Time-Domain Cover-Coded SRS for Flexible Antenna Switching
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Solution Overview
Problem
Existing wireless communication systems face limitations in scheduling flexibility due to constraints on reference signal resources, particularly in antenna switching processes for UEs with multiple antennas, which affect channel estimation and downlink beamforming.
Innovation Solution
Implementing time domain cover code-based sounding reference signal resources with configurations for antenna switching, including indications of time division cover coding and frequency hopping, to enhance transmission and reception of reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna switching process is implemented for UEs with multiple antennas, then channel estimation and downlink beamforming are improved, but scheduling flexibility is limited due to constraints on reference signal resources
Solution Approach 1:
The reference signal resource is segmented into multiple repetitions transmitted at different time instances. Each repetition can be independently scheduled and configured, allowing the system to maintain channel estimation functionality while gaining scheduling flexibility through distributed resource allocation across multiple time slots
Solution Approach 2:
The patent introduces dynamic frequency hopping between repetitions and configurable time domain cover codes that can be adjusted based on channel conditions and scheduling requirements. This dynamic configuration allows the system to adapt reference signal transmissions to varying channel states and scheduling constraints, resolving the contradiction between fixed resource constraints and flexible scheduling needs
2Device complexity
If reference signal resources are constrained, then resource allocation is simplified, but scheduling flexibility and communication efficiency are reduced
Solution Approach 1:
The reference signal resource configuration is designed to serve multiple functions simultaneously: channel estimation, downlink beamforming, and flexible scheduling adaptation. By making the resource configuration universal and configurable through parameters like frequency hopping and time domain cover codes, the system achieves improved communication efficiency without significantly increasing resource allocation complexity
Solution Approach 2:
The system utilizes configurable parameters such as frequency hopping patterns, time domain cover code lengths, and repetition intervals to optimize reference signal transmissions. These parameter changes allow flexible adaptation to different communication scenarios and channel conditions, improving productivity while maintaining manageable resource allocation through standardized configuration mechanisms
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may use cover coding for sounding reference signal (SRS) resources for performing antenna switching. The UE may receive a configuration for a reference signal resource set for transmitting a reference signal for antenna switching, the configuration including an indication of a type of time division cover coding for repetitions of the reference signal and an indication of a type of frequency hopping. The UE may determine a reference signal resource for transmission of the reference signal based on the configuration and the type of frequency hopping. The UE may then transmit a set of repetitions of the reference signal over the determined reference signal resource according to the type of time division cover coding.