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Neighbor Setting Procedures

Neighbor Setting Procedures. Authors:. Date: 2011-01-03.

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Neighbor Setting Procedures

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  1. Neighbor Setting Procedures Authors: Date: 2011-01-03 Notice:This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Päivi Ruuska, Nokia

  2. Introduction In order to provide coexistence services to TVBDs, the coexistence system has to define which TVBDs have to coexist. Thus, in this presentation we describe procedures for neighbor setting. The intention is that a neighbor relationship is created between the TVBDs which cause interference: • neighbors if the interference is bi-directional • one-sided interferers if the interference is one-directional Coexistence system services are used for neighbor setting: • Neighbor discovery is provided by CDIS to CMs. • Neighbor inquiry, set, and remove are inter-CM neighbor management services. Päivi Ruuska, Nokia

  3. Neighbor setting procedures overview • Neighbor discovery – CDIS service • TVBDs which interfere each other may be served by different CMs. • CDIS calculates which TVBDs interfere each other, and provides candidate neighbor lists to the CMs. – CMs are required to provide some TVBD information for this calculation. • Neighbor inquiry – inter-CM neighbor management service • CMs serving candidate neighbors exchange more TVBD information. • Information exchanged in neighbor inquiry is used to validate that the TVBDs are capable of interfering, i.e. TVBDs are able to operate on same frequencies. • CM initiating the neighbor inquiry also uses the candidate neighbor information to evaluate whether candidate neighbor interferes TVBD and shall be set as neighbor/interferer. • Neighbor set – inter-CM neighbor management service • A neighbor relationship is created between TVBDs which are estimated to interfere. • Neighbor remove – inter-CM neighbor management service • The neighbor relationship is tear down between neighbors which no longer interfere. Päivi Ruuska, Nokia

  4. Neighbor Discovery • CDIS provides neighbor discovery service to CMs. CMs are required to provide up to date information of TVBDs to CDIS. • CM sends Neighbor_discovery_req to CDIS to update parameters of a TVBD and to request candidate neighbor list for the TVBD. • Parameters: geo-location, max TX power, operation environment (indoor/ outdoor), min SNR, directed antenna gain… • CDIS calculates the candidate neighbors to the TVBD and provides the candidate neighbor list to the requesting CM in Neighbor_discovery_rsp • Candidate neighbor: network which causes interference at the location of TVBD, or network at which location TVBD causes interference > noise floor +3dBm (see following pages). • Candidate neighbors may be reported in calculated interference level order, based on the interference level the candidate neighbors cause at the location of TVBD. • Interference direction is also indicated to CM: • Mutual neighbor – both cause interference at each other’s location. • One-sided interferer source – only candidate neighbor causes interference at location of TVBD. • One-sided interferer victim – only TVBD causes interference at location of candidate neighbor. Päivi Ruuska, Nokia

  5. Neighbor Discovery – interference calculation 1/3 • Target: to calculate a possibility for a mutualneighbor, one-sided interferer source or one-sided interferer victim cases. • Candidate neighbor calculation parameters: • Minimum SNR of the network for operation: SNRmin • Maximum transmission power: Ptxmax • Antenna gains: G(θ), θ is an angle to the direction of other device • Attenuation according to a propagation model: L(r), r is a distance • Defined non-aggregated interference level above the noise: Im • Noise level: N = F+No, F=noise figure, No=ambient noise Päivi Ruuska, Nokia

  6. Neighbor Discovery – interference calculation 2/3 Master of netA (location known in CDIS) r1’ Client of netA r2’ r2’’ Client of netB r1’’ Master of netB (location known in CDIS) • Calculation according to the figure on the right • Calculate max distance r1 for communication within both networks by solving r1 from the equation (units in dB): L(r1)=Ptxmax+G(θ)-SNRmin-N • Calculate max interfering distance r2 from the outmost TVBD devices of both networks by solving r2 from the equation (units in dB): L(r2)=Ptxmax+G(θ)-Im-N • d_locationAB = distance between informed geolocations of networks A and B Päivi Ruuska, Nokia

  7. Neighbor Discovery – interference calculation 3/3 One-sided interferer example: B (red) network is source. A (green) network is victim. Here assumed that master has directed antenna, and client has omnidirectional. r2’ r1’ client client master A master B r1’’ r2’’ • Network A is requesting candidate neighbor list • B is mutual neighbor if • d_locationAB less than r1’+r2’+r1’’ and r1’’+r2’’+r1’ • B is one-sided interferer source if • d_locationAB more than r1’+r2’+r1’’ and less than r1’’+r2’’+r1’ • B is one-sided interferer victim if • d_locationAB less than r1’+r2’+r1’’ and more than r1’’+r2’’+r1’ Päivi Ruuska, Nokia

