DMRS Bundling for Random Access Message Reception
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Solution Overview
Problem
Current wireless communication systems face challenges in establishing efficient radio resource control (RRC) connections due to poor demodulation reference signal (DMRS) bundling, particularly in non-terrestrial networks, leading to increased latency and resource consumption during random access procedures.
Innovation Solution
Implementing DMRS bundling support in user equipment (UE) and network nodes before establishing an RRC connection, allowing for improved channel estimation and demodulation by bundling DMRS symbols across multiple slots, thereby enhancing the reception of random access messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS bundling is implemented across multiple slots, then channel estimation accuracy and message reception reliability are improved, but the time required for random access procedure increases
Solution Approach 1:
The patent applies preliminary action by configuring DMRS bundling parameters and establishing the bundling mechanism before the random access procedure begins. The network node and UE pre-configure the bundling duration, timing information, and resource allocation, allowing the actual random access message transmission to benefit from improved channel estimation without adding significant time overhead during the critical access phase.
2Measurement precision
If DMRS symbols are bundled across multiple slots, then demodulation performance is improved, but resource consumption increases
Solution Approach 1:
The patent applies local quality by selectively applying DMRS bundling only to specific time resources and message transmissions where it is most beneficial, rather than bundling all DMRS symbols uniformly. The network node determines the appropriate bundling duration and applies it locally to the critical random access message transmission window, optimizing channel estimation accuracy for those specific resources while minimizing overall resource consumption.
3Productivity
If DMRS bundling support is communicated before RRC connection establishment, then connection establishment speed is improved, but signaling overhead increases
Solution Approach 1:
The patent applies universality by incorporating DMRS bundling capability indication within existing multi-functional signaling messages that are already exchanged during the random access procedure, such as system information blocks or random access response messages. This allows the bundling configuration to be conveyed as part of the standard connection establishment signaling, avoiding additional dedicated signaling overhead while still enabling fast configuration of the bundling mechanism.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may communicate, before establishing a radio resource control (RRC) connection, support for demodulation reference signal (DMRS) bundling of a message of a random access (RA) procedure. The UE may transmit the message of the RA procedure based at least in part on the support for DMRS bundling. Numerous other aspects are described.