MAC PDU Header Compression via CID Segmentation

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Solution Overview

Problem

IEEE 802.16 wireless communication systems transmit redundant headers and control information, leading to increased system overhead and reduced throughput.

Innovation Solution

The system reduces overhead by dividing the connection identifier (CID) into two parts, optimizing MAC PDU headers, and using a connection index instead of a full CID, thereby minimizing unnecessary header information transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If full CID is transmitted in every MAC PDU header, then connection identification accuracy is improved, but system overhead increases and throughput decreases

Engineering Contradiction:

Improveconnection identification accuracyVSAvoidsystem throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The 16-bit CID is divided into two parts: CID part 1 (most significant bits) is carried in the MAP IE, and CID part 2 (least significant bits) is carried in the MAC PDU header. This segmentation allows the full CID to be transmitted across multiple locations, maintaining identification accuracy while reducing the header size of each individual MAC PDU.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

CID part 1 is extracted from the MAC PDU header and placed in the MAP IE. This extraction removes redundant information from the header, reducing overhead while the complete CID information is still available through combination with MAP IE data.

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of information

If redundant headers and control information are transmitted, then control information completeness is improved, but system overhead increases and throughput decreases

Engineering Contradiction:

Improvecontrol information completenessVSAvoidsystem throughput

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The MAC PDU header is merged with the MAP IE to form a combined header structure. This merging eliminates redundant control information by integrating the function of both headers into a single unified structure, reducing total overhead while maintaining all necessary control information.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Redundant control information is extracted from the MAC PDU header and consolidated into the MAP IE. This extraction removes duplicate data while preserving all essential control functions through the streamlined header structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP2198542B1Reducing system message overhead

Publication Date: 2019.05.08 HMD GLOBAL

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AI summary

System throughput is improved by decreasing the system overhead by reducing the size of control packets and data packet headers. A connection identifier (CID) is divided into a CID part 1 carried on a MAP IE and a CID part 2 carried on the generic MAC-PDU headers of one or more MAC PDUs. Versions of RCID-IE() in MAP messages may used to represent CID parti. The generic MAX PDU headers (GMH) may vary according to the length of CID part 1, and multiple GMHs in a PHY burst may have different CID parts 2. In addition, the type header field of the GMH may be shortened or removed. Alternatively, a modified GMH may have an extended type sub-header field. In addition, the GMH may use a shorter connection index or a connection index mask instead of a CID.