IuGW RTP Localization for Backhaul Bandwidth Reduction
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Solution Overview
Problem
In 3G Universal Mobile Telecommunications System (UMTS) networks, voice calls between mobile subscribers camped on the same base station result in inefficient use of backhaul bandwidth and resource blocking due to signaling and RTP messages flowing through the core network, leading to inefficiencies in radio network controllers and core networks.
Innovation Solution
A method involving a coordinating server that receives setup messages for user equipment (UE) initiating voice calls, creates call correlation identifiers, determines RTP localization status, and sends transport layer assignment messages to redirect RTP packets between UEs without transiting the core network, allowing local switching of RTP packets within the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RTP packets are routed through the core network for voice calls between UEs on the same base station, then call connectivity is ensured, but backhaul bandwidth is wasted and core network resources are blocked
Solution Approach 1:
The patent extracts the RTP packet routing function from the core network path and relocates it to the base station level. The coordinating server identifies calls where both UEs are served by the same base station and redirects the RTP traffic flow to bypass the core network, extracting only the necessary signaling traffic while localizing the media traffic at the access network level.
Solution Approach 2:
The coordinating server acts as an intermediary between the base station and the core network. It receives setup messages from the base station, determines RTP localization status by checking if both UEs are on the same base station, and sends transport layer assignment messages to redirect RTP packets through the appropriate base station without transiting the core network.
2Loss of time
If RTP packets are routed through the core network, then call establishment is simple, but latency increases and resources are blocked
Solution Approach 1:
The patent performs preliminary action by determining the RTP localization status during the call setup phase. The coordinating server checks whether both UEs are served by the same base station before RTP traffic is generated, and pre-configures the appropriate routing path through transport layer assignment messages, avoiding the need for dynamic rerouting during active calls.
3Ease of operation
If all voice call traffic is routed through the core network, then network management is simplified, but backhaul bandwidth is inefficiently used
Solution Approach 1:
The patent applies local quality by treating different call scenarios differently based on UE location. For calls where both UEs are on the same base station, RTP traffic is localized at the base station level. For other scenarios, traffic continues to flow through the core network. This selective localization optimizes backhaul bandwidth usage while maintaining simplified core network management for non-localized calls.
Data Source
AI summary
A method for localizing a voice call is disclosed, comprising: receiving an originating leg setup message for an originating leg bearer from the first base station for a first user equipment (UE); creating a first call correlation identifier and storing the first call correlation identifier in association with the first UE; extracting a second call correlation identifier from a terminating leg setup message for a terminating leg bearer received from the core network; determining a real time protocol (RTP) localization status for the originating leg bearer and the terminating leg bearer based on matching the second call correlation identifier of the terminating leg against the stored first call correlation identifier of the originating leg; and sending transport layer assignment messages to the first base station to redirect RTP packets from the first UE to the second UE via the terminating leg bearer without the RTP packets transiting the core network.