Millimeter-Wave Radio Bearer Setup for Faster Device-to-Device Links
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing device-to-device communications over sidelinks, particularly in millimeter wave frequencies, due to issues with beam pair link acquisition and resource utilization.
Innovation Solution
The method involves obtaining connection setup parameters for a millimeter wave unicast sidelink from a previously established non-millimeter wave link, using these parameters to expedite beam pair link acquisition and resource utilization, and configuring data radio bearers based on device-to-device discovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If device-to-device communications are established over millimeter wave frequencies, then data transfer speeds are improved, but beam pair link acquisition time increases
Solution Approach 1:
The patent applies preliminary action by establishing device-to-device communications over non-millimeter wave frequencies first, where beam pair links can be acquired more quickly. The UE uses this initial connection to exchange RRC messages and establish data radio bearers before transitioning to millimeter wave frequencies, thereby avoiding the time-consuming beam pair link acquisition process on mmW frequencies during the initial connection setup.
Solution Approach 2:
The patent segments the communication establishment process into two distinct phases: first establishing control plane and user plane connections over non-millimeter wave frequencies, then transitioning to millimeter wave frequencies for enhanced data transfer. This segmentation allows the system to leverage the speed advantage of mmW frequencies for data transmission while avoiding the time penalty of beam pair link acquisition on mmW frequencies during initial setup.
2Productivity
If millimeter wave frequencies are used for device-to-device communications, then spectral efficiency is improved, but connection establishment complexity increases
Solution Approach 1:
The patent uses preliminary action by first establishing the RRC connection and data radio bearers over non-millimeter wave frequencies, where the communication parameters and bearer configurations can be agreed upon more simply. Once these preliminary connections are established, the UE can efficiently transition to millimeter wave frequencies for high-speed data transmission, thereby achieving high spectral efficiency without the full complexity of mmW connection establishment.
3Loss of time
If beam pair link acquisition is expedited, then connection establishment time is reduced, but resource utilization efficiency may worsen
Solution Approach 1:
The patent segments the connection establishment process into two phases with different resource requirements. In the first phase over non-millimeter wave frequencies, the system uses simpler resources to establish control plane and user plane connections quickly. In the second phase, once the UE is ready for mmW operation, the system transitions to millimeter wave frequencies to utilize high-speed data transmission resources, thereby achieving both fast establishment and efficient resource utilization.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a first user equipment (UE) establishes a radio resource control (RRC) connection for a communication session with a second UE, establishes a signaling radio bearer (SRB) for the communication session with the second UE on a first frequency band, sends, to the second UE over the SRB on the first frequency band, a first RRC message to establish a data radio bearer (DRB) for the communication session on a second frequency band, the first RRC message including one or more parameters for establishing the DRB on the second frequency band, and configures the DRB on the second frequency band based on the one or more parameters in the first RRC message and/or a device-to-device discovery procedure performed in the first frequency band.