Random Access Data Transmission Method Using Symbol Spreading

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional random access methods in wireless communications suffer from high time delays and significant system resource overhead, along with preamble collisions, which degrade reliability and spectral efficiency, especially in scenarios with multiple concurrent users.

Innovation Solution

A data transmission method that optimizes the random access frame by using symbol spreading with spreading sequences determined by transmission information and system parameters, reducing collisions and improving reliability through explicit or implicit inclusion of terminal and cell identification information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional 4-step random access method is used, then reliability is high, but time delay is large and system resource overhead is large

Engineering Contradiction:

Improverandom access reliabilityVSAvoidrandom access time delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines the random access preamble transmission with uplink data transmission into a single step. The terminal device sends both the random access preamble and uplink data simultaneously on the same time-frequency resource, merging two separate operations (random access and data transmission) into one unified process, thereby reducing the overall time delay while maintaining reliability through the inherent collision resolution mechanisms

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent performs preliminary actions by pre-configuring spreading sequences with embedded terminal identification information and pre-allocating time-frequency resources for combined preamble and data transmission. The base station pre-processes received signals by separating different terminal transmissions before contention resolution, preparing the system in advance to handle multiple concurrent accesses efficiently without requiring sequential processing steps

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conventional random access method is used, then preamble collision events occur, but system resource overhead is large

Engineering Contradiction:

Improvepreamble collision handlingVSAvoidsystem resource overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the parameter structure by embedding terminal identification information directly within the spreading sequences rather than using separate preamble identifiers. This parameter transformation allows the system to distinguish between different terminals using the same time-frequency resource without requiring additional dedicated preamble resources, thereby reducing system resource overhead while maintaining the ability to handle preamble collisions through the identification embedded in the spreading sequences themselves

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple users choose the same preamble, then preamble collision event is caused, but demodulation uncertainty increases

Engineering Contradiction:

Improvemulti-user access capabilityVSAvoiddemodulation accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the received signal processing into distinct stages: first separating signals from different terminal devices using their unique spreading sequences, then performing contention resolution within each separated stream. This segmentation allows the system to handle multiple users on the same resource by dividing the complex multi-user problem into manageable individual processing streams, maintaining demodulation accuracy even when preamble collisions occur

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11223952B2Data transmission method, transmitter, receiver and storage medium

Publication Date: 2022.01.11 XIAN ZHONGXING NEW SOFTWARE

AI summary

A data transmission method is provided. The method includes: a transmitter generates a transmission signal on the basis of transmission information and modulates, by means of a carrier modulation, the transmission signal to a target time-frequency resource for transmission. The transmission information at least includes terminal identification information; or at least includes terminal identification information and signaling information; or at least includes terminal identification information and data information; or at least includes terminal identification information, data information and signaling information; or at least includes terminal identification information and cell identification information; or at least includes terminal identification information, cell identification information and signaling information; or at least includes terminal identification information, cell identification information and data information; or at least includes terminal identification information, cell identification information, data information and signaling information. A transmitter, a receiver and a storage medium are further provided.