# US 2014/0153499 A1 · Signaling data channel's configuration information to facilitate interference cancellation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153499 A1 - Document ID: US20140153499A1 - Status: Published application - Kind: A1 - Application number: 13/824,763 - Filed: 2013-02-27 - Published: 2014-06-05 - Earliest claimed: 2012-03-05 - Assignees: Telefonaktiebolaget L M Ericsson (publ) - Applicants: Telefonaktiebolaget L M Ericsson (publ) - Inventors: Yi-Pin Eric Wang; Johan Bergman; Erik Dahlman; Stephen Grant; Stefan Parkvall; Edgar Ramos; Andres Reial - Web page: https://patentgrep.com/patent/US20140153499A1 ## CPC - H04W 24/02: Arrangements for optimising operational condition - H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference - H04B 1/7097: Interference-related aspects - H04J 11/005: {of intercell interference} - H04W 40/16: based on interference - H04W 52/0238: {where the received signal is an unwanted signal, e.g. interference or idle signal} - H04W 74/0841: {with collision treatment} - H04W 28/0236: {radio quality, e.g. interference, losses or delay} - H04W 72/541: using the level of interference - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract In MU-MIMO scenarios, a target terminal can be exposed to data streams intended for other terminals. If the target terminal is capable of interference cancellation, then a network node, such as a base station or RNC, can provide the target terminal with interference information so that the target terminal can efficiently cancel interferences due to these interfering data streams. The interference information may include one or more interfering configuration, each of which characterizes a related interfering data stream. The interference information can also include the identity of the other terminal that is the intended recipient of the interfering stream. The network node may determine whether the target terminal can benefit from the interference information. If so, the network node can provide the interference information to the target terminal. ## Claims ### Claim 1 A method performed by a network node of a wireless network to provide communication services to a target terminal, the method comprising: determining whether the target terminal will benefit from interference information; transmitting the interference information to the target terminal when it is determined that the target terminal will benefit from the interference information; and transmitting a plurality of data streams to one or more terminals in a cell being served by the network node, wherein for each data stream, the network node also transmits a corresponding configuration information that identifies air interface resources allocated to that data stream, wherein an interfering stream is a data stream intended for a terminal other than the target terminal, and an interfering configuration is the configuration information corresponding to the interfering stream, and wherein in the step of transmitting the interference information to the target terminal, the interfering configuration and/or an identity of the other terminal are transmitted as the interference information. ### Claim 2 (depends on 1) The method of claim 1, wherein in the step transmitting the interference information to the target terminal, the interference information is broadcasted over a signal channel, the broadcast being packaged such that a plurality of terminals are able to read the interference information. ### Claim 3 (depends on 2) The method of claim 2, wherein the signal channel is a shared control channel used by the network node to transmit the configuration information corresponding to the data streams, wherein in the step of transmitting the interference information to the target terminal, the interfering configuration is included in the interference information transmitted over the shared control channel, and wherein the interference information is generated according to generated according to a predetermined group ID, the group ID being understood by the plurality of terminals to indicate that the interference information includes the interfering configuration. ### Claim 4 (depends on 2) The method of claim 2, wherein the signal channel is different from a shared control channel used by the network node to transmit the configuration information corresponding to the data streams, and wherein the step of transmitting the interference information to the target terminal, the identity of the other terminal is included in the interference information transmitted over the signal channel. ### Claim 5 (depends on 1) The method of claim 1, wherein the step of transmitting the interference information comprises one of: power controlling the interference information broadcast to a channel condition of the target terminal; and applying a predetermined power to the interference information broadcast without power controlling. ### Claim 6 (depends on 1) The method of claim 1, wherein the step of determining whether the target terminal will benefit from the interference information comprises: determining a first condition of whether the target terminal is in a data state; determining a second condition of whether the target terminal is IC (interference cancellation) capable; determining that the target terminal will benefit when it is determined that both the first and second conditions are true; and determining that the target terminal will not benefit when it is determined that one or both the first and second conditions are not true. ### Claim 7 (depends on 1) The method of claim 1, further comprising notifying the target terminal to monitor for the interference information. ### Claim 8 A method performed by a target terminal capable of performing interference cancellation, the method comprising: receiving interference information from a network node; receiving a plurality of data streams transmitted from the network node, the plurality of data streams including an interfering stream; canceling the interfering stream from the plurality of data streams based on the interference information, wherein for each data stream, the network node also transmits a corresponding configuration information that identifies air interface resources allocated to that data stream, wherein an interfering stream is a data stream intended for a terminal other than the target terminal, and an interfering configuration is the configuration information corresponding to the interfering stream, and wherein the interference information includes the interfering configuration and/or an identity of the other terminal. ### Claim 9 (depends on 8) The method of claim 8, wherein in the step receiving the interference information from the network node, the interference information is received as a broadcast over a signal channel, the broadcast being packaged such that a plurality of terminals are able to read the interference information, and wherein the step of canceling the interfering stream from the plurality of data streams comprises: retrieving the interfering configuration based on the interference information; regenerating symbols of the interfering stream based on the interfering configuration; and canceling the regenerated symbols of the interfering stream from the plurality of data streams. ### Claim 10 (depends on 9) The method of claim 9, wherein the signal channel is a shared control channel used by the network node to transmit the configuration information corresponding to the data streams over the shared control channel, and wherein the step of retrieving the interfering configuration comprises retrieving the interfering configuration from the interference information received over the shared control channel according to a predetermined group ID, the group ID being understood by a plurality terminals, including the target terminal, to indicate that the interference information includes the interfering configuration. ### Claim 11 (depends on 9) The method of claim 9, wherein the signal channel is a different channel from a shared control channel used by the network node to transmit the configuration information corresponding to the data streams, and wherein the step of retrieving the interfering configuration comprises: retrieving the identity of the other terminal from the interference information received over the signal channel; and eavesdropping on the shared control channel using the identity