Standardized inter-base station reporting of pilot contamination for improved pilot resource re-use

Patent metadata

Field	Value
Publication number	US-2016373985-A1
Application number	US-201514796598-A
Country	US
Kind code	A1
Filing date	Jul 10, 2015
Priority date	Jun 18, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

The invention is directed to systems, methods and computer program products for standardized inter-base station reporting of pilot contamination for improved pilot resource re-use. Specifically, possible pilot channel contamination is detected at first user equipment and, in response to the detection, a request is transmitted for the first user equipment to forego transmission during a next frame designated for transmitting a pilot signal. A determination is made within the next frame if other second user equipment, which are communicating with a neighboring base station, are transmitting on a same channel as a pilot channel of the first user equipment and, in response to such a determination, a report is sent to the neighboring base stations that indicates that the pilot channel on which the first user equipment is communicating is currently contaminated.

First claim

What is claimed is:

1 . A system for improving performance in a MaMi (Massive Multiple Input Multiple Output (MIMO)) communication network, the system comprising
a first Base Station (BS 1 ) in network communication with a first User Equipment (UE 1 ), wherein at least one of the BS 1 and the UE 1 are configured to detect possible pilot channel contamination of the UE 1 and, in response to detecting the possible pilot channel contamination, the BS 1 is configured to transmit to the UE 1 a request to forego transmission during a next frame designated for transmitting a pilot signal; and a plurality of second Base Stations (BS 2 ) that neighbor the BS 1 and are in network communication with one or more second User Equipment (UE 2 ), wherein, BS 1 is further configured to (i) determine within the next frame if one or more of the UE 2 s are transmitting on a same channel as a pilot channel of the UE 1 , and (ii) in response to determining that one or more of the UE 2 s are transmitting on the same channel, report to the BS 2 s that the pilot channel on which the UE 1 is communicating is currently contaminated.

2 . The system of claim 1 , wherein the BS 2 s are configured to, in response to reporting to the BS 2 s that the pilot channel is currently contaminated, determine that one or more of the UE 2 s are currently communicating with the BS 2 on the same channel as the pilot channel, and allocate a different channel resource to the one or more UE 2 s.

3 . The system of claim 1 , wherein the BS 1 is further configured to, in lieu of reporting to the BS 2 s that the pilot channel is currently contaminated, allocate a different pilot channel resource to the UE 1 .

4 . The system of claim 1 , wherein the BS 2 s are further configured, in response to reporting to the BS 2 s that the pilot channel is currently contaminated, determine which one of the base stations (BS 1 and BS 2 s ) has priority over the pilot channel and allocate different channel resources at all other BSs than the base station having priority over the pilot channel.

5 . The system of claim 1 , wherein the BS 1 is further configured to (i) determine that the BS 1 has priority over the pilot channel and (ii) in response to determining that the BS 1 has priority over the pilot channel, report to the BS 2 s that the pilot channel on which the UE 1 is communicating is currently contaminated.

6 . The system of claim 5 , wherein the BS 1 is further configured to determine that the BS 1 has no available priority channels for allocating to the UE 1 and (ii) in response to determining that the BS 1 has no available priority channels for allocating to the UE 1 , report to the BS 2 s that the pilot channel on which the UE 1 is communicating is currently contaminated.

7 . The system of claim 1 wherein the UE 1 or the BS 1 is further configured to detect the possible pilot channel contamination of the UE 1 by detecting an increase in one of uplink (UL) or downlink (DL) bit error rate (BER).

8 . The system of claim 7 , wherein the UE 1 is further configured to detect the increase in downlink BER and transmit notification of the increase in BER to the BS 1 .

9 . The system of claim 1 , wherein the BS 1 is further configured to, in response to determining that no UE 2 s are transmitting on the same channel, increase a power level to the UE 1 .

10 . A method for improving performance in a MaMi (Massive Multiple Input Multiple Output (MIMO)) communication network, the method comprising:
detecting, at one of a first User Equipment (UE 1 ) or a first Base Station (BS 1 ) within the communication network, possible pilot channel contamination of UE 1 ; in response to detecting the possible pilot channel contamination, transmitting, from the BS 1 to the UE 1 , a request for the UE 1 to forego transmission during a next frame designated for transmitting a pilot signal; determining, at the BS 1 within the next frame, if one or more second user equipment (UE 2 ) that are communicating with a neighboring second base station (BS 2 ) are transmitting on a same channel as a pilot channel of the UE 1 ; and in response to determining that the one or more UE 2 s are transmitting on the same channel, reporting, by the BS 1 , to the one or more BS 2 s that the pilot channel on which the UE 1 is communicating is currently contaminated.

11 . The method of claim 10 , further comprising in response to reporting to the BS 2 s that the pilot channel is currently contaminated, determining, at a BS 2 , that one or more UE 2 s are currently communicating with the BS 2 on the same channel as the pilot channel, and allocating, by the BS 2 , a different channel resource to the one or more UE 2 s.

12 . The method of claim 10 , further comprising in lieu of reporting to the BS 2 s that the pilot channel is currently contaminated, allocating, by the BS 1 , a different pilot channel resource to the UE 1 .

13 . The method of claim 10 , further comprising in response to reporting to the BS 2 s that the pilot channel is currently contaminated, determining which one of the base stations (BS 1 and BS 2 s ) has priority over the pilot channel and allocating different channel resources at all other BSs than the base station having priority over the pilot channel.

14 . The method of claim 10 , further comprising determining that the BS 1 has priority over the pilot channel and wherein reporting to the one or more BS 2 s occurs in response to determining that the BS 1 has priority over the pilot channel.

15 . The method of claim 14 , further comprising determining that the BS 1 has no available priority channels for allocating to the UE 1 and wherein reporting to the one or more BS 2 s occurs in response to determining that the BS 1 has no available priority channels for allocating to the UE 1 .

16 . The method of claim 10 , wherein detecting possible pilot channel contamination of the UE 1 further comprises detecting, at one of the UE 1 or the BS 1 , an increase in one of uplink (UL) or downlink (DL) bit error rate (BER).

17 . The method of claim 16 , wherein detecting the increase in BER further comprises determining that the BER meets or exceeds a predetermined bit error rate threshold.

18 . A method for improving performance in a MaMi (Massive Multiple Input Multiple Output (MIMO)) communication network, the method comprising:
in response to detecting possible pilot channel contamination of first User Equipment (UE 1 ), receiving, at the UE 1 , a request from a first base station (BS 1 ) for the UE 1 to forego transmission during a next frame designated for transmitting a pilot signal; and in response to receiving the request, foregoing, by the UE 1 , transmission of the pilot signal during the next frame, wherein the BS 1 (i) determines within the next frame that one or more second user equipment (UE 2 ), which are communicating with a neighboring second base station (BS 2 ) are transmitting on a same channel as a pilot channel of the UE 1 and (ii) in response to determining that the one or more UE 2 s are transmitting on the same channel, reports to the one or more BS 2 s that the pilot channel on which the UE 1 is communicating is currently contaminated.

19 . The method of claim 18 , further comprising in lieu of reporting to the BS 2 s that the pilot channel is currently contaminated, allocating, by the BS 1 , a different pilot channel resource to the UE 1 .

Assignees

• Sony Corp

Inventors

• Bengtsson Erik

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W36/20 Primary

  for optimising the interference level · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04L43/062

  related to network traffic · CPC title