# US 9,520,958 B2 · Transmission angle control device, base station, transmission angle control 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 9,520,958 B2 - Document ID: US9520958B2 - Status: Granted - Kind: B2 - Application number: 14/127,481 - Filed: 2012-06-22 - Published: 2014-04-24 - Granted: 2016-12-13 - Earliest claimed: 2011-06-23 - Assignees: NEC Corporation - Applicants: Kenichirou Yamazaki - Inventors: Kenichirou Yamazaki - Web page: https://patentgrep.com/patent/US9520958B2 ## CPC - H04J 3/00: Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q) - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04W 16/28: using beam steering - H04B 7/0617: {for beam forming} - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A transmission angle control device in a wireless communication system based on a TDD scheme includes: an interference signal detection unit that detects a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station and that outputs the interference level as an interference information signal; and a transmission angle determining unit that adjusts a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal. ## Claims ### Claim 1 A transmission angle control device disposed on a first base station in a wireless communication system based on a TDD (Time Division Duplex) scheme, the transmission angle control device comprising: a computer readable storage medium storing program instructions; and a processor executing the program instructions, the processor configured to: detect a level of interference on a second base station caused by a signal transmitted by the first base station based on a received signal received from the second base station and output the interference level as an interference information signal; and adjust a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal indicative of the level of interference caused by the first base station on the second base station, wherein the adjusting includes adjusting the transmission angle downward when the interference level is not less than a predetermined threshold value, and wherein the adjusting includes maintaining the transmission angle or adjusting the transmission angle upward when the interference level is less than a predetermined threshold value. ### Claim 2 (depends on 1) The transmission angle control device according to claim 1, wherein the received signal indicates the level of interference on the second base station caused by the signal transmitted by the first base station and includes information indicating the level of interference detected by the second base station. ### Claim 3 (depends on 1) The transmission angle control device according to claim 1, wherein the detecting comprises estimating the level of interference based on the received signal by deeming that the level of interference on the second base station caused by the signal transmitted by the first base station is equal to a second level of interference on the first base station caused by the received signal received from the second base station. ### Claim 4 (depends on 1) The transmission angle control device according to claim 1, wherein the adjusting includes adjusting the transmission angle of the signal transmitted by the first base station in a vertical direction by referring to a table that associates an interference level with a transmission angle in the vertical direction. ### Claim 5 (depends on 1) A base station comprising the first base station comprising the transmission angle control device according to claim 1. ### Claim 6 (depends on 1) The transmission angle control device according to claim 1, wherein the level of interference comprises a level of downlink interference on the second base station caused by the signal transmitted by the first base station. ### Claim 7 (depends on 1) The transmission angle control device according to claim 1, further comprising a computer including the processor and the computer readable storage medium, the computer readable storage medium being non-transitory. ### Claim 8 A transmission angle control method in a wireless communication system based on a TDD (Time Division Duplex) scheme, the method comprising: detecting a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station; and adjusting a transmission angle of a signal transmitted by the first base station in a vertical direction according to the level of interference caused by the first base station on the second base station, wherein the adjusting includes adjusting the transmission angle downward when the interference level is not less than a predetermined threshold value, and wherein the adjusting includes maintaining the transmission angle or adjusting the transmission angle upward when the interference level is less than a predetermined threshold value. ### Claim 9 (depends on 8) The transmission angle control method according to claim 8, wherein the received signal indicates the level of interference on the second base station caused by the signal transmitted by the first base station and includes information indicating the level of interference detected by the second base station. ### Claim 10 (depends on 8) The transmission angle control method according to claim 8, wherein the detecting comprises estimating the level of interference based on the received signal by deeming that the level of interference on the second base station caused by the signal transmitted by the first base station is equal to a second level of interference on the first base station caused by the received signal received from the second base station. ### Claim 11 A non-transitory computer-readable recording medium, storing a program that causes a computer provided in a first base station in a wireless communication system based on a TDD (Time Division Duplex) scheme to execute: detecting a level of interference on a second base station caused by a signal transmitted by the first base station based on a received signal received from the second base station; and adjusting a transmission angle of a signal transmitted by the first base station in a vertical direction according to the level of interference caused by the first base station on the second base station, wherein the adjusting includes adjusting the transmission angle downward when the interference level is not less than a predetermined threshold value, and wherein the adjusting includes maintaining the transmission angle or adjusting the transmission angle upward when the interference level is less than a predetermined threshold value. ### Claim 12 (depends on 11) The non-transitory computer-readable recording medium according to claim 11, wherein the received signal indicates the level of interference on the second base station caused by the signal transmitted by the first base station and includes information indicating the level of interference detected by the second base station. ### Claim 13 (depends on 11) The non-transitory computer-readable recording medium according to claim 11, wherein the detecting comprises estimating the level of interference based on the received signal by deeming that the level of interference on the second base station caused by the signal transmitted by the first base station is equal to a second level of interference on the first base station caused by the received signal received from the second base station.