Phase Compensation for Coordinated Downlink Reception
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Solution Overview
Problem
In 6G communication systems, the short packet arrival times of uplink extended reality (XR) traffic introduce additional latency due to the limitations of current techniques in allocating uplink grants for hybrid automatic repeat and request (HARQ) processes.
Innovation Solution
A method and device for a user equipment (UE) in a wireless communication system, which involves receiving channel state information reference signals (CSI-RS) from multiple transmission/reception points (TRPs), estimating phase values based on these signals, and transmitting sounding reference signals (SRS) with phase shifts to enable effective downlink data reception during coordinated transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordinated transmission is used to improve downlink data reception, then signal coverage and reception gain are improved, but phase alignment between multiple TRPs becomes difficult to maintain, degrading transmission reliability
Solution Approach 1:
The patent applies preliminary action by performing phase alignment preparation before actual data transmission. The UE estimates phase values based on CSI-RS signals received from multiple TRPs in advance, and the gNB applies phase compensation to SRS signals before the coordinated transmission occurs. This preliminary phase alignment preparation enables reliable coordinated transmission without complex real-time adjustments during data reception.
2Reliability
If phase compensation is applied to align signals from multiple TRPs, then transmission reliability is improved, but additional signal processing steps are required, increasing system complexity
Solution Approach 1:
The patent applies self-service by having the UE autonomously estimate phase values based on CSI-RS signals and feed back this information to the gNB. The gNB then automatically applies phase compensation to SRS signals without requiring manual intervention or complex real-time processing. The system uses the UE's own received signals (CSI-RS) to generate the compensation parameters, making the process self-contained and efficient.
3Productivity
If multiple TRPs transmit simultaneously for coordinated transmission, then downlink data reception gain is maximized, but phase differences between TRPs cause signal interference, reducing reception quality
Solution Approach 1:
The patent converts the harmful phase differences between TRPs into beneficial alignment by using these phase differences as the basis for compensation. The UE measures the actual phase differences in received CSI-RS signals from different TRPs, and the gNB uses these same phase difference measurements to apply compensating phase shifts to SRS signals. This transforms the harmful phase variations into the precise information needed for optimal signal alignment, enabling the system to achieve coordinated transmission gain while eliminating interference.
Data Source
AI summary
This disclosure relates to 5th generation (5G) or 6th generation (6G) communication systems to support higher data rates after 4th generation (4G) communication systems such as long-term evolution (LTE). A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from each of at least one first transmission/reception point (TRP), a first channel state information reference signal (CSI-RS), receiving, from a second TRP, a second CSI-RS, estimating at least one first phase value of each of the first CSI-RS received from each of the at least one first TRP, based on the first CSI-RS received from each of the at least one first TRP, estimating a second phase value based on the second CSI-RS, and transmitting, to each of the at least one first TRP, a first sounding reference signal (SRS) and a second SRS on different adjacent symbols, respectively, based on a phase shift using the at least one first phase value and the second phase value.