Reduced CID Configuration for OFDMA Burst Allocation Overhead

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Solution Overview

Problem

Conventional mobile communication networks face inefficiencies in data transmission bandwidth and high system overhead due to the need for extensive burst allocation information transmission in IEEE 802.16d standards, particularly when multiple terminals are connected to a base station.

Innovation Solution

A method is introduced to reduce system overhead by using a reduced connection identifier (CID) in broadband wireless communication systems, where the base station selectively applies a reduced CID based on configuration information, allowing terminals to determine the use and length of the reduced CID, thereby minimizing the resources required for burst allocation information transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station transmits complete burst allocation information to each terminal using full CIDs, then each terminal can be accurately identified and receive bursts through the subchannel, but the system overhead increases significantly especially when multiple terminals are connected

Engineering Contradiction:

Improveterminal identification accuracyVSAvoidburst allocation information overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts only the necessary portion of the CID (the most significant bits) that is sufficient to uniquely identify each terminal. Instead of transmitting the complete CID in every MAP_IE, only the extracted significant bits are included in the reduced CID field, reducing the information overhead while maintaining terminal identification capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different CID length requirements to different terminals based on their specific needs. Terminals with lower CID values can use shorter reduced CIDs, while terminals requiring higher identification precision can use longer reduced CIDs or full CIDs. This local optimization reduces overall system overhead while maintaining necessary identification accuracy for each terminal.

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If the base station uses reduced CID in MAP_IE to decrease overhead, then system overhead is reduced and resources are saved, but the ability to accurately identify and allocate resources to each terminal may be compromised

Engineering Contradiction:

Improveburst allocation information overheadVSAvoidterminal identification accuracy

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the parameter of CID length from a fixed value to a variable value. The reduced CID uses only the necessary number of most significant bits from the original CID, and the length of this reduced CID is dynamically adjusted based on the number of connected terminals and their identification requirements. This parameter optimization maintains identification accuracy while minimizing overhead.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial action by including only the essential most significant bits of the CID in the reduced CID field, rather than transmitting the complete CID. This partial information is sufficient for terminal identification and resource allocation, achieving the goal with less information transmission.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If the base station transmits detailed MAP information including UL_MAP and DL_MAP for each frame, then comprehensive burst allocation is achieved, but the transmission bandwidth is consumed and system efficiency decreases

Engineering Contradiction:

Improvechannel allocation managementVSAvoidtransmission bandwidth consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent extracts and transmits only the essential allocation information in the MAP_IE messages using reduced CIDs. By removing redundant information and using compact representations, the necessary channel allocation management is maintained while significantly reducing the bandwidth consumption associated with MAP information transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8391315B2Method and apparatus for constructing MAP IE using reduced CID in broadband OFDMA systems

Publication Date: 2013.03.05 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and mobile subscriber station in a broadband wireless communication system, wherein a receiver receives configuration information including a type field representing a type of a reduced connection identifier (CID) from a base station, and selectively applies the reduced CID based on the type field. The type of the reduced CID is determined based on a range of a basic CID of the mobile subscriber station connected to the base station. The type field includes at least two bits representing one of use of the basic CID and available types of the reduced CID. The available types represent available lengths of the reduced CID, and the reduced CID includes n Least Significant Bits (LSBs) of the basic CID, where n is a positive integer indicated by the type field.