Adaptive DMTC Window Sizing for Unlicensed Spectrum Discovery
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Solution Overview
Problem
In wireless communication networks, especially in LTE systems operating in unlicensed spectrum, there is uncertainty regarding the availability of discovery signals due to listen-before-talk (LBT) procedures, leading to challenges in UE scheduling and power consumption, particularly when synchronization is varying or interference levels are high, affecting mobility and channel access delays.
Innovation Solution
The DMTC window size is dynamically adjusted based on expected LBT delays and network synchronization levels, allowing for adaptive timing configuration of discovery signal measurements, which is conveyed to UEs through dedicated signaling or system information updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the DMTC window size is fixed, then the UE scheduling is simplified, but the UE power consumption increases and mobility performance degrades under varying synchronization and high interference conditions
Solution Approach 1:
The patent applies dynamics by making the DMTC window size adaptable rather than fixed. The network node determines the DMTC window size based on current channel access delay conditions, allowing the system to dynamically adjust the measurement timing configuration to match varying network conditions, thereby reducing UE power consumption while maintaining scheduling simplicity.
Solution Approach 2:
The patent changes the parameter of DMTC window size based on assessed channel access delays. By adjusting this timing parameter according to actual network conditions (such as LBT success rates and interference levels), the system optimizes UE power consumption and mobility performance without complicating the scheduling mechanism.
2Device complexity
If the DMTC window size is fixed, then the configuration is simple, but mobility performance degrades under varying synchronization and high interference conditions
Solution Approach 1:
The patent makes the DMTC window size dynamic based on network conditions. The network node assesses channel access delays and adjusts the DMTC window size accordingly, ensuring reliable mobility performance under varying synchronization and interference conditions while keeping the configuration mechanism relatively simple through automated adaptation.
Solution Approach 2:
The patent implements feedback by having the network node continuously assess channel access delay conditions and use this information to determine appropriate DMTC window sizes. This feedback loop ensures that mobility performance is maintained under varying network conditions without requiring complex manual configuration.
3Use of energy by moving object
If the DMTC window size is reduced, then the UE power consumption decreases, but the reliability of discovery signal measurement is compromised under high LBT delay conditions
Solution Approach 1:
The patent adjusts the DMTC window size parameter based on assessed channel access delays. When LBT delays are high, the window size is increased to ensure reliable discovery signal measurement; when delays are low, the window size is reduced to minimize UE power consumption. This adaptive parameter adjustment resolves the contradiction between energy efficiency and measurement reliability.
Solution Approach 2:
The patent makes the DMTC window size dynamic rather than static. The network node continuously monitors channel access conditions and adjusts the window size in real-time, allowing the system to optimize the balance between UE power consumption and discovery signal measurement reliability according to actual network conditions.
4Adaptability or versatility
If the LBT procedure is applied in unlicensed spectrum, then channel sharing with other radio devices is enabled, but uncertainty in transmission availability increases
Solution Approach 1:
The patent uses feedback from LBT procedure outcomes to adjust the DMTC window size. By monitoring channel access success rates and delay conditions resulting from LBT, the network node adapts the measurement timing configuration to compensate for transmission uncertainty, thereby maintaining reliable discovery signal acquisition despite the inherent randomness of LBT-based channel sharing.
Solution Approach 2:
The patent applies beforehand cushioning by increasing the DMTC window size when LBT delays are expected to be high. This creates a time buffer that ensures discovery signals can be reliably measured even when channel access is delayed due to LBT procedures, compensating for the uncertainty in transmission availability while maintaining channel sharing capability.
Data Source
AI summary
Disclosed herein is a method implemented in a network node configured to operate in a wireless network for adjusting the length of a search window, in which a wireless communication device is required to search for signals from other network nodes. The method comprises the steps of determining a degree of synchronization of the network, estimating an expected delay to acquire a channel within the network, determining a search window length and informing the wireless communication device of the determined search window length. Also disclosed herein is an arrangement of a network node and a computer program product.