Logical Channel Group Prioritization for LTE Data Transmission
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting data using existing methods that require all logical channels to have data available before transmitting data from a specific radio bearer, limiting flexibility and efficiency in resource allocation.
Innovation Solution
A method for user equipment (UE) in a wireless communication system that receives a grant indicating specific logical channel groups for data transmission, generates a MAC PDU prioritizing data from those groups, and transmits using the grant, allowing for flexible allocation by changing priorities and bit rates within the indicated groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all logical channels are required to have data available before transmitting data from a specific radio bearer, then data transmission reliability is improved, but transmission efficiency and resource allocation flexibility deteriorate
Solution Approach 1:
The patent segments the logical channels into different logical channel groups (LCGs) and associates each LCG with specific radio bearers. This segmentation allows the MAC entity to independently select and transmit data from specific LCGs based on grant indications, rather than requiring all logical channels to have data available. This resolves the contradiction by enabling efficient resource allocation at the LCG level while maintaining reliability through proper data selection.
Solution Approach 2:
The patent introduces dynamic priority adjustment mechanisms where the MAC entity can change the priorities of logical channels within indicated LCGs during the MAC PDU assembly process. This dynamic adjustment allows the system to adapt to varying data availability and transmission requirements in real-time, improving transmission efficiency without compromising reliability by selectively prioritizing available data from specific LCGs.
2Ease of operation
If strict priority ordering is maintained for all logical channels, then fairness among different data types is improved, but flexibility in resource allocation deteriorates
Solution Approach 1:
The patent applies different priority rules to different logical channel groups based on grant indications. Within each indicated LCG, the MAC entity can adjust priorities locally to optimize resource allocation for that specific group, while maintaining overall fairness across different data types through the structured LCG framework. This local quality approach resolves the contradiction by allowing flexible resource allocation within LCGs while preserving fairness at the system level.
Solution Approach 2:
The patent enables dynamic parameter changes by allowing the MAC entity to modify priority values and data selection criteria for logical channels within indicated LCGs during the transmission process. This parameter flexibility allows the system to adapt resource allocation to current network conditions and data availability while maintaining fairness through the controlled adjustment mechanisms defined for LCG-based transmission.
3Reliability
If data from all logical channels must be assembled before transmission, then completeness of data transfer is improved, but transmission latency increases
Solution Approach 1:
The patent extracts the data assembly requirement from the global level to the LCG level. Instead of requiring all logical channels to have data available before transmission, the MAC entity only needs to assemble data from the specifically indicated LCGs. This extraction of the assembly requirement reduces the time needed for data preparation while maintaining completeness for the prioritized LCGs, thereby resolving the contradiction between completeness and latency.
Solution Approach 2:
The patent implements preliminary action by having the network pre-configure multiple LCGs with their associated radio bearers and priority relationships before data transmission. This preliminary configuration allows the MAC entity to quickly identify and assemble data from indicated LCGs without needing to process all logical channels, reducing transmission latency while ensuring complete data transfer for the prioritized groups through the pre-established LCG structure.
Data Source
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Figure 2b
Figure 3(a)~3(b)
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting data in a wireless communication system. According to an aspect of the present invention, the method comprising: receiving, from an enhanced Node B (eNB), a grant with an indication that indicates at least one logical channel group (LCG) of which data should be transmitted using the received grant, wherein each of radio bearers (RBs) configured to the UE is associated with a respective logical channel priority; generating a medium access control protocol data unit (MAC PDU) including data of RBs belonging to the indicated at least one LCG; and transmitting the MAC PDU using the grant.