Random access channel response handling with aggregated component carriers
View Patent ↗Disclosed herein are methods, computer program instructions and apparatus for performing random access procedures in a wireless communication system. A method includes receiving at a network access node, in different time and frequency resources that are allocated for preamble transmission, and in different ones of a plurality of component carriers, a plurality of random access requests from individual ones of a plurality of user equipments; and transmitting a corresponding plurality of random access responses in a time and frequency resource of a single component carrier.
1. A method, comprising:
receiving at a network access node, in a time and frequency resource associated with a first frequency band, a random access request from a user equipment; and
transmitting a random access response to the random access request that is aggregated with other random access responses in a time and frequency resource associated with a second different frequency band,
wherein the aggregated random access responses are for a first type of user equipment and for a second type of user equipment, and there is at least one random access response for one of the second type of user equipment that is placed in a message at a location that need not be read by the first type of user equipment, and the message comprises an indicator that is set for indicating that the message contains the at least one random access response for one of the second type of user equipment.
2. The method of claim 1 , where the transmitting comprises transmitting a second aggregated random access response for a corresponding second user equipment in response to random access requests received in different time and frequency resources associated with the first frequency band, the second frequency band, or another frequency band.
3. A method, comprising:
transmitting to a network access node, in a time and frequency resource allocated for preamble transmission, of one of a plurality of component carriers, a random access request; and
receiving a random access response that is aggregated with other random access responses in a time and frequency resource of a different component carrier,
wherein the aggregated random access responses are for a first type of user equipment and for a second type of user equipment, where there is at least one random access response for one of the second type of user equipment that is placed in a message at a location that need not be read by the first type of user equipment, and where the message comprises an indicator that is set for indicating that the message contains the at least one random access response for one of the second type of user equipment.
4. The method of claim 3 , where the random access response is received on a physical downlink shared channel.
5. The method as in claim 3 , where the random access response is received in a component carrier that is selected freely by the network access node from the plurality of component carriers, or where the random access response is received in a component carrier selected by the network access node in accordance with at least one rule, or where the random access response is received in a component carrier specified by the use of explicit signaling.
6. The method of claim 5 , where the at least one rule comprises selecting the component carrier as being one having a first available downlink slot and, for a case where more than one of the component carriers each simultaneously contain an available downlink slot, selecting as the component carrier a component carrier having a highest frequency subcarrier.
7. The method as in claim 5 , where the explicit signaling comprises reception of system information transmitted from the network access node.
8. The method as in claim 3 , where the location that need not be read by the first type of user equipment is in a message padding portion, and where the indicator is placed in the message padding portion or is placed in a bit or bits considered as reserved by the first type of user equipment.
9. The method as in claim 3 performed as a result of execution of computer program instructions stored in a computer readable medium that comprises a part of a user equipment.
10. The method as in claim 3 performed as a result of operation of a controller that comprises a part of a user equipment.
11. An apparatus, comprising:
a controller configured to operate with a wireless receiver and a wireless transmitter, where the controller is further configured to transmit to a network access node in a time and frequency resource allocated for preamble transmission, of one of a plurality of component carriers, a random access request, and to receive a random access response that is aggregated with other random access responses in a time and frequency resource of a different component carrier,
wherein the aggregated random access responses are for a first type of user equipment and for a second type of user equipment, where there is at least one random access response for one of the second type of user equipment that is placed in a message at a location that need not be read by the first type of user equipment, and where the message comprises an indicator that is set for indicating that the message contains the at least one random access response for one of the second type of user equipment.