MBS Synchronization Rule for WiMAX Macro Diversity
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Solution Overview
Problem
Current IEEE 802.16/WiMAX systems lack a detailed procedure for multicast and broadcast services, particularly in supporting macro diversity and efficiently managing synchronization and data loss in multicast and broadcast service zones.
Innovation Solution
A multicast and broadcast service system and method that includes transmitting an MBS Synchronization Rule to Base Stations, using GRE SN for data packet sequencing, and retransmitting missing data packets to ensure synchronization and data integrity, leveraging the ASN-Gateway for recovery requests and data distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MBS Synchronization Rule is transmitted to all base stations to support macro diversity, then service stability is improved, but data loss occurs during transmission
Solution Approach 1:
The patent applies preliminary action by accumulating MBS data packets in the ASN-GW before transmission to base stations. This buffering approach allows the system to prepare data in advance and handle potential transmission losses by having ready-to-retransmit packets, thus improving reliability while managing data loss risks.
Solution Approach 2:
The patent implements feedback mechanisms through recovery request procedures. When data loss is detected at base stations or mobile stations, recovery requests are sent back to the ASN-GW, which then retransmits the missing MBS data packets. This feedback loop ensures service stability by correcting transmission errors.
2Reliability
If GRE SN is included in MBS Synchronization Rule for data packet sequencing, then data integrity is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by using GRE SN (Generic Routing Encapsulation Sequence Number) as a multi-functional element. The GRE SN serves both as an identifier for data packets and as a sequencing mechanism for detecting data loss and managing retransmissions. This single element performs multiple functions, improving data integrity without proportionally increasing system complexity.
3Measurement precision
If MBS data packets are accumulated during predetermined period, then synchronization accuracy is improved, but transmission delay increases
Solution Approach 1:
The patent applies dynamics by making the data accumulation period adjustable rather than fixed. The ASN-GW can adapt the predetermined accumulation period based on network conditions, service requirements, and synchronization needs. This dynamic approach allows optimization between synchronization accuracy and transmission delay depending on current operational requirements.
Data Source
AI summary
The present invention relates to a multicast and broadcast service (MCBCS) system and method. According to the present invention, the MCBCS system comprises: an MBS distribution DPF (Data Patch Function) for receiving MBS data from an MCBCS server/controller and distributing the data; an MBS synchronization controller for acquiring GRE (Generic Routing Encapsulation) for the MBS data from the MBS distribution DPF and then generating an MBS synchronization rule; an MBS synchronization executor for executing MBS synchronization on the MBS synchronization rule received from the MBS synchronization controller; and an MBS DPF for receiving MBS data from the MBS distribution DPF, packaging the MBS data into an MBS burst and then transmitting the data to an MS (Mobile station). As such, multicast and broadcast services can be provided efficiently.