Random Access Preamble Configuration via Index Mapping
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring terminal devices with the necessary information to generate random access preamble sequences effectively, particularly in maximizing cell coverage distance through optimal zero correlation zone values and set types.
Innovation Solution
The method involves a network device sending specific parameters, such as zero correlation zone values and set types, to a terminal device to generate random access preamble sequences, ensuring the largest possible cell coverage distance by selecting the appropriate values for each reuse factor, and using simplified signaling to indicate the required set types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the network device sends detailed configuration information for random access preamble sequence generation, then the terminal device can generate sequences with optimal cell coverage distance, but the signaling overhead and system complexity increase
Solution Approach 1:
The patent changes the parameter representation from detailed configuration values to index values that reference pre-defined parameter sets. The network device sends index information (first information and second information) that points to specific zero correlation zone configurations and set types, rather than transmitting the actual parameter values directly. This reduces signaling overhead while maintaining the ability to configure optimal parameters for cell coverage distance.
Solution Approach 2:
The patent establishes pre-defined parameter sets and correspondence relationships between index values and configuration parameters before the actual random access procedure. The network device and terminal device agree on the mapping between index combinations and specific zero correlation zone values, set types, and other parameters in advance, allowing efficient configuration during runtime without complex real-time calculations.
2Length of stationary object
If the network device configures specific zero correlation zone values for different reuse factors, then the random access preamble sequences achieve maximum cell coverage, but the information transmission overhead increases
Solution Approach 1:
The patent transforms the transmission of actual zero correlation zone values into transmission of compact index values. Instead of sending multiple bytes representing the actual Ncs values (which could be large numbers), the system sends small index values that reference pre-agreed parameter tables. This dramatically reduces the signaling overhead while preserving the full range of configurable zero correlation zone values for different reuse factors.
Solution Approach 2:
The patent uses index values as compact representations (copies) of the actual configuration parameters. The terminal device uses these index copies to retrieve the full parameter values from locally stored correspondence tables, avoiding the need to transmit the complete parameter data over the air interface.
3Length of stationary object
If the terminal device uses restricted set types for random access preamble generation, then the cell coverage distance is maximized for each reuse factor, but the flexibility in sequence generation is reduced
Solution Approach 1:
The patent makes the set type dynamic and configurable through the received index information. The terminal device determines the appropriate set type (unrestricted set, restricted set type A, or restricted set type B) based on the second information received from the network device. This allows the system to adaptively select the most suitable set type for each specific scenario while maintaining the flexibility to switch between different set types as needed.
Solution Approach 2:
The patent configures the set type parameter dynamically based on the received index values and reuse factor. Different combinations of first information and second information map to different set types, allowing the network to optimize the set type selection for each reuse factor configuration to maximize cell coverage while maintaining appropriate flexibility through the indexed parameter selection.
Data Source
AI summary
This application provides an information transmission method and apparatus. The method includes: sending, by a network device, first information, where the first information indicates a first parameter, and the first parameter is at least one of 237, 216, 195, 173, 152, 137, 132, 127, 121, 117, 112, 108, 103, 99, 94, 91, 89, 86, 84, 81, 77, 74, 72, 69, 68, 67, 66, 64, 63, 62, 61, 59, 58, and 57, or at least one of 153, 137, 122, 109, 97, 85, 81, 77, 74, 71, 68, 65, 63, 60, 57, 55, 53, 51, 50, 48, 47, and 45. According to the information transmission method and apparatus provided in this application, information used to generate a random access preamble sequence can be configured for a terminal device.