L2 Layer Data Packet Processing for Low Latency

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Solution Overview

Problem

Current L2 layer processing in LTE communication systems is complex and inefficient, leading to high user plane latency due to the need for real-time segmentation and concatenation of data packets after receiving an uplink grant, which hinders the achievement of low latency targets in 5G NR communication systems.

Innovation Solution

Implementing real-time segmentation at the lowest L2 sublayer and non-real-time segmentation or concatenation at the higher L2 sublayer to minimize processing time and header overhead, allowing for pre-generation of RLC and MAC PDUs before the uplink grant, and configuring logical channels with flexible header designs for multiplexing and demultiplexing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If real-time segmentation and concatenation of data packets is performed after receiving uplink grant in current L2 layer processing, then data packets can be properly formatted for transmission, but processing complexity increases and user plane latency increases

Engineering Contradiction:

Improvedata packet formatting accuracyVSAvoidL2 layer processing complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by generating RLC and MAC PDUs before receiving the uplink grant. The L2 layer performs segmentation, concatenation, and PDU generation in advance, so that when the uplink grant is received, the data is already formatted and ready for immediate transmission, eliminating the need for complex real-time processing.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

Engineering Contradiction:

Improvedata packet formatting accuracyVSAvoiduser plane latency

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies skipping by eliminating the real-time segmentation and concatenation steps that would normally occur after receiving the uplink grant. By performing these operations beforehand, the system skips the time-consuming real-time processing phase, allowing for much faster transmission response.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Reliability

If logical channel prioritization procedure is performed after receiving uplink grant in current L2 layer processing, then QoS requirements can be met, but processing time increases and user plane latency increases

Engineering Contradiction:

ImproveQoS requirement fulfillmentVSAvoiduser plane latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing logical channel prioritization (LCP) before receiving the uplink grant. The L2 layer determines the priority ordering of logical channels and prepares the data structure in advance, so that when the grant is received, the data is already organized according to QoS requirements, eliminating the need for time-consuming real-time LCP execution.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If RLC and MAC PDUs are generated after receiving uplink grant in current L2 layer processing, then data transmission can occur, but response time increases

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidresponse time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by generating RLC and MAC PDUs before receiving the uplink grant. This allows the system to have data ready for immediate transmission as soon as the grant is received, significantly reducing the response time while maintaining full data transmission capability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10250725B2Method of L2 layer data packet processing and electronic device using the same

Publication Date: 2019.04.02 ACER INC

AI summary

In an aspect, the disclosure is directed to a method and device for generating, by a higher L2 sublayer before receiving an UL grant, PDUs of the higher L2 sublayer, wherein each PDU of the higher L2 sublayer includes one or more SDUs of the higher L2 sublayer; generating, by a lowest L2 sublayer before receiving the UL grant, subheaders for each of SDUs of the lowest L2 sublayer, wherein each SDU of the lowest L2 sublayer is equivalent to each PDU of the higher L2 sublayer; performing, by the lowest L2 sublayer, a LCP procedure for the SDUs in response to receiving the UL grant; and generating, by the lowest L2 sublayer based on a result of the LCP procedure, a PDU of the lowest L2 sublayer by multiplexing a portion of the SDUs of the lowest L2 sublayer and the subheaders of the portion of the SDUs.