Dynamic PCC–PCE Capability Negotiation Without Session Reestablishment
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Solution Overview
Problem
Current capability negotiation processes between a path computation client (PCC) and a path computation element (PCE) are inefficient and burdensome, requiring complex renegotiations when capabilities change, leading to increased load on both entities.
Innovation Solution
A method for dynamic capability negotiation that allows network entities to update capabilities within an existing negotiation session without disconnecting or re-establishing the session, using messages like PCEP open and PCNtf to facilitate efficient renegotiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If capability renegotiation is performed by disconnecting and re-establishing the negotiation session, then the capability update can be completed, but the negotiation efficiency decreases and load increases
Solution Approach 1:
The patent transforms the static capability negotiation session into a dynamic one that can adapt to capability changes without termination. The negotiation session becomes flexible and can accommodate capability updates mid-session, resolving the contradiction between maintaining session continuity and updating capabilities.
Solution Approach 2:
The patent changes the parameter of session state from fixed to mutable, allowing the negotiation session to transition between different capability states. This enables capability parameters to be modified during the session without requiring session re-establishment, thereby improving negotiation efficiency while reducing process complexity.
2Adaptability or versatility
If capability negotiation session is re-established for capability updates, then capability changes can be implemented, but time is lost due to session setup overhead
Solution Approach 1:
The patent ensures continuous capability negotiation by maintaining the session state throughout the update process. Instead of interrupting the negotiation flow to re-establish sessions, the useful action of capability negotiation continues uninterrupted, allowing capability changes to be implemented seamlessly without time loss.
Solution Approach 2:
The patent performs preliminary preparation for capability updates by maintaining session context and capability state information in advance. This preliminary action enables rapid capability updates without requiring full session re-establishment, reducing the time required for capability changes while maintaining adaptability.
3Adaptability or versatility
If complex renegotiation process is used for capability changes, then capability updates can be achieved, but load on PCC and PCE increases
Solution Approach 1:
The patent extracts the essential capability update function from the complex session re-establishment process. By separating the capability update operation from the full negotiation protocol, only the necessary capability parameters are updated rather than re-negotiating the entire session, thereby reducing processing load while maintaining capability adaptability.
Solution Approach 2:
The patent segments the capability negotiation process into independent capability elements that can be updated individually. Instead of re-negotiating all capabilities when one changes, only the specific capability element requiring update is modified, reducing the overall processing load while preserving the ability to modify capabilities as needed.
Data Source
AI summary
A method, an apparatus, and a system for capability negotiation, and a storage medium, and relates to the communication field. The method includes: a first network entity obtains a capability update message, where the capability update message includes capability update information, and the capability update information indicates at least one capability to be updated of the first network entity. The first network entity sends the capability update message to the second network entity based on a capability negotiation session established between the first network entity and a second network entity. The embodiments can simplify a process of capability negotiation, thereby improving efficiency of capability negotiation, achieving dynamic negotiation of a capability, and reducing load of a PCC and a PCE.