of the other terminal when the network node transmits the configuration information corresponding to the plurality of data streams to retrieve the interfering configuration. ### Claim 12 (depends on 8) The method of claim 8, further comprising receiving a notification from the network node to monitor for the interference information, wherein the step of receiving the interference information is performed in response to receiving the notification. ### Claim 13 A network node of a wireless network, the network node structured to provide communication services to a target terminal, the network node comprising: a terminal manager structured to determine whether the target terminal will benefit from interference information; an interference information manager structured to transmit the interference information to the target terminal when the terminal manager determines that the target terminal will benefit from the interference information; a configuration manager structured to transmit, for each of a plurality of data streams scheduled to be transmitted, a corresponding configuration information that identifies air interface resources allocated to that data stream; and a communicator structured to transmit the data streams as scheduled to one or more terminals in a cell being served by the network node, wherein an interfering stream is a data stream intended for a terminal other than the target terminal, and an interfering configuration is the configuration information corresponding to the interfering stream, and wherein in order to transmit the interference information to the target terminal, the interference information manager is structured to transmit the interfering configuration and/or an identity of the other terminal as the interference information. ### Claim 14 (depends on 13) The network node of claim 13, wherein in order to transmit the interference information to the target terminal, the interference information manager is structured to broadcast the interference information over a signal channel, the broadcast being packaged such that a plurality of terminals are able to read the interference information. ### Claim 15 (depends on 14) The network node of claim 14, wherein the signal channel is a shared control channel used by the configuration manager to transmit the configuration information corresponding to the data streams, and wherein in order to transmit the interference information to the target terminal, the interference information manager is structured to include the interfering configuration in the interference information and to generate a message to be transmitted over the shared control channel according to a predetermined group ID, the group ID being understood by the plurality of terminals to indicate that the interference information includes the interfering configuration. ### Claim 16 (depends on 14) The network node of claim 14, wherein the signal channel is different from a shared control channel used by the configuration manager to transmit the configuration information corresponding to the data streams, and wherein in order to transmit the interference information to the target terminal, the interference information manager is structured to include the identity of the other terminal in the interference information transmitted over the signal channel. ### Claim 17 (depends on 13) The network node of claim 13, wherein in order to transmit the interference information to the target terminal, the interference information manager is structured to power control the interference information broadcast to a channel condition of the target terminal, or apply a predetermined power to the interference information broadcast without power controlling. ### Claim 18 (depends on 13) The network node of claim 13, wherein in order to determine whether the target terminal will benefit from the interference information, the terminal manager is structured to determine a first condition of whether the target terminal is in a data state, determine a second condition of whether the target terminal is IC (interference cancellation) capable, determine that the target terminal will benefit when it is determined that both the first and second conditions are true, and determine that the target terminal will not benefit when it is determined that one or both the first and second conditions are not true. ### Claim 19 (depends on 13) The network node of claim 13, wherein the interference information manager is structured to notify the target terminal to monitor for the interference information. ### Claim 20 A target terminal capable of performing interference cancellation, the target terminal comprising: an interference information manager structured to receive interference information from a network node; a communicator structured to receive a plurality of data streams transmitted from the network node, the plurality of data streams including an interfering stream; and an IC receiver structured to cancel the interfering stream from the plurality of data streams based on the interference information, wherein for each data stream, the network node also transmits a corresponding configuration information that identifies air interface resources allocated to that data stream, wherein an interfering stream is a data stream intended for a terminal other than the target terminal, and an interfering configuration is the configuration information corresponding to the interfering stream, and wherein the interference information includes the interfering configuration and/or an identity of the other terminal. ### Claim 21 (depends on 20) The target terminal of claim 20, wherein the interference information manager is structured to receive the interference information from the network node as a broadcast over a signal channel, the broadcast being packaged such that a plurality of terminals are able to read the interference information, and retrieve the interfering configuration based on the interference information, and wherein in order to cancel the interfering stream from the plurality of data streams, the IC receiver is structured to regenerate symbols of the interfering stream based on the interfering configuration, and cancel the regenerated symbols of the interfering stream from the plurality of data streams. ### Claim 22 (depends on 21) The target terminal of claim 21, wherein the signal channel is a shared control channel used by the network node to transmit the configuration information corresponding to the data streams over the shared control channel, and wherein in order to retrieve the interfering configuration, the interference manager is structured to retrieve the interfering configuration from the interference information received over the shared control channel according to a predetermined group ID, the group ID being understood by a plurality terminals, including the target terminal, to indicate that the interference information includes the interfering configuration. ### Claim 23 (depends on 21) The target terminal of claim 21, wherein the signal channel is different from a shared control channel used by the network node to transmit the configuration information corresponding to the data streams over the shared control channel, and wherein in order to retrieve the interfering configuration, the interference manager is structured to retrieve the identity of the other terminal from the interference information received over the signal channel, and eavesdrop on the shared control channel using the identity of the other terminal when the network node transmits the configuration information corresponding to the plurality of data streams to retrieve the interfering configuration. ### Claim 24 (depends on 20) The target terminal of claim 20, wherein the interference information manager is structured to receive a notification from the network node to monitor for the interference information, and receive the interference information is performed in response to the notification. ### Claim 25 (depends on 1) A non-transitory computer-readable medium which has stored therein program instructions which when executed by a computer of a network node causes the computer to execute the method of claim 1. ### Claim 26 (depends on 8) A non-transitory computer-readable medium which has stored therein program instructions which when executed by a computer of a mobile terminal causes the computer to execute the method of claim 8.