# US 2016/0366702 A1 · Wireless communication terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0366702 A1 - Document ID: US20160366702A1 - Status: Published application - Kind: A1 - Application number: 15/119,020 - Filed: 2014-08-14 - Published: 2016-12-15 - Earliest claimed: 2014-02-14 - Assignees: NEC Communication Systems, Ltd. - Applicants: NEC Communication Systems, Ltd. - Inventors: Yuki BABA; Akira MATSUMOTO; Peng SHAO - Web page: https://patentgrep.com/patent/US20160366702A1 ## CPC - H04W 74/0825: {with collision detection} - H04L 12/413: with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD] - 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 wireless communication terminal has: a wireless module part which transmits a radio frame signal; a transmission loss information detection part which detects transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part which detects collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part which controls a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information. ## Claims ### Claim 1 A wireless communication terminal comprising: a wireless module part configured to transmit a radio frame signal; a transmission loss information detection part configured to detect transmission loss information, the transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part configured to detect collision information, the collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part configured to control a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information. ### Claim 2 (depends on 1) The wireless communication terminal according to claim 1, wherein: the collision information detection part is configured to detect the collision information including collision presence or absence information, the collision presence or absence information representing presence or absence of collision between the radio frame signal transmitted by the radio module part and another radio frame signal; and the transmission control part is configured to control the transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information including the collision presence or absence information. ### Claim 3 (depends on 2) The wireless communication terminal according to claim 2, wherein: the wireless module part is configured to transmit the radio frame signal at one transmission rate of a plurality of transmission rates; and the transmission control part is configured to control the transmission rate used when the wireless module part transmits the radio frame signal, on a basis of the transmission loss information and the collision information including the collision presence or absence information. ### Claim at position 4 -15. (canceled) ### Claim 16 (depends on 2) The wireless communication terminal according to claim 2, wherein: the transmission control part is configured to increment a transmission failure counter in a case where transmission of the radio frame signal by the wireless module part has failed and there is not collision between the radio frame signal and another radio frame signal, and change the transmission rate to a lower rate in a case where the transmission failure counter exceeds a given transmission failure threshold. ### Claim 17 (depends on 2) The wireless communication terminal according to claim 2, wherein: the wireless module part is configured to execute a retransmission process under control by the transmission control part, the retransmission process being transmitting a radio frame signal with same contents again; and the transmission control part is configured to control the retransmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information including the collision presence or absence information. ### Claim 18 (depends on 17) The wireless communication terminal according to claim 17, wherein: the transmission control part is configured to control the wireless module part to execute the retransmission process in a case where transmission of the radio frame signal by the wireless module part has failed and there is collision between the radio frame signal and another radio frame signal. ### Claim 19 (depends on 2) The wireless communication terminal according to claim 2, wherein: the wireless module part is configured to execute a multirate retry process under control by the transmission control part, the multirate retry process being decreasing a transmission rate and executing the retransmission process again in a case where the retransmission process has failed a predetermined number of times; and the transmission control part is configured to control the multirate retry process executed by the wireless module part, on a basis of the transmission loss information and the collision information including the collision presence or absence information. ### Claim 20 (depends on 1) The wireless communication terminal according to claim 1, wherein: the collision information detection part is configured to detect the collision information including collision status information, the collision status information representing a collision status, the collision status being a collision pattern of the radio frame signal and another radio frame signal; and the transmission control part is configured to control the transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information including the collision status information. ### Claim 21 (depends on 20) The wireless communication terminal according to claim 20, wherein: the wireless module part is configured to transmit the radio frame signal at one transmission rate of a plurality of transmission rates; and the transmission control part is configured to change the transmission rate to a higher rate in a case where the collision has occurred and a collision status at a time of occurrence of the collision is a transmission-in-transmission collision occurrence status that collision has occurred because another radio frame signal is transmitted during transmission of the radio frame signal. ### Claim 22 (depends on 20) The wireless communication terminal according to claim 20, wherein: the transmission control part is configured to control the wireless module part to execute the retransmission process in a case where the collision has occurred and a collision status at a time of occurrence of the collision is not a transmission-in-transmission collision occurrence status that collision has occurred because another radio frame signal is transmitted