--- 1/draft-ietf-opsawg-capwap-extension-04.txt 2014-10-27 04:15:51.631341128 -0700 +++ 2/draft-ietf-opsawg-capwap-extension-05.txt 2014-10-27 04:15:51.663341919 -0700 @@ -1,20 +1,21 @@ + OPSAWG Y. Chen Internet-Draft D. Liu Updates: 5416 (if approved) H. Deng Intended status: Standards Track China Mobile -Expires: Nov 10, 2014 Lei. Zhu +Expires: April 26, 2015 Lei. Zhu Huawei - May 10, 2014 + October 27, 2014 CAPWAP Extension for 802.11n and Power/channel Autoconfiguration - draft-ietf-opsawg-capwap-extension-04 + draft-ietf-opsawg-capwap-extension-05 Abstract The CAPWAP binding for 802.11 is specified by RFC5416 and it was based on IEEE 802-11.2007 standard. Several new amendments of 802.11 have been published since RFC5416 was published in 2009. 802.11n is one of those amendments and it has been widely used in real deployment. This document extends the CAPWAP binding for 802.11 to support 802.11n and also defines a power and channel auto configuration extension. @@ -27,21 +28,21 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." - This Internet-Draft will expire on September 20, 2014. + This Internet-Draft will expire on April 26, 2015. Copyright Notice Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents @@ -56,36 +57,36 @@ 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. CAPWAP 802.11n Support . . . . . . . . . . . . . . . . . . . 3 3.1. CAPWAP Extension for 802.11n Support . . . . . . . . . . 4 3.1.1. 802.11n Radio Capability Information . . . . . . . . 4 3.1.2. 802.11n Radio Configuration Message Element . . . . . 4 3.1.3. 802.11n Station Information . . . . . . . . . . . . . 6 4. Power and Channel Autoconfiguration . . . . . . . . . . . . . 7 4.1. Channel Autoconfiguration When WTP Power On . . . . . . . 7 4.2. Power Configuration When WTP Power On . . . . . . . . . . 8 - 4.3. Channel/Power Auto Adjusment . . . . . . . . . . . . . . 8 + 4.3. Channel/Power Auto Adjustment . . . . . . . . . . . . . . 8 4.3.1. IEEE 802.11 Scan Parameters Message Element . . . . . 9 - 4.3.2. IEEE 802.11 Channel Bind Message Element . . . . . . 11 + 4.3.2. IEEE 802.11 Scan Channel Bind Message Element . . . . 11 4.3.3. IEEE 802.11 Channel Scan Report . . . . . . . . . . . 12 - 4.3.4. IEEE 802.11 Neighbor WTP Report . . . . . . . . . . . 14 + 4.3.4. IEEE 802.11 WTP Neighbor Report . . . . . . . . . . . 14 5. Security Considerations . . . . . . . . . . . . . . . . . . . 15 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 15 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 16 9. Normative References . . . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17 1. Introduction - The 802.11-2009 [IEEE 802.11n.2009] standard was published in 2009 as - an amendment to the IEEE 802.11-2007 standard to improve network + IEEE Std 802.11n[TM]-2009 [IEEE 802.11n.2009] was published in 2009 + as an amendment to the IEEE 802.11-2007 standard to improve network throughput. The maximum data rate increases to 600Mbps. In the physical layer, 802.11n uses Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input/Multiple Output (MIMO) to achieve the high throughput. 802.11n uses multiple antennas to form an antenna array which can be dynamically adjusted to improve the signal strength and extend the coverage. Capabilities of 802.11n such as radio capability, radio configuration and station information need to be supported by CAPWAP control messages. The necessary extensions for this purpose are introduced @@ -126,22 +127,22 @@ scale deployment scenario, the operator needs to use 20MHz channel configuration in the 2.4GHz band to allow more non-overlapping channels. In the MAC layer, a new feature of 802.11n is Short Guard Interval(GI). 802.11a/g uses an 800ns guard interval between the adjacent information symbols. In 802.11n, the GI can be configured to 400nm under good wireless conditions. Another feature in the 802.11 MAC layer is Block ACK. 802.11n can use - one ACK frame to acknowledge several MAC Protocol Data Unit (MPDU) - receiving events. + one ACK frame to acknowledge receipt of several MAC Protocol Data + Units (MPDUs). CAPWAP needs to be extended to support the above new 802.11n features. CAPWAP should allow the access controller to know the supported 802.11n features and the access controller should be able to configure the different channel binding modes. This document defines extensions of the CAPWAP 802.11 binding to support 802.11n features. 