Asymmetric TRP Random Access With UE-Aware Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing random access procedures in asymmetric transmission and reception point (TRP) deployments, particularly in scenarios where one TRP supports both downlink and uplink transmissions while others support only uplink, leading to inefficiencies in resource allocation and increased latency.
Innovation Solution
The system enables a UE to transmit random access preambles and receive a response message indicating configurations for multiple TRPs, allowing it to select and transmit PUSCH based on specific TRP configurations, including beam usage and power management, to optimize communication in asymmetric TRP environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If asymmetric TRP deployment is implemented to improve resource allocation efficiency, then resource utilization improves, but system complexity increases due to different TRP configurations
Solution Approach 1:
The system segments TRPs into different types (first type with both DL and UL, second type with UL only) and assigns different configuration sets to each type. This segmentation allows efficient resource allocation by matching TRP capabilities with appropriate configurations, while the network device manages the complexity by maintaining separate configuration sets for different TRP types.
Solution Approach 2:
Different configuration sets are applied to different TRPs based on their specific capabilities. First type TRPs receive configurations applicable to both downlink and uplink, while second type TRPs receive configurations applicable only to uplink. This local quality approach optimizes resource allocation for each TRP's specific function without requiring all TRPs to have identical configurations.
2Adaptability or versatility
If multiple configuration sets are maintained for different TRP types, then adaptability to asymmetric deployments improves, but device complexity increases
Solution Approach 1:
The network device maintains multiple configuration sets that can be universally applied to different TRP types based on their capabilities. The first configuration set is universally applicable to first type TRPs (both DL and UL), while the second configuration set is universally applicable to second type TRPs (UL only). This multi-functionality approach allows the system to adapt to asymmetric deployments while the network device manages the complexity of maintaining multiple configuration sets.
3Loss of time
If random access procedure is optimized for asymmetric TRP, then access latency reduces, but processing complexity increases
Solution Approach 1:
The network device pre-configures multiple configuration sets corresponding to different TRP types before the random access procedure begins. When a UE transmits a random access preamble, the network device can immediately identify the appropriate configuration set based on which TRP received the preamble, eliminating the need for complex real-time configuration selection during the random access procedure. This preliminary action reduces access latency while the network device manages the processing complexity of maintaining pre-configured sets.
Data Source
AI summary
Various aspects of the present disclosure relate to random access procedures for asymmetric transmission and reception point (TRP) deployments, such as when a user equipment (UE) is in a radio resource control (RRC)-idle mode of operation. The disclosure provides random access procedures for a UE, where available TRPs have different or asymmetric configurations (e.g., one TRP being applicable for downlink (DL) and uplink (UL) and one TRP being applicable for only UL). For example, the UE may transmit a random access preamble and receive a random access response message that identifies the configurations of available TRPs. Based on the identified configurations, the UE may perform random access and connect, or re-connect, with a network.