Uplink Cancellation Indication for Dynamic Resource Reallocation
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Solution Overview
Problem
Current wireless communication systems face challenges in managing full-duplex communications, particularly in self-interference and resource allocation, where existing methods fail to efficiently cancel uplink transmissions to prioritize higher priority data or adjust to changing network traffic needs.
Innovation Solution
The implementation of a mechanism where a base station can transmit a configured grant to a user equipment (UE) indicating resources for uplink communication, and subsequently transmit a downlink control information (DCI) with an uplink cancellation indication to allow another UE with higher priority data to transmit by canceling the original UE's transmission in full-UL or full-duplex slots based on specific parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a base station transmits configured grant resources to a UE for uplink communication, then the UE can transmit uplink data, but another UE with higher priority data cannot be scheduled in those resources
Solution Approach 1:
The patent implements dynamic resource reallocation by enabling the base station to cancel previously allocated uplink resources through DCI signaling. The system transitions from static configured grant allocation to dynamic on-demand allocation, allowing resources to be reassigned to higher priority UEs when needed, thus resolving the contradiction between guaranteed transmission and network flexibility.
Solution Approach 2:
The patent changes the state of resource allocation parameters by introducing cancellation indicators in DCI messages. When a base station needs to reallocate resources, it transmits a cancellation indication that modifies the allocation status from active to cancelled, enabling flexible resource management while maintaining the configured grant framework.
2Reliability
If the base station cancels uplink transmission resources dynamically, then higher priority data can be transmitted, but the original UE's transmission is interrupted
Solution Approach 1:
The base station performs preliminary actions by pre-configuring multiple uplink resources for a UE through configured grant signaling. However, the actual transmission can be cancelled at any time before execution through DCI cancellation indications. This allows the system to prepare resources in advance while maintaining the ability to interrupt and reallocate them to higher priority needs, balancing reliability with latency considerations.
3Productivity
If full-duplex slots are used for simultaneous uplink and downlink communication, then spectral efficiency is improved, but self-interference management becomes more difficult
Solution Approach 1:
The patent segments the full-duplex slot into distinct uplink and downlink time portions, allowing simultaneous frequency-domain communication while managing self-interference through temporal separation. The configured grant resources are allocated to specific time segments within the slot, enabling the base station to control which portion receives which type of transmission, thereby reducing self-interference while maintaining spectral efficiency.
Data Source
AI summary
Wireless communications systems and methods related to applying an uplink (UL) cancellation indication are provided. A UE may receive downlink control information (DCI) from a base station (BS). The DCI may include an uplink (UL) cancellation indication that references a plurality of resources in one or more full-UL slots and one or more full-duplex slots. The UE may refrain, based on the UL cancellation indication, from transmitting a communication in at least one of a first resource of the plurality of resources in the one or more full-UL slots or a second resource of the plurality of resources in the one or more full-duplex slots. Other aspects and features are also described.