Configuration of overhead channels in a mixed bandwidth system

• US 8,095,142 B2
• Filed: 11/05/2008
• Issued: 01/10/2012
• Est. Priority Date: 04/23/1999
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jou, Yu-Cheun
• Primary Examiner(s): Lee, John J
• Application Number:
  US12/265,564
• Publication Number:
  US 20090059893A1
• Time in Patent Office: 1,161 Days
• Field of Search: 455/450, 455/452.1, 455/509, 455/452.2, 455/453, 455/414.1, 455/463, 455/464, 455/455, 455/502, 455/516, 455/517, 370/329, 370/278, 370/335, 370/342, 370/215
• US Class Current: 455/452.1
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for the Sync Channel transmission instead of the preferred channels for the entire multi-carrier system. The Sync Channel Message will carry additional information indicating the center frequency of a multi-carrier system within a reserved set of frequency bands and indicating the frequency of a single carrier system in the reserved set of frequency bands. Considering the A block of the PCS band again, the preferred channels for Sync Channel transmission can be selected as channels 75, 150 and 225. This selection ensures that one of the preferred channels will always be used by any multi-carrier system regardless of the location of its center channel.

Claims

1. A mobile station adapted to acquire a sync channel message using a wireless device operable in at least one of a single carrier mode in a single carrier system and a multi-carrier mode in a multi-carrier system, comprising:

a first receive subsystem for receiving some data components of forward link data comprising a sync channel message on at least one of a set of preferred frequency channels included within a predetermined set of frequencies in a personal communications system (PCS) block of frequencies; and

at least one additional receive subsystem comprising multiple bands of adjacent of said frequency channels each said band including said one of a set of preferred frequency channels for simultaneously receiving remaining components of said forward link data.

2. The mobile station of claim 1, wherein said sync channel message indicates the frequency of a single carrier system in said set of frequencies.

3. The mobile station of claim 1, wherein said sync channel message indicates the center frequency of at least one multi-carrier system in said set of frequencies.

4. The mobile station of claim 3, wherein said set of a preferred frequency channels have channel numbers comprising 75, 150 and 225, and wherein the number of frequency channels in said set of preferred frequency channels is less number of frequencies in the predetermined set of frequencies.

5. A method of acquiring a sync channel message using a wireless device operable in at least one of a single carrier mode in a single carrier system and a multi-carrier mode in a multi-carrier system, comprising:

defining a predetermined set of frequencies that each have a channel number associated with a band; and

tuning to preferred channel numbers until a sync channel message is received on a single 1×

band, wherein any combination of three adjacent channel numbers includes a preferred channel number upon which the wireless device can receive the sync channel message.

6. The method according to claim 5, wherein tuning to preferred channel numbers until a sync channel message is received, comprises:

attempting to receive the sync channel message by tuning to a first preferred channel number located on one of a group of bands including the first through third bands; and

if the sync channel message is not received on the group of bands including the first through third bands, attempting to receive the sync channel message by tuning to the first preferred channel number located on one of a group of bands including the second through fourth bands.

7. The method according to claim 6, further comprising:

if the sync channel message is not received on the group of bands including the second through fourth bands, attempting to receive the sync channel message by tuning to a second preferred channel number located on one of a group of bands including the third through fifth bands.

8. The method according to claim 7, further comprising:

if the sync channel message is not received on the group of bands including the third through fifth bands, attempting to receive the sync channel message by tuning to the second preferred channel number located on one of a group of bands including the fourth through sixth bands.

9. The method according to claim 5, wherein the sync channel message is received if:

a detector in the wireless device detects a pilot signal on a band that includes a preferred channel number; and

a receiver in the wireless device receives, demodulates, and decodes the sync channel message.

10. A wireless device operable in at least one of a single carrier mode in a single carrier system and a multi-carrier mode in a multi-carrier system, comprising:

means for storing a predetermined set of frequencies that each have a channel number associated with a band; and

means for tuning to preferred channel numbers until a sync channel message is received on a single 1×

band, wherein any combination of three adjacent channel numbers includes a preferred channel number upon which the wireless device can receive the sync channel message.

11. The wireless device according to claim 10, wherein the means for tuning to preferred channel numbers until a sync channel message is received, comprises:

means for attempting to receive the sync channel message by tuning to a first preferred channel number located on one of a group of bands including the first through third bands, and, if the sync channel message is not received on the group of bands including the first through third bands, tuning to the first preferred channel number located on one of a group of bands including the second through fourth bands.

12. The wireless device according to claim 11, if the sync channel message is not received on the group of bands including the second through fourth bands, wherein the means for attempting to receive the sync channel message tunes to a second preferred channel number located on one of a group of bands including the third through fifth bands.

13. The wireless device according to claim 12, if the sync channel message is not received on the group of bands including the third through fifth bands, wherein the means for attempting to receive the sync channel message tunes to the second preferred channel number located on one of a group of bands including the fourth through sixth bands.

14. The wireless device according to claim 10, wherein the sync channel message is received if:

a detector in the wireless device detects a pilot signal on a band that includes a preferred channel number; and

a receiver in the wireless device receives, demodulates, and decodes the sync channel message.

15. A method for acquiring a sync channel message using a wireless device operable in at least one of a single carrier mode in a single carrier system and a multi-carrier mode in a multi-carrier system, comprising:

receiving some data components of forward link data comprising a sync channel message on at least one of a set of preferred frequency channels included within a predetermined set of frequencies in a personal communications system (PCS) block of frequencies; and

simultaneously receiving remaining components of said forward link data comprising multiple bands of adjacent of said frequency channels each said band including said one of a set of preferred frequency channels.

16. The method of claim 15, wherein said sync channel message indicates the frequency of a single carrier system in said set of frequencies.

17. The method of claim 15, wherein said sync channel message indicates the center frequency of at least one multi-carrier system in said set of frequencies.

18. The method of claim 17, wherein said set of a preferred frequency channels have channel numbers comprising 75, 150 and 225, and wherein the number of frequency channels in said set of preferred frequency channels is less number of frequencies in the predetermined set of frequencies.

19. An apparatus for acquiring a sync channel message using a wireless device operable in at least one of a single carrier mode in a single carrier system and a multi-carrier mode in a multi-carrier system, comprising:

means for receiving some data components of forward link data comprising a sync channel message on at least one of a set of preferred frequency channels included within a predetermined set of frequencies in a personal communications system (PCS) block of frequencies; and

means for simultaneously receiving remaining components of said forward link data comprising multiple bands of adjacent of said frequency channels each said band including said one of a set of preferred frequency channels.

20. The apparatus of claim 19, wherein said sync channel message indicates the frequency of a single carrier system in said set of frequencies.

21. The apparatus of claim 19, wherein said sync channel message indicates the center frequency of at least one multi-carrier system in said set of frequencies.

22. The apparatus of claim 21, wherein said set of a preferred frequency channels have channel numbers comprising 75, 150 and 225, and wherein the number of frequency channels in said set of preferred frequency channels is less number of frequencies in the predetermined set of frequencies.