Wireless Control Block Encoding for Extended TFI Addressing
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Solution Overview
Problem
The existing Temporary Flow Identifier (TFI) addressing space in GERAN networks is insufficient, especially with the introduction of Downlink Multi-carrier (DLMC) mode, and existing solutions fail to extend the TFI space effectively for FIRE-coded control blocks, leading to potential misidentification between legacy and new eTFI aware mobile stations.
Innovation Solution
A method involving a wireless device and a radio network node that assigns a TFI and an extended TFI (eTFI) to manage a modified control block by performing bit-wise modulo two addition with a pre-determined bit pattern, using FIRE-decoding to ensure only intended recipients can decode the control information, thereby preventing legacy devices from incorrectly decoding the modified control block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the existing TFI addressing space is used in GERAN networks, then legacy devices can correctly decode control blocks, but the network cannot support sufficient devices especially in DLMC mode
Solution Approach 1:
The patent extends the TFI addressing space by introducing an extended TFI (eTFI) field that adds additional bits to the original TFI structure. This dimensional extension allows the network to support more devices in DLMC mode while maintaining backward compatibility through a fallback mechanism where legacy devices interpret the extended field as part of the control block structure rather than as an extended identifier.
Solution Approach 2:
The patent modifies the control block structure by changing the parameter interpretation: eTFI-aware devices interpret specific bits as an extended identifier field, while legacy devices interpret the same bits as control information. This parameter change allows the same transmitted data to serve different device types appropriately, enabling expanded device support without breaking legacy compatibility.
2Quantity of substance
If eTFI is introduced to extend the TFI space, then more devices can be supported, but legacy devices may incorrectly decode the modified control blocks
Solution Approach 1:
The patent introduces a fallback interpretation mechanism as an intermediary layer between the extended TFI structure and legacy devices. When legacy devices receive control blocks with eTFI, they interpret the extended field according to the original control block structure, effectively mediating between the new extended format and legacy expectations. This prevents incorrect decoding by ensuring legacy devices can still process the transmitted data meaningfully.
3Quantity of substance
If the control block structure is modified to include eTFI, then the TFI addressing space is extended, but the complexity of managing both TFI and eTFI increases
Solution Approach 1:
The patent implements dynamic field interpretation where the meaning of control block fields changes based on device capability. eTFI-aware devices dynamically interpret the extended field as an identifier, while legacy devices dynamically interpret it as control information. This dynamic adaptation simplifies management by allowing the same control block structure to serve different device types without requiring separate management procedures.
Data Source
AI summary
Methods, a wireless device (110) and a radio network node (120) for managing a control block are disclosed. An extended Temporary Flow Identifier, eTFI, is assigned to the wireless device (110) by the radio network node (120). The radio network node (120) constructs the control information. The radio network node (120) performs a bit-wise modulo two addition with a control block and a combination of the eTFI and a pre-determined bit pattern to obtain a modified control block. The radio network node (120) adds channel coding redundancy. The radio network node (120) maps the modified control block onto physical resources. The radio network node (120) sends the modified control block to the wireless device (110). The wireless device (110) decodes the received modified control block removing the channel coding redundancy, performs a bit-wise modulo two addition between the modified control block and a combination of the eTFI and a pre-determined bit pattern to obtain a control block. The wireless device (110) decodes the control block using FIRE-decoding to obtain the control information. The wireless device (110) determines it is the intended recipient of the control information if the TFI information therein matches its assigned TFI. Corresponding computer programs and carriers therefor are also disclosed.