Method and apparatus for rapid assignment of a traffic channel in digital cellular communication systems

• US 7,630,719 B2
• Filed: 04/14/2004
• Issued: 12/08/2009
• Est. Priority Date: 09/22/1998
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Grob, Matthew S., Bender, Paul E., Karmi, Gadi
• Primary Examiner(s): Trinh; Sonny
• Application Number:
  US10/824,920
• Publication Number:
  US 20040190471A1
• Time in Patent Office: 2,064 Days
• Field of Search: 455/403, 455/450, 455/434, 455/509, 455/455, 455/454, 455/464, 455/516, 370/329, 370/342, 370/322, 370/335, 370/341, 370/348, 370/431
• US Class Current: 455/450
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

A method and apparatus for rapidly assigning traffic channels to a plurality of mobile stations in a wide area high-speed packet data cellular communication system. Mobile stations transmit access probes on randomly selected access channels to selected base stations to initiate traffic channel assignments. The access probe comprises a pilot preamble, a traffic channel request, and a pilot/data request channel (DRC). The pilot preamble allows the selected base station to easily detect the access probe transmission. The traffic channel request includes data that identifies the mobile station. Immediately after transmitting the traffic channel request, the mobile station begins communicating with the base station on both the forward and reverse communication links. The selected base station immediately supervises the mobile station'"'"'s transmission power. The mobile station selects from a group of available power control sub-channels. The mobile station selects an available channel and an associated power control sub-channel from the list.

Claims

1. A mobile station operable to communicate wirelessly with a base station, the mobile station comprising:

a processor configured to select an access channel; and

a mobile termination block configured to (a) transmit a pilot preamble and a traffic channel request to a base station on the selected access channel, the traffic channel request comprising a mobile station identifier, and (b) transmit data on a traffic channel identified by the mobile station identifier to the base station without waiting to receive a traffic channel assignment from the base station.

2. The mobile station of claim 1,wherein the processor is further configured to (a) determine which base station is sending a pilot signal which is stronger than any other pilot signal received by the mobile station and (b) select an access channel to send the a pilot preamble and traffic channel request to the determined base station.

3. The mobile station of claim 1, wherein the processor is configured to randomly select the access channel from a plurality of access channels.

4. The mobile station of claim 1, wherein the processor is configured to select the access channel from a list of access channels advertised by the base station.

5. The mobile station of claim 1, wherein the pilot preamble and traffic channel request are masked with a long code access channel cover.

6. The mobile station of claim 1, wherein the pilot preamble comprises a sequence of data that is detectable by the base station.

7. The mobile station of claim 1, wherein the mobile station is configured to register with a wireless system comprising the base station, the wireless system assigning the mobile station identifier and sending the mobile station identifier to the mobile station.

8. The mobile station of claim 1, Wherein the traffic channel request further comprises a transaction identifier, a reference pilot, a pilot strength indicator, and a timer status field.

9. The mobile station of claim 1, wherein the traffic channel request further comprises signal strengths and identities of all base stations having received signal strengths exceeding a threshold.

10. The mobile station of claim 1, wherein the mobile termination block is further configured to transmit a data request channel (DRC) on the traffic channel after transmitting the pilot preamble and traffic channel request on the access channel.

11. The mobile station of claim 10, wherein the data request channel (DRC) is masked with a long code comprising a mobile station identifier (MSI) cover.

12. The mobile station of claim 10, wherein the DRC comprises traffic channel data rate information usable by the mobile station to request a maximum data rate from the base station with which the mobile station can reliably demodulate data.

13. The mobile station of claim 10, wherein the mobile station is configured to continue transmitting the DRC for a pre-defined time period.

14. The mobile station of claim 1, wherein the mobile termination block is further configured to transmit pilot channel information on the traffic channel after transmitting the pilot preamble and traffic channel request on the access channel.

15. The mobile station of claim 14,wherein the pilot channel information is masked with a long code comprising a mobile station identifier (MSI) cover.

16. The mobile station of claim 1, further comprising a receiver configured to receive a traffic channel assignment message transmitted by the base station.

17. The mobile station of claim 1, wherein the mobile termination block is configured to use Code Division Multiple Access (CDMA) to process data for transmission to the base station.

18. The mobile station of claim 1, wherein the mobile termination block is configured to transmit a sequence of pilot preambles and traffic channel requests with increasing power until the traffic channel request is acknowledged by the base station or the sequence ends.

19. The mobile station of claim 1, wherein the processor is further configured to select a power control group from a plurality of power control groups for the mobile termination block to transmit data.

20. An apparatus comprising

a mobile termination block configured to receive page messages via a control channel sent by at least one base station;

and

a processor configured to (a) determine whether one of the page messages is addressed to the apparatus, (b) select a reverse link access channel to transmit a traffic channel request whenever the processor determines a page message is addressed to the apparatus, wherein the mobile termination block is configured to transmit the traffic channel request to a base station using the selected reverse link access channel and transmit data on a traffic channel identified by a mobile station identifier before receiving a channel assignment from the base station.

21. The apparatus of claim 20, wherein the mobile termination block further transmits a pilot preamble along with The traffic channel request to a base. station using the selected reverse link access channel.

22. The apparatus of claim 20, wherein the data transmitted on a traffic channel identified by a mobile station identifier comprises a data request channel (DRC) field.

23. The apparatus of claim 20, wherein the processor selects one of a group of advertised available power control sub-channels for communicating with the base station.

24. The apparatus of claim 20, wherein the processor selects a traffic channel from list of advertised available traffic channels and associated available power control sub-channels for communicating with the base station.

25. A mobile station operable to communicate wirelessly with a base station, the mobile station comprising:

means for selecting an access channel; and

means for (a) transmitting a pilot preamble and a traffic channel request to a base station on the selected access channel, the traffic channel request comprising a mobile station identifier, and (b) transmitting data on a traffic channel identified by the mobile station identifier to the base station without waiting to receive a traffic channel assignment from the base station.