MTC Device Transmission Method for Overlapping Subframe Resource Management
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Solution Overview
Problem
Machine type communication (MTC) apparatuses in coverage extension regions face difficulties in receiving physical downlink shared channels (PDSCH) and physical downlink control channels (PDCCH) due to overlapping subframes and low performance capabilities, leading to increased complexity and decoding failures.
Innovation Solution
The base station repeatedly transmits PDCCH or PDSCH on multiple subframes, with strategies to manage overlapping physical resource blocks (PRBs) by transmitting only one bundle of data in overlapping subframes, puncturing or delaying other data transmissions, and adjusting scheduling information to prevent collisions and ensure reliable reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS repeatedly transmits PDCCH or PDSCH on multiple subframes for MTC apparatus in coverage extension region, then the reception reliability is improved, but the complexity of MTC apparatus increases and decoding failure probability increases due to overlapping channels
Solution Approach 1:
The patent segments the bundle transmission by dividing it into first bundle (cell-specific data) and second bundle (UE-specific data), and further segments the time resources by identifying overlapping subframes between bundles. This segmentation allows the MTC apparatus to process channels in manageable portions without simultaneous decoding of multiple overlapping channels, reducing complexity while maintaining reliability.
Solution Approach 2:
The patent applies partial action by having the MTC apparatus receive only the first bundle in overlapping subframes and drop the second bundle, rather than attempting to receive both complete bundles simultaneously. This partial reception approach reduces the immediate decoding complexity while still providing reliable communication through the first bundle transmission.
2Device complexity
If the BS transmits PDCCH or PDSCH to MTC apparatus in coverage extension region as if to normal UE, then the network simplicity is maintained, but the reception performance deteriorates
Solution Approach 1:
The patent applies local quality by treating MTC apparatus differently from normal UEs specifically in coverage extension regions. The BS transmits first bundle (cell-specific data) and second bundle (UE-specific data) with different handling strategies: the first bundle is transmitted in all subframes while the second bundle is transmitted only in non-overlapping subframes. This differentiated local treatment improves reception performance for MTC apparatus without requiring complete network redesign.
3Reliability
If bundle transmission is used for MTC apparatus, then the reception reliability is improved, but the probability of channel overlap increases causing decoding failure
Solution Approach 1:
The patent applies preliminary action by having the MTC apparatus receive the first bundle (cell-specific data) before the second bundle (UE-specific data) in overlapping subframes. The apparatus is configured to receive and decode the first bundle first, then drop the second bundle in overlapping subframes. This preliminary reception of critical cell-specific information ensures reliability while avoiding simultaneous decoding conflicts that would cause failure.
Data Source
AI summary
A disclosure of the present specification provides a transmission and reception method of a machine type communication (MTC) device. The transmission and reception method of the MTC device may comprise the steps of: receiving first scheduling information indicating that a bundle of first data can be transmitted or received in multiple first sub-frames; and receiving second scheduling information indicating that a bundle of second data can be transmitted or received in multiple second sub-frames. Herein, when a physical resource block (PRB) of some sub-frames of the multiple first sub-frames overlaps a PRB of some sub-frames of the multiple second sub-frames, only one of the bundle of the first data and the bundle of the second data can be transmitted and received in the overlapping sub-frame.