Physical random access channel for slotted wireless communication systems

• US 20040208136A1
• Filed: 04/29/2004
• Published: 10/21/2004
• Est. Priority Date: 12/19/2000
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Dick, Stephen G., Iacono, Ana Lucia, Stern-Berkowitz, Janet
• Application Number:
  US10/835,515
• Publication Number:
  US 20040208136A1
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]
• CPC Class Codes: H04B 7/2637 for logical channel control
• CPC Class Codes: H04B 7/2653 for logical channel control
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: H04W 74/0891 for synchronized access

Abstract

In one embodiment, a physical random access channel (PRACH) is used in communicating in a slotted wireless communication system. The slotted system uses repeating radio frame structure for communication. The PRACH is associated with a set of characteristics comprising: a set of channelization codes associated with the PRACH; at least one time slot associated with the PRACH; and a set of subchannels associated with the PRACH, the subchannels associated with a single time slot of the radio frames. In another embodiment, access service classes (ASCs) are separted in a wireless slotted communication system. Each ASC is associated with a unique set of channelization codes and subchannels of a physical random access channel (PRACH). The subchannels are associated with a single time slot of radio frames of the wireless slotted communication system.

Claims

3-1. The PRACH of claim 1 wherein a number of the subchannels is N and N has a value of either 1, 2, 4 or 8.

5. A method for separating access service classes (ASCs) in a wireless slotted communication system, the method comprising:

assigning each ASC with a unique set of channelization codes and subchannels of a physical random access channel (PRACH), the subchannels associated with a single time slot of radio frames of the wireless slotted communication system.

6. The method of claim 5 wherein the unique set of channelization codes and subchannels of the PRACH define a partition of that PRACH.

7. The method of claim 5 wherein the radio frames have system frame numbers (SFNs) and each subchannel is associated with specified ones of the SFNs.

8. The method of claim 5 wherein the associating each subchannel is by a modulo counting of the SFNs.

9. The method of claim 8 wherein a number of the subchannels is N and N has a value of either 1, 2, 4 or 8.

10. The method of claim 9 wherein an i^th subchannel is associated with a SFN by i=SFN mod N. N.