Multicast Service Flow Identification in Broadband Wireless Access
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Solution Overview
Problem
The existing broadband wireless access systems face limitations in supporting multicast communication due to the shortage of unique Multicast Connection Identifiers (MCIDs) and the inability to distinguish between multicast and unicast services effectively, particularly with the IEEE 802.16 standard, which restricts the allocation of MCIDs and lacks adequate identification for Mobile Stations (MS) in multicast services.
Innovation Solution
The proposed solution involves an apparatus and method for a Mobile Station (MS) to receive multicast messages without a separate station identifier, utilizing Enhanced-Multicast and Broadcast Service (E-MBS) service flow information by decoding Multicast Flow Identifier (MFID) of E-MBS Data Information Element (IE) in the E-MBS MAP region, and classifying service groups using a preset number of Station Identifiers (STIDs) for both multicast and unicast services, with a Flow Identifier (FID) to distinguish service types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the conventional MCID allocation method is used, then the system follows the existing specification, but only 94 MCIDs are available which is insufficient for hundreds of channels
Solution Approach 1:
The patent segments the identification system into two parts: STID (Station Identifier) for identifying the Mobile Station and FID (Flow Identifier) for identifying the service flow. This segmentation allows the system to support hundreds of channels by combining a limited number of STIDs with multiple FIDs, effectively expanding the MCID space without requiring a completely new identification mechanism.
Solution Approach 2:
The patent introduces a new dimension to the identification system by adding FID as a secondary identifier. Instead of relying solely on MCID (one-dimensional), the system now uses a two-dimensional identification approach: STID for the station and FID for the flow. This dimensional expansion enables the system to support hundreds of channels while reusing the same STID across different service flows.
2Device complexity
If the system uses a single identifier for both unicast and multicast services, then the identification mechanism is simple, but it cannot distinguish between multicast and unicast services effectively
Solution Approach 1:
The patent segments the identification function into two distinct components: STID for station identification and FID for service flow identification. This segmentation enables the system to maintain relative simplicity in the identification mechanism while achieving precise distinction between unicast and multicast services through the FID component.
Solution Approach 2:
The patent creates a universal identification framework where the combination of STID and FID can serve both unicast and multicast services. The STID universally identifies the Mobile Station regardless of service type, while the FID provides service-specific identification, allowing a single identification mechanism to handle multiple service types effectively.
3Loss of information
If the MS decodes every AAI MAP IE in a subframe, then all information is obtained, but the processing overhead and time consumption increase significantly
Solution Approach 1:
The patent extracts the essential multicast information (E-MBS service flow information and MFID) from the AAI MAP IE and places it in a dedicated E-MBS MAP region. This extraction allows the Mobile Station to obtain only the necessary multicast information without decoding the entire AAI MAP IE, significantly reducing processing overhead while maintaining information completeness for multicast services.
Solution Approach 2:
The patent introduces an intermediary structure (E-MBS MAP region) that mediates between the comprehensive AAI MAP IE and the Mobile Station's information needs. This intermediary contains pre-extracted and organized multicast-specific information, allowing the MS to efficiently obtain required data without processing the full AAI MAP IE, thus reducing time consumption while preserving information integrity.
Data Source
AI summary
An apparatus and a method for supporting multicast communication in a broadband wireless access system are provided. A method of a Mobile Station (MS) for supporting multicast communication in a wireless access system includes acquiring decoding parameters by receiving an Advanced Air Interface Enhanced-Multicast and Broadcast Service configuration (AAI-E-MBS_CFG) message from a Base Station (BS), establishing an E-MBS service flow by sending and receiving AAI Dynamic Service Addition-request/response (AAI_DSA-REQ/RSP) messages to and from the BS, and decoding E-MBS MAP received from the BS through the established E-MBS service flow using the acquired decoding parameters. The E-MBS MAP includes information for decoding multicast bursts.