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1. WO2020069103 - SYSTEM AND METHODS FOR ENABLING DL-EDT

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

What is claimed is:

1. An apparatus of an evolved NodeB (eNB), the apparatus comprising: processing circuitry configured to:

determine, from an Sl AP paging message from a mobility management entity (MME), that downlink (DL) early data transmission (EDT) data is initiated by the MME based on at least one of LIE capability or DL EDT data size information and is to be transmitted to a user equipment (UE);

encode, for transmission to the UE in response to a determination that the DL EDT data is to be transmitted to the UE, a radio resource control (RRC) paging message, the RRC paging message containing a DL EDT indication that indicates that the DL EDT data is to be transmitted to the UE;

decode, from the UE in response to the RRC paging message, a DL EDT random access preamble on a physical random access channel (PRACH), the DL EDT random access preamble for DL EDT;

determine whether to provide an EDT uplink (UL) grant having UL resources for transmission of a non-access stratum (NAS) service request;

encode, for transmission to the UE in response to a determination to provide the EDT UL grant, a random access response (RAR) containing the EDT UL grant;

decode, from the UE in response to the RAR, an RRC EDT Request comprising a dedicatedlnfoNAS information element (IE); and determine, from the RRC EDT Request, whether the DL EDT data is able to be transmitted to the UE, and if so, encode an RRC Early Data Complete message to release the UE, the RRC Early Data Complete message containing the DL EDT data; and

a memory configured to store the DL EDT data.

2. The apparatus of claim 1, wherein the RRC EDT Request does not contain a data container with UL EDT data.

3. The apparatus of claim 1, wherein the processing circuitry is further configured to determine whether the DL EDT data is able to be transmitted to the UE based on a coverage enhancement (CE) level of the UE and whether the DL EDT data is able to fit in a single transport block based on the CE level.

4. The apparatus of claim 3, wherein the processing circuitry is further configured to determine whether the DL EDT data is able to be transmitted to the LIE further based on a capability of the LIE to support scheduling of multiple transport blocks using a single physical downlink control channel (PDCCH).

5. The apparatus of claim 1, wherein the processing circuitry is further configured to:

encode, for transmission to the MME in response to reception of the dedicatedlnfoNAS IE, an Sl AP initial UE message indicating that the UE is ready to receive the DL EDT data; and

decode, from the MME in response to transmission of the Sl AP initial UE message, the DL EDT data.

6. The apparatus of claim 1, wherein the processing circuitry is further configured to determine whether the UE is to acknowledge receipt of the DL EDT data and if so, encode an RRC Connection Setup message to move the UE from an Idle mode to an RRC Connected mode.

7. The apparatus of claim 6, wherein the processing circuitry is further configured to encode an RRC Connection Setup message to move the UE to an Idle mode, the RRC Connection Setup message containing the DL EDT data if the UE is to transmit an acknowledgement of receipt of the DL EDT data.

8. The apparatus of claim 1, wherein the processing circuitry is further configured to:

decode, from the UE in response to the RRC Early Data Complete message or a RRC Connection Setup Complete message, an acknowledgement

of reception of the DL EDT data, the acknowledgment comprising a buffer status report (BSR);

determine whether the BSR is zero; and

in response to a determination that the BSR is zero, encode for transmission to the UE an RRCConnectionRelease message to move the UE to an idle mode.

9. The apparatus of claim 1, wherein the processing circuitry is further configured to indicate, to the UE in one of the RRC paging message or system information, an index to a pool of dedicated preambles configured for DL EDT and an index to a physical resource of the PRACH for the TIE.

10. The apparatus of claim 9, wherein a size of pool is greater than 0 and the index to the PRACH physical resource is indicated by an entry number in a legacy paging record list in the RRC paging message.

11. The apparatus of claim 1, wherein the processing circuitry is further configured to indicate, to the TIE in one of the RRC paging message or system information:

a dedicated preamble for DL EDT transmission that is dependent on a coverage enhancement (CE) level, and

a physical resource of the PRACH that shared with a Rel-l5 ETL EDT resource or a legacy PRACH resource.

12. The apparatus of claim 1, wherein the processing circuitry is further configured to:

indicate, to the LIE in one of the RRC paging message or system information, a physical resource of the PRACH for DL EDT; and

determine that the LIE has ETL EDT data to transmit through reception of the DL EDT random access preamble on a PRACH physical resource.

