Multi-TRP RACH Configuration for Wireless Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing wireless signal transmission and reception procedures, particularly in managing random access channel (RACH) operations across multiple transmission and reception points (TRPs) in a multi-cell environment, which affects uplink scheduling and resource allocation.
Innovation Solution
A method and apparatus for a user equipment (UE) to configure multiple TRPs using resources from different cells, receive RACH configuration information, transmit RACH-related messages, and perform uplink scheduling on a physical uplink shared channel (PUSCH), including specific MAC control elements and UE identifiers, to facilitate efficient inter-cell multi-transmission and reception point operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RACH operations are performed across multiple TRPs in a multi-cell environment, then wireless signal transmission efficiency is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the multi-TRP RACH operation into distinct phases: RACH configuration information reception, RACH message transmission to first TRP, response reception from second TRP, and uplink scheduling. This segmentation allows the UE to handle complex multi-TRP operations through structured, manageable steps, resolving the contradiction between improved transmission efficiency and increased operational complexity
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE receives RACH configuration information that includes resource allocation for multiple cells/TRPs. This configuration information acts as an intermediary that coordinates the interactions between the UE and multiple TRPs, enabling efficient multi-TRP operation while managing complexity through pre-defined resource allocation rules
2Productivity
If multiple TRPs are configured using resources from different cells, then resource allocation efficiency is improved, but timing synchronization difficulty increases
Solution Approach 1:
The patent applies preliminary action by having the UE receive RACH configuration information in advance, which includes resource allocation information for multiple cells. This pre-configuration enables the UE to perform timing advance adjustments and synchronize with multiple TRPs before actual data transmission begins, thereby improving resource allocation efficiency while minimizing timing synchronization delays during operation
3Adaptability or versatility
If RACH is triggered for a cooperating cell, then uplink scheduling flexibility is improved, but message transmission complexity increases
Solution Approach 1:
The patent applies local quality by distinguishing different message transmission paths: RACH messages are transmitted to a first TRP (cooperating cell) while responses are received from a second TRP (serving cell). This local differentiation allows the system to optimize each transmission path independently, improving uplink scheduling flexibility while managing message transmission complexity through specialized handling of each TRP's specific role
Data Source
AI summary
The present disclosure discloses a method of receiving a signal by a user equipment (UE) in a wireless communication system, including configuring a first transmission and reception point (TRP) using resources of a first cell and a second TRP using resources of a second cell, receiving random access channel (RACH) configuration information including resource allocation information for the first cell, based on an RACH being triggered for the first cell, transmitting an RACH-related message based on the RACH configuration information, receiving a response to the RACH-related message, and transmitting uplink scheduling information on a physical uplink shared channel (PUSCH) based on the response.