# US 10,771,129 B2 · Method and arrangement in a wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,129 B2 - Document ID: US10771129B2 - Status: Granted - Kind: B2 - Application number: 15/864,929 - Filed: 2018-01-08 - Published: 2018-05-10 - Granted: 2020-09-08 - Earliest claimed: 2007-01-12 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: George Jöngren; Bo Göransson - Web page: https://patentgrep.com/patent/US10771129B2 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0481: {using subset selection of codebooks} - H04B 7/0482: {Adaptive codebooks} - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B 7/0658: {Feedback reduction} - H04L 1/0001: {Systems modifying transmission characteristics according to link quality, e.g. power backoff (adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04)} - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0028: {Formatting} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for assisting the adaptation of a signal from a first node to a second node is provided. The first node communicates with the second node in a wireless communication system over a radio link. The second node has a codebook comprising a set of possible information alternatives for assisting the adaptation of a signal received from the first node. The second node may select an information alternative from the codebook and send it to the first node to assist the first node in adapting the signal. The first node is configured with a number of subsets, each comprising a part of the possible information alternatives. The first node requests that the second node restrict the selection of information alternatives to one of the subsets, and in response, receives an information alternative from the second node that is selected from among the subsets configured according to the configuration request. ## Claims ### Claim 1 A method in a first node for adapting a signal to be sent over a radio link from the first node to a second node in a wireless communication system, wherein the second node is configured to use a codebook comprising a set of possible information alternatives for use by the first node in adapting the signal, said method comprising: sending a message to the second node comprising a configuration request to the second node to restrict selection of information alternatives by the second node to at least one subset of the set of possible information alternatives, wherein each subset comprises at least a part of the codebook and wherein the configuration request comprises a bit map that specifies which at least one subset to restrict the selection to; and receiving a report of an information alternative from the second node, which information alternative is selected from the at least one subset configured according to the configuration request. ### Claim 2 (depends on 1) The method of claim 1, further comprising determining the at least one subset to use for restricting information alternative selection by the second node. ### Claim 3 (depends on 2) The method of claim 2, wherein said determining is based on at least one of a deployment scenario and a reliability analysis, in the first node of the second node reporting to the first node. ### Claim 4 (depends on 2) The method of claim 2, wherein said determining is performed by searching for a subset by trying different subsets and selecting the one which maximizes a performance metric. ### Claim 5 (depends on 1) The method of claim 1, wherein the bit map comprises bits that correspond to information alternatives. ### Claim 6 (depends on 1) The method of claim 1, wherein the value of each bit in the bit map indicates whether to include or exclude a corresponding information alternative in the at least one subset. ### Claim 7 (depends on 1) The method of claim 1, wherein said receiving the report of the information alternative includes receiving the report of the information alternative according to a specific signalling format that comprises certain bits that signal the information alternative. ### Claim 8 (depends on 1) The method of claim 1, wherein the codebook comprises one or several precoders, or comprises one or several precoders and one or several transmission ranks, or combinations thereof. ### Claim 9 (depends on 1) The method of claim 1, wherein the codebook comprises one or more of precoder matrices, transmission ranks, modulation choices, transport block sizes, powers or channelization codes. ### Claim 10 (depends on 1) The method of claim 1, wherein the first node is a base station. ### Claim 11 (depends on 1) The method of claim 1, wherein the first node is a user equipment. ### Claim 12 A method in a second node for assisting a first node in the adaptation of a signal to be sent over a radio link from the first node to the second node in a wireless communication system, wherein the second node is configured to use a codebook comprising a set of possible information alternatives for use by the first node in adapting the signal, said method comprising: receiving a message from the first node, the message comprising a configuration request to restrict selection of information alternatives by the second node to at least one subset of the set of possible information alternatives, wherein each subset comprises at least a part of the codebook and wherein the configuration request comprises a bit map that specifies which at least one subset to restrict the selection to; selecting an information alternative from the at least one subset configured according to the configuration request; and reporting the selected information alternative to the first node. ### Claim 13 (depends on 12) The method of claim 12, wherein the codebook comprises one or several precoders, or comprises one or several precoders and one or several transmission ranks, or combinations thereof, and wherein said selecting an information alternative comprises selecting an element in the at least one subset that optimizes a performance metric. ### Claim 14 (depends on 12) The method of claim 12, wherein the bit map comprises bits that correspond to information alternatives. ### Claim 15 (depends on 12) The method of claim 12, wherein the value of each bit in the bit map indicates whether to include or exclude a corresponding information alternative in the at least one subset. ### Claim 16 (depends on 12) The method of claim 12, wherein the codebook comprises a precoder, or comprises a precoder and a transmission rank. ### Claim 17 (depends on 12) The method of claim 12, wherein the codebook comprises one or more of precoder matrices, transmission ranks, modulation choices, transport block sizes, powers or channelization codes. ### Claim 18 (depends on 12) The method of claim 12, wherein said reporting comprises reporting the selected information alternative to the first node using a specific signaling format wherein certain bits signal the information alternative. ### Claim 19 (depends on 12) The method of claim 12, wherein the second node is a user equipment. ### Claim 20 (depends on 12) The method of claim 12, wherein the second node is a base station. ### Claim 21 A first node configured to communicate over a radio link with a second node in a wireless communication system, wherein the second node is configured to use a codebook comprising a set of possible information alternatives for use by the first node in adapting a signal to be sent from the first node to the second node over the radio link, said first node comprising: a transmitter configured to send a message to the second node, the message comprising a configuration request to the second node to restrict selection of information alternatives by the second node to at least one subset of the set of possible information alternatives, wherein each subset comprises at least a part of the codebook and wherein the configuration request comprises a bit map that specifies which at least one subset to restrict the selection to; and a receiver configured to receive a report of an information alternative from the second node that was selected by the second node from the at least one subset, as configured according to the configuration request. ### Claim 22 (depends on 21) The method of claim 21, wherein the bit map comprises bits that correspond to information alternatives. ### Claim 23 (depends on 21) The method of claim 21, wherein the value of each bit in the bit map indicates whether to include or exclude a corresponding information alternative in the at least one subset. ### Claim 24 (depends on 21) The first node of claim 21, wherein the first node is a base station. ### Claim 25 (depends on 21) The first node of claim 21, wherein the first node is a user equipment. ### Claim 26 A second node configured to communicate over a radio link with a first node in a wireless communication system, wherein the second node is configured to use a codebook comprising a set of possible information alternatives for use by the first node in adapting a signal to be sent from the first node to the second node over the radio link, said second node comprising: a receiver configured to receive a message from the first node, the message comprising a configuration request to restrict selection of information alternatives by the second node to at least one subset of the set of possible information alternatives, wherein each subset comprises at least a part of the codebook and wherein the configuration request comprises a bit map that specifies which at least one subset to restrict the selection to; a processor circuit configured to select an information alternative from the at least one subset configured according to the configuration request; and a transmitter configured to report the selected information alternative to the first node. ### Claim 27 (depends on 26) The method of claim 26, wherein the bit map comprises bits that correspond to information alternatives. ### Claim 28 (depends on 26) The method of claim 26, wherein the value of each bit in the bit map indicates whether to include or exclude a corresponding information alternative in the at least one subset. ### Claim 29 (depends on 26) The second node of claim 26, wherein the second node is a user equipment. ### Claim 30 (depends on 26) The second node of claim 26, wherein the second node is a base station.