MAC PDU Segmentation for Sidelink Data Duplication
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Solution Overview
Problem
In wireless communications, when user equipment (UE) activates the sidelink data duplication function, reserved LCID values cause packet loss in R14 UE, leading to decreased data reception performance due to discarding of entire MAC PDUs by R14 UE, which does not support sidelink packet duplication.
Innovation Solution
Implement a method where user equipment determines if a received MAC PDU contains a reserved LCID value and discards only the corresponding SDU or sub-PDU, while sending data in separate MAC PDUs when associated with reserved and non-reserved LCID values, ensuring that only the reserved data is discarded and not the entire packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If R14 UE discards entire MAC PDU when detecting reserved LCID value, then protocol compliance is maintained, but data reception performance decreases due to packet loss
Solution Approach 1:
The patent segments the MAC PDU into multiple sub-PDUs, each associated with a specific LCID value. When a reserved LCID value is detected, only the corresponding sub-PDU is discarded rather than the entire MAC PDU. This segmentation allows selective discarding of harmful portions while preserving useful data in other sub-PDUs, directly resolving the contradiction between protocol compliance and data reception performance.
2Reliability
If sidelink data duplication function is activated with reserved LCID values, then data reliability is improved through duplication, but backward compatibility deteriorates as R14 UE cannot receive duplicated packets
Solution Approach 1:
The patent applies local quality by making the discarding behavior specific to the LCID value rather than uniform across all data. R14 UE identifies sub-PDUs with reserved LCID values and discards only those specific portions, while accepting sub-PDUs with valid LCID values. This localized approach maintains backward compatibility for non-duplicated data while allowing R15 UE to utilize duplication functionality with reserved LCID values.
Data Source
AI summary
This disclosure provides a data sending method and receiving method, and user equipment thereof, and relates to the field of communications technologies. The data receiving method applied to user equipment includes: determining whether a Medium Access Cntrol (MAC) Protocol Data Unit (PDU) received by the user equipment includes a reserved Logical Channel Identity (LCID) value; and when the MAC PDU includes a reserved LCID value, discarding a Service Data Unit (SDU) or sub-PDU corresponding to the reserved LCID value in the MAC PDU.