GSM Network Node Call Identifier Design
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Solution Overview
Problem
The complexity of GSM systems is increased by translation technologies between TDM and IP-based Abis interfaces, and there is a need for a simplified method to extend the addressing space of calls in GSM networks.
Innovation Solution
A network node that receives TDMA frames, extracts payload from calls, assigns identifiers to the payload, and generates data packets with these identifiers, allowing for efficient transmission and association of payload with specific calls within the GSM network, using RTP packets and incorporating information like subrate indicators and Vamos subchannels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If translation technologies between TDM and IP-based Abis interfaces are used, then the GSM system can support IP-based transmission, but the complexity of the GSM system increases
Solution Approach 1:
The patent extracts the translation function into a separate network node that handles TDM to IP conversion independently. This node receives TDMA frames, extracts payload from individual calls, assigns identifiers, and generates separate IP packets for each call, thereby isolating the complexity of translation from the core GSM system while maintaining IP-based transmission capability
Solution Approach 2:
The patent segments the aggregated IP packet into individual call packets. Instead of transmitting one large bundled packet containing multiple calls, the system divides it into separate packets, each containing payload from a single call with its own identifier. This segmentation simplifies routing and handling at subsequent network nodes
2Productivity
If multiple calls are bundled into a single data packet for transport, then transmission efficiency is improved, but the addressing space of calls is limited
Solution Approach 1:
The patent implements a nested identifier structure where a call identifier is embedded within the IP packet header. The identifier contains multiple fields including TDMA frame information, timeslot number, subrate indicator, and Vamos subchannel. This nested approach allows individual call identification within the aggregated packet structure, extending the addressing space while maintaining transmission efficiency
Solution Approach 2:
The patent extends the addressing space by adding multiple dimensional identifiers to the packet structure. Instead of relying solely on traditional IP addressing, the system incorporates TDMA frame number, timeslot index, subrate level, and Vamos subchannel as additional addressing dimensions, enabling precise call identification in a multi-dimensional address space
Data Source
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AI summary
A network node (800) for a GSM network (100), arranged to receive (805, 810) a TDMA frame comprising a plurality of timeslots, each of which comprises payload from one or more calls. The network node (800) extracts (815, 820) payload from calls and to assigns (815, 820) the extracted payload a corresponding identifier identifying the call of the payload. The network node (800) is also arranged to generate (820) a data packet comprising the extracted payload from calls together with their corresponding identifier, and places (820) the corresponding identifier in a header in the data packet. The network node (800) is also arranged to transmit (805, 825) the data packet to another node in the GSM network (100).