Method and apparatus of enhanced paging
Methods and apparatus are provided for paging enhancement for the UE in the LC-MTC mode. In one novel aspect, the UE determines if the UE is in CE mode, obtains a set of narrow-band resource blocks reserved for LC-MTC paging messages and decodes a paging message based on the obtained narrow-band resource blocks. In one embodiment, the paging message occupies a predefined narrow band resource blocks without control information. In another embodiment, MPDCCH is used as control message to schedule narrow-band paging messages. In one embodiment, the MPDCCH searching space comprises a paging narrow-band selected from the set of narrow bands based on a UE ID. In another novel aspect, methods for PO detection are provided. The UE obtains a set of common paging narrow-bands from a higher layer configuration, determines a paging occasion to monitor paging message, decodes paging messages within the obtained common paging narrow-band, and performs combination.
1. A method in a communication system comprising:
determining whether a user equipment (UE) is in a low cost (LC) machine type communication (MTC) mode, wherein the UE is in LC MTC mode upon detecting one or more conditions comprising: the UE is an LC MTC device, and the UE is a normal UE in a coverage extension (CE) mode;
obtaining a set of narrow-band resource blocks reserved for paging messages; and
decoding a paging message based on at least one of the obtained set of narrow-band resource blocks and downlink control information, wherein the downlink control information is based on the obtained set of narrow-band resource blocks.
2. The method of claim 1 , wherein the set of narrow-bands are obtained from a higher layer message.
3. The method of claim 2 , further comprising:
obtaining an MTC physical down link control channel (MPDCCH) search space based on the set of narrow-bands; and
decoding the paging message after obtaining scheduling information within the MPCCH searching space.
4. The method of claim 3 , wherein the MPDCCH searching space comprises a paging narrow-band, and the paging narrow-band is selected from the set of narrow bands based on a UE ID.
5. The method of claim 4 , wherein the UE ID is a function of IMSI, S-TMSI, UE specific P-RNTI or multicast P-RNTI shared by a group of UEs.
6. The method of claim 5 , wherein the group of UEs share the same coverage extension (CE) level.
7. The method of claim 1 , wherein the higher layer message comprises one or more narrow-band resource blocks index for the paging message.
8. The method of claim 1 , wherein before decoding a second paging message, further checking if frequency hopping is enabled by the UE.
9. The method of claim 8 , wherein when the frequency hopping is enabled, obtaining another narrow-band under a hopping pattern.
10. A method in a mobile communication system comprising:
obtaining, by a user equipment (UE), a set of common paging narrow-bands from a higher layer configuration;
determining a paging occasion to monitor one or more paging messages, wherein the paging occasion is a starting point for paging messages indicated in a higher layer message; and
decoding the one or more paging messages within an obtained common paging narrow-band and performing combination of decoded subframes of the one or more paging messages.
11. The method of claim 10 , further comprising: determining whether a frequency hopping is enabled.
12. The method of claim 10 , further comprising checking whether a number of virtual paging occasion (PO) is indicated in downlink control information (DCI).
13. The method of claim 12 , wherein if the number of virtual POs is indicated, obtaining the narrow-bands for the number of the virtual POs, and decoding a second paging message at one of the number of the virtual POs.
14. A user equipment (UE), comprising:
a transceiver that transmits and receives radio signals in a wireless network;
a memory; and
a processor coupled to the memory, the processor configured to detect whether the UE is in a low cost (LCU) machine type communication (MTC) mode, wherein the UE is in LC MTC mode upon detecting one or more conditions comprising: the UE is an LC MTC device, and the UE is a normal UE in a coverage extension (CE) mode;
obtain a set of narrow-band resource blocks reserved for LC-MTC paging messages; and
decode a paging message based on at least one of the reserved set of narrow-band resource blocks and downlink control information, wherein the down link control information is based on the reserved set of narrow-band resource blocks.
15. The UE of claim 14 , wherein the set of narrow-bands are obtained from a higher layer message, wherein the higher layer comprises a narrow-band index.
16. The UE of claim 15 , wherein the higher layer message, comprises the narrow-band index.
17. The UE of claim 14 , wherein the processor is further configured to obtain an MTC physical down link control channel (MPDCCH) search space based on the set of narrow-bands and decode the paging message after obtaining scheduling information within the MPCCH searching space.
18. The UE of claim 17 , wherein the MPDCCH searching space comprises a paging narrow-band, and the paging narrow-band is selected from the set of narrow bands based on a UE ID.
19. The UE of claim 14 , wherein the processor is further configured to determine a paging occasion (PO) to monitor paging message and checks whether a number of virtual PO is indicated in the down link information.