Random Access Response Retransmission for Decoding Reliability
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Solution Overview
Problem
In wireless communication networks, the random access procedure is hindered by the inability of user equipment (UE) to properly decode random access response messages from base stations, leading to repeated attempts and delayed uplink transmissions, and similarly, if the base station fails to decode uplink messages, requiring UE to reinitiate the process.
Innovation Solution
The base station retransmits the random access response message multiple times, with the number of retransmissions predetermined or determined by the UE, and includes features like initializing a monitoring timer, measuring signal quality, and providing retransmission information within the message to ensure successful decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the base station transmits the random access response message only once, then the transmission time is reduced, but the likelihood of successful decoding by the UE deteriorates
Solution Approach 1:
The base station transmits the random access response message multiple times at periodic intervals (first retransmission time, second retransmission time, etc.) to ensure the UE has sufficient opportunities to decode the message successfully, thereby resolving the contradiction between transmission time and decoding reliability
2Reliability
If the UE repeats the random access process due to decoding failure, then the uplink transmission delay increases, but the decoding reliability improves through retransmission
Solution Approach 1:
The base station performs preliminary retransmissions of the random access response message before the UE attempts uplink transmission. By ensuring the UE receives and decodes the response message successfully through multiple predetermined retransmission attempts, the system prevents subsequent retransmission delays and ensures timely uplink transmission
3Reliability
If the base station retransmits the random access response message multiple times, then the decoding reliability improves, but the transmission time increases
Solution Approach 1:
The base station implements periodic retransmissions at predetermined time intervals (first retransmission time, second retransmission time) to balance between ensuring decoding reliability and limiting the total transmission duration. This periodic approach ensures the UE has sufficient opportunities to decode the message while preventing indefinite retransmission delays
Data Source
AI summary
Aspects of the disclosure relate to improvements in random access procedures within a wireless communication network. To increase the likelihood that a user equipment (UE) will properly decode a random access response message from a base station, the base station may retransmit the random access response message one or more times. The number of retransmissions may be fixed or may be variable depending on whether the base station is able to receive or successfully decode a subsequently transmitted uplink message.