# US 2019/0174200 A1 · Method for providing ad-hoc broadcast service based on channel sharing and apparatus for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174200 A1 - Document ID: US20190174200A1 - Status: Published application - Kind: A1 - Application number: 16/210,961 - Filed: 2018-12-05 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Dong-Joon CHOI; Heung-Mook KIM; Sung-Ik PARK; Joon-Young JUNG; Yong-Seong CHO - Web page: https://patentgrep.com/patent/US20190174200A1 ## CPC - H04N 21/6112: {involving terrestrial transmission, e.g. DVB-T} - H04H 20/18: Arrangements for synchronising broadcast or distribution via plural systems - H04H 20/30: by a single channel - H04H 20/67: Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency - H04N 21/2383: Channel coding {or modulation} of digital bit-stream, e.g. QPSK modulation (arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002) - H04N 21/2385: Channel allocation (H04N21/266 takes precedence); Bandwidth allocation (H04N21/24 takes precedence {; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16}) - H04N 21/4305: {Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets (arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083)} - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed herein are a method for providing an ad-hoc broadcast service based on channel sharing and an apparatus for the same. The method is configured such that a master broadcast transmitter for providing an ad-hoc broadcast service receives a request to share a channel from a new broadcast transmitter, allocates one of multiple subframes, into which the transmission frame of any one broadcast channel corresponding to the ad-hoc broadcast service is divided, to the new broadcast transmitter, and controls the new broadcast transmitter in real time by performing synchronization with the new broadcast transmitter based on reference time information included in a control Physical Layer Pipe (PLP). ## Claims ### Claim 1 A method for providing ad-hoc broadcast services based on channel sharing, comprising: receiving, by a master broadcast transmitter for providing an ad-hoc broadcast service, a request to share a channel from a new broadcast transmitter; allocating, by the master broadcast transmitter, one of multiple subframes, into which a transmission frame of any one broadcast channel corresponding to the ad-hoc broadcast service is divided, to the new broadcast transmitter; and performing, by the master broadcast transmitter, synchronization with the new broadcast transmitter based on reference time information included in a control Physical Layer Pipe (PLP), thereby controlling the new broadcast transmitter in real time. ### Claim 2 (depends on 1) The method of claim 1, wherein allocating one of the multiple subframes comprises: when the transmission frame is an ATSC 3.0 frame, transmitting a bootstrap and a preamble to the new broadcast transmitter, thereby providing band allocation information corresponding to the subframe; and when the transmission frame is a DVB-T2 frame, transmitting a P1 symbol and a P2 symbol to the new broadcast transmitter, thereby providing band allocation information corresponding to the subframe. ### Claim 3 (depends on 2) The method of claim 2, further comprising: including the control PLP in a subframe for the master broadcast transmitter, but using a common PLP of the P2 symbol as the control PLP when the common PLP is capable of including the control PLP. ### Claim 4 (depends on 1) The method of claim 1, wherein the reference time information is set using a reference clock counter value in the master broadcast transmitter. ### Claim 5 (depends on 2) The method of claim 2, wherein: the reference time information corresponds to a time at which the bootstrap is transmitted or a time delayed for a preset time offset from the time at which the bootstrap is transmitted when the transmission frame is the ATSC 3.0 frame, and the reference time information corresponds to a time at which the P1 symbol is transmitted when the transmission frame is the DVB-T2 frame. ### Claim 6 (depends on 4) The method of claim 4, wherein controlling the new broadcast transmitter is configured to transmit the reference time information to the new broadcast transmitter using the control PLP such that the new broadcast transmitter corrects internal time information so as to match the reference time information. ### Claim 7 (depends on 1) The method of claim 1, wherein the multiple subframes are acquired by dividing the transmission frame using any one of Time-Division Multiple Access (TDMA) and Frequency-Division Multiple Access (FDMA). ### Claim 8 (depends on 2) The method of claim 2, wherein, when the transmission frame is the DVB-T2 frame, the multiple subframes correspond to at least one data symbol. ### Claim 9 A broadcast transmitter, comprising: a processor for receiving a request to share a channel from a new broadcast transmitter for providing an ad-hoc broadcast service, allocating one of multiple subframes, into which a transmission frame of any one broadcast channel corresponding to the ad-hoc broadcast service is divided, to the new broadcast transmitter, and controlling the new broadcast transmitter in real time by performing synchronization with the new broadcast transmitter based on reference time information included in a control Physical Layer Pipe (PLP); and memory for storing the reference time information and control information for sharing the any one broadcast channel. ### Claim 10 (depends on 9) The broadcast transmitter of claim 9, wherein the processor is configured to: provide band allocation information corresponding to the subframe by transmitting a bootstrap and a preamble to the new broadcast transmitter when the transmission frame is an ATSC 3.0 frame; and provide band allocation information corresponding to the subframe by transmitting a P1 symbol and a P2 symbol to the new broadcast transmitter when the transmission frame is a DVB-T2 frame. ### Claim 11 (depends on 10) The broadcast transmitter of claim 10, wherein the processor includes the control PLP in the subframe corresponding to the broadcast transmitter, but uses a common PLP of the P2 symbol as the control PLP when the common PLP is capable of including the control PLP. ### Claim 12 (depends on 9) The broadcast transmitter of claim 9, wherein the reference time information is set using a reference clock counter value in the broadcast transmitter. ### Claim 13 (depends on 10) The broadcast transmitter of claim 10, wherein: the reference time information corresponds to a time at which the bootstrap is transmitted or a time delayed for a preset time offset from the time at which the bootstrap is transmitted when the transmission frame is the ATSC 3.0 frame, and the reference time information corresponds to a time at which the P1 symbol is transmitted when the transmission frame is the DVB-T2 frame. ### Claim 14 (depends on 12) The broadcast transmitter of claim 12, wherein the processor transmits the reference time information to the new broadcast transmitter using the control PLP such that the new broadcast transmitter corrects internal time information so as to match the reference time information. ### Claim 15 (depends on 9) The broadcast transmitter of claim 9, wherein the multiple subframes are acquired by dividing the transmission frame using any one of Time-Division Multiple Access (TDMA) and Frequency-Division Multiple Access (FDMA). ### Claim 16 (depends on 10) The broadcast transmitter of claim 10, wherein, when the transmission frame is the DVB-T2 frame, the multiple subframes correspond to at least one data symbol.