# US 11,902,006 B2 · Communication system and operating method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,902,006 B2 - Document ID: US11902006B2 - Status: Granted - Kind: B2 - Application number: 17/779,423 - Filed: 2020-11-25 - Published: 2022-12-29 - Granted: 2024-02-13 - Earliest claimed: 2019-11-25 - Assignees: SOLiD, INC. - Applicants: SOLiD, INC. - Inventors: Woosik Moon; Hoony Hong; Kwon Kim; Hyunchae Kim - Web page: https://patentgrep.com/patent/US11902006B2 ## CPC - H04B 7/0802: {using antenna selection (H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24)} - H04B 7/155: Ground-based stations (H04B7/204 takes precedence) - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 88/085: {Access point devices with remote components} - 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 Provided are a method of operating a communication system, the method comprises mapping some antennas selected from among a plurality of antennas of each of a plurality of first communication nodes and reception ports of a second communication node, combining uplink signals mapped to an identical reception port of the second communication node from among uplink signals received through the plurality of antennas, and transmitting the combined signals to the mapped reception ports of the second communication node, respectively. ## Claims ### Claim 1 A method of operating a communication system, the method comprising: mapping some antennas selected from among a plurality of antennas of each of a plurality of first communication nodes and reception ports of a second communication node; combining uplink signals mapped to an identical reception port of the second communication node from among uplink signals received through the plurality of antennas; and transmitting the combined signals to the mapped reception ports of the second communication node, respectively. ### Claim 2 (depends on 1) The method of claim 1, wherein each of the first communication nodes is a remote unit or a hub unit, and the second communication node is a distributed unit. ### Claim 3 (depends on 1) The method of claim 1, further comprising: selecting some of the antennas to be mapped to the reception ports of the second communication node from among the plurality of antennas of each of the plurality of first communication nodes. ### Claim 4 (depends on 3) The method of claim 3, the selecting comprises: selecting the some antennas based on signal quality of the uplink signals received through the plurality of antennas of each of the plurality of first communication nodes. ### Claim 5 (depends on 4) The method of claim 4, wherein the signal quality is a signal to noise ratio (SNR) of a communication signal. ### Claim 6 (depends on 3) The method of claim 3, the selecting comprises: selecting the some antennas based on presence or absence of the uplink signal received through the plurality of antennas of each of the plurality of first communication nodes or load of the uplink signals. ### Claim 7 (depends on 6) The method of claim 6, wherein the load of the uplink signals is detected by searching for at least one of a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) included in the uplink signal. ### Claim 8 (depends on 1) The method of claim 1, wherein the mapping comprises: mapping the selected some antennas and the reception ports of the second communication node based on signal quality of the uplink signals received through the plurality of antennas of each of the plurality of first communication nodes. ### Claim 9 (depends on 1) The method of claim 1, wherein the mapping comprises: mapping the selected some antennas and the reception ports of the second communication node based on the load of the uplink signals received through the plurality of antennas of each of the plurality of first communication nodes. ### Claim 10 (depends on 1) The method of claim 1, wherein the mapping comprises: mapping any one of the plurality of antennas to at least two or more reception ports from among the plurality of reception ports of the second communication node. ### Claim 11 (depends on 1) The method of claim 1, wherein the mapping comprises: mapping at least some antennas from among the plurality of antennas of each of the first communication nodes to a reception port of the second communication node having a port number different from a port number of the at least some antennas. ### Claim 12 (depends on 1) The method of claim 1, wherein the mapping is performed in an uppermost node from among the plurality of first communication nodes connected to each other in a cascade structure, the second communication node, or an upper node of the second communication node. ### Claim 13 (depends on 1) The method of claim 1, further comprising: combining at least a portion of the uplink signals in an Equal Gain Combine (EGC) or Maximal Ratio Combine (MRC) manner. ### Claim 14 (depends on 1) The method of claim 1, further comprising: including mapping information in the uplink signals received by the first communication node. ### Claim 15 A communication system comprising: a plurality of first communication nodes each including a plurality of antennas; and a second communication node configured to receive uplink signals transmitted from the plurality of first communication nodes, wherein each of the plurality of first communication nodes includes mapping information of some antennas selected from among the plurality of antennas and reception ports of the second communication node to the uplink signals, combines uplink signals mapped to an identical reception port of the second communication node from among uplink signals received through the plurality of antennas based on the mapping information, and transmits the combined signals to the mapped reception ports of the second communication node, respectively.