Multi-TRP Communication Signaling Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multi-TRP communication, particularly in indicating transmission configuration indications (TCI) and demodulation reference signal (DMRS) ports for multiple transmission/reception points (TRPs), leading to increased signaling overhead and complexity.
Innovation Solution
The method involves determining and indicating TCI states and DMRS ports for multiple TRPs within a single Downlink Control Information (DCI) message, using a combination of existing fields to minimize overhead by reusing existing DCI configurations and indicating TCI state differences with minimal additional bits, allowing for efficient communication between network devices and terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states and DMRS ports are indicated for multi-TRP communication, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the indication of multiple TCI states and DMRS ports into a single DCI message by reusing existing DCI fields. Specifically, the patent uses the TCI field and DMRS field in the DCI to indicate multiple TCI states and DMRS ports through bit manipulation and field reuse, thereby reducing the number of separate signaling messages needed while maintaining reliable multi-TRP communication.
Solution Approach 2:
The patent makes existing DCI fields universal by enabling them to serve multiple functions. The TCI field and DMRS field are designed to simultaneously indicate multiple TCI states and DMRS ports for different TRPs, allowing a single field to perform what would traditionally require multiple separate fields, thus reducing signaling overhead while maintaining communication reliability.
2Reliability
If multiple TCI states and DMRS ports are indicated for multi-TRP communication, then communication reliability is improved, but DCI message complexity increases
Solution Approach 1:
The patent combines multiple indication functions into existing DCI fields rather than creating new separate fields. By reusing the TCI field and DMRS field to indicate multiple states and ports through bit manipulation, the patent reduces the structural complexity of the DCI message while maintaining the ability to convey comprehensive multi-TRP configuration information.
Solution Approach 2:
The patent changes the parameter representation within existing DCI fields to encode multiple TCI states and DMRS ports. By manipulating bit patterns and field values in creative ways, the patent enables a single field to represent multiple configurations, thereby reducing the overall complexity of the DCI message structure while maintaining reliable communication.
Data Source
AI summary
Embodiments of the present disclosure provide methods, devices and computer readable media for multi-TRP transmission. According to a method for communication, a terminal device receives downlink control information (DCI) from at least one of a plurality of network devices in communication with the terminal device, each of the plurality of network devices having a different demodulation reference signal (DMRS) group comprising a plurality of DMRS ports for transmitting DMRSs. The terminal device determines, from the DCI, respective transmission configuration indication (TCI) states for DMRS groups of the plurality of network devices and DMRS ports for receiving DMRSs transmitted by the plurality of network devices. The terminal device receives the DMRSs from the plurality of network devices on the DMRS ports based on the TCI states. The embodiments of the present disclosure provide solution of multi-TRP communication with reduced overhead.