Random Access Response Reception Window Segmentation
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Solution Overview
Problem
The existing random access procedures in mobile communication technologies suffer from confusion between random access responses for different Physical Random Access Channel (PRACH) Resource Occupancies (ROs) due to identical Random Access Radio Network Temporary Identifiers (RA-RNTIs) being calculated based on time-frequency resource positions.
Innovation Solution
A method and device for receiving a random access response, where a terminal equipment monitors a Physical Downlink Control Channel (PDCCH) scheduling a random access response in a specific time window, avoiding confusion by using distinct RA-RNTIs for different PRACH ROs, and a network device transmits indication information to the terminal equipment to define the reception time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RA-RNTI is calculated based on time-frequency resource positions of PRACH ROs, then random access response scheduling is enabled, but confusion between random access responses for different PRACH ROs occurs due to identical RA-RNTIs
Solution Approach 1:
The patent segments the random access response reception process by introducing separate time windows for different PRACH RO types. Four-step random access responses are received in a first time window, while two-step random access responses are received in a second time window. This temporal segmentation prevents confusion between responses with identical RA-RNTIs by ensuring they are processed in distinct time intervals.
Solution Approach 2:
The patent adds a time dimension to differentiate between random access responses. By defining separate reception time windows (first time window for four-step, second time window for two-step procedures), the system transforms the identification problem from relying solely on RA-RNTI (one dimension) to incorporating time window information (additional dimension), thereby enabling accurate response identification even when RA-RNTIs are identical.
2Device complexity
If a single PDCCH monitoring approach is used for random access responses, then device complexity is reduced, but confusion between four-step and two-step random access responses occurs
Solution Approach 1:
The patent implements dynamic PDCCH monitoring by configuring different monitoring behaviors for different time windows. The terminal equipment monitors PDCCH in a first time window for four-step random access responses and in a second time window for two-step random access responses. This dynamic approach allows the system to adapt monitoring parameters based on the random access procedure type, improving response identification accuracy while maintaining reasonable device complexity through standardized monitoring configurations.
Data Source
AI summary
Methods and devices for transmitting and receiving a random access response includes a transmitter configured to transmit a first message (MsgA) of a two-step random access procedure to a network device, the first message (MsgA) comprises a preamble and data; and a processor configured to control to perform to monitor, in a first random access response reception time window, a physical downlink control channel (PDCCH) scheduling a first random access response in a two-step random access procedure transmitted by the network device, the first random access response including a C-RNTI and contention resolution information, wherein the processor is further configured to control to perform to monitor, in the first random access response reception time window, the PDCCH scheduling a second random access response transmitted by the network device, the second random access response including a TC-RNTI and an uplink resource grant used for transmitting a third message.