Terminal Device PDCCH Monitoring Offset for Satellite Msg4 Reception
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Solution Overview
Problem
In regenerative payload satellite networks, there is a time difference between when the MAC layer generates contention resolution information and the RRC layer generates the RRC configuration message, making it challenging to receive the corresponding Msg4 during random access procedures.
Innovation Solution
A communication method is introduced where a starting moment offset is determined based on the event triggering the random access procedure to delay the start of monitoring the PDCCH, allowing the terminal device to receive the Msg4, which may include contention resolution information and RRC configuration message, at the appropriate time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal device monitors PDCCH immediately after sending Msg3, then it can receive contention resolution information promptly, but it cannot receive the RRC configuration message which is sent later by the CU
Solution Approach 1:
The patent applies dynamics by making the PDCCH monitoring timing flexible rather than fixed. The terminal device dynamically adjusts the starting moment of PDCCH monitoring based on the type of random access procedure event. For events where the RRC configuration message is included in Msg4, the terminal delays PDCCH monitoring to accommodate the later arrival time of the RRC message from the CU, ensuring both contention resolution information and RRC configuration can be received correctly.
2Adaptability or versatility
If the terminal device delays PDCCH monitoring to receive RRC configuration message, then it can receive complete Msg4 content, but it increases the time loss for receiving contention resolution information
Solution Approach 1:
The patent applies preliminary action by pre-determining the appropriate PDCCH monitoring starting moment based on the random access procedure event type before the actual message reception occurs. The terminal device uses the event information to proactively set the timing offset, ensuring that the PDCCH monitoring is synchronized with the expected arrival time of the complete Msg4 content including both contention resolution information and RRC configuration message.
3Reliability
If the terminal device continuously monitors PDCCH, then it can receive Msg4 at any time, but it consumes excessive energy
Solution Approach 1:
The patent applies periodic action by replacing continuous PDCCH monitoring with periodic monitoring at specifically determined time points. Instead of continuously monitoring the PDCCH channel, the terminal device calculates and monitors at discrete starting moments based on the random access procedure event type. This periodic approach maintains reliable message reception while significantly reducing energy consumption by keeping the receiver off between monitoring intervals.
Data Source
AI summary
A communication method, a terminal device, and a network device are disclosed. The method is applied to a terminal device, and includes: determining a starting moment offset according to an event triggering a random access procedure, wherein the starting moment offset is configured to delay starting monitoring a physical downlink control channel (PDCCH); receiving a message 4 (Msg 4) from a network device according to the starting moment offset, wherein the message 4 is contention resolution information, or the message 4 comprises the contention resolution information and a radio resource control (RRC) configuration message.