# US 2019/0174369 A1 · Radio communication system, base station apparatus, and control information transmission method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174369 A1 - Document ID: US20190174369A1 - Status: Published application - Kind: A1 - Application number: 16/269,145 - Filed: 2019-02-06 - Published: 2019-06-06 - Earliest claimed: 2016-08-31 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Tadato Tomikawa; Takayoshi Ode; Kimio WATANABE - Web page: https://patentgrep.com/patent/US20190174369A1 ## CPC - H04W 36/08: Reselecting an access point - H04W 36/12: Reselecting a serving backbone network switching or routing node - H04L 65/65: Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP] - H04W 36/0064: {of control information between different access points} - H04W 92/20: between access points - H04W 40/36: due to handover - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A radio communication system, a first application server includes a communicator configured to transmit to and receive from a terminal apparatus individual data via a first base station apparatus, the first base station apparatus includes a first controller configured to request to a second base station apparatus first control information regarding to a second application server connected to the second base station apparatus and second control information for the terminal apparatus to connect to the second base station apparatus, and a transmitter configured to transmit to the terminal apparatus the second control information notified from the second base station apparatus, at least, the second base station apparatus includes a second controller configured to notify the first and second control information to the first base station apparatus, the terminal apparatus receives at least the second control information from the first base station apparatus. ## Claims ### Claim 1 A radio communication system comprising: a first and second base station apparatuses; a first and second application servers; and a terminal apparatus, wherein the first application server includes: a communicator configured to transmit to and receive from the terminal apparatus individual data via the first base station apparatus, the first base station apparatus includes: a first controller configured to request to the second base station apparatus first control information regarding to the second application server connected to the second base station apparatus and second control information for the terminal apparatus to connect to the second base station apparatus, and a transmitter configured to transmit to the terminal apparatus the second control information notified from the second base station apparatus, at least, the second base station apparatus includes: a second controller configured to notify the first and second control information to the first base station apparatus, the terminal apparatus includes: a receiver configured to receive at least the second control information from the first base station apparatus. ### Claim 2 (depends on 1) The radio communication system according to claim 1, wherein the first control information includes, at least one of: connection information of the second application server in the radio communication system, and information regarding to a route or transmission delay between the second base station apparatus and the second application server. ### Claim 3 (depends on 1) The radio communication system according to claim 1, wherein the first controller is configured to previously or periodically collect the first control information. ### Claim 4 (depends on 1) The radio communication system according to claim 1, further comprising: a third base station apparatus, wherein the first controller is configured to change connection destination of the terminal apparatus from the second base station apparatus to the third base station apparatus based on the first control information. ### Claim 5 (depends on 1) The radio communication system according to claim 1, wherein the first controller is configured to change communication destination of the individual data from the first application server to the second application server, before changing connection destination of the terminal apparatus. ### Claim 6 (depends on 1) The radio communication system according to claim 1, further comprising: a third application server, wherein the second controller is configured to change communication destination of the individual data from the second application server to the third application server based on the first control information, after the terminal apparatus completed connection to the second base station apparatus. ### Claim 7 (depends on 1) The radio communication system according to claim 1, further comprising: a third controller configured to transmit to the second application server application state information including data amount or transmission time of the individual data transmitted from the first application server to the terminal apparatus. ### Claim 8 (depends on 2) The radio communication system according to claim 2, wherein the connection information of the second application server in the radio communication system indicates position of the second application server. ### Claim 9 (depends on 2) The radio communication system according to claim 2, wherein the information regarding to transmission delay indicates time until the terminal apparatus receives the individual data transmitted from the second application server. ### Claim 10 (depends on 2) The radio communication system according to claim 2, wherein the first control information includes information regarding to a providable service to the terminal apparatus by the second application server. ### Claim 11 (depends on 10) The radio communication system according to claim 10, wherein the information regarding to the providable service includes time until the terminal apparatus receives the service provided from the second application server. ### Claim 12 (depends on 1) The radio communication system according to claim 1, wherein the first controller is configured to transmit a first message included a request for the first control information to the second base station apparatus when the terminal apparatus change connection from the first base station apparatus to the second base station apparatus, and the second controller is configured to transmit a second message included the first control information to the first base station apparatus when the terminal apparatus change connection from the first base station apparatus to the second base station apparatus. ### Claim 13 (depends on 12) The radio communication system according to claim 12, wherein the first message is a Handover Request massage, and the second message is a Hanover Request Acknowledgement message . ### Claim 14 (depends on 12) The radio communication system according to claim 12, wherein the first controller is configured to insert the request for the first control information in a first information element transmitted the request for the first control information, and transmits a Handover Request message included the first information element to the second base station apparatus, and the second controller is configured to insert the first control information in a second information element transmitted the first control information, and a Handover Request Acknowledgement message included the second information element to the first base station apparatus. ### Claim 15 (depends on 1) The radio communication system according to claim 1, wherein the first controller is configured to insert a request for the first control information in a Data Chunk area of SCTP (Stream Control Transmission Protocol) and transmit the request for the first control information, and the second controller is configured to insert the first control information in the Data Chunk area of the SCTP and transmit the first control information. ### Claim 16 (depends on 1) The radio communication system according to claim 1, wherein the first controller is configured to insert a request for the first control information in a payload area of X2-AP (X2 Application Protocol) and transmit the request for the first control information, and the second controller is configured to insert the first control information in the payload area of the X2-AP and transmit the first control information. ### Claim 17 (depends on 4) The radio communication system according to claim 4, further comprising: a third application server, wherein the first controller is configured to change connection destination of the terminal apparatus from the second base station apparatus to the third base station apparatus based on the first control information, third control information regarding to the first application server, and fourth control information regarding the third application server connected to the third base station apparatus. ### Claim 18 (depends on 6) The radio communication system according to claim 6, wherein the second controller is configured to change communication destination of the individual data from the second application server to the third application server based on the first control information, third control information regarding to the first application server, and fifth control information regarding to the fourth application server connected to the second base station apparatus. ### Claim 19 (depends on 7) The radio communication system according to claim 7, wherein the third controller is configured to acquire the data amount or the transmission time from RTCP (Real-time Transmission Control Protocol) information included in an RTP (Real-time Transport Protocol) packet received from another apparatus connected via a CDN (Content Delivery Network). ### Claim 20 A base station apparatus connected to a first application server, the base station apparatus comprising: a controller configured to request to another base station apparatus first control information regarding to a second application server connected to the other base station apparatus and second control information for a terminal apparatus to connect the other base station apparatus; and a transmitter configured to transmit to the terminal apparatus the second control information notified from the other base station apparatus, at least. ### Claim 21 A base station apparatus connected to an application server, the base station apparatus comprising: a receiver configured to receive a request for first control information regarding to the application server and second control information for a terminal apparatus to connect to the base station apparatus, transmitted from another base station apparatus; and a controller configured to notify the first and second control information to the other base station apparatus. ### Claim 22 A control information transmission method in a radio communication system including a first and second base station apparatuses, a first and second application servers, and a terminal apparatus, the method comprising: transmitting to and receiving from the terminal apparatus an individual data via the first base station apparatus by the first application server; requesting to the second base station apparatus first control information regarding to the second application server connected to the second base station apparatus and second control information for the terminal apparatus to connect to the second base station apparatus, by the first base station apparatus; transmitting to the terminal apparatus the second control information notified from the second base station apparatus, at least, by the first base station apparatus; notifying the first and second control information to the first base station apparatus, by the second base station apparatus; and receiving the second control information from the first base station apparatus at least, by the terminal apparatus.