Two-Step Random Access Feedback Reporting
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Solution Overview
Problem
The existing two-step random-access procedure in wireless communications systems incurs increased latency and overhead due to unnecessary decoding and retransmissions, as user equipment (UE) attempts to decode data channel portions that may only contain timing advance information, wasting resources and power.
Innovation Solution
The UE manages flow control feedback reporting based on determining whether the data channel portion includes a radio resource control (RRC) message, suppressing decoding and uplink timing adjustments when an RRC message is not present and the timing advance timer is running, and performing adjustments only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE attempts to decode the data channel portion to determine whether it includes an RRC message, then the UE can accurately identify the message type, but the latency and power consumption increase due to unnecessary decoding operations
Solution Approach 1:
The patent extracts the RRC message identification function from the data channel portion decoding process. Instead of decoding the entire data channel portion to identify message type, the UE extracts only the necessary timing advance information from the control channel portion and determines message type through flow control feedback reporting rules, eliminating unnecessary decoding operations and reducing latency
Solution Approach 2:
The patent applies preliminary action by having the UE determine whether the data channel portion includes an RRC message before actually decoding it. The UE uses the control channel portion information and flow control feedback reporting rules to make this determination in advance, avoiding the time-consuming decoding process when the data channel portion only contains timing advance information
2Reliability
If the UE decodes the data channel portion to check for RRC messages, then the UE can process messages accurately, but the power consumption increases due to unnecessary decoding and processing
Solution Approach 1:
The patent extracts only the essential timing advance information from the control channel portion and uses flow control feedback reporting rules to determine message type, eliminating the need to decode the entire data channel portion. This extraction approach maintains message processing accuracy while significantly reducing power consumption by avoiding unnecessary decoding operations
Solution Approach 2:
The patent applies partial action by performing only the necessary decoding of the control channel portion to obtain timing advance information, rather than fully decoding the data channel portion. The UE takes partial action sufficient to determine message type through flow control feedback reporting rules, avoiding excessive power consumption while maintaining processing accuracy
3Loss of information
If the UE performs flow control feedback reporting for every response, then the base station receives complete feedback information, but the overhead increases due to unnecessary feedback transmissions
Solution Approach 1:
The patent implements a conditional feedback mechanism where the UE reports flow control feedback only when the data channel portion includes an RRC message. The feedback reporting rule is designed to provide complete necessary information to the base station while avoiding unnecessary feedback transmissions, thus reducing overhead without losing essential information
Solution Approach 2:
The patent applies the principle of discarding unnecessary feedback reporting when the data channel portion contains only timing advance information. The UE discards the feedback transmission in cases where it is not needed, while the base station can recover the necessary information through other means or infer the state based on the absence of feedback, thus reducing overall overhead
4Reliability
If the UE transmits flow control feedback for timing advance only responses, then the base station maintains accurate timing information, but the overhead and latency increase due to unnecessary retransmissions
Solution Approach 1:
The patent implements selective feedback reporting where the UE determines whether to transmit flow control feedback based on the content of the data channel portion. When the response contains only timing advance information, the UE suppresses feedback transmission since the timing advance can be directly applied, maintaining timing information accuracy while improving procedure efficiency by avoiding unnecessary feedback cycles
Solution Approach 2:
The patent applies discarding by eliminating unnecessary flow control feedback transmissions when the response contains only timing advance information. The base station recovers the necessary timing information directly from the control channel portion without requiring additional feedback transmissions, thus maintaining reliability while improving productivity by reducing overhead and latency
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A UE may transmit a random-access message to a base station and receive at least a control channel portion of a response to the random-access message from the base station, where the response may also include a data channel portion. Using the techniques described herein, the UE may then manage flow control feedback reporting to the base station based on whether the data channel portion includes a radio resource control (RRC) message. For instance, the UE may report an acknowledgment for the response if the data channel portion does not include an RRC message and a TA timer at the UE is running (e.g., regardless of whether the UE is able to or attempts to decode the data channel portion, since the data channel portion may only include TA information which may not be useful to the UE).