Antenna Precoding Reporting via Segmented Codebooks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communication systems, particularly in LTE and LTE-Advanced, face challenges in efficiently reporting control information for massive two-dimensional antenna arrays due to limited capacity of uplink control channels, which hinders accurate operation of these arrays.
Innovation Solution
A communication device that receives and transmits antenna array dimension precoding information at different periods and time instants, optimizing resource usage by distinguishing between vertical and horizontal movements, allowing for efficient reporting of channel state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 2D antenna array with many antenna ports is implemented to improve signal energy focusing and communication performance, then the accuracy of eNB operation is improved, but the capacity of UL control channels becomes insufficient for transmitting all the required control information
Solution Approach 1:
The precoding information is segmented into two separate codebooks (first codebook for horizontal dimension, second codebook for vertical dimension), allowing the control information to be divided into manageable parts that can be transmitted within the limited UL control channel capacity while still providing accurate channel state information for the 2D antenna array
Solution Approach 2:
The solution introduces a two-dimensional codebook structure with separate horizontal and vertical dimensions, transforming the single-dimension precoding problem into a two-dimensional solution space. This allows comprehensive channel state reporting for 2D antenna arrays while maintaining compatibility with limited control channel resources through structured dimensionality separation
2Reliability
If all control information is transmitted simultaneously to ensure complete channel state information is available, then the eNB can operate the 2D antenna array accurately, but the UL control channel capacity is exceeded
Solution Approach 1:
The control information transmission is segmented into multiple independent codebook structures (first and second codebooks), each handling specific dimensional precoding information. This segmentation allows the total control information to be distributed across available channel resources without exceeding capacity, while maintaining complete channel state information through the combined use of both codebooks
Solution Approach 2:
The solution changes the structural parameters of control information transmission by introducing separate codebook indices (i1, i2) for different dimensions, transforming a single large information block into structured, dimension-separated parameters that can be efficiently encoded and transmitted within UL control channel constraints
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A communication device (20) for reporting control information comprises a storage unit (210) for storing instructions (214) and a processing means (200) coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise receiving a first period for transmitting first antenna array dimension precoding information from a network (302); and receiving a second period for transmitting second antenna array dimension precoding information from the network (304), wherein the first period is different from the second period.