Transmission Occasion Group Timing for Wireless Gap Collisions
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Solution Overview
Problem
In wireless communications systems, contention-based transmission occasion groups face issues due to transmission gaps caused by overlapping resources or uplink gaps in half-duplex UEs, leading to collisions and disrupted reception of RACH messages or early data transmissions.
Innovation Solution
The solution involves configuring transmission occasions (TOs) with start times adjusted to account for transmission gaps, using periodicity and offsets to ensure successful transmissions, and allowing for puncturing or postponing data transmissions during gaps, ensuring alignment and reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission occasions are configured with fixed start times, then scheduling simplicity is improved, but transmission reliability deteriorates due to collisions from transmission gaps
Solution Approach 1:
The patent applies dynamics by making the start time of transmission occasions flexible rather than fixed. When a transmission gap is detected in a prior TO, the start time of the current TO is dynamically postponed. This resolves the contradiction by maintaining scheduling simplicity through a rule-based approach while improving transmission reliability by adapting to actual transmission conditions.
Solution Approach 2:
The patent changes the time parameter of transmission occasions based on detected transmission gaps. By modifying the start time parameter dynamically, the system maintains operational simplicity through parameter adjustment while ensuring reliable transmission by avoiding collisions caused by transmission gaps.
2Reliability
If transmission occasions are postponed to avoid gaps, then transmission reliability is improved, but time efficiency deteriorates
Solution Approach 1:
The patent applies partial action by postponing transmission occasions only when necessary (when transmission gaps are detected) rather than always postponing. This selective approach improves transmission reliability by avoiding collisions only when needed, while minimizing time loss by maintaining normal scheduling when no gaps are present.
3Productivity
If resources are shared among multiple UEs for contention-based transmissions, then resource utilization is improved, but collision probability increases
Solution Approach 1:
The patent implements feedback by monitoring for transmission gaps in prior transmission occasions and using this information to adjust the start time of current transmission occasions. This feedback mechanism allows multiple UEs to share resources effectively while reducing collisions, as each UE adapts its transmission timing based on observed gap patterns.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for a group of transmission occasions (TOs) that includes two or more TOs, each TO in the group of TOs including a set of resources shared by one or more UEs for contention-based data or access signal transmissions. The UE may perform at least one data or access signal transmission in a first TO in the group of TOs using a resource from the set of resources. The start time of the first TO may be in accordance with the presence of a transmission gap in a prior TO of the group of TOs. For example, a transmission gap may be caused by the presence of an overlapping narrowband physical random access channel resource or an uplink gap for UEs to synchronize timing with downlink communications.