TDD UL/DL Configuration Mapping in CoMP Common Search Space
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Solution Overview
Problem
In CoMP scenarios, different transmission/reception points (TP/RPs) in LTE systems cannot have distinct TDD UL/DL configurations, leading to inadequate traffic adaptation and increased interference, especially when sharing the same common search space.
Innovation Solution
The proposed solution involves transmitting uplink/downlink configurations in specific time/frequency resources associated with each TP/RP, where the association between the TP/RP index and the resource index is predefined, allowing each TP/RP to have its own configuration, even when sharing a common search space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple TP/RPs share the same common search space for TDD UL/DL configuration transmission, then signaling overhead is reduced, but different TP/RPs cannot have distinct configurations leading to increased interference and inadequate traffic adaptation
Solution Approach 1:
The patent segments the common search space by associating specific time/frequency resources with specific TP/RPs through predefined index mappings. Each TP/RP transmits configuration information in resources uniquely identified by its index, effectively dividing the shared space into distinct transmission channels without requiring separate physical search spaces for each TP/RP.
Solution Approach 2:
The patent introduces an intermediary indexing mechanism that mediates between multiple TP/RPs and the common search space. The index association acts as a mediator that maps TP/RP identifiers to specific time/frequency resources, enabling distinct configuration transmission while maintaining a unified common search space structure.
2Device complexity
If multiple TP/RPs share the same common search space, then device complexity is reduced, but measurement precision of configuration reception deteriorates due to false detections
Solution Approach 1:
The patent segments the configuration reception process by enabling UEs to identify which TP/RP is transmitting based on the index association with specific time/frequency resources. This segmentation allows UEs to precisely detect configurations from specific TP/RPs even within a shared common search space, reducing false detections while maintaining system structure simplicity.
3Stability of the object's composition
If TDD UL/DL configuration is transmitted in SIB1 with 640ms variation period, then system stability is maintained, but traffic adaptation speed is insufficient for fast changing traffic patterns
Solution Approach 1:
The patent introduces dynamic configuration transmission through the common search space, allowing TDD UL/DL configurations to be updated rapidly in response to traffic changes. The index association mechanism enables flexible reconfiguration of time/frequency resources for different TP/RPs, providing dynamic adaptability while maintaining system stability through the structured indexing approach.
Data Source
AI summary
The present disclosure provides a wireless communication method, a transmission/reception point, a user equipment and a wireless communication system, the wireless communication method comprising a step of: receiving the UL/DL configuration for the UE in a common search space of a specific time/frequency resource associated with a specific TP/RP, wherein, the UE is attached to the specific TP/RP, and the association between a number index of the specific TP/RP and an index of the specific time/frequency resource is predefined.