Multi-Antenna WTRU Codebook Selection for Uplink Scheduling
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Solution Overview
Problem
Existing wireless transmit/receive units (WTRUs) with multiple transmission antennas face challenges in efficiently managing uplink transmissions with multiple codebooks and precoding matrix indicators, particularly in New Radio (NR) Release 17, which supports up to four-layer transmission and single code word transmission.
Innovation Solution
The methods and apparatuses described enable WTRUs to transmit and receive capability and configuration information for multiple antenna groups, allowing for the determination and utilization of one or more codebooks and precoding matrix indicators (TPMIs) based on scheduling information, facilitating efficient uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codebooks and precoding matrix indicators are used for uplink transmissions with multiple antennas, then transmission efficiency and adaptability are improved, but device complexity and management difficulty increase
Solution Approach 1:
The patent segments the codebook management by associating different codebooks with different antenna groups. Each antenna group can be independently configured with specific codebooks and TPMIs, allowing the system to handle multiple antennas through modular, grouped management rather than monolithic control. This segmentation reduces the overall complexity by breaking down the management of multiple antennas into smaller, more manageable units.
Solution Approach 2:
The patent implements dynamic selection and configuration of codebooks and TPMIs based on scheduling information. The system can dynamically adjust which codebook and TPMI are applied to each antenna group according to current transmission requirements, channel conditions, and scheduling decisions. This dynamic approach enables adaptability while maintaining manageable complexity through context-dependent configuration rather than static, exhaustive management of all possible combinations.
2Adaptability or versatility
If multiple codebooks are configured for different antenna groups, then transmission adaptability is improved, but information overhead increases
Solution Approach 1:
The patent merges the configuration management by allowing a single scheduling information message to contain indicators for multiple TPMIs that reference shared codebook configurations. Instead of transmitting separate complete codebook configurations for each antenna group, the system combines the management into unified scheduling messages that point to pre-configured codebooks, reducing redundant information transmission while maintaining the ability to configure multiple antenna groups with different parameters.
3Adaptability or versatility
If dynamic antenna configurations are implemented, then transmission flexibility is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple codebooks and associating them with different antenna groups before actual transmission occurs. The network side prepares the codebook configurations and TPMI mappings in advance, so that during transmission, the WTRU only needs to select and apply the pre-configured options based on received scheduling information. This preliminary configuration reduces real-time processing complexity while maintaining dynamic flexibility.
Data Source
AI summary
A method implemented in a WTRU is described herein. The method may include transmitting capability information indicating a number of antenna groups and receiving configuration information indicating one codebook or more than one codebook. The method may include receiving scheduling information for a transmission. The scheduling information may indicate (a) a codebook indicator and one transmit precoding matrix indicator (TPMI) or (b) a plurality of TPMIs. Each TPMI may be associated with a group of antennas. The method may include determining a codebook of the one codebook or the more than one codebook based on any of the scheduling information and the configuration information. The method may include transmitting the transmission based on the determined codebook and (a) the one TPMI or (b) the plurality of TPMIs.