# US 2019/0246394 A1 · Systems And Methods Of Sharing Channel Information Between Co-Located Radio Nodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246394 A1 - Document ID: US20190246394A1 - Status: Published application - Kind: A1 - Application number: 16/344,498 - Filed: 2017-10-31 - Published: 2019-08-08 - Earliest claimed: 2016-10-31 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Henrik Asplund; Jonas Medbo; Peter Ökvist; Mathias Riback; Arne Simonsson; Paul Mihkel Teder; Magnus Thurfjell - Web page: https://patentgrep.com/patent/US20190246394A1 ## CPC - H04W 72/27: between access points - H04L 1/0026: {Transmission of channel quality indication} - H04L 25/0202: {Channel estimation} - H04W 36/0044: {of quality context information} - H04W 36/085: {involving beams of access points} - H04W 36/38: by fixed network equipment - H04W 56/001: {Synchronization between nodes} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 74/002: {Transmission of channel access control information} - 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 Systems and methods of sharing channel information between co-located radio nodes are provided. In one exemplary embodiment, a method performed by a second radio node (111, 200, 300a, b, 1111) of sharing channel information between a first radio node (101, 500, 600a, b, 1101) and the second radio node that are co-located (107) may include obtaining (403), by the second radio node, first channel information characterizing a communication channel (105a-c) between a third radio node (121, 1121) and the first radio node in a first frequency band. Further, the method may include using (405), by the second radio node, the first channel information for communication with the third radio node or a fourth radio node (123) in a second frequency band. ## Claims ### Claim at position 1 1-68. (canceled) ### Claim 69 A method, performed by a second radio node, of sharing channel information between a first radio node and the second radio node that are co-located, the method comprising the second radio node: obtaining first channel information that characterizes a communication channel between a third radio node and the first radio node in a first frequency band; and using the first channel information for communication with the third node or a fourth radio node in a second frequency band. ### Claim 70 (depends on 69) The method of claim 69: wherein the using the first channel information includes beamforming a signal for transmission to the third node or the fourth node in the second frequency band based on direction of arrival or departure information of a respective reception or transmission of a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the direction of arrival or departure information related to the first frequency band. ### Claim 71 (depends on 69) The method of claim 69: wherein the using the first channel information includes estimating direction of arrival or departure information of a respective reception or transmission of a communication between the third node or the fourth node and the second radio node in the second frequency band based on direction of arrival or departure information of a respective reception or transmission of a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the direction of arrival or departure information related to the first frequency band. ### Claim 72 (depends on 69) The method of claim 69: wherein the using the first channel information includes beam searching or tracking a transmission between the third node or the fourth node and the second radio node in the second frequency band based on direction of arrival or departure information of a respective reception or transmission of a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the direction of arrival or departure information related to the first frequency band. ### Claim 73 (depends on 69) The method of claim 69: wherein the using the first channel information includes determining a channel estimate of a signal received from the third node or the fourth node in the second frequency band based on channel estimate information associated with a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the channel estimate information. ### Claim 74 (depends on 69) The method of claim 69, wherein the using the first channel information includes determining a direction of arrival or departure of a respective reception or transmission of a communication between the third node or the fourth node and the second radio node in the second frequency band responsive to determining that the first channel information indicates that the communication channel between the third node and the first radio node in the first frequency band is blocked. ### Claim 75 (depends on 69) The method of claim 69, wherein the using the first channel information includes determining to perform a handover associated with the third node or the fourth node responsive to determining that the first channel information indicates that the communication channel between the third node and the first radio node in the first frequency band is blocked. ### Claim 76 (depends on 69) The method of claim 69, wherein the using the first channel information includes determining a candidate set of beams, radio nodes, or cells that are capable of communications with the third node or the fourth node responsive to determining that the first channel information indicates that the communication channel between the third node and the first radio node in the first frequency band is blocked. ### Claim 77 (depends on 76) The method of claim 76, further comprising sending, to the first radio node, an indication of the candidate set of beams, radio nodes, or cells. ### Claim 78 (depends on 69) The method of claim 69: wherein the using the first channel information includes beam searching or tracking a transmission between the third node or the fourth node and the second radio node in the second frequency band based on a beam usage statistic associated with reception or transmission of a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the beam usage statistic. ### Claim 79 (depends on 69) The method of claim 69: wherein the using the first channel information includes configuring a granularity of reference signals or channel state information (CSI) reporting for the communication with the third node or the fourth node in the second frequency band based on channel estimate information associated with communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the channel estimate information. ### Claim 80 (depends on 69) The method of claim 69: wherein the using the first channel information includes adapting a transmission parameter for the communication with the third node or the fourth node in the second frequency band based on channel quality information related to a communication between the third node and the first radio node in the first frequency band; and wherein the first channel information includes the channel quality information. ### Claim 81 (depends on 69) The method of claim 69, wherein the first channel information includes propagation delay information related to a communication between the third node and the first radio node in the first frequency band. ### Claim 82 (depends on 81) The method of claim 81, wherein the propagation delay information includes: mean propagation delay, delay spread, coherence bandwidth, timing advance, and/or roundtrip time. ### Claim 83 A second radio node capable of sharing channel information with a first radio node that is co-located with the second radio node, the second radio node comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the second radio node is operative to: obtain first channel information that characterizes a communication channel between a third radio node and the first radio node in a first frequency band; and use the first channel information for communication with the third node or a fourth radio node in a second frequency band. ### Claim 84 A method, performed by a first radio node, of sharing channel information between the first radio node and a second radio node that are co-located, the method comprising the first radio node: obtaining first channel information that characterizes a communication channel between a third radio node and the first radio node in a first frequency band; and sending, to the second radio node, the first channel information so as to allow the second radio node to use the first channel information for communication with the third node or a fourth radio node in a second frequency band. ### Claim 85 A first radio node capable of sharing channel information with a second radio node that is co-located with the first radio node, the first radio node comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the device is operative to: obtain first channel information that characterizes a communication channel between a third radio node and the first radio node in a first frequency band; and send, to the second radio node, the first channel information so as to allow the second radio node to use the first channel information for communication with the third node or a fourth radio node in a second frequency band. ### Claim 86 A method, performed by a network node, for sharing channel information between first and second radio nodes that are co-located, the method comprising the network node: receiving, from the first radio node, first channel information that characterizes a first communication channel between the first radio node and a third radio node in a first frequency band; determining second channel information that characterizes a second communication channel between the third node or a fourth radio node and the second radio node in the second frequency band based on the first channel information; and sending, to the second radio node, the second channel information so as to allow the second radio node to use the second channel information for communication with the third node or the fourth node in the second frequency band. ### Claim 87 A network node capable of sharing channel information with first and second radio nodes that are co-located, the network node comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the device is operative to: receive, from the first radio node, first channel information that characterizes a first communication channel between the first radio node and a third radio node in a first frequency band; determine second channel information that characterizes a second communication channel between the third node or a fourth radio node and the second radio node in the second frequency band based on the first channel information; and send, to the second radio node, the second channel information so as to allow the second radio node to use the second channel information for communication with the third node or the fourth node in the second frequency band.