# US 2013/0157656 A1 · Device-To-Device Discovery and Operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157656 A1 - Document ID: US20130157656A1 - Status: Published application - Kind: A1 - Application number: 13/334,486 - Filed: 2011-12-22 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Renesas Mobile Corporation - Inventors: Chun Yan Gao; Samuli Turtinen; Sami-Jukka Hakola; Timo K. Koskela; Hai Ming Wang - Web page: https://patentgrep.com/patent/US20130157656A1 ## CPC - H04W 76/14: Direct-mode setup - H04W 4/50: Service provisioning or reconfiguring - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The specification and drawings present a method, apparatus and software related product (e.g., a computer readable memory) for improving device discovery and D2D operation, e.g., in LTE wireless systems, by using control signaling provided by a wireless network (e.g., by an eNB). The discovery channel/channels which conveys discovery signal/signals are configured by a network (e.g., by the eNB) and are mapped to control channel/channels (e.g., one-to-one). After sending/receiving the discovery signal/signals, the D2D devices are monitoring control channel/channels to get current information for establishing the D2D communication among these D2D devices, the current information may include a resource allocation for the D2D communication and a device list of candidates for establishing the D2D communication. ## Claims ### Claim 1 A method comprising: transmitting or receiving by a first device a device-to-device discovery signal on a discovery channel; mapping the discovery channel to one control channel; and monitoring the one control channel for information comprising a resource allocation for device-to-device communications. ### Claim 2 (depends on 1) The method of claim 1, further comprising: establishing the device-to-device communications with a second device based on the allocated resource. ### Claim 3 (depends on 1) The method of claim 1, wherein the information comprises a list of devices which are candidates for establishing the device-to-device communications. ### Claim 4 (depends on 3) The method of claim 3, wherein the device-to-device discovery signal is transmitted by the first device, and establishing of the device-to-device communications among the candidates is coordinated by the first device. ### Claim 5 (depends on 4) The method of claim 4, wherein the first device is identified by being in a predetermined position in the list or by a predefined indication in the device-to-device discovery signal. ### Claim 6 (depends on 3) The method of claim 3, wherein the candidates consist of devices which received the device-to-device discovery signal and are closer than a predefined distance to the first device. ### Claim 7 (depends on 1) The method of claim 1, wherein the first device is configured by a cellular network for transmitting on the discovery channel and the second device is configured by the cellular network for receiving on the discovery channel. ### Claim 8 (depends on 1) The method of claim 1, wherein the device-to-device discovery signal is received by the first device, and the method further comprises: sending by the first device to a network access node an uplink signal comprising an indication that the device-to-device discovery signal was received. ### Claim 9 (depends on 8) The method of claim 8, wherein the uplink signal is sent on a physical uplink control channel or a physical uplink shared channel. ### Claim 10 (depends on 8) The method of claim 8, wherein before sending the uplink signal, the method further comprises: receiving by the first device at least one further device-to-device discovery signal on at least one further discovery channel, wherein the uplink signal comprises a further indication of receiving the at least one further device-to-device discovery signal. ### Claim 11 A method comprising: configuring by a network element a plurality of discovery channels, each discovery channel of the plurality of the discovery channels being mapped to one control channel; receiving by the network element an indication from a device about detecting a device-to-device discovery signal on one discovery channel of the plurality of discovery channels; and transmitting by the network element information on a control channel mapped from the one discovery channel, the information comprising a resource allocation for device-to-device communications. ### Claim 12 (depends on 11) The method of claim 11, wherein the transmitting the information on the control channel is periodic. ### Claim 13 (depends on 12) The method of claim 12, wherein the transmitting the information on the control channel has a period which is different from a period of the device-to-device discovery signal. ### Claim 14 (depends on 11) The method of claim 11, wherein the information comprises a list of devices which are candidates for establishing the device-to-device communications. ### Claim 15 An apparatus comprising: at least one processor and a memory storing a set of computer instructions, in which the processor and the memory storing the computer instructions are configured to cause the apparatus to: transmit or receiving by a first device a device-to-device discovery signal on a discovery channel; map the discovery channel to one control channel; and monitor the one control channel for information comprising a resource allocation for device-to-device communications. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the computer instructions are configured to further cause the apparatus to: establish the device-to-device communications with a second device based on the allocated resource. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the information comprises a list of devices which are candidates for establishing the device-to-device communications. ### Claim at position 18 18-19. (canceled) ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the device-to-device discovery signal is received by the apparatus, and the computer instructions are configured to further cause the apparatus to: sending by apparatus to a network access node an uplink signal comprising an indication that the device-to-device discovery signal was received. ### Claim 21 (canceled) ### Claim 22 An apparatus comprising: at least one processor and a memory storing a set of computer instructions, in which the processor and the memory storing the computer instructions are configured to cause the apparatus to: configure a plurality of discovery channels, each discovery channel of the plurality of the discovery channels being mapped to one control channel; receive an indication from a device about detecting a device-to-device discovery signal on one discovery channel of the plurality of discovery channels; and transmit information on a control channel mapped from the one discovery channel, the information comprising a resource allocation for device-to-device communications. ### Claim at position 22 23-24. (canceled) ### Claim 25 (depends on 22) The apparatus of claim 22, wherein the information comprises a list of devices which are candidates for establishing the device-to-device communications. ### Claim at position 24 26-29. (canceled)