# US 8,570,863 B2 · Method and apparatus for avoiding collision of uplink preamble using cell identifier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,863 B2 - Document ID: US8570863B2 - Status: Granted - Kind: B2 - Application number: 12/944,472 - Filed: 2010-11-11 - Published: 2011-06-23 - Granted: 2013-10-29 - Earliest claimed: 2009-12-21 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Chan Yong Lee - Inventors: Chan Yong Lee - Web page: https://patentgrep.com/patent/US8570863B2 ## CPC - H04W 8/26: Network addressing or numbering for mobility support - H04W 28/18: Negotiating wireless communication parameters - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method and apparatus for avoiding a collision of an uplink preamble using a cell identifier. In a case of installing a new small-sized base station in a mobile communication system, the method and apparatus may set a code parameter, a time parameter, and a frequency parameter, differently from a neighboring small-sized base station using the cell identifier even when dedicatedly using a preamble in a contention-free scheme to avoid a collision of the preamble, so that a random access preamble may be managed without occurrence of the collision with the neighboring small-sized base stations. ## Claims ### Claim 1 An apparatus for avoiding collision of a preamble in a small-sized base station, the apparatus comprising: a neighboring cell identifying unit to collect a cell identifier of a neighboring cell to verify presence/absence of the neighboring cell and to identify the neighboring cell; a parameter requesting unit to generate a parameter request message requesting a setting of parameters and including the cell identifier of the neighboring cell, and to transmit the generated parameter request message to an operation administration maintenance (OAM); and a parameter setting unit to verify an allocated cell identifier included in a parameter response message and parameters corresponding to the allocated cell identifier when receiving the parameter response message from the OAM, and to set a preamble using the verified parameters. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the parameters are at least one of code parameters, time parameters, and frequency parameters. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the neighboring cell identifying unit receives information about the neighboring cell through an interface with a terminal within a cell area or with a peripheral device. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the neighboring cell identifying unit collects the information about the neighboring cell from an SIB received from a terminal within a cell area or a peripheral device. ### Claim 5 (depends on 3) The apparatus of claim 3, wherein the peripheral device includes an upper macro base station, a peripheral femto base station, and a peripheral pico base station. ### Claim 6 An apparatus for avoiding collision of a preamble in an operation administration maintenance (OAM), the apparatus comprising: a parameter request reception unit to verify a cell identifier of a neighboring cell included in a parameter request message when receiving the parameter request message from a small-sized base station being incapable of independently setting a parameter; a mapping database to store predetermined parameters corresponding to each of predetermined cell identifiers; a cell identifier allocation unit to select, from the mapping database, a cell identifier unused in neighboring cells, and to allocate the selected cell identifier to a corresponding small-sized base station; and a parameter response processing unit to verify, in the mapping database, parameters corresponding to the allocated cell identifier, to generate a parameter response message including the allocated cell identifier and the parameters corresponding to the allocated cell identifier, and to transmit the generated parameter response message to the small-sized base station. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the parameters are at least one of code parameters, time parameters, and frequency parameters. ### Claim 8 A method for avoiding a collision of a preamble in a small-sized base station, the method comprising: collecting a cell identifier of a neighboring cell to verify presence/absence of the neighboring cells, and to identify the neighboring cell; generating a parameter request message including the cell identifier of the neighboring cell requesting a setting of parameters, transmitting the generated parameter request message; and verifying an allocated cell identifier included in the parameter request message and parameters corresponding to the allocated cell identifier when receiving a parameter response message from an OAM; and setting the preamble using the verified parameters. ### Claim 9 (depends on 8) The method of claim 8, wherein the parameters are at least one of code parameters, time parameters, and frequency parameters. ### Claim 10 A method for avoiding collision of a preamble in an OAM, the method comprising: verifying a cell identifier of a neighboring cell included in a parameter request message when receiving the parameter request message from a small-sized base station being incapable of independently setting a parameter; selecting, from a mapping database where predetermined parameters corresponding to each of predetermined cell identifiers are stored, a cell identifier unused in neighboring cells, and allocating, to the small-sized base station, the selected cell identifier as a cell identifier of the small-sized base station; verifying, in the mapping database, parameters corresponding to the allocated cell identifier; and generating a parameter response message including the allocated cell identifier and parameters corresponding to the allocated cell identifier, and transmitting the generated parameter response message to the small-sized base station. ### Claim 11 (depends on 10) The method of claim 10, wherein the parameters are at least one of code parameters, time parameters, and frequency parameters.