13. The apparatus of claim 1, wherein the processing circuitry is further configured to:

generate, for transmission to the UE in one of the RRC paging message or system information, an indication to use either a contention free preamble or a contention free physical PRACH resource that is derived from an identity of the UE; and

encode, in response to transmission of the contention free preamble or a preamble in the contention free PRACH resource, an RRC message containing the DL EDT data either moving the UE to back to an Idle mode or an RRC connected mode.

14. The apparatus of claim 13, wherein the processing circuitry is further configured to:

determine a Radio Network Temporary Identifier (RNTI) to be used to transmit the DL EDT data in response to transmission of the contention free preamble by one of use of a preconfigured RNTI or an authenticated code provided by the MME.

15. An apparatus of a user equipment (UE), the apparatus comprising:

processing circuitry configured to:

decode, from an evolved NodeB (eNB), a radio resource control (RRC) paging message that contains a downlink (DL) early data transmission (EDT) data indication indicating that DL EDT data is to be transmitted to the UE;

encode, for transmission to the eNB in response to reception of the RRC paging message, a DL EDT random access preamble on a physical random access channel (PRACH), the DL EDT random access preamble configured for DL EDT data transmission;

decode, from the eNB in response to transmission of the DL EDT random access preamble, a random access response (RAR) containing an EDT uplink (UL) grant having UL resources for transmission of a service request;

encode, for transmission to the eNB in response to reception of the RAR, an RRC EDT Request indicating that the UE has activated access stratum (AS) security; and

decode, from the eNB in response to transmission of the RRC EDT Request, an RRC message that depends on whether the UE is able to receive the DL EDT data and whether the EGE is able to avoid acknowledgment of the DL EDT data if sent, the RRC EDT Request dependent on whether the DL EDT data is able to be received based on a coverage enhancement (CE) level of the LIE, whether the DL EDT data is able to fit in a single transport block based on the CE level, and a capability of the LIE to support scheduling of multiple transport blocks using a single physical downlink control channel (PDCCH); and a memory configured to store the DL EDT data.

16. The apparatus of claim 15, wherein the processing circuitry is further configured to:

determine, from the RRC paging message, information of an index to a pool of dedicated preambles configured for DL EDT and an index to a physical resource of the PRACH.

17. The apparatus of claim 15, wherein the processing circuitry is further configured to determine, from the RRC paging message:

a dedicated preamble for DL EDT transmission that is dependent on the CE level, and

a physical resource of the PRACH that shared with a Rel-l5 ETL EDT resource or a legacy PRACH resource.

18. The apparatus of claim 15, wherein the processing circuitry is further configured to:

encode, for transmission to the eNB in response to the RRC message, an acknowledgement of the DL EDT data that indicates that a buffer status report (BSR) is zero; and

in response to transmission of the acknowledgment, decode from the eNB an RRCConnectionRelease message to move the LIE to an idle mode.

19. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of an evolved NodeB (eNB), the one or more processors to configure the eNB to, when the instructions are executed:

transmit, to a user equipment (UE), a radio resource control (RRC) paging message that contains a downlink (DL) early data transmission (EDT) data indication indicating that DL EDT data is to be transmitted to the EE; receive a DL EDT random access preamble on a physical random access channel (PRACH), the DL EDT random access preamble configured for DL EDT data transmission;

transmit, to the EE in response to reception of the DL EDT random access preamble, a random access response (RAR) containing an EDT uplink (EE) grant having EE resources for transmission of a service request;

receive, from the EE in response to the RAR, an RRC EDT Request indicating that the EE has activated access stratum (AS) security; and

transmit an RRC message to the EE that depends on whether the EE is able to receive the DL EDT data and whether the EE is able to avoid acknowledgment of the DL EDT data if sent.

20. The medium of claim 19, wherein the one or more processors further configure the eNB to, when the instructions are executed:

determine whether the DL EDT data is able to be transmitted to the EE based on a coverage enhancement (CE) level of the EE, whether the DL EDT data is able to fit in a single transport block based on the CE level, and a capability of the EE to support scheduling of multiple transport blocks using a single physical downlink control channel (PDCCH).