NRU UE Downlink Reception Control with DCI Cancellation Feedback
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Solution Overview
Problem
In new radio-based access to unlicensed spectrum (NRU), user equipment (UE) faces challenges in determining whether to receive or cancel configured downlink transmissions due to uncertainties in the base station's transmission plans, and there is a need for methods to confirm or cancel these transmissions based on specific conditions.
Innovation Solution
The UE is equipped with a processor and transceiver to receive or cancel downlink transmissions based on conditions met by detecting downlink control information (DCI) formats, channel occupancy duration, and resource block availability, using parameters like DCI format 2_0, tdd-UL-DL-ConfigurationCommon, and higher layer parameters to validate or invalidate downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station shares channel occupancy time with the UE for uplink transmission, then the UE can obtain the channel with greater probability using higher priority LBT mode, but the UE faces uncertainty whether the base station will actually transmit the configured downlink transmission or cancel it due to prioritizing other services
Solution Approach 1:
The base station provides feedback information to the UE through DCI format 2_0 to indicate whether the configured downlink transmission will be cancelled. This feedback mechanism allows the UE to know in advance whether to proceed with reception or cancel it, resolving the uncertainty caused by the base station prioritizing other services while maintaining the shared channel occupancy time arrangement.
2Reliability
If the UE monitors multiple conditions (DCI format detection, channel occupancy duration, RB set availability) to determine whether to receive downlink transmission, then the transmission reliability is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The base station performs preliminary actions by detecting DCI format 2_0 and determining channel occupancy duration and RB set availability before the actual downlink transmission. This allows the UE to be informed in advance about the transmission status through predefined conditions, enabling the UE to make reception decisions without complex real-time analysis, thus reducing UE processing complexity while maintaining high reliability.
3Adaptability or versatility
If the base station cancels configured downlink transmission to prioritize other services, then the service prioritization flexibility is improved, but the UE cannot confirm whether the transmission will occur and must potentially waste resources preparing for reception
Solution Approach 1:
The base station performs preliminary determination of service priorities and transmission cancellation decisions before the configured downlink transmission time. By detecting DCI format 2_0 and evaluating channel occupancy conditions in advance, the base station can notify the UE of the transmission status beforehand, allowing the UE to cancel reception preparation if cancellation is indicated, thus avoiding wasted resource preparation time while maintaining service prioritization flexibility.
Data Source
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AI summary
An apparatus and a method of communication of the same are provided. A method of communication of a user equipment (HE) includes being configured, by a base station, to receive a downlink transmission on a set of symbols m a slot and a set of resource blocks (RBs) and receiving the configured downlink transmission on the set of symbols in the slot and on the set of RBs, or otherwise canceling reception of the configured downlink transmission on the set of symbols in the slot and on the set of RBs. This can solve issues in the prior art and provide a method of receiving a configured downlink transmission on a set of symbols in a slot and a set of resource blocks (RBs) or otherwise canceling reception of the configured downlink transmission on the set of symbols in the slot and on the set of RBs.