IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0532748
(2003-10-10)
|
등록번호 |
US-7633946
(2009-12-24)
|
국제출원번호 |
PCT/IB03/004567
(2003-10-10)
|
§371/§102 date |
20050426
(20050426)
|
국제공개번호 |
WO04/036838
(2004-04-29)
|
발명자
/ 주소 |
- Pavon, Javier del Prado
- Nandagopalan, Sai Shankar
- Soomro, Amjad
|
출원인 / 주소 |
- Koninklijke Philips Electronics N.V.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
1 |
초록
▼
Disclosed is a method and system based on MAC frames for enabling a QAP to seamlessly operate between granting polls for upstream and sidestream traffic while sending downstream frames. The inventive scheduling method uses a minimum set of mandatory TSPEC parameters to generate a schedule, which pro
Disclosed is a method and system based on MAC frames for enabling a QAP to seamlessly operate between granting polls for upstream and sidestream traffic while sending downstream frames. The inventive scheduling method uses a minimum set of mandatory TSPEC parameters to generate a schedule, which provides minimum performance requirement in wireless local area networks (WLANs).
대표청구항
▼
The invention claimed is: 1. A method for scheduling a transmission of at least one data stream in a wireless communications network having at least one access point and at least one station, the method comprising: receiving by the at least one access point a request to send said at least one data
The invention claimed is: 1. A method for scheduling a transmission of at least one data stream in a wireless communications network having at least one access point and at least one station, the method comprising: receiving by the at least one access point a request to send said at least one data stream for transmission from the at least one station; granting by the at least one access point said request to send said at least one data stream; transmitting by the at least one station a medium access control (MAC) frame comprised of a set of parameters defining the characteristics of said at least one data stream; and calculating by the access point service and transmission times according to a schedule algorithm utilizing said parameters, wherein calculating the service and transmission times includes determining a Service Interval (SI) and a servicing time (TXOP) for said at least one data stream by: calculating a minimum interval of all Maximum Service Intervals for said at least one data stream, and calculating the SI by choosing a number that is lower than said calculated minimum interval and is a submultiple of a beacon interval. 2. The method of claim 1, wherein said schedule algorithm is operative to schedule the transmission of said at least one data stream at said calculated service and transmission times. 3. The method of claim 1, further comprising generating polling frames or downlink frames at said calculated service and transmission times for transmission of said at least one data stream. 4. The method of claim 1, wherein said at least one data stream is parameterized traffic stream. 5. The method of claim 1, wherein the parameters of said MAC frame include Mean Data Rate (ρi), Nominal MSDU Size (Li), and Maximum Service Interval or Delay Bound (Di). 6. The method of claim 1, wherein the determining said TXOP uses additional parameters: Transmission Rate (Ri), Size of Maximum MSDU (Mi), and Overheads in Time units (Oi). 7. A method for scheduling the transmission of a data stream in a wireless communications network having at least one access point (QAP) and at least one station (WSTA), the method comprising: determining, at said QAP, whether at least one data stream is originated from said at least one WSTA based on a MAC frame comprised of a set of parameters defining the characteristics of said at least data stream; computing service and transmission times, at said QAP, for servicing said at least one WSTA in accordance with a schedule algorithm utilizing said parameters, wherein computing the service and transmission times includes determining a Service Interval (SI) and a servicing time (TXOP) for said at least one data stream by calculating a minimum interval of all Maximum Service Intervals, and calculating the SI by choosing a number that is lower than said minimum interval and is a submultiple of a beacon interval; and transmitting, by said at least one WSTA, said at least one data stream at said computed service and transmission times. 8. The method of claim 7, wherein said at least one data stream is parameterized traffic stream. 9. The method of claim 7, wherein the parameters of said MAC frame include Mean Data Rate (ρi), Nominal MSDU Size (Li), and Maximum Service Interval or Delay Bound (Di). 10. The method of claim 7, wherein the determining said TXOP uses additional parameters: Transmission Rate (Ri), Size of Maximum MSDU (Mi), and Overheads in Time units (Oi). 11. A system for seamlessly granting polls for upstream and/or sidestream traffic while simultaneously sending downstream traffic from an access point (QAP) to at least one station (WSTA), the system comprising: a memory for storing a computer-readable code; and a processor operatively coupled to said memory, said processor being configured to: (1) receive by said QAP a request to send at least one data stream for transmission from the at least one WSTA; (2) grant by said QAP said request to send said at least one data stream from said WSTA; (3) transmit, by said at least one WSTA, a MAC frame comprised of a set of parameters defining the characteristics of said at least one data stream; and (4) calculate, by said QAP, service and transmission times according to a schedule algorithm for servicing said at least one WSTA utilizing said parameters, wherein said processor calculates the service and transmission times by determining a Service Interval (SI) and a servicing time (TXOP) for said at least one data stream by calculating a minimum interval of all Maximum Service Intervals for said at least one data stream, and calculating the SI by choosing a number that is lower than said calculated minimum interval and is a submultiple of a beacon interval. 12. The system of claim 11, wherein the parameters of said MAC frame includes: Mean Data Rate (ρi), Nominal MSDU Size (Li), and Maximum Service Interval or Delay Bound (Di). 13. A system for scheduling the transmission of a data stream in a wireless communications network having at least one access point (QAP) and at least one station (WSTA), the system comprising: means for determining, at said QAP, whether at least one data stream is originated from said at least one WSTA based on a MAC frame comprised of a set of parameters defining the characteristics of said at least one data stream; means for calculating service and transmission times, at said QAP, for servicing said at least one WSTA in accordance with a schedule algorithm utilizing said parameters, wherein the means for calculating the service and transmission times further comprises means for determining a Service Interval (SI) and a servicing time (TXOP) for said at least one data stream by calculating a minimum interval of all Maximum Service Intervals for said at least one data stream, and calculating the SI by choosing a number that is lower than said calculated minimum interval and is a submultiple of a beacon interval; and means for transmitting, by said at least one WSTA, said at least one data stream at said computed service and transmission times. 14. The system of claim 13, wherein the parameters of said MAC frame include Mean Data Rate (ρi), Nominal MSDU Size (Li), and Maximum Service Interval or Delay Bound (Di). 15. The system of claim 13, wherein the means for determining uses additional parameters: Transmission Rate (Ri), Size of Maximum MSDU (Mi), and Overheads in Time units (Oi).
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