Uplink Precoding Matrix Selection for Eight-Antenna Wireless Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing wireless signal transmission and reception procedures.
Innovation Solution
A method and apparatus for transmitting and receiving signals in a wireless communication system that involves receiving a medium access control (MAC) control element related to uplink antenna ports, determining a precoding matrix set through downlink control information (DCI), and using a precoding matrix for signal transmission or reception based on a transmission precoding matrix index (TPMI) field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a precoding matrix set is determined through MAC CE for at least eight uplink antenna ports-based transmission, then the adaptability of the communication system is improved, but the device complexity increases
Solution Approach 1:
The precoding matrix set is segmented into multiple subsets, where each subset contains precoding matrices for specific transmission ranks. The MAC CE dynamically selects which subset to use, allowing the system to adapt to different channel conditions without managing the entire large precoding matrix set at once. This segmentation reduces the computational complexity of precoding matrix selection while maintaining adaptability across different transmission scenarios.
Solution Approach 2:
The MAC CE performs preliminary action by pre-determining and indicating the appropriate precoding matrix subset before the actual uplink transmission occurs. The base station selects the suitable precoding matrix subset based on channel state information and transmits the subset index to the user equipment via MAC CE. This preliminary selection process simplifies the real-time processing required at the user equipment, as the device only needs to select a precoding matrix from the pre-selected subset rather than searching through the entire precoding matrix set.
2Adaptability or versatility
If multiple codebooks are configured for the user equipment through higher layer signaling, then the versatility of the system is improved, but the loss of time for configuration and processing increases
Solution Approach 1:
The codebook is segmented into multiple subsets, each corresponding to specific transmission ranks or channel conditions. Instead of configuring and processing a single large codebook, the system divides the codebook into smaller, more manageable subsets. The MAC CE indicates which subset should be used for the current transmission, reducing the time required for codebook processing and precoding matrix selection while maintaining the versatility of having multiple codebooks configured through higher layer signaling.
Data Source
AI summary
According to at least one of embodiments disclosed in the present specification, a method by which a terminal transmits a signal in a wireless communication system comprises: receiving a medium access control (MAC) control element (CE) related to transmission based on at least eight uplink antenna ports; receiving, over a physical downlink control channel (PDCCH), DCI for uplink scheduling, including a transmission precoding matrix index (TPMI) field; and transmitting an uplink signal on the basis of the DCI, wherein, on the basis that the DCI is for the transmission based on the at least eight uplink antenna ports, a set of precoding matrixes is determined by means of the MAC CE, and, from the set of the precoding matrixes determined through the MAC CE, a precoding matrix for the uplink signal may be determined on the basis of an index value of the TPMI field.