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Random access method between terminal and base station in LTE system

A random access and physical random access technology, applied in access restriction, electrical components, wireless communication, etc., can solve problems such as waste of RNTI resources, complexity of interoperability between the MAC layer and the physical layer of the wireless protocol, and reduce complexity flexibility, simplified process, resource reduction effect

Active Publication Date: 2010-06-16
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0318] Aiming at the defects and deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a random access method in the LTE system to solve the above-mentioned RNTI resource waste, and the wireless protocol for the RA-RNTI to the terminal The problem of complexity caused by the interoperability between the MAC layer and the physical layer

Method used

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  • Random access method between terminal and base station in LTE system
  • Random access method between terminal and base station in LTE system
  • Random access method between terminal and base station in LTE system

Examples

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Embodiment 1

[0333] Embodiment 1 Collision-based random access procedure, FDD mode

[0334] Assume that in a certain LTE cell, the PRACH configuration index is 12, and the receiving window size is 6ms. The subframe numbers of the PRACH start subframes corresponding to such configuration indexes are 0, 2, 4, 6, and 8, respectively. Their corresponding PRIs are 0, 1, 2, 3, 4 respectively. Assuming that the terminal initiates a random access process in order to establish an RRC connection, and selects the PRACH channel with the starting subframe number 2 to send random access, then the random access process is as follows:

[0335] In step 11, the terminal selects a MAC layer protocol to send a random access preamble with an index of 37 on the PRACH channel whose subframe number is 2, that is, the PRI is 1, and sets the corresponding RA-RNTI to 1. Then notify the physical layer of the selected random access preamble, the corresponding RA-RNTI and transmission power parameters, and require th...

Embodiment 2

[0338] Embodiment 2 Collision-based random access process, TDD mode

[0339] Assume that in an LTE cell, the PRACH configuration index is 18, the receiving window size is 10ms, and the uplink / downlink configuration is 1. The four-tuples of the PRACH starting subframe corresponding to this configuration index are (0, 0, 0, 0), (0, 0, 0, 1), (0, 0, 1, 0), (0, 0, 1, 1), (1, 0, 0, 1), (1, 0, 1, 1). Their corresponding PRIs are 0, 1, 2, 3, 4, 5 respectively. Assuming that the terminal initiates a random access process in order to establish an RRC connection, and selects a PRACH channel with a PRI of 5 to send random access, then the random access process is as follows:

[0340] Step 21, the terminal sends a random access preamble with an index of 37 on the PRACH channel with a PRI of 5 selected by the MAC layer protocol, and sets the corresponding RA-RNTI to 5. Then notify the physical layer of the selected random access preamble, the corresponding RA-RNTI and transmission power...

Embodiment 3

[0343] Embodiment 3 Non-collision-based random access process, FDD mode

[0344] Assume that in a certain LTE cell, the PRACH configuration index is 12, and the receiving window size is 6ms. The subframe numbers of the PRACH start subframes corresponding to such configuration indexes are 0, 2, 4, 6, and 8, respectively. Their corresponding PRIs are 0, 1, 2, 3, 4 respectively. Assume that the terminal is in the RRC connection state, but has lost uplink synchronization. When the network has data arriving in the buffer in the downlink, it notifies the terminal to initiate a random access process through the PDCCH channel, then the random access process is as follows:

[0345] Step 30, the base station notifies the terminal through the PDCCH channel to send a random access preamble with an index of 37 on the PRACH channel with a PRI of 3;

[0346] Step 31, after the terminal receives the PDCCH signaling, the MAC layer sets the corresponding RA-RNTI to 3, and then notifies the p...

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Abstract

The invention relates to a random access method between a terminal and a base station in an LTE system, belonging to the technical field of mobile communication. In the random access method in the LTE system, a terminal sends a random access precursor on a physical random access channel and then receives a random access response message in a specified receiving time window. The random access method is characterized in that the terminal monitors a physical downlink control channel related to the random access response message; the physical downlink control channel comprises a radio network temporary mark; and the radio network temporary mark is equal to the sum of a resource index of the physical random access channel sending the random access precursor and an off-set value. The random access method decreases the resources of a reserved RA-RNTI, reduces the complexity of interoperate between an MAC layer and a physical layer and simplifies the process that the MAC layer processes the RA-RNTI.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a random access method between a terminal and a base station in an LTE system. Background technique [0002] In the process of random access in LTE Long Term Evolution (Long Term Evolution, referred to as LTE), for example, figure 1 As shown, there are mainly two steps: [0003] Step 1: The terminal sends a random access preamble on the physical random access channel (PRACH) [0004] Step 2: Then the terminal waits to receive the random access response message sent by the base station within the specified receiving time window [0005] In order to facilitate the understanding of the steps of the above two random access procedures, the following first briefly introduces the frame structure, preamble format, random access configuration of the LTE system, and frequency domain multiplexing and mapping in the LTE system. [0006] There are two types of frame structures...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W48/12
Inventor 杜忠达喻斌
Owner ZTE CORP
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