Uplink Rank Adaptation for MIMO Power and Latency Control
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Solution Overview
Problem
Existing methods for reducing transmission rank in wireless communication systems involve high latency and resource consumption, particularly in power-saving modes, and do not efficiently adapt to changing operating conditions.
Innovation Solution
User equipment (UE) dynamically adjusts the number of transmission layers based on factors like overheating status, traffic throughput, and latency by transmitting indications to the base station (BS) using single-port or multi-port UL reference signal resources, allowing for implicit or explicit signaling without radio resource control (RRC) reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC reconfiguration is used to reduce transmission rank, then transmission rank adaptation is achieved, but latency and signaling overhead increase
Solution Approach 1:
The patent extracts the transmission rank indication from the RRC reconfiguration procedure and places it in the MAC-CE signaling layer. This allows the rank adaptation to be achieved through MAC-CE messages rather than full RRC reconfiguration, reducing latency and signaling overhead while maintaining adaptability
Solution Approach 2:
The patent segments the transmission rank indication into a separate MAC-CE message structure, allowing independent control of rank adaptation without triggering full RRC reconfiguration. This segmentation enables faster adaptation by isolating the rank parameter from other RRC configuration elements
2Adaptability or versatility
If RRC reconfiguration is used to reduce transmission rank, then transmission rank adaptation is achieved, but signaling overhead and resource consumption increase
Solution Approach 1:
The patent extracts the transmission rank indication from RRC reconfiguration and implements it through MAC-CE signaling, significantly reducing signaling overhead. The MAC-CE message contains only the necessary rank indication bits rather than full RRC configuration parameters
Solution Approach 2:
The patent implements dynamic transmission rank adaptation through MAC-CE messages that can be transmitted frequently and updated in real-time based on channel conditions, power status, and traffic requirements, without the rigidity of RRC reconfiguration cycles
3Adaptability or versatility
If multi-port UL reference signal resources are used, then transmission flexibility is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent applies partial action by configuring only the necessary number of UL reference signal ports based on current transmission requirements. The system dynamically adjusts the number of active ports rather than maintaining all possible ports, reducing complexity while preserving flexibility when needed
Solution Approach 2:
The patent implements dynamic port configuration where the number and activation state of UL reference signal ports are adjusted in real-time based on transmission rank, power status, and channel conditions, optimizing the balance between flexibility and complexity
4Use of energy by moving object
If transmission rank is reduced for power saving, then energy efficiency is improved, but throughput may be compromised
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors power status, channel conditions, and traffic requirements, then dynamically adjusts transmission rank through MAC-CE indications. The system can increase rank when power is available and channel conditions warrant higher throughput, and reduce rank when power saving is critical
Solution Approach 2:
The patent enables dynamic transmission rank adjustment that responds to real-time power status and traffic conditions. The system can rapidly switch between different rank configurations without RRC reconfiguration, optimizing the trade-off between power consumption and throughput based on current operating conditions
Data Source
AI summary
Methods related to wireless communication systems and uplink (UL) rank adaptation are provided. A user equipment (UE) receives, from a base station (BS), a configuration indicating a resource associated with a plurality of UL reference signal ports. The UE determines, based on at least one of an overheating status, a throughput, or a latency, a quantity of transmission layers for a transmission. The UE transmits, to the BS, an indication of at least one of (1) one or more UL reference signal ports of the plurality of UL reference signal resources associated with the UL reference signal resource based on the quantity of transmission layers, or (2) a number of UL reference signal ports associated with the multi-port UL reference signal resource based on the quantity of transmission layers.