Method for assigning band port channels in an unlicensed personal communications system

• US 5,822,681 A
• Filed: 01/24/1996
• Issued: 10/13/1998
• Est. Priority Date: 01/24/1996
• Status: Expired due to Term

• Current Assignee: Nytell Software LLC (Intellectual Ventures LLC)
• Original Assignee: Bell Communications Research, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Ranade, Ashok, Sollenberger, Nelson Ray, Chang, Li-Fung, Noerpel, Anthony Robert
• Primary Examiner(s): Urban, Edward F.
• Application Number:
  US08/590,997
• Time in Patent Office: 993 Days
• Field of Search: 455/464, 455/465, 455/452, 455/62, 455/63, 455/161.1, 455/161.3, 455/161.2, 455/509, 455/513, 455/514
• US Class Current: 455/62
• CPC Class Codes: H04W 16/16 for PBS [Private Base Station] arrangements

Abstract

A number of RPs stagger the times in which they begin searching for available channels. In a preferred method, one of a plurality of RPs in a UPCS system is selected to have a first start time. The system determines which RPs in the system can "see" the selected RP. Each of these RPs is given a unique stagger start time. This process may be repeated until each RP in the system is assigned a stagger start time. Alternatively, if there are fewer RPs in the system than there are available stagger start times, each RP may be selected to have a unique stagger start time.

Claims

1. A method for conducting a channel searching procedure for a plurality of radio ports in a wireless communication system using a listen-before-talk etiquette, comprising the steps of:

a. randomly assigning a first stagger start time to one of the plurality of radio ports;

b. the first radio port transmitting at a first frequency;

c. determining which of the plurality of radio ports detect more than the threshold level of the first radio port transmission;

d. assigning a unique stagger start time to each of the plurality of radio ports that can detect more than a threshold level of each others'"'"' transmissions; and

e. each radio port assigned a stagger start time beginning the channel search procedure at its assigned stagger start time.

2. The method of claim 1, the method further comprising after the step of beginning the channel search:

a. assigning the first stagger start to a second radio port that did not detect more than a threshold level of transmission from the first radio port;

b. each radio port not having an assigned stagger start time monitoring the channel search procedure; and

c. for each radio port not yet having an assigned stagger start time, assigning a stagger start time in a manner to not have the same stagger start time as any other radio port that is in interference range.

3. The method of claim 1, wherein the communication system includes a number of communication frames, the method further comprising the step of dividing the communication frames into a number of stagger start intervals prior to the step of assigning unique stagger start times.

4. A method for conducting a channel searching procedure for a plurality of radio ports in a wireless communication system using a listen-before-talk etiquette, comprising the steps of:

a. if a number of available unique stagger start times is greater than a number of total radio ports in the system, assigning to each radio port a unique stagger start time; and

b. if the number of total radio ports in the system is greater than the number of available unique stagger start times, then;

(1) selecting a first radio port to have a first stagger start time;

(2) the first radio port transmitting at a first frequency;

(3) all of the radio ports, except the first radio port, monitoring the first radio port'"'"'s transmission;

(4) determining which radio ports detect more than a threshold level of the first radio port'"'"'s transmission; and

(5) assigning a unique stagger start time to each radio port that detects more than a threshold level of the first radio port'"'"'s transmission; and

c. each radio port assigned a stagger start time transmitting according to the channel search procedure at its assigned stagger start time.

5. The method of claim 4, wherein after the step of assigning a unique stagger start time to each radio port that detects more than a threshold level of the first radio port'"'"'s transmission, the method further comprising the steps of:

a. determining if every radio port in the system has an assigned stagger start time;

b. if every radio port in the system does not have an assigned stagger start time, then;

(1) selecting a second radio port that does not have an assigned stagger start time to have the first stagger start time;

(2) all of the radio ports not having assigned stagger start times monitoring the transmissions of the radio ports having assigned stagger start times;

(3) determining which radio ports not having assigned stagger start times detect more than a threshold level of the transmissions of the radio ports having assigned stagger start times; and

(4) for each radio port not yet having an assigned stagger start time, assigning a stagger start time different from the stagger start times assigned to any other radio ports such radio port can detect more than a threshold level of such other radio port'"'"'s transmission.

6. A method for conducting a channel searching procedure for a plurality of radio ports in a wireless communication system using a listen-before-talk etiquette, wherein the communication system includes a hyperframe comprising a number of superframes, each superframe being divided into a number of time intervals during which radio ports conduct channel searches, the method comprising the steps of:

a. assigning a unique time interval to each of the plurality of radio ports according to STG(RP_j)=(T,S), where;

STG(RP_j)=a channel search time interval for radio port j, where j is an integer from 1 to the total number of radio ports in the system;

T=a position of a channel search time interval in a superframe; and

S=the number of superframes in the hyperframe; and

b. each radio port beginning the channel search procedure at its assigned time interval.