IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0404200
(2012-02-24)
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등록번호 |
US-8588181
(2013-11-19)
|
우선권정보 |
GB-0616682.1 (2006-08-22); GB-0619524.2 (2006-10-03) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
McGinn Intellectual Property Law Group PLLC
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
8 |
초록
▼
A communication method performed in a mobile communication device of a telecommunication system includes receiving Service Data Units, SDUs, for transmission to a source node of the telecommunication system, storing a copy of the SDUs in an SDU management buffer, passing the SDUs to a concatenation
A communication method performed in a mobile communication device of a telecommunication system includes receiving Service Data Units, SDUs, for transmission to a source node of the telecommunication system, storing a copy of the SDUs in an SDU management buffer, passing the SDUs to a concatenation and segmentation unit to generate Protocol Data Units, PDUs, storing the PDUs in a transmit buffer for transmission to the source node, sending a feedback message to the SDU management buffer identifying an SDU that can be removed from the SDU management buffer, receiving a handover command from the source node after receiving the status report, and after completing handover to a target node, using the received status report to control which SDUs are passed to the concatenation and segmentation unit to form PDUs for transmission to the target node.
대표청구항
▼
1. A communication method performed in a mobile communication device of a telecommunication system, the method comprising: receiving Service Data Units, SDUs, for transmission to a source node of the telecommunication system;storing a copy of the SDUs in an SDU management buffer;passing the SDUs to
1. A communication method performed in a mobile communication device of a telecommunication system, the method comprising: receiving Service Data Units, SDUs, for transmission to a source node of the telecommunication system;storing a copy of the SDUs in an SDU management buffer;passing the SDUs to a concatenation and segmentation unit to generate Protocol Data Units, PDUs;storing the PDUs in a transmit buffer for transmission to the source node;sending a feedback message to the SDU management buffer identifying an SDU that can be removed from the SDU management buffer when, for Unacknowledge Mode, UM, data, the PDUs corresponding to that SDU have been forwarded from the transmission buffer or when, for Acknowledge Mode, AM, data, receipt of the PDUs corresponding to that SDU have been acknowledged by the source node;in response to the receipt of the feedback message, allowing removal of the identified SDU from the SDU management buffer;receiving a status report from the source node;receiving a handover command from the source node after receiving the status report; andafter completing handover to a target node, using the received status report to control which SDUs are passed to the concatenation and segmentation unit to form PDUs for transmission to the target node. 2. A method according to claim 1, further comprising receiving downlink user data packets from the source node and wherein in response to receiving said handover command, sending a status report to the source node indicating the downlink user data packets that have been received by the mobile communication device and then stopping forwarding of PDUs from the transmission buffer to the source node. 3. A method according to claim 1, wherein a Radio Resource Control, RRC, layer in the mobile communication device receives said handover command from the source node and in response instructs an Outer ARQ layer in the mobile communication device to stop an uplink user data transmission. 4. A method according to claim 3, wherein said RRC layer of said mobile communication device instructs said ARQ layer of the mobile communication device to send said status report to the ARQ layer of the source node before instructing the stopping of the uplink user data transmission. 5. A mobile communication device, comprising: a receiver operable to receive Service Data Units, SDUs, for transmission to a source node of the telecommunication system;an SDU management buffer for storing a copy of the SDUs;a concatenation and segmentation unit for generating Protocol Data Units, PDUs from the SDUs;a transmit buffer for storing the PDUs prior to transmission to the source node;a transmitter operable to send a feedback message to the SDU management buffer identifying an SDU that can be removed from the SDU management buffer when, for Unacknowledge Mode, UM, data, the PDUs corresponding to that SDU have been forwarded from the transmission buffer or when, for Acknowledge Mode, AM, data, receipt of the PDUs corresponding to that SDU have been acknowledged by the source node;a controller operable, in response to the receipt of the feedback message, to allow removal of the identified SDU from the SDU management buffer;a receiver operable to receive a status report from the source node;a receiver operable to receive a handover command from the source node after receiving the status report; anda controller operable to use, after completing handover to a target node, the received status report to control which SDUs are passed to the concatenation and segmentation unit to form PDUs for transmission to the target node. 6. A communication method performed in a source node of a telecommunication system, the method comprising: receiving Service Data Units, SDUs, for transmission to a mobile communication device;storing a copy of the SDUs in an SDU management buffer;passing the SDUs to a concatenation and segmentation unit to generate Protocol Data Units, PDUs;storing the PDUs in a transmit buffer for transmission to the mobile communication device;sending a feedback message to the SDU management buffer identifying an SDU that can be removed from the SDU management buffer when, for Unacknowledge Mode, UM, data, the PDUs corresponding to that SDU have been forwarded from the transmission buffer or when, for Acknowledge Mode, AM, data, receipt of the PDUs corresponding to that SDU have been acknowledged by the mobile communication device;in response to the receipt of the feedback message, allowing removal of the identified SDU from the SDU management buffer; andduring handover of the mobile communication device from the source node to a target node, selectively forwarding SDUs for the mobile communication device to the target node in dependence upon an RLC status report or HARQ feedback information. 