Channel assignment method in mobile communication system in which channel which meets predetermined criteria is channel selected
First Claim
1. A channel assignment method for a mobile communication system, comprising the steps of:
- selecting one of all idle speech communication channels in accordance with a predetermined fixed priority of the channels which is set in the same order in each of a plurality of base stations respectively arranged in a plurality of cells constituting a service area, in response to a speech communication request from a mobile station;
determining whether or not a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; and
assigning the selected channel as a speech communication channel for the cell when it is determined on the basis of the result of said determining step that the carrier to interference ratio is greater than or equal to the first level, andwherein the step of selecting one of all idle speech communication channels includes a step of repeatedly selecting one of the remaining idle speech communication channels with the next priority when it is determined that the carrier to interference ratio of the selected channel is less than the first level.
0 Assignments
0 Petitions
Accused Products
Abstract
In a channel assignment method for a mobile communication system, each of base stations respectively arranged in a plurality of cells constituting a service area selects one of all speech communication channels in an order of priority common to all the cells in response to a speech communication request from a mobile station. The base station then checks whether the carrier to interference ratio of the selected speech communication channel is equal to or higher than a predetermined level. The selected channel is assigned as a speech communication channel for the cell when it is determined on the basis of the check result that the carrier to interference ratio is equal to or higher than the predetermined level.
-
Citations
25 Claims
-
1. A channel assignment method for a mobile communication system, comprising the steps of:
-
selecting one of all idle speech communication channels in accordance with a predetermined fixed priority of the channels which is set in the same order in each of a plurality of base stations respectively arranged in a plurality of cells constituting a service area, in response to a speech communication request from a mobile station; determining whether or not a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; and assigning the selected channel as a speech communication channel for the cell when it is determined on the basis of the result of said determining step that the carrier to interference ratio is greater than or equal to the first level, and wherein the step of selecting one of all idle speech communication channels includes a step of repeatedly selecting one of the remaining idle speech communication channels with the next priority when it is determined that the carrier to interference ratio of the selected channel is less than the first level. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A channel assignment method for a mobile communication system, comprising the steps of:
-
causing each of a plurality of base stations respectively arranged in a plurality of cells constituting a service area to select, in response to a speech communication request from a mobile station, one of all speech communication channels in an order of priority common to all the cells; causing the base station to check whether a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; assigning the channel as a speech communication channel for the cell when it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the first level, periodically receiving and storing an upstream interference level of a speech communication channel; storing an upstream carrier level in response to a speech communication request; obtaining a propagation loss by subtracting the carrier level from transmission power of a mobile station; obtaining a carrier level of the mobile station by subtracting the propagation loss from transmission power of a base station; and measuring a downstream interference level of a selected speech communication channel.
-
-
8. A channel assignment method for a mobile communication system, comprising the steps of:
-
causing each of a plurality of base stations respectively arranged in a plurality of cells constituting a service area to select, in response to a speech communication request from a mobile station, one of all speech communication channels in an order of priority common to all the cells; causing the base station to check whether a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; assigning the channel as a speech communication channel for the cell when it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the first level; monitoring signal quality of a currently used speech communication channel; checking whether the monitored signal quality is less than a second level; selecting another free speech communication channel of all the speech communication channels in accordance with the common order of priority when it is determined on the basis of the check result that the signal quality is less than the second level; checking whether a carrier to interference ratio of the selected channel is greater than or equal to a third level; and switching the currently used speech communication channel to the selected speech communication channel when it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the third level. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A channel assignment method for a mobile communication system, comprising the steps of:
-
causing each of a plurality of base stations respectively arranged in a plurality of cells constituting a service area to select, in response to a speech communication request from a mobile station, one of all speech communication channels in an order of priority common to all the cells; causing the base station to check whether a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; assigning the channel as a speech communication channel for the cell when it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the first level; and wherein each of the plurality of cells sequentially selects speech communication channels in an order to decrease a difference in carrier frequency from a central value of carrier frequencies of all the speech communication channels.
-
-
19. A channel assignment method for a mobile communication system, comprising the steps of:
-
classifying a plurality of speech communication channels, assigned to perform radio communication between base stations respectively arranged in a plurality of cells constituting a service area and mobile stations in the cells, into first and second groups; classifying speech communication channels of the second group into a plurality of subgroups; allocating to each of the base stations the use of speech communication channels belonging to the first group and speech communication channels belonging to one of the subgroup in the second group; and causing each of the base stations to assign, in response to a mobile station request, one of the speech communication channels belonging to the first group and one of the subgroups in the second group, which are allowed to be used, to a corresponding one of the mobile stations. - View Dependent Claims (20, 21, 22, 23, 24)
-
-
25. A channel assignment method for a mobile communication system in which a service area is constituted by a plurality of cells respectively having base stations arranged therein, and radio speech communication channels are set between the base station and mobile stations in each cell to perform communication, comprising the steps of:
-
sequentially selecting free speech communication channels from all speech communication channels, in response to speech communication requests, in an order of priority common to all the cells; checking whether a carrier to interference ratio of the selected speech communication channel is greater than or equal to a first level; assigning the speech communication channel if it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the first level; monitoring signal quality of a currently used speech communication channel; checking whether the monitored signal quality is less than a second level; selecting a free speech communication channel from all the speech communication channels in the common order of priority if it is determined on the basis of the check result that the signal quality is less than the second level; checking whether a carrier to interference ratio of the selected speech communication channel is greater than or equal to a third level; and switching the currently used speech communication channel to the selected speech communication channel if it is determined on the basis of the check result that the carrier to interference ratio is greater than or equal to the third level.
-
Specification