Uplink Grant and Radio Bearer Indicator Mapping in LTE
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need for more precise control over radio bearer scheduling to ensure that uplink grants are effectively used for specific radio bearers, as existing methods do not guarantee that the received uplink grant is utilized for the intended radio bearer.
Innovation Solution
A method where user equipment (UE) receives a first uplink grant and a radio bearer indicator, generating a Medium Access Control Protocol Data Unit (MAC PDU) containing data only for the indicated radio bearer and transmitting it using the grant, with the grant and indicator received through Downlink Control Information (DCI) or downlink MAC PDU, allowing for specific allocation and utilization of resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink grant is transmitted without radio bearer indicator, then the signaling overhead is reduced and transmission is simpler, but the UE cannot guarantee that the grant is used for the intended radio bearer
Solution Approach 1:
The patent combines the uplink grant and radio bearer indicator into a single DCI message, allowing the UE to receive both pieces of information together. This merging approach ensures that the grant is reliably associated with the correct radio bearer while maintaining efficient signaling through a unified message structure.
Solution Approach 2:
The radio bearer indicator acts as an intermediary element that links the uplink grant to the specific radio bearer. By introducing this indicator field in the DCI, the system enables precise mapping between grants and bearers without requiring complex separate signaling mechanisms.
2Adaptability or versatility
If multiple uplink grants are transmitted for different radio bearers, then resource allocation flexibility is improved, but the risk of UE using wrong grant for wrong bearer increases
Solution Approach 1:
The patent segments the resource allocation by associating each uplink grant with a specific radio bearer indicator. This segmentation allows multiple grants to be transmitted for different bearers while maintaining clear identification of which grant applies to which bearer, preventing mismatches.
Solution Approach 2:
Each DCI message is customized with a specific radio bearer indicator that matches the intended bearer's characteristics. This local quality approach ensures that each grant-bearer pair has the appropriate identification, enabling flexible resource allocation while maintaining accuracy.
3Productivity
If the UE generates MAC PDU with data from multiple radio bearers, then transmission efficiency is improved, but the network cannot ensure proper QoS for each bearer
Solution Approach 1:
The patent segments the MAC PDU generation process by creating separate MAC PDUs for different radio bearers. Each MAC PDU is associated with a specific bearer indicator, allowing the network to maintain QoS guarantees for each bearer while still achieving efficient transmission through dedicated resource allocation.
Solution Approach 2:
Each MAC PDU is generated with specific quality characteristics appropriate to its associated radio bearer. By maintaining separate MAC PDUs for different bearers with appropriate QoS parameters, the system ensures that each bearer receives the required service quality while transmitting data efficiently.
Data Source
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, by a user equipment (UE), data in a wireless communication system, the method comprising: receiving a first uplink grant for a radio bearer and a first radio bearer indicator of the radio bearer; generating a Medium Access Control Protocol Data Unit (MAC PDU) containing a data of only the radio bearer indicated by the first radio bearer indicator; and transmitting the MAC PDU using the first uplink grant.