Relay Control Channel Resource Mapping for LTE Networks
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Solution Overview
Problem
In 3GPP LTE systems, the Relay Physical Downlink Control Channel (R-PDCCH) is not located within the control area of a subframe, leading to challenges in multiplexing it with data channels in the data area, which affects network resource utilization and communication efficiency.
Innovation Solution
A method and system for transmitting control information by combining control data for relay nodes into a control channel data stream, mapping transmission resources into non-contiguous physical resource blocks using a distributed virtual resource mapping rule, and transmitting these blocks to relay nodes, thereby improving frequency diversity and network resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If R-PDCCH is located within the data area of a subframe and multiplexed with data channels, then network resource utilization is improved, but multiplexing challenges arise affecting communication efficiency
Solution Approach 1:
The patent segments the control data for different relay nodes into separate control channel elements (CCEs), which are then independently mapped to physical resource blocks. This segmentation allows flexible multiplexing with data channels while maintaining organized resource allocation for each relay node.
Solution Approach 2:
The patent introduces a new dimension of resource organization by mapping control channel elements to physical resource blocks in a distributed manner across frequency resources. This dimensional transformation enables control and data channels to coexist in the same time-frequency grid without traditional multiplexing conflicts.
2Productivity
If control data for multiple relay nodes is combined into a single control channel data stream, then transmission efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent combines control data for multiple relay nodes into a single control channel data stream that is transmitted together. This merging improves transmission efficiency by utilizing the same physical resources for multiple control messages, while the underlying resource mapping structure maintains individual allocability.
Solution Approach 2:
The control channel resource structure is designed to serve multiple relay nodes simultaneously through a universal mapping framework. The same set of physical resource blocks can be allocated to different relay nodes at different times or frequencies, providing multi-functional resource usage that improves efficiency without proportionally increasing complexity.
3Reliability
If contiguous transmission resources are mapped to non-contiguous physical resource blocks using distributed virtual resource mapping, then frequency diversity is improved, but mapping complexity increases
Solution Approach 1:
The patent transforms the resource mapping from a direct contiguous-to-contiguous mapping to a distributed mapping that spans multiple frequency dimensions. Virtual resource block indices are mapped to physical resource block indices using a distribution function that spreads adjacent virtual blocks across non-adjacent physical blocks, achieving frequency diversity through dimensional transformation.
Solution Approach 2:
The patent changes the mapping parameter from identity mapping (contiguous to contiguous) to a distributed mapping function that transforms virtual resource block indices into non-contiguous physical resource block indices. This parameter transformation maintains the logical structure of resource allocation while achieving physical frequency diversity for improved reliability.
Data Source
AI summary
A system and method for transmitting control information are provided. A method for communications controller operations includes combining control data for each relay node of at least one relay node into a control channel data stream, mapping a plurality of transmission resources for the control channel data stream into a plurality of physical resource blocks using a distributed virtual resource mapping rule, and transmitting the plurality of physical resource blocks to the set of at least one relay node. The plurality of transmission resources are mapped to physical resource blocks that are non-contiguous in a frequency domain.