Channel-Aware Modulation Order Selection for PDCCH Bandwidth
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Solution Overview
Problem
The limited bandwidth for physical downlink control channels (PDCCH) in wireless communication systems reduces throughput by allocating resources that could otherwise be used for downlink data transmissions, as control bits are frequently communicated to adapt to changing conditions.
Innovation Solution
A user equipment (UE) and a network node share channel-related and network parameters to select a modulation order, allowing for increased modulation order of downlink control information (DCI) when channel conditions support it, thereby optimizing bandwidth allocation between control information and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control bits are communicated frequently via PDCCH to enable adaptive operating mode changes, then adaptability is improved, but bandwidth for downlink data transmission is reduced
Solution Approach 1:
The patent changes the parameter of modulation order from fixed to variable, allowing the system to adapt modulation schemes (e.g., QPSK, 16QAM, 64QAM, 256QAM) based on channel conditions. This enables more control information to be transmitted efficiently without proportionally increasing bandwidth allocation, as higher-order modulations carry more bits per symbol.
Solution Approach 2:
The system dynamically adjusts the modulation order for PDCCH transmissions based on real-time channel quality indicators (CQI) and signal-to-noise ratio (SNR) measurements. This dynamic adaptation allows the control channel to optimize its spectral efficiency while maintaining reliability, freeing up bandwidth for data transmissions without compromising adaptability.
2Quantity of substance
If bandwidth allocated to PDCCH is increased to communicate more control information, then quantity of control information is improved, but downlink data transmission resources are reduced
Solution Approach 1:
Instead of increasing bandwidth allocation, the patent changes the modulation order parameter to increase control information capacity. By using higher-order modulations like 64QAM or 256QAM when channel conditions permit, the system transmits more control bits per Hertz of spectrum, maintaining data transmission resources while increasing control channel capacity.
Solution Approach 2:
The patent applies different modulation orders to different parts of the control information transmission based on local channel conditions. Users with good channel quality receive higher-order modulation for more efficient control information delivery, while users with poor channel quality receive more robust lower-order modulation, optimizing overall system efficiency without uniformly increasing bandwidth requirements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication, and to channel aware modulation order selection for wireless communications. For example, a user equipment (UE) may transmit one or more channel-related parameters to a network node. The network node may select a modulation order in accordance with the one or more channel-related parameters and one or more network parameters that are transmitted to the UE. The network node may modulate a bitset in accordance with the modulation order to generate a modulated bitstream that is transmitted to the UE. The UE may select the same modulation order in accordance with the one or more channel parameters and the one or more network parameters received from the network node, such that the UE may demodulate the modulated bitstream in accordance with the modulation order to generate a demodulated bitset.