Temporary Flow Identity Encoding for PAN Feedback Distinction
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Solution Overview
Problem
In wireless communication systems, terminals multiplexed in the same channel cannot correctly distinguish between different types of piggybacked acknowledgement/non-acknowledgement (PAN) feedback, leading to incorrect feedback information being obtained, as they randomly determine the type of PAN, which may result in unsuccessful verification checks and incorrect feedback.
Innovation Solution
A method and apparatus for distinguishing feedback information by using a non-zero temporary flow identity (TFI) to perform an Exclusive-OR operation with the cyclic redundancy check (CRC) from the received feedback, generating a new CRC using a generator polynomial, and verifying if it matches the original CRC to ensure the feedback information corresponds to the terminal, thereby correctly identifying the type of PAN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals randomly determine the type of PAN feedback when multiplexed in the same channel, then the feedback processing can proceed, but the terminals may obtain incorrect feedback information leading to verification failures and unreliable communication
Solution Approach 1:
The patent uses different TFI value ranges as distinct identifiers (analogous to color coding) to differentiate between SSN-based PAN and time-based PAN feedback types. Specifically, TFI values of 0-7 indicate SSN-based PAN while TFI values of 8-15 indicate time-based PAN, allowing terminals to immediately identify the feedback type without random determination, thereby ensuring both processing efficiency and information accuracy
Solution Approach 2:
The patent changes the TFI parameter assignment rule to encode feedback type information. By allocating specific TFI value ranges to different PAN types and ensuring the network side assigns TFI values according to this rule, the terminal can determine the PAN type directly from the TFI value, eliminating the need for random determination and ensuring reliable feedback processing
2Device complexity
If the network side does not provide indication on PAN type, then the feedback transmission is simple, but terminals cannot correctly identify the PAN type leading to verification check failures
Solution Approach 1:
The patent merges the PAN type identification function into the existing TFI field. Instead of adding a separate indication bit or field for PAN type, the solution encodes the PAN type information within the TFI value range itself. This merging approach maintains feedback transmission simplicity while enabling reliable PAN type identification through the TFI value
Solution Approach 2:
The patent modifies the TFI parameter assignment strategy to embed PAN type information. The network side is instructed to assign TFI values from specific ranges based on the PAN type (0-7 for SSN-based, 8-15 for time-based), transforming the TFI parameter into a dual-purpose field that both identifies the temporary block flow and indicates the feedback type without increasing transmission complexity
Data Source
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AI summary
A method and a device for assigning temporary flow identities (TFIs) are provided. The method includes: assigning a non-zero TFI to a terminal's each temporary block flow (TBF) fed back by a piggybacked acknowledgement/non-acknowledgement (PAN), where the terminal uses a starting sequence number-based (SSN-based) PAN and multiplexed in a channel with one or more other terminals, and providing the non-zero TFI to the terminal. A method and a device for distinguishing feedback information by using TFIs assigned by the assigning method are further provided.