Uplink Data Scheduling via Multi-Beam Carrier Sensing
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Solution Overview
Problem
In 5G systems, transmission delays occur for uplink data on unlicensed frequency bands due to the need for terminal devices to perform carrier sensing on a single beam, leading to potential loss of scheduling opportunities and delayed data transmission when channels are busy.
Innovation Solution
Configuring multiple candidate beams for terminal devices to perform sequential carrier sensing, allowing them to select an idle beam for data transmission, thereby reducing transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal device performs carrier sensing on a single beam direction, then the device complexity is reduced, but the transmission delay of the uplink channel increases
Solution Approach 1:
The patent segments the carrier sensing process into two distinct phases: first, beam-level sensing on a single beam to quickly identify potential idle channels; second, channel-level sensing across multiple frequency channels. This segmentation allows the system to reduce overall sensing complexity while minimizing transmission delay by avoiding the need to sense all channels simultaneously
Solution Approach 2:
The patent applies preliminary action by performing beam-level carrier sensing before channel-level sensing. The beam-level sensing serves as a preliminary filter to identify promising beam directions, which then guides the subsequent channel-level sensing process. This preliminary action reduces the total sensing time and transmission delay by eliminating unnecessary sensing in occupied beam directions
2Loss of time
If a terminal device performs carrier sensing on multiple beams, then the transmission delay is reduced, but the device complexity increases
Solution Approach 1:
The patent divides the multi-beam carrier sensing into hierarchical levels: beam-level sensing that evaluates multiple beam directions, followed by channel-level sensing on selected channels. This segmentation reduces device complexity by not requiring simultaneous sensing on all beams and channels, while still achieving reduced transmission delay through parallel processing of beam evaluations
Solution Approach 2:
The patent implements partial action by performing carrier sensing on a subset of channels rather than all available channels. After beam-level sensing identifies idle beam directions, the system performs channel-level sensing only on a selected portion of channels within those beams. This partial sensing approach reduces device complexity while maintaining reduced transmission delay by focusing resources on the most promising channels
Data Source
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AI summary
Disclosed are an uplink data scheduling method and device, the method comprising: a terminal device receiving a first signalling sent by a network device, wherein the first signalling comprises beam information of M beams, and M is a positive integer; the terminal device carrying out carrier sensing on the M beams in sequence according to the first signalling; and the terminal device selecting, according to the sensing result, one beam of the M beams to transmit an uplink channel to the network device. Therefore, the network device configures a plurality of candidate beams for the terminal device for transmission of the uplink channel, so that the terminal device carries out carrier sensing on the plurality of candidate beams in sequence based on a certain rule, and selects, based on the sensing result, a suitable beam to transmit the uplink channel, thereby greatly reducing transmission time delay of the uplink channel on an unlicensed frequency band.