Presentation is loading. Please wait.

Presentation is loading. Please wait.

HR-MS Neighbor Discovery in 802.16n Document Number: IEEE C802.16n-11/0021r2 Date Submitted: 2011-03-14. Source: Haiguang Wang, Hoang Anh Tuan, Jaya Shankar,

Similar presentations


Presentation on theme: "HR-MS Neighbor Discovery in 802.16n Document Number: IEEE C802.16n-11/0021r2 Date Submitted: 2011-03-14. Source: Haiguang Wang, Hoang Anh Tuan, Jaya Shankar,"— Presentation transcript:

1 HR-MS Neighbor Discovery in 802.16n Document Number: IEEE C802.16n-11/0021r2 Date Submitted: 2011-03-14. Source: Haiguang Wang, Hoang Anh Tuan, Jaya Shankar, Zhongding Lei, Shoukang Zheng, Yeow Wai Leong, Teo Joseph Chee Ming, Mar Choon Hock Voice:+65 6408 2256 Institution for Infocomm Research (I2R) E-mail:haiguang.wang@gmail.com 1 Fusionopolis Way, #21-01, Connexis (South Tower) Re: Call for contributions for 802.16n AWD Base Contribution: IEEE C802.16n-10/0021 Purpose: To discuss and adopt the proposed text in the 802.16n draft Text Notice: 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. Copyright Policy: The contributor is familiar with the IEEE-SA Copyright Policy. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and..html#6sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2 Introduction Section 6.1.3.3 of 802.16n SRD: –“HR-Network shall support neighbor and path discovery between HR- MSs as well as between HR-MS and HR-Network infrastructure stations” Neighbor discovery is one of the key enabling mechanisms for: –HR-MS direct communications (DCm) –HR-MS forwarding to network (FTN) –Path discovery & management

3 Usage Scenarios Registered HR-MSs discover each other HR-MS HR-BS HR-MS HR-BS HR-MS Outside-of-coverage HR-MSs discover network infrastructure

4 Neighbor Discovery for Registered HR-MSs (1/2) Basic design principles: –Centralized control: serving HR-BS/HR-RS schedules HR-MSs to broadcast predefined self-advertizing (PSA) signals so that other HR- MSs can try to detect and verify their neighbor relationship –Design reuse: PSA signal is ranging sequences defined in 802.16- 2009/802.16m –Low cost: serving HR-BS/HR-RS schedules neighbor discovery as and when needed, and for selected stations

5 Step 1: HR-BS schedules one or multiple HR-MSs to broadcast dedicated ranging sequences in dedicated ranging channels. Two HR-MSs may share the same ranging sequence or the same ranging channel, but not both. HR-BS also schedules some other HR-MSs to listen on those ranging channels for scheduled PSA signals. Step 2: Each HR-MS that is scheduled to listen for PSA signals shall determine what ranging sequences it can decode, together with estimations of time/freq offsets and signal strength. Step 3: Receiving HR-MSs report measurements to HR-BS. Step 4: HR-BS constructs neighbor topology and may request HR-MSs to carry out extra measurements. Neighbor Discovery for Registered HR-MSs (2/2)

6 Proposed Text 17.2.7.1 Neighbor Discovery for Registered HR-MSs For registered HR-MSs to discover each other, the serving HR-BS/HR-RS shall schedule some HR-MSs to broadcast predefined self-advertizing (PSA) signals so that other HR-MSs can attempt to receive and verify their neighbor relationship. The receiving HR-MSs shall report their measurements of PSA signals to the serving HR- BS/HR-RS. Based on the reported information, HR-BS/HR-RS may request the HR-MSs to carry out extra measurements so that HR-MS direct communications (DCm) and HR-MS forwarding to network (FTN) can be initiated. Ranging sequences shall be used as PSA signals. The process of ranging-based neighbor discovery for registered HR-MSs shall be carried out as follows: -The serving HR-BS/HR-RS schedules one or multiple registered HR-MSs to broadcast dedicated ranging sequences in dedicated ranging channels. Two HR-MSs may share the same ranging sequence or the same ranging channel, but not both. The ranging preambles and/or channels shall not overlap with those allocated for normal initial and periodic ranging. At the same time, the serving HR-BS/HR-RS also schedules some other HR- MSs to listen on those ranging channels scheduled for PSA signals. -Each HR-MS that is scheduled to receive PSA signals shall determine what ranging sequences it can properly decode, together with related information such as estimations of time/frequency offsets and signal strength. -The receiving HR-MSs then report their measurements to the serving HR-BS/HR-RS.

