Proxy Presence Server Caching for RCS Load Reduction

The patent introduces a proxy presence server as an intermediary component between RCS clients and the internal presence server. This proxy server receives presence information queries from RCS clients, caches the information locally, and serves subsequent queries from its cache without forwarding them to the internal presence server. This mediator architecture maintains accurate presence information delivery while protecting the internal server from overload by poorly configured clients that continuously query presence status.

The proxy presence server performs preliminary actions by caching presence information received from the internal presence server with a configurable Time-To-Live (TTL) value. When queries arrive, the server checks its cache first and serves information from the cache if it is still valid (within TTL), avoiding real-time queries to the internal server. This preliminary caching action improves query response efficiency while the configurable TTL mechanism ensures information freshness by invalidating cache entries after a specified duration.

The patent applies segmentation by dividing the presence server functionality into two distinct components: the internal presence server that maintains authoritative presence information and the proxy presence server that handles client queries with local caching. This segmentation allows the system to prevent inter-carrier communication overload by distributing the query handling responsibility, while the added complexity is confined to the proxy layer without affecting the core internal server architecture.