Sidelink Data Transmission via Common Resources in NB-IoT
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Solution Overview
Problem
In NB-IoT applications, the PRACH procedure requires multiple steps for contention resolution, leading to significant power consumption and reduced transmission efficiency, especially during small data packet transmissions.
Innovation Solution
A method involving a wireless communication device and node that utilizes pre-configured common resources for data transmission, where a message with configuration information is transmitted, and a timer is started, allowing monitoring of a physical control channel before receiving a response, thereby reducing the number of steps in the PRACH procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional multi-step PRACH procedure is used for contention resolution, then reliability of connection establishment is improved, but power consumption increases and transmission efficiency decreases
Solution Approach 1:
The patent applies preliminary action by performing data transmission during the PRACH procedure itself, before the traditional connection establishment is complete. The user terminal transmits small data packets in the third message (Msg3) of the PRACH procedure, and the network transmits corresponding data in the fourth message (Msg4), enabling data to be sent before the RRC connection is fully established. This preliminary data transmission reduces the need for prolonged connection maintenance and reduces power consumption.
Solution Approach 2:
The patent extracts the data transmission function from the traditional connection establishment process. Instead of requiring complete connection establishment before data transmission, the invention separates data transmission from the connection setup procedure, allowing data to be transmitted as part of the PRACH messages themselves. This extraction enables early data transmission without completing the full connection establishment, reducing power consumption while maintaining reliability.
2Reliability
If a traditional multi-step PRACH procedure is used for contention resolution, then reliability of connection establishment is improved, but transmission efficiency decreases
Solution Approach 1:
The patent applies preliminary action by performing data transmission during the PRACH procedure itself, before the traditional connection establishment is complete. The user terminal transmits small data packets in the third message (Msg3) of the PRACH procedure, and the network transmits corresponding data in the fourth message (Msg4), enabling data to be sent before the RRC connection is fully established. This preliminary data transmission reduces the need for prolonged connection maintenance and reduces power consumption.
Solution Approach 2:
The patent merges the data transmission function with the connection establishment procedure. By combining data transmission with the PRACH messages (Msg3 and Msg4), the invention eliminates the need for separate data transmission steps after connection establishment. This merging of functions improves transmission efficiency by reducing the total number of steps required for both connection setup and data delivery.
3Use of energy by moving object
If the number of steps in PRACH procedure is reduced, then power consumption decreases and transmission efficiency improves, but contention resolution reliability may worsen
Solution Approach 1:
The patent applies preliminary action by performing data transmission during the PRACH procedure itself, before the traditional connection establishment is complete. The user terminal transmits small data packets in the third message (Msg3) of the PRACH procedure, and the network transmits corresponding data in the fourth message (Msg4), enabling data to be sent before the RRC connection is fully established. This preliminary data transmission reduces the need for prolonged connection maintenance and reduces power consumption.
Solution Approach 2:
The patent implements feedback mechanisms to ensure reliable contention resolution despite reduced steps. The network provides feedback in Msg4 to confirm successful reception and transmission of data, and the user terminal can detect whether contention resolution was successful based on receiving this feedback. This feedback ensures reliability is maintained even with fewer procedural steps.
Data Source
AI summary
A method and apparatus for synchronization in sidelink communications is disclosed. In one embodiment, a method for performing sidelink communications, the method includes: receiving a first message by the wireless communication device from a wireless communication node, wherein the first message comprises configuration information of at least one common resource; transmitting a second message to the wireless communication node on the at least one common resource and starting a first timer, wherein the second message comprises a first identification of the wireless communication device; after the transmitting, monitoring a common physical control channel corresponding to the second message; and receiving a third message on the common physical control channel from the wireless communication node on the at least one common resource before an expiration of the first timer.