Base station device, user equipment device, and RS configuration control method performed in each device
Provided are method and devices which apply an optimal DMRS configuration for each slot unit to which a DMRS is allocated, and guarantee both resources for data transmission of a PDSCH/PUSCH and stability of transmission or reception based on the accuracy of channel estimation in balance, thereby increasing transmission quality and throughput.
1 . A base station device comprising:
a candidate selecting unit configured to select a candidate reference signal (RS) configuration based on a transmission environment associated with a user equipment (UE); and
a configuration controller configured to apply the candidate RS configuration to at least one of slots to which a predetermined RS configuration for the UE is applied, and determine an optimal RS configuration between the predetermined RS configuration for the UE and the candidate RS configuration,
wherein, in response to determination that the candidate RS configuration is the optimal RS configuration, the configuration controller applies the candidate RS configuration by changing RS configurations applied to remaining slots excluding a predetermined slot from slots for the RS transmission to the UE, to the candidate RS configuration.
2 . The base station device of claim 1 , wherein the RS is a demodulate reference signal (DMRS) used for channel estimation for demodulating data transmitted in at least one of a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUDSCH).
3 . The base station device of claim 1 , wherein the at least one of slots is selected from the slots to which the predetermined RS configuration is applied based on a pattern for each of the slots.
4 . The base station device of claim 1 , wherein the configuration controller compares data transmission performance between a slot to which the predetermined RS configuration is applied and a slot to which the candidate RS configuration is applied during a predetermined monitoring period (MonitoringPeriod), and determines the optimal RS configuration based on a comparison result.
5 . The base station device of claim 1 , wherein the predetermined slot is set based on a pattern for each of slots to maintain a default RS configuration with respect to slots for the RS transmission to the UE.
6 . The base station device of claim 5 , wherein the configuration controller compares data transmission performance between the predetermined slot and the remaining slots, and applies the default RS configuration to all slots for the RS transmission to the UE when the performance of the predetermined slot is better.
7 . The base station device of claim 1 , wherein the transmission environment associated with the UE is based on at least one of an amount of transmission data, a movement speed of the UE, and a success rate of data transmission, and wherein the candidate selecting unit selects, as the candidate RS configuration, an RS configuration having a larger number of symbols of the RS transmitted in a slot than that of the predetermined RS configuration for the UE when the amount of transmission data is smaller than a preset value, the movement speed of the UE is faster than a preset value or the success rate of data transmission is lower than a preset value.
8 . A user equipment (UE) device comprising:
a configuration identifying unit configured to identify, from downlink control information (DCI) transferred from a base station for scheduling, a reference signal (RS) configuration for transmission of the RS; and
a controller configured to process the RS by applying the identified RS configuration in a case of a downlink and an uplink,
wherein the RS configuration for each of remaining slots excluding a predetermined slot for slots for the RS transmission to the UE is an optimal RS configuration determined by the base station, and
wherein the base station selects a candidate RS configuration based on a transmission environment associated with the UE, applies the candidate RS configuration to at least one of slots to which a predetermined RS configuration for the UE is applied, and determines the optimal RS configuration between the predetermined RS configuration and the candidate RS configuration.
9 . The UE device of claim 8 , wherein the RS is a demodulate reference signal (DMRS) used for channel estimation for demodulating data transmitted in at least one of a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUDSCH).
10 . The UE device of claim 8 , wherein the optimal RS configuration is determined via an optimal RS configuration determining procedure performed by the base station.
11 . A reference signal (RS) configuration control method performed by a base station device, the method comprising:
selecting a candidate RS configuration based on a transmission environment associated with a user equipment (UE);
performing a procedure of applying the candidate RS configuration to at least one of slots to which a predetermined RS configuration for the UE is applied, and determining an optimal RS configuration between the predetermined RS configuration for the UE and the candidate RS configuration; and
applying, in response to determination that the candidate RS configuration is an optimal RS configuration, the candidate RS configuration by changing RS configurations applied to remaining slot excluding a predetermined slot from slots for the RS transmission to the UE to the candidate RS configuration.
12 . The method of claim 11 , wherein the at least one of slots is selected from the slots to which the predetermined RS configuration is applied based on a pattern for each of the slots.
13 . The method of claim 11 , wherein the procedure of determining the optimal RS configuration comprises comparing data transmission performance between a slot to which the predetermined RS configuration is applied and a slot to which the candidate RS configuration is applied during a predetermined monitoring period (MonitoringPeriod), and determining an optimal RS configuration based on a comparison result.
14 . The method of claim 11 , wherein the predetermined slot is a slot set based on a pattern for each of slots to maintain a default RS configuration with respect to slots for the RS transmission to the UE.
15 . A reference signal (RS) configuration control method performed by a user equipment (UE) device, the method comprising:
identifying, from downlink control information (DCI) transferred from a base station for scheduling, a RS configuration for RS transmission; and
controlling the RS by applying the identified RS configuration in a case of a downlink and an uplink,
wherein the RS configuration for each of remaining slots excluding a predetermined slot from slots for the RS transmission to the UE is an optimal RS configuration determined by the base station, and
wherein the base station selects a candidate RS configuration based on a transmission environment associated with the UE, applies the candidate RS configuration to at least one of slots to which a predetermined RS configuration for the UE is applied, and determines the optimal RS configuration between the predetermined RS configuration and the candidate RS configuration.