Extended TFI Addressing for MTC Device Capacity
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Solution Overview
Problem
The existing Temporary Flow Identity (TFI) addressing space in mobile networks is limited, particularly in GERAN systems, which restricts the number of concurrent Temporary Block Flows (TBFs) that can share radio resources, posing a challenge as the network anticipates a significant increase in Machine Type Communication (MTC) devices and services.
Innovation Solution
The solution expands the TFI addressing space by introducing an extended TFI (eTFI) system, where additional information is combined with traditional TFIs in RLC/MAC blocks to create a larger addressing space, allowing for more TBFs to be supported by reserving code points from the legacy TFI field and using a new eTFI field, and enabling mobile stations and networks to recognize and utilize these extended TFIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the traditional 5-bit TFI field is used for addressing, then the system maintains backward compatibility and simple structure, but the addressing space is limited to 32 values which cannot support the expected 50 billion MTC devices
Solution Approach 1:
The patent extends the addressing space by adding a new dimension to the TFI structure. Instead of merely increasing the bit width of the existing TFI field, it introduces a separate extended TFI (eTFI) field that operates in parallel with the traditional TFI. This dimensional extension allows the system to address vastly more devices (from 32 to potentially billions) while preserving the original 5-bit TFI field for backward compatibility with legacy devices.
Solution Approach 2:
The patent implements a nested addressing structure where the extended TFI (eTFI) field contains or is associated with the traditional TFI field. The eTFI field is structured to include both the extended addressing bits and the original 5-bit TFI values, creating a nested hierarchy where legacy TFIs are embedded within the broader eTFI addressing space. This allows seamless integration of old and new addressing mechanisms.
2Adaptability or versatility
If the TFI addressing space is expanded to support more devices, then more concurrent TBFs can share radio resources, but the complexity of the addressing system increases
Solution Approach 1:
The patent creates a universal addressing system where the extended TFI (eTFI) field serves multiple functions simultaneously. It can address both legacy HTC devices using the traditional 5-bit TFI values and new MTC devices using extended eTFI values. The eTFI field acts as a multi-functional address that can be interpreted differently depending on the device type, allowing a single addressing mechanism to serve diverse communication needs without requiring separate systems.
Solution Approach 2:
The patent segments the addressing functionality into distinct components: the traditional 5-bit TFI field for legacy compatibility and the extended eTFI field for new capabilities. This segmentation allows the system to handle different device types independently while using a unified radio resource framework. The RLC/MAC blocks can be selectively addressed using either TFI or eTFI based on the target device type, reducing overall system complexity by dividing the addressing task into manageable segments.
3Quantity of substance
If additional eTFI field is introduced in RLC/MAC blocks, then the addressing space increases significantly, but the size of control messages increases
Solution Approach 1:
The patent implements a dynamic message structure where the presence and format of the eTFI field in RLC/MAC blocks can vary based on operational context. The system can dynamically switch between using only the traditional TFI field (for legacy devices or simple cases) and incorporating the extended eTFI field (for MTC devices requiring larger addressing space). This dynamic adaptability allows the message structure to optimize its size and complexity based on the specific communication requirements, preventing unnecessary bloat in all messages.
Solution Approach 2:
The patent applies the extended eTFI field locally rather than universally to all RLC/MAC blocks. Instead of adding the eTFI structure to every control message, the system selectively includes eTFI only in messages that require extended addressing capability. This local application of the extended field ensures that the majority of control messages maintain their original compact structure, while only specific messages targeting MTC devices incur the additional overhead, thereby minimizing the overall impact on message size and processing complexity.
Data Source
AI summary
A mobile station for use with a mobile network, and being arranged to be assigned one or more Temporary Block Flows, TBFs, by the mobile network, and to receive RLC/MAC Blocks from the mobile network, each of which RLC/MAC Blocks is associated with one of said TBFs, and to identify a received RLC/MAC Block by means of a Temporary Flow Identity, TFI, which has been assigned by the mobile network to the TBF with which the RLC/MAC Block is associated. The mobile station is arranged to recognize TFIs which belong to a first group of TFIs as well as TFIs which belong to a second group of TFIs, with a TFI in the second group comprising a TFI in the first group of TFIs together with additional information in the received RLC/MAC block.