Paging Signal Uplink Grant for LC-MTC Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low Complexity Machine Type Communication (LC-MTC) UE devices face high battery power consumption and extended radio resource usage due to repeated PRACH and RAR processes in coverage enhancement mode, which decrease spectral efficiency and increase operational complexity.
Innovation Solution
The proposed solution involves providing additional information during the paging operation to allow LC-MTC terminal devices to send the RRC connection request message directly, bypassing the need for PRACH and RAR processes, thereby reducing the number of repetitions and improving power consumption and network usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH and RAR processes are repeated multiple times for coverage enhancement, then communication reliability is improved, but battery power consumption increases
Solution Approach 1:
The network pre-configures uplink grants and message 3 resources during the paging message transmission, so that the UE can directly send the connection request without performing PRACH preamble transmission and RAR reception. This preliminary configuration eliminates the need for multiple repetition cycles, thereby maintaining communication reliability while significantly reducing battery power consumption.
2Reliability
If PRACH and RAR processes are repeated multiple times for coverage enhancement, then communication reliability is improved, but spectral efficiency decreases
Solution Approach 1:
The network pre-allocates and signals uplink grant information and message 3 resources in advance through the paging message. This allows the UE to transmit the connection request directly in a single uplink transmission opportunity, eliminating the need for multiple PRACH repetition cycles and RAR receptions, thereby significantly improving spectral efficiency while maintaining communication reliability.
3Length of stationary object
If PRACH and RAR processes are repeated multiple times for coverage enhancement, then coverage is extended, but operational complexity increases
Solution Approach 1:
The network provides pre-configured uplink grant information and message 3 resource allocations in the paging message, enabling the UE to directly transmit the connection request without undergoing the complex multi-step PRACH and RAR process. This preliminary configuration simplifies the operational procedure while maintaining extended coverage capability.
4Length of stationary object
If PRACH and RAR processes are repeated multiple times for coverage enhancement, then coverage is extended, but radio resource usage increases
Solution Approach 1:
The network pre-configures and signals uplink grants and message 3 resources during the paging phase, allowing the UE to complete the connection request transmission in a single uplink opportunity. This eliminates the need for extended multi-cycle PRACH repetition and RAR reception processes, thereby reducing radio resource usage time while maintaining extended coverage.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A terminal device for use in a wireless telecommunications system comprises a transceiver configured to perform wireless communication with a base station; and a controller configured to: control the transceiver to detect a wireless paging signal from the base station; detect whether the paging signal comprises information defining an allocation of a communications resource for use by the terminal device to send a connection request message to the base station; control the transceiver, in response to a detection that the paging signal does not comprise information defining the allocation of the communications resource, to perform a radio channel allocation procedure with the base station in order for the terminal device to be allocated the communications resource; and control the transceiver to establish wireless communication with the base station by sending the connection request message using the allocated communications resource.