LTE Relay Subframe Configuration for R8 Compatibility
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Solution Overview
Problem
The existing relay transmission methods in LTE systems are not compatible with User Equipment (UE) in the LTE R8 system, hindering seamless integration and compatibility in LTE-Advanced networks.
Innovation Solution
A relay transmission method that configures relay link subframes in integer multiples of a frame, with adjustable guard periods and specific HARQ timelines, ensuring compatibility with LTE FDD system constraints and allowing backward compatibility with LTE R8 UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay transmission is performed according to the frame structure in prior art, then relay transmission can be implemented, but compatibility with LTE R8 UE cannot be ensured
Solution Approach 1:
The frame structure is segmented into different subframe types: MBSFN subframes for relay transmission and non-MBSFN subframes for direct LTE communication. This segmentation allows relay functionality and LTE R8 compatibility to operate in separate time resources, resolving the contradiction between implementing relay transmission and maintaining compatibility with LTE R8 UE.
Solution Approach 2:
MBSFN subframes serve as an intermediary mechanism that enables relay transmission without affecting LTE R8 UE operation. By confining relay-specific transmissions to MBSFN subframes while using non-MBSFN subframes for traditional LTE communication, the system mediates between the requirements of relay functionality and backward compatibility.
2Adaptability or versatility
If guard period length is fixed, then configuration is simple, but cannot adapt to different relay transmission requirements
Solution Approach 1:
The guard period length is made dynamic and configurable rather than fixed. The system allows the guard period to be adjusted according to specific relay transmission requirements, enabling adaptation to different scenarios while maintaining reasonable configuration complexity through standardized adjustment mechanisms.
Solution Approach 2:
The guard period parameter can be changed according to different relay transmission scenarios. By allowing this parameter to be configurable, the system adapts to varying transmission requirements without requiring complete redesign of the frame structure, balancing adaptability with implementation simplicity.
Data Source
AI summary
A relay transmission method and a network node are disclosed. The method includes: receiving configuration information about a relay link subframe, the relay link subframe is configured in subframes in a period equivalent to an integer multiple of one frame, where the relay link subframe takes on a specific HARQ timeline; and performing relay link transmission according to the relay link subframe. The relay transmission method put forward herein meets various constraint conditions of the LTE FDD system in the relay transmission performed according to the selected relay link subframe, and is backward-compatible with the UE in the existing LTE system.