  8. Example: Initial set-up CDIS CM CE Net1 CE CM CE Net4 Net3 CM CE Net2 Päivi Ruuska, Nokia

  9. New network (Net5) starts operation CDIS CM CE Net1 CE CM CE Net4 Net3 CM CM CE CE Net2 Net5 Päivi Ruuska, Nokia

  10. CM of new network registers to CDIS if the CM is not registered already CDIS CM CE Net1 CM=> CDIS: Register req CDIS: Can I serve the CM? CDIS => CM: Register rsp CE CM CE Net4 Net3 CM CM CE CE Net2 Net5 Päivi Ruuska, Nokia

  11. CM requests neighbor discovery for network 5 from CDIS CDIS CM CM => CDIS: Neighbor discovery req CDIS=> CM: Neighbor discovery rsp Candidate neighbors to Net5: Net2, mutual neighbor Net1, one-directional interferer source CE Net1 CE CM CE Net4 Net3 CM CM CE CE Net2 Net5 Päivi Ruuska, Nokia

  12. Neighbor Inquiry • After receiving candidate neighbor list from the CDIS, the CM initiates neighbor inquiry with the CMs serving candidate neighbors. • CM may not have to start neighbor inquiry related to all candidate neighbors. • Initiating CM sends Neighbor_inquiry_req to CMs serving the candidate neighbors. • This is to access more information of candidate neighbors, and to filter out candidate neighbors which are not able to operate on same channels. • TVBD parameters: TVBD frequency capabilities, RAT type, operating parameters (if operating)… • Target CM responds with Neighbor_inquiry_rsp. • Candidate TVBD parameters: TVBD frequency capabilities, RAT type operating parameters. • Both CMs validate whether the TVBDs are capable of interfering. • If they are capable of operating on same frequencies they may interfere, and capability_to_interfere is set TRUE. Päivi Ruuska, Nokia

  13. CM sends neighbor inquiry request to CMs of candidate neighbors CDIS CM Initiating CM => Target CM: Neighbor inquiry req (TVBD capability parameters, optionally TVBD operating parameters) Target CM => Initiating CM: Neighbor inquiry req (TVBD capability parameters, TVBD operating parameters) Both CMs validate whether TVBDs are capable of interfering. Initiating CM evaluates whether candidate neighbor interferes. The CM may request TVBD to perform measurements on operating channel of candidate neighbor. CE Net1 CE CM CE Net4 Net3 CM CM CE CE Net2 Net5 Initiating CM Päivi Ruuska, Nokia

  14. Neighbor Setting • After receiving the Neighbor_inquiry_rsp and validating capability_to_ interfere=TRUE, the initiating CM evaluates whether candidate neighbor interferes TVBD. • CM may request TVBD to provide measurements to support the evaluation. • Initiating CM shallsend Neigbor_set_req to target CM if it has evaluated own TVBD to be interference victim. It may send Neigbor_set_req to target CM if it has evaluated TVBD to be the interference source only. • The evaluation is based on CDIS interference direction indication, neighbor inquiry based validation of capability_to_interfere, and initiating CM’s own evaluation after neighbor inquiry which may include TVBD measurements. • Parameter: proposed neighbor relationship type (neighbor/one-sided interferer source/one-sided interferer victim) • Target CM responds with Neighbor_set_rsp. • Shall reject if TIME_X elapsed between Neighbor_inquiry_req and Neighbor_set_req, or capability_to_interfere = FALSE.Otherwise: • Shall accept if mutual neighbor relationship is proposed. • May accept if one-sided interferer relationship is proposed. Päivi Ruuska, Nokia

  15. CM sends neighbor set request to CMs of estimated neighbors CDIS CM CE Net1 CE CM CE Net4 Initiating CM => target CM: Neighbor set req -To CM of Net1: one-directional interferer source -To CM of Net2: mutual neighbor Target CM => initiating CM: Neighbor set rsp (accept/reject) Net3 CM CM CE CE Net2 Net5 Initiating CM Päivi Ruuska, Nokia

  16. Neighbor Remove • CMs evaluate the neighbor relationships continuously. If CM discovers that TVBD is not interfering neighbor or vice versa it initiates the neighbor relationship teardown with Neighbor_remove_req • CM shall send request if TVBD is switched off, and may send it because of other reasons. • Optional parameter: reason (TVBD switch off, TVBD mobility, no interference detected, other) • CM of neighbor TVBD shall accept the request by sending Neighbor_remove_rsp. Päivi Ruuska, Nokia

  17. TVBD stops operation - CM sends neighbor removal to CMs of neighbors and updates information to CDIS CDIS CM CM =>CDIS Update TVBD information (remove TVBD) May deregister if no need to serve other TVBDs. CM => neighbor CM Neighbor remove req Neighbor CM => CM Neighbor remove rsp Both CMs remove the neighbors from neighbor lists CE Net1 CE CM CE Net4 Net3 CM CM CE CE Net2 Net5 => stopped operation Päivi Ruuska, Nokia

  18. Summary • In order to provide coexistence services to TVBDs, the coexistence system has to define which TVBDs have to coexist. • This presentation presented the neighbor discovery, neighbor inquiry, set, and remove procedures. Päivi Ruuska, Nokia

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