MAC PDU Parsing with Invalid LCID Handling

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Solution Overview

Problem

Communications devices face errors when processing Media Access Control (MAC) protocol data units (PDUs) due to invalid or reserved logical channel identifiers (LCIDs), leading to parsing failures and subsequent errors in subsequent sub-PDUs.

Innovation Solution

A method and apparatus for parsing MAC PDUs that stop parsing when an invalid or reserved LCID is encountered, reserving successfully parsed sub-PDUs and discarding subsequent sub-PDUs to prevent errors, and sending parsed service data units (SDUs) or control elements to higher layers promptly to optimize storage usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If parsing continues without stopping at invalid LCIDs, then all sub-PDUs are processed, but parsing errors occur and subsequent sub-PDUs cannot be correctly processed

Engineering Contradiction:

Improveparsing correctnessVSAvoidprocessing throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies the skipping principle by detecting an invalid LCID during sequential parsing and immediately stopping further parsing of subsequent sub-PDUs. This prevents the propagation of parsing errors while maintaining processing efficiency by not attempting to parse corrupted data. The parser skips the erroneous path and preserves already successfully parsed sub-PDUs.

Inventive Principle:

Principle #21Skipping (Rushing through)

2Productivity

If all sub-PDUs are parsed regardless of errors, then processing is completed, but error propagation occurs affecting subsequent sub-PDUs

Engineering Contradiction:

Improveprocessing completionVSAvoiddata integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements beforehand cushioning by introducing an error detection mechanism that identifies invalid LCIDs before they can cause cascading parsing errors. When an invalid LCID is detected, the parser immediately stops processing and preserves the state of successfully parsed sub-PDUs, preventing error propagation to subsequent sub-PDUs while maintaining overall processing completion.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Quantity of substance

If parsed SDUs are held in storage until end of parsing, then data is available for processing, but storage occupancy increases

Engineering Contradiction:

Improvestorage occupancyVSAvoidprocessing delay

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent applies preliminary action by immediately sending successfully parsed SDUs and control elements to higher layers as soon as parsing is complete, rather than holding them in storage until the entire MAC PDU parsing is finished. This reduces storage occupancy while ensuring data is promptly available for higher layer processing, eliminating unnecessary delays.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11477307B2Media access control protocol data unit processing method and apparatus

Publication Date: 2022.10.18 HUAWEI TECH CO LTD

AI summary

A Media Access Control (MAC) protocol data unit processing method includes: obtaining a MAC protocol data unit (PDU), wherein the MAC PDU includes N sub-PDUs, each sub-PDU includes a logical channel identifier (LCID), the N sub-PDUs are arranged in a first sequence, and N is a positive integer; parsing the N sub-PDUs according to the first sequence, and when a first sub-PDU is parsed, stopping the parsing and reserving a parsed second sub-PDU, wherein the second sub-PDU includes at least one sub-PDU before the first sub-PDU in the N sub-PDUs in the first sequence, and a value of an LCID included in the first sub-PDU is a specified reserved value. In this way, a manner for processing a MAC PDU can be provided when a value of an LCID is an invalid value or a reserved value.