Terminal Device Beam Selection for 5G DRX PDCCH Reception
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Solution Overview
Problem
In 5G multi-beam systems, terminal devices face inefficiencies in selecting the correct downlink receiving beams during Active DRX, leading to wasted time and potential failure to decode PDCCH due to the need to measure multiple beams, especially when the number of beams is large.
Innovation Solution
The method involves a terminal device measuring signals from a reduced number of downlink receiving beams, determining a target beam based on signal strength or quality, and reporting it to the network, allowing for quicker beam selection and successful PDCCH decoding during the Active DRX state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device measures signals from all downlink receiving beams formed by beamforming, then the beam selection accuracy is improved, but the time required for beam selection increases significantly
Solution Approach 1:
The patent segments the complete set of downlink receiving beams into multiple subsets. The terminal device measures signals from a limited number of beams within each subset and selects the target beam from the best measurements across all subsets. This segmentation approach reduces the total number of beams that need to be measured while maintaining beam selection accuracy through multiple subset sampling.
Solution Approach 2:
The patent applies partial action by measuring signals from only a portion of all available downlink receiving beams rather than all beams. By selecting a target beam from the best measurements among multiple subsets with limited beams each, the system achieves acceptable beam selection accuracy with reduced measurement effort and time.
2Reliability
If the terminal device measures multiple downlink receiving beams to ensure correct beam selection, then the reliability of PDCCH reception is improved, but the activation state duration is reduced due to time consumption
Solution Approach 1:
The patent segments the beam measurement process into multiple subsets, allowing the terminal to efficiently select a target beam without measuring all beams. This reduces the time consumed during activation state while maintaining reliable PDCCH reception through the segmented measurement approach.
Solution Approach 2:
The patent performs preliminary beam measurements and selections during the activation state by processing multiple subsets. This preliminary action ensures the terminal identifies the correct target beam early in the activation state, leaving sufficient time for PDCCH reception before the activation state ends.
3Measurement precision
If the terminal device performs comprehensive beam measurements during Active DRX, then the downlink receiving beam accuracy is improved, but the power consumption increases due to extended measurement time
Solution Approach 1:
The patent segments the beam measurement task into multiple subsets with limited beams each. The terminal device measures signals from a reduced number of beams in each subset and selects the target beam from the best measurements. This segmentation reduces the total measurement time and associated power consumption while maintaining beam selection accuracy.
Solution Approach 2:
The patent applies partial action by measuring only a portion of all available downlink receiving beams through multiple subsets rather than all beams. This reduces the energy required for beam measurements while maintaining sufficient accuracy for reliable PDCCH reception.
Data Source
AI summary
Embodiments of the present application provides signal transmission method and apparatus for discontinuous reception, the signal transmission method includes: measuring, by a terminal device, a signal received by each of at least one downlink receiving beam and transmitted by a network device, where the number of the at least one downlink receiving beam is less than the number of downlink receiving beams formed by the terminal device and the network device by means of beamforming; determining, by the terminal device, a target downlink receiving beam from the at least one downlink receiving beam according to a result of the measurement; reporting, by the terminal device, the target downlink receiving beam to the network device, and receiving, by the terminal device, through the target downlink receiving beam, a physical downlink control channel PDCCH transmitted by the network device.