Multi-Beam Uplink Channel Access in Shared Spectrum
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Solution Overview
Problem
Wireless communication systems face challenges in channel access for uplink transmissions over beams in shared spectra, particularly in efficiently identifying and utilizing multiple beams for effective communication.
Innovation Solution
A method where a wireless node receives a grant indicating multiple beams for channel access, performs channel access procedures over a subset of these beams, and transmits data based on successful completion, with the ability to select beams based on energy levels and resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedures are performed over multiple beams, then the reliability of uplink transmission is improved, but the complexity of channel access procedures increases
Solution Approach 1:
The channel access procedure is segmented by allowing different beams to independently perform channel access. Each beam can be granted separate resource allocations and perform channel access procedures autonomously, dividing the complex multi-beam channel access into manageable independent segments that improve reliability without overwhelming system complexity
Solution Approach 2:
The system allows performing channel access procedures over a subset of beams rather than requiring all beams to complete full channel access procedures. This partial action approach maintains reliability by ensuring at least some beams have successful channel access while reducing overall procedural complexity and overhead
2Productivity
If multiple beams are used for uplink transmission, then the communication efficiency is improved, but the resource management complexity increases
Solution Approach 1:
The grant structure is designed to be universal and multi-functional, capable of indicating resource allocations for multiple beams simultaneously through a single grant message. This allows the system to manage multiple beams efficiently without requiring separate complex resource management procedures for each beam, thereby improving communication efficiency while controlling resource management complexity
Solution Approach 2:
The base station performs preliminary action by pre-configuring and indicating multiple beam resource allocations in advance through grants. This allows the wireless device to know beforehand which beams have available resources, enabling efficient multi-beam transmission without requiring complex real-time resource management decisions during transmission
3Reliability
If channel access procedures are performed over all indicated beams, then the transmission reliability is improved, but the time consumption increases
Solution Approach 1:
The system performs channel access procedures over a subset of beams rather than all indicated beams. This partial action maintains transmission reliability by ensuring successful channel access on sufficient beams for adequate transmission quality, while significantly reducing the time consumption compared to performing procedures on all beams
Solution Approach 2:
The base station performs preliminary action by pre-indicating which beams are suitable for channel access through grants. This allows the wireless device to focus channel access procedures on pre-selected promising beams rather than exhaustively testing all possible beams, thereby maintaining reliability while reducing time consumption
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless node may receive a grant of a set of resources for an uplink transmission from another wireless node. The wireless node may identify a plurality of beams for performing channel access for the uplink transmission based on receiving the grant. The wireless node may perform channel access procedures over at least a subset of beams of the plurality of beams. The wireless node may transmit over one or more beams of the subset of beams based on successful completion of one or more of the channel access procedures.