Terminal Device MAC PDU Buffering for Uplink Resource Changes
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Solution Overview
Problem
Existing technologies fail to effectively address data transmission losses caused by changes in the size of uplink resources in communication systems, leading to potential data packet loss and handover failures.
Innovation Solution
A data transmission method and terminal device that receive first uplink resource allocation information and send a first MAC PDU over the indicated uplink resource, where the first MAC PDU is assembled using target data that includes at least the data content of a previously generated second MAC PDU, thereby enabling continued data transmission even with changes in uplink resource size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE buffers a MAC PDU in the previous time and waits for the next uplink resource, then the UE can prepare data for transmission, but when the size of the next uplink resource is different, the buffered MAC PDU cannot be sent, causing data packet loss
Solution Approach 1:
The patent applies preliminary action by having the UE generate and buffer the MAC PDU in advance during the previous random access procedure. When a new uplink resource is allocated, the UE can directly transmit the pre-generated MAC PDU without waiting for data preparation, ensuring continuous transmission even when uplink resource sizes change between procedures.
Solution Approach 2:
The patent addresses parameter changes by accommodating variations in uplink resource sizes between different random access procedures. The UE dynamically adjusts its transmission strategy based on the actual size of the received uplink grant, allowing the buffered MAC PDU to be successfully transmitted despite changes in resource allocation parameters.
2Productivity
If the UE initiates a non-contention-based random access procedure with changed uplink grant size, then the UE can proceed with new transmission, but the previous buffered MAC PDU cannot be sent over the new uplink grant, causing transmission failure
Solution Approach 1:
The UE generates and buffers the MAC PDU during the contention-based random access procedure before initiating the non-contention-based procedure. This preliminary preparation ensures that when the new uplink resource is allocated, the MAC PDU is ready for immediate transmission, maintaining both efficiency and reliability across procedure transitions.
Solution Approach 2:
The buffered MAC PDU acts as an intermediary element that bridges the two random access procedures. By retaining the previously generated MAC PDU in the buffer, the UE can seamlessly transition from the contention-based to the non-contention-based procedure without losing data, using the buffer as an intermediate storage that preserves transmission continuity.
3Device complexity
If the UE uses a fixed MAC PDU generation approach, then the procedure is simple, but it cannot adapt to changing uplink resource sizes, leading to data loss and potential handover failure
Solution Approach 1:
The patent introduces dynamics to the MAC layer by enabling the UE to adapt its behavior based on the actual size of the received uplink grant. The UE dynamically determines whether to transmit the buffered MAC PDU or generate a new one, adjusting its operation to match the current resource allocation and ensuring successful transmission across varying conditions.
Solution Approach 2:
The UE monitors and responds to changes in uplink resource parameters by adjusting its transmission strategy. When the uplink grant size differs from expectations, the UE modifies its approach to accommodate the new parameter, ensuring the MAC PDU can be successfully transmitted without causing data loss or handover failure.
Data Source
AI summary
Embodiments of this disclosure provide a data transmission method and a terminal device. The data transmission method includes receiving first uplink resource allocation information sent by a network side device. The first uplink resource allocation information is used to indicate a first uplink resource. The data transmission method further includes sending a first medium access control protocol data unit (MAC PDU) over the first uplink resource. The first MAC PDU is a PDU obtained through packet assembly on target data based on the first uplink resource. The target data includes at least data content of a second MAC PDU. The second MAC PDU is a previously generated MAC.