PBCH and MIB Decoding with Fewer Blind Decodes for Narrowband IoT
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting narrowband Internet of Things (IoT) devices, which have limited communication resources and require reduced complexity in decoding physical broadcast channel (PBCH) signals, due to their low-powered and simple device nature.
Innovation Solution
The proposed solution involves a method where narrowband IoT devices perform a reduced number of blind decodes and apply cyclic shifts with redundancy checks to obtain the Master Information Block (MIB) from PBCH symbols, rather than traditional multiple blind decodes, optimizing the decoding process for low-complexity devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional multiple blind decodes are performed to obtain MIB from PBCH symbols, then decoding accuracy is maintained, but computational burden and device complexity increase for narrowband IoT devices
Solution Approach 1:
The patent segments the decoding process into two distinct parts: (1) a reduced number of blind decodes to obtain candidate MIB messages, and (2) cyclic shift verification with redundancy checks to validate the correct MIB. This segmentation allows narrowband IoT devices to perform fewer computationally intensive blind decodes while maintaining accuracy through the subsequent verification step.
Solution Approach 2:
The patent applies partial action by performing only a reduced number of blind decodes (less than the traditional multiple blind decodes) to obtain candidate MIB messages. The remaining verification is accomplished through cyclic shift testing and redundancy checks, which are less computationally demanding operations that complete the decoding validation.
2Device complexity
If reduced number of blind decodes are performed to reduce computational burden, then device complexity is reduced, but decoding accuracy may deteriorate
Solution Approach 1:
The patent introduces cyclic shifts and redundancy checks as intermediary verification mechanisms. After performing the reduced number of blind decodes, the device applies cyclic shifts to the received PBCH symbols and performs redundancy checks on the candidate MIB messages. This intermediary step acts as a mediator that validates the correctness of the decoded MIB without requiring multiple full blind decode operations.
Solution Approach 2:
The patent implements a feedback mechanism where the results of cyclic shift verification and redundancy checks are used to confirm or reject candidate MIB messages. The redundancy check provides feedback on whether the decoded MIB is correct, allowing the device to verify decoding accuracy without performing additional blind decodes.
3Use of energy by moving object
If cyclic shifts with redundancy checks are applied instead of multiple blind decodes, then energy consumption is reduced for low-powered devices, but transmission time may increase
Solution Approach 1:
The patent changes the parameters of the decoding process by replacing multiple blind decode operations with cyclic shift operations and redundancy checks. Cyclic shifts are computationally simpler operations that consume less energy, and when combined with efficient redundancy verification, they achieve comparable or better performance with reduced energy consumption and acceptable timing.
Data Source
AI summary
Aspects of the present disclosure provide techniques for physical broadcast channel (PBCH) and master information block (MIB) design. An example method is provided for operations which may be performed by a user equipment (UE). The example method generally comprises receiving, a first number of symbols within a first subframe on a physical channel, performing a first blind decode on the first number of symbols to obtain a first set of bits, performing one or more cyclic shifts on the first set of bits, calculating a redundancy check value for the first set of bits, and decoding an information block based on the whether the redundancy check value passes. Aspects of the present disclosure provide techniques for transmission configurations. An example method is provided for operations which may be performed by a base station (BS). The example method generally comprises selecting a transmission configuration, from a set of predetermined transmission configurations, based on a deployment configuration, generating a signal having an indication of the deployment configuration, and transmitting the signal.