摘要:
Disclosed is a technique for minimizing the number of prefixes to be allocated to a mobile terminal when the mobile terminal having multiple access technologies moves within a mobility management domain of a local network. According to the technique, management is so performed that prefixes necessary for a mobile terminal (MN 100) to perform communication will be allocated to the MN, and a mobility management domain 110 maintains only the prefixes necessary for the MN to perform communication. For example, when the MN detects a state in which a prefix needs changing (step S120), it determines a state in which network prefixes necessary for the MN are allocated to the MN, and notifies the mobility management domain of prefix preference for achieving this state (step s150). The prefix preference includes a reduce request for unnecessary prefixes, a reuse request on another interface, a recycle request indicative of use at another MN, and the like.
摘要:
A technique is disclosed, by which a mobile terminal (mobile node) performing handover can quickly and continuously receive after the handover the additional services as it has been receiving before the handover. According to this technique, MN (mobile node; mobile terminal) 10 transmits a message including a session identifier or the like of a path 24 to QNE (proxy) 68 under the condition connected to AR (access router) 21 before the handover. QNE 62 and QNE 63 on a path 34 where this message is transferred are present on the path 24, and its own interface address is added to the message. On the other hand, QNE 67 is not present on the path 24 and transfers the message as it is. As a result, QNE (proxy) 68 determines QNE 63 as a crossover node and turns the path upstream from QNE 63 to an identical path, while a path 35 as changed from a downstream path can be set as a path to be used by MN after the handover.
摘要:
According to the present invention, connection can be always maintained between the mobile node and the access router, and disruption of on-going transport session can be prevented by making effective use of two architectures (hierarchical and mesh architectures). The mobile nodes 1000-1, 1000-2 and 1000-3 are attached to the access router 1100-1. When the mobile node maintains link layer connectivity with the access router, it is in the hierarchical mode, whereas when the link layer connectivity is lost, it enters the mesh mode. In the mesh mode, the mobile node attempts to establish virtual link layer connectivity with the access router through other nodes by using mesh network protocol such as MANET. In the mesh mode, the packet is capsulated between the mobile node and the access router when the mobile node and the peer 1400-1 communicate with each other.
摘要:
Disclosed is a technique to enable a mobile terminal to grasp an address handling method used for each service and hence to achieve more efficient communication. According to this technique, a mobile terminal (UE) 15 inquires a home PMIPv6 domain 10 about a method of handling each address currently maintained by the mobile terminal (e.g., which address should be used as an MIPv6 home address (HoA)) in a state of being attached to the home PMIPv6 domain 10 before starting MIPv6 as a mobile management protocol, and acquires and stores the inquiry result in advance. Then, for example, when moving to a foreign network 20 and starting MIPv6, the stored inquiry result is referred to select an address appropriate as an HoA in order to perform a search for a HA (Home Agent) and BU (Binding Update) transmission.
摘要:
There is disclosed a technique which can detect a packet routing loop (in particular, a nesting loop formed by MRs (mobile routers). According to this technique, an MR 114 connected as a subordinate to an MR 110 transmits a BU (Binding Update) message, to which added is an ARO (Access Router Option) including an address of a router (MR 110) connected at present, to an HA (Home Agent) 140 to which it pertains. Moreover, an MR 112 is connected as a subordinate to the MR 114 and, when connected to the MR 112, the MR 110 transmits a BU message, to which added is an ARO including an address of the MR 112, to the HA 140. At this time, the MR 112 also transmits a BU message, to which added is an ARO including an address of the MR 114, to the HA 140. Thus, the HA 140 can detect a routing loop formed by connections 120, 122 and 124.
摘要:
The present invention discloses a radio communication method or the like, which contributes to the improvement of data transmission efficiency in a radio communication based on TDMA system (in particular, radio communication in accordance with IEEE Std. 802.11) by providing idle time between the data transmitted and received by radio communication terminals on a radio section. In the radio communication between radio communication terminals, data transmission efficiency is improved by reducing transmission time of header added to the data or by reducing idle time. More concretely, header is added to the data for each predetermined data transmission, for instance, and by transmitting the other data without header added to it, transmission time of header is reduced. Also, data transmission efficiency is improved by carrying out methods such as a method to acquire header of the data on radio section in advance, a method to utilize identification information as the header, and a method to transmit continuous data by reducing IFS (InterFrame Space) after Ack (receiving acknowledgment information).
摘要:
In this present invention, when the HA is performing Bulk Registration for a Multimode Node, the HA will tagged those CoAs specified within the single BU as unverified. A verification mechanism implemented at the HA will be triggered to test the addressability of the unverified CoA before using the said unverified CoA. The method of verification involves the HA to send an acknowledgment message to an unverified CoA of the Multimode Node to test the said unverified CoA for its addressability. When the Multimode Node receives the acknowledgment message from the HA, the Multimode Node replies the HA with another single BU. Upon the receipt of the second single BU from the Multimode Node, the HA can then verify that the said unverified CoA of the Multimode Node.
摘要:
A technique is disclosed, according to which a race condition between a PMIPv6 binding by a PBU message of PMIPv6 and a CMIPv6 binding by a BU message of CMIPv6 can be resolved. MN 200 has a plurality of radio communication interfaces, and a first interface is connected to MAG 220 of a home PMIPv6 domain 230, for instance. In case the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to AR 222 of a CMIPv6 domain 231, a BU message 262 is transmitted from the second interface to LMA/HA 250, and identification information of this BU message is notified to MAG from the first interface. By adding time information to this identification information and by transmitting it to LMA/HA, MAG can identify transmission time of the BU message (i.e. relative order with the other messages) from this time information.
摘要:
A radio communication base station apparatus, a radio communication terminal, and radio transmission and reception methods for a terminal to efficiently acquire the service status of the neighbor-cell before the terminal makes a cell change are provided. A subarea ID storage section 107 stores a subarea identifier. An MIB generator 102 generates a master information block including scheduling information of a scheduling block and the subarea identifier of the subarea to which the own cell belongs, and transmits the master information block from an MIB transmitter 108. An MBMS SB generator 104 generates the scheduling block including the identifier of the subarea where the broadcast or multicast service is provided, and transmits the scheduling block from an MBMS SB transmitter 109.
摘要:
A technique is disclosed whereby, while a MN (mobile node) is separated from a home network, the status available on a home network is obtained, and a communication path is optimized for a packet to be transmitted between the MN and a CN (correspondent node) via a HA (home agent). According to this technique, an HA 20 that manages a plurality of home addresses allocated to an MN 10 detects communication statuses of, for example, an ISP1 and an ISP2, and selects a home address that is designated, for a packet transfer to be performed from the MN, via the HA, to a CN 15, as a source address for the inner packet of an encapsulated packet to be transmitted from the MN to the HA. Since the MN designates this home address as the source address for the inner packet, a packet decapsulated and transferred by the HA is delivered to the CN via the ISP1 or the ISP2 in a superior communication status.