Random Access Timing Control for PDSCH-PUCCH ACK 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 for ACK/NACK transmission during 2-step random access, and setting time limits for retransmissions in case of errors, which are crucial for enhancing communication reliability and latency-sensitive services.
Innovation Solution
A method and apparatus for controlling terminal processing time during random access procedures by transmitting message A, receiving downlink control information, and determining the timing for transmitting ACK/NACK based on sub-carrier spacing (SCS) and resource block group (RBG) sizes, ensuring adequate time intervals between PDSCH and PUCCH symbols, and setting time limits for retransmissions based on error conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If processing time is reduced to improve latency, then communication speed is improved, but processing accuracy and reliability deteriorate
Solution Approach 1:
The patent implements dynamic processing time adjustment based on random access procedure outcomes. The terminal determines different processing times for initial access versus retransmission scenarios, adapting the time parameters to the specific operational context to balance latency requirements with processing reliability
Solution Approach 2:
The patent changes time parameter values based on procedural state. Different K1 indicator values are used for initial random access versus retransmission, allowing the system to optimize processing time parameters according to the specific phase of communication to maintain reliability while managing latency
2Productivity
If resource allocation is optimized to improve communication efficiency, then system throughput is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback mechanisms where the terminal determines processing time based on the outcomes of random access procedures. The system adjusts resource allocation and timing parameters based on feedback from access attempts, enabling efficient resource utilization through adaptive control rather than complex static allocation
Solution Approach 2:
The patent segments the random access procedure into distinct phases (initial access, success, retransmission) with different processing time requirements. By dividing the overall procedure into manageable segments with specific timing characteristics, the system achieves efficient resource allocation without requiring complex holistic management
3Reliability
If time intervals between PDSCH and PUCCH are extended to ensure adequate processing, then processing reliability is improved, but communication latency increases
Solution Approach 1:
The patent dynamically adjusts the time interval between PDSCH and PUCCH based on the random access procedure state. For initial access, shorter intervals are used to minimize latency, while for retransmissions, the system adapts timing based on previous outcomes, maintaining reliability only when necessary
Solution Approach 2:
The patent performs preliminary determination of processing time parameters before actual data transmission. By pre-determining appropriate K1 indicator values and time intervals based on the current procedural state, the system ensures adequate processing time is allocated in advance without unnecessarily extending latency
4Speed
If retransmission time limits are reduced to improve response speed, then system responsiveness is improved, but error handling reliability deteriorates
Solution Approach 1:
The patent implements dynamic retransmission time limit adjustment based on error conditions. The system sets different maximum time limits for different retransmission scenarios, adapting the responsiveness parameters to the specific error state to balance quick response with reliable error handling
Solution Approach 2:
The patent establishes predetermined time limits for retransmission attempts before errors occur. By setting maximum time limits in advance for different retransmission scenarios, the system prepares appropriate response time buffers that ensure reliable error handling while maintaining overall system responsiveness
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 A for a random access procedure, receiving downlink control information (DCI) that schedules a message B, receiving a physical downlink shared channel (PDSCH) scheduled by the DCI through physical resource blocks (PRBs) allocated by the DCI, and in case a transport block (TB) provided by the PDSCH is not received properly or a random access preamble identifier (RAPID) associated with physical random access channel (PRACH) transmission from the terminal is not identified, transmitting the PDSCH, and in case the PDSCH includes a success random access response (success RAR), transmitting acknowledge (ACK) information through the PUCCH so that a time between the last symbol of the PDSCH and a first symbol of the PUCCH is not smaller than a second time length