Contiguous Uplink Transmission via Prechecked LBT Opportunities
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Solution Overview
Problem
Existing wireless communication technologies in contention-based access systems face challenges in ensuring effective uplink transmission due to limitations in resource reservation and interference management, particularly in scenarios where listen-before-talk (LBT) procedures are not successful within a threshold quantity of transmission opportunities.
Innovation Solution
Implementing a method where user equipment (UE) performs listen-before-talk (LBT) procedures up to a threshold quantity of transmission opportunities and selectively transmits repetitions of uplink transmissions or determines a failure based on the success of these procedures, enabling improved resource reservation and coverage for physical uplink control channel (PUCCH), sounding reference signal (SRS), and positioning reference signal (PRS) communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT procedure is performed for multiple transmission opportunities to improve uplink transmission reliability, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The system performs LBT procedures in advance for multiple transmission opportunities (TOs) within a channel occupancy time (COT) before actual uplink transmission. By pre-establishing the LBT success status for each TO, the system prepares transmission opportunities ahead of time, allowing the UE to transmit immediately when a TO becomes available without performing LBT at the moment of transmission, thus reducing transmission delay while maintaining reliability through multiple pre-checked opportunities
2Object-affected harmful factors
If LBT procedure is performed for each transmission opportunity to avoid interference, then interference management is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The base station performs LBT procedures in advance for multiple transmission opportunities within a COT and notifies the UE of the LBT success status for each TO. This preliminary action allows the system to identify all available transmission opportunities before actual data transmission, enabling the UE to efficiently utilize all successful TOs without performing individual LBT checks at transmission time, thus improving resource utilization while maintaining interference avoidance
Solution Approach 2:
The system establishes a continuous channel occupancy time (COT) that contains multiple transmission opportunities, allowing uplink transmissions to proceed continuously across multiple TOs without interruption. By maintaining the COT structure and pre-determining LBT success for each TO within the continuous period, the system ensures continuous useful transmission action while avoiding the need to re-perform LBT between individual transmissions, thereby improving resource utilization efficiency
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may attempt, for up to a threshold quantity of transmission opportunities of a plurality of transmission opportunities of a channel occupancy time in a transmission opportunity aggregation deployment, a listen-before-talk (LBT) procedure; and selectively transmit, based at least in part on the LBT procedure being successful within the threshold quantity of transmission opportunities, one or more repetitions of an uplink transmission in one or more remaining transmission opportunities of the plurality of transmission opportunities, or determine, based at least in part on the LBT procedure not being successful within the threshold quantity of transmission opportunities, that a failure of the uplink transmission has occurred. Numerous other aspects are provided.