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Basic TGad MAC Layer Proposals and Options for Coexistence

Basic TGad MAC Layer Proposals and Options for Coexistence. Authors:. Date: 2010-03-17. Abstract. We propose two MAC layer beacon interval structures for Infrastructure BSS operations and IBSS operations. We add options for coexistence between TGad network and another 60 GHz network.

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Basic TGad MAC Layer Proposals and Options for Coexistence

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  1. Basic TGad MAC Layer Proposals and Options for Coexistence Authors: Date: 2010-03-17

  2. Abstract • We propose two MAC layer beacon interval structures for Infrastructure BSS operations and IBSS operations. • We add options for coexistence between TGad network and another 60 GHz network. • Allow the TGad network to detect the other 60 GHz network. • Our scenario covers the case when both TGad network and another network are in operations and the other network move into the vicinity of the TGad network. • The other scenario which covers the case when the TGad network starts up in the vicinity of the other network is proposed in IEEE 802.11-09/1160r3.

  3. Sector 1 Sector 2 AP Stations Sector 3 Sector n AP with stations having n directions Infrastructure BSS

  4. TGad MAC Layer Beacon Interval Structure 1 … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Beacon Period Quasi-omni Beacon Period Quasi-omni Beacon Period Association CP (A-CP) Association CP (A-CP) Association CP (A-CP) CFP and regular sub-CP (RS-CP) in Direction #1 CFP and regular sub-CP (RS-CP) in Direction #1 CFP and regular sub-CP (RS-CP) in Direction #1 … … CFP and regular sub-CP (RS-CP) in Direction #n CFP and regular sub-CP (RS-CP) in Direction #n CFP for Dir. #1 CFP for Dir. #n RS-CP for Dir. #n Dir. #1 … Dir. #n A-CP for Dir. #1 … A-CP for Dir. #n RS-CP for Dir. #1 … Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively Association Sub-CPs Broadcast and multicast frames Broadcast and multicast frames RS-CP for Dir. #1 – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #1 - using directional HCCA MAC … RS-CP for Dir. #n – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #n - using directional HCCA MAC … Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs For Infrastructure BSS operation

  5. BP/ A-CP / CFPs / RS-CPs Quasi-omni Beacon Period Association CP (A-CP) CFP and regular sub-CP (RS-CP) in Direction #1 … CFP and regular sub-CP (RS-CP) in Direction #n • In the beacon, it is divided into three sections: quasi-omni beacon section, AP quasi-omni tracking section and sector training section. • The association contention period (A-CP) is used for devices to send association request commands to the AP. • The contention-free periods (CFPs) are used for broadcast or multicast packets. • The regular sub-contention periods (RS-CPs) are used for all other commands and data exchanges. • The CFPs and RS-CPs are divided according to the different directions.

  6. CFP / RS-CPs CFP for Dir. #1 CFP for Dir. #n RS-CP for Dir. #n BP Dir. #1 … BP Dir. #n A-CP Dir. #1 … A-CP Dir. #n RS-CP for Dir. #1 … • For the CFPs after the A-CP, broadcast and multicast frames can be transmitted directionally. • For the RS-CPs, a directional CSMA/CA MACenhanced distributed channel access (EDCA) can be used. • Can also have alternating RS-CPs and RS-Control Access Phase (CAP)s using directional EDCA MACs and a polling MAC like HCF controlled channel access (HCCA), respectively Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively Association Sub-CPs Broadcast and multicast frames Broadcast and multicast frames RS-CP for Dir. #1 – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #1 - using directional HCCA MAC … RS-CP for Dir. #n – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #n - using directional HCCA MAC … Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs

  7. TGad MAC Layer Beacon Interval Structure 2 … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Beacon Period Contention Period (Any Directional CSMA/CA MAC) Dir. #1 … Dir. #n For IBSS operation *Any of the directional CSMA/CA MAC in IEEE 802.11-09/0796r0 can be used in the contention period.

  8. … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Quiet Period Quasi-omni Reporting Period Quasi-omni Beacon Period Association CP (A-CP) CFP and regular sub-CP (RS-CP) in Direction #1 … CFP and regular sub-CP (RS-CP) in Direction #n … Dir. #n … Dir. #n … Dir. #n … CFP for Dir. #1 CFP for Dir. #n RS-CP for Dir. #n Dir. #1 Dir. #1 Dir. #1 AS-CP for Dir. #1 AS-CP for Dir. #n RS-CP for Dir. #1 … Association Sub-CPs Can also have alternating RS- CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively. Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively. Broadcast and multicast frames Broadcast and multicast frames Station #1 sensingreport … Station #m sensingreport RS-CP for Dir. #1 – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #1 - using directional HCCA MAC … RS-CP for Dir. #n – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #n - using directional HCCA MAC … Mini-slots for sensing reports by all stations in direction #1. Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs Options for Coexistence in Structure 1

