Inter-site Carrier Aggregation Uplink Scheduling via Base Station Mediation
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Solution Overview
Problem
In LTE's Inter-site CA, there is a delay in uplink data transmission due to the radio base station not establishing the necessary bearer resources for the mobile station, leading to inefficient data scheduling across different base stations.
Innovation Solution
The mobile communication method involves establishing logical channels between the mobile station and multiple radio base stations, assigning scheduling request transmission resources, and notifying each base station of buffered data to ensure timely resource allocation for uplink data transmission, thereby bypassing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile station transmits a scheduling request to the first radio base station via the assigned resource, then the scheduling request can be transmitted using the assigned resource, but the uplink data transmission experiences delay because the first radio base station does not establish the bearer resources for the second logical channel
Solution Approach 1:
The first radio base station acts as an intermediary that receives the scheduling request from the mobile station, then forwards a buffer status report to the second radio base station. This mediator approach allows the mobile station to use the assigned scheduling resource at the first base station while enabling the second base station to allocate uplink resources, thereby resolving the contradiction between easy scheduling request transmission and timely uplink data transmission.
2Adaptability or versatility
If independent scheduling processing is performed at each radio base station, then each base station can autonomously manage its resources, but coordination between base stations becomes complex and delays occur in cross-base-station data transmission
Solution Approach 1:
The scheduling function is segmented between two radio base stations: the first base station handles scheduling request reception and maintains independent scheduling autonomy, while the second base station handles uplink resource allocation. This segmentation allows each base station to operate independently within its designated function while avoiding the complexity of full coordination, as each station performs only its specialized scheduling task.
3Productivity
If the mobile station establishes logical channels with multiple radio base stations for carrier aggregation, then wide-band communication capability is achieved, but resource allocation complexity increases and transmission delays occur
Solution Approach 1:
The complex resource allocation function for cross-base-station data is extracted from the first radio base station and assigned to the second radio base station. When uplink data needs to be transmitted on the second logical channel, the first base station simply forwards the buffer status information to the second base station, which then allocates the uplink resources. This extraction simplifies the first base station's role while enabling efficient multi-base-station carrier aggregation.
Data Source
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AI summary
Occurrence of a delay in transmission of uplink data in "Inter-site CA" is avoided. A mobile communication method according to the present invention includes the steps of: causing a mobile station UE to transmit an SR to a radio base station eNB#1 by using a PUCCH-SR; causing the radio base station eNB#1 to notify the mobile station UE of a "UL grant"; causing the mobile station UE to transmit a BSR in a bearer #B/LCH#B to the radio base station eNB#1 by using a PUSCH designated in the "UL grant"; causing the radio base station eNB#1 to notify a radio base station eNB#10 of an amount of buffered data in the bearer #B/LCH#B: and causing the radio base station eNB#10 to assign the mobile station UE a resource for transmission of uplink data upon receipt of the amount of buffered data.