Duplication Bearer Deactivation for Wireless Link Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly those employing LTE and NR technologies, face challenges in managing duplication bearers effectively, leading to inefficiencies in data communication when a default link fails, as existing methods lack robust mechanisms for deactivation and reconfiguration of duplication bearers.
Innovation Solution
The proposed solution involves determining the deactivation of a duplication bearer for a PDCP connection, scheduling data communication only over the default link, and reestablishing or reconfiguring the bearer upon detection of a failure in the default link, allowing for seamless communication by maintaining redundancy through the duplication link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplication bearer is activated with multiple links for redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic bearer management by enabling the network to activate or deactivate duplication bearers through MAC control elements. The system transitions from static bearer configuration to dynamic activation/deactivation based on network conditions, allowing the duplication bearer to be activated when reliability is needed and deactivated when resources should be conserved or links fail.
Solution Approach 2:
The patent establishes duplication bearers in advance with pre-configured primary and secondary RLC entities before they are needed. The network can quickly activate the duplication bearer by simply switching on the pre-configured secondary path, avoiding the complexity and time of establishing new bearers during failure recovery.
2Reliability
If data is scheduled on both primary and secondary links, then reliability is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent applies different transmission strategies to different links based on their status. The primary link carries all data transmissions under normal conditions, while the secondary link remains dormant or is activated only for specific redundant transmissions when needed. This localized differentiation avoids the waste of continuously transmitting on both links while maintaining reliability through selective activation.
Solution Approach 2:
Instead of continuously transmitting duplicate data on both links, the patent creates copies of data packets only when the duplication bearer is activated. The secondary RLC entity receives and transmits copied packets only during activation periods, reducing overall resource consumption while maintaining the reliability benefit of having redundant transmission paths available.
3Reliability
If duplication bearer remains active for failure recovery, then reliability is improved, but loss of time increases due to prolonged resource allocation
Solution Approach 1:
The patent pre-configures the duplication bearer with all necessary RLC entities, bearers, and routing information before any failure occurs. When a link failure is detected, the network can immediately activate the pre-prepared secondary path without needing to establish new bearers or reconfigure existing ones, dramatically reducing recovery time.
Solution Approach 2:
The patent implements rapid dynamic switching between primary and secondary bearers through MAC control elements. The network can activate or deactivate duplication bearers within a single TTI (Transmission Time Interval), enabling fast response to link failures and avoiding prolonged resource allocation delays associated with slower RRC reconfiguration procedures.
Data Source
AI summary
Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a device may determine a deactivation of a duplication bearer for a packet data convergence protocol (PDCP) connection, wherein a first link and a second link are configured for the duplication bearer. The device may schedule data communication for the first link and not for the second link based at least in part on the deactivation of the duplication bearer. Numerous other aspects are provided.