Scrambling Initialization for eMTC Control Message Multiplexing
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Solution Overview
Problem
Current wireless communication technologies face challenges in supporting a large number of low complexity and low throughput devices, such as Cellular Internet of Things (CIoT) and Machine-Type Communications (MTC) devices, particularly in 3GPP Release 13 and earlier LTE systems.
Innovation Solution
The application of scrambling to coded bits carried by a physical downlink shared channel (PDSCH) or narrowband PDSCH (NPDSCH) for enhanced MTC (eMTC) and NB-IoT systems, respectively, using a scrambling initialization based on a pseudorandom sequence and specific initialization values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional transmission methods are used for system information and paging messages, then the existing LTE system structure is maintained, but the capacity to support a large number of low complexity and low throughput devices is limited
Solution Approach 1:
The patent applies parameter changes by modifying the scrambling initialization values and sequences used in control message transmission. Specifically, it introduces device-specific parameters (such as device IDs, group IDs, or service types) into the scrambling initialization process, which transforms the transmission characteristics to enable efficient multiplexing of multiple devices while maintaining compatibility with existing LTE infrastructure. This allows the system to support a larger quantity of low complexity devices without sacrificing transmission efficiency.
2Quantity of substance
If scrambling is applied to control messages, then the capacity to support more devices is improved, but the complexity of the transmission protocol increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring scrambling initialization values and sequences before control message transmission. The network side determines appropriate scrambling parameters based on device characteristics, service types, or resource allocations in advance, and this configuration is incorporated into the transmission protocol. This preliminary setup enables efficient device multiplexing while keeping the actual transmission process relatively simple, as the complex parameter selection has already been performed beforehand.
3Productivity
If conventional paging and system information transmission is used, then existing device compatibility is maintained, but transmission efficiency for low complexity devices is insufficient
Solution Approach 1:
The patent applies universality by designing a scrambling mechanism that serves multiple functions simultaneously. The same scrambling framework can accommodate different device types (low complexity devices, conventional devices), different service categories (IoT, MTC, traditional mobile), and different message types (system information, paging messages). By using flexible initialization values that can be adapted to various scenarios while maintaining a unified transmission structure, the patent achieves improved transmission efficiency without compromising device compatibility.
Data Source
AI summary
Technology for an eNodeB operable to apply scrambling to coded bits transported via a physical downlink shared channel (PDSCH) to a user equipment (UE) is disclosed. The eNodeB can generate a code word that comprises coded bits for transmission to the UE. The UE can be a bandwidth-reduced low complexity (BL) UE or a coverage enhancement (CE) UE. The eNodeB can identify, for the BL UE or the CE UE, a scrambling sequence to be applied to the coded bits. The scrambling sequence can be initialized using a defined initialization value (cinit). The eNodeB can apply the scrambling sequence with the defined initialization value to the coded bits to obtain scrambled coded bits. The eNodeB can encode the scrambled coded bits for transmission to the UE via the PDSCH.