Prioritizing Public Safety BSR in Wireless MAC PDUs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LTE systems lack prioritization of Buffer Status Reports (BSR) for public safety and V2X transmissions, leading to potential delays in delay-sensitive communications, as they are often overshadowed by uplink BSRs, which can cause delays in critical public safety and vehicle-related communications.
Innovation Solution
The method prioritizes ProSe BSR for public safety and V2X transmissions by configuring dedicated D2D logical channels and timers, ensuring that these reports are transmitted with higher priority over other BSRs, even when only one BSR can be accommodated in a MAC PDU, and defines specific procedures for triggering and formatting BSRs for D2D transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink BSR is transmitted in MAC PDU, then uplink buffer status is reported, but public safety and V2X BSR transmissions are delayed due to lack of prioritization
Solution Approach 1:
The patent segments the BSR transmission by introducing a specific indicator field in the MAC PDU subheader that identifies whether the BSR is for uplink or ProSe (public safety/V2X) transmission. This segmentation allows the system to distinguish and prioritize different types of BSR transmissions, ensuring that critical ProSe BSRs are not delayed by regular uplink BSRs.
Solution Approach 2:
The patent changes the parameter structure of the MAC PDU subheader by adding a new indicator field (1 bit) that specifies the BSR type. This parameter change enables the system to differentiate between uplink BSR and ProSe BSR, allowing prioritized handling of public safety and V2X transmissions without affecting the overall MAC PDU structure.
2Productivity
If only one BSR can be accommodated in MAC PDU, then resource efficiency is improved, but critical public safety and V2X BSRs may be omitted
Solution Approach 1:
The patent introduces an intermediary indicator field in the MAC PDU subheader that acts as a mediator to identify the priority and type of BSR transmission. This indicator enables the system to select which BSR to transmit when only one can be accommodated, ensuring that critical public safety and V2X BSRs are prioritized over regular uplink BSRs while maintaining resource efficiency.
3Reliability
If dedicated D2D logical channels and timers are configured, then prioritization of ProSe BSR is achieved, but system complexity increases
Solution Approach 1:
The patent implements a universal indicator field in the MAC PDU subheader that can identify different types of BSR transmissions (uplink, ProSe, V2X) using a single bit. This multi-functional approach allows the system to handle multiple priority levels and transmission types without requiring separate complex configuration mechanisms for each, thereby reducing overall system complexity while maintaining prioritization capabilities.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method and apparatus for configuring a buffer status report (BSR) for a public safety transmission or a vehicle-related (V2X) transmission in a wireless communication system is provided. A user equipment (UE) configures a device-to-device (D2D) logical channel corresponding to the public safety transmission or the V2X transmission, and triggers a proximity-based services (ProSe) BSR for the D2D logical channel. The UE accommodates the triggered ProSe BSR in a media access control (MAC) protocol data unit (PDU) if the MAC PDU can accommodate only one BSR MAC control element (CE).