MIMO Relay Control Signal Transmission via Zero-Power CSI-RS
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Solution Overview
Problem
In MIMO wireless communication systems, existing methods face challenges in effectively transmitting control signals to relay nodes, particularly in configuring resource elements for channel state information reference signals to ensure efficient communication and power balancing between antennas.
Innovation Solution
The method involves configuring relay-resource element groups (R-REGs) in units of four contiguous resource elements, allocating transmission resources for control signals, and transmitting these signals using allocated resources, with channel state information reference signals receiving zero transmission power, and indexing performed in a time-first mode per slot unit, utilizing 8 logical antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information reference signals are allocated transmission resources, then channel state information measurement capability is improved, but transmission power consumption increases and control signal transmission efficiency deteriorates
Solution Approach 1:
The patent extracts the channel state information reference signal from the resource element group allocation and assigns it zero transmission power. This separates the measurement function from power-consuming transmission, allowing the reference signal to be present for measurement purposes without consuming transmission power resources.
Solution Approach 2:
The patent changes the transmission power parameter for channel state information reference signals to zero, while maintaining their presence in the resource element group structure. This parameter change enables the reference signals to serve measurement functions without contributing to power consumption or interfering with control signal transmission.
2Productivity
If resource elements are configured for control signals, then control signal transmission efficiency is improved, but available resources for channel state information reference signals are reduced
Solution Approach 1:
The patent introduces channel state information reference signals as intermediary elements within the resource element group structure. These reference signals act as placeholders that enable measurement functionality without consuming transmission power or interfering with control signal transmission, thus mediating between the needs for efficient control signal transmission and adequate measurement resources.
3Strength
If transmission power is allocated to all resource elements, then signal strength is improved, but power balancing between antennas deteriorates and energy efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different transmission power values to different resource elements within the same resource element group. Specifically, control signal resource elements receive full transmission power while channel state information reference signal resource elements receive zero transmission power. This localized differentiation enables precise power control that maintains signal strength where needed while achieving power balancing and improving energy efficiency.
Data Source
AI summary
A method for transmitting a control signal to a relay node at a base station in a multi-input multi-output (MIMO) wireless communication system is disclosed. The method comprises configuring relay-resource element groups (R-REGs) in a unit of four resource elements (REs) contiguous in the ascending order of subcarrier indexes, except for resource elements for a reference signal (RS); allocating transmission resources to the control signal in a unit of the relay-resource element group; and transmitting the control signal to the relay node by using the allocated transmission resources, wherein the resource elements for the reference signal include resource elements for channel state information-RS (CSI-RS), which include resource elements for a channel state information RS to which a transmission power of 0 is allocated.