User equipment, base station, and related methods
View Patent ↗The present disclosure provides a resource mapping and transmission method and a corresponding base station and user equipment. The method comprises: generating radio frames for NB-IoT TDD, and in the radio frames for NB-IoT TDD, mapping a Narrowband Primary Synchronization Signal “NPSS,” a Narrowband Secondary Synchronization Signal “NSSS,” a Narrowband Physical Broadcast Channel “NPBCH,” and a Narrowband System Information Block Type 1 “SIB1-NB” to subframes selected from subframes 0, 4, 5, and 9 of the radio frames, wherein the NPSS, the NSSS, the NPBCH, and the SIB1-NB are respectively mapped into different subframes and are not respectively mapped into the subframes 5, 9, 0, and 4; and transmitting the generated radio frames. According to embodiments of the present invention, user equipment supporting NB-IoT TDD can exit a search for an NB-IoT TDD cell as early as possible.
1. A method performed by a user equipment comprising, in Time Division Duplex (TDD):
receiving a block of complex-valued symbols for narrowband physical broadcast channel (NPBCH) in subframe 9 during 64 consecutive radio frames;
receiving a narrowband primary synchronization signal (NPSS); and
receiving a narrowband secondary synchronization signal (NSSS), wherein
the NPSS is mapped to resource elements in subframe 5 in every radio frame; and
the NSSS is mapped to resource elements in subframe 0 in even radio frames, wherein
the resource mapping of the NSSS and the NPBCH in the radio frames is exchanged compared to resource mapping of a NSSS and a NPBCH in the radio frames for Frequency Division Duplex (FDD), and
in FDD, the NSSS is mapped to resource elements in subframe 9 in even radio frames, and the NPBCH is mapped to subframe 0 during 64 consecutive radio frames.
2. A method performed by a base station comprising, in Time Division Duplex (TDD):
generating radio frames;
transmitting a block of complex-valued symbols for narrowband physical broadcast channel (NPBCH) in subframe 9 during 64 consecutive radio frames;
mapping a narrowband primary synchronization signal (NPSS) to resource elements in subframe 5 in every radio frame;
mapping a narrowband secondary synchronization signal (NSSS) to resource elements in subframe 0 in even radio frames,
transmitting the NPSS; and
transmitting the NSSS, wherein
the resource mapping of the NSSS and the NPBCH in the radio frames is exchanged compared to resource mapping of a NSSS and a NPBCH in the radio frames for Frequency Division Duplex (FDD), and
in FDD, the NSSS is mapped to resource elements in subframe 9 in even radio.
3. A user equipment (UE) comprising, in Time Division Duplex (TDD):
receiver configured to
receive a block of complex-valued symbols for narrowband physical broadcast channel (NPBCH) in subframe 9 during 64 consecutive radio frames;
receive a narrowband primary synchronization signal (NPSS); and
receive a narrowband secondary synchronization signal (NSSS), wherein
the NPSS is mapped to resource elements in subframe 5 in every radio frame; and
the NSSS is mapped to resource elements in subframe 0 in even radio frames, wherein
the resource mapping of the NSSS and the NPBCH in the radio frames is exchanged compared to resource mapping of a NSSS and a NPBCH in the radio frames for Frequency Division Duplex (FDD), and
in FDD, the NSSS is mapped to resource elements in subframe 9 in even radio frames, and the NPBCH is mapped to subframe 0 during 64 consecutive radio frames.
4. A base station comprising, in Time Division Duplex (TDD):
processor configured to generate radio frames; and
transmitter configured to
transmit a block of complex-valued symbols for narrowband physical broadcast channel (NPBCH) in subframe 9 during 64 consecutive radio frames;
map a narrowband primary synchronization signal (NPSS) to resource elements in subframe 5 in every radio frame; and;
map a narrowband secondary synchronization signal (NSSS) to resource elements in subframe 0 in even radio frames,
transmit the NPSS; and
transmit the NSSS, wherein
the resource mapping of the NSSS and the NPBCH in the radio frames is exchanged compared to resource mapping of a NSSS and a NPBCH in the radio frames for Frequency Division Duplex (FDD), and
in FDD, the NSSS is mapped to resource elements in subframe 9 in even radio frames, and the NPBCH is mapped to subframe 0 during 64 consecutive radio frames.