Antenna Port Group Offset Segmentation for 5G LAA Beamforming
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Solution Overview
Problem
In 5G LAA systems with beamforming, the introduction of beamforming complicates the Listen Before Talk (LBT) mechanism, leading to potential LBT failures and reduced transmission opportunities on unlicensed spectrum due to simultaneous occupation of time resources by multiple beams, causing interference and idle time units.
Innovation Solution
Configuring different offset sets for different beams allows User Equipment (UE) to autonomously select unique transmission start times, avoiding simultaneous resource occupation and ensuring even transmission opportunities across beams, while also considering subcarrier spacings for adaptive offset adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is introduced to LBT in 5G LAA systems, then simultaneous transmission of multiple beams can be realized, but multiple UEs in different beam directions may select the same start offset, causing time resource occupation and LBT failure for other UEs
Solution Approach 1:
The patent segments the start offset selection space by associating different offset sets with different antenna port groups (beams). Each antenna port group has its own dedicated offset set, preventing UEs using different beams from selecting the same start offset. This segmentation resolves the collision problem while maintaining high transmission efficiency across multiple beams.
Solution Approach 2:
The patent introduces a new dimension to the offset selection mechanism by linking offset sets to antenna port groups. Instead of a single shared offset pool, the system creates multiple offset dimensions corresponding to different beam directions, allowing simultaneous beam transmissions without temporal conflicts.
2Device complexity
If a single offset set is used for all antenna ports, then configuration is simple, but all beams may occupy the same time resources, causing interference and reducing transmission opportunities
Solution Approach 1:
The patent divides the single offset set into multiple antenna-port-specific offset sets. Each antenna port group receives a dedicated offset set from the network, ensuring that beams transmitted through different antenna ports use different time resources. This segmentation prevents resource conflicts while maintaining systematic configuration management.
Solution Approach 2:
The patent applies local quality by customizing offset sets for specific antenna port groups rather than using a uniform offset configuration for all beams. Each antenna port group can have optimized offset characteristics suitable for its specific beamforming configuration, improving overall resource utilization.
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE receives first information, and transmits a first radio signal using a first antenna port group; the first information is used for indicating a first offset set, and the first offset set includes K1 first-type offset(s); time domain resources occupied by the first radio signal start from a first time, a time interval between the first time and a second time is equal to a target offset; the UE selects the target offset from the K1 first-type offset(s) autonomously. The disclosure establishes a relationship between the first offset set and the first antenna port group, thus improving opportunities of beamforming based grant-free data transmission on unlicensed spectrum and reducing probability of collision, thereby improving spectrum efficiency and overall performances of the system.