5G Beam Access Sequence Mapping for Initial Uplink Transmission
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Solution Overview
Problem
In 5G New Radio systems, there is no initial transmission channel for signaling between network devices and terminal devices, making it difficult for network devices to learn about beam access information, which is essential for selecting proper beams for uplink data transmission.
Innovation Solution
A signal transmission method where terminal devices send specific sequences to network devices, establishing a correspondence between these sequences and the number of beams supported, allowing the network device to determine the number of beams and select appropriate beams for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal devices send access signals of multiple beams to network device, then network device can measure multiple beams, but network device cannot learn about access information of beams and thus cannot make measurement
Solution Approach 1:
The patent introduces a sequence signal as an intermediary carrier to transmit beam access information. The terminal device maps beam access information onto specific sequence signals, which then serve as the intermediary medium to convey this information to the network device during the random access process, solving the information loss problem without affecting beam measurement capability
Solution Approach 2:
The patent applies preliminary action by having the terminal device pre-process and map beam access information onto sequence signals before transmission. This preliminary encoding of beam information into the sequence structure enables the network device to extract and utilize beam access information in advance, allowing proper beam selection before uplink data transmission begins
2Loss of information
If no transmission channel exists for signaling between network device and terminal device in initial access, then system structure remains simple, but network device cannot obtain beam access information
Solution Approach 1:
The patent makes the existing physical random access channel multi-functional by enabling it to carry both traditional random access signaling and beam access information simultaneously. The sequence signals serve multiple purposes: establishing initial connection and conveying beam information, thus eliminating the need for a separate dedicated signaling channel while maintaining system simplicity
Solution Approach 2:
The patent changes the parameters of existing sequence signals to encode beam access information. By modifying sequence selection, sequence indexing, or sequence structure parameters, the system transmits additional beam information through the existing channel without adding new physical infrastructure, balancing information transmission needs with system complexity constraints
Data Source
AI summary
A signal transmission method includes: a first terminal device sends at least one first sequence to a network device, a one-to-one correspondence existing between the at least one first sequence and the number of beams supported by the first terminal device, so that the network device can accurately measure beams and the terminal device can transmit uplink data by selecting proper beams.