Amazon Technologies, Inc.

Microsoft Technology Licensing, LLC

Mohammad Mamunur Rashid

Deepak

Ali Masoomzadeh

Bulin Zhang

Baosheng Li

Kevin Lane Brown

Sandeep Ahluwalia

Todd J Abel

William Ritter Avery

Jyotirmoy Banik

Omer Atay

A satellite utilizes a scheduler to manage uplink contention by providing a user terminal (UT) with grants to use uplink resources. The scheduler may process buffer data status (BDS) information received from the UT that indicates data enqueued by the UT for transmission on the uplink. Based on the BDS the scheduler provides solicited grants to the UT. When there is no backlog of enqueued data on the uplink, unsolicited grants (USGs) are provided to the UT. The USGs provide the UT with access to the uplink without resorting to a high latency random-access channel. If the UT utilizes the USG, subsequent USGs may be provided at shorter repetition intervals. If the UT does not utilize the USG, subsequent USGs may be provided at longer repetition intervals. The changes to the repetition interval may be asymmetrical, such as decreasing additively and increasing multiplicatively.

System for allocation of unsolicited grants to access satellite uplink

Technologies directed to scheduling transmissions between a satellite system and customer terminals (CTs) with half-duplex (HD) radios are described. A communication system includes a radio, a modem with a HD controller, a downlink (DL) scheduler, and an uplink (UL) scheduler. The HD controller determines a first set of HD CTs that are eligible DL transmissions for a first radio frame and a second set of HD CTs that are eligible for UL transmissions for a second radio frame. The HD controller determines a throughput value and buffer information about each of the first set and the second set of HD CTs. The HD controller determines a first subset of HD CTs for DL scheduling and a second subset of HD CTs for UL scheduling. The DL scheduler schedules radio resources for a first radio frame and the UL scheduler schedules radio resources for a second radio frame.

Coordinated mac scheduling of half-duplex customer terminals in satellite internet systems

Techniques for improving the efficiency of transmitting data between devices are described. In an example, a first device transmits first data to a second device during a first time interval, whereby the second device is configured to communicate with the first device in a half-duplex mode. During a second time interval, the first device receives second data from the second device. The first device then determines that the second device transmitted the second data during a third time interval that is between the first time and the second time, and during which a reception of the first data by the second device is expected. The first device then retransmits the first data based at least in part on determining that the second device transmitted the second data during the third time interval.

Efficient synchronization of communication involving half-duplex systems

A satellite provides communication between user terminals (UTs) and ground stations that connect to other networks, such as the Internet. Because the satellite is within range of many UTs at any given time, many UTs are in contention to use an uplink to send upstream data to the satellite. Contention for the uplink may be managed by sending grants that allocate a portion of the uplink time and frequency resources to individual UTs. A UT serviced by the satellite uses information based on the grants to determine whether upstream data from a user device connected the UT should be accepted for future transmission promised to deliver specified quality of service to the user device. Acting as a distributed system, each UT may decide to approve upstream data based on one or more factors, such as source address, destination address, header flags, predicted radio availability, and so forth.

System for distributed management of satellite uplink communication

Satellites provide communication between devices such as user terminals (UTs) and ground stations that are in turn connected to other networks, such as the Internet. Latency for signals to and from the satellite can introduce delays due at least in part to propagation time. The latency adversely interacts with data transfers that result in responses from the UT. Downstream data to the UT is processed to determine if a response is expected. Header data is associated with the downstream data that is sent to the satellite. A resource scheduler onboard the satellite uses the header data to provide a prospective grant to the UT to send the expected response. The UT receives the downstream data, response data such as an acknowledgement is generated, and the response data is sent to the satellite using the prospective grant. The system substantially reduces the latency associated with responsive traffic and improves overall throughput.

Prospective uplink grant for satellite communications

A data aggregation system is described herein for accessing and viewing information about an entity stored in multiple data stores. The data aggregation system identifies an entry in a primary data store that contains information about an entity. The system receives a request to associate an entry in a secondary data store with the identified entry in the primary data store. Then, the system identifies information in the secondary data store that identifies the entry in the secondary data store and associates the identified information with the entry in the primary data store. When a user requests to view the entry in the primary data store, the system retrieves the information about the entry in the primary data store and uses the stored entry identifier to also retrieve the information about the entry from the secondary data store. Thus, the information remains in the data store in which it originated, but the data aggregation system provides a unified view.

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Redmond, WA, United States of America

Mohammad Mamunur Rashid