Bearer-less architecture for a wireless cellular network
An architecture, for a cellular communications system, is described herein in which a “bearer-less” model is used for both the radio interface and the network core. Instead of using an individual Layer 2 bearer for each Quality of Service (QoS) class, in the architecture described herein, a common Layer 2 connection (e.g., a Layer 2 “fat pipe”) may be used to handle traffic flows between a User Equipment (UE) device and an external Packet Data Network (PDN). Additionally, a bearer-less architecture may be used in the radio interface (i.e., between User Equipment (UE) and the eNB).
1. An apparatus comprising:
processing circuitry configured to:
generate a request to establish a connection with a packet data network (PDN);
process a resource request, associated with the PDN, to determine:
an indication of a Service Data Flow (SDF) associated with the resource request, and
Quality of Service (QoS) information for packets in the SDF; and
a transceiver configured to communicate with a Base Station (BS), via a particular radio bearer established between the UE and the BS, the communication including:
multiplexing transmission of packets corresponding to a plurality of different SDFs over the particular radio bearer, the multiplexing including scheduling the packets of the plurality of different SDFs based on the corresponding QoS information for each of the plurality of different SDFs, wherein multiplexing the transmission of packets includes multiplexing Guaranteed Bit Rate (GBR) packets and non-GBR Unacknowledged Mode Radio Link Control (UM RLC) packets on the particular radio bearer.
2. The apparatus of claim 1 , wherein the indication of the SDF includes an SDF template.
3. The apparatus of claim 1 , wherein multiplexing the transmission of packets includes multiplexing transmission of packets for different PDNs on the particular radio bearer.
4. The apparatus of claim 3 , wherein the apparatus further comprises circuitry to:
discriminate between packets associated with the different PDNs based on destination Internet Protocol (IP) addressing information of the packets.
5. The apparatus of claim 1 , wherein generating the request to establish the connection includes encoding a message, including the request, for transmission over a radio interface; and
wherein processing the resource request includes decoding the resource request.
6. A non-transitory computer-readable medium storing program instructions that, when executed by one or more processors, cause the one or more processors to:
generate a request to establish a connection with a packet data network (PDN);
receive, from a Base Station (BS) or from a control plane process associated with the cellular communication network, an indication of:
a Service Data Flow (SDF), and
Quality of Service (QoS) information for packets in the SDF; and
communicate with the BS, via a particular radio bearer established between the UE and the BS, the communication including scheduling transmission of packets, corresponding to a plurality of different SDFs over the particular radio bearer, wherein a first SDF of the plurality of different SDFs is associated with Guaranteed Bit Rate (GBR) packets and a second SDF of the plurality of different SDFs is associated with non-GBR Unacknowledged Mode Radio Link Control (UM RLC) packets, wherein the GBR and the non-GBR UM RLC packets are multiplexed over the particular radio bearer.
7. The non-transitory computer-readable medium of claim 6 , wherein the scheduling includes scheduling the packets of the plurality of different SDFs based on the corresponding QoS information for each of the plurality of different SDFs.
8. The non-transitory computer-readable medium of claim 6 , wherein the indication of the SDF includes an SDF template.
9. The non-transitory computer-readable medium of claim 6 , the communication comprising multiplexing the transmission of packets on the particular radio bearer, wherein multiplexing the transmission of packets includes multiplexing the GBR packets and the non-GBR UM RLC packets on the particular radio bearer.
10. The non-transitory computer-readable medium of claim 6 , wherein scheduling the transmission of packets includes scheduling transmission of packets for different packet data networks on the particular radio bearer.
11. The non-transitory computer-readable medium of claim 10 , wherein the program instructions further include program instructions to cause the one or more processors to:
discriminate between packets associated with the different packet data networks based on destination Internet Protocol (IP) addressing information of the packets.
12. A non-transitory computer-readable medium storing program instructions that, when executed by one or more processors, cause the one or more processors to:
process a request, received from User Equipment (UE), to establish a connection with a packet data network (PDN); and
configure user plane nodes, in the cellular communication network, to support the requested PDN connection, the configuring of the user plane nodes including establishing, for the UE, a single common Layer 2 connection between a serving Base Station (BS) and the PDN, wherein the single common Layer 2 connection between the BS and the PDN is configured to carry both Guaranteed Bit Rate (GBR) packets and non-GBR Unacknowledged Mode Radio Link Control (UM RLC) packets related to the UE, wherein the GBR and the non-GBR UM RLC packets are multiplexed over a particular radio bearer.
13. The non-transitory computer-readable medium of claim 12 , wherein the common Layer 2 connection includes a General Packet Radio Service (GPRS) Tunneling Protocol (GTP) tunnel.
14. The non-transitory computer-readable medium of claim 12 , wherein the program instructions further include program instructions to cause the one or more processors to:
configure at least one of the user plane nodes, in a path of the common Layer 2 connection, to buffer packets for the UE when the UE is in Idle mode.
15. The non-transitory computer-readable medium of claim 12 , wherein a plurality of the user plane nodes are configured to buffer packets, wherein each of the plurality of the user plane nodes that are configured buffer packets corresponds to a common Layer 2 connection for a PDN connection.
16. The non-transitory computer-readable medium of claim 12 , wherein the program instructions further include program instructions to cause the one or more processors to:
determine an amount of the user plane nodes in the path of the common Layer 2 connection.
17. The non-transitory computer-readable medium of claim 12 , wherein the user plane nodes include configurable switches.
18. The non-transitory computer-readable medium of claim 12 , wherein the program instructions further include program instructions to cause the one or more processors to:
provide Quality of Service (QoS) information to the BS or UE on a per-Service Data Flow (SDF) basis.