1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 option optimize_for = LITE_RUNTIME;
11 // CachedNetworkParameters contains data that can be used to choose appropriate
12 // connection parameters (initial RTT, initial CWND, etc.) in new connections.
14 message CachedNetworkParameters {
15 // Describes the state of the connection during which the supplied network
16 // parameters were calculated.
17 enum PreviousConnectionState {
19 CONGESTION_AVOIDANCE = 1;
22 // serving_region is used to decide whether or not the bandwidth estimate and
23 // min RTT are reasonable and if they should be used.
24 // For example a group of geographically close servers may share the same
25 // serving_region string if they are expected to have similar network
27 optional string serving_region = 1;
28 // The server can supply a bandwidth estimate (in bytes/s) which it may re-use
29 // on receipt of a source-address token with this field set.
30 optional int32 bandwidth_estimate_bytes_per_second = 2;
31 // The maximum bandwidth seen to the client, not necessarily the latest.
32 optional int32 max_bandwidth_estimate_bytes_per_second = 5;
33 // Timestamp (seconds since UNIX epoch) that indicates when the max bandwidth
34 // was seen by the server.
35 optional int64 max_bandwidth_timestamp_seconds = 6;
36 // The min RTT seen on a previous connection can be used by the server to
37 // inform initial connection parameters for new connections.
38 optional int32 min_rtt_ms = 3;
39 // Encodes the PreviousConnectionState enum.
40 optional int32 previous_connection_state = 4;
41 // UNIX timestamp when this bandwidth estimate was created.
42 optional int64 timestamp = 7;