Method for relocating gateway, mobile management entity and host base station

A mobility management entity, comprising:

• a receiver and a relocation judgment circuit, wherein:
• the receiver is configured to:
• in a process of a mobile relay node, MRN, performing handover of a donor evolved Node B, DeNB, receive relocation judgment indication information;
• and
• the relocation judgment circuit is configured to:
• judge whether it is required to execute a relocation of a gateway serving the MRN according to the relocation judgment indication information;
• wherein, the relocation judgment indication information is sent to the receiver after a source DeNB or a target DeNB of the MRN judges whether it is required to execute the relocation of the gateway serving the MRN according to relocation judgment auxiliary information;
• or the relocation judgment indication information is sent to the receiver after a target DeNB of the MRN judges whether it is required to execute the relocation of the gateway serving the MRN according to configuration information;
• wherein:
• the relocation judgment auxiliary information comprises:
• counting information used for counting times of handover occurrence in the MRN after the last gateway relocation occurs;
• or,
• indication information in a history accessing cell list of the MRN and used for marking a source cell or a target cell when multiple times of history gateway relocation occurs in the MRN, or,
• identification information of a source cell or a target cell when multiple times of history gateway relocation occurs in the MRN;
• or,
• history accessing cell record information of the MRN after the last gateway relocation occurs;
• wherein, the source DeNB or the target DeNB of the MRN judging whether it is required to execute the relocation of the gateway serving the MRN according to the relocation judgment auxiliary information comprises:
• the source DeNB or the target DeNB, according to the relocation judgment auxiliary information, determining the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN;
• and
• the source DeNB or the target DeNB judging whether the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN reaches an accessing cell number threshold value, and if the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN reaches the accessing cell number threshold value, judging that it is required to execute the relocation of the gateway serving the MRN.

A donor evolved Node B, comprising:

• a judgment circuit and a transmitter, wherein:
• the judgment circuit is configured to:
• in a process of a mobile relay node, MRN, performing handover of a donor evolved Node B, DeNB, judge whether it is required to execute a relocation of a gateway serving the MRN according to relocation judgment auxiliary information;
• or, judge whether it is required to execute a relocation of a gateway serving the MRN according to configuration information;
• and
• the transmitter is configured to:
• send relocation judgment indication information to a mobility management entity, MME, of the MRN;
• wherein:
• the relocation judgment auxiliary information comprises:
• counting information used for counting times of handover occurrence in the MRN after the last gateway relocation occurs;
• or,
• indication information in a history accessing cell list of the MRN and used for marking a source cell or a target cell when multiple times of history gateway relocation occurs in the MRN;
• or,
• identification information of a source cell or a target cell when multiple times of history gateway relocation occurs in the MRN;
• or,
• history accessing cell record information of the MRN after the last gateway relocation occurs;
• wherein:
• the judgment circuit is configured to judge whether it is required to execute the relocation of the gateway serving the MRN according to the relocation judgment auxiliary information in the following way:
• determining, according to the relocation judgment auxiliary information, the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN;
• and judging whether the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN reaches an accessing cell number threshold value, and if the number of cells which the MRN accesses after the last relocation of the gateway serving the MRN reaches the accessing cell number threshold value, judging that it is required to execute the relocation of the gateway serving the MRN.