RFCI Handling in HNB Relocation for Transcoder-Free Voice
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Solution Overview
Problem
In mobile communication systems with Home Node-B (HNB) and Home Node-Gateway (HNB-GW) configurations, the mismatch of Radio Access Bearer sub-flow Combination Indicator (RFCI) information between movement-origin and movement-destination base stations hinders transcoder-free operation during intra-HNB-GW relocation, leading to disrupted voice communication.
Innovation Solution
The system sets RFCI information in advance for both movement-origin and movement-destination base stations and uses a higher-order apparatus or gateway apparatus to transmit and convert this information without an Iu User Plane Initialization procedure, ensuring consistent data frame structures and maintaining transcoder-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RFCI information is not handed over between movement-origin and movement-destination base stations during relocation, then the Iu User Plane Initialization procedure is avoided, but RFCI information mismatch occurs and transcoder-free operation cannot be maintained
Solution Approach 1:
The patent applies preliminary action by having the movement-origin base station transmit its RFCI information to the higher-order apparatus before relocation occurs. The higher-order apparatus then proactively transmits this pre-acquired RFCI information to the movement-destination base station, ensuring that RFCI information is available before the relocation completes, thus maintaining transcoder-free operation without waiting for post-relocation initialization.
Solution Approach 2:
The patent introduces a higher-order apparatus as an intermediary between the movement-origin base station and movement-destination base station. This intermediary receives RFCI information from the movement-origin base station and forwards it to the movement-destination base station, enabling RFCI information handover without requiring direct communication between the base stations or triggering Iu User Plane Initialization.
2Reliability
If RFCI information is handed over between base stations during relocation, then transcoder-free operation is maintained, but additional signaling procedures are required
Solution Approach 1:
The patent applies universality by utilizing the existing RANAP Relocation Required and Relocation Request messages for dual purposes: both the relocation procedure itself and the RFCI information handover. The higher-order apparatus incorporates RFCI information transmission within these existing message structures, allowing one mechanism to serve multiple functions without adding separate dedicated signaling procedures.
Solution Approach 2:
The patent applies copying by having the higher-order apparatus copy the RFCI information from the movement-origin base station and replicate it in the relocation signaling messages sent to the movement-destination base station. This copying mechanism ensures accurate transmission of RFCI information without requiring the movement-destination base station to regenerate or re-derive the information.
3Productivity
If RFCI information mismatch occurs between base stations, then voice communication can proceed with transcoder-free operation, but data frame structure consistency is compromised
Solution Approach 1:
The patent applies feedback by having the movement-destination base station receive and process RFCI information from the movement-origin base station through the higher-order apparatus. This feedback mechanism ensures that the movement-destination base station is informed about the expected data frame structure, allowing it to properly interpret and process incoming voice data without requiring transcoder intervention.
Data Source
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AI summary
A mobile communication system including: a terminal, a movement-origin base station to which the terminal connects before movement of the terminal; a movement-destination base station to which the terminal connects after movement of the terminal; and a higher-order apparatus that has the movement-origin base station and the movement-destination base station under its control. Control information for voice encoding is set in advance in the movement-origin base station and the movement-destination base station, the movement-origin base station includes the control information of its own station in a first message and transmits the first message to the higher-order apparatus, and the higher-order apparatus includes the control information of the movement-origin base station in a second message and transmits the second message to the movement-destination base station.