SDAP Header Editing for Uplink Data Ordering During DRB Release
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Solution Overview
Problem
In wireless communication networks, particularly in 5G networks, there is a challenge in avoiding out-of-order uplink data reception when a data radio bearer (DRB) is released, handover occurs to another DRB, or a quality of service (QoS) flow is added.
Innovation Solution
A method is provided where a user equipment (UE) obtains an indication of DRB release or handover, edits service data adaptation protocol (SDAP) headers of uplink protocol data units (PDUs) in the transmission buffer based on configuration differences between the old and new DRBs, and transmits the edited PDUs via the new DRB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a DRB is released or handed over to another DRB, then network resource utilization is improved, but uplink data reception order deteriorates causing out-of-order delivery
Solution Approach 1:
The patent applies preliminary action by editing SDAP headers of uplink PDUs in the transmission buffer before the DRB release or handover occurs. By proactively modifying the headers to reflect the new DRB configuration, the system ensures that data packets maintain correct ordering information throughout the transition, preventing out-of-order delivery while enabling network resource optimization.
2Reliability
If SDAP headers are edited based on configuration differences, then data integrity is maintained, but processing complexity increases
Solution Approach 1:
The patent applies local quality by editing only the specific SDAP header fields that differ between the old and new DRB configurations, rather than reprocessing entire headers or all PDUs. This targeted approach maintains data integrity by preserving correct ordering information while minimizing processing complexity through selective modification of only the necessary header elements.
3Productivity
If uplink PDUs are transmitted via the new DRB, then resource efficiency is improved, but packet loss risk increases during transition
Solution Approach 1:
The patent uses the edited SDAP header as an intermediary that carries forwarding indication information through the transmission buffer. This intermediary mechanism enables seamless transition from the old DRB to the new DRB by providing explicit routing instructions in the header, ensuring packets are transmitted efficiently via the new DRB while maintaining delivery reliability through proper forwarding guidance.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for avoiding out of order uplink data reception upon data radio bearer (DRB) release or quality of service (QoS) flow addition. An exemplary method that may be performed by a user equipment (UE), includes obtaining an indication that a first data radio bearer (DRB) is released or handed over to a second DRB, wherein a first mapping maps a first quality of service (QoS) flow to the first DRB; obtaining a second mapping that maps the first QoS flow to a second DRB; editing service data adaptation protocol (SDAP) headers of uplink protocol data units (PDUs) in an uplink transmission buffer associated with the first DRB, based on a difference between a first configuration of the first DRB and a second configuration of the second DRB; and transmitting the uplink PDUs via the second DRB.