End Marker for LTE Handover Data Boundary
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Solution Overview
Problem
In next-generation communication systems like LTE, during a handover from a source eNB to a target eNB, the target eNB faces challenges in determining the precise transmission order and timing of source data and target data, leading to inefficiencies in data transmission.
Innovation Solution
The solution involves adding an end marker to the source data, which is transmitted from a Packet Data Network Gateway (PGW) to the source eNB, then forwarded to the target eNB, allowing the target eNB to identify the boundary between source and target data and transmit them accordingly to user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target eNB receives source data and target data separately without clear demarcation, then data transmission can proceed, but the target eNB cannot precisely identify the transmission order and timing
Solution Approach 1:
An end marker is introduced as an intermediary element to clearly demarcate the boundary between source data and target data. This marker serves as a signaling mechanism that enables the target eNB to precisely identify when source data ends and target data begins, thereby determining the exact transmission timing without adding significant system complexity
Solution Approach 2:
The transmission timing information is extracted and separated from the data stream by using a dedicated end marker. Instead of embedding timing information within the data payload, the system extracts the timing indication function into a separate control element (the end marker) that clearly signals the transition point between data sources
2Reliability
If source data is forwarded from source eNB to target eNB during handover, then data continuity is maintained, but the target eNB faces difficulty in determining transmission order
Solution Approach 1:
The end marker acts as a mediator that travels with the source data from the source eNB to the target eNB. This marker provides explicit signaling about the data boundary, making it easy for the target eNB to determine transmission order without complicating the handover forwarding process
Solution Approach 2:
The end marker serves as a visual (signal) change that distinguishes between different data types. By introducing a identifiable marker that changes the signal characteristics at the boundary between source and target data, the system maintains operational simplicity while enabling clear differentiation of data transmission priorities
Data Source
AI summary
A communication system and data transmission method thereof are provided. The method includes adding an end marker to the end of source data and transmitting the source data and the end marker for a Packet data network GateWay (PGW) to a source evolved Node B (eNB) if a handover is carried out from the source eNB to a target eNB while the PGW is transmitting the source data to the source eNB, forwarding the source data and the end marker from the source eNB to the target eNB, transmitting target data immediately following the source data from the PGW to the target eNB, and transmitting the source data and the target data, which is classified into the source data by the end marker and immediately follows the end of the source data, from the target eNB to user equipment.