Mobility in a distributed antenna system

• US 9,462,610 B2
• Filed: 07/16/2014
• Issued: 10/04/2016
• Est. Priority Date: 12/12/2008
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Sexton, Thomas Aloysuis, Cliff, Charles Arthur, Pecen, Mark, Lusina, Paul James
• Primary Examiner(s): Wong, Warner
• Application Number:
  US14/332,702
• Publication Number:
  US 20140328278A1
• Time in Patent Office: 811 Days
• Field of Search: 370/252, 370/329, 370/334
• US Class Current: 1/1
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
• CPC Class Codes: H04H 20/38 Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 25/0242 using matrix methods
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A device, method or system implements operations to receive compressed samples of wireless transmissions from a plurality of user equipment (UEs) traveling through different communication regions in a wireless network, and detect information in the wireless transmissions of the UEs based on the compressed samples.

Claims

1. A method comprising:

traveling from a first pilot zone to a second pilot zone in a wireless network having a plurality of pilot zones, each pilot zone having an assigned set of pilot signals;

receiving a broadcast message containing information identifying a current pilot zone;

selecting a pilot signal from the set of pilot signals for use in the second pilot zone based on at least one scheduled assignment, wherein the at least one scheduled assignment is based on an identifier (ID) of a user equipment (UE); and

implementing a wireless transmission, including a pilot signal, based on an S-sparse set of vectors.

2. The method of claim 1, further comprising detecting transition between the first pilot zone to the second pilot zone based on a received overhead message.

3. The method of claim 2, wherein the at least one scheduled assignment is further based on a system clock.

4. The method of claim 3, wherein the traveling from a first pilot zone to a second pilot zone occurs at a speed such that a word period is less than approximately 1/10^th of a coherence interval being at least, 10*T_word≈

T_coh.

5. The method of claim 4, wherein at least two pilot zones are assigned the same set of pilot signals.

6. The method of claim 5, wherein the set of pilot signals includes a plurality of orthogonal waveforms.

7. The method of claim 5, wherein the set of pilot signals includes a plurality of pseudo random waveforms.

8. The method of claim 7, wherein the plurality of pseudo random waveforms are based on a matrix of elements, each element of the matrix being a draw on a complex Gaussian distribution with zero mean and unit variance.

9. The method of claim 5, wherein the set of pilot signals are selected based on a hash of the UE.