatus, the SS block or CSI-RS to perform the beam measurements based on the first configuration; and
transmit, to the second apparatus, a measurement report including a cell-specific measurement result of a first cell, the first cell being selected based on the second threshold after the L3 cell filtering.
2. The first apparatus of claim 1 , wherein the second threshold is based on a reference signal received power for the primary cell.
3. The first apparatus of claim 2 , wherein the second threshold comprises a SS block-based threshold and a CSI-RS based threshold.
4. The first apparatus of claim 1 , wherein the measurement report further includes a beam-specific measurement result generated based on the L3 beam filtering.
5. The first apparatus of claim 1 , wherein the first configuration further comprises a reporting criterion indicating a plurality of trigger events including a trigger event that an average value or weighted sum of trigger quantity of beams of the primary cell becomes worse than a third threshold.
6. The first apparatus of claim 5 , wherein the plurality of trigger events further includes an trigger event that an average value or weighted sum of trigger quantity of beams of a neighbor cell becomes offset better than the primary cell.
7. The first apparatus of claim 1 , wherein the L3 filtering coefficient is a parameter k used in: F n =(1−a)·F n-1 +a·M n .
8. A second apparatus comprising a processor, a memory, and communication circuitry, the second apparatus being capable of connecting to a communications network via its communication circuitry, the second apparatus further comprising computer-executable instructions stored in the memory of the second apparatus which, when executed by the processor of the second apparatus, cause the second apparatus to:
transmit, to a first apparatus, a first configuration, the first configuration pertaining to measurements of a first set of beams in one or more cells,
wherein the first configuration comprises a measurement type for beam measurements, a maximum number of beams and a first threshold for a beam-specific measurement result, a second threshold for a cell-specific measurement result, parameters for layer 3 (L3) filtering, measurement reporting criterion,
wherein the measurement type indicates the beam measurements should be performed based on a synchronization signal (SS) block or channel state information reference signal (CSI-RS),
wherein the parameters for L3 filtering include a parameter of a L3 filtering coefficient to be used in a L3 beam filtering and a L3 cell filtering, the L3 beam filtering being applied to the first set of beams and the L3 cell filtering being applied to a second set of beams extracted from the first set of beams based on the maximum number of beams and the threshold for beam-specific measurements, and
wherein the second threshold corresponds to a quality threshold of a primary cell to determine if a measurement on other cells is required;
transmit, to the first apparatus, the SS block or CSI-RS to perform the beam measurements based on the first configuration; and
receive, from the first apparatus, a measurement report including a cell-specific measurement result of a first cell, the first cell being selected based on the second threshold after the L3 cell filtering.
9. The second apparatus of claim 8 , wherein the second threshold is based on a reference signal received power for the primary cell.
10. The second apparatus of claim 9 , wherein the second threshold comprises a SS block-based threshold and a CSI-RS based threshold.
11. The second apparatus of claim 8 , wherein the measurement report further includes a beam-specific measurement result generated based on the L3 beam filtering.
12. The second apparatus of claim 8 , wherein the first configuration further comprises a reporting criterion indicating a plurality of trigger events including a trigger event that an average value or weighted sum of trigger quantity of beams of the primary cell becomes worse than a third threshold.
13. The second apparatus of claim 12 , wherein the plurality of trigger events further includes an trigger event that an average value or weighted sum of trigger quantity of beams of a neighbor cell becomes offset better than the primary cell.
14. The second apparatus of claim 8 , wherein the L3 filtering coefficient is a parameter k used in: F n =(1−a)·F n-1 +a·M n .
15. A method for network node, the method comprising:
transmitting, to a first apparatus, a first configuration, the first configuration pertaining to measurements of a first set of beams in one or more cells;
wherein the first configuration comprises a measurement type for beam measurements, a maximum number of beams and a first threshold for a beam-specific measurement result, a second threshold for a cell-specific measurement result, parameters for layer 3 (L3) filtering, measurement reporting criterion,
wherein the measurement type indicates the beam measurements should be performed based on a synchronization signal (SS) block or channel state information reference signal (CSI-RS),
wherein the parameters for L3 filtering include a parameter of a L3 filtering coefficient to be used in a L3 beam filtering and a L3 cell filtering, the L3 beam filtering being applied to the first set of beams and the L3 cell filtering being applied to a second set of beams extracted from the first set of beams based on the maximum number of beams and the threshold for beam-specific measurements, and
wherein the second threshold corresponds to a quality threshold of a primary cell to determine if a measurement on other cells is required;
transmitting, to the first apparatus, the SS block or CSI-RS to perform the beam measurements based on the first configuration; and
receiving, from the first apparatus, a measurement report including a cell-specific measurement result of a first cell, the first cell being selected based on the second threshold after the L3 cell filtering.
16. The first apparatus of claim 15 , wherein the second threshold is based on a reference signal received power for the primary cell.
17. The first apparatus of claim 16 , wherein the second threshold comprises a SS block-based threshold and a CSI-RS based threshold.
18. The first apparatus of claim 15 , wherein the measurement report further includes a beam-specific measurement result generated based on the L3 beam filtering.
19. The first apparatus of claim 15 , wherein the first configuration further comprises a reporting criterion indicating a plurality of trigger events including a trigger event that an average value or weighted sum of trigger quantity of beams of the primary cell becomes worse than a third threshold.
20. The first apparatus of claim 19 , wherein the plurality of trigger events further includes an trigger event that an average value or weighted sum of trigger quantity of beams of a neighbor cell becomes offset better than the primary cell.
21. The first apparatus of claim 15 , wherein the L3 filtering coefficient is a parameter used in: F n =(1−a)·F n-1 +a·M n .