This non-provisional application claims priority under 35 U.S.C. ยง 119(a) on Patent Application No(s). 108117741 filed in Republic of China on May 22, 2019, the entire contents of which are hereby incorporated by reference.
This disclosure relates to a method for controlling a discontinuous reception in a dual connectivity mode and a communication node thereof.
A user equipment (UE) with dual connectivity (DC) capability can be dual-connected with two base stations to form a dual connectivity architecture, which is called as multi-radio dual connectivity (MR-DC). In this situation, one of the base stations (or evolved node B) becomes a master communication node, and the other base station becomes a secondary communication node, and the master communication node has the responsibility to communicate with the UE and coordinate the UE's radio resources with the secondary communication node through a X2 interface
In the dual connectivity mode, the UE only has signaling connection with the master communication node through a radio resource control (RRC), but it has data connection with the master communication node and the secondary communication node. The contents maintained by the RRC connection are related to the radio resources configured to the UE and how the UE uses the radio resources. In a radio bearer (RB) which is used to transmit data, Data radio bearer (DRB) is used to transmit the user's network packet, and signaling radio bearer (SRB) is used to transmit control information of RRC sublayer. With regard to the standard RRC information used to control various radio resource configurations, wherein the radio resource configuration parameter included in the RRC Connection RE configuration procedure includes a discontinuous reception configuration (DRX-Config) field. Discontinuous reception (DRX) is a scheme used in communication networks to conserve battery energy of receiving devices.
It is a research topic to conceive a synergistic operation mechanism for the communication environment with relatively complete infrastructure in the dual connectivity mode.
Accordingly, this disclosure provides a method for controlling a discontinuous reception in a dual connectivity mode and a communication node thereof.
According to one or more embodiment of this disclosure, a method for controlling a discontinuous reception (DRX) in a dual connectivity mode is provided, and the method comprises: configuring, by a first communication node, a user equipment (UE) that supports a dual connectivity to measure a channel quality of the first communication node and a channel quality of a second communication node; configuring, by the first communication node, the UE to enter or leave the DRX on the first communication node, according to the channel qualities of the first and the second communication nodes which feedbacks from the UE; and configuring, by the first communication node, the UE to transmit/receive at least one data radio bearer (DRB) through a leg of the second communication node or transmit/receive the DRB through both of a leg of the first communication node and the leg of the second communication node, according to the channel qualities of the first and the second communication nodes.
According to one or more embodiment of this disclosure, a communication node is provided and the communication node comprises a processor coupled to a transceiver for communicating with the user equipment (UE) that supports the dual connectivity, wherein the processor is configured to control the discontinuous reception (DRX) of the UE on the communication node. The processor configures the UE to measure a channel quality of the communication node and a channel quality of a second communication node. The processor configures the UE to enter or leave the DRX according to the channel quality of the communication node and the channel quality of the second communication node which feedbacks from the UE. The processor configures the UE to transmit/receive at least one data radio bearer (DRB) through a leg of the second communication node or transmit/receive the DRB through both of a leg of the communication node and the leg of the second communication node according to the channel quality of the communication node and the channel quality of the second communication node.
The present disclosure will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only and thus are not limitative of the present disclosure and wherein:
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawings.
Multi-Radio Dual Connectivity can have multiple different types. For example, communication nodes with the same technical category or different technical categories can be selected as a primary communication node and a secondary communication node. For example, the primary communication node can be an LTE communication node, the secondary communication node can be a 5G New Radio (NR) communication node, and the primary communication node and the secondary communication node form a NR-to-NR Dual Connectivity (NR-DC). For example, the primary communication node can be a Long Term Evolution (LTE) (or called as Evolved Universal Terrestrial Radio Access (E-UTRA)) communication node, the secondary communication node can be an NR communication node, and the primary communication node and the secondary communication node form a LTE-to-NR Dual Connectivity (EN- DC).
In accordance with the present disclosure, a method for controlling a discontinuous reception in a dual connectivity mode and a communication node for operating this method are provided, which can be utilized to control a user equipment (UE) to enter or leave a discontinuous reception (DRX) scheme on a primary communication node, or to adjust the cycle of the DRX of the UE on the primary communication node, and adjust the receiving/sending data path of the UE according to a communication environment of the UE configured by the primary communication node for reducing a power consumption of the primary communication node. In the Radio Resource Control (RRC) information between the primary communication node and the UE, a timer can be set in a discontinuous reception configuration (DRX-Config) field of radio resource configuration parameters included in the RRC Connection RE configuration procedure, the cycle of the DRX can be set, and a subframe (sf) is used as a unit for setting the cycle of the DRX, wherein the time through one subframe is 1 ms. For example, if one DRX is set as 2560 subframes, and 2560 ms is equal to 2.56 seconds.
