PDSCH Rate Matching Across Multiple TTIs
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently scheduling and transmitting downlink data channels, particularly in achieving reduced latency and increased reliability, due to limitations in scheduling and resource allocation methods.
Innovation Solution
The method involves transmitting and receiving a physical downlink shared channel (PDSCH) based on rate matching information obtained from the physical downlink control channel (PDCCH), with the same rate matching information being used across multiple transmission time intervals (TTIs), allowing for efficient scheduling and repeated transmission of data to enhance reliability and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink data channel is transmitted using conventional scheduling methods in LTE, then system compatibility is maintained, but latency is high and reliability is insufficient
Solution Approach 1:
The base station performs rate matching in advance based on predicted channel conditions and prepares pre-coded data blocks before actual transmission. This preliminary preparation allows the UE to quickly decode received signals without waiting for extensive channel estimation and coding operations during each transmission interval, thereby reducing latency while maintaining reliable transmission through pre-optimized coding schemes
Solution Approach 2:
The system dynamically adjusts rate matching parameters and transmission configurations based on real-time channel state information and traffic conditions. The base station can flexibly modify coding rates, resource allocation, and modulation schemes across different transmission time intervals, enabling adaptive optimization that simultaneously improves reliability through error correction and reduces latency by selecting faster transmission modes when channel conditions permit
2Productivity
If rate matching information is separately determined for each TTI, then transmission flexibility is high, but scheduling complexity increases and efficiency decreases
Solution Approach 1:
A single rate matching configuration message from the base station serves multiple transmission time intervals simultaneously, defining universal rate matching parameters that apply across TTIs. This multi-functional approach allows the same configuration to govern resource allocation, coding rates, and resource element mapping for several consecutive transmissions, thereby simplifying scheduling operations and improving efficiency without completely sacrificing the ability to adapt to changing conditions through periodic reconfiguration
Data Source
AI summary
Disclosed is a method by which a terminal receives a physical downlink shared channel (PDSCH) in a wireless communication system. Particularly, the method comprises: receiving a physical downlink control channel (PDCCH) for scheduling the PDSCH; acquiring, from the PDCCH, rate matching information for the PDSCH; and receiving the PDSCH at a plurality of transmission time intervals (TTIs) on the basis of the rate matching information, wherein the rate matching information is identically used for the plurality of TTIs.