MOBILE COMMUNICATION METHOD AND EXCHANGE
First Claim
1. A mobile communication method in which, during handover of a mobile station, an exchange including a first protocol function to function as a first protocol and a second protocol function to function as a second protocol being a lower layer than the first protocol transmits a second protocol message containing a first protocol message to radio base stations each including a second protocol function to function as the second protocol, and each of the radio base stations transmits the first protocol message to the mobile station including a first protocol function to terminate the first protocol, the mobile communication method comprising the steps of:
- transmitting, from the first protocol function of the exchange to the second protocol function of the exchange, a first protocol layer message;
transmitting, from the second protocol function of the exchange to a handover source radio base station, the second protocol message containing the first protocol message;
transmitting, from the second protocol function of the exchange to the first protocol function of the exchange, a retransmission request for the first protocol layer message, when receiving a notification, which indicates completion of the handover of the mobile station, from a handover target radio base station, after receiving a second protocol response message, which indicates that transfer of the first protocol message to the mobile station through a radio interface has failed, from the handover source radio base station;
retransmitting, from the first protocol function of the exchange to the second protocol function of the exchange, the first protocol layer message, in response to the retransmission request; and
retransmitting, from the second protocol function to the handover target radio base station, the second protocol message containing the first protocol message.
1 Assignment
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Accused Products
Abstract
A mobile communication method according to the present invention includes the steps of: transmitting, from a NAS function to an S1-AP function, a NAS-PDU; transmitting, from the S1-AP function to the NAS function, a retransmission request for the NAS-PDU, when receiving a notification, which indicates completion of a handover of a mobile station (UE), from a handover target radio base station (eNB), after receiving an S1-AP response message, *which indicates that transfer of the NAS-PDU to the mobile station (UE) through a radio interface has failed, from the handover source radio base station (eNB); and retransmitting, from the NAS function to the S1-AP function, the NAS-PDU, in response to the retransmission request.
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Citations
12 Claims
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1. A mobile communication method in which, during handover of a mobile station, an exchange including a first protocol function to function as a first protocol and a second protocol function to function as a second protocol being a lower layer than the first protocol transmits a second protocol message containing a first protocol message to radio base stations each including a second protocol function to function as the second protocol, and each of the radio base stations transmits the first protocol message to the mobile station including a first protocol function to terminate the first protocol, the mobile communication method comprising the steps of:
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transmitting, from the first protocol function of the exchange to the second protocol function of the exchange, a first protocol layer message; transmitting, from the second protocol function of the exchange to a handover source radio base station, the second protocol message containing the first protocol message; transmitting, from the second protocol function of the exchange to the first protocol function of the exchange, a retransmission request for the first protocol layer message, when receiving a notification, which indicates completion of the handover of the mobile station, from a handover target radio base station, after receiving a second protocol response message, which indicates that transfer of the first protocol message to the mobile station through a radio interface has failed, from the handover source radio base station; retransmitting, from the first protocol function of the exchange to the second protocol function of the exchange, the first protocol layer message, in response to the retransmission request; and retransmitting, from the second protocol function to the handover target radio base station, the second protocol message containing the first protocol message. - View Dependent Claims (2)
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3. A mobile communication method in which, during handover of a mobile station, an exchange including a first protocol function to function as a first protocol and a second protocol function to function as a second protocol being a lower layer than the first protocol transmits a second protocol message containing a first protocol message to radio base stations each including a second protocol function to function as the second protocol, and each of the radio base stations transmits the first protocol message to the mobile station including a first protocol function to terminate the first protocol, the mobile communication method comprising the steps of:
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transmitting, from the first protocol function of the exchange to the second protocol function of the exchange, a first protocol layer message; transmitting, from the second protocol function of the exchange to a handover source radio base station, the second protocol message containing the first protocol message; and retransmitting, from the second protocol function of the exchange to a handover target radio base station, the second protocol message containing the first protocol message, when receiving a notification, which indicates completion of the handover of the mobile station, from the handover target radio base station, after receiving a second protocol response message, which indicates that transfer of the first protocol message to the mobile station through a radio interface has failed, from the handover source radio base station. - View Dependent Claims (4, 5, 6, 7)
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8. An exchange to be used in a mobile communication system in which, during handover of a mobile station, the exchange including a first protocol function to function as a first protocol and a second protocol function to function as a second protocol being a lower layer than the first protocol transmits a second protocol message containing a first protocol message to radio base stations each including a second protocol function to function as the second protocol, and each of the radio base stations transmits the first protocol message to the mobile station including a first protocol function to terminate the first protocol, wherein
the first protocol function of the exchange is configured: -
to transmit a first protocol layer message to the second protocol function of the exchange, and to store the first protocol layer message in a buffer; and to retransmit the first protocol layer message stored in the buffer to the second protocol function of the exchange, in response to a retransmission request for the first protocol layer message received from the second protocol function of the exchange; and the second protocol function of the exchange is configured; to transmit a second protocol message containing the first protocol message received from the first protocol function of the exchange to a handover source radio base station; and to transmit the retransmission request to the first protocol function of the exchange, when receiving a notification, which indicates the completion of the handover of the mobile station, from a handover target radio base station, after receiving a second protocol response message, which indicates that transfer of the first protocol message to the mobile station through a radio interface has failed, from the handover source radio base station; and to retransmit the second protocol message containing the first protocol message received from the first protocol function of the exchange to the handover target radio base station. - View Dependent Claims (9)
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10. An exchange to be used in a mobile communication method in which, during handover of a mobile station, the exchange including a first protocol function to function as a first protocol and a second protocol function to function as a second protocol being a lower layer than the first protocol transmits a second protocol message containing a first protocol message to radio base stations each including a second protocol function to function as the second protocol, and each of the radio base station transmits the first protocol message to the mobile station including a first protocol function to terminate the first protocol, wherein
the first protocol function of the exchange is configured to transmit a first protocol layer message to the second protocol function of the exchange; - and
the second protocol function of the exchange is configured; to transmit a second protocol message containing the first protocol message received from the first protocol function of the exchange to a handover source radio base station, and to store the second protocol message in a buffer; and to retransmit the second protocol message stored in the buffer to a handover target radio base station, when receiving a notification, which indicates completion of the handover of the mobile station, from the handover target radio base station, after receiving a second protocol response message, which indicates that transfer of the first protocol message to the mobile station through a radio interface has failed, from the handover source radio base station. - View Dependent Claims (11, 12)
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Specification