System and method for dynamically assigning channels for wireless packet communications

• US 6,052,594 A
• Filed: 04/30/1997
• Issued: 04/18/2000
• Est. Priority Date: 04/30/1997
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Sollenberger, Nelson Ray, Chuang, Justin Che-I
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): Trinh, Sonny
• Application Number:
  US08/846,712
• Time in Patent Office: 1,084 Days
• Field of Search: 375/200, 455/450, 455/560, 455/561, 455/512, 455/458, 455/452, 455/403
• US Class Current: 455/450
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/563 of the wireless resources

Abstract

A method and system for controlling media access in which a paging message is transmitted from a base station to a wireless station when a data packet is received for downlink transmission to the wireless station. The base station is one of a plurality of base stations and the wireless station is associated with the base station. In response to the paging message, a level of each of a plurality of pilot frequency signals is detected at the wireless station. Each pilot frequency corresponds to a downlink traffic channel and is transmitted by base stations to which the downlink traffic channel is assigned. The wireless station generates a list of preferred traffic channels based on a priority order of traffic channels and on detected levels of the pilot frequency signals, and transmits the list to the associated base station. A downlink traffic channel is assigned for downlink transmitting the received data packet to the wireless station based on the list of preferred traffic channels and updates a channel priority order list at the base station.

Claims

1. A method for controlling media access in a wireless telecommunications network, the telecommunications network including a plurality of base stations and at least one wireless station that is in communication with a base station of the plurality of base stations, the method comprising the steps of:

receiving a paging message at the wireless station when a data packet is pending for downlink transmission to the wireless station;

detecting a level of each of a plurality of pilot frequency signals at the wireless station, each pilot frequency signal corresponding to a downlink traffic channel and being transmitted by each base station of the plurality of base stations to which the downlink traffic channel is assigned;

generating a list of preferred traffic channels based on detected levels of the pilot frequency signals; and

transmitting the list of preferred traffic channels to the base stations;

wherein the step of detecting the level of each of the plurality of pilot frequency signals is based on a fast Fourier transform performed on the plurality of pilot frequency signals;

receiving a downlink traffic channel assignment for the wireless station at the wireless station; and

receiving the data packet at the wireless station using the assigned downlink traffic channel;

wherein the step of generating the list of preferred traffic channels is performed at the wireless station and includes the step of determining the list of preferred traffic channels according to a priority order.

2. The method according to claim 1, wherein each downlink traffic channel includes a timeslot and a traffic carrier frequency.

3. The method according to claim 2, wherein the paging message is received during a first predetermined timeslot of a frame having a plurality of timeslots, and

wherein the list of preferred traffic channels is transmitted during a second predetermined timeslot of the frame.

4. The method according to claim 3, wherein the frame is one of a predetermined number of frames in a superframe.

5. The method according to claim 4, wherein the wireless station is a mobile station.

6. The method according to claim 4, wherein the wireless station is a fixed station.

7. A method for controlling media access in a wireless telecommunications network, the telecommunications network including a plurality of base stations and at least one wireless station that is communicating with a base station of the plurality of base stations, the method comprising the steps of:

transmitting a paging message to the wireless station when a data packet is pending for downlink transmission from the base station to the wireless station;

receiving a list of preferred traffic channels for the wireless station at the base station;

assigning a downlink traffic channel for downlink transmitting the received data packet to the wireless station based on the list of preferred traffic channels;

wherein the step of assigning the downlink traffic channel is based on a list of preferred traffic channels received from each mobile station associated with the base station and having packets pending for downlink transmission;

transmitting the assigned downlink traffic channel to the wireless station;

transmitting the data packet from the base station to the wireless station using the assigned downlink traffic channel;

transmitting a pilot frequency signal corresponding to the assigned downlink traffic channel;

generating a preferred traffic channel priority order list for the wireless station at the base station; and

updating the preferred traffic channel priority order list at the base station based on the list of preferred traffic channels transmitted to the base station.

8. The method according to claim 7, wherein the channel priority order list is for all wireless stations communicating with the base station.

9. The method according to claim 7, wherein each downlink traffic channel includes a timeslot and a traffic carrier frequency.

10. The method according to claim 7, wherein the paging message is transmitted during a first predetermined timeslot of a frame having a plurality of timeslots, and

wherein the list of preferred traffic channels is received during a second predetermined timeslot of the frame.

11. The method according to claim 10, wherein the frame is one of a predetermined number of frames in a superframe,

wherein the plurality of base stations are grouped into the predetermined number of groups, each group of base stations being associated with a frame of the superframe, and

wherein the steps of the method are performed by the base stations of a group of base stations during the frame associated with the group.

12. The method according to claim 11, wherein the base stations of each group of base stations are geographically separated from other base stations of the group for minimizing co-channel interference between base stations of the group.

13. The method according to claim 12, wherein the wireless station is a mobile station.

14. The method according to claim 12, wherein the wireless station is a fixed station.