Protection methods for wireless transmissions
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-005/00
H04W-072/12
H04W-074/08
H04W-084/12
출원번호
US-0291947
(2016-10-12)
등록번호
US-9667394
(2017-05-30)
발명자
/ 주소
Lee, Dae Won
Kwon, Young Hoon
Noh, Yujin
Moon, Sungho
Hedayat, Ahmad Reza
출원인 / 주소
NEWRACOM, INC.
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
A wireless device receives a Multi-User Request-To-Send (MU-RTS) frame, descrambles first scrambled data in the MU-RTS frame using a first scrambling sequence, generates second scrambled data using a second scrambling sequence, and transmits a Clear-to-Send (CTS) frame including the second scrambled
A wireless device receives a Multi-User Request-To-Send (MU-RTS) frame, descrambles first scrambled data in the MU-RTS frame using a first scrambling sequence, generates second scrambled data using a second scrambling sequence, and transmits a Clear-to-Send (CTS) frame including the second scrambled data in response to receiving the MU-RTS frame. The second scrambling sequence is an N-bit left cyclic shift of the first scrambling sequence. Another wireless device generates first scrambled data using a first scrambling sequence and transmits an MU-RTS frame including the first scrambled data. The wireless device receives a CTS frame transmitted in response to the MU-RTS frame, and descrambles second scrambled data in the CTS frame using a second scrambling sequence. The second scrambling sequence is an N-bit left cyclic shift of the first scrambling sequence. In either device, N may be 7, and lengths of the first and second scrambling sequences may be 127 bits.
대표청구항▼
1. A method performed by a wireless device, the method comprising: receiving a Multi-User Request-To-Send (MU-RTS) frame including first scrambled data;descrambling the first scrambled data included in the MU-RTS frame using a first scrambling sequence;generating second scrambled data by scrambling
1. A method performed by a wireless device, the method comprising: receiving a Multi-User Request-To-Send (MU-RTS) frame including first scrambled data;descrambling the first scrambled data included in the MU-RTS frame using a first scrambling sequence;generating second scrambled data by scrambling data for a clear to send (CTS) frame using a second scrambling sequence; andtransmitting the CTS frame in response to receiving the MU-RTS frame, the CTS frame including the second scrambled data,wherein for each ith bit SS[i] of the second scrambling sequence, i=0 . . . M−1, SS[i] is equal to FS[(i+K) modulo L], where FS[j] is a jth bit of the first scrambling sequence, K being a fixed integer greater than 1, M being equal to a size of the second scrambled data, and L being a repetitive length of the first scrambling sequence. 2. The method of claim 1, wherein the MU-RTS frame further includes first data immediately followed by the first scrambled data, and the method further comprising:generating the first scrambling sequence based on the first data. 3. The method of claim 2, wherein a size of the first data is equal to 7 bits. 4. The method of claim 1, wherein the CTS frame further includes second data immediately followed by the second scrambled data, wherein the second data is equal to foremost 7 bits of the first scrambling sequence. 5. The method of claim 1, wherein L is equal to 2 to the Kth power minus 1. 6. The method of claim 5, wherein K is equal to 7. 7. The method of claim 1, wherein the MU-RTS frame further includes first data immediately followed by the first scrambled data, and the method further comprising: generating the second scrambling sequence based on the first data. 8. The method of claim 7, wherein generating the second scrambling sequence comprises: generating the second scrambling sequence by using the first data as an initial state of a scrambler for scrambling the data for the CTS frame. 9. The method of claim 8, further comprising: providing, by a Physical (PHY) layer of the wireless device, the first data to a Medium Access Control (MAC) layer of the wireless device. 10. The method of claim 9, further comprising: providing, by a PHY layer of the wireless device, the first data to the MAC layer of the wireless device as a parameter of an receive vector (RXVECTOR). 11. The method of claim 10, wherein the first data correspond to a value of a scrambler initialization field in a Service field of the received MU-RTS frame prior to descrambling. 12. The method of claim 9, wherein generating the second scrambling sequence comprises: determining, by the PHY layer of the wireless device, whether the PHY layer receives an initial state value from the MAC layer of the wireless device; andgenerating, by the PHY layer of the wireless device, the second scrambling sequence by using the initial state value as the initial state of a scrambler, in response to determining that the PHY layer receives the initial state value from the MAC layer of the wireless device. 13. The method of claim 12, wherein generating the second scrambling sequence further comprises: generating, by the PHY layer of the wireless device, the initial state value, in response to determining that the PHY layer does not receive the initial state value from the MAC layer of the wireless device. 14. The method of claim 12, further comprising: receiving, by the PHY layer of the wireless device, the initial state value from the MAC layer of the wireless device as a parameter of a transmission vector (TXVECTOR). 15. A method performed by a wireless device, the method comprising: generating first scrambled data by scrambling data for a Multi-User Request-To-Send (MU-RTS) frame using a first scrambling sequence;transmitting the MU-RTS frame, the MU-RTS frame including the first scrambled data;receiving a CTS frame transmitted in response to the MU-RTS frame; anddescrambling second scrambled data included in the clear to send (CTS) frame using a second scrambling sequence,wherein for each ith bit SS[i] of the second scrambling sequence, i=0 . . . M−1, SS[i] is equal to FS[(i+K) modulo L], where FS[j] is a jth bit of the first scrambling sequence, K being a fixed integer greater than 1, M being equal to a size of the second scrambled data, and L being a repetitive length of the first scrambling sequence. 16. The method of claim 15, wherein the MU-RTS frame further includes first data immediately followed by the first scrambled data. 17. The method of claim 16, wherein a size of the first data is equal to 7 bits. 18. The method of claim 17, further comprising: generating the second scrambling sequence based on the first data. 19. The method of claim 15, wherein the CTS frame further includes second data immediately followed by the second scrambled data, wherein the second data is equal to foremost 7 bits of the first scrambling sequence. 20. The method of claim 15, wherein L is equal to 2 to the Kth power minus 1, and K is equal to 7.
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이 특허에 인용된 특허 (1)
Benveniste, Mathilde, Start-to-finish reservations in distributed MAC protocols for wireless LANs.
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