Bearer mobility and splitting in a radio access network-based, 3rd generation partnership project network having an integrated wireless local area network
A wireless local area network (WLAN) point-to-point communications link between an evolved universal terrestrial radio access network node B (eNB) and a user equipment device (or simply UE) is identified by UE/eNB media access control (MAC) identifiers on a per UE or per data radio bearer (DRB) basis for offloading cellular data from a long term evolution (LTE) link to the WLAN point-to-point communications link. A wireless local area network tunneling protocol (WLTP) includes packet formats and network protocol stack arrangements to support functions facilitated by the WLAN point-to-point communications link, such as, for example, identification of control and data traffic messages, DRB identification for WLTP packets, quality of service (QoS) delay and packet loss measurement, support of bearer splitting, and support of a general framework for offloading cellular traffic at different depths of the 3rd Generation Partnership Project (3GPP) network protocol stack.
1. An apparatus for a user equipment (UE) configured to receive a wireless local area network (WLAN) packet formed according to a network protocol stack and including user data offloaded from a cellular base station, the apparatus comprising:
a memory configured to store a data radio bearer identifier (DRBID) of a data radio bearer associated with an upper layer of the network protocol stack to which the user data should be delivered based on the DRBID; and
baseband processing circuitry configured to:
process a first data unit of the WLAN packet to identify the data radio bearer, the first data unit associated with a lower layer of the network protocol stack and including a header and a data field, the header having the DRBID, and the data field having a second data unit including the user data;
generate the second data unit without the DRBID and the header from the first data unit; and
deliver for the data radio bearer the second data unit including the user data.
2. The apparatus of claim 1 , in which the lower layer corresponds to a WLAN physical layer.
3. The apparatus of claim 1 , in which the lower layer corresponds to a WLAN data link layer.
4. The apparatus of claim 1 , in which the upper layer corresponds to a packet data convergence protocol (PDCP) layer.
5. The apparatus of claim 1 , in which the header includes one or more bits that are reserved bits.
6. The apparatus of claim 1 , in which the data field is of variable size.
7. The apparatus of claim 1 , in which the baseband processing circuitry is further configured to process a Radio Resource Control (RRC) message to configure user-data offloading.
8. The apparatus of claim 1 , in which the WLAN packet includes an EtherType for forwarding the user data to the UE over a WLAN.
9. The apparatus of claim 1 , in which the data radio bearer is a split bearer.
10. An apparatus for a user equipment (UE) for a wireless communication system, the apparatus comprising:
a memory configured to store a first data unit that includes a data radio bearer identifier (DRBID) and user data; and
a processor configured to:
process, from a wireless local area network (WLAN) layer, the first data unit to identify a data radio bearer associated with a packet data convergence protocol (PDCP) layer to which the user data should be delivered based on the DRBID;
generate a second data unit including the user data by removal of the DRBID and associated header information from the first data unit; and
deliver the second data unit for the data radio bearer associated with the PDCP layer.
11. The apparatus of claim 10 , in which the WLAN layer is a physical or data link layer.
12. The apparatus of claim 10 , in which the processor is further configured to process a Radio Resource Control (RRC) message to configure user-data offloading.
13. The apparatus of claim 10 , in which the data radio bearer is a split bearer.
14. The apparatus of claim 13 , in which the processor is further configured to reorder packets of the split bearer.
15. A computer-readable storage medium having stored thereon instructions that, when executed by one or more processors of a cellular base station, cause the one or more processors to perform operations comprising:
process a first packet from a packet data convergence protocol (PDCP) layer;
generate a second packet that includes the first packet and a data radio bearer identifier (DRBID) identifying a data radio bearer to which the first packet is associated with; and
provide the second packet to a lower layer for transmission to a user equipment (UE) over a wireless local area network (WLAN) connection between the UE and the cellular base station.
16. The computer-readable storage medium of claim 15 having stored thereon further instructions that, when executed by the one or more processors, further cause the one or more processors to perform operations comprising include an EtherType for the second packet indicating the second packet includes user data associated with the data radio bearer.
17. The computer-readable storage medium of claim 15 having stored thereon further instructions that, when executed by the one or more processors, further cause the one or more processors to perform operations comprising generate a Radio Resource Control (RRC) message to configure user-data offloading over the WLAN connection.
18. The computer-readable storage medium of claim 15 having stored thereon further instructions that, when executed by the one or more processors, further cause the one or more processors to perform operations comprising split the data radio bearer so as to send packets over the WLAN connection.
19. The computer-readable storage medium of claim 15 , in which the lower layer is a WLAN physical layer.
20. The computer-readable storage medium of claim 15 , in which the lower layer is a WLAN data link layer.