# US 2014/0153454 A1 · Method for resource management in a cellular communication network and resource management system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153454 A1 - Document ID: US20140153454A1 - Status: Published application - Kind: A1 - Application number: 14/235,195 - Filed: 2012-07-24 - Published: 2014-06-05 - Earliest claimed: 2011-07-26 - Assignees: NEC Europe Ltd. - Inventors: Konstantinos Samdanis; Peter Rost; Long Le - Web page: https://patentgrep.com/patent/US20140153454A1 ## CPC - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/1469: {using time-sharing} - H04W 52/14: Separate analysis of uplink or downlink - H04W 52/243: {taking into account interferences} - H04W 16/12: Fixed resource partitioning - H04W 52/143: {Downlink power control} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for resource management in a cellular communication network, wherein the network includes at least one base station per cell for a plurality of cells that operates in TDD (Time Division Duplex) transmission mode, wherein the base stations implement a respective UL/DL configuration mode in which frames are composed of a specific sequence of downlink DL, uplink UL and special S subframes, is characterized in that the base stations are operated such that neighboring base stations with adjacent and/or overlapping coverage areas employ different UL/DL configuration modes, wherein interference between neighboring base stations is taken account of by implementing power control on a subframe basis. Furthermore, a resource management system for use in a cellular communication network is described. ## Claims ### Claim 1 Method for resource management in a cellular communication network, wherein said network includes at least one base station per cell for a plurality of cells that operates in TDD (Time Division Duplex) transmission mode, wherein said base stations implement a respective UL/DL configuration mode in which frames are composed of a specific sequence of downlink DL, uplink UL and special S subframes, which comprises operating said base stations such that neighboring base stations with adjacent and/or overlapping coverage areas employ different UL/DL configuration modes, and taking into account interference between neighboring base stations by implementing power control on a subframe basis. ### Claim 2 (depends on 1) Method according to claim 1, wherein a base station identifies those subframes—potentially interfering subframes—which are potentially subject to interference. ### Claim 3 (depends on 1) Method according to claim 1, wherein a base station identifies those subframes as potentially interfering subframes for which at least two other base stations with adjacent and/or overlapping coverage areas employ a different UL/DL configuration mode. ### Claim 4 (depends on 1) Method according to claim 1, wherein a base station performs power control for potentially interfering subframes, in particular by reducing its transmission power for said potentially interfering subframes. ### Claim 5 (depends on 1) Method according to claim 1, wherein a base station, in case a potentially interfering subframe is an S subframe, keeps using the DL part of said S subframe, provided a neighboring base stations with adjacent and/or overlapping coverage area also employs a DL subframe. ### Claim 6 (depends on 1) Method according to claim 1, wherein said power control is implemented by introducing subframes with a fixed maximum power. ### Claim 7 (depends on 1) Method according to claim 1, wherein said power control is implemented by introducing time-zones with different maximum power, wherein UEs are scheduled to these time-zones depending on their long-term Signal-to-Noise SNR. ### Claim 8 (depends on 7) Method according to claim 7, wherein said maximum power is specified on the basis of the results of a training phase. ### Claim 9 (depends on 1) Method according to claim 1, wherein said power control includes performing per-frame signaling among potentially interfering base stations and adjusting power sequentially. ### Claim 10 (depends on 1) Method according to claim 1, wherein said power control includes controlling the maximum power depending on the backhaul capacity and/or the number of UEs being served by the involved base stations. ### Claim 11 (depends on 1) Method according to claim 1, wherein said power control includes excluding parts of the spectrum in the DL. ### Claim 12 (depends on 1) Method according to claim 1, wherein UL/DL configuration mode selection is performed cooperatively among base stations based on information provided by a central entity and/or by the base stations themselves. ### Claim 13 (depends on 1) Method according to claim 1, wherein a respective resource demand is determined for said base stations on the basis of an estimation and/or forecasting of the traffic volume associated with said base stations. ### Claim 14 (depends on 1) Method according to claim 1, wherein a monitoring is performed that keeps track of evolving resource demands. ### Claim 15 (depends on 1) Method according to claim 1, wherein oscillations among different UL/DL configuration mode are avoided by way of introducing a hold down timer for each UL/DL configuration mode. ### Claim 16 (depends on 1) Method according to claim 1, wherein UL/DL configuration mode selection is performed by iterative adjustments. ### Claim 17 (depends on 16) Method according to claim 16, wherein said iterative adjustments are made depending on QoS demands and the fulfillment of said QoS demands. ### Claim 18 (depends on 1) Method according to claim 1, wherein base stations adjust their UL/DL configuration mode based on the UL/DL configuration mode selected by neighboring base stations with adjacent and/or overlapping coverage areas. ### Claim 19 (depends on 1) Method according to claim 1, wherein selected UL/DL configuration modes are communicated among base stations and/or towards an associated OAM. ### Claim 20 (depends on 1) Method according to claim 1, wherein base stations with identical or similar UL/DL resource demands and/or geographical properties are grouped to form a cluster, wherein UL/DL configuration mode selection is performed on the level of said clusters. ### Claim 21 (depends on 1) Method according to claim 1, wherein UL/DL configuration mode selection is performed by means of interference management. ### Claim 22 (depends on 1) Method according to claim 1, wherein UL/DL configuration modes with an increased ratio of UL-subframes are selected during off-peak times. ### Claim 23 Resource management system for use in a cellular communication network, wherein said network includes at least one base station per cell for a plurality of cells that operates in TDD (Time Division Duplex) transmission mode, wherein said base stations are configured to implement a respective UL/DL configuration mode in which frames are composed of a specific sequence of downlink DL, uplink UL and special S subframes, wherein the system comprises a management mechanism that controls the operation of base stations in such a way that neighboring base stations with adjacent and/or overlapping coverage areas employ different UL/DL configuration modes, wherein interference between neighboring base stations is taken into account by implementing power control on a subframe basis.