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Random access method and device for use in wireless communication system and user terminal

A wireless communication system and random access technology, applied in the field of communication, can solve the problem of low success rate of random access and achieve the effect of improving the success rate of random access

Pending Publication Date: 2018-02-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Embodiments of the present invention provide a random access method, device, and user terminal in a wireless communication system, so as to at least solve the technical problem of low success rate of random access initiated by a mobile base station in the related art

Method used

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  • Random access method and device for use in wireless communication system and user terminal
  • Random access method and device for use in wireless communication system and user terminal
  • Random access method and device for use in wireless communication system and user terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The method embodiment provided in Embodiment 1 of the present application may be executed in a user terminal, a computer terminal, or a similar computing device. Take running on the user terminal as an example, such as figure 1 As shown, the user terminal may include one or more (only one is shown in the figure) processors 101 (processors 101 may include but not limited to processing devices such as microprocessors MCUs or programmable logic devices FPGAs) for storing Data storage 103, and transmission means 105 for communication functions. Those of ordinary skill in the art can understand that, figure 1 The shown structure is only for illustration, and it does not limit the structure of the above-mentioned electronic device.

[0046] The memory 103 can be used to store software programs and modules of application software, such as program instructions / modules corresponding to the control method of the device in the embodiment of the present invention, and the process...

Embodiment approach 1

[0068] It should be noted that the eMTC FDD system is configured with four coverage levels, namely CEL0 / CEL1 / CEL2 / CEL2, among which CEL0 has the lowest coverage level. The PRACH resource information of the four coverage levels is shown in Table 2.

[0069] Table 2

[0070]

[0071] According to the 36.211 protocol, the PRACH time domain resource (radio frame number and subframe number) corresponding to the above PRACH configuration index is shown in Table 3.

[0072] table 3

[0073] PRACH configuration index

wireless frame number

subframe number

3

Any

1

6

Any

1,6

9

Any

1,4,7

12

Any

0,2,4,6,8

[0074] Step S301, in the eMTC system, the eNodeB instructs the UE to initiate random access (for example, sending a PDCCH order), and the indicated RPACH resource information includes: initial coverage level and Subcarrier indication of NPRACH (ie, subcarrier index). In the PDCCH order issued by the eNodeB, ...

Embodiment approach 2

[0109] It should be noted that the NB-IoT system is configured with three coverage levels, namely CEL0 / CEL1 / CEL2, among which CEL0 has the lowest coverage level. The PRACH resource information of the three coverage levels is shown in Table 5.

[0110] table 5

[0111]

[0112] Step S401, in the NB-IoT system, the eNodeB issues a PDCCH order, in which the indicated PRACH information is shown in Table 5, including the fields "Starting number of NPRACH repetitions" and "Subcarrier indication of NPRACH".

[0113] table 5

[0114]

[0115] In step S402, the UE receives the PDCCH order, obtains initial coverage level information, and obtains PRACH resources corresponding to the level, including time domain positions and frequency domain positions. The frequency domain position is determined by two parameters nprach-SubcarrierOffset-r13 (PRACH start subcarrier) and nprach-NumSubcarriers-r13 (the number of PRACH carriers).

[0116] For example, obtain the initial coverage lev...

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Abstract

The invention provides a random access method and device for use in a wireless communication system and a user terminal. The method comprises the following steps: receiving instruction information transmitted by a mobile base station, wherein the instruction information is used for instructing the user terminal to initiate random access; determining PRACH (Physical Random Access Channel) resourcesfrom available resources based on a current coverage level and resource information carried in the instruction information, wherein the PRACH resources are used for transmitting a PRACH signal, and the PRACH signal is used for initiating the random access; and re-determining the PRACH resources from the available resources based on the updated coverage level and resource information under the situation that initiation of the random access on the PRACH resource fails, and transmitting the PRACH signal on the re-determined PRACH resources. Through adoption of the random access method and device, the technical problem of relatively low success rate in random access initiated by the mobile base station in the prior art is solved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a random access method and device, and a user terminal in a wireless communication system. Background technique [0002] In wireless communication systems, such as eMTC (enhanced Machine Type Communication, enhanced MTC) and NB-IoT (NarrowBand Internet of Things, narrowband Internet of Things) standard protocols, random access initiated by eNodeB (evolved Node B, evolved base station) is supported. For example, the eNodeB instructs the user equipment UE (User Equipment) to initiate a random access process by issuing a PDCCH order (PDCCH Physical Downlink Control Channel, physical downlink control channel). At this time, the eNodeB will indicate the PRACH (Physical Random Access Channel, random access channel) resource information used by the UE (Table 1 shows the PRACH information indicated by the PDCCH order). When the UE receives the instruction from the eNodeB, it sends the...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/0833H04W72/044H04W74/002H04W72/23H04W74/08H04W76/18H04W48/16H04W74/006H04W74/0883
Inventor 许靖
Owner ZTE CORP
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