Reverse SRVCC Voice Bearer Selection via Default Bearer Intermediary
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Solution Overview
Problem
Current solutions for reverse single radio voice call continuity in cellular networks face challenges in efficiently managing voice bearer selection and temporary media passage during handovers from circuit switched to packet switched communication, particularly in the absence of defined mechanisms for default bearer usage during the reverse SRVCC procedure.
Innovation Solution
An apparatus and method that includes handover processing, resource allocation, and controlling means to temporarily allow real-time protocol and control protocol packets to pass through a default bearer in the packet switched mobile communication gateway, with resource allocation preceding handover processing and command actions, enabling seamless voice bearer control in reverse single radio voice call continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voice media is sent using default bearer immediately after reverse SRVCC, then communication continuity is maintained, but bearer management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the default bearer to carry voice media before the handover is complete. The MME commands the PDN-GW to allow RTP/RTCP packets on the default bearer in advance of the actual voice media transmission, ensuring seamless continuity without waiting for dedicated bearer establishment.
Solution Approach 2:
The patent uses the default bearer as an intermediary during the transition period. Instead of directly switching to a dedicated voice bearer, the system uses the existing default bearer as a temporary carrier for voice media, facilitated by the MME's coordination between the UE and PDN-GW.
2Manufacturing precision
If dedicated bearer is established before handover response, then voice quality is ensured, but handover time increases
Solution Approach 1:
The patent performs preliminary resource allocation by having the MME allocate the QCI-1 bearer resources before the handover response is sent to the UE. This allows the bearer to be ready for immediate use without delaying the handover execution, as the bearer setup is initiated in parallel with the handover signaling.
Solution Approach 2:
The patent implements dynamic bearer management where the system transitions from using the default bearer temporarily to switching to the dedicated QCI-1 bearer once established. This dynamic switching optimizes voice quality while minimizing handover time by having bearers established in different phases of the handover process.
3Productivity
If resource allocation is performed before handover processing, then network efficiency is improved, but coordination complexity increases
Solution Approach 1:
The patent uses feedback mechanisms where the MME coordinates between the UE and PDN-GW based on handover detection and response. The system monitors the handover state and adjusts bearer configuration accordingly, with the MME sending commands to the PDN-GW based on feedback from the handover progress and UE status.
Data Source
AI summary
An apparatus and method capable of creating and controlling voice bearer in reverse single radio voice call continuity comprise performing a handover request action S64 of generating a request to a mobile management entity for a handover of a mobile communication call of a user equipment from circuit switched mobile communication to packet switched mobile communication in response to an indication of required handover S61 by a radio access network controller entity; performing a notification action S62 of notifying an access transfer control function to prepare for the transfer of media to packet switched mobile communication by allocating media ports on an access transfer gateway; and performing an obtaining action S63 of obtaining the allocated media ports from the notified access transfer control function, wherein both the notification action S62 and the obtaining action S63 are performed after the indication of required handover S61 is obtained from the radio access network controller entity and before the performing of the handover request action S64, and information on the allocated media ports is included into the request S64 to the mobile management entity.