Uplink Sub-band Precoding for Wireless Transmission Gain
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Solution Overview
Problem
Current wireless communication systems, such as LTE and NR, do not support sub-band precoding for uplink signals, limiting the transmission gain and performance of uplink signal transmission.
Innovation Solution
A communication method and apparatus that allow a terminal device to determine and transmit uplink signals on specific sub-bands within an uplink resource, using indication information from a network device to improve transmission gain, by determining frequency-domain starting positions and sub-band widths to accurately allocate sub-bands for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadband precoding is used for uplink PUSCH transmission, then the system is simple to implement, but the transmission gain is limited and frequency-selective precoding cannot be achieved
Solution Approach 1:
The patent divides the uplink resource into multiple sub-bands in the frequency domain, allowing independent precoding for each sub-band. This segmentation enables frequency-selective precoding while maintaining manageable complexity through structured sub-band division and corresponding indication mechanisms.
Solution Approach 2:
The patent introduces sub-band dimensionality to the precoding mechanism, transitioning from broadband (single-dimensional) precoding to sub-band (multi-dimensional) precoding. This adds frequency-selective capability while organizing the complexity through systematic sub-band allocation and indication fields in DCI.
2Reliability
If sub-band precoding is introduced to improve transmission gain, then frequency-selective precoding capability is achieved, but the complexity of indicating sub-band precoding and determining precoding methods increases
Solution Approach 1:
The patent pre-divides the uplink resource into multiple sub-bands before precoding operation. The network device then selects and indicates specific sub-bands for precoding based on channel conditions, avoiding the need for complex real-time precoding determination while enabling frequency-selective optimization.
Solution Approach 2:
The patent uses parameter changes in the indication information (such as sub-band selection indicators, precoding matrix indicators, and layer indicators) to control the precoding process. This transforms the complex precoding determination into parameter-based configuration, simplifying the operational process while maintaining transmission gain.
3Reliability
If the same analog beamforming and precoding matrix are used on all scheduled frequency-domain resources, then the implementation is simple, but the transmission performance cannot be optimized for different frequency sub-bands
Solution Approach 1:
The patent applies different precoding configurations to different sub-bands based on their local channel characteristics. Each sub-band can have its own precoding matrix and parameters selected according to local channel conditions, optimizing transmission performance while organizing complexity through standardized sub-band-based configuration.
Data Source
AI summary
Embodiments of the present invention relate to the technical field of wireless communications, and provide a communication method and apparatus, for improving a transmission gain of an uplink signal. The method comprises: a terminal device determines, in an uplink resource, at least one first sub-band for transmitting an uplink signal; the terminal device transmits the uplink signal according to the received indication information, sent by a network device, of the uplink signal and the at least one determined first sub-band, wherein the indication information is used for indicating a transmission parameter and/or a transmission antenna of the uplink signal. According to the method, a terminal can determine, on the uplink resource, the first sub-band for transmitting the uplink signal, and the terminal and the network device transmit, according to the indication information of the uplink signal, the uplink signal on the determined first sub-band, so that the transmission gain of the uplink signal is improved.