Layer 2 PDU Set Association for Reliable XR Packet Scheduling
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Solution Overview
Problem
In extended reality (XR) services, when packet delay budget exceeds the arrival period of protocol data unit (PDU) sets, it becomes difficult for base stations to distinguish which media access control (MAC) service data units belong to a specific PDU set, leading to challenges in optimizing transmission reliability and scheduling for subsequent PDU sets.
Innovation Solution
A wireless transmission device is equipped with a processor that determines an indication of a PDU belonging to a PDU set and transmits this indication to another wireless transmission device via a transceiver. The indication can be included in various layer 2 headers, MAC control elements, buffer status report (BSR) MAC elements, or layer 2 headers of BSR MAC elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission is performed for a PDU set, then transmission reliability is improved, but adjacent PDU sets may arrive at the same period making them difficult to distinguish
Solution Approach 1:
The patent applies preliminary action by inserting an indication of the PDU set into the layer 2 header or MAC control element before transmission. This allows the receiving base station to identify which PDU each packet belongs to in advance, preventing confusion when retransmitted packets arrive simultaneously with adjacent PDU sets. The indication is prepared and attached beforehand, ensuring that even when timing causes overlap, the identity information is already present for correct routing.
2Productivity
If the base station receives packets without clear PDU set association, then resource allocation efficiency decreases, and it becomes difficult to determine which PDU set fails transmission
Solution Approach 1:
The patent implements feedback by including the PDU set indication in the transmitted packets, which provides the base station with immediate feedback information about which PDU set each packet belongs to. This enables the base station to efficiently schedule resources for each PDU set and quickly identify which specific PDU set experienced transmission failure, as the indication travels with the data and allows for precise tracking of transmission status per PDU set.
Data Source
AI summary
The present application relates to a wireless transmission device and method for indicating association of PDU set. The wireless transmission device determines an indication of a PDU belonging to a PDU set. The indication is associated with the PDU set. The wireless transmission device transmit the indication to another wireless transmission device. The indication is included in at least one of: a layer 2 header of the PDU, a MAC CE associated with the PDU, a BSR MAC CE, and a layer header of the BSR MAC CE.