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1 Project IEEE Broadband Wireless Access Working Group < Title Cognitive radio concepts or h Date Submitted Source(s) Mariana Goldhamer Alvarion Tel Aviv, 21 HaBarzel Street Israel Voice: Fax: mailto:marianna.goldhammer@alvarion.com Re: Abstract Purpose Notice Release Patent Policy and Procedures Call or Contributions, IEEE h Task Group on License-Exempt Coexistence, IEEE h-05/014 Propose cognitive radio signaling or coexistence with ad-hoc systems This document has been prepared to assist IEEE It is oered as a basis or discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in orm and content ater urther study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a ree, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modiications thereo, in the creation o an IEEE Standards publication; to copyright in the IEEE s name any IEEE Standards publication even though it may include portions o this contribution; and at the IEEE s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE The contributor is amiliar with the IEEE Patent Policy and Procedures < including the statement "IEEE standards may include the known use o patent(s), including patent applications, provided the IEEE receives assurance rom the patent holder or applicant with respect to patents essential or compliance with both mandatory and optional portions o the standard." Early disclosure to the Working Group o patent inormation that might be relevant to the standard is essential to reduce the possibility or delays in the development process and increase the likelihood that the drat publication will be approved or publication. Please notiy the Chair <mailto:chair@wirelessman.org> as early as possible, in written or electronic orm, i patented technology (or technology under patent application) might be incorporated into a drat standard being developed within the IEEE Working Group. The Chair will disclose this notiication via the IEEE web site < 1
2 Cognitive radio concepts or h Mariana Goldhamer Alvarion Overview The h uses the Coexistence Identiication Server concept and the Coexistence Protocol or separating the intererence. This approach needs: - An agreement between operators or using a Coexistence Identiication Server - The creation and maintenance o a Server. Supplementary, the Base Stations need to be provisioned with IP addresses, not being generally a problem or operator-like use o systems. However, or ad-hoc systems another approach should be provided, and this approach should work or dierent PHY modes. In continuation it is proposed a signaling method, usable or ad-hoc systems and or the coexistence o systems with other users in the same requency band. Proposed text or the Working Document: Ad-hoc systems - operating principles using Cognitive Radio signaling - Principles In order to reduce the intererence situations, in deployments in which may exist a combination o systems using a Coexistence Protocol and ad-hoc systems, the ad-hoc systems will apply the Adaptive Channel Selection procedures and use cognitive radio signaling procedures to interact with systems wising a Coexistence Protocol. The ad-hoc systems obtain a temporary Community registration status, that has to be renewed rom time to time. Registration The h pro-active cognitive radio approach deines signals and procedures or the reservation o the activity intervals and registration o ad-hoc systems. The operational procedures are described below: h Community registered systems, using a Coexistence Protocol, will reserve the MAC rame Tx/Rx intervals by using, during the MAC Frame N, cognitive signals to indicate the MAC Tx_start, MAC Tx_end, MAC Rx_start, MAC Rx_end. These signals are transmitted by Base Stations and Repeaters. The speciic MAC rame N is indicated in the BS data-base and these procedures will repeat ater N cogn MAC rames; - During the MAC rame N+1, cognitive signals will indicate the beginning and the end o Master sub-rames, by transmitting signals indicating by their transmission start the Tx_start, Tx_end, Rx_start, Rx_end or the speciic sub-rame; these signals are transmitted by Base Stations, Repeaters and those SSs which experiences intererence, at intervals equal with N cog MAC Frames; - During the MAC rame N+2, will be indicated the position o the time-slots, in each Master sub-rame, to be used starting with the MAC Frame N+3 or registration using cognitive signaling. The start o the Rx_slot signal will indicate the start o the slot. 2
