# US RE50,011 E1 · Methods and devices for broadcasting system information on demand > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US RE50,011 E1 - Document ID: USRE50011E1 - Status: Granted - Kind: E1 - Application number: 17/388,539 - Filed: 2021-07-29 - Granted: 2024-06-11 - Earliest claimed: 2015-10-29 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Gen Li; Hai Wang; Jianfeng Wang - Web page: https://patentgrep.com/patent/USRE50011E1 ## CPC - H04W 72/30: Resource management for broadcast services - H04W 48/10: using broadcasted information - H04W 48/14: using user query {or user detection} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/51: based on terminal or device properties - 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) - 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 Embodiments of the present disclosure relate to methods and devices for broadcasting system information on demand. In example embodiments, the system information is classified as essential and optional system information. The essential information is broadcasted periodically, and the optional system information is broadcasted in response to the request by UEs. In this way, the system information can be in an effective and efficient way, thereby saving significant resource and energy can be saved especially in the case of no load or low load. ## Claims ### Claim 1 A method implemented by a device at a base station of a cell of a cellular network, comprising: broadcasting, to at least one terminal, essential system information, the essential system information comprising a resource configuration of a demand channel for requesting optional system information to be provided to the at least one terminal on a demand-basis and information identifying a predefined resource zone for receiving the optional system information in response to a request for the optional system information, wherein the essential system information is required to access a cell of the device, wherein the demand channel is a channel on which user equipments send a request for requesting at least a part of the optional system information on the demand-basis to avoid periodic transmission of the optional system information, wherein the information identifying the predefined resource zone comprises at least one of a time resource or a frequency resource an identifier of one or more physical resource blocks (PRBs) for receiving the optional system information, and wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal; while monitoring the demand channel, receiving a request from the at least one terminal for at least a part of optional system information other than the essential system information; and in response to receiving the request from a user equipment, broadcasting an indicator in the predefined resource zone to indicate existence of the part of the optional system information and broadcasting, on the demand basis, the part of the optional system information in the predefined resource zone. ### Claim 2 (depends on 1) The method of claim 1, wherein the demand channel is a common channel shared by terminals in the cell. ### Claim 3 (depends on 1) The method of claim 1, wherein broadcasting the essential system information and the resource configuration of the demand channel comprises: broadcasting the resource configuration of the demand channel and at least a part of the essential system information in an access information table (AIT). ### Claim 4 (depends on 1) The method of claim 1, wherein broadcasting the essential system information comprises: broadcasting semi-static system information of the essential system information with a first period; and broadcasting dynamic system information of the essential system information with a second period shorter than the first period, the dynamic system information including the resource configuration of the demand channel. ### Claim 5 (depends on 1) The method of claim 1, further comprising: broadcasting a configuration of a resource zone with the essential system information, wherein broadcasting the part of the optional system information comprises broadcasting the part of the optional system information in the resource zone. ### Claim 6 (depends on 1) The method of claim 1, wherein broadcasting essential system information and the resource configuration of the demand channel comprises: broadcasting the resource configuration of the demand channel as a part of the essential system information. ### Claim 7 (depends on 1) The method of claim 1, wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal. ### Claim 8 (depends on 1) The method of claim 1, further comprising: determining the resource configuration of the demand channel based on at least one of the following: beamforming of the device, or grouping of terminals in the cell. ### Claim 9 (depends on 1) The method of claim 1, wherein monitoring the request comprises: monitoring a sequence as the request, the sequence being common to a plurality of terminals in the cell. ### Claim 10 A device at a base station of a cell of a cellular network, comprising: a transceiver configured to broadcast, to at least one terminal, essential system information, the essential system information comprising a resource configuration of a demand channel for requesting optional system information to be provided to the at least one terminal on a demand-basis and information identifying a predefined resource zone for receiving the optional system information in response to a request for the optional system information, wherein the essential system information is required to access a cell of the device, wherein the demand channel is a channel on which terminals send a request for requesting at least a part of the optional system information on the demand-basis to avoid periodic transmission of the optional system information, wherein the information identifying the predefined resource zone comprises at least one of a time resource or a frequency resource an identifier of one or more physical resource blocks (PRBs) for receiving the optional system information, wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal; and controller configured to, while monitoring demand channel, receive a request from the at least one terminal for at least a part of optional system information other than the essential system information, the transceiver being further configured to: broadcast an indicator in the predefined resource zone to indicate existence of the part of the optimal system information; and in response to receiving the request and on the demand-basis, broadcast the part of the optional system information in the predefined resource zone. ### Claim 11 (depends on 10) The device of claim 10, wherein the demand channel is a common channel shared by terminals in the cell. ### Claim 12 (depends on 10) The device of claim 10, wherein the transceiver is configured to broadcast the resource configuration of the demand channel and at least a part of the essential system information in an access information table (AIT). ### Claim 13 (depends on 10) The device of claim 10, wherein the transceiver is configured to: broadcast semi-static system information of the essential system information with a first period; and broadcast dynamic system information of the essential system information with a second period shorter than the first period, the dynamic system information including the resource configuration of the