Random access method and device

A random access and physical random access technology, applied in the field of communication, can solve problems such as user interference, backoff for a long time, and increased random access time

Active Publication Date: 2016-06-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for a UE that can support PRACH access and commonE-DCH access at the same time, when the commonE-DCH access fails, the UE falls back to PRACH access. When the UE uses PRACH access, the power to send the preamble (preamble) The power of the last preamble sent when the commonE-DCH accesses, the power may be very high, causing great interference to other users in the cell when the UE accesses the PRACH
[0005] On the other hand, for a UE that only supports PRACH access, the UE receives a negative acknowledgment (ie NACKINAICH, NegativeAcknowledgmentINAcquisitionIndicatorChannel) on the acquisition indicator channel during PRACH access, indicating that the U...

Method used

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Embodiment 1

[0130] An embodiment of the present invention provides a random access method, such as figure 1 As shown, the method is described below.

[0131] 101. An indication of falling back to a physical random access channel is detected when a public enhanced dedicated channel is accessed.

[0132] 102. Determine whether the transmit power parameter of the last access to send preamble on the public enhanced dedicated channel is greater than a threshold parameter.

[0133] 103. If the last transmission power parameter for sending the preamble on the public enhanced dedicated channel access is greater than a threshold parameter, send the preamble on the physical random access channel with the power corresponding to the threshold parameter.

[0134] Further, the method may further include: 104, if the transmit power parameter of the last access to send the preamble on the public enhanced dedicated channel is not greater than the threshold parameter, use the transmit power of the last ac...

Embodiment 2

[0137] An embodiment of the present invention provides a random access method. For R11, the fallback to physical random access channel (FallbacktoR99PRACH) feature is introduced. After the UE is returned to the PRACH access, when the PRACH initiates access, it does not read the information in SIB7, so that the UE cannot obtain the information contained in SIB7 in real time. Common enhanced dedicated channel interference value. The purpose of the common enhanced dedicated channel interference value is to enable the UE to calculate the transmit power for initial access of the UE according to the common enhanced dedicated channel interference value.

[0138] The UE can read the common enhanced dedicated channel interference value contained in SIB5 after powering on, and calculate the initial access transmit power during commonE-DCH access according to the common enhanced dedicated channel interference value obtained from SIB5. Since the information read in SIB5 cannot be changed...

Embodiment 3

[0157] The embodiment of the present invention provides a random access method, which is similar to the method provided in the second embodiment, the difference is that in the second embodiment, the specific method of increasing the power of the UE when accessing the commonE-DCH is not specified , but in this embodiment, when the UE accesses the commonE-DCH, the power of each increase is regular, and the value of each power increase is the same. Therefore, when the UE fails to access the commonE-DCH and falls back to PRACH access, the UE can only judge whether the number of climbs is greater than the threshold number (for example, the threshold number is m). When accessing, the preamble is generated with the transmit power corresponding to the threshold number of times, so as to avoid the UE from interfering with other users when accessing the PRACH.

[0158] Such as image 3 As shown, the method is described below.

[0159] 301. The UE sends a preamble to the network side d...

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Abstract

The invention provides a random access method and device. The method comprises the steps of detecting an instruction of returning to a physical random access channel during public enhanced dedicated channel; judging whether the transmitting power parameter of sending a precursor in public enhanced dedicated channel access the last time is greater than a threshold parameter; if the transmitting power parameter of sending a precursor in public enhanced dedicated channel access the last time is greater than a threshold parameter, sending a precursor at the physical random access channel with the power corresponding to the threshold parameter. The technical solution can reduce the interference of UE to other users in a community and increase the UE random access efficiency.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method and device. Background technique [0002] In the UMTS system, user equipment (UE, UserEquipment) has cell dedicated channel (CELL_DCH, CELL-dedicatedChannel) state, cell forward access state (CELL_FACH, CELL-ForwardAccessChannel) state, cell paging channel (CELL_PCH, CELL-PagingChannel) ) state, registration area paging (URA_PCH, UTRANRegistrationArea_PagingChannel) state, and idle (IDLE) state. UEs in idle state, CELL_FACH state, CELL_PCH state, or URA_PCH state do not maintain dedicated resources, and UEs must perform random access procedures before initiating services. [0003] Random access includes two types, namely physical random access channel (PRACH, PhysicalRandomAccessChannel) access and public enhanced dedicated channel (commonE-DCH, commonEnhancedDedicatedChannel) access. Currently, some UEs can support PRACH access and commonE...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W72/04
CPCH04W74/0833H04W72/21
Inventor 冯莉郑潇潇
Owner HUAWEI TECH CO LTD
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