Anycast Session Re-Scheduling via Client Calibration Requests
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Solution Overview
Problem
Existing service-based architectures face challenges in reassigning communication sessions due to built-up communication states, preventing efficient mobility of service transactions when current instances become non-optimal, such as being overloaded or experiencing high latency.
Innovation Solution
A client device initiates a calibration request message to a routing device for re-establishing an anycast communication session, using triggers like handover or latency measurements, and receives a response to switch to a more optimal service instance, allowing for zero or one round trip time transaction mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a service client maintains an ongoing communication session with a serving service instance, then communication state is built up ensuring session continuity, but the client cannot switch to a more optimal service instance even when the current instance becomes overloaded or experiences high latency
Solution Approach 1:
The patent implements dynamic service instance selection by introducing a calibration mechanism that allows clients to transition from static affinity-based routing to dynamic optimal instance selection. The calibration request message enables the client to probe for better instances while maintaining session state, allowing the system to adapt instance assignments based on current network conditions and instance performance rather than being locked into a single serving instance.
Solution Approach 2:
The patent applies preliminary action by performing calibration requests before fully committing to a new service instance. The client can probe the network for optimal instances and receive calibration responses with recommended instance addresses before actually switching sessions, allowing advance preparation for instance transitions while maintaining session continuity during the probe phase.
2Productivity
If the system allows service instance re-assignment based on performance metrics, then optimal service delivery is improved, but the built-up communication state prevents such re-assignment
Solution Approach 1:
The patent introduces an intermediary calibration mechanism that mediates between the client's need for optimal instance selection and the network's requirement for session continuity. The calibration request/response messages act as intermediaries that carry instance selection information without requiring complex state transfer protocols, simplifying the transaction mobility process while enabling performance-based re-assignment.
Solution Approach 2:
The patent segments the instance selection process into distinct phases: initial service request, calibration probing phase, and session establishment phase. By separating the probing/calibration step from the actual session transfer, the system reduces complexity by handling instance selection and session state management as independent operations rather than requiring complex integrated protocols.
3Stability of the object's composition
If the client sends affinity requests to maintain session state, then communication continuity is ensured, but latency increases when needing to switch to a better service instance
Solution Approach 1:
The patent reduces switching time by performing calibration requests in advance before actual instance transitions are needed. The client can periodically probe for optimal instances and receive calibration responses ahead of time, so when a switch is actually required, the decision is already made and only the session re-establishment is needed, rather than performing discovery and selection during the switch event itself.
Solution Approach 2:
The patent enables rapid instance switching by skipping complex state transfer protocols. The calibration mechanism provides direct instance recommendations without requiring lengthy state synchronization between instances, allowing the client to quickly re-establish sessions with new instances by simply sending affinity requests to the recommended addresses rather than undergoing complex handoff procedures.
Data Source
AI summary
Disclosed are a client device, a routing device and a server device for re-establishing an anycast communication session with a service function (SF) and corresponding methods of operating the same. The client device comprises a processor, being configured to: obtain a trigger for the re-establishing of the anycast communication session; send a calibration request message (CREQ) to a routing device being adjacent to the client device; and receive a calibration response message (CRES) from the routing device. The CREQ comprises the identifier (SID) of the SF, a locator address (IPC) of the client device, and a locator address (IPS) of a particular server device of the SF currently serving the client device. The CRES comprises the SID of the SF, the IPC, and a locator address (IPS′) of a specific server device of the SF prospectively serving the client device.