CDM Group Mapping for Multi-Source Wireless Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current techniques for conveying single-source transmission configurations in wireless networks face challenges when extending them to support multiple transmission sources, particularly in 5G networks, leading to inefficiencies in multi-source transmission scenarios.
Innovation Solution
The implementation of methods for receiving and transmitting multiple Transmission Configuration Indicator (TCI) states, each with source RS pairs, and determining channel parameters based on quasi-colocation (QCL) relations with antenna ports, allowing for the mapping of demodulation reference signals (DM-RS) to code-division multiplexing (CDM) groups, facilitating multi-source transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current single-source transmission configuration techniques are used, then device complexity is reduced, but adaptability deteriorates when extending to multiple transmission sources
Solution Approach 1:
The patent segments the transmission configuration by introducing separate TCI states for different CDM groups. Each TCI state can be independently configured and activated, allowing the system to handle multiple transmission sources by dividing the configuration into manageable segments rather than treating it as a single complex configuration.
Solution Approach 2:
The patent adds a new dimension to the transmission configuration by introducing CDM group indexing alongside TCI state indexing. This multi-dimensional approach (TCI state index + CDM group index) enables the system to distinguish between multiple transmission sources and their associated reference signals, thereby improving adaptability without overwhelming complexity.
2Adaptability or versatility
If multiple TCI states with source RS pairs are implemented, then multi-source transmission adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring multiple TCI states in advance through RRC signaling before actual transmission occurs. The network pre-configures the TCI state list with source RS pairs and CDM group associations, so that when multi-source transmission is needed, the UE already has the necessary configuration information ready, reducing real-time processing complexity.
Solution Approach 2:
The patent introduces dynamic activation and deactivation of TCI states through MAC CE signaling. The network can dynamically select which TCI states are active based on current transmission needs, allowing the system to adapt to varying multi-source transmission requirements while keeping the actual active configuration manageable and not permanently burdened with all possible configurations.
Data Source
AI summary
Embodiments include method, for a user equipment (UE) to transmit or receive a plurality of physical data channels in a wireless network. Such methods include receiving, from the wireless network, an indication of a Transmission Configuration Indicator (TCI) state that includes one or more source reference signal (RS) pairs. Each source RS pair has a pair of quasi-colocation (QCL) relations with antenna ports, for demodulation reference signals (DM-RS), that are mapped to a plurality of code-division multiplexing (CDM) groups. Such methods include receiving or transmitting the plurality of physical data channels based on the QCL relations for the one or more source RS pairs of the indicated TCI state. Other embodiments include complementary methods performed by a wireless network, and UEs and wireless networks configured to perform such methods.