Early Stop Decoding Feedback via TFCI Bit Adjustment
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Solution Overview
Problem
In the context of R99 CS voice services, NodeBs struggle to obtain a Transport Format Combination Indicator (TFCI) in time, and terminals fail to feed back downlink decoding results in a timely manner during early stop decoding, leading to poor decoding performance.
Innovation Solution
The method involves adjusting encoded TFCI bits by reducing the number of original bits and using a high code rate encoding method, allowing for earlier TFCI transmission and feedback via the DPCCH, enabling the NodeB to receive TFCI bits quickly and the terminal to feed back decoding results efficiently without adding a new code channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional TFCI encoding with 10 original bits and [32,10] convolutional coding is used, then decoding reliability is maintained, but TFCI acquisition time exceeds 10 ms which prevents early stop decoding
Solution Approach 1:
The patent changes the TFCI encoding parameters by reducing the number of original bits from 10 to fewer bits and using a higher code rate encoding method. This parameter change reduces the encoded TFCI bit length and transmission time, enabling TFCI acquisition within the early stop decoding time window while maintaining sufficient decoding reliability through the optimized encoding scheme.
Solution Approach 2:
The patent applies preliminary action by performing TFCI encoding with reduced bits and higher code rate before transmission, so that the TFCI can be decoded earlier by the NodeB. This preliminary optimization of the encoding parameters ensures that the TFCI is ready for use before the traditional 10 ms threshold, enabling early stop decoding to proceed.
2Loss of energy
If downlink DPCH transmission continues for the full 20 ms TTI, then decoding reliability is ensured, but unnecessary power transmission and interference occur after successful decoding
Solution Approach 1:
The patent implements feedback by having the UE decode the downlink DPCH at intervals within each TTI and feed back the decoding result to the NodeB via the uplink DPCCH. This feedback mechanism allows the NodeB to stop downlink transmission early when decoding succeeds, reducing energy loss and interference, while ensuring reliability by continuing transmission only when needed.
Solution Approach 2:
The patent applies dynamics by making the downlink transmission duration variable rather than fixed at 20 ms. The NodeB dynamically adjusts the transmission stopping point based on the feedback from the UE, stopping early when decoding succeeds and continuing when it fails. This dynamic adaptation optimizes energy efficiency while maintaining decoding reliability.
3Loss of time
If TFCI bits are reduced and high code rate encoding is used, then TFCI acquisition time is reduced enabling early stop decoding, but encoding complexity increases
Solution Approach 1:
The patent changes the encoding parameters by selecting a higher code rate and reducing the number of original TFCI bits. This parameter change reduces the total number of encoded bits to be transmitted and processed, which compensates for the increased complexity per bit through the high code rate, ultimately reducing the overall transmission and processing time.
Data Source
AI summary
A method, apparatus and system for feeding back early stop decoding are provided. The method includes: a terminal side adjusting encoded TFCI bits, and sending the adjusted TFCI bits to a NodeB side via a TFCI domain of an uplink DPCCH (S302); after sending the adjusted TFCI bits to the NodeB side, the terminal side performing a decoding operation on a downlink DPCH, and feeding back, via an idle TFCI domain of the uplink DPCCH, a decoding result to the NodeB side (304). By applying the technical solution, at least one of the problems in the related art that a NodeB cannot obtain a TFCI in time and a terminal side cannot feed back a downlink decoding result in time during early stop decoding can be solved.