E-PDCCH Resource Allocation in PDSCH Region
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Solution Overview
Problem
In wireless communication systems, especially in Distributed Multi-Node Systems, there is a challenge in efficiently allocating resources to physical channels and transmitting control information due to the increasing number of devices and data requirements, leading to bottlenecks in control channel capacity.
Innovation Solution
The method involves receiving and transmitting Control Format Indicator (CFI) information to allocate Orthogonal Frequency Division Multiplexing (OFDM) symbols for Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) regions, allowing for efficient resource allocation and control information transmission by positioning the Enhanced PDCCH (E-PDCCH) in the PDSCH region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control information is transmitted only in the PDCCH region, then control channel transmission is simple and structured, but the control channel capacity is limited and cannot meet the increasing data requirements of multiple devices
Solution Approach 1:
The patent merges the control channel transmission function with the data channel (PDSCH) by positioning E-PDCCH within the PDSCH region. This allows control information to be transmitted alongside data, effectively combining two functions into one region and increasing overall control channel capacity without requiring a completely separate structure.
Solution Approach 2:
The patent transitions control channel transmission from a single-dimensional approach (only in PDCCH region) to a two-dimensional approach by allowing E-PDCCH to be positioned in both time and frequency resources within the PDSCH region. This dimensional expansion provides additional resources for control information transmission.
2Quantity of substance
If the PDCCH region size is increased to accommodate more control information, then control channel capacity improves, but the available data transmission resources in PDSCH region decrease
Solution Approach 1:
The patent utilizes the PDSCH region in both time and frequency dimensions to transmit E-PDCCH. By employing resource blocks (RBs) and specific symbol positions within the PDSCH region, the system can transmit control information without reducing the overall PDSCH region size, as the control and data channels coexist in different resource allocations within the same region.
3Adaptability or versatility
If E-PDCCH is positioned in the PDSCH region, then control channel capacity increases and resource allocation flexibility improves, but the complexity of resource management and channel positioning increases
Solution Approach 1:
The patent segments the PDSCH region into specific resource blocks (RBs) and symbol positions that are allocated to E-PDCCH. By dividing the available resources into distinct segments for control and data transmission, the system achieves flexible resource allocation while maintaining manageable complexity through structured resource element (RE) mapping rules.
Solution Approach 2:
The patent applies different resource allocation characteristics to different parts of the PDSCH region. Specific RBs and symbol positions are designated with control channel properties (for E-PDCCH), while other regions maintain data channel properties. This local differentiation enables flexible resource allocation without requiring complete reconfiguration of the entire system.
Data Source
AI summary
In a wireless communication system, when a terminal receives control information from a downlink subframe, which is divided into a Physical Downlink Control Channel (PDCCH) region and a Physical Downlink Shared Channel (PDSCH) region, in a wireless communication system, the receiving of the control information includes: receiving, from a base station, first CFI information indicating the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for Physical Downlink Control Channel (PDCCH) transmission; receiving, from the base station, second CFI information indicating start OFDM symbol information available for Physical Downlink Shared Channel (PDSCH) transmission corresponding to an enhanced Physical Downlink Control Channel (E-PDCCH); and receiving the PDSCH from the base station on the basis of the first CFI information or the second CFI information. The PDCCH is placed in the PDCCH region of the downlink subframe, and the E-PDCCH is placed in the PDSCH region of the downlink subframe.