# US 2014/0153474 A1 · Method, base station and system for reselection or handover to broadcast multicast cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153474 A1 - Document ID: US20140153474A1 - Status: Published application - Kind: A1 - Application number: 14/175,098 - Filed: 2014-02-07 - Published: 2014-06-05 - Earliest claimed: 2011-08-12 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Junhui Zhao; Qinghai Zeng; Mingzeng Dai - Web page: https://patentgrep.com/patent/US20140153474A1 ## CPC - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 36/0007: {for multicast or broadcast services, e.g. MBMS (multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40)} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 36/0061: {of neighbour cell information} - H04W 36/008357: {Determination of target cell based on access point [AP] properties, e.g. AP service capabilities} - H04W 48/12: using downlink control channel - H04W 48/20: Selecting an access point - H04W 76/40: for selective distribution or broadcast - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention discloses a method and system for reselecting or handing over to a broadcast multicast cell. The method includes the following steps: broadcasting, by an MBMS cell, a service area identity list of a service area to which the MBMS cell belongs; determining, by a UE, whether the service area identity list includes a service area identity corresponding to a service; if the service area identity list includes service area identity corresponding to the service, setting, by the UE, a cell reselection priority of a frequency of an MBMS cell to the highest. According to the present invention, a UE can identify whether a cell capable of providing services that the UE is receiving or is interested in around the UE, so that the cell can learn which neighboring cells are MBMS cells and what services are being broadcast in MBMS cells if such MBMS cells are available. ## Claims ### Claim 1 A method for setting a frequency priority, comprising: receiving, by a user equipment (UE), a service area identity list of a service area of a multimedia broadcast multicast service (MBMS) cell broadcast by a base station to which the MBMS cell belongs; determining, by the UE, whether the service area identity list comprises a service area identity corresponding to an MBMS service that the UE is receiving or is interested in; and if the service area identity list comprises the service area identity corresponding to the MBMS service that the UE is receiving or is interested in, setting, by the UE, a cell reselection priority of a frequency of the MBMS cell to the highest. ### Claim 2 (depends on 1) The method according to claim 1, wherein the step of setting, by the UE, the cell reselection priority of the frequency of the MBMS cell to the highest is performed when a signal of the MBMS cell is better than a threshold or when the MBMS service is started. ### Claim 3 (depends on 2) The method according to claim 2, wherein when the MBMS cell is a neighboring cell of a serving cell of the UE, the method further comprising: receiving, by the UE, an indication indicating that configuration information of a multicast control channel (MCCH) change notification of the MBMS cell is changed wherein the indication is sent by the base station to which the MBMS cell belongs through an interface between the base station to which the MBMS cell belongs and a base station to which the serving cell of the UE belongs; and reading, by the UE, the configuration information of the MCCH change notification of the MBMS cell according to the indication indicating that the configuration information of the MCCH change notification of the MBMS cell is changed; monitoring, by the UE, the MCCH change notification in a physical downlink control channel (PDCCH) of the MBMS cell according to the configuration information of the MCCH change notification of the MBMS cell; and when the MCCH change notification of the MBMS cell is detected, reading, by the UE, the MCCH of the MBMS cell to determine whether the MBMS service starts to be broadcast. ### Claim 4 (depends on 3) The method according to claim 3, wherein the interface between the base station to which the MBMS cell belongs and the base station to which the serving cell of the UE belongs is an X2 interface. ### Claim 5 (depends on 2) The method according to claim 2, wherein when the MBMS cell is a neighboring cell of a serving cell of the UE, the method further comprises comprising: obtaining, by the UE, configuration information of a multicast control channel (MCCH) change notification of the MBMS cell broadcast by a base station to which the serving cell belongs; monitoring, by the UE, the MCCH change notification of the MBMS cell broadcast in a physical downlink control channel (PDCCH) of the serving cell according to the configuration information of the MCCH change notification of the MBMS cell to determine whether the MCCH of the MBMS cell is changed; and when determining that the MCCH of the MBMS cell is changed, reading, by the UE, the MCCH of the MBMS cell according to the detected MCCH change notification of the MBMS cell to determine whether the MBMS service starts to be broadcast. ### Claim 6 A user equipment (UE), comprising: a receiver, configured to receive a service area identity list of a service area of a multimedia broadcast multicast service (MBMS) cell broadcast by a base station to which the MBMS cell belongs; a processor, configured to determine whether the service area identity list comprises a service area identity of an MBMS service that the UE is receiving or is interested in; and if the service area identity list comprises a service area identity corresponding to the MBMS service that the UE is receiving or is interested in, to set a cell reselection priority of a frequency of the MBMS cell to the highest. ### Claim 7 (depends on 6) The UE according to claim 6, wherein the processor is configured to set the cell reselection priority of the frequency of the MBMS cell to the highest, comprising: when a signal of the MBMS cell is better than