Reference Signal Configuration for Adaptive UL-DL Massive MIMO
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Solution Overview
Problem
Existing wireless communication systems, particularly in cell-free massive MIMO networks, face limitations in network flexibility and latency due to fixed UL and DL mode assignments, which fail to accommodate heterogeneous data requirements and cause unintended delay.
Innovation Solution
Implement adaptive UL-DL communication direction assignment in cell-free massive MIMO networks based on channel, interference, and traffic conditions, enabling flexible FD communications through centralized, distributed, or decentralized schemes, allowing APs to determine their communication direction locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed UL and DL mode assignments are used in cell-free massive MIMO networks, then system operation is simplified, but network flexibility is reduced and latency increases
Solution Approach 1:
The patent implements dynamic UL-DL mode assignment where access points can switch between uplink and downlink modes based on real-time channel conditions, interference levels, and traffic requirements. This dynamic adaptation allows the system to optimize performance for heterogeneous data requirements while maintaining manageable operational complexity through automated decision-making algorithms.
2Device complexity
If fixed UL and DL mode assignments are used, then configuration is simplified, but communication latency increases due to inability to accommodate heterogeneous data requirements
Solution Approach 1:
The system dynamically changes operational parameters including transmission direction, mode switching timing, and resource allocation based on real-time measurements of channel quality, interference conditions, and data requirements. This parameter adaptation enables the system to minimize latency by optimizing the timing and configuration of UL-DL mode transitions without requiring complex manual configuration.
3Adaptability or versatility
If adaptive UL-DL communication direction assignment is implemented, then network flexibility is improved, but system complexity increases
Solution Approach 1:
Access points autonomously determine their communication direction and mode assignment based on local measurements of channel conditions and interference levels. This self-service mechanism enables high network flexibility while distributing the complexity management across multiple independent nodes, reducing the burden on centralized control and simplifying overall system architecture.
4Loss of time
If adaptive UL-DL communication direction assignment is implemented, then communication latency is reduced, but signaling overhead increases
Solution Approach 1:
The system employs feedback mechanisms where access points report channel conditions and interference measurements to enable adaptive UL-DL mode assignment. This feedback loop allows latency reduction through real-time optimization while the feedback itself carries only essential information, minimizing signaling overhead compared to continuous detailed reporting.
Data Source
AI summary
Various aspects of the present disclosure relate to reference signals for access point and user equipment configuration. An apparatus, such as a user equipment (UE), receives, from one or more access points a first configuration message comprising one or more uplink transmit reference signal resources, one or more inter-UE cross-link interference measurement resources, and one or more inter-UE cross-link interference reporting resources. The apparatus transmits, based at least in part on the first configuration message, one or more uplink transmit reference signals comprising at least one of one or more inter-UE cross-link interference reference signals or one or more uplink channel state information reference signals. The apparatus receives, based at least in part on the first configuration message, at least one of one or more uplink transmit reference signals from one or more UEs or one more downlink reference signals from one or more access points.