Uplink Control Information Transmission in Millimeter Wave Systems
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Solution Overview
Problem
In millimeter wave wireless communication systems, the existing methods for communicating uplink control information are inefficient due to high link budget requirements and unnecessary bandwidth usage in directional random access channels, which limits the system's ability to effectively transmit synchronization and control signals.
Innovation Solution
The proposed solution involves determining specific times for communicating uplink control information based on synchronization signals, allowing for concurrent transmission of physical uplink control channel information with random access channel information using unused bandwidth, and employing beamforming to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If directional random access channel signals occupy narrower bandwidth in millimeter wave systems, then beamforming capability is improved, but link budget becomes unnecessarily high
Solution Approach 1:
The patent introduces a new time dimension by defining specific time intervals for uplink control information transmission that are separate from random access channel occasions. This allows control information to be transmitted in dedicated time resources rather than competing for the same bandwidth resources as random access signals, effectively adding a temporal dimension to resource allocation that resolves the bandwidth-link budget contradiction.
Solution Approach 2:
The patent segments the uplink transmission resources by separating random access channel transmissions from uplink control information transmissions in the time domain. By determining specific time intervals for control information based on synchronization signals and separating them from random access occasions, the system divides the transmission resources into distinct segments, allowing each to operate with optimal parameters without interfering with the other.
2Productivity
If uplink control information is transmitted during random access channel occasions, then resource utilization is improved, but interference between control signals and random access signals increases
Solution Approach 1:
The patent implements periodic action by establishing specific time intervals for uplink control information transmission that are determined based on synchronization signals. These periodic time intervals are coordinated to avoid overlapping with random access channel occasions, creating a structured transmission schedule that maintains high resource utilization while eliminating signal interference through temporal separation.
3Adaptability or versatility
If beamforming settings are changed between time intervals for different devices, then directional communication capability is improved, but synchronization complexity increases
Solution Approach 1:
The patent applies preliminary action by having user equipment determine specific time intervals for uplink control information transmission in advance, based on synchronization signals received from the base station. This preliminary determination of transmission timing, performed before actual data transmission, allows the device to adapt to different beamforming settings without increasing real-time synchronization complexity, as the timing is pre-coordinated with the base station's beamforming schedule.
Data Source
AI summary
Various aspects of the disclosure relate to communicating random access information and uplink control information. In some aspects, a user equipment (UE) or other suitable apparatus transmits physical uplink control channel (PUCCH) information concurrently with random access channel (RACH) information transmitted by another UE or other apparatus. For example, the RACH access information and the PUCCH information may be frequency division multiplexed orthogonal tones. The disclosure relates in some aspects to using downlink-uplink (DL-UL) channel reciprocity to determine symbol and/or tone locations. For example, a base station or other suitable apparatus may initially sweep across different directions in different time slots to transmit signals during a synchronization sub-frame. A UE or other suitable apparatus can then find an appropriate RACH symbol from its best synchronization beam index and transmit PUCCH information in those symbols.