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2/17/2019 Interpretations of the Distribution System Service Based on the 802.11 Specification W. Steven Conner, Intel Corp. Tricci So, Nortel Networks.

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Presentation on theme: "2/17/2019 Interpretations of the Distribution System Service Based on the 802.11 Specification W. Steven Conner, Intel Corp. Tricci So, Nortel Networks."— Presentation transcript:

1 2/17/2019 Interpretations of the Distribution System Service Based on the Specification W. Steven Conner, Intel Corp. Tricci So, Nortel Networks Tyan-Shu Jou, Janusys Networks July 13, 2004 W.S. Conner, T. So, T.-S. Jou

2 2/17/2019 Objectives Describe the logical representation of Distribution System (DS) and Distribution System Service (DSS) According to the spec Clarify the functionality of the Distribution Service and the Integration Service and the role of the portal Provide logical data path examples for message delivery Discuss the impact of the existing logical definitions on new task groups such as TGr and TGs W.S. Conner, T. So, T.-S. Jou

3 Distribution System (DS)
2/17/2019 Distribution System (DS) “A system used to interconnect a set of BSSs and integrated LANs to create an ESS” (3.20) The “output” point of a DS can be a portal or an AP ( ) “IEEE explicitly does not specify details of DS implementations. Instead, IEEE specifies services” (5.3) Interpretation: the DS is defined by the services, not by the physical network(s) used to implement the DS W.S. Conner, T. So, T.-S. Jou

4 Distribution System Service (DSS)
2/17/2019 Distribution System Service (DSS) “The set of services provided by the DS that enable the MAC to transport MSDUs between stations that are not in direct communication with each other over a single instance of the wireless medium (WM).” (3.22) These services include: Transport of MSDUs between the access points (APs) of basic service sets (BSSs) within an extended service set (ESS) Transport of MSDUs between portals and BSSs within an ESS, and Transport of MSDUs between stations in the same BSS in cases where the MSDU has a multicast or broadcast destination address or where the destination is an individual address, but the station sending the MSDU chooses to involve DSS. DSS services: Association Disassociation Reassociation Distribution Integration Distribution of messages within a DS W.S. Conner, T. So, T.-S. Jou

5 Distribution of Messages within a DS
2/17/2019 Distribution of Messages within a DS Distribution Service: “It is the job of the distribution service to deliver the message within the DS in such a way that it arrives at the appropriate DS destination for the intended recipient” ( ) Integration Service: “The service that enables delivery of MSDUs between the DS and an existing, non-IEEE local area network (via a portal).” (3.29) “If the distribution service determines that the intended recipient of a message is a member of an integrated LAN, the “output” point of the DS would be a portal instead of an AP” ( ) “Messages that are distributed to a portal cause the DS to invoke the Integration function (conceptually after the distribution service). The integration function is responsible for accomplishing whatever is needed to deliver a message from the DSM to the integrated LAN media” ( ) W.S. Conner, T. So, T.-S. Jou

6 2/17/2019 Portal “The logical point at which MSDUs from a non-IEEE LAN enter the DS of an ESS.” (3.39) “A Bridge to an LAN shall connect to an Portal, which in turn connects to an Distribution System (DS). For the purpose of bridging, the service interface presented at the Portal is identical to the service interface presented at the MAC SAP. An instance of an Distribution System can be implemented from 802 LAN components STAs attach to the Distribution System via an Access Point (AP). A bridge shall not connect to an Independent BSS.” (802.1D-1998: MAC Bridges, 6.5.6: Support by IEEE Std ) 802.11 Access Point (AP) 802.x Bridge 802.11 Portal MSDU STA 802.11 Distribution System (DS) Non LAN Logical LAN W.S. Conner, T. So, T.-S. Jou

7 Interpretations on Portal and Integration Service
2/17/2019 Interpretations on Portal and Integration Service Portal: Interpretation: There can be zero or more portals in a DS and portals can be part of any device that provides integration between MSDUs and a non LAN (including AP devices that provide such an interface) Integration Service: Interpretation: Whether or not the Integration Service is required to be invoked for a particular message depends on the source and destination of the message. If both endpoints are within the DS, integration through a portal is not required (even though the Distribution Service may transport the message across a non LAN). If one endpoint is within the DS and one outside of the DS, integration through a portal is required. W.S. Conner, T. So, T.-S. Jou

8 Complete 802.11 Architecture
2/17/2019 Complete Architecture Figure 7 of IEEE W.S. Conner, T. So, T.-S. Jou

9 Logical View of Portal, DSS, BSS and ESS
2/17/2019 Logical View of Portal, DSS, BSS and ESS Non LAN Portal Integration Service Distribution System Services (DSS) Distribution Service Reassociation Reassociation Dissociation Association Dissociation Association 802.11 AP-2 802.11 AP-1 STA STA BSS-1 STA-X BSS-2 STA-Y Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

