Uplink DPCCH TFCI Feedback for Early Stop Decoding
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Solution Overview
Problem
In mobile communication, particularly in R99 CS voice services, the NodeB side struggles to obtain a Transport Format Combination Indicator (TFCI) in time, and the terminal side cannot feed back a downlink decoding result in time during early stop decoding, leading to poor decoding performance.
Innovation Solution
The terminal side adjusts encoded TFCI bits by reducing the number of bits or using a high code rate encoding method, and increases the proportion of the TFCI domain in the uplink DPCCH, allowing for earlier TFCI transmission and decoding result feedback via an idle TFCI domain, enabling the NodeB to decode the uplink DPDCH only after receiving the TFCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal side uses traditional TFCI encoding with 10 original bits and [32,10] convolutional coding, then the TFCI transmission reliability is maintained, but the NodeB side cannot obtain TFCI in time for early stop decoding
Solution Approach 1:
The patent changes the TFCI encoding parameters by reducing the number of original bits from 10 to 7 and adjusting the convolutional coding rate, which shortens the encoded bit sequence length and enables faster TFCI transmission and acquisition for early stop decoding
Solution Approach 2:
The patent performs preliminary action by transmitting the reduced TFCI bits earlier in the transmission timeline, allowing the NodeB to acquire TFCI before the decoding deadline and enable early stop decoding functionality
2Loss of time
If the terminal side transmits complete TFCI information, then the decoding accuracy is maintained, but the transmission time exceeds the early stop decoding requirement
Solution Approach 1:
The patent extracts only the essential TFCI information by reducing the number of original bits from 10 to 7, removing redundant bits while retaining the core decoding requirements, thus enabling timely transmission without sacrificing decoding accuracy
Solution Approach 2:
The patent applies partial action by transmitting a reduced but sufficient portion of TFCI information that meets the early stop decoding requirements without transmitting the complete traditional TFCI sequence
3Adaptability or versatility
If the terminal side uses traditional DPCCH channel structure, then the control information transmission is standardized, but there is no idle TFCI domain for feedback transmission
Solution Approach 1:
The patent makes the TFCI domain multi-functional by using it for both its original purpose and as an idle domain for feedback transmission, eliminating the need for separate feedback channels and reducing overall system complexity
Solution Approach 2:
The patent merges the feedback transmission function with the existing TFCI domain structure, combining multiple functions into a single channel domain without requiring additional separate channels
Data Source
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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. Without adding a new code channel, a TFCI domain of a DPCCH is fully used, and the transmitting power of a terminal is saved, and meanwhile, the number of times for the terminal and the NodeB to try early stop decoding is decreased, thus decoding resources are saved.