Decode-and-Forward Repeater Resource Mapping for 5G NR PDSCH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for improved techniques in 5G New Radio (NR) technology to enhance data decoding and forwarding in wireless communication systems, particularly in scenarios involving repeaters, to optimize resource allocation and communication efficiency.
Innovation Solution
A method and apparatus are provided where a wireless device decodes a first physical downlink control channel (PDCCH) to determine a resource allocation for a first physical downlink shared channel (PDSCH), applies a mapping rule to allocate resources for a second PDSCH, and transmits encoded bits to a user equipment (UE) on the second time-frequency resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a repeater simply forwards signals without decoding (traditional amplify-and-forward), then device complexity is reduced, but data loss increases due to error propagation and interference
Solution Approach 1:
The repeater acts as an intermediary node that receives signals from the base station, decodes the data, re-encodes it, and forwards to the UE. This intermediary function with full-duplex capability allows the repeater to eliminate error propagation by decoding incoming signals and regenerate clean signals for forwarding, thereby reducing data loss while managing complexity through specialized hardware design
Solution Approach 2:
The system changes the operational parameters of the repeater by enabling full-duplex transmission (simultaneous transmit and receive on same frequency), adjusting power levels dynamically, and modifying resource allocation patterns. These parameter changes allow the repeater to operate efficiently with both decoding and forwarding functions activated without excessive complexity increase
2Productivity
If the repeater uses full-duplex transmission on the same frequency, then resource allocation efficiency is improved, but self-interference increases
Solution Approach 1:
The system converts the harmful self-interference effect into a beneficial outcome by using the known interference characteristics to pre-cancel interference signals, adjust power levels adaptively, and design resource allocation patterns that exploit the interference structure. This transforms the harmful self-interference into a manageable parameter that can be optimized for better resource utilization
Solution Approach 2:
The repeater implements feedback mechanisms where it monitors its own transmit and receive signals, measures the self-interference level, and adjusts its transmission parameters (power, timing, resource allocation) accordingly. This closed-loop feedback system allows the repeater to maintain full-duplex operation while actively managing and minimizing self-interference effects
3Reliability
If the repeater decodes and re-encodes data, then reliability is improved by eliminating error propagation, but processing time increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring decoding and encoding parameters, pre-allocating processing resources, and preparing buffer memory structures before actual data transmission. This preliminary preparation reduces the critical path processing time during active communication while maintaining the reliability benefits of full decoding and re-encoding operations
Solution Approach 2:
The decoding and encoding process is segmented into parallel processing stages (demodulation, decoding, error checking, re-encoding, remodulation) that can operate concurrently on different data streams. This segmentation of the processing pipeline reduces overall processing time while maintaining the complete decode-and-forward functionality for improved reliability
4Productivity
If mapping rules are applied to allocate second PDSCH resources, then resource allocation optimization is improved, but system complexity increases
Solution Approach 1:
The mapping rules are designed to be self-applying at the UE side based on pre-configured parameters received from the base station. The UE automatically determines the resource allocation for the second PDSCH by applying the mapping rule to the first PDSCH resources without requiring complex centralized scheduling decisions, thereby optimizing resource allocation while minimizing the complexity burden on the network controller
Data Source
AI summary
A wireless device receives a first PDCCH from a base station. The first PDCCH indicates a resource allocation of a first PDSCH transmitted on a first time-frequency resource. The wireless device decodes data carried in the first PDSCH according to the first PDCCH. The wireless device obtains a resource allocation of a second PDSCH based on a mapping rule. The mapping rule maps resources of the first PDSCH to resources of the second PDSCH. The wireless device generates encoded bits for the second PDSCH. The encoded bits are based on the decoded data carried in the first PDSCH and the resource allocation of the second PDSCH. The wireless device generates reference signals associated with the second PDSCH. The wireless device transmits the encoded bits to a user equipment (UE). The encoded bits are transmitted on the resources of the second PDSCH on the second time-frequency resource.