Adaptive PDCCH Modulation Order for 5G Control Channels
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Solution Overview
Problem
In LTE and 5G communication systems, the modulation order of the Physical Downlink Control Channel (PDCCH) is fixed at QPSK, limiting flexibility and transmission performance, as it cannot be adaptively determined based on channel quality.
Innovation Solution
A method and apparatus for determining and modulating the modulation order of the PDCCH, allowing for dynamic selection based on link types, channel conditions, and other factors, enabling modulation orders such as 16 QAM, 64 QAM, or 1024 QAM, and performing blind detection and demodulation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the modulation order of PDCCH is fixed at QPSK, then the reliability of control channel is ensured, but the flexibility and transmission performance are limited
Solution Approach 1:
The patent applies dynamics by making the modulation order of PDCCH adjustable rather than fixed. The network device can dynamically select different modulation orders (QPSK, 16QAM, 64QAM, 256QAM) based on link quality and transmission requirements, allowing the system to adapt to changing channel conditions while maintaining reliability through selective modulation scheme choice
Solution Approach 2:
The patent changes the modulation order parameter from a fixed value to a variable that can be selected from multiple options. By introducing configurable modulation orders (2, 4, 6, 8 bits per symbol) and allowing the network device to select appropriate modulation schemes based on channel quality indicators, the system achieves both reliability and flexibility
2Ease of manufacture
If the modulation order of PDCCH is fixed at QPSK, then the implementation is simple, but the transmission performance is limited
Solution Approach 1:
The system maintains implementation simplicity through standardized procedures while enabling dynamic modulation order selection. The network device determines appropriate modulation orders based on pre-configured parameters and channel conditions, allowing flexible adaptation without significantly increasing system complexity
Solution Approach 2:
By allowing the modulation order parameter to vary based on channel quality and transmission requirements, the system achieves improved transmission performance. The network device can select from multiple modulation orders (2, 4, 6, 8 bits per symbol) to optimize data rate while maintaining manageable system complexity through standardized selection criteria
3Productivity
If adaptive modulation is enabled for PDCCH, then the system performance is improved, but the complexity of determining modulation order increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple modulation orders and establishing selection criteria before actual transmission. The network device has predetermined options (QPSK, 16QAM, 64QAM, 256QAM) and selection rules based on channel quality, which simplifies the real-time decision-making process while enabling adaptive modulation for improved system performance
4Adaptability or versatility
If blind detection is performed with multiple modulation orders, then the adaptability is improved, but the detection complexity increases
Solution Approach 1:
The terminal device performs blind detection with multiple modulation orders dynamically, attempting to decode PDCCH candidates using different modulation schemes. This dynamic approach allows the terminal to adapt to varying transmission conditions while the standardized detection procedures keep the implementation complexity manageable
Data Source
AI summary
Provided are a method and apparatus for transmitting control information, a method and apparatus for receiving control information, and a communication system. The method includes that: at least one modulation order of a Physical Downlink Control Channel (PDCCH) is determined; and Downlink Control Information (DCI) is modulated using the at least one modulation order.