Multi-Rx Chain DL Reception Beyond CP Duration
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Solution Overview
Problem
5G New Radio systems face challenges in coordinated downlink data reception from multiple transmission and reception points (TRPs) when the receive timing difference (RTD) exceeds the cyclic prefix (CP) duration, leading to inter-beam interference and increased error rates due to the limitations of single receive chain devices.
Innovation Solution
Implementing a network node that configures scheduling restrictions over symbol periods to prevent interference by determining the maximum RTD value and imposing restrictions based on interference thresholds, allowing simultaneous data transmission from multiple TRPs to user equipment (UE) with multiple receive chains, even when the RTD exceeds the CP duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous data transmission from multiple TRPs is implemented, then downlink capacity and spectral efficiency are improved, but inter-beam interference occurs when RTD exceeds CP duration
Solution Approach 1:
The network node performs preliminary actions by determining the maximum RTD value before scheduling data transmissions. The node calculates the scheduling offset based on the determined maximum RTD and applies this offset to schedule reference signals and data transmissions, preventing inter-beam interference before it occurs. This preliminary timing adjustment enables simultaneous multi-TRP transmission while maintaining signal integrity.
2Object-affected harmful factors
If scheduling restrictions are imposed to avoid IBI, then interference is reduced, but transmission efficiency decreases
Solution Approach 1:
The system changes the timing parameter by introducing a scheduling offset that is dynamically adjusted based on the determined maximum RTD value. Instead of using fixed scheduling, the node modifies the timing parameters of reference signals and data transmissions according to the actual RTD conditions, allowing efficient transmission while preventing interference through parameter adaptation rather than restrictive scheduling.
3Reliability
If multi-Rx chain reception is implemented, then coverage and capacity are improved, but device complexity increases
Solution Approach 1:
The network node implements a universal scheduling mechanism that works across different RTD conditions and multi-TRP configurations. By determining the maximum RTD value and using it to calculate a scheduling offset, the system creates a universal timing adjustment approach that handles various scenarios (different TRP combinations, RTD values, and reception chains) through a single unified method, reducing the complexity burden on individual receive chains.
Data Source
AI summary
Disclosed herein are system, method, and computer program product embodiments for implementing multiple receive (multi-Rx) chain downlink (DL) reception when the receive timing difference (RTD) at a user equipment (UE) from multiple transmission and reception points (TRPs) is greater than the cyclic prefix (CP). An embodiment operates by configuring a first base station (BS) to transmit a first data and a second BS to transmit a second data simultaneously to a user equipment (UE) during a first symbol period, where the first data from the first BS is received by the UE using a first receive beam and the second data from the second BS is received by the UE using a second receive beam. The embodiment also configures the first BS to transmit a reference signal (RS) to the UE during a second symbol period that is subsequent to the first symbol period. The embodiment then determines a scheduling restriction applied to the second BS during a plurality of symbol periods, wherein the plurality of symbol periods include the second symbol period. Finally, the embodiment provides the scheduling restriction the second BS.