M-TRP Random Access Synchronization Across Unsynchronized TRPs
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Solution Overview
Problem
Existing multiple-transmission-and-reception-point (M-TRP) communication systems face challenges with unsynchronized transmissions between TRPs, particularly in scenarios where TRPs are located far apart or belong to different cells, leading to inefficiencies in UE communication.
Innovation Solution
A method for M-TRP communication involving a UE and a RAN node that includes configuring a random access procedure with an indication of a random access preamble associated with a second TRP, transmitting this preamble to the second TRP, and receiving a timing advance value from the first TRP, along with corresponding apparatuses for implementing these methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If mTRP operation is implemented with unsynchronized TRPs, then coverage area is expanded, but transmission synchronization deteriorates
Solution Approach 1:
The patent applies preliminary action by performing random access procedure before actual data transmission to establish timing synchronization. The UE transmits a random access preamble to the second TRP, receives a random access response with timing advance information from the first TRP, and adjusts its transmission timing accordingly before engaging in mTRP communication. This preliminary synchronization step enables the system to handle unsynchronized TRPs while maintaining transmission stability.
2Adaptability or versatility
If random access procedure is configured with indication of second TRP preamble, then UE can access second TRP, but procedure complexity increases
Solution Approach 1:
The patent applies universality by making the random access procedure multi-functional. The same random access procedure mechanism is used to achieve both initial TRP selection and timing synchronization for unsynchronized TRPs. The random access response from the first TRP serves dual purposes: confirming the preamble transmission and providing timing advance information for synchronization. This multi-functionality reduces the need for separate procedures while enabling versatile TRP access.
3Stability of the object's composition
If timing advance value is received from first TRP for second TRP transmission, then transmission timing is synchronized, but information transmission time is increased
Solution Approach 1:
The patent applies merging by combining the random access procedure with the timing synchronization function. Instead of having separate procedures for TRP selection and timing adjustment, the random access response from the first TRP simultaneously provides both access confirmation and timing advance information. This merged approach reduces the number of separate communication rounds needed, thereby minimizing the overall time loss while achieving proper synchronization.
Data Source
AI summary
A method of multiple-transmission-and-reception-point (M-TRP) communication in a user equipment (UE) includes receiving (596), from a radio access network (RAN) node equipped with a first transmission and reception point (TRP) and a second TRP, a configuration for initiating a random access procedure, the configuration including an indication of a random access preamble associated with a second TRP of the RAN node; transmitting (566), to the second TRP, the random access preamble; and receiving (573), from the first TRP, a random access response including a timing advance (TA) value associated with the second TRP.