Base stations and methods for receiving transmissions on an enhanced random access channel
Example base stations and methods for receiving transmissions on an enhanced random access channel (RACH) are disclosed herein. An example method for receiving transmissions on an enhanced RACH from a device such that an initial access burst is received in a single time slot from the device involves receiving the initial access burst from the device on the enhanced RACH. The initial access burst is sent by the device using a timing advance determined at the device. The initial access burst includes at least one of an identifier or user data. The enhanced RACH is a contention-based uplink-only channel requiring use of timing advances for transmissions thereon.
1. A method for receiving transmissions on an uplink portion of a common control channel (CCCH) from a device to a base station in a wireless communication system, the method comprising:
configuring the device with a data size limit for transmitting on the uplink portion of the CCCH;
sending, by the base station, a notification of random access channel (RACH) resources to be used for an initial transmission by the device, wherein the RACH resources include secondary RACH resources, and wherein primary RACH resources are provided by the base station for receipt of access request messages from devices requesting assignment of a channel resource, and when a timing advance is unknown, access request messages for an assignment of a channel resource for a subsequent transmission of data are transmitted by using the primary RACH resources instead of the secondary RACH resources; and
receiving, at the base station, a first message from the device on the uplink portion of the CCCH without a data connection establishment between the device and the base station, wherein the first message includes user traffic data and an identifier.
2. The method of claim 1 , further comprising:
sending, in response to a request from an upper level layer of the device, the user traffic data included in the first message to a network destination different from the base station.
3. The method of claim 2 , wherein the first message further comprises the network destination.
4. The method of claim 3 , wherein the method further comprises: associating additional information with the user traffic data for forwarding to the network destination.
5. The method of claim 1 , wherein the identifier is a shortened identifier.
6. The method of claim 1 , further comprising:
associating the user traffic data received in the first message with a network destination address based on an identity of the device; and
forwarding the user traffic data with the network destination address and the identity of the device to the network destination.
7. The method of claim 1 , wherein the RACH resources are to be used when a data size for the initial transmission does not exceed the data size limit for transmitting on the uplink portion of the CCCH.
8. The method of claim 1 , wherein the notification includes parameters defining the RACH resources for the initial transmission.
9. The method of claim 1 , wherein the secondary RACH resources are used when the timing advance is known.
10. The method of claim 1 , wherein prior to receiving the first message, the method further comprises:
receiving a shortened identifier from the device, wherein the shortened identifier is determined by the device.
11. The method of claim 10 , wherein the identifier comprises an international mobile subscriber identity (IMSI), a temporary logical link identifier (TLLI) identifier, or a temporary mobile subscriber identity (TMSI) of the device.
12. The method of claim 1 , wherein the first message further comprises at least one of information about a requested data channel, information about capabilities of the device, or information identifying the device other than a shortened identifier.
13. A based station, comprising:
at least one hardware processor; and
a non-transitory computer-readable storage medium coupled to the at least one hardware processor and storing programming instructions for execution by the at least one hardware processor, wherein the programming instructions, when executed, cause the at least one hardware processor to perform operations comprising:
configuring a device with a data size limit for transmitting an uplink portion of a common control channel (CCCH);
sending a notification of random access channel (RACH) resources to be used for an initial transmission by the device, wherein the RACH resources include secondary RACH resources, and wherein primary RACH resources are provided by the base station for receipt of access request messages from devices requesting assignment of a channel resource, and when a timing advance is unknown, access request messages for an assignment of a channel resource fora subsequent transmission of data are transmitted by using the primary RACH resources instead of the secondary RACH resources; and
receiving a first message from the device on the uplink portion of the CCCH without a data connection establishment between the device and the base station, wherein the first message includes user traffic data and an identifier.
14. The base station of claim 13 , the operations further comprising:
sending, in response to a request from an upper level layer of the device, the user traffic data included in the first message to a network destination different from the base station.
15. The base station of claim 14 , wherein the first message further comprises the network destination.
16. The base station of claim 15 , wherein the operations further comprise: associating additional information with the user traffic data for forwarding to the network destination.
17. The base station of claim 13 , wherein the identifier is a shortened identifier.
18. A non-transitory computer-readable medium storing instructions which, when executed, cause a computing device to perform operations comprising:
configuring a device with a data size limit for transmitting an uplink portion of a common control channel (CCCH);
sending a notification of random access channel (RACH) resources to be used for an initial transmission by the device, wherein the RACH resources include secondary RACH resources, and wherein primary RACH resources are provided by the base station for receipt of access request messages from devices requesting assignment of a channel resource, and when a timing advance is unknown, access request messages for an assignment of a channel resource fora subsequent transmission of data are transmitted by using the primary RACH resources instead of the secondary RACH resources; and
receiving a first message from the device on the uplink portion of the CCCH without a data connection establishment between the device and a base station, wherein the first message includes user traffic data and an identifier.