Use of basis functions for transmission of broadcast control information in a wireless network

Patent metadata

Field	Value
Publication number	US-9967124-B2
Application number	US-201514716333-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	Mar 26, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An example technique may include: receiving, by a mobile station from a base station, a plurality of copies of a broadcast information including a broadcast control message, wherein a copy of the broadcast information is transmitted via each of a plurality of basis function beams; determining, by the mobile station, a gain and phase value for each copy of at least a subset of the plurality of the received copies of the broadcast control message transmitted via different basis function beams. The technique may also include, for example, determining, by the mobile station, a combined broadcast control message based on at least the subset of the plurality of the received copies of the broadcast control message and the gain and phase value for each copy of at least the subset of the plurality of the received copies of the broadcast control message.

First claim

What is claimed is:

1. A method comprising:
transmitting, by a base station, multiple copies of a broadcast information including a broadcast control message, wherein a copy of the broadcast information is transmitted via each of a plurality of basis function beams.

2. The method of claim 1 and further comprising:
receiving, by the base station from a mobile station in response to the transmitting, feedback signals indicating a gain and phase value for each of a plurality of dominant basis function beams of the plurality of basis function beams; and
determining, based on the feedback signals, a set of beamforming weights optimized for the mobile station.

3. The method of claim 1 wherein the transmitting comprises:
transmitting by a base station a broadcast information including a set of sounding signals and a broadcast control message via each of a plurality of orthogonal basis function beams.

4. The method of claim 2 , wherein the base station includes two or more sets of antennas, wherein the transmitting comprises:
transmitting, by the base station, a broadcast information that is space-time coded across the two or more sets of antennas.

5. The method of claim 2 and further comprising:
transmitting, by the base station to the mobile station, beamformed data based on the set of beamforming weights.

6. The method of claim 2 wherein the receiving comprises:
receiving, by the base station from a first mobile station in response to the transmitting, feedback signals specific to the first mobile station that include a gain and phase value for each of a plurality of dominant basis function beams that are dominant for the first mobile station; and
receiving, by the base station from a second mobile station in response to the transmitting, feedback signals specific to the second mobile station that include a gain and phase value for each of a plurality of dominant basis function beams that are dominant for the second mobile station.

7. The method of claim 6 and further comprising:
determining, based on the feedback signals specific to the first mobile station, a first set of beamforming weights optimized for the first mobile station; and
determining, based on the feedback signals specific to the second mobile station, a second set of beamforming weights optimized for the second mobile station.

8. The method of claim 1 wherein the transmitting comprises:
transmitting a broadcast information that includes a set of sounding signals and a broadcast control message via a set of orthogonal basis function beams, the base station applying an individual gain and phase weighting to each of Q antennas to transmit a copy of the broadcast information via each beam of the set of orthogonal basis function beams.

9. The method of claim 1 wherein the plurality of basis function beams are derived from a discrete Fourier transform (DFT) matrix.

10. An apparatus comprising at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to:
transmit, by a base station, multiple copies of a broadcast information including a broadcast control message, wherein a copy of the broadcast information is transmitted via each of a plurality of basis function beams.

11. The apparatus of claim 10 wherein the apparatus is further caused to:
receive, by the base station from a mobile station in response to the transmitting, feedback signals indicating a gain and phase value for each of a plurality of dominant basis function beams of the plurality of basis function beams; and
determine, based on the feedback signals, a set of beamforming weights optimized for the mobile station.

12. The apparatus of claim 10 wherein causing the apparatus to transmit comprises causing the apparatus to:
transmit by a base station a broadcast information including a set of sounding signals and a broadcast control message via each of a plurality of orthogonal basis function beams.

13. The apparatus of claim 10 wherein the base station includes two or more sets of antennas, wherein causing the apparatus to transmit comprises causing the apparatus to:
transmit, by the base station, a broadcast information that is space-time coded across the two sets of antennas.

14. The apparatus of claim 11 and further comprising causing the apparatus to:
transmit, by the base station to the mobile station, beamformed data based on the set of beamforming weights.

15. The apparatus of claim 11 wherein causing the apparatus to receive comprises causing the apparatus to:
receive, by the base station from a first mobile station in response to the transmitting, feedback signals specific to the first mobile station that include a gain and phase value for each of a plurality of dominant basis function beams that are dominant for the first mobile station; and
receive, by the base station from a second mobile station in response to the transmitting, feedback signals specific to the second mobile station that include a gain and phase value for each of a plurality of dominant basis function beams that are dominant for the second mobile station.

16. The apparatus of claim 15 and further causing the apparatus to:
determine, based on the feedback signals specific to the first mobile station, a first set of beamforming weights optimized for the first mobile station; and
determine, based on the feedback signals specific to the second mobile station, a second set of beamforming weights optimized for the second mobile station.

17. A method comprising:
receiving, by a mobile station from a base station, a plurality of copies of a broadcast information including a broadcast control message, wherein a copy of the broadcast information is transmitted via each of a plurality of basis function beams;
determining, by the mobile station, a gain and phase value for each copy of at least a subset of the plurality of the received copies of the broadcast control message transmitted via different basis function beams; and
determining, by the mobile station, a combined broadcast control message based on at least the subset of the plurality of the received copies of the broadcast control message and the gain and phase value for each copy of at least the subset of the plurality of the received copies of the broadcast control message.

18. The method of claim 17 and further comprising decoding, by the mobile station, the combined broadcast control message.

19. The method of claim 17 wherein each copy of the broadcast control message is transmitted via a different basis function beam of a set of orthogonal basis function beams.

20. The method of claim 17 wherein the determining a gain and phase value for each copy of at least a subset of the plurality of the received copies of the broadcast control message comprises:
determining, based on an amplitude of at least a portion of each received copy of the broadcast information, a dominant subset of the plurality of the received copies of the broadcast control message; and
determining a gain and phase value for each copy of the dominant subset of the plurality of the received copies of the broadcast control message.

21. The method of claim 17 wherein the determining a combined broadcast control message comprises:
determining a combined broadcast control message as a sum of the subset of the plurality of the weighted received copies of the broadcast control message, where each received copy is weighted by its gain and phase value.

Assignees

• Nokia Solutions & Networks Oy

Inventors

• Thomas Timothy
• Vook Frederick
• Ratasuk Rapeepat

Classifications

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04B7/063 Primary

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title

• H04L27/2636 Primary

  with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM] · CPC title

• H04B7/0695

  using beam selection · CPC title