Multi-TxOP Scheduling for PUSCH Coverage in Shared Spectrum
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Solution Overview
Problem
In wireless communication systems, particularly in shared or unlicensed radio frequency spectrum, the intermittent availability of carriers due to contention between devices leads to inefficient scheduling, resulting in reduced throughput and limited physical uplink shared channel (PUSCH) coverage.
Innovation Solution
Implementing multi-transmission opportunity (TxOP) scheduling, where the number of repetitions of uplink information is indicated in the uplink grant, with transport block scaling (TBS) and dense reference signals to enhance coverage, and using listen-before-talk (LBT) procedures to manage channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport block scaling (TBS) is used with a single interlace, then the transmission power is fully utilized, but the coverage enhancement is insufficient
Solution Approach 1:
The patent segments the single interlace transmission into multiple interlaced waveforms transmitted across multiple transmission opportunities (TxOPs). Each waveform carries a portion of the transport block, and the segments are combined at the receiver to achieve both coverage enhancement through repetition and maintain throughput by efficiently utilizing available spectrum resources across multiple opportunistic transmissions.
2Adaptability or versatility
If carriers in shared spectrum are accessed intermittently due to contention, then the availability of resources is reduced, but the scheduling complexity increases
Solution Approach 1:
The patent implements dynamic scheduling that adapts to the intermittent availability of shared spectrum carriers. The system dynamically selects transmission opportunities based on channel access success, adjusts the number of repetitions based on channel conditions, and flexibly allocates resources across multiple TxOPs. This dynamic approach maintains adaptability to changing spectrum availability while reducing scheduling complexity through opportunistic transmission rather than complex predetermined scheduling.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an uplink grant that conveys an indication of a multi-transmission opportunity (TxOP) grant. The UE may transmit, during a first TxOP, a first uplink transmission in one or more subframes in accordance with the multi-TxOP grant. The UE may transmit, during a second TxOP, a second uplink transmission in one or more subframes in accordance with the multi-TxOP grant.