Data transmission method and device and search space optimization method and device

A data transmission method and data technology, applied in the field of communication, can solve the problems of power consumption and long time interval.

Active Publication Date: 2019-04-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In a large class of applications, such as meter reading services, a static or low-mobility UE may only need to send one data packet at a time, and the time interval between two data packet transmissions is long. In this case, the UE en

Method used

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  • Data transmission method and device and search space optimization method and device
  • Data transmission method and device and search space optimization method and device
  • Data transmission method and device and search space optimization method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] In this embodiment, the terminal transmits uplink data after receiving Msg4 in the idle state. The first request message (Msg3) sent by the UE during the random access procedure includes an indication of whether to perform state transition and / or an indication of uplink data to be sent. After receiving the conflict resolution ID of the base station and judging that the conflict resolution is successful, the terminal maintains the RRC_IDLE state and reserves the C-RNTI for a period of time. The terminal receives the UL grant from the base station and uses the UL grant to send uplink data. When the data in the terminal buffer has been sent, the terminal can send the last uplink data packet while carrying an indication that there is no data to be sent to the base station. After confirming that the base station has received the last uplink data packet, the terminal releases the C-RNTI.

[0124] Such as Figure 4 As shown, the data transmission method provided in this embo...

Embodiment 2

[0153]In this embodiment, the terminal is in an idle state and transmits uplink data before receiving Msg4. The first request message (Msg3) sent by the terminal during the random access process includes an indication of whether to perform state transition and / or an indication of uplink data to be sent. After receiving the instruction, the base station allocates a UL grant to the terminal through the PDCCH. If the PDCCH contains a retransmission instruction, the terminal retransmits Msg3 according to the existing mechanism. If the PDCCH contains a new transmission instruction, the terminal uses the UL grant to send uplink data . When the data in the terminal buffer has been sent, the terminal may send the last uplink data packet to the base station with an indication that there is no data to be sent. After receiving the data packet and the indication that there is no data to be sent, the base station sends Msg4 to the terminal. After receiving the conflict resolution ID carri...

Embodiment 3

[0173] In this embodiment, the base station configures multiple sets of common search spaces for the terminal through a system message, and these common search spaces have monitoring intervals of different lengths, and the starting positions and repetition times of these common search spaces may be the same or different.

[0174] This embodiment provides a search space optimization method, such as Image 6 shown, including:

[0175] Step 601, the terminal receives multiple sets of common search spaces configured by the base station;

[0176] Step 602, when the preset condition is met, the terminal switches between the multiple sets of common search spaces.

[0177] In an embodiment, the monitoring intervals of the multiple sets of common search spaces are not all the same.

[0178] In an embodiment, the meeting the preset conditions includes meeting at least one of the following:

[0179] The terminal receives an instruction to support earlier data transmission sent by the ...

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Abstract

A data transmission method and device and a search space optimization method and device are provided. The data transmission method includes the following steps: a terminal sends a random access prefixto a base station and receives a random access response from the base station; the terminal sends a first request message to the base station; and the terminal receives an uplink grant sent by the base station in a first state and uses the uplink grant to send uplink data to the base station, wherein the first state is an idle state or an inactive state. In the application, the terminal can transmit uplink data without entering a connected state, so that the power consumption of the terminal is reduced.

Description

technical field [0001] The invention relates to communication technology, in particular to a data transmission method and device, and a search space optimization method and device. Background technique [0002] In an M2M (Machine to Machine, machine-to-machine) communication system between machines, energy saving of a UE (User Equipment, terminal) is crucial. In related technologies, when the UE is in an idle state (RRC_IDLE) and has data to send, the UE first triggers a random access process to establish or restore an RRC (Radio Resource Control, radio resource control) connection with the network, and the UE can send the data at the earliest The RRC connection establishment complete or RRC recovery complete message is sent to the base station together. Afterwards, the UE will remain in the connected state (RRC_CONNECTED) for a period of time, waiting for the base station to release the UE. When the UE is in the RRC_CONNECTED state and needs to send data, the UE may need ...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04W74/08
CPCH04W52/0212H04W74/0833H04W76/27H04W4/00H04W52/02H04W72/1268H04W72/23
Inventor 陆婷戴博沙秀斌
Owner ZTE CORP
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