during transmission of the radio frame signal. ### Claim 23 (depends on 1) The wireless communication terminal according to claim 1, wherein: the transmission control part is configured to acquire a traffic amount and, in consideration of the acquired traffic amount, control the transmission process executed by the wireless module part, the traffic amount being an amount of data flowing on a channel. ### Claim 24 (depends on 1) The wireless communication terminal according to claim 1, wherein: the collision information detection part is configured to detect the collision information including collision status information, the collision status information representing a collision status, the collision status being a collision pattern of the radio frame signal and another radio frame signal; and the transmission control part is configured to control a parameter corresponding to the collision status on a basis of the transmission loss information and the collision information including the collision status information, the parameter being used when the wireless module part executes the transmission process. ### Claim 25 (depends on 24) The wireless communication terminal according to claim 24, wherein: the collision information detection part is configured to detect a simultaneous-transmission collision occurrence status as the collision status represented by the collision status information, the simultaneous-transmission collision occurrence status being a status that collision has occurred because the radio frame signal from the wireless module part and another radio frame signal are simultaneously transmitted; and the transmission control part is configured to control a backoff time parameter, the backoff time parameter being a parameter having effect on the simultaneous-transmission collision occurrence status, the backoff time parameter being a transmission standby time selected at random. ### Claim 26 (depends on 24) The wireless communication terminal according to claim 24, wherein: the collision information detection part is configured to detect a transmission-in-transmission collision occurrence status as the collision status represented by the collision status information, the transmission-in-transmission collision occurrence status being a status that collision has occurred because another radio frame signal is transmitted during transmission of the radio frame signal; and the transmission control part is configured to control a carrier sense parameter, the carrier sense parameter being a parameter having effect on the transmission-in-transmission collision occurrence status, the carrier sense parameter being used at a time of checking channel availability. ### Claim 27 (depends on 24) The wireless communication terminal according to claim 24, wherein: the transmission loss information detection part is configured to calculate a transmission loss rate on a basis of the transmission loss information, the transmission loss rate being a probability that the radio frame signal has not reached a transmission destination; and the transmission control part is configured to control a parameter corresponding to the collision status in a case where the transmission loss rate detected by the transmission loss information detection part exceeds a transmission loss rate threshold, the transmission loss rate threshold being a given threshold determined in advance. ### Claim 28 (depends on 27) The wireless communication terminal according to claim 27, wherein: the transmission control part is configured to calculate a collision rate on a basis of a number of wireless communications by the wireless module part and a number of collisions detected by the collision information detection part, and change a transmission power parameter in a case where the calculated collision rate is not more than a collision rate threshold, whereas determine that collision has occurred and control a parameter corresponding to the collision status in a case where the collision rate is more than the collision rate threshold, the collision rate threshold being a given threshold determined in advance, and the transmission power parameter being a parameter used when the wireless module part transmits the radio frame signal. ### Claim 29 A wireless communication method comprising: detecting transmission loss information and collision information, the transmission loss information representing whether or not a transmitted radio frame signal has reached a transmission destination, the collision information representing an aspect of collision between the radio frame signal and another radio frame signal; and controlling a transmission process on a basis of the detected transmission loss information and the detected collision information. ### Claim 30 (depends on 29) The wireless communication method according to claim 29, comprising: detecting the collision information including collision presence or absence information, the collision presence or absence information representing presence or absence of collision between the radio frame signal and another radio frame signal; and controlling the transmission process on a basis of the detected transmission loss information and the detected collision information including the collision presence or absence information. ### Claim 31 (depends on 29) The wireless communication method according to claim 29, comprising: detecting the collision information including collision status information, the collision status information representing a collision status of the radio frame signal and another radio frame signal; and controlling a parameter corresponding to the collision status on a basis of the detected transmission loss information and the detected collision information including the collision status information, the parameter being used when executing the transmission process. ### Claim 32 A non-transitory computer-readable medium storing a program comprising instructions for causing a wireless communication terminal to realize: a wireless module part configured to transmit a radio frame signal; a transmission loss information detection part configured to detect transmission loss information, the transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part configured to detect collision information, the collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part configured to control a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information.