  9. Main Additions for Coexistence (1/3) Quasi-omni Quiet Period Quasi-omni Reporting Period Quasi-omni Beacon Period Association CP (A-CP) CFP and regular sub-CP (RS-CP) in Direction #1 … CFP and regular sub-CP (RS-CP) in Direction #n • The main additions to the MAC layer beacon interval structure are the quasi-omni quiet period and the quasi-omni reporting period. • There are multiple sub-quiet periods within the Quiet Period in different directions. Each sub-quiet period is used by the AP or station to sense for the other 60GHz network in their particular direction out of the n possible directions. Example of collaborative multi-direction sensing in the quiet period

  10. Main Additions for Coexistence (2/3) • Note that the initial direction of sensing by each station should be in such a way that all stations in that sector cover different directions. • This can be assigned to the station by the AP when it associates with the AP. • Another way is to use the station’s MAC address and compute it, that is, (MAC address MOD n). • Thus, the AP and the stations are sensing collaboratively in multiple directions as whole during the quiet period. • There are also multiple mini-slots in the different directions for the stations to report their sensing outcomes.

  11. Main Additions for Coexistence (3/3) • The mini-slots in different direction can be dynamically assigned to stations by the AP when the stations associate with the AP in the A-CP and indicated in a new field in the quasi-omni beacon period in that direction. • The particular mini-slot for a station will be removed when the station disassociates from the AP. • The AP decides if the other 60 GHz network is present or not, based on the data fusion rules like OR-fusion rule, AND-fusion rule or Majority fusion rule.

  12. Alternate Option for Coexistence in Structure 1 … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Quiet Period Quasi-omni Beacon Period Association CP (A-CP) CFP and regular sub-CP (RS-CP) in Direction #1 … CFP and regular sub-CP (RS-CP) in Direction #n … Dir. #n … Dir. #n … CFP for Dir. #1 CFP for Dir. #n RS-CP for Dir. #n Dir. #1 Dir. #1 AS-CP for Dir. #1 AS-CP for Dir. #n RS-CP for Dir. #1 … Association Sub-CPs Can also have alternating RS- CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively. Can also have alternating RS-CPs and RS-CAPs using directional EDCA and HCCA MACs, respectively. Broadcast and multicast frames Broadcast and multicast frames RS-CP for Dir. #1 – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #1 - using directional HCCA MAC … RS-CP for Dir. #n – using directional CSMA/CA EDCA MAC RS-CAP for Dir. #n - using directional HCCA MAC … Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs Regular sub-CP(s) with EDCA-TXOPs and Regular sub-CAP(s) with HCCA-TXOPs

  13. Main Additions in the Alternate Option • The only addition to the MAC layer beacon interval structure is the quasi-omni quiet period. • There are multiple sub-quiet periods in the different directions for the AP and stations to sense for the other 60 GHz network as before. • However, the stations can report their sensing outcomes to the AP through directional EDCA MAC using CSMA/CA or through directional HCCA MAC in the RS-CAPs for different directions. • The AP then decides if the other 60 GHz network is present or not, based on the data fusion rules.

  14. Options for Coexistence in Structure 2 … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Quiet Period Quasi-omni Reporting Period Quasi-omni Beacon Period Contention Period (Any Directional CSMA/CA MAC) This option is similar to the coexistence in MAC structure 1, except that the association and setting up of the mini-slot for sensing reporting is done in the contention period using any directional CSMA/CA MAC as in IEEE 802.11-09/0796r0. … Dir. #n … Dir. #n … Dir. #n Dir. #1 Dir. #1 Dir. #1 Station #1 sensingreport … Station #m sensingreport Mini-slots for sensing reports by all stations in direction #1.

  15. Alternate Option for Coexistence in Structure 2 … … Beacon interval n-1 Beacon interval n Beacon interval n+1 Quasi-omni Quiet Period Quasi-omni Beacon Period Contention Period (Any Directional CSMA/CA MAC) … Dir. #n … Dir. #n Dir. #1 Dir. #1 Similarly, this option is similar to the alternate option for coexistence in MAC structure 1, except that data communication and sensing report by the stations to the AP or the station that sends out the beacon target transmission time (TBTT) are done in the contention period using any directional CSMA/CA MAC as in IEEE 802.11-09/0796r0.

  16. Summary • We propose two MAC layer beacon interval structures for Infrastructure BSS operations and IBSS operations. • We add options for coexistence with another 60 GHz network by detecting it. • The TGad network could then move to another band. • The options for coexistence cater for the case when the TGad network and another 60 GHz network, both in operations, come into contact. • These coexistence options can be used in every beacon interval, or once in a number of beacon intervals.

  17. References • 11-09-1160-03-00ad-proposed-evaluation methodology-additions • 11-09-0796-00-00contention-based directional MAC protocols: a survey • IEEE Std 802.15.3c™-2009 • ECMA-387

  18. Straw Poll • Do you think an optional feature that includes quiet period and reporting period for coexistence is worth further investigation within TGad? • Y: • N: • A: Slide 18 Slide 18

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