UL MIMO Full-Power Uplink Using Segmented TX Chains
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Solution Overview
Problem
Wireless transmit/receive units (WTRUs) often face challenges in achieving full power transmission due to limitations in power amplifier architectures, which hinder effective uplink MIMO transmission capabilities.
Innovation Solution
WTRUs indicate their power amplifier ratings and coherence capabilities, override codebook subset restrictions, and signal full power transmission modes, allowing them to determine and precode uplink data using a subset of TPMIs based on network permissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If WTRU uses traditional power amplifier architecture, then device complexity is reduced, but full power transmission capability is not achieved
Solution Approach 1:
The transmitter is divided into multiple TX chains, each with its own power amplifier. The WTRU indicates power ratings per TX chain and uses coherence capability bitmaps to identify which chains can be combined for full power transmission. This segmentation allows full power transmission by coordinating multiple independent chains rather than requiring a single complex power amplifier.
2Productivity
If WTRU indicates detailed power amplifier ratings and coherence capabilities, then network can optimize resource allocation, but signaling overhead increases
Solution Approach 1:
The WTRU performs preliminary actions by indicating its power amplifier ratings and coherence capabilities in advance through capability signaling. The network stores this information and uses it for future resource allocation decisions, avoiding the need for repeated detailed signaling. This preliminary action enables efficient resource allocation without continuous overhead.
3Power
If WTRU overrides codebook subset restrictions, then full power transmission is enabled, but precoding optimization is reduced
Solution Approach 1:
The system dynamically selects precoding strategies based on transmission conditions. When full power transmission is prioritized, codebook subset restrictions are overridden. When channel conditions favor precoding optimization, restrictions are applied. This dynamic approach allows the system to adapt between power maximization and precoding optimization based on current needs.
Data Source
AI summary
A WTRU may be configured to transmit to a network (e.g., in a first indication) a full power uplink transmission capability associated with the WTRU, e.g., Cap3. The WTRU may receive (e.g., in a second indication) an indication of whether the WTRU is allowed to operate with full power transmission. The WTRU may determine (e.g., from a set of TPMIs), a subset of TPMIs based on, for example, the WTRU's full power uplink transmission capability (e.g., where the subset of TPMIs includes a first TPMI). The set of TPMIs may comprise one or more subsets of TPMIs. The WTRU may transmit (e.g., in a third indication) an indication of the determined subset of TPMIs. The WTRU may receive (e.g., in a fourth indication) an indication of the first TPMI in the subset of TPMIs. The WTRU may transmit to the network uplink data precoded with the first TPMI.