Semi-Static Scheduling Overwrite Handling in Full-Duplex Wireless
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Solution Overview
Problem
Wireless communication systems face challenges in managing scenarios where a scheduling occasion is overwritten, leading to unnecessary cancellation of uplink transmissions and increased transmission latency, especially in full-duplex communication scenarios.
Innovation Solution
Implementing techniques that allow user equipment (UE) to either drop or continue uplink transmissions when a subset of configured grant symbols is overwritten to be downlink symbols, using full-duplex communication to simultaneously transmit and receive data, thereby reducing latency and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-static scheduling configuration is used to allocate uplink transmission opportunities, then resource allocation efficiency is improved, but transmission latency increases when scheduling occasions are overwritten
Solution Approach 1:
The patent implements dynamic handling of overwritten scheduling occasions by allowing the UE to determine whether to cancel or retain uplink transmissions based on real-time conditions. The UE dynamically adjusts its behavior when CG symbols are overwritten by downlink symbols, choosing to maintain transmission if full-duplex capability is available and conditions permit, thereby reducing latency while preserving the benefits of semi-static scheduling.
Solution Approach 2:
The patent changes the state of scheduling occasions from fixed to flexible by introducing overwrite mechanisms that can transform CG symbols into downlink symbols based on dynamic scheduling needs. This parameter change allows the system to adapt to varying traffic conditions and optimize resource utilization while managing latency through intelligent decision-making at the UE.
2Reliability
If scheduled uplink transmissions are cancelled when scheduling occasion is overwritten, then downlink transmission priority is improved, but overall system efficiency deteriorates
Solution Approach 1:
The patent applies partial action by selectively cancelling uplink transmissions only when necessary and beneficial, rather than universally cancelling all overwritten transmissions. The UE evaluates specific conditions (such as full-duplex capability and transmission importance) to determine whether to retain or cancel uplink transmissions, thereby maintaining downlink priority when needed while preserving system efficiency in other cases.
Solution Approach 2:
The UE autonomously makes decisions about whether to cancel or retain uplink transmissions based on local conditions and capabilities. This self-service approach allows the UE to optimize its own transmission strategy without requiring centralized control, balancing downlink priority requirements with system efficiency goals based on real-time operational context.
3Loss of time
If full-duplex communication is implemented to allow simultaneous uplink and downlink transmissions, then transmission latency is reduced, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring full-duplex capability and related parameters in advance during system setup and operation. The UE and base station pre-establish the necessary configurations, capabilities, and decision criteria for full-duplex operation, enabling low-latency simultaneous transmissions when needed without requiring complex real-time computation or configuration adjustments during active communication.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for communicating uplink and downlink transmissions when a semi-statically configured scheduling occasion is overwritten by a slot format indicator. A method performed by a user equipment (UE) includes receiving a control message from a base station (BS) activating a semi-static scheduling configuration, wherein the semi-static scheduling configuration indicates a plurality of configured grant (CG) symbols in which the UE is scheduled to transmit at least one uplink transmission to the BS. The method may further include receiving, from the BS, a slot format indicator (SFI) that overwrites a subset of CG symbols of the plurality of CG symbols to be downlink symbols, and taking one or more actions to communicate at least one downlink transmission in the downlink symbols.