Uplink Cancellation Indication for Interlaced PUSCH Resources
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in communicating uplink cancellation indications, particularly in unlicensed spectrum, where interlaced uplink resources complicate the cancellation process, leading to increased signaling overhead and limitations in resource allocation flexibility.
Innovation Solution
A new cancellation indication method is introduced, using a smaller resource indicator value to efficiently communicate cancelled frequency information for interlaced Physical Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH) resources, allowing for dynamic allocation changes and interference reduction by cancelling resources on a per-slot basis, and extending cancellation to include Physical Random Access Channel (PRACH) transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional cancellation indication methods are used for interlaced uplink resources, then resource allocation can be controlled, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential cancellation information needed for interlaced resources by using a compact resource indicator value (RIV) format. Instead of signaling complete resource descriptions, the system extracts and transmits only the critical parameters (interlace index and resource offset) that define the cancelled resources, thereby reducing signaling overhead while maintaining allocation flexibility.
Solution Approach 2:
The patent changes the parameter representation method by introducing a specialized RIV encoding scheme tailored for interlaced resources. The cancellation indication uses modified parameters (interlace index combined with resource offset) rather than traditional resource block indicators, allowing efficient representation of cancelled resources with fewer bits while preserving the ability to flexibly allocate and cancel specific interlaced resource portions.
2Measurement precision
If detailed cancellation information is transmitted for each resource, then resource allocation precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal RIV encoding mechanism that handles both interlaced and non-interlaced resource cancellations through a unified framework. The same cancellation indication structure and processing logic can indicate different resource types by varying the interlace index parameter, eliminating the need for separate processing paths and reducing device complexity while maintaining precise resource indication capability.
3Ease of operation
If cancellation indication uses standard resource allocation format, then compatibility is maintained, but efficiency in unlicensed spectrum decreases
Solution Approach 1:
The patent segments the uplink resources into distinct interlaces, each identifiable by an interlace index. The cancellation indication leverages this segmentation by using the interlace index combined with a resource offset to precisely identify cancelled resources within specific interlaces. This segmented approach improves efficiency in unlicensed spectrum by enabling targeted cancellation of only the necessary interlaced resources rather than using broad, less efficient standard allocation formats.
Data Source
AI summary
A user equipment has been allocated uplink resources, e.g. interlaced uplink channel resources, e.g. interlaced physical uplink shared channel (PUSCH) resources, and non-interlaced uplink channel resources. The UE receives cancellation indication (CI) information which rescinds the allocation for a portion of the previous granted resources. CI is communicated using different formats for resources which are in blocks and resources which are interlaced. The CI for the interlaced resources uses a more efficient format with less overhead to communicate frequency information corresponding to the cancellation for the interlaced channel.