Bandwidth Part Switching via DCI Zero Padding
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Solution Overview
Problem
In 5G mobile communication systems, when the size of downlink control information (DCI) fields interpreted in active bandwidth parts is smaller than required, user equipment (UE) may not operate according to the base station's scheduling intentions, leading to inefficiencies in communication.
Innovation Solution
The UE employs zero padding to interpret DCI fields, allowing it to determine whether to switch activated bandwidth parts based on the bandwidth part indicator field, and receives physical downlink shared channels (PDSCHs) accordingly, ensuring correct scheduling information interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses the DCI fields size from the active bandwidth part, then the DCI processing is simple, but the UE cannot correctly interpret scheduling information when bandwidth part switching occurs
Solution Approach 1:
The patent applies dynamics by making the DCI field size adaptive rather than static. The UE dynamically determines the DCI field size based on the indicated bandwidth part configuration rather than always using the active bandwidth part configuration. This allows the system to adjust the interpretation behavior according to the specific bandwidth part being targeted, resolving the contradiction between simple processing and accurate interpretation during bandwidth part switching.
Solution Approach 2:
The patent changes the parameter used for DCI field size determination from the active bandwidth part configuration to the indicated bandwidth part configuration. By switching which configuration parameter is applied (active vs. indicated BWP), the UE can correctly interpret DCI fields regardless of whether bandwidth part switching is occurring, thus improving reliability without significantly increasing complexity.
2Adaptability or versatility
If the UE performs bandwidth part switching based on DCI, then communication flexibility is improved, but DCI field size mismatches cause interpretation errors
Solution Approach 1:
The patent makes the DCI interpretation process dynamic by linking it to the bandwidth part indicator field. When bandwidth part switching is indicated, the UE dynamically switches to using the indicated bandwidth part configuration for DCI field size determination. This dynamic adaptation ensures that DCI fields are always interpreted with the correct size expectation, maintaining precision even as bandwidth part switching provides flexibility.
Solution Approach 2:
The patent introduces an intermediary mechanism where the bandwidth part indicator field in the DCI serves as a mediator between the current active bandwidth part and the target bandwidth part. This intermediary allows the UE to temporarily use the indicated bandwidth part's configuration parameters (including field sizes) for interpreting the DCI, ensuring accurate interpretation during the transition without sacrificing the flexibility of bandwidth part switching.
3Productivity
If the DCI format is optimized for the active bandwidth part, then transmission efficiency is high, but it fails to accommodate switching to different bandwidth parts
Solution Approach 1:
The patent applies dynamics by making the DCI interpretation adaptive to the target bandwidth part when switching is indicated. The UE dynamically selects which bandwidth part configuration to use for field size determination based on the bandwidth part indicator. This allows a single DCI format to efficiently serve both the current active bandwidth part and potential target bandwidth parts, maintaining transmission efficiency while enabling flexible switching.
Solution Approach 2:
The patent makes the DCI format universal by enabling it to be correctly interpreted for multiple bandwidth parts. By using the indicated bandwidth part's configuration for field size determination when switching is indicated, the same DCI format can accommodate both active and target bandwidth parts. This multi-functionality allows the DCI to efficiently support bandwidth part switching without requiring separate optimized formats for each bandwidth part.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for interpreting a DCI field in case that a BWP is switched by a UE that has received multi PDSCH scheduling and multi PUSCH scheduling configuration is provided. The method includes receiving a RRC message comprising a TDRA table information for scheduling multiple PDSCHs for at least one bandwidth part from a base station, receiving DCI comprising a bandwidth part indicator field and a TDRA field from an activated BWP, determining whether to switch the activated BWP, based on the bandwidth part indicator field, and when the bandwidth part indicator field indicates switching the activated BWP, receiving at least one PDSCH in an indicated BWP, based on at least one of the TDRA field, first TDRA table information of the activated BWP, or second TDRA table information of the indicated BWP.