Node-B Control Proxy for Mobile Network Handovers
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Solution Overview
Problem
Delays in control-loops between slave- and master-processes in mobile telecommunication networks, particularly during intra-RNC handovers, lead to imprecise execution of system functions like power control and ARQ, where Node-Bs have more timely information than RNCs.
Innovation Solution
Temporary delegation of control responsibility from the master-process in the RNC to a master-proxy-process in the Node-B, allowing the Node-B to autonomously execute control functions without context transfer between Node-Bs during handovers, using a master-proxy-process that maintains soft-state and communicates via RelayARQ protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master-process is implemented in the RNC, then centralized control is maintained, but control-loop delays increase and performance deteriorates
Solution Approach 1:
The patent segments the master-process functionality by introducing a master-proxy-process that runs in the Node-B, separating the control function execution from the central RNC. This allows the Node-B to execute control functions locally using cached context information, reducing control-loop delays while maintaining RNC oversight for critical decisions.
Solution Approach 2:
The patent implements preliminary action by having the master-proxy-process pre-cache context information and control parameters from the RNC before handover events occur. This pre-positioning of control data enables the Node-B to immediately execute control functions without waiting for real-time RNC responses, significantly reducing control-loop delays.
2Loss of time
If the master-process is implemented in the Node-B, then control-loop delays are reduced, but intra-RNC handover complexity increases
Solution Approach 1:
The patent introduces the master-proxy-process as an intermediary between the RNC and the Node-B's local control functions. This proxy maintains cached context information and mediates control decisions, simplifying handover management by providing a standardized interface that automatically handles context transfer during intra-RNC handovers without requiring complex coordination protocols.
Solution Approach 2:
The patent uses copying by creating a local copy of the master-process functionality in the form of the master-proxy-process within the Node-B. This copy contains cached context information that is replicated from the RNC, enabling the Node-B to execute control functions independently during handovers without requiring real-time context transfer, thereby reducing handover complexity.
3Measurement precision
If context transfer between Node-Bs is required during handovers, then control accuracy is maintained, but handover time and complexity increase
Solution Approach 1:
The master-proxy-process pre-caches control context information and parameters from the RNC before handover events occur. This preliminary caching ensures that the Node-B has the necessary context data immediately available during handovers, maintaining control accuracy without requiring real-time context transfer between Node-Bs, thereby reducing handover time.
Data Source
AI summary
The present invention relates to a first node and a second node in a mobile telecommunication network. The network comprises a first node, a second node and a third node, wherein the first node is connectable to the second node and the second node is connectable to the first node and to the third node and the third node is connectable to the second node. A system function is realized by the execution of a master-process implemented in the first node and a slave-process implemented in the third node, wherein the execution of the master-process realizes a control function associated with the system function. The master-process of the first node is adapted to temporarily delegate the responsibility to realize the control function to a master-proxy-process implemented in the second node and the master-proxy-process implemented in the second node is adapted to take over the responsibility to realize the control function from the master-process of the first node.