TDD Uplink Grant-Free Slot Selection for Downlink Conflict Avoidance
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Solution Overview
Problem
There is a lack of effective means for configuring uplink grant-free resources suitable for Time Division Duplexing (TDD) systems in wireless communication networks, particularly for extended reality (XR) applications, which face conflicts between multiple transmission occasions and downlink transmissions.
Innovation Solution
A method and apparatus for determining and configuring uplink grant-free resources in a TDD system by using uplink-downlink transmission configuration parameters to identify valid transmission slots, thereby resolving conflicts with downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission occasions are configured within a resource for XR data transmission, then the transmission capacity and reliability are improved, but conflicts with downlink transmissions occur in TDD systems
Solution Approach 1:
The patent segments the transmission resource by identifying and separating valid transmission slots from invalid ones based on uplink-downlink configuration parameters. The terminal device determines which slots are suitable for uplink transmission by checking against the TDD frame structure, thereby dividing the resource into usable and unusable portions to avoid downlink conflicts.
Solution Approach 2:
The patent implements dynamic slot determination where the terminal device adaptively identifies valid transmission slots based on the uplink-downlink transmission configuration parameter. The set of valid slots is not fixed but dynamically determined according to the TDD configuration, allowing the system to flexibly adapt to different TDD patterns while maintaining multiple transmission occasions.
2Productivity
If CG resources are configured for XR video frame transmission, then the full transmission capability is improved, but the adaptability to TDD frame structure is insufficient
Solution Approach 1:
The patent changes the parameter of slot validity by introducing the uplink-downlink transmission configuration parameter as a determining factor. The terminal device uses this parameter to identify which slots are valid for uplink transmission, thereby adapting the CG resource configuration to the TDD frame structure while maintaining the full transmission capability for XR video frames.
3Reliability
If transmission occasions are increased for reliable XR data delivery, then the transmission reliability is improved, but the resource conflict with downlink transmissions worsens
Solution Approach 1:
The patent applies preliminary action by having the terminal device determine valid transmission slots in advance before actual data transmission. By pre-identifying which slots are suitable for uplink transmission based on the TDD configuration, the system ensures reliable multi-occasion transmission while avoiding conflicts with downlink transmissions from the outset.
Data Source
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AI summary
Disclosed in the embodiments of the present disclosure are a method for determining an uplink grant-free resource, a method for configuring an uplink grant-free resource, and an apparatus, which may be applied to a time-division duplexing (TDD) system. The method for determining an uplink grant-free resource comprises: a terminal device acquiring at least one configured grant (CG) configuration; the terminal device determining uplink and downlink transmission configuration parameters, which are configured by a network device; and according to the uplink and downlink transmission configuration parameters, the terminal device determining at least one valid transmission slot of a CG resource corresponding to the at least one CG configuration, wherein one CG resource corresponds to one CG configuration. By means of implementing the embodiments of the present disclosure, at least one CG configuration may be supported in a TDD frame structure, and the problem of a conflict between the configuration of a plurality of transmission occasions in at least one resource and a downlink process may be solved.