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EPD, Mixed BSSes, and Group RAs

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Presentation on theme: "EPD, Mixed BSSes, and Group RAs"— Presentation transcript:

1 EPD, Mixed BSSes, and Group RAs
September 2014 doc.: IEEE /0977r6 September 2014 EPD, Mixed BSSes, and Group RAs Date: Authors: Donald Eastlake, Huawei Donald Eastlake, Huawei

2 September 2014 doc.: IEEE /0977r6 September 2014 Abstract This presentation describes one way to resolve a number of intertwined ak (GLK) questions related to EPD versus LPD, mixes BSSes of GLK and non-GLK STAs, and Group Addresses RAs. Donald Eastlake, Huawei Donald Eastlake, Huawei

3 September 2014 doc.: IEEE /0977r6 September 2014 Capabilities GLK (General Link) stations indicate they are GLK by including a GLK Information Element (IE) in Beacons, Probe Requests and Responses, DMG Beacons, (Re)Association Requests and Responses, Mesh Peering Opens, Mesh Peering Confirms, and … (TDLS?). Capabilities/Options are indicated by bits/fields within the GLK IE, except that Support of EPD is indicated by Capability Information Field bit 13 and DMG Capability Information Field bit 62. Donald Eastlake, Huawei Donald Eastlake, Huawei

4 Pairwise STA Communications
September 2014 doc.: IEEE /0977r6 September 2014 Pairwise STA Communications IBSS, PBSS, Direct Link, Mesh Peer, and Individually Addressed AP ↔︎ non-AP MPDUs carry EPD MSDUs if both STAs support EPD and LPD MSDUs otherwise. GLK pairwise STA communications typically use the 4- address format but, when appropriate, such as when traffic is actually intended for the receiver, may use 3-addresses. Details on using 4-address format need to be added to draft. Donald Eastlake, Huawei Donald Eastlake, Huawei

5 September 2014 doc.: IEEE /0977r6 September 2014 Mixed BSSes A GLK AP may permit association of non-AP STAs regardless of their GLK or EPD support. GLK APs indicate their policies on this by two BSS membership selector values, indicating that support is required, one for GLK and one for EPD. Non-AP STAs attempting to associate in violation of the AP’s policy are rejected. The “Supported Rates” IE should be renamed the “Supported Rates and BSS Membership Selectors” IE. Support for EPD/GLK and EPD/GLK BSS Membership Selector policy must be static for the life of the BSS. A non-GLK AP doesn’t recognize GLK/EPD support indications and so is happy to associate with GLK/EPD non-AP STAs if such non-AP STAs want to associate with the non-GLK AP. Donald Eastlake, Huawei Donald Eastlake, Huawei

6 BSS membership selectors
September 2014 doc.: IEEE /0977r6 September 2014 BSS membership selectors Existing REVmc-D3.0 “Table 8-86—BSS membership selector value encoding”: Proposed addition: Value Feature Interpretation 127 HT PHY Support for the mandatory features of Clause 20 (High Throughput (HT) PHY specification) is required in order to join the BSS that was the source of the Supported Rates element or Extended Supported Rates element containing this value. 126 VHT PHY Support for the mandatory features of Clause 22 (Very High Throughput (VHT) PHY specification) is required in order to join the BSS that was the source of the Supported Rates element or Extended Supported Rates element containing this value. Value Feature Interpretation 125 GLK Support for the mandatory features of Clause TBD is required in order to join the BSS that was the source of the Supported Rates element or Extended Supported Rates element containing this value. 124 EPD Support for EPD is required in order to join the BSS that was the source of the Supported Rates element or Extended Supported Rates element containing this value. Donald Eastlake, Huawei Donald Eastlake, Huawei

7 September 2014 doc.: IEEE /0977r6 September 2014 Group Addressed RAs A GLK AP transmitting a data MPDU with a Group Addressed RA intended for GLK non-AP STAs must use an RA constructed as shown on slide 9. It also must use the four address format in order to carry the true destination address. A GLK AP transmitting a non-data MPDU with a Group Addressed RA or one intended for non-GLK non-AP STAs uses existing RA types that do not include those constructed as shown on the following slide. If transmitting Group Addressed RA data MPDU to both GLK and non-GLK non-AP STAs, it must transmit twice. Donald Eastlake, Huawei Donald Eastlake, Huawei

8 September 2014 doc.: IEEE /0977r6 September 2014 Group Addressed RAs An AP that requires all associated STAs to support EPD, as indicated by requiring EPD support in its Supported Rates and BSS Membership Selectors IE, must use EPD for all MSDUs in MPDUs with Group Addressed RAs. If an AP does not require EPD support by associated STAs, it must use LPD for all MSDUs in MPDUs with Group Addressed RAs. (EPD for individually addresses MPDUs is covered by an earlier slide.) Donald Eastlake, Huawei Donald Eastlake, Huawei

9 September 2014 doc.: IEEE /0977r6 September 2014 GLK Group RA Addresses All data MPDUs sent by GLK APs to GLK STAs with a Group Addressed RA use an RA constructed with a new TBD OUI. The lower 24 bits have additional information, including sub-setting. Optionally, there would be support for a larger amount of sub-setting information in the data portion of the frame. GLK non-AP STAs ignore data MPDUs with a Group Addressed RA not formed as above, that is, where the RA has a different upper 24 bits. 0b0XXXXXX01 0xXXXX 24 bits Donald Eastlake, Huawei Donald Eastlake, Huawei

10 September 2014 doc.: IEEE /0977r6 September 2014 Example Bit Encoding Lower 24 bits of constructed Group Addressed RAs could be as follows: For type zero, the 22 bits indicate the receivers. Either Bit numbers are assigned at association time or AIDs are restricted and bit n represents AID 1000+n or something. (Don’t want to use low numbered AIDS due to Multiple BSSID feature use of them.) 2 bit type 22 bits Donald Eastlake, Huawei Donald Eastlake, Huawei

11 September 2014 doc.: IEEE /0977r6 September 2014 Questions What about OCB (Outside the Context of a BSS) operation? Not clear how to decide between EPD and LPB, for example, as there is generally no negotiation/association/peering phase… There are “relay” features in ad-2012 and in ah (Draft D2.0). How do these in interact with GLK four address format, etc.? What does it mean if an AP claims not to support EPD but requires EPD for non-AP STAs to associate? What if the Capability Information and DMG Capability Information EPD bits differ? Should “Ethertype” 0xAAAA (= SNAP SAP) be reserved? Other questions? Donald Eastlake, Huawei Donald Eastlake, Huawei

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