Uplink Transmission Cancellation via Scaled Reference Resource
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently multiplexing and canceling multiple overlapping uplink transmissions for user equipment (UE), particularly in New Radio (NR) systems where timing advance and subcarrier spacing variations complicate resource alignment.
Innovation Solution
The proposed solution involves a UE receiving an indication of a parameter 'd' to determine the start of a reference uplink resource (RUR), which is scaled based on the subcarrier spacing of the uplink transmission. This allows the UE to accurately identify the starting symbol of the RUR, even when different subcarrier spacings are involved, and to cancel overlapping transmissions efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple uplink transmissions are multiplexed with different subcarrier spacings, then communication flexibility and adaptability are improved, but timing alignment and resource coordination become more complex
Solution Approach 1:
The patent introduces a reference uplink resource (RUR) concept with standardized parameters including reference subcarrier spacing and reference timing advance. By changing the parameter representation method - using scaled values relative to reference parameters - the system can handle multiple numerologies without increasing actual timing alignment complexity. The key formula n' = n × (Δν/Δν_ref) allows flexible adaptation to different subcarrier spacings while maintaining consistent timing relationships.
Solution Approach 2:
The reference uplink resource acts as an intermediary between different uplink transmissions with varying subcarrier spacings. Instead of directly coordinating each transmission pair, the system uses the RUR as a common reference point that mediates timing and frequency relationships. This intermediary approach simplifies the coordination mechanism by providing a universal reference frame for all transmissions.
2Measurement precision
If timing advance values are adjusted for each UE to compensate for propagation delay, then transmission synchronization is improved, but calculating and managing timing alignment across UEs with different numerologies becomes more difficult
Solution Approach 1:
The patent transforms the timing advance parameter from absolute time values to scaled values relative to a reference timing advance. The scaling relationship TA' = TA × (Δν/Δν_ref) allows the system to maintain precise timing synchronization while reducing management complexity. By expressing timing advances in terms of reference parameters, the system automatically adapts to different numerologies without requiring separate timing management mechanisms.
Solution Approach 2:
The reference uplink resource provides universal timing and frequency reference functionality for all UEs regardless of their numerology. Instead of creating separate reference mechanisms for each subcarrier spacing, the single RUR structure serves multiple functions: defining timing alignment, establishing frequency relationships, and enabling scaled parameter calculations for all UEs in the cell.
3Productivity
If the start of uplink transmission is dynamically determined, then scheduling flexibility is improved, but determining the exact starting symbol becomes more challenging with varying subcarrier spacings
Solution Approach 1:
The patent introduces scaled parameter representations for transmission timing. By defining starting symbols in terms of scaled values relative to the reference uplink resource, the system maintains scheduling flexibility while simplifying detection. The relationship n' = n × (Δν/Δν ref) allows dynamic scheduling decisions to be made in the reference frame and then accurately translated to the actual transmission timing for any numerology.
Data Source
AI summary
Various embodiments herein provide techniques for cancelation of one or more uplink (UL) transmissions from a user equipment (UE). The UE may receive an indication of a parameter d to use for determining a start of a reference UL resource (RUR). The parameter d may be UE-specific. The UE may further receive a physical downlink control channel (PDCCH) that includes a downlink control information (DCI) to indicate that a UL transmission is to be canceled in a RUR. The UE may determine a starting symbol of the RUR based on the parameter d. In embodiments, the UE may scale the parameter d based on a first subcarrier spacing (SCS) associated with the parameter d and a second SCS associated with the uplink transmission to obtain a scaled parameter d′ that is used to determine the starting symbol of the RUR. Other embodiments may be described and claimed.