SRv6 BIER Extension for Multicast in RAN and PC
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Solution Overview
Problem
Segment routed networks face limitations in multicast/Point-to-Multipoint (P2MP) data delivery functionality, which hinders efficient data distribution in modern mobile networks.
Innovation Solution
The implementation of a Bit-Index-6 (BI6) format in IPv6, which includes a bitstring for addressing egress routers in a Bit Index Explicit Replication (BIER) subdomain, enables efficient P2MP data delivery by encoding Segment IDs (SIDs) and using a Function bit and Argument bit as Last Significant Bits (LSBs) in the IPv6 address.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional GTP-based forwarding is used in mobile networks, then application layer forwarding is required, but this increases network complexity and reduces forwarding efficiency
Solution Approach 1:
The patent replaces application-layer software forwarding with hardware-based segment routing forwarding using IPv6 headers and BIER bitstrings. The mechanical substitution occurs by moving forwarding logic from application-layer processing to network-layer hardware forwarding planes, enabling zero-packet-drop performance while reducing overall network complexity through standardized protocol handling
Solution Approach 2:
The patent implements universal P2MP forwarding capability that can handle multiple application types (surveillance, traffic management, mobile TV, machine-to-machine communications) through a single unified segment routing infrastructure. The BIER bitstring mechanism provides multi-functional support for different multicast scenarios without requiring application-specific forwarding logic
2Adaptability or versatility
If segment routing is implemented without P2MP support, then unicast routing is used, but this limits functionality for multicast applications
Solution Approach 1:
The patent merges unicast segment routing with multicast BIER forwarding by combining IPv6 segment routing headers with BIER bitstrings in a unified packet format. This integration allows packets to carry both segment routing path information and multicast group identification, enabling reliable P2MP delivery while maintaining segment routing's fast rerouting capabilities
Solution Approach 2:
The patent segments the routing information into distinct components: the Segment Routing Header contains path routing information, while the BIER bitstring contains multicast group membership information. This segmentation allows independent optimization of unicast path selection and multicast group delivery, enhancing both adaptability and reliability
3Adaptability or versatility
If MBMS extensions are used for multicast, then vendor support is limited and use-cases are restricted, but broader multicast support is needed for 5g+ applications
Solution Approach 1:
The patent implements a universal P2MP forwarding mechanism based on standard IPv6 segment routing and BIER protocols that can support diverse 5g+ applications including machine-to-machine communications, mobile TV, and surveillance. This universal approach avoids vendor-specific extensions and leverages widely-deployed segment routing infrastructure already present in production networks
Solution Approach 2:
The patent changes the fundamental parameters of multicast forwarding by using IPv6 addresses and BIER bitstrings instead of traditional MBMS protocol parameters. This parameter change enables compatibility with existing segment routing equipment and simplifies vendor implementation by reusing established protocols rather than requiring new vendor-specific software stacks
4Ease of operation
If service chaining is implemented for user equipment traffic, then traffic must traverse multiple service nodes, but this increases latency and reduces delivery speed
Solution Approach 1:
The patent implements preliminary routing by encoding the complete service chain path in the Segment Routing Header before packet transmission. Each service node's segment ID is pre-configured in the SRH, allowing routers to perform simple header matching and forwarding without per-packet service chain computation, thereby maintaining fast delivery speeds while enabling complex service chaining
Data Source
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AI summary
Point-to-Multipoint (p2mp) delivery of data in a SRv6 network for multicast/p2mp data delivery. Function and Argument bits are encoded Segment Routing (SRv6) as a Last Significant Bit in an IPv6 address. An SRv6 node can be encoded with a Segment ID to tunnel multicast through a node that does not support Bit Index Explicit Replication (BIER) SRv6 forwarding.