A method and apparatus for performing a random access procedure in a wireless communication system is provided. A user equipment (UE) determines whether transmission of a first random access (RA) preamble to a first node and transmission of a second RA preamble to a second node overlap each other at a specific time duration. If it is determined that the transmission of the first RA preamble and the transmission of the second RA preamble overlap each other, the UE determines whether both the transmission of the first RA preamble and the transmission of the second RA preamble are available at the specific time duration based on an uplink power. If not available, the UE transmits the first RA preamble only at the specific time duration.

Technology for a user equipment (UE) operable to perform mission critical communications with an eNodeB is disclosed. The UE can transmit a physical random access channel (PRACH) signal to the eNodeB that indicates a mission critical communication to be performed between the UE and the eNodeB. The PRACH signal can be transmitted in accordance with a first transmission time interval (TTI). The UE can receive a random access response (RAR) message from the eNodeB that includes a timing advance (TA) and a resource allocation for the mission critical communication. The RAR message can be transmitted from the eNodeB using a second TTI. The UE can perform the mission critical communication with the eNodeB in an uplink using the TA and the resource allocation indicated in the RAR message. The mission critical communication can be performed using a physical uplink shared channel (PUSCH) and in accordance with the second TTI.

The present invention relates to a method for supporting random access (RA) of a wireless device. The method is performed in a radio network node of a wireless communication system. The radio network node serves a cell. The method comprises determining (610) whether to allocate a dedicated RA preamble to the wireless device at paging of the wireless device in the cell. When it is determined to allocate the dedicated RA preamble to the wireless device at paging, the method further comprises transmitting (620) an indicator of the dedicated RA preamble to the wireless device in a message related to the paging of the wireless device. The dedicated RA preamble is valid for RA during a time window. Corresponding methods in the wireless device and in a core network node are also provided, as well as the nodes themselves.

There is provided a heterogeneous communications network. The heterogeneous communications network comprises: a macro cell; a small cell provided within the macro cell; and a user equipment provided within the macro cell, wherein the user equipment is operable to receive control-plane information from the macro cell and user-plane information from the macro cell and/or the small cell, and wherein the user equipment is operable to transmit a connection request based on the received control-plane information, the macro cell and/or small cell are operable to determine which of the macro cell and the small cell is to operate as the serving cell for the user equipment based on the connection request, and the determined serving cell is operable to transmit a connection response to the user equipment.

The present disclosure relates to a downlink data transmission/reception technique for supporting a low-complexity UE category/type for a MTC operation. A method may be provided for an MTC UE to receive a random access response. The method may include: repeatedly transmitting a random access preamble to a base station through a Physical Random Access Channel (PRACH) of at least one subframe; determining a Random Access Radio Network Temporary Identifier (RA-RNTI) using first time index information, frequency index information, and second time index information on the PRACH; and receiving a random access response to the random access preamble using the RA-RNTI within a random access response window.

The present invention discloses a method, an apparatus and a system for processing very-high-speed random access. The method includes: selecting a ZC sequence group according to a cell type and a first cyclic shift parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, where N?5; sending the cell type, a second Ncs, and the ZC sequence group to a UE; receiving a random access signal sent by the UE, and obtaining the random access sequence from the random access signal; performing correlation processing on the random access sequence with each ZC sequence in the ZC sequence group, detecting a valid peak value in the N detection windows of each ZC sequence, and determining an estimated value of an RTD according to the valid peak value, so that a UE in a very-high-speed scenario can normally access a network, thereby improving network access performance.

A sub-band scheduling method, including: sending, to a base station on a source sub-band, a first message that carries information about a data attribute requirement of to-be-transmitted data, where the information about the data attribute requirement includes at least one of the following: a transmission delay, a transmission delay type, a data bandwidth requirement, or a packet loss sensitivity; receiving, on the source sub-band, a second message that carries sub-band information of a target sub-band, where the target sub-band is a sub-band that is scheduled by the base station and that meets the data attribute requirement of the to-be-transmitted data, and the sub-band information includes at least one of the following: a sub-band number, a sub-band frequency channel number, a timing advance, an uplink resource allocated by the base station, a sub-band sending power level, or a bandwidth; and transmitting data on the target sub-band according to the sub-band information.

One embodiment of the present disclosure relates to a method for random access in a UE in an out-of-sync status. The method comprises: sending to a base station a first message including a random access preamble according to a TDD configuration in a SIB; receiving from the base station a second message including a random access response using the random access preamble according to the TDD configuration in the SIB. Another embodiment of the present invention also relates to corresponding method for random access in a base station. According to an aspect of the present disclosure, there are provided corresponding devices.

Disclosed is a method for utilizing physical random access channel (PRACH) more efficiently. The method for transmitting a D2D signal according to one embodiment allows a corresponding terminal to transceive a D2D signal, for a PRACH transmission, by means of a non-configured wireless resource from among the PRACH resources.

A first base station receives, from a second base station, cell information of a second cell of the second base station, wherein the cell information indicates a subcarrier spacing associated with the second cell. The first base station transmits, to a wireless device and after receiving the cell information of the second cell, configuration parameters for a random access channel of a first cell of the first base station.