DRX Wake Sub-Frame Collision Handling in LTE Dual Connectivity
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Solution Overview
Problem
In the context of dual connectivity scenarios in LTE networks, there is a challenge in coordinating Discontinuous Reception (DRX) behavior with Time Division Multiplexing (TDM) patterns, leading to potential conflicts and inefficiencies in power consumption and Quality of Service (QoS) performance for User Equipment (UE) operating in heterogeneous networks.
Innovation Solution
The proposed solution involves detecting overlapping DRX wake sub-frames with sub-frames allocated to another Base Station (BS) and removing these collisions by delaying or dropping the DRX wake sub-frames, while configuring DRX threads and periodicity to align with TDM sub-frames, and switching bearers between BSs to operate in uplink and downlink decoupled modes as necessary, using Radio Resource Control (RRC) signaling and Downlink Control Information (DCI) or Media Access Control (MAC) Control Elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DRX wake sub-frames are configured without considering TDM pattern, then DRX monitoring can be performed normally, but collision with sub-frames allocated to another BS occurs causing QoS degradation
Solution Approach 1:
The patent applies preliminary action by detecting potential collisions between DRX wake sub-frames and TDM allocated sub-frames before they occur. The UE identifies overlapping sub-frames in advance and removes the collision by delaying or dropping the DRX wake sub-frame, preventing QoS degradation before it happens.
Solution Approach 2:
The patent changes the timing parameter of DRX wake sub-frames to resolve conflicts with TDM patterns. By adjusting the DRX wake sub-frame timing (delaying or dropping) based on TDM allocation, the system achieves coordinated operation between DRX monitoring and dual connectivity requirements.
2Reliability
If DRX wake sub-frames are delayed or dropped to avoid collision, then QoS performance is maintained, but power consumption reduction efficiency decreases
Solution Approach 1:
The patent dynamically adjusts DRX wake sub-frame parameters (timing, periodicity) based on TDM pattern detection. By optimizing the alignment between DRX cycles and TDM allocated sub-frames, the system minimizes the need for delaying or dropping wake sub-frames, thereby maintaining power saving efficiency while ensuring QoS.
3Adaptability or versatility
If sub-frames are partitioned for TDM operation in dual connectivity, then connection to multiple BS is enabled, but conflict with DRX behavior occurs
Solution Approach 1:
The patent applies preliminary action by detecting the TDM pattern and identifying potential DRX-TDM conflicts before they occur. The UE proactively adjusts DRX wake sub-frame timing based on the detected TDM pattern, ensuring coordinated operation between dual connectivity requirements and DRX power saving mode.
Solution Approach 2:
The patent changes DRX operational parameters (wake sub-frame timing, periodicity) to align with TDM patterns. By dynamically adjusting these parameters based on the dual connectivity TDM configuration, the system resolves conflicts between multi-BS connection requirements and DRX monitoring behavior.
Data Source
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AI summary
The disclosure relates to a DRX method with TRM limitation. In one embodiment, the DRX method comprises steps of detecting a DRX wake sub-frame to be set for a first BS at least partially overlaps with a sub-frame allocated to a second BS, and removing a collision of the DRX wake sub-frame to the sub-frame allocated to the second BS without change to the sub-frame allocated to the second BS. There is also provided a user equipment using the DRX method. By removing the collision without change to the sub-frames allocated in accordance with TDM, the user equipment may work in the DRX mode well.