Random Access Preamble Indexing for Bearer Information Signaling
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Solution Overview
Problem
Existing wireless communication systems, such as 5G and NR, face challenges in efficiently conveying additional information during the random access process, leading to increased latency and power consumption, particularly in IoT devices, while maintaining backward compatibility.
Innovation Solution
Implementing multiple Msg1 transmissions with explicit or implicit grouping of preamble sequence indexes, allowing UEs to transmit additional information bits without modifying the sequence, and enabling the base station to correctly identify the UE through predefined mathematical relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple Msg1 transmissions with explicit or implicit grouping of preamble sequence indexes are implemented, then the ability to carry more information in the random access signal is enhanced, but the device complexity increases
Solution Approach 1:
The set of preamble sequence indexes is divided into multiple groups (first group, second group, etc.), where each group corresponds to different information bits. This segmentation allows the system to encode multiple information bits by selecting from different groups, thereby enhancing information carrying capacity without requiring a complete redesign of the random access mechanism.
Solution Approach 2:
Different preamble sequence indexes within specific groups are assigned different local qualities or properties (e.g., different time resources, frequency resources, or spatial resources). This allows the system to convey additional information through the specific choice of preamble within a group, enhancing information capacity while maintaining a structured approach that manages device complexity.
2Loss of time
If multiple Msg1 transmissions are implemented to convey additional information bits, then latency is reduced, but power consumption increases
Solution Approach 1:
The system performs preliminary grouping of preamble sequence indexes into multiple groups before the actual random access transmission. This preliminary organization allows UEs to efficiently select appropriate preambles that convey multiple information bits simultaneously, reducing the need for additional transmission rounds and thereby reducing latency while managing power consumption through optimized selection rather than repeated transmissions.
3Reliability
If multiple Msg1 transmissions with preamble sequence indexing constraints are implemented, then detection rates are improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The network node provides feedback to UEs regarding the successful detection of random access signals. This feedback mechanism allows the system to adjust and optimize the preamble selection and grouping strategy, improving detection rates by learning from previous detection outcomes and refining the constraint relationships between preamble indexes to enhance detectability while managing measurement complexity.
Data Source
AI summary
Methods, systems, and devices for generating random access signals with bearer information are described. An exemplary method for wireless communication includes transmitting, by a terminal to a network node, a first message comprising a first preamble sequence associated with a first index that is from a first half of a set of indexes, and transmitting a second message comprising a second preamble sequence associated with a second index that is from a second half of the set of indexes, wherein the first index and the second index satisfy a constraint relationship.