Multi-Antenna Transmission via Antenna Group Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-A TDD mode, the downlink pre-coding calculated by the eNodeB fails to match radio channels between all UE's antennas and base station antennas when the number of reception antennas exceeds the number of transmission ports, and the eNodeB struggles to obtain complete radio channel conditions from all UE's antennas, leading to degraded system performance and suboptimal uplink transmission.
Innovation Solution
The method involves enhancing the SRS transmission mode by adding new SRS transmission ports and implementing antenna group alternate transmission, allowing the eNodeB to estimate channels more accurately and select optimal antenna groups for PUSCH transmission, thereby improving downlink performance and overcoming quantization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of UE reception antennas exceeds the number of SRS transmission ports, then the UE can support more reception antennas for downlink MIMO, but the eNodeB cannot obtain complete downlink radio channel information from all UE antennas
Solution Approach 1:
The UE antennas are divided into multiple antenna groups, where each group is associated with a separate SRS transmission port. This segmentation allows different antenna groups to transmit SRS signals through different ports, enabling the eNodeB to obtain channel information from all UE antennas even when the total number of antennas exceeds the number of ports.
Solution Approach 2:
Each SRS transmission port is configured to serve multiple UE antennas through the antenna group association mechanism. A single SRS port can collect channel information from multiple antennas within its associated group, making the SRS transmission system universal and scalable to support more antennas than ports.
2Adaptability or versatility
If the number of UE transmission antennas exceeds the number of SRS transmission ports, then the UE can support more transmission antennas for uplink MIMO, but the eNodeB cannot identify the optimal antenna or antenna group for PUSCH transmission
Solution Approach 1:
UE transmission antennas are segmented into multiple antenna groups, each associated with a specific SRS transmission port. This allows the eNodeB to assess channel conditions for each antenna group separately through dedicated SRS measurements, enabling precise identification of the optimal antenna or antenna group for PUSCH transmission even when total antennas exceed ports.
3Device complexity
If conventional SRS transmission is used with limited ports, then the system maintains simplicity, but the downlink pre-coding accuracy degrades when UE has more antennas than ports
Solution Approach 1:
The system dynamically associates UE antennas with SRS transmission ports based on antenna groups, allowing flexible configuration that adapts to different UE antenna counts. This dynamic association enables accurate channel measurement and pre-coding without requiring a fixed one-to-one mapping between antennas and ports, maintaining system simplicity while improving accuracy.
Data Source
Figure 1~2
AI summary
Disclosed are a multi-antenna transmission method, a terminal and a base station, wherein, an eNB sends a UE a SRS transmission mode including new SRS transmission port information and/or a signaling for instructing the UE to perform antenna group alternate transmission as well as a control signaling required by the SRS transmission mode; the UE transmits a SRS using the abovementioned SRS transmission mode, and the eNB estimates a channel information according to the SRS and calculates and transmits a precoding matrix.