Beam Adjustment Using DMRS Sequences for URLLC Latency
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Solution Overview
Problem
Current beam adjustment procedures in 5G wireless communication systems, particularly for URLLC UEs, are not sufficiently robust and reliable, leading to increased latency and overhead, which affects the stringent latency and reliability requirements for ultra-reliable low-latency communication (URLLC) services.
Innovation Solution
A beam adjustment procedure using a beam-misalignment indication mechanism, where the UE detects misalignment through measurements and transmits a specific sequence, such as DMRS, to inform the network node of the new preferred beam, allowing for immediate adjustment and monitoring within the configured-grant configuration, reducing the need for frequent PUCCH resources and minimizing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam adjustment procedures are used, then beam alignment can be maintained, but latency increases and reliability decreases for URLLC services
Solution Approach 1:
The system pre-configures multiple DMRS sequences at the UE before beam misalignment occurs. When misalignment is detected, the UE can immediately transmit the appropriate pre-configured sequence without waiting for new configuration, thereby reducing latency while maintaining reliable beam adjustment
Solution Approach 2:
The UE performs beam measurements and detects misalignment, then provides feedback to the network node by transmitting a specific DMRS sequence that indicates the misalignment and suggests a new preferred beam. This feedback mechanism enables rapid beam adjustment while ensuring reliability through confirmed beam selection
2Reliability
If frequent PUCCH resources are allocated for beam adjustment, then beam alignment reliability improves, but system overhead increases
Solution Approach 1:
The DMRS sequence serves multiple functions: it acts as both a reference signal for channel estimation and as a beam misalignment indication signal. This multi-functionality eliminates the need for separate PUCCH resources for beam adjustment, reducing overhead while maintaining reliability
Solution Approach 2:
The system uses existing DMRS resources configured for normal data transmission to also perform beam adjustment indications. The UE leverages the already-allocated uplink resources to convey beam misalignment information, thereby avoiding additional overhead while ensuring reliable beam management
Data Source
AI summary
A method may include receiving, from a network node, association and configuration information for a plurality of sequences, where each sequence may be associated to at least one network-node beam or beam-pair link. The method may also include performing beam measurements of beams from the network node to obtain beam measurement information. The method may further include detecting beam misalignment of the beam based on the beam measurement information. In addition, the method may include transmitting a sequence among the plurality of sequences to the network node to inform the network node of the beam misalignment, and to trigger the network node to start a beam adjustment procedure and a monitoring procedure for a configured-grant configuration. Further, the method may include, after transmitting the sequence, considering the indicated preferred beam as a new serving beam, and switching to the configured-grant configuration associated with this new serving beam.