Centralized contention and reservation request for QoS-driven wireless LANs
First Claim
1. A method for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the method comprising:
- in a time period that includes a contention-free period (CFP) and a contention period (CP) that is distinct from the CFP, sending a contention control (CC) frame from a point coordinator (PC) of the BSS only during the CFP; and
at the PC in a centralized contention interval (CCI) following the CC frame in the CFP, receiving a non-colliding reservation request (RR) frame from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI, the received RR frame indicating that the non-PC station sending the RR frame has at least one buffered data frame for transmission, wherein the CC frame sending step includes;
sending from the PC during the CFP, the CC frame containing a priority limit for a next CCI.
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Abstract
A method and a system is disclosed for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless local area network (WLAN). A contention control (CC) frame is sent from a point coordinator (PC) of the BSS during a contention-free period (CFP) of a superframe that includes the contention-free period (CFP) and a contention period (CP). The CC frame contains information relating to at least one of a priority limit for a next centralized contention interval (CCI), a length of the next CCI, a permission probability associated with the next CCI and information relating to a reservation request (RR) frame successfully received by the PC in a previous CCI. A non-colliding RR frame is then received at the PC in the CCI following the CC frame. The received RR frame is sent from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI after the CC frame. The RR frame indicates that the non-PC station sending the RR frame has at least one buffered data frame for transmission.
182 Citations
18 Claims
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1. A method for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the method comprising:
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in a time period that includes a contention-free period (CFP) and a contention period (CP) that is distinct from the CFP, sending a contention control (CC) frame from a point coordinator (PC) of the BSS only during the CFP; and at the PC in a centralized contention interval (CCI) following the CC frame in the CFP, receiving a non-colliding reservation request (RR) frame from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI, the received RR frame indicating that the non-PC station sending the RR frame has at least one buffered data frame for transmission, wherein the CC frame sending step includes; sending from the PC during the CFP, the CC frame containing a priority limit for a next CCI. - View Dependent Claims (2)
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3. A method for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the method comprising:
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in a time period that includes a contention-free period (CFP) and a contention period (CP) that is distinct from the CFP, sending a contention control (CC) frame from a point coordinator (PC) of the BSS only during the CFP; and at the PC in a centralized contention interval (CCI) following the CC frame in the CFP, receiving a non-colliding reservation request (RR) frame from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI, the received RR frame indicating that the non-PC station sending the RR frame has at least one buffered data frame for transmission, wherein the CC frame sending step includes; sending from the PC during the CFP, the CC frame containing a length of a next CCI. - View Dependent Claims (4)
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5. A method for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the method comprising:
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in a time period that includes a contention-free period (CFP) and a contention period (CP) that is distinct from the CFP, sending a contention control (CC) frame from a point coordinator (PC) of the BSS only during the CFP; and at the PC in a centralized contention interval (CCI) following the CC frame in the CFP, receiving a non-colliding reservation request (RR) frame from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI, the received RR frame indicating that the non-PC station sending the RR frame has at least one buffered data frame for transmission, wherein the CC frame sending step includes; sending from the PC during the CFP, the CC frame containing a permission probability (PP) associated with the next CCI. - View Dependent Claims (6, 7)
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8. A method for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the method comprising:
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in a time period that includes a contention-free period (CFP) and a contention period (CP) that is distinct from the CFP, sending a contention control (CC) frame from a point coordinator (PC) of the BSS only during the CFP; and at the PC in a centralized contention interval (CCI) following the CC frame in the CFP, receiving a non-colliding reservation request (RR) frame from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI, the received RR frame indicating that the non-PC station sending the RR frame has at least one buffered data frame for transmission, wherein the CC frame sending step includes; sending from the PC station during the CFP, the CC frame containing information relating to a reservation request (RR) frame successfully received by the PC in a previous CCI. - View Dependent Claims (9)
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10. A system for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the system comprising:
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a point coordinator (PC) of the BSS, configured to send a contention control (CC) frame only during a contention-free period (CFP) in a time period that includes the CFP and a contention period (CP) that is distinct from the CFP; and a non-PC station in the BSS, configured to send a non-colliding reservation request (RR) frame to the PC when at least one centralized contention opportunity (CCO) is available during a centralized contention interval (CCI) following the CC frame in the CFP, the received RR frame indicating that the non-PC station has at least one buffered data frame for transmission, wherein; the non-PC station is configured to send, during the CFP, the CC frame containing a priority limit for a next CCI. - View Dependent Claims (11)
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12. A system for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the system comprising:
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a point coordinator (PC) of the BSS, configured to send a contention control (CC) frame only during a contention-free period (CFP) in a time period that includes the CFP and a contention period (CP) that is distinct from the CFP; and a non-PC station in the BSS, configured to send a non-colliding reservation request (RR) frame to the PC when at least one centralized contention opportunity (CCO) is available during a centralized contention interval (CCI) following the CC frame in the CFP, the received RR frame indicating that the non-PC station has at least one buffered data frame for transmission, wherein; the non-PC station is configured to send, during the CFP, the CC frame containing a length of a next CCI. - View Dependent Claims (13)
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14. A system for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the system comprising:
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a point coordinator (PC) of the BSS, configured to send a contention control (CC) frame only during a contention-free period (CFP) in a time period that includes the CFP and a contention period (CP) that is distinct from the CFP; and a non-PC station in the BSS, configured to send a non-colliding reservation request (RR) frame to the PC when at least one centralized contention opportunity (CCO) is available during a centralized contention interval (CCI) following the CC frame in the CFP, the received RR frame indicating that the non-PC station has at least one buffered data frame for transmission, wherein; the non-PC station is configured to send, during the CFP, the CC frame containing a permission probability (PP) associated with a next CCI. - View Dependent Claims (15, 16)
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17. A system for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless network, the system comprising:
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a point coordinator (PC) of the BSS, configured to send a contention control (CC) frame only during a contention-free period (CFP) in a time period that includes the CFP and a contention period (CP) that is distinct from the CFP; and a non-PC station in the BSS, configured to send a non-colliding reservation request (RR) frame to the PC when at least one centralized contention opportunity (CCO) is available during a centralized contention interval (CCI) following the CC frame in the CFP, the received RR frame indicating that the non-PC station has at least one buffered data frame for transmission, wherein; the non-PC station is configured to send, during the CFP, the CC frame containing information relating to a reservation request (RR) frame successfully received by the PC in a previous CCI. - View Dependent Claims (18)
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Specification