EMBMS Access Gateway IP Multicast Protocol Architecture
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Solution Overview
Problem
Current SAE/LTE network architectures lack defined protocol architecture for IP multicast on the S1 interface, leading to inefficiencies in transmitting MBMS service data from access gateways to base stations, with issues such as eNBs not receiving necessary MBMS Session Start messages, affecting multicast service delivery.
Innovation Solution
An Evolved Multimedia Broadcast/Multicast Service (EMBMS) access gateway and base station supporting IP multicast, which includes receiving/responding means, storage for mapping relationships, determining means for base station association, and transmitting means to efficiently deliver MBMS Session Start messages and data using IP multicast packets, ensuring accurate distribution to relevant base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IP multicast is introduced into EMBMS architecture, then MBMS service data transmission efficiency is improved, but protocol architecture definition and implementation complexity increases
Solution Approach 1:
The patent changes the transmission protocol parameter from traditional GTP unicast to IP multicast, enabling efficient one-to-many data distribution. This parameter change allows MBMS service data to be transmitted to multiple eNBs simultaneously through a single multicast stream, dramatically improving transmission efficiency while the patent simultaneously provides detailed protocol architecture definitions to manage the complexity of this change
2Area of stationary object
If MBMS Session Start messages are transmitted to all eNBs in service area, then service coverage is improved, but message transmission overhead and network load increase
Solution Approach 1:
The patent extracts and utilizes the multicast group membership information from eNBs to determine selective message routing. Instead of blindly transmitting to all eNBs in the service area, the system extracts the subset of eNBs that have actually joined the multicast group for that service, thereby reducing message overhead while maintaining complete service coverage for all interested users
Solution Approach 2:
The patent implements a feedback mechanism where eNBs proactively send multicast group membership information to the access gateway. This feedback allows the gateway to intelligently determine which eNBs should receive MBMS Session Start messages based on actual service interest, optimizing the balance between coverage and overhead
Data Source
AI summary
The present invention provides an Evolved Multimedia Broadcast/Multicast Service (EMBMS) access gateway supporting network multicast, comprising: receiving/responding means for receiving a Multimedia Broadcast/Multicast Service (MBMS) Session Start message from a Broadcast/Multicast-Service Center (BM-SC) and for returning a response message to the BM-SC after receiving the MBMS Session Start message; storage means for storing a mapping relationship between respective MBMS service areas (SAs) and respective base stations; determining means for determining base station(s) associated with the MBMS based on the stored mapping relationship when the receiving/responding means receives the MBMS Session Start message; and transmitting means for transmitting the MBMS Session Start message to the determined bases station(s).