DFT-S-OFDM PDCCH Transmission via Precoding Size Notification
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Solution Overview
Problem
In 5G wireless communication systems, efficiently transmitting physical downlink control channels (PDCCHs) is challenging due to the need for blind decoding of DFT-S-OFDM signals, which increases complexity for user equipment (UE) and requires notification of DFT precoding size, especially in ultrahigh frequency bands where coverage is limited.
Innovation Solution
The method involves a base station (BS) transmitting PDCCHs with information about the DFT precoding size, allowing user equipment (UE) to perform blind decoding based on this information, thereby defining a search space in a resource domain corresponding to the notified DFT size, and applying DFT-S-OFDM precoding to ensure efficient transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If blind decoding is performed on DFT-S-OFDM signals without prior notification of DFT precoding size, then the UE can operate autonomously, but the decoding complexity increases significantly
Solution Approach 1:
The base station performs preliminary action by notifying the UE of the DFT precoding size through DCI before the UE performs blind decoding. This advance information provision allows the UE to configure its decoder appropriately, significantly reducing decoding complexity while maintaining autonomous operation capability.
2Device complexity
If DFT precoding size information is explicitly conveyed through DCI, then blind decoding complexity is reduced, but the signaling overhead increases
Solution Approach 1:
The invention changes the parameter representation by using compact DCI fields to convey DFT precoding size information. Instead of transmitting full configuration details, the system uses optimized parameter encoding that reduces signaling overhead while providing sufficient information for the UE to perform efficient blind decoding.
3Length of stationary object
If coverage is extended in ultrahigh frequency bands, then transmission range increases, but propagation loss increases
Solution Approach 1:
The system changes transmission parameters by dynamically adjusting DFT precoding sizes based on channel conditions and coverage requirements. This parameter adaptation allows the system to optimize the balance between transmission range and propagation loss in ultrahigh frequency bands, enabling extended coverage while managing energy loss through efficient precoding configurations.
Data Source
AI summary
In a wireless communication system according to an embodiment, a method of receiving, by a user equipment (UE), physical downlink control channels (PDCCHs) based on discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM) includes receiving, from a base station (BS), a first PDCCH including first downlink control information (DCI) in which information about a size of DFT precoding applied to a second PDCCH is included; performing blind decoding on the first PDCCH to obtain the first DCI; receiving the second PDCCH including second DCI from the BS; and performing blind decoding on the second PDCCH to obtain the second DCI, based on the information about the size of DFT precoding applied to the second PDCCH included in the first DCI.