Idle State Random Access Uplink Resource Allocation
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Solution Overview
Problem
In LTE and LTE-A communications systems, user equipment (UE) in an idle state faces challenges in accurately allocating uplink resources during random access, leading to resource wastage and transmission delays due to the inability of the base station to accurately determine the volume of data to be sent based on the random access preamble.
Innovation Solution
The UE sends a buffer status report (BSR) as part of the random access message to the base station, allowing the base station to accurately allocate uplink resources, and subsequently sends data according to the allocated resource information, which includes priority information and contention resolution mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE sends only a random access preamble without BSR, then the random access process is simple and quick, but the base station cannot accurately determine the volume of data to be sent, leading to inaccurate resource allocation
Solution Approach 1:
The patent combines the random access preamble transmission with Buffer Status Report (BSR) transmission into a single uplink message. The UE embeds both the random access preamble (for contention resolution) and the BSR (for data volume indication) in the same uplink transmission, allowing the base station to simultaneously perform contention resolution and determine the volume of data to be sent, thereby resolving the technical contradiction between measurement precision and device complexity.
2Productivity
If the base station allocates uplink resources without accurate data volume information, then the resource allocation process is fast, but resources are wasted or multiple transmissions are required
Solution Approach 1:
The patent implements a feedback mechanism where the UE provides accurate data volume information through the BSR in the uplink message. The base station uses this feedback information to accurately determine the volume of data to be sent and allocate appropriate uplink resources in advance, avoiding both resource wastage and the need for multiple retransmissions, thereby resolving the contradiction between productivity and energy loss.
Data Source
AI summary
Embodiments of the present invention provide a method for random access in an idle state and a device. The method includes: sending, by user equipment (UE), a random access preamble to a evolved NodeB (eNB), and receiving a random access response message that is sent by the eNB according to the random access preamble; sending, by the UE, a first message to the eNB according to first uplink grant information; and receiving, by the UE, second uplink grant information sent by the eNB, and sending to-be-sent data to the eNB according to the second uplink grant information. According to the method for random access in an idle state and the device provided in the embodiments of the present invention, accuracy of uplink resource allocation is improved during random access of UE in an idle state.