SRS Hopping Configuration for Inter-Cell Interference Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing inter-cell interference and efficient channel estimation for uplink and downlink transmissions, particularly in 5G New Radio (NR) systems with time division duplexing, where frequency division duplexing is infeasible.
Innovation Solution
The design of sounding reference signals (SRS) involves configuring a group parameter and cyclic shift parameters that hop at different levels of time units, using time-domain orthogonal cover codes (TD-OCC) and multiplexing types for multiple SRS ports, to reduce inter-cell interference and enhance channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sounding reference signals use fixed parameters for channel estimation, then channel estimation can be performed efficiently, but inter-cell interference increases
Solution Approach 1:
The patent applies dynamics by making the SRS parameters time-varying through hopping mechanisms. The group parameter hops at one time unit level while the cyclic shift parameter hops at another time unit level, creating dynamic parameter changes that reduce inter-cell interference while maintaining channel estimation accuracy through controlled randomness.
Solution Approach 2:
The patent changes physical parameters of the SRS by introducing hopping for group parameters and cyclic shift parameters. These parameter changes occur at different time unit levels, transforming the SRS characteristics over time to mitigate interference while preserving measurement precision.
2Adaptability or versatility
If multiple SRS ports are multiplexed using traditional methods, then resource utilization is limited, but system flexibility and adaptability for diverse use-cases decrease
Solution Approach 1:
The patent segments the SRS configuration into multiple independent parameters (group parameter, cyclic shift parameter, TD-OCC) that can be independently controlled and hopped at different time unit levels. This segmentation enables flexible adaptation to diverse use-cases while managing complexity through modular parameter design.
Solution Approach 2:
The patent creates a universal SRS framework that can adapt to multiple access requirements and use-cases through configurable hopping patterns and multiplexing types. The same basic mechanism serves different scenarios by adjusting parameter hopping behaviors and TD-OCC applications.
Data Source
AI summary
Methods, systems, and devices for designing and configuring reference signals in wireless communication systems are disclosed. An example method for wireless communication includes transmitting, by a wireless device to a network node, a sounding reference signal (SRS), where the SRS is determined by a first parameter and a cyclic shift parameter, and a value of the first parameter hops at a level of a first type of time unit and a value of the cyclic shift parameter hops at a level of a second type of time unit. Another example method for wireless communication includes receiving, by a wireless device from a network node, a configuration for an SRS resource, and transmitting an SRS in the SRS resource, where the configuration includes information associated with one or more time-domain orthogonal cover codes (TD-OCC) or a multiplexing type for multiple SRS ports in the SRS resource.