Wireless Terminal Adaptation to Network Node Transmission Modes
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Solution Overview
Problem
Network nodes in wireless communication systems face energy wastage due to continuous signal transmission even when there are few active terminals, and existing methods for reducing energy consumption, such as entering an 'idle' or low activity mode, can disrupt terminal operations like synchronization and mobility measurements.
Innovation Solution
A method for a terminal to detect and adapt to the operational mode of a network node, switching between normal and low activity modes based on the number of active terminals, using blind detection of signal patterns and broadcast information to determine the current mode and adjust its operations accordingly, including synchronization and measurement processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network nodes continuously transmit signals to maintain synchronization with terminals, then terminals can stay synchronized with the network, but network nodes waste a lot of energy when serving cells with few or no active terminals
Solution Approach 1:
The network node dynamically switches between normal operation mode and low activity mode based on the number of active terminals. When the number of active terminals is below a threshold, the node transitions to low activity mode with restricted downlink transmissions, reducing energy consumption while maintaining basic synchronization functionality for idle terminals
Solution Approach 2:
The transmission parameters of the network node are changed based on terminal activity levels. In low activity mode, the node transmits signals at reduced power levels and with reduced frequency compared to normal operation mode, adapting the transmission parameters to match the actual network conditions and terminal requirements
2Loss of energy
If network nodes reduce downlink transmissions to save energy in low activity mode, then energy consumption is reduced, but terminals may have difficulty maintaining synchronization and performing mobility measurements
Solution Approach 1:
The reduced set of downlink signals transmitted in low activity mode serves multiple functions simultaneously: synchronization signals maintain terminal synchronization with the network, broadcast messages deliver essential system information to idle terminals, and reference signals enable mobility measurements for cell reselection and handover. This multi-functional approach ensures reliable operation with minimal transmissions
3Reliability
If network nodes transmit all signals continuously in normal operation mode, then terminals can perform all operations reliably, but energy is wasted when the cell has few active terminals
Solution Approach 1:
The downlink transmission spectrum is segmented into essential signals required for basic terminal operations (synchronization, system information, mobility measurements) and non-essential signals. In low activity mode, only the essential segment is transmitted, while non-essential transmissions are restricted or eliminated, achieving energy efficiency without compromising terminal operation reliability
Data Source
AI summary
Wireless communication network terminal operation is disclosed. The network comprises wireless network nodes having first and second downlink transmission modes. The first mode involves normal operation of a particular network node and is applicable when a number of active terminals in a cell associated with the particular network node is greater than a first mode threshold value. The second mode involves restricted downlink transmission of the particular network node and is applicable when the number of active terminals in the cell associated with the particular network node is not greater than a second mode threshold value. A cell identity is detected for a cell associated with a wireless network node of the wireless communication system. A current downlink transmission mode of the node is detected as the first or second downlink transmission mode, and an operation of the terminal is adapted based on the detected current downlink transmission mode.