LTE SIB1时频资源
1.時(shí)域資源
參考3GPP 36.331 – 5.2.1.2Scheduling
The SystemInformationBlockType1 uses a fixed schedule with a periodicity of 80 msand repetitions made within80 ms. Thefirst transmission of SystemInformationBlockType1 is scheduled insubframe #5 of radio frames for whichthe SFN mod 8 = 0, and repetitionsare scheduled in subframe #5 of all other radio frames for whichSFN mod 2 = 0.
傳輸周期 = 80 ms
SIB 1時(shí)域長(zhǎng)度: 整個(gè)subframe 5上的data region都有可能.| SIB1傳輸 | ? The first transmission | ? repetitions |
| SFN滿足條件 | ? SFN mod 8 = 0 | ? SFN mod 2 = 0 |
| Subframe滿足條件 | ? subframe #5 | ? subframe #5 |
2.頻域資源
Sib1頻域資源的位置不固定,是由SI-RNTI加擾的PDCCH來(lái)指示。
UE需要先在子幀上使用SI-RNTI盲檢加擾的PDCCH,才能知道該子幀是否存在Sib1消息. 盲檢的過(guò)程可以參考我的博文:LTE x-RNTI (2)
眾所周知:PDCCH is a physical channel that carries DCI.那種DCI format 可以用SI-RNTI 加擾呢??
答案就是:DCI 1A/1C.
如下表格來(lái)自:sharetechnote.
| RNTI Types | DCI Format Applicable to the RNTI Type |
| SI-RNTI, P-RNTI, RA-RNTI | 1A, 1C |
| C-RNTI, SPS C-RNTI | 0, 1A, 1B, 1D, 2, 2A, 2B, 2C, 4 (2B,2C,4 is for Rel 10 or later) |
| M-RNTI | 1C |
| TPC-RNTI | 3, 3A |
總結(jié)
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