10 Inter-BSS Communication within the ESS
2/17/2019 Inter-BSS Communication within the ESS Non LAN Portal Integration Service Distribution System Services (DSS) Distribution Service Association Dissociation Reassociation Reassociation Association Dissociation 802.11 AP-1 802.11 AP-2 STA STA BSS-1 STA-X STA-Y BSS-2 Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

11 Intra-BSS STA-to-STA Communication within an ESS
2/17/2019 Intra-BSS STA-to-STA Communication within an ESS Non LAN Portal Integration Service Distribution System Services (DSS) Distribution Service Reassociation Association Dissociation Association Dissociation Reassociation 802.11 AP-1 802.11 AP-2 STA STA BSS-2 STA-Z BSS-1 STA-X STA-Y Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

12 Communication between an 802.11 LAN and Non-802.11 LAN
2/17/2019 Communication between an LAN and Non LAN Non LAN Portal Integration Service Distribution System Services (DSS) Distribution Service Reassociation Association Dissociation Association Dissociation Reassociation 802.11 AP-1 802.11 AP-2 STA STA BSS-1 STA-X BSS-2 STA-Y Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

13 Integrated DSS AP-Devices
2/17/2019 Integrated DSS AP-Devices IEEE , 5.2.4: . . . It is possible for one device to offer both the functions of an AP and a portal; this could be the case when a DS is implemented from IEEE 802 LAN components. Non LAN (e.g. 802.x LAN) 802.x MAC/PHY 802.x MAC/PHY 802.11 Portal 802.11 Portal Integration Service Integration Service Distribution System Distribution Service Distribution Service Association Dissociation Association Reassociation Dissociation Reassociation 802.11 AP- Device-1 802.11 AP- Device-2 STA STA MAC/PHY MAC/PHY MAC/PHY STA-Z MAC/PHY BSS-1 STA-X MAC/PHY BSS-2 STA-Y MAC/PHY Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

14 Logical AP Devices: Inter-BSS Communication within the ESS
2/17/2019 Logical AP Devices: Inter-BSS Communication within the ESS Non LAN (e.g LAN) 802.3 MAC/PHY 802.3 MAC/PHY 802.11 Portal 802.11 Portal Integration Service Integration Service Distribution System Services (DSS) Distribution System Distribution Service Distribution Service Dissociation Association Dissociation Association Reassociation Reassociation 802.11 AP- Device-1 802.11 AP- Device-2 STA STA MAC/PHY MAC/PHY MAC/PHY STA-Z MAC/PHY BSS-1 STA-X MAC/PHY BSS-2 STA-Y MAC/PHY Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

15 Logical AP Devices: Intra-BSS STA-to-STA Communication
2/17/2019 Logical AP Devices: Intra-BSS STA-to-STA Communication Non LAN (e.g LAN) 802.3 MAC/PHY 802.3 MAC/PHY 802.11 Portal 802.11 Portal Integration Service Integration Service Distribution System Services (DSS) Distribution System Distribution Service Distribution Service Association Dissociation Association Reassociation Dissociation Reassociation 802.11 AP- Device-1 802.11 AP- Device-2 STA STA MAC/PHY MAC/PHY MAC/PHY STA-Z MAC/PHY BSS-1 STA-X MAC/PHY BSS-2 STA-Y MAC/PHY Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

16 Logical AP Devices: Communication between an 802.11 and Non-802.11 LAN
2/17/2019 Logical AP Devices: Communication between an and Non LAN Non LAN (e.g LAN) 802.3 MAC/PHY 802.3 MAC/PHY 802.11 Portal 802.11 Portal Integration Service Integration Service Distribution System Services (DSS) Distribution System Distribution Service Distribution Service Association Dissociation Association Reassociation Dissociation Reassociation 802.11 AP- Device-1 802.11 AP- Device-2 STA STA MAC/PHY MAC/PHY MAC/PHY STA-Z MAC/PHY BSS-1 STA-X MAC/PHY BSS-2 STA-Y MAC/PHY Extended Service Set (ESS) W.S. Conner, T. So, T.-S. Jou

17 2/17/2019 Discussion The DS and DSS are defined logically to maximize implementation flexibility Distribution System (DS) is logically defined by Distribution System Service (DSS) and not by the physical network used to implemented the DS. The Distribution Service is responsible for delivering a message within the DS and the Integration Service enables delivery of a message between the DS and a non LAN through the portal. But… existing implementations do not always cleanly separate the different services of DSS Possible impact on new task groups such as TGr and TGs: Before creating new functionality, may need to clarify assumptions about DS and DSS beyond what is currently specified by (e.g. define a particular instance of DS or DSS) To maintain compatibility, how can TGr and TGs avoid conflicting assumptions? W.S. Conner, T. So, T.-S. Jou

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