Scrambling Sequence Generation for 5G Device Density
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Solution Overview
Problem
Wireless communication systems face a code-limited situation where the number of scrambling codes is insufficient to support a large number of devices, particularly in 5G NR networks, leading to increased interference and hardware complexity for low-power, low-complexity devices.
Innovation Solution
A method is introduced to generate long scrambling sequences by concatenating short scrambling sequences according to assigned extension patterns, allowing for efficient channel symbol scrambling without increasing hardware complexity, thereby supporting a larger number of devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of scrambling codes is increased to support more devices, then the number of supported devices increases, but the system interference level increases and hardware complexity increases
Solution Approach 1:
The patent segments the scrambling code resource by introducing two-dimensional code book indexing (code book index and sequence index) to generate multiple scrambling sequences from a limited set of base sequences. This allows the system to support more devices without increasing the actual number of physical codes, thereby avoiding increased interference and hardware complexity while effectively increasing code availability.
2Quantity of substance
If more scrambling codes are generated using different formulas, then the number of available codes increases, but the hardware complexity increases for low-power devices
Solution Approach 1:
The patent uses a small set of base scrambling sequences from a code book and generates additional sequences through indexing and concatenation operations. Low-power devices can replicate the sequence generation process using simple indexing into the code book rather than implementing complex hardware for generating multiple independent sequences, thereby reducing hardware complexity while maintaining code availability.
3Productivity
If the number of scrambling codes is increased, then more devices can operate simultaneously, but the code limitation problem persists without increasing complexity
Solution Approach 1:
The patent introduces dynamic sequence selection through two-dimensional indexing (code book index and sequence index) that allows the system to adaptively assign scrambling sequences based on device requirements. This dynamic allocation enables more devices to operate simultaneously by efficiently managing the limited code resource pool without requiring each device to have complex hardware, as the complexity is centralized in the indexing and selection mechanism.
Data Source
AI summary
The present disclosure describes the generation of long sequences from short sequences to support concurrent transmissions of large numbers of machine-type communication devices operating in a wireless communication system. These long sequences may be assigned to devices so that the devices can use the long sequences scramble their transmissions. The use of such long sequences permits many machine-type communication devices to transmit during the same time and frequency resource.