Unified contention based period
View Patent ↗A unified contention based protocol is implemented in which a source station within a basic service set selects the protection methodology for data transmission on the communication medium. Utilizing EDCA as a medium access method and maintaining that each transmission opportunity has multiple slots, the source station is provided with the opportunity to select a protection methodology based on the protection environment, which enables transmission opportunity protection without direct PCP involvement.
1. A method for transmission opportunity protection in a basic service set (BSS) of a wireless network, comprising a personal independent BSS coordination point (PCP) for which there can be time periods when the PCP is not available to transmit messages between stations of the BSS, the method comprising:
using an Enhanced Distributed Channel Access (EDCA) method for medium access control within the BSS;
using multiple slots for transmission opportunities;
determining, by a source station within the BSS, the availability of the PCP for transmitting messages to a plurality of stations within the BSS for protection of a transmission opportunity;
responsive to the PCP being available, transmitting, by the source station a target request to send (TRTS) message to the PCP;
responding, by the PCP, to the TRTS with a target clear to send (TCTS) message to the plurality of stations within the BSS;
receiving at a destination station the TCTS message; and
transmitting data between the source station and the destination station during the transmission opportunity.
2. The method according to claim 1 wherein the TRTS includes address information regarding the source station, the PCP, and the destination station.
3. The method according to claim 1 wherein the TRTS includes an idle duration field.
4. The method according to claim 1 wherein the TCTS includes an idle duration field.
5. The method according to claim 1 wherein the PCP responds using a directional transmission.
6. The method according to claim 1 wherein non-source stations and non-destination stations remain idle during data transmission between the source station and the destination station.
7. A method for transmission opportunity protection in a basic service set (BSS) of a wireless network, comprising a personal independent BSS coordination point (PCP) for which there can be time periods when the PCP is not available to transmit messages between stations of the BSS, the method comprising:
using an Enhanced Distributed Channel Access (EDCA) method for medium access control within the BSS;
using multiple slots for transmission opportunities;
initiating, by a personal independent BSS coordination point (PCP), a transmission opportunity between a source station and a destination station of the BSS;
transmitting by the PCP a first target clear to send (TCTS) message to each of a plurality of stations within the BSS including the destination station and the source station;
transmitting by the PCP a target request to send (TRTS) message to the plurality of stations, including the destination station;
transmitting by the destination station, in response to the TRTS message, a second TCTS message to the PCP; and
transmitting data between the source station and the destination station during the transmission opportunity.
8. The method according to claim 7 wherein the TCTS messages include address information regarding the PCP, the source station, and the destination station.
9. The method according to claim 7 wherein the PCP transmits using an omnidirectional transmission.
10. The method according to claim 7 wherein the PCP transmits using a directional transmission.
11. The method according to claim 7 wherein non-source stations and non-destination stations remain idle during data transmission between the source station and the destination station.
12. A method for transmission opportunity protection in a basic service set (BSS) of a wireless network, comprising a personal independent BSS coordination point (PCP) for which there can be time periods when the PCP is not available to transmit messages between stations, the method comprising:
using an Enhanced Distributed Channel Access (EDCA) method for medium access control within the BSS;
using multiple slots for transmission opportunities;
determining, by a source station within the BSS, the availability of the PCP for transmitting to a plurality of stations within the BSS messages for protection of a transmission opportunity;
responsive to the PCP being unavailable, transmitting by the source station a request to send (RTS) message to each of a plurality of stations within the BSS;
transmitting, by a destination station, a CTS message to the source station after receiving the RTS message; and
transmitting data between the source station and the destination station during the transmission opportunity.
13. The method according to claim 12 wherein the source station uses an omnidirectional transmission to transmit the RTS message.
14. The method according to claim 12 wherein the source station uses a directional transmission to transmit the RTS message.
15. The method according to claim 12 further comprising transmitting, by the source station, a CTS message to each of the plurality of stations within the BSS responsive to a lack of the requirement by the destination station to reply with a CTS message.
16. The method according to claim 12 wherein nonsource stations and non-destination stations within the BSS remain idle during data transmission between the source station and the destination station.
17. The method according to claim 12 further comprising transmitting, by the destination station, a clear to send (CTS) message using a directional antenna to the source station after receiving a RTS message.
18. The method according to claim 12 wherein non-source stations and non-destination stations which receive RTS/CTS messages remain idle during data transmission between the source station and the destination station.