Bearer Path Optimization via Local MS Gateway Routing
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Solution Overview
Problem
There is a need for a technique to efficiently support calls over both circuit-switched and multimedia subsystems while optimizing the bearer path, particularly when the visited CS is located at a relatively long distance from the home MS, leading to backhaul inefficiencies in routing the bearer path.
Innovation Solution
The solution involves anchoring call control for originating, terminating, and transferring calls at a Continuity Control Function (CCF) in the home MS, which selectively routes the bearer path through a local MS if it is more proximate to the visited CS, thereby reducing the length of the Time Division Multiplexed (TDM) portion of the bearer path by using a media gateway in the local MS instead of the home MS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the bearer path is routed through the home MS media gateway, then centralized call control is maintained, but the bearer path length increases causing backhaul inefficiencies
Solution Approach 1:
The patent introduces a local MS as an intermediary node between the visited CS and the home MS. The local MS media gateway handles the TDM portion of the bearer path locally, acting as a mediator that reduces the distance signals must travel through the backhaul network, thereby improving efficiency while maintaining centralized control through the home MS CCF.
Solution Approach 2:
The bearer path is segmented into two distinct portions: a TDM portion handled by the local MS media gateway and a packet portion handled by the home MS media gateway. This segmentation allows each portion to be optimized independently - the TDM portion is routed locally to reduce backhaul inefficiencies, while the packet portion maintains centralized control through the home MS.
2Productivity
If the bearer path is routed through the local MS, then backhaul inefficiencies are reduced, but centralized call control may be compromised
Solution Approach 1:
The patent segments the bearer path into TDM and packet portions, with the TDM portion routed through the local MS for efficiency and the packet portion maintained through the home MS for centralized control. This segmentation allows both objectives to be achieved simultaneously - improved routing efficiency and maintained control reliability.
Solution Approach 2:
The local MS acts as an intermediary for the TDM bearer path portion, handling local routing efficiently while the home MS CCF remains the ultimate controller for the packet portion and overall call management, thus maintaining reliability through centralized control while achieving efficiency gains.
3Loss of energy
If the bearer path length is reduced, then backhaul efficiency improves, but the ability to maintain centralized control becomes more difficult
Solution Approach 1:
The bearer path is segmented into TDM and packet portions, allowing the TDM portion to be optimized for short distance (improving backhaul efficiency) while the packet portion maintains the connection to the home MS for centralized control management, thus resolving the contradiction between efficiency and ease of operation.
Solution Approach 2:
The local MS serves as an intermediary that handles the TDM bearer path locally to improve efficiency, while the home MS CCF maintains centralized control through the packet portion, making the system easier to operate by separating the efficiency-optimizing function from the control-management function.
Data Source
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AI summary
Call control for originating and terminating calls in a visited circuit-switched subsystem (CS) or home multimedia subsystem (MS) as well as transferring calls between the visited CS and the home MS may be anchored at a continuity control function (CCF) in the home MS. Call signaling for the call may be passed through the CCF. When the user element is homed to the home MS and served by the visited CS, the bearer path for the call is established based on the relative proximity of the home MS and the visited CS. When a local MS is more proximate to the visited CS, the bearer path may be routed through a gateway in the local MS, instead of through the gateway in the home MS. When the home MS is sufficiently proximate to the visited CS, the bearer path is routed through the gateway in the home MS.