Uplink Data Transmission via PDCP SN Mapping
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Solution Overview
Problem
In 5G NR networks, the overhead of QoS flow IDs in uplink data transmission is excessive, leading to inefficient data transmission due to the need for these IDs to be carried on each packet, which can impact other services by reducing available network resources.
Innovation Solution
A preset mapping relationship between PDCP SN and QoS flow ID is established, allowing the terminal and network side device to query this relationship instead of carrying the QoS flow ID on each packet, thereby reducing overhead and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If QoS flow ID is carried on each uplink data packet, then the QoS flow mapping can be accurately identified, but the overhead of uplink data increases and network resources are wasted
Solution Approach 1:
The patent extracts the QoS flow identification function from the data packet payload and relocates it to the PDCP layer through implicit mapping. The QoS flow ID is no longer carried in each packet but is instead determined by the PDCP SN through pre-configured mapping relationships, thereby removing the overhead while preserving identification accuracy.
Solution Approach 2:
The patent introduces PDCP SN as an intermediary element that mediates between the physical packet transmission and QoS flow identification. The PDCP SN serves as a reference that indirectly indicates the QoS flow ID through mapping relationships configured by the network, eliminating the need to transmit QoS flow ID directly in each packet.
2Reliability
If QoS flow ID is included in each packet, then the QoS mapping function is complete, but the uplink data transmission efficiency decreases
Solution Approach 1:
The patent performs preliminary configuration of QoS flow mapping relationships before actual data transmission. The network configures the mapping between PDCP SN and QoS flow ID in advance, so that during uplink transmission, the terminal only needs to apply the pre-established mapping rule without performing complex real-time mapping decisions, thus improving transmission efficiency while maintaining mapping completeness.
3Measurement precision
If QoS flow ID is carried on every packet, then each packet can be correctly routed to the appropriate QoS flow, but the available network bandwidth for other services is reduced
Solution Approach 1:
The patent extracts the QoS flow identification information from the packet payload and implements it at the PDCP layer using PDCP SN-based implicit mapping. This removes the QoS flow ID overhead from each packet, freeing up network bandwidth for actual data transmission while maintaining accurate packet routing through the pre-configured mapping relationships.
Data Source
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AI summary
Disclosed are an uplink data transmission method, a terminal, a network side device and a system. The method comprises: a terminal transmitting uplink data, wherein a packet data convergence protocol (PDCP) serial number (SN) of each data packet in the uplink data corresponds to a quality of service flow identifier (QoS flow ID) in a pre-set mapping relationship. The embodiments of the present invention are favourable for reducing the overheads of a QoS flow ID of uplink data and improving the transmission efficiency of the uplink data.