UE Independent PDSCH Scrambling for Interference Cancellation
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Solution Overview
Problem
Current communication networks face challenges in effectively canceling inter-cell and intra-cell interference in physical downlink shared channels (PDSCH) due to limitations in user equipment (UE) independent scrambling methods, which affect signal reception quality.
Innovation Solution
The introduction of a new transmission mode with user equipment (UE) independent PDSCH scrambling, utilizing a post-decoding Minimum Mean Squared Error with Successive Interference Cancellation (MMSE-SIC) receiver and additional Radio Network Temporary Identifiers (RNTIs) for PDSCH scrambling, allows UEs to decode and cancel interfering signals, improving signal reception by configuring PDSCH RNTI own and PDSCH RNTI int for specific UE operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE independent PDSCH scrambling is used for interference cancellation, then signal reception quality is improved, but control-channel signaling overhead increases
Solution Approach 1:
The patent segments the RNTI configuration into two distinct types: PDSCH-RNTI-own for the user equipment's own PDSCH and PDSCH-RNTI-int for interfering PDSCH. This segmentation allows independent configuration and optimization of scrambling sequences for different interference scenarios, enabling effective interference cancellation while managing control signaling overhead through selective configuration.
2Reliability
If additional RNTIs are configured for PDSCH scrambling, then interference cancellation capability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal PDSCH scrambling mechanism where the same PDSCH-RNTI-own is used both for generating the scrambling sequence for the user equipment's own PDSCH and for enabling other UEs to cancel interference from this PDSCH. This multi-functionality reduces the need for separate configuration mechanisms while maintaining enhanced interference cancellation capability.
3Adaptability or versatility
If network scheduling flexibility is maintained, then adaptability is improved, but interference cancellation effectiveness may be reduced
Solution Approach 1:
The patent enables dynamic configuration of PDSCH-RNTI-own and PDSCH-RNTI-int parameters through network signaling, allowing the network to adaptively adjust scrambling sequences based on current interference conditions and scheduling decisions. This dynamic approach maintains network scheduling flexibility while ensuring effective interference cancellation through context-aware configuration.
Data Source
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AI summary
A method and apparatus for a transmission mode with user equipment (UE) independent physical downlink shared channel (PDSCH) scrambling for inter-cell and intra-cell PDSCH-to-PDSCH interference cancellation. A method may include configuring (610) a first identifier (e.g. first RNTI) for a first UE. The method may also include performing at least one of indicating (620) (e.g. semi- statically) a second identifier (e.g. PDSCH RNTI own) for the first UE, or indicating (630) (e.g. semi-statically) a third identifier (e.g. PDSCH RNTIJnt) for the first UE. The first identifier (e.g. first RNTI) is for at least one of operation of physical downlink control channel (PDCCH) of the first UE, or operation of PDSCH of the first UE if the second identifier (e.g. PDSCH RNTI own) is not indicated to the first UE; the second identifier (e.g. PDSCH RNTI own) is for at least one of scrambling or descrambling PDSCH of the first UE; and the third identifier (e.g. PDSCH RNTIJnt) is for at least one of scrambling or descrambling a PDSCH of a second (e.g. interfering) UE. The transmission of the second UE may cause interference on the reception of a PDSCH at the first UE.