Uplink Signal Transmission via PRACH Frequency Selection
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Solution Overview
Problem
The increasing number of user equipments (UEs) and the corresponding data and control information that base stations (BS) need to transmit, coupled with limited resources, necessitate an efficient method for transmitting and receiving uplink/downlink data and control information in wireless communication systems.
Innovation Solution
A method and apparatus for a user equipment (UE) and base station to efficiently transmit and receive uplink signals by configuring and using multiple frequencies, where the UE receives configuration information for uplink frequencies through a downlink operating frequency, transmits a physical random access channel (PRACH) on selected frequencies, and receives frequency information for uplink operation, allowing the UE to transmit uplink signals on the appropriate frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple frequencies are configured for uplink transmission, then data capacity and throughput are improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the uplink transmission process by dividing frequency selection into distinct phases: initial PRACH transmission on a first frequency, followed by data transmission on a second frequency determined through random access response. This segmentation allows the system to manage multiple frequencies without requiring simultaneous complex coordination across all frequencies, thereby improving throughput while controlling complexity.
Solution Approach 2:
The random access response message acts as an intermediary that carries frequency determination information from the base station to the user equipment. This intermediary mechanism simplifies the frequency management process by providing a clear, standardized method for the UE to determine which frequency to use for uplink data transmission, reducing the complexity of multi-frequency operations.
2Productivity
If multiple frequencies are used for uplink transmission, then resource utilization efficiency is improved, but the difficulty of detecting and measuring appropriate frequencies increases
Solution Approach 1:
The base station performs preliminary frequency assignment through the random access response message before the UE begins data transmission. The frequency determination information is provided in advance, allowing the UE to confidently select the appropriate frequency without needing to perform complex real-time frequency detection or measurement during the actual data transmission phase.
3Adaptability or versatility
If configuration information for multiple uplink frequencies is transmitted through downlink, then adaptability of the system is improved, but the amount of control information and overhead increases
Solution Approach 1:
The random access response message serves multiple functions: it provides timing advance information, grants uplink resources, and conveys frequency determination information. By making this existing control message multi-functional, the system achieves high frequency configuration adaptability without significantly increasing overall control overhead, as the frequency information is embedded within an already-necessary signaling message.
Data Source
AI summary
The present invention provides a method and user equipment for transmitting an uplink signal capable of enhancing coverage while conserving energy by separating a cell for receiving a downlink from a cell for transmitting an uplink.