Extended Random Access Method for IoT Small Data Transmission
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Solution Overview
Problem
In legacy communication systems, IoT and MTC devices face inefficiencies in establishing connections due to wasteful RA procedures for transmitting small data, leading to excessive signaling exchanges and potential contention failures during the RA contention phase.
Innovation Solution
An extended RA method that includes a piggyback indicator in Msg #3 to indicate additional small data, allowing the eNB to allocate resources efficiently and reduce signaling overhead by potentially eliminating redundant RA procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices perform traditional RA procedure followed by RRC connection procedure to transmit small data, then connection establishment is achieved, but signaling overhead and energy consumption increase
Solution Approach 1:
The invention extracts and transmits small data directly within the RA procedure messages (specifically in Msg3 and Msg4), removing the need for the separate RRC connection procedure. This extraction of data transmission from the traditional connection setup process eliminates redundant signaling exchanges and reduces energy consumption while maintaining reliable connection establishment.
2Loss of energy
If payload is transmitted in Msg3, then signaling overhead is reduced, but payload size is limited by Msg3 capacity
Solution Approach 1:
The invention segments the data transmission process into multiple stages: first transmitting small data in Msg3, then using a piggyback indicator to signal whether additional data follows in subsequent messages. This segmentation allows the system to handle payloads larger than Msg3 capacity by dividing them across multiple transmission opportunities while still reducing overall signaling overhead compared to traditional procedures.
Solution Approach 2:
The invention maintains continuity of data transmission by allowing the RA procedure to be extended with additional data carriers. The piggyback indicator enables seamless continuation of payload transmission in subsequent messages without interrupting the RA process, ensuring that data transmission remains continuous even when payload exceeds initial message capacity.
3Quantity of substance
If multiple RA procedures are repeated to transmit fragmented payload, then complete data transmission is achieved, but efficiency decreases due to redundant signaling
Solution Approach 1:
The invention merges multiple data transmission opportunities into a single extended RA procedure. By combining Msg3, Msg4, and potential additional message exchanges into one cohesive process governed by the piggyback indicator, the system transmits fragmented payloads without requiring separate RA procedures for each fragment, thereby eliminating redundant signaling and improving transmission efficiency.
4Reliability
If MTC device fails during RA contention phase, then re-transmission is required, but additional signaling overhead is generated
Solution Approach 1:
The invention performs preliminary data transmission during the RA procedure itself rather than waiting for separate data channels. By transmitting as much data as possible in Msg3 and Msg4 within the contention phase, the system reduces the likelihood and impact of re-transmissions, as critical data is already delivered before potential contention failures occur.
Data Source
AI summary
The disclosure is directed to an extended RA method used by a UE and by a base station and related apparatuses using the same method. In an aspect, the disclosure is directed to an extended RA method used by a UE. The method includes not limited to transmitting a random access preamble (RAP); receiving a random access response (RAR) which responds to the RAP; transmitting an RA request signal which corresponds to the RAR and includes a first small data and a piggyback indicator which indicates whether there is a second small data to be transmitted; and receiving an RA request acknowledgment signal which corresponds to the RA request signal and comprises an uplink grant which indicates a resource for the second small data.