BSS Redundancy Negotiation for GSM A Interface Packet Loss
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Solution Overview
Problem
The transition to IP transmission on the A interface in GSM networks leads to packet loss, delay, and jitter, affecting voice quality and reliability of CSD services, particularly fax services, which are sensitive to data loss.
Innovation Solution
A method for negotiating a redundancy level between the Base Station Subsystem (BSS) and the Mobile Switching Center (MSC) through redundancy level negotiation messages, allowing the BSS to choose and generate redundancy packets based on supported capabilities, thereby reducing user data loss and improving Quality of Service (QoS) for voice and CSD services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IP transmission technology is adopted on the A interface, then transmission efficiency and bandwidth utilization are improved, but packet loss occurs leading to deteriorated voice quality and increased CSD service failure probability
Solution Approach 1:
The patent applies preliminary action by negotiating and establishing redundancy level configurations before actual data transmission begins. The BSS and MSC exchange capability information and agree on redundancy parameters in advance, so that when packet loss occurs during IP transmission, the pre-configured redundancy packets are already available for immediate recovery, preventing voice quality deterioration and CSD service failures
Solution Approach 2:
The patent implements beforehand cushioning by generating and transmitting redundancy packets that serve as a protective buffer against packet loss. These redundancy packets are created in advance based on negotiated redundancy levels and sent alongside or instead of original data packets, providing a safety cushion that allows recovery from packet loss without affecting service quality or reliability
2Reliability
If data redundancy technology is implemented to reduce packet loss impact, then reliability is improved, but network bandwidth consumption and transmission complexity increase
Solution Approach 1:
The patent applies dynamics by making the redundancy level configurable and adaptable rather than fixed. The system negotiates redundancy levels dynamically between BSS and MSC based on current network conditions, service requirements, and device capabilities. This allows the redundancy mechanism to be active only when needed, optimizing the balance between reliability improvement and bandwidth consumption by adjusting redundancy packet generation based on real-time conditions
Solution Approach 2:
The patent implements parameter changes by introducing configurable redundancy level parameters that control the amount of redundancy data generated. Different redundancy levels can be selected to match different service requirements - higher levels for critical services like fax over CSD, lower levels for less sensitive services. This parameter-based approach allows fine-tuning of the trade-off between reliability and bandwidth consumption based on specific operational needs
Data Source
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AI summary
The present invention discloses a method, system, Base Station Subsystem (BSS), and Mobile Switching Center (MSC) for data transmission, and pertains to the communication field. The method includes: The BSS negotiates a redundancy level with the MSC through a redundancy level negotiation message, and chooses a redundancy level; and the BSS generate a redundancy packet according to the chosen redundancy level and sends the redundancy packet to the MSC. The system includes a BSS and an MSC. The BSS includes: a sending module, a first receiving module, a decision-making module, and a redundancy data generating module. The MSC includes a second receiving module and a responding module. In the technical solution under the present invention, the probability of user data loss as a result of packet loss is substantially reduced in AoIP, and the QoS of the voice service and the CSD service is improved.