7 Neighbor Discovery during Coverage Extension Basic design principles: –Centralized control: serving HR-BS/HR-RS schedules a registered HR- MS to broadcast preamble so that out-of-coverage HR-MSs can scan, detect, and start network entry –Design reuse: using existing DL preambles and following similar network entry procedure of 16e/16m

8 Coverage Extension for 16e Procedure: –Serving HR-BS schedules a registered HR-MS to broadcast preamble, followed by network configuration information (NCI) –An outside-of-coverage HR-MS detects the preamble, reads NCI, and subsequently sends in ranging signal –The inside-of-coverage HR-MS assist the outside-of-coverage HR-MS to carry out network entry with HR-BS

9 Coverage Extension for 16m Procedure: –Similar to 16e, except that both PA & SA preambles are broadcasted at 2 nd and 3 rd frames by cell-edge HR-MSs

10 Proposed Text 17.2.7.2 HR-MS Discover Network Infrastructure (802.16-2009) To enable coverage extension, a serving HR-BS/HR-RS shall schedule some of its registered HR- MSs to transmit frame preamble, together with FCH and network configuration information (NCI), so that an outside-of-coverage HR-MS can detect and start network entry. The transmission of frame preamble, FCH, NCI, shall be scheduled at the end of uplink subframes and can be for two or three OFDMA symbol durations. In case two symbols are scheduled, one is used for preamble and another is used for FCH and network configuration information (NCI). In case three symbols are scheduled, the first symbol is used for TTG for other HR-MSs to switch their transceiver to receiving mode for neighbor discovery purpose. The HR-BS shall also schedule ranging opportunities in the following subframes so that the outside-of-coverage HR- MS can transmit ranging signals at the reserved location and start network entry. The transmission opportunity is dynamic and may not appear in every frame. The content of FCH and NCI is [TBD].

11 Proposed Text 17.3.7.2 HR-MS Discover Network Infrastructure (802.16m) To enable coverage extension, a serving HR-BS/HR-RS shall schedule some of its registered HR- MSs to transmit PA/SA preamble signals, together with network configuration information (NCI), so that an outside-of-coverage HR-MS can detect and start network entry. The registered HR-MS shall transmit PA preamble at the beginning of the 2 nd frame and SA preamble at the beginning of the 3 rd frame (of a super-frame). Any non-registered HR-MS scanning for DL preambles for possible network entry shall be able to differentiate between preambles transmitted by normal infrastructure stations (HR-BS/HR-RS) and those transmitted by a coverage-extending HR-MS. This is based on the [TBD] mechanism. After receiving the SA-preamble transmitted by a potential forwarding HR-MS, the out-of- coverage HR-MS shall also be able to determine where to look for the NCI. The mechanism to enable this is [TBD]. NCI message contains essential PHY/MAC configurations that are required for the out-of-coverage HR-MS to configure its transceiver and subsequently send a ranging signal toward the coverage-extending HR-MS. Upon receiving the ranging signal from the out-of-coverage HR-MS, the coverage-extending HR- MS shall assist this HR-MS to carry out subsequent adjustments and handshaking with the serving HR-BS/HR-RS. The process finishes when the out-of-coverage HR-MS becomes registered with the serving HR-BS/HR-RS.


Download ppt "HR-MS Neighbor Discovery in 802.16n Document Number: IEEE C802.16n-11/0021r2 Date Submitted: 2011-03-14. Source: Haiguang Wang, Hoang Anh Tuan, Jaya Shankar,"

Similar presentations


Ads by Google