IEEE C802.16m-09/0611 Project IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16> Title Proposed AWD text for HO support for legacy system Date Submitted 2009-3-2 Source(s) Yang Liu, Liu.yang8@zte.com.cn mchion@zteusa.com Mary Chion, Hongyun Qu, ZTE Corporation Re: Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content Abstract This contribution proposes detail description on 16e to 16m HO operation Purpose To be discussed and adopted. Notice Release Patent Policy This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. 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Proposed AWD text for HO support for legacy system Introduction This contribution proposes text for the sections describing HO operation for legacy system support. Reference [1] IEEE 802.16m Amendment Working Document, IEEE 802.16m-08/050 Proposed Amendment Text The following text is proposed for inclusion in Section 15 of the IEEE 802.16m Amendment Working Document. -------------------------------------------------------- Text Start 15.2.x Handover 1 ------------------------------------------------------------ IEEE C802.16m-09/0611 15.2.x.1 Network topology acquisition 15.2.x.2 Handover Procedure 15.2.x.3 Handover supporting WirelessMAN-OFDMA Reference System The WirelessMAN-OFDMA Reference System/WirelessMAN-OFDMA Advanced System co-existing system consists of WirelessMAN-OFDMA Reference System and WirelessMAN-OFDMA Advanced System cells/sectors. An YBS advertises the system information for its neighbor YBSs and the LZones of its neighbor ABSs. An ABS advertises the system information for its neighbor YBSs in its both LZone and Mzone. It advertises the Lzones of its neighbor ABSs in its Lzone. It also advertises the system information for its neighbor ABSs in Mzone. The ABS may indicate its WirelessMAN-OFDMA Advanced capability and information in its LZone broadcast information (e.g. by the modified reserved bit of the FCH and the MAC version TLV). 15.2.x.3.1 Handover from a YBS to an ABS When a handover from a WirelessMAN-OFDMA Reference System to a WirelessMAN-OFDMA Advanced System is triggered for a YMS, the YMS handover is from the serving YBS to the LZone of the target ABS using WirelessMAN-OFDMA Reference System handover signaling and procedures as defined in 6.3.21.2. An AMS may handover from a YBS to an ABS with a zone switch method or a direct handover procedure. The details of zone switch and direct handover are described in 15.2.x.x.1 and 15.2.x.x.2, respectively. 15.2.x.3.1.1 Zone switch An AMS may handover from the serving YBS to the LZone of the target ABS using a WirelessMAN-OFDMA Reference System handover signaling and procedures, and switch to the MZone of the ABS after AMS entering LZone. The AMS may request or be directed by the ABS to switch from LZone to MZone during network entry to LZone of the ABS. The AMS may also request or be directed by the ABS to switch between LZone and MZone after network entry to the ABS. When zone switch is performed during network entry to the LZone of an ABS, the AMS sends a RNG-REQ message and receives the zone switch indication from the ABS in RNG-RSP message. The RNG-RSP message may include MZone information and allocation to AMS at MZone such as STIDs, FID when zone switching indication is included. Based on the Mzone information obtained from the RNG-RSP message, the AMS then performs necessary network re-entry procedure in the MZone. During zone switch process, the user data is transmitted in the LZone while the AMS performs zone switch procedure in the MZone. After zone switch completes, the AMS is only served in the MZone. 2 IEEE C802.16m-09/0611 YBS ABS LZone AMS ABS MZone MOB_HO_IND Initial Ranging code RNG-RSP Initial Ranging Finished RNG-REQ RNG-RSP with Mzone information and allocation Initial Ranging code RNG-RSP RNG-REQ RNG-RSP Figure HO-aa1 Zone Switch performed during network entry (from Lzone to Mzone) When zone switch is performed from LZone to MZone after network entry to the ABS, the zone switch initiation may be indicated by the ABS in LZone or by AMS through ranging request sent to the MZone. For ABS initiated zone switch operation from LZone to MZone, the ABS sends MOB_BSHO-REQ with zone switch indication to direct the AMS to switch to MZone. The MOB_BSHO-REQ shall include target MZone information and may include AMS assignments at MZone such STID, FID, etc. LZone AMS Zone Switch begins MZone MOB_BSHO-REQ(With a zone switch indication) HO_IND data transmission continues in the LZone until the connection in Mzone is built Initial Ranging code RNG-RSP RNG-REQ RNG-RSP Figure HO-aa2 Zone Switch initiated by ABS performed after network entry (from Lzone to Mzone) When zone switch is performed from MZone to LZone after network entry to the ABS, the zone switch may be 3 IEEE C802.16m-09/0611 initiated by the ABS using AAI-BSHO-CMD. During zone switch process, the user data is transmitted in the MZone while the AMS performs necessary 16e network re-entry procedures in the LZone. After zone switch completes, the AMS is only served in the LZone. LZone AMS MZone AAI-BSHO-CMD(With a zone switch indication) Zone Switch begins HO_IND data transmission continues in the MZone until the connection in LZone is built Initial Ranging code RNG-RSP RNG-REQ RNG-RSP Figure HO-aa3 Zone Switch initiated by ABS performed after network entry (from Mzone to LZone) 15.2.x.3.1.2 Direct handover An AMS may handover directly to the MZone of ABS or to the 16m only ABS. The AMS may scan all the possible channels without any pre-knowledge of neighboring ABS. After determining the target BS based on the information captured in the scan phase, the 16m MS will perform initial ranging for HO in the ABS. 15.2.x.3.2 Handover from an ABS to an YBS When an ABS to YBS handover is triggered for a YMS, the YMS handover is from LZone of the serving ABS to the target YBS as described in 6.3.21.2. When a an ABS to YBS handover is triggered for an AMS, the serving ABS and AMS perform handover execution as described in 15.2.x. The serving ABS performs context mapping and protocol inter-working from ABS to YBS system. Then the AMS perform network re-entry to target YBS as described in 6.3.21.2. -------------------------------------------------------- Text End 4 ------------------------------------------------------------