# US 2009/0268653 A1 · Wireless Communication System, Wireless Communication Apparatus, Wireless Communication Method, and Program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0268653 A1 - Document ID: US20090268653A1 - Status: Published application - Kind: A1 - Application number: 12/430,457 - Filed: 2009-04-27 - Published: 2009-10-29 - Earliest claimed: 2008-04-28 - Assignees: Sony Corporation - Inventors: Takeshi ITAGAKI; Katsutoshi Itoh - Web page: https://patentgrep.com/patent/US20090268653A1 ## CPC - H04W 76/14: Direct-mode setup - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A wireless communication apparatus according to the invention includes a first wireless communication apparatus (STA1) which transmits search data to a second wireless communication apparatus (STA2) connected through an access point in a wireless communication network and determines whether a direct link setup to the second wireless communication apparatus (STA2) is possible based on search response data returned from the second wireless communication apparatus (STA2), and the second wireless communication apparatus (STA2) which receives the search data and transmits the search response data to the first wireless communication apparatus (STA1) when the second wireless communication apparatus (STA2) is compliant with the direct link setup. ## Claims ### Claim 1 A wireless communication system comprising: a first wireless communication apparatus which transmits search data to a second wireless communication apparatus connected through an access point in a wireless communication network and determines whether a direct link setup to the second wireless communication apparatus is possible based on search response data returned from the second wireless communication apparatus; and the second wireless communication apparatus which receives the search data and transmits the search response data to the first wireless communication apparatus when the second wireless communication apparatus is compliant with the direct link setup. ### Claim 2 (depends on 1) The wireless communication system according to claim 1, wherein the search response data includes at least one of a BSSID to which the second wireless communication apparatus belongs, an ESSID, a power saving state, a channel number, the presence/absence of a power saving communication function at a direct link, and the presence/absence of a dynamic channel changing function at the direct link. ### Claim 3 (depends on 1) The wireless communication system according to claim 1, wherein the first wireless communication apparatus includes a registration control unit which determines that the second wireless communication apparatus is a communicatee to which a direct link can be set up when the BSSID included in the search response data is matched with a BSSID of its own apparatus, and which registers the second wireless communication apparatus in a table. ### Claim 4 (depends on 1) The wireless communication system according to claim 1, wherein the first wireless communication apparatus includes a registration control unit which determines that the second wireless communication apparatus as the communicatee to which a direct link can be set up when the BSSID included in the search response data is not matched with a BSSID of its own apparatus, when the ESSID included in the search response data is matched with the ESSID of its own apparatus, and when a channel number representing a frequency band used by the second wireless communication apparatus is matched with a channel number of its own apparatus and which registers the second wireless communication apparatus in a table. ### Claim 5 (depends on 1) The wireless communication system according to claim 1, wherein the first wireless communication apparatus includes a registration control unit which determines that the second wireless communication apparatus is a communicatee to which a direct link can set up when the BSSID included in the search response data is not matched with a BSSID of its own apparatus, when the ESSID included in the search response data is matched with the ESSID of its own apparatus, when a channel number representing a frequency band used by the second wireless communication apparatus is not matched with a channel number of its own apparatus, and when the first or second wireless communication apparatus has a function of dynamically changing channels during the direct link. ### Claim 6 (depends on 1) The wireless communication system according to claim 1, wherein the first wireless communication apparatus performs transmission of the search data in synchronization with a service search protocol of a higher-level layer. ### Claim 7 (depends on 1) The wireless communication system according to claim 1, wherein the first wireless communication apparatus transmits the search data based on a multi-cast address of a service search/device search protocol packet of a higher-level layer. ### Claim 8 (depends on 7) The wireless communication system according to claim 7, wherein the second wireless communication apparatus transmits the search response data to the first wireless communication apparatus in a uni-cast manner. ### Claim 9 A wireless communication apparatus comprising: a transmitting unit which transmits, to another apparatus connected through an access point in a wireless communication network, search data which searches for whether the apparatus is compliant with a direct link setup; a receiving unit which receives search response data from the other apparatus which receives the search data; and a determining unit which determines whether a direct link setup to the second wireless communication apparatus is possible based on the search response data. ### Claim 10 A wireless communication method comprising the steps of: transmitting, to another apparatus connected through an access point in a wireless communication network, search data which searches for whether the apparatus is compliant with a direct link setup; receiving search response data from the other apparatus which receives the search data; and determining whether a direct link setup to the other communication apparatus is possible based on the search response data. ### Claim 11 A program to cause a computer to function as: a unit transmitting, to another apparatus connected through an access point in a wireless communication network, search data which searches for whether the apparatus is compliant with a direct link setup; a unit receiving search response data from the other apparatus which receives the search data; and a unit determining whether a direct link setup to the other apparatus is possible based on the search response data.