Base station which selectively utilizes B and D channels to support a plurality of communications

• US 6,930,991 B2
• Filed: 12/20/2001
• Issued: 08/16/2005
• Est. Priority Date: 06/16/1997
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M.
• Primary Examiner(s): QURESHI, AFSAR M
• Application Number:
  US10/028,832
• Publication Number:
  US 20020080744A1
• Time in Patent Office: 1,335 Days
• Field of Search: 370/320, 370/329, 370/335, 370/341, 370/431, 370/468, 370/342, 370/441, 370/524, 370/230, 370/232, 370/234, 370/235, 370/522, 370/328, 455/450, 455/452, 455/454, 455/455
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04J 3/16 in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted H04J3/17, H04J3/24 take precedence
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04Q 11/0435 Details
• CPC Class Codes: H04Q 2213/1307 Call setup
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13174 Data transmission, file transfer
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13208 Inverse multiplexing, channel bonding, e.g. TSSI aspects
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13294 CDMA, code division multiplexing, i.e. combinations of H04Q2213/13291 and/or H04Q2213/13292 with space division
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 76/30 : Connection release
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A CDMA wireless digital communication system which supports all types of voice and data communications while utilizing the minimum amount of bandwidth for the particular application. The system efficiently allocates ISDN bandwidth on demand by a subscriber. Upon initialization of the subscriber unit, the system establishes a channel and generates the necessary spreading codes to support the highest capacity channel desired by the subscriber unit. Portions of the communication spectrum bandwidth are not reserved until actually required by the subscriber unit. Since the call setup is performed at the beginning of a call from that subscriber unit, including the assignment of spreading codes, a subscriber unit can quickly gain access to the portion of the spectrum that is required to support the particular application.

Claims

1. A wireless digital code division multiple access (CDMA) base station for supporting modification of data communication rates required by users, the base station comprising:

means for establishing transmission channels having predetermined data rates;

means for allocating at least one of said transmission channels to support a communication;

means for transmitting said communication at an initial data communication rate using said allocated transmission channel;

means for monitoring said communication and determining an adjusted data rate for continued support of said communication;

means for re-allocating said transmission channels to support said communication based on the adjusted data rate, such that the sum of the data rates of the allocated channels is at least equal to the adjusted data rate and is not greater than the adjusted data rate plus a predetermined limit; and

means for continuing the transmission of said communication within said allocated channels, whereby said base station dynamically modifies said data communication rates by re-allocating transmission channels during said communication.

2. The base station of claim 1 wherein said establishing means establishes D channels at a first data rate and B channels at a second data rate, which is greater than said first data rate.

3. The base station of claim 2 wherein said first data rate is 16 kb/s and said second data rate is 64 kb/s.

4. The base station of claim 3 wherein said communication is an ISDN communication and said allocating means allocates at least one D channel and a sufficient number of B channels for continued transmission of the communication from said base station, and said predetermined limit is equal to said second data rate.

5. The base station of claim 2 wherein said communication is an ISDN communication and said allocating means allocates at least one D channel and a sufficient number of B channels for continued transmission of the communication from said base station, and said predetermined limit is equal to said second data rate.

6. The base station of claim 1 further including assignment means for assigning channel codes to said transmission channels.

7. The base station of claim 6, whereby said channel codes are assigned in sets, and whereby allocating means only allocates transmission channels having channel codes from the same set to a single communication.

8. The base station of claim 1 further including:

means for establishing return channels, having predetermined data transmission rates that may be different from said predetermined data rates of said transmission channels;

means for monitoring a return communication and determining a desired return data rate;

means for allocating, responsive to said monitoring means, a sufficient number of return channels for said return communication such that the total data rate of the allocated return channels is at least equal to the desired return data rate and is not greater than the desired return data rate plus a second predetermined limit; and

means for receiving the return communication within said allocated return channels.

9. The base station of claim 8 wherein said return establishing means establishes return D channels at a third data rate and return B channels at a fourth data rate, which is greater than said third data rate.

10. The base station of claim 9 wherein said third data rate is 16 kb/s and said fourth data rate is 64 kb/s.

11. The base station of claim 9 wherein said return communication is an ISDN communication and said allocating means allocates at least one D channel and a sufficient number of B channels.

12. A wireless digital base station for supporting a plurality of communication rates using a plurality of communication channels, the base station comprising:

first means for processing a first communication for transmission, including first means for determining a first data rate required to support said first communication;

means for allocating a sufficient number of communication channels for transmission at said first data rate, said allocating means being responsive to said first determining means; and

means for monitoring said first determining means to initiate re-allocation of communication channels to change the first data rate.

13. The base station of claim 12 wherein said communication channels include D channels at a first data rate and B channels at a second data rate, which is greater than said first data rate.

14. The base station of claim 13 wherein said first data rate is 16 kb/s and said second date rate is 64 kb/s.

15. The base station of claim 12 wherein sets of assigned channel codes are assigned to a subset of said plurality of said communication channels, and said allocating means allocates communication channels from the same subset to a single communication.

16. The base station of claim 15 further including:

means for establishing a return communication channel including means for monitoring a return communication and determining a desired return data rate;

means for allocating a sufficient number of return channels for the return communication based on the desired return data rate such that the total data rate of the allocated return channels is at least equal to the desired return data rate and is not greater than the desired return data rate plus a predetermined return limit; and

means for receiving the returns communication within said allocated return channels.

17. The base station of claim 16 wherein said first data rate is 16 kb/s and said second date rate is 64 kb/s.

18. The base station of claim 16, whereby if the return communication is an ISDN communication, said allocating means allocates at least one D channel and a sufficient number of B channels.