PDSCH Resource Allocation via Fixed OFDM Symbol Positioning
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Solution Overview
Problem
In wireless communication systems, the uncertainty in Physical Downlink Control Channel (PDCCH) size leads to errors in resource allocation for Physical Downlink Shared Channel (PDSCH) transmission, affecting data reception.
Innovation Solution
A method is introduced where resources for PDSCH transmission are allocated from a fixed specific OFDM symbol within a subframe, either in a time forward or backward order, to stabilize resource allocation regardless of PDCCH size changes, using higher layer radio resource control signaling to inform User Equipment (UE) of control channel transmission symbols and resource mapping start locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources for PDSCH transmission are allocated dynamically based on PDCCH size, then resource utilization efficiency is improved, but resource allocation accuracy deteriorates due to uncertainty in PDCCH size
Solution Approach 1:
The patent applies preliminary action by pre-determining the starting OFDM symbol position for PDSCH resource allocation before actual data transmission. The base station informs the UE of the control channel transmission symbol position and resource mapping start location in advance through higher layer signaling, allowing the UE to prepare the correct reception parameters beforehand. This resolves the contradiction by establishing resource allocation boundaries in advance, eliminating the uncertainty caused by dynamic PDCCH size changes while maintaining efficient resource utilization.
2Adaptability or versatility
If PDCCH size is allowed to vary to accommodate different control information, then adaptability is improved, but reliability of PDSCH resource allocation deteriorates
Solution Approach 1:
The patent extracts the source of uncertainty by separating the control channel transmission parameters from the data channel resource allocation parameters. By independently specifying the control channel transmission symbol position and the PDSCH resource mapping start location through higher layer signaling, the patent removes the dependency between variable PDCCH size and PDSCH allocation. This allows PDCCH size to vary for adaptability while PDSCH resource allocation remains reliable based on the pre-informed mapping parameters.
3Productivity
If resource mapping follows PDCCH transmission dynamically, then resource efficiency is improved, but error rate in data reception increases
Solution Approach 1:
The patent introduces an intermediary mechanism through higher layer signaling that mediates between the dynamic PDCCH transmission and the PDSCH resource allocation. The base station uses higher layer signaling to inform the UE of the resource mapping start location, which acts as an intermediary parameter that decouples the direct dynamic relationship between PDCCH size and PDSCH allocation. This intermediary ensures accurate resource mapping while maintaining resource efficiency, preventing reception errors.
Data Source
AI summary
A method is described for receiving a physical signal by a communication apparatus in a wireless communication system supporting carrier aggregation of a first component carrier and a second component carrier. The communication apparatus receives a physical downlink control channel (PDCCH) signal on the first component carrier. The communication apparatus also receives a physical downlink shared channel (PDSCH) signal corresponding to the PDCCH signal on the second component carrier. The first component carrier is different from the second component carrier. A starting orthogonal frequency division multiplexing (OFDM) symbol for receiving the PDSCH signal is determined according to information received via a radio resource control (RRC) signal.