LTE-A Control Signal Mapping to Shared Resource Blocks
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Solution Overview
Problem
In LTE-A systems, the shortage of resources in PDCCH mapping regions due to an increase in terminals leads to a decrease in system throughput, as DL data cannot be assigned even when available PDSCH regions are not utilized, causing a potential decrease in system throughput.
Innovation Solution
A transmitting and receiving apparatus that maps control signals to resource regions usable for both control and data channels, allowing for efficient data resource allocation by setting first and second data resource regions within a resource block group based on the number of streams and antenna ports used, thereby avoiding collisions between allocation control signals and data resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control signals are mapped to PDCCH regions, then control signal transmission is achieved, but resource shortage occurs leading to decreased system throughput
Solution Approach 1:
The patent merges the PDCCH region and PDSCH region by allowing control signals to be mapped to resource blocks that are also usable for data transmission. This is achieved by defining a first data resource region within an RBG that can overlap with the control signal region, enabling both control and data transmission to share the same physical resources without complete separation, thus increasing system throughput while maintaining control signal reliability
Solution Approach 2:
The patent introduces a new dimension of resource allocation by allowing control signals to be transmitted on the same frequency-time resources as data signals through the concept of a first data resource region within an RBG. This dimensional overlap enables the system to utilize previously underutilized PDSCH regions for control signal transmission, effectively increasing the capacity without requiring additional dedicated control channels
2Productivity
If data resource region is increased, then system throughput improves, but collision between control signals and data resources occurs
Solution Approach 1:
The patent applies local quality by differentiating the resource allocation based on the specific characteristics of control signals versus data signals. It defines a first data resource region within an RBG that is specifically configured to avoid collision with control signals, while still allowing data transmission. This localized differentiation ensures that control signals and data signals share resources efficiently without interfering with each other, maintaining both throughput and reliability
Data Source
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AI summary
In a base station (100), when the number of layers employed is 1 and the employed antenna port and the antenna port used for transmitting the allocation control signal are the same, a transmission controller (102) sets a first data resource region inside a first resource region, in a resource block group (RBG), that can be used for the control channel or the data channel. When the number of layers employed is 1 and the employed antenna port and the antenna port used for transmitting the allocation control signal are different, a transmission controller (102) sets a second data resource region inside the first resource region in the RBG. The second data resource region is larger than the first data resource region.