Narrowband MIB Decoding via Resource Segmentation and Repetition
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Solution Overview
Problem
Narrowband Internet of Things (NB-IoT) devices face challenges in acquiring the Narrowband Master Information Block (MIB-NB) in low-signal environments due to insufficient coding rate or repetition for decoding in a single attempt, leading to prolonged energy consumption and reduced battery life, especially in IoT devices that require quick data transmission.
Innovation Solution
A method where a network node provides a UE with pre-acquisition awareness of repetition methods by utilizing unused resources in the physical resource block, allowing the UE to combine repetitions and decode the MIB-NB more quickly, thereby improving operational duration and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coding rate and repetition for MIB-NB decoding are increased to enable single-attempt decoding in low-signal environments, then the decoding reliability is improved, but the available resources in the physical resource block are consumed, reducing the bandwidth for other data transmission
Solution Approach 1:
The MIB-NB information block is segmented into multiple parts and transmitted across different resource elements within the physical resource block. This segmentation allows the system to distribute the critical information across available resources without requiring a single large contiguous resource allocation, thereby maintaining decoding reliability while preserving bandwidth efficiency.
Solution Approach 2:
The patent utilizes the time dimension by employing repetition across multiple subframes and the frequency dimension by distributing information across different resource elements within the physical resource block. This multi-dimensional approach allows the system to achieve reliable decoding through diversity without consuming excessive single-dimension resources.
2Reliability
If multiple repetition attempts are used for MIB-NB decoding in low-signal environments, then the decoding reliability is improved, but the time required for acquisition increases, leading to prolonged energy consumption
Solution Approach 1:
The system performs preliminary actions by pre-configuring the physical resource block with specific resource elements designated for MIB-NB transmission and pre-establishing the repetition pattern across subframes. This preliminary setup enables the UE to efficiently locate and decode MIB-NB without requiring multiple blind search attempts, thereby reducing acquisition time while maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE can detect the presence of MIB-NB in early subframes and provide feedback to stop further decoding attempts if successful, or continue with a predetermined repetition pattern if unsuccessful. This feedback-driven approach optimizes the balance between reliability and acquisition time by avoiding unnecessary prolonged attempts.
3Reliability
If the UE performs multiple decoding attempts for MIB-NB in low-SNR regions, then the probability of successful acquisition is improved, but the device energy consumption increases, reducing battery life
Solution Approach 1:
The patent extracts and isolates the critical MIB-NB information transmission to specific designated resource elements within the physical resource block, separating it from other data transmissions. This extraction allows the UE to focus its decoding efforts on these specific resources, improving the probability of successful acquisition while reducing overall energy consumption by avoiding unnecessary processing of non-critical resources.
Solution Approach 2:
The system changes parameters such as the coding rate, repetition factor, and resource element allocation for MIB-NB transmission based on the signal environment. In low-SNR regions, the network can adjust these parameters to provide more robust transmission, enabling the UE to achieve reliable decoding with fewer attempts and thus reducing energy consumption while maintaining acquisition success probability.
4Device complexity
If the NPBCH physical structure is made common for all deployment modes to ensure transparency to UEs, then the device complexity is reduced, but the optimization for specific deployment scenarios is limited
Solution Approach 1:
The patent designs the NPBCH physical structure to be universal and common across all deployment modes (standalone, in-band, guard-band), allowing a single UE implementation to handle all scenarios without mode-specific complexity. The same physical layer procedures and resource allocations work across different deployment modes, achieving universality while the higher-layer RRC signaling provides mode-specific information when needed.
Data Source
AI summary
Exemplary embodiments include methods and/or procedures for operating a wireless device (420, 1210) in communication with a first network node. Exemplary embodiments include receiving (902), from the first network node, an indication of at least one repetition method used in a broadcast channel transmitted by a second network node (401, 1260), wherein the repetition method comprises: a first portion of an information block in first resources of the broadcast channel that are reserved for the information block; and a second portion of the information block, comprising at least a subset of the first portion, in second resources of the broadcast channel that are different from the first resources. Exemplary embodiments also include receiving (904) the broadcast channel transmitted by the second network node, and decoding (906) the information block by combining the first portion and the second portion. Exemplary embodiments also include complementary methods and/or procedures performed by first and second network nodes, as well as wireless devices, network nodes, and computer-readable media configured in accordance with the exemplary methods and/or procedures.