Random Access Timing Control for Large-Bandwidth Terminal Processing
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Solution Overview
Problem
Existing wireless communication systems face challenges in smoothly performing random access procedures, particularly in determining processing times and resource allocation during 4-step random access in wireless communication systems, which are not addressed in addressing the allocation of resources during 4-step random access procedures, and in setting time limits for retransmissions when errors occur.
Innovation Solution
A method and apparatus for controlling terminal processing time during a random access procedure by transmitting message 1, receiving downlink control information, and transmitting physical random access channels based on specific time lengths and resource block allocations, ensuring smooth communication by adjusting to the size of sub-carrier spacing and resource block groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal processes PDSCH with large number of PRBs, then the communication capacity is improved, but the processing time required increases beyond the standard time limit
Solution Approach 1:
The patent applies dynamics by making the processing time requirement adaptive rather than fixed. The time limit for processing PDSCH is dynamically adjusted based on the actual number of PRBs received, allowing terminals to process larger bandwidths with extended time when necessary, while maintaining standard time limits for conventional cases. This resolves the contradiction by allowing communication capacity to scale with processing time flexibility.
Solution Approach 2:
The patent changes the parameter of processing time limit based on the parameter of PRB quantity. When the number of PRBs exceeds a threshold, the processing time limit is extended proportionally. This parameter change allows the system to accommodate larger communication capacities while maintaining acceptable processing time requirements, resolving the contradiction between productivity and time loss.
2Productivity
If the standard processing time limit is enforced, then the procedure efficiency is improved, but terminals cannot process large bandwidth allocations
Solution Approach 1:
The processing time limit is made dynamic and adaptive to the actual PDSCH bandwidth allocation. The patent introduces a mechanism where the time limit automatically adjusts based on the number of PRBs received, enabling terminals to adapt to various bandwidth conditions. This resolves the contradiction by maintaining procedure efficiency for standard cases while providing adaptability for large bandwidth allocations.
Solution Approach 2:
The patent changes the processing time parameter based on the bandwidth allocation parameter (number of PRBs). When large bandwidth allocations are detected, the processing time parameter is increased accordingly. This allows the system to maintain efficiency for conventional operations while achieving versatility in handling different bandwidth scenarios.
3Speed
If the terminal transmits PRACH immediately after PDSCH, then the response time is improved, but the processing time is insufficient for large bandwidth allocations
Solution Approach 1:
The patent applies dynamics by making the time interval between PDSCH and PRACH transmission adaptive. The response time is dynamically adjusted based on the number of PRBs received, ensuring sufficient processing time for large bandwidth allocations while maintaining fast response for conventional cases. This resolves the contradiction between speed and reliability by allowing both quick response and complete processing when needed.
Solution Approach 2:
The patent changes the time parameter for PRACH transmission based on the PDSCH bandwidth parameter. When large bandwidth allocations are detected, the transmission time is delayed accordingly to ensure processing completeness. This parameter change allows the system to maintain fast response times for standard operations while ensuring reliability for large bandwidth scenarios.
Data Source
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AI summary
The present disclosure relates to controlling a terminal processing time during a random access procedure in a wireless communication system, and a method performed by a terminal may include transmitting a message 1 for a random access procedure, receiving downlink control information (DCI) that schedules a message 2, receiving a physical downlink shared channel (PDSCH) scheduled by the DCI through physical resource blocks (PRBs) allocated by the DCI, based on failure of a physical random access channel (PRACH) procedure being determined based on a situation related to the message 2, transmitting a PRACH no later than a first time length after a last symbol of the PDSCH, and based on the PDSCH including a random access response (RAR) message including a uplink grant that schedules a physical uplink shared channel (PUSCH), transmitting a message 3 through the PUSCH so that a time between the last symbol of the PDSCH and a first symbol of the message 3 is not smaller than a second time length.