PDSCH Resource Allocation for New Carrier Types
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Solution Overview
Problem
Current LTE systems lack an effective solution for PDSCH transmission, particularly in determining resource allocation schemes and transmission schemes for new carrier types and formats, leading to inefficiencies in decoding PDSCH.
Innovation Solution
A method and apparatus for PDSCH transmission that involves detecting a downlink control channel, determining resource allocation schemes based on DCI formats and carrier attributes, and decoding PDSCH using specific VRB to PRB mapping mechanisms and transmission schemes such as random beamforming or DMRS-based transmit diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new carrier type is introduced for PDSCH transmission, then transmission capacity and flexibility are improved, but compatibility with existing LTE systems deteriorates
Solution Approach 1:
The patent changes the parameter of VRB to PRB mapping mechanism based on the carrier type. For new carrier types, a specific mapping mechanism is applied where the VRB index directly maps to PRB index in both even and odd timeslots, differentiating it from legacy carriers. This parameter change enables the system to adapt to new carrier types while maintaining reliable decoding through defined mapping rules.
2Productivity
If resource allocation type 2 with specific VRB to PRB mapping is used for new carrier types, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by implementing different VRB to PRB mapping mechanisms for different carrier types. Specifically, for new carrier types with DCI format 1A and VRB assignment flag equal to 1, a dedicated mapping mechanism is used where VRB index directly corresponds to PRB index in both even and odd timeslots. This localized approach optimizes transmission efficiency for new carriers without affecting legacy carrier operations.
3Adaptability or versatility
If VRB assignment flag is used to indicate mapping mechanism, then resource allocation flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges the VRB assignment flag functionality with the carrier type identification. The flag value of 1, when combined with DCI format 1A, specifically indicates the new carrier type mapping mechanism. This merging approach provides resource allocation flexibility for new carriers while minimizing control signaling overhead by reusing existing DCI structures rather than introducing separate signaling elements.
Data Source
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AI summary
Embodiments of the present invention provide a PDSCH transmission method and apparatus. The method includes: detecting a downlink control channel for scheduling a PDSCH; determining a resource allocation scheme of the PDSCH according to a DCI format of the downlink control channel for scheduling the PDSCH and an attribute of a carrier for carrying the PDSCH; and decoding the PDSCH according to the resource allocation scheme of the PDSCH and a transmission scheme of the PDSCH. The embodiments of the present invention provide an effective solution to PDSCH transmission.