Dynamic Power Allocation in NR-LTE Dual Connectivity
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Solution Overview
Problem
In wireless communications, the non-ideal X2-based backhauls in 3GPP Release 15 New Radio (NR) dual connectivity scenarios lead to latency and limited capacity, affecting the efficient power allocation and transmission in dual connectivity networks between LTE and NR systems.
Innovation Solution
The solution involves determining and dynamically managing transmission power for LTE and NR uplinks in EN-DC and NE-DC scenarios through power control parameters, scaling factors, and power sharing mechanisms, allowing for efficient power allocation and reporting, even under uplink power limitations, by categorizing subframes and slots based on potential overlapping transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If X2-based backhaul links are used to connect MeNB and SeNB in dual connectivity, then network architecture is simplified, but latency increases and capacity is limited
Solution Approach 1:
The patent extracts the power control decision-making function from the centralized MeNB and relocates it to the distributed SeNB. This allows the SeNB to independently determine power control parameters for UEs in its serving cells, eliminating the need for real-time X2 signaling for power control decisions, thus reducing backhaul latency while maintaining architectural simplicity.
Solution Approach 2:
The patent implements preliminary configuration of power control parameter sets at the SeNB before actual power control is needed. The MeNB provides multiple candidate power control parameter sets to the SeNB in advance, and the SeNB can immediately select and apply the appropriate set based on current UE conditions without real-time X2 communication, thereby reducing latency.
2Productivity
If power is allocated to both LTE and NR uplinks simultaneously, then transmission performance is improved, but power limitations are exceeded
Solution Approach 1:
The patent implements dynamic power sharing between LTE and NR uplinks based on real-time conditions. The SeNB determines power control parameters dynamically for each uplink transmission, adjusting the power allocation ratio between LTE and NR according to channel conditions, QoS requirements, and current power availability, thereby optimizing transmission performance while respecting power constraints.
Solution Approach 2:
The patent changes the power control parameters (such as power offsets, scaling factors, and power sharing ratios) based on the determined uplink slot type. Different parameter sets are applied for different slot types (e.g., LTE-only slots, NR-only slots, overlapping slots), enabling flexible power distribution that adapts to varying transmission requirements while maintaining compliance with maximum power limits.
3Reliability
If power control parameters are determined by MeNB with X2 signaling, then centralized control is maintained, but signaling overhead and latency increase
Solution Approach 1:
The patent segments the power control functionality into two parts: centralized configuration of power control parameter sets by the MeNB, and distributed selection and application of these parameters by the SeNB. This segmentation maintains centralized control policy while distributing execution, thereby reducing X2 signaling overhead and latency for real-time power control operations.
Data Source
AI summary
Embodiments of the present disclosure describe methods, apparatuses, storage media, and systems for determining dynamic power sharing in a dual connectivity network. Other embodiments may be described and claimed.