Dynamic OMA/NOMA Selection for Collision-Limited Wireless Access
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Solution Overview
Problem
The performance of non-orthogonal multiple access (NOMA) in 5G wireless networks is impacted by user equipment collisions and increased complexity, particularly in scenarios with varying traffic loads and UE states, leading to degraded signal-to-interference ratio (SINR) and reduced support for massive Machine Type Communications (mMTC).
Innovation Solution
The implementation of explicit and implicit methods to configure and indicate multiple access transmission schemes, including orthogonal multiple access (OMA) and NOMA, through semi-persistent or dynamic scheduling grants, with parameters such as indicators, MA signatures, and ACK/NACK status, to optimize performance and complexity in various UE states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access (NOMA) is implemented to support massive Machine Type Communications (mMTC), then the number of supported connections and data rates are improved, but user equipment collisions increase and signal-to-interference ratio (SINR) degrades
Solution Approach 1:
The patent implements dynamic switching between OMA and NOMA transmission schemes based on real-time network conditions, UE states, and traffic loads. The network node receives indication information from the UE about its current state and selects the appropriate multiple access scheme dynamically, allowing the system to adapt to changing conditions and optimize both connection capacity and SINR performance
Solution Approach 2:
The patent changes the transmission scheme parameter (OMA vs NOMA) based on UE state (idle, inactive, connected) and network conditions. By modifying this key parameter dynamically, the system achieves high productivity for mMTC while maintaining acceptable SINR through appropriate scheme selection rather than fixed operation
2Productivity
If non-orthogonal multiple access (NOMA) is used to enhance data rates, then throughput is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects between OMA and NOMA based on UE state and network conditions, avoiding the need for UEs to continuously process complex NOMA operations. When conditions are favorable, NOMA provides high data rates; otherwise, the simpler OMA scheme is used, reducing overall device complexity while maintaining high productivity when possible
Solution Approach 2:
The transmission scheme parameter is changed based on operational conditions, allowing the system to achieve high data rates through NOMA when capabilities permit, while falling back to lower-complexity OMA when device resources are constrained or conditions are unfavorable
3Reliability
If explicit configuration methods are used to indicate multiple access schemes, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent uses indication information as an intermediary mechanism that conveys UE state and capability data to the network node. This intermediary enables reliable transmission scheme selection without requiring extensive direct signaling, as the indication information encapsulates multiple pieces of relevant data in a compact form that reduces overall signaling overhead
Data Source
AI summary
A wireless communication method includes a network node that transmits to one or more communication nodes a set of parameters for selection of a multiple access transmission scheme from a plurality of multiple access transmission schemes, such as an orthogonal multiple access (OMA) scheme and a non-orthogonal multiple access (NOMA) scheme. The network node receives data transmitted by a communication node using the multiple access transmission scheme selected by the communication node. The network node can also transmit one or more sets of parameters for one or more transmission configuration groups or a set of parameters for re-transmission, where the transmission configurations group(s) and the parameters for re-transmission define a multiple access transmission scheme to be selected from a plurality of multiple access transmission schemes.