Broadband base station architecture for advanced resource management

• US 6,219,562 B1
• Filed: 10/15/1999
• Issued: 04/17/2001
• Est. Priority Date: 10/15/1998
• Status: Expired due to Term

• Current Assignee: Rateze Remote Mgmt. L.L.C. (Intellectual Ventures LLC)
• Original Assignee: AirNet Communications Corporation (Tecore Incorporated)
• Inventors: Williams, Terry L.
• Primary Examiner(s): Nguyen, Lee
• Assistant Examiner(s): Nguyen, Simon
• Application Number:
  US09/418,630
• Time in Patent Office: 550 Days
• Field of Search: 455/103, 455/132, 455/562, 455/561, 455/507, 370/347, 370/342, 370/441, 370/480, 370/337, 370/338, 370/344, 370/321
• US Class Current: 455/561
• CPC Class Codes: H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
• CPC Class Codes: H04B 1/0092 using a wideband front end
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 1/403 using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
• CPC Class Codes: H04B 7/2646 for broadband transmission
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An apparatus for a cellular communications network including a broadband transceiver for providing upconversion and downconversion between an RF band-of-interest and an intermediate frequency (IF); a transmultiplexer (XMUX) interfacing with the transceiver. The XMUX demultiplexes a single wideband IF receive signal to form a set of individual frequency channels on a receive path of the transceiver, and multiplexes the frequency channels into a single wideband IF transmit signal on a transmit path. The BBS also includes a rate converter processor (RCP) that interfaces with the XMUX for converting at least one of the frequency channels from a first data rate of the XMUX to a second data rate, and a communications bus that transports the modulated IF signals for each of the frequency channels between the RCP and a plurality of channel processors (CP). Each CP processes any of a plurality of traffic channels contained on any of said IF signals. An alternative architecture for the apparatus is disclosed.

Claims

1. A wireless multichannel broadband base station (BBS) for a cellular communications network, comprising:

a broadband transceiver for providing upconversion and downconversion between an RF band of interest and an intermediate frequency (IF);

a transmultiplexer (XMUX) interfacing with said transceiver, said XMUX demultiplexing a single wideband IF receive signal to form a set of individual frequency channels on a receive path of said transceiver, said individual frequency channels comprising a plurality of single data channels, said XMUX also multiplexing said frequency channels into a single wideband IF transmit signal on a transmit path;

a bus interface processor interfacing with said XMUX for converting between at least one of said frequency channels and said plurality of single data channels;

a communications bus transporting modulated baseband signals for each of said plurality of single data channels between said bus interface processor and any of a plurality of channel processors (CP), each CP for processing any of a plurality of traffic channels contained on any of said baseband signals.

2. The BBS according to claim 1 wherein said communications bus is a time division multiplexed (TDM) interface.

3. The BBS according to claim 2 wherein said single data channels multiplexed and demultiplexed by said bus interface processor are each predefined time division multiplexed access (TDMA) time slots, each said time slot defining at least one of said traffic channels and a control channel.

4. The BBS according to claim 3 further comprising a central processor unit, said central processor unit operatively connected to each of said plurality of CPs, said central processor unit selectively allocating any one of said plurality of CPs for processing at least one of any said traffic channel and any said control channel contained on any one of said frequency channels.

5. The BBS according to claim 4 further comprising at least one other broadband transceiver interfacing with said communications bus by way of an second XMUX and a second bus interface processor, said central processor unit selectively allocating any one of said plurality of CPs for processing at least one of any said traffic channel and any said control channel of said second bus interface processor.

6. The BBS according to claim 1 wherein each CP processes at least one of said traffic channels and a control channel.

7. The BBS according to claim 1, wherein said bus interface processor is a rate control processor (RCP), said RCP also converting from a first data rate of said XMUX to a second data rate required for said CPs.

8. The BBS according to claim 7 wherein said RCP resamples said first data rate to achieve a synchronized one-bit per sample required for said CP.

9. The BBS according to claim 7 wherein said first data rate is about at least 320 kilo-samples per second.

10. The BBS according to claim 9 wherein said second data rate is about 270.833 kilo-bits per second.

11. The BBS according to claim 7, wherein said RCP resamples said first data rate to achieve a second data rate equal to an integral multiple of a bit rate required for said CP.

12. The BBS according to claim 7, wherein said first data rate is a data rate required by said XMUX.

13. The BBS according to claim 7, wherein said second data rate is non-synchronous to said first data rate and equal to a symbol rate of said BBS, whereby a modulation scheme having any number of bits per symbol may be supported.

14. The BBS according to claim 1, wherein only active channels of said single data channels are transferred across said communications bus to said plurality of CPs, whereby a processing efficiency of said BBS is enhanced by freeing bandwidth on said communication bus and increasing said CPs'"'"' capacity to process signals by limiting said CP processing capacity to only said active channels.

15. A wireless multichannel broadband base station (BBS) for a cellular communications network, comprising:

a broadband transceiver for providing upconversion and downconversion between an RF band of interest and an intermediate frequency (IF);

a transmultiplexer (XMUX) interfacing with said transceiver, said XMUX demultiplexing a single wideband IF receive signal to form a set of individual frequency channels on a receive path of said transceiver, said individual frequency channels comprising a plurality of TDMA time slots, said XMUX also multiplexing said frequency channels into a single wideband IF transmit signal on a transmit path;

a bus interface processor interfacing with said XMUX for converting between at least one of said frequency channels and said plurality of time slots, said bus interface processor multiplexing and demultiplexing data contained in said plurality of predefined TDMA time slots for at least one of said frequency channels, each said time slot defining at least one of a traffic channel and a control channel;

a time division mulitplexed (TDM) communications bus transporting modulated baseband signals for each of said plurality of time slots between said bus interface processor and any of a plurality of channel processors (CPs), each said CP for processing at least one of any said traffic channels and any said control channel contained on any of said baseband signals, and

a central processor unit, said central processor unit operatively connected to each of said plurality of CPs, said central processor unit selectively allocating any one of said plurality of CPs for processing at least one of any said traffic channel and any said control channel contained on any one of said frequency channels.

16. The BBS according to claim 15, wherein only active channels of said time slots are transferred across said communications bus, whereby a processing efficiency of said BBS is enhanced by freeing bandwidth on said communication bus and increasing said CPs'"'"' capacity to process signals by limiting said CP processing capacity to only said active channels.

17. The BBS according to claim 15, wherein said bus interface processor is a rate control processor (RCP), said RCP also converting from a first data rate of said XMUX to a second data rate required for said CP.