R-PDCCH Resource Region Mapping for LTE-A SPS Throughput
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Solution Overview
Problem
In LTE-A systems, the shortage of resources in the PDCCH region due to an increase in the number of terminals leads to a decrease in system throughput, as control signals cannot be mapped, and the existing methods do not support Semi-Persistent Scheduling (SPS) between base stations and relay stations, resulting in inefficient data transmission.
Innovation Solution
A transmission apparatus and method that map control signals to a resource region usable for both control and data channels, distributing data across multiple subframes, using a resource block group formed of multiple resource blocks, allowing for efficient data transmission by setting the control resource region in the first subframe and using it as a data resource in subsequent subframes, thereby reducing waste and enabling UL grant transmission for DL data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control signals are transmitted in the PDCCH region, then control signal transmission is ensured, but resource shortage occurs due to increase in number of terminals
Solution Approach 1:
The patent allows the same resource region to serve dual purposes: functioning as a control channel region (PDCCH) in some subframes and as a data channel region in other subframes. This multi-functionality enables the system to accommodate more terminals by dynamically switching resource usage, thereby resolving the contradiction between ensuring control signal transmission and preventing resource shortage.
2Reliability
If control signals are mapped to resource regions, then control functionality is maintained, but data transmission efficiency decreases due to resource waste
Solution Approach 1:
The patent implements periodic switching between control channel transmission and data channel transmission in the same resource region. By alternating the function of the resource region across different subframes (control in first subframe, data in second subframe), the system maintains control functionality while maximizing data transmission efficiency and eliminating resource waste.
3Area of stationary object
If relay stations are added to extend coverage, then coverage area increases, but system complexity increases
Solution Approach 1:
The patent merges the control channel function and data channel function into the same resource region, allowing relay stations to efficiently handle both control and data transmissions. This integration reduces the overall system complexity by eliminating the need for separate dedicated control and data resource allocations, while still achieving extended coverage through relay station deployment.
Data Source
AI summary
A base station (100) transmits a DL grant for a terminal (200) by mapping it to an R-PDCCH region, thus transmitting a series of data groups to the terminal (200) by the SPS method. A transmission control unit (102) sets in the R-PDCCH region a control resource region which maps a data resource and the DL grant in a resource block group common in frames to be transmitted by the SPS method.A resource region which was defined as a control resource region in a first frame to be transmitted among a plurality of frames to be transmitted is defined as a data resource in a second or subsequent frame to be transmitted.