Evolved data compression scheme signaling
Methods, systems, and devices are described for wireless communication at a UE. In aspects, a receiver may receive a transmission requesting information about support for data compression. The receiver may determine parameters related to the types of supported data compression and communicate the information to the transmitting device. In some cases, the receiver may then receive a message from the transmitting entity that requests establishment of a data compression configuration. The receiver may respond with confirmation or rejection of the proposed compression configuration. If the configuration is confirmed, the transmitter and receiver may exchange compressed data packets according to the configuration. The devices may exchange status and control information related to the compression configuration (e.g., in a compression header of a compressed message or a separate status and/or control information message).
1. A method of communication at a wireless device, comprising:
receiving, from a first device, a compression capability request requesting an indication of a capability of the wireless device for compressing a payload of a wireless data transmission;
identifying, by the wireless device, a compression capability parameter based on the compression capability request and the capability of the wireless device, wherein the compression capability parameter is one of uplink algorithm information, downlink algorithm information, a compression rate supported by the wireless device, a compressor context memory size, or a prefill configuration for a compressor context memory;
transmitting, to the first device and in response to the compression capability request, a compression capability response that includes a header that conveys the compression capability parameter, the compression capability response indicating one or more capabilities of the wireless device and allowing the first device to select a compression configuration based at least in part on the compression capability parameter; and
receiving, from the first device, a compression configuration request based at least in part on the compression capability response, the compression configuration request indicating a compression context identity (ID) that is saved across a plurality of radio resource control (RRC) connections.
2. The method of claim 1 , further comprising:
transmitting a compression configuration confirmation or rejection based at least in part on the compression configuration request.
3. The method of claim 1 , further comprising:
transmitting and receiving a compressed packet based at least in part on the compression capability response.
4. The method of claim 3 , wherein the compressed packet comprises one or more extended compression header fields indicating at least one of:
a compression context reset request, a compression disable request associated with a number of subsequent packets, a compression context synchronization indication, a compression context freeze request, a multi-part compression indicator associated with a plurality of compression contexts, or a compression metadata indicator.
5. The method of claim 4 , further comprising:
transmitting a context identification (ID) save confirmation request; and
receiving a context ID save confirmation.
6. The method of claim 1 , further comprising:
transmitting a compression control message.
7. The method of claim 6 , wherein transmitting the compression control message comprises:
transmitting the compression control message on a high priority radio bearer.
8. The method of claim 6 , wherein the compression control message is based at least in part on a determination that an amount of available wireless device processing resources is below a threshold, or based on a determination that the wireless device has failed to decompress or decode a number of packets.
9. The method of claim 6 , wherein the compression control message comprises at least one of a compression state indication, a compression scope indication, a data compression threshold, a compression enable/disable indication, a compressed packet ratio, or a context ID reset request.
10. The method of claim 1 , further comprising:
transmitting a compression status indication.
11. The method of claim 10 , wherein the compression status indication comprises at least one of a ciphered packet data convergence protocol (PDCP) control protocol data unit (PDU) type, an unciphered PDCP control PDU type, a sequence number, or a compression enable/disable indication.
12. The method of claim 10 , wherein transmitting the compression status indication comprises:
disabling or enabling compression on a radio bearer; and
transmitting the compression status indication after a last or before a first compressed data protocol data unit (PDU) is transmitted.
13. The method of claim 1 , further comprising:
transmitting a compression enable request or a compression disable request based at least in part on at least one of a processing limitation, a traffic type, or a determination that a resource grant volume is sufficient to clear an uncompressed memory buffer during one or more periodic intervals.
14. The method of claim 1 , wherein the compression capability parameter comprises a compression rate support parameter or a compression context prefill configuration.
15. The method of claim 1 , further comprising:
disabling a PDCP discard timer based at least in part on the compression capability request.
16. The method of claim 1 , further comprising:
storing a compressed version of a packet;
storing an uncompressed version of the packet; and
resetting a context ID based on the uncompressed version of the packet.