Contention-based random access method and device

A random access and random access response technology, applied in the field of communication, can solve the problems of limited PRACH coverage, achieve the effects of solving limited PRACH coverage, ensuring communication quality, and enhancing coverage

Active Publication Date: 2016-12-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in the above-mentioned prior art, and provides a contention-based random access method and equipment to solve the problem of limited PRACH coverage in the LTE system

Method used

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  • Contention-based random access method and device
  • Contention-based random access method and device
  • Contention-based random access method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] In this embodiment, a preamble sequence of length 139 is used.

[0073] The UE can randomly select the frequency domain width of one RB among the 6 RB frequency domain widths occupied by the existing PRACH channel for sending the preamble sequence, and different UEs can select different RB frequency domain positions. In this case, before the above step 201, the eNodeB can notify the UE of the PRACH sequences used for contention-based random access through the broadcast channel similarly to the prior art, and the UE randomly selects one of these PRACH sequences as the preamble sequence Sending, that is to say, the preamble sequence sent by the UE may be a sequence selected by the UE from the set of PRACH sequences used for contention-based random access. In this case, the UE only needs to send the preamble within one TTI. Correspondingly, before the above step 201, the eNodeB receives the preamble sequence with a length of 139 sent by the UE within one TTI.

[0074] Fu...

Embodiment 2

[0079] In this embodiment, a preamble sequence of length 839 is used.

[0080] Specifically, the preamble sequence can be divided into 6 parts, and only one RB position in the 6 RB widths is sent in the frequency domain, and only 1 / 6 part of the preamble sequence is sent in one TTI, and within six consecutive TTIs Different parts of the preambles are sent respectively, and the frequency domain positions of the RBs occupied by the preambles in these TTIs are the same. In the time domain, the duration of a preamble sequence is 6 times longer than the original one. Since 839 is not divisible by 6, in practical applications, 839 can be divided into 140*5+139, and the sequence length sent in the first 5 TTIs is 140, which is located in the middle of 144 available subcarriers in 1 RB in the frequency domain , leaving a guard band of 2 subcarriers on both sides; the sequence length sent in the latter TTI is 139, which is also located in the middle of 144 available subcarriers in 1 R...

Embodiment 3

[0087] In this embodiment, the number of available PRACH sequences or sequence templates in one cell is still kept at 64, and the UE selects and transmits the preamble sequence in a manner similar to the previous two embodiments, and will not be described in detail here.

[0088] The difference from the previous embodiment is that in this embodiment, the 6-bit RAPID parameter can no longer be used to indicate the preamble sequence used by the UE and the frequency domain position of the RB occupied by the preamble sequence in the RB set, but only Indicates the preamble used by the UE.

[0089] Specifically, after the eNodeB successfully detects the preamble sequence sent by the UE, it sends a random access response to the UE. In the random access response, the RAPID parameter is used to indicate the preamble sequence used by the UE, and the RA-RNTI parameter is used to indicate the preamble sequence used by the UE. The time and frequency domain location of the sequence. RA-RNT...

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Abstract

The present invention relates to the field of communication technologies, and discloses a contention-based random access method and equipment. The method includes: detecting a preamble sequence sent by a user equipment UE, and determining the time domain and frequency domain positions of the preamble sequence, wherein the The frequency domain width occupied by the preamble sequence is less than 6 resource blocks RB; a random access response is sent on the physical downlink shared channel PDSCH, wherein the random access response indicates the preamble sequence used by the UE and the preamble sequence Time domain and frequency domain positions of occupied RBs. The invention can enhance the PRACH coverage in the LTE system and ensure the communication quality of the cell edge users.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a contention-based random access method and equipment. Background technique [0002] The Long Term Evolution (LTE) technology of the third generation mobile communication (3rd Generation, 3G) has now entered the commercial stage from the research stage. In the deployment of LTE networks, in order to save costs and make network deployment more convenient, Operators hope that the LTE network can use the same site as the existing Universal Mobile Telecommunications System (UMTS) network. In order to ensure the communication quality of cell edge users, it is required that the LTE network and the UMTS network can achieve the same coverage. The LTE network divides different channels at the physical layer to carry different information. To evaluate the coverage of LTE, it is necessary to evaluate the coverage of these channels separately, identify the channels with limit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
Inventor 南方吴强范霄安刘昆鹏
Owner HUAWEI TECH CO LTD
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