3 - The start o the MAC rame N+4 is the start o a registration interval using the cognitive signaling; the registration interval has the duration o T cr_reg seconds ; - The ad-hoc transmitters shall use, during the MAC rame N+4, the marked slot or sending their radio signature. The radio signature will be used or the evaluation o the potential intererence during the Master slot, to systems which use the sub-rame as Master systems. An ad-hoc radio unit (BS, Repeater or SS) will send this signal using a random access mode or T cr_reg1 seconds, using the sub-rame intended or their regular transmission (BSs and SSs use dierent sub-rames or transmission). The ad-hoc transmitters will have to use the registration procedures every T ad_reg seconds. o Registration replay The radio units using the Master sub-rame will send a NACK signal, to be sent in a random mode during the next T cr_reg_ack seconds, i they appreciate that the ad-hoc transmitter will cause intererence. Typically, to a registration signal sent during a DL sub-rame, the NAK will be sent by one or more SSs, while to a registration signal sent during UL sub-rame, the NACK signal will be sent by a Base Station. The radio units using the Master subrame will send their response in random mode. The NACK signal indicates that the requesting ad-hoc device cannot use the speciic sub-rame, while using the requesting radio signature Same device may try again, i using a dierent radio signature (or example, lower power). Lack o response, or T cr_reg_ack seconds, indicates that the registration is accepted or transmission during the speciic sub-rame. Selection o suitable reception sub-rames An ad-hoc unit will ind his suitable reception sub-rames, by using the ACS and Registration process in a repetitive way, searching or a suitable operation requency. The practical intererence situations, with synchronized MAC Frames are BS-SS and SS-BS intererence. Assuming similar transmit powers, the above mentioned process will have as result inding Master sub-rames in which the path attenuation between interering units is maximal. Signaling procedures or Cognitive Radio applications Discussion The signaling procedures should use a PHY independent mode, with minimum overhead, and which will not require the deinition o a new PHY, but rather the reutilization o the existing PHY modes. The signals should be understood by systems operating with dierent channel bandwidths. Here down is proposed an energy-based signaling method. Such signaling system is used in DFS application, by deining signaling patterns that are repetitive in time-domain. However, the patterns in time domain reduce signiicantly the spectral eiciency. In order to keep the spectral eiciency high, the energy distribution in requency domain is more suitable. 3
4 Proposal For signaling and message exchange between an ad-hoc system and systems using a Coexistence Protocol, it is proposed to: - Split the narrowest channel to be used (as deined in Proiles) into 32 energy bins, as ollows: - For 256FFT, to 8 sub-carriers/bin - For 512 FFT, to 16 sub-carriers/bin - For 1024FFT, to 32 sub-carriers/bin - For 2048FFT, to 64 sub-carriers/bin. - Send an h MAC message, at a suitable rate, such that the MAC header will use 1 symbol and the data ieldmac PDU will use another symbol; the MAC header and the data ield will be built in such a way that the power distribution or dierent bins will be with at least 5dB higher or a bin marked in Table 1 with H than or bin marked with L. The data ield or both transmit and receive operations, taking into account possible FFT sizes, channel widths and the deined PHY modes, is deined in chap. t.b.d. The ollowing igures show the desired spectral density or cognitive signaling and the possible outcome o the MAC PDU approach, introducing some distortions in time or requency domain, but still detectable by non systems. BW=5M BW=10M BW=20M Figure 1 Desired spectral densities or dierent channel BWs BW=5MHz Figure 2 Obtainable spectral densities with MAC PDU approach 4
5 Due to the FFT guard sub-carriers, not all the bins are usable; we will use in continuation, rom the bins numbered 0 31, where the bin#0 corresponds to the lowest requency, only the bins In Table 1 were deined a number o cognitive signals, having low inter-correlation properties. The energy on the not-used bins can take any value, but not more than the energy on a bin marked with H. This tolerance will allow inding adequate data mapping or each PHY mode. Obviously, i the energy on not-used bins will be minimal, the detection process will be easier. Table 11 Cognitive signal deinition Bin number /Signal number (802.16h Cognitive MAC Header) H L L H H L L L H L 2 (Tx_start ) 3 (Rx_start or Rx_slot) 4 (Tx_end) 5 (Rx_end) 6 (NACK) L H L L H H L L L H H L H L L H H L L L L H L H L L H H L L L L H L H L L H H L L L L H L H L L H H 7 H L L L H L H L L H 8 L H H L L H L H L L 9 L L H H L L H L H L Conclusion The proposed Cognitive Radio procedures allow coexistence with systems, deployed in an ad-hoc mode. These procedures allow to any system, using the deined cognitive signaling, to identiy an h system and to avoid creating intererence or being interered by it. 5
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