# US 2017/0257150 A1 · Distributed radio base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0257150 A1 - Document ID: US20170257150A1 - Status: Published application - Kind: A1 - Application number: 15/500,094 - Filed: 2014-07-30 - Published: 2017-09-07 - Earliest claimed: 2014-07-29 - Assignees: Cmaxwireless.Co.,Ltd. - Applicants: Cmaxwireless.Co.,Ltd. - Inventors: Young-su CHAE; Min-ho SUNG; Dong-hoon CHAE - Web page: https://patentgrep.com/patent/US20170257150A1 ## CPC - H04B 7/26: at least one of which is mobile - H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04) - H04B 7/24: for communication between two or more posts (wireless communication networks H04W) - H04L 9/40: Network security protocols - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present invention relates to a distributed radio base station, and provides a distributed radio base station, including: one or more base units (BUs) configured to process digital signals; and one or more radio units (RUs) installed in one or more target service areas, and configured to wirelessly communicate with pieces of user equipment; wherein each of the BUs is coupled to a cell group, composed of a set of RU groups each formed by grouping one or more of the RUs, over a transport network. ## Claims ### Claim 1 A distributed radio base station, comprising: one or more base units (BUs) configured to process digital signals; and one or more radio units (RUs) installed in one or more target service areas, and configured to wirelessly communicate with pieces of user equipment; wherein each of the BUs is coupled to a cell group, composed of a set of RU groups each formed by grouping one or more of the RUs, over a transport network. ### Claim 2 (depends on 1) The distributed radio base station of claim 1, wherein each of the RU groups is composed of RUs grouped based on a physical space of a corresponding one of the target service areas. ### Claim 3 (depends on 1) The distributed radio base station of claim 1, wherein each of the RU groups is composed of RUs grouped based on information about the pieces of user equipment. ### Claim 4 (depends on 1) The distributed radio base station of claim 1, wherein one of the RUs is included in a plurality of RU groups. ### Claim 5 (depends on 1) The distributed radio base station of claim 1, wherein one of the RU groups is included in a plurality of cell groups. ### Claim 6 (depends on 1) The distributed radio base station of claim 1, wherein: the BUs perform operations of layers equal to or higher than L2 and L3, and the RUs perform an operation of L1; and each of the RUs comprises: an L1 processing unit configured to perform an operation of L1; an RF processing unit configured to process radio signals; and an antenna configured to transmit or receive radio signals. ### Claim 7 (depends on 1) The distributed radio base station of claim 1, wherein, when the transport network is an IP network, each of the BUs and corresponding ones of the RUs have respective single unique unicast IP addresses on the transport network, and use one or more multicast IP addresses. ### Claim 8 (depends on 7) The distributed radio base station of claim 7, wherein: each of the RUs uses a number of multicast IP addresses equal to the number of RU groups to which the RU belongs, and also uses a cell group multicast IP address unique to a cell group to which the RU belongs; and each of the BUs uses a number of multicast IP addresses equal to the number of RU groups to which the BU is coupled, and also uses a cell group multicast IP address unique to a cell group to which the BU is coupled. ### Claim 9 (depends on 8) The distributed radio base station of claim 8, wherein the BU transmits identical data to RUs, belonging to the RU groups to which the BU is coupled, by transmitting a plurality of IP unicast packets having respective unique unicast IP addresses of the RUs, belonging to the RU groups to which the BU is coupled, as destination addresses. ### Claim 10 (depends on 8) The distributed radio base station of claim 8, wherein the BU transmits identical data to RUs, belonging to the RU groups to which the BU is coupled, by transmitting single IP multicast packets having respective multicast IP addresses of the RU groups, to which the BU is coupled, as destination addresses. ### Claim 11 (depends on 8) The distributed radio base station of claim 8, wherein the BU transmits identical data to all RUs of the cell group, to which the BU is coupled, by transmitting an IP multicast packet having a multicast IP address of the corresponding cell group as a destination address. ### Claim 12 (depends on 1) The distributed radio base station of claim 1, wherein, when the transport network is an Ethernet, each of the BUs and corresponding ones of the RUs have respective single unique MAC addresses on the transport network, and use one or more multicast MAC addresses. ### Claim 13 (depends on 12) The distributed radio base station of claim 12, wherein: each of the RUs uses a number of multicast MAC addresses equal to a number of RU groups to which the RU belongs, and also uses a cell group multicast MAC address unique to a cell group to which the RU belongs; and each of the BUs uses a number of multicast MAC addresses equal to a number of RU groups to which the BU is coupled, and also uses a cell group multicast MAC address unique to a cell group to which the BU is coupled. ### Claim 14 (depends on 13) The distributed radio base station of claim 13, wherein the BU transmits identical data to RUs, belonging to the RU groups to which the BU is coupled, by using a plurality of Ethernet unicast frames having respective unique unicast MAC addresses of the RUs, belonging to the RU groups to which the BU is coupled, as destination addresses. ### Claim 15 (depends on 13) The distributed radio base station of claim 13, wherein the BU transmits identical data to RUs, belonging to the RU groups to which the BU is coupled, by using Ethernet multicast frames having respective multicast MAC addresses of the RU groups, to which the BU is coupled, as destination addresses. ### Claim 16 (depends on 13) The distributed radio base station of claim 13, wherein the BU transmits identical data to all RUs, belonging to the cell group to which the BU is coupled, by using an Ethernet multicast frame having a multicast MAC address of the corresponding cell group as a destination address. ### Claim 17 (depends on 1) The distributed radio base station of claim 1, wherein the RU groups and the cell groups are changeable such that they can be dynamically constructed.