Transmitter Beam Selection for PUCCH and PUSCH with Timing Rules
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Solution Overview
Problem
User equipment (UE) faces a challenge in determining which instance of control information to use for selecting a transmitter beam when multiple instances of control information applicable to the same uplink transmission are received, leading to ambiguity in beam selection.
Innovation Solution
The UE selects a transmitter beam based on either first control information received in a medium access control (MAC) control element (CE) or second control information received over a physical downlink control channel (PDCCH) within a predetermined duration, providing clear criteria for beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE receives multiple instances of control information for the same uplink transmission, then the UE has multiple transmitter beam options, but the UE cannot determine which control information to use for beam selection
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined duration window after ACK transmission and defining clear priority rules for selecting between first control information (from MAC CE) and second control information (from PDCCH). This preliminary framework enables the UE to automatically resolve beam selection ambiguity without requiring additional network coordination or complex real-time decision-making processes.
2Measurement precision
If the UE waits for network confirmation on which control information to use, then beam selection accuracy improves, but transmission delay increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine which control information to use for beam selection based on pre-configured rules and timing relationships. The UE independently evaluates the timing of received control information relative to the ACK transmission and applies the appropriate selection criterion without requiring additional network confirmation messages, thereby eliminating unnecessary delay while maintaining accurate beam selection.
3Ease of operation
If the UE uses the first control information from MAC CE, then beam selection is simplified, but the beam may not be optimal for current channel conditions
Solution Approach 1:
The patent applies dynamics by making the beam selection criterion time-dependent and condition-based. The UE dynamically selects between first control information (MAC CE) and second control information (PDCCH) based on when each was received relative to the ACK transmission and the predetermined duration window. This dynamic approach allows the system to adapt to current channel conditions while maintaining clear operational rules, balancing simplicity with optimality.
Data Source
AI summary
The exemplary embodiments relate to determining which instance of control information is to be used for transmitter beam selection. A user equipment may receive a medium access control (MAC) control element (CE) that includes first control information associated with transmitter beam selection, transmit an acknowledgement (ACK) to the network in response to receiving the MAC CE and receive a downlink signal over a physical downlink control channel (PDCCH) that schedules an uplink transmission. The downlink signal is received prior to an expiration of a predetermined duration relative to transmitting the ACK and includes second control information associated with transmitter beam selection. The UE may also transmit an uplink signal based on the scheduled uplink transmission. The UE selects a transmitter beam for the uplink signal based on one of the first control information or the second control information.