US 5,734,646 A · Code division multiple access system providing load and interference based demand assignment service to users

Abstract

A code division multiple access system provides a way of allocating an increased data rate to a requesting mobile station. A mobile station requesting a data rate in excess of the basic data rate sends received pilot strength data for its base station and base stations in adjacent cells. The received pilot strength data is used to determine an increased data rate to be assigned to the requesting mobile station. One feature assigns an increased data rate when the received pilot strength data has a predetermined relationship to an established threshold. Another feature utilizes a series of threshold levels, each pair of levels associated with a different permitted data rate. Using the received pilot strength data, a data rate is determined which satisfies all adjacent cell interference concerns. Another feature uses average adjacent cell capacity loads rather than threshold levels, together with the received pilot strength data, to determine the appropriate increased data rate to be assigned to a user requesting an increased data rate.

Claims25

Dependent claims

In a code division multiple access system including multiple cells, each cell having a base station and multiple mobile stations, a method of allocating bandwidth to a mobile station comprising the steps of:

receiving, at a base station of a first cell, a data burst request from an active mobile station of said first cell requesting a first data rate in excess of the basic data rate (B) allocated to that mobile station, said data burst request including pilot strength information for the base station of said first cell and a base station of at least one cell adjacent to said first cell;
at an access controller, using the received pilot strength information to determine an increased data rate which is to be granted to said requesting mobile station without causing excessive interference at said first cell and said at least one adjacent cell;
and
transmitting a data burst assignment response from the access controller to said requesting mobile station indicating the increased data rate which has been granted to said requesting mobile station.

1 more element

A code division multiple access system including multiple cells, each cell having a base station and multiple mobile stations, the system comprising:

receiving means, at a base station of a first cell, receiving a data burst request from an active mobile station of said first cell requesting a first data rate in excess of the basic data rate (B) allocated to that mobile station, said data burst request including pilot strength information for the base station of said first cell and a base station of at least one cell adjacent to said first cell;
and
an access controller, using the received pilot strength information to determine an increased data rate which is to be granted to said requesting mobile station without causing excessive interference at said first cell and said at least one adjacent cell and transmitting a data burst assignment response to said requesting mobile station indicating the increased data rate which has been granted to said requesting mobile station.

Dependencies are inferred from the claim text.

Code division multiple access system providing load and interference based demand assignment service to users

Life of this patent

Code division multiple access system providing load and interference based demand assignment service to users

Life of this patent

Abstract

Claims25