a threshold or when the MBMS service is started, the processor is configured to set the cell reselection priority of the frequency of the MBMS cell to the highest. ### Claim 8 (depends on 7) The UE according to claim 7, wherein when the MBMS cell is a neighboring cell of a serving cell of the UE, the receiver is further configured to receive an indication indicating that configuration information of an MCCH change notification of the MBMS cell is changed, wherein the indication is sent by the base station to which the MBMS cell belongs through an interface between the base station to which the MBMS cell belongs and a base station to which the serving cell of the UE belongs; and the processor is further configured to read the configuration information of the MCCH change notification of the MBMS cell according to the indication indicating that the configuration information of the MCCH change notification of the MBMS cell is changed; and further configured to monitor an MCCH change notification in a physical downlink control channel (PDCCH) of the MBMS cell according to the configuration information of the MCCH change notification of the MBMS cell; and further configured to read the MCCH of the MBMS cell when the MCCH change notification of the MBMS cell is detected, so as to determine whether the MBMS service starts to be broadcast. ### Claim 9 (depends on 7) The UE according to claim 7, wherein when the MBMS cell is a neighboring cell of a serving cell of the UE, the receiver is further configured to receive configuration information of an MCCH change notification of the MBMS cell broadcast by a base station to which the serving cell of the UE belongs; and the processor is further configured to monitor the MCCH change notification of the MBMS cell broadcast in a physical downlink control channel (PDCCH) of the serving cell according to the configuration information of the MCCH change notification of the MBMS cell, so as to determine whether the MCCH of the MBMS cell is changed; and the processor is further configured to: when determining that the MCCH of the MBMS cell is changed, read the MCCH of the MBMS cell according to the detected MCCH change notification of the MBMS cell, so as to determine whether the MBMS service starts to be broadcast. ### Claim 10 A base station, comprising: a transmitter and a memory; wherein the transmitter is configured to broadcast a service area identity list of a service area of a multimedia broadcast multicast service (MBMS) cell of the base station, wherein the service area identity list is used for a UE to set a cell reselection priority of a frequency of the MBMS cell to the highest, when the UE determines that the service area identity list comprises a service area identity corresponding to an MBMS service that the UE is receiving or is interested in after the UE receives the service area identity. ### Claim 11 (depends on 10) The base station according to claim 10, wherein when the MBMS cell is a neighboring cell of a serving cell of the UE, the transmitter is further configured to send an indication indicating that configuration information of a multicast control channel (MCCH) change notification of the MBMS cell is changed to a base station to which the serving cell of the UE belongs through an interface between the base station and the base station to which the serving cell of the UE belongs; so that the UE obtains, through the base station to which the serving cell of the UE belongs, the indication indicating that the configuration information of the MCCH change notification of the MBMS cell is changed, reads the configuration information of the MCCH change notification of the MBMS cell according to the indication indicating that the configuration information of the MCCH change notification of the MBMS cell is changed, and monitors the MCCH change notification in a physical downlink control channel (PDCCH) of the MBMS cell according to the configuration information of the MCCH change notification of the MBMS cell; wherein when the MCCH change notification of the MBMS cell is detected, the UE reads the MCCH of the MBMS cell, to determine whether the MBMS service starts to be broadcast; and when determining that the MBMS service that the UE is receiving or is interested in starts to be broadcast, the UE sets the priority of the frequency of the MBMS cell to the highest for the reselection of the base station to which the cell belongs. ### Claim 12 (depends on 10) The base station according to claim 10, wherein when the MBMS cell is a neighboring cell of the serving cell of the UE, the transmitter is further configured to: send configuration information of a multicast control channel (MCCH) change notification of the MBMS cell and the MCCH change notification of the MBMS cell to a base station to which the serving cell of the UE belongs through an interface between the base station to which the MBMS cell belongs and the base station to which the serving cell of the UE belongs; so that the UE obtains, through the base station to which the serving cell of the UE belongs, the configuration information of the MCCH change notification of the MBMS cell; monitors the MCCH change notification of the MBMS cell broadcast in a physical downlink control channel (PDCCH) of the serving cell of the UE according to the configuration information of the MCCH change notification of the MBMS cell, to determine whether the MCCH of the MBMS cell is changed; wherein when determining that the MCCH of the MBMS cell is changed, the UE reads the MCCH of the MBMS cell according to the detected MCCH change notification of the MBMS cell, to determine whether the MBMS service starts to be broadcast; and when determining that the MBMS service that the UE is receiving or is interested in starts to be broadcast, the UE sets a cell reselection priority of a frequency of the MBMS cell to the highest. ### Claim 13 (depends on 12) The base station according to claim 12, wherein the interface between the base station to which the MBMS cell belongs and the base station to which the serving cell of the UE belongs is an X2 interface.