Reference Signal Allocation for Beam Indication in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, beamforming transmitters frequently change their transmit beams based on channel conditions, necessitating timely and accurate indication of the radio resource for efficient signal reception by receivers, which existing methods fail to provide effectively.
Innovation Solution
The method involves allocating multiple reference signals (RSs) for beam indication, selecting one for the receiver, and transmitting information about the selected RS, including a reference indication that indicates the radio resource, allowing the receiver to determine the appropriate RS for signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming transmitter changes beams based on channel conditions, then transmission efficiency is improved, but indication accuracy deteriorates due to timing delays
Solution Approach 1:
The transmitter pre-configures multiple reference signals (RSs) with different spatial filters (beams) before actual data transmission. The receiver measures these pre-configured RSs and reports back, allowing the transmitter to select the appropriate beam in advance. This preliminary configuration of multiple beams resolves the timing delay issue by having ready-to-use beam options available before transmission begins.
Solution Approach 2:
The system dynamically selects from multiple pre-configured reference signals based on current channel conditions. The transmitter can switch between different RSs (each with different spatial filters) adaptively, allowing the beam indication to remain accurate even as channel conditions change. This dynamic selection capability maintains indication accuracy while preserving transmission efficiency.
2Adaptability or versatility
If multiple reference signals are allocated for beam indication, then beam selection flexibility is improved, but system complexity increases
Solution Approach 1:
The system divides the beamforming process into separate measurable components: multiple reference signals are allocated, each with distinct spatial filters. The receiver measures each RS independently and reports back, allowing the transmitter to select from segmented beam options. This segmentation provides flexibility while managing complexity through modular measurement and reporting.
Solution Approach 2:
Reference signals serve as intermediaries between the transmitter's beamforming intent and the receiver's beam selection. Instead of directly indicating complex beam parameters, the system uses RSs as intermediary measurements that the receiver can evaluate and report. This intermediary approach simplifies the indication process while maintaining flexibility in beam selection.
Data Source
AI summary
Methods and apparatus for indicating a radio resource to a receiver in a wireless communication system, the method including allocating a plurality of reference signals (RSs) for beam indication, selecting one of the plurality of RSs for the receiver, and transmitting information about the selected RS to the receiver, wherein the information includes a reference indication (RI) that indicates the radio resource of the selected RS.