UL-Only TRP Signaling and Timing Advance Configuration
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Solution Overview
Problem
Current technologies fail to provide effective solutions for configuring user equipment (UE) to communicate with a UL-only transmission and reception point (TRP) while maintaining optimal uplink (UL) and downlink (DL) communication parameters.
Innovation Solution
The techniques described involve configuring a UE to communicate with a UL-only TRP operating in coordination with a main TRP, including determining proper timing advance (TA) for UL communications, controlling UL transmission power, and managing beams for UL communications between the UE and the UL-only TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UL-only TRP is configured for UE communication, then uplink communication efficiency is improved and interference is reduced, but downlink communication capability is lost
Solution Approach 1:
The system segments the communication functionality by separating the TRP into UL-only mode and DL-capable main TRP mode. This allows the UL-only TRP to specialize in uplink communications, improving efficiency and reducing interference, while the main TRP handles downlink communications, thus resolving the contradiction between UL efficiency and DL capability.
2Reliability
If timing advance is adjusted for UL-only TRP communication, then uplink synchronization is improved, but communication complexity increases
Solution Approach 1:
The main TRP acts as an intermediary that receives timing advance information from the UL-only TRP and relays it to the UE. This allows the UL-only TRP to maintain simple synchronization procedures while still achieving accurate timing alignment, as the main TRP handles the complex coordination and information exchange.
3Use of energy by moving object
If transmission power is controlled for UL-only TRP, then power consumption is optimized, but control overhead increases
Solution Approach 1:
The main TRP serves as a mediator that receives power control commands from the network and forwards them to the UL-only TRP, which then applies them to UE transmissions. This distributed control approach allows for optimized power consumption at the UL-only TRP while distributing the control overhead across the network infrastructure rather than concentrating it at one point.
Data Source
AI summary
Solutions are provided for signaling and procedure for enabling uplink (UL) communications toward a base station operating as a UL-only transmission and reception point (TRP). One or more of these solutions may apply to contention-based random access (CBRA) procedures. One or more other solutions are provided for contention free random access (CFRA) procedures. Also provided are solutions for determining appropriate timing advanced (TA) signals for UEs communicating for a UL-only TRP. Also provided are transmission power control solutions for UL transmission via a physical random access (RA) channel (PRACH), a physical UL shared channel (PUSCH), and a PUCH, in addition to transmission power control solutions for sounding reference signal (SRS) transmissions.