7. A source node of a telecommunication system, the source node comprising: a receiver operable to receive Service Data Units, SDUs, for transmission to a mobile communication device;an SDU management buffer for storing a copy of the SDUs;a concatenation and segmentation unit for generating Protocol Data Units, PDUs;a transmit buffer for storing the PDUs for transmission to the mobile communication device;a transmitter operable to send a feedback message to the SDU management buffer identifying an SDU that can be removed from the SDU management buffer when, for Unacknowledge Mode, UM, data, the PDUs corresponding to that SDU have been forwarded from the transmission buffer or when, for Acknowledge Mode, AM, data, receipt of the PDUs corresponding to that SDU have been acknowledged by the mobile communication device;a controller operable, in response to the receipt of the feedback message, to allow removal of the identified SDU from the SDU management buffer; anda transmitter operable to selectively forward, during handover of the mobile communication device from the source node to a target node, SDUs for the mobile communication device to the target node in dependence upon an RLC status report or HARQ feedback information. 8. A method of facilitating a handover of a mobile communication device from a source node to a target node, the method comprising: at the source node, in response to receiving a handover response from the target node, sending a status packet to the mobile communication device, and after sending the status packet, stopping a transmission of downlink user data from the source node to the mobile communication device;at the mobile communication device, in response to receiving a handover command from the source node:sending a status packet to the source node, and after sending the status packet stopping a transmission of uplink user data from the mobile communication device to the source node;at the source node, in response to receiving the status packet from the mobile communication device;forwarding user data packets to the target node after the source node stops forwarding the user data packets to the mobile communication device; andusing information contained in the status packet to control the forwarding of the user data packets from the source node to the target node by selecting the user data packets held by the source node to be forwarded from the source node to the target node. 9. A method according to claim 8, further comprising, at the source node, continuing to receive the uplink user data packets from the mobile communication device after stopping the transmission of the downlink user data from the source node to the mobile communication device. 10. A method according to claim 8, wherein said source node transmits said handover command to said mobile communication device after stopping the transmission of said downlink user data. 11. A method according to claim 8, wherein said source node comprises a base station. 12. A method according to claim 8, wherein said stopping is performed such that no downlink user data packets are transmitted to the mobile communication device after sending said status packet. 13. A source node of a telecommunication system, the source node comprising: a receiver operable to receive uplink user data packets from a mobile communication device;a transmitter operable to transmit downlink user data packets to the mobile communication device;a receiver operable to receive a handover response indicating handover of the mobile communication device from the source node to a target node;a controller operable to generate, in response to receipt of said handover response, a status packet indicating uplink data packets received from the mobile communication device;a transmitter operable to send the generated status packet to the mobile communication device;a controller operable to stop the transmission of the downlink user data from the source node to the mobile communication device after sending said status packet;a receiver operable to receive a status packet from the mobile communication device;a transmitter operable to forward user data packets to the target node after the source node stops forwarding the user data packets to the mobile communication device; anda controller arranged to use information contained in the received status packet to control the forwarding of the user data packets from the source node to the target node by selecting the user data packets held by the source node to be forwarded from the source node to the target node. 14. A method of facilitating handover of a mobile communication device from a source node to a target node, the method being performed in the source node and comprising: stopping a transmission of downlink user data from the source node to the mobile communication device;sending a status packet to the mobile communication device indicating uplink user data packets received from the mobile communication device prior to stopping said transmission;receiving a status packet from the mobile communication device; andforwarding a plurality of user data packets to the target node in dependence upon information contained in the received status packet. 15. A method according to claim 14, performed in response to receiving a handover response from the target node. 16. A method according to claim 14, further comprising transmitting a handover command to said mobile communication device after stopping the transmission of said downlink user data. 17. A method according to claim 14, wherein said receiving said status packet happens after said stopping the transmission of downlink user data. 18. A method according to claim 14, wherein the source node comprises a base station. 19. A source node of a telecommunication system, the source node comprising: a controller operable to stop a transmission of downlink user data from the source node to a mobile communication device;a transmitter operable to send a status packet to the mobile communication device indicating uplink user data packets received from the mobile communication device prior to stopping said transmission;a receiver operable to receive a handover response from a target node indicating a handover of the mobile communication device from the source node to the target node;a controller operable to stop, in response to receiving said handover response, transmission of said downlink user data from the source node to the mobile communication device;a transmitter operable to transmit a handover command to said mobile communication device after stopping the transmission of said downlink user data;a receiver operable to receive a status packet from the mobile communication device; anda transmitter operable to forward user data packets to the target node in dependence upon information contained in the received status packet.
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