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In one embodiment of the communication system 100, when the first communication node 101 configures the user equipment to measure the channel quality of the first communication node 101 and the channel quality of the second communication node 102, the first communication node 101 also configures the dual connectivity of the user equipment and the split radio bearer of the user equipment. In an initial state, the first communication node 101 may configure the UE to leave the DRX or enter a short DRX cycle of the DRX and configure the UE to transmit/receive the DRB through both of legs of the first and the second communication nodes 101 and 102. Thereafter, the first communication node 101 will maintain the UE's original state or transform the UE's state to a different state according to the channel qualities of the first and the second communication nodes 101 and 102 which feedbacks from the UE.
For example, in one embodiment, the first communication node 101 configures the user equipment 103-1 to enter the discontinuous reception when the channel qualities of the first and the second communication nodes 101 and 102 measured by the user equipment 103-1 in
For example, in another embodiment, the first communication node 101 configures the user equipment 103-2 to enter the discontinuous reception when the channel quality of the first communication node 101 measured by the user equipment 103-2 in
For example, in another embodiment, the first communication node 101 configures the user equipment 103-3 to enter a short discontinuous reception cycle of the discontinuous reception or leave the discontinuous reception when the channel qualities of the first and the second communication nodes 101 and 102 measured by the user equipment 103-3 in
For example, in another embodiment, the first communication node 101 configures the user equipment 103-4 to enter the discontinuous reception when the channel quality of the first communication node 101 measured by the user equipment 103-4 in
For example, in another embodiment, the first communication node 101 configures the user equipment 103-4 to enter the short discontinuous reception cycle or leave the discontinuous reception when the channel quality of the first communication node 101 measured by the user equipment 103-4 in
As shown in FIG.4, Step 41 is configuring, by the first communication node 101, the user equipment 103 that supports the dual connectivity to measure the channel quality of the first communication node 101 and the channel quality of the second communication node 102, and Step 43 is configuring, by the first communication node 101, the UE 103 to control the DRX on the first communication node 101, according to the channel qualities of the first and the second communication nodes 101 and 102 which feedbacks from the UE 103, and Step 45 is configuring, by the first communication node 101, the UE 103 to transmit/receive the at least one data radio bearer (DRB) through the leg of the second communication node 102 or transmit/receive the at least one DRB through both of the leg of the first communication node 101 and the leg of the second communication node 102 according to the channel qualities of the first and the second communication nodes 101 and 102. In another embodiment, Step 44 is configuring the UE 103 to control the DRX on the first communication node 101 further according to whether the UE 103 is configured with a split signaling radio bearer (SRB).
The flowcharts of performing conversion setting between different states according to embodiments of the present disclosure are illustrated as follows. Please refer to an embodiment shown in FIG.5a, Step 451 is configuring, by the first communication node, the UE to enter the long DRX cycle of the DRX, when the channel quality of the first communication node is higher than the first up-threshold, and Step 453 is configuring, by the first communication node, the UE to transmit/receive the at least one data radio bearer (DRB) through the leg of the second communication node when the channel quality of the second communication node is higher than the second up-threshold, and Step 455 is configuring, by the first communication node, the UE to transmit/receive the DRB through both of the legs of the first and the second communication nodes when the channel quality of the second communication node is lower than the second low-threshold.
Please refer to an embodiment shown in FIG.5b, Step 452 is configuring, by the first communication node, the UE to enter the short DRX cycle of the DRX or leave the DRX, when the channel quality of the first communication node is lower than the first low-threshold and the channel quality of the second communication node is lower than the second low-threshold, and Step 454 is configuring, by the first communication node, the UE to transmit/receive the at least one DRB through both of the legs of the first and the second communication nodes.
Please refer to an embodiment shown in FIG.5c, Step 456 is configuring, by the first communication node, the UE to enter the long DRX cycle of the DRX, when the channel quality of the first communication node is lower than the first low-threshold, the channel quality of the second communication node is higher than the second up-threshold and the UE is configured with the split SRB, and Step 458 is configuring, by the first communication node, the UE to transmit/receive the at least one data radio bearer (DRB) through the leg of the second communication node.
Please refer to an embodiment shown in
The foregoing method for controlling the discontinuous reception in dual connectivity and the communication node for operating the method according to the present disclosure, which can control the user equipment (UE) to enter or leave the discontinuous reception (DRX) on the primary communication node, or to adjust the cycle of the DRX of the UE on the primary communication node, and adjust the receiving/ sending data path of the UE according to the communication environment of the UE configured by the primary communication node for reducing the power consumption of the primary communication node.
Number | Date | Country | Kind |
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108117741 | May 2019 | TW | national |