Method, base station and mobile station for timeslot selection and timeslot assignment

• US 7,116,983 B2
• Filed: 05/25/2004
• Issued: 10/03/2006
• Est. Priority Date: 11/04/1999
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Lan, Chen, Umeda, Narumi
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): Au, Gary
• Application Number:
  US10/852,181
• Publication Number:
  US 20040214582A1
• Time in Patent Office: 861 Days
• Field of Search: 455/522, 455/450, 455/452.1
• US Class Current: 455/452.2
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A timeslot selection method is provided. The timeslot selection method includes the steps of: obtaining a propagation loss; receiving an occupation state and an interference amount of an uplink timeslot; obtaining a desired wave power from the propagation loss; obtaining a ratio between the desired wave power and the propagation loss for the uplink timeslot in which the occupation state is idle; and selecting the transmitting timeslot by using the ratio. In addition, a timeslot assignment method in which there are a plurality of TDD boundaries each of which is a boundary between at least an uplink timeslot and at least a downlink timeslot in a frame is provided. Furthermore, a timeslot assignment method is provided, in which assignment is carried out according to a service class included in a QoS request.

Claims

1. A timeslot selection method in which a mobile station selects a transmitting timeslot used by said mobile station in a wireless packet transmission system where said mobile station communicates with a base station, said timeslot selection method comprising the steps of:

obtaining a propagation loss of a received signal in said mobile station based on a transmission power of said base station and a received power of said received signal received from said base station;

receiving an occupation state and an interference amount of an uplink timeslot from said base station;

obtaining a desired wave power of said base station from a transmission power of said mobile station and said propagation loss;

obtaining a ratio between said desired wave power and said interference amount in said base station for said uplink timeslot in which said occupation state is idle; and

selecting an idle timeslot, as a transmission timeslot, which has the lowest ratio between said desired wave power and said interference amount among idle timeslots each of which idle timeslots satisfies a predetermined ratio between desired wave power and said interference amount.

2. A mobile station in a wireless packet transmission system where said mobile station communicates with a base station, said mobile station comprising:

means for obtaining a propagation loss of a received signal in said mobile station based on a transmission power of said base station and a received power of said received signal received from said base station;

means for receiving an occupation state and an interference amount of an uplink timeslot from said base station;

means for obtaining a desired wave power of said base station from a transmission power of said mobile station and from said propagation loss;

means for obtaining a ratio between said desired wave power and said interference amount in said base station for said uplink timeslot in which said occupation state is idle; and

means for selecting an idle timeslot, as a transmission timeslot, which has the lowest ratio between said desired wave power and said interference amount among idle timeslots each of which idle timeslots satisfies a predetermined ratio between desired wave power and said interference amount.

3. The mobile station as claimed in claim 2, wherein said means for selecting comprising:

means for selecting an idle timeslot which has the lowest ratio between said desired wave power and said propagation loss among idle timeslots each of which idle timeslots satisfies a predetermined ratio between desired wave power and propagation loss.

4. A base station in a wireless packet transmission system where said base station communicates with a mobile station, said base station comprising:

means for measuring an occupation state and an interference amount of an uplink timeslot;

means for sending said occupation state and said interference amount of said uplink timeslot to said mobile station;

means for receiving a number of remaining information units and a propagation loss from said mobile station;

means for obtaining an interference amount by using said propagation loss and a receive level when said number of remaining information units is zero; and

means for sending said interference amount to said mobile station.

5. A wireless packet transmission system comprising a mobile station and a base station where said mobile station communicates with said base station:

said mobile station comprising;

means for obtaining a propagation loss of a received signal in said mobile station based on a transmission power of said base station and a received power of said received signal received from said base station;

means for receiving an occupation state and an interference amount of an uplink timeslot from said base station;

means for obtaining a desired wave power of said base station from a transmission power of said mobile station and from said propagation loss;

means for obtaining a ratio between said desired wave power and said interference amount in said base station for said uplink timeslot in which said occupation state is idle; and

means for selecting an idle timeslot, as a transmission timeslot, which has the lowest ratio between said desired wave power and said interference amount among idle timeslots each of which idle timeslots satisfies a predetermined ratio between desired wave power and said interference amount,

said base station comprising;

means for measuring said occupation state and said interference amount of said uplink timeslot; and

means for sending said occupation state and said interference amount of said uplink timeslot to said mobile station.

6. The wireless packet transmission system as claimed in claim 5, said means for selecting comprising:

means for selecting an idle timeslot which has the lowest ratio between said desired wave power and said propagation loss among idle timeslots each of which idle timeslots satisfies a predetermined ratio between desired wave power and propagation loss.