[특허]Method and system for direct mode communication within a talkgroup

[미국특허] Method and system for direct mode communication within a talkgroup 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/00 H04W-004/08 H04L-005/00 H04W-072/04 H04W-076/00 H04W-084/08
출원번호	US-0505202 (2014-10-02)
등록번호	US-9578469 (2017-02-21)
발명자 / 주소	Ruelke, Charles R. Corke, Robert J. Logalbo, Bob
출원인 / 주소	MOTOROLA SOLUTIONS, INC.
인용정보	피인용 횟수 : 1 인용 특허 : 74

초록 ▼

A method and system for direct mode operation (DMO) of a talkgroup enables device to device (D2D) DMO operation leveraged from a Land Mobile Radio (LMR) system. The method includes scanning at a radio receiver a defined radio frequency spectrum; receiving at the radio receiver in the defined radio frequency spectrum a wake-up signal; identifying a talkgroup identifier in the wake-up signal, wherein the talkgroup identifier corresponds to a talkgroup being monitored by the radio receiver; in response to identifying the talkgroup identifier, decoding code sequences included in the wake-up signal; identifying in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission; and tuning the radio receiver to receive the DMO transmission at the center frequency and transmission bandwidth.

대표청구항 ▼

1. A method for receiving at a radio receiver a direct mode operation (DMO) transmission to a talkgroup, the method comprising: scanning at the radio receiver a defined radio frequency spectrum;receiving at the radio receiver in the defined radio frequency spectrum a wake-up signal;identifying a talkgroup identifier in the wake-up signal, wherein the talkgroup identifier corresponds to a talkgroup being monitored by the radio receiver;in response to identifying the talkgroup identifier, decoding code sequences received at the radio receiver and associated with the talkgroup identifier;identifying in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission;tuning the radio receiver to receive the DMO transmission at the center frequency and transmission bandwidth; andwherein the code sequences are Walsh code sequences and wherein decoding the code sequences comprises digital signal parallel processing of matched filters for Walsh sequence cross-correlation. 2. The method of claim 1, wherein identifying in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission comprises looking up an index of a code sequence in a predefined table, where the index lists at least one of: a) an amount of frequency between the center frequency of the DMO transmission and a current center frequency of the radio receiver; b) whether the amount of frequency should be added or subtracted to the current center frequency; and c) an occupied bandwidth of the DMO transmission. 3. The method of claim 1, wherein the defined radio frequency spectrum is defined by a plurality of contiguous resource blocks, and wherein the code sequences each correspond to a single resource block. 4. The method of claim 1, wherein a predetermined hang-time is appended to a termination of reception of the DMO transmission, thus enabling a response transmission having a same timing, bandwidth and center frequency of the DMO transmission. 5. The method of claim 1, wherein the DMO transmission comprises a data packet of a Long-Term Evolution (LTE) Physical Up-link signaling channel (PUSCH). 6. The method of claim 1, wherein the code sequences are included in the wake-up signal. 7. A method for transmitting from a radio transmitter a direct mode operation (DMO) transmission to a talkgroup, the method comprising: determining a required bandwidth for the DMO transmission in a defined radio frequency spectrum;identifying a range of contiguous resource blocks that are available for use in the defined radio frequency spectrum;transmitting a wake-up signal, wherein the wake-up signal comprises a talkgroup identifier;transmitting code sequences associated with the talkgroup identifier that identify both a center frequency and a transmission bandwidth corresponding to the range of contiguous resource blocks that are available for use in the defined radio frequency spectrum; andtransmitting the DMO transmission at the center frequency and transmission bandwidth. 8. The method of claim 7, wherein the DMO transmission comprises a data packet of a Long-Term Evolution (LTE) Physical Up-link signaling channel (PUSCH). 9. The method of claim 7, wherein the code sequences are Walsh code sequences. 10. A radio receiver for receiving a direct mode operation (DMO) transmission to a talkgroup, the radio receiver comprising: a receiver system including a protocol specific device to device (D2D) control system, wherein the receiver system and D2D control system are configured to: scan at the receiver system a defined radio frequency spectrum;receive at the receiver system in the defined radio frequency spectrum a wake-up signal;identify a talkgroup identifier in the wake-up signal, wherein the talkgroup identifier corresponds to a talkgroup being monitored by the receiver system;in response to identifying the talkgroup identifier, decode code sequences received at the receiver system and associated with the talkgroup identifier;identify in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission;tune the receiver system to receive the DMO transmission at the center frequency and transmission bandwidth; andwherein the code sequences are Walsh code sequences and wherein decoding the code sequences comprises digital signal parallel processing of matched filters for Walsh sequence cross-correlation. 11. The radio receiver of claim 10, wherein identifying in at least one of the code sequences both a center frequency and a transmission bandwidth of the DMO transmission comprises looking up an index of a code sequence in a predefined table, where the index lists at least one of: a) an amount of frequency between the center frequency of the DMO transmission and a current center frequency of the radio receiver; b) whether the amount of frequency should be added or subtracted to the current center frequency; and c) an occupied bandwidth of the DMO transmission. 12. The radio receiver of claim 10, wherein the defined radio frequency spectrum is defined by a plurality of contiguous resource blocks, and wherein the code sequences each correspond to a single resource block. 13. The radio receiver of claim 10, wherein a predetermined hang-time is appended to a termination of reception of the DMO transmission, thus enabling a response transmission having a same timing, bandwidth and center frequency of the DMO transmission. 14. The radio receiver of claim 10, wherein the DMO transmission comprises a data packet of a Long-Term Evolution (LTE) Physical Up-link signaling channel (PUSCH). 15. The radio receiver of claim 10, wherein the code sequences are included in the wake-up signal. 16. A radio transmitter for transmitting a direct mode operation (DMO) transmission to a talkgroup, the radio transmitter comprising: a transmitter system including a protocol specific device to device (D2D) control system, wherein the transmitter system and D2D control system are configured to: determine a required bandwidth for the DMO transmission in a defined radio frequency spectrum;identify a range of contiguous resource blocks that are available for use in the defined radio frequency spectrum;transmit a wake-up signal, wherein the wake-up signal comprises a talkgroup identifier;transmit code sequences associated with the talkgroup identifier that identify both a center frequency and a transmission bandwidth corresponding to the range of contiguous resource blocks that are available for use in the defined radio frequency spectrum; andtransmit the DMO transmission at the center frequency and transmission bandwidth.

이 특허에 인용된 특허 (74) 인용/피인용 타임라인 분석

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[미국특허] Method and system for direct mode communication within a talkgroup 원문보기

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[미국특허] Method and system for direct mode communication within a talkgroup 원문보기

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