Carrier Aggregation Uplink Access Signaling for Multi-PUSCH Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently facilitating communications on unlicensed spectrums in carrier aggregation scenarios, particularly in managing channel access procedures for multiple physical uplink shared channels (PUSCHs) to avoid excessive payload size overhead in DCI formats.
Innovation Solution
A UE and BS processor configure channel access procedures for multiple PUSCHs by determining channel access types, CAPC values, and CPE lengths based on DCI formats, allowing for flexible scheduling while reducing payload size overhead through shared indicators and predefined lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate channel access information is indicated for each PUSCH in multi-cell scheduling DCI, then channel access management flexibility is improved, but payload size overhead increases
Solution Approach 1:
The patent merges channel access information indication across multiple PUSCHs by introducing a representative PUSCH concept. Instead of indicating separate channel access parameters for each PUSCH, the system combines the indication into a single representative PUSCH (e.g., first PUSCH, last PUSCH, or PUSCH with largest transport block size). This merging approach reduces payload overhead while maintaining the ability to manage channel access for all scheduled PUSCHs through the representative indicator.
Solution Approach 2:
The patent applies universality by making the channel access information of a representative PUSCH applicable to multiple other PUSCHs. The indicated channel access type, CAPC value, and CPE length for the representative PUSCH are universally applied to a group of PUSCHs, allowing a single indication to serve multiple functions and reduce redundant signaling.
2Reliability
If channel access procedures are performed for each PUSCH independently, then channel access compliance is improved, but signaling complexity increases
Solution Approach 1:
The patent segments the set of scheduled PUSCHs into a representative PUSCH and other PUSCHs. The representative PUSCH receives explicit channel access information indication, while other PUSCHs inherit or derive their channel access parameters from the representative PUSCH. This segmentation allows independent channel access procedure performance for each PUSCH while reducing overall signaling complexity through the representative concept.
3Productivity
If CPE length is individually configured for each PUSCH, then transmission optimization is improved, but DCI payload size increases
Solution Approach 1:
The patent uses copying by having multiple PUSCHs copy the CPE length parameter from a representative PUSCH. Instead of individually configuring CPE length for each PUSCH, the system configures it once for the representative PUSCH and copies this value to other PUSCHs in the group. This maintains transmission optimization while significantly reducing DCI payload size by eliminating redundant CPE length indications.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for channel access related information indication in a carrier aggregation (CA) scenario. According to some embodiments of the disclosure, a UE may: receive, from a base station (BS), a downlink control information (DCI) format scheduling a plurality of physical uplink shared channels (PUSCHs) on a plurality of cells of the UE; determine a channel access type, a channel access priority class (CAPC) value and a cyclic prefix extension (CPE) length for each of the plurality of PUSCHs; perform a channel access procedure for each of the plurality of PUSCHs according to the determined channel access type and CAPC value; and transmit, to the BS, a CPE with duration equal to the determined CPE length for a first PUSCH of the plurality of PUSCHs and the first PUSCH in response to a corresponding channel access procedure for the first PUSCH being successful.