LTE에서 UE가 cell specific reference signal을 통해 신호 세기를 측정한다고 하는데
여기서 궁금한게 있습니다.
질문
1. cell specific reference signal이 antenna port에서 여러 RB으로 부여가 되는데 이때 cell에 대한 세기 측정을 어떤 형식으로 하는지요??
(CRS에 있는 모든 RB에 대한 세기를 더하는지, 아니면 평균 내는지, 아니면 다른 방식이있는지 궁금합니다)
2. 추가적인 질문, LTE 표준에서 핸드오버를 결정하기 위한 measurement를 몇 초 단위로 측정하는지 궁금합니다.
아래 내용이 혹시 도움이 될까 남깁니다.
3GPP 36.214 5.1.1
5.1.1 Reference Signal Received Power (RSRP)
Definition
Reference signal received power (RSRP), is defined as the linear average over the power contributions (in [W]) of the resource elements that carry cell-specific reference signals within the considered measurement frequency bandwidth.
For RSRP determination the cell-specific reference signals R0 according TS 36.211 [3] shall be used. If the UE can reliably detect that R1 is available it may use R1 in addition to R0 to determine RSRP.
The reference point for the RSRP shall be the antenna connector of the UE.
If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding RSRP of any of the individual diversity branches.
Applicable for
RRC_IDLE intra-frequency,
RRC_IDLE inter-frequency,
RRC_CONNECTED intra-frequency,
RRC_CONNECTED inter-frequency
Note1: The number of resource elements within the considered measurement frequency bandwidth and within the measurement period that are used by the UE to determine RSRP is left up to the UE implementation with the limitation that corresponding measurement accuracy requirements have to be fulfilled.
Note 2: The power per resource element is determined from the energy received during the useful part of the symbol, excluding the CP