Route selecting device and mobile radio communication system

Patent metadata

Field	Value
Publication number	US-9215643-B2
Application number	US-200913388633-A
Country	US
Kind code	B2
Filing date	Sep 4, 2009
Priority date	Sep 4, 2009
Publication date	Dec 15, 2015
Grant date	Dec 15, 2015

Abstract

A mobile radio communication system having one or more relay stations and base stations, a gateway, an external device having a route selection function, and a policy control device which selects a main route and a sub route on the basis of residual resources in a radio communication device. The mobile station connected to one radio communication device can select another radio communication device having a large amount of residual resources as a new access point when the one radio communication device cannot be used, to prevent shortage of the radio resources. Also, it is possible to enable a process of selecting the radio communication device as a new access point to be omitted when switching one route to another by determining a sub route as the new access point when a main route is disconnected in advance, to shorten a service disconnection time.

First claim

The invention claimed is:

1. A route selecting device, comprising:
a first memory that stores profile information including, with respect to an identifier “main BSID” of a base station BS, an identifier “MSID” of a mobile station MS that has already selected the BS having the main BSID as a main route, an identifier “sub BSID” of the BS selected as a sub route by the MS having the MSID, an index r MS of a radio resource amount requested by the MS having the MSID, a total Σr MSmain of the indexes of the radio resource amount requested by the MS with respect to the MS that has already selected the BS having the main BSID as the main route, an index r BSmax of an upper limit of the radio resource amount acceptable by the BS having the main BSID, and an evaluation index R rmain based on a residual radio resource amount of the BS having the main BSID as the main route;
a second memory that stores the profile information on the BS selectable as the main route in association with an index r MSnew of the radio resource amount requested by the MS that requests route setting; and
a processor that calculates an evaluation index of the route, and selects the route on the basis of the evaluation index,

wherein
the processor receives, from the BS, a first message including the MSID of the mobile station, the index r MSnew of the radio resource amount requested by the MS, and an identifier “available BSIDs” of the BSIDs of the BS communicatable with the subject mobile station, within requests for the route setting which are transmitted from the MS,
the processor extracts, from the first memory, the profile information of the BSs corresponding to a plurality of BSIDs selectable as the route, which are included in the available BSIDs within the first message, and creates the second memory on the basis of the profile information on the BS and r MSnew , and
the processor calculates an index (R rmain ) n of a first residual resource amount on the basis of a ratio of (r BSmax ) n to a sum of (Σr MSmain ) n and r MSnew for a route n according to the information stored in the second memory when selecting the main route, to calculate an evaluation index (R main ) n of the main route based on the first residual resource amount of the BS with respect to the BSs having the main BSIDs stored in the second memory where n is an index of a route, and
the processor selects the BS that is the largest in the calculated evaluation index (R main ) n of the main route as the main route.

2. The route selecting device according to claim 1 , comprising:
a quality information memory that stores quality information on the MSID and the BSID of the communicatable BS having the MSID, and a parameter of weight for the MSID and an identifier APLID of an application which is executed by the route,

wherein
the first message further includes the APLID included in the setting request of the route which is transmitted from the MS, and the processor obtains the quality information and the parameter of weight from the quality information memory with respect to the BSID of the available BSID within the second memory on the basis of the MSID and the APLID,
the processor multiplies the quality information by the parameter of the weight to calculate the evaluation index (R QoS ) n of the route based on the quality of each route n with respect to the BSs having the main BSIDs in the second memory,
the processor calculates the evaluation index (R main ) n of the main route based on the residual resource amount of the BS and the quality of the route, according to a weighted addition value of the evaluation index (R QoS ) n of the route based on the quality of each route n and the evaluation index (R rmain ) n of the first residual resource amount, for each route n, with respect to the BSs having the main BSIDs within the second memory, and
the processor selects the BS that is the largest in the calculated evaluation index (R main ) n of the main route as the main route.

3. The route selecting device according to claim 1 , wherein the evaluation index (R main ) n of the main route is obtained by the following expression:
( R main ) n =( P main ) n ( W QoS ( R QoS ) n + W rmain ( R rmain ) n )
where
n is an index of the route,
(P main ) n is policy information (weight related to the use of the BS) indicative of priority by which the BS is selected as the main route,
(R rmain ) n is an evaluation of the main route based on the residual resource of the BS,
W QoS is a parameter of the weight for (R QoS ) n , and
W rmain is a parameter of the weight for (R rmain ) n .

4. The route selecting device according to claim 1 , further comprising:
a policy control device having a policy memory that stores quality information on the MSID and the BSID of the communicatable BS having the MSID, and a parameter of weight for the MSID and an APLID which is an identifier of an application which is executed by the route, wherein
if the route selecting device does not set the quality information in the quality information memory, the processor transmits, to the policy control device, a message including the MSID, the available BSID, and the APLID included in the setting request of the route which is transmitted from the MS, and requests the quality information on the BS and the weight parameter, and
when receiving the quality information from the policy control device, the processor stores the quality information and the weight parameter in the quality information memory.

5. The route selecting device according to claim 1 , further comprising:
a third memory that stores an identifier “sub BSID” of the BS selectable BS as the sub route, a total Σr MSmain of the indexes of the radio resource amount requested by the MS with respect to the MS that has already selected the BS having the main BSID as the main route, a total Σr MSsub of the indexes of the radio resource amount requested by the MS with respect to the MS that has already selected the BS having the main BSID as the main route and has already selected the BS having the sub BSID as the sub route, an index r BSmax of an upper limit of the radio resource amount acceptable by the BS having the sub BSID, an evaluation index R rsub based on the residual radio resource amount of the BS having the sub BSID as the sub route, and an index r MSnew of the radio resource amount requested by the MS that requests the route setting, in association with the main BSID selected as the main route,
the processor extracts information on the BS selected as the main route from the first memory or the second memory, and creates the third memory on the basis of the extracted information on the BS and r MSnew within the first message,
the processor calculates an index (R rsub ) n of a second residual resource amount according to a ratio of (r BSmax ) n to a sum of (Σr MSmain ) n , (Σr MSsub ) n , and r MSnew for the route n on the basis of the information stored in the third memory, when selecting the sub route, to calculate an evaluation index (R sub ) n of the sub route based on the second residual resource amount of the BS with respect to the BSs having the sub BSIDs in the third memory, and
the processor selects the BS that is the largest in the calculated evaluation index (R sub ) n of the sub route as the sub route.

6. The route selecting device according to claim 5 , wherein
the processor calculates the overall evaluation index (R sub ) n of the sub route based on the residual resource amount of the BS and the quality of the route, according to a weighted addition value of the evaluation index (R QoS ) n of the route based on the quality of each route and the index (R rsub ) n of the second residual resource amount, with respect to the BSs having the ma

Assignees

• Muto Yuta
• Watanabe Koji
• Hitachi Ltd

Inventors

• Muto Yuta
• Watanabe Koji

Classifications

• H04L45/22

  Alternate routing · CPC title

• H04W72/00

  Local resource management · CPC title

• H04W28/10

  Flow control {between communication endpoints} · CPC title

• H04L45/24

  Multipath · CPC title

• H04W8/22

  Processing or transfer of terminal data, e.g. status or physical capabilities · CPC title