Dynamic Joint DMRS and PUSCH Indication for Wireless Uplink Adaptation
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Solution Overview
Problem
Current wireless communication systems face limitations in dynamically adjusting demodulation reference signal (DMRS) configurations and physical uplink channel transmission modes, leading to inefficiencies in channel estimation and resource allocation, particularly due to the use of fixed configurations that do not adapt well to changing network conditions and user equipment states.
Innovation Solution
Implementing a method for a base station and user equipment to transmit and receive dynamic joint indications of DMRS configurations and PUSCH transmission modes, allowing for flexible and coordinated adjustments based on current network conditions and user equipment states, using medium access control (MAC) control elements and downlink control information (DCI) for dynamic signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed DMRS configurations are used, then device complexity is reduced, but adaptability to changing network conditions deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from fixed DMRS configurations to dynamic configurations that can be adjusted in real-time based on network conditions. The base station receives channel state information from the UE and dynamically determines DMRS configuration parameters such as time-domain density, frequency-domain density, and maximum number of DMRS symbols per location, allowing the system to adapt to changing conditions without requiring complex manual reconfiguration.
Solution Approach 2:
The patent changes key parameters of the DMRS configuration including time-domain density (number of DMRS symbols per slot), frequency-domain density (number of DMRS locations per allocation), and maximum number of DMRS symbols per location based on channel conditions. These parameter changes enable the system to optimize channel estimation performance while adapting to varying network conditions dynamically.
2Measurement precision
If excessive DMRS reference signals are used, then channel estimation precision is improved, but loss of energy and computing resources increases
Solution Approach 1:
The patent dynamically adjusts DMRS configuration parameters including time-domain density, frequency-domain density, and maximum number of DMRS symbols per location based on channel state information. This allows the system to use more DMRS signals when channel conditions require high estimation precision and fewer signals when conditions are favorable, thereby optimizing the trade-off between measurement precision and energy consumption.
Solution Approach 2:
The patent implements partial action by using a variable number of DMRS signals rather than consistently using maximum or fixed numbers. The base station determines the appropriate level of DMRS signaling (from minimal to excessive) based on actual channel conditions, avoiding both the waste of energy from excessive signals and the insufficient estimation from minimal signals in challenging conditions.
3Productivity
If dynamic joint indication of DMRS configuration and PUSCH transmission mode is implemented, then adaptability and link efficiency are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent merges the DMRS configuration indication and PUSCH transmission mode indication into a single dynamic joint indication field in the Downlink Control Information. This combining approach allows the base station to simultaneously control both the DMRS configuration parameters and the PUSCH transmission mode using one signaling mechanism, reducing the overall complexity compared to separate indications while maintaining high adaptability and link efficiency.
Solution Approach 2:
The dynamic joint indication field serves multiple functions by simultaneously indicating both DMRS configuration parameters and PUSCH transmission mode. This multi-functional approach allows a single signaling element to control multiple aspects of uplink transmission, reducing the number of separate control signals needed and simplifying the overall device complexity while maintaining high productivity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may determine a demodulation reference signal (DMRS) configuration and a physical uplink shared channel (PUSCH) transmission mode for a user equipment to use for one or more uplink transmissions. The base station may transmit a dynamic joint indication of the DMRS configuration and the PUSCH transmission mode. Numerous other aspects are provided.