Communications methods and infrastructure equipment for providing an indication of data transmission without a radio connection
摘要
說明書
The random access response 412 may indicate one or more preamble identities, each associated with a respective random access request to which the random access response 412 is a response. If the communications device 104 determines that one or more such preambles corresponds to the random access preamble 408 transmitted in the random access request 406, then it determines that the random access response 412 may comprise a response to the random access request 406. (Similarly to the determination based on the RA-RNTI, it cannot conclusively determine that the random access response 412 comprises a response to the random access request 406, because another communications device may have transmitted a random access request using the same preamble).
Conventionally, the random access response 412 indicates uplink communications resources for the transmission by the communications device 104 of a radio resource control (RRC) connection request 420. The RRC connection request 420 comprises an indication of an identity of the communications device 104 which is either unique within (at least) the cell, or has a very low probability of being identical to the identity used by a different communications device within the cell. The RRC connection request 420 may be referred to as a ‘Message 3’.
In response to receiving the RRC connection request 420, the infrastructure equipment 101 transmits an RRC connection setup message 430, comprising the identity of the communications device 104 as received in the RRC connection request 420. The RRC connection setup message 430 may be referred to as a ‘Message 4’.
