US 9,756,523 B2Granted

Enhanced mechanism of uplink time alignment maintenance for inter-eNB carrier aggregation

AssigneeMediaTek Singapore Pte. Ltd.

InventorsYuanyuan Zhang, Chia-Chun Hsu

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Abstract

Apparatus and method are provided to enhance buffer status report (BSR) to multiple schedulers with inter base station carrier aggregation. In one novel aspect, the UE calculates a buffer size value, detects a BSR trigger event, selects one or more base stations (BSs) to send the BSR reports and generates the BSR reports for the selected one or more BSs. In one embodiment, one BS is selected based on predefined criteria. In other embodiments, multiple base stations are selected. In one embodiment, the same contents for BSR are generated. In another embodiment, different BSR reports are generated for different base stations from which the UE receives UL grants. In one novel aspect, the UE calculates a buffer size value and determines if a budget BSR triggering criteria is satisfied. The UE triggers budget BSR procedure by sending a budget BSR report to a selected base station based on predefined thresholds.

Claims22

Dependent claims

A method comprising:

calculating a buffer status value by a user equipment (UE) in a multi-carrier wireless network with inter-base station carrier aggregation (CA), wherein the UE is configured with multiple logical channels (LCs) that belong to one or more logical channel groups (LCGs);
detecting a buffer status report (BSR) triggering event;
selecting a plurality of base stations for a plurality of BSR reports, wherein the UE receives uplink (UL) resource grants for a new transmission from multiple base stations;
generating a plurality of BSR reports for the selected plurality of base stations, wherein different BSR reports are generated for different base stations from which the UE receives UL grants, and wherein the BSR reports is generated selecting from one of the formats comprising:
one BSR report is generated for each LCG, and wherein all LCs in each LCG are related to the same base station, multiple BSR reports are generated for each LCG, and wherein LCs in the same LCG are related to different base stations, and wherein the sum of buffer status values in the multiple BSR reports for each LCG equals to the full buffer status value of the LCG, multiple BSR reports are generated for each LCG to be sent to different base stations, and wherein the full buffer status value for the LCG is split to the multiple BSR reports according to a predefined or preconfigured load ratio of corresponding base stations, and multiple BSR reports are generated for each LCG, and wherein each BSR report is generated for a preconfigured non-overlapping subset of LCs in a LCG, and wherein each preconfigured subset of LCs relate to the same base station;
and
transmitting the plurality of BSR reports to the selected plurality of base stations.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/804,461Filed 21 Jul 2015 · continuation
Priority: CN 2013 1 018474617 May 2013
Published: US 2015/0327116 A112 Nov 2015
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04W 28/0278
Traffic management, e.g. flow control or congestion control: using buffer status reports
H04W 72/21
Control channels or signalling for resource management: in the uplink direction of a wireless link, i.e. towards the network
H04W 88/02
Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices: terminal devices
H04W
Wireless communication networks