Einzeltreffer — DigiBib

Systems and techniques for avoiding inefficiencies resulting from failed handover attempts. A base station selects one or more mobility management entity (MME) pools for assignment to a relay node, with the selection being performed so as to minimize or eliminate handover attempts requiring that a target device support a particular MME pool when the MME pool is not supported by the MME. A base station selects, when communicating with a relay node, a subset of the MME pools that it supports and assigns the subset to the base station. UEs served by the relay node are assigned the MME pool or MME pools assigned to the relay node. The relay node is informed of the MME pools supported by one or more neighbor nodes and, when attempting a handover to a neighbor node, attempts an X2 handover only to neighbor nodes supporting an MME pool assigned to the relay node.

Titel:	Relay enhanced cellular telecommunication network
Autor/in / Beteiligte Person:	Teyeb, Oumer ; Raaf, Bernhard ; Zhou, Weihua
Link:	Zum Volltext
Veröffentlichung:	2012
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20120039299 Publication Date: February 16, 2012 Appl. No: 13/136782 Application Filed: August 10, 2011 Claim: 1. A method comprising: configuring an apparatus to perform operations comprising: sending a globally unique group identifier list to a device; wherein sending the globally unique group identifier list to the device is performed upon one or more of initial association with the device or a configuration update for the device; and wherein sending of the globally unique group identifier list comprises, if the device is a relay node associated with the apparatus, including in the globally unique group identifier list a subset of MME pool identifiers associated with the apparatus, wherein the MME pool identifiers included in the subset are chosen so as to exclude MME pool identifiers that are unsupported by one or more neighbor nodes of the device. Claim: 2. The method of claim 1, wherein sending a globally unique group identifier list to a relay node further comprises assigning the one or more MME pools to all UEs served by the relay node. Claim: 3. The method of claim 1, wherein the globally unique group identifier list for a relay node is sent to the relay node upon initial attachment by the relay node to the apparatus. Claim: 4. The method of any of claim 1, wherein the subset of MME pools selected for a relay node comprises a single MME pool. Claim: 5. The method of claim 1, wherein the subset of MME pools selected for a relay node comprises all MME pools meeting the condition that the MME pool is supported by all neighboring cells of the relay node. Claim: 6. The method of claim 1, wherein the operations further comprise, upon establishing a connection with a neighbor node, sending a configuration update to the relay node comprising a globally unique group identifier list identifying one or more MME pools supported by the neighbor node. Claim: 7. The method of claim 6, wherein the operations further comprise responding to a change in the one or more MME pools supported by a neighbor node to send a configuration update to the relay node to report the change. Claim: 8. The method of claim 1, wherein the operations further comprise causing the apparatus to assign one or more MME pools to the relay node based on information indicating which MME pools are supported by neighbors of the relay node. Claim: 9. The method of claim 7, wherein the operations further comprise: assigning a new MME pool to UEs being served by the relay node; and performing an MME relocation procedure for UEs not currently assigned to the new MME pool. Claim: 10. The method of claim 1, wherein the operations further comprise: receiving from the relay node information specifying one or more MME pools supported by neighbors of the relay node; and assigning one or more MME pools to the relay node based on the information received from the relay node. Claim: 11. The method of claim 1, wherein the operations further comprise: configuring a relay node operating in an LTE wireless network to perform operations comprising: identifying an MME pool serving a UE associated with the relay node receiving information identifying one or more MME pools supported by a handover target; comparing the one or more MME pools supported by the handover target to the MME pool serving the UE; if the handover target supports the MME pool serving the UE, initiating an X2 handover to handover the UE to the target; and if the handover target does not support the MME pool serving the UE, initiating an S1 handover to handover the UE to the target. Claim: 12. A non-transitory computer-readable medium storing a program of instructions, execution of which by at least one data processor of a donor eNB causes operations comprising: selecting a single MME pool for all UEs connected to a specified relay node associated with the donor eNB; and communicating the identity of the selected MME pool to the specified relay node. Claim: 13. The computer-readable medium of claim 12, wherein communicating the identity of the selected MME pool to the specified relay node is performed using one or more of X2 setup and update procedures. Claim: 14. A method comprising: configuring a relay node operating in an LTE wireless network to perform operations comprising: identifying an MME pool serving a UE associated with the relay node; receiving information identifying one or more MME pools supported by a handover target; comparing the one or more MME pools supported by the handover target to the MME pool serving the UE; if the handover target supports the MME pool serving the UE, initiating an X2 handover to handover the UE to the target; and if the handover target does not support the MME pool serving the UE, initiating an S1 handover to handover the UE to the target. Claim: 15. The method of claim 14, wherein the information identifying the one or more MME pools supported by the handover target is received from a donor eNB in a configuration update. Claim: 16. The method of claim 14, wherein the information identifying the one or more MME pools supported by the handover target is sent by the donor eNB in response to a change in the one or more MME pools supported by a neighbor node. Claim: 17. The method of claim 14, wherein the operations further comprise sending information to the donor eNB specifying MME pools supported by neighbors of the relay node, and wherein the information is sent to the donor eNB during either an X2 or an X2 setup response procedure. Claim: 18. The method of claim 14, wherein the operations further comprise receiving from the donor eNB information identifying all MME pools meeting the condition that the MME pool is supported by all neighbors of the relay node. Claim: 19. A non-transitory computer readable medium storing a program of instructions, execution of which by at least one data processor of a relay node operating in an LTE wireless network causes operations comprising: identifying an MME pool serving a UE associated with the relay node; receiving information identifying one or more MME pools supported by a handover target; comparing the one or more MME pools supported by the handover target to the MME pool serving the UE; if the handover target supports the MME pool serving the UE, initiating an X2 handover to handover the UE to the target; and if the handover target does not support the MME pool serving the UE, initiating an S1 handover to handover the UE to the target. Claim: 20. An apparatus comprising: a least one processor; memory storing computer program code; wherein the memory and the computer program code are configured, with the at least one processor, to cause operations comprising: sending a globally unique group identifier list to a device; wherein sending the globally unique group identifier list to the device is performed upon one or more of initial association with the device or a configuration update for the device; and wherein sending of the globally unique group identifier list comprises, if the device is a relay node associated with the apparatus, including in the globally unique group identifier list a subset of MME pool identifiers associated with the apparatus, wherein the MME pool identifiers included in the subset are chosen so as to exclude MME pool identifiers that are unsupported by one or more neighbor nodes of the device. Claim: 21. An apparatus comprising: at least one processor; a memory storing computer program code; wherein the memory and the computer program code are configured, with the processor, to cause operations comprising: identifying an MME pool serving a UE associated with the relay node receiving information identifying one or more MME pools supported by a handover target; comparing the one or more MME pools supported by the handover target to the MME pool serving the UE; if the handover target supports the MME pool serving the UE, initiating an X2 handover to handover the UE to the target; and if the handover target does not support the MME pool serving the UE, initiating an S1 handover to handover the UE to the target. Current U.S. Class: 370/331 Current International Class: 04

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Relay enhanced cellular telecommunication network