Contiguous Space Allocation for LTE Data Multiplexing
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Solution Overview
Problem
In the LTE communication system, the dynamic nature of free space in MAC-PDUs leads to inefficient data transmission due to increased header sizes and subsequent division of PDCP-PDUs, resulting in decreased data throughput and potential failures in reassembling PDCP-PDUs with higher priorities, which can violate Quality of Service (QoS) requirements.
Innovation Solution
A communication apparatus that includes an acquisition unit for determining the size of free space in each data transmission unit, an allocation unit that allocates contiguous free space to each data unit of the second layer without division, and a multiplexing unit that minimizes the number of divided RLC-SDUs, thereby reducing header overhead and ensuring efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free space in MAC-PDUs is dynamically allocated without contiguous allocation, then data transmission flexibility is improved, but header size increases and data throughput decreases
Solution Approach 1:
The patent applies preliminary action by pre-allocating contiguous free space in MAC-PDUs before data transmission. The base station determines the size of contiguous free space in advance and notifies the mobile station, allowing both ends to perform data transmission and reassembly without dynamic fragmentation. This resolves the contradiction by maintaining transmission flexibility through pre-planned contiguous allocation while avoiding the header overhead and throughput degradation caused by dynamic non-contiguous allocation.
2Quantity of substance
If PDCP-PDUs are divided to fit variable free space, then space utilization is improved, but reassembly reliability decreases
Solution Approach 1:
The patent applies preliminary action by determining and notifying the size of contiguous free space before data transmission. This allows the mobile station to allocate exactly the required space without division, ensuring that each PDCP-PDU remains intact and can be reliably reassembled. The base station's advance notification enables both ends to coordinate their allocation, achieving high space utilization while maintaining reassembly reliability through contiguous, non-divided allocation.
3Adaptability or versatility
If non-contiguous free space allocation is used, then allocation flexibility is improved, but the number of divided RLC-SDUs increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the size of contiguous free space in MAC-PDUs before data transmission. The base station calculates and notifies this size to the mobile station in advance, enabling both ends to perform data transmission and reassembly without dynamic fragmentation. This resolves the contradiction by maintaining allocation flexibility through pre-planned contiguous allocation while minimizing the number of divided RLC-SDUs, as each allocation is made as a single contiguous block rather than multiple fragmented pieces.
Data Source
AI summary
A communication apparatus includes an acquisition unit that acquires a size of free space provided in each of a plurality of data transmission units of a first layer; and an allocation unit that allocates to each of a plurality of pieces of data of a second layer a contiguous sequence of free space from among the free space whose size is acquired by the acquisition unit, the contiguous sequence of free space being equal in size to each piece of data and provided in one of the data transmission units among the plurality of data transmission units. The apparatus also includes a multiplexing unit that multiplexes the plurality of pieces of data of the second layer into the plurality of data transmission units of the first layer according to the allocation of the free space by the allocation unit.