HSDPA Channel Coding with HARQ Bit Selection for Low Latency
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Solution Overview
Problem
Conventional channel coding methods for HSDPA systems require high-speed serial buses, leading to increased latency and system complexity, especially when transmitting data using multiple 16-QAM channelization codes to a single user.
Innovation Solution
The method involves selecting a subset of systematic and parity bits from a transport block for hybrid ARQ processing, allowing only these bits to be channel encoded and transmitted using a given set of channelization codes, eliminating the need for high-speed serial buses and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional channel coding methods are used for HSDPA systems to transmit data using multiple 16-QAM channelization codes, then data transmission capability is improved, but system complexity and latency increase due to requirement of high-speed serial buses
Solution Approach 1:
The patent segments the channel coding process by separating systematic bits and parity bits into different processing paths. Systematic bits are processed through one channel element while parity bits are processed through another, allowing parallel processing without requiring high-speed serial buses between channel elements. This segmentation enables multiple 16-QAM codes to be transmitted simultaneously while reducing inter-channel-element communication requirements.
2Productivity
If conventional channel coding methods are used for HSDPA systems to transmit data using multiple 16-QAM channelization codes, then data transmission capability is improved, but latency increases due to requirement of high-speed serial buses
Solution Approach 1:
The patent divides the transport block into systematic bits and parity bits, assigning them to different channel elements for parallel processing. This eliminates the need for sequential processing through high-speed serial buses, thereby reducing latency while maintaining the capability to transmit multiple 16-QAM codes simultaneously.
Solution Approach 2:
The patent performs preliminary separation of systematic and parity bits before channel coding, preparing the data in advance for parallel processing across multiple channel elements. This pre-processing step eliminates the need for time-consuming data transfer through high-speed serial buses during the transmission phase, thereby reducing overall latency.
3Productivity
If conventional channel coding methods are used for HSDPA systems to transmit data using multiple 16-QAM channelization codes, then data transmission capability is improved, but latency increases
Solution Approach 1:
The patent segments the channel coding functionality across multiple channel elements, with each element processing specific bits (systematic or parity) independently. This parallel processing architecture enables high data transmission rates by utilizing multiple 16-QAM codes simultaneously while avoiding the latency introduced by sequential processing through high-speed serial buses.
Data Source
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AI summary
A method of encoding data for transmission to one or more users selects a given number of bits of data from a transport block to be subject to hybrid ARQ functionality for channel coding. Only the selected bits are channel coded in a HARQ block for subsequent transmission using a given set of channelization codes to one or more users.