Synchronization for device-to-device communication
First Claim
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1. A method comprising:
- synchronizing, by a first mobile station in a wireless network, with an access node;
receiving a connection message from the access node, the connection message comprising timing advance parameters of mobile stations in a device-to-device group and a maximum device-to-device transmission power level allowed, the device-to-device group comprising at least the first mobile station and a second mobile station;
repeatedly sending a synchronization message to the second mobile station until receiving a synchronization acknowledgement from the second mobile station, the synchronization message being sent with an initial transmission power level based at least partly on a difference between timing advance parameters of the first mobile station and the second mobile station, and increasing transmission power levels to the maximum device-to-device transmission power comprised in the connection message; and
receiving the synchronization acknowledgment message from the second mobile station,sending a transmission power message to the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message,wherein the synchronizing with the access node comprises;
sending a preamble to the access node; and
receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant.
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Accused Products
Abstract
Various example embodiments are disclosed. According to one example embodiment, a method may include synchronizing, by an access node in a wireless network, with a first mobile station, synchronizing with a second mobile station, compiling a device-to-device group, the device-to-device group including at least the first mobile station and the second mobile station, sending a first connection message to the first mobile station, the first connection message including timing advance parameters of both the first mobile station and the second mobile station, and sending a second connection message to the second mobile station.
34 Citations
8 Claims
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1. A method comprising:
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synchronizing, by a first mobile station in a wireless network, with an access node; receiving a connection message from the access node, the connection message comprising timing advance parameters of mobile stations in a device-to-device group and a maximum device-to-device transmission power level allowed, the device-to-device group comprising at least the first mobile station and a second mobile station; repeatedly sending a synchronization message to the second mobile station until receiving a synchronization acknowledgement from the second mobile station, the synchronization message being sent with an initial transmission power level based at least partly on a difference between timing advance parameters of the first mobile station and the second mobile station, and increasing transmission power levels to the maximum device-to-device transmission power comprised in the connection message; and receiving the synchronization acknowledgment message from the second mobile station, sending a transmission power message to the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message, wherein the synchronizing with the access node comprises; sending a preamble to the access node; and receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant. - View Dependent Claims (2, 3)
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4. A method comprising:
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synchronizing, by a first mobile station in a wireless network, with an access node; receiving a connection message from the access node, the connection message comprising timing advance parameters of mobile stations in a device-to-device group and a maximum device-to-device transmission power level allowed, the device-to-device group comprising at least the first mobile station and a second mobile station; receiving a synchronization message from a second mobile station; sending a synchronization acknowledgment message to the second mobile station; and receiving a transmission power message from the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message, wherein the transmission power level is increased to the maximum device-to-device transmission power level comprised in the connection message, wherein the synchronizing with the access node comprises; sending a preamble to the access node; and receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant.
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5. An apparatus comprising:
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at least one processor; and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to; synchronize with an access node; receive a connection message from the access node, the connection message comprising timing advance parameters of mobile stations in a device-to-device group and a maximum device-to-device transmission power level allowed, the device-to-device group comprising at least the first mobile station and a second mobile station; repeatedly send synchronization messages to the second mobile station until a synchronization acknowledgment message is received from the second mobile station, the synchronization messages being sent with an initial transmission power level based at least partly on a difference between timing advance parameters of the first mobile station and the second mobile station, and increasing transmission power levels to the maximum device-to-device transmission power comprised in the connection message; receive the synchronization acknowledgment message from the second mobile station; and send a transmission power message to the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message, wherein the synchronizing with the access node comprises; sending a preamble to the access node; and receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant. - View Dependent Claims (6)
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7. An apparatus comprising:
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at least one processor; and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to; synchronize with an access node; receive a synchronization message from a second mobile station; send a synchronization acknowledgment message to the second mobile station; and receive a transmission power message from the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message, wherein the synchronizing with the access node comprises; sending a preamble to the access node; and receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant.
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8. A computer program product for device-to-device communication between mobile stations, the computer program product being tangibly embodied on a non-transitory computer storage medium and comprising executable code that, when executed, is configured to cause a first mobile station to:
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synchronize with an access node; receive a connection message from the access node, the connection message comprising timing advance parameters of mobile stations in a device-to-device group and a maximum device-to-device transmission power level allowed, the device-to-device group comprising at least the first mobile station and a second mobile station; repeatedly send synchronization messages to the second mobile station until receiving a synchronization acknowledgment message from the second mobile station, the synchronization messages being sent with an initial transmission power level based at least partly on a difference between timing advance parameters of the first mobile station and the second mobile station, and increasing transmission power levels to the maximum device-to-device transmission power comprised in the connection message; receive the synchronization acknowledgment message from the second mobile station; and send a transmission power message to the second mobile station, the transmission power message comprising a transmission power level of the synchronization message corresponding to the received synchronization acknowledgment message, wherein the synchronizing with the access node comprises; sending a preamble to the access node; and receiving a response from the access node, the response comprising timing alignment information and an initial uplink grant.
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Specification