TDD MBSFN Subframe Configuration for Downlink Capacity
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Solution Overview
Problem
In TDD communication systems, existing methods fail to efficiently maximize downlink subframes, leading to suboptimal performance in high downlink load conditions, particularly when TDD cells consist only of downlink subframes, as they do not effectively utilize the second subframe as an MBSFN subframe and require changes to legacy specifications for HARQ-ACK signaling.
Innovation Solution
A method for configuring MBSFN subframes and HARQ-ACK timing in TDD communication systems, where a TDD cell composed only of downlink subframes is treated similarly to an FDD cell, allowing the second subframe to be designated as an MBSFN subframe and using legacy MBSFN configuration information to minimize changes, and employing HARQ-ACK signaling methods similar to FDD systems for TDD secondary cells with only downlink subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a TDD cell is configured with only downlink subframes to maximize downlink capacity, then the downlink load handling capability is improved, but the compatibility with legacy TDD specifications deteriorates
Solution Approach 1:
The patent applies universality by making the TDD cell with only downlink subframes compatible with both legacy TDD specifications and FDD specifications through unified MBSFN configuration. The same configuration method works for both cell types, allowing the system to maximize downlink capacity while maintaining backward compatibility.
Solution Approach 2:
The patent changes the parameter of subframe configuration by allowing the second subframe to be configured as an MBSFN subframe in TDD cells with only downlink subframes. This parameter change enables the system to treat TDD cells similarly to FDD cells, resolving the contradiction between maximizing downlink capacity and maintaining legacy compatibility.
2Productivity
If the second subframe is designated as an MBSFN subframe in TDD cells with only downlink subframes, then the number of available MBSFN subframes is increased, but the complexity of configuration information processing increases
Solution Approach 1:
The patent applies universality by using the same MBSFN configuration information structure for both FDD cells and TDD cells with only downlink subframes. This unified approach increases the number of available MBSFN subframes while avoiding the need for separate processing complexities for different cell types.
Solution Approach 2:
The patent applies copying by using the FDD cell MBSFN configuration information pattern for TDD cells with only downlink subframes. The bitmap structure and processing methodology are copied from FDD to TDD, simplifying the implementation while enabling the second subframe to be configured as MBSFN.
3Productivity
If HARQ-ACK signaling method for FDD cells is applied to TDD secondary cells with only downlink subframes, then the signaling efficiency is improved, but the deviation from legacy TDD procedures increases
Solution Approach 1:
The patent changes the HARQ-ACK signaling parameter by applying FDD-based timing and procedure to TDD secondary cells with only downlink subframes. This parameter change improves signaling efficiency while the patent maintains compatibility by allowing selective application based on cell configuration.
Solution Approach 2:
The patent applies dynamics by making the HARQ-ACK signaling method adaptable rather than fixed. The system can dynamically select between legacy TDD procedures and FDD-based procedures based on the cell type and configuration, optimizing efficiency while maintaining flexibility.
Data Source
AI summary
The present invention provides a method for receiving multimedia broadcast single frequency network (MBSFN) configuration information in a wireless communication system, which is performed by a terminal for which a time division duplex (TDD) cell is configured, the method comprising: receiving the MBSFN configuration information including a bitmap; determining an MBSFN subframe on the basis of the MBSFN configuration information; and performing wireless communication on the basis of the determined MBSFN subframe, wherein the MBSFN configuration information is MBSFN configuration information for a TDD cell comprising only downlink subframes.