What is the relationship between RSRP and SINR?

Question

In most of the LTE network, the rsrp difference between the two antennas of a device should not exceed 5-6dbm. what is the influence on device or network if the rsrp difference is significantly high?

Answer 1

RSRP is avverage power measured on REs for cell specific reference signals.. UE uses this measurement for selection, reselection, handovers..

Following link gives information on SINR. SINR is not defined in 3gpp spec and is vendor specific as advised in below link.
http://www.laroccasolutions.com/training/164-rsrq-to-sinr

Answer 2

RSRP (Reference Signal Receive Power) is the average power of Resource Elements (RE) that carry cell specific Reference Signals (RS) over the entire bandwidth, so RSRP is only measured in the symbols carrying RS.
* RSRP is the average received power of a single RS resource element.
* UE measures the power of multiple resource elements used to transfer the reference signal but then takes an average of them rather than summing them.
* Reporting range -44…-140 dBm
As Alkesh pointed out this is used in cell reselection

SINR (Signal to Interference & Noise Ratio) is a measure of signal quality as well but it is not defined in the 3GPP specs but defined by the UE vendor.

It is not reported to the network. SINR is used a lot by operators, and the LTE industry in general, as it better quantifies the relationship between RF conditions and Throughput. UEs typically use SINR to calculate the CQI (Channel Quality Indicator) they report to the network.

Relation between SINR and RSRQ