PDSCH Frequency Resource Mapping for RedCap UE Caching
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Solution Overview
Problem
Rel-18 RedCap UE faces challenges in determining the frequency domain location of PDSCH data due to reduced bandwidth, which affects its ability to cache data efficiently within the maximum 20 MHz bandwidth.
Innovation Solution
Determine a physical resource block PRB index of a second frequency resource using parameters such as a reference PRB index, time slot index, PRB offset, number of PRBs, and update duration to accurately position data within the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the maximum bandwidth of PDSCH is reduced to 5 MHz for RedCap UE, then the cost and complexity of UE are reduced, but the UE cannot determine the frequency domain location of PDSCH data before PDCCH decoding
Solution Approach 1:
The network device pre-configures frequency domain resource allocation parameters (such as PRB offset, resource indication value RIV, or frequency domain resource assignment FRA) for PDSCH before actual data transmission. The UE receives and stores these parameters in advance, enabling it to immediately determine the 5 MHz PDSCH frequency location within its limited bandwidth capability without waiting for PDCCH decoding during data reception.
Solution Approach 2:
A frequency domain resource indication mechanism acts as an intermediary between the network's scheduling decision and the UE's data reception. The network embeds frequency location information in the pre-configured parameters or in a compact form in PDCCH, which the UE uses to map the scheduled PDSCH to its 5 MHz bandwidth capability, bridging the gap between network scheduling flexibility and UE bandwidth limitation.
2Measurement precision
If the UE waits for PDCCH decoding to determine PDSCH frequency location, then accurate frequency domain resource allocation is achieved, but data caching efficiency is reduced
Solution Approach 1:
The frequency domain resource allocation parameters are determined and communicated to the UE in advance through pre-configuration or compact indication mechanisms. This allows the UE to calculate the exact PDSCH frequency location (PRB indices within 5 MHz bandwidth) before actual data reception begins, eliminating the need to wait for full PDCCH decoding while maintaining precise frequency domain resource allocation.
Solution Approach 2:
The patent changes the parameter representation format for frequency domain resources from full PDCCH-based resource allocation to pre-configured parameters such as PRB offset relative to a reference point, or compressed resource indication values (RIV) that map to specific 5 MHz bandwidth locations. This parameter transformation enables faster UE-side calculation while preserving accurate frequency domain resource identification.
Data Source
AI summary
The present application discloses a data sending method, a data receiving method, a communication node, and a storage medium. The sending method comprises: determining a target physical resource block (PRB) index according to a first parameter, wherein the first parameter comprises at least one of the following: a reference PRB index, a time slot index, a PRB offset, the number of PRBs comprised in a first frequency resource, a second frequency resource position update duration, and an indication of the second frequency resource; determining a second frequency resource according to the target PRB index; and sending data within the second frequency resource.