Codebook-Based Uplink Transmission for Wireless Communications
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Solution Overview
Problem
In wireless communications, particularly in 5G and LTE systems, there are challenges with relative phase discontinuity (RPD) and frequency coherence issues due to varying antenna configurations and propagation environments, which affect uplink transmission efficiency and power consumption.
Innovation Solution
A codebook-based uplink transmission method is proposed, where a processor in user equipment (UE) constructs a codebook with diverse precoders to support various antenna configurations, including dual-stage codebooks and permutation techniques, to reduce transmission overhead and improve system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a codebook is designed to support diverse antenna configurations and scenarios, then adaptability is improved, but device complexity increases
Solution Approach 1:
The codebook is divided into multiple codebook types (first codebook type for ULA configurations, second codebook type for non-ULA configurations). Each codebook type is further segmented into different ranks and antenna port configurations. This segmentation allows the system to select the appropriate codebook segment based on the specific antenna configuration, improving adaptability while managing complexity through organized classification.
Solution Approach 2:
The codebook design creates a universal framework that can handle multiple antenna configurations (ULA and non-ULA), different ranks (rank 1, rank 2, etc.), and various antenna port combinations through a unified codebook structure. The codebook types are designed to be mutually complementary, where the first codebook type covers ULA scenarios and the second codebook type covers non-ULA scenarios, providing universal coverage across diverse deployment conditions.
2Manufacturing precision
If codebook design optimizes for specific antenna configurations, then manufacturing precision is improved, but adaptability worsens
Solution Approach 1:
Different codebook types are designed with specialized optimizations for specific local conditions: the first codebook type is optimized for ULA configurations with specific phase relationships, while the second codebook type is optimized for non-ULA configurations with different spatial characteristics. Each codebook type contains precoders tailored to its specific antenna configuration, providing local optimization while the overall system maintains global adaptability through codebook type selection.
3Reliability
If multiple codebook types are used to cover diverse scenarios, then reliability is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects between different codebook types based on the detected antenna configuration and deployment scenario. The network device determines which codebook type (first or second) is appropriate based on whether the antenna configuration is ULA or non-ULA, and dynamically applies the corresponding codebook for precoder selection. This dynamic adaptation improves reliability by ensuring the correct codebook is used for each scenario while managing complexity through conditional selection rather than simultaneous maintenance of all codebooks.
Data Source
AI summary
Various solutions with respect to codebook-based uplink transmission in wireless communications are described. A user equipment (UE) generates a codebook comprising a plurality of precoders. The UE processes information using the codebook and transmits the processed information to a network node of a wireless network. In generating the codebook, the UE selects a candidate precoder from a single-stage codebook or a dual-stage codebook and performs a permutation on the candidate precoder.