Procedure for formulating a signal to interference plus noise ratio

Patent metadata

Field	Value
Publication number	US-9301184-B2
Application number	US-201113985774-A
Country	US
Kind code	B2
Filing date	May 31, 2011
Priority date	Feb 16, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A method and system for formulating an SINR metric for cells using only the existing RSRP and RSRQ measurements. With this method and system side information is exchanged between eNBs of an E-UTRAN using the X2 interface where the X2 interface carries the X2 Application Protocol (X2AP). The side information is introduced either within X2AP messages exchanged between NB nodes or via modification of existing X2AP messages. Serving cell system information block (SIB) messages may also be modified or new SIB messages introduced to facilitate computation of an SNIR metric at a UE.

First claim

What is claimed is:

1. A method for formulating a signal to interference plus noise (SINR) ratio for a plurality of eNodeBs comprising:
receiving a reference symbol receive power (RSRP) value for each of the plurality of eNodeBs;
receiving a reference symbol receive quality (RSRQ) value for each of the plurality of nodes;
exchanging side information between the plurality of eNodeBs, the side information including average transmit power level of data resource elements normalized to average power level of reference signal resource elements for each of the plurality of eNodeBs, wherein the normalization is performed based on a maximum output power of the eNobeB, a resource block size, and a downlink bandwidth;
calculating a SINR ratio based upon the side information, the RSRP value and the RSRQ for each of the plurality of eNodeBs;
determining a target eNodeB based on the calculated SINR ratio for each of the plurality of eNodeBs; and
transmitting, to a mobile device, a handover message indicating the target eNodeB.

2. The method of claim 1 wherein:
the exchanging side information is via an X2 interface application protocol (X2AP).

3. The method of claim 1 wherein:
the exchanging side information via the X2 interface application protocol (X2AP) is via new X2AP messages.

4. The method of claim 1 wherein:
the exchanging side information via the X2 interface application protocol (X2AP) is via modification of existing X2AP messages.

5. An apparatus for formulating a signal to interference plus noise (SINR) ratio for a plurality of eNodeBs comprising:
a memory,
at least one hardware processor, processing instructions stored in the memory, configured to:
receive a reference symbol receive power (RSRP) value for each of the plurality of eNodeBs;
receive a reference symbol receive quality (RSRQ) value for each of the plurality of eNodeBs;
exchange side information between the plurality of eNodeBs, the side information including average transmit power level of data resource elements normalized to average power level of reference signal resource elements for each of the plurality of eNodeBs, wherein the normalization is performed based on a maximum output power of the eNobeB, a resource block size, and a downlink bandwidth;

calculate a SINR ratio based upon the side information, the RSRP value and the RSRQ for each of the plurality of eNodeBs;
determine a target eNodeB based on the calculated SINR ratio for each of the plurality nodes; and
transmit, to a mobile device, a handover message indicating the target eNodeB.

6. The apparatus of claim 5 wherein:
the exchanging side information is via an X2 interface application protocol (X2AP).

7. The apparatus of claim 5 wherein:
the exchanging side information via the X2 interface application protocol (X2AP) is via new X2AP messages.

8. The apparatus of claim 5 wherein:
the exchanging side information via the X2 interface application protocol (X2AP) is via modification of existing X2AP messages.

Assignees

• Bontu Chandra Sekhar
• Cai Zhijun
• Yu Yi
• Song Yi
• Hu Rose Qingyang
• Blackberry Ltd

Inventors

• Bontu Chandra Sekhar
• Cai Zhijun
• Yu Yi
• Song Yi
• Fong Mo-Han
• Hu Rose Qingyang

Classifications

• H04W92/20

  between access points · CPC title

• H04W36/0061

  of neighbour cell information · CPC title

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04W36/0094 Primary

  Definition of hand-off measurement parameters · CPC title