Eight-Port Uplink Codebooks With Low-Overhead Precoder Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in supporting multiple transmit uplink transmissions, particularly with eight antenna ports, due to limitations in codebook design and precoder indication, which affect coherence assumptions and power modes, leading to inefficiencies in data transmission.
Innovation Solution
The development of enhanced specifications and codebook designs for up to eight transmit antenna ports, including fully-coherent, partially-coherent, and non-coherent configurations, with mechanisms for precoder indication, to support various coherence assumptions and power modes, enabling efficient uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If codebook designs are enhanced to support up to eight transmit antenna ports with fully-coherent, partially-coherent, and non-coherent configurations, then the adaptability and versatility of the system improve, but the device complexity increases
Solution Approach 1:
The codebook is divided into multiple codebook groups, each corresponding to different coherence assumptions (fully-coherent, partially-coherent, non-coherent). This segmentation allows the system to select appropriate codebook groups based on the coherence capability of the antenna ports, thereby supporting multiple configurations without requiring a single overly complex codebook structure.
Solution Approach 2:
The system dynamically selects between different codebook groups and power modes based on the coherence assumption and transmission requirements. The precoder indication mechanism allows flexible switching between codebook groups, enabling the system to adapt to varying coherence conditions while maintaining manageable codebook complexity through selective usage.
2Productivity
If precoder indication mechanisms are implemented to support multiple transmit antenna ports, then the productivity of uplink transmissions improves, but the loss of information increases due to additional signaling requirements
Solution Approach 1:
The precoder indication mechanism is designed to serve multiple functions: it indicates both the codebook group selection and the specific precoder within that group. By making the indication mechanism multi-functional, the system reduces the need for separate signaling fields, thereby improving productivity while minimizing the loss of information to signaling overhead.
Solution Approach 2:
The system uses partial precoder indications that are sufficient for the specific transmission scenario rather than providing complete precoder information in all cases. This partial action approach reduces signaling overhead while maintaining adequate productivity for the given coherence assumptions and transmission requirements.
Data Source
AI summary
Systems and methods for supporting multiple (e.g., eight) transmit (Tx) uplink (UL) transmissions are discussed. This includes discussion of related codebook-based transmission schemes. User equipment (UE) capabilities and configurations are discussed. Detailed codebook design for a full-coherent eight Tx UL is discussed. Associated rank indicator (RI) and transmit precoding matrix indicator (TPMI) indexes in downlink control information (DCI), including various enhancements for overhead reduction, are also discussed. In some embodiments, a UE receives, from a network, a DCI that schedules an UL transmission and includes a precoder index to a first precoder of a fully-coherent codebook corresponding to an antenna configuration supported by the UE having a plurality of precoders for a use of eight fully-coherent antenna ports; identifies the first precoder from the plurality of precoders using the precoder index; precodes the UL transmission using the first precoder; and transmits the precoded UL transmission to the network.