demand channel. ### Claim 14 (depends on 10) The device of claim 10, wherein the transceiver is further configured to broadcast a configuration of a resource zone with the essential system information, and wherein the transceiver is configured to broadcast the part of the optional system information in the resource zone. ### Claim 15 (depends on 10) The device of claim 10, wherein the transceiver is configured to broadcast the resource configuration of the demand channel as a part of the essential system information. ### Claim 16 (depends on 10) The device of claim 10, wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal. ### Claim 17 (depends on 10) The device of claim 10, wherein the controller is further configured to determine the resource configuration of the demand channel based on at least one of the following: beamforming of the device, or grouping of terminals in the cell. ### Claim 18 (depends on 10) The device of claim 10, wherein the controller is configured to monitor a sequence as the request, the sequence being common to a plurality of terminals in the cell. ### Claim 19 A method implemented by a terminal, comprising: receiving essential system information broadcast by a device at a base station of a cell of a cellular network, the essential system information comprising a resource configuration of a demand channel for requesting optional system information to be provided to the terminal on a demand-basis and information identifying a predefined resource zone for receiving the optional system information in response to a request for the optional system information, wherein the essential system information is required to access a cell of the device, wherein the demand channel is a channel for requesting at least a part of the optional system information on the demand-basis, wherein the information identifying the predefined resource zone comprises an identifier of one or more physical resource blocks (PRBs) for receiving the optional system information, wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal; sending, on the demand channel, a request for at least a part of optional system information other than the essential system information; and receiving an indicator broadcast in the predefined resource zone, the indicator indicating existence of the part of the optional system information and receiving, on the demand basis, the part of the optional system information broadcast in the predefined resource zone. ### Claim 20 (depends on 19) The method of claim 19, wherein the demand channel is a common channel shared by the terminal and one or more other terminals in the cell. ### Claim 21 (depends on 19) The method of claim 19, wherein the resource configuration of the demand channel and at least a part of the essential system information is received in an access information table (AIT). ### Claim 22 (depends on 19) The method of claim 19, wherein receiving the essential system information comprises: receiving semi-static system information of the essential system information with a first period; and receiving dynamic system information of the essential system information with a second period shorter than the first period, the dynamic system information including the resource configuration of the demand channel. ### Claim 23 (depends on 19) The method of claim 19, further comprising: receiving a configuration of a resource zone with the essential system information; wherein receiving the part of the optional system information comprises receiving the part of the optional system information in the resource zone. ### Claim 24 (depends on 19) The method of claim 19, wherein receiving essential system information and the resource configuration of the demand channel comprises: receiving the resource configuration of the demand channel as a part of the essential system information. ### Claim 25 (depends on 19) The method of claim 19, wherein the resource configuration of the demand channel is based on at least one of the following: beamforming of the device, or grouping of terminals in the cell. ### Claim 26 (depends on 19) The method of claim 19, wherein the request is associated with a sequence common to a plurality of terminals in the cell. ### Claim 27 A terminal, comprising: a receiver configured to receive essential system information broadcast by a device at a base station of a cell of a cellular network, the essential system information comprising a resource configuration of a demand channel for requesting optional system information to be provided to the terminal on a demand-basis and information identifying a predefined resource zone for receiving the optional system information in response to a request for the optional system information, wherein the essential system information is required to access a cell of the device, wherein the demand channel is a channel for requesting at least a part of the optional system information on the demand-basis, wherein the information identifying the predefined resource zone comprises an identifier of one or more physical resource blocks (PRBs) for receiving the optional system information, wherein the resource configuration of the demand channel includes at least one of the following: a period of the demand channel, a time offset with respect to a reference signal, or a frequency offset with respect to the reference signal; and a transmitter configured to send, on the demand channel, a request for at least a part of optional system information other than the essential system information; wherein the receiver is further configured to: receive an indicator broadcast in the predefined resource zone, the indicator indicating existence of the part of the optimal system information; and receive, on the demand-basis, the part of the optional system information broadcast in the predefined resource zone. ### Claim 28 (depends on 27) The terminal of claim 27, wherein the demand channel is a common channel shared by the terminal and one or more other terminals in the cell. ### Claim 29 (depends on 27) The terminal of claim 27, wherein the resource configuration of the demand channel and at least a part of the essential system information is received in an access information table (AIT). ### Claim 30 (depends on 27) The terminal of claim 27, wherein the receiver is configured to: receive semi-static system information of the essential system information with a first period; and receive dynamic system information of the essential system information with a second period shorter than the first period, the dynamic system information including the resource configuration of the demand channel. ### Claim 31 (depends on 27) The terminal of claim 27, wherein the receiver is further configured to: receive a configuration of a resource zone with the essential system information; and receive the part of the optional system information in the resource zone. ### Claim 32 (depends on 27) The terminal of claim 27, wherein the receiver is configured to receive the resource configuration of the demand channel as a part of the essential system information. ### Claim 33 (depends on 27) The terminal of claim 27, wherein the resource configuration of the demand channel is based on at least one of the following: beamforming of the device, or grouping of terminals in the cell. ### Claim 34 (depends on 27) The terminal of claim 27, wherein the request is associated with a sequence common to a plurality of terminals in the cell.