Uplink Status Flag Extraction in Cellular Wireless Terminals
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Solution Overview
Problem
In cellular wireless communication systems, wireless terminals face challenges in quickly and efficiently determining when to transmit on the uplink due to the joint channel coding of Uplink Status Flag (USF) bits with data, which requires immediate processing to maintain proper timing, especially when using the CS-1 channel coding scheme.
Innovation Solution
The system processes four RF bursts to extract Uplink Status Flag (USF) bits from a data block, allowing for immediate determination of transmission timing while processing data bits in the background, employing a shortened decoding process for CS-1 coding and utilizing an RF front-end, baseband processor, and CODEC processing module to handle GSM standard compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint channel coding of USF bits with data is used (CS-1 scheme), then coding efficiency is improved, but processing time increases and timing requirements become more difficult to meet
Solution Approach 1:
The patent segments the data block processing by identifying and extracting the USF bits separately from the data bits. The base station divides the transmitted block into USF portion and data portion, allowing the wireless terminal to process only the critical USF bits immediately while deferring data bit processing, thus resolving the timing conflict while maintaining joint coding efficiency
Solution Approach 2:
The patent extracts the USF bits from the jointly coded block by utilizing the known structure of CS-1 coding. The wireless terminal applies the same channel coding parameters to extract only the USF portion without fully decoding the entire block, taking out the critical timing information while leaving data processing for later, thereby reducing processing time while maintaining coding efficiency
2Measurement precision
If complete decoding of data block is performed, then data accuracy is improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent applies partial action by performing only the necessary decoding steps to extract USF bits without completing the full data block decoding process. The wireless terminal processes the USF portion with sufficient accuracy for timing determination while avoiding the excessive processing required for complete data decoding, thus reducing complexity and power consumption while maintaining adequate accuracy for the timing function
Data Source
AI summary
Determining whether a first wireless terminal may transmit on an uplink to a servicing base station in a cellular wireless communication system includes first receiving a plurality of a Radio Frequency (RF) bursts at a wireless terminal from a servicing base station. These RF bursts carry a data block containing both Uplink Status Flag (USF) bits and Data bits. Data bits may or may not be intended for the receiving wireless terminal. The RF bursts are processed to produce the data block in an encoded format. This data block is then partially decoded to extract the USF bits when the data bits are not intended for the receiving wireless terminal. These USF bits determine when the receiving wireless terminal can transmit or uplink to the servicing base station. The partial decoding may be halted once the USF bits have been extracted from the received data block to reduce power consumption and processing requirements.