IEEE C802.16j-08/xxx
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Comments on local CID allocation mode
Date
Submitted
2008-01-14
Source(s)
Kanchei (Ken) Loa, Yi-Hsueh Tsai,
Yung-Ting Lee, Hua-Chiang Yin,
Shiann-Tsong Sheu, Youn-Tai Lee
Voice: +886-2-27399616
Fax: +886-2-23782328
loa@iii.org.tw
Institute for Information Industry
8F, No. 218, Sec. 2, Dunhua S. Rd.,
Taipei City 106, Taiwan
[add other co-authors here]
Re:
IEEE 802.16j-07/059: “IEEE 802.16 Working Group Letter Ballot Recirc #28a: Announcement”
Abstract
This contribution proposes modification on local CID allocation mode
Purpose
Text proposal for 802.16j Draft Document.
Notice
Release
Patent
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IEEE C802.16j-08/xxx
Comments on local CID allocation mode
Kanchei (Ken) Loa, Yi-Hsueh Tsai, Yung-Ting Lee, Hua-Chiang Yin, Shiann-Tsong Sheu, Youn-Tai Lee
Institute for Information Industry (III)
Introduction
In P802.16j/D2, a non-transparent RS operating in local CID allocation mode sends RNG-RSP locally to the SS
after receiving RNG-REQ. Since the MR-BS is excluded from the “Initial Ranging and Automatic Adjustments
(RNG)” phase, it cannot obtain the SS MAC address of the new coming SS. However, at the “Basic
Capabilities Negotiation (SBC)” phase, the MR-BS must request the setting of the SS security capability
support in the SBC-RSP message from the “backbone”, which needs the knowledge of the SS MAC address of
the new coming SS. Therefore, in order to handle the SBC-REQ message form the SS via the RS, the MR-BS is
requires to know the association between SS MAC address and basic CID, which is provided via STA-INFO
message sending by the RS.
There are two unresolved issues associated with sending the STA-INFO message.
1) If the RS sends STA-INFO right after sending the RNG-RSP and the T3 timer is expired because the RNGRSP is lost, then the SS must re-enter the network by starting a new initial ranging process. There is no
mechanism defined in p802.16j/D2 to deal with the “old” STA-INFO message at the MR-BS, which
represents no SS anymore.
2) Even though, the RS could send the STA-INFO message after receiving SBC-REQ from the SS to ensure
that the RNG-RSP had been received successfully by the SS. The STA-INFO could still be lost and causes
invalidating the follow-on SBC-REQ form the SS.
The simplest solution to resolve above problems relies on enforcing the MR-BS processing both the STA-INFO
and the SBC-REQ autonomously. Thus we propose the RS must relay the station information (i.e. SS MAC
Address and associated CID) in the SBC-REQ message from the MS to the MR-BS by replacing the STA-INFO
message with a “Station Information” TLV (see Figure 1).
MR-BS
RS
STA-INFO (MAC address)
SS
RNG-REQ
RNG-RSP
T3 Initial Ranging and Automatic Adjustments
RNG-REQ
RNG-RSP
T3
T9
Basic Capabilities Negotiation
(a) The SS can not successfully decode RNG-RSP form the RS
MR-BS
RS
SS
RNG-REQ
RNG-RSP
T3 Initial Ranging and Automatic Adjustments
T9
STA-INFO (MAC address)
SBC-REQ
SBC-REQ
T18
Basic Capabilities Negotiation
(b) The MR-BS can not successfully decode STA-INFO form the RS
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IEEE C802.16j-08/xxx
MR-BS
RS
SS
RNG-REQ
RNG-RSP
T3 Initial Ranging and Automatic Adjustments
T9
SBC-REQ (Station Info.)
SBC-RSP
SBC-REQ
T18
Basic Capabilities Negotiation
SBC-RSP
(c) Sending SBC-REQ with Station MAC address
Figure 1 Sending station information to the MR-BS
In order to facilitate the incorporation of this proposal into IEEE 802.16j standard, specific changes to the draft
standard P802.16j/D2 are listed below.
Spec changes
6.3.2.3.23 SS and RS basic capability request (SBC-REQ) message
[Insert the following text as indicated:]
The following parameter shall be included in the SBC-REQ message when the message is relayed from a SS to the MRBS by a non-transparent RS with a unique BSID under local CID allocation mode:
Station Information TLV (see 11.8.15)
11.8 SBC-REQ/RSP management message encodings
[Insert the following subclause as indicated:]
11.8.15 Station Information
Name
Station Information
Type (1 byte) Length
Value
TBA
10
Bit #0-#47: SS MAC address
Bit #48-#63: SS basic CID
Bit #64-#79: SS primary management CID
Scope
SBC-REQ
[Delete the following subclause:]
6.3.2.3.81 Station information (STA-INFO) message
6.3.9.16.4 RS operation parameters configuration
[Modified the following text in line 40 of page 105 as indicated.]
The CID allocation TLV in RS_Config-CMD is used for the MR-BS to allocate the management CID range to a
subordinate RS operating in the local CID allocation mode, which allows an RS to assign the pre-allocated
management CIDs to its subordinate stations. If the CID allocation TLV is included in the RS_Config-CMD
message, the RS shall assign the management CIDs that are assigned by the MR-BS to its subordinate stations
(MS or RS) in the RNG-RSP during initial ranging process. In addition, the RS may inform the MR-BS that a
new station (MS or RS) is ready to enter to the network using STA-INFO message. After assigning the basic
and primary management CID to an MS, the MS and MR-BS continue network entry process as described in the
6.3.9.7 through 6.3.9.13 using MS's management CIDs. The RS shall relay management messages between them.
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IEEE C802.16j-08/xxx
6.3.10.3.1.1 MR-BS and RS behavior during contention-based initial ranging
[Modified the following table in line 1 of page 119 as indicated.]
Table 205e—Ranging and automatic adjustments procedure in local CID allocation mode
[remove “STA-INFO” and “STA-ACK” in Table 205e]
[Delete the following figure as indicated (since it is the same as “Figure 101—Handle RNG-REQ (OFDMA
PHY only)” after removing “STA-INFO” and “STA-ACK”:]
Figure 115m—Handling RNG-REQ at a non-transparent RS with a unique BSID under local CID allocation
mode
4