Apparatus, system, and method for autonomously managing reverse link communication resources in a distributed communication system

• US 7,158,796 B2
• Filed: 06/08/2004
• Issued: 01/02/2007
• Est. Priority Date: 06/16/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Chen, Tao, Jain, Avinash
• Primary Examiner(s): Eng; George
• Assistant Examiner(s): Stein; Julie E
• Application Number:
  US10/864,652
• Publication Number:
  US 20050037771A1
• Time in Patent Office: 938 Days
• Field of Search: 455/453, 455/445, 455/450, 455/452, 455/67.11, 455/423, 370/328, 370/329
• US Class Current: 455/453
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An apparatus, system, and method efficiently manage reverse link communication in a communication system having geographically distributed base stations. A base station functioning to at least one mobile station as a non-serving active base station estimates an expected coupled load due to the at least one mobile based on a previous total coupled load. The base station determines a total available capacity based on the difference between the total capacity of the base station and the estimated expected coupled load. The base station allocates reverse link resources to other mobile stations served by the base station so as not to exceed the total available capacity. Since the allocation of reverse link channels resources are controlled directly by the base station, delays due to communications with a central controller are eliminated. As a result, adverse effects of load scheduling based on obsolete reverse channel information are minimized.

Claims

1. A method, performed in a base station functioning as a non-serving base station to at least one mobile station served by another base station, for allocating reverse link resources to mobile stations served by the base station in a distributed base station communication system, the method comprising:

measuring coupled load parameters of reverse link transmissions of the at least one mobile station served by another base station;

calculating an estimated expected coupled load due to reverse link transmissions of the at least one mobile station based on the coupled load parameters;

allocating reverse link resources to other mobile stations served by the base station in accordance with the estimated expected coupled load;

wherein the allocating the reverse link resources comprises scheduling data transmission rates to the other mobile stations served by the base station to create a total reverse link load due to the other mobile stations at the base station not exceeding a difference of a total capacity of the base station and the estimated expected coupled load;

wherein the estimating comprises calculating a previous coupled load due to the reverse link transmissions of the at least one mobile station based on the measured coupled load parameters measured during a previous transmission period, calculating the estimated expected coupled load based on the previous coupled

wherein the calculating the estimated expected coupled load comprises calculating the estimated expected coupled load to be equal to the previous coupled load;

wherein the calculating the previous coupled load comprises calculating a plurality of previous coupled loads;

wherein the calculating the estimated expected coupled load further comprises calculating a filtered avenged total expected coupled load of the plurality of previous coupled loads.

2. A method in accordance with claim 1, wherein the measuring the coupled load parameters comprises measuring an energy-per-chip-to-noise-plus-interference ratio (E_cp/N_t).

3. A method in accordance with claim 2, wherein calculating the estimated expected coupled load further comprises calculating the estimated expected coupled load based on a transmission data rate of reverse link signals transmitted by the at least one mobile station.

4. A method in accordance with claim 2, wherein calculating the estimated expected coupled load further comprises calculating the estimated expected coupled load based on a transmission power level of reverse link signals transmitted by the at least one mobile station.

5. A method, performed in a base station in a distributed base station communication system, the method comprising:

measuring coupled load parameters of reverse link transmissions of mobile stations served by other base stations;

calculating a total coupled load for a previous transmission period based on the coupled load parameters, the total coupled load representing a total load contribution due to reverse link transmissions of the mobile stations;

calculating an estimated expected coupled load for a current transmission based on the total coupled load;

calculating a total available capacity of the base station by subtracting the estimated expected coupled load from a total capacity of the base station; and

allocating reverse link resources to other mobile stations served by the base station in accordance with the total available capacity;

wherein the allocating the reverse link resources comprises scheduling data transmission rates to the other mobile stations served by the base station to create a total reverse link load due to the other mobile stations at the base station not exceeding the total available capacity of the base station;

wherein the calculating the estimated expected coupled load comprises calculating the estimated expected coupled load to be equal to the previous coupled load;

wherein the calculating the previous coupled load comprises calculating a plurality of previous coupled loads;

wherein the calculating the estimated expected coupled load further comprises calculating a filtered averaged total expected coupled load of the plurality of previous coupled loads.

6. A method in accordance with claim 5, wherein the measuring the coupled load parameters comprises measuring an energy-per-chip-to-noise-plus-interference ratio (E_cp/N_t).

7. A method in accordance with claim 6, wherein calculating the estimated expected coupled load for the current transmission further comprises calculating the estimated expected coupled load for the current transmission based on a transmission data rate of reverse link signals transmitted by the at least one mobile station.

8. A method in accordance with claim 7, wherein calculating the estimated expected coupled load for the current transmission further comprises calculating the estimated expected coupled load for the current transmission based on a transmission power level of the reverse link signals transmitted by the at least one mobile station.

9. A processor for a base station of a distributed base station communication system the processor configured to:

calculate a total coupled load due to reverse link transmissions of mobile stations served by other base stations for a previous transmission period based on the coupled load parameters measured at the base station;

calculate an estimated expected coupled load for a current transmission period based on the total coupled load; and

calculating a total available capacity of the base station by subtracting the estimated expected coupled load from a total capacity of the base station;

wherein the processor further configured to allocate reverse link resources to other mobile stations served by the base station in accordance with the total available capacity;

wherein the processor is further configured to allocate the reverse link resources by scheduling data transmission rates to the other mobile stations served by the base station to create a total reverse link load due to the other mobile stations at the base station not exceeding the total available capacity of the base station;

wherein the processor is further configured to calculate the estimated expected coupled load by calculating the estimated expected coupled load to be equal to the previous coupled load;

wherein the processor is further configured to calculate the total coupled load by calculating a plurality of previous coupled loads;

wherein the processor is further configured to calculate the estimated expected coupled load by calculating a filtered averaged total expected coupled load of the plurality of previous coupled loads.

10. A processor in accordance with claim 9, wherein the coupled load parameters comprise an energy-per-chip-to-noise-plus-interference ratio (E_cp/N_t).

11. A processor in accordance with claim 9, wherein the processor is further configured to calculate the estimated expected coupled load for the current transmission period based on a transmission data rate of reverse link signals transmitted by the at least one mobile station.

12. A processor in accordance with claim 9, wherein the processor is further configured to calculate the estimated expected coupled load for the current transmission period based on a transmission power level of reverse link signals transmitted by the at least one mobile station.