Dynamic Beam Indication via Downlink Control Information
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Solution Overview
Problem
In wireless communication, especially at high frequencies like millimeter waves, base stations face challenges in ensuring accurate beam alignment between base stations and user equipment (UE) devices, leading to potential communication failures due to high path loss and poor penetration through solid materials, necessitating improved mechanisms for signaling beam indication information.
Innovation Solution
The base station transmits beam indication information dynamically via downlink control information, indicating the appropriate beam for transmission or reception in specific time units, allowing UE devices to perform transmissions and receptions during optimal times by selecting from an available set of beam indices, which can include unknown states or Synchronization Signal Block (SSB) indices, and configuring beam patterns or virtual beam patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam forming is used to overcome high path loss and poor penetration at high frequencies, then communication reliability is improved, but the complexity of beam alignment and signaling increases
Solution Approach 1:
The base station performs beam scanning before actual communication to pre-determine the optimal beam direction for each UE. The beam indication information is prepared and signaled in advance, allowing UEs to align their receivers before data transmission begins, thus reducing real-time alignment complexity while maintaining reliability
Solution Approach 2:
The system incorporates feedback mechanisms where UEs report their beam residence information back to the base station. This feedback loop enables dynamic adjustment of beam directions and improves the accuracy of beam alignment, resolving the complexity-reliability tradeoff through iterative optimization
2Measurement precision
If dynamic beam indication information is transmitted via downlink control information, then beam alignment accuracy is improved, but the overhead and signaling complexity increases
Solution Approach 1:
The beam indication information is segmented and transmitted in multiple stages: first through semi-static configuration for general beam patterns, then through dynamic DCI for specific time units. This segmentation reduces the overhead of any single signaling message while maintaining precise beam alignment control
Solution Approach 2:
The downlink control information structure is designed to serve multiple purposes: it conveys beam indication information, scheduling decisions, and resource allocation in a single message. This multi-functionality reduces the total signaling overhead while maintaining beam alignment accuracy
3Productivity
If beam scanning procedure is implemented to enable UEs to recognize their beam residence, then communication efficiency is improved, but the time required for beam alignment increases
Solution Approach 1:
Beam scanning and UE beam residence determination are performed as preliminary actions before actual data communication begins. The base station pre-establishes the mapping between beam directions and UE locations, so that during active communication, UEs can immediately use the configured beam information without time-consuming real-time alignment
Solution Approach 2:
The system dynamically adjusts the beam scanning and indication mechanisms based on real-time communication needs. When a UE moves between beams, the system can quickly reconfigure without requiring a complete beam scan, thus maintaining communication efficiency while reducing alignment time through adaptive behavior
Data Source
AI summary
A base station may transmit beam indication information to one or more user equipment (UE) devices. For each of a plurality of time units (e.g., symbols) in a time interval (e.g., spanning one or more slots), the beam indication information indicates a corresponding beam that the base station will use to transmit or receive. A UE device may have knowledge of the beam in which it currently resides, e.g., by performing power measurements during a beam scan procedure. Thus, the beam indication information enables the UE to perform transmissions and/or receptions (e.g., configured transmissions and/or receptions) during the appropriate time unit(s). The beam indication information may be dynamically transmitted as part of downlink control information. This transmission may omni-directional, wide beam, or narrow beam. Various schemes of encoding the beam indication information are contemplated.