Base Station Relay Node Signal Mapping in MIMO Systems
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Solution Overview
Problem
In multiuser multi-antenna wireless communication systems, there is a need for efficient signal transmission and reception between base stations and relay nodes, particularly in LTE systems, where existing technologies face challenges in optimizing resource allocation and interference management for reliable communication.
Innovation Solution
The method involves allocating antenna ports to relay nodes, mapping downlink and uplink grant signals to specific resource regions, and transmitting these signals efficiently, allowing for simultaneous data transmission and control information handling while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple relay nodes are served simultaneously using multiuser multi-antenna technology, then system capacity and throughput are improved, but interference management and resource allocation complexity increase
Solution Approach 1:
The patent segments the service process by dividing relay nodes into two groups: those served in the first slot and those served in the second slot. This time-domain segmentation allows the base station to handle multiple relay nodes sequentially within a frame structure, improving system capacity while managing resource allocation complexity through structured time division.
Solution Approach 2:
The patent implements dynamic resource allocation by allowing flexible assignment of relay nodes to different slots based on channel conditions and traffic requirements. The base station can dynamically determine which relay nodes receive downlink grants in the first slot versus the second slot, enabling adaptive resource management that balances capacity improvement with controlled complexity.
2Reliability
If downlink grant signals are transmitted to relay nodes, then control information delivery is improved, but resource region allocation and interference management become more complex
Solution Approach 1:
The patent segments control information transmission by allocating downlink grants to different relay nodes in different time slots. Relay nodes in the first group receive downlink grants in the first slot, while relay nodes in the second group receive them in the second slot. This segmentation ensures reliable control information delivery while simplifying resource region allocation by preventing simultaneous conflicts.
Solution Approach 2:
The patent applies preliminary action by allocating specific resource regions for downlink grants before actual data transmission occurs. By pre-defining which relay nodes receive grants in which slots and assigning appropriate resource regions, the system ensures reliable control information delivery while avoiding the need for complex dynamic resource negotiation during transmission.
3Productivity
If antenna ports are allocated to relay nodes for MIMO transmission, then data transmission efficiency is improved, but signal mapping and resource management complexity increase
Solution Approach 1:
The patent segments the antenna port allocation process by associating different antenna ports with different relay node groups and time slots. This segmentation allows efficient MIMO transmission to multiple relay nodes while simplifying signal mapping, as each slot handles a subset of relay nodes with dedicated antenna port assignments rather than requiring complex simultaneous mapping for all nodes.
Data Source
AI summary
The present disclosure relates to a method in which a base station transmits signals to a relay node in a multiuser multi-antenna (MIMO) wireless communication system. More particularly, the method includes: allocating one or more antenna ports to one or more relay nodes, respectively; mapping each of a plurality of downlink grant signals for the one or more relay nodes to a preset resource domain from among resource domains corresponding to one of the allocated antenna ports; mapping uplink grant signals or data signals for the one or more relay nodes to the resource domains corresponding to the allocated antenna ports; and transmitting the mapped signals to the one or more relay nodes.