Cellular/PCS CDMA system with increased sector capacity

• US 6,654,364 B1
• Filed: 02/16/1999
• Issued: 11/25/2003
• Est. Priority Date: 02/16/1999
• Status: Expired due to Term

• Current Assignee: Sprint Spectrum LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Mansour, Nagi A.
• Primary Examiner(s): NGUYEN, DUC M
• Application Number:
  US09/250,588
• Time in Patent Office: 1,743 Days
• Field of Search: 370/328, 370/329, 370/335, 370/342, 370/441, 370/334, 455/446, 455/447, 455/450-454, 455/561, 455/562, 455/509
• US Class Current: 370/342
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• 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 13/004 Orthogonal

Abstract

A CDMA cellular/PCS telecommunications cell of increased capacity includes a plurality of sectors controlled by a base station unit using a defined set of CDMA codes for each sector. Cell capacity is increased by using two antennas for each sector corresponding to two subsectors with each using a subset of the CDMA codes defined for the sector and with each subset including a pilot channel.

Claims

1. In a CDMA cellular/PCS telecommunications network, a telecommunications cell comprising:

an antenna site configured into a plurality of sectors and including antenna means for transmission and reception of CDMA cellular/PCS telecommunications traffic for said sectors;

a base station unit coupled with said antenna means and including means for controlling transmission and reception over said antenna means using selected ones of a defined set of sixty-four CDMA Walsh codes for each of said sectors;

said antenna means including, for a selected sector, a plurality of antennas oriented to configure said selected sector into two subsectors;

said base station unit including means for controlling telecommunications traffic for said selected sector over said plurality of antennas using two different subsets of said defined set of CDMA codes for said respective subsectors, with each subsector using a different pilot channel and synchronization channel;

a first one of the subsectors using channel 0 as a first pilot channel and channel 32 as a first synchronization channel; and

a second one of the subsectors using channel 33 as a second pilot channel and channel 64 as a second synchronization channel.

2. The cell as set forth in claim 1, said antenna site including three of said sectors with each of said sectors including two antennas configuring each of said sectors into two subsectors covering 60 degrees each.

3. In a CDMA cellular/PCS telecommunications network, a telecommunications cell comprising:

an antenna site configured into a plurality of sectors and including antenna means for transmission and reception of CDMA cellular/PCS telecommunications traffic for said sectors;

a base station unit coupled with said antenna means and including means for controlling transmission and reception over said antenna means using selected ones of a defined set of CDMA codes for each of said sectors;

said antenna means including, for a selected sector, a plurality of antennas oriented to configure said selected sector into two subsectors;

said base station unit including means for controlling telecommunications traffic for said selected sector over said plurality of antennas using a two different subsets of said defined set of CDMA codes for said respective subsectors;

a first one of the subsectors using channel 0 as a first pilot channel and channel 32 as a first synchronization channel; and

a second one of the subsectors using channel 33 as a second pilot channel and channel 64 as a second synchronization channel.

4. In a CDMA cellular/PCS telecommunications network, a telecommunications cell comprising:

an antenna site configured into a plurality of sectors and including antenna means for transmission and reception of CDMA cellular/PCS telecommunications traffic for said sectors;

a base station unit coupled with said antenna means and including means for controlling transmission and reception over said antenna means using selected ones of a defined set of CDMA codes for each of said sectors;

said antenna means including, for a selected sector, a plurality of antennas oriented to configure said selected sector into two subsectors;

said base station unit including means for controlling telecommunications traffic for said selected sector over said plurality of antennas using a two different subsets of said defined set of CDMA codes for said respective subsectors;

a first one of the subsectors using a first pilot channel, a first synchronization channel, and a first plurality of traffic channels;

a second one of the subsectors using a second pilot channel, a second synchronization channel, and a second plurality of traffic channels; and

wherein the first pilot channel is different than the second pilot channel and the first synchronization channel is different than the second synchronization channel.