3.1. CAPWAP Extension for 802.11n Support @@ -189,22 +190,22 @@ Radio ID: An 8-bit value representing the radio, whose value is between one (1) and 31. S bit: A-MSDU configuration: Enable/disable Aggregate MAC Service Data Unit (A-MSDU). Set to 0 if disabled. Set to 1 if enabled. P bit: A-MPDU configuration: Enable/disable Aggregate MAC Protocol Data Unit (A-MPDU). Set to 0 if disabled. Set to 1 if enabled. N bit: 11n Only configuration: Whether to allow only 11n user access. - Set to 0 if non-802.11n user access is allowed. Set to 1 if - non-802.11n user access is not allowed. + Set to 0 if non-802.11n user access is allowed. Set to 1 if non- + 802.11n user access is not allowed. G bit: Short GI configuration: Set to 0 if Short Guard Interval is disabled. Set to 1 if enabled. B bit: Bandwidth binding mode configuration: Set to 0 if 40MHz binding mode. Set to 1 if 20MHz binding mode. Maximum supported MCS: Maximum Modulation and Coding Scheme (MCS) index. It indicates the maximum MCS index that the WTP or the STA can support. @@ -337,75 +338,77 @@ The IEEE 802.11 Tx Power message element defined in section 6.18 of [RFC5416] is used by the AC to control the transmission power of the WTP. The 802.11 Tx Power information element is carried in the Configure Status Response message or in the Configure Update Request message. 4.3. Channel/Power Auto Adjustment The Channel Scan Procedure is illustrated by the figure 4. - WTP Configure Status Req AC + WTP Configure Status Reqest AC -------------------------------------------------------> Configure Status Res(Scan Parameter Message Element, Channel Bind Message Element) <------------------------------------------------------ or WTP AC Configure Update Req(Scan Parameter Message Element, Channel Bind Message Element ) <----------------------------------------------------- - Configure Update Res + Configure Update Response -----------------------------------------------------> Figure 4: Channel Scan Procedure The WTP has two work modes: normal mode and scan only mode. In normal mode, the WTP can provide service for station access and scan channels at the same time. Whether the WTP will scan a given set of channels is determined by the Max Cycles field in the IEEE 802.11 - Channel Bind message element defined in Section 5.2. When this field - is set to 0, the WTP will not scan the channel. If this field is set - to 255, the WTP will scan the channel continuously. The type of the - scan is determined by the Scan Type field. With the passive scan - type, the WTP monitors the air interface, using the received beacon - frames to determine the nearby WTPs. With the active scan type, the - WTP will send a probe message and receive probe response messages. + Channel Bind message element defined in Section 4.3.2. When this + field is set to 0, the WTP will not scan the channel. If this field + is set to 255, the WTP will scan the channel continuously. The type + of the scan is determined by the Scan Type field. With the passive + scan type, the WTP monitors the air interface, using the received + beacon frames to determine the nearby WTPs. With the active scan + type, the WTP will send a probe message and receive probe response + messages. In this case, the WTP may need to operate in station mode + which means it is not a WTP function only device, it also has part of + station function. - In the normal scan mode, the WTP behaviour is controlled by three - parameters: PrimeChlSrvTime, OnChannelScanTIme, and - OffChannelScnTIme. These are provided by the IEEE 802.11 Scan - Parameters message element defined in Section 5.1. The WTP will - provide access service for stations for the duration given by - PrimeChlSrvTime. It then scans the working channel for the duration - given by OnChannelScnTime. It returns to servicing station access - requests on the working channel for another period of length - PrimeChlSrvTime, then moves to a different channel and scans it for - duration OffChannelScnTIme. It repeats this cycle, scanning a new - non-working channel each time, until all the channels have been - scanned. + In normal mode, the WTP behaviour is controlled by three parameters: + PrimeChlSrvTime, OnChannelScanTIme, and OffChannelScnTIme. These are + provided by the IEEE 802.11 Scan Parameters message element defined + in Section 4.3.1. The WTP will provide access service for stations + for the duration given by PrimeChlSrvTime. It then scans the working + channel for the duration given by OnChannelScnTime. It returns to + servicing station access requests on the working channel for another + period of length PrimeChlSrvTime, then moves to a different channel + and scans it for duration OffChannelScnTime. It repeats this cycle, + scanning a new non-working channel each time, until all the channels + have been scanned. When the WTP works in scan only mode, it does not distinguish between the working channel and scan channel. Every channel's scan duration will be OffChannelScnTime and PrimeChlSrvTime and OnChannelScanTime MUST be set to 0. As shown in Figure 4, the AC can control the scan behaviour at the WTP by including the IEEE 802.11 Scan Parameters and IEEE 802.11 Channel Bind message elements in a Configure Status Response or WTP Configure Update Request message. Scan Report. After completing its scan, the WTP MAY send the scan report to the AC using a WTP Event Request message. The scan report information is carried in the IEEE 802.11 Channel Scan Report message - element (Section 5.3) and an instance of the IEEE 802.11 Information - Element message element carrying a copy of theIEEE 802.11 Neighbor - WTP Report information element (Section 5.4). + element (Section 4.3.3) and an instance of the IEEE 802.11 + Information Element message element carrying a copy of theIEEE 802.11 + Neighbor WTP Report information element (Section 4.3.4). 4.3.1. IEEE 802.11 Scan Parameters Message Element The format of the IEEE 802.11 Scan Parameters Message Element is as shown in Figure 5: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Radio ID |M|S|L|D| | Report Time | @@ -417,68 +420,68 @@ Figure 5: IEEE 802.11 Scan Parameters Message Element Type: TBD3 for IEEE 802.11 Scan Parameters Message Element. Length: 10. Radio ID: An 8-bit value representing the radio, whose value is between one (1) and 31. - M bit: Work mode of the WTP. 0:normal mode. 1: monitor only mode, no + M bit: Work mode of the WTP. 0:normal mode. 1: scan only mode, no service is provided in this mode. S bit: Scan Type: 0: active scan; 1: passive scan. L bit: L=1: Open Load Balance Scan. L=0: Disable Load Balance Scan. D bit: D=1: Open Rogue WTP detection scan. D=0: Disable Rouge WTP detection scan. Report Time: Channel quality report time (unit: second). PrimeChlSrvTime: Service time (unit: millisecond) on the working scan channel. This segment is invalid(set to 0) when WTP oper mode is set to 1. The maximum value of this segment is 10000, the minimum value of this segment is 5000, the default value is 5000. On Channel ScanTime: The scan time (unit: millisecond) of the working - channel. When the WTP oper mode is set to 2, this segment is - invalid(set to 0). The maximum value of this segment is 120, the - minimum value of this segment is 60, the default value is 60. + channel. When the M bit is set to 1, this segment is invalid(set to + 0). The maximum value of this segment is 120, the minimum value of + this segment is 60, the default value is 60. Off Channel ScanTime: The scan time (unit: millisecond) of the working channel. When the WTP operating mode is set to 2, this segment MUST be set to 0. The maximum value of this segment is 120, the minimum value of this segment is 60, the default value is 60. -4.3.2. IEEE 802.11 Channel Bind Message Element +4.3.2. IEEE 802.11 Scan Channel Bind Message Element - The format of the IEEE 802.11 Channel Bind Message Element is as + The format of the IEEE 802.11 Scan Channel Bind Message Element is as follows: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 - +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - | Flag | Max Cycles |Channel Count |ScanChannelSet.| - +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Radio ID | Flag | Max Cycles |Channel Count |ScanChannelSet.| + +---------------+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - Figure 6: IEEE 802.11 Channel Bind Message Element + Figure 6: IEEE 802.11 Scan Channel Bind Message Element - Type: TBD4 for IEEE 802.11 Channel Bind Message Element. + Type: TBD4 for IEEE 802.11 Scan Channel Bind Message Element. - Length: 4. + Length: variable. Radio ID: An 8-bit value representing the radio, whose value is between one (1) and 31. - Flag: bitmap, reserved. + Flag: reserved. Max Cycles: Number of times the scanning cycle is repeated for the set of channels identified by this message element. 255 means continuous scan. Channel Count: The number of channels will be scanned. Scan Channel Set: identifies the members of the set of channels to which this message element instance applies. The format for each channel is as follows: @@ -490,34 +493,35 @@ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 7: Channel Information Format Channel ID: the channel ID of the channel which will be scanned. Flag: Bitmap, reserved for future use. 4.3.3. IEEE 802.11 Channel Scan Report - There are two types of scan report: Channel Scan Report and Neighbor - STA Report. Channel Scan Report is used to channel autoconfiguration - while Neighbor WTP Report is used to power autoconfiguration. The - WTP send the scan report to the AC through WTP Event Request message. - The information element that used to carry the scan report is Channel - Scan Report Message Element and Neighbor WTP Report Message Element. + There are two types of scan report: Channel Scan Report and WTP + Neighbor Report. Channel Scan Report is used to channel + autoconfiguration while WTP Neighbor Report is used to power + autoconfiguration. The WTP send the scan report to the AC through + WTP Event Request message. The information element that used to + carry the scan report is Channel Scan Report Message Element and WTP + Neighbor Report Message Element. The format of the IEEE 802.11 Channel Scan Report message element is in Figure 8. - 0 1 2 3 - 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + 0 1 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - | Radio ID | Report Count | Channel Scan Report | + | Radio ID | Report Count | Channel Scan Report ... | +---------------------------------------------------------------+ Figure 8: IEEE 802.11 Channel Scan Report Message Element Type: TBD5 for IEEE 802.11 Channel Scan Report message element. Length: >=29. Radio ID: An 8-bit value representing the radio, whose value is between one (1) and 31. @@ -543,92 +547,94 @@ Figure 9: Channel Scan Report Channel Number: The channel number. Radar Statistics: Whether detect radar signal in this channel. 0x00: detect radar signal. 0x01: no radar signal is detected. Mean Time: Channel measurement duration (ms). - Mean RSSI: The average signal strength of the scanned channel (dbm). + Mean RSSI: The average signal strength of the scanned channel + (dBm(2's complement)). Screen Packet Count: Received packet number. Neighbor Count: The neighbor number of this channel. - Mean Noise: the average noise on this channel. + Mean Noise: the average noise on this channel (dBm(2's complement)). Interference: The interference of the channel, including STA interference and WTP interference. - WTP Tx Occp: (The WTP sending duration time/Monitor time)*255. - The WTP sending duration time is the total sending time of - the WTP during the period of channel scan. + WTP Tx Occp: (The WTP transmission time/Monitor time)*255. The WTP + transmission time is the total sending time of the WTP during the + period of channel scan. - WTP Rx Occp: (The WTP receiving duration time/Monitor time)*255. - THe WTP receiving duration time is the total receiving time of - the WTP during the period of channel scan. + WTP Rx Occp: (The WTP receiving duration time/Monitor time)*255. THe + WTP receiving duration time is the total receiving time of the WTP + during the period of channel scan. Unknown Occp: (All other packet transmission time duration/Monitor time)*255. CRC Err Cnt: CRC err packet number. Decrypt Err Cnt: Decryption err packet number. Phy Err Cnt: Physical err packet number. Retrans Cnt: Retransmission packet number. + Note:The values of the above four count fields for a non-operational + channel can be ignored + 4.3.4. IEEE 802.11 WTP Neighbor Report 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - | Element ID | Length | - +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Radio ID | Reserved | Number of Neighbor Report | +---------------------------------------------------------------+ | Neighbor Infor... | +---------------------------------------------------------------+ Figure 10: WTP Neighbor Report TLV The definition of Neighbor info is as follows: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BSSID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BSSID | Channel Number | +---------------------------------------------------------------+ - | 2nd Offset | Mean RSSI | Sta Intf | AP Intf | + | 2nd Offset | Mean RSSI | Sta Occp | WTP Occp | +---------------------------------------------------------------+ Figure 11: Neighbor info BSSID: The BSSID of this neighbor WTP. Channel Number: The channel number of this WTP neighbor. 2nd channel offset: The auxiliary channel offset of this WTP. Mean RSSI: The average signal strength of this WTP (dbm). - Sta Intf: (The station air interface occupation time/Monitor - time)*255. The station air interface occupation time is the - air interface occupation time caused by the stations which are connected + Sta Occp: (The station air interface occupation time/Monitor + time)*255.The station air interface occupation time is the air + interface occupation time caused by the stations which are connected to this WTP. - AP Intf: (The WTP air interface occupation time/Monitor time)*255. + WTP Occp: (The WTP air interface occupation time/Monitor time)*255. The WTP air interface occupation time is the air interface occupation time caused by the WTP. 5. Security Considerations This document is based on RFC5415/RFC5416 and adds no new security considerations. 6. IANA Considerations @@ -637,43 +643,45 @@ [RFC5416]. The following IEEE 802.11 specific message element type need to be defined by IANA. TBD1: 802.11n Radio Configuration Message Element type value described in section 4.1.2. TBD2: 802.11n Station Message Element type value described in section 4.1.3. TBD3: 802.11 Scan Parameter Message Element type value described in - section 5.3.1. + section 4.3.1. TBD4: 802.11 Channel Bind Message Element type value described in - section 5.3.2. + section 4.3.2. TBD5: Channel Scan Report Message Element type value described in - section 5.3.3. + section 4.3.3. + + TBD6 entry for WTP Neighbor Report as descrbed in section 4.3.4 . 7. Contributors This draft is a joint effort from the following contributors: Gang Chen: China Mobile chengang@chinamobile.com - Naibao Zhou: China Mobile zhounaibao@chinamobile.com Chunju Shao: China Mobile shaochunju@chinamobile.com Hao Wang: Huawei3Come hwang@h3c.com Yakun Liu: AUTELAN liuyk@autelan.com Xiaobo Zhang: GBCOM + Xiaolong Yu: Ruijie Networks Song zhao: ZhiDaKang Communications Yiwen Mo: ZhongTai Networks Dorothy Stanley: dstanley1389@gmail.com Tom Taylor: tom.taylor.stds@gmail.com @@ -684,21 +692,22 @@ suggestions. The authors also thanks Dorothy Stanley and Tom Taylor for their review and useful comments. 9. Normative References [IEEE-802.11.2009] "IEEE Standard for Information technology - Telecommunications and information exchange between systems Local and metropolitan area networks - Specific requirements Part 11: Wireless LAN Medium Access Control - (MAC) and Physical Layer (PHY) Specifications", 2009. + (MAC) and Physical Layer (PHY) Specifications, + Enhancements for Higher Throughput (Amendment 5)", 2009. [IEEE-802.11.2012] "IEEE Standard for Information technology - Telecommunications and information exchange between systems Local and metropolitan area networks - Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", March 2012. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate