Efficient and consistent wireless downlink channel configuration
A method of wireless communication including a base station transmitting a preamble including information indicating a sector identifier and an antenna port value. The base station further transmits a pilot sequence, wherein the pilot sequence and the location of the pilot sequence are based on the sector identifier and on the antenna port value. A base station configured to perform the method is also disclosed. A corresponding subscriber station configured to receive the preamble and pilot sequence is also disclosed, as well as a subscriber station method.
1 . A method comprising:
transmitting, by a base station, an orthogonal frequency division multiple access (OFDM) signal, for use by a client station in cell search, the OFDM signal including a primary signal, a secondary signal and a pilot signal, the primary signal having a first pseudo random sequence, the secondary signal having a second pseudo random sequence and the pilot signal having a third pseudo random sequence;
wherein:
the first pseudo random sequence of the primary signal and the second pseudo random sequence of the secondary signal are based on an identity of a cell associated with the base station; and
the third pseudo random sequence of the pilot signal is based on an antenna configuration identification and the identity of the cell associated with the base station.
2 . The method of claim 1 wherein the primary signal is a primary preamble and the secondary signal is a secondary preamble.
3 . The method of claim 1 wherein the primary signal and the secondary signal are transmitted in a predetermined bandwidth that is different than a bandwidth of the cell associated with the base station.
4 . The method of claim 1 further comprising:
transmitting, by the base station, a second OFDM signal, the second OFDM signal including a second primary signal, a second secondary signal and a second pilot signal, the second primary signal having the first pseudo random sequence, the second secondary signal having the second pseudo random sequence and the second pilot signal having a fourth pseudo random sequence different from the third pseudo random sequence;
wherein the fourth pseudo random sequence is based on at least a second antenna configuration identification, and wherein the second antenna configuration identification is different than the antenna configuration identification upon which the third pseudo random sequence is based.
5 . The method of claim 1 wherein a bandwidth of the OFDM signal is fixed for a plurality of frames and is less than a bandwidth of the cell associated with the base station.
6 . The method of claim 1 wherein the OFDM signal is sent to the client station for synchronization with the base station and acquisition of system information.
7 . The method of claim 6 wherein the system information is included in a physical broadcast channel.
8 . The method of claim 1 wherein the primary signal spans an OFDM symbol and the secondary signal spans an OFDM signal.
9 . The method of claim 1 wherein the first pseudo random sequence conveys, at least in part, the identity of the cell associated with the base station.
10 . The method of claim 1 wherein at least one of the first, second, or third pseudo random sequence is an M-sequence.
11 . A base station comprising:
a processor; and
a transmitter operably coupled to the processor;
the processor and transmitter configured to transmit an orthogonal frequency division multiple access (OFDM) signal, for use by a client station in cell search, the OFDM signal including a primary signal, a secondary signal and a pilot signal, the primary signal having a first pseudo random sequence, the secondary signal having a second pseudo random sequence and the pilot signal having a third pseudo random sequence;
wherein:
the first pseudo random sequence of the primary signal and the second pseudo random sequence of the secondary signal are based on an identity of a cell associated with the base station; and
the third pseudo random sequence of the pilot signal is based on an antenna configuration identification and the identity of the cell associated with the base station.
12 . The base station of claim 11 wherein the primary signal is a primary preamble and the secondary signal is a secondary preamble.
13 . The base station of claim 11 wherein the primary signal and the secondary signal are transmitted in a predetermined bandwidth that is different than a bandwidth of the cell associated with the base station.
14 . The base station of claim 11 , wherein the processor and transmitter are further configured to:
transmit a second OFDM signal, the second OFDM signal including a second primary signal, a second secondary signal and a second pilot signal, the second primary signal having the first pseudo random sequence, the second secondary signal having the second pseudo random sequence and the second pilot signal having a fourth pseudo random sequence different from the third pseudo random sequence;
wherein the fourth pseudo random sequence is based on at least a second antenna configuration identification, and wherein the second antenna configuration identification is different than the antenna configuration identification upon which the third pseudo random sequence is based.
15 . The base station of claim 11 wherein a bandwidth of the OFDM signal is fixed for a plurality of frames and is less than a bandwidth of the cell associated with the base station.
16 . The base station of claim 11 wherein the OFDM signal is sent to the client station for synchronization with the base station and acquisition of system information.
17 . The base station of claim 16 wherein the system information is included in a physical broadcast channel.
18 . The base station of claim 11 wherein the primary signal spans an OFDM symbol and the secondary signal spans an OFDM signal.
19 . The base station of claim 11 wherein the first pseudo random sequence conveys, at least in part, the identity of the cell associated with the base station.
20 . The base station of claim 11 wherein at least one of the first, second, or third pseudo random sequence is an M-sequence.