NLOS Backhaul Uplink Framing With RS Interleaving and SC-FDMA
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Solution Overview
Problem
The increasing cell density in radio access networks leads to non-line-of-sight (NLOS) wireless backhaul channels, which existing point-to-point line-of-sight wireless backhaul communication mechanisms are not suitable for, due to increased backhaul link density and differing requirements such as sparser spectrum availability, tighter latency, and lower bit error rates.
Innovation Solution
A method and apparatus for NLOS wireless backhaul communication that includes generating and transmitting uplink data frames using forward error correction encoding, Reed Solomon encoding, byte interleaving, Turbo encoding, and Single Carrier-Frequency Division Multiple Access (SC-FDMA) modulation, along with a transmitter system that performs Discrete Fourier Transform precoding and sub-carrier mapping to maintain low peak-to-average-power ratio and achieve high data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If point-to-point line-of-sight wireless backhaul communication mechanisms are used, then communication reliability is maintained, but the system cannot support increased cell density and non-line-of-sight conditions
Solution Approach 1:
The patent changes key transmission parameters including using single-carrier waveforms with time-domain equalization instead of multi-carrier OFDM, implementing advanced FEC schemes (Turbo coding with rate matching, Reed-Solomon coding), and adjusting modulation schemes (QPSK, 16-QAM, 64-QAM) to adapt to NLOS channel conditions while maintaining communication reliability
Solution Approach 2:
The system dynamically adjusts transmission parameters including selecting different modulation and coding schemes based on channel quality, performing time-domain equalization to adapt to varying multipath conditions, and using hybrid ARQ with incremental redundancy to dynamically improve reliability under changing NLOS conditions
2Productivity
If cell density is increased to meet growing demand for voice and data services, then service capacity is improved, but P2P LOS wireless backhaul communication mechanisms become unsuitable
Solution Approach 1:
The patent creates a universal wireless backhaul system that can operate in both LOS and NLOS conditions, supporting high cell density deployments. The system uses configurable transmission parameters, multiple modulation schemes, and advanced equalization techniques to provide multi-functional capability across different deployment scenarios and density requirements
3Reliability
If advanced error correction techniques are applied, then bit error rate is reduced, but transmission complexity increases
Solution Approach 1:
The patent segments the error correction process into multiple stages: outer Reed-Solomon coding, inner Turbo coding with rate matching, and hybrid ARQ with incremental redundancy. This segmentation allows each component to be optimized independently and provides progressive error correction, reducing overall BER while managing complexity through modular design
Solution Approach 2:
The patent introduces intermediate processing components including rate matching units, circular buffers, and interleavers that mediate between the source data and final transmission. These intermediaries optimize the error correction process by systematically managing code rate adaptation and error distribution, achieving low BER with controlled complexity
Data Source
AI summary
A method for uplink (UL) wireless backhaul communication at a wireless backhaul remote unit in a radio access network comprising receiving a configuration for radio frames and a transmission schedule through a downlink (DL) physical layer broadcast channel, wherein the transmission schedule comprises a transmission allocation for the remote unit, generating a UL data frame, wherein generating the UL data frame comprises performing forward error correction (FEC) encoding on a data bit stream to generate a plurality of FEC codewords, wherein performing the FEC encoding comprises performing Reed Solomon (RS) encoding on the data bit stream to generate a plurality of RS codewords, performing byte interleaving on the RS codewords, and performing Turbo encoding on the byte interleaved RS codewords to generate one or more Turbo codewords, wherein each Turbo codeword is encoded from more than one RS codeword, and transmitting the UL data frame according to the transmission allocation.