MTC Region Segmentation for LTE Control Channel Collision Avoidance
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Solution Overview
Problem
Current mobile broadband networks, such as LTE and LTE-Advanced, are not designed to efficiently support Machine-Type Communication (MTC) devices due to bandwidth limitations and collisions on control channels, which affect the integration of MTC devices into these networks.
Innovation Solution
The implementation of a Machine-Type Communication (MTC) region within the network architecture, which includes designing MTC-specific channels like M-PBCH, M-SIB, M-PDCCH, and M-CRS, to allocate time and frequency resources effectively, reducing collisions and optimizing MTC device support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MTC devices use existing LTE control channels, then network integration is enabled, but collisions on control channels occur and performance deteriorates
Solution Approach 1:
The patent segments the control channel resources by creating MTC-specific control channels (M-PDCCH) separate from legacy LTE control channels (PDCCH). This segmentation allows MTC devices to use dedicated control resources, avoiding collisions with legacy devices while maintaining network integration. The control channel resources are divided into distinct domains for different device types.
Solution Approach 2:
The patent introduces MTC-specific physical channels (M-PBCH, M-PDCCH, M-PDSCH) as intermediary elements between MTC devices and the LTE network. These intermediary channels act as a bridge, allowing MTC devices to communicate effectively without directly competing with legacy devices for standard LTE resources, thus resolving the collision problem while enabling network integration.
2Reliability
If MTC-specific channels are designed and implemented, then collisions are reduced and MTC performance improves, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent implements MTC-specific channels that can operate within the existing LTE framework, making the system multi-functional. The same physical layer structures and processing mechanisms used in LTE are reused for MTC channels, allowing the system to handle both legacy and MTC devices with a unified architecture. This reduces implementation complexity despite the added functionality.
Solution Approach 2:
The patent modifies existing LTE channel parameters and resource allocation schemes to accommodate MTC devices. By changing parameters such as bandwidth allocation, resource block assignment, and control channel structure, the system achieves MTC optimization without fundamentally redesigning the entire channel architecture, thereby limiting the increase in device complexity.
3Productivity
If MTC region is allocated within licensed bandwidth, then resource allocation is optimized, but bandwidth availability for other devices is reduced
Solution Approach 1:
The patent allocates MTC resources in the time domain by introducing specific subframe structures and periodicities for MTC channels. Instead of solely competing for frequency bandwidth, MTC devices are assigned specific time slots and subframe patterns, effectively moving the resource allocation problem into the time dimension. This allows efficient MTC resource allocation without permanently reducing bandwidth availability for other devices.
Solution Approach 2:
The patent implements periodic transmission patterns for MTC channels, where MTC-specific resources are activated in periodic intervals rather than continuously. This periodic action allows the licensed bandwidth to be shared between MTC and legacy devices, with each having dedicated resources during their respective time periods, thus optimizing overall resource allocation efficiency without permanently sacrificing bandwidth for any single device type.
Data Source
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AI summary
A bandwidth-limited user equipment (UE) configured for machine-type communication (MTC). The apparatus comprising: means to decode, from signaling received from a Base Station (BS), a MTC physical downlink control channel (MPDCCH) intended for the bandwidth-limited UE, the MPDCCH including downlink control information (DCI) indicating a physical downlink shared channel (PDSCH) subframe assignment for the bandwidth-limited UE; means to decode the PDSCH, in a first subframe according to the DCI in the MPDCCH, wherein the PDSCH is received a predetermined number of subframes after a last subframe in which the MPDCCH is received, and wherein a starting symbol for an initial subframe in which the MPDCCH is transmitted is configured by the BS.