Handling Unknown LCID Values in LTE Multicast Channels

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Solution Overview

Problem

In wireless communication systems, particularly in LTE, handling unknown LCID values in Multicast Channels is not adequately addressed, leading to inefficiencies and potential errors in data processing.

Innovation Solution

User Equipment (UE) is designed to ignore fields and corresponding parts of MAC PDUs containing unknown LCID values when received on a Multicast Channel, thereby bypassing unknown or unconfigured logical channel identifiers and ensuring proper processing of other data components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE processes all received MAC PDUs on Multicast Channel, then complete data reception is achieved, but processing errors occur when unknown LCID values are encountered

Engineering Contradiction:

Improvedata processing reliabilityVSAvoiddata processing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts and removes MAC PDU segments containing unknown LCID values from the data stream. When the UE encounters an unknown LCID, it identifies the problematic segment, extracts it from the MAC PDU, and processes only the valid portions, thereby preventing errors while maintaining overall processing efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the MAC PDU processing into independent units based on LCID values. Each MAC PDU is divided into processable segments, and segments containing unknown LCIDs are handled separately from valid segments, allowing the UE to process valid data while ignoring problematic portions.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the UE ignores fields with unknown LCID values, then processing errors are prevented, but data loss occurs in those specific fields

Engineering Contradiction:

Improveprocessing reliabilityVSAvoiddata loss

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent converts the harmful effect of unknown LCID values into a beneficial filtering mechanism. By identifying and ignoring only the specific fields containing unknown LCIDs, the system transforms potential errors into a selective filtering process that preserves all valid data while automatically discarding only the problematic segments.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Loss of information

If the UE requests retransmission for unknown LCID values, then data completeness is improved, but system overhead and latency increase

Engineering Contradiction:

Improvedata completenessVSAvoidprocessing latency

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent applies partial action by processing only the necessary portions of MAC PDUs. Instead of requesting retransmission for entire MAC PDUs or waiting for complete data sets, the UE processes available valid data immediately and selectively ignores unknown LCID fields, achieving sufficient data completeness without excessive retransmission overhead or latency.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10374817B2Method for handling of unknown LCID values in a multicast channel in a wireless communication system and a device therefor

Publication Date: 2019.08.06 LG ELECTRONICS INC

AI summary

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for handling of unknown LCID values in a Multicast Channel in a wireless communication system, the method comprising: receiving a MAC PDU including at least one LCID on MCH; discarding a header field containing a first LCID and a corresponding MAC SDU indicated by the header field in the received MAC PDU if the UE does not join an MBMS service transmitted on a MTCH identified by the first LCID currently; and processing remaining parts of the MAC PDU after the header field and the corresponding MAC SDU